2 * Copyright (C) 2004 Cluster File Systems, Inc.
4 * Copyright (C) 2009-2012 Cray, Inc.
6 * Derived from work by Eric Barton <eric@bartonsoftware.com>
7 * Author: James Shimek <jshimek@cray.com>
8 * Author: Nic Henke <nic@cray.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <linux/nmi.h>
31 /* this is useful when needed to debug wire corruption. */
33 kgnilnd_dump_blob(int level, char *prefix, void *buf, int len) {
41 "%s 0x%p: 0x%16.16llx 0x%16.16llx 0x%16.16llx 0x%16.16llx\n",
42 prefix, ptr, *(ptr), *(ptr + 1), *(ptr + 2), *(ptr + 3));
45 } else if (len >= 16) {
47 "%s 0x%p: 0x%16.16llx 0x%16.16llx\n",
48 prefix, ptr, *(ptr), *(ptr + 1));
52 CDEBUG(level, "%s 0x%p: 0x%16.16llx\n",
61 kgnilnd_dump_msg(int mask, kgn_msg_t *msg)
63 CDEBUG(mask, "0x%8.8x 0x%4.4x 0x%4.4x 0x%16.16llx"
64 " 0x%16.16llx 0x%8.8x 0x%4.4x 0x%4.4x 0x%8.8x\n",
65 msg->gnm_magic, msg->gnm_version,
66 msg->gnm_type, msg->gnm_srcnid,
67 msg->gnm_connstamp, msg->gnm_seq,
68 msg->gnm_cksum, msg->gnm_payload_cksum,
69 msg->gnm_payload_len);
73 kgnilnd_schedule_device(kgn_device_t *dev)
75 short already_live = 0;
77 /* we'll only want to wake if the scheduler thread
78 * has come around and set ready to zero */
79 already_live = cmpxchg(&dev->gnd_ready, GNILND_DEV_IDLE, GNILND_DEV_IRQ);
82 wake_up_all(&dev->gnd_waitq);
87 void kgnilnd_schedule_device_timer(unsigned long arg)
89 kgn_device_t *dev = (kgn_device_t *) arg;
91 kgnilnd_schedule_device(dev);
95 kgnilnd_device_callback(__u32 devid, __u64 arg)
98 int index = (int) arg;
100 if (index >= kgnilnd_data.kgn_ndevs) {
101 /* use _EMERG instead of an LBUG to prevent LBUG'ing in
102 * interrupt context. */
103 LCONSOLE_EMERG("callback for unknown device %d->%d\n",
108 dev = &kgnilnd_data.kgn_devices[index];
109 /* just basic sanity */
110 if (dev->gnd_id == devid) {
111 kgnilnd_schedule_device(dev);
113 LCONSOLE_EMERG("callback for bad device %d devid %d\n",
118 /* sched_intent values:
119 * < 0 : do not reschedule under any circumstances
120 * == 0: reschedule if someone marked him WANTS_SCHED
121 * > 0 : force a reschedule */
122 /* Return code 0 means it did not schedule the conn, 1
123 * means it successfully scheduled the conn.
127 kgnilnd_schedule_process_conn(kgn_conn_t *conn, int sched_intent)
131 /* move back to IDLE but save previous state.
132 * if we see WANTS_SCHED, we'll call kgnilnd_schedule_conn and
133 * let the xchg there handle any racing callers to get it
134 * onto gnd_ready_conns */
136 conn_sched = xchg(&conn->gnc_scheduled, GNILND_CONN_IDLE);
137 LASSERTF(conn_sched == GNILND_CONN_WANTS_SCHED ||
138 conn_sched == GNILND_CONN_PROCESS,
139 "conn %p after process in bad state: %d\n",
142 if (sched_intent >= 0) {
143 if ((sched_intent > 0 || (conn_sched == GNILND_CONN_WANTS_SCHED))) {
144 return kgnilnd_schedule_conn_refheld(conn, 1);
150 /* Return of 0 for conn not scheduled, 1 returned if conn was scheduled or marked
154 _kgnilnd_schedule_conn(kgn_conn_t *conn, const char *caller, int line, int refheld)
156 kgn_device_t *dev = conn->gnc_device;
160 sched = xchg(&conn->gnc_scheduled, GNILND_CONN_WANTS_SCHED);
161 /* we only care about the last person who marked want_sched since they
162 * are most likely the culprit
164 memcpy(conn->gnc_sched_caller, caller, sizeof(conn->gnc_sched_caller));
165 conn->gnc_sched_line = line;
166 /* if we are IDLE, add to list - only one guy sees IDLE and "wins"
167 * the chance to put it onto gnd_ready_conns.
168 * otherwise, leave marked as WANTS_SCHED and the thread that "owns"
169 * the conn in process_conns will take care of moving it back to
170 * SCHED when it is done processing */
172 if (sched == GNILND_CONN_IDLE) {
173 /* if the conn is already scheduled, we've already requested
174 * the scheduler thread wakeup */
176 /* Add a reference to the conn if we are not holding a reference
177 * already from the exisiting scheduler. We now use the same
178 * reference if we need to reschedule a conn while in a scheduler
181 kgnilnd_conn_addref(conn);
183 LASSERTF(list_empty(&conn->gnc_schedlist), "conn %p already sched state %d\n",
186 CDEBUG(D_INFO, "scheduling conn 0x%p caller %s:%d\n", conn, caller, line);
188 spin_lock(&dev->gnd_lock);
189 list_add_tail(&conn->gnc_schedlist, &dev->gnd_ready_conns);
190 spin_unlock(&dev->gnd_lock);
191 set_mb(conn->gnc_last_sched_ask, jiffies);
194 CDEBUG(D_INFO, "not scheduling conn 0x%p: %d caller %s:%d\n", conn, sched, caller, line);
198 /* make sure thread(s) going to process conns - but let it make
199 * separate decision from conn schedule */
200 kgnilnd_schedule_device(dev);
205 kgnilnd_schedule_dgram(kgn_device_t *dev)
209 wake = xchg(&dev->gnd_dgram_ready, GNILND_DGRAM_SCHED);
210 if (wake != GNILND_DGRAM_SCHED) {
211 wake_up(&dev->gnd_dgram_waitq);
213 CDEBUG(D_NETTRACE, "not waking: %d\n", wake);
218 kgnilnd_free_tx(kgn_tx_t *tx)
220 /* taken from kgnilnd_tx_add_state_locked */
222 LASSERTF((tx->tx_list_p == NULL &&
223 tx->tx_list_state == GNILND_TX_ALLOCD) &&
224 list_empty(&tx->tx_list),
225 "tx %p with bad state %s (list_p %p) tx_list %s\n",
226 tx, kgnilnd_tx_state2str(tx->tx_list_state), tx->tx_list_p,
227 list_empty(&tx->tx_list) ? "empty" : "not empty");
229 atomic_dec(&kgnilnd_data.kgn_ntx);
231 /* we only allocate this if we need to */
232 if (tx->tx_phys != NULL) {
233 kmem_cache_free(kgnilnd_data.kgn_tx_phys_cache, tx->tx_phys);
234 CDEBUG(D_MALLOC, "slab-freed 'tx_phys': %lu at %p.\n",
235 LNET_MAX_IOV * sizeof(gni_mem_segment_t), tx->tx_phys);
238 /* Only free the buffer if we used it */
239 if (tx->tx_buffer_copy != NULL) {
240 kgnilnd_vfree(tx->tx_buffer_copy, tx->tx_rdma_desc.length);
241 tx->tx_buffer_copy = NULL;
242 CDEBUG(D_MALLOC, "vfreed buffer2\n");
245 KGNILND_POISON(tx, 0x5a, sizeof(kgn_tx_t));
247 CDEBUG(D_MALLOC, "slab-freed 'tx': %lu at %p.\n", sizeof(*tx), tx);
248 kmem_cache_free(kgnilnd_data.kgn_tx_cache, tx);
252 kgnilnd_alloc_tx (void)
256 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_ALLOC_TX))
259 tx = kmem_cache_alloc(kgnilnd_data.kgn_tx_cache, GFP_ATOMIC);
261 CERROR("failed to allocate tx\n");
264 CDEBUG(D_MALLOC, "slab-alloced 'tx': %lu at %p.\n",
267 /* need this memset, cache alloc'd memory is not cleared */
268 memset(tx, 0, sizeof(*tx));
270 /* setup everything here to minimize time under the lock */
271 tx->tx_buftype = GNILND_BUF_NONE;
272 tx->tx_msg.gnm_type = GNILND_MSG_NONE;
273 INIT_LIST_HEAD(&tx->tx_list);
274 INIT_LIST_HEAD(&tx->tx_map_list);
275 tx->tx_list_state = GNILND_TX_ALLOCD;
277 atomic_inc(&kgnilnd_data.kgn_ntx);
282 /* csum_fold needs to be run on the return value before shipping over the wire */
283 #define _kgnilnd_cksum(seed, ptr, nob) csum_partial(ptr, nob, seed)
285 /* we don't use offset as every one is passing a buffer reference that already
286 * includes the offset into the base address -
287 * see kgnilnd_setup_virt_buffer and kgnilnd_setup_immediate_buffer */
289 kgnilnd_cksum(void *ptr, size_t nob)
293 sum = csum_fold(_kgnilnd_cksum(0, ptr, nob));
295 /* don't use magic 'no checksum' value */
299 CDEBUG(D_INFO, "cksum 0x%x for ptr 0x%p sz %zu\n",
306 kgnilnd_cksum_kiov(unsigned int nkiov, lnet_kiov_t *kiov,
307 unsigned int offset, unsigned int nob, int dump_blob)
313 unsigned int fraglen;
319 CDEBUG(D_BUFFS, "calc cksum for kiov 0x%p nkiov %u offset %u nob %u, dump %d\n",
320 kiov, nkiov, offset, nob, dump_blob);
322 /* if loops changes, please change kgnilnd_setup_phys_buffer */
324 while (offset >= kiov->kiov_len) {
325 offset -= kiov->kiov_len;
331 /* ignore nob here, if nob < (kiov_len - offset), kiov == 1 */
332 odd = (unsigned long) (kiov[0].kiov_len - offset) & 1;
334 if ((odd || *kgnilnd_tunables.kgn_vmap_cksum) && nkiov > 1) {
335 struct page **pages = kgnilnd_data.kgn_cksum_map_pages[get_cpu()];
337 LASSERTF(pages != NULL, "NULL pages for cpu %d map_pages 0x%p\n",
338 get_cpu(), kgnilnd_data.kgn_cksum_map_pages);
340 CDEBUG(D_BUFFS, "odd %d len %u offset %u nob %u\n",
341 odd, kiov[0].kiov_len, offset, nob);
343 for (i = 0; i < nkiov; i++) {
344 pages[i] = kiov[i].kiov_page;
347 addr = vmap(pages, nkiov, VM_MAP, PAGE_KERNEL);
349 CNETERR("Couldn't vmap %d frags on %d bytes to avoid odd length fragment in cksum\n",
351 /* return zero to avoid killing tx - we'll just get warning on console
352 * when remote end sees zero checksum */
355 atomic_inc(&kgnilnd_data.kgn_nvmap_cksum);
357 tmpck = _kgnilnd_cksum(0, (void *) addr + kiov[0].kiov_offset + offset, nob);
361 kgnilnd_dump_blob(D_BUFFS, "flat kiov RDMA payload",
362 (void *)addr + kiov[0].kiov_offset + offset, nob);
364 CDEBUG(D_BUFFS, "cksum 0x%x (+0x%x) for addr 0x%p+%u len %u offset %u\n",
365 cksum, tmpck, addr, kiov[0].kiov_offset, nob, offset);
369 fraglen = min(kiov->kiov_len - offset, nob);
371 /* make dang sure we don't send a bogus checksum if somehow we get
372 * an odd length fragment on anything but the last entry in a kiov -
373 * we know from kgnilnd_setup_rdma_buffer that we can't have non
374 * PAGE_SIZE pages in the middle, so if nob < PAGE_SIZE, it is the last one */
375 LASSERTF(!(fraglen&1) || (nob < PAGE_SIZE),
376 "odd fraglen %u on nkiov %d, nob %u kiov_len %u offset %u kiov 0x%p\n",
377 fraglen, nkiov, nob, kiov->kiov_len, offset, kiov);
379 addr = (void *)kmap(kiov->kiov_page) + kiov->kiov_offset + offset;
380 tmpck = _kgnilnd_cksum(cksum, addr, fraglen);
383 "cksum 0x%x (+0x%x) for page 0x%p+%u (0x%p) len %u offset %u\n",
384 cksum, tmpck, kiov->kiov_page, kiov->kiov_offset, addr,
390 kgnilnd_dump_blob(D_BUFFS, "kiov cksum", addr, fraglen);
392 kunmap(kiov->kiov_page);
399 /* iov must not run out before end of data */
400 LASSERTF(nob == 0 || nkiov > 0, "nob %u nkiov %u\n", nob, nkiov);
405 retsum = csum_fold(cksum);
407 /* don't use magic 'no checksum' value */
411 CDEBUG(D_BUFFS, "retsum 0x%x from cksum 0x%x\n", retsum, cksum);
417 kgnilnd_init_msg(kgn_msg_t *msg, int type, lnet_nid_t source)
419 msg->gnm_magic = GNILND_MSG_MAGIC;
420 msg->gnm_version = GNILND_MSG_VERSION;
421 msg->gnm_type = type;
422 msg->gnm_payload_len = 0;
423 msg->gnm_srcnid = source;
424 /* gnm_connstamp gets set when FMA is sent */
425 /* gnm_srcnid is set on creation via function argument
426 * The right interface/net and nid is passed in when the message
432 kgnilnd_new_tx_msg(int type, lnet_nid_t source)
434 kgn_tx_t *tx = kgnilnd_alloc_tx();
437 kgnilnd_init_msg(&tx->tx_msg, type, source);
439 CERROR("couldn't allocate new tx type %s!\n",
440 kgnilnd_msgtype2str(type));
447 kgnilnd_nak_rdma(kgn_conn_t *conn, int rx_type, int error, __u64 cookie, lnet_nid_t source) {
453 case GNILND_MSG_GET_REQ:
454 case GNILND_MSG_GET_DONE:
455 nak_type = GNILND_MSG_GET_NAK;
457 case GNILND_MSG_PUT_REQ:
458 case GNILND_MSG_PUT_ACK:
459 case GNILND_MSG_PUT_DONE:
460 nak_type = GNILND_MSG_PUT_NAK;
462 case GNILND_MSG_PUT_REQ_REV:
463 case GNILND_MSG_PUT_DONE_REV:
464 nak_type = GNILND_MSG_PUT_NAK_REV;
466 case GNILND_MSG_GET_REQ_REV:
467 case GNILND_MSG_GET_ACK_REV:
468 case GNILND_MSG_GET_DONE_REV:
469 nak_type = GNILND_MSG_GET_NAK_REV;
472 CERROR("invalid msg type %s (%d)\n",
473 kgnilnd_msgtype2str(rx_type), rx_type);
476 /* only allow NAK on error and truncate to zero */
477 LASSERTF(error <= 0, "error %d conn 0x%p, cookie %llu\n",
478 error, conn, cookie);
480 tx = kgnilnd_new_tx_msg(nak_type, source);
482 CNETERR("can't get TX to NAK RDMA to %s\n",
483 libcfs_nid2str(conn->gnc_peer->gnp_nid));
487 tx->tx_msg.gnm_u.completion.gncm_retval = error;
488 tx->tx_msg.gnm_u.completion.gncm_cookie = cookie;
489 kgnilnd_queue_tx(conn, tx);
493 kgnilnd_setup_immediate_buffer(kgn_tx_t *tx, unsigned int niov,
494 struct kvec *iov, lnet_kiov_t *kiov,
495 unsigned int offset, unsigned int nob)
497 kgn_msg_t *msg = &tx->tx_msg;
500 /* To help save on MDDs for short messages, we'll vmap a kiov to allow
501 * gni_smsg_send to send that as the payload */
503 LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
506 tx->tx_buffer = NULL;
507 } else if (kiov != NULL) {
509 if ((niov > 0) && unlikely(niov > (nob/PAGE_SIZE))) {
510 niov = ((nob + offset + kiov->kiov_offset + PAGE_SIZE - 1) /
514 LASSERTF(niov > 0 && niov < GNILND_MAX_IMMEDIATE/PAGE_SIZE,
515 "bad niov %d msg %p kiov %p iov %p offset %d nob%d\n",
516 niov, msg, kiov, iov, offset, nob);
518 while (offset >= kiov->kiov_len) {
519 offset -= kiov->kiov_len;
524 for (i = 0; i < niov; i++) {
525 /* We can't have a kiov_offset on anything but the first entry,
526 * otherwise we'll have a hole at the end of the mapping as we only map
528 * Also, if we have a kiov_len < PAGE_SIZE but we need to map more
529 * than kiov_len, we will also have a whole at the end of that page
530 * which isn't allowed */
531 if ((kiov[i].kiov_offset != 0 && i > 0) ||
532 (kiov[i].kiov_offset + kiov[i].kiov_len != PAGE_SIZE && i < niov - 1)) {
533 CNETERR("Can't make payload contiguous in I/O VM:"
534 "page %d, offset %u, nob %u, kiov_offset %u kiov_len %u \n",
535 i, offset, nob, kiov->kiov_offset, kiov->kiov_len);
538 tx->tx_imm_pages[i] = kiov[i].kiov_page;
541 /* hijack tx_phys for the later unmap */
543 /* tx->phyx being equal to NULL is the signal for unmap to discern between kmap and vmap */
545 tx->tx_buffer = (void *)kmap(tx->tx_imm_pages[0]) + kiov[0].kiov_offset + offset;
546 atomic_inc(&kgnilnd_data.kgn_nkmap_short);
547 GNIDBG_TX(D_NET, tx, "kmapped page for %d bytes for kiov 0x%p, buffer 0x%p",
548 nob, kiov, tx->tx_buffer);
550 tx->tx_phys = vmap(tx->tx_imm_pages, niov, VM_MAP, PAGE_KERNEL);
551 if (tx->tx_phys == NULL) {
552 CNETERR("Couldn't vmap %d frags on %d bytes\n", niov, nob);
556 atomic_inc(&kgnilnd_data.kgn_nvmap_short);
557 /* make sure we take into account the kiov offset as the start of the buffer */
558 tx->tx_buffer = (void *)tx->tx_phys + kiov[0].kiov_offset + offset;
559 GNIDBG_TX(D_NET, tx, "mapped %d pages for %d bytes from kiov 0x%p to 0x%p, buffer 0x%p",
560 niov, nob, kiov, tx->tx_phys, tx->tx_buffer);
562 tx->tx_buftype = GNILND_BUF_IMMEDIATE_KIOV;
566 /* For now this is almost identical to kgnilnd_setup_virt_buffer, but we
567 * could "flatten" the payload into a single contiguous buffer ready
568 * for sending direct over an FMA if we ever needed to. */
572 while (offset >= iov->iov_len) {
573 offset -= iov->iov_len;
579 if (nob > iov->iov_len - offset) {
580 CERROR("Can't handle multiple vaddr fragments\n");
584 tx->tx_buffer = (void *)(((unsigned long)iov->iov_base) + offset);
586 tx->tx_buftype = GNILND_BUF_IMMEDIATE;
590 /* checksum payload early - it shouldn't be changing after lnd_send */
591 if (*kgnilnd_tunables.kgn_checksum >= 2) {
592 msg->gnm_payload_cksum = kgnilnd_cksum(tx->tx_buffer, nob);
593 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM2)) {
594 msg->gnm_payload_cksum += 0xe00e;
596 if (*kgnilnd_tunables.kgn_checksum_dump > 1) {
597 kgnilnd_dump_blob(D_BUFFS, "payload checksum",
601 msg->gnm_payload_cksum = 0;
608 kgnilnd_setup_virt_buffer(kgn_tx_t *tx,
609 unsigned int niov, struct kvec *iov,
610 unsigned int offset, unsigned int nob)
615 LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
617 while (offset >= iov->iov_len) {
618 offset -= iov->iov_len;
624 if (nob > iov->iov_len - offset) {
625 CERROR("Can't handle multiple vaddr fragments\n");
629 tx->tx_buftype = GNILND_BUF_VIRT_UNMAPPED;
631 tx->tx_buffer = (void *)(((unsigned long)iov->iov_base) + offset);
636 kgnilnd_setup_phys_buffer(kgn_tx_t *tx, int nkiov, lnet_kiov_t *kiov,
637 unsigned int offset, unsigned int nob)
639 gni_mem_segment_t *phys;
641 unsigned int fraglen;
643 GNIDBG_TX(D_NET, tx, "niov %d kiov 0x%p offset %u nob %u", nkiov, kiov, offset, nob);
647 LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
649 /* only allocate this if we are going to use it */
650 tx->tx_phys = kmem_cache_alloc(kgnilnd_data.kgn_tx_phys_cache,
652 if (tx->tx_phys == NULL) {
653 CERROR("failed to allocate tx_phys\n");
658 CDEBUG(D_MALLOC, "slab-alloced 'tx->tx_phys': %lu at %p.\n",
659 LNET_MAX_IOV * sizeof(gni_mem_segment_t), tx->tx_phys);
661 /* if loops changes, please change kgnilnd_cksum_kiov
662 * and kgnilnd_setup_immediate_buffer */
664 while (offset >= kiov->kiov_len) {
665 offset -= kiov->kiov_len;
671 /* at this point, kiov points to the first page that we'll actually map
672 * now that we've seeked into the koiv for offset and dropped any
673 * leading pages that fall entirely within the offset */
674 tx->tx_buftype = GNILND_BUF_PHYS_UNMAPPED;
677 /* kiov_offset is start of 'valid' buffer, so index offset past that */
678 tx->tx_buffer = (void *)((unsigned long)(kiov->kiov_offset + offset));
681 CDEBUG(D_NET, "tx 0x%p buffer 0x%p map start kiov 0x%p+%u niov %d offset %u\n",
682 tx, tx->tx_buffer, kiov, kiov->kiov_offset, nkiov, offset);
685 fraglen = min(kiov->kiov_len - offset, nob);
687 /* We can't have a kiov_offset on anything but the first entry,
688 * otherwise we'll have a hole at the end of the mapping as we only map
689 * whole pages. Only the first page is allowed to have an offset -
690 * we'll add that into tx->tx_buffer and that will get used when we
691 * map in the segments (see kgnilnd_map_buffer).
692 * Also, if we have a kiov_len < PAGE_SIZE but we need to map more
693 * than kiov_len, we will also have a whole at the end of that page
694 * which isn't allowed */
695 if ((phys != tx->tx_phys) &&
696 ((kiov->kiov_offset != 0) ||
697 ((kiov->kiov_len < PAGE_SIZE) && (nob > kiov->kiov_len)))) {
698 CERROR("Can't make payload contiguous in I/O VM:"
699 "page %d, offset %u, nob %u, kiov_offset %u kiov_len %u \n",
700 (int)(phys - tx->tx_phys),
701 offset, nob, kiov->kiov_offset, kiov->kiov_len);
706 if ((phys - tx->tx_phys) == LNET_MAX_IOV) {
707 CERROR ("payload too big (%d)\n", (int)(phys - tx->tx_phys));
712 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PHYS_SETUP)) {
717 CDEBUG(D_BUFFS, "page 0x%p kiov_offset %u kiov_len %u nob %u "
718 "nkiov %u offset %u\n",
719 kiov->kiov_page, kiov->kiov_offset, kiov->kiov_len, nob, nkiov, offset);
721 phys->address = page_to_phys(kiov->kiov_page);
728 /* iov must not run out before end of data */
729 LASSERTF(nob == 0 || nkiov > 0, "nob %u nkiov %u\n", nob, nkiov);
733 tx->tx_phys_npages = phys - tx->tx_phys;
738 if (tx->tx_phys != NULL) {
739 kmem_cache_free(kgnilnd_data.kgn_tx_phys_cache, tx->tx_phys);
740 CDEBUG(D_MALLOC, "slab-freed 'tx_phys': %lu at %p.\n",
741 sizeof(*tx->tx_phys), tx->tx_phys);
748 kgnilnd_setup_rdma_buffer(kgn_tx_t *tx, unsigned int niov,
749 struct kvec *iov, lnet_kiov_t *kiov,
750 unsigned int offset, unsigned int nob)
754 LASSERTF((iov == NULL) != (kiov == NULL), "iov 0x%p, kiov 0x%p, tx 0x%p,"
755 " offset %d, nob %d, niov %d\n"
756 , iov, kiov, tx, offset, nob, niov);
759 rc = kgnilnd_setup_phys_buffer(tx, niov, kiov, offset, nob);
761 rc = kgnilnd_setup_virt_buffer(tx, niov, iov, offset, nob);
766 /* kgnilnd_parse_lnet_rdma()
767 * lntmsg - message passed in from lnet.
768 * niov, kiov, offset - see lnd_t in lib-types.h for descriptions.
769 * nob - actual number of bytes to in this message.
770 * put_len - It is possible for PUTs to have a different length than the
771 * length stored in lntmsg->msg_len since LNET can adjust this
772 * length based on it's buffer size and offset.
773 * lnet_try_match_md() sets the mlength that we use to do the RDMA
777 kgnilnd_parse_lnet_rdma(lnet_msg_t *lntmsg, unsigned int *niov,
778 unsigned int *offset, unsigned int *nob,
779 lnet_kiov_t **kiov, int put_len)
781 /* GETs are weird, see kgnilnd_send */
782 if (lntmsg->msg_type == LNET_MSG_GET) {
783 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0) {
786 *kiov = lntmsg->msg_md->md_iov.kiov;
788 *niov = lntmsg->msg_md->md_niov;
789 *nob = lntmsg->msg_md->md_length;
792 *kiov = lntmsg->msg_kiov;
793 *niov = lntmsg->msg_niov;
795 *offset = lntmsg->msg_offset;
800 kgnilnd_compute_rdma_cksum(kgn_tx_t *tx, int put_len)
802 unsigned int niov, offset, nob;
804 lnet_msg_t *lntmsg = tx->tx_lntmsg[0];
805 int dump_cksum = (*kgnilnd_tunables.kgn_checksum_dump > 1);
807 GNITX_ASSERTF(tx, ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE) ||
808 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE) ||
809 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV) ||
810 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) ||
811 (tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV) ||
812 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV)),
813 "bad type %s", kgnilnd_msgtype2str(tx->tx_msg.gnm_type));
815 if ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV) ||
816 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV)) {
817 tx->tx_msg.gnm_payload_cksum = 0;
820 if (*kgnilnd_tunables.kgn_checksum < 3) {
821 tx->tx_msg.gnm_payload_cksum = 0;
825 GNITX_ASSERTF(tx, lntmsg, "no LNet message!", NULL);
827 kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov,
831 tx->tx_msg.gnm_payload_cksum = kgnilnd_cksum_kiov(niov, kiov, offset, nob, dump_cksum);
833 tx->tx_msg.gnm_payload_cksum = kgnilnd_cksum(tx->tx_buffer, nob);
835 kgnilnd_dump_blob(D_BUFFS, "peer RDMA payload", tx->tx_buffer, nob);
839 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM3)) {
840 tx->tx_msg.gnm_payload_cksum += 0xd00d;
844 /* kgnilnd_verify_rdma_cksum()
845 * tx - PUT_DONE/GET_DONE matched tx.
846 * rx_cksum - received checksum to compare against.
847 * put_len - see kgnilnd_parse_lnet_rdma comments.
850 kgnilnd_verify_rdma_cksum(kgn_tx_t *tx, __u16 rx_cksum, int put_len)
854 unsigned int niov, offset, nob;
856 lnet_msg_t *lntmsg = tx->tx_lntmsg[0];
857 int dump_on_err = *kgnilnd_tunables.kgn_checksum_dump;
859 /* we can only match certain requests */
860 GNITX_ASSERTF(tx, ((tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) ||
861 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK) ||
862 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV) ||
863 (tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV) ||
864 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) ||
865 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV)),
866 "bad type %s", kgnilnd_msgtype2str(tx->tx_msg.gnm_type));
868 if ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV) ||
869 (tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV)) {
874 if (*kgnilnd_tunables.kgn_checksum >= 3) {
875 GNIDBG_MSG(D_WARNING, &tx->tx_msg,
876 "no RDMA payload checksum when enabled");
881 GNITX_ASSERTF(tx, lntmsg, "no LNet message!", NULL);
883 kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov, put_len);
886 cksum = kgnilnd_cksum_kiov(niov, kiov, offset, nob, 0);
888 cksum = kgnilnd_cksum(tx->tx_buffer, nob);
891 if (cksum != rx_cksum) {
892 GNIDBG_MSG(D_NETERROR, &tx->tx_msg,
893 "Bad RDMA payload checksum (%x expected %x); "
894 "kiov 0x%p niov %d nob %u offset %u",
895 cksum, rx_cksum, kiov, niov, nob, offset);
896 switch (dump_on_err) {
899 kgnilnd_cksum_kiov(niov, kiov, offset, nob, 1);
901 kgnilnd_dump_blob(D_BUFFS, "RDMA payload",
904 /* fall through to dump log */
906 libcfs_debug_dumplog();
912 /* kgnilnd_check_fma_rx will close conn, kill tx with error */
918 kgnilnd_mem_add_map_list(kgn_device_t *dev, kgn_tx_t *tx)
922 GNITX_ASSERTF(tx, list_empty(&tx->tx_map_list),
923 "already mapped!", NULL);
925 spin_lock(&dev->gnd_map_lock);
926 switch (tx->tx_buftype) {
928 GNIDBG_TX(D_EMERG, tx,
929 "SOFTWARE BUG: invalid mapping %d", tx->tx_buftype);
930 spin_unlock(&dev->gnd_map_lock);
934 case GNILND_BUF_PHYS_MAPPED:
935 bytes = tx->tx_phys_npages * PAGE_SIZE;
936 dev->gnd_map_nphys++;
937 dev->gnd_map_physnop += tx->tx_phys_npages;
940 case GNILND_BUF_VIRT_MAPPED:
942 dev->gnd_map_nvirt++;
943 dev->gnd_map_virtnob += tx->tx_nob;
947 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
948 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
949 atomic64_add(bytes, &dev->gnd_rdmaq_bytes_out);
950 GNIDBG_TX(D_NETTRACE, tx, "rdma ++ %d to %lld",
951 bytes, atomic64_read(&dev->gnd_rdmaq_bytes_out));
954 atomic_inc(&dev->gnd_n_mdd);
955 atomic64_add(bytes, &dev->gnd_nbytes_map);
957 /* clear retrans to prevent any SMSG goofiness as that code uses the same counter */
960 /* we only get here in the valid cases */
961 list_add_tail(&tx->tx_map_list, &dev->gnd_map_list);
962 dev->gnd_map_version++;
963 spin_unlock(&dev->gnd_map_lock);
967 kgnilnd_mem_del_map_list(kgn_device_t *dev, kgn_tx_t *tx)
971 GNITX_ASSERTF(tx, !list_empty(&tx->tx_map_list),
972 "not mapped!", NULL);
973 spin_lock(&dev->gnd_map_lock);
975 switch (tx->tx_buftype) {
977 GNIDBG_TX(D_EMERG, tx,
978 "SOFTWARE BUG: invalid mapping %d", tx->tx_buftype);
979 spin_unlock(&dev->gnd_map_lock);
983 case GNILND_BUF_PHYS_UNMAPPED:
984 bytes = tx->tx_phys_npages * PAGE_SIZE;
985 dev->gnd_map_nphys--;
986 dev->gnd_map_physnop -= tx->tx_phys_npages;
989 case GNILND_BUF_VIRT_UNMAPPED:
991 dev->gnd_map_nvirt--;
992 dev->gnd_map_virtnob -= tx->tx_nob;
996 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
997 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
998 atomic64_sub(bytes, &dev->gnd_rdmaq_bytes_out);
999 LASSERTF(atomic64_read(&dev->gnd_rdmaq_bytes_out) >= 0,
1000 "bytes_out negative! %ld\n", atomic64_read(&dev->gnd_rdmaq_bytes_out));
1001 GNIDBG_TX(D_NETTRACE, tx, "rdma -- %d to %lld",
1002 bytes, atomic64_read(&dev->gnd_rdmaq_bytes_out));
1005 atomic_dec(&dev->gnd_n_mdd);
1006 atomic64_sub(bytes, &dev->gnd_nbytes_map);
1008 /* we only get here in the valid cases */
1009 list_del_init(&tx->tx_map_list);
1010 dev->gnd_map_version++;
1011 spin_unlock(&dev->gnd_map_lock);
1015 kgnilnd_map_buffer(kgn_tx_t *tx)
1017 kgn_conn_t *conn = tx->tx_conn;
1018 kgn_device_t *dev = conn->gnc_device;
1019 __u32 flags = GNI_MEM_READWRITE;
1022 /* The kgnilnd_mem_register(_segments) Gemini Driver functions can
1023 * be called concurrently as there are internal locks that protect
1024 * any data structures or HW resources. We just need to ensure
1025 * that our concurrency doesn't result in the kgn_device_t
1026 * getting nuked while we are in here */
1028 LASSERTF(conn != NULL, "tx %p with NULL conn, someone forgot"
1029 " to set tx_conn before calling %s\n", tx, __FUNCTION__);
1031 if (unlikely(CFS_FAIL_CHECK(CFS_FAIL_GNI_MAP_TX)))
1034 if (*kgnilnd_tunables.kgn_bte_relaxed_ordering) {
1035 flags |= GNI_MEM_RELAXED_PI_ORDERING;
1038 switch (tx->tx_buftype) {
1042 case GNILND_BUF_NONE:
1043 case GNILND_BUF_IMMEDIATE:
1044 case GNILND_BUF_IMMEDIATE_KIOV:
1045 case GNILND_BUF_PHYS_MAPPED:
1046 case GNILND_BUF_VIRT_MAPPED:
1049 case GNILND_BUF_PHYS_UNMAPPED:
1050 GNITX_ASSERTF(tx, tx->tx_phys != NULL, "physical buffer not there!", NULL);
1051 rrc = kgnilnd_mem_register_segments(dev->gnd_handle,
1052 tx->tx_phys, tx->tx_phys_npages, NULL,
1053 GNI_MEM_PHYS_SEGMENTS | flags,
1055 /* could race with other uses of the map counts, but this is ok
1056 * - this needs to turn into a non-fatal error soon to allow
1057 * GART resource, etc starvation handling */
1058 if (rrc != GNI_RC_SUCCESS) {
1059 GNIDBG_TX(D_NET, tx, "Can't map %d pages: dev %d "
1060 "phys %u pp %u, virt %u nob %llu",
1061 tx->tx_phys_npages, dev->gnd_id,
1062 dev->gnd_map_nphys, dev->gnd_map_physnop,
1063 dev->gnd_map_nvirt, dev->gnd_map_virtnob);
1064 RETURN(rrc == GNI_RC_ERROR_RESOURCE ? -ENOMEM : -EINVAL);
1067 tx->tx_buftype = GNILND_BUF_PHYS_MAPPED;
1068 kgnilnd_mem_add_map_list(dev, tx);
1071 case GNILND_BUF_VIRT_UNMAPPED:
1072 rrc = kgnilnd_mem_register(dev->gnd_handle,
1073 (__u64)tx->tx_buffer, tx->tx_nob,
1074 NULL, flags, &tx->tx_map_key);
1075 if (rrc != GNI_RC_SUCCESS) {
1076 GNIDBG_TX(D_NET, tx, "Can't map %u bytes: dev %d "
1077 "phys %u pp %u, virt %u nob %llu",
1078 tx->tx_nob, dev->gnd_id,
1079 dev->gnd_map_nphys, dev->gnd_map_physnop,
1080 dev->gnd_map_nvirt, dev->gnd_map_virtnob);
1081 RETURN(rrc == GNI_RC_ERROR_RESOURCE ? -ENOMEM : -EINVAL);
1084 tx->tx_buftype = GNILND_BUF_VIRT_MAPPED;
1085 kgnilnd_mem_add_map_list(dev, tx);
1086 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
1087 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
1088 atomic64_add(tx->tx_nob, &dev->gnd_rdmaq_bytes_out);
1089 GNIDBG_TX(D_NETTRACE, tx, "rdma ++ %d to %ld\n",
1090 tx->tx_nob, atomic64_read(&dev->gnd_rdmaq_bytes_out));
1098 kgnilnd_add_purgatory_tx(kgn_tx_t *tx)
1100 kgn_conn_t *conn = tx->tx_conn;
1101 kgn_mdd_purgatory_t *gmp;
1103 LIBCFS_ALLOC(gmp, sizeof(*gmp));
1104 LASSERTF(gmp != NULL, "couldn't allocate MDD purgatory member;"
1105 " asserting to avoid data corruption\n");
1106 if (tx->tx_buffer_copy)
1107 gmp->gmp_map_key = tx->tx_buffer_copy_map_key;
1109 gmp->gmp_map_key = tx->tx_map_key;
1111 atomic_inc(&conn->gnc_device->gnd_n_mdd_held);
1113 /* ensure that we don't have a blank purgatory - indicating the
1114 * conn is not already on purgatory lists - we'd never recover these
1115 * MDD if that were the case */
1116 GNITX_ASSERTF(tx, conn->gnc_in_purgatory,
1117 "conn 0x%p->%s with NULL purgatory",
1118 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
1120 /* link 'er up! - only place we really need to lock for
1121 * concurrent access */
1122 spin_lock(&conn->gnc_list_lock);
1123 list_add_tail(&gmp->gmp_list, &conn->gnc_mdd_list);
1124 spin_unlock(&conn->gnc_list_lock);
1128 kgnilnd_unmap_buffer(kgn_tx_t *tx, int error)
1132 int hold_timeout = 0;
1134 /* code below relies on +1 relationship ... */
1135 CLASSERT(GNILND_BUF_PHYS_MAPPED == (GNILND_BUF_PHYS_UNMAPPED + 1));
1136 CLASSERT(GNILND_BUF_VIRT_MAPPED == (GNILND_BUF_VIRT_UNMAPPED + 1));
1138 switch (tx->tx_buftype) {
1142 case GNILND_BUF_NONE:
1143 case GNILND_BUF_IMMEDIATE:
1144 case GNILND_BUF_PHYS_UNMAPPED:
1145 case GNILND_BUF_VIRT_UNMAPPED:
1147 case GNILND_BUF_IMMEDIATE_KIOV:
1148 if (tx->tx_phys != NULL) {
1149 vunmap(tx->tx_phys);
1150 } else if (tx->tx_phys == NULL && tx->tx_buffer != NULL) {
1151 kunmap(tx->tx_imm_pages[0]);
1153 /* clear to prevent kgnilnd_free_tx from thinking
1154 * this is a RDMA descriptor */
1158 case GNILND_BUF_PHYS_MAPPED:
1159 case GNILND_BUF_VIRT_MAPPED:
1160 LASSERT(tx->tx_conn != NULL);
1162 dev = tx->tx_conn->gnc_device;
1164 /* only want to hold if we are closing conn without
1165 * verified peer notification - the theory is that
1166 * a TX error can be communicated in all other cases */
1167 if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED &&
1168 error != -GNILND_NOPURG &&
1169 kgnilnd_check_purgatory_conn(tx->tx_conn)) {
1170 kgnilnd_add_purgatory_tx(tx);
1172 /* The timeout we give to kgni is a deadman stop only.
1173 * we are setting high to ensure we don't have the kgni timer
1174 * fire before ours fires _and_ is handled */
1175 hold_timeout = GNILND_TIMEOUT2DEADMAN;
1177 GNIDBG_TX(D_NET, tx,
1178 "dev %p delaying MDD release for %dms key %#llx.%#llx",
1179 tx->tx_conn->gnc_device, hold_timeout,
1180 tx->tx_map_key.qword1, tx->tx_map_key.qword2);
1182 if (tx->tx_buffer_copy != NULL) {
1183 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_buffer_copy_map_key, hold_timeout);
1184 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
1185 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_map_key, 0);
1186 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
1188 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_map_key, hold_timeout);
1189 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
1193 kgnilnd_mem_del_map_list(dev, tx);
1199 kgnilnd_tx_done(kgn_tx_t *tx, int completion)
1201 lnet_msg_t *lntmsg0, *lntmsg1;
1202 int status0, status1;
1203 lnet_ni_t *ni = NULL;
1204 kgn_conn_t *conn = tx->tx_conn;
1206 LASSERT(!in_interrupt());
1208 lntmsg0 = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
1209 lntmsg1 = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
1212 !(tx->tx_state & GNILND_TX_QUIET_ERROR) &&
1213 !kgnilnd_conn_clean_errno(completion)) {
1214 GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg,
1215 "error %d on tx 0x%p->%s id %u/%d state %s age %ds",
1216 completion, tx, conn ?
1217 libcfs_nid2str(conn->gnc_peer->gnp_nid) : "<?>",
1218 tx->tx_id.txe_smsg_id, tx->tx_id.txe_idx,
1219 kgnilnd_tx_state2str(tx->tx_list_state),
1220 cfs_duration_sec((unsigned long)jiffies - tx->tx_qtime));
1223 /* The error codes determine if we hold onto the MDD */
1224 kgnilnd_unmap_buffer(tx, completion);
1226 /* we have to deliver a reply on lntmsg[1] for the GET, so make sure
1227 * we play nice with the error codes to avoid delivering a failed
1228 * REQUEST and then a REPLY event as well */
1230 /* return -EIO to lnet - it is the magic value for failed sends */
1231 if (tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
1233 status1 = completion;
1235 status0 = status1 = completion;
1238 tx->tx_buftype = GNILND_BUF_NONE;
1239 tx->tx_msg.gnm_type = GNILND_MSG_NONE;
1241 /* lnet_finalize doesn't do anything with the *ni, so ok for us to
1242 * set NULL when we are a tx without a conn */
1244 ni = conn->gnc_peer->gnp_net->gnn_ni;
1246 spin_lock(&conn->gnc_tx_lock);
1248 LASSERTF(test_and_clear_bit(tx->tx_id.txe_idx,
1249 (volatile unsigned long *)&conn->gnc_tx_bits),
1250 "conn %p tx %p bit %d already cleared\n",
1251 conn, tx, tx->tx_id.txe_idx);
1253 LASSERTF(conn->gnc_tx_ref_table[tx->tx_id.txe_idx] != NULL,
1254 "msg_id %d already NULL\n", tx->tx_id.txe_idx);
1256 conn->gnc_tx_ref_table[tx->tx_id.txe_idx] = NULL;
1257 spin_unlock(&conn->gnc_tx_lock);
1260 kgnilnd_free_tx(tx);
1262 /* finalize AFTER freeing lnet msgs */
1264 /* warning - we should hold no locks here - calling lnet_finalize
1265 * could free up lnet credits, resulting in a call chain back into
1266 * the LND via kgnilnd_send and friends */
1268 lnet_finalize(ni, lntmsg0, status0);
1270 if (lntmsg1 != NULL) {
1271 lnet_finalize(ni, lntmsg1, status1);
1276 kgnilnd_txlist_done(struct list_head *txlist, int error)
1279 int err_printed = 0;
1281 if (list_empty(txlist))
1284 list_for_each_entry_safe(tx, txn, txlist, tx_list) {
1285 /* only print the first error */
1287 tx->tx_state |= GNILND_TX_QUIET_ERROR;
1288 list_del_init(&tx->tx_list);
1289 kgnilnd_tx_done(tx, error);
1294 kgnilnd_set_tx_id(kgn_tx_t *tx, kgn_conn_t *conn)
1298 spin_lock(&conn->gnc_tx_lock);
1300 /* ID zero is NOT ALLOWED!!! */
1303 id = find_next_zero_bit((unsigned long *)&conn->gnc_tx_bits,
1304 GNILND_MAX_MSG_ID, conn->gnc_next_tx);
1305 if (id == GNILND_MAX_MSG_ID) {
1306 if (conn->gnc_next_tx != 1) {
1307 /* we only searched from next_tx to end and didn't find
1308 * one, so search again from start */
1309 conn->gnc_next_tx = 1;
1312 /* couldn't find one! */
1313 spin_unlock(&conn->gnc_tx_lock);
1317 /* bump next_tx to prevent immediate reuse */
1318 conn->gnc_next_tx = id + 1;
1320 set_bit(id, (volatile unsigned long *)&conn->gnc_tx_bits);
1321 LASSERTF(conn->gnc_tx_ref_table[id] == NULL,
1322 "tx 0x%p already at id %d\n",
1323 conn->gnc_tx_ref_table[id], id);
1325 /* delay these until we have a valid ID - prevents bad clear of the bit
1326 * in kgnilnd_tx_done */
1328 tx->tx_id.txe_cqid = conn->gnc_cqid;
1330 tx->tx_id.txe_idx = id;
1331 conn->gnc_tx_ref_table[id] = tx;
1333 /* Using jiffies to help differentiate against TX reuse - with
1334 * the usual minimum of a 250HZ clock, we wrap jiffies on the same TX
1335 * if we are sending to the same node faster than 256000/sec.
1336 * To help guard against this, we OR in the tx_seq - that is 32 bits */
1338 tx->tx_id.txe_chips = (__u32)(jiffies | atomic_read(&conn->gnc_tx_seq));
1340 GNIDBG_TX(D_NET, tx, "set cookie/id/bits", NULL);
1342 spin_unlock(&conn->gnc_tx_lock);
1347 kgnilnd_tx_should_retry(kgn_conn_t *conn, kgn_tx_t *tx)
1349 int max_retrans = *kgnilnd_tunables.kgn_max_retransmits;
1351 int log_retrans_level;
1353 /* I need kgni credits to send this. Replace tx at the head of the
1354 * fmaq and I'll get rescheduled when credits appear */
1357 conn->gnc_tx_retrans++;
1358 log_retrans = ((tx->tx_retrans < 25) || ((tx->tx_retrans % 25) == 0) ||
1359 (tx->tx_retrans > (max_retrans / 2)));
1360 log_retrans_level = tx->tx_retrans < (max_retrans / 2) ? D_NET : D_NETERROR;
1362 /* Decision time - either error, warn or just retransmit */
1364 /* we don't care about TX timeout - it could be that the network is slower
1365 * or throttled. We'll keep retranmitting - so if the network is so slow
1366 * that we fill up our mailbox, we'll keep trying to resend that msg
1367 * until we exceed the max_retrans _or_ gnc_last_rx expires, indicating
1368 * that he hasn't send us any traffic in return */
1370 if (tx->tx_retrans > max_retrans) {
1371 /* this means we are not backing off the retransmits
1372 * in a healthy manner and are likely chewing up the
1373 * CPU cycles quite badly */
1374 GNIDBG_TOMSG(D_ERROR, &tx->tx_msg,
1375 "SOFTWARE BUG: too many retransmits (%d) for tx id %x "
1377 tx->tx_retrans, tx->tx_id, conn,
1378 libcfs_nid2str(conn->gnc_peer->gnp_nid));
1380 /* yes - double errors to help debug this condition */
1381 GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg, "connection dead. "
1382 "unable to send to %s for %lu secs (%d tries)",
1383 libcfs_nid2str(tx->tx_conn->gnc_peer->gnp_nid),
1384 cfs_duration_sec(jiffies - tx->tx_cred_wait),
1387 kgnilnd_close_conn(conn, -ETIMEDOUT);
1389 /* caller should terminate */
1392 /* some reasonable throttling of the debug message */
1394 unsigned long now = jiffies;
1395 /* XXX Nic: Mystical TX debug here... */
1396 GNIDBG_SMSG_CREDS(log_retrans_level, conn);
1397 GNIDBG_TOMSG(log_retrans_level, &tx->tx_msg,
1398 "NOT_DONE on conn 0x%p->%s id %x retrans %d wait %dus"
1399 " last_msg %uus/%uus last_cq %uus/%uus",
1400 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1401 tx->tx_id, tx->tx_retrans,
1402 jiffies_to_usecs(now - tx->tx_cred_wait),
1403 jiffies_to_usecs(now - conn->gnc_last_tx),
1404 jiffies_to_usecs(now - conn->gnc_last_rx),
1405 jiffies_to_usecs(now - conn->gnc_last_tx_cq),
1406 jiffies_to_usecs(now - conn->gnc_last_rx_cq));
1408 /* caller should retry */
1413 /* caller must be holding gnd_cq_mutex and not unlock it afterwards, as we need to drop it
1414 * to avoid bad ordering with state_lock */
1417 kgnilnd_sendmsg_nolock(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
1418 spinlock_t *state_lock, kgn_tx_list_state_t state)
1420 kgn_conn_t *conn = tx->tx_conn;
1421 kgn_msg_t *msg = &tx->tx_msg;
1424 unsigned long newest_last_rx, timeout;
1427 LASSERTF((msg->gnm_type == GNILND_MSG_IMMEDIATE) ?
1428 immediatenob <= *kgnilnd_tunables.kgn_max_immediate :
1430 "msg 0x%p type %d wrong payload size %d\n",
1431 msg, msg->gnm_type, immediatenob);
1433 /* make sure we catch all the cases where we'd send on a dirty old mbox
1434 * but allow case for sending CLOSE. Since this check is within the CQ
1435 * mutex barrier and the close message is only sent through
1436 * kgnilnd_send_conn_close the last message out the door will be the
1439 if (atomic_read(&conn->gnc_peer->gnp_dirty_eps) != 0 && msg->gnm_type != GNILND_MSG_CLOSE) {
1440 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1441 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1442 /* Return -ETIME, we are closing the connection already so we dont want to
1443 * have this tx hit the wire. The tx will be killed by the calling function.
1444 * Once the EP is marked dirty the close message will be the last
1445 * thing to hit the wire */
1450 timeout = cfs_time_seconds(conn->gnc_timeout);
1452 newest_last_rx = GNILND_LASTRX(conn);
1454 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SEND_TIMEOUT)) {
1455 now = now + (GNILND_TIMEOUTRX(timeout) * 2);
1458 if (time_after_eq(now, newest_last_rx + GNILND_TIMEOUTRX(timeout))) {
1459 GNIDBG_CONN(D_NETERROR|D_CONSOLE, conn,
1460 "Cant send to %s after timeout lapse of %lu; TO %lu\n",
1461 libcfs_nid2str(conn->gnc_peer->gnp_nid),
1462 cfs_duration_sec(now - newest_last_rx),
1463 cfs_duration_sec(GNILND_TIMEOUTRX(timeout)));
1464 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1465 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1469 GNITX_ASSERTF(tx, (conn != NULL) && (tx->tx_id.txe_idx != 0), "tx id unset!", NULL);
1470 /* msg->gnm_srcnid is set when the message is initialized by whatever function is
1471 * creating the message this allows the message to contain the correct LNET NID/NET needed
1472 * instead of the one that the peer/conn uses for sending the data.
1474 msg->gnm_connstamp = conn->gnc_my_connstamp;
1475 msg->gnm_payload_len = immediatenob;
1476 msg->gnm_seq = atomic_read(&conn->gnc_tx_seq);
1478 /* always init here - kgn_checksum is a /sys module tunable
1479 * and can be flipped at any point, even between msg init and sending */
1481 if (*kgnilnd_tunables.kgn_checksum) {
1482 /* We must set here and not in kgnilnd_init_msg,
1483 * we could resend this msg many times
1484 * (NOT_DONE from gni_smsg_send below) and wouldn't pass
1485 * through init_msg again */
1486 msg->gnm_cksum = kgnilnd_cksum(msg, sizeof(kgn_msg_t));
1487 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM1)) {
1488 msg->gnm_cksum += 0xf00f;
1492 GNIDBG_TOMSG(D_NET, msg, "tx 0x%p conn 0x%p->%s sending SMSG sz %u id %x/%d [%p for %u]",
1493 tx, conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1494 sizeof(kgn_msg_t), tx->tx_id.txe_smsg_id,
1495 tx->tx_id.txe_idx, immediate, immediatenob);
1497 if (unlikely(tx->tx_state & GNILND_TX_FAIL_SMSG)) {
1498 rrc = cfs_fail_val ? cfs_fail_val : GNI_RC_NOT_DONE;
1500 rrc = kgnilnd_smsg_send(conn->gnc_ephandle,
1501 msg, sizeof(*msg), immediate,
1503 tx->tx_id.txe_smsg_id);
1507 case GNI_RC_SUCCESS:
1508 atomic_inc(&conn->gnc_tx_seq);
1509 conn->gnc_last_tx = jiffies;
1510 /* no locking here as LIVE isn't a list */
1511 kgnilnd_tx_add_state_locked(tx, NULL, conn, GNILND_TX_LIVE_FMAQ, 1);
1513 /* this needs to be checked under lock as it might be freed from a completion
1516 if (msg->gnm_type == GNILND_MSG_NOOP) {
1517 set_mb(conn->gnc_last_noop_sent, jiffies);
1520 /* serialize with seeing CQ events for completion on this, as well as
1522 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1523 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1525 atomic_inc(&conn->gnc_device->gnd_short_ntx);
1526 atomic64_add(immediatenob, &conn->gnc_device->gnd_short_txbytes);
1527 kgnilnd_peer_alive(conn->gnc_peer);
1528 GNIDBG_SMSG_CREDS(D_NET, conn);
1531 case GNI_RC_NOT_DONE:
1532 /* XXX Nic: We need to figure out how to track this
1533 * - there are bound to be good reasons for it,
1534 * but we want to know when it happens */
1535 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1536 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1537 /* We'll handle this error inline - makes the calling logic much more
1540 /* If no lock, caller doesn't want us to retry */
1541 if (state_lock == NULL) {
1545 retry_send = kgnilnd_tx_should_retry(conn, tx);
1547 /* add to head of list for the state and retries */
1548 spin_lock(state_lock);
1549 kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, state, 0);
1550 spin_unlock(state_lock);
1552 /* We only reschedule for a certain number of retries, then
1553 * we will wait for the CQ events indicating a release of SMSG
1555 if (tx->tx_retrans < (*kgnilnd_tunables.kgn_max_retransmits/4)) {
1556 kgnilnd_schedule_conn(conn);
1559 /* CQ event coming in signifies either TX completed or
1560 * RX receive. Either of these *could* free up credits
1561 * in the SMSG mbox and we should try sending again */
1562 GNIDBG_TX(D_NET, tx, "waiting for CQID %u event to resend",
1563 tx->tx_conn->gnc_cqid);
1564 /* use +ve return code to let upper layers know they
1565 * should stop looping on sends */
1572 /* handle bad retcode gracefully */
1573 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1574 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1579 /* kgnilnd_sendmsg has hard wait on gnd_cq_mutex */
1581 kgnilnd_sendmsg(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
1582 spinlock_t *state_lock, kgn_tx_list_state_t state)
1584 kgn_device_t *dev = tx->tx_conn->gnc_device;
1585 unsigned long timestamp;
1588 timestamp = jiffies;
1589 kgnilnd_gl_mutex_lock(&dev->gnd_cq_mutex);
1590 kgnilnd_conn_mutex_lock(&tx->tx_conn->gnc_smsg_mutex);
1591 /* delay in jiffies - we are really concerned only with things that
1592 * result in a schedule() or really holding this off for long times .
1593 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
1594 dev->gnd_mutex_delay += (long) jiffies - timestamp;
1596 rc = kgnilnd_sendmsg_nolock(tx, immediate, immediatenob, state_lock, state);
1602 /* returns -EAGAIN for lock miss, anything else < 0 is hard error, >=0 for success */
1604 kgnilnd_sendmsg_trylock(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
1605 spinlock_t *state_lock, kgn_tx_list_state_t state)
1607 kgn_conn_t *conn = tx->tx_conn;
1608 kgn_device_t *dev = conn->gnc_device;
1609 unsigned long timestamp;
1612 timestamp = jiffies;
1614 /* technically we are doing bad things with the read_lock on the peer_conn
1615 * table, but we shouldn't be sleeping inside here - and we don't sleep/block
1616 * for the mutex. I bet lockdep is gonna flag this one though... */
1618 /* there are a few cases where we don't want the immediate send - like
1619 * when we are in the scheduler thread and it'd harm the latency of
1620 * getting messages up to LNet */
1622 /* rmb for gnd_ready */
1624 if (conn->gnc_device->gnd_ready == GNILND_DEV_LOOP) {
1626 atomic_inc(&conn->gnc_device->gnd_fast_block);
1627 } else if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
1628 /* dont hit HW during quiesce */
1630 } else if (unlikely(atomic_read(&conn->gnc_peer->gnp_dirty_eps))) {
1631 /* dont hit HW if stale EPs and conns left to close */
1634 atomic_inc(&conn->gnc_device->gnd_fast_try);
1635 rc = kgnilnd_trylock(&conn->gnc_device->gnd_cq_mutex,
1636 &conn->gnc_smsg_mutex);
1641 /* we got the mutex and weren't blocked */
1643 /* delay in jiffies - we are really concerned only with things that
1644 * result in a schedule() or really holding this off for long times .
1645 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
1646 dev->gnd_mutex_delay += (long) jiffies - timestamp;
1648 atomic_inc(&conn->gnc_device->gnd_fast_ok);
1649 tx->tx_qtime = jiffies;
1650 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
1651 rc = kgnilnd_sendmsg_nolock(tx, tx->tx_buffer, tx->tx_nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
1652 /* _nolock unlocks the mutex for us */
1658 /* lets us know if we can push this RDMA through now */
1660 kgnilnd_auth_rdma_bytes(kgn_device_t *dev, kgn_tx_t *tx)
1664 bytes_left = atomic64_sub_return(tx->tx_nob, &dev->gnd_rdmaq_bytes_ok);
1666 if (bytes_left < 0) {
1667 atomic64_add(tx->tx_nob, &dev->gnd_rdmaq_bytes_ok);
1668 atomic_inc(&dev->gnd_rdmaq_nstalls);
1671 CDEBUG(D_NET, "no bytes to send, turning on timer for %lu\n",
1672 dev->gnd_rdmaq_deadline);
1673 mod_timer(&dev->gnd_rdmaq_timer, dev->gnd_rdmaq_deadline);
1674 /* we never del this timer - at worst it schedules us.. */
1681 /* this adds a TX to the queue pending throttling authorization before
1682 * we allow our remote peer to launch a PUT at us */
1684 kgnilnd_queue_rdma(kgn_conn_t *conn, kgn_tx_t *tx)
1688 /* we cannot go into send_mapped_tx from here as we are holding locks
1689 * and mem registration might end up allocating memory in kgni.
1690 * That said, we'll push this as far as we can into the queue process */
1691 rc = kgnilnd_auth_rdma_bytes(conn->gnc_device, tx);
1694 spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
1695 kgnilnd_tx_add_state_locked(tx, NULL, conn, GNILND_TX_RDMAQ, 0);
1696 /* lets us know how delayed RDMA is */
1697 tx->tx_qtime = jiffies;
1698 spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
1700 /* we have RDMA authorized, now it just needs a MDD and to hit the wire */
1701 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
1702 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 0);
1703 /* lets us know how delayed mapping is */
1704 tx->tx_qtime = jiffies;
1705 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
1708 /* make sure we wake up sched to run this */
1709 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
1712 /* push TX through state machine */
1714 kgnilnd_queue_tx(kgn_conn_t *conn, kgn_tx_t *tx)
1719 /* set the tx_id here, we delay it until we have an actual conn
1721 * in some cases, the tx_id is already set to provide for things
1722 * like RDMA completion cookies, etc */
1723 if (tx->tx_id.txe_idx == 0) {
1724 rc = kgnilnd_set_tx_id(tx, conn);
1726 kgnilnd_tx_done(tx, rc);
1731 CDEBUG(D_NET, "%s to conn %p for %s\n", kgnilnd_msgtype2str(tx->tx_msg.gnm_type),
1732 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
1734 /* Only let NOOPs to be sent while fail loc is set, otherwise kill the tx.
1736 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_ONLY_NOOP) && (tx->tx_msg.gnm_type != GNILND_MSG_NOOP)) {
1737 kgnilnd_tx_done(tx, rc);
1741 switch (tx->tx_msg.gnm_type) {
1742 case GNILND_MSG_PUT_ACK:
1743 case GNILND_MSG_GET_REQ:
1744 case GNILND_MSG_PUT_REQ_REV:
1745 case GNILND_MSG_GET_ACK_REV:
1746 /* hijacking time! If this messages will authorize our peer to
1747 * send his dirty little bytes in an RDMA, we need to get permission */
1748 kgnilnd_queue_rdma(conn, tx);
1750 case GNILND_MSG_IMMEDIATE:
1751 /* try to send right now, can help reduce latency */
1752 rc = kgnilnd_sendmsg_trylock(tx, tx->tx_buffer, tx->tx_nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
1755 /* it was sent, break out of switch to avoid default case of queueing */
1758 /* needs to queue to try again, so fall through to default case */
1759 case GNILND_MSG_NOOP:
1760 /* Just make sure this goes out first for this conn */
1762 /* fall through... */
1764 spin_lock(&conn->gnc_list_lock);
1765 kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, GNILND_TX_FMAQ, add_tail);
1766 tx->tx_qtime = jiffies;
1767 spin_unlock(&conn->gnc_list_lock);
1768 kgnilnd_schedule_conn(conn);
1773 kgnilnd_launch_tx(kgn_tx_t *tx, kgn_net_t *net, lnet_process_id_t *target)
1776 kgn_peer_t *new_peer = NULL;
1777 kgn_conn_t *conn = NULL;
1783 /* If I get here, I've committed to send, so I complete the tx with
1784 * failure on any problems */
1786 GNITX_ASSERTF(tx, tx->tx_conn == NULL,
1787 "tx already has connection %p", tx->tx_conn);
1789 /* do all of the peer & conn searching in one swoop - this avoids
1790 * nastiness when dropping locks and needing to maintain a sane state
1791 * in the face of stack reset or something else nuking peers & conns */
1793 /* I expect to find him, so only take a read lock */
1794 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1796 peer = kgnilnd_find_peer_locked(target->nid);
1798 conn = kgnilnd_find_conn_locked(peer);
1799 /* this could be NULL during quiesce */
1801 /* Connection exists; queue message on it */
1802 kgnilnd_queue_tx(conn, tx);
1803 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1807 /* don't create a connection if the peer is marked down */
1808 if (peer->gnp_state != GNILND_PEER_UP) {
1809 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1815 /* creating peer or conn; I'll need a write lock... */
1816 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1818 CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
1820 node_state = kgnilnd_get_node_state(LNET_NIDADDR(target->nid));
1822 /* NB - this will not block during normal operations -
1823 * the only writer of this is in the startup/shutdown path. */
1824 rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
1830 /* ignore previous peer entirely - we cycled the lock, so we
1831 * will create new peer and at worst drop it if peer is still
1833 rc = kgnilnd_create_peer_safe(&new_peer, target->nid, net, node_state);
1835 up_read(&kgnilnd_data.kgn_net_rw_sem);
1839 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1840 up_read(&kgnilnd_data.kgn_net_rw_sem);
1842 /* search for peer again now that we have the lock
1843 * if we don't find it, add our new one to the list */
1844 kgnilnd_add_peer_locked(target->nid, new_peer, &peer);
1846 /* don't create a connection if the peer is not up */
1847 if (peer->gnp_state != GNILND_PEER_UP) {
1848 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1853 conn = kgnilnd_find_or_create_conn_locked(peer);
1855 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DGRAM_DROP_TX)) {
1856 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1861 /* oh hey, found a conn now... magical */
1862 kgnilnd_queue_tx(conn, tx);
1864 /* no conn, must be trying to connect - so we queue for now */
1865 tx->tx_qtime = jiffies;
1866 kgnilnd_tx_add_state_locked(tx, peer, NULL, GNILND_TX_PEERQ, 1);
1868 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1871 kgnilnd_tx_done(tx, rc);
1876 kgnilnd_rdma(kgn_tx_t *tx, int type,
1877 kgn_rdma_desc_t *sink, unsigned int nob, __u64 cookie)
1879 kgn_conn_t *conn = tx->tx_conn;
1880 unsigned long timestamp;
1881 gni_post_type_t post_type;
1884 unsigned int desc_nob = nob;
1885 void *desc_buffer = tx->tx_buffer;
1886 gni_mem_handle_t desc_map_key = tx->tx_map_key;
1887 LASSERTF(kgnilnd_tx_mapped(tx),
1888 "unmapped tx %p\n", tx);
1889 LASSERTF(conn != NULL,
1890 "NULL conn on tx %p, naughty, naughty\n", tx);
1891 LASSERTF(nob <= sink->gnrd_nob,
1892 "nob %u > sink->gnrd_nob %d (%p)\n",
1893 nob, sink->gnrd_nob, sink);
1894 LASSERTF(nob <= tx->tx_nob,
1895 "nob %d > tx(%p)->tx_nob %d\n",
1896 nob, tx, tx->tx_nob);
1899 case GNILND_MSG_GET_DONE:
1900 case GNILND_MSG_PUT_DONE:
1901 post_type = GNI_POST_RDMA_PUT;
1903 case GNILND_MSG_GET_DONE_REV:
1904 case GNILND_MSG_PUT_DONE_REV:
1905 post_type = GNI_POST_RDMA_GET;
1908 CERROR("invalid msg type %s (%d)\n",
1909 kgnilnd_msgtype2str(type), type);
1912 if (post_type == GNI_POST_RDMA_GET) {
1913 /* Check for remote buffer / local buffer / length alignment. All must be 4 byte
1914 * aligned. If the local buffer is not aligned correctly using the copy buffer
1915 * will fix that issue. If length is misaligned copy buffer will also fix the issue, we end
1916 * up transferring extra bytes into the buffer but only copy the correct nob into the original
1917 * buffer. Remote offset correction is done through a combination of adjusting the offset,
1918 * making sure the length and addr are aligned and copying the data into the correct location
1919 * once the transfer has completed.
1921 if ((((__u64)((unsigned long)tx->tx_buffer)) & 3) ||
1922 (sink->gnrd_addr & 3) ||
1925 tx->tx_offset = ((__u64)((unsigned long)sink->gnrd_addr)) & 3;
1927 kgnilnd_admin_addref(kgnilnd_data.kgn_rev_offset);
1929 if ((nob + tx->tx_offset) & 3) {
1930 desc_nob = ((nob + tx->tx_offset) + (4 - ((nob + tx->tx_offset) & 3)));
1931 kgnilnd_admin_addref(kgnilnd_data.kgn_rev_length);
1933 desc_nob = (nob + tx->tx_offset);
1936 if (tx->tx_buffer_copy == NULL) {
1937 /* Allocate the largest copy buffer we will need, this will prevent us from overwriting data
1938 * and require at most we allocate a few extra bytes. */
1939 tx->tx_buffer_copy = kgnilnd_vzalloc(desc_nob);
1941 if (!tx->tx_buffer_copy) {
1942 /* allocation of buffer failed nak the rdma */
1943 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type, -EFAULT, cookie, tx->tx_msg.gnm_srcnid);
1944 kgnilnd_tx_done(tx, -EFAULT);
1947 kgnilnd_admin_addref(kgnilnd_data.kgn_rev_copy_buff);
1948 rc = kgnilnd_mem_register(conn->gnc_device->gnd_handle, (__u64)tx->tx_buffer_copy, desc_nob, NULL, GNI_MEM_READWRITE, &tx->tx_buffer_copy_map_key);
1949 if (rc != GNI_RC_SUCCESS) {
1950 /* Registration Failed nak rdma and kill the tx. */
1951 kgnilnd_vfree(tx->tx_buffer_copy,
1953 tx->tx_buffer_copy = NULL;
1954 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type, -EFAULT, cookie, tx->tx_msg.gnm_srcnid);
1955 kgnilnd_tx_done(tx, -EFAULT);
1959 desc_map_key = tx->tx_buffer_copy_map_key;
1960 desc_buffer = tx->tx_buffer_copy;
1964 memset(&tx->tx_rdma_desc, 0, sizeof(tx->tx_rdma_desc));
1965 tx->tx_rdma_desc.post_id = tx->tx_id.txe_cookie;
1966 tx->tx_rdma_desc.type = post_type;
1967 tx->tx_rdma_desc.cq_mode = GNI_CQMODE_GLOBAL_EVENT;
1968 tx->tx_rdma_desc.local_addr = (__u64)((unsigned long)desc_buffer);
1969 tx->tx_rdma_desc.local_mem_hndl = desc_map_key;
1970 tx->tx_rdma_desc.remote_addr = sink->gnrd_addr - tx->tx_offset;
1971 tx->tx_rdma_desc.remote_mem_hndl = sink->gnrd_key;
1972 tx->tx_rdma_desc.length = desc_nob;
1973 tx->tx_nob_rdma = nob;
1974 if (post_type == GNI_POST_RDMA_PUT && *kgnilnd_tunables.kgn_bte_put_dlvr_mode)
1975 tx->tx_rdma_desc.dlvr_mode = *kgnilnd_tunables.kgn_bte_put_dlvr_mode;
1976 if (post_type == GNI_POST_RDMA_GET && *kgnilnd_tunables.kgn_bte_get_dlvr_mode)
1977 tx->tx_rdma_desc.dlvr_mode = *kgnilnd_tunables.kgn_bte_get_dlvr_mode;
1978 /* prep final completion message */
1979 kgnilnd_init_msg(&tx->tx_msg, type, tx->tx_msg.gnm_srcnid);
1980 tx->tx_msg.gnm_u.completion.gncm_cookie = cookie;
1981 /* send actual size RDMA'd in retval */
1982 tx->tx_msg.gnm_u.completion.gncm_retval = nob;
1984 kgnilnd_compute_rdma_cksum(tx, nob);
1987 kgnilnd_queue_tx(conn, tx);
1991 /* Don't lie (CLOSE == RDMA idle) */
1992 LASSERTF(!conn->gnc_close_sent, "tx %p on conn %p after close sent %d\n",
1993 tx, conn, conn->gnc_close_sent);
1995 GNIDBG_TX(D_NET, tx, "Post RDMA type 0x%02x conn %p dlvr_mode "
1996 "0x%x cookie:%#llx",
1997 type, conn, tx->tx_rdma_desc.dlvr_mode, cookie);
1999 /* set CQ dedicated for RDMA */
2000 tx->tx_rdma_desc.src_cq_hndl = conn->gnc_device->gnd_snd_rdma_cqh;
2002 timestamp = jiffies;
2003 kgnilnd_conn_mutex_lock(&conn->gnc_rdma_mutex);
2004 kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
2005 /* delay in jiffies - we are really concerned only with things that
2006 * result in a schedule() or really holding this off for long times .
2007 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
2008 conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
2010 rrc = kgnilnd_post_rdma(conn->gnc_ephandle, &tx->tx_rdma_desc);
2012 if (rrc == GNI_RC_ERROR_RESOURCE) {
2013 kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
2014 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
2015 kgnilnd_unmap_buffer(tx, 0);
2017 if (tx->tx_buffer_copy != NULL) {
2018 kgnilnd_vfree(tx->tx_buffer_copy, desc_nob);
2019 tx->tx_buffer_copy = NULL;
2022 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2023 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn,
2025 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2026 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2030 spin_lock(&conn->gnc_list_lock);
2031 kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, GNILND_TX_LIVE_RDMAQ, 1);
2032 tx->tx_qtime = jiffies;
2033 spin_unlock(&conn->gnc_list_lock);
2034 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
2035 kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
2037 /* XXX Nic: is this a place we should handle more errors for
2038 * robustness sake */
2039 LASSERT(rrc == GNI_RC_SUCCESS);
2044 kgnilnd_alloc_rx(void)
2048 rx = kmem_cache_alloc(kgnilnd_data.kgn_rx_cache, GFP_ATOMIC);
2050 CERROR("failed to allocate rx\n");
2053 CDEBUG(D_MALLOC, "slab-alloced 'rx': %lu at %p.\n",
2056 /* no memset to zero, we'll always fill all members */
2060 /* release is to just free connection resources
2061 * we use this for the eager path after copying */
2063 kgnilnd_release_msg(kgn_conn_t *conn)
2066 unsigned long timestamp;
2068 CDEBUG(D_NET, "consuming %p\n", conn);
2070 timestamp = jiffies;
2071 kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
2072 /* delay in jiffies - we are really concerned only with things that
2073 * result in a schedule() or really holding this off for long times .
2074 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
2075 conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
2077 rrc = kgnilnd_smsg_release(conn->gnc_ephandle);
2078 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
2080 LASSERTF(rrc == GNI_RC_SUCCESS, "bad rrc %d\n", rrc);
2081 GNIDBG_SMSG_CREDS(D_NET, conn);
2087 kgnilnd_consume_rx(kgn_rx_t *rx)
2089 kgn_conn_t *conn = rx->grx_conn;
2090 kgn_msg_t *rxmsg = rx->grx_msg;
2092 /* if we are eager, free the cache alloc'd msg */
2093 if (unlikely(rx->grx_eager)) {
2094 LIBCFS_FREE(rxmsg, sizeof(*rxmsg) + *kgnilnd_tunables.kgn_max_immediate);
2095 atomic_dec(&kgnilnd_data.kgn_neager_allocs);
2097 /* release ref from eager_recv */
2098 kgnilnd_conn_decref(conn);
2100 GNIDBG_MSG(D_NET, rxmsg, "rx %p processed", rx);
2101 kgnilnd_release_msg(conn);
2104 kmem_cache_free(kgnilnd_data.kgn_rx_cache, rx);
2105 CDEBUG(D_MALLOC, "slab-freed 'rx': %lu at %p.\n",
2112 kgnilnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
2114 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
2115 int type = lntmsg->msg_type;
2116 lnet_process_id_t target = lntmsg->msg_target;
2117 int target_is_router = lntmsg->msg_target_is_router;
2118 int routing = lntmsg->msg_routing;
2119 unsigned int niov = lntmsg->msg_niov;
2120 struct kvec *iov = lntmsg->msg_iov;
2121 lnet_kiov_t *kiov = lntmsg->msg_kiov;
2122 unsigned int offset = lntmsg->msg_offset;
2123 unsigned int nob = lntmsg->msg_len;
2124 unsigned int msg_vmflush = lntmsg->msg_vmflush;
2125 kgn_net_t *net = ni->ni_data;
2129 int reverse_rdma_flag = *kgnilnd_tunables.kgn_reverse_rdma;
2131 /* NB 'private' is different depending on what we're sending.... */
2132 LASSERT(!in_interrupt());
2134 CDEBUG(D_NET, "sending msg type %d with %d bytes in %d frags to %s\n",
2135 type, nob, niov, libcfs_id2str(target));
2137 LASSERTF(nob == 0 || niov > 0,
2138 "lntmsg %p nob %d niov %d\n", lntmsg, nob, niov);
2139 LASSERTF(niov <= LNET_MAX_IOV,
2140 "lntmsg %p niov %d\n", lntmsg, niov);
2142 /* payload is either all vaddrs or all pages */
2143 LASSERTF(!(kiov != NULL && iov != NULL),
2144 "lntmsg %p kiov %p iov %p\n", lntmsg, kiov, iov);
2147 mpflag = cfs_memory_pressure_get_and_set();
2151 CERROR("lntmsg %p with unexpected type %d\n",
2156 LASSERTF(nob == 0, "lntmsg %p nob %d\n",
2164 if (routing || target_is_router)
2165 break; /* send IMMEDIATE */
2167 /* it is safe to do direct GET with out mapping buffer for RDMA as we
2168 * check the eventual sink buffer here - if small enough, remote
2169 * end is perfectly capable of returning data in short message -
2170 * The magic is that we call lnet_parse in kgnilnd_recv with rdma_req=0
2171 * for IMMEDIATE messages which will have it send a real reply instead
2172 * of doing kgnilnd_recv to have the RDMA continued */
2173 if (lntmsg->msg_md->md_length <= *kgnilnd_tunables.kgn_max_immediate)
2176 if ((reverse_rdma_flag & GNILND_REVERSE_GET) == 0)
2177 tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_REQ, ni->ni_nid);
2179 tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_REQ_REV, ni->ni_nid);
2185 /* slightly different options as we might actually have a GET with a
2186 * MD_KIOV set but a non-NULL md_iov.iov */
2187 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
2188 rc = kgnilnd_setup_rdma_buffer(tx, lntmsg->msg_md->md_niov,
2189 lntmsg->msg_md->md_iov.iov, NULL,
2190 0, lntmsg->msg_md->md_length);
2192 rc = kgnilnd_setup_rdma_buffer(tx, lntmsg->msg_md->md_niov,
2193 NULL, lntmsg->msg_md->md_iov.kiov,
2194 0, lntmsg->msg_md->md_length);
2196 CERROR("unable to setup buffer: %d\n", rc);
2197 kgnilnd_tx_done(tx, rc);
2202 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
2203 if (tx->tx_lntmsg[1] == NULL) {
2204 CERROR("Can't create reply for GET to %s\n",
2205 libcfs_nid2str(target.nid));
2206 kgnilnd_tx_done(tx, rc);
2211 tx->tx_lntmsg[0] = lntmsg;
2212 if ((reverse_rdma_flag & GNILND_REVERSE_GET) == 0)
2213 tx->tx_msg.gnm_u.get.gngm_hdr = *hdr;
2215 tx->tx_msg.gnm_u.putreq.gnprm_hdr = *hdr;
2217 /* rest of tx_msg is setup just before it is sent */
2218 kgnilnd_launch_tx(tx, net, &target);
2220 case LNET_MSG_REPLY:
2222 /* to save on MDDs, we'll handle short kiov by vmap'ing
2223 * and sending via SMSG */
2224 if (nob <= *kgnilnd_tunables.kgn_max_immediate)
2227 if ((reverse_rdma_flag & GNILND_REVERSE_PUT) == 0)
2228 tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_REQ, ni->ni_nid);
2230 tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_REQ_REV, ni->ni_nid);
2237 rc = kgnilnd_setup_rdma_buffer(tx, niov, iov, kiov, offset, nob);
2239 kgnilnd_tx_done(tx, rc);
2244 tx->tx_lntmsg[0] = lntmsg;
2245 if ((reverse_rdma_flag & GNILND_REVERSE_PUT) == 0)
2246 tx->tx_msg.gnm_u.putreq.gnprm_hdr = *hdr;
2248 tx->tx_msg.gnm_u.get.gngm_hdr = *hdr;
2250 /* rest of tx_msg is setup just before it is sent */
2251 kgnilnd_launch_tx(tx, net, &target);
2255 /* send IMMEDIATE */
2257 LASSERTF(nob <= *kgnilnd_tunables.kgn_max_immediate,
2258 "lntmsg 0x%p too large %d\n", lntmsg, nob);
2260 tx = kgnilnd_new_tx_msg(GNILND_MSG_IMMEDIATE, ni->ni_nid);
2266 rc = kgnilnd_setup_immediate_buffer(tx, niov, iov, kiov, offset, nob);
2268 kgnilnd_tx_done(tx, rc);
2272 tx->tx_msg.gnm_u.immediate.gnim_hdr = *hdr;
2273 tx->tx_lntmsg[0] = lntmsg;
2274 kgnilnd_launch_tx(tx, net, &target);
2277 /* use stored value as we could have already finalized lntmsg here from a failed launch */
2279 cfs_memory_pressure_restore(mpflag);
2284 kgnilnd_setup_rdma(lnet_ni_t *ni, kgn_rx_t *rx, lnet_msg_t *lntmsg, int mlen)
2286 kgn_conn_t *conn = rx->grx_conn;
2287 kgn_msg_t *rxmsg = rx->grx_msg;
2288 unsigned int niov = lntmsg->msg_niov;
2289 struct kvec *iov = lntmsg->msg_iov;
2290 lnet_kiov_t *kiov = lntmsg->msg_kiov;
2291 unsigned int offset = lntmsg->msg_offset;
2292 unsigned int nob = lntmsg->msg_len;
2297 switch (rxmsg->gnm_type) {
2298 case GNILND_MSG_PUT_REQ_REV:
2299 done_type = GNILND_MSG_PUT_DONE_REV;
2302 case GNILND_MSG_GET_REQ:
2303 done_type = GNILND_MSG_GET_DONE;
2306 CERROR("invalid msg type %s (%d)\n",
2307 kgnilnd_msgtype2str(rxmsg->gnm_type),
2312 tx = kgnilnd_new_tx_msg(done_type, ni->ni_nid);
2316 rc = kgnilnd_set_tx_id(tx, conn);
2320 rc = kgnilnd_setup_rdma_buffer(tx, niov, iov, kiov, offset, nob);
2324 tx->tx_lntmsg[0] = lntmsg;
2325 tx->tx_getinfo = rxmsg->gnm_u.get;
2327 /* we only queue from kgnilnd_recv - we might get called from other contexts
2328 * and we don't want to block the mutex in those cases */
2330 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2331 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
2332 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2333 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2338 kgnilnd_tx_done(tx, rc);
2339 kgnilnd_nak_rdma(conn, done_type, rc, rxmsg->gnm_u.get.gngm_cookie, ni->ni_nid);
2341 lnet_finalize(ni, lntmsg, rc);
2345 kgnilnd_eager_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg,
2348 kgn_rx_t *rx = private;
2349 kgn_conn_t *conn = rx->grx_conn;
2350 kgn_msg_t *rxmsg = rx->grx_msg;
2351 kgn_msg_t *eagermsg = NULL;
2352 kgn_peer_t *peer = NULL;
2353 kgn_conn_t *found_conn = NULL;
2355 GNIDBG_MSG(D_NET, rxmsg, "eager recv for conn %p, rxmsg %p, lntmsg %p",
2356 conn, rxmsg, lntmsg);
2358 if (rxmsg->gnm_payload_len > *kgnilnd_tunables.kgn_max_immediate) {
2359 GNIDBG_MSG(D_ERROR, rxmsg, "payload too large %d",
2360 rxmsg->gnm_payload_len);
2363 /* Grab a read lock so the connection doesnt disappear on us
2364 * while we look it up
2366 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
2368 peer = kgnilnd_find_peer_locked(rxmsg->gnm_srcnid);
2370 found_conn = kgnilnd_find_conn_locked(peer);
2373 /* Verify the connection found is the same one that the message
2374 * is supposed to be using, if it is not output an error message
2377 if (!peer || !found_conn
2378 || found_conn->gnc_peer_connstamp != rxmsg->gnm_connstamp) {
2379 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2380 CERROR("Couldnt find matching peer %p or conn %p / %p\n",
2381 peer, conn, found_conn);
2383 CERROR("Unexpected connstamp %#llx(%#llx expected)"
2384 " from %s", rxmsg->gnm_connstamp,
2385 found_conn->gnc_peer_connstamp,
2386 libcfs_nid2str(peer->gnp_nid));
2391 /* add conn ref to ensure it doesn't go away until all eager
2392 * messages processed */
2393 kgnilnd_conn_addref(conn);
2395 /* Now that we have verified the connection is valid and added a
2396 * reference we can remove the read_lock on the peer_conn_lock */
2397 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2399 /* we have no credits or buffers for this message, so copy it
2400 * somewhere for a later kgnilnd_recv */
2401 if (atomic_read(&kgnilnd_data.kgn_neager_allocs) >=
2402 *kgnilnd_tunables.kgn_eager_credits) {
2403 CERROR("Out of eager credits to %s\n",
2404 libcfs_nid2str(conn->gnc_peer->gnp_nid));
2408 atomic_inc(&kgnilnd_data.kgn_neager_allocs);
2410 LIBCFS_ALLOC(eagermsg, sizeof(*eagermsg) + *kgnilnd_tunables.kgn_max_immediate);
2411 if (eagermsg == NULL) {
2412 kgnilnd_conn_decref(conn);
2413 CERROR("couldn't allocate eager rx message for conn %p to %s\n",
2414 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
2418 /* copy msg and payload */
2419 memcpy(eagermsg, rxmsg, sizeof(*rxmsg) + rxmsg->gnm_payload_len);
2420 rx->grx_msg = eagermsg;
2423 /* stash this for lnet_finalize on cancel-on-conn-close */
2424 rx->grx_lntmsg = lntmsg;
2426 /* keep the same rx_t, it just has a new grx_msg now */
2427 *new_private = private;
2429 /* release SMSG buffer */
2430 kgnilnd_release_msg(conn);
2436 kgnilnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg,
2437 int delayed, unsigned int niov,
2438 struct kvec *iov, lnet_kiov_t *kiov,
2439 unsigned int offset, unsigned int mlen, unsigned int rlen)
2441 kgn_rx_t *rx = private;
2442 kgn_conn_t *conn = rx->grx_conn;
2443 kgn_msg_t *rxmsg = rx->grx_msg;
2449 LASSERT(!in_interrupt());
2450 LASSERTF(mlen <= rlen, "%d <= %d\n", mlen, rlen);
2451 /* Either all pages or all vaddrs */
2452 LASSERTF(!(kiov != NULL && iov != NULL), "kiov %p iov %p\n",
2455 GNIDBG_MSG(D_NET, rxmsg, "conn %p, rxmsg %p, lntmsg %p"
2456 " niov=%d kiov=%p iov=%p offset=%d mlen=%d rlen=%d",
2457 conn, rxmsg, lntmsg,
2458 niov, kiov, iov, offset, mlen, rlen);
2460 /* we need to lock here as recv can be called from any context */
2461 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
2462 if (rx->grx_eager && conn->gnc_state != GNILND_CONN_ESTABLISHED) {
2463 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2465 /* someone closed the conn after we copied this out, nuke it */
2466 kgnilnd_consume_rx(rx);
2467 lnet_finalize(ni, lntmsg, conn->gnc_error);
2470 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2472 switch (rxmsg->gnm_type) {
2474 GNIDBG_MSG(D_NETERROR, rxmsg, "conn %p, rx %p, rxmsg %p, lntmsg %p"
2475 " niov=%d kiov=%p iov=%p offset=%d mlen=%d rlen=%d",
2476 conn, rx, rxmsg, lntmsg, niov, kiov, iov, offset, mlen, rlen);
2479 case GNILND_MSG_IMMEDIATE:
2480 if (mlen > rxmsg->gnm_payload_len) {
2481 GNIDBG_MSG(D_ERROR, rxmsg,
2482 "Immediate message from %s too big: %d > %d",
2483 libcfs_nid2str(conn->gnc_peer->gnp_nid), mlen,
2484 rxmsg->gnm_payload_len);
2486 kgnilnd_consume_rx(rx);
2490 /* rxmsg[1] is a pointer to the payload, sitting in the buffer
2491 * right after the kgn_msg_t header - so just 'cute' way of saying
2492 * rxmsg + sizeof(kgn_msg_t) */
2494 /* check payload checksum if sent */
2496 if (*kgnilnd_tunables.kgn_checksum >= 2 &&
2497 !rxmsg->gnm_payload_cksum &&
2498 rxmsg->gnm_payload_len != 0)
2499 GNIDBG_MSG(D_WARNING, rxmsg, "no msg payload checksum when enabled");
2501 if (rxmsg->gnm_payload_cksum != 0) {
2502 /* gnm_payload_len set in kgnilnd_sendmsg from tx->tx_nob,
2503 * which is what is used to calculate the cksum on the TX side */
2504 pload_cksum = kgnilnd_cksum(&rxmsg[1], rxmsg->gnm_payload_len);
2506 if (rxmsg->gnm_payload_cksum != pload_cksum) {
2507 GNIDBG_MSG(D_NETERROR, rxmsg,
2508 "Bad payload checksum (%x expected %x)",
2509 pload_cksum, rxmsg->gnm_payload_cksum);
2510 switch (*kgnilnd_tunables.kgn_checksum_dump) {
2512 kgnilnd_dump_blob(D_BUFFS, "bad payload checksum",
2513 &rxmsg[1], rxmsg->gnm_payload_len);
2514 /* fall through to dump */
2516 libcfs_debug_dumplog();
2522 /* checksum problems are fatal, kill the conn */
2523 kgnilnd_consume_rx(rx);
2524 kgnilnd_close_conn(conn, rc);
2530 lnet_copy_flat2kiov(
2532 *kgnilnd_tunables.kgn_max_immediate,
2533 &rxmsg[1], 0, mlen);
2537 *kgnilnd_tunables.kgn_max_immediate,
2538 &rxmsg[1], 0, mlen);
2540 kgnilnd_consume_rx(rx);
2541 lnet_finalize(ni, lntmsg, 0);
2544 case GNILND_MSG_PUT_REQ:
2545 /* LNET wants to truncate or drop transaction, sending NAK */
2547 kgnilnd_consume_rx(rx);
2548 lnet_finalize(ni, lntmsg, 0);
2550 /* only error if lntmsg == NULL, otherwise we are just
2551 * short circuiting the rdma process of 0 bytes */
2552 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2553 lntmsg == NULL ? -ENOENT : 0,
2554 rxmsg->gnm_u.get.gngm_cookie,
2558 /* sending ACK with sink buff. info */
2559 tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_ACK, ni->ni_nid);
2561 kgnilnd_consume_rx(rx);
2565 rc = kgnilnd_set_tx_id(tx, conn);
2567 GOTO(nak_put_req, rc);
2570 rc = kgnilnd_setup_rdma_buffer(tx, niov, iov, kiov, offset, mlen);
2572 GOTO(nak_put_req, rc);
2575 tx->tx_msg.gnm_u.putack.gnpam_src_cookie =
2576 rxmsg->gnm_u.putreq.gnprm_cookie;
2577 tx->tx_msg.gnm_u.putack.gnpam_dst_cookie = tx->tx_id.txe_cookie;
2578 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_addr =
2579 (__u64)((unsigned long)tx->tx_buffer);
2580 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob = mlen;
2582 tx->tx_lntmsg[0] = lntmsg; /* finalize this on RDMA_DONE */
2583 tx->tx_qtime = jiffies;
2584 /* we only queue from kgnilnd_recv - we might get called from other contexts
2585 * and we don't want to block the mutex in those cases */
2587 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2588 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
2589 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2590 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2592 kgnilnd_consume_rx(rx);
2596 /* make sure we send an error back when the PUT fails */
2597 kgnilnd_nak_rdma(conn, rxmsg->gnm_type, rc, rxmsg->gnm_u.get.gngm_cookie, ni->ni_nid);
2598 kgnilnd_tx_done(tx, rc);
2599 kgnilnd_consume_rx(rx);
2601 /* return magic LNet network error */
2603 case GNILND_MSG_GET_REQ_REV:
2604 /* LNET wants to truncate or drop transaction, sending NAK */
2606 kgnilnd_consume_rx(rx);
2607 lnet_finalize(ni, lntmsg, 0);
2609 /* only error if lntmsg == NULL, otherwise we are just
2610 * short circuiting the rdma process of 0 bytes */
2611 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2612 lntmsg == NULL ? -ENOENT : 0,
2613 rxmsg->gnm_u.get.gngm_cookie,
2617 /* lntmsg can be null when parsing a LNET_GET */
2618 if (lntmsg != NULL) {
2619 /* sending ACK with sink buff. info */
2620 tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_ACK_REV, ni->ni_nid);
2622 kgnilnd_consume_rx(rx);
2626 rc = kgnilnd_set_tx_id(tx, conn);
2628 GOTO(nak_get_req_rev, rc);
2631 rc = kgnilnd_setup_rdma_buffer(tx, niov, iov, kiov, offset, mlen);
2633 GOTO(nak_get_req_rev, rc);
2636 tx->tx_msg.gnm_u.putack.gnpam_src_cookie =
2637 rxmsg->gnm_u.putreq.gnprm_cookie;
2638 tx->tx_msg.gnm_u.putack.gnpam_dst_cookie = tx->tx_id.txe_cookie;
2639 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_addr =
2640 (__u64)((unsigned long)tx->tx_buffer);
2641 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob = mlen;
2643 tx->tx_lntmsg[0] = lntmsg; /* finalize this on RDMA_DONE */
2645 /* we only queue from kgnilnd_recv - we might get called from other contexts
2646 * and we don't want to block the mutex in those cases */
2648 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2649 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
2650 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2651 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2654 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2656 rxmsg->gnm_u.get.gngm_cookie,
2660 kgnilnd_consume_rx(rx);
2664 /* make sure we send an error back when the GET fails */
2665 kgnilnd_nak_rdma(conn, rxmsg->gnm_type, rc, rxmsg->gnm_u.get.gngm_cookie, ni->ni_nid);
2666 kgnilnd_tx_done(tx, rc);
2667 kgnilnd_consume_rx(rx);
2669 /* return magic LNet network error */
2673 case GNILND_MSG_PUT_REQ_REV:
2674 /* LNET wants to truncate or drop transaction, sending NAK */
2676 kgnilnd_consume_rx(rx);
2677 lnet_finalize(ni, lntmsg, 0);
2679 /* only error if lntmsg == NULL, otherwise we are just
2680 * short circuiting the rdma process of 0 bytes */
2681 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2682 lntmsg == NULL ? -ENOENT : 0,
2683 rxmsg->gnm_u.get.gngm_cookie,
2688 if (lntmsg != NULL) {
2690 kgnilnd_setup_rdma(ni, rx, lntmsg, mlen);
2693 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2695 rxmsg->gnm_u.get.gngm_cookie,
2698 kgnilnd_consume_rx(rx);
2700 case GNILND_MSG_GET_REQ:
2701 if (lntmsg != NULL) {
2703 kgnilnd_setup_rdma(ni, rx, lntmsg, mlen);
2706 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2708 rxmsg->gnm_u.get.gngm_cookie,
2711 kgnilnd_consume_rx(rx);
2717 /* needs write_lock on kgn_peer_conn_lock held */
2719 kgnilnd_check_conn_timeouts_locked(kgn_conn_t *conn)
2721 unsigned long timeout, keepalive;
2722 unsigned long now = jiffies;
2723 unsigned long newest_last_rx;
2726 /* given that we found this conn hanging off a peer, it better damned
2727 * well be connected */
2728 LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
2729 "conn 0x%p->%s with bad state%s\n", conn,
2730 conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
2732 kgnilnd_conn_state2str(conn));
2734 CDEBUG(D_NET, "checking conn %p->%s timeout %d keepalive %d "
2735 "rx_diff %lu tx_diff %lu\n",
2736 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
2737 conn->gnc_timeout, GNILND_TO2KA(conn->gnc_timeout),
2738 cfs_duration_sec(now - conn->gnc_last_rx_cq),
2739 cfs_duration_sec(now - conn->gnc_last_tx));
2741 timeout = cfs_time_seconds(conn->gnc_timeout);
2742 keepalive = cfs_time_seconds(GNILND_TO2KA(conn->gnc_timeout));
2744 /* just in case our lack of RX msg processing is gumming up the works - give the
2745 * remove an extra chance */
2747 newest_last_rx = GNILND_LASTRX(conn);
2749 if (time_after_eq(now, newest_last_rx + timeout)) {
2750 uint32_t level = D_CONSOLE|D_NETERROR;
2752 if (conn->gnc_peer->gnp_state == GNILND_PEER_DOWN) {
2755 GNIDBG_CONN(level, conn,
2756 "No gnilnd traffic received from %s for %lu "
2757 "seconds, terminating connection. Is node down? ",
2758 libcfs_nid2str(conn->gnc_peer->gnp_nid),
2759 cfs_duration_sec(now - newest_last_rx));
2763 /* we don't timeout on last_tx stalls - we are going to trust the
2764 * underlying network to let us know when sends are failing.
2765 * At worst, the peer will timeout our RX stamp and drop the connection
2766 * at that point. We'll then see his CLOSE or at worst his RX
2767 * stamp stop and drop the connection on our end */
2769 if (time_after_eq(now, conn->gnc_last_tx + keepalive)) {
2770 CDEBUG(D_NET, "sending NOOP -> %s (%p idle %lu(%lu)) "
2771 "last %lu/%lu/%lu %lus/%lus/%lus\n",
2772 libcfs_nid2str(conn->gnc_peer->gnp_nid), conn,
2773 cfs_duration_sec(jiffies - conn->gnc_last_tx),
2775 conn->gnc_last_noop_want, conn->gnc_last_noop_sent,
2776 conn->gnc_last_noop_cq,
2777 cfs_duration_sec(jiffies - conn->gnc_last_noop_want),
2778 cfs_duration_sec(jiffies - conn->gnc_last_noop_sent),
2779 cfs_duration_sec(jiffies - conn->gnc_last_noop_cq));
2780 set_mb(conn->gnc_last_noop_want, jiffies);
2781 atomic_inc(&conn->gnc_reaper_noop);
2782 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
2785 tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, conn->gnc_peer->gnp_net->gnn_ni->ni_nid);
2788 kgnilnd_queue_tx(conn, tx);
2794 /* needs write_lock on kgn_peer_conn_lock held */
2796 kgnilnd_check_peer_timeouts_locked(kgn_peer_t *peer, struct list_head *todie,
2797 struct list_head *souls)
2799 unsigned long timeout;
2800 kgn_conn_t *conn, *connN = NULL;
2806 short releaseconn = 0;
2807 unsigned long first_rx = 0;
2808 int purgatory_conn_cnt = 0;
2810 CDEBUG(D_NET, "checking peer 0x%p->%s for timeouts; interval %lus\n",
2811 peer, libcfs_nid2str(peer->gnp_nid),
2812 peer->gnp_reconnect_interval);
2814 timeout = cfs_time_seconds(MAX(*kgnilnd_tunables.kgn_timeout,
2815 GNILND_MIN_TIMEOUT));
2817 conn = kgnilnd_find_conn_locked(peer);
2819 /* if there is a valid conn, check the queues for timeouts */
2820 rc = kgnilnd_check_conn_timeouts_locked(conn);
2822 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RX_CLOSE_CLOSING)) {
2823 /* simulate a RX CLOSE after the timeout but before
2824 * the scheduler thread gets it */
2825 conn->gnc_close_recvd = GNILND_CLOSE_INJECT1;
2826 conn->gnc_peer_error = -ETIMEDOUT;
2829 if (*kgnilnd_tunables.kgn_to_reconn_disable &&
2831 peer->gnp_state = GNILND_PEER_TIMED_OUT;
2832 CDEBUG(D_WARNING, "%s conn timed out, will "
2833 "reconnect upon request from peer\n",
2834 libcfs_nid2str(conn->gnc_peer->gnp_nid));
2836 /* Once we mark closed, any of the scheduler threads could
2837 * get it and move through before we hit the fail loc code */
2838 kgnilnd_close_conn_locked(conn, rc);
2840 /* first_rx is used to decide when to release a conn from purgatory.
2842 first_rx = conn->gnc_first_rx;
2846 /* now regardless of starting new conn, find tx on peer queue that
2847 * are old and smell bad - do this first so we don't trigger
2848 * reconnect on empty queue if we timeout all */
2849 list_for_each_entry_safe(tx, txN, &peer->gnp_tx_queue, tx_list) {
2850 if (time_after_eq(jiffies, tx->tx_qtime + timeout)) {
2852 LCONSOLE_INFO("could not send to %s due to connection"
2853 " setup failure after %lu seconds\n",
2854 libcfs_nid2str(peer->gnp_nid),
2855 cfs_duration_sec(jiffies - tx->tx_qtime));
2857 kgnilnd_tx_del_state_locked(tx, peer, NULL,
2859 list_add_tail(&tx->tx_list, todie);
2864 if (count || peer->gnp_connecting == GNILND_PEER_KILL) {
2865 CDEBUG(D_NET, "canceling %d tx for peer 0x%p->%s\n",
2866 count, peer, libcfs_nid2str(peer->gnp_nid));
2867 /* if we nuked all the TX, stop peer connection attempt (if there is one..) */
2868 if (list_empty(&peer->gnp_tx_queue) ||
2869 peer->gnp_connecting == GNILND_PEER_KILL) {
2870 /* we pass down todie to use a common function - but we know there are
2872 kgnilnd_cancel_peer_connect_locked(peer, todie);
2876 /* Don't reconnect if we are still trying to clear out old conns.
2877 * This prevents us sending traffic on the new mbox before ensuring we are done
2878 * with the old one */
2879 reconnect = (peer->gnp_state == GNILND_PEER_UP) &&
2880 (atomic_read(&peer->gnp_dirty_eps) == 0);
2882 /* fast reconnect after a timeout */
2883 to_reconn = !conn &&
2884 (peer->gnp_last_errno == -ETIMEDOUT) &&
2885 *kgnilnd_tunables.kgn_fast_reconn;
2887 /* if we are not connected and there are tx on the gnp_tx_queue waiting
2888 * to be sent, we'll check the reconnect interval and fire up a new
2889 * connection request */
2892 (peer->gnp_connecting == GNILND_PEER_IDLE) &&
2893 (time_after_eq(jiffies, peer->gnp_reconnect_time)) &&
2894 (!list_empty(&peer->gnp_tx_queue) || to_reconn)) {
2896 CDEBUG(D_NET, "starting connect to %s\n",
2897 libcfs_nid2str(peer->gnp_nid));
2898 LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE, "Peer was idle and we"
2899 "have a write_lock, state issue %d\n", peer->gnp_connecting);
2901 peer->gnp_connecting = GNILND_PEER_CONNECT;
2902 kgnilnd_peer_addref(peer); /* extra ref for connd */
2904 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2905 list_add_tail(&peer->gnp_connd_list,
2906 &peer->gnp_net->gnn_dev->gnd_connd_peers);
2907 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2909 kgnilnd_schedule_dgram(peer->gnp_net->gnn_dev);
2912 /* fail_loc to allow us to delay release of purgatory */
2913 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PURG_REL_DELAY))
2916 /* This check allows us to verify that the new conn is actually being used. This allows us to
2917 * pull the old conns out of purgatory if they have actually seen traffic.
2918 * We only release a conn from purgatory during stack reset, admin command, or when a peer reconnects
2921 time_after(jiffies, first_rx + cfs_time_seconds(*kgnilnd_tunables.kgn_hardware_timeout))) {
2922 CDEBUG(D_INFO, "We can release peer %s conn's from purgatory %lu\n",
2923 libcfs_nid2str(peer->gnp_nid), first_rx + cfs_time_seconds(*kgnilnd_tunables.kgn_hardware_timeout));
2927 list_for_each_entry_safe (conn, connN, &peer->gnp_conns, gnc_list) {
2928 /* check for purgatory timeouts */
2929 if (conn->gnc_in_purgatory) {
2930 /* We cannot detach this conn from purgatory if it has not been closed so we reschedule it
2931 * that way the next time we check it we can detach it from purgatory
2934 if (conn->gnc_state != GNILND_CONN_DONE) {
2935 /* Skip over conns that are currently not DONE. If they arent already scheduled
2936 * for completion something in the state machine is broken.
2941 /* We only detach a conn that is in purgatory if we have received a close message,
2942 * we have a new valid connection that has successfully received data, or an admin
2943 * command tells us we need to detach.
2946 if (conn->gnc_close_recvd || releaseconn || conn->gnc_needs_detach) {
2947 unsigned long waiting;
2949 waiting = (long) jiffies - conn->gnc_last_rx_cq;
2951 /* C.E: The remote peer is expected to close the
2952 * connection (see kgnilnd_check_conn_timeouts)
2953 * via the reaper thread and nuke out the MDD and
2954 * FMA resources after conn->gnc_timeout has expired
2955 * without an FMA RX */
2956 CDEBUG(D_NET, "Reconnected to %s in %lds or admin forced detach, dropping "
2957 " held resources\n",
2958 libcfs_nid2str(conn->gnc_peer->gnp_nid),
2959 cfs_duration_sec(waiting));
2961 kgnilnd_detach_purgatory_locked(conn, souls);
2963 purgatory_conn_cnt++;
2968 /* If we have too many connections in purgatory we could run out of
2969 * resources. Limit the number of connections to a tunable number,
2970 * clean up to the minimum all in one fell swoop... there are
2971 * situations where dvs will retry tx's and we can eat up several
2972 * hundread connection requests at once.
2974 if (purgatory_conn_cnt > *kgnilnd_tunables.kgn_max_purgatory) {
2975 list_for_each_entry_safe(conn, connN, &peer->gnp_conns,
2977 if (conn->gnc_in_purgatory &&
2978 conn->gnc_state == GNILND_CONN_DONE) {
2979 CDEBUG(D_NET, "Dropping Held resource due to"
2980 " resource limits being hit\n");
2981 kgnilnd_detach_purgatory_locked(conn, souls);
2983 if (purgatory_conn_cnt-- <
2984 *kgnilnd_tunables.kgn_max_purgatory)
2994 kgnilnd_reaper_check(int idx)
2996 struct list_head *peers = &kgnilnd_data.kgn_peers[idx];
2997 struct list_head *ctmp, *ctmpN;
2998 struct list_head geriatrics;
2999 struct list_head souls;
3001 INIT_LIST_HEAD(&geriatrics);
3002 INIT_LIST_HEAD(&souls);
3004 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
3006 list_for_each_safe(ctmp, ctmpN, peers) {
3007 kgn_peer_t *peer = NULL;
3009 /* don't timeout stuff if the network is mucked or shutting down */
3010 if (kgnilnd_check_hw_quiesce()) {
3013 peer = list_entry(ctmp, kgn_peer_t, gnp_list);
3015 kgnilnd_check_peer_timeouts_locked(peer, &geriatrics, &souls);
3018 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3020 kgnilnd_txlist_done(&geriatrics, -EHOSTUNREACH);
3021 kgnilnd_release_purgatory_list(&souls);
3025 kgnilnd_update_reaper_timeout(long timeout)
3027 LASSERT(timeout > 0);
3029 spin_lock(&kgnilnd_data.kgn_reaper_lock);
3031 if (timeout < kgnilnd_data.kgn_new_min_timeout)
3032 kgnilnd_data.kgn_new_min_timeout = timeout;
3034 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
3038 kgnilnd_reaper_poke_with_stick(unsigned long arg)
3040 wake_up(&kgnilnd_data.kgn_reaper_waitq);
3044 kgnilnd_reaper(void *arg)
3049 unsigned long next_check_time = jiffies;
3050 long current_min_timeout = MAX_SCHEDULE_TIMEOUT;
3051 struct timer_list timer;
3054 cfs_block_allsigs();
3056 /* all gnilnd threads need to run fairly urgently */
3057 set_user_nice(current, *kgnilnd_tunables.kgn_nice);
3058 spin_lock(&kgnilnd_data.kgn_reaper_lock);
3060 while (!kgnilnd_data.kgn_shutdown) {
3061 /* I wake up every 'p' seconds to check for timeouts on some
3062 * more peers. I try to check every connection 'n' times
3063 * within the global minimum of all keepalive and timeout
3064 * intervals, to ensure I attend to every connection within
3065 * (n+1)/n times its timeout intervals. */
3066 const int p = GNILND_REAPER_THREAD_WAKE;
3067 const int n = GNILND_REAPER_NCHECKS;
3069 /* to quiesce or to not quiesce, that is the question */
3070 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3071 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
3072 KGNILND_SPIN_QUIESCE;
3073 spin_lock(&kgnilnd_data.kgn_reaper_lock);
3076 /* careful with the jiffy wrap... */
3077 timeout = (long)(next_check_time - jiffies);
3080 prepare_to_wait(&kgnilnd_data.kgn_reaper_waitq, &wait,
3081 TASK_INTERRUPTIBLE);
3082 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
3083 setup_timer(&timer, kgnilnd_reaper_poke_with_stick,
3085 mod_timer(&timer, (long) jiffies + timeout);
3087 /* check flag variables before committing */
3088 if (!kgnilnd_data.kgn_shutdown &&
3089 !kgnilnd_data.kgn_quiesce_trigger) {
3090 CDEBUG(D_INFO, "schedule timeout %ld (%lu sec)\n",
3091 timeout, cfs_duration_sec(timeout));
3093 CDEBUG(D_INFO, "awake after schedule\n");
3096 del_singleshot_timer_sync(&timer);
3097 spin_lock(&kgnilnd_data.kgn_reaper_lock);
3098 finish_wait(&kgnilnd_data.kgn_reaper_waitq, &wait);
3102 /* new_min_timeout is set from the conn timeouts and keepalive
3103 * this should end up with a min timeout of
3104 * GNILND_TIMEOUT2KEEPALIVE(t) or roughly LND_TIMEOUT/2 */
3105 if (kgnilnd_data.kgn_new_min_timeout < current_min_timeout) {
3106 current_min_timeout = kgnilnd_data.kgn_new_min_timeout;
3107 CDEBUG(D_NET, "Set new min timeout %ld\n",
3108 current_min_timeout);
3111 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
3113 /* Compute how many table entries to check now so I get round
3114 * the whole table fast enough given that I do this at fixed
3115 * intervals of 'p' seconds) */
3116 chunk = *kgnilnd_tunables.kgn_peer_hash_size;
3117 if (kgnilnd_data.kgn_new_min_timeout > n * p)
3118 chunk = (chunk * n * p) /
3119 kgnilnd_data.kgn_new_min_timeout;
3122 for (i = 0; i < chunk; i++) {
3123 kgnilnd_reaper_check(hash_index);
3124 hash_index = (hash_index + 1) %
3125 *kgnilnd_tunables.kgn_peer_hash_size;
3127 next_check_time = (long) jiffies + cfs_time_seconds(p);
3128 CDEBUG(D_INFO, "next check at %lu or in %d sec\n", next_check_time, p);
3130 spin_lock(&kgnilnd_data.kgn_reaper_lock);
3133 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
3135 kgnilnd_thread_fini();
3140 kgnilnd_recv_bte_get(kgn_tx_t *tx) {
3141 unsigned niov, offset, nob;
3143 lnet_msg_t *lntmsg = tx->tx_lntmsg[0];
3144 kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov, tx->tx_nob_rdma);
3147 lnet_copy_flat2kiov(
3150 tx->tx_buffer_copy + tx->tx_offset, 0, nob);
3152 memcpy(tx->tx_buffer, tx->tx_buffer_copy + tx->tx_offset, nob);
3159 kgnilnd_check_rdma_cq(kgn_device_t *dev)
3162 gni_post_descriptor_t *desc;
3164 kgn_tx_ev_id_t ev_id;
3166 int should_retry, rc;
3167 long num_processed = 0;
3168 kgn_conn_t *conn = NULL;
3169 kgn_tx_t *tx = NULL;
3170 kgn_rdma_desc_t *rdesc;
3175 /* make sure we don't keep looping if we need to reset */
3176 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3177 return num_processed;
3179 rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
3181 /* we didn't get the mutex, so return that there is still work
3185 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DELAY_RDMA)) {
3186 /* a bit gross - but we need a good way to test for
3187 * delayed RDMA completions and the easiest way to do
3188 * that is to delay the RDMA CQ events */
3189 rrc = GNI_RC_NOT_DONE;
3191 rrc = kgnilnd_cq_get_event(dev->gnd_snd_rdma_cqh, &event_data);
3194 if (rrc == GNI_RC_NOT_DONE) {
3195 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3196 CDEBUG(D_INFO, "SEND RDMA CQ %d empty processed %ld\n",
3197 dev->gnd_id, num_processed);
3198 return num_processed;
3200 dev->gnd_sched_alive = jiffies;
3203 LASSERTF(!GNI_CQ_OVERRUN(event_data),
3204 "this is bad, somehow our credits didn't protect us"
3205 " from CQ overrun\n");
3206 LASSERTF(GNI_CQ_GET_TYPE(event_data) == GNI_CQ_EVENT_TYPE_POST,
3207 "rrc %d, GNI_CQ_GET_TYPE(%#llx) = %#llx\n", rrc,
3208 event_data, GNI_CQ_GET_TYPE(event_data));
3210 rrc = kgnilnd_get_completed(dev->gnd_snd_rdma_cqh, event_data,
3212 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3214 /* XXX Nic: Need better error handling here... */
3215 LASSERTF((rrc == GNI_RC_SUCCESS) ||
3216 (rrc == GNI_RC_TRANSACTION_ERROR),
3219 ev_id.txe_cookie = desc->post_id;
3221 kgnilnd_validate_tx_ev_id(&ev_id, &tx, &conn);
3223 if (conn == NULL || tx == NULL) {
3224 /* either conn or tx was already nuked and this is a "late"
3225 * completion, so drop it */
3229 GNITX_ASSERTF(tx, tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE ||
3230 tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE ||
3231 tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV ||
3232 tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV,
3233 "tx %p with type %d\n", tx, tx->tx_msg.gnm_type);
3235 GNIDBG_TX(D_NET, tx, "RDMA completion for %d bytes", tx->tx_nob);
3237 if (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) {
3238 lnet_set_reply_msg_len(NULL, tx->tx_lntmsg[1],
3239 tx->tx_msg.gnm_u.completion.gncm_retval);
3243 if (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV && desc->status == GNI_RC_SUCCESS) {
3244 if (tx->tx_buffer_copy != NULL)
3245 kgnilnd_recv_bte_get(tx);
3246 rc = kgnilnd_verify_rdma_cksum(tx, tx->tx_putinfo.gnpam_payload_cksum, tx->tx_nob_rdma);
3249 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV && desc->status == GNI_RC_SUCCESS) {
3250 if (tx->tx_buffer_copy != NULL)
3251 kgnilnd_recv_bte_get(tx);
3252 rc = kgnilnd_verify_rdma_cksum(tx, tx->tx_getinfo.gngm_payload_cksum, tx->tx_nob_rdma);
3255 /* remove from rdmaq */
3256 kgnilnd_conn_mutex_lock(&conn->gnc_rdma_mutex);
3257 spin_lock(&conn->gnc_list_lock);
3258 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
3259 spin_unlock(&conn->gnc_list_lock);
3260 kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
3262 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RDMA_CQ_ERROR)) {
3263 event_data = 1LL << 48;
3267 if (likely(desc->status == GNI_RC_SUCCESS) && rc == 0) {
3268 atomic_inc(&dev->gnd_rdma_ntx);
3269 atomic64_add(tx->tx_nob, &dev->gnd_rdma_txbytes);
3270 /* transaction succeeded, add into fmaq */
3271 kgnilnd_queue_tx(conn, tx);
3272 kgnilnd_peer_alive(conn->gnc_peer);
3274 /* drop ref from kgnilnd_validate_tx_ev_id */
3275 kgnilnd_admin_decref(conn->gnc_tx_in_use);
3276 kgnilnd_conn_decref(conn);
3281 /* fall through to the TRANSACTION_ERROR case */
3284 /* get stringified version for log messages */
3285 kgnilnd_cq_error_str(event_data, &err_str, 256);
3286 kgnilnd_cq_error_recoverable(event_data, &should_retry);
3288 /* make sure we are not off in the weeds with this tx */
3289 if (tx->tx_retrans >
3290 *kgnilnd_tunables.kgn_max_retransmits) {
3291 GNIDBG_TX(D_NETERROR, tx,
3292 "giving up on TX, too many retries", NULL);
3296 GNIDBG_TX(D_NETERROR, tx, "RDMA %s error (%s)",
3297 should_retry ? "transient" : "unrecoverable", err_str);
3299 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE ||
3300 tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) {
3301 rdesc = &tx->tx_putinfo.gnpam_desc;
3302 rnob = tx->tx_putinfo.gnpam_desc.gnrd_nob;
3303 rcookie = tx->tx_putinfo.gnpam_dst_cookie;
3305 rdesc = &tx->tx_getinfo.gngm_desc;
3306 rnob = tx->tx_lntmsg[0]->msg_len;
3307 rcookie = tx->tx_getinfo.gngm_cookie;
3312 tx->tx_msg.gnm_type,
3316 kgnilnd_nak_rdma(conn,
3317 tx->tx_msg.gnm_type,
3320 tx->tx_msg.gnm_srcnid);
3321 kgnilnd_tx_done(tx, -GNILND_NOPURG);
3322 kgnilnd_close_conn(conn, -ECOMM);
3325 /* drop ref from kgnilnd_validate_tx_ev_id */
3326 kgnilnd_admin_decref(conn->gnc_tx_in_use);
3327 kgnilnd_conn_decref(conn);
3332 kgnilnd_check_fma_send_cq(kgn_device_t *dev)
3336 kgn_tx_ev_id_t ev_id;
3337 kgn_tx_t *tx = NULL;
3338 kgn_conn_t *conn = NULL;
3339 int queued_fma, saw_reply, rc;
3340 long num_processed = 0;
3343 /* make sure we don't keep looping if we need to reset */
3344 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3345 return num_processed;
3348 rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
3350 /* we didn't get the mutex, so return that there is still work
3355 rrc = kgnilnd_cq_get_event(dev->gnd_snd_fma_cqh, &event_data);
3356 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3358 if (rrc == GNI_RC_NOT_DONE) {
3360 "SMSG send CQ %d not ready (data %#llx) "
3361 "processed %ld\n", dev->gnd_id, event_data,
3363 return num_processed;
3366 dev->gnd_sched_alive = jiffies;
3369 LASSERTF(!GNI_CQ_OVERRUN(event_data),
3370 "this is bad, somehow our credits didn't "
3371 "protect us from CQ overrun\n");
3372 LASSERTF(GNI_CQ_GET_TYPE(event_data) == GNI_CQ_EVENT_TYPE_SMSG,
3373 "rrc %d, GNI_CQ_GET_TYPE(%#llx) = %#llx\n", rrc,
3374 event_data, GNI_CQ_GET_TYPE(event_data));
3376 /* if SMSG couldn't handle an error, time for conn to die */
3377 if (unlikely(rrc == GNI_RC_TRANSACTION_ERROR)) {
3380 /* need to take the write_lock to ensure atomicity
3381 * on the conn state if we need to close it */
3382 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
3383 conn = kgnilnd_cqid2conn_locked(GNI_CQ_GET_INST_ID(event_data));
3385 /* Conn was destroyed? */
3387 "SMSG CQID lookup %#llx failed\n",
3388 GNI_CQ_GET_INST_ID(event_data));
3389 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3393 kgnilnd_cq_error_str(event_data, &err_str, 256);
3394 CNETERR("SMSG send error to %s: rc %d (%s)\n",
3395 libcfs_nid2str(conn->gnc_peer->gnp_nid),
3397 kgnilnd_close_conn_locked(conn, -ECOMM);
3399 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3401 /* no need to process rest of this tx -
3402 * it is getting canceled */
3406 /* fall through to GNI_RC_SUCCESS case */
3407 ev_id.txe_smsg_id = GNI_CQ_GET_MSG_ID(event_data);
3409 kgnilnd_validate_tx_ev_id(&ev_id, &tx, &conn);
3410 if (conn == NULL || tx == NULL) {
3411 /* either conn or tx was already nuked and this is a "late"
3412 * completion, so drop it */
3416 tx->tx_conn->gnc_last_tx_cq = jiffies;
3417 if (tx->tx_msg.gnm_type == GNILND_MSG_NOOP) {
3418 set_mb(conn->gnc_last_noop_cq, jiffies);
3421 /* lock tx_list_state and tx_state */
3422 kgnilnd_conn_mutex_lock(&conn->gnc_smsg_mutex);
3423 spin_lock(&tx->tx_conn->gnc_list_lock);
3425 GNITX_ASSERTF(tx, tx->tx_list_state == GNILND_TX_LIVE_FMAQ,
3426 "state not GNILND_TX_LIVE_FMAQ", NULL);
3427 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_COMPLETION,
3428 "not waiting for completion", NULL);
3430 GNIDBG_TX(D_NET, tx, "SMSG complete tx_state %x rc %d",
3433 tx->tx_state &= ~GNILND_TX_WAITING_COMPLETION;
3435 /* This will trigger other FMA sends that were
3436 * pending this completion */
3437 queued_fma = !list_empty(&tx->tx_conn->gnc_fmaq);
3439 /* we either did not expect reply or we already got it */
3440 saw_reply = !(tx->tx_state & GNILND_TX_WAITING_REPLY);
3442 spin_unlock(&tx->tx_conn->gnc_list_lock);
3443 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
3446 CDEBUG(D_NET, "scheduling conn 0x%p->%s for fmaq\n",
3448 libcfs_nid2str(conn->gnc_peer->gnp_nid));
3449 kgnilnd_schedule_conn(conn);
3452 /* If saw_reply is false as soon as gnc_list_lock is dropped the tx could be nuked
3453 * If saw_reply is true we know that the tx is safe to use as the other thread
3454 * is already finished with it.
3458 /* no longer need to track on the live_fmaq */
3459 kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
3461 if (tx->tx_state & GNILND_TX_PENDING_RDMA) {
3462 /* we already got reply & were waiting for
3463 * completion of initial send */
3464 /* to initiate RDMA transaction */
3465 GNIDBG_TX(D_NET, tx,
3466 "Pending RDMA 0x%p type 0x%02x",
3467 tx->tx_msg.gnm_type);
3468 tx->tx_state &= ~GNILND_TX_PENDING_RDMA;
3469 rc = kgnilnd_send_mapped_tx(tx, 0);
3470 GNITX_ASSERTF(tx, rc == 0, "RDMA send failed: %d\n", rc);
3472 /* we are done with this tx */
3473 GNIDBG_TX(D_NET, tx,
3474 "Done with tx type 0x%02x",
3475 tx->tx_msg.gnm_type);
3476 kgnilnd_tx_done(tx, tx->tx_rc);
3480 /* drop ref from kgnilnd_validate_tx_ev_id */
3481 kgnilnd_admin_decref(conn->gnc_tx_in_use);
3482 kgnilnd_conn_decref(conn);
3484 /* if we are waiting for a REPLY, we'll handle the tx then */
3485 } /* end for loop */
3489 kgnilnd_check_fma_rcv_cq(kgn_device_t *dev)
3494 long num_processed = 0;
3495 struct list_head *conns;
3496 struct list_head *tmp;
3500 /* make sure we don't keep looping if we need to reset */
3501 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3502 return num_processed;
3505 rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
3507 /* we didn't get the mutex, so return that there is still work
3511 rrc = kgnilnd_cq_get_event(dev->gnd_rcv_fma_cqh, &event_data);
3512 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3514 if (rrc == GNI_RC_NOT_DONE) {
3515 CDEBUG(D_INFO, "SMSG RX CQ %d empty data %#llx "
3517 dev->gnd_id, event_data, num_processed);
3518 return num_processed;
3520 dev->gnd_sched_alive = jiffies;
3523 /* this is the only CQ that can really handle transient
3525 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CQ_GET_EVENT)) {
3526 rrc = cfs_fail_val ? cfs_fail_val
3527 : GNI_RC_ERROR_RESOURCE;
3528 if (rrc == GNI_RC_ERROR_RESOURCE) {
3529 /* set overrun too */
3530 event_data |= (1UL << 63);
3531 LASSERTF(GNI_CQ_OVERRUN(event_data),
3532 "(1UL << 63) is no longer the bit to"
3533 "set to indicate CQ_OVERRUN\n");
3536 /* sender should get error event too and take care
3537 of failed transaction by re-transmitting */
3538 if (rrc == GNI_RC_TRANSACTION_ERROR) {
3539 CDEBUG(D_NET, "SMSG RX CQ error %#llx\n", event_data);
3543 if (likely(!GNI_CQ_OVERRUN(event_data))) {
3544 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
3545 conn = kgnilnd_cqid2conn_locked(
3546 GNI_CQ_GET_INST_ID(event_data));
3548 CDEBUG(D_NET, "SMSG RX CQID lookup %llu "
3549 "failed, dropping event %#llx\n",
3550 GNI_CQ_GET_INST_ID(event_data),
3553 CDEBUG(D_NET, "SMSG RX: CQID %llu "
3555 GNI_CQ_GET_INST_ID(event_data),
3556 conn, conn->gnc_peer ?
3557 libcfs_nid2str(conn->gnc_peer->gnp_nid) :
3560 conn->gnc_last_rx_cq = jiffies;
3562 /* stash first rx so we can clear out purgatory.
3564 if (conn->gnc_first_rx == 0) {
3565 conn->gnc_first_rx = jiffies;
3567 kgnilnd_peer_alive(conn->gnc_peer);
3568 kgnilnd_schedule_conn(conn);
3570 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3574 /* FMA CQ has overflowed: check ALL conns */
3575 CNETERR("SMSG RX CQ overflow: scheduling ALL "
3576 "conns on device %d\n", dev->gnd_id);
3578 for (rc = 0; rc < *kgnilnd_tunables.kgn_peer_hash_size; rc++) {
3580 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
3581 conns = &kgnilnd_data.kgn_conns[rc];
3583 list_for_each(tmp, conns) {
3584 conn = list_entry(tmp, kgn_conn_t,
3587 if (conn->gnc_device == dev) {
3588 kgnilnd_schedule_conn(conn);
3589 conn->gnc_last_rx_cq = jiffies;
3593 /* don't block write lockers for too long... */
3594 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3599 /* try_map_if_full should only be used when processing TX from list of
3600 * backlog TX waiting on mappings to free up
3603 * try_map_if_full = 0: 0 (sent or queued), (-|+)errno failure of kgnilnd_sendmsg
3604 * try_map_if_full = 1: 0 (sent), -ENOMEM for caller to requeue, (-|+)errno failure of kgnilnd_sendmsg */
3607 kgnilnd_send_mapped_tx(kgn_tx_t *tx, int try_map_if_full)
3609 /* slight bit of race if multiple people calling, but at worst we'll have
3610 * order altered just a bit... which would not be determenistic anyways */
3611 int rc = atomic_read(&tx->tx_conn->gnc_device->gnd_nq_map);
3613 GNIDBG_TX(D_NET, tx, "try %d nq_map %d", try_map_if_full, rc);
3615 /* We know that we have a GART reservation that should guarantee forward progress.
3616 * This means we don't need to take any extraordinary efforts if we are failing
3617 * mappings here - even if we are holding a very small number of these. */
3619 if (try_map_if_full || (rc == 0)) {
3620 rc = kgnilnd_map_buffer(tx);
3623 /* rc should be 0 if we mapped successfully here, if non-zero
3624 * we are queueing */
3626 /* if try_map_if_full set, they handle requeuing */
3627 if (unlikely(try_map_if_full)) {
3630 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
3631 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
3632 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
3633 /* make sure we wake up sched to run this */
3634 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
3635 /* return 0 as this is now queued for later sending */
3640 switch (tx->tx_msg.gnm_type) {
3644 /* GET_REQ and PUT_ACK are outbound messages sending our mapping key to
3645 * remote node where the RDMA will be started
3646 * Special case -EAGAIN logic - this should just queued as if the mapping couldn't
3647 * be satisified. The rest of the errors are "hard" errors that require
3648 * upper layers to handle themselves.
3649 * If kgnilnd_post_rdma returns a resource error, kgnilnd_rdma will put
3650 * the tx back on the TX_MAPQ. When this tx is pulled back off the MAPQ,
3651 * it's gnm_type will now be GNILND_MSG_PUT_DONE or
3652 * GNILND_MSG_GET_DONE_REV.
3654 case GNILND_MSG_GET_REQ:
3655 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_key = tx->tx_map_key;
3656 tx->tx_msg.gnm_u.get.gngm_cookie = tx->tx_id.txe_cookie;
3657 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_addr = (__u64)((unsigned long)tx->tx_buffer);
3658 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_nob = tx->tx_nob;
3659 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3660 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GET_REQ_AGAIN)) {
3661 tx->tx_state |= GNILND_TX_FAIL_SMSG;
3663 /* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
3664 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3666 case GNILND_MSG_PUT_ACK:
3667 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_key = tx->tx_map_key;
3668 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3669 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PUT_ACK_AGAIN)) {
3670 tx->tx_state |= GNILND_TX_FAIL_SMSG;
3672 /* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
3673 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3676 /* PUT_REQ and GET_DONE are where we do the actual RDMA */
3677 case GNILND_MSG_PUT_DONE:
3678 case GNILND_MSG_PUT_REQ:
3679 rc = kgnilnd_rdma(tx, GNILND_MSG_PUT_DONE,
3680 &tx->tx_putinfo.gnpam_desc,
3681 tx->tx_putinfo.gnpam_desc.gnrd_nob,
3682 tx->tx_putinfo.gnpam_dst_cookie);
3683 RETURN(try_map_if_full ? rc : 0);
3685 case GNILND_MSG_GET_DONE:
3686 rc = kgnilnd_rdma(tx, GNILND_MSG_GET_DONE,
3687 &tx->tx_getinfo.gngm_desc,
3688 tx->tx_lntmsg[0]->msg_len,
3689 tx->tx_getinfo.gngm_cookie);
3690 RETURN(try_map_if_full ? rc : 0);
3692 case GNILND_MSG_PUT_REQ_REV:
3693 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_key = tx->tx_map_key;
3694 tx->tx_msg.gnm_u.get.gngm_cookie = tx->tx_id.txe_cookie;
3695 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_addr = (__u64)((unsigned long)tx->tx_buffer);
3696 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_nob = tx->tx_nob;
3697 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3698 kgnilnd_compute_rdma_cksum(tx, tx->tx_nob);
3699 tx->tx_msg.gnm_u.get.gngm_payload_cksum = tx->tx_msg.gnm_payload_cksum;
3701 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3703 case GNILND_MSG_PUT_DONE_REV:
3704 rc = kgnilnd_rdma(tx, GNILND_MSG_PUT_DONE_REV,
3705 &tx->tx_getinfo.gngm_desc,
3707 tx->tx_getinfo.gngm_cookie);
3708 RETURN(try_map_if_full ? rc : 0);
3710 case GNILND_MSG_GET_ACK_REV:
3711 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_key = tx->tx_map_key;
3712 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3713 /* LNET_GETS are a special case for parse */
3714 kgnilnd_compute_rdma_cksum(tx, tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob);
3715 tx->tx_msg.gnm_u.putack.gnpam_payload_cksum = tx->tx_msg.gnm_payload_cksum;
3717 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PUT_ACK_AGAIN))
3718 tx->tx_state |= GNILND_TX_FAIL_SMSG;
3720 /* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
3721 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3723 case GNILND_MSG_GET_DONE_REV:
3724 case GNILND_MSG_GET_REQ_REV:
3725 rc = kgnilnd_rdma(tx, GNILND_MSG_GET_DONE_REV,
3726 &tx->tx_putinfo.gnpam_desc,
3727 tx->tx_putinfo.gnpam_desc.gnrd_nob,
3728 tx->tx_putinfo.gnpam_dst_cookie);
3729 RETURN(try_map_if_full ? rc : 0);
3737 kgnilnd_process_fmaq(kgn_conn_t *conn)
3740 kgn_tx_t *tx = NULL;
3741 void *buffer = NULL;
3742 unsigned int nob = 0;
3745 /* NB 1. kgnilnd_sendmsg() may fail if I'm out of credits right now.
3746 * However I will be rescheduled by an FMA completion event
3747 * when I eventually get some.
3748 * NB 2. Sampling gnc_state here races with setting it elsewhere.
3749 * But it doesn't matter if I try to send a "real" message just
3750 * as I start closing because I'll get scheduled to send the
3753 /* Short circuit if the ep_handle is null we cant send anyway. */
3754 if (conn->gnc_ephandle == NULL)
3757 LASSERTF(!conn->gnc_close_sent, "Conn %p close was sent\n", conn);
3759 spin_lock(&conn->gnc_list_lock);
3761 if (list_empty(&conn->gnc_fmaq)) {
3762 int keepalive = GNILND_TO2KA(conn->gnc_timeout);
3764 spin_unlock(&conn->gnc_list_lock);
3766 if (time_after_eq(jiffies, conn->gnc_last_tx + cfs_time_seconds(keepalive))) {
3767 CDEBUG(D_NET, "sending NOOP -> %s (%p idle %lu(%d)) "
3768 "last %lu/%lu/%lu %lus/%lus/%lus\n",
3769 libcfs_nid2str(conn->gnc_peer->gnp_nid), conn,
3770 cfs_duration_sec(jiffies - conn->gnc_last_tx),
3772 conn->gnc_last_noop_want, conn->gnc_last_noop_sent,
3773 conn->gnc_last_noop_cq,
3774 cfs_duration_sec(jiffies - conn->gnc_last_noop_want),
3775 cfs_duration_sec(jiffies - conn->gnc_last_noop_sent),
3776 cfs_duration_sec(jiffies - conn->gnc_last_noop_cq));
3777 atomic_inc(&conn->gnc_sched_noop);
3778 set_mb(conn->gnc_last_noop_want, jiffies);
3780 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
3783 tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, conn->gnc_peer->gnp_net->gnn_ni->ni_nid);
3787 rc = kgnilnd_set_tx_id(tx, conn);
3789 kgnilnd_tx_done(tx, rc);
3795 tx = list_first_entry(&conn->gnc_fmaq, kgn_tx_t, tx_list);
3796 /* move from fmaq to allocd, kgnilnd_sendmsg will move to live_fmaq */
3797 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
3798 more_to_do = !list_empty(&conn->gnc_fmaq);
3799 spin_unlock(&conn->gnc_list_lock);
3802 /* if there is no real TX or no NOOP to send, bail */
3807 if (!tx->tx_retrans)
3808 tx->tx_cred_wait = jiffies;
3810 GNITX_ASSERTF(tx, tx->tx_id.txe_smsg_id != 0,
3811 "tx with zero id", NULL);
3813 CDEBUG(D_NET, "sending regular msg: %p, type %s(0x%02x), cookie %#llx\n",
3814 tx, kgnilnd_msgtype2str(tx->tx_msg.gnm_type),
3815 tx->tx_msg.gnm_type, tx->tx_id.txe_cookie);
3819 switch (tx->tx_msg.gnm_type) {
3823 case GNILND_MSG_NOOP:
3824 case GNILND_MSG_CLOSE:
3825 case GNILND_MSG_IMMEDIATE:
3826 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
3827 buffer = tx->tx_buffer;
3831 case GNILND_MSG_GET_DONE:
3832 case GNILND_MSG_PUT_DONE:
3833 case GNILND_MSG_PUT_DONE_REV:
3834 case GNILND_MSG_GET_DONE_REV:
3835 case GNILND_MSG_PUT_NAK:
3836 case GNILND_MSG_GET_NAK:
3837 case GNILND_MSG_GET_NAK_REV:
3838 case GNILND_MSG_PUT_NAK_REV:
3839 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
3842 case GNILND_MSG_PUT_REQ:
3843 case GNILND_MSG_GET_REQ_REV:
3844 tx->tx_msg.gnm_u.putreq.gnprm_cookie = tx->tx_id.txe_cookie;
3846 case GNILND_MSG_PUT_ACK:
3847 case GNILND_MSG_PUT_REQ_REV:
3848 case GNILND_MSG_GET_ACK_REV:
3849 case GNILND_MSG_GET_REQ:
3850 /* This is really only to handle the retransmit of SMSG once these
3851 * two messages are setup in send_mapped_tx */
3852 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3856 if (likely(rc == 0)) {
3857 rc = kgnilnd_sendmsg(tx, buffer, nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
3861 /* don't explicitly reschedule here - we are short credits and will rely on
3862 * kgnilnd_sendmsg to resched the conn if need be */
3864 } else if (rc < 0) {
3865 /* bail: it wasn't sent and we didn't get EAGAIN indicating we should retrans
3866 * almost certainly a software bug, but lets play nice with the other kids */
3867 kgnilnd_tx_done(tx, rc);
3868 /* just for fun, kick peer in arse - resetting conn might help to correct
3869 * this almost certainly buggy software caused return code */
3870 kgnilnd_close_conn(conn, rc);
3874 CDEBUG(D_NET, "Rescheduling %p (more to do)\n", conn);
3875 kgnilnd_schedule_conn(conn);
3880 kgnilnd_process_rdmaq(kgn_device_t *dev)
3885 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DELAY_RDMAQ)) {
3889 if (time_after_eq(jiffies, dev->gnd_rdmaq_deadline)) {
3890 unsigned long dead_bump;
3893 /* if we think we need to adjust, take lock to serialize and recheck */
3894 spin_lock(&dev->gnd_rdmaq_lock);
3895 if (time_after_eq(jiffies, dev->gnd_rdmaq_deadline)) {
3896 del_singleshot_timer_sync(&dev->gnd_rdmaq_timer);
3898 dead_bump = cfs_time_seconds(1) / *kgnilnd_tunables.kgn_rdmaq_intervals;
3900 /* roll the bucket forward */
3901 dev->gnd_rdmaq_deadline = jiffies + dead_bump;
3903 if (kgnilnd_data.kgn_rdmaq_override &&
3904 (*kgnilnd_tunables.kgn_rdmaq_intervals != 0)) {
3905 new_ok = kgnilnd_data.kgn_rdmaq_override / *kgnilnd_tunables.kgn_rdmaq_intervals;
3910 /* roll current outstanding forward to make sure we carry outstanding
3911 * committment forward
3912 * new_ok starts out as the whole interval value
3913 * - first subtract bytes_out from last interval, as that would push us over
3914 * strict limits for this interval
3915 * - second, set bytes_ok to new_ok to ensure it doesn't exceed the current auth
3917 * there is a small race here if someone is actively processing mappings and
3918 * adding to rdmaq_bytes_out, but it should be small as the mappings are triggered
3919 * quite quickly after kgnilnd_auth_rdma_bytes gives us the go-ahead
3920 * - if this gives us problems in the future, we could use a read/write lock
3921 * to protect the resetting of these values */
3922 new_ok -= atomic64_read(&dev->gnd_rdmaq_bytes_out);
3923 atomic64_set(&dev->gnd_rdmaq_bytes_ok, new_ok);
3925 CDEBUG(D_NET, "resetting rdmaq bytes to %ld, deadline +%lu -> %lu, "
3926 "current out %ld\n",
3927 atomic64_read(&dev->gnd_rdmaq_bytes_ok), dead_bump, dev->gnd_rdmaq_deadline,
3928 atomic64_read(&dev->gnd_rdmaq_bytes_out));
3930 spin_unlock(&dev->gnd_rdmaq_lock);
3933 spin_lock(&dev->gnd_rdmaq_lock);
3934 while (!list_empty(&dev->gnd_rdmaq)) {
3937 /* make sure we break out early on quiesce */
3938 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3939 /* always break with lock held - we unlock outside loop */
3943 tx = list_first_entry(&dev->gnd_rdmaq, kgn_tx_t, tx_list);
3944 kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
3947 /* sample with lock held, serializing with kgnilnd_complete_closed_conn */
3948 if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED) {
3949 /* if conn is dying, mark tx in tx_ref_table for
3950 * kgnilnd_complete_closed_conn to finish up */
3951 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_DYING, 1);
3953 /* tx was moved to DYING, get next */
3956 spin_unlock(&dev->gnd_rdmaq_lock);
3958 rc = kgnilnd_auth_rdma_bytes(dev, tx);
3959 spin_lock(&dev->gnd_rdmaq_lock);
3962 /* no ticket! add back to head */
3963 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_RDMAQ, 0);
3964 /* clear found_work so scheduler threads wait for timer */
3968 /* TX is GO for launch */
3969 tx->tx_qtime = jiffies;
3970 kgnilnd_send_mapped_tx(tx, 0);
3974 spin_unlock(&dev->gnd_rdmaq_lock);
3980 kgnilnd_swab_rdma_desc(kgn_rdma_desc_t *d)
3982 __swab64s(&d->gnrd_key.qword1);
3983 __swab64s(&d->gnrd_key.qword2);
3984 __swab64s(&d->gnrd_addr);
3985 __swab32s(&d->gnrd_nob);
3988 #define kgnilnd_match_reply_either(w, x, y, z) _kgnilnd_match_reply(w, x, y, z)
3989 #define kgnilnd_match_reply(x, y, z) _kgnilnd_match_reply(x, y, GNILND_MSG_NONE, z)
3992 _kgnilnd_match_reply(kgn_conn_t *conn, int type1, int type2, __u64 cookie)
3994 kgn_tx_ev_id_t ev_id;
3997 /* we use the cookie from the original TX, so we can find the match
3998 * by parsing that and using the txe_idx */
3999 ev_id.txe_cookie = cookie;
4001 tx = conn->gnc_tx_ref_table[ev_id.txe_idx];
4004 /* check tx to make sure kgni didn't eat it */
4005 GNITX_ASSERTF(tx, tx->tx_msg.gnm_magic == GNILND_MSG_MAGIC,
4006 "came back from kgni with bad magic %x\n", tx->tx_msg.gnm_magic);
4008 GNITX_ASSERTF(tx, ((tx->tx_id.txe_idx == ev_id.txe_idx) &&
4009 (tx->tx_id.txe_cookie = cookie)),
4010 "conn 0x%p->%s tx_ref_table hosed: wanted "
4011 "txe_cookie %#llx txe_idx %d "
4012 "found tx %p cookie %#llx txe_idx %d\n",
4013 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
4014 cookie, ev_id.txe_idx,
4015 tx, tx->tx_id.txe_cookie, tx->tx_id.txe_idx);
4017 LASSERTF((((tx->tx_msg.gnm_type == type1) || (tx->tx_msg.gnm_type == type2)) &&
4018 (tx->tx_state & GNILND_TX_WAITING_REPLY)),
4019 "Unexpected TX type (%x, %x or %x) "
4020 "or state (%x, expected +%x) "
4021 "matched reply from %s\n",
4022 tx->tx_msg.gnm_type, type1, type2,
4023 tx->tx_state, GNILND_TX_WAITING_REPLY,
4024 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4026 CWARN("Unmatched reply %02x, or %02x/%#llx from %s\n",
4027 type1, type2, cookie, libcfs_nid2str(conn->gnc_peer->gnp_nid));
4033 kgnilnd_complete_tx(kgn_tx_t *tx, int rc)
4036 kgn_conn_t *conn = tx->tx_conn;
4037 __u64 nob = tx->tx_nob;
4038 __u32 physnop = tx->tx_phys_npages;
4039 int id = tx->tx_id.txe_smsg_id;
4040 int buftype = tx->tx_buftype;
4041 gni_mem_handle_t hndl;
4042 hndl.qword1 = tx->tx_map_key.qword1;
4043 hndl.qword2 = tx->tx_map_key.qword2;
4045 spin_lock(&conn->gnc_list_lock);
4047 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
4048 "not waiting for reply", NULL);
4051 tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
4053 if (rc == -EFAULT) {
4054 CDEBUG(D_NETERROR, "Error %d TX data: TX %p tx_id %x nob %16llu physnop %8d buffertype %#8x MemHandle %#llx.%#llxx\n",
4055 rc, tx, id, nob, physnop, buftype, hndl.qword1, hndl.qword2);
4057 if(*kgnilnd_tunables.kgn_efault_lbug) {
4058 GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg,
4059 "error %d on tx 0x%p->%s id %u/%d state %s age %ds",
4061 libcfs_nid2str(conn->gnc_peer->gnp_nid) : "<?>",
4062 tx->tx_id.txe_smsg_id, tx->tx_id.txe_idx,
4063 kgnilnd_tx_state2str(tx->tx_list_state),
4064 cfs_duration_sec((unsigned long) jiffies - tx->tx_qtime));
4069 if (!(tx->tx_state & GNILND_TX_WAITING_COMPLETION)) {
4070 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
4071 /* sample under lock as follow on steps require gnc_list_lock
4072 * - or call kgnilnd_tx_done which requires no locks held over
4073 * call to lnet_finalize */
4076 spin_unlock(&conn->gnc_list_lock);
4079 kgnilnd_tx_done(tx, tx->tx_rc);
4084 kgnilnd_finalize_rx_done(kgn_tx_t *tx, kgn_msg_t *msg)
4087 kgn_conn_t *conn = tx->tx_conn;
4089 atomic_inc(&conn->gnc_device->gnd_rdma_nrx);
4090 atomic64_add(tx->tx_nob, &conn->gnc_device->gnd_rdma_rxbytes);
4092 /* the gncm_retval is passed in for PUTs */
4093 rc = kgnilnd_verify_rdma_cksum(tx, msg->gnm_payload_cksum,
4094 msg->gnm_u.completion.gncm_retval);
4096 kgnilnd_complete_tx(tx, rc);
4100 kgnilnd_check_fma_rx(kgn_conn_t *conn)
4108 kgn_peer_t *peer = conn->gnc_peer;
4111 __u16 tmp_cksum = 0, msg_cksum = 0;
4112 int repost = 1, saw_complete;
4113 unsigned long timestamp, newest_last_rx, timeout;
4117 /* Short circuit if the ep_handle is null.
4118 * It's likely that its about to be closed as stale.
4120 if (conn->gnc_ephandle == NULL)
4123 timestamp = jiffies;
4124 kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
4125 /* delay in jiffies - we are really concerned only with things that
4126 * result in a schedule() or really holding this off for long times .
4127 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
4128 conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
4130 /* Resample current time as we have no idea how long it took to get the mutex */
4131 timestamp = jiffies;
4133 /* We check here when the last time we received an rx, we do this before
4134 * we call getnext in case the thread has been blocked for a while. If we
4135 * havent received an rx since our timeout value we close the connection
4136 * as we should assume the other side has closed the connection. This will
4137 * stop us from sending replies to a mailbox that is already in purgatory.
4140 timeout = cfs_time_seconds(conn->gnc_timeout);
4141 newest_last_rx = GNILND_LASTRX(conn);
4143 /* Error injection to validate that timestamp checking works and closing the conn */
4144 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RECV_TIMEOUT)) {
4145 timestamp = timestamp + (GNILND_TIMEOUTRX(timeout) * 2);
4148 if (time_after_eq(timestamp, newest_last_rx + (GNILND_TIMEOUTRX(timeout)))) {
4149 GNIDBG_CONN(D_NETERROR|D_CONSOLE, conn, "Cant receive from %s after timeout lapse of %lu; TO %lu",
4150 libcfs_nid2str(conn->gnc_peer->gnp_nid),
4151 cfs_duration_sec(timestamp - newest_last_rx),
4152 cfs_duration_sec(GNILND_TIMEOUTRX(timeout)));
4153 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4155 kgnilnd_close_conn(conn, rc);
4159 rrc = kgnilnd_smsg_getnext(conn->gnc_ephandle, &prefix);
4161 if (rrc == GNI_RC_NOT_DONE) {
4162 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4163 CDEBUG(D_INFO, "SMSG RX empty conn 0x%p\n", conn);
4167 /* Instead of asserting when we get mailbox corruption lets attempt to
4168 * close the conn and recover. We can put the conn/mailbox into
4169 * purgatory and let purgatory deal with the problem. If we see
4170 * this NETTERROR reported on production systems in large amounts
4171 * we will need to revisit the state machine to see if we can tighten
4172 * it up further to improve data protection.
4175 if (rrc == GNI_RC_INVALID_STATE) {
4176 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4177 GNIDBG_CONN(D_NETERROR | D_CONSOLE, conn, "Mailbox corruption "
4178 "detected closing conn %p from peer %s\n", conn,
4179 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4181 kgnilnd_close_conn(conn, rc);
4185 LASSERTF(rrc == GNI_RC_SUCCESS,
4186 "bad rc %d on conn %p from peer %s\n",
4187 rrc, conn, libcfs_nid2str(peer->gnp_nid));
4189 msg = (kgn_msg_t *)prefix;
4191 rx = kgnilnd_alloc_rx();
4193 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4194 kgnilnd_release_msg(conn);
4195 GNIDBG_MSG(D_NETERROR, msg, "Dropping SMSG RX from 0x%p->%s, no RX memory",
4196 conn, libcfs_nid2str(peer->gnp_nid));
4200 GNIDBG_MSG(D_INFO, msg, "SMSG RX on %p", conn);
4202 timestamp = conn->gnc_last_rx;
4203 seq = last_seq = atomic_read(&conn->gnc_rx_seq);
4204 atomic_inc(&conn->gnc_rx_seq);
4206 conn->gnc_last_rx = jiffies;
4207 /* stash first rx so we can clear out purgatory
4209 if (conn->gnc_first_rx == 0)
4210 conn->gnc_first_rx = jiffies;
4212 /* needs to linger to protect gnc_rx_seq like we do with gnc_tx_seq */
4213 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4214 kgnilnd_peer_alive(conn->gnc_peer);
4217 rx->grx_conn = conn;
4219 rx->grx_received = current_kernel_time();
4221 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NET_LOOKUP)) {
4224 rc = kgnilnd_find_net(msg->gnm_srcnid, &net);
4230 kgnilnd_net_decref(net);
4233 if (*kgnilnd_tunables.kgn_checksum && !msg->gnm_cksum)
4234 GNIDBG_MSG(D_WARNING, msg, "no msg header checksum when enabled");
4236 /* XXX Nic: Do we need to swab cksum */
4237 if (msg->gnm_cksum != 0) {
4238 msg_cksum = msg->gnm_cksum;
4240 tmp_cksum = kgnilnd_cksum(msg, sizeof(kgn_msg_t));
4242 if (tmp_cksum != msg_cksum) {
4243 GNIDBG_MSG(D_NETERROR, msg, "Bad hdr checksum (%x expected %x)",
4244 tmp_cksum, msg_cksum);
4245 kgnilnd_dump_msg(D_BUFFS, msg);
4250 /* restore checksum for future debug messages */
4251 msg->gnm_cksum = tmp_cksum;
4253 if (msg->gnm_magic != GNILND_MSG_MAGIC) {
4254 if (__swab32(msg->gnm_magic) != GNILND_MSG_MAGIC) {
4255 GNIDBG_MSG(D_NETERROR, msg, "Unexpected magic %08x from %s",
4256 msg->gnm_magic, libcfs_nid2str(peer->gnp_nid));
4261 __swab32s(&msg->gnm_magic);
4262 __swab16s(&msg->gnm_version);
4263 __swab16s(&msg->gnm_type);
4264 __swab64s(&msg->gnm_srcnid);
4265 __swab64s(&msg->gnm_connstamp);
4266 __swab32s(&msg->gnm_seq);
4268 /* NB message type checked below; NOT here... */
4269 switch (msg->gnm_type) {
4270 case GNILND_MSG_GET_ACK_REV:
4271 case GNILND_MSG_PUT_ACK:
4272 kgnilnd_swab_rdma_desc(&msg->gnm_u.putack.gnpam_desc);
4275 case GNILND_MSG_PUT_REQ_REV:
4276 case GNILND_MSG_GET_REQ:
4277 kgnilnd_swab_rdma_desc(&msg->gnm_u.get.gngm_desc);
4285 if (msg->gnm_version != GNILND_MSG_VERSION) {
4286 GNIDBG_MSG(D_NETERROR, msg, "Unexpected protocol version %d from %s",
4287 msg->gnm_version, libcfs_nid2str(peer->gnp_nid));
4292 if (LNET_NIDADDR(msg->gnm_srcnid) != LNET_NIDADDR(peer->gnp_nid)) {
4293 GNIDBG_MSG(D_NETERROR, msg, "Unexpected peer %s from %s",
4294 libcfs_nid2str(msg->gnm_srcnid),
4295 libcfs_nid2str(peer->gnp_nid));
4300 if (msg->gnm_connstamp != conn->gnc_peer_connstamp) {
4301 GNIDBG_MSG(D_NETERROR, msg, "Unexpected connstamp %#llx(%#llx"
4302 " expected) from %s",
4303 msg->gnm_connstamp, conn->gnc_peer_connstamp,
4304 libcfs_nid2str(peer->gnp_nid));
4309 if (msg->gnm_seq != seq) {
4310 GNIDBG_MSG(D_NETERROR, msg, "Unexpected sequence number %d(%d expected) from %s",
4311 msg->gnm_seq, seq, libcfs_nid2str(peer->gnp_nid));
4316 atomic_inc(&conn->gnc_device->gnd_short_nrx);
4318 if (msg->gnm_type == GNILND_MSG_CLOSE) {
4319 CDEBUG(D_NETTRACE, "%s sent us CLOSE msg\n",
4320 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4321 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
4322 conn->gnc_close_recvd = GNILND_CLOSE_RX;
4323 conn->gnc_peer_error = msg->gnm_u.completion.gncm_retval;
4324 /* double check state with lock held */
4325 if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
4326 /* only error if we are not already closing */
4327 if (conn->gnc_peer_error == -ETIMEDOUT) {
4328 unsigned long now = jiffies;
4329 CNETERR("peer 0x%p->%s closed connection 0x%p due to timeout. "
4331 "RX %d @ %lus/%lus; TX %d @ %lus/%lus; "
4332 "NOOP %lus/%lus/%lus; sched %lus/%lus/%lus ago\n",
4333 conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
4335 cfs_duration_sec(now - timestamp),
4336 cfs_duration_sec(now - conn->gnc_last_rx_cq),
4337 atomic_read(&conn->gnc_tx_seq),
4338 cfs_duration_sec(now - conn->gnc_last_tx),
4339 cfs_duration_sec(now - conn->gnc_last_tx_cq),
4340 cfs_duration_sec(now - conn->gnc_last_noop_want),
4341 cfs_duration_sec(now - conn->gnc_last_noop_sent),
4342 cfs_duration_sec(now - conn->gnc_last_noop_cq),
4343 cfs_duration_sec(now - conn->gnc_last_sched_ask),
4344 cfs_duration_sec(now - conn->gnc_last_sched_do),
4345 cfs_duration_sec(now - conn->gnc_device->gnd_sched_alive));
4347 kgnilnd_close_conn_locked(conn, -ECONNRESET);
4349 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
4353 if (conn->gnc_close_recvd) {
4354 GNIDBG_MSG(D_NETERROR, msg, "Unexpected message %s(%d/%d) after CLOSE from %s",
4355 kgnilnd_msgtype2str(msg->gnm_type),
4356 msg->gnm_type, conn->gnc_close_recvd,
4357 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4362 if (conn->gnc_state != GNILND_CONN_ESTABLISHED) {
4363 /* XXX Nic: log message received on bad connection state */
4367 switch (msg->gnm_type) {
4368 case GNILND_MSG_NOOP:
4369 /* Nothing to do; just a keepalive */
4372 case GNILND_MSG_IMMEDIATE:
4373 /* only get SMSG payload for IMMEDIATE */
4374 atomic64_add(msg->gnm_payload_len, &conn->gnc_device->gnd_short_rxbytes);
4375 rc = lnet_parse(net->gnn_ni, &msg->gnm_u.immediate.gnim_hdr,
4376 msg->gnm_srcnid, rx, 0);
4379 case GNILND_MSG_GET_REQ_REV:
4380 case GNILND_MSG_PUT_REQ:
4381 rc = lnet_parse(net->gnn_ni, &msg->gnm_u.putreq.gnprm_hdr,
4382 msg->gnm_srcnid, rx, 1);
4385 case GNILND_MSG_GET_NAK_REV:
4386 tx = kgnilnd_match_reply_either(conn, GNILND_MSG_GET_REQ_REV, GNILND_MSG_GET_ACK_REV,
4387 msg->gnm_u.completion.gncm_cookie);
4391 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4393 case GNILND_MSG_PUT_NAK:
4394 tx = kgnilnd_match_reply_either(conn, GNILND_MSG_PUT_REQ, GNILND_MSG_PUT_ACK,
4395 msg->gnm_u.completion.gncm_cookie);
4399 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4401 case GNILND_MSG_PUT_ACK:
4402 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ,
4403 msg->gnm_u.putack.gnpam_src_cookie);
4407 /* store putack data for later: deferred rdma or re-try */
4408 tx->tx_putinfo = msg->gnm_u.putack;
4411 spin_lock(&tx->tx_conn->gnc_list_lock);
4413 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
4414 "not waiting for reply", NULL);
4416 tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
4418 if (likely(!(tx->tx_state & GNILND_TX_WAITING_COMPLETION))) {
4419 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
4420 /* sample under lock as follow on steps require gnc_list_lock
4421 * - or call kgnilnd_tx_done which requires no locks held over
4422 * call to lnet_finalize */
4425 /* cannot launch rdma if still waiting for fma-msg completion */
4426 CDEBUG(D_NET, "tx 0x%p type 0x%02x will need to "
4427 "wait for SMSG completion\n", tx, tx->tx_msg.gnm_type);
4428 tx->tx_state |= GNILND_TX_PENDING_RDMA;
4430 spin_unlock(&tx->tx_conn->gnc_list_lock);
4433 rc = kgnilnd_send_mapped_tx(tx, 0);
4435 kgnilnd_tx_done(tx, rc);
4438 case GNILND_MSG_GET_ACK_REV:
4439 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ_REV,
4440 msg->gnm_u.putack.gnpam_src_cookie);
4444 /* store putack data for later: deferred rdma or re-try */
4445 tx->tx_putinfo = msg->gnm_u.putack;
4447 spin_lock(&tx->tx_conn->gnc_list_lock);
4449 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
4450 "not waiting for reply", NULL);
4452 tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
4454 if (likely(!(tx->tx_state & GNILND_TX_WAITING_COMPLETION))) {
4455 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
4456 /* sample under lock as follow on steps require gnc_list_lock
4457 * - or call kgnilnd_tx_done which requires no locks held over
4458 * call to lnet_finalize */
4461 /* cannot launch rdma if still waiting for fma-msg completion */
4462 CDEBUG(D_NET, "tx 0x%p type 0x%02x will need to "
4463 "wait for SMSG completion\n", tx, tx->tx_msg.gnm_type);
4464 tx->tx_state |= GNILND_TX_PENDING_RDMA;
4466 spin_unlock(&tx->tx_conn->gnc_list_lock);
4469 rc = kgnilnd_send_mapped_tx(tx, 0);
4471 kgnilnd_tx_done(tx, rc);
4474 case GNILND_MSG_PUT_DONE:
4475 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_ACK,
4476 msg->gnm_u.completion.gncm_cookie);
4480 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED ||
4481 tx->tx_buftype == GNILND_BUF_VIRT_MAPPED,
4482 "bad tx buftype %d", tx->tx_buftype);
4484 kgnilnd_finalize_rx_done(tx, msg);
4486 case GNILND_MSG_PUT_REQ_REV:
4487 case GNILND_MSG_GET_REQ:
4488 rc = lnet_parse(net->gnn_ni, &msg->gnm_u.get.gngm_hdr,
4489 msg->gnm_srcnid, rx, 1);
4493 case GNILND_MSG_GET_NAK:
4494 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ,
4495 msg->gnm_u.completion.gncm_cookie);
4499 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED ||
4500 tx->tx_buftype == GNILND_BUF_VIRT_MAPPED,
4501 "bad tx buftype %d", tx->tx_buftype);
4503 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4506 case GNILND_MSG_GET_DONE:
4507 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ,
4508 msg->gnm_u.completion.gncm_cookie);
4512 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED ||
4513 tx->tx_buftype == GNILND_BUF_VIRT_MAPPED,
4514 "bad tx buftype %d", tx->tx_buftype);
4516 lnet_set_reply_msg_len(net->gnn_ni, tx->tx_lntmsg[1],
4517 msg->gnm_u.completion.gncm_retval);
4519 kgnilnd_finalize_rx_done(tx, msg);
4521 case GNILND_MSG_GET_DONE_REV:
4522 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_ACK_REV,
4523 msg->gnm_u.completion.gncm_cookie);
4527 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED ||
4528 tx->tx_buftype == GNILND_BUF_VIRT_MAPPED,
4529 "bad tx buftype %d", tx->tx_buftype);
4531 kgnilnd_finalize_rx_done(tx, msg);
4534 case GNILND_MSG_PUT_DONE_REV:
4535 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ_REV,
4536 msg->gnm_u.completion.gncm_cookie);
4541 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED ||
4542 tx->tx_buftype == GNILND_BUF_VIRT_MAPPED,
4543 "bad tx buftype %d", tx->tx_buftype);
4545 kgnilnd_finalize_rx_done(tx, msg);
4547 case GNILND_MSG_PUT_NAK_REV:
4548 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ_REV,
4549 msg->gnm_u.completion.gncm_cookie);
4554 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED ||
4555 tx->tx_buftype == GNILND_BUF_VIRT_MAPPED,
4556 "bad tx buftype %d", tx->tx_buftype);
4558 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4563 if (rc < 0) /* protocol/comms error */
4564 kgnilnd_close_conn(conn, rc);
4566 if (repost && rx != NULL) {
4567 kgnilnd_consume_rx(rx);
4570 /* we got an event so assume more there and call for reschedule */
4572 kgnilnd_schedule_conn(conn);
4576 /* Do the failure injections that we need to affect conn processing in the following function.
4577 * When writing tests that use this function make sure to use a fail_loc with a fail mask.
4578 * If you dont you can cause the scheduler threads to spin on the conn without it leaving
4581 * intent is used to signal the calling function whether or not the conn needs to be rescheduled.
4585 kgnilnd_check_conn_fail_loc(kgn_device_t *dev, kgn_conn_t *conn, int *intent)
4589 /* short circuit out when not set */
4590 if (likely(!cfs_fail_loc)) {
4594 /* failure injection to test for stack reset clean ups */
4595 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DROP_CLOSING)) {
4596 /* we can't rely on busy loops being nice enough to get the
4597 * stack reset triggered - it'd just spin on this conn */
4598 CFS_RACE(CFS_FAIL_GNI_DROP_CLOSING);
4601 GOTO(did_fail_loc, rc);
4604 if (conn->gnc_state == GNILND_CONN_DESTROY_EP) {
4605 /* DESTROY_EP set in kgnilnd_conn_decref on gnc_refcount = 1 */
4607 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DROP_DESTROY_EP)) {
4608 CFS_RACE(CFS_FAIL_GNI_DROP_DESTROY_EP);
4611 GOTO(did_fail_loc, rc);
4615 /* CFS_FAIL_GNI_FINISH_PURG2 is used to stop a connection from fully closing. This scheduler
4616 * will spin on the CFS_FAIL_TIMEOUT until the fail_loc is cleared at which time the connection
4617 * will be closed by kgnilnd_complete_closed_conn.
4619 if ((conn->gnc_state == GNILND_CONN_CLOSED) && CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG2)) {
4620 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_FINISH_PURG2, 1)) {};
4623 GOTO(did_fail_loc, rc);
4626 /* this one is a bit gross - we can't hold the mutex from process_conns
4627 * across a CFS_RACE here - it'd block the conn threads from doing an ep_bind
4628 * and moving onto finish_connect
4629 * so, we'll just set the rc - kgnilnd_process_conns will clear
4630 * found_work on a fail_loc, getting the scheduler thread to call schedule()
4631 * and effectively getting this thread to sleep */
4632 if ((conn->gnc_state == GNILND_CONN_CLOSED) && CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG)) {
4635 GOTO(did_fail_loc, rc);
4643 kgnilnd_send_conn_close(kgn_conn_t *conn)
4647 /* we are closing the conn - we will try to send the CLOSE msg
4648 * but will not wait for anything else to flush */
4650 /* send the close if not already done so or received one */
4651 if (!conn->gnc_close_sent && !conn->gnc_close_recvd) {
4652 /* set close_sent regardless of the success of the
4653 * CLOSE message. We are going to try once and then
4654 * kick him out of the sandbox */
4655 conn->gnc_close_sent = 1;
4658 /* EP might be null already if remote side initiated a new connection.
4659 * kgnilnd_finish_connect destroys existing ep_handles before wiring up the new connection,
4660 * so this check is here to make sure we dont attempt to send with a null ep_handle.
4662 if (conn->gnc_ephandle != NULL) {
4665 tx = kgnilnd_new_tx_msg(GNILND_MSG_CLOSE, conn->gnc_peer->gnp_net->gnn_ni->ni_nid);
4667 tx->tx_msg.gnm_u.completion.gncm_retval = conn->gnc_error;
4668 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
4669 tx->tx_qtime = jiffies;
4671 if (tx->tx_id.txe_idx == 0) {
4672 rc = kgnilnd_set_tx_id(tx, conn);
4674 kgnilnd_tx_done(tx, rc);
4678 CDEBUG(D_NETTRACE, "sending close with errno %d\n",
4681 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CLOSE_SEND)) {
4682 kgnilnd_tx_done(tx, -EAGAIN);
4684 rc = kgnilnd_sendmsg(tx, NULL, 0, NULL, GNILND_TX_FMAQ);
4686 /* It wasnt sent and we dont care. */
4687 kgnilnd_tx_done(tx, rc);
4695 /* When changing gnc_state we need to take the kgn_peer_conn_lock */
4696 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
4697 conn->gnc_state = GNILND_CONN_CLOSED;
4698 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
4699 /* mark this conn as CLOSED now that we processed it
4700 * do after TX, so we can use CLOSING in asserts */
4704 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RX_CLOSE_CLOSED)) {
4705 /* simulate a RX CLOSE after the timeout but before
4706 * the scheduler thread gets it */
4707 conn->gnc_close_recvd = GNILND_CLOSE_INJECT2;
4708 conn->gnc_peer_error = -ETIMEDOUT;
4710 /* schedule to allow potential CLOSE and get the complete phase run */
4711 kgnilnd_schedule_conn(conn);
4715 kgnilnd_process_mapped_tx(kgn_device_t *dev)
4720 int fast_remaps = GNILND_FAST_MAPPING_TRY;
4721 int log_retrans, log_retrans_level;
4722 static int last_map_version;
4725 spin_lock(&dev->gnd_lock);
4726 if (list_empty(&dev->gnd_map_tx)) {
4727 /* if the list is empty make sure we dont have a timer running */
4728 del_singleshot_timer_sync(&dev->gnd_map_timer);
4729 spin_unlock(&dev->gnd_lock);
4733 dev->gnd_sched_alive = jiffies;
4735 /* we'll retry as fast as possible up to 25% of the limit, then we start
4736 * backing off until our map version changes - indicating we unmapped
4738 tx = list_first_entry(&dev->gnd_map_tx, kgn_tx_t, tx_list);
4739 if (likely(dev->gnd_map_attempt == 0) ||
4740 time_after_eq(jiffies, dev->gnd_next_map) ||
4741 last_map_version != dev->gnd_map_version) {
4743 /* if this is our first attempt at mapping set last mapped to current
4744 * jiffies so we can timeout our attempt correctly.
4746 if (dev->gnd_map_attempt == 0)
4747 dev->gnd_last_map = jiffies;
4749 GNIDBG_TX(D_NET, tx, "waiting for mapping event event to retry", NULL);
4750 spin_unlock(&dev->gnd_lock);
4754 /* delete the previous timer if it exists */
4755 del_singleshot_timer_sync(&dev->gnd_map_timer);
4756 /* stash the last map version to let us know when a good one was seen */
4757 last_map_version = dev->gnd_map_version;
4759 /* we need to to take the lock and continually refresh the head of the list as
4760 * kgnilnd_complete_closed_conn might be nuking stuff and we are cycling the lock
4761 * allowing them to squeeze in */
4763 while (!list_empty(&dev->gnd_map_tx)) {
4764 /* make sure we break out early on quiesce */
4765 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
4766 /* always break with lock held - we unlock outside loop */
4770 tx = list_first_entry(&dev->gnd_map_tx, kgn_tx_t, tx_list);
4772 kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
4775 /* sample with lock held, serializing with kgnilnd_complete_closed_conn */
4776 if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED) {
4777 /* if conn is dying, mark tx in tx_ref_table for
4778 * kgnilnd_complete_closed_conn to finish up */
4779 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_DYING, 1);
4782 /* tx was moved to DYING, get next */
4786 spin_unlock(&dev->gnd_lock);
4787 rc = kgnilnd_send_mapped_tx(tx, 1);
4789 /* We made it! skip error handling.. */
4791 /* OK to continue on +ve errors as it won't get seen until
4792 * this function is called again - we operate on a copy of the original
4793 * list and not the live list */
4794 spin_lock(&dev->gnd_lock);
4795 /* reset map attempts back to zero we successfully
4796 * mapped so we can reset our timers */
4797 dev->gnd_map_attempt = 0;
4799 } else if (rc == -EAGAIN) {
4800 spin_lock(&dev->gnd_lock);
4801 mod_timer(&dev->gnd_map_timer, dev->gnd_next_map);
4802 spin_unlock(&dev->gnd_lock);
4803 GOTO(get_out_mapped, rc);
4804 } else if (rc != -ENOMEM) {
4805 /* carp, failure we can't handle */
4806 kgnilnd_tx_done(tx, rc);
4807 spin_lock(&dev->gnd_lock);
4808 /* reset map attempts back to zero we dont know what happened but it
4809 * wasnt a failed mapping
4811 dev->gnd_map_attempt = 0;
4815 /* time to handle the retry cases.. lock so we dont have 2 threads
4816 * mucking with gnd_map_attempt, or gnd_next_map at the same time.
4818 spin_lock(&dev->gnd_lock);
4819 dev->gnd_map_attempt++;
4820 if (dev->gnd_map_attempt < fast_remaps) {
4821 /* do nothing we just want it to go as fast as possible.
4822 * just set gnd_next_map to current jiffies so it will process
4823 * as fast as possible.
4825 dev->gnd_next_map = jiffies;
4827 /* Retry based on GNILND_MAP_RETRY_RATE */
4828 dev->gnd_next_map = jiffies + GNILND_MAP_RETRY_RATE;
4831 /* only log occasionally once we've retried fast_remaps */
4832 log_retrans = (dev->gnd_map_attempt >= fast_remaps) &&
4833 ((dev->gnd_map_attempt % fast_remaps) == 0);
4834 log_retrans_level = log_retrans ? D_NETERROR : D_NET;
4836 /* make sure we are not off in the weeds with this tx */
4837 if (time_after(jiffies, dev->gnd_last_map + GNILND_MAP_TIMEOUT)) {
4838 GNIDBG_TX(D_NETERROR, tx,
4839 "giving up on TX, too many retries", NULL);
4840 spin_unlock(&dev->gnd_lock);
4841 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ ||
4842 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ_REV) {
4843 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type,
4845 tx->tx_putinfo.gnpam_dst_cookie,
4846 tx->tx_msg.gnm_srcnid);
4848 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type,
4850 tx->tx_getinfo.gngm_cookie,
4851 tx->tx_msg.gnm_srcnid);
4853 kgnilnd_tx_done(tx, -ENOMEM);
4854 GOTO(get_out_mapped, rc);
4856 GNIDBG_TX(log_retrans_level, tx,
4857 "transient map failure #%d %d pages/%d bytes phys %u@%u "
4859 "nq_map %d mdd# %d/%d GART %ld",
4860 dev->gnd_map_attempt, tx->tx_phys_npages, tx->tx_nob,
4861 dev->gnd_map_nphys, dev->gnd_map_physnop * PAGE_SIZE,
4862 dev->gnd_map_nvirt, dev->gnd_map_virtnob,
4863 atomic_read(&dev->gnd_nq_map),
4864 atomic_read(&dev->gnd_n_mdd), atomic_read(&dev->gnd_n_mdd_held),
4865 atomic64_read(&dev->gnd_nbytes_map));
4868 /* we need to stop processing the rest of the list, so add it back in */
4869 /* set timer to wake device when we need to schedule this tx */
4870 mod_timer(&dev->gnd_map_timer, dev->gnd_next_map);
4871 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 0);
4872 spin_unlock(&dev->gnd_lock);
4873 GOTO(get_out_mapped, rc);
4875 spin_unlock(&dev->gnd_lock);
4881 kgnilnd_process_conns(kgn_device_t *dev, unsigned long deadline)
4886 int error_inject = 0;
4890 spin_lock(&dev->gnd_lock);
4891 while (!list_empty(&dev->gnd_ready_conns) && time_before(jiffies, deadline)) {
4892 dev->gnd_sched_alive = jiffies;
4896 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
4897 /* break with lock held */
4901 conn = list_first_entry(&dev->gnd_ready_conns, kgn_conn_t, gnc_schedlist);
4902 list_del_init(&conn->gnc_schedlist);
4903 spin_unlock(&dev->gnd_lock);
4905 conn_sched = xchg(&conn->gnc_scheduled, GNILND_CONN_PROCESS);
4907 LASSERTF(conn_sched != GNILND_CONN_IDLE &&
4908 conn_sched != GNILND_CONN_PROCESS,
4909 "conn %p on ready list but in bad state: %d\n",
4912 CDEBUG(D_INFO, "conn %p@%s for processing\n",
4913 conn, kgnilnd_conn_state2str(conn));
4916 set_mb(conn->gnc_last_sched_do, jiffies);
4918 if (kgnilnd_check_conn_fail_loc(dev, conn, &intent)) {
4920 /* based on intent see if we should run again. */
4921 rc = kgnilnd_schedule_process_conn(conn, intent);
4923 /* drop ref from gnd_ready_conns */
4924 if (atomic_read(&conn->gnc_refcount) == 1 && rc != 1) {
4925 down_write(&dev->gnd_conn_sem);
4926 kgnilnd_conn_decref(conn);
4927 up_write(&dev->gnd_conn_sem);
4928 } else if (rc != 1) {
4929 kgnilnd_conn_decref(conn);
4931 /* clear this so that scheduler thread doesn't spin */
4933 /* break with lock held... */
4934 spin_lock(&dev->gnd_lock);
4938 if (unlikely(conn->gnc_state == GNILND_CONN_CLOSED)) {
4939 down_write(&dev->gnd_conn_sem);
4941 /* CONN_CLOSED set in procces_fmaq when CLOSE is sent */
4942 if (unlikely(atomic_read(&conn->gnc_tx_in_use))) {
4943 /* If there are tx's currently in use in another
4944 * thread we dont want to complete the close
4945 * yet. Cycle this conn back through
4947 kgnilnd_schedule_conn(conn);
4949 kgnilnd_complete_closed_conn(conn);
4951 up_write(&dev->gnd_conn_sem);
4952 } else if (unlikely(conn->gnc_state == GNILND_CONN_DESTROY_EP)) {
4953 /* DESTROY_EP set in kgnilnd_conn_decref on gnc_refcount = 1 */
4954 /* serialize SMSG CQs with ep_bind and smsg_release */
4955 down_write(&dev->gnd_conn_sem);
4956 kgnilnd_destroy_conn_ep(conn);
4957 up_write(&dev->gnd_conn_sem);
4958 } else if (unlikely(conn->gnc_state == GNILND_CONN_CLOSING)) {
4959 /* if we need to do some CLOSE sending, etc done here do it */
4960 down_write(&dev->gnd_conn_sem);
4961 kgnilnd_send_conn_close(conn);
4962 kgnilnd_check_fma_rx(conn);
4963 up_write(&dev->gnd_conn_sem);
4964 } else if (atomic_read(&conn->gnc_peer->gnp_dirty_eps) == 0) {
4965 /* start moving traffic if the old conns are cleared out */
4966 down_read(&dev->gnd_conn_sem);
4967 kgnilnd_check_fma_rx(conn);
4968 kgnilnd_process_fmaq(conn);
4969 up_read(&dev->gnd_conn_sem);
4972 rc = kgnilnd_schedule_process_conn(conn, 0);
4974 /* drop ref from gnd_ready_conns */
4975 if (atomic_read(&conn->gnc_refcount) == 1 && rc != 1) {
4976 down_write(&dev->gnd_conn_sem);
4977 kgnilnd_conn_decref(conn);
4978 up_write(&dev->gnd_conn_sem);
4979 } else if (rc != 1) {
4980 kgnilnd_conn_decref(conn);
4983 /* check list again with lock held */
4984 spin_lock(&dev->gnd_lock);
4987 /* If we are short circuiting due to timing we want to be scheduled
4988 * as soon as possible.
4990 if (!list_empty(&dev->gnd_ready_conns) && !error_inject)
4993 spin_unlock(&dev->gnd_lock);
4999 kgnilnd_scheduler(void *arg)
5001 int threadno = (long)arg;
5004 unsigned long deadline = 0;
5007 dev = &kgnilnd_data.kgn_devices[(threadno + 1) % kgnilnd_data.kgn_ndevs];
5009 cfs_block_allsigs();
5011 /* all gnilnd threads need to run fairly urgently */
5012 set_user_nice(current, *kgnilnd_tunables.kgn_sched_nice);
5013 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
5014 while (!kgnilnd_data.kgn_shutdown) {
5016 /* Safe: kgn_shutdown only set when quiescent */
5018 /* to quiesce or to not quiesce, that is the question */
5020 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
5021 KGNILND_SPIN_QUIESCE;
5024 /* tracking for when thread goes AWOL */
5025 dev->gnd_sched_alive = jiffies;
5027 CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_SCHED_DEADLINE,
5028 (*kgnilnd_tunables.kgn_sched_timeout + 1));
5029 /* let folks know we are up and kicking
5030 * - they can use this for latency savings, etc
5031 * - only change if IRQ, if IDLE leave alone as that
5032 * schedule_device calls to put us back to IRQ */
5033 (void)cmpxchg(&dev->gnd_ready, GNILND_DEV_IRQ, GNILND_DEV_LOOP);
5035 down_read(&dev->gnd_conn_sem);
5036 /* always check these - they are super low cost */
5037 found_work += kgnilnd_check_fma_send_cq(dev);
5038 found_work += kgnilnd_check_fma_rcv_cq(dev);
5040 /* rdma CQ doesn't care about eps */
5041 found_work += kgnilnd_check_rdma_cq(dev);
5043 /* move some RDMA ? */
5044 found_work += kgnilnd_process_rdmaq(dev);
5046 /* map some pending RDMA requests ? */
5047 found_work += kgnilnd_process_mapped_tx(dev);
5049 /* the EP for a conn is not destroyed until all the references
5050 * to it are gone, so these checks should be safe
5051 * even if run in parallel with the CQ checking functions
5052 * _AND_ a thread that processes the CLOSED->DONE
5056 up_read(&dev->gnd_conn_sem);
5058 /* process all conns ready now */
5059 found_work += kgnilnd_process_conns(dev, deadline);
5061 /* do an eager check to avoid the IRQ disabling in
5062 * prepare_to_wait and friends */
5065 (busy_loops++ < *kgnilnd_tunables.kgn_loops) &&
5066 time_before(jiffies, deadline)) {
5068 if ((busy_loops % 10) == 0) {
5069 /* tickle heartbeat and watchdog to ensure our
5070 * piggishness doesn't turn into heartbeat failure */
5071 touch_nmi_watchdog();
5077 /* if we got here, found_work was zero or busy_loops means we
5078 * need to take a break. We'll clear gnd_ready but we'll check
5079 * one last time if there is an IRQ that needs processing */
5081 prepare_to_wait(&dev->gnd_waitq, &wait, TASK_INTERRUPTIBLE);
5083 /* the first time this will go LOOP -> IDLE and let us do one final check
5084 * during which we might get an IRQ, then IDLE->IDLE and schedule()
5085 * - this might allow other threads to block us for a bit if they
5086 * try to get the mutex, but that is good as we'd need to wake
5087 * up soon to handle the CQ or other processing anyways */
5089 found_work += xchg(&dev->gnd_ready, GNILND_DEV_IDLE);
5091 if ((busy_loops >= *kgnilnd_tunables.kgn_loops) ||
5092 time_after_eq(jiffies, deadline)) {
5094 "yeilding: found_work %d busy_loops %d\n",
5095 found_work, busy_loops);
5097 /* use yield if we are bailing due to busy_loops
5098 * - this will ensure we wake up soonish. This closes
5099 * a race with kgnilnd_device_callback - where it'd
5100 * not call wake_up() because gnd_ready == 1, but then
5101 * we come down and schedule() because of busy_loops.
5102 * We'd not be woken up until something poked our waitq
5103 * again. yield() ensures we wake up without another
5104 * waitq poke in that case */
5105 atomic_inc(&dev->gnd_n_yield);
5106 kgnilnd_data.kgn_last_condresched = jiffies;
5108 CDEBUG(D_INFO, "awake after yeild\n");
5109 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
5110 } else if (found_work == GNILND_DEV_IDLE) {
5111 /* busy_loops is low and there is nothing to do,
5112 * go to sleep and wait for a waitq poke */
5114 "scheduling: found_work %d busy_loops %d\n",
5115 found_work, busy_loops);
5116 atomic_inc(&dev->gnd_n_schedule);
5117 kgnilnd_data.kgn_last_scheduled = jiffies;
5119 CDEBUG(D_INFO, "awake after schedule\n");
5120 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
5122 finish_wait(&dev->gnd_waitq, &wait);
5125 kgnilnd_thread_fini();