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>
29 #include <linux/pagemap.h>
31 #include <libcfs/linux/linux-mem.h>
35 /* this is useful when needed to debug wire corruption. */
37 kgnilnd_dump_blob(int level, char *prefix, void *buf, int len) {
45 "%s 0x%p: 0x%16.16llx 0x%16.16llx 0x%16.16llx 0x%16.16llx\n",
46 prefix, ptr, *(ptr), *(ptr + 1), *(ptr + 2), *(ptr + 3));
49 } else if (len >= 16) {
51 "%s 0x%p: 0x%16.16llx 0x%16.16llx\n",
52 prefix, ptr, *(ptr), *(ptr + 1));
56 CDEBUG(level, "%s 0x%p: 0x%16.16llx\n",
65 kgnilnd_dump_msg(int mask, kgn_msg_t *msg)
67 CDEBUG(mask, "0x%8.8x 0x%4.4x 0x%4.4x 0x%16.16llx"
68 " 0x%16.16llx 0x%8.8x 0x%4.4x 0x%4.4x 0x%8.8x\n",
69 msg->gnm_magic, msg->gnm_version,
70 msg->gnm_type, msg->gnm_srcnid,
71 msg->gnm_connstamp, msg->gnm_seq,
72 msg->gnm_cksum, msg->gnm_payload_cksum,
73 msg->gnm_payload_len);
77 kgnilnd_schedule_device(kgn_device_t *dev)
79 short already_live = 0;
81 /* we'll only want to wake if the scheduler thread
82 * has come around and set ready to zero */
83 already_live = cmpxchg(&dev->gnd_ready, GNILND_DEV_IDLE, GNILND_DEV_IRQ);
86 wake_up(&dev->gnd_waitq);
89 void kgnilnd_schedule_device_timer(cfs_timer_cb_arg_t data)
91 kgn_device_t *dev = cfs_from_timer(dev, data, gnd_map_timer);
93 kgnilnd_schedule_device(dev);
96 void kgnilnd_schedule_device_timer_rd(cfs_timer_cb_arg_t data)
98 kgn_device_t *dev = cfs_from_timer(dev, data, gnd_rdmaq_timer);
100 kgnilnd_schedule_device(dev);
104 kgnilnd_device_callback(__u32 devid, __u64 arg)
107 int index = (int) arg;
109 if (index >= kgnilnd_data.kgn_ndevs) {
110 /* use _EMERG instead of an LBUG to prevent LBUG'ing in
111 * interrupt context. */
112 LCONSOLE_EMERG("callback for unknown device %d->%d\n",
117 dev = &kgnilnd_data.kgn_devices[index];
118 /* just basic sanity */
119 if (dev->gnd_id == devid) {
120 kgnilnd_schedule_device(dev);
122 LCONSOLE_EMERG("callback for bad device %d devid %d\n",
127 /* sched_intent values:
128 * < 0 : do not reschedule under any circumstances
129 * == 0: reschedule if someone marked him WANTS_SCHED
130 * > 0 : force a reschedule */
131 /* Return code 0 means it did not schedule the conn, 1
132 * means it successfully scheduled the conn.
136 kgnilnd_schedule_process_conn(kgn_conn_t *conn, int sched_intent)
140 /* move back to IDLE but save previous state.
141 * if we see WANTS_SCHED, we'll call kgnilnd_schedule_conn and
142 * let the xchg there handle any racing callers to get it
143 * onto gnd_ready_conns */
145 conn_sched = xchg(&conn->gnc_scheduled, GNILND_CONN_IDLE);
146 LASSERTF(conn_sched == GNILND_CONN_WANTS_SCHED ||
147 conn_sched == GNILND_CONN_PROCESS,
148 "conn %p after process in bad state: %d\n",
151 if (sched_intent >= 0) {
152 if ((sched_intent > 0 || (conn_sched == GNILND_CONN_WANTS_SCHED))) {
153 return kgnilnd_schedule_conn_refheld(conn, 1);
159 /* Return of 0 for conn not scheduled, 1 returned if conn was scheduled or marked
163 _kgnilnd_schedule_conn(kgn_conn_t *conn, const char *caller, int line, int refheld, int lock_held)
165 kgn_device_t *dev = conn->gnc_device;
169 sched = xchg(&conn->gnc_scheduled, GNILND_CONN_WANTS_SCHED);
170 /* we only care about the last person who marked want_sched since they
171 * are most likely the culprit
173 memcpy(conn->gnc_sched_caller, caller, sizeof(conn->gnc_sched_caller));
174 conn->gnc_sched_line = line;
175 /* if we are IDLE, add to list - only one guy sees IDLE and "wins"
176 * the chance to put it onto gnd_ready_conns.
177 * otherwise, leave marked as WANTS_SCHED and the thread that "owns"
178 * the conn in process_conns will take care of moving it back to
179 * SCHED when it is done processing */
181 if (sched == GNILND_CONN_IDLE) {
182 /* if the conn is already scheduled, we've already requested
183 * the scheduler thread wakeup */
185 /* Add a reference to the conn if we are not holding a reference
186 * already from the exisiting scheduler. We now use the same
187 * reference if we need to reschedule a conn while in a scheduler
190 kgnilnd_conn_addref(conn);
192 LASSERTF(list_empty(&conn->gnc_schedlist), "conn %p already sched state %d\n",
195 CDEBUG(D_INFO, "scheduling conn 0x%p caller %s:%d\n", conn, caller, line);
197 spin_lock(&dev->gnd_lock);
198 list_add_tail(&conn->gnc_schedlist, &dev->gnd_ready_conns);
200 spin_unlock(&dev->gnd_lock);
201 set_mb(conn->gnc_last_sched_ask, jiffies);
204 CDEBUG(D_INFO, "not scheduling conn 0x%p: %d caller %s:%d\n", conn, sched, caller, line);
208 /* make sure thread(s) going to process conns - but let it make
209 * separate decision from conn schedule */
211 kgnilnd_schedule_device(dev);
216 _kgnilnd_schedule_delay_conn(kgn_conn_t *conn)
218 kgn_device_t *dev = conn->gnc_device;
220 spin_lock(&dev->gnd_lock);
221 if (list_empty(&conn->gnc_delaylist)) {
222 list_add_tail(&conn->gnc_delaylist, &dev->gnd_delay_conns);
225 spin_unlock(&dev->gnd_lock);
227 kgnilnd_schedule_device(dev);
232 kgnilnd_schedule_dgram(kgn_device_t *dev)
236 wake = xchg(&dev->gnd_dgram_ready, GNILND_DGRAM_SCHED);
237 if (wake != GNILND_DGRAM_SCHED) {
238 wake_up(&dev->gnd_dgram_waitq);
240 CDEBUG(D_NETTRACE, "not waking: %d\n", wake);
245 kgnilnd_free_tx(kgn_tx_t *tx)
247 /* taken from kgnilnd_tx_add_state_locked */
249 LASSERTF((tx->tx_list_p == NULL &&
250 tx->tx_list_state == GNILND_TX_ALLOCD) &&
251 list_empty(&tx->tx_list),
252 "tx %p with bad state %s (list_p %p) tx_list %s\n",
253 tx, kgnilnd_tx_state2str(tx->tx_list_state), tx->tx_list_p,
254 list_empty(&tx->tx_list) ? "empty" : "not empty");
256 atomic_dec(&kgnilnd_data.kgn_ntx);
258 /* we only allocate this if we need to */
259 if (tx->tx_phys != NULL) {
260 kmem_cache_free(kgnilnd_data.kgn_tx_phys_cache, tx->tx_phys);
261 CDEBUG(D_MALLOC, "slab-freed 'tx_phys': %lu at %p.\n",
262 LNET_MAX_IOV * sizeof(gni_mem_segment_t), tx->tx_phys);
265 /* Only free the buffer if we used it */
266 if (tx->tx_buffer_copy != NULL) {
267 kgnilnd_vfree(tx->tx_buffer_copy, tx->tx_rdma_desc.length);
268 tx->tx_buffer_copy = NULL;
269 CDEBUG(D_MALLOC, "vfreed buffer2\n");
272 KGNILND_POISON(tx, 0x5a, sizeof(kgn_tx_t));
274 CDEBUG(D_MALLOC, "slab-freed 'tx': %lu at %p.\n", sizeof(*tx), tx);
275 kmem_cache_free(kgnilnd_data.kgn_tx_cache, tx);
279 kgnilnd_alloc_tx (void)
283 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_ALLOC_TX))
286 tx = kmem_cache_zalloc(kgnilnd_data.kgn_tx_cache, GFP_ATOMIC);
288 CERROR("failed to allocate tx\n");
291 CDEBUG(D_MALLOC, "slab-alloced 'tx': %lu at %p.\n",
294 /* setup everything here to minimize time under the lock */
295 tx->tx_buftype = GNILND_BUF_NONE;
296 tx->tx_msg.gnm_type = GNILND_MSG_NONE;
297 INIT_LIST_HEAD(&tx->tx_list);
298 INIT_LIST_HEAD(&tx->tx_map_list);
299 tx->tx_list_state = GNILND_TX_ALLOCD;
301 atomic_inc(&kgnilnd_data.kgn_ntx);
306 /* csum_fold needs to be run on the return value before shipping over the wire */
307 #define _kgnilnd_cksum(seed, ptr, nob) csum_partial(ptr, nob, seed)
309 /* we don't use offset as every one is passing a buffer reference that already
310 * includes the offset into the base address.
313 kgnilnd_cksum(void *ptr, size_t nob)
317 sum = csum_fold(_kgnilnd_cksum(0, ptr, nob));
319 /* don't use magic 'no checksum' value */
323 CDEBUG(D_INFO, "cksum 0x%x for ptr 0x%p sz %zu\n",
330 kgnilnd_cksum_kiov(unsigned int nkiov, struct bio_vec *kiov,
331 unsigned int offset, unsigned int nob, int dump_blob)
337 unsigned int fraglen;
343 CDEBUG(D_BUFFS, "calc cksum for kiov 0x%p nkiov %u offset %u nob %u, dump %d\n",
344 kiov, nkiov, offset, nob, dump_blob);
346 /* if loops changes, please change kgnilnd_setup_phys_buffer */
348 while (offset >= kiov->bv_len) {
349 offset -= kiov->bv_len;
355 /* ignore nob here, if nob < (bv_len - offset), kiov == 1 */
356 odd = (unsigned long) (kiov[0].bv_len - offset) & 1;
358 if ((odd || *kgnilnd_tunables.kgn_vmap_cksum) && nkiov > 1) {
359 struct page **pages = kgnilnd_data.kgn_cksum_map_pages[get_cpu()];
361 LASSERTF(pages != NULL, "NULL pages for cpu %d map_pages 0x%p\n",
362 get_cpu(), kgnilnd_data.kgn_cksum_map_pages);
364 CDEBUG(D_BUFFS, "odd %d len %u offset %u nob %u\n",
365 odd, kiov[0].bv_len, offset, nob);
367 for (i = 0; i < nkiov; i++) {
368 pages[i] = kiov[i].bv_page;
371 addr = vmap(pages, nkiov, VM_MAP, PAGE_KERNEL);
373 CNETERR("Couldn't vmap %d frags on %d bytes to avoid odd length fragment in cksum\n",
375 /* return zero to avoid killing tx - we'll just get warning on console
376 * when remote end sees zero checksum */
379 atomic_inc(&kgnilnd_data.kgn_nvmap_cksum);
381 tmpck = _kgnilnd_cksum(0, ((void *) addr + kiov[0].bv_offset +
386 kgnilnd_dump_blob(D_BUFFS, "flat kiov RDMA payload",
387 (void *)addr + kiov[0].bv_offset +
390 CDEBUG(D_BUFFS, "cksum 0x%x (+0x%x) for addr 0x%p+%u len %u offset %u\n",
391 cksum, tmpck, addr, kiov[0].bv_offset, nob, offset);
395 fraglen = min(kiov->bv_len - offset, nob);
397 /* make dang sure we don't send a bogus checksum if somehow we get
398 * an odd length fragment on anything but the last entry in a kiov -
399 * we know from kgnilnd_setup_rdma_buffer that we can't have non
400 * PAGE_SIZE pages in the middle, so if nob < PAGE_SIZE, it is the last one */
401 LASSERTF(!(fraglen&1) || (nob < PAGE_SIZE),
402 "odd fraglen %u on nkiov %d, nob %u bv_len %u offset %u kiov 0x%p\n",
403 fraglen, nkiov, nob, kiov->bv_len,
406 addr = (void *)kmap(kiov->bv_page) + kiov->bv_offset +
408 tmpck = _kgnilnd_cksum(cksum, addr, fraglen);
411 "cksum 0x%x (+0x%x) for page 0x%p+%u (0x%p) len %u offset %u\n",
412 cksum, tmpck, kiov->bv_page, kiov->bv_offset,
413 addr, fraglen, offset);
418 kgnilnd_dump_blob(D_BUFFS, "kiov cksum", addr, fraglen);
420 kunmap(kiov->bv_page);
427 /* iov must not run out before end of data */
428 LASSERTF(nob == 0 || nkiov > 0, "nob %u nkiov %u\n", nob, nkiov);
433 retsum = csum_fold(cksum);
435 /* don't use magic 'no checksum' value */
439 CDEBUG(D_BUFFS, "retsum 0x%x from cksum 0x%x\n", retsum, cksum);
445 kgnilnd_init_msg(kgn_msg_t *msg, int type, lnet_nid_t source)
447 msg->gnm_magic = GNILND_MSG_MAGIC;
448 msg->gnm_version = GNILND_MSG_VERSION;
449 msg->gnm_type = type;
450 msg->gnm_payload_len = 0;
451 msg->gnm_srcnid = source;
452 /* gnm_connstamp gets set when FMA is sent */
453 /* gnm_srcnid is set on creation via function argument
454 * The right interface/net and nid is passed in when the message
460 kgnilnd_new_tx_msg(int type, lnet_nid_t source)
462 kgn_tx_t *tx = kgnilnd_alloc_tx();
465 kgnilnd_init_msg(&tx->tx_msg, type, source);
467 CERROR("couldn't allocate new tx type %s!\n",
468 kgnilnd_msgtype2str(type));
475 kgnilnd_nak_rdma(kgn_conn_t *conn, int rx_type, int error, __u64 cookie, lnet_nid_t source) {
481 case GNILND_MSG_GET_REQ:
482 case GNILND_MSG_GET_DONE:
483 nak_type = GNILND_MSG_GET_NAK;
485 case GNILND_MSG_PUT_REQ:
486 case GNILND_MSG_PUT_ACK:
487 case GNILND_MSG_PUT_DONE:
488 nak_type = GNILND_MSG_PUT_NAK;
490 case GNILND_MSG_PUT_REQ_REV:
491 case GNILND_MSG_PUT_DONE_REV:
492 nak_type = GNILND_MSG_PUT_NAK_REV;
494 case GNILND_MSG_GET_REQ_REV:
495 case GNILND_MSG_GET_ACK_REV:
496 case GNILND_MSG_GET_DONE_REV:
497 nak_type = GNILND_MSG_GET_NAK_REV;
500 CERROR("invalid msg type %s (%d)\n",
501 kgnilnd_msgtype2str(rx_type), rx_type);
504 /* only allow NAK on error and truncate to zero */
505 LASSERTF(error <= 0, "error %d conn 0x%p, cookie %llu\n",
506 error, conn, cookie);
508 tx = kgnilnd_new_tx_msg(nak_type, source);
510 CNETERR("can't get TX to NAK RDMA to %s\n",
511 libcfs_nid2str(conn->gnc_peer->gnp_nid));
515 tx->tx_msg.gnm_u.completion.gncm_retval = error;
516 tx->tx_msg.gnm_u.completion.gncm_cookie = cookie;
517 kgnilnd_queue_tx(conn, tx);
521 kgnilnd_setup_immediate_buffer(kgn_tx_t *tx, unsigned int niov,
522 struct bio_vec *kiov,
523 unsigned int offset, unsigned int nob)
525 kgn_msg_t *msg = &tx->tx_msg;
528 /* To help save on MDDs for short messages, we'll vmap a kiov to allow
529 * gni_smsg_send to send that as the payload */
531 LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
534 tx->tx_buffer = NULL;
537 if (niov && niov > (nob >> PAGE_SHIFT))
538 niov = DIV_ROUND_UP(nob + offset + kiov->bv_offset,
541 LASSERTF(niov > 0 && niov < GNILND_MAX_IMMEDIATE/PAGE_SIZE,
542 "bad niov %d msg %p kiov %p offset %d nob%d\n",
543 niov, msg, kiov, offset, nob);
545 while (offset >= kiov->bv_len) {
546 offset -= kiov->bv_len;
551 for (i = 0; i < niov; i++) {
552 /* We can't have a bv_offset on anything but the first
553 * entry, otherwise we'll have a hole at the end of the
554 * mapping as we only map whole pages.
555 * Also, if we have a bv_len < PAGE_SIZE but we need to
556 * map more than bv_len, we will also have a whole at
557 * the end of that page which isn't allowed
559 if ((kiov[i].bv_offset != 0 && i > 0) ||
560 (kiov[i].bv_offset + kiov[i].bv_len != PAGE_SIZE &&
562 CNETERR("Can't make payload contiguous in I/O VM:page %d, offset %u, nob %u, bv_offset %u bv_len %u\n",
563 i, offset, nob, kiov->bv_offset,
567 tx->tx_imm_pages[i] = kiov[i].bv_page;
570 /* hijack tx_phys for the later unmap */
572 /* tx->phyx being equal to NULL is the signal for unmap to discern between kmap and vmap */
574 tx->tx_buffer = (void *)kmap(tx->tx_imm_pages[0]) +
575 kiov[0].bv_offset + offset;
576 atomic_inc(&kgnilnd_data.kgn_nkmap_short);
577 GNIDBG_TX(D_NET, tx, "kmapped page for %d bytes for kiov 0x%p, buffer 0x%p",
578 nob, kiov, tx->tx_buffer);
580 tx->tx_phys = vmap(tx->tx_imm_pages, niov, VM_MAP, PAGE_KERNEL);
581 if (tx->tx_phys == NULL) {
582 CNETERR("Couldn't vmap %d frags on %d bytes\n", niov, nob);
586 atomic_inc(&kgnilnd_data.kgn_nvmap_short);
587 /* make sure we take into account the kiov offset as the
588 * start of the buffer
590 tx->tx_buffer = (void *)tx->tx_phys + kiov[0].bv_offset
593 "mapped %d pages for %d bytes from kiov 0x%p to 0x%p, buffer 0x%p",
594 niov, nob, kiov, tx->tx_phys, tx->tx_buffer);
596 tx->tx_buftype = GNILND_BUF_IMMEDIATE_KIOV;
601 /* checksum payload early - it shouldn't be changing after lnd_send */
602 if (*kgnilnd_tunables.kgn_checksum >= 2) {
603 msg->gnm_payload_cksum = kgnilnd_cksum(tx->tx_buffer, nob);
604 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM2)) {
605 msg->gnm_payload_cksum += 0xe00e;
607 if (*kgnilnd_tunables.kgn_checksum_dump > 1) {
608 kgnilnd_dump_blob(D_BUFFS, "payload checksum",
612 msg->gnm_payload_cksum = 0;
619 kgnilnd_setup_phys_buffer(kgn_tx_t *tx, int nkiov, struct bio_vec *kiov,
620 unsigned int offset, unsigned int nob)
622 gni_mem_segment_t *phys;
624 unsigned int fraglen;
626 GNIDBG_TX(D_NET, tx, "niov %d kiov 0x%p offset %u nob %u", nkiov, kiov, offset, nob);
630 LASSERT(tx->tx_buftype == GNILND_BUF_NONE);
632 /* only allocate this if we are going to use it */
633 tx->tx_phys = kmem_cache_alloc(kgnilnd_data.kgn_tx_phys_cache,
635 if (tx->tx_phys == NULL) {
636 CERROR("failed to allocate tx_phys\n");
641 CDEBUG(D_MALLOC, "slab-alloced 'tx->tx_phys': %lu at %p.\n",
642 LNET_MAX_IOV * sizeof(gni_mem_segment_t), tx->tx_phys);
644 /* if loops changes, please change kgnilnd_cksum_kiov
645 * and kgnilnd_setup_immediate_buffer */
647 while (offset >= kiov->bv_len) {
648 offset -= kiov->bv_len;
654 /* at this point, kiov points to the first page that we'll actually map
655 * now that we've seeked into the koiv for offset and dropped any
656 * leading pages that fall entirely within the offset */
657 tx->tx_buftype = GNILND_BUF_PHYS_UNMAPPED;
660 /* bv_offset is start of 'valid' buffer, so index offset past that */
661 tx->tx_buffer = (void *)((unsigned long)(kiov->bv_offset + offset));
664 CDEBUG(D_NET, "tx 0x%p buffer 0x%p map start kiov 0x%p+%u niov %d offset %u\n",
665 tx, tx->tx_buffer, kiov, kiov->bv_offset, nkiov, offset);
668 fraglen = min(kiov->bv_len - offset, nob);
670 /* We can't have a bv_offset on anything but the first entry,
671 * otherwise we'll have a hole at the end of the mapping as we
672 * only map whole pages. Only the first page is allowed to
673 * have an offset - we'll add that into tx->tx_buffer and that
674 * will get used when we map in the segments (see
675 * kgnilnd_map_buffer). Also, if we have a bv_len < PAGE_SIZE
676 * but we need to map more than bv_len, we will also have a
677 * whole at the end of that page which isn't allowed
679 if ((phys != tx->tx_phys) &&
680 ((kiov->bv_offset != 0) ||
681 ((kiov->bv_len < PAGE_SIZE) && (nob > kiov->bv_len)))) {
682 CERROR("Can't make payload contiguous in I/O VM:page %d, offset %u, nob %u, bv_offset %u bv_len %u\n",
683 (int)(phys - tx->tx_phys),
684 offset, nob, kiov->bv_offset, kiov->bv_len);
689 if ((phys - tx->tx_phys) == LNET_MAX_IOV) {
690 CERROR ("payload too big (%d)\n", (int)(phys - tx->tx_phys));
695 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PHYS_SETUP)) {
701 "page 0x%p bv_offset %u bv_len %u nob %u nkiov %u offset %u\n",
702 kiov->bv_page, kiov->bv_offset, kiov->bv_len, nob, nkiov,
705 phys->address = page_to_phys(kiov->bv_page);
712 /* iov must not run out before end of data */
713 LASSERTF(nob == 0 || nkiov > 0, "nob %u nkiov %u\n", nob, nkiov);
717 tx->tx_phys_npages = phys - tx->tx_phys;
722 if (tx->tx_phys != NULL) {
723 kmem_cache_free(kgnilnd_data.kgn_tx_phys_cache, tx->tx_phys);
724 CDEBUG(D_MALLOC, "slab-freed 'tx_phys': %lu at %p.\n",
725 sizeof(*tx->tx_phys), tx->tx_phys);
732 kgnilnd_setup_rdma_buffer(kgn_tx_t *tx, unsigned int niov,
733 struct bio_vec *kiov,
734 unsigned int offset, unsigned int nob)
736 return kgnilnd_setup_phys_buffer(tx, niov, kiov, offset, nob);
739 /* kgnilnd_parse_lnet_rdma()
740 * lntmsg - message passed in from lnet.
741 * niov, kiov, offset - see lnd_t in lib-types.h for descriptions.
742 * nob - actual number of bytes to in this message.
743 * put_len - It is possible for PUTs to have a different length than the
744 * length stored in lntmsg->msg_len since LNET can adjust this
745 * length based on it's buffer size and offset.
746 * lnet_try_match_md() sets the mlength that we use to do the RDMA
750 kgnilnd_parse_lnet_rdma(struct lnet_msg *lntmsg, unsigned int *niov,
751 unsigned int *offset, unsigned int *nob,
752 struct bio_vec **kiov, int put_len)
754 /* GETs are weird, see kgnilnd_send */
755 if (lntmsg->msg_type == LNET_MSG_GET) {
756 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0) {
759 *kiov = lntmsg->msg_md->md_kiov;
761 *niov = lntmsg->msg_md->md_niov;
762 *nob = lntmsg->msg_md->md_length;
765 *kiov = lntmsg->msg_kiov;
766 *niov = lntmsg->msg_niov;
768 *offset = lntmsg->msg_offset;
773 kgnilnd_compute_rdma_cksum(kgn_tx_t *tx, int put_len)
775 unsigned int niov, offset, nob;
776 struct bio_vec *kiov;
777 struct lnet_msg *lntmsg = tx->tx_lntmsg[0];
778 int dump_cksum = (*kgnilnd_tunables.kgn_checksum_dump > 1);
780 GNITX_ASSERTF(tx, ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE) ||
781 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE) ||
782 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV) ||
783 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) ||
784 (tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV) ||
785 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV)),
786 "bad type %s", kgnilnd_msgtype2str(tx->tx_msg.gnm_type));
788 if ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV) ||
789 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV)) {
790 tx->tx_msg.gnm_payload_cksum = 0;
793 if (*kgnilnd_tunables.kgn_checksum < 3) {
794 tx->tx_msg.gnm_payload_cksum = 0;
798 GNITX_ASSERTF(tx, lntmsg, "no LNet message!", NULL);
800 kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov,
804 tx->tx_msg.gnm_payload_cksum = kgnilnd_cksum_kiov(niov, kiov, offset, nob, dump_cksum);
806 tx->tx_msg.gnm_payload_cksum = kgnilnd_cksum(tx->tx_buffer, nob);
808 kgnilnd_dump_blob(D_BUFFS, "peer RDMA payload", tx->tx_buffer, nob);
812 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM3)) {
813 tx->tx_msg.gnm_payload_cksum += 0xd00d;
817 /* kgnilnd_verify_rdma_cksum()
818 * tx - PUT_DONE/GET_DONE matched tx.
819 * rx_cksum - received checksum to compare against.
820 * put_len - see kgnilnd_parse_lnet_rdma comments.
823 kgnilnd_verify_rdma_cksum(kgn_tx_t *tx, __u16 rx_cksum, int put_len)
827 unsigned int niov, offset, nob;
828 struct bio_vec *kiov;
829 struct lnet_msg *lntmsg = tx->tx_lntmsg[0];
830 int dump_on_err = *kgnilnd_tunables.kgn_checksum_dump;
832 /* we can only match certain requests */
833 GNITX_ASSERTF(tx, ((tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) ||
834 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK) ||
835 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV) ||
836 (tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV) ||
837 (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) ||
838 (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV)),
839 "bad type %s", kgnilnd_msgtype2str(tx->tx_msg.gnm_type));
841 if ((tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ_REV) ||
842 (tx->tx_msg.gnm_type == GNILND_MSG_GET_ACK_REV)) {
847 if (*kgnilnd_tunables.kgn_checksum >= 3) {
848 GNIDBG_MSG(D_WARNING, &tx->tx_msg,
849 "no RDMA payload checksum when enabled");
854 GNITX_ASSERTF(tx, lntmsg, "no LNet message!", NULL);
856 kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov, put_len);
859 cksum = kgnilnd_cksum_kiov(niov, kiov, offset, nob, 0);
861 cksum = kgnilnd_cksum(tx->tx_buffer, nob);
864 if (cksum != rx_cksum) {
865 GNIDBG_MSG(D_NETERROR, &tx->tx_msg,
866 "Bad RDMA payload checksum (%x expected %x); "
867 "kiov 0x%p niov %d nob %u offset %u",
868 cksum, rx_cksum, kiov, niov, nob, offset);
869 switch (dump_on_err) {
872 kgnilnd_cksum_kiov(niov, kiov, offset, nob, 1);
874 kgnilnd_dump_blob(D_BUFFS, "RDMA payload",
879 libcfs_debug_dumplog();
885 /* kgnilnd_check_fma_rx will close conn, kill tx with error */
891 kgnilnd_mem_add_map_list(kgn_device_t *dev, kgn_tx_t *tx)
895 GNITX_ASSERTF(tx, list_empty(&tx->tx_map_list),
896 "already mapped!", NULL);
898 spin_lock(&dev->gnd_map_lock);
899 switch (tx->tx_buftype) {
901 GNIDBG_TX(D_EMERG, tx,
902 "SOFTWARE BUG: invalid mapping %d", tx->tx_buftype);
903 spin_unlock(&dev->gnd_map_lock);
907 case GNILND_BUF_PHYS_MAPPED:
908 bytes = tx->tx_phys_npages * PAGE_SIZE;
909 dev->gnd_map_nphys++;
910 dev->gnd_map_physnop += tx->tx_phys_npages;
914 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
915 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
916 atomic64_add(bytes, &dev->gnd_rdmaq_bytes_out);
917 GNIDBG_TX(D_NETTRACE, tx, "rdma ++ %d to %lld",
918 bytes, atomic64_read(&dev->gnd_rdmaq_bytes_out));
921 atomic_inc(&dev->gnd_n_mdd);
922 atomic64_add(bytes, &dev->gnd_nbytes_map);
924 /* clear retrans to prevent any SMSG goofiness as that code uses the same counter */
927 /* we only get here in the valid cases */
928 list_add_tail(&tx->tx_map_list, &dev->gnd_map_list);
929 dev->gnd_map_version++;
930 spin_unlock(&dev->gnd_map_lock);
934 kgnilnd_mem_del_map_list(kgn_device_t *dev, kgn_tx_t *tx)
938 GNITX_ASSERTF(tx, !list_empty(&tx->tx_map_list),
939 "not mapped!", NULL);
940 spin_lock(&dev->gnd_map_lock);
942 switch (tx->tx_buftype) {
944 GNIDBG_TX(D_EMERG, tx,
945 "SOFTWARE BUG: invalid mapping %d", tx->tx_buftype);
946 spin_unlock(&dev->gnd_map_lock);
950 case GNILND_BUF_PHYS_UNMAPPED:
951 bytes = tx->tx_phys_npages * PAGE_SIZE;
952 dev->gnd_map_nphys--;
953 dev->gnd_map_physnop -= tx->tx_phys_npages;
957 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_ACK ||
958 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
959 atomic64_sub(bytes, &dev->gnd_rdmaq_bytes_out);
960 LASSERTF(atomic64_read(&dev->gnd_rdmaq_bytes_out) >= 0,
961 "bytes_out negative! %lld\n",
962 (s64)atomic64_read(&dev->gnd_rdmaq_bytes_out));
963 GNIDBG_TX(D_NETTRACE, tx, "rdma -- %d to %lld",
964 bytes, (s64)atomic64_read(&dev->gnd_rdmaq_bytes_out));
967 atomic_dec(&dev->gnd_n_mdd);
968 atomic64_sub(bytes, &dev->gnd_nbytes_map);
970 /* we only get here in the valid cases */
971 list_del_init(&tx->tx_map_list);
972 dev->gnd_map_version++;
973 spin_unlock(&dev->gnd_map_lock);
977 kgnilnd_map_buffer(kgn_tx_t *tx)
979 kgn_conn_t *conn = tx->tx_conn;
980 kgn_device_t *dev = conn->gnc_device;
981 __u32 flags = GNI_MEM_READWRITE;
984 /* The kgnilnd_mem_register(_segments) Gemini Driver functions can
985 * be called concurrently as there are internal locks that protect
986 * any data structures or HW resources. We just need to ensure
987 * that our concurrency doesn't result in the kgn_device_t
988 * getting nuked while we are in here */
990 LASSERTF(conn != NULL, "tx %p with NULL conn, someone forgot"
991 " to set tx_conn before calling %s\n", tx, __FUNCTION__);
993 if (unlikely(CFS_FAIL_CHECK(CFS_FAIL_GNI_MAP_TX)))
996 if (*kgnilnd_tunables.kgn_bte_relaxed_ordering) {
997 flags |= GNI_MEM_RELAXED_PI_ORDERING;
1000 switch (tx->tx_buftype) {
1004 case GNILND_BUF_NONE:
1005 case GNILND_BUF_IMMEDIATE:
1006 case GNILND_BUF_IMMEDIATE_KIOV:
1007 case GNILND_BUF_PHYS_MAPPED:
1010 case GNILND_BUF_PHYS_UNMAPPED:
1011 GNITX_ASSERTF(tx, tx->tx_phys != NULL, "physical buffer not there!", NULL);
1012 rrc = kgnilnd_mem_register_segments(dev->gnd_handle,
1013 tx->tx_phys, tx->tx_phys_npages, NULL,
1014 GNI_MEM_PHYS_SEGMENTS | flags,
1016 /* could race with other uses of the map counts, but this is ok
1017 * - this needs to turn into a non-fatal error soon to allow
1018 * GART resource, etc starvation handling */
1019 if (rrc != GNI_RC_SUCCESS) {
1020 GNIDBG_TX(D_NET, tx,
1021 "Can't map %d pages: dev %d phys %u pp %u",
1022 tx->tx_phys_npages, dev->gnd_id,
1023 dev->gnd_map_nphys, dev->gnd_map_physnop);
1024 RETURN(rrc == GNI_RC_ERROR_RESOURCE ? -ENOMEM : -EINVAL);
1027 tx->tx_buftype = GNILND_BUF_PHYS_MAPPED;
1028 kgnilnd_mem_add_map_list(dev, tx);
1034 kgnilnd_add_purgatory_tx(kgn_tx_t *tx)
1036 kgn_conn_t *conn = tx->tx_conn;
1037 kgn_mdd_purgatory_t *gmp;
1039 LIBCFS_ALLOC(gmp, sizeof(*gmp));
1040 LASSERTF(gmp != NULL, "couldn't allocate MDD purgatory member;"
1041 " asserting to avoid data corruption\n");
1042 if (tx->tx_buffer_copy)
1043 gmp->gmp_map_key = tx->tx_buffer_copy_map_key;
1045 gmp->gmp_map_key = tx->tx_map_key;
1047 atomic_inc(&conn->gnc_device->gnd_n_mdd_held);
1049 /* ensure that we don't have a blank purgatory - indicating the
1050 * conn is not already on purgatory lists - we'd never recover these
1051 * MDD if that were the case */
1052 GNITX_ASSERTF(tx, conn->gnc_in_purgatory,
1053 "conn 0x%p->%s with NULL purgatory",
1054 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
1056 /* link 'er up! - only place we really need to lock for
1057 * concurrent access */
1058 spin_lock(&conn->gnc_list_lock);
1059 list_add_tail(&gmp->gmp_list, &conn->gnc_mdd_list);
1060 spin_unlock(&conn->gnc_list_lock);
1064 kgnilnd_unmap_buffer(kgn_tx_t *tx, int error)
1068 int hold_timeout = 0;
1070 /* code below relies on +1 relationship ... */
1071 BUILD_BUG_ON(GNILND_BUF_PHYS_MAPPED !=
1072 (GNILND_BUF_PHYS_UNMAPPED + 1));
1074 switch (tx->tx_buftype) {
1078 case GNILND_BUF_NONE:
1079 case GNILND_BUF_IMMEDIATE:
1080 case GNILND_BUF_PHYS_UNMAPPED:
1082 case GNILND_BUF_IMMEDIATE_KIOV:
1083 if (tx->tx_phys != NULL) {
1084 vunmap(tx->tx_phys);
1085 } else if (tx->tx_phys == NULL && tx->tx_buffer != NULL) {
1086 kunmap(tx->tx_imm_pages[0]);
1088 /* clear to prevent kgnilnd_free_tx from thinking
1089 * this is a RDMA descriptor */
1093 case GNILND_BUF_PHYS_MAPPED:
1094 LASSERT(tx->tx_conn != NULL);
1096 dev = tx->tx_conn->gnc_device;
1098 /* only want to hold if we are closing conn without
1099 * verified peer notification - the theory is that
1100 * a TX error can be communicated in all other cases */
1101 if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED &&
1102 error != -GNILND_NOPURG &&
1103 kgnilnd_check_purgatory_conn(tx->tx_conn)) {
1104 kgnilnd_add_purgatory_tx(tx);
1106 /* The timeout we give to kgni is a deadman stop only.
1107 * we are setting high to ensure we don't have the kgni timer
1108 * fire before ours fires _and_ is handled */
1109 hold_timeout = GNILND_TIMEOUT2DEADMAN;
1111 GNIDBG_TX(D_NET, tx,
1112 "dev %p delaying MDD release for %dms key %#llx.%#llx",
1113 tx->tx_conn->gnc_device, hold_timeout,
1114 tx->tx_map_key.qword1, tx->tx_map_key.qword2);
1116 if (tx->tx_buffer_copy != NULL) {
1117 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_buffer_copy_map_key, hold_timeout);
1118 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
1119 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_map_key, 0);
1120 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
1122 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &tx->tx_map_key, hold_timeout);
1123 LASSERTF(rrc == GNI_RC_SUCCESS, "rrc %d\n", rrc);
1127 kgnilnd_mem_del_map_list(dev, tx);
1133 kgnilnd_tx_done(kgn_tx_t *tx, int completion)
1135 struct lnet_msg *lntmsg0, *lntmsg1;
1136 int status0, status1;
1137 struct lnet_ni *ni = NULL;
1138 kgn_conn_t *conn = tx->tx_conn;
1140 LASSERT(!in_interrupt());
1142 lntmsg0 = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
1143 lntmsg1 = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
1146 !(tx->tx_state & GNILND_TX_QUIET_ERROR) &&
1147 !kgnilnd_conn_clean_errno(completion)) {
1148 GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg,
1149 "error %d on tx 0x%p->%s id %u/%d state %s age %ds",
1150 completion, tx, conn ?
1151 libcfs_nid2str(conn->gnc_peer->gnp_nid) : "<?>",
1152 tx->tx_id.txe_smsg_id, tx->tx_id.txe_idx,
1153 kgnilnd_tx_state2str(tx->tx_list_state),
1154 cfs_duration_sec((unsigned long)jiffies - tx->tx_qtime));
1157 /* The error codes determine if we hold onto the MDD */
1158 kgnilnd_unmap_buffer(tx, completion);
1160 /* we have to deliver a reply on lntmsg[1] for the GET, so make sure
1161 * we play nice with the error codes to avoid delivering a failed
1162 * REQUEST and then a REPLY event as well */
1164 /* return -EIO to lnet - it is the magic value for failed sends */
1165 if (tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ) {
1167 status1 = completion;
1169 status0 = status1 = completion;
1172 tx->tx_buftype = GNILND_BUF_NONE;
1173 tx->tx_msg.gnm_type = GNILND_MSG_NONE;
1175 /* lnet_finalize doesn't do anything with the *ni, so ok for us to
1176 * set NULL when we are a tx without a conn */
1178 ni = conn->gnc_peer->gnp_net->gnn_ni;
1180 spin_lock(&conn->gnc_tx_lock);
1182 LASSERTF(test_and_clear_bit(tx->tx_id.txe_idx,
1183 (volatile unsigned long *)&conn->gnc_tx_bits),
1184 "conn %p tx %p bit %d already cleared\n",
1185 conn, tx, tx->tx_id.txe_idx);
1187 LASSERTF(conn->gnc_tx_ref_table[tx->tx_id.txe_idx] != NULL,
1188 "msg_id %d already NULL\n", tx->tx_id.txe_idx);
1190 conn->gnc_tx_ref_table[tx->tx_id.txe_idx] = NULL;
1191 spin_unlock(&conn->gnc_tx_lock);
1194 kgnilnd_free_tx(tx);
1196 /* finalize AFTER freeing lnet msgs */
1198 /* warning - we should hold no locks here - calling lnet_finalize
1199 * could free up lnet credits, resulting in a call chain back into
1200 * the LND via kgnilnd_send and friends */
1202 lnet_finalize(lntmsg0, status0);
1204 if (lntmsg1 != NULL) {
1205 lnet_finalize(lntmsg1, status1);
1210 kgnilnd_txlist_done(struct list_head *txlist, int error)
1213 int err_printed = 0;
1215 if (list_empty(txlist))
1218 list_for_each_entry_safe(tx, txn, txlist, tx_list) {
1219 /* only print the first error */
1221 tx->tx_state |= GNILND_TX_QUIET_ERROR;
1222 list_del_init(&tx->tx_list);
1223 kgnilnd_tx_done(tx, error);
1228 kgnilnd_set_tx_id(kgn_tx_t *tx, kgn_conn_t *conn)
1232 spin_lock(&conn->gnc_tx_lock);
1234 /* ID zero is NOT ALLOWED!!! */
1237 id = find_next_zero_bit((unsigned long *)&conn->gnc_tx_bits,
1238 GNILND_MAX_MSG_ID, conn->gnc_next_tx);
1239 if (id == GNILND_MAX_MSG_ID) {
1240 if (conn->gnc_next_tx != 1) {
1241 /* we only searched from next_tx to end and didn't find
1242 * one, so search again from start */
1243 conn->gnc_next_tx = 1;
1246 /* couldn't find one! */
1247 spin_unlock(&conn->gnc_tx_lock);
1251 /* bump next_tx to prevent immediate reuse */
1252 conn->gnc_next_tx = id + 1;
1254 set_bit(id, (volatile unsigned long *)&conn->gnc_tx_bits);
1255 LASSERTF(conn->gnc_tx_ref_table[id] == NULL,
1256 "tx 0x%p already at id %d\n",
1257 conn->gnc_tx_ref_table[id], id);
1259 /* delay these until we have a valid ID - prevents bad clear of the bit
1260 * in kgnilnd_tx_done */
1262 tx->tx_id.txe_cqid = conn->gnc_cqid;
1264 tx->tx_id.txe_idx = id;
1265 conn->gnc_tx_ref_table[id] = tx;
1267 /* Using jiffies to help differentiate against TX reuse - with
1268 * the usual minimum of a 250HZ clock, we wrap jiffies on the same TX
1269 * if we are sending to the same node faster than 256000/sec.
1270 * To help guard against this, we OR in the tx_seq - that is 32 bits */
1272 tx->tx_id.txe_chips = (__u32)(jiffies | atomic_read(&conn->gnc_tx_seq));
1274 GNIDBG_TX(D_NET, tx, "set cookie/id/bits", NULL);
1276 spin_unlock(&conn->gnc_tx_lock);
1281 kgnilnd_tx_log_retrans(kgn_conn_t *conn, kgn_tx_t *tx)
1285 log_retrans = ((tx->tx_retrans < 25) || ((tx->tx_retrans % 25) == 0));
1287 /* we don't care about TX timeout - it could be that the network is slower
1288 * or throttled. We'll keep retranmitting - so if the network is so slow
1289 * that we fill up our mailbox, we'll keep trying to resend that msg
1290 * until we exceed the max_retrans _or_ gnc_last_rx expires, indicating
1291 * that he hasn't send us any traffic in return */
1293 /* some reasonable throttling of the debug message */
1295 unsigned long now = jiffies;
1296 /* XXX Nic: Mystical TX debug here... */
1297 /* We expect retransmissions so only log when D_NET is enabled */
1298 GNIDBG_SMSG_CREDS(D_NET, conn);
1299 GNIDBG_TOMSG(D_NET, &tx->tx_msg,
1300 "NOT_DONE on conn 0x%p->%s id %x retrans %d wait %dus"
1301 " last_msg %uus/%uus last_cq %uus/%uus",
1302 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1303 tx->tx_id, tx->tx_retrans,
1304 jiffies_to_usecs(now - tx->tx_cred_wait),
1305 jiffies_to_usecs(now - conn->gnc_last_tx),
1306 jiffies_to_usecs(now - conn->gnc_last_rx),
1307 jiffies_to_usecs(now - conn->gnc_last_tx_cq),
1308 jiffies_to_usecs(now - conn->gnc_last_rx_cq));
1312 /* caller must be holding gnd_cq_mutex and not unlock it afterwards, as we need to drop it
1313 * to avoid bad ordering with state_lock */
1316 kgnilnd_sendmsg_nolock(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
1317 spinlock_t *state_lock, kgn_tx_list_state_t state)
1319 kgn_conn_t *conn = tx->tx_conn;
1320 kgn_msg_t *msg = &tx->tx_msg;
1322 unsigned long newest_last_rx, timeout;
1325 LASSERTF((msg->gnm_type == GNILND_MSG_IMMEDIATE) ?
1326 immediatenob <= *kgnilnd_tunables.kgn_max_immediate :
1328 "msg 0x%p type %d wrong payload size %d\n",
1329 msg, msg->gnm_type, immediatenob);
1331 /* make sure we catch all the cases where we'd send on a dirty old mbox
1332 * but allow case for sending CLOSE. Since this check is within the CQ
1333 * mutex barrier and the close message is only sent through
1334 * kgnilnd_send_conn_close the last message out the door will be the
1337 if (atomic_read(&conn->gnc_peer->gnp_dirty_eps) != 0 && msg->gnm_type != GNILND_MSG_CLOSE) {
1338 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1339 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1340 /* Return -ETIME, we are closing the connection already so we dont want to
1341 * have this tx hit the wire. The tx will be killed by the calling function.
1342 * Once the EP is marked dirty the close message will be the last
1343 * thing to hit the wire */
1348 timeout = cfs_time_seconds(conn->gnc_timeout);
1350 newest_last_rx = GNILND_LASTRX(conn);
1352 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SEND_TIMEOUT)) {
1353 now = now + (GNILND_TIMEOUTRX(timeout) * 2);
1356 if (time_after_eq(now, newest_last_rx + GNILND_TIMEOUTRX(timeout))) {
1357 GNIDBG_CONN(D_NETERROR|D_CONSOLE, conn,
1358 "Cant send to %s after timeout lapse of %lu; TO %lu\n",
1359 libcfs_nid2str(conn->gnc_peer->gnp_nid),
1360 cfs_duration_sec(now - newest_last_rx),
1361 cfs_duration_sec(GNILND_TIMEOUTRX(timeout)));
1362 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1363 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1367 GNITX_ASSERTF(tx, (conn != NULL) && (tx->tx_id.txe_idx != 0), "tx id unset!", NULL);
1368 /* msg->gnm_srcnid is set when the message is initialized by whatever function is
1369 * creating the message this allows the message to contain the correct LNET NID/NET needed
1370 * instead of the one that the peer/conn uses for sending the data.
1372 msg->gnm_connstamp = conn->gnc_my_connstamp;
1373 msg->gnm_payload_len = immediatenob;
1374 msg->gnm_seq = atomic_read(&conn->gnc_tx_seq);
1376 /* always init here - kgn_checksum is a /sys module tunable
1377 * and can be flipped at any point, even between msg init and sending */
1379 if (*kgnilnd_tunables.kgn_checksum) {
1380 /* We must set here and not in kgnilnd_init_msg,
1381 * we could resend this msg many times
1382 * (NOT_DONE from gni_smsg_send below) and wouldn't pass
1383 * through init_msg again */
1384 msg->gnm_cksum = kgnilnd_cksum(msg, sizeof(kgn_msg_t));
1385 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_SMSG_CKSUM1)) {
1386 msg->gnm_cksum += 0xf00f;
1390 GNIDBG_TOMSG(D_NET, msg, "tx 0x%p conn 0x%p->%s sending SMSG sz %u id %x/%d [%p for %u]",
1391 tx, conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
1392 sizeof(kgn_msg_t), tx->tx_id.txe_smsg_id,
1393 tx->tx_id.txe_idx, immediate, immediatenob);
1395 if (unlikely(tx->tx_state & GNILND_TX_FAIL_SMSG)) {
1396 rrc = cfs_fail_val ? cfs_fail_val : GNI_RC_NOT_DONE;
1398 rrc = kgnilnd_smsg_send(conn->gnc_ephandle,
1399 msg, sizeof(*msg), immediate,
1401 tx->tx_id.txe_smsg_id);
1405 case GNI_RC_SUCCESS:
1406 atomic_inc(&conn->gnc_tx_seq);
1407 conn->gnc_last_tx = jiffies;
1408 /* no locking here as LIVE isn't a list */
1409 kgnilnd_tx_add_state_locked(tx, NULL, conn, GNILND_TX_LIVE_FMAQ, 1);
1411 /* this needs to be checked under lock as it might be freed from a completion
1414 if (msg->gnm_type == GNILND_MSG_NOOP) {
1415 set_mb(conn->gnc_last_noop_sent, jiffies);
1418 /* serialize with seeing CQ events for completion on this, as well as
1420 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1421 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1423 atomic_inc(&conn->gnc_device->gnd_short_ntx);
1424 atomic64_add(immediatenob, &conn->gnc_device->gnd_short_txbytes);
1425 kgnilnd_peer_alive(conn->gnc_peer);
1426 GNIDBG_SMSG_CREDS(D_NET, conn);
1429 case GNI_RC_NOT_DONE:
1430 /* Jshimek: We can get GNI_RC_NOT_DONE for 3 reasons currently
1431 * 1: out of mbox credits
1432 * 2: out of mbox payload credits
1433 * 3: On Aries out of dla credits
1435 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1436 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1437 /* We'll handle this error inline - makes the calling logic much more
1440 /* If no lock, caller doesn't want us to retry */
1441 if (state_lock == NULL) {
1445 /* I need kgni credits to send this. Replace tx at the head of the
1446 * fmaq and I'll get rescheduled when credits appear. Reset the tx_state
1447 * and bump retrans counts since we are requeueing the tx.
1451 conn->gnc_tx_retrans++;
1453 kgnilnd_tx_log_retrans(conn, tx);
1454 /* add to head of list for the state and retries */
1455 spin_lock(state_lock);
1456 kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, state, 0);
1457 spin_unlock(state_lock);
1459 /* We only reschedule for a certain number of retries, then
1460 * we will wait for the CQ events indicating a release of SMSG
1462 if (tx->tx_retrans < *kgnilnd_tunables.kgn_max_retransmits) {
1463 kgnilnd_schedule_conn(conn);
1466 /* CQ event coming in signifies either TX completed or
1467 * RX receive. Either of these *could* free up credits
1468 * in the SMSG mbox and we should try sending again */
1469 GNIDBG_TX(D_NET, tx, "waiting for CQID %u event to resend",
1470 tx->tx_conn->gnc_cqid);
1471 kgnilnd_schedule_delay_conn(conn);
1472 /* use +ve return code to let upper layers know they
1473 * should stop looping on sends */
1477 /* handle bad retcode gracefully */
1478 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
1479 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1484 /* kgnilnd_sendmsg has hard wait on gnd_cq_mutex */
1486 kgnilnd_sendmsg(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
1487 spinlock_t *state_lock, kgn_tx_list_state_t state)
1489 kgn_device_t *dev = tx->tx_conn->gnc_device;
1490 unsigned long timestamp;
1493 timestamp = jiffies;
1494 kgnilnd_gl_mutex_lock(&dev->gnd_cq_mutex);
1495 kgnilnd_conn_mutex_lock(&tx->tx_conn->gnc_smsg_mutex);
1496 /* delay in jiffies - we are really concerned only with things that
1497 * result in a schedule() or really holding this off for long times .
1498 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
1499 dev->gnd_mutex_delay += (long) jiffies - timestamp;
1501 rc = kgnilnd_sendmsg_nolock(tx, immediate, immediatenob, state_lock, state);
1507 /* returns -EAGAIN for lock miss, anything else < 0 is hard error, >=0 for success */
1509 kgnilnd_sendmsg_trylock(kgn_tx_t *tx, void *immediate, unsigned int immediatenob,
1510 spinlock_t *state_lock, kgn_tx_list_state_t state)
1512 kgn_conn_t *conn = tx->tx_conn;
1513 kgn_device_t *dev = conn->gnc_device;
1514 unsigned long timestamp;
1517 timestamp = jiffies;
1519 /* technically we are doing bad things with the read_lock on the peer_conn
1520 * table, but we shouldn't be sleeping inside here - and we don't sleep/block
1521 * for the mutex. I bet lockdep is gonna flag this one though... */
1523 /* there are a few cases where we don't want the immediate send - like
1524 * when we are in the scheduler thread and it'd harm the latency of
1525 * getting messages up to LNet */
1527 /* rmb for gnd_ready */
1529 if (conn->gnc_device->gnd_ready == GNILND_DEV_LOOP) {
1531 atomic_inc(&conn->gnc_device->gnd_fast_block);
1532 } else if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
1533 /* dont hit HW during quiesce */
1535 } else if (unlikely(atomic_read(&conn->gnc_peer->gnp_dirty_eps))) {
1536 /* dont hit HW if stale EPs and conns left to close */
1539 atomic_inc(&conn->gnc_device->gnd_fast_try);
1540 rc = kgnilnd_trylock(&conn->gnc_device->gnd_cq_mutex,
1541 &conn->gnc_smsg_mutex);
1546 /* we got the mutex and weren't blocked */
1548 /* delay in jiffies - we are really concerned only with things that
1549 * result in a schedule() or really holding this off for long times .
1550 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
1551 dev->gnd_mutex_delay += (long) jiffies - timestamp;
1553 atomic_inc(&conn->gnc_device->gnd_fast_ok);
1554 tx->tx_qtime = jiffies;
1555 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
1556 rc = kgnilnd_sendmsg_nolock(tx, tx->tx_buffer, tx->tx_nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
1557 /* _nolock unlocks the mutex for us */
1563 /* lets us know if we can push this RDMA through now */
1565 kgnilnd_auth_rdma_bytes(kgn_device_t *dev, kgn_tx_t *tx)
1569 bytes_left = atomic64_sub_return(tx->tx_nob, &dev->gnd_rdmaq_bytes_ok);
1571 if (bytes_left < 0) {
1572 atomic64_add(tx->tx_nob, &dev->gnd_rdmaq_bytes_ok);
1573 atomic_inc(&dev->gnd_rdmaq_nstalls);
1576 CDEBUG(D_NET, "no bytes to send, turning on timer for %lu\n",
1577 dev->gnd_rdmaq_deadline);
1578 mod_timer(&dev->gnd_rdmaq_timer, dev->gnd_rdmaq_deadline);
1579 /* we never del this timer - at worst it schedules us.. */
1586 /* this adds a TX to the queue pending throttling authorization before
1587 * we allow our remote peer to launch a PUT at us */
1589 kgnilnd_queue_rdma(kgn_conn_t *conn, kgn_tx_t *tx)
1593 /* we cannot go into send_mapped_tx from here as we are holding locks
1594 * and mem registration might end up allocating memory in kgni.
1595 * That said, we'll push this as far as we can into the queue process */
1596 rc = kgnilnd_auth_rdma_bytes(conn->gnc_device, tx);
1599 spin_lock(&conn->gnc_device->gnd_rdmaq_lock);
1600 kgnilnd_tx_add_state_locked(tx, NULL, conn, GNILND_TX_RDMAQ, 0);
1601 /* lets us know how delayed RDMA is */
1602 tx->tx_qtime = jiffies;
1603 spin_unlock(&conn->gnc_device->gnd_rdmaq_lock);
1605 /* we have RDMA authorized, now it just needs a MDD and to hit the wire */
1606 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
1607 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 0);
1608 /* lets us know how delayed mapping is */
1609 tx->tx_qtime = jiffies;
1610 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
1613 /* make sure we wake up sched to run this */
1614 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
1617 /* push TX through state machine */
1619 kgnilnd_queue_tx(kgn_conn_t *conn, kgn_tx_t *tx)
1624 /* set the tx_id here, we delay it until we have an actual conn
1626 * in some cases, the tx_id is already set to provide for things
1627 * like RDMA completion cookies, etc */
1628 if (tx->tx_id.txe_idx == 0) {
1629 rc = kgnilnd_set_tx_id(tx, conn);
1631 kgnilnd_tx_done(tx, rc);
1636 CDEBUG(D_NET, "%s to conn %p for %s\n", kgnilnd_msgtype2str(tx->tx_msg.gnm_type),
1637 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
1639 /* Only let NOOPs to be sent while fail loc is set, otherwise kill the tx.
1641 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_ONLY_NOOP) && (tx->tx_msg.gnm_type != GNILND_MSG_NOOP)) {
1642 kgnilnd_tx_done(tx, rc);
1646 switch (tx->tx_msg.gnm_type) {
1647 case GNILND_MSG_PUT_ACK:
1648 case GNILND_MSG_GET_REQ:
1649 case GNILND_MSG_PUT_REQ_REV:
1650 case GNILND_MSG_GET_ACK_REV:
1651 /* hijacking time! If this messages will authorize our peer to
1652 * send his dirty little bytes in an RDMA, we need to get permission */
1653 kgnilnd_queue_rdma(conn, tx);
1655 case GNILND_MSG_IMMEDIATE:
1656 /* try to send right now, can help reduce latency */
1657 rc = kgnilnd_sendmsg_trylock(tx, tx->tx_buffer, tx->tx_nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
1660 /* it was sent, break out of switch to avoid default case of queueing */
1663 /* needs to queue to try again, so... */
1664 /* fall through... */
1665 case GNILND_MSG_NOOP:
1666 /* Just make sure this goes out first for this conn */
1668 /* fall through... */
1670 spin_lock(&conn->gnc_list_lock);
1671 kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, GNILND_TX_FMAQ, add_tail);
1672 tx->tx_qtime = jiffies;
1673 spin_unlock(&conn->gnc_list_lock);
1674 kgnilnd_schedule_conn(conn);
1679 kgnilnd_launch_tx(kgn_tx_t *tx, kgn_net_t *net, struct lnet_process_id *target)
1682 kgn_peer_t *new_peer = NULL;
1683 kgn_conn_t *conn = NULL;
1689 /* If I get here, I've committed to send, so I complete the tx with
1690 * failure on any problems */
1692 GNITX_ASSERTF(tx, tx->tx_conn == NULL,
1693 "tx already has connection %p", tx->tx_conn);
1695 /* do all of the peer & conn searching in one swoop - this avoids
1696 * nastiness when dropping locks and needing to maintain a sane state
1697 * in the face of stack reset or something else nuking peers & conns */
1699 /* I expect to find him, so only take a read lock */
1700 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
1702 peer = kgnilnd_find_peer_locked(target->nid);
1704 conn = kgnilnd_find_conn_locked(peer);
1705 /* this could be NULL during quiesce */
1707 /* Connection exists; queue message on it */
1708 kgnilnd_queue_tx(conn, tx);
1709 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1713 /* don't create a connection if the peer is marked down */
1714 if (peer->gnp_state != GNILND_PEER_UP) {
1715 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1721 /* creating peer or conn; I'll need a write lock... */
1722 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1724 CFS_RACE(CFS_FAIL_GNI_FIND_TARGET);
1726 node_state = kgnilnd_get_node_state(LNET_NIDADDR(target->nid));
1728 /* NB - this will not block during normal operations -
1729 * the only writer of this is in the startup/shutdown path. */
1730 rc = down_read_trylock(&kgnilnd_data.kgn_net_rw_sem);
1736 /* ignore previous peer entirely - we cycled the lock, so we
1737 * will create new peer and at worst drop it if peer is still
1739 rc = kgnilnd_create_peer_safe(&new_peer, target->nid, net, node_state);
1741 up_read(&kgnilnd_data.kgn_net_rw_sem);
1745 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1746 up_read(&kgnilnd_data.kgn_net_rw_sem);
1748 /* search for peer again now that we have the lock
1749 * if we don't find it, add our new one to the list */
1750 kgnilnd_add_peer_locked(target->nid, new_peer, &peer);
1752 /* don't create a connection if the peer is not up */
1753 if (peer->gnp_state != GNILND_PEER_UP) {
1754 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1759 conn = kgnilnd_find_or_create_conn_locked(peer);
1761 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DGRAM_DROP_TX)) {
1762 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1767 /* oh hey, found a conn now... magical */
1768 kgnilnd_queue_tx(conn, tx);
1770 /* no conn, must be trying to connect - so we queue for now */
1771 tx->tx_qtime = jiffies;
1772 kgnilnd_tx_add_state_locked(tx, peer, NULL, GNILND_TX_PEERQ, 1);
1774 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1777 kgnilnd_tx_done(tx, rc);
1782 kgnilnd_rdma(kgn_tx_t *tx, int type,
1783 kgn_rdma_desc_t *sink, unsigned int nob, __u64 cookie)
1785 kgn_conn_t *conn = tx->tx_conn;
1786 unsigned long timestamp;
1787 gni_post_type_t post_type;
1790 unsigned int desc_nob = nob;
1791 void *desc_buffer = tx->tx_buffer;
1792 gni_mem_handle_t desc_map_key = tx->tx_map_key;
1793 LASSERTF(kgnilnd_tx_mapped(tx),
1794 "unmapped tx %p\n", tx);
1795 LASSERTF(conn != NULL,
1796 "NULL conn on tx %p, naughty, naughty\n", tx);
1797 LASSERTF(nob <= sink->gnrd_nob,
1798 "nob %u > sink->gnrd_nob %d (%p)\n",
1799 nob, sink->gnrd_nob, sink);
1800 LASSERTF(nob <= tx->tx_nob,
1801 "nob %d > tx(%p)->tx_nob %d\n",
1802 nob, tx, tx->tx_nob);
1805 case GNILND_MSG_GET_DONE:
1806 case GNILND_MSG_PUT_DONE:
1807 post_type = GNI_POST_RDMA_PUT;
1809 case GNILND_MSG_GET_DONE_REV:
1810 case GNILND_MSG_PUT_DONE_REV:
1811 post_type = GNI_POST_RDMA_GET;
1814 CERROR("invalid msg type %s (%d)\n",
1815 kgnilnd_msgtype2str(type), type);
1818 if (post_type == GNI_POST_RDMA_GET) {
1819 /* Check for remote buffer / local buffer / length alignment. All must be 4 byte
1820 * aligned. If the local buffer is not aligned correctly using the copy buffer
1821 * will fix that issue. If length is misaligned copy buffer will also fix the issue, we end
1822 * up transferring extra bytes into the buffer but only copy the correct nob into the original
1823 * buffer. Remote offset correction is done through a combination of adjusting the offset,
1824 * making sure the length and addr are aligned and copying the data into the correct location
1825 * once the transfer has completed.
1827 if ((((__u64)((unsigned long)tx->tx_buffer)) & 3) ||
1828 (sink->gnrd_addr & 3) ||
1831 tx->tx_offset = ((__u64)((unsigned long)sink->gnrd_addr)) & 3;
1833 atomic_inc(&kgnilnd_data.kgn_rev_offset);
1835 if ((nob + tx->tx_offset) & 3) {
1836 desc_nob = ((nob + tx->tx_offset) + (4 - ((nob + tx->tx_offset) & 3)));
1837 atomic_inc(&kgnilnd_data.kgn_rev_length);
1839 desc_nob = (nob + tx->tx_offset);
1842 if (tx->tx_buffer_copy == NULL) {
1843 /* Allocate the largest copy buffer we will need, this will prevent us from overwriting data
1844 * and require at most we allocate a few extra bytes. */
1845 tx->tx_buffer_copy = kgnilnd_vzalloc(desc_nob);
1847 if (!tx->tx_buffer_copy) {
1848 /* allocation of buffer failed nak the rdma */
1849 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type, -EFAULT, cookie, tx->tx_msg.gnm_srcnid);
1850 kgnilnd_tx_done(tx, -EFAULT);
1853 atomic_inc(&kgnilnd_data.kgn_rev_copy_buff);
1854 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);
1855 if (rc != GNI_RC_SUCCESS) {
1856 /* Registration Failed nak rdma and kill the tx. */
1857 kgnilnd_vfree(tx->tx_buffer_copy,
1859 tx->tx_buffer_copy = NULL;
1860 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type, -EFAULT, cookie, tx->tx_msg.gnm_srcnid);
1861 kgnilnd_tx_done(tx, -EFAULT);
1865 desc_map_key = tx->tx_buffer_copy_map_key;
1866 desc_buffer = tx->tx_buffer_copy;
1870 memset(&tx->tx_rdma_desc, 0, sizeof(tx->tx_rdma_desc));
1871 tx->tx_rdma_desc.post_id = tx->tx_id.txe_cookie;
1872 tx->tx_rdma_desc.type = post_type;
1873 tx->tx_rdma_desc.cq_mode = GNI_CQMODE_GLOBAL_EVENT;
1874 tx->tx_rdma_desc.local_addr = (__u64)((unsigned long)desc_buffer);
1875 tx->tx_rdma_desc.local_mem_hndl = desc_map_key;
1876 tx->tx_rdma_desc.remote_addr = sink->gnrd_addr - tx->tx_offset;
1877 tx->tx_rdma_desc.remote_mem_hndl = sink->gnrd_key;
1878 tx->tx_rdma_desc.length = desc_nob;
1879 tx->tx_nob_rdma = nob;
1880 if (post_type == GNI_POST_RDMA_PUT && *kgnilnd_tunables.kgn_bte_put_dlvr_mode)
1881 tx->tx_rdma_desc.dlvr_mode = *kgnilnd_tunables.kgn_bte_put_dlvr_mode;
1882 if (post_type == GNI_POST_RDMA_GET && *kgnilnd_tunables.kgn_bte_get_dlvr_mode)
1883 tx->tx_rdma_desc.dlvr_mode = *kgnilnd_tunables.kgn_bte_get_dlvr_mode;
1884 /* prep final completion message */
1885 kgnilnd_init_msg(&tx->tx_msg, type, tx->tx_msg.gnm_srcnid);
1886 tx->tx_msg.gnm_u.completion.gncm_cookie = cookie;
1887 /* send actual size RDMA'd in retval */
1888 tx->tx_msg.gnm_u.completion.gncm_retval = nob;
1890 kgnilnd_compute_rdma_cksum(tx, nob);
1893 kgnilnd_queue_tx(conn, tx);
1897 /* Don't lie (CLOSE == RDMA idle) */
1898 LASSERTF(!conn->gnc_close_sent, "tx %p on conn %p after close sent %d\n",
1899 tx, conn, conn->gnc_close_sent);
1901 GNIDBG_TX(D_NET, tx, "Post RDMA type 0x%02x conn %p dlvr_mode "
1902 "0x%x cookie:%#llx",
1903 type, conn, tx->tx_rdma_desc.dlvr_mode, cookie);
1905 /* set CQ dedicated for RDMA */
1906 tx->tx_rdma_desc.src_cq_hndl = conn->gnc_device->gnd_snd_rdma_cqh;
1908 timestamp = jiffies;
1909 kgnilnd_conn_mutex_lock(&conn->gnc_rdma_mutex);
1910 kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
1911 /* delay in jiffies - we are really concerned only with things that
1912 * result in a schedule() or really holding this off for long times .
1913 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
1914 conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
1916 rrc = kgnilnd_post_rdma(conn->gnc_ephandle, &tx->tx_rdma_desc);
1918 if (rrc == GNI_RC_ERROR_RESOURCE) {
1919 kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
1920 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1921 kgnilnd_unmap_buffer(tx, 0);
1923 if (tx->tx_buffer_copy != NULL) {
1924 kgnilnd_vfree(tx->tx_buffer_copy, desc_nob);
1925 tx->tx_buffer_copy = NULL;
1928 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
1929 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn,
1931 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
1932 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
1936 spin_lock(&conn->gnc_list_lock);
1937 kgnilnd_tx_add_state_locked(tx, conn->gnc_peer, conn, GNILND_TX_LIVE_RDMAQ, 1);
1938 tx->tx_qtime = jiffies;
1939 spin_unlock(&conn->gnc_list_lock);
1940 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1941 kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
1943 /* XXX Nic: is this a place we should handle more errors for
1944 * robustness sake */
1945 LASSERT(rrc == GNI_RC_SUCCESS);
1950 kgnilnd_alloc_rx(void)
1954 rx = kmem_cache_alloc(kgnilnd_data.kgn_rx_cache, GFP_ATOMIC);
1956 CERROR("failed to allocate rx\n");
1959 CDEBUG(D_MALLOC, "slab-alloced 'rx': %lu at %p.\n",
1962 /* no memset to zero, we'll always fill all members */
1966 /* release is to just free connection resources
1967 * we use this for the eager path after copying */
1969 kgnilnd_release_msg(kgn_conn_t *conn)
1972 unsigned long timestamp;
1974 CDEBUG(D_NET, "consuming %p\n", conn);
1976 timestamp = jiffies;
1977 kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
1978 /* delay in jiffies - we are really concerned only with things that
1979 * result in a schedule() or really holding this off for long times .
1980 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
1981 conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
1983 rrc = kgnilnd_smsg_release(conn->gnc_ephandle);
1984 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
1986 LASSERTF(rrc == GNI_RC_SUCCESS, "bad rrc %d\n", rrc);
1987 GNIDBG_SMSG_CREDS(D_NET, conn);
1989 kgnilnd_schedule_conn(conn);
1993 kgnilnd_consume_rx(kgn_rx_t *rx)
1995 kgn_conn_t *conn = rx->grx_conn;
1996 kgn_msg_t *rxmsg = rx->grx_msg;
1998 /* if we are eager, free the cache alloc'd msg */
1999 if (unlikely(rx->grx_eager)) {
2000 LIBCFS_FREE(rxmsg, sizeof(*rxmsg) + *kgnilnd_tunables.kgn_max_immediate);
2001 atomic_dec(&kgnilnd_data.kgn_neager_allocs);
2003 /* release ref from eager_recv */
2004 kgnilnd_conn_decref(conn);
2006 GNIDBG_MSG(D_NET, rxmsg, "rx %p processed", rx);
2007 kgnilnd_release_msg(conn);
2010 kmem_cache_free(kgnilnd_data.kgn_rx_cache, rx);
2011 CDEBUG(D_MALLOC, "slab-freed 'rx': %lu at %p.\n",
2016 kgnilnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
2018 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
2019 int type = lntmsg->msg_type;
2020 struct lnet_process_id target = lntmsg->msg_target;
2021 int target_is_router = lntmsg->msg_target_is_router;
2022 int routing = lntmsg->msg_routing;
2023 unsigned int niov = lntmsg->msg_niov;
2024 struct bio_vec *kiov = lntmsg->msg_kiov;
2025 unsigned int offset = lntmsg->msg_offset;
2026 unsigned int nob = lntmsg->msg_len;
2027 unsigned int msg_vmflush = lntmsg->msg_vmflush;
2028 kgn_net_t *net = ni->ni_data;
2031 /* '1' for consistency with code that checks !mpflag to restore */
2032 unsigned int mpflag = 1;
2033 int reverse_rdma_flag = *kgnilnd_tunables.kgn_reverse_rdma;
2035 /* NB 'private' is different depending on what we're sending.... */
2036 LASSERT(!in_interrupt());
2038 CDEBUG(D_NET, "sending msg type %d with %d bytes in %d frags to %s\n",
2039 type, nob, niov, libcfs_id2str(target));
2041 LASSERTF(nob == 0 || niov > 0,
2042 "lntmsg %p nob %d niov %d\n", lntmsg, nob, niov);
2043 LASSERTF(niov <= LNET_MAX_IOV,
2044 "lntmsg %p niov %d\n", lntmsg, niov);
2047 mpflag = memalloc_noreclaim_save();
2051 CERROR("lntmsg %p with unexpected type %d\n",
2056 LASSERTF(nob == 0, "lntmsg %p nob %d\n",
2064 if (routing || target_is_router)
2065 break; /* send IMMEDIATE */
2067 /* it is safe to do direct GET with out mapping buffer for RDMA as we
2068 * check the eventual sink buffer here - if small enough, remote
2069 * end is perfectly capable of returning data in short message -
2070 * The magic is that we call lnet_parse in kgnilnd_recv with rdma_req=0
2071 * for IMMEDIATE messages which will have it send a real reply instead
2072 * of doing kgnilnd_recv to have the RDMA continued */
2073 if (lntmsg->msg_md->md_length <= *kgnilnd_tunables.kgn_max_immediate)
2076 if ((reverse_rdma_flag & GNILND_REVERSE_GET) == 0)
2077 tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_REQ, ni->ni_nid);
2079 tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_REQ_REV, ni->ni_nid);
2085 rc = kgnilnd_setup_rdma_buffer(tx, lntmsg->msg_md->md_niov,
2086 lntmsg->msg_md->md_kiov,
2087 0, lntmsg->msg_md->md_length);
2089 CERROR("unable to setup buffer: %d\n", rc);
2090 kgnilnd_tx_done(tx, rc);
2095 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
2096 if (tx->tx_lntmsg[1] == NULL) {
2097 CERROR("Can't create reply for GET to %s\n",
2098 libcfs_nid2str(target.nid));
2099 kgnilnd_tx_done(tx, rc);
2104 tx->tx_lntmsg[0] = lntmsg;
2105 if ((reverse_rdma_flag & GNILND_REVERSE_GET) == 0)
2106 tx->tx_msg.gnm_u.get.gngm_hdr = *hdr;
2108 tx->tx_msg.gnm_u.putreq.gnprm_hdr = *hdr;
2110 /* rest of tx_msg is setup just before it is sent */
2111 kgnilnd_launch_tx(tx, net, &target);
2113 case LNET_MSG_REPLY:
2115 /* to save on MDDs, we'll handle short kiov by vmap'ing
2116 * and sending via SMSG */
2117 if (nob <= *kgnilnd_tunables.kgn_max_immediate)
2120 if ((reverse_rdma_flag & GNILND_REVERSE_PUT) == 0)
2121 tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_REQ, ni->ni_nid);
2123 tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_REQ_REV, ni->ni_nid);
2130 rc = kgnilnd_setup_rdma_buffer(tx, niov,
2133 kgnilnd_tx_done(tx, rc);
2138 tx->tx_lntmsg[0] = lntmsg;
2139 if ((reverse_rdma_flag & GNILND_REVERSE_PUT) == 0)
2140 tx->tx_msg.gnm_u.putreq.gnprm_hdr = *hdr;
2142 tx->tx_msg.gnm_u.get.gngm_hdr = *hdr;
2144 /* rest of tx_msg is setup just before it is sent */
2145 kgnilnd_launch_tx(tx, net, &target);
2149 /* send IMMEDIATE */
2151 LASSERTF(nob <= *kgnilnd_tunables.kgn_max_immediate,
2152 "lntmsg 0x%p too large %d\n", lntmsg, nob);
2154 tx = kgnilnd_new_tx_msg(GNILND_MSG_IMMEDIATE, ni->ni_nid);
2160 rc = kgnilnd_setup_immediate_buffer(tx, niov, kiov, offset, nob);
2162 kgnilnd_tx_done(tx, rc);
2166 tx->tx_msg.gnm_u.immediate.gnim_hdr = *hdr;
2167 tx->tx_lntmsg[0] = lntmsg;
2168 kgnilnd_launch_tx(tx, net, &target);
2171 /* use stored value as we could have already finalized lntmsg here from a failed launch */
2173 memalloc_noreclaim_restore(mpflag);
2178 kgnilnd_setup_rdma(struct lnet_ni *ni, kgn_rx_t *rx, struct lnet_msg *lntmsg, int mlen)
2180 kgn_conn_t *conn = rx->grx_conn;
2181 kgn_msg_t *rxmsg = rx->grx_msg;
2182 unsigned int niov = lntmsg->msg_niov;
2183 struct bio_vec *kiov = lntmsg->msg_kiov;
2184 unsigned int offset = lntmsg->msg_offset;
2185 unsigned int nob = lntmsg->msg_len;
2190 switch (rxmsg->gnm_type) {
2191 case GNILND_MSG_PUT_REQ_REV:
2192 done_type = GNILND_MSG_PUT_DONE_REV;
2195 case GNILND_MSG_GET_REQ:
2196 done_type = GNILND_MSG_GET_DONE;
2199 CERROR("invalid msg type %s (%d)\n",
2200 kgnilnd_msgtype2str(rxmsg->gnm_type),
2205 tx = kgnilnd_new_tx_msg(done_type, ni->ni_nid);
2209 rc = kgnilnd_set_tx_id(tx, conn);
2213 rc = kgnilnd_setup_rdma_buffer(tx, niov, kiov, offset, nob);
2217 tx->tx_lntmsg[0] = lntmsg;
2218 tx->tx_getinfo = rxmsg->gnm_u.get;
2220 /* we only queue from kgnilnd_recv - we might get called from other contexts
2221 * and we don't want to block the mutex in those cases */
2223 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2224 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
2225 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2226 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2231 kgnilnd_tx_done(tx, rc);
2232 kgnilnd_nak_rdma(conn, done_type, rc, rxmsg->gnm_u.get.gngm_cookie, ni->ni_nid);
2234 lnet_finalize(lntmsg, rc);
2238 kgnilnd_eager_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
2241 kgn_rx_t *rx = private;
2242 kgn_conn_t *conn = rx->grx_conn;
2243 kgn_msg_t *rxmsg = rx->grx_msg;
2244 kgn_msg_t *eagermsg = NULL;
2245 kgn_peer_t *peer = NULL;
2246 kgn_conn_t *found_conn = NULL;
2248 GNIDBG_MSG(D_NET, rxmsg, "eager recv for conn %p, rxmsg %p, lntmsg %p",
2249 conn, rxmsg, lntmsg);
2251 if (rxmsg->gnm_payload_len > *kgnilnd_tunables.kgn_max_immediate) {
2252 GNIDBG_MSG(D_ERROR, rxmsg, "payload too large %d",
2253 rxmsg->gnm_payload_len);
2256 /* Grab a read lock so the connection doesnt disappear on us
2257 * while we look it up
2259 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
2261 peer = kgnilnd_find_peer_locked(rxmsg->gnm_srcnid);
2263 found_conn = kgnilnd_find_conn_locked(peer);
2266 /* Verify the connection found is the same one that the message
2267 * is supposed to be using, if it is not output an error message
2270 if (!peer || !found_conn
2271 || found_conn->gnc_peer_connstamp != rxmsg->gnm_connstamp) {
2272 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2273 CERROR("Couldnt find matching peer %p or conn %p / %p\n",
2274 peer, conn, found_conn);
2276 CERROR("Unexpected connstamp %#llx(%#llx expected) from %s\n",
2277 rxmsg->gnm_connstamp,
2278 found_conn->gnc_peer_connstamp,
2279 libcfs_nid2str(peer->gnp_nid));
2284 /* add conn ref to ensure it doesn't go away until all eager
2285 * messages processed */
2286 kgnilnd_conn_addref(conn);
2288 /* Now that we have verified the connection is valid and added a
2289 * reference we can remove the read_lock on the peer_conn_lock */
2290 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2292 /* we have no credits or buffers for this message, so copy it
2293 * somewhere for a later kgnilnd_recv */
2294 if (atomic_read(&kgnilnd_data.kgn_neager_allocs) >=
2295 *kgnilnd_tunables.kgn_eager_credits) {
2296 CERROR("Out of eager credits to %s\n",
2297 libcfs_nid2str(conn->gnc_peer->gnp_nid));
2301 atomic_inc(&kgnilnd_data.kgn_neager_allocs);
2303 LIBCFS_ALLOC(eagermsg, sizeof(*eagermsg) + *kgnilnd_tunables.kgn_max_immediate);
2304 if (eagermsg == NULL) {
2305 kgnilnd_conn_decref(conn);
2306 CERROR("couldn't allocate eager rx message for conn %p to %s\n",
2307 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid));
2311 /* copy msg and payload */
2312 memcpy(eagermsg, rxmsg, sizeof(*rxmsg) + rxmsg->gnm_payload_len);
2313 rx->grx_msg = eagermsg;
2316 /* stash this for lnet_finalize on cancel-on-conn-close */
2317 rx->grx_lntmsg = lntmsg;
2319 /* keep the same rx_t, it just has a new grx_msg now */
2320 *new_private = private;
2322 /* release SMSG buffer */
2323 kgnilnd_release_msg(conn);
2329 kgnilnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
2330 int delayed, unsigned int niov,
2331 struct bio_vec *kiov,
2332 unsigned int offset, unsigned int mlen, unsigned int rlen)
2334 kgn_rx_t *rx = private;
2335 kgn_conn_t *conn = rx->grx_conn;
2336 kgn_msg_t *rxmsg = rx->grx_msg;
2342 LASSERT(!in_interrupt());
2343 LASSERTF(mlen <= rlen, "%d <= %d\n", mlen, rlen);
2345 GNIDBG_MSG(D_NET, rxmsg, "conn %p, rxmsg %p, lntmsg %p"
2346 " niov=%d kiov=%p offset=%d mlen=%d rlen=%d",
2347 conn, rxmsg, lntmsg,
2348 niov, kiov, offset, mlen, rlen);
2350 /* we need to lock here as recv can be called from any context */
2351 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
2352 if (rx->grx_eager && conn->gnc_state != GNILND_CONN_ESTABLISHED) {
2353 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2355 /* someone closed the conn after we copied this out, nuke it */
2356 kgnilnd_consume_rx(rx);
2357 lnet_finalize(lntmsg, conn->gnc_error);
2360 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2362 switch (rxmsg->gnm_type) {
2364 GNIDBG_MSG(D_NETERROR, rxmsg, "conn %p, rx %p, rxmsg %p, lntmsg %p"
2365 " niov=%d kiov=%p offset=%d mlen=%d rlen=%d",
2366 conn, rx, rxmsg, lntmsg, niov, kiov, offset, mlen, rlen);
2369 case GNILND_MSG_IMMEDIATE:
2370 if (mlen > rxmsg->gnm_payload_len) {
2371 GNIDBG_MSG(D_ERROR, rxmsg,
2372 "Immediate message from %s too big: %d > %d",
2373 libcfs_nid2str(conn->gnc_peer->gnp_nid), mlen,
2374 rxmsg->gnm_payload_len);
2376 kgnilnd_consume_rx(rx);
2380 /* rxmsg[1] is a pointer to the payload, sitting in the buffer
2381 * right after the kgn_msg_t header - so just 'cute' way of saying
2382 * rxmsg + sizeof(kgn_msg_t) */
2384 /* check payload checksum if sent */
2386 if (*kgnilnd_tunables.kgn_checksum >= 2 &&
2387 !rxmsg->gnm_payload_cksum &&
2388 rxmsg->gnm_payload_len != 0)
2389 GNIDBG_MSG(D_WARNING, rxmsg, "no msg payload checksum when enabled");
2391 if (rxmsg->gnm_payload_cksum != 0) {
2392 /* gnm_payload_len set in kgnilnd_sendmsg from tx->tx_nob,
2393 * which is what is used to calculate the cksum on the TX side */
2394 pload_cksum = kgnilnd_cksum(&rxmsg[1], rxmsg->gnm_payload_len);
2396 if (rxmsg->gnm_payload_cksum != pload_cksum) {
2397 GNIDBG_MSG(D_NETERROR, rxmsg,
2398 "Bad payload checksum (%x expected %x)",
2399 pload_cksum, rxmsg->gnm_payload_cksum);
2400 switch (*kgnilnd_tunables.kgn_checksum_dump) {
2402 kgnilnd_dump_blob(D_BUFFS, "bad payload checksum",
2403 &rxmsg[1], rxmsg->gnm_payload_len);
2406 libcfs_debug_dumplog();
2412 /* checksum problems are fatal, kill the conn */
2413 kgnilnd_consume_rx(rx);
2414 kgnilnd_close_conn(conn, rc);
2419 lnet_copy_flat2kiov(
2421 *kgnilnd_tunables.kgn_max_immediate,
2422 &rxmsg[1], 0, mlen);
2424 kgnilnd_consume_rx(rx);
2425 lnet_finalize(lntmsg, 0);
2428 case GNILND_MSG_PUT_REQ:
2429 /* LNET wants to truncate or drop transaction, sending NAK */
2431 kgnilnd_consume_rx(rx);
2432 lnet_finalize(lntmsg, 0);
2434 /* only error if lntmsg == NULL, otherwise we are just
2435 * short circuiting the rdma process of 0 bytes */
2436 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2437 lntmsg == NULL ? -ENOENT : 0,
2438 rxmsg->gnm_u.get.gngm_cookie,
2442 /* sending ACK with sink buff. info */
2443 tx = kgnilnd_new_tx_msg(GNILND_MSG_PUT_ACK, ni->ni_nid);
2445 kgnilnd_consume_rx(rx);
2449 rc = kgnilnd_set_tx_id(tx, conn);
2451 GOTO(nak_put_req, rc);
2454 rc = kgnilnd_setup_rdma_buffer(tx, niov,
2455 kiov, offset, mlen);
2457 GOTO(nak_put_req, rc);
2460 tx->tx_msg.gnm_u.putack.gnpam_src_cookie =
2461 rxmsg->gnm_u.putreq.gnprm_cookie;
2462 tx->tx_msg.gnm_u.putack.gnpam_dst_cookie = tx->tx_id.txe_cookie;
2463 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_addr =
2464 (__u64)((unsigned long)tx->tx_buffer);
2465 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob = mlen;
2467 tx->tx_lntmsg[0] = lntmsg; /* finalize this on RDMA_DONE */
2468 tx->tx_qtime = jiffies;
2469 /* we only queue from kgnilnd_recv - we might get called from other contexts
2470 * and we don't want to block the mutex in those cases */
2472 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2473 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
2474 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2475 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2477 kgnilnd_consume_rx(rx);
2481 /* make sure we send an error back when the PUT fails */
2482 kgnilnd_nak_rdma(conn, rxmsg->gnm_type, rc, rxmsg->gnm_u.get.gngm_cookie, ni->ni_nid);
2483 kgnilnd_tx_done(tx, rc);
2484 kgnilnd_consume_rx(rx);
2486 /* return magic LNet network error */
2488 case GNILND_MSG_GET_REQ_REV:
2489 /* LNET wants to truncate or drop transaction, sending NAK */
2491 kgnilnd_consume_rx(rx);
2492 lnet_finalize(lntmsg, 0);
2494 /* only error if lntmsg == NULL, otherwise we are just
2495 * short circuiting the rdma process of 0 bytes */
2496 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2497 lntmsg == NULL ? -ENOENT : 0,
2498 rxmsg->gnm_u.get.gngm_cookie,
2502 /* lntmsg can be null when parsing a LNET_GET */
2503 if (lntmsg != NULL) {
2504 /* sending ACK with sink buff. info */
2505 tx = kgnilnd_new_tx_msg(GNILND_MSG_GET_ACK_REV, ni->ni_nid);
2507 kgnilnd_consume_rx(rx);
2511 rc = kgnilnd_set_tx_id(tx, conn);
2513 GOTO(nak_get_req_rev, rc);
2515 rc = kgnilnd_setup_rdma_buffer(tx, niov,
2516 kiov, offset, mlen);
2518 GOTO(nak_get_req_rev, rc);
2520 tx->tx_msg.gnm_u.putack.gnpam_src_cookie =
2521 rxmsg->gnm_u.putreq.gnprm_cookie;
2522 tx->tx_msg.gnm_u.putack.gnpam_dst_cookie = tx->tx_id.txe_cookie;
2523 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_addr =
2524 (__u64)((unsigned long)tx->tx_buffer);
2525 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob = mlen;
2527 tx->tx_lntmsg[0] = lntmsg; /* finalize this on RDMA_DONE */
2529 /* we only queue from kgnilnd_recv - we might get called from other contexts
2530 * and we don't want to block the mutex in those cases */
2532 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
2533 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
2534 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
2535 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
2538 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2540 rxmsg->gnm_u.get.gngm_cookie,
2544 kgnilnd_consume_rx(rx);
2548 /* make sure we send an error back when the GET fails */
2549 kgnilnd_nak_rdma(conn, rxmsg->gnm_type, rc, rxmsg->gnm_u.get.gngm_cookie, ni->ni_nid);
2550 kgnilnd_tx_done(tx, rc);
2551 kgnilnd_consume_rx(rx);
2553 /* return magic LNet network error */
2557 case GNILND_MSG_PUT_REQ_REV:
2558 /* LNET wants to truncate or drop transaction, sending NAK */
2560 kgnilnd_consume_rx(rx);
2561 lnet_finalize(lntmsg, 0);
2563 /* only error if lntmsg == NULL, otherwise we are just
2564 * short circuiting the rdma process of 0 bytes */
2565 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2566 lntmsg == NULL ? -ENOENT : 0,
2567 rxmsg->gnm_u.get.gngm_cookie,
2572 if (lntmsg != NULL) {
2574 kgnilnd_setup_rdma(ni, rx, lntmsg, mlen);
2577 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2579 rxmsg->gnm_u.get.gngm_cookie,
2582 kgnilnd_consume_rx(rx);
2584 case GNILND_MSG_GET_REQ:
2585 if (lntmsg != NULL) {
2587 kgnilnd_setup_rdma(ni, rx, lntmsg, mlen);
2590 kgnilnd_nak_rdma(conn, rxmsg->gnm_type,
2592 rxmsg->gnm_u.get.gngm_cookie,
2595 kgnilnd_consume_rx(rx);
2601 /* needs write_lock on kgn_peer_conn_lock held */
2603 kgnilnd_check_conn_timeouts_locked(kgn_conn_t *conn)
2605 unsigned long timeout, keepalive;
2606 unsigned long now = jiffies;
2607 unsigned long newest_last_rx;
2610 /* given that we found this conn hanging off a peer, it better damned
2611 * well be connected */
2612 LASSERTF(conn->gnc_state == GNILND_CONN_ESTABLISHED,
2613 "conn 0x%p->%s with bad state%s\n", conn,
2614 conn->gnc_peer ? libcfs_nid2str(conn->gnc_peer->gnp_nid)
2616 kgnilnd_conn_state2str(conn));
2618 CDEBUG(D_NET, "checking conn %p->%s timeout %d keepalive %d "
2619 "rx_diff %lu tx_diff %lu\n",
2620 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
2621 conn->gnc_timeout, GNILND_TO2KA(conn->gnc_timeout),
2622 cfs_duration_sec(now - conn->gnc_last_rx_cq),
2623 cfs_duration_sec(now - conn->gnc_last_tx));
2625 timeout = cfs_time_seconds(conn->gnc_timeout);
2626 keepalive = cfs_time_seconds(GNILND_TO2KA(conn->gnc_timeout));
2628 /* just in case our lack of RX msg processing is gumming up the works - give the
2629 * remove an extra chance */
2631 newest_last_rx = GNILND_LASTRX(conn);
2633 if (time_after_eq(now, newest_last_rx + timeout)) {
2634 uint32_t level = D_CONSOLE|D_NETERROR;
2636 if (conn->gnc_peer->gnp_state == GNILND_PEER_DOWN) {
2639 GNIDBG_CONN(level, conn,
2640 "No gnilnd traffic received from %s for %lu "
2641 "seconds, terminating connection. Is node down? ",
2642 libcfs_nid2str(conn->gnc_peer->gnp_nid),
2643 cfs_duration_sec(now - newest_last_rx));
2647 /* we don't timeout on last_tx stalls - we are going to trust the
2648 * underlying network to let us know when sends are failing.
2649 * At worst, the peer will timeout our RX stamp and drop the connection
2650 * at that point. We'll then see his CLOSE or at worst his RX
2651 * stamp stop and drop the connection on our end */
2653 if (time_after_eq(now, conn->gnc_last_tx + keepalive)) {
2654 CDEBUG(D_NET, "sending NOOP -> %s (%p idle %lu(%lu)) "
2655 "last %lu/%lu/%lu %lus/%lus/%lus\n",
2656 libcfs_nid2str(conn->gnc_peer->gnp_nid), conn,
2657 cfs_duration_sec(jiffies - conn->gnc_last_tx),
2659 conn->gnc_last_noop_want, conn->gnc_last_noop_sent,
2660 conn->gnc_last_noop_cq,
2661 cfs_duration_sec(jiffies - conn->gnc_last_noop_want),
2662 cfs_duration_sec(jiffies - conn->gnc_last_noop_sent),
2663 cfs_duration_sec(jiffies - conn->gnc_last_noop_cq));
2664 set_mb(conn->gnc_last_noop_want, jiffies);
2665 atomic_inc(&conn->gnc_reaper_noop);
2666 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
2669 tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, conn->gnc_peer->gnp_net->gnn_ni->ni_nid);
2672 kgnilnd_queue_tx(conn, tx);
2678 /* needs write_lock on kgn_peer_conn_lock held */
2680 kgnilnd_check_peer_timeouts_locked(kgn_peer_t *peer, struct list_head *todie,
2681 struct list_head *souls)
2683 unsigned long timeout;
2684 kgn_conn_t *conn, *connN = NULL;
2690 short releaseconn = 0;
2691 unsigned long first_rx = 0;
2692 int purgatory_conn_cnt = 0;
2694 CDEBUG(D_NET, "checking peer 0x%p->%s for timeouts; interval %lus\n",
2695 peer, libcfs_nid2str(peer->gnp_nid),
2696 peer->gnp_reconnect_interval);
2698 timeout = cfs_time_seconds(max(*kgnilnd_tunables.kgn_timeout,
2699 GNILND_MIN_TIMEOUT));
2701 conn = kgnilnd_find_conn_locked(peer);
2703 /* if there is a valid conn, check the queues for timeouts */
2704 rc = kgnilnd_check_conn_timeouts_locked(conn);
2706 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RX_CLOSE_CLOSING)) {
2707 /* simulate a RX CLOSE after the timeout but before
2708 * the scheduler thread gets it */
2709 conn->gnc_close_recvd = GNILND_CLOSE_INJECT1;
2710 conn->gnc_peer_error = -ETIMEDOUT;
2713 if (*kgnilnd_tunables.kgn_to_reconn_disable &&
2715 peer->gnp_state = GNILND_PEER_TIMED_OUT;
2716 CDEBUG(D_WARNING, "%s conn timed out, will "
2717 "reconnect upon request from peer\n",
2718 libcfs_nid2str(conn->gnc_peer->gnp_nid));
2720 /* Once we mark closed, any of the scheduler threads could
2721 * get it and move through before we hit the fail loc code */
2722 kgnilnd_close_conn_locked(conn, rc);
2724 /* first_rx is used to decide when to release a conn from purgatory.
2726 first_rx = conn->gnc_first_rx;
2730 /* now regardless of starting new conn, find tx on peer queue that
2731 * are old and smell bad - do this first so we don't trigger
2732 * reconnect on empty queue if we timeout all */
2733 list_for_each_entry_safe(tx, txN, &peer->gnp_tx_queue, tx_list) {
2734 if (time_after_eq(jiffies, tx->tx_qtime + timeout)) {
2736 LCONSOLE_INFO("could not send to %s due to connection"
2737 " setup failure after %lu seconds\n",
2738 libcfs_nid2str(peer->gnp_nid),
2739 cfs_duration_sec(jiffies - tx->tx_qtime));
2741 kgnilnd_tx_del_state_locked(tx, peer, NULL,
2743 list_add_tail(&tx->tx_list, todie);
2748 if (count || peer->gnp_connecting == GNILND_PEER_KILL) {
2749 CDEBUG(D_NET, "canceling %d tx for peer 0x%p->%s\n",
2750 count, peer, libcfs_nid2str(peer->gnp_nid));
2751 /* if we nuked all the TX, stop peer connection attempt (if there is one..) */
2752 if (list_empty(&peer->gnp_tx_queue) ||
2753 peer->gnp_connecting == GNILND_PEER_KILL) {
2754 /* we pass down todie to use a common function - but we know there are
2756 kgnilnd_cancel_peer_connect_locked(peer, todie);
2760 /* Don't reconnect if we are still trying to clear out old conns.
2761 * This prevents us sending traffic on the new mbox before ensuring we are done
2762 * with the old one */
2763 reconnect = (peer->gnp_state == GNILND_PEER_UP) &&
2764 (atomic_read(&peer->gnp_dirty_eps) == 0);
2766 /* fast reconnect after a timeout */
2767 to_reconn = !conn &&
2768 (peer->gnp_last_errno == -ETIMEDOUT) &&
2769 *kgnilnd_tunables.kgn_fast_reconn;
2771 /* if we are not connected and there are tx on the gnp_tx_queue waiting
2772 * to be sent, we'll check the reconnect interval and fire up a new
2773 * connection request */
2776 (peer->gnp_connecting == GNILND_PEER_IDLE) &&
2777 (time_after_eq(jiffies, peer->gnp_reconnect_time)) &&
2778 (!list_empty(&peer->gnp_tx_queue) || to_reconn)) {
2780 CDEBUG(D_NET, "starting connect to %s\n",
2781 libcfs_nid2str(peer->gnp_nid));
2782 LASSERTF(peer->gnp_connecting == GNILND_PEER_IDLE,
2783 "Peer was idle and we have a write_lock, state issue %d\n",
2784 peer->gnp_connecting);
2786 peer->gnp_connecting = GNILND_PEER_CONNECT;
2787 kgnilnd_peer_addref(peer); /* extra ref for connd */
2789 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2790 list_add_tail(&peer->gnp_connd_list,
2791 &peer->gnp_net->gnn_dev->gnd_connd_peers);
2792 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2794 kgnilnd_schedule_dgram(peer->gnp_net->gnn_dev);
2797 /* fail_loc to allow us to delay release of purgatory */
2798 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PURG_REL_DELAY))
2801 /* This check allows us to verify that the new conn is actually being used. This allows us to
2802 * pull the old conns out of purgatory if they have actually seen traffic.
2803 * We only release a conn from purgatory during stack reset, admin command, or when a peer reconnects
2806 time_after(jiffies, first_rx + cfs_time_seconds(*kgnilnd_tunables.kgn_hardware_timeout))) {
2807 CDEBUG(D_INFO, "We can release peer %s conn's from purgatory %lu\n",
2808 libcfs_nid2str(peer->gnp_nid), first_rx + cfs_time_seconds(*kgnilnd_tunables.kgn_hardware_timeout));
2812 list_for_each_entry_safe (conn, connN, &peer->gnp_conns, gnc_list) {
2813 /* check for purgatory timeouts */
2814 if (conn->gnc_in_purgatory) {
2815 /* We cannot detach this conn from purgatory if it has not been closed so we reschedule it
2816 * that way the next time we check it we can detach it from purgatory
2819 if (conn->gnc_state != GNILND_CONN_DONE) {
2820 /* Skip over conns that are currently not DONE. If they arent already scheduled
2821 * for completion something in the state machine is broken.
2826 /* We only detach a conn that is in purgatory if we have received a close message,
2827 * we have a new valid connection that has successfully received data, or an admin
2828 * command tells us we need to detach.
2831 if (conn->gnc_close_recvd || releaseconn || conn->gnc_needs_detach) {
2832 unsigned long waiting;
2834 waiting = (long) jiffies - conn->gnc_last_rx_cq;
2836 /* C.E: The remote peer is expected to close the
2837 * connection (see kgnilnd_check_conn_timeouts)
2838 * via the reaper thread and nuke out the MDD and
2839 * FMA resources after conn->gnc_timeout has expired
2840 * without an FMA RX */
2841 CDEBUG(D_NET, "Reconnected to %s in %lds or admin forced detach, dropping "
2842 " held resources\n",
2843 libcfs_nid2str(conn->gnc_peer->gnp_nid),
2844 cfs_duration_sec(waiting));
2846 kgnilnd_detach_purgatory_locked(conn, souls);
2848 purgatory_conn_cnt++;
2853 /* If we have too many connections in purgatory we could run out of
2854 * resources. Limit the number of connections to a tunable number,
2855 * clean up to the minimum all in one fell swoop... there are
2856 * situations where dvs will retry tx's and we can eat up several
2857 * hundread connection requests at once.
2859 if (purgatory_conn_cnt > *kgnilnd_tunables.kgn_max_purgatory) {
2860 list_for_each_entry_safe(conn, connN, &peer->gnp_conns,
2862 if (conn->gnc_in_purgatory &&
2863 conn->gnc_state == GNILND_CONN_DONE) {
2864 CDEBUG(D_NET, "Dropping Held resource due to"
2865 " resource limits being hit\n");
2866 kgnilnd_detach_purgatory_locked(conn, souls);
2868 if (purgatory_conn_cnt-- <
2869 *kgnilnd_tunables.kgn_max_purgatory)
2877 kgnilnd_reaper_check(int idx)
2879 struct list_head *peers = &kgnilnd_data.kgn_peers[idx];
2880 struct list_head *ctmp, *ctmpN;
2881 LIST_HEAD(geriatrics);
2884 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2886 list_for_each_safe(ctmp, ctmpN, peers) {
2887 kgn_peer_t *peer = NULL;
2889 /* don't timeout stuff if the network is mucked or shutting down */
2890 if (kgnilnd_check_hw_quiesce()) {
2893 peer = list_entry(ctmp, kgn_peer_t, gnp_list);
2895 kgnilnd_check_peer_timeouts_locked(peer, &geriatrics, &souls);
2898 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2900 kgnilnd_txlist_done(&geriatrics, -EHOSTUNREACH);
2901 kgnilnd_release_purgatory_list(&souls);
2905 kgnilnd_update_reaper_timeout(long timeout)
2907 LASSERT(timeout > 0);
2909 spin_lock(&kgnilnd_data.kgn_reaper_lock);
2911 if (timeout < kgnilnd_data.kgn_new_min_timeout)
2912 kgnilnd_data.kgn_new_min_timeout = timeout;
2914 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2918 kgnilnd_reaper_poke_with_stick(cfs_timer_cb_arg_t arg)
2920 wake_up(&kgnilnd_data.kgn_reaper_waitq);
2924 kgnilnd_reaper(void *arg)
2929 unsigned long next_check_time = jiffies;
2930 long current_min_timeout = MAX_SCHEDULE_TIMEOUT;
2931 struct timer_list timer;
2934 /* all gnilnd threads need to run fairly urgently */
2935 set_user_nice(current, *kgnilnd_tunables.kgn_nice);
2936 spin_lock(&kgnilnd_data.kgn_reaper_lock);
2938 while (!kgnilnd_data.kgn_shutdown) {
2939 /* I wake up every 'p' seconds to check for timeouts on some
2940 * more peers. I try to check every connection 'n' times
2941 * within the global minimum of all keepalive and timeout
2942 * intervals, to ensure I attend to every connection within
2943 * (n+1)/n times its timeout intervals. */
2944 const int p = GNILND_REAPER_THREAD_WAKE;
2945 const int n = GNILND_REAPER_NCHECKS;
2947 /* to quiesce or to not quiesce, that is the question */
2948 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
2949 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2950 KGNILND_SPIN_QUIESCE;
2951 spin_lock(&kgnilnd_data.kgn_reaper_lock);
2954 /* careful with the jiffy wrap... */
2955 timeout = (long)(next_check_time - jiffies);
2958 prepare_to_wait(&kgnilnd_data.kgn_reaper_waitq, &wait,
2959 TASK_INTERRUPTIBLE);
2960 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2961 cfs_timer_setup(&timer, kgnilnd_reaper_poke_with_stick,
2962 next_check_time, 0);
2963 mod_timer(&timer, (long) jiffies + timeout);
2965 /* check flag variables before committing */
2966 if (!kgnilnd_data.kgn_shutdown &&
2967 !kgnilnd_data.kgn_quiesce_trigger) {
2968 CDEBUG(D_INFO, "schedule timeout %ld (%lu sec)\n",
2969 timeout, cfs_duration_sec(timeout));
2971 CDEBUG(D_INFO, "awake after schedule\n");
2974 del_singleshot_timer_sync(&timer);
2975 spin_lock(&kgnilnd_data.kgn_reaper_lock);
2976 finish_wait(&kgnilnd_data.kgn_reaper_waitq, &wait);
2980 /* new_min_timeout is set from the conn timeouts and keepalive
2981 * this should end up with a min timeout of
2982 * GNILND_TIMEOUT2KEEPALIVE(t) or roughly LND_TIMEOUT/2 */
2983 if (kgnilnd_data.kgn_new_min_timeout < current_min_timeout) {
2984 current_min_timeout = kgnilnd_data.kgn_new_min_timeout;
2985 CDEBUG(D_NET, "Set new min timeout %ld\n",
2986 current_min_timeout);
2989 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
2991 /* Compute how many table entries to check now so I get round
2992 * the whole table fast enough given that I do this at fixed
2993 * intervals of 'p' seconds) */
2994 chunk = *kgnilnd_tunables.kgn_peer_hash_size;
2995 if (kgnilnd_data.kgn_new_min_timeout > n * p)
2996 chunk = (chunk * n * p) /
2997 kgnilnd_data.kgn_new_min_timeout;
3000 for (i = 0; i < chunk; i++) {
3001 kgnilnd_reaper_check(hash_index);
3002 hash_index = (hash_index + 1) %
3003 *kgnilnd_tunables.kgn_peer_hash_size;
3005 next_check_time = (long) jiffies + cfs_time_seconds(p);
3006 CDEBUG(D_INFO, "next check at %lu or in %d sec\n", next_check_time, p);
3008 spin_lock(&kgnilnd_data.kgn_reaper_lock);
3011 spin_unlock(&kgnilnd_data.kgn_reaper_lock);
3013 kgnilnd_thread_fini();
3018 kgnilnd_recv_bte_get(kgn_tx_t *tx) {
3019 unsigned niov, offset, nob;
3020 struct bio_vec *kiov;
3021 struct lnet_msg *lntmsg = tx->tx_lntmsg[0];
3022 kgnilnd_parse_lnet_rdma(lntmsg, &niov, &offset, &nob, &kiov, tx->tx_nob_rdma);
3025 lnet_copy_flat2kiov(
3028 tx->tx_buffer_copy + tx->tx_offset, 0, nob);
3030 memcpy(tx->tx_buffer, tx->tx_buffer_copy + tx->tx_offset, nob);
3037 kgnilnd_check_rdma_cq(kgn_device_t *dev)
3040 gni_post_descriptor_t *desc;
3042 kgn_tx_ev_id_t ev_id;
3044 int should_retry, rc;
3045 long num_processed = 0;
3046 kgn_conn_t *conn = NULL;
3047 kgn_tx_t *tx = NULL;
3048 kgn_rdma_desc_t *rdesc;
3053 /* make sure we don't keep looping if we need to reset */
3054 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3055 return num_processed;
3057 rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
3059 /* we didn't get the mutex, so return that there is still work
3063 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DELAY_RDMA)) {
3064 /* a bit gross - but we need a good way to test for
3065 * delayed RDMA completions and the easiest way to do
3066 * that is to delay the RDMA CQ events */
3067 rrc = GNI_RC_NOT_DONE;
3069 rrc = kgnilnd_cq_get_event(dev->gnd_snd_rdma_cqh, &event_data);
3072 if (rrc == GNI_RC_NOT_DONE) {
3073 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3074 CDEBUG(D_INFO, "SEND RDMA CQ %d empty processed %ld\n",
3075 dev->gnd_id, num_processed);
3076 return num_processed;
3078 dev->gnd_sched_alive = jiffies;
3081 LASSERTF(!GNI_CQ_OVERRUN(event_data),
3082 "this is bad, somehow our credits didn't protect us"
3083 " from CQ overrun\n");
3084 LASSERTF(GNI_CQ_GET_TYPE(event_data) == GNI_CQ_EVENT_TYPE_POST,
3085 "rrc %d, GNI_CQ_GET_TYPE(%#llx) = %#llx\n", rrc,
3086 event_data, GNI_CQ_GET_TYPE(event_data));
3088 rrc = kgnilnd_get_completed(dev->gnd_snd_rdma_cqh, event_data,
3090 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3092 /* XXX Nic: Need better error handling here... */
3093 LASSERTF((rrc == GNI_RC_SUCCESS) ||
3094 (rrc == GNI_RC_TRANSACTION_ERROR),
3097 ev_id.txe_cookie = desc->post_id;
3099 kgnilnd_validate_tx_ev_id(&ev_id, &tx, &conn);
3101 if (conn == NULL || tx == NULL) {
3102 /* either conn or tx was already nuked and this is a "late"
3103 * completion, so drop it */
3107 GNITX_ASSERTF(tx, tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE ||
3108 tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE ||
3109 tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV ||
3110 tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV,
3111 "tx %p with type %d\n", tx, tx->tx_msg.gnm_type);
3113 GNIDBG_TX(D_NET, tx, "RDMA completion for %d bytes", tx->tx_nob);
3115 if (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) {
3116 lnet_set_reply_msg_len(NULL, tx->tx_lntmsg[1],
3117 tx->tx_msg.gnm_u.completion.gncm_retval);
3121 if (tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV && desc->status == GNI_RC_SUCCESS) {
3122 if (tx->tx_buffer_copy != NULL)
3123 kgnilnd_recv_bte_get(tx);
3124 rc = kgnilnd_verify_rdma_cksum(tx, tx->tx_putinfo.gnpam_payload_cksum, tx->tx_nob_rdma);
3127 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE_REV && desc->status == GNI_RC_SUCCESS) {
3128 if (tx->tx_buffer_copy != NULL)
3129 kgnilnd_recv_bte_get(tx);
3130 rc = kgnilnd_verify_rdma_cksum(tx, tx->tx_getinfo.gngm_payload_cksum, tx->tx_nob_rdma);
3133 /* remove from rdmaq */
3134 kgnilnd_conn_mutex_lock(&conn->gnc_rdma_mutex);
3135 spin_lock(&conn->gnc_list_lock);
3136 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
3137 spin_unlock(&conn->gnc_list_lock);
3138 kgnilnd_conn_mutex_unlock(&conn->gnc_rdma_mutex);
3140 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RDMA_CQ_ERROR)) {
3141 event_data = 1LL << 48;
3145 if (likely(desc->status == GNI_RC_SUCCESS) && rc == 0) {
3146 atomic_inc(&dev->gnd_rdma_ntx);
3147 atomic64_add(tx->tx_nob, &dev->gnd_rdma_txbytes);
3148 /* transaction succeeded, add into fmaq */
3149 kgnilnd_queue_tx(conn, tx);
3150 kgnilnd_peer_alive(conn->gnc_peer);
3152 /* drop ref from kgnilnd_validate_tx_ev_id */
3153 kgnilnd_admin_decref(conn->gnc_tx_in_use);
3154 kgnilnd_conn_decref(conn);
3159 /* fall through to the TRANSACTION_ERROR case */
3162 /* get stringified version for log messages */
3163 kgnilnd_cq_error_str(event_data, &err_str, 256);
3164 kgnilnd_cq_error_recoverable(event_data, &should_retry);
3166 /* make sure we are not off in the weeds with this tx */
3167 if (tx->tx_retrans >
3168 *kgnilnd_tunables.kgn_max_retransmits) {
3169 GNIDBG_TX(D_NETERROR, tx,
3170 "giving up on TX, too many retries", NULL);
3174 GNIDBG_TX(D_NETERROR, tx, "RDMA %s error (%s)",
3175 should_retry ? "transient" : "unrecoverable", err_str);
3177 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_DONE ||
3178 tx->tx_msg.gnm_type == GNILND_MSG_GET_DONE_REV) {
3179 rdesc = &tx->tx_putinfo.gnpam_desc;
3180 rnob = tx->tx_putinfo.gnpam_desc.gnrd_nob;
3181 rcookie = tx->tx_putinfo.gnpam_dst_cookie;
3183 rdesc = &tx->tx_getinfo.gngm_desc;
3184 rnob = tx->tx_lntmsg[0]->msg_len;
3185 rcookie = tx->tx_getinfo.gngm_cookie;
3190 tx->tx_msg.gnm_type,
3194 kgnilnd_nak_rdma(conn,
3195 tx->tx_msg.gnm_type,
3198 tx->tx_msg.gnm_srcnid);
3199 kgnilnd_tx_done(tx, -GNILND_NOPURG);
3200 kgnilnd_close_conn(conn, -ECOMM);
3203 /* drop ref from kgnilnd_validate_tx_ev_id */
3204 kgnilnd_admin_decref(conn->gnc_tx_in_use);
3205 kgnilnd_conn_decref(conn);
3210 kgnilnd_check_fma_send_cq(kgn_device_t *dev)
3214 kgn_tx_ev_id_t ev_id;
3215 kgn_tx_t *tx = NULL;
3216 kgn_conn_t *conn = NULL;
3217 int queued_fma, saw_reply, rc;
3218 long num_processed = 0;
3219 struct list_head *ctmp, *ctmpN;
3222 /* make sure we don't keep looping if we need to reset */
3223 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3224 return num_processed;
3227 rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
3229 /* we didn't get the mutex, so return that there is still work
3234 rrc = kgnilnd_cq_get_event(dev->gnd_snd_fma_cqh, &event_data);
3235 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3237 if (rrc == GNI_RC_NOT_DONE) {
3239 "SMSG send CQ %d not ready (data %#llx) "
3240 "processed %ld\n", dev->gnd_id, event_data,
3243 if (num_processed > 0) {
3244 spin_lock(&dev->gnd_lock);
3245 if (!list_empty(&dev->gnd_delay_conns)) {
3246 list_for_each_safe(ctmp, ctmpN, &dev->gnd_delay_conns) {
3247 conn = list_entry(ctmp, kgn_conn_t, gnc_delaylist);
3248 list_del_init(&conn->gnc_delaylist);
3249 CDEBUG(D_NET, "Moving Conn %p from delay queue to ready_queue\n", conn);
3250 kgnilnd_schedule_conn_nolock(conn);
3252 spin_unlock(&dev->gnd_lock);
3253 kgnilnd_schedule_device(dev);
3255 spin_unlock(&dev->gnd_lock);
3258 return num_processed;
3261 dev->gnd_sched_alive = jiffies;
3264 LASSERTF(!GNI_CQ_OVERRUN(event_data),
3265 "this is bad, somehow our credits didn't "
3266 "protect us from CQ overrun\n");
3267 LASSERTF(GNI_CQ_GET_TYPE(event_data) == GNI_CQ_EVENT_TYPE_SMSG,
3268 "rrc %d, GNI_CQ_GET_TYPE(%#llx) = %#llx\n", rrc,
3269 event_data, GNI_CQ_GET_TYPE(event_data));
3271 /* if SMSG couldn't handle an error, time for conn to die */
3272 if (unlikely(rrc == GNI_RC_TRANSACTION_ERROR)) {
3275 /* need to take the write_lock to ensure atomicity
3276 * on the conn state if we need to close it */
3277 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
3278 conn = kgnilnd_cqid2conn_locked(GNI_CQ_GET_INST_ID(event_data));
3280 /* Conn was destroyed? */
3282 "SMSG CQID lookup %#llx failed\n",
3283 GNI_CQ_GET_INST_ID(event_data));
3284 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3288 kgnilnd_cq_error_str(event_data, &err_str, 256);
3289 CNETERR("SMSG send error to %s: rc %d (%s)\n",
3290 libcfs_nid2str(conn->gnc_peer->gnp_nid),
3292 kgnilnd_close_conn_locked(conn, -ECOMM);
3294 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3296 /* no need to process rest of this tx -
3297 * it is getting canceled */
3301 /* fall through to GNI_RC_SUCCESS case */
3302 ev_id.txe_smsg_id = GNI_CQ_GET_MSG_ID(event_data);
3304 kgnilnd_validate_tx_ev_id(&ev_id, &tx, &conn);
3305 if (conn == NULL || tx == NULL) {
3306 /* either conn or tx was already nuked and this is a "late"
3307 * completion, so drop it */
3311 tx->tx_conn->gnc_last_tx_cq = jiffies;
3312 if (tx->tx_msg.gnm_type == GNILND_MSG_NOOP) {
3313 set_mb(conn->gnc_last_noop_cq, jiffies);
3316 /* lock tx_list_state and tx_state */
3317 kgnilnd_conn_mutex_lock(&conn->gnc_smsg_mutex);
3318 spin_lock(&tx->tx_conn->gnc_list_lock);
3320 GNITX_ASSERTF(tx, tx->tx_list_state == GNILND_TX_LIVE_FMAQ,
3321 "state not GNILND_TX_LIVE_FMAQ", NULL);
3322 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_COMPLETION,
3323 "not waiting for completion", NULL);
3325 GNIDBG_TX(D_NET, tx, "SMSG complete tx_state %x rc %d",
3328 tx->tx_state &= ~GNILND_TX_WAITING_COMPLETION;
3330 /* This will trigger other FMA sends that were
3331 * pending this completion */
3332 queued_fma = !list_empty(&tx->tx_conn->gnc_fmaq);
3334 /* we either did not expect reply or we already got it */
3335 saw_reply = !(tx->tx_state & GNILND_TX_WAITING_REPLY);
3337 spin_unlock(&tx->tx_conn->gnc_list_lock);
3338 kgnilnd_conn_mutex_unlock(&conn->gnc_smsg_mutex);
3341 CDEBUG(D_NET, "scheduling conn 0x%p->%s for fmaq\n",
3343 libcfs_nid2str(conn->gnc_peer->gnp_nid));
3344 kgnilnd_schedule_conn(conn);
3347 /* If saw_reply is false as soon as gnc_list_lock is dropped the tx could be nuked
3348 * If saw_reply is true we know that the tx is safe to use as the other thread
3349 * is already finished with it.
3353 /* no longer need to track on the live_fmaq */
3354 kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
3356 if (tx->tx_state & GNILND_TX_PENDING_RDMA) {
3357 /* we already got reply & were waiting for
3358 * completion of initial send */
3359 /* to initiate RDMA transaction */
3360 GNIDBG_TX(D_NET, tx,
3361 "Pending RDMA 0x%p type 0x%02x",
3362 tx->tx_msg.gnm_type);
3363 tx->tx_state &= ~GNILND_TX_PENDING_RDMA;
3364 rc = kgnilnd_send_mapped_tx(tx, 0);
3365 GNITX_ASSERTF(tx, rc == 0, "RDMA send failed: %d\n", rc);
3367 /* we are done with this tx */
3368 GNIDBG_TX(D_NET, tx,
3369 "Done with tx type 0x%02x",
3370 tx->tx_msg.gnm_type);
3371 kgnilnd_tx_done(tx, tx->tx_rc);
3375 /* drop ref from kgnilnd_validate_tx_ev_id */
3376 kgnilnd_admin_decref(conn->gnc_tx_in_use);
3377 kgnilnd_conn_decref(conn);
3379 /* if we are waiting for a REPLY, we'll handle the tx then */
3380 } /* end for loop */
3384 kgnilnd_check_fma_rcv_cq(kgn_device_t *dev)
3389 long num_processed = 0;
3390 struct list_head *conns;
3391 struct list_head *tmp;
3395 /* make sure we don't keep looping if we need to reset */
3396 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3397 return num_processed;
3400 rc = kgnilnd_mutex_trylock(&dev->gnd_cq_mutex);
3402 /* we didn't get the mutex, so return that there is still work
3406 rrc = kgnilnd_cq_get_event(dev->gnd_rcv_fma_cqh, &event_data);
3407 kgnilnd_gl_mutex_unlock(&dev->gnd_cq_mutex);
3409 if (rrc == GNI_RC_NOT_DONE) {
3410 CDEBUG(D_INFO, "SMSG RX CQ %d empty data %#llx "
3412 dev->gnd_id, event_data, num_processed);
3413 return num_processed;
3415 dev->gnd_sched_alive = jiffies;
3418 /* this is the only CQ that can really handle transient
3420 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CQ_GET_EVENT)) {
3421 rrc = cfs_fail_val ? cfs_fail_val
3422 : GNI_RC_ERROR_RESOURCE;
3423 if (rrc == GNI_RC_ERROR_RESOURCE) {
3424 /* set overrun too */
3425 event_data |= (1UL << 63);
3426 LASSERTF(GNI_CQ_OVERRUN(event_data),
3427 "(1UL << 63) is no longer the bit to set to indicate CQ_OVERRUN\n");
3430 /* sender should get error event too and take care
3431 of failed transaction by re-transmitting */
3432 if (rrc == GNI_RC_TRANSACTION_ERROR) {
3433 CDEBUG(D_NET, "SMSG RX CQ error %#llx\n", event_data);
3437 if (likely(!GNI_CQ_OVERRUN(event_data))) {
3438 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
3439 conn = kgnilnd_cqid2conn_locked(
3440 GNI_CQ_GET_INST_ID(event_data));
3442 CDEBUG(D_NET, "SMSG RX CQID lookup %llu "
3443 "failed, dropping event %#llx\n",
3444 GNI_CQ_GET_INST_ID(event_data),
3447 CDEBUG(D_NET, "SMSG RX: CQID %llu "
3449 GNI_CQ_GET_INST_ID(event_data),
3450 conn, conn->gnc_peer ?
3451 libcfs_nid2str(conn->gnc_peer->gnp_nid) :
3454 conn->gnc_last_rx_cq = jiffies;
3456 /* stash first rx so we can clear out purgatory.
3458 if (conn->gnc_first_rx == 0) {
3459 conn->gnc_first_rx = jiffies;
3461 kgnilnd_peer_alive(conn->gnc_peer);
3462 kgnilnd_schedule_conn(conn);
3464 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3468 /* FMA CQ has overflowed: check ALL conns */
3469 CNETERR("SMSG RX CQ overflow: scheduling ALL "
3470 "conns on device %d\n", dev->gnd_id);
3472 for (rc = 0; rc < *kgnilnd_tunables.kgn_peer_hash_size; rc++) {
3474 read_lock(&kgnilnd_data.kgn_peer_conn_lock);
3475 conns = &kgnilnd_data.kgn_conns[rc];
3477 list_for_each(tmp, conns) {
3478 conn = list_entry(tmp, kgn_conn_t,
3481 if (conn->gnc_device == dev) {
3482 kgnilnd_schedule_conn(conn);
3483 conn->gnc_last_rx_cq = jiffies;
3487 /* don't block write lockers for too long... */
3488 read_unlock(&kgnilnd_data.kgn_peer_conn_lock);
3493 /* try_map_if_full should only be used when processing TX from list of
3494 * backlog TX waiting on mappings to free up
3497 * try_map_if_full = 0: 0 (sent or queued), (-|+)errno failure of kgnilnd_sendmsg
3498 * try_map_if_full = 1: 0 (sent), -ENOMEM for caller to requeue, (-|+)errno failure of kgnilnd_sendmsg */
3501 kgnilnd_send_mapped_tx(kgn_tx_t *tx, int try_map_if_full)
3503 /* slight bit of race if multiple people calling, but at worst we'll have
3504 * order altered just a bit... which would not be determenistic anyways */
3505 int rc = atomic_read(&tx->tx_conn->gnc_device->gnd_nq_map);
3507 GNIDBG_TX(D_NET, tx, "try %d nq_map %d", try_map_if_full, rc);
3509 /* We know that we have a GART reservation that should guarantee forward progress.
3510 * This means we don't need to take any extraordinary efforts if we are failing
3511 * mappings here - even if we are holding a very small number of these. */
3513 if (try_map_if_full || (rc == 0)) {
3514 rc = kgnilnd_map_buffer(tx);
3517 /* rc should be 0 if we mapped successfully here, if non-zero
3518 * we are queueing */
3520 /* if try_map_if_full set, they handle requeuing */
3521 if (unlikely(try_map_if_full)) {
3524 spin_lock(&tx->tx_conn->gnc_device->gnd_lock);
3525 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 1);
3526 spin_unlock(&tx->tx_conn->gnc_device->gnd_lock);
3527 /* make sure we wake up sched to run this */
3528 kgnilnd_schedule_device(tx->tx_conn->gnc_device);
3529 /* return 0 as this is now queued for later sending */
3534 switch (tx->tx_msg.gnm_type) {
3538 /* GET_REQ and PUT_ACK are outbound messages sending our mapping key to
3539 * remote node where the RDMA will be started
3540 * Special case -EAGAIN logic - this should just queued as if the mapping couldn't
3541 * be satisified. The rest of the errors are "hard" errors that require
3542 * upper layers to handle themselves.
3543 * If kgnilnd_post_rdma returns a resource error, kgnilnd_rdma will put
3544 * the tx back on the TX_MAPQ. When this tx is pulled back off the MAPQ,
3545 * it's gnm_type will now be GNILND_MSG_PUT_DONE or
3546 * GNILND_MSG_GET_DONE_REV.
3548 case GNILND_MSG_GET_REQ:
3549 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_key = tx->tx_map_key;
3550 tx->tx_msg.gnm_u.get.gngm_cookie = tx->tx_id.txe_cookie;
3551 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_addr = (__u64)((unsigned long)tx->tx_buffer);
3552 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_nob = tx->tx_nob;
3553 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3554 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GET_REQ_AGAIN)) {
3555 tx->tx_state |= GNILND_TX_FAIL_SMSG;
3557 /* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
3558 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3560 case GNILND_MSG_PUT_ACK:
3561 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_key = tx->tx_map_key;
3562 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3563 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PUT_ACK_AGAIN)) {
3564 tx->tx_state |= GNILND_TX_FAIL_SMSG;
3566 /* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
3567 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3570 /* PUT_REQ and GET_DONE are where we do the actual RDMA */
3571 case GNILND_MSG_PUT_DONE:
3572 case GNILND_MSG_PUT_REQ:
3573 rc = kgnilnd_rdma(tx, GNILND_MSG_PUT_DONE,
3574 &tx->tx_putinfo.gnpam_desc,
3575 tx->tx_putinfo.gnpam_desc.gnrd_nob,
3576 tx->tx_putinfo.gnpam_dst_cookie);
3577 RETURN(try_map_if_full ? rc : 0);
3579 case GNILND_MSG_GET_DONE:
3580 rc = kgnilnd_rdma(tx, GNILND_MSG_GET_DONE,
3581 &tx->tx_getinfo.gngm_desc,
3582 tx->tx_lntmsg[0]->msg_len,
3583 tx->tx_getinfo.gngm_cookie);
3584 RETURN(try_map_if_full ? rc : 0);
3586 case GNILND_MSG_PUT_REQ_REV:
3587 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_key = tx->tx_map_key;
3588 tx->tx_msg.gnm_u.get.gngm_cookie = tx->tx_id.txe_cookie;
3589 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_addr = (__u64)((unsigned long)tx->tx_buffer);
3590 tx->tx_msg.gnm_u.get.gngm_desc.gnrd_nob = tx->tx_nob;
3591 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3592 kgnilnd_compute_rdma_cksum(tx, tx->tx_nob);
3593 tx->tx_msg.gnm_u.get.gngm_payload_cksum = tx->tx_msg.gnm_payload_cksum;
3595 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3597 case GNILND_MSG_PUT_DONE_REV:
3598 rc = kgnilnd_rdma(tx, GNILND_MSG_PUT_DONE_REV,
3599 &tx->tx_getinfo.gngm_desc,
3601 tx->tx_getinfo.gngm_cookie);
3602 RETURN(try_map_if_full ? rc : 0);
3604 case GNILND_MSG_GET_ACK_REV:
3605 tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_key = tx->tx_map_key;
3606 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3607 /* LNET_GETS are a special case for parse */
3608 kgnilnd_compute_rdma_cksum(tx, tx->tx_msg.gnm_u.putack.gnpam_desc.gnrd_nob);
3609 tx->tx_msg.gnm_u.putack.gnpam_payload_cksum = tx->tx_msg.gnm_payload_cksum;
3611 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PUT_ACK_AGAIN))
3612 tx->tx_state |= GNILND_TX_FAIL_SMSG;
3614 /* redirect to FMAQ on failure, no need to infinite loop here in MAPQ */
3615 rc = kgnilnd_sendmsg(tx, NULL, 0, &tx->tx_conn->gnc_list_lock, GNILND_TX_FMAQ);
3617 case GNILND_MSG_GET_DONE_REV:
3618 case GNILND_MSG_GET_REQ_REV:
3619 rc = kgnilnd_rdma(tx, GNILND_MSG_GET_DONE_REV,
3620 &tx->tx_putinfo.gnpam_desc,
3621 tx->tx_putinfo.gnpam_desc.gnrd_nob,
3622 tx->tx_putinfo.gnpam_dst_cookie);
3623 RETURN(try_map_if_full ? rc : 0);
3631 kgnilnd_process_fmaq(kgn_conn_t *conn)
3634 kgn_tx_t *tx = NULL;
3635 void *buffer = NULL;
3636 unsigned int nob = 0;
3639 /* NB 1. kgnilnd_sendmsg() may fail if I'm out of credits right now.
3640 * However I will be rescheduled by an FMA completion event
3641 * when I eventually get some.
3642 * NB 2. Sampling gnc_state here races with setting it elsewhere.
3643 * But it doesn't matter if I try to send a "real" message just
3644 * as I start closing because I'll get scheduled to send the
3647 /* Short circuit if the ep_handle is null we cant send anyway. */
3648 if (conn->gnc_ephandle == NULL)
3651 LASSERTF(!conn->gnc_close_sent, "Conn %p close was sent\n", conn);
3653 spin_lock(&conn->gnc_list_lock);
3655 if (list_empty(&conn->gnc_fmaq)) {
3656 int keepalive = GNILND_TO2KA(conn->gnc_timeout);
3658 spin_unlock(&conn->gnc_list_lock);
3660 if (time_after_eq(jiffies, conn->gnc_last_tx + cfs_time_seconds(keepalive))) {
3661 CDEBUG(D_NET, "sending NOOP -> %s (%p idle %lu(%d)) "
3662 "last %lu/%lu/%lu %lus/%lus/%lus\n",
3663 libcfs_nid2str(conn->gnc_peer->gnp_nid), conn,
3664 cfs_duration_sec(jiffies - conn->gnc_last_tx),
3666 conn->gnc_last_noop_want, conn->gnc_last_noop_sent,
3667 conn->gnc_last_noop_cq,
3668 cfs_duration_sec(jiffies - conn->gnc_last_noop_want),
3669 cfs_duration_sec(jiffies - conn->gnc_last_noop_sent),
3670 cfs_duration_sec(jiffies - conn->gnc_last_noop_cq));
3671 atomic_inc(&conn->gnc_sched_noop);
3672 set_mb(conn->gnc_last_noop_want, jiffies);
3674 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NOOP_SEND))
3677 tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, conn->gnc_peer->gnp_net->gnn_ni->ni_nid);
3681 rc = kgnilnd_set_tx_id(tx, conn);
3683 kgnilnd_tx_done(tx, rc);
3689 tx = list_first_entry(&conn->gnc_fmaq, kgn_tx_t, tx_list);
3690 /* move from fmaq to allocd, kgnilnd_sendmsg will move to live_fmaq */
3691 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
3692 more_to_do = !list_empty(&conn->gnc_fmaq);
3693 spin_unlock(&conn->gnc_list_lock);
3696 /* if there is no real TX or no NOOP to send, bail */
3701 if (!tx->tx_retrans)
3702 tx->tx_cred_wait = jiffies;
3704 GNITX_ASSERTF(tx, tx->tx_id.txe_smsg_id != 0,
3705 "tx with zero id", NULL);
3707 CDEBUG(D_NET, "sending regular msg: %p, type %s(0x%02x), cookie %#llx\n",
3708 tx, kgnilnd_msgtype2str(tx->tx_msg.gnm_type),
3709 tx->tx_msg.gnm_type, tx->tx_id.txe_cookie);
3713 switch (tx->tx_msg.gnm_type) {
3717 case GNILND_MSG_NOOP:
3718 case GNILND_MSG_CLOSE:
3719 case GNILND_MSG_IMMEDIATE:
3720 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
3721 buffer = tx->tx_buffer;
3725 case GNILND_MSG_GET_DONE:
3726 case GNILND_MSG_PUT_DONE:
3727 case GNILND_MSG_PUT_DONE_REV:
3728 case GNILND_MSG_GET_DONE_REV:
3729 case GNILND_MSG_PUT_NAK:
3730 case GNILND_MSG_GET_NAK:
3731 case GNILND_MSG_GET_NAK_REV:
3732 case GNILND_MSG_PUT_NAK_REV:
3733 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
3736 case GNILND_MSG_PUT_REQ:
3737 case GNILND_MSG_GET_REQ_REV:
3738 tx->tx_msg.gnm_u.putreq.gnprm_cookie = tx->tx_id.txe_cookie;
3740 case GNILND_MSG_PUT_ACK:
3741 case GNILND_MSG_PUT_REQ_REV:
3742 case GNILND_MSG_GET_ACK_REV:
3743 case GNILND_MSG_GET_REQ:
3744 /* This is really only to handle the retransmit of SMSG once these
3745 * two messages are setup in send_mapped_tx */
3746 tx->tx_state = GNILND_TX_WAITING_COMPLETION | GNILND_TX_WAITING_REPLY;
3750 if (likely(rc == 0)) {
3751 rc = kgnilnd_sendmsg(tx, buffer, nob, &conn->gnc_list_lock, GNILND_TX_FMAQ);
3755 /* don't explicitly reschedule here - we are short credits and will rely on
3756 * kgnilnd_sendmsg to resched the conn if need be */
3758 } else if (rc < 0) {
3759 /* bail: it wasn't sent and we didn't get EAGAIN indicating we should retrans
3760 * almost certainly a software bug, but lets play nice with the other kids */
3761 kgnilnd_tx_done(tx, rc);
3762 /* just for fun, kick peer in arse - resetting conn might help to correct
3763 * this almost certainly buggy software caused return code */
3764 kgnilnd_close_conn(conn, rc);
3768 CDEBUG(D_NET, "Rescheduling %p (more to do)\n", conn);
3769 kgnilnd_schedule_conn(conn);
3774 kgnilnd_process_rdmaq(kgn_device_t *dev)
3779 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DELAY_RDMAQ)) {
3783 if (time_after_eq(jiffies, dev->gnd_rdmaq_deadline)) {
3784 unsigned long dead_bump;
3787 /* if we think we need to adjust, take lock to serialize and recheck */
3788 spin_lock(&dev->gnd_rdmaq_lock);
3789 if (time_after_eq(jiffies, dev->gnd_rdmaq_deadline)) {
3790 del_singleshot_timer_sync(&dev->gnd_rdmaq_timer);
3792 dead_bump = cfs_time_seconds(1) / *kgnilnd_tunables.kgn_rdmaq_intervals;
3794 /* roll the bucket forward */
3795 dev->gnd_rdmaq_deadline = jiffies + dead_bump;
3797 if (kgnilnd_data.kgn_rdmaq_override &&
3798 (*kgnilnd_tunables.kgn_rdmaq_intervals != 0)) {
3799 new_ok = kgnilnd_data.kgn_rdmaq_override / *kgnilnd_tunables.kgn_rdmaq_intervals;
3804 /* roll current outstanding forward to make sure we carry outstanding
3805 * committment forward
3806 * new_ok starts out as the whole interval value
3807 * - first subtract bytes_out from last interval, as that would push us over
3808 * strict limits for this interval
3809 * - second, set bytes_ok to new_ok to ensure it doesn't exceed the current auth
3811 * there is a small race here if someone is actively processing mappings and
3812 * adding to rdmaq_bytes_out, but it should be small as the mappings are triggered
3813 * quite quickly after kgnilnd_auth_rdma_bytes gives us the go-ahead
3814 * - if this gives us problems in the future, we could use a read/write lock
3815 * to protect the resetting of these values */
3816 new_ok -= atomic64_read(&dev->gnd_rdmaq_bytes_out);
3817 atomic64_set(&dev->gnd_rdmaq_bytes_ok, new_ok);
3819 CDEBUG(D_NET, "resetting rdmaq bytes to %lld, deadline +%lu -> %lu, current out %lld\n",
3820 (s64)atomic64_read(&dev->gnd_rdmaq_bytes_ok), dead_bump, dev->gnd_rdmaq_deadline,
3821 (s64)atomic64_read(&dev->gnd_rdmaq_bytes_out));
3823 spin_unlock(&dev->gnd_rdmaq_lock);
3826 spin_lock(&dev->gnd_rdmaq_lock);
3827 while (!list_empty(&dev->gnd_rdmaq)) {
3830 /* make sure we break out early on quiesce */
3831 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
3832 /* always break with lock held - we unlock outside loop */
3836 tx = list_first_entry(&dev->gnd_rdmaq, kgn_tx_t, tx_list);
3837 kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
3840 /* sample with lock held, serializing with kgnilnd_complete_closed_conn */
3841 if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED) {
3842 /* if conn is dying, mark tx in tx_ref_table for
3843 * kgnilnd_complete_closed_conn to finish up */
3844 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_DYING, 1);
3846 /* tx was moved to DYING, get next */
3849 spin_unlock(&dev->gnd_rdmaq_lock);
3851 rc = kgnilnd_auth_rdma_bytes(dev, tx);
3852 spin_lock(&dev->gnd_rdmaq_lock);
3855 /* no ticket! add back to head */
3856 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_RDMAQ, 0);
3857 /* clear found_work so scheduler threads wait for timer */
3861 /* TX is GO for launch */
3862 tx->tx_qtime = jiffies;
3863 kgnilnd_send_mapped_tx(tx, 0);
3867 spin_unlock(&dev->gnd_rdmaq_lock);
3873 kgnilnd_swab_rdma_desc(kgn_rdma_desc_t *d)
3875 __swab64s(&d->gnrd_key.qword1);
3876 __swab64s(&d->gnrd_key.qword2);
3877 __swab64s(&d->gnrd_addr);
3878 __swab32s(&d->gnrd_nob);
3881 #define kgnilnd_match_reply_either(w, x, y, z) _kgnilnd_match_reply(w, x, y, z)
3882 #define kgnilnd_match_reply(x, y, z) _kgnilnd_match_reply(x, y, GNILND_MSG_NONE, z)
3885 _kgnilnd_match_reply(kgn_conn_t *conn, int type1, int type2, __u64 cookie)
3887 kgn_tx_ev_id_t ev_id;
3890 /* we use the cookie from the original TX, so we can find the match
3891 * by parsing that and using the txe_idx */
3892 ev_id.txe_cookie = cookie;
3894 tx = conn->gnc_tx_ref_table[ev_id.txe_idx];
3897 /* check tx to make sure kgni didn't eat it */
3898 GNITX_ASSERTF(tx, tx->tx_msg.gnm_magic == GNILND_MSG_MAGIC,
3899 "came back from kgni with bad magic %x\n", tx->tx_msg.gnm_magic);
3901 GNITX_ASSERTF(tx, ((tx->tx_id.txe_idx == ev_id.txe_idx) &&
3902 (tx->tx_id.txe_cookie = cookie)),
3903 "conn 0x%p->%s tx_ref_table hosed: wanted "
3904 "txe_cookie %#llx txe_idx %d "
3905 "found tx %p cookie %#llx txe_idx %d\n",
3906 conn, libcfs_nid2str(conn->gnc_peer->gnp_nid),
3907 cookie, ev_id.txe_idx,
3908 tx, tx->tx_id.txe_cookie, tx->tx_id.txe_idx);
3910 LASSERTF((((tx->tx_msg.gnm_type == type1) || (tx->tx_msg.gnm_type == type2)) &&
3911 (tx->tx_state & GNILND_TX_WAITING_REPLY)),
3912 "Unexpected TX type (%x, %x or %x) "
3913 "or state (%x, expected +%x) "
3914 "matched reply from %s\n",
3915 tx->tx_msg.gnm_type, type1, type2,
3916 tx->tx_state, GNILND_TX_WAITING_REPLY,
3917 libcfs_nid2str(conn->gnc_peer->gnp_nid));
3919 CWARN("Unmatched reply %02x, or %02x/%#llx from %s\n",
3920 type1, type2, cookie, libcfs_nid2str(conn->gnc_peer->gnp_nid));
3926 kgnilnd_complete_tx(kgn_tx_t *tx, int rc)
3929 kgn_conn_t *conn = tx->tx_conn;
3930 __u64 nob = tx->tx_nob;
3931 __u32 physnop = tx->tx_phys_npages;
3932 int id = tx->tx_id.txe_smsg_id;
3933 int buftype = tx->tx_buftype;
3934 gni_mem_handle_t hndl;
3935 hndl.qword1 = tx->tx_map_key.qword1;
3936 hndl.qword2 = tx->tx_map_key.qword2;
3938 spin_lock(&conn->gnc_list_lock);
3940 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
3941 "not waiting for reply", NULL);
3944 tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
3946 if (rc == -EFAULT) {
3947 CDEBUG(D_NETERROR, "Error %d TX data: TX %p tx_id %x nob %16llu physnop %8d buffertype %#8x MemHandle %#llx.%#llxx\n",
3948 rc, tx, id, nob, physnop, buftype, hndl.qword1, hndl.qword2);
3950 if(*kgnilnd_tunables.kgn_efault_lbug) {
3951 GNIDBG_TOMSG(D_NETERROR, &tx->tx_msg,
3952 "error %d on tx 0x%p->%s id %u/%d state %s age %ds",
3954 libcfs_nid2str(conn->gnc_peer->gnp_nid) : "<?>",
3955 tx->tx_id.txe_smsg_id, tx->tx_id.txe_idx,
3956 kgnilnd_tx_state2str(tx->tx_list_state),
3957 cfs_duration_sec((unsigned long) jiffies - tx->tx_qtime));
3962 if (!(tx->tx_state & GNILND_TX_WAITING_COMPLETION)) {
3963 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
3964 /* sample under lock as follow on steps require gnc_list_lock
3965 * - or call kgnilnd_tx_done which requires no locks held over
3966 * call to lnet_finalize */
3969 spin_unlock(&conn->gnc_list_lock);
3972 kgnilnd_tx_done(tx, tx->tx_rc);
3977 kgnilnd_finalize_rx_done(kgn_tx_t *tx, kgn_msg_t *msg)
3980 kgn_conn_t *conn = tx->tx_conn;
3982 atomic_inc(&conn->gnc_device->gnd_rdma_nrx);
3983 atomic64_add(tx->tx_nob, &conn->gnc_device->gnd_rdma_rxbytes);
3985 /* the gncm_retval is passed in for PUTs */
3986 rc = kgnilnd_verify_rdma_cksum(tx, msg->gnm_payload_cksum,
3987 msg->gnm_u.completion.gncm_retval);
3989 kgnilnd_complete_tx(tx, rc);
3993 kgnilnd_check_fma_rx(kgn_conn_t *conn)
4001 kgn_peer_t *peer = conn->gnc_peer;
4004 __u16 tmp_cksum = 0, msg_cksum = 0;
4005 int repost = 1, saw_complete;
4006 unsigned long timestamp, newest_last_rx, timeout;
4010 /* Short circuit if the ep_handle is null.
4011 * It's likely that its about to be closed as stale.
4013 if (conn->gnc_ephandle == NULL)
4016 timestamp = jiffies;
4017 kgnilnd_gl_mutex_lock(&conn->gnc_device->gnd_cq_mutex);
4018 /* delay in jiffies - we are really concerned only with things that
4019 * result in a schedule() or really holding this off for long times .
4020 * NB - mutex_lock could spin for 2 jiffies before going to sleep to wait */
4021 conn->gnc_device->gnd_mutex_delay += (long) jiffies - timestamp;
4023 /* Resample current time as we have no idea how long it took to get the mutex */
4024 timestamp = jiffies;
4026 /* We check here when the last time we received an rx, we do this before
4027 * we call getnext in case the thread has been blocked for a while. If we
4028 * havent received an rx since our timeout value we close the connection
4029 * as we should assume the other side has closed the connection. This will
4030 * stop us from sending replies to a mailbox that is already in purgatory.
4033 timeout = cfs_time_seconds(conn->gnc_timeout);
4034 newest_last_rx = GNILND_LASTRX(conn);
4036 /* Error injection to validate that timestamp checking works and closing the conn */
4037 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RECV_TIMEOUT)) {
4038 timestamp = timestamp + (GNILND_TIMEOUTRX(timeout) * 2);
4041 if (time_after_eq(timestamp, newest_last_rx + (GNILND_TIMEOUTRX(timeout)))) {
4042 GNIDBG_CONN(D_NETERROR|D_CONSOLE, conn, "Cant receive from %s after timeout lapse of %lu; TO %lu",
4043 libcfs_nid2str(conn->gnc_peer->gnp_nid),
4044 cfs_duration_sec(timestamp - newest_last_rx),
4045 cfs_duration_sec(GNILND_TIMEOUTRX(timeout)));
4046 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4048 kgnilnd_close_conn(conn, rc);
4052 rrc = kgnilnd_smsg_getnext(conn->gnc_ephandle, &prefix);
4054 if (rrc == GNI_RC_NOT_DONE) {
4055 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4056 CDEBUG(D_INFO, "SMSG RX empty conn 0x%p\n", conn);
4060 /* Instead of asserting when we get mailbox corruption lets attempt to
4061 * close the conn and recover. We can put the conn/mailbox into
4062 * purgatory and let purgatory deal with the problem. If we see
4063 * this NETTERROR reported on production systems in large amounts
4064 * we will need to revisit the state machine to see if we can tighten
4065 * it up further to improve data protection.
4068 if (rrc == GNI_RC_INVALID_STATE) {
4069 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4070 GNIDBG_CONN(D_NETERROR | D_CONSOLE, conn, "Mailbox corruption "
4071 "detected closing conn %p from peer %s\n", conn,
4072 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4074 kgnilnd_close_conn(conn, rc);
4078 LASSERTF(rrc == GNI_RC_SUCCESS,
4079 "bad rc %d on conn %p from peer %s\n",
4080 rrc, conn, libcfs_nid2str(peer->gnp_nid));
4082 msg = (kgn_msg_t *)prefix;
4084 rx = kgnilnd_alloc_rx();
4086 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4087 kgnilnd_release_msg(conn);
4088 GNIDBG_MSG(D_NETERROR, msg, "Dropping SMSG RX from 0x%p->%s, no RX memory",
4089 conn, libcfs_nid2str(peer->gnp_nid));
4093 GNIDBG_MSG(D_INFO, msg, "SMSG RX on %p", conn);
4095 timestamp = conn->gnc_last_rx;
4096 seq = last_seq = atomic_read(&conn->gnc_rx_seq);
4097 atomic_inc(&conn->gnc_rx_seq);
4099 conn->gnc_last_rx = jiffies;
4100 /* stash first rx so we can clear out purgatory
4102 if (conn->gnc_first_rx == 0)
4103 conn->gnc_first_rx = jiffies;
4105 /* needs to linger to protect gnc_rx_seq like we do with gnc_tx_seq */
4106 kgnilnd_gl_mutex_unlock(&conn->gnc_device->gnd_cq_mutex);
4107 kgnilnd_peer_alive(conn->gnc_peer);
4110 rx->grx_conn = conn;
4112 ktime_get_ts64(&rx->grx_received);
4114 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_NET_LOOKUP)) {
4117 rc = kgnilnd_find_net(msg->gnm_srcnid, &net);
4123 kgnilnd_net_decref(net);
4126 if (*kgnilnd_tunables.kgn_checksum && !msg->gnm_cksum)
4127 GNIDBG_MSG(D_WARNING, msg, "no msg header checksum when enabled");
4129 /* XXX Nic: Do we need to swab cksum */
4130 if (msg->gnm_cksum != 0) {
4131 msg_cksum = msg->gnm_cksum;
4133 tmp_cksum = kgnilnd_cksum(msg, sizeof(kgn_msg_t));
4135 if (tmp_cksum != msg_cksum) {
4136 GNIDBG_MSG(D_NETERROR, msg, "Bad hdr checksum (%x expected %x)",
4137 tmp_cksum, msg_cksum);
4138 kgnilnd_dump_msg(D_BUFFS, msg);
4143 /* restore checksum for future debug messages */
4144 msg->gnm_cksum = tmp_cksum;
4146 if (msg->gnm_magic != GNILND_MSG_MAGIC) {
4147 if (__swab32(msg->gnm_magic) != GNILND_MSG_MAGIC) {
4148 GNIDBG_MSG(D_NETERROR, msg, "Unexpected magic %08x from %s",
4149 msg->gnm_magic, libcfs_nid2str(peer->gnp_nid));
4154 __swab32s(&msg->gnm_magic);
4155 __swab16s(&msg->gnm_version);
4156 __swab16s(&msg->gnm_type);
4157 __swab64s(&msg->gnm_srcnid);
4158 __swab64s(&msg->gnm_connstamp);
4159 __swab32s(&msg->gnm_seq);
4161 /* NB message type checked below; NOT here... */
4162 switch (msg->gnm_type) {
4163 case GNILND_MSG_GET_ACK_REV:
4164 case GNILND_MSG_PUT_ACK:
4165 kgnilnd_swab_rdma_desc(&msg->gnm_u.putack.gnpam_desc);
4168 case GNILND_MSG_PUT_REQ_REV:
4169 case GNILND_MSG_GET_REQ:
4170 kgnilnd_swab_rdma_desc(&msg->gnm_u.get.gngm_desc);
4178 if (msg->gnm_version != GNILND_MSG_VERSION) {
4179 GNIDBG_MSG(D_NETERROR, msg, "Unexpected protocol version %d from %s",
4180 msg->gnm_version, libcfs_nid2str(peer->gnp_nid));
4185 if (LNET_NIDADDR(msg->gnm_srcnid) != LNET_NIDADDR(peer->gnp_nid)) {
4186 GNIDBG_MSG(D_NETERROR, msg, "Unexpected peer %s from %s",
4187 libcfs_nid2str(msg->gnm_srcnid),
4188 libcfs_nid2str(peer->gnp_nid));
4193 if (msg->gnm_connstamp != conn->gnc_peer_connstamp) {
4194 GNIDBG_MSG(D_NETERROR, msg, "Unexpected connstamp %#llx(%#llx"
4195 " expected) from %s",
4196 msg->gnm_connstamp, conn->gnc_peer_connstamp,
4197 libcfs_nid2str(peer->gnp_nid));
4202 if (msg->gnm_seq != seq) {
4203 GNIDBG_MSG(D_NETERROR, msg, "Unexpected sequence number %d(%d expected) from %s",
4204 msg->gnm_seq, seq, libcfs_nid2str(peer->gnp_nid));
4209 atomic_inc(&conn->gnc_device->gnd_short_nrx);
4211 if (msg->gnm_type == GNILND_MSG_CLOSE) {
4212 CDEBUG(D_NETTRACE, "%s sent us CLOSE msg\n",
4213 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4214 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
4215 conn->gnc_close_recvd = GNILND_CLOSE_RX;
4216 conn->gnc_peer_error = msg->gnm_u.completion.gncm_retval;
4217 /* double check state with lock held */
4218 if (conn->gnc_state == GNILND_CONN_ESTABLISHED) {
4219 /* only error if we are not already closing */
4220 if (conn->gnc_peer_error == -ETIMEDOUT) {
4221 unsigned long now = jiffies;
4222 CNETERR("peer 0x%p->%s closed connection 0x%p due to timeout. "
4224 "RX %d @ %lus/%lus; TX %d @ %lus/%lus; "
4225 "NOOP %lus/%lus/%lus; sched %lus/%lus/%lus ago\n",
4226 conn->gnc_peer, libcfs_nid2str(conn->gnc_peer->gnp_nid),
4228 cfs_duration_sec(now - timestamp),
4229 cfs_duration_sec(now - conn->gnc_last_rx_cq),
4230 atomic_read(&conn->gnc_tx_seq),
4231 cfs_duration_sec(now - conn->gnc_last_tx),
4232 cfs_duration_sec(now - conn->gnc_last_tx_cq),
4233 cfs_duration_sec(now - conn->gnc_last_noop_want),
4234 cfs_duration_sec(now - conn->gnc_last_noop_sent),
4235 cfs_duration_sec(now - conn->gnc_last_noop_cq),
4236 cfs_duration_sec(now - conn->gnc_last_sched_ask),
4237 cfs_duration_sec(now - conn->gnc_last_sched_do),
4238 cfs_duration_sec(now - conn->gnc_device->gnd_sched_alive));
4240 kgnilnd_close_conn_locked(conn, -ECONNRESET);
4242 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
4246 if (conn->gnc_close_recvd) {
4247 GNIDBG_MSG(D_NETERROR, msg, "Unexpected message %s(%d/%d) after CLOSE from %s",
4248 kgnilnd_msgtype2str(msg->gnm_type),
4249 msg->gnm_type, conn->gnc_close_recvd,
4250 libcfs_nid2str(conn->gnc_peer->gnp_nid));
4255 if (conn->gnc_state != GNILND_CONN_ESTABLISHED) {
4256 /* XXX Nic: log message received on bad connection state */
4260 switch (msg->gnm_type) {
4261 case GNILND_MSG_NOOP:
4262 /* Nothing to do; just a keepalive */
4265 case GNILND_MSG_IMMEDIATE:
4266 /* only get SMSG payload for IMMEDIATE */
4267 atomic64_add(msg->gnm_payload_len, &conn->gnc_device->gnd_short_rxbytes);
4268 rc = lnet_parse(net->gnn_ni, &msg->gnm_u.immediate.gnim_hdr,
4269 msg->gnm_srcnid, rx, 0);
4272 case GNILND_MSG_GET_REQ_REV:
4273 case GNILND_MSG_PUT_REQ:
4274 rc = lnet_parse(net->gnn_ni, &msg->gnm_u.putreq.gnprm_hdr,
4275 msg->gnm_srcnid, rx, 1);
4278 case GNILND_MSG_GET_NAK_REV:
4279 tx = kgnilnd_match_reply_either(conn, GNILND_MSG_GET_REQ_REV, GNILND_MSG_GET_ACK_REV,
4280 msg->gnm_u.completion.gncm_cookie);
4284 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4286 case GNILND_MSG_PUT_NAK:
4287 tx = kgnilnd_match_reply_either(conn, GNILND_MSG_PUT_REQ, GNILND_MSG_PUT_ACK,
4288 msg->gnm_u.completion.gncm_cookie);
4292 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4294 case GNILND_MSG_PUT_ACK:
4295 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ,
4296 msg->gnm_u.putack.gnpam_src_cookie);
4300 /* store putack data for later: deferred rdma or re-try */
4301 tx->tx_putinfo = msg->gnm_u.putack;
4304 spin_lock(&tx->tx_conn->gnc_list_lock);
4306 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
4307 "not waiting for reply", NULL);
4309 tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
4311 if (likely(!(tx->tx_state & GNILND_TX_WAITING_COMPLETION))) {
4312 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
4313 /* sample under lock as follow on steps require gnc_list_lock
4314 * - or call kgnilnd_tx_done which requires no locks held over
4315 * call to lnet_finalize */
4318 /* cannot launch rdma if still waiting for fma-msg completion */
4319 CDEBUG(D_NET, "tx 0x%p type 0x%02x will need to "
4320 "wait for SMSG completion\n", tx, tx->tx_msg.gnm_type);
4321 tx->tx_state |= GNILND_TX_PENDING_RDMA;
4323 spin_unlock(&tx->tx_conn->gnc_list_lock);
4326 rc = kgnilnd_send_mapped_tx(tx, 0);
4328 kgnilnd_tx_done(tx, rc);
4331 case GNILND_MSG_GET_ACK_REV:
4332 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ_REV,
4333 msg->gnm_u.putack.gnpam_src_cookie);
4337 /* store putack data for later: deferred rdma or re-try */
4338 tx->tx_putinfo = msg->gnm_u.putack;
4340 spin_lock(&tx->tx_conn->gnc_list_lock);
4342 GNITX_ASSERTF(tx, tx->tx_state & GNILND_TX_WAITING_REPLY,
4343 "not waiting for reply", NULL);
4345 tx->tx_state &= ~GNILND_TX_WAITING_REPLY;
4347 if (likely(!(tx->tx_state & GNILND_TX_WAITING_COMPLETION))) {
4348 kgnilnd_tx_del_state_locked(tx, NULL, conn, GNILND_TX_ALLOCD);
4349 /* sample under lock as follow on steps require gnc_list_lock
4350 * - or call kgnilnd_tx_done which requires no locks held over
4351 * call to lnet_finalize */
4354 /* cannot launch rdma if still waiting for fma-msg completion */
4355 CDEBUG(D_NET, "tx 0x%p type 0x%02x will need to "
4356 "wait for SMSG completion\n", tx, tx->tx_msg.gnm_type);
4357 tx->tx_state |= GNILND_TX_PENDING_RDMA;
4359 spin_unlock(&tx->tx_conn->gnc_list_lock);
4362 rc = kgnilnd_send_mapped_tx(tx, 0);
4364 kgnilnd_tx_done(tx, rc);
4367 case GNILND_MSG_PUT_DONE:
4368 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_ACK,
4369 msg->gnm_u.completion.gncm_cookie);
4373 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
4374 "bad tx buftype %d", tx->tx_buftype);
4376 kgnilnd_finalize_rx_done(tx, msg);
4378 case GNILND_MSG_PUT_REQ_REV:
4379 case GNILND_MSG_GET_REQ:
4380 rc = lnet_parse(net->gnn_ni, &msg->gnm_u.get.gngm_hdr,
4381 msg->gnm_srcnid, rx, 1);
4385 case GNILND_MSG_GET_NAK:
4386 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ,
4387 msg->gnm_u.completion.gncm_cookie);
4391 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
4392 "bad tx buftype %d", tx->tx_buftype);
4394 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4397 case GNILND_MSG_GET_DONE:
4398 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_REQ,
4399 msg->gnm_u.completion.gncm_cookie);
4403 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
4404 "bad tx buftype %d", tx->tx_buftype);
4406 lnet_set_reply_msg_len(net->gnn_ni, tx->tx_lntmsg[1],
4407 msg->gnm_u.completion.gncm_retval);
4409 kgnilnd_finalize_rx_done(tx, msg);
4411 case GNILND_MSG_GET_DONE_REV:
4412 tx = kgnilnd_match_reply(conn, GNILND_MSG_GET_ACK_REV,
4413 msg->gnm_u.completion.gncm_cookie);
4417 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
4418 "bad tx buftype %d", tx->tx_buftype);
4420 kgnilnd_finalize_rx_done(tx, msg);
4423 case GNILND_MSG_PUT_DONE_REV:
4424 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ_REV,
4425 msg->gnm_u.completion.gncm_cookie);
4430 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
4431 "bad tx buftype %d", tx->tx_buftype);
4433 kgnilnd_finalize_rx_done(tx, msg);
4435 case GNILND_MSG_PUT_NAK_REV:
4436 tx = kgnilnd_match_reply(conn, GNILND_MSG_PUT_REQ_REV,
4437 msg->gnm_u.completion.gncm_cookie);
4442 GNITX_ASSERTF(tx, tx->tx_buftype == GNILND_BUF_PHYS_MAPPED,
4443 "bad tx buftype %d", tx->tx_buftype);
4445 kgnilnd_complete_tx(tx, msg->gnm_u.completion.gncm_retval);
4450 if (rc < 0) /* protocol/comms error */
4451 kgnilnd_close_conn(conn, rc);
4453 if (repost && rx != NULL) {
4454 kgnilnd_consume_rx(rx);
4457 /* we got an event so assume more there and call for reschedule */
4459 kgnilnd_schedule_conn(conn);
4463 /* Do the failure injections that we need to affect conn processing in the following function.
4464 * When writing tests that use this function make sure to use a fail_loc with a fail mask.
4465 * If you dont you can cause the scheduler threads to spin on the conn without it leaving
4468 * intent is used to signal the calling function whether or not the conn needs to be rescheduled.
4472 kgnilnd_check_conn_fail_loc(kgn_device_t *dev, kgn_conn_t *conn, int *intent)
4476 /* short circuit out when not set */
4477 if (likely(!cfs_fail_loc)) {
4481 /* failure injection to test for stack reset clean ups */
4482 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DROP_CLOSING)) {
4483 /* we can't rely on busy loops being nice enough to get the
4484 * stack reset triggered - it'd just spin on this conn */
4485 CFS_RACE(CFS_FAIL_GNI_DROP_CLOSING);
4488 GOTO(did_fail_loc, rc);
4491 if (conn->gnc_state == GNILND_CONN_DESTROY_EP) {
4492 /* DESTROY_EP set in kgnilnd_conn_decref on gnc_refcount = 1 */
4494 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_DROP_DESTROY_EP)) {
4495 CFS_RACE(CFS_FAIL_GNI_DROP_DESTROY_EP);
4498 GOTO(did_fail_loc, rc);
4502 /* CFS_FAIL_GNI_FINISH_PURG2 is used to stop a connection from fully closing. This scheduler
4503 * will spin on the CFS_FAIL_TIMEOUT until the fail_loc is cleared at which time the connection
4504 * will be closed by kgnilnd_complete_closed_conn.
4506 if ((conn->gnc_state == GNILND_CONN_CLOSED) && CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG2)) {
4507 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_FINISH_PURG2, 1)) {};
4510 GOTO(did_fail_loc, rc);
4513 /* this one is a bit gross - we can't hold the mutex from process_conns
4514 * across a CFS_RACE here - it'd block the conn threads from doing an ep_bind
4515 * and moving onto finish_connect
4516 * so, we'll just set the rc - kgnilnd_process_conns will clear
4517 * found_work on a fail_loc, getting the scheduler thread to call schedule()
4518 * and effectively getting this thread to sleep */
4519 if ((conn->gnc_state == GNILND_CONN_CLOSED) && CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG)) {
4522 GOTO(did_fail_loc, rc);
4530 kgnilnd_send_conn_close(kgn_conn_t *conn)
4534 /* we are closing the conn - we will try to send the CLOSE msg
4535 * but will not wait for anything else to flush */
4537 /* send the close if not already done so or received one */
4538 if (!conn->gnc_close_sent && !conn->gnc_close_recvd) {
4539 /* set close_sent regardless of the success of the
4540 * CLOSE message. We are going to try once and then
4541 * kick him out of the sandbox */
4542 conn->gnc_close_sent = 1;
4545 /* EP might be null already if remote side initiated a new connection.
4546 * kgnilnd_finish_connect destroys existing ep_handles before wiring up the new connection,
4547 * so this check is here to make sure we dont attempt to send with a null ep_handle.
4549 if (conn->gnc_ephandle != NULL) {
4552 tx = kgnilnd_new_tx_msg(GNILND_MSG_CLOSE, conn->gnc_peer->gnp_net->gnn_ni->ni_nid);
4554 tx->tx_msg.gnm_u.completion.gncm_retval = conn->gnc_error;
4555 tx->tx_state = GNILND_TX_WAITING_COMPLETION;
4556 tx->tx_qtime = jiffies;
4558 if (tx->tx_id.txe_idx == 0) {
4559 rc = kgnilnd_set_tx_id(tx, conn);
4561 kgnilnd_tx_done(tx, rc);
4565 CDEBUG(D_NETTRACE, "sending close with errno %d\n",
4568 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CLOSE_SEND)) {
4569 kgnilnd_tx_done(tx, -EAGAIN);
4571 rc = kgnilnd_sendmsg(tx, NULL, 0, NULL, GNILND_TX_FMAQ);
4573 /* It wasnt sent and we dont care. */
4574 kgnilnd_tx_done(tx, rc);
4582 /* When changing gnc_state we need to take the kgn_peer_conn_lock */
4583 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
4584 conn->gnc_state = GNILND_CONN_CLOSED;
4585 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
4586 /* mark this conn as CLOSED now that we processed it
4587 * do after TX, so we can use CLOSING in asserts */
4591 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_RX_CLOSE_CLOSED)) {
4592 /* simulate a RX CLOSE after the timeout but before
4593 * the scheduler thread gets it */
4594 conn->gnc_close_recvd = GNILND_CLOSE_INJECT2;
4595 conn->gnc_peer_error = -ETIMEDOUT;
4597 /* schedule to allow potential CLOSE and get the complete phase run */
4598 kgnilnd_schedule_conn(conn);
4602 kgnilnd_process_mapped_tx(kgn_device_t *dev)
4607 int fast_remaps = GNILND_FAST_MAPPING_TRY;
4608 int log_retrans, log_retrans_level;
4609 static int last_map_version;
4612 spin_lock(&dev->gnd_lock);
4613 if (list_empty(&dev->gnd_map_tx)) {
4614 /* if the list is empty make sure we dont have a timer running */
4615 del_singleshot_timer_sync(&dev->gnd_map_timer);
4616 spin_unlock(&dev->gnd_lock);
4620 dev->gnd_sched_alive = jiffies;
4622 /* we'll retry as fast as possible up to 25% of the limit, then we start
4623 * backing off until our map version changes - indicating we unmapped
4625 tx = list_first_entry(&dev->gnd_map_tx, kgn_tx_t, tx_list);
4626 if (likely(dev->gnd_map_attempt == 0) ||
4627 time_after_eq(jiffies, dev->gnd_next_map) ||
4628 last_map_version != dev->gnd_map_version) {
4630 /* if this is our first attempt at mapping set last mapped to current
4631 * jiffies so we can timeout our attempt correctly.
4633 if (dev->gnd_map_attempt == 0)
4634 dev->gnd_last_map = jiffies;
4636 GNIDBG_TX(D_NET, tx, "waiting for mapping event event to retry", NULL);
4637 spin_unlock(&dev->gnd_lock);
4641 /* delete the previous timer if it exists */
4642 del_singleshot_timer_sync(&dev->gnd_map_timer);
4643 /* stash the last map version to let us know when a good one was seen */
4644 last_map_version = dev->gnd_map_version;
4646 /* we need to to take the lock and continually refresh the head of the list as
4647 * kgnilnd_complete_closed_conn might be nuking stuff and we are cycling the lock
4648 * allowing them to squeeze in */
4650 while (!list_empty(&dev->gnd_map_tx)) {
4651 /* make sure we break out early on quiesce */
4652 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
4653 /* always break with lock held - we unlock outside loop */
4657 tx = list_first_entry(&dev->gnd_map_tx, kgn_tx_t, tx_list);
4659 kgnilnd_tx_del_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_ALLOCD);
4662 /* sample with lock held, serializing with kgnilnd_complete_closed_conn */
4663 if (tx->tx_conn->gnc_state != GNILND_CONN_ESTABLISHED) {
4664 /* if conn is dying, mark tx in tx_ref_table for
4665 * kgnilnd_complete_closed_conn to finish up */
4666 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_DYING, 1);
4669 /* tx was moved to DYING, get next */
4673 spin_unlock(&dev->gnd_lock);
4674 rc = kgnilnd_send_mapped_tx(tx, 1);
4676 /* We made it! skip error handling.. */
4678 /* OK to continue on +ve errors as it won't get seen until
4679 * this function is called again - we operate on a copy of the original
4680 * list and not the live list */
4681 spin_lock(&dev->gnd_lock);
4682 /* reset map attempts back to zero we successfully
4683 * mapped so we can reset our timers */
4684 dev->gnd_map_attempt = 0;
4686 } else if (rc == -EAGAIN) {
4687 spin_lock(&dev->gnd_lock);
4688 mod_timer(&dev->gnd_map_timer, dev->gnd_next_map);
4689 spin_unlock(&dev->gnd_lock);
4690 GOTO(get_out_mapped, rc);
4691 } else if (rc != -ENOMEM) {
4692 /* carp, failure we can't handle */
4693 kgnilnd_tx_done(tx, rc);
4694 spin_lock(&dev->gnd_lock);
4695 /* reset map attempts back to zero we dont know what happened but it
4696 * wasnt a failed mapping
4698 dev->gnd_map_attempt = 0;
4702 /* time to handle the retry cases.. lock so we dont have 2 threads
4703 * mucking with gnd_map_attempt, or gnd_next_map at the same time.
4705 spin_lock(&dev->gnd_lock);
4706 dev->gnd_map_attempt++;
4707 if (dev->gnd_map_attempt < fast_remaps) {
4708 /* do nothing we just want it to go as fast as possible.
4709 * just set gnd_next_map to current jiffies so it will process
4710 * as fast as possible.
4712 dev->gnd_next_map = jiffies;
4714 /* Retry based on GNILND_MAP_RETRY_RATE */
4715 dev->gnd_next_map = jiffies + GNILND_MAP_RETRY_RATE;
4718 /* only log occasionally once we've retried fast_remaps */
4719 log_retrans = (dev->gnd_map_attempt >= fast_remaps) &&
4720 ((dev->gnd_map_attempt % fast_remaps) == 0);
4721 log_retrans_level = log_retrans ? D_NETERROR : D_NET;
4723 /* make sure we are not off in the weeds with this tx */
4724 if (time_after(jiffies, dev->gnd_last_map + GNILND_MAP_TIMEOUT)) {
4725 GNIDBG_TX(D_NETERROR, tx,
4726 "giving up on TX, too many retries", NULL);
4727 spin_unlock(&dev->gnd_lock);
4728 if (tx->tx_msg.gnm_type == GNILND_MSG_PUT_REQ ||
4729 tx->tx_msg.gnm_type == GNILND_MSG_GET_REQ_REV) {
4730 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type,
4732 tx->tx_putinfo.gnpam_dst_cookie,
4733 tx->tx_msg.gnm_srcnid);
4735 kgnilnd_nak_rdma(tx->tx_conn, tx->tx_msg.gnm_type,
4737 tx->tx_getinfo.gngm_cookie,
4738 tx->tx_msg.gnm_srcnid);
4740 kgnilnd_tx_done(tx, -ENOMEM);
4741 GOTO(get_out_mapped, rc);
4743 GNIDBG_TX(log_retrans_level, tx,
4744 "transient map failure #%d %d pages/%d bytes phys %u@%u "
4745 "nq_map %d mdd# %d/%d GART %ld",
4746 dev->gnd_map_attempt, tx->tx_phys_npages, tx->tx_nob,
4747 dev->gnd_map_nphys, dev->gnd_map_physnop * PAGE_SIZE,
4748 atomic_read(&dev->gnd_nq_map),
4749 atomic_read(&dev->gnd_n_mdd), atomic_read(&dev->gnd_n_mdd_held),
4750 atomic64_read(&dev->gnd_nbytes_map));
4753 /* we need to stop processing the rest of the list, so add it back in */
4754 /* set timer to wake device when we need to schedule this tx */
4755 mod_timer(&dev->gnd_map_timer, dev->gnd_next_map);
4756 kgnilnd_tx_add_state_locked(tx, NULL, tx->tx_conn, GNILND_TX_MAPQ, 0);
4757 spin_unlock(&dev->gnd_lock);
4758 GOTO(get_out_mapped, rc);
4760 spin_unlock(&dev->gnd_lock);
4766 kgnilnd_process_conns(kgn_device_t *dev, unsigned long deadline)
4771 int error_inject = 0;
4775 spin_lock(&dev->gnd_lock);
4776 while (!list_empty(&dev->gnd_ready_conns) && time_before(jiffies, deadline)) {
4777 dev->gnd_sched_alive = jiffies;
4781 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
4782 /* break with lock held */
4786 conn = list_first_entry(&dev->gnd_ready_conns, kgn_conn_t, gnc_schedlist);
4787 list_del_init(&conn->gnc_schedlist);
4789 * Since we are processing conn now, we don't need to be on the delaylist any longer.
4792 if (!list_empty(&conn->gnc_delaylist))
4793 list_del_init(&conn->gnc_delaylist);
4794 spin_unlock(&dev->gnd_lock);
4796 conn_sched = xchg(&conn->gnc_scheduled, GNILND_CONN_PROCESS);
4798 LASSERTF(conn_sched != GNILND_CONN_IDLE &&
4799 conn_sched != GNILND_CONN_PROCESS,
4800 "conn %p on ready list but in bad state: %d\n",
4803 CDEBUG(D_INFO, "conn %p@%s for processing\n",
4804 conn, kgnilnd_conn_state2str(conn));
4807 set_mb(conn->gnc_last_sched_do, jiffies);
4809 if (kgnilnd_check_conn_fail_loc(dev, conn, &intent)) {
4811 /* based on intent see if we should run again. */
4812 rc = kgnilnd_schedule_process_conn(conn, intent);
4814 /* drop ref from gnd_ready_conns */
4815 if (atomic_read(&conn->gnc_refcount) == 1 && rc != 1) {
4816 down_write(&dev->gnd_conn_sem);
4817 kgnilnd_conn_decref(conn);
4818 up_write(&dev->gnd_conn_sem);
4819 } else if (rc != 1) {
4820 kgnilnd_conn_decref(conn);
4822 /* clear this so that scheduler thread doesn't spin */
4824 /* break with lock held... */
4825 spin_lock(&dev->gnd_lock);
4829 if (unlikely(conn->gnc_state == GNILND_CONN_CLOSED)) {
4830 down_write(&dev->gnd_conn_sem);
4832 /* CONN_CLOSED set in procces_fmaq when CLOSE is sent */
4833 if (unlikely(atomic_read(&conn->gnc_tx_in_use))) {
4834 /* If there are tx's currently in use in another
4835 * thread we dont want to complete the close
4836 * yet. Cycle this conn back through
4838 kgnilnd_schedule_conn(conn);
4840 kgnilnd_complete_closed_conn(conn);
4842 up_write(&dev->gnd_conn_sem);
4843 } else if (unlikely(conn->gnc_state == GNILND_CONN_DESTROY_EP)) {
4844 /* DESTROY_EP set in kgnilnd_conn_decref on gnc_refcount = 1 */
4845 /* serialize SMSG CQs with ep_bind and smsg_release */
4846 down_write(&dev->gnd_conn_sem);
4847 kgnilnd_destroy_conn_ep(conn);
4848 up_write(&dev->gnd_conn_sem);
4849 } else if (unlikely(conn->gnc_state == GNILND_CONN_CLOSING)) {
4850 /* if we need to do some CLOSE sending, etc done here do it */
4851 down_write(&dev->gnd_conn_sem);
4852 kgnilnd_send_conn_close(conn);
4853 kgnilnd_check_fma_rx(conn);
4854 up_write(&dev->gnd_conn_sem);
4855 } else if (atomic_read(&conn->gnc_peer->gnp_dirty_eps) == 0) {
4856 /* start moving traffic if the old conns are cleared out */
4857 down_read(&dev->gnd_conn_sem);
4858 kgnilnd_check_fma_rx(conn);
4859 kgnilnd_process_fmaq(conn);
4860 up_read(&dev->gnd_conn_sem);
4863 rc = kgnilnd_schedule_process_conn(conn, 0);
4865 /* drop ref from gnd_ready_conns */
4866 if (atomic_read(&conn->gnc_refcount) == 1 && rc != 1) {
4867 down_write(&dev->gnd_conn_sem);
4868 kgnilnd_conn_decref(conn);
4869 up_write(&dev->gnd_conn_sem);
4870 } else if (rc != 1) {
4871 kgnilnd_conn_decref(conn);
4874 /* check list again with lock held */
4875 spin_lock(&dev->gnd_lock);
4878 /* If we are short circuiting due to timing we want to be scheduled
4879 * as soon as possible.
4881 if (!list_empty(&dev->gnd_ready_conns) && !error_inject)
4884 spin_unlock(&dev->gnd_lock);
4890 kgnilnd_scheduler(void *arg)
4892 int threadno = (long)arg;
4895 unsigned long deadline = 0;
4898 dev = &kgnilnd_data.kgn_devices[(threadno + 1) % kgnilnd_data.kgn_ndevs];
4900 /* all gnilnd threads need to run fairly urgently */
4901 set_user_nice(current, *kgnilnd_tunables.kgn_sched_nice);
4902 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
4903 while (!kgnilnd_data.kgn_shutdown) {
4905 /* Safe: kgn_shutdown only set when quiescent */
4907 /* to quiesce or to not quiesce, that is the question */
4909 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
4910 KGNILND_SPIN_QUIESCE;
4913 /* tracking for when thread goes AWOL */
4914 dev->gnd_sched_alive = jiffies;
4916 CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_SCHED_DEADLINE,
4917 (*kgnilnd_tunables.kgn_sched_timeout + 1));
4918 /* let folks know we are up and kicking
4919 * - they can use this for latency savings, etc
4920 * - only change if IRQ, if IDLE leave alone as that
4921 * schedule_device calls to put us back to IRQ */
4922 (void)cmpxchg(&dev->gnd_ready, GNILND_DEV_IRQ, GNILND_DEV_LOOP);
4924 down_read(&dev->gnd_conn_sem);
4925 /* always check these - they are super low cost */
4926 found_work += kgnilnd_check_fma_send_cq(dev);
4927 found_work += kgnilnd_check_fma_rcv_cq(dev);
4929 /* rdma CQ doesn't care about eps */
4930 found_work += kgnilnd_check_rdma_cq(dev);
4932 /* move some RDMA ? */
4933 found_work += kgnilnd_process_rdmaq(dev);
4935 /* map some pending RDMA requests ? */
4936 found_work += kgnilnd_process_mapped_tx(dev);
4938 /* the EP for a conn is not destroyed until all the references
4939 * to it are gone, so these checks should be safe
4940 * even if run in parallel with the CQ checking functions
4941 * _AND_ a thread that processes the CLOSED->DONE
4945 up_read(&dev->gnd_conn_sem);
4947 /* process all conns ready now */
4948 found_work += kgnilnd_process_conns(dev, deadline);
4950 /* do an eager check to avoid the IRQ disabling in
4951 * prepare_to_wait and friends */
4954 (busy_loops++ < *kgnilnd_tunables.kgn_loops) &&
4955 time_before(jiffies, deadline)) {
4957 if ((busy_loops % 10) == 0) {
4958 /* tickle heartbeat and watchdog to ensure our
4959 * piggishness doesn't turn into heartbeat failure */
4960 touch_nmi_watchdog();
4966 /* if we got here, found_work was zero or busy_loops means we
4967 * need to take a break. We'll clear gnd_ready but we'll check
4968 * one last time if there is an IRQ that needs processing */
4970 prepare_to_wait(&dev->gnd_waitq, &wait, TASK_INTERRUPTIBLE);
4972 /* the first time this will go LOOP -> IDLE and let us do one final check
4973 * during which we might get an IRQ, then IDLE->IDLE and schedule()
4974 * - this might allow other threads to block us for a bit if they
4975 * try to get the mutex, but that is good as we'd need to wake
4976 * up soon to handle the CQ or other processing anyways */
4978 found_work += xchg(&dev->gnd_ready, GNILND_DEV_IDLE);
4980 if ((busy_loops >= *kgnilnd_tunables.kgn_loops) ||
4981 time_after_eq(jiffies, deadline)) {
4983 "yeilding: found_work %d busy_loops %d\n",
4984 found_work, busy_loops);
4986 /* use yield if we are bailing due to busy_loops
4987 * - this will ensure we wake up soonish. This closes
4988 * a race with kgnilnd_device_callback - where it'd
4989 * not call wake_up() because gnd_ready == 1, but then
4990 * we come down and schedule() because of busy_loops.
4991 * We'd not be woken up until something poked our waitq
4992 * again. yield() ensures we wake up without another
4993 * waitq poke in that case */
4994 atomic_inc(&dev->gnd_n_yield);
4995 kgnilnd_data.kgn_last_condresched = jiffies;
4997 CDEBUG(D_INFO, "awake after yeild\n");
4998 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
4999 } else if (found_work == GNILND_DEV_IDLE) {
5000 /* busy_loops is low and there is nothing to do,
5001 * go to sleep and wait for a waitq poke */
5003 "scheduling: found_work %d busy_loops %d\n",
5004 found_work, busy_loops);
5005 atomic_inc(&dev->gnd_n_schedule);
5006 kgnilnd_data.kgn_last_scheduled = jiffies;
5008 CDEBUG(D_INFO, "awake after schedule\n");
5009 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_sched_timeout);
5011 finish_wait(&dev->gnd_waitq, &wait);
5014 kgnilnd_thread_fini();