2 * Copyright (C) 2012 Cray, Inc.
4 * Copyright (c) 2014, Intel Corporation.
6 * Author: Nic Henke <nic@cray.com>
7 * Author: James Shimek <jshimek@cray.com>
9 * This file is part of Lustre, http://www.lustre.org.
11 * Lustre is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
15 * Lustre is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with Lustre; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 kgnilnd_setup_smsg_attr(gni_smsg_attr_t *smsg_attr)
31 smsg_attr->mbox_maxcredit = *kgnilnd_tunables.kgn_mbox_credits;
32 smsg_attr->msg_maxsize = GNILND_MAX_MSG_SIZE;
33 smsg_attr->msg_type = GNI_SMSG_TYPE_MBOX_AUTO_RETRANSMIT;
37 kgnilnd_map_fmablk(kgn_device_t *device, kgn_fma_memblock_t *fma_blk)
40 __u32 flags = GNI_MEM_READWRITE;
41 static unsigned long reg_to;
42 int rfto = *kgnilnd_tunables.kgn_reg_fail_timeout;
44 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS) {
45 flags |= GNI_MEM_PHYS_CONT;
48 fma_blk->gnm_hold_timeout = 0;
50 /* make sure we are mapping a clean block */
51 LASSERTF(fma_blk->gnm_hndl.qword1 == 0UL, "fma_blk %p dirty\n", fma_blk);
53 rrc = kgnilnd_mem_register(device->gnd_handle, (__u64)fma_blk->gnm_block,
54 fma_blk->gnm_blk_size, device->gnd_rcv_fma_cqh,
55 flags, &fma_blk->gnm_hndl);
56 if (rrc != GNI_RC_SUCCESS) {
57 if (rfto != GNILND_REGFAILTO_DISABLE) {
59 reg_to = jiffies + cfs_time_seconds(rfto);
60 } else if (time_after(jiffies, reg_to)) {
61 CERROR("FATAL:fmablk registration has failed "
63 cfs_duration_sec(jiffies - reg_to) +
69 CNETERR("register fmablk failed 0x%p mbox_size %d flags %u\n",
70 fma_blk, fma_blk->gnm_mbox_size, flags);
76 /* PHYS_CONT memory isn't really mapped, at least not in GART -
77 * but all mappings chew up a MDD
79 if (fma_blk->gnm_state != GNILND_FMABLK_PHYS) {
80 atomic64_add(fma_blk->gnm_blk_size, &device->gnd_nbytes_map);
83 atomic_inc(&device->gnd_n_mdd);
84 /* nfmablk is live (mapped) blocks */
85 atomic_inc(&device->gnd_nfmablk);
91 kgnilnd_alloc_fmablk(kgn_device_t *device, int use_phys)
95 kgn_fma_memblock_t *fma_blk;
96 gni_smsg_attr_t smsg_attr;
97 unsigned long fmablk_vers;
99 #if defined(CONFIG_CRAY_XT) && !defined(CONFIG_CRAY_COMPUTE)
100 /* We allocate large blocks of memory here potentially leading
101 * to memory exhaustion during massive reconnects during a network
102 * outage. Limit the amount of fma blocks to use by always keeping
103 * a percent of pages free initially set to 25% of total memory. */
104 if (global_page_state(NR_FREE_PAGES) < kgnilnd_data.free_pages_limit) {
105 LCONSOLE_INFO("Exceeding free page limit of %ld. "
106 "Free pages available %ld\n",
107 kgnilnd_data.free_pages_limit,
108 global_page_state(NR_FREE_PAGES));
112 /* we'll use fmablk_vers and the gnd_fmablk_mutex to gate access
113 * to this allocation code. Everyone will sample the version
114 * before and after getting the mutex. If it has changed,
115 * we'll bail out to check the lists again - this indicates that
116 * some sort of change was made to the lists and it is possible
117 * that there is a mailbox for us to find now. This should prevent
118 * a ton of spinning in the case where there are lots of threads
119 * that need a yet-to-be-allocated mailbox for a connection. */
121 fmablk_vers = atomic_read(&device->gnd_fmablk_vers);
122 mutex_lock(&device->gnd_fmablk_mutex);
124 if (fmablk_vers != atomic_read(&device->gnd_fmablk_vers)) {
125 /* version changed while we were waiting for semaphore,
126 * we'll recheck the lists assuming something nice happened */
127 mutex_unlock(&device->gnd_fmablk_mutex);
131 LIBCFS_ALLOC(fma_blk, sizeof(kgn_fma_memblock_t));
132 if (fma_blk == NULL) {
133 CNETERR("could not allocate fma block descriptor\n");
138 INIT_LIST_HEAD(&fma_blk->gnm_bufflist);
140 kgnilnd_setup_smsg_attr(&smsg_attr);
142 gni_smsg_buff_size_needed(&smsg_attr, &fma_blk->gnm_mbox_size);
144 LASSERTF(fma_blk->gnm_mbox_size, "mbox size %d\n", fma_blk->gnm_mbox_size);
146 /* gni_smsg_buff_size_needed calculates the base mailbox size and since
147 * we want to hold kgn_peer_credits worth of messages in both directions,
148 * we add PAYLOAD to grow the mailbox size
151 fma_blk->gnm_mbox_size += GNILND_MBOX_PAYLOAD;
153 /* we'll only use physical during preallocate at startup -- this keeps it nice and
154 * clean for runtime decisions. We'll keep the PHYS ones around until shutdown
155 * as reallocating them is tough if there is memory fragmentation */
158 fma_blk->gnm_block = kmem_cache_alloc(kgnilnd_data.kgn_mbox_cache, GFP_ATOMIC);
159 if (fma_blk->gnm_block == NULL) {
160 CNETERR("could not allocate physical SMSG mailbox memory\n");
164 fma_blk->gnm_blk_size = GNILND_MBOX_SIZE;
165 num_mbox = fma_blk->gnm_blk_size / fma_blk->gnm_mbox_size;
167 LASSERTF(num_mbox >= 1,
168 "num_mbox %d blk_size %u mbox_size %d\n",
169 num_mbox, fma_blk->gnm_blk_size, fma_blk->gnm_mbox_size);
171 fma_blk->gnm_state = GNILND_FMABLK_PHYS;
174 num_mbox = *kgnilnd_tunables.kgn_mbox_per_block;
175 fma_blk->gnm_blk_size = num_mbox * fma_blk->gnm_mbox_size;
177 LASSERTF(num_mbox >= 1 && num_mbox >= *kgnilnd_tunables.kgn_mbox_per_block,
178 "num_mbox %d blk_size %u mbox_size %d tunable %d\n",
179 num_mbox, fma_blk->gnm_blk_size, fma_blk->gnm_mbox_size,
180 *kgnilnd_tunables.kgn_mbox_per_block);
182 fma_blk->gnm_block = kgnilnd_vzalloc(fma_blk->gnm_blk_size);
183 if (fma_blk->gnm_block == NULL) {
184 CNETERR("could not allocate virtual SMSG mailbox memory, %d bytes\n", fma_blk->gnm_blk_size);
189 fma_blk->gnm_state = GNILND_FMABLK_VIRT;
192 /* allocate just enough space for the bits to track the mailboxes */
193 CFS_ALLOC_PTR_ARRAY(fma_blk->gnm_bit_array, BITS_TO_LONGS(num_mbox));
194 if (fma_blk->gnm_bit_array == NULL) {
195 CNETERR("could not allocate mailbox bitmask, %lu bytes for %d mbox\n",
196 sizeof(unsigned long) * BITS_TO_LONGS(num_mbox), num_mbox);
200 bitmap_zero(fma_blk->gnm_bit_array, num_mbox);
202 /* now that the num_mbox is set based on allocation type, get debug
205 CFS_ALLOC_PTR_ARRAY(fma_blk->gnm_mbox_info, num_mbox);
206 if (fma_blk->gnm_mbox_info == NULL) {
207 CNETERR("could not allocate mailbox debug, %lu bytes for %d mbox\n",
208 sizeof(kgn_mbox_info_t) * num_mbox, num_mbox);
213 rc = kgnilnd_map_fmablk(device, fma_blk);
218 fma_blk->gnm_next_avail_mbox = 0;
219 fma_blk->gnm_avail_mboxs = fma_blk->gnm_num_mboxs = num_mbox;
221 CDEBUG(D_MALLOC, "alloc fmablk 0x%p num %d msg_maxsize %d credits %d "
222 "mbox_size %d MDD %#llx.%#llx\n",
223 fma_blk, num_mbox, smsg_attr.msg_maxsize, smsg_attr.mbox_maxcredit,
224 fma_blk->gnm_mbox_size, fma_blk->gnm_hndl.qword1,
225 fma_blk->gnm_hndl.qword2);
227 /* lock Is protecting data structures, not semaphore */
229 spin_lock(&device->gnd_fmablk_lock);
230 list_add_tail(&fma_blk->gnm_bufflist, &device->gnd_fma_buffs);
232 /* toggle under the lock so once they change the list is also
233 * ready for others to traverse */
234 atomic_inc(&device->gnd_fmablk_vers);
236 spin_unlock(&device->gnd_fmablk_lock);
238 mutex_unlock(&device->gnd_fmablk_mutex);
243 CFS_FREE_PTR_ARRAY(fma_blk->gnm_mbox_info, num_mbox);
245 CFS_FREE_PTR_ARRAY(fma_blk->gnm_bit_array, BITS_TO_LONGS(num_mbox));
247 if (fma_blk->gnm_state == GNILND_FMABLK_VIRT) {
248 kgnilnd_vfree(fma_blk->gnm_block, fma_blk->gnm_blk_size);
250 kmem_cache_free(kgnilnd_data.kgn_mbox_cache, fma_blk->gnm_block);
253 LIBCFS_FREE(fma_blk, sizeof(kgn_fma_memblock_t));
255 mutex_unlock(&device->gnd_fmablk_mutex);
260 kgnilnd_unmap_fmablk(kgn_device_t *dev, kgn_fma_memblock_t *fma_blk)
264 /* if some held, set hold_timeout from conn timeouts used in this block
265 * but not during shutdown, then just nuke and pave
266 * During a stack reset, we need to deregister with a hold timeout
267 * set so we don't use the same mdd after reset is complete */
268 if ((fma_blk->gnm_held_mboxs && !kgnilnd_data.kgn_shutdown) ||
269 kgnilnd_data.kgn_in_reset) {
270 fma_blk->gnm_hold_timeout = GNILND_TIMEOUT2DEADMAN;
273 /* we are changing the state of a block, tickle version to tell
274 * proc code list is stale now */
275 atomic_inc(&dev->gnd_fmablk_vers);
277 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &fma_blk->gnm_hndl, fma_blk->gnm_hold_timeout);
279 CDEBUG(rrc == GNI_RC_SUCCESS ? D_MALLOC : D_CONSOLE|D_NETERROR,
280 "unmap fmablk 0x%p@%s sz %u total %d avail %d held %d mbox_size %d "
282 fma_blk, kgnilnd_fmablk_state2str(fma_blk->gnm_state),
283 fma_blk->gnm_blk_size, fma_blk->gnm_num_mboxs,
284 fma_blk->gnm_avail_mboxs, fma_blk->gnm_held_mboxs,
285 fma_blk->gnm_mbox_size, fma_blk->gnm_hold_timeout);
287 LASSERTF(rrc == GNI_RC_SUCCESS,
288 "tried to double unmap or something bad, fma_blk %p (rrc %d)\n",
291 if (fma_blk->gnm_hold_timeout &&
292 !(kgnilnd_data.kgn_in_reset &&
293 fma_blk->gnm_state == GNILND_FMABLK_PHYS)) {
294 atomic_inc(&dev->gnd_n_mdd_held);
296 atomic_dec(&dev->gnd_n_mdd);
299 /* PHYS blocks don't get mapped */
300 if (fma_blk->gnm_state != GNILND_FMABLK_PHYS) {
301 atomic64_sub(fma_blk->gnm_blk_size, &dev->gnd_nbytes_map);
302 fma_blk->gnm_state = GNILND_FMABLK_IDLE;
303 } else if (kgnilnd_data.kgn_in_reset) {
304 /* in stack reset, clear MDD handle for PHYS blocks, as we'll
305 * re-use the fma_blk after reset so we don't have to drop/allocate
306 * all of those physical blocks */
307 fma_blk->gnm_hndl.qword1 = fma_blk->gnm_hndl.qword2 = 0UL;
310 /* Decrement here as this is the # of mapped blocks */
311 atomic_dec(&dev->gnd_nfmablk);
315 /* needs lock on gnd_fmablk_lock to cover gnd_fma_buffs */
317 kgnilnd_free_fmablk_locked(kgn_device_t *dev, kgn_fma_memblock_t *fma_blk)
319 LASSERTF(fma_blk->gnm_avail_mboxs == fma_blk->gnm_num_mboxs,
320 "fma_blk %p@%d free in bad state (%d): blk total %d avail %d held %d\n",
321 fma_blk, fma_blk->gnm_state, fma_blk->gnm_hold_timeout, fma_blk->gnm_num_mboxs,
322 fma_blk->gnm_avail_mboxs, fma_blk->gnm_held_mboxs);
324 atomic_inc(&dev->gnd_fmablk_vers);
326 if (fma_blk->gnm_hold_timeout) {
327 CDEBUG(D_MALLOC, "mdd release fmablk 0x%p sz %u avail %d held %d "
329 fma_blk, fma_blk->gnm_blk_size, fma_blk->gnm_avail_mboxs,
330 fma_blk->gnm_held_mboxs, fma_blk->gnm_mbox_size);
332 /* We leave MDD dangling over stack reset */
333 if (!kgnilnd_data.kgn_in_reset) {
334 kgnilnd_mem_mdd_release(dev->gnd_handle, &fma_blk->gnm_hndl);
336 /* ignoring the return code - if kgni/ghal can't find it
337 * it must be released already */
338 atomic_dec(&dev->gnd_n_mdd_held);
339 atomic_dec(&dev->gnd_n_mdd);
342 /* we cant' free the gnm_block until all the conns have released their
343 * purgatory holds. While we have purgatory holds, we might check the conn
344 * RX mailbox during the CLOSING process. It is possible that kgni might
345 * try to look into the RX side for credits when sending the CLOSE msg too */
346 CDEBUG(D_MALLOC, "fmablk %p free buffer %p mbox_size %d\n",
347 fma_blk, fma_blk->gnm_block, fma_blk->gnm_mbox_size);
349 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS) {
350 kmem_cache_free(kgnilnd_data.kgn_mbox_cache, fma_blk->gnm_block);
352 kgnilnd_vfree(fma_blk->gnm_block, fma_blk->gnm_blk_size);
354 fma_blk->gnm_state = GNILND_FMABLK_FREED;
356 list_del(&fma_blk->gnm_bufflist);
358 CFS_FREE_PTR_ARRAY(fma_blk->gnm_mbox_info, fma_blk->gnm_num_mboxs);
359 CFS_FREE_PTR_ARRAY(fma_blk->gnm_bit_array,
360 BITS_TO_LONGS(fma_blk->gnm_num_mboxs));
361 LIBCFS_FREE(fma_blk, sizeof(kgn_fma_memblock_t));
365 kgnilnd_find_free_mbox(kgn_conn_t *conn)
367 kgn_device_t *dev = conn->gnc_device;
368 gni_smsg_attr_t *smsg_attr = &conn->gnpr_smsg_attr;
369 kgn_fma_memblock_t *fma_blk;
370 kgn_mbox_info_t *mbox = NULL;
373 spin_lock(&dev->gnd_fmablk_lock);
375 list_for_each_entry(fma_blk, &conn->gnc_device->gnd_fma_buffs,
377 if (fma_blk->gnm_avail_mboxs <= 0 ||
378 fma_blk->gnm_state <= GNILND_FMABLK_IDLE) {
381 /* look in bitarray for available mailbox */
383 id = find_next_zero_bit(
384 fma_blk->gnm_bit_array,
385 fma_blk->gnm_num_mboxs,
386 fma_blk->gnm_next_avail_mbox);
387 if (id == fma_blk->gnm_num_mboxs &&
388 fma_blk->gnm_next_avail_mbox != 0) {
390 fma_blk->gnm_next_avail_mbox = 0;
396 LASSERTF(id < fma_blk->gnm_num_mboxs, "id %d max %d\n",
397 id, fma_blk->gnm_num_mboxs);
398 set_bit(id, (volatile unsigned long *)fma_blk->gnm_bit_array);
399 conn->gnc_mbox_id = id;
401 fma_blk->gnm_next_avail_mbox =
402 (id == (fma_blk->gnm_num_mboxs - 1)) ? 0 : (id + 1);
403 fma_blk->gnm_avail_mboxs--;
404 conn->gnc_fma_blk = fma_blk;
406 kgnilnd_setup_smsg_attr(smsg_attr);
408 smsg_attr->msg_buffer = fma_blk->gnm_block;
409 smsg_attr->mbox_offset = fma_blk->gnm_mbox_size * id;
410 smsg_attr->mem_hndl = fma_blk->gnm_hndl;
411 smsg_attr->buff_size = fma_blk->gnm_mbox_size;
413 /* We'll set the hndl to zero for PHYS blocks unmapped during stack
414 * reset and re-use the same fma_blk after stack reset. This ensures we've
415 * properly mapped it before we use it */
416 LASSERTF(fma_blk->gnm_hndl.qword1 != 0UL, "unmapped fma_blk %p, state %d\n",
417 fma_blk, fma_blk->gnm_state);
419 CDEBUG(D_NET, "conn %p smsg %p fmablk %p "
420 "allocating SMSG mbox %d buf %p "
421 "offset %u hndl %#llx.%#llx\n",
422 conn, smsg_attr, fma_blk, id,
423 smsg_attr->msg_buffer, smsg_attr->mbox_offset,
424 fma_blk->gnm_hndl.qword1,
425 fma_blk->gnm_hndl.qword2);
427 mbox = &fma_blk->gnm_mbox_info[id];
428 mbox->mbx_create_conn_memset = jiffies;
430 mbox->mbx_nallocs_total++;
432 /* zero mbox to remove any old data from our last use.
433 * this better be safe, if not our purgatory timers
434 * are too short or a peer really is misbehaving */
435 memset(smsg_attr->msg_buffer + smsg_attr->mbox_offset,
436 0, smsg_attr->buff_size);
440 spin_unlock(&dev->gnd_fmablk_lock);
444 kgnilnd_setup_mbox(kgn_conn_t *conn)
446 gni_smsg_attr_t *smsg_attr = &conn->gnpr_smsg_attr;
449 smsg_attr->msg_buffer = NULL;
450 /* Look for available mbox */
452 kgnilnd_find_free_mbox(conn);
454 /* nothing in the existing buffers, make a new one */
455 if (smsg_attr->msg_buffer == NULL) {
456 /* for runtime allocations, we only want vmalloc */
457 err = kgnilnd_alloc_fmablk(conn->gnc_device, 0);
462 } while (smsg_attr->msg_buffer == NULL);
465 CNETERR("couldn't allocate SMSG mbox for conn %p Error: %d\n",
471 kgnilnd_release_mbox(kgn_conn_t *conn, int purgatory_hold)
473 kgn_device_t *dev = conn->gnc_device;
474 gni_smsg_attr_t *smsg_attr = &conn->gnpr_smsg_attr;
475 kgn_fma_memblock_t *fma_blk = NULL;
476 kgn_mbox_info_t *mbox = NULL;
480 /* if we failed to setup mbox and now destroying conn */
481 if (smsg_attr->msg_buffer == NULL) {
485 id = conn->gnc_mbox_id;
487 spin_lock(&dev->gnd_fmablk_lock);
488 /* make sure our conn points at a valid fma_blk
489 * We use this instead of a mem block search out of smsg_attr
490 * because we could have freed a block for fma_blk #1 but the fma_blk
491 * is still in the list for a purgatory hold. This would induce a false
492 * match if that same block gets reallocated to fma_blk #2 */
493 list_for_each_entry(fma_blk, &dev->gnd_fma_buffs, gnm_bufflist) {
494 if (fma_blk == conn->gnc_fma_blk) {
499 LASSERTF(found, "unable to find conn 0x%p with gnc_fma_blk %p "
500 "anywhere in the world\n", conn, conn->gnc_fma_blk);
502 LASSERTF(id < fma_blk->gnm_num_mboxs,
503 "bad id %d max %d\n",
504 id, fma_blk->gnm_num_mboxs);
506 /* < 0 - was held, now free it
507 * == 0 - just free it
508 * > 0 - hold it for now */
509 if (purgatory_hold == 0) {
510 CDEBUG(D_NET, "conn %p smsg %p fmablk %p freeing SMSG mbox %d "
511 "hndl %#llx.%#llx\n",
512 conn, smsg_attr, fma_blk, id,
513 fma_blk->gnm_hndl.qword1, fma_blk->gnm_hndl.qword2);
514 fma_blk->gnm_avail_mboxs++;
516 } else if (purgatory_hold > 0) {
517 CDEBUG(D_NET, "conn %p smsg %p fmablk %p holding SMSG mbox %d "
518 "hndl %#llx.%#llx\n",
519 conn, smsg_attr, fma_blk, id,
520 fma_blk->gnm_hndl.qword1, fma_blk->gnm_hndl.qword2);
522 fma_blk->gnm_held_mboxs++;
523 fma_blk->gnm_max_timeout = max_t(long, fma_blk->gnm_max_timeout,
526 CDEBUG(D_NET, "conn %p smsg %p fmablk %p release SMSG mbox %d "
527 "hndl %#llx.%#llx\n",
528 conn, smsg_attr, fma_blk, id,
529 fma_blk->gnm_hndl.qword1, fma_blk->gnm_hndl.qword2);
531 fma_blk->gnm_held_mboxs--;
532 fma_blk->gnm_avail_mboxs++;
535 if (purgatory_hold <= 0) {
536 /* if kgni is retransmitting, freeing the smsg block before the EP
537 * is destroyed gets messy. Bug 768295. */
538 LASSERTF(conn->gnc_ephandle == NULL,
539 "can't release mbox before EP is nuked. conn 0x%p\n", conn);
541 mbox = &fma_blk->gnm_mbox_info[id];
542 mbox->mbx_release_from_purgatory = jiffies;
544 /* clear conn gnc_fmablk if it is gone - this allows us to
545 * not worry about state so much in kgnilnd_destroy_conn
546 * and makes the guaranteed cleanup of the resources easier */
547 LASSERTF(test_and_clear_bit(id, fma_blk->gnm_bit_array),
548 "conn %p bit %d already cleared in fma_blk %p\n",
550 conn->gnc_fma_blk = NULL;
554 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_FMABLK_AVAIL)) {
555 CERROR("LBUGs in your future: forcibly marking fma_blk %p "
556 "as mapped\n", fma_blk);
557 fma_blk->gnm_state = GNILND_FMABLK_VIRT;
560 /* we don't release or unmap PHYS blocks as part of the normal cycle --
561 * those are controlled manually from startup/shutdown */
562 if (fma_blk->gnm_state != GNILND_FMABLK_PHYS) {
563 /* we can unmap once all are unused (held or avail)
564 * but check hold_timeout to make sure we are not trying to double
565 * unmap this buffer. If there was no hold_timeout set due to
566 * held_mboxs, we'll free the mobx here shortly and won't have to
567 * worry about catching a double free for a 'clean' fma_blk */
568 if (((fma_blk->gnm_avail_mboxs + fma_blk->gnm_held_mboxs) == fma_blk->gnm_num_mboxs) &&
569 (!fma_blk->gnm_hold_timeout)) {
570 kgnilnd_unmap_fmablk(dev, fma_blk);
573 /* But we can only free once they are all avail */
574 if (fma_blk->gnm_avail_mboxs == fma_blk->gnm_num_mboxs &&
575 fma_blk->gnm_held_mboxs == 0) {
576 /* all mailboxes are released, free fma_blk */
577 kgnilnd_free_fmablk_locked(dev, fma_blk);
581 spin_unlock(&dev->gnd_fmablk_lock);
585 kgnilnd_count_phys_mbox(kgn_device_t *device)
588 kgn_fma_memblock_t *fma_blk;
590 spin_lock(&device->gnd_fmablk_lock);
592 list_for_each_entry(fma_blk, &device->gnd_fma_buffs, gnm_bufflist) {
593 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS)
594 i += fma_blk->gnm_num_mboxs;
596 spin_unlock(&device->gnd_fmablk_lock);
602 kgnilnd_allocate_phys_fmablk(kgn_device_t *device)
606 while (kgnilnd_count_phys_mbox(device) < *kgnilnd_tunables.kgn_nphys_mbox) {
608 rc = kgnilnd_alloc_fmablk(device, 1);
610 CERROR("failed phys mbox allocation, stopping at %d, rc %d\n",
611 kgnilnd_count_phys_mbox(device), rc);
619 kgnilnd_map_phys_fmablk(kgn_device_t *device)
623 kgn_fma_memblock_t *fma_blk;
625 /* use mutex to gate access to single thread, just in case */
626 mutex_lock(&device->gnd_fmablk_mutex);
628 spin_lock(&device->gnd_fmablk_lock);
630 list_for_each_entry(fma_blk, &device->gnd_fma_buffs, gnm_bufflist) {
631 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS) {
632 rc = kgnilnd_map_fmablk(device, fma_blk);
637 spin_unlock(&device->gnd_fmablk_lock);
639 mutex_unlock(&device->gnd_fmablk_mutex);
645 kgnilnd_unmap_fma_blocks(kgn_device_t *device)
648 kgn_fma_memblock_t *fma_blk;
650 /* use mutex to gate access to single thread, just in case */
651 mutex_lock(&device->gnd_fmablk_mutex);
653 spin_lock(&device->gnd_fmablk_lock);
655 list_for_each_entry(fma_blk, &device->gnd_fma_buffs, gnm_bufflist) {
656 kgnilnd_unmap_fmablk(device, fma_blk);
658 spin_unlock(&device->gnd_fmablk_lock);
660 mutex_unlock(&device->gnd_fmablk_mutex);
664 kgnilnd_free_phys_fmablk(kgn_device_t *device)
667 kgn_fma_memblock_t *fma_blk, *fma_blkN;
669 /* use mutex to gate access to single thread, just in case */
670 mutex_lock(&device->gnd_fmablk_mutex);
672 spin_lock(&device->gnd_fmablk_lock);
674 list_for_each_entry_safe(fma_blk, fma_blkN, &device->gnd_fma_buffs, gnm_bufflist) {
675 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS)
676 kgnilnd_free_fmablk_locked(device, fma_blk);
678 spin_unlock(&device->gnd_fmablk_lock);
680 mutex_unlock(&device->gnd_fmablk_mutex);
683 /* kgnilnd dgram nid->struct managment */
685 static inline struct list_head *
686 kgnilnd_nid2dgramlist(kgn_device_t *dev, lnet_nid_t nid)
688 unsigned int hash = ((unsigned int)nid) % *kgnilnd_tunables.kgn_peer_hash_size;
690 RETURN(&dev->gnd_dgrams[hash]);
694 /* needs dev->gnd_dgram_lock held */
696 kgnilnd_find_dgram_locked(kgn_device_t *dev, lnet_nid_t dst_nid)
698 struct list_head *dgram_list = kgnilnd_nid2dgramlist(dev, dst_nid);
701 list_for_each_entry(dgram, dgram_list, gndg_list) {
703 /* if state > POSTED, we are already handling cancel/completion */
704 if ((dgram->gndg_conn_out.gncr_dstnid != dst_nid) ||
705 dgram->gndg_state > GNILND_DGRAM_POSTED)
708 CDEBUG(D_NET, "got dgram [%p] -> %s\n",
709 dgram, libcfs_nid2str(dst_nid));
716 kgnilnd_find_and_cancel_dgram(kgn_device_t *dev, lnet_nid_t dst_nid)
720 spin_lock(&dev->gnd_dgram_lock);
721 dgram = kgnilnd_find_dgram_locked(dev, dst_nid);
724 kgnilnd_cancel_dgram_locked(dgram);
726 spin_unlock(&dev->gnd_dgram_lock);
728 RETURN(!!(dgram == NULL));
732 kgnilnd_pack_connreq(kgn_connreq_t *connreq, kgn_conn_t *conn,
733 lnet_nid_t srcnid, lnet_nid_t dstnid,
734 kgn_connreq_type_t type)
738 /* ensure we haven't violated max datagram size */
739 BUILD_BUG_ON(sizeof(kgn_connreq_t) > GNI_DATAGRAM_MAXSIZE);
741 /* no need to zero out, we do that when allocating dgram */
742 connreq->gncr_magic = GNILND_MSG_MAGIC;
744 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PACK_SRCNID)) {
746 } else if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PACK_DSTNID)) {
750 connreq->gncr_srcnid = srcnid;
751 connreq->gncr_dstnid = dstnid;
753 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
754 connreq->gncr_version = 99;
756 connreq->gncr_version = GNILND_CONNREQ_VERSION;
758 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
759 connreq->gncr_type = 99;
761 connreq->gncr_type = type;
763 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
764 connreq->gncr_peerstamp = 0;
766 connreq->gncr_peerstamp = kgnilnd_data.kgn_peerstamp;
768 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
769 connreq->gncr_connstamp = 0;
771 connreq->gncr_connstamp = conn->gnc_my_connstamp;
773 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
774 connreq->gncr_timeout = 0;
776 connreq->gncr_timeout = conn->gnc_timeout;
779 /* the rest pack the data into the payload in other places */
780 if (type == GNILND_CONNREQ_REQ) {
781 kgn_gniparams_t *req_params = &connreq->gncr_gnparams;
782 req_params->gnpr_host_id = conn->gnc_device->gnd_host_id;
783 req_params->gnpr_cqid = conn->gnc_cqid;
785 /* allocate mailbox for this connection */
786 err = kgnilnd_setup_mbox(conn);
788 CERROR("Failed to setup FMA mailbox (%d)\n", err);
790 req_params->gnpr_smsg_attr = conn->gnpr_smsg_attr;
793 /* XXX Nic: TBD - checksum computation */
799 kgnilnd_unpack_connreq(kgn_dgram_t *dgram)
801 kgn_connreq_t *connreq = &dgram->gndg_conn_in;
805 /* the following fields must be handled in a backwards compatible
806 * manner to ensure we can always send and interpret NAKs */
808 if (connreq->gncr_magic != GNILND_MSG_MAGIC &&
809 connreq->gncr_magic != __swab32(GNILND_MSG_MAGIC)) {
810 /* Unexpected magic! */
811 CERROR("Unexpected magic %08x\n",
812 connreq->gncr_magic);
816 swab = (connreq->gncr_magic == __swab32(GNILND_MSG_MAGIC));
818 __swab32s(&connreq->gncr_magic);
819 __swab32s(&connreq->gncr_cksum);
820 __swab16s(&connreq->gncr_type);
821 __swab16s(&connreq->gncr_version);
822 __swab32s(&connreq->gncr_timeout);
823 __swab64s(&connreq->gncr_srcnid);
824 __swab64s(&connreq->gncr_dstnid);
825 __swab64s(&connreq->gncr_peerstamp);
826 __swab64s(&connreq->gncr_connstamp);
829 /* Do NOT return anything but -EBADF before we munge
830 * connreq->gncr_srcnid - we need that to send the nak */
832 if (dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
833 lnet_nid_t incoming = connreq->gncr_srcnid;
835 /* even if the incoming packet is hosed, we know who we sent
836 * the original and can set the srcnid so that we can properly
837 * look up our peer to close the loop on this connreq. We still use
838 * -EBADF to prevent a NAK - just in case there are issues with
839 * the payload coming from a random spot, etc. */
840 connreq->gncr_srcnid = dgram->gndg_conn_out.gncr_dstnid;
842 if (LNET_NIDADDR(dgram->gndg_conn_out.gncr_dstnid) !=
843 LNET_NIDADDR(incoming)) {
844 /* we got a datagram match for the wrong nid... */
845 CERROR("matched datagram 0x%p with srcnid %s "
846 "(%x), expecting %s (%x)\n",
848 libcfs_nid2str(incoming),
849 LNET_NIDADDR(incoming),
850 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
851 LNET_NIDADDR(dgram->gndg_conn_out.gncr_dstnid));
855 /* if we have a wildcard datagram it should match an
856 * incoming "active" datagram that should have a fully formed
857 * srcnid and dstnid. If we couldn't unpack it, we drop as
858 * corrupted packet, otherwise we'll just verify that the dstnid
859 * matches the NID for the NET that the dgram was posted */
861 /* make sure their wildcard didn't match ours, that is unpossible */
862 LASSERTF(connreq->gncr_dstnid != LNET_NID_ANY,
863 "dgram 0x%p from %s, connreq 0x%p; "
864 "wildcard matched wildcard \n", dgram,
865 libcfs_nid2str(connreq->gncr_srcnid), connreq);
867 rc = kgnilnd_find_net(connreq->gncr_dstnid, &net);
869 if (rc == -ESHUTDOWN) {
870 CERROR("Looking up network: device is in shutdown");
872 } else if (rc == -ENONET) {
873 CERROR("Connection data from %s: she sent "
874 "dst_nid %s, but net lookup failed on "
876 libcfs_nid2str(connreq->gncr_srcnid),
877 libcfs_nid2str(connreq->gncr_dstnid),
878 dgram, kgnilnd_dgram_type2str(dgram));
882 if (net->gnn_ni->ni_nid != connreq->gncr_dstnid) {
883 CERROR("Bad connection data from %s: she sent "
884 "dst_nid %s, but I am %s with dgram 0x%p@%s\n",
885 libcfs_nid2str(connreq->gncr_srcnid),
886 libcfs_nid2str(connreq->gncr_dstnid),
887 libcfs_nid2str(net->gnn_ni->ni_nid),
888 dgram, kgnilnd_dgram_type2str(dgram));
889 kgnilnd_net_decref(net);
893 /* kgnilnd_find_net takes a ref on the net it finds, You need to decref it when not needed. */
894 kgnilnd_net_decref(net);
897 if (connreq->gncr_version != GNILND_CONNREQ_VERSION) {
898 CERROR("Unexpected version %d\n", connreq->gncr_version);
902 /* XXX Nic: TBD - checksum validation */
903 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_DROP)) {
907 if (swab && connreq->gncr_type == GNILND_CONNREQ_REQ) {
908 __u64 msg_addr = (__u64) connreq->gncr_gnparams.gnpr_smsg_attr.msg_buffer;
910 __swab32s(&connreq->gncr_gnparams.gnpr_host_id);
911 __swab32s(&connreq->gncr_gnparams.gnpr_cqid);
912 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.buff_size);
913 __swab16s(&connreq->gncr_gnparams.gnpr_smsg_attr.mbox_maxcredit);
914 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.mbox_offset);
915 __swab64s(&connreq->gncr_gnparams.gnpr_smsg_attr.mem_hndl.qword1);
916 __swab64s(&connreq->gncr_gnparams.gnpr_smsg_attr.mem_hndl.qword2);
917 __swab64s(&msg_addr);
918 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.msg_maxsize);
919 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.msg_type);
920 } else if (swab && connreq->gncr_type == GNILND_CONNREQ_NAK) {
921 __swab32s(&connreq->gncr_nakdata.gnnd_errno);
924 /* since we use a unique instance ID for each network, the driver
925 * will take care of dropping datagrams if we don't have that network.
928 /* few more idiot software or configuration checks */
930 switch (connreq->gncr_type) {
931 case GNILND_CONNREQ_REQ:
932 /* wire up EP and SMSG block - this will check the incoming data
933 * and barf a NAK back if need to */
934 rc = kgnilnd_set_conn_params(dgram);
938 case GNILND_CONNREQ_NAK:
939 case GNILND_CONNREQ_CLOSE:
942 CERROR("unknown connreq packet type %d\n", connreq->gncr_type);
946 if (connreq->gncr_peerstamp == 0 || connreq->gncr_connstamp == 0) {
947 CERROR("Recived bad timestamps peer %llu conn %llu\n",
948 connreq->gncr_peerstamp, connreq->gncr_connstamp);
952 if (connreq->gncr_timeout < GNILND_MIN_TIMEOUT) {
953 CERROR("Received timeout %d < MIN %d\n",
954 connreq->gncr_timeout, GNILND_MIN_TIMEOUT);
962 kgnilnd_alloc_dgram(kgn_dgram_t **dgramp, kgn_device_t *dev, kgn_dgram_type_t type)
966 dgram = kmem_cache_alloc(kgnilnd_data.kgn_dgram_cache, GFP_ATOMIC);
970 /* cache alloc'd memory is not zeroed */
971 memset((void *)dgram, 0, sizeof(*dgram)) ;
973 INIT_LIST_HEAD(&dgram->gndg_list);
974 dgram->gndg_state = GNILND_DGRAM_USED;
975 dgram->gndg_type = type;
976 dgram->gndg_magic = GNILND_DGRAM_MAGIC;
978 atomic_inc(&dev->gnd_ndgrams);
980 CDEBUG(D_MALLOC|D_NETTRACE, "slab-alloced 'dgram': %lu at %p %s ndgrams"
982 sizeof(*dgram), dgram, kgnilnd_dgram_type2str(dgram),
983 atomic_read(&dev->gnd_ndgrams));
989 /* call this on a dgram that came back from kgnilnd_ep_postdata_test_by_id
990 * returns < 0 on dgram to be cleaned up
991 * > 0 on dgram that isn't done yet
992 * == 0 on dgram that is ok and needs connreq processing */
994 kgnilnd_process_dgram(kgn_dgram_t *dgram, gni_post_state_t post_state)
998 switch (post_state) {
999 case GNI_POST_COMPLETED:
1000 /* normal state for dgrams that need actual processing */
1001 /* GOTO to avoid processing dgram as canceled/done */
1002 GOTO(process_out, rc);
1004 case GNI_POST_PENDING:
1005 /* we should only see this if we are testing a WC dgram after a
1006 * cancel - it means that it needs a full cycle of waiting
1007 * for kgni_sm_task to finish moving it to TERMINATED */
1008 LASSERTF((dgram->gndg_type == GNILND_DGRAM_WC_REQ) &&
1009 (dgram->gndg_state == GNILND_DGRAM_CANCELED),
1010 "POST_PENDING dgram 0x%p with bad type %d(%s) or state %d(%s)\n",
1011 dgram, dgram->gndg_type, kgnilnd_dgram_type2str(dgram),
1012 dgram->gndg_state, kgnilnd_dgram_state2str(dgram));
1014 /* positive RC as this dgram isn't done yet */
1017 /* GOTO as this isn't done yet */
1018 GOTO(process_out, rc);
1021 case GNI_POST_TERMINATED:
1022 /* we've called cancel and it is done or remote guy called cancel and
1023 * we've receved it on a WC dgram */
1025 /* we are seeing weird terminations on non WC dgrams when we have not
1028 LASSERTF(dgram->gndg_state == GNILND_DGRAM_CANCELED ||
1029 dgram->gndg_conn_out.gncr_dstnid == LNET_NID_ANY,
1030 "dgram 0x%p with bad state %d(%s) or dst nid %s\n",
1031 dgram, dgram->gndg_state, kgnilnd_dgram_state2str(dgram),
1032 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid));
1035 CDEBUG(D_NETTRACE, "dgram 0x%p saw %s, cleaning it up\n", dgram,
1036 dgram->gndg_state == GNILND_DGRAM_CANCELED ? "canceled" : "terminated");
1041 case GNI_POST_TIMEOUT:
1042 /* we could have a timeout on a wildcard dgram too - if
1043 * we got the incoming request but the remote node beefed
1044 * before kgni could send the match data back. We'll just error
1045 * on the active case and bail out gracefully */
1046 if (dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
1047 CNETERR("hardware timeout for connect to "
1048 "%s after %lu seconds. Is node dead?\n",
1049 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
1050 cfs_duration_sec(jiffies - dgram->gndg_post_time));
1057 CERROR("dgram 0x%p with bad post_state %d\n", dgram, post_state);
1061 /* now finish cleaning up a dgram that is canceled/terminated and needs to
1064 /* If this was actively canceled, drop the count now that we are processing */
1065 if (dgram->gndg_state == GNILND_DGRAM_CANCELED) {
1066 atomic_dec(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1067 /* caller responsible for gndg_list removal */
1075 /* needs dev->gnd_dgram_lock held */
1077 kgnilnd_cancel_dgram_locked(kgn_dgram_t *dgram)
1081 if (dgram->gndg_state != GNILND_DGRAM_POSTED) {
1085 LASSERTF(dgram->gndg_conn != NULL,
1086 "dgram 0x%p with NULL conn\n", dgram);
1088 /* C.E - WC dgrams could be canceled immediately but
1089 * if there was some match pending, we need to call
1090 * test_by_id to clear it out. If that test returns
1091 * POST_PENDING, it is half done and needs to go along
1092 * with the rest of dgrams and go through a kgni_sm_task cycle
1093 * and deliver a GNI_POST_TERMINATED event before they
1094 * are actually canceled */
1096 dgram->gndg_state = GNILND_DGRAM_CANCELED;
1098 if (dgram->gndg_conn->gnc_state >= GNILND_CONN_ESTABLISHED) {
1099 /* we don't need to cancel_by_id if the datagram was good */
1103 /* let folks know there are outstanding cancels */
1104 atomic_inc(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1105 /* leave on nid list until cancel is done for debugging fun */
1106 grc = kgnilnd_ep_postdata_cancel_by_id(dgram->gndg_conn->gnc_ephandle, (__u64) dgram);
1108 /* if we don't get success here, we have hosed up the dgram tracking
1109 * code and need to bail out */
1110 LASSERTF(grc == GNI_RC_SUCCESS,
1111 "postdata_cancel returned %d for conn 0x%p to %s\n",
1112 grc, dgram->gndg_conn,
1113 dgram->gndg_conn->gnc_peer ?
1114 libcfs_nid2str(dgram->gndg_conn->gnc_peer->gnp_nid)
1118 "canceled dgram 0x%p conn 0x%p ephandle 0x%p\n",
1119 dgram, dgram->gndg_conn,
1120 dgram->gndg_conn->gnc_ephandle);
1122 if (dgram->gndg_type == GNILND_DGRAM_WC_REQ) {
1123 gni_post_state_t post_state;
1125 __u32 remote_addr = 0, remote_id = 0;
1127 grc = kgnilnd_ep_postdata_test_by_id(dgram->gndg_conn->gnc_ephandle,
1128 (__u64)dgram, &post_state,
1129 &remote_addr, &remote_id);
1131 LASSERTF(grc == GNI_RC_NO_MATCH || grc == GNI_RC_SUCCESS,
1132 "bad grc %d from test_by_id on dgram 0x%p\n",
1135 /* if WC was canceled immediately, we get NO_MATCH, if needs to go
1136 * through full cycle, we get SUCCESS and need to parse post_state */
1138 CDEBUG(D_NET, "grc %d dgram 0x%p type %s post_state %d "
1139 "remote_addr %u remote_id %u\n", grc, dgram,
1140 kgnilnd_dgram_type2str(dgram),
1141 post_state, remote_addr, remote_id);
1143 if (grc == GNI_RC_NO_MATCH) {
1144 /* she's gone, reduce count and move along */
1145 dgram->gndg_state = GNILND_DGRAM_DONE;
1146 atomic_dec(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1150 rc = kgnilnd_process_dgram(dgram, post_state);
1153 /* if for some weird reason we get a valid dgram back, just mark as done
1154 * so we can drop it and move along.
1155 * C.E - if it was completed, we'll just release the conn/mbox
1156 * back into the pool and it'll get reused. That said, we should only
1157 * be canceling a WC dgram on stack rest or shutdown, so that is moot */
1158 dgram->gndg_state = GNILND_DGRAM_DONE;
1159 atomic_dec(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1161 /* caller context responsible for calling kgnilnd_release_dgram() */
1163 /* still pending, let it simmer until golden brown and delicious */
1167 /* for non WC dgrams, they are still on the nid list but marked canceled waiting
1168 * for kgni to return their ID to us via probe - that is when we'll complete their
1169 * cancel processing */
1173 kgnilnd_cleanup_dgram(kgn_dgram_t *dgram)
1175 /* release the dgram ref on conn */
1176 if (dgram->gndg_conn) {
1177 kgnilnd_conn_decref(dgram->gndg_conn);
1178 dgram->gndg_conn = NULL;
1183 kgnilnd_free_dgram(kgn_device_t *dev, kgn_dgram_t *dgram)
1185 LASSERTF(dgram->gndg_state == GNILND_DGRAM_USED ||
1186 dgram->gndg_state == GNILND_DGRAM_DONE,
1187 "dgram 0x%p with bad state %s\n",
1188 dgram, kgnilnd_dgram_state2str(dgram));
1190 /* bit of poisoning to help detect bad driver data */
1191 dgram->gndg_magic = 0x6f5a6b5f;
1192 atomic_dec(&dev->gnd_ndgrams);
1194 kmem_cache_free(kgnilnd_data.kgn_dgram_cache, dgram);
1195 CDEBUG(D_MALLOC|D_NETTRACE, "slab-freed 'dgram': %lu at %p %s"
1197 sizeof(*dgram), dgram, kgnilnd_dgram_type2str(dgram),
1198 atomic_read(&dev->gnd_ndgrams));
1202 kgnilnd_post_dgram(kgn_device_t *dev, lnet_nid_t dstnid, kgn_connreq_type_t type,
1206 kgn_dgram_t *dgram = NULL;
1207 kgn_dgram_t *tmpdgram;
1208 kgn_dgram_type_t dgtype;
1214 case GNILND_CONNREQ_REQ:
1215 if (dstnid == LNET_NID_ANY)
1216 dgtype = GNILND_DGRAM_WC_REQ;
1218 dgtype = GNILND_DGRAM_REQ;
1220 case GNILND_CONNREQ_NAK:
1221 LASSERTF(dstnid != LNET_NID_ANY, "can't NAK to LNET_NID_ANY\n");
1222 dgtype = GNILND_DGRAM_NAK;
1225 CERROR("unknown connreq type %d\n", type);
1229 rc = kgnilnd_alloc_dgram(&dgram, dev, dgtype);
1232 GOTO(post_failed, rc);
1235 rc = kgnilnd_create_conn(&dgram->gndg_conn, dev);
1237 GOTO(post_failed, rc);
1240 if (dgram->gndg_type == GNILND_DGRAM_WC_REQ) {
1241 /* clear buffer for sanity on reuse of wildcard */
1242 memset(&dgram->gndg_conn_in, 0, sizeof(kgn_connreq_t));
1245 if (dstnid == LNET_NID_ANY) {
1246 /* set here to reset any dgram re-use */
1247 dgram->gndg_conn->gnc_state = GNILND_CONN_LISTEN;
1251 rc = kgnilnd_nid_to_nicaddrs(LNET_NIDADDR(dstnid), 1, &host_id);
1254 GOTO(post_failed, rc);
1257 dgram->gndg_conn->gnc_state = GNILND_CONN_CONNECTING;
1259 /* don't need to serialize, there are no CQs for the dgram
1260 * EP on the kgn_net_t */
1261 grc = kgnilnd_ep_bind(dgram->gndg_conn->gnc_ephandle, host_id, dev->gnd_id);
1263 if (grc != GNI_RC_SUCCESS) {
1265 GOTO(post_failed, rc);
1270 /* If we are posting wildcards post using a net of 0, otherwise we'll use the
1271 * net of the destination node.
1274 if (dstnid == LNET_NID_ANY) {
1275 srcnid = LNET_MKNID(LNET_MKNET(GNILND, 0), dev->gnd_nid);
1277 srcnid = LNET_MKNID(LNET_NIDNET(dstnid), dev->gnd_nid);
1280 rc = kgnilnd_pack_connreq(&dgram->gndg_conn_out, dgram->gndg_conn,
1281 srcnid, dstnid, type);
1283 GOTO(post_failed, rc);
1286 if (type == GNILND_CONNREQ_NAK)
1287 dgram->gndg_conn_out.gncr_nakdata.gnnd_errno = data_rc;
1289 dgram->gndg_post_time = jiffies;
1291 /* XXX Nic: here is where we'd add in logical network multiplexing */
1293 CDEBUG(D_NETTRACE, "dgram 0x%p type %s %s->%s cdm %d\n",
1294 dgram, kgnilnd_dgram_type2str(dgram),
1295 libcfs_nid2str(srcnid),
1296 libcfs_nid2str(dstnid), dev->gnd_id);
1298 /* this allocates memory, can't hold locks across */
1299 grc = kgnilnd_ep_postdata_w_id(dgram->gndg_conn->gnc_ephandle,
1300 &dgram->gndg_conn_out, sizeof(kgn_connreq_t),
1301 &dgram->gndg_conn_in, sizeof(kgn_connreq_t),
1304 if (grc != GNI_RC_SUCCESS) {
1305 CNETERR("dropping failed dgram post id 0x%p type %s"
1306 " reqtype %s to %s: rc %d\n",
1307 dgram, kgnilnd_dgram_type2str(dgram),
1308 kgnilnd_connreq_type2str(&dgram->gndg_conn_out),
1309 libcfs_nid2str(dstnid), grc);
1310 rc = (grc == GNI_RC_ERROR_NOMEM) ? -ENOMEM : -EBADR;
1311 GOTO(post_failed, rc);
1314 /* we don't need to add earlier - if someone does del_peer during post,
1315 * that peer will get marked as unlinked and the callers wil take care of it.
1316 * The dgram code is largely kgn_peer_t ignorant, so at worst, we'll just drop
1317 * the completed dgram later when we cant find a peer to stuff it into */
1319 spin_lock(&dev->gnd_dgram_lock);
1321 /* make sure we are not double posting targeted dgrams
1322 * - we can multiple post WC dgrams to help with processing speed */
1323 if (dstnid != LNET_NID_ANY) {
1324 tmpdgram = kgnilnd_find_dgram_locked(dev, dstnid);
1326 LASSERTF(tmpdgram == NULL,
1327 "dgram 0x%p->%s already posted\n",
1328 dgram, libcfs_nid2str(dstnid));
1331 /* unmunge dstnid to help processing code cope... */
1332 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PACK_DSTNID)) {
1333 dgram->gndg_conn_out.gncr_dstnid = dstnid;
1336 list_add_tail(&dgram->gndg_list, kgnilnd_nid2dgramlist(dev, dstnid));
1337 dgram->gndg_state = GNILND_DGRAM_POSTED;
1338 spin_unlock(&dev->gnd_dgram_lock);
1341 if (rc < 0 && dgram != NULL) {
1342 kgnilnd_cleanup_dgram(dgram);
1343 kgnilnd_free_dgram(dev, dgram);
1349 /* The shutdown flag is set from the shutdown and stack reset threads. */
1351 kgnilnd_release_dgram(kgn_device_t *dev, kgn_dgram_t *dgram, int shutdown)
1353 /* The conns of canceled active dgrams need to be put in purgatory so
1354 * we don't reuse the mailbox */
1355 if (unlikely(dgram->gndg_state == GNILND_DGRAM_CANCELED)) {
1357 kgn_conn_t *conn = dgram->gndg_conn;
1358 lnet_nid_t nid = dgram->gndg_conn_out.gncr_dstnid;
1360 dgram->gndg_state = GNILND_DGRAM_DONE;
1362 /* During shutdown we've already removed the peer so we don't
1363 * need to add a peer. During stack reset we don't care about
1364 * MDDs since they are all released. */
1366 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1367 peer = kgnilnd_find_peer_locked(nid);
1370 CDEBUG(D_NET, "adding peer's conn with nid %s "
1371 "to purgatory\n", libcfs_nid2str(nid));
1372 kgnilnd_conn_addref(conn);
1373 conn->gnc_peer = peer;
1374 kgnilnd_peer_addref(peer);
1375 kgnilnd_admin_addref(conn->gnc_peer->gnp_dirty_eps);
1376 conn->gnc_state = GNILND_CONN_CLOSED;
1377 list_add_tail(&conn->gnc_list,
1379 kgnilnd_add_purgatory_locked(conn,
1381 kgnilnd_schedule_conn(conn);
1383 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1387 spin_lock(&dev->gnd_dgram_lock);
1388 kgnilnd_cancel_dgram_locked(dgram);
1389 spin_unlock(&dev->gnd_dgram_lock);
1391 kgnilnd_cleanup_dgram(dgram);
1393 /* if the dgram is 'canceled' it needs to be wait until the event
1394 * comes up from kgni that tells us it is safe to release */
1395 if (dgram->gndg_state != GNILND_DGRAM_CANCELED) {
1396 dgram->gndg_state = GNILND_DGRAM_DONE;
1398 LASSERTF(list_empty(&dgram->gndg_list), "dgram 0x%p on list\n", dgram);
1400 /* if it is a wildcard and we are in an appropriate state, repost
1403 if ((dgram->gndg_type == GNILND_DGRAM_WC_REQ) &&
1404 (!kgnilnd_data.kgn_wc_kill && !kgnilnd_data.kgn_in_reset)) {
1407 rerc = kgnilnd_post_dgram(dev, LNET_NID_ANY, GNILND_CONNREQ_REQ, 0);
1409 /* We failed to repost the WC dgram for some reason
1410 * mark it so the repost system attempts to repost */
1411 kgnilnd_admin_addref(dev->gnd_nwcdgrams);
1415 /* always free the old dgram */
1416 kgnilnd_free_dgram(dev, dgram);
1422 kgnilnd_probe_for_dgram(kgn_device_t *dev, kgn_dgram_t **dgramp)
1424 kgn_dgram_t *dgram = NULL;
1425 gni_post_state_t post_state;
1429 __u32 remote_addr = 0, remote_id = 0;
1432 /* Probe with the lock held. That way if we get a dgram we dont have it canceled
1433 * between finding the ready dgram and grabbing the lock to remove it from the
1434 * list. Otherwise we could be left in an inconsistent state. We own the dgram
1435 * once its off the list so we don't need to worry about others changing it at
1437 spin_lock(&dev->gnd_dgram_lock);
1438 grc = kgnilnd_postdata_probe_by_id(dev->gnd_handle, &readyid);
1439 if (grc != GNI_RC_SUCCESS) {
1440 spin_unlock(&dev->gnd_dgram_lock);
1441 /* return 0 to indicate nothing happened */
1445 CDEBUG(D_NET, "ready %#llx on device 0x%p\n",
1448 dgram = (kgn_dgram_t *)readyid;
1450 LASSERTF(dgram->gndg_magic == GNILND_DGRAM_MAGIC,
1451 "dgram 0x%p from id %#llx with bad magic %x\n",
1452 dgram, readyid, dgram->gndg_magic);
1454 LASSERTF(dgram->gndg_state == GNILND_DGRAM_POSTED ||
1455 dgram->gndg_state == GNILND_DGRAM_CANCELED,
1456 "dgram 0x%p with bad state %s\n",
1457 dgram, kgnilnd_dgram_state2str(dgram));
1459 LASSERTF(!list_empty(&dgram->gndg_list),
1460 "dgram 0x%p with bad list state %s type %s\n",
1461 dgram, kgnilnd_dgram_state2str(dgram),
1462 kgnilnd_dgram_type2str(dgram));
1464 /* now we know that the datagram structure is ok, so pull off list */
1465 list_del_init(&dgram->gndg_list);
1467 /* while we have the gnn_dgram_lock and BEFORE we call test_by_id
1468 * change the state from POSTED to PROCESSING to ensure that
1469 * nobody cancels it after we've pulled it from the wire */
1470 if (dgram->gndg_state == GNILND_DGRAM_POSTED) {
1471 dgram->gndg_state = GNILND_DGRAM_PROCESSING;
1474 LASSERTF(dgram->gndg_conn != NULL,
1475 "dgram 0x%p with NULL conn\n", dgram);
1477 grc = kgnilnd_ep_postdata_test_by_id(dgram->gndg_conn->gnc_ephandle,
1478 (__u64)dgram, &post_state,
1479 &remote_addr, &remote_id);
1481 /* we now "own" this datagram */
1482 spin_unlock(&dev->gnd_dgram_lock);
1484 LASSERTF(grc != GNI_RC_NO_MATCH, "kgni lied! probe_by_id told us that"
1485 " id %llu was ready\n", readyid);
1487 CDEBUG(D_NET, "grc %d dgram 0x%p type %s post_state %d "
1488 "remote_addr %u remote_id %u\n", grc, dgram,
1489 kgnilnd_dgram_type2str(dgram),
1490 post_state, remote_addr, remote_id);
1492 if (unlikely(grc != GNI_RC_SUCCESS)) {
1493 CNETERR("getting data for dgram 0x%p->%s failed rc %d. Dropping it\n",
1494 dgram, libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
1497 GOTO(probe_for_out, rc);
1500 rc = kgnilnd_process_dgram(dgram, post_state);
1502 /* we should never get probe finding a dgram for us and then it
1503 * being a WC dgram that is still in the middle of processing */
1504 LASSERTF(rc <= 0, "bad rc %d from process_dgram 0x%p state %d\n",
1505 rc, dgram, post_state);
1508 /* dgram is good enough for the data to be used */
1509 dgram->gndg_state = GNILND_DGRAM_PROCESSING;
1510 /* fake rc to mark that we've done something */
1513 /* let kgnilnd_release_dgram take care of canceled dgrams */
1514 if (dgram->gndg_state != GNILND_DGRAM_CANCELED) {
1515 dgram->gndg_state = GNILND_DGRAM_DONE;
1524 kgnilnd_release_dgram(dev, dgram, 0);
1529 kgnilnd_setup_wildcard_dgram(kgn_device_t *dev)
1531 /* if kgn_wildcard is zero, return error */
1532 int rc = -ENOENT, i;
1535 for (i = 0; i < *kgnilnd_tunables.kgn_nwildcard; i++) {
1536 rc = kgnilnd_post_dgram(dev, LNET_NID_ANY, GNILND_CONNREQ_REQ, 0);
1538 CERROR("error %d: could not post wildcard datagram # %d\n",
1550 kgnilnd_cancel_net_dgrams(kgn_net_t *net)
1552 kgn_dgram_t *dg, *dgN;
1557 /* we want to cancel any outstanding dgrams - we don't want to rely
1558 * on del_peer_or_conn catching all of them. This helps protect us in cases
1559 * where we don't quite keep the peer->dgram mapping in sync due to some
1560 * race conditions */
1562 LASSERTF(net->gnn_shutdown || kgnilnd_data.kgn_in_reset,
1563 "called with LND invalid state: net shutdown %d "
1564 "in reset %d\n", net->gnn_shutdown,
1565 kgnilnd_data.kgn_in_reset);
1567 spin_lock(&net->gnn_dev->gnd_dgram_lock);
1569 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1570 list_for_each_entry_safe(dg, dgN, &net->gnn_dev->gnd_dgrams[i], gndg_list) {
1572 /* skip nids not on our net or are wildcards */
1575 if (dg->gndg_type == GNILND_DGRAM_WC_REQ ||
1576 net->gnn_netnum != LNET_NETNUM(LNET_NIDNET(dg->gndg_conn_out.gncr_dstnid)))
1579 kgnilnd_cancel_dgram_locked(dg);
1583 spin_unlock(&net->gnn_dev->gnd_dgram_lock);
1589 kgnilnd_cancel_wc_dgrams(kgn_device_t *dev)
1591 kgn_dgram_t *dg, *dgN;
1595 /* Time to kill the outstanding WC's
1596 * WC's exist on net 0 only but match on any net...
1599 LASSERTF(kgnilnd_data.kgn_in_reset || kgnilnd_data.kgn_wc_kill,
1600 "called with LND invalid state: WC shutdown %d "
1601 "in reset %d\n", kgnilnd_data.kgn_wc_kill,
1602 kgnilnd_data.kgn_in_reset);
1604 spin_lock(&dev->gnd_dgram_lock);
1607 dg = kgnilnd_find_dgram_locked(dev, LNET_NID_ANY);
1609 LASSERTF(dg->gndg_type == GNILND_DGRAM_WC_REQ,
1610 "dgram 0x%p->%s with bad type %d (%s)\n",
1611 dg, libcfs_nid2str(dg->gndg_conn_out.gncr_dstnid),
1612 dg->gndg_type, kgnilnd_dgram_type2str(dg));
1614 kgnilnd_cancel_dgram_locked(dg);
1616 /* WC could be DONE already, check and if so add to list to be released */
1617 if (dg->gndg_state == GNILND_DGRAM_DONE)
1618 list_move_tail(&dg->gndg_list, &zombies);
1620 } while (dg != NULL);
1622 spin_unlock(&dev->gnd_dgram_lock);
1624 list_for_each_entry_safe(dg, dgN, &zombies, gndg_list) {
1625 list_del_init(&dg->gndg_list);
1626 kgnilnd_release_dgram(dev, dg, 1);
1633 kgnilnd_cancel_dgrams(kgn_device_t *dev)
1635 kgn_dgram_t *dg, *dgN;
1639 /* Cancel any outstanding non wildcard datagrams regardless
1640 * of which net they are on as we are in base shutdown and
1641 * dont care about connecting anymore.
1644 LASSERTF(kgnilnd_data.kgn_wc_kill == 1,"We didnt get called from base shutdown\n");
1646 spin_lock(&dev->gnd_dgram_lock);
1648 for (i = 0; i < (*kgnilnd_tunables.kgn_peer_hash_size -1); i++) {
1649 list_for_each_entry_safe(dg, dgN, &dev->gnd_dgrams[i], gndg_list) {
1650 if (dg->gndg_type != GNILND_DGRAM_WC_REQ)
1651 kgnilnd_cancel_dgram_locked(dg);
1655 spin_unlock(&dev->gnd_dgram_lock);
1662 kgnilnd_wait_for_canceled_dgrams(kgn_device_t *dev)
1670 /* use do while to get at least one check run to allow
1671 * regression test for 762072 to hit bug if there */
1673 /* This function races with the dgram mover during shutdown so it is possible for
1674 * a dgram to be seen in kgnilnd_postdata_probe_wait_by_id but be handled in the
1675 * dgram mover thread instead of inside of this function.
1678 /* This should only be called from within shutdown, baseshutdown, or stack reset.
1679 * there are no assertions here to verify since base_shutdown has nothing in it we can check
1680 * the net is gone by then.
1685 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1686 "Waiting for %d canceled datagrams to clear on device %d\n",
1687 atomic_read(&dev->gnd_canceled_dgrams), dev->gnd_id);
1689 /* check once a second */
1690 grc = kgnilnd_postdata_probe_wait_by_id(dev->gnd_handle,
1693 if (grc != GNI_RC_SUCCESS)
1696 CDEBUG(D_NET, "ready %#llx on device %d->0x%p\n",
1697 readyid, dev->gnd_id, dev);
1699 rc = kgnilnd_probe_for_dgram(dev, &dgram);
1701 /* if we got a valid dgram or one that is now done, clean up */
1702 kgnilnd_release_dgram(dev, dgram, 1);
1704 } while (atomic_read(&dev->gnd_canceled_dgrams));
1708 kgnilnd_start_connect(kgn_peer_t *peer)
1711 /* sync point for kgnilnd_del_peer_locked - do an early check to
1712 * catch the most common hits where del_peer is done by the
1713 * time we get here */
1714 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GNP_CONNECTING1)) {
1715 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_GNP_CONNECTING1, 1)) {};
1718 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1719 if (!kgnilnd_peer_active(peer) || peer->gnp_connecting != GNILND_PEER_CONNECT) {
1720 /* raced with peer getting unlinked */
1721 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1725 peer->gnp_connecting = GNILND_PEER_POSTING;
1726 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1728 set_mb(peer->gnp_last_dgram_time, jiffies);
1729 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GNP_CONNECTING2)) {
1730 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_GNP_CONNECTING2, 1)) {};
1733 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GNP_CONNECTING3)) {
1734 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_GNP_CONNECTING3, 1)) {};
1735 rc = cfs_fail_val ? cfs_fail_val : -ENOMEM;
1737 rc = kgnilnd_post_dgram(peer->gnp_net->gnn_dev,
1738 peer->gnp_nid, GNILND_CONNREQ_REQ, 0);
1741 set_mb(peer->gnp_last_dgram_errno, rc);
1745 /* while we're posting someone could have decided this peer/dgram needed to
1746 * die a quick death, so we check for state change and process accordingly */
1748 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1749 if (!kgnilnd_peer_active(peer) || peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1750 if (peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1751 peer->gnp_connecting = GNILND_PEER_KILL;
1753 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1754 /* positive RC to avoid dgram cleanup - we'll have to
1755 * wait for the kgni GNI_POST_TERMINATED event to
1756 * finish cleaning up */
1758 kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev, peer->gnp_nid);
1761 peer->gnp_connecting = GNILND_PEER_POSTED;
1762 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1763 /* reaper thread will take care of any timeouts */
1764 CDEBUG(D_NET, "waiting for connect to finish to %s rc %d\n",
1765 libcfs_nid2str(peer->gnp_nid), rc);
1770 CDEBUG(D_NET, "connect to %s failed: rc %d \n",
1771 libcfs_nid2str(peer->gnp_nid), rc);
1777 kgnilnd_finish_connect(kgn_dgram_t *dgram)
1779 kgn_conn_t *conn = dgram->gndg_conn;
1780 lnet_nid_t her_nid = dgram->gndg_conn_in.gncr_srcnid;
1781 kgn_peer_t *new_peer, *peer = NULL;
1784 kgn_mbox_info_t *mbox;
1788 /* try to find a peer that matches the nid we got in the connreq
1789 * kgnilnd_unpack_connreq makes sure that conn_in.gncr_srcnid is
1790 * HER and conn_out.gncr_srcnid is ME for both active and WC dgrams */
1792 /* assume this is a new peer - it makes locking cleaner when it isn't */
1793 /* no holding kgn_net_rw_sem - already are at the kgnilnd_dgram_mover level */
1795 rc = kgnilnd_create_peer_safe(&new_peer, her_nid, NULL, GNILND_PEER_UP);
1797 CERROR("Can't create peer for %s\n", libcfs_nid2str(her_nid));
1801 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1803 /* this transfers ref from create_peer to the kgn_peer table */
1804 kgnilnd_add_peer_locked(her_nid, new_peer, &peer);
1806 /* if we found an existing peer, is it really ready for a new conn ? */
1807 if (peer != new_peer) {
1808 /* if this was an active connect attempt but we can't find a peer waiting for it
1809 * we will dump in the trash */
1811 if (peer->gnp_connecting == GNILND_PEER_IDLE && dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
1812 CDEBUG(D_NET, "dropping completed connreq for %s peer 0x%p->%s\n",
1813 libcfs_nid2str(her_nid), peer, libcfs_nid2str(peer->gnp_nid));
1814 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1819 /* check to see if we can catch a connecting peer before it is
1820 * removed from the connd_peers list - if not, we need to
1821 * let the connreqs race and be handled by kgnilnd_conn_isdup_locked() */
1822 if (peer->gnp_connecting != GNILND_PEER_IDLE) {
1823 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1824 if (!list_empty(&peer->gnp_connd_list)) {
1825 list_del_init(&peer->gnp_connd_list);
1826 /* drop connd ref */
1827 kgnilnd_peer_decref(peer);
1829 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1830 /* clear rc to make sure we don't have fake error */
1834 /* no matter what, we are no longer waiting to connect this peer now */
1835 peer->gnp_connecting = GNILND_PEER_IDLE;
1837 /* Refuse to duplicate an existing connection (both sides might try to
1838 * connect at once). NB we return success! We _are_ connected so we
1839 * _don't_ have any blocked txs to complete with failure. */
1840 rc = kgnilnd_conn_isdup_locked(peer, conn);
1842 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1843 CDEBUG(D_NET, "Not creating duplicate connection to %s: %d\n",
1844 libcfs_nid2str(her_nid), rc);
1850 if (peer->gnp_state == GNILND_PEER_DOWN) {
1851 CNETERR("Received connection request from down nid %s\n",
1852 libcfs_nid2str(her_nid));
1855 peer->gnp_state = GNILND_PEER_UP;
1856 nstale = kgnilnd_close_stale_conns_locked(peer, conn);
1858 /* either way with peer (new or existing), we are ok with ref counts here as the
1859 * kgnilnd_add_peer_locked will use our ref on new_peer (from create_peer_safe) as the
1860 * ref for the peer table. */
1862 /* at this point, the connection request is a winner */
1864 /* mark 'DONE' to avoid cancel being called from release */
1865 dgram->gndg_state = GNILND_DGRAM_DONE;
1867 /* initialise timestamps before reaper looks at them */
1868 conn->gnc_last_rx = conn->gnc_last_rx_cq = jiffies;
1870 /* last_tx is initialized to jiffies - (keepalive*2) so that if the NOOP fails it will
1871 * immediatly send a NOOP in the reaper thread during the call to
1872 * kgnilnd_check_conn_timeouts_locked
1874 conn->gnc_last_tx = jiffies - (cfs_time_seconds(GNILND_TO2KA(conn->gnc_timeout)) * 2);
1875 conn->gnc_state = GNILND_CONN_ESTABLISHED;
1877 /* save the dgram type used to establish this connection */
1878 conn->gnc_dgram_type = dgram->gndg_type;
1880 /* refs are not transferred from dgram to tables, so increment to
1882 kgnilnd_conn_addref(conn);
1883 kgnilnd_peer_addref(peer);
1884 conn->gnc_peer = peer;
1885 list_add_tail(&conn->gnc_list, &peer->gnp_conns);
1887 kgnilnd_conn_addref(conn); /* +1 ref for conn table */
1888 list_add_tail(&conn->gnc_hashlist,
1889 kgnilnd_cqid2connlist(conn->gnc_cqid));
1890 kgnilnd_data.kgn_conn_version++;
1892 /* Dont send NOOP if fail_loc is set
1894 if (!CFS_FAIL_CHECK(CFS_FAIL_GNI_ONLY_NOOP)) {
1895 tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, peer->gnp_net->gnn_ni->ni_nid);
1897 CNETERR("can't get TX to initiate NOOP to %s\n",
1898 libcfs_nid2str(peer->gnp_nid));
1900 kgnilnd_queue_tx(conn, tx);
1904 /* Schedule all packets blocking for a connection */
1905 list_for_each_entry_safe(tx, txn, &peer->gnp_tx_queue, tx_list) {
1906 /* lock held here is the peer_conn lock */
1907 kgnilnd_tx_del_state_locked(tx, peer, NULL, GNILND_TX_ALLOCD);
1908 kgnilnd_queue_tx(conn, tx);
1911 /* If this is an active connection lets mark its timestamp on the MBoX */
1912 if (dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
1913 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1914 /* conn->gnc_last_rx is jiffies it better exist as it was just set */
1915 mbox->mbx_release_purg_active_dgram = conn->gnc_last_rx;
1918 /* Bug 765042: wake up scheduler for a race with finish_connect and
1919 * complete_conn_closed with a conn in purgatory
1920 * since we can't use CFS_RACE due to mutex_holds in kgnilnd_process_conns,
1921 * we just check for set and then clear */
1922 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG)) {
1924 /* get scheduler thread moving again */
1925 kgnilnd_schedule_device(conn->gnc_device);
1928 CDEBUG(D_NET, "New conn 0x%p->%s dev %d\n",
1929 conn, libcfs_nid2str(her_nid), conn->gnc_device->gnd_id);
1931 /* make sure we reset peer reconnect interval now that we have a good conn */
1932 kgnilnd_peer_alive(peer);
1933 peer->gnp_reconnect_interval = 0;
1935 /* clear the unlink attribute if we dont clear it kgnilnd_del_conn_or_peer will wait
1936 * on the atomic forever
1938 if (peer->gnp_pending_unlink) {
1939 peer->gnp_pending_unlink = 0;
1940 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_unlink);
1941 CDEBUG(D_NET, "Clearing peer unlink %p\n",peer);
1944 /* add ref to make it hang around until after we drop the lock */
1945 kgnilnd_conn_addref(conn);
1947 /* Once the peer_conn lock is dropped, the conn could actually move into
1948 * CLOSING->CLOSED->DONE in the scheduler thread, so hold the
1949 * lock until we are really done */
1950 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1952 /* Notify LNET that we now have a working connection to this peer.
1953 * This is a Cray extension to the "standard" LND behavior.
1955 lnet_notify(peer->gnp_net->gnn_ni, peer->gnp_nid, true, true,
1956 ktime_get_seconds());
1958 /* drop our 'hold' ref */
1959 kgnilnd_conn_decref(conn);
1966 kgnilnd_send_nak(kgn_device_t *dev, lnet_nid_t dst_nid, int error)
1971 LASSERTF(dst_nid != LNET_NID_ANY, "bad dst_nid %s\n", libcfs_nid2str(dst_nid));
1973 CDEBUG(D_NET, "NAK to %s errno %d\n", libcfs_nid2str(dst_nid), error);
1975 rc = kgnilnd_post_dgram(dev, dst_nid, GNILND_CONNREQ_NAK, error);
1978 CDEBUG(D_NET, "NAK to %s failed: rc %d \n", libcfs_nid2str(dst_nid), rc);
1984 kgnilnd_process_nak(kgn_dgram_t *dgram)
1986 kgn_connreq_t *connreq = &dgram->gndg_conn_in;
1987 lnet_nid_t src_nid = connreq->gncr_srcnid;
1988 int errno = connreq->gncr_nakdata.gnnd_errno;
1992 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1994 peer = kgnilnd_find_peer_locked(src_nid);
1996 /* we likely dropped him from bad data when we processed
1997 * the original REQ */
1998 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2002 /* need to check peerstamp/connstamp against the ones we find
2003 * to make sure we don't close new (and good?) conns that we
2004 * formed after this connreq failed */
2005 if (peer->gnp_connecting == GNILND_PEER_IDLE) {
2008 if (list_empty(&peer->gnp_conns)) {
2009 /* assume already procced datagram and it barfed up
2010 * on this side too */
2011 CDEBUG(D_NET, "dropping NAK from %s; "
2012 "peer %s is already not connected\n",
2013 libcfs_nid2str(connreq->gncr_srcnid),
2014 libcfs_nid2str(connreq->gncr_dstnid));
2015 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2019 /* stub up a connection with the connreq XXX_stamps to allow
2020 * use to use close_stale_conns_locked */
2021 conn.gnc_peerstamp = connreq->gncr_peerstamp;
2022 conn.gnc_my_connstamp = connreq->gncr_connstamp;
2023 conn.gnc_peer_connstamp = connreq->gncr_connstamp;
2024 conn.gnc_device = peer->gnp_net->gnn_dev;
2026 rc = kgnilnd_close_stale_conns_locked(peer, &conn);
2028 LCONSOLE_INFO("Received NAK from %s for %s errno %d; "
2029 "closed %d connections\n",
2030 libcfs_nid2str(connreq->gncr_srcnid),
2031 libcfs_nid2str(connreq->gncr_dstnid), errno, rc);
2033 spin_lock(&dgram->gndg_conn->gnc_device->gnd_connd_lock);
2035 if (list_empty(&peer->gnp_connd_list)) {
2036 /* if peer isn't on waiting list, try to find one to nuke */
2037 rc = kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev,
2041 LCONSOLE_INFO("Received NAK from %s for %s errno %d; "
2042 "canceled pending connect request\n",
2043 libcfs_nid2str(connreq->gncr_srcnid),
2044 libcfs_nid2str(connreq->gncr_dstnid), errno);
2047 /* if we can't find a waiting dgram, we just drop the nak - the conn
2048 * connect must have failed (didn't find conn above and clear connecting
2049 * -- so nothing to do besides drop */
2051 /* peer is on list, meaning it is a new connect attempt from the one
2052 * we started that generated the NAK - so just drop NAK */
2054 /* use negative to prevent error message */
2057 spin_unlock(&dgram->gndg_conn->gnc_device->gnd_connd_lock);
2060 /* success! we found a peer and at least marked pending_nak */
2061 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2067 kgnilnd_process_connreq(kgn_dgram_t *dgram, int *needs_nak)
2071 rc = kgnilnd_unpack_connreq(dgram);
2074 /* only NAK if we have good srcnid to use */
2080 switch (dgram->gndg_conn_in.gncr_type) {
2081 case GNILND_CONNREQ_REQ:
2082 /* wire up peer & conn, send queued TX */
2083 rc = kgnilnd_finish_connect(dgram);
2085 /* don't nak when the nid is hosed */
2091 case GNILND_CONNREQ_NAK:
2092 rc = kgnilnd_process_nak(dgram);
2093 /* return early to prevent reconnect bump */
2096 CERROR("unexpected connreq type %s (%d) from %s\n",
2097 kgnilnd_connreq_type2str(&dgram->gndg_conn_in),
2098 dgram->gndg_conn_in.gncr_type,
2099 libcfs_nid2str(dgram->gndg_conn_in.gncr_srcnid));
2110 kgnilnd_probe_and_process_dgram(kgn_device_t *dev)
2114 lnet_nid_t nak_dstnid = LNET_NID_ANY;
2115 lnet_nid_t orig_dstnid;
2116 kgn_dgram_t *dgram = NULL;
2120 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PAUSE_DGRAM_COMP)) {
2123 rc = kgnilnd_probe_for_dgram(dev, &dgram);
2128 } else if (rc < 0) {
2129 GOTO(inform_peer, rc);
2131 /* rc > 1 means it did something, reset for this func */
2135 switch (dgram->gndg_type) {
2136 case GNILND_DGRAM_WC_REQ:
2137 case GNILND_DGRAM_REQ:
2138 rc = kgnilnd_process_connreq(dgram, &needs_nak);
2140 case GNILND_DGRAM_NAK:
2141 CDEBUG(D_NETTRACE, "NAK to %s done\n",
2142 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid));
2145 CERROR("unknown datagram type %s (%d)\n",
2146 kgnilnd_dgram_type2str(dgram), dgram->gndg_type);
2150 /* stash data to use after releasing current datagram */
2151 /* don't stash net - we are operating on a net already,
2152 * so the lock on rw_net_lock is sufficient */
2154 nak_dstnid = dgram->gndg_conn_in.gncr_srcnid;
2157 LASSERTF(dgram != NULL, "dgram 0x%p rc %d needs_nak %d\n", dgram, rc, needs_nak);
2159 orig_dstnid = dgram->gndg_conn_out.gncr_dstnid;
2161 kgnilnd_release_dgram(dev, dgram, 0);
2163 CDEBUG(D_NET, "cleaning up dgram to %s, rc %d\n",
2164 libcfs_nid2str(orig_dstnid), rc);
2166 /* if this was a WC_REQ that matched an existing peer, it'll get marked done
2167 * in kgnilnd_finish_connect - if errors are from before we get to there,
2168 * we just drop as it is a WC_REQ - the peer CAN'T be waiting for it */
2169 if ((orig_dstnid != LNET_NID_ANY) && (rc < 0)) {
2170 /* if we have a negative rc, we want to find a peer to inform about
2171 * the bad connection attempt. Sorry buddy, better luck next time! */
2173 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2174 peer = kgnilnd_find_peer_locked(orig_dstnid);
2177 /* add ref to make sure he stays around past the possible unlink
2178 * so we can tell LNet about him */
2179 kgnilnd_peer_addref(peer);
2181 /* if he still cares about the outstanding connect */
2182 if (peer->gnp_connecting >= GNILND_PEER_CONNECT) {
2183 /* check if he is on the connd list and remove.. */
2184 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2185 if (!list_empty(&peer->gnp_connd_list)) {
2186 list_del_init(&peer->gnp_connd_list);
2187 /* drop connd ref */
2188 kgnilnd_peer_decref(peer);
2190 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2192 /* clear gnp_connecting so we don't have a non-connecting peer
2193 * on gnd_connd_list */
2194 peer->gnp_connecting = GNILND_PEER_IDLE;
2196 set_mb(peer->gnp_last_dgram_errno, rc);
2198 kgnilnd_peer_increase_reconnect_locked(peer);
2201 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2203 /* now that we are outside the lock, tell Mommy */
2205 kgnilnd_peer_notify(peer, rc, 0);
2206 kgnilnd_peer_decref(peer);
2211 kgnilnd_send_nak(dev, nak_dstnid, rc);
2218 kgnilnd_reaper_dgram_check(kgn_device_t *dev)
2220 kgn_dgram_t *dgram, *tmp;
2223 spin_lock(&dev->gnd_dgram_lock);
2225 for (i = 0; i < (*kgnilnd_tunables.kgn_peer_hash_size - 1); i++) {
2226 list_for_each_entry_safe(dgram, tmp, &dev->gnd_dgrams[i], gndg_list) {
2227 unsigned long now = jiffies;
2228 unsigned long timeout;
2230 /* don't timeout stuff if the network is mucked or shutting down */
2231 if (kgnilnd_check_hw_quiesce()) {
2235 if ((dgram->gndg_state != GNILND_DGRAM_POSTED) ||
2236 (dgram->gndg_type == GNILND_DGRAM_WC_REQ)) {
2239 CDEBUG(D_NETTRACE, "checking dgram 0x%p type %s "
2240 "state %s conn 0x%p to %s age %lus\n",
2241 dgram, kgnilnd_dgram_type2str(dgram),
2242 kgnilnd_dgram_state2str(dgram), dgram->gndg_conn,
2243 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
2244 cfs_duration_sec(now - dgram->gndg_post_time));
2246 timeout = cfs_time_seconds(*kgnilnd_tunables.kgn_timeout);
2248 if (time_before(now, (dgram->gndg_post_time + timeout)))
2251 CNETERR("%s datagram to %s timed out @ %lus dgram "
2252 "0x%p state %s conn 0x%p\n",
2253 kgnilnd_dgram_type2str(dgram),
2254 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
2255 cfs_duration_sec(now - dgram->gndg_post_time),
2256 dgram, kgnilnd_dgram_state2str(dgram),
2259 kgnilnd_cancel_dgram_locked(dgram);
2262 spin_unlock(&dev->gnd_dgram_lock);
2266 /* use a thread for the possibly long-blocking wait_by_id to prevent
2267 * stalling the global workqueues */
2269 kgnilnd_dgram_waitq(void *arg)
2271 kgn_device_t *dev = (kgn_device_t *) arg;
2275 DEFINE_WAIT(mover_done);
2277 snprintf(name, sizeof(name), "kgnilnd_dgn_%02d", dev->gnd_id);
2279 /* all gnilnd threads need to run fairly urgently */
2280 set_user_nice(current, *kgnilnd_tunables.kgn_nice);
2282 /* we dont shut down until the device shuts down ... */
2283 while (!kgnilnd_data.kgn_shutdown) {
2284 /* to quiesce or to not quiesce, that is the question */
2285 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
2286 KGNILND_SPIN_QUIESCE;
2289 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_PAUSE_DGRAM_COMP, 1)) {}
2291 /* check once a second */
2292 grc = kgnilnd_postdata_probe_wait_by_id(dev->gnd_handle,
2295 if (grc == GNI_RC_SUCCESS) {
2296 CDEBUG(D_INFO, "waking up dgram mover thread\n");
2297 kgnilnd_schedule_dgram(dev);
2299 /* wait for dgram thread to ping us before spinning again */
2300 prepare_to_wait(&dev->gnd_dgping_waitq, &mover_done,
2301 TASK_INTERRUPTIBLE);
2303 /* don't sleep if we need to quiesce */
2304 if (likely(!kgnilnd_data.kgn_quiesce_trigger)) {
2307 finish_wait(&dev->gnd_dgping_waitq, &mover_done);
2311 kgnilnd_thread_fini();
2316 kgnilnd_start_outbound_dgrams(kgn_device_t *dev, unsigned long deadline)
2318 int did_something = 0, rc;
2319 kgn_peer_t *peer = NULL;
2321 spin_lock(&dev->gnd_connd_lock);
2323 /* Active connect - we added this in kgnilnd_launch_tx */
2324 while (!list_empty(&dev->gnd_connd_peers) && time_before(jiffies, deadline)) {
2325 peer = list_first_entry(&dev->gnd_connd_peers,
2326 kgn_peer_t, gnp_connd_list);
2328 /* ref for connd removed in if/else below */
2329 list_del_init(&peer->gnp_connd_list);
2331 /* gnp_connecting and membership on gnd_connd_peers should be
2332 * done coherently to avoid double adding, etc */
2333 /* don't need kgnilnd_data.kgn_peer_conn_lock here as that is only needed
2334 * to get the peer to gnp_connecting in the first place. We just need to
2335 * rely on gnd_connd_lock to serialize someone pulling him from the list
2336 * BEFORE clearing gnp_connecting */
2337 LASSERTF(peer->gnp_connecting != GNILND_PEER_IDLE, "peer 0x%p->%s not connecting\n",
2338 peer, libcfs_nid2str(peer->gnp_nid));
2340 spin_unlock(&dev->gnd_connd_lock);
2342 CDEBUG(D_NET, "processing connect to %s\n",
2343 libcfs_nid2str(peer->gnp_nid));
2346 rc = kgnilnd_start_connect(peer);
2348 if (likely(rc >= 0)) {
2349 /* 0 on success, positive on 'just drop peer' errors */
2350 kgnilnd_peer_decref(peer);
2351 } else if (rc == -ENOMEM) {
2352 /* if we are out of wildcards, add back to
2353 * connd_list - then break out and we'll try later
2354 * if other errors, we'll bail & cancel pending tx */
2355 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2356 if (peer->gnp_connecting == GNILND_PEER_POSTING) {
2357 peer->gnp_connecting = GNILND_PEER_CONNECT;
2358 spin_lock(&dev->gnd_connd_lock);
2359 list_add_tail(&peer->gnp_connd_list,
2360 &dev->gnd_connd_peers);
2362 /* connecting changed while we were posting */
2364 LASSERTF(peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH, "Peer is in invalid"
2365 " state 0x%p->%s, connecting %d\n",
2366 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
2367 peer->gnp_connecting = GNILND_PEER_KILL;
2368 spin_lock(&dev->gnd_connd_lock);
2369 /* remove the peer ref frrom the cond list */
2370 kgnilnd_peer_decref(peer);
2371 /* let the system handle itself */
2373 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2374 /* the datagrams are a global pool,
2375 * so break out of trying and hope some free
2380 /* something bad happened, you lose */
2381 CNETERR("could not start connecting to %s "
2382 "rc %d: Will retry until TX timeout\n",
2383 libcfs_nid2str(peer->gnp_nid), rc);
2384 /* It didnt post so just set connecting back to zero now.
2385 * The reaper will reattempt the connection if it needs too.
2386 * If the peer needs death set it so the reaper will cleanup.
2388 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2389 if (peer->gnp_connecting == GNILND_PEER_POSTING) {
2390 peer->gnp_connecting = GNILND_PEER_IDLE;
2391 kgnilnd_peer_increase_reconnect_locked(peer);
2393 LASSERTF(peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH, "Peer is in invalid"
2394 " state 0x%p->%s, connecting %d\n",
2395 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
2396 peer->gnp_connecting = GNILND_PEER_KILL;
2398 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2400 /* hold onto ref until we are really done - if it was
2401 * unlinked this could result in a destroy */
2402 kgnilnd_peer_decref(peer);
2404 spin_lock(&dev->gnd_connd_lock);
2407 spin_unlock(&dev->gnd_connd_lock);
2408 RETURN(did_something);
2412 kgnilnd_repost_wc_dgrams(kgn_device_t *dev)
2414 int did_something = 0, to_repost, i;
2415 to_repost = atomic_read(&dev->gnd_nwcdgrams);
2418 for (i = 0; i < to_repost; ++i) {
2420 rerc = kgnilnd_post_dgram(dev, LNET_NID_ANY, GNILND_CONNREQ_REQ, 0);
2422 kgnilnd_admin_decref(dev->gnd_nwcdgrams);
2425 CDEBUG(D_NETERROR, "error %d: dev %d could not post wildcard datagram\n",
2431 RETURN(did_something);
2435 kgnilnd_dgram_poke_with_stick(unsigned long arg)
2438 kgn_device_t *dev = &kgnilnd_data.kgn_devices[dev_id];
2440 wake_up(&dev->gnd_dgram_waitq);
2443 /* use single thread for dgrams - should be sufficient for performance */
2445 kgnilnd_dgram_mover(void *arg)
2447 kgn_device_t *dev = (kgn_device_t *)arg;
2449 int rc, did_something;
2450 unsigned long next_purge_check = jiffies - 1;
2451 unsigned long timeout;
2452 struct timer_list timer;
2453 unsigned long deadline = 0;
2456 snprintf(name, sizeof(name), "kgnilnd_dg_%02d", dev->gnd_id);
2458 /* all gnilnd threads need to run fairly urgently */
2459 set_user_nice(current, *kgnilnd_tunables.kgn_nice);
2461 /* we are ok not locking for these variables as the dgram waitq threads
2462 * will block both due to tying up net (kgn_shutdown) and the completion
2463 * event for the dgram_waitq (kgn_quiesce_trigger) */
2464 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_dgram_timeout);
2465 while (!kgnilnd_data.kgn_shutdown) {
2466 /* Safe: kgn_shutdown only set when quiescent */
2468 /* race with stack reset - we want to hold off seeing any new incoming dgrams
2469 * so we can force a dirty WC dgram for Bug 762072 - put right before
2470 * quiesce check so that it'll go right into that and not do any
2472 CFS_RACE(CFS_FAIL_GNI_WC_DGRAM_FREE);
2474 /* to quiesce or to not quiesce, that is the question */
2475 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
2476 KGNILND_SPIN_QUIESCE;
2480 CFS_RACE(CFS_FAIL_GNI_QUIESCE_RACE);
2482 /* process any newly completed dgrams */
2483 down_read(&kgnilnd_data.kgn_net_rw_sem);
2485 rc = kgnilnd_probe_and_process_dgram(dev);
2487 did_something += rc;
2490 up_read(&kgnilnd_data.kgn_net_rw_sem);
2492 CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_DGRAM_DEADLINE,
2493 (*kgnilnd_tunables.kgn_dgram_timeout + 1));
2494 /* start new outbound dgrams */
2495 did_something += kgnilnd_start_outbound_dgrams(dev, deadline);
2497 /* find dead dgrams */
2498 if (time_after_eq(jiffies, next_purge_check)) {
2499 /* these don't need to be checked that often */
2500 kgnilnd_reaper_dgram_check(dev);
2502 next_purge_check = (long) jiffies +
2503 cfs_time_seconds(kgnilnd_data.kgn_new_min_timeout / 4);
2506 did_something += kgnilnd_repost_wc_dgrams(dev);
2508 /* careful with the jiffy wrap... */
2509 timeout = (long)(next_purge_check - jiffies);
2511 CDEBUG(D_INFO, "did %d timeout %lu next %lu jiffies %lu\n",
2512 did_something, timeout, next_purge_check, jiffies);
2514 if ((did_something || timeout <= 0) && time_before(jiffies, deadline)) {
2519 prepare_to_wait(&dev->gnd_dgram_waitq, &wait, TASK_INTERRUPTIBLE);
2521 setup_timer(&timer, kgnilnd_dgram_poke_with_stick, dev->gnd_id);
2522 mod_timer(&timer, (long) jiffies + timeout);
2524 /* last second chance for others to poke us */
2525 did_something += xchg(&dev->gnd_dgram_ready, GNILND_DGRAM_IDLE);
2527 /* check flag variables before committing even if we
2528 * did something; if we are after the deadline call
2530 if ((!did_something || time_after(jiffies, deadline)) &&
2531 !kgnilnd_data.kgn_shutdown &&
2532 !kgnilnd_data.kgn_quiesce_trigger) {
2533 CDEBUG(D_INFO, "schedule timeout %ld (%lu sec)\n",
2534 timeout, cfs_duration_sec(timeout));
2535 wake_up_all(&dev->gnd_dgping_waitq);
2537 CDEBUG(D_INFO, "awake after schedule\n");
2538 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_dgram_timeout);
2541 del_singleshot_timer_sync(&timer);
2542 finish_wait(&dev->gnd_dgram_waitq, &wait);
2545 kgnilnd_thread_fini();