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.
27 #include <linux/swap.h>
30 kgnilnd_setup_smsg_attr(gni_smsg_attr_t *smsg_attr)
32 smsg_attr->mbox_maxcredit = *kgnilnd_tunables.kgn_mbox_credits;
33 smsg_attr->msg_maxsize = GNILND_MAX_MSG_SIZE;
34 smsg_attr->msg_type = GNI_SMSG_TYPE_MBOX_AUTO_RETRANSMIT;
38 kgnilnd_map_fmablk(kgn_device_t *device, kgn_fma_memblock_t *fma_blk)
41 __u32 flags = GNI_MEM_READWRITE;
42 static unsigned long reg_to;
43 int rfto = *kgnilnd_tunables.kgn_reg_fail_timeout;
45 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS) {
46 flags |= GNI_MEM_PHYS_CONT;
49 fma_blk->gnm_hold_timeout = 0;
51 /* make sure we are mapping a clean block */
52 LASSERTF(fma_blk->gnm_hndl.qword1 == 0UL, "fma_blk %p dirty\n", fma_blk);
54 rrc = kgnilnd_mem_register(device->gnd_handle, (__u64)fma_blk->gnm_block,
55 fma_blk->gnm_blk_size, device->gnd_rcv_fma_cqh,
56 flags, &fma_blk->gnm_hndl);
57 if (rrc != GNI_RC_SUCCESS) {
58 if (rfto != GNILND_REGFAILTO_DISABLE) {
60 reg_to = jiffies + cfs_time_seconds(rfto);
61 } else if (time_after(jiffies, reg_to)) {
62 CERROR("FATAL:fmablk registration has failed "
64 cfs_duration_sec(jiffies - reg_to) +
70 CNETERR("register fmablk failed 0x%p mbox_size %d flags %u\n",
71 fma_blk, fma_blk->gnm_mbox_size, flags);
77 /* PHYS_CONT memory isn't really mapped, at least not in GART -
78 * but all mappings chew up a MDD
80 if (fma_blk->gnm_state != GNILND_FMABLK_PHYS) {
81 atomic64_add(fma_blk->gnm_blk_size, &device->gnd_nbytes_map);
84 atomic_inc(&device->gnd_n_mdd);
85 /* nfmablk is live (mapped) blocks */
86 atomic_inc(&device->gnd_nfmablk);
92 kgnilnd_alloc_fmablk(kgn_device_t *device, int use_phys)
96 kgn_fma_memblock_t *fma_blk;
97 gni_smsg_attr_t smsg_attr;
98 unsigned long fmablk_vers;
100 #if defined(CONFIG_CRAY_XT) && !defined(CONFIG_CRAY_COMPUTE)
101 /* We allocate large blocks of memory here potentially leading
102 * to memory exhaustion during massive reconnects during a network
103 * outage. Limit the amount of fma blocks to use by always keeping
104 * a percent of pages free initially set to 25% of total memory. */
105 if (nr_free_pages() < kgnilnd_data.free_pages_limit) {
106 LCONSOLE_INFO("Exceeding free page limit of %ld. "
107 "Free pages available %ld\n",
108 kgnilnd_data.free_pages_limit,
113 /* we'll use fmablk_vers and the gnd_fmablk_mutex to gate access
114 * to this allocation code. Everyone will sample the version
115 * before and after getting the mutex. If it has changed,
116 * we'll bail out to check the lists again - this indicates that
117 * some sort of change was made to the lists and it is possible
118 * that there is a mailbox for us to find now. This should prevent
119 * a ton of spinning in the case where there are lots of threads
120 * that need a yet-to-be-allocated mailbox for a connection. */
122 fmablk_vers = atomic_read(&device->gnd_fmablk_vers);
123 mutex_lock(&device->gnd_fmablk_mutex);
125 if (fmablk_vers != atomic_read(&device->gnd_fmablk_vers)) {
126 /* version changed while we were waiting for semaphore,
127 * we'll recheck the lists assuming something nice happened */
128 mutex_unlock(&device->gnd_fmablk_mutex);
132 LIBCFS_ALLOC(fma_blk, sizeof(kgn_fma_memblock_t));
133 if (fma_blk == NULL) {
134 CNETERR("could not allocate fma block descriptor\n");
139 INIT_LIST_HEAD(&fma_blk->gnm_bufflist);
141 kgnilnd_setup_smsg_attr(&smsg_attr);
143 gni_smsg_buff_size_needed(&smsg_attr, &fma_blk->gnm_mbox_size);
145 LASSERTF(fma_blk->gnm_mbox_size, "mbox size %d\n", fma_blk->gnm_mbox_size);
147 /* gni_smsg_buff_size_needed calculates the base mailbox size and since
148 * we want to hold kgn_peer_credits worth of messages in both directions,
149 * we add PAYLOAD to grow the mailbox size
152 fma_blk->gnm_mbox_size += GNILND_MBOX_PAYLOAD;
154 /* we'll only use physical during preallocate at startup -- this keeps it nice and
155 * clean for runtime decisions. We'll keep the PHYS ones around until shutdown
156 * as reallocating them is tough if there is memory fragmentation */
159 fma_blk->gnm_block = kmem_cache_alloc(kgnilnd_data.kgn_mbox_cache, GFP_ATOMIC);
160 if (fma_blk->gnm_block == NULL) {
161 CNETERR("could not allocate physical SMSG mailbox memory\n");
165 fma_blk->gnm_blk_size = GNILND_MBOX_SIZE;
166 num_mbox = fma_blk->gnm_blk_size / fma_blk->gnm_mbox_size;
168 LASSERTF(num_mbox >= 1,
169 "num_mbox %d blk_size %u mbox_size %d\n",
170 num_mbox, fma_blk->gnm_blk_size, fma_blk->gnm_mbox_size);
172 fma_blk->gnm_state = GNILND_FMABLK_PHYS;
175 num_mbox = *kgnilnd_tunables.kgn_mbox_per_block;
176 fma_blk->gnm_blk_size = num_mbox * fma_blk->gnm_mbox_size;
178 LASSERTF(num_mbox >= 1 && num_mbox >= *kgnilnd_tunables.kgn_mbox_per_block,
179 "num_mbox %d blk_size %u mbox_size %d tunable %d\n",
180 num_mbox, fma_blk->gnm_blk_size, fma_blk->gnm_mbox_size,
181 *kgnilnd_tunables.kgn_mbox_per_block);
183 fma_blk->gnm_block = kgnilnd_vzalloc(fma_blk->gnm_blk_size);
184 if (fma_blk->gnm_block == NULL) {
185 CNETERR("could not allocate virtual SMSG mailbox memory, %d bytes\n", fma_blk->gnm_blk_size);
190 fma_blk->gnm_state = GNILND_FMABLK_VIRT;
193 /* allocate just enough space for the bits to track the mailboxes */
194 CFS_ALLOC_PTR_ARRAY(fma_blk->gnm_bit_array, BITS_TO_LONGS(num_mbox));
195 if (fma_blk->gnm_bit_array == NULL) {
196 CNETERR("could not allocate mailbox bitmask, %lu bytes for %d mbox\n",
197 sizeof(unsigned long) * BITS_TO_LONGS(num_mbox), num_mbox);
201 bitmap_zero(fma_blk->gnm_bit_array, num_mbox);
203 /* now that the num_mbox is set based on allocation type, get debug
206 CFS_ALLOC_PTR_ARRAY(fma_blk->gnm_mbox_info, num_mbox);
207 if (fma_blk->gnm_mbox_info == NULL) {
208 CNETERR("could not allocate mailbox debug, %lu bytes for %d mbox\n",
209 sizeof(kgn_mbox_info_t) * num_mbox, num_mbox);
214 rc = kgnilnd_map_fmablk(device, fma_blk);
219 fma_blk->gnm_next_avail_mbox = 0;
220 fma_blk->gnm_avail_mboxs = fma_blk->gnm_num_mboxs = num_mbox;
222 CDEBUG(D_MALLOC, "alloc fmablk 0x%p num %d msg_maxsize %d credits %d "
223 "mbox_size %d MDD %#llx.%#llx\n",
224 fma_blk, num_mbox, smsg_attr.msg_maxsize, smsg_attr.mbox_maxcredit,
225 fma_blk->gnm_mbox_size, fma_blk->gnm_hndl.qword1,
226 fma_blk->gnm_hndl.qword2);
228 /* lock Is protecting data structures, not semaphore */
230 spin_lock(&device->gnd_fmablk_lock);
231 list_add_tail(&fma_blk->gnm_bufflist, &device->gnd_fma_buffs);
233 /* toggle under the lock so once they change the list is also
234 * ready for others to traverse */
235 atomic_inc(&device->gnd_fmablk_vers);
237 spin_unlock(&device->gnd_fmablk_lock);
239 mutex_unlock(&device->gnd_fmablk_mutex);
244 CFS_FREE_PTR_ARRAY(fma_blk->gnm_mbox_info, num_mbox);
246 CFS_FREE_PTR_ARRAY(fma_blk->gnm_bit_array, BITS_TO_LONGS(num_mbox));
248 if (fma_blk->gnm_state == GNILND_FMABLK_VIRT) {
249 kgnilnd_vfree(fma_blk->gnm_block, fma_blk->gnm_blk_size);
251 kmem_cache_free(kgnilnd_data.kgn_mbox_cache, fma_blk->gnm_block);
254 LIBCFS_FREE(fma_blk, sizeof(kgn_fma_memblock_t));
256 mutex_unlock(&device->gnd_fmablk_mutex);
261 kgnilnd_unmap_fmablk(kgn_device_t *dev, kgn_fma_memblock_t *fma_blk)
265 /* if some held, set hold_timeout from conn timeouts used in this block
266 * but not during shutdown, then just nuke and pave
267 * During a stack reset, we need to deregister with a hold timeout
268 * set so we don't use the same mdd after reset is complete */
269 if ((fma_blk->gnm_held_mboxs && !kgnilnd_data.kgn_shutdown) ||
270 kgnilnd_data.kgn_in_reset) {
271 fma_blk->gnm_hold_timeout = GNILND_TIMEOUT2DEADMAN;
274 /* we are changing the state of a block, tickle version to tell
275 * proc code list is stale now */
276 atomic_inc(&dev->gnd_fmablk_vers);
278 rrc = kgnilnd_mem_deregister(dev->gnd_handle, &fma_blk->gnm_hndl, fma_blk->gnm_hold_timeout);
280 CDEBUG(rrc == GNI_RC_SUCCESS ? D_MALLOC : D_CONSOLE|D_NETERROR,
281 "unmap fmablk 0x%p@%s sz %u total %d avail %d held %d mbox_size %d "
283 fma_blk, kgnilnd_fmablk_state2str(fma_blk->gnm_state),
284 fma_blk->gnm_blk_size, fma_blk->gnm_num_mboxs,
285 fma_blk->gnm_avail_mboxs, fma_blk->gnm_held_mboxs,
286 fma_blk->gnm_mbox_size, fma_blk->gnm_hold_timeout);
288 LASSERTF(rrc == GNI_RC_SUCCESS,
289 "tried to double unmap or something bad, fma_blk %p (rrc %d)\n",
292 if (fma_blk->gnm_hold_timeout &&
293 !(kgnilnd_data.kgn_in_reset &&
294 fma_blk->gnm_state == GNILND_FMABLK_PHYS)) {
295 atomic_inc(&dev->gnd_n_mdd_held);
297 atomic_dec(&dev->gnd_n_mdd);
300 /* PHYS blocks don't get mapped */
301 if (fma_blk->gnm_state != GNILND_FMABLK_PHYS) {
302 atomic64_sub(fma_blk->gnm_blk_size, &dev->gnd_nbytes_map);
303 fma_blk->gnm_state = GNILND_FMABLK_IDLE;
304 } else if (kgnilnd_data.kgn_in_reset) {
305 /* in stack reset, clear MDD handle for PHYS blocks, as we'll
306 * re-use the fma_blk after reset so we don't have to drop/allocate
307 * all of those physical blocks */
308 fma_blk->gnm_hndl.qword1 = fma_blk->gnm_hndl.qword2 = 0UL;
311 /* Decrement here as this is the # of mapped blocks */
312 atomic_dec(&dev->gnd_nfmablk);
316 /* needs lock on gnd_fmablk_lock to cover gnd_fma_buffs */
318 kgnilnd_free_fmablk_locked(kgn_device_t *dev, kgn_fma_memblock_t *fma_blk)
320 LASSERTF(fma_blk->gnm_avail_mboxs == fma_blk->gnm_num_mboxs,
321 "fma_blk %p@%d free in bad state (%d): blk total %d avail %d held %d\n",
322 fma_blk, fma_blk->gnm_state, fma_blk->gnm_hold_timeout, fma_blk->gnm_num_mboxs,
323 fma_blk->gnm_avail_mboxs, fma_blk->gnm_held_mboxs);
325 atomic_inc(&dev->gnd_fmablk_vers);
327 if (fma_blk->gnm_hold_timeout) {
328 CDEBUG(D_MALLOC, "mdd release fmablk 0x%p sz %u avail %d held %d "
330 fma_blk, fma_blk->gnm_blk_size, fma_blk->gnm_avail_mboxs,
331 fma_blk->gnm_held_mboxs, fma_blk->gnm_mbox_size);
333 /* We leave MDD dangling over stack reset */
334 if (!kgnilnd_data.kgn_in_reset) {
335 kgnilnd_mem_mdd_release(dev->gnd_handle, &fma_blk->gnm_hndl);
337 /* ignoring the return code - if kgni/ghal can't find it
338 * it must be released already */
339 atomic_dec(&dev->gnd_n_mdd_held);
340 atomic_dec(&dev->gnd_n_mdd);
343 /* we cant' free the gnm_block until all the conns have released their
344 * purgatory holds. While we have purgatory holds, we might check the conn
345 * RX mailbox during the CLOSING process. It is possible that kgni might
346 * try to look into the RX side for credits when sending the CLOSE msg too */
347 CDEBUG(D_MALLOC, "fmablk %p free buffer %p mbox_size %d\n",
348 fma_blk, fma_blk->gnm_block, fma_blk->gnm_mbox_size);
350 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS) {
351 kmem_cache_free(kgnilnd_data.kgn_mbox_cache, fma_blk->gnm_block);
353 kgnilnd_vfree(fma_blk->gnm_block, fma_blk->gnm_blk_size);
355 fma_blk->gnm_state = GNILND_FMABLK_FREED;
357 list_del(&fma_blk->gnm_bufflist);
359 CFS_FREE_PTR_ARRAY(fma_blk->gnm_mbox_info, fma_blk->gnm_num_mboxs);
360 CFS_FREE_PTR_ARRAY(fma_blk->gnm_bit_array,
361 BITS_TO_LONGS(fma_blk->gnm_num_mboxs));
362 LIBCFS_FREE(fma_blk, sizeof(kgn_fma_memblock_t));
366 kgnilnd_find_free_mbox(kgn_conn_t *conn)
368 kgn_device_t *dev = conn->gnc_device;
369 gni_smsg_attr_t *smsg_attr = &conn->gnpr_smsg_attr;
370 kgn_fma_memblock_t *fma_blk;
371 kgn_mbox_info_t *mbox = NULL;
374 spin_lock(&dev->gnd_fmablk_lock);
376 list_for_each_entry(fma_blk, &conn->gnc_device->gnd_fma_buffs,
378 if (fma_blk->gnm_avail_mboxs <= 0 ||
379 fma_blk->gnm_state <= GNILND_FMABLK_IDLE) {
382 /* look in bitarray for available mailbox */
384 id = find_next_zero_bit(
385 fma_blk->gnm_bit_array,
386 fma_blk->gnm_num_mboxs,
387 fma_blk->gnm_next_avail_mbox);
388 if (id == fma_blk->gnm_num_mboxs &&
389 fma_blk->gnm_next_avail_mbox != 0) {
391 fma_blk->gnm_next_avail_mbox = 0;
397 LASSERTF(id < fma_blk->gnm_num_mboxs, "id %d max %d\n",
398 id, fma_blk->gnm_num_mboxs);
399 set_bit(id, (volatile unsigned long *)fma_blk->gnm_bit_array);
400 conn->gnc_mbox_id = id;
402 fma_blk->gnm_next_avail_mbox =
403 (id == (fma_blk->gnm_num_mboxs - 1)) ? 0 : (id + 1);
404 fma_blk->gnm_avail_mboxs--;
405 conn->gnc_fma_blk = fma_blk;
407 kgnilnd_setup_smsg_attr(smsg_attr);
409 smsg_attr->msg_buffer = fma_blk->gnm_block;
410 smsg_attr->mbox_offset = fma_blk->gnm_mbox_size * id;
411 smsg_attr->mem_hndl = fma_blk->gnm_hndl;
412 smsg_attr->buff_size = fma_blk->gnm_mbox_size;
414 /* We'll set the hndl to zero for PHYS blocks unmapped during stack
415 * reset and re-use the same fma_blk after stack reset. This ensures we've
416 * properly mapped it before we use it */
417 LASSERTF(fma_blk->gnm_hndl.qword1 != 0UL, "unmapped fma_blk %p, state %d\n",
418 fma_blk, fma_blk->gnm_state);
420 CDEBUG(D_NET, "conn %p smsg %p fmablk %p "
421 "allocating SMSG mbox %d buf %p "
422 "offset %u hndl %#llx.%#llx\n",
423 conn, smsg_attr, fma_blk, id,
424 smsg_attr->msg_buffer, smsg_attr->mbox_offset,
425 fma_blk->gnm_hndl.qword1,
426 fma_blk->gnm_hndl.qword2);
428 mbox = &fma_blk->gnm_mbox_info[id];
429 mbox->mbx_create_conn_memset = jiffies;
431 mbox->mbx_nallocs_total++;
433 /* zero mbox to remove any old data from our last use.
434 * this better be safe, if not our purgatory timers
435 * are too short or a peer really is misbehaving */
436 memset(smsg_attr->msg_buffer + smsg_attr->mbox_offset,
437 0, smsg_attr->buff_size);
441 spin_unlock(&dev->gnd_fmablk_lock);
445 kgnilnd_setup_mbox(kgn_conn_t *conn)
447 gni_smsg_attr_t *smsg_attr = &conn->gnpr_smsg_attr;
450 smsg_attr->msg_buffer = NULL;
451 /* Look for available mbox */
453 kgnilnd_find_free_mbox(conn);
455 /* nothing in the existing buffers, make a new one */
456 if (smsg_attr->msg_buffer == NULL) {
457 /* for runtime allocations, we only want vmalloc */
458 err = kgnilnd_alloc_fmablk(conn->gnc_device, 0);
463 } while (smsg_attr->msg_buffer == NULL);
466 CNETERR("couldn't allocate SMSG mbox for conn %p Error: %d\n",
472 kgnilnd_release_mbox(kgn_conn_t *conn, int purgatory_hold)
474 kgn_device_t *dev = conn->gnc_device;
475 gni_smsg_attr_t *smsg_attr = &conn->gnpr_smsg_attr;
476 kgn_fma_memblock_t *fma_blk = NULL;
477 kgn_mbox_info_t *mbox = NULL;
481 /* if we failed to setup mbox and now destroying conn */
482 if (smsg_attr->msg_buffer == NULL) {
486 id = conn->gnc_mbox_id;
488 spin_lock(&dev->gnd_fmablk_lock);
489 /* make sure our conn points at a valid fma_blk
490 * We use this instead of a mem block search out of smsg_attr
491 * because we could have freed a block for fma_blk #1 but the fma_blk
492 * is still in the list for a purgatory hold. This would induce a false
493 * match if that same block gets reallocated to fma_blk #2 */
494 list_for_each_entry(fma_blk, &dev->gnd_fma_buffs, gnm_bufflist) {
495 if (fma_blk == conn->gnc_fma_blk) {
500 LASSERTF(found, "unable to find conn 0x%p with gnc_fma_blk %p "
501 "anywhere in the world\n", conn, conn->gnc_fma_blk);
503 LASSERTF(id < fma_blk->gnm_num_mboxs,
504 "bad id %d max %d\n",
505 id, fma_blk->gnm_num_mboxs);
507 /* < 0 - was held, now free it
508 * == 0 - just free it
509 * > 0 - hold it for now */
510 if (purgatory_hold == 0) {
511 CDEBUG(D_NET, "conn %p smsg %p fmablk %p freeing SMSG mbox %d "
512 "hndl %#llx.%#llx\n",
513 conn, smsg_attr, fma_blk, id,
514 fma_blk->gnm_hndl.qword1, fma_blk->gnm_hndl.qword2);
515 fma_blk->gnm_avail_mboxs++;
517 } else if (purgatory_hold > 0) {
518 CDEBUG(D_NET, "conn %p smsg %p fmablk %p holding SMSG mbox %d "
519 "hndl %#llx.%#llx\n",
520 conn, smsg_attr, fma_blk, id,
521 fma_blk->gnm_hndl.qword1, fma_blk->gnm_hndl.qword2);
523 fma_blk->gnm_held_mboxs++;
524 fma_blk->gnm_max_timeout = max_t(long, fma_blk->gnm_max_timeout,
527 CDEBUG(D_NET, "conn %p smsg %p fmablk %p release SMSG mbox %d "
528 "hndl %#llx.%#llx\n",
529 conn, smsg_attr, fma_blk, id,
530 fma_blk->gnm_hndl.qword1, fma_blk->gnm_hndl.qword2);
532 fma_blk->gnm_held_mboxs--;
533 fma_blk->gnm_avail_mboxs++;
536 if (purgatory_hold <= 0) {
537 /* if kgni is retransmitting, freeing the smsg block before the EP
538 * is destroyed gets messy. Bug 768295. */
539 LASSERTF(conn->gnc_ephandle == NULL,
540 "can't release mbox before EP is nuked. conn 0x%p\n", conn);
542 mbox = &fma_blk->gnm_mbox_info[id];
543 mbox->mbx_release_from_purgatory = jiffies;
545 /* clear conn gnc_fmablk if it is gone - this allows us to
546 * not worry about state so much in kgnilnd_destroy_conn
547 * and makes the guaranteed cleanup of the resources easier */
548 LASSERTF(test_and_clear_bit(id, fma_blk->gnm_bit_array),
549 "conn %p bit %d already cleared in fma_blk %p\n",
551 conn->gnc_fma_blk = NULL;
555 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_FMABLK_AVAIL)) {
556 CERROR("LBUGs in your future: forcibly marking fma_blk %p "
557 "as mapped\n", fma_blk);
558 fma_blk->gnm_state = GNILND_FMABLK_VIRT;
561 /* we don't release or unmap PHYS blocks as part of the normal cycle --
562 * those are controlled manually from startup/shutdown */
563 if (fma_blk->gnm_state != GNILND_FMABLK_PHYS) {
564 /* we can unmap once all are unused (held or avail)
565 * but check hold_timeout to make sure we are not trying to double
566 * unmap this buffer. If there was no hold_timeout set due to
567 * held_mboxs, we'll free the mobx here shortly and won't have to
568 * worry about catching a double free for a 'clean' fma_blk */
569 if (((fma_blk->gnm_avail_mboxs + fma_blk->gnm_held_mboxs) == fma_blk->gnm_num_mboxs) &&
570 (!fma_blk->gnm_hold_timeout)) {
571 kgnilnd_unmap_fmablk(dev, fma_blk);
574 /* But we can only free once they are all avail */
575 if (fma_blk->gnm_avail_mboxs == fma_blk->gnm_num_mboxs &&
576 fma_blk->gnm_held_mboxs == 0) {
577 /* all mailboxes are released, free fma_blk */
578 kgnilnd_free_fmablk_locked(dev, fma_blk);
582 spin_unlock(&dev->gnd_fmablk_lock);
586 kgnilnd_count_phys_mbox(kgn_device_t *device)
589 kgn_fma_memblock_t *fma_blk;
591 spin_lock(&device->gnd_fmablk_lock);
593 list_for_each_entry(fma_blk, &device->gnd_fma_buffs, gnm_bufflist) {
594 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS)
595 i += fma_blk->gnm_num_mboxs;
597 spin_unlock(&device->gnd_fmablk_lock);
603 kgnilnd_allocate_phys_fmablk(kgn_device_t *device)
607 while (kgnilnd_count_phys_mbox(device) < *kgnilnd_tunables.kgn_nphys_mbox) {
609 rc = kgnilnd_alloc_fmablk(device, 1);
611 CERROR("failed phys mbox allocation, stopping at %d, rc %d\n",
612 kgnilnd_count_phys_mbox(device), rc);
620 kgnilnd_map_phys_fmablk(kgn_device_t *device)
624 kgn_fma_memblock_t *fma_blk;
626 /* use mutex to gate access to single thread, just in case */
627 mutex_lock(&device->gnd_fmablk_mutex);
629 spin_lock(&device->gnd_fmablk_lock);
631 list_for_each_entry(fma_blk, &device->gnd_fma_buffs, gnm_bufflist) {
632 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS) {
633 rc = kgnilnd_map_fmablk(device, fma_blk);
638 spin_unlock(&device->gnd_fmablk_lock);
640 mutex_unlock(&device->gnd_fmablk_mutex);
646 kgnilnd_unmap_fma_blocks(kgn_device_t *device)
649 kgn_fma_memblock_t *fma_blk;
651 /* use mutex to gate access to single thread, just in case */
652 mutex_lock(&device->gnd_fmablk_mutex);
654 spin_lock(&device->gnd_fmablk_lock);
656 list_for_each_entry(fma_blk, &device->gnd_fma_buffs, gnm_bufflist) {
657 kgnilnd_unmap_fmablk(device, fma_blk);
659 spin_unlock(&device->gnd_fmablk_lock);
661 mutex_unlock(&device->gnd_fmablk_mutex);
665 kgnilnd_free_phys_fmablk(kgn_device_t *device)
668 kgn_fma_memblock_t *fma_blk, *fma_blkN;
670 /* use mutex to gate access to single thread, just in case */
671 mutex_lock(&device->gnd_fmablk_mutex);
673 spin_lock(&device->gnd_fmablk_lock);
675 list_for_each_entry_safe(fma_blk, fma_blkN, &device->gnd_fma_buffs, gnm_bufflist) {
676 if (fma_blk->gnm_state == GNILND_FMABLK_PHYS)
677 kgnilnd_free_fmablk_locked(device, fma_blk);
679 spin_unlock(&device->gnd_fmablk_lock);
681 mutex_unlock(&device->gnd_fmablk_mutex);
684 /* kgnilnd dgram nid->struct managment */
686 static inline struct list_head *
687 kgnilnd_nid2dgramlist(kgn_device_t *dev, lnet_nid_t nid)
689 unsigned int hash = ((unsigned int)nid) % *kgnilnd_tunables.kgn_peer_hash_size;
691 RETURN(&dev->gnd_dgrams[hash]);
695 /* needs dev->gnd_dgram_lock held */
697 kgnilnd_find_dgram_locked(kgn_device_t *dev, lnet_nid_t dst_nid)
699 struct list_head *dgram_list = kgnilnd_nid2dgramlist(dev, dst_nid);
702 list_for_each_entry(dgram, dgram_list, gndg_list) {
704 /* if state > POSTED, we are already handling cancel/completion */
705 if ((dgram->gndg_conn_out.gncr_dstnid != dst_nid) ||
706 dgram->gndg_state > GNILND_DGRAM_POSTED)
709 CDEBUG(D_NET, "got dgram [%p] -> %s\n",
710 dgram, libcfs_nid2str(dst_nid));
717 kgnilnd_find_and_cancel_dgram(kgn_device_t *dev, lnet_nid_t dst_nid)
721 spin_lock(&dev->gnd_dgram_lock);
722 dgram = kgnilnd_find_dgram_locked(dev, dst_nid);
725 kgnilnd_cancel_dgram_locked(dgram);
727 spin_unlock(&dev->gnd_dgram_lock);
729 RETURN(!!(dgram == NULL));
733 kgnilnd_pack_connreq(kgn_connreq_t *connreq, kgn_conn_t *conn,
734 lnet_nid_t srcnid, lnet_nid_t dstnid,
735 kgn_connreq_type_t type)
739 /* ensure we haven't violated max datagram size */
740 BUILD_BUG_ON(sizeof(kgn_connreq_t) > GNI_DATAGRAM_MAXSIZE);
742 /* no need to zero out, we do that when allocating dgram */
743 connreq->gncr_magic = GNILND_MSG_MAGIC;
745 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PACK_SRCNID)) {
747 } else if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PACK_DSTNID)) {
751 connreq->gncr_srcnid = srcnid;
752 connreq->gncr_dstnid = dstnid;
754 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
755 connreq->gncr_version = 99;
757 connreq->gncr_version = GNILND_CONNREQ_VERSION;
759 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
760 connreq->gncr_type = 99;
762 connreq->gncr_type = type;
764 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
765 connreq->gncr_peerstamp = 0;
767 connreq->gncr_peerstamp = kgnilnd_data.kgn_peerstamp;
769 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
770 connreq->gncr_connstamp = 0;
772 connreq->gncr_connstamp = conn->gnc_my_connstamp;
774 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_PROTO)) {
775 connreq->gncr_timeout = 0;
777 connreq->gncr_timeout = conn->gnc_timeout;
780 /* the rest pack the data into the payload in other places */
781 if (type == GNILND_CONNREQ_REQ) {
782 kgn_gniparams_t *req_params = &connreq->gncr_gnparams;
783 req_params->gnpr_host_id = conn->gnc_device->gnd_host_id;
784 req_params->gnpr_cqid = conn->gnc_cqid;
786 /* allocate mailbox for this connection */
787 err = kgnilnd_setup_mbox(conn);
789 CERROR("Failed to setup FMA mailbox (%d)\n", err);
791 req_params->gnpr_smsg_attr = conn->gnpr_smsg_attr;
794 /* XXX Nic: TBD - checksum computation */
800 kgnilnd_unpack_connreq(kgn_dgram_t *dgram)
802 kgn_connreq_t *connreq = &dgram->gndg_conn_in;
806 /* the following fields must be handled in a backwards compatible
807 * manner to ensure we can always send and interpret NAKs */
809 if (connreq->gncr_magic != GNILND_MSG_MAGIC &&
810 connreq->gncr_magic != __swab32(GNILND_MSG_MAGIC)) {
811 /* Unexpected magic! */
812 CERROR("Unexpected magic %08x\n",
813 connreq->gncr_magic);
817 swab = (connreq->gncr_magic == __swab32(GNILND_MSG_MAGIC));
819 __swab32s(&connreq->gncr_magic);
820 __swab32s(&connreq->gncr_cksum);
821 __swab16s(&connreq->gncr_type);
822 __swab16s(&connreq->gncr_version);
823 __swab32s(&connreq->gncr_timeout);
824 __swab64s(&connreq->gncr_srcnid);
825 __swab64s(&connreq->gncr_dstnid);
826 __swab64s(&connreq->gncr_peerstamp);
827 __swab64s(&connreq->gncr_connstamp);
830 /* Do NOT return anything but -EBADF before we munge
831 * connreq->gncr_srcnid - we need that to send the nak */
833 if (dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
834 lnet_nid_t incoming = connreq->gncr_srcnid;
836 /* even if the incoming packet is hosed, we know who we sent
837 * the original and can set the srcnid so that we can properly
838 * look up our peer to close the loop on this connreq. We still use
839 * -EBADF to prevent a NAK - just in case there are issues with
840 * the payload coming from a random spot, etc. */
841 connreq->gncr_srcnid = dgram->gndg_conn_out.gncr_dstnid;
843 if (LNET_NIDADDR(dgram->gndg_conn_out.gncr_dstnid) !=
844 LNET_NIDADDR(incoming)) {
845 /* we got a datagram match for the wrong nid... */
846 CERROR("matched datagram 0x%p with srcnid %s "
847 "(%x), expecting %s (%x)\n",
849 libcfs_nid2str(incoming),
850 LNET_NIDADDR(incoming),
851 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
852 LNET_NIDADDR(dgram->gndg_conn_out.gncr_dstnid));
856 /* if we have a wildcard datagram it should match an
857 * incoming "active" datagram that should have a fully formed
858 * srcnid and dstnid. If we couldn't unpack it, we drop as
859 * corrupted packet, otherwise we'll just verify that the dstnid
860 * matches the NID for the NET that the dgram was posted */
862 /* make sure their wildcard didn't match ours, that is unpossible */
863 LASSERTF(connreq->gncr_dstnid != LNET_NID_ANY,
864 "dgram 0x%p from %s, connreq 0x%p; "
865 "wildcard matched wildcard \n", dgram,
866 libcfs_nid2str(connreq->gncr_srcnid), connreq);
868 rc = kgnilnd_find_net(connreq->gncr_dstnid, &net);
870 if (rc == -ESHUTDOWN) {
871 CERROR("Looking up network: device is in shutdown");
873 } else if (rc == -ENONET) {
874 CERROR("Connection data from %s: she sent "
875 "dst_nid %s, but net lookup failed on "
877 libcfs_nid2str(connreq->gncr_srcnid),
878 libcfs_nid2str(connreq->gncr_dstnid),
879 dgram, kgnilnd_dgram_type2str(dgram));
883 if (net->gnn_ni->ni_nid != connreq->gncr_dstnid) {
884 CERROR("Bad connection data from %s: she sent "
885 "dst_nid %s, but I am %s with dgram 0x%p@%s\n",
886 libcfs_nid2str(connreq->gncr_srcnid),
887 libcfs_nid2str(connreq->gncr_dstnid),
888 libcfs_nid2str(net->gnn_ni->ni_nid),
889 dgram, kgnilnd_dgram_type2str(dgram));
890 kgnilnd_net_decref(net);
894 /* kgnilnd_find_net takes a ref on the net it finds, You need to decref it when not needed. */
895 kgnilnd_net_decref(net);
898 if (connreq->gncr_version != GNILND_CONNREQ_VERSION) {
899 CERROR("Unexpected version %d\n", connreq->gncr_version);
903 /* XXX Nic: TBD - checksum validation */
904 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_CONNREQ_DROP)) {
908 if (swab && connreq->gncr_type == GNILND_CONNREQ_REQ) {
909 __u64 msg_addr = (__u64) connreq->gncr_gnparams.gnpr_smsg_attr.msg_buffer;
911 __swab32s(&connreq->gncr_gnparams.gnpr_host_id);
912 __swab32s(&connreq->gncr_gnparams.gnpr_cqid);
913 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.buff_size);
914 __swab16s(&connreq->gncr_gnparams.gnpr_smsg_attr.mbox_maxcredit);
915 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.mbox_offset);
916 __swab64s(&connreq->gncr_gnparams.gnpr_smsg_attr.mem_hndl.qword1);
917 __swab64s(&connreq->gncr_gnparams.gnpr_smsg_attr.mem_hndl.qword2);
918 __swab64s(&msg_addr);
919 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.msg_maxsize);
920 __swab32s(&connreq->gncr_gnparams.gnpr_smsg_attr.msg_type);
921 } else if (swab && connreq->gncr_type == GNILND_CONNREQ_NAK) {
922 __swab32s(&connreq->gncr_nakdata.gnnd_errno);
925 /* since we use a unique instance ID for each network, the driver
926 * will take care of dropping datagrams if we don't have that network.
929 /* few more idiot software or configuration checks */
931 switch (connreq->gncr_type) {
932 case GNILND_CONNREQ_REQ:
933 /* wire up EP and SMSG block - this will check the incoming data
934 * and barf a NAK back if need to */
935 rc = kgnilnd_set_conn_params(dgram);
939 case GNILND_CONNREQ_NAK:
940 case GNILND_CONNREQ_CLOSE:
943 CERROR("unknown connreq packet type %d\n", connreq->gncr_type);
947 if (connreq->gncr_peerstamp == 0 || connreq->gncr_connstamp == 0) {
948 CERROR("Recived bad timestamps peer %llu conn %llu\n",
949 connreq->gncr_peerstamp, connreq->gncr_connstamp);
953 if (connreq->gncr_timeout < GNILND_MIN_TIMEOUT) {
954 CERROR("Received timeout %d < MIN %d\n",
955 connreq->gncr_timeout, GNILND_MIN_TIMEOUT);
963 kgnilnd_alloc_dgram(kgn_dgram_t **dgramp, kgn_device_t *dev, kgn_dgram_type_t type)
967 dgram = kmem_cache_zalloc(kgnilnd_data.kgn_dgram_cache, GFP_ATOMIC);
971 INIT_LIST_HEAD(&dgram->gndg_list);
972 dgram->gndg_state = GNILND_DGRAM_USED;
973 dgram->gndg_type = type;
974 dgram->gndg_magic = GNILND_DGRAM_MAGIC;
976 atomic_inc(&dev->gnd_ndgrams);
978 CDEBUG(D_MALLOC|D_NETTRACE, "slab-alloced 'dgram': %lu at %p %s ndgrams"
980 sizeof(*dgram), dgram, kgnilnd_dgram_type2str(dgram),
981 atomic_read(&dev->gnd_ndgrams));
987 /* call this on a dgram that came back from kgnilnd_ep_postdata_test_by_id
988 * returns < 0 on dgram to be cleaned up
989 * > 0 on dgram that isn't done yet
990 * == 0 on dgram that is ok and needs connreq processing */
992 kgnilnd_process_dgram(kgn_dgram_t *dgram, gni_post_state_t post_state)
996 switch (post_state) {
997 case GNI_POST_COMPLETED:
998 /* normal state for dgrams that need actual processing */
999 /* GOTO to avoid processing dgram as canceled/done */
1000 GOTO(process_out, rc);
1002 case GNI_POST_PENDING:
1003 /* we should only see this if we are testing a WC dgram after a
1004 * cancel - it means that it needs a full cycle of waiting
1005 * for kgni_sm_task to finish moving it to TERMINATED */
1006 LASSERTF((dgram->gndg_type == GNILND_DGRAM_WC_REQ) &&
1007 (dgram->gndg_state == GNILND_DGRAM_CANCELED),
1008 "POST_PENDING dgram 0x%p with bad type %d(%s) or state %d(%s)\n",
1009 dgram, dgram->gndg_type, kgnilnd_dgram_type2str(dgram),
1010 dgram->gndg_state, kgnilnd_dgram_state2str(dgram));
1012 /* positive RC as this dgram isn't done yet */
1015 /* GOTO as this isn't done yet */
1016 GOTO(process_out, rc);
1019 case GNI_POST_TERMINATED:
1020 /* we've called cancel and it is done or remote guy called cancel and
1021 * we've receved it on a WC dgram */
1023 /* we are seeing weird terminations on non WC dgrams when we have not
1026 LASSERTF(dgram->gndg_state == GNILND_DGRAM_CANCELED ||
1027 dgram->gndg_conn_out.gncr_dstnid == LNET_NID_ANY,
1028 "dgram 0x%p with bad state %d(%s) or dst nid %s\n",
1029 dgram, dgram->gndg_state, kgnilnd_dgram_state2str(dgram),
1030 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid));
1033 CDEBUG(D_NETTRACE, "dgram 0x%p saw %s, cleaning it up\n", dgram,
1034 dgram->gndg_state == GNILND_DGRAM_CANCELED ? "canceled" : "terminated");
1039 case GNI_POST_TIMEOUT:
1040 /* we could have a timeout on a wildcard dgram too - if
1041 * we got the incoming request but the remote node beefed
1042 * before kgni could send the match data back. We'll just error
1043 * on the active case and bail out gracefully */
1044 if (dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
1045 CNETERR("hardware timeout for connect to "
1046 "%s after %lu seconds. Is node dead?\n",
1047 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
1048 cfs_duration_sec(jiffies - dgram->gndg_post_time));
1055 CERROR("dgram 0x%p with bad post_state %d\n", dgram, post_state);
1059 /* now finish cleaning up a dgram that is canceled/terminated and needs to
1062 /* If this was actively canceled, drop the count now that we are processing */
1063 if (dgram->gndg_state == GNILND_DGRAM_CANCELED) {
1064 atomic_dec(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1065 /* caller responsible for gndg_list removal */
1073 /* needs dev->gnd_dgram_lock held */
1075 kgnilnd_cancel_dgram_locked(kgn_dgram_t *dgram)
1079 if (dgram->gndg_state != GNILND_DGRAM_POSTED) {
1083 LASSERTF(dgram->gndg_conn != NULL,
1084 "dgram 0x%p with NULL conn\n", dgram);
1086 /* C.E - WC dgrams could be canceled immediately but
1087 * if there was some match pending, we need to call
1088 * test_by_id to clear it out. If that test returns
1089 * POST_PENDING, it is half done and needs to go along
1090 * with the rest of dgrams and go through a kgni_sm_task cycle
1091 * and deliver a GNI_POST_TERMINATED event before they
1092 * are actually canceled */
1094 dgram->gndg_state = GNILND_DGRAM_CANCELED;
1096 if (dgram->gndg_conn->gnc_state >= GNILND_CONN_ESTABLISHED) {
1097 /* we don't need to cancel_by_id if the datagram was good */
1101 /* let folks know there are outstanding cancels */
1102 atomic_inc(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1103 /* leave on nid list until cancel is done for debugging fun */
1104 grc = kgnilnd_ep_postdata_cancel_by_id(dgram->gndg_conn->gnc_ephandle, (__u64) dgram);
1106 /* if we don't get success here, we have hosed up the dgram tracking
1107 * code and need to bail out */
1108 LASSERTF(grc == GNI_RC_SUCCESS,
1109 "postdata_cancel returned %d for conn 0x%p to %s\n",
1110 grc, dgram->gndg_conn,
1111 dgram->gndg_conn->gnc_peer ?
1112 libcfs_nid2str(dgram->gndg_conn->gnc_peer->gnp_nid)
1116 "canceled dgram 0x%p conn 0x%p ephandle 0x%p\n",
1117 dgram, dgram->gndg_conn,
1118 dgram->gndg_conn->gnc_ephandle);
1120 if (dgram->gndg_type == GNILND_DGRAM_WC_REQ) {
1121 gni_post_state_t post_state;
1123 __u32 remote_addr = 0, remote_id = 0;
1125 grc = kgnilnd_ep_postdata_test_by_id(dgram->gndg_conn->gnc_ephandle,
1126 (__u64)dgram, &post_state,
1127 &remote_addr, &remote_id);
1129 LASSERTF(grc == GNI_RC_NO_MATCH || grc == GNI_RC_SUCCESS,
1130 "bad grc %d from test_by_id on dgram 0x%p\n",
1133 /* if WC was canceled immediately, we get NO_MATCH, if needs to go
1134 * through full cycle, we get SUCCESS and need to parse post_state */
1136 CDEBUG(D_NET, "grc %d dgram 0x%p type %s post_state %d "
1137 "remote_addr %u remote_id %u\n", grc, dgram,
1138 kgnilnd_dgram_type2str(dgram),
1139 post_state, remote_addr, remote_id);
1141 if (grc == GNI_RC_NO_MATCH) {
1142 /* she's gone, reduce count and move along */
1143 dgram->gndg_state = GNILND_DGRAM_DONE;
1144 atomic_dec(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1148 rc = kgnilnd_process_dgram(dgram, post_state);
1151 /* if for some weird reason we get a valid dgram back, just mark as done
1152 * so we can drop it and move along.
1153 * C.E - if it was completed, we'll just release the conn/mbox
1154 * back into the pool and it'll get reused. That said, we should only
1155 * be canceling a WC dgram on stack rest or shutdown, so that is moot */
1156 dgram->gndg_state = GNILND_DGRAM_DONE;
1157 atomic_dec(&dgram->gndg_conn->gnc_device->gnd_canceled_dgrams);
1159 /* caller context responsible for calling kgnilnd_release_dgram() */
1161 /* still pending, let it simmer until golden brown and delicious */
1165 /* for non WC dgrams, they are still on the nid list but marked canceled waiting
1166 * for kgni to return their ID to us via probe - that is when we'll complete their
1167 * cancel processing */
1171 kgnilnd_cleanup_dgram(kgn_dgram_t *dgram)
1173 /* release the dgram ref on conn */
1174 if (dgram->gndg_conn) {
1175 kgnilnd_conn_decref(dgram->gndg_conn);
1176 dgram->gndg_conn = NULL;
1181 kgnilnd_free_dgram(kgn_device_t *dev, kgn_dgram_t *dgram)
1183 LASSERTF(dgram->gndg_state == GNILND_DGRAM_USED ||
1184 dgram->gndg_state == GNILND_DGRAM_DONE,
1185 "dgram 0x%p with bad state %s\n",
1186 dgram, kgnilnd_dgram_state2str(dgram));
1188 /* bit of poisoning to help detect bad driver data */
1189 dgram->gndg_magic = 0x6f5a6b5f;
1190 atomic_dec(&dev->gnd_ndgrams);
1192 kmem_cache_free(kgnilnd_data.kgn_dgram_cache, dgram);
1193 CDEBUG(D_MALLOC|D_NETTRACE, "slab-freed 'dgram': %lu at %p %s"
1195 sizeof(*dgram), dgram, kgnilnd_dgram_type2str(dgram),
1196 atomic_read(&dev->gnd_ndgrams));
1200 kgnilnd_post_dgram(kgn_device_t *dev, lnet_nid_t dstnid, kgn_connreq_type_t type,
1204 kgn_dgram_t *dgram = NULL;
1205 kgn_dgram_t *tmpdgram;
1206 kgn_dgram_type_t dgtype;
1212 case GNILND_CONNREQ_REQ:
1213 if (dstnid == LNET_NID_ANY)
1214 dgtype = GNILND_DGRAM_WC_REQ;
1216 dgtype = GNILND_DGRAM_REQ;
1218 case GNILND_CONNREQ_NAK:
1219 LASSERTF(dstnid != LNET_NID_ANY, "can't NAK to LNET_NID_ANY\n");
1220 dgtype = GNILND_DGRAM_NAK;
1223 CERROR("unknown connreq type %d\n", type);
1227 rc = kgnilnd_alloc_dgram(&dgram, dev, dgtype);
1230 GOTO(post_failed, rc);
1233 rc = kgnilnd_create_conn(&dgram->gndg_conn, dev);
1235 GOTO(post_failed, rc);
1238 if (dgram->gndg_type == GNILND_DGRAM_WC_REQ) {
1239 /* clear buffer for sanity on reuse of wildcard */
1240 memset(&dgram->gndg_conn_in, 0, sizeof(kgn_connreq_t));
1243 if (dstnid == LNET_NID_ANY) {
1244 /* set here to reset any dgram re-use */
1245 dgram->gndg_conn->gnc_state = GNILND_CONN_LISTEN;
1249 rc = kgnilnd_nid_to_nicaddrs(LNET_NIDADDR(dstnid), 1, &host_id);
1252 GOTO(post_failed, rc);
1255 dgram->gndg_conn->gnc_state = GNILND_CONN_CONNECTING;
1257 /* don't need to serialize, there are no CQs for the dgram
1258 * EP on the kgn_net_t */
1259 grc = kgnilnd_ep_bind(dgram->gndg_conn->gnc_ephandle, host_id, dev->gnd_id);
1261 if (grc != GNI_RC_SUCCESS) {
1263 GOTO(post_failed, rc);
1268 /* If we are posting wildcards post using a net of 0, otherwise we'll use the
1269 * net of the destination node.
1272 if (dstnid == LNET_NID_ANY) {
1273 srcnid = LNET_MKNID(LNET_MKNET(GNILND, 0), dev->gnd_nid);
1275 srcnid = LNET_MKNID(LNET_NIDNET(dstnid), dev->gnd_nid);
1278 rc = kgnilnd_pack_connreq(&dgram->gndg_conn_out, dgram->gndg_conn,
1279 srcnid, dstnid, type);
1281 GOTO(post_failed, rc);
1284 if (type == GNILND_CONNREQ_NAK)
1285 dgram->gndg_conn_out.gncr_nakdata.gnnd_errno = data_rc;
1287 dgram->gndg_post_time = jiffies;
1289 /* XXX Nic: here is where we'd add in logical network multiplexing */
1291 CDEBUG(D_NETTRACE, "dgram 0x%p type %s %s->%s cdm %d\n",
1292 dgram, kgnilnd_dgram_type2str(dgram),
1293 libcfs_nid2str(srcnid),
1294 libcfs_nid2str(dstnid), dev->gnd_id);
1296 /* this allocates memory, can't hold locks across */
1297 grc = kgnilnd_ep_postdata_w_id(dgram->gndg_conn->gnc_ephandle,
1298 &dgram->gndg_conn_out, sizeof(kgn_connreq_t),
1299 &dgram->gndg_conn_in, sizeof(kgn_connreq_t),
1302 if (grc != GNI_RC_SUCCESS) {
1303 CNETERR("dropping failed dgram post id 0x%p type %s"
1304 " reqtype %s to %s: rc %d\n",
1305 dgram, kgnilnd_dgram_type2str(dgram),
1306 kgnilnd_connreq_type2str(&dgram->gndg_conn_out),
1307 libcfs_nid2str(dstnid), grc);
1308 rc = (grc == GNI_RC_ERROR_NOMEM) ? -ENOMEM : -EBADR;
1309 GOTO(post_failed, rc);
1312 /* we don't need to add earlier - if someone does del_peer during post,
1313 * that peer will get marked as unlinked and the callers wil take care of it.
1314 * The dgram code is largely kgn_peer_t ignorant, so at worst, we'll just drop
1315 * the completed dgram later when we cant find a peer to stuff it into */
1317 spin_lock(&dev->gnd_dgram_lock);
1319 /* make sure we are not double posting targeted dgrams
1320 * - we can multiple post WC dgrams to help with processing speed */
1321 if (dstnid != LNET_NID_ANY) {
1322 tmpdgram = kgnilnd_find_dgram_locked(dev, dstnid);
1324 LASSERTF(tmpdgram == NULL,
1325 "dgram 0x%p->%s already posted\n",
1326 dgram, libcfs_nid2str(dstnid));
1329 /* unmunge dstnid to help processing code cope... */
1330 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PACK_DSTNID)) {
1331 dgram->gndg_conn_out.gncr_dstnid = dstnid;
1334 list_add_tail(&dgram->gndg_list, kgnilnd_nid2dgramlist(dev, dstnid));
1335 dgram->gndg_state = GNILND_DGRAM_POSTED;
1336 spin_unlock(&dev->gnd_dgram_lock);
1339 if (rc < 0 && dgram != NULL) {
1340 kgnilnd_cleanup_dgram(dgram);
1341 kgnilnd_free_dgram(dev, dgram);
1347 /* The shutdown flag is set from the shutdown and stack reset threads. */
1349 kgnilnd_release_dgram(kgn_device_t *dev, kgn_dgram_t *dgram, int shutdown)
1351 /* The conns of canceled active dgrams need to be put in purgatory so
1352 * we don't reuse the mailbox */
1353 if (unlikely(dgram->gndg_state == GNILND_DGRAM_CANCELED)) {
1355 kgn_conn_t *conn = dgram->gndg_conn;
1356 lnet_nid_t nid = dgram->gndg_conn_out.gncr_dstnid;
1358 dgram->gndg_state = GNILND_DGRAM_DONE;
1360 /* During shutdown we've already removed the peer so we don't
1361 * need to add a peer. During stack reset we don't care about
1362 * MDDs since they are all released. */
1364 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1365 peer = kgnilnd_find_peer_locked(nid);
1368 CDEBUG(D_NET, "adding peer's conn with nid %s "
1369 "to purgatory\n", libcfs_nid2str(nid));
1370 kgnilnd_conn_addref(conn);
1371 conn->gnc_peer = peer;
1372 kgnilnd_peer_addref(peer);
1373 kgnilnd_admin_addref(conn->gnc_peer->gnp_dirty_eps);
1374 conn->gnc_state = GNILND_CONN_CLOSED;
1375 list_add_tail(&conn->gnc_list,
1377 kgnilnd_add_purgatory_locked(conn,
1379 kgnilnd_schedule_conn(conn);
1381 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1385 spin_lock(&dev->gnd_dgram_lock);
1386 kgnilnd_cancel_dgram_locked(dgram);
1387 spin_unlock(&dev->gnd_dgram_lock);
1389 kgnilnd_cleanup_dgram(dgram);
1391 /* if the dgram is 'canceled' it needs to be wait until the event
1392 * comes up from kgni that tells us it is safe to release */
1393 if (dgram->gndg_state != GNILND_DGRAM_CANCELED) {
1394 dgram->gndg_state = GNILND_DGRAM_DONE;
1396 LASSERTF(list_empty(&dgram->gndg_list), "dgram 0x%p on list\n", dgram);
1398 /* if it is a wildcard and we are in an appropriate state, repost
1401 if ((dgram->gndg_type == GNILND_DGRAM_WC_REQ) &&
1402 (!kgnilnd_data.kgn_wc_kill && !kgnilnd_data.kgn_in_reset)) {
1405 rerc = kgnilnd_post_dgram(dev, LNET_NID_ANY, GNILND_CONNREQ_REQ, 0);
1407 /* We failed to repost the WC dgram for some reason
1408 * mark it so the repost system attempts to repost */
1409 kgnilnd_admin_addref(dev->gnd_nwcdgrams);
1413 /* always free the old dgram */
1414 kgnilnd_free_dgram(dev, dgram);
1420 kgnilnd_probe_for_dgram(kgn_device_t *dev, kgn_dgram_t **dgramp)
1422 kgn_dgram_t *dgram = NULL;
1423 gni_post_state_t post_state;
1427 __u32 remote_addr = 0, remote_id = 0;
1430 /* Probe with the lock held. That way if we get a dgram we dont have it canceled
1431 * between finding the ready dgram and grabbing the lock to remove it from the
1432 * list. Otherwise we could be left in an inconsistent state. We own the dgram
1433 * once its off the list so we don't need to worry about others changing it at
1435 spin_lock(&dev->gnd_dgram_lock);
1436 grc = kgnilnd_postdata_probe_by_id(dev->gnd_handle, &readyid);
1437 if (grc != GNI_RC_SUCCESS) {
1438 spin_unlock(&dev->gnd_dgram_lock);
1439 /* return 0 to indicate nothing happened */
1443 CDEBUG(D_NET, "ready %#llx on device 0x%p\n",
1446 dgram = (kgn_dgram_t *)readyid;
1448 LASSERTF(dgram->gndg_magic == GNILND_DGRAM_MAGIC,
1449 "dgram 0x%p from id %#llx with bad magic %x\n",
1450 dgram, readyid, dgram->gndg_magic);
1452 LASSERTF(dgram->gndg_state == GNILND_DGRAM_POSTED ||
1453 dgram->gndg_state == GNILND_DGRAM_CANCELED,
1454 "dgram 0x%p with bad state %s\n",
1455 dgram, kgnilnd_dgram_state2str(dgram));
1457 LASSERTF(!list_empty(&dgram->gndg_list),
1458 "dgram 0x%p with bad list state %s type %s\n",
1459 dgram, kgnilnd_dgram_state2str(dgram),
1460 kgnilnd_dgram_type2str(dgram));
1462 /* now we know that the datagram structure is ok, so pull off list */
1463 list_del_init(&dgram->gndg_list);
1465 /* while we have the gnn_dgram_lock and BEFORE we call test_by_id
1466 * change the state from POSTED to PROCESSING to ensure that
1467 * nobody cancels it after we've pulled it from the wire */
1468 if (dgram->gndg_state == GNILND_DGRAM_POSTED) {
1469 dgram->gndg_state = GNILND_DGRAM_PROCESSING;
1472 LASSERTF(dgram->gndg_conn != NULL,
1473 "dgram 0x%p with NULL conn\n", dgram);
1475 grc = kgnilnd_ep_postdata_test_by_id(dgram->gndg_conn->gnc_ephandle,
1476 (__u64)dgram, &post_state,
1477 &remote_addr, &remote_id);
1479 /* we now "own" this datagram */
1480 spin_unlock(&dev->gnd_dgram_lock);
1482 LASSERTF(grc != GNI_RC_NO_MATCH, "kgni lied! probe_by_id told us that"
1483 " id %llu was ready\n", readyid);
1485 CDEBUG(D_NET, "grc %d dgram 0x%p type %s post_state %d "
1486 "remote_addr %u remote_id %u\n", grc, dgram,
1487 kgnilnd_dgram_type2str(dgram),
1488 post_state, remote_addr, remote_id);
1490 if (unlikely(grc != GNI_RC_SUCCESS)) {
1491 CNETERR("getting data for dgram 0x%p->%s failed rc %d. Dropping it\n",
1492 dgram, libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
1495 GOTO(probe_for_out, rc);
1498 rc = kgnilnd_process_dgram(dgram, post_state);
1500 /* we should never get probe finding a dgram for us and then it
1501 * being a WC dgram that is still in the middle of processing */
1502 LASSERTF(rc <= 0, "bad rc %d from process_dgram 0x%p state %d\n",
1503 rc, dgram, post_state);
1506 /* dgram is good enough for the data to be used */
1507 dgram->gndg_state = GNILND_DGRAM_PROCESSING;
1508 /* fake rc to mark that we've done something */
1511 /* let kgnilnd_release_dgram take care of canceled dgrams */
1512 if (dgram->gndg_state != GNILND_DGRAM_CANCELED) {
1513 dgram->gndg_state = GNILND_DGRAM_DONE;
1522 kgnilnd_release_dgram(dev, dgram, 0);
1527 kgnilnd_setup_wildcard_dgram(kgn_device_t *dev)
1529 /* if kgn_wildcard is zero, return error */
1530 int rc = -ENOENT, i;
1533 for (i = 0; i < *kgnilnd_tunables.kgn_nwildcard; i++) {
1534 rc = kgnilnd_post_dgram(dev, LNET_NID_ANY, GNILND_CONNREQ_REQ, 0);
1536 CERROR("error %d: could not post wildcard datagram # %d\n",
1548 kgnilnd_cancel_net_dgrams(kgn_net_t *net)
1550 kgn_dgram_t *dg, *dgN;
1555 /* we want to cancel any outstanding dgrams - we don't want to rely
1556 * on del_peer_or_conn catching all of them. This helps protect us in cases
1557 * where we don't quite keep the peer->dgram mapping in sync due to some
1558 * race conditions */
1560 LASSERTF(net->gnn_shutdown || kgnilnd_data.kgn_in_reset,
1561 "called with LND invalid state: net shutdown %d "
1562 "in reset %d\n", net->gnn_shutdown,
1563 kgnilnd_data.kgn_in_reset);
1565 spin_lock(&net->gnn_dev->gnd_dgram_lock);
1567 for (i = 0; i < *kgnilnd_tunables.kgn_peer_hash_size; i++) {
1568 list_for_each_entry_safe(dg, dgN, &net->gnn_dev->gnd_dgrams[i], gndg_list) {
1570 /* skip nids not on our net or are wildcards */
1573 if (dg->gndg_type == GNILND_DGRAM_WC_REQ ||
1574 net->gnn_netnum != LNET_NETNUM(LNET_NIDNET(dg->gndg_conn_out.gncr_dstnid)))
1577 kgnilnd_cancel_dgram_locked(dg);
1581 spin_unlock(&net->gnn_dev->gnd_dgram_lock);
1587 kgnilnd_cancel_wc_dgrams(kgn_device_t *dev)
1589 kgn_dgram_t *dg, *dgN;
1593 /* Time to kill the outstanding WC's
1594 * WC's exist on net 0 only but match on any net...
1597 LASSERTF(kgnilnd_data.kgn_in_reset || kgnilnd_data.kgn_wc_kill,
1598 "called with LND invalid state: WC shutdown %d "
1599 "in reset %d\n", kgnilnd_data.kgn_wc_kill,
1600 kgnilnd_data.kgn_in_reset);
1602 spin_lock(&dev->gnd_dgram_lock);
1605 dg = kgnilnd_find_dgram_locked(dev, LNET_NID_ANY);
1607 LASSERTF(dg->gndg_type == GNILND_DGRAM_WC_REQ,
1608 "dgram 0x%p->%s with bad type %d (%s)\n",
1609 dg, libcfs_nid2str(dg->gndg_conn_out.gncr_dstnid),
1610 dg->gndg_type, kgnilnd_dgram_type2str(dg));
1612 kgnilnd_cancel_dgram_locked(dg);
1614 /* WC could be DONE already, check and if so add to list to be released */
1615 if (dg->gndg_state == GNILND_DGRAM_DONE)
1616 list_move_tail(&dg->gndg_list, &zombies);
1618 } while (dg != NULL);
1620 spin_unlock(&dev->gnd_dgram_lock);
1622 list_for_each_entry_safe(dg, dgN, &zombies, gndg_list) {
1623 list_del_init(&dg->gndg_list);
1624 kgnilnd_release_dgram(dev, dg, 1);
1631 kgnilnd_cancel_dgrams(kgn_device_t *dev)
1633 kgn_dgram_t *dg, *dgN;
1637 /* Cancel any outstanding non wildcard datagrams regardless
1638 * of which net they are on as we are in base shutdown and
1639 * dont care about connecting anymore.
1642 LASSERTF(kgnilnd_data.kgn_wc_kill == 1,"We didnt get called from base shutdown\n");
1644 spin_lock(&dev->gnd_dgram_lock);
1646 for (i = 0; i < (*kgnilnd_tunables.kgn_peer_hash_size -1); i++) {
1647 list_for_each_entry_safe(dg, dgN, &dev->gnd_dgrams[i], gndg_list) {
1648 if (dg->gndg_type != GNILND_DGRAM_WC_REQ)
1649 kgnilnd_cancel_dgram_locked(dg);
1653 spin_unlock(&dev->gnd_dgram_lock);
1660 kgnilnd_wait_for_canceled_dgrams(kgn_device_t *dev)
1668 /* use do while to get at least one check run to allow
1669 * regression test for 762072 to hit bug if there */
1671 /* This function races with the dgram mover during shutdown so it is possible for
1672 * a dgram to be seen in kgnilnd_postdata_probe_wait_by_id but be handled in the
1673 * dgram mover thread instead of inside of this function.
1676 /* This should only be called from within shutdown, baseshutdown, or stack reset.
1677 * there are no assertions here to verify since base_shutdown has nothing in it we can check
1678 * the net is gone by then.
1683 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
1684 "Waiting for %d canceled datagrams to clear on device %d\n",
1685 atomic_read(&dev->gnd_canceled_dgrams), dev->gnd_id);
1687 /* check once a second */
1688 grc = kgnilnd_postdata_probe_wait_by_id(dev->gnd_handle,
1691 if (grc != GNI_RC_SUCCESS)
1694 CDEBUG(D_NET, "ready %#llx on device %d->0x%p\n",
1695 readyid, dev->gnd_id, dev);
1697 rc = kgnilnd_probe_for_dgram(dev, &dgram);
1699 /* if we got a valid dgram or one that is now done, clean up */
1700 kgnilnd_release_dgram(dev, dgram, 1);
1702 } while (atomic_read(&dev->gnd_canceled_dgrams));
1706 kgnilnd_start_connect(kgn_peer_t *peer)
1709 /* sync point for kgnilnd_del_peer_locked - do an early check to
1710 * catch the most common hits where del_peer is done by the
1711 * time we get here */
1712 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GNP_CONNECTING1)) {
1713 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_GNP_CONNECTING1, 1)) {};
1716 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1717 if (!kgnilnd_peer_active(peer) || peer->gnp_connecting != GNILND_PEER_CONNECT) {
1718 /* raced with peer getting unlinked */
1719 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1723 peer->gnp_connecting = GNILND_PEER_POSTING;
1724 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1726 set_mb(peer->gnp_last_dgram_time, jiffies);
1727 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GNP_CONNECTING2)) {
1728 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_GNP_CONNECTING2, 1)) {};
1731 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_GNP_CONNECTING3)) {
1732 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_GNP_CONNECTING3, 1)) {};
1733 rc = cfs_fail_val ? cfs_fail_val : -ENOMEM;
1735 rc = kgnilnd_post_dgram(peer->gnp_net->gnn_dev,
1736 peer->gnp_nid, GNILND_CONNREQ_REQ, 0);
1739 set_mb(peer->gnp_last_dgram_errno, rc);
1743 /* while we're posting someone could have decided this peer/dgram needed to
1744 * die a quick death, so we check for state change and process accordingly */
1746 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1747 if (!kgnilnd_peer_active(peer) || peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1748 if (peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH) {
1749 peer->gnp_connecting = GNILND_PEER_KILL;
1751 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1752 /* positive RC to avoid dgram cleanup - we'll have to
1753 * wait for the kgni GNI_POST_TERMINATED event to
1754 * finish cleaning up */
1756 kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev, peer->gnp_nid);
1759 peer->gnp_connecting = GNILND_PEER_POSTED;
1760 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1761 /* reaper thread will take care of any timeouts */
1762 CDEBUG(D_NET, "waiting for connect to finish to %s rc %d\n",
1763 libcfs_nid2str(peer->gnp_nid), rc);
1768 CDEBUG(D_NET, "connect to %s failed: rc %d \n",
1769 libcfs_nid2str(peer->gnp_nid), rc);
1775 kgnilnd_finish_connect(kgn_dgram_t *dgram)
1777 kgn_conn_t *conn = dgram->gndg_conn;
1778 lnet_nid_t her_nid = dgram->gndg_conn_in.gncr_srcnid;
1779 kgn_peer_t *new_peer, *peer = NULL;
1782 kgn_mbox_info_t *mbox;
1786 /* try to find a peer that matches the nid we got in the connreq
1787 * kgnilnd_unpack_connreq makes sure that conn_in.gncr_srcnid is
1788 * HER and conn_out.gncr_srcnid is ME for both active and WC dgrams */
1790 /* assume this is a new peer - it makes locking cleaner when it isn't */
1791 /* no holding kgn_net_rw_sem - already are at the kgnilnd_dgram_mover level */
1793 rc = kgnilnd_create_peer_safe(&new_peer, her_nid, NULL, GNILND_PEER_UP);
1795 CERROR("Can't create peer for %s\n", libcfs_nid2str(her_nid));
1799 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1801 /* this transfers ref from create_peer to the kgn_peer table */
1802 kgnilnd_add_peer_locked(her_nid, new_peer, &peer);
1804 /* if we found an existing peer, is it really ready for a new conn ? */
1805 if (peer != new_peer) {
1806 /* if this was an active connect attempt but we can't find a peer waiting for it
1807 * we will dump in the trash */
1809 if (peer->gnp_connecting == GNILND_PEER_IDLE && dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
1810 CDEBUG(D_NET, "dropping completed connreq for %s peer 0x%p->%s\n",
1811 libcfs_nid2str(her_nid), peer, libcfs_nid2str(peer->gnp_nid));
1812 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1817 /* check to see if we can catch a connecting peer before it is
1818 * removed from the connd_peers list - if not, we need to
1819 * let the connreqs race and be handled by kgnilnd_conn_isdup_locked() */
1820 if (peer->gnp_connecting != GNILND_PEER_IDLE) {
1821 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1822 if (!list_empty(&peer->gnp_connd_list)) {
1823 list_del_init(&peer->gnp_connd_list);
1824 /* drop connd ref */
1825 kgnilnd_peer_decref(peer);
1827 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
1828 /* clear rc to make sure we don't have fake error */
1832 /* no matter what, we are no longer waiting to connect this peer now */
1833 peer->gnp_connecting = GNILND_PEER_IDLE;
1835 /* Refuse to duplicate an existing connection (both sides might try to
1836 * connect at once). NB we return success! We _are_ connected so we
1837 * _don't_ have any blocked txs to complete with failure. */
1838 rc = kgnilnd_conn_isdup_locked(peer, conn);
1840 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1841 CDEBUG(D_NET, "Not creating duplicate connection to %s: %d\n",
1842 libcfs_nid2str(her_nid), rc);
1848 if (peer->gnp_state == GNILND_PEER_DOWN) {
1849 CNETERR("Received connection request from down nid %s\n",
1850 libcfs_nid2str(her_nid));
1853 peer->gnp_state = GNILND_PEER_UP;
1854 nstale = kgnilnd_close_stale_conns_locked(peer, conn);
1856 /* either way with peer (new or existing), we are ok with ref counts here as the
1857 * kgnilnd_add_peer_locked will use our ref on new_peer (from create_peer_safe) as the
1858 * ref for the peer table. */
1860 /* at this point, the connection request is a winner */
1862 /* mark 'DONE' to avoid cancel being called from release */
1863 dgram->gndg_state = GNILND_DGRAM_DONE;
1865 /* initialise timestamps before reaper looks at them */
1866 conn->gnc_last_rx = conn->gnc_last_rx_cq = jiffies;
1868 /* last_tx is initialized to jiffies - (keepalive*2) so that if the NOOP fails it will
1869 * immediatly send a NOOP in the reaper thread during the call to
1870 * kgnilnd_check_conn_timeouts_locked
1872 conn->gnc_last_tx = jiffies - (cfs_time_seconds(GNILND_TO2KA(conn->gnc_timeout)) * 2);
1873 conn->gnc_state = GNILND_CONN_ESTABLISHED;
1875 /* save the dgram type used to establish this connection */
1876 conn->gnc_dgram_type = dgram->gndg_type;
1878 /* refs are not transferred from dgram to tables, so increment to
1880 kgnilnd_conn_addref(conn);
1881 kgnilnd_peer_addref(peer);
1882 conn->gnc_peer = peer;
1883 list_add_tail(&conn->gnc_list, &peer->gnp_conns);
1885 kgnilnd_conn_addref(conn); /* +1 ref for conn table */
1886 list_add_tail(&conn->gnc_hashlist,
1887 kgnilnd_cqid2connlist(conn->gnc_cqid));
1888 kgnilnd_data.kgn_conn_version++;
1890 /* Dont send NOOP if fail_loc is set
1892 if (!CFS_FAIL_CHECK(CFS_FAIL_GNI_ONLY_NOOP)) {
1893 tx = kgnilnd_new_tx_msg(GNILND_MSG_NOOP, peer->gnp_net->gnn_ni->ni_nid);
1895 CNETERR("can't get TX to initiate NOOP to %s\n",
1896 libcfs_nid2str(peer->gnp_nid));
1898 kgnilnd_queue_tx(conn, tx);
1902 /* Schedule all packets blocking for a connection */
1903 list_for_each_entry_safe(tx, txn, &peer->gnp_tx_queue, tx_list) {
1904 /* lock held here is the peer_conn lock */
1905 kgnilnd_tx_del_state_locked(tx, peer, NULL, GNILND_TX_ALLOCD);
1906 kgnilnd_queue_tx(conn, tx);
1909 /* If this is an active connection lets mark its timestamp on the MBoX */
1910 if (dgram->gndg_conn_out.gncr_dstnid != LNET_NID_ANY) {
1911 mbox = &conn->gnc_fma_blk->gnm_mbox_info[conn->gnc_mbox_id];
1912 /* conn->gnc_last_rx is jiffies it better exist as it was just set */
1913 mbox->mbx_release_purg_active_dgram = conn->gnc_last_rx;
1916 /* Bug 765042: wake up scheduler for a race with finish_connect and
1917 * complete_conn_closed with a conn in purgatory
1918 * since we can't use CFS_RACE due to mutex_holds in kgnilnd_process_conns,
1919 * we just check for set and then clear */
1920 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_FINISH_PURG)) {
1922 /* get scheduler thread moving again */
1923 kgnilnd_schedule_device(conn->gnc_device);
1926 CDEBUG(D_NET, "New conn 0x%p->%s dev %d\n",
1927 conn, libcfs_nid2str(her_nid), conn->gnc_device->gnd_id);
1929 /* make sure we reset peer reconnect interval now that we have a good conn */
1930 kgnilnd_peer_alive(peer);
1931 peer->gnp_reconnect_interval = 0;
1933 /* clear the unlink attribute if we dont clear it kgnilnd_del_conn_or_peer will wait
1934 * on the atomic forever
1936 if (peer->gnp_pending_unlink) {
1937 peer->gnp_pending_unlink = 0;
1938 kgnilnd_admin_decref(kgnilnd_data.kgn_npending_unlink);
1939 CDEBUG(D_NET, "Clearing peer unlink %p\n",peer);
1942 /* add ref to make it hang around until after we drop the lock */
1943 kgnilnd_conn_addref(conn);
1945 /* Once the peer_conn lock is dropped, the conn could actually move into
1946 * CLOSING->CLOSED->DONE in the scheduler thread, so hold the
1947 * lock until we are really done */
1948 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
1950 /* Notify LNET that we now have a working connection to this peer.
1951 * This is a Cray extension to the "standard" LND behavior.
1953 lnet_notify(peer->gnp_net->gnn_ni, peer->gnp_nid, true, true,
1954 ktime_get_seconds());
1956 /* drop our 'hold' ref */
1957 kgnilnd_conn_decref(conn);
1964 kgnilnd_send_nak(kgn_device_t *dev, lnet_nid_t dst_nid, int error)
1969 LASSERTF(dst_nid != LNET_NID_ANY, "bad dst_nid %s\n", libcfs_nid2str(dst_nid));
1971 CDEBUG(D_NET, "NAK to %s errno %d\n", libcfs_nid2str(dst_nid), error);
1973 rc = kgnilnd_post_dgram(dev, dst_nid, GNILND_CONNREQ_NAK, error);
1976 CDEBUG(D_NET, "NAK to %s failed: rc %d \n", libcfs_nid2str(dst_nid), rc);
1982 kgnilnd_process_nak(kgn_dgram_t *dgram)
1984 kgn_connreq_t *connreq = &dgram->gndg_conn_in;
1985 lnet_nid_t src_nid = connreq->gncr_srcnid;
1986 int errno = connreq->gncr_nakdata.gnnd_errno;
1990 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
1992 peer = kgnilnd_find_peer_locked(src_nid);
1994 /* we likely dropped him from bad data when we processed
1995 * the original REQ */
1996 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2000 /* need to check peerstamp/connstamp against the ones we find
2001 * to make sure we don't close new (and good?) conns that we
2002 * formed after this connreq failed */
2003 if (peer->gnp_connecting == GNILND_PEER_IDLE) {
2006 if (list_empty(&peer->gnp_conns)) {
2007 /* assume already procced datagram and it barfed up
2008 * on this side too */
2009 CDEBUG(D_NET, "dropping NAK from %s; "
2010 "peer %s is already not connected\n",
2011 libcfs_nid2str(connreq->gncr_srcnid),
2012 libcfs_nid2str(connreq->gncr_dstnid));
2013 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2017 /* stub up a connection with the connreq XXX_stamps to allow
2018 * use to use close_stale_conns_locked */
2019 conn.gnc_peerstamp = connreq->gncr_peerstamp;
2020 conn.gnc_my_connstamp = connreq->gncr_connstamp;
2021 conn.gnc_peer_connstamp = connreq->gncr_connstamp;
2022 conn.gnc_device = peer->gnp_net->gnn_dev;
2024 rc = kgnilnd_close_stale_conns_locked(peer, &conn);
2026 LCONSOLE_INFO("Received NAK from %s for %s errno %d; "
2027 "closed %d connections\n",
2028 libcfs_nid2str(connreq->gncr_srcnid),
2029 libcfs_nid2str(connreq->gncr_dstnid), errno, rc);
2031 spin_lock(&dgram->gndg_conn->gnc_device->gnd_connd_lock);
2033 if (list_empty(&peer->gnp_connd_list)) {
2034 /* if peer isn't on waiting list, try to find one to nuke */
2035 rc = kgnilnd_find_and_cancel_dgram(peer->gnp_net->gnn_dev,
2039 LCONSOLE_INFO("Received NAK from %s for %s errno %d; "
2040 "canceled pending connect request\n",
2041 libcfs_nid2str(connreq->gncr_srcnid),
2042 libcfs_nid2str(connreq->gncr_dstnid), errno);
2045 /* if we can't find a waiting dgram, we just drop the nak - the conn
2046 * connect must have failed (didn't find conn above and clear connecting
2047 * -- so nothing to do besides drop */
2049 /* peer is on list, meaning it is a new connect attempt from the one
2050 * we started that generated the NAK - so just drop NAK */
2052 /* use negative to prevent error message */
2055 spin_unlock(&dgram->gndg_conn->gnc_device->gnd_connd_lock);
2058 /* success! we found a peer and at least marked pending_nak */
2059 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2065 kgnilnd_process_connreq(kgn_dgram_t *dgram, int *needs_nak)
2069 rc = kgnilnd_unpack_connreq(dgram);
2072 /* only NAK if we have good srcnid to use */
2078 switch (dgram->gndg_conn_in.gncr_type) {
2079 case GNILND_CONNREQ_REQ:
2080 /* wire up peer & conn, send queued TX */
2081 rc = kgnilnd_finish_connect(dgram);
2083 /* don't nak when the nid is hosed */
2089 case GNILND_CONNREQ_NAK:
2090 rc = kgnilnd_process_nak(dgram);
2091 /* return early to prevent reconnect bump */
2094 CERROR("unexpected connreq type %s (%d) from %s\n",
2095 kgnilnd_connreq_type2str(&dgram->gndg_conn_in),
2096 dgram->gndg_conn_in.gncr_type,
2097 libcfs_nid2str(dgram->gndg_conn_in.gncr_srcnid));
2108 kgnilnd_probe_and_process_dgram(kgn_device_t *dev)
2112 lnet_nid_t nak_dstnid = LNET_NID_ANY;
2113 lnet_nid_t orig_dstnid;
2114 kgn_dgram_t *dgram = NULL;
2118 if (CFS_FAIL_CHECK(CFS_FAIL_GNI_PAUSE_DGRAM_COMP)) {
2121 rc = kgnilnd_probe_for_dgram(dev, &dgram);
2126 } else if (rc < 0) {
2127 GOTO(inform_peer, rc);
2129 /* rc > 1 means it did something, reset for this func */
2133 switch (dgram->gndg_type) {
2134 case GNILND_DGRAM_WC_REQ:
2135 case GNILND_DGRAM_REQ:
2136 rc = kgnilnd_process_connreq(dgram, &needs_nak);
2138 case GNILND_DGRAM_NAK:
2139 CDEBUG(D_NETTRACE, "NAK to %s done\n",
2140 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid));
2143 CERROR("unknown datagram type %s (%d)\n",
2144 kgnilnd_dgram_type2str(dgram), dgram->gndg_type);
2148 /* stash data to use after releasing current datagram */
2149 /* don't stash net - we are operating on a net already,
2150 * so the lock on rw_net_lock is sufficient */
2152 nak_dstnid = dgram->gndg_conn_in.gncr_srcnid;
2155 LASSERTF(dgram != NULL, "dgram 0x%p rc %d needs_nak %d\n", dgram, rc, needs_nak);
2157 orig_dstnid = dgram->gndg_conn_out.gncr_dstnid;
2159 kgnilnd_release_dgram(dev, dgram, 0);
2161 CDEBUG(D_NET, "cleaning up dgram to %s, rc %d\n",
2162 libcfs_nid2str(orig_dstnid), rc);
2164 /* if this was a WC_REQ that matched an existing peer, it'll get marked done
2165 * in kgnilnd_finish_connect - if errors are from before we get to there,
2166 * we just drop as it is a WC_REQ - the peer CAN'T be waiting for it */
2167 if ((orig_dstnid != LNET_NID_ANY) && (rc < 0)) {
2168 /* if we have a negative rc, we want to find a peer to inform about
2169 * the bad connection attempt. Sorry buddy, better luck next time! */
2171 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2172 peer = kgnilnd_find_peer_locked(orig_dstnid);
2175 /* add ref to make sure he stays around past the possible unlink
2176 * so we can tell LNet about him */
2177 kgnilnd_peer_addref(peer);
2179 /* if he still cares about the outstanding connect */
2180 if (peer->gnp_connecting >= GNILND_PEER_CONNECT) {
2181 /* check if he is on the connd list and remove.. */
2182 spin_lock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2183 if (!list_empty(&peer->gnp_connd_list)) {
2184 list_del_init(&peer->gnp_connd_list);
2185 /* drop connd ref */
2186 kgnilnd_peer_decref(peer);
2188 spin_unlock(&peer->gnp_net->gnn_dev->gnd_connd_lock);
2190 /* clear gnp_connecting so we don't have a non-connecting peer
2191 * on gnd_connd_list */
2192 peer->gnp_connecting = GNILND_PEER_IDLE;
2194 set_mb(peer->gnp_last_dgram_errno, rc);
2196 kgnilnd_peer_increase_reconnect_locked(peer);
2199 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2201 /* now that we are outside the lock, tell Mommy */
2203 kgnilnd_peer_notify(peer, rc, 0);
2204 kgnilnd_peer_decref(peer);
2209 kgnilnd_send_nak(dev, nak_dstnid, rc);
2216 kgnilnd_reaper_dgram_check(kgn_device_t *dev)
2218 kgn_dgram_t *dgram, *tmp;
2221 spin_lock(&dev->gnd_dgram_lock);
2223 for (i = 0; i < (*kgnilnd_tunables.kgn_peer_hash_size - 1); i++) {
2224 list_for_each_entry_safe(dgram, tmp, &dev->gnd_dgrams[i], gndg_list) {
2225 unsigned long now = jiffies;
2226 unsigned long timeout;
2228 /* don't timeout stuff if the network is mucked or shutting down */
2229 if (kgnilnd_check_hw_quiesce()) {
2233 if ((dgram->gndg_state != GNILND_DGRAM_POSTED) ||
2234 (dgram->gndg_type == GNILND_DGRAM_WC_REQ)) {
2237 CDEBUG(D_NETTRACE, "checking dgram 0x%p type %s "
2238 "state %s conn 0x%p to %s age %lus\n",
2239 dgram, kgnilnd_dgram_type2str(dgram),
2240 kgnilnd_dgram_state2str(dgram), dgram->gndg_conn,
2241 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
2242 cfs_duration_sec(now - dgram->gndg_post_time));
2244 timeout = cfs_time_seconds(*kgnilnd_tunables.kgn_timeout);
2246 if (time_before(now, (dgram->gndg_post_time + timeout)))
2249 CNETERR("%s datagram to %s timed out @ %lus dgram "
2250 "0x%p state %s conn 0x%p\n",
2251 kgnilnd_dgram_type2str(dgram),
2252 libcfs_nid2str(dgram->gndg_conn_out.gncr_dstnid),
2253 cfs_duration_sec(now - dgram->gndg_post_time),
2254 dgram, kgnilnd_dgram_state2str(dgram),
2257 kgnilnd_cancel_dgram_locked(dgram);
2260 spin_unlock(&dev->gnd_dgram_lock);
2264 /* use a thread for the possibly long-blocking wait_by_id to prevent
2265 * stalling the global workqueues */
2267 kgnilnd_dgram_waitq(void *arg)
2269 kgn_device_t *dev = (kgn_device_t *) arg;
2273 DEFINE_WAIT(mover_done);
2275 snprintf(name, sizeof(name), "kgnilnd_dgn_%02d", dev->gnd_id);
2277 /* all gnilnd threads need to run fairly urgently */
2278 set_user_nice(current, *kgnilnd_tunables.kgn_nice);
2280 /* we dont shut down until the device shuts down ... */
2281 while (!kgnilnd_data.kgn_shutdown) {
2282 /* to quiesce or to not quiesce, that is the question */
2283 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
2284 KGNILND_SPIN_QUIESCE;
2287 while (CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_PAUSE_DGRAM_COMP, 1)) {}
2289 /* check once a second */
2290 grc = kgnilnd_postdata_probe_wait_by_id(dev->gnd_handle,
2293 if (grc == GNI_RC_SUCCESS) {
2294 CDEBUG(D_INFO, "waking up dgram mover thread\n");
2295 kgnilnd_schedule_dgram(dev);
2297 /* wait for dgram thread to ping us before spinning again */
2298 prepare_to_wait(&dev->gnd_dgping_waitq, &mover_done,
2299 TASK_INTERRUPTIBLE);
2301 /* don't sleep if we need to quiesce */
2302 if (likely(!kgnilnd_data.kgn_quiesce_trigger)) {
2305 finish_wait(&dev->gnd_dgping_waitq, &mover_done);
2309 kgnilnd_thread_fini();
2314 kgnilnd_start_outbound_dgrams(kgn_device_t *dev, unsigned long deadline)
2316 int did_something = 0, rc;
2317 kgn_peer_t *peer = NULL;
2319 spin_lock(&dev->gnd_connd_lock);
2321 /* Active connect - we added this in kgnilnd_launch_tx */
2322 while (!list_empty(&dev->gnd_connd_peers) && time_before(jiffies, deadline)) {
2323 peer = list_first_entry(&dev->gnd_connd_peers,
2324 kgn_peer_t, gnp_connd_list);
2326 /* ref for connd removed in if/else below */
2327 list_del_init(&peer->gnp_connd_list);
2329 /* gnp_connecting and membership on gnd_connd_peers should be
2330 * done coherently to avoid double adding, etc */
2331 /* don't need kgnilnd_data.kgn_peer_conn_lock here as that is only needed
2332 * to get the peer to gnp_connecting in the first place. We just need to
2333 * rely on gnd_connd_lock to serialize someone pulling him from the list
2334 * BEFORE clearing gnp_connecting */
2335 LASSERTF(peer->gnp_connecting != GNILND_PEER_IDLE, "peer 0x%p->%s not connecting\n",
2336 peer, libcfs_nid2str(peer->gnp_nid));
2338 spin_unlock(&dev->gnd_connd_lock);
2340 CDEBUG(D_NET, "processing connect to %s\n",
2341 libcfs_nid2str(peer->gnp_nid));
2344 rc = kgnilnd_start_connect(peer);
2346 if (likely(rc >= 0)) {
2347 /* 0 on success, positive on 'just drop peer' errors */
2348 kgnilnd_peer_decref(peer);
2349 } else if (rc == -ENOMEM) {
2350 /* if we are out of wildcards, add back to
2351 * connd_list - then break out and we'll try later
2352 * if other errors, we'll bail & cancel pending tx */
2353 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2354 if (peer->gnp_connecting == GNILND_PEER_POSTING) {
2355 peer->gnp_connecting = GNILND_PEER_CONNECT;
2356 spin_lock(&dev->gnd_connd_lock);
2357 list_add_tail(&peer->gnp_connd_list,
2358 &dev->gnd_connd_peers);
2360 /* connecting changed while we were posting */
2362 LASSERTF(peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH, "Peer is in invalid"
2363 " state 0x%p->%s, connecting %d\n",
2364 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
2365 peer->gnp_connecting = GNILND_PEER_KILL;
2366 spin_lock(&dev->gnd_connd_lock);
2367 /* remove the peer ref frrom the cond list */
2368 kgnilnd_peer_decref(peer);
2369 /* let the system handle itself */
2371 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2372 /* the datagrams are a global pool,
2373 * so break out of trying and hope some free
2378 /* something bad happened, you lose */
2379 CNETERR("could not start connecting to %s "
2380 "rc %d: Will retry until TX timeout\n",
2381 libcfs_nid2str(peer->gnp_nid), rc);
2382 /* It didnt post so just set connecting back to zero now.
2383 * The reaper will reattempt the connection if it needs too.
2384 * If the peer needs death set it so the reaper will cleanup.
2386 write_lock(&kgnilnd_data.kgn_peer_conn_lock);
2387 if (peer->gnp_connecting == GNILND_PEER_POSTING) {
2388 peer->gnp_connecting = GNILND_PEER_IDLE;
2389 kgnilnd_peer_increase_reconnect_locked(peer);
2391 LASSERTF(peer->gnp_connecting == GNILND_PEER_NEEDS_DEATH, "Peer is in invalid"
2392 " state 0x%p->%s, connecting %d\n",
2393 peer, libcfs_nid2str(peer->gnp_nid), peer->gnp_connecting);
2394 peer->gnp_connecting = GNILND_PEER_KILL;
2396 write_unlock(&kgnilnd_data.kgn_peer_conn_lock);
2398 /* hold onto ref until we are really done - if it was
2399 * unlinked this could result in a destroy */
2400 kgnilnd_peer_decref(peer);
2402 spin_lock(&dev->gnd_connd_lock);
2405 spin_unlock(&dev->gnd_connd_lock);
2406 RETURN(did_something);
2410 kgnilnd_repost_wc_dgrams(kgn_device_t *dev)
2412 int did_something = 0, to_repost, i;
2413 to_repost = atomic_read(&dev->gnd_nwcdgrams);
2416 for (i = 0; i < to_repost; ++i) {
2418 rerc = kgnilnd_post_dgram(dev, LNET_NID_ANY, GNILND_CONNREQ_REQ, 0);
2420 kgnilnd_admin_decref(dev->gnd_nwcdgrams);
2423 CDEBUG(D_NETERROR, "error %d: dev %d could not post wildcard datagram\n",
2429 RETURN(did_something);
2432 struct kgnilnd_dgram_timer {
2433 struct timer_list timer;
2438 kgnilnd_dgram_poke_with_stick(cfs_timer_cb_arg_t arg)
2440 struct kgnilnd_dgram_timer *t = cfs_from_timer(t, arg, timer);
2442 wake_up(&t->dev->gnd_dgram_waitq);
2445 /* use single thread for dgrams - should be sufficient for performance */
2447 kgnilnd_dgram_mover(void *arg)
2449 kgn_device_t *dev = (kgn_device_t *)arg;
2451 int rc, did_something;
2452 unsigned long next_purge_check = jiffies - 1;
2453 unsigned long timeout;
2454 struct kgnilnd_dgram_timer timer;
2455 unsigned long deadline = 0;
2458 snprintf(name, sizeof(name), "kgnilnd_dg_%02d", dev->gnd_id);
2460 /* all gnilnd threads need to run fairly urgently */
2461 set_user_nice(current, *kgnilnd_tunables.kgn_nice);
2463 /* we are ok not locking for these variables as the dgram waitq threads
2464 * will block both due to tying up net (kgn_shutdown) and the completion
2465 * event for the dgram_waitq (kgn_quiesce_trigger) */
2466 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_dgram_timeout);
2467 while (!kgnilnd_data.kgn_shutdown) {
2468 /* Safe: kgn_shutdown only set when quiescent */
2470 /* race with stack reset - we want to hold off seeing any new incoming dgrams
2471 * so we can force a dirty WC dgram for Bug 762072 - put right before
2472 * quiesce check so that it'll go right into that and not do any
2474 CFS_RACE(CFS_FAIL_GNI_WC_DGRAM_FREE);
2476 /* to quiesce or to not quiesce, that is the question */
2477 if (unlikely(kgnilnd_data.kgn_quiesce_trigger)) {
2478 KGNILND_SPIN_QUIESCE;
2482 CFS_RACE(CFS_FAIL_GNI_QUIESCE_RACE);
2484 /* process any newly completed dgrams */
2485 down_read(&kgnilnd_data.kgn_net_rw_sem);
2487 rc = kgnilnd_probe_and_process_dgram(dev);
2489 did_something += rc;
2492 up_read(&kgnilnd_data.kgn_net_rw_sem);
2494 CFS_FAIL_TIMEOUT(CFS_FAIL_GNI_DGRAM_DEADLINE,
2495 (*kgnilnd_tunables.kgn_dgram_timeout + 1));
2496 /* start new outbound dgrams */
2497 did_something += kgnilnd_start_outbound_dgrams(dev, deadline);
2499 /* find dead dgrams */
2500 if (time_after_eq(jiffies, next_purge_check)) {
2501 /* these don't need to be checked that often */
2502 kgnilnd_reaper_dgram_check(dev);
2504 next_purge_check = (long) jiffies +
2505 cfs_time_seconds(kgnilnd_data.kgn_new_min_timeout / 4);
2508 did_something += kgnilnd_repost_wc_dgrams(dev);
2510 /* careful with the jiffy wrap... */
2511 timeout = (long)(next_purge_check - jiffies);
2513 CDEBUG(D_INFO, "did %d timeout %lu next %lu jiffies %lu\n",
2514 did_something, timeout, next_purge_check, jiffies);
2516 if ((did_something || timeout <= 0) && time_before(jiffies, deadline)) {
2521 prepare_to_wait(&dev->gnd_dgram_waitq, &wait, TASK_INTERRUPTIBLE);
2523 cfs_timer_setup(&timer.timer,
2524 kgnilnd_dgram_poke_with_stick,
2527 mod_timer(&timer.timer, (long) jiffies + timeout);
2529 /* last second chance for others to poke us */
2530 did_something += xchg(&dev->gnd_dgram_ready, GNILND_DGRAM_IDLE);
2532 /* check flag variables before committing even if we
2533 * did something; if we are after the deadline call
2535 if ((!did_something || time_after(jiffies, deadline)) &&
2536 !kgnilnd_data.kgn_shutdown &&
2537 !kgnilnd_data.kgn_quiesce_trigger) {
2538 CDEBUG(D_INFO, "schedule timeout %ld (%lu sec)\n",
2539 timeout, cfs_duration_sec(timeout));
2540 wake_up_all(&dev->gnd_dgping_waitq);
2542 CDEBUG(D_INFO, "awake after schedule\n");
2543 deadline = jiffies + cfs_time_seconds(*kgnilnd_tunables.kgn_dgram_timeout);
2546 del_singleshot_timer_sync(&timer.timer);
2547 finish_wait(&dev->gnd_dgram_waitq, &wait);
2550 kgnilnd_thread_fini();