1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lnet/klnds/o2iblnd/o2iblnd_cb.c
38 * Author: Eric Barton <eric@bartonsoftware.com>
44 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
46 lnet_msg_t *lntmsg[2];
47 kib_net_t *net = ni->ni_data;
51 LASSERT (net != NULL);
52 LASSERT (!in_interrupt());
53 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
54 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
55 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer response */
56 LASSERT (tx->tx_pool != NULL);
58 kiblnd_unmap_tx(ni, tx);
60 /* tx may have up to 2 lnet msgs to finalise */
61 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
62 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
65 if (tx->tx_conn != NULL) {
66 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
68 kiblnd_conn_decref(tx->tx_conn);
75 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
77 /* delay finalize until my descs have been freed */
78 for (i = 0; i < 2; i++) {
79 if (lntmsg[i] == NULL)
82 lnet_finalize(ni, lntmsg[i], rc);
87 kiblnd_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int status)
91 while (!list_empty (txlist)) {
92 tx = list_entry (txlist->next, kib_tx_t, tx_list);
94 list_del(&tx->tx_list);
97 tx->tx_status = status;
98 kiblnd_tx_done(ni, tx);
103 kiblnd_get_idle_tx (lnet_ni_t *ni)
105 kib_net_t *net = (kib_net_t *)ni->ni_data;
106 struct list_head *node;
109 node = kiblnd_pool_alloc_node(&net->ibn_tx_ps.tps_poolset);
112 tx = container_of(node, kib_tx_t, tx_list);
114 LASSERT (tx->tx_nwrq == 0);
115 LASSERT (!tx->tx_queued);
116 LASSERT (tx->tx_sending == 0);
117 LASSERT (!tx->tx_waiting);
118 LASSERT (tx->tx_status == 0);
119 LASSERT (tx->tx_conn == NULL);
120 LASSERT (tx->tx_lntmsg[0] == NULL);
121 LASSERT (tx->tx_lntmsg[1] == NULL);
122 LASSERT (tx->tx_u.pmr == NULL);
123 LASSERT (tx->tx_nfrags == 0);
129 kiblnd_drop_rx (kib_rx_t *rx)
131 kib_conn_t *conn = rx->rx_conn;
134 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
135 LASSERT (conn->ibc_nrx > 0);
137 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
139 kiblnd_conn_decref(conn);
143 kiblnd_post_rx (kib_rx_t *rx, int credit)
145 kib_conn_t *conn = rx->rx_conn;
146 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
147 struct ib_recv_wr *bad_wrq = NULL;
151 LASSERT (net != NULL);
152 LASSERT (!in_interrupt());
153 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
154 credit == IBLND_POSTRX_PEER_CREDIT ||
155 credit == IBLND_POSTRX_RSRVD_CREDIT);
157 mr = kiblnd_find_dma_mr(net, rx->rx_msgaddr, IBLND_MSG_SIZE);
158 LASSERT (mr != NULL);
160 rx->rx_sge.lkey = mr->lkey;
161 rx->rx_sge.addr = rx->rx_msgaddr;
162 rx->rx_sge.length = IBLND_MSG_SIZE;
164 rx->rx_wrq.next = NULL;
165 rx->rx_wrq.sg_list = &rx->rx_sge;
166 rx->rx_wrq.num_sge = 1;
167 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
169 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
170 LASSERT (rx->rx_nob >= 0); /* not posted */
172 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
173 kiblnd_drop_rx(rx); /* No more posts for this rx */
177 rx->rx_nob = -1; /* flag posted */
179 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
181 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
182 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
186 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
190 kiblnd_close_conn(conn, rc);
191 kiblnd_drop_rx(rx); /* No more posts for this rx */
195 if (credit == IBLND_POSTRX_NO_CREDIT)
198 spin_lock(&conn->ibc_lock);
199 if (credit == IBLND_POSTRX_PEER_CREDIT)
200 conn->ibc_outstanding_credits++;
202 conn->ibc_reserved_credits++;
203 spin_unlock(&conn->ibc_lock);
205 kiblnd_check_sends(conn);
210 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
212 struct list_head *tmp;
214 list_for_each(tmp, &conn->ibc_active_txs) {
215 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
217 LASSERT (!tx->tx_queued);
218 LASSERT (tx->tx_sending != 0 || tx->tx_waiting);
220 if (tx->tx_cookie != cookie)
223 if (tx->tx_waiting &&
224 tx->tx_msg->ibm_type == txtype)
227 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
228 tx->tx_waiting ? "" : "NOT ",
229 tx->tx_msg->ibm_type, txtype);
235 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
238 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
241 spin_lock(&conn->ibc_lock);
243 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
245 spin_unlock(&conn->ibc_lock);
247 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
248 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
249 kiblnd_close_conn(conn, -EPROTO);
253 if (tx->tx_status == 0) { /* success so far */
254 if (status < 0) { /* failed? */
255 tx->tx_status = status;
256 } else if (txtype == IBLND_MSG_GET_REQ) {
257 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
263 idle = !tx->tx_queued && (tx->tx_sending == 0);
265 list_del(&tx->tx_list);
267 spin_unlock(&conn->ibc_lock);
270 kiblnd_tx_done(ni, tx);
274 kiblnd_send_completion (kib_conn_t *conn, int type, int status, __u64 cookie)
276 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
277 kib_tx_t *tx = kiblnd_get_idle_tx(ni);
280 CERROR("Can't get tx for completion %x for %s\n",
281 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
285 tx->tx_msg->ibm_u.completion.ibcm_status = status;
286 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
287 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
289 kiblnd_queue_tx(tx, conn);
293 kiblnd_handle_rx (kib_rx_t *rx)
295 kib_msg_t *msg = rx->rx_msg;
296 kib_conn_t *conn = rx->rx_conn;
297 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
298 int credits = msg->ibm_credits;
304 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
306 CDEBUG (D_NET, "Received %x[%d] from %s\n",
307 msg->ibm_type, credits, libcfs_nid2str(conn->ibc_peer->ibp_nid));
310 /* Have I received credits that will let me send? */
311 spin_lock(&conn->ibc_lock);
313 if (conn->ibc_credits + credits >
314 IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
315 rc2 = conn->ibc_credits;
316 spin_unlock(&conn->ibc_lock);
318 CERROR("Bad credits from %s: %d + %d > %d\n",
319 libcfs_nid2str(conn->ibc_peer->ibp_nid),
320 rc2, credits, IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
322 kiblnd_close_conn(conn, -EPROTO);
323 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
327 conn->ibc_credits += credits;
329 spin_unlock(&conn->ibc_lock);
330 kiblnd_check_sends(conn);
333 switch (msg->ibm_type) {
335 CERROR("Bad IBLND message type %x from %s\n",
336 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
337 post_credit = IBLND_POSTRX_NO_CREDIT;
342 if (IBLND_OOB_CAPABLE(conn->ibc_version))
343 post_credit = IBLND_POSTRX_NO_CREDIT;
345 post_credit = IBLND_POSTRX_PEER_CREDIT;
348 case IBLND_MSG_IMMEDIATE:
349 post_credit = IBLND_POSTRX_DONT_POST;
350 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
351 msg->ibm_srcnid, rx, 0);
352 if (rc < 0) /* repost on error */
353 post_credit = IBLND_POSTRX_PEER_CREDIT;
356 case IBLND_MSG_PUT_REQ:
357 post_credit = IBLND_POSTRX_DONT_POST;
358 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
359 msg->ibm_srcnid, rx, 1);
360 if (rc < 0) /* repost on error */
361 post_credit = IBLND_POSTRX_PEER_CREDIT;
364 case IBLND_MSG_PUT_NAK:
365 CWARN ("PUT_NACK from %s\n", libcfs_nid2str(conn->ibc_peer->ibp_nid));
366 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
367 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
368 msg->ibm_u.completion.ibcm_status,
369 msg->ibm_u.completion.ibcm_cookie);
372 case IBLND_MSG_PUT_ACK:
373 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
375 spin_lock(&conn->ibc_lock);
376 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
377 msg->ibm_u.putack.ibpam_src_cookie);
379 list_del(&tx->tx_list);
380 spin_unlock(&conn->ibc_lock);
383 CERROR("Unmatched PUT_ACK from %s\n",
384 libcfs_nid2str(conn->ibc_peer->ibp_nid));
389 LASSERT (tx->tx_waiting);
390 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
391 * (a) I can overwrite tx_msg since my peer has received it!
392 * (b) tx_waiting set tells tx_complete() it's not done. */
394 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
396 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
397 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
398 &msg->ibm_u.putack.ibpam_rd,
399 msg->ibm_u.putack.ibpam_dst_cookie);
401 CERROR("Can't setup rdma for PUT to %s: %d\n",
402 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
404 spin_lock(&conn->ibc_lock);
405 tx->tx_waiting = 0; /* clear waiting and queue atomically */
406 kiblnd_queue_tx_locked(tx, conn);
407 spin_unlock(&conn->ibc_lock);
410 case IBLND_MSG_PUT_DONE:
411 post_credit = IBLND_POSTRX_PEER_CREDIT;
412 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
413 msg->ibm_u.completion.ibcm_status,
414 msg->ibm_u.completion.ibcm_cookie);
417 case IBLND_MSG_GET_REQ:
418 post_credit = IBLND_POSTRX_DONT_POST;
419 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
420 msg->ibm_srcnid, rx, 1);
421 if (rc < 0) /* repost on error */
422 post_credit = IBLND_POSTRX_PEER_CREDIT;
425 case IBLND_MSG_GET_DONE:
426 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
427 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
428 msg->ibm_u.completion.ibcm_status,
429 msg->ibm_u.completion.ibcm_cookie);
433 if (rc < 0) /* protocol error */
434 kiblnd_close_conn(conn, rc);
436 if (post_credit != IBLND_POSTRX_DONT_POST)
437 kiblnd_post_rx(rx, post_credit);
441 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
443 kib_msg_t *msg = rx->rx_msg;
444 kib_conn_t *conn = rx->rx_conn;
445 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
446 kib_net_t *net = ni->ni_data;
450 LASSERT (net != NULL);
451 LASSERT (rx->rx_nob < 0); /* was posted */
452 rx->rx_nob = 0; /* isn't now */
454 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
457 if (status != IB_WC_SUCCESS) {
458 CDEBUG(D_NETERROR, "Rx from %s failed: %d\n",
459 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
466 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
468 CERROR ("Error %d unpacking rx from %s\n",
469 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
473 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
474 msg->ibm_dstnid != ni->ni_nid ||
475 msg->ibm_srcstamp != conn->ibc_incarnation ||
476 msg->ibm_dststamp != net->ibn_incarnation) {
477 CERROR ("Stale rx from %s\n",
478 libcfs_nid2str(conn->ibc_peer->ibp_nid));
483 /* set time last known alive */
484 kiblnd_peer_alive(conn->ibc_peer);
486 /* racing with connection establishment/teardown! */
488 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
489 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
492 write_lock_irqsave(g_lock, flags);
493 /* must check holding global lock to eliminate race */
494 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
495 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
496 write_unlock_irqrestore(g_lock, flags);
499 write_unlock_irqrestore(g_lock, flags);
501 kiblnd_handle_rx(rx);
505 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
506 kiblnd_close_conn(conn, err);
508 kiblnd_drop_rx(rx); /* Don't re-post rx. */
512 kiblnd_kvaddr_to_page (unsigned long vaddr)
516 if (vaddr >= VMALLOC_START &&
517 vaddr < VMALLOC_END) {
518 page = vmalloc_to_page ((void *)vaddr);
519 LASSERT (page != NULL);
522 #ifdef CONFIG_HIGHMEM
523 if (vaddr >= PKMAP_BASE &&
524 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
525 /* No highmem pages only used for bulk (kiov) I/O */
526 CERROR("find page for address in highmem\n");
530 page = virt_to_page (vaddr);
531 LASSERT (page != NULL);
536 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
538 kib_dev_t *ibdev = net->ibn_dev;
539 __u64 *pages = tx->tx_pages;
545 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
546 for (size = 0; size < rd->rd_frags[i].rf_nob;
547 size += ibdev->ibd_page_size) {
548 pages[npages ++] = (rd->rd_frags[i].rf_addr &
549 ibdev->ibd_page_mask) + size;
553 rc = kiblnd_fmr_pool_map(&net->ibn_fmr_ps, pages, npages, 0, &tx->tx_u.fmr);
555 CERROR ("Can't map %d pages: %d\n", npages, rc);
559 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
561 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.fmr.fmr_pfmr->fmr->rkey :
562 tx->tx_u.fmr.fmr_pfmr->fmr->lkey;
563 rd->rd_frags[0].rf_addr &= ~ibdev->ibd_page_mask;
564 rd->rd_frags[0].rf_nob = nob;
571 kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
576 iova = rd->rd_frags[0].rf_addr & ~net->ibn_dev->ibd_page_mask;
578 rc = kiblnd_pmr_pool_map(&net->ibn_pmr_ps, rd, &iova, &tx->tx_u.pmr);
580 CERROR("Failed to create MR by phybuf: %d\n", rc);
584 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
586 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.pmr->pmr_mr->rkey :
587 tx->tx_u.pmr->pmr_mr->lkey;
589 rd->rd_frags[0].rf_addr = iova;
590 rd->rd_frags[0].rf_nob = nob;
596 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
598 kib_net_t *net = ni->ni_data;
600 LASSERT (net != NULL);
602 if (net->ibn_with_fmr && tx->tx_u.fmr.fmr_pfmr != NULL) {
603 kiblnd_fmr_pool_unmap(&tx->tx_u.fmr, tx->tx_status);
604 tx->tx_u.fmr.fmr_pfmr = NULL;
605 } else if (net->ibn_with_pmr && tx->tx_u.pmr != NULL) {
606 kiblnd_pmr_pool_unmap(tx->tx_u.pmr);
610 if (tx->tx_nfrags != 0) {
611 kiblnd_dma_unmap_sg(net->ibn_dev->ibd_cmid->device,
612 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
618 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
619 kib_rdma_desc_t *rd, int nfrags)
621 kib_net_t *net = ni->ni_data;
622 struct ib_mr *mr = NULL;
626 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
628 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
629 tx->tx_nfrags = nfrags;
632 kiblnd_dma_map_sg(net->ibn_dev->ibd_cmid->device,
633 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
635 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
636 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
637 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
638 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
639 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
640 nob += rd->rd_frags[i].rf_nob;
643 /* looking for pre-mapping MR */
644 mr = kiblnd_find_rd_dma_mr(net, rd);
646 /* found pre-mapping MR */
647 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
651 if (net->ibn_with_fmr)
652 return kiblnd_fmr_map_tx(net, tx, rd, nob);
653 else if (net->ibn_with_pmr)
654 return kiblnd_pmr_map_tx(net, tx, rd, nob);
661 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
662 unsigned int niov, struct iovec *iov, int offset, int nob)
664 kib_net_t *net = ni->ni_data;
666 struct scatterlist *sg;
673 LASSERT (net != NULL);
675 while (offset >= iov->iov_len) {
676 offset -= iov->iov_len;
686 vaddr = ((unsigned long)iov->iov_base) + offset;
687 page_offset = vaddr & (PAGE_SIZE - 1);
688 page = kiblnd_kvaddr_to_page(vaddr);
690 CERROR ("Can't find page\n");
694 fragnob = min((int)(iov->iov_len - offset), nob);
695 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
697 sg_set_page(sg, page, fragnob, page_offset);
700 if (offset + fragnob < iov->iov_len) {
710 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
714 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
715 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
717 kib_net_t *net = ni->ni_data;
718 struct scatterlist *sg;
721 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
725 LASSERT (net != NULL);
727 while (offset >= kiov->kiov_len) {
728 offset -= kiov->kiov_len;
738 fragnob = min((int)(kiov->kiov_len - offset), nob);
740 memset(sg, 0, sizeof(*sg));
741 sg_set_page(sg, kiov->kiov_page, fragnob,
742 kiov->kiov_offset + offset);
751 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
755 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
757 kib_msg_t *msg = tx->tx_msg;
758 kib_peer_t *peer = conn->ibc_peer;
759 int ver = conn->ibc_version;
762 struct ib_send_wr *bad_wrq;
764 LASSERT (tx->tx_queued);
765 /* We rely on this for QP sizing */
766 LASSERT (tx->tx_nwrq > 0);
767 LASSERT (tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
769 LASSERT (credit == 0 || credit == 1);
770 LASSERT (conn->ibc_outstanding_credits >= 0);
771 LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
772 LASSERT (conn->ibc_credits >= 0);
773 LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
775 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
776 /* tx completions outstanding... */
777 CDEBUG(D_NET, "%s: posted enough\n",
778 libcfs_nid2str(peer->ibp_nid));
782 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
783 CDEBUG(D_NET, "%s: no credits\n",
784 libcfs_nid2str(peer->ibp_nid));
788 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
789 conn->ibc_credits == 1 && /* last credit reserved for */
790 conn->ibc_outstanding_credits == 0) { /* giving back credits */
791 CDEBUG(D_NET, "%s: not using last credit\n",
792 libcfs_nid2str(peer->ibp_nid));
796 /* NB don't drop ibc_lock before bumping tx_sending */
797 list_del(&tx->tx_list);
800 if (msg->ibm_type == IBLND_MSG_NOOP &&
801 (!kiblnd_send_noop(conn) || /* redundant NOOP */
802 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
803 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
804 /* OK to drop when posted enough NOOPs, since
805 * kiblnd_check_sends will queue NOOP again when
806 * posted NOOPs complete */
807 spin_unlock(&conn->ibc_lock);
808 kiblnd_tx_done(peer->ibp_ni, tx);
809 spin_lock(&conn->ibc_lock);
810 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
811 libcfs_nid2str(peer->ibp_nid),
812 conn->ibc_noops_posted);
816 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
817 peer->ibp_nid, conn->ibc_incarnation);
819 conn->ibc_credits -= credit;
820 conn->ibc_outstanding_credits = 0;
821 conn->ibc_nsends_posted++;
822 if (msg->ibm_type == IBLND_MSG_NOOP)
823 conn->ibc_noops_posted++;
825 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
826 * PUT. If so, it was first queued here as a PUT_REQ, sent and
827 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
828 * and then re-queued here. It's (just) possible that
829 * tx_sending is non-zero if we've not done the tx_complete()
830 * from the first send; hence the ++ rather than = below. */
832 list_add(&tx->tx_list, &conn->ibc_active_txs);
834 /* I'm still holding ibc_lock! */
835 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
838 rc = ib_post_send(conn->ibc_cmid->qp,
839 tx->tx_wrq, &bad_wrq);
840 conn->ibc_last_send = jiffies;
845 /* NB credits are transferred in the actual
846 * message, which can only be the last work item */
847 conn->ibc_credits += credit;
848 conn->ibc_outstanding_credits += msg->ibm_credits;
849 conn->ibc_nsends_posted--;
850 if (msg->ibm_type == IBLND_MSG_NOOP)
851 conn->ibc_noops_posted--;
857 done = (tx->tx_sending == 0);
859 list_del(&tx->tx_list);
861 spin_unlock(&conn->ibc_lock);
863 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
864 CERROR("Error %d posting transmit to %s\n",
865 rc, libcfs_nid2str(peer->ibp_nid));
867 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
868 rc, libcfs_nid2str(peer->ibp_nid));
870 kiblnd_close_conn(conn, rc);
873 kiblnd_tx_done(peer->ibp_ni, tx);
878 kiblnd_check_sends (kib_conn_t *conn)
880 int ver = conn->ibc_version;
881 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
884 /* Don't send anything until after the connection is established */
885 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
886 CDEBUG(D_NET, "%s too soon\n",
887 libcfs_nid2str(conn->ibc_peer->ibp_nid));
891 spin_lock(&conn->ibc_lock);
893 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
894 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
895 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
896 LASSERT (conn->ibc_reserved_credits >= 0);
898 while (conn->ibc_reserved_credits > 0 &&
899 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
900 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
902 list_del(&tx->tx_list);
903 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
904 conn->ibc_reserved_credits--;
907 if (kiblnd_send_noop(conn)) {
908 spin_unlock(&conn->ibc_lock);
910 tx = kiblnd_get_idle_tx(ni);
912 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
914 spin_lock(&conn->ibc_lock);
916 kiblnd_queue_tx_locked(tx, conn);
922 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
924 tx = list_entry(conn->ibc_tx_queue_nocred.next,
926 } else if (!list_empty(&conn->ibc_tx_queue)) {
928 tx = list_entry(conn->ibc_tx_queue.next,
933 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
937 spin_unlock(&conn->ibc_lock);
941 kiblnd_tx_complete (kib_tx_t *tx, int status)
943 int failed = (status != IB_WC_SUCCESS);
944 kib_conn_t *conn = tx->tx_conn;
947 LASSERT (tx->tx_sending > 0);
950 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
951 CDEBUG(D_NETERROR, "Tx -> %s cookie "LPX64
952 " sending %d waiting %d: failed %d\n",
953 libcfs_nid2str(conn->ibc_peer->ibp_nid),
954 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
957 kiblnd_close_conn(conn, -EIO);
959 kiblnd_peer_alive(conn->ibc_peer);
962 spin_lock(&conn->ibc_lock);
964 /* I could be racing with rdma completion. Whoever makes 'tx' idle
965 * gets to free it, which also drops its ref on 'conn'. */
968 conn->ibc_nsends_posted--;
969 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
970 conn->ibc_noops_posted--;
973 tx->tx_waiting = 0; /* don't wait for peer */
974 tx->tx_status = -EIO;
977 idle = (tx->tx_sending == 0) && /* This is the final callback */
978 !tx->tx_waiting && /* Not waiting for peer */
979 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
981 list_del(&tx->tx_list);
983 kiblnd_conn_addref(conn); /* 1 ref for me.... */
985 spin_unlock(&conn->ibc_lock);
988 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
990 kiblnd_check_sends(conn);
992 kiblnd_conn_decref(conn); /* ...until here */
996 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
998 kib_net_t *net = ni->ni_data;
999 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1000 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1001 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1004 LASSERT (net != NULL);
1005 LASSERT (tx->tx_nwrq >= 0);
1006 LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1007 LASSERT (nob <= IBLND_MSG_SIZE);
1009 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1011 mr = kiblnd_find_dma_mr(net, tx->tx_msgaddr, nob);
1012 LASSERT (mr != NULL);
1014 sge->lkey = mr->lkey;
1015 sge->addr = tx->tx_msgaddr;
1018 memset(wrq, 0, sizeof(*wrq));
1021 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1024 wrq->opcode = IB_WR_SEND;
1025 wrq->send_flags = IB_SEND_SIGNALED;
1031 kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1032 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1034 kib_msg_t *ibmsg = tx->tx_msg;
1035 kib_rdma_desc_t *srcrd = tx->tx_rd;
1036 struct ib_sge *sge = &tx->tx_sge[0];
1037 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1043 LASSERT (!in_interrupt());
1044 LASSERT (tx->tx_nwrq == 0);
1045 LASSERT (type == IBLND_MSG_GET_DONE ||
1046 type == IBLND_MSG_PUT_DONE);
1048 srcidx = dstidx = 0;
1051 if (srcidx >= srcrd->rd_nfrags) {
1052 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1057 if (dstidx == dstrd->rd_nfrags) {
1058 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1063 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1064 CERROR("RDMA too fragmented for %s (%d): "
1065 "%d/%d src %d/%d dst frags\n",
1066 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1067 IBLND_RDMA_FRAGS(conn->ibc_version),
1068 srcidx, srcrd->rd_nfrags,
1069 dstidx, dstrd->rd_nfrags);
1074 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1075 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1077 sge = &tx->tx_sge[tx->tx_nwrq];
1078 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1079 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1080 sge->length = wrknob;
1082 wrq = &tx->tx_wrq[tx->tx_nwrq];
1084 wrq->next = wrq + 1;
1085 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1088 wrq->opcode = IB_WR_RDMA_WRITE;
1089 wrq->send_flags = 0;
1091 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1092 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1094 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1095 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1104 if (rc < 0) /* no RDMA if completing with failure */
1107 ibmsg->ibm_u.completion.ibcm_status = rc;
1108 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1109 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1110 type, sizeof (kib_completion_msg_t));
1116 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1118 struct list_head *q;
1120 LASSERT (tx->tx_nwrq > 0); /* work items set up */
1121 LASSERT (!tx->tx_queued); /* not queued for sending already */
1122 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1125 tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
1127 if (tx->tx_conn == NULL) {
1128 kiblnd_conn_addref(conn);
1130 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1132 /* PUT_DONE first attached to conn as a PUT_REQ */
1133 LASSERT (tx->tx_conn == conn);
1134 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1137 switch (tx->tx_msg->ibm_type) {
1141 case IBLND_MSG_PUT_REQ:
1142 case IBLND_MSG_GET_REQ:
1143 q = &conn->ibc_tx_queue_rsrvd;
1146 case IBLND_MSG_PUT_NAK:
1147 case IBLND_MSG_PUT_ACK:
1148 case IBLND_MSG_PUT_DONE:
1149 case IBLND_MSG_GET_DONE:
1150 q = &conn->ibc_tx_queue_nocred;
1153 case IBLND_MSG_NOOP:
1154 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1155 q = &conn->ibc_tx_queue_nocred;
1157 q = &conn->ibc_tx_queue;
1160 case IBLND_MSG_IMMEDIATE:
1161 q = &conn->ibc_tx_queue;
1165 list_add_tail(&tx->tx_list, q);
1169 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1171 spin_lock(&conn->ibc_lock);
1172 kiblnd_queue_tx_locked(tx, conn);
1173 spin_unlock(&conn->ibc_lock);
1175 kiblnd_check_sends(conn);
1179 kiblnd_connect_peer (kib_peer_t *peer)
1181 struct rdma_cm_id *cmid;
1183 kib_net_t *net = peer->ibp_ni->ni_data;
1184 struct sockaddr_in srcaddr;
1185 struct sockaddr_in dstaddr;
1188 LASSERT (net != NULL);
1189 LASSERT (peer->ibp_connecting > 0);
1191 cmid = rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP);
1193 CERROR("Can't create CMID for %s: %ld\n",
1194 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1200 memset(&srcaddr, 0, sizeof(srcaddr));
1201 srcaddr.sin_family = AF_INET;
1202 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1204 memset(&dstaddr, 0, sizeof(dstaddr));
1205 dstaddr.sin_family = AF_INET;
1206 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1207 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1209 kiblnd_peer_addref(peer); /* cmid's ref */
1211 rc = rdma_resolve_addr(cmid,
1212 (struct sockaddr *)&srcaddr,
1213 (struct sockaddr *)&dstaddr,
1214 *kiblnd_tunables.kib_timeout * 1000);
1216 LASSERT (cmid->device != NULL);
1217 CDEBUG(D_NET, "%s: connection bound to %s:%u.%u.%u.%u:%s\n",
1218 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1219 HIPQUAD(dev->ibd_ifip), cmid->device->name);
1223 /* Can't initiate address resolution: */
1224 CERROR("Can't resolve addr for %s: %d\n",
1225 libcfs_nid2str(peer->ibp_nid), rc);
1227 kiblnd_peer_decref(peer); /* cmid's ref */
1228 rdma_destroy_id(cmid);
1230 kiblnd_peer_connect_failed(peer, 1, rc);
1234 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1239 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1240 unsigned long flags;
1243 /* If I get here, I've committed to send, so I complete the tx with
1244 * failure on any problems */
1246 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1247 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1249 /* First time, just use a read lock since I expect to find my peer
1251 read_lock_irqsave(g_lock, flags);
1253 peer = kiblnd_find_peer_locked(nid);
1254 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1255 /* Found a peer with an established connection */
1256 conn = kiblnd_get_conn_locked(peer);
1257 kiblnd_conn_addref(conn); /* 1 ref for me... */
1259 read_unlock_irqrestore(g_lock, flags);
1262 kiblnd_queue_tx(tx, conn);
1263 kiblnd_conn_decref(conn); /* ...to here */
1267 read_unlock(g_lock);
1268 /* Re-try with a write lock */
1271 peer = kiblnd_find_peer_locked(nid);
1273 if (list_empty(&peer->ibp_conns)) {
1274 /* found a peer, but it's still connecting... */
1275 LASSERT (peer->ibp_connecting != 0 ||
1276 peer->ibp_accepting != 0);
1278 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1279 write_unlock_irqrestore(g_lock, flags);
1281 conn = kiblnd_get_conn_locked(peer);
1282 kiblnd_conn_addref(conn); /* 1 ref for me... */
1284 write_unlock_irqrestore(g_lock, flags);
1287 kiblnd_queue_tx(tx, conn);
1288 kiblnd_conn_decref(conn); /* ...to here */
1293 write_unlock_irqrestore(g_lock, flags);
1295 /* Allocate a peer ready to add to the peer table and retry */
1296 rc = kiblnd_create_peer(ni, &peer, nid);
1298 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1300 tx->tx_status = -EHOSTUNREACH;
1302 kiblnd_tx_done(ni, tx);
1307 write_lock_irqsave(g_lock, flags);
1309 peer2 = kiblnd_find_peer_locked(nid);
1310 if (peer2 != NULL) {
1311 if (list_empty(&peer2->ibp_conns)) {
1312 /* found a peer, but it's still connecting... */
1313 LASSERT (peer2->ibp_connecting != 0 ||
1314 peer2->ibp_accepting != 0);
1316 list_add_tail(&tx->tx_list, &peer2->ibp_tx_queue);
1317 write_unlock_irqrestore(g_lock, flags);
1319 conn = kiblnd_get_conn_locked(peer2);
1320 kiblnd_conn_addref(conn); /* 1 ref for me... */
1322 write_unlock_irqrestore(g_lock, flags);
1325 kiblnd_queue_tx(tx, conn);
1326 kiblnd_conn_decref(conn); /* ...to here */
1329 kiblnd_peer_decref(peer);
1333 /* Brand new peer */
1334 LASSERT (peer->ibp_connecting == 0);
1335 peer->ibp_connecting = 1;
1337 /* always called with a ref on ni, which prevents ni being shutdown */
1338 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1341 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1343 kiblnd_peer_addref(peer);
1344 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1346 write_unlock_irqrestore(g_lock, flags);
1348 kiblnd_connect_peer(peer);
1349 kiblnd_peer_decref(peer);
1353 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1355 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1356 int type = lntmsg->msg_type;
1357 lnet_process_id_t target = lntmsg->msg_target;
1358 int target_is_router = lntmsg->msg_target_is_router;
1359 int routing = lntmsg->msg_routing;
1360 unsigned int payload_niov = lntmsg->msg_niov;
1361 struct iovec *payload_iov = lntmsg->msg_iov;
1362 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1363 unsigned int payload_offset = lntmsg->msg_offset;
1364 unsigned int payload_nob = lntmsg->msg_len;
1370 /* NB 'private' is different depending on what we're sending.... */
1372 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1373 payload_nob, payload_niov, libcfs_id2str(target));
1375 LASSERT (payload_nob == 0 || payload_niov > 0);
1376 LASSERT (payload_niov <= LNET_MAX_IOV);
1378 /* Thread context */
1379 LASSERT (!in_interrupt());
1380 /* payload is either all vaddrs or all pages */
1381 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1389 LASSERT (payload_nob == 0);
1393 if (routing || target_is_router)
1394 break; /* send IMMEDIATE */
1396 /* is the REPLY message too small for RDMA? */
1397 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1398 if (nob <= IBLND_MSG_SIZE)
1399 break; /* send IMMEDIATE */
1401 tx = kiblnd_get_idle_tx(ni);
1403 CERROR("Can't allocate txd for GET to %s: \n",
1404 libcfs_nid2str(target.nid));
1410 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1411 rc = kiblnd_setup_rd_iov(ni, tx,
1412 &ibmsg->ibm_u.get.ibgm_rd,
1413 lntmsg->msg_md->md_niov,
1414 lntmsg->msg_md->md_iov.iov,
1415 0, lntmsg->msg_md->md_length);
1417 rc = kiblnd_setup_rd_kiov(ni, tx,
1418 &ibmsg->ibm_u.get.ibgm_rd,
1419 lntmsg->msg_md->md_niov,
1420 lntmsg->msg_md->md_iov.kiov,
1421 0, lntmsg->msg_md->md_length);
1423 CERROR("Can't setup GET sink for %s: %d\n",
1424 libcfs_nid2str(target.nid), rc);
1425 kiblnd_tx_done(ni, tx);
1429 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1430 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1431 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1433 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1435 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1436 if (tx->tx_lntmsg[1] == NULL) {
1437 CERROR("Can't create reply for GET -> %s\n",
1438 libcfs_nid2str(target.nid));
1439 kiblnd_tx_done(ni, tx);
1443 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1444 tx->tx_waiting = 1; /* waiting for GET_DONE */
1445 kiblnd_launch_tx(ni, tx, target.nid);
1448 case LNET_MSG_REPLY:
1450 /* Is the payload small enough not to need RDMA? */
1451 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1452 if (nob <= IBLND_MSG_SIZE)
1453 break; /* send IMMEDIATE */
1455 tx = kiblnd_get_idle_tx(ni);
1457 CERROR("Can't allocate %s txd for %s\n",
1458 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1459 libcfs_nid2str(target.nid));
1463 if (payload_kiov == NULL)
1464 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1465 payload_niov, payload_iov,
1466 payload_offset, payload_nob);
1468 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1469 payload_niov, payload_kiov,
1470 payload_offset, payload_nob);
1472 CERROR("Can't setup PUT src for %s: %d\n",
1473 libcfs_nid2str(target.nid), rc);
1474 kiblnd_tx_done(ni, tx);
1479 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1480 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1481 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1483 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1484 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1485 kiblnd_launch_tx(ni, tx, target.nid);
1489 /* send IMMEDIATE */
1491 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1494 tx = kiblnd_get_idle_tx(ni);
1496 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1497 type, libcfs_nid2str(target.nid));
1502 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1504 if (payload_kiov != NULL)
1505 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1506 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1507 payload_niov, payload_kiov,
1508 payload_offset, payload_nob);
1510 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1511 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1512 payload_niov, payload_iov,
1513 payload_offset, payload_nob);
1515 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1516 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1518 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1519 kiblnd_launch_tx(ni, tx, target.nid);
1524 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1526 lnet_process_id_t target = lntmsg->msg_target;
1527 unsigned int niov = lntmsg->msg_niov;
1528 struct iovec *iov = lntmsg->msg_iov;
1529 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1530 unsigned int offset = lntmsg->msg_offset;
1531 unsigned int nob = lntmsg->msg_len;
1535 tx = kiblnd_get_idle_tx(ni);
1537 CERROR("Can't get tx for REPLY to %s\n",
1538 libcfs_nid2str(target.nid));
1544 else if (kiov == NULL)
1545 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1546 niov, iov, offset, nob);
1548 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1549 niov, kiov, offset, nob);
1552 CERROR("Can't setup GET src for %s: %d\n",
1553 libcfs_nid2str(target.nid), rc);
1557 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1558 IBLND_MSG_GET_DONE, nob,
1559 &rx->rx_msg->ibm_u.get.ibgm_rd,
1560 rx->rx_msg->ibm_u.get.ibgm_cookie);
1562 CERROR("Can't setup rdma for GET from %s: %d\n",
1563 libcfs_nid2str(target.nid), rc);
1568 /* No RDMA: local completion may happen now! */
1569 lnet_finalize(ni, lntmsg, 0);
1571 /* RDMA: lnet_finalize(lntmsg) when it
1573 tx->tx_lntmsg[0] = lntmsg;
1576 kiblnd_queue_tx(tx, rx->rx_conn);
1580 kiblnd_tx_done(ni, tx);
1582 lnet_finalize(ni, lntmsg, -EIO);
1586 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1587 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1588 unsigned int offset, unsigned int mlen, unsigned int rlen)
1590 kib_rx_t *rx = private;
1591 kib_msg_t *rxmsg = rx->rx_msg;
1592 kib_conn_t *conn = rx->rx_conn;
1596 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1599 LASSERT (mlen <= rlen);
1600 LASSERT (!in_interrupt());
1601 /* Either all pages or all vaddrs */
1602 LASSERT (!(kiov != NULL && iov != NULL));
1604 switch (rxmsg->ibm_type) {
1608 case IBLND_MSG_IMMEDIATE:
1609 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1610 if (nob > rx->rx_nob) {
1611 CERROR ("Immediate message from %s too big: %d(%d)\n",
1612 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1619 lnet_copy_flat2kiov(niov, kiov, offset,
1620 IBLND_MSG_SIZE, rxmsg,
1621 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1624 lnet_copy_flat2iov(niov, iov, offset,
1625 IBLND_MSG_SIZE, rxmsg,
1626 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1628 lnet_finalize (ni, lntmsg, 0);
1631 case IBLND_MSG_PUT_REQ:
1633 lnet_finalize(ni, lntmsg, 0);
1634 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1635 rxmsg->ibm_u.putreq.ibprm_cookie);
1639 tx = kiblnd_get_idle_tx(ni);
1641 CERROR("Can't allocate tx for %s\n",
1642 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1643 /* Not replying will break the connection */
1650 rc = kiblnd_setup_rd_iov(ni, tx,
1651 &txmsg->ibm_u.putack.ibpam_rd,
1652 niov, iov, offset, mlen);
1654 rc = kiblnd_setup_rd_kiov(ni, tx,
1655 &txmsg->ibm_u.putack.ibpam_rd,
1656 niov, kiov, offset, mlen);
1658 CERROR("Can't setup PUT sink for %s: %d\n",
1659 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1660 kiblnd_tx_done(ni, tx);
1661 /* tell peer it's over */
1662 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1663 rxmsg->ibm_u.putreq.ibprm_cookie);
1667 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1668 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1669 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1671 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1673 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1674 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1675 kiblnd_queue_tx(tx, conn);
1677 /* reposted buffer reserved for PUT_DONE */
1678 post_credit = IBLND_POSTRX_NO_CREDIT;
1681 case IBLND_MSG_GET_REQ:
1682 if (lntmsg != NULL) {
1683 /* Optimized GET; RDMA lntmsg's payload */
1684 kiblnd_reply(ni, rx, lntmsg);
1686 /* GET didn't match anything */
1687 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1689 rxmsg->ibm_u.get.ibgm_cookie);
1694 kiblnd_post_rx(rx, post_credit);
1699 kiblnd_thread_start (int (*fn)(void *arg), void *arg)
1701 long pid = kernel_thread (fn, arg, 0);
1706 atomic_inc (&kiblnd_data.kib_nthreads);
1711 kiblnd_thread_fini (void)
1713 atomic_dec (&kiblnd_data.kib_nthreads);
1717 kiblnd_peer_alive (kib_peer_t *peer)
1719 /* This is racy, but everyone's only writing cfs_time_current() */
1720 peer->ibp_last_alive = cfs_time_current();
1725 kiblnd_peer_notify (kib_peer_t *peer)
1727 time_t last_alive = 0;
1729 unsigned long flags;
1731 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1733 if (list_empty(&peer->ibp_conns) &&
1734 peer->ibp_accepting == 0 &&
1735 peer->ibp_connecting == 0 &&
1736 peer->ibp_error != 0) {
1737 error = peer->ibp_error;
1738 peer->ibp_error = 0;
1740 last_alive = cfs_time_current_sec() -
1741 cfs_duration_sec(cfs_time_current() -
1742 peer->ibp_last_alive);
1745 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1748 lnet_notify(peer->ibp_ni,
1749 peer->ibp_nid, 0, last_alive);
1753 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1755 /* This just does the immediate housekeeping. 'error' is zero for a
1756 * normal shutdown which can happen only after the connection has been
1757 * established. If the connection is established, schedule the
1758 * connection to be finished off by the connd. Otherwise the connd is
1759 * already dealing with it (either to set it up or tear it down).
1760 * Caller holds kib_global_lock exclusively in irq context */
1761 unsigned long flags;
1762 kib_peer_t *peer = conn->ibc_peer;
1764 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1766 if (error != 0 && conn->ibc_comms_error == 0)
1767 conn->ibc_comms_error = error;
1769 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1770 return; /* already being handled */
1773 list_empty(&conn->ibc_tx_queue) &&
1774 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1775 list_empty(&conn->ibc_tx_queue_nocred) &&
1776 list_empty(&conn->ibc_active_txs)) {
1777 CDEBUG(D_NET, "closing conn to %s\n",
1778 libcfs_nid2str(peer->ibp_nid));
1780 CDEBUG(D_NETERROR, "Closing conn to %s: error %d%s%s%s%s\n",
1781 libcfs_nid2str(peer->ibp_nid), error,
1782 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1783 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1784 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1785 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1788 list_del(&conn->ibc_list);
1789 /* connd (see below) takes over ibc_list's ref */
1791 if (list_empty (&peer->ibp_conns) && /* no more conns */
1792 kiblnd_peer_active(peer)) { /* still in peer table */
1793 kiblnd_unlink_peer_locked(peer);
1795 /* set/clear error on last conn */
1796 peer->ibp_error = conn->ibc_comms_error;
1799 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1801 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1803 list_add_tail (&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1804 wake_up (&kiblnd_data.kib_connd_waitq);
1806 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1810 kiblnd_close_conn (kib_conn_t *conn, int error)
1812 unsigned long flags;
1814 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1816 kiblnd_close_conn_locked(conn, error);
1818 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1822 kiblnd_handle_early_rxs(kib_conn_t *conn)
1824 unsigned long flags;
1827 LASSERT (!in_interrupt());
1828 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1830 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1831 while (!list_empty(&conn->ibc_early_rxs)) {
1832 rx = list_entry(conn->ibc_early_rxs.next,
1834 list_del(&rx->rx_list);
1835 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1837 kiblnd_handle_rx(rx);
1839 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1841 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1845 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1847 LIST_HEAD (zombies);
1848 struct list_head *tmp;
1849 struct list_head *nxt;
1852 spin_lock(&conn->ibc_lock);
1854 list_for_each_safe (tmp, nxt, txs) {
1855 tx = list_entry (tmp, kib_tx_t, tx_list);
1857 if (txs == &conn->ibc_active_txs) {
1858 LASSERT (!tx->tx_queued);
1859 LASSERT (tx->tx_waiting ||
1860 tx->tx_sending != 0);
1862 LASSERT (tx->tx_queued);
1865 tx->tx_status = -ECONNABORTED;
1868 if (tx->tx_sending == 0) {
1870 list_del (&tx->tx_list);
1871 list_add (&tx->tx_list, &zombies);
1875 spin_unlock(&conn->ibc_lock);
1877 kiblnd_txlist_done(conn->ibc_peer->ibp_ni,
1878 &zombies, -ECONNABORTED);
1882 kiblnd_finalise_conn (kib_conn_t *conn)
1884 LASSERT (!in_interrupt());
1885 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
1887 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
1889 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
1890 * for connections that didn't get as far as being connected, because
1891 * rdma_disconnect() does this for free. */
1892 kiblnd_abort_receives(conn);
1894 /* Complete all tx descs not waiting for sends to complete.
1895 * NB we should be safe from RDMA now that the QP has changed state */
1897 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
1898 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
1899 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
1900 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
1902 kiblnd_handle_early_rxs(conn);
1906 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
1908 LIST_HEAD (zombies);
1909 unsigned long flags;
1911 LASSERT (error != 0);
1912 LASSERT (!in_interrupt());
1914 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1917 LASSERT (peer->ibp_connecting > 0);
1918 peer->ibp_connecting--;
1920 LASSERT (peer->ibp_accepting > 0);
1921 peer->ibp_accepting--;
1924 if (peer->ibp_connecting != 0 ||
1925 peer->ibp_accepting != 0) {
1926 /* another connection attempt under way... */
1927 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1931 if (list_empty(&peer->ibp_conns)) {
1932 /* Take peer's blocked transmits to complete with error */
1933 list_add(&zombies, &peer->ibp_tx_queue);
1934 list_del_init(&peer->ibp_tx_queue);
1936 if (kiblnd_peer_active(peer))
1937 kiblnd_unlink_peer_locked(peer);
1939 peer->ibp_error = error;
1941 /* Can't have blocked transmits if there are connections */
1942 LASSERT (list_empty(&peer->ibp_tx_queue));
1945 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1947 kiblnd_peer_notify(peer);
1949 if (list_empty (&zombies))
1952 CDEBUG (D_NETERROR, "Deleting messages for %s: connection failed\n",
1953 libcfs_nid2str(peer->ibp_nid));
1955 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
1959 kiblnd_connreq_done(kib_conn_t *conn, int status)
1961 kib_peer_t *peer = conn->ibc_peer;
1963 struct list_head txs;
1964 unsigned long flags;
1967 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
1969 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
1970 libcfs_nid2str(peer->ibp_nid), active,
1971 conn->ibc_version, status);
1973 LASSERT (!in_interrupt());
1974 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
1975 peer->ibp_connecting > 0) ||
1976 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
1977 peer->ibp_accepting > 0));
1979 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
1980 conn->ibc_connvars = NULL;
1983 /* failed to establish connection */
1984 kiblnd_peer_connect_failed(peer, active, status);
1985 kiblnd_finalise_conn(conn);
1989 /* connection established */
1990 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1992 conn->ibc_last_send = jiffies;
1993 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
1994 kiblnd_peer_alive(peer);
1996 /* Add conn to peer's list and nuke any dangling conns from a different
1997 * peer instance... */
1998 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
1999 list_add(&conn->ibc_list, &peer->ibp_conns);
2001 peer->ibp_connecting--;
2003 peer->ibp_accepting--;
2005 if (peer->ibp_version == 0) {
2006 peer->ibp_version = conn->ibc_version;
2007 peer->ibp_incarnation = conn->ibc_incarnation;
2010 if (peer->ibp_version != conn->ibc_version ||
2011 peer->ibp_incarnation != conn->ibc_incarnation) {
2012 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2013 conn->ibc_incarnation);
2014 peer->ibp_version = conn->ibc_version;
2015 peer->ibp_incarnation = conn->ibc_incarnation;
2018 /* grab pending txs while I have the lock */
2019 list_add(&txs, &peer->ibp_tx_queue);
2020 list_del_init(&peer->ibp_tx_queue);
2022 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2023 conn->ibc_comms_error != 0) { /* error has happened already */
2024 lnet_ni_t *ni = peer->ibp_ni;
2026 /* start to shut down connection */
2027 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2028 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2030 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2035 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2037 /* Schedule blocked txs */
2038 spin_lock (&conn->ibc_lock);
2039 while (!list_empty (&txs)) {
2040 tx = list_entry (txs.next, kib_tx_t, tx_list);
2041 list_del(&tx->tx_list);
2043 kiblnd_queue_tx_locked(tx, conn);
2045 spin_unlock (&conn->ibc_lock);
2047 kiblnd_check_sends(conn);
2049 /* schedule blocked rxs */
2050 kiblnd_handle_early_rxs(conn);
2054 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2058 rc = rdma_reject(cmid, rej, sizeof(*rej));
2061 CWARN("Error %d sending reject\n", rc);
2065 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2067 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2068 kib_msg_t *reqmsg = priv;
2074 lnet_ni_t *ni = NULL;
2075 kib_net_t *net = NULL;
2077 struct rdma_conn_param cp;
2079 int version = IBLND_MSG_VERSION;
2080 unsigned long flags;
2083 LASSERT (!in_interrupt());
2085 /* cmid inherits 'context' from the corresponding listener id */
2086 ibdev = (kib_dev_t *)cmid->context;
2087 LASSERT (ibdev != NULL);
2089 memset(&rej, 0, sizeof(rej));
2090 rej.ibr_magic = IBLND_MSG_MAGIC;
2091 rej.ibr_why = IBLND_REJECT_FATAL;
2092 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2094 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2095 CERROR("Short connection request\n");
2099 /* Future protocol version compatibility support! If the
2100 * o2iblnd-specific protocol changes, or when LNET unifies
2101 * protocols over all LNDs, the initial connection will
2102 * negotiate a protocol version. I trap this here to avoid
2103 * console errors; the reject tells the peer which protocol I
2105 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2106 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2108 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2109 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2110 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2112 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2113 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2114 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2117 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2119 CERROR("Can't parse connection request: %d\n", rc);
2123 nid = reqmsg->ibm_srcnid;
2124 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2127 net = (kib_net_t *)ni->ni_data;
2128 rej.ibr_incarnation = net->ibn_incarnation;
2131 if (ni == NULL || /* no matching net */
2132 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2133 net->ibn_dev != ibdev) { /* wrong device */
2134 CERROR("Can't accept %s on %s (%s:%d:%u.%u.%u.%u): "
2135 "bad dst nid %s\n", libcfs_nid2str(nid),
2136 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2137 ibdev->ibd_ifname, ibdev->ibd_nnets,
2138 HIPQUAD(ibdev->ibd_ifip),
2139 libcfs_nid2str(reqmsg->ibm_dstnid));
2144 /* check time stamp as soon as possible */
2145 if (reqmsg->ibm_dststamp != 0 &&
2146 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2147 CWARN("Stale connection request\n");
2148 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2152 /* I can accept peer's version */
2153 version = reqmsg->ibm_version;
2155 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2156 CERROR("Unexpected connreq msg type: %x from %s\n",
2157 reqmsg->ibm_type, libcfs_nid2str(nid));
2161 if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2162 IBLND_MSG_QUEUE_SIZE(version)) {
2163 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2164 libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2165 IBLND_MSG_QUEUE_SIZE(version));
2167 if (version == IBLND_MSG_VERSION)
2168 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2173 if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2174 IBLND_RDMA_FRAGS(version)) {
2175 CERROR("Can't accept %s(version %x): "
2176 "incompatible max_frags %d (%d wanted)\n",
2177 libcfs_nid2str(nid), version,
2178 reqmsg->ibm_u.connparams.ibcp_max_frags,
2179 IBLND_RDMA_FRAGS(version));
2181 if (version == IBLND_MSG_VERSION)
2182 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2188 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2189 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2190 libcfs_nid2str(nid),
2191 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2196 /* assume 'nid' is a new peer; create */
2197 rc = kiblnd_create_peer(ni, &peer, nid);
2199 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2200 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2204 write_lock_irqsave(g_lock, flags);
2206 peer2 = kiblnd_find_peer_locked(nid);
2207 if (peer2 != NULL) {
2208 if (peer2->ibp_version == 0) {
2209 peer2->ibp_version = version;
2210 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2213 /* not the guy I've talked with */
2214 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2215 peer2->ibp_version != version) {
2216 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2217 write_unlock_irqrestore(g_lock, flags);
2219 CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2220 libcfs_nid2str(nid), peer2->ibp_version, version);
2222 kiblnd_peer_decref(peer);
2223 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2227 /* tie-break connection race in favour of the higher NID */
2228 if (peer2->ibp_connecting != 0 &&
2230 write_unlock_irqrestore(g_lock, flags);
2232 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2234 kiblnd_peer_decref(peer);
2235 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2239 peer2->ibp_accepting++;
2240 kiblnd_peer_addref(peer2);
2242 write_unlock_irqrestore(g_lock, flags);
2243 kiblnd_peer_decref(peer);
2246 /* Brand new peer */
2247 LASSERT (peer->ibp_accepting == 0);
2248 LASSERT (peer->ibp_version == 0 &&
2249 peer->ibp_incarnation == 0);
2251 peer->ibp_accepting = 1;
2252 peer->ibp_version = version;
2253 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2255 /* I have a ref on ni that prevents it being shutdown */
2256 LASSERT (net->ibn_shutdown == 0);
2258 kiblnd_peer_addref(peer);
2259 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2261 write_unlock_irqrestore(g_lock, flags);
2264 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2266 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2267 kiblnd_peer_decref(peer);
2268 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2272 /* conn now "owns" cmid, so I return success from here on to ensure the
2273 * CM callback doesn't destroy cmid. */
2275 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2276 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE(version);
2277 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2278 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2279 <= IBLND_RX_MSGS(version));
2281 ackmsg = &conn->ibc_connvars->cv_msg;
2282 memset(ackmsg, 0, sizeof(*ackmsg));
2284 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2285 sizeof(ackmsg->ibm_u.connparams));
2286 ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2287 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2288 ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2290 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2292 memset(&cp, 0, sizeof(cp));
2293 cp.private_data = ackmsg;
2294 cp.private_data_len = ackmsg->ibm_nob;
2295 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2296 cp.initiator_depth = 0;
2297 cp.flow_control = 1;
2298 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2299 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2301 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2303 rc = rdma_accept(cmid, &cp);
2305 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2306 rej.ibr_version = version;
2307 rej.ibr_why = IBLND_REJECT_FATAL;
2309 kiblnd_reject(cmid, &rej);
2310 kiblnd_connreq_done(conn, rc);
2311 kiblnd_conn_decref(conn);
2321 rej.ibr_version = version;
2322 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2323 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2324 kiblnd_reject(cmid, &rej);
2326 return -ECONNREFUSED;
2330 kiblnd_reconnect (kib_conn_t *conn, int version,
2331 __u64 incarnation, int why, kib_connparams_t *cp)
2333 kib_peer_t *peer = conn->ibc_peer;
2336 unsigned long flags;
2338 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2339 LASSERT (peer->ibp_connecting > 0); /* 'conn' at least */
2341 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2343 /* retry connection if it's still needed and no other connection
2344 * attempts (active or passive) are in progress */
2345 if (!list_empty(&peer->ibp_tx_queue) &&
2346 peer->ibp_connecting == 1 &&
2347 peer->ibp_accepting == 0) {
2349 peer->ibp_connecting++;
2351 peer->ibp_version = version;
2352 peer->ibp_incarnation = incarnation;
2355 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2365 case IBLND_REJECT_CONN_STALE:
2369 case IBLND_REJECT_CONN_RACE:
2370 reason = "conn race";
2373 case IBLND_REJECT_CONN_UNCOMPAT:
2374 reason = "version negotiation";
2378 CDEBUG(D_NETERROR, "%s: retrying (%s), %x, %x, "
2379 "queue_dep: %d, max_frag: %d, msg_size: %d\n",
2380 libcfs_nid2str(peer->ibp_nid),
2381 reason, IBLND_MSG_VERSION, version,
2382 cp != NULL ? cp->ibcp_queue_depth : IBLND_MSG_QUEUE_SIZE(version),
2383 cp != NULL ? cp->ibcp_max_frags : IBLND_RDMA_FRAGS(version),
2384 cp != NULL ? cp->ibcp_max_msg_size: IBLND_MSG_SIZE);
2386 kiblnd_connect_peer(peer);
2390 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2392 kib_peer_t *peer = conn->ibc_peer;
2394 LASSERT (!in_interrupt());
2395 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2398 case IB_CM_REJ_STALE_CONN:
2399 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2400 IBLND_REJECT_CONN_STALE, NULL);
2403 case IB_CM_REJ_INVALID_SERVICE_ID:
2404 CDEBUG(D_NETERROR, "%s rejected: no listener at %d\n",
2405 libcfs_nid2str(peer->ibp_nid),
2406 *kiblnd_tunables.kib_service);
2409 case IB_CM_REJ_CONSUMER_DEFINED:
2410 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2411 kib_rej_t *rej = priv;
2412 kib_connparams_t *cp = NULL;
2414 __u64 incarnation = -1;
2416 /* NB. default incarnation is -1 because:
2417 * a) V1 will ignore dst incarnation in connreq.
2418 * b) V2 will provide incarnation while rejecting me,
2419 * -1 will be overwrote.
2421 * if I try to connect to a V1 peer with V2 protocol,
2422 * it rejected me then upgrade to V2, I have no idea
2423 * about the upgrading and try to reconnect with V1,
2424 * in this case upgraded V2 can find out I'm trying to
2425 * talk to the old guy and reject me(incarnation is -1).
2428 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2429 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2430 __swab32s(&rej->ibr_magic);
2431 __swab16s(&rej->ibr_version);
2435 if (priv_nob >= sizeof(kib_rej_t) &&
2436 rej->ibr_version > IBLND_MSG_VERSION_1) {
2437 /* priv_nob is always 148 in current version
2438 * of OFED, so we still need to check version.
2439 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2443 __swab64s(&rej->ibr_incarnation);
2444 __swab16s(&cp->ibcp_queue_depth);
2445 __swab16s(&cp->ibcp_max_frags);
2446 __swab32s(&cp->ibcp_max_msg_size);
2449 incarnation = rej->ibr_incarnation;
2452 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2453 rej->ibr_magic != LNET_PROTO_MAGIC) {
2454 CERROR("%s rejected: consumer defined fatal error\n",
2455 libcfs_nid2str(peer->ibp_nid));
2459 if (rej->ibr_version != IBLND_MSG_VERSION &&
2460 rej->ibr_version != IBLND_MSG_VERSION_1) {
2461 CERROR("%s rejected: o2iblnd version %x error\n",
2462 libcfs_nid2str(peer->ibp_nid),
2467 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2468 rej->ibr_version == IBLND_MSG_VERSION_1) {
2469 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2470 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2472 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2473 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2476 switch (rej->ibr_why) {
2477 case IBLND_REJECT_CONN_RACE:
2478 case IBLND_REJECT_CONN_STALE:
2479 case IBLND_REJECT_CONN_UNCOMPAT:
2480 kiblnd_reconnect(conn, rej->ibr_version,
2481 incarnation, rej->ibr_why, cp);
2484 case IBLND_REJECT_MSG_QUEUE_SIZE:
2485 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2486 libcfs_nid2str(peer->ibp_nid), cp->ibcp_queue_depth,
2487 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2490 case IBLND_REJECT_RDMA_FRAGS:
2491 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2492 libcfs_nid2str(peer->ibp_nid), cp->ibcp_max_frags,
2493 IBLND_RDMA_FRAGS(conn->ibc_version));
2496 case IBLND_REJECT_NO_RESOURCES:
2497 CERROR("%s rejected: o2iblnd no resources\n",
2498 libcfs_nid2str(peer->ibp_nid));
2501 case IBLND_REJECT_FATAL:
2502 CERROR("%s rejected: o2iblnd fatal error\n",
2503 libcfs_nid2str(peer->ibp_nid));
2507 CERROR("%s rejected: o2iblnd reason %d\n",
2508 libcfs_nid2str(peer->ibp_nid),
2516 CDEBUG(D_NETERROR, "%s rejected: reason %d, size %d\n",
2517 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2521 kiblnd_connreq_done(conn, -ECONNREFUSED);
2525 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2527 kib_peer_t *peer = conn->ibc_peer;
2528 lnet_ni_t *ni = peer->ibp_ni;
2529 kib_net_t *net = ni->ni_data;
2530 kib_msg_t *msg = priv;
2531 int ver = conn->ibc_version;
2532 int rc = kiblnd_unpack_msg(msg, priv_nob);
2533 unsigned long flags;
2535 LASSERT (net != NULL);
2538 CERROR("Can't unpack connack from %s: %d\n",
2539 libcfs_nid2str(peer->ibp_nid), rc);
2543 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2544 CERROR("Unexpected message %d from %s\n",
2545 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2550 if (ver != msg->ibm_version) {
2551 CERROR("%s replied version %x is different with "
2552 "requested version %x\n",
2553 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2558 if (msg->ibm_u.connparams.ibcp_queue_depth !=
2559 IBLND_MSG_QUEUE_SIZE(ver)) {
2560 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2561 libcfs_nid2str(peer->ibp_nid),
2562 msg->ibm_u.connparams.ibcp_queue_depth,
2563 IBLND_MSG_QUEUE_SIZE(ver));
2568 if (msg->ibm_u.connparams.ibcp_max_frags !=
2569 IBLND_RDMA_FRAGS(ver)) {
2570 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2571 libcfs_nid2str(peer->ibp_nid),
2572 msg->ibm_u.connparams.ibcp_max_frags,
2573 IBLND_RDMA_FRAGS(ver));
2578 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2579 CERROR("%s max message size %d too big (%d max)\n",
2580 libcfs_nid2str(peer->ibp_nid),
2581 msg->ibm_u.connparams.ibcp_max_msg_size,
2587 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2588 if (msg->ibm_dstnid == ni->ni_nid &&
2589 msg->ibm_dststamp == net->ibn_incarnation)
2593 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2596 CERROR("Bad connection reply from %s, rc = %d, "
2597 "version: %x max_frags: %d\n",
2598 libcfs_nid2str(peer->ibp_nid), rc,
2599 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2603 conn->ibc_incarnation = msg->ibm_srcstamp;
2605 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2606 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2607 <= IBLND_RX_MSGS(ver));
2609 kiblnd_connreq_done(conn, 0);
2613 /* NB My QP has already established itself, so I handle anything going
2614 * wrong here by setting ibc_comms_error.
2615 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2616 * immediately tears it down. */
2619 conn->ibc_comms_error = rc;
2620 kiblnd_connreq_done(conn, 0);
2624 kiblnd_active_connect (struct rdma_cm_id *cmid)
2626 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2629 struct rdma_conn_param cp;
2632 unsigned long flags;
2635 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2637 incarnation = peer->ibp_incarnation;
2638 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION : peer->ibp_version;
2640 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2642 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2644 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2645 kiblnd_peer_decref(peer); /* lose cmid's ref */
2649 /* conn "owns" cmid now, so I return success from here on to ensure the
2650 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2653 msg = &conn->ibc_connvars->cv_msg;
2655 memset(msg, 0, sizeof(*msg));
2656 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2657 msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2658 msg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2659 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2661 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2662 0, peer->ibp_nid, incarnation);
2664 memset(&cp, 0, sizeof(cp));
2665 cp.private_data = msg;
2666 cp.private_data_len = msg->ibm_nob;
2667 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2668 cp.initiator_depth = 0;
2669 cp.flow_control = 1;
2670 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2671 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2673 LASSERT(cmid->context == (void *)conn);
2674 LASSERT(conn->ibc_cmid == cmid);
2676 rc = rdma_connect(cmid, &cp);
2678 CERROR("Can't connect to %s: %d\n",
2679 libcfs_nid2str(peer->ibp_nid), rc);
2680 kiblnd_connreq_done(conn, rc);
2681 kiblnd_conn_decref(conn);
2688 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2694 switch (event->event) {
2696 CERROR("Unexpected event: %d, status: %d\n",
2697 event->event, event->status);
2700 case RDMA_CM_EVENT_CONNECT_REQUEST:
2701 /* destroy cmid on failure */
2702 rc = kiblnd_passive_connect(cmid,
2703 (void *)KIBLND_CONN_PARAM(event),
2704 KIBLND_CONN_PARAM_LEN(event));
2705 CDEBUG(D_NET, "connreq: %d\n", rc);
2708 case RDMA_CM_EVENT_ADDR_ERROR:
2709 peer = (kib_peer_t *)cmid->context;
2710 CDEBUG(D_NETERROR, "%s: ADDR ERROR %d\n",
2711 libcfs_nid2str(peer->ibp_nid), event->status);
2712 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2713 kiblnd_peer_decref(peer);
2714 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2716 case RDMA_CM_EVENT_ADDR_RESOLVED:
2717 peer = (kib_peer_t *)cmid->context;
2719 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2720 libcfs_nid2str(peer->ibp_nid), event->status);
2722 if (event->status != 0) {
2723 CDEBUG(D_NETERROR, "Can't resolve address for %s: %d\n",
2724 libcfs_nid2str(peer->ibp_nid), event->status);
2727 rc = rdma_resolve_route(
2728 cmid, *kiblnd_tunables.kib_timeout * 1000);
2731 /* Can't initiate route resolution */
2732 CERROR("Can't resolve route for %s: %d\n",
2733 libcfs_nid2str(peer->ibp_nid), rc);
2735 kiblnd_peer_connect_failed(peer, 1, rc);
2736 kiblnd_peer_decref(peer);
2737 return rc; /* rc != 0 destroys cmid */
2739 case RDMA_CM_EVENT_ROUTE_ERROR:
2740 peer = (kib_peer_t *)cmid->context;
2741 CDEBUG(D_NETERROR, "%s: ROUTE ERROR %d\n",
2742 libcfs_nid2str(peer->ibp_nid), event->status);
2743 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2744 kiblnd_peer_decref(peer);
2745 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2747 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2748 peer = (kib_peer_t *)cmid->context;
2749 CDEBUG(D_NET,"%s Route resolved: %d\n",
2750 libcfs_nid2str(peer->ibp_nid), event->status);
2752 if (event->status == 0)
2753 return kiblnd_active_connect(cmid);
2755 CDEBUG(D_NETERROR, "Can't resolve route for %s: %d\n",
2756 libcfs_nid2str(peer->ibp_nid), event->status);
2757 kiblnd_peer_connect_failed(peer, 1, event->status);
2758 kiblnd_peer_decref(peer);
2759 return event->status; /* rc != 0 destroys cmid */
2761 case RDMA_CM_EVENT_UNREACHABLE:
2762 conn = (kib_conn_t *)cmid->context;
2763 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2764 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2765 CDEBUG(D_NETERROR, "%s: UNREACHABLE %d\n",
2766 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2767 kiblnd_connreq_done(conn, -ENETDOWN);
2768 kiblnd_conn_decref(conn);
2771 case RDMA_CM_EVENT_CONNECT_ERROR:
2772 conn = (kib_conn_t *)cmid->context;
2773 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2774 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2775 CDEBUG(D_NETERROR, "%s: CONNECT ERROR %d\n",
2776 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2777 kiblnd_connreq_done(conn, -ENOTCONN);
2778 kiblnd_conn_decref(conn);
2781 case RDMA_CM_EVENT_REJECTED:
2782 conn = (kib_conn_t *)cmid->context;
2783 switch (conn->ibc_state) {
2787 case IBLND_CONN_PASSIVE_WAIT:
2788 CERROR ("%s: REJECTED %d\n",
2789 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2791 kiblnd_connreq_done(conn, -ECONNRESET);
2794 case IBLND_CONN_ACTIVE_CONNECT:
2795 kiblnd_rejected(conn, event->status,
2796 (void *)KIBLND_CONN_PARAM(event),
2797 KIBLND_CONN_PARAM_LEN(event));
2800 kiblnd_conn_decref(conn);
2803 case RDMA_CM_EVENT_ESTABLISHED:
2804 conn = (kib_conn_t *)cmid->context;
2805 switch (conn->ibc_state) {
2809 case IBLND_CONN_PASSIVE_WAIT:
2810 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2811 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2812 kiblnd_connreq_done(conn, 0);
2815 case IBLND_CONN_ACTIVE_CONNECT:
2816 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2817 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2818 kiblnd_check_connreply(conn,
2819 (void *)KIBLND_CONN_PARAM(event),
2820 KIBLND_CONN_PARAM_LEN(event));
2823 /* net keeps its ref on conn! */
2826 #ifdef HAVE_OFED_RDMA_CMEV_TIMEWAIT_EXIT
2827 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2828 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
2831 case RDMA_CM_EVENT_DISCONNECTED:
2832 conn = (kib_conn_t *)cmid->context;
2833 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2834 CERROR("%s DISCONNECTED\n",
2835 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2836 kiblnd_connreq_done(conn, -ECONNRESET);
2838 kiblnd_close_conn(conn, 0);
2840 kiblnd_conn_decref(conn);
2841 cmid->context = NULL;
2844 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2845 LCONSOLE_ERROR_MSG(0x131,
2846 "Received notification of device removal\n"
2847 "Please shutdown LNET to allow this to proceed\n");
2848 /* Can't remove network from underneath LNET for now, so I have
2852 #ifdef HAVE_OFED_RDMA_CMEV_ADDRCHANGE
2853 case RDMA_CM_EVENT_ADDR_CHANGE:
2854 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
2861 kiblnd_check_txs (kib_conn_t *conn, struct list_head *txs)
2864 struct list_head *ttmp;
2867 spin_lock(&conn->ibc_lock);
2869 list_for_each (ttmp, txs) {
2870 tx = list_entry (ttmp, kib_tx_t, tx_list);
2872 if (txs != &conn->ibc_active_txs) {
2873 LASSERT (tx->tx_queued);
2875 LASSERT (!tx->tx_queued);
2876 LASSERT (tx->tx_waiting || tx->tx_sending != 0);
2879 if (time_after_eq (jiffies, tx->tx_deadline)) {
2881 CERROR("Timed out tx: %s, %lu seconds\n",
2882 kiblnd_queue2str(conn, txs),
2883 cfs_duration_sec(jiffies - tx->tx_deadline));
2888 spin_unlock(&conn->ibc_lock);
2893 kiblnd_conn_timed_out (kib_conn_t *conn)
2895 return kiblnd_check_txs(conn, &conn->ibc_tx_queue) ||
2896 kiblnd_check_txs(conn, &conn->ibc_tx_queue_rsrvd) ||
2897 kiblnd_check_txs(conn, &conn->ibc_tx_queue_nocred) ||
2898 kiblnd_check_txs(conn, &conn->ibc_active_txs);
2902 kiblnd_check_conns (int idx)
2904 struct list_head *peers = &kiblnd_data.kib_peers[idx];
2905 struct list_head *ptmp;
2908 struct list_head *ctmp;
2909 unsigned long flags;
2912 /* NB. We expect to have a look at all the peers and not find any
2913 * rdmas to time out, so we just use a shared lock while we
2915 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2917 list_for_each (ptmp, peers) {
2918 peer = list_entry (ptmp, kib_peer_t, ibp_list);
2920 list_for_each (ctmp, &peer->ibp_conns) {
2921 conn = list_entry (ctmp, kib_conn_t, ibc_list);
2923 LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
2925 /* In case we have enough credits to return via a
2926 * NOOP, but there were no non-blocking tx descs
2927 * free to do it last time... */
2928 kiblnd_check_sends(conn);
2930 if (!kiblnd_conn_timed_out(conn))
2933 /* Handle timeout by closing the whole connection. We
2934 * can only be sure RDMA activity has ceased once the
2935 * QP has been modified. */
2937 kiblnd_conn_addref(conn); /* 1 ref for me... */
2939 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2942 CERROR("Timed out RDMA with %s (%lu)\n",
2943 libcfs_nid2str(peer->ibp_nid),
2944 cfs_duration_sec(cfs_time_current() -
2945 peer->ibp_last_alive));
2947 kiblnd_close_conn(conn, -ETIMEDOUT);
2948 kiblnd_conn_decref(conn); /* ...until here */
2950 /* start again now I've dropped the lock */
2955 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2959 kiblnd_disconnect_conn (kib_conn_t *conn)
2961 LASSERT (!in_interrupt());
2962 LASSERT (current == kiblnd_data.kib_connd);
2963 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
2965 rdma_disconnect(conn->ibc_cmid);
2966 kiblnd_finalise_conn(conn);
2968 kiblnd_peer_notify(conn->ibc_peer);
2972 kiblnd_connd (void *arg)
2975 unsigned long flags;
2981 unsigned long deadline = jiffies;
2983 cfs_daemonize ("kiblnd_connd");
2984 cfs_block_allsigs ();
2986 init_waitqueue_entry (&wait, current);
2987 kiblnd_data.kib_connd = current;
2989 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2991 while (!kiblnd_data.kib_shutdown) {
2995 if (!list_empty (&kiblnd_data.kib_connd_zombies)) {
2996 conn = list_entry (kiblnd_data.kib_connd_zombies.next,
2997 kib_conn_t, ibc_list);
2998 list_del(&conn->ibc_list);
3000 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3003 kiblnd_destroy_conn(conn);
3005 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3008 if (!list_empty (&kiblnd_data.kib_connd_conns)) {
3009 conn = list_entry (kiblnd_data.kib_connd_conns.next,
3010 kib_conn_t, ibc_list);
3011 list_del(&conn->ibc_list);
3013 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3016 kiblnd_disconnect_conn(conn);
3017 kiblnd_conn_decref(conn);
3019 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3022 /* careful with the jiffy wrap... */
3023 timeout = (int)(deadline - jiffies);
3027 int chunk = kiblnd_data.kib_peer_hash_size;
3029 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3032 /* Time to check for RDMA timeouts on a few more
3033 * peers: I do checks every 'p' seconds on a
3034 * proportion of the peer table and I need to check
3035 * every connection 'n' times within a timeout
3036 * interval, to ensure I detect a timeout on any
3037 * connection within (n+1)/n times the timeout
3040 if (*kiblnd_tunables.kib_timeout > n * p)
3041 chunk = (chunk * n * p) /
3042 *kiblnd_tunables.kib_timeout;
3046 for (i = 0; i < chunk; i++) {
3047 kiblnd_check_conns(peer_index);
3048 peer_index = (peer_index + 1) %
3049 kiblnd_data.kib_peer_hash_size;
3053 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3059 /* Nothing to do for 'timeout' */
3060 set_current_state (TASK_INTERRUPTIBLE);
3061 add_wait_queue (&kiblnd_data.kib_connd_waitq, &wait);
3062 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3064 schedule_timeout (timeout);
3066 set_current_state (TASK_RUNNING);
3067 remove_wait_queue (&kiblnd_data.kib_connd_waitq, &wait);
3068 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3071 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3073 kiblnd_thread_fini();
3078 kiblnd_qp_event(struct ib_event *event, void *arg)
3080 kib_conn_t *conn = arg;
3082 switch (event->event) {
3083 case IB_EVENT_COMM_EST:
3084 CDEBUG(D_NET, "%s established\n",
3085 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3089 CERROR("%s: Async QP event type %d\n",
3090 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3096 kiblnd_complete (struct ib_wc *wc)
3098 switch (kiblnd_wreqid2type(wc->wr_id)) {
3102 case IBLND_WID_RDMA:
3103 /* We only get RDMA completion notification if it fails. All
3104 * subsequent work items, including the final SEND will fail
3105 * too. However we can't print out any more info about the
3106 * failing RDMA because 'tx' might be back on the idle list or
3107 * even reused already if we didn't manage to post all our work
3109 CDEBUG(D_NETERROR, "RDMA (tx: %p) failed: %d\n",
3110 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3114 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3118 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3125 kiblnd_cq_completion (struct ib_cq *cq, void *arg)
3127 /* NB I'm not allowed to schedule this conn once its refcount has
3128 * reached 0. Since fundamentally I'm racing with scheduler threads
3129 * consuming my CQ I could be called after all completions have
3130 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3131 * and this CQ is about to be destroyed so I NOOP. */
3132 kib_conn_t *conn = (kib_conn_t *)arg;
3133 unsigned long flags;
3135 LASSERT (cq == conn->ibc_cq);
3137 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3139 conn->ibc_ready = 1;
3141 if (!conn->ibc_scheduled &&
3142 (conn->ibc_nrx > 0 ||
3143 conn->ibc_nsends_posted > 0)) {
3144 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3145 conn->ibc_scheduled = 1;
3146 list_add_tail(&conn->ibc_sched_list,
3147 &kiblnd_data.kib_sched_conns);
3148 wake_up(&kiblnd_data.kib_sched_waitq);
3151 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3155 kiblnd_cq_event(struct ib_event *event, void *arg)
3157 kib_conn_t *conn = arg;
3159 CERROR("%s: async CQ event type %d\n",
3160 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3164 kiblnd_scheduler(void *arg)
3166 long id = (long)arg;
3169 unsigned long flags;
3176 snprintf(name, sizeof(name), "kiblnd_sd_%02ld", id);
3177 cfs_daemonize(name);
3178 cfs_block_allsigs();
3180 init_waitqueue_entry(&wait, current);
3182 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3184 while (!kiblnd_data.kib_shutdown) {
3185 if (busy_loops++ >= IBLND_RESCHED) {
3186 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3192 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3197 if (!list_empty(&kiblnd_data.kib_sched_conns)) {
3198 conn = list_entry(kiblnd_data.kib_sched_conns.next,
3199 kib_conn_t, ibc_sched_list);
3200 /* take over kib_sched_conns' ref on conn... */
3201 LASSERT(conn->ibc_scheduled);
3202 list_del(&conn->ibc_sched_list);
3203 conn->ibc_ready = 0;
3205 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3208 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3210 rc = ib_req_notify_cq(conn->ibc_cq,
3213 CWARN("%s: ib_req_notify_cq failed: %d, "
3214 "closing connection\n",
3215 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3216 kiblnd_close_conn(conn, -EIO);
3217 kiblnd_conn_decref(conn);
3218 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3222 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3226 CWARN("%s: ib_poll_cq failed: %d, "
3227 "closing connection\n",
3228 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3229 kiblnd_close_conn(conn, -EIO);
3230 kiblnd_conn_decref(conn);
3231 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3235 spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
3238 if (rc != 0 || conn->ibc_ready) {
3239 /* There may be another completion waiting; get
3240 * another scheduler to check while I handle
3242 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3243 list_add_tail(&conn->ibc_sched_list,
3244 &kiblnd_data.kib_sched_conns);
3245 wake_up(&kiblnd_data.kib_sched_waitq);
3247 conn->ibc_scheduled = 0;
3251 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3254 kiblnd_complete(&wc);
3256 spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
3260 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3267 set_current_state(TASK_INTERRUPTIBLE);
3268 add_wait_queue_exclusive(&kiblnd_data.kib_sched_waitq, &wait);
3269 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3274 remove_wait_queue(&kiblnd_data.kib_sched_waitq, &wait);
3275 set_current_state(TASK_RUNNING);
3276 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3279 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3281 kiblnd_thread_fini();