4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
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10 * This program is distributed in the hope that it will be useful, but
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
34 * lnet/klnds/o2iblnd/o2iblnd_cb.c
36 * Author: Eric Barton <eric@bartonsoftware.com>
42 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
44 lnet_msg_t *lntmsg[2];
45 kib_net_t *net = ni->ni_data;
49 LASSERT (net != NULL);
50 LASSERT (!cfs_in_interrupt());
51 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
52 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
53 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer response */
54 LASSERT (tx->tx_pool != NULL);
56 kiblnd_unmap_tx(ni, tx);
58 /* tx may have up to 2 lnet msgs to finalise */
59 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
60 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
63 if (tx->tx_conn != NULL) {
64 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
66 kiblnd_conn_decref(tx->tx_conn);
73 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
75 /* delay finalize until my descs have been freed */
76 for (i = 0; i < 2; i++) {
77 if (lntmsg[i] == NULL)
80 lnet_finalize(ni, lntmsg[i], rc);
85 kiblnd_txlist_done (lnet_ni_t *ni, cfs_list_t *txlist, int status)
89 while (!cfs_list_empty (txlist)) {
90 tx = cfs_list_entry (txlist->next, kib_tx_t, tx_list);
92 cfs_list_del(&tx->tx_list);
95 tx->tx_status = status;
96 kiblnd_tx_done(ni, tx);
101 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
103 kib_net_t *net = (kib_net_t *)ni->ni_data;
106 kib_tx_poolset_t *tps;
108 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
109 node = kiblnd_pool_alloc_node(&tps->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;
132 struct kib_sched_info *sched = conn->ibc_sched;
135 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
136 LASSERT(conn->ibc_nrx > 0);
138 cfs_spin_unlock_irqrestore(&sched->ibs_lock, flags);
140 kiblnd_conn_decref(conn);
144 kiblnd_post_rx (kib_rx_t *rx, int credit)
146 kib_conn_t *conn = rx->rx_conn;
147 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
148 struct ib_recv_wr *bad_wrq = NULL;
152 LASSERT (net != NULL);
153 LASSERT (!cfs_in_interrupt());
154 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
155 credit == IBLND_POSTRX_PEER_CREDIT ||
156 credit == IBLND_POSTRX_RSRVD_CREDIT);
158 mr = kiblnd_find_dma_mr(conn->ibc_hdev, rx->rx_msgaddr, IBLND_MSG_SIZE);
159 LASSERT (mr != NULL);
161 rx->rx_sge.lkey = mr->lkey;
162 rx->rx_sge.addr = rx->rx_msgaddr;
163 rx->rx_sge.length = IBLND_MSG_SIZE;
165 rx->rx_wrq.next = NULL;
166 rx->rx_wrq.sg_list = &rx->rx_sge;
167 rx->rx_wrq.num_sge = 1;
168 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
170 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
171 LASSERT (rx->rx_nob >= 0); /* not posted */
173 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
174 kiblnd_drop_rx(rx); /* No more posts for this rx */
178 rx->rx_nob = -1; /* flag posted */
180 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
182 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
183 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
187 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
191 kiblnd_close_conn(conn, rc);
192 kiblnd_drop_rx(rx); /* No more posts for this rx */
196 if (credit == IBLND_POSTRX_NO_CREDIT)
199 cfs_spin_lock(&conn->ibc_lock);
200 if (credit == IBLND_POSTRX_PEER_CREDIT)
201 conn->ibc_outstanding_credits++;
203 conn->ibc_reserved_credits++;
204 cfs_spin_unlock(&conn->ibc_lock);
206 kiblnd_check_sends(conn);
211 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
215 cfs_list_for_each(tmp, &conn->ibc_active_txs) {
216 kib_tx_t *tx = cfs_list_entry(tmp, kib_tx_t, tx_list);
218 LASSERT (!tx->tx_queued);
219 LASSERT (tx->tx_sending != 0 || tx->tx_waiting);
221 if (tx->tx_cookie != cookie)
224 if (tx->tx_waiting &&
225 tx->tx_msg->ibm_type == txtype)
228 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
229 tx->tx_waiting ? "" : "NOT ",
230 tx->tx_msg->ibm_type, txtype);
236 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
239 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
242 cfs_spin_lock(&conn->ibc_lock);
244 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
246 cfs_spin_unlock(&conn->ibc_lock);
248 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
249 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
250 kiblnd_close_conn(conn, -EPROTO);
254 if (tx->tx_status == 0) { /* success so far */
255 if (status < 0) { /* failed? */
256 tx->tx_status = status;
257 } else if (txtype == IBLND_MSG_GET_REQ) {
258 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
264 idle = !tx->tx_queued && (tx->tx_sending == 0);
266 cfs_list_del(&tx->tx_list);
268 cfs_spin_unlock(&conn->ibc_lock);
271 kiblnd_tx_done(ni, tx);
275 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
277 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
278 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
281 CERROR("Can't get tx for completion %x for %s\n",
282 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
286 tx->tx_msg->ibm_u.completion.ibcm_status = status;
287 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
288 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
290 kiblnd_queue_tx(tx, conn);
294 kiblnd_handle_rx (kib_rx_t *rx)
296 kib_msg_t *msg = rx->rx_msg;
297 kib_conn_t *conn = rx->rx_conn;
298 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
299 int credits = msg->ibm_credits;
305 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
307 CDEBUG (D_NET, "Received %x[%d] from %s\n",
308 msg->ibm_type, credits,
309 libcfs_nid2str(conn->ibc_peer->ibp_nid));
312 /* Have I received credits that will let me send? */
313 cfs_spin_lock(&conn->ibc_lock);
315 if (conn->ibc_credits + credits >
316 IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
317 rc2 = conn->ibc_credits;
318 cfs_spin_unlock(&conn->ibc_lock);
320 CERROR("Bad credits from %s: %d + %d > %d\n",
321 libcfs_nid2str(conn->ibc_peer->ibp_nid),
323 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
325 kiblnd_close_conn(conn, -EPROTO);
326 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
330 conn->ibc_credits += credits;
332 /* This ensures the credit taken by NOOP can be returned */
333 if (msg->ibm_type == IBLND_MSG_NOOP &&
334 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
335 conn->ibc_outstanding_credits++;
337 cfs_spin_unlock(&conn->ibc_lock);
338 kiblnd_check_sends(conn);
341 switch (msg->ibm_type) {
343 CERROR("Bad IBLND message type %x from %s\n",
344 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
345 post_credit = IBLND_POSTRX_NO_CREDIT;
350 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
351 post_credit = IBLND_POSTRX_NO_CREDIT;
355 if (credits != 0) /* credit already posted */
356 post_credit = IBLND_POSTRX_NO_CREDIT;
357 else /* a keepalive NOOP */
358 post_credit = IBLND_POSTRX_PEER_CREDIT;
361 case IBLND_MSG_IMMEDIATE:
362 post_credit = IBLND_POSTRX_DONT_POST;
363 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
364 msg->ibm_srcnid, rx, 0);
365 if (rc < 0) /* repost on error */
366 post_credit = IBLND_POSTRX_PEER_CREDIT;
369 case IBLND_MSG_PUT_REQ:
370 post_credit = IBLND_POSTRX_DONT_POST;
371 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
372 msg->ibm_srcnid, rx, 1);
373 if (rc < 0) /* repost on error */
374 post_credit = IBLND_POSTRX_PEER_CREDIT;
377 case IBLND_MSG_PUT_NAK:
378 CWARN ("PUT_NACK from %s\n",
379 libcfs_nid2str(conn->ibc_peer->ibp_nid));
380 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
381 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
382 msg->ibm_u.completion.ibcm_status,
383 msg->ibm_u.completion.ibcm_cookie);
386 case IBLND_MSG_PUT_ACK:
387 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
389 cfs_spin_lock(&conn->ibc_lock);
390 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
391 msg->ibm_u.putack.ibpam_src_cookie);
393 cfs_list_del(&tx->tx_list);
394 cfs_spin_unlock(&conn->ibc_lock);
397 CERROR("Unmatched PUT_ACK from %s\n",
398 libcfs_nid2str(conn->ibc_peer->ibp_nid));
403 LASSERT (tx->tx_waiting);
404 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
405 * (a) I can overwrite tx_msg since my peer has received it!
406 * (b) tx_waiting set tells tx_complete() it's not done. */
408 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
410 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
411 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
412 &msg->ibm_u.putack.ibpam_rd,
413 msg->ibm_u.putack.ibpam_dst_cookie);
415 CERROR("Can't setup rdma for PUT to %s: %d\n",
416 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
418 cfs_spin_lock(&conn->ibc_lock);
419 tx->tx_waiting = 0; /* clear waiting and queue atomically */
420 kiblnd_queue_tx_locked(tx, conn);
421 cfs_spin_unlock(&conn->ibc_lock);
424 case IBLND_MSG_PUT_DONE:
425 post_credit = IBLND_POSTRX_PEER_CREDIT;
426 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
427 msg->ibm_u.completion.ibcm_status,
428 msg->ibm_u.completion.ibcm_cookie);
431 case IBLND_MSG_GET_REQ:
432 post_credit = IBLND_POSTRX_DONT_POST;
433 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
434 msg->ibm_srcnid, rx, 1);
435 if (rc < 0) /* repost on error */
436 post_credit = IBLND_POSTRX_PEER_CREDIT;
439 case IBLND_MSG_GET_DONE:
440 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
441 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
442 msg->ibm_u.completion.ibcm_status,
443 msg->ibm_u.completion.ibcm_cookie);
447 if (rc < 0) /* protocol error */
448 kiblnd_close_conn(conn, rc);
450 if (post_credit != IBLND_POSTRX_DONT_POST)
451 kiblnd_post_rx(rx, post_credit);
455 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
457 kib_msg_t *msg = rx->rx_msg;
458 kib_conn_t *conn = rx->rx_conn;
459 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
460 kib_net_t *net = ni->ni_data;
464 LASSERT (net != NULL);
465 LASSERT (rx->rx_nob < 0); /* was posted */
466 rx->rx_nob = 0; /* isn't now */
468 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
471 if (status != IB_WC_SUCCESS) {
472 CNETERR("Rx from %s failed: %d\n",
473 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
480 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
482 CERROR ("Error %d unpacking rx from %s\n",
483 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
487 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
488 msg->ibm_dstnid != ni->ni_nid ||
489 msg->ibm_srcstamp != conn->ibc_incarnation ||
490 msg->ibm_dststamp != net->ibn_incarnation) {
491 CERROR ("Stale rx from %s\n",
492 libcfs_nid2str(conn->ibc_peer->ibp_nid));
497 /* set time last known alive */
498 kiblnd_peer_alive(conn->ibc_peer);
500 /* racing with connection establishment/teardown! */
502 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
503 cfs_rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
506 cfs_write_lock_irqsave(g_lock, flags);
507 /* must check holding global lock to eliminate race */
508 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
509 cfs_list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
510 cfs_write_unlock_irqrestore(g_lock, flags);
513 cfs_write_unlock_irqrestore(g_lock, flags);
515 kiblnd_handle_rx(rx);
519 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
520 kiblnd_close_conn(conn, err);
522 kiblnd_drop_rx(rx); /* Don't re-post rx. */
526 kiblnd_kvaddr_to_page (unsigned long vaddr)
530 if (vaddr >= VMALLOC_START &&
531 vaddr < VMALLOC_END) {
532 page = vmalloc_to_page ((void *)vaddr);
533 LASSERT (page != NULL);
536 #ifdef CONFIG_HIGHMEM
537 if (vaddr >= PKMAP_BASE &&
538 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
539 /* No highmem pages only used for bulk (kiov) I/O */
540 CERROR("find page for address in highmem\n");
544 page = virt_to_page (vaddr);
545 LASSERT (page != NULL);
550 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
552 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
553 __u64 *pages = tx->tx_pages;
554 kib_fmr_poolset_t *fps;
561 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
562 for (size = 0; size < rd->rd_frags[i].rf_nob;
563 size += hdev->ibh_page_size) {
564 pages[npages ++] = (rd->rd_frags[i].rf_addr &
565 hdev->ibh_page_mask) + size;
569 LASSERT(tx->tx_pool != NULL);
570 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
572 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
574 fps = net->ibn_fmr_ps[cpt];
575 rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->tx_u.fmr);
577 CERROR ("Can't map %d pages: %d\n", npages, rc);
581 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
583 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.fmr.fmr_pfmr->fmr->rkey :
584 tx->tx_u.fmr.fmr_pfmr->fmr->lkey;
585 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
586 rd->rd_frags[0].rf_nob = nob;
593 kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
595 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
596 kib_pmr_poolset_t *pps;
601 iova = rd->rd_frags[0].rf_addr & ~hdev->ibh_page_mask;
603 LASSERT(tx->tx_pool != NULL);
604 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
606 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
608 pps = net->ibn_pmr_ps[cpt];
609 rc = kiblnd_pmr_pool_map(pps, hdev, rd, &iova, &tx->tx_u.pmr);
611 CERROR("Failed to create MR by phybuf: %d\n", rc);
615 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
617 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.pmr->pmr_mr->rkey :
618 tx->tx_u.pmr->pmr_mr->lkey;
620 rd->rd_frags[0].rf_addr = iova;
621 rd->rd_frags[0].rf_nob = nob;
627 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
629 kib_net_t *net = ni->ni_data;
631 LASSERT(net != NULL);
633 if (net->ibn_fmr_ps != NULL && tx->tx_u.fmr.fmr_pfmr != NULL) {
634 kiblnd_fmr_pool_unmap(&tx->tx_u.fmr, tx->tx_status);
635 tx->tx_u.fmr.fmr_pfmr = NULL;
637 } else if (net->ibn_pmr_ps != NULL && tx->tx_u.pmr != NULL) {
638 kiblnd_pmr_pool_unmap(tx->tx_u.pmr);
642 if (tx->tx_nfrags != 0) {
643 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
644 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
650 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
651 kib_rdma_desc_t *rd, int nfrags)
653 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
654 kib_net_t *net = ni->ni_data;
655 struct ib_mr *mr = NULL;
659 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
661 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
662 tx->tx_nfrags = nfrags;
665 kiblnd_dma_map_sg(hdev->ibh_ibdev,
666 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
668 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
669 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
670 hdev->ibh_ibdev, &tx->tx_frags[i]);
671 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
672 hdev->ibh_ibdev, &tx->tx_frags[i]);
673 nob += rd->rd_frags[i].rf_nob;
676 /* looking for pre-mapping MR */
677 mr = kiblnd_find_rd_dma_mr(hdev, rd);
679 /* found pre-mapping MR */
680 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
684 if (net->ibn_fmr_ps != NULL)
685 return kiblnd_fmr_map_tx(net, tx, rd, nob);
686 else if (net->ibn_pmr_ps != NULL)
687 return kiblnd_pmr_map_tx(net, tx, rd, nob);
694 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
695 unsigned int niov, struct iovec *iov, int offset, int nob)
697 kib_net_t *net = ni->ni_data;
699 struct scatterlist *sg;
706 LASSERT (net != NULL);
708 while (offset >= iov->iov_len) {
709 offset -= iov->iov_len;
719 vaddr = ((unsigned long)iov->iov_base) + offset;
720 page_offset = vaddr & (PAGE_SIZE - 1);
721 page = kiblnd_kvaddr_to_page(vaddr);
723 CERROR ("Can't find page\n");
727 fragnob = min((int)(iov->iov_len - offset), nob);
728 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
730 sg_set_page(sg, page, fragnob, page_offset);
733 if (offset + fragnob < iov->iov_len) {
743 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
747 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
748 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
750 kib_net_t *net = ni->ni_data;
751 struct scatterlist *sg;
754 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
758 LASSERT (net != NULL);
760 while (offset >= kiov->kiov_len) {
761 offset -= kiov->kiov_len;
771 fragnob = min((int)(kiov->kiov_len - offset), nob);
773 memset(sg, 0, sizeof(*sg));
774 sg_set_page(sg, kiov->kiov_page, fragnob,
775 kiov->kiov_offset + offset);
784 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
788 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
790 kib_msg_t *msg = tx->tx_msg;
791 kib_peer_t *peer = conn->ibc_peer;
792 int ver = conn->ibc_version;
795 struct ib_send_wr *bad_wrq;
797 LASSERT (tx->tx_queued);
798 /* We rely on this for QP sizing */
799 LASSERT (tx->tx_nwrq > 0);
800 LASSERT (tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
802 LASSERT (credit == 0 || credit == 1);
803 LASSERT (conn->ibc_outstanding_credits >= 0);
804 LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
805 LASSERT (conn->ibc_credits >= 0);
806 LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
808 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
809 /* tx completions outstanding... */
810 CDEBUG(D_NET, "%s: posted enough\n",
811 libcfs_nid2str(peer->ibp_nid));
815 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
816 CDEBUG(D_NET, "%s: no credits\n",
817 libcfs_nid2str(peer->ibp_nid));
821 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
822 conn->ibc_credits == 1 && /* last credit reserved */
823 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
824 CDEBUG(D_NET, "%s: not using last credit\n",
825 libcfs_nid2str(peer->ibp_nid));
829 /* NB don't drop ibc_lock before bumping tx_sending */
830 cfs_list_del(&tx->tx_list);
833 if (msg->ibm_type == IBLND_MSG_NOOP &&
834 (!kiblnd_need_noop(conn) || /* redundant NOOP */
835 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
836 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
837 /* OK to drop when posted enough NOOPs, since
838 * kiblnd_check_sends will queue NOOP again when
839 * posted NOOPs complete */
840 cfs_spin_unlock(&conn->ibc_lock);
841 kiblnd_tx_done(peer->ibp_ni, tx);
842 cfs_spin_lock(&conn->ibc_lock);
843 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
844 libcfs_nid2str(peer->ibp_nid),
845 conn->ibc_noops_posted);
849 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
850 peer->ibp_nid, conn->ibc_incarnation);
852 conn->ibc_credits -= credit;
853 conn->ibc_outstanding_credits = 0;
854 conn->ibc_nsends_posted++;
855 if (msg->ibm_type == IBLND_MSG_NOOP)
856 conn->ibc_noops_posted++;
858 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
859 * PUT. If so, it was first queued here as a PUT_REQ, sent and
860 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
861 * and then re-queued here. It's (just) possible that
862 * tx_sending is non-zero if we've not done the tx_complete()
863 * from the first send; hence the ++ rather than = below. */
865 cfs_list_add(&tx->tx_list, &conn->ibc_active_txs);
867 /* I'm still holding ibc_lock! */
868 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
870 } else if (tx->tx_pool->tpo_pool.po_failed ||
871 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
872 /* close_conn will launch failover */
875 rc = ib_post_send(conn->ibc_cmid->qp,
876 tx->tx_wrq, &bad_wrq);
879 conn->ibc_last_send = jiffies;
884 /* NB credits are transferred in the actual
885 * message, which can only be the last work item */
886 conn->ibc_credits += credit;
887 conn->ibc_outstanding_credits += msg->ibm_credits;
888 conn->ibc_nsends_posted--;
889 if (msg->ibm_type == IBLND_MSG_NOOP)
890 conn->ibc_noops_posted--;
896 done = (tx->tx_sending == 0);
898 cfs_list_del(&tx->tx_list);
900 cfs_spin_unlock(&conn->ibc_lock);
902 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
903 CERROR("Error %d posting transmit to %s\n",
904 rc, libcfs_nid2str(peer->ibp_nid));
906 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
907 rc, libcfs_nid2str(peer->ibp_nid));
909 kiblnd_close_conn(conn, rc);
912 kiblnd_tx_done(peer->ibp_ni, tx);
914 cfs_spin_lock(&conn->ibc_lock);
920 kiblnd_check_sends (kib_conn_t *conn)
922 int ver = conn->ibc_version;
923 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
926 /* Don't send anything until after the connection is established */
927 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
928 CDEBUG(D_NET, "%s too soon\n",
929 libcfs_nid2str(conn->ibc_peer->ibp_nid));
933 cfs_spin_lock(&conn->ibc_lock);
935 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
936 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
937 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
938 LASSERT (conn->ibc_reserved_credits >= 0);
940 while (conn->ibc_reserved_credits > 0 &&
941 !cfs_list_empty(&conn->ibc_tx_queue_rsrvd)) {
942 tx = cfs_list_entry(conn->ibc_tx_queue_rsrvd.next,
944 cfs_list_del(&tx->tx_list);
945 cfs_list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
946 conn->ibc_reserved_credits--;
949 if (kiblnd_need_noop(conn)) {
950 cfs_spin_unlock(&conn->ibc_lock);
952 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
954 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
956 cfs_spin_lock(&conn->ibc_lock);
958 kiblnd_queue_tx_locked(tx, conn);
961 kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */
966 if (!cfs_list_empty(&conn->ibc_tx_queue_nocred)) {
968 tx = cfs_list_entry(conn->ibc_tx_queue_nocred.next,
970 } else if (!cfs_list_empty(&conn->ibc_tx_noops)) {
971 LASSERT (!IBLND_OOB_CAPABLE(ver));
973 tx = cfs_list_entry(conn->ibc_tx_noops.next,
975 } else if (!cfs_list_empty(&conn->ibc_tx_queue)) {
977 tx = cfs_list_entry(conn->ibc_tx_queue.next,
982 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
986 cfs_spin_unlock(&conn->ibc_lock);
988 kiblnd_conn_decref(conn); /* ...until here */
992 kiblnd_tx_complete (kib_tx_t *tx, int status)
994 int failed = (status != IB_WC_SUCCESS);
995 kib_conn_t *conn = tx->tx_conn;
998 LASSERT (tx->tx_sending > 0);
1001 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1002 CNETERR("Tx -> %s cookie "LPX64
1003 " sending %d waiting %d: failed %d\n",
1004 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1005 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1008 kiblnd_close_conn(conn, -EIO);
1010 kiblnd_peer_alive(conn->ibc_peer);
1013 cfs_spin_lock(&conn->ibc_lock);
1015 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1016 * gets to free it, which also drops its ref on 'conn'. */
1019 conn->ibc_nsends_posted--;
1020 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1021 conn->ibc_noops_posted--;
1024 tx->tx_waiting = 0; /* don't wait for peer */
1025 tx->tx_status = -EIO;
1028 idle = (tx->tx_sending == 0) && /* This is the final callback */
1029 !tx->tx_waiting && /* Not waiting for peer */
1030 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1032 cfs_list_del(&tx->tx_list);
1034 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1036 cfs_spin_unlock(&conn->ibc_lock);
1039 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1041 kiblnd_check_sends(conn);
1043 kiblnd_conn_decref(conn); /* ...until here */
1047 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1049 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1050 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1051 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1052 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1055 LASSERT (tx->tx_nwrq >= 0);
1056 LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1057 LASSERT (nob <= IBLND_MSG_SIZE);
1059 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1061 mr = kiblnd_find_dma_mr(hdev, tx->tx_msgaddr, nob);
1062 LASSERT (mr != NULL);
1064 sge->lkey = mr->lkey;
1065 sge->addr = tx->tx_msgaddr;
1068 memset(wrq, 0, sizeof(*wrq));
1071 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1074 wrq->opcode = IB_WR_SEND;
1075 wrq->send_flags = IB_SEND_SIGNALED;
1081 kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1082 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1084 kib_msg_t *ibmsg = tx->tx_msg;
1085 kib_rdma_desc_t *srcrd = tx->tx_rd;
1086 struct ib_sge *sge = &tx->tx_sge[0];
1087 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1093 LASSERT (!cfs_in_interrupt());
1094 LASSERT (tx->tx_nwrq == 0);
1095 LASSERT (type == IBLND_MSG_GET_DONE ||
1096 type == IBLND_MSG_PUT_DONE);
1098 srcidx = dstidx = 0;
1101 if (srcidx >= srcrd->rd_nfrags) {
1102 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1107 if (dstidx == dstrd->rd_nfrags) {
1108 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1113 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1114 CERROR("RDMA too fragmented for %s (%d): "
1115 "%d/%d src %d/%d dst frags\n",
1116 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1117 IBLND_RDMA_FRAGS(conn->ibc_version),
1118 srcidx, srcrd->rd_nfrags,
1119 dstidx, dstrd->rd_nfrags);
1124 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1125 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1127 sge = &tx->tx_sge[tx->tx_nwrq];
1128 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1129 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1130 sge->length = wrknob;
1132 wrq = &tx->tx_wrq[tx->tx_nwrq];
1134 wrq->next = wrq + 1;
1135 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1138 wrq->opcode = IB_WR_RDMA_WRITE;
1139 wrq->send_flags = 0;
1141 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1142 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1144 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1145 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1154 if (rc < 0) /* no RDMA if completing with failure */
1157 ibmsg->ibm_u.completion.ibcm_status = rc;
1158 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1159 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1160 type, sizeof (kib_completion_msg_t));
1166 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1170 LASSERT (tx->tx_nwrq > 0); /* work items set up */
1171 LASSERT (!tx->tx_queued); /* not queued for sending already */
1172 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1175 tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * CFS_HZ);
1177 if (tx->tx_conn == NULL) {
1178 kiblnd_conn_addref(conn);
1180 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1182 /* PUT_DONE first attached to conn as a PUT_REQ */
1183 LASSERT (tx->tx_conn == conn);
1184 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1187 switch (tx->tx_msg->ibm_type) {
1191 case IBLND_MSG_PUT_REQ:
1192 case IBLND_MSG_GET_REQ:
1193 q = &conn->ibc_tx_queue_rsrvd;
1196 case IBLND_MSG_PUT_NAK:
1197 case IBLND_MSG_PUT_ACK:
1198 case IBLND_MSG_PUT_DONE:
1199 case IBLND_MSG_GET_DONE:
1200 q = &conn->ibc_tx_queue_nocred;
1203 case IBLND_MSG_NOOP:
1204 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1205 q = &conn->ibc_tx_queue_nocred;
1207 q = &conn->ibc_tx_noops;
1210 case IBLND_MSG_IMMEDIATE:
1211 q = &conn->ibc_tx_queue;
1215 cfs_list_add_tail(&tx->tx_list, q);
1219 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1221 cfs_spin_lock(&conn->ibc_lock);
1222 kiblnd_queue_tx_locked(tx, conn);
1223 cfs_spin_unlock(&conn->ibc_lock);
1225 kiblnd_check_sends(conn);
1228 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1229 struct sockaddr_in *srcaddr,
1230 struct sockaddr_in *dstaddr,
1233 unsigned short port;
1236 #ifdef HAVE_OFED_RDMA_SET_REUSEADDR
1237 /* allow the port to be reused */
1238 rc = rdma_set_reuseaddr(cmid, 1);
1240 CERROR("Unable to set reuse on cmid: %d\n", rc);
1245 /* look for a free privileged port */
1246 for (port = PROT_SOCK-1; port > 0; port--) {
1247 srcaddr->sin_port = htons(port);
1248 rc = rdma_resolve_addr(cmid,
1249 (struct sockaddr *)srcaddr,
1250 (struct sockaddr *)dstaddr,
1253 CDEBUG(D_NET, "bound to port %hu\n", port);
1255 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1256 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1263 CERROR("Failed to bind to a free privileged port\n");
1264 #ifndef HAVE_OFED_RDMA_SET_REUSEADDR
1265 CERROR("You may need IB verbs that supports rdma_set_reuseaddr()\n");
1271 kiblnd_connect_peer (kib_peer_t *peer)
1273 struct rdma_cm_id *cmid;
1275 kib_net_t *net = peer->ibp_ni->ni_data;
1276 struct sockaddr_in srcaddr;
1277 struct sockaddr_in dstaddr;
1280 LASSERT (net != NULL);
1281 LASSERT (peer->ibp_connecting > 0);
1283 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1287 CERROR("Can't create CMID for %s: %ld\n",
1288 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1294 memset(&srcaddr, 0, sizeof(srcaddr));
1295 srcaddr.sin_family = AF_INET;
1296 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1298 memset(&dstaddr, 0, sizeof(dstaddr));
1299 dstaddr.sin_family = AF_INET;
1300 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1301 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1303 kiblnd_peer_addref(peer); /* cmid's ref */
1305 if (*kiblnd_tunables.kib_use_priv_port) {
1306 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1307 *kiblnd_tunables.kib_timeout * 1000);
1309 rc = rdma_resolve_addr(cmid,
1310 (struct sockaddr *)&srcaddr,
1311 (struct sockaddr *)&dstaddr,
1312 *kiblnd_tunables.kib_timeout * 1000);
1315 /* Can't initiate address resolution: */
1316 CERROR("Can't resolve addr for %s: %d\n",
1317 libcfs_nid2str(peer->ibp_nid), rc);
1321 LASSERT (cmid->device != NULL);
1322 CDEBUG(D_NET, "%s: connection bound to %s:%u.%u.%u.%u:%s\n",
1323 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1324 HIPQUAD(dev->ibd_ifip), cmid->device->name);
1329 kiblnd_peer_decref(peer); /* cmid's ref */
1330 rdma_destroy_id(cmid);
1332 kiblnd_peer_connect_failed(peer, 1, rc);
1336 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1341 cfs_rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1342 unsigned long flags;
1345 /* If I get here, I've committed to send, so I complete the tx with
1346 * failure on any problems */
1348 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1349 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1351 /* First time, just use a read lock since I expect to find my peer
1353 cfs_read_lock_irqsave(g_lock, flags);
1355 peer = kiblnd_find_peer_locked(nid);
1356 if (peer != NULL && !cfs_list_empty(&peer->ibp_conns)) {
1357 /* Found a peer with an established connection */
1358 conn = kiblnd_get_conn_locked(peer);
1359 kiblnd_conn_addref(conn); /* 1 ref for me... */
1361 cfs_read_unlock_irqrestore(g_lock, flags);
1364 kiblnd_queue_tx(tx, conn);
1365 kiblnd_conn_decref(conn); /* ...to here */
1369 cfs_read_unlock(g_lock);
1370 /* Re-try with a write lock */
1371 cfs_write_lock(g_lock);
1373 peer = kiblnd_find_peer_locked(nid);
1375 if (cfs_list_empty(&peer->ibp_conns)) {
1376 /* found a peer, but it's still connecting... */
1377 LASSERT (peer->ibp_connecting != 0 ||
1378 peer->ibp_accepting != 0);
1380 cfs_list_add_tail(&tx->tx_list,
1381 &peer->ibp_tx_queue);
1382 cfs_write_unlock_irqrestore(g_lock, flags);
1384 conn = kiblnd_get_conn_locked(peer);
1385 kiblnd_conn_addref(conn); /* 1 ref for me... */
1387 cfs_write_unlock_irqrestore(g_lock, flags);
1390 kiblnd_queue_tx(tx, conn);
1391 kiblnd_conn_decref(conn); /* ...to here */
1396 cfs_write_unlock_irqrestore(g_lock, flags);
1398 /* Allocate a peer ready to add to the peer table and retry */
1399 rc = kiblnd_create_peer(ni, &peer, nid);
1401 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1403 tx->tx_status = -EHOSTUNREACH;
1405 kiblnd_tx_done(ni, tx);
1410 cfs_write_lock_irqsave(g_lock, flags);
1412 peer2 = kiblnd_find_peer_locked(nid);
1413 if (peer2 != NULL) {
1414 if (cfs_list_empty(&peer2->ibp_conns)) {
1415 /* found a peer, but it's still connecting... */
1416 LASSERT (peer2->ibp_connecting != 0 ||
1417 peer2->ibp_accepting != 0);
1419 cfs_list_add_tail(&tx->tx_list,
1420 &peer2->ibp_tx_queue);
1421 cfs_write_unlock_irqrestore(g_lock, flags);
1423 conn = kiblnd_get_conn_locked(peer2);
1424 kiblnd_conn_addref(conn); /* 1 ref for me... */
1426 cfs_write_unlock_irqrestore(g_lock, flags);
1429 kiblnd_queue_tx(tx, conn);
1430 kiblnd_conn_decref(conn); /* ...to here */
1433 kiblnd_peer_decref(peer);
1437 /* Brand new peer */
1438 LASSERT (peer->ibp_connecting == 0);
1439 peer->ibp_connecting = 1;
1441 /* always called with a ref on ni, which prevents ni being shutdown */
1442 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1445 cfs_list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1447 kiblnd_peer_addref(peer);
1448 cfs_list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1450 cfs_write_unlock_irqrestore(g_lock, flags);
1452 kiblnd_connect_peer(peer);
1453 kiblnd_peer_decref(peer);
1457 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1459 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1460 int type = lntmsg->msg_type;
1461 lnet_process_id_t target = lntmsg->msg_target;
1462 int target_is_router = lntmsg->msg_target_is_router;
1463 int routing = lntmsg->msg_routing;
1464 unsigned int payload_niov = lntmsg->msg_niov;
1465 struct iovec *payload_iov = lntmsg->msg_iov;
1466 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1467 unsigned int payload_offset = lntmsg->msg_offset;
1468 unsigned int payload_nob = lntmsg->msg_len;
1474 /* NB 'private' is different depending on what we're sending.... */
1476 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1477 payload_nob, payload_niov, libcfs_id2str(target));
1479 LASSERT (payload_nob == 0 || payload_niov > 0);
1480 LASSERT (payload_niov <= LNET_MAX_IOV);
1482 /* Thread context */
1483 LASSERT (!cfs_in_interrupt());
1484 /* payload is either all vaddrs or all pages */
1485 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1493 LASSERT (payload_nob == 0);
1497 if (routing || target_is_router)
1498 break; /* send IMMEDIATE */
1500 /* is the REPLY message too small for RDMA? */
1501 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1502 if (nob <= IBLND_MSG_SIZE)
1503 break; /* send IMMEDIATE */
1505 tx = kiblnd_get_idle_tx(ni, target.nid);
1507 CERROR("Can't allocate txd for GET to %s\n",
1508 libcfs_nid2str(target.nid));
1514 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1515 rc = kiblnd_setup_rd_iov(ni, tx,
1516 &ibmsg->ibm_u.get.ibgm_rd,
1517 lntmsg->msg_md->md_niov,
1518 lntmsg->msg_md->md_iov.iov,
1519 0, lntmsg->msg_md->md_length);
1521 rc = kiblnd_setup_rd_kiov(ni, tx,
1522 &ibmsg->ibm_u.get.ibgm_rd,
1523 lntmsg->msg_md->md_niov,
1524 lntmsg->msg_md->md_iov.kiov,
1525 0, lntmsg->msg_md->md_length);
1527 CERROR("Can't setup GET sink for %s: %d\n",
1528 libcfs_nid2str(target.nid), rc);
1529 kiblnd_tx_done(ni, tx);
1533 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1534 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1535 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1537 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1539 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1540 if (tx->tx_lntmsg[1] == NULL) {
1541 CERROR("Can't create reply for GET -> %s\n",
1542 libcfs_nid2str(target.nid));
1543 kiblnd_tx_done(ni, tx);
1547 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1548 tx->tx_waiting = 1; /* waiting for GET_DONE */
1549 kiblnd_launch_tx(ni, tx, target.nid);
1552 case LNET_MSG_REPLY:
1554 /* Is the payload small enough not to need RDMA? */
1555 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1556 if (nob <= IBLND_MSG_SIZE)
1557 break; /* send IMMEDIATE */
1559 tx = kiblnd_get_idle_tx(ni, target.nid);
1561 CERROR("Can't allocate %s txd for %s\n",
1562 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1563 libcfs_nid2str(target.nid));
1567 if (payload_kiov == NULL)
1568 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1569 payload_niov, payload_iov,
1570 payload_offset, payload_nob);
1572 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1573 payload_niov, payload_kiov,
1574 payload_offset, payload_nob);
1576 CERROR("Can't setup PUT src for %s: %d\n",
1577 libcfs_nid2str(target.nid), rc);
1578 kiblnd_tx_done(ni, tx);
1583 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1584 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1585 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1587 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1588 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1589 kiblnd_launch_tx(ni, tx, target.nid);
1593 /* send IMMEDIATE */
1595 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1598 tx = kiblnd_get_idle_tx(ni, target.nid);
1600 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1601 type, libcfs_nid2str(target.nid));
1606 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1608 if (payload_kiov != NULL)
1609 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1610 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1611 payload_niov, payload_kiov,
1612 payload_offset, payload_nob);
1614 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1615 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1616 payload_niov, payload_iov,
1617 payload_offset, payload_nob);
1619 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1620 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1622 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1623 kiblnd_launch_tx(ni, tx, target.nid);
1628 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1630 lnet_process_id_t target = lntmsg->msg_target;
1631 unsigned int niov = lntmsg->msg_niov;
1632 struct iovec *iov = lntmsg->msg_iov;
1633 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1634 unsigned int offset = lntmsg->msg_offset;
1635 unsigned int nob = lntmsg->msg_len;
1639 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1641 CERROR("Can't get tx for REPLY to %s\n",
1642 libcfs_nid2str(target.nid));
1648 else if (kiov == NULL)
1649 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1650 niov, iov, offset, nob);
1652 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1653 niov, kiov, offset, nob);
1656 CERROR("Can't setup GET src for %s: %d\n",
1657 libcfs_nid2str(target.nid), rc);
1661 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1662 IBLND_MSG_GET_DONE, nob,
1663 &rx->rx_msg->ibm_u.get.ibgm_rd,
1664 rx->rx_msg->ibm_u.get.ibgm_cookie);
1666 CERROR("Can't setup rdma for GET from %s: %d\n",
1667 libcfs_nid2str(target.nid), rc);
1672 /* No RDMA: local completion may happen now! */
1673 lnet_finalize(ni, lntmsg, 0);
1675 /* RDMA: lnet_finalize(lntmsg) when it
1677 tx->tx_lntmsg[0] = lntmsg;
1680 kiblnd_queue_tx(tx, rx->rx_conn);
1684 kiblnd_tx_done(ni, tx);
1686 lnet_finalize(ni, lntmsg, -EIO);
1690 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1691 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1692 unsigned int offset, unsigned int mlen, unsigned int rlen)
1694 kib_rx_t *rx = private;
1695 kib_msg_t *rxmsg = rx->rx_msg;
1696 kib_conn_t *conn = rx->rx_conn;
1700 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1703 LASSERT (mlen <= rlen);
1704 LASSERT (!cfs_in_interrupt());
1705 /* Either all pages or all vaddrs */
1706 LASSERT (!(kiov != NULL && iov != NULL));
1708 switch (rxmsg->ibm_type) {
1712 case IBLND_MSG_IMMEDIATE:
1713 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1714 if (nob > rx->rx_nob) {
1715 CERROR ("Immediate message from %s too big: %d(%d)\n",
1716 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1723 lnet_copy_flat2kiov(niov, kiov, offset,
1724 IBLND_MSG_SIZE, rxmsg,
1725 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1728 lnet_copy_flat2iov(niov, iov, offset,
1729 IBLND_MSG_SIZE, rxmsg,
1730 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1732 lnet_finalize (ni, lntmsg, 0);
1735 case IBLND_MSG_PUT_REQ:
1737 lnet_finalize(ni, lntmsg, 0);
1738 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1739 rxmsg->ibm_u.putreq.ibprm_cookie);
1743 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1745 CERROR("Can't allocate tx for %s\n",
1746 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1747 /* Not replying will break the connection */
1754 rc = kiblnd_setup_rd_iov(ni, tx,
1755 &txmsg->ibm_u.putack.ibpam_rd,
1756 niov, iov, offset, mlen);
1758 rc = kiblnd_setup_rd_kiov(ni, tx,
1759 &txmsg->ibm_u.putack.ibpam_rd,
1760 niov, kiov, offset, mlen);
1762 CERROR("Can't setup PUT sink for %s: %d\n",
1763 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1764 kiblnd_tx_done(ni, tx);
1765 /* tell peer it's over */
1766 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1767 rxmsg->ibm_u.putreq.ibprm_cookie);
1771 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1772 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1773 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1775 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1777 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1778 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1779 kiblnd_queue_tx(tx, conn);
1781 /* reposted buffer reserved for PUT_DONE */
1782 post_credit = IBLND_POSTRX_NO_CREDIT;
1785 case IBLND_MSG_GET_REQ:
1786 if (lntmsg != NULL) {
1787 /* Optimized GET; RDMA lntmsg's payload */
1788 kiblnd_reply(ni, rx, lntmsg);
1790 /* GET didn't match anything */
1791 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1793 rxmsg->ibm_u.get.ibgm_cookie);
1798 kiblnd_post_rx(rx, post_credit);
1803 kiblnd_thread_start (int (*fn)(void *arg), void *arg)
1805 long pid = cfs_create_thread (fn, arg, 0);
1810 cfs_atomic_inc (&kiblnd_data.kib_nthreads);
1815 kiblnd_thread_fini (void)
1817 cfs_atomic_dec (&kiblnd_data.kib_nthreads);
1821 kiblnd_peer_alive (kib_peer_t *peer)
1823 /* This is racy, but everyone's only writing cfs_time_current() */
1824 peer->ibp_last_alive = cfs_time_current();
1829 kiblnd_peer_notify (kib_peer_t *peer)
1832 cfs_time_t last_alive = 0;
1833 unsigned long flags;
1835 cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1837 if (cfs_list_empty(&peer->ibp_conns) &&
1838 peer->ibp_accepting == 0 &&
1839 peer->ibp_connecting == 0 &&
1840 peer->ibp_error != 0) {
1841 error = peer->ibp_error;
1842 peer->ibp_error = 0;
1844 last_alive = peer->ibp_last_alive;
1847 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1850 lnet_notify(peer->ibp_ni,
1851 peer->ibp_nid, 0, last_alive);
1855 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1857 /* This just does the immediate housekeeping. 'error' is zero for a
1858 * normal shutdown which can happen only after the connection has been
1859 * established. If the connection is established, schedule the
1860 * connection to be finished off by the connd. Otherwise the connd is
1861 * already dealing with it (either to set it up or tear it down).
1862 * Caller holds kib_global_lock exclusively in irq context */
1863 kib_peer_t *peer = conn->ibc_peer;
1865 unsigned long flags;
1867 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1869 if (error != 0 && conn->ibc_comms_error == 0)
1870 conn->ibc_comms_error = error;
1872 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1873 return; /* already being handled */
1876 cfs_list_empty(&conn->ibc_tx_noops) &&
1877 cfs_list_empty(&conn->ibc_tx_queue) &&
1878 cfs_list_empty(&conn->ibc_tx_queue_rsrvd) &&
1879 cfs_list_empty(&conn->ibc_tx_queue_nocred) &&
1880 cfs_list_empty(&conn->ibc_active_txs)) {
1881 CDEBUG(D_NET, "closing conn to %s\n",
1882 libcfs_nid2str(peer->ibp_nid));
1884 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1885 libcfs_nid2str(peer->ibp_nid), error,
1886 cfs_list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1887 cfs_list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1888 cfs_list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1889 cfs_list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1890 cfs_list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1893 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1894 cfs_list_del(&conn->ibc_list);
1895 /* connd (see below) takes over ibc_list's ref */
1897 if (cfs_list_empty (&peer->ibp_conns) && /* no more conns */
1898 kiblnd_peer_active(peer)) { /* still in peer table */
1899 kiblnd_unlink_peer_locked(peer);
1901 /* set/clear error on last conn */
1902 peer->ibp_error = conn->ibc_comms_error;
1905 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1908 kiblnd_dev_can_failover(dev)) {
1909 cfs_list_add_tail(&dev->ibd_fail_list,
1910 &kiblnd_data.kib_failed_devs);
1911 cfs_waitq_signal(&kiblnd_data.kib_failover_waitq);
1914 cfs_spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1916 cfs_list_add_tail (&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1917 cfs_waitq_signal (&kiblnd_data.kib_connd_waitq);
1919 cfs_spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1923 kiblnd_close_conn (kib_conn_t *conn, int error)
1925 unsigned long flags;
1927 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1929 kiblnd_close_conn_locked(conn, error);
1931 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1935 kiblnd_handle_early_rxs(kib_conn_t *conn)
1937 unsigned long flags;
1940 LASSERT (!cfs_in_interrupt());
1941 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1943 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1944 while (!cfs_list_empty(&conn->ibc_early_rxs)) {
1945 rx = cfs_list_entry(conn->ibc_early_rxs.next,
1947 cfs_list_del(&rx->rx_list);
1948 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
1951 kiblnd_handle_rx(rx);
1953 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1955 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1959 kiblnd_abort_txs(kib_conn_t *conn, cfs_list_t *txs)
1961 CFS_LIST_HEAD (zombies);
1966 cfs_spin_lock(&conn->ibc_lock);
1968 cfs_list_for_each_safe (tmp, nxt, txs) {
1969 tx = cfs_list_entry (tmp, kib_tx_t, tx_list);
1971 if (txs == &conn->ibc_active_txs) {
1972 LASSERT (!tx->tx_queued);
1973 LASSERT (tx->tx_waiting ||
1974 tx->tx_sending != 0);
1976 LASSERT (tx->tx_queued);
1979 tx->tx_status = -ECONNABORTED;
1982 if (tx->tx_sending == 0) {
1984 cfs_list_del (&tx->tx_list);
1985 cfs_list_add (&tx->tx_list, &zombies);
1989 cfs_spin_unlock(&conn->ibc_lock);
1991 kiblnd_txlist_done(conn->ibc_peer->ibp_ni,
1992 &zombies, -ECONNABORTED);
1996 kiblnd_finalise_conn (kib_conn_t *conn)
1998 LASSERT (!cfs_in_interrupt());
1999 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2001 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2003 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2004 * for connections that didn't get as far as being connected, because
2005 * rdma_disconnect() does this for free. */
2006 kiblnd_abort_receives(conn);
2008 /* Complete all tx descs not waiting for sends to complete.
2009 * NB we should be safe from RDMA now that the QP has changed state */
2011 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2012 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2013 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2014 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2015 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2017 kiblnd_handle_early_rxs(conn);
2021 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
2023 CFS_LIST_HEAD (zombies);
2024 unsigned long flags;
2026 LASSERT (error != 0);
2027 LASSERT (!cfs_in_interrupt());
2029 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2032 LASSERT (peer->ibp_connecting > 0);
2033 peer->ibp_connecting--;
2035 LASSERT (peer->ibp_accepting > 0);
2036 peer->ibp_accepting--;
2039 if (peer->ibp_connecting != 0 ||
2040 peer->ibp_accepting != 0) {
2041 /* another connection attempt under way... */
2042 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2047 if (cfs_list_empty(&peer->ibp_conns)) {
2048 /* Take peer's blocked transmits to complete with error */
2049 cfs_list_add(&zombies, &peer->ibp_tx_queue);
2050 cfs_list_del_init(&peer->ibp_tx_queue);
2052 if (kiblnd_peer_active(peer))
2053 kiblnd_unlink_peer_locked(peer);
2055 peer->ibp_error = error;
2057 /* Can't have blocked transmits if there are connections */
2058 LASSERT (cfs_list_empty(&peer->ibp_tx_queue));
2061 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2063 kiblnd_peer_notify(peer);
2065 if (cfs_list_empty (&zombies))
2068 CNETERR("Deleting messages for %s: connection failed\n",
2069 libcfs_nid2str(peer->ibp_nid));
2071 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2075 kiblnd_connreq_done(kib_conn_t *conn, int status)
2077 kib_peer_t *peer = conn->ibc_peer;
2080 unsigned long flags;
2083 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2085 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2086 libcfs_nid2str(peer->ibp_nid), active,
2087 conn->ibc_version, status);
2089 LASSERT (!cfs_in_interrupt());
2090 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2091 peer->ibp_connecting > 0) ||
2092 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2093 peer->ibp_accepting > 0));
2095 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2096 conn->ibc_connvars = NULL;
2099 /* failed to establish connection */
2100 kiblnd_peer_connect_failed(peer, active, status);
2101 kiblnd_finalise_conn(conn);
2105 /* connection established */
2106 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2108 conn->ibc_last_send = jiffies;
2109 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2110 kiblnd_peer_alive(peer);
2112 /* Add conn to peer's list and nuke any dangling conns from a different
2113 * peer instance... */
2114 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2115 cfs_list_add(&conn->ibc_list, &peer->ibp_conns);
2117 peer->ibp_connecting--;
2119 peer->ibp_accepting--;
2121 if (peer->ibp_version == 0) {
2122 peer->ibp_version = conn->ibc_version;
2123 peer->ibp_incarnation = conn->ibc_incarnation;
2126 if (peer->ibp_version != conn->ibc_version ||
2127 peer->ibp_incarnation != conn->ibc_incarnation) {
2128 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2129 conn->ibc_incarnation);
2130 peer->ibp_version = conn->ibc_version;
2131 peer->ibp_incarnation = conn->ibc_incarnation;
2134 /* grab pending txs while I have the lock */
2135 cfs_list_add(&txs, &peer->ibp_tx_queue);
2136 cfs_list_del_init(&peer->ibp_tx_queue);
2138 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2139 conn->ibc_comms_error != 0) { /* error has happened already */
2140 lnet_ni_t *ni = peer->ibp_ni;
2142 /* start to shut down connection */
2143 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2144 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2147 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2152 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2154 /* Schedule blocked txs */
2155 cfs_spin_lock (&conn->ibc_lock);
2156 while (!cfs_list_empty (&txs)) {
2157 tx = cfs_list_entry (txs.next, kib_tx_t, tx_list);
2158 cfs_list_del(&tx->tx_list);
2160 kiblnd_queue_tx_locked(tx, conn);
2162 cfs_spin_unlock (&conn->ibc_lock);
2164 kiblnd_check_sends(conn);
2166 /* schedule blocked rxs */
2167 kiblnd_handle_early_rxs(conn);
2171 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2175 rc = rdma_reject(cmid, rej, sizeof(*rej));
2178 CWARN("Error %d sending reject\n", rc);
2182 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2184 cfs_rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2185 kib_msg_t *reqmsg = priv;
2191 lnet_ni_t *ni = NULL;
2192 kib_net_t *net = NULL;
2194 struct rdma_conn_param cp;
2196 int version = IBLND_MSG_VERSION;
2197 unsigned long flags;
2199 struct sockaddr_in *peer_addr;
2200 LASSERT (!cfs_in_interrupt());
2202 /* cmid inherits 'context' from the corresponding listener id */
2203 ibdev = (kib_dev_t *)cmid->context;
2204 LASSERT (ibdev != NULL);
2206 memset(&rej, 0, sizeof(rej));
2207 rej.ibr_magic = IBLND_MSG_MAGIC;
2208 rej.ibr_why = IBLND_REJECT_FATAL;
2209 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2211 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2212 if (*kiblnd_tunables.kib_require_priv_port &&
2213 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2214 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2215 CERROR("Peer's port (%u.%u.%u.%u:%hu) is not privileged\n",
2216 HIPQUAD(ip), ntohs(peer_addr->sin_port));
2220 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2221 CERROR("Short connection request\n");
2225 /* Future protocol version compatibility support! If the
2226 * o2iblnd-specific protocol changes, or when LNET unifies
2227 * protocols over all LNDs, the initial connection will
2228 * negotiate a protocol version. I trap this here to avoid
2229 * console errors; the reject tells the peer which protocol I
2231 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2232 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2234 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2235 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2236 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2238 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2239 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2240 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2243 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2245 CERROR("Can't parse connection request: %d\n", rc);
2249 nid = reqmsg->ibm_srcnid;
2250 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2253 net = (kib_net_t *)ni->ni_data;
2254 rej.ibr_incarnation = net->ibn_incarnation;
2257 if (ni == NULL || /* no matching net */
2258 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2259 net->ibn_dev != ibdev) { /* wrong device */
2260 CERROR("Can't accept %s on %s (%s:%d:%u.%u.%u.%u): "
2261 "bad dst nid %s\n", libcfs_nid2str(nid),
2262 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2263 ibdev->ibd_ifname, ibdev->ibd_nnets,
2264 HIPQUAD(ibdev->ibd_ifip),
2265 libcfs_nid2str(reqmsg->ibm_dstnid));
2270 /* check time stamp as soon as possible */
2271 if (reqmsg->ibm_dststamp != 0 &&
2272 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2273 CWARN("Stale connection request\n");
2274 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2278 /* I can accept peer's version */
2279 version = reqmsg->ibm_version;
2281 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2282 CERROR("Unexpected connreq msg type: %x from %s\n",
2283 reqmsg->ibm_type, libcfs_nid2str(nid));
2287 if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2288 IBLND_MSG_QUEUE_SIZE(version)) {
2289 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2290 libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2291 IBLND_MSG_QUEUE_SIZE(version));
2293 if (version == IBLND_MSG_VERSION)
2294 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2299 if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2300 IBLND_RDMA_FRAGS(version)) {
2301 CERROR("Can't accept %s(version %x): "
2302 "incompatible max_frags %d (%d wanted)\n",
2303 libcfs_nid2str(nid), version,
2304 reqmsg->ibm_u.connparams.ibcp_max_frags,
2305 IBLND_RDMA_FRAGS(version));
2307 if (version == IBLND_MSG_VERSION)
2308 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2314 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2315 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2316 libcfs_nid2str(nid),
2317 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2322 /* assume 'nid' is a new peer; create */
2323 rc = kiblnd_create_peer(ni, &peer, nid);
2325 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2326 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2330 cfs_write_lock_irqsave(g_lock, flags);
2332 peer2 = kiblnd_find_peer_locked(nid);
2333 if (peer2 != NULL) {
2334 if (peer2->ibp_version == 0) {
2335 peer2->ibp_version = version;
2336 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2339 /* not the guy I've talked with */
2340 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2341 peer2->ibp_version != version) {
2342 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2343 cfs_write_unlock_irqrestore(g_lock, flags);
2345 CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2346 libcfs_nid2str(nid), peer2->ibp_version, version);
2348 kiblnd_peer_decref(peer);
2349 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2353 /* tie-break connection race in favour of the higher NID */
2354 if (peer2->ibp_connecting != 0 &&
2356 cfs_write_unlock_irqrestore(g_lock, flags);
2358 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2360 kiblnd_peer_decref(peer);
2361 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2365 peer2->ibp_accepting++;
2366 kiblnd_peer_addref(peer2);
2368 cfs_write_unlock_irqrestore(g_lock, flags);
2369 kiblnd_peer_decref(peer);
2372 /* Brand new peer */
2373 LASSERT (peer->ibp_accepting == 0);
2374 LASSERT (peer->ibp_version == 0 &&
2375 peer->ibp_incarnation == 0);
2377 peer->ibp_accepting = 1;
2378 peer->ibp_version = version;
2379 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2381 /* I have a ref on ni that prevents it being shutdown */
2382 LASSERT (net->ibn_shutdown == 0);
2384 kiblnd_peer_addref(peer);
2385 cfs_list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2387 cfs_write_unlock_irqrestore(g_lock, flags);
2390 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2392 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2393 kiblnd_peer_decref(peer);
2394 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2398 /* conn now "owns" cmid, so I return success from here on to ensure the
2399 * CM callback doesn't destroy cmid. */
2401 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2402 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE(version);
2403 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2404 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2405 <= IBLND_RX_MSGS(version));
2407 ackmsg = &conn->ibc_connvars->cv_msg;
2408 memset(ackmsg, 0, sizeof(*ackmsg));
2410 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2411 sizeof(ackmsg->ibm_u.connparams));
2412 ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2413 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2414 ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2416 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2418 memset(&cp, 0, sizeof(cp));
2419 cp.private_data = ackmsg;
2420 cp.private_data_len = ackmsg->ibm_nob;
2421 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2422 cp.initiator_depth = 0;
2423 cp.flow_control = 1;
2424 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2425 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2427 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2429 rc = rdma_accept(cmid, &cp);
2431 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2432 rej.ibr_version = version;
2433 rej.ibr_why = IBLND_REJECT_FATAL;
2435 kiblnd_reject(cmid, &rej);
2436 kiblnd_connreq_done(conn, rc);
2437 kiblnd_conn_decref(conn);
2447 rej.ibr_version = version;
2448 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2449 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2450 kiblnd_reject(cmid, &rej);
2452 return -ECONNREFUSED;
2456 kiblnd_reconnect (kib_conn_t *conn, int version,
2457 __u64 incarnation, int why, kib_connparams_t *cp)
2459 kib_peer_t *peer = conn->ibc_peer;
2462 unsigned long flags;
2464 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2465 LASSERT (peer->ibp_connecting > 0); /* 'conn' at least */
2467 cfs_write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2469 /* retry connection if it's still needed and no other connection
2470 * attempts (active or passive) are in progress
2471 * NB: reconnect is still needed even when ibp_tx_queue is
2472 * empty if ibp_version != version because reconnect may be
2473 * initiated by kiblnd_query() */
2474 if ((!cfs_list_empty(&peer->ibp_tx_queue) ||
2475 peer->ibp_version != version) &&
2476 peer->ibp_connecting == 1 &&
2477 peer->ibp_accepting == 0) {
2479 peer->ibp_connecting++;
2481 peer->ibp_version = version;
2482 peer->ibp_incarnation = incarnation;
2485 cfs_write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2495 case IBLND_REJECT_CONN_STALE:
2499 case IBLND_REJECT_CONN_RACE:
2500 reason = "conn race";
2503 case IBLND_REJECT_CONN_UNCOMPAT:
2504 reason = "version negotiation";
2508 CNETERR("%s: retrying (%s), %x, %x, "
2509 "queue_dep: %d, max_frag: %d, msg_size: %d\n",
2510 libcfs_nid2str(peer->ibp_nid),
2511 reason, IBLND_MSG_VERSION, version,
2512 cp != NULL? cp->ibcp_queue_depth :IBLND_MSG_QUEUE_SIZE(version),
2513 cp != NULL? cp->ibcp_max_frags : IBLND_RDMA_FRAGS(version),
2514 cp != NULL? cp->ibcp_max_msg_size: IBLND_MSG_SIZE);
2516 kiblnd_connect_peer(peer);
2520 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2522 kib_peer_t *peer = conn->ibc_peer;
2524 LASSERT (!cfs_in_interrupt());
2525 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2528 case IB_CM_REJ_STALE_CONN:
2529 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2530 IBLND_REJECT_CONN_STALE, NULL);
2533 case IB_CM_REJ_INVALID_SERVICE_ID:
2534 CNETERR("%s rejected: no listener at %d\n",
2535 libcfs_nid2str(peer->ibp_nid),
2536 *kiblnd_tunables.kib_service);
2539 case IB_CM_REJ_CONSUMER_DEFINED:
2540 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2541 kib_rej_t *rej = priv;
2542 kib_connparams_t *cp = NULL;
2544 __u64 incarnation = -1;
2546 /* NB. default incarnation is -1 because:
2547 * a) V1 will ignore dst incarnation in connreq.
2548 * b) V2 will provide incarnation while rejecting me,
2549 * -1 will be overwrote.
2551 * if I try to connect to a V1 peer with V2 protocol,
2552 * it rejected me then upgrade to V2, I have no idea
2553 * about the upgrading and try to reconnect with V1,
2554 * in this case upgraded V2 can find out I'm trying to
2555 * talk to the old guy and reject me(incarnation is -1).
2558 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2559 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2560 __swab32s(&rej->ibr_magic);
2561 __swab16s(&rej->ibr_version);
2565 if (priv_nob >= sizeof(kib_rej_t) &&
2566 rej->ibr_version > IBLND_MSG_VERSION_1) {
2567 /* priv_nob is always 148 in current version
2568 * of OFED, so we still need to check version.
2569 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2573 __swab64s(&rej->ibr_incarnation);
2574 __swab16s(&cp->ibcp_queue_depth);
2575 __swab16s(&cp->ibcp_max_frags);
2576 __swab32s(&cp->ibcp_max_msg_size);
2579 incarnation = rej->ibr_incarnation;
2582 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2583 rej->ibr_magic != LNET_PROTO_MAGIC) {
2584 CERROR("%s rejected: consumer defined fatal error\n",
2585 libcfs_nid2str(peer->ibp_nid));
2589 if (rej->ibr_version != IBLND_MSG_VERSION &&
2590 rej->ibr_version != IBLND_MSG_VERSION_1) {
2591 CERROR("%s rejected: o2iblnd version %x error\n",
2592 libcfs_nid2str(peer->ibp_nid),
2597 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2598 rej->ibr_version == IBLND_MSG_VERSION_1) {
2599 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2600 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2602 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2603 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2606 switch (rej->ibr_why) {
2607 case IBLND_REJECT_CONN_RACE:
2608 case IBLND_REJECT_CONN_STALE:
2609 case IBLND_REJECT_CONN_UNCOMPAT:
2610 kiblnd_reconnect(conn, rej->ibr_version,
2611 incarnation, rej->ibr_why, cp);
2614 case IBLND_REJECT_MSG_QUEUE_SIZE:
2615 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2616 libcfs_nid2str(peer->ibp_nid), cp->ibcp_queue_depth,
2617 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2620 case IBLND_REJECT_RDMA_FRAGS:
2621 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2622 libcfs_nid2str(peer->ibp_nid), cp->ibcp_max_frags,
2623 IBLND_RDMA_FRAGS(conn->ibc_version));
2626 case IBLND_REJECT_NO_RESOURCES:
2627 CERROR("%s rejected: o2iblnd no resources\n",
2628 libcfs_nid2str(peer->ibp_nid));
2631 case IBLND_REJECT_FATAL:
2632 CERROR("%s rejected: o2iblnd fatal error\n",
2633 libcfs_nid2str(peer->ibp_nid));
2637 CERROR("%s rejected: o2iblnd reason %d\n",
2638 libcfs_nid2str(peer->ibp_nid),
2646 CNETERR("%s rejected: reason %d, size %d\n",
2647 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2651 kiblnd_connreq_done(conn, -ECONNREFUSED);
2655 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2657 kib_peer_t *peer = conn->ibc_peer;
2658 lnet_ni_t *ni = peer->ibp_ni;
2659 kib_net_t *net = ni->ni_data;
2660 kib_msg_t *msg = priv;
2661 int ver = conn->ibc_version;
2662 int rc = kiblnd_unpack_msg(msg, priv_nob);
2663 unsigned long flags;
2665 LASSERT (net != NULL);
2668 CERROR("Can't unpack connack from %s: %d\n",
2669 libcfs_nid2str(peer->ibp_nid), rc);
2673 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2674 CERROR("Unexpected message %d from %s\n",
2675 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2680 if (ver != msg->ibm_version) {
2681 CERROR("%s replied version %x is different with "
2682 "requested version %x\n",
2683 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2688 if (msg->ibm_u.connparams.ibcp_queue_depth !=
2689 IBLND_MSG_QUEUE_SIZE(ver)) {
2690 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2691 libcfs_nid2str(peer->ibp_nid),
2692 msg->ibm_u.connparams.ibcp_queue_depth,
2693 IBLND_MSG_QUEUE_SIZE(ver));
2698 if (msg->ibm_u.connparams.ibcp_max_frags !=
2699 IBLND_RDMA_FRAGS(ver)) {
2700 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2701 libcfs_nid2str(peer->ibp_nid),
2702 msg->ibm_u.connparams.ibcp_max_frags,
2703 IBLND_RDMA_FRAGS(ver));
2708 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2709 CERROR("%s max message size %d too big (%d max)\n",
2710 libcfs_nid2str(peer->ibp_nid),
2711 msg->ibm_u.connparams.ibcp_max_msg_size,
2717 cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2718 if (msg->ibm_dstnid == ni->ni_nid &&
2719 msg->ibm_dststamp == net->ibn_incarnation)
2723 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2726 CERROR("Bad connection reply from %s, rc = %d, "
2727 "version: %x max_frags: %d\n",
2728 libcfs_nid2str(peer->ibp_nid), rc,
2729 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2733 conn->ibc_incarnation = msg->ibm_srcstamp;
2735 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2736 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2737 <= IBLND_RX_MSGS(ver));
2739 kiblnd_connreq_done(conn, 0);
2743 /* NB My QP has already established itself, so I handle anything going
2744 * wrong here by setting ibc_comms_error.
2745 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2746 * immediately tears it down. */
2749 conn->ibc_comms_error = rc;
2750 kiblnd_connreq_done(conn, 0);
2754 kiblnd_active_connect (struct rdma_cm_id *cmid)
2756 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2759 struct rdma_conn_param cp;
2762 unsigned long flags;
2765 cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2767 incarnation = peer->ibp_incarnation;
2768 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION : peer->ibp_version;
2770 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2772 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2774 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2775 kiblnd_peer_decref(peer); /* lose cmid's ref */
2779 /* conn "owns" cmid now, so I return success from here on to ensure the
2780 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2783 msg = &conn->ibc_connvars->cv_msg;
2785 memset(msg, 0, sizeof(*msg));
2786 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2787 msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2788 msg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2789 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2791 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2792 0, peer->ibp_nid, incarnation);
2794 memset(&cp, 0, sizeof(cp));
2795 cp.private_data = msg;
2796 cp.private_data_len = msg->ibm_nob;
2797 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2798 cp.initiator_depth = 0;
2799 cp.flow_control = 1;
2800 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2801 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2803 LASSERT(cmid->context == (void *)conn);
2804 LASSERT(conn->ibc_cmid == cmid);
2806 rc = rdma_connect(cmid, &cp);
2808 CERROR("Can't connect to %s: %d\n",
2809 libcfs_nid2str(peer->ibp_nid), rc);
2810 kiblnd_connreq_done(conn, rc);
2811 kiblnd_conn_decref(conn);
2818 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2824 switch (event->event) {
2826 CERROR("Unexpected event: %d, status: %d\n",
2827 event->event, event->status);
2830 case RDMA_CM_EVENT_CONNECT_REQUEST:
2831 /* destroy cmid on failure */
2832 rc = kiblnd_passive_connect(cmid,
2833 (void *)KIBLND_CONN_PARAM(event),
2834 KIBLND_CONN_PARAM_LEN(event));
2835 CDEBUG(D_NET, "connreq: %d\n", rc);
2838 case RDMA_CM_EVENT_ADDR_ERROR:
2839 peer = (kib_peer_t *)cmid->context;
2840 CNETERR("%s: ADDR ERROR %d\n",
2841 libcfs_nid2str(peer->ibp_nid), event->status);
2842 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2843 kiblnd_peer_decref(peer);
2844 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2846 case RDMA_CM_EVENT_ADDR_RESOLVED:
2847 peer = (kib_peer_t *)cmid->context;
2849 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2850 libcfs_nid2str(peer->ibp_nid), event->status);
2852 if (event->status != 0) {
2853 CNETERR("Can't resolve address for %s: %d\n",
2854 libcfs_nid2str(peer->ibp_nid), event->status);
2857 rc = rdma_resolve_route(
2858 cmid, *kiblnd_tunables.kib_timeout * 1000);
2861 /* Can't initiate route resolution */
2862 CERROR("Can't resolve route for %s: %d\n",
2863 libcfs_nid2str(peer->ibp_nid), rc);
2865 kiblnd_peer_connect_failed(peer, 1, rc);
2866 kiblnd_peer_decref(peer);
2867 return rc; /* rc != 0 destroys cmid */
2869 case RDMA_CM_EVENT_ROUTE_ERROR:
2870 peer = (kib_peer_t *)cmid->context;
2871 CNETERR("%s: ROUTE ERROR %d\n",
2872 libcfs_nid2str(peer->ibp_nid), event->status);
2873 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2874 kiblnd_peer_decref(peer);
2875 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2877 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2878 peer = (kib_peer_t *)cmid->context;
2879 CDEBUG(D_NET,"%s Route resolved: %d\n",
2880 libcfs_nid2str(peer->ibp_nid), event->status);
2882 if (event->status == 0)
2883 return kiblnd_active_connect(cmid);
2885 CNETERR("Can't resolve route for %s: %d\n",
2886 libcfs_nid2str(peer->ibp_nid), event->status);
2887 kiblnd_peer_connect_failed(peer, 1, event->status);
2888 kiblnd_peer_decref(peer);
2889 return event->status; /* rc != 0 destroys cmid */
2891 case RDMA_CM_EVENT_UNREACHABLE:
2892 conn = (kib_conn_t *)cmid->context;
2893 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2894 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2895 CNETERR("%s: UNREACHABLE %d\n",
2896 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2897 kiblnd_connreq_done(conn, -ENETDOWN);
2898 kiblnd_conn_decref(conn);
2901 case RDMA_CM_EVENT_CONNECT_ERROR:
2902 conn = (kib_conn_t *)cmid->context;
2903 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2904 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2905 CNETERR("%s: CONNECT ERROR %d\n",
2906 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2907 kiblnd_connreq_done(conn, -ENOTCONN);
2908 kiblnd_conn_decref(conn);
2911 case RDMA_CM_EVENT_REJECTED:
2912 conn = (kib_conn_t *)cmid->context;
2913 switch (conn->ibc_state) {
2917 case IBLND_CONN_PASSIVE_WAIT:
2918 CERROR ("%s: REJECTED %d\n",
2919 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2921 kiblnd_connreq_done(conn, -ECONNRESET);
2924 case IBLND_CONN_ACTIVE_CONNECT:
2925 kiblnd_rejected(conn, event->status,
2926 (void *)KIBLND_CONN_PARAM(event),
2927 KIBLND_CONN_PARAM_LEN(event));
2930 kiblnd_conn_decref(conn);
2933 case RDMA_CM_EVENT_ESTABLISHED:
2934 conn = (kib_conn_t *)cmid->context;
2935 switch (conn->ibc_state) {
2939 case IBLND_CONN_PASSIVE_WAIT:
2940 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2941 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2942 kiblnd_connreq_done(conn, 0);
2945 case IBLND_CONN_ACTIVE_CONNECT:
2946 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2947 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2948 kiblnd_check_connreply(conn,
2949 (void *)KIBLND_CONN_PARAM(event),
2950 KIBLND_CONN_PARAM_LEN(event));
2953 /* net keeps its ref on conn! */
2956 #ifdef HAVE_OFED_RDMA_CMEV_TIMEWAIT_EXIT
2957 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2958 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
2961 case RDMA_CM_EVENT_DISCONNECTED:
2962 conn = (kib_conn_t *)cmid->context;
2963 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2964 CERROR("%s DISCONNECTED\n",
2965 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2966 kiblnd_connreq_done(conn, -ECONNRESET);
2968 kiblnd_close_conn(conn, 0);
2970 kiblnd_conn_decref(conn);
2971 cmid->context = NULL;
2974 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2975 LCONSOLE_ERROR_MSG(0x131,
2976 "Received notification of device removal\n"
2977 "Please shutdown LNET to allow this to proceed\n");
2978 /* Can't remove network from underneath LNET for now, so I have
2982 #ifdef HAVE_OFED_RDMA_CMEV_ADDRCHANGE
2983 case RDMA_CM_EVENT_ADDR_CHANGE:
2984 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
2991 kiblnd_check_txs_locked(kib_conn_t *conn, cfs_list_t *txs)
2996 cfs_list_for_each (ttmp, txs) {
2997 tx = cfs_list_entry (ttmp, kib_tx_t, tx_list);
2999 if (txs != &conn->ibc_active_txs) {
3000 LASSERT (tx->tx_queued);
3002 LASSERT (!tx->tx_queued);
3003 LASSERT (tx->tx_waiting || tx->tx_sending != 0);
3006 if (cfs_time_aftereq (jiffies, tx->tx_deadline)) {
3007 CERROR("Timed out tx: %s, %lu seconds\n",
3008 kiblnd_queue2str(conn, txs),
3009 cfs_duration_sec(jiffies - tx->tx_deadline));
3018 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3020 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3021 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3022 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3023 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3024 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3028 kiblnd_check_conns (int idx)
3030 CFS_LIST_HEAD (closes);
3031 CFS_LIST_HEAD (checksends);
3032 cfs_list_t *peers = &kiblnd_data.kib_peers[idx];
3037 unsigned long flags;
3039 /* NB. We expect to have a look at all the peers and not find any
3040 * RDMAs to time out, so we just use a shared lock while we
3042 cfs_read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3044 cfs_list_for_each (ptmp, peers) {
3045 peer = cfs_list_entry (ptmp, kib_peer_t, ibp_list);
3047 cfs_list_for_each (ctmp, &peer->ibp_conns) {
3051 conn = cfs_list_entry(ctmp, kib_conn_t, ibc_list);
3053 LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
3055 cfs_spin_lock(&conn->ibc_lock);
3057 sendnoop = kiblnd_need_noop(conn);
3058 timedout = kiblnd_conn_timed_out_locked(conn);
3059 if (!sendnoop && !timedout) {
3060 cfs_spin_unlock(&conn->ibc_lock);
3065 CERROR("Timed out RDMA with %s (%lu): "
3066 "c: %u, oc: %u, rc: %u\n",
3067 libcfs_nid2str(peer->ibp_nid),
3068 cfs_duration_sec(cfs_time_current() -
3069 peer->ibp_last_alive),
3071 conn->ibc_outstanding_credits,
3072 conn->ibc_reserved_credits);
3073 cfs_list_add(&conn->ibc_connd_list, &closes);
3075 cfs_list_add(&conn->ibc_connd_list,
3078 /* +ref for 'closes' or 'checksends' */
3079 kiblnd_conn_addref(conn);
3081 cfs_spin_unlock(&conn->ibc_lock);
3085 cfs_read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3087 /* Handle timeout by closing the whole
3088 * connection. We can only be sure RDMA activity
3089 * has ceased once the QP has been modified. */
3090 while (!cfs_list_empty(&closes)) {
3091 conn = cfs_list_entry(closes.next,
3092 kib_conn_t, ibc_connd_list);
3093 cfs_list_del(&conn->ibc_connd_list);
3094 kiblnd_close_conn(conn, -ETIMEDOUT);
3095 kiblnd_conn_decref(conn);
3098 /* In case we have enough credits to return via a
3099 * NOOP, but there were no non-blocking tx descs
3100 * free to do it last time... */
3101 while (!cfs_list_empty(&checksends)) {
3102 conn = cfs_list_entry(checksends.next,
3103 kib_conn_t, ibc_connd_list);
3104 cfs_list_del(&conn->ibc_connd_list);
3105 kiblnd_check_sends(conn);
3106 kiblnd_conn_decref(conn);
3111 kiblnd_disconnect_conn (kib_conn_t *conn)
3113 LASSERT (!cfs_in_interrupt());
3114 LASSERT (current == kiblnd_data.kib_connd);
3115 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3117 rdma_disconnect(conn->ibc_cmid);
3118 kiblnd_finalise_conn(conn);
3120 kiblnd_peer_notify(conn->ibc_peer);
3124 kiblnd_connd (void *arg)
3126 cfs_waitlink_t wait;
3127 unsigned long flags;
3133 unsigned long deadline = jiffies;
3135 cfs_daemonize ("kiblnd_connd");
3136 cfs_block_allsigs ();
3138 cfs_waitlink_init (&wait);
3139 kiblnd_data.kib_connd = current;
3141 cfs_spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3143 while (!kiblnd_data.kib_shutdown) {
3147 if (!cfs_list_empty (&kiblnd_data.kib_connd_zombies)) {
3148 conn = cfs_list_entry(kiblnd_data. \
3149 kib_connd_zombies.next,
3150 kib_conn_t, ibc_list);
3151 cfs_list_del(&conn->ibc_list);
3153 cfs_spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock,
3157 kiblnd_destroy_conn(conn);
3159 cfs_spin_lock_irqsave (&kiblnd_data.kib_connd_lock,
3163 if (!cfs_list_empty (&kiblnd_data.kib_connd_conns)) {
3164 conn = cfs_list_entry (kiblnd_data.kib_connd_conns.next,
3165 kib_conn_t, ibc_list);
3166 cfs_list_del(&conn->ibc_list);
3168 cfs_spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock,
3172 kiblnd_disconnect_conn(conn);
3173 kiblnd_conn_decref(conn);
3175 cfs_spin_lock_irqsave (&kiblnd_data.kib_connd_lock,
3179 /* careful with the jiffy wrap... */
3180 timeout = (int)(deadline - jiffies);
3184 int chunk = kiblnd_data.kib_peer_hash_size;
3186 cfs_spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3189 /* Time to check for RDMA timeouts on a few more
3190 * peers: I do checks every 'p' seconds on a
3191 * proportion of the peer table and I need to check
3192 * every connection 'n' times within a timeout
3193 * interval, to ensure I detect a timeout on any
3194 * connection within (n+1)/n times the timeout
3197 if (*kiblnd_tunables.kib_timeout > n * p)
3198 chunk = (chunk * n * p) /
3199 *kiblnd_tunables.kib_timeout;
3203 for (i = 0; i < chunk; i++) {
3204 kiblnd_check_conns(peer_index);
3205 peer_index = (peer_index + 1) %
3206 kiblnd_data.kib_peer_hash_size;
3209 deadline += p * CFS_HZ;
3210 cfs_spin_lock_irqsave(&kiblnd_data.kib_connd_lock,
3217 /* Nothing to do for 'timeout' */
3218 cfs_set_current_state (CFS_TASK_INTERRUPTIBLE);
3219 cfs_waitq_add (&kiblnd_data.kib_connd_waitq, &wait);
3220 cfs_spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3222 cfs_waitq_timedwait(&wait, CFS_TASK_INTERRUPTIBLE, timeout);
3224 cfs_set_current_state (CFS_TASK_RUNNING);
3225 cfs_waitq_del (&kiblnd_data.kib_connd_waitq, &wait);
3226 cfs_spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3229 cfs_spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3231 kiblnd_thread_fini();
3236 kiblnd_qp_event(struct ib_event *event, void *arg)
3238 kib_conn_t *conn = arg;
3240 switch (event->event) {
3241 case IB_EVENT_COMM_EST:
3242 CDEBUG(D_NET, "%s established\n",
3243 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3247 CERROR("%s: Async QP event type %d\n",
3248 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3254 kiblnd_complete (struct ib_wc *wc)
3256 switch (kiblnd_wreqid2type(wc->wr_id)) {
3260 case IBLND_WID_RDMA:
3261 /* We only get RDMA completion notification if it fails. All
3262 * subsequent work items, including the final SEND will fail
3263 * too. However we can't print out any more info about the
3264 * failing RDMA because 'tx' might be back on the idle list or
3265 * even reused already if we didn't manage to post all our work
3267 CNETERR("RDMA (tx: %p) failed: %d\n",
3268 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3272 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3276 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3283 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3285 /* NB I'm not allowed to schedule this conn once its refcount has
3286 * reached 0. Since fundamentally I'm racing with scheduler threads
3287 * consuming my CQ I could be called after all completions have
3288 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3289 * and this CQ is about to be destroyed so I NOOP. */
3290 kib_conn_t *conn = (kib_conn_t *)arg;
3291 struct kib_sched_info *sched = conn->ibc_sched;
3292 unsigned long flags;
3294 LASSERT(cq == conn->ibc_cq);
3296 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3298 conn->ibc_ready = 1;
3300 if (!conn->ibc_scheduled &&
3301 (conn->ibc_nrx > 0 ||
3302 conn->ibc_nsends_posted > 0)) {
3303 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3304 conn->ibc_scheduled = 1;
3305 cfs_list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3307 if (cfs_waitq_active(&sched->ibs_waitq))
3308 cfs_waitq_signal(&sched->ibs_waitq);
3311 cfs_spin_unlock_irqrestore(&sched->ibs_lock, flags);
3315 kiblnd_cq_event(struct ib_event *event, void *arg)
3317 kib_conn_t *conn = arg;
3319 CERROR("%s: async CQ event type %d\n",
3320 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3324 kiblnd_scheduler(void *arg)
3326 long id = (long)arg;
3327 struct kib_sched_info *sched;
3329 cfs_waitlink_t wait;
3330 unsigned long flags;
3337 snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
3338 KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3340 cfs_daemonize(name);
3341 cfs_block_allsigs();
3343 cfs_waitlink_init(&wait);
3345 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3347 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3349 CWARN("Failed to bind %s on CPT %d, please verify whether "
3350 "all CPUs are healthy and reload modules if necessary, "
3351 "otherwise your system might under risk of low "
3352 "performance\n", name, sched->ibs_cpt);
3355 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3357 while (!kiblnd_data.kib_shutdown) {
3358 if (busy_loops++ >= IBLND_RESCHED) {
3359 cfs_spin_unlock_irqrestore(&sched->ibs_lock, flags);
3364 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3369 if (!cfs_list_empty(&sched->ibs_conns)) {
3370 conn = cfs_list_entry(sched->ibs_conns.next,
3371 kib_conn_t, ibc_sched_list);
3372 /* take over kib_sched_conns' ref on conn... */
3373 LASSERT(conn->ibc_scheduled);
3374 cfs_list_del(&conn->ibc_sched_list);
3375 conn->ibc_ready = 0;
3377 cfs_spin_unlock_irqrestore(&sched->ibs_lock, flags);
3379 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3381 rc = ib_req_notify_cq(conn->ibc_cq,
3384 CWARN("%s: ib_req_notify_cq failed: %d, "
3385 "closing connection\n",
3386 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3387 kiblnd_close_conn(conn, -EIO);
3388 kiblnd_conn_decref(conn);
3389 cfs_spin_lock_irqsave(&sched->ibs_lock,
3394 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3398 CWARN("%s: ib_poll_cq failed: %d, "
3399 "closing connection\n",
3400 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3402 kiblnd_close_conn(conn, -EIO);
3403 kiblnd_conn_decref(conn);
3404 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3408 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3410 if (rc != 0 || conn->ibc_ready) {
3411 /* There may be another completion waiting; get
3412 * another scheduler to check while I handle
3414 /* +1 ref for sched_conns */
3415 kiblnd_conn_addref(conn);
3416 cfs_list_add_tail(&conn->ibc_sched_list,
3418 if (cfs_waitq_active(&sched->ibs_waitq))
3419 cfs_waitq_signal(&sched->ibs_waitq);
3421 conn->ibc_scheduled = 0;
3425 cfs_spin_unlock_irqrestore(&sched->ibs_lock,
3427 kiblnd_complete(&wc);
3429 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3432 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3439 cfs_set_current_state(CFS_TASK_INTERRUPTIBLE);
3440 cfs_waitq_add_exclusive(&sched->ibs_waitq, &wait);
3441 cfs_spin_unlock_irqrestore(&sched->ibs_lock, flags);
3443 cfs_waitq_wait(&wait, CFS_TASK_INTERRUPTIBLE);
3446 cfs_waitq_del(&sched->ibs_waitq, &wait);
3447 cfs_set_current_state(CFS_TASK_RUNNING);
3448 cfs_spin_lock_irqsave(&sched->ibs_lock, flags);
3451 cfs_spin_unlock_irqrestore(&sched->ibs_lock, flags);
3453 kiblnd_thread_fini();
3458 kiblnd_failover_thread(void *arg)
3460 cfs_rwlock_t *glock = &kiblnd_data.kib_global_lock;
3462 cfs_waitlink_t wait;
3463 unsigned long flags;
3466 LASSERT (*kiblnd_tunables.kib_dev_failover != 0);
3468 cfs_daemonize ("kiblnd_failover");
3469 cfs_block_allsigs ();
3471 cfs_waitlink_init(&wait);
3472 cfs_write_lock_irqsave(glock, flags);
3474 while (!kiblnd_data.kib_shutdown) {
3475 int do_failover = 0;
3478 cfs_list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3480 if (cfs_time_before(cfs_time_current(),
3481 dev->ibd_next_failover))
3488 cfs_list_del_init(&dev->ibd_fail_list);
3489 dev->ibd_failover = 1;
3490 cfs_write_unlock_irqrestore(glock, flags);
3492 rc = kiblnd_dev_failover(dev);
3494 cfs_write_lock_irqsave(glock, flags);
3496 LASSERT (dev->ibd_failover);
3497 dev->ibd_failover = 0;
3498 if (rc >= 0) { /* Device is OK or failover succeed */
3499 dev->ibd_next_failover = cfs_time_shift(3);
3503 /* failed to failover, retry later */
3504 dev->ibd_next_failover =
3505 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3506 if (kiblnd_dev_can_failover(dev)) {
3507 cfs_list_add_tail(&dev->ibd_fail_list,
3508 &kiblnd_data.kib_failed_devs);
3514 /* long sleep if no more pending failover */
3515 long_sleep = cfs_list_empty(&kiblnd_data.kib_failed_devs);
3517 cfs_set_current_state(CFS_TASK_INTERRUPTIBLE);
3518 cfs_waitq_add(&kiblnd_data.kib_failover_waitq, &wait);
3519 cfs_write_unlock_irqrestore(glock, flags);
3521 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3522 cfs_time_seconds(1));
3523 cfs_set_current_state(CFS_TASK_RUNNING);
3524 cfs_waitq_del(&kiblnd_data.kib_failover_waitq, &wait);
3525 cfs_write_lock_irqsave(glock, flags);
3527 if (!long_sleep || rc != 0)
3530 /* have a long sleep, routine check all active devices,
3531 * we need checking like this because if there is not active
3532 * connection on the dev and no SEND from local, we may listen
3533 * on wrong HCA for ever while there is a bonding failover */
3534 cfs_list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3535 if (kiblnd_dev_can_failover(dev)) {
3536 cfs_list_add_tail(&dev->ibd_fail_list,
3537 &kiblnd_data.kib_failed_devs);
3542 cfs_write_unlock_irqrestore(glock, flags);
3544 kiblnd_thread_fini();