1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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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 */
57 kiblnd_unmap_tx(ni, tx);
59 /* tx may have up to 2 lnet msgs to finalise */
60 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
61 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
64 if (tx->tx_conn != NULL) {
65 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
67 kiblnd_conn_decref(tx->tx_conn);
74 spin_lock(&net->ibn_tx_lock);
76 list_add(&tx->tx_list, &net->ibn_idle_txs);
78 spin_unlock(&net->ibn_tx_lock);
80 /* delay finalize until my descs have been freed */
81 for (i = 0; i < 2; i++) {
82 if (lntmsg[i] == NULL)
85 lnet_finalize(ni, lntmsg[i], rc);
90 kiblnd_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int status)
94 while (!list_empty (txlist)) {
95 tx = list_entry (txlist->next, kib_tx_t, tx_list);
97 list_del(&tx->tx_list);
100 tx->tx_status = status;
101 kiblnd_tx_done(ni, tx);
106 kiblnd_get_idle_tx (lnet_ni_t *ni)
108 kib_net_t *net = ni->ni_data;
111 LASSERT (net != NULL);
113 spin_lock(&net->ibn_tx_lock);
115 if (list_empty(&net->ibn_idle_txs)) {
116 spin_unlock(&net->ibn_tx_lock);
120 tx = list_entry(net->ibn_idle_txs.next, kib_tx_t, tx_list);
121 list_del(&tx->tx_list);
123 /* Allocate a new completion cookie. It might not be needed,
124 * but we've got a lock right now and we're unlikely to
126 tx->tx_cookie = net->ibn_tx_next_cookie++;
128 spin_unlock(&net->ibn_tx_lock);
130 LASSERT (tx->tx_nwrq == 0);
131 LASSERT (!tx->tx_queued);
132 LASSERT (tx->tx_sending == 0);
133 LASSERT (!tx->tx_waiting);
134 LASSERT (tx->tx_status == 0);
135 LASSERT (tx->tx_conn == NULL);
136 LASSERT (tx->tx_lntmsg[0] == NULL);
137 LASSERT (tx->tx_lntmsg[1] == NULL);
138 LASSERT (tx->tx_u.fmr == NULL);
139 LASSERT (tx->tx_nfrags == 0);
145 kiblnd_drop_rx (kib_rx_t *rx)
147 kib_conn_t *conn = rx->rx_conn;
150 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
151 LASSERT (conn->ibc_nrx > 0);
153 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
155 kiblnd_conn_decref(conn);
159 kiblnd_post_rx (kib_rx_t *rx, int credit)
161 kib_conn_t *conn = rx->rx_conn;
162 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
163 struct ib_recv_wr *bad_wrq = NULL;
167 LASSERT (net != NULL);
168 LASSERT (!in_interrupt());
169 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
170 credit == IBLND_POSTRX_PEER_CREDIT ||
171 credit == IBLND_POSTRX_RSRVD_CREDIT);
173 mr = kiblnd_find_dma_mr(net, rx->rx_msgaddr, IBLND_MSG_SIZE);
174 LASSERT (mr != NULL);
176 rx->rx_sge.lkey = mr->lkey;
177 rx->rx_sge.addr = rx->rx_msgaddr;
178 rx->rx_sge.length = IBLND_MSG_SIZE;
180 rx->rx_wrq.next = NULL;
181 rx->rx_wrq.sg_list = &rx->rx_sge;
182 rx->rx_wrq.num_sge = 1;
183 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
185 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
186 LASSERT (rx->rx_nob >= 0); /* not posted */
188 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
189 kiblnd_drop_rx(rx); /* No more posts for this rx */
193 rx->rx_nob = -1; /* flag posted */
195 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
197 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
198 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
202 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
206 kiblnd_close_conn(conn, rc);
207 kiblnd_drop_rx(rx); /* No more posts for this rx */
211 if (credit == IBLND_POSTRX_NO_CREDIT)
214 spin_lock(&conn->ibc_lock);
215 if (credit == IBLND_POSTRX_PEER_CREDIT)
216 conn->ibc_outstanding_credits++;
218 conn->ibc_reserved_credits++;
219 spin_unlock(&conn->ibc_lock);
221 kiblnd_check_sends(conn);
226 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
228 struct list_head *tmp;
230 list_for_each(tmp, &conn->ibc_active_txs) {
231 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
233 LASSERT (!tx->tx_queued);
234 LASSERT (tx->tx_sending != 0 || tx->tx_waiting);
236 if (tx->tx_cookie != cookie)
239 if (tx->tx_waiting &&
240 tx->tx_msg->ibm_type == txtype)
243 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
244 tx->tx_waiting ? "" : "NOT ",
245 tx->tx_msg->ibm_type, txtype);
251 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
254 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
257 spin_lock(&conn->ibc_lock);
259 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
261 spin_unlock(&conn->ibc_lock);
263 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
264 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
265 kiblnd_close_conn(conn, -EPROTO);
269 if (tx->tx_status == 0) { /* success so far */
270 if (status < 0) { /* failed? */
271 tx->tx_status = status;
272 } else if (txtype == IBLND_MSG_GET_REQ) {
273 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
279 idle = !tx->tx_queued && (tx->tx_sending == 0);
281 list_del(&tx->tx_list);
283 spin_unlock(&conn->ibc_lock);
286 kiblnd_tx_done(ni, tx);
290 kiblnd_send_completion (kib_conn_t *conn, int type, int status, __u64 cookie)
292 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
293 kib_tx_t *tx = kiblnd_get_idle_tx(ni);
296 CERROR("Can't get tx for completion %x for %s\n",
297 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
301 tx->tx_msg->ibm_u.completion.ibcm_status = status;
302 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
303 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
305 kiblnd_queue_tx(tx, conn);
309 kiblnd_handle_rx (kib_rx_t *rx)
311 kib_msg_t *msg = rx->rx_msg;
312 kib_conn_t *conn = rx->rx_conn;
313 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
314 int credits = msg->ibm_credits;
320 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
322 CDEBUG (D_NET, "Received %x[%d] from %s\n",
323 msg->ibm_type, credits, libcfs_nid2str(conn->ibc_peer->ibp_nid));
326 /* Have I received credits that will let me send? */
327 spin_lock(&conn->ibc_lock);
329 if (conn->ibc_credits + credits >
330 IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
331 rc2 = conn->ibc_credits;
332 spin_unlock(&conn->ibc_lock);
334 CERROR("Bad credits from %s: %d + %d > %d\n",
335 libcfs_nid2str(conn->ibc_peer->ibp_nid),
336 rc2, credits, IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
338 kiblnd_close_conn(conn, -EPROTO);
339 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
343 conn->ibc_credits += credits;
345 spin_unlock(&conn->ibc_lock);
346 kiblnd_check_sends(conn);
349 switch (msg->ibm_type) {
351 CERROR("Bad IBLND message type %x from %s\n",
352 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
353 post_credit = IBLND_POSTRX_NO_CREDIT;
358 if (IBLND_OOB_CAPABLE(conn->ibc_version))
359 post_credit = IBLND_POSTRX_NO_CREDIT;
361 post_credit = IBLND_POSTRX_PEER_CREDIT;
364 case IBLND_MSG_IMMEDIATE:
365 post_credit = IBLND_POSTRX_DONT_POST;
366 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
367 msg->ibm_srcnid, rx, 0);
368 if (rc < 0) /* repost on error */
369 post_credit = IBLND_POSTRX_PEER_CREDIT;
372 case IBLND_MSG_PUT_REQ:
373 post_credit = IBLND_POSTRX_DONT_POST;
374 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
375 msg->ibm_srcnid, rx, 1);
376 if (rc < 0) /* repost on error */
377 post_credit = IBLND_POSTRX_PEER_CREDIT;
380 case IBLND_MSG_PUT_NAK:
381 CWARN ("PUT_NACK from %s\n", libcfs_nid2str(conn->ibc_peer->ibp_nid));
382 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
383 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
384 msg->ibm_u.completion.ibcm_status,
385 msg->ibm_u.completion.ibcm_cookie);
388 case IBLND_MSG_PUT_ACK:
389 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
391 spin_lock(&conn->ibc_lock);
392 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
393 msg->ibm_u.putack.ibpam_src_cookie);
395 list_del(&tx->tx_list);
396 spin_unlock(&conn->ibc_lock);
399 CERROR("Unmatched PUT_ACK from %s\n",
400 libcfs_nid2str(conn->ibc_peer->ibp_nid));
405 LASSERT (tx->tx_waiting);
406 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
407 * (a) I can overwrite tx_msg since my peer has received it!
408 * (b) tx_waiting set tells tx_complete() it's not done. */
410 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
412 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
413 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
414 &msg->ibm_u.putack.ibpam_rd,
415 msg->ibm_u.putack.ibpam_dst_cookie);
417 CERROR("Can't setup rdma for PUT to %s: %d\n",
418 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
420 spin_lock(&conn->ibc_lock);
421 tx->tx_waiting = 0; /* clear waiting and queue atomically */
422 kiblnd_queue_tx_locked(tx, conn);
423 spin_unlock(&conn->ibc_lock);
426 case IBLND_MSG_PUT_DONE:
427 post_credit = IBLND_POSTRX_PEER_CREDIT;
428 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
429 msg->ibm_u.completion.ibcm_status,
430 msg->ibm_u.completion.ibcm_cookie);
433 case IBLND_MSG_GET_REQ:
434 post_credit = IBLND_POSTRX_DONT_POST;
435 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
436 msg->ibm_srcnid, rx, 1);
437 if (rc < 0) /* repost on error */
438 post_credit = IBLND_POSTRX_PEER_CREDIT;
441 case IBLND_MSG_GET_DONE:
442 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
443 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
444 msg->ibm_u.completion.ibcm_status,
445 msg->ibm_u.completion.ibcm_cookie);
449 if (rc < 0) /* protocol error */
450 kiblnd_close_conn(conn, rc);
452 if (post_credit != IBLND_POSTRX_DONT_POST)
453 kiblnd_post_rx(rx, post_credit);
457 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
459 kib_msg_t *msg = rx->rx_msg;
460 kib_conn_t *conn = rx->rx_conn;
461 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
462 kib_net_t *net = ni->ni_data;
466 LASSERT (net != NULL);
467 LASSERT (rx->rx_nob < 0); /* was posted */
468 rx->rx_nob = 0; /* isn't now */
470 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
473 if (status != IB_WC_SUCCESS) {
474 CDEBUG(D_NETERROR, "Rx from %s failed: %d\n",
475 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
482 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
484 CERROR ("Error %d unpacking rx from %s\n",
485 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
489 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
490 msg->ibm_dstnid != ni->ni_nid ||
491 msg->ibm_srcstamp != conn->ibc_incarnation ||
492 msg->ibm_dststamp != net->ibn_incarnation) {
493 CERROR ("Stale rx from %s\n",
494 libcfs_nid2str(conn->ibc_peer->ibp_nid));
499 /* set time last known alive */
500 kiblnd_peer_alive(conn->ibc_peer);
502 /* racing with connection establishment/teardown! */
504 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
505 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
508 write_lock_irqsave(g_lock, flags);
509 /* must check holding global lock to eliminate race */
510 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
511 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
512 write_unlock_irqrestore(g_lock, flags);
515 write_unlock_irqrestore(g_lock, flags);
517 kiblnd_handle_rx(rx);
521 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
522 kiblnd_close_conn(conn, err);
524 kiblnd_drop_rx(rx); /* Don't re-post rx. */
528 kiblnd_kvaddr_to_page (unsigned long vaddr)
532 if (vaddr >= VMALLOC_START &&
533 vaddr < VMALLOC_END) {
534 page = vmalloc_to_page ((void *)vaddr);
535 LASSERT (page != NULL);
538 #ifdef CONFIG_HIGHMEM
539 if (vaddr >= PKMAP_BASE &&
540 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
541 /* No highmem pages only used for bulk (kiov) I/O */
542 CERROR("find page for address in highmem\n");
546 page = virt_to_page (vaddr);
547 LASSERT (page != NULL);
552 kiblnd_fmr_unmap_tx(kib_net_t *net, kib_tx_t *tx)
556 if (tx->tx_u.fmr == NULL)
559 rc = ib_fmr_pool_unmap(tx->tx_u.fmr);
562 if (tx->tx_status != 0) {
563 rc = ib_flush_fmr_pool(net->ibn_fmrpool);
571 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
573 struct ib_pool_fmr *fmr;
574 kib_dev_t *ibdev = net->ibn_dev;
575 __u64 *pages = tx->tx_pages;
580 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
581 for (size = 0; size < rd->rd_frags[i].rf_nob;
582 size += ibdev->ibd_page_size) {
583 pages[npages ++] = (rd->rd_frags[i].rf_addr &
584 ibdev->ibd_page_mask) + size;
588 fmr = ib_fmr_pool_map_phys(net->ibn_fmrpool, pages, npages, 0);
591 CERROR ("Can't map %d pages: %ld\n", npages, PTR_ERR(fmr));
595 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
597 rd->rd_key = (rd != tx->tx_rd) ? fmr->fmr->rkey :
599 rd->rd_frags[0].rf_addr &= ~ibdev->ibd_page_mask;
600 rd->rd_frags[0].rf_nob = nob;
609 kiblnd_pmr_unmap_tx(kib_net_t *net, kib_tx_t *tx)
611 if (tx->tx_u.pmr == NULL)
614 kiblnd_phys_mr_unmap(net, tx->tx_u.pmr);
620 kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
625 iova = rd->rd_frags[0].rf_addr & ~net->ibn_dev->ibd_page_mask;
627 pmr = kiblnd_phys_mr_map(net, rd, tx->tx_ipb, &iova);
629 CERROR("Failed to create MR by phybuf\n");
633 rd->rd_key = (rd != tx->tx_rd) ? pmr->ibpm_mr->rkey :
636 rd->rd_frags[0].rf_addr = iova;
637 rd->rd_frags[0].rf_nob = nob;
645 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
647 kib_net_t *net = ni->ni_data;
649 LASSERT (net != NULL);
651 if (net->ibn_fmrpool != NULL)
652 kiblnd_fmr_unmap_tx(net, tx);
653 else if (net->ibn_pmrpool != NULL)
654 kiblnd_pmr_unmap_tx(net, tx);
656 if (tx->tx_nfrags != 0) {
657 kiblnd_dma_unmap_sg(net->ibn_dev->ibd_cmid->device,
658 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
664 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
665 kib_rdma_desc_t *rd, int nfrags)
667 kib_net_t *net = ni->ni_data;
668 struct ib_mr *mr = NULL;
672 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
674 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
675 tx->tx_nfrags = nfrags;
678 kiblnd_dma_map_sg(net->ibn_dev->ibd_cmid->device,
679 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
681 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
682 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
683 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
684 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
685 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
686 nob += rd->rd_frags[i].rf_nob;
689 /* looking for pre-mapping MR */
690 mr = kiblnd_find_rd_dma_mr(net, rd);
692 /* found pre-mapping MR */
693 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
697 if (net->ibn_fmrpool != NULL)
698 return kiblnd_fmr_map_tx(net, tx, rd, nob);
700 if (net->ibn_pmrpool != NULL);
701 return kiblnd_pmr_map_tx(net, tx, rd, nob);
708 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
709 unsigned int niov, struct iovec *iov, int offset, int nob)
711 kib_net_t *net = ni->ni_data;
713 struct scatterlist *sg;
720 LASSERT (net != NULL);
722 while (offset >= iov->iov_len) {
723 offset -= iov->iov_len;
733 vaddr = ((unsigned long)iov->iov_base) + offset;
734 page_offset = vaddr & (PAGE_SIZE - 1);
735 page = kiblnd_kvaddr_to_page(vaddr);
737 CERROR ("Can't find page\n");
741 fragnob = min((int)(iov->iov_len - offset), nob);
742 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
744 sg_set_page(sg, page, fragnob, page_offset);
747 if (offset + fragnob < iov->iov_len) {
757 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
761 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
762 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
764 kib_net_t *net = ni->ni_data;
765 struct scatterlist *sg;
768 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
772 LASSERT (net != NULL);
774 while (offset >= kiov->kiov_len) {
775 offset -= kiov->kiov_len;
785 fragnob = min((int)(kiov->kiov_len - offset), nob);
787 memset(sg, 0, sizeof(*sg));
788 sg_set_page(sg, kiov->kiov_page, fragnob,
789 kiov->kiov_offset + offset);
798 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
802 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
804 kib_msg_t *msg = tx->tx_msg;
805 kib_peer_t *peer = conn->ibc_peer;
806 int ver = conn->ibc_version;
809 struct ib_send_wr *bad_wrq;
811 LASSERT (tx->tx_queued);
812 /* We rely on this for QP sizing */
813 LASSERT (tx->tx_nwrq > 0);
814 LASSERT (tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
816 LASSERT (credit == 0 || credit == 1);
817 LASSERT (conn->ibc_outstanding_credits >= 0);
818 LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
819 LASSERT (conn->ibc_credits >= 0);
820 LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
822 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
823 /* tx completions outstanding... */
824 CDEBUG(D_NET, "%s: posted enough\n",
825 libcfs_nid2str(peer->ibp_nid));
829 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
830 CDEBUG(D_NET, "%s: no credits\n",
831 libcfs_nid2str(peer->ibp_nid));
835 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
836 conn->ibc_credits == 1 && /* last credit reserved for */
837 conn->ibc_outstanding_credits == 0) { /* giving back credits */
838 CDEBUG(D_NET, "%s: not using last credit\n",
839 libcfs_nid2str(peer->ibp_nid));
843 /* NB don't drop ibc_lock before bumping tx_sending */
844 list_del(&tx->tx_list);
847 if (msg->ibm_type == IBLND_MSG_NOOP &&
848 (!kiblnd_send_noop(conn) || /* redundant NOOP */
849 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
850 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
851 /* OK to drop when posted enough NOOPs, since
852 * kiblnd_check_sends will queue NOOP again when
853 * posted NOOPs complete */
854 spin_unlock(&conn->ibc_lock);
855 kiblnd_tx_done(peer->ibp_ni, tx);
856 spin_lock(&conn->ibc_lock);
857 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
858 libcfs_nid2str(peer->ibp_nid),
859 conn->ibc_noops_posted);
863 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
864 peer->ibp_nid, conn->ibc_incarnation);
866 conn->ibc_credits -= credit;
867 conn->ibc_outstanding_credits = 0;
868 conn->ibc_nsends_posted++;
869 if (msg->ibm_type == IBLND_MSG_NOOP)
870 conn->ibc_noops_posted++;
872 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
873 * PUT. If so, it was first queued here as a PUT_REQ, sent and
874 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
875 * and then re-queued here. It's (just) possible that
876 * tx_sending is non-zero if we've not done the tx_complete()
877 * from the first send; hence the ++ rather than = below. */
879 list_add(&tx->tx_list, &conn->ibc_active_txs);
881 /* I'm still holding ibc_lock! */
882 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
885 rc = ib_post_send(conn->ibc_cmid->qp,
886 tx->tx_wrq, &bad_wrq);
887 conn->ibc_last_send = jiffies;
892 /* NB credits are transferred in the actual
893 * message, which can only be the last work item */
894 conn->ibc_credits += credit;
895 conn->ibc_outstanding_credits += msg->ibm_credits;
896 conn->ibc_nsends_posted--;
897 if (msg->ibm_type == IBLND_MSG_NOOP)
898 conn->ibc_noops_posted--;
904 done = (tx->tx_sending == 0);
906 list_del(&tx->tx_list);
908 spin_unlock(&conn->ibc_lock);
910 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
911 CERROR("Error %d posting transmit to %s\n",
912 rc, libcfs_nid2str(peer->ibp_nid));
914 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
915 rc, libcfs_nid2str(peer->ibp_nid));
917 kiblnd_close_conn(conn, rc);
920 kiblnd_tx_done(peer->ibp_ni, tx);
925 kiblnd_check_sends (kib_conn_t *conn)
927 int ver = conn->ibc_version;
928 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
931 /* Don't send anything until after the connection is established */
932 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
933 CDEBUG(D_NET, "%s too soon\n",
934 libcfs_nid2str(conn->ibc_peer->ibp_nid));
938 spin_lock(&conn->ibc_lock);
940 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
941 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
942 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
943 LASSERT (conn->ibc_reserved_credits >= 0);
945 while (conn->ibc_reserved_credits > 0 &&
946 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
947 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
949 list_del(&tx->tx_list);
950 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
951 conn->ibc_reserved_credits--;
954 if (kiblnd_send_noop(conn)) {
955 spin_unlock(&conn->ibc_lock);
957 tx = kiblnd_get_idle_tx(ni);
959 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
961 spin_lock(&conn->ibc_lock);
963 kiblnd_queue_tx_locked(tx, conn);
969 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
971 tx = list_entry(conn->ibc_tx_queue_nocred.next,
973 } else if (!list_empty(&conn->ibc_tx_queue)) {
975 tx = list_entry(conn->ibc_tx_queue.next,
980 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
984 spin_unlock(&conn->ibc_lock);
988 kiblnd_tx_complete (kib_tx_t *tx, int status)
990 int failed = (status != IB_WC_SUCCESS);
991 kib_conn_t *conn = tx->tx_conn;
994 LASSERT (tx->tx_sending > 0);
997 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
998 CDEBUG(D_NETERROR, "Tx -> %s cookie "LPX64
999 " sending %d waiting %d: failed %d\n",
1000 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1001 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1004 kiblnd_close_conn(conn, -EIO);
1006 kiblnd_peer_alive(conn->ibc_peer);
1009 spin_lock(&conn->ibc_lock);
1011 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1012 * gets to free it, which also drops its ref on 'conn'. */
1015 conn->ibc_nsends_posted--;
1016 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1017 conn->ibc_noops_posted--;
1020 tx->tx_waiting = 0; /* don't wait for peer */
1021 tx->tx_status = -EIO;
1024 idle = (tx->tx_sending == 0) && /* This is the final callback */
1025 !tx->tx_waiting && /* Not waiting for peer */
1026 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1028 list_del(&tx->tx_list);
1030 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1032 spin_unlock(&conn->ibc_lock);
1035 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1037 kiblnd_check_sends(conn);
1039 kiblnd_conn_decref(conn); /* ...until here */
1043 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1045 kib_net_t *net = ni->ni_data;
1046 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1047 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1048 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1051 LASSERT (net != NULL);
1052 LASSERT (tx->tx_nwrq >= 0);
1053 LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1054 LASSERT (nob <= IBLND_MSG_SIZE);
1056 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1058 mr = kiblnd_find_dma_mr(net, tx->tx_msgaddr, nob);
1059 LASSERT (mr != NULL);
1061 sge->lkey = mr->lkey;
1062 sge->addr = tx->tx_msgaddr;
1065 memset(wrq, 0, sizeof(*wrq));
1068 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1071 wrq->opcode = IB_WR_SEND;
1072 wrq->send_flags = IB_SEND_SIGNALED;
1078 kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1079 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1081 kib_msg_t *ibmsg = tx->tx_msg;
1082 kib_rdma_desc_t *srcrd = tx->tx_rd;
1083 struct ib_sge *sge = &tx->tx_sge[0];
1084 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1090 LASSERT (!in_interrupt());
1091 LASSERT (tx->tx_nwrq == 0);
1092 LASSERT (type == IBLND_MSG_GET_DONE ||
1093 type == IBLND_MSG_PUT_DONE);
1095 srcidx = dstidx = 0;
1098 if (srcidx >= srcrd->rd_nfrags) {
1099 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1104 if (dstidx == dstrd->rd_nfrags) {
1105 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1110 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1111 CERROR("RDMA too fragmented for %s (%d): "
1112 "%d/%d src %d/%d dst frags\n",
1113 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1114 IBLND_RDMA_FRAGS(conn->ibc_version),
1115 srcidx, srcrd->rd_nfrags,
1116 dstidx, dstrd->rd_nfrags);
1121 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1122 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1124 sge = &tx->tx_sge[tx->tx_nwrq];
1125 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1126 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1127 sge->length = wrknob;
1129 wrq = &tx->tx_wrq[tx->tx_nwrq];
1131 wrq->next = wrq + 1;
1132 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1135 wrq->opcode = IB_WR_RDMA_WRITE;
1136 wrq->send_flags = 0;
1138 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1139 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1141 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1142 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1151 if (rc < 0) /* no RDMA if completing with failure */
1154 ibmsg->ibm_u.completion.ibcm_status = rc;
1155 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1156 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1157 type, sizeof (kib_completion_msg_t));
1163 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1165 struct list_head *q;
1167 LASSERT (tx->tx_nwrq > 0); /* work items set up */
1168 LASSERT (!tx->tx_queued); /* not queued for sending already */
1169 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1172 tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
1174 if (tx->tx_conn == NULL) {
1175 kiblnd_conn_addref(conn);
1177 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1179 /* PUT_DONE first attached to conn as a PUT_REQ */
1180 LASSERT (tx->tx_conn == conn);
1181 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1184 switch (tx->tx_msg->ibm_type) {
1188 case IBLND_MSG_PUT_REQ:
1189 case IBLND_MSG_GET_REQ:
1190 q = &conn->ibc_tx_queue_rsrvd;
1193 case IBLND_MSG_PUT_NAK:
1194 case IBLND_MSG_PUT_ACK:
1195 case IBLND_MSG_PUT_DONE:
1196 case IBLND_MSG_GET_DONE:
1197 q = &conn->ibc_tx_queue_nocred;
1200 case IBLND_MSG_NOOP:
1201 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1202 q = &conn->ibc_tx_queue_nocred;
1204 q = &conn->ibc_tx_queue;
1207 case IBLND_MSG_IMMEDIATE:
1208 q = &conn->ibc_tx_queue;
1212 list_add_tail(&tx->tx_list, q);
1216 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1218 spin_lock(&conn->ibc_lock);
1219 kiblnd_queue_tx_locked(tx, conn);
1220 spin_unlock(&conn->ibc_lock);
1222 kiblnd_check_sends(conn);
1226 kiblnd_connect_peer (kib_peer_t *peer)
1228 struct rdma_cm_id *cmid;
1229 kib_net_t *net = peer->ibp_ni->ni_data;
1230 struct sockaddr_in srcaddr;
1231 struct sockaddr_in dstaddr;
1234 LASSERT (net != NULL);
1235 LASSERT (peer->ibp_connecting > 0);
1237 cmid = rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP);
1239 CERROR("Can't create CMID for %s: %ld\n",
1240 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1245 memset(&srcaddr, 0, sizeof(srcaddr));
1246 srcaddr.sin_family = AF_INET;
1247 srcaddr.sin_addr.s_addr = htonl(net->ibn_dev->ibd_ifip);
1249 memset(&dstaddr, 0, sizeof(dstaddr));
1250 dstaddr.sin_family = AF_INET;
1251 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1252 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1254 kiblnd_peer_addref(peer); /* cmid's ref */
1256 rc = rdma_resolve_addr(cmid,
1257 (struct sockaddr *)&srcaddr,
1258 (struct sockaddr *)&dstaddr,
1259 *kiblnd_tunables.kib_timeout * 1000);
1263 /* Can't initiate address resolution: */
1264 CERROR("Can't resolve addr for %s: %d\n",
1265 libcfs_nid2str(peer->ibp_nid), rc);
1267 kiblnd_peer_decref(peer); /* cmid's ref */
1268 rdma_destroy_id(cmid);
1270 kiblnd_peer_connect_failed(peer, 1, rc);
1274 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1279 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1280 unsigned long flags;
1283 /* If I get here, I've committed to send, so I complete the tx with
1284 * failure on any problems */
1286 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1287 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1289 /* First time, just use a read lock since I expect to find my peer
1291 read_lock_irqsave(g_lock, flags);
1293 peer = kiblnd_find_peer_locked(nid);
1294 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1295 /* Found a peer with an established connection */
1296 conn = kiblnd_get_conn_locked(peer);
1297 kiblnd_conn_addref(conn); /* 1 ref for me... */
1299 read_unlock_irqrestore(g_lock, flags);
1302 kiblnd_queue_tx(tx, conn);
1303 kiblnd_conn_decref(conn); /* ...to here */
1307 read_unlock(g_lock);
1308 /* Re-try with a write lock */
1311 peer = kiblnd_find_peer_locked(nid);
1313 if (list_empty(&peer->ibp_conns)) {
1314 /* found a peer, but it's still connecting... */
1315 LASSERT (peer->ibp_connecting != 0 ||
1316 peer->ibp_accepting != 0);
1318 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1319 write_unlock_irqrestore(g_lock, flags);
1321 conn = kiblnd_get_conn_locked(peer);
1322 kiblnd_conn_addref(conn); /* 1 ref for me... */
1324 write_unlock_irqrestore(g_lock, flags);
1327 kiblnd_queue_tx(tx, conn);
1328 kiblnd_conn_decref(conn); /* ...to here */
1333 write_unlock_irqrestore(g_lock, flags);
1335 /* Allocate a peer ready to add to the peer table and retry */
1336 rc = kiblnd_create_peer(ni, &peer, nid);
1338 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1340 tx->tx_status = -EHOSTUNREACH;
1342 kiblnd_tx_done(ni, tx);
1347 write_lock_irqsave(g_lock, flags);
1349 peer2 = kiblnd_find_peer_locked(nid);
1350 if (peer2 != NULL) {
1351 if (list_empty(&peer2->ibp_conns)) {
1352 /* found a peer, but it's still connecting... */
1353 LASSERT (peer2->ibp_connecting != 0 ||
1354 peer2->ibp_accepting != 0);
1356 list_add_tail(&tx->tx_list, &peer2->ibp_tx_queue);
1357 write_unlock_irqrestore(g_lock, flags);
1359 conn = kiblnd_get_conn_locked(peer2);
1360 kiblnd_conn_addref(conn); /* 1 ref for me... */
1362 write_unlock_irqrestore(g_lock, flags);
1365 kiblnd_queue_tx(tx, conn);
1366 kiblnd_conn_decref(conn); /* ...to here */
1369 kiblnd_peer_decref(peer);
1373 /* Brand new peer */
1374 LASSERT (peer->ibp_connecting == 0);
1375 peer->ibp_connecting = 1;
1377 /* always called with a ref on ni, which prevents ni being shutdown */
1378 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1381 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1383 kiblnd_peer_addref(peer);
1384 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1386 write_unlock_irqrestore(g_lock, flags);
1388 kiblnd_connect_peer(peer);
1389 kiblnd_peer_decref(peer);
1393 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1395 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1396 int type = lntmsg->msg_type;
1397 lnet_process_id_t target = lntmsg->msg_target;
1398 int target_is_router = lntmsg->msg_target_is_router;
1399 int routing = lntmsg->msg_routing;
1400 unsigned int payload_niov = lntmsg->msg_niov;
1401 struct iovec *payload_iov = lntmsg->msg_iov;
1402 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1403 unsigned int payload_offset = lntmsg->msg_offset;
1404 unsigned int payload_nob = lntmsg->msg_len;
1410 /* NB 'private' is different depending on what we're sending.... */
1412 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1413 payload_nob, payload_niov, libcfs_id2str(target));
1415 LASSERT (payload_nob == 0 || payload_niov > 0);
1416 LASSERT (payload_niov <= LNET_MAX_IOV);
1418 /* Thread context */
1419 LASSERT (!in_interrupt());
1420 /* payload is either all vaddrs or all pages */
1421 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1429 LASSERT (payload_nob == 0);
1433 if (routing || target_is_router)
1434 break; /* send IMMEDIATE */
1436 /* is the REPLY message too small for RDMA? */
1437 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1438 if (nob <= IBLND_MSG_SIZE)
1439 break; /* send IMMEDIATE */
1441 tx = kiblnd_get_idle_tx(ni);
1443 CERROR("Can allocate txd for GET to %s: \n",
1444 libcfs_nid2str(target.nid));
1450 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1451 rc = kiblnd_setup_rd_iov(ni, tx,
1452 &ibmsg->ibm_u.get.ibgm_rd,
1453 lntmsg->msg_md->md_niov,
1454 lntmsg->msg_md->md_iov.iov,
1455 0, lntmsg->msg_md->md_length);
1457 rc = kiblnd_setup_rd_kiov(ni, tx,
1458 &ibmsg->ibm_u.get.ibgm_rd,
1459 lntmsg->msg_md->md_niov,
1460 lntmsg->msg_md->md_iov.kiov,
1461 0, lntmsg->msg_md->md_length);
1463 CERROR("Can't setup GET sink for %s: %d\n",
1464 libcfs_nid2str(target.nid), rc);
1465 kiblnd_tx_done(ni, tx);
1469 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1470 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1471 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1473 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1475 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1476 if (tx->tx_lntmsg[1] == NULL) {
1477 CERROR("Can't create reply for GET -> %s\n",
1478 libcfs_nid2str(target.nid));
1479 kiblnd_tx_done(ni, tx);
1483 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1484 tx->tx_waiting = 1; /* waiting for GET_DONE */
1485 kiblnd_launch_tx(ni, tx, target.nid);
1488 case LNET_MSG_REPLY:
1490 /* Is the payload small enough not to need RDMA? */
1491 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1492 if (nob <= IBLND_MSG_SIZE)
1493 break; /* send IMMEDIATE */
1495 tx = kiblnd_get_idle_tx(ni);
1497 CERROR("Can't allocate %s txd for %s\n",
1498 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1499 libcfs_nid2str(target.nid));
1503 if (payload_kiov == NULL)
1504 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1505 payload_niov, payload_iov,
1506 payload_offset, payload_nob);
1508 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1509 payload_niov, payload_kiov,
1510 payload_offset, payload_nob);
1512 CERROR("Can't setup PUT src for %s: %d\n",
1513 libcfs_nid2str(target.nid), rc);
1514 kiblnd_tx_done(ni, tx);
1519 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1520 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1521 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1523 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1524 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1525 kiblnd_launch_tx(ni, tx, target.nid);
1529 /* send IMMEDIATE */
1531 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1534 tx = kiblnd_get_idle_tx(ni);
1536 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1537 type, libcfs_nid2str(target.nid));
1542 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1544 if (payload_kiov != NULL)
1545 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1546 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1547 payload_niov, payload_kiov,
1548 payload_offset, payload_nob);
1550 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1551 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1552 payload_niov, payload_iov,
1553 payload_offset, payload_nob);
1555 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1556 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1558 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1559 kiblnd_launch_tx(ni, tx, target.nid);
1564 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1566 lnet_process_id_t target = lntmsg->msg_target;
1567 unsigned int niov = lntmsg->msg_niov;
1568 struct iovec *iov = lntmsg->msg_iov;
1569 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1570 unsigned int offset = lntmsg->msg_offset;
1571 unsigned int nob = lntmsg->msg_len;
1575 tx = kiblnd_get_idle_tx(ni);
1577 CERROR("Can't get tx for REPLY to %s\n",
1578 libcfs_nid2str(target.nid));
1584 else if (kiov == NULL)
1585 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1586 niov, iov, offset, nob);
1588 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1589 niov, kiov, offset, nob);
1592 CERROR("Can't setup GET src for %s: %d\n",
1593 libcfs_nid2str(target.nid), rc);
1597 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1598 IBLND_MSG_GET_DONE, nob,
1599 &rx->rx_msg->ibm_u.get.ibgm_rd,
1600 rx->rx_msg->ibm_u.get.ibgm_cookie);
1602 CERROR("Can't setup rdma for GET from %s: %d\n",
1603 libcfs_nid2str(target.nid), rc);
1608 /* No RDMA: local completion may happen now! */
1609 lnet_finalize(ni, lntmsg, 0);
1611 /* RDMA: lnet_finalize(lntmsg) when it
1613 tx->tx_lntmsg[0] = lntmsg;
1616 kiblnd_queue_tx(tx, rx->rx_conn);
1620 kiblnd_tx_done(ni, tx);
1622 lnet_finalize(ni, lntmsg, -EIO);
1626 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1627 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1628 unsigned int offset, unsigned int mlen, unsigned int rlen)
1630 kib_rx_t *rx = private;
1631 kib_msg_t *rxmsg = rx->rx_msg;
1632 kib_conn_t *conn = rx->rx_conn;
1636 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1639 LASSERT (mlen <= rlen);
1640 LASSERT (!in_interrupt());
1641 /* Either all pages or all vaddrs */
1642 LASSERT (!(kiov != NULL && iov != NULL));
1644 switch (rxmsg->ibm_type) {
1648 case IBLND_MSG_IMMEDIATE:
1649 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1650 if (nob > rx->rx_nob) {
1651 CERROR ("Immediate message from %s too big: %d(%d)\n",
1652 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1659 lnet_copy_flat2kiov(niov, kiov, offset,
1660 IBLND_MSG_SIZE, rxmsg,
1661 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1664 lnet_copy_flat2iov(niov, iov, offset,
1665 IBLND_MSG_SIZE, rxmsg,
1666 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1668 lnet_finalize (ni, lntmsg, 0);
1671 case IBLND_MSG_PUT_REQ:
1673 lnet_finalize(ni, lntmsg, 0);
1674 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1675 rxmsg->ibm_u.putreq.ibprm_cookie);
1679 tx = kiblnd_get_idle_tx(ni);
1681 CERROR("Can't allocate tx for %s\n",
1682 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1683 /* Not replying will break the connection */
1690 rc = kiblnd_setup_rd_iov(ni, tx,
1691 &txmsg->ibm_u.putack.ibpam_rd,
1692 niov, iov, offset, mlen);
1694 rc = kiblnd_setup_rd_kiov(ni, tx,
1695 &txmsg->ibm_u.putack.ibpam_rd,
1696 niov, kiov, offset, mlen);
1698 CERROR("Can't setup PUT sink for %s: %d\n",
1699 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1700 kiblnd_tx_done(ni, tx);
1701 /* tell peer it's over */
1702 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1703 rxmsg->ibm_u.putreq.ibprm_cookie);
1707 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1708 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1709 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1711 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1713 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1714 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1715 kiblnd_queue_tx(tx, conn);
1717 /* reposted buffer reserved for PUT_DONE */
1718 post_credit = IBLND_POSTRX_NO_CREDIT;
1721 case IBLND_MSG_GET_REQ:
1722 if (lntmsg != NULL) {
1723 /* Optimized GET; RDMA lntmsg's payload */
1724 kiblnd_reply(ni, rx, lntmsg);
1726 /* GET didn't match anything */
1727 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1729 rxmsg->ibm_u.get.ibgm_cookie);
1734 kiblnd_post_rx(rx, post_credit);
1739 kiblnd_thread_start (int (*fn)(void *arg), void *arg)
1741 long pid = kernel_thread (fn, arg, 0);
1746 atomic_inc (&kiblnd_data.kib_nthreads);
1751 kiblnd_thread_fini (void)
1753 atomic_dec (&kiblnd_data.kib_nthreads);
1757 kiblnd_peer_alive (kib_peer_t *peer)
1759 /* This is racy, but everyone's only writing cfs_time_current() */
1760 peer->ibp_last_alive = cfs_time_current();
1765 kiblnd_peer_notify (kib_peer_t *peer)
1767 time_t last_alive = 0;
1769 unsigned long flags;
1771 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1773 if (list_empty(&peer->ibp_conns) &&
1774 peer->ibp_accepting == 0 &&
1775 peer->ibp_connecting == 0 &&
1776 peer->ibp_error != 0) {
1777 error = peer->ibp_error;
1778 peer->ibp_error = 0;
1780 last_alive = cfs_time_current_sec() -
1781 cfs_duration_sec(cfs_time_current() -
1782 peer->ibp_last_alive);
1785 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1788 lnet_notify(peer->ibp_ni,
1789 peer->ibp_nid, 0, last_alive);
1793 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1795 /* This just does the immediate housekeeping. 'error' is zero for a
1796 * normal shutdown which can happen only after the connection has been
1797 * established. If the connection is established, schedule the
1798 * connection to be finished off by the connd. Otherwise the connd is
1799 * already dealing with it (either to set it up or tear it down).
1800 * Caller holds kib_global_lock exclusively in irq context */
1801 unsigned long flags;
1802 kib_peer_t *peer = conn->ibc_peer;
1804 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1806 if (error != 0 && conn->ibc_comms_error == 0)
1807 conn->ibc_comms_error = error;
1809 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1810 return; /* already being handled */
1813 list_empty(&conn->ibc_tx_queue) &&
1814 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1815 list_empty(&conn->ibc_tx_queue_nocred) &&
1816 list_empty(&conn->ibc_active_txs)) {
1817 CDEBUG(D_NET, "closing conn to %s\n",
1818 libcfs_nid2str(peer->ibp_nid));
1820 CDEBUG(D_NETERROR, "Closing conn to %s: error %d%s%s%s%s\n",
1821 libcfs_nid2str(peer->ibp_nid), error,
1822 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1823 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1824 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1825 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1828 list_del(&conn->ibc_list);
1829 /* connd (see below) takes over ibc_list's ref */
1831 if (list_empty (&peer->ibp_conns) && /* no more conns */
1832 kiblnd_peer_active(peer)) { /* still in peer table */
1833 kiblnd_unlink_peer_locked(peer);
1835 /* set/clear error on last conn */
1836 peer->ibp_error = conn->ibc_comms_error;
1839 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1841 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1843 list_add_tail (&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1844 wake_up (&kiblnd_data.kib_connd_waitq);
1846 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1850 kiblnd_close_conn (kib_conn_t *conn, int error)
1852 unsigned long flags;
1854 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1856 kiblnd_close_conn_locked(conn, error);
1858 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1862 kiblnd_handle_early_rxs(kib_conn_t *conn)
1864 unsigned long flags;
1867 LASSERT (!in_interrupt());
1868 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1870 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1871 while (!list_empty(&conn->ibc_early_rxs)) {
1872 rx = list_entry(conn->ibc_early_rxs.next,
1874 list_del(&rx->rx_list);
1875 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1877 kiblnd_handle_rx(rx);
1879 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1881 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1885 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1887 LIST_HEAD (zombies);
1888 struct list_head *tmp;
1889 struct list_head *nxt;
1892 spin_lock(&conn->ibc_lock);
1894 list_for_each_safe (tmp, nxt, txs) {
1895 tx = list_entry (tmp, kib_tx_t, tx_list);
1897 if (txs == &conn->ibc_active_txs) {
1898 LASSERT (!tx->tx_queued);
1899 LASSERT (tx->tx_waiting ||
1900 tx->tx_sending != 0);
1902 LASSERT (tx->tx_queued);
1905 tx->tx_status = -ECONNABORTED;
1908 if (tx->tx_sending == 0) {
1910 list_del (&tx->tx_list);
1911 list_add (&tx->tx_list, &zombies);
1915 spin_unlock(&conn->ibc_lock);
1917 kiblnd_txlist_done(conn->ibc_peer->ibp_ni,
1918 &zombies, -ECONNABORTED);
1922 kiblnd_finalise_conn (kib_conn_t *conn)
1924 LASSERT (!in_interrupt());
1925 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
1927 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
1929 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
1930 * for connections that didn't get as far as being connected, because
1931 * rdma_disconnect() does this for free. */
1932 kiblnd_abort_receives(conn);
1934 /* Complete all tx descs not waiting for sends to complete.
1935 * NB we should be safe from RDMA now that the QP has changed state */
1937 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
1938 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
1939 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
1940 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
1942 kiblnd_handle_early_rxs(conn);
1946 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
1948 LIST_HEAD (zombies);
1949 unsigned long flags;
1951 LASSERT (error != 0);
1952 LASSERT (!in_interrupt());
1954 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1957 LASSERT (peer->ibp_connecting > 0);
1958 peer->ibp_connecting--;
1960 LASSERT (peer->ibp_accepting > 0);
1961 peer->ibp_accepting--;
1964 if (peer->ibp_connecting != 0 ||
1965 peer->ibp_accepting != 0) {
1966 /* another connection attempt under way... */
1967 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1971 if (list_empty(&peer->ibp_conns)) {
1972 /* Take peer's blocked transmits to complete with error */
1973 list_add(&zombies, &peer->ibp_tx_queue);
1974 list_del_init(&peer->ibp_tx_queue);
1976 if (kiblnd_peer_active(peer))
1977 kiblnd_unlink_peer_locked(peer);
1979 peer->ibp_error = error;
1981 /* Can't have blocked transmits if there are connections */
1982 LASSERT (list_empty(&peer->ibp_tx_queue));
1985 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1987 kiblnd_peer_notify(peer);
1989 if (list_empty (&zombies))
1992 CDEBUG (D_NETERROR, "Deleting messages for %s: connection failed\n",
1993 libcfs_nid2str(peer->ibp_nid));
1995 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
1999 kiblnd_connreq_done(kib_conn_t *conn, int status)
2001 kib_peer_t *peer = conn->ibc_peer;
2003 struct list_head txs;
2004 unsigned long flags;
2007 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2009 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2010 libcfs_nid2str(peer->ibp_nid), active,
2011 conn->ibc_version, status);
2013 LASSERT (!in_interrupt());
2014 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2015 peer->ibp_connecting > 0) ||
2016 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2017 peer->ibp_accepting > 0));
2019 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2020 conn->ibc_connvars = NULL;
2023 /* failed to establish connection */
2024 kiblnd_peer_connect_failed(peer, active, status);
2025 kiblnd_finalise_conn(conn);
2029 /* connection established */
2030 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2032 conn->ibc_last_send = jiffies;
2033 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2034 kiblnd_peer_alive(peer);
2036 /* Add conn to peer's list and nuke any dangling conns from a different
2037 * peer instance... */
2038 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2039 list_add(&conn->ibc_list, &peer->ibp_conns);
2041 peer->ibp_connecting--;
2043 peer->ibp_accepting--;
2045 if (peer->ibp_version == 0) {
2046 peer->ibp_version = conn->ibc_version;
2047 peer->ibp_incarnation = conn->ibc_incarnation;
2050 if (peer->ibp_version != conn->ibc_version ||
2051 peer->ibp_incarnation != conn->ibc_incarnation) {
2052 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2053 conn->ibc_incarnation);
2054 peer->ibp_version = conn->ibc_version;
2055 peer->ibp_incarnation = conn->ibc_incarnation;
2058 /* grab pending txs while I have the lock */
2059 list_add(&txs, &peer->ibp_tx_queue);
2060 list_del_init(&peer->ibp_tx_queue);
2062 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2063 conn->ibc_comms_error != 0) { /* error has happened already */
2064 lnet_ni_t *ni = peer->ibp_ni;
2066 /* start to shut down connection */
2067 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2068 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2070 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2075 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2077 /* Schedule blocked txs */
2078 spin_lock (&conn->ibc_lock);
2079 while (!list_empty (&txs)) {
2080 tx = list_entry (txs.next, kib_tx_t, tx_list);
2081 list_del(&tx->tx_list);
2083 kiblnd_queue_tx_locked(tx, conn);
2085 spin_unlock (&conn->ibc_lock);
2087 kiblnd_check_sends(conn);
2089 /* schedule blocked rxs */
2090 kiblnd_handle_early_rxs(conn);
2094 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2098 rc = rdma_reject(cmid, rej, sizeof(*rej));
2101 CWARN("Error %d sending reject\n", rc);
2105 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2107 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2108 kib_msg_t *reqmsg = priv;
2114 lnet_ni_t *ni = NULL;
2115 kib_net_t *net = NULL;
2117 struct rdma_conn_param cp;
2119 int version = IBLND_MSG_VERSION;
2120 unsigned long flags;
2123 LASSERT (!in_interrupt());
2125 /* cmid inherits 'context' from the corresponding listener id */
2126 ibdev = (kib_dev_t *)cmid->context;
2127 LASSERT (ibdev != NULL);
2129 memset(&rej, 0, sizeof(rej));
2130 rej.ibr_magic = IBLND_MSG_MAGIC;
2131 rej.ibr_why = IBLND_REJECT_FATAL;
2132 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2134 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2135 CERROR("Short connection request\n");
2139 /* Future protocol version compatibility support! If the
2140 * o2iblnd-specific protocol changes, or when LNET unifies
2141 * protocols over all LNDs, the initial connection will
2142 * negotiate a protocol version. I trap this here to avoid
2143 * console errors; the reject tells the peer which protocol I
2145 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2146 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2148 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2149 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2150 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2152 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2153 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2154 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2157 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2159 CERROR("Can't parse connection request: %d\n", rc);
2163 nid = reqmsg->ibm_srcnid;
2164 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2167 net = (kib_net_t *)ni->ni_data;
2168 rej.ibr_incarnation = net->ibn_incarnation;
2171 if (ni == NULL || /* no matching net */
2172 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2173 net->ibn_dev != ibdev) { /* wrong device */
2174 CERROR("Can't accept %s: bad dst nid %s\n",
2175 libcfs_nid2str(nid),
2176 libcfs_nid2str(reqmsg->ibm_dstnid));
2181 /* check time stamp as soon as possible */
2182 if (reqmsg->ibm_dststamp != 0 &&
2183 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2184 CWARN("Stale connection request\n");
2185 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2189 /* I can accept peer's version */
2190 version = reqmsg->ibm_version;
2192 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2193 CERROR("Unexpected connreq msg type: %x from %s\n",
2194 reqmsg->ibm_type, libcfs_nid2str(nid));
2198 if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2199 IBLND_MSG_QUEUE_SIZE(version)) {
2200 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2201 libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2202 IBLND_MSG_QUEUE_SIZE(version));
2204 if (version == IBLND_MSG_VERSION)
2205 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2210 if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2211 IBLND_RDMA_FRAGS(version)) {
2212 CERROR("Can't accept %s(version %x): "
2213 "incompatible max_frags %d (%d wanted)\n",
2214 libcfs_nid2str(nid), version,
2215 reqmsg->ibm_u.connparams.ibcp_max_frags,
2216 IBLND_RDMA_FRAGS(version));
2218 if (version == IBLND_MSG_VERSION)
2219 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2225 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2226 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2227 libcfs_nid2str(nid),
2228 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2233 /* assume 'nid' is a new peer; create */
2234 rc = kiblnd_create_peer(ni, &peer, nid);
2236 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2237 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2241 write_lock_irqsave(g_lock, flags);
2243 peer2 = kiblnd_find_peer_locked(nid);
2244 if (peer2 != NULL) {
2245 if (peer2->ibp_version == 0) {
2246 peer2->ibp_version = version;
2247 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2250 /* not the guy I've talked with */
2251 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2252 peer2->ibp_version != version) {
2253 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2254 write_unlock_irqrestore(g_lock, flags);
2256 CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2257 libcfs_nid2str(nid), peer2->ibp_version, version);
2259 kiblnd_peer_decref(peer);
2260 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2264 /* tie-break connection race in favour of the higher NID */
2265 if (peer2->ibp_connecting != 0 &&
2267 write_unlock_irqrestore(g_lock, flags);
2269 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2271 kiblnd_peer_decref(peer);
2272 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2276 peer2->ibp_accepting++;
2277 kiblnd_peer_addref(peer2);
2279 write_unlock_irqrestore(g_lock, flags);
2280 kiblnd_peer_decref(peer);
2283 /* Brand new peer */
2284 LASSERT (peer->ibp_accepting == 0);
2285 LASSERT (peer->ibp_version == 0 &&
2286 peer->ibp_incarnation == 0);
2288 peer->ibp_accepting = 1;
2289 peer->ibp_version = version;
2290 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2292 /* I have a ref on ni that prevents it being shutdown */
2293 LASSERT (net->ibn_shutdown == 0);
2295 kiblnd_peer_addref(peer);
2296 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2298 write_unlock_irqrestore(g_lock, flags);
2301 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2303 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2304 kiblnd_peer_decref(peer);
2305 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2309 /* conn now "owns" cmid, so I return success from here on to ensure the
2310 * CM callback doesn't destroy cmid. */
2312 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2313 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE(version);
2314 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2315 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2316 <= IBLND_RX_MSGS(version));
2318 ackmsg = &conn->ibc_connvars->cv_msg;
2319 memset(ackmsg, 0, sizeof(*ackmsg));
2321 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2322 sizeof(ackmsg->ibm_u.connparams));
2323 ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2324 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2325 ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2327 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2329 memset(&cp, 0, sizeof(cp));
2330 cp.private_data = ackmsg;
2331 cp.private_data_len = ackmsg->ibm_nob;
2332 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2333 cp.initiator_depth = 0;
2334 cp.flow_control = 1;
2335 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2336 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2338 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2340 rc = rdma_accept(cmid, &cp);
2342 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2343 rej.ibr_version = version;
2344 rej.ibr_why = IBLND_REJECT_FATAL;
2346 kiblnd_reject(cmid, &rej);
2347 kiblnd_connreq_done(conn, rc);
2348 kiblnd_conn_decref(conn);
2358 rej.ibr_version = version;
2359 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2360 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2361 kiblnd_reject(cmid, &rej);
2363 return -ECONNREFUSED;
2367 kiblnd_reconnect (kib_conn_t *conn, int version,
2368 __u64 incarnation, int why, kib_connparams_t *cp)
2370 kib_peer_t *peer = conn->ibc_peer;
2373 unsigned long flags;
2375 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2376 LASSERT (peer->ibp_connecting > 0); /* 'conn' at least */
2378 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2380 /* retry connection if it's still needed and no other connection
2381 * attempts (active or passive) are in progress */
2382 if (!list_empty(&peer->ibp_tx_queue) &&
2383 peer->ibp_connecting == 1 &&
2384 peer->ibp_accepting == 0) {
2386 peer->ibp_connecting++;
2388 peer->ibp_version = version;
2389 peer->ibp_incarnation = incarnation;
2392 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2402 case IBLND_REJECT_CONN_STALE:
2406 case IBLND_REJECT_CONN_RACE:
2407 reason = "conn race";
2410 case IBLND_REJECT_CONN_UNCOMPAT:
2411 reason = "version negotiation";
2415 CDEBUG(D_NETERROR, "%s: retrying (%s), %x, %x, "
2416 "queue_dep: %d, max_frag: %d, msg_size: %d\n",
2417 libcfs_nid2str(peer->ibp_nid),
2418 reason, IBLND_MSG_VERSION, version,
2419 cp != NULL ? cp->ibcp_queue_depth : IBLND_MSG_QUEUE_SIZE(version),
2420 cp != NULL ? cp->ibcp_max_frags : IBLND_RDMA_FRAGS(version),
2421 cp != NULL ? cp->ibcp_max_msg_size: IBLND_MSG_SIZE);
2423 kiblnd_connect_peer(peer);
2427 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2429 kib_peer_t *peer = conn->ibc_peer;
2431 LASSERT (!in_interrupt());
2432 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2435 case IB_CM_REJ_STALE_CONN:
2436 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2437 IBLND_REJECT_CONN_STALE, NULL);
2440 case IB_CM_REJ_CONSUMER_DEFINED:
2441 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2442 kib_rej_t *rej = priv;
2443 kib_connparams_t *cp = NULL;
2445 __u64 incarnation = -1;
2447 /* NB. default incarnation is -1 because:
2448 * a) V1 will ignore dst incarnation in connreq.
2449 * b) V2 will provide incarnation while rejecting me,
2450 * -1 will be overwrote.
2452 * if I try to connect to a V1 peer with V2 protocol,
2453 * it rejected me then upgrade to V2, I have no idea
2454 * about the upgrading and try to reconnect with V1,
2455 * in this case upgraded V2 can find out I'm trying to
2456 * talk to the old guy and reject me(incarnation is -1).
2459 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2460 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2461 __swab32s(&rej->ibr_magic);
2462 __swab16s(&rej->ibr_version);
2466 if (priv_nob >= sizeof(kib_rej_t) &&
2467 rej->ibr_version > IBLND_MSG_VERSION_1) {
2468 /* priv_nob is always 148 in current version
2469 * of OFED, so we still need to check version.
2470 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2474 __swab64s(&rej->ibr_incarnation);
2475 __swab16s(&cp->ibcp_queue_depth);
2476 __swab16s(&cp->ibcp_max_frags);
2477 __swab32s(&cp->ibcp_max_msg_size);
2480 incarnation = rej->ibr_incarnation;
2483 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2484 rej->ibr_magic != LNET_PROTO_MAGIC) {
2485 CERROR("%s rejected: consumer defined fatal error\n",
2486 libcfs_nid2str(peer->ibp_nid));
2490 if (rej->ibr_version != IBLND_MSG_VERSION &&
2491 rej->ibr_version != IBLND_MSG_VERSION_1) {
2492 CERROR("%s rejected: o2iblnd version %x error\n",
2493 libcfs_nid2str(peer->ibp_nid),
2498 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2499 rej->ibr_version == IBLND_MSG_VERSION_1) {
2500 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2501 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2503 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2504 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2507 switch (rej->ibr_why) {
2508 case IBLND_REJECT_CONN_RACE:
2509 case IBLND_REJECT_CONN_STALE:
2510 case IBLND_REJECT_CONN_UNCOMPAT:
2511 kiblnd_reconnect(conn, rej->ibr_version,
2512 incarnation, rej->ibr_why, cp);
2515 case IBLND_REJECT_MSG_QUEUE_SIZE:
2516 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2517 libcfs_nid2str(peer->ibp_nid), cp->ibcp_queue_depth,
2518 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2521 case IBLND_REJECT_RDMA_FRAGS:
2522 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2523 libcfs_nid2str(peer->ibp_nid), cp->ibcp_max_frags,
2524 IBLND_RDMA_FRAGS(conn->ibc_version));
2527 case IBLND_REJECT_NO_RESOURCES:
2528 CERROR("%s rejected: o2iblnd no resources\n",
2529 libcfs_nid2str(peer->ibp_nid));
2532 case IBLND_REJECT_FATAL:
2533 CERROR("%s rejected: o2iblnd fatal error\n",
2534 libcfs_nid2str(peer->ibp_nid));
2538 CERROR("%s rejected: o2iblnd reason %d\n",
2539 libcfs_nid2str(peer->ibp_nid),
2547 CDEBUG(D_NETERROR, "%s rejected: reason %d, size %d\n",
2548 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2552 kiblnd_connreq_done(conn, -ECONNREFUSED);
2556 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2558 kib_peer_t *peer = conn->ibc_peer;
2559 lnet_ni_t *ni = peer->ibp_ni;
2560 kib_net_t *net = ni->ni_data;
2561 kib_msg_t *msg = priv;
2562 int ver = conn->ibc_version;
2563 int rc = kiblnd_unpack_msg(msg, priv_nob);
2564 unsigned long flags;
2566 LASSERT (net != NULL);
2569 CERROR("Can't unpack connack from %s: %d\n",
2570 libcfs_nid2str(peer->ibp_nid), rc);
2574 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2575 CERROR("Unexpected message %d from %s\n",
2576 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2581 if (ver != msg->ibm_version) {
2582 CERROR("%s replied version %x is different with "
2583 "requested version %x\n",
2584 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2589 if (msg->ibm_u.connparams.ibcp_queue_depth !=
2590 IBLND_MSG_QUEUE_SIZE(ver)) {
2591 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2592 libcfs_nid2str(peer->ibp_nid),
2593 msg->ibm_u.connparams.ibcp_queue_depth,
2594 IBLND_MSG_QUEUE_SIZE(ver));
2599 if (msg->ibm_u.connparams.ibcp_max_frags !=
2600 IBLND_RDMA_FRAGS(ver)) {
2601 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2602 libcfs_nid2str(peer->ibp_nid),
2603 msg->ibm_u.connparams.ibcp_max_frags,
2604 IBLND_RDMA_FRAGS(ver));
2609 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2610 CERROR("%s max message size %d too big (%d max)\n",
2611 libcfs_nid2str(peer->ibp_nid),
2612 msg->ibm_u.connparams.ibcp_max_msg_size,
2618 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2619 if (msg->ibm_dstnid == ni->ni_nid &&
2620 msg->ibm_dststamp == net->ibn_incarnation)
2624 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2627 CERROR("Bad connection reply from %s, rc = %d, "
2628 "version: %x max_frags: %d\n",
2629 libcfs_nid2str(peer->ibp_nid), rc,
2630 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2634 conn->ibc_incarnation = msg->ibm_srcstamp;
2636 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2637 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2638 <= IBLND_RX_MSGS(ver));
2640 kiblnd_connreq_done(conn, 0);
2644 /* NB My QP has already established itself, so I handle anything going
2645 * wrong here by setting ibc_comms_error.
2646 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2647 * immediately tears it down. */
2650 conn->ibc_comms_error = rc;
2651 kiblnd_connreq_done(conn, 0);
2655 kiblnd_active_connect (struct rdma_cm_id *cmid)
2657 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2660 struct rdma_conn_param cp;
2666 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2668 incarnation = peer->ibp_incarnation;
2669 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION : peer->ibp_version;
2671 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2673 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2675 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2676 kiblnd_peer_decref(peer); /* lose cmid's ref */
2680 /* conn "owns" cmid now, so I return success from here on to ensure the
2681 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2684 msg = &conn->ibc_connvars->cv_msg;
2686 memset(msg, 0, sizeof(*msg));
2687 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2688 msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2689 msg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2690 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2692 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2693 0, peer->ibp_nid, incarnation);
2695 memset(&cp, 0, sizeof(cp));
2696 cp.private_data = msg;
2697 cp.private_data_len = msg->ibm_nob;
2698 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2699 cp.initiator_depth = 0;
2700 cp.flow_control = 1;
2701 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2702 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2704 LASSERT(cmid->context == (void *)conn);
2705 LASSERT(conn->ibc_cmid == cmid);
2707 rc = rdma_connect(cmid, &cp);
2709 CERROR("Can't connect to %s: %d\n",
2710 libcfs_nid2str(peer->ibp_nid), rc);
2711 kiblnd_connreq_done(conn, rc);
2712 kiblnd_conn_decref(conn);
2719 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2725 switch (event->event) {
2729 case RDMA_CM_EVENT_CONNECT_REQUEST:
2730 /* destroy cmid on failure */
2731 rc = kiblnd_passive_connect(cmid,
2732 (void *)KIBLND_CONN_PARAM(event),
2733 KIBLND_CONN_PARAM_LEN(event));
2734 CDEBUG(D_NET, "connreq: %d\n", rc);
2737 case RDMA_CM_EVENT_ADDR_ERROR:
2738 peer = (kib_peer_t *)cmid->context;
2739 CDEBUG(D_NETERROR, "%s: ADDR ERROR %d\n",
2740 libcfs_nid2str(peer->ibp_nid), event->status);
2741 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2742 kiblnd_peer_decref(peer);
2743 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2745 case RDMA_CM_EVENT_ADDR_RESOLVED:
2746 peer = (kib_peer_t *)cmid->context;
2748 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2749 libcfs_nid2str(peer->ibp_nid), event->status);
2751 if (event->status != 0) {
2752 CDEBUG(D_NETERROR, "Can't resolve address for %s: %d\n",
2753 libcfs_nid2str(peer->ibp_nid), event->status);
2756 rc = rdma_resolve_route(
2757 cmid, *kiblnd_tunables.kib_timeout * 1000);
2760 /* Can't initiate route resolution */
2761 CERROR("Can't resolve route for %s: %d\n",
2762 libcfs_nid2str(peer->ibp_nid), rc);
2764 kiblnd_peer_connect_failed(peer, 1, rc);
2765 kiblnd_peer_decref(peer);
2766 return rc; /* rc != 0 destroys cmid */
2768 case RDMA_CM_EVENT_ROUTE_ERROR:
2769 peer = (kib_peer_t *)cmid->context;
2770 CDEBUG(D_NETERROR, "%s: ROUTE ERROR %d\n",
2771 libcfs_nid2str(peer->ibp_nid), event->status);
2772 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2773 kiblnd_peer_decref(peer);
2774 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2776 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2777 peer = (kib_peer_t *)cmid->context;
2778 CDEBUG(D_NET,"%s Route resolved: %d\n",
2779 libcfs_nid2str(peer->ibp_nid), event->status);
2781 if (event->status == 0)
2782 return kiblnd_active_connect(cmid);
2784 CDEBUG(D_NETERROR, "Can't resolve route for %s: %d\n",
2785 libcfs_nid2str(peer->ibp_nid), event->status);
2786 kiblnd_peer_connect_failed(peer, 1, event->status);
2787 kiblnd_peer_decref(peer);
2788 return event->status; /* rc != 0 destroys cmid */
2790 case RDMA_CM_EVENT_UNREACHABLE:
2791 conn = (kib_conn_t *)cmid->context;
2792 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2793 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2794 CDEBUG(D_NETERROR, "%s: UNREACHABLE %d\n",
2795 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2796 kiblnd_connreq_done(conn, -ENETDOWN);
2797 kiblnd_conn_decref(conn);
2800 case RDMA_CM_EVENT_CONNECT_ERROR:
2801 conn = (kib_conn_t *)cmid->context;
2802 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2803 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2804 CDEBUG(D_NETERROR, "%s: CONNECT ERROR %d\n",
2805 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2806 kiblnd_connreq_done(conn, -ENOTCONN);
2807 kiblnd_conn_decref(conn);
2810 case RDMA_CM_EVENT_REJECTED:
2811 conn = (kib_conn_t *)cmid->context;
2812 switch (conn->ibc_state) {
2816 case IBLND_CONN_PASSIVE_WAIT:
2817 CERROR ("%s: REJECTED %d\n",
2818 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2820 kiblnd_connreq_done(conn, -ECONNRESET);
2823 case IBLND_CONN_ACTIVE_CONNECT:
2824 kiblnd_rejected(conn, event->status,
2825 (void *)KIBLND_CONN_PARAM(event),
2826 KIBLND_CONN_PARAM_LEN(event));
2829 kiblnd_conn_decref(conn);
2832 case RDMA_CM_EVENT_ESTABLISHED:
2833 conn = (kib_conn_t *)cmid->context;
2834 switch (conn->ibc_state) {
2838 case IBLND_CONN_PASSIVE_WAIT:
2839 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2840 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2841 kiblnd_connreq_done(conn, 0);
2844 case IBLND_CONN_ACTIVE_CONNECT:
2845 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2846 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2847 kiblnd_check_connreply(conn,
2848 (void *)KIBLND_CONN_PARAM(event),
2849 KIBLND_CONN_PARAM_LEN(event));
2852 /* net keeps its ref on conn! */
2855 case RDMA_CM_EVENT_DISCONNECTED:
2856 conn = (kib_conn_t *)cmid->context;
2857 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2858 CERROR("%s DISCONNECTED\n",
2859 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2860 kiblnd_connreq_done(conn, -ECONNRESET);
2862 kiblnd_close_conn(conn, 0);
2864 kiblnd_conn_decref(conn);
2867 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2868 LCONSOLE_ERROR_MSG(0x131,
2869 "Received notification of device removal\n"
2870 "Please shutdown LNET to allow this to proceed\n");
2871 /* Can't remove network from underneath LNET for now, so I have
2878 kiblnd_check_txs (kib_conn_t *conn, struct list_head *txs)
2881 struct list_head *ttmp;
2884 spin_lock(&conn->ibc_lock);
2886 list_for_each (ttmp, txs) {
2887 tx = list_entry (ttmp, kib_tx_t, tx_list);
2889 if (txs != &conn->ibc_active_txs) {
2890 LASSERT (tx->tx_queued);
2892 LASSERT (!tx->tx_queued);
2893 LASSERT (tx->tx_waiting || tx->tx_sending != 0);
2896 if (time_after_eq (jiffies, tx->tx_deadline)) {
2898 CERROR("Timed out tx: %s, %lu seconds\n",
2899 kiblnd_queue2str(conn, txs),
2900 cfs_duration_sec(jiffies - tx->tx_deadline));
2905 spin_unlock(&conn->ibc_lock);
2910 kiblnd_conn_timed_out (kib_conn_t *conn)
2912 return kiblnd_check_txs(conn, &conn->ibc_tx_queue) ||
2913 kiblnd_check_txs(conn, &conn->ibc_tx_queue_rsrvd) ||
2914 kiblnd_check_txs(conn, &conn->ibc_tx_queue_nocred) ||
2915 kiblnd_check_txs(conn, &conn->ibc_active_txs);
2919 kiblnd_check_conns (int idx)
2921 struct list_head *peers = &kiblnd_data.kib_peers[idx];
2922 struct list_head *ptmp;
2925 struct list_head *ctmp;
2926 unsigned long flags;
2929 /* NB. We expect to have a look at all the peers and not find any
2930 * rdmas to time out, so we just use a shared lock while we
2932 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2934 list_for_each (ptmp, peers) {
2935 peer = list_entry (ptmp, kib_peer_t, ibp_list);
2937 list_for_each (ctmp, &peer->ibp_conns) {
2938 conn = list_entry (ctmp, kib_conn_t, ibc_list);
2940 LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
2942 /* In case we have enough credits to return via a
2943 * NOOP, but there were no non-blocking tx descs
2944 * free to do it last time... */
2945 kiblnd_check_sends(conn);
2947 if (!kiblnd_conn_timed_out(conn))
2950 /* Handle timeout by closing the whole connection. We
2951 * can only be sure RDMA activity has ceased once the
2952 * QP has been modified. */
2954 kiblnd_conn_addref(conn); /* 1 ref for me... */
2956 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2959 CERROR("Timed out RDMA with %s (%lu)\n",
2960 libcfs_nid2str(peer->ibp_nid),
2961 cfs_duration_sec(cfs_time_current() -
2962 peer->ibp_last_alive));
2964 kiblnd_close_conn(conn, -ETIMEDOUT);
2965 kiblnd_conn_decref(conn); /* ...until here */
2967 /* start again now I've dropped the lock */
2972 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2976 kiblnd_disconnect_conn (kib_conn_t *conn)
2978 LASSERT (!in_interrupt());
2979 LASSERT (current == kiblnd_data.kib_connd);
2980 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
2982 rdma_disconnect(conn->ibc_cmid);
2983 kiblnd_finalise_conn(conn);
2985 kiblnd_peer_notify(conn->ibc_peer);
2989 kiblnd_connd (void *arg)
2992 unsigned long flags;
2998 unsigned long deadline = jiffies;
3000 cfs_daemonize ("kiblnd_connd");
3001 cfs_block_allsigs ();
3003 init_waitqueue_entry (&wait, current);
3004 kiblnd_data.kib_connd = current;
3006 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3008 while (!kiblnd_data.kib_shutdown) {
3012 if (!list_empty (&kiblnd_data.kib_connd_zombies)) {
3013 conn = list_entry (kiblnd_data.kib_connd_zombies.next,
3014 kib_conn_t, ibc_list);
3015 list_del(&conn->ibc_list);
3017 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3020 kiblnd_destroy_conn(conn);
3022 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3025 if (!list_empty (&kiblnd_data.kib_connd_conns)) {
3026 conn = list_entry (kiblnd_data.kib_connd_conns.next,
3027 kib_conn_t, ibc_list);
3028 list_del(&conn->ibc_list);
3030 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3033 kiblnd_disconnect_conn(conn);
3034 kiblnd_conn_decref(conn);
3036 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3039 /* careful with the jiffy wrap... */
3040 timeout = (int)(deadline - jiffies);
3044 int chunk = kiblnd_data.kib_peer_hash_size;
3046 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3049 /* Time to check for RDMA timeouts on a few more
3050 * peers: I do checks every 'p' seconds on a
3051 * proportion of the peer table and I need to check
3052 * every connection 'n' times within a timeout
3053 * interval, to ensure I detect a timeout on any
3054 * connection within (n+1)/n times the timeout
3057 if (*kiblnd_tunables.kib_timeout > n * p)
3058 chunk = (chunk * n * p) /
3059 *kiblnd_tunables.kib_timeout;
3063 for (i = 0; i < chunk; i++) {
3064 kiblnd_check_conns(peer_index);
3065 peer_index = (peer_index + 1) %
3066 kiblnd_data.kib_peer_hash_size;
3070 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3076 /* Nothing to do for 'timeout' */
3077 set_current_state (TASK_INTERRUPTIBLE);
3078 add_wait_queue (&kiblnd_data.kib_connd_waitq, &wait);
3079 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3081 schedule_timeout (timeout);
3083 set_current_state (TASK_RUNNING);
3084 remove_wait_queue (&kiblnd_data.kib_connd_waitq, &wait);
3085 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3088 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3090 kiblnd_thread_fini();
3095 kiblnd_qp_event(struct ib_event *event, void *arg)
3097 kib_conn_t *conn = arg;
3099 switch (event->event) {
3100 case IB_EVENT_COMM_EST:
3101 CDEBUG(D_NET, "%s established\n",
3102 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3106 CERROR("%s: Async QP event type %d\n",
3107 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3113 kiblnd_complete (struct ib_wc *wc)
3115 switch (kiblnd_wreqid2type(wc->wr_id)) {
3119 case IBLND_WID_RDMA:
3120 /* We only get RDMA completion notification if it fails. All
3121 * subsequent work items, including the final SEND will fail
3122 * too. However we can't print out any more info about the
3123 * failing RDMA because 'tx' might be back on the idle list or
3124 * even reused already if we didn't manage to post all our work
3126 CDEBUG(D_NETERROR, "RDMA (tx: %p) failed: %d\n",
3127 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3131 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3135 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3142 kiblnd_cq_completion (struct ib_cq *cq, void *arg)
3144 /* NB I'm not allowed to schedule this conn once its refcount has
3145 * reached 0. Since fundamentally I'm racing with scheduler threads
3146 * consuming my CQ I could be called after all completions have
3147 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3148 * and this CQ is about to be destroyed so I NOOP. */
3149 kib_conn_t *conn = (kib_conn_t *)arg;
3150 unsigned long flags;
3152 LASSERT (cq == conn->ibc_cq);
3154 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3156 conn->ibc_ready = 1;
3158 if (!conn->ibc_scheduled &&
3159 (conn->ibc_nrx > 0 ||
3160 conn->ibc_nsends_posted > 0)) {
3161 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3162 conn->ibc_scheduled = 1;
3163 list_add_tail(&conn->ibc_sched_list,
3164 &kiblnd_data.kib_sched_conns);
3165 wake_up(&kiblnd_data.kib_sched_waitq);
3168 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3172 kiblnd_cq_event(struct ib_event *event, void *arg)
3174 kib_conn_t *conn = arg;
3176 CERROR("%s: async CQ event type %d\n",
3177 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3181 kiblnd_scheduler(void *arg)
3183 long id = (long)arg;
3186 unsigned long flags;
3193 snprintf(name, sizeof(name), "kiblnd_sd_%02ld", id);
3194 cfs_daemonize(name);
3195 cfs_block_allsigs();
3197 init_waitqueue_entry(&wait, current);
3199 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3201 while (!kiblnd_data.kib_shutdown) {
3202 if (busy_loops++ >= IBLND_RESCHED) {
3203 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3209 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3214 if (!list_empty(&kiblnd_data.kib_sched_conns)) {
3215 conn = list_entry(kiblnd_data.kib_sched_conns.next,
3216 kib_conn_t, ibc_sched_list);
3217 /* take over kib_sched_conns' ref on conn... */
3218 LASSERT(conn->ibc_scheduled);
3219 list_del(&conn->ibc_sched_list);
3220 conn->ibc_ready = 0;
3222 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3225 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3227 rc = ib_req_notify_cq(conn->ibc_cq,
3230 CWARN("%s: ib_req_notify_cq failed: %d, "
3231 "closing connection\n",
3232 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3233 kiblnd_close_conn(conn, -EIO);
3234 kiblnd_conn_decref(conn);
3235 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3239 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3243 CWARN("%s: ib_poll_cq failed: %d, "
3244 "closing connection\n",
3245 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3246 kiblnd_close_conn(conn, -EIO);
3247 kiblnd_conn_decref(conn);
3248 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3252 spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
3255 if (rc != 0 || conn->ibc_ready) {
3256 /* There may be another completion waiting; get
3257 * another scheduler to check while I handle
3259 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3260 list_add_tail(&conn->ibc_sched_list,
3261 &kiblnd_data.kib_sched_conns);
3262 wake_up(&kiblnd_data.kib_sched_waitq);
3264 conn->ibc_scheduled = 0;
3268 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3271 kiblnd_complete(&wc);
3273 spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
3277 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3284 set_current_state(TASK_INTERRUPTIBLE);
3285 add_wait_queue_exclusive(&kiblnd_data.kib_sched_waitq, &wait);
3286 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3291 remove_wait_queue(&kiblnd_data.kib_sched_waitq, &wait);
3292 set_current_state(TASK_RUNNING);
3293 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3296 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3298 kiblnd_thread_fini();