1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
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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_msgtype2str(int type)
47 case IBLND_MSG_CONNREQ:
50 case IBLND_MSG_CONNACK:
56 case IBLND_MSG_IMMEDIATE:
59 case IBLND_MSG_PUT_REQ:
62 case IBLND_MSG_PUT_NAK:
65 case IBLND_MSG_PUT_ACK:
68 case IBLND_MSG_PUT_DONE:
71 case IBLND_MSG_GET_REQ:
74 case IBLND_MSG_GET_DONE:
83 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
85 lnet_msg_t *lntmsg[2];
86 kib_net_t *net = ni->ni_data;
90 LASSERT (net != NULL);
91 LASSERT (!in_interrupt());
92 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
93 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
94 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer response */
96 #if IBLND_MAP_ON_DEMAND
97 if (tx->tx_fmr != NULL) {
98 rc = ib_fmr_pool_unmap(tx->tx_fmr);
101 if (tx->tx_status != 0) {
102 rc = ib_flush_fmr_pool(net->ibn_fmrpool);
109 if (tx->tx_nfrags != 0) {
110 kiblnd_dma_unmap_sg(net->ibn_dev->ibd_cmid->device,
111 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
115 /* tx may have up to 2 lnet msgs to finalise */
116 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
117 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
120 if (tx->tx_conn != NULL) {
121 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
123 kiblnd_conn_decref(tx->tx_conn);
130 spin_lock(&net->ibn_tx_lock);
132 list_add(&tx->tx_list, &net->ibn_idle_txs);
134 spin_unlock(&net->ibn_tx_lock);
136 /* delay finalize until my descs have been freed */
137 for (i = 0; i < 2; i++) {
138 if (lntmsg[i] == NULL)
141 lnet_finalize(ni, lntmsg[i], rc);
146 kiblnd_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int status)
150 while (!list_empty (txlist)) {
151 tx = list_entry (txlist->next, kib_tx_t, tx_list);
153 list_del (&tx->tx_list);
156 tx->tx_status = status;
157 kiblnd_tx_done(ni, tx);
162 kiblnd_get_idle_tx (lnet_ni_t *ni)
164 kib_net_t *net = ni->ni_data;
167 LASSERT (net != NULL);
169 spin_lock(&net->ibn_tx_lock);
171 if (list_empty(&net->ibn_idle_txs)) {
172 spin_unlock(&net->ibn_tx_lock);
176 tx = list_entry(net->ibn_idle_txs.next, kib_tx_t, tx_list);
177 list_del(&tx->tx_list);
179 /* Allocate a new completion cookie. It might not be needed,
180 * but we've got a lock right now and we're unlikely to
182 tx->tx_cookie = kiblnd_data.kib_next_tx_cookie++;
184 spin_unlock(&net->ibn_tx_lock);
186 LASSERT (tx->tx_nwrq == 0);
187 LASSERT (!tx->tx_queued);
188 LASSERT (tx->tx_sending == 0);
189 LASSERT (!tx->tx_waiting);
190 LASSERT (tx->tx_status == 0);
191 LASSERT (tx->tx_conn == NULL);
192 LASSERT (tx->tx_lntmsg[0] == NULL);
193 LASSERT (tx->tx_lntmsg[1] == NULL);
194 #if IBLND_MAP_ON_DEMAND
195 LASSERT (tx->tx_fmr == NULL);
197 LASSERT (tx->tx_nfrags == 0);
204 kiblnd_drop_rx (kib_rx_t *rx)
206 kib_conn_t *conn = rx->rx_conn;
209 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
210 LASSERT (conn->ibc_nrx > 0);
212 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
214 kiblnd_conn_decref(conn);
218 kiblnd_post_rx (kib_rx_t *rx, int credit)
220 kib_conn_t *conn = rx->rx_conn;
221 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
222 struct ib_recv_wr *bad_wrq;
225 LASSERT (net != NULL);
226 LASSERT (!in_interrupt());
227 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
228 credit == IBLND_POSTRX_PEER_CREDIT ||
229 credit == IBLND_POSTRX_RSRVD_CREDIT);
231 rx->rx_sge.length = IBLND_MSG_SIZE;
232 rx->rx_sge.lkey = net->ibn_dev->ibd_mr->lkey;
233 rx->rx_sge.addr = rx->rx_msgaddr;
235 rx->rx_wrq.next = NULL;
236 rx->rx_wrq.sg_list = &rx->rx_sge;
237 rx->rx_wrq.num_sge = 1;
238 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
240 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
241 LASSERT (rx->rx_nob >= 0); /* not posted */
243 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
244 kiblnd_drop_rx(rx); /* No more posts for this rx */
248 rx->rx_nob = -1; /* flag posted */
250 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
252 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
256 CERROR("Can't post rx for %s: %d\n",
257 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
258 kiblnd_close_conn(conn, rc);
259 kiblnd_drop_rx(rx); /* No more posts for this rx */
263 if (credit == IBLND_POSTRX_NO_CREDIT)
266 spin_lock(&conn->ibc_lock);
267 if (credit == IBLND_POSTRX_PEER_CREDIT)
268 conn->ibc_outstanding_credits++;
270 conn->ibc_reserved_credits++;
271 spin_unlock(&conn->ibc_lock);
273 kiblnd_check_sends(conn);
278 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
280 struct list_head *tmp;
282 list_for_each(tmp, &conn->ibc_active_txs) {
283 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
285 LASSERT (!tx->tx_queued);
286 LASSERT (tx->tx_sending != 0 || tx->tx_waiting);
288 if (tx->tx_cookie != cookie)
291 if (tx->tx_waiting &&
292 tx->tx_msg->ibm_type == txtype)
295 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
296 tx->tx_waiting ? "" : "NOT ",
297 tx->tx_msg->ibm_type, txtype);
303 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
306 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
309 spin_lock(&conn->ibc_lock);
311 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
313 spin_unlock(&conn->ibc_lock);
315 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
316 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
317 kiblnd_close_conn(conn, -EPROTO);
321 if (tx->tx_status == 0) { /* success so far */
322 if (status < 0) { /* failed? */
323 tx->tx_status = status;
324 } else if (txtype == IBLND_MSG_GET_REQ) {
325 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
331 idle = !tx->tx_queued && (tx->tx_sending == 0);
333 list_del(&tx->tx_list);
335 spin_unlock(&conn->ibc_lock);
338 kiblnd_tx_done(ni, tx);
342 kiblnd_send_completion (kib_conn_t *conn, int type, int status, __u64 cookie)
344 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
345 kib_tx_t *tx = kiblnd_get_idle_tx(ni);
348 CERROR("Can't get tx for completion %x for %s\n",
349 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
353 tx->tx_msg->ibm_u.completion.ibcm_status = status;
354 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
355 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
357 kiblnd_queue_tx(tx, conn);
361 kiblnd_handle_rx (kib_rx_t *rx)
363 kib_msg_t *msg = rx->rx_msg;
364 kib_conn_t *conn = rx->rx_conn;
365 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
366 int credits = msg->ibm_credits;
372 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
374 CDEBUG (D_NET, "Received %x[%d] from %s\n",
375 msg->ibm_type, credits, libcfs_nid2str(conn->ibc_peer->ibp_nid));
378 /* Have I received credits that will let me send? */
379 spin_lock(&conn->ibc_lock);
381 if (conn->ibc_credits + credits > IBLND_MSG_QUEUE_SIZE) {
382 rc2 = conn->ibc_credits;
383 spin_unlock(&conn->ibc_lock);
385 CERROR("Bad credits from %s: %d + %d > %d\n",
386 libcfs_nid2str(conn->ibc_peer->ibp_nid),
387 rc2, credits, IBLND_MSG_QUEUE_SIZE);
389 kiblnd_close_conn(conn, -EPROTO);
390 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
394 conn->ibc_credits += credits;
396 /* This ensures the credit taken by NOOP can be returned */
397 if (msg->ibm_type == IBLND_MSG_NOOP)
398 conn->ibc_outstanding_credits++;
400 spin_unlock(&conn->ibc_lock);
401 kiblnd_check_sends(conn);
404 switch (msg->ibm_type) {
406 CERROR("Bad IBLND message type %x from %s\n",
407 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
408 post_credit = IBLND_POSTRX_NO_CREDIT;
413 if (credits != 0) /* credit already posted */
414 post_credit = IBLND_POSTRX_NO_CREDIT;
415 else /* a keepalive NOOP */
416 post_credit = IBLND_POSTRX_PEER_CREDIT;
419 case IBLND_MSG_IMMEDIATE:
420 post_credit = IBLND_POSTRX_DONT_POST;
421 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
422 msg->ibm_srcnid, rx, 0);
423 if (rc < 0) /* repost on error */
424 post_credit = IBLND_POSTRX_PEER_CREDIT;
427 case IBLND_MSG_PUT_REQ:
428 post_credit = IBLND_POSTRX_DONT_POST;
429 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
430 msg->ibm_srcnid, rx, 1);
431 if (rc < 0) /* repost on error */
432 post_credit = IBLND_POSTRX_PEER_CREDIT;
435 case IBLND_MSG_PUT_NAK:
436 CWARN ("PUT_NACK from %s\n", libcfs_nid2str(conn->ibc_peer->ibp_nid));
437 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
438 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
439 msg->ibm_u.completion.ibcm_status,
440 msg->ibm_u.completion.ibcm_cookie);
443 case IBLND_MSG_PUT_ACK:
444 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
446 spin_lock(&conn->ibc_lock);
447 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
448 msg->ibm_u.putack.ibpam_src_cookie);
450 list_del(&tx->tx_list);
451 spin_unlock(&conn->ibc_lock);
454 CERROR("Unmatched PUT_ACK from %s\n",
455 libcfs_nid2str(conn->ibc_peer->ibp_nid));
460 LASSERT (tx->tx_waiting);
461 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
462 * (a) I can overwrite tx_msg since my peer has received it!
463 * (b) tx_waiting set tells tx_complete() it's not done. */
465 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
467 rc2 = kiblnd_init_rdma(ni, tx, IBLND_MSG_PUT_DONE,
468 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
469 &msg->ibm_u.putack.ibpam_rd,
470 msg->ibm_u.putack.ibpam_dst_cookie);
472 CERROR("Can't setup rdma for PUT to %s: %d\n",
473 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
475 spin_lock(&conn->ibc_lock);
476 tx->tx_waiting = 0; /* clear waiting and queue atomically */
477 kiblnd_queue_tx_locked(tx, conn);
478 spin_unlock(&conn->ibc_lock);
481 case IBLND_MSG_PUT_DONE:
482 post_credit = IBLND_POSTRX_PEER_CREDIT;
483 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
484 msg->ibm_u.completion.ibcm_status,
485 msg->ibm_u.completion.ibcm_cookie);
488 case IBLND_MSG_GET_REQ:
489 post_credit = IBLND_POSTRX_DONT_POST;
490 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
491 msg->ibm_srcnid, rx, 1);
492 if (rc < 0) /* repost on error */
493 post_credit = IBLND_POSTRX_PEER_CREDIT;
496 case IBLND_MSG_GET_DONE:
497 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
498 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
499 msg->ibm_u.completion.ibcm_status,
500 msg->ibm_u.completion.ibcm_cookie);
504 if (rc < 0) /* protocol error */
505 kiblnd_close_conn(conn, rc);
507 if (post_credit != IBLND_POSTRX_DONT_POST)
508 kiblnd_post_rx(rx, post_credit);
512 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
514 kib_msg_t *msg = rx->rx_msg;
515 kib_conn_t *conn = rx->rx_conn;
516 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
517 kib_net_t *net = ni->ni_data;
522 LASSERT (net != NULL);
523 LASSERT (rx->rx_nob < 0); /* was posted */
524 rx->rx_nob = 0; /* isn't now */
526 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
529 if (status != IB_WC_SUCCESS) {
530 CDEBUG(D_NETERROR, "Rx from %s failed: %d\n",
531 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
538 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
540 CERROR ("Error %d unpacking rx from %s\n",
541 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
545 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
546 msg->ibm_dstnid != ni->ni_nid ||
547 msg->ibm_srcstamp != conn->ibc_incarnation ||
548 msg->ibm_dststamp != net->ibn_incarnation) {
549 CERROR ("Stale rx from %s\n",
550 libcfs_nid2str(conn->ibc_peer->ibp_nid));
555 /* set time last known alive */
556 kiblnd_peer_alive(conn->ibc_peer);
558 /* racing with connection establishment/teardown! */
560 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
561 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
562 /* must check holding global lock to eliminate race */
563 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
564 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
565 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
569 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
572 kiblnd_handle_rx(rx);
576 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
577 kiblnd_close_conn(conn, err);
579 kiblnd_drop_rx(rx); /* Don't re-post rx. */
583 kiblnd_kvaddr_to_page (unsigned long vaddr)
587 if (vaddr >= VMALLOC_START &&
588 vaddr < VMALLOC_END) {
589 page = vmalloc_to_page ((void *)vaddr);
590 LASSERT (page != NULL);
593 #ifdef CONFIG_HIGHMEM
594 if (vaddr >= PKMAP_BASE &&
595 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
596 /* No highmem pages only used for bulk (kiov) I/O */
597 CERROR("find page for address in highmem\n");
601 page = virt_to_page (vaddr);
602 LASSERT (page != NULL);
606 #if !IBLND_MAP_ON_DEMAND
608 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
609 unsigned int niov, struct iovec *iov, int offset, int nob)
612 struct scatterlist *sg;
618 kib_net_t *net = ni->ni_data;
622 LASSERT (net != NULL);
624 while (offset >= iov->iov_len) {
625 offset -= iov->iov_len;
635 vaddr = ((unsigned long)iov->iov_base) + offset;
636 page_offset = vaddr & (PAGE_SIZE - 1);
637 page = kiblnd_kvaddr_to_page(vaddr);
639 CERROR ("Can't find page\n");
643 fragnob = min((int)(iov->iov_len - offset), nob);
644 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
647 sg->offset = page_offset;
648 sg->length = fragnob;
651 if (offset + fragnob < iov->iov_len) {
661 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
663 tx->tx_nfrags = sg - tx->tx_frags;
664 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
666 rd->rd_nfrags = kiblnd_dma_map_sg(net->ibn_dev->ibd_cmid->device,
667 tx->tx_frags, tx->tx_nfrags,
669 rd->rd_key = (rd != tx->tx_rd) ?
670 net->ibn_dev->ibd_mr->rkey : net->ibn_dev->ibd_mr->lkey;
672 for (i = 0; i < rd->rd_nfrags; i++) {
673 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
674 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
675 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
676 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
683 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
684 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
686 struct scatterlist *sg;
689 kib_net_t *net = ni->ni_data;
691 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
695 LASSERT (net != NULL);
697 while (offset >= kiov->kiov_len) {
698 offset -= kiov->kiov_len;
708 fragnob = min((int)(kiov->kiov_len - offset), nob);
710 memset(sg, 0, sizeof(*sg));
711 sg->page = kiov->kiov_page;
712 sg->offset = kiov->kiov_offset + offset;
713 sg->length = fragnob;
722 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
724 tx->tx_nfrags = sg - tx->tx_frags;
725 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
727 rd->rd_nfrags = kiblnd_dma_map_sg(net->ibn_dev->ibd_cmid->device,
728 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
729 rd->rd_key = (rd != tx->tx_rd) ?
730 net->ibn_dev->ibd_mr->rkey : net->ibn_dev->ibd_mr->lkey;
732 for (i = 0; i < tx->tx_nfrags; i++) {
733 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
734 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
735 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
736 net->ibn_dev->ibd_cmid->device, &tx->tx_frags[i]);
738 CDEBUG(D_WARNING,"frag[%d]: "LPX64" for %d\n",
739 i, rd->rd_frags[i].rf_addr, rd->rd_frags[i].rf_nob);
747 kiblnd_map_tx (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
748 int npages, unsigned long page_offset, int nob)
750 struct ib_pool_fmr *fmr;
751 kib_net_t *net = ni->ni_data;
753 LASSERT (net != NULL);
754 LASSERT (tx->tx_fmr == NULL);
755 LASSERT (page_offset < PAGE_SIZE);
756 LASSERT (npages >= (1 + ((page_offset + nob - 1)>>PAGE_SHIFT)));
757 LASSERT (npages <= LNET_MAX_IOV);
761 fmr = ib_fmr_pool_map_phys(net->ibn_fmrpool, tx->tx_pages,
762 npages, rd->rd_addr);
764 CERROR ("Can't map %d pages: %ld\n", npages, PTR_ERR(fmr));
768 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
771 rd->rd_key = (rd != tx->tx_rd) ? fmr->fmr->rkey : fmr->fmr->lkey;
779 kiblnd_setup_rd_iov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
780 unsigned int niov, struct iovec *iov, int offset, int nob)
787 unsigned long page_offset;
793 while (offset >= iov->iov_len) {
794 offset -= iov->iov_len;
800 if (nob > iov->iov_len - offset) {
801 CERROR ("Can't map multiple vaddr fragments\n");
805 vaddr = ((unsigned long)iov->iov_base) + offset;
807 page_offset = vaddr & (PAGE_SIZE - 1);
812 LASSERT (npages < LNET_MAX_IOV);
814 page = kiblnd_kvaddr_to_page(vaddr);
816 CERROR("Can't find page for %lu\n", vaddr);
820 tx->tx_pages[npages++] = lnet_page2phys(page);
822 fragnob = PAGE_SIZE - (vaddr & (PAGE_SIZE - 1));
828 return kiblnd_map_tx(ni, tx, rd, npages, page_offset, nob);
832 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
833 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
837 unsigned long page_offset;
839 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
843 LASSERT (nkiov <= LNET_MAX_IOV);
845 while (offset >= kiov->kiov_len) {
846 offset -= kiov->kiov_len;
852 page_offset = kiov->kiov_offset + offset;
854 resid = offset + nob;
858 LASSERT (npages < LNET_MAX_IOV);
861 if ((npages > 0 && kiov->kiov_offset != 0) ||
862 (resid > kiov->kiov_len &&
863 (kiov->kiov_offset + kiov->kiov_len) != PAGE_SIZE)) {
864 /* Can't have gaps */
865 CERROR ("Can't make payload contiguous in I/O VM:"
866 "page %d, offset %d, len %d \n",
867 npages, kiov->kiov_offset, kiov->kiov_len);
872 tx->tx_pages[npages++] = lnet_page2phys(kiov->kiov_page);
873 resid -= kiov->kiov_len;
878 return kiblnd_map_tx(ni, tx, rd, npages, page_offset, nob);
883 kiblnd_check_sends (kib_conn_t *conn)
886 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
888 int consume_cred = 0;
889 struct ib_send_wr *bad_wrq;
892 /* Don't send anything until after the connection is established */
893 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
894 CDEBUG(D_NET, "%s too soon\n",
895 libcfs_nid2str(conn->ibc_peer->ibp_nid));
899 spin_lock(&conn->ibc_lock);
901 LASSERT (conn->ibc_nsends_posted <=
902 *kiblnd_tunables.kib_concurrent_sends);
903 LASSERT (conn->ibc_reserved_credits >= 0);
905 while (conn->ibc_reserved_credits > 0 &&
906 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
907 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
909 list_del(&tx->tx_list);
910 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
911 conn->ibc_reserved_credits--;
914 if (kiblnd_send_noop(conn)) {
915 spin_unlock(&conn->ibc_lock);
917 tx = kiblnd_get_idle_tx(ni);
919 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
921 spin_lock(&conn->ibc_lock);
924 kiblnd_queue_tx_locked(tx, conn);
928 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
929 tx = list_entry(conn->ibc_tx_queue_nocred.next,
932 } else if (!list_empty(&conn->ibc_tx_noops)) {
933 tx = list_entry(conn->ibc_tx_noops.next,
936 } else if (!list_empty(&conn->ibc_tx_queue)) {
937 tx = list_entry(conn->ibc_tx_queue.next,
941 /* nothing to send right now */
945 LASSERT (tx->tx_queued);
946 /* We rely on this for QP sizing */
947 LASSERT (tx->tx_nwrq > 0 &&
948 tx->tx_nwrq <= 1 + IBLND_MAX_RDMA_FRAGS);
950 LASSERT (conn->ibc_outstanding_credits >= 0);
951 LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE);
952 LASSERT (conn->ibc_credits >= 0);
953 LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE);
955 if (conn->ibc_nsends_posted ==
956 *kiblnd_tunables.kib_concurrent_sends) {
957 /* tx completions outstanding... */
958 CDEBUG(D_NET, "%s: posted enough\n",
959 libcfs_nid2str(conn->ibc_peer->ibp_nid));
964 if (conn->ibc_credits == 0) { /* no credits */
965 CDEBUG(D_NET, "%s: no credits\n",
966 libcfs_nid2str(conn->ibc_peer->ibp_nid));
967 break; /* NB ibc_tx_queue_nocred checked */
970 /* Last credit reserved for NOOP */
971 if (conn->ibc_credits == 1 &&
972 tx->tx_msg->ibm_type != IBLND_MSG_NOOP) {
973 CDEBUG(D_NET, "%s: not using last credit\n",
974 libcfs_nid2str(conn->ibc_peer->ibp_nid));
975 break; /* NB ibc_tx_noops checked */
979 list_del(&tx->tx_list);
982 /* NB don't drop ibc_lock before bumping tx_sending */
984 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP &&
985 !kiblnd_send_noop(conn)) {
987 spin_unlock(&conn->ibc_lock);
988 kiblnd_tx_done(ni, tx);
989 spin_lock(&conn->ibc_lock);
990 CDEBUG(D_NET, "%s: redundant noop\n",
991 libcfs_nid2str(conn->ibc_peer->ibp_nid));
995 kiblnd_pack_msg(ni, tx->tx_msg, conn->ibc_outstanding_credits,
996 conn->ibc_peer->ibp_nid, conn->ibc_incarnation);
998 conn->ibc_outstanding_credits = 0;
999 conn->ibc_nsends_posted++;
1001 conn->ibc_credits--;
1003 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
1004 * PUT. If so, it was first queued here as a PUT_REQ, sent and
1005 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
1006 * and then re-queued here. It's (just) possible that
1007 * tx_sending is non-zero if we've not done the tx_complete() from
1008 * the first send; hence the ++ rather than = below. */
1011 list_add (&tx->tx_list, &conn->ibc_active_txs);
1016 for (i = 0; i < tx->tx_nwrq - 1; i++) {
1017 LASSERT (tx->tx_wrq[i].opcode == IB_WR_RDMA_WRITE);
1018 LASSERT (tx->tx_wrq[i].next == &tx->tx_wrq[i+1]);
1019 LASSERT (tx->tx_wrq[i].sg_list == &tx->tx_sge[i]);
1021 CDEBUG(D_WARNING, "WORK[%d]: RDMA "LPX64
1022 " for %d k %x -> "LPX64" k %x\n", i,
1023 tx->tx_wrq[i].sg_list->addr,
1024 tx->tx_wrq[i].sg_list->length,
1025 tx->tx_wrq[i].sg_list->lkey,
1026 tx->tx_wrq[i].wr.rdma.remote_addr,
1027 tx->tx_wrq[i].wr.rdma.rkey);
1030 LASSERT (tx->tx_wrq[i].opcode == IB_WR_SEND);
1031 LASSERT (tx->tx_wrq[i].next == NULL);
1032 LASSERT (tx->tx_wrq[i].sg_list == &tx->tx_sge[i]);
1034 CDEBUG(D_WARNING, "WORK[%d]: SEND "LPX64" for %d k %x\n", i,
1035 tx->tx_wrq[i].sg_list->addr,
1036 tx->tx_wrq[i].sg_list->length,
1037 tx->tx_wrq[i].sg_list->lkey);
1040 /* I'm still holding ibc_lock! */
1041 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1044 rc = ib_post_send(conn->ibc_cmid->qp, tx->tx_wrq, &bad_wrq);
1046 conn->ibc_last_send = jiffies;
1049 /* NB credits are transferred in the actual
1050 * message, which can only be the last work item */
1051 conn->ibc_outstanding_credits += tx->tx_msg->ibm_credits;
1053 conn->ibc_credits++;
1054 conn->ibc_nsends_posted--;
1060 done = (tx->tx_sending == 0);
1062 list_del (&tx->tx_list);
1064 spin_unlock(&conn->ibc_lock);
1066 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1067 CERROR("Error %d posting transmit to %s\n",
1068 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
1070 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
1071 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
1073 kiblnd_close_conn(conn, rc);
1076 kiblnd_tx_done(ni, tx);
1081 spin_unlock(&conn->ibc_lock);
1085 kiblnd_tx_complete (kib_tx_t *tx, int status)
1087 int failed = (status != IB_WC_SUCCESS);
1088 kib_conn_t *conn = tx->tx_conn;
1091 LASSERT (tx->tx_sending > 0);
1094 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1095 CDEBUG(D_NETERROR, "Tx -> %s cookie "LPX64
1096 " sending %d waiting %d: failed %d\n",
1097 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1098 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1101 kiblnd_close_conn(conn, -EIO);
1103 kiblnd_peer_alive(conn->ibc_peer);
1106 spin_lock(&conn->ibc_lock);
1108 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1109 * gets to free it, which also drops its ref on 'conn'. */
1112 conn->ibc_nsends_posted--;
1115 tx->tx_waiting = 0; /* don't wait for peer */
1116 tx->tx_status = -EIO;
1119 idle = (tx->tx_sending == 0) && /* This is the final callback */
1120 !tx->tx_waiting && /* Not waiting for peer */
1121 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1123 list_del(&tx->tx_list);
1125 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1127 spin_unlock(&conn->ibc_lock);
1130 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1132 kiblnd_check_sends(conn);
1134 kiblnd_conn_decref(conn); /* ...until here */
1138 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1140 kib_net_t *net = ni->ni_data;
1141 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1142 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1143 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1145 LASSERT (net != NULL);
1146 LASSERT (tx->tx_nwrq >= 0);
1147 LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1148 LASSERT (nob <= IBLND_MSG_SIZE);
1150 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1152 sge->addr = tx->tx_msgaddr;
1153 sge->lkey = net->ibn_dev->ibd_mr->lkey;
1156 memset(wrq, 0, sizeof(*wrq));
1159 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1162 wrq->opcode = IB_WR_SEND;
1163 wrq->send_flags = IB_SEND_SIGNALED;
1169 kiblnd_init_rdma (lnet_ni_t *ni, kib_tx_t *tx, int type,
1170 int nob, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1172 kib_msg_t *ibmsg = tx->tx_msg;
1173 kib_rdma_desc_t *srcrd = tx->tx_rd;
1174 struct ib_sge *sge = &tx->tx_sge[0];
1175 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1178 #if IBLND_MAP_ON_DEMAND
1179 LASSERT (!in_interrupt());
1180 LASSERT (tx->tx_nwrq == 0);
1181 LASSERT (type == IBLND_MSG_GET_DONE ||
1182 type == IBLND_MSG_PUT_DONE);
1184 sge->addr = srcrd->rd_addr;
1185 sge->lkey = srcrd->rd_key;
1188 wrq = &tx->tx_wrq[0];
1190 wrq->next = &tx->tx_wrq[1];
1191 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1194 wrq->opcode = IB_WR_RDMA_WRITE;
1195 wrq->send_flags = 0;
1197 wrq->wr.rdma.remote_addr = dstrd->rd_addr;
1198 wrq->wr.rdma.rkey = dstrd->rd_key;
1202 /* CAVEAT EMPTOR: this 'consumes' the frags in 'dstrd' */
1204 kib_rdma_frag_t *srcfrag;
1206 kib_rdma_frag_t *dstfrag;
1210 LASSERT (!in_interrupt());
1211 LASSERT (tx->tx_nwrq == 0);
1212 LASSERT (type == IBLND_MSG_GET_DONE ||
1213 type == IBLND_MSG_PUT_DONE);
1215 srcidx = dstidx = 0;
1216 srcfrag = &srcrd->rd_frags[0];
1217 dstfrag = &dstrd->rd_frags[0];
1220 if (srcidx >= srcrd->rd_nfrags) {
1221 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1226 if (dstidx == dstrd->rd_nfrags) {
1227 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1232 if (tx->tx_nwrq == IBLND_MAX_RDMA_FRAGS) {
1233 CERROR("RDMA too fragmented: %d/%d src %d/%d dst frags\n",
1234 srcidx, srcrd->rd_nfrags,
1235 dstidx, dstrd->rd_nfrags);
1240 wrknob = MIN(MIN(srcfrag->rf_nob, dstfrag->rf_nob), resid);
1242 sge = &tx->tx_sge[tx->tx_nwrq];
1243 sge->addr = srcfrag->rf_addr;
1244 sge->length = wrknob;
1245 sge->lkey = srcrd->rd_key;
1247 wrq = &tx->tx_wrq[tx->tx_nwrq];
1249 wrq->next = wrq + 1;
1250 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1253 wrq->opcode = IB_WR_RDMA_WRITE;
1254 wrq->send_flags = 0;
1256 wrq->wr.rdma.remote_addr = dstfrag->rf_addr;
1257 wrq->wr.rdma.rkey = dstrd->rd_key;
1263 if (wrknob < srcfrag->rf_nob) {
1264 srcfrag->rf_nob -= wrknob;
1265 srcfrag->rf_addr += wrknob;
1271 if (wrknob < dstfrag->rf_nob) {
1272 dstfrag->rf_nob -= wrknob;
1273 dstfrag->rf_addr += wrknob;
1282 if (rc < 0) /* no RDMA if completing with failure */
1285 ibmsg->ibm_u.completion.ibcm_status = rc;
1286 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1287 kiblnd_init_tx_msg(ni, tx, type, sizeof (kib_completion_msg_t));
1293 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1295 struct list_head *q;
1297 LASSERT (tx->tx_nwrq > 0); /* work items set up */
1298 LASSERT (!tx->tx_queued); /* not queued for sending already */
1301 tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
1303 if (tx->tx_conn == NULL) {
1304 kiblnd_conn_addref(conn);
1306 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1308 /* PUT_DONE first attached to conn as a PUT_REQ */
1309 LASSERT (tx->tx_conn == conn);
1310 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1313 switch (tx->tx_msg->ibm_type) {
1317 case IBLND_MSG_PUT_REQ:
1318 case IBLND_MSG_GET_REQ:
1319 q = &conn->ibc_tx_queue_rsrvd;
1322 case IBLND_MSG_PUT_NAK:
1323 case IBLND_MSG_PUT_ACK:
1324 case IBLND_MSG_PUT_DONE:
1325 case IBLND_MSG_GET_DONE:
1326 q = &conn->ibc_tx_queue_nocred;
1329 case IBLND_MSG_NOOP:
1330 q = &conn->ibc_tx_noops;
1333 case IBLND_MSG_IMMEDIATE:
1334 q = &conn->ibc_tx_queue;
1338 list_add_tail(&tx->tx_list, q);
1342 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1344 spin_lock(&conn->ibc_lock);
1345 kiblnd_queue_tx_locked(tx, conn);
1346 spin_unlock(&conn->ibc_lock);
1348 kiblnd_check_sends(conn);
1352 kiblnd_connect_peer (kib_peer_t *peer)
1354 struct rdma_cm_id *cmid;
1355 kib_net_t *net = peer->ibp_ni->ni_data;
1356 struct sockaddr_in srcaddr;
1357 struct sockaddr_in dstaddr;
1360 LASSERT (net != NULL);
1361 LASSERT (peer->ibp_connecting > 0);
1363 cmid = rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP);
1365 CERROR("Can't create CMID for %s: %ld\n",
1366 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1371 memset(&srcaddr, 0, sizeof(srcaddr));
1372 srcaddr.sin_family = AF_INET;
1373 srcaddr.sin_addr.s_addr = htonl(net->ibn_dev->ibd_ifip);
1375 memset(&dstaddr, 0, sizeof(dstaddr));
1376 dstaddr.sin_family = AF_INET;
1377 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1378 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1380 kiblnd_peer_addref(peer); /* cmid's ref */
1382 rc = rdma_resolve_addr(cmid,
1383 (struct sockaddr *)&srcaddr,
1384 (struct sockaddr *)&dstaddr,
1385 *kiblnd_tunables.kib_timeout * 1000);
1389 /* Can't initiate address resolution: */
1390 CERROR("Can't resolve addr for %s: %d\n",
1391 libcfs_nid2str(peer->ibp_nid), rc);
1393 kiblnd_peer_decref(peer); /* cmid's ref */
1394 rdma_destroy_id(cmid);
1396 kiblnd_peer_connect_failed(peer, 1, rc);
1400 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1405 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1406 unsigned long flags;
1409 /* If I get here, I've committed to send, so I complete the tx with
1410 * failure on any problems */
1412 LASSERT (tx->tx_conn == NULL); /* only set when assigned a conn */
1413 LASSERT (tx->tx_nwrq > 0); /* work items have been set up */
1415 /* First time, just use a read lock since I expect to find my peer
1417 read_lock_irqsave(g_lock, flags);
1419 peer = kiblnd_find_peer_locked(nid);
1420 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1421 /* Found a peer with an established connection */
1422 conn = kiblnd_get_conn_locked(peer);
1423 kiblnd_conn_addref(conn); /* 1 ref for me... */
1425 read_unlock_irqrestore(g_lock, flags);
1427 kiblnd_queue_tx(tx, conn);
1428 kiblnd_conn_decref(conn); /* ...to here */
1432 read_unlock(g_lock);
1433 /* Re-try with a write lock */
1436 peer = kiblnd_find_peer_locked(nid);
1438 if (list_empty(&peer->ibp_conns)) {
1439 /* found a peer, but it's still connecting... */
1440 LASSERT (peer->ibp_connecting != 0 ||
1441 peer->ibp_accepting != 0);
1442 list_add_tail (&tx->tx_list, &peer->ibp_tx_queue);
1443 write_unlock_irqrestore(g_lock, flags);
1445 conn = kiblnd_get_conn_locked(peer);
1446 kiblnd_conn_addref(conn); /* 1 ref for me... */
1448 write_unlock_irqrestore(g_lock, flags);
1450 kiblnd_queue_tx(tx, conn);
1451 kiblnd_conn_decref(conn); /* ...to here */
1456 write_unlock_irqrestore(g_lock, flags);
1458 /* Allocate a peer ready to add to the peer table and retry */
1459 rc = kiblnd_create_peer(ni, &peer, nid);
1461 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1462 tx->tx_status = -EHOSTUNREACH;
1464 kiblnd_tx_done(ni, tx);
1468 write_lock_irqsave(g_lock, flags);
1470 peer2 = kiblnd_find_peer_locked(nid);
1471 if (peer2 != NULL) {
1472 if (list_empty(&peer2->ibp_conns)) {
1473 /* found a peer, but it's still connecting... */
1474 LASSERT (peer2->ibp_connecting != 0 ||
1475 peer2->ibp_accepting != 0);
1476 list_add_tail (&tx->tx_list, &peer2->ibp_tx_queue);
1477 write_unlock_irqrestore(g_lock, flags);
1479 conn = kiblnd_get_conn_locked(peer2);
1480 kiblnd_conn_addref(conn); /* 1 ref for me... */
1482 write_unlock_irqrestore(g_lock, flags);
1484 kiblnd_queue_tx(tx, conn);
1485 kiblnd_conn_decref(conn); /* ...to here */
1488 kiblnd_peer_decref(peer);
1492 /* Brand new peer */
1493 LASSERT (peer->ibp_connecting == 0);
1494 peer->ibp_connecting = 1;
1496 /* always called with a ref on ni, which prevents ni being shutdown */
1497 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1499 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1501 kiblnd_peer_addref(peer);
1502 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1504 write_unlock_irqrestore(g_lock, flags);
1506 kiblnd_connect_peer(peer);
1507 kiblnd_peer_decref(peer);
1511 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1513 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1514 int type = lntmsg->msg_type;
1515 lnet_process_id_t target = lntmsg->msg_target;
1516 int target_is_router = lntmsg->msg_target_is_router;
1517 int routing = lntmsg->msg_routing;
1518 unsigned int payload_niov = lntmsg->msg_niov;
1519 struct iovec *payload_iov = lntmsg->msg_iov;
1520 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1521 unsigned int payload_offset = lntmsg->msg_offset;
1522 unsigned int payload_nob = lntmsg->msg_len;
1528 /* NB 'private' is different depending on what we're sending.... */
1530 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1531 payload_nob, payload_niov, libcfs_id2str(target));
1533 LASSERT (payload_nob == 0 || payload_niov > 0);
1534 LASSERT (payload_niov <= LNET_MAX_IOV);
1536 /* Thread context */
1537 LASSERT (!in_interrupt());
1538 /* payload is either all vaddrs or all pages */
1539 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1547 LASSERT (payload_nob == 0);
1551 if (routing || target_is_router)
1552 break; /* send IMMEDIATE */
1554 /* is the REPLY message too small for RDMA? */
1555 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1556 if (nob <= IBLND_MSG_SIZE)
1557 break; /* send IMMEDIATE */
1559 tx = kiblnd_get_idle_tx(ni);
1561 CERROR("Can allocate txd for GET to %s: \n",
1562 libcfs_nid2str(target.nid));
1567 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1568 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1570 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1571 rc = kiblnd_setup_rd_iov(ni, tx,
1572 &ibmsg->ibm_u.get.ibgm_rd,
1573 lntmsg->msg_md->md_niov,
1574 lntmsg->msg_md->md_iov.iov,
1575 0, lntmsg->msg_md->md_length);
1577 rc = kiblnd_setup_rd_kiov(ni, tx,
1578 &ibmsg->ibm_u.get.ibgm_rd,
1579 lntmsg->msg_md->md_niov,
1580 lntmsg->msg_md->md_iov.kiov,
1581 0, lntmsg->msg_md->md_length);
1583 CERROR("Can't setup GET sink for %s: %d\n",
1584 libcfs_nid2str(target.nid), rc);
1585 kiblnd_tx_done(ni, tx);
1588 #if IBLND_MAP_ON_DEMAND
1589 nob = sizeof(kib_get_msg_t);
1591 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1593 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1595 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1596 if (tx->tx_lntmsg[1] == NULL) {
1597 CERROR("Can't create reply for GET -> %s\n",
1598 libcfs_nid2str(target.nid));
1599 kiblnd_tx_done(ni, tx);
1603 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1604 tx->tx_waiting = 1; /* waiting for GET_DONE */
1605 kiblnd_launch_tx(ni, tx, target.nid);
1608 case LNET_MSG_REPLY:
1610 /* Is the payload small enough not to need RDMA? */
1611 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1612 if (nob <= IBLND_MSG_SIZE)
1613 break; /* send IMMEDIATE */
1615 tx = kiblnd_get_idle_tx(ni);
1617 CERROR("Can't allocate %s txd for %s\n",
1618 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1619 libcfs_nid2str(target.nid));
1623 if (payload_kiov == NULL)
1624 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1625 payload_niov, payload_iov,
1626 payload_offset, payload_nob);
1628 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1629 payload_niov, payload_kiov,
1630 payload_offset, payload_nob);
1632 CERROR("Can't setup PUT src for %s: %d\n",
1633 libcfs_nid2str(target.nid), rc);
1634 kiblnd_tx_done(ni, tx);
1639 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1640 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1641 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1643 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1644 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1645 kiblnd_launch_tx(ni, tx, target.nid);
1649 /* send IMMEDIATE */
1651 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1654 tx = kiblnd_get_idle_tx(ni);
1656 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1657 type, libcfs_nid2str(target.nid));
1662 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1664 if (payload_kiov != NULL)
1665 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1666 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1667 payload_niov, payload_kiov,
1668 payload_offset, payload_nob);
1670 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1671 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1672 payload_niov, payload_iov,
1673 payload_offset, payload_nob);
1675 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1676 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1678 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1679 kiblnd_launch_tx(ni, tx, target.nid);
1684 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1686 lnet_process_id_t target = lntmsg->msg_target;
1687 unsigned int niov = lntmsg->msg_niov;
1688 struct iovec *iov = lntmsg->msg_iov;
1689 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1690 unsigned int offset = lntmsg->msg_offset;
1691 unsigned int nob = lntmsg->msg_len;
1695 tx = kiblnd_get_idle_tx(ni);
1697 CERROR("Can't get tx for REPLY to %s\n",
1698 libcfs_nid2str(target.nid));
1704 else if (kiov == NULL)
1705 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1706 niov, iov, offset, nob);
1708 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1709 niov, kiov, offset, nob);
1712 CERROR("Can't setup GET src for %s: %d\n",
1713 libcfs_nid2str(target.nid), rc);
1717 rc = kiblnd_init_rdma(ni, tx, IBLND_MSG_GET_DONE, nob,
1718 &rx->rx_msg->ibm_u.get.ibgm_rd,
1719 rx->rx_msg->ibm_u.get.ibgm_cookie);
1721 CERROR("Can't setup rdma for GET from %s: %d\n",
1722 libcfs_nid2str(target.nid), rc);
1727 /* No RDMA: local completion may happen now! */
1728 lnet_finalize(ni, lntmsg, 0);
1730 /* RDMA: lnet_finalize(lntmsg) when it
1732 tx->tx_lntmsg[0] = lntmsg;
1735 kiblnd_queue_tx(tx, rx->rx_conn);
1739 kiblnd_tx_done(ni, tx);
1741 lnet_finalize(ni, lntmsg, -EIO);
1745 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1746 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1747 unsigned int offset, unsigned int mlen, unsigned int rlen)
1749 kib_rx_t *rx = private;
1750 kib_msg_t *rxmsg = rx->rx_msg;
1751 kib_conn_t *conn = rx->rx_conn;
1755 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1758 LASSERT (mlen <= rlen);
1759 LASSERT (!in_interrupt());
1760 /* Either all pages or all vaddrs */
1761 LASSERT (!(kiov != NULL && iov != NULL));
1763 switch (rxmsg->ibm_type) {
1767 case IBLND_MSG_IMMEDIATE:
1768 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1769 if (nob > rx->rx_nob) {
1770 CERROR ("Immediate message from %s too big: %d(%d)\n",
1771 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1778 lnet_copy_flat2kiov(niov, kiov, offset,
1779 IBLND_MSG_SIZE, rxmsg,
1780 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1783 lnet_copy_flat2iov(niov, iov, offset,
1784 IBLND_MSG_SIZE, rxmsg,
1785 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1787 lnet_finalize (ni, lntmsg, 0);
1790 case IBLND_MSG_PUT_REQ:
1792 lnet_finalize(ni, lntmsg, 0);
1793 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1794 rxmsg->ibm_u.putreq.ibprm_cookie);
1798 tx = kiblnd_get_idle_tx(ni);
1800 CERROR("Can't allocate tx for %s\n",
1801 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1802 /* Not replying will break the connection */
1809 rc = kiblnd_setup_rd_iov(ni, tx,
1810 &txmsg->ibm_u.putack.ibpam_rd,
1811 niov, iov, offset, mlen);
1813 rc = kiblnd_setup_rd_kiov(ni, tx,
1814 &txmsg->ibm_u.putack.ibpam_rd,
1815 niov, kiov, offset, mlen);
1817 CERROR("Can't setup PUT sink for %s: %d\n",
1818 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1819 kiblnd_tx_done(ni, tx);
1820 /* tell peer it's over */
1821 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1822 rxmsg->ibm_u.putreq.ibprm_cookie);
1826 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1827 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1828 #if IBLND_MAP_ON_DEMAND
1829 nob = sizeof(kib_putack_msg_t);
1831 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1833 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1835 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1836 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1837 kiblnd_queue_tx(tx, conn);
1839 /* reposted buffer reserved for PUT_DONE */
1840 post_credit = IBLND_POSTRX_NO_CREDIT;
1843 case IBLND_MSG_GET_REQ:
1844 if (lntmsg != NULL) {
1845 /* Optimized GET; RDMA lntmsg's payload */
1846 kiblnd_reply(ni, rx, lntmsg);
1848 /* GET didn't match anything */
1849 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1851 rxmsg->ibm_u.get.ibgm_cookie);
1856 kiblnd_post_rx(rx, post_credit);
1861 kiblnd_thread_start (int (*fn)(void *arg), void *arg)
1863 long pid = kernel_thread (fn, arg, 0);
1868 atomic_inc (&kiblnd_data.kib_nthreads);
1873 kiblnd_thread_fini (void)
1875 atomic_dec (&kiblnd_data.kib_nthreads);
1879 kiblnd_peer_alive (kib_peer_t *peer)
1881 /* This is racy, but everyone's only writing cfs_time_current() */
1882 peer->ibp_last_alive = cfs_time_current();
1887 kiblnd_peer_notify (kib_peer_t *peer)
1889 time_t last_alive = 0;
1891 unsigned long flags;
1893 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1895 if (list_empty(&peer->ibp_conns) &&
1896 peer->ibp_accepting == 0 &&
1897 peer->ibp_connecting == 0 &&
1898 peer->ibp_error != 0) {
1899 error = peer->ibp_error;
1900 peer->ibp_error = 0;
1902 last_alive = cfs_time_current_sec() -
1903 cfs_duration_sec(cfs_time_current() -
1904 peer->ibp_last_alive);
1907 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1910 lnet_notify(peer->ibp_ni,
1911 peer->ibp_nid, 0, last_alive);
1915 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1917 /* This just does the immediate housekeeping. 'error' is zero for a
1918 * normal shutdown which can happen only after the connection has been
1919 * established. If the connection is established, schedule the
1920 * connection to be finished off by the connd. Otherwise the connd is
1921 * already dealing with it (either to set it up or tear it down).
1922 * Caller holds kib_global_lock exclusively in irq context */
1923 unsigned long flags;
1924 kib_peer_t *peer = conn->ibc_peer;
1926 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1928 if (error != 0 && conn->ibc_comms_error == 0)
1929 conn->ibc_comms_error = error;
1931 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1932 return; /* already being handled */
1935 list_empty(&conn->ibc_tx_noops) &&
1936 list_empty(&conn->ibc_tx_queue) &&
1937 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1938 list_empty(&conn->ibc_tx_queue_nocred) &&
1939 list_empty(&conn->ibc_active_txs)) {
1940 CDEBUG(D_NET, "closing conn to %s\n",
1941 libcfs_nid2str(peer->ibp_nid));
1943 CDEBUG(D_NETERROR, "Closing conn to %s: error %d%s%s%s%s%s\n",
1944 libcfs_nid2str(peer->ibp_nid), error,
1945 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1946 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1947 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1948 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1949 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1952 list_del (&conn->ibc_list);
1953 /* connd (see below) takes over ibc_list's ref */
1955 if (list_empty (&peer->ibp_conns) && /* no more conns */
1956 kiblnd_peer_active(peer)) { /* still in peer table */
1957 kiblnd_unlink_peer_locked(peer);
1959 /* set/clear error on last conn */
1960 peer->ibp_error = conn->ibc_comms_error;
1963 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1965 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1967 list_add_tail (&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1968 wake_up (&kiblnd_data.kib_connd_waitq);
1970 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1974 kiblnd_close_conn (kib_conn_t *conn, int error)
1976 unsigned long flags;
1978 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1980 kiblnd_close_conn_locked(conn, error);
1982 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1986 kiblnd_handle_early_rxs(kib_conn_t *conn)
1988 unsigned long flags;
1991 LASSERT (!in_interrupt());
1992 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1994 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1995 while (!list_empty(&conn->ibc_early_rxs)) {
1996 rx = list_entry(conn->ibc_early_rxs.next,
1998 list_del(&rx->rx_list);
1999 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2001 kiblnd_handle_rx(rx);
2003 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2005 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2009 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
2011 LIST_HEAD (zombies);
2012 struct list_head *tmp;
2013 struct list_head *nxt;
2016 spin_lock(&conn->ibc_lock);
2018 list_for_each_safe (tmp, nxt, txs) {
2019 tx = list_entry (tmp, kib_tx_t, tx_list);
2021 if (txs == &conn->ibc_active_txs) {
2022 LASSERT (!tx->tx_queued);
2023 LASSERT (tx->tx_waiting ||
2024 tx->tx_sending != 0);
2026 LASSERT (tx->tx_queued);
2029 tx->tx_status = -ECONNABORTED;
2033 if (tx->tx_sending == 0) {
2034 list_del (&tx->tx_list);
2035 list_add (&tx->tx_list, &zombies);
2039 spin_unlock(&conn->ibc_lock);
2041 kiblnd_txlist_done(conn->ibc_peer->ibp_ni,
2042 &zombies, -ECONNABORTED);
2046 kiblnd_finalise_conn (kib_conn_t *conn)
2048 LASSERT (!in_interrupt());
2049 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2051 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2053 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2054 * for connections that didn't get as far as being connected, because
2055 * rdma_disconnect() does this for free. */
2056 kiblnd_abort_receives(conn);
2058 /* Complete all tx descs not waiting for sends to complete.
2059 * NB we should be safe from RDMA now that the QP has changed state */
2061 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2062 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2063 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2064 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2065 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2067 kiblnd_handle_early_rxs(conn);
2071 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
2073 LIST_HEAD (zombies);
2074 unsigned long flags;
2076 LASSERT (error != 0);
2077 LASSERT (!in_interrupt());
2079 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2082 LASSERT (peer->ibp_connecting > 0);
2083 peer->ibp_connecting--;
2085 LASSERT (peer->ibp_accepting > 0);
2086 peer->ibp_accepting--;
2089 if (peer->ibp_connecting != 0 ||
2090 peer->ibp_accepting != 0) {
2091 /* another connection attempt under way... */
2092 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2096 if (list_empty(&peer->ibp_conns)) {
2097 /* Take peer's blocked transmits to complete with error */
2098 list_add(&zombies, &peer->ibp_tx_queue);
2099 list_del_init(&peer->ibp_tx_queue);
2101 if (kiblnd_peer_active(peer))
2102 kiblnd_unlink_peer_locked(peer);
2104 peer->ibp_error = error;
2106 /* Can't have blocked transmits if there are connections */
2107 LASSERT (list_empty(&peer->ibp_tx_queue));
2110 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2112 kiblnd_peer_notify(peer);
2114 if (list_empty (&zombies))
2117 CDEBUG (D_NETERROR, "Deleting messages for %s: connection failed\n",
2118 libcfs_nid2str(peer->ibp_nid));
2120 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2124 kiblnd_connreq_done(kib_conn_t *conn, int status)
2126 struct list_head txs;
2128 kib_peer_t *peer = conn->ibc_peer;
2130 unsigned long flags;
2133 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2135 CDEBUG(D_NET,"%s: %d, %d\n", libcfs_nid2str(peer->ibp_nid),
2138 LASSERT (!in_interrupt());
2139 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2140 peer->ibp_connecting > 0) ||
2141 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2142 peer->ibp_accepting > 0));
2144 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2145 conn->ibc_connvars = NULL;
2148 /* failed to establish connection */
2149 kiblnd_peer_connect_failed(peer, active, status);
2150 kiblnd_finalise_conn(conn);
2154 /* connection established */
2155 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2157 conn->ibc_last_send = jiffies;
2158 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2159 kiblnd_peer_alive(peer);
2161 /* Add conn to peer's list and nuke any dangling conns from a different
2162 * peer instance... */
2163 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2164 list_add(&conn->ibc_list, &peer->ibp_conns);
2166 peer->ibp_connecting--;
2168 peer->ibp_accepting--;
2170 kiblnd_close_stale_conns_locked(peer, conn->ibc_incarnation);
2172 /* grab pending txs while I have the lock */
2173 list_add(&txs, &peer->ibp_tx_queue);
2174 list_del_init(&peer->ibp_tx_queue);
2176 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2177 conn->ibc_comms_error != 0) { /* error has happened already */
2178 lnet_ni_t *ni = peer->ibp_ni;
2180 /* start to shut down connection */
2181 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2182 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2184 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2189 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2191 /* Schedule blocked txs */
2192 spin_lock (&conn->ibc_lock);
2193 while (!list_empty (&txs)) {
2194 tx = list_entry (txs.next, kib_tx_t, tx_list);
2195 list_del (&tx->tx_list);
2197 kiblnd_queue_tx_locked(tx, conn);
2199 spin_unlock (&conn->ibc_lock);
2201 kiblnd_check_sends(conn);
2203 /* schedule blocked rxs */
2204 kiblnd_handle_early_rxs(conn);
2208 kiblnd_reject(struct rdma_cm_id *cmid, int why)
2211 kib_rej_t rej = {.ibr_magic = IBLND_MSG_MAGIC,
2212 .ibr_version = IBLND_MSG_VERSION,
2215 rc = rdma_reject(cmid, &rej, sizeof(rej));
2218 CWARN("Error %d sending reject\n", rc);
2222 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2225 kib_msg_t *reqmsg = priv;
2226 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2227 struct rdma_conn_param cp;
2228 unsigned long flags;
2229 lnet_ni_t *ni = NULL;
2236 int rej = IBLND_REJECT_FATAL;
2238 LASSERT (!in_interrupt());
2240 /* cmid inherits 'context' from the corresponding listener id */
2241 ibdev = (kib_dev_t *)cmid->context;
2242 LASSERT (ibdev != NULL);
2244 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2245 CERROR("Short connection request\n");
2249 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2250 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC) ||
2251 (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2252 reqmsg->ibm_version != IBLND_MSG_VERSION) ||
2253 (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2254 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION))) {
2255 /* Future protocol version compatibility support! If the
2256 * o2iblnd-specific protocol changes, or when LNET unifies
2257 * protocols over all LNDs, the initial connection will
2258 * negotiate a protocol version. I trap this here to avoid
2259 * console errors; the reject tells the peer which protocol I
2264 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2266 CERROR("Can't parse connection request: %d\n", rc);
2270 nid = reqmsg->ibm_srcnid;
2272 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2273 CERROR("Unexpected connreq msg type: %x from %s\n",
2274 reqmsg->ibm_type, libcfs_nid2str(nid));
2278 if (reqmsg->ibm_u.connparams.ibcp_queue_depth != IBLND_MSG_QUEUE_SIZE) {
2279 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2280 libcfs_nid2str(nid),
2281 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2282 IBLND_MSG_QUEUE_SIZE);
2286 if (reqmsg->ibm_u.connparams.ibcp_max_frags != IBLND_MAX_RDMA_FRAGS) {
2287 CERROR("Can't accept %s: incompatible max_frags %d (%d wanted)\n",
2288 libcfs_nid2str(nid),
2289 reqmsg->ibm_u.connparams.ibcp_max_frags,
2290 IBLND_MAX_RDMA_FRAGS);
2294 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2295 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2296 libcfs_nid2str(nid),
2297 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2302 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2303 if (ni == NULL || /* no matching net */
2304 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2305 ((kib_net_t*)ni->ni_data)->ibn_dev != ibdev) { /* wrong device */
2306 CERROR("Can't accept %s: bad dst nid %s\n",
2307 libcfs_nid2str(nid),
2308 libcfs_nid2str(reqmsg->ibm_dstnid));
2313 /* assume 'nid' is a new peer; create */
2314 rc = kiblnd_create_peer(ni, &peer, nid);
2316 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2317 rej = IBLND_REJECT_NO_RESOURCES;
2321 write_lock_irqsave(g_lock, flags);
2323 peer2 = kiblnd_find_peer_locked(nid);
2324 if (peer2 != NULL) {
2325 /* tie-break connection race in favour of the higher NID */
2326 if (peer2->ibp_connecting != 0 &&
2328 write_unlock_irqrestore(g_lock, flags);
2330 CWARN("Conn race %s\n",
2331 libcfs_nid2str(peer2->ibp_nid));
2333 kiblnd_peer_decref(peer);
2334 rej = IBLND_REJECT_CONN_RACE;
2338 peer2->ibp_accepting++;
2339 kiblnd_peer_addref(peer2);
2341 write_unlock_irqrestore(g_lock, flags);
2342 kiblnd_peer_decref(peer);
2345 /* Brand new peer */
2346 LASSERT (peer->ibp_accepting == 0);
2347 peer->ibp_accepting = 1;
2349 /* I have a ref on ni that prevents it being shutdown */
2350 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
2352 kiblnd_peer_addref(peer);
2353 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2355 write_unlock_irqrestore(g_lock, flags);
2358 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT);
2360 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2361 kiblnd_peer_decref(peer);
2362 rej = IBLND_REJECT_NO_RESOURCES;
2366 /* conn now "owns" cmid, so I return success from here on to ensure the
2367 * CM callback doesn't destroy cmid. */
2369 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2370 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE;
2371 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE;
2372 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits
2375 ackmsg = &conn->ibc_connvars->cv_msg;
2376 memset(ackmsg, 0, sizeof(*ackmsg));
2378 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2379 sizeof(ackmsg->ibm_u.connparams));
2380 ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE;
2381 ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2382 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2383 kiblnd_pack_msg(ni, ackmsg, 0, nid, reqmsg->ibm_srcstamp);
2385 memset(&cp, 0, sizeof(cp));
2386 cp.private_data = ackmsg;
2387 cp.private_data_len = ackmsg->ibm_nob;
2388 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2389 cp.initiator_depth = 0;
2390 cp.flow_control = 1;
2391 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2392 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2394 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2396 rc = rdma_accept(cmid, &cp);
2398 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2399 kiblnd_reject(cmid, IBLND_REJECT_FATAL);
2400 kiblnd_connreq_done(conn, rc);
2401 kiblnd_conn_decref(conn);
2411 kiblnd_reject(cmid, rej);
2412 return -ECONNREFUSED;
2416 kiblnd_reconnect (kib_conn_t *conn, char *why)
2418 kib_peer_t *peer = conn->ibc_peer;
2420 unsigned long flags;
2422 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2423 LASSERT (peer->ibp_connecting > 0); /* 'conn' at least */
2425 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2427 /* retry connection if it's still needed and no other connection
2428 * attempts (active or passive) are in progress */
2429 if (!list_empty(&peer->ibp_tx_queue) &&
2430 peer->ibp_connecting == 1 &&
2431 peer->ibp_accepting == 0) {
2433 peer->ibp_connecting++;
2436 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2439 CDEBUG(D_NETERROR, "%s: retrying (%s)\n",
2440 libcfs_nid2str(peer->ibp_nid), why);
2441 kiblnd_connect_peer(peer);
2446 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2448 kib_peer_t *peer = conn->ibc_peer;
2450 LASSERT (!in_interrupt());
2451 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2454 case IB_CM_REJ_STALE_CONN:
2455 kiblnd_reconnect(conn, "stale");
2458 case IB_CM_REJ_CONSUMER_DEFINED:
2459 if (priv_nob >= sizeof(kib_rej_t)) {
2460 kib_rej_t *rej = priv;
2462 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2463 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2464 __swab32s(&rej->ibr_magic);
2465 __swab16s(&rej->ibr_version);
2468 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2469 rej->ibr_magic != LNET_PROTO_MAGIC) {
2470 CERROR("%s rejected: consumer defined fatal error\n",
2471 libcfs_nid2str(peer->ibp_nid));
2475 if (rej->ibr_version != IBLND_MSG_VERSION) {
2476 CERROR("%s rejected: o2iblnd version %d error\n",
2477 libcfs_nid2str(peer->ibp_nid),
2482 switch (rej->ibr_why) {
2483 case IBLND_REJECT_CONN_RACE:
2484 kiblnd_reconnect(conn, "conn race");
2487 case IBLND_REJECT_NO_RESOURCES:
2488 CERROR("%s rejected: o2iblnd no resources\n",
2489 libcfs_nid2str(peer->ibp_nid));
2491 case IBLND_REJECT_FATAL:
2492 CERROR("%s rejected: o2iblnd fatal error\n",
2493 libcfs_nid2str(peer->ibp_nid));
2496 CERROR("%s rejected: o2iblnd reason %d\n",
2497 libcfs_nid2str(peer->ibp_nid),
2505 CDEBUG(D_NETERROR, "%s rejected: reason %d, size %d\n",
2506 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2510 kiblnd_connreq_done(conn, -ECONNREFUSED);
2514 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2516 kib_peer_t *peer = conn->ibc_peer;
2517 lnet_ni_t *ni = peer->ibp_ni;
2518 kib_net_t *net = ni->ni_data;
2519 kib_msg_t *msg = priv;
2520 int rc = kiblnd_unpack_msg(msg, priv_nob);
2521 unsigned long flags;
2523 LASSERT (net != NULL);
2526 CERROR("Can't unpack connack from %s: %d\n",
2527 libcfs_nid2str(peer->ibp_nid), rc);
2531 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2532 CERROR("Unexpected message %d from %s\n",
2533 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2538 if (msg->ibm_u.connparams.ibcp_queue_depth != IBLND_MSG_QUEUE_SIZE) {
2539 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2540 libcfs_nid2str(peer->ibp_nid),
2541 msg->ibm_u.connparams.ibcp_queue_depth,
2542 IBLND_MSG_QUEUE_SIZE);
2547 if (msg->ibm_u.connparams.ibcp_max_frags != IBLND_MAX_RDMA_FRAGS) {
2548 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2549 libcfs_nid2str(peer->ibp_nid),
2550 msg->ibm_u.connparams.ibcp_max_frags,
2551 IBLND_MAX_RDMA_FRAGS);
2556 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2557 CERROR("%s max message size %d too big (%d max)\n",
2558 libcfs_nid2str(peer->ibp_nid),
2559 msg->ibm_u.connparams.ibcp_max_msg_size,
2565 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2566 if (msg->ibm_dstnid == ni->ni_nid &&
2567 msg->ibm_dststamp == net->ibn_incarnation)
2571 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2574 CERROR("Stale connection reply from %s\n",
2575 libcfs_nid2str(peer->ibp_nid));
2579 conn->ibc_incarnation = msg->ibm_srcstamp;
2580 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE;
2581 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE;
2582 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits
2585 kiblnd_connreq_done(conn, 0);
2589 /* NB My QP has already established itself, so I handle anything going
2590 * wrong here by setting ibc_comms_error.
2591 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2592 * immediately tears it down. */
2595 conn->ibc_comms_error = rc;
2596 kiblnd_connreq_done(conn, 0);
2600 kiblnd_active_connect (struct rdma_cm_id *cmid)
2602 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2605 struct rdma_conn_param cp;
2608 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT);
2610 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2611 kiblnd_peer_decref(peer); /* lose cmid's ref */
2615 /* conn "owns" cmid now, so I return success from here on to ensure the
2616 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2619 msg = &conn->ibc_connvars->cv_msg;
2621 memset(msg, 0, sizeof(*msg));
2622 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2623 msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE;
2624 msg->ibm_u.connparams.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2625 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2626 kiblnd_pack_msg(peer->ibp_ni, msg, 0, peer->ibp_nid, 0);
2628 memset(&cp, 0, sizeof(cp));
2629 cp.private_data = msg;
2630 cp.private_data_len = msg->ibm_nob;
2631 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2632 cp.initiator_depth = 0;
2633 cp.flow_control = 1;
2634 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2635 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2637 LASSERT(cmid->context == (void *)conn);
2638 LASSERT(conn->ibc_cmid == cmid);
2640 rc = rdma_connect(cmid, &cp);
2642 CERROR("Can't connect to %s: %d\n",
2643 libcfs_nid2str(peer->ibp_nid), rc);
2644 kiblnd_connreq_done(conn, rc);
2645 kiblnd_conn_decref(conn);
2652 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2658 switch (event->event) {
2662 case RDMA_CM_EVENT_CONNECT_REQUEST:
2663 /* destroy cmid on failure */
2664 rc = kiblnd_passive_connect(cmid,
2665 (void *)KIBLND_CONN_PARAM(event),
2666 KIBLND_CONN_PARAM_LEN(event));
2667 CDEBUG(D_NET, "connreq: %d\n", rc);
2670 case RDMA_CM_EVENT_ADDR_ERROR:
2671 peer = (kib_peer_t *)cmid->context;
2672 CDEBUG(D_NETERROR, "%s: ADDR ERROR %d\n",
2673 libcfs_nid2str(peer->ibp_nid), event->status);
2674 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2675 kiblnd_peer_decref(peer);
2676 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2678 case RDMA_CM_EVENT_ADDR_RESOLVED:
2679 peer = (kib_peer_t *)cmid->context;
2681 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2682 libcfs_nid2str(peer->ibp_nid), event->status);
2684 if (event->status != 0) {
2685 CDEBUG(D_NETERROR, "Can't resolve address for %s: %d\n",
2686 libcfs_nid2str(peer->ibp_nid), event->status);
2689 rc = rdma_resolve_route(
2690 cmid, *kiblnd_tunables.kib_timeout * 1000);
2693 /* Can't initiate route resolution */
2694 CERROR("Can't resolve route for %s: %d\n",
2695 libcfs_nid2str(peer->ibp_nid), rc);
2697 kiblnd_peer_connect_failed(peer, 1, rc);
2698 kiblnd_peer_decref(peer);
2699 return rc; /* rc != 0 destroys cmid */
2701 case RDMA_CM_EVENT_ROUTE_ERROR:
2702 peer = (kib_peer_t *)cmid->context;
2703 CDEBUG(D_NETERROR, "%s: ROUTE ERROR %d\n",
2704 libcfs_nid2str(peer->ibp_nid), event->status);
2705 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2706 kiblnd_peer_decref(peer);
2707 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2709 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2710 peer = (kib_peer_t *)cmid->context;
2711 CDEBUG(D_NET,"%s Route resolved: %d\n",
2712 libcfs_nid2str(peer->ibp_nid), event->status);
2714 if (event->status == 0)
2715 return kiblnd_active_connect(cmid);
2717 CDEBUG(D_NETERROR, "Can't resolve route for %s: %d\n",
2718 libcfs_nid2str(peer->ibp_nid), event->status);
2719 kiblnd_peer_connect_failed(peer, 1, event->status);
2720 kiblnd_peer_decref(peer);
2721 return event->status; /* rc != 0 destroys cmid */
2723 case RDMA_CM_EVENT_UNREACHABLE:
2724 conn = (kib_conn_t *)cmid->context;
2725 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2726 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2727 CDEBUG(D_NETERROR, "%s: UNREACHABLE %d\n",
2728 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2729 kiblnd_connreq_done(conn, -ENETDOWN);
2730 kiblnd_conn_decref(conn);
2733 case RDMA_CM_EVENT_CONNECT_ERROR:
2734 conn = (kib_conn_t *)cmid->context;
2735 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2736 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2737 CDEBUG(D_NETERROR, "%s: CONNECT ERROR %d\n",
2738 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2739 kiblnd_connreq_done(conn, -ENOTCONN);
2740 kiblnd_conn_decref(conn);
2743 case RDMA_CM_EVENT_REJECTED:
2744 conn = (kib_conn_t *)cmid->context;
2745 switch (conn->ibc_state) {
2749 case IBLND_CONN_PASSIVE_WAIT:
2750 CERROR ("%s: REJECTED %d\n",
2751 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2753 kiblnd_connreq_done(conn, -ECONNRESET);
2756 case IBLND_CONN_ACTIVE_CONNECT:
2757 kiblnd_rejected(conn, event->status,
2758 (void *)KIBLND_CONN_PARAM(event),
2759 KIBLND_CONN_PARAM_LEN(event));
2762 kiblnd_conn_decref(conn);
2765 case RDMA_CM_EVENT_ESTABLISHED:
2766 conn = (kib_conn_t *)cmid->context;
2767 switch (conn->ibc_state) {
2771 case IBLND_CONN_PASSIVE_WAIT:
2772 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2773 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2774 kiblnd_connreq_done(conn, 0);
2777 case IBLND_CONN_ACTIVE_CONNECT:
2778 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2779 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2780 kiblnd_check_connreply(conn,
2781 (void *)KIBLND_CONN_PARAM(event),
2782 KIBLND_CONN_PARAM_LEN(event));
2785 /* net keeps its ref on conn! */
2788 case RDMA_CM_EVENT_DISCONNECTED:
2789 conn = (kib_conn_t *)cmid->context;
2790 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2791 CERROR("%s DISCONNECTED\n",
2792 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2793 kiblnd_connreq_done(conn, -ECONNRESET);
2795 kiblnd_close_conn(conn, 0);
2797 kiblnd_conn_decref(conn);
2800 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2801 LCONSOLE_ERROR_MSG(0x131,
2802 "Received notification of device removal\n"
2803 "Please shutdown LNET to allow this to proceed\n");
2804 /* Can't remove network from underneath LNET for now, so I have
2811 kiblnd_check_txs (kib_conn_t *conn, struct list_head *txs)
2814 struct list_head *ttmp;
2817 spin_lock(&conn->ibc_lock);
2819 list_for_each (ttmp, txs) {
2820 tx = list_entry (ttmp, kib_tx_t, tx_list);
2822 if (txs != &conn->ibc_active_txs) {
2823 LASSERT (tx->tx_queued);
2825 LASSERT (!tx->tx_queued);
2826 LASSERT (tx->tx_waiting || tx->tx_sending != 0);
2829 if (time_after_eq (jiffies, tx->tx_deadline)) {
2835 spin_unlock(&conn->ibc_lock);
2840 kiblnd_conn_timed_out (kib_conn_t *conn)
2842 return kiblnd_check_txs(conn, &conn->ibc_tx_queue) ||
2843 kiblnd_check_txs(conn, &conn->ibc_tx_noops) ||
2844 kiblnd_check_txs(conn, &conn->ibc_tx_queue_rsrvd) ||
2845 kiblnd_check_txs(conn, &conn->ibc_tx_queue_nocred) ||
2846 kiblnd_check_txs(conn, &conn->ibc_active_txs);
2850 kiblnd_check_conns (int idx)
2852 struct list_head *peers = &kiblnd_data.kib_peers[idx];
2853 struct list_head *ptmp;
2856 struct list_head *ctmp;
2857 unsigned long flags;
2860 /* NB. We expect to have a look at all the peers and not find any
2861 * rdmas to time out, so we just use a shared lock while we
2863 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2865 list_for_each (ptmp, peers) {
2866 peer = list_entry (ptmp, kib_peer_t, ibp_list);
2868 list_for_each (ctmp, &peer->ibp_conns) {
2869 conn = list_entry (ctmp, kib_conn_t, ibc_list);
2871 LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
2873 /* In case we have enough credits to return via a
2874 * NOOP, but there were no non-blocking tx descs
2875 * free to do it last time... */
2876 kiblnd_check_sends(conn);
2878 if (!kiblnd_conn_timed_out(conn))
2881 /* Handle timeout by closing the whole connection. We
2882 * can only be sure RDMA activity has ceased once the
2883 * QP has been modified. */
2885 kiblnd_conn_addref(conn); /* 1 ref for me... */
2887 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2890 CERROR("Timed out RDMA with %s\n",
2891 libcfs_nid2str(peer->ibp_nid));
2893 kiblnd_close_conn(conn, -ETIMEDOUT);
2894 kiblnd_conn_decref(conn); /* ...until here */
2896 /* start again now I've dropped the lock */
2901 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2905 kiblnd_disconnect_conn (kib_conn_t *conn)
2907 LASSERT (!in_interrupt());
2908 LASSERT (current == kiblnd_data.kib_connd);
2909 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
2911 rdma_disconnect(conn->ibc_cmid);
2912 kiblnd_finalise_conn(conn);
2914 kiblnd_peer_notify(conn->ibc_peer);
2918 kiblnd_connd (void *arg)
2921 unsigned long flags;
2927 unsigned long deadline = jiffies;
2929 cfs_daemonize ("kiblnd_connd");
2930 cfs_block_allsigs ();
2932 init_waitqueue_entry (&wait, current);
2933 kiblnd_data.kib_connd = current;
2935 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2937 while (!kiblnd_data.kib_shutdown) {
2941 if (!list_empty (&kiblnd_data.kib_connd_zombies)) {
2942 conn = list_entry (kiblnd_data.kib_connd_zombies.next,
2943 kib_conn_t, ibc_list);
2944 list_del (&conn->ibc_list);
2946 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
2949 kiblnd_destroy_conn(conn);
2951 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
2954 if (!list_empty (&kiblnd_data.kib_connd_conns)) {
2955 conn = list_entry (kiblnd_data.kib_connd_conns.next,
2956 kib_conn_t, ibc_list);
2957 list_del (&conn->ibc_list);
2959 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
2962 kiblnd_disconnect_conn(conn);
2963 kiblnd_conn_decref(conn);
2965 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
2968 /* careful with the jiffy wrap... */
2969 timeout = (int)(deadline - jiffies);
2973 int chunk = kiblnd_data.kib_peer_hash_size;
2975 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2978 /* Time to check for RDMA timeouts on a few more
2979 * peers: I do checks every 'p' seconds on a
2980 * proportion of the peer table and I need to check
2981 * every connection 'n' times within a timeout
2982 * interval, to ensure I detect a timeout on any
2983 * connection within (n+1)/n times the timeout
2986 if (*kiblnd_tunables.kib_timeout > n * p)
2987 chunk = (chunk * n * p) /
2988 *kiblnd_tunables.kib_timeout;
2992 for (i = 0; i < chunk; i++) {
2993 kiblnd_check_conns(peer_index);
2994 peer_index = (peer_index + 1) %
2995 kiblnd_data.kib_peer_hash_size;
2999 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3005 /* Nothing to do for 'timeout' */
3006 set_current_state (TASK_INTERRUPTIBLE);
3007 add_wait_queue (&kiblnd_data.kib_connd_waitq, &wait);
3008 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3010 schedule_timeout (timeout);
3012 set_current_state (TASK_RUNNING);
3013 remove_wait_queue (&kiblnd_data.kib_connd_waitq, &wait);
3014 spin_lock_irqsave (&kiblnd_data.kib_connd_lock, flags);
3017 spin_unlock_irqrestore (&kiblnd_data.kib_connd_lock, flags);
3019 kiblnd_thread_fini();
3024 kiblnd_qp_event(struct ib_event *event, void *arg)
3026 kib_conn_t *conn = arg;
3028 switch (event->event) {
3029 case IB_EVENT_COMM_EST:
3030 CDEBUG(D_NET, "%s established\n",
3031 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3035 CERROR("%s: Async QP event type %d\n",
3036 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3042 kiblnd_complete (struct ib_wc *wc)
3044 switch (kiblnd_wreqid2type(wc->wr_id)) {
3048 case IBLND_WID_RDMA:
3049 /* We only get RDMA completion notification if it fails. All
3050 * subsequent work items, including the final SEND will fail
3051 * too. However we can't print out any more info about the
3052 * failing RDMA because 'tx' might be back on the idle list or
3053 * even reused already if we didn't manage to post all our work
3055 CDEBUG(D_NETERROR, "RDMA (tx: %p) failed: %d\n",
3056 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3060 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3064 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3071 kiblnd_cq_completion (struct ib_cq *cq, void *arg)
3073 /* NB I'm not allowed to schedule this conn once its refcount has
3074 * reached 0. Since fundamentally I'm racing with scheduler threads
3075 * consuming my CQ I could be called after all completions have
3076 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3077 * and this CQ is about to be destroyed so I NOOP. */
3078 kib_conn_t *conn = (kib_conn_t *)arg;
3079 unsigned long flags;
3081 LASSERT (cq == conn->ibc_cq);
3083 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3085 conn->ibc_ready = 1;
3087 if (!conn->ibc_scheduled &&
3088 (conn->ibc_nrx > 0 ||
3089 conn->ibc_nsends_posted > 0)) {
3090 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3091 conn->ibc_scheduled = 1;
3092 list_add_tail(&conn->ibc_sched_list,
3093 &kiblnd_data.kib_sched_conns);
3094 wake_up(&kiblnd_data.kib_sched_waitq);
3097 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3101 kiblnd_cq_event(struct ib_event *event, void *arg)
3103 kib_conn_t *conn = arg;
3105 CERROR("%s: async CQ event type %d\n",
3106 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3110 kiblnd_scheduler(void *arg)
3112 long id = (long)arg;
3115 unsigned long flags;
3122 snprintf(name, sizeof(name), "kiblnd_sd_%02ld", id);
3123 cfs_daemonize(name);
3124 cfs_block_allsigs();
3126 init_waitqueue_entry(&wait, current);
3128 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3130 while (!kiblnd_data.kib_shutdown) {
3131 if (busy_loops++ >= IBLND_RESCHED) {
3132 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3138 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3143 if (!list_empty(&kiblnd_data.kib_sched_conns)) {
3144 conn = list_entry(kiblnd_data.kib_sched_conns.next,
3145 kib_conn_t, ibc_sched_list);
3146 /* take over kib_sched_conns' ref on conn... */
3147 LASSERT(conn->ibc_scheduled);
3148 list_del(&conn->ibc_sched_list);
3149 conn->ibc_ready = 0;
3151 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3154 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3156 rc = ib_req_notify_cq(conn->ibc_cq,
3160 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3165 spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
3168 if (rc != 0 || conn->ibc_ready) {
3169 /* There may be another completion waiting; get
3170 * another scheduler to check while I handle
3172 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3173 list_add_tail(&conn->ibc_sched_list,
3174 &kiblnd_data.kib_sched_conns);
3175 wake_up(&kiblnd_data.kib_sched_waitq);
3177 conn->ibc_scheduled = 0;
3181 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock,
3184 kiblnd_complete(&wc);
3186 spin_lock_irqsave(&kiblnd_data.kib_sched_lock,
3190 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3197 set_current_state(TASK_INTERRUPTIBLE);
3198 add_wait_queue_exclusive(&kiblnd_data.kib_sched_waitq, &wait);
3199 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3204 remove_wait_queue(&kiblnd_data.kib_sched_waitq, &wait);
3205 set_current_state(TASK_RUNNING);
3206 spin_lock_irqsave(&kiblnd_data.kib_sched_lock, flags);
3209 spin_unlock_irqrestore(&kiblnd_data.kib_sched_lock, flags);
3211 kiblnd_thread_fini();