--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lnet/klnds/o2iblnd/o2iblnd_cb.c
+ *
+ * Author: Eric Barton <eric@bartonsoftware.com>
+ */
+
+#include "o2iblnd.h"
+
+static void
+kiblnd_tx_done(lnet_ni_t *ni, kib_tx_t *tx)
+{
+ lnet_msg_t *lntmsg[2];
+ kib_net_t *net = ni->ni_data;
+ int rc;
+ int i;
+
+ LASSERT(net != NULL);
+ LASSERT(!in_interrupt());
+ LASSERT(!tx->tx_queued); /* mustn't be queued for sending */
+ LASSERT(tx->tx_sending == 0); /* mustn't be awaiting sent callback */
+ LASSERT(!tx->tx_waiting); /* mustn't be awaiting peer response */
+ LASSERT(tx->tx_pool != NULL);
+
+ kiblnd_unmap_tx(ni, tx);
+
+ /* tx may have up to 2 lnet msgs to finalise */
+ lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
+ lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
+ rc = tx->tx_status;
+
+ if (tx->tx_conn != NULL) {
+ LASSERT(ni == tx->tx_conn->ibc_peer->ibp_ni);
+
+ kiblnd_conn_decref(tx->tx_conn);
+ tx->tx_conn = NULL;
+ }
+
+ tx->tx_nwrq = 0;
+ tx->tx_status = 0;
+
+ kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
+
+ /* delay finalize until my descs have been freed */
+ for (i = 0; i < 2; i++) {
+ if (lntmsg[i] == NULL)
+ continue;
+
+ lnet_finalize(ni, lntmsg[i], rc);
+ }
+}
+
+void
+kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
+{
+ kib_tx_t *tx;
+
+ while (!list_empty(txlist)) {
+ tx = list_entry(txlist->next, kib_tx_t, tx_list);
+
+ list_del(&tx->tx_list);
+ /* complete now */
+ tx->tx_waiting = 0;
+ tx->tx_status = status;
+ kiblnd_tx_done(ni, tx);
+ }
+}
+
+static kib_tx_t *
+kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
+{
+ kib_net_t *net = (kib_net_t *)ni->ni_data;
+ struct list_head *node;
+ kib_tx_t *tx;
+ kib_tx_poolset_t *tps;
+
+ tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
+ node = kiblnd_pool_alloc_node(&tps->tps_poolset);
+ if (node == NULL)
+ return NULL;
+ tx = container_of(node, kib_tx_t, tx_list);
+
+ LASSERT(tx->tx_nwrq == 0);
+ LASSERT(!tx->tx_queued);
+ LASSERT(tx->tx_sending == 0);
+ LASSERT(!tx->tx_waiting);
+ LASSERT(tx->tx_status == 0);
+ LASSERT(tx->tx_conn == NULL);
+ LASSERT(tx->tx_lntmsg[0] == NULL);
+ LASSERT(tx->tx_lntmsg[1] == NULL);
+ LASSERT(tx->tx_u.pmr == NULL);
+ LASSERT(tx->tx_nfrags == 0);
+
+ return tx;
+}
+
+static void
+kiblnd_drop_rx(kib_rx_t *rx)
+{
+ kib_conn_t *conn = rx->rx_conn;
+ struct kib_sched_info *sched = conn->ibc_sched;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+ LASSERT(conn->ibc_nrx > 0);
+ conn->ibc_nrx--;
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+
+ kiblnd_conn_decref(conn);
+}
+
+int
+kiblnd_post_rx(kib_rx_t *rx, int credit)
+{
+ kib_conn_t *conn = rx->rx_conn;
+ kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
+ struct ib_recv_wr *bad_wrq = NULL;
+ struct ib_mr *mr;
+ int rc;
+
+ LASSERT(net != NULL);
+ LASSERT(!in_interrupt());
+ LASSERT(credit == IBLND_POSTRX_NO_CREDIT ||
+ credit == IBLND_POSTRX_PEER_CREDIT ||
+ credit == IBLND_POSTRX_RSRVD_CREDIT);
+
+ mr = kiblnd_find_dma_mr(conn->ibc_hdev, rx->rx_msgaddr, IBLND_MSG_SIZE);
+ LASSERT(mr != NULL);
+
+ rx->rx_sge.lkey = mr->lkey;
+ rx->rx_sge.addr = rx->rx_msgaddr;
+ rx->rx_sge.length = IBLND_MSG_SIZE;
+
+ rx->rx_wrq.next = NULL;
+ rx->rx_wrq.sg_list = &rx->rx_sge;
+ rx->rx_wrq.num_sge = 1;
+ rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
+
+ LASSERT(conn->ibc_state >= IBLND_CONN_INIT);
+ LASSERT(rx->rx_nob >= 0); /* not posted */
+
+ if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
+ kiblnd_drop_rx(rx); /* No more posts for this rx */
+ return 0;
+ }
+
+ rx->rx_nob = -1; /* flag posted */
+
+ rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
+ if (rc != 0) {
+ CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
+ rx->rx_nob = 0;
+ }
+
+ if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
+ return rc;
+
+ if (rc != 0) {
+ kiblnd_close_conn(conn, rc);
+ kiblnd_drop_rx(rx); /* No more posts for this rx */
+ return rc;
+ }
+
+ if (credit == IBLND_POSTRX_NO_CREDIT)
+ return 0;
+
+ spin_lock(&conn->ibc_lock);
+ if (credit == IBLND_POSTRX_PEER_CREDIT)
+ conn->ibc_outstanding_credits++;
+ else
+ conn->ibc_reserved_credits++;
+ spin_unlock(&conn->ibc_lock);
+
+ kiblnd_check_sends(conn);
+ return 0;
+}
+
+static kib_tx_t *
+kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
+{
+ struct list_head *tmp;
+
+ list_for_each(tmp, &conn->ibc_active_txs) {
+ kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
+
+ LASSERT(!tx->tx_queued);
+ LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
+
+ if (tx->tx_cookie != cookie)
+ continue;
+
+ if (tx->tx_waiting &&
+ tx->tx_msg->ibm_type == txtype)
+ return tx;
+
+ CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
+ tx->tx_waiting ? "" : "NOT ",
+ tx->tx_msg->ibm_type, txtype);
+ }
+ return NULL;
+}
+
+static void
+kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
+{
+ kib_tx_t *tx;
+ lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
+ int idle;
+
+ spin_lock(&conn->ibc_lock);
+
+ tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
+ if (tx == NULL) {
+ spin_unlock(&conn->ibc_lock);
+
+ CWARN("Unmatched completion type %x cookie %#llx from %s\n",
+ txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ kiblnd_close_conn(conn, -EPROTO);
+ return;
+ }
+
+ if (tx->tx_status == 0) { /* success so far */
+ if (status < 0) { /* failed? */
+ tx->tx_status = status;
+ } else if (txtype == IBLND_MSG_GET_REQ) {
+ lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
+ }
+ }
+
+ tx->tx_waiting = 0;
+
+ idle = !tx->tx_queued && (tx->tx_sending == 0);
+ if (idle)
+ list_del(&tx->tx_list);
+
+ spin_unlock(&conn->ibc_lock);
+
+ if (idle)
+ kiblnd_tx_done(ni, tx);
+}
+
+static void
+kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
+{
+ lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
+ kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
+
+ if (tx == NULL) {
+ CERROR("Can't get tx for completion %x for %s\n",
+ type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ return;
+ }
+
+ tx->tx_msg->ibm_u.completion.ibcm_status = status;
+ tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
+ kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
+
+ kiblnd_queue_tx(tx, conn);
+}
+
+static void
+kiblnd_handle_rx(kib_rx_t *rx)
+{
+ kib_msg_t *msg = rx->rx_msg;
+ kib_conn_t *conn = rx->rx_conn;
+ lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
+ int credits = msg->ibm_credits;
+ kib_tx_t *tx;
+ int rc = 0;
+ int rc2;
+ int post_credit;
+
+ LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
+
+ CDEBUG(D_NET, "Received %x[%d] from %s\n",
+ msg->ibm_type, credits,
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+
+ if (credits != 0) {
+ /* Have I received credits that will let me send? */
+ spin_lock(&conn->ibc_lock);
+
+ if (conn->ibc_credits + credits >
+ IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
+ rc2 = conn->ibc_credits;
+ spin_unlock(&conn->ibc_lock);
+
+ CERROR("Bad credits from %s: %d + %d > %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid),
+ rc2, credits,
+ IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
+
+ kiblnd_close_conn(conn, -EPROTO);
+ kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
+ return;
+ }
+
+ conn->ibc_credits += credits;
+
+ /* This ensures the credit taken by NOOP can be returned */
+ if (msg->ibm_type == IBLND_MSG_NOOP &&
+ !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
+ conn->ibc_outstanding_credits++;
+
+ spin_unlock(&conn->ibc_lock);
+ kiblnd_check_sends(conn);
+ }
+
+ switch (msg->ibm_type) {
+ default:
+ CERROR("Bad IBLND message type %x from %s\n",
+ msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ post_credit = IBLND_POSTRX_NO_CREDIT;
+ rc = -EPROTO;
+ break;
+
+ case IBLND_MSG_NOOP:
+ if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
+ post_credit = IBLND_POSTRX_NO_CREDIT;
+ break;
+ }
+
+ if (credits != 0) /* credit already posted */
+ post_credit = IBLND_POSTRX_NO_CREDIT;
+ else /* a keepalive NOOP */
+ post_credit = IBLND_POSTRX_PEER_CREDIT;
+ break;
+
+ case IBLND_MSG_IMMEDIATE:
+ post_credit = IBLND_POSTRX_DONT_POST;
+ rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
+ msg->ibm_srcnid, rx, 0);
+ if (rc < 0) /* repost on error */
+ post_credit = IBLND_POSTRX_PEER_CREDIT;
+ break;
+
+ case IBLND_MSG_PUT_REQ:
+ post_credit = IBLND_POSTRX_DONT_POST;
+ rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
+ msg->ibm_srcnid, rx, 1);
+ if (rc < 0) /* repost on error */
+ post_credit = IBLND_POSTRX_PEER_CREDIT;
+ break;
+
+ case IBLND_MSG_PUT_NAK:
+ CWARN("PUT_NACK from %s\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ post_credit = IBLND_POSTRX_RSRVD_CREDIT;
+ kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
+ msg->ibm_u.completion.ibcm_status,
+ msg->ibm_u.completion.ibcm_cookie);
+ break;
+
+ case IBLND_MSG_PUT_ACK:
+ post_credit = IBLND_POSTRX_RSRVD_CREDIT;
+
+ spin_lock(&conn->ibc_lock);
+ tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
+ msg->ibm_u.putack.ibpam_src_cookie);
+ if (tx != NULL)
+ list_del(&tx->tx_list);
+ spin_unlock(&conn->ibc_lock);
+
+ if (tx == NULL) {
+ CERROR("Unmatched PUT_ACK from %s\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ rc = -EPROTO;
+ break;
+ }
+
+ LASSERT(tx->tx_waiting);
+ /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
+ * (a) I can overwrite tx_msg since my peer has received it!
+ * (b) tx_waiting set tells tx_complete() it's not done. */
+
+ tx->tx_nwrq = 0; /* overwrite PUT_REQ */
+
+ rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
+ kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
+ &msg->ibm_u.putack.ibpam_rd,
+ msg->ibm_u.putack.ibpam_dst_cookie);
+ if (rc2 < 0)
+ CERROR("Can't setup rdma for PUT to %s: %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
+
+ spin_lock(&conn->ibc_lock);
+ tx->tx_waiting = 0; /* clear waiting and queue atomically */
+ kiblnd_queue_tx_locked(tx, conn);
+ spin_unlock(&conn->ibc_lock);
+ break;
+
+ case IBLND_MSG_PUT_DONE:
+ post_credit = IBLND_POSTRX_PEER_CREDIT;
+ kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
+ msg->ibm_u.completion.ibcm_status,
+ msg->ibm_u.completion.ibcm_cookie);
+ break;
+
+ case IBLND_MSG_GET_REQ:
+ post_credit = IBLND_POSTRX_DONT_POST;
+ rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
+ msg->ibm_srcnid, rx, 1);
+ if (rc < 0) /* repost on error */
+ post_credit = IBLND_POSTRX_PEER_CREDIT;
+ break;
+
+ case IBLND_MSG_GET_DONE:
+ post_credit = IBLND_POSTRX_RSRVD_CREDIT;
+ kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
+ msg->ibm_u.completion.ibcm_status,
+ msg->ibm_u.completion.ibcm_cookie);
+ break;
+ }
+
+ if (rc < 0) /* protocol error */
+ kiblnd_close_conn(conn, rc);
+
+ if (post_credit != IBLND_POSTRX_DONT_POST)
+ kiblnd_post_rx(rx, post_credit);
+}
+
+static void
+kiblnd_rx_complete(kib_rx_t *rx, int status, int nob)
+{
+ kib_msg_t *msg = rx->rx_msg;
+ kib_conn_t *conn = rx->rx_conn;
+ lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
+ kib_net_t *net = ni->ni_data;
+ int rc;
+ int err = -EIO;
+
+ LASSERT(net != NULL);
+ LASSERT(rx->rx_nob < 0); /* was posted */
+ rx->rx_nob = 0; /* isn't now */
+
+ if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
+ goto ignore;
+
+ if (status != IB_WC_SUCCESS) {
+ CNETERR("Rx from %s failed: %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
+ goto failed;
+ }
+
+ LASSERT(nob >= 0);
+ rx->rx_nob = nob;
+
+ rc = kiblnd_unpack_msg(msg, rx->rx_nob);
+ if (rc != 0) {
+ CERROR("Error %d unpacking rx from %s\n",
+ rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ goto failed;
+ }
+
+ if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
+ msg->ibm_dstnid != ni->ni_nid ||
+ msg->ibm_srcstamp != conn->ibc_incarnation ||
+ msg->ibm_dststamp != net->ibn_incarnation) {
+ CERROR("Stale rx from %s\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ err = -ESTALE;
+ goto failed;
+ }
+
+ /* set time last known alive */
+ kiblnd_peer_alive(conn->ibc_peer);
+
+ /* racing with connection establishment/teardown! */
+
+ if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
+ rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
+ unsigned long flags;
+
+ write_lock_irqsave(g_lock, flags);
+ /* must check holding global lock to eliminate race */
+ if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
+ list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
+ write_unlock_irqrestore(g_lock, flags);
+ return;
+ }
+ write_unlock_irqrestore(g_lock, flags);
+ }
+ kiblnd_handle_rx(rx);
+ return;
+
+ failed:
+ CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
+ kiblnd_close_conn(conn, err);
+ ignore:
+ kiblnd_drop_rx(rx); /* Don't re-post rx. */
+}
+
+static struct page *
+kiblnd_kvaddr_to_page(unsigned long vaddr)
+{
+ struct page *page;
+
+ if (is_vmalloc_addr((void *)vaddr)) {
+ page = vmalloc_to_page((void *)vaddr);
+ LASSERT(page != NULL);
+ return page;
+ }
+#ifdef CONFIG_HIGHMEM
+ if (vaddr >= PKMAP_BASE &&
+ vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
+ /* No highmem pages only used for bulk (kiov) I/O */
+ CERROR("find page for address in highmem\n");
+ LBUG();
+ }
+#endif
+ page = virt_to_page(vaddr);
+ LASSERT(page != NULL);
+ return page;
+}
+
+static int
+kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
+{
+ kib_hca_dev_t *hdev;
+ __u64 *pages = tx->tx_pages;
+ kib_fmr_poolset_t *fps;
+ int npages;
+ int size;
+ int cpt;
+ int rc;
+ int i;
+
+ LASSERT(tx->tx_pool != NULL);
+ LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
+
+ hdev = tx->tx_pool->tpo_hdev;
+
+ for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
+ for (size = 0; size < rd->rd_frags[i].rf_nob;
+ size += hdev->ibh_page_size) {
+ pages[npages++] = (rd->rd_frags[i].rf_addr &
+ hdev->ibh_page_mask) + size;
+ }
+ }
+
+ cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
+
+ fps = net->ibn_fmr_ps[cpt];
+ rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->tx_u.fmr);
+ if (rc != 0) {
+ CERROR("Can't map %d pages: %d\n", npages, rc);
+ return rc;
+ }
+
+ /* If rd is not tx_rd, it's going to get sent to a peer, who will need
+ * the rkey */
+ rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.fmr.fmr_pfmr->fmr->rkey :
+ tx->tx_u.fmr.fmr_pfmr->fmr->lkey;
+ rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
+ rd->rd_frags[0].rf_nob = nob;
+ rd->rd_nfrags = 1;
+
+ return 0;
+}
+
+static int
+kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
+{
+ kib_hca_dev_t *hdev;
+ kib_pmr_poolset_t *pps;
+ __u64 iova;
+ int cpt;
+ int rc;
+
+ LASSERT(tx->tx_pool != NULL);
+ LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
+
+ hdev = tx->tx_pool->tpo_hdev;
+
+ iova = rd->rd_frags[0].rf_addr & ~hdev->ibh_page_mask;
+
+ cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
+
+ pps = net->ibn_pmr_ps[cpt];
+ rc = kiblnd_pmr_pool_map(pps, hdev, rd, &iova, &tx->tx_u.pmr);
+ if (rc != 0) {
+ CERROR("Failed to create MR by phybuf: %d\n", rc);
+ return rc;
+ }
+
+ /* If rd is not tx_rd, it's going to get sent to a peer, who will need
+ * the rkey */
+ rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.pmr->pmr_mr->rkey :
+ tx->tx_u.pmr->pmr_mr->lkey;
+ rd->rd_nfrags = 1;
+ rd->rd_frags[0].rf_addr = iova;
+ rd->rd_frags[0].rf_nob = nob;
+
+ return 0;
+}
+
+void
+kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
+{
+ kib_net_t *net = ni->ni_data;
+
+ LASSERT(net != NULL);
+
+ if (net->ibn_fmr_ps != NULL && tx->tx_u.fmr.fmr_pfmr != NULL) {
+ kiblnd_fmr_pool_unmap(&tx->tx_u.fmr, tx->tx_status);
+ tx->tx_u.fmr.fmr_pfmr = NULL;
+
+ } else if (net->ibn_pmr_ps != NULL && tx->tx_u.pmr != NULL) {
+ kiblnd_pmr_pool_unmap(tx->tx_u.pmr);
+ tx->tx_u.pmr = NULL;
+ }
+
+ if (tx->tx_nfrags != 0) {
+ kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
+ tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
+ tx->tx_nfrags = 0;
+ }
+}
+
+int
+kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
+ kib_rdma_desc_t *rd, int nfrags)
+{
+ kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
+ kib_net_t *net = ni->ni_data;
+ struct ib_mr *mr = NULL;
+ __u32 nob;
+ int i;
+
+ /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
+ * RDMA sink */
+ tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+ tx->tx_nfrags = nfrags;
+
+ rd->rd_nfrags =
+ kiblnd_dma_map_sg(hdev->ibh_ibdev,
+ tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
+
+ for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
+ rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
+ hdev->ibh_ibdev, &tx->tx_frags[i]);
+ rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
+ hdev->ibh_ibdev, &tx->tx_frags[i]);
+ nob += rd->rd_frags[i].rf_nob;
+ }
+
+ /* looking for pre-mapping MR */
+ mr = kiblnd_find_rd_dma_mr(hdev, rd);
+ if (mr != NULL) {
+ /* found pre-mapping MR */
+ rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
+ return 0;
+ }
+
+ if (net->ibn_fmr_ps != NULL)
+ return kiblnd_fmr_map_tx(net, tx, rd, nob);
+ else if (net->ibn_pmr_ps != NULL)
+ return kiblnd_pmr_map_tx(net, tx, rd, nob);
+
+ return -EINVAL;
+}
+
+
+static int
+kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
+ unsigned int niov, struct kvec *iov, int offset, int nob)
+{
+ kib_net_t *net = ni->ni_data;
+ struct page *page;
+ struct scatterlist *sg;
+ unsigned long vaddr;
+ int fragnob;
+ int page_offset;
+
+ LASSERT(nob > 0);
+ LASSERT(niov > 0);
+ LASSERT(net != NULL);
+
+ while (offset >= iov->iov_len) {
+ offset -= iov->iov_len;
+ niov--;
+ iov++;
+ LASSERT(niov > 0);
+ }
+
+ sg = tx->tx_frags;
+ do {
+ LASSERT(niov > 0);
+
+ vaddr = ((unsigned long)iov->iov_base) + offset;
+ page_offset = vaddr & (PAGE_SIZE - 1);
+ page = kiblnd_kvaddr_to_page(vaddr);
+ if (page == NULL) {
+ CERROR("Can't find page\n");
+ return -EFAULT;
+ }
+
+ fragnob = min((int)(iov->iov_len - offset), nob);
+ fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
+
+ sg_set_page(sg, page, fragnob, page_offset);
+ sg++;
+
+ if (offset + fragnob < iov->iov_len) {
+ offset += fragnob;
+ } else {
+ offset = 0;
+ iov++;
+ niov--;
+ }
+ nob -= fragnob;
+ } while (nob > 0);
+
+ return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
+}
+
+static int
+kiblnd_setup_rd_kiov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
+ int nkiov, lnet_kiov_t *kiov, int offset, int nob)
+{
+ kib_net_t *net = ni->ni_data;
+ struct scatterlist *sg;
+ int fragnob;
+
+ CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
+
+ LASSERT(nob > 0);
+ LASSERT(nkiov > 0);
+ LASSERT(net != NULL);
+
+ while (offset >= kiov->kiov_len) {
+ offset -= kiov->kiov_len;
+ nkiov--;
+ kiov++;
+ LASSERT(nkiov > 0);
+ }
+
+ sg = tx->tx_frags;
+ do {
+ LASSERT(nkiov > 0);
+
+ fragnob = min((int)(kiov->kiov_len - offset), nob);
+
+ sg_set_page(sg, kiov->kiov_page, fragnob,
+ kiov->kiov_offset + offset);
+ sg++;
+
+ offset = 0;
+ kiov++;
+ nkiov--;
+ nob -= fragnob;
+ } while (nob > 0);
+
+ return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
+}
+
+static int
+kiblnd_post_tx_locked(kib_conn_t *conn, kib_tx_t *tx, int credit)
+ __releases(conn->ibc_lock)
+ __acquires(conn->ibc_lock)
+{
+ kib_msg_t *msg = tx->tx_msg;
+ kib_peer_t *peer = conn->ibc_peer;
+ int ver = conn->ibc_version;
+ int rc;
+ int done;
+ struct ib_send_wr *bad_wrq;
+
+ LASSERT(tx->tx_queued);
+ /* We rely on this for QP sizing */
+ LASSERT(tx->tx_nwrq > 0);
+ LASSERT(tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
+
+ LASSERT(credit == 0 || credit == 1);
+ LASSERT(conn->ibc_outstanding_credits >= 0);
+ LASSERT(conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
+ LASSERT(conn->ibc_credits >= 0);
+ LASSERT(conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
+
+ if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
+ /* tx completions outstanding... */
+ CDEBUG(D_NET, "%s: posted enough\n",
+ libcfs_nid2str(peer->ibp_nid));
+ return -EAGAIN;
+ }
+
+ if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
+ CDEBUG(D_NET, "%s: no credits\n",
+ libcfs_nid2str(peer->ibp_nid));
+ return -EAGAIN;
+ }
+
+ if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
+ conn->ibc_credits == 1 && /* last credit reserved */
+ msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
+ CDEBUG(D_NET, "%s: not using last credit\n",
+ libcfs_nid2str(peer->ibp_nid));
+ return -EAGAIN;
+ }
+
+ /* NB don't drop ibc_lock before bumping tx_sending */
+ list_del(&tx->tx_list);
+ tx->tx_queued = 0;
+
+ if (msg->ibm_type == IBLND_MSG_NOOP &&
+ (!kiblnd_need_noop(conn) || /* redundant NOOP */
+ (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
+ conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
+ /* OK to drop when posted enough NOOPs, since
+ * kiblnd_check_sends will queue NOOP again when
+ * posted NOOPs complete */
+ spin_unlock(&conn->ibc_lock);
+ kiblnd_tx_done(peer->ibp_ni, tx);
+ spin_lock(&conn->ibc_lock);
+ CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
+ libcfs_nid2str(peer->ibp_nid),
+ conn->ibc_noops_posted);
+ return 0;
+ }
+
+ kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
+ peer->ibp_nid, conn->ibc_incarnation);
+
+ conn->ibc_credits -= credit;
+ conn->ibc_outstanding_credits = 0;
+ conn->ibc_nsends_posted++;
+ if (msg->ibm_type == IBLND_MSG_NOOP)
+ conn->ibc_noops_posted++;
+
+ /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
+ * PUT. If so, it was first queued here as a PUT_REQ, sent and
+ * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
+ * and then re-queued here. It's (just) possible that
+ * tx_sending is non-zero if we've not done the tx_complete()
+ * from the first send; hence the ++ rather than = below. */
+ tx->tx_sending++;
+ list_add(&tx->tx_list, &conn->ibc_active_txs);
+
+ /* I'm still holding ibc_lock! */
+ if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
+ rc = -ECONNABORTED;
+ } else if (tx->tx_pool->tpo_pool.po_failed ||
+ conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
+ /* close_conn will launch failover */
+ rc = -ENETDOWN;
+ } else {
+ rc = ib_post_send(conn->ibc_cmid->qp,
+ tx->tx_wrq, &bad_wrq);
+ }
+
+ conn->ibc_last_send = jiffies;
+
+ if (rc == 0)
+ return 0;
+
+ /* NB credits are transferred in the actual
+ * message, which can only be the last work item */
+ conn->ibc_credits += credit;
+ conn->ibc_outstanding_credits += msg->ibm_credits;
+ conn->ibc_nsends_posted--;
+ if (msg->ibm_type == IBLND_MSG_NOOP)
+ conn->ibc_noops_posted--;
+
+ tx->tx_status = rc;
+ tx->tx_waiting = 0;
+ tx->tx_sending--;
+
+ done = (tx->tx_sending == 0);
+ if (done)
+ list_del(&tx->tx_list);
+
+ spin_unlock(&conn->ibc_lock);
+
+ if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
+ CERROR("Error %d posting transmit to %s\n",
+ rc, libcfs_nid2str(peer->ibp_nid));
+ else
+ CDEBUG(D_NET, "Error %d posting transmit to %s\n",
+ rc, libcfs_nid2str(peer->ibp_nid));
+
+ kiblnd_close_conn(conn, rc);
+
+ if (done)
+ kiblnd_tx_done(peer->ibp_ni, tx);
+
+ spin_lock(&conn->ibc_lock);
+
+ return -EIO;
+}
+
+void
+kiblnd_check_sends(kib_conn_t *conn)
+{
+ int ver = conn->ibc_version;
+ lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
+ kib_tx_t *tx;
+
+ /* Don't send anything until after the connection is established */
+ if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
+ CDEBUG(D_NET, "%s too soon\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ return;
+ }
+
+ spin_lock(&conn->ibc_lock);
+
+ LASSERT(conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
+ LASSERT(!IBLND_OOB_CAPABLE(ver) ||
+ conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
+ LASSERT(conn->ibc_reserved_credits >= 0);
+
+ while (conn->ibc_reserved_credits > 0 &&
+ !list_empty(&conn->ibc_tx_queue_rsrvd)) {
+ tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
+ kib_tx_t, tx_list);
+ list_del(&tx->tx_list);
+ list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
+ conn->ibc_reserved_credits--;
+ }
+
+ if (kiblnd_need_noop(conn)) {
+ spin_unlock(&conn->ibc_lock);
+
+ tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
+ if (tx != NULL)
+ kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
+
+ spin_lock(&conn->ibc_lock);
+ if (tx != NULL)
+ kiblnd_queue_tx_locked(tx, conn);
+ }
+
+ kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */
+
+ for (;;) {
+ int credit;
+
+ if (!list_empty(&conn->ibc_tx_queue_nocred)) {
+ credit = 0;
+ tx = list_entry(conn->ibc_tx_queue_nocred.next,
+ kib_tx_t, tx_list);
+ } else if (!list_empty(&conn->ibc_tx_noops)) {
+ LASSERT(!IBLND_OOB_CAPABLE(ver));
+ credit = 1;
+ tx = list_entry(conn->ibc_tx_noops.next,
+ kib_tx_t, tx_list);
+ } else if (!list_empty(&conn->ibc_tx_queue)) {
+ credit = 1;
+ tx = list_entry(conn->ibc_tx_queue.next,
+ kib_tx_t, tx_list);
+ } else
+ break;
+
+ if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
+ break;
+ }
+
+ spin_unlock(&conn->ibc_lock);
+
+ kiblnd_conn_decref(conn); /* ...until here */
+}
+
+static void
+kiblnd_tx_complete(kib_tx_t *tx, int status)
+{
+ int failed = (status != IB_WC_SUCCESS);
+ kib_conn_t *conn = tx->tx_conn;
+ int idle;
+
+ LASSERT(tx->tx_sending > 0);
+
+ if (failed) {
+ if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
+ CNETERR("Tx -> %s cookie %#llx sending %d waiting %d: failed %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid),
+ tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
+ status);
+
+ kiblnd_close_conn(conn, -EIO);
+ } else {
+ kiblnd_peer_alive(conn->ibc_peer);
+ }
+
+ spin_lock(&conn->ibc_lock);
+
+ /* I could be racing with rdma completion. Whoever makes 'tx' idle
+ * gets to free it, which also drops its ref on 'conn'. */
+
+ tx->tx_sending--;
+ conn->ibc_nsends_posted--;
+ if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
+ conn->ibc_noops_posted--;
+
+ if (failed) {
+ tx->tx_waiting = 0; /* don't wait for peer */
+ tx->tx_status = -EIO;
+ }
+
+ idle = (tx->tx_sending == 0) && /* This is the final callback */
+ !tx->tx_waiting && /* Not waiting for peer */
+ !tx->tx_queued; /* Not re-queued (PUT_DONE) */
+ if (idle)
+ list_del(&tx->tx_list);
+
+ kiblnd_conn_addref(conn); /* 1 ref for me.... */
+
+ spin_unlock(&conn->ibc_lock);
+
+ if (idle)
+ kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
+
+ kiblnd_check_sends(conn);
+
+ kiblnd_conn_decref(conn); /* ...until here */
+}
+
+void
+kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
+{
+ kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
+ struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
+ struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
+ int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
+ struct ib_mr *mr;
+
+ LASSERT(tx->tx_nwrq >= 0);
+ LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
+ LASSERT(nob <= IBLND_MSG_SIZE);
+
+ kiblnd_init_msg(tx->tx_msg, type, body_nob);
+
+ mr = kiblnd_find_dma_mr(hdev, tx->tx_msgaddr, nob);
+ LASSERT(mr != NULL);
+
+ sge->lkey = mr->lkey;
+ sge->addr = tx->tx_msgaddr;
+ sge->length = nob;
+
+ memset(wrq, 0, sizeof(*wrq));
+
+ wrq->next = NULL;
+ wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
+ wrq->sg_list = sge;
+ wrq->num_sge = 1;
+ wrq->opcode = IB_WR_SEND;
+ wrq->send_flags = IB_SEND_SIGNALED;
+
+ tx->tx_nwrq++;
+}
+
+int
+kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
+ int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
+{
+ kib_msg_t *ibmsg = tx->tx_msg;
+ kib_rdma_desc_t *srcrd = tx->tx_rd;
+ struct ib_sge *sge = &tx->tx_sge[0];
+ struct ib_send_wr *wrq = &tx->tx_wrq[0];
+ int rc = resid;
+ int srcidx;
+ int dstidx;
+ int wrknob;
+
+ LASSERT(!in_interrupt());
+ LASSERT(tx->tx_nwrq == 0);
+ LASSERT(type == IBLND_MSG_GET_DONE ||
+ type == IBLND_MSG_PUT_DONE);
+
+ srcidx = dstidx = 0;
+
+ while (resid > 0) {
+ if (srcidx >= srcrd->rd_nfrags) {
+ CERROR("Src buffer exhausted: %d frags\n", srcidx);
+ rc = -EPROTO;
+ break;
+ }
+
+ if (dstidx == dstrd->rd_nfrags) {
+ CERROR("Dst buffer exhausted: %d frags\n", dstidx);
+ rc = -EPROTO;
+ break;
+ }
+
+ if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
+ CERROR("RDMA too fragmented for %s (%d): %d/%d src %d/%d dst frags\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid),
+ IBLND_RDMA_FRAGS(conn->ibc_version),
+ srcidx, srcrd->rd_nfrags,
+ dstidx, dstrd->rd_nfrags);
+ rc = -EMSGSIZE;
+ break;
+ }
+
+ wrknob = min(min(kiblnd_rd_frag_size(srcrd, srcidx),
+ kiblnd_rd_frag_size(dstrd, dstidx)),
+ (__u32) resid);
+
+ sge = &tx->tx_sge[tx->tx_nwrq];
+ sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
+ sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
+ sge->length = wrknob;
+
+ wrq = &tx->tx_wrq[tx->tx_nwrq];
+
+ wrq->next = wrq + 1;
+ wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
+ wrq->sg_list = sge;
+ wrq->num_sge = 1;
+ wrq->opcode = IB_WR_RDMA_WRITE;
+ wrq->send_flags = 0;
+
+ wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
+ wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
+
+ srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
+ dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
+
+ resid -= wrknob;
+
+ tx->tx_nwrq++;
+ wrq++;
+ sge++;
+ }
+
+ if (rc < 0) /* no RDMA if completing with failure */
+ tx->tx_nwrq = 0;
+
+ ibmsg->ibm_u.completion.ibcm_status = rc;
+ ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
+ kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
+ type, sizeof(kib_completion_msg_t));
+
+ return rc;
+}
+
+void
+kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
+{
+ struct list_head *q;
+
+ LASSERT(tx->tx_nwrq > 0); /* work items set up */
+ LASSERT(!tx->tx_queued); /* not queued for sending already */
+ LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
+
+ tx->tx_queued = 1;
+ tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
+
+ if (tx->tx_conn == NULL) {
+ kiblnd_conn_addref(conn);
+ tx->tx_conn = conn;
+ LASSERT(tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
+ } else {
+ /* PUT_DONE first attached to conn as a PUT_REQ */
+ LASSERT(tx->tx_conn == conn);
+ LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
+ }
+
+ switch (tx->tx_msg->ibm_type) {
+ default:
+ LBUG();
+
+ case IBLND_MSG_PUT_REQ:
+ case IBLND_MSG_GET_REQ:
+ q = &conn->ibc_tx_queue_rsrvd;
+ break;
+
+ case IBLND_MSG_PUT_NAK:
+ case IBLND_MSG_PUT_ACK:
+ case IBLND_MSG_PUT_DONE:
+ case IBLND_MSG_GET_DONE:
+ q = &conn->ibc_tx_queue_nocred;
+ break;
+
+ case IBLND_MSG_NOOP:
+ if (IBLND_OOB_CAPABLE(conn->ibc_version))
+ q = &conn->ibc_tx_queue_nocred;
+ else
+ q = &conn->ibc_tx_noops;
+ break;
+
+ case IBLND_MSG_IMMEDIATE:
+ q = &conn->ibc_tx_queue;
+ break;
+ }
+
+ list_add_tail(&tx->tx_list, q);
+}
+
+void
+kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn)
+{
+ spin_lock(&conn->ibc_lock);
+ kiblnd_queue_tx_locked(tx, conn);
+ spin_unlock(&conn->ibc_lock);
+
+ kiblnd_check_sends(conn);
+}
+
+static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
+ struct sockaddr_in *srcaddr,
+ struct sockaddr_in *dstaddr,
+ int timeout_ms)
+{
+ unsigned short port;
+ int rc;
+
+ /* allow the port to be reused */
+ rc = rdma_set_reuseaddr(cmid, 1);
+ if (rc != 0) {
+ CERROR("Unable to set reuse on cmid: %d\n", rc);
+ return rc;
+ }
+
+ /* look for a free privileged port */
+ for (port = PROT_SOCK-1; port > 0; port--) {
+ srcaddr->sin_port = htons(port);
+ rc = rdma_resolve_addr(cmid,
+ (struct sockaddr *)srcaddr,
+ (struct sockaddr *)dstaddr,
+ timeout_ms);
+ if (rc == 0) {
+ CDEBUG(D_NET, "bound to port %hu\n", port);
+ return 0;
+ } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
+ CDEBUG(D_NET, "bind to port %hu failed: %d\n",
+ port, rc);
+ } else {
+ return rc;
+ }
+ }
+
+ CERROR("Failed to bind to a free privileged port\n");
+ return rc;
+}
+
+static void
+kiblnd_connect_peer(kib_peer_t *peer)
+{
+ struct rdma_cm_id *cmid;
+ kib_dev_t *dev;
+ kib_net_t *net = peer->ibp_ni->ni_data;
+ struct sockaddr_in srcaddr;
+ struct sockaddr_in dstaddr;
+ int rc;
+
+ LASSERT(net != NULL);
+ LASSERT(peer->ibp_connecting > 0);
+
+ cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
+ IB_QPT_RC);
+
+ if (IS_ERR(cmid)) {
+ CERROR("Can't create CMID for %s: %ld\n",
+ libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
+ rc = PTR_ERR(cmid);
+ goto failed;
+ }
+
+ dev = net->ibn_dev;
+ memset(&srcaddr, 0, sizeof(srcaddr));
+ srcaddr.sin_family = AF_INET;
+ srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
+
+ memset(&dstaddr, 0, sizeof(dstaddr));
+ dstaddr.sin_family = AF_INET;
+ dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
+ dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
+
+ kiblnd_peer_addref(peer); /* cmid's ref */
+
+ if (*kiblnd_tunables.kib_use_priv_port) {
+ rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
+ *kiblnd_tunables.kib_timeout * 1000);
+ } else {
+ rc = rdma_resolve_addr(cmid,
+ (struct sockaddr *)&srcaddr,
+ (struct sockaddr *)&dstaddr,
+ *kiblnd_tunables.kib_timeout * 1000);
+ }
+ if (rc != 0) {
+ /* Can't initiate address resolution: */
+ CERROR("Can't resolve addr for %s: %d\n",
+ libcfs_nid2str(peer->ibp_nid), rc);
+ goto failed2;
+ }
+
+ LASSERT(cmid->device != NULL);
+ CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
+ libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
+ &dev->ibd_ifip, cmid->device->name);
+
+ return;
+
+ failed2:
+ kiblnd_peer_decref(peer); /* cmid's ref */
+ rdma_destroy_id(cmid);
+ failed:
+ kiblnd_peer_connect_failed(peer, 1, rc);
+}
+
+void
+kiblnd_launch_tx(lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
+{
+ kib_peer_t *peer;
+ kib_peer_t *peer2;
+ kib_conn_t *conn;
+ rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
+ unsigned long flags;
+ int rc;
+
+ /* If I get here, I've committed to send, so I complete the tx with
+ * failure on any problems */
+
+ LASSERT(tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
+ LASSERT(tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
+
+ /* First time, just use a read lock since I expect to find my peer
+ * connected */
+ read_lock_irqsave(g_lock, flags);
+
+ peer = kiblnd_find_peer_locked(nid);
+ if (peer != NULL && !list_empty(&peer->ibp_conns)) {
+ /* Found a peer with an established connection */
+ conn = kiblnd_get_conn_locked(peer);
+ kiblnd_conn_addref(conn); /* 1 ref for me... */
+
+ read_unlock_irqrestore(g_lock, flags);
+
+ if (tx != NULL)
+ kiblnd_queue_tx(tx, conn);
+ kiblnd_conn_decref(conn); /* ...to here */
+ return;
+ }
+
+ read_unlock(g_lock);
+ /* Re-try with a write lock */
+ write_lock(g_lock);
+
+ peer = kiblnd_find_peer_locked(nid);
+ if (peer != NULL) {
+ if (list_empty(&peer->ibp_conns)) {
+ /* found a peer, but it's still connecting... */
+ LASSERT(peer->ibp_connecting != 0 ||
+ peer->ibp_accepting != 0);
+ if (tx != NULL)
+ list_add_tail(&tx->tx_list,
+ &peer->ibp_tx_queue);
+ write_unlock_irqrestore(g_lock, flags);
+ } else {
+ conn = kiblnd_get_conn_locked(peer);
+ kiblnd_conn_addref(conn); /* 1 ref for me... */
+
+ write_unlock_irqrestore(g_lock, flags);
+
+ if (tx != NULL)
+ kiblnd_queue_tx(tx, conn);
+ kiblnd_conn_decref(conn); /* ...to here */
+ }
+ return;
+ }
+
+ write_unlock_irqrestore(g_lock, flags);
+
+ /* Allocate a peer ready to add to the peer table and retry */
+ rc = kiblnd_create_peer(ni, &peer, nid);
+ if (rc != 0) {
+ CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
+ if (tx != NULL) {
+ tx->tx_status = -EHOSTUNREACH;
+ tx->tx_waiting = 0;
+ kiblnd_tx_done(ni, tx);
+ }
+ return;
+ }
+
+ write_lock_irqsave(g_lock, flags);
+
+ peer2 = kiblnd_find_peer_locked(nid);
+ if (peer2 != NULL) {
+ if (list_empty(&peer2->ibp_conns)) {
+ /* found a peer, but it's still connecting... */
+ LASSERT(peer2->ibp_connecting != 0 ||
+ peer2->ibp_accepting != 0);
+ if (tx != NULL)
+ list_add_tail(&tx->tx_list,
+ &peer2->ibp_tx_queue);
+ write_unlock_irqrestore(g_lock, flags);
+ } else {
+ conn = kiblnd_get_conn_locked(peer2);
+ kiblnd_conn_addref(conn); /* 1 ref for me... */
+
+ write_unlock_irqrestore(g_lock, flags);
+
+ if (tx != NULL)
+ kiblnd_queue_tx(tx, conn);
+ kiblnd_conn_decref(conn); /* ...to here */
+ }
+
+ kiblnd_peer_decref(peer);
+ return;
+ }
+
+ /* Brand new peer */
+ LASSERT(peer->ibp_connecting == 0);
+ peer->ibp_connecting = 1;
+
+ /* always called with a ref on ni, which prevents ni being shutdown */
+ LASSERT(((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
+
+ if (tx != NULL)
+ list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
+
+ kiblnd_peer_addref(peer);
+ list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
+
+ write_unlock_irqrestore(g_lock, flags);
+
+ kiblnd_connect_peer(peer);
+ kiblnd_peer_decref(peer);
+}
+
+int
+kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
+{
+ lnet_hdr_t *hdr = &lntmsg->msg_hdr;
+ int type = lntmsg->msg_type;
+ lnet_process_id_t target = lntmsg->msg_target;
+ int target_is_router = lntmsg->msg_target_is_router;
+ int routing = lntmsg->msg_routing;
+ unsigned int payload_niov = lntmsg->msg_niov;
+ struct kvec *payload_iov = lntmsg->msg_iov;
+ lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
+ unsigned int payload_offset = lntmsg->msg_offset;
+ unsigned int payload_nob = lntmsg->msg_len;
+ kib_msg_t *ibmsg;
+ kib_tx_t *tx;
+ int nob;
+ int rc;
+
+ /* NB 'private' is different depending on what we're sending.... */
+
+ CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
+ payload_nob, payload_niov, libcfs_id2str(target));
+
+ LASSERT(payload_nob == 0 || payload_niov > 0);
+ LASSERT(payload_niov <= LNET_MAX_IOV);
+
+ /* Thread context */
+ LASSERT(!in_interrupt());
+ /* payload is either all vaddrs or all pages */
+ LASSERT(!(payload_kiov != NULL && payload_iov != NULL));
+
+ switch (type) {
+ default:
+ LBUG();
+ return -EIO;
+
+ case LNET_MSG_ACK:
+ LASSERT(payload_nob == 0);
+ break;
+
+ case LNET_MSG_GET:
+ if (routing || target_is_router)
+ break; /* send IMMEDIATE */
+
+ /* is the REPLY message too small for RDMA? */
+ nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
+ if (nob <= IBLND_MSG_SIZE)
+ break; /* send IMMEDIATE */
+
+ tx = kiblnd_get_idle_tx(ni, target.nid);
+ if (tx == NULL) {
+ CERROR("Can't allocate txd for GET to %s\n",
+ libcfs_nid2str(target.nid));
+ return -ENOMEM;
+ }
+
+ ibmsg = tx->tx_msg;
+
+ if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
+ rc = kiblnd_setup_rd_iov(ni, tx,
+ &ibmsg->ibm_u.get.ibgm_rd,
+ lntmsg->msg_md->md_niov,
+ lntmsg->msg_md->md_iov.iov,
+ 0, lntmsg->msg_md->md_length);
+ else
+ rc = kiblnd_setup_rd_kiov(ni, tx,
+ &ibmsg->ibm_u.get.ibgm_rd,
+ lntmsg->msg_md->md_niov,
+ lntmsg->msg_md->md_iov.kiov,
+ 0, lntmsg->msg_md->md_length);
+ if (rc != 0) {
+ CERROR("Can't setup GET sink for %s: %d\n",
+ libcfs_nid2str(target.nid), rc);
+ kiblnd_tx_done(ni, tx);
+ return -EIO;
+ }
+
+ nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
+ ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
+ ibmsg->ibm_u.get.ibgm_hdr = *hdr;
+
+ kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
+
+ tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
+ if (tx->tx_lntmsg[1] == NULL) {
+ CERROR("Can't create reply for GET -> %s\n",
+ libcfs_nid2str(target.nid));
+ kiblnd_tx_done(ni, tx);
+ return -EIO;
+ }
+
+ tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
+ tx->tx_waiting = 1; /* waiting for GET_DONE */
+ kiblnd_launch_tx(ni, tx, target.nid);
+ return 0;
+
+ case LNET_MSG_REPLY:
+ case LNET_MSG_PUT:
+ /* Is the payload small enough not to need RDMA? */
+ nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
+ if (nob <= IBLND_MSG_SIZE)
+ break; /* send IMMEDIATE */
+
+ tx = kiblnd_get_idle_tx(ni, target.nid);
+ if (tx == NULL) {
+ CERROR("Can't allocate %s txd for %s\n",
+ type == LNET_MSG_PUT ? "PUT" : "REPLY",
+ libcfs_nid2str(target.nid));
+ return -ENOMEM;
+ }
+
+ if (payload_kiov == NULL)
+ rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
+ payload_niov, payload_iov,
+ payload_offset, payload_nob);
+ else
+ rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
+ payload_niov, payload_kiov,
+ payload_offset, payload_nob);
+ if (rc != 0) {
+ CERROR("Can't setup PUT src for %s: %d\n",
+ libcfs_nid2str(target.nid), rc);
+ kiblnd_tx_done(ni, tx);
+ return -EIO;
+ }
+
+ ibmsg = tx->tx_msg;
+ ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
+ ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
+ kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
+
+ tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
+ tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
+ kiblnd_launch_tx(ni, tx, target.nid);
+ return 0;
+ }
+
+ /* send IMMEDIATE */
+
+ LASSERT(offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
+ <= IBLND_MSG_SIZE);
+
+ tx = kiblnd_get_idle_tx(ni, target.nid);
+ if (tx == NULL) {
+ CERROR("Can't send %d to %s: tx descs exhausted\n",
+ type, libcfs_nid2str(target.nid));
+ return -ENOMEM;
+ }
+
+ ibmsg = tx->tx_msg;
+ ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
+
+ if (payload_kiov != NULL)
+ lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
+ offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
+ payload_niov, payload_kiov,
+ payload_offset, payload_nob);
+ else
+ lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
+ offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
+ payload_niov, payload_iov,
+ payload_offset, payload_nob);
+
+ nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
+ kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
+
+ tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
+ kiblnd_launch_tx(ni, tx, target.nid);
+ return 0;
+}
+
+static void
+kiblnd_reply(lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
+{
+ lnet_process_id_t target = lntmsg->msg_target;
+ unsigned int niov = lntmsg->msg_niov;
+ struct kvec *iov = lntmsg->msg_iov;
+ lnet_kiov_t *kiov = lntmsg->msg_kiov;
+ unsigned int offset = lntmsg->msg_offset;
+ unsigned int nob = lntmsg->msg_len;
+ kib_tx_t *tx;
+ int rc;
+
+ tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
+ if (tx == NULL) {
+ CERROR("Can't get tx for REPLY to %s\n",
+ libcfs_nid2str(target.nid));
+ goto failed_0;
+ }
+
+ if (nob == 0)
+ rc = 0;
+ else if (kiov == NULL)
+ rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
+ niov, iov, offset, nob);
+ else
+ rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
+ niov, kiov, offset, nob);
+
+ if (rc != 0) {
+ CERROR("Can't setup GET src for %s: %d\n",
+ libcfs_nid2str(target.nid), rc);
+ goto failed_1;
+ }
+
+ rc = kiblnd_init_rdma(rx->rx_conn, tx,
+ IBLND_MSG_GET_DONE, nob,
+ &rx->rx_msg->ibm_u.get.ibgm_rd,
+ rx->rx_msg->ibm_u.get.ibgm_cookie);
+ if (rc < 0) {
+ CERROR("Can't setup rdma for GET from %s: %d\n",
+ libcfs_nid2str(target.nid), rc);
+ goto failed_1;
+ }
+
+ if (nob == 0) {
+ /* No RDMA: local completion may happen now! */
+ lnet_finalize(ni, lntmsg, 0);
+ } else {
+ /* RDMA: lnet_finalize(lntmsg) when it
+ * completes */
+ tx->tx_lntmsg[0] = lntmsg;
+ }
+
+ kiblnd_queue_tx(tx, rx->rx_conn);
+ return;
+
+ failed_1:
+ kiblnd_tx_done(ni, tx);
+ failed_0:
+ lnet_finalize(ni, lntmsg, -EIO);
+}
+
+int
+kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
+ unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
+ unsigned int offset, unsigned int mlen, unsigned int rlen)
+{
+ kib_rx_t *rx = private;
+ kib_msg_t *rxmsg = rx->rx_msg;
+ kib_conn_t *conn = rx->rx_conn;
+ kib_tx_t *tx;
+ kib_msg_t *txmsg;
+ int nob;
+ int post_credit = IBLND_POSTRX_PEER_CREDIT;
+ int rc = 0;
+
+ LASSERT(mlen <= rlen);
+ LASSERT(!in_interrupt());
+ /* Either all pages or all vaddrs */
+ LASSERT(!(kiov != NULL && iov != NULL));
+
+ switch (rxmsg->ibm_type) {
+ default:
+ LBUG();
+
+ case IBLND_MSG_IMMEDIATE:
+ nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
+ if (nob > rx->rx_nob) {
+ CERROR("Immediate message from %s too big: %d(%d)\n",
+ libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
+ nob, rx->rx_nob);
+ rc = -EPROTO;
+ break;
+ }
+
+ if (kiov != NULL)
+ lnet_copy_flat2kiov(niov, kiov, offset,
+ IBLND_MSG_SIZE, rxmsg,
+ offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
+ mlen);
+ else
+ lnet_copy_flat2iov(niov, iov, offset,
+ IBLND_MSG_SIZE, rxmsg,
+ offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
+ mlen);
+ lnet_finalize(ni, lntmsg, 0);
+ break;
+
+ case IBLND_MSG_PUT_REQ:
+ if (mlen == 0) {
+ lnet_finalize(ni, lntmsg, 0);
+ kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
+ rxmsg->ibm_u.putreq.ibprm_cookie);
+ break;
+ }
+
+ tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
+ if (tx == NULL) {
+ CERROR("Can't allocate tx for %s\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ /* Not replying will break the connection */
+ rc = -ENOMEM;
+ break;
+ }
+
+ txmsg = tx->tx_msg;
+ if (kiov == NULL)
+ rc = kiblnd_setup_rd_iov(ni, tx,
+ &txmsg->ibm_u.putack.ibpam_rd,
+ niov, iov, offset, mlen);
+ else
+ rc = kiblnd_setup_rd_kiov(ni, tx,
+ &txmsg->ibm_u.putack.ibpam_rd,
+ niov, kiov, offset, mlen);
+ if (rc != 0) {
+ CERROR("Can't setup PUT sink for %s: %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
+ kiblnd_tx_done(ni, tx);
+ /* tell peer it's over */
+ kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
+ rxmsg->ibm_u.putreq.ibprm_cookie);
+ break;
+ }
+
+ nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
+ txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
+ txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
+
+ kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
+
+ tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
+ tx->tx_waiting = 1; /* waiting for PUT_DONE */
+ kiblnd_queue_tx(tx, conn);
+
+ /* reposted buffer reserved for PUT_DONE */
+ post_credit = IBLND_POSTRX_NO_CREDIT;
+ break;
+
+ case IBLND_MSG_GET_REQ:
+ if (lntmsg != NULL) {
+ /* Optimized GET; RDMA lntmsg's payload */
+ kiblnd_reply(ni, rx, lntmsg);
+ } else {
+ /* GET didn't match anything */
+ kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
+ -ENODATA,
+ rxmsg->ibm_u.get.ibgm_cookie);
+ }
+ break;
+ }
+
+ kiblnd_post_rx(rx, post_credit);
+ return rc;
+}
+
+int
+kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
+{
+ struct task_struct *task = kthread_run(fn, arg, "%s", name);
+
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+
+ atomic_inc(&kiblnd_data.kib_nthreads);
+ return 0;
+}
+
+static void
+kiblnd_thread_fini(void)
+{
+ atomic_dec(&kiblnd_data.kib_nthreads);
+}
+
+void
+kiblnd_peer_alive(kib_peer_t *peer)
+{
+ /* This is racy, but everyone's only writing cfs_time_current() */
+ peer->ibp_last_alive = cfs_time_current();
+ mb();
+}
+
+static void
+kiblnd_peer_notify(kib_peer_t *peer)
+{
+ int error = 0;
+ unsigned long last_alive = 0;
+ unsigned long flags;
+
+ read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ if (list_empty(&peer->ibp_conns) &&
+ peer->ibp_accepting == 0 &&
+ peer->ibp_connecting == 0 &&
+ peer->ibp_error != 0) {
+ error = peer->ibp_error;
+ peer->ibp_error = 0;
+
+ last_alive = peer->ibp_last_alive;
+ }
+
+ read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ if (error != 0)
+ lnet_notify(peer->ibp_ni,
+ peer->ibp_nid, 0, last_alive);
+}
+
+void
+kiblnd_close_conn_locked(kib_conn_t *conn, int error)
+{
+ /* This just does the immediate housekeeping. 'error' is zero for a
+ * normal shutdown which can happen only after the connection has been
+ * established. If the connection is established, schedule the
+ * connection to be finished off by the connd. Otherwise the connd is
+ * already dealing with it (either to set it up or tear it down).
+ * Caller holds kib_global_lock exclusively in irq context */
+ kib_peer_t *peer = conn->ibc_peer;
+ kib_dev_t *dev;
+ unsigned long flags;
+
+ LASSERT(error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
+
+ if (error != 0 && conn->ibc_comms_error == 0)
+ conn->ibc_comms_error = error;
+
+ if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
+ return; /* already being handled */
+
+ if (error == 0 &&
+ list_empty(&conn->ibc_tx_noops) &&
+ list_empty(&conn->ibc_tx_queue) &&
+ list_empty(&conn->ibc_tx_queue_rsrvd) &&
+ list_empty(&conn->ibc_tx_queue_nocred) &&
+ list_empty(&conn->ibc_active_txs)) {
+ CDEBUG(D_NET, "closing conn to %s\n",
+ libcfs_nid2str(peer->ibp_nid));
+ } else {
+ CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
+ libcfs_nid2str(peer->ibp_nid), error,
+ list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
+ list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
+ list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
+ list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
+ list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
+ }
+
+ dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
+ list_del(&conn->ibc_list);
+ /* connd (see below) takes over ibc_list's ref */
+
+ if (list_empty(&peer->ibp_conns) && /* no more conns */
+ kiblnd_peer_active(peer)) { /* still in peer table */
+ kiblnd_unlink_peer_locked(peer);
+
+ /* set/clear error on last conn */
+ peer->ibp_error = conn->ibc_comms_error;
+ }
+
+ kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
+
+ if (error != 0 &&
+ kiblnd_dev_can_failover(dev)) {
+ list_add_tail(&dev->ibd_fail_list,
+ &kiblnd_data.kib_failed_devs);
+ wake_up(&kiblnd_data.kib_failover_waitq);
+ }
+
+ spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
+
+ list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
+ wake_up(&kiblnd_data.kib_connd_waitq);
+
+ spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
+}
+
+void
+kiblnd_close_conn(kib_conn_t *conn, int error)
+{
+ unsigned long flags;
+
+ write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ kiblnd_close_conn_locked(conn, error);
+
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+}
+
+static void
+kiblnd_handle_early_rxs(kib_conn_t *conn)
+{
+ unsigned long flags;
+ kib_rx_t *rx;
+ kib_rx_t *tmp;
+
+ LASSERT(!in_interrupt());
+ LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
+
+ write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+ list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
+ list_del(&rx->rx_list);
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ kiblnd_handle_rx(rx);
+
+ write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+ }
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+}
+
+static void
+kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
+{
+ LIST_HEAD(zombies);
+ struct list_head *tmp;
+ struct list_head *nxt;
+ kib_tx_t *tx;
+
+ spin_lock(&conn->ibc_lock);
+
+ list_for_each_safe(tmp, nxt, txs) {
+ tx = list_entry(tmp, kib_tx_t, tx_list);
+
+ if (txs == &conn->ibc_active_txs) {
+ LASSERT(!tx->tx_queued);
+ LASSERT(tx->tx_waiting ||
+ tx->tx_sending != 0);
+ } else {
+ LASSERT(tx->tx_queued);
+ }
+
+ tx->tx_status = -ECONNABORTED;
+ tx->tx_waiting = 0;
+
+ if (tx->tx_sending == 0) {
+ tx->tx_queued = 0;
+ list_del(&tx->tx_list);
+ list_add(&tx->tx_list, &zombies);
+ }
+ }
+
+ spin_unlock(&conn->ibc_lock);
+
+ kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
+}
+
+static void
+kiblnd_finalise_conn(kib_conn_t *conn)
+{
+ LASSERT(!in_interrupt());
+ LASSERT(conn->ibc_state > IBLND_CONN_INIT);
+
+ kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
+
+ /* abort_receives moves QP state to IB_QPS_ERR. This is only required
+ * for connections that didn't get as far as being connected, because
+ * rdma_disconnect() does this for free. */
+ kiblnd_abort_receives(conn);
+
+ /* Complete all tx descs not waiting for sends to complete.
+ * NB we should be safe from RDMA now that the QP has changed state */
+
+ kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
+ kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
+ kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
+ kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
+ kiblnd_abort_txs(conn, &conn->ibc_active_txs);
+
+ kiblnd_handle_early_rxs(conn);
+}
+
+void
+kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
+{
+ LIST_HEAD(zombies);
+ unsigned long flags;
+
+ LASSERT(error != 0);
+ LASSERT(!in_interrupt());
+
+ write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ if (active) {
+ LASSERT(peer->ibp_connecting > 0);
+ peer->ibp_connecting--;
+ } else {
+ LASSERT(peer->ibp_accepting > 0);
+ peer->ibp_accepting--;
+ }
+
+ if (peer->ibp_connecting != 0 ||
+ peer->ibp_accepting != 0) {
+ /* another connection attempt under way... */
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
+ flags);
+ return;
+ }
+
+ if (list_empty(&peer->ibp_conns)) {
+ /* Take peer's blocked transmits to complete with error */
+ list_add(&zombies, &peer->ibp_tx_queue);
+ list_del_init(&peer->ibp_tx_queue);
+
+ if (kiblnd_peer_active(peer))
+ kiblnd_unlink_peer_locked(peer);
+
+ peer->ibp_error = error;
+ } else {
+ /* Can't have blocked transmits if there are connections */
+ LASSERT(list_empty(&peer->ibp_tx_queue));
+ }
+
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ kiblnd_peer_notify(peer);
+
+ if (list_empty(&zombies))
+ return;
+
+ CNETERR("Deleting messages for %s: connection failed\n",
+ libcfs_nid2str(peer->ibp_nid));
+
+ kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
+}
+
+void
+kiblnd_connreq_done(kib_conn_t *conn, int status)
+{
+ kib_peer_t *peer = conn->ibc_peer;
+ kib_tx_t *tx;
+ kib_tx_t *tmp;
+ struct list_head txs;
+ unsigned long flags;
+ int active;
+
+ active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
+
+ CDEBUG(D_NET, "%s: active(%d), version(%x), status(%d)\n",
+ libcfs_nid2str(peer->ibp_nid), active,
+ conn->ibc_version, status);
+
+ LASSERT(!in_interrupt());
+ LASSERT((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
+ peer->ibp_connecting > 0) ||
+ (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
+ peer->ibp_accepting > 0));
+
+ LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
+ conn->ibc_connvars = NULL;
+
+ if (status != 0) {
+ /* failed to establish connection */
+ kiblnd_peer_connect_failed(peer, active, status);
+ kiblnd_finalise_conn(conn);
+ return;
+ }
+
+ /* connection established */
+ write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ conn->ibc_last_send = jiffies;
+ kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
+ kiblnd_peer_alive(peer);
+
+ /* Add conn to peer's list and nuke any dangling conns from a different
+ * peer instance... */
+ kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
+ list_add(&conn->ibc_list, &peer->ibp_conns);
+ if (active)
+ peer->ibp_connecting--;
+ else
+ peer->ibp_accepting--;
+
+ if (peer->ibp_version == 0) {
+ peer->ibp_version = conn->ibc_version;
+ peer->ibp_incarnation = conn->ibc_incarnation;
+ }
+
+ if (peer->ibp_version != conn->ibc_version ||
+ peer->ibp_incarnation != conn->ibc_incarnation) {
+ kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
+ conn->ibc_incarnation);
+ peer->ibp_version = conn->ibc_version;
+ peer->ibp_incarnation = conn->ibc_incarnation;
+ }
+
+ /* grab pending txs while I have the lock */
+ list_add(&txs, &peer->ibp_tx_queue);
+ list_del_init(&peer->ibp_tx_queue);
+
+ if (!kiblnd_peer_active(peer) || /* peer has been deleted */
+ conn->ibc_comms_error != 0) { /* error has happened already */
+ lnet_ni_t *ni = peer->ibp_ni;
+
+ /* start to shut down connection */
+ kiblnd_close_conn_locked(conn, -ECONNABORTED);
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
+
+ return;
+ }
+
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ /* Schedule blocked txs */
+ spin_lock(&conn->ibc_lock);
+ list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
+ list_del(&tx->tx_list);
+
+ kiblnd_queue_tx_locked(tx, conn);
+ }
+ spin_unlock(&conn->ibc_lock);
+
+ kiblnd_check_sends(conn);
+
+ /* schedule blocked rxs */
+ kiblnd_handle_early_rxs(conn);
+}
+
+static void
+kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
+{
+ int rc;
+
+ rc = rdma_reject(cmid, rej, sizeof(*rej));
+
+ if (rc != 0)
+ CWARN("Error %d sending reject\n", rc);
+}
+
+static int
+kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
+{
+ rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
+ kib_msg_t *reqmsg = priv;
+ kib_msg_t *ackmsg;
+ kib_dev_t *ibdev;
+ kib_peer_t *peer;
+ kib_peer_t *peer2;
+ kib_conn_t *conn;
+ lnet_ni_t *ni = NULL;
+ kib_net_t *net = NULL;
+ lnet_nid_t nid;
+ struct rdma_conn_param cp;
+ kib_rej_t rej;
+ int version = IBLND_MSG_VERSION;
+ unsigned long flags;
+ int rc;
+ struct sockaddr_in *peer_addr;
+ LASSERT(!in_interrupt());
+
+ /* cmid inherits 'context' from the corresponding listener id */
+ ibdev = (kib_dev_t *)cmid->context;
+ LASSERT(ibdev != NULL);
+
+ memset(&rej, 0, sizeof(rej));
+ rej.ibr_magic = IBLND_MSG_MAGIC;
+ rej.ibr_why = IBLND_REJECT_FATAL;
+ rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
+
+ peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
+ if (*kiblnd_tunables.kib_require_priv_port &&
+ ntohs(peer_addr->sin_port) >= PROT_SOCK) {
+ __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
+ CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
+ &ip, ntohs(peer_addr->sin_port));
+ goto failed;
+ }
+
+ if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
+ CERROR("Short connection request\n");
+ goto failed;
+ }
+
+ /* Future protocol version compatibility support! If the
+ * o2iblnd-specific protocol changes, or when LNET unifies
+ * protocols over all LNDs, the initial connection will
+ * negotiate a protocol version. I trap this here to avoid
+ * console errors; the reject tells the peer which protocol I
+ * speak. */
+ if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
+ reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
+ goto failed;
+ if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
+ reqmsg->ibm_version != IBLND_MSG_VERSION &&
+ reqmsg->ibm_version != IBLND_MSG_VERSION_1)
+ goto failed;
+ if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
+ reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
+ reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
+ goto failed;
+
+ rc = kiblnd_unpack_msg(reqmsg, priv_nob);
+ if (rc != 0) {
+ CERROR("Can't parse connection request: %d\n", rc);
+ goto failed;
+ }
+
+ nid = reqmsg->ibm_srcnid;
+ ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
+
+ if (ni != NULL) {
+ net = (kib_net_t *)ni->ni_data;
+ rej.ibr_incarnation = net->ibn_incarnation;
+ }
+
+ if (ni == NULL || /* no matching net */
+ ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
+ net->ibn_dev != ibdev) { /* wrong device */
+ CERROR("Can't accept %s on %s (%s:%d:%pI4h): bad dst nid %s\n",
+ libcfs_nid2str(nid),
+ ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
+ ibdev->ibd_ifname, ibdev->ibd_nnets,
+ &ibdev->ibd_ifip,
+ libcfs_nid2str(reqmsg->ibm_dstnid));
+
+ goto failed;
+ }
+
+ /* check time stamp as soon as possible */
+ if (reqmsg->ibm_dststamp != 0 &&
+ reqmsg->ibm_dststamp != net->ibn_incarnation) {
+ CWARN("Stale connection request\n");
+ rej.ibr_why = IBLND_REJECT_CONN_STALE;
+ goto failed;
+ }
+
+ /* I can accept peer's version */
+ version = reqmsg->ibm_version;
+
+ if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
+ CERROR("Unexpected connreq msg type: %x from %s\n",
+ reqmsg->ibm_type, libcfs_nid2str(nid));
+ goto failed;
+ }
+
+ if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
+ IBLND_MSG_QUEUE_SIZE(version)) {
+ CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
+ libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
+ IBLND_MSG_QUEUE_SIZE(version));
+
+ if (version == IBLND_MSG_VERSION)
+ rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
+
+ goto failed;
+ }
+
+ if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
+ IBLND_RDMA_FRAGS(version)) {
+ CERROR("Can't accept %s(version %x): incompatible max_frags %d (%d wanted)\n",
+ libcfs_nid2str(nid), version,
+ reqmsg->ibm_u.connparams.ibcp_max_frags,
+ IBLND_RDMA_FRAGS(version));
+
+ if (version == IBLND_MSG_VERSION)
+ rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
+
+ goto failed;
+
+ }
+
+ if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
+ CERROR("Can't accept %s: message size %d too big (%d max)\n",
+ libcfs_nid2str(nid),
+ reqmsg->ibm_u.connparams.ibcp_max_msg_size,
+ IBLND_MSG_SIZE);
+ goto failed;
+ }
+
+ /* assume 'nid' is a new peer; create */
+ rc = kiblnd_create_peer(ni, &peer, nid);
+ if (rc != 0) {
+ CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
+ rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
+ goto failed;
+ }
+
+ write_lock_irqsave(g_lock, flags);
+
+ peer2 = kiblnd_find_peer_locked(nid);
+ if (peer2 != NULL) {
+ if (peer2->ibp_version == 0) {
+ peer2->ibp_version = version;
+ peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
+ }
+
+ /* not the guy I've talked with */
+ if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
+ peer2->ibp_version != version) {
+ kiblnd_close_peer_conns_locked(peer2, -ESTALE);
+ write_unlock_irqrestore(g_lock, flags);
+
+ CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
+ libcfs_nid2str(nid), peer2->ibp_version, version);
+
+ kiblnd_peer_decref(peer);
+ rej.ibr_why = IBLND_REJECT_CONN_STALE;
+ goto failed;
+ }
+
+ /* tie-break connection race in favour of the higher NID */
+ if (peer2->ibp_connecting != 0 &&
+ nid < ni->ni_nid) {
+ write_unlock_irqrestore(g_lock, flags);
+
+ CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
+
+ kiblnd_peer_decref(peer);
+ rej.ibr_why = IBLND_REJECT_CONN_RACE;
+ goto failed;
+ }
+
+ peer2->ibp_accepting++;
+ kiblnd_peer_addref(peer2);
+
+ write_unlock_irqrestore(g_lock, flags);
+ kiblnd_peer_decref(peer);
+ peer = peer2;
+ } else {
+ /* Brand new peer */
+ LASSERT(peer->ibp_accepting == 0);
+ LASSERT(peer->ibp_version == 0 &&
+ peer->ibp_incarnation == 0);
+
+ peer->ibp_accepting = 1;
+ peer->ibp_version = version;
+ peer->ibp_incarnation = reqmsg->ibm_srcstamp;
+
+ /* I have a ref on ni that prevents it being shutdown */
+ LASSERT(net->ibn_shutdown == 0);
+
+ kiblnd_peer_addref(peer);
+ list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
+
+ write_unlock_irqrestore(g_lock, flags);
+ }
+
+ conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
+ if (conn == NULL) {
+ kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
+ kiblnd_peer_decref(peer);
+ rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
+ goto failed;
+ }
+
+ /* conn now "owns" cmid, so I return success from here on to ensure the
+ * CM callback doesn't destroy cmid. */
+
+ conn->ibc_incarnation = reqmsg->ibm_srcstamp;
+ conn->ibc_credits = IBLND_MSG_QUEUE_SIZE(version);
+ conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
+ LASSERT(conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
+ <= IBLND_RX_MSGS(version));
+
+ ackmsg = &conn->ibc_connvars->cv_msg;
+ memset(ackmsg, 0, sizeof(*ackmsg));
+
+ kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
+ sizeof(ackmsg->ibm_u.connparams));
+ ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
+ ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
+ ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
+
+ kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.private_data = ackmsg;
+ cp.private_data_len = ackmsg->ibm_nob;
+ cp.responder_resources = 0; /* No atomic ops or RDMA reads */
+ cp.initiator_depth = 0;
+ cp.flow_control = 1;
+ cp.retry_count = *kiblnd_tunables.kib_retry_count;
+ cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
+
+ CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
+
+ rc = rdma_accept(cmid, &cp);
+ if (rc != 0) {
+ CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
+ rej.ibr_version = version;
+ rej.ibr_why = IBLND_REJECT_FATAL;
+
+ kiblnd_reject(cmid, &rej);
+ kiblnd_connreq_done(conn, rc);
+ kiblnd_conn_decref(conn);
+ }
+
+ lnet_ni_decref(ni);
+ return 0;
+
+ failed:
+ if (ni != NULL)
+ lnet_ni_decref(ni);
+
+ rej.ibr_version = version;
+ rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
+ rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
+ kiblnd_reject(cmid, &rej);
+
+ return -ECONNREFUSED;
+}
+
+static void
+kiblnd_reconnect(kib_conn_t *conn, int version,
+ __u64 incarnation, int why, kib_connparams_t *cp)
+{
+ kib_peer_t *peer = conn->ibc_peer;
+ char *reason;
+ int retry = 0;
+ unsigned long flags;
+
+ LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
+ LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
+
+ write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ /* retry connection if it's still needed and no other connection
+ * attempts (active or passive) are in progress
+ * NB: reconnect is still needed even when ibp_tx_queue is
+ * empty if ibp_version != version because reconnect may be
+ * initiated by kiblnd_query() */
+ if ((!list_empty(&peer->ibp_tx_queue) ||
+ peer->ibp_version != version) &&
+ peer->ibp_connecting == 1 &&
+ peer->ibp_accepting == 0) {
+ retry = 1;
+ peer->ibp_connecting++;
+
+ peer->ibp_version = version;
+ peer->ibp_incarnation = incarnation;
+ }
+
+ write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ if (!retry)
+ return;
+
+ switch (why) {
+ default:
+ reason = "Unknown";
+ break;
+
+ case IBLND_REJECT_CONN_STALE:
+ reason = "stale";
+ break;
+
+ case IBLND_REJECT_CONN_RACE:
+ reason = "conn race";
+ break;
+
+ case IBLND_REJECT_CONN_UNCOMPAT:
+ reason = "version negotiation";
+ break;
+ }
+
+ CNETERR("%s: retrying (%s), %x, %x, queue_dep: %d, max_frag: %d, msg_size: %d\n",
+ libcfs_nid2str(peer->ibp_nid),
+ reason, IBLND_MSG_VERSION, version,
+ cp != NULL ? cp->ibcp_queue_depth : IBLND_MSG_QUEUE_SIZE(version),
+ cp != NULL ? cp->ibcp_max_frags : IBLND_RDMA_FRAGS(version),
+ cp != NULL ? cp->ibcp_max_msg_size : IBLND_MSG_SIZE);
+
+ kiblnd_connect_peer(peer);
+}
+
+static void
+kiblnd_rejected(kib_conn_t *conn, int reason, void *priv, int priv_nob)
+{
+ kib_peer_t *peer = conn->ibc_peer;
+
+ LASSERT(!in_interrupt());
+ LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
+
+ switch (reason) {
+ case IB_CM_REJ_STALE_CONN:
+ kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
+ IBLND_REJECT_CONN_STALE, NULL);
+ break;
+
+ case IB_CM_REJ_INVALID_SERVICE_ID:
+ CNETERR("%s rejected: no listener at %d\n",
+ libcfs_nid2str(peer->ibp_nid),
+ *kiblnd_tunables.kib_service);
+ break;
+
+ case IB_CM_REJ_CONSUMER_DEFINED:
+ if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
+ kib_rej_t *rej = priv;
+ kib_connparams_t *cp = NULL;
+ int flip = 0;
+ __u64 incarnation = -1;
+
+ /* NB. default incarnation is -1 because:
+ * a) V1 will ignore dst incarnation in connreq.
+ * b) V2 will provide incarnation while rejecting me,
+ * -1 will be overwrote.
+ *
+ * if I try to connect to a V1 peer with V2 protocol,
+ * it rejected me then upgrade to V2, I have no idea
+ * about the upgrading and try to reconnect with V1,
+ * in this case upgraded V2 can find out I'm trying to
+ * talk to the old guy and reject me(incarnation is -1).
+ */
+
+ if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
+ rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
+ __swab32s(&rej->ibr_magic);
+ __swab16s(&rej->ibr_version);
+ flip = 1;
+ }
+
+ if (priv_nob >= sizeof(kib_rej_t) &&
+ rej->ibr_version > IBLND_MSG_VERSION_1) {
+ /* priv_nob is always 148 in current version
+ * of OFED, so we still need to check version.
+ * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
+ cp = &rej->ibr_cp;
+
+ if (flip) {
+ __swab64s(&rej->ibr_incarnation);
+ __swab16s(&cp->ibcp_queue_depth);
+ __swab16s(&cp->ibcp_max_frags);
+ __swab32s(&cp->ibcp_max_msg_size);
+ }
+
+ incarnation = rej->ibr_incarnation;
+ }
+
+ if (rej->ibr_magic != IBLND_MSG_MAGIC &&
+ rej->ibr_magic != LNET_PROTO_MAGIC) {
+ CERROR("%s rejected: consumer defined fatal error\n",
+ libcfs_nid2str(peer->ibp_nid));
+ break;
+ }
+
+ if (rej->ibr_version != IBLND_MSG_VERSION &&
+ rej->ibr_version != IBLND_MSG_VERSION_1) {
+ CERROR("%s rejected: o2iblnd version %x error\n",
+ libcfs_nid2str(peer->ibp_nid),
+ rej->ibr_version);
+ break;
+ }
+
+ if (rej->ibr_why == IBLND_REJECT_FATAL &&
+ rej->ibr_version == IBLND_MSG_VERSION_1) {
+ CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
+ libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
+
+ if (conn->ibc_version != IBLND_MSG_VERSION_1)
+ rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
+ }
+
+ switch (rej->ibr_why) {
+ case IBLND_REJECT_CONN_RACE:
+ case IBLND_REJECT_CONN_STALE:
+ case IBLND_REJECT_CONN_UNCOMPAT:
+ kiblnd_reconnect(conn, rej->ibr_version,
+ incarnation, rej->ibr_why, cp);
+ break;
+
+ case IBLND_REJECT_MSG_QUEUE_SIZE:
+ CERROR("%s rejected: incompatible message queue depth %d, %d\n",
+ libcfs_nid2str(peer->ibp_nid),
+ cp != NULL ? cp->ibcp_queue_depth :
+ IBLND_MSG_QUEUE_SIZE(rej->ibr_version),
+ IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
+ break;
+
+ case IBLND_REJECT_RDMA_FRAGS:
+ CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
+ libcfs_nid2str(peer->ibp_nid),
+ cp != NULL ? cp->ibcp_max_frags :
+ IBLND_RDMA_FRAGS(rej->ibr_version),
+ IBLND_RDMA_FRAGS(conn->ibc_version));
+ break;
+
+ case IBLND_REJECT_NO_RESOURCES:
+ CERROR("%s rejected: o2iblnd no resources\n",
+ libcfs_nid2str(peer->ibp_nid));
+ break;
+
+ case IBLND_REJECT_FATAL:
+ CERROR("%s rejected: o2iblnd fatal error\n",
+ libcfs_nid2str(peer->ibp_nid));
+ break;
+
+ default:
+ CERROR("%s rejected: o2iblnd reason %d\n",
+ libcfs_nid2str(peer->ibp_nid),
+ rej->ibr_why);
+ break;
+ }
+ break;
+ }
+ /* fall through */
+ default:
+ CNETERR("%s rejected: reason %d, size %d\n",
+ libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
+ break;
+ }
+
+ kiblnd_connreq_done(conn, -ECONNREFUSED);
+}
+
+static void
+kiblnd_check_connreply(kib_conn_t *conn, void *priv, int priv_nob)
+{
+ kib_peer_t *peer = conn->ibc_peer;
+ lnet_ni_t *ni = peer->ibp_ni;
+ kib_net_t *net = ni->ni_data;
+ kib_msg_t *msg = priv;
+ int ver = conn->ibc_version;
+ int rc = kiblnd_unpack_msg(msg, priv_nob);
+ unsigned long flags;
+
+ LASSERT(net != NULL);
+
+ if (rc != 0) {
+ CERROR("Can't unpack connack from %s: %d\n",
+ libcfs_nid2str(peer->ibp_nid), rc);
+ goto failed;
+ }
+
+ if (msg->ibm_type != IBLND_MSG_CONNACK) {
+ CERROR("Unexpected message %d from %s\n",
+ msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
+ rc = -EPROTO;
+ goto failed;
+ }
+
+ if (ver != msg->ibm_version) {
+ CERROR("%s replied version %x is different with requested version %x\n",
+ libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
+ rc = -EPROTO;
+ goto failed;
+ }
+
+ if (msg->ibm_u.connparams.ibcp_queue_depth !=
+ IBLND_MSG_QUEUE_SIZE(ver)) {
+ CERROR("%s has incompatible queue depth %d(%d wanted)\n",
+ libcfs_nid2str(peer->ibp_nid),
+ msg->ibm_u.connparams.ibcp_queue_depth,
+ IBLND_MSG_QUEUE_SIZE(ver));
+ rc = -EPROTO;
+ goto failed;
+ }
+
+ if (msg->ibm_u.connparams.ibcp_max_frags !=
+ IBLND_RDMA_FRAGS(ver)) {
+ CERROR("%s has incompatible max_frags %d (%d wanted)\n",
+ libcfs_nid2str(peer->ibp_nid),
+ msg->ibm_u.connparams.ibcp_max_frags,
+ IBLND_RDMA_FRAGS(ver));
+ rc = -EPROTO;
+ goto failed;
+ }
+
+ if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
+ CERROR("%s max message size %d too big (%d max)\n",
+ libcfs_nid2str(peer->ibp_nid),
+ msg->ibm_u.connparams.ibcp_max_msg_size,
+ IBLND_MSG_SIZE);
+ rc = -EPROTO;
+ goto failed;
+ }
+
+ read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+ if (msg->ibm_dstnid == ni->ni_nid &&
+ msg->ibm_dststamp == net->ibn_incarnation)
+ rc = 0;
+ else
+ rc = -ESTALE;
+ read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ if (rc != 0) {
+ CERROR("Bad connection reply from %s, rc = %d, version: %x max_frags: %d\n",
+ libcfs_nid2str(peer->ibp_nid), rc,
+ msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
+ goto failed;
+ }
+
+ conn->ibc_incarnation = msg->ibm_srcstamp;
+ conn->ibc_credits =
+ conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
+ LASSERT(conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
+ <= IBLND_RX_MSGS(ver));
+
+ kiblnd_connreq_done(conn, 0);
+ return;
+
+ failed:
+ /* NB My QP has already established itself, so I handle anything going
+ * wrong here by setting ibc_comms_error.
+ * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
+ * immediately tears it down. */
+
+ LASSERT(rc != 0);
+ conn->ibc_comms_error = rc;
+ kiblnd_connreq_done(conn, 0);
+}
+
+static int
+kiblnd_active_connect(struct rdma_cm_id *cmid)
+{
+ kib_peer_t *peer = (kib_peer_t *)cmid->context;
+ kib_conn_t *conn;
+ kib_msg_t *msg;
+ struct rdma_conn_param cp;
+ int version;
+ __u64 incarnation;
+ unsigned long flags;
+ int rc;
+
+ read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ incarnation = peer->ibp_incarnation;
+ version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
+ peer->ibp_version;
+
+ read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
+ if (conn == NULL) {
+ kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
+ kiblnd_peer_decref(peer); /* lose cmid's ref */
+ return -ENOMEM;
+ }
+
+ /* conn "owns" cmid now, so I return success from here on to ensure the
+ * CM callback doesn't destroy cmid. conn also takes over cmid's ref
+ * on peer */
+
+ msg = &conn->ibc_connvars->cv_msg;
+
+ memset(msg, 0, sizeof(*msg));
+ kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
+ msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
+ msg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
+ msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
+
+ kiblnd_pack_msg(peer->ibp_ni, msg, version,
+ 0, peer->ibp_nid, incarnation);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.private_data = msg;
+ cp.private_data_len = msg->ibm_nob;
+ cp.responder_resources = 0; /* No atomic ops or RDMA reads */
+ cp.initiator_depth = 0;
+ cp.flow_control = 1;
+ cp.retry_count = *kiblnd_tunables.kib_retry_count;
+ cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
+
+ LASSERT(cmid->context == (void *)conn);
+ LASSERT(conn->ibc_cmid == cmid);
+
+ rc = rdma_connect(cmid, &cp);
+ if (rc != 0) {
+ CERROR("Can't connect to %s: %d\n",
+ libcfs_nid2str(peer->ibp_nid), rc);
+ kiblnd_connreq_done(conn, rc);
+ kiblnd_conn_decref(conn);
+ }
+
+ return 0;
+}
+
+int
+kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
+{
+ kib_peer_t *peer;
+ kib_conn_t *conn;
+ int rc;
+
+ switch (event->event) {
+ default:
+ CERROR("Unexpected event: %d, status: %d\n",
+ event->event, event->status);
+ LBUG();
+
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ /* destroy cmid on failure */
+ rc = kiblnd_passive_connect(cmid,
+ (void *)KIBLND_CONN_PARAM(event),
+ KIBLND_CONN_PARAM_LEN(event));
+ CDEBUG(D_NET, "connreq: %d\n", rc);
+ return rc;
+
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ peer = (kib_peer_t *)cmid->context;
+ CNETERR("%s: ADDR ERROR %d\n",
+ libcfs_nid2str(peer->ibp_nid), event->status);
+ kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
+ kiblnd_peer_decref(peer);
+ return -EHOSTUNREACH; /* rc != 0 destroys cmid */
+
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ peer = (kib_peer_t *)cmid->context;
+
+ CDEBUG(D_NET, "%s Addr resolved: %d\n",
+ libcfs_nid2str(peer->ibp_nid), event->status);
+
+ if (event->status != 0) {
+ CNETERR("Can't resolve address for %s: %d\n",
+ libcfs_nid2str(peer->ibp_nid), event->status);
+ rc = event->status;
+ } else {
+ rc = rdma_resolve_route(
+ cmid, *kiblnd_tunables.kib_timeout * 1000);
+ if (rc == 0)
+ return 0;
+ /* Can't initiate route resolution */
+ CERROR("Can't resolve route for %s: %d\n",
+ libcfs_nid2str(peer->ibp_nid), rc);
+ }
+ kiblnd_peer_connect_failed(peer, 1, rc);
+ kiblnd_peer_decref(peer);
+ return rc; /* rc != 0 destroys cmid */
+
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ peer = (kib_peer_t *)cmid->context;
+ CNETERR("%s: ROUTE ERROR %d\n",
+ libcfs_nid2str(peer->ibp_nid), event->status);
+ kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
+ kiblnd_peer_decref(peer);
+ return -EHOSTUNREACH; /* rc != 0 destroys cmid */
+
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ peer = (kib_peer_t *)cmid->context;
+ CDEBUG(D_NET, "%s Route resolved: %d\n",
+ libcfs_nid2str(peer->ibp_nid), event->status);
+
+ if (event->status == 0)
+ return kiblnd_active_connect(cmid);
+
+ CNETERR("Can't resolve route for %s: %d\n",
+ libcfs_nid2str(peer->ibp_nid), event->status);
+ kiblnd_peer_connect_failed(peer, 1, event->status);
+ kiblnd_peer_decref(peer);
+ return event->status; /* rc != 0 destroys cmid */
+
+ case RDMA_CM_EVENT_UNREACHABLE:
+ conn = (kib_conn_t *)cmid->context;
+ LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
+ conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
+ CNETERR("%s: UNREACHABLE %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
+ kiblnd_connreq_done(conn, -ENETDOWN);
+ kiblnd_conn_decref(conn);
+ return 0;
+
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ conn = (kib_conn_t *)cmid->context;
+ LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
+ conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
+ CNETERR("%s: CONNECT ERROR %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
+ kiblnd_connreq_done(conn, -ENOTCONN);
+ kiblnd_conn_decref(conn);
+ return 0;
+
+ case RDMA_CM_EVENT_REJECTED:
+ conn = (kib_conn_t *)cmid->context;
+ switch (conn->ibc_state) {
+ default:
+ LBUG();
+
+ case IBLND_CONN_PASSIVE_WAIT:
+ CERROR("%s: REJECTED %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid),
+ event->status);
+ kiblnd_connreq_done(conn, -ECONNRESET);
+ break;
+
+ case IBLND_CONN_ACTIVE_CONNECT:
+ kiblnd_rejected(conn, event->status,
+ (void *)KIBLND_CONN_PARAM(event),
+ KIBLND_CONN_PARAM_LEN(event));
+ break;
+ }
+ kiblnd_conn_decref(conn);
+ return 0;
+
+ case RDMA_CM_EVENT_ESTABLISHED:
+ conn = (kib_conn_t *)cmid->context;
+ switch (conn->ibc_state) {
+ default:
+ LBUG();
+
+ case IBLND_CONN_PASSIVE_WAIT:
+ CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ kiblnd_connreq_done(conn, 0);
+ break;
+
+ case IBLND_CONN_ACTIVE_CONNECT:
+ CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ kiblnd_check_connreply(conn,
+ (void *)KIBLND_CONN_PARAM(event),
+ KIBLND_CONN_PARAM_LEN(event));
+ break;
+ }
+ /* net keeps its ref on conn! */
+ return 0;
+
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
+ return 0;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ conn = (kib_conn_t *)cmid->context;
+ if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
+ CERROR("%s DISCONNECTED\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ kiblnd_connreq_done(conn, -ECONNRESET);
+ } else {
+ kiblnd_close_conn(conn, 0);
+ }
+ kiblnd_conn_decref(conn);
+ cmid->context = NULL;
+ return 0;
+
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ LCONSOLE_ERROR_MSG(0x131,
+ "Received notification of device removal\n"
+ "Please shutdown LNET to allow this to proceed\n");
+ /* Can't remove network from underneath LNET for now, so I have
+ * to ignore this */
+ return 0;
+
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
+ return 0;
+ }
+}
+
+static int
+kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
+{
+ kib_tx_t *tx;
+ struct list_head *ttmp;
+
+ list_for_each(ttmp, txs) {
+ tx = list_entry(ttmp, kib_tx_t, tx_list);
+
+ if (txs != &conn->ibc_active_txs) {
+ LASSERT(tx->tx_queued);
+ } else {
+ LASSERT(!tx->tx_queued);
+ LASSERT(tx->tx_waiting || tx->tx_sending != 0);
+ }
+
+ if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
+ CERROR("Timed out tx: %s, %lu seconds\n",
+ kiblnd_queue2str(conn, txs),
+ cfs_duration_sec(jiffies - tx->tx_deadline));
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static int
+kiblnd_conn_timed_out_locked(kib_conn_t *conn)
+{
+ return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
+ kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
+ kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
+ kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
+ kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
+}
+
+static void
+kiblnd_check_conns(int idx)
+{
+ LIST_HEAD(closes);
+ LIST_HEAD(checksends);
+ struct list_head *peers = &kiblnd_data.kib_peers[idx];
+ struct list_head *ptmp;
+ kib_peer_t *peer;
+ kib_conn_t *conn;
+ kib_conn_t *tmp;
+ struct list_head *ctmp;
+ unsigned long flags;
+
+ /* NB. We expect to have a look at all the peers and not find any
+ * RDMAs to time out, so we just use a shared lock while we
+ * take a look... */
+ read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
+
+ list_for_each(ptmp, peers) {
+ peer = list_entry(ptmp, kib_peer_t, ibp_list);
+
+ list_for_each(ctmp, &peer->ibp_conns) {
+ int timedout;
+ int sendnoop;
+
+ conn = list_entry(ctmp, kib_conn_t, ibc_list);
+
+ LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
+
+ spin_lock(&conn->ibc_lock);
+
+ sendnoop = kiblnd_need_noop(conn);
+ timedout = kiblnd_conn_timed_out_locked(conn);
+ if (!sendnoop && !timedout) {
+ spin_unlock(&conn->ibc_lock);
+ continue;
+ }
+
+ if (timedout) {
+ CERROR("Timed out RDMA with %s (%lu): c: %u, oc: %u, rc: %u\n",
+ libcfs_nid2str(peer->ibp_nid),
+ cfs_duration_sec(cfs_time_current() -
+ peer->ibp_last_alive),
+ conn->ibc_credits,
+ conn->ibc_outstanding_credits,
+ conn->ibc_reserved_credits);
+ list_add(&conn->ibc_connd_list, &closes);
+ } else {
+ list_add(&conn->ibc_connd_list,
+ &checksends);
+ }
+ /* +ref for 'closes' or 'checksends' */
+ kiblnd_conn_addref(conn);
+
+ spin_unlock(&conn->ibc_lock);
+ }
+ }
+
+ read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
+
+ /* Handle timeout by closing the whole
+ * connection. We can only be sure RDMA activity
+ * has ceased once the QP has been modified. */
+ list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
+ list_del(&conn->ibc_connd_list);
+ kiblnd_close_conn(conn, -ETIMEDOUT);
+ kiblnd_conn_decref(conn);
+ }
+
+ /* In case we have enough credits to return via a
+ * NOOP, but there were no non-blocking tx descs
+ * free to do it last time... */
+ while (!list_empty(&checksends)) {
+ conn = list_entry(checksends.next,
+ kib_conn_t, ibc_connd_list);
+ list_del(&conn->ibc_connd_list);
+ kiblnd_check_sends(conn);
+ kiblnd_conn_decref(conn);
+ }
+}
+
+static void
+kiblnd_disconnect_conn(kib_conn_t *conn)
+{
+ LASSERT(!in_interrupt());
+ LASSERT(current == kiblnd_data.kib_connd);
+ LASSERT(conn->ibc_state == IBLND_CONN_CLOSING);
+
+ rdma_disconnect(conn->ibc_cmid);
+ kiblnd_finalise_conn(conn);
+
+ kiblnd_peer_notify(conn->ibc_peer);
+}
+
+int
+kiblnd_connd(void *arg)
+{
+ wait_queue_t wait;
+ unsigned long flags;
+ kib_conn_t *conn;
+ int timeout;
+ int i;
+ int dropped_lock;
+ int peer_index = 0;
+ unsigned long deadline = jiffies;
+
+ cfs_block_allsigs();
+
+ init_waitqueue_entry(&wait, current);
+ kiblnd_data.kib_connd = current;
+
+ spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
+
+ while (!kiblnd_data.kib_shutdown) {
+
+ dropped_lock = 0;
+
+ if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
+ conn = list_entry(kiblnd_data. \
+ kib_connd_zombies.next,
+ kib_conn_t, ibc_list);
+ list_del(&conn->ibc_list);
+
+ spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
+ flags);
+ dropped_lock = 1;
+
+ kiblnd_destroy_conn(conn);
+
+ spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
+ }
+
+ if (!list_empty(&kiblnd_data.kib_connd_conns)) {
+ conn = list_entry(kiblnd_data.kib_connd_conns.next,
+ kib_conn_t, ibc_list);
+ list_del(&conn->ibc_list);
+
+ spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
+ flags);
+ dropped_lock = 1;
+
+ kiblnd_disconnect_conn(conn);
+ kiblnd_conn_decref(conn);
+
+ spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
+ }
+
+ /* careful with the jiffy wrap... */
+ timeout = (int)(deadline - jiffies);
+ if (timeout <= 0) {
+ const int n = 4;
+ const int p = 1;
+ int chunk = kiblnd_data.kib_peer_hash_size;
+
+ spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
+ dropped_lock = 1;
+
+ /* Time to check for RDMA timeouts on a few more
+ * peers: I do checks every 'p' seconds on a
+ * proportion of the peer table and I need to check
+ * every connection 'n' times within a timeout
+ * interval, to ensure I detect a timeout on any
+ * connection within (n+1)/n times the timeout
+ * interval. */
+
+ if (*kiblnd_tunables.kib_timeout > n * p)
+ chunk = (chunk * n * p) /
+ *kiblnd_tunables.kib_timeout;
+ if (chunk == 0)
+ chunk = 1;
+
+ for (i = 0; i < chunk; i++) {
+ kiblnd_check_conns(peer_index);
+ peer_index = (peer_index + 1) %
+ kiblnd_data.kib_peer_hash_size;
+ }
+
+ deadline += p * HZ;
+ spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
+ }
+
+ if (dropped_lock)
+ continue;
+
+ /* Nothing to do for 'timeout' */
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
+ spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
+
+ schedule_timeout(timeout);
+
+ remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
+ spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
+ }
+
+ spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
+
+ kiblnd_thread_fini();
+ return 0;
+}
+
+void
+kiblnd_qp_event(struct ib_event *event, void *arg)
+{
+ kib_conn_t *conn = arg;
+
+ switch (event->event) {
+ case IB_EVENT_COMM_EST:
+ CDEBUG(D_NET, "%s established\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid));
+ return;
+
+ default:
+ CERROR("%s: Async QP event type %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
+ return;
+ }
+}
+
+static void
+kiblnd_complete(struct ib_wc *wc)
+{
+ switch (kiblnd_wreqid2type(wc->wr_id)) {
+ default:
+ LBUG();
+
+ case IBLND_WID_RDMA:
+ /* We only get RDMA completion notification if it fails. All
+ * subsequent work items, including the final SEND will fail
+ * too. However we can't print out any more info about the
+ * failing RDMA because 'tx' might be back on the idle list or
+ * even reused already if we didn't manage to post all our work
+ * items */
+ CNETERR("RDMA (tx: %p) failed: %d\n",
+ kiblnd_wreqid2ptr(wc->wr_id), wc->status);
+ return;
+
+ case IBLND_WID_TX:
+ kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
+ return;
+
+ case IBLND_WID_RX:
+ kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
+ wc->byte_len);
+ return;
+ }
+}
+
+void
+kiblnd_cq_completion(struct ib_cq *cq, void *arg)
+{
+ /* NB I'm not allowed to schedule this conn once its refcount has
+ * reached 0. Since fundamentally I'm racing with scheduler threads
+ * consuming my CQ I could be called after all completions have
+ * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
+ * and this CQ is about to be destroyed so I NOOP. */
+ kib_conn_t *conn = (kib_conn_t *)arg;
+ struct kib_sched_info *sched = conn->ibc_sched;
+ unsigned long flags;
+
+ LASSERT(cq == conn->ibc_cq);
+
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+
+ conn->ibc_ready = 1;
+
+ if (!conn->ibc_scheduled &&
+ (conn->ibc_nrx > 0 ||
+ conn->ibc_nsends_posted > 0)) {
+ kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
+ conn->ibc_scheduled = 1;
+ list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
+
+ if (waitqueue_active(&sched->ibs_waitq))
+ wake_up(&sched->ibs_waitq);
+ }
+
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+}
+
+void
+kiblnd_cq_event(struct ib_event *event, void *arg)
+{
+ kib_conn_t *conn = arg;
+
+ CERROR("%s: async CQ event type %d\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
+}
+
+int
+kiblnd_scheduler(void *arg)
+{
+ long id = (long)arg;
+ struct kib_sched_info *sched;
+ kib_conn_t *conn;
+ wait_queue_t wait;
+ unsigned long flags;
+ struct ib_wc wc;
+ int did_something;
+ int busy_loops = 0;
+ int rc;
+
+ cfs_block_allsigs();
+
+ init_waitqueue_entry(&wait, current);
+
+ sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
+
+ rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
+ if (rc != 0) {
+ CWARN("Failed to bind on CPT %d, please verify whether all CPUs are healthy and reload modules if necessary, otherwise your system might under risk of low performance\n",
+ sched->ibs_cpt);
+ }
+
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+
+ while (!kiblnd_data.kib_shutdown) {
+ if (busy_loops++ >= IBLND_RESCHED) {
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+
+ cond_resched();
+ busy_loops = 0;
+
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+ }
+
+ did_something = 0;
+
+ if (!list_empty(&sched->ibs_conns)) {
+ conn = list_entry(sched->ibs_conns.next,
+ kib_conn_t, ibc_sched_list);
+ /* take over kib_sched_conns' ref on conn... */
+ LASSERT(conn->ibc_scheduled);
+ list_del(&conn->ibc_sched_list);
+ conn->ibc_ready = 0;
+
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+
+ rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
+ if (rc == 0) {
+ rc = ib_req_notify_cq(conn->ibc_cq,
+ IB_CQ_NEXT_COMP);
+ if (rc < 0) {
+ CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
+ kiblnd_close_conn(conn, -EIO);
+ kiblnd_conn_decref(conn);
+ spin_lock_irqsave(&sched->ibs_lock,
+ flags);
+ continue;
+ }
+
+ rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
+ }
+
+ if (rc < 0) {
+ CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
+ libcfs_nid2str(conn->ibc_peer->ibp_nid),
+ rc);
+ kiblnd_close_conn(conn, -EIO);
+ kiblnd_conn_decref(conn);
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+ continue;
+ }
+
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+
+ if (rc != 0 || conn->ibc_ready) {
+ /* There may be another completion waiting; get
+ * another scheduler to check while I handle
+ * this one... */
+ /* +1 ref for sched_conns */
+ kiblnd_conn_addref(conn);
+ list_add_tail(&conn->ibc_sched_list,
+ &sched->ibs_conns);
+ if (waitqueue_active(&sched->ibs_waitq))
+ wake_up(&sched->ibs_waitq);
+ } else {
+ conn->ibc_scheduled = 0;
+ }
+
+ if (rc != 0) {
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+ kiblnd_complete(&wc);
+
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+ }
+
+ kiblnd_conn_decref(conn); /* ...drop my ref from above */
+ did_something = 1;
+ }
+
+ if (did_something)
+ continue;
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+
+ schedule();
+ busy_loops = 0;
+
+ remove_wait_queue(&sched->ibs_waitq, &wait);
+ spin_lock_irqsave(&sched->ibs_lock, flags);
+ }
+
+ spin_unlock_irqrestore(&sched->ibs_lock, flags);
+
+ kiblnd_thread_fini();
+ return 0;
+}
+
+int
+kiblnd_failover_thread(void *arg)
+{
+ rwlock_t *glock = &kiblnd_data.kib_global_lock;
+ kib_dev_t *dev;
+ wait_queue_t wait;
+ unsigned long flags;
+ int rc;
+
+ LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
+
+ cfs_block_allsigs();
+
+ init_waitqueue_entry(&wait, current);
+ write_lock_irqsave(glock, flags);
+
+ while (!kiblnd_data.kib_shutdown) {
+ int do_failover = 0;
+ int long_sleep;
+
+ list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
+ ibd_fail_list) {
+ if (time_before(cfs_time_current(),
+ dev->ibd_next_failover))
+ continue;
+ do_failover = 1;
+ break;
+ }
+
+ if (do_failover) {
+ list_del_init(&dev->ibd_fail_list);
+ dev->ibd_failover = 1;
+ write_unlock_irqrestore(glock, flags);
+
+ rc = kiblnd_dev_failover(dev);
+
+ write_lock_irqsave(glock, flags);
+
+ LASSERT(dev->ibd_failover);
+ dev->ibd_failover = 0;
+ if (rc >= 0) { /* Device is OK or failover succeed */
+ dev->ibd_next_failover = cfs_time_shift(3);
+ continue;
+ }
+
+ /* failed to failover, retry later */
+ dev->ibd_next_failover =
+ cfs_time_shift(min(dev->ibd_failed_failover, 10));
+ if (kiblnd_dev_can_failover(dev)) {
+ list_add_tail(&dev->ibd_fail_list,
+ &kiblnd_data.kib_failed_devs);
+ }
+
+ continue;
+ }
+
+ /* long sleep if no more pending failover */
+ long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
+ write_unlock_irqrestore(glock, flags);
+
+ rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
+ cfs_time_seconds(1));
+ remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
+ write_lock_irqsave(glock, flags);
+
+ if (!long_sleep || rc != 0)
+ continue;
+
+ /* have a long sleep, routine check all active devices,
+ * we need checking like this because if there is not active
+ * connection on the dev and no SEND from local, we may listen
+ * on wrong HCA for ever while there is a bonding failover */
+ list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
+ if (kiblnd_dev_can_failover(dev)) {
+ list_add_tail(&dev->ibd_fail_list,
+ &kiblnd_data.kib_failed_devs);
+ }
+ }
+ }
+
+ write_unlock_irqrestore(glock, flags);
+
+ kiblnd_thread_fini();
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff