/*- * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 * * Copyright (c) 2006 Mellanox Technologies. All rights reserved * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include #include "ipoib.h" #ifdef CONFIG_INFINIBAND_IPOIB_CM #include #include #include #include #include #include int ipoib_max_conn_qp = 128; module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); MODULE_PARM_DESC(max_nonsrq_conn_qp, "Max number of connected-mode QPs per interface " "(applied only if shared receive queue is not available)"); #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA static int data_debug_level; module_param_named(cm_data_debug_level, data_debug_level, int, 0644); MODULE_PARM_DESC(cm_data_debug_level, "Enable data path debug tracing for connected mode if > 0"); #endif #define IPOIB_CM_IETF_ID 0x1000000000000000ULL #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) #define IPOIB_CM_RX_UPDATE_MASK (0x3) static struct ib_qp_attr ipoib_cm_err_attr = { .qp_state = IB_QPS_ERR }; #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff static struct ib_send_wr ipoib_cm_rx_drain_wr = { .wr_id = IPOIB_CM_RX_DRAIN_WRID, .opcode = IB_WR_SEND, }; static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) { ipoib_dma_unmap_rx(priv, (struct ipoib_rx_buf *)rx_req); } static int ipoib_cm_post_receive_srq(struct ipoib_dev_priv *priv, int id) { const struct ib_recv_wr *bad_wr; struct ipoib_rx_buf *rx_req; struct mbuf *m; int ret; int i; rx_req = (struct ipoib_rx_buf *)&priv->cm.srq_ring[id]; for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { priv->cm.rx_sge[i].addr = rx_req->mapping[i]; priv->cm.rx_sge[i].length = m->m_len; } priv->cm.rx_wr.num_sge = i; priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); if (unlikely(ret)) { ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); ipoib_dma_unmap_rx(priv, rx_req); m_freem(priv->cm.srq_ring[id].mb); priv->cm.srq_ring[id].mb = NULL; } return ret; } static int ipoib_cm_post_receive_nonsrq(struct ipoib_dev_priv *priv, struct ipoib_cm_rx *rx, struct ib_recv_wr *wr, struct ib_sge *sge, int id) { struct ipoib_rx_buf *rx_req; const struct ib_recv_wr *bad_wr; struct mbuf *m; int ret; int i; rx_req = (struct ipoib_rx_buf *)&rx->rx_ring[id]; for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { sge[i].addr = rx_req->mapping[i]; sge[i].length = m->m_len; } wr->num_sge = i; wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; ret = ib_post_recv(rx->qp, wr, &bad_wr); if (unlikely(ret)) { ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); ipoib_dma_unmap_rx(priv, rx_req); m_freem(rx->rx_ring[id].mb); rx->rx_ring[id].mb = NULL; } return ret; } static struct mbuf * ipoib_cm_alloc_rx_mb(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) { return ipoib_alloc_map_mb(priv, (struct ipoib_rx_buf *)rx_req, sizeof(struct ipoib_pseudoheader), priv->cm.max_cm_mtu, IPOIB_CM_RX_SG); } static void ipoib_cm_free_rx_ring(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_ring) { int i; for (i = 0; i < ipoib_recvq_size; ++i) if (rx_ring[i].mb) { ipoib_cm_dma_unmap_rx(priv, &rx_ring[i]); m_freem(rx_ring[i].mb); } kfree(rx_ring); } static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) { const struct ib_send_wr *bad_wr; struct ipoib_cm_rx *p; /* We only reserved 1 extra slot in CQ for drain WRs, so * make sure we have at most 1 outstanding WR. */ if (list_empty(&priv->cm.rx_flush_list) || !list_empty(&priv->cm.rx_drain_list)) return; /* * QPs on flush list are error state. This way, a "flush * error" WC will be immediately generated for each WR we post. */ p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) ipoib_warn(priv, "failed to post drain wr\n"); list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); } static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) { struct ipoib_cm_rx *p = ctx; struct ipoib_dev_priv *priv = p->priv; unsigned long flags; if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) return; spin_lock_irqsave(&priv->lock, flags); list_move(&p->list, &priv->cm.rx_flush_list); p->state = IPOIB_CM_RX_FLUSH; ipoib_cm_start_rx_drain(priv); spin_unlock_irqrestore(&priv->lock, flags); } static struct ib_qp *ipoib_cm_create_rx_qp(struct ipoib_dev_priv *priv, struct ipoib_cm_rx *p) { struct ib_qp_init_attr attr = { .event_handler = ipoib_cm_rx_event_handler, .send_cq = priv->recv_cq, /* For drain WR */ .recv_cq = priv->recv_cq, .srq = priv->cm.srq, .cap.max_send_wr = 1, /* For drain WR */ .cap.max_send_sge = 1, .sq_sig_type = IB_SIGNAL_ALL_WR, .qp_type = IB_QPT_RC, .qp_context = p, }; if (!ipoib_cm_has_srq(priv)) { attr.cap.max_recv_wr = ipoib_recvq_size; attr.cap.max_recv_sge = priv->cm.num_frags; } return ib_create_qp(priv->pd, &attr); } static int ipoib_cm_modify_rx_qp(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, struct ib_qp *qp, unsigned psn) { struct ib_qp_attr qp_attr; int qp_attr_mask, ret; qp_attr.qp_state = IB_QPS_INIT; ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); return ret; } ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); return ret; } qp_attr.qp_state = IB_QPS_RTR; ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); return ret; } qp_attr.rq_psn = psn; ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); return ret; } /* * Current Mellanox HCA firmware won't generate completions * with error for drain WRs unless the QP has been moved to * RTS first. This work-around leaves a window where a QP has * moved to error asynchronously, but this will eventually get * fixed in firmware, so let's not error out if modify QP * fails. */ qp_attr.qp_state = IB_QPS_RTS; ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); return 0; } ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); return 0; } return 0; } static void ipoib_cm_init_rx_wr(struct ipoib_dev_priv *priv, struct ib_recv_wr *wr, struct ib_sge *sge) { int i; for (i = 0; i < IPOIB_CM_RX_SG; i++) sge[i].lkey = priv->pd->local_dma_lkey; wr->next = NULL; wr->sg_list = sge; wr->num_sge = 1; } static int ipoib_cm_nonsrq_init_rx(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, struct ipoib_cm_rx *rx) { struct { struct ib_recv_wr wr; struct ib_sge sge[IPOIB_CM_RX_SG]; } *t; int ret; int i; rx->rx_ring = kzalloc(ipoib_recvq_size * sizeof *rx->rx_ring, GFP_KERNEL); if (!rx->rx_ring) { printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", priv->ca->name, ipoib_recvq_size); return -ENOMEM; } memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring); t = kmalloc(sizeof *t, GFP_KERNEL); if (!t) { ret = -ENOMEM; goto err_free; } ipoib_cm_init_rx_wr(priv, &t->wr, t->sge); spin_lock_irq(&priv->lock); if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { spin_unlock_irq(&priv->lock); ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); ret = -EINVAL; goto err_free; } else ++priv->cm.nonsrq_conn_qp; spin_unlock_irq(&priv->lock); for (i = 0; i < ipoib_recvq_size; ++i) { if (!ipoib_cm_alloc_rx_mb(priv, &rx->rx_ring[i])) { ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); ret = -ENOMEM; goto err_count; } ret = ipoib_cm_post_receive_nonsrq(priv, rx, &t->wr, t->sge, i); if (ret) { ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " "failed for buf %d\n", i); ret = -EIO; goto err_count; } } rx->recv_count = ipoib_recvq_size; kfree(t); return 0; err_count: spin_lock_irq(&priv->lock); --priv->cm.nonsrq_conn_qp; spin_unlock_irq(&priv->lock); err_free: kfree(t); ipoib_cm_free_rx_ring(priv, rx->rx_ring); return ret; } static int ipoib_cm_send_rep(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, struct ib_qp *qp, struct ib_cm_req_event_param *req, unsigned psn) { struct ipoib_cm_data data = {}; struct ib_cm_rep_param rep = {}; data.qpn = cpu_to_be32(priv->qp->qp_num); data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); rep.private_data = &data; rep.private_data_len = sizeof data; rep.flow_control = 0; rep.rnr_retry_count = req->rnr_retry_count; rep.srq = ipoib_cm_has_srq(priv); rep.qp_num = qp->qp_num; rep.starting_psn = psn; return ib_send_cm_rep(cm_id, &rep); } static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) { struct ipoib_dev_priv *priv = cm_id->context; struct ipoib_cm_rx *p; unsigned psn; int ret; ipoib_dbg(priv, "REQ arrived\n"); p = kzalloc(sizeof *p, GFP_KERNEL); if (!p) return -ENOMEM; p->priv = priv; p->id = cm_id; cm_id->context = p; p->state = IPOIB_CM_RX_LIVE; p->jiffies = jiffies; INIT_LIST_HEAD(&p->list); p->qp = ipoib_cm_create_rx_qp(priv, p); if (IS_ERR(p->qp)) { ret = PTR_ERR(p->qp); goto err_qp; } psn = random() & 0xffffff; ret = ipoib_cm_modify_rx_qp(priv, cm_id, p->qp, psn); if (ret) goto err_modify; if (!ipoib_cm_has_srq(priv)) { ret = ipoib_cm_nonsrq_init_rx(priv, cm_id, p); if (ret) goto err_modify; } spin_lock_irq(&priv->lock); queue_delayed_work(ipoib_workqueue, &priv->cm.stale_task, IPOIB_CM_RX_DELAY); /* Add this entry to passive ids list head, but do not re-add it * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ p->jiffies = jiffies; if (p->state == IPOIB_CM_RX_LIVE) list_move(&p->list, &priv->cm.passive_ids); spin_unlock_irq(&priv->lock); ret = ipoib_cm_send_rep(priv, cm_id, p->qp, &event->param.req_rcvd, psn); if (ret) { ipoib_warn(priv, "failed to send REP: %d\n", ret); if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) ipoib_warn(priv, "unable to move qp to error state\n"); } return 0; err_modify: ib_destroy_qp(p->qp); err_qp: kfree(p); return ret; } static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) { struct ipoib_cm_rx *p; struct ipoib_dev_priv *priv; switch (event->event) { case IB_CM_REQ_RECEIVED: return ipoib_cm_req_handler(cm_id, event); case IB_CM_DREQ_RECEIVED: p = cm_id->context; ib_send_cm_drep(cm_id, NULL, 0); /* Fall through */ case IB_CM_REJ_RECEIVED: p = cm_id->context; priv = p->priv; if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) ipoib_warn(priv, "unable to move qp to error state\n"); /* Fall through */ default: return 0; } } void ipoib_cm_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) { struct ipoib_cm_rx_buf saverx; struct ipoib_cm_rx_buf *rx_ring; unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); if_t dev = priv->dev; struct mbuf *mb, *newmb; struct ipoib_cm_rx *p; int has_srq; ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", wr_id, wc->status); if (unlikely(wr_id >= ipoib_recvq_size)) { if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { spin_lock(&priv->lock); list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); ipoib_cm_start_rx_drain(priv); if (priv->cm.id != NULL) queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); spin_unlock(&priv->lock); } else ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", wr_id, ipoib_recvq_size); goto done; } p = wc->qp->qp_context; has_srq = ipoib_cm_has_srq(priv); rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; mb = rx_ring[wr_id].mb; if (unlikely(wc->status != IB_WC_SUCCESS)) { ipoib_dbg(priv, "cm recv error " "(status=%d, wrid=%d vend_err %x)\n", wc->status, wr_id, wc->vendor_err); if_inc_counter(dev, IFCOUNTER_IERRORS, 1); if (has_srq) goto repost; else { if (!--p->recv_count) { spin_lock(&priv->lock); list_move(&p->list, &priv->cm.rx_reap_list); queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); spin_unlock(&priv->lock); } goto done; } } if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { p->jiffies = jiffies; /* Move this entry to list head, but do not re-add it * if it has been moved out of list. */ if (p->state == IPOIB_CM_RX_LIVE) list_move(&p->list, &priv->cm.passive_ids); } } memcpy(&saverx, &rx_ring[wr_id], sizeof(saverx)); newmb = ipoib_cm_alloc_rx_mb(priv, &rx_ring[wr_id]); if (unlikely(!newmb)) { /* * If we can't allocate a new RX buffer, dump * this packet and reuse the old buffer. */ ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); if_inc_counter(dev, IFCOUNTER_IERRORS, 1); memcpy(&rx_ring[wr_id], &saverx, sizeof(saverx)); goto repost; } ipoib_cm_dma_unmap_rx(priv, &saverx); ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", wc->byte_len, wc->slid); ipoib_dma_mb(priv, mb, wc->byte_len); mb->m_pkthdr.rcvif = dev; M_PREPEND(mb, sizeof(struct ipoib_pseudoheader), M_NOWAIT); if (likely(mb != NULL)) { struct ipoib_header *ibh; if_inc_counter(dev, IFCOUNTER_IPACKETS, 1); if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len); /* fixup destination infiniband address */ ibh = mtod(mb, struct ipoib_header *); memset(ibh->hwaddr, 0, 4); memcpy(ibh->hwaddr + 4, priv->local_gid.raw, sizeof(union ib_gid)); if_input(dev, mb); } else { if_inc_counter(dev, IFCOUNTER_IERRORS, 1); } repost: if (has_srq) { if (unlikely(ipoib_cm_post_receive_srq(priv, wr_id))) ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " "for buf %d\n", wr_id); } else { if (unlikely(ipoib_cm_post_receive_nonsrq(priv, p, &priv->cm.rx_wr, priv->cm.rx_sge, wr_id))) { --p->recv_count; ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " "for buf %d\n", wr_id); } } done: return; } static inline int post_send(struct ipoib_dev_priv *priv, struct ipoib_cm_tx *tx, struct ipoib_cm_tx_buf *tx_req, unsigned int wr_id) { const struct ib_send_wr *bad_wr; struct mbuf *mb = tx_req->mb; u64 *mapping = tx_req->mapping; struct mbuf *m; int i; for (m = mb, i = 0; m != NULL; m = m->m_next, i++) { priv->tx_sge[i].addr = mapping[i]; priv->tx_sge[i].length = m->m_len; } priv->tx_wr.wr.num_sge = i; priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; priv->tx_wr.wr.opcode = IB_WR_SEND; return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); } void ipoib_cm_send(struct ipoib_dev_priv *priv, struct mbuf *mb, struct ipoib_cm_tx *tx) { struct ipoib_cm_tx_buf *tx_req; if_t dev = priv->dev; if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) { while (ipoib_poll_tx(priv, false)) ; /* nothing */ } m_adj(mb, sizeof(struct ipoib_pseudoheader)); if (unlikely(mb->m_pkthdr.len > tx->mtu)) { ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", mb->m_pkthdr.len, tx->mtu); if_inc_counter(dev, IFCOUNTER_OERRORS, 1); ipoib_cm_mb_too_long(priv, mb, IPOIB_CM_MTU(tx->mtu)); return; } ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", tx->tx_head, mb->m_pkthdr.len, tx->qp->qp_num); /* * We put the mb into the tx_ring _before_ we call post_send() * because it's entirely possible that the completion handler will * run before we execute anything after the post_send(). That * means we have to make sure everything is properly recorded and * our state is consistent before we call post_send(). */ tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; tx_req->mb = mb; if (unlikely(ipoib_dma_map_tx(priv->ca, (struct ipoib_tx_buf *)tx_req, priv->cm.num_frags))) { if_inc_counter(dev, IFCOUNTER_OERRORS, 1); if (tx_req->mb) m_freem(tx_req->mb); return; } if (unlikely(post_send(priv, tx, tx_req, tx->tx_head & (ipoib_sendq_size - 1)))) { ipoib_warn(priv, "post_send failed\n"); if_inc_counter(dev, IFCOUNTER_OERRORS, 1); ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); m_freem(mb); } else { ++tx->tx_head; if (++priv->tx_outstanding == ipoib_sendq_size) { ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", tx->qp->qp_num); if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) ipoib_warn(priv, "request notify on send CQ failed\n"); if_setdrvflagbits(dev, IFF_DRV_OACTIVE, 0); } } } void ipoib_cm_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) { struct ipoib_cm_tx *tx = wc->qp->qp_context; unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; if_t dev = priv->dev; struct ipoib_cm_tx_buf *tx_req; ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", wr_id, wc->status); if (unlikely(wr_id >= ipoib_sendq_size)) { ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", wr_id, ipoib_sendq_size); return; } tx_req = &tx->tx_ring[wr_id]; ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); /* FIXME: is this right? Shouldn't we only increment on success? */ if_inc_counter(dev, IFCOUNTER_OPACKETS, 1); m_freem(tx_req->mb); ++tx->tx_tail; if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && (if_getdrvflags(dev) & IFF_DRV_OACTIVE) != 0 && test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) if_setdrvflagbits(dev, 0, IFF_DRV_OACTIVE); if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR) { struct ipoib_path *path; ipoib_dbg(priv, "failed cm send event " "(status=%d, wrid=%d vend_err %x)\n", wc->status, wr_id, wc->vendor_err); path = tx->path; if (path) { path->cm = NULL; rb_erase(&path->rb_node, &priv->path_tree); list_del(&path->list); } if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { list_move(&tx->list, &priv->cm.reap_list); queue_work(ipoib_workqueue, &priv->cm.reap_task); } clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); } } int ipoib_cm_dev_open(struct ipoib_dev_priv *priv) { int ret; if (!IPOIB_CM_SUPPORTED(if_getlladdr(priv->dev))) return 0; priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv); if (IS_ERR(priv->cm.id)) { printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); ret = PTR_ERR(priv->cm.id); goto err_cm; } ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 0); if (ret) { printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, IPOIB_CM_IETF_ID | priv->qp->qp_num); goto err_listen; } return 0; err_listen: ib_destroy_cm_id(priv->cm.id); err_cm: priv->cm.id = NULL; return ret; } static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv) { struct ipoib_cm_rx *rx, *n; LIST_HEAD(list); spin_lock_irq(&priv->lock); list_splice_init(&priv->cm.rx_reap_list, &list); spin_unlock_irq(&priv->lock); list_for_each_entry_safe(rx, n, &list, list) { ib_destroy_cm_id(rx->id); ib_destroy_qp(rx->qp); if (!ipoib_cm_has_srq(priv)) { ipoib_cm_free_rx_ring(priv, rx->rx_ring); spin_lock_irq(&priv->lock); --priv->cm.nonsrq_conn_qp; spin_unlock_irq(&priv->lock); } kfree(rx); } } void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv) { struct ipoib_cm_rx *p; unsigned long begin; int ret; if (!IPOIB_CM_SUPPORTED(if_getlladdr(priv->dev)) || !priv->cm.id) return; ib_destroy_cm_id(priv->cm.id); priv->cm.id = NULL; cancel_work_sync(&priv->cm.rx_reap_task); spin_lock_irq(&priv->lock); while (!list_empty(&priv->cm.passive_ids)) { p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); list_move(&p->list, &priv->cm.rx_error_list); p->state = IPOIB_CM_RX_ERROR; spin_unlock_irq(&priv->lock); ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); if (ret) ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); spin_lock_irq(&priv->lock); } /* Wait for all RX to be drained */ begin = jiffies; while (!list_empty(&priv->cm.rx_error_list) || !list_empty(&priv->cm.rx_flush_list) || !list_empty(&priv->cm.rx_drain_list)) { if (time_after(jiffies, begin + 5 * HZ)) { ipoib_warn(priv, "RX drain timing out\n"); /* * assume the HW is wedged and just free up everything. */ list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_reap_list); list_splice_init(&priv->cm.rx_error_list, &priv->cm.rx_reap_list); list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); break; } spin_unlock_irq(&priv->lock); msleep(1); ipoib_drain_cq(priv); spin_lock_irq(&priv->lock); } spin_unlock_irq(&priv->lock); ipoib_cm_free_rx_reap_list(priv); cancel_delayed_work_sync(&priv->cm.stale_task); } static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) { struct ipoib_cm_tx *p = cm_id->context; struct ipoib_dev_priv *priv = p->priv; struct ipoib_cm_data *data = event->private_data; struct epoch_tracker et; struct ifqueue mbqueue; struct ib_qp_attr qp_attr; int qp_attr_mask, ret; struct mbuf *mb; ipoib_dbg(priv, "cm rep handler\n"); p->mtu = be32_to_cpu(data->mtu); if (p->mtu <= IPOIB_ENCAP_LEN) { ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", p->mtu, IPOIB_ENCAP_LEN); return -EINVAL; } qp_attr.qp_state = IB_QPS_RTR; ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); return ret; } qp_attr.rq_psn = 0 /* FIXME */; ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); return ret; } qp_attr.qp_state = IB_QPS_RTS; ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); return ret; } ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); return ret; } bzero(&mbqueue, sizeof(mbqueue)); spin_lock_irq(&priv->lock); set_bit(IPOIB_FLAG_OPER_UP, &p->flags); if (p->path) for (;;) { _IF_DEQUEUE(&p->path->queue, mb); if (mb == NULL) break; _IF_ENQUEUE(&mbqueue, mb); } spin_unlock_irq(&priv->lock); NET_EPOCH_ENTER(et); for (;;) { if_t dev = p->priv->dev; _IF_DEQUEUE(&mbqueue, mb); if (mb == NULL) break; mb->m_pkthdr.rcvif = dev; if (if_transmit(dev, mb)) ipoib_warn(priv, "dev_queue_xmit failed " "to requeue packet\n"); } NET_EPOCH_EXIT(et); ret = ib_send_cm_rtu(cm_id, NULL, 0); if (ret) { ipoib_warn(priv, "failed to send RTU: %d\n", ret); return ret; } return 0; } static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv, struct ipoib_cm_tx *tx) { struct ib_qp_init_attr attr = { .send_cq = priv->send_cq, .recv_cq = priv->recv_cq, .srq = priv->cm.srq, .cap.max_send_wr = ipoib_sendq_size, .cap.max_send_sge = priv->cm.num_frags, .sq_sig_type = IB_SIGNAL_ALL_WR, .qp_type = IB_QPT_RC, .qp_context = tx }; return ib_create_qp(priv->pd, &attr); } static int ipoib_cm_send_req(struct ipoib_dev_priv *priv, struct ib_cm_id *id, struct ib_qp *qp, u32 qpn, struct ib_sa_path_rec *pathrec) { struct ipoib_cm_data data = {}; struct ib_cm_req_param req = {}; ipoib_dbg(priv, "cm send req\n"); data.qpn = cpu_to_be32(priv->qp->qp_num); data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); req.primary_path = pathrec; req.alternate_path = NULL; req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); req.qp_num = qp->qp_num; req.qp_type = qp->qp_type; req.private_data = &data; req.private_data_len = sizeof data; req.flow_control = 0; req.starting_psn = 0; /* FIXME */ /* * Pick some arbitrary defaults here; we could make these * module parameters if anyone cared about setting them. */ req.responder_resources = 4; req.remote_cm_response_timeout = 20; req.local_cm_response_timeout = 20; req.retry_count = 0; /* RFC draft warns against retries */ req.rnr_retry_count = 0; /* RFC draft warns against retries */ req.max_cm_retries = 15; req.srq = ipoib_cm_has_srq(priv); return ib_send_cm_req(id, &req); } static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, struct ib_qp *qp) { struct ib_qp_attr qp_attr; int qp_attr_mask, ret; ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); if (ret) { ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); return ret; } qp_attr.qp_state = IB_QPS_INIT; qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; qp_attr.port_num = priv->port; qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); if (ret) { ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); return ret; } return 0; } static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, struct ib_sa_path_rec *pathrec) { struct ipoib_dev_priv *priv = p->priv; int ret; p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL); if (!p->tx_ring) { ipoib_warn(priv, "failed to allocate tx ring\n"); ret = -ENOMEM; goto err_tx; } memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); p->qp = ipoib_cm_create_tx_qp(p->priv, p); if (IS_ERR(p->qp)) { ret = PTR_ERR(p->qp); ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); goto err_qp; } p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); if (IS_ERR(p->id)) { ret = PTR_ERR(p->id); ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); goto err_id; } ret = ipoib_cm_modify_tx_init(p->priv, p->id, p->qp); if (ret) { ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); goto err_modify; } ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec); if (ret) { ipoib_warn(priv, "failed to send cm req: %d\n", ret); goto err_send_cm; } ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", p->qp->qp_num, pathrec->dgid.raw, qpn); return 0; err_send_cm: err_modify: ib_destroy_cm_id(p->id); err_id: p->id = NULL; ib_destroy_qp(p->qp); err_qp: p->qp = NULL; kfree(p->tx_ring); err_tx: return ret; } static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) { struct ipoib_dev_priv *priv = p->priv; if_t dev = priv->dev; struct ipoib_cm_tx_buf *tx_req; unsigned long begin; ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); if (p->path) ipoib_path_free(priv, p->path); if (p->id) ib_destroy_cm_id(p->id); if (p->tx_ring) { /* Wait for all sends to complete */ begin = jiffies; while ((int) p->tx_tail - (int) p->tx_head < 0) { if (time_after(jiffies, begin + 5 * HZ)) { ipoib_warn(priv, "timing out; %d sends not completed\n", p->tx_head - p->tx_tail); goto timeout; } msleep(1); } } timeout: while ((int) p->tx_tail - (int) p->tx_head < 0) { tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); m_freem(tx_req->mb); ++p->tx_tail; if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && (if_getdrvflags(dev) & IFF_DRV_OACTIVE) != 0 && test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) if_setdrvflagbits(dev, 0, IFF_DRV_OACTIVE); } if (p->qp) ib_destroy_qp(p->qp); kfree(p->tx_ring); kfree(p); } static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) { struct ipoib_cm_tx *tx = cm_id->context; struct ipoib_dev_priv *priv = tx->priv; struct ipoib_path *path; unsigned long flags; int ret; switch (event->event) { case IB_CM_DREQ_RECEIVED: ipoib_dbg(priv, "DREQ received.\n"); ib_send_cm_drep(cm_id, NULL, 0); break; case IB_CM_REP_RECEIVED: ipoib_dbg(priv, "REP received.\n"); ret = ipoib_cm_rep_handler(cm_id, event); if (ret) ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, NULL, 0); break; case IB_CM_REQ_ERROR: case IB_CM_REJ_RECEIVED: case IB_CM_TIMEWAIT_EXIT: ipoib_dbg(priv, "CM error %d.\n", event->event); spin_lock_irqsave(&priv->lock, flags); path = tx->path; if (path) { path->cm = NULL; tx->path = NULL; rb_erase(&path->rb_node, &priv->path_tree); list_del(&path->list); } if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { list_move(&tx->list, &priv->cm.reap_list); queue_work(ipoib_workqueue, &priv->cm.reap_task); } spin_unlock_irqrestore(&priv->lock, flags); if (path) ipoib_path_free(tx->priv, path); break; default: break; } return 0; } struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv, struct ipoib_path *path) { struct ipoib_cm_tx *tx; tx = kzalloc(sizeof *tx, GFP_ATOMIC); if (!tx) return NULL; ipoib_dbg(priv, "Creating cm tx\n"); path->cm = tx; tx->path = path; tx->priv = priv; list_add(&tx->list, &priv->cm.start_list); set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); queue_work(ipoib_workqueue, &priv->cm.start_task); return tx; } void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) { struct ipoib_dev_priv *priv = tx->priv; if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { spin_lock(&priv->lock); list_move(&tx->list, &priv->cm.reap_list); spin_unlock(&priv->lock); queue_work(ipoib_workqueue, &priv->cm.reap_task); ipoib_dbg(priv, "Reap connection for gid %pI6\n", tx->path->pathrec.dgid.raw); tx->path = NULL; } } static void ipoib_cm_tx_start(struct work_struct *work) { struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, cm.start_task); struct ipoib_path *path; struct ipoib_cm_tx *p; unsigned long flags; int ret; struct ib_sa_path_rec pathrec; u32 qpn; ipoib_dbg(priv, "cm start task\n"); spin_lock_irqsave(&priv->lock, flags); while (!list_empty(&priv->cm.start_list)) { p = list_entry(priv->cm.start_list.next, typeof(*p), list); list_del_init(&p->list); path = p->path; qpn = IPOIB_QPN(path->hwaddr); memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); spin_unlock_irqrestore(&priv->lock, flags); ret = ipoib_cm_tx_init(p, qpn, &pathrec); spin_lock_irqsave(&priv->lock, flags); if (ret) { path = p->path; if (path) { path->cm = NULL; rb_erase(&path->rb_node, &priv->path_tree); list_del(&path->list); ipoib_path_free(priv, path); } list_del(&p->list); kfree(p); } } spin_unlock_irqrestore(&priv->lock, flags); } static void ipoib_cm_tx_reap(struct work_struct *work) { struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, cm.reap_task); struct ipoib_cm_tx *p; unsigned long flags; spin_lock_irqsave(&priv->lock, flags); while (!list_empty(&priv->cm.reap_list)) { p = list_entry(priv->cm.reap_list.next, typeof(*p), list); list_del(&p->list); spin_unlock_irqrestore(&priv->lock, flags); ipoib_cm_tx_destroy(p); spin_lock_irqsave(&priv->lock, flags); } spin_unlock_irqrestore(&priv->lock, flags); } static void ipoib_cm_mb_reap(struct work_struct *work) { struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, cm.mb_task); struct mbuf *mb; unsigned long flags; #if defined(INET) || defined(INET6) unsigned mtu = priv->mcast_mtu; #endif uint16_t proto; spin_lock_irqsave(&priv->lock, flags); CURVNET_SET_QUIET(if_getvnet(priv->dev)); for (;;) { IF_DEQUEUE(&priv->cm.mb_queue, mb); if (mb == NULL) break; spin_unlock_irqrestore(&priv->lock, flags); proto = htons(*mtod(mb, uint16_t *)); m_adj(mb, IPOIB_ENCAP_LEN); switch (proto) { #if defined(INET) case ETHERTYPE_IP: icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu); break; #endif #if defined(INET6) case ETHERTYPE_IPV6: icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu); break; #endif default: m_freem(mb); } spin_lock_irqsave(&priv->lock, flags); } CURVNET_RESTORE(); spin_unlock_irqrestore(&priv->lock, flags); } void ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu) { int e = priv->cm.mb_queue.ifq_len; IF_ENQUEUE(&priv->cm.mb_queue, mb); if (e == 0) queue_work(ipoib_workqueue, &priv->cm.mb_task); } static void ipoib_cm_rx_reap(struct work_struct *work) { ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, cm.rx_reap_task)); } static void ipoib_cm_stale_task(struct work_struct *work) { struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, cm.stale_task.work); struct ipoib_cm_rx *p; int ret; spin_lock_irq(&priv->lock); while (!list_empty(&priv->cm.passive_ids)) { /* List is sorted by LRU, start from tail, * stop when we see a recently used entry */ p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) break; list_move(&p->list, &priv->cm.rx_error_list); p->state = IPOIB_CM_RX_ERROR; spin_unlock_irq(&priv->lock); ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); if (ret) ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); spin_lock_irq(&priv->lock); } if (!list_empty(&priv->cm.passive_ids)) queue_delayed_work(ipoib_workqueue, &priv->cm.stale_task, IPOIB_CM_RX_DELAY); spin_unlock_irq(&priv->lock); } static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge) { struct ib_srq_init_attr srq_init_attr = { .attr = { .max_wr = ipoib_recvq_size, .max_sge = max_sge } }; priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); if (IS_ERR(priv->cm.srq)) { if (PTR_ERR(priv->cm.srq) != -ENOSYS) printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", priv->ca->name, PTR_ERR(priv->cm.srq)); priv->cm.srq = NULL; return; } priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL); if (!priv->cm.srq_ring) { printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", priv->ca->name, ipoib_recvq_size); ib_destroy_srq(priv->cm.srq); priv->cm.srq = NULL; return; } memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring); } int ipoib_cm_dev_init(struct ipoib_dev_priv *priv) { if_t dev = priv->dev; int i; int max_srq_sge; INIT_LIST_HEAD(&priv->cm.passive_ids); INIT_LIST_HEAD(&priv->cm.reap_list); INIT_LIST_HEAD(&priv->cm.start_list); INIT_LIST_HEAD(&priv->cm.rx_error_list); INIT_LIST_HEAD(&priv->cm.rx_flush_list); INIT_LIST_HEAD(&priv->cm.rx_drain_list); INIT_LIST_HEAD(&priv->cm.rx_reap_list); INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap); INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue)); mtx_init(&priv->cm.mb_queue.ifq_mtx, if_name(dev), "if send queue", MTX_DEF); max_srq_sge = priv->ca->attrs.max_srq_sge; ipoib_dbg(priv, "max_srq_sge=%d\n", max_srq_sge); max_srq_sge = min_t(int, IPOIB_CM_RX_SG, max_srq_sge); ipoib_cm_create_srq(priv, max_srq_sge); if (ipoib_cm_has_srq(priv)) { priv->cm.max_cm_mtu = max_srq_sge * MJUMPAGESIZE; priv->cm.num_frags = max_srq_sge; ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", priv->cm.max_cm_mtu, priv->cm.num_frags); } else { priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU; priv->cm.num_frags = IPOIB_CM_RX_SG; } ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge); if (ipoib_cm_has_srq(priv)) { for (i = 0; i < ipoib_recvq_size; ++i) { if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) { ipoib_warn(priv, "failed to allocate " "receive buffer %d\n", i); ipoib_cm_dev_cleanup(priv); return -ENOMEM; } if (ipoib_cm_post_receive_srq(priv, i)) { ipoib_warn(priv, "ipoib_cm_post_receive_srq " "failed for buf %d\n", i); ipoib_cm_dev_cleanup(priv); return -EIO; } } } if_getlladdr(priv->dev)[0] = IPOIB_FLAGS_RC; return 0; } void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv) { int ret; if (!priv->cm.srq) return; ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); ret = ib_destroy_srq(priv->cm.srq); if (ret) ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); priv->cm.srq = NULL; if (!priv->cm.srq_ring) return; ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring); priv->cm.srq_ring = NULL; mtx_destroy(&priv->cm.mb_queue.ifq_mtx); } #endif /* CONFIG_INFINIBAND_IPOIB_CM */