/* * Copyright (c) 2006 Oracle. 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 <linux/kernel.h> #include <linux/in.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/ratelimit.h> #include "rds.h" #include "iw.h" /* * Set the selected protocol version */ static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version) { conn->c_version = version; } /* * Set up flow control */ static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits) { struct rds_iw_connection *ic = conn->c_transport_data; if (rds_iw_sysctl_flow_control && credits != 0) { /* We're doing flow control */ ic->i_flowctl = 1; rds_iw_send_add_credits(conn, credits); } else { ic->i_flowctl = 0; } } /* * Connection established. * We get here for both outgoing and incoming connection. */ void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) { const struct rds_iw_connect_private *dp = NULL; struct rds_iw_connection *ic = conn->c_transport_data; struct rds_iw_device *rds_iwdev; int err; if (event->param.conn.private_data_len) { dp = event->param.conn.private_data; rds_iw_set_protocol(conn, RDS_PROTOCOL(dp->dp_protocol_major, dp->dp_protocol_minor)); rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); } /* update ib_device with this local ipaddr & conn */ rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id); if (err) printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err); rds_iw_add_conn(rds_iwdev, conn); /* If the peer gave us the last packet it saw, process this as if * we had received a regular ACK. */ if (dp && dp->dp_ack_seq) rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n", &conn->c_laddr, &conn->c_faddr, RDS_PROTOCOL_MAJOR(conn->c_version), RDS_PROTOCOL_MINOR(conn->c_version), ic->i_flowctl ? ", flow control" : ""); rds_connect_complete(conn); } static void rds_iw_cm_fill_conn_param(struct rds_connection *conn, struct rdma_conn_param *conn_param, struct rds_iw_connect_private *dp, u32 protocol_version) { struct rds_iw_connection *ic = conn->c_transport_data; memset(conn_param, 0, sizeof(struct rdma_conn_param)); /* XXX tune these? */ conn_param->responder_resources = 1; conn_param->initiator_depth = 1; if (dp) { memset(dp, 0, sizeof(*dp)); dp->dp_saddr = conn->c_laddr; dp->dp_daddr = conn->c_faddr; dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS); dp->dp_ack_seq = rds_iw_piggyb_ack(ic); /* Advertise flow control */ if (ic->i_flowctl) { unsigned int credits; credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); dp->dp_credit = cpu_to_be32(credits); atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); } conn_param->private_data = dp; conn_param->private_data_len = sizeof(*dp); } } static void rds_iw_cq_event_handler(struct ib_event *event, void *data) { rdsdebug("event %u data %p\n", event->event, data); } static void rds_iw_qp_event_handler(struct ib_event *event, void *data) { struct rds_connection *conn = data; struct rds_iw_connection *ic = conn->c_transport_data; rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event); switch (event->event) { case IB_EVENT_COMM_EST: rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); break; case IB_EVENT_QP_REQ_ERR: case IB_EVENT_QP_FATAL: default: rdsdebug("Fatal QP Event %u " "- connection %pI4->%pI4, reconnecting\n", event->event, &conn->c_laddr, &conn->c_faddr); rds_conn_drop(conn); break; } } /* * Create a QP */ static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr, struct rds_iw_device *rds_iwdev, struct rds_iw_work_ring *send_ring, void (*send_cq_handler)(struct ib_cq *, void *), struct rds_iw_work_ring *recv_ring, void (*recv_cq_handler)(struct ib_cq *, void *), void *context) { struct ib_device *dev = rds_iwdev->dev; unsigned int send_size, recv_size; int ret; /* The offset of 1 is to accommodate the additional ACK WR. */ send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1); recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1); rds_iw_ring_resize(send_ring, send_size - 1); rds_iw_ring_resize(recv_ring, recv_size - 1); memset(attr, 0, sizeof(*attr)); attr->event_handler = rds_iw_qp_event_handler; attr->qp_context = context; attr->cap.max_send_wr = send_size; attr->cap.max_recv_wr = recv_size; attr->cap.max_send_sge = rds_iwdev->max_sge; attr->cap.max_recv_sge = RDS_IW_RECV_SGE; attr->sq_sig_type = IB_SIGNAL_REQ_WR; attr->qp_type = IB_QPT_RC; attr->send_cq = ib_create_cq(dev, send_cq_handler, rds_iw_cq_event_handler, context, send_size, 0); if (IS_ERR(attr->send_cq)) { ret = PTR_ERR(attr->send_cq); attr->send_cq = NULL; rdsdebug("ib_create_cq send failed: %d\n", ret); goto out; } attr->recv_cq = ib_create_cq(dev, recv_cq_handler, rds_iw_cq_event_handler, context, recv_size, 0); if (IS_ERR(attr->recv_cq)) { ret = PTR_ERR(attr->recv_cq); attr->recv_cq = NULL; rdsdebug("ib_create_cq send failed: %d\n", ret); goto out; } ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP); if (ret) { rdsdebug("ib_req_notify_cq send failed: %d\n", ret); goto out; } ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED); if (ret) { rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); goto out; } out: if (ret) { if (attr->send_cq) ib_destroy_cq(attr->send_cq); if (attr->recv_cq) ib_destroy_cq(attr->recv_cq); } return ret; } /* * This needs to be very careful to not leave IS_ERR pointers around for * cleanup to trip over. */ static int rds_iw_setup_qp(struct rds_connection *conn) { struct rds_iw_connection *ic = conn->c_transport_data; struct ib_device *dev = ic->i_cm_id->device; struct ib_qp_init_attr attr; struct rds_iw_device *rds_iwdev; int ret; /* rds_iw_add_one creates a rds_iw_device object per IB device, * and allocates a protection domain, memory range and MR pool * for each. If that fails for any reason, it will not register * the rds_iwdev at all. */ rds_iwdev = ib_get_client_data(dev, &rds_iw_client); if (!rds_iwdev) { printk_ratelimited(KERN_NOTICE "RDS/IW: No client_data for device %s\n", dev->name); return -EOPNOTSUPP; } /* Protection domain and memory range */ ic->i_pd = rds_iwdev->pd; ic->i_mr = rds_iwdev->mr; ret = rds_iw_init_qp_attrs(&attr, rds_iwdev, &ic->i_send_ring, rds_iw_send_cq_comp_handler, &ic->i_recv_ring, rds_iw_recv_cq_comp_handler, conn); if (ret < 0) goto out; ic->i_send_cq = attr.send_cq; ic->i_recv_cq = attr.recv_cq; /* * XXX this can fail if max_*_wr is too large? Are we supposed * to back off until we get a value that the hardware can support? */ ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); if (ret) { rdsdebug("rdma_create_qp failed: %d\n", ret); goto out; } ic->i_send_hdrs = ib_dma_alloc_coherent(dev, ic->i_send_ring.w_nr * sizeof(struct rds_header), &ic->i_send_hdrs_dma, GFP_KERNEL); if (!ic->i_send_hdrs) { ret = -ENOMEM; rdsdebug("ib_dma_alloc_coherent send failed\n"); goto out; } ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, ic->i_recv_ring.w_nr * sizeof(struct rds_header), &ic->i_recv_hdrs_dma, GFP_KERNEL); if (!ic->i_recv_hdrs) { ret = -ENOMEM; rdsdebug("ib_dma_alloc_coherent recv failed\n"); goto out; } ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), &ic->i_ack_dma, GFP_KERNEL); if (!ic->i_ack) { ret = -ENOMEM; rdsdebug("ib_dma_alloc_coherent ack failed\n"); goto out; } ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work)); if (!ic->i_sends) { ret = -ENOMEM; rdsdebug("send allocation failed\n"); goto out; } rds_iw_send_init_ring(ic); ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work)); if (!ic->i_recvs) { ret = -ENOMEM; rdsdebug("recv allocation failed\n"); goto out; } rds_iw_recv_init_ring(ic); rds_iw_recv_init_ack(ic); /* Post receive buffers - as a side effect, this will update * the posted credit count. */ rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1); rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr, ic->i_send_cq, ic->i_recv_cq); out: return ret; } static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp) { u16 common; u32 version = 0; /* rdma_cm private data is odd - when there is any private data in the * request, we will be given a pretty large buffer without telling us the * original size. The only way to tell the difference is by looking at * the contents, which are initialized to zero. * If the protocol version fields aren't set, this is a connection attempt * from an older version. This could could be 3.0 or 2.0 - we can't tell. * We really should have changed this for OFED 1.3 :-( */ if (dp->dp_protocol_major == 0) return RDS_PROTOCOL_3_0; common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS; if (dp->dp_protocol_major == 3 && common) { version = RDS_PROTOCOL_3_0; while ((common >>= 1) != 0) version++; } printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using " "incompatible protocol version %u.%u\n", &dp->dp_saddr, dp->dp_protocol_major, dp->dp_protocol_minor); return version; } int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id, struct rdma_cm_event *event) { const struct rds_iw_connect_private *dp = event->param.conn.private_data; struct rds_iw_connect_private dp_rep; struct rds_connection *conn = NULL; struct rds_iw_connection *ic = NULL; struct rdma_conn_param conn_param; struct rds_iw_device *rds_iwdev; u32 version; int err, destroy = 1; /* Check whether the remote protocol version matches ours. */ version = rds_iw_protocol_compatible(dp); if (!version) goto out; rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n", &dp->dp_saddr, &dp->dp_daddr, RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version)); conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport, GFP_KERNEL); if (IS_ERR(conn)) { rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); conn = NULL; goto out; } /* * The connection request may occur while the * previous connection exist, e.g. in case of failover. * But as connections may be initiated simultaneously * by both hosts, we have a random backoff mechanism - * see the comment above rds_queue_reconnect() */ mutex_lock(&conn->c_cm_lock); if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { if (rds_conn_state(conn) == RDS_CONN_UP) { rdsdebug("incoming connect while connecting\n"); rds_conn_drop(conn); rds_iw_stats_inc(s_iw_listen_closed_stale); } else if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { /* Wait and see - our connect may still be succeeding */ rds_iw_stats_inc(s_iw_connect_raced); } mutex_unlock(&conn->c_cm_lock); goto out; } ic = conn->c_transport_data; rds_iw_set_protocol(conn, version); rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); /* If the peer gave us the last packet it saw, process this as if * we had received a regular ACK. */ if (dp->dp_ack_seq) rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); BUG_ON(cm_id->context); BUG_ON(ic->i_cm_id); ic->i_cm_id = cm_id; cm_id->context = conn; rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client); ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey; /* We got halfway through setting up the ib_connection, if we * fail now, we have to take the long route out of this mess. */ destroy = 0; err = rds_iw_setup_qp(conn); if (err) { rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err); mutex_unlock(&conn->c_cm_lock); goto out; } rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version); /* rdma_accept() calls rdma_reject() internally if it fails */ err = rdma_accept(cm_id, &conn_param); mutex_unlock(&conn->c_cm_lock); if (err) { rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err); goto out; } return 0; out: rdma_reject(cm_id, NULL, 0); return destroy; } int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id) { struct rds_connection *conn = cm_id->context; struct rds_iw_connection *ic = conn->c_transport_data; struct rdma_conn_param conn_param; struct rds_iw_connect_private dp; int ret; /* If the peer doesn't do protocol negotiation, we must * default to RDSv3.0 */ rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0); ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */ ret = rds_iw_setup_qp(conn); if (ret) { rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret); goto out; } rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION); ret = rdma_connect(cm_id, &conn_param); if (ret) rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret); out: /* Beware - returning non-zero tells the rdma_cm to destroy * the cm_id. We should certainly not do it as long as we still * "own" the cm_id. */ if (ret) { struct rds_iw_connection *ic = conn->c_transport_data; if (ic->i_cm_id == cm_id) ret = 0; } return ret; } int rds_iw_conn_connect(struct rds_connection *conn) { struct rds_iw_connection *ic = conn->c_transport_data; struct rds_iw_device *rds_iwdev; struct sockaddr_in src, dest; int ret; /* XXX I wonder what affect the port space has */ /* delegate cm event handler to rdma_transport */ ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(ic->i_cm_id)) { ret = PTR_ERR(ic->i_cm_id); ic->i_cm_id = NULL; rdsdebug("rdma_create_id() failed: %d\n", ret); goto out; } rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); src.sin_family = AF_INET; src.sin_addr.s_addr = (__force u32)conn->c_laddr; src.sin_port = (__force u16)htons(0); /* First, bind to the local address and device. */ ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src); if (ret) { rdsdebug("rdma_bind_addr(%pI4) failed: %d\n", &conn->c_laddr, ret); rdma_destroy_id(ic->i_cm_id); ic->i_cm_id = NULL; goto out; } rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey; dest.sin_family = AF_INET; dest.sin_addr.s_addr = (__force u32)conn->c_faddr; dest.sin_port = (__force u16)htons(RDS_PORT); ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, (struct sockaddr *)&dest, RDS_RDMA_RESOLVE_TIMEOUT_MS); if (ret) { rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, ret); rdma_destroy_id(ic->i_cm_id); ic->i_cm_id = NULL; } out: return ret; } /* * This is so careful about only cleaning up resources that were built up * so that it can be called at any point during startup. In fact it * can be called multiple times for a given connection. */ void rds_iw_conn_shutdown(struct rds_connection *conn) { struct rds_iw_connection *ic = conn->c_transport_data; int err = 0; struct ib_qp_attr qp_attr; rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, ic->i_pd, ic->i_send_cq, ic->i_recv_cq, ic->i_cm_id ? ic->i_cm_id->qp : NULL); if (ic->i_cm_id) { struct ib_device *dev = ic->i_cm_id->device; rdsdebug("disconnecting cm %p\n", ic->i_cm_id); err = rdma_disconnect(ic->i_cm_id); if (err) { /* Actually this may happen quite frequently, when * an outgoing connect raced with an incoming connect. */ rdsdebug("rds_iw_conn_shutdown: failed to disconnect," " cm: %p err %d\n", ic->i_cm_id, err); } if (ic->i_cm_id->qp) { qp_attr.qp_state = IB_QPS_ERR; ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); } wait_event(rds_iw_ring_empty_wait, rds_iw_ring_empty(&ic->i_send_ring) && rds_iw_ring_empty(&ic->i_recv_ring)); if (ic->i_send_hdrs) ib_dma_free_coherent(dev, ic->i_send_ring.w_nr * sizeof(struct rds_header), ic->i_send_hdrs, ic->i_send_hdrs_dma); if (ic->i_recv_hdrs) ib_dma_free_coherent(dev, ic->i_recv_ring.w_nr * sizeof(struct rds_header), ic->i_recv_hdrs, ic->i_recv_hdrs_dma); if (ic->i_ack) ib_dma_free_coherent(dev, sizeof(struct rds_header), ic->i_ack, ic->i_ack_dma); if (ic->i_sends) rds_iw_send_clear_ring(ic); if (ic->i_recvs) rds_iw_recv_clear_ring(ic); if (ic->i_cm_id->qp) rdma_destroy_qp(ic->i_cm_id); if (ic->i_send_cq) ib_destroy_cq(ic->i_send_cq); if (ic->i_recv_cq) ib_destroy_cq(ic->i_recv_cq); /* * If associated with an rds_iw_device: * Move connection back to the nodev list. * Remove cm_id from the device cm_id list. */ if (ic->rds_iwdev) rds_iw_remove_conn(ic->rds_iwdev, conn); rdma_destroy_id(ic->i_cm_id); ic->i_cm_id = NULL; ic->i_pd = NULL; ic->i_mr = NULL; ic->i_send_cq = NULL; ic->i_recv_cq = NULL; ic->i_send_hdrs = NULL; ic->i_recv_hdrs = NULL; ic->i_ack = NULL; } BUG_ON(ic->rds_iwdev); /* Clear pending transmit */ if (ic->i_rm) { rds_message_put(ic->i_rm); ic->i_rm = NULL; } /* Clear the ACK state */ clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); #ifdef KERNEL_HAS_ATOMIC64 atomic64_set(&ic->i_ack_next, 0); #else ic->i_ack_next = 0; #endif ic->i_ack_recv = 0; /* Clear flow control state */ ic->i_flowctl = 0; atomic_set(&ic->i_credits, 0); rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr); rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr); if (ic->i_iwinc) { rds_inc_put(&ic->i_iwinc->ii_inc); ic->i_iwinc = NULL; } vfree(ic->i_sends); ic->i_sends = NULL; vfree(ic->i_recvs); ic->i_recvs = NULL; rdsdebug("shutdown complete\n"); } int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp) { struct rds_iw_connection *ic; unsigned long flags; /* XXX too lazy? */ ic = kzalloc(sizeof(struct rds_iw_connection), GFP_KERNEL); if (!ic) return -ENOMEM; INIT_LIST_HEAD(&ic->iw_node); tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn, (unsigned long) ic); mutex_init(&ic->i_recv_mutex); #ifndef KERNEL_HAS_ATOMIC64 spin_lock_init(&ic->i_ack_lock); #endif /* * rds_iw_conn_shutdown() waits for these to be emptied so they * must be initialized before it can be called. */ rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr); rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr); ic->conn = conn; conn->c_transport_data = ic; spin_lock_irqsave(&iw_nodev_conns_lock, flags); list_add_tail(&ic->iw_node, &iw_nodev_conns); spin_unlock_irqrestore(&iw_nodev_conns_lock, flags); rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); return 0; } /* * Free a connection. Connection must be shut down and not set for reconnect. */ void rds_iw_conn_free(void *arg) { struct rds_iw_connection *ic = arg; spinlock_t *lock_ptr; rdsdebug("ic %p\n", ic); /* * Conn is either on a dev's list or on the nodev list. * A race with shutdown() or connect() would cause problems * (since rds_iwdev would change) but that should never happen. */ lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock; spin_lock_irq(lock_ptr); list_del(&ic->iw_node); spin_unlock_irq(lock_ptr); kfree(ic); } /* * An error occurred on the connection */ void __rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...) { va_list ap; rds_conn_drop(conn); va_start(ap, fmt); vprintk(fmt, ap); va_end(ap); }