| /* |
| * 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/vmalloc.h> |
| |
| #include "rds.h" |
| #include "ib.h" |
| |
| /* |
| * Set the selected protocol version |
| */ |
| static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version) |
| { |
| conn->c_version = version; |
| } |
| |
| /* |
| * Set up flow control |
| */ |
| static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits) |
| { |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| |
| if (rds_ib_sysctl_flow_control && credits != 0) { |
| /* We're doing flow control */ |
| ic->i_flowctl = 1; |
| rds_ib_send_add_credits(conn, credits); |
| } else { |
| ic->i_flowctl = 0; |
| } |
| } |
| |
| /* |
| * Tune RNR behavior. Without flow control, we use a rather |
| * low timeout, but not the absolute minimum - this should |
| * be tunable. |
| * |
| * We already set the RNR retry count to 7 (which is the |
| * smallest infinite number :-) above. |
| * If flow control is off, we want to change this back to 0 |
| * so that we learn quickly when our credit accounting is |
| * buggy. |
| * |
| * Caller passes in a qp_attr pointer - don't waste stack spacv |
| * by allocation this twice. |
| */ |
| static void |
| rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr) |
| { |
| int ret; |
| |
| attr->min_rnr_timer = IB_RNR_TIMER_000_32; |
| ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER); |
| if (ret) |
| printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret); |
| } |
| |
| /* |
| * Connection established. |
| * We get here for both outgoing and incoming connection. |
| */ |
| void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) |
| { |
| const struct rds_ib_connect_private *dp = NULL; |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| struct rds_ib_device *rds_ibdev; |
| struct ib_qp_attr qp_attr; |
| int err; |
| |
| if (event->param.conn.private_data_len >= sizeof(*dp)) { |
| dp = event->param.conn.private_data; |
| |
| /* make sure it isn't empty data */ |
| if (dp->dp_protocol_major) { |
| rds_ib_set_protocol(conn, |
| RDS_PROTOCOL(dp->dp_protocol_major, |
| dp->dp_protocol_minor)); |
| rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); |
| } |
| } |
| |
| printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", |
| &conn->c_faddr, |
| RDS_PROTOCOL_MAJOR(conn->c_version), |
| RDS_PROTOCOL_MINOR(conn->c_version), |
| ic->i_flowctl ? ", flow control" : ""); |
| |
| /* |
| * Init rings and fill recv. this needs to wait until protocol negotiation |
| * is complete, since ring layout is different from 3.0 to 3.1. |
| */ |
| rds_ib_send_init_ring(ic); |
| rds_ib_recv_init_ring(ic); |
| /* Post receive buffers - as a side effect, this will update |
| * the posted credit count. */ |
| rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1); |
| |
| /* Tune RNR behavior */ |
| rds_ib_tune_rnr(ic, &qp_attr); |
| |
| qp_attr.qp_state = IB_QPS_RTS; |
| err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); |
| if (err) |
| printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err); |
| |
| /* update ib_device with this local ipaddr & conn */ |
| rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client); |
| err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr); |
| if (err) |
| printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err); |
| rds_ib_add_conn(rds_ibdev, 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); |
| |
| rds_connect_complete(conn); |
| } |
| |
| static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, |
| struct rdma_conn_param *conn_param, |
| struct rds_ib_connect_private *dp, |
| u32 protocol_version) |
| { |
| memset(conn_param, 0, sizeof(struct rdma_conn_param)); |
| /* XXX tune these? */ |
| conn_param->responder_resources = 1; |
| conn_param->initiator_depth = 1; |
| conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7); |
| conn_param->rnr_retry_count = 7; |
| |
| if (dp) { |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| |
| 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_IB_SUPPORTED_PROTOCOLS); |
| dp->dp_ack_seq = rds_ib_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_ib_cq_event_handler(struct ib_event *event, void *data) |
| { |
| rdsdebug("event %u data %p\n", event->event, data); |
| } |
| |
| static void rds_ib_qp_event_handler(struct ib_event *event, void *data) |
| { |
| struct rds_connection *conn = data; |
| struct rds_ib_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; |
| default: |
| printk(KERN_WARNING "RDS/ib: unhandled QP event %u " |
| "on connection to %pI4\n", event->event, |
| &conn->c_faddr); |
| break; |
| } |
| } |
| |
| /* |
| * This needs to be very careful to not leave IS_ERR pointers around for |
| * cleanup to trip over. |
| */ |
| static int rds_ib_setup_qp(struct rds_connection *conn) |
| { |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| struct ib_device *dev = ic->i_cm_id->device; |
| struct ib_qp_init_attr attr; |
| struct rds_ib_device *rds_ibdev; |
| int ret; |
| |
| /* rds_ib_add_one creates a rds_ib_device object per IB device, |
| * and allocates a protection domain, memory range and FMR pool |
| * for each. If that fails for any reason, it will not register |
| * the rds_ibdev at all. |
| */ |
| rds_ibdev = ib_get_client_data(dev, &rds_ib_client); |
| if (rds_ibdev == NULL) { |
| if (printk_ratelimit()) |
| printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n", |
| dev->name); |
| return -EOPNOTSUPP; |
| } |
| |
| if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) |
| rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); |
| if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) |
| rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); |
| |
| /* Protection domain and memory range */ |
| ic->i_pd = rds_ibdev->pd; |
| ic->i_mr = rds_ibdev->mr; |
| |
| ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler, |
| rds_ib_cq_event_handler, conn, |
| ic->i_send_ring.w_nr + 1, 0); |
| if (IS_ERR(ic->i_send_cq)) { |
| ret = PTR_ERR(ic->i_send_cq); |
| ic->i_send_cq = NULL; |
| rdsdebug("ib_create_cq send failed: %d\n", ret); |
| goto out; |
| } |
| |
| ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler, |
| rds_ib_cq_event_handler, conn, |
| ic->i_recv_ring.w_nr, 0); |
| if (IS_ERR(ic->i_recv_cq)) { |
| ret = PTR_ERR(ic->i_recv_cq); |
| ic->i_recv_cq = NULL; |
| rdsdebug("ib_create_cq recv failed: %d\n", ret); |
| goto out; |
| } |
| |
| ret = ib_req_notify_cq(ic->i_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(ic->i_recv_cq, IB_CQ_SOLICITED); |
| if (ret) { |
| rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); |
| goto out; |
| } |
| |
| /* XXX negotiate max send/recv with remote? */ |
| memset(&attr, 0, sizeof(attr)); |
| attr.event_handler = rds_ib_qp_event_handler; |
| attr.qp_context = conn; |
| /* + 1 to allow for the single ack message */ |
| attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1; |
| attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1; |
| attr.cap.max_send_sge = rds_ibdev->max_sge; |
| attr.cap.max_recv_sge = RDS_IB_RECV_SGE; |
| attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| attr.qp_type = IB_QPT_RC; |
| attr.send_cq = ic->i_send_cq; |
| attr.recv_cq = ic->i_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 == NULL) { |
| 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 == NULL) { |
| 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 == NULL) { |
| 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_ib_send_work)); |
| if (ic->i_sends == NULL) { |
| ret = -ENOMEM; |
| rdsdebug("send allocation failed\n"); |
| goto out; |
| } |
| memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work)); |
| |
| ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work)); |
| if (ic->i_recvs == NULL) { |
| ret = -ENOMEM; |
| rdsdebug("recv allocation failed\n"); |
| goto out; |
| } |
| memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work)); |
| |
| rds_ib_recv_init_ack(ic); |
| |
| 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_ib_protocol_compatible(struct rdma_cm_event *event) |
| { |
| const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
| 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 :-( |
| */ |
| |
| /* Be paranoid. RDS always has privdata */ |
| if (!event->param.conn.private_data_len) { |
| printk(KERN_NOTICE "RDS incoming connection has no private data, " |
| "rejecting\n"); |
| return 0; |
| } |
| |
| /* Even if len is crap *now* I still want to check it. -ASG */ |
| if (event->param.conn.private_data_len < sizeof (*dp) |
| || dp->dp_protocol_major == 0) |
| return RDS_PROTOCOL_3_0; |
| |
| common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS; |
| if (dp->dp_protocol_major == 3 && common) { |
| version = RDS_PROTOCOL_3_0; |
| while ((common >>= 1) != 0) |
| version++; |
| } else if (printk_ratelimit()) { |
| printk(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_ib_cm_handle_connect(struct rdma_cm_id *cm_id, |
| struct rdma_cm_event *event) |
| { |
| __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id; |
| __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id; |
| const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
| struct rds_ib_connect_private dp_rep; |
| struct rds_connection *conn = NULL; |
| struct rds_ib_connection *ic = NULL; |
| struct rdma_conn_param conn_param; |
| u32 version; |
| int err, destroy = 1; |
| |
| /* Check whether the remote protocol version matches ours. */ |
| version = rds_ib_protocol_compatible(event); |
| if (!version) |
| goto out; |
| |
| rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid " |
| "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr, |
| RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version), |
| (unsigned long long)be64_to_cpu(lguid), |
| (unsigned long long)be64_to_cpu(fguid)); |
| |
| conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_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_ib_stats_inc(s_ib_listen_closed_stale); |
| } else |
| if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { |
| /* Wait and see - our connect may still be succeeding */ |
| rds_ib_stats_inc(s_ib_connect_raced); |
| } |
| mutex_unlock(&conn->c_cm_lock); |
| goto out; |
| } |
| |
| ic = conn->c_transport_data; |
| |
| rds_ib_set_protocol(conn, version); |
| rds_ib_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; |
| |
| /* 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_ib_setup_qp(conn); |
| if (err) { |
| rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err); |
| goto out; |
| } |
| |
| rds_ib_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_ib_conn_error(conn, "rdma_accept failed (%d)\n", err); |
| goto out; |
| } |
| |
| return 0; |
| |
| out: |
| rdma_reject(cm_id, NULL, 0); |
| return destroy; |
| } |
| |
| |
| int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id) |
| { |
| struct rds_connection *conn = cm_id->context; |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| struct rdma_conn_param conn_param; |
| struct rds_ib_connect_private dp; |
| int ret; |
| |
| /* If the peer doesn't do protocol negotiation, we must |
| * default to RDSv3.0 */ |
| rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0); |
| ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */ |
| |
| ret = rds_ib_setup_qp(conn); |
| if (ret) { |
| rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret); |
| goto out; |
| } |
| |
| rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION); |
| |
| ret = rdma_connect(cm_id, &conn_param); |
| if (ret) |
| rds_ib_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) { |
| if (ic->i_cm_id == cm_id) |
| ret = 0; |
| } |
| return ret; |
| } |
| |
| int rds_ib_conn_connect(struct rds_connection *conn) |
| { |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| 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); |
| 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); |
| |
| 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_ib_conn_shutdown(struct rds_connection *conn) |
| { |
| struct rds_ib_connection *ic = conn->c_transport_data; |
| int err = 0; |
| |
| 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("failed to disconnect, cm: %p err %d\n", |
| ic->i_cm_id, err); |
| } |
| |
| wait_event(rds_ib_ring_empty_wait, |
| rds_ib_ring_empty(&ic->i_send_ring) && |
| rds_ib_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_ib_send_clear_ring(ic); |
| if (ic->i_recvs) |
| rds_ib_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); |
| rdma_destroy_id(ic->i_cm_id); |
| |
| /* |
| * Move connection back to the nodev list. |
| */ |
| if (ic->rds_ibdev) |
| rds_ib_remove_conn(ic->rds_ibdev, conn); |
| |
| 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_ibdev); |
| |
| /* 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_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); |
| rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); |
| |
| if (ic->i_ibinc) { |
| rds_inc_put(&ic->i_ibinc->ii_inc); |
| ic->i_ibinc = NULL; |
| } |
| |
| vfree(ic->i_sends); |
| ic->i_sends = NULL; |
| vfree(ic->i_recvs); |
| ic->i_recvs = NULL; |
| } |
| |
| int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) |
| { |
| struct rds_ib_connection *ic; |
| unsigned long flags; |
| |
| /* XXX too lazy? */ |
| ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL); |
| if (ic == NULL) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&ic->ib_node); |
| mutex_init(&ic->i_recv_mutex); |
| #ifndef KERNEL_HAS_ATOMIC64 |
| spin_lock_init(&ic->i_ack_lock); |
| #endif |
| |
| /* |
| * rds_ib_conn_shutdown() waits for these to be emptied so they |
| * must be initialized before it can be called. |
| */ |
| rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); |
| rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); |
| |
| ic->conn = conn; |
| conn->c_transport_data = ic; |
| |
| spin_lock_irqsave(&ib_nodev_conns_lock, flags); |
| list_add_tail(&ic->ib_node, &ib_nodev_conns); |
| spin_unlock_irqrestore(&ib_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_ib_conn_free(void *arg) |
| { |
| struct rds_ib_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_ibdev would change) but that should never happen. |
| */ |
| lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock; |
| |
| spin_lock_irq(lock_ptr); |
| list_del(&ic->ib_node); |
| spin_unlock_irq(lock_ptr); |
| |
| kfree(ic); |
| } |
| |
| |
| /* |
| * An error occurred on the connection |
| */ |
| void |
| __rds_ib_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); |
| } |