// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* * Copyright (c) 2015-2018 Oracle. All rights reserved. * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. * Copyright (c) 2005-2007 Network Appliance, Inc. 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 BSD-type * 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. * * Neither the name of the Network Appliance, Inc. nor the names of * its contributors may be used to endorse or promote products * derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Author: Tom Tucker */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "xprt_rdma.h" #include #define RPCDBG_FACILITY RPCDBG_SVCXPRT static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, struct net *net); static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, struct net *net, struct sockaddr *sa, int salen, int flags); static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); static void svc_rdma_release_rqst(struct svc_rqst *); static void svc_rdma_detach(struct svc_xprt *xprt); static void svc_rdma_free(struct svc_xprt *xprt); static int svc_rdma_has_wspace(struct svc_xprt *xprt); static void svc_rdma_secure_port(struct svc_rqst *); static void svc_rdma_kill_temp_xprt(struct svc_xprt *); static const struct svc_xprt_ops svc_rdma_ops = { .xpo_create = svc_rdma_create, .xpo_recvfrom = svc_rdma_recvfrom, .xpo_sendto = svc_rdma_sendto, .xpo_release_rqst = svc_rdma_release_rqst, .xpo_detach = svc_rdma_detach, .xpo_free = svc_rdma_free, .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, .xpo_has_wspace = svc_rdma_has_wspace, .xpo_accept = svc_rdma_accept, .xpo_secure_port = svc_rdma_secure_port, .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt, }; struct svc_xprt_class svc_rdma_class = { .xcl_name = "rdma", .xcl_owner = THIS_MODULE, .xcl_ops = &svc_rdma_ops, .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, .xcl_ident = XPRT_TRANSPORT_RDMA, }; #if defined(CONFIG_SUNRPC_BACKCHANNEL) static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *, struct sockaddr *, int, int); static void svc_rdma_bc_detach(struct svc_xprt *); static void svc_rdma_bc_free(struct svc_xprt *); static const struct svc_xprt_ops svc_rdma_bc_ops = { .xpo_create = svc_rdma_bc_create, .xpo_detach = svc_rdma_bc_detach, .xpo_free = svc_rdma_bc_free, .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, .xpo_secure_port = svc_rdma_secure_port, }; struct svc_xprt_class svc_rdma_bc_class = { .xcl_name = "rdma-bc", .xcl_owner = THIS_MODULE, .xcl_ops = &svc_rdma_bc_ops, .xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN) }; static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv, struct net *net, struct sockaddr *sa, int salen, int flags) { struct svcxprt_rdma *cma_xprt; struct svc_xprt *xprt; cma_xprt = svc_rdma_create_xprt(serv, net); if (!cma_xprt) return ERR_PTR(-ENOMEM); xprt = &cma_xprt->sc_xprt; svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv); set_bit(XPT_CONG_CTRL, &xprt->xpt_flags); serv->sv_bc_xprt = xprt; dprintk("svcrdma: %s(%p)\n", __func__, xprt); return xprt; } static void svc_rdma_bc_detach(struct svc_xprt *xprt) { dprintk("svcrdma: %s(%p)\n", __func__, xprt); } static void svc_rdma_bc_free(struct svc_xprt *xprt) { struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); dprintk("svcrdma: %s(%p)\n", __func__, xprt); if (xprt) kfree(rdma); } #endif /* CONFIG_SUNRPC_BACKCHANNEL */ /* QP event handler */ static void qp_event_handler(struct ib_event *event, void *context) { struct svc_xprt *xprt = context; trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); switch (event->event) { /* These are considered benign events */ case IB_EVENT_PATH_MIG: case IB_EVENT_COMM_EST: case IB_EVENT_SQ_DRAINED: case IB_EVENT_QP_LAST_WQE_REACHED: break; /* These are considered fatal events */ case IB_EVENT_PATH_MIG_ERR: case IB_EVENT_QP_FATAL: case IB_EVENT_QP_REQ_ERR: case IB_EVENT_QP_ACCESS_ERR: case IB_EVENT_DEVICE_FATAL: default: set_bit(XPT_CLOSE, &xprt->xpt_flags); svc_xprt_enqueue(xprt); break; } } static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, struct net *net) { struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); if (!cma_xprt) { dprintk("svcrdma: failed to create new transport\n"); return NULL; } svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); INIT_LIST_HEAD(&cma_xprt->sc_accept_q); INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts); INIT_LIST_HEAD(&cma_xprt->sc_recv_ctxts); INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts); init_waitqueue_head(&cma_xprt->sc_send_wait); spin_lock_init(&cma_xprt->sc_lock); spin_lock_init(&cma_xprt->sc_rq_dto_lock); spin_lock_init(&cma_xprt->sc_send_lock); spin_lock_init(&cma_xprt->sc_recv_lock); spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); /* * Note that this implies that the underlying transport support * has some form of congestion control (see RFC 7530 section 3.1 * paragraph 2). For now, we assume that all supported RDMA * transports are suitable here. */ set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); return cma_xprt; } static void svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, struct rdma_conn_param *param) { const struct rpcrdma_connect_private *pmsg = param->private_data; if (pmsg && pmsg->cp_magic == rpcrdma_cmp_magic && pmsg->cp_version == RPCRDMA_CMP_VERSION) { newxprt->sc_snd_w_inv = pmsg->cp_flags & RPCRDMA_CMP_F_SND_W_INV_OK; dprintk("svcrdma: client send_size %u, recv_size %u " "remote inv %ssupported\n", rpcrdma_decode_buffer_size(pmsg->cp_send_size), rpcrdma_decode_buffer_size(pmsg->cp_recv_size), newxprt->sc_snd_w_inv ? "" : "un"); } } /* * This function handles the CONNECT_REQUEST event on a listening * endpoint. It is passed the cma_id for the _new_ connection. The context in * this cma_id is inherited from the listening cma_id and is the svc_xprt * structure for the listening endpoint. * * This function creates a new xprt for the new connection and enqueues it on * the accept queue for the listent xprt. When the listen thread is kicked, it * will call the recvfrom method on the listen xprt which will accept the new * connection. */ static void handle_connect_req(struct rdma_cm_id *new_cma_id, struct rdma_conn_param *param) { struct svcxprt_rdma *listen_xprt = new_cma_id->context; struct svcxprt_rdma *newxprt; struct sockaddr *sa; /* Create a new transport */ newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, listen_xprt->sc_xprt.xpt_net); if (!newxprt) return; newxprt->sc_cm_id = new_cma_id; new_cma_id->context = newxprt; svc_rdma_parse_connect_private(newxprt, param); /* Save client advertised inbound read limit for use later in accept. */ newxprt->sc_ord = param->initiator_depth; /* Set the local and remote addresses in the transport */ sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); /* * Enqueue the new transport on the accept queue of the listening * transport */ spin_lock_bh(&listen_xprt->sc_lock); list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); spin_unlock_bh(&listen_xprt->sc_lock); set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); svc_xprt_enqueue(&listen_xprt->sc_xprt); } /* * Handles events generated on the listening endpoint. These events will be * either be incoming connect requests or adapter removal events. */ static int rdma_listen_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.src_addr; trace_svcrdma_cm_event(event, sap); switch (event->event) { case RDMA_CM_EVENT_CONNECT_REQUEST: dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " "event = %s (%d)\n", cma_id, cma_id->context, rdma_event_msg(event->event), event->event); handle_connect_req(cma_id, &event->param.conn); break; default: /* NB: No device removal upcall for INADDR_ANY listeners */ dprintk("svcrdma: Unexpected event on listening endpoint %p, " "event = %s (%d)\n", cma_id, rdma_event_msg(event->event), event->event); break; } return 0; } static int rdma_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.dst_addr; struct svcxprt_rdma *rdma = cma_id->context; struct svc_xprt *xprt = &rdma->sc_xprt; trace_svcrdma_cm_event(event, sap); switch (event->event) { case RDMA_CM_EVENT_ESTABLISHED: /* Accept complete */ svc_xprt_get(xprt); dprintk("svcrdma: Connection completed on DTO xprt=%p, " "cm_id=%p\n", xprt, cma_id); clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); svc_xprt_enqueue(xprt); break; case RDMA_CM_EVENT_DISCONNECTED: dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", xprt, cma_id); set_bit(XPT_CLOSE, &xprt->xpt_flags); svc_xprt_enqueue(xprt); svc_xprt_put(xprt); break; case RDMA_CM_EVENT_DEVICE_REMOVAL: dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " "event = %s (%d)\n", cma_id, xprt, rdma_event_msg(event->event), event->event); set_bit(XPT_CLOSE, &xprt->xpt_flags); svc_xprt_enqueue(xprt); svc_xprt_put(xprt); break; default: dprintk("svcrdma: Unexpected event on DTO endpoint %p, " "event = %s (%d)\n", cma_id, rdma_event_msg(event->event), event->event); break; } return 0; } /* * Create a listening RDMA service endpoint. */ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, struct net *net, struct sockaddr *sa, int salen, int flags) { struct rdma_cm_id *listen_id; struct svcxprt_rdma *cma_xprt; int ret; dprintk("svcrdma: Creating RDMA listener\n"); if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) { dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); return ERR_PTR(-EAFNOSUPPORT); } cma_xprt = svc_rdma_create_xprt(serv, net); if (!cma_xprt) return ERR_PTR(-ENOMEM); set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); listen_id = rdma_create_id(net, rdma_listen_handler, cma_xprt, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(listen_id)) { ret = PTR_ERR(listen_id); dprintk("svcrdma: rdma_create_id failed = %d\n", ret); goto err0; } /* Allow both IPv4 and IPv6 sockets to bind a single port * at the same time. */ #if IS_ENABLED(CONFIG_IPV6) ret = rdma_set_afonly(listen_id, 1); if (ret) { dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret); goto err1; } #endif ret = rdma_bind_addr(listen_id, sa); if (ret) { dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); goto err1; } cma_xprt->sc_cm_id = listen_id; ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); if (ret) { dprintk("svcrdma: rdma_listen failed = %d\n", ret); goto err1; } /* * We need to use the address from the cm_id in case the * caller specified 0 for the port number. */ sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); return &cma_xprt->sc_xprt; err1: rdma_destroy_id(listen_id); err0: kfree(cma_xprt); return ERR_PTR(ret); } /* * This is the xpo_recvfrom function for listening endpoints. Its * purpose is to accept incoming connections. The CMA callback handler * has already created a new transport and attached it to the new CMA * ID. * * There is a queue of pending connections hung on the listening * transport. This queue contains the new svc_xprt structure. This * function takes svc_xprt structures off the accept_q and completes * the connection. */ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) { struct svcxprt_rdma *listen_rdma; struct svcxprt_rdma *newxprt = NULL; struct rdma_conn_param conn_param; struct rpcrdma_connect_private pmsg; struct ib_qp_init_attr qp_attr; unsigned int ctxts, rq_depth; struct ib_device *dev; struct sockaddr *sap; int ret = 0; listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); clear_bit(XPT_CONN, &xprt->xpt_flags); /* Get the next entry off the accept list */ spin_lock_bh(&listen_rdma->sc_lock); if (!list_empty(&listen_rdma->sc_accept_q)) { newxprt = list_entry(listen_rdma->sc_accept_q.next, struct svcxprt_rdma, sc_accept_q); list_del_init(&newxprt->sc_accept_q); } if (!list_empty(&listen_rdma->sc_accept_q)) set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); spin_unlock_bh(&listen_rdma->sc_lock); if (!newxprt) return NULL; dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", newxprt, newxprt->sc_cm_id); dev = newxprt->sc_cm_id->device; newxprt->sc_port_num = newxprt->sc_cm_id->port_num; /* Qualify the transport resource defaults with the * capabilities of this particular device */ newxprt->sc_max_send_sges = dev->attrs.max_send_sge; /* transport hdr, head iovec, one page list entry, tail iovec */ if (newxprt->sc_max_send_sges < 4) { pr_err("svcrdma: too few Send SGEs available (%d)\n", newxprt->sc_max_send_sges); goto errout; } newxprt->sc_max_req_size = svcrdma_max_req_size; newxprt->sc_max_requests = svcrdma_max_requests; newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests; if (rq_depth > dev->attrs.max_qp_wr) { pr_warn("svcrdma: reducing receive depth to %d\n", dev->attrs.max_qp_wr); rq_depth = dev->attrs.max_qp_wr; newxprt->sc_max_requests = rq_depth - 2; newxprt->sc_max_bc_requests = 2; } newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES); ctxts *= newxprt->sc_max_requests; newxprt->sc_sq_depth = rq_depth + ctxts; if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) { pr_warn("svcrdma: reducing send depth to %d\n", dev->attrs.max_qp_wr); newxprt->sc_sq_depth = dev->attrs.max_qp_wr; } atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); newxprt->sc_pd = ib_alloc_pd(dev, 0); if (IS_ERR(newxprt->sc_pd)) { dprintk("svcrdma: error creating PD for connect request\n"); goto errout; } newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth, 0, IB_POLL_WORKQUEUE); if (IS_ERR(newxprt->sc_sq_cq)) { dprintk("svcrdma: error creating SQ CQ for connect request\n"); goto errout; } newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, rq_depth, 0, IB_POLL_WORKQUEUE); if (IS_ERR(newxprt->sc_rq_cq)) { dprintk("svcrdma: error creating RQ CQ for connect request\n"); goto errout; } memset(&qp_attr, 0, sizeof qp_attr); qp_attr.event_handler = qp_event_handler; qp_attr.qp_context = &newxprt->sc_xprt; qp_attr.port_num = newxprt->sc_port_num; qp_attr.cap.max_rdma_ctxs = ctxts; qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; qp_attr.cap.max_recv_wr = rq_depth; qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; qp_attr.cap.max_recv_sge = 1; qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; qp_attr.qp_type = IB_QPT_RC; qp_attr.send_cq = newxprt->sc_sq_cq; qp_attr.recv_cq = newxprt->sc_rq_cq; dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n", newxprt->sc_cm_id, newxprt->sc_pd); dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); if (ret) { dprintk("svcrdma: failed to create QP, ret=%d\n", ret); goto errout; } newxprt->sc_qp = newxprt->sc_cm_id->qp; if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) newxprt->sc_snd_w_inv = false; if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) && !rdma_ib_or_roce(dev, newxprt->sc_port_num)) goto errout; if (!svc_rdma_post_recvs(newxprt)) goto errout; /* Swap out the handler */ newxprt->sc_cm_id->event_handler = rdma_cma_handler; /* Construct RDMA-CM private message */ pmsg.cp_magic = rpcrdma_cmp_magic; pmsg.cp_version = RPCRDMA_CMP_VERSION; pmsg.cp_flags = 0; pmsg.cp_send_size = pmsg.cp_recv_size = rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); /* Accept Connection */ set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); memset(&conn_param, 0, sizeof conn_param); conn_param.responder_resources = 0; conn_param.initiator_depth = min_t(int, newxprt->sc_ord, dev->attrs.max_qp_init_rd_atom); if (!conn_param.initiator_depth) { dprintk("svcrdma: invalid ORD setting\n"); ret = -EINVAL; goto errout; } conn_param.private_data = &pmsg; conn_param.private_data_len = sizeof(pmsg); ret = rdma_accept(newxprt->sc_cm_id, &conn_param); if (ret) goto errout; dprintk("svcrdma: new connection %p accepted:\n", newxprt); sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); dprintk(" rdma_rw_ctxs : %d\n", ctxts); dprintk(" max_requests : %d\n", newxprt->sc_max_requests); dprintk(" ord : %d\n", conn_param.initiator_depth); trace_svcrdma_xprt_accept(&newxprt->sc_xprt); return &newxprt->sc_xprt; errout: dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); trace_svcrdma_xprt_fail(&newxprt->sc_xprt); /* Take a reference in case the DTO handler runs */ svc_xprt_get(&newxprt->sc_xprt); if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) ib_destroy_qp(newxprt->sc_qp); rdma_destroy_id(newxprt->sc_cm_id); /* This call to put will destroy the transport */ svc_xprt_put(&newxprt->sc_xprt); return NULL; } static void svc_rdma_release_rqst(struct svc_rqst *rqstp) { } /* * When connected, an svc_xprt has at least two references: * * - A reference held by the cm_id between the ESTABLISHED and * DISCONNECTED events. If the remote peer disconnected first, this * reference could be gone. * * - A reference held by the svc_recv code that called this function * as part of close processing. * * At a minimum one references should still be held. */ static void svc_rdma_detach(struct svc_xprt *xprt) { struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); /* Disconnect and flush posted WQE */ rdma_disconnect(rdma->sc_cm_id); } static void __svc_rdma_free(struct work_struct *work) { struct svcxprt_rdma *rdma = container_of(work, struct svcxprt_rdma, sc_work); struct svc_xprt *xprt = &rdma->sc_xprt; trace_svcrdma_xprt_free(xprt); if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) ib_drain_qp(rdma->sc_qp); /* We should only be called from kref_put */ if (kref_read(&xprt->xpt_ref) != 0) pr_err("svcrdma: sc_xprt still in use? (%d)\n", kref_read(&xprt->xpt_ref)); svc_rdma_flush_recv_queues(rdma); /* Final put of backchannel client transport */ if (xprt->xpt_bc_xprt) { xprt_put(xprt->xpt_bc_xprt); xprt->xpt_bc_xprt = NULL; } svc_rdma_destroy_rw_ctxts(rdma); svc_rdma_send_ctxts_destroy(rdma); svc_rdma_recv_ctxts_destroy(rdma); /* Destroy the QP if present (not a listener) */ if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) ib_destroy_qp(rdma->sc_qp); if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) ib_free_cq(rdma->sc_sq_cq); if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) ib_free_cq(rdma->sc_rq_cq); if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) ib_dealloc_pd(rdma->sc_pd); /* Destroy the CM ID */ rdma_destroy_id(rdma->sc_cm_id); kfree(rdma); } static void svc_rdma_free(struct svc_xprt *xprt) { struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); INIT_WORK(&rdma->sc_work, __svc_rdma_free); queue_work(svc_rdma_wq, &rdma->sc_work); } static int svc_rdma_has_wspace(struct svc_xprt *xprt) { struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); /* * If there are already waiters on the SQ, * return false. */ if (waitqueue_active(&rdma->sc_send_wait)) return 0; /* Otherwise return true. */ return 1; } static void svc_rdma_secure_port(struct svc_rqst *rqstp) { set_bit(RQ_SECURE, &rqstp->rq_flags); } static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) { }