// 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 "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_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_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_result_payload = svc_rdma_result_payload, .xpo_release_ctxt = svc_rdma_release_ctxt, .xpo_detach = svc_rdma_detach, .xpo_free = svc_rdma_free, .xpo_has_wspace = svc_rdma_has_wspace, .xpo_accept = svc_rdma_accept, .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, }; /* 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: svc_xprt_deferred_close(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_llist_head(&cma_xprt->sc_send_ctxts); init_llist_head(&cma_xprt->sc_recv_ctxts); init_llist_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_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; sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; newxprt->sc_xprt.xpt_remotelen = svc_addr_len(sa); memcpy(&newxprt->sc_xprt.xpt_remote, sa, newxprt->sc_xprt.xpt_remotelen); snprintf(newxprt->sc_xprt.xpt_remotebuf, sizeof(newxprt->sc_xprt.xpt_remotebuf) - 1, "%pISc", sa); /* The remote port is arbitrary and not under the control of the * client ULP. Set it to a fixed value so that the DRC continues * to be effective after a reconnect. */ rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0); 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(&listen_xprt->sc_lock); list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); spin_unlock(&listen_xprt->sc_lock); set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); svc_xprt_enqueue(&listen_xprt->sc_xprt); } /** * svc_rdma_listen_handler - Handle CM events generated on a listening endpoint * @cma_id: the server's listener rdma_cm_id * @event: details of the event * * Return values: * %0: Do not destroy @cma_id * %1: Destroy @cma_id (never returned here) * * NB: There is never a DEVICE_REMOVAL event for INADDR_ANY listeners. */ static int svc_rdma_listen_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { switch (event->event) { case RDMA_CM_EVENT_CONNECT_REQUEST: handle_connect_req(cma_id, &event->param.conn); break; default: break; } return 0; } /** * svc_rdma_cma_handler - Handle CM events on client connections * @cma_id: the server's listener rdma_cm_id * @event: details of the event * * Return values: * %0: Do not destroy @cma_id * %1: Destroy @cma_id (never returned here) */ static int svc_rdma_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { struct svcxprt_rdma *rdma = cma_id->context; struct svc_xprt *xprt = &rdma->sc_xprt; switch (event->event) { case RDMA_CM_EVENT_ESTABLISHED: clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); /* Handle any requests that were received while * CONN_PENDING was set. */ svc_xprt_enqueue(xprt); break; case RDMA_CM_EVENT_DISCONNECTED: case RDMA_CM_EVENT_DEVICE_REMOVAL: svc_xprt_deferred_close(xprt); break; default: 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; if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) 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, svc_rdma_listen_handler, cma_xprt, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(listen_id)) { ret = PTR_ERR(listen_id); 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) goto err1; #endif ret = rdma_bind_addr(listen_id, sa); if (ret) goto err1; cma_xprt->sc_cm_id = listen_id; ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); if (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; int ret = 0; RPC_IFDEBUG(struct sockaddr *sap); 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(&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(&listen_rdma->sc_lock); if (!newxprt) return NULL; 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 */ /* Transport header, head iovec, tail iovec */ newxprt->sc_max_send_sges = 3; /* Add one SGE per page list entry */ newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1; if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) newxprt->sc_max_send_sges = dev->attrs.max_send_sge; 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; newxprt->sc_recv_batch = RPCRDMA_MAX_RECV_BATCH; rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests + newxprt->sc_recv_batch; 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_recv_batch = 1; 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)) { trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd)); goto errout; } newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth, IB_POLL_WORKQUEUE); if (IS_ERR(newxprt->sc_sq_cq)) goto errout; newxprt->sc_rq_cq = ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE); if (IS_ERR(newxprt->sc_rq_cq)) 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) { trace_svcrdma_qp_err(newxprt, 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)) { trace_svcrdma_fabric_err(newxprt, -EINVAL); goto errout; } if (!svc_rdma_post_recvs(newxprt)) goto errout; /* 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) { ret = -EINVAL; trace_svcrdma_initdepth_err(newxprt, ret); goto errout; } conn_param.private_data = &pmsg; conn_param.private_data_len = sizeof(pmsg); rdma_lock_handler(newxprt->sc_cm_id); newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler; ret = rdma_accept(newxprt->sc_cm_id, &conn_param); rdma_unlock_handler(newxprt->sc_cm_id); if (ret) { trace_svcrdma_accept_err(newxprt, ret); goto errout; } #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 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); #endif return &newxprt->sc_xprt; errout: /* 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_detach(struct svc_xprt *xprt) { struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); 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); /* This blocks until the Completion Queues are empty */ if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) ib_drain_qp(rdma->sc_qp); svc_rdma_flush_recv_queues(rdma); 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); schedule_work(&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_kill_temp_xprt(struct svc_xprt *xprt) { }