1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2/* 3 * Copyright (c) 2015-2018 Oracle. All rights reserved. 4 * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. 5 * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the BSD-type 11 * license below: 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials provided 23 * with the distribution. 24 * 25 * Neither the name of the Network Appliance, Inc. nor the names of 26 * its contributors may be used to endorse or promote products 27 * derived from this software without specific prior written 28 * permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 * Author: Tom Tucker <tom@opengridcomputing.com> 43 */ 44 45#include <linux/interrupt.h> 46#include <linux/sched.h> 47#include <linux/slab.h> 48#include <linux/spinlock.h> 49#include <linux/workqueue.h> 50#include <linux/export.h> 51 52#include <rdma/ib_verbs.h> 53#include <rdma/rdma_cm.h> 54#include <rdma/rw.h> 55 56#include <linux/sunrpc/addr.h> 57#include <linux/sunrpc/debug.h> 58#include <linux/sunrpc/svc_xprt.h> 59#include <linux/sunrpc/svc_rdma.h> 60 61#include "xprt_rdma.h" 62#include <trace/events/rpcrdma.h> 63 64#define RPCDBG_FACILITY RPCDBG_SVCXPRT 65 66static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 67 struct net *net, int node); 68static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 69 struct net *net, 70 struct sockaddr *sa, int salen, 71 int flags); 72static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); 73static void svc_rdma_detach(struct svc_xprt *xprt); 74static void svc_rdma_free(struct svc_xprt *xprt); 75static int svc_rdma_has_wspace(struct svc_xprt *xprt); 76static void svc_rdma_kill_temp_xprt(struct svc_xprt *); 77 78static const struct svc_xprt_ops svc_rdma_ops = { 79 .xpo_create = svc_rdma_create, 80 .xpo_recvfrom = svc_rdma_recvfrom, 81 .xpo_sendto = svc_rdma_sendto, 82 .xpo_result_payload = svc_rdma_result_payload, 83 .xpo_release_ctxt = svc_rdma_release_ctxt, 84 .xpo_detach = svc_rdma_detach, 85 .xpo_free = svc_rdma_free, 86 .xpo_has_wspace = svc_rdma_has_wspace, 87 .xpo_accept = svc_rdma_accept, 88 .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt, 89}; 90 91struct svc_xprt_class svc_rdma_class = { 92 .xcl_name = "rdma", 93 .xcl_owner = THIS_MODULE, 94 .xcl_ops = &svc_rdma_ops, 95 .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, 96 .xcl_ident = XPRT_TRANSPORT_RDMA, 97}; 98 99/* QP event handler */ 100static void qp_event_handler(struct ib_event *event, void *context) 101{ 102 struct svc_xprt *xprt = context; 103 104 trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); 105 switch (event->event) { 106 /* These are considered benign events */ 107 case IB_EVENT_PATH_MIG: 108 case IB_EVENT_COMM_EST: 109 case IB_EVENT_SQ_DRAINED: 110 case IB_EVENT_QP_LAST_WQE_REACHED: 111 break; 112 113 /* These are considered fatal events */ 114 case IB_EVENT_PATH_MIG_ERR: 115 case IB_EVENT_QP_FATAL: 116 case IB_EVENT_QP_REQ_ERR: 117 case IB_EVENT_QP_ACCESS_ERR: 118 case IB_EVENT_DEVICE_FATAL: 119 default: 120 svc_xprt_deferred_close(xprt); 121 break; 122 } 123} 124 125static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 126 struct net *net, int node) 127{ 128 static struct lock_class_key svcrdma_rwctx_lock; 129 static struct lock_class_key svcrdma_sctx_lock; 130 static struct lock_class_key svcrdma_dto_lock; 131 struct svcxprt_rdma *cma_xprt; 132 133 cma_xprt = kzalloc_node(sizeof(*cma_xprt), GFP_KERNEL, node); 134 if (!cma_xprt) 135 return NULL; 136 137 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); 138 INIT_LIST_HEAD(&cma_xprt->sc_accept_q); 139 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); 140 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); 141 init_llist_head(&cma_xprt->sc_send_ctxts); 142 init_llist_head(&cma_xprt->sc_recv_ctxts); 143 init_llist_head(&cma_xprt->sc_rw_ctxts); 144 init_waitqueue_head(&cma_xprt->sc_send_wait); 145 146 spin_lock_init(&cma_xprt->sc_lock); 147 spin_lock_init(&cma_xprt->sc_rq_dto_lock); 148 lockdep_set_class(&cma_xprt->sc_rq_dto_lock, &svcrdma_dto_lock); 149 spin_lock_init(&cma_xprt->sc_send_lock); 150 lockdep_set_class(&cma_xprt->sc_send_lock, &svcrdma_sctx_lock); 151 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); 152 lockdep_set_class(&cma_xprt->sc_rw_ctxt_lock, &svcrdma_rwctx_lock); 153 154 /* 155 * Note that this implies that the underlying transport support 156 * has some form of congestion control (see RFC 7530 section 3.1 157 * paragraph 2). For now, we assume that all supported RDMA 158 * transports are suitable here. 159 */ 160 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); 161 162 return cma_xprt; 163} 164 165static void 166svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, 167 struct rdma_conn_param *param) 168{ 169 const struct rpcrdma_connect_private *pmsg = param->private_data; 170 171 if (pmsg && 172 pmsg->cp_magic == rpcrdma_cmp_magic && 173 pmsg->cp_version == RPCRDMA_CMP_VERSION) { 174 newxprt->sc_snd_w_inv = pmsg->cp_flags & 175 RPCRDMA_CMP_F_SND_W_INV_OK; 176 177 dprintk("svcrdma: client send_size %u, recv_size %u " 178 "remote inv %ssupported\n", 179 rpcrdma_decode_buffer_size(pmsg->cp_send_size), 180 rpcrdma_decode_buffer_size(pmsg->cp_recv_size), 181 newxprt->sc_snd_w_inv ? "" : "un"); 182 } 183} 184 185/* 186 * This function handles the CONNECT_REQUEST event on a listening 187 * endpoint. It is passed the cma_id for the _new_ connection. The context in 188 * this cma_id is inherited from the listening cma_id and is the svc_xprt 189 * structure for the listening endpoint. 190 * 191 * This function creates a new xprt for the new connection and enqueues it on 192 * the accept queue for the listent xprt. When the listen thread is kicked, it 193 * will call the recvfrom method on the listen xprt which will accept the new 194 * connection. 195 */ 196static void handle_connect_req(struct rdma_cm_id *new_cma_id, 197 struct rdma_conn_param *param) 198{ 199 struct svcxprt_rdma *listen_xprt = new_cma_id->context; 200 struct svcxprt_rdma *newxprt; 201 struct sockaddr *sa; 202 203 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 204 listen_xprt->sc_xprt.xpt_net, 205 ibdev_to_node(new_cma_id->device)); 206 if (!newxprt) 207 return; 208 newxprt->sc_cm_id = new_cma_id; 209 new_cma_id->context = newxprt; 210 svc_rdma_parse_connect_private(newxprt, param); 211 212 /* Save client advertised inbound read limit for use later in accept. */ 213 newxprt->sc_ord = param->initiator_depth; 214 215 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 216 newxprt->sc_xprt.xpt_remotelen = svc_addr_len(sa); 217 memcpy(&newxprt->sc_xprt.xpt_remote, sa, 218 newxprt->sc_xprt.xpt_remotelen); 219 snprintf(newxprt->sc_xprt.xpt_remotebuf, 220 sizeof(newxprt->sc_xprt.xpt_remotebuf) - 1, "%pISc", sa); 221 222 /* The remote port is arbitrary and not under the control of the 223 * client ULP. Set it to a fixed value so that the DRC continues 224 * to be effective after a reconnect. 225 */ 226 rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0); 227 228 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 229 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 230 231 /* 232 * Enqueue the new transport on the accept queue of the listening 233 * transport 234 */ 235 spin_lock(&listen_xprt->sc_lock); 236 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); 237 spin_unlock(&listen_xprt->sc_lock); 238 239 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); 240 svc_xprt_enqueue(&listen_xprt->sc_xprt); 241} 242 243/** 244 * svc_rdma_listen_handler - Handle CM events generated on a listening endpoint 245 * @cma_id: the server's listener rdma_cm_id 246 * @event: details of the event 247 * 248 * Return values: 249 * %0: Do not destroy @cma_id 250 * %1: Destroy @cma_id (never returned here) 251 * 252 * NB: There is never a DEVICE_REMOVAL event for INADDR_ANY listeners. 253 */ 254static int svc_rdma_listen_handler(struct rdma_cm_id *cma_id, 255 struct rdma_cm_event *event) 256{ 257 switch (event->event) { 258 case RDMA_CM_EVENT_CONNECT_REQUEST: 259 handle_connect_req(cma_id, &event->param.conn); 260 break; 261 default: 262 break; 263 } 264 return 0; 265} 266 267/** 268 * svc_rdma_cma_handler - Handle CM events on client connections 269 * @cma_id: the server's listener rdma_cm_id 270 * @event: details of the event 271 * 272 * Return values: 273 * %0: Do not destroy @cma_id 274 * %1: Destroy @cma_id (never returned here) 275 */ 276static int svc_rdma_cma_handler(struct rdma_cm_id *cma_id, 277 struct rdma_cm_event *event) 278{ 279 struct svcxprt_rdma *rdma = cma_id->context; 280 struct svc_xprt *xprt = &rdma->sc_xprt; 281 282 switch (event->event) { 283 case RDMA_CM_EVENT_ESTABLISHED: 284 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); 285 286 /* Handle any requests that were received while 287 * CONN_PENDING was set. */ 288 svc_xprt_enqueue(xprt); 289 break; 290 case RDMA_CM_EVENT_DISCONNECTED: 291 case RDMA_CM_EVENT_DEVICE_REMOVAL: 292 svc_xprt_deferred_close(xprt); 293 break; 294 default: 295 break; 296 } 297 return 0; 298} 299 300/* 301 * Create a listening RDMA service endpoint. 302 */ 303static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 304 struct net *net, 305 struct sockaddr *sa, int salen, 306 int flags) 307{ 308 struct rdma_cm_id *listen_id; 309 struct svcxprt_rdma *cma_xprt; 310 int ret; 311 312 if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) 313 return ERR_PTR(-EAFNOSUPPORT); 314 cma_xprt = svc_rdma_create_xprt(serv, net, NUMA_NO_NODE); 315 if (!cma_xprt) 316 return ERR_PTR(-ENOMEM); 317 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); 318 strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); 319 320 listen_id = rdma_create_id(net, svc_rdma_listen_handler, cma_xprt, 321 RDMA_PS_TCP, IB_QPT_RC); 322 if (IS_ERR(listen_id)) { 323 ret = PTR_ERR(listen_id); 324 goto err0; 325 } 326 327 /* Allow both IPv4 and IPv6 sockets to bind a single port 328 * at the same time. 329 */ 330#if IS_ENABLED(CONFIG_IPV6) 331 ret = rdma_set_afonly(listen_id, 1); 332 if (ret) 333 goto err1; 334#endif 335 ret = rdma_bind_addr(listen_id, sa); 336 if (ret) 337 goto err1; 338 cma_xprt->sc_cm_id = listen_id; 339 340 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); 341 if (ret) 342 goto err1; 343 344 /* 345 * We need to use the address from the cm_id in case the 346 * caller specified 0 for the port number. 347 */ 348 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; 349 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); 350 351 return &cma_xprt->sc_xprt; 352 353 err1: 354 rdma_destroy_id(listen_id); 355 err0: 356 kfree(cma_xprt); 357 return ERR_PTR(ret); 358} 359 360/* 361 * This is the xpo_recvfrom function for listening endpoints. Its 362 * purpose is to accept incoming connections. The CMA callback handler 363 * has already created a new transport and attached it to the new CMA 364 * ID. 365 * 366 * There is a queue of pending connections hung on the listening 367 * transport. This queue contains the new svc_xprt structure. This 368 * function takes svc_xprt structures off the accept_q and completes 369 * the connection. 370 */ 371static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) 372{ 373 struct svcxprt_rdma *listen_rdma; 374 struct svcxprt_rdma *newxprt = NULL; 375 struct rdma_conn_param conn_param; 376 struct rpcrdma_connect_private pmsg; 377 struct ib_qp_init_attr qp_attr; 378 unsigned int ctxts, rq_depth; 379 struct ib_device *dev; 380 int ret = 0; 381 RPC_IFDEBUG(struct sockaddr *sap); 382 383 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); 384 clear_bit(XPT_CONN, &xprt->xpt_flags); 385 /* Get the next entry off the accept list */ 386 spin_lock(&listen_rdma->sc_lock); 387 if (!list_empty(&listen_rdma->sc_accept_q)) { 388 newxprt = list_entry(listen_rdma->sc_accept_q.next, 389 struct svcxprt_rdma, sc_accept_q); 390 list_del_init(&newxprt->sc_accept_q); 391 } 392 if (!list_empty(&listen_rdma->sc_accept_q)) 393 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); 394 spin_unlock(&listen_rdma->sc_lock); 395 if (!newxprt) 396 return NULL; 397 398 dev = newxprt->sc_cm_id->device; 399 newxprt->sc_port_num = newxprt->sc_cm_id->port_num; 400 401 newxprt->sc_max_req_size = svcrdma_max_req_size; 402 newxprt->sc_max_requests = svcrdma_max_requests; 403 newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; 404 newxprt->sc_recv_batch = RPCRDMA_MAX_RECV_BATCH; 405 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); 406 407 /* Qualify the transport's resource defaults with the 408 * capabilities of this particular device. 409 */ 410 411 /* Transport header, head iovec, tail iovec */ 412 newxprt->sc_max_send_sges = 3; 413 /* Add one SGE per page list entry */ 414 newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1; 415 if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) 416 newxprt->sc_max_send_sges = dev->attrs.max_send_sge; 417 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests + 418 newxprt->sc_recv_batch + 1 /* drain */; 419 if (rq_depth > dev->attrs.max_qp_wr) { 420 rq_depth = dev->attrs.max_qp_wr; 421 newxprt->sc_recv_batch = 1; 422 newxprt->sc_max_requests = rq_depth - 2; 423 newxprt->sc_max_bc_requests = 2; 424 } 425 426 /* Arbitrarily estimate the number of rw_ctxs needed for 427 * this transport. This is enough rw_ctxs to make forward 428 * progress even if the client is using one rkey per page 429 * in each Read chunk. 430 */ 431 ctxts = 3 * RPCSVC_MAXPAGES; 432 newxprt->sc_sq_depth = rq_depth + ctxts; 433 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) 434 newxprt->sc_sq_depth = dev->attrs.max_qp_wr; 435 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); 436 437 newxprt->sc_pd = ib_alloc_pd(dev, 0); 438 if (IS_ERR(newxprt->sc_pd)) { 439 trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd)); 440 goto errout; 441 } 442 newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth, 443 IB_POLL_WORKQUEUE); 444 if (IS_ERR(newxprt->sc_sq_cq)) 445 goto errout; 446 newxprt->sc_rq_cq = 447 ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE); 448 if (IS_ERR(newxprt->sc_rq_cq)) 449 goto errout; 450 451 memset(&qp_attr, 0, sizeof qp_attr); 452 qp_attr.event_handler = qp_event_handler; 453 qp_attr.qp_context = &newxprt->sc_xprt; 454 qp_attr.port_num = newxprt->sc_port_num; 455 qp_attr.cap.max_rdma_ctxs = ctxts; 456 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; 457 qp_attr.cap.max_recv_wr = rq_depth; 458 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; 459 qp_attr.cap.max_recv_sge = 1; 460 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 461 qp_attr.qp_type = IB_QPT_RC; 462 qp_attr.send_cq = newxprt->sc_sq_cq; 463 qp_attr.recv_cq = newxprt->sc_rq_cq; 464 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", 465 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); 466 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", 467 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); 468 dprintk(" send CQ depth = %u, recv CQ depth = %u\n", 469 newxprt->sc_sq_depth, rq_depth); 470 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); 471 if (ret) { 472 trace_svcrdma_qp_err(newxprt, ret); 473 goto errout; 474 } 475 newxprt->sc_max_send_sges = qp_attr.cap.max_send_sge; 476 newxprt->sc_qp = newxprt->sc_cm_id->qp; 477 478 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) 479 newxprt->sc_snd_w_inv = false; 480 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) && 481 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) { 482 trace_svcrdma_fabric_err(newxprt, -EINVAL); 483 goto errout; 484 } 485 486 if (!svc_rdma_post_recvs(newxprt)) 487 goto errout; 488 489 /* Construct RDMA-CM private message */ 490 pmsg.cp_magic = rpcrdma_cmp_magic; 491 pmsg.cp_version = RPCRDMA_CMP_VERSION; 492 pmsg.cp_flags = 0; 493 pmsg.cp_send_size = pmsg.cp_recv_size = 494 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); 495 496 /* Accept Connection */ 497 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); 498 memset(&conn_param, 0, sizeof conn_param); 499 conn_param.responder_resources = 0; 500 conn_param.initiator_depth = min_t(int, newxprt->sc_ord, 501 dev->attrs.max_qp_init_rd_atom); 502 if (!conn_param.initiator_depth) { 503 ret = -EINVAL; 504 trace_svcrdma_initdepth_err(newxprt, ret); 505 goto errout; 506 } 507 conn_param.private_data = &pmsg; 508 conn_param.private_data_len = sizeof(pmsg); 509 rdma_lock_handler(newxprt->sc_cm_id); 510 newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler; 511 ret = rdma_accept(newxprt->sc_cm_id, &conn_param); 512 rdma_unlock_handler(newxprt->sc_cm_id); 513 if (ret) { 514 trace_svcrdma_accept_err(newxprt, ret); 515 goto errout; 516 } 517 518#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 519 dprintk("svcrdma: new connection accepted on device %s:\n", dev->name); 520 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 521 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); 522 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 523 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); 524 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); 525 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); 526 dprintk(" rdma_rw_ctxs : %d\n", ctxts); 527 dprintk(" max_requests : %d\n", newxprt->sc_max_requests); 528 dprintk(" ord : %d\n", conn_param.initiator_depth); 529#endif 530 531 return &newxprt->sc_xprt; 532 533 errout: 534 /* Take a reference in case the DTO handler runs */ 535 svc_xprt_get(&newxprt->sc_xprt); 536 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) 537 ib_destroy_qp(newxprt->sc_qp); 538 rdma_destroy_id(newxprt->sc_cm_id); 539 /* This call to put will destroy the transport */ 540 svc_xprt_put(&newxprt->sc_xprt); 541 return NULL; 542} 543 544static void svc_rdma_detach(struct svc_xprt *xprt) 545{ 546 struct svcxprt_rdma *rdma = 547 container_of(xprt, struct svcxprt_rdma, sc_xprt); 548 549 rdma_disconnect(rdma->sc_cm_id); 550} 551 552static void __svc_rdma_free(struct work_struct *work) 553{ 554 struct svcxprt_rdma *rdma = 555 container_of(work, struct svcxprt_rdma, sc_work); 556 557 /* This blocks until the Completion Queues are empty */ 558 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 559 ib_drain_qp(rdma->sc_qp); 560 flush_workqueue(svcrdma_wq); 561 562 svc_rdma_flush_recv_queues(rdma); 563 564 svc_rdma_destroy_rw_ctxts(rdma); 565 svc_rdma_send_ctxts_destroy(rdma); 566 svc_rdma_recv_ctxts_destroy(rdma); 567 568 /* Destroy the QP if present (not a listener) */ 569 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 570 ib_destroy_qp(rdma->sc_qp); 571 572 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) 573 ib_free_cq(rdma->sc_sq_cq); 574 575 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) 576 ib_free_cq(rdma->sc_rq_cq); 577 578 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) 579 ib_dealloc_pd(rdma->sc_pd); 580 581 /* Destroy the CM ID */ 582 rdma_destroy_id(rdma->sc_cm_id); 583 584 kfree(rdma); 585} 586 587static void svc_rdma_free(struct svc_xprt *xprt) 588{ 589 struct svcxprt_rdma *rdma = 590 container_of(xprt, struct svcxprt_rdma, sc_xprt); 591 592 INIT_WORK(&rdma->sc_work, __svc_rdma_free); 593 schedule_work(&rdma->sc_work); 594} 595 596static int svc_rdma_has_wspace(struct svc_xprt *xprt) 597{ 598 struct svcxprt_rdma *rdma = 599 container_of(xprt, struct svcxprt_rdma, sc_xprt); 600 601 /* 602 * If there are already waiters on the SQ, 603 * return false. 604 */ 605 if (waitqueue_active(&rdma->sc_send_wait)) 606 return 0; 607 608 /* Otherwise return true. */ 609 return 1; 610} 611 612static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) 613{ 614} 615