1/* 2 * Copyright (c) 2006 Oracle. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33#include <linux/kernel.h> 34#include <linux/in.h> 35#include <linux/slab.h> 36#include <linux/vmalloc.h> 37#include <linux/ratelimit.h> 38 39#include "rds.h" 40#include "ib.h" 41 42static char *rds_ib_event_type_strings[] = { 43#define RDS_IB_EVENT_STRING(foo) \ 44 [IB_EVENT_##foo] = __stringify(IB_EVENT_##foo) 45 RDS_IB_EVENT_STRING(CQ_ERR), 46 RDS_IB_EVENT_STRING(QP_FATAL), 47 RDS_IB_EVENT_STRING(QP_REQ_ERR), 48 RDS_IB_EVENT_STRING(QP_ACCESS_ERR), 49 RDS_IB_EVENT_STRING(COMM_EST), 50 RDS_IB_EVENT_STRING(SQ_DRAINED), 51 RDS_IB_EVENT_STRING(PATH_MIG), 52 RDS_IB_EVENT_STRING(PATH_MIG_ERR), 53 RDS_IB_EVENT_STRING(DEVICE_FATAL), 54 RDS_IB_EVENT_STRING(PORT_ACTIVE), 55 RDS_IB_EVENT_STRING(PORT_ERR), 56 RDS_IB_EVENT_STRING(LID_CHANGE), 57 RDS_IB_EVENT_STRING(PKEY_CHANGE), 58 RDS_IB_EVENT_STRING(SM_CHANGE), 59 RDS_IB_EVENT_STRING(SRQ_ERR), 60 RDS_IB_EVENT_STRING(SRQ_LIMIT_REACHED), 61 RDS_IB_EVENT_STRING(QP_LAST_WQE_REACHED), 62 RDS_IB_EVENT_STRING(CLIENT_REREGISTER), 63#undef RDS_IB_EVENT_STRING 64}; 65 66static char *rds_ib_event_str(enum ib_event_type type) 67{ 68 return rds_str_array(rds_ib_event_type_strings, 69 ARRAY_SIZE(rds_ib_event_type_strings), type); 70}; 71 72/* 73 * Set the selected protocol version 74 */ 75static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version) 76{ 77 conn->c_version = version; 78} 79 80/* 81 * Set up flow control 82 */ 83static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits) 84{ 85 struct rds_ib_connection *ic = conn->c_transport_data; 86 87 if (rds_ib_sysctl_flow_control && credits != 0) { 88 /* We're doing flow control */ 89 ic->i_flowctl = 1; 90 rds_ib_send_add_credits(conn, credits); 91 } else { 92 ic->i_flowctl = 0; 93 } 94} 95 96/* 97 * Tune RNR behavior. Without flow control, we use a rather 98 * low timeout, but not the absolute minimum - this should 99 * be tunable. 100 * 101 * We already set the RNR retry count to 7 (which is the 102 * smallest infinite number :-) above. 103 * If flow control is off, we want to change this back to 0 104 * so that we learn quickly when our credit accounting is 105 * buggy. 106 * 107 * Caller passes in a qp_attr pointer - don't waste stack spacv 108 * by allocation this twice. 109 */ 110static void 111rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr) 112{ 113 int ret; 114 115 attr->min_rnr_timer = IB_RNR_TIMER_000_32; 116 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER); 117 if (ret) 118 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret); 119} 120 121/* 122 * Connection established. 123 * We get here for both outgoing and incoming connection. 124 */ 125void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) 126{ 127 const struct rds_ib_connect_private *dp = NULL; 128 struct rds_ib_connection *ic = conn->c_transport_data; 129 struct ib_qp_attr qp_attr; 130 int err; 131 132 if (event->param.conn.private_data_len >= sizeof(*dp)) { 133 dp = event->param.conn.private_data; 134 135 /* make sure it isn't empty data */ 136 if (dp->dp_protocol_major) { 137 rds_ib_set_protocol(conn, 138 RDS_PROTOCOL(dp->dp_protocol_major, 139 dp->dp_protocol_minor)); 140 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); 141 } 142 } 143 144 if (conn->c_version < RDS_PROTOCOL(3,1)) { 145 printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed," 146 " no longer supported\n", 147 &conn->c_faddr, 148 RDS_PROTOCOL_MAJOR(conn->c_version), 149 RDS_PROTOCOL_MINOR(conn->c_version)); 150 rds_conn_destroy(conn); 151 return; 152 } else { 153 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", 154 &conn->c_faddr, 155 RDS_PROTOCOL_MAJOR(conn->c_version), 156 RDS_PROTOCOL_MINOR(conn->c_version), 157 ic->i_flowctl ? ", flow control" : ""); 158 } 159 160 /* 161 * Init rings and fill recv. this needs to wait until protocol negotiation 162 * is complete, since ring layout is different from 3.0 to 3.1. 163 */ 164 rds_ib_send_init_ring(ic); 165 rds_ib_recv_init_ring(ic); 166 /* Post receive buffers - as a side effect, this will update 167 * the posted credit count. */ 168 rds_ib_recv_refill(conn, 1); 169 170 /* Tune RNR behavior */ 171 rds_ib_tune_rnr(ic, &qp_attr); 172 173 qp_attr.qp_state = IB_QPS_RTS; 174 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); 175 if (err) 176 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err); 177 178 /* update ib_device with this local ipaddr */ 179 err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr); 180 if (err) 181 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", 182 err); 183 184 /* If the peer gave us the last packet it saw, process this as if 185 * we had received a regular ACK. */ 186 if (dp) { 187 /* dp structure start is not guaranteed to be 8 bytes aligned. 188 * Since dp_ack_seq is 64-bit extended load operations can be 189 * used so go through get_unaligned to avoid unaligned errors. 190 */ 191 __be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq); 192 193 if (dp_ack_seq) 194 rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq), 195 NULL); 196 } 197 198 rds_connect_complete(conn); 199} 200 201static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, 202 struct rdma_conn_param *conn_param, 203 struct rds_ib_connect_private *dp, 204 u32 protocol_version, 205 u32 max_responder_resources, 206 u32 max_initiator_depth) 207{ 208 struct rds_ib_connection *ic = conn->c_transport_data; 209 struct rds_ib_device *rds_ibdev = ic->rds_ibdev; 210 211 memset(conn_param, 0, sizeof(struct rdma_conn_param)); 212 213 conn_param->responder_resources = 214 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources); 215 conn_param->initiator_depth = 216 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth); 217 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7); 218 conn_param->rnr_retry_count = 7; 219 220 if (dp) { 221 memset(dp, 0, sizeof(*dp)); 222 dp->dp_saddr = conn->c_laddr; 223 dp->dp_daddr = conn->c_faddr; 224 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); 225 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); 226 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); 227 dp->dp_ack_seq = rds_ib_piggyb_ack(ic); 228 229 /* Advertise flow control */ 230 if (ic->i_flowctl) { 231 unsigned int credits; 232 233 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); 234 dp->dp_credit = cpu_to_be32(credits); 235 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); 236 } 237 238 conn_param->private_data = dp; 239 conn_param->private_data_len = sizeof(*dp); 240 } 241} 242 243static void rds_ib_cq_event_handler(struct ib_event *event, void *data) 244{ 245 rdsdebug("event %u (%s) data %p\n", 246 event->event, rds_ib_event_str(event->event), data); 247} 248 249static void rds_ib_qp_event_handler(struct ib_event *event, void *data) 250{ 251 struct rds_connection *conn = data; 252 struct rds_ib_connection *ic = conn->c_transport_data; 253 254 rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event, 255 rds_ib_event_str(event->event)); 256 257 switch (event->event) { 258 case IB_EVENT_COMM_EST: 259 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); 260 break; 261 default: 262 rdsdebug("Fatal QP Event %u (%s) " 263 "- connection %pI4->%pI4, reconnecting\n", 264 event->event, rds_ib_event_str(event->event), 265 &conn->c_laddr, &conn->c_faddr); 266 rds_conn_drop(conn); 267 break; 268 } 269} 270 271/* 272 * This needs to be very careful to not leave IS_ERR pointers around for 273 * cleanup to trip over. 274 */ 275static int rds_ib_setup_qp(struct rds_connection *conn) 276{ 277 struct rds_ib_connection *ic = conn->c_transport_data; 278 struct ib_device *dev = ic->i_cm_id->device; 279 struct ib_qp_init_attr attr; 280 struct rds_ib_device *rds_ibdev; 281 int ret; 282 283 /* 284 * It's normal to see a null device if an incoming connection races 285 * with device removal, so we don't print a warning. 286 */ 287 rds_ibdev = rds_ib_get_client_data(dev); 288 if (!rds_ibdev) 289 return -EOPNOTSUPP; 290 291 /* add the conn now so that connection establishment has the dev */ 292 rds_ib_add_conn(rds_ibdev, conn); 293 294 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) 295 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); 296 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) 297 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); 298 299 /* Protection domain and memory range */ 300 ic->i_pd = rds_ibdev->pd; 301 ic->i_mr = rds_ibdev->mr; 302 303 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler, 304 rds_ib_cq_event_handler, conn, 305 ic->i_send_ring.w_nr + 1, 0); 306 if (IS_ERR(ic->i_send_cq)) { 307 ret = PTR_ERR(ic->i_send_cq); 308 ic->i_send_cq = NULL; 309 rdsdebug("ib_create_cq send failed: %d\n", ret); 310 goto out; 311 } 312 313 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler, 314 rds_ib_cq_event_handler, conn, 315 ic->i_recv_ring.w_nr, 0); 316 if (IS_ERR(ic->i_recv_cq)) { 317 ret = PTR_ERR(ic->i_recv_cq); 318 ic->i_recv_cq = NULL; 319 rdsdebug("ib_create_cq recv failed: %d\n", ret); 320 goto out; 321 } 322 323 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); 324 if (ret) { 325 rdsdebug("ib_req_notify_cq send failed: %d\n", ret); 326 goto out; 327 } 328 329 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); 330 if (ret) { 331 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); 332 goto out; 333 } 334 335 /* XXX negotiate max send/recv with remote? */ 336 memset(&attr, 0, sizeof(attr)); 337 attr.event_handler = rds_ib_qp_event_handler; 338 attr.qp_context = conn; 339 /* + 1 to allow for the single ack message */ 340 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1; 341 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1; 342 attr.cap.max_send_sge = rds_ibdev->max_sge; 343 attr.cap.max_recv_sge = RDS_IB_RECV_SGE; 344 attr.sq_sig_type = IB_SIGNAL_REQ_WR; 345 attr.qp_type = IB_QPT_RC; 346 attr.send_cq = ic->i_send_cq; 347 attr.recv_cq = ic->i_recv_cq; 348 349 /* 350 * XXX this can fail if max_*_wr is too large? Are we supposed 351 * to back off until we get a value that the hardware can support? 352 */ 353 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); 354 if (ret) { 355 rdsdebug("rdma_create_qp failed: %d\n", ret); 356 goto out; 357 } 358 359 ic->i_send_hdrs = ib_dma_alloc_coherent(dev, 360 ic->i_send_ring.w_nr * 361 sizeof(struct rds_header), 362 &ic->i_send_hdrs_dma, GFP_KERNEL); 363 if (!ic->i_send_hdrs) { 364 ret = -ENOMEM; 365 rdsdebug("ib_dma_alloc_coherent send failed\n"); 366 goto out; 367 } 368 369 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, 370 ic->i_recv_ring.w_nr * 371 sizeof(struct rds_header), 372 &ic->i_recv_hdrs_dma, GFP_KERNEL); 373 if (!ic->i_recv_hdrs) { 374 ret = -ENOMEM; 375 rdsdebug("ib_dma_alloc_coherent recv failed\n"); 376 goto out; 377 } 378 379 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), 380 &ic->i_ack_dma, GFP_KERNEL); 381 if (!ic->i_ack) { 382 ret = -ENOMEM; 383 rdsdebug("ib_dma_alloc_coherent ack failed\n"); 384 goto out; 385 } 386 387 ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work), 388 ibdev_to_node(dev)); 389 if (!ic->i_sends) { 390 ret = -ENOMEM; 391 rdsdebug("send allocation failed\n"); 392 goto out; 393 } 394 395 ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work), 396 ibdev_to_node(dev)); 397 if (!ic->i_recvs) { 398 ret = -ENOMEM; 399 rdsdebug("recv allocation failed\n"); 400 goto out; 401 } 402 403 rds_ib_recv_init_ack(ic); 404 405 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr, 406 ic->i_send_cq, ic->i_recv_cq); 407 408out: 409 rds_ib_dev_put(rds_ibdev); 410 return ret; 411} 412 413static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event) 414{ 415 const struct rds_ib_connect_private *dp = event->param.conn.private_data; 416 u16 common; 417 u32 version = 0; 418 419 /* 420 * rdma_cm private data is odd - when there is any private data in the 421 * request, we will be given a pretty large buffer without telling us the 422 * original size. The only way to tell the difference is by looking at 423 * the contents, which are initialized to zero. 424 * If the protocol version fields aren't set, this is a connection attempt 425 * from an older version. This could could be 3.0 or 2.0 - we can't tell. 426 * We really should have changed this for OFED 1.3 :-( 427 */ 428 429 /* Be paranoid. RDS always has privdata */ 430 if (!event->param.conn.private_data_len) { 431 printk(KERN_NOTICE "RDS incoming connection has no private data, " 432 "rejecting\n"); 433 return 0; 434 } 435 436 /* Even if len is crap *now* I still want to check it. -ASG */ 437 if (event->param.conn.private_data_len < sizeof (*dp) || 438 dp->dp_protocol_major == 0) 439 return RDS_PROTOCOL_3_0; 440 441 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS; 442 if (dp->dp_protocol_major == 3 && common) { 443 version = RDS_PROTOCOL_3_0; 444 while ((common >>= 1) != 0) 445 version++; 446 } else 447 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n", 448 &dp->dp_saddr, 449 dp->dp_protocol_major, 450 dp->dp_protocol_minor); 451 return version; 452} 453 454int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 455 struct rdma_cm_event *event) 456{ 457 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id; 458 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id; 459 const struct rds_ib_connect_private *dp = event->param.conn.private_data; 460 struct rds_ib_connect_private dp_rep; 461 struct rds_connection *conn = NULL; 462 struct rds_ib_connection *ic = NULL; 463 struct rdma_conn_param conn_param; 464 u32 version; 465 int err = 1, destroy = 1; 466 467 /* Check whether the remote protocol version matches ours. */ 468 version = rds_ib_protocol_compatible(event); 469 if (!version) 470 goto out; 471 472 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid " 473 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr, 474 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version), 475 (unsigned long long)be64_to_cpu(lguid), 476 (unsigned long long)be64_to_cpu(fguid)); 477 478 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport, 479 GFP_KERNEL); 480 if (IS_ERR(conn)) { 481 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); 482 conn = NULL; 483 goto out; 484 } 485 486 /* 487 * The connection request may occur while the 488 * previous connection exist, e.g. in case of failover. 489 * But as connections may be initiated simultaneously 490 * by both hosts, we have a random backoff mechanism - 491 * see the comment above rds_queue_reconnect() 492 */ 493 mutex_lock(&conn->c_cm_lock); 494 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { 495 if (rds_conn_state(conn) == RDS_CONN_UP) { 496 rdsdebug("incoming connect while connecting\n"); 497 rds_conn_drop(conn); 498 rds_ib_stats_inc(s_ib_listen_closed_stale); 499 } else 500 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { 501 /* Wait and see - our connect may still be succeeding */ 502 rds_ib_stats_inc(s_ib_connect_raced); 503 } 504 goto out; 505 } 506 507 ic = conn->c_transport_data; 508 509 rds_ib_set_protocol(conn, version); 510 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); 511 512 /* If the peer gave us the last packet it saw, process this as if 513 * we had received a regular ACK. */ 514 if (dp->dp_ack_seq) 515 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); 516 517 BUG_ON(cm_id->context); 518 BUG_ON(ic->i_cm_id); 519 520 ic->i_cm_id = cm_id; 521 cm_id->context = conn; 522 523 /* We got halfway through setting up the ib_connection, if we 524 * fail now, we have to take the long route out of this mess. */ 525 destroy = 0; 526 527 err = rds_ib_setup_qp(conn); 528 if (err) { 529 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err); 530 goto out; 531 } 532 533 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version, 534 event->param.conn.responder_resources, 535 event->param.conn.initiator_depth); 536 537 /* rdma_accept() calls rdma_reject() internally if it fails */ 538 err = rdma_accept(cm_id, &conn_param); 539 if (err) 540 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err); 541 542out: 543 if (conn) 544 mutex_unlock(&conn->c_cm_lock); 545 if (err) 546 rdma_reject(cm_id, NULL, 0); 547 return destroy; 548} 549 550 551int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id) 552{ 553 struct rds_connection *conn = cm_id->context; 554 struct rds_ib_connection *ic = conn->c_transport_data; 555 struct rdma_conn_param conn_param; 556 struct rds_ib_connect_private dp; 557 int ret; 558 559 /* If the peer doesn't do protocol negotiation, we must 560 * default to RDSv3.0 */ 561 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0); 562 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */ 563 564 ret = rds_ib_setup_qp(conn); 565 if (ret) { 566 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret); 567 goto out; 568 } 569 570 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION, 571 UINT_MAX, UINT_MAX); 572 ret = rdma_connect(cm_id, &conn_param); 573 if (ret) 574 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); 575 576out: 577 /* Beware - returning non-zero tells the rdma_cm to destroy 578 * the cm_id. We should certainly not do it as long as we still 579 * "own" the cm_id. */ 580 if (ret) { 581 if (ic->i_cm_id == cm_id) 582 ret = 0; 583 } 584 return ret; 585} 586 587int rds_ib_conn_connect(struct rds_connection *conn) 588{ 589 struct rds_ib_connection *ic = conn->c_transport_data; 590 struct sockaddr_in src, dest; 591 int ret; 592 593 /* XXX I wonder what affect the port space has */ 594 /* delegate cm event handler to rdma_transport */ 595 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn, 596 RDMA_PS_TCP, IB_QPT_RC); 597 if (IS_ERR(ic->i_cm_id)) { 598 ret = PTR_ERR(ic->i_cm_id); 599 ic->i_cm_id = NULL; 600 rdsdebug("rdma_create_id() failed: %d\n", ret); 601 goto out; 602 } 603 604 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); 605 606 src.sin_family = AF_INET; 607 src.sin_addr.s_addr = (__force u32)conn->c_laddr; 608 src.sin_port = (__force u16)htons(0); 609 610 dest.sin_family = AF_INET; 611 dest.sin_addr.s_addr = (__force u32)conn->c_faddr; 612 dest.sin_port = (__force u16)htons(RDS_PORT); 613 614 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, 615 (struct sockaddr *)&dest, 616 RDS_RDMA_RESOLVE_TIMEOUT_MS); 617 if (ret) { 618 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, 619 ret); 620 rdma_destroy_id(ic->i_cm_id); 621 ic->i_cm_id = NULL; 622 } 623 624out: 625 return ret; 626} 627 628/* 629 * This is so careful about only cleaning up resources that were built up 630 * so that it can be called at any point during startup. In fact it 631 * can be called multiple times for a given connection. 632 */ 633void rds_ib_conn_shutdown(struct rds_connection *conn) 634{ 635 struct rds_ib_connection *ic = conn->c_transport_data; 636 int err = 0; 637 638 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, 639 ic->i_pd, ic->i_send_cq, ic->i_recv_cq, 640 ic->i_cm_id ? ic->i_cm_id->qp : NULL); 641 642 if (ic->i_cm_id) { 643 struct ib_device *dev = ic->i_cm_id->device; 644 645 rdsdebug("disconnecting cm %p\n", ic->i_cm_id); 646 err = rdma_disconnect(ic->i_cm_id); 647 if (err) { 648 /* Actually this may happen quite frequently, when 649 * an outgoing connect raced with an incoming connect. 650 */ 651 rdsdebug("failed to disconnect, cm: %p err %d\n", 652 ic->i_cm_id, err); 653 } 654 655 /* 656 * We want to wait for tx and rx completion to finish 657 * before we tear down the connection, but we have to be 658 * careful not to get stuck waiting on a send ring that 659 * only has unsignaled sends in it. We've shutdown new 660 * sends before getting here so by waiting for signaled 661 * sends to complete we're ensured that there will be no 662 * more tx processing. 663 */ 664 wait_event(rds_ib_ring_empty_wait, 665 rds_ib_ring_empty(&ic->i_recv_ring) && 666 (atomic_read(&ic->i_signaled_sends) == 0)); 667 tasklet_kill(&ic->i_recv_tasklet); 668 669 if (ic->i_send_hdrs) 670 ib_dma_free_coherent(dev, 671 ic->i_send_ring.w_nr * 672 sizeof(struct rds_header), 673 ic->i_send_hdrs, 674 ic->i_send_hdrs_dma); 675 676 if (ic->i_recv_hdrs) 677 ib_dma_free_coherent(dev, 678 ic->i_recv_ring.w_nr * 679 sizeof(struct rds_header), 680 ic->i_recv_hdrs, 681 ic->i_recv_hdrs_dma); 682 683 if (ic->i_ack) 684 ib_dma_free_coherent(dev, sizeof(struct rds_header), 685 ic->i_ack, ic->i_ack_dma); 686 687 if (ic->i_sends) 688 rds_ib_send_clear_ring(ic); 689 if (ic->i_recvs) 690 rds_ib_recv_clear_ring(ic); 691 692 if (ic->i_cm_id->qp) 693 rdma_destroy_qp(ic->i_cm_id); 694 if (ic->i_send_cq) 695 ib_destroy_cq(ic->i_send_cq); 696 if (ic->i_recv_cq) 697 ib_destroy_cq(ic->i_recv_cq); 698 rdma_destroy_id(ic->i_cm_id); 699 700 /* 701 * Move connection back to the nodev list. 702 */ 703 if (ic->rds_ibdev) 704 rds_ib_remove_conn(ic->rds_ibdev, conn); 705 706 ic->i_cm_id = NULL; 707 ic->i_pd = NULL; 708 ic->i_mr = NULL; 709 ic->i_send_cq = NULL; 710 ic->i_recv_cq = NULL; 711 ic->i_send_hdrs = NULL; 712 ic->i_recv_hdrs = NULL; 713 ic->i_ack = NULL; 714 } 715 BUG_ON(ic->rds_ibdev); 716 717 /* Clear pending transmit */ 718 if (ic->i_data_op) { 719 struct rds_message *rm; 720 721 rm = container_of(ic->i_data_op, struct rds_message, data); 722 rds_message_put(rm); 723 ic->i_data_op = NULL; 724 } 725 726 /* Clear the ACK state */ 727 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); 728#ifdef KERNEL_HAS_ATOMIC64 729 atomic64_set(&ic->i_ack_next, 0); 730#else 731 ic->i_ack_next = 0; 732#endif 733 ic->i_ack_recv = 0; 734 735 /* Clear flow control state */ 736 ic->i_flowctl = 0; 737 atomic_set(&ic->i_credits, 0); 738 739 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); 740 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); 741 742 if (ic->i_ibinc) { 743 rds_inc_put(&ic->i_ibinc->ii_inc); 744 ic->i_ibinc = NULL; 745 } 746 747 vfree(ic->i_sends); 748 ic->i_sends = NULL; 749 vfree(ic->i_recvs); 750 ic->i_recvs = NULL; 751} 752 753int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) 754{ 755 struct rds_ib_connection *ic; 756 unsigned long flags; 757 int ret; 758 759 /* XXX too lazy? */ 760 ic = kzalloc(sizeof(struct rds_ib_connection), gfp); 761 if (!ic) 762 return -ENOMEM; 763 764 ret = rds_ib_recv_alloc_caches(ic); 765 if (ret) { 766 kfree(ic); 767 return ret; 768 } 769 770 INIT_LIST_HEAD(&ic->ib_node); 771 tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn, 772 (unsigned long) ic); 773 mutex_init(&ic->i_recv_mutex); 774#ifndef KERNEL_HAS_ATOMIC64 775 spin_lock_init(&ic->i_ack_lock); 776#endif 777 atomic_set(&ic->i_signaled_sends, 0); 778 779 /* 780 * rds_ib_conn_shutdown() waits for these to be emptied so they 781 * must be initialized before it can be called. 782 */ 783 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); 784 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); 785 786 ic->conn = conn; 787 conn->c_transport_data = ic; 788 789 spin_lock_irqsave(&ib_nodev_conns_lock, flags); 790 list_add_tail(&ic->ib_node, &ib_nodev_conns); 791 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags); 792 793 794 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); 795 return 0; 796} 797 798/* 799 * Free a connection. Connection must be shut down and not set for reconnect. 800 */ 801void rds_ib_conn_free(void *arg) 802{ 803 struct rds_ib_connection *ic = arg; 804 spinlock_t *lock_ptr; 805 806 rdsdebug("ic %p\n", ic); 807 808 /* 809 * Conn is either on a dev's list or on the nodev list. 810 * A race with shutdown() or connect() would cause problems 811 * (since rds_ibdev would change) but that should never happen. 812 */ 813 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock; 814 815 spin_lock_irq(lock_ptr); 816 list_del(&ic->ib_node); 817 spin_unlock_irq(lock_ptr); 818 819 rds_ib_recv_free_caches(ic); 820 821 kfree(ic); 822} 823 824 825/* 826 * An error occurred on the connection 827 */ 828void 829__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...) 830{ 831 va_list ap; 832 833 rds_conn_drop(conn); 834 835 va_start(ap, fmt); 836 vprintk(fmt, ap); 837 va_end(ap); 838} 839