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 "iw.h" 41 42/* 43 * Set the selected protocol version 44 */ 45static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version) 46{ 47 conn->c_version = version; 48} 49 50/* 51 * Set up flow control 52 */ 53static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits) 54{ 55 struct rds_iw_connection *ic = conn->c_transport_data; 56 57 if (rds_iw_sysctl_flow_control && credits != 0) { 58 /* We're doing flow control */ 59 ic->i_flowctl = 1; 60 rds_iw_send_add_credits(conn, credits); 61 } else { 62 ic->i_flowctl = 0; 63 } 64} 65 66/* 67 * Connection established. 68 * We get here for both outgoing and incoming connection. 69 */ 70void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) 71{ 72 const struct rds_iw_connect_private *dp = NULL; 73 struct rds_iw_connection *ic = conn->c_transport_data; 74 struct rds_iw_device *rds_iwdev; 75 int err; 76 77 if (event->param.conn.private_data_len) { 78 dp = event->param.conn.private_data; 79 80 rds_iw_set_protocol(conn, 81 RDS_PROTOCOL(dp->dp_protocol_major, 82 dp->dp_protocol_minor)); 83 rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); 84 } 85 86 /* update ib_device with this local ipaddr & conn */ 87 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); 88 err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id); 89 if (err) 90 printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err); 91 rds_iw_add_conn(rds_iwdev, conn); 92 93 /* If the peer gave us the last packet it saw, process this as if 94 * we had received a regular ACK. */ 95 if (dp && dp->dp_ack_seq) 96 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); 97 98 printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n", 99 &conn->c_laddr, &conn->c_faddr, 100 RDS_PROTOCOL_MAJOR(conn->c_version), 101 RDS_PROTOCOL_MINOR(conn->c_version), 102 ic->i_flowctl ? ", flow control" : ""); 103 104 rds_connect_complete(conn); 105} 106 107static void rds_iw_cm_fill_conn_param(struct rds_connection *conn, 108 struct rdma_conn_param *conn_param, 109 struct rds_iw_connect_private *dp, 110 u32 protocol_version) 111{ 112 struct rds_iw_connection *ic = conn->c_transport_data; 113 114 memset(conn_param, 0, sizeof(struct rdma_conn_param)); 115 /* XXX tune these? */ 116 conn_param->responder_resources = 1; 117 conn_param->initiator_depth = 1; 118 119 if (dp) { 120 memset(dp, 0, sizeof(*dp)); 121 dp->dp_saddr = conn->c_laddr; 122 dp->dp_daddr = conn->c_faddr; 123 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); 124 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); 125 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS); 126 dp->dp_ack_seq = rds_iw_piggyb_ack(ic); 127 128 /* Advertise flow control */ 129 if (ic->i_flowctl) { 130 unsigned int credits; 131 132 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); 133 dp->dp_credit = cpu_to_be32(credits); 134 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); 135 } 136 137 conn_param->private_data = dp; 138 conn_param->private_data_len = sizeof(*dp); 139 } 140} 141 142static void rds_iw_cq_event_handler(struct ib_event *event, void *data) 143{ 144 rdsdebug("event %u data %p\n", event->event, data); 145} 146 147static void rds_iw_qp_event_handler(struct ib_event *event, void *data) 148{ 149 struct rds_connection *conn = data; 150 struct rds_iw_connection *ic = conn->c_transport_data; 151 152 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event); 153 154 switch (event->event) { 155 case IB_EVENT_COMM_EST: 156 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); 157 break; 158 case IB_EVENT_QP_REQ_ERR: 159 case IB_EVENT_QP_FATAL: 160 default: 161 rdsdebug("Fatal QP Event %u " 162 "- connection %pI4->%pI4, reconnecting\n", 163 event->event, &conn->c_laddr, 164 &conn->c_faddr); 165 rds_conn_drop(conn); 166 break; 167 } 168} 169 170/* 171 * Create a QP 172 */ 173static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr, 174 struct rds_iw_device *rds_iwdev, 175 struct rds_iw_work_ring *send_ring, 176 void (*send_cq_handler)(struct ib_cq *, void *), 177 struct rds_iw_work_ring *recv_ring, 178 void (*recv_cq_handler)(struct ib_cq *, void *), 179 void *context) 180{ 181 struct ib_device *dev = rds_iwdev->dev; 182 unsigned int send_size, recv_size; 183 int ret; 184 185 /* The offset of 1 is to accommodate the additional ACK WR. */ 186 send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1); 187 recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1); 188 rds_iw_ring_resize(send_ring, send_size - 1); 189 rds_iw_ring_resize(recv_ring, recv_size - 1); 190 191 memset(attr, 0, sizeof(*attr)); 192 attr->event_handler = rds_iw_qp_event_handler; 193 attr->qp_context = context; 194 attr->cap.max_send_wr = send_size; 195 attr->cap.max_recv_wr = recv_size; 196 attr->cap.max_send_sge = rds_iwdev->max_sge; 197 attr->cap.max_recv_sge = RDS_IW_RECV_SGE; 198 attr->sq_sig_type = IB_SIGNAL_REQ_WR; 199 attr->qp_type = IB_QPT_RC; 200 201 attr->send_cq = ib_create_cq(dev, send_cq_handler, 202 rds_iw_cq_event_handler, 203 context, send_size, 0); 204 if (IS_ERR(attr->send_cq)) { 205 ret = PTR_ERR(attr->send_cq); 206 attr->send_cq = NULL; 207 rdsdebug("ib_create_cq send failed: %d\n", ret); 208 goto out; 209 } 210 211 attr->recv_cq = ib_create_cq(dev, recv_cq_handler, 212 rds_iw_cq_event_handler, 213 context, recv_size, 0); 214 if (IS_ERR(attr->recv_cq)) { 215 ret = PTR_ERR(attr->recv_cq); 216 attr->recv_cq = NULL; 217 rdsdebug("ib_create_cq send failed: %d\n", ret); 218 goto out; 219 } 220 221 ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP); 222 if (ret) { 223 rdsdebug("ib_req_notify_cq send failed: %d\n", ret); 224 goto out; 225 } 226 227 ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED); 228 if (ret) { 229 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); 230 goto out; 231 } 232 233out: 234 if (ret) { 235 if (attr->send_cq) 236 ib_destroy_cq(attr->send_cq); 237 if (attr->recv_cq) 238 ib_destroy_cq(attr->recv_cq); 239 } 240 return ret; 241} 242 243/* 244 * This needs to be very careful to not leave IS_ERR pointers around for 245 * cleanup to trip over. 246 */ 247static int rds_iw_setup_qp(struct rds_connection *conn) 248{ 249 struct rds_iw_connection *ic = conn->c_transport_data; 250 struct ib_device *dev = ic->i_cm_id->device; 251 struct ib_qp_init_attr attr; 252 struct rds_iw_device *rds_iwdev; 253 int ret; 254 255 /* rds_iw_add_one creates a rds_iw_device object per IB device, 256 * and allocates a protection domain, memory range and MR pool 257 * for each. If that fails for any reason, it will not register 258 * the rds_iwdev at all. 259 */ 260 rds_iwdev = ib_get_client_data(dev, &rds_iw_client); 261 if (!rds_iwdev) { 262 printk_ratelimited(KERN_NOTICE "RDS/IW: No client_data for device %s\n", 263 dev->name); 264 return -EOPNOTSUPP; 265 } 266 267 /* Protection domain and memory range */ 268 ic->i_pd = rds_iwdev->pd; 269 ic->i_mr = rds_iwdev->mr; 270 271 ret = rds_iw_init_qp_attrs(&attr, rds_iwdev, 272 &ic->i_send_ring, rds_iw_send_cq_comp_handler, 273 &ic->i_recv_ring, rds_iw_recv_cq_comp_handler, 274 conn); 275 if (ret < 0) 276 goto out; 277 278 ic->i_send_cq = attr.send_cq; 279 ic->i_recv_cq = attr.recv_cq; 280 281 /* 282 * XXX this can fail if max_*_wr is too large? Are we supposed 283 * to back off until we get a value that the hardware can support? 284 */ 285 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); 286 if (ret) { 287 rdsdebug("rdma_create_qp failed: %d\n", ret); 288 goto out; 289 } 290 291 ic->i_send_hdrs = ib_dma_alloc_coherent(dev, 292 ic->i_send_ring.w_nr * 293 sizeof(struct rds_header), 294 &ic->i_send_hdrs_dma, GFP_KERNEL); 295 if (!ic->i_send_hdrs) { 296 ret = -ENOMEM; 297 rdsdebug("ib_dma_alloc_coherent send failed\n"); 298 goto out; 299 } 300 301 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, 302 ic->i_recv_ring.w_nr * 303 sizeof(struct rds_header), 304 &ic->i_recv_hdrs_dma, GFP_KERNEL); 305 if (!ic->i_recv_hdrs) { 306 ret = -ENOMEM; 307 rdsdebug("ib_dma_alloc_coherent recv failed\n"); 308 goto out; 309 } 310 311 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), 312 &ic->i_ack_dma, GFP_KERNEL); 313 if (!ic->i_ack) { 314 ret = -ENOMEM; 315 rdsdebug("ib_dma_alloc_coherent ack failed\n"); 316 goto out; 317 } 318 319 ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work)); 320 if (!ic->i_sends) { 321 ret = -ENOMEM; 322 rdsdebug("send allocation failed\n"); 323 goto out; 324 } 325 rds_iw_send_init_ring(ic); 326 327 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work)); 328 if (!ic->i_recvs) { 329 ret = -ENOMEM; 330 rdsdebug("recv allocation failed\n"); 331 goto out; 332 } 333 334 rds_iw_recv_init_ring(ic); 335 rds_iw_recv_init_ack(ic); 336 337 /* Post receive buffers - as a side effect, this will update 338 * the posted credit count. */ 339 rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1); 340 341 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr, 342 ic->i_send_cq, ic->i_recv_cq); 343 344out: 345 return ret; 346} 347 348static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp) 349{ 350 u16 common; 351 u32 version = 0; 352 353 /* rdma_cm private data is odd - when there is any private data in the 354 * request, we will be given a pretty large buffer without telling us the 355 * original size. The only way to tell the difference is by looking at 356 * the contents, which are initialized to zero. 357 * If the protocol version fields aren't set, this is a connection attempt 358 * from an older version. This could could be 3.0 or 2.0 - we can't tell. 359 * We really should have changed this for OFED 1.3 :-( */ 360 if (dp->dp_protocol_major == 0) 361 return RDS_PROTOCOL_3_0; 362 363 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS; 364 if (dp->dp_protocol_major == 3 && common) { 365 version = RDS_PROTOCOL_3_0; 366 while ((common >>= 1) != 0) 367 version++; 368 } 369 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using " 370 "incompatible protocol version %u.%u\n", 371 &dp->dp_saddr, 372 dp->dp_protocol_major, 373 dp->dp_protocol_minor); 374 return version; 375} 376 377int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id, 378 struct rdma_cm_event *event) 379{ 380 const struct rds_iw_connect_private *dp = event->param.conn.private_data; 381 struct rds_iw_connect_private dp_rep; 382 struct rds_connection *conn = NULL; 383 struct rds_iw_connection *ic = NULL; 384 struct rdma_conn_param conn_param; 385 struct rds_iw_device *rds_iwdev; 386 u32 version; 387 int err, destroy = 1; 388 389 /* Check whether the remote protocol version matches ours. */ 390 version = rds_iw_protocol_compatible(dp); 391 if (!version) 392 goto out; 393 394 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n", 395 &dp->dp_saddr, &dp->dp_daddr, 396 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version)); 397 398 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport, 399 GFP_KERNEL); 400 if (IS_ERR(conn)) { 401 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); 402 conn = NULL; 403 goto out; 404 } 405 406 /* 407 * The connection request may occur while the 408 * previous connection exist, e.g. in case of failover. 409 * But as connections may be initiated simultaneously 410 * by both hosts, we have a random backoff mechanism - 411 * see the comment above rds_queue_reconnect() 412 */ 413 mutex_lock(&conn->c_cm_lock); 414 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { 415 if (rds_conn_state(conn) == RDS_CONN_UP) { 416 rdsdebug("incoming connect while connecting\n"); 417 rds_conn_drop(conn); 418 rds_iw_stats_inc(s_iw_listen_closed_stale); 419 } else 420 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { 421 /* Wait and see - our connect may still be succeeding */ 422 rds_iw_stats_inc(s_iw_connect_raced); 423 } 424 mutex_unlock(&conn->c_cm_lock); 425 goto out; 426 } 427 428 ic = conn->c_transport_data; 429 430 rds_iw_set_protocol(conn, version); 431 rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); 432 433 /* If the peer gave us the last packet it saw, process this as if 434 * we had received a regular ACK. */ 435 if (dp->dp_ack_seq) 436 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); 437 438 BUG_ON(cm_id->context); 439 BUG_ON(ic->i_cm_id); 440 441 ic->i_cm_id = cm_id; 442 cm_id->context = conn; 443 444 rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client); 445 ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey; 446 447 /* We got halfway through setting up the ib_connection, if we 448 * fail now, we have to take the long route out of this mess. */ 449 destroy = 0; 450 451 err = rds_iw_setup_qp(conn); 452 if (err) { 453 rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err); 454 mutex_unlock(&conn->c_cm_lock); 455 goto out; 456 } 457 458 rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version); 459 460 /* rdma_accept() calls rdma_reject() internally if it fails */ 461 err = rdma_accept(cm_id, &conn_param); 462 mutex_unlock(&conn->c_cm_lock); 463 if (err) { 464 rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err); 465 goto out; 466 } 467 468 return 0; 469 470out: 471 rdma_reject(cm_id, NULL, 0); 472 return destroy; 473} 474 475 476int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id) 477{ 478 struct rds_connection *conn = cm_id->context; 479 struct rds_iw_connection *ic = conn->c_transport_data; 480 struct rdma_conn_param conn_param; 481 struct rds_iw_connect_private dp; 482 int ret; 483 484 /* If the peer doesn't do protocol negotiation, we must 485 * default to RDSv3.0 */ 486 rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0); 487 ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */ 488 489 ret = rds_iw_setup_qp(conn); 490 if (ret) { 491 rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret); 492 goto out; 493 } 494 495 rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION); 496 497 ret = rdma_connect(cm_id, &conn_param); 498 if (ret) 499 rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret); 500 501out: 502 /* Beware - returning non-zero tells the rdma_cm to destroy 503 * the cm_id. We should certainly not do it as long as we still 504 * "own" the cm_id. */ 505 if (ret) { 506 struct rds_iw_connection *ic = conn->c_transport_data; 507 508 if (ic->i_cm_id == cm_id) 509 ret = 0; 510 } 511 return ret; 512} 513 514int rds_iw_conn_connect(struct rds_connection *conn) 515{ 516 struct rds_iw_connection *ic = conn->c_transport_data; 517 struct rds_iw_device *rds_iwdev; 518 struct sockaddr_in src, dest; 519 int ret; 520 521 /* XXX I wonder what affect the port space has */ 522 /* delegate cm event handler to rdma_transport */ 523 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn, 524 RDMA_PS_TCP, IB_QPT_RC); 525 if (IS_ERR(ic->i_cm_id)) { 526 ret = PTR_ERR(ic->i_cm_id); 527 ic->i_cm_id = NULL; 528 rdsdebug("rdma_create_id() failed: %d\n", ret); 529 goto out; 530 } 531 532 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); 533 534 src.sin_family = AF_INET; 535 src.sin_addr.s_addr = (__force u32)conn->c_laddr; 536 src.sin_port = (__force u16)htons(0); 537 538 /* First, bind to the local address and device. */ 539 ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src); 540 if (ret) { 541 rdsdebug("rdma_bind_addr(%pI4) failed: %d\n", 542 &conn->c_laddr, ret); 543 rdma_destroy_id(ic->i_cm_id); 544 ic->i_cm_id = NULL; 545 goto out; 546 } 547 548 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); 549 ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey; 550 551 dest.sin_family = AF_INET; 552 dest.sin_addr.s_addr = (__force u32)conn->c_faddr; 553 dest.sin_port = (__force u16)htons(RDS_PORT); 554 555 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, 556 (struct sockaddr *)&dest, 557 RDS_RDMA_RESOLVE_TIMEOUT_MS); 558 if (ret) { 559 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, 560 ret); 561 rdma_destroy_id(ic->i_cm_id); 562 ic->i_cm_id = NULL; 563 } 564 565out: 566 return ret; 567} 568 569/* 570 * This is so careful about only cleaning up resources that were built up 571 * so that it can be called at any point during startup. In fact it 572 * can be called multiple times for a given connection. 573 */ 574void rds_iw_conn_shutdown(struct rds_connection *conn) 575{ 576 struct rds_iw_connection *ic = conn->c_transport_data; 577 int err = 0; 578 struct ib_qp_attr qp_attr; 579 580 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, 581 ic->i_pd, ic->i_send_cq, ic->i_recv_cq, 582 ic->i_cm_id ? ic->i_cm_id->qp : NULL); 583 584 if (ic->i_cm_id) { 585 struct ib_device *dev = ic->i_cm_id->device; 586 587 rdsdebug("disconnecting cm %p\n", ic->i_cm_id); 588 err = rdma_disconnect(ic->i_cm_id); 589 if (err) { 590 /* Actually this may happen quite frequently, when 591 * an outgoing connect raced with an incoming connect. 592 */ 593 rdsdebug("failed to disconnect, cm: %p err %d\n", 594 ic->i_cm_id, err); 595 } 596 597 if (ic->i_cm_id->qp) { 598 qp_attr.qp_state = IB_QPS_ERR; 599 ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); 600 } 601 602 wait_event(rds_iw_ring_empty_wait, 603 rds_iw_ring_empty(&ic->i_send_ring) && 604 rds_iw_ring_empty(&ic->i_recv_ring)); 605 606 if (ic->i_send_hdrs) 607 ib_dma_free_coherent(dev, 608 ic->i_send_ring.w_nr * 609 sizeof(struct rds_header), 610 ic->i_send_hdrs, 611 ic->i_send_hdrs_dma); 612 613 if (ic->i_recv_hdrs) 614 ib_dma_free_coherent(dev, 615 ic->i_recv_ring.w_nr * 616 sizeof(struct rds_header), 617 ic->i_recv_hdrs, 618 ic->i_recv_hdrs_dma); 619 620 if (ic->i_ack) 621 ib_dma_free_coherent(dev, sizeof(struct rds_header), 622 ic->i_ack, ic->i_ack_dma); 623 624 if (ic->i_sends) 625 rds_iw_send_clear_ring(ic); 626 if (ic->i_recvs) 627 rds_iw_recv_clear_ring(ic); 628 629 if (ic->i_cm_id->qp) 630 rdma_destroy_qp(ic->i_cm_id); 631 if (ic->i_send_cq) 632 ib_destroy_cq(ic->i_send_cq); 633 if (ic->i_recv_cq) 634 ib_destroy_cq(ic->i_recv_cq); 635 636 /* 637 * If associated with an rds_iw_device: 638 * Move connection back to the nodev list. 639 * Remove cm_id from the device cm_id list. 640 */ 641 if (ic->rds_iwdev) 642 rds_iw_remove_conn(ic->rds_iwdev, conn); 643 644 rdma_destroy_id(ic->i_cm_id); 645 646 ic->i_cm_id = NULL; 647 ic->i_pd = NULL; 648 ic->i_mr = NULL; 649 ic->i_send_cq = NULL; 650 ic->i_recv_cq = NULL; 651 ic->i_send_hdrs = NULL; 652 ic->i_recv_hdrs = NULL; 653 ic->i_ack = NULL; 654 } 655 BUG_ON(ic->rds_iwdev); 656 657 /* Clear pending transmit */ 658 if (ic->i_rm) { 659 rds_message_put(ic->i_rm); 660 ic->i_rm = NULL; 661 } 662 663 /* Clear the ACK state */ 664 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); 665#ifdef KERNEL_HAS_ATOMIC64 666 atomic64_set(&ic->i_ack_next, 0); 667#else 668 ic->i_ack_next = 0; 669#endif 670 ic->i_ack_recv = 0; 671 672 /* Clear flow control state */ 673 ic->i_flowctl = 0; 674 atomic_set(&ic->i_credits, 0); 675 676 rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr); 677 rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr); 678 679 if (ic->i_iwinc) { 680 rds_inc_put(&ic->i_iwinc->ii_inc); 681 ic->i_iwinc = NULL; 682 } 683 684 vfree(ic->i_sends); 685 ic->i_sends = NULL; 686 vfree(ic->i_recvs); 687 ic->i_recvs = NULL; 688 rdsdebug("shutdown complete\n"); 689} 690 691int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp) 692{ 693 struct rds_iw_connection *ic; 694 unsigned long flags; 695 696 /* XXX too lazy? */ 697 ic = kzalloc(sizeof(struct rds_iw_connection), gfp); 698 if (!ic) 699 return -ENOMEM; 700 701 INIT_LIST_HEAD(&ic->iw_node); 702 tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn, 703 (unsigned long) ic); 704 mutex_init(&ic->i_recv_mutex); 705#ifndef KERNEL_HAS_ATOMIC64 706 spin_lock_init(&ic->i_ack_lock); 707#endif 708 709 /* 710 * rds_iw_conn_shutdown() waits for these to be emptied so they 711 * must be initialized before it can be called. 712 */ 713 rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr); 714 rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr); 715 716 ic->conn = conn; 717 conn->c_transport_data = ic; 718 719 spin_lock_irqsave(&iw_nodev_conns_lock, flags); 720 list_add_tail(&ic->iw_node, &iw_nodev_conns); 721 spin_unlock_irqrestore(&iw_nodev_conns_lock, flags); 722 723 724 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); 725 return 0; 726} 727 728/* 729 * Free a connection. Connection must be shut down and not set for reconnect. 730 */ 731void rds_iw_conn_free(void *arg) 732{ 733 struct rds_iw_connection *ic = arg; 734 spinlock_t *lock_ptr; 735 736 rdsdebug("ic %p\n", ic); 737 738 /* 739 * Conn is either on a dev's list or on the nodev list. 740 * A race with shutdown() or connect() would cause problems 741 * (since rds_iwdev would change) but that should never happen. 742 */ 743 lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock; 744 745 spin_lock_irq(lock_ptr); 746 list_del(&ic->iw_node); 747 spin_unlock_irq(lock_ptr); 748 749 kfree(ic); 750} 751 752/* 753 * An error occurred on the connection 754 */ 755void 756__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...) 757{ 758 va_list ap; 759 760 rds_conn_drop(conn); 761 762 va_start(ap, fmt); 763 vprintk(fmt, ap); 764 va_end(ap); 765} 766