ipoib_cm.c revision 331769
1/* 2 * Copyright (c) 2006 Mellanox Technologies. 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 "ipoib.h" 34 35#ifdef CONFIG_INFINIBAND_IPOIB_CM 36 37#include <netinet/ip.h> 38#include <netinet/ip_icmp.h> 39#include <netinet/icmp6.h> 40 41#include <rdma/ib_cm.h> 42#include <rdma/ib_cache.h> 43#include <linux/delay.h> 44 45int ipoib_max_conn_qp = 128; 46 47module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 48MODULE_PARM_DESC(max_nonsrq_conn_qp, 49 "Max number of connected-mode QPs per interface " 50 "(applied only if shared receive queue is not available)"); 51 52#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 53static int data_debug_level; 54 55module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 56MODULE_PARM_DESC(cm_data_debug_level, 57 "Enable data path debug tracing for connected mode if > 0"); 58#endif 59 60#define IPOIB_CM_IETF_ID 0x1000000000000000ULL 61 62#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 63#define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 64#define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 65#define IPOIB_CM_RX_UPDATE_MASK (0x3) 66 67static struct ib_qp_attr ipoib_cm_err_attr = { 68 .qp_state = IB_QPS_ERR 69}; 70 71#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 72 73static struct ib_send_wr ipoib_cm_rx_drain_wr = { 74 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 75 .opcode = IB_WR_SEND, 76}; 77 78static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 79 struct ib_cm_event *event); 80 81static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) 82{ 83 84 ipoib_dma_unmap_rx(priv, (struct ipoib_rx_buf *)rx_req); 85 86} 87 88static int ipoib_cm_post_receive_srq(struct ipoib_dev_priv *priv, int id) 89{ 90 struct ib_recv_wr *bad_wr; 91 struct ipoib_rx_buf *rx_req; 92 struct mbuf *m; 93 int ret; 94 int i; 95 96 rx_req = (struct ipoib_rx_buf *)&priv->cm.srq_ring[id]; 97 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { 98 priv->cm.rx_sge[i].addr = rx_req->mapping[i]; 99 priv->cm.rx_sge[i].length = m->m_len; 100 } 101 102 priv->cm.rx_wr.num_sge = i; 103 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 104 105 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 106 if (unlikely(ret)) { 107 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 108 ipoib_dma_unmap_rx(priv, rx_req); 109 m_freem(priv->cm.srq_ring[id].mb); 110 priv->cm.srq_ring[id].mb = NULL; 111 } 112 113 return ret; 114} 115 116static int ipoib_cm_post_receive_nonsrq(struct ipoib_dev_priv *priv, 117 struct ipoib_cm_rx *rx, 118 struct ib_recv_wr *wr, 119 struct ib_sge *sge, int id) 120{ 121 struct ipoib_rx_buf *rx_req; 122 struct ib_recv_wr *bad_wr; 123 struct mbuf *m; 124 int ret; 125 int i; 126 127 rx_req = (struct ipoib_rx_buf *)&rx->rx_ring[id]; 128 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { 129 sge[i].addr = rx_req->mapping[i]; 130 sge[i].length = m->m_len; 131 } 132 133 wr->num_sge = i; 134 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 135 136 ret = ib_post_recv(rx->qp, wr, &bad_wr); 137 if (unlikely(ret)) { 138 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 139 ipoib_dma_unmap_rx(priv, rx_req); 140 m_freem(rx->rx_ring[id].mb); 141 rx->rx_ring[id].mb = NULL; 142 } 143 144 return ret; 145} 146 147static struct mbuf * 148ipoib_cm_alloc_rx_mb(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) 149{ 150 return ipoib_alloc_map_mb(priv, (struct ipoib_rx_buf *)rx_req, 151 priv->cm.max_cm_mtu); 152} 153 154static void ipoib_cm_free_rx_ring(struct ipoib_dev_priv *priv, 155 struct ipoib_cm_rx_buf *rx_ring) 156{ 157 int i; 158 159 for (i = 0; i < ipoib_recvq_size; ++i) 160 if (rx_ring[i].mb) { 161 ipoib_cm_dma_unmap_rx(priv, &rx_ring[i]); 162 m_freem(rx_ring[i].mb); 163 } 164 165 kfree(rx_ring); 166} 167 168static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 169{ 170 struct ib_send_wr *bad_wr; 171 struct ipoib_cm_rx *p; 172 173 /* We only reserved 1 extra slot in CQ for drain WRs, so 174 * make sure we have at most 1 outstanding WR. */ 175 if (list_empty(&priv->cm.rx_flush_list) || 176 !list_empty(&priv->cm.rx_drain_list)) 177 return; 178 179 /* 180 * QPs on flush list are error state. This way, a "flush 181 * error" WC will be immediately generated for each WR we post. 182 */ 183 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 184 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 185 ipoib_warn(priv, "failed to post drain wr\n"); 186 187 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 188} 189 190static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 191{ 192 struct ipoib_cm_rx *p = ctx; 193 struct ipoib_dev_priv *priv = p->priv; 194 unsigned long flags; 195 196 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 197 return; 198 199 spin_lock_irqsave(&priv->lock, flags); 200 list_move(&p->list, &priv->cm.rx_flush_list); 201 p->state = IPOIB_CM_RX_FLUSH; 202 ipoib_cm_start_rx_drain(priv); 203 spin_unlock_irqrestore(&priv->lock, flags); 204} 205 206static struct ib_qp *ipoib_cm_create_rx_qp(struct ipoib_dev_priv *priv, 207 struct ipoib_cm_rx *p) 208{ 209 struct ib_qp_init_attr attr = { 210 .event_handler = ipoib_cm_rx_event_handler, 211 .send_cq = priv->recv_cq, /* For drain WR */ 212 .recv_cq = priv->recv_cq, 213 .srq = priv->cm.srq, 214 .cap.max_send_wr = 1, /* For drain WR */ 215 .cap.max_send_sge = 1, 216 .sq_sig_type = IB_SIGNAL_ALL_WR, 217 .qp_type = IB_QPT_RC, 218 .qp_context = p, 219 }; 220 221 if (!ipoib_cm_has_srq(priv)) { 222 attr.cap.max_recv_wr = ipoib_recvq_size; 223 attr.cap.max_recv_sge = priv->cm.num_frags; 224 } 225 226 return ib_create_qp(priv->pd, &attr); 227} 228 229static int ipoib_cm_modify_rx_qp(struct ipoib_dev_priv *priv, 230 struct ib_cm_id *cm_id, struct ib_qp *qp, 231 unsigned psn) 232{ 233 struct ib_qp_attr qp_attr; 234 int qp_attr_mask, ret; 235 236 qp_attr.qp_state = IB_QPS_INIT; 237 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 238 if (ret) { 239 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 240 return ret; 241 } 242 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 243 if (ret) { 244 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 245 return ret; 246 } 247 qp_attr.qp_state = IB_QPS_RTR; 248 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 249 if (ret) { 250 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 251 return ret; 252 } 253 qp_attr.rq_psn = psn; 254 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 255 if (ret) { 256 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 257 return ret; 258 } 259 260 /* 261 * Current Mellanox HCA firmware won't generate completions 262 * with error for drain WRs unless the QP has been moved to 263 * RTS first. This work-around leaves a window where a QP has 264 * moved to error asynchronously, but this will eventually get 265 * fixed in firmware, so let's not error out if modify QP 266 * fails. 267 */ 268 qp_attr.qp_state = IB_QPS_RTS; 269 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 270 if (ret) { 271 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 272 return 0; 273 } 274 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 275 if (ret) { 276 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 277 return 0; 278 } 279 280 return 0; 281} 282 283static void ipoib_cm_init_rx_wr(struct ipoib_dev_priv *priv, 284 struct ib_recv_wr *wr, 285 struct ib_sge *sge) 286{ 287 int i; 288 289 for (i = 0; i < IPOIB_CM_RX_SG; i++) 290 sge[i].lkey = priv->pd->local_dma_lkey; 291 292 wr->next = NULL; 293 wr->sg_list = sge; 294 wr->num_sge = 1; 295} 296 297static int ipoib_cm_nonsrq_init_rx(struct ipoib_dev_priv *priv, 298 struct ib_cm_id *cm_id, struct ipoib_cm_rx *rx) 299{ 300 struct { 301 struct ib_recv_wr wr; 302 struct ib_sge sge[IPOIB_CM_RX_SG]; 303 } *t; 304 int ret; 305 int i; 306 307 rx->rx_ring = kzalloc(ipoib_recvq_size * sizeof *rx->rx_ring, GFP_KERNEL); 308 if (!rx->rx_ring) { 309 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 310 priv->ca->name, ipoib_recvq_size); 311 return -ENOMEM; 312 } 313 314 memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring); 315 316 t = kmalloc(sizeof *t, GFP_KERNEL); 317 if (!t) { 318 ret = -ENOMEM; 319 goto err_free; 320 } 321 322 ipoib_cm_init_rx_wr(priv, &t->wr, t->sge); 323 324 spin_lock_irq(&priv->lock); 325 326 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 327 spin_unlock_irq(&priv->lock); 328 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 329 ret = -EINVAL; 330 goto err_free; 331 } else 332 ++priv->cm.nonsrq_conn_qp; 333 334 spin_unlock_irq(&priv->lock); 335 336 for (i = 0; i < ipoib_recvq_size; ++i) { 337 if (!ipoib_cm_alloc_rx_mb(priv, &rx->rx_ring[i])) { 338 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 339 ret = -ENOMEM; 340 goto err_count; 341 } 342 ret = ipoib_cm_post_receive_nonsrq(priv, rx, &t->wr, t->sge, i); 343 if (ret) { 344 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 345 "failed for buf %d\n", i); 346 ret = -EIO; 347 goto err_count; 348 } 349 } 350 351 rx->recv_count = ipoib_recvq_size; 352 353 kfree(t); 354 355 return 0; 356 357err_count: 358 spin_lock_irq(&priv->lock); 359 --priv->cm.nonsrq_conn_qp; 360 spin_unlock_irq(&priv->lock); 361 362err_free: 363 kfree(t); 364 ipoib_cm_free_rx_ring(priv, rx->rx_ring); 365 366 return ret; 367} 368 369static int ipoib_cm_send_rep(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, 370 struct ib_qp *qp, struct ib_cm_req_event_param *req, 371 unsigned psn) 372{ 373 struct ipoib_cm_data data = {}; 374 struct ib_cm_rep_param rep = {}; 375 376 data.qpn = cpu_to_be32(priv->qp->qp_num); 377 data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); 378 379 rep.private_data = &data; 380 rep.private_data_len = sizeof data; 381 rep.flow_control = 0; 382 rep.rnr_retry_count = req->rnr_retry_count; 383 rep.srq = ipoib_cm_has_srq(priv); 384 rep.qp_num = qp->qp_num; 385 rep.starting_psn = psn; 386 return ib_send_cm_rep(cm_id, &rep); 387} 388 389static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 390{ 391 struct ipoib_dev_priv *priv = cm_id->context; 392 struct ipoib_cm_rx *p; 393 unsigned psn; 394 int ret; 395 396 ipoib_dbg(priv, "REQ arrived\n"); 397 p = kzalloc(sizeof *p, GFP_KERNEL); 398 if (!p) 399 return -ENOMEM; 400 p->priv = priv; 401 p->id = cm_id; 402 cm_id->context = p; 403 p->state = IPOIB_CM_RX_LIVE; 404 p->jiffies = jiffies; 405 INIT_LIST_HEAD(&p->list); 406 407 p->qp = ipoib_cm_create_rx_qp(priv, p); 408 if (IS_ERR(p->qp)) { 409 ret = PTR_ERR(p->qp); 410 goto err_qp; 411 } 412 413 psn = random() & 0xffffff; 414 ret = ipoib_cm_modify_rx_qp(priv, cm_id, p->qp, psn); 415 if (ret) 416 goto err_modify; 417 418 if (!ipoib_cm_has_srq(priv)) { 419 ret = ipoib_cm_nonsrq_init_rx(priv, cm_id, p); 420 if (ret) 421 goto err_modify; 422 } 423 424 spin_lock_irq(&priv->lock); 425 queue_delayed_work(ipoib_workqueue, 426 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 427 /* Add this entry to passive ids list head, but do not re-add it 428 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 429 p->jiffies = jiffies; 430 if (p->state == IPOIB_CM_RX_LIVE) 431 list_move(&p->list, &priv->cm.passive_ids); 432 spin_unlock_irq(&priv->lock); 433 434 ret = ipoib_cm_send_rep(priv, cm_id, p->qp, &event->param.req_rcvd, psn); 435 if (ret) { 436 ipoib_warn(priv, "failed to send REP: %d\n", ret); 437 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 438 ipoib_warn(priv, "unable to move qp to error state\n"); 439 } 440 return 0; 441 442err_modify: 443 ib_destroy_qp(p->qp); 444err_qp: 445 kfree(p); 446 return ret; 447} 448 449static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 450 struct ib_cm_event *event) 451{ 452 struct ipoib_cm_rx *p; 453 struct ipoib_dev_priv *priv; 454 455 switch (event->event) { 456 case IB_CM_REQ_RECEIVED: 457 return ipoib_cm_req_handler(cm_id, event); 458 case IB_CM_DREQ_RECEIVED: 459 p = cm_id->context; 460 ib_send_cm_drep(cm_id, NULL, 0); 461 /* Fall through */ 462 case IB_CM_REJ_RECEIVED: 463 p = cm_id->context; 464 priv = p->priv; 465 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 466 ipoib_warn(priv, "unable to move qp to error state\n"); 467 /* Fall through */ 468 default: 469 return 0; 470 } 471} 472 473void ipoib_cm_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) 474{ 475 struct ipoib_cm_rx_buf saverx; 476 struct ipoib_cm_rx_buf *rx_ring; 477 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 478 struct ifnet *dev = priv->dev; 479 struct mbuf *mb, *newmb; 480 struct ipoib_cm_rx *p; 481 int has_srq; 482 u_short proto; 483 484 CURVNET_SET_QUIET(dev->if_vnet); 485 486 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 487 wr_id, wc->status); 488 489 if (unlikely(wr_id >= ipoib_recvq_size)) { 490 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 491 spin_lock(&priv->lock); 492 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 493 ipoib_cm_start_rx_drain(priv); 494 if (priv->cm.id != NULL) 495 queue_work(ipoib_workqueue, 496 &priv->cm.rx_reap_task); 497 spin_unlock(&priv->lock); 498 } else 499 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 500 wr_id, ipoib_recvq_size); 501 goto done; 502 } 503 504 p = wc->qp->qp_context; 505 506 has_srq = ipoib_cm_has_srq(priv); 507 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 508 509 mb = rx_ring[wr_id].mb; 510 511 if (unlikely(wc->status != IB_WC_SUCCESS)) { 512 ipoib_dbg(priv, "cm recv error " 513 "(status=%d, wrid=%d vend_err %x)\n", 514 wc->status, wr_id, wc->vendor_err); 515 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 516 if (has_srq) 517 goto repost; 518 else { 519 if (!--p->recv_count) { 520 spin_lock(&priv->lock); 521 list_move(&p->list, &priv->cm.rx_reap_list); 522 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 523 spin_unlock(&priv->lock); 524 } 525 goto done; 526 } 527 } 528 529 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 530 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 531 p->jiffies = jiffies; 532 /* Move this entry to list head, but do not re-add it 533 * if it has been moved out of list. */ 534 if (p->state == IPOIB_CM_RX_LIVE) 535 list_move(&p->list, &priv->cm.passive_ids); 536 } 537 } 538 539 memcpy(&saverx, &rx_ring[wr_id], sizeof(saverx)); 540 newmb = ipoib_cm_alloc_rx_mb(priv, &rx_ring[wr_id]); 541 if (unlikely(!newmb)) { 542 /* 543 * If we can't allocate a new RX buffer, dump 544 * this packet and reuse the old buffer. 545 */ 546 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 547 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 548 memcpy(&rx_ring[wr_id], &saverx, sizeof(saverx)); 549 goto repost; 550 } 551 552 ipoib_cm_dma_unmap_rx(priv, &saverx); 553 554 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 555 wc->byte_len, wc->slid); 556 557 ipoib_dma_mb(priv, mb, wc->byte_len); 558 559 if_inc_counter(dev, IFCOUNTER_IPACKETS, 1); 560 if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len); 561 562 mb->m_pkthdr.rcvif = dev; 563 proto = *mtod(mb, uint16_t *); 564 m_adj(mb, IPOIB_ENCAP_LEN); 565 566 IPOIB_MTAP_PROTO(dev, mb, proto); 567 ipoib_demux(dev, mb, ntohs(proto)); 568 569repost: 570 if (has_srq) { 571 if (unlikely(ipoib_cm_post_receive_srq(priv, wr_id))) 572 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 573 "for buf %d\n", wr_id); 574 } else { 575 if (unlikely(ipoib_cm_post_receive_nonsrq(priv, p, 576 &priv->cm.rx_wr, 577 priv->cm.rx_sge, 578 wr_id))) { 579 --p->recv_count; 580 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 581 "for buf %d\n", wr_id); 582 } 583 } 584done: 585 CURVNET_RESTORE(); 586 return; 587} 588 589static inline int post_send(struct ipoib_dev_priv *priv, 590 struct ipoib_cm_tx *tx, 591 struct ipoib_cm_tx_buf *tx_req, 592 unsigned int wr_id) 593{ 594 struct ib_send_wr *bad_wr; 595 struct mbuf *mb = tx_req->mb; 596 u64 *mapping = tx_req->mapping; 597 struct mbuf *m; 598 int i; 599 600 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) { 601 priv->tx_sge[i].addr = mapping[i]; 602 priv->tx_sge[i].length = m->m_len; 603 } 604 priv->tx_wr.wr.num_sge = i; 605 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 606 priv->tx_wr.wr.opcode = IB_WR_SEND; 607 608 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); 609} 610 611void ipoib_cm_send(struct ipoib_dev_priv *priv, struct mbuf *mb, struct ipoib_cm_tx *tx) 612{ 613 struct ipoib_cm_tx_buf *tx_req; 614 struct ifnet *dev = priv->dev; 615 616 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 617 while (ipoib_poll_tx(priv)); /* nothing */ 618 619 m_adj(mb, sizeof(struct ipoib_pseudoheader)); 620 if (unlikely(mb->m_pkthdr.len > tx->mtu)) { 621 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 622 mb->m_pkthdr.len, tx->mtu); 623 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 624 ipoib_cm_mb_too_long(priv, mb, IPOIB_CM_MTU(tx->mtu)); 625 return; 626 } 627 628 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 629 tx->tx_head, mb->m_pkthdr.len, tx->qp->qp_num); 630 631 632 /* 633 * We put the mb into the tx_ring _before_ we call post_send() 634 * because it's entirely possible that the completion handler will 635 * run before we execute anything after the post_send(). That 636 * means we have to make sure everything is properly recorded and 637 * our state is consistent before we call post_send(). 638 */ 639 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 640 tx_req->mb = mb; 641 if (unlikely(ipoib_dma_map_tx(priv->ca, (struct ipoib_tx_buf *)tx_req, 642 priv->cm.num_frags))) { 643 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 644 if (tx_req->mb) 645 m_freem(tx_req->mb); 646 return; 647 } 648 649 if (unlikely(post_send(priv, tx, tx_req, tx->tx_head & (ipoib_sendq_size - 1)))) { 650 ipoib_warn(priv, "post_send failed\n"); 651 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 652 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 653 m_freem(mb); 654 } else { 655 ++tx->tx_head; 656 657 if (++priv->tx_outstanding == ipoib_sendq_size) { 658 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 659 tx->qp->qp_num); 660 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 661 ipoib_warn(priv, "request notify on send CQ failed\n"); 662 dev->if_drv_flags |= IFF_DRV_OACTIVE; 663 } 664 } 665 666} 667 668void ipoib_cm_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) 669{ 670 struct ipoib_cm_tx *tx = wc->qp->qp_context; 671 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 672 struct ifnet *dev = priv->dev; 673 struct ipoib_cm_tx_buf *tx_req; 674 675 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 676 wr_id, wc->status); 677 678 if (unlikely(wr_id >= ipoib_sendq_size)) { 679 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 680 wr_id, ipoib_sendq_size); 681 return; 682 } 683 684 tx_req = &tx->tx_ring[wr_id]; 685 686 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 687 688 /* FIXME: is this right? Shouldn't we only increment on success? */ 689 if_inc_counter(dev, IFCOUNTER_OPACKETS, 1); 690 691 m_freem(tx_req->mb); 692 693 ++tx->tx_tail; 694 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 695 (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 && 696 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 697 dev->if_drv_flags &= ~IFF_DRV_OACTIVE; 698 699 if (wc->status != IB_WC_SUCCESS && 700 wc->status != IB_WC_WR_FLUSH_ERR) { 701 struct ipoib_path *path; 702 703 ipoib_dbg(priv, "failed cm send event " 704 "(status=%d, wrid=%d vend_err %x)\n", 705 wc->status, wr_id, wc->vendor_err); 706 707 path = tx->path; 708 709 if (path) { 710 path->cm = NULL; 711 rb_erase(&path->rb_node, &priv->path_tree); 712 list_del(&path->list); 713 } 714 715 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 716 list_move(&tx->list, &priv->cm.reap_list); 717 queue_work(ipoib_workqueue, &priv->cm.reap_task); 718 } 719 720 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 721 } 722 723} 724 725int ipoib_cm_dev_open(struct ipoib_dev_priv *priv) 726{ 727 int ret; 728 729 if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev))) 730 return 0; 731 732 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv); 733 if (IS_ERR(priv->cm.id)) { 734 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 735 ret = PTR_ERR(priv->cm.id); 736 goto err_cm; 737 } 738 739 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 0); 740 if (ret) { 741 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 742 IPOIB_CM_IETF_ID | priv->qp->qp_num); 743 goto err_listen; 744 } 745 746 return 0; 747 748err_listen: 749 ib_destroy_cm_id(priv->cm.id); 750err_cm: 751 priv->cm.id = NULL; 752 return ret; 753} 754 755static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv) 756{ 757 struct ipoib_cm_rx *rx, *n; 758 LIST_HEAD(list); 759 760 spin_lock_irq(&priv->lock); 761 list_splice_init(&priv->cm.rx_reap_list, &list); 762 spin_unlock_irq(&priv->lock); 763 764 list_for_each_entry_safe(rx, n, &list, list) { 765 ib_destroy_cm_id(rx->id); 766 ib_destroy_qp(rx->qp); 767 if (!ipoib_cm_has_srq(priv)) { 768 ipoib_cm_free_rx_ring(priv, rx->rx_ring); 769 spin_lock_irq(&priv->lock); 770 --priv->cm.nonsrq_conn_qp; 771 spin_unlock_irq(&priv->lock); 772 } 773 kfree(rx); 774 } 775} 776 777void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv) 778{ 779 struct ipoib_cm_rx *p; 780 unsigned long begin; 781 int ret; 782 783 if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id) 784 return; 785 786 ib_destroy_cm_id(priv->cm.id); 787 priv->cm.id = NULL; 788 789 cancel_work_sync(&priv->cm.rx_reap_task); 790 791 spin_lock_irq(&priv->lock); 792 while (!list_empty(&priv->cm.passive_ids)) { 793 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 794 list_move(&p->list, &priv->cm.rx_error_list); 795 p->state = IPOIB_CM_RX_ERROR; 796 spin_unlock_irq(&priv->lock); 797 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 798 if (ret) 799 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 800 spin_lock_irq(&priv->lock); 801 } 802 803 /* Wait for all RX to be drained */ 804 begin = jiffies; 805 806 while (!list_empty(&priv->cm.rx_error_list) || 807 !list_empty(&priv->cm.rx_flush_list) || 808 !list_empty(&priv->cm.rx_drain_list)) { 809 if (time_after(jiffies, begin + 5 * HZ)) { 810 ipoib_warn(priv, "RX drain timing out\n"); 811 812 /* 813 * assume the HW is wedged and just free up everything. 814 */ 815 list_splice_init(&priv->cm.rx_flush_list, 816 &priv->cm.rx_reap_list); 817 list_splice_init(&priv->cm.rx_error_list, 818 &priv->cm.rx_reap_list); 819 list_splice_init(&priv->cm.rx_drain_list, 820 &priv->cm.rx_reap_list); 821 break; 822 } 823 spin_unlock_irq(&priv->lock); 824 msleep(1); 825 ipoib_drain_cq(priv); 826 spin_lock_irq(&priv->lock); 827 } 828 829 spin_unlock_irq(&priv->lock); 830 831 ipoib_cm_free_rx_reap_list(priv); 832 833 cancel_delayed_work_sync(&priv->cm.stale_task); 834} 835 836static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 837{ 838 struct ipoib_cm_tx *p = cm_id->context; 839 struct ipoib_dev_priv *priv = p->priv; 840 struct ipoib_cm_data *data = event->private_data; 841 struct ifqueue mbqueue; 842 struct ib_qp_attr qp_attr; 843 int qp_attr_mask, ret; 844 struct mbuf *mb; 845 846 ipoib_dbg(priv, "cm rep handler\n"); 847 p->mtu = be32_to_cpu(data->mtu); 848 849 if (p->mtu <= IPOIB_ENCAP_LEN) { 850 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 851 p->mtu, IPOIB_ENCAP_LEN); 852 return -EINVAL; 853 } 854 855 qp_attr.qp_state = IB_QPS_RTR; 856 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 857 if (ret) { 858 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 859 return ret; 860 } 861 862 qp_attr.rq_psn = 0 /* FIXME */; 863 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 864 if (ret) { 865 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 866 return ret; 867 } 868 869 qp_attr.qp_state = IB_QPS_RTS; 870 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 871 if (ret) { 872 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 873 return ret; 874 } 875 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 876 if (ret) { 877 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 878 return ret; 879 } 880 881 bzero(&mbqueue, sizeof(mbqueue)); 882 883 spin_lock_irq(&priv->lock); 884 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 885 if (p->path) 886 for (;;) { 887 _IF_DEQUEUE(&p->path->queue, mb); 888 if (mb == NULL) 889 break; 890 _IF_ENQUEUE(&mbqueue, mb); 891 } 892 spin_unlock_irq(&priv->lock); 893 894 for (;;) { 895 struct ifnet *dev = p->priv->dev; 896 _IF_DEQUEUE(&mbqueue, mb); 897 if (mb == NULL) 898 break; 899 mb->m_pkthdr.rcvif = dev; 900 if (dev->if_transmit(dev, mb)) 901 ipoib_warn(priv, "dev_queue_xmit failed " 902 "to requeue packet\n"); 903 } 904 905 ret = ib_send_cm_rtu(cm_id, NULL, 0); 906 if (ret) { 907 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 908 return ret; 909 } 910 return 0; 911} 912 913static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv, 914 struct ipoib_cm_tx *tx) 915{ 916 struct ib_qp_init_attr attr = { 917 .send_cq = priv->send_cq, 918 .recv_cq = priv->recv_cq, 919 .srq = priv->cm.srq, 920 .cap.max_send_wr = ipoib_sendq_size, 921 .cap.max_send_sge = priv->cm.num_frags, 922 .sq_sig_type = IB_SIGNAL_ALL_WR, 923 .qp_type = IB_QPT_RC, 924 .qp_context = tx 925 }; 926 927 return ib_create_qp(priv->pd, &attr); 928} 929 930static int ipoib_cm_send_req(struct ipoib_dev_priv *priv, 931 struct ib_cm_id *id, struct ib_qp *qp, 932 u32 qpn, 933 struct ib_sa_path_rec *pathrec) 934{ 935 struct ipoib_cm_data data = {}; 936 struct ib_cm_req_param req = {}; 937 938 ipoib_dbg(priv, "cm send req\n"); 939 940 data.qpn = cpu_to_be32(priv->qp->qp_num); 941 data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); 942 943 req.primary_path = pathrec; 944 req.alternate_path = NULL; 945 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 946 req.qp_num = qp->qp_num; 947 req.qp_type = qp->qp_type; 948 req.private_data = &data; 949 req.private_data_len = sizeof data; 950 req.flow_control = 0; 951 952 req.starting_psn = 0; /* FIXME */ 953 954 /* 955 * Pick some arbitrary defaults here; we could make these 956 * module parameters if anyone cared about setting them. 957 */ 958 req.responder_resources = 4; 959 req.remote_cm_response_timeout = 20; 960 req.local_cm_response_timeout = 20; 961 req.retry_count = 0; /* RFC draft warns against retries */ 962 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 963 req.max_cm_retries = 15; 964 req.srq = ipoib_cm_has_srq(priv); 965 return ib_send_cm_req(id, &req); 966} 967 968static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv, 969 struct ib_cm_id *cm_id, struct ib_qp *qp) 970{ 971 struct ib_qp_attr qp_attr; 972 int qp_attr_mask, ret; 973 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 974 if (ret) { 975 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 976 return ret; 977 } 978 979 qp_attr.qp_state = IB_QPS_INIT; 980 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 981 qp_attr.port_num = priv->port; 982 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 983 984 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 985 if (ret) { 986 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 987 return ret; 988 } 989 return 0; 990} 991 992static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 993 struct ib_sa_path_rec *pathrec) 994{ 995 struct ipoib_dev_priv *priv = p->priv; 996 int ret; 997 998 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL); 999 if (!p->tx_ring) { 1000 ipoib_warn(priv, "failed to allocate tx ring\n"); 1001 ret = -ENOMEM; 1002 goto err_tx; 1003 } 1004 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1005 1006 p->qp = ipoib_cm_create_tx_qp(p->priv, p); 1007 if (IS_ERR(p->qp)) { 1008 ret = PTR_ERR(p->qp); 1009 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1010 goto err_qp; 1011 } 1012 1013 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1014 if (IS_ERR(p->id)) { 1015 ret = PTR_ERR(p->id); 1016 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1017 goto err_id; 1018 } 1019 1020 ret = ipoib_cm_modify_tx_init(p->priv, p->id, p->qp); 1021 if (ret) { 1022 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1023 goto err_modify; 1024 } 1025 1026 ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec); 1027 if (ret) { 1028 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1029 goto err_send_cm; 1030 } 1031 1032 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1033 p->qp->qp_num, pathrec->dgid.raw, qpn); 1034 1035 return 0; 1036 1037err_send_cm: 1038err_modify: 1039 ib_destroy_cm_id(p->id); 1040err_id: 1041 p->id = NULL; 1042 ib_destroy_qp(p->qp); 1043err_qp: 1044 p->qp = NULL; 1045 kfree(p->tx_ring); 1046err_tx: 1047 return ret; 1048} 1049 1050static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1051{ 1052 struct ipoib_dev_priv *priv = p->priv; 1053 struct ifnet *dev = priv->dev; 1054 struct ipoib_cm_tx_buf *tx_req; 1055 unsigned long begin; 1056 1057 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1058 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1059 1060 if (p->path) 1061 ipoib_path_free(priv, p->path); 1062 1063 if (p->id) 1064 ib_destroy_cm_id(p->id); 1065 1066 if (p->tx_ring) { 1067 /* Wait for all sends to complete */ 1068 begin = jiffies; 1069 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1070 if (time_after(jiffies, begin + 5 * HZ)) { 1071 ipoib_warn(priv, "timing out; %d sends not completed\n", 1072 p->tx_head - p->tx_tail); 1073 goto timeout; 1074 } 1075 1076 msleep(1); 1077 } 1078 } 1079 1080timeout: 1081 1082 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1083 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1084 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 1085 m_freem(tx_req->mb); 1086 ++p->tx_tail; 1087 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1088 (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 && 1089 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1090 dev->if_drv_flags &= ~IFF_DRV_OACTIVE; 1091 } 1092 1093 if (p->qp) 1094 ib_destroy_qp(p->qp); 1095 1096 kfree(p->tx_ring); 1097 kfree(p); 1098} 1099 1100static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1101 struct ib_cm_event *event) 1102{ 1103 struct ipoib_cm_tx *tx = cm_id->context; 1104 struct ipoib_dev_priv *priv = tx->priv; 1105 struct ipoib_path *path; 1106 unsigned long flags; 1107 int ret; 1108 1109 switch (event->event) { 1110 case IB_CM_DREQ_RECEIVED: 1111 ipoib_dbg(priv, "DREQ received.\n"); 1112 ib_send_cm_drep(cm_id, NULL, 0); 1113 break; 1114 case IB_CM_REP_RECEIVED: 1115 ipoib_dbg(priv, "REP received.\n"); 1116 ret = ipoib_cm_rep_handler(cm_id, event); 1117 if (ret) 1118 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1119 NULL, 0, NULL, 0); 1120 break; 1121 case IB_CM_REQ_ERROR: 1122 case IB_CM_REJ_RECEIVED: 1123 case IB_CM_TIMEWAIT_EXIT: 1124 ipoib_dbg(priv, "CM error %d.\n", event->event); 1125 spin_lock_irqsave(&priv->lock, flags); 1126 path = tx->path; 1127 1128 if (path) { 1129 path->cm = NULL; 1130 tx->path = NULL; 1131 rb_erase(&path->rb_node, &priv->path_tree); 1132 list_del(&path->list); 1133 } 1134 1135 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1136 list_move(&tx->list, &priv->cm.reap_list); 1137 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1138 } 1139 1140 spin_unlock_irqrestore(&priv->lock, flags); 1141 if (path) 1142 ipoib_path_free(tx->priv, path); 1143 break; 1144 default: 1145 break; 1146 } 1147 1148 return 0; 1149} 1150 1151struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv, 1152 struct ipoib_path *path) 1153{ 1154 struct ipoib_cm_tx *tx; 1155 1156 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1157 if (!tx) 1158 return NULL; 1159 1160 ipoib_dbg(priv, "Creating cm tx\n"); 1161 path->cm = tx; 1162 tx->path = path; 1163 tx->priv = priv; 1164 list_add(&tx->list, &priv->cm.start_list); 1165 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1166 queue_work(ipoib_workqueue, &priv->cm.start_task); 1167 return tx; 1168} 1169 1170void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1171{ 1172 struct ipoib_dev_priv *priv = tx->priv; 1173 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1174 spin_lock(&priv->lock); 1175 list_move(&tx->list, &priv->cm.reap_list); 1176 spin_unlock(&priv->lock); 1177 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1178 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1179 tx->path->pathrec.dgid.raw); 1180 tx->path = NULL; 1181 } 1182} 1183 1184static void ipoib_cm_tx_start(struct work_struct *work) 1185{ 1186 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1187 cm.start_task); 1188 struct ipoib_path *path; 1189 struct ipoib_cm_tx *p; 1190 unsigned long flags; 1191 int ret; 1192 1193 struct ib_sa_path_rec pathrec; 1194 u32 qpn; 1195 1196 ipoib_dbg(priv, "cm start task\n"); 1197 spin_lock_irqsave(&priv->lock, flags); 1198 1199 while (!list_empty(&priv->cm.start_list)) { 1200 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1201 list_del_init(&p->list); 1202 path = p->path; 1203 qpn = IPOIB_QPN(path->hwaddr); 1204 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1205 1206 spin_unlock_irqrestore(&priv->lock, flags); 1207 1208 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1209 1210 spin_lock_irqsave(&priv->lock, flags); 1211 1212 if (ret) { 1213 path = p->path; 1214 if (path) { 1215 path->cm = NULL; 1216 rb_erase(&path->rb_node, &priv->path_tree); 1217 list_del(&path->list); 1218 ipoib_path_free(priv, path); 1219 } 1220 list_del(&p->list); 1221 kfree(p); 1222 } 1223 } 1224 1225 spin_unlock_irqrestore(&priv->lock, flags); 1226} 1227 1228static void ipoib_cm_tx_reap(struct work_struct *work) 1229{ 1230 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1231 cm.reap_task); 1232 struct ipoib_cm_tx *p; 1233 unsigned long flags; 1234 1235 spin_lock_irqsave(&priv->lock, flags); 1236 1237 while (!list_empty(&priv->cm.reap_list)) { 1238 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1239 list_del(&p->list); 1240 spin_unlock_irqrestore(&priv->lock, flags); 1241 ipoib_cm_tx_destroy(p); 1242 spin_lock_irqsave(&priv->lock, flags); 1243 } 1244 1245 spin_unlock_irqrestore(&priv->lock, flags); 1246} 1247 1248static void ipoib_cm_mb_reap(struct work_struct *work) 1249{ 1250 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1251 cm.mb_task); 1252 struct mbuf *mb; 1253 unsigned long flags; 1254#if defined(INET) || defined(INET6) 1255 unsigned mtu = priv->mcast_mtu; 1256#endif 1257 uint16_t proto; 1258 1259 spin_lock_irqsave(&priv->lock, flags); 1260 1261 for (;;) { 1262 IF_DEQUEUE(&priv->cm.mb_queue, mb); 1263 if (mb == NULL) 1264 break; 1265 spin_unlock_irqrestore(&priv->lock, flags); 1266 1267 proto = htons(*mtod(mb, uint16_t *)); 1268 m_adj(mb, IPOIB_ENCAP_LEN); 1269 switch (proto) { 1270#if defined(INET) 1271 case ETHERTYPE_IP: 1272 icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu); 1273 break; 1274#endif 1275#if defined(INET6) 1276 case ETHERTYPE_IPV6: 1277 icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu); 1278 break; 1279#endif 1280 default: 1281 m_freem(mb); 1282 } 1283 1284 spin_lock_irqsave(&priv->lock, flags); 1285 } 1286 1287 spin_unlock_irqrestore(&priv->lock, flags); 1288} 1289 1290void 1291ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu) 1292{ 1293 int e = priv->cm.mb_queue.ifq_len; 1294 1295 IF_ENQUEUE(&priv->cm.mb_queue, mb); 1296 if (e == 0) 1297 queue_work(ipoib_workqueue, &priv->cm.mb_task); 1298} 1299 1300static void ipoib_cm_rx_reap(struct work_struct *work) 1301{ 1302 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1303 cm.rx_reap_task)); 1304} 1305 1306static void ipoib_cm_stale_task(struct work_struct *work) 1307{ 1308 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1309 cm.stale_task.work); 1310 struct ipoib_cm_rx *p; 1311 int ret; 1312 1313 spin_lock_irq(&priv->lock); 1314 while (!list_empty(&priv->cm.passive_ids)) { 1315 /* List is sorted by LRU, start from tail, 1316 * stop when we see a recently used entry */ 1317 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1318 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1319 break; 1320 list_move(&p->list, &priv->cm.rx_error_list); 1321 p->state = IPOIB_CM_RX_ERROR; 1322 spin_unlock_irq(&priv->lock); 1323 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1324 if (ret) 1325 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1326 spin_lock_irq(&priv->lock); 1327 } 1328 1329 if (!list_empty(&priv->cm.passive_ids)) 1330 queue_delayed_work(ipoib_workqueue, 1331 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1332 spin_unlock_irq(&priv->lock); 1333} 1334 1335 1336static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge) 1337{ 1338 struct ib_srq_init_attr srq_init_attr = { 1339 .attr = { 1340 .max_wr = ipoib_recvq_size, 1341 .max_sge = max_sge 1342 } 1343 }; 1344 1345 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1346 if (IS_ERR(priv->cm.srq)) { 1347 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1348 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1349 priv->ca->name, PTR_ERR(priv->cm.srq)); 1350 priv->cm.srq = NULL; 1351 return; 1352 } 1353 1354 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL); 1355 if (!priv->cm.srq_ring) { 1356 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1357 priv->ca->name, ipoib_recvq_size); 1358 ib_destroy_srq(priv->cm.srq); 1359 priv->cm.srq = NULL; 1360 return; 1361 } 1362 1363 memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1364} 1365 1366int ipoib_cm_dev_init(struct ipoib_dev_priv *priv) 1367{ 1368 struct ifnet *dev = priv->dev; 1369 int i; 1370 int max_srq_sge; 1371 1372 INIT_LIST_HEAD(&priv->cm.passive_ids); 1373 INIT_LIST_HEAD(&priv->cm.reap_list); 1374 INIT_LIST_HEAD(&priv->cm.start_list); 1375 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1376 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1377 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1378 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1379 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1380 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1381 INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap); 1382 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1383 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1384 1385 bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue)); 1386 mtx_init(&priv->cm.mb_queue.ifq_mtx, 1387 dev->if_xname, "if send queue", MTX_DEF); 1388 1389 max_srq_sge = priv->ca->attrs.max_srq_sge; 1390 1391 ipoib_dbg(priv, "max_srq_sge=%d\n", max_srq_sge); 1392 1393 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, max_srq_sge); 1394 ipoib_cm_create_srq(priv, max_srq_sge); 1395 if (ipoib_cm_has_srq(priv)) { 1396 priv->cm.max_cm_mtu = max_srq_sge * MJUMPAGESIZE; 1397 priv->cm.num_frags = max_srq_sge; 1398 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1399 priv->cm.max_cm_mtu, priv->cm.num_frags); 1400 } else { 1401 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU; 1402 priv->cm.num_frags = IPOIB_CM_RX_SG; 1403 } 1404 1405 ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge); 1406 1407 if (ipoib_cm_has_srq(priv)) { 1408 for (i = 0; i < ipoib_recvq_size; ++i) { 1409 if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) { 1410 ipoib_warn(priv, "failed to allocate " 1411 "receive buffer %d\n", i); 1412 ipoib_cm_dev_cleanup(priv); 1413 return -ENOMEM; 1414 } 1415 1416 if (ipoib_cm_post_receive_srq(priv, i)) { 1417 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1418 "failed for buf %d\n", i); 1419 ipoib_cm_dev_cleanup(priv); 1420 return -EIO; 1421 } 1422 } 1423 } 1424 1425 IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC; 1426 return 0; 1427} 1428 1429void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv) 1430{ 1431 int ret; 1432 1433 if (!priv->cm.srq) 1434 return; 1435 1436 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1437 1438 ret = ib_destroy_srq(priv->cm.srq); 1439 if (ret) 1440 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1441 1442 priv->cm.srq = NULL; 1443 if (!priv->cm.srq_ring) 1444 return; 1445 1446 ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring); 1447 priv->cm.srq_ring = NULL; 1448 1449 mtx_destroy(&priv->cm.mb_queue.ifq_mtx); 1450} 1451 1452#endif /* CONFIG_INFINIBAND_IPOIB_CM */ 1453