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 * $Id$ 33 */ 34 35 #include <rdma/ib_cm.h> 36 #include <rdma/ib_cache.h> 37 #include <net/dst.h> 38 #include <net/icmp.h> 39 #include <linux/icmpv6.h> 40 #include <linux/delay.h> 41 #include <linux/vmalloc.h> 42 43 #include "ipoib.h" 44 45 int ipoib_max_conn_qp = 128; 46 47 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 48 MODULE_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 53 static int data_debug_level; 54 55 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 56 MODULE_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 67 static 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 73 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 74 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 75 .opcode = IB_WR_SEND, 76 }; 77 78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 79 struct ib_cm_event *event); 80 81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 82 u64 mapping[IPOIB_CM_RX_SG]) 83 { 84 int i; 85 86 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 87 88 for (i = 0; i < frags; ++i) 89 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 90 } 91 92 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 93 { 94 struct ipoib_dev_priv *priv = netdev_priv(dev); 95 struct ib_recv_wr *bad_wr; 96 int i, ret; 97 98 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 99 100 for (i = 0; i < priv->cm.num_frags; ++i) 101 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 102 103 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 104 if (unlikely(ret)) { 105 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 106 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 107 priv->cm.srq_ring[id].mapping); 108 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 109 priv->cm.srq_ring[id].skb = NULL; 110 } 111 112 return ret; 113 } 114 115 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 116 struct ipoib_cm_rx *rx, int id) 117 { 118 struct ipoib_dev_priv *priv = netdev_priv(dev); 119 struct ib_recv_wr *bad_wr; 120 int i, ret; 121 122 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 123 124 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 125 priv->cm.rx_sge[i].addr = rx->rx_ring[id].mapping[i]; 126 127 ret = ib_post_recv(rx->qp, &priv->cm.rx_wr, &bad_wr); 128 if (unlikely(ret)) { 129 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 130 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 131 rx->rx_ring[id].mapping); 132 dev_kfree_skb_any(rx->rx_ring[id].skb); 133 rx->rx_ring[id].skb = NULL; 134 } 135 136 return ret; 137 } 138 139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 140 struct ipoib_cm_rx_buf *rx_ring, 141 int id, int frags, 142 u64 mapping[IPOIB_CM_RX_SG]) 143 { 144 struct ipoib_dev_priv *priv = netdev_priv(dev); 145 struct sk_buff *skb; 146 int i; 147 148 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 149 if (unlikely(!skb)) 150 return NULL; 151 152 /* 153 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 154 * IP header to a multiple of 16. 155 */ 156 skb_reserve(skb, 12); 157 158 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 159 DMA_FROM_DEVICE); 160 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 161 dev_kfree_skb_any(skb); 162 return NULL; 163 } 164 165 for (i = 0; i < frags; i++) { 166 struct page *page = alloc_page(GFP_ATOMIC); 167 168 if (!page) 169 goto partial_error; 170 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 171 172 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page, 173 0, PAGE_SIZE, DMA_FROM_DEVICE); 174 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 175 goto partial_error; 176 } 177 178 rx_ring[id].skb = skb; 179 return skb; 180 181 partial_error: 182 183 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 184 185 for (; i > 0; --i) 186 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 187 188 dev_kfree_skb_any(skb); 189 return NULL; 190 } 191 192 static void ipoib_cm_free_rx_ring(struct net_device *dev, 193 struct ipoib_cm_rx_buf *rx_ring) 194 { 195 struct ipoib_dev_priv *priv = netdev_priv(dev); 196 int i; 197 198 for (i = 0; i < ipoib_recvq_size; ++i) 199 if (rx_ring[i].skb) { 200 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 201 rx_ring[i].mapping); 202 dev_kfree_skb_any(rx_ring[i].skb); 203 } 204 205 kfree(rx_ring); 206 } 207 208 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 209 { 210 struct ib_send_wr *bad_wr; 211 struct ipoib_cm_rx *p; 212 213 /* We only reserved 1 extra slot in CQ for drain WRs, so 214 * make sure we have at most 1 outstanding WR. */ 215 if (list_empty(&priv->cm.rx_flush_list) || 216 !list_empty(&priv->cm.rx_drain_list)) 217 return; 218 219 /* 220 * QPs on flush list are error state. This way, a "flush 221 * error" WC will be immediately generated for each WR we post. 222 */ 223 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 224 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 225 ipoib_warn(priv, "failed to post drain wr\n"); 226 227 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 228 } 229 230 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 231 { 232 struct ipoib_cm_rx *p = ctx; 233 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 234 unsigned long flags; 235 236 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 237 return; 238 239 spin_lock_irqsave(&priv->lock, flags); 240 list_move(&p->list, &priv->cm.rx_flush_list); 241 p->state = IPOIB_CM_RX_FLUSH; 242 ipoib_cm_start_rx_drain(priv); 243 spin_unlock_irqrestore(&priv->lock, flags); 244 } 245 246 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 247 struct ipoib_cm_rx *p) 248 { 249 struct ipoib_dev_priv *priv = netdev_priv(dev); 250 struct ib_qp_init_attr attr = { 251 .event_handler = ipoib_cm_rx_event_handler, 252 .send_cq = priv->cq, /* For drain WR */ 253 .recv_cq = priv->cq, 254 .srq = priv->cm.srq, 255 .cap.max_send_wr = 1, /* For drain WR */ 256 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 257 .sq_sig_type = IB_SIGNAL_ALL_WR, 258 .qp_type = IB_QPT_RC, 259 .qp_context = p, 260 }; 261 262 if (!ipoib_cm_has_srq(dev)) { 263 attr.cap.max_recv_wr = ipoib_recvq_size; 264 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 265 } 266 267 return ib_create_qp(priv->pd, &attr); 268 } 269 270 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 271 struct ib_cm_id *cm_id, struct ib_qp *qp, 272 unsigned psn) 273 { 274 struct ipoib_dev_priv *priv = netdev_priv(dev); 275 struct ib_qp_attr qp_attr; 276 int qp_attr_mask, ret; 277 278 qp_attr.qp_state = IB_QPS_INIT; 279 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 280 if (ret) { 281 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 282 return ret; 283 } 284 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 285 if (ret) { 286 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 287 return ret; 288 } 289 qp_attr.qp_state = IB_QPS_RTR; 290 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 291 if (ret) { 292 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 293 return ret; 294 } 295 qp_attr.rq_psn = psn; 296 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 297 if (ret) { 298 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 299 return ret; 300 } 301 302 /* 303 * Current Mellanox HCA firmware won't generate completions 304 * with error for drain WRs unless the QP has been moved to 305 * RTS first. This work-around leaves a window where a QP has 306 * moved to error asynchronously, but this will eventually get 307 * fixed in firmware, so let's not error out if modify QP 308 * fails. 309 */ 310 qp_attr.qp_state = IB_QPS_RTS; 311 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 312 if (ret) { 313 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 314 return 0; 315 } 316 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 317 if (ret) { 318 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 319 return 0; 320 } 321 322 return 0; 323 } 324 325 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 326 struct ipoib_cm_rx *rx) 327 { 328 struct ipoib_dev_priv *priv = netdev_priv(dev); 329 int ret; 330 int i; 331 332 rx->rx_ring = kcalloc(ipoib_recvq_size, sizeof *rx->rx_ring, GFP_KERNEL); 333 if (!rx->rx_ring) 334 return -ENOMEM; 335 336 spin_lock_irq(&priv->lock); 337 338 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 339 spin_unlock_irq(&priv->lock); 340 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 341 ret = -EINVAL; 342 goto err_free; 343 } else 344 ++priv->cm.nonsrq_conn_qp; 345 346 spin_unlock_irq(&priv->lock); 347 348 for (i = 0; i < ipoib_recvq_size; ++i) { 349 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 350 rx->rx_ring[i].mapping)) { 351 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 352 ret = -ENOMEM; 353 goto err_count; 354 } 355 ret = ipoib_cm_post_receive_nonsrq(dev, rx, i); 356 if (ret) { 357 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 358 "failed for buf %d\n", i); 359 ret = -EIO; 360 goto err_count; 361 } 362 } 363 364 rx->recv_count = ipoib_recvq_size; 365 366 return 0; 367 368 err_count: 369 spin_lock_irq(&priv->lock); 370 --priv->cm.nonsrq_conn_qp; 371 spin_unlock_irq(&priv->lock); 372 373 err_free: 374 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 375 376 return ret; 377 } 378 379 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 380 struct ib_qp *qp, struct ib_cm_req_event_param *req, 381 unsigned psn) 382 { 383 struct ipoib_dev_priv *priv = netdev_priv(dev); 384 struct ipoib_cm_data data = {}; 385 struct ib_cm_rep_param rep = {}; 386 387 data.qpn = cpu_to_be32(priv->qp->qp_num); 388 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 389 390 rep.private_data = &data; 391 rep.private_data_len = sizeof data; 392 rep.flow_control = 0; 393 rep.rnr_retry_count = req->rnr_retry_count; 394 rep.srq = ipoib_cm_has_srq(dev); 395 rep.qp_num = qp->qp_num; 396 rep.starting_psn = psn; 397 return ib_send_cm_rep(cm_id, &rep); 398 } 399 400 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 401 { 402 struct net_device *dev = cm_id->context; 403 struct ipoib_dev_priv *priv = netdev_priv(dev); 404 struct ipoib_cm_rx *p; 405 unsigned psn; 406 int ret; 407 408 ipoib_dbg(priv, "REQ arrived\n"); 409 p = kzalloc(sizeof *p, GFP_KERNEL); 410 if (!p) 411 return -ENOMEM; 412 p->dev = dev; 413 p->id = cm_id; 414 cm_id->context = p; 415 p->state = IPOIB_CM_RX_LIVE; 416 p->jiffies = jiffies; 417 INIT_LIST_HEAD(&p->list); 418 419 p->qp = ipoib_cm_create_rx_qp(dev, p); 420 if (IS_ERR(p->qp)) { 421 ret = PTR_ERR(p->qp); 422 goto err_qp; 423 } 424 425 psn = random32() & 0xffffff; 426 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 427 if (ret) 428 goto err_modify; 429 430 if (!ipoib_cm_has_srq(dev)) { 431 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 432 if (ret) 433 goto err_modify; 434 } 435 436 spin_lock_irq(&priv->lock); 437 queue_delayed_work(ipoib_workqueue, 438 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 439 /* Add this entry to passive ids list head, but do not re-add it 440 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 441 p->jiffies = jiffies; 442 if (p->state == IPOIB_CM_RX_LIVE) 443 list_move(&p->list, &priv->cm.passive_ids); 444 spin_unlock_irq(&priv->lock); 445 446 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 447 if (ret) { 448 ipoib_warn(priv, "failed to send REP: %d\n", ret); 449 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 450 ipoib_warn(priv, "unable to move qp to error state\n"); 451 } 452 return 0; 453 454 err_modify: 455 ib_destroy_qp(p->qp); 456 err_qp: 457 kfree(p); 458 return ret; 459 } 460 461 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 462 struct ib_cm_event *event) 463 { 464 struct ipoib_cm_rx *p; 465 struct ipoib_dev_priv *priv; 466 467 switch (event->event) { 468 case IB_CM_REQ_RECEIVED: 469 return ipoib_cm_req_handler(cm_id, event); 470 case IB_CM_DREQ_RECEIVED: 471 p = cm_id->context; 472 ib_send_cm_drep(cm_id, NULL, 0); 473 /* Fall through */ 474 case IB_CM_REJ_RECEIVED: 475 p = cm_id->context; 476 priv = netdev_priv(p->dev); 477 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 478 ipoib_warn(priv, "unable to move qp to error state\n"); 479 /* Fall through */ 480 default: 481 return 0; 482 } 483 } 484 /* Adjust length of skb with fragments to match received data */ 485 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 486 unsigned int length, struct sk_buff *toskb) 487 { 488 int i, num_frags; 489 unsigned int size; 490 491 /* put header into skb */ 492 size = min(length, hdr_space); 493 skb->tail += size; 494 skb->len += size; 495 length -= size; 496 497 num_frags = skb_shinfo(skb)->nr_frags; 498 for (i = 0; i < num_frags; i++) { 499 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 500 501 if (length == 0) { 502 /* don't need this page */ 503 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE); 504 --skb_shinfo(skb)->nr_frags; 505 } else { 506 size = min(length, (unsigned) PAGE_SIZE); 507 508 frag->size = size; 509 skb->data_len += size; 510 skb->truesize += size; 511 skb->len += size; 512 length -= size; 513 } 514 } 515 } 516 517 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 518 { 519 struct ipoib_dev_priv *priv = netdev_priv(dev); 520 struct ipoib_cm_rx_buf *rx_ring; 521 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 522 struct sk_buff *skb, *newskb; 523 struct ipoib_cm_rx *p; 524 unsigned long flags; 525 u64 mapping[IPOIB_CM_RX_SG]; 526 int frags; 527 int has_srq; 528 529 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 530 wr_id, wc->status); 531 532 if (unlikely(wr_id >= ipoib_recvq_size)) { 533 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 534 spin_lock_irqsave(&priv->lock, flags); 535 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 536 ipoib_cm_start_rx_drain(priv); 537 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 538 spin_unlock_irqrestore(&priv->lock, flags); 539 } else 540 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 541 wr_id, ipoib_recvq_size); 542 return; 543 } 544 545 p = wc->qp->qp_context; 546 547 has_srq = ipoib_cm_has_srq(dev); 548 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 549 550 skb = rx_ring[wr_id].skb; 551 552 if (unlikely(wc->status != IB_WC_SUCCESS)) { 553 ipoib_dbg(priv, "cm recv error " 554 "(status=%d, wrid=%d vend_err %x)\n", 555 wc->status, wr_id, wc->vendor_err); 556 ++dev->stats.rx_dropped; 557 if (has_srq) 558 goto repost; 559 else { 560 if (!--p->recv_count) { 561 spin_lock_irqsave(&priv->lock, flags); 562 list_move(&p->list, &priv->cm.rx_reap_list); 563 spin_unlock_irqrestore(&priv->lock, flags); 564 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 565 } 566 return; 567 } 568 } 569 570 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 571 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 572 spin_lock_irqsave(&priv->lock, flags); 573 p->jiffies = jiffies; 574 /* Move this entry to list head, but do not re-add it 575 * if it has been moved out of list. */ 576 if (p->state == IPOIB_CM_RX_LIVE) 577 list_move(&p->list, &priv->cm.passive_ids); 578 spin_unlock_irqrestore(&priv->lock, flags); 579 } 580 } 581 582 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 583 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 584 585 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping); 586 if (unlikely(!newskb)) { 587 /* 588 * If we can't allocate a new RX buffer, dump 589 * this packet and reuse the old buffer. 590 */ 591 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 592 ++dev->stats.rx_dropped; 593 goto repost; 594 } 595 596 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 597 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 598 599 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 600 wc->byte_len, wc->slid); 601 602 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 603 604 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 605 skb_reset_mac_header(skb); 606 skb_pull(skb, IPOIB_ENCAP_LEN); 607 608 dev->last_rx = jiffies; 609 ++dev->stats.rx_packets; 610 dev->stats.rx_bytes += skb->len; 611 612 skb->dev = dev; 613 /* XXX get correct PACKET_ type here */ 614 skb->pkt_type = PACKET_HOST; 615 netif_receive_skb(skb); 616 617 repost: 618 if (has_srq) { 619 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 620 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 621 "for buf %d\n", wr_id); 622 } else { 623 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, wr_id))) { 624 --p->recv_count; 625 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 626 "for buf %d\n", wr_id); 627 } 628 } 629 } 630 631 static inline int post_send(struct ipoib_dev_priv *priv, 632 struct ipoib_cm_tx *tx, 633 unsigned int wr_id, 634 u64 addr, int len) 635 { 636 struct ib_send_wr *bad_wr; 637 638 priv->tx_sge[0].addr = addr; 639 priv->tx_sge[0].length = len; 640 641 priv->tx_wr.num_sge = 1; 642 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 643 644 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 645 } 646 647 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 648 { 649 struct ipoib_dev_priv *priv = netdev_priv(dev); 650 struct ipoib_tx_buf *tx_req; 651 u64 addr; 652 653 if (unlikely(skb->len > tx->mtu)) { 654 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 655 skb->len, tx->mtu); 656 ++dev->stats.tx_dropped; 657 ++dev->stats.tx_errors; 658 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 659 return; 660 } 661 662 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 663 tx->tx_head, skb->len, tx->qp->qp_num); 664 665 /* 666 * We put the skb into the tx_ring _before_ we call post_send() 667 * because it's entirely possible that the completion handler will 668 * run before we execute anything after the post_send(). That 669 * means we have to make sure everything is properly recorded and 670 * our state is consistent before we call post_send(). 671 */ 672 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 673 tx_req->skb = skb; 674 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 675 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 676 ++dev->stats.tx_errors; 677 dev_kfree_skb_any(skb); 678 return; 679 } 680 681 tx_req->mapping[0] = addr; 682 683 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 684 addr, skb->len))) { 685 ipoib_warn(priv, "post_send failed\n"); 686 ++dev->stats.tx_errors; 687 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 688 dev_kfree_skb_any(skb); 689 } else { 690 dev->trans_start = jiffies; 691 ++tx->tx_head; 692 693 if (++priv->tx_outstanding == ipoib_sendq_size) { 694 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 695 tx->qp->qp_num); 696 netif_stop_queue(dev); 697 } 698 } 699 } 700 701 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 702 { 703 struct ipoib_dev_priv *priv = netdev_priv(dev); 704 struct ipoib_cm_tx *tx = wc->qp->qp_context; 705 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 706 struct ipoib_tx_buf *tx_req; 707 unsigned long flags; 708 709 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 710 wr_id, wc->status); 711 712 if (unlikely(wr_id >= ipoib_sendq_size)) { 713 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 714 wr_id, ipoib_sendq_size); 715 return; 716 } 717 718 tx_req = &tx->tx_ring[wr_id]; 719 720 ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len, DMA_TO_DEVICE); 721 722 /* FIXME: is this right? Shouldn't we only increment on success? */ 723 ++dev->stats.tx_packets; 724 dev->stats.tx_bytes += tx_req->skb->len; 725 726 dev_kfree_skb_any(tx_req->skb); 727 728 spin_lock_irqsave(&priv->tx_lock, flags); 729 ++tx->tx_tail; 730 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 731 netif_queue_stopped(dev) && 732 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 733 netif_wake_queue(dev); 734 735 if (wc->status != IB_WC_SUCCESS && 736 wc->status != IB_WC_WR_FLUSH_ERR) { 737 struct ipoib_neigh *neigh; 738 739 ipoib_dbg(priv, "failed cm send event " 740 "(status=%d, wrid=%d vend_err %x)\n", 741 wc->status, wr_id, wc->vendor_err); 742 743 spin_lock(&priv->lock); 744 neigh = tx->neigh; 745 746 if (neigh) { 747 neigh->cm = NULL; 748 list_del(&neigh->list); 749 if (neigh->ah) 750 ipoib_put_ah(neigh->ah); 751 ipoib_neigh_free(dev, neigh); 752 753 tx->neigh = NULL; 754 } 755 756 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 757 list_move(&tx->list, &priv->cm.reap_list); 758 queue_work(ipoib_workqueue, &priv->cm.reap_task); 759 } 760 761 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 762 763 spin_unlock(&priv->lock); 764 } 765 766 spin_unlock_irqrestore(&priv->tx_lock, flags); 767 } 768 769 int ipoib_cm_dev_open(struct net_device *dev) 770 { 771 struct ipoib_dev_priv *priv = netdev_priv(dev); 772 int ret; 773 774 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 775 return 0; 776 777 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 778 if (IS_ERR(priv->cm.id)) { 779 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 780 ret = PTR_ERR(priv->cm.id); 781 goto err_cm; 782 } 783 784 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 785 0, NULL); 786 if (ret) { 787 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 788 IPOIB_CM_IETF_ID | priv->qp->qp_num); 789 goto err_listen; 790 } 791 792 return 0; 793 794 err_listen: 795 ib_destroy_cm_id(priv->cm.id); 796 err_cm: 797 priv->cm.id = NULL; 798 return ret; 799 } 800 801 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 802 { 803 struct ipoib_dev_priv *priv = netdev_priv(dev); 804 struct ipoib_cm_rx *rx, *n; 805 LIST_HEAD(list); 806 807 spin_lock_irq(&priv->lock); 808 list_splice_init(&priv->cm.rx_reap_list, &list); 809 spin_unlock_irq(&priv->lock); 810 811 list_for_each_entry_safe(rx, n, &list, list) { 812 ib_destroy_cm_id(rx->id); 813 ib_destroy_qp(rx->qp); 814 if (!ipoib_cm_has_srq(dev)) { 815 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 816 spin_lock_irq(&priv->lock); 817 --priv->cm.nonsrq_conn_qp; 818 spin_unlock_irq(&priv->lock); 819 } 820 kfree(rx); 821 } 822 } 823 824 void ipoib_cm_dev_stop(struct net_device *dev) 825 { 826 struct ipoib_dev_priv *priv = netdev_priv(dev); 827 struct ipoib_cm_rx *p; 828 unsigned long begin; 829 int ret; 830 831 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 832 return; 833 834 ib_destroy_cm_id(priv->cm.id); 835 priv->cm.id = NULL; 836 837 spin_lock_irq(&priv->lock); 838 while (!list_empty(&priv->cm.passive_ids)) { 839 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 840 list_move(&p->list, &priv->cm.rx_error_list); 841 p->state = IPOIB_CM_RX_ERROR; 842 spin_unlock_irq(&priv->lock); 843 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 844 if (ret) 845 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 846 spin_lock_irq(&priv->lock); 847 } 848 849 /* Wait for all RX to be drained */ 850 begin = jiffies; 851 852 while (!list_empty(&priv->cm.rx_error_list) || 853 !list_empty(&priv->cm.rx_flush_list) || 854 !list_empty(&priv->cm.rx_drain_list)) { 855 if (time_after(jiffies, begin + 5 * HZ)) { 856 ipoib_warn(priv, "RX drain timing out\n"); 857 858 /* 859 * assume the HW is wedged and just free up everything. 860 */ 861 list_splice_init(&priv->cm.rx_flush_list, 862 &priv->cm.rx_reap_list); 863 list_splice_init(&priv->cm.rx_error_list, 864 &priv->cm.rx_reap_list); 865 list_splice_init(&priv->cm.rx_drain_list, 866 &priv->cm.rx_reap_list); 867 break; 868 } 869 spin_unlock_irq(&priv->lock); 870 msleep(1); 871 ipoib_drain_cq(dev); 872 spin_lock_irq(&priv->lock); 873 } 874 875 spin_unlock_irq(&priv->lock); 876 877 ipoib_cm_free_rx_reap_list(dev); 878 879 cancel_delayed_work(&priv->cm.stale_task); 880 } 881 882 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 883 { 884 struct ipoib_cm_tx *p = cm_id->context; 885 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 886 struct ipoib_cm_data *data = event->private_data; 887 struct sk_buff_head skqueue; 888 struct ib_qp_attr qp_attr; 889 int qp_attr_mask, ret; 890 struct sk_buff *skb; 891 892 p->mtu = be32_to_cpu(data->mtu); 893 894 if (p->mtu <= IPOIB_ENCAP_LEN) { 895 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 896 p->mtu, IPOIB_ENCAP_LEN); 897 return -EINVAL; 898 } 899 900 qp_attr.qp_state = IB_QPS_RTR; 901 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 902 if (ret) { 903 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 904 return ret; 905 } 906 907 qp_attr.rq_psn = 0 /* FIXME */; 908 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 909 if (ret) { 910 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 911 return ret; 912 } 913 914 qp_attr.qp_state = IB_QPS_RTS; 915 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 916 if (ret) { 917 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 918 return ret; 919 } 920 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 921 if (ret) { 922 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 923 return ret; 924 } 925 926 skb_queue_head_init(&skqueue); 927 928 spin_lock_irq(&priv->lock); 929 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 930 if (p->neigh) 931 while ((skb = __skb_dequeue(&p->neigh->queue))) 932 __skb_queue_tail(&skqueue, skb); 933 spin_unlock_irq(&priv->lock); 934 935 while ((skb = __skb_dequeue(&skqueue))) { 936 skb->dev = p->dev; 937 if (dev_queue_xmit(skb)) 938 ipoib_warn(priv, "dev_queue_xmit failed " 939 "to requeue packet\n"); 940 } 941 942 ret = ib_send_cm_rtu(cm_id, NULL, 0); 943 if (ret) { 944 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 945 return ret; 946 } 947 return 0; 948 } 949 950 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 951 { 952 struct ipoib_dev_priv *priv = netdev_priv(dev); 953 struct ib_qp_init_attr attr = { 954 .send_cq = priv->cq, 955 .recv_cq = priv->cq, 956 .srq = priv->cm.srq, 957 .cap.max_send_wr = ipoib_sendq_size, 958 .cap.max_send_sge = 1, 959 .sq_sig_type = IB_SIGNAL_ALL_WR, 960 .qp_type = IB_QPT_RC, 961 .qp_context = tx 962 }; 963 964 return ib_create_qp(priv->pd, &attr); 965 } 966 967 static int ipoib_cm_send_req(struct net_device *dev, 968 struct ib_cm_id *id, struct ib_qp *qp, 969 u32 qpn, 970 struct ib_sa_path_rec *pathrec) 971 { 972 struct ipoib_dev_priv *priv = netdev_priv(dev); 973 struct ipoib_cm_data data = {}; 974 struct ib_cm_req_param req = {}; 975 976 data.qpn = cpu_to_be32(priv->qp->qp_num); 977 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 978 979 req.primary_path = pathrec; 980 req.alternate_path = NULL; 981 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 982 req.qp_num = qp->qp_num; 983 req.qp_type = qp->qp_type; 984 req.private_data = &data; 985 req.private_data_len = sizeof data; 986 req.flow_control = 0; 987 988 req.starting_psn = 0; /* FIXME */ 989 990 /* 991 * Pick some arbitrary defaults here; we could make these 992 * module parameters if anyone cared about setting them. 993 */ 994 req.responder_resources = 4; 995 req.remote_cm_response_timeout = 20; 996 req.local_cm_response_timeout = 20; 997 req.retry_count = 0; /* RFC draft warns against retries */ 998 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 999 req.max_cm_retries = 15; 1000 req.srq = ipoib_cm_has_srq(dev); 1001 return ib_send_cm_req(id, &req); 1002 } 1003 1004 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1005 struct ib_cm_id *cm_id, struct ib_qp *qp) 1006 { 1007 struct ipoib_dev_priv *priv = netdev_priv(dev); 1008 struct ib_qp_attr qp_attr; 1009 int qp_attr_mask, ret; 1010 ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1011 if (ret) { 1012 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret); 1013 return ret; 1014 } 1015 1016 qp_attr.qp_state = IB_QPS_INIT; 1017 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1018 qp_attr.port_num = priv->port; 1019 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1020 1021 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1022 if (ret) { 1023 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1024 return ret; 1025 } 1026 return 0; 1027 } 1028 1029 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1030 struct ib_sa_path_rec *pathrec) 1031 { 1032 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1033 int ret; 1034 1035 p->tx_ring = vmalloc(ipoib_sendq_size * sizeof *p->tx_ring); 1036 if (!p->tx_ring) { 1037 ipoib_warn(priv, "failed to allocate tx ring\n"); 1038 ret = -ENOMEM; 1039 goto err_tx; 1040 } 1041 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1042 1043 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1044 if (IS_ERR(p->qp)) { 1045 ret = PTR_ERR(p->qp); 1046 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1047 goto err_qp; 1048 } 1049 1050 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1051 if (IS_ERR(p->id)) { 1052 ret = PTR_ERR(p->id); 1053 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1054 goto err_id; 1055 } 1056 1057 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1058 if (ret) { 1059 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1060 goto err_modify; 1061 } 1062 1063 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1064 if (ret) { 1065 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1066 goto err_send_cm; 1067 } 1068 1069 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n", 1070 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn); 1071 1072 return 0; 1073 1074 err_send_cm: 1075 err_modify: 1076 ib_destroy_cm_id(p->id); 1077 err_id: 1078 p->id = NULL; 1079 ib_destroy_qp(p->qp); 1080 err_qp: 1081 p->qp = NULL; 1082 vfree(p->tx_ring); 1083 err_tx: 1084 return ret; 1085 } 1086 1087 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1088 { 1089 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1090 struct ipoib_tx_buf *tx_req; 1091 unsigned long flags; 1092 unsigned long begin; 1093 1094 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1095 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1096 1097 if (p->id) 1098 ib_destroy_cm_id(p->id); 1099 1100 if (p->tx_ring) { 1101 /* Wait for all sends to complete */ 1102 begin = jiffies; 1103 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1104 if (time_after(jiffies, begin + 5 * HZ)) { 1105 ipoib_warn(priv, "timing out; %d sends not completed\n", 1106 p->tx_head - p->tx_tail); 1107 goto timeout; 1108 } 1109 1110 msleep(1); 1111 } 1112 } 1113 1114 timeout: 1115 1116 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1117 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1118 ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len, 1119 DMA_TO_DEVICE); 1120 dev_kfree_skb_any(tx_req->skb); 1121 ++p->tx_tail; 1122 spin_lock_irqsave(&priv->tx_lock, flags); 1123 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1124 netif_queue_stopped(p->dev) && 1125 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1126 netif_wake_queue(p->dev); 1127 spin_unlock_irqrestore(&priv->tx_lock, flags); 1128 } 1129 1130 if (p->qp) 1131 ib_destroy_qp(p->qp); 1132 1133 vfree(p->tx_ring); 1134 kfree(p); 1135 } 1136 1137 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1138 struct ib_cm_event *event) 1139 { 1140 struct ipoib_cm_tx *tx = cm_id->context; 1141 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1142 struct net_device *dev = priv->dev; 1143 struct ipoib_neigh *neigh; 1144 int ret; 1145 1146 switch (event->event) { 1147 case IB_CM_DREQ_RECEIVED: 1148 ipoib_dbg(priv, "DREQ received.\n"); 1149 ib_send_cm_drep(cm_id, NULL, 0); 1150 break; 1151 case IB_CM_REP_RECEIVED: 1152 ipoib_dbg(priv, "REP received.\n"); 1153 ret = ipoib_cm_rep_handler(cm_id, event); 1154 if (ret) 1155 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1156 NULL, 0, NULL, 0); 1157 break; 1158 case IB_CM_REQ_ERROR: 1159 case IB_CM_REJ_RECEIVED: 1160 case IB_CM_TIMEWAIT_EXIT: 1161 ipoib_dbg(priv, "CM error %d.\n", event->event); 1162 spin_lock_irq(&priv->tx_lock); 1163 spin_lock(&priv->lock); 1164 neigh = tx->neigh; 1165 1166 if (neigh) { 1167 neigh->cm = NULL; 1168 list_del(&neigh->list); 1169 if (neigh->ah) 1170 ipoib_put_ah(neigh->ah); 1171 ipoib_neigh_free(dev, neigh); 1172 1173 tx->neigh = NULL; 1174 } 1175 1176 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1177 list_move(&tx->list, &priv->cm.reap_list); 1178 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1179 } 1180 1181 spin_unlock(&priv->lock); 1182 spin_unlock_irq(&priv->tx_lock); 1183 break; 1184 default: 1185 break; 1186 } 1187 1188 return 0; 1189 } 1190 1191 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1192 struct ipoib_neigh *neigh) 1193 { 1194 struct ipoib_dev_priv *priv = netdev_priv(dev); 1195 struct ipoib_cm_tx *tx; 1196 1197 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1198 if (!tx) 1199 return NULL; 1200 1201 neigh->cm = tx; 1202 tx->neigh = neigh; 1203 tx->path = path; 1204 tx->dev = dev; 1205 list_add(&tx->list, &priv->cm.start_list); 1206 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1207 queue_work(ipoib_workqueue, &priv->cm.start_task); 1208 return tx; 1209 } 1210 1211 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1212 { 1213 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1214 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1215 list_move(&tx->list, &priv->cm.reap_list); 1216 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1217 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n", 1218 IPOIB_GID_ARG(tx->neigh->dgid)); 1219 tx->neigh = NULL; 1220 } 1221 } 1222 1223 static void ipoib_cm_tx_start(struct work_struct *work) 1224 { 1225 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1226 cm.start_task); 1227 struct net_device *dev = priv->dev; 1228 struct ipoib_neigh *neigh; 1229 struct ipoib_cm_tx *p; 1230 unsigned long flags; 1231 int ret; 1232 1233 struct ib_sa_path_rec pathrec; 1234 u32 qpn; 1235 1236 spin_lock_irqsave(&priv->tx_lock, flags); 1237 spin_lock(&priv->lock); 1238 while (!list_empty(&priv->cm.start_list)) { 1239 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1240 list_del_init(&p->list); 1241 neigh = p->neigh; 1242 qpn = IPOIB_QPN(neigh->neighbour->ha); 1243 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1244 spin_unlock(&priv->lock); 1245 spin_unlock_irqrestore(&priv->tx_lock, flags); 1246 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1247 spin_lock_irqsave(&priv->tx_lock, flags); 1248 spin_lock(&priv->lock); 1249 if (ret) { 1250 neigh = p->neigh; 1251 if (neigh) { 1252 neigh->cm = NULL; 1253 list_del(&neigh->list); 1254 if (neigh->ah) 1255 ipoib_put_ah(neigh->ah); 1256 ipoib_neigh_free(dev, neigh); 1257 } 1258 list_del(&p->list); 1259 kfree(p); 1260 } 1261 } 1262 spin_unlock(&priv->lock); 1263 spin_unlock_irqrestore(&priv->tx_lock, flags); 1264 } 1265 1266 static void ipoib_cm_tx_reap(struct work_struct *work) 1267 { 1268 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1269 cm.reap_task); 1270 struct ipoib_cm_tx *p; 1271 1272 spin_lock_irq(&priv->tx_lock); 1273 spin_lock(&priv->lock); 1274 while (!list_empty(&priv->cm.reap_list)) { 1275 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1276 list_del(&p->list); 1277 spin_unlock(&priv->lock); 1278 spin_unlock_irq(&priv->tx_lock); 1279 ipoib_cm_tx_destroy(p); 1280 spin_lock_irq(&priv->tx_lock); 1281 spin_lock(&priv->lock); 1282 } 1283 spin_unlock(&priv->lock); 1284 spin_unlock_irq(&priv->tx_lock); 1285 } 1286 1287 static void ipoib_cm_skb_reap(struct work_struct *work) 1288 { 1289 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1290 cm.skb_task); 1291 struct sk_buff *skb; 1292 1293 unsigned mtu = priv->mcast_mtu; 1294 1295 spin_lock_irq(&priv->tx_lock); 1296 spin_lock(&priv->lock); 1297 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1298 spin_unlock(&priv->lock); 1299 spin_unlock_irq(&priv->tx_lock); 1300 if (skb->protocol == htons(ETH_P_IP)) 1301 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1302 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1303 else if (skb->protocol == htons(ETH_P_IPV6)) 1304 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev); 1305 #endif 1306 dev_kfree_skb_any(skb); 1307 spin_lock_irq(&priv->tx_lock); 1308 spin_lock(&priv->lock); 1309 } 1310 spin_unlock(&priv->lock); 1311 spin_unlock_irq(&priv->tx_lock); 1312 } 1313 1314 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1315 unsigned int mtu) 1316 { 1317 struct ipoib_dev_priv *priv = netdev_priv(dev); 1318 int e = skb_queue_empty(&priv->cm.skb_queue); 1319 1320 if (skb->dst) 1321 skb->dst->ops->update_pmtu(skb->dst, mtu); 1322 1323 skb_queue_tail(&priv->cm.skb_queue, skb); 1324 if (e) 1325 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1326 } 1327 1328 static void ipoib_cm_rx_reap(struct work_struct *work) 1329 { 1330 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1331 cm.rx_reap_task)->dev); 1332 } 1333 1334 static void ipoib_cm_stale_task(struct work_struct *work) 1335 { 1336 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1337 cm.stale_task.work); 1338 struct ipoib_cm_rx *p; 1339 int ret; 1340 1341 spin_lock_irq(&priv->lock); 1342 while (!list_empty(&priv->cm.passive_ids)) { 1343 /* List is sorted by LRU, start from tail, 1344 * stop when we see a recently used entry */ 1345 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1346 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1347 break; 1348 list_move(&p->list, &priv->cm.rx_error_list); 1349 p->state = IPOIB_CM_RX_ERROR; 1350 spin_unlock_irq(&priv->lock); 1351 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1352 if (ret) 1353 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1354 spin_lock_irq(&priv->lock); 1355 } 1356 1357 if (!list_empty(&priv->cm.passive_ids)) 1358 queue_delayed_work(ipoib_workqueue, 1359 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1360 spin_unlock_irq(&priv->lock); 1361 } 1362 1363 1364 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1365 char *buf) 1366 { 1367 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1368 1369 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1370 return sprintf(buf, "connected\n"); 1371 else 1372 return sprintf(buf, "datagram\n"); 1373 } 1374 1375 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1376 const char *buf, size_t count) 1377 { 1378 struct net_device *dev = to_net_dev(d); 1379 struct ipoib_dev_priv *priv = netdev_priv(dev); 1380 1381 /* flush paths if we switch modes so that connections are restarted */ 1382 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 1383 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1384 ipoib_warn(priv, "enabling connected mode " 1385 "will cause multicast packet drops\n"); 1386 ipoib_flush_paths(dev); 1387 return count; 1388 } 1389 1390 if (!strcmp(buf, "datagram\n")) { 1391 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1392 dev->mtu = min(priv->mcast_mtu, dev->mtu); 1393 ipoib_flush_paths(dev); 1394 return count; 1395 } 1396 1397 return -EINVAL; 1398 } 1399 1400 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1401 1402 int ipoib_cm_add_mode_attr(struct net_device *dev) 1403 { 1404 return device_create_file(&dev->dev, &dev_attr_mode); 1405 } 1406 1407 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1408 { 1409 struct ipoib_dev_priv *priv = netdev_priv(dev); 1410 struct ib_srq_init_attr srq_init_attr = { 1411 .attr = { 1412 .max_wr = ipoib_recvq_size, 1413 .max_sge = max_sge 1414 } 1415 }; 1416 1417 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1418 if (IS_ERR(priv->cm.srq)) { 1419 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1420 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1421 priv->ca->name, PTR_ERR(priv->cm.srq)); 1422 priv->cm.srq = NULL; 1423 return; 1424 } 1425 1426 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, 1427 GFP_KERNEL); 1428 if (!priv->cm.srq_ring) { 1429 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1430 priv->ca->name, ipoib_recvq_size); 1431 ib_destroy_srq(priv->cm.srq); 1432 priv->cm.srq = NULL; 1433 } 1434 } 1435 1436 int ipoib_cm_dev_init(struct net_device *dev) 1437 { 1438 struct ipoib_dev_priv *priv = netdev_priv(dev); 1439 int i, ret; 1440 struct ib_device_attr attr; 1441 1442 INIT_LIST_HEAD(&priv->cm.passive_ids); 1443 INIT_LIST_HEAD(&priv->cm.reap_list); 1444 INIT_LIST_HEAD(&priv->cm.start_list); 1445 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1446 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1447 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1448 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1449 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1450 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1451 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1452 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1453 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1454 1455 skb_queue_head_init(&priv->cm.skb_queue); 1456 1457 ret = ib_query_device(priv->ca, &attr); 1458 if (ret) { 1459 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1460 return ret; 1461 } 1462 1463 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1464 1465 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1466 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1467 if (ipoib_cm_has_srq(dev)) { 1468 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1469 priv->cm.num_frags = attr.max_srq_sge; 1470 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1471 priv->cm.max_cm_mtu, priv->cm.num_frags); 1472 } else { 1473 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1474 priv->cm.num_frags = IPOIB_CM_RX_SG; 1475 } 1476 1477 for (i = 0; i < priv->cm.num_frags; ++i) 1478 priv->cm.rx_sge[i].lkey = priv->mr->lkey; 1479 1480 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE; 1481 for (i = 1; i < priv->cm.num_frags; ++i) 1482 priv->cm.rx_sge[i].length = PAGE_SIZE; 1483 priv->cm.rx_wr.next = NULL; 1484 priv->cm.rx_wr.sg_list = priv->cm.rx_sge; 1485 priv->cm.rx_wr.num_sge = priv->cm.num_frags; 1486 1487 if (ipoib_cm_has_srq(dev)) { 1488 for (i = 0; i < ipoib_recvq_size; ++i) { 1489 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1490 priv->cm.num_frags - 1, 1491 priv->cm.srq_ring[i].mapping)) { 1492 ipoib_warn(priv, "failed to allocate " 1493 "receive buffer %d\n", i); 1494 ipoib_cm_dev_cleanup(dev); 1495 return -ENOMEM; 1496 } 1497 1498 if (ipoib_cm_post_receive_srq(dev, i)) { 1499 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1500 "failed for buf %d\n", i); 1501 ipoib_cm_dev_cleanup(dev); 1502 return -EIO; 1503 } 1504 } 1505 } 1506 1507 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1508 return 0; 1509 } 1510 1511 void ipoib_cm_dev_cleanup(struct net_device *dev) 1512 { 1513 struct ipoib_dev_priv *priv = netdev_priv(dev); 1514 int ret; 1515 1516 if (!priv->cm.srq) 1517 return; 1518 1519 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1520 1521 ret = ib_destroy_srq(priv->cm.srq); 1522 if (ret) 1523 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1524 1525 priv->cm.srq = NULL; 1526 if (!priv->cm.srq_ring) 1527 return; 1528 1529 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1530 priv->cm.srq_ring = NULL; 1531 } 1532