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 42 #include "ipoib.h" 43 44 int ipoib_max_conn_qp = 128; 45 46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 47 MODULE_PARM_DESC(max_nonsrq_conn_qp, 48 "Max number of connected-mode QPs per interface " 49 "(applied only if shared receive queue is not available)"); 50 51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 52 static int data_debug_level; 53 54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 55 MODULE_PARM_DESC(cm_data_debug_level, 56 "Enable data path debug tracing for connected mode if > 0"); 57 #endif 58 59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 60 61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 62 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 63 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 64 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 65 66 static struct ib_qp_attr ipoib_cm_err_attr = { 67 .qp_state = IB_QPS_ERR 68 }; 69 70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 71 72 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 73 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 74 .opcode = IB_WR_SEND, 75 }; 76 77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 78 struct ib_cm_event *event); 79 80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 81 u64 mapping[IPOIB_CM_RX_SG]) 82 { 83 int i; 84 85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 86 87 for (i = 0; i < frags; ++i) 88 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 89 } 90 91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 92 { 93 struct ipoib_dev_priv *priv = netdev_priv(dev); 94 struct ib_recv_wr *bad_wr; 95 int i, ret; 96 97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 98 99 for (i = 0; i < priv->cm.num_frags; ++i) 100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 101 102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 103 if (unlikely(ret)) { 104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 106 priv->cm.srq_ring[id].mapping); 107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 108 priv->cm.srq_ring[id].skb = NULL; 109 } 110 111 return ret; 112 } 113 114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 115 struct ipoib_cm_rx *rx, int id) 116 { 117 struct ipoib_dev_priv *priv = netdev_priv(dev); 118 struct ib_recv_wr *bad_wr; 119 int i, ret; 120 121 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 122 123 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 124 priv->cm.rx_sge[i].addr = rx->rx_ring[id].mapping[i]; 125 126 ret = ib_post_recv(rx->qp, &priv->cm.rx_wr, &bad_wr); 127 if (unlikely(ret)) { 128 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 129 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 130 rx->rx_ring[id].mapping); 131 dev_kfree_skb_any(rx->rx_ring[id].skb); 132 rx->rx_ring[id].skb = NULL; 133 } 134 135 return ret; 136 } 137 138 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 139 struct ipoib_cm_rx_buf *rx_ring, 140 int id, int frags, 141 u64 mapping[IPOIB_CM_RX_SG]) 142 { 143 struct ipoib_dev_priv *priv = netdev_priv(dev); 144 struct sk_buff *skb; 145 int i; 146 147 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 148 if (unlikely(!skb)) 149 return NULL; 150 151 /* 152 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 153 * IP header to a multiple of 16. 154 */ 155 skb_reserve(skb, 12); 156 157 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 158 DMA_FROM_DEVICE); 159 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 160 dev_kfree_skb_any(skb); 161 return NULL; 162 } 163 164 for (i = 0; i < frags; i++) { 165 struct page *page = alloc_page(GFP_ATOMIC); 166 167 if (!page) 168 goto partial_error; 169 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 170 171 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page, 172 0, PAGE_SIZE, DMA_FROM_DEVICE); 173 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 174 goto partial_error; 175 } 176 177 rx_ring[id].skb = skb; 178 return skb; 179 180 partial_error: 181 182 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 183 184 for (; i > 0; --i) 185 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 186 187 dev_kfree_skb_any(skb); 188 return NULL; 189 } 190 191 static void ipoib_cm_free_rx_ring(struct net_device *dev, 192 struct ipoib_cm_rx_buf *rx_ring) 193 { 194 struct ipoib_dev_priv *priv = netdev_priv(dev); 195 int i; 196 197 for (i = 0; i < ipoib_recvq_size; ++i) 198 if (rx_ring[i].skb) { 199 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 200 rx_ring[i].mapping); 201 dev_kfree_skb_any(rx_ring[i].skb); 202 } 203 204 kfree(rx_ring); 205 } 206 207 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 208 { 209 struct ib_send_wr *bad_wr; 210 struct ipoib_cm_rx *p; 211 212 /* We only reserved 1 extra slot in CQ for drain WRs, so 213 * make sure we have at most 1 outstanding WR. */ 214 if (list_empty(&priv->cm.rx_flush_list) || 215 !list_empty(&priv->cm.rx_drain_list)) 216 return; 217 218 /* 219 * QPs on flush list are error state. This way, a "flush 220 * error" WC will be immediately generated for each WR we post. 221 */ 222 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 223 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 224 ipoib_warn(priv, "failed to post drain wr\n"); 225 226 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 227 } 228 229 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 230 { 231 struct ipoib_cm_rx *p = ctx; 232 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 233 unsigned long flags; 234 235 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 236 return; 237 238 spin_lock_irqsave(&priv->lock, flags); 239 list_move(&p->list, &priv->cm.rx_flush_list); 240 p->state = IPOIB_CM_RX_FLUSH; 241 ipoib_cm_start_rx_drain(priv); 242 spin_unlock_irqrestore(&priv->lock, flags); 243 } 244 245 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 246 struct ipoib_cm_rx *p) 247 { 248 struct ipoib_dev_priv *priv = netdev_priv(dev); 249 struct ib_qp_init_attr attr = { 250 .event_handler = ipoib_cm_rx_event_handler, 251 .send_cq = priv->cq, /* For drain WR */ 252 .recv_cq = priv->cq, 253 .srq = priv->cm.srq, 254 .cap.max_send_wr = 1, /* For drain WR */ 255 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 256 .sq_sig_type = IB_SIGNAL_ALL_WR, 257 .qp_type = IB_QPT_RC, 258 .qp_context = p, 259 }; 260 261 if (!ipoib_cm_has_srq(dev)) { 262 attr.cap.max_recv_wr = ipoib_recvq_size; 263 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 264 } 265 266 return ib_create_qp(priv->pd, &attr); 267 } 268 269 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 270 struct ib_cm_id *cm_id, struct ib_qp *qp, 271 unsigned psn) 272 { 273 struct ipoib_dev_priv *priv = netdev_priv(dev); 274 struct ib_qp_attr qp_attr; 275 int qp_attr_mask, ret; 276 277 qp_attr.qp_state = IB_QPS_INIT; 278 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 279 if (ret) { 280 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 281 return ret; 282 } 283 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 284 if (ret) { 285 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 286 return ret; 287 } 288 qp_attr.qp_state = IB_QPS_RTR; 289 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 290 if (ret) { 291 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 292 return ret; 293 } 294 qp_attr.rq_psn = psn; 295 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 296 if (ret) { 297 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 298 return ret; 299 } 300 301 /* 302 * Current Mellanox HCA firmware won't generate completions 303 * with error for drain WRs unless the QP has been moved to 304 * RTS first. This work-around leaves a window where a QP has 305 * moved to error asynchronously, but this will eventually get 306 * fixed in firmware, so let's not error out if modify QP 307 * fails. 308 */ 309 qp_attr.qp_state = IB_QPS_RTS; 310 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 311 if (ret) { 312 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 313 return 0; 314 } 315 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 316 if (ret) { 317 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 318 return 0; 319 } 320 321 return 0; 322 } 323 324 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 325 struct ipoib_cm_rx *rx) 326 { 327 struct ipoib_dev_priv *priv = netdev_priv(dev); 328 int ret; 329 int i; 330 331 rx->rx_ring = kcalloc(ipoib_recvq_size, sizeof *rx->rx_ring, GFP_KERNEL); 332 if (!rx->rx_ring) 333 return -ENOMEM; 334 335 spin_lock_irq(&priv->lock); 336 337 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 338 spin_unlock_irq(&priv->lock); 339 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 340 ret = -EINVAL; 341 goto err_free; 342 } else 343 ++priv->cm.nonsrq_conn_qp; 344 345 spin_unlock_irq(&priv->lock); 346 347 for (i = 0; i < ipoib_recvq_size; ++i) { 348 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 349 rx->rx_ring[i].mapping)) { 350 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 351 ret = -ENOMEM; 352 goto err_count; 353 } 354 ret = ipoib_cm_post_receive_nonsrq(dev, rx, i); 355 if (ret) { 356 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 357 "failed for buf %d\n", i); 358 ret = -EIO; 359 goto err_count; 360 } 361 } 362 363 rx->recv_count = ipoib_recvq_size; 364 365 return 0; 366 367 err_count: 368 spin_lock_irq(&priv->lock); 369 --priv->cm.nonsrq_conn_qp; 370 spin_unlock_irq(&priv->lock); 371 372 err_free: 373 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 374 375 return ret; 376 } 377 378 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 379 struct ib_qp *qp, struct ib_cm_req_event_param *req, 380 unsigned psn) 381 { 382 struct ipoib_dev_priv *priv = netdev_priv(dev); 383 struct ipoib_cm_data data = {}; 384 struct ib_cm_rep_param rep = {}; 385 386 data.qpn = cpu_to_be32(priv->qp->qp_num); 387 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 388 389 rep.private_data = &data; 390 rep.private_data_len = sizeof data; 391 rep.flow_control = 0; 392 rep.rnr_retry_count = req->rnr_retry_count; 393 rep.srq = ipoib_cm_has_srq(dev); 394 rep.qp_num = qp->qp_num; 395 rep.starting_psn = psn; 396 return ib_send_cm_rep(cm_id, &rep); 397 } 398 399 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 400 { 401 struct net_device *dev = cm_id->context; 402 struct ipoib_dev_priv *priv = netdev_priv(dev); 403 struct ipoib_cm_rx *p; 404 unsigned psn; 405 int ret; 406 407 ipoib_dbg(priv, "REQ arrived\n"); 408 p = kzalloc(sizeof *p, GFP_KERNEL); 409 if (!p) 410 return -ENOMEM; 411 p->dev = dev; 412 p->id = cm_id; 413 cm_id->context = p; 414 p->state = IPOIB_CM_RX_LIVE; 415 p->jiffies = jiffies; 416 INIT_LIST_HEAD(&p->list); 417 418 p->qp = ipoib_cm_create_rx_qp(dev, p); 419 if (IS_ERR(p->qp)) { 420 ret = PTR_ERR(p->qp); 421 goto err_qp; 422 } 423 424 psn = random32() & 0xffffff; 425 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 426 if (ret) 427 goto err_modify; 428 429 if (!ipoib_cm_has_srq(dev)) { 430 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 431 if (ret) 432 goto err_modify; 433 } 434 435 spin_lock_irq(&priv->lock); 436 queue_delayed_work(ipoib_workqueue, 437 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 438 /* Add this entry to passive ids list head, but do not re-add it 439 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 440 p->jiffies = jiffies; 441 if (p->state == IPOIB_CM_RX_LIVE) 442 list_move(&p->list, &priv->cm.passive_ids); 443 spin_unlock_irq(&priv->lock); 444 445 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 446 if (ret) { 447 ipoib_warn(priv, "failed to send REP: %d\n", ret); 448 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 449 ipoib_warn(priv, "unable to move qp to error state\n"); 450 } 451 return 0; 452 453 err_modify: 454 ib_destroy_qp(p->qp); 455 err_qp: 456 kfree(p); 457 return ret; 458 } 459 460 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 461 struct ib_cm_event *event) 462 { 463 struct ipoib_cm_rx *p; 464 struct ipoib_dev_priv *priv; 465 466 switch (event->event) { 467 case IB_CM_REQ_RECEIVED: 468 return ipoib_cm_req_handler(cm_id, event); 469 case IB_CM_DREQ_RECEIVED: 470 p = cm_id->context; 471 ib_send_cm_drep(cm_id, NULL, 0); 472 /* Fall through */ 473 case IB_CM_REJ_RECEIVED: 474 p = cm_id->context; 475 priv = netdev_priv(p->dev); 476 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 477 ipoib_warn(priv, "unable to move qp to error state\n"); 478 /* Fall through */ 479 default: 480 return 0; 481 } 482 } 483 /* Adjust length of skb with fragments to match received data */ 484 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 485 unsigned int length, struct sk_buff *toskb) 486 { 487 int i, num_frags; 488 unsigned int size; 489 490 /* put header into skb */ 491 size = min(length, hdr_space); 492 skb->tail += size; 493 skb->len += size; 494 length -= size; 495 496 num_frags = skb_shinfo(skb)->nr_frags; 497 for (i = 0; i < num_frags; i++) { 498 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 499 500 if (length == 0) { 501 /* don't need this page */ 502 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE); 503 --skb_shinfo(skb)->nr_frags; 504 } else { 505 size = min(length, (unsigned) PAGE_SIZE); 506 507 frag->size = size; 508 skb->data_len += size; 509 skb->truesize += size; 510 skb->len += size; 511 length -= size; 512 } 513 } 514 } 515 516 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 517 { 518 struct ipoib_dev_priv *priv = netdev_priv(dev); 519 struct ipoib_cm_rx_buf *rx_ring; 520 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 521 struct sk_buff *skb, *newskb; 522 struct ipoib_cm_rx *p; 523 unsigned long flags; 524 u64 mapping[IPOIB_CM_RX_SG]; 525 int frags; 526 int has_srq; 527 528 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 529 wr_id, wc->status); 530 531 if (unlikely(wr_id >= ipoib_recvq_size)) { 532 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 533 spin_lock_irqsave(&priv->lock, flags); 534 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 535 ipoib_cm_start_rx_drain(priv); 536 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 537 spin_unlock_irqrestore(&priv->lock, flags); 538 } else 539 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 540 wr_id, ipoib_recvq_size); 541 return; 542 } 543 544 p = wc->qp->qp_context; 545 546 has_srq = ipoib_cm_has_srq(dev); 547 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 548 549 skb = rx_ring[wr_id].skb; 550 551 if (unlikely(wc->status != IB_WC_SUCCESS)) { 552 ipoib_dbg(priv, "cm recv error " 553 "(status=%d, wrid=%d vend_err %x)\n", 554 wc->status, wr_id, wc->vendor_err); 555 ++dev->stats.rx_dropped; 556 if (has_srq) 557 goto repost; 558 else { 559 if (!--p->recv_count) { 560 spin_lock_irqsave(&priv->lock, flags); 561 list_move(&p->list, &priv->cm.rx_reap_list); 562 spin_unlock_irqrestore(&priv->lock, flags); 563 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 564 } 565 return; 566 } 567 } 568 569 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 570 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 571 spin_lock_irqsave(&priv->lock, flags); 572 p->jiffies = jiffies; 573 /* Move this entry to list head, but do not re-add it 574 * if it has been moved out of list. */ 575 if (p->state == IPOIB_CM_RX_LIVE) 576 list_move(&p->list, &priv->cm.passive_ids); 577 spin_unlock_irqrestore(&priv->lock, flags); 578 } 579 } 580 581 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 582 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 583 584 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping); 585 if (unlikely(!newskb)) { 586 /* 587 * If we can't allocate a new RX buffer, dump 588 * this packet and reuse the old buffer. 589 */ 590 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 591 ++dev->stats.rx_dropped; 592 goto repost; 593 } 594 595 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 596 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 597 598 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 599 wc->byte_len, wc->slid); 600 601 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 602 603 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 604 skb_reset_mac_header(skb); 605 skb_pull(skb, IPOIB_ENCAP_LEN); 606 607 dev->last_rx = jiffies; 608 ++dev->stats.rx_packets; 609 dev->stats.rx_bytes += skb->len; 610 611 skb->dev = dev; 612 /* XXX get correct PACKET_ type here */ 613 skb->pkt_type = PACKET_HOST; 614 netif_receive_skb(skb); 615 616 repost: 617 if (has_srq) { 618 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 619 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 620 "for buf %d\n", wr_id); 621 } else { 622 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, wr_id))) { 623 --p->recv_count; 624 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 625 "for buf %d\n", wr_id); 626 } 627 } 628 } 629 630 static inline int post_send(struct ipoib_dev_priv *priv, 631 struct ipoib_cm_tx *tx, 632 unsigned int wr_id, 633 u64 addr, int len) 634 { 635 struct ib_send_wr *bad_wr; 636 637 priv->tx_sge.addr = addr; 638 priv->tx_sge.length = len; 639 640 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 641 642 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 643 } 644 645 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 646 { 647 struct ipoib_dev_priv *priv = netdev_priv(dev); 648 struct ipoib_tx_buf *tx_req; 649 u64 addr; 650 651 if (unlikely(skb->len > tx->mtu)) { 652 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 653 skb->len, tx->mtu); 654 ++dev->stats.tx_dropped; 655 ++dev->stats.tx_errors; 656 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 657 return; 658 } 659 660 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 661 tx->tx_head, skb->len, tx->qp->qp_num); 662 663 /* 664 * We put the skb into the tx_ring _before_ we call post_send() 665 * because it's entirely possible that the completion handler will 666 * run before we execute anything after the post_send(). That 667 * means we have to make sure everything is properly recorded and 668 * our state is consistent before we call post_send(). 669 */ 670 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 671 tx_req->skb = skb; 672 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 673 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 674 ++dev->stats.tx_errors; 675 dev_kfree_skb_any(skb); 676 return; 677 } 678 679 tx_req->mapping = addr; 680 681 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 682 addr, skb->len))) { 683 ipoib_warn(priv, "post_send failed\n"); 684 ++dev->stats.tx_errors; 685 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 686 dev_kfree_skb_any(skb); 687 } else { 688 dev->trans_start = jiffies; 689 ++tx->tx_head; 690 691 if (++priv->tx_outstanding == ipoib_sendq_size) { 692 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 693 tx->qp->qp_num); 694 netif_stop_queue(dev); 695 } 696 } 697 } 698 699 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 700 { 701 struct ipoib_dev_priv *priv = netdev_priv(dev); 702 struct ipoib_cm_tx *tx = wc->qp->qp_context; 703 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 704 struct ipoib_tx_buf *tx_req; 705 unsigned long flags; 706 707 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 708 wr_id, wc->status); 709 710 if (unlikely(wr_id >= ipoib_sendq_size)) { 711 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 712 wr_id, ipoib_sendq_size); 713 return; 714 } 715 716 tx_req = &tx->tx_ring[wr_id]; 717 718 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 719 720 /* FIXME: is this right? Shouldn't we only increment on success? */ 721 ++dev->stats.tx_packets; 722 dev->stats.tx_bytes += tx_req->skb->len; 723 724 dev_kfree_skb_any(tx_req->skb); 725 726 spin_lock_irqsave(&priv->tx_lock, flags); 727 ++tx->tx_tail; 728 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 729 netif_queue_stopped(dev) && 730 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 731 netif_wake_queue(dev); 732 733 if (wc->status != IB_WC_SUCCESS && 734 wc->status != IB_WC_WR_FLUSH_ERR) { 735 struct ipoib_neigh *neigh; 736 737 ipoib_dbg(priv, "failed cm send event " 738 "(status=%d, wrid=%d vend_err %x)\n", 739 wc->status, wr_id, wc->vendor_err); 740 741 spin_lock(&priv->lock); 742 neigh = tx->neigh; 743 744 if (neigh) { 745 neigh->cm = NULL; 746 list_del(&neigh->list); 747 if (neigh->ah) 748 ipoib_put_ah(neigh->ah); 749 ipoib_neigh_free(dev, neigh); 750 751 tx->neigh = NULL; 752 } 753 754 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 755 list_move(&tx->list, &priv->cm.reap_list); 756 queue_work(ipoib_workqueue, &priv->cm.reap_task); 757 } 758 759 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 760 761 spin_unlock(&priv->lock); 762 } 763 764 spin_unlock_irqrestore(&priv->tx_lock, flags); 765 } 766 767 int ipoib_cm_dev_open(struct net_device *dev) 768 { 769 struct ipoib_dev_priv *priv = netdev_priv(dev); 770 int ret; 771 772 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 773 return 0; 774 775 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 776 if (IS_ERR(priv->cm.id)) { 777 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 778 ret = PTR_ERR(priv->cm.id); 779 goto err_cm; 780 } 781 782 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 783 0, NULL); 784 if (ret) { 785 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 786 IPOIB_CM_IETF_ID | priv->qp->qp_num); 787 goto err_listen; 788 } 789 790 return 0; 791 792 err_listen: 793 ib_destroy_cm_id(priv->cm.id); 794 err_cm: 795 priv->cm.id = NULL; 796 return ret; 797 } 798 799 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 800 { 801 struct ipoib_dev_priv *priv = netdev_priv(dev); 802 struct ipoib_cm_rx *rx, *n; 803 LIST_HEAD(list); 804 805 spin_lock_irq(&priv->lock); 806 list_splice_init(&priv->cm.rx_reap_list, &list); 807 spin_unlock_irq(&priv->lock); 808 809 list_for_each_entry_safe(rx, n, &list, list) { 810 ib_destroy_cm_id(rx->id); 811 ib_destroy_qp(rx->qp); 812 if (!ipoib_cm_has_srq(dev)) { 813 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 814 spin_lock_irq(&priv->lock); 815 --priv->cm.nonsrq_conn_qp; 816 spin_unlock_irq(&priv->lock); 817 } 818 kfree(rx); 819 } 820 } 821 822 void ipoib_cm_dev_stop(struct net_device *dev) 823 { 824 struct ipoib_dev_priv *priv = netdev_priv(dev); 825 struct ipoib_cm_rx *p; 826 unsigned long begin; 827 LIST_HEAD(list); 828 int ret; 829 830 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 831 return; 832 833 ib_destroy_cm_id(priv->cm.id); 834 priv->cm.id = NULL; 835 836 spin_lock_irq(&priv->lock); 837 while (!list_empty(&priv->cm.passive_ids)) { 838 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 839 list_move(&p->list, &priv->cm.rx_error_list); 840 p->state = IPOIB_CM_RX_ERROR; 841 spin_unlock_irq(&priv->lock); 842 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 843 if (ret) 844 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 845 spin_lock_irq(&priv->lock); 846 } 847 848 /* Wait for all RX to be drained */ 849 begin = jiffies; 850 851 while (!list_empty(&priv->cm.rx_error_list) || 852 !list_empty(&priv->cm.rx_flush_list) || 853 !list_empty(&priv->cm.rx_drain_list)) { 854 if (time_after(jiffies, begin + 5 * HZ)) { 855 ipoib_warn(priv, "RX drain timing out\n"); 856 857 /* 858 * assume the HW is wedged and just free up everything. 859 */ 860 list_splice_init(&priv->cm.rx_flush_list, &list); 861 list_splice_init(&priv->cm.rx_error_list, &list); 862 list_splice_init(&priv->cm.rx_drain_list, &list); 863 break; 864 } 865 spin_unlock_irq(&priv->lock); 866 msleep(1); 867 ipoib_drain_cq(dev); 868 spin_lock_irq(&priv->lock); 869 } 870 871 spin_unlock_irq(&priv->lock); 872 873 ipoib_cm_free_rx_reap_list(dev); 874 875 cancel_delayed_work(&priv->cm.stale_task); 876 } 877 878 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 879 { 880 struct ipoib_cm_tx *p = cm_id->context; 881 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 882 struct ipoib_cm_data *data = event->private_data; 883 struct sk_buff_head skqueue; 884 struct ib_qp_attr qp_attr; 885 int qp_attr_mask, ret; 886 struct sk_buff *skb; 887 888 p->mtu = be32_to_cpu(data->mtu); 889 890 if (p->mtu <= IPOIB_ENCAP_LEN) { 891 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 892 p->mtu, IPOIB_ENCAP_LEN); 893 return -EINVAL; 894 } 895 896 qp_attr.qp_state = IB_QPS_RTR; 897 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 898 if (ret) { 899 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 900 return ret; 901 } 902 903 qp_attr.rq_psn = 0 /* FIXME */; 904 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 905 if (ret) { 906 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 907 return ret; 908 } 909 910 qp_attr.qp_state = IB_QPS_RTS; 911 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 912 if (ret) { 913 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 914 return ret; 915 } 916 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 917 if (ret) { 918 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 919 return ret; 920 } 921 922 skb_queue_head_init(&skqueue); 923 924 spin_lock_irq(&priv->lock); 925 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 926 if (p->neigh) 927 while ((skb = __skb_dequeue(&p->neigh->queue))) 928 __skb_queue_tail(&skqueue, skb); 929 spin_unlock_irq(&priv->lock); 930 931 while ((skb = __skb_dequeue(&skqueue))) { 932 skb->dev = p->dev; 933 if (dev_queue_xmit(skb)) 934 ipoib_warn(priv, "dev_queue_xmit failed " 935 "to requeue packet\n"); 936 } 937 938 ret = ib_send_cm_rtu(cm_id, NULL, 0); 939 if (ret) { 940 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 941 return ret; 942 } 943 return 0; 944 } 945 946 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 947 { 948 struct ipoib_dev_priv *priv = netdev_priv(dev); 949 struct ib_qp_init_attr attr = { 950 .send_cq = priv->cq, 951 .recv_cq = priv->cq, 952 .srq = priv->cm.srq, 953 .cap.max_send_wr = ipoib_sendq_size, 954 .cap.max_send_sge = 1, 955 .sq_sig_type = IB_SIGNAL_ALL_WR, 956 .qp_type = IB_QPT_RC, 957 .qp_context = tx 958 }; 959 960 return ib_create_qp(priv->pd, &attr); 961 } 962 963 static int ipoib_cm_send_req(struct net_device *dev, 964 struct ib_cm_id *id, struct ib_qp *qp, 965 u32 qpn, 966 struct ib_sa_path_rec *pathrec) 967 { 968 struct ipoib_dev_priv *priv = netdev_priv(dev); 969 struct ipoib_cm_data data = {}; 970 struct ib_cm_req_param req = {}; 971 972 data.qpn = cpu_to_be32(priv->qp->qp_num); 973 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 974 975 req.primary_path = pathrec; 976 req.alternate_path = NULL; 977 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 978 req.qp_num = qp->qp_num; 979 req.qp_type = qp->qp_type; 980 req.private_data = &data; 981 req.private_data_len = sizeof data; 982 req.flow_control = 0; 983 984 req.starting_psn = 0; /* FIXME */ 985 986 /* 987 * Pick some arbitrary defaults here; we could make these 988 * module parameters if anyone cared about setting them. 989 */ 990 req.responder_resources = 4; 991 req.remote_cm_response_timeout = 20; 992 req.local_cm_response_timeout = 20; 993 req.retry_count = 0; /* RFC draft warns against retries */ 994 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 995 req.max_cm_retries = 15; 996 req.srq = ipoib_cm_has_srq(dev); 997 return ib_send_cm_req(id, &req); 998 } 999 1000 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1001 struct ib_cm_id *cm_id, struct ib_qp *qp) 1002 { 1003 struct ipoib_dev_priv *priv = netdev_priv(dev); 1004 struct ib_qp_attr qp_attr; 1005 int qp_attr_mask, ret; 1006 ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1007 if (ret) { 1008 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret); 1009 return ret; 1010 } 1011 1012 qp_attr.qp_state = IB_QPS_INIT; 1013 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1014 qp_attr.port_num = priv->port; 1015 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1016 1017 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1018 if (ret) { 1019 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1020 return ret; 1021 } 1022 return 0; 1023 } 1024 1025 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1026 struct ib_sa_path_rec *pathrec) 1027 { 1028 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1029 int ret; 1030 1031 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, 1032 GFP_KERNEL); 1033 if (!p->tx_ring) { 1034 ipoib_warn(priv, "failed to allocate tx ring\n"); 1035 ret = -ENOMEM; 1036 goto err_tx; 1037 } 1038 1039 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1040 if (IS_ERR(p->qp)) { 1041 ret = PTR_ERR(p->qp); 1042 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1043 goto err_qp; 1044 } 1045 1046 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1047 if (IS_ERR(p->id)) { 1048 ret = PTR_ERR(p->id); 1049 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1050 goto err_id; 1051 } 1052 1053 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1054 if (ret) { 1055 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1056 goto err_modify; 1057 } 1058 1059 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1060 if (ret) { 1061 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1062 goto err_send_cm; 1063 } 1064 1065 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n", 1066 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn); 1067 1068 return 0; 1069 1070 err_send_cm: 1071 err_modify: 1072 ib_destroy_cm_id(p->id); 1073 err_id: 1074 p->id = NULL; 1075 ib_destroy_qp(p->qp); 1076 err_qp: 1077 p->qp = NULL; 1078 err_tx: 1079 return ret; 1080 } 1081 1082 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1083 { 1084 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1085 struct ipoib_tx_buf *tx_req; 1086 unsigned long flags; 1087 unsigned long begin; 1088 1089 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1090 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1091 1092 if (p->id) 1093 ib_destroy_cm_id(p->id); 1094 1095 if (p->tx_ring) { 1096 /* Wait for all sends to complete */ 1097 begin = jiffies; 1098 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1099 if (time_after(jiffies, begin + 5 * HZ)) { 1100 ipoib_warn(priv, "timing out; %d sends not completed\n", 1101 p->tx_head - p->tx_tail); 1102 goto timeout; 1103 } 1104 1105 msleep(1); 1106 } 1107 } 1108 1109 timeout: 1110 1111 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1112 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1113 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 1114 DMA_TO_DEVICE); 1115 dev_kfree_skb_any(tx_req->skb); 1116 ++p->tx_tail; 1117 spin_lock_irqsave(&priv->tx_lock, flags); 1118 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1119 netif_queue_stopped(p->dev) && 1120 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1121 netif_wake_queue(p->dev); 1122 spin_unlock_irqrestore(&priv->tx_lock, flags); 1123 } 1124 1125 if (p->qp) 1126 ib_destroy_qp(p->qp); 1127 1128 kfree(p->tx_ring); 1129 kfree(p); 1130 } 1131 1132 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1133 struct ib_cm_event *event) 1134 { 1135 struct ipoib_cm_tx *tx = cm_id->context; 1136 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1137 struct net_device *dev = priv->dev; 1138 struct ipoib_neigh *neigh; 1139 int ret; 1140 1141 switch (event->event) { 1142 case IB_CM_DREQ_RECEIVED: 1143 ipoib_dbg(priv, "DREQ received.\n"); 1144 ib_send_cm_drep(cm_id, NULL, 0); 1145 break; 1146 case IB_CM_REP_RECEIVED: 1147 ipoib_dbg(priv, "REP received.\n"); 1148 ret = ipoib_cm_rep_handler(cm_id, event); 1149 if (ret) 1150 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1151 NULL, 0, NULL, 0); 1152 break; 1153 case IB_CM_REQ_ERROR: 1154 case IB_CM_REJ_RECEIVED: 1155 case IB_CM_TIMEWAIT_EXIT: 1156 ipoib_dbg(priv, "CM error %d.\n", event->event); 1157 spin_lock_irq(&priv->tx_lock); 1158 spin_lock(&priv->lock); 1159 neigh = tx->neigh; 1160 1161 if (neigh) { 1162 neigh->cm = NULL; 1163 list_del(&neigh->list); 1164 if (neigh->ah) 1165 ipoib_put_ah(neigh->ah); 1166 ipoib_neigh_free(dev, neigh); 1167 1168 tx->neigh = NULL; 1169 } 1170 1171 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1172 list_move(&tx->list, &priv->cm.reap_list); 1173 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1174 } 1175 1176 spin_unlock(&priv->lock); 1177 spin_unlock_irq(&priv->tx_lock); 1178 break; 1179 default: 1180 break; 1181 } 1182 1183 return 0; 1184 } 1185 1186 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1187 struct ipoib_neigh *neigh) 1188 { 1189 struct ipoib_dev_priv *priv = netdev_priv(dev); 1190 struct ipoib_cm_tx *tx; 1191 1192 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1193 if (!tx) 1194 return NULL; 1195 1196 neigh->cm = tx; 1197 tx->neigh = neigh; 1198 tx->path = path; 1199 tx->dev = dev; 1200 list_add(&tx->list, &priv->cm.start_list); 1201 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1202 queue_work(ipoib_workqueue, &priv->cm.start_task); 1203 return tx; 1204 } 1205 1206 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1207 { 1208 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1209 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1210 list_move(&tx->list, &priv->cm.reap_list); 1211 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1212 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n", 1213 IPOIB_GID_ARG(tx->neigh->dgid)); 1214 tx->neigh = NULL; 1215 } 1216 } 1217 1218 static void ipoib_cm_tx_start(struct work_struct *work) 1219 { 1220 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1221 cm.start_task); 1222 struct net_device *dev = priv->dev; 1223 struct ipoib_neigh *neigh; 1224 struct ipoib_cm_tx *p; 1225 unsigned long flags; 1226 int ret; 1227 1228 struct ib_sa_path_rec pathrec; 1229 u32 qpn; 1230 1231 spin_lock_irqsave(&priv->tx_lock, flags); 1232 spin_lock(&priv->lock); 1233 while (!list_empty(&priv->cm.start_list)) { 1234 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1235 list_del_init(&p->list); 1236 neigh = p->neigh; 1237 qpn = IPOIB_QPN(neigh->neighbour->ha); 1238 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1239 spin_unlock(&priv->lock); 1240 spin_unlock_irqrestore(&priv->tx_lock, flags); 1241 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1242 spin_lock_irqsave(&priv->tx_lock, flags); 1243 spin_lock(&priv->lock); 1244 if (ret) { 1245 neigh = p->neigh; 1246 if (neigh) { 1247 neigh->cm = NULL; 1248 list_del(&neigh->list); 1249 if (neigh->ah) 1250 ipoib_put_ah(neigh->ah); 1251 ipoib_neigh_free(dev, neigh); 1252 } 1253 list_del(&p->list); 1254 kfree(p); 1255 } 1256 } 1257 spin_unlock(&priv->lock); 1258 spin_unlock_irqrestore(&priv->tx_lock, flags); 1259 } 1260 1261 static void ipoib_cm_tx_reap(struct work_struct *work) 1262 { 1263 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1264 cm.reap_task); 1265 struct ipoib_cm_tx *p; 1266 1267 spin_lock_irq(&priv->tx_lock); 1268 spin_lock(&priv->lock); 1269 while (!list_empty(&priv->cm.reap_list)) { 1270 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1271 list_del(&p->list); 1272 spin_unlock(&priv->lock); 1273 spin_unlock_irq(&priv->tx_lock); 1274 ipoib_cm_tx_destroy(p); 1275 spin_lock_irq(&priv->tx_lock); 1276 spin_lock(&priv->lock); 1277 } 1278 spin_unlock(&priv->lock); 1279 spin_unlock_irq(&priv->tx_lock); 1280 } 1281 1282 static void ipoib_cm_skb_reap(struct work_struct *work) 1283 { 1284 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1285 cm.skb_task); 1286 struct sk_buff *skb; 1287 1288 unsigned mtu = priv->mcast_mtu; 1289 1290 spin_lock_irq(&priv->tx_lock); 1291 spin_lock(&priv->lock); 1292 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1293 spin_unlock(&priv->lock); 1294 spin_unlock_irq(&priv->tx_lock); 1295 if (skb->protocol == htons(ETH_P_IP)) 1296 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1297 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1298 else if (skb->protocol == htons(ETH_P_IPV6)) 1299 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev); 1300 #endif 1301 dev_kfree_skb_any(skb); 1302 spin_lock_irq(&priv->tx_lock); 1303 spin_lock(&priv->lock); 1304 } 1305 spin_unlock(&priv->lock); 1306 spin_unlock_irq(&priv->tx_lock); 1307 } 1308 1309 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1310 unsigned int mtu) 1311 { 1312 struct ipoib_dev_priv *priv = netdev_priv(dev); 1313 int e = skb_queue_empty(&priv->cm.skb_queue); 1314 1315 if (skb->dst) 1316 skb->dst->ops->update_pmtu(skb->dst, mtu); 1317 1318 skb_queue_tail(&priv->cm.skb_queue, skb); 1319 if (e) 1320 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1321 } 1322 1323 static void ipoib_cm_rx_reap(struct work_struct *work) 1324 { 1325 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1326 cm.rx_reap_task)->dev); 1327 } 1328 1329 static void ipoib_cm_stale_task(struct work_struct *work) 1330 { 1331 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1332 cm.stale_task.work); 1333 struct ipoib_cm_rx *p; 1334 int ret; 1335 1336 spin_lock_irq(&priv->lock); 1337 while (!list_empty(&priv->cm.passive_ids)) { 1338 /* List is sorted by LRU, start from tail, 1339 * stop when we see a recently used entry */ 1340 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1341 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1342 break; 1343 list_move(&p->list, &priv->cm.rx_error_list); 1344 p->state = IPOIB_CM_RX_ERROR; 1345 spin_unlock_irq(&priv->lock); 1346 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1347 if (ret) 1348 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1349 spin_lock_irq(&priv->lock); 1350 } 1351 1352 if (!list_empty(&priv->cm.passive_ids)) 1353 queue_delayed_work(ipoib_workqueue, 1354 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1355 spin_unlock_irq(&priv->lock); 1356 } 1357 1358 1359 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1360 char *buf) 1361 { 1362 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1363 1364 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1365 return sprintf(buf, "connected\n"); 1366 else 1367 return sprintf(buf, "datagram\n"); 1368 } 1369 1370 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1371 const char *buf, size_t count) 1372 { 1373 struct net_device *dev = to_net_dev(d); 1374 struct ipoib_dev_priv *priv = netdev_priv(dev); 1375 1376 /* flush paths if we switch modes so that connections are restarted */ 1377 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 1378 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1379 ipoib_warn(priv, "enabling connected mode " 1380 "will cause multicast packet drops\n"); 1381 ipoib_flush_paths(dev); 1382 return count; 1383 } 1384 1385 if (!strcmp(buf, "datagram\n")) { 1386 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1387 dev->mtu = min(priv->mcast_mtu, dev->mtu); 1388 ipoib_flush_paths(dev); 1389 return count; 1390 } 1391 1392 return -EINVAL; 1393 } 1394 1395 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1396 1397 int ipoib_cm_add_mode_attr(struct net_device *dev) 1398 { 1399 return device_create_file(&dev->dev, &dev_attr_mode); 1400 } 1401 1402 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1403 { 1404 struct ipoib_dev_priv *priv = netdev_priv(dev); 1405 struct ib_srq_init_attr srq_init_attr = { 1406 .attr = { 1407 .max_wr = ipoib_recvq_size, 1408 .max_sge = max_sge 1409 } 1410 }; 1411 1412 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1413 if (IS_ERR(priv->cm.srq)) { 1414 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1415 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1416 priv->ca->name, PTR_ERR(priv->cm.srq)); 1417 priv->cm.srq = NULL; 1418 return; 1419 } 1420 1421 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, 1422 GFP_KERNEL); 1423 if (!priv->cm.srq_ring) { 1424 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1425 priv->ca->name, ipoib_recvq_size); 1426 ib_destroy_srq(priv->cm.srq); 1427 priv->cm.srq = NULL; 1428 } 1429 } 1430 1431 int ipoib_cm_dev_init(struct net_device *dev) 1432 { 1433 struct ipoib_dev_priv *priv = netdev_priv(dev); 1434 int i, ret; 1435 struct ib_device_attr attr; 1436 1437 INIT_LIST_HEAD(&priv->cm.passive_ids); 1438 INIT_LIST_HEAD(&priv->cm.reap_list); 1439 INIT_LIST_HEAD(&priv->cm.start_list); 1440 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1441 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1442 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1443 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1444 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1445 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1446 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1447 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1448 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1449 1450 skb_queue_head_init(&priv->cm.skb_queue); 1451 1452 ret = ib_query_device(priv->ca, &attr); 1453 if (ret) { 1454 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1455 return ret; 1456 } 1457 1458 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1459 1460 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1461 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1462 if (ipoib_cm_has_srq(dev)) { 1463 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1464 priv->cm.num_frags = attr.max_srq_sge; 1465 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1466 priv->cm.max_cm_mtu, priv->cm.num_frags); 1467 } else { 1468 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1469 priv->cm.num_frags = IPOIB_CM_RX_SG; 1470 } 1471 1472 for (i = 0; i < priv->cm.num_frags; ++i) 1473 priv->cm.rx_sge[i].lkey = priv->mr->lkey; 1474 1475 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE; 1476 for (i = 1; i < priv->cm.num_frags; ++i) 1477 priv->cm.rx_sge[i].length = PAGE_SIZE; 1478 priv->cm.rx_wr.next = NULL; 1479 priv->cm.rx_wr.sg_list = priv->cm.rx_sge; 1480 priv->cm.rx_wr.num_sge = priv->cm.num_frags; 1481 1482 if (ipoib_cm_has_srq(dev)) { 1483 for (i = 0; i < ipoib_recvq_size; ++i) { 1484 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1485 priv->cm.num_frags - 1, 1486 priv->cm.srq_ring[i].mapping)) { 1487 ipoib_warn(priv, "failed to allocate " 1488 "receive buffer %d\n", i); 1489 ipoib_cm_dev_cleanup(dev); 1490 return -ENOMEM; 1491 } 1492 1493 if (ipoib_cm_post_receive_srq(dev, i)) { 1494 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1495 "failed for buf %d\n", i); 1496 ipoib_cm_dev_cleanup(dev); 1497 return -EIO; 1498 } 1499 } 1500 } 1501 1502 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1503 return 0; 1504 } 1505 1506 void ipoib_cm_dev_cleanup(struct net_device *dev) 1507 { 1508 struct ipoib_dev_priv *priv = netdev_priv(dev); 1509 int ret; 1510 1511 if (!priv->cm.srq) 1512 return; 1513 1514 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1515 1516 ret = ib_destroy_srq(priv->cm.srq); 1517 if (ret) 1518 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1519 1520 priv->cm.srq = NULL; 1521 if (!priv->cm.srq_ring) 1522 return; 1523 1524 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1525 priv->cm.srq_ring = NULL; 1526 } 1527