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 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 43 static int data_debug_level; 44 45 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 46 MODULE_PARM_DESC(cm_data_debug_level, 47 "Enable data path debug tracing for connected mode if > 0"); 48 #endif 49 50 #include "ipoib.h" 51 52 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 53 54 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 55 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 56 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 57 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 58 59 static struct ib_qp_attr ipoib_cm_err_attr = { 60 .qp_state = IB_QPS_ERR 61 }; 62 63 #define IPOIB_CM_RX_DRAIN_WRID 0x7fffffff 64 65 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 66 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 67 .opcode = IB_WR_SEND, 68 }; 69 70 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 71 struct ib_cm_event *event); 72 73 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 74 u64 mapping[IPOIB_CM_RX_SG]) 75 { 76 int i; 77 78 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 79 80 for (i = 0; i < frags; ++i) 81 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 82 } 83 84 static int ipoib_cm_post_receive(struct net_device *dev, int id) 85 { 86 struct ipoib_dev_priv *priv = netdev_priv(dev); 87 struct ib_recv_wr *bad_wr; 88 int i, ret; 89 90 priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ; 91 92 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 93 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 94 95 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 96 if (unlikely(ret)) { 97 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 98 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 99 priv->cm.srq_ring[id].mapping); 100 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 101 priv->cm.srq_ring[id].skb = NULL; 102 } 103 104 return ret; 105 } 106 107 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags, 108 u64 mapping[IPOIB_CM_RX_SG]) 109 { 110 struct ipoib_dev_priv *priv = netdev_priv(dev); 111 struct sk_buff *skb; 112 int i; 113 114 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 115 if (unlikely(!skb)) 116 return NULL; 117 118 /* 119 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 120 * IP header to a multiple of 16. 121 */ 122 skb_reserve(skb, 12); 123 124 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 125 DMA_FROM_DEVICE); 126 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 127 dev_kfree_skb_any(skb); 128 return NULL; 129 } 130 131 for (i = 0; i < frags; i++) { 132 struct page *page = alloc_page(GFP_ATOMIC); 133 134 if (!page) 135 goto partial_error; 136 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 137 138 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page, 139 0, PAGE_SIZE, DMA_FROM_DEVICE); 140 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 141 goto partial_error; 142 } 143 144 priv->cm.srq_ring[id].skb = skb; 145 return skb; 146 147 partial_error: 148 149 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 150 151 for (; i > 0; --i) 152 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 153 154 dev_kfree_skb_any(skb); 155 return NULL; 156 } 157 158 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv* priv) 159 { 160 struct ib_send_wr *bad_wr; 161 struct ipoib_cm_rx *p; 162 163 /* We only reserved 1 extra slot in CQ for drain WRs, so 164 * make sure we have at most 1 outstanding WR. */ 165 if (list_empty(&priv->cm.rx_flush_list) || 166 !list_empty(&priv->cm.rx_drain_list)) 167 return; 168 169 /* 170 * QPs on flush list are error state. This way, a "flush 171 * error" WC will be immediately generated for each WR we post. 172 */ 173 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 174 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 175 ipoib_warn(priv, "failed to post drain wr\n"); 176 177 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 178 } 179 180 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 181 { 182 struct ipoib_cm_rx *p = ctx; 183 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 184 unsigned long flags; 185 186 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 187 return; 188 189 spin_lock_irqsave(&priv->lock, flags); 190 list_move(&p->list, &priv->cm.rx_flush_list); 191 p->state = IPOIB_CM_RX_FLUSH; 192 ipoib_cm_start_rx_drain(priv); 193 spin_unlock_irqrestore(&priv->lock, flags); 194 } 195 196 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 197 struct ipoib_cm_rx *p) 198 { 199 struct ipoib_dev_priv *priv = netdev_priv(dev); 200 struct ib_qp_init_attr attr = { 201 .event_handler = ipoib_cm_rx_event_handler, 202 .send_cq = priv->cq, /* For drain WR */ 203 .recv_cq = priv->cq, 204 .srq = priv->cm.srq, 205 .cap.max_send_wr = 1, /* For drain WR */ 206 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 207 .sq_sig_type = IB_SIGNAL_ALL_WR, 208 .qp_type = IB_QPT_RC, 209 .qp_context = p, 210 }; 211 return ib_create_qp(priv->pd, &attr); 212 } 213 214 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 215 struct ib_cm_id *cm_id, struct ib_qp *qp, 216 unsigned psn) 217 { 218 struct ipoib_dev_priv *priv = netdev_priv(dev); 219 struct ib_qp_attr qp_attr; 220 int qp_attr_mask, ret; 221 222 qp_attr.qp_state = IB_QPS_INIT; 223 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 224 if (ret) { 225 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 226 return ret; 227 } 228 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 229 if (ret) { 230 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 231 return ret; 232 } 233 qp_attr.qp_state = IB_QPS_RTR; 234 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 235 if (ret) { 236 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 237 return ret; 238 } 239 qp_attr.rq_psn = psn; 240 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 241 if (ret) { 242 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 243 return ret; 244 } 245 246 /* 247 * Current Mellanox HCA firmware won't generate completions 248 * with error for drain WRs unless the QP has been moved to 249 * RTS first. This work-around leaves a window where a QP has 250 * moved to error asynchronously, but this will eventually get 251 * fixed in firmware, so let's not error out if modify QP 252 * fails. 253 */ 254 qp_attr.qp_state = IB_QPS_RTS; 255 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 256 if (ret) { 257 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 258 return 0; 259 } 260 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 261 if (ret) { 262 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 263 return 0; 264 } 265 266 return 0; 267 } 268 269 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 270 struct ib_qp *qp, struct ib_cm_req_event_param *req, 271 unsigned psn) 272 { 273 struct ipoib_dev_priv *priv = netdev_priv(dev); 274 struct ipoib_cm_data data = {}; 275 struct ib_cm_rep_param rep = {}; 276 277 data.qpn = cpu_to_be32(priv->qp->qp_num); 278 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 279 280 rep.private_data = &data; 281 rep.private_data_len = sizeof data; 282 rep.flow_control = 0; 283 rep.rnr_retry_count = req->rnr_retry_count; 284 rep.srq = 1; 285 rep.qp_num = qp->qp_num; 286 rep.starting_psn = psn; 287 return ib_send_cm_rep(cm_id, &rep); 288 } 289 290 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 291 { 292 struct net_device *dev = cm_id->context; 293 struct ipoib_dev_priv *priv = netdev_priv(dev); 294 struct ipoib_cm_rx *p; 295 unsigned psn; 296 int ret; 297 298 ipoib_dbg(priv, "REQ arrived\n"); 299 p = kzalloc(sizeof *p, GFP_KERNEL); 300 if (!p) 301 return -ENOMEM; 302 p->dev = dev; 303 p->id = cm_id; 304 cm_id->context = p; 305 p->state = IPOIB_CM_RX_LIVE; 306 p->jiffies = jiffies; 307 INIT_LIST_HEAD(&p->list); 308 309 p->qp = ipoib_cm_create_rx_qp(dev, p); 310 if (IS_ERR(p->qp)) { 311 ret = PTR_ERR(p->qp); 312 goto err_qp; 313 } 314 315 psn = random32() & 0xffffff; 316 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 317 if (ret) 318 goto err_modify; 319 320 spin_lock_irq(&priv->lock); 321 queue_delayed_work(ipoib_workqueue, 322 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 323 /* Add this entry to passive ids list head, but do not re-add it 324 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 325 p->jiffies = jiffies; 326 if (p->state == IPOIB_CM_RX_LIVE) 327 list_move(&p->list, &priv->cm.passive_ids); 328 spin_unlock_irq(&priv->lock); 329 330 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 331 if (ret) { 332 ipoib_warn(priv, "failed to send REP: %d\n", ret); 333 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 334 ipoib_warn(priv, "unable to move qp to error state\n"); 335 } 336 return 0; 337 338 err_modify: 339 ib_destroy_qp(p->qp); 340 err_qp: 341 kfree(p); 342 return ret; 343 } 344 345 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 346 struct ib_cm_event *event) 347 { 348 struct ipoib_cm_rx *p; 349 struct ipoib_dev_priv *priv; 350 351 switch (event->event) { 352 case IB_CM_REQ_RECEIVED: 353 return ipoib_cm_req_handler(cm_id, event); 354 case IB_CM_DREQ_RECEIVED: 355 p = cm_id->context; 356 ib_send_cm_drep(cm_id, NULL, 0); 357 /* Fall through */ 358 case IB_CM_REJ_RECEIVED: 359 p = cm_id->context; 360 priv = netdev_priv(p->dev); 361 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 362 ipoib_warn(priv, "unable to move qp to error state\n"); 363 /* Fall through */ 364 default: 365 return 0; 366 } 367 } 368 /* Adjust length of skb with fragments to match received data */ 369 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 370 unsigned int length, struct sk_buff *toskb) 371 { 372 int i, num_frags; 373 unsigned int size; 374 375 /* put header into skb */ 376 size = min(length, hdr_space); 377 skb->tail += size; 378 skb->len += size; 379 length -= size; 380 381 num_frags = skb_shinfo(skb)->nr_frags; 382 for (i = 0; i < num_frags; i++) { 383 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 384 385 if (length == 0) { 386 /* don't need this page */ 387 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE); 388 --skb_shinfo(skb)->nr_frags; 389 } else { 390 size = min(length, (unsigned) PAGE_SIZE); 391 392 frag->size = size; 393 skb->data_len += size; 394 skb->truesize += size; 395 skb->len += size; 396 length -= size; 397 } 398 } 399 } 400 401 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 402 { 403 struct ipoib_dev_priv *priv = netdev_priv(dev); 404 unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ; 405 struct sk_buff *skb, *newskb; 406 struct ipoib_cm_rx *p; 407 unsigned long flags; 408 u64 mapping[IPOIB_CM_RX_SG]; 409 int frags; 410 411 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 412 wr_id, wc->status); 413 414 if (unlikely(wr_id >= ipoib_recvq_size)) { 415 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~IPOIB_CM_OP_SRQ)) { 416 spin_lock_irqsave(&priv->lock, flags); 417 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 418 ipoib_cm_start_rx_drain(priv); 419 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 420 spin_unlock_irqrestore(&priv->lock, flags); 421 } else 422 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 423 wr_id, ipoib_recvq_size); 424 return; 425 } 426 427 skb = priv->cm.srq_ring[wr_id].skb; 428 429 if (unlikely(wc->status != IB_WC_SUCCESS)) { 430 ipoib_dbg(priv, "cm recv error " 431 "(status=%d, wrid=%d vend_err %x)\n", 432 wc->status, wr_id, wc->vendor_err); 433 ++dev->stats.rx_dropped; 434 goto repost; 435 } 436 437 if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) { 438 p = wc->qp->qp_context; 439 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 440 spin_lock_irqsave(&priv->lock, flags); 441 p->jiffies = jiffies; 442 /* Move this entry to list head, but do not re-add it 443 * if it has been moved out of list. */ 444 if (p->state == IPOIB_CM_RX_LIVE) 445 list_move(&p->list, &priv->cm.passive_ids); 446 spin_unlock_irqrestore(&priv->lock, flags); 447 } 448 } 449 450 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 451 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 452 453 newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping); 454 if (unlikely(!newskb)) { 455 /* 456 * If we can't allocate a new RX buffer, dump 457 * this packet and reuse the old buffer. 458 */ 459 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 460 ++dev->stats.rx_dropped; 461 goto repost; 462 } 463 464 ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping); 465 memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 466 467 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 468 wc->byte_len, wc->slid); 469 470 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 471 472 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 473 skb_reset_mac_header(skb); 474 skb_pull(skb, IPOIB_ENCAP_LEN); 475 476 dev->last_rx = jiffies; 477 ++dev->stats.rx_packets; 478 dev->stats.rx_bytes += skb->len; 479 480 skb->dev = dev; 481 /* XXX get correct PACKET_ type here */ 482 skb->pkt_type = PACKET_HOST; 483 netif_receive_skb(skb); 484 485 repost: 486 if (unlikely(ipoib_cm_post_receive(dev, wr_id))) 487 ipoib_warn(priv, "ipoib_cm_post_receive failed " 488 "for buf %d\n", wr_id); 489 } 490 491 static inline int post_send(struct ipoib_dev_priv *priv, 492 struct ipoib_cm_tx *tx, 493 unsigned int wr_id, 494 u64 addr, int len) 495 { 496 struct ib_send_wr *bad_wr; 497 498 priv->tx_sge.addr = addr; 499 priv->tx_sge.length = len; 500 501 priv->tx_wr.wr_id = wr_id; 502 503 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 504 } 505 506 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 507 { 508 struct ipoib_dev_priv *priv = netdev_priv(dev); 509 struct ipoib_tx_buf *tx_req; 510 u64 addr; 511 512 if (unlikely(skb->len > tx->mtu)) { 513 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 514 skb->len, tx->mtu); 515 ++dev->stats.tx_dropped; 516 ++dev->stats.tx_errors; 517 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 518 return; 519 } 520 521 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 522 tx->tx_head, skb->len, tx->qp->qp_num); 523 524 /* 525 * We put the skb into the tx_ring _before_ we call post_send() 526 * because it's entirely possible that the completion handler will 527 * run before we execute anything after the post_send(). That 528 * means we have to make sure everything is properly recorded and 529 * our state is consistent before we call post_send(). 530 */ 531 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 532 tx_req->skb = skb; 533 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 534 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 535 ++dev->stats.tx_errors; 536 dev_kfree_skb_any(skb); 537 return; 538 } 539 540 tx_req->mapping = addr; 541 542 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 543 addr, skb->len))) { 544 ipoib_warn(priv, "post_send failed\n"); 545 ++dev->stats.tx_errors; 546 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 547 dev_kfree_skb_any(skb); 548 } else { 549 dev->trans_start = jiffies; 550 ++tx->tx_head; 551 552 if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) { 553 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 554 tx->qp->qp_num); 555 netif_stop_queue(dev); 556 set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags); 557 } 558 } 559 } 560 561 static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx, 562 struct ib_wc *wc) 563 { 564 struct ipoib_dev_priv *priv = netdev_priv(dev); 565 unsigned int wr_id = wc->wr_id; 566 struct ipoib_tx_buf *tx_req; 567 unsigned long flags; 568 569 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 570 wr_id, wc->status); 571 572 if (unlikely(wr_id >= ipoib_sendq_size)) { 573 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 574 wr_id, ipoib_sendq_size); 575 return; 576 } 577 578 tx_req = &tx->tx_ring[wr_id]; 579 580 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 581 582 /* FIXME: is this right? Shouldn't we only increment on success? */ 583 ++dev->stats.tx_packets; 584 dev->stats.tx_bytes += tx_req->skb->len; 585 586 dev_kfree_skb_any(tx_req->skb); 587 588 spin_lock_irqsave(&priv->tx_lock, flags); 589 ++tx->tx_tail; 590 if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) && 591 tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) { 592 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags); 593 netif_wake_queue(dev); 594 } 595 596 if (wc->status != IB_WC_SUCCESS && 597 wc->status != IB_WC_WR_FLUSH_ERR) { 598 struct ipoib_neigh *neigh; 599 600 ipoib_dbg(priv, "failed cm send event " 601 "(status=%d, wrid=%d vend_err %x)\n", 602 wc->status, wr_id, wc->vendor_err); 603 604 spin_lock(&priv->lock); 605 neigh = tx->neigh; 606 607 if (neigh) { 608 neigh->cm = NULL; 609 list_del(&neigh->list); 610 if (neigh->ah) 611 ipoib_put_ah(neigh->ah); 612 ipoib_neigh_free(dev, neigh); 613 614 tx->neigh = NULL; 615 } 616 617 /* queue would be re-started anyway when TX is destroyed, 618 * but it makes sense to do it ASAP here. */ 619 if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) 620 netif_wake_queue(dev); 621 622 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 623 list_move(&tx->list, &priv->cm.reap_list); 624 queue_work(ipoib_workqueue, &priv->cm.reap_task); 625 } 626 627 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 628 629 spin_unlock(&priv->lock); 630 } 631 632 spin_unlock_irqrestore(&priv->tx_lock, flags); 633 } 634 635 static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr) 636 { 637 struct ipoib_cm_tx *tx = tx_ptr; 638 int n, i; 639 640 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 641 do { 642 n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc); 643 for (i = 0; i < n; ++i) 644 ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i); 645 } while (n == IPOIB_NUM_WC); 646 } 647 648 int ipoib_cm_dev_open(struct net_device *dev) 649 { 650 struct ipoib_dev_priv *priv = netdev_priv(dev); 651 int ret; 652 653 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 654 return 0; 655 656 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 657 if (IS_ERR(priv->cm.id)) { 658 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 659 ret = PTR_ERR(priv->cm.id); 660 goto err_cm; 661 } 662 663 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 664 0, NULL); 665 if (ret) { 666 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 667 IPOIB_CM_IETF_ID | priv->qp->qp_num); 668 goto err_listen; 669 } 670 671 return 0; 672 673 err_listen: 674 ib_destroy_cm_id(priv->cm.id); 675 err_cm: 676 priv->cm.id = NULL; 677 return ret; 678 } 679 680 void ipoib_cm_dev_stop(struct net_device *dev) 681 { 682 struct ipoib_dev_priv *priv = netdev_priv(dev); 683 struct ipoib_cm_rx *p, *n; 684 unsigned long begin; 685 LIST_HEAD(list); 686 int ret; 687 688 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 689 return; 690 691 ib_destroy_cm_id(priv->cm.id); 692 priv->cm.id = NULL; 693 694 spin_lock_irq(&priv->lock); 695 while (!list_empty(&priv->cm.passive_ids)) { 696 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 697 list_move(&p->list, &priv->cm.rx_error_list); 698 p->state = IPOIB_CM_RX_ERROR; 699 spin_unlock_irq(&priv->lock); 700 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 701 if (ret) 702 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 703 spin_lock_irq(&priv->lock); 704 } 705 706 /* Wait for all RX to be drained */ 707 begin = jiffies; 708 709 while (!list_empty(&priv->cm.rx_error_list) || 710 !list_empty(&priv->cm.rx_flush_list) || 711 !list_empty(&priv->cm.rx_drain_list)) { 712 if (time_after(jiffies, begin + 5 * HZ)) { 713 ipoib_warn(priv, "RX drain timing out\n"); 714 715 /* 716 * assume the HW is wedged and just free up everything. 717 */ 718 list_splice_init(&priv->cm.rx_flush_list, &list); 719 list_splice_init(&priv->cm.rx_error_list, &list); 720 list_splice_init(&priv->cm.rx_drain_list, &list); 721 break; 722 } 723 spin_unlock_irq(&priv->lock); 724 msleep(1); 725 ipoib_drain_cq(dev); 726 spin_lock_irq(&priv->lock); 727 } 728 729 list_splice_init(&priv->cm.rx_reap_list, &list); 730 731 spin_unlock_irq(&priv->lock); 732 733 list_for_each_entry_safe(p, n, &list, list) { 734 ib_destroy_cm_id(p->id); 735 ib_destroy_qp(p->qp); 736 kfree(p); 737 } 738 739 cancel_delayed_work(&priv->cm.stale_task); 740 } 741 742 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 743 { 744 struct ipoib_cm_tx *p = cm_id->context; 745 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 746 struct ipoib_cm_data *data = event->private_data; 747 struct sk_buff_head skqueue; 748 struct ib_qp_attr qp_attr; 749 int qp_attr_mask, ret; 750 struct sk_buff *skb; 751 752 p->mtu = be32_to_cpu(data->mtu); 753 754 if (p->mtu <= IPOIB_ENCAP_LEN) { 755 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 756 p->mtu, IPOIB_ENCAP_LEN); 757 return -EINVAL; 758 } 759 760 qp_attr.qp_state = IB_QPS_RTR; 761 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 762 if (ret) { 763 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 764 return ret; 765 } 766 767 qp_attr.rq_psn = 0 /* FIXME */; 768 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 769 if (ret) { 770 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 771 return ret; 772 } 773 774 qp_attr.qp_state = IB_QPS_RTS; 775 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 776 if (ret) { 777 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 778 return ret; 779 } 780 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 781 if (ret) { 782 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 783 return ret; 784 } 785 786 skb_queue_head_init(&skqueue); 787 788 spin_lock_irq(&priv->lock); 789 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 790 if (p->neigh) 791 while ((skb = __skb_dequeue(&p->neigh->queue))) 792 __skb_queue_tail(&skqueue, skb); 793 spin_unlock_irq(&priv->lock); 794 795 while ((skb = __skb_dequeue(&skqueue))) { 796 skb->dev = p->dev; 797 if (dev_queue_xmit(skb)) 798 ipoib_warn(priv, "dev_queue_xmit failed " 799 "to requeue packet\n"); 800 } 801 802 ret = ib_send_cm_rtu(cm_id, NULL, 0); 803 if (ret) { 804 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 805 return ret; 806 } 807 return 0; 808 } 809 810 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq) 811 { 812 struct ipoib_dev_priv *priv = netdev_priv(dev); 813 struct ib_qp_init_attr attr = { 814 .send_cq = cq, 815 .recv_cq = priv->cq, 816 .srq = priv->cm.srq, 817 .cap.max_send_wr = ipoib_sendq_size, 818 .cap.max_send_sge = 1, 819 .sq_sig_type = IB_SIGNAL_ALL_WR, 820 .qp_type = IB_QPT_RC, 821 }; 822 823 return ib_create_qp(priv->pd, &attr); 824 } 825 826 static int ipoib_cm_send_req(struct net_device *dev, 827 struct ib_cm_id *id, struct ib_qp *qp, 828 u32 qpn, 829 struct ib_sa_path_rec *pathrec) 830 { 831 struct ipoib_dev_priv *priv = netdev_priv(dev); 832 struct ipoib_cm_data data = {}; 833 struct ib_cm_req_param req = {}; 834 835 data.qpn = cpu_to_be32(priv->qp->qp_num); 836 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 837 838 req.primary_path = pathrec; 839 req.alternate_path = NULL; 840 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 841 req.qp_num = qp->qp_num; 842 req.qp_type = qp->qp_type; 843 req.private_data = &data; 844 req.private_data_len = sizeof data; 845 req.flow_control = 0; 846 847 req.starting_psn = 0; /* FIXME */ 848 849 /* 850 * Pick some arbitrary defaults here; we could make these 851 * module parameters if anyone cared about setting them. 852 */ 853 req.responder_resources = 4; 854 req.remote_cm_response_timeout = 20; 855 req.local_cm_response_timeout = 20; 856 req.retry_count = 0; /* RFC draft warns against retries */ 857 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 858 req.max_cm_retries = 15; 859 req.srq = 1; 860 return ib_send_cm_req(id, &req); 861 } 862 863 static int ipoib_cm_modify_tx_init(struct net_device *dev, 864 struct ib_cm_id *cm_id, struct ib_qp *qp) 865 { 866 struct ipoib_dev_priv *priv = netdev_priv(dev); 867 struct ib_qp_attr qp_attr; 868 int qp_attr_mask, ret; 869 ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 870 if (ret) { 871 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret); 872 return ret; 873 } 874 875 qp_attr.qp_state = IB_QPS_INIT; 876 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 877 qp_attr.port_num = priv->port; 878 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 879 880 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 881 if (ret) { 882 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 883 return ret; 884 } 885 return 0; 886 } 887 888 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 889 struct ib_sa_path_rec *pathrec) 890 { 891 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 892 int ret; 893 894 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, 895 GFP_KERNEL); 896 if (!p->tx_ring) { 897 ipoib_warn(priv, "failed to allocate tx ring\n"); 898 ret = -ENOMEM; 899 goto err_tx; 900 } 901 902 p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p, 903 ipoib_sendq_size + 1, 0); 904 if (IS_ERR(p->cq)) { 905 ret = PTR_ERR(p->cq); 906 ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret); 907 goto err_cq; 908 } 909 910 ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP); 911 if (ret) { 912 ipoib_warn(priv, "failed to request completion notification: %d\n", ret); 913 goto err_req_notify; 914 } 915 916 p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq); 917 if (IS_ERR(p->qp)) { 918 ret = PTR_ERR(p->qp); 919 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 920 goto err_qp; 921 } 922 923 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 924 if (IS_ERR(p->id)) { 925 ret = PTR_ERR(p->id); 926 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 927 goto err_id; 928 } 929 930 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 931 if (ret) { 932 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 933 goto err_modify; 934 } 935 936 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 937 if (ret) { 938 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 939 goto err_send_cm; 940 } 941 942 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n", 943 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn); 944 945 return 0; 946 947 err_send_cm: 948 err_modify: 949 ib_destroy_cm_id(p->id); 950 err_id: 951 p->id = NULL; 952 ib_destroy_qp(p->qp); 953 err_req_notify: 954 err_qp: 955 p->qp = NULL; 956 ib_destroy_cq(p->cq); 957 err_cq: 958 p->cq = NULL; 959 err_tx: 960 return ret; 961 } 962 963 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 964 { 965 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 966 struct ipoib_tx_buf *tx_req; 967 968 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 969 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 970 971 if (p->id) 972 ib_destroy_cm_id(p->id); 973 974 if (p->qp) 975 ib_destroy_qp(p->qp); 976 977 if (p->cq) 978 ib_destroy_cq(p->cq); 979 980 if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags)) 981 netif_wake_queue(p->dev); 982 983 if (p->tx_ring) { 984 while ((int) p->tx_tail - (int) p->tx_head < 0) { 985 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 986 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 987 DMA_TO_DEVICE); 988 dev_kfree_skb_any(tx_req->skb); 989 ++p->tx_tail; 990 } 991 992 kfree(p->tx_ring); 993 } 994 995 kfree(p); 996 } 997 998 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 999 struct ib_cm_event *event) 1000 { 1001 struct ipoib_cm_tx *tx = cm_id->context; 1002 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1003 struct net_device *dev = priv->dev; 1004 struct ipoib_neigh *neigh; 1005 int ret; 1006 1007 switch (event->event) { 1008 case IB_CM_DREQ_RECEIVED: 1009 ipoib_dbg(priv, "DREQ received.\n"); 1010 ib_send_cm_drep(cm_id, NULL, 0); 1011 break; 1012 case IB_CM_REP_RECEIVED: 1013 ipoib_dbg(priv, "REP received.\n"); 1014 ret = ipoib_cm_rep_handler(cm_id, event); 1015 if (ret) 1016 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1017 NULL, 0, NULL, 0); 1018 break; 1019 case IB_CM_REQ_ERROR: 1020 case IB_CM_REJ_RECEIVED: 1021 case IB_CM_TIMEWAIT_EXIT: 1022 ipoib_dbg(priv, "CM error %d.\n", event->event); 1023 spin_lock_irq(&priv->tx_lock); 1024 spin_lock(&priv->lock); 1025 neigh = tx->neigh; 1026 1027 if (neigh) { 1028 neigh->cm = NULL; 1029 list_del(&neigh->list); 1030 if (neigh->ah) 1031 ipoib_put_ah(neigh->ah); 1032 ipoib_neigh_free(dev, neigh); 1033 1034 tx->neigh = NULL; 1035 } 1036 1037 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1038 list_move(&tx->list, &priv->cm.reap_list); 1039 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1040 } 1041 1042 spin_unlock(&priv->lock); 1043 spin_unlock_irq(&priv->tx_lock); 1044 break; 1045 default: 1046 break; 1047 } 1048 1049 return 0; 1050 } 1051 1052 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1053 struct ipoib_neigh *neigh) 1054 { 1055 struct ipoib_dev_priv *priv = netdev_priv(dev); 1056 struct ipoib_cm_tx *tx; 1057 1058 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1059 if (!tx) 1060 return NULL; 1061 1062 neigh->cm = tx; 1063 tx->neigh = neigh; 1064 tx->path = path; 1065 tx->dev = dev; 1066 list_add(&tx->list, &priv->cm.start_list); 1067 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1068 queue_work(ipoib_workqueue, &priv->cm.start_task); 1069 return tx; 1070 } 1071 1072 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1073 { 1074 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1075 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1076 list_move(&tx->list, &priv->cm.reap_list); 1077 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1078 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n", 1079 IPOIB_GID_ARG(tx->neigh->dgid)); 1080 tx->neigh = NULL; 1081 } 1082 } 1083 1084 static void ipoib_cm_tx_start(struct work_struct *work) 1085 { 1086 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1087 cm.start_task); 1088 struct net_device *dev = priv->dev; 1089 struct ipoib_neigh *neigh; 1090 struct ipoib_cm_tx *p; 1091 unsigned long flags; 1092 int ret; 1093 1094 struct ib_sa_path_rec pathrec; 1095 u32 qpn; 1096 1097 spin_lock_irqsave(&priv->tx_lock, flags); 1098 spin_lock(&priv->lock); 1099 while (!list_empty(&priv->cm.start_list)) { 1100 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1101 list_del_init(&p->list); 1102 neigh = p->neigh; 1103 qpn = IPOIB_QPN(neigh->neighbour->ha); 1104 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1105 spin_unlock(&priv->lock); 1106 spin_unlock_irqrestore(&priv->tx_lock, flags); 1107 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1108 spin_lock_irqsave(&priv->tx_lock, flags); 1109 spin_lock(&priv->lock); 1110 if (ret) { 1111 neigh = p->neigh; 1112 if (neigh) { 1113 neigh->cm = NULL; 1114 list_del(&neigh->list); 1115 if (neigh->ah) 1116 ipoib_put_ah(neigh->ah); 1117 ipoib_neigh_free(dev, neigh); 1118 } 1119 list_del(&p->list); 1120 kfree(p); 1121 } 1122 } 1123 spin_unlock(&priv->lock); 1124 spin_unlock_irqrestore(&priv->tx_lock, flags); 1125 } 1126 1127 static void ipoib_cm_tx_reap(struct work_struct *work) 1128 { 1129 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1130 cm.reap_task); 1131 struct ipoib_cm_tx *p; 1132 1133 spin_lock_irq(&priv->tx_lock); 1134 spin_lock(&priv->lock); 1135 while (!list_empty(&priv->cm.reap_list)) { 1136 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1137 list_del(&p->list); 1138 spin_unlock(&priv->lock); 1139 spin_unlock_irq(&priv->tx_lock); 1140 ipoib_cm_tx_destroy(p); 1141 spin_lock_irq(&priv->tx_lock); 1142 spin_lock(&priv->lock); 1143 } 1144 spin_unlock(&priv->lock); 1145 spin_unlock_irq(&priv->tx_lock); 1146 } 1147 1148 static void ipoib_cm_skb_reap(struct work_struct *work) 1149 { 1150 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1151 cm.skb_task); 1152 struct sk_buff *skb; 1153 1154 unsigned mtu = priv->mcast_mtu; 1155 1156 spin_lock_irq(&priv->tx_lock); 1157 spin_lock(&priv->lock); 1158 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1159 spin_unlock(&priv->lock); 1160 spin_unlock_irq(&priv->tx_lock); 1161 if (skb->protocol == htons(ETH_P_IP)) 1162 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1163 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1164 else if (skb->protocol == htons(ETH_P_IPV6)) 1165 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev); 1166 #endif 1167 dev_kfree_skb_any(skb); 1168 spin_lock_irq(&priv->tx_lock); 1169 spin_lock(&priv->lock); 1170 } 1171 spin_unlock(&priv->lock); 1172 spin_unlock_irq(&priv->tx_lock); 1173 } 1174 1175 void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb, 1176 unsigned int mtu) 1177 { 1178 struct ipoib_dev_priv *priv = netdev_priv(dev); 1179 int e = skb_queue_empty(&priv->cm.skb_queue); 1180 1181 if (skb->dst) 1182 skb->dst->ops->update_pmtu(skb->dst, mtu); 1183 1184 skb_queue_tail(&priv->cm.skb_queue, skb); 1185 if (e) 1186 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1187 } 1188 1189 static void ipoib_cm_rx_reap(struct work_struct *work) 1190 { 1191 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1192 cm.rx_reap_task); 1193 struct ipoib_cm_rx *p, *n; 1194 LIST_HEAD(list); 1195 1196 spin_lock_irq(&priv->lock); 1197 list_splice_init(&priv->cm.rx_reap_list, &list); 1198 spin_unlock_irq(&priv->lock); 1199 1200 list_for_each_entry_safe(p, n, &list, list) { 1201 ib_destroy_cm_id(p->id); 1202 ib_destroy_qp(p->qp); 1203 kfree(p); 1204 } 1205 } 1206 1207 static void ipoib_cm_stale_task(struct work_struct *work) 1208 { 1209 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1210 cm.stale_task.work); 1211 struct ipoib_cm_rx *p; 1212 int ret; 1213 1214 spin_lock_irq(&priv->lock); 1215 while (!list_empty(&priv->cm.passive_ids)) { 1216 /* List is sorted by LRU, start from tail, 1217 * stop when we see a recently used entry */ 1218 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1219 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1220 break; 1221 list_move(&p->list, &priv->cm.rx_error_list); 1222 p->state = IPOIB_CM_RX_ERROR; 1223 spin_unlock_irq(&priv->lock); 1224 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1225 if (ret) 1226 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1227 spin_lock_irq(&priv->lock); 1228 } 1229 1230 if (!list_empty(&priv->cm.passive_ids)) 1231 queue_delayed_work(ipoib_workqueue, 1232 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1233 spin_unlock_irq(&priv->lock); 1234 } 1235 1236 1237 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1238 char *buf) 1239 { 1240 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1241 1242 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1243 return sprintf(buf, "connected\n"); 1244 else 1245 return sprintf(buf, "datagram\n"); 1246 } 1247 1248 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1249 const char *buf, size_t count) 1250 { 1251 struct net_device *dev = to_net_dev(d); 1252 struct ipoib_dev_priv *priv = netdev_priv(dev); 1253 1254 /* flush paths if we switch modes so that connections are restarted */ 1255 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 1256 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1257 ipoib_warn(priv, "enabling connected mode " 1258 "will cause multicast packet drops\n"); 1259 ipoib_flush_paths(dev); 1260 return count; 1261 } 1262 1263 if (!strcmp(buf, "datagram\n")) { 1264 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1265 dev->mtu = min(priv->mcast_mtu, dev->mtu); 1266 ipoib_flush_paths(dev); 1267 return count; 1268 } 1269 1270 return -EINVAL; 1271 } 1272 1273 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1274 1275 int ipoib_cm_add_mode_attr(struct net_device *dev) 1276 { 1277 return device_create_file(&dev->dev, &dev_attr_mode); 1278 } 1279 1280 int ipoib_cm_dev_init(struct net_device *dev) 1281 { 1282 struct ipoib_dev_priv *priv = netdev_priv(dev); 1283 struct ib_srq_init_attr srq_init_attr = { 1284 .attr = { 1285 .max_wr = ipoib_recvq_size, 1286 .max_sge = IPOIB_CM_RX_SG 1287 } 1288 }; 1289 int ret, i; 1290 1291 INIT_LIST_HEAD(&priv->cm.passive_ids); 1292 INIT_LIST_HEAD(&priv->cm.reap_list); 1293 INIT_LIST_HEAD(&priv->cm.start_list); 1294 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1295 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1296 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1297 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1298 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1299 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1300 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1301 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1302 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1303 1304 skb_queue_head_init(&priv->cm.skb_queue); 1305 1306 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1307 if (IS_ERR(priv->cm.srq)) { 1308 ret = PTR_ERR(priv->cm.srq); 1309 priv->cm.srq = NULL; 1310 return ret; 1311 } 1312 1313 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, 1314 GFP_KERNEL); 1315 if (!priv->cm.srq_ring) { 1316 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n", 1317 priv->ca->name, ipoib_recvq_size); 1318 ipoib_cm_dev_cleanup(dev); 1319 return -ENOMEM; 1320 } 1321 1322 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 1323 priv->cm.rx_sge[i].lkey = priv->mr->lkey; 1324 1325 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE; 1326 for (i = 1; i < IPOIB_CM_RX_SG; ++i) 1327 priv->cm.rx_sge[i].length = PAGE_SIZE; 1328 priv->cm.rx_wr.next = NULL; 1329 priv->cm.rx_wr.sg_list = priv->cm.rx_sge; 1330 priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG; 1331 1332 for (i = 0; i < ipoib_recvq_size; ++i) { 1333 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1, 1334 priv->cm.srq_ring[i].mapping)) { 1335 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 1336 ipoib_cm_dev_cleanup(dev); 1337 return -ENOMEM; 1338 } 1339 if (ipoib_cm_post_receive(dev, i)) { 1340 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 1341 ipoib_cm_dev_cleanup(dev); 1342 return -EIO; 1343 } 1344 } 1345 1346 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1347 return 0; 1348 } 1349 1350 void ipoib_cm_dev_cleanup(struct net_device *dev) 1351 { 1352 struct ipoib_dev_priv *priv = netdev_priv(dev); 1353 int i, ret; 1354 1355 if (!priv->cm.srq) 1356 return; 1357 1358 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1359 1360 ret = ib_destroy_srq(priv->cm.srq); 1361 if (ret) 1362 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1363 1364 priv->cm.srq = NULL; 1365 if (!priv->cm.srq_ring) 1366 return; 1367 for (i = 0; i < ipoib_recvq_size; ++i) 1368 if (priv->cm.srq_ring[i].skb) { 1369 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 1370 priv->cm.srq_ring[i].mapping); 1371 dev_kfree_skb_any(priv->cm.srq_ring[i].skb); 1372 priv->cm.srq_ring[i].skb = NULL; 1373 } 1374 kfree(priv->cm.srq_ring); 1375 priv->cm.srq_ring = NULL; 1376 } 1377