1 /* 2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #include <linux/delay.h> 37 #include <linux/moduleparam.h> 38 #include <linux/dma-mapping.h> 39 #include <linux/slab.h> 40 41 #include <linux/ip.h> 42 #include <linux/tcp.h> 43 44 #include "ipoib.h" 45 46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 47 static int data_debug_level; 48 49 module_param(data_debug_level, int, 0644); 50 MODULE_PARM_DESC(data_debug_level, 51 "Enable data path debug tracing if > 0"); 52 #endif 53 54 static DEFINE_MUTEX(pkey_mutex); 55 56 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 57 struct ib_pd *pd, struct ib_ah_attr *attr) 58 { 59 struct ipoib_ah *ah; 60 struct ib_ah *vah; 61 62 ah = kmalloc(sizeof *ah, GFP_KERNEL); 63 if (!ah) 64 return ERR_PTR(-ENOMEM); 65 66 ah->dev = dev; 67 ah->last_send = 0; 68 kref_init(&ah->ref); 69 70 vah = ib_create_ah(pd, attr); 71 if (IS_ERR(vah)) { 72 kfree(ah); 73 ah = (struct ipoib_ah *)vah; 74 } else { 75 ah->ah = vah; 76 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 77 } 78 79 return ah; 80 } 81 82 void ipoib_free_ah(struct kref *kref) 83 { 84 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 85 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 86 87 unsigned long flags; 88 89 spin_lock_irqsave(&priv->lock, flags); 90 list_add_tail(&ah->list, &priv->dead_ahs); 91 spin_unlock_irqrestore(&priv->lock, flags); 92 } 93 94 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, 95 u64 mapping[IPOIB_UD_RX_SG]) 96 { 97 ib_dma_unmap_single(priv->ca, mapping[0], 98 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), 99 DMA_FROM_DEVICE); 100 } 101 102 static int ipoib_ib_post_receive(struct net_device *dev, int id) 103 { 104 struct ipoib_dev_priv *priv = netdev_priv(dev); 105 struct ib_recv_wr *bad_wr; 106 int ret; 107 108 priv->rx_wr.wr_id = id | IPOIB_OP_RECV; 109 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; 110 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; 111 112 113 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr); 114 if (unlikely(ret)) { 115 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 116 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); 117 dev_kfree_skb_any(priv->rx_ring[id].skb); 118 priv->rx_ring[id].skb = NULL; 119 } 120 121 return ret; 122 } 123 124 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) 125 { 126 struct ipoib_dev_priv *priv = netdev_priv(dev); 127 struct sk_buff *skb; 128 int buf_size; 129 u64 *mapping; 130 131 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 132 133 skb = dev_alloc_skb(buf_size + IPOIB_ENCAP_LEN); 134 if (unlikely(!skb)) 135 return NULL; 136 137 /* 138 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 139 * header. So we need 4 more bytes to get to 48 and align the 140 * IP header to a multiple of 16. 141 */ 142 skb_reserve(skb, 4); 143 144 mapping = priv->rx_ring[id].mapping; 145 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 146 DMA_FROM_DEVICE); 147 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 148 goto error; 149 150 priv->rx_ring[id].skb = skb; 151 return skb; 152 error: 153 dev_kfree_skb_any(skb); 154 return NULL; 155 } 156 157 static int ipoib_ib_post_receives(struct net_device *dev) 158 { 159 struct ipoib_dev_priv *priv = netdev_priv(dev); 160 int i; 161 162 for (i = 0; i < ipoib_recvq_size; ++i) { 163 if (!ipoib_alloc_rx_skb(dev, i)) { 164 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 165 return -ENOMEM; 166 } 167 if (ipoib_ib_post_receive(dev, i)) { 168 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 169 return -EIO; 170 } 171 } 172 173 return 0; 174 } 175 176 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 177 { 178 struct ipoib_dev_priv *priv = netdev_priv(dev); 179 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 180 struct sk_buff *skb; 181 u64 mapping[IPOIB_UD_RX_SG]; 182 union ib_gid *dgid; 183 184 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 185 wr_id, wc->status); 186 187 if (unlikely(wr_id >= ipoib_recvq_size)) { 188 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 189 wr_id, ipoib_recvq_size); 190 return; 191 } 192 193 skb = priv->rx_ring[wr_id].skb; 194 195 if (unlikely(wc->status != IB_WC_SUCCESS)) { 196 if (wc->status != IB_WC_WR_FLUSH_ERR) 197 ipoib_warn(priv, "failed recv event " 198 "(status=%d, wrid=%d vend_err %x)\n", 199 wc->status, wr_id, wc->vendor_err); 200 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 201 dev_kfree_skb_any(skb); 202 priv->rx_ring[wr_id].skb = NULL; 203 return; 204 } 205 206 /* 207 * Drop packets that this interface sent, ie multicast packets 208 * that the HCA has replicated. 209 */ 210 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 211 goto repost; 212 213 memcpy(mapping, priv->rx_ring[wr_id].mapping, 214 IPOIB_UD_RX_SG * sizeof *mapping); 215 216 /* 217 * If we can't allocate a new RX buffer, dump 218 * this packet and reuse the old buffer. 219 */ 220 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 221 ++dev->stats.rx_dropped; 222 goto repost; 223 } 224 225 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 226 wc->byte_len, wc->slid); 227 228 ipoib_ud_dma_unmap_rx(priv, mapping); 229 230 skb_put(skb, wc->byte_len); 231 232 /* First byte of dgid signals multicast when 0xff */ 233 dgid = &((struct ib_grh *)skb->data)->dgid; 234 235 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff) 236 skb->pkt_type = PACKET_HOST; 237 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0) 238 skb->pkt_type = PACKET_BROADCAST; 239 else 240 skb->pkt_type = PACKET_MULTICAST; 241 242 skb_pull(skb, IB_GRH_BYTES); 243 244 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 245 skb_reset_mac_header(skb); 246 skb_pull(skb, IPOIB_ENCAP_LEN); 247 248 ++dev->stats.rx_packets; 249 dev->stats.rx_bytes += skb->len; 250 251 skb->dev = dev; 252 if ((dev->features & NETIF_F_RXCSUM) && 253 likely(wc->wc_flags & IB_WC_IP_CSUM_OK)) 254 skb->ip_summed = CHECKSUM_UNNECESSARY; 255 256 napi_gro_receive(&priv->napi, skb); 257 258 repost: 259 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 260 ipoib_warn(priv, "ipoib_ib_post_receive failed " 261 "for buf %d\n", wr_id); 262 } 263 264 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req) 265 { 266 struct sk_buff *skb = tx_req->skb; 267 u64 *mapping = tx_req->mapping; 268 int i; 269 int off; 270 271 if (skb_headlen(skb)) { 272 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 273 DMA_TO_DEVICE); 274 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 275 return -EIO; 276 277 off = 1; 278 } else 279 off = 0; 280 281 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 282 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 283 mapping[i + off] = ib_dma_map_page(ca, 284 skb_frag_page(frag), 285 frag->page_offset, skb_frag_size(frag), 286 DMA_TO_DEVICE); 287 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 288 goto partial_error; 289 } 290 return 0; 291 292 partial_error: 293 for (; i > 0; --i) { 294 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 295 296 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); 297 } 298 299 if (off) 300 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 301 302 return -EIO; 303 } 304 305 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv, 306 struct ipoib_tx_buf *tx_req) 307 { 308 struct sk_buff *skb = tx_req->skb; 309 u64 *mapping = tx_req->mapping; 310 int i; 311 int off; 312 313 if (skb_headlen(skb)) { 314 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb), 315 DMA_TO_DEVICE); 316 off = 1; 317 } else 318 off = 0; 319 320 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 321 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 322 323 ib_dma_unmap_page(priv->ca, mapping[i + off], 324 skb_frag_size(frag), DMA_TO_DEVICE); 325 } 326 } 327 328 /* 329 * As the result of a completion error the QP Can be transferred to SQE states. 330 * The function checks if the (send)QP is in SQE state and 331 * moves it back to RTS state, that in order to have it functional again. 332 */ 333 static void ipoib_qp_state_validate_work(struct work_struct *work) 334 { 335 struct ipoib_qp_state_validate *qp_work = 336 container_of(work, struct ipoib_qp_state_validate, work); 337 338 struct ipoib_dev_priv *priv = qp_work->priv; 339 struct ib_qp_attr qp_attr; 340 struct ib_qp_init_attr query_init_attr; 341 int ret; 342 343 ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr); 344 if (ret) { 345 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n", 346 __func__, ret); 347 goto free_res; 348 } 349 pr_info("%s: QP: 0x%x is in state: %d\n", 350 __func__, priv->qp->qp_num, qp_attr.qp_state); 351 352 /* currently support only in SQE->RTS transition*/ 353 if (qp_attr.qp_state == IB_QPS_SQE) { 354 qp_attr.qp_state = IB_QPS_RTS; 355 356 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE); 357 if (ret) { 358 pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n", 359 ret, priv->qp->qp_num); 360 goto free_res; 361 } 362 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n", 363 __func__, priv->qp->qp_num); 364 } else { 365 pr_warn("QP (%d) will stay in state: %d\n", 366 priv->qp->qp_num, qp_attr.qp_state); 367 } 368 369 free_res: 370 kfree(qp_work); 371 } 372 373 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 374 { 375 struct ipoib_dev_priv *priv = netdev_priv(dev); 376 unsigned int wr_id = wc->wr_id; 377 struct ipoib_tx_buf *tx_req; 378 379 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 380 wr_id, wc->status); 381 382 if (unlikely(wr_id >= ipoib_sendq_size)) { 383 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 384 wr_id, ipoib_sendq_size); 385 return; 386 } 387 388 tx_req = &priv->tx_ring[wr_id]; 389 390 ipoib_dma_unmap_tx(priv, tx_req); 391 392 ++dev->stats.tx_packets; 393 dev->stats.tx_bytes += tx_req->skb->len; 394 395 dev_kfree_skb_any(tx_req->skb); 396 397 ++priv->tx_tail; 398 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 399 netif_queue_stopped(dev) && 400 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 401 netif_wake_queue(dev); 402 403 if (wc->status != IB_WC_SUCCESS && 404 wc->status != IB_WC_WR_FLUSH_ERR) { 405 struct ipoib_qp_state_validate *qp_work; 406 ipoib_warn(priv, "failed send event " 407 "(status=%d, wrid=%d vend_err %x)\n", 408 wc->status, wr_id, wc->vendor_err); 409 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC); 410 if (!qp_work) { 411 ipoib_warn(priv, "%s Failed alloc ipoib_qp_state_validate for qp: 0x%x\n", 412 __func__, priv->qp->qp_num); 413 return; 414 } 415 416 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work); 417 qp_work->priv = priv; 418 queue_work(priv->wq, &qp_work->work); 419 } 420 } 421 422 static int poll_tx(struct ipoib_dev_priv *priv) 423 { 424 int n, i; 425 426 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 427 for (i = 0; i < n; ++i) 428 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 429 430 return n == MAX_SEND_CQE; 431 } 432 433 int ipoib_poll(struct napi_struct *napi, int budget) 434 { 435 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 436 struct net_device *dev = priv->dev; 437 int done; 438 int t; 439 int n, i; 440 441 done = 0; 442 443 poll_more: 444 while (done < budget) { 445 int max = (budget - done); 446 447 t = min(IPOIB_NUM_WC, max); 448 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 449 450 for (i = 0; i < n; i++) { 451 struct ib_wc *wc = priv->ibwc + i; 452 453 if (wc->wr_id & IPOIB_OP_RECV) { 454 ++done; 455 if (wc->wr_id & IPOIB_OP_CM) 456 ipoib_cm_handle_rx_wc(dev, wc); 457 else 458 ipoib_ib_handle_rx_wc(dev, wc); 459 } else 460 ipoib_cm_handle_tx_wc(priv->dev, wc); 461 } 462 463 if (n != t) 464 break; 465 } 466 467 if (done < budget) { 468 napi_complete(napi); 469 if (unlikely(ib_req_notify_cq(priv->recv_cq, 470 IB_CQ_NEXT_COMP | 471 IB_CQ_REPORT_MISSED_EVENTS)) && 472 napi_reschedule(napi)) 473 goto poll_more; 474 } 475 476 return done; 477 } 478 479 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 480 { 481 struct net_device *dev = dev_ptr; 482 struct ipoib_dev_priv *priv = netdev_priv(dev); 483 484 napi_schedule(&priv->napi); 485 } 486 487 static void drain_tx_cq(struct net_device *dev) 488 { 489 struct ipoib_dev_priv *priv = netdev_priv(dev); 490 491 netif_tx_lock(dev); 492 while (poll_tx(priv)) 493 ; /* nothing */ 494 495 if (netif_queue_stopped(dev)) 496 mod_timer(&priv->poll_timer, jiffies + 1); 497 498 netif_tx_unlock(dev); 499 } 500 501 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 502 { 503 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 504 505 mod_timer(&priv->poll_timer, jiffies); 506 } 507 508 static inline int post_send(struct ipoib_dev_priv *priv, 509 unsigned int wr_id, 510 struct ib_ah *address, u32 qpn, 511 struct ipoib_tx_buf *tx_req, 512 void *head, int hlen) 513 { 514 struct ib_send_wr *bad_wr; 515 struct sk_buff *skb = tx_req->skb; 516 517 ipoib_build_sge(priv, tx_req); 518 519 priv->tx_wr.wr.wr_id = wr_id; 520 priv->tx_wr.remote_qpn = qpn; 521 priv->tx_wr.ah = address; 522 523 if (head) { 524 priv->tx_wr.mss = skb_shinfo(skb)->gso_size; 525 priv->tx_wr.header = head; 526 priv->tx_wr.hlen = hlen; 527 priv->tx_wr.wr.opcode = IB_WR_LSO; 528 } else 529 priv->tx_wr.wr.opcode = IB_WR_SEND; 530 531 return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr); 532 } 533 534 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 535 struct ipoib_ah *address, u32 qpn) 536 { 537 struct ipoib_dev_priv *priv = netdev_priv(dev); 538 struct ipoib_tx_buf *tx_req; 539 int hlen, rc; 540 void *phead; 541 542 if (skb_is_gso(skb)) { 543 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 544 phead = skb->data; 545 if (unlikely(!skb_pull(skb, hlen))) { 546 ipoib_warn(priv, "linear data too small\n"); 547 ++dev->stats.tx_dropped; 548 ++dev->stats.tx_errors; 549 dev_kfree_skb_any(skb); 550 return; 551 } 552 } else { 553 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 554 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 555 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 556 ++dev->stats.tx_dropped; 557 ++dev->stats.tx_errors; 558 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 559 return; 560 } 561 phead = NULL; 562 hlen = 0; 563 } 564 565 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 566 skb->len, address, qpn); 567 568 /* 569 * We put the skb into the tx_ring _before_ we call post_send() 570 * because it's entirely possible that the completion handler will 571 * run before we execute anything after the post_send(). That 572 * means we have to make sure everything is properly recorded and 573 * our state is consistent before we call post_send(). 574 */ 575 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 576 tx_req->skb = skb; 577 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 578 ++dev->stats.tx_errors; 579 dev_kfree_skb_any(skb); 580 return; 581 } 582 583 if (skb->ip_summed == CHECKSUM_PARTIAL) 584 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM; 585 else 586 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; 587 588 if (++priv->tx_outstanding == ipoib_sendq_size) { 589 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 590 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 591 ipoib_warn(priv, "request notify on send CQ failed\n"); 592 netif_stop_queue(dev); 593 } 594 595 skb_orphan(skb); 596 skb_dst_drop(skb); 597 598 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 599 address->ah, qpn, tx_req, phead, hlen); 600 if (unlikely(rc)) { 601 ipoib_warn(priv, "post_send failed, error %d\n", rc); 602 ++dev->stats.tx_errors; 603 --priv->tx_outstanding; 604 ipoib_dma_unmap_tx(priv, tx_req); 605 dev_kfree_skb_any(skb); 606 if (netif_queue_stopped(dev)) 607 netif_wake_queue(dev); 608 } else { 609 dev->trans_start = jiffies; 610 611 address->last_send = priv->tx_head; 612 ++priv->tx_head; 613 } 614 615 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 616 while (poll_tx(priv)) 617 ; /* nothing */ 618 } 619 620 static void __ipoib_reap_ah(struct net_device *dev) 621 { 622 struct ipoib_dev_priv *priv = netdev_priv(dev); 623 struct ipoib_ah *ah, *tah; 624 LIST_HEAD(remove_list); 625 unsigned long flags; 626 627 netif_tx_lock_bh(dev); 628 spin_lock_irqsave(&priv->lock, flags); 629 630 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 631 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 632 list_del(&ah->list); 633 ib_destroy_ah(ah->ah); 634 kfree(ah); 635 } 636 637 spin_unlock_irqrestore(&priv->lock, flags); 638 netif_tx_unlock_bh(dev); 639 } 640 641 void ipoib_reap_ah(struct work_struct *work) 642 { 643 struct ipoib_dev_priv *priv = 644 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 645 struct net_device *dev = priv->dev; 646 647 __ipoib_reap_ah(dev); 648 649 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 650 queue_delayed_work(priv->wq, &priv->ah_reap_task, 651 round_jiffies_relative(HZ)); 652 } 653 654 static void ipoib_flush_ah(struct net_device *dev) 655 { 656 struct ipoib_dev_priv *priv = netdev_priv(dev); 657 658 cancel_delayed_work(&priv->ah_reap_task); 659 flush_workqueue(priv->wq); 660 ipoib_reap_ah(&priv->ah_reap_task.work); 661 } 662 663 static void ipoib_stop_ah(struct net_device *dev) 664 { 665 struct ipoib_dev_priv *priv = netdev_priv(dev); 666 667 set_bit(IPOIB_STOP_REAPER, &priv->flags); 668 ipoib_flush_ah(dev); 669 } 670 671 static void ipoib_ib_tx_timer_func(unsigned long ctx) 672 { 673 drain_tx_cq((struct net_device *)ctx); 674 } 675 676 int ipoib_ib_dev_open(struct net_device *dev) 677 { 678 struct ipoib_dev_priv *priv = netdev_priv(dev); 679 int ret; 680 681 ipoib_pkey_dev_check_presence(dev); 682 683 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 684 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, 685 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); 686 return -1; 687 } 688 689 ret = ipoib_init_qp(dev); 690 if (ret) { 691 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 692 return -1; 693 } 694 695 ret = ipoib_ib_post_receives(dev); 696 if (ret) { 697 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 698 goto dev_stop; 699 } 700 701 ret = ipoib_cm_dev_open(dev); 702 if (ret) { 703 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 704 goto dev_stop; 705 } 706 707 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 708 queue_delayed_work(priv->wq, &priv->ah_reap_task, 709 round_jiffies_relative(HZ)); 710 711 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 712 napi_enable(&priv->napi); 713 714 return 0; 715 dev_stop: 716 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 717 napi_enable(&priv->napi); 718 ipoib_ib_dev_stop(dev); 719 return -1; 720 } 721 722 void ipoib_pkey_dev_check_presence(struct net_device *dev) 723 { 724 struct ipoib_dev_priv *priv = netdev_priv(dev); 725 726 if (!(priv->pkey & 0x7fff) || 727 ib_find_pkey(priv->ca, priv->port, priv->pkey, 728 &priv->pkey_index)) 729 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 730 else 731 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 732 } 733 734 int ipoib_ib_dev_up(struct net_device *dev) 735 { 736 struct ipoib_dev_priv *priv = netdev_priv(dev); 737 738 ipoib_pkey_dev_check_presence(dev); 739 740 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 741 ipoib_dbg(priv, "PKEY is not assigned.\n"); 742 return 0; 743 } 744 745 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 746 747 return ipoib_mcast_start_thread(dev); 748 } 749 750 int ipoib_ib_dev_down(struct net_device *dev) 751 { 752 struct ipoib_dev_priv *priv = netdev_priv(dev); 753 754 ipoib_dbg(priv, "downing ib_dev\n"); 755 756 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 757 netif_carrier_off(dev); 758 759 ipoib_mcast_stop_thread(dev); 760 ipoib_mcast_dev_flush(dev); 761 762 ipoib_flush_paths(dev); 763 764 return 0; 765 } 766 767 static int recvs_pending(struct net_device *dev) 768 { 769 struct ipoib_dev_priv *priv = netdev_priv(dev); 770 int pending = 0; 771 int i; 772 773 for (i = 0; i < ipoib_recvq_size; ++i) 774 if (priv->rx_ring[i].skb) 775 ++pending; 776 777 return pending; 778 } 779 780 void ipoib_drain_cq(struct net_device *dev) 781 { 782 struct ipoib_dev_priv *priv = netdev_priv(dev); 783 int i, n; 784 785 /* 786 * We call completion handling routines that expect to be 787 * called from the BH-disabled NAPI poll context, so disable 788 * BHs here too. 789 */ 790 local_bh_disable(); 791 792 do { 793 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 794 for (i = 0; i < n; ++i) { 795 /* 796 * Convert any successful completions to flush 797 * errors to avoid passing packets up the 798 * stack after bringing the device down. 799 */ 800 if (priv->ibwc[i].status == IB_WC_SUCCESS) 801 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 802 803 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 804 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 805 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 806 else 807 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 808 } else 809 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 810 } 811 } while (n == IPOIB_NUM_WC); 812 813 while (poll_tx(priv)) 814 ; /* nothing */ 815 816 local_bh_enable(); 817 } 818 819 int ipoib_ib_dev_stop(struct net_device *dev) 820 { 821 struct ipoib_dev_priv *priv = netdev_priv(dev); 822 struct ib_qp_attr qp_attr; 823 unsigned long begin; 824 struct ipoib_tx_buf *tx_req; 825 int i; 826 827 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 828 napi_disable(&priv->napi); 829 830 ipoib_cm_dev_stop(dev); 831 832 /* 833 * Move our QP to the error state and then reinitialize in 834 * when all work requests have completed or have been flushed. 835 */ 836 qp_attr.qp_state = IB_QPS_ERR; 837 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 838 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 839 840 /* Wait for all sends and receives to complete */ 841 begin = jiffies; 842 843 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 844 if (time_after(jiffies, begin + 5 * HZ)) { 845 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 846 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 847 848 /* 849 * assume the HW is wedged and just free up 850 * all our pending work requests. 851 */ 852 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 853 tx_req = &priv->tx_ring[priv->tx_tail & 854 (ipoib_sendq_size - 1)]; 855 ipoib_dma_unmap_tx(priv, tx_req); 856 dev_kfree_skb_any(tx_req->skb); 857 ++priv->tx_tail; 858 --priv->tx_outstanding; 859 } 860 861 for (i = 0; i < ipoib_recvq_size; ++i) { 862 struct ipoib_rx_buf *rx_req; 863 864 rx_req = &priv->rx_ring[i]; 865 if (!rx_req->skb) 866 continue; 867 ipoib_ud_dma_unmap_rx(priv, 868 priv->rx_ring[i].mapping); 869 dev_kfree_skb_any(rx_req->skb); 870 rx_req->skb = NULL; 871 } 872 873 goto timeout; 874 } 875 876 ipoib_drain_cq(dev); 877 878 msleep(1); 879 } 880 881 ipoib_dbg(priv, "All sends and receives done.\n"); 882 883 timeout: 884 del_timer_sync(&priv->poll_timer); 885 qp_attr.qp_state = IB_QPS_RESET; 886 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 887 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 888 889 ipoib_flush_ah(dev); 890 891 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 892 893 return 0; 894 } 895 896 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 897 { 898 struct ipoib_dev_priv *priv = netdev_priv(dev); 899 900 priv->ca = ca; 901 priv->port = port; 902 priv->qp = NULL; 903 904 if (ipoib_transport_dev_init(dev, ca)) { 905 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 906 return -ENODEV; 907 } 908 909 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 910 (unsigned long) dev); 911 912 if (dev->flags & IFF_UP) { 913 if (ipoib_ib_dev_open(dev)) { 914 ipoib_transport_dev_cleanup(dev); 915 return -ENODEV; 916 } 917 } 918 919 return 0; 920 } 921 922 /* 923 * Takes whatever value which is in pkey index 0 and updates priv->pkey 924 * returns 0 if the pkey value was changed. 925 */ 926 static inline int update_parent_pkey(struct ipoib_dev_priv *priv) 927 { 928 int result; 929 u16 prev_pkey; 930 931 prev_pkey = priv->pkey; 932 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 933 if (result) { 934 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n", 935 priv->port, result); 936 return result; 937 } 938 939 priv->pkey |= 0x8000; 940 941 if (prev_pkey != priv->pkey) { 942 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n", 943 prev_pkey, priv->pkey); 944 /* 945 * Update the pkey in the broadcast address, while making sure to set 946 * the full membership bit, so that we join the right broadcast group. 947 */ 948 priv->dev->broadcast[8] = priv->pkey >> 8; 949 priv->dev->broadcast[9] = priv->pkey & 0xff; 950 return 0; 951 } 952 953 return 1; 954 } 955 /* 956 * returns 0 if pkey value was found in a different slot. 957 */ 958 static inline int update_child_pkey(struct ipoib_dev_priv *priv) 959 { 960 u16 old_index = priv->pkey_index; 961 962 priv->pkey_index = 0; 963 ipoib_pkey_dev_check_presence(priv->dev); 964 965 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 966 (old_index == priv->pkey_index)) 967 return 1; 968 return 0; 969 } 970 971 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 972 enum ipoib_flush_level level, 973 int nesting) 974 { 975 struct ipoib_dev_priv *cpriv; 976 struct net_device *dev = priv->dev; 977 int result; 978 979 down_read_nested(&priv->vlan_rwsem, nesting); 980 981 /* 982 * Flush any child interfaces too -- they might be up even if 983 * the parent is down. 984 */ 985 list_for_each_entry(cpriv, &priv->child_intfs, list) 986 __ipoib_ib_dev_flush(cpriv, level, nesting + 1); 987 988 up_read(&priv->vlan_rwsem); 989 990 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && 991 level != IPOIB_FLUSH_HEAVY) { 992 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 993 return; 994 } 995 996 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 997 /* interface is down. update pkey and leave. */ 998 if (level == IPOIB_FLUSH_HEAVY) { 999 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1000 update_parent_pkey(priv); 1001 else 1002 update_child_pkey(priv); 1003 } 1004 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 1005 return; 1006 } 1007 1008 if (level == IPOIB_FLUSH_HEAVY) { 1009 /* child devices chase their origin pkey value, while non-child 1010 * (parent) devices should always takes what present in pkey index 0 1011 */ 1012 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 1013 result = update_child_pkey(priv); 1014 if (result) { 1015 /* restart QP only if P_Key index is changed */ 1016 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 1017 return; 1018 } 1019 1020 } else { 1021 result = update_parent_pkey(priv); 1022 /* restart QP only if P_Key value changed */ 1023 if (result) { 1024 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n"); 1025 return; 1026 } 1027 } 1028 } 1029 1030 if (level == IPOIB_FLUSH_LIGHT) { 1031 ipoib_mark_paths_invalid(dev); 1032 ipoib_mcast_dev_flush(dev); 1033 ipoib_flush_ah(dev); 1034 } 1035 1036 if (level >= IPOIB_FLUSH_NORMAL) 1037 ipoib_ib_dev_down(dev); 1038 1039 if (level == IPOIB_FLUSH_HEAVY) { 1040 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 1041 ipoib_ib_dev_stop(dev); 1042 if (ipoib_ib_dev_open(dev) != 0) 1043 return; 1044 if (netif_queue_stopped(dev)) 1045 netif_start_queue(dev); 1046 } 1047 1048 /* 1049 * The device could have been brought down between the start and when 1050 * we get here, don't bring it back up if it's not configured up 1051 */ 1052 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1053 if (level >= IPOIB_FLUSH_NORMAL) 1054 ipoib_ib_dev_up(dev); 1055 ipoib_mcast_restart_task(&priv->restart_task); 1056 } 1057 } 1058 1059 void ipoib_ib_dev_flush_light(struct work_struct *work) 1060 { 1061 struct ipoib_dev_priv *priv = 1062 container_of(work, struct ipoib_dev_priv, flush_light); 1063 1064 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0); 1065 } 1066 1067 void ipoib_ib_dev_flush_normal(struct work_struct *work) 1068 { 1069 struct ipoib_dev_priv *priv = 1070 container_of(work, struct ipoib_dev_priv, flush_normal); 1071 1072 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0); 1073 } 1074 1075 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1076 { 1077 struct ipoib_dev_priv *priv = 1078 container_of(work, struct ipoib_dev_priv, flush_heavy); 1079 1080 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0); 1081 } 1082 1083 void ipoib_ib_dev_cleanup(struct net_device *dev) 1084 { 1085 struct ipoib_dev_priv *priv = netdev_priv(dev); 1086 1087 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1088 /* 1089 * We must make sure there are no more (path) completions 1090 * that may wish to touch priv fields that are no longer valid 1091 */ 1092 ipoib_flush_paths(dev); 1093 1094 ipoib_mcast_stop_thread(dev); 1095 ipoib_mcast_dev_flush(dev); 1096 1097 /* 1098 * All of our ah references aren't free until after 1099 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and 1100 * the neighbor garbage collection is stopped and reaped. 1101 * That should all be done now, so make a final ah flush. 1102 */ 1103 ipoib_stop_ah(dev); 1104 1105 ipoib_transport_dev_cleanup(dev); 1106 } 1107 1108 1109