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 skb->truesize = SKB_TRUESIZE(skb->len); 249 250 ++dev->stats.rx_packets; 251 dev->stats.rx_bytes += skb->len; 252 253 skb->dev = dev; 254 if ((dev->features & NETIF_F_RXCSUM) && 255 likely(wc->wc_flags & IB_WC_IP_CSUM_OK)) 256 skb->ip_summed = CHECKSUM_UNNECESSARY; 257 258 napi_gro_receive(&priv->napi, skb); 259 260 repost: 261 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 262 ipoib_warn(priv, "ipoib_ib_post_receive failed " 263 "for buf %d\n", wr_id); 264 } 265 266 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req) 267 { 268 struct sk_buff *skb = tx_req->skb; 269 u64 *mapping = tx_req->mapping; 270 int i; 271 int off; 272 273 if (skb_headlen(skb)) { 274 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 275 DMA_TO_DEVICE); 276 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 277 return -EIO; 278 279 off = 1; 280 } else 281 off = 0; 282 283 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 284 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 285 mapping[i + off] = ib_dma_map_page(ca, 286 skb_frag_page(frag), 287 frag->page_offset, skb_frag_size(frag), 288 DMA_TO_DEVICE); 289 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 290 goto partial_error; 291 } 292 return 0; 293 294 partial_error: 295 for (; i > 0; --i) { 296 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 297 298 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); 299 } 300 301 if (off) 302 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 303 304 return -EIO; 305 } 306 307 void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv, 308 struct ipoib_tx_buf *tx_req) 309 { 310 struct sk_buff *skb = tx_req->skb; 311 u64 *mapping = tx_req->mapping; 312 int i; 313 int off; 314 315 if (skb_headlen(skb)) { 316 ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb), 317 DMA_TO_DEVICE); 318 off = 1; 319 } else 320 off = 0; 321 322 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 323 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 324 325 ib_dma_unmap_page(priv->ca, mapping[i + off], 326 skb_frag_size(frag), DMA_TO_DEVICE); 327 } 328 } 329 330 /* 331 * As the result of a completion error the QP Can be transferred to SQE states. 332 * The function checks if the (send)QP is in SQE state and 333 * moves it back to RTS state, that in order to have it functional again. 334 */ 335 static void ipoib_qp_state_validate_work(struct work_struct *work) 336 { 337 struct ipoib_qp_state_validate *qp_work = 338 container_of(work, struct ipoib_qp_state_validate, work); 339 340 struct ipoib_dev_priv *priv = qp_work->priv; 341 struct ib_qp_attr qp_attr; 342 struct ib_qp_init_attr query_init_attr; 343 int ret; 344 345 ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr); 346 if (ret) { 347 ipoib_warn(priv, "%s: Failed to query QP ret: %d\n", 348 __func__, ret); 349 goto free_res; 350 } 351 pr_info("%s: QP: 0x%x is in state: %d\n", 352 __func__, priv->qp->qp_num, qp_attr.qp_state); 353 354 /* currently support only in SQE->RTS transition*/ 355 if (qp_attr.qp_state == IB_QPS_SQE) { 356 qp_attr.qp_state = IB_QPS_RTS; 357 358 ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE); 359 if (ret) { 360 pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n", 361 ret, priv->qp->qp_num); 362 goto free_res; 363 } 364 pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n", 365 __func__, priv->qp->qp_num); 366 } else { 367 pr_warn("QP (%d) will stay in state: %d\n", 368 priv->qp->qp_num, qp_attr.qp_state); 369 } 370 371 free_res: 372 kfree(qp_work); 373 } 374 375 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 376 { 377 struct ipoib_dev_priv *priv = netdev_priv(dev); 378 unsigned int wr_id = wc->wr_id; 379 struct ipoib_tx_buf *tx_req; 380 381 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 382 wr_id, wc->status); 383 384 if (unlikely(wr_id >= ipoib_sendq_size)) { 385 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 386 wr_id, ipoib_sendq_size); 387 return; 388 } 389 390 tx_req = &priv->tx_ring[wr_id]; 391 392 ipoib_dma_unmap_tx(priv, tx_req); 393 394 ++dev->stats.tx_packets; 395 dev->stats.tx_bytes += tx_req->skb->len; 396 397 dev_kfree_skb_any(tx_req->skb); 398 399 ++priv->tx_tail; 400 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 401 netif_queue_stopped(dev) && 402 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 403 netif_wake_queue(dev); 404 405 if (wc->status != IB_WC_SUCCESS && 406 wc->status != IB_WC_WR_FLUSH_ERR) { 407 struct ipoib_qp_state_validate *qp_work; 408 ipoib_warn(priv, "failed send event " 409 "(status=%d, wrid=%d vend_err %x)\n", 410 wc->status, wr_id, wc->vendor_err); 411 qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC); 412 if (!qp_work) { 413 ipoib_warn(priv, "%s Failed alloc ipoib_qp_state_validate for qp: 0x%x\n", 414 __func__, priv->qp->qp_num); 415 return; 416 } 417 418 INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work); 419 qp_work->priv = priv; 420 queue_work(priv->wq, &qp_work->work); 421 } 422 } 423 424 static int poll_tx(struct ipoib_dev_priv *priv) 425 { 426 int n, i; 427 428 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 429 for (i = 0; i < n; ++i) 430 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 431 432 return n == MAX_SEND_CQE; 433 } 434 435 int ipoib_poll(struct napi_struct *napi, int budget) 436 { 437 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 438 struct net_device *dev = priv->dev; 439 int done; 440 int t; 441 int n, i; 442 443 done = 0; 444 445 poll_more: 446 while (done < budget) { 447 int max = (budget - done); 448 449 t = min(IPOIB_NUM_WC, max); 450 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 451 452 for (i = 0; i < n; i++) { 453 struct ib_wc *wc = priv->ibwc + i; 454 455 if (wc->wr_id & IPOIB_OP_RECV) { 456 ++done; 457 if (wc->wr_id & IPOIB_OP_CM) 458 ipoib_cm_handle_rx_wc(dev, wc); 459 else 460 ipoib_ib_handle_rx_wc(dev, wc); 461 } else 462 ipoib_cm_handle_tx_wc(priv->dev, wc); 463 } 464 465 if (n != t) 466 break; 467 } 468 469 if (done < budget) { 470 napi_complete(napi); 471 if (unlikely(ib_req_notify_cq(priv->recv_cq, 472 IB_CQ_NEXT_COMP | 473 IB_CQ_REPORT_MISSED_EVENTS)) && 474 napi_reschedule(napi)) 475 goto poll_more; 476 } 477 478 return done; 479 } 480 481 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 482 { 483 struct net_device *dev = dev_ptr; 484 struct ipoib_dev_priv *priv = netdev_priv(dev); 485 486 napi_schedule(&priv->napi); 487 } 488 489 static void drain_tx_cq(struct net_device *dev) 490 { 491 struct ipoib_dev_priv *priv = netdev_priv(dev); 492 493 netif_tx_lock(dev); 494 while (poll_tx(priv)) 495 ; /* nothing */ 496 497 if (netif_queue_stopped(dev)) 498 mod_timer(&priv->poll_timer, jiffies + 1); 499 500 netif_tx_unlock(dev); 501 } 502 503 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 504 { 505 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 506 507 mod_timer(&priv->poll_timer, jiffies); 508 } 509 510 static inline int post_send(struct ipoib_dev_priv *priv, 511 unsigned int wr_id, 512 struct ib_ah *address, u32 qpn, 513 struct ipoib_tx_buf *tx_req, 514 void *head, int hlen) 515 { 516 struct ib_send_wr *bad_wr; 517 struct sk_buff *skb = tx_req->skb; 518 519 ipoib_build_sge(priv, tx_req); 520 521 priv->tx_wr.wr_id = wr_id; 522 priv->tx_wr.wr.ud.remote_qpn = qpn; 523 priv->tx_wr.wr.ud.ah = address; 524 525 if (head) { 526 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size; 527 priv->tx_wr.wr.ud.header = head; 528 priv->tx_wr.wr.ud.hlen = hlen; 529 priv->tx_wr.opcode = IB_WR_LSO; 530 } else 531 priv->tx_wr.opcode = IB_WR_SEND; 532 533 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 534 } 535 536 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 537 struct ipoib_ah *address, u32 qpn) 538 { 539 struct ipoib_dev_priv *priv = netdev_priv(dev); 540 struct ipoib_tx_buf *tx_req; 541 int hlen, rc; 542 void *phead; 543 544 if (skb_is_gso(skb)) { 545 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 546 phead = skb->data; 547 if (unlikely(!skb_pull(skb, hlen))) { 548 ipoib_warn(priv, "linear data too small\n"); 549 ++dev->stats.tx_dropped; 550 ++dev->stats.tx_errors; 551 dev_kfree_skb_any(skb); 552 return; 553 } 554 } else { 555 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 556 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 557 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 558 ++dev->stats.tx_dropped; 559 ++dev->stats.tx_errors; 560 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 561 return; 562 } 563 phead = NULL; 564 hlen = 0; 565 } 566 567 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 568 skb->len, address, qpn); 569 570 /* 571 * We put the skb into the tx_ring _before_ we call post_send() 572 * because it's entirely possible that the completion handler will 573 * run before we execute anything after the post_send(). That 574 * means we have to make sure everything is properly recorded and 575 * our state is consistent before we call post_send(). 576 */ 577 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 578 tx_req->skb = skb; 579 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 580 ++dev->stats.tx_errors; 581 dev_kfree_skb_any(skb); 582 return; 583 } 584 585 if (skb->ip_summed == CHECKSUM_PARTIAL) 586 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM; 587 else 588 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 589 590 if (++priv->tx_outstanding == ipoib_sendq_size) { 591 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 592 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 593 ipoib_warn(priv, "request notify on send CQ failed\n"); 594 netif_stop_queue(dev); 595 } 596 597 skb_orphan(skb); 598 skb_dst_drop(skb); 599 600 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 601 address->ah, qpn, tx_req, phead, hlen); 602 if (unlikely(rc)) { 603 ipoib_warn(priv, "post_send failed, error %d\n", rc); 604 ++dev->stats.tx_errors; 605 --priv->tx_outstanding; 606 ipoib_dma_unmap_tx(priv, tx_req); 607 dev_kfree_skb_any(skb); 608 if (netif_queue_stopped(dev)) 609 netif_wake_queue(dev); 610 } else { 611 dev->trans_start = jiffies; 612 613 address->last_send = priv->tx_head; 614 ++priv->tx_head; 615 } 616 617 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 618 while (poll_tx(priv)) 619 ; /* nothing */ 620 } 621 622 static void __ipoib_reap_ah(struct net_device *dev) 623 { 624 struct ipoib_dev_priv *priv = netdev_priv(dev); 625 struct ipoib_ah *ah, *tah; 626 LIST_HEAD(remove_list); 627 unsigned long flags; 628 629 netif_tx_lock_bh(dev); 630 spin_lock_irqsave(&priv->lock, flags); 631 632 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 633 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 634 list_del(&ah->list); 635 ib_destroy_ah(ah->ah); 636 kfree(ah); 637 } 638 639 spin_unlock_irqrestore(&priv->lock, flags); 640 netif_tx_unlock_bh(dev); 641 } 642 643 void ipoib_reap_ah(struct work_struct *work) 644 { 645 struct ipoib_dev_priv *priv = 646 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 647 struct net_device *dev = priv->dev; 648 649 __ipoib_reap_ah(dev); 650 651 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 652 queue_delayed_work(priv->wq, &priv->ah_reap_task, 653 round_jiffies_relative(HZ)); 654 } 655 656 static void ipoib_flush_ah(struct net_device *dev) 657 { 658 struct ipoib_dev_priv *priv = netdev_priv(dev); 659 660 cancel_delayed_work(&priv->ah_reap_task); 661 flush_workqueue(priv->wq); 662 ipoib_reap_ah(&priv->ah_reap_task.work); 663 } 664 665 static void ipoib_stop_ah(struct net_device *dev) 666 { 667 struct ipoib_dev_priv *priv = netdev_priv(dev); 668 669 set_bit(IPOIB_STOP_REAPER, &priv->flags); 670 ipoib_flush_ah(dev); 671 } 672 673 static void ipoib_ib_tx_timer_func(unsigned long ctx) 674 { 675 drain_tx_cq((struct net_device *)ctx); 676 } 677 678 int ipoib_ib_dev_open(struct net_device *dev) 679 { 680 struct ipoib_dev_priv *priv = netdev_priv(dev); 681 int ret; 682 683 ipoib_pkey_dev_check_presence(dev); 684 685 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 686 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, 687 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); 688 return -1; 689 } 690 691 ret = ipoib_init_qp(dev); 692 if (ret) { 693 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 694 return -1; 695 } 696 697 ret = ipoib_ib_post_receives(dev); 698 if (ret) { 699 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 700 goto dev_stop; 701 } 702 703 ret = ipoib_cm_dev_open(dev); 704 if (ret) { 705 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 706 goto dev_stop; 707 } 708 709 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 710 queue_delayed_work(priv->wq, &priv->ah_reap_task, 711 round_jiffies_relative(HZ)); 712 713 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 714 napi_enable(&priv->napi); 715 716 return 0; 717 dev_stop: 718 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 719 napi_enable(&priv->napi); 720 ipoib_ib_dev_stop(dev); 721 return -1; 722 } 723 724 void ipoib_pkey_dev_check_presence(struct net_device *dev) 725 { 726 struct ipoib_dev_priv *priv = netdev_priv(dev); 727 728 if (!(priv->pkey & 0x7fff) || 729 ib_find_pkey(priv->ca, priv->port, priv->pkey, 730 &priv->pkey_index)) 731 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 732 else 733 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 734 } 735 736 int ipoib_ib_dev_up(struct net_device *dev) 737 { 738 struct ipoib_dev_priv *priv = netdev_priv(dev); 739 740 ipoib_pkey_dev_check_presence(dev); 741 742 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 743 ipoib_dbg(priv, "PKEY is not assigned.\n"); 744 return 0; 745 } 746 747 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 748 749 return ipoib_mcast_start_thread(dev); 750 } 751 752 int ipoib_ib_dev_down(struct net_device *dev) 753 { 754 struct ipoib_dev_priv *priv = netdev_priv(dev); 755 756 ipoib_dbg(priv, "downing ib_dev\n"); 757 758 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 759 netif_carrier_off(dev); 760 761 ipoib_mcast_stop_thread(dev); 762 ipoib_mcast_dev_flush(dev); 763 764 ipoib_flush_paths(dev); 765 766 return 0; 767 } 768 769 static int recvs_pending(struct net_device *dev) 770 { 771 struct ipoib_dev_priv *priv = netdev_priv(dev); 772 int pending = 0; 773 int i; 774 775 for (i = 0; i < ipoib_recvq_size; ++i) 776 if (priv->rx_ring[i].skb) 777 ++pending; 778 779 return pending; 780 } 781 782 void ipoib_drain_cq(struct net_device *dev) 783 { 784 struct ipoib_dev_priv *priv = netdev_priv(dev); 785 int i, n; 786 787 /* 788 * We call completion handling routines that expect to be 789 * called from the BH-disabled NAPI poll context, so disable 790 * BHs here too. 791 */ 792 local_bh_disable(); 793 794 do { 795 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 796 for (i = 0; i < n; ++i) { 797 /* 798 * Convert any successful completions to flush 799 * errors to avoid passing packets up the 800 * stack after bringing the device down. 801 */ 802 if (priv->ibwc[i].status == IB_WC_SUCCESS) 803 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 804 805 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 806 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 807 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 808 else 809 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 810 } else 811 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 812 } 813 } while (n == IPOIB_NUM_WC); 814 815 while (poll_tx(priv)) 816 ; /* nothing */ 817 818 local_bh_enable(); 819 } 820 821 int ipoib_ib_dev_stop(struct net_device *dev) 822 { 823 struct ipoib_dev_priv *priv = netdev_priv(dev); 824 struct ib_qp_attr qp_attr; 825 unsigned long begin; 826 struct ipoib_tx_buf *tx_req; 827 int i; 828 829 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 830 napi_disable(&priv->napi); 831 832 ipoib_cm_dev_stop(dev); 833 834 /* 835 * Move our QP to the error state and then reinitialize in 836 * when all work requests have completed or have been flushed. 837 */ 838 qp_attr.qp_state = IB_QPS_ERR; 839 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 840 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 841 842 /* Wait for all sends and receives to complete */ 843 begin = jiffies; 844 845 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 846 if (time_after(jiffies, begin + 5 * HZ)) { 847 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 848 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 849 850 /* 851 * assume the HW is wedged and just free up 852 * all our pending work requests. 853 */ 854 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 855 tx_req = &priv->tx_ring[priv->tx_tail & 856 (ipoib_sendq_size - 1)]; 857 ipoib_dma_unmap_tx(priv, tx_req); 858 dev_kfree_skb_any(tx_req->skb); 859 ++priv->tx_tail; 860 --priv->tx_outstanding; 861 } 862 863 for (i = 0; i < ipoib_recvq_size; ++i) { 864 struct ipoib_rx_buf *rx_req; 865 866 rx_req = &priv->rx_ring[i]; 867 if (!rx_req->skb) 868 continue; 869 ipoib_ud_dma_unmap_rx(priv, 870 priv->rx_ring[i].mapping); 871 dev_kfree_skb_any(rx_req->skb); 872 rx_req->skb = NULL; 873 } 874 875 goto timeout; 876 } 877 878 ipoib_drain_cq(dev); 879 880 msleep(1); 881 } 882 883 ipoib_dbg(priv, "All sends and receives done.\n"); 884 885 timeout: 886 del_timer_sync(&priv->poll_timer); 887 qp_attr.qp_state = IB_QPS_RESET; 888 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 889 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 890 891 ipoib_flush_ah(dev); 892 893 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 894 895 return 0; 896 } 897 898 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 899 { 900 struct ipoib_dev_priv *priv = netdev_priv(dev); 901 902 priv->ca = ca; 903 priv->port = port; 904 priv->qp = NULL; 905 906 if (ipoib_transport_dev_init(dev, ca)) { 907 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 908 return -ENODEV; 909 } 910 911 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 912 (unsigned long) dev); 913 914 if (dev->flags & IFF_UP) { 915 if (ipoib_ib_dev_open(dev)) { 916 ipoib_transport_dev_cleanup(dev); 917 return -ENODEV; 918 } 919 } 920 921 return 0; 922 } 923 924 /* 925 * Takes whatever value which is in pkey index 0 and updates priv->pkey 926 * returns 0 if the pkey value was changed. 927 */ 928 static inline int update_parent_pkey(struct ipoib_dev_priv *priv) 929 { 930 int result; 931 u16 prev_pkey; 932 933 prev_pkey = priv->pkey; 934 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 935 if (result) { 936 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n", 937 priv->port, result); 938 return result; 939 } 940 941 priv->pkey |= 0x8000; 942 943 if (prev_pkey != priv->pkey) { 944 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n", 945 prev_pkey, priv->pkey); 946 /* 947 * Update the pkey in the broadcast address, while making sure to set 948 * the full membership bit, so that we join the right broadcast group. 949 */ 950 priv->dev->broadcast[8] = priv->pkey >> 8; 951 priv->dev->broadcast[9] = priv->pkey & 0xff; 952 return 0; 953 } 954 955 return 1; 956 } 957 /* 958 * returns 0 if pkey value was found in a different slot. 959 */ 960 static inline int update_child_pkey(struct ipoib_dev_priv *priv) 961 { 962 u16 old_index = priv->pkey_index; 963 964 priv->pkey_index = 0; 965 ipoib_pkey_dev_check_presence(priv->dev); 966 967 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 968 (old_index == priv->pkey_index)) 969 return 1; 970 return 0; 971 } 972 973 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 974 enum ipoib_flush_level level, 975 int nesting) 976 { 977 struct ipoib_dev_priv *cpriv; 978 struct net_device *dev = priv->dev; 979 int result; 980 981 down_read_nested(&priv->vlan_rwsem, nesting); 982 983 /* 984 * Flush any child interfaces too -- they might be up even if 985 * the parent is down. 986 */ 987 list_for_each_entry(cpriv, &priv->child_intfs, list) 988 __ipoib_ib_dev_flush(cpriv, level, nesting + 1); 989 990 up_read(&priv->vlan_rwsem); 991 992 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && 993 level != IPOIB_FLUSH_HEAVY) { 994 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 995 return; 996 } 997 998 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 999 /* interface is down. update pkey and leave. */ 1000 if (level == IPOIB_FLUSH_HEAVY) { 1001 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1002 update_parent_pkey(priv); 1003 else 1004 update_child_pkey(priv); 1005 } 1006 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 1007 return; 1008 } 1009 1010 if (level == IPOIB_FLUSH_HEAVY) { 1011 /* child devices chase their origin pkey value, while non-child 1012 * (parent) devices should always takes what present in pkey index 0 1013 */ 1014 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 1015 result = update_child_pkey(priv); 1016 if (result) { 1017 /* restart QP only if P_Key index is changed */ 1018 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 1019 return; 1020 } 1021 1022 } else { 1023 result = update_parent_pkey(priv); 1024 /* restart QP only if P_Key value changed */ 1025 if (result) { 1026 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n"); 1027 return; 1028 } 1029 } 1030 } 1031 1032 if (level == IPOIB_FLUSH_LIGHT) { 1033 ipoib_mark_paths_invalid(dev); 1034 ipoib_mcast_dev_flush(dev); 1035 ipoib_flush_ah(dev); 1036 } 1037 1038 if (level >= IPOIB_FLUSH_NORMAL) 1039 ipoib_ib_dev_down(dev); 1040 1041 if (level == IPOIB_FLUSH_HEAVY) { 1042 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 1043 ipoib_ib_dev_stop(dev); 1044 if (ipoib_ib_dev_open(dev) != 0) 1045 return; 1046 if (netif_queue_stopped(dev)) 1047 netif_start_queue(dev); 1048 } 1049 1050 /* 1051 * The device could have been brought down between the start and when 1052 * we get here, don't bring it back up if it's not configured up 1053 */ 1054 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1055 if (level >= IPOIB_FLUSH_NORMAL) 1056 ipoib_ib_dev_up(dev); 1057 ipoib_mcast_restart_task(&priv->restart_task); 1058 } 1059 } 1060 1061 void ipoib_ib_dev_flush_light(struct work_struct *work) 1062 { 1063 struct ipoib_dev_priv *priv = 1064 container_of(work, struct ipoib_dev_priv, flush_light); 1065 1066 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0); 1067 } 1068 1069 void ipoib_ib_dev_flush_normal(struct work_struct *work) 1070 { 1071 struct ipoib_dev_priv *priv = 1072 container_of(work, struct ipoib_dev_priv, flush_normal); 1073 1074 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0); 1075 } 1076 1077 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1078 { 1079 struct ipoib_dev_priv *priv = 1080 container_of(work, struct ipoib_dev_priv, flush_heavy); 1081 1082 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0); 1083 } 1084 1085 void ipoib_ib_dev_cleanup(struct net_device *dev) 1086 { 1087 struct ipoib_dev_priv *priv = netdev_priv(dev); 1088 1089 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1090 /* 1091 * We must make sure there are no more (path) completions 1092 * that may wish to touch priv fields that are no longer valid 1093 */ 1094 ipoib_flush_paths(dev); 1095 1096 ipoib_mcast_stop_thread(dev); 1097 ipoib_mcast_dev_flush(dev); 1098 1099 /* 1100 * All of our ah references aren't free until after 1101 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and 1102 * the neighbor garbage collection is stopped and reaped. 1103 * That should all be done now, so make a final ah flush. 1104 */ 1105 ipoib_stop_ah(dev); 1106 1107 ipoib_transport_dev_cleanup(dev); 1108 } 1109 1110 1111