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/dma-mapping.h> 38 #include <linux/slab.h> 39 40 #include <linux/ip.h> 41 #include <linux/tcp.h> 42 43 #include "ipoib.h" 44 45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 46 static int data_debug_level; 47 48 module_param(data_debug_level, int, 0644); 49 MODULE_PARM_DESC(data_debug_level, 50 "Enable data path debug tracing if > 0"); 51 #endif 52 53 static DEFINE_MUTEX(pkey_mutex); 54 55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 56 struct ib_pd *pd, struct ib_ah_attr *attr) 57 { 58 struct ipoib_ah *ah; 59 60 ah = kmalloc(sizeof *ah, GFP_KERNEL); 61 if (!ah) 62 return NULL; 63 64 ah->dev = dev; 65 ah->last_send = 0; 66 kref_init(&ah->ref); 67 68 ah->ah = ib_create_ah(pd, attr); 69 if (IS_ERR(ah->ah)) { 70 kfree(ah); 71 ah = NULL; 72 } else 73 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 74 75 return ah; 76 } 77 78 void ipoib_free_ah(struct kref *kref) 79 { 80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 81 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 82 83 unsigned long flags; 84 85 spin_lock_irqsave(&priv->lock, flags); 86 list_add_tail(&ah->list, &priv->dead_ahs); 87 spin_unlock_irqrestore(&priv->lock, flags); 88 } 89 90 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, 91 u64 mapping[IPOIB_UD_RX_SG]) 92 { 93 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 94 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE, 95 DMA_FROM_DEVICE); 96 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE, 97 DMA_FROM_DEVICE); 98 } else 99 ib_dma_unmap_single(priv->ca, mapping[0], 100 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), 101 DMA_FROM_DEVICE); 102 } 103 104 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv, 105 struct sk_buff *skb, 106 unsigned int length) 107 { 108 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 109 skb_frag_t *frag = &skb_shinfo(skb)->frags[0]; 110 unsigned int size; 111 /* 112 * There is only two buffers needed for max_payload = 4K, 113 * first buf size is IPOIB_UD_HEAD_SIZE 114 */ 115 skb->tail += IPOIB_UD_HEAD_SIZE; 116 skb->len += length; 117 118 size = length - IPOIB_UD_HEAD_SIZE; 119 120 frag->size = size; 121 skb->data_len += size; 122 skb->truesize += size; 123 } else 124 skb_put(skb, length); 125 126 } 127 128 static int ipoib_ib_post_receive(struct net_device *dev, int id) 129 { 130 struct ipoib_dev_priv *priv = netdev_priv(dev); 131 struct ib_recv_wr *bad_wr; 132 int ret; 133 134 priv->rx_wr.wr_id = id | IPOIB_OP_RECV; 135 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; 136 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; 137 138 139 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr); 140 if (unlikely(ret)) { 141 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 142 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); 143 dev_kfree_skb_any(priv->rx_ring[id].skb); 144 priv->rx_ring[id].skb = NULL; 145 } 146 147 return ret; 148 } 149 150 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) 151 { 152 struct ipoib_dev_priv *priv = netdev_priv(dev); 153 struct sk_buff *skb; 154 int buf_size; 155 u64 *mapping; 156 157 if (ipoib_ud_need_sg(priv->max_ib_mtu)) 158 buf_size = IPOIB_UD_HEAD_SIZE; 159 else 160 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 161 162 skb = dev_alloc_skb(buf_size + 4); 163 if (unlikely(!skb)) 164 return NULL; 165 166 /* 167 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 168 * header. So we need 4 more bytes to get to 48 and align the 169 * IP header to a multiple of 16. 170 */ 171 skb_reserve(skb, 4); 172 173 mapping = priv->rx_ring[id].mapping; 174 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 175 DMA_FROM_DEVICE); 176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 177 goto error; 178 179 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 180 struct page *page = alloc_page(GFP_ATOMIC); 181 if (!page) 182 goto partial_error; 183 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE); 184 mapping[1] = 185 ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page, 186 0, PAGE_SIZE, DMA_FROM_DEVICE); 187 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1]))) 188 goto partial_error; 189 } 190 191 priv->rx_ring[id].skb = skb; 192 return skb; 193 194 partial_error: 195 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE); 196 error: 197 dev_kfree_skb_any(skb); 198 return NULL; 199 } 200 201 static int ipoib_ib_post_receives(struct net_device *dev) 202 { 203 struct ipoib_dev_priv *priv = netdev_priv(dev); 204 int i; 205 206 for (i = 0; i < ipoib_recvq_size; ++i) { 207 if (!ipoib_alloc_rx_skb(dev, i)) { 208 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 209 return -ENOMEM; 210 } 211 if (ipoib_ib_post_receive(dev, i)) { 212 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 213 return -EIO; 214 } 215 } 216 217 return 0; 218 } 219 220 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 221 { 222 struct ipoib_dev_priv *priv = netdev_priv(dev); 223 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 224 struct sk_buff *skb; 225 u64 mapping[IPOIB_UD_RX_SG]; 226 union ib_gid *dgid; 227 228 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 229 wr_id, wc->status); 230 231 if (unlikely(wr_id >= ipoib_recvq_size)) { 232 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 233 wr_id, ipoib_recvq_size); 234 return; 235 } 236 237 skb = priv->rx_ring[wr_id].skb; 238 239 if (unlikely(wc->status != IB_WC_SUCCESS)) { 240 if (wc->status != IB_WC_WR_FLUSH_ERR) 241 ipoib_warn(priv, "failed recv event " 242 "(status=%d, wrid=%d vend_err %x)\n", 243 wc->status, wr_id, wc->vendor_err); 244 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 245 dev_kfree_skb_any(skb); 246 priv->rx_ring[wr_id].skb = NULL; 247 return; 248 } 249 250 /* 251 * Drop packets that this interface sent, ie multicast packets 252 * that the HCA has replicated. 253 */ 254 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 255 goto repost; 256 257 memcpy(mapping, priv->rx_ring[wr_id].mapping, 258 IPOIB_UD_RX_SG * sizeof *mapping); 259 260 /* 261 * If we can't allocate a new RX buffer, dump 262 * this packet and reuse the old buffer. 263 */ 264 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 265 ++dev->stats.rx_dropped; 266 goto repost; 267 } 268 269 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 270 wc->byte_len, wc->slid); 271 272 ipoib_ud_dma_unmap_rx(priv, mapping); 273 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len); 274 275 /* First byte of dgid signals multicast when 0xff */ 276 dgid = &((struct ib_grh *)skb->data)->dgid; 277 278 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff) 279 skb->pkt_type = PACKET_HOST; 280 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0) 281 skb->pkt_type = PACKET_BROADCAST; 282 else 283 skb->pkt_type = PACKET_MULTICAST; 284 285 skb_pull(skb, IB_GRH_BYTES); 286 287 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 288 skb_reset_mac_header(skb); 289 skb_pull(skb, IPOIB_ENCAP_LEN); 290 291 ++dev->stats.rx_packets; 292 dev->stats.rx_bytes += skb->len; 293 294 skb->dev = dev; 295 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok)) 296 skb->ip_summed = CHECKSUM_UNNECESSARY; 297 298 if (dev->features & NETIF_F_LRO) 299 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL); 300 else 301 netif_receive_skb(skb); 302 303 repost: 304 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 305 ipoib_warn(priv, "ipoib_ib_post_receive failed " 306 "for buf %d\n", wr_id); 307 } 308 309 static int ipoib_dma_map_tx(struct ib_device *ca, 310 struct ipoib_tx_buf *tx_req) 311 { 312 struct sk_buff *skb = tx_req->skb; 313 u64 *mapping = tx_req->mapping; 314 int i; 315 int off; 316 317 if (skb_headlen(skb)) { 318 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 319 DMA_TO_DEVICE); 320 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 321 return -EIO; 322 323 off = 1; 324 } else 325 off = 0; 326 327 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 328 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 329 mapping[i + off] = ib_dma_map_page(ca, frag->page, 330 frag->page_offset, frag->size, 331 DMA_TO_DEVICE); 332 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 333 goto partial_error; 334 } 335 return 0; 336 337 partial_error: 338 for (; i > 0; --i) { 339 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 340 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE); 341 } 342 343 if (off) 344 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 345 346 return -EIO; 347 } 348 349 static void ipoib_dma_unmap_tx(struct ib_device *ca, 350 struct ipoib_tx_buf *tx_req) 351 { 352 struct sk_buff *skb = tx_req->skb; 353 u64 *mapping = tx_req->mapping; 354 int i; 355 int off; 356 357 if (skb_headlen(skb)) { 358 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 359 off = 1; 360 } else 361 off = 0; 362 363 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 364 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 365 ib_dma_unmap_page(ca, mapping[i + off], frag->size, 366 DMA_TO_DEVICE); 367 } 368 } 369 370 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 371 { 372 struct ipoib_dev_priv *priv = netdev_priv(dev); 373 unsigned int wr_id = wc->wr_id; 374 struct ipoib_tx_buf *tx_req; 375 376 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 377 wr_id, wc->status); 378 379 if (unlikely(wr_id >= ipoib_sendq_size)) { 380 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 381 wr_id, ipoib_sendq_size); 382 return; 383 } 384 385 tx_req = &priv->tx_ring[wr_id]; 386 387 ipoib_dma_unmap_tx(priv->ca, tx_req); 388 389 ++dev->stats.tx_packets; 390 dev->stats.tx_bytes += tx_req->skb->len; 391 392 dev_kfree_skb_any(tx_req->skb); 393 394 ++priv->tx_tail; 395 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 396 netif_queue_stopped(dev) && 397 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 398 netif_wake_queue(dev); 399 400 if (wc->status != IB_WC_SUCCESS && 401 wc->status != IB_WC_WR_FLUSH_ERR) 402 ipoib_warn(priv, "failed send event " 403 "(status=%d, wrid=%d vend_err %x)\n", 404 wc->status, wr_id, wc->vendor_err); 405 } 406 407 static int poll_tx(struct ipoib_dev_priv *priv) 408 { 409 int n, i; 410 411 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 412 for (i = 0; i < n; ++i) 413 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 414 415 return n == MAX_SEND_CQE; 416 } 417 418 int ipoib_poll(struct napi_struct *napi, int budget) 419 { 420 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 421 struct net_device *dev = priv->dev; 422 int done; 423 int t; 424 int n, i; 425 426 done = 0; 427 428 poll_more: 429 while (done < budget) { 430 int max = (budget - done); 431 432 t = min(IPOIB_NUM_WC, max); 433 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 434 435 for (i = 0; i < n; i++) { 436 struct ib_wc *wc = priv->ibwc + i; 437 438 if (wc->wr_id & IPOIB_OP_RECV) { 439 ++done; 440 if (wc->wr_id & IPOIB_OP_CM) 441 ipoib_cm_handle_rx_wc(dev, wc); 442 else 443 ipoib_ib_handle_rx_wc(dev, wc); 444 } else 445 ipoib_cm_handle_tx_wc(priv->dev, wc); 446 } 447 448 if (n != t) 449 break; 450 } 451 452 if (done < budget) { 453 if (dev->features & NETIF_F_LRO) 454 lro_flush_all(&priv->lro.lro_mgr); 455 456 napi_complete(napi); 457 if (unlikely(ib_req_notify_cq(priv->recv_cq, 458 IB_CQ_NEXT_COMP | 459 IB_CQ_REPORT_MISSED_EVENTS)) && 460 napi_reschedule(napi)) 461 goto poll_more; 462 } 463 464 return done; 465 } 466 467 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 468 { 469 struct net_device *dev = dev_ptr; 470 struct ipoib_dev_priv *priv = netdev_priv(dev); 471 472 napi_schedule(&priv->napi); 473 } 474 475 static void drain_tx_cq(struct net_device *dev) 476 { 477 struct ipoib_dev_priv *priv = netdev_priv(dev); 478 479 netif_tx_lock(dev); 480 while (poll_tx(priv)) 481 ; /* nothing */ 482 483 if (netif_queue_stopped(dev)) 484 mod_timer(&priv->poll_timer, jiffies + 1); 485 486 netif_tx_unlock(dev); 487 } 488 489 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 490 { 491 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 492 493 mod_timer(&priv->poll_timer, jiffies); 494 } 495 496 static inline int post_send(struct ipoib_dev_priv *priv, 497 unsigned int wr_id, 498 struct ib_ah *address, u32 qpn, 499 struct ipoib_tx_buf *tx_req, 500 void *head, int hlen) 501 { 502 struct ib_send_wr *bad_wr; 503 int i, off; 504 struct sk_buff *skb = tx_req->skb; 505 skb_frag_t *frags = skb_shinfo(skb)->frags; 506 int nr_frags = skb_shinfo(skb)->nr_frags; 507 u64 *mapping = tx_req->mapping; 508 509 if (skb_headlen(skb)) { 510 priv->tx_sge[0].addr = mapping[0]; 511 priv->tx_sge[0].length = skb_headlen(skb); 512 off = 1; 513 } else 514 off = 0; 515 516 for (i = 0; i < nr_frags; ++i) { 517 priv->tx_sge[i + off].addr = mapping[i + off]; 518 priv->tx_sge[i + off].length = frags[i].size; 519 } 520 priv->tx_wr.num_sge = nr_frags + off; 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 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 598 address->ah, qpn, tx_req, phead, hlen); 599 if (unlikely(rc)) { 600 ipoib_warn(priv, "post_send failed, error %d\n", rc); 601 ++dev->stats.tx_errors; 602 --priv->tx_outstanding; 603 ipoib_dma_unmap_tx(priv->ca, tx_req); 604 dev_kfree_skb_any(skb); 605 if (netif_queue_stopped(dev)) 606 netif_wake_queue(dev); 607 } else { 608 dev->trans_start = jiffies; 609 610 address->last_send = priv->tx_head; 611 ++priv->tx_head; 612 skb_orphan(skb); 613 614 } 615 616 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 617 while (poll_tx(priv)) 618 ; /* nothing */ 619 } 620 621 static void __ipoib_reap_ah(struct net_device *dev) 622 { 623 struct ipoib_dev_priv *priv = netdev_priv(dev); 624 struct ipoib_ah *ah, *tah; 625 LIST_HEAD(remove_list); 626 unsigned long flags; 627 628 netif_tx_lock_bh(dev); 629 spin_lock_irqsave(&priv->lock, flags); 630 631 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 632 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 633 list_del(&ah->list); 634 ib_destroy_ah(ah->ah); 635 kfree(ah); 636 } 637 638 spin_unlock_irqrestore(&priv->lock, flags); 639 netif_tx_unlock_bh(dev); 640 } 641 642 void ipoib_reap_ah(struct work_struct *work) 643 { 644 struct ipoib_dev_priv *priv = 645 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 646 struct net_device *dev = priv->dev; 647 648 __ipoib_reap_ah(dev); 649 650 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 651 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 652 round_jiffies_relative(HZ)); 653 } 654 655 static void ipoib_ib_tx_timer_func(unsigned long ctx) 656 { 657 drain_tx_cq((struct net_device *)ctx); 658 } 659 660 int ipoib_ib_dev_open(struct net_device *dev) 661 { 662 struct ipoib_dev_priv *priv = netdev_priv(dev); 663 int ret; 664 665 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) { 666 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey); 667 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 668 return -1; 669 } 670 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 671 672 ret = ipoib_init_qp(dev); 673 if (ret) { 674 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 675 return -1; 676 } 677 678 ret = ipoib_ib_post_receives(dev); 679 if (ret) { 680 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 681 ipoib_ib_dev_stop(dev, 1); 682 return -1; 683 } 684 685 ret = ipoib_cm_dev_open(dev); 686 if (ret) { 687 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 688 ipoib_ib_dev_stop(dev, 1); 689 return -1; 690 } 691 692 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 693 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 694 round_jiffies_relative(HZ)); 695 696 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 697 napi_enable(&priv->napi); 698 699 return 0; 700 } 701 702 static void ipoib_pkey_dev_check_presence(struct net_device *dev) 703 { 704 struct ipoib_dev_priv *priv = netdev_priv(dev); 705 u16 pkey_index = 0; 706 707 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) 708 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 709 else 710 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 711 } 712 713 int ipoib_ib_dev_up(struct net_device *dev) 714 { 715 struct ipoib_dev_priv *priv = netdev_priv(dev); 716 717 ipoib_pkey_dev_check_presence(dev); 718 719 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 720 ipoib_dbg(priv, "PKEY is not assigned.\n"); 721 return 0; 722 } 723 724 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 725 726 return ipoib_mcast_start_thread(dev); 727 } 728 729 int ipoib_ib_dev_down(struct net_device *dev, int flush) 730 { 731 struct ipoib_dev_priv *priv = netdev_priv(dev); 732 733 ipoib_dbg(priv, "downing ib_dev\n"); 734 735 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 736 netif_carrier_off(dev); 737 738 /* Shutdown the P_Key thread if still active */ 739 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 740 mutex_lock(&pkey_mutex); 741 set_bit(IPOIB_PKEY_STOP, &priv->flags); 742 cancel_delayed_work(&priv->pkey_poll_task); 743 mutex_unlock(&pkey_mutex); 744 if (flush) 745 flush_workqueue(ipoib_workqueue); 746 } 747 748 ipoib_mcast_stop_thread(dev, flush); 749 ipoib_mcast_dev_flush(dev); 750 751 ipoib_flush_paths(dev); 752 753 return 0; 754 } 755 756 static int recvs_pending(struct net_device *dev) 757 { 758 struct ipoib_dev_priv *priv = netdev_priv(dev); 759 int pending = 0; 760 int i; 761 762 for (i = 0; i < ipoib_recvq_size; ++i) 763 if (priv->rx_ring[i].skb) 764 ++pending; 765 766 return pending; 767 } 768 769 void ipoib_drain_cq(struct net_device *dev) 770 { 771 struct ipoib_dev_priv *priv = netdev_priv(dev); 772 int i, n; 773 774 /* 775 * We call completion handling routines that expect to be 776 * called from the BH-disabled NAPI poll context, so disable 777 * BHs here too. 778 */ 779 local_bh_disable(); 780 781 do { 782 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 783 for (i = 0; i < n; ++i) { 784 /* 785 * Convert any successful completions to flush 786 * errors to avoid passing packets up the 787 * stack after bringing the device down. 788 */ 789 if (priv->ibwc[i].status == IB_WC_SUCCESS) 790 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 791 792 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 793 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 794 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 795 else 796 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 797 } else 798 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 799 } 800 } while (n == IPOIB_NUM_WC); 801 802 while (poll_tx(priv)) 803 ; /* nothing */ 804 805 local_bh_enable(); 806 } 807 808 int ipoib_ib_dev_stop(struct net_device *dev, int flush) 809 { 810 struct ipoib_dev_priv *priv = netdev_priv(dev); 811 struct ib_qp_attr qp_attr; 812 unsigned long begin; 813 struct ipoib_tx_buf *tx_req; 814 int i; 815 816 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 817 napi_disable(&priv->napi); 818 819 ipoib_cm_dev_stop(dev); 820 821 /* 822 * Move our QP to the error state and then reinitialize in 823 * when all work requests have completed or have been flushed. 824 */ 825 qp_attr.qp_state = IB_QPS_ERR; 826 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 827 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 828 829 /* Wait for all sends and receives to complete */ 830 begin = jiffies; 831 832 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 833 if (time_after(jiffies, begin + 5 * HZ)) { 834 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 835 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 836 837 /* 838 * assume the HW is wedged and just free up 839 * all our pending work requests. 840 */ 841 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 842 tx_req = &priv->tx_ring[priv->tx_tail & 843 (ipoib_sendq_size - 1)]; 844 ipoib_dma_unmap_tx(priv->ca, tx_req); 845 dev_kfree_skb_any(tx_req->skb); 846 ++priv->tx_tail; 847 --priv->tx_outstanding; 848 } 849 850 for (i = 0; i < ipoib_recvq_size; ++i) { 851 struct ipoib_rx_buf *rx_req; 852 853 rx_req = &priv->rx_ring[i]; 854 if (!rx_req->skb) 855 continue; 856 ipoib_ud_dma_unmap_rx(priv, 857 priv->rx_ring[i].mapping); 858 dev_kfree_skb_any(rx_req->skb); 859 rx_req->skb = NULL; 860 } 861 862 goto timeout; 863 } 864 865 ipoib_drain_cq(dev); 866 867 msleep(1); 868 } 869 870 ipoib_dbg(priv, "All sends and receives done.\n"); 871 872 timeout: 873 del_timer_sync(&priv->poll_timer); 874 qp_attr.qp_state = IB_QPS_RESET; 875 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 876 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 877 878 /* Wait for all AHs to be reaped */ 879 set_bit(IPOIB_STOP_REAPER, &priv->flags); 880 cancel_delayed_work(&priv->ah_reap_task); 881 if (flush) 882 flush_workqueue(ipoib_workqueue); 883 884 begin = jiffies; 885 886 while (!list_empty(&priv->dead_ahs)) { 887 __ipoib_reap_ah(dev); 888 889 if (time_after(jiffies, begin + HZ)) { 890 ipoib_warn(priv, "timing out; will leak address handles\n"); 891 break; 892 } 893 894 msleep(1); 895 } 896 897 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 898 899 return 0; 900 } 901 902 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 903 { 904 struct ipoib_dev_priv *priv = netdev_priv(dev); 905 906 priv->ca = ca; 907 priv->port = port; 908 priv->qp = NULL; 909 910 if (ipoib_transport_dev_init(dev, ca)) { 911 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 912 return -ENODEV; 913 } 914 915 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 916 (unsigned long) dev); 917 918 if (dev->flags & IFF_UP) { 919 if (ipoib_ib_dev_open(dev)) { 920 ipoib_transport_dev_cleanup(dev); 921 return -ENODEV; 922 } 923 } 924 925 return 0; 926 } 927 928 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 929 enum ipoib_flush_level level) 930 { 931 struct ipoib_dev_priv *cpriv; 932 struct net_device *dev = priv->dev; 933 u16 new_index; 934 935 mutex_lock(&priv->vlan_mutex); 936 937 /* 938 * Flush any child interfaces too -- they might be up even if 939 * the parent is down. 940 */ 941 list_for_each_entry(cpriv, &priv->child_intfs, list) 942 __ipoib_ib_dev_flush(cpriv, level); 943 944 mutex_unlock(&priv->vlan_mutex); 945 946 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) { 947 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 948 return; 949 } 950 951 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 952 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 953 return; 954 } 955 956 if (level == IPOIB_FLUSH_HEAVY) { 957 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) { 958 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 959 ipoib_ib_dev_down(dev, 0); 960 ipoib_ib_dev_stop(dev, 0); 961 if (ipoib_pkey_dev_delay_open(dev)) 962 return; 963 } 964 965 /* restart QP only if P_Key index is changed */ 966 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 967 new_index == priv->pkey_index) { 968 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 969 return; 970 } 971 priv->pkey_index = new_index; 972 } 973 974 if (level == IPOIB_FLUSH_LIGHT) { 975 ipoib_mark_paths_invalid(dev); 976 ipoib_mcast_dev_flush(dev); 977 } 978 979 if (level >= IPOIB_FLUSH_NORMAL) 980 ipoib_ib_dev_down(dev, 0); 981 982 if (level == IPOIB_FLUSH_HEAVY) { 983 ipoib_ib_dev_stop(dev, 0); 984 ipoib_ib_dev_open(dev); 985 } 986 987 /* 988 * The device could have been brought down between the start and when 989 * we get here, don't bring it back up if it's not configured up 990 */ 991 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 992 if (level >= IPOIB_FLUSH_NORMAL) 993 ipoib_ib_dev_up(dev); 994 ipoib_mcast_restart_task(&priv->restart_task); 995 } 996 } 997 998 void ipoib_ib_dev_flush_light(struct work_struct *work) 999 { 1000 struct ipoib_dev_priv *priv = 1001 container_of(work, struct ipoib_dev_priv, flush_light); 1002 1003 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT); 1004 } 1005 1006 void ipoib_ib_dev_flush_normal(struct work_struct *work) 1007 { 1008 struct ipoib_dev_priv *priv = 1009 container_of(work, struct ipoib_dev_priv, flush_normal); 1010 1011 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL); 1012 } 1013 1014 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1015 { 1016 struct ipoib_dev_priv *priv = 1017 container_of(work, struct ipoib_dev_priv, flush_heavy); 1018 1019 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY); 1020 } 1021 1022 void ipoib_ib_dev_cleanup(struct net_device *dev) 1023 { 1024 struct ipoib_dev_priv *priv = netdev_priv(dev); 1025 1026 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1027 1028 ipoib_mcast_stop_thread(dev, 1); 1029 ipoib_mcast_dev_flush(dev); 1030 1031 ipoib_transport_dev_cleanup(dev); 1032 } 1033 1034 /* 1035 * Delayed P_Key Assigment Interim Support 1036 * 1037 * The following is initial implementation of delayed P_Key assigment 1038 * mechanism. It is using the same approach implemented for the multicast 1039 * group join. The single goal of this implementation is to quickly address 1040 * Bug #2507. This implementation will probably be removed when the P_Key 1041 * change async notification is available. 1042 */ 1043 1044 void ipoib_pkey_poll(struct work_struct *work) 1045 { 1046 struct ipoib_dev_priv *priv = 1047 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work); 1048 struct net_device *dev = priv->dev; 1049 1050 ipoib_pkey_dev_check_presence(dev); 1051 1052 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 1053 ipoib_open(dev); 1054 else { 1055 mutex_lock(&pkey_mutex); 1056 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags)) 1057 queue_delayed_work(ipoib_workqueue, 1058 &priv->pkey_poll_task, 1059 HZ); 1060 mutex_unlock(&pkey_mutex); 1061 } 1062 } 1063 1064 int ipoib_pkey_dev_delay_open(struct net_device *dev) 1065 { 1066 struct ipoib_dev_priv *priv = netdev_priv(dev); 1067 1068 /* Look for the interface pkey value in the IB Port P_Key table and */ 1069 /* set the interface pkey assigment flag */ 1070 ipoib_pkey_dev_check_presence(dev); 1071 1072 /* P_Key value not assigned yet - start polling */ 1073 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 1074 mutex_lock(&pkey_mutex); 1075 clear_bit(IPOIB_PKEY_STOP, &priv->flags); 1076 queue_delayed_work(ipoib_workqueue, 1077 &priv->pkey_poll_task, 1078 HZ); 1079 mutex_unlock(&pkey_mutex); 1080 return 1; 1081 } 1082 1083 return 0; 1084 } 1085