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 39 #include <linux/ip.h> 40 #include <linux/tcp.h> 41 42 #include "ipoib.h" 43 44 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 45 static int data_debug_level; 46 47 module_param(data_debug_level, int, 0644); 48 MODULE_PARM_DESC(data_debug_level, 49 "Enable data path debug tracing if > 0"); 50 #endif 51 52 static DEFINE_MUTEX(pkey_mutex); 53 54 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 55 struct ib_pd *pd, struct ib_ah_attr *attr) 56 { 57 struct ipoib_ah *ah; 58 59 ah = kmalloc(sizeof *ah, GFP_KERNEL); 60 if (!ah) 61 return NULL; 62 63 ah->dev = dev; 64 ah->last_send = 0; 65 kref_init(&ah->ref); 66 67 ah->ah = ib_create_ah(pd, attr); 68 if (IS_ERR(ah->ah)) { 69 kfree(ah); 70 ah = NULL; 71 } else 72 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 73 74 return ah; 75 } 76 77 void ipoib_free_ah(struct kref *kref) 78 { 79 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 80 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 81 82 unsigned long flags; 83 84 spin_lock_irqsave(&priv->lock, flags); 85 list_add_tail(&ah->list, &priv->dead_ahs); 86 spin_unlock_irqrestore(&priv->lock, flags); 87 } 88 89 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, 90 u64 mapping[IPOIB_UD_RX_SG]) 91 { 92 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 93 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE, 94 DMA_FROM_DEVICE); 95 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE, 96 DMA_FROM_DEVICE); 97 } else 98 ib_dma_unmap_single(priv->ca, mapping[0], 99 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), 100 DMA_FROM_DEVICE); 101 } 102 103 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv, 104 struct sk_buff *skb, 105 unsigned int length) 106 { 107 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 108 skb_frag_t *frag = &skb_shinfo(skb)->frags[0]; 109 unsigned int size; 110 /* 111 * There is only two buffers needed for max_payload = 4K, 112 * first buf size is IPOIB_UD_HEAD_SIZE 113 */ 114 skb->tail += IPOIB_UD_HEAD_SIZE; 115 skb->len += length; 116 117 size = length - IPOIB_UD_HEAD_SIZE; 118 119 frag->size = size; 120 skb->data_len += size; 121 skb->truesize += size; 122 } else 123 skb_put(skb, length); 124 125 } 126 127 static int ipoib_ib_post_receive(struct net_device *dev, int id) 128 { 129 struct ipoib_dev_priv *priv = netdev_priv(dev); 130 struct ib_recv_wr *bad_wr; 131 int ret; 132 133 priv->rx_wr.wr_id = id | IPOIB_OP_RECV; 134 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; 135 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; 136 137 138 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr); 139 if (unlikely(ret)) { 140 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 141 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); 142 dev_kfree_skb_any(priv->rx_ring[id].skb); 143 priv->rx_ring[id].skb = NULL; 144 } 145 146 return ret; 147 } 148 149 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) 150 { 151 struct ipoib_dev_priv *priv = netdev_priv(dev); 152 struct sk_buff *skb; 153 int buf_size; 154 u64 *mapping; 155 156 if (ipoib_ud_need_sg(priv->max_ib_mtu)) 157 buf_size = IPOIB_UD_HEAD_SIZE; 158 else 159 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 160 161 skb = dev_alloc_skb(buf_size + 4); 162 if (unlikely(!skb)) 163 return NULL; 164 165 /* 166 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 167 * header. So we need 4 more bytes to get to 48 and align the 168 * IP header to a multiple of 16. 169 */ 170 skb_reserve(skb, 4); 171 172 mapping = priv->rx_ring[id].mapping; 173 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 174 DMA_FROM_DEVICE); 175 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 176 goto error; 177 178 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 179 struct page *page = alloc_page(GFP_ATOMIC); 180 if (!page) 181 goto partial_error; 182 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE); 183 mapping[1] = 184 ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page, 185 0, PAGE_SIZE, DMA_FROM_DEVICE); 186 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1]))) 187 goto partial_error; 188 } 189 190 priv->rx_ring[id].skb = skb; 191 return skb; 192 193 partial_error: 194 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE); 195 error: 196 dev_kfree_skb_any(skb); 197 return NULL; 198 } 199 200 static int ipoib_ib_post_receives(struct net_device *dev) 201 { 202 struct ipoib_dev_priv *priv = netdev_priv(dev); 203 int i; 204 205 for (i = 0; i < ipoib_recvq_size; ++i) { 206 if (!ipoib_alloc_rx_skb(dev, i)) { 207 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 208 return -ENOMEM; 209 } 210 if (ipoib_ib_post_receive(dev, i)) { 211 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 212 return -EIO; 213 } 214 } 215 216 return 0; 217 } 218 219 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 220 { 221 struct ipoib_dev_priv *priv = netdev_priv(dev); 222 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 223 struct sk_buff *skb; 224 u64 mapping[IPOIB_UD_RX_SG]; 225 226 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 227 wr_id, wc->status); 228 229 if (unlikely(wr_id >= ipoib_recvq_size)) { 230 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 231 wr_id, ipoib_recvq_size); 232 return; 233 } 234 235 skb = priv->rx_ring[wr_id].skb; 236 237 if (unlikely(wc->status != IB_WC_SUCCESS)) { 238 if (wc->status != IB_WC_WR_FLUSH_ERR) 239 ipoib_warn(priv, "failed recv event " 240 "(status=%d, wrid=%d vend_err %x)\n", 241 wc->status, wr_id, wc->vendor_err); 242 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 243 dev_kfree_skb_any(skb); 244 priv->rx_ring[wr_id].skb = NULL; 245 return; 246 } 247 248 /* 249 * Drop packets that this interface sent, ie multicast packets 250 * that the HCA has replicated. 251 */ 252 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 253 goto repost; 254 255 memcpy(mapping, priv->rx_ring[wr_id].mapping, 256 IPOIB_UD_RX_SG * sizeof *mapping); 257 258 /* 259 * If we can't allocate a new RX buffer, dump 260 * this packet and reuse the old buffer. 261 */ 262 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 263 ++dev->stats.rx_dropped; 264 goto repost; 265 } 266 267 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 268 wc->byte_len, wc->slid); 269 270 ipoib_ud_dma_unmap_rx(priv, mapping); 271 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len); 272 273 skb_pull(skb, IB_GRH_BYTES); 274 275 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 276 skb_reset_mac_header(skb); 277 skb_pull(skb, IPOIB_ENCAP_LEN); 278 279 ++dev->stats.rx_packets; 280 dev->stats.rx_bytes += skb->len; 281 282 skb->dev = dev; 283 /* XXX get correct PACKET_ type here */ 284 skb->pkt_type = PACKET_HOST; 285 286 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok)) 287 skb->ip_summed = CHECKSUM_UNNECESSARY; 288 289 if (dev->features & NETIF_F_LRO) 290 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL); 291 else 292 netif_receive_skb(skb); 293 294 repost: 295 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 296 ipoib_warn(priv, "ipoib_ib_post_receive failed " 297 "for buf %d\n", wr_id); 298 } 299 300 static int ipoib_dma_map_tx(struct ib_device *ca, 301 struct ipoib_tx_buf *tx_req) 302 { 303 struct sk_buff *skb = tx_req->skb; 304 u64 *mapping = tx_req->mapping; 305 int i; 306 int off; 307 308 if (skb_headlen(skb)) { 309 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 310 DMA_TO_DEVICE); 311 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 312 return -EIO; 313 314 off = 1; 315 } else 316 off = 0; 317 318 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 319 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 320 mapping[i + off] = ib_dma_map_page(ca, frag->page, 321 frag->page_offset, frag->size, 322 DMA_TO_DEVICE); 323 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 324 goto partial_error; 325 } 326 return 0; 327 328 partial_error: 329 for (; i > 0; --i) { 330 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 331 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE); 332 } 333 334 if (off) 335 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 336 337 return -EIO; 338 } 339 340 static void ipoib_dma_unmap_tx(struct ib_device *ca, 341 struct ipoib_tx_buf *tx_req) 342 { 343 struct sk_buff *skb = tx_req->skb; 344 u64 *mapping = tx_req->mapping; 345 int i; 346 int off; 347 348 if (skb_headlen(skb)) { 349 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 350 off = 1; 351 } else 352 off = 0; 353 354 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 355 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 356 ib_dma_unmap_page(ca, mapping[i + off], frag->size, 357 DMA_TO_DEVICE); 358 } 359 } 360 361 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 362 { 363 struct ipoib_dev_priv *priv = netdev_priv(dev); 364 unsigned int wr_id = wc->wr_id; 365 struct ipoib_tx_buf *tx_req; 366 367 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 368 wr_id, wc->status); 369 370 if (unlikely(wr_id >= ipoib_sendq_size)) { 371 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 372 wr_id, ipoib_sendq_size); 373 return; 374 } 375 376 tx_req = &priv->tx_ring[wr_id]; 377 378 ipoib_dma_unmap_tx(priv->ca, tx_req); 379 380 ++dev->stats.tx_packets; 381 dev->stats.tx_bytes += tx_req->skb->len; 382 383 dev_kfree_skb_any(tx_req->skb); 384 385 ++priv->tx_tail; 386 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 387 netif_queue_stopped(dev) && 388 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 389 netif_wake_queue(dev); 390 391 if (wc->status != IB_WC_SUCCESS && 392 wc->status != IB_WC_WR_FLUSH_ERR) 393 ipoib_warn(priv, "failed send event " 394 "(status=%d, wrid=%d vend_err %x)\n", 395 wc->status, wr_id, wc->vendor_err); 396 } 397 398 static int poll_tx(struct ipoib_dev_priv *priv) 399 { 400 int n, i; 401 402 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 403 for (i = 0; i < n; ++i) 404 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 405 406 return n == MAX_SEND_CQE; 407 } 408 409 int ipoib_poll(struct napi_struct *napi, int budget) 410 { 411 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 412 struct net_device *dev = priv->dev; 413 int done; 414 int t; 415 int n, i; 416 417 done = 0; 418 419 poll_more: 420 while (done < budget) { 421 int max = (budget - done); 422 423 t = min(IPOIB_NUM_WC, max); 424 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 425 426 for (i = 0; i < n; i++) { 427 struct ib_wc *wc = priv->ibwc + i; 428 429 if (wc->wr_id & IPOIB_OP_RECV) { 430 ++done; 431 if (wc->wr_id & IPOIB_OP_CM) 432 ipoib_cm_handle_rx_wc(dev, wc); 433 else 434 ipoib_ib_handle_rx_wc(dev, wc); 435 } else 436 ipoib_cm_handle_tx_wc(priv->dev, wc); 437 } 438 439 if (n != t) 440 break; 441 } 442 443 if (done < budget) { 444 if (dev->features & NETIF_F_LRO) 445 lro_flush_all(&priv->lro.lro_mgr); 446 447 napi_complete(napi); 448 if (unlikely(ib_req_notify_cq(priv->recv_cq, 449 IB_CQ_NEXT_COMP | 450 IB_CQ_REPORT_MISSED_EVENTS)) && 451 napi_reschedule(napi)) 452 goto poll_more; 453 } 454 455 return done; 456 } 457 458 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 459 { 460 struct net_device *dev = dev_ptr; 461 struct ipoib_dev_priv *priv = netdev_priv(dev); 462 463 napi_schedule(&priv->napi); 464 } 465 466 static void drain_tx_cq(struct net_device *dev) 467 { 468 struct ipoib_dev_priv *priv = netdev_priv(dev); 469 470 netif_tx_lock(dev); 471 while (poll_tx(priv)) 472 ; /* nothing */ 473 474 if (netif_queue_stopped(dev)) 475 mod_timer(&priv->poll_timer, jiffies + 1); 476 477 netif_tx_unlock(dev); 478 } 479 480 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 481 { 482 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 483 484 mod_timer(&priv->poll_timer, jiffies); 485 } 486 487 static inline int post_send(struct ipoib_dev_priv *priv, 488 unsigned int wr_id, 489 struct ib_ah *address, u32 qpn, 490 struct ipoib_tx_buf *tx_req, 491 void *head, int hlen) 492 { 493 struct ib_send_wr *bad_wr; 494 int i, off; 495 struct sk_buff *skb = tx_req->skb; 496 skb_frag_t *frags = skb_shinfo(skb)->frags; 497 int nr_frags = skb_shinfo(skb)->nr_frags; 498 u64 *mapping = tx_req->mapping; 499 500 if (skb_headlen(skb)) { 501 priv->tx_sge[0].addr = mapping[0]; 502 priv->tx_sge[0].length = skb_headlen(skb); 503 off = 1; 504 } else 505 off = 0; 506 507 for (i = 0; i < nr_frags; ++i) { 508 priv->tx_sge[i + off].addr = mapping[i + off]; 509 priv->tx_sge[i + off].length = frags[i].size; 510 } 511 priv->tx_wr.num_sge = nr_frags + off; 512 priv->tx_wr.wr_id = wr_id; 513 priv->tx_wr.wr.ud.remote_qpn = qpn; 514 priv->tx_wr.wr.ud.ah = address; 515 516 if (head) { 517 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size; 518 priv->tx_wr.wr.ud.header = head; 519 priv->tx_wr.wr.ud.hlen = hlen; 520 priv->tx_wr.opcode = IB_WR_LSO; 521 } else 522 priv->tx_wr.opcode = IB_WR_SEND; 523 524 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 525 } 526 527 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 528 struct ipoib_ah *address, u32 qpn) 529 { 530 struct ipoib_dev_priv *priv = netdev_priv(dev); 531 struct ipoib_tx_buf *tx_req; 532 int hlen; 533 void *phead; 534 535 if (skb_is_gso(skb)) { 536 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 537 phead = skb->data; 538 if (unlikely(!skb_pull(skb, hlen))) { 539 ipoib_warn(priv, "linear data too small\n"); 540 ++dev->stats.tx_dropped; 541 ++dev->stats.tx_errors; 542 dev_kfree_skb_any(skb); 543 return; 544 } 545 } else { 546 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 547 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 548 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 549 ++dev->stats.tx_dropped; 550 ++dev->stats.tx_errors; 551 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 552 return; 553 } 554 phead = NULL; 555 hlen = 0; 556 } 557 558 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 559 skb->len, address, qpn); 560 561 /* 562 * We put the skb into the tx_ring _before_ we call post_send() 563 * because it's entirely possible that the completion handler will 564 * run before we execute anything after the post_send(). That 565 * means we have to make sure everything is properly recorded and 566 * our state is consistent before we call post_send(). 567 */ 568 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 569 tx_req->skb = skb; 570 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 571 ++dev->stats.tx_errors; 572 dev_kfree_skb_any(skb); 573 return; 574 } 575 576 if (skb->ip_summed == CHECKSUM_PARTIAL) 577 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM; 578 else 579 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 580 581 if (++priv->tx_outstanding == ipoib_sendq_size) { 582 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 583 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 584 ipoib_warn(priv, "request notify on send CQ failed\n"); 585 netif_stop_queue(dev); 586 } 587 588 if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 589 address->ah, qpn, tx_req, phead, hlen))) { 590 ipoib_warn(priv, "post_send failed\n"); 591 ++dev->stats.tx_errors; 592 --priv->tx_outstanding; 593 ipoib_dma_unmap_tx(priv->ca, tx_req); 594 dev_kfree_skb_any(skb); 595 if (netif_queue_stopped(dev)) 596 netif_wake_queue(dev); 597 } else { 598 dev->trans_start = jiffies; 599 600 address->last_send = priv->tx_head; 601 ++priv->tx_head; 602 skb_orphan(skb); 603 604 } 605 606 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 607 while (poll_tx(priv)) 608 ; /* nothing */ 609 } 610 611 static void __ipoib_reap_ah(struct net_device *dev) 612 { 613 struct ipoib_dev_priv *priv = netdev_priv(dev); 614 struct ipoib_ah *ah, *tah; 615 LIST_HEAD(remove_list); 616 unsigned long flags; 617 618 netif_tx_lock_bh(dev); 619 spin_lock_irqsave(&priv->lock, flags); 620 621 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 622 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 623 list_del(&ah->list); 624 ib_destroy_ah(ah->ah); 625 kfree(ah); 626 } 627 628 spin_unlock_irqrestore(&priv->lock, flags); 629 netif_tx_unlock_bh(dev); 630 } 631 632 void ipoib_reap_ah(struct work_struct *work) 633 { 634 struct ipoib_dev_priv *priv = 635 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 636 struct net_device *dev = priv->dev; 637 638 __ipoib_reap_ah(dev); 639 640 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 641 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 642 round_jiffies_relative(HZ)); 643 } 644 645 static void ipoib_ib_tx_timer_func(unsigned long ctx) 646 { 647 drain_tx_cq((struct net_device *)ctx); 648 } 649 650 int ipoib_ib_dev_open(struct net_device *dev) 651 { 652 struct ipoib_dev_priv *priv = netdev_priv(dev); 653 int ret; 654 655 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) { 656 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey); 657 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 658 return -1; 659 } 660 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 661 662 ret = ipoib_init_qp(dev); 663 if (ret) { 664 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 665 return -1; 666 } 667 668 ret = ipoib_ib_post_receives(dev); 669 if (ret) { 670 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 671 ipoib_ib_dev_stop(dev, 1); 672 return -1; 673 } 674 675 ret = ipoib_cm_dev_open(dev); 676 if (ret) { 677 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 678 ipoib_ib_dev_stop(dev, 1); 679 return -1; 680 } 681 682 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 683 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 684 round_jiffies_relative(HZ)); 685 686 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 687 napi_enable(&priv->napi); 688 689 return 0; 690 } 691 692 static void ipoib_pkey_dev_check_presence(struct net_device *dev) 693 { 694 struct ipoib_dev_priv *priv = netdev_priv(dev); 695 u16 pkey_index = 0; 696 697 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) 698 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 699 else 700 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 701 } 702 703 int ipoib_ib_dev_up(struct net_device *dev) 704 { 705 struct ipoib_dev_priv *priv = netdev_priv(dev); 706 707 ipoib_pkey_dev_check_presence(dev); 708 709 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 710 ipoib_dbg(priv, "PKEY is not assigned.\n"); 711 return 0; 712 } 713 714 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 715 716 return ipoib_mcast_start_thread(dev); 717 } 718 719 int ipoib_ib_dev_down(struct net_device *dev, int flush) 720 { 721 struct ipoib_dev_priv *priv = netdev_priv(dev); 722 723 ipoib_dbg(priv, "downing ib_dev\n"); 724 725 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 726 netif_carrier_off(dev); 727 728 /* Shutdown the P_Key thread if still active */ 729 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 730 mutex_lock(&pkey_mutex); 731 set_bit(IPOIB_PKEY_STOP, &priv->flags); 732 cancel_delayed_work(&priv->pkey_poll_task); 733 mutex_unlock(&pkey_mutex); 734 if (flush) 735 flush_workqueue(ipoib_workqueue); 736 } 737 738 ipoib_mcast_stop_thread(dev, flush); 739 ipoib_mcast_dev_flush(dev); 740 741 ipoib_flush_paths(dev); 742 743 return 0; 744 } 745 746 static int recvs_pending(struct net_device *dev) 747 { 748 struct ipoib_dev_priv *priv = netdev_priv(dev); 749 int pending = 0; 750 int i; 751 752 for (i = 0; i < ipoib_recvq_size; ++i) 753 if (priv->rx_ring[i].skb) 754 ++pending; 755 756 return pending; 757 } 758 759 void ipoib_drain_cq(struct net_device *dev) 760 { 761 struct ipoib_dev_priv *priv = netdev_priv(dev); 762 int i, n; 763 764 /* 765 * We call completion handling routines that expect to be 766 * called from the BH-disabled NAPI poll context, so disable 767 * BHs here too. 768 */ 769 local_bh_disable(); 770 771 do { 772 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 773 for (i = 0; i < n; ++i) { 774 /* 775 * Convert any successful completions to flush 776 * errors to avoid passing packets up the 777 * stack after bringing the device down. 778 */ 779 if (priv->ibwc[i].status == IB_WC_SUCCESS) 780 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 781 782 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 783 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 784 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 785 else 786 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 787 } else 788 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 789 } 790 } while (n == IPOIB_NUM_WC); 791 792 while (poll_tx(priv)) 793 ; /* nothing */ 794 795 local_bh_enable(); 796 } 797 798 int ipoib_ib_dev_stop(struct net_device *dev, int flush) 799 { 800 struct ipoib_dev_priv *priv = netdev_priv(dev); 801 struct ib_qp_attr qp_attr; 802 unsigned long begin; 803 struct ipoib_tx_buf *tx_req; 804 int i; 805 806 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 807 napi_disable(&priv->napi); 808 809 ipoib_cm_dev_stop(dev); 810 811 /* 812 * Move our QP to the error state and then reinitialize in 813 * when all work requests have completed or have been flushed. 814 */ 815 qp_attr.qp_state = IB_QPS_ERR; 816 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 817 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 818 819 /* Wait for all sends and receives to complete */ 820 begin = jiffies; 821 822 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 823 if (time_after(jiffies, begin + 5 * HZ)) { 824 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 825 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 826 827 /* 828 * assume the HW is wedged and just free up 829 * all our pending work requests. 830 */ 831 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 832 tx_req = &priv->tx_ring[priv->tx_tail & 833 (ipoib_sendq_size - 1)]; 834 ipoib_dma_unmap_tx(priv->ca, tx_req); 835 dev_kfree_skb_any(tx_req->skb); 836 ++priv->tx_tail; 837 --priv->tx_outstanding; 838 } 839 840 for (i = 0; i < ipoib_recvq_size; ++i) { 841 struct ipoib_rx_buf *rx_req; 842 843 rx_req = &priv->rx_ring[i]; 844 if (!rx_req->skb) 845 continue; 846 ipoib_ud_dma_unmap_rx(priv, 847 priv->rx_ring[i].mapping); 848 dev_kfree_skb_any(rx_req->skb); 849 rx_req->skb = NULL; 850 } 851 852 goto timeout; 853 } 854 855 ipoib_drain_cq(dev); 856 857 msleep(1); 858 } 859 860 ipoib_dbg(priv, "All sends and receives done.\n"); 861 862 timeout: 863 del_timer_sync(&priv->poll_timer); 864 qp_attr.qp_state = IB_QPS_RESET; 865 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 866 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 867 868 /* Wait for all AHs to be reaped */ 869 set_bit(IPOIB_STOP_REAPER, &priv->flags); 870 cancel_delayed_work(&priv->ah_reap_task); 871 if (flush) 872 flush_workqueue(ipoib_workqueue); 873 874 begin = jiffies; 875 876 while (!list_empty(&priv->dead_ahs)) { 877 __ipoib_reap_ah(dev); 878 879 if (time_after(jiffies, begin + HZ)) { 880 ipoib_warn(priv, "timing out; will leak address handles\n"); 881 break; 882 } 883 884 msleep(1); 885 } 886 887 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 888 889 return 0; 890 } 891 892 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 893 { 894 struct ipoib_dev_priv *priv = netdev_priv(dev); 895 896 priv->ca = ca; 897 priv->port = port; 898 priv->qp = NULL; 899 900 if (ipoib_transport_dev_init(dev, ca)) { 901 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 902 return -ENODEV; 903 } 904 905 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 906 (unsigned long) dev); 907 908 if (dev->flags & IFF_UP) { 909 if (ipoib_ib_dev_open(dev)) { 910 ipoib_transport_dev_cleanup(dev); 911 return -ENODEV; 912 } 913 } 914 915 return 0; 916 } 917 918 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 919 enum ipoib_flush_level level) 920 { 921 struct ipoib_dev_priv *cpriv; 922 struct net_device *dev = priv->dev; 923 u16 new_index; 924 925 mutex_lock(&priv->vlan_mutex); 926 927 /* 928 * Flush any child interfaces too -- they might be up even if 929 * the parent is down. 930 */ 931 list_for_each_entry(cpriv, &priv->child_intfs, list) 932 __ipoib_ib_dev_flush(cpriv, level); 933 934 mutex_unlock(&priv->vlan_mutex); 935 936 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) { 937 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 938 return; 939 } 940 941 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 942 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 943 return; 944 } 945 946 if (level == IPOIB_FLUSH_HEAVY) { 947 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) { 948 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 949 ipoib_ib_dev_down(dev, 0); 950 ipoib_ib_dev_stop(dev, 0); 951 if (ipoib_pkey_dev_delay_open(dev)) 952 return; 953 } 954 955 /* restart QP only if P_Key index is changed */ 956 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 957 new_index == priv->pkey_index) { 958 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 959 return; 960 } 961 priv->pkey_index = new_index; 962 } 963 964 if (level == IPOIB_FLUSH_LIGHT) { 965 ipoib_mark_paths_invalid(dev); 966 ipoib_mcast_dev_flush(dev); 967 } 968 969 if (level >= IPOIB_FLUSH_NORMAL) 970 ipoib_ib_dev_down(dev, 0); 971 972 if (level == IPOIB_FLUSH_HEAVY) { 973 ipoib_ib_dev_stop(dev, 0); 974 ipoib_ib_dev_open(dev); 975 } 976 977 /* 978 * The device could have been brought down between the start and when 979 * we get here, don't bring it back up if it's not configured up 980 */ 981 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 982 if (level >= IPOIB_FLUSH_NORMAL) 983 ipoib_ib_dev_up(dev); 984 ipoib_mcast_restart_task(&priv->restart_task); 985 } 986 } 987 988 void ipoib_ib_dev_flush_light(struct work_struct *work) 989 { 990 struct ipoib_dev_priv *priv = 991 container_of(work, struct ipoib_dev_priv, flush_light); 992 993 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT); 994 } 995 996 void ipoib_ib_dev_flush_normal(struct work_struct *work) 997 { 998 struct ipoib_dev_priv *priv = 999 container_of(work, struct ipoib_dev_priv, flush_normal); 1000 1001 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL); 1002 } 1003 1004 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1005 { 1006 struct ipoib_dev_priv *priv = 1007 container_of(work, struct ipoib_dev_priv, flush_heavy); 1008 1009 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY); 1010 } 1011 1012 void ipoib_ib_dev_cleanup(struct net_device *dev) 1013 { 1014 struct ipoib_dev_priv *priv = netdev_priv(dev); 1015 1016 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1017 1018 ipoib_mcast_stop_thread(dev, 1); 1019 ipoib_mcast_dev_flush(dev); 1020 1021 ipoib_transport_dev_cleanup(dev); 1022 } 1023 1024 /* 1025 * Delayed P_Key Assigment Interim Support 1026 * 1027 * The following is initial implementation of delayed P_Key assigment 1028 * mechanism. It is using the same approach implemented for the multicast 1029 * group join. The single goal of this implementation is to quickly address 1030 * Bug #2507. This implementation will probably be removed when the P_Key 1031 * change async notification is available. 1032 */ 1033 1034 void ipoib_pkey_poll(struct work_struct *work) 1035 { 1036 struct ipoib_dev_priv *priv = 1037 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work); 1038 struct net_device *dev = priv->dev; 1039 1040 ipoib_pkey_dev_check_presence(dev); 1041 1042 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 1043 ipoib_open(dev); 1044 else { 1045 mutex_lock(&pkey_mutex); 1046 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags)) 1047 queue_delayed_work(ipoib_workqueue, 1048 &priv->pkey_poll_task, 1049 HZ); 1050 mutex_unlock(&pkey_mutex); 1051 } 1052 } 1053 1054 int ipoib_pkey_dev_delay_open(struct net_device *dev) 1055 { 1056 struct ipoib_dev_priv *priv = netdev_priv(dev); 1057 1058 /* Look for the interface pkey value in the IB Port P_Key table and */ 1059 /* set the interface pkey assigment flag */ 1060 ipoib_pkey_dev_check_presence(dev); 1061 1062 /* P_Key value not assigned yet - start polling */ 1063 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 1064 mutex_lock(&pkey_mutex); 1065 clear_bit(IPOIB_PKEY_STOP, &priv->flags); 1066 queue_delayed_work(ipoib_workqueue, 1067 &priv->pkey_poll_task, 1068 HZ); 1069 mutex_unlock(&pkey_mutex); 1070 return 1; 1071 } 1072 1073 return 0; 1074 } 1075