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 47static int data_debug_level; 48 49module_param(data_debug_level, int, 0644); 50MODULE_PARM_DESC(data_debug_level, 51 "Enable data path debug tracing if > 0"); 52#endif 53 54static DEFINE_MUTEX(pkey_mutex); 55 56struct 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 82void 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 94static 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 102static 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 124static 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; 152error: 153 dev_kfree_skb_any(skb); 154 return NULL; 155} 156 157static 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 176static 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 260repost: 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 266static int ipoib_dma_map_tx(struct ib_device *ca, 267 struct ipoib_tx_buf *tx_req) 268{ 269 struct sk_buff *skb = tx_req->skb; 270 u64 *mapping = tx_req->mapping; 271 int i; 272 int off; 273 274 if (skb_headlen(skb)) { 275 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 276 DMA_TO_DEVICE); 277 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 278 return -EIO; 279 280 off = 1; 281 } else 282 off = 0; 283 284 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 285 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 286 mapping[i + off] = ib_dma_map_page(ca, 287 skb_frag_page(frag), 288 frag->page_offset, skb_frag_size(frag), 289 DMA_TO_DEVICE); 290 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 291 goto partial_error; 292 } 293 return 0; 294 295partial_error: 296 for (; i > 0; --i) { 297 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 298 299 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); 300 } 301 302 if (off) 303 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 304 305 return -EIO; 306} 307 308static void ipoib_dma_unmap_tx(struct ib_device *ca, 309 struct ipoib_tx_buf *tx_req) 310{ 311 struct sk_buff *skb = tx_req->skb; 312 u64 *mapping = tx_req->mapping; 313 int i; 314 int off; 315 316 if (skb_headlen(skb)) { 317 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), 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(ca, mapping[i + off], skb_frag_size(frag), 326 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 */ 335static 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 371free_res: 372 kfree(qp_work); 373} 374 375static 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->ca, 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 424static 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 435int 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 445poll_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 481void 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 489static 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 503void 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 510static 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 int i, off; 518 struct sk_buff *skb = tx_req->skb; 519 skb_frag_t *frags = skb_shinfo(skb)->frags; 520 int nr_frags = skb_shinfo(skb)->nr_frags; 521 u64 *mapping = tx_req->mapping; 522 523 if (skb_headlen(skb)) { 524 priv->tx_sge[0].addr = mapping[0]; 525 priv->tx_sge[0].length = skb_headlen(skb); 526 off = 1; 527 } else 528 off = 0; 529 530 for (i = 0; i < nr_frags; ++i) { 531 priv->tx_sge[i + off].addr = mapping[i + off]; 532 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]); 533 } 534 priv->tx_wr.num_sge = nr_frags + off; 535 priv->tx_wr.wr_id = wr_id; 536 priv->tx_wr.wr.ud.remote_qpn = qpn; 537 priv->tx_wr.wr.ud.ah = address; 538 539 if (head) { 540 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size; 541 priv->tx_wr.wr.ud.header = head; 542 priv->tx_wr.wr.ud.hlen = hlen; 543 priv->tx_wr.opcode = IB_WR_LSO; 544 } else 545 priv->tx_wr.opcode = IB_WR_SEND; 546 547 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 548} 549 550void ipoib_send(struct net_device *dev, struct sk_buff *skb, 551 struct ipoib_ah *address, u32 qpn) 552{ 553 struct ipoib_dev_priv *priv = netdev_priv(dev); 554 struct ipoib_tx_buf *tx_req; 555 int hlen, rc; 556 void *phead; 557 558 if (skb_is_gso(skb)) { 559 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 560 phead = skb->data; 561 if (unlikely(!skb_pull(skb, hlen))) { 562 ipoib_warn(priv, "linear data too small\n"); 563 ++dev->stats.tx_dropped; 564 ++dev->stats.tx_errors; 565 dev_kfree_skb_any(skb); 566 return; 567 } 568 } else { 569 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 570 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 571 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 572 ++dev->stats.tx_dropped; 573 ++dev->stats.tx_errors; 574 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 575 return; 576 } 577 phead = NULL; 578 hlen = 0; 579 } 580 581 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 582 skb->len, address, qpn); 583 584 /* 585 * We put the skb into the tx_ring _before_ we call post_send() 586 * because it's entirely possible that the completion handler will 587 * run before we execute anything after the post_send(). That 588 * means we have to make sure everything is properly recorded and 589 * our state is consistent before we call post_send(). 590 */ 591 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 592 tx_req->skb = skb; 593 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 594 ++dev->stats.tx_errors; 595 dev_kfree_skb_any(skb); 596 return; 597 } 598 599 if (skb->ip_summed == CHECKSUM_PARTIAL) 600 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM; 601 else 602 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 603 604 if (++priv->tx_outstanding == ipoib_sendq_size) { 605 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 606 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 607 ipoib_warn(priv, "request notify on send CQ failed\n"); 608 netif_stop_queue(dev); 609 } 610 611 skb_orphan(skb); 612 skb_dst_drop(skb); 613 614 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 615 address->ah, qpn, tx_req, phead, hlen); 616 if (unlikely(rc)) { 617 ipoib_warn(priv, "post_send failed, error %d\n", rc); 618 ++dev->stats.tx_errors; 619 --priv->tx_outstanding; 620 ipoib_dma_unmap_tx(priv->ca, tx_req); 621 dev_kfree_skb_any(skb); 622 if (netif_queue_stopped(dev)) 623 netif_wake_queue(dev); 624 } else { 625 dev->trans_start = jiffies; 626 627 address->last_send = priv->tx_head; 628 ++priv->tx_head; 629 } 630 631 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 632 while (poll_tx(priv)) 633 ; /* nothing */ 634} 635 636static void __ipoib_reap_ah(struct net_device *dev) 637{ 638 struct ipoib_dev_priv *priv = netdev_priv(dev); 639 struct ipoib_ah *ah, *tah; 640 LIST_HEAD(remove_list); 641 unsigned long flags; 642 643 netif_tx_lock_bh(dev); 644 spin_lock_irqsave(&priv->lock, flags); 645 646 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 647 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 648 list_del(&ah->list); 649 ib_destroy_ah(ah->ah); 650 kfree(ah); 651 } 652 653 spin_unlock_irqrestore(&priv->lock, flags); 654 netif_tx_unlock_bh(dev); 655} 656 657void ipoib_reap_ah(struct work_struct *work) 658{ 659 struct ipoib_dev_priv *priv = 660 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 661 struct net_device *dev = priv->dev; 662 663 __ipoib_reap_ah(dev); 664 665 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 666 queue_delayed_work(priv->wq, &priv->ah_reap_task, 667 round_jiffies_relative(HZ)); 668} 669 670static void ipoib_flush_ah(struct net_device *dev) 671{ 672 struct ipoib_dev_priv *priv = netdev_priv(dev); 673 674 cancel_delayed_work(&priv->ah_reap_task); 675 flush_workqueue(priv->wq); 676 ipoib_reap_ah(&priv->ah_reap_task.work); 677} 678 679static void ipoib_stop_ah(struct net_device *dev) 680{ 681 struct ipoib_dev_priv *priv = netdev_priv(dev); 682 683 set_bit(IPOIB_STOP_REAPER, &priv->flags); 684 ipoib_flush_ah(dev); 685} 686 687static void ipoib_ib_tx_timer_func(unsigned long ctx) 688{ 689 drain_tx_cq((struct net_device *)ctx); 690} 691 692int ipoib_ib_dev_open(struct net_device *dev) 693{ 694 struct ipoib_dev_priv *priv = netdev_priv(dev); 695 int ret; 696 697 ipoib_pkey_dev_check_presence(dev); 698 699 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 700 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, 701 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); 702 return -1; 703 } 704 705 ret = ipoib_init_qp(dev); 706 if (ret) { 707 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 708 return -1; 709 } 710 711 ret = ipoib_ib_post_receives(dev); 712 if (ret) { 713 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 714 goto dev_stop; 715 } 716 717 ret = ipoib_cm_dev_open(dev); 718 if (ret) { 719 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 720 goto dev_stop; 721 } 722 723 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 724 queue_delayed_work(priv->wq, &priv->ah_reap_task, 725 round_jiffies_relative(HZ)); 726 727 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 728 napi_enable(&priv->napi); 729 730 return 0; 731dev_stop: 732 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 733 napi_enable(&priv->napi); 734 ipoib_ib_dev_stop(dev); 735 return -1; 736} 737 738void ipoib_pkey_dev_check_presence(struct net_device *dev) 739{ 740 struct ipoib_dev_priv *priv = netdev_priv(dev); 741 742 if (!(priv->pkey & 0x7fff) || 743 ib_find_pkey(priv->ca, priv->port, priv->pkey, 744 &priv->pkey_index)) 745 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 746 else 747 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 748} 749 750int ipoib_ib_dev_up(struct net_device *dev) 751{ 752 struct ipoib_dev_priv *priv = netdev_priv(dev); 753 754 ipoib_pkey_dev_check_presence(dev); 755 756 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 757 ipoib_dbg(priv, "PKEY is not assigned.\n"); 758 return 0; 759 } 760 761 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 762 763 return ipoib_mcast_start_thread(dev); 764} 765 766int ipoib_ib_dev_down(struct net_device *dev) 767{ 768 struct ipoib_dev_priv *priv = netdev_priv(dev); 769 770 ipoib_dbg(priv, "downing ib_dev\n"); 771 772 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 773 netif_carrier_off(dev); 774 775 ipoib_mcast_stop_thread(dev); 776 ipoib_mcast_dev_flush(dev); 777 778 ipoib_flush_paths(dev); 779 780 return 0; 781} 782 783static int recvs_pending(struct net_device *dev) 784{ 785 struct ipoib_dev_priv *priv = netdev_priv(dev); 786 int pending = 0; 787 int i; 788 789 for (i = 0; i < ipoib_recvq_size; ++i) 790 if (priv->rx_ring[i].skb) 791 ++pending; 792 793 return pending; 794} 795 796void ipoib_drain_cq(struct net_device *dev) 797{ 798 struct ipoib_dev_priv *priv = netdev_priv(dev); 799 int i, n; 800 801 /* 802 * We call completion handling routines that expect to be 803 * called from the BH-disabled NAPI poll context, so disable 804 * BHs here too. 805 */ 806 local_bh_disable(); 807 808 do { 809 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 810 for (i = 0; i < n; ++i) { 811 /* 812 * Convert any successful completions to flush 813 * errors to avoid passing packets up the 814 * stack after bringing the device down. 815 */ 816 if (priv->ibwc[i].status == IB_WC_SUCCESS) 817 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 818 819 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 820 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 821 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 822 else 823 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 824 } else 825 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 826 } 827 } while (n == IPOIB_NUM_WC); 828 829 while (poll_tx(priv)) 830 ; /* nothing */ 831 832 local_bh_enable(); 833} 834 835int ipoib_ib_dev_stop(struct net_device *dev) 836{ 837 struct ipoib_dev_priv *priv = netdev_priv(dev); 838 struct ib_qp_attr qp_attr; 839 unsigned long begin; 840 struct ipoib_tx_buf *tx_req; 841 int i; 842 843 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 844 napi_disable(&priv->napi); 845 846 ipoib_cm_dev_stop(dev); 847 848 /* 849 * Move our QP to the error state and then reinitialize in 850 * when all work requests have completed or have been flushed. 851 */ 852 qp_attr.qp_state = IB_QPS_ERR; 853 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 854 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 855 856 /* Wait for all sends and receives to complete */ 857 begin = jiffies; 858 859 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 860 if (time_after(jiffies, begin + 5 * HZ)) { 861 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 862 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 863 864 /* 865 * assume the HW is wedged and just free up 866 * all our pending work requests. 867 */ 868 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 869 tx_req = &priv->tx_ring[priv->tx_tail & 870 (ipoib_sendq_size - 1)]; 871 ipoib_dma_unmap_tx(priv->ca, tx_req); 872 dev_kfree_skb_any(tx_req->skb); 873 ++priv->tx_tail; 874 --priv->tx_outstanding; 875 } 876 877 for (i = 0; i < ipoib_recvq_size; ++i) { 878 struct ipoib_rx_buf *rx_req; 879 880 rx_req = &priv->rx_ring[i]; 881 if (!rx_req->skb) 882 continue; 883 ipoib_ud_dma_unmap_rx(priv, 884 priv->rx_ring[i].mapping); 885 dev_kfree_skb_any(rx_req->skb); 886 rx_req->skb = NULL; 887 } 888 889 goto timeout; 890 } 891 892 ipoib_drain_cq(dev); 893 894 msleep(1); 895 } 896 897 ipoib_dbg(priv, "All sends and receives done.\n"); 898 899timeout: 900 del_timer_sync(&priv->poll_timer); 901 qp_attr.qp_state = IB_QPS_RESET; 902 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 903 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 904 905 ipoib_flush_ah(dev); 906 907 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 908 909 return 0; 910} 911 912int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 913{ 914 struct ipoib_dev_priv *priv = netdev_priv(dev); 915 916 priv->ca = ca; 917 priv->port = port; 918 priv->qp = NULL; 919 920 if (ipoib_transport_dev_init(dev, ca)) { 921 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 922 return -ENODEV; 923 } 924 925 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 926 (unsigned long) dev); 927 928 if (dev->flags & IFF_UP) { 929 if (ipoib_ib_dev_open(dev)) { 930 ipoib_transport_dev_cleanup(dev); 931 return -ENODEV; 932 } 933 } 934 935 return 0; 936} 937 938/* 939 * Takes whatever value which is in pkey index 0 and updates priv->pkey 940 * returns 0 if the pkey value was changed. 941 */ 942static inline int update_parent_pkey(struct ipoib_dev_priv *priv) 943{ 944 int result; 945 u16 prev_pkey; 946 947 prev_pkey = priv->pkey; 948 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 949 if (result) { 950 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n", 951 priv->port, result); 952 return result; 953 } 954 955 priv->pkey |= 0x8000; 956 957 if (prev_pkey != priv->pkey) { 958 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n", 959 prev_pkey, priv->pkey); 960 /* 961 * Update the pkey in the broadcast address, while making sure to set 962 * the full membership bit, so that we join the right broadcast group. 963 */ 964 priv->dev->broadcast[8] = priv->pkey >> 8; 965 priv->dev->broadcast[9] = priv->pkey & 0xff; 966 return 0; 967 } 968 969 return 1; 970} 971/* 972 * returns 0 if pkey value was found in a different slot. 973 */ 974static inline int update_child_pkey(struct ipoib_dev_priv *priv) 975{ 976 u16 old_index = priv->pkey_index; 977 978 priv->pkey_index = 0; 979 ipoib_pkey_dev_check_presence(priv->dev); 980 981 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 982 (old_index == priv->pkey_index)) 983 return 1; 984 return 0; 985} 986 987static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 988 enum ipoib_flush_level level) 989{ 990 struct ipoib_dev_priv *cpriv; 991 struct net_device *dev = priv->dev; 992 int result; 993 994 down_read(&priv->vlan_rwsem); 995 996 /* 997 * Flush any child interfaces too -- they might be up even if 998 * the parent is down. 999 */ 1000 list_for_each_entry(cpriv, &priv->child_intfs, list) 1001 __ipoib_ib_dev_flush(cpriv, level); 1002 1003 up_read(&priv->vlan_rwsem); 1004 1005 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && 1006 level != IPOIB_FLUSH_HEAVY) { 1007 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 1008 return; 1009 } 1010 1011 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1012 /* interface is down. update pkey and leave. */ 1013 if (level == IPOIB_FLUSH_HEAVY) { 1014 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1015 update_parent_pkey(priv); 1016 else 1017 update_child_pkey(priv); 1018 } 1019 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 1020 return; 1021 } 1022 1023 if (level == IPOIB_FLUSH_HEAVY) { 1024 /* child devices chase their origin pkey value, while non-child 1025 * (parent) devices should always takes what present in pkey index 0 1026 */ 1027 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 1028 result = update_child_pkey(priv); 1029 if (result) { 1030 /* restart QP only if P_Key index is changed */ 1031 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 1032 return; 1033 } 1034 1035 } else { 1036 result = update_parent_pkey(priv); 1037 /* restart QP only if P_Key value changed */ 1038 if (result) { 1039 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n"); 1040 return; 1041 } 1042 } 1043 } 1044 1045 if (level == IPOIB_FLUSH_LIGHT) { 1046 ipoib_mark_paths_invalid(dev); 1047 ipoib_mcast_dev_flush(dev); 1048 ipoib_flush_ah(dev); 1049 } 1050 1051 if (level >= IPOIB_FLUSH_NORMAL) 1052 ipoib_ib_dev_down(dev); 1053 1054 if (level == IPOIB_FLUSH_HEAVY) { 1055 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 1056 ipoib_ib_dev_stop(dev); 1057 if (ipoib_ib_dev_open(dev) != 0) 1058 return; 1059 if (netif_queue_stopped(dev)) 1060 netif_start_queue(dev); 1061 } 1062 1063 /* 1064 * The device could have been brought down between the start and when 1065 * we get here, don't bring it back up if it's not configured up 1066 */ 1067 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1068 if (level >= IPOIB_FLUSH_NORMAL) 1069 ipoib_ib_dev_up(dev); 1070 ipoib_mcast_restart_task(&priv->restart_task); 1071 } 1072} 1073 1074void ipoib_ib_dev_flush_light(struct work_struct *work) 1075{ 1076 struct ipoib_dev_priv *priv = 1077 container_of(work, struct ipoib_dev_priv, flush_light); 1078 1079 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT); 1080} 1081 1082void ipoib_ib_dev_flush_normal(struct work_struct *work) 1083{ 1084 struct ipoib_dev_priv *priv = 1085 container_of(work, struct ipoib_dev_priv, flush_normal); 1086 1087 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL); 1088} 1089 1090void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1091{ 1092 struct ipoib_dev_priv *priv = 1093 container_of(work, struct ipoib_dev_priv, flush_heavy); 1094 1095 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY); 1096} 1097 1098void ipoib_ib_dev_cleanup(struct net_device *dev) 1099{ 1100 struct ipoib_dev_priv *priv = netdev_priv(dev); 1101 1102 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1103 /* 1104 * We must make sure there are no more (path) completions 1105 * that may wish to touch priv fields that are no longer valid 1106 */ 1107 ipoib_flush_paths(dev); 1108 1109 ipoib_mcast_stop_thread(dev); 1110 ipoib_mcast_dev_flush(dev); 1111 1112 /* 1113 * All of our ah references aren't free until after 1114 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and 1115 * the neighbor garbage collection is stopped and reaped. 1116 * That should all be done now, so make a final ah flush. 1117 */ 1118 ipoib_stop_ah(dev); 1119 1120 ipoib_transport_dev_cleanup(dev); 1121} 1122 1123 1124