1 /* 2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <rdma/ib_cm.h> 34 #include <net/dst.h> 35 #include <net/icmp.h> 36 #include <linux/icmpv6.h> 37 #include <linux/delay.h> 38 #include <linux/slab.h> 39 #include <linux/vmalloc.h> 40 #include <linux/moduleparam.h> 41 42 #include "ipoib.h" 43 44 int ipoib_max_conn_qp = 128; 45 46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 47 MODULE_PARM_DESC(max_nonsrq_conn_qp, 48 "Max number of connected-mode QPs per interface " 49 "(applied only if shared receive queue is not available)"); 50 51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 52 static int data_debug_level; 53 54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 55 MODULE_PARM_DESC(cm_data_debug_level, 56 "Enable data path debug tracing for connected mode if > 0"); 57 #endif 58 59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 60 61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 62 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 63 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 64 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 65 66 static struct ib_qp_attr ipoib_cm_err_attr = { 67 .qp_state = IB_QPS_ERR 68 }; 69 70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 71 72 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 73 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 74 .opcode = IB_WR_SEND, 75 }; 76 77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 78 struct ib_cm_event *event); 79 80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 81 u64 mapping[IPOIB_CM_RX_SG]) 82 { 83 int i; 84 85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 86 87 for (i = 0; i < frags; ++i) 88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 89 } 90 91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 92 { 93 struct ipoib_dev_priv *priv = netdev_priv(dev); 94 struct ib_recv_wr *bad_wr; 95 int i, ret; 96 97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 98 99 for (i = 0; i < priv->cm.num_frags; ++i) 100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 101 102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 103 if (unlikely(ret)) { 104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 106 priv->cm.srq_ring[id].mapping); 107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 108 priv->cm.srq_ring[id].skb = NULL; 109 } 110 111 return ret; 112 } 113 114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 115 struct ipoib_cm_rx *rx, 116 struct ib_recv_wr *wr, 117 struct ib_sge *sge, int id) 118 { 119 struct ipoib_dev_priv *priv = netdev_priv(dev); 120 struct ib_recv_wr *bad_wr; 121 int i, ret; 122 123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 124 125 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 126 sge[i].addr = rx->rx_ring[id].mapping[i]; 127 128 ret = ib_post_recv(rx->qp, wr, &bad_wr); 129 if (unlikely(ret)) { 130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 132 rx->rx_ring[id].mapping); 133 dev_kfree_skb_any(rx->rx_ring[id].skb); 134 rx->rx_ring[id].skb = NULL; 135 } 136 137 return ret; 138 } 139 140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 141 struct ipoib_cm_rx_buf *rx_ring, 142 int id, int frags, 143 u64 mapping[IPOIB_CM_RX_SG], 144 gfp_t gfp) 145 { 146 struct ipoib_dev_priv *priv = netdev_priv(dev); 147 struct sk_buff *skb; 148 int i; 149 150 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 151 if (unlikely(!skb)) 152 return NULL; 153 154 /* 155 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 156 * IP header to a multiple of 16. 157 */ 158 skb_reserve(skb, 12); 159 160 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 161 DMA_FROM_DEVICE); 162 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 163 dev_kfree_skb_any(skb); 164 return NULL; 165 } 166 167 for (i = 0; i < frags; i++) { 168 struct page *page = alloc_page(gfp); 169 170 if (!page) 171 goto partial_error; 172 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 173 174 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 175 0, PAGE_SIZE, DMA_FROM_DEVICE); 176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 177 goto partial_error; 178 } 179 180 rx_ring[id].skb = skb; 181 return skb; 182 183 partial_error: 184 185 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 186 187 for (; i > 0; --i) 188 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 189 190 dev_kfree_skb_any(skb); 191 return NULL; 192 } 193 194 static void ipoib_cm_free_rx_ring(struct net_device *dev, 195 struct ipoib_cm_rx_buf *rx_ring) 196 { 197 struct ipoib_dev_priv *priv = netdev_priv(dev); 198 int i; 199 200 for (i = 0; i < ipoib_recvq_size; ++i) 201 if (rx_ring[i].skb) { 202 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 203 rx_ring[i].mapping); 204 dev_kfree_skb_any(rx_ring[i].skb); 205 } 206 207 vfree(rx_ring); 208 } 209 210 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 211 { 212 struct ib_send_wr *bad_wr; 213 struct ipoib_cm_rx *p; 214 215 /* We only reserved 1 extra slot in CQ for drain WRs, so 216 * make sure we have at most 1 outstanding WR. */ 217 if (list_empty(&priv->cm.rx_flush_list) || 218 !list_empty(&priv->cm.rx_drain_list)) 219 return; 220 221 /* 222 * QPs on flush list are error state. This way, a "flush 223 * error" WC will be immediately generated for each WR we post. 224 */ 225 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 226 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 227 ipoib_warn(priv, "failed to post drain wr\n"); 228 229 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 230 } 231 232 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 233 { 234 struct ipoib_cm_rx *p = ctx; 235 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 236 unsigned long flags; 237 238 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 239 return; 240 241 spin_lock_irqsave(&priv->lock, flags); 242 list_move(&p->list, &priv->cm.rx_flush_list); 243 p->state = IPOIB_CM_RX_FLUSH; 244 ipoib_cm_start_rx_drain(priv); 245 spin_unlock_irqrestore(&priv->lock, flags); 246 } 247 248 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 249 struct ipoib_cm_rx *p) 250 { 251 struct ipoib_dev_priv *priv = netdev_priv(dev); 252 struct ib_qp_init_attr attr = { 253 .event_handler = ipoib_cm_rx_event_handler, 254 .send_cq = priv->recv_cq, /* For drain WR */ 255 .recv_cq = priv->recv_cq, 256 .srq = priv->cm.srq, 257 .cap.max_send_wr = 1, /* For drain WR */ 258 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 259 .sq_sig_type = IB_SIGNAL_ALL_WR, 260 .qp_type = IB_QPT_RC, 261 .qp_context = p, 262 }; 263 264 if (!ipoib_cm_has_srq(dev)) { 265 attr.cap.max_recv_wr = ipoib_recvq_size; 266 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 267 } 268 269 return ib_create_qp(priv->pd, &attr); 270 } 271 272 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 273 struct ib_cm_id *cm_id, struct ib_qp *qp, 274 unsigned psn) 275 { 276 struct ipoib_dev_priv *priv = netdev_priv(dev); 277 struct ib_qp_attr qp_attr; 278 int qp_attr_mask, ret; 279 280 qp_attr.qp_state = IB_QPS_INIT; 281 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 282 if (ret) { 283 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 284 return ret; 285 } 286 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 287 if (ret) { 288 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 289 return ret; 290 } 291 qp_attr.qp_state = IB_QPS_RTR; 292 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 293 if (ret) { 294 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 295 return ret; 296 } 297 qp_attr.rq_psn = psn; 298 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 299 if (ret) { 300 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 301 return ret; 302 } 303 304 /* 305 * Current Mellanox HCA firmware won't generate completions 306 * with error for drain WRs unless the QP has been moved to 307 * RTS first. This work-around leaves a window where a QP has 308 * moved to error asynchronously, but this will eventually get 309 * fixed in firmware, so let's not error out if modify QP 310 * fails. 311 */ 312 qp_attr.qp_state = IB_QPS_RTS; 313 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 314 if (ret) { 315 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 316 return 0; 317 } 318 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 319 if (ret) { 320 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 321 return 0; 322 } 323 324 return 0; 325 } 326 327 static void ipoib_cm_init_rx_wr(struct net_device *dev, 328 struct ib_recv_wr *wr, 329 struct ib_sge *sge) 330 { 331 struct ipoib_dev_priv *priv = netdev_priv(dev); 332 int i; 333 334 for (i = 0; i < priv->cm.num_frags; ++i) 335 sge[i].lkey = priv->pd->local_dma_lkey; 336 337 sge[0].length = IPOIB_CM_HEAD_SIZE; 338 for (i = 1; i < priv->cm.num_frags; ++i) 339 sge[i].length = PAGE_SIZE; 340 341 wr->next = NULL; 342 wr->sg_list = sge; 343 wr->num_sge = priv->cm.num_frags; 344 } 345 346 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 347 struct ipoib_cm_rx *rx) 348 { 349 struct ipoib_dev_priv *priv = netdev_priv(dev); 350 struct { 351 struct ib_recv_wr wr; 352 struct ib_sge sge[IPOIB_CM_RX_SG]; 353 } *t; 354 int ret; 355 int i; 356 357 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 358 if (!rx->rx_ring) { 359 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 360 priv->ca->name, ipoib_recvq_size); 361 return -ENOMEM; 362 } 363 364 t = kmalloc(sizeof *t, GFP_KERNEL); 365 if (!t) { 366 ret = -ENOMEM; 367 goto err_free; 368 } 369 370 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 371 372 spin_lock_irq(&priv->lock); 373 374 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 375 spin_unlock_irq(&priv->lock); 376 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 377 ret = -EINVAL; 378 goto err_free; 379 } else 380 ++priv->cm.nonsrq_conn_qp; 381 382 spin_unlock_irq(&priv->lock); 383 384 for (i = 0; i < ipoib_recvq_size; ++i) { 385 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 386 rx->rx_ring[i].mapping, 387 GFP_KERNEL)) { 388 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 389 ret = -ENOMEM; 390 goto err_count; 391 } 392 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 393 if (ret) { 394 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 395 "failed for buf %d\n", i); 396 ret = -EIO; 397 goto err_count; 398 } 399 } 400 401 rx->recv_count = ipoib_recvq_size; 402 403 kfree(t); 404 405 return 0; 406 407 err_count: 408 spin_lock_irq(&priv->lock); 409 --priv->cm.nonsrq_conn_qp; 410 spin_unlock_irq(&priv->lock); 411 412 err_free: 413 kfree(t); 414 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 415 416 return ret; 417 } 418 419 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 420 struct ib_qp *qp, struct ib_cm_req_event_param *req, 421 unsigned psn) 422 { 423 struct ipoib_dev_priv *priv = netdev_priv(dev); 424 struct ipoib_cm_data data = {}; 425 struct ib_cm_rep_param rep = {}; 426 427 data.qpn = cpu_to_be32(priv->qp->qp_num); 428 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 429 430 rep.private_data = &data; 431 rep.private_data_len = sizeof data; 432 rep.flow_control = 0; 433 rep.rnr_retry_count = req->rnr_retry_count; 434 rep.srq = ipoib_cm_has_srq(dev); 435 rep.qp_num = qp->qp_num; 436 rep.starting_psn = psn; 437 return ib_send_cm_rep(cm_id, &rep); 438 } 439 440 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 441 { 442 struct net_device *dev = cm_id->context; 443 struct ipoib_dev_priv *priv = netdev_priv(dev); 444 struct ipoib_cm_rx *p; 445 unsigned psn; 446 int ret; 447 448 ipoib_dbg(priv, "REQ arrived\n"); 449 p = kzalloc(sizeof *p, GFP_KERNEL); 450 if (!p) 451 return -ENOMEM; 452 p->dev = dev; 453 p->id = cm_id; 454 cm_id->context = p; 455 p->state = IPOIB_CM_RX_LIVE; 456 p->jiffies = jiffies; 457 INIT_LIST_HEAD(&p->list); 458 459 p->qp = ipoib_cm_create_rx_qp(dev, p); 460 if (IS_ERR(p->qp)) { 461 ret = PTR_ERR(p->qp); 462 goto err_qp; 463 } 464 465 psn = prandom_u32() & 0xffffff; 466 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 467 if (ret) 468 goto err_modify; 469 470 if (!ipoib_cm_has_srq(dev)) { 471 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 472 if (ret) 473 goto err_modify; 474 } 475 476 spin_lock_irq(&priv->lock); 477 queue_delayed_work(priv->wq, 478 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 479 /* Add this entry to passive ids list head, but do not re-add it 480 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 481 p->jiffies = jiffies; 482 if (p->state == IPOIB_CM_RX_LIVE) 483 list_move(&p->list, &priv->cm.passive_ids); 484 spin_unlock_irq(&priv->lock); 485 486 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 487 if (ret) { 488 ipoib_warn(priv, "failed to send REP: %d\n", ret); 489 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 490 ipoib_warn(priv, "unable to move qp to error state\n"); 491 } 492 return 0; 493 494 err_modify: 495 ib_destroy_qp(p->qp); 496 err_qp: 497 kfree(p); 498 return ret; 499 } 500 501 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 502 struct ib_cm_event *event) 503 { 504 struct ipoib_cm_rx *p; 505 struct ipoib_dev_priv *priv; 506 507 switch (event->event) { 508 case IB_CM_REQ_RECEIVED: 509 return ipoib_cm_req_handler(cm_id, event); 510 case IB_CM_DREQ_RECEIVED: 511 p = cm_id->context; 512 ib_send_cm_drep(cm_id, NULL, 0); 513 /* Fall through */ 514 case IB_CM_REJ_RECEIVED: 515 p = cm_id->context; 516 priv = netdev_priv(p->dev); 517 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 518 ipoib_warn(priv, "unable to move qp to error state\n"); 519 /* Fall through */ 520 default: 521 return 0; 522 } 523 } 524 /* Adjust length of skb with fragments to match received data */ 525 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 526 unsigned int length, struct sk_buff *toskb) 527 { 528 int i, num_frags; 529 unsigned int size; 530 531 /* put header into skb */ 532 size = min(length, hdr_space); 533 skb->tail += size; 534 skb->len += size; 535 length -= size; 536 537 num_frags = skb_shinfo(skb)->nr_frags; 538 for (i = 0; i < num_frags; i++) { 539 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 540 541 if (length == 0) { 542 /* don't need this page */ 543 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 544 0, PAGE_SIZE); 545 --skb_shinfo(skb)->nr_frags; 546 } else { 547 size = min(length, (unsigned) PAGE_SIZE); 548 549 skb_frag_size_set(frag, size); 550 skb->data_len += size; 551 skb->truesize += size; 552 skb->len += size; 553 length -= size; 554 } 555 } 556 } 557 558 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 559 { 560 struct ipoib_dev_priv *priv = netdev_priv(dev); 561 struct ipoib_cm_rx_buf *rx_ring; 562 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 563 struct sk_buff *skb, *newskb; 564 struct ipoib_cm_rx *p; 565 unsigned long flags; 566 u64 mapping[IPOIB_CM_RX_SG]; 567 int frags; 568 int has_srq; 569 struct sk_buff *small_skb; 570 571 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 572 wr_id, wc->status); 573 574 if (unlikely(wr_id >= ipoib_recvq_size)) { 575 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 576 spin_lock_irqsave(&priv->lock, flags); 577 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 578 ipoib_cm_start_rx_drain(priv); 579 queue_work(priv->wq, &priv->cm.rx_reap_task); 580 spin_unlock_irqrestore(&priv->lock, flags); 581 } else 582 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 583 wr_id, ipoib_recvq_size); 584 return; 585 } 586 587 p = wc->qp->qp_context; 588 589 has_srq = ipoib_cm_has_srq(dev); 590 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 591 592 skb = rx_ring[wr_id].skb; 593 594 if (unlikely(wc->status != IB_WC_SUCCESS)) { 595 ipoib_dbg(priv, "cm recv error " 596 "(status=%d, wrid=%d vend_err %x)\n", 597 wc->status, wr_id, wc->vendor_err); 598 ++dev->stats.rx_dropped; 599 if (has_srq) 600 goto repost; 601 else { 602 if (!--p->recv_count) { 603 spin_lock_irqsave(&priv->lock, flags); 604 list_move(&p->list, &priv->cm.rx_reap_list); 605 spin_unlock_irqrestore(&priv->lock, flags); 606 queue_work(priv->wq, &priv->cm.rx_reap_task); 607 } 608 return; 609 } 610 } 611 612 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 613 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 614 spin_lock_irqsave(&priv->lock, flags); 615 p->jiffies = jiffies; 616 /* Move this entry to list head, but do not re-add it 617 * if it has been moved out of list. */ 618 if (p->state == IPOIB_CM_RX_LIVE) 619 list_move(&p->list, &priv->cm.passive_ids); 620 spin_unlock_irqrestore(&priv->lock, flags); 621 } 622 } 623 624 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 625 int dlen = wc->byte_len; 626 627 small_skb = dev_alloc_skb(dlen + 12); 628 if (small_skb) { 629 skb_reserve(small_skb, 12); 630 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 631 dlen, DMA_FROM_DEVICE); 632 skb_copy_from_linear_data(skb, small_skb->data, dlen); 633 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 634 dlen, DMA_FROM_DEVICE); 635 skb_put(small_skb, dlen); 636 skb = small_skb; 637 goto copied; 638 } 639 } 640 641 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 642 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 643 644 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, 645 mapping, GFP_ATOMIC); 646 if (unlikely(!newskb)) { 647 /* 648 * If we can't allocate a new RX buffer, dump 649 * this packet and reuse the old buffer. 650 */ 651 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 652 ++dev->stats.rx_dropped; 653 goto repost; 654 } 655 656 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 657 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 658 659 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 660 wc->byte_len, wc->slid); 661 662 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 663 664 copied: 665 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 666 skb_reset_mac_header(skb); 667 skb_pull(skb, IPOIB_ENCAP_LEN); 668 669 ++dev->stats.rx_packets; 670 dev->stats.rx_bytes += skb->len; 671 672 skb->dev = dev; 673 /* XXX get correct PACKET_ type here */ 674 skb->pkt_type = PACKET_HOST; 675 netif_receive_skb(skb); 676 677 repost: 678 if (has_srq) { 679 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 680 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 681 "for buf %d\n", wr_id); 682 } else { 683 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 684 &priv->cm.rx_wr, 685 priv->cm.rx_sge, 686 wr_id))) { 687 --p->recv_count; 688 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 689 "for buf %d\n", wr_id); 690 } 691 } 692 } 693 694 static inline int post_send(struct ipoib_dev_priv *priv, 695 struct ipoib_cm_tx *tx, 696 unsigned int wr_id, 697 struct ipoib_tx_buf *tx_req) 698 { 699 struct ib_send_wr *bad_wr; 700 701 ipoib_build_sge(priv, tx_req); 702 703 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 704 705 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); 706 } 707 708 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 709 { 710 struct ipoib_dev_priv *priv = netdev_priv(dev); 711 struct ipoib_tx_buf *tx_req; 712 int rc; 713 714 if (unlikely(skb->len > tx->mtu)) { 715 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 716 skb->len, tx->mtu); 717 ++dev->stats.tx_dropped; 718 ++dev->stats.tx_errors; 719 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 720 return; 721 } 722 723 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 724 tx->tx_head, skb->len, tx->qp->qp_num); 725 726 /* 727 * We put the skb into the tx_ring _before_ we call post_send() 728 * because it's entirely possible that the completion handler will 729 * run before we execute anything after the post_send(). That 730 * means we have to make sure everything is properly recorded and 731 * our state is consistent before we call post_send(). 732 */ 733 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 734 tx_req->skb = skb; 735 736 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 737 ++dev->stats.tx_errors; 738 dev_kfree_skb_any(skb); 739 return; 740 } 741 742 skb_orphan(skb); 743 skb_dst_drop(skb); 744 745 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req); 746 if (unlikely(rc)) { 747 ipoib_warn(priv, "post_send failed, error %d\n", rc); 748 ++dev->stats.tx_errors; 749 ipoib_dma_unmap_tx(priv, tx_req); 750 dev_kfree_skb_any(skb); 751 } else { 752 dev->trans_start = jiffies; 753 ++tx->tx_head; 754 755 if (++priv->tx_outstanding == ipoib_sendq_size) { 756 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 757 tx->qp->qp_num); 758 netif_stop_queue(dev); 759 rc = ib_req_notify_cq(priv->send_cq, 760 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 761 if (rc < 0) 762 ipoib_warn(priv, "request notify on send CQ failed\n"); 763 else if (rc) 764 ipoib_send_comp_handler(priv->send_cq, dev); 765 } 766 } 767 } 768 769 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 770 { 771 struct ipoib_dev_priv *priv = netdev_priv(dev); 772 struct ipoib_cm_tx *tx = wc->qp->qp_context; 773 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 774 struct ipoib_tx_buf *tx_req; 775 unsigned long flags; 776 777 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 778 wr_id, wc->status); 779 780 if (unlikely(wr_id >= ipoib_sendq_size)) { 781 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 782 wr_id, ipoib_sendq_size); 783 return; 784 } 785 786 tx_req = &tx->tx_ring[wr_id]; 787 788 ipoib_dma_unmap_tx(priv, tx_req); 789 790 /* FIXME: is this right? Shouldn't we only increment on success? */ 791 ++dev->stats.tx_packets; 792 dev->stats.tx_bytes += tx_req->skb->len; 793 794 dev_kfree_skb_any(tx_req->skb); 795 796 netif_tx_lock(dev); 797 798 ++tx->tx_tail; 799 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 800 netif_queue_stopped(dev) && 801 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 802 netif_wake_queue(dev); 803 804 if (wc->status != IB_WC_SUCCESS && 805 wc->status != IB_WC_WR_FLUSH_ERR) { 806 struct ipoib_neigh *neigh; 807 808 ipoib_dbg(priv, "failed cm send event " 809 "(status=%d, wrid=%d vend_err %x)\n", 810 wc->status, wr_id, wc->vendor_err); 811 812 spin_lock_irqsave(&priv->lock, flags); 813 neigh = tx->neigh; 814 815 if (neigh) { 816 neigh->cm = NULL; 817 ipoib_neigh_free(neigh); 818 819 tx->neigh = NULL; 820 } 821 822 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 823 list_move(&tx->list, &priv->cm.reap_list); 824 queue_work(priv->wq, &priv->cm.reap_task); 825 } 826 827 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 828 829 spin_unlock_irqrestore(&priv->lock, flags); 830 } 831 832 netif_tx_unlock(dev); 833 } 834 835 int ipoib_cm_dev_open(struct net_device *dev) 836 { 837 struct ipoib_dev_priv *priv = netdev_priv(dev); 838 int ret; 839 840 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 841 return 0; 842 843 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 844 if (IS_ERR(priv->cm.id)) { 845 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 846 ret = PTR_ERR(priv->cm.id); 847 goto err_cm; 848 } 849 850 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 851 0); 852 if (ret) { 853 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 854 IPOIB_CM_IETF_ID | priv->qp->qp_num); 855 goto err_listen; 856 } 857 858 return 0; 859 860 err_listen: 861 ib_destroy_cm_id(priv->cm.id); 862 err_cm: 863 priv->cm.id = NULL; 864 return ret; 865 } 866 867 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 868 { 869 struct ipoib_dev_priv *priv = netdev_priv(dev); 870 struct ipoib_cm_rx *rx, *n; 871 LIST_HEAD(list); 872 873 spin_lock_irq(&priv->lock); 874 list_splice_init(&priv->cm.rx_reap_list, &list); 875 spin_unlock_irq(&priv->lock); 876 877 list_for_each_entry_safe(rx, n, &list, list) { 878 ib_destroy_cm_id(rx->id); 879 ib_destroy_qp(rx->qp); 880 if (!ipoib_cm_has_srq(dev)) { 881 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 882 spin_lock_irq(&priv->lock); 883 --priv->cm.nonsrq_conn_qp; 884 spin_unlock_irq(&priv->lock); 885 } 886 kfree(rx); 887 } 888 } 889 890 void ipoib_cm_dev_stop(struct net_device *dev) 891 { 892 struct ipoib_dev_priv *priv = netdev_priv(dev); 893 struct ipoib_cm_rx *p; 894 unsigned long begin; 895 int ret; 896 897 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 898 return; 899 900 ib_destroy_cm_id(priv->cm.id); 901 priv->cm.id = NULL; 902 903 spin_lock_irq(&priv->lock); 904 while (!list_empty(&priv->cm.passive_ids)) { 905 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 906 list_move(&p->list, &priv->cm.rx_error_list); 907 p->state = IPOIB_CM_RX_ERROR; 908 spin_unlock_irq(&priv->lock); 909 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 910 if (ret) 911 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 912 spin_lock_irq(&priv->lock); 913 } 914 915 /* Wait for all RX to be drained */ 916 begin = jiffies; 917 918 while (!list_empty(&priv->cm.rx_error_list) || 919 !list_empty(&priv->cm.rx_flush_list) || 920 !list_empty(&priv->cm.rx_drain_list)) { 921 if (time_after(jiffies, begin + 5 * HZ)) { 922 ipoib_warn(priv, "RX drain timing out\n"); 923 924 /* 925 * assume the HW is wedged and just free up everything. 926 */ 927 list_splice_init(&priv->cm.rx_flush_list, 928 &priv->cm.rx_reap_list); 929 list_splice_init(&priv->cm.rx_error_list, 930 &priv->cm.rx_reap_list); 931 list_splice_init(&priv->cm.rx_drain_list, 932 &priv->cm.rx_reap_list); 933 break; 934 } 935 spin_unlock_irq(&priv->lock); 936 msleep(1); 937 ipoib_drain_cq(dev); 938 spin_lock_irq(&priv->lock); 939 } 940 941 spin_unlock_irq(&priv->lock); 942 943 ipoib_cm_free_rx_reap_list(dev); 944 945 cancel_delayed_work(&priv->cm.stale_task); 946 } 947 948 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 949 { 950 struct ipoib_cm_tx *p = cm_id->context; 951 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 952 struct ipoib_cm_data *data = event->private_data; 953 struct sk_buff_head skqueue; 954 struct ib_qp_attr qp_attr; 955 int qp_attr_mask, ret; 956 struct sk_buff *skb; 957 958 p->mtu = be32_to_cpu(data->mtu); 959 960 if (p->mtu <= IPOIB_ENCAP_LEN) { 961 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 962 p->mtu, IPOIB_ENCAP_LEN); 963 return -EINVAL; 964 } 965 966 qp_attr.qp_state = IB_QPS_RTR; 967 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 968 if (ret) { 969 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 970 return ret; 971 } 972 973 qp_attr.rq_psn = 0 /* FIXME */; 974 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 975 if (ret) { 976 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 977 return ret; 978 } 979 980 qp_attr.qp_state = IB_QPS_RTS; 981 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 982 if (ret) { 983 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 984 return ret; 985 } 986 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 987 if (ret) { 988 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 989 return ret; 990 } 991 992 skb_queue_head_init(&skqueue); 993 994 spin_lock_irq(&priv->lock); 995 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 996 if (p->neigh) 997 while ((skb = __skb_dequeue(&p->neigh->queue))) 998 __skb_queue_tail(&skqueue, skb); 999 spin_unlock_irq(&priv->lock); 1000 1001 while ((skb = __skb_dequeue(&skqueue))) { 1002 skb->dev = p->dev; 1003 if (dev_queue_xmit(skb)) 1004 ipoib_warn(priv, "dev_queue_xmit failed " 1005 "to requeue packet\n"); 1006 } 1007 1008 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1009 if (ret) { 1010 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1011 return ret; 1012 } 1013 return 0; 1014 } 1015 1016 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1017 { 1018 struct ipoib_dev_priv *priv = netdev_priv(dev); 1019 struct ib_qp_init_attr attr = { 1020 .send_cq = priv->recv_cq, 1021 .recv_cq = priv->recv_cq, 1022 .srq = priv->cm.srq, 1023 .cap.max_send_wr = ipoib_sendq_size, 1024 .cap.max_send_sge = 1, 1025 .sq_sig_type = IB_SIGNAL_ALL_WR, 1026 .qp_type = IB_QPT_RC, 1027 .qp_context = tx, 1028 .create_flags = IB_QP_CREATE_USE_GFP_NOIO 1029 }; 1030 1031 struct ib_qp *tx_qp; 1032 1033 if (dev->features & NETIF_F_SG) 1034 attr.cap.max_send_sge = MAX_SKB_FRAGS + 1; 1035 1036 tx_qp = ib_create_qp(priv->pd, &attr); 1037 if (PTR_ERR(tx_qp) == -EINVAL) { 1038 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n", 1039 priv->ca->name); 1040 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO; 1041 tx_qp = ib_create_qp(priv->pd, &attr); 1042 } 1043 return tx_qp; 1044 } 1045 1046 static int ipoib_cm_send_req(struct net_device *dev, 1047 struct ib_cm_id *id, struct ib_qp *qp, 1048 u32 qpn, 1049 struct ib_sa_path_rec *pathrec) 1050 { 1051 struct ipoib_dev_priv *priv = netdev_priv(dev); 1052 struct ipoib_cm_data data = {}; 1053 struct ib_cm_req_param req = {}; 1054 1055 data.qpn = cpu_to_be32(priv->qp->qp_num); 1056 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1057 1058 req.primary_path = pathrec; 1059 req.alternate_path = NULL; 1060 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1061 req.qp_num = qp->qp_num; 1062 req.qp_type = qp->qp_type; 1063 req.private_data = &data; 1064 req.private_data_len = sizeof data; 1065 req.flow_control = 0; 1066 1067 req.starting_psn = 0; /* FIXME */ 1068 1069 /* 1070 * Pick some arbitrary defaults here; we could make these 1071 * module parameters if anyone cared about setting them. 1072 */ 1073 req.responder_resources = 4; 1074 req.remote_cm_response_timeout = 20; 1075 req.local_cm_response_timeout = 20; 1076 req.retry_count = 0; /* RFC draft warns against retries */ 1077 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1078 req.max_cm_retries = 15; 1079 req.srq = ipoib_cm_has_srq(dev); 1080 return ib_send_cm_req(id, &req); 1081 } 1082 1083 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1084 struct ib_cm_id *cm_id, struct ib_qp *qp) 1085 { 1086 struct ipoib_dev_priv *priv = netdev_priv(dev); 1087 struct ib_qp_attr qp_attr; 1088 int qp_attr_mask, ret; 1089 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1090 if (ret) { 1091 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1092 return ret; 1093 } 1094 1095 qp_attr.qp_state = IB_QPS_INIT; 1096 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1097 qp_attr.port_num = priv->port; 1098 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1099 1100 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1101 if (ret) { 1102 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1103 return ret; 1104 } 1105 return 0; 1106 } 1107 1108 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1109 struct ib_sa_path_rec *pathrec) 1110 { 1111 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1112 int ret; 1113 1114 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring, 1115 GFP_NOIO, PAGE_KERNEL); 1116 if (!p->tx_ring) { 1117 ipoib_warn(priv, "failed to allocate tx ring\n"); 1118 ret = -ENOMEM; 1119 goto err_tx; 1120 } 1121 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1122 1123 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1124 if (IS_ERR(p->qp)) { 1125 ret = PTR_ERR(p->qp); 1126 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1127 goto err_qp; 1128 } 1129 1130 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1131 if (IS_ERR(p->id)) { 1132 ret = PTR_ERR(p->id); 1133 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1134 goto err_id; 1135 } 1136 1137 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1138 if (ret) { 1139 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1140 goto err_modify; 1141 } 1142 1143 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1144 if (ret) { 1145 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1146 goto err_send_cm; 1147 } 1148 1149 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1150 p->qp->qp_num, pathrec->dgid.raw, qpn); 1151 1152 return 0; 1153 1154 err_send_cm: 1155 err_modify: 1156 ib_destroy_cm_id(p->id); 1157 err_id: 1158 p->id = NULL; 1159 ib_destroy_qp(p->qp); 1160 err_qp: 1161 p->qp = NULL; 1162 vfree(p->tx_ring); 1163 err_tx: 1164 return ret; 1165 } 1166 1167 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1168 { 1169 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1170 struct ipoib_tx_buf *tx_req; 1171 unsigned long begin; 1172 1173 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1174 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1175 1176 if (p->id) 1177 ib_destroy_cm_id(p->id); 1178 1179 if (p->tx_ring) { 1180 /* Wait for all sends to complete */ 1181 begin = jiffies; 1182 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1183 if (time_after(jiffies, begin + 5 * HZ)) { 1184 ipoib_warn(priv, "timing out; %d sends not completed\n", 1185 p->tx_head - p->tx_tail); 1186 goto timeout; 1187 } 1188 1189 msleep(1); 1190 } 1191 } 1192 1193 timeout: 1194 1195 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1196 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1197 ipoib_dma_unmap_tx(priv, tx_req); 1198 dev_kfree_skb_any(tx_req->skb); 1199 ++p->tx_tail; 1200 netif_tx_lock_bh(p->dev); 1201 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1202 netif_queue_stopped(p->dev) && 1203 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1204 netif_wake_queue(p->dev); 1205 netif_tx_unlock_bh(p->dev); 1206 } 1207 1208 if (p->qp) 1209 ib_destroy_qp(p->qp); 1210 1211 vfree(p->tx_ring); 1212 kfree(p); 1213 } 1214 1215 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1216 struct ib_cm_event *event) 1217 { 1218 struct ipoib_cm_tx *tx = cm_id->context; 1219 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1220 struct net_device *dev = priv->dev; 1221 struct ipoib_neigh *neigh; 1222 unsigned long flags; 1223 int ret; 1224 1225 switch (event->event) { 1226 case IB_CM_DREQ_RECEIVED: 1227 ipoib_dbg(priv, "DREQ received.\n"); 1228 ib_send_cm_drep(cm_id, NULL, 0); 1229 break; 1230 case IB_CM_REP_RECEIVED: 1231 ipoib_dbg(priv, "REP received.\n"); 1232 ret = ipoib_cm_rep_handler(cm_id, event); 1233 if (ret) 1234 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1235 NULL, 0, NULL, 0); 1236 break; 1237 case IB_CM_REQ_ERROR: 1238 case IB_CM_REJ_RECEIVED: 1239 case IB_CM_TIMEWAIT_EXIT: 1240 ipoib_dbg(priv, "CM error %d.\n", event->event); 1241 netif_tx_lock_bh(dev); 1242 spin_lock_irqsave(&priv->lock, flags); 1243 neigh = tx->neigh; 1244 1245 if (neigh) { 1246 neigh->cm = NULL; 1247 ipoib_neigh_free(neigh); 1248 1249 tx->neigh = NULL; 1250 } 1251 1252 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1253 list_move(&tx->list, &priv->cm.reap_list); 1254 queue_work(priv->wq, &priv->cm.reap_task); 1255 } 1256 1257 spin_unlock_irqrestore(&priv->lock, flags); 1258 netif_tx_unlock_bh(dev); 1259 break; 1260 default: 1261 break; 1262 } 1263 1264 return 0; 1265 } 1266 1267 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1268 struct ipoib_neigh *neigh) 1269 { 1270 struct ipoib_dev_priv *priv = netdev_priv(dev); 1271 struct ipoib_cm_tx *tx; 1272 1273 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1274 if (!tx) 1275 return NULL; 1276 1277 neigh->cm = tx; 1278 tx->neigh = neigh; 1279 tx->path = path; 1280 tx->dev = dev; 1281 list_add(&tx->list, &priv->cm.start_list); 1282 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1283 queue_work(priv->wq, &priv->cm.start_task); 1284 return tx; 1285 } 1286 1287 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1288 { 1289 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1290 unsigned long flags; 1291 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1292 spin_lock_irqsave(&priv->lock, flags); 1293 list_move(&tx->list, &priv->cm.reap_list); 1294 queue_work(priv->wq, &priv->cm.reap_task); 1295 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1296 tx->neigh->daddr + 4); 1297 tx->neigh = NULL; 1298 spin_unlock_irqrestore(&priv->lock, flags); 1299 } 1300 } 1301 1302 static void ipoib_cm_tx_start(struct work_struct *work) 1303 { 1304 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1305 cm.start_task); 1306 struct net_device *dev = priv->dev; 1307 struct ipoib_neigh *neigh; 1308 struct ipoib_cm_tx *p; 1309 unsigned long flags; 1310 int ret; 1311 1312 struct ib_sa_path_rec pathrec; 1313 u32 qpn; 1314 1315 netif_tx_lock_bh(dev); 1316 spin_lock_irqsave(&priv->lock, flags); 1317 1318 while (!list_empty(&priv->cm.start_list)) { 1319 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1320 list_del_init(&p->list); 1321 neigh = p->neigh; 1322 qpn = IPOIB_QPN(neigh->daddr); 1323 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1324 1325 spin_unlock_irqrestore(&priv->lock, flags); 1326 netif_tx_unlock_bh(dev); 1327 1328 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1329 1330 netif_tx_lock_bh(dev); 1331 spin_lock_irqsave(&priv->lock, flags); 1332 1333 if (ret) { 1334 neigh = p->neigh; 1335 if (neigh) { 1336 neigh->cm = NULL; 1337 ipoib_neigh_free(neigh); 1338 } 1339 list_del(&p->list); 1340 kfree(p); 1341 } 1342 } 1343 1344 spin_unlock_irqrestore(&priv->lock, flags); 1345 netif_tx_unlock_bh(dev); 1346 } 1347 1348 static void ipoib_cm_tx_reap(struct work_struct *work) 1349 { 1350 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1351 cm.reap_task); 1352 struct net_device *dev = priv->dev; 1353 struct ipoib_cm_tx *p; 1354 unsigned long flags; 1355 1356 netif_tx_lock_bh(dev); 1357 spin_lock_irqsave(&priv->lock, flags); 1358 1359 while (!list_empty(&priv->cm.reap_list)) { 1360 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1361 list_del(&p->list); 1362 spin_unlock_irqrestore(&priv->lock, flags); 1363 netif_tx_unlock_bh(dev); 1364 ipoib_cm_tx_destroy(p); 1365 netif_tx_lock_bh(dev); 1366 spin_lock_irqsave(&priv->lock, flags); 1367 } 1368 1369 spin_unlock_irqrestore(&priv->lock, flags); 1370 netif_tx_unlock_bh(dev); 1371 } 1372 1373 static void ipoib_cm_skb_reap(struct work_struct *work) 1374 { 1375 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1376 cm.skb_task); 1377 struct net_device *dev = priv->dev; 1378 struct sk_buff *skb; 1379 unsigned long flags; 1380 unsigned mtu = priv->mcast_mtu; 1381 1382 netif_tx_lock_bh(dev); 1383 spin_lock_irqsave(&priv->lock, flags); 1384 1385 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1386 spin_unlock_irqrestore(&priv->lock, flags); 1387 netif_tx_unlock_bh(dev); 1388 1389 if (skb->protocol == htons(ETH_P_IP)) 1390 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1391 #if IS_ENABLED(CONFIG_IPV6) 1392 else if (skb->protocol == htons(ETH_P_IPV6)) 1393 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1394 #endif 1395 dev_kfree_skb_any(skb); 1396 1397 netif_tx_lock_bh(dev); 1398 spin_lock_irqsave(&priv->lock, flags); 1399 } 1400 1401 spin_unlock_irqrestore(&priv->lock, flags); 1402 netif_tx_unlock_bh(dev); 1403 } 1404 1405 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1406 unsigned int mtu) 1407 { 1408 struct ipoib_dev_priv *priv = netdev_priv(dev); 1409 int e = skb_queue_empty(&priv->cm.skb_queue); 1410 1411 if (skb_dst(skb)) 1412 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1413 1414 skb_queue_tail(&priv->cm.skb_queue, skb); 1415 if (e) 1416 queue_work(priv->wq, &priv->cm.skb_task); 1417 } 1418 1419 static void ipoib_cm_rx_reap(struct work_struct *work) 1420 { 1421 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1422 cm.rx_reap_task)->dev); 1423 } 1424 1425 static void ipoib_cm_stale_task(struct work_struct *work) 1426 { 1427 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1428 cm.stale_task.work); 1429 struct ipoib_cm_rx *p; 1430 int ret; 1431 1432 spin_lock_irq(&priv->lock); 1433 while (!list_empty(&priv->cm.passive_ids)) { 1434 /* List is sorted by LRU, start from tail, 1435 * stop when we see a recently used entry */ 1436 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1437 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1438 break; 1439 list_move(&p->list, &priv->cm.rx_error_list); 1440 p->state = IPOIB_CM_RX_ERROR; 1441 spin_unlock_irq(&priv->lock); 1442 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1443 if (ret) 1444 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1445 spin_lock_irq(&priv->lock); 1446 } 1447 1448 if (!list_empty(&priv->cm.passive_ids)) 1449 queue_delayed_work(priv->wq, 1450 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1451 spin_unlock_irq(&priv->lock); 1452 } 1453 1454 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1455 char *buf) 1456 { 1457 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1458 1459 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1460 return sprintf(buf, "connected\n"); 1461 else 1462 return sprintf(buf, "datagram\n"); 1463 } 1464 1465 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1466 const char *buf, size_t count) 1467 { 1468 struct net_device *dev = to_net_dev(d); 1469 int ret; 1470 1471 if (!rtnl_trylock()) 1472 return restart_syscall(); 1473 1474 ret = ipoib_set_mode(dev, buf); 1475 1476 rtnl_unlock(); 1477 1478 if (!ret) 1479 return count; 1480 1481 return ret; 1482 } 1483 1484 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1485 1486 int ipoib_cm_add_mode_attr(struct net_device *dev) 1487 { 1488 return device_create_file(&dev->dev, &dev_attr_mode); 1489 } 1490 1491 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1492 { 1493 struct ipoib_dev_priv *priv = netdev_priv(dev); 1494 struct ib_srq_init_attr srq_init_attr = { 1495 .srq_type = IB_SRQT_BASIC, 1496 .attr = { 1497 .max_wr = ipoib_recvq_size, 1498 .max_sge = max_sge 1499 } 1500 }; 1501 1502 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1503 if (IS_ERR(priv->cm.srq)) { 1504 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1505 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1506 priv->ca->name, PTR_ERR(priv->cm.srq)); 1507 priv->cm.srq = NULL; 1508 return; 1509 } 1510 1511 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1512 if (!priv->cm.srq_ring) { 1513 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1514 priv->ca->name, ipoib_recvq_size); 1515 ib_destroy_srq(priv->cm.srq); 1516 priv->cm.srq = NULL; 1517 return; 1518 } 1519 1520 } 1521 1522 int ipoib_cm_dev_init(struct net_device *dev) 1523 { 1524 struct ipoib_dev_priv *priv = netdev_priv(dev); 1525 int i, ret; 1526 struct ib_device_attr attr; 1527 1528 INIT_LIST_HEAD(&priv->cm.passive_ids); 1529 INIT_LIST_HEAD(&priv->cm.reap_list); 1530 INIT_LIST_HEAD(&priv->cm.start_list); 1531 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1532 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1533 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1534 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1535 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1536 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1537 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1538 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1539 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1540 1541 skb_queue_head_init(&priv->cm.skb_queue); 1542 1543 ret = ib_query_device(priv->ca, &attr); 1544 if (ret) { 1545 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1546 return ret; 1547 } 1548 1549 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1550 1551 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1552 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1553 if (ipoib_cm_has_srq(dev)) { 1554 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1555 priv->cm.num_frags = attr.max_srq_sge; 1556 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1557 priv->cm.max_cm_mtu, priv->cm.num_frags); 1558 } else { 1559 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1560 priv->cm.num_frags = IPOIB_CM_RX_SG; 1561 } 1562 1563 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1564 1565 if (ipoib_cm_has_srq(dev)) { 1566 for (i = 0; i < ipoib_recvq_size; ++i) { 1567 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1568 priv->cm.num_frags - 1, 1569 priv->cm.srq_ring[i].mapping, 1570 GFP_KERNEL)) { 1571 ipoib_warn(priv, "failed to allocate " 1572 "receive buffer %d\n", i); 1573 ipoib_cm_dev_cleanup(dev); 1574 return -ENOMEM; 1575 } 1576 1577 if (ipoib_cm_post_receive_srq(dev, i)) { 1578 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1579 "failed for buf %d\n", i); 1580 ipoib_cm_dev_cleanup(dev); 1581 return -EIO; 1582 } 1583 } 1584 } 1585 1586 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1587 return 0; 1588 } 1589 1590 void ipoib_cm_dev_cleanup(struct net_device *dev) 1591 { 1592 struct ipoib_dev_priv *priv = netdev_priv(dev); 1593 int ret; 1594 1595 if (!priv->cm.srq) 1596 return; 1597 1598 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1599 1600 ret = ib_destroy_srq(priv->cm.srq); 1601 if (ret) 1602 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1603 1604 priv->cm.srq = NULL; 1605 if (!priv->cm.srq_ring) 1606 return; 1607 1608 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1609 priv->cm.srq_ring = NULL; 1610 } 1611