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 #define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN) 67 68 static struct ib_qp_attr ipoib_cm_err_attr = { 69 .qp_state = IB_QPS_ERR 70 }; 71 72 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 73 74 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 75 .opcode = IB_WR_SEND, 76 }; 77 78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 79 struct ib_cm_event *event); 80 81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 82 u64 mapping[IPOIB_CM_RX_SG]) 83 { 84 int i; 85 86 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 87 88 for (i = 0; i < frags; ++i) 89 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 90 } 91 92 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 93 { 94 struct ipoib_dev_priv *priv = netdev_priv(dev); 95 struct ib_recv_wr *bad_wr; 96 int i, ret; 97 98 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 99 100 for (i = 0; i < priv->cm.num_frags; ++i) 101 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 102 103 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 104 if (unlikely(ret)) { 105 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 106 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 107 priv->cm.srq_ring[id].mapping); 108 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 109 priv->cm.srq_ring[id].skb = NULL; 110 } 111 112 return ret; 113 } 114 115 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 116 struct ipoib_cm_rx *rx, 117 struct ib_recv_wr *wr, 118 struct ib_sge *sge, int id) 119 { 120 struct ipoib_dev_priv *priv = netdev_priv(dev); 121 struct ib_recv_wr *bad_wr; 122 int i, ret; 123 124 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 125 126 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 127 sge[i].addr = rx->rx_ring[id].mapping[i]; 128 129 ret = ib_post_recv(rx->qp, wr, &bad_wr); 130 if (unlikely(ret)) { 131 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 132 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 133 rx->rx_ring[id].mapping); 134 dev_kfree_skb_any(rx->rx_ring[id].skb); 135 rx->rx_ring[id].skb = NULL; 136 } 137 138 return ret; 139 } 140 141 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 142 struct ipoib_cm_rx_buf *rx_ring, 143 int id, int frags, 144 u64 mapping[IPOIB_CM_RX_SG], 145 gfp_t gfp) 146 { 147 struct ipoib_dev_priv *priv = netdev_priv(dev); 148 struct sk_buff *skb; 149 int i; 150 151 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16)); 152 if (unlikely(!skb)) 153 return NULL; 154 155 /* 156 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the 157 * IP header to a multiple of 16. 158 */ 159 skb_reserve(skb, IPOIB_CM_RX_RESERVE); 160 161 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 162 DMA_FROM_DEVICE); 163 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 164 dev_kfree_skb_any(skb); 165 return NULL; 166 } 167 168 for (i = 0; i < frags; i++) { 169 struct page *page = alloc_page(gfp); 170 171 if (!page) 172 goto partial_error; 173 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 174 175 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 176 0, PAGE_SIZE, DMA_FROM_DEVICE); 177 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 178 goto partial_error; 179 } 180 181 rx_ring[id].skb = skb; 182 return skb; 183 184 partial_error: 185 186 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 187 188 for (; i > 0; --i) 189 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 190 191 dev_kfree_skb_any(skb); 192 return NULL; 193 } 194 195 static void ipoib_cm_free_rx_ring(struct net_device *dev, 196 struct ipoib_cm_rx_buf *rx_ring) 197 { 198 struct ipoib_dev_priv *priv = netdev_priv(dev); 199 int i; 200 201 for (i = 0; i < ipoib_recvq_size; ++i) 202 if (rx_ring[i].skb) { 203 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 204 rx_ring[i].mapping); 205 dev_kfree_skb_any(rx_ring[i].skb); 206 } 207 208 vfree(rx_ring); 209 } 210 211 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 212 { 213 struct ib_send_wr *bad_wr; 214 struct ipoib_cm_rx *p; 215 216 /* We only reserved 1 extra slot in CQ for drain WRs, so 217 * make sure we have at most 1 outstanding WR. */ 218 if (list_empty(&priv->cm.rx_flush_list) || 219 !list_empty(&priv->cm.rx_drain_list)) 220 return; 221 222 /* 223 * QPs on flush list are error state. This way, a "flush 224 * error" WC will be immediately generated for each WR we post. 225 */ 226 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 227 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID; 228 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 229 ipoib_warn(priv, "failed to post drain wr\n"); 230 231 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 232 } 233 234 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 235 { 236 struct ipoib_cm_rx *p = ctx; 237 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 238 unsigned long flags; 239 240 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 241 return; 242 243 spin_lock_irqsave(&priv->lock, flags); 244 list_move(&p->list, &priv->cm.rx_flush_list); 245 p->state = IPOIB_CM_RX_FLUSH; 246 ipoib_cm_start_rx_drain(priv); 247 spin_unlock_irqrestore(&priv->lock, flags); 248 } 249 250 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 251 struct ipoib_cm_rx *p) 252 { 253 struct ipoib_dev_priv *priv = netdev_priv(dev); 254 struct ib_qp_init_attr attr = { 255 .event_handler = ipoib_cm_rx_event_handler, 256 .send_cq = priv->recv_cq, /* For drain WR */ 257 .recv_cq = priv->recv_cq, 258 .srq = priv->cm.srq, 259 .cap.max_send_wr = 1, /* For drain WR */ 260 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 261 .sq_sig_type = IB_SIGNAL_ALL_WR, 262 .qp_type = IB_QPT_RC, 263 .qp_context = p, 264 }; 265 266 if (!ipoib_cm_has_srq(dev)) { 267 attr.cap.max_recv_wr = ipoib_recvq_size; 268 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 269 } 270 271 return ib_create_qp(priv->pd, &attr); 272 } 273 274 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 275 struct ib_cm_id *cm_id, struct ib_qp *qp, 276 unsigned psn) 277 { 278 struct ipoib_dev_priv *priv = netdev_priv(dev); 279 struct ib_qp_attr qp_attr; 280 int qp_attr_mask, ret; 281 282 qp_attr.qp_state = IB_QPS_INIT; 283 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 284 if (ret) { 285 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 286 return ret; 287 } 288 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 289 if (ret) { 290 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 291 return ret; 292 } 293 qp_attr.qp_state = IB_QPS_RTR; 294 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 295 if (ret) { 296 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 297 return ret; 298 } 299 qp_attr.rq_psn = psn; 300 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 301 if (ret) { 302 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 303 return ret; 304 } 305 306 /* 307 * Current Mellanox HCA firmware won't generate completions 308 * with error for drain WRs unless the QP has been moved to 309 * RTS first. This work-around leaves a window where a QP has 310 * moved to error asynchronously, but this will eventually get 311 * fixed in firmware, so let's not error out if modify QP 312 * fails. 313 */ 314 qp_attr.qp_state = IB_QPS_RTS; 315 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 316 if (ret) { 317 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 318 return 0; 319 } 320 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 321 if (ret) { 322 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 323 return 0; 324 } 325 326 return 0; 327 } 328 329 static void ipoib_cm_init_rx_wr(struct net_device *dev, 330 struct ib_recv_wr *wr, 331 struct ib_sge *sge) 332 { 333 struct ipoib_dev_priv *priv = netdev_priv(dev); 334 int i; 335 336 for (i = 0; i < priv->cm.num_frags; ++i) 337 sge[i].lkey = priv->pd->local_dma_lkey; 338 339 sge[0].length = IPOIB_CM_HEAD_SIZE; 340 for (i = 1; i < priv->cm.num_frags; ++i) 341 sge[i].length = PAGE_SIZE; 342 343 wr->next = NULL; 344 wr->sg_list = sge; 345 wr->num_sge = priv->cm.num_frags; 346 } 347 348 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 349 struct ipoib_cm_rx *rx) 350 { 351 struct ipoib_dev_priv *priv = netdev_priv(dev); 352 struct { 353 struct ib_recv_wr wr; 354 struct ib_sge sge[IPOIB_CM_RX_SG]; 355 } *t; 356 int ret; 357 int i; 358 359 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 360 if (!rx->rx_ring) { 361 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 362 priv->ca->name, ipoib_recvq_size); 363 return -ENOMEM; 364 } 365 366 t = kmalloc(sizeof *t, GFP_KERNEL); 367 if (!t) { 368 ret = -ENOMEM; 369 goto err_free; 370 } 371 372 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 373 374 spin_lock_irq(&priv->lock); 375 376 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 377 spin_unlock_irq(&priv->lock); 378 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 379 ret = -EINVAL; 380 goto err_free; 381 } else 382 ++priv->cm.nonsrq_conn_qp; 383 384 spin_unlock_irq(&priv->lock); 385 386 for (i = 0; i < ipoib_recvq_size; ++i) { 387 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 388 rx->rx_ring[i].mapping, 389 GFP_KERNEL)) { 390 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 391 ret = -ENOMEM; 392 goto err_count; 393 } 394 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 395 if (ret) { 396 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 397 "failed for buf %d\n", i); 398 ret = -EIO; 399 goto err_count; 400 } 401 } 402 403 rx->recv_count = ipoib_recvq_size; 404 405 kfree(t); 406 407 return 0; 408 409 err_count: 410 spin_lock_irq(&priv->lock); 411 --priv->cm.nonsrq_conn_qp; 412 spin_unlock_irq(&priv->lock); 413 414 err_free: 415 kfree(t); 416 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 417 418 return ret; 419 } 420 421 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 422 struct ib_qp *qp, struct ib_cm_req_event_param *req, 423 unsigned psn) 424 { 425 struct ipoib_dev_priv *priv = netdev_priv(dev); 426 struct ipoib_cm_data data = {}; 427 struct ib_cm_rep_param rep = {}; 428 429 data.qpn = cpu_to_be32(priv->qp->qp_num); 430 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 431 432 rep.private_data = &data; 433 rep.private_data_len = sizeof data; 434 rep.flow_control = 0; 435 rep.rnr_retry_count = req->rnr_retry_count; 436 rep.srq = ipoib_cm_has_srq(dev); 437 rep.qp_num = qp->qp_num; 438 rep.starting_psn = psn; 439 return ib_send_cm_rep(cm_id, &rep); 440 } 441 442 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 443 { 444 struct net_device *dev = cm_id->context; 445 struct ipoib_dev_priv *priv = netdev_priv(dev); 446 struct ipoib_cm_rx *p; 447 unsigned psn; 448 int ret; 449 450 ipoib_dbg(priv, "REQ arrived\n"); 451 p = kzalloc(sizeof *p, GFP_KERNEL); 452 if (!p) 453 return -ENOMEM; 454 p->dev = dev; 455 p->id = cm_id; 456 cm_id->context = p; 457 p->state = IPOIB_CM_RX_LIVE; 458 p->jiffies = jiffies; 459 INIT_LIST_HEAD(&p->list); 460 461 p->qp = ipoib_cm_create_rx_qp(dev, p); 462 if (IS_ERR(p->qp)) { 463 ret = PTR_ERR(p->qp); 464 goto err_qp; 465 } 466 467 psn = prandom_u32() & 0xffffff; 468 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 469 if (ret) 470 goto err_modify; 471 472 if (!ipoib_cm_has_srq(dev)) { 473 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 474 if (ret) 475 goto err_modify; 476 } 477 478 spin_lock_irq(&priv->lock); 479 queue_delayed_work(priv->wq, 480 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 481 /* Add this entry to passive ids list head, but do not re-add it 482 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 483 p->jiffies = jiffies; 484 if (p->state == IPOIB_CM_RX_LIVE) 485 list_move(&p->list, &priv->cm.passive_ids); 486 spin_unlock_irq(&priv->lock); 487 488 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 489 if (ret) { 490 ipoib_warn(priv, "failed to send REP: %d\n", ret); 491 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 492 ipoib_warn(priv, "unable to move qp to error state\n"); 493 } 494 return 0; 495 496 err_modify: 497 ib_destroy_qp(p->qp); 498 err_qp: 499 kfree(p); 500 return ret; 501 } 502 503 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 504 struct ib_cm_event *event) 505 { 506 struct ipoib_cm_rx *p; 507 struct ipoib_dev_priv *priv; 508 509 switch (event->event) { 510 case IB_CM_REQ_RECEIVED: 511 return ipoib_cm_req_handler(cm_id, event); 512 case IB_CM_DREQ_RECEIVED: 513 p = cm_id->context; 514 ib_send_cm_drep(cm_id, NULL, 0); 515 /* Fall through */ 516 case IB_CM_REJ_RECEIVED: 517 p = cm_id->context; 518 priv = netdev_priv(p->dev); 519 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 520 ipoib_warn(priv, "unable to move qp to error state\n"); 521 /* Fall through */ 522 default: 523 return 0; 524 } 525 } 526 /* Adjust length of skb with fragments to match received data */ 527 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 528 unsigned int length, struct sk_buff *toskb) 529 { 530 int i, num_frags; 531 unsigned int size; 532 533 /* put header into skb */ 534 size = min(length, hdr_space); 535 skb->tail += size; 536 skb->len += size; 537 length -= size; 538 539 num_frags = skb_shinfo(skb)->nr_frags; 540 for (i = 0; i < num_frags; i++) { 541 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 542 543 if (length == 0) { 544 /* don't need this page */ 545 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 546 0, PAGE_SIZE); 547 --skb_shinfo(skb)->nr_frags; 548 } else { 549 size = min(length, (unsigned) PAGE_SIZE); 550 551 skb_frag_size_set(frag, size); 552 skb->data_len += size; 553 skb->truesize += size; 554 skb->len += size; 555 length -= size; 556 } 557 } 558 } 559 560 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 561 { 562 struct ipoib_dev_priv *priv = netdev_priv(dev); 563 struct ipoib_cm_rx_buf *rx_ring; 564 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 565 struct sk_buff *skb, *newskb; 566 struct ipoib_cm_rx *p; 567 unsigned long flags; 568 u64 mapping[IPOIB_CM_RX_SG]; 569 int frags; 570 int has_srq; 571 struct sk_buff *small_skb; 572 573 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 574 wr_id, wc->status); 575 576 if (unlikely(wr_id >= ipoib_recvq_size)) { 577 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 578 spin_lock_irqsave(&priv->lock, flags); 579 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 580 ipoib_cm_start_rx_drain(priv); 581 queue_work(priv->wq, &priv->cm.rx_reap_task); 582 spin_unlock_irqrestore(&priv->lock, flags); 583 } else 584 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 585 wr_id, ipoib_recvq_size); 586 return; 587 } 588 589 p = wc->qp->qp_context; 590 591 has_srq = ipoib_cm_has_srq(dev); 592 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 593 594 skb = rx_ring[wr_id].skb; 595 596 if (unlikely(wc->status != IB_WC_SUCCESS)) { 597 ipoib_dbg(priv, "cm recv error " 598 "(status=%d, wrid=%d vend_err %x)\n", 599 wc->status, wr_id, wc->vendor_err); 600 ++dev->stats.rx_dropped; 601 if (has_srq) 602 goto repost; 603 else { 604 if (!--p->recv_count) { 605 spin_lock_irqsave(&priv->lock, flags); 606 list_move(&p->list, &priv->cm.rx_reap_list); 607 spin_unlock_irqrestore(&priv->lock, flags); 608 queue_work(priv->wq, &priv->cm.rx_reap_task); 609 } 610 return; 611 } 612 } 613 614 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 615 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 616 spin_lock_irqsave(&priv->lock, flags); 617 p->jiffies = jiffies; 618 /* Move this entry to list head, but do not re-add it 619 * if it has been moved out of list. */ 620 if (p->state == IPOIB_CM_RX_LIVE) 621 list_move(&p->list, &priv->cm.passive_ids); 622 spin_unlock_irqrestore(&priv->lock, flags); 623 } 624 } 625 626 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 627 int dlen = wc->byte_len; 628 629 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE); 630 if (small_skb) { 631 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE); 632 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 633 dlen, DMA_FROM_DEVICE); 634 skb_copy_from_linear_data(skb, small_skb->data, dlen); 635 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 636 dlen, DMA_FROM_DEVICE); 637 skb_put(small_skb, dlen); 638 skb = small_skb; 639 goto copied; 640 } 641 } 642 643 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 644 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 645 646 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, 647 mapping, GFP_ATOMIC); 648 if (unlikely(!newskb)) { 649 /* 650 * If we can't allocate a new RX buffer, dump 651 * this packet and reuse the old buffer. 652 */ 653 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 654 ++dev->stats.rx_dropped; 655 goto repost; 656 } 657 658 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 659 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 660 661 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 662 wc->byte_len, wc->slid); 663 664 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 665 666 copied: 667 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 668 skb_add_pseudo_hdr(skb); 669 670 ++dev->stats.rx_packets; 671 dev->stats.rx_bytes += skb->len; 672 673 skb->dev = dev; 674 /* XXX get correct PACKET_ type here */ 675 skb->pkt_type = PACKET_HOST; 676 netif_receive_skb(skb); 677 678 repost: 679 if (has_srq) { 680 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 681 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 682 "for buf %d\n", wr_id); 683 } else { 684 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 685 &priv->cm.rx_wr, 686 priv->cm.rx_sge, 687 wr_id))) { 688 --p->recv_count; 689 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 690 "for buf %d\n", wr_id); 691 } 692 } 693 } 694 695 static inline int post_send(struct ipoib_dev_priv *priv, 696 struct ipoib_cm_tx *tx, 697 unsigned int wr_id, 698 struct ipoib_tx_buf *tx_req) 699 { 700 struct ib_send_wr *bad_wr; 701 702 ipoib_build_sge(priv, tx_req); 703 704 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 705 706 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); 707 } 708 709 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 710 { 711 struct ipoib_dev_priv *priv = netdev_priv(dev); 712 struct ipoib_tx_buf *tx_req; 713 int rc; 714 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb); 715 716 if (unlikely(skb->len > tx->mtu)) { 717 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 718 skb->len, tx->mtu); 719 ++dev->stats.tx_dropped; 720 ++dev->stats.tx_errors; 721 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 722 return; 723 } 724 if (skb_shinfo(skb)->nr_frags > usable_sge) { 725 if (skb_linearize(skb) < 0) { 726 ipoib_warn(priv, "skb could not be linearized\n"); 727 ++dev->stats.tx_dropped; 728 ++dev->stats.tx_errors; 729 dev_kfree_skb_any(skb); 730 return; 731 } 732 /* Does skb_linearize return ok without reducing nr_frags? */ 733 if (skb_shinfo(skb)->nr_frags > usable_sge) { 734 ipoib_warn(priv, "too many frags after skb linearize\n"); 735 ++dev->stats.tx_dropped; 736 ++dev->stats.tx_errors; 737 dev_kfree_skb_any(skb); 738 return; 739 } 740 } 741 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 742 tx->tx_head, skb->len, tx->qp->qp_num); 743 744 /* 745 * We put the skb into the tx_ring _before_ we call post_send() 746 * because it's entirely possible that the completion handler will 747 * run before we execute anything after the post_send(). That 748 * means we have to make sure everything is properly recorded and 749 * our state is consistent before we call post_send(). 750 */ 751 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 752 tx_req->skb = skb; 753 754 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 755 ++dev->stats.tx_errors; 756 dev_kfree_skb_any(skb); 757 return; 758 } 759 760 skb_orphan(skb); 761 skb_dst_drop(skb); 762 763 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req); 764 if (unlikely(rc)) { 765 ipoib_warn(priv, "post_send failed, error %d\n", rc); 766 ++dev->stats.tx_errors; 767 ipoib_dma_unmap_tx(priv, tx_req); 768 dev_kfree_skb_any(skb); 769 } else { 770 netif_trans_update(dev); 771 ++tx->tx_head; 772 773 if (++priv->tx_outstanding == ipoib_sendq_size) { 774 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 775 tx->qp->qp_num); 776 netif_stop_queue(dev); 777 rc = ib_req_notify_cq(priv->send_cq, 778 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 779 if (rc < 0) 780 ipoib_warn(priv, "request notify on send CQ failed\n"); 781 else if (rc) 782 ipoib_send_comp_handler(priv->send_cq, dev); 783 } 784 } 785 } 786 787 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 788 { 789 struct ipoib_dev_priv *priv = netdev_priv(dev); 790 struct ipoib_cm_tx *tx = wc->qp->qp_context; 791 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 792 struct ipoib_tx_buf *tx_req; 793 unsigned long flags; 794 795 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 796 wr_id, wc->status); 797 798 if (unlikely(wr_id >= ipoib_sendq_size)) { 799 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 800 wr_id, ipoib_sendq_size); 801 return; 802 } 803 804 tx_req = &tx->tx_ring[wr_id]; 805 806 ipoib_dma_unmap_tx(priv, tx_req); 807 808 /* FIXME: is this right? Shouldn't we only increment on success? */ 809 ++dev->stats.tx_packets; 810 dev->stats.tx_bytes += tx_req->skb->len; 811 812 dev_kfree_skb_any(tx_req->skb); 813 814 netif_tx_lock(dev); 815 816 ++tx->tx_tail; 817 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 818 netif_queue_stopped(dev) && 819 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 820 netif_wake_queue(dev); 821 822 if (wc->status != IB_WC_SUCCESS && 823 wc->status != IB_WC_WR_FLUSH_ERR) { 824 struct ipoib_neigh *neigh; 825 826 ipoib_dbg(priv, "failed cm send event " 827 "(status=%d, wrid=%d vend_err %x)\n", 828 wc->status, wr_id, wc->vendor_err); 829 830 spin_lock_irqsave(&priv->lock, flags); 831 neigh = tx->neigh; 832 833 if (neigh) { 834 neigh->cm = NULL; 835 ipoib_neigh_free(neigh); 836 837 tx->neigh = NULL; 838 } 839 840 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 841 list_move(&tx->list, &priv->cm.reap_list); 842 queue_work(priv->wq, &priv->cm.reap_task); 843 } 844 845 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 846 847 spin_unlock_irqrestore(&priv->lock, flags); 848 } 849 850 netif_tx_unlock(dev); 851 } 852 853 int ipoib_cm_dev_open(struct net_device *dev) 854 { 855 struct ipoib_dev_priv *priv = netdev_priv(dev); 856 int ret; 857 858 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 859 return 0; 860 861 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 862 if (IS_ERR(priv->cm.id)) { 863 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 864 ret = PTR_ERR(priv->cm.id); 865 goto err_cm; 866 } 867 868 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 869 0); 870 if (ret) { 871 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 872 IPOIB_CM_IETF_ID | priv->qp->qp_num); 873 goto err_listen; 874 } 875 876 return 0; 877 878 err_listen: 879 ib_destroy_cm_id(priv->cm.id); 880 err_cm: 881 priv->cm.id = NULL; 882 return ret; 883 } 884 885 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 886 { 887 struct ipoib_dev_priv *priv = netdev_priv(dev); 888 struct ipoib_cm_rx *rx, *n; 889 LIST_HEAD(list); 890 891 spin_lock_irq(&priv->lock); 892 list_splice_init(&priv->cm.rx_reap_list, &list); 893 spin_unlock_irq(&priv->lock); 894 895 list_for_each_entry_safe(rx, n, &list, list) { 896 ib_destroy_cm_id(rx->id); 897 ib_destroy_qp(rx->qp); 898 if (!ipoib_cm_has_srq(dev)) { 899 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 900 spin_lock_irq(&priv->lock); 901 --priv->cm.nonsrq_conn_qp; 902 spin_unlock_irq(&priv->lock); 903 } 904 kfree(rx); 905 } 906 } 907 908 void ipoib_cm_dev_stop(struct net_device *dev) 909 { 910 struct ipoib_dev_priv *priv = netdev_priv(dev); 911 struct ipoib_cm_rx *p; 912 unsigned long begin; 913 int ret; 914 915 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 916 return; 917 918 ib_destroy_cm_id(priv->cm.id); 919 priv->cm.id = NULL; 920 921 spin_lock_irq(&priv->lock); 922 while (!list_empty(&priv->cm.passive_ids)) { 923 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 924 list_move(&p->list, &priv->cm.rx_error_list); 925 p->state = IPOIB_CM_RX_ERROR; 926 spin_unlock_irq(&priv->lock); 927 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 928 if (ret) 929 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 930 spin_lock_irq(&priv->lock); 931 } 932 933 /* Wait for all RX to be drained */ 934 begin = jiffies; 935 936 while (!list_empty(&priv->cm.rx_error_list) || 937 !list_empty(&priv->cm.rx_flush_list) || 938 !list_empty(&priv->cm.rx_drain_list)) { 939 if (time_after(jiffies, begin + 5 * HZ)) { 940 ipoib_warn(priv, "RX drain timing out\n"); 941 942 /* 943 * assume the HW is wedged and just free up everything. 944 */ 945 list_splice_init(&priv->cm.rx_flush_list, 946 &priv->cm.rx_reap_list); 947 list_splice_init(&priv->cm.rx_error_list, 948 &priv->cm.rx_reap_list); 949 list_splice_init(&priv->cm.rx_drain_list, 950 &priv->cm.rx_reap_list); 951 break; 952 } 953 spin_unlock_irq(&priv->lock); 954 msleep(1); 955 ipoib_drain_cq(dev); 956 spin_lock_irq(&priv->lock); 957 } 958 959 spin_unlock_irq(&priv->lock); 960 961 ipoib_cm_free_rx_reap_list(dev); 962 963 cancel_delayed_work(&priv->cm.stale_task); 964 } 965 966 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 967 { 968 struct ipoib_cm_tx *p = cm_id->context; 969 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 970 struct ipoib_cm_data *data = event->private_data; 971 struct sk_buff_head skqueue; 972 struct ib_qp_attr qp_attr; 973 int qp_attr_mask, ret; 974 struct sk_buff *skb; 975 976 p->mtu = be32_to_cpu(data->mtu); 977 978 if (p->mtu <= IPOIB_ENCAP_LEN) { 979 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 980 p->mtu, IPOIB_ENCAP_LEN); 981 return -EINVAL; 982 } 983 984 qp_attr.qp_state = IB_QPS_RTR; 985 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 986 if (ret) { 987 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 988 return ret; 989 } 990 991 qp_attr.rq_psn = 0 /* FIXME */; 992 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 993 if (ret) { 994 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 995 return ret; 996 } 997 998 qp_attr.qp_state = IB_QPS_RTS; 999 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 1000 if (ret) { 1001 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 1002 return ret; 1003 } 1004 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 1005 if (ret) { 1006 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 1007 return ret; 1008 } 1009 1010 skb_queue_head_init(&skqueue); 1011 1012 spin_lock_irq(&priv->lock); 1013 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 1014 if (p->neigh) 1015 while ((skb = __skb_dequeue(&p->neigh->queue))) 1016 __skb_queue_tail(&skqueue, skb); 1017 spin_unlock_irq(&priv->lock); 1018 1019 while ((skb = __skb_dequeue(&skqueue))) { 1020 skb->dev = p->dev; 1021 if (dev_queue_xmit(skb)) 1022 ipoib_warn(priv, "dev_queue_xmit failed " 1023 "to requeue packet\n"); 1024 } 1025 1026 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1027 if (ret) { 1028 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1029 return ret; 1030 } 1031 return 0; 1032 } 1033 1034 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1035 { 1036 struct ipoib_dev_priv *priv = netdev_priv(dev); 1037 struct ib_qp_init_attr attr = { 1038 .send_cq = priv->recv_cq, 1039 .recv_cq = priv->recv_cq, 1040 .srq = priv->cm.srq, 1041 .cap.max_send_wr = ipoib_sendq_size, 1042 .cap.max_send_sge = 1, 1043 .sq_sig_type = IB_SIGNAL_ALL_WR, 1044 .qp_type = IB_QPT_RC, 1045 .qp_context = tx, 1046 .create_flags = IB_QP_CREATE_USE_GFP_NOIO 1047 }; 1048 1049 struct ib_qp *tx_qp; 1050 1051 if (dev->features & NETIF_F_SG) 1052 attr.cap.max_send_sge = 1053 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1); 1054 1055 tx_qp = ib_create_qp(priv->pd, &attr); 1056 if (PTR_ERR(tx_qp) == -EINVAL) { 1057 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n", 1058 priv->ca->name); 1059 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO; 1060 tx_qp = ib_create_qp(priv->pd, &attr); 1061 } 1062 tx->max_send_sge = attr.cap.max_send_sge; 1063 return tx_qp; 1064 } 1065 1066 static int ipoib_cm_send_req(struct net_device *dev, 1067 struct ib_cm_id *id, struct ib_qp *qp, 1068 u32 qpn, 1069 struct ib_sa_path_rec *pathrec) 1070 { 1071 struct ipoib_dev_priv *priv = netdev_priv(dev); 1072 struct ipoib_cm_data data = {}; 1073 struct ib_cm_req_param req = {}; 1074 1075 data.qpn = cpu_to_be32(priv->qp->qp_num); 1076 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1077 1078 req.primary_path = pathrec; 1079 req.alternate_path = NULL; 1080 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1081 req.qp_num = qp->qp_num; 1082 req.qp_type = qp->qp_type; 1083 req.private_data = &data; 1084 req.private_data_len = sizeof data; 1085 req.flow_control = 0; 1086 1087 req.starting_psn = 0; /* FIXME */ 1088 1089 /* 1090 * Pick some arbitrary defaults here; we could make these 1091 * module parameters if anyone cared about setting them. 1092 */ 1093 req.responder_resources = 4; 1094 req.remote_cm_response_timeout = 20; 1095 req.local_cm_response_timeout = 20; 1096 req.retry_count = 0; /* RFC draft warns against retries */ 1097 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1098 req.max_cm_retries = 15; 1099 req.srq = ipoib_cm_has_srq(dev); 1100 return ib_send_cm_req(id, &req); 1101 } 1102 1103 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1104 struct ib_cm_id *cm_id, struct ib_qp *qp) 1105 { 1106 struct ipoib_dev_priv *priv = netdev_priv(dev); 1107 struct ib_qp_attr qp_attr; 1108 int qp_attr_mask, ret; 1109 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1110 if (ret) { 1111 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1112 return ret; 1113 } 1114 1115 qp_attr.qp_state = IB_QPS_INIT; 1116 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1117 qp_attr.port_num = priv->port; 1118 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1119 1120 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1121 if (ret) { 1122 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1123 return ret; 1124 } 1125 return 0; 1126 } 1127 1128 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1129 struct ib_sa_path_rec *pathrec) 1130 { 1131 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1132 int ret; 1133 1134 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring, 1135 GFP_NOIO, PAGE_KERNEL); 1136 if (!p->tx_ring) { 1137 ipoib_warn(priv, "failed to allocate tx ring\n"); 1138 ret = -ENOMEM; 1139 goto err_tx; 1140 } 1141 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1142 1143 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1144 if (IS_ERR(p->qp)) { 1145 ret = PTR_ERR(p->qp); 1146 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1147 goto err_qp; 1148 } 1149 1150 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1151 if (IS_ERR(p->id)) { 1152 ret = PTR_ERR(p->id); 1153 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1154 goto err_id; 1155 } 1156 1157 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1158 if (ret) { 1159 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1160 goto err_modify; 1161 } 1162 1163 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1164 if (ret) { 1165 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1166 goto err_send_cm; 1167 } 1168 1169 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1170 p->qp->qp_num, pathrec->dgid.raw, qpn); 1171 1172 return 0; 1173 1174 err_send_cm: 1175 err_modify: 1176 ib_destroy_cm_id(p->id); 1177 err_id: 1178 p->id = NULL; 1179 ib_destroy_qp(p->qp); 1180 err_qp: 1181 p->qp = NULL; 1182 vfree(p->tx_ring); 1183 err_tx: 1184 return ret; 1185 } 1186 1187 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1188 { 1189 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1190 struct ipoib_tx_buf *tx_req; 1191 unsigned long begin; 1192 1193 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1194 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1195 1196 if (p->id) 1197 ib_destroy_cm_id(p->id); 1198 1199 if (p->tx_ring) { 1200 /* Wait for all sends to complete */ 1201 begin = jiffies; 1202 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1203 if (time_after(jiffies, begin + 5 * HZ)) { 1204 ipoib_warn(priv, "timing out; %d sends not completed\n", 1205 p->tx_head - p->tx_tail); 1206 goto timeout; 1207 } 1208 1209 msleep(1); 1210 } 1211 } 1212 1213 timeout: 1214 1215 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1216 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1217 ipoib_dma_unmap_tx(priv, tx_req); 1218 dev_kfree_skb_any(tx_req->skb); 1219 ++p->tx_tail; 1220 netif_tx_lock_bh(p->dev); 1221 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1222 netif_queue_stopped(p->dev) && 1223 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1224 netif_wake_queue(p->dev); 1225 netif_tx_unlock_bh(p->dev); 1226 } 1227 1228 if (p->qp) 1229 ib_destroy_qp(p->qp); 1230 1231 vfree(p->tx_ring); 1232 kfree(p); 1233 } 1234 1235 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1236 struct ib_cm_event *event) 1237 { 1238 struct ipoib_cm_tx *tx = cm_id->context; 1239 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1240 struct net_device *dev = priv->dev; 1241 struct ipoib_neigh *neigh; 1242 unsigned long flags; 1243 int ret; 1244 1245 switch (event->event) { 1246 case IB_CM_DREQ_RECEIVED: 1247 ipoib_dbg(priv, "DREQ received.\n"); 1248 ib_send_cm_drep(cm_id, NULL, 0); 1249 break; 1250 case IB_CM_REP_RECEIVED: 1251 ipoib_dbg(priv, "REP received.\n"); 1252 ret = ipoib_cm_rep_handler(cm_id, event); 1253 if (ret) 1254 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1255 NULL, 0, NULL, 0); 1256 break; 1257 case IB_CM_REQ_ERROR: 1258 case IB_CM_REJ_RECEIVED: 1259 case IB_CM_TIMEWAIT_EXIT: 1260 ipoib_dbg(priv, "CM error %d.\n", event->event); 1261 netif_tx_lock_bh(dev); 1262 spin_lock_irqsave(&priv->lock, flags); 1263 neigh = tx->neigh; 1264 1265 if (neigh) { 1266 neigh->cm = NULL; 1267 ipoib_neigh_free(neigh); 1268 1269 tx->neigh = NULL; 1270 } 1271 1272 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1273 list_move(&tx->list, &priv->cm.reap_list); 1274 queue_work(priv->wq, &priv->cm.reap_task); 1275 } 1276 1277 spin_unlock_irqrestore(&priv->lock, flags); 1278 netif_tx_unlock_bh(dev); 1279 break; 1280 default: 1281 break; 1282 } 1283 1284 return 0; 1285 } 1286 1287 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1288 struct ipoib_neigh *neigh) 1289 { 1290 struct ipoib_dev_priv *priv = netdev_priv(dev); 1291 struct ipoib_cm_tx *tx; 1292 1293 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1294 if (!tx) 1295 return NULL; 1296 1297 neigh->cm = tx; 1298 tx->neigh = neigh; 1299 tx->path = path; 1300 tx->dev = dev; 1301 list_add(&tx->list, &priv->cm.start_list); 1302 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1303 queue_work(priv->wq, &priv->cm.start_task); 1304 return tx; 1305 } 1306 1307 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1308 { 1309 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1310 unsigned long flags; 1311 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1312 spin_lock_irqsave(&priv->lock, flags); 1313 list_move(&tx->list, &priv->cm.reap_list); 1314 queue_work(priv->wq, &priv->cm.reap_task); 1315 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1316 tx->neigh->daddr + 4); 1317 tx->neigh = NULL; 1318 spin_unlock_irqrestore(&priv->lock, flags); 1319 } 1320 } 1321 1322 #define QPN_AND_OPTIONS_OFFSET 4 1323 1324 static void ipoib_cm_tx_start(struct work_struct *work) 1325 { 1326 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1327 cm.start_task); 1328 struct net_device *dev = priv->dev; 1329 struct ipoib_neigh *neigh; 1330 struct ipoib_cm_tx *p; 1331 unsigned long flags; 1332 struct ipoib_path *path; 1333 int ret; 1334 1335 struct ib_sa_path_rec pathrec; 1336 u32 qpn; 1337 1338 netif_tx_lock_bh(dev); 1339 spin_lock_irqsave(&priv->lock, flags); 1340 1341 while (!list_empty(&priv->cm.start_list)) { 1342 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1343 list_del_init(&p->list); 1344 neigh = p->neigh; 1345 1346 qpn = IPOIB_QPN(neigh->daddr); 1347 /* 1348 * As long as the search is with these 2 locks, 1349 * path existence indicates its validity. 1350 */ 1351 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET); 1352 if (!path) { 1353 pr_info("%s ignore not valid path %pI6\n", 1354 __func__, 1355 neigh->daddr + QPN_AND_OPTIONS_OFFSET); 1356 goto free_neigh; 1357 } 1358 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1359 1360 spin_unlock_irqrestore(&priv->lock, flags); 1361 netif_tx_unlock_bh(dev); 1362 1363 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1364 1365 netif_tx_lock_bh(dev); 1366 spin_lock_irqsave(&priv->lock, flags); 1367 1368 if (ret) { 1369 free_neigh: 1370 neigh = p->neigh; 1371 if (neigh) { 1372 neigh->cm = NULL; 1373 ipoib_neigh_free(neigh); 1374 } 1375 list_del(&p->list); 1376 kfree(p); 1377 } 1378 } 1379 1380 spin_unlock_irqrestore(&priv->lock, flags); 1381 netif_tx_unlock_bh(dev); 1382 } 1383 1384 static void ipoib_cm_tx_reap(struct work_struct *work) 1385 { 1386 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1387 cm.reap_task); 1388 struct net_device *dev = priv->dev; 1389 struct ipoib_cm_tx *p; 1390 unsigned long flags; 1391 1392 netif_tx_lock_bh(dev); 1393 spin_lock_irqsave(&priv->lock, flags); 1394 1395 while (!list_empty(&priv->cm.reap_list)) { 1396 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1397 list_del(&p->list); 1398 spin_unlock_irqrestore(&priv->lock, flags); 1399 netif_tx_unlock_bh(dev); 1400 ipoib_cm_tx_destroy(p); 1401 netif_tx_lock_bh(dev); 1402 spin_lock_irqsave(&priv->lock, flags); 1403 } 1404 1405 spin_unlock_irqrestore(&priv->lock, flags); 1406 netif_tx_unlock_bh(dev); 1407 } 1408 1409 static void ipoib_cm_skb_reap(struct work_struct *work) 1410 { 1411 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1412 cm.skb_task); 1413 struct net_device *dev = priv->dev; 1414 struct sk_buff *skb; 1415 unsigned long flags; 1416 unsigned mtu = priv->mcast_mtu; 1417 1418 netif_tx_lock_bh(dev); 1419 spin_lock_irqsave(&priv->lock, flags); 1420 1421 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1422 spin_unlock_irqrestore(&priv->lock, flags); 1423 netif_tx_unlock_bh(dev); 1424 1425 if (skb->protocol == htons(ETH_P_IP)) 1426 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1427 #if IS_ENABLED(CONFIG_IPV6) 1428 else if (skb->protocol == htons(ETH_P_IPV6)) 1429 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1430 #endif 1431 dev_kfree_skb_any(skb); 1432 1433 netif_tx_lock_bh(dev); 1434 spin_lock_irqsave(&priv->lock, flags); 1435 } 1436 1437 spin_unlock_irqrestore(&priv->lock, flags); 1438 netif_tx_unlock_bh(dev); 1439 } 1440 1441 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1442 unsigned int mtu) 1443 { 1444 struct ipoib_dev_priv *priv = netdev_priv(dev); 1445 int e = skb_queue_empty(&priv->cm.skb_queue); 1446 1447 if (skb_dst(skb)) 1448 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1449 1450 skb_queue_tail(&priv->cm.skb_queue, skb); 1451 if (e) 1452 queue_work(priv->wq, &priv->cm.skb_task); 1453 } 1454 1455 static void ipoib_cm_rx_reap(struct work_struct *work) 1456 { 1457 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1458 cm.rx_reap_task)->dev); 1459 } 1460 1461 static void ipoib_cm_stale_task(struct work_struct *work) 1462 { 1463 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1464 cm.stale_task.work); 1465 struct ipoib_cm_rx *p; 1466 int ret; 1467 1468 spin_lock_irq(&priv->lock); 1469 while (!list_empty(&priv->cm.passive_ids)) { 1470 /* List is sorted by LRU, start from tail, 1471 * stop when we see a recently used entry */ 1472 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1473 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1474 break; 1475 list_move(&p->list, &priv->cm.rx_error_list); 1476 p->state = IPOIB_CM_RX_ERROR; 1477 spin_unlock_irq(&priv->lock); 1478 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1479 if (ret) 1480 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1481 spin_lock_irq(&priv->lock); 1482 } 1483 1484 if (!list_empty(&priv->cm.passive_ids)) 1485 queue_delayed_work(priv->wq, 1486 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1487 spin_unlock_irq(&priv->lock); 1488 } 1489 1490 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1491 char *buf) 1492 { 1493 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1494 1495 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1496 return sprintf(buf, "connected\n"); 1497 else 1498 return sprintf(buf, "datagram\n"); 1499 } 1500 1501 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1502 const char *buf, size_t count) 1503 { 1504 struct net_device *dev = to_net_dev(d); 1505 int ret; 1506 struct ipoib_dev_priv *priv = netdev_priv(dev); 1507 1508 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags)) 1509 return -EPERM; 1510 1511 if (!rtnl_trylock()) 1512 return restart_syscall(); 1513 1514 ret = ipoib_set_mode(dev, buf); 1515 1516 rtnl_unlock(); 1517 1518 if (!ret) 1519 return count; 1520 1521 return ret; 1522 } 1523 1524 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1525 1526 int ipoib_cm_add_mode_attr(struct net_device *dev) 1527 { 1528 return device_create_file(&dev->dev, &dev_attr_mode); 1529 } 1530 1531 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1532 { 1533 struct ipoib_dev_priv *priv = netdev_priv(dev); 1534 struct ib_srq_init_attr srq_init_attr = { 1535 .srq_type = IB_SRQT_BASIC, 1536 .attr = { 1537 .max_wr = ipoib_recvq_size, 1538 .max_sge = max_sge 1539 } 1540 }; 1541 1542 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1543 if (IS_ERR(priv->cm.srq)) { 1544 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1545 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1546 priv->ca->name, PTR_ERR(priv->cm.srq)); 1547 priv->cm.srq = NULL; 1548 return; 1549 } 1550 1551 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1552 if (!priv->cm.srq_ring) { 1553 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1554 priv->ca->name, ipoib_recvq_size); 1555 ib_destroy_srq(priv->cm.srq); 1556 priv->cm.srq = NULL; 1557 return; 1558 } 1559 1560 } 1561 1562 int ipoib_cm_dev_init(struct net_device *dev) 1563 { 1564 struct ipoib_dev_priv *priv = netdev_priv(dev); 1565 int max_srq_sge, i; 1566 1567 INIT_LIST_HEAD(&priv->cm.passive_ids); 1568 INIT_LIST_HEAD(&priv->cm.reap_list); 1569 INIT_LIST_HEAD(&priv->cm.start_list); 1570 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1571 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1572 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1573 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1574 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1575 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1576 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1577 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1578 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1579 1580 skb_queue_head_init(&priv->cm.skb_queue); 1581 1582 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge); 1583 1584 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge); 1585 ipoib_cm_create_srq(dev, max_srq_sge); 1586 if (ipoib_cm_has_srq(dev)) { 1587 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10; 1588 priv->cm.num_frags = max_srq_sge; 1589 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1590 priv->cm.max_cm_mtu, priv->cm.num_frags); 1591 } else { 1592 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1593 priv->cm.num_frags = IPOIB_CM_RX_SG; 1594 } 1595 1596 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1597 1598 if (ipoib_cm_has_srq(dev)) { 1599 for (i = 0; i < ipoib_recvq_size; ++i) { 1600 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1601 priv->cm.num_frags - 1, 1602 priv->cm.srq_ring[i].mapping, 1603 GFP_KERNEL)) { 1604 ipoib_warn(priv, "failed to allocate " 1605 "receive buffer %d\n", i); 1606 ipoib_cm_dev_cleanup(dev); 1607 return -ENOMEM; 1608 } 1609 1610 if (ipoib_cm_post_receive_srq(dev, i)) { 1611 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1612 "failed for buf %d\n", i); 1613 ipoib_cm_dev_cleanup(dev); 1614 return -EIO; 1615 } 1616 } 1617 } 1618 1619 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1620 return 0; 1621 } 1622 1623 void ipoib_cm_dev_cleanup(struct net_device *dev) 1624 { 1625 struct ipoib_dev_priv *priv = netdev_priv(dev); 1626 int ret; 1627 1628 if (!priv->cm.srq) 1629 return; 1630 1631 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1632 1633 ret = ib_destroy_srq(priv->cm.srq); 1634 if (ret) 1635 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1636 1637 priv->cm.srq = NULL; 1638 if (!priv->cm.srq_ring) 1639 return; 1640 1641 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1642 priv->cm.srq_ring = NULL; 1643 } 1644