1 /* 2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. 3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/skbuff.h> 35 #include <linux/if_arp.h> 36 #include <linux/netdevice.h> 37 #include <linux/if.h> 38 #include <linux/if_vlan.h> 39 #include <net/udp_tunnel.h> 40 #include <net/sch_generic.h> 41 #include <linux/netfilter.h> 42 #include <rdma/ib_addr.h> 43 44 #include "rxe.h" 45 #include "rxe_net.h" 46 #include "rxe_loc.h" 47 48 static LIST_HEAD(rxe_dev_list); 49 static DEFINE_SPINLOCK(dev_list_lock); /* spinlock for device list */ 50 51 struct rxe_dev *net_to_rxe(struct net_device *ndev) 52 { 53 struct rxe_dev *rxe; 54 struct rxe_dev *found = NULL; 55 56 spin_lock_bh(&dev_list_lock); 57 list_for_each_entry(rxe, &rxe_dev_list, list) { 58 if (rxe->ndev == ndev) { 59 found = rxe; 60 break; 61 } 62 } 63 spin_unlock_bh(&dev_list_lock); 64 65 return found; 66 } 67 68 struct rxe_dev *get_rxe_by_name(const char *name) 69 { 70 struct rxe_dev *rxe; 71 struct rxe_dev *found = NULL; 72 73 spin_lock_bh(&dev_list_lock); 74 list_for_each_entry(rxe, &rxe_dev_list, list) { 75 if (!strcmp(name, rxe->ib_dev.name)) { 76 found = rxe; 77 break; 78 } 79 } 80 spin_unlock_bh(&dev_list_lock); 81 return found; 82 } 83 84 85 static struct rxe_recv_sockets recv_sockets; 86 87 struct device *rxe_dma_device(struct rxe_dev *rxe) 88 { 89 struct net_device *ndev; 90 91 ndev = rxe->ndev; 92 93 if (is_vlan_dev(ndev)) 94 ndev = vlan_dev_real_dev(ndev); 95 96 return ndev->dev.parent; 97 } 98 99 int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid) 100 { 101 int err; 102 unsigned char ll_addr[ETH_ALEN]; 103 104 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); 105 err = dev_mc_add(rxe->ndev, ll_addr); 106 107 return err; 108 } 109 110 int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid) 111 { 112 int err; 113 unsigned char ll_addr[ETH_ALEN]; 114 115 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); 116 err = dev_mc_del(rxe->ndev, ll_addr); 117 118 return err; 119 } 120 121 static struct dst_entry *rxe_find_route4(struct net_device *ndev, 122 struct in_addr *saddr, 123 struct in_addr *daddr) 124 { 125 struct rtable *rt; 126 struct flowi4 fl = { { 0 } }; 127 128 memset(&fl, 0, sizeof(fl)); 129 fl.flowi4_oif = ndev->ifindex; 130 memcpy(&fl.saddr, saddr, sizeof(*saddr)); 131 memcpy(&fl.daddr, daddr, sizeof(*daddr)); 132 fl.flowi4_proto = IPPROTO_UDP; 133 134 rt = ip_route_output_key(&init_net, &fl); 135 if (IS_ERR(rt)) { 136 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr); 137 return NULL; 138 } 139 140 return &rt->dst; 141 } 142 143 #if IS_ENABLED(CONFIG_IPV6) 144 static struct dst_entry *rxe_find_route6(struct net_device *ndev, 145 struct in6_addr *saddr, 146 struct in6_addr *daddr) 147 { 148 struct dst_entry *ndst; 149 struct flowi6 fl6 = { { 0 } }; 150 151 memset(&fl6, 0, sizeof(fl6)); 152 fl6.flowi6_oif = ndev->ifindex; 153 memcpy(&fl6.saddr, saddr, sizeof(*saddr)); 154 memcpy(&fl6.daddr, daddr, sizeof(*daddr)); 155 fl6.flowi6_proto = IPPROTO_UDP; 156 157 if (unlikely(ipv6_stub->ipv6_dst_lookup(sock_net(recv_sockets.sk6->sk), 158 recv_sockets.sk6->sk, &ndst, &fl6))) { 159 pr_err_ratelimited("no route to %pI6\n", daddr); 160 goto put; 161 } 162 163 if (unlikely(ndst->error)) { 164 pr_err("no route to %pI6\n", daddr); 165 goto put; 166 } 167 168 return ndst; 169 put: 170 dst_release(ndst); 171 return NULL; 172 } 173 174 #else 175 176 static struct dst_entry *rxe_find_route6(struct net_device *ndev, 177 struct in6_addr *saddr, 178 struct in6_addr *daddr) 179 { 180 return NULL; 181 } 182 183 #endif 184 185 static struct dst_entry *rxe_find_route(struct rxe_dev *rxe, 186 struct rxe_qp *qp, 187 struct rxe_av *av) 188 { 189 const struct ib_gid_attr *attr; 190 struct dst_entry *dst = NULL; 191 struct net_device *ndev; 192 193 attr = rdma_get_gid_attr(&rxe->ib_dev, qp->attr.port_num, 194 av->grh.sgid_index); 195 if (IS_ERR(attr)) 196 return NULL; 197 ndev = attr->ndev; 198 199 if (qp_type(qp) == IB_QPT_RC) 200 dst = sk_dst_get(qp->sk->sk); 201 202 if (!dst || !dst_check(dst, qp->dst_cookie)) { 203 if (dst) 204 dst_release(dst); 205 206 if (av->network_type == RDMA_NETWORK_IPV4) { 207 struct in_addr *saddr; 208 struct in_addr *daddr; 209 210 saddr = &av->sgid_addr._sockaddr_in.sin_addr; 211 daddr = &av->dgid_addr._sockaddr_in.sin_addr; 212 dst = rxe_find_route4(ndev, saddr, daddr); 213 } else if (av->network_type == RDMA_NETWORK_IPV6) { 214 struct in6_addr *saddr6; 215 struct in6_addr *daddr6; 216 217 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr; 218 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr; 219 dst = rxe_find_route6(ndev, saddr6, daddr6); 220 #if IS_ENABLED(CONFIG_IPV6) 221 if (dst) 222 qp->dst_cookie = 223 rt6_get_cookie((struct rt6_info *)dst); 224 #endif 225 } 226 227 if (dst && (qp_type(qp) == IB_QPT_RC)) { 228 dst_hold(dst); 229 sk_dst_set(qp->sk->sk, dst); 230 } 231 } 232 rdma_put_gid_attr(attr); 233 return dst; 234 } 235 236 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 237 { 238 struct udphdr *udph; 239 struct net_device *ndev = skb->dev; 240 struct net_device *rdev = ndev; 241 struct rxe_dev *rxe = net_to_rxe(ndev); 242 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 243 244 if (!rxe && is_vlan_dev(rdev)) { 245 rdev = vlan_dev_real_dev(ndev); 246 rxe = net_to_rxe(rdev); 247 } 248 if (!rxe) 249 goto drop; 250 251 if (skb_linearize(skb)) { 252 pr_err("skb_linearize failed\n"); 253 goto drop; 254 } 255 256 udph = udp_hdr(skb); 257 pkt->rxe = rxe; 258 pkt->port_num = 1; 259 pkt->hdr = (u8 *)(udph + 1); 260 pkt->mask = RXE_GRH_MASK; 261 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph); 262 263 rxe_rcv(skb); 264 265 return 0; 266 drop: 267 kfree_skb(skb); 268 269 return 0; 270 } 271 272 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port, 273 bool ipv6) 274 { 275 int err; 276 struct socket *sock; 277 struct udp_port_cfg udp_cfg = { }; 278 struct udp_tunnel_sock_cfg tnl_cfg = { }; 279 280 if (ipv6) { 281 udp_cfg.family = AF_INET6; 282 udp_cfg.ipv6_v6only = 1; 283 } else { 284 udp_cfg.family = AF_INET; 285 } 286 287 udp_cfg.local_udp_port = port; 288 289 /* Create UDP socket */ 290 err = udp_sock_create(net, &udp_cfg, &sock); 291 if (err < 0) { 292 pr_err("failed to create udp socket. err = %d\n", err); 293 return ERR_PTR(err); 294 } 295 296 tnl_cfg.encap_type = 1; 297 tnl_cfg.encap_rcv = rxe_udp_encap_recv; 298 299 /* Setup UDP tunnel */ 300 setup_udp_tunnel_sock(net, sock, &tnl_cfg); 301 302 return sock; 303 } 304 305 static void rxe_release_udp_tunnel(struct socket *sk) 306 { 307 if (sk) 308 udp_tunnel_sock_release(sk); 309 } 310 311 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port, 312 __be16 dst_port) 313 { 314 struct udphdr *udph; 315 316 __skb_push(skb, sizeof(*udph)); 317 skb_reset_transport_header(skb); 318 udph = udp_hdr(skb); 319 320 udph->dest = dst_port; 321 udph->source = src_port; 322 udph->len = htons(skb->len); 323 udph->check = 0; 324 } 325 326 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb, 327 __be32 saddr, __be32 daddr, __u8 proto, 328 __u8 tos, __u8 ttl, __be16 df, bool xnet) 329 { 330 struct iphdr *iph; 331 332 skb_scrub_packet(skb, xnet); 333 334 skb_clear_hash(skb); 335 skb_dst_set(skb, dst_clone(dst)); 336 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 337 338 skb_push(skb, sizeof(struct iphdr)); 339 skb_reset_network_header(skb); 340 341 iph = ip_hdr(skb); 342 343 iph->version = IPVERSION; 344 iph->ihl = sizeof(struct iphdr) >> 2; 345 iph->frag_off = df; 346 iph->protocol = proto; 347 iph->tos = tos; 348 iph->daddr = daddr; 349 iph->saddr = saddr; 350 iph->ttl = ttl; 351 __ip_select_ident(dev_net(dst->dev), iph, 352 skb_shinfo(skb)->gso_segs ?: 1); 353 iph->tot_len = htons(skb->len); 354 ip_send_check(iph); 355 } 356 357 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb, 358 struct in6_addr *saddr, struct in6_addr *daddr, 359 __u8 proto, __u8 prio, __u8 ttl) 360 { 361 struct ipv6hdr *ip6h; 362 363 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 364 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED 365 | IPSKB_REROUTED); 366 skb_dst_set(skb, dst_clone(dst)); 367 368 __skb_push(skb, sizeof(*ip6h)); 369 skb_reset_network_header(skb); 370 ip6h = ipv6_hdr(skb); 371 ip6_flow_hdr(ip6h, prio, htonl(0)); 372 ip6h->payload_len = htons(skb->len); 373 ip6h->nexthdr = proto; 374 ip6h->hop_limit = ttl; 375 ip6h->daddr = *daddr; 376 ip6h->saddr = *saddr; 377 ip6h->payload_len = htons(skb->len - sizeof(*ip6h)); 378 } 379 380 static int prepare4(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, 381 struct sk_buff *skb, struct rxe_av *av) 382 { 383 struct rxe_qp *qp = pkt->qp; 384 struct dst_entry *dst; 385 bool xnet = false; 386 __be16 df = htons(IP_DF); 387 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr; 388 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr; 389 390 dst = rxe_find_route(rxe, qp, av); 391 if (!dst) { 392 pr_err("Host not reachable\n"); 393 return -EHOSTUNREACH; 394 } 395 396 if (!memcmp(saddr, daddr, sizeof(*daddr))) 397 pkt->mask |= RXE_LOOPBACK_MASK; 398 399 prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT), 400 htons(ROCE_V2_UDP_DPORT)); 401 402 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP, 403 av->grh.traffic_class, av->grh.hop_limit, df, xnet); 404 405 dst_release(dst); 406 return 0; 407 } 408 409 static int prepare6(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, 410 struct sk_buff *skb, struct rxe_av *av) 411 { 412 struct rxe_qp *qp = pkt->qp; 413 struct dst_entry *dst; 414 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr; 415 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr; 416 417 dst = rxe_find_route(rxe, qp, av); 418 if (!dst) { 419 pr_err("Host not reachable\n"); 420 return -EHOSTUNREACH; 421 } 422 423 if (!memcmp(saddr, daddr, sizeof(*daddr))) 424 pkt->mask |= RXE_LOOPBACK_MASK; 425 426 prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT), 427 htons(ROCE_V2_UDP_DPORT)); 428 429 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP, 430 av->grh.traffic_class, 431 av->grh.hop_limit); 432 433 dst_release(dst); 434 return 0; 435 } 436 437 int rxe_prepare(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, 438 struct sk_buff *skb, u32 *crc) 439 { 440 int err = 0; 441 struct rxe_av *av = rxe_get_av(pkt); 442 443 if (av->network_type == RDMA_NETWORK_IPV4) 444 err = prepare4(rxe, pkt, skb, av); 445 else if (av->network_type == RDMA_NETWORK_IPV6) 446 err = prepare6(rxe, pkt, skb, av); 447 448 *crc = rxe_icrc_hdr(pkt, skb); 449 450 return err; 451 } 452 453 static void rxe_skb_tx_dtor(struct sk_buff *skb) 454 { 455 struct sock *sk = skb->sk; 456 struct rxe_qp *qp = sk->sk_user_data; 457 int skb_out = atomic_dec_return(&qp->skb_out); 458 459 if (unlikely(qp->need_req_skb && 460 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW)) 461 rxe_run_task(&qp->req.task, 1); 462 463 rxe_drop_ref(qp); 464 } 465 466 int rxe_send(struct rxe_pkt_info *pkt, struct sk_buff *skb) 467 { 468 struct rxe_av *av; 469 int err; 470 471 av = rxe_get_av(pkt); 472 473 skb->destructor = rxe_skb_tx_dtor; 474 skb->sk = pkt->qp->sk->sk; 475 476 rxe_add_ref(pkt->qp); 477 atomic_inc(&pkt->qp->skb_out); 478 479 if (av->network_type == RDMA_NETWORK_IPV4) { 480 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 481 } else if (av->network_type == RDMA_NETWORK_IPV6) { 482 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 483 } else { 484 pr_err("Unknown layer 3 protocol: %d\n", av->network_type); 485 atomic_dec(&pkt->qp->skb_out); 486 rxe_drop_ref(pkt->qp); 487 kfree_skb(skb); 488 return -EINVAL; 489 } 490 491 if (unlikely(net_xmit_eval(err))) { 492 pr_debug("error sending packet: %d\n", err); 493 return -EAGAIN; 494 } 495 496 return 0; 497 } 498 499 void rxe_loopback(struct sk_buff *skb) 500 { 501 rxe_rcv(skb); 502 } 503 504 static inline int addr_same(struct rxe_dev *rxe, struct rxe_av *av) 505 { 506 return rxe->port.port_guid == av->grh.dgid.global.interface_id; 507 } 508 509 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av, 510 int paylen, struct rxe_pkt_info *pkt) 511 { 512 unsigned int hdr_len; 513 struct sk_buff *skb; 514 struct net_device *ndev; 515 const struct ib_gid_attr *attr; 516 const int port_num = 1; 517 518 attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index); 519 if (IS_ERR(attr)) 520 return NULL; 521 ndev = attr->ndev; 522 523 if (av->network_type == RDMA_NETWORK_IPV4) 524 hdr_len = ETH_HLEN + sizeof(struct udphdr) + 525 sizeof(struct iphdr); 526 else 527 hdr_len = ETH_HLEN + sizeof(struct udphdr) + 528 sizeof(struct ipv6hdr); 529 530 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev), 531 GFP_ATOMIC); 532 533 if (unlikely(!skb)) 534 goto out; 535 536 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(rxe->ndev)); 537 538 skb->dev = ndev; 539 if (av->network_type == RDMA_NETWORK_IPV4) 540 skb->protocol = htons(ETH_P_IP); 541 else 542 skb->protocol = htons(ETH_P_IPV6); 543 544 pkt->rxe = rxe; 545 pkt->port_num = port_num; 546 pkt->hdr = skb_put_zero(skb, paylen); 547 pkt->mask |= RXE_GRH_MASK; 548 549 out: 550 rdma_put_gid_attr(attr); 551 return skb; 552 } 553 554 /* 555 * this is required by rxe_cfg to match rxe devices in 556 * /sys/class/infiniband up with their underlying ethernet devices 557 */ 558 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num) 559 { 560 return rxe->ndev->name; 561 } 562 563 enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num) 564 { 565 return IB_LINK_LAYER_ETHERNET; 566 } 567 568 struct rxe_dev *rxe_net_add(struct net_device *ndev) 569 { 570 int err; 571 struct rxe_dev *rxe = NULL; 572 573 rxe = (struct rxe_dev *)ib_alloc_device(sizeof(*rxe)); 574 if (!rxe) 575 return NULL; 576 577 rxe->ndev = ndev; 578 579 err = rxe_add(rxe, ndev->mtu); 580 if (err) { 581 ib_dealloc_device(&rxe->ib_dev); 582 return NULL; 583 } 584 585 spin_lock_bh(&dev_list_lock); 586 list_add_tail(&rxe->list, &rxe_dev_list); 587 spin_unlock_bh(&dev_list_lock); 588 return rxe; 589 } 590 591 void rxe_remove_all(void) 592 { 593 spin_lock_bh(&dev_list_lock); 594 while (!list_empty(&rxe_dev_list)) { 595 struct rxe_dev *rxe = 596 list_first_entry(&rxe_dev_list, struct rxe_dev, list); 597 598 list_del(&rxe->list); 599 spin_unlock_bh(&dev_list_lock); 600 rxe_remove(rxe); 601 spin_lock_bh(&dev_list_lock); 602 } 603 spin_unlock_bh(&dev_list_lock); 604 } 605 606 static void rxe_port_event(struct rxe_dev *rxe, 607 enum ib_event_type event) 608 { 609 struct ib_event ev; 610 611 ev.device = &rxe->ib_dev; 612 ev.element.port_num = 1; 613 ev.event = event; 614 615 ib_dispatch_event(&ev); 616 } 617 618 /* Caller must hold net_info_lock */ 619 void rxe_port_up(struct rxe_dev *rxe) 620 { 621 struct rxe_port *port; 622 623 port = &rxe->port; 624 port->attr.state = IB_PORT_ACTIVE; 625 port->attr.phys_state = IB_PHYS_STATE_LINK_UP; 626 627 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE); 628 pr_info("set %s active\n", rxe->ib_dev.name); 629 } 630 631 /* Caller must hold net_info_lock */ 632 void rxe_port_down(struct rxe_dev *rxe) 633 { 634 struct rxe_port *port; 635 636 port = &rxe->port; 637 port->attr.state = IB_PORT_DOWN; 638 port->attr.phys_state = IB_PHYS_STATE_LINK_DOWN; 639 640 rxe_port_event(rxe, IB_EVENT_PORT_ERR); 641 pr_info("set %s down\n", rxe->ib_dev.name); 642 } 643 644 static int rxe_notify(struct notifier_block *not_blk, 645 unsigned long event, 646 void *arg) 647 { 648 struct net_device *ndev = netdev_notifier_info_to_dev(arg); 649 struct rxe_dev *rxe = net_to_rxe(ndev); 650 651 if (!rxe) 652 goto out; 653 654 switch (event) { 655 case NETDEV_UNREGISTER: 656 list_del(&rxe->list); 657 rxe_remove(rxe); 658 break; 659 case NETDEV_UP: 660 rxe_port_up(rxe); 661 break; 662 case NETDEV_DOWN: 663 rxe_port_down(rxe); 664 break; 665 case NETDEV_CHANGEMTU: 666 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu); 667 rxe_set_mtu(rxe, ndev->mtu); 668 break; 669 case NETDEV_CHANGE: 670 if (netif_running(ndev) && netif_carrier_ok(ndev)) 671 rxe_port_up(rxe); 672 else 673 rxe_port_down(rxe); 674 break; 675 case NETDEV_REBOOT: 676 case NETDEV_GOING_DOWN: 677 case NETDEV_CHANGEADDR: 678 case NETDEV_CHANGENAME: 679 case NETDEV_FEAT_CHANGE: 680 default: 681 pr_info("ignoring netdev event = %ld for %s\n", 682 event, ndev->name); 683 break; 684 } 685 out: 686 return NOTIFY_OK; 687 } 688 689 static struct notifier_block rxe_net_notifier = { 690 .notifier_call = rxe_notify, 691 }; 692 693 static int rxe_net_ipv4_init(void) 694 { 695 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net, 696 htons(ROCE_V2_UDP_DPORT), false); 697 if (IS_ERR(recv_sockets.sk4)) { 698 recv_sockets.sk4 = NULL; 699 pr_err("Failed to create IPv4 UDP tunnel\n"); 700 return -1; 701 } 702 703 return 0; 704 } 705 706 static int rxe_net_ipv6_init(void) 707 { 708 #if IS_ENABLED(CONFIG_IPV6) 709 710 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net, 711 htons(ROCE_V2_UDP_DPORT), true); 712 if (IS_ERR(recv_sockets.sk6)) { 713 recv_sockets.sk6 = NULL; 714 pr_err("Failed to create IPv6 UDP tunnel\n"); 715 return -1; 716 } 717 #endif 718 return 0; 719 } 720 721 void rxe_net_exit(void) 722 { 723 rxe_release_udp_tunnel(recv_sockets.sk6); 724 rxe_release_udp_tunnel(recv_sockets.sk4); 725 unregister_netdevice_notifier(&rxe_net_notifier); 726 } 727 728 int rxe_net_init(void) 729 { 730 int err; 731 732 recv_sockets.sk6 = NULL; 733 734 err = rxe_net_ipv4_init(); 735 if (err) 736 return err; 737 err = rxe_net_ipv6_init(); 738 if (err) 739 goto err_out; 740 err = register_netdevice_notifier(&rxe_net_notifier); 741 if (err) { 742 pr_err("Failed to register netdev notifier\n"); 743 goto err_out; 744 } 745 return 0; 746 err_out: 747 rxe_net_exit(); 748 return err; 749 } 750