drivers/infiniband/sw/rxe/rxe_net.c

   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 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         struct dst_entry *dst = NULL;
 190
 191         if (qp_type(qp) == IB_QPT_RC)
 192                 dst = sk_dst_get(qp->sk->sk);
 193
 194         if (!dst || !(dst->obsolete && dst->ops->check(dst, 0))) {
 195                 if (dst)
 196                         dst_release(dst);
 197
 198                 if (av->network_type == RDMA_NETWORK_IPV4) {
 199                         struct in_addr *saddr;
 200                         struct in_addr *daddr;
 201
 202                         saddr = &av->sgid_addr._sockaddr_in.sin_addr;
 203                         daddr = &av->dgid_addr._sockaddr_in.sin_addr;
 204                         dst = rxe_find_route4(rxe->ndev, saddr, daddr);
 205                 } else if (av->network_type == RDMA_NETWORK_IPV6) {
 206                         struct in6_addr *saddr6;
 207                         struct in6_addr *daddr6;
 208
 209                         saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
 210                         daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
 211                         dst = rxe_find_route6(rxe->ndev, saddr6, daddr6);
 212                 }
 213         }
 214
 215         return dst;
 216 }
 217
 218 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 219 {
 220         struct udphdr *udph;
 221         struct net_device *ndev = skb->dev;
 222         struct rxe_dev *rxe = net_to_rxe(ndev);
 223         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 224
 225         if (!rxe)
 226                 goto drop;
 227
 228         if (skb_linearize(skb)) {
 229                 pr_err("skb_linearize failed\n");
 230                 goto drop;
 231         }
 232
 233         udph = udp_hdr(skb);
 234         pkt->rxe = rxe;
 235         pkt->port_num = 1;
 236         pkt->hdr = (u8 *)(udph + 1);
 237         pkt->mask = RXE_GRH_MASK;
 238         pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
 239
 240         return rxe_rcv(skb);
 241 drop:
 242         kfree_skb(skb);
 243         return 0;
 244 }
 245
 246 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
 247                                            bool ipv6)
 248 {
 249         int err;
 250         struct socket *sock;
 251         struct udp_port_cfg udp_cfg = { };
 252         struct udp_tunnel_sock_cfg tnl_cfg = { };
 253
 254         if (ipv6) {
 255                 udp_cfg.family = AF_INET6;
 256                 udp_cfg.ipv6_v6only = 1;
 257         } else {
 258                 udp_cfg.family = AF_INET;
 259         }
 260
 261         udp_cfg.local_udp_port = port;
 262
 263         /* Create UDP socket */
 264         err = udp_sock_create(net, &udp_cfg, &sock);
 265         if (err < 0) {
 266                 pr_err("failed to create udp socket. err = %d\n", err);
 267                 return ERR_PTR(err);
 268         }
 269
 270         tnl_cfg.encap_type = 1;
 271         tnl_cfg.encap_rcv = rxe_udp_encap_recv;
 272
 273         /* Setup UDP tunnel */
 274         setup_udp_tunnel_sock(net, sock, &tnl_cfg);
 275
 276         return sock;
 277 }
 278
 279 void rxe_release_udp_tunnel(struct socket *sk)
 280 {
 281         if (sk)
 282                 udp_tunnel_sock_release(sk);
 283 }
 284
 285 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
 286                             __be16 dst_port)
 287 {
 288         struct udphdr *udph;
 289
 290         __skb_push(skb, sizeof(*udph));
 291         skb_reset_transport_header(skb);
 292         udph = udp_hdr(skb);
 293
 294         udph->dest = dst_port;
 295         udph->source = src_port;
 296         udph->len = htons(skb->len);
 297         udph->check = 0;
 298 }
 299
 300 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
 301                              __be32 saddr, __be32 daddr, __u8 proto,
 302                              __u8 tos, __u8 ttl, __be16 df, bool xnet)
 303 {
 304         struct iphdr *iph;
 305
 306         skb_scrub_packet(skb, xnet);
 307
 308         skb_clear_hash(skb);
 309         skb_dst_set(skb, dst_clone(dst));
 310         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 311
 312         skb_push(skb, sizeof(struct iphdr));
 313         skb_reset_network_header(skb);
 314
 315         iph = ip_hdr(skb);
 316
 317         iph->version    =       IPVERSION;
 318         iph->ihl        =       sizeof(struct iphdr) >> 2;
 319         iph->frag_off   =       df;
 320         iph->protocol   =       proto;
 321         iph->tos        =       tos;
 322         iph->daddr      =       daddr;
 323         iph->saddr      =       saddr;
 324         iph->ttl        =       ttl;
 325         __ip_select_ident(dev_net(dst->dev), iph,
 326                           skb_shinfo(skb)->gso_segs ?: 1);
 327         iph->tot_len = htons(skb->len);
 328         ip_send_check(iph);
 329 }
 330
 331 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
 332                              struct in6_addr *saddr, struct in6_addr *daddr,
 333                              __u8 proto, __u8 prio, __u8 ttl)
 334 {
 335         struct ipv6hdr *ip6h;
 336
 337         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 338         IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
 339                             | IPSKB_REROUTED);
 340         skb_dst_set(skb, dst);
 341
 342         __skb_push(skb, sizeof(*ip6h));
 343         skb_reset_network_header(skb);
 344         ip6h              = ipv6_hdr(skb);
 345         ip6_flow_hdr(ip6h, prio, htonl(0));
 346         ip6h->payload_len = htons(skb->len);
 347         ip6h->nexthdr     = proto;
 348         ip6h->hop_limit   = ttl;
 349         ip6h->daddr       = *daddr;
 350         ip6h->saddr       = *saddr;
 351         ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
 352 }
 353
 354 static int prepare4(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 355                     struct sk_buff *skb, struct rxe_av *av)
 356 {
 357         struct rxe_qp *qp = pkt->qp;
 358         struct dst_entry *dst;
 359         bool xnet = false;
 360         __be16 df = htons(IP_DF);
 361         struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
 362         struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
 363
 364         dst = rxe_find_route(rxe, qp, av);
 365         if (!dst) {
 366                 pr_err("Host not reachable\n");
 367                 return -EHOSTUNREACH;
 368         }
 369
 370         if (!memcmp(saddr, daddr, sizeof(*daddr)))
 371                 pkt->mask |= RXE_LOOPBACK_MASK;
 372
 373         prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT),
 374                         htons(ROCE_V2_UDP_DPORT));
 375
 376         prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
 377                          av->grh.traffic_class, av->grh.hop_limit, df, xnet);
 378
 379         if (qp_type(qp) == IB_QPT_RC)
 380                 sk_dst_set(qp->sk->sk, dst);
 381         else
 382                 dst_release(dst);
 383
 384         return 0;
 385 }
 386
 387 static int prepare6(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 388                     struct sk_buff *skb, struct rxe_av *av)
 389 {
 390         struct rxe_qp *qp = pkt->qp;
 391         struct dst_entry *dst = NULL;
 392         struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
 393         struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
 394
 395         dst = rxe_find_route(rxe, qp, av);
 396         if (!dst) {
 397                 pr_err("Host not reachable\n");
 398                 return -EHOSTUNREACH;
 399         }
 400
 401         if (!memcmp(saddr, daddr, sizeof(*daddr)))
 402                 pkt->mask |= RXE_LOOPBACK_MASK;
 403
 404         prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT),
 405                         htons(ROCE_V2_UDP_DPORT));
 406
 407         prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
 408                          av->grh.traffic_class,
 409                          av->grh.hop_limit);
 410
 411         if (qp_type(qp) == IB_QPT_RC)
 412                 sk_dst_set(qp->sk->sk, dst);
 413         else
 414                 dst_release(dst);
 415
 416         return 0;
 417 }
 418
 419 int rxe_prepare(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 420                 struct sk_buff *skb, u32 *crc)
 421 {
 422         int err = 0;
 423         struct rxe_av *av = rxe_get_av(pkt);
 424
 425         if (av->network_type == RDMA_NETWORK_IPV4)
 426                 err = prepare4(rxe, pkt, skb, av);
 427         else if (av->network_type == RDMA_NETWORK_IPV6)
 428                 err = prepare6(rxe, pkt, skb, av);
 429
 430         *crc = rxe_icrc_hdr(pkt, skb);
 431
 432         return err;
 433 }
 434
 435 static void rxe_skb_tx_dtor(struct sk_buff *skb)
 436 {
 437         struct sock *sk = skb->sk;
 438         struct rxe_qp *qp = sk->sk_user_data;
 439         int skb_out = atomic_dec_return(&qp->skb_out);
 440
 441         if (unlikely(qp->need_req_skb &&
 442                      skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
 443                 rxe_run_task(&qp->req.task, 1);
 444
 445         rxe_drop_ref(qp);
 446 }
 447
 448 int rxe_send(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, struct sk_buff *skb)
 449 {
 450         struct sk_buff *nskb;
 451         struct rxe_av *av;
 452         int err;
 453
 454         av = rxe_get_av(pkt);
 455
 456         nskb = skb_clone(skb, GFP_ATOMIC);
 457         if (!nskb)
 458                 return -ENOMEM;
 459
 460         nskb->destructor = rxe_skb_tx_dtor;
 461         nskb->sk = pkt->qp->sk->sk;
 462
 463         if (av->network_type == RDMA_NETWORK_IPV4) {
 464                 err = ip_local_out(dev_net(skb_dst(skb)->dev), nskb->sk, nskb);
 465         } else if (av->network_type == RDMA_NETWORK_IPV6) {
 466                 err = ip6_local_out(dev_net(skb_dst(skb)->dev), nskb->sk, nskb);
 467         } else {
 468                 pr_err("Unknown layer 3 protocol: %d\n", av->network_type);
 469                 kfree_skb(nskb);
 470                 return -EINVAL;
 471         }
 472
 473         if (unlikely(net_xmit_eval(err))) {
 474                 pr_debug("error sending packet: %d\n", err);
 475                 return -EAGAIN;
 476         }
 477
 478         rxe_add_ref(pkt->qp);
 479         atomic_inc(&pkt->qp->skb_out);
 480         kfree_skb(skb);
 481
 482         return 0;
 483 }
 484
 485 int rxe_loopback(struct sk_buff *skb)
 486 {
 487         return rxe_rcv(skb);
 488 }
 489
 490 static inline int addr_same(struct rxe_dev *rxe, struct rxe_av *av)
 491 {
 492         return rxe->port.port_guid == av->grh.dgid.global.interface_id;
 493 }
 494
 495 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
 496                                 int paylen, struct rxe_pkt_info *pkt)
 497 {
 498         unsigned int hdr_len;
 499         struct sk_buff *skb;
 500
 501         if (av->network_type == RDMA_NETWORK_IPV4)
 502                 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
 503                         sizeof(struct iphdr);
 504         else
 505                 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
 506                         sizeof(struct ipv6hdr);
 507
 508         skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(rxe->ndev),
 509                         GFP_ATOMIC);
 510         if (unlikely(!skb))
 511                 return NULL;
 512
 513         skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(rxe->ndev));
 514
 515         skb->dev        = rxe->ndev;
 516         if (av->network_type == RDMA_NETWORK_IPV4)
 517                 skb->protocol = htons(ETH_P_IP);
 518         else
 519                 skb->protocol = htons(ETH_P_IPV6);
 520
 521         pkt->rxe        = rxe;
 522         pkt->port_num   = 1;
 523         pkt->hdr        = skb_put(skb, paylen);
 524         pkt->mask       |= RXE_GRH_MASK;
 525
 526         memset(pkt->hdr, 0, paylen);
 527
 528         return skb;
 529 }
 530
 531 /*
 532  * this is required by rxe_cfg to match rxe devices in
 533  * /sys/class/infiniband up with their underlying ethernet devices
 534  */
 535 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
 536 {
 537         return rxe->ndev->name;
 538 }
 539
 540 enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num)
 541 {
 542         return IB_LINK_LAYER_ETHERNET;
 543 }
 544
 545 struct rxe_dev *rxe_net_add(struct net_device *ndev)
 546 {
 547         int err;
 548         struct rxe_dev *rxe = NULL;
 549
 550         rxe = (struct rxe_dev *)ib_alloc_device(sizeof(*rxe));
 551         if (!rxe)
 552                 return NULL;
 553
 554         rxe->ndev = ndev;
 555
 556         err = rxe_add(rxe, ndev->mtu);
 557         if (err) {
 558                 ib_dealloc_device(&rxe->ib_dev);
 559                 return NULL;
 560         }
 561
 562         spin_lock_bh(&dev_list_lock);
 563         list_add_tail(&rxe->list, &rxe_dev_list);
 564         spin_unlock_bh(&dev_list_lock);
 565         return rxe;
 566 }
 567
 568 void rxe_remove_all(void)
 569 {
 570         spin_lock_bh(&dev_list_lock);
 571         while (!list_empty(&rxe_dev_list)) {
 572                 struct rxe_dev *rxe =
 573                         list_first_entry(&rxe_dev_list, struct rxe_dev, list);
 574
 575                 list_del(&rxe->list);
 576                 spin_unlock_bh(&dev_list_lock);
 577                 rxe_remove(rxe);
 578                 spin_lock_bh(&dev_list_lock);
 579         }
 580         spin_unlock_bh(&dev_list_lock);
 581 }
 582 EXPORT_SYMBOL(rxe_remove_all);
 583
 584 static void rxe_port_event(struct rxe_dev *rxe,
 585                            enum ib_event_type event)
 586 {
 587         struct ib_event ev;
 588
 589         ev.device = &rxe->ib_dev;
 590         ev.element.port_num = 1;
 591         ev.event = event;
 592
 593         ib_dispatch_event(&ev);
 594 }
 595
 596 /* Caller must hold net_info_lock */
 597 void rxe_port_up(struct rxe_dev *rxe)
 598 {
 599         struct rxe_port *port;
 600
 601         port = &rxe->port;
 602         port->attr.state = IB_PORT_ACTIVE;
 603         port->attr.phys_state = IB_PHYS_STATE_LINK_UP;
 604
 605         rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
 606         pr_info("set %s active\n", rxe->ib_dev.name);
 607 }
 608
 609 /* Caller must hold net_info_lock */
 610 void rxe_port_down(struct rxe_dev *rxe)
 611 {
 612         struct rxe_port *port;
 613
 614         port = &rxe->port;
 615         port->attr.state = IB_PORT_DOWN;
 616         port->attr.phys_state = IB_PHYS_STATE_LINK_DOWN;
 617
 618         rxe_port_event(rxe, IB_EVENT_PORT_ERR);
 619         pr_info("set %s down\n", rxe->ib_dev.name);
 620 }
 621
 622 static int rxe_notify(struct notifier_block *not_blk,
 623                       unsigned long event,
 624                       void *arg)
 625 {
 626         struct net_device *ndev = netdev_notifier_info_to_dev(arg);
 627         struct rxe_dev *rxe = net_to_rxe(ndev);
 628
 629         if (!rxe)
 630                 goto out;
 631
 632         switch (event) {
 633         case NETDEV_UNREGISTER:
 634                 list_del(&rxe->list);
 635                 rxe_remove(rxe);
 636                 break;
 637         case NETDEV_UP:
 638                 rxe_port_up(rxe);
 639                 break;
 640         case NETDEV_DOWN:
 641                 rxe_port_down(rxe);
 642                 break;
 643         case NETDEV_CHANGEMTU:
 644                 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
 645                 rxe_set_mtu(rxe, ndev->mtu);
 646                 break;
 647         case NETDEV_REBOOT:
 648         case NETDEV_CHANGE:
 649         case NETDEV_GOING_DOWN:
 650         case NETDEV_CHANGEADDR:
 651         case NETDEV_CHANGENAME:
 652         case NETDEV_FEAT_CHANGE:
 653         default:
 654                 pr_info("ignoring netdev event = %ld for %s\n",
 655                         event, ndev->name);
 656                 break;
 657         }
 658 out:
 659         return NOTIFY_OK;
 660 }
 661
 662 struct notifier_block rxe_net_notifier = {
 663         .notifier_call = rxe_notify,
 664 };
 665
 666 static int rxe_net_ipv4_init(void)
 667 {
 668         recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
 669                                 htons(ROCE_V2_UDP_DPORT), false);
 670         if (IS_ERR(recv_sockets.sk4)) {
 671                 recv_sockets.sk4 = NULL;
 672                 pr_err("Failed to create IPv4 UDP tunnel\n");
 673                 return -1;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int rxe_net_ipv6_init(void)
 680 {
 681 #if IS_ENABLED(CONFIG_IPV6)
 682
 683         recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
 684                                                 htons(ROCE_V2_UDP_DPORT), true);
 685         if (IS_ERR(recv_sockets.sk6)) {
 686                 recv_sockets.sk6 = NULL;
 687                 pr_err("Failed to create IPv6 UDP tunnel\n");
 688                 return -1;
 689         }
 690 #endif
 691         return 0;
 692 }
 693
 694 void rxe_net_exit(void)
 695 {
 696         rxe_release_udp_tunnel(recv_sockets.sk6);
 697         rxe_release_udp_tunnel(recv_sockets.sk4);
 698         unregister_netdevice_notifier(&rxe_net_notifier);
 699 }
 700
 701 int rxe_net_init(void)
 702 {
 703         int err;
 704
 705         recv_sockets.sk6 = NULL;
 706
 707         err = rxe_net_ipv4_init();
 708         if (err)
 709                 return err;
 710         err = rxe_net_ipv6_init();
 711         if (err)
 712                 goto err_out;
 713         err = register_netdevice_notifier(&rxe_net_notifier);
 714         if (err) {
 715                 pr_err("Failed to register netdev notifier\n");
 716                 goto err_out;
 717         }
 718         return 0;
 719 err_out:
 720         rxe_net_exit();
 721         return err;
 722 }