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 struct rxe_recv_sockets recv_sockets;
  49
  50 struct device *rxe_dma_device(struct rxe_dev *rxe)
  51 {
  52         struct net_device *ndev;
  53
  54         ndev = rxe->ndev;
  55
  56         if (is_vlan_dev(ndev))
  57                 ndev = vlan_dev_real_dev(ndev);
  58
  59         return ndev->dev.parent;
  60 }
  61
  62 int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
  63 {
  64         int err;
  65         unsigned char ll_addr[ETH_ALEN];
  66
  67         ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
  68         err = dev_mc_add(rxe->ndev, ll_addr);
  69
  70         return err;
  71 }
  72
  73 int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
  74 {
  75         int err;
  76         unsigned char ll_addr[ETH_ALEN];
  77
  78         ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
  79         err = dev_mc_del(rxe->ndev, ll_addr);
  80
  81         return err;
  82 }
  83
  84 static struct dst_entry *rxe_find_route4(struct net_device *ndev,
  85                                   struct in_addr *saddr,
  86                                   struct in_addr *daddr)
  87 {
  88         struct rtable *rt;
  89         struct flowi4 fl = { { 0 } };
  90
  91         memset(&fl, 0, sizeof(fl));
  92         fl.flowi4_oif = ndev->ifindex;
  93         memcpy(&fl.saddr, saddr, sizeof(*saddr));
  94         memcpy(&fl.daddr, daddr, sizeof(*daddr));
  95         fl.flowi4_proto = IPPROTO_UDP;
  96
  97         rt = ip_route_output_key(&init_net, &fl);
  98         if (IS_ERR(rt)) {
  99                 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
 100                 return NULL;
 101         }
 102
 103         return &rt->dst;
 104 }
 105
 106 #if IS_ENABLED(CONFIG_IPV6)
 107 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
 108                                          struct in6_addr *saddr,
 109                                          struct in6_addr *daddr)
 110 {
 111         struct dst_entry *ndst;
 112         struct flowi6 fl6 = { { 0 } };
 113
 114         memset(&fl6, 0, sizeof(fl6));
 115         fl6.flowi6_oif = ndev->ifindex;
 116         memcpy(&fl6.saddr, saddr, sizeof(*saddr));
 117         memcpy(&fl6.daddr, daddr, sizeof(*daddr));
 118         fl6.flowi6_proto = IPPROTO_UDP;
 119
 120         ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
 121                                                recv_sockets.sk6->sk, &fl6,
 122                                                NULL);
 123         if (unlikely(IS_ERR(ndst))) {
 124                 pr_err_ratelimited("no route to %pI6\n", daddr);
 125                 return NULL;
 126         }
 127
 128         if (unlikely(ndst->error)) {
 129                 pr_err("no route to %pI6\n", daddr);
 130                 goto put;
 131         }
 132
 133         return ndst;
 134 put:
 135         dst_release(ndst);
 136         return NULL;
 137 }
 138
 139 #else
 140
 141 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
 142                                          struct in6_addr *saddr,
 143                                          struct in6_addr *daddr)
 144 {
 145         return NULL;
 146 }
 147
 148 #endif
 149
 150 static struct dst_entry *rxe_find_route(struct net_device *ndev,
 151                                         struct rxe_qp *qp,
 152                                         struct rxe_av *av)
 153 {
 154         struct dst_entry *dst = NULL;
 155
 156         if (qp_type(qp) == IB_QPT_RC)
 157                 dst = sk_dst_get(qp->sk->sk);
 158
 159         if (!dst || !dst_check(dst, qp->dst_cookie)) {
 160                 if (dst)
 161                         dst_release(dst);
 162
 163                 if (av->network_type == RDMA_NETWORK_IPV4) {
 164                         struct in_addr *saddr;
 165                         struct in_addr *daddr;
 166
 167                         saddr = &av->sgid_addr._sockaddr_in.sin_addr;
 168                         daddr = &av->dgid_addr._sockaddr_in.sin_addr;
 169                         dst = rxe_find_route4(ndev, saddr, daddr);
 170                 } else if (av->network_type == RDMA_NETWORK_IPV6) {
 171                         struct in6_addr *saddr6;
 172                         struct in6_addr *daddr6;
 173
 174                         saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
 175                         daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
 176                         dst = rxe_find_route6(ndev, saddr6, daddr6);
 177 #if IS_ENABLED(CONFIG_IPV6)
 178                         if (dst)
 179                                 qp->dst_cookie =
 180                                         rt6_get_cookie((struct rt6_info *)dst);
 181 #endif
 182                 }
 183
 184                 if (dst && (qp_type(qp) == IB_QPT_RC)) {
 185                         dst_hold(dst);
 186                         sk_dst_set(qp->sk->sk, dst);
 187                 }
 188         }
 189         return dst;
 190 }
 191
 192 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 193 {
 194         struct udphdr *udph;
 195         struct net_device *ndev = skb->dev;
 196         struct net_device *rdev = ndev;
 197         struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
 198         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 199
 200         if (!rxe && is_vlan_dev(rdev)) {
 201                 rdev = vlan_dev_real_dev(ndev);
 202                 rxe = rxe_get_dev_from_net(rdev);
 203         }
 204         if (!rxe)
 205                 goto drop;
 206
 207         if (skb_linearize(skb)) {
 208                 pr_err("skb_linearize failed\n");
 209                 ib_device_put(&rxe->ib_dev);
 210                 goto drop;
 211         }
 212
 213         udph = udp_hdr(skb);
 214         pkt->rxe = rxe;
 215         pkt->port_num = 1;
 216         pkt->hdr = (u8 *)(udph + 1);
 217         pkt->mask = RXE_GRH_MASK;
 218         pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
 219
 220         rxe_rcv(skb);
 221
 222         /*
 223          * FIXME: this is in the wrong place, it needs to be done when pkt is
 224          * destroyed
 225          */
 226         ib_device_put(&rxe->ib_dev);
 227
 228         return 0;
 229 drop:
 230         kfree_skb(skb);
 231
 232         return 0;
 233 }
 234
 235 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
 236                                            bool ipv6)
 237 {
 238         int err;
 239         struct socket *sock;
 240         struct udp_port_cfg udp_cfg = { };
 241         struct udp_tunnel_sock_cfg tnl_cfg = { };
 242
 243         if (ipv6) {
 244                 udp_cfg.family = AF_INET6;
 245                 udp_cfg.ipv6_v6only = 1;
 246         } else {
 247                 udp_cfg.family = AF_INET;
 248         }
 249
 250         udp_cfg.local_udp_port = port;
 251
 252         /* Create UDP socket */
 253         err = udp_sock_create(net, &udp_cfg, &sock);
 254         if (err < 0) {
 255                 pr_err("failed to create udp socket. err = %d\n", err);
 256                 return ERR_PTR(err);
 257         }
 258
 259         tnl_cfg.encap_type = 1;
 260         tnl_cfg.encap_rcv = rxe_udp_encap_recv;
 261
 262         /* Setup UDP tunnel */
 263         setup_udp_tunnel_sock(net, sock, &tnl_cfg);
 264
 265         return sock;
 266 }
 267
 268 static void rxe_release_udp_tunnel(struct socket *sk)
 269 {
 270         if (sk)
 271                 udp_tunnel_sock_release(sk);
 272 }
 273
 274 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
 275                             __be16 dst_port)
 276 {
 277         struct udphdr *udph;
 278
 279         __skb_push(skb, sizeof(*udph));
 280         skb_reset_transport_header(skb);
 281         udph = udp_hdr(skb);
 282
 283         udph->dest = dst_port;
 284         udph->source = src_port;
 285         udph->len = htons(skb->len);
 286         udph->check = 0;
 287 }
 288
 289 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
 290                              __be32 saddr, __be32 daddr, __u8 proto,
 291                              __u8 tos, __u8 ttl, __be16 df, bool xnet)
 292 {
 293         struct iphdr *iph;
 294
 295         skb_scrub_packet(skb, xnet);
 296
 297         skb_clear_hash(skb);
 298         skb_dst_set(skb, dst_clone(dst));
 299         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 300
 301         skb_push(skb, sizeof(struct iphdr));
 302         skb_reset_network_header(skb);
 303
 304         iph = ip_hdr(skb);
 305
 306         iph->version    =       IPVERSION;
 307         iph->ihl        =       sizeof(struct iphdr) >> 2;
 308         iph->frag_off   =       df;
 309         iph->protocol   =       proto;
 310         iph->tos        =       tos;
 311         iph->daddr      =       daddr;
 312         iph->saddr      =       saddr;
 313         iph->ttl        =       ttl;
 314         __ip_select_ident(dev_net(dst->dev), iph,
 315                           skb_shinfo(skb)->gso_segs ?: 1);
 316         iph->tot_len = htons(skb->len);
 317         ip_send_check(iph);
 318 }
 319
 320 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
 321                              struct in6_addr *saddr, struct in6_addr *daddr,
 322                              __u8 proto, __u8 prio, __u8 ttl)
 323 {
 324         struct ipv6hdr *ip6h;
 325
 326         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 327         IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
 328                             | IPSKB_REROUTED);
 329         skb_dst_set(skb, dst_clone(dst));
 330
 331         __skb_push(skb, sizeof(*ip6h));
 332         skb_reset_network_header(skb);
 333         ip6h              = ipv6_hdr(skb);
 334         ip6_flow_hdr(ip6h, prio, htonl(0));
 335         ip6h->payload_len = htons(skb->len);
 336         ip6h->nexthdr     = proto;
 337         ip6h->hop_limit   = ttl;
 338         ip6h->daddr       = *daddr;
 339         ip6h->saddr       = *saddr;
 340         ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
 341 }
 342
 343 static int prepare4(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 344 {
 345         struct rxe_qp *qp = pkt->qp;
 346         struct dst_entry *dst;
 347         bool xnet = false;
 348         __be16 df = htons(IP_DF);
 349         struct rxe_av *av = rxe_get_av(pkt);
 350         struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
 351         struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
 352
 353         dst = rxe_find_route(skb->dev, qp, av);
 354         if (!dst) {
 355                 pr_err("Host not reachable\n");
 356                 return -EHOSTUNREACH;
 357         }
 358
 359         prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
 360                         cpu_to_be16(ROCE_V2_UDP_DPORT));
 361
 362         prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
 363                          av->grh.traffic_class, av->grh.hop_limit, df, xnet);
 364
 365         dst_release(dst);
 366         return 0;
 367 }
 368
 369 static int prepare6(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 370 {
 371         struct rxe_qp *qp = pkt->qp;
 372         struct dst_entry *dst;
 373         struct rxe_av *av = rxe_get_av(pkt);
 374         struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
 375         struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
 376
 377         dst = rxe_find_route(skb->dev, qp, av);
 378         if (!dst) {
 379                 pr_err("Host not reachable\n");
 380                 return -EHOSTUNREACH;
 381         }
 382
 383         prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
 384                         cpu_to_be16(ROCE_V2_UDP_DPORT));
 385
 386         prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
 387                          av->grh.traffic_class,
 388                          av->grh.hop_limit);
 389
 390         dst_release(dst);
 391         return 0;
 392 }
 393
 394 int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb, u32 *crc)
 395 {
 396         int err = 0;
 397
 398         if (skb->protocol == htons(ETH_P_IP))
 399                 err = prepare4(pkt, skb);
 400         else if (skb->protocol == htons(ETH_P_IPV6))
 401                 err = prepare6(pkt, skb);
 402
 403         *crc = rxe_icrc_hdr(pkt, skb);
 404
 405         if (ether_addr_equal(skb->dev->dev_addr, rxe_get_av(pkt)->dmac))
 406                 pkt->mask |= RXE_LOOPBACK_MASK;
 407
 408         return err;
 409 }
 410
 411 static void rxe_skb_tx_dtor(struct sk_buff *skb)
 412 {
 413         struct sock *sk = skb->sk;
 414         struct rxe_qp *qp = sk->sk_user_data;
 415         int skb_out = atomic_dec_return(&qp->skb_out);
 416
 417         if (unlikely(qp->need_req_skb &&
 418                      skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
 419                 rxe_run_task(&qp->req.task, 1);
 420
 421         rxe_drop_ref(qp);
 422 }
 423
 424 int rxe_send(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 425 {
 426         int err;
 427
 428         skb->destructor = rxe_skb_tx_dtor;
 429         skb->sk = pkt->qp->sk->sk;
 430
 431         rxe_add_ref(pkt->qp);
 432         atomic_inc(&pkt->qp->skb_out);
 433
 434         if (skb->protocol == htons(ETH_P_IP)) {
 435                 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
 436         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 437                 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
 438         } else {
 439                 pr_err("Unknown layer 3 protocol: %d\n", skb->protocol);
 440                 atomic_dec(&pkt->qp->skb_out);
 441                 rxe_drop_ref(pkt->qp);
 442                 kfree_skb(skb);
 443                 return -EINVAL;
 444         }
 445
 446         if (unlikely(net_xmit_eval(err))) {
 447                 pr_debug("error sending packet: %d\n", err);
 448                 return -EAGAIN;
 449         }
 450
 451         return 0;
 452 }
 453
 454 void rxe_loopback(struct sk_buff *skb)
 455 {
 456         rxe_rcv(skb);
 457 }
 458
 459 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
 460                                 int paylen, struct rxe_pkt_info *pkt)
 461 {
 462         unsigned int hdr_len;
 463         struct sk_buff *skb = NULL;
 464         struct net_device *ndev;
 465         const struct ib_gid_attr *attr;
 466         const int port_num = 1;
 467
 468         attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
 469         if (IS_ERR(attr))
 470                 return NULL;
 471
 472         if (av->network_type == RDMA_NETWORK_IPV4)
 473                 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
 474                         sizeof(struct iphdr);
 475         else
 476                 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
 477                         sizeof(struct ipv6hdr);
 478
 479         rcu_read_lock();
 480         ndev = rdma_read_gid_attr_ndev_rcu(attr);
 481         if (IS_ERR(ndev)) {
 482                 rcu_read_unlock();
 483                 goto out;
 484         }
 485         skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
 486                         GFP_ATOMIC);
 487
 488         if (unlikely(!skb)) {
 489                 rcu_read_unlock();
 490                 goto out;
 491         }
 492
 493         skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
 494
 495         /* FIXME: hold reference to this netdev until life of this skb. */
 496         skb->dev        = ndev;
 497         rcu_read_unlock();
 498
 499         if (av->network_type == RDMA_NETWORK_IPV4)
 500                 skb->protocol = htons(ETH_P_IP);
 501         else
 502                 skb->protocol = htons(ETH_P_IPV6);
 503
 504         pkt->rxe        = rxe;
 505         pkt->port_num   = port_num;
 506         pkt->hdr        = skb_put_zero(skb, paylen);
 507         pkt->mask       |= RXE_GRH_MASK;
 508
 509 out:
 510         rdma_put_gid_attr(attr);
 511         return skb;
 512 }
 513
 514 /*
 515  * this is required by rxe_cfg to match rxe devices in
 516  * /sys/class/infiniband up with their underlying ethernet devices
 517  */
 518 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
 519 {
 520         return rxe->ndev->name;
 521 }
 522
 523 enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num)
 524 {
 525         return IB_LINK_LAYER_ETHERNET;
 526 }
 527
 528 int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
 529 {
 530         int err;
 531         struct rxe_dev *rxe = NULL;
 532
 533         rxe = ib_alloc_device(rxe_dev, ib_dev);
 534         if (!rxe)
 535                 return -ENOMEM;
 536
 537         rxe->ndev = ndev;
 538
 539         err = rxe_add(rxe, ndev->mtu, ibdev_name);
 540         if (err) {
 541                 ib_dealloc_device(&rxe->ib_dev);
 542                 return err;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static void rxe_port_event(struct rxe_dev *rxe,
 549                            enum ib_event_type event)
 550 {
 551         struct ib_event ev;
 552
 553         ev.device = &rxe->ib_dev;
 554         ev.element.port_num = 1;
 555         ev.event = event;
 556
 557         ib_dispatch_event(&ev);
 558 }
 559
 560 /* Caller must hold net_info_lock */
 561 void rxe_port_up(struct rxe_dev *rxe)
 562 {
 563         struct rxe_port *port;
 564
 565         port = &rxe->port;
 566         port->attr.state = IB_PORT_ACTIVE;
 567
 568         rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
 569         dev_info(&rxe->ib_dev.dev, "set active\n");
 570 }
 571
 572 /* Caller must hold net_info_lock */
 573 void rxe_port_down(struct rxe_dev *rxe)
 574 {
 575         struct rxe_port *port;
 576
 577         port = &rxe->port;
 578         port->attr.state = IB_PORT_DOWN;
 579
 580         rxe_port_event(rxe, IB_EVENT_PORT_ERR);
 581         rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
 582         dev_info(&rxe->ib_dev.dev, "set down\n");
 583 }
 584
 585 void rxe_set_port_state(struct rxe_dev *rxe)
 586 {
 587         if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))
 588                 rxe_port_up(rxe);
 589         else
 590                 rxe_port_down(rxe);
 591 }
 592
 593 static int rxe_notify(struct notifier_block *not_blk,
 594                       unsigned long event,
 595                       void *arg)
 596 {
 597         struct net_device *ndev = netdev_notifier_info_to_dev(arg);
 598         struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
 599
 600         if (!rxe)
 601                 return NOTIFY_OK;
 602
 603         switch (event) {
 604         case NETDEV_UNREGISTER:
 605                 ib_unregister_device_queued(&rxe->ib_dev);
 606                 break;
 607         case NETDEV_UP:
 608                 rxe_port_up(rxe);
 609                 break;
 610         case NETDEV_DOWN:
 611                 rxe_port_down(rxe);
 612                 break;
 613         case NETDEV_CHANGEMTU:
 614                 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
 615                 rxe_set_mtu(rxe, ndev->mtu);
 616                 break;
 617         case NETDEV_CHANGE:
 618                 rxe_set_port_state(rxe);
 619                 break;
 620         case NETDEV_REBOOT:
 621         case NETDEV_GOING_DOWN:
 622         case NETDEV_CHANGEADDR:
 623         case NETDEV_CHANGENAME:
 624         case NETDEV_FEAT_CHANGE:
 625         default:
 626                 pr_info("ignoring netdev event = %ld for %s\n",
 627                         event, ndev->name);
 628                 break;
 629         }
 630
 631         ib_device_put(&rxe->ib_dev);
 632         return NOTIFY_OK;
 633 }
 634
 635 static struct notifier_block rxe_net_notifier = {
 636         .notifier_call = rxe_notify,
 637 };
 638
 639 static int rxe_net_ipv4_init(void)
 640 {
 641         recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
 642                                 htons(ROCE_V2_UDP_DPORT), false);
 643         if (IS_ERR(recv_sockets.sk4)) {
 644                 recv_sockets.sk4 = NULL;
 645                 pr_err("Failed to create IPv4 UDP tunnel\n");
 646                 return -1;
 647         }
 648
 649         return 0;
 650 }
 651
 652 static int rxe_net_ipv6_init(void)
 653 {
 654 #if IS_ENABLED(CONFIG_IPV6)
 655
 656         recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
 657                                                 htons(ROCE_V2_UDP_DPORT), true);
 658         if (IS_ERR(recv_sockets.sk6)) {
 659                 recv_sockets.sk6 = NULL;
 660                 pr_err("Failed to create IPv6 UDP tunnel\n");
 661                 return -1;
 662         }
 663 #endif
 664         return 0;
 665 }
 666
 667 void rxe_net_exit(void)
 668 {
 669         rxe_release_udp_tunnel(recv_sockets.sk6);
 670         rxe_release_udp_tunnel(recv_sockets.sk4);
 671         unregister_netdevice_notifier(&rxe_net_notifier);
 672 }
 673
 674 int rxe_net_init(void)
 675 {
 676         int err;
 677
 678         recv_sockets.sk6 = NULL;
 679
 680         err = rxe_net_ipv4_init();
 681         if (err)
 682                 return err;
 683         err = rxe_net_ipv6_init();
 684         if (err)
 685                 goto err_out;
 686         err = register_netdevice_notifier(&rxe_net_notifier);
 687         if (err) {
 688                 pr_err("Failed to register netdev notifier\n");
 689                 goto err_out;
 690         }
 691         return 0;
 692 err_out:
 693         rxe_net_exit();
 694         return err;
 695 }