drivers/infiniband/sw/rxe/rxe_net.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   4  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   5  */
   6
   7 #include <linux/skbuff.h>
   8 #include <linux/if_arp.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/if.h>
  11 #include <net/udp_tunnel.h>
  12 #include <net/sch_generic.h>
  13 #include <linux/netfilter.h>
  14 #include <rdma/ib_addr.h>
  15
  16 #include "rxe.h"
  17 #include "rxe_net.h"
  18 #include "rxe_loc.h"
  19
  20 static struct rxe_recv_sockets recv_sockets;
  21
  22 int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
  23 {
  24         int err;
  25         unsigned char ll_addr[ETH_ALEN];
  26
  27         ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
  28         err = dev_mc_add(rxe->ndev, ll_addr);
  29
  30         return err;
  31 }
  32
  33 int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
  34 {
  35         int err;
  36         unsigned char ll_addr[ETH_ALEN];
  37
  38         ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
  39         err = dev_mc_del(rxe->ndev, ll_addr);
  40
  41         return err;
  42 }
  43
  44 static struct dst_entry *rxe_find_route4(struct net_device *ndev,
  45                                   struct in_addr *saddr,
  46                                   struct in_addr *daddr)
  47 {
  48         struct rtable *rt;
  49         struct flowi4 fl = { { 0 } };
  50
  51         memset(&fl, 0, sizeof(fl));
  52         fl.flowi4_oif = ndev->ifindex;
  53         memcpy(&fl.saddr, saddr, sizeof(*saddr));
  54         memcpy(&fl.daddr, daddr, sizeof(*daddr));
  55         fl.flowi4_proto = IPPROTO_UDP;
  56
  57         rt = ip_route_output_key(&init_net, &fl);
  58         if (IS_ERR(rt)) {
  59                 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr);
  60                 return NULL;
  61         }
  62
  63         return &rt->dst;
  64 }
  65
  66 #if IS_ENABLED(CONFIG_IPV6)
  67 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
  68                                          struct in6_addr *saddr,
  69                                          struct in6_addr *daddr)
  70 {
  71         struct dst_entry *ndst;
  72         struct flowi6 fl6 = { { 0 } };
  73
  74         memset(&fl6, 0, sizeof(fl6));
  75         fl6.flowi6_oif = ndev->ifindex;
  76         memcpy(&fl6.saddr, saddr, sizeof(*saddr));
  77         memcpy(&fl6.daddr, daddr, sizeof(*daddr));
  78         fl6.flowi6_proto = IPPROTO_UDP;
  79
  80         ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk),
  81                                                recv_sockets.sk6->sk, &fl6,
  82                                                NULL);
  83         if (IS_ERR(ndst)) {
  84                 pr_err_ratelimited("no route to %pI6\n", daddr);
  85                 return NULL;
  86         }
  87
  88         if (unlikely(ndst->error)) {
  89                 pr_err("no route to %pI6\n", daddr);
  90                 goto put;
  91         }
  92
  93         return ndst;
  94 put:
  95         dst_release(ndst);
  96         return NULL;
  97 }
  98
  99 #else
 100
 101 static struct dst_entry *rxe_find_route6(struct net_device *ndev,
 102                                          struct in6_addr *saddr,
 103                                          struct in6_addr *daddr)
 104 {
 105         return NULL;
 106 }
 107
 108 #endif
 109
 110 static struct dst_entry *rxe_find_route(struct net_device *ndev,
 111                                         struct rxe_qp *qp,
 112                                         struct rxe_av *av)
 113 {
 114         struct dst_entry *dst = NULL;
 115
 116         if (qp_type(qp) == IB_QPT_RC)
 117                 dst = sk_dst_get(qp->sk->sk);
 118
 119         if (!dst || !dst_check(dst, qp->dst_cookie)) {
 120                 if (dst)
 121                         dst_release(dst);
 122
 123                 if (av->network_type == RXE_NETWORK_TYPE_IPV4) {
 124                         struct in_addr *saddr;
 125                         struct in_addr *daddr;
 126
 127                         saddr = &av->sgid_addr._sockaddr_in.sin_addr;
 128                         daddr = &av->dgid_addr._sockaddr_in.sin_addr;
 129                         dst = rxe_find_route4(ndev, saddr, daddr);
 130                 } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) {
 131                         struct in6_addr *saddr6;
 132                         struct in6_addr *daddr6;
 133
 134                         saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr;
 135                         daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr;
 136                         dst = rxe_find_route6(ndev, saddr6, daddr6);
 137 #if IS_ENABLED(CONFIG_IPV6)
 138                         if (dst)
 139                                 qp->dst_cookie =
 140                                         rt6_get_cookie((struct rt6_info *)dst);
 141 #endif
 142                 }
 143
 144                 if (dst && (qp_type(qp) == IB_QPT_RC)) {
 145                         dst_hold(dst);
 146                         sk_dst_set(qp->sk->sk, dst);
 147                 }
 148         }
 149         return dst;
 150 }
 151
 152 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 153 {
 154         struct udphdr *udph;
 155         struct net_device *ndev = skb->dev;
 156         struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
 157         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 158
 159         if (!rxe)
 160                 goto drop;
 161
 162         if (skb_linearize(skb)) {
 163                 pr_err("skb_linearize failed\n");
 164                 ib_device_put(&rxe->ib_dev);
 165                 goto drop;
 166         }
 167
 168         udph = udp_hdr(skb);
 169         pkt->rxe = rxe;
 170         pkt->port_num = 1;
 171         pkt->hdr = (u8 *)(udph + 1);
 172         pkt->mask = RXE_GRH_MASK;
 173         pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph);
 174
 175         rxe_rcv(skb);
 176
 177         /*
 178          * FIXME: this is in the wrong place, it needs to be done when pkt is
 179          * destroyed
 180          */
 181         ib_device_put(&rxe->ib_dev);
 182
 183         return 0;
 184 drop:
 185         kfree_skb(skb);
 186
 187         return 0;
 188 }
 189
 190 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
 191                                            bool ipv6)
 192 {
 193         int err;
 194         struct socket *sock;
 195         struct udp_port_cfg udp_cfg = { };
 196         struct udp_tunnel_sock_cfg tnl_cfg = { };
 197
 198         if (ipv6) {
 199                 udp_cfg.family = AF_INET6;
 200                 udp_cfg.ipv6_v6only = 1;
 201         } else {
 202                 udp_cfg.family = AF_INET;
 203         }
 204
 205         udp_cfg.local_udp_port = port;
 206
 207         /* Create UDP socket */
 208         err = udp_sock_create(net, &udp_cfg, &sock);
 209         if (err < 0) {
 210                 pr_err("failed to create udp socket. err = %d\n", err);
 211                 return ERR_PTR(err);
 212         }
 213
 214         tnl_cfg.encap_type = 1;
 215         tnl_cfg.encap_rcv = rxe_udp_encap_recv;
 216
 217         /* Setup UDP tunnel */
 218         setup_udp_tunnel_sock(net, sock, &tnl_cfg);
 219
 220         return sock;
 221 }
 222
 223 static void rxe_release_udp_tunnel(struct socket *sk)
 224 {
 225         if (sk)
 226                 udp_tunnel_sock_release(sk);
 227 }
 228
 229 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port,
 230                             __be16 dst_port)
 231 {
 232         struct udphdr *udph;
 233
 234         __skb_push(skb, sizeof(*udph));
 235         skb_reset_transport_header(skb);
 236         udph = udp_hdr(skb);
 237
 238         udph->dest = dst_port;
 239         udph->source = src_port;
 240         udph->len = htons(skb->len);
 241         udph->check = 0;
 242 }
 243
 244 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb,
 245                              __be32 saddr, __be32 daddr, __u8 proto,
 246                              __u8 tos, __u8 ttl, __be16 df, bool xnet)
 247 {
 248         struct iphdr *iph;
 249
 250         skb_scrub_packet(skb, xnet);
 251
 252         skb_clear_hash(skb);
 253         skb_dst_set(skb, dst_clone(dst));
 254         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 255
 256         skb_push(skb, sizeof(struct iphdr));
 257         skb_reset_network_header(skb);
 258
 259         iph = ip_hdr(skb);
 260
 261         iph->version    =       IPVERSION;
 262         iph->ihl        =       sizeof(struct iphdr) >> 2;
 263         iph->frag_off   =       df;
 264         iph->protocol   =       proto;
 265         iph->tos        =       tos;
 266         iph->daddr      =       daddr;
 267         iph->saddr      =       saddr;
 268         iph->ttl        =       ttl;
 269         __ip_select_ident(dev_net(dst->dev), iph,
 270                           skb_shinfo(skb)->gso_segs ?: 1);
 271         iph->tot_len = htons(skb->len);
 272         ip_send_check(iph);
 273 }
 274
 275 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb,
 276                              struct in6_addr *saddr, struct in6_addr *daddr,
 277                              __u8 proto, __u8 prio, __u8 ttl)
 278 {
 279         struct ipv6hdr *ip6h;
 280
 281         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 282         IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
 283                             | IPSKB_REROUTED);
 284         skb_dst_set(skb, dst_clone(dst));
 285
 286         __skb_push(skb, sizeof(*ip6h));
 287         skb_reset_network_header(skb);
 288         ip6h              = ipv6_hdr(skb);
 289         ip6_flow_hdr(ip6h, prio, htonl(0));
 290         ip6h->payload_len = htons(skb->len);
 291         ip6h->nexthdr     = proto;
 292         ip6h->hop_limit   = ttl;
 293         ip6h->daddr       = *daddr;
 294         ip6h->saddr       = *saddr;
 295         ip6h->payload_len = htons(skb->len - sizeof(*ip6h));
 296 }
 297
 298 static int prepare4(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 299 {
 300         struct rxe_qp *qp = pkt->qp;
 301         struct dst_entry *dst;
 302         bool xnet = false;
 303         __be16 df = htons(IP_DF);
 304         struct rxe_av *av = rxe_get_av(pkt);
 305         struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr;
 306         struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr;
 307
 308         dst = rxe_find_route(skb->dev, qp, av);
 309         if (!dst) {
 310                 pr_err("Host not reachable\n");
 311                 return -EHOSTUNREACH;
 312         }
 313
 314         prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
 315                         cpu_to_be16(ROCE_V2_UDP_DPORT));
 316
 317         prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP,
 318                          av->grh.traffic_class, av->grh.hop_limit, df, xnet);
 319
 320         dst_release(dst);
 321         return 0;
 322 }
 323
 324 static int prepare6(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 325 {
 326         struct rxe_qp *qp = pkt->qp;
 327         struct dst_entry *dst;
 328         struct rxe_av *av = rxe_get_av(pkt);
 329         struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr;
 330         struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr;
 331
 332         dst = rxe_find_route(skb->dev, qp, av);
 333         if (!dst) {
 334                 pr_err("Host not reachable\n");
 335                 return -EHOSTUNREACH;
 336         }
 337
 338         prepare_udp_hdr(skb, cpu_to_be16(qp->src_port),
 339                         cpu_to_be16(ROCE_V2_UDP_DPORT));
 340
 341         prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP,
 342                          av->grh.traffic_class,
 343                          av->grh.hop_limit);
 344
 345         dst_release(dst);
 346         return 0;
 347 }
 348
 349 int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb, u32 *crc)
 350 {
 351         int err = 0;
 352
 353         if (skb->protocol == htons(ETH_P_IP))
 354                 err = prepare4(pkt, skb);
 355         else if (skb->protocol == htons(ETH_P_IPV6))
 356                 err = prepare6(pkt, skb);
 357
 358         *crc = rxe_icrc_hdr(pkt, skb);
 359
 360         if (ether_addr_equal(skb->dev->dev_addr, rxe_get_av(pkt)->dmac))
 361                 pkt->mask |= RXE_LOOPBACK_MASK;
 362
 363         return err;
 364 }
 365
 366 static void rxe_skb_tx_dtor(struct sk_buff *skb)
 367 {
 368         struct sock *sk = skb->sk;
 369         struct rxe_qp *qp = sk->sk_user_data;
 370         int skb_out = atomic_dec_return(&qp->skb_out);
 371
 372         if (unlikely(qp->need_req_skb &&
 373                      skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW))
 374                 rxe_run_task(&qp->req.task, 1);
 375
 376         rxe_drop_ref(qp);
 377 }
 378
 379 int rxe_send(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 380 {
 381         int err;
 382
 383         skb->destructor = rxe_skb_tx_dtor;
 384         skb->sk = pkt->qp->sk->sk;
 385
 386         rxe_add_ref(pkt->qp);
 387         atomic_inc(&pkt->qp->skb_out);
 388
 389         if (skb->protocol == htons(ETH_P_IP)) {
 390                 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
 391         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 392                 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
 393         } else {
 394                 pr_err("Unknown layer 3 protocol: %d\n", skb->protocol);
 395                 atomic_dec(&pkt->qp->skb_out);
 396                 rxe_drop_ref(pkt->qp);
 397                 kfree_skb(skb);
 398                 return -EINVAL;
 399         }
 400
 401         if (unlikely(net_xmit_eval(err))) {
 402                 pr_debug("error sending packet: %d\n", err);
 403                 return -EAGAIN;
 404         }
 405
 406         return 0;
 407 }
 408
 409 void rxe_loopback(struct sk_buff *skb)
 410 {
 411         rxe_rcv(skb);
 412 }
 413
 414 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
 415                                 int paylen, struct rxe_pkt_info *pkt)
 416 {
 417         unsigned int hdr_len;
 418         struct sk_buff *skb = NULL;
 419         struct net_device *ndev;
 420         const struct ib_gid_attr *attr;
 421         const int port_num = 1;
 422
 423         attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index);
 424         if (IS_ERR(attr))
 425                 return NULL;
 426
 427         if (av->network_type == RXE_NETWORK_TYPE_IPV4)
 428                 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
 429                         sizeof(struct iphdr);
 430         else
 431                 hdr_len = ETH_HLEN + sizeof(struct udphdr) +
 432                         sizeof(struct ipv6hdr);
 433
 434         rcu_read_lock();
 435         ndev = rdma_read_gid_attr_ndev_rcu(attr);
 436         if (IS_ERR(ndev)) {
 437                 rcu_read_unlock();
 438                 goto out;
 439         }
 440         skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev),
 441                         GFP_ATOMIC);
 442
 443         if (unlikely(!skb)) {
 444                 rcu_read_unlock();
 445                 goto out;
 446         }
 447
 448         skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
 449
 450         /* FIXME: hold reference to this netdev until life of this skb. */
 451         skb->dev        = ndev;
 452         rcu_read_unlock();
 453
 454         if (av->network_type == RXE_NETWORK_TYPE_IPV4)
 455                 skb->protocol = htons(ETH_P_IP);
 456         else
 457                 skb->protocol = htons(ETH_P_IPV6);
 458
 459         pkt->rxe        = rxe;
 460         pkt->port_num   = port_num;
 461         pkt->hdr        = skb_put_zero(skb, paylen);
 462         pkt->mask       |= RXE_GRH_MASK;
 463
 464 out:
 465         rdma_put_gid_attr(attr);
 466         return skb;
 467 }
 468
 469 /*
 470  * this is required by rxe_cfg to match rxe devices in
 471  * /sys/class/infiniband up with their underlying ethernet devices
 472  */
 473 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
 474 {
 475         return rxe->ndev->name;
 476 }
 477
 478 int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
 479 {
 480         int err;
 481         struct rxe_dev *rxe = NULL;
 482
 483         rxe = ib_alloc_device(rxe_dev, ib_dev);
 484         if (!rxe)
 485                 return -ENOMEM;
 486
 487         rxe->ndev = ndev;
 488
 489         err = rxe_add(rxe, ndev->mtu, ibdev_name);
 490         if (err) {
 491                 ib_dealloc_device(&rxe->ib_dev);
 492                 return err;
 493         }
 494
 495         return 0;
 496 }
 497
 498 static void rxe_port_event(struct rxe_dev *rxe,
 499                            enum ib_event_type event)
 500 {
 501         struct ib_event ev;
 502
 503         ev.device = &rxe->ib_dev;
 504         ev.element.port_num = 1;
 505         ev.event = event;
 506
 507         ib_dispatch_event(&ev);
 508 }
 509
 510 /* Caller must hold net_info_lock */
 511 void rxe_port_up(struct rxe_dev *rxe)
 512 {
 513         struct rxe_port *port;
 514
 515         port = &rxe->port;
 516         port->attr.state = IB_PORT_ACTIVE;
 517
 518         rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
 519         dev_info(&rxe->ib_dev.dev, "set active\n");
 520 }
 521
 522 /* Caller must hold net_info_lock */
 523 void rxe_port_down(struct rxe_dev *rxe)
 524 {
 525         struct rxe_port *port;
 526
 527         port = &rxe->port;
 528         port->attr.state = IB_PORT_DOWN;
 529
 530         rxe_port_event(rxe, IB_EVENT_PORT_ERR);
 531         rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
 532         dev_info(&rxe->ib_dev.dev, "set down\n");
 533 }
 534
 535 void rxe_set_port_state(struct rxe_dev *rxe)
 536 {
 537         if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))
 538                 rxe_port_up(rxe);
 539         else
 540                 rxe_port_down(rxe);
 541 }
 542
 543 static int rxe_notify(struct notifier_block *not_blk,
 544                       unsigned long event,
 545                       void *arg)
 546 {
 547         struct net_device *ndev = netdev_notifier_info_to_dev(arg);
 548         struct rxe_dev *rxe = rxe_get_dev_from_net(ndev);
 549
 550         if (!rxe)
 551                 return NOTIFY_OK;
 552
 553         switch (event) {
 554         case NETDEV_UNREGISTER:
 555                 ib_unregister_device_queued(&rxe->ib_dev);
 556                 break;
 557         case NETDEV_UP:
 558                 rxe_port_up(rxe);
 559                 break;
 560         case NETDEV_DOWN:
 561                 rxe_port_down(rxe);
 562                 break;
 563         case NETDEV_CHANGEMTU:
 564                 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu);
 565                 rxe_set_mtu(rxe, ndev->mtu);
 566                 break;
 567         case NETDEV_CHANGE:
 568                 rxe_set_port_state(rxe);
 569                 break;
 570         case NETDEV_REBOOT:
 571         case NETDEV_GOING_DOWN:
 572         case NETDEV_CHANGEADDR:
 573         case NETDEV_CHANGENAME:
 574         case NETDEV_FEAT_CHANGE:
 575         default:
 576                 pr_info("ignoring netdev event = %ld for %s\n",
 577                         event, ndev->name);
 578                 break;
 579         }
 580
 581         ib_device_put(&rxe->ib_dev);
 582         return NOTIFY_OK;
 583 }
 584
 585 static struct notifier_block rxe_net_notifier = {
 586         .notifier_call = rxe_notify,
 587 };
 588
 589 static int rxe_net_ipv4_init(void)
 590 {
 591         recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
 592                                 htons(ROCE_V2_UDP_DPORT), false);
 593         if (IS_ERR(recv_sockets.sk4)) {
 594                 recv_sockets.sk4 = NULL;
 595                 pr_err("Failed to create IPv4 UDP tunnel\n");
 596                 return -1;
 597         }
 598
 599         return 0;
 600 }
 601
 602 static int rxe_net_ipv6_init(void)
 603 {
 604 #if IS_ENABLED(CONFIG_IPV6)
 605
 606         recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
 607                                                 htons(ROCE_V2_UDP_DPORT), true);
 608         if (IS_ERR(recv_sockets.sk6)) {
 609                 recv_sockets.sk6 = NULL;
 610                 pr_err("Failed to create IPv6 UDP tunnel\n");
 611                 return -1;
 612         }
 613 #endif
 614         return 0;
 615 }
 616
 617 void rxe_net_exit(void)
 618 {
 619         rxe_release_udp_tunnel(recv_sockets.sk6);
 620         rxe_release_udp_tunnel(recv_sockets.sk4);
 621         unregister_netdevice_notifier(&rxe_net_notifier);
 622 }
 623
 624 int rxe_net_init(void)
 625 {
 626         int err;
 627
 628         recv_sockets.sk6 = NULL;
 629
 630         err = rxe_net_ipv4_init();
 631         if (err)
 632                 return err;
 633         err = rxe_net_ipv6_init();
 634         if (err)
 635                 goto err_out;
 636         err = register_netdevice_notifier(&rxe_net_notifier);
 637         if (err) {
 638                 pr_err("Failed to register netdev notifier\n");
 639                 goto err_out;
 640         }
 641         return 0;
 642 err_out:
 643         rxe_net_exit();
 644         return err;
 645 }