drivers/infiniband/sw/rxe/rxe_recv.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
  36 #include "rxe.h"
  37 #include "rxe_loc.h"
  38
  39 /* check that QP matches packet opcode type and is in a valid state */
  40 static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
  41                             struct rxe_qp *qp)
  42 {
  43         unsigned int pkt_type;
  44
  45         if (unlikely(!qp->valid))
  46                 goto err1;
  47
  48         pkt_type = pkt->opcode & 0xe0;
  49
  50         switch (qp_type(qp)) {
  51         case IB_QPT_RC:
  52                 if (unlikely(pkt_type != IB_OPCODE_RC)) {
  53                         pr_warn_ratelimited("bad qp type\n");
  54                         goto err1;
  55                 }
  56                 break;
  57         case IB_QPT_UC:
  58                 if (unlikely(pkt_type != IB_OPCODE_UC)) {
  59                         pr_warn_ratelimited("bad qp type\n");
  60                         goto err1;
  61                 }
  62                 break;
  63         case IB_QPT_UD:
  64         case IB_QPT_SMI:
  65         case IB_QPT_GSI:
  66                 if (unlikely(pkt_type != IB_OPCODE_UD)) {
  67                         pr_warn_ratelimited("bad qp type\n");
  68                         goto err1;
  69                 }
  70                 break;
  71         default:
  72                 pr_warn_ratelimited("unsupported qp type\n");
  73                 goto err1;
  74         }
  75
  76         if (pkt->mask & RXE_REQ_MASK) {
  77                 if (unlikely(qp->resp.state != QP_STATE_READY))
  78                         goto err1;
  79         } else if (unlikely(qp->req.state < QP_STATE_READY ||
  80                                 qp->req.state > QP_STATE_DRAINED)) {
  81                 goto err1;
  82         }
  83
  84         return 0;
  85
  86 err1:
  87         return -EINVAL;
  88 }
  89
  90 static void set_bad_pkey_cntr(struct rxe_port *port)
  91 {
  92         spin_lock_bh(&port->port_lock);
  93         port->attr.bad_pkey_cntr = min((u32)0xffff,
  94                                        port->attr.bad_pkey_cntr + 1);
  95         spin_unlock_bh(&port->port_lock);
  96 }
  97
  98 static void set_qkey_viol_cntr(struct rxe_port *port)
  99 {
 100         spin_lock_bh(&port->port_lock);
 101         port->attr.qkey_viol_cntr = min((u32)0xffff,
 102                                         port->attr.qkey_viol_cntr + 1);
 103         spin_unlock_bh(&port->port_lock);
 104 }
 105
 106 static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 107                       u32 qpn, struct rxe_qp *qp)
 108 {
 109         int i;
 110         int found_pkey = 0;
 111         struct rxe_port *port = &rxe->port;
 112         u16 pkey = bth_pkey(pkt);
 113
 114         pkt->pkey_index = 0;
 115
 116         if (qpn == 1) {
 117                 for (i = 0; i < port->attr.pkey_tbl_len; i++) {
 118                         if (pkey_match(pkey, port->pkey_tbl[i])) {
 119                                 pkt->pkey_index = i;
 120                                 found_pkey = 1;
 121                                 break;
 122                         }
 123                 }
 124
 125                 if (!found_pkey) {
 126                         pr_warn_ratelimited("bad pkey = 0x%x\n", pkey);
 127                         set_bad_pkey_cntr(port);
 128                         goto err1;
 129                 }
 130         } else if (qpn != 0) {
 131                 if (unlikely(!pkey_match(pkey,
 132                                          port->pkey_tbl[qp->attr.pkey_index]
 133                                         ))) {
 134                         pr_warn_ratelimited("bad pkey = 0x%0x\n", pkey);
 135                         set_bad_pkey_cntr(port);
 136                         goto err1;
 137                 }
 138                 pkt->pkey_index = qp->attr.pkey_index;
 139         }
 140
 141         if ((qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) &&
 142             qpn != 0 && pkt->mask) {
 143                 u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
 144
 145                 if (unlikely(deth_qkey(pkt) != qkey)) {
 146                         pr_warn_ratelimited("bad qkey, got 0x%x expected 0x%x for qpn 0x%x\n",
 147                                             deth_qkey(pkt), qkey, qpn);
 148                         set_qkey_viol_cntr(port);
 149                         goto err1;
 150                 }
 151         }
 152
 153         return 0;
 154
 155 err1:
 156         return -EINVAL;
 157 }
 158
 159 static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 160                       struct rxe_qp *qp)
 161 {
 162         struct sk_buff *skb = PKT_TO_SKB(pkt);
 163
 164         if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
 165                 goto done;
 166
 167         if (unlikely(pkt->port_num != qp->attr.port_num)) {
 168                 pr_warn_ratelimited("port %d != qp port %d\n",
 169                                     pkt->port_num, qp->attr.port_num);
 170                 goto err1;
 171         }
 172
 173         if (skb->protocol == htons(ETH_P_IP)) {
 174                 struct in_addr *saddr =
 175                         &qp->pri_av.sgid_addr._sockaddr_in.sin_addr;
 176                 struct in_addr *daddr =
 177                         &qp->pri_av.dgid_addr._sockaddr_in.sin_addr;
 178
 179                 if (ip_hdr(skb)->daddr != saddr->s_addr) {
 180                         pr_warn_ratelimited("dst addr %pI4 != qp source addr %pI4\n",
 181                                             &ip_hdr(skb)->daddr,
 182                                             &saddr->s_addr);
 183                         goto err1;
 184                 }
 185
 186                 if (ip_hdr(skb)->saddr != daddr->s_addr) {
 187                         pr_warn_ratelimited("source addr %pI4 != qp dst addr %pI4\n",
 188                                             &ip_hdr(skb)->saddr,
 189                                             &daddr->s_addr);
 190                         goto err1;
 191                 }
 192
 193         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 194                 struct in6_addr *saddr =
 195                         &qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;
 196                 struct in6_addr *daddr =
 197                         &qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;
 198
 199                 if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr))) {
 200                         pr_warn_ratelimited("dst addr %pI6 != qp source addr %pI6\n",
 201                                             &ipv6_hdr(skb)->daddr, saddr);
 202                         goto err1;
 203                 }
 204
 205                 if (memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr))) {
 206                         pr_warn_ratelimited("source addr %pI6 != qp dst addr %pI6\n",
 207                                             &ipv6_hdr(skb)->saddr, daddr);
 208                         goto err1;
 209                 }
 210         }
 211
 212 done:
 213         return 0;
 214
 215 err1:
 216         return -EINVAL;
 217 }
 218
 219 static int hdr_check(struct rxe_pkt_info *pkt)
 220 {
 221         struct rxe_dev *rxe = pkt->rxe;
 222         struct rxe_port *port = &rxe->port;
 223         struct rxe_qp *qp = NULL;
 224         u32 qpn = bth_qpn(pkt);
 225         int index;
 226         int err;
 227
 228         if (unlikely(bth_tver(pkt) != BTH_TVER)) {
 229                 pr_warn_ratelimited("bad tver\n");
 230                 goto err1;
 231         }
 232
 233         if (unlikely(qpn == 0)) {
 234                 pr_warn_once("QP 0 not supported");
 235                 goto err1;
 236         }
 237
 238         if (qpn != IB_MULTICAST_QPN) {
 239                 index = (qpn == 1) ? port->qp_gsi_index : qpn;
 240
 241                 qp = rxe_pool_get_index(&rxe->qp_pool, index);
 242                 if (unlikely(!qp)) {
 243                         pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
 244                         goto err1;
 245                 }
 246
 247                 err = check_type_state(rxe, pkt, qp);
 248                 if (unlikely(err))
 249                         goto err2;
 250
 251                 err = check_addr(rxe, pkt, qp);
 252                 if (unlikely(err))
 253                         goto err2;
 254
 255                 err = check_keys(rxe, pkt, qpn, qp);
 256                 if (unlikely(err))
 257                         goto err2;
 258         } else {
 259                 if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
 260                         pr_warn_ratelimited("no grh for mcast qpn\n");
 261                         goto err1;
 262                 }
 263         }
 264
 265         pkt->qp = qp;
 266         return 0;
 267
 268 err2:
 269         rxe_drop_ref(qp);
 270 err1:
 271         return -EINVAL;
 272 }
 273
 274 static inline void rxe_rcv_pkt(struct rxe_dev *rxe,
 275                                struct rxe_pkt_info *pkt,
 276                                struct sk_buff *skb)
 277 {
 278         if (pkt->mask & RXE_REQ_MASK)
 279                 rxe_resp_queue_pkt(rxe, pkt->qp, skb);
 280         else
 281                 rxe_comp_queue_pkt(rxe, pkt->qp, skb);
 282 }
 283
 284 static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
 285 {
 286         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 287         struct rxe_mc_grp *mcg;
 288         struct rxe_mc_elem *mce;
 289         struct rxe_qp *qp;
 290         union ib_gid dgid;
 291         int err;
 292
 293         if (skb->protocol == htons(ETH_P_IP))
 294                 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
 295                                        (struct in6_addr *)&dgid);
 296         else if (skb->protocol == htons(ETH_P_IPV6))
 297                 memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
 298
 299         /* lookup mcast group corresponding to mgid, takes a ref */
 300         mcg = rxe_pool_get_key(&rxe->mc_grp_pool, &dgid);
 301         if (!mcg)
 302                 goto err1;      /* mcast group not registered */
 303
 304         spin_lock_bh(&mcg->mcg_lock);
 305
 306         list_for_each_entry(mce, &mcg->qp_list, qp_list) {
 307                 qp = mce->qp;
 308                 pkt = SKB_TO_PKT(skb);
 309
 310                 /* validate qp for incoming packet */
 311                 err = check_type_state(rxe, pkt, qp);
 312                 if (err)
 313                         continue;
 314
 315                 err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
 316                 if (err)
 317                         continue;
 318
 319                 /* if *not* the last qp in the list
 320                  * increase the users of the skb then post to the next qp
 321                  */
 322                 if (mce->qp_list.next != &mcg->qp_list)
 323                         skb_get(skb);
 324
 325                 pkt->qp = qp;
 326                 rxe_add_ref(qp);
 327                 rxe_rcv_pkt(rxe, pkt, skb);
 328         }
 329
 330         spin_unlock_bh(&mcg->mcg_lock);
 331
 332         rxe_drop_ref(mcg);      /* drop ref from rxe_pool_get_key. */
 333
 334 err1:
 335         kfree_skb(skb);
 336 }
 337
 338 static int rxe_match_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
 339 {
 340         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 341         const struct ib_gid_attr *gid_attr;
 342         union ib_gid dgid;
 343         union ib_gid *pdgid;
 344
 345         if (pkt->mask & RXE_LOOPBACK_MASK)
 346                 return 0;
 347
 348         if (skb->protocol == htons(ETH_P_IP)) {
 349                 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
 350                                        (struct in6_addr *)&dgid);
 351                 pdgid = &dgid;
 352         } else {
 353                 pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
 354         }
 355
 356         gid_attr = rdma_find_gid_by_port(&rxe->ib_dev, pdgid,
 357                                          IB_GID_TYPE_ROCE_UDP_ENCAP,
 358                                          1, skb->dev);
 359         if (IS_ERR(gid_attr))
 360                 return PTR_ERR(gid_attr);
 361
 362         rdma_put_gid_attr(gid_attr);
 363         return 0;
 364 }
 365
 366 /* rxe_rcv is called from the interface driver */
 367 void rxe_rcv(struct sk_buff *skb)
 368 {
 369         int err;
 370         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 371         struct rxe_dev *rxe = pkt->rxe;
 372         __be32 *icrcp;
 373         u32 calc_icrc, pack_icrc;
 374
 375         pkt->offset = 0;
 376
 377         if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
 378                 goto drop;
 379
 380         if (rxe_match_dgid(rxe, skb) < 0) {
 381                 pr_warn_ratelimited("failed matching dgid\n");
 382                 goto drop;
 383         }
 384
 385         pkt->opcode = bth_opcode(pkt);
 386         pkt->psn = bth_psn(pkt);
 387         pkt->qp = NULL;
 388         pkt->mask |= rxe_opcode[pkt->opcode].mask;
 389
 390         if (unlikely(skb->len < header_size(pkt)))
 391                 goto drop;
 392
 393         err = hdr_check(pkt);
 394         if (unlikely(err))
 395                 goto drop;
 396
 397         /* Verify ICRC */
 398         icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
 399         pack_icrc = be32_to_cpu(*icrcp);
 400
 401         calc_icrc = rxe_icrc_hdr(pkt, skb);
 402         calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
 403                               payload_size(pkt) + bth_pad(pkt));
 404         calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
 405         if (unlikely(calc_icrc != pack_icrc)) {
 406                 if (skb->protocol == htons(ETH_P_IPV6))
 407                         pr_warn_ratelimited("bad ICRC from %pI6c\n",
 408                                             &ipv6_hdr(skb)->saddr);
 409                 else if (skb->protocol == htons(ETH_P_IP))
 410                         pr_warn_ratelimited("bad ICRC from %pI4\n",
 411                                             &ip_hdr(skb)->saddr);
 412                 else
 413                         pr_warn_ratelimited("bad ICRC from unknown\n");
 414
 415                 goto drop;
 416         }
 417
 418         rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
 419
 420         if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
 421                 rxe_rcv_mcast_pkt(rxe, skb);
 422         else
 423                 rxe_rcv_pkt(rxe, pkt, skb);
 424
 425         return;
 426
 427 drop:
 428         if (pkt->qp)
 429                 rxe_drop_ref(pkt->qp);
 430
 431         kfree_skb(skb);
 432 }