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         if (qp)
 270                 rxe_drop_ref(qp);
 271 err1:
 272         return -EINVAL;
 273 }
 274
 275 static inline void rxe_rcv_pkt(struct rxe_dev *rxe,
 276                                struct rxe_pkt_info *pkt,
 277                                struct sk_buff *skb)
 278 {
 279         if (pkt->mask & RXE_REQ_MASK)
 280                 rxe_resp_queue_pkt(rxe, pkt->qp, skb);
 281         else
 282                 rxe_comp_queue_pkt(rxe, pkt->qp, skb);
 283 }
 284
 285 static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
 286 {
 287         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 288         struct rxe_mc_grp *mcg;
 289         struct sk_buff *skb_copy;
 290         struct rxe_mc_elem *mce;
 291         struct rxe_qp *qp;
 292         union ib_gid dgid;
 293         int err;
 294
 295         if (skb->protocol == htons(ETH_P_IP))
 296                 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
 297                                        (struct in6_addr *)&dgid);
 298         else if (skb->protocol == htons(ETH_P_IPV6))
 299                 memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
 300
 301         /* lookup mcast group corresponding to mgid, takes a ref */
 302         mcg = rxe_pool_get_key(&rxe->mc_grp_pool, &dgid);
 303         if (!mcg)
 304                 goto err1;      /* mcast group not registered */
 305
 306         spin_lock_bh(&mcg->mcg_lock);
 307
 308         list_for_each_entry(mce, &mcg->qp_list, qp_list) {
 309                 qp = mce->qp;
 310                 pkt = SKB_TO_PKT(skb);
 311
 312                 /* validate qp for incoming packet */
 313                 err = check_type_state(rxe, pkt, qp);
 314                 if (err)
 315                         continue;
 316
 317                 err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
 318                 if (err)
 319                         continue;
 320
 321                 /* if *not* the last qp in the list
 322                  * make a copy of the skb to post to the next qp
 323                  */
 324                 skb_copy = (mce->qp_list.next != &mcg->qp_list) ?
 325                                 skb_clone(skb, GFP_ATOMIC) : NULL;
 326
 327                 pkt->qp = qp;
 328                 rxe_add_ref(qp);
 329                 rxe_rcv_pkt(rxe, pkt, skb);
 330
 331                 skb = skb_copy;
 332                 if (!skb)
 333                         break;
 334         }
 335
 336         spin_unlock_bh(&mcg->mcg_lock);
 337
 338         rxe_drop_ref(mcg);      /* drop ref from rxe_pool_get_key. */
 339
 340 err1:
 341         if (skb)
 342                 kfree_skb(skb);
 343 }
 344
 345 static int rxe_match_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
 346 {
 347         union ib_gid dgid;
 348         union ib_gid *pdgid;
 349         u16 index;
 350
 351         if (skb->protocol == htons(ETH_P_IP)) {
 352                 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
 353                                        (struct in6_addr *)&dgid);
 354                 pdgid = &dgid;
 355         } else {
 356                 pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
 357         }
 358
 359         return ib_find_cached_gid_by_port(&rxe->ib_dev, pdgid,
 360                                           IB_GID_TYPE_ROCE_UDP_ENCAP,
 361                                           1, rxe->ndev, &index);
 362 }
 363
 364 /* rxe_rcv is called from the interface driver */
 365 int rxe_rcv(struct sk_buff *skb)
 366 {
 367         int err;
 368         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 369         struct rxe_dev *rxe = pkt->rxe;
 370         __be32 *icrcp;
 371         u32 calc_icrc, pack_icrc;
 372
 373         pkt->offset = 0;
 374
 375         if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
 376                 goto drop;
 377
 378         if (unlikely(rxe_match_dgid(rxe, skb) < 0)) {
 379                 pr_warn_ratelimited("failed matching dgid\n");
 380                 goto drop;
 381         }
 382
 383         pkt->opcode = bth_opcode(pkt);
 384         pkt->psn = bth_psn(pkt);
 385         pkt->qp = NULL;
 386         pkt->mask |= rxe_opcode[pkt->opcode].mask;
 387
 388         if (unlikely(skb->len < header_size(pkt)))
 389                 goto drop;
 390
 391         err = hdr_check(pkt);
 392         if (unlikely(err))
 393                 goto drop;
 394
 395         /* Verify ICRC */
 396         icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
 397         pack_icrc = be32_to_cpu(*icrcp);
 398
 399         calc_icrc = rxe_icrc_hdr(pkt, skb);
 400         calc_icrc = crc32_le(calc_icrc, (u8 *)payload_addr(pkt),
 401                              payload_size(pkt));
 402         calc_icrc = cpu_to_be32(~calc_icrc);
 403         if (unlikely(calc_icrc != pack_icrc)) {
 404                 char saddr[sizeof(struct in6_addr)];
 405
 406                 if (skb->protocol == htons(ETH_P_IPV6))
 407                         sprintf(saddr, "%pI6", &ipv6_hdr(skb)->saddr);
 408                 else if (skb->protocol == htons(ETH_P_IP))
 409                         sprintf(saddr, "%pI4", &ip_hdr(skb)->saddr);
 410                 else
 411                         sprintf(saddr, "unknown");
 412
 413                 pr_warn_ratelimited("bad ICRC from %s\n", saddr);
 414                 goto drop;
 415         }
 416
 417         if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
 418                 rxe_rcv_mcast_pkt(rxe, skb);
 419         else
 420                 rxe_rcv_pkt(rxe, pkt, skb);
 421
 422         return 0;
 423
 424 drop:
 425         if (pkt->qp)
 426                 rxe_drop_ref(pkt->qp);
 427
 428         kfree_skb(skb);
 429         return 0;
 430 }
 431 EXPORT_SYMBOL(rxe_rcv);