drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c

   1 /* Broadcom NetXtreme-C/E network driver.
   2  *
   3  * Copyright (c) 2017 Broadcom Limited
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation.
   8  */
   9
  10 #include <linux/netdevice.h>
  11 #include <linux/inetdevice.h>
  12 #include <linux/if_vlan.h>
  13 #include <net/flow_dissector.h>
  14 #include <net/pkt_cls.h>
  15 #include <net/tc_act/tc_gact.h>
  16 #include <net/tc_act/tc_skbedit.h>
  17 #include <net/tc_act/tc_mirred.h>
  18 #include <net/tc_act/tc_vlan.h>
  19 #include <net/tc_act/tc_pedit.h>
  20 #include <net/tc_act/tc_tunnel_key.h>
  21 #include <net/vxlan.h>
  22
  23 #include "bnxt_hsi.h"
  24 #include "bnxt.h"
  25 #include "bnxt_hwrm.h"
  26 #include "bnxt_sriov.h"
  27 #include "bnxt_tc.h"
  28 #include "bnxt_vfr.h"
  29
  30 #define BNXT_FID_INVALID                        0xffff
  31 #define VLAN_TCI(vid, prio)     ((vid) | ((prio) << VLAN_PRIO_SHIFT))
  32
  33 #define is_vlan_pcp_wildcarded(vlan_tci_mask)   \
  34         ((ntohs(vlan_tci_mask) & VLAN_PRIO_MASK) == 0x0000)
  35 #define is_vlan_pcp_exactmatch(vlan_tci_mask)   \
  36         ((ntohs(vlan_tci_mask) & VLAN_PRIO_MASK) == VLAN_PRIO_MASK)
  37 #define is_vlan_pcp_zero(vlan_tci)      \
  38         ((ntohs(vlan_tci) & VLAN_PRIO_MASK) == 0x0000)
  39 #define is_vid_exactmatch(vlan_tci_mask)        \
  40         ((ntohs(vlan_tci_mask) & VLAN_VID_MASK) == VLAN_VID_MASK)
  41
  42 static bool is_wildcard(void *mask, int len);
  43 static bool is_exactmatch(void *mask, int len);
  44 /* Return the dst fid of the func for flow forwarding
  45  * For PFs: src_fid is the fid of the PF
  46  * For VF-reps: src_fid the fid of the VF
  47  */
  48 static u16 bnxt_flow_get_dst_fid(struct bnxt *pf_bp, struct net_device *dev)
  49 {
  50         struct bnxt *bp;
  51
  52         /* check if dev belongs to the same switch */
  53         if (!netdev_port_same_parent_id(pf_bp->dev, dev)) {
  54                 netdev_info(pf_bp->dev, "dev(ifindex=%d) not on same switch\n",
  55                             dev->ifindex);
  56                 return BNXT_FID_INVALID;
  57         }
  58
  59         /* Is dev a VF-rep? */
  60         if (bnxt_dev_is_vf_rep(dev))
  61                 return bnxt_vf_rep_get_fid(dev);
  62
  63         bp = netdev_priv(dev);
  64         return bp->pf.fw_fid;
  65 }
  66
  67 static int bnxt_tc_parse_redir(struct bnxt *bp,
  68                                struct bnxt_tc_actions *actions,
  69                                const struct flow_action_entry *act)
  70 {
  71         struct net_device *dev = act->dev;
  72
  73         if (!dev) {
  74                 netdev_info(bp->dev, "no dev in mirred action\n");
  75                 return -EINVAL;
  76         }
  77
  78         actions->flags |= BNXT_TC_ACTION_FLAG_FWD;
  79         actions->dst_dev = dev;
  80         return 0;
  81 }
  82
  83 static int bnxt_tc_parse_vlan(struct bnxt *bp,
  84                               struct bnxt_tc_actions *actions,
  85                               const struct flow_action_entry *act)
  86 {
  87         switch (act->id) {
  88         case FLOW_ACTION_VLAN_POP:
  89                 actions->flags |= BNXT_TC_ACTION_FLAG_POP_VLAN;
  90                 break;
  91         case FLOW_ACTION_VLAN_PUSH:
  92                 actions->flags |= BNXT_TC_ACTION_FLAG_PUSH_VLAN;
  93                 actions->push_vlan_tci = htons(act->vlan.vid);
  94                 actions->push_vlan_tpid = act->vlan.proto;
  95                 break;
  96         default:
  97                 return -EOPNOTSUPP;
  98         }
  99         return 0;
 100 }
 101
 102 static int bnxt_tc_parse_tunnel_set(struct bnxt *bp,
 103                                     struct bnxt_tc_actions *actions,
 104                                     const struct flow_action_entry *act)
 105 {
 106         const struct ip_tunnel_info *tun_info = act->tunnel;
 107         const struct ip_tunnel_key *tun_key = &tun_info->key;
 108
 109         if (ip_tunnel_info_af(tun_info) != AF_INET) {
 110                 netdev_info(bp->dev, "only IPv4 tunnel-encap is supported\n");
 111                 return -EOPNOTSUPP;
 112         }
 113
 114         actions->tun_encap_key = *tun_key;
 115         actions->flags |= BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP;
 116         return 0;
 117 }
 118
 119 /* Key & Mask from the stack comes unaligned in multiple iterations of 4 bytes
 120  * each(u32).
 121  * This routine consolidates such multiple unaligned values into one
 122  * field each for Key & Mask (for src and dst macs separately)
 123  * For example,
 124  *                      Mask/Key        Offset  Iteration
 125  *                      ==========      ======  =========
 126  *      dst mac         0xffffffff      0       1
 127  *      dst mac         0x0000ffff      4       2
 128  *
 129  *      src mac         0xffff0000      4       1
 130  *      src mac         0xffffffff      8       2
 131  *
 132  * The above combination coming from the stack will be consolidated as
 133  *                      Mask/Key
 134  *                      ==============
 135  *      src mac:        0xffffffffffff
 136  *      dst mac:        0xffffffffffff
 137  */
 138 static void bnxt_set_l2_key_mask(u32 part_key, u32 part_mask,
 139                                  u8 *actual_key, u8 *actual_mask)
 140 {
 141         u32 key = get_unaligned((u32 *)actual_key);
 142         u32 mask = get_unaligned((u32 *)actual_mask);
 143
 144         part_key &= part_mask;
 145         part_key |= key & ~part_mask;
 146
 147         put_unaligned(mask | part_mask, (u32 *)actual_mask);
 148         put_unaligned(part_key, (u32 *)actual_key);
 149 }
 150
 151 static int
 152 bnxt_fill_l2_rewrite_fields(struct bnxt_tc_actions *actions,
 153                             u16 *eth_addr, u16 *eth_addr_mask)
 154 {
 155         u16 *p;
 156         int j;
 157
 158         if (unlikely(bnxt_eth_addr_key_mask_invalid(eth_addr, eth_addr_mask)))
 159                 return -EINVAL;
 160
 161         if (!is_wildcard(&eth_addr_mask[0], ETH_ALEN)) {
 162                 if (!is_exactmatch(&eth_addr_mask[0], ETH_ALEN))
 163                         return -EINVAL;
 164                 /* FW expects dmac to be in u16 array format */
 165                 p = eth_addr;
 166                 for (j = 0; j < 3; j++)
 167                         actions->l2_rewrite_dmac[j] = cpu_to_be16(*(p + j));
 168         }
 169
 170         if (!is_wildcard(&eth_addr_mask[ETH_ALEN / 2], ETH_ALEN)) {
 171                 if (!is_exactmatch(&eth_addr_mask[ETH_ALEN / 2], ETH_ALEN))
 172                         return -EINVAL;
 173                 /* FW expects smac to be in u16 array format */
 174                 p = &eth_addr[ETH_ALEN / 2];
 175                 for (j = 0; j < 3; j++)
 176                         actions->l2_rewrite_smac[j] = cpu_to_be16(*(p + j));
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int
 183 bnxt_tc_parse_pedit(struct bnxt *bp, struct bnxt_tc_actions *actions,
 184                     struct flow_action_entry *act, int act_idx, u8 *eth_addr,
 185                     u8 *eth_addr_mask)
 186 {
 187         size_t offset_of_ip6_daddr = offsetof(struct ipv6hdr, daddr);
 188         size_t offset_of_ip6_saddr = offsetof(struct ipv6hdr, saddr);
 189         u32 mask, val, offset, idx;
 190         u8 htype;
 191
 192         offset = act->mangle.offset;
 193         htype = act->mangle.htype;
 194         mask = ~act->mangle.mask;
 195         val = act->mangle.val;
 196
 197         switch (htype) {
 198         case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
 199                 if (offset > PEDIT_OFFSET_SMAC_LAST_4_BYTES) {
 200                         netdev_err(bp->dev,
 201                                    "%s: eth_hdr: Invalid pedit field\n",
 202                                    __func__);
 203                         return -EINVAL;
 204                 }
 205                 actions->flags |= BNXT_TC_ACTION_FLAG_L2_REWRITE;
 206
 207                 bnxt_set_l2_key_mask(val, mask, &eth_addr[offset],
 208                                      &eth_addr_mask[offset]);
 209                 break;
 210         case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
 211                 actions->flags |= BNXT_TC_ACTION_FLAG_NAT_XLATE;
 212                 actions->nat.l3_is_ipv4 = true;
 213                 if (offset ==  offsetof(struct iphdr, saddr)) {
 214                         actions->nat.src_xlate = true;
 215                         actions->nat.l3.ipv4.saddr.s_addr = htonl(val);
 216                 } else if (offset ==  offsetof(struct iphdr, daddr)) {
 217                         actions->nat.src_xlate = false;
 218                         actions->nat.l3.ipv4.daddr.s_addr = htonl(val);
 219                 } else {
 220                         netdev_err(bp->dev,
 221                                    "%s: IPv4_hdr: Invalid pedit field\n",
 222                                    __func__);
 223                         return -EINVAL;
 224                 }
 225
 226                 netdev_dbg(bp->dev, "nat.src_xlate = %d src IP: %pI4 dst ip : %pI4\n",
 227                            actions->nat.src_xlate, &actions->nat.l3.ipv4.saddr,
 228                            &actions->nat.l3.ipv4.daddr);
 229                 break;
 230
 231         case FLOW_ACT_MANGLE_HDR_TYPE_IP6:
 232                 actions->flags |= BNXT_TC_ACTION_FLAG_NAT_XLATE;
 233                 actions->nat.l3_is_ipv4 = false;
 234                 if (offset >= offsetof(struct ipv6hdr, saddr) &&
 235                     offset < offset_of_ip6_daddr) {
 236                         /* 16 byte IPv6 address comes in 4 iterations of
 237                          * 4byte chunks each
 238                          */
 239                         actions->nat.src_xlate = true;
 240                         idx = (offset - offset_of_ip6_saddr) / 4;
 241                         /* First 4bytes will be copied to idx 0 and so on */
 242                         actions->nat.l3.ipv6.saddr.s6_addr32[idx] = htonl(val);
 243                 } else if (offset >= offset_of_ip6_daddr &&
 244                            offset < offset_of_ip6_daddr + 16) {
 245                         actions->nat.src_xlate = false;
 246                         idx = (offset - offset_of_ip6_daddr) / 4;
 247                         actions->nat.l3.ipv6.saddr.s6_addr32[idx] = htonl(val);
 248                 } else {
 249                         netdev_err(bp->dev,
 250                                    "%s: IPv6_hdr: Invalid pedit field\n",
 251                                    __func__);
 252                         return -EINVAL;
 253                 }
 254                 break;
 255         case FLOW_ACT_MANGLE_HDR_TYPE_TCP:
 256         case FLOW_ACT_MANGLE_HDR_TYPE_UDP:
 257                 /* HW does not support L4 rewrite alone without L3
 258                  * rewrite
 259                  */
 260                 if (!(actions->flags & BNXT_TC_ACTION_FLAG_NAT_XLATE)) {
 261                         netdev_err(bp->dev,
 262                                    "Need to specify L3 rewrite as well\n");
 263                         return -EINVAL;
 264                 }
 265                 if (actions->nat.src_xlate)
 266                         actions->nat.l4.ports.sport = htons(val);
 267                 else
 268                         actions->nat.l4.ports.dport = htons(val);
 269                 netdev_dbg(bp->dev, "actions->nat.sport = %d dport = %d\n",
 270                            actions->nat.l4.ports.sport,
 271                            actions->nat.l4.ports.dport);
 272                 break;
 273         default:
 274                 netdev_err(bp->dev, "%s: Unsupported pedit hdr type\n",
 275                            __func__);
 276                 return -EINVAL;
 277         }
 278         return 0;
 279 }
 280
 281 static int bnxt_tc_parse_actions(struct bnxt *bp,
 282                                  struct bnxt_tc_actions *actions,
 283                                  struct flow_action *flow_action,
 284                                  struct netlink_ext_ack *extack)
 285 {
 286         /* Used to store the L2 rewrite mask for dmac (6 bytes) followed by
 287          * smac (6 bytes) if rewrite of both is specified, otherwise either
 288          * dmac or smac
 289          */
 290         u16 eth_addr_mask[ETH_ALEN] = { 0 };
 291         /* Used to store the L2 rewrite key for dmac (6 bytes) followed by
 292          * smac (6 bytes) if rewrite of both is specified, otherwise either
 293          * dmac or smac
 294          */
 295         u16 eth_addr[ETH_ALEN] = { 0 };
 296         struct flow_action_entry *act;
 297         int i, rc;
 298
 299         if (!flow_action_has_entries(flow_action)) {
 300                 netdev_info(bp->dev, "no actions\n");
 301                 return -EINVAL;
 302         }
 303
 304         if (!flow_action_basic_hw_stats_check(flow_action, extack))
 305                 return -EOPNOTSUPP;
 306
 307         flow_action_for_each(i, act, flow_action) {
 308                 switch (act->id) {
 309                 case FLOW_ACTION_DROP:
 310                         actions->flags |= BNXT_TC_ACTION_FLAG_DROP;
 311                         return 0; /* don't bother with other actions */
 312                 case FLOW_ACTION_REDIRECT:
 313                         rc = bnxt_tc_parse_redir(bp, actions, act);
 314                         if (rc)
 315                                 return rc;
 316                         break;
 317                 case FLOW_ACTION_VLAN_POP:
 318                 case FLOW_ACTION_VLAN_PUSH:
 319                 case FLOW_ACTION_VLAN_MANGLE:
 320                         rc = bnxt_tc_parse_vlan(bp, actions, act);
 321                         if (rc)
 322                                 return rc;
 323                         break;
 324                 case FLOW_ACTION_TUNNEL_ENCAP:
 325                         rc = bnxt_tc_parse_tunnel_set(bp, actions, act);
 326                         if (rc)
 327                                 return rc;
 328                         break;
 329                 case FLOW_ACTION_TUNNEL_DECAP:
 330                         actions->flags |= BNXT_TC_ACTION_FLAG_TUNNEL_DECAP;
 331                         break;
 332                 /* Packet edit: L2 rewrite, NAT, NAPT */
 333                 case FLOW_ACTION_MANGLE:
 334                         rc = bnxt_tc_parse_pedit(bp, actions, act, i,
 335                                                  (u8 *)eth_addr,
 336                                                  (u8 *)eth_addr_mask);
 337                         if (rc)
 338                                 return rc;
 339                         break;
 340                 default:
 341                         break;
 342                 }
 343         }
 344
 345         if (actions->flags & BNXT_TC_ACTION_FLAG_L2_REWRITE) {
 346                 rc = bnxt_fill_l2_rewrite_fields(actions, eth_addr,
 347                                                  eth_addr_mask);
 348                 if (rc)
 349                         return rc;
 350         }
 351
 352         if (actions->flags & BNXT_TC_ACTION_FLAG_FWD) {
 353                 if (actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP) {
 354                         /* dst_fid is PF's fid */
 355                         actions->dst_fid = bp->pf.fw_fid;
 356                 } else {
 357                         /* find the FID from dst_dev */
 358                         actions->dst_fid =
 359                                 bnxt_flow_get_dst_fid(bp, actions->dst_dev);
 360                         if (actions->dst_fid == BNXT_FID_INVALID)
 361                                 return -EINVAL;
 362                 }
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int bnxt_tc_parse_flow(struct bnxt *bp,
 369                               struct flow_cls_offload *tc_flow_cmd,
 370                               struct bnxt_tc_flow *flow)
 371 {
 372         struct flow_rule *rule = flow_cls_offload_flow_rule(tc_flow_cmd);
 373         struct flow_dissector *dissector = rule->match.dissector;
 374
 375         /* KEY_CONTROL and KEY_BASIC are needed for forming a meaningful key */
 376         if ((dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_CONTROL)) == 0 ||
 377             (dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_BASIC)) == 0) {
 378                 netdev_info(bp->dev, "cannot form TC key: used_keys = 0x%x\n",
 379                             dissector->used_keys);
 380                 return -EOPNOTSUPP;
 381         }
 382
 383         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
 384                 struct flow_match_basic match;
 385
 386                 flow_rule_match_basic(rule, &match);
 387                 flow->l2_key.ether_type = match.key->n_proto;
 388                 flow->l2_mask.ether_type = match.mask->n_proto;
 389
 390                 if (match.key->n_proto == htons(ETH_P_IP) ||
 391                     match.key->n_proto == htons(ETH_P_IPV6)) {
 392                         flow->l4_key.ip_proto = match.key->ip_proto;
 393                         flow->l4_mask.ip_proto = match.mask->ip_proto;
 394                 }
 395         }
 396
 397         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
 398                 struct flow_match_eth_addrs match;
 399
 400                 flow_rule_match_eth_addrs(rule, &match);
 401                 flow->flags |= BNXT_TC_FLOW_FLAGS_ETH_ADDRS;
 402                 ether_addr_copy(flow->l2_key.dmac, match.key->dst);
 403                 ether_addr_copy(flow->l2_mask.dmac, match.mask->dst);
 404                 ether_addr_copy(flow->l2_key.smac, match.key->src);
 405                 ether_addr_copy(flow->l2_mask.smac, match.mask->src);
 406         }
 407
 408         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
 409                 struct flow_match_vlan match;
 410
 411                 flow_rule_match_vlan(rule, &match);
 412                 flow->l2_key.inner_vlan_tci =
 413                         cpu_to_be16(VLAN_TCI(match.key->vlan_id,
 414                                              match.key->vlan_priority));
 415                 flow->l2_mask.inner_vlan_tci =
 416                         cpu_to_be16((VLAN_TCI(match.mask->vlan_id,
 417                                               match.mask->vlan_priority)));
 418                 flow->l2_key.inner_vlan_tpid = htons(ETH_P_8021Q);
 419                 flow->l2_mask.inner_vlan_tpid = htons(0xffff);
 420                 flow->l2_key.num_vlans = 1;
 421         }
 422
 423         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
 424                 struct flow_match_ipv4_addrs match;
 425
 426                 flow_rule_match_ipv4_addrs(rule, &match);
 427                 flow->flags |= BNXT_TC_FLOW_FLAGS_IPV4_ADDRS;
 428                 flow->l3_key.ipv4.daddr.s_addr = match.key->dst;
 429                 flow->l3_mask.ipv4.daddr.s_addr = match.mask->dst;
 430                 flow->l3_key.ipv4.saddr.s_addr = match.key->src;
 431                 flow->l3_mask.ipv4.saddr.s_addr = match.mask->src;
 432         } else if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
 433                 struct flow_match_ipv6_addrs match;
 434
 435                 flow_rule_match_ipv6_addrs(rule, &match);
 436                 flow->flags |= BNXT_TC_FLOW_FLAGS_IPV6_ADDRS;
 437                 flow->l3_key.ipv6.daddr = match.key->dst;
 438                 flow->l3_mask.ipv6.daddr = match.mask->dst;
 439                 flow->l3_key.ipv6.saddr = match.key->src;
 440                 flow->l3_mask.ipv6.saddr = match.mask->src;
 441         }
 442
 443         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
 444                 struct flow_match_ports match;
 445
 446                 flow_rule_match_ports(rule, &match);
 447                 flow->flags |= BNXT_TC_FLOW_FLAGS_PORTS;
 448                 flow->l4_key.ports.dport = match.key->dst;
 449                 flow->l4_mask.ports.dport = match.mask->dst;
 450                 flow->l4_key.ports.sport = match.key->src;
 451                 flow->l4_mask.ports.sport = match.mask->src;
 452         }
 453
 454         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP)) {
 455                 struct flow_match_icmp match;
 456
 457                 flow_rule_match_icmp(rule, &match);
 458                 flow->flags |= BNXT_TC_FLOW_FLAGS_ICMP;
 459                 flow->l4_key.icmp.type = match.key->type;
 460                 flow->l4_key.icmp.code = match.key->code;
 461                 flow->l4_mask.icmp.type = match.mask->type;
 462                 flow->l4_mask.icmp.code = match.mask->code;
 463         }
 464
 465         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
 466                 struct flow_match_ipv4_addrs match;
 467
 468                 flow_rule_match_enc_ipv4_addrs(rule, &match);
 469                 flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_IPV4_ADDRS;
 470                 flow->tun_key.u.ipv4.dst = match.key->dst;
 471                 flow->tun_mask.u.ipv4.dst = match.mask->dst;
 472                 flow->tun_key.u.ipv4.src = match.key->src;
 473                 flow->tun_mask.u.ipv4.src = match.mask->src;
 474         } else if (flow_rule_match_key(rule,
 475                                       FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 476                 return -EOPNOTSUPP;
 477         }
 478
 479         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
 480                 struct flow_match_enc_keyid match;
 481
 482                 flow_rule_match_enc_keyid(rule, &match);
 483                 flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_ID;
 484                 flow->tun_key.tun_id = key32_to_tunnel_id(match.key->keyid);
 485                 flow->tun_mask.tun_id = key32_to_tunnel_id(match.mask->keyid);
 486         }
 487
 488         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 489                 struct flow_match_ports match;
 490
 491                 flow_rule_match_enc_ports(rule, &match);
 492                 flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_PORTS;
 493                 flow->tun_key.tp_dst = match.key->dst;
 494                 flow->tun_mask.tp_dst = match.mask->dst;
 495                 flow->tun_key.tp_src = match.key->src;
 496                 flow->tun_mask.tp_src = match.mask->src;
 497         }
 498
 499         return bnxt_tc_parse_actions(bp, &flow->actions, &rule->action,
 500                                      tc_flow_cmd->common.extack);
 501 }
 502
 503 static int bnxt_hwrm_cfa_flow_free(struct bnxt *bp,
 504                                    struct bnxt_tc_flow_node *flow_node)
 505 {
 506         struct hwrm_cfa_flow_free_input *req;
 507         int rc;
 508
 509         rc = hwrm_req_init(bp, req, HWRM_CFA_FLOW_FREE);
 510         if (!rc) {
 511                 if (bp->fw_cap & BNXT_FW_CAP_OVS_64BIT_HANDLE)
 512                         req->ext_flow_handle = flow_node->ext_flow_handle;
 513                 else
 514                         req->flow_handle = flow_node->flow_handle;
 515
 516                 rc = hwrm_req_send(bp, req);
 517         }
 518         if (rc)
 519                 netdev_info(bp->dev, "%s: Error rc=%d\n", __func__, rc);
 520
 521         return rc;
 522 }
 523
 524 static int ipv6_mask_len(struct in6_addr *mask)
 525 {
 526         int mask_len = 0, i;
 527
 528         for (i = 0; i < 4; i++)
 529                 mask_len += inet_mask_len(mask->s6_addr32[i]);
 530
 531         return mask_len;
 532 }
 533
 534 static bool is_wildcard(void *mask, int len)
 535 {
 536         const u8 *p = mask;
 537         int i;
 538
 539         for (i = 0; i < len; i++) {
 540                 if (p[i] != 0)
 541                         return false;
 542         }
 543         return true;
 544 }
 545
 546 static bool is_exactmatch(void *mask, int len)
 547 {
 548         const u8 *p = mask;
 549         int i;
 550
 551         for (i = 0; i < len; i++)
 552                 if (p[i] != 0xff)
 553                         return false;
 554
 555         return true;
 556 }
 557
 558 static bool is_vlan_tci_allowed(__be16  vlan_tci_mask,
 559                                 __be16  vlan_tci)
 560 {
 561         /* VLAN priority must be either exactly zero or fully wildcarded and
 562          * VLAN id must be exact match.
 563          */
 564         if (is_vid_exactmatch(vlan_tci_mask) &&
 565             ((is_vlan_pcp_exactmatch(vlan_tci_mask) &&
 566               is_vlan_pcp_zero(vlan_tci)) ||
 567              is_vlan_pcp_wildcarded(vlan_tci_mask)))
 568                 return true;
 569
 570         return false;
 571 }
 572
 573 static bool bits_set(void *key, int len)
 574 {
 575         const u8 *p = key;
 576         int i;
 577
 578         for (i = 0; i < len; i++)
 579                 if (p[i] != 0)
 580                         return true;
 581
 582         return false;
 583 }
 584
 585 static int bnxt_hwrm_cfa_flow_alloc(struct bnxt *bp, struct bnxt_tc_flow *flow,
 586                                     __le16 ref_flow_handle,
 587                                     __le32 tunnel_handle,
 588                                     struct bnxt_tc_flow_node *flow_node)
 589 {
 590         struct bnxt_tc_actions *actions = &flow->actions;
 591         struct bnxt_tc_l3_key *l3_mask = &flow->l3_mask;
 592         struct bnxt_tc_l3_key *l3_key = &flow->l3_key;
 593         struct hwrm_cfa_flow_alloc_output *resp;
 594         struct hwrm_cfa_flow_alloc_input *req;
 595         u16 flow_flags = 0, action_flags = 0;
 596         int rc;
 597
 598         rc = hwrm_req_init(bp, req, HWRM_CFA_FLOW_ALLOC);
 599         if (rc)
 600                 return rc;
 601
 602         req->src_fid = cpu_to_le16(flow->src_fid);
 603         req->ref_flow_handle = ref_flow_handle;
 604
 605         if (actions->flags & BNXT_TC_ACTION_FLAG_L2_REWRITE) {
 606                 memcpy(req->l2_rewrite_dmac, actions->l2_rewrite_dmac,
 607                        ETH_ALEN);
 608                 memcpy(req->l2_rewrite_smac, actions->l2_rewrite_smac,
 609                        ETH_ALEN);
 610                 action_flags |=
 611                         CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE;
 612         }
 613
 614         if (actions->flags & BNXT_TC_ACTION_FLAG_NAT_XLATE) {
 615                 if (actions->nat.l3_is_ipv4) {
 616                         action_flags |=
 617                                 CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_IPV4_ADDRESS;
 618
 619                         if (actions->nat.src_xlate) {
 620                                 action_flags |=
 621                                         CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_SRC;
 622                                 /* L3 source rewrite */
 623                                 req->nat_ip_address[0] =
 624                                         actions->nat.l3.ipv4.saddr.s_addr;
 625                                 /* L4 source port */
 626                                 if (actions->nat.l4.ports.sport)
 627                                         req->nat_port =
 628                                                 actions->nat.l4.ports.sport;
 629                         } else {
 630                                 action_flags |=
 631                                         CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_DEST;
 632                                 /* L3 destination rewrite */
 633                                 req->nat_ip_address[0] =
 634                                         actions->nat.l3.ipv4.daddr.s_addr;
 635                                 /* L4 destination port */
 636                                 if (actions->nat.l4.ports.dport)
 637                                         req->nat_port =
 638                                                 actions->nat.l4.ports.dport;
 639                         }
 640                         netdev_dbg(bp->dev,
 641                                    "req->nat_ip_address: %pI4 src_xlate: %d req->nat_port: %x\n",
 642                                    req->nat_ip_address, actions->nat.src_xlate,
 643                                    req->nat_port);
 644                 } else {
 645                         if (actions->nat.src_xlate) {
 646                                 action_flags |=
 647                                         CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_SRC;
 648                                 /* L3 source rewrite */
 649                                 memcpy(req->nat_ip_address,
 650                                        actions->nat.l3.ipv6.saddr.s6_addr32,
 651                                        sizeof(req->nat_ip_address));
 652                                 /* L4 source port */
 653                                 if (actions->nat.l4.ports.sport)
 654                                         req->nat_port =
 655                                                 actions->nat.l4.ports.sport;
 656                         } else {
 657                                 action_flags |=
 658                                         CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_DEST;
 659                                 /* L3 destination rewrite */
 660                                 memcpy(req->nat_ip_address,
 661                                        actions->nat.l3.ipv6.daddr.s6_addr32,
 662                                        sizeof(req->nat_ip_address));
 663                                 /* L4 destination port */
 664                                 if (actions->nat.l4.ports.dport)
 665                                         req->nat_port =
 666                                                 actions->nat.l4.ports.dport;
 667                         }
 668                         netdev_dbg(bp->dev,
 669                                    "req->nat_ip_address: %pI6 src_xlate: %d req->nat_port: %x\n",
 670                                    req->nat_ip_address, actions->nat.src_xlate,
 671                                    req->nat_port);
 672                 }
 673         }
 674
 675         if (actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_DECAP ||
 676             actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP) {
 677                 req->tunnel_handle = tunnel_handle;
 678                 flow_flags |= CFA_FLOW_ALLOC_REQ_FLAGS_TUNNEL;
 679                 action_flags |= CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_TUNNEL;
 680         }
 681
 682         req->ethertype = flow->l2_key.ether_type;
 683         req->ip_proto = flow->l4_key.ip_proto;
 684
 685         if (flow->flags & BNXT_TC_FLOW_FLAGS_ETH_ADDRS) {
 686                 memcpy(req->dmac, flow->l2_key.dmac, ETH_ALEN);
 687                 memcpy(req->smac, flow->l2_key.smac, ETH_ALEN);
 688         }
 689
 690         if (flow->l2_key.num_vlans > 0) {
 691                 flow_flags |= CFA_FLOW_ALLOC_REQ_FLAGS_NUM_VLAN_ONE;
 692                 /* FW expects the inner_vlan_tci value to be set
 693                  * in outer_vlan_tci when num_vlans is 1 (which is
 694                  * always the case in TC.)
 695                  */
 696                 req->outer_vlan_tci = flow->l2_key.inner_vlan_tci;
 697         }
 698
 699         /* If all IP and L4 fields are wildcarded then this is an L2 flow */
 700         if (is_wildcard(l3_mask, sizeof(*l3_mask)) &&
 701             is_wildcard(&flow->l4_mask, sizeof(flow->l4_mask))) {
 702                 flow_flags |= CFA_FLOW_ALLOC_REQ_FLAGS_FLOWTYPE_L2;
 703         } else {
 704                 flow_flags |= flow->l2_key.ether_type == htons(ETH_P_IP) ?
 705                                 CFA_FLOW_ALLOC_REQ_FLAGS_FLOWTYPE_IPV4 :
 706                                 CFA_FLOW_ALLOC_REQ_FLAGS_FLOWTYPE_IPV6;
 707
 708                 if (flow->flags & BNXT_TC_FLOW_FLAGS_IPV4_ADDRS) {
 709                         req->ip_dst[0] = l3_key->ipv4.daddr.s_addr;
 710                         req->ip_dst_mask_len =
 711                                 inet_mask_len(l3_mask->ipv4.daddr.s_addr);
 712                         req->ip_src[0] = l3_key->ipv4.saddr.s_addr;
 713                         req->ip_src_mask_len =
 714                                 inet_mask_len(l3_mask->ipv4.saddr.s_addr);
 715                 } else if (flow->flags & BNXT_TC_FLOW_FLAGS_IPV6_ADDRS) {
 716                         memcpy(req->ip_dst, l3_key->ipv6.daddr.s6_addr32,
 717                                sizeof(req->ip_dst));
 718                         req->ip_dst_mask_len =
 719                                         ipv6_mask_len(&l3_mask->ipv6.daddr);
 720                         memcpy(req->ip_src, l3_key->ipv6.saddr.s6_addr32,
 721                                sizeof(req->ip_src));
 722                         req->ip_src_mask_len =
 723                                         ipv6_mask_len(&l3_mask->ipv6.saddr);
 724                 }
 725         }
 726
 727         if (flow->flags & BNXT_TC_FLOW_FLAGS_PORTS) {
 728                 req->l4_src_port = flow->l4_key.ports.sport;
 729                 req->l4_src_port_mask = flow->l4_mask.ports.sport;
 730                 req->l4_dst_port = flow->l4_key.ports.dport;
 731                 req->l4_dst_port_mask = flow->l4_mask.ports.dport;
 732         } else if (flow->flags & BNXT_TC_FLOW_FLAGS_ICMP) {
 733                 /* l4 ports serve as type/code when ip_proto is ICMP */
 734                 req->l4_src_port = htons(flow->l4_key.icmp.type);
 735                 req->l4_src_port_mask = htons(flow->l4_mask.icmp.type);
 736                 req->l4_dst_port = htons(flow->l4_key.icmp.code);
 737                 req->l4_dst_port_mask = htons(flow->l4_mask.icmp.code);
 738         }
 739         req->flags = cpu_to_le16(flow_flags);
 740
 741         if (actions->flags & BNXT_TC_ACTION_FLAG_DROP) {
 742                 action_flags |= CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_DROP;
 743         } else {
 744                 if (actions->flags & BNXT_TC_ACTION_FLAG_FWD) {
 745                         action_flags |= CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_FWD;
 746                         req->dst_fid = cpu_to_le16(actions->dst_fid);
 747                 }
 748                 if (actions->flags & BNXT_TC_ACTION_FLAG_PUSH_VLAN) {
 749                         action_flags |=
 750                             CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE;
 751                         req->l2_rewrite_vlan_tpid = actions->push_vlan_tpid;
 752                         req->l2_rewrite_vlan_tci = actions->push_vlan_tci;
 753                         memcpy(&req->l2_rewrite_dmac, &req->dmac, ETH_ALEN);
 754                         memcpy(&req->l2_rewrite_smac, &req->smac, ETH_ALEN);
 755                 }
 756                 if (actions->flags & BNXT_TC_ACTION_FLAG_POP_VLAN) {
 757                         action_flags |=
 758                             CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE;
 759                         /* Rewrite config with tpid = 0 implies vlan pop */
 760                         req->l2_rewrite_vlan_tpid = 0;
 761                         memcpy(&req->l2_rewrite_dmac, &req->dmac, ETH_ALEN);
 762                         memcpy(&req->l2_rewrite_smac, &req->smac, ETH_ALEN);
 763                 }
 764         }
 765         req->action_flags = cpu_to_le16(action_flags);
 766
 767         resp = hwrm_req_hold(bp, req);
 768         rc = hwrm_req_send_silent(bp, req);
 769         if (!rc) {
 770                 /* CFA_FLOW_ALLOC response interpretation:
 771                  *                  fw with          fw with
 772                  *                  16-bit           64-bit
 773                  *                  flow handle      flow handle
 774                  *                  ===========      ===========
 775                  * flow_handle      flow handle      flow context id
 776                  * ext_flow_handle  INVALID          flow handle
 777                  * flow_id          INVALID          flow counter id
 778                  */
 779                 flow_node->flow_handle = resp->flow_handle;
 780                 if (bp->fw_cap & BNXT_FW_CAP_OVS_64BIT_HANDLE) {
 781                         flow_node->ext_flow_handle = resp->ext_flow_handle;
 782                         flow_node->flow_id = resp->flow_id;
 783                 }
 784         }
 785         hwrm_req_drop(bp, req);
 786         return rc;
 787 }
 788
 789 static int hwrm_cfa_decap_filter_alloc(struct bnxt *bp,
 790                                        struct bnxt_tc_flow *flow,
 791                                        struct bnxt_tc_l2_key *l2_info,
 792                                        __le32 ref_decap_handle,
 793                                        __le32 *decap_filter_handle)
 794 {
 795         struct hwrm_cfa_decap_filter_alloc_output *resp;
 796         struct ip_tunnel_key *tun_key = &flow->tun_key;
 797         struct hwrm_cfa_decap_filter_alloc_input *req;
 798         u32 enables = 0;
 799         int rc;
 800
 801         rc = hwrm_req_init(bp, req, HWRM_CFA_DECAP_FILTER_ALLOC);
 802         if (rc)
 803                 goto exit;
 804
 805         req->flags = cpu_to_le32(CFA_DECAP_FILTER_ALLOC_REQ_FLAGS_OVS_TUNNEL);
 806         enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_TUNNEL_TYPE |
 807                    CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_IP_PROTOCOL;
 808         req->tunnel_type = CFA_DECAP_FILTER_ALLOC_REQ_TUNNEL_TYPE_VXLAN;
 809         req->ip_protocol = CFA_DECAP_FILTER_ALLOC_REQ_IP_PROTOCOL_UDP;
 810
 811         if (flow->flags & BNXT_TC_FLOW_FLAGS_TUNL_ID) {
 812                 enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_TUNNEL_ID;
 813                 /* tunnel_id is wrongly defined in hsi defn. as __le32 */
 814                 req->tunnel_id = tunnel_id_to_key32(tun_key->tun_id);
 815         }
 816
 817         if (flow->flags & BNXT_TC_FLOW_FLAGS_TUNL_ETH_ADDRS) {
 818                 enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_DST_MACADDR;
 819                 ether_addr_copy(req->dst_macaddr, l2_info->dmac);
 820         }
 821         if (l2_info->num_vlans) {
 822                 enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_T_IVLAN_VID;
 823                 req->t_ivlan_vid = l2_info->inner_vlan_tci;
 824         }
 825
 826         enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_ETHERTYPE;
 827         req->ethertype = htons(ETH_P_IP);
 828
 829         if (flow->flags & BNXT_TC_FLOW_FLAGS_TUNL_IPV4_ADDRS) {
 830                 enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_SRC_IPADDR |
 831                            CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_DST_IPADDR |
 832                            CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_IPADDR_TYPE;
 833                 req->ip_addr_type =
 834                         CFA_DECAP_FILTER_ALLOC_REQ_IP_ADDR_TYPE_IPV4;
 835                 req->dst_ipaddr[0] = tun_key->u.ipv4.dst;
 836                 req->src_ipaddr[0] = tun_key->u.ipv4.src;
 837         }
 838
 839         if (flow->flags & BNXT_TC_FLOW_FLAGS_TUNL_PORTS) {
 840                 enables |= CFA_DECAP_FILTER_ALLOC_REQ_ENABLES_DST_PORT;
 841                 req->dst_port = tun_key->tp_dst;
 842         }
 843
 844         /* Eventhough the decap_handle returned by hwrm_cfa_decap_filter_alloc
 845          * is defined as __le32, l2_ctxt_ref_id is defined in HSI as __le16.
 846          */
 847         req->l2_ctxt_ref_id = (__force __le16)ref_decap_handle;
 848         req->enables = cpu_to_le32(enables);
 849
 850         resp = hwrm_req_hold(bp, req);
 851         rc = hwrm_req_send_silent(bp, req);
 852         if (!rc)
 853                 *decap_filter_handle = resp->decap_filter_id;
 854         hwrm_req_drop(bp, req);
 855 exit:
 856         if (rc)
 857                 netdev_info(bp->dev, "%s: Error rc=%d\n", __func__, rc);
 858
 859         return rc;
 860 }
 861
 862 static int hwrm_cfa_decap_filter_free(struct bnxt *bp,
 863                                       __le32 decap_filter_handle)
 864 {
 865         struct hwrm_cfa_decap_filter_free_input *req;
 866         int rc;
 867
 868         rc = hwrm_req_init(bp, req, HWRM_CFA_DECAP_FILTER_FREE);
 869         if (!rc) {
 870                 req->decap_filter_id = decap_filter_handle;
 871                 rc = hwrm_req_send(bp, req);
 872         }
 873         if (rc)
 874                 netdev_info(bp->dev, "%s: Error rc=%d\n", __func__, rc);
 875
 876         return rc;
 877 }
 878
 879 static int hwrm_cfa_encap_record_alloc(struct bnxt *bp,
 880                                        struct ip_tunnel_key *encap_key,
 881                                        struct bnxt_tc_l2_key *l2_info,
 882                                        __le32 *encap_record_handle)
 883 {
 884         struct hwrm_cfa_encap_record_alloc_output *resp;
 885         struct hwrm_cfa_encap_record_alloc_input *req;
 886         struct hwrm_cfa_encap_data_vxlan *encap;
 887         struct hwrm_vxlan_ipv4_hdr *encap_ipv4;
 888         int rc;
 889
 890         rc = hwrm_req_init(bp, req, HWRM_CFA_ENCAP_RECORD_ALLOC);
 891         if (rc)
 892                 goto exit;
 893
 894         encap = (struct hwrm_cfa_encap_data_vxlan *)&req->encap_data;
 895         req->encap_type = CFA_ENCAP_RECORD_ALLOC_REQ_ENCAP_TYPE_VXLAN;
 896         ether_addr_copy(encap->dst_mac_addr, l2_info->dmac);
 897         ether_addr_copy(encap->src_mac_addr, l2_info->smac);
 898         if (l2_info->num_vlans) {
 899                 encap->num_vlan_tags = l2_info->num_vlans;
 900                 encap->ovlan_tci = l2_info->inner_vlan_tci;
 901                 encap->ovlan_tpid = l2_info->inner_vlan_tpid;
 902         }
 903
 904         encap_ipv4 = (struct hwrm_vxlan_ipv4_hdr *)encap->l3;
 905         encap_ipv4->ver_hlen = 4 << VXLAN_IPV4_HDR_VER_HLEN_VERSION_SFT;
 906         encap_ipv4->ver_hlen |= 5 << VXLAN_IPV4_HDR_VER_HLEN_HEADER_LENGTH_SFT;
 907         encap_ipv4->ttl = encap_key->ttl;
 908
 909         encap_ipv4->dest_ip_addr = encap_key->u.ipv4.dst;
 910         encap_ipv4->src_ip_addr = encap_key->u.ipv4.src;
 911         encap_ipv4->protocol = IPPROTO_UDP;
 912
 913         encap->dst_port = encap_key->tp_dst;
 914         encap->vni = tunnel_id_to_key32(encap_key->tun_id);
 915
 916         resp = hwrm_req_hold(bp, req);
 917         rc = hwrm_req_send_silent(bp, req);
 918         if (!rc)
 919                 *encap_record_handle = resp->encap_record_id;
 920         hwrm_req_drop(bp, req);
 921 exit:
 922         if (rc)
 923                 netdev_info(bp->dev, "%s: Error rc=%d\n", __func__, rc);
 924
 925         return rc;
 926 }
 927
 928 static int hwrm_cfa_encap_record_free(struct bnxt *bp,
 929                                       __le32 encap_record_handle)
 930 {
 931         struct hwrm_cfa_encap_record_free_input *req;
 932         int rc;
 933
 934         rc = hwrm_req_init(bp, req, HWRM_CFA_ENCAP_RECORD_FREE);
 935         if (!rc) {
 936                 req->encap_record_id = encap_record_handle;
 937                 rc = hwrm_req_send(bp, req);
 938         }
 939         if (rc)
 940                 netdev_info(bp->dev, "%s: Error rc=%d\n", __func__, rc);
 941
 942         return rc;
 943 }
 944
 945 static int bnxt_tc_put_l2_node(struct bnxt *bp,
 946                                struct bnxt_tc_flow_node *flow_node)
 947 {
 948         struct bnxt_tc_l2_node *l2_node = flow_node->l2_node;
 949         struct bnxt_tc_info *tc_info = bp->tc_info;
 950         int rc;
 951
 952         /* remove flow_node from the L2 shared flow list */
 953         list_del(&flow_node->l2_list_node);
 954         if (--l2_node->refcount == 0) {
 955                 rc =  rhashtable_remove_fast(&tc_info->l2_table, &l2_node->node,
 956                                              tc_info->l2_ht_params);
 957                 if (rc)
 958                         netdev_err(bp->dev,
 959                                    "Error: %s: rhashtable_remove_fast: %d\n",
 960                                    __func__, rc);
 961                 kfree_rcu(l2_node, rcu);
 962         }
 963         return 0;
 964 }
 965
 966 static struct bnxt_tc_l2_node *
 967 bnxt_tc_get_l2_node(struct bnxt *bp, struct rhashtable *l2_table,
 968                     struct rhashtable_params ht_params,
 969                     struct bnxt_tc_l2_key *l2_key)
 970 {
 971         struct bnxt_tc_l2_node *l2_node;
 972         int rc;
 973
 974         l2_node = rhashtable_lookup_fast(l2_table, l2_key, ht_params);
 975         if (!l2_node) {
 976                 l2_node = kzalloc(sizeof(*l2_node), GFP_KERNEL);
 977                 if (!l2_node) {
 978                         rc = -ENOMEM;
 979                         return NULL;
 980                 }
 981
 982                 l2_node->key = *l2_key;
 983                 rc = rhashtable_insert_fast(l2_table, &l2_node->node,
 984                                             ht_params);
 985                 if (rc) {
 986                         kfree_rcu(l2_node, rcu);
 987                         netdev_err(bp->dev,
 988                                    "Error: %s: rhashtable_insert_fast: %d\n",
 989                                    __func__, rc);
 990                         return NULL;
 991                 }
 992                 INIT_LIST_HEAD(&l2_node->common_l2_flows);
 993         }
 994         return l2_node;
 995 }
 996
 997 /* Get the ref_flow_handle for a flow by checking if there are any other
 998  * flows that share the same L2 key as this flow.
 999  */
1000 static int
1001 bnxt_tc_get_ref_flow_handle(struct bnxt *bp, struct bnxt_tc_flow *flow,
1002                             struct bnxt_tc_flow_node *flow_node,
1003                             __le16 *ref_flow_handle)
1004 {
1005         struct bnxt_tc_info *tc_info = bp->tc_info;
1006         struct bnxt_tc_flow_node *ref_flow_node;
1007         struct bnxt_tc_l2_node *l2_node;
1008
1009         l2_node = bnxt_tc_get_l2_node(bp, &tc_info->l2_table,
1010                                       tc_info->l2_ht_params,
1011                                       &flow->l2_key);
1012         if (!l2_node)
1013                 return -1;
1014
1015         /* If any other flow is using this l2_node, use it's flow_handle
1016          * as the ref_flow_handle
1017          */
1018         if (l2_node->refcount > 0) {
1019                 ref_flow_node = list_first_entry(&l2_node->common_l2_flows,
1020                                                  struct bnxt_tc_flow_node,
1021                                                  l2_list_node);
1022                 *ref_flow_handle = ref_flow_node->flow_handle;
1023         } else {
1024                 *ref_flow_handle = cpu_to_le16(0xffff);
1025         }
1026
1027         /* Insert the l2_node into the flow_node so that subsequent flows
1028          * with a matching l2 key can use the flow_handle of this flow
1029          * as their ref_flow_handle
1030          */
1031         flow_node->l2_node = l2_node;
1032         list_add(&flow_node->l2_list_node, &l2_node->common_l2_flows);
1033         l2_node->refcount++;
1034         return 0;
1035 }
1036
1037 /* After the flow parsing is done, this routine is used for checking
1038  * if there are any aspects of the flow that prevent it from being
1039  * offloaded.
1040  */
1041 static bool bnxt_tc_can_offload(struct bnxt *bp, struct bnxt_tc_flow *flow)
1042 {
1043         /* If L4 ports are specified then ip_proto must be TCP or UDP */
1044         if ((flow->flags & BNXT_TC_FLOW_FLAGS_PORTS) &&
1045             (flow->l4_key.ip_proto != IPPROTO_TCP &&
1046              flow->l4_key.ip_proto != IPPROTO_UDP)) {
1047                 netdev_info(bp->dev, "Cannot offload non-TCP/UDP (%d) ports\n",
1048                             flow->l4_key.ip_proto);
1049                 return false;
1050         }
1051
1052         /* Currently source/dest MAC cannot be partial wildcard  */
1053         if (bits_set(&flow->l2_key.smac, sizeof(flow->l2_key.smac)) &&
1054             !is_exactmatch(flow->l2_mask.smac, sizeof(flow->l2_mask.smac))) {
1055                 netdev_info(bp->dev, "Wildcard match unsupported for Source MAC\n");
1056                 return false;
1057         }
1058         if (bits_set(&flow->l2_key.dmac, sizeof(flow->l2_key.dmac)) &&
1059             !is_exactmatch(&flow->l2_mask.dmac, sizeof(flow->l2_mask.dmac))) {
1060                 netdev_info(bp->dev, "Wildcard match unsupported for Dest MAC\n");
1061                 return false;
1062         }
1063
1064         /* Currently VLAN fields cannot be partial wildcard */
1065         if (bits_set(&flow->l2_key.inner_vlan_tci,
1066                      sizeof(flow->l2_key.inner_vlan_tci)) &&
1067             !is_vlan_tci_allowed(flow->l2_mask.inner_vlan_tci,
1068                                  flow->l2_key.inner_vlan_tci)) {
1069                 netdev_info(bp->dev, "Unsupported VLAN TCI\n");
1070                 return false;
1071         }
1072         if (bits_set(&flow->l2_key.inner_vlan_tpid,
1073                      sizeof(flow->l2_key.inner_vlan_tpid)) &&
1074             !is_exactmatch(&flow->l2_mask.inner_vlan_tpid,
1075                            sizeof(flow->l2_mask.inner_vlan_tpid))) {
1076                 netdev_info(bp->dev, "Wildcard match unsupported for VLAN TPID\n");
1077                 return false;
1078         }
1079
1080         /* Currently Ethertype must be set */
1081         if (!is_exactmatch(&flow->l2_mask.ether_type,
1082                            sizeof(flow->l2_mask.ether_type))) {
1083                 netdev_info(bp->dev, "Wildcard match unsupported for Ethertype\n");
1084                 return false;
1085         }
1086
1087         return true;
1088 }
1089
1090 /* Returns the final refcount of the node on success
1091  * or a -ve error code on failure
1092  */
1093 static int bnxt_tc_put_tunnel_node(struct bnxt *bp,
1094                                    struct rhashtable *tunnel_table,
1095                                    struct rhashtable_params *ht_params,
1096                                    struct bnxt_tc_tunnel_node *tunnel_node)
1097 {
1098         int rc;
1099
1100         if (--tunnel_node->refcount == 0) {
1101                 rc =  rhashtable_remove_fast(tunnel_table, &tunnel_node->node,
1102                                              *ht_params);
1103                 if (rc) {
1104                         netdev_err(bp->dev, "rhashtable_remove_fast rc=%d\n", rc);
1105                         rc = -1;
1106                 }
1107                 kfree_rcu(tunnel_node, rcu);
1108                 return rc;
1109         } else {
1110                 return tunnel_node->refcount;
1111         }
1112 }
1113
1114 /* Get (or add) either encap or decap tunnel node from/to the supplied
1115  * hash table.
1116  */
1117 static struct bnxt_tc_tunnel_node *
1118 bnxt_tc_get_tunnel_node(struct bnxt *bp, struct rhashtable *tunnel_table,
1119                         struct rhashtable_params *ht_params,
1120                         struct ip_tunnel_key *tun_key)
1121 {
1122         struct bnxt_tc_tunnel_node *tunnel_node;
1123         int rc;
1124
1125         tunnel_node = rhashtable_lookup_fast(tunnel_table, tun_key, *ht_params);
1126         if (!tunnel_node) {
1127                 tunnel_node = kzalloc(sizeof(*tunnel_node), GFP_KERNEL);
1128                 if (!tunnel_node) {
1129                         rc = -ENOMEM;
1130                         goto err;
1131                 }
1132
1133                 tunnel_node->key = *tun_key;
1134                 tunnel_node->tunnel_handle = INVALID_TUNNEL_HANDLE;
1135                 rc = rhashtable_insert_fast(tunnel_table, &tunnel_node->node,
1136                                             *ht_params);
1137                 if (rc) {
1138                         kfree_rcu(tunnel_node, rcu);
1139                         goto err;
1140                 }
1141         }
1142         tunnel_node->refcount++;
1143         return tunnel_node;
1144 err:
1145         netdev_info(bp->dev, "error rc=%d\n", rc);
1146         return NULL;
1147 }
1148
1149 static int bnxt_tc_get_ref_decap_handle(struct bnxt *bp,
1150                                         struct bnxt_tc_flow *flow,
1151                                         struct bnxt_tc_l2_key *l2_key,
1152                                         struct bnxt_tc_flow_node *flow_node,
1153                                         __le32 *ref_decap_handle)
1154 {
1155         struct bnxt_tc_info *tc_info = bp->tc_info;
1156         struct bnxt_tc_flow_node *ref_flow_node;
1157         struct bnxt_tc_l2_node *decap_l2_node;
1158
1159         decap_l2_node = bnxt_tc_get_l2_node(bp, &tc_info->decap_l2_table,
1160                                             tc_info->decap_l2_ht_params,
1161                                             l2_key);
1162         if (!decap_l2_node)
1163                 return -1;
1164
1165         /* If any other flow is using this decap_l2_node, use it's decap_handle
1166          * as the ref_decap_handle
1167          */
1168         if (decap_l2_node->refcount > 0) {
1169                 ref_flow_node =
1170                         list_first_entry(&decap_l2_node->common_l2_flows,
1171                                          struct bnxt_tc_flow_node,
1172                                          decap_l2_list_node);
1173                 *ref_decap_handle = ref_flow_node->decap_node->tunnel_handle;
1174         } else {
1175                 *ref_decap_handle = INVALID_TUNNEL_HANDLE;
1176         }
1177
1178         /* Insert the l2_node into the flow_node so that subsequent flows
1179          * with a matching decap l2 key can use the decap_filter_handle of
1180          * this flow as their ref_decap_handle
1181          */
1182         flow_node->decap_l2_node = decap_l2_node;
1183         list_add(&flow_node->decap_l2_list_node,
1184                  &decap_l2_node->common_l2_flows);
1185         decap_l2_node->refcount++;
1186         return 0;
1187 }
1188
1189 static void bnxt_tc_put_decap_l2_node(struct bnxt *bp,
1190                                       struct bnxt_tc_flow_node *flow_node)
1191 {
1192         struct bnxt_tc_l2_node *decap_l2_node = flow_node->decap_l2_node;
1193         struct bnxt_tc_info *tc_info = bp->tc_info;
1194         int rc;
1195
1196         /* remove flow_node from the decap L2 sharing flow list */
1197         list_del(&flow_node->decap_l2_list_node);
1198         if (--decap_l2_node->refcount == 0) {
1199                 rc =  rhashtable_remove_fast(&tc_info->decap_l2_table,
1200                                              &decap_l2_node->node,
1201                                              tc_info->decap_l2_ht_params);
1202                 if (rc)
1203                         netdev_err(bp->dev, "rhashtable_remove_fast rc=%d\n", rc);
1204                 kfree_rcu(decap_l2_node, rcu);
1205         }
1206 }
1207
1208 static void bnxt_tc_put_decap_handle(struct bnxt *bp,
1209                                      struct bnxt_tc_flow_node *flow_node)
1210 {
1211         __le32 decap_handle = flow_node->decap_node->tunnel_handle;
1212         struct bnxt_tc_info *tc_info = bp->tc_info;
1213         int rc;
1214
1215         if (flow_node->decap_l2_node)
1216                 bnxt_tc_put_decap_l2_node(bp, flow_node);
1217
1218         rc = bnxt_tc_put_tunnel_node(bp, &tc_info->decap_table,
1219                                      &tc_info->decap_ht_params,
1220                                      flow_node->decap_node);
1221         if (!rc && decap_handle != INVALID_TUNNEL_HANDLE)
1222                 hwrm_cfa_decap_filter_free(bp, decap_handle);
1223 }
1224
1225 static int bnxt_tc_resolve_tunnel_hdrs(struct bnxt *bp,
1226                                        struct ip_tunnel_key *tun_key,
1227                                        struct bnxt_tc_l2_key *l2_info)
1228 {
1229 #ifdef CONFIG_INET
1230         struct net_device *real_dst_dev = bp->dev;
1231         struct flowi4 flow = { {0} };
1232         struct net_device *dst_dev;
1233         struct neighbour *nbr;
1234         struct rtable *rt;
1235         int rc;
1236
1237         flow.flowi4_proto = IPPROTO_UDP;
1238         flow.fl4_dport = tun_key->tp_dst;
1239         flow.daddr = tun_key->u.ipv4.dst;
1240
1241         rt = ip_route_output_key(dev_net(real_dst_dev), &flow);
1242         if (IS_ERR(rt)) {
1243                 netdev_info(bp->dev, "no route to %pI4b\n", &flow.daddr);
1244                 return -EOPNOTSUPP;
1245         }
1246
1247         /* The route must either point to the real_dst_dev or a dst_dev that
1248          * uses the real_dst_dev.
1249          */
1250         dst_dev = rt->dst.dev;
1251         if (is_vlan_dev(dst_dev)) {
1252 #if IS_ENABLED(CONFIG_VLAN_8021Q)
1253                 struct vlan_dev_priv *vlan = vlan_dev_priv(dst_dev);
1254
1255                 if (vlan->real_dev != real_dst_dev) {
1256                         netdev_info(bp->dev,
1257                                     "dst_dev(%s) doesn't use PF-if(%s)\n",
1258                                     netdev_name(dst_dev),
1259                                     netdev_name(real_dst_dev));
1260                         rc = -EOPNOTSUPP;
1261                         goto put_rt;
1262                 }
1263                 l2_info->inner_vlan_tci = htons(vlan->vlan_id);
1264                 l2_info->inner_vlan_tpid = vlan->vlan_proto;
1265                 l2_info->num_vlans = 1;
1266 #endif
1267         } else if (dst_dev != real_dst_dev) {
1268                 netdev_info(bp->dev,
1269                             "dst_dev(%s) for %pI4b is not PF-if(%s)\n",
1270                             netdev_name(dst_dev), &flow.daddr,
1271                             netdev_name(real_dst_dev));
1272                 rc = -EOPNOTSUPP;
1273                 goto put_rt;
1274         }
1275
1276         nbr = dst_neigh_lookup(&rt->dst, &flow.daddr);
1277         if (!nbr) {
1278                 netdev_info(bp->dev, "can't lookup neighbor for %pI4b\n",
1279                             &flow.daddr);
1280                 rc = -EOPNOTSUPP;
1281                 goto put_rt;
1282         }
1283
1284         tun_key->u.ipv4.src = flow.saddr;
1285         tun_key->ttl = ip4_dst_hoplimit(&rt->dst);
1286         neigh_ha_snapshot(l2_info->dmac, nbr, dst_dev);
1287         ether_addr_copy(l2_info->smac, dst_dev->dev_addr);
1288         neigh_release(nbr);
1289         ip_rt_put(rt);
1290
1291         return 0;
1292 put_rt:
1293         ip_rt_put(rt);
1294         return rc;
1295 #else
1296         return -EOPNOTSUPP;
1297 #endif
1298 }
1299
1300 static int bnxt_tc_get_decap_handle(struct bnxt *bp, struct bnxt_tc_flow *flow,
1301                                     struct bnxt_tc_flow_node *flow_node,
1302                                     __le32 *decap_filter_handle)
1303 {
1304         struct ip_tunnel_key *decap_key = &flow->tun_key;
1305         struct bnxt_tc_info *tc_info = bp->tc_info;
1306         struct bnxt_tc_l2_key l2_info = { {0} };
1307         struct bnxt_tc_tunnel_node *decap_node;
1308         struct ip_tunnel_key tun_key = { 0 };
1309         struct bnxt_tc_l2_key *decap_l2_info;
1310         __le32 ref_decap_handle;
1311         int rc;
1312
1313         /* Check if there's another flow using the same tunnel decap.
1314          * If not, add this tunnel to the table and resolve the other
1315          * tunnel header fileds. Ignore src_port in the tunnel_key,
1316          * since it is not required for decap filters.
1317          */
1318         decap_key->tp_src = 0;
1319         decap_node = bnxt_tc_get_tunnel_node(bp, &tc_info->decap_table,
1320                                              &tc_info->decap_ht_params,
1321                                              decap_key);
1322         if (!decap_node)
1323                 return -ENOMEM;
1324
1325         flow_node->decap_node = decap_node;
1326
1327         if (decap_node->tunnel_handle != INVALID_TUNNEL_HANDLE)
1328                 goto done;
1329
1330         /* Resolve the L2 fields for tunnel decap
1331          * Resolve the route for remote vtep (saddr) of the decap key
1332          * Find it's next-hop mac addrs
1333          */
1334         tun_key.u.ipv4.dst = flow->tun_key.u.ipv4.src;
1335         tun_key.tp_dst = flow->tun_key.tp_dst;
1336         rc = bnxt_tc_resolve_tunnel_hdrs(bp, &tun_key, &l2_info);
1337         if (rc)
1338                 goto put_decap;
1339
1340         decap_l2_info = &decap_node->l2_info;
1341         /* decap smac is wildcarded */
1342         ether_addr_copy(decap_l2_info->dmac, l2_info.smac);
1343         if (l2_info.num_vlans) {
1344                 decap_l2_info->num_vlans = l2_info.num_vlans;
1345                 decap_l2_info->inner_vlan_tpid = l2_info.inner_vlan_tpid;
1346                 decap_l2_info->inner_vlan_tci = l2_info.inner_vlan_tci;
1347         }
1348         flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_ETH_ADDRS;
1349
1350         /* For getting a decap_filter_handle we first need to check if
1351          * there are any other decap flows that share the same tunnel L2
1352          * key and if so, pass that flow's decap_filter_handle as the
1353          * ref_decap_handle for this flow.
1354          */
1355         rc = bnxt_tc_get_ref_decap_handle(bp, flow, decap_l2_info, flow_node,
1356                                           &ref_decap_handle);
1357         if (rc)
1358                 goto put_decap;
1359
1360         /* Issue the hwrm cmd to allocate a decap filter handle */
1361         rc = hwrm_cfa_decap_filter_alloc(bp, flow, decap_l2_info,
1362                                          ref_decap_handle,
1363                                          &decap_node->tunnel_handle);
1364         if (rc)
1365                 goto put_decap_l2;
1366
1367 done:
1368         *decap_filter_handle = decap_node->tunnel_handle;
1369         return 0;
1370
1371 put_decap_l2:
1372         bnxt_tc_put_decap_l2_node(bp, flow_node);
1373 put_decap:
1374         bnxt_tc_put_tunnel_node(bp, &tc_info->decap_table,
1375                                 &tc_info->decap_ht_params,
1376                                 flow_node->decap_node);
1377         return rc;
1378 }
1379
1380 static void bnxt_tc_put_encap_handle(struct bnxt *bp,
1381                                      struct bnxt_tc_tunnel_node *encap_node)
1382 {
1383         __le32 encap_handle = encap_node->tunnel_handle;
1384         struct bnxt_tc_info *tc_info = bp->tc_info;
1385         int rc;
1386
1387         rc = bnxt_tc_put_tunnel_node(bp, &tc_info->encap_table,
1388                                      &tc_info->encap_ht_params, encap_node);
1389         if (!rc && encap_handle != INVALID_TUNNEL_HANDLE)
1390                 hwrm_cfa_encap_record_free(bp, encap_handle);
1391 }
1392
1393 /* Lookup the tunnel encap table and check if there's an encap_handle
1394  * alloc'd already.
1395  * If not, query L2 info via a route lookup and issue an encap_record_alloc
1396  * cmd to FW.
1397  */
1398 static int bnxt_tc_get_encap_handle(struct bnxt *bp, struct bnxt_tc_flow *flow,
1399                                     struct bnxt_tc_flow_node *flow_node,
1400                                     __le32 *encap_handle)
1401 {
1402         struct ip_tunnel_key *encap_key = &flow->actions.tun_encap_key;
1403         struct bnxt_tc_info *tc_info = bp->tc_info;
1404         struct bnxt_tc_tunnel_node *encap_node;
1405         int rc;
1406
1407         /* Check if there's another flow using the same tunnel encap.
1408          * If not, add this tunnel to the table and resolve the other
1409          * tunnel header fileds
1410          */
1411         encap_node = bnxt_tc_get_tunnel_node(bp, &tc_info->encap_table,
1412                                              &tc_info->encap_ht_params,
1413                                              encap_key);
1414         if (!encap_node)
1415                 return -ENOMEM;
1416
1417         flow_node->encap_node = encap_node;
1418
1419         if (encap_node->tunnel_handle != INVALID_TUNNEL_HANDLE)
1420                 goto done;
1421
1422         rc = bnxt_tc_resolve_tunnel_hdrs(bp, encap_key, &encap_node->l2_info);
1423         if (rc)
1424                 goto put_encap;
1425
1426         /* Allocate a new tunnel encap record */
1427         rc = hwrm_cfa_encap_record_alloc(bp, encap_key, &encap_node->l2_info,
1428                                          &encap_node->tunnel_handle);
1429         if (rc)
1430                 goto put_encap;
1431
1432 done:
1433         *encap_handle = encap_node->tunnel_handle;
1434         return 0;
1435
1436 put_encap:
1437         bnxt_tc_put_tunnel_node(bp, &tc_info->encap_table,
1438                                 &tc_info->encap_ht_params, encap_node);
1439         return rc;
1440 }
1441
1442 static void bnxt_tc_put_tunnel_handle(struct bnxt *bp,
1443                                       struct bnxt_tc_flow *flow,
1444                                       struct bnxt_tc_flow_node *flow_node)
1445 {
1446         if (flow->actions.flags & BNXT_TC_ACTION_FLAG_TUNNEL_DECAP)
1447                 bnxt_tc_put_decap_handle(bp, flow_node);
1448         else if (flow->actions.flags & BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP)
1449                 bnxt_tc_put_encap_handle(bp, flow_node->encap_node);
1450 }
1451
1452 static int bnxt_tc_get_tunnel_handle(struct bnxt *bp,
1453                                      struct bnxt_tc_flow *flow,
1454                                      struct bnxt_tc_flow_node *flow_node,
1455                                      __le32 *tunnel_handle)
1456 {
1457         if (flow->actions.flags & BNXT_TC_ACTION_FLAG_TUNNEL_DECAP)
1458                 return bnxt_tc_get_decap_handle(bp, flow, flow_node,
1459                                                 tunnel_handle);
1460         else if (flow->actions.flags & BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP)
1461                 return bnxt_tc_get_encap_handle(bp, flow, flow_node,
1462                                                 tunnel_handle);
1463         else
1464                 return 0;
1465 }
1466 static int __bnxt_tc_del_flow(struct bnxt *bp,
1467                               struct bnxt_tc_flow_node *flow_node)
1468 {
1469         struct bnxt_tc_info *tc_info = bp->tc_info;
1470         int rc;
1471
1472         /* send HWRM cmd to free the flow-id */
1473         bnxt_hwrm_cfa_flow_free(bp, flow_node);
1474
1475         mutex_lock(&tc_info->lock);
1476
1477         /* release references to any tunnel encap/decap nodes */
1478         bnxt_tc_put_tunnel_handle(bp, &flow_node->flow, flow_node);
1479
1480         /* release reference to l2 node */
1481         bnxt_tc_put_l2_node(bp, flow_node);
1482
1483         mutex_unlock(&tc_info->lock);
1484
1485         rc = rhashtable_remove_fast(&tc_info->flow_table, &flow_node->node,
1486                                     tc_info->flow_ht_params);
1487         if (rc)
1488                 netdev_err(bp->dev, "Error: %s: rhashtable_remove_fast rc=%d\n",
1489                            __func__, rc);
1490
1491         kfree_rcu(flow_node, rcu);
1492         return 0;
1493 }
1494
1495 static void bnxt_tc_set_flow_dir(struct bnxt *bp, struct bnxt_tc_flow *flow,
1496                                  u16 src_fid)
1497 {
1498         flow->l2_key.dir = (bp->pf.fw_fid == src_fid) ? BNXT_DIR_RX : BNXT_DIR_TX;
1499 }
1500
1501 static void bnxt_tc_set_src_fid(struct bnxt *bp, struct bnxt_tc_flow *flow,
1502                                 u16 src_fid)
1503 {
1504         if (flow->actions.flags & BNXT_TC_ACTION_FLAG_TUNNEL_DECAP)
1505                 flow->src_fid = bp->pf.fw_fid;
1506         else
1507                 flow->src_fid = src_fid;
1508 }
1509
1510 /* Add a new flow or replace an existing flow.
1511  * Notes on locking:
1512  * There are essentially two critical sections here.
1513  * 1. while adding a new flow
1514  *    a) lookup l2-key
1515  *    b) issue HWRM cmd and get flow_handle
1516  *    c) link l2-key with flow
1517  * 2. while deleting a flow
1518  *    a) unlinking l2-key from flow
1519  * A lock is needed to protect these two critical sections.
1520  *
1521  * The hash-tables are already protected by the rhashtable API.
1522  */
1523 static int bnxt_tc_add_flow(struct bnxt *bp, u16 src_fid,
1524                             struct flow_cls_offload *tc_flow_cmd)
1525 {
1526         struct bnxt_tc_flow_node *new_node, *old_node;
1527         struct bnxt_tc_info *tc_info = bp->tc_info;
1528         struct bnxt_tc_flow *flow;
1529         __le32 tunnel_handle = 0;
1530         __le16 ref_flow_handle;
1531         int rc;
1532
1533         /* allocate memory for the new flow and it's node */
1534         new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
1535         if (!new_node) {
1536                 rc = -ENOMEM;
1537                 goto done;
1538         }
1539         new_node->cookie = tc_flow_cmd->cookie;
1540         flow = &new_node->flow;
1541
1542         rc = bnxt_tc_parse_flow(bp, tc_flow_cmd, flow);
1543         if (rc)
1544                 goto free_node;
1545
1546         bnxt_tc_set_src_fid(bp, flow, src_fid);
1547         bnxt_tc_set_flow_dir(bp, flow, flow->src_fid);
1548
1549         if (!bnxt_tc_can_offload(bp, flow)) {
1550                 rc = -EOPNOTSUPP;
1551                 kfree_rcu(new_node, rcu);
1552                 return rc;
1553         }
1554
1555         /* If a flow exists with the same cookie, delete it */
1556         old_node = rhashtable_lookup_fast(&tc_info->flow_table,
1557                                           &tc_flow_cmd->cookie,
1558                                           tc_info->flow_ht_params);
1559         if (old_node)
1560                 __bnxt_tc_del_flow(bp, old_node);
1561
1562         /* Check if the L2 part of the flow has been offloaded already.
1563          * If so, bump up it's refcnt and get it's reference handle.
1564          */
1565         mutex_lock(&tc_info->lock);
1566         rc = bnxt_tc_get_ref_flow_handle(bp, flow, new_node, &ref_flow_handle);
1567         if (rc)
1568                 goto unlock;
1569
1570         /* If the flow involves tunnel encap/decap, get tunnel_handle */
1571         rc = bnxt_tc_get_tunnel_handle(bp, flow, new_node, &tunnel_handle);
1572         if (rc)
1573                 goto put_l2;
1574
1575         /* send HWRM cmd to alloc the flow */
1576         rc = bnxt_hwrm_cfa_flow_alloc(bp, flow, ref_flow_handle,
1577                                       tunnel_handle, new_node);
1578         if (rc)
1579                 goto put_tunnel;
1580
1581         flow->lastused = jiffies;
1582         spin_lock_init(&flow->stats_lock);
1583         /* add new flow to flow-table */
1584         rc = rhashtable_insert_fast(&tc_info->flow_table, &new_node->node,
1585                                     tc_info->flow_ht_params);
1586         if (rc)
1587                 goto hwrm_flow_free;
1588
1589         mutex_unlock(&tc_info->lock);
1590         return 0;
1591
1592 hwrm_flow_free:
1593         bnxt_hwrm_cfa_flow_free(bp, new_node);
1594 put_tunnel:
1595         bnxt_tc_put_tunnel_handle(bp, flow, new_node);
1596 put_l2:
1597         bnxt_tc_put_l2_node(bp, new_node);
1598 unlock:
1599         mutex_unlock(&tc_info->lock);
1600 free_node:
1601         kfree_rcu(new_node, rcu);
1602 done:
1603         netdev_err(bp->dev, "Error: %s: cookie=0x%lx error=%d\n",
1604                    __func__, tc_flow_cmd->cookie, rc);
1605         return rc;
1606 }
1607
1608 static int bnxt_tc_del_flow(struct bnxt *bp,
1609                             struct flow_cls_offload *tc_flow_cmd)
1610 {
1611         struct bnxt_tc_info *tc_info = bp->tc_info;
1612         struct bnxt_tc_flow_node *flow_node;
1613
1614         flow_node = rhashtable_lookup_fast(&tc_info->flow_table,
1615                                            &tc_flow_cmd->cookie,
1616                                            tc_info->flow_ht_params);
1617         if (!flow_node)
1618                 return -EINVAL;
1619
1620         return __bnxt_tc_del_flow(bp, flow_node);
1621 }
1622
1623 static int bnxt_tc_get_flow_stats(struct bnxt *bp,
1624                                   struct flow_cls_offload *tc_flow_cmd)
1625 {
1626         struct bnxt_tc_flow_stats stats, *curr_stats, *prev_stats;
1627         struct bnxt_tc_info *tc_info = bp->tc_info;
1628         struct bnxt_tc_flow_node *flow_node;
1629         struct bnxt_tc_flow *flow;
1630         unsigned long lastused;
1631
1632         flow_node = rhashtable_lookup_fast(&tc_info->flow_table,
1633                                            &tc_flow_cmd->cookie,
1634                                            tc_info->flow_ht_params);
1635         if (!flow_node)
1636                 return -1;
1637
1638         flow = &flow_node->flow;
1639         curr_stats = &flow->stats;
1640         prev_stats = &flow->prev_stats;
1641
1642         spin_lock(&flow->stats_lock);
1643         stats.packets = curr_stats->packets - prev_stats->packets;
1644         stats.bytes = curr_stats->bytes - prev_stats->bytes;
1645         *prev_stats = *curr_stats;
1646         lastused = flow->lastused;
1647         spin_unlock(&flow->stats_lock);
1648
1649         flow_stats_update(&tc_flow_cmd->stats, stats.bytes, stats.packets, 0,
1650                           lastused, FLOW_ACTION_HW_STATS_DELAYED);
1651         return 0;
1652 }
1653
1654 static void bnxt_fill_cfa_stats_req(struct bnxt *bp,
1655                                     struct bnxt_tc_flow_node *flow_node,
1656                                     __le16 *flow_handle, __le32 *flow_id)
1657 {
1658         u16 handle;
1659
1660         if (bp->fw_cap & BNXT_FW_CAP_OVS_64BIT_HANDLE) {
1661                 *flow_id = flow_node->flow_id;
1662
1663                 /* If flow_id is used to fetch flow stats then:
1664                  * 1. lower 12 bits of flow_handle must be set to all 1s.
1665                  * 2. 15th bit of flow_handle must specify the flow
1666                  *    direction (TX/RX).
1667                  */
1668                 if (flow_node->flow.l2_key.dir == BNXT_DIR_RX)
1669                         handle = CFA_FLOW_INFO_REQ_FLOW_HANDLE_DIR_RX |
1670                                  CFA_FLOW_INFO_REQ_FLOW_HANDLE_MAX_MASK;
1671                 else
1672                         handle = CFA_FLOW_INFO_REQ_FLOW_HANDLE_MAX_MASK;
1673
1674                 *flow_handle = cpu_to_le16(handle);
1675         } else {
1676                 *flow_handle = flow_node->flow_handle;
1677         }
1678 }
1679
1680 static int
1681 bnxt_hwrm_cfa_flow_stats_get(struct bnxt *bp, int num_flows,
1682                              struct bnxt_tc_stats_batch stats_batch[])
1683 {
1684         struct hwrm_cfa_flow_stats_output *resp;
1685         struct hwrm_cfa_flow_stats_input *req;
1686         __le16 *req_flow_handles;
1687         __le32 *req_flow_ids;
1688         int rc, i;
1689
1690         rc = hwrm_req_init(bp, req, HWRM_CFA_FLOW_STATS);
1691         if (rc)
1692                 goto exit;
1693
1694         req_flow_handles = &req->flow_handle_0;
1695         req_flow_ids = &req->flow_id_0;
1696
1697         req->num_flows = cpu_to_le16(num_flows);
1698         for (i = 0; i < num_flows; i++) {
1699                 struct bnxt_tc_flow_node *flow_node = stats_batch[i].flow_node;
1700
1701                 bnxt_fill_cfa_stats_req(bp, flow_node,
1702                                         &req_flow_handles[i], &req_flow_ids[i]);
1703         }
1704
1705         resp = hwrm_req_hold(bp, req);
1706         rc = hwrm_req_send(bp, req);
1707         if (!rc) {
1708                 __le64 *resp_packets;
1709                 __le64 *resp_bytes;
1710
1711                 resp_packets = &resp->packet_0;
1712                 resp_bytes = &resp->byte_0;
1713
1714                 for (i = 0; i < num_flows; i++) {
1715                         stats_batch[i].hw_stats.packets =
1716                                                 le64_to_cpu(resp_packets[i]);
1717                         stats_batch[i].hw_stats.bytes =
1718                                                 le64_to_cpu(resp_bytes[i]);
1719                 }
1720         }
1721         hwrm_req_drop(bp, req);
1722 exit:
1723         if (rc)
1724                 netdev_info(bp->dev, "error rc=%d\n", rc);
1725
1726         return rc;
1727 }
1728
1729 /* Add val to accum while handling a possible wraparound
1730  * of val. Eventhough val is of type u64, its actual width
1731  * is denoted by mask and will wrap-around beyond that width.
1732  */
1733 static void accumulate_val(u64 *accum, u64 val, u64 mask)
1734 {
1735 #define low_bits(x, mask)               ((x) & (mask))
1736 #define high_bits(x, mask)              ((x) & ~(mask))
1737         bool wrapped = val < low_bits(*accum, mask);
1738
1739         *accum = high_bits(*accum, mask) + val;
1740         if (wrapped)
1741                 *accum += (mask + 1);
1742 }
1743
1744 /* The HW counters' width is much less than 64bits.
1745  * Handle possible wrap-around while updating the stat counters
1746  */
1747 static void bnxt_flow_stats_accum(struct bnxt_tc_info *tc_info,
1748                                   struct bnxt_tc_flow_stats *acc_stats,
1749                                   struct bnxt_tc_flow_stats *hw_stats)
1750 {
1751         accumulate_val(&acc_stats->bytes, hw_stats->bytes, tc_info->bytes_mask);
1752         accumulate_val(&acc_stats->packets, hw_stats->packets,
1753                        tc_info->packets_mask);
1754 }
1755
1756 static int
1757 bnxt_tc_flow_stats_batch_update(struct bnxt *bp, int num_flows,
1758                                 struct bnxt_tc_stats_batch stats_batch[])
1759 {
1760         struct bnxt_tc_info *tc_info = bp->tc_info;
1761         int rc, i;
1762
1763         rc = bnxt_hwrm_cfa_flow_stats_get(bp, num_flows, stats_batch);
1764         if (rc)
1765                 return rc;
1766
1767         for (i = 0; i < num_flows; i++) {
1768                 struct bnxt_tc_flow_node *flow_node = stats_batch[i].flow_node;
1769                 struct bnxt_tc_flow *flow = &flow_node->flow;
1770
1771                 spin_lock(&flow->stats_lock);
1772                 bnxt_flow_stats_accum(tc_info, &flow->stats,
1773                                       &stats_batch[i].hw_stats);
1774                 if (flow->stats.packets != flow->prev_stats.packets)
1775                         flow->lastused = jiffies;
1776                 spin_unlock(&flow->stats_lock);
1777         }
1778
1779         return 0;
1780 }
1781
1782 static int
1783 bnxt_tc_flow_stats_batch_prep(struct bnxt *bp,
1784                               struct bnxt_tc_stats_batch stats_batch[],
1785                               int *num_flows)
1786 {
1787         struct bnxt_tc_info *tc_info = bp->tc_info;
1788         struct rhashtable_iter *iter = &tc_info->iter;
1789         void *flow_node;
1790         int rc, i;
1791
1792         rhashtable_walk_start(iter);
1793
1794         rc = 0;
1795         for (i = 0; i < BNXT_FLOW_STATS_BATCH_MAX; i++) {
1796                 flow_node = rhashtable_walk_next(iter);
1797                 if (IS_ERR(flow_node)) {
1798                         i = 0;
1799                         if (PTR_ERR(flow_node) == -EAGAIN) {
1800                                 continue;
1801                         } else {
1802                                 rc = PTR_ERR(flow_node);
1803                                 goto done;
1804                         }
1805                 }
1806
1807                 /* No more flows */
1808                 if (!flow_node)
1809                         goto done;
1810
1811                 stats_batch[i].flow_node = flow_node;
1812         }
1813 done:
1814         rhashtable_walk_stop(iter);
1815         *num_flows = i;
1816         return rc;
1817 }
1818
1819 void bnxt_tc_flow_stats_work(struct bnxt *bp)
1820 {
1821         struct bnxt_tc_info *tc_info = bp->tc_info;
1822         int num_flows, rc;
1823
1824         num_flows = atomic_read(&tc_info->flow_table.nelems);
1825         if (!num_flows)
1826                 return;
1827
1828         rhashtable_walk_enter(&tc_info->flow_table, &tc_info->iter);
1829
1830         for (;;) {
1831                 rc = bnxt_tc_flow_stats_batch_prep(bp, tc_info->stats_batch,
1832                                                    &num_flows);
1833                 if (rc) {
1834                         if (rc == -EAGAIN)
1835                                 continue;
1836                         break;
1837                 }
1838
1839                 if (!num_flows)
1840                         break;
1841
1842                 bnxt_tc_flow_stats_batch_update(bp, num_flows,
1843                                                 tc_info->stats_batch);
1844         }
1845
1846         rhashtable_walk_exit(&tc_info->iter);
1847 }
1848
1849 int bnxt_tc_setup_flower(struct bnxt *bp, u16 src_fid,
1850                          struct flow_cls_offload *cls_flower)
1851 {
1852         switch (cls_flower->command) {
1853         case FLOW_CLS_REPLACE:
1854                 return bnxt_tc_add_flow(bp, src_fid, cls_flower);
1855         case FLOW_CLS_DESTROY:
1856                 return bnxt_tc_del_flow(bp, cls_flower);
1857         case FLOW_CLS_STATS:
1858                 return bnxt_tc_get_flow_stats(bp, cls_flower);
1859         default:
1860                 return -EOPNOTSUPP;
1861         }
1862 }
1863
1864 static int bnxt_tc_setup_indr_block_cb(enum tc_setup_type type,
1865                                        void *type_data, void *cb_priv)
1866 {
1867         struct bnxt_flower_indr_block_cb_priv *priv = cb_priv;
1868         struct flow_cls_offload *flower = type_data;
1869         struct bnxt *bp = priv->bp;
1870
1871         if (flower->common.chain_index)
1872                 return -EOPNOTSUPP;
1873
1874         switch (type) {
1875         case TC_SETUP_CLSFLOWER:
1876                 return bnxt_tc_setup_flower(bp, bp->pf.fw_fid, flower);
1877         default:
1878                 return -EOPNOTSUPP;
1879         }
1880 }
1881
1882 static struct bnxt_flower_indr_block_cb_priv *
1883 bnxt_tc_indr_block_cb_lookup(struct bnxt *bp, struct net_device *netdev)
1884 {
1885         struct bnxt_flower_indr_block_cb_priv *cb_priv;
1886
1887         /* All callback list access should be protected by RTNL. */
1888         ASSERT_RTNL();
1889
1890         list_for_each_entry(cb_priv, &bp->tc_indr_block_list, list)
1891                 if (cb_priv->tunnel_netdev == netdev)
1892                         return cb_priv;
1893
1894         return NULL;
1895 }
1896
1897 static void bnxt_tc_setup_indr_rel(void *cb_priv)
1898 {
1899         struct bnxt_flower_indr_block_cb_priv *priv = cb_priv;
1900
1901         list_del(&priv->list);
1902         kfree(priv);
1903 }
1904
1905 static int bnxt_tc_setup_indr_block(struct net_device *netdev, struct Qdisc *sch, struct bnxt *bp,
1906                                     struct flow_block_offload *f, void *data,
1907                                     void (*cleanup)(struct flow_block_cb *block_cb))
1908 {
1909         struct bnxt_flower_indr_block_cb_priv *cb_priv;
1910         struct flow_block_cb *block_cb;
1911
1912         if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1913                 return -EOPNOTSUPP;
1914
1915         switch (f->command) {
1916         case FLOW_BLOCK_BIND:
1917                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
1918                 if (!cb_priv)
1919                         return -ENOMEM;
1920
1921                 cb_priv->tunnel_netdev = netdev;
1922                 cb_priv->bp = bp;
1923                 list_add(&cb_priv->list, &bp->tc_indr_block_list);
1924
1925                 block_cb = flow_indr_block_cb_alloc(bnxt_tc_setup_indr_block_cb,
1926                                                     cb_priv, cb_priv,
1927                                                     bnxt_tc_setup_indr_rel, f,
1928                                                     netdev, sch, data, bp, cleanup);
1929                 if (IS_ERR(block_cb)) {
1930                         list_del(&cb_priv->list);
1931                         kfree(cb_priv);
1932                         return PTR_ERR(block_cb);
1933                 }
1934
1935                 flow_block_cb_add(block_cb, f);
1936                 list_add_tail(&block_cb->driver_list, &bnxt_block_cb_list);
1937                 break;
1938         case FLOW_BLOCK_UNBIND:
1939                 cb_priv = bnxt_tc_indr_block_cb_lookup(bp, netdev);
1940                 if (!cb_priv)
1941                         return -ENOENT;
1942
1943                 block_cb = flow_block_cb_lookup(f->block,
1944                                                 bnxt_tc_setup_indr_block_cb,
1945                                                 cb_priv);
1946                 if (!block_cb)
1947                         return -ENOENT;
1948
1949                 flow_indr_block_cb_remove(block_cb, f);
1950                 list_del(&block_cb->driver_list);
1951                 break;
1952         default:
1953                 return -EOPNOTSUPP;
1954         }
1955         return 0;
1956 }
1957
1958 static bool bnxt_is_netdev_indr_offload(struct net_device *netdev)
1959 {
1960         return netif_is_vxlan(netdev);
1961 }
1962
1963 static int bnxt_tc_setup_indr_cb(struct net_device *netdev, struct Qdisc *sch, void *cb_priv,
1964                                  enum tc_setup_type type, void *type_data,
1965                                  void *data,
1966                                  void (*cleanup)(struct flow_block_cb *block_cb))
1967 {
1968         if (!bnxt_is_netdev_indr_offload(netdev))
1969                 return -EOPNOTSUPP;
1970
1971         switch (type) {
1972         case TC_SETUP_BLOCK:
1973                 return bnxt_tc_setup_indr_block(netdev, sch, cb_priv, type_data, data, cleanup);
1974         default:
1975                 break;
1976         }
1977
1978         return -EOPNOTSUPP;
1979 }
1980
1981 static const struct rhashtable_params bnxt_tc_flow_ht_params = {
1982         .head_offset = offsetof(struct bnxt_tc_flow_node, node),
1983         .key_offset = offsetof(struct bnxt_tc_flow_node, cookie),
1984         .key_len = sizeof(((struct bnxt_tc_flow_node *)0)->cookie),
1985         .automatic_shrinking = true
1986 };
1987
1988 static const struct rhashtable_params bnxt_tc_l2_ht_params = {
1989         .head_offset = offsetof(struct bnxt_tc_l2_node, node),
1990         .key_offset = offsetof(struct bnxt_tc_l2_node, key),
1991         .key_len = BNXT_TC_L2_KEY_LEN,
1992         .automatic_shrinking = true
1993 };
1994
1995 static const struct rhashtable_params bnxt_tc_decap_l2_ht_params = {
1996         .head_offset = offsetof(struct bnxt_tc_l2_node, node),
1997         .key_offset = offsetof(struct bnxt_tc_l2_node, key),
1998         .key_len = BNXT_TC_L2_KEY_LEN,
1999         .automatic_shrinking = true
2000 };
2001
2002 static const struct rhashtable_params bnxt_tc_tunnel_ht_params = {
2003         .head_offset = offsetof(struct bnxt_tc_tunnel_node, node),
2004         .key_offset = offsetof(struct bnxt_tc_tunnel_node, key),
2005         .key_len = sizeof(struct ip_tunnel_key),
2006         .automatic_shrinking = true
2007 };
2008
2009 /* convert counter width in bits to a mask */
2010 #define mask(width)             ((u64)~0 >> (64 - (width)))
2011
2012 int bnxt_init_tc(struct bnxt *bp)
2013 {
2014         struct bnxt_tc_info *tc_info;
2015         int rc;
2016
2017         if (bp->hwrm_spec_code < 0x10803)
2018                 return 0;
2019
2020         tc_info = kzalloc(sizeof(*tc_info), GFP_KERNEL);
2021         if (!tc_info)
2022                 return -ENOMEM;
2023         mutex_init(&tc_info->lock);
2024
2025         /* Counter widths are programmed by FW */
2026         tc_info->bytes_mask = mask(36);
2027         tc_info->packets_mask = mask(28);
2028
2029         tc_info->flow_ht_params = bnxt_tc_flow_ht_params;
2030         rc = rhashtable_init(&tc_info->flow_table, &tc_info->flow_ht_params);
2031         if (rc)
2032                 goto free_tc_info;
2033
2034         tc_info->l2_ht_params = bnxt_tc_l2_ht_params;
2035         rc = rhashtable_init(&tc_info->l2_table, &tc_info->l2_ht_params);
2036         if (rc)
2037                 goto destroy_flow_table;
2038
2039         tc_info->decap_l2_ht_params = bnxt_tc_decap_l2_ht_params;
2040         rc = rhashtable_init(&tc_info->decap_l2_table,
2041                              &tc_info->decap_l2_ht_params);
2042         if (rc)
2043                 goto destroy_l2_table;
2044
2045         tc_info->decap_ht_params = bnxt_tc_tunnel_ht_params;
2046         rc = rhashtable_init(&tc_info->decap_table,
2047                              &tc_info->decap_ht_params);
2048         if (rc)
2049                 goto destroy_decap_l2_table;
2050
2051         tc_info->encap_ht_params = bnxt_tc_tunnel_ht_params;
2052         rc = rhashtable_init(&tc_info->encap_table,
2053                              &tc_info->encap_ht_params);
2054         if (rc)
2055                 goto destroy_decap_table;
2056
2057         tc_info->enabled = true;
2058         bp->dev->hw_features |= NETIF_F_HW_TC;
2059         bp->dev->features |= NETIF_F_HW_TC;
2060         bp->tc_info = tc_info;
2061
2062         /* init indirect block notifications */
2063         INIT_LIST_HEAD(&bp->tc_indr_block_list);
2064
2065         rc = flow_indr_dev_register(bnxt_tc_setup_indr_cb, bp);
2066         if (!rc)
2067                 return 0;
2068
2069         rhashtable_destroy(&tc_info->encap_table);
2070
2071 destroy_decap_table:
2072         rhashtable_destroy(&tc_info->decap_table);
2073 destroy_decap_l2_table:
2074         rhashtable_destroy(&tc_info->decap_l2_table);
2075 destroy_l2_table:
2076         rhashtable_destroy(&tc_info->l2_table);
2077 destroy_flow_table:
2078         rhashtable_destroy(&tc_info->flow_table);
2079 free_tc_info:
2080         kfree(tc_info);
2081         return rc;
2082 }
2083
2084 void bnxt_shutdown_tc(struct bnxt *bp)
2085 {
2086         struct bnxt_tc_info *tc_info = bp->tc_info;
2087
2088         if (!bnxt_tc_flower_enabled(bp))
2089                 return;
2090
2091         flow_indr_dev_unregister(bnxt_tc_setup_indr_cb, bp,
2092                                  bnxt_tc_setup_indr_rel);
2093         rhashtable_destroy(&tc_info->flow_table);
2094         rhashtable_destroy(&tc_info->l2_table);
2095         rhashtable_destroy(&tc_info->decap_l2_table);
2096         rhashtable_destroy(&tc_info->decap_table);
2097         rhashtable_destroy(&tc_info->encap_table);
2098         kfree(tc_info);
2099         bp->tc_info = NULL;
2100 }