drivers/net/ethernet/netronome/nfp/flower/offload.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
   3
   4 #include <linux/skbuff.h>
   5 #include <net/devlink.h>
   6 #include <net/pkt_cls.h>
   7
   8 #include "cmsg.h"
   9 #include "main.h"
  10 #include "../nfpcore/nfp_cpp.h"
  11 #include "../nfpcore/nfp_nsp.h"
  12 #include "../nfp_app.h"
  13 #include "../nfp_main.h"
  14 #include "../nfp_net.h"
  15 #include "../nfp_port.h"
  16
  17 #define NFP_FLOWER_SUPPORTED_TCPFLAGS \
  18         (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | \
  19          TCPHDR_PSH | TCPHDR_URG)
  20
  21 #define NFP_FLOWER_SUPPORTED_CTLFLAGS \
  22         (FLOW_DIS_IS_FRAGMENT | \
  23          FLOW_DIS_FIRST_FRAG)
  24
  25 #define NFP_FLOWER_WHITELIST_DISSECTOR \
  26         (BIT(FLOW_DISSECTOR_KEY_CONTROL) | \
  27          BIT(FLOW_DISSECTOR_KEY_BASIC) | \
  28          BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) | \
  29          BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) | \
  30          BIT(FLOW_DISSECTOR_KEY_TCP) | \
  31          BIT(FLOW_DISSECTOR_KEY_PORTS) | \
  32          BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) | \
  33          BIT(FLOW_DISSECTOR_KEY_VLAN) | \
  34          BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  35          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  36          BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  37          BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  38          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
  39          BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
  40          BIT(FLOW_DISSECTOR_KEY_ENC_IP) | \
  41          BIT(FLOW_DISSECTOR_KEY_MPLS) | \
  42          BIT(FLOW_DISSECTOR_KEY_IP))
  43
  44 #define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
  45         (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  46          BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  47          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  48          BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  49          BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
  50          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
  51          BIT(FLOW_DISSECTOR_KEY_ENC_IP))
  52
  53 #define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
  54         (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  55          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  56          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  57
  58 #define NFP_FLOWER_MERGE_FIELDS \
  59         (NFP_FLOWER_LAYER_PORT | \
  60          NFP_FLOWER_LAYER_MAC | \
  61          NFP_FLOWER_LAYER_TP | \
  62          NFP_FLOWER_LAYER_IPV4 | \
  63          NFP_FLOWER_LAYER_IPV6)
  64
  65 struct nfp_flower_merge_check {
  66         union {
  67                 struct {
  68                         __be16 tci;
  69                         struct nfp_flower_mac_mpls l2;
  70                         struct nfp_flower_tp_ports l4;
  71                         union {
  72                                 struct nfp_flower_ipv4 ipv4;
  73                                 struct nfp_flower_ipv6 ipv6;
  74                         };
  75                 };
  76                 unsigned long vals[8];
  77         };
  78 };
  79
  80 static int
  81 nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
  82                      u8 mtype)
  83 {
  84         u32 meta_len, key_len, mask_len, act_len, tot_len;
  85         struct sk_buff *skb;
  86         unsigned char *msg;
  87
  88         meta_len =  sizeof(struct nfp_fl_rule_metadata);
  89         key_len = nfp_flow->meta.key_len;
  90         mask_len = nfp_flow->meta.mask_len;
  91         act_len = nfp_flow->meta.act_len;
  92
  93         tot_len = meta_len + key_len + mask_len + act_len;
  94
  95         /* Convert to long words as firmware expects
  96          * lengths in units of NFP_FL_LW_SIZ.
  97          */
  98         nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
  99         nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
 100         nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;
 101
 102         skb = nfp_flower_cmsg_alloc(app, tot_len, mtype, GFP_KERNEL);
 103         if (!skb)
 104                 return -ENOMEM;
 105
 106         msg = nfp_flower_cmsg_get_data(skb);
 107         memcpy(msg, &nfp_flow->meta, meta_len);
 108         memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
 109         memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
 110         memcpy(&msg[meta_len + key_len + mask_len],
 111                nfp_flow->action_data, act_len);
 112
 113         /* Convert back to bytes as software expects
 114          * lengths in units of bytes.
 115          */
 116         nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
 117         nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
 118         nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
 119
 120         nfp_ctrl_tx(app->ctrl, skb);
 121
 122         return 0;
 123 }
 124
 125 static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
 126 {
 127         struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
 128
 129         return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 130                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 131                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 132                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 133 }
 134
 135 static bool nfp_flower_check_higher_than_l3(struct tc_cls_flower_offload *f)
 136 {
 137         struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
 138
 139         return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 140                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 141 }
 142
 143 static int
 144 nfp_flower_calc_opt_layer(struct flow_match_enc_opts *enc_opts,
 145                           u32 *key_layer_two, int *key_size,
 146                           struct netlink_ext_ack *extack)
 147 {
 148         if (enc_opts->key->len > NFP_FL_MAX_GENEVE_OPT_KEY) {
 149                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: geneve options exceed maximum length");
 150                 return -EOPNOTSUPP;
 151         }
 152
 153         if (enc_opts->key->len > 0) {
 154                 *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 155                 *key_size += sizeof(struct nfp_flower_geneve_options);
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int
 162 nfp_flower_calculate_key_layers(struct nfp_app *app,
 163                                 struct net_device *netdev,
 164                                 struct nfp_fl_key_ls *ret_key_ls,
 165                                 struct tc_cls_flower_offload *flow,
 166                                 enum nfp_flower_tun_type *tun_type,
 167                                 struct netlink_ext_ack *extack)
 168 {
 169         struct flow_rule *rule = tc_cls_flower_offload_flow_rule(flow);
 170         struct flow_dissector *dissector = rule->match.dissector;
 171         struct flow_match_basic basic = { NULL, NULL};
 172         struct nfp_flower_priv *priv = app->priv;
 173         u32 key_layer_two;
 174         u8 key_layer;
 175         int key_size;
 176         int err;
 177
 178         if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR) {
 179                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match not supported");
 180                 return -EOPNOTSUPP;
 181         }
 182
 183         /* If any tun dissector is used then the required set must be used. */
 184         if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 185             (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 186             != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R) {
 187                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel match not supported");
 188                 return -EOPNOTSUPP;
 189         }
 190
 191         key_layer_two = 0;
 192         key_layer = NFP_FLOWER_LAYER_PORT;
 193         key_size = sizeof(struct nfp_flower_meta_tci) +
 194                    sizeof(struct nfp_flower_in_port);
 195
 196         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 197             flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
 198                 key_layer |= NFP_FLOWER_LAYER_MAC;
 199                 key_size += sizeof(struct nfp_flower_mac_mpls);
 200         }
 201
 202         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
 203                 struct flow_match_vlan vlan;
 204
 205                 flow_rule_match_vlan(rule, &vlan);
 206                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 207                     vlan.key->vlan_priority) {
 208                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN PCP offload");
 209                         return -EOPNOTSUPP;
 210                 }
 211         }
 212
 213         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 214                 struct flow_match_enc_opts enc_op = { NULL, NULL };
 215                 struct flow_match_ipv4_addrs ipv4_addrs;
 216                 struct flow_match_control enc_ctl;
 217                 struct flow_match_ports enc_ports;
 218
 219                 flow_rule_match_enc_control(rule, &enc_ctl);
 220
 221                 if (enc_ctl.mask->addr_type != 0xffff) {
 222                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: wildcarded protocols on tunnels are not supported");
 223                         return -EOPNOTSUPP;
 224                 }
 225                 if (enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
 226                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only IPv4 tunnels are supported");
 227                         return -EOPNOTSUPP;
 228                 }
 229
 230                 /* These fields are already verified as used. */
 231                 flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
 232                 if (ipv4_addrs.mask->dst != cpu_to_be32(~0)) {
 233                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv4 destination address is supported");
 234                         return -EOPNOTSUPP;
 235                 }
 236
 237                 flow_rule_match_enc_ports(rule, &enc_ports);
 238                 if (enc_ports.mask->dst != cpu_to_be16(~0)) {
 239                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match L4 destination port is supported");
 240                         return -EOPNOTSUPP;
 241                 }
 242
 243                 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
 244                         flow_rule_match_enc_opts(rule, &enc_op);
 245
 246                 switch (enc_ports.key->dst) {
 247                 case htons(IANA_VXLAN_UDP_PORT):
 248                         *tun_type = NFP_FL_TUNNEL_VXLAN;
 249                         key_layer |= NFP_FLOWER_LAYER_VXLAN;
 250                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 251
 252                         if (enc_op.key) {
 253                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on vxlan tunnels");
 254                                 return -EOPNOTSUPP;
 255                         }
 256                         break;
 257                 case htons(GENEVE_UDP_PORT):
 258                         if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE)) {
 259                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve offload");
 260                                 return -EOPNOTSUPP;
 261                         }
 262                         *tun_type = NFP_FL_TUNNEL_GENEVE;
 263                         key_layer |= NFP_FLOWER_LAYER_EXT_META;
 264                         key_size += sizeof(struct nfp_flower_ext_meta);
 265                         key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 266                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 267
 268                         if (!enc_op.key)
 269                                 break;
 270                         if (!(priv->flower_ext_feats &
 271                               NFP_FL_FEATS_GENEVE_OPT)) {
 272                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve option offload");
 273                                 return -EOPNOTSUPP;
 274                         }
 275                         err = nfp_flower_calc_opt_layer(&enc_op, &key_layer_two,
 276                                                         &key_size, extack);
 277                         if (err)
 278                                 return err;
 279                         break;
 280                 default:
 281                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel type unknown");
 282                         return -EOPNOTSUPP;
 283                 }
 284
 285                 /* Ensure the ingress netdev matches the expected tun type. */
 286                 if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type)) {
 287                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ingress netdev does not match the expected tunnel type");
 288                         return -EOPNOTSUPP;
 289                 }
 290         }
 291
 292         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
 293                 flow_rule_match_basic(rule, &basic);
 294
 295         if (basic.mask && basic.mask->n_proto) {
 296                 /* Ethernet type is present in the key. */
 297                 switch (basic.key->n_proto) {
 298                 case cpu_to_be16(ETH_P_IP):
 299                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 300                         key_size += sizeof(struct nfp_flower_ipv4);
 301                         break;
 302
 303                 case cpu_to_be16(ETH_P_IPV6):
 304                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 305                         key_size += sizeof(struct nfp_flower_ipv6);
 306                         break;
 307
 308                 /* Currently we do not offload ARP
 309                  * because we rely on it to get to the host.
 310                  */
 311                 case cpu_to_be16(ETH_P_ARP):
 312                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ARP not supported");
 313                         return -EOPNOTSUPP;
 314
 315                 case cpu_to_be16(ETH_P_MPLS_UC):
 316                 case cpu_to_be16(ETH_P_MPLS_MC):
 317                         if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 318                                 key_layer |= NFP_FLOWER_LAYER_MAC;
 319                                 key_size += sizeof(struct nfp_flower_mac_mpls);
 320                         }
 321                         break;
 322
 323                 /* Will be included in layer 2. */
 324                 case cpu_to_be16(ETH_P_8021Q):
 325                         break;
 326
 327                 default:
 328                         /* Other ethtype - we need check the masks for the
 329                          * remainder of the key to ensure we can offload.
 330                          */
 331                         if (nfp_flower_check_higher_than_mac(flow)) {
 332                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: non IPv4/IPv6 offload with L3/L4 matches not supported");
 333                                 return -EOPNOTSUPP;
 334                         }
 335                         break;
 336                 }
 337         }
 338
 339         if (basic.mask && basic.mask->ip_proto) {
 340                 switch (basic.key->ip_proto) {
 341                 case IPPROTO_TCP:
 342                 case IPPROTO_UDP:
 343                 case IPPROTO_SCTP:
 344                 case IPPROTO_ICMP:
 345                 case IPPROTO_ICMPV6:
 346                         key_layer |= NFP_FLOWER_LAYER_TP;
 347                         key_size += sizeof(struct nfp_flower_tp_ports);
 348                         break;
 349                 default:
 350                         /* Other ip proto - we need check the masks for the
 351                          * remainder of the key to ensure we can offload.
 352                          */
 353                         if (nfp_flower_check_higher_than_l3(flow)) {
 354                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: unknown IP protocol with L4 matches not supported");
 355                                 return -EOPNOTSUPP;
 356                         }
 357                         break;
 358                 }
 359         }
 360
 361         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
 362                 struct flow_match_tcp tcp;
 363                 u32 tcp_flags;
 364
 365                 flow_rule_match_tcp(rule, &tcp);
 366                 tcp_flags = be16_to_cpu(tcp.key->flags);
 367
 368                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS) {
 369                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: no match support for selected TCP flags");
 370                         return -EOPNOTSUPP;
 371                 }
 372
 373                 /* We only support PSH and URG flags when either
 374                  * FIN, SYN or RST is present as well.
 375                  */
 376                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 377                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST))) {
 378                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: PSH and URG is only supported when used with FIN, SYN or RST");
 379                         return -EOPNOTSUPP;
 380                 }
 381
 382                 /* We need to store TCP flags in the either the IPv4 or IPv6 key
 383                  * space, thus we need to ensure we include a IPv4/IPv6 key
 384                  * layer if we have not done so already.
 385                  */
 386                 if (!basic.key) {
 387                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on L3 protocol");
 388                         return -EOPNOTSUPP;
 389                 }
 390
 391                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 392                     !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
 393                         switch (basic.key->n_proto) {
 394                         case cpu_to_be16(ETH_P_IP):
 395                                 key_layer |= NFP_FLOWER_LAYER_IPV4;
 396                                 key_size += sizeof(struct nfp_flower_ipv4);
 397                                 break;
 398
 399                         case cpu_to_be16(ETH_P_IPV6):
 400                                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 401                                 key_size += sizeof(struct nfp_flower_ipv6);
 402                                 break;
 403
 404                         default:
 405                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on IPv4/IPv6");
 406                                 return -EOPNOTSUPP;
 407                         }
 408                 }
 409         }
 410
 411         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 412                 struct flow_match_control ctl;
 413
 414                 flow_rule_match_control(rule, &ctl);
 415                 if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS) {
 416                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on unknown control flag");
 417                         return -EOPNOTSUPP;
 418                 }
 419         }
 420
 421         ret_key_ls->key_layer = key_layer;
 422         ret_key_ls->key_layer_two = key_layer_two;
 423         ret_key_ls->key_size = key_size;
 424
 425         return 0;
 426 }
 427
 428 static struct nfp_fl_payload *
 429 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 430 {
 431         struct nfp_fl_payload *flow_pay;
 432
 433         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 434         if (!flow_pay)
 435                 return NULL;
 436
 437         flow_pay->meta.key_len = key_layer->key_size;
 438         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 439         if (!flow_pay->unmasked_data)
 440                 goto err_free_flow;
 441
 442         flow_pay->meta.mask_len = key_layer->key_size;
 443         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 444         if (!flow_pay->mask_data)
 445                 goto err_free_unmasked;
 446
 447         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 448         if (!flow_pay->action_data)
 449                 goto err_free_mask;
 450
 451         flow_pay->nfp_tun_ipv4_addr = 0;
 452         flow_pay->meta.flags = 0;
 453         INIT_LIST_HEAD(&flow_pay->linked_flows);
 454         flow_pay->in_hw = false;
 455
 456         return flow_pay;
 457
 458 err_free_mask:
 459         kfree(flow_pay->mask_data);
 460 err_free_unmasked:
 461         kfree(flow_pay->unmasked_data);
 462 err_free_flow:
 463         kfree(flow_pay);
 464         return NULL;
 465 }
 466
 467 static int
 468 nfp_flower_update_merge_with_actions(struct nfp_fl_payload *flow,
 469                                      struct nfp_flower_merge_check *merge,
 470                                      u8 *last_act_id, int *act_out)
 471 {
 472         struct nfp_fl_set_ipv6_tc_hl_fl *ipv6_tc_hl_fl;
 473         struct nfp_fl_set_ip4_ttl_tos *ipv4_ttl_tos;
 474         struct nfp_fl_set_ip4_addrs *ipv4_add;
 475         struct nfp_fl_set_ipv6_addr *ipv6_add;
 476         struct nfp_fl_push_vlan *push_vlan;
 477         struct nfp_fl_set_tport *tport;
 478         struct nfp_fl_set_eth *eth;
 479         struct nfp_fl_act_head *a;
 480         unsigned int act_off = 0;
 481         u8 act_id = 0;
 482         u8 *ports;
 483         int i;
 484
 485         while (act_off < flow->meta.act_len) {
 486                 a = (struct nfp_fl_act_head *)&flow->action_data[act_off];
 487                 act_id = a->jump_id;
 488
 489                 switch (act_id) {
 490                 case NFP_FL_ACTION_OPCODE_OUTPUT:
 491                         if (act_out)
 492                                 (*act_out)++;
 493                         break;
 494                 case NFP_FL_ACTION_OPCODE_PUSH_VLAN:
 495                         push_vlan = (struct nfp_fl_push_vlan *)a;
 496                         if (push_vlan->vlan_tci)
 497                                 merge->tci = cpu_to_be16(0xffff);
 498                         break;
 499                 case NFP_FL_ACTION_OPCODE_POP_VLAN:
 500                         merge->tci = cpu_to_be16(0);
 501                         break;
 502                 case NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL:
 503                         /* New tunnel header means l2 to l4 can be matched. */
 504                         eth_broadcast_addr(&merge->l2.mac_dst[0]);
 505                         eth_broadcast_addr(&merge->l2.mac_src[0]);
 506                         memset(&merge->l4, 0xff,
 507                                sizeof(struct nfp_flower_tp_ports));
 508                         memset(&merge->ipv4, 0xff,
 509                                sizeof(struct nfp_flower_ipv4));
 510                         break;
 511                 case NFP_FL_ACTION_OPCODE_SET_ETHERNET:
 512                         eth = (struct nfp_fl_set_eth *)a;
 513                         for (i = 0; i < ETH_ALEN; i++)
 514                                 merge->l2.mac_dst[i] |= eth->eth_addr_mask[i];
 515                         for (i = 0; i < ETH_ALEN; i++)
 516                                 merge->l2.mac_src[i] |=
 517                                         eth->eth_addr_mask[ETH_ALEN + i];
 518                         break;
 519                 case NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS:
 520                         ipv4_add = (struct nfp_fl_set_ip4_addrs *)a;
 521                         merge->ipv4.ipv4_src |= ipv4_add->ipv4_src_mask;
 522                         merge->ipv4.ipv4_dst |= ipv4_add->ipv4_dst_mask;
 523                         break;
 524                 case NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS:
 525                         ipv4_ttl_tos = (struct nfp_fl_set_ip4_ttl_tos *)a;
 526                         merge->ipv4.ip_ext.ttl |= ipv4_ttl_tos->ipv4_ttl_mask;
 527                         merge->ipv4.ip_ext.tos |= ipv4_ttl_tos->ipv4_tos_mask;
 528                         break;
 529                 case NFP_FL_ACTION_OPCODE_SET_IPV6_SRC:
 530                         ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 531                         for (i = 0; i < 4; i++)
 532                                 merge->ipv6.ipv6_src.in6_u.u6_addr32[i] |=
 533                                         ipv6_add->ipv6[i].mask;
 534                         break;
 535                 case NFP_FL_ACTION_OPCODE_SET_IPV6_DST:
 536                         ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 537                         for (i = 0; i < 4; i++)
 538                                 merge->ipv6.ipv6_dst.in6_u.u6_addr32[i] |=
 539                                         ipv6_add->ipv6[i].mask;
 540                         break;
 541                 case NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL:
 542                         ipv6_tc_hl_fl = (struct nfp_fl_set_ipv6_tc_hl_fl *)a;
 543                         merge->ipv6.ip_ext.ttl |=
 544                                 ipv6_tc_hl_fl->ipv6_hop_limit_mask;
 545                         merge->ipv6.ip_ext.tos |= ipv6_tc_hl_fl->ipv6_tc_mask;
 546                         merge->ipv6.ipv6_flow_label_exthdr |=
 547                                 ipv6_tc_hl_fl->ipv6_label_mask;
 548                         break;
 549                 case NFP_FL_ACTION_OPCODE_SET_UDP:
 550                 case NFP_FL_ACTION_OPCODE_SET_TCP:
 551                         tport = (struct nfp_fl_set_tport *)a;
 552                         ports = (u8 *)&merge->l4.port_src;
 553                         for (i = 0; i < 4; i++)
 554                                 ports[i] |= tport->tp_port_mask[i];
 555                         break;
 556                 case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 557                 case NFP_FL_ACTION_OPCODE_PRE_LAG:
 558                 case NFP_FL_ACTION_OPCODE_PUSH_GENEVE:
 559                         break;
 560                 default:
 561                         return -EOPNOTSUPP;
 562                 }
 563
 564                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 565         }
 566
 567         if (last_act_id)
 568                 *last_act_id = act_id;
 569
 570         return 0;
 571 }
 572
 573 static int
 574 nfp_flower_populate_merge_match(struct nfp_fl_payload *flow,
 575                                 struct nfp_flower_merge_check *merge,
 576                                 bool extra_fields)
 577 {
 578         struct nfp_flower_meta_tci *meta_tci;
 579         u8 *mask = flow->mask_data;
 580         u8 key_layer, match_size;
 581
 582         memset(merge, 0, sizeof(struct nfp_flower_merge_check));
 583
 584         meta_tci = (struct nfp_flower_meta_tci *)mask;
 585         key_layer = meta_tci->nfp_flow_key_layer;
 586
 587         if (key_layer & ~NFP_FLOWER_MERGE_FIELDS && !extra_fields)
 588                 return -EOPNOTSUPP;
 589
 590         merge->tci = meta_tci->tci;
 591         mask += sizeof(struct nfp_flower_meta_tci);
 592
 593         if (key_layer & NFP_FLOWER_LAYER_EXT_META)
 594                 mask += sizeof(struct nfp_flower_ext_meta);
 595
 596         mask += sizeof(struct nfp_flower_in_port);
 597
 598         if (key_layer & NFP_FLOWER_LAYER_MAC) {
 599                 match_size = sizeof(struct nfp_flower_mac_mpls);
 600                 memcpy(&merge->l2, mask, match_size);
 601                 mask += match_size;
 602         }
 603
 604         if (key_layer & NFP_FLOWER_LAYER_TP) {
 605                 match_size = sizeof(struct nfp_flower_tp_ports);
 606                 memcpy(&merge->l4, mask, match_size);
 607                 mask += match_size;
 608         }
 609
 610         if (key_layer & NFP_FLOWER_LAYER_IPV4) {
 611                 match_size = sizeof(struct nfp_flower_ipv4);
 612                 memcpy(&merge->ipv4, mask, match_size);
 613         }
 614
 615         if (key_layer & NFP_FLOWER_LAYER_IPV6) {
 616                 match_size = sizeof(struct nfp_flower_ipv6);
 617                 memcpy(&merge->ipv6, mask, match_size);
 618         }
 619
 620         return 0;
 621 }
 622
 623 static int
 624 nfp_flower_can_merge(struct nfp_fl_payload *sub_flow1,
 625                      struct nfp_fl_payload *sub_flow2)
 626 {
 627         /* Two flows can be merged if sub_flow2 only matches on bits that are
 628          * either matched by sub_flow1 or set by a sub_flow1 action. This
 629          * ensures that every packet that hits sub_flow1 and recirculates is
 630          * guaranteed to hit sub_flow2.
 631          */
 632         struct nfp_flower_merge_check sub_flow1_merge, sub_flow2_merge;
 633         int err, act_out = 0;
 634         u8 last_act_id = 0;
 635
 636         err = nfp_flower_populate_merge_match(sub_flow1, &sub_flow1_merge,
 637                                               true);
 638         if (err)
 639                 return err;
 640
 641         err = nfp_flower_populate_merge_match(sub_flow2, &sub_flow2_merge,
 642                                               false);
 643         if (err)
 644                 return err;
 645
 646         err = nfp_flower_update_merge_with_actions(sub_flow1, &sub_flow1_merge,
 647                                                    &last_act_id, &act_out);
 648         if (err)
 649                 return err;
 650
 651         /* Must only be 1 output action and it must be the last in sequence. */
 652         if (act_out != 1 || last_act_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 653                 return -EOPNOTSUPP;
 654
 655         /* Reject merge if sub_flow2 matches on something that is not matched
 656          * on or set in an action by sub_flow1.
 657          */
 658         err = bitmap_andnot(sub_flow2_merge.vals, sub_flow2_merge.vals,
 659                             sub_flow1_merge.vals,
 660                             sizeof(struct nfp_flower_merge_check) * 8);
 661         if (err)
 662                 return -EINVAL;
 663
 664         return 0;
 665 }
 666
 667 static unsigned int
 668 nfp_flower_copy_pre_actions(char *act_dst, char *act_src, int len,
 669                             bool *tunnel_act)
 670 {
 671         unsigned int act_off = 0, act_len;
 672         struct nfp_fl_act_head *a;
 673         u8 act_id = 0;
 674
 675         while (act_off < len) {
 676                 a = (struct nfp_fl_act_head *)&act_src[act_off];
 677                 act_len = a->len_lw << NFP_FL_LW_SIZ;
 678                 act_id = a->jump_id;
 679
 680                 switch (act_id) {
 681                 case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 682                         if (tunnel_act)
 683                                 *tunnel_act = true;
 684                         /* fall through */
 685                 case NFP_FL_ACTION_OPCODE_PRE_LAG:
 686                         memcpy(act_dst + act_off, act_src + act_off, act_len);
 687                         break;
 688                 default:
 689                         return act_off;
 690                 }
 691
 692                 act_off += act_len;
 693         }
 694
 695         return act_off;
 696 }
 697
 698 static int nfp_fl_verify_post_tun_acts(char *acts, int len)
 699 {
 700         struct nfp_fl_act_head *a;
 701         unsigned int act_off = 0;
 702
 703         while (act_off < len) {
 704                 a = (struct nfp_fl_act_head *)&acts[act_off];
 705                 if (a->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 706                         return -EOPNOTSUPP;
 707
 708                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 709         }
 710
 711         return 0;
 712 }
 713
 714 static int
 715 nfp_flower_merge_action(struct nfp_fl_payload *sub_flow1,
 716                         struct nfp_fl_payload *sub_flow2,
 717                         struct nfp_fl_payload *merge_flow)
 718 {
 719         unsigned int sub1_act_len, sub2_act_len, pre_off1, pre_off2;
 720         bool tunnel_act = false;
 721         char *merge_act;
 722         int err;
 723
 724         /* The last action of sub_flow1 must be output - do not merge this. */
 725         sub1_act_len = sub_flow1->meta.act_len - sizeof(struct nfp_fl_output);
 726         sub2_act_len = sub_flow2->meta.act_len;
 727
 728         if (!sub2_act_len)
 729                 return -EINVAL;
 730
 731         if (sub1_act_len + sub2_act_len > NFP_FL_MAX_A_SIZ)
 732                 return -EINVAL;
 733
 734         /* A shortcut can only be applied if there is a single action. */
 735         if (sub1_act_len)
 736                 merge_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
 737         else
 738                 merge_flow->meta.shortcut = sub_flow2->meta.shortcut;
 739
 740         merge_flow->meta.act_len = sub1_act_len + sub2_act_len;
 741         merge_act = merge_flow->action_data;
 742
 743         /* Copy any pre-actions to the start of merge flow action list. */
 744         pre_off1 = nfp_flower_copy_pre_actions(merge_act,
 745                                                sub_flow1->action_data,
 746                                                sub1_act_len, &tunnel_act);
 747         merge_act += pre_off1;
 748         sub1_act_len -= pre_off1;
 749         pre_off2 = nfp_flower_copy_pre_actions(merge_act,
 750                                                sub_flow2->action_data,
 751                                                sub2_act_len, NULL);
 752         merge_act += pre_off2;
 753         sub2_act_len -= pre_off2;
 754
 755         /* FW does a tunnel push when egressing, therefore, if sub_flow 1 pushes
 756          * a tunnel, sub_flow 2 can only have output actions for a valid merge.
 757          */
 758         if (tunnel_act) {
 759                 char *post_tun_acts = &sub_flow2->action_data[pre_off2];
 760
 761                 err = nfp_fl_verify_post_tun_acts(post_tun_acts, sub2_act_len);
 762                 if (err)
 763                         return err;
 764         }
 765
 766         /* Copy remaining actions from sub_flows 1 and 2. */
 767         memcpy(merge_act, sub_flow1->action_data + pre_off1, sub1_act_len);
 768         merge_act += sub1_act_len;
 769         memcpy(merge_act, sub_flow2->action_data + pre_off2, sub2_act_len);
 770
 771         return 0;
 772 }
 773
 774 /* Flow link code should only be accessed under RTNL. */
 775 static void nfp_flower_unlink_flow(struct nfp_fl_payload_link *link)
 776 {
 777         list_del(&link->merge_flow.list);
 778         list_del(&link->sub_flow.list);
 779         kfree(link);
 780 }
 781
 782 static void nfp_flower_unlink_flows(struct nfp_fl_payload *merge_flow,
 783                                     struct nfp_fl_payload *sub_flow)
 784 {
 785         struct nfp_fl_payload_link *link;
 786
 787         list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list)
 788                 if (link->sub_flow.flow == sub_flow) {
 789                         nfp_flower_unlink_flow(link);
 790                         return;
 791                 }
 792 }
 793
 794 static int nfp_flower_link_flows(struct nfp_fl_payload *merge_flow,
 795                                  struct nfp_fl_payload *sub_flow)
 796 {
 797         struct nfp_fl_payload_link *link;
 798
 799         link = kmalloc(sizeof(*link), GFP_KERNEL);
 800         if (!link)
 801                 return -ENOMEM;
 802
 803         link->merge_flow.flow = merge_flow;
 804         list_add_tail(&link->merge_flow.list, &merge_flow->linked_flows);
 805         link->sub_flow.flow = sub_flow;
 806         list_add_tail(&link->sub_flow.list, &sub_flow->linked_flows);
 807
 808         return 0;
 809 }
 810
 811 /**
 812  * nfp_flower_merge_offloaded_flows() - Merge 2 existing flows to single flow.
 813  * @app:        Pointer to the APP handle
 814  * @sub_flow1:  Initial flow matched to produce merge hint
 815  * @sub_flow2:  Post recirculation flow matched in merge hint
 816  *
 817  * Combines 2 flows (if valid) to a single flow, removing the initial from hw
 818  * and offloading the new, merged flow.
 819  *
 820  * Return: negative value on error, 0 in success.
 821  */
 822 int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
 823                                      struct nfp_fl_payload *sub_flow1,
 824                                      struct nfp_fl_payload *sub_flow2)
 825 {
 826         struct tc_cls_flower_offload merge_tc_off;
 827         struct nfp_flower_priv *priv = app->priv;
 828         struct netlink_ext_ack *extack = NULL;
 829         struct nfp_fl_payload *merge_flow;
 830         struct nfp_fl_key_ls merge_key_ls;
 831         int err;
 832
 833         ASSERT_RTNL();
 834
 835         extack = merge_tc_off.common.extack;
 836         if (sub_flow1 == sub_flow2 ||
 837             nfp_flower_is_merge_flow(sub_flow1) ||
 838             nfp_flower_is_merge_flow(sub_flow2))
 839                 return -EINVAL;
 840
 841         err = nfp_flower_can_merge(sub_flow1, sub_flow2);
 842         if (err)
 843                 return err;
 844
 845         merge_key_ls.key_size = sub_flow1->meta.key_len;
 846
 847         merge_flow = nfp_flower_allocate_new(&merge_key_ls);
 848         if (!merge_flow)
 849                 return -ENOMEM;
 850
 851         merge_flow->tc_flower_cookie = (unsigned long)merge_flow;
 852         merge_flow->ingress_dev = sub_flow1->ingress_dev;
 853
 854         memcpy(merge_flow->unmasked_data, sub_flow1->unmasked_data,
 855                sub_flow1->meta.key_len);
 856         memcpy(merge_flow->mask_data, sub_flow1->mask_data,
 857                sub_flow1->meta.mask_len);
 858
 859         err = nfp_flower_merge_action(sub_flow1, sub_flow2, merge_flow);
 860         if (err)
 861                 goto err_destroy_merge_flow;
 862
 863         err = nfp_flower_link_flows(merge_flow, sub_flow1);
 864         if (err)
 865                 goto err_destroy_merge_flow;
 866
 867         err = nfp_flower_link_flows(merge_flow, sub_flow2);
 868         if (err)
 869                 goto err_unlink_sub_flow1;
 870
 871         merge_tc_off.cookie = merge_flow->tc_flower_cookie;
 872         err = nfp_compile_flow_metadata(app, &merge_tc_off, merge_flow,
 873                                         merge_flow->ingress_dev, extack);
 874         if (err)
 875                 goto err_unlink_sub_flow2;
 876
 877         err = rhashtable_insert_fast(&priv->flow_table, &merge_flow->fl_node,
 878                                      nfp_flower_table_params);
 879         if (err)
 880                 goto err_release_metadata;
 881
 882         err = nfp_flower_xmit_flow(app, merge_flow,
 883                                    NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
 884         if (err)
 885                 goto err_remove_rhash;
 886
 887         merge_flow->in_hw = true;
 888         sub_flow1->in_hw = false;
 889
 890         return 0;
 891
 892 err_remove_rhash:
 893         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 894                                             &merge_flow->fl_node,
 895                                             nfp_flower_table_params));
 896 err_release_metadata:
 897         nfp_modify_flow_metadata(app, merge_flow);
 898 err_unlink_sub_flow2:
 899         nfp_flower_unlink_flows(merge_flow, sub_flow2);
 900 err_unlink_sub_flow1:
 901         nfp_flower_unlink_flows(merge_flow, sub_flow1);
 902 err_destroy_merge_flow:
 903         kfree(merge_flow->action_data);
 904         kfree(merge_flow->mask_data);
 905         kfree(merge_flow->unmasked_data);
 906         kfree(merge_flow);
 907         return err;
 908 }
 909
 910 /**
 911  * nfp_flower_add_offload() - Adds a new flow to hardware.
 912  * @app:        Pointer to the APP handle
 913  * @netdev:     netdev structure.
 914  * @flow:       TC flower classifier offload structure.
 915  *
 916  * Adds a new flow to the repeated hash structure and action payload.
 917  *
 918  * Return: negative value on error, 0 if configured successfully.
 919  */
 920 static int
 921 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 922                        struct tc_cls_flower_offload *flow)
 923 {
 924         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 925         struct nfp_flower_priv *priv = app->priv;
 926         struct netlink_ext_ack *extack = NULL;
 927         struct nfp_fl_payload *flow_pay;
 928         struct nfp_fl_key_ls *key_layer;
 929         struct nfp_port *port = NULL;
 930         int err;
 931
 932         extack = flow->common.extack;
 933         if (nfp_netdev_is_nfp_repr(netdev))
 934                 port = nfp_port_from_netdev(netdev);
 935
 936         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 937         if (!key_layer)
 938                 return -ENOMEM;
 939
 940         err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
 941                                               &tun_type, extack);
 942         if (err)
 943                 goto err_free_key_ls;
 944
 945         flow_pay = nfp_flower_allocate_new(key_layer);
 946         if (!flow_pay) {
 947                 err = -ENOMEM;
 948                 goto err_free_key_ls;
 949         }
 950
 951         err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
 952                                             flow_pay, tun_type, extack);
 953         if (err)
 954                 goto err_destroy_flow;
 955
 956         err = nfp_flower_compile_action(app, flow, netdev, flow_pay, extack);
 957         if (err)
 958                 goto err_destroy_flow;
 959
 960         err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev, extack);
 961         if (err)
 962                 goto err_destroy_flow;
 963
 964         flow_pay->tc_flower_cookie = flow->cookie;
 965         err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
 966                                      nfp_flower_table_params);
 967         if (err) {
 968                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot insert flow into tables for offloads");
 969                 goto err_release_metadata;
 970         }
 971
 972         err = nfp_flower_xmit_flow(app, flow_pay,
 973                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 974         if (err)
 975                 goto err_remove_rhash;
 976
 977         if (port)
 978                 port->tc_offload_cnt++;
 979
 980         flow_pay->in_hw = true;
 981
 982         /* Deallocate flow payload when flower rule has been destroyed. */
 983         kfree(key_layer);
 984
 985         return 0;
 986
 987 err_remove_rhash:
 988         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 989                                             &flow_pay->fl_node,
 990                                             nfp_flower_table_params));
 991 err_release_metadata:
 992         nfp_modify_flow_metadata(app, flow_pay);
 993 err_destroy_flow:
 994         kfree(flow_pay->action_data);
 995         kfree(flow_pay->mask_data);
 996         kfree(flow_pay->unmasked_data);
 997         kfree(flow_pay);
 998 err_free_key_ls:
 999         kfree(key_layer);
1000         return err;
1001 }
1002
1003 static void
1004 nfp_flower_remove_merge_flow(struct nfp_app *app,
1005                              struct nfp_fl_payload *del_sub_flow,
1006                              struct nfp_fl_payload *merge_flow)
1007 {
1008         struct nfp_flower_priv *priv = app->priv;
1009         struct nfp_fl_payload_link *link, *temp;
1010         struct nfp_fl_payload *origin;
1011         bool mod = false;
1012         int err;
1013
1014         link = list_first_entry(&merge_flow->linked_flows,
1015                                 struct nfp_fl_payload_link, merge_flow.list);
1016         origin = link->sub_flow.flow;
1017
1018         /* Re-add rule the merge had overwritten if it has not been deleted. */
1019         if (origin != del_sub_flow)
1020                 mod = true;
1021
1022         err = nfp_modify_flow_metadata(app, merge_flow);
1023         if (err) {
1024                 nfp_flower_cmsg_warn(app, "Metadata fail for merge flow delete.\n");
1025                 goto err_free_links;
1026         }
1027
1028         if (!mod) {
1029                 err = nfp_flower_xmit_flow(app, merge_flow,
1030                                            NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1031                 if (err) {
1032                         nfp_flower_cmsg_warn(app, "Failed to delete merged flow.\n");
1033                         goto err_free_links;
1034                 }
1035         } else {
1036                 __nfp_modify_flow_metadata(priv, origin);
1037                 err = nfp_flower_xmit_flow(app, origin,
1038                                            NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
1039                 if (err)
1040                         nfp_flower_cmsg_warn(app, "Failed to revert merge flow.\n");
1041                 origin->in_hw = true;
1042         }
1043
1044 err_free_links:
1045         /* Clean any links connected with the merged flow. */
1046         list_for_each_entry_safe(link, temp, &merge_flow->linked_flows,
1047                                  merge_flow.list)
1048                 nfp_flower_unlink_flow(link);
1049
1050         kfree(merge_flow->action_data);
1051         kfree(merge_flow->mask_data);
1052         kfree(merge_flow->unmasked_data);
1053         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1054                                             &merge_flow->fl_node,
1055                                             nfp_flower_table_params));
1056         kfree_rcu(merge_flow, rcu);
1057 }
1058
1059 static void
1060 nfp_flower_del_linked_merge_flows(struct nfp_app *app,
1061                                   struct nfp_fl_payload *sub_flow)
1062 {
1063         struct nfp_fl_payload_link *link, *temp;
1064
1065         /* Remove any merge flow formed from the deleted sub_flow. */
1066         list_for_each_entry_safe(link, temp, &sub_flow->linked_flows,
1067                                  sub_flow.list)
1068                 nfp_flower_remove_merge_flow(app, sub_flow,
1069                                              link->merge_flow.flow);
1070 }
1071
1072 /**
1073  * nfp_flower_del_offload() - Removes a flow from hardware.
1074  * @app:        Pointer to the APP handle
1075  * @netdev:     netdev structure.
1076  * @flow:       TC flower classifier offload structure
1077  *
1078  * Removes a flow from the repeated hash structure and clears the
1079  * action payload. Any flows merged from this are also deleted.
1080  *
1081  * Return: negative value on error, 0 if removed successfully.
1082  */
1083 static int
1084 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
1085                        struct tc_cls_flower_offload *flow)
1086 {
1087         struct nfp_flower_priv *priv = app->priv;
1088         struct netlink_ext_ack *extack = NULL;
1089         struct nfp_fl_payload *nfp_flow;
1090         struct nfp_port *port = NULL;
1091         int err;
1092
1093         extack = flow->common.extack;
1094         if (nfp_netdev_is_nfp_repr(netdev))
1095                 port = nfp_port_from_netdev(netdev);
1096
1097         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1098         if (!nfp_flow) {
1099                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot remove flow that does not exist");
1100                 return -ENOENT;
1101         }
1102
1103         err = nfp_modify_flow_metadata(app, nfp_flow);
1104         if (err)
1105                 goto err_free_merge_flow;
1106
1107         if (nfp_flow->nfp_tun_ipv4_addr)
1108                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
1109
1110         if (!nfp_flow->in_hw) {
1111                 err = 0;
1112                 goto err_free_merge_flow;
1113         }
1114
1115         err = nfp_flower_xmit_flow(app, nfp_flow,
1116                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1117         /* Fall through on error. */
1118
1119 err_free_merge_flow:
1120         nfp_flower_del_linked_merge_flows(app, nfp_flow);
1121         if (port)
1122                 port->tc_offload_cnt--;
1123         kfree(nfp_flow->action_data);
1124         kfree(nfp_flow->mask_data);
1125         kfree(nfp_flow->unmasked_data);
1126         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1127                                             &nfp_flow->fl_node,
1128                                             nfp_flower_table_params));
1129         kfree_rcu(nfp_flow, rcu);
1130         return err;
1131 }
1132
1133 static void
1134 __nfp_flower_update_merge_stats(struct nfp_app *app,
1135                                 struct nfp_fl_payload *merge_flow)
1136 {
1137         struct nfp_flower_priv *priv = app->priv;
1138         struct nfp_fl_payload_link *link;
1139         struct nfp_fl_payload *sub_flow;
1140         u64 pkts, bytes, used;
1141         u32 ctx_id;
1142
1143         ctx_id = be32_to_cpu(merge_flow->meta.host_ctx_id);
1144         pkts = priv->stats[ctx_id].pkts;
1145         /* Do not cycle subflows if no stats to distribute. */
1146         if (!pkts)
1147                 return;
1148         bytes = priv->stats[ctx_id].bytes;
1149         used = priv->stats[ctx_id].used;
1150
1151         /* Reset stats for the merge flow. */
1152         priv->stats[ctx_id].pkts = 0;
1153         priv->stats[ctx_id].bytes = 0;
1154
1155         /* The merge flow has received stats updates from firmware.
1156          * Distribute these stats to all subflows that form the merge.
1157          * The stats will collected from TC via the subflows.
1158          */
1159         list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list) {
1160                 sub_flow = link->sub_flow.flow;
1161                 ctx_id = be32_to_cpu(sub_flow->meta.host_ctx_id);
1162                 priv->stats[ctx_id].pkts += pkts;
1163                 priv->stats[ctx_id].bytes += bytes;
1164                 max_t(u64, priv->stats[ctx_id].used, used);
1165         }
1166 }
1167
1168 static void
1169 nfp_flower_update_merge_stats(struct nfp_app *app,
1170                               struct nfp_fl_payload *sub_flow)
1171 {
1172         struct nfp_fl_payload_link *link;
1173
1174         /* Get merge flows that the subflow forms to distribute their stats. */
1175         list_for_each_entry(link, &sub_flow->linked_flows, sub_flow.list)
1176                 __nfp_flower_update_merge_stats(app, link->merge_flow.flow);
1177 }
1178
1179 /**
1180  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
1181  * @app:        Pointer to the APP handle
1182  * @netdev:     Netdev structure.
1183  * @flow:       TC flower classifier offload structure
1184  *
1185  * Populates a flow statistics structure which which corresponds to a
1186  * specific flow.
1187  *
1188  * Return: negative value on error, 0 if stats populated successfully.
1189  */
1190 static int
1191 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
1192                      struct tc_cls_flower_offload *flow)
1193 {
1194         struct nfp_flower_priv *priv = app->priv;
1195         struct netlink_ext_ack *extack = NULL;
1196         struct nfp_fl_payload *nfp_flow;
1197         u32 ctx_id;
1198
1199         extack = flow->common.extack;
1200         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1201         if (!nfp_flow) {
1202                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot dump stats for flow that does not exist");
1203                 return -EINVAL;
1204         }
1205
1206         ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
1207
1208         spin_lock_bh(&priv->stats_lock);
1209         /* If request is for a sub_flow, update stats from merged flows. */
1210         if (!list_empty(&nfp_flow->linked_flows))
1211                 nfp_flower_update_merge_stats(app, nfp_flow);
1212
1213         flow_stats_update(&flow->stats, priv->stats[ctx_id].bytes,
1214                           priv->stats[ctx_id].pkts, priv->stats[ctx_id].used);
1215
1216         priv->stats[ctx_id].pkts = 0;
1217         priv->stats[ctx_id].bytes = 0;
1218         spin_unlock_bh(&priv->stats_lock);
1219
1220         return 0;
1221 }
1222
1223 static int
1224 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
1225                         struct tc_cls_flower_offload *flower)
1226 {
1227         if (!eth_proto_is_802_3(flower->common.protocol))
1228                 return -EOPNOTSUPP;
1229
1230         switch (flower->command) {
1231         case TC_CLSFLOWER_REPLACE:
1232                 return nfp_flower_add_offload(app, netdev, flower);
1233         case TC_CLSFLOWER_DESTROY:
1234                 return nfp_flower_del_offload(app, netdev, flower);
1235         case TC_CLSFLOWER_STATS:
1236                 return nfp_flower_get_stats(app, netdev, flower);
1237         default:
1238                 return -EOPNOTSUPP;
1239         }
1240 }
1241
1242 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
1243                                         void *type_data, void *cb_priv)
1244 {
1245         struct nfp_repr *repr = cb_priv;
1246
1247         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
1248                 return -EOPNOTSUPP;
1249
1250         switch (type) {
1251         case TC_SETUP_CLSFLOWER:
1252                 return nfp_flower_repr_offload(repr->app, repr->netdev,
1253                                                type_data);
1254         case TC_SETUP_CLSMATCHALL:
1255                 return nfp_flower_setup_qos_offload(repr->app, repr->netdev,
1256                                                     type_data);
1257         default:
1258                 return -EOPNOTSUPP;
1259         }
1260 }
1261
1262 static int nfp_flower_setup_tc_block(struct net_device *netdev,
1263                                      struct tc_block_offload *f)
1264 {
1265         struct nfp_repr *repr = netdev_priv(netdev);
1266         struct nfp_flower_repr_priv *repr_priv;
1267
1268         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1269                 return -EOPNOTSUPP;
1270
1271         repr_priv = repr->app_priv;
1272         repr_priv->block_shared = tcf_block_shared(f->block);
1273
1274         switch (f->command) {
1275         case TC_BLOCK_BIND:
1276                 return tcf_block_cb_register(f->block,
1277                                              nfp_flower_setup_tc_block_cb,
1278                                              repr, repr, f->extack);
1279         case TC_BLOCK_UNBIND:
1280                 tcf_block_cb_unregister(f->block,
1281                                         nfp_flower_setup_tc_block_cb,
1282                                         repr);
1283                 return 0;
1284         default:
1285                 return -EOPNOTSUPP;
1286         }
1287 }
1288
1289 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
1290                         enum tc_setup_type type, void *type_data)
1291 {
1292         switch (type) {
1293         case TC_SETUP_BLOCK:
1294                 return nfp_flower_setup_tc_block(netdev, type_data);
1295         default:
1296                 return -EOPNOTSUPP;
1297         }
1298 }
1299
1300 struct nfp_flower_indr_block_cb_priv {
1301         struct net_device *netdev;
1302         struct nfp_app *app;
1303         struct list_head list;
1304 };
1305
1306 static struct nfp_flower_indr_block_cb_priv *
1307 nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
1308                                      struct net_device *netdev)
1309 {
1310         struct nfp_flower_indr_block_cb_priv *cb_priv;
1311         struct nfp_flower_priv *priv = app->priv;
1312
1313         /* All callback list access should be protected by RTNL. */
1314         ASSERT_RTNL();
1315
1316         list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
1317                 if (cb_priv->netdev == netdev)
1318                         return cb_priv;
1319
1320         return NULL;
1321 }
1322
1323 static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
1324                                           void *type_data, void *cb_priv)
1325 {
1326         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
1327         struct tc_cls_flower_offload *flower = type_data;
1328
1329         if (flower->common.chain_index)
1330                 return -EOPNOTSUPP;
1331
1332         switch (type) {
1333         case TC_SETUP_CLSFLOWER:
1334                 return nfp_flower_repr_offload(priv->app, priv->netdev,
1335                                                type_data);
1336         default:
1337                 return -EOPNOTSUPP;
1338         }
1339 }
1340
1341 static int
1342 nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
1343                                struct tc_block_offload *f)
1344 {
1345         struct nfp_flower_indr_block_cb_priv *cb_priv;
1346         struct nfp_flower_priv *priv = app->priv;
1347         int err;
1348
1349         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1350             !(f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS &&
1351               nfp_flower_internal_port_can_offload(app, netdev)))
1352                 return -EOPNOTSUPP;
1353
1354         switch (f->command) {
1355         case TC_BLOCK_BIND:
1356                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
1357                 if (!cb_priv)
1358                         return -ENOMEM;
1359
1360                 cb_priv->netdev = netdev;
1361                 cb_priv->app = app;
1362                 list_add(&cb_priv->list, &priv->indr_block_cb_priv);
1363
1364                 err = tcf_block_cb_register(f->block,
1365                                             nfp_flower_setup_indr_block_cb,
1366                                             cb_priv, cb_priv, f->extack);
1367                 if (err) {
1368                         list_del(&cb_priv->list);
1369                         kfree(cb_priv);
1370                 }
1371
1372                 return err;
1373         case TC_BLOCK_UNBIND:
1374                 cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
1375                 if (!cb_priv)
1376                         return -ENOENT;
1377
1378                 tcf_block_cb_unregister(f->block,
1379                                         nfp_flower_setup_indr_block_cb,
1380                                         cb_priv);
1381                 list_del(&cb_priv->list);
1382                 kfree(cb_priv);
1383
1384                 return 0;
1385         default:
1386                 return -EOPNOTSUPP;
1387         }
1388         return 0;
1389 }
1390
1391 static int
1392 nfp_flower_indr_setup_tc_cb(struct net_device *netdev, void *cb_priv,
1393                             enum tc_setup_type type, void *type_data)
1394 {
1395         switch (type) {
1396         case TC_SETUP_BLOCK:
1397                 return nfp_flower_setup_indr_tc_block(netdev, cb_priv,
1398                                                       type_data);
1399         default:
1400                 return -EOPNOTSUPP;
1401         }
1402 }
1403
1404 int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
1405                                        struct net_device *netdev,
1406                                        unsigned long event)
1407 {
1408         int err;
1409
1410         if (!nfp_fl_is_netdev_to_offload(netdev))
1411                 return NOTIFY_OK;
1412
1413         if (event == NETDEV_REGISTER) {
1414                 err = __tc_indr_block_cb_register(netdev, app,
1415                                                   nfp_flower_indr_setup_tc_cb,
1416                                                   app);
1417                 if (err)
1418                         nfp_flower_cmsg_warn(app,
1419                                              "Indirect block reg failed - %s\n",
1420                                              netdev->name);
1421         } else if (event == NETDEV_UNREGISTER) {
1422                 __tc_indr_block_cb_unregister(netdev,
1423                                               nfp_flower_indr_setup_tc_cb, app);
1424         }
1425
1426         return NOTIFY_OK;
1427 }