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_dissector_key_enc_opts *enc_opts,
 145                           u32 *key_layer_two, int *key_size,
 146                           struct netlink_ext_ack *extack)
 147 {
 148         if (enc_opts->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->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_calc_udp_tun_layer(struct flow_dissector_key_ports *enc_ports,
 163                               struct flow_dissector_key_enc_opts *enc_op,
 164                               u32 *key_layer_two, u8 *key_layer, int *key_size,
 165                               struct nfp_flower_priv *priv,
 166                               enum nfp_flower_tun_type *tun_type,
 167                               struct netlink_ext_ack *extack)
 168 {
 169         int err;
 170
 171         switch (enc_ports->dst) {
 172         case htons(IANA_VXLAN_UDP_PORT):
 173                 *tun_type = NFP_FL_TUNNEL_VXLAN;
 174                 *key_layer |= NFP_FLOWER_LAYER_VXLAN;
 175                 *key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 176
 177                 if (enc_op) {
 178                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on vxlan tunnels");
 179                         return -EOPNOTSUPP;
 180                 }
 181                 break;
 182         case htons(GENEVE_UDP_PORT):
 183                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE)) {
 184                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve offload");
 185                         return -EOPNOTSUPP;
 186                 }
 187                 *tun_type = NFP_FL_TUNNEL_GENEVE;
 188                 *key_layer |= NFP_FLOWER_LAYER_EXT_META;
 189                 *key_size += sizeof(struct nfp_flower_ext_meta);
 190                 *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 191                 *key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 192
 193                 if (!enc_op)
 194                         break;
 195                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT)) {
 196                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve option offload");
 197                         return -EOPNOTSUPP;
 198                 }
 199                 err = nfp_flower_calc_opt_layer(enc_op, key_layer_two,
 200                                                 key_size, extack);
 201                 if (err)
 202                         return err;
 203                 break;
 204         default:
 205                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel type unknown");
 206                 return -EOPNOTSUPP;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int
 213 nfp_flower_calculate_key_layers(struct nfp_app *app,
 214                                 struct net_device *netdev,
 215                                 struct nfp_fl_key_ls *ret_key_ls,
 216                                 struct tc_cls_flower_offload *flow,
 217                                 enum nfp_flower_tun_type *tun_type,
 218                                 struct netlink_ext_ack *extack)
 219 {
 220         struct flow_rule *rule = tc_cls_flower_offload_flow_rule(flow);
 221         struct flow_dissector *dissector = rule->match.dissector;
 222         struct flow_match_basic basic = { NULL, NULL};
 223         struct nfp_flower_priv *priv = app->priv;
 224         u32 key_layer_two;
 225         u8 key_layer;
 226         int key_size;
 227         int err;
 228
 229         if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR) {
 230                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match not supported");
 231                 return -EOPNOTSUPP;
 232         }
 233
 234         /* If any tun dissector is used then the required set must be used. */
 235         if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 236             (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 237             != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R) {
 238                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel match not supported");
 239                 return -EOPNOTSUPP;
 240         }
 241
 242         key_layer_two = 0;
 243         key_layer = NFP_FLOWER_LAYER_PORT;
 244         key_size = sizeof(struct nfp_flower_meta_tci) +
 245                    sizeof(struct nfp_flower_in_port);
 246
 247         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 248             flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
 249                 key_layer |= NFP_FLOWER_LAYER_MAC;
 250                 key_size += sizeof(struct nfp_flower_mac_mpls);
 251         }
 252
 253         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
 254                 struct flow_match_vlan vlan;
 255
 256                 flow_rule_match_vlan(rule, &vlan);
 257                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 258                     vlan.key->vlan_priority) {
 259                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN PCP offload");
 260                         return -EOPNOTSUPP;
 261                 }
 262         }
 263
 264         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 265                 struct flow_match_enc_opts enc_op = { NULL, NULL };
 266                 struct flow_match_ipv4_addrs ipv4_addrs;
 267                 struct flow_match_control enc_ctl;
 268                 struct flow_match_ports enc_ports;
 269
 270                 flow_rule_match_enc_control(rule, &enc_ctl);
 271
 272                 if (enc_ctl.mask->addr_type != 0xffff) {
 273                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: wildcarded protocols on tunnels are not supported");
 274                         return -EOPNOTSUPP;
 275                 }
 276                 if (enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
 277                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only IPv4 tunnels are supported");
 278                         return -EOPNOTSUPP;
 279                 }
 280
 281                 /* These fields are already verified as used. */
 282                 flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
 283                 if (ipv4_addrs.mask->dst != cpu_to_be32(~0)) {
 284                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv4 destination address is supported");
 285                         return -EOPNOTSUPP;
 286                 }
 287
 288                 flow_rule_match_enc_ports(rule, &enc_ports);
 289                 if (enc_ports.mask->dst != cpu_to_be16(~0)) {
 290                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match L4 destination port is supported");
 291                         return -EOPNOTSUPP;
 292                 }
 293
 294                 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
 295                         flow_rule_match_enc_opts(rule, &enc_op);
 296
 297
 298                 err = nfp_flower_calc_udp_tun_layer(enc_ports.key, enc_op.key,
 299                                                     &key_layer_two, &key_layer,
 300                                                     &key_size, priv, tun_type,
 301                                                     extack);
 302                 if (err)
 303                         return err;
 304
 305                 /* Ensure the ingress netdev matches the expected tun type. */
 306                 if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type)) {
 307                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ingress netdev does not match the expected tunnel type");
 308                         return -EOPNOTSUPP;
 309                 }
 310         }
 311
 312         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
 313                 flow_rule_match_basic(rule, &basic);
 314
 315         if (basic.mask && basic.mask->n_proto) {
 316                 /* Ethernet type is present in the key. */
 317                 switch (basic.key->n_proto) {
 318                 case cpu_to_be16(ETH_P_IP):
 319                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 320                         key_size += sizeof(struct nfp_flower_ipv4);
 321                         break;
 322
 323                 case cpu_to_be16(ETH_P_IPV6):
 324                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 325                         key_size += sizeof(struct nfp_flower_ipv6);
 326                         break;
 327
 328                 /* Currently we do not offload ARP
 329                  * because we rely on it to get to the host.
 330                  */
 331                 case cpu_to_be16(ETH_P_ARP):
 332                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ARP not supported");
 333                         return -EOPNOTSUPP;
 334
 335                 case cpu_to_be16(ETH_P_MPLS_UC):
 336                 case cpu_to_be16(ETH_P_MPLS_MC):
 337                         if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 338                                 key_layer |= NFP_FLOWER_LAYER_MAC;
 339                                 key_size += sizeof(struct nfp_flower_mac_mpls);
 340                         }
 341                         break;
 342
 343                 /* Will be included in layer 2. */
 344                 case cpu_to_be16(ETH_P_8021Q):
 345                         break;
 346
 347                 default:
 348                         /* Other ethtype - we need check the masks for the
 349                          * remainder of the key to ensure we can offload.
 350                          */
 351                         if (nfp_flower_check_higher_than_mac(flow)) {
 352                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: non IPv4/IPv6 offload with L3/L4 matches not supported");
 353                                 return -EOPNOTSUPP;
 354                         }
 355                         break;
 356                 }
 357         }
 358
 359         if (basic.mask && basic.mask->ip_proto) {
 360                 switch (basic.key->ip_proto) {
 361                 case IPPROTO_TCP:
 362                 case IPPROTO_UDP:
 363                 case IPPROTO_SCTP:
 364                 case IPPROTO_ICMP:
 365                 case IPPROTO_ICMPV6:
 366                         key_layer |= NFP_FLOWER_LAYER_TP;
 367                         key_size += sizeof(struct nfp_flower_tp_ports);
 368                         break;
 369                 default:
 370                         /* Other ip proto - we need check the masks for the
 371                          * remainder of the key to ensure we can offload.
 372                          */
 373                         if (nfp_flower_check_higher_than_l3(flow)) {
 374                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: unknown IP protocol with L4 matches not supported");
 375                                 return -EOPNOTSUPP;
 376                         }
 377                         break;
 378                 }
 379         }
 380
 381         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
 382                 struct flow_match_tcp tcp;
 383                 u32 tcp_flags;
 384
 385                 flow_rule_match_tcp(rule, &tcp);
 386                 tcp_flags = be16_to_cpu(tcp.key->flags);
 387
 388                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS) {
 389                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: no match support for selected TCP flags");
 390                         return -EOPNOTSUPP;
 391                 }
 392
 393                 /* We only support PSH and URG flags when either
 394                  * FIN, SYN or RST is present as well.
 395                  */
 396                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 397                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST))) {
 398                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: PSH and URG is only supported when used with FIN, SYN or RST");
 399                         return -EOPNOTSUPP;
 400                 }
 401
 402                 /* We need to store TCP flags in the either the IPv4 or IPv6 key
 403                  * space, thus we need to ensure we include a IPv4/IPv6 key
 404                  * layer if we have not done so already.
 405                  */
 406                 if (!basic.key) {
 407                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on L3 protocol");
 408                         return -EOPNOTSUPP;
 409                 }
 410
 411                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 412                     !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
 413                         switch (basic.key->n_proto) {
 414                         case cpu_to_be16(ETH_P_IP):
 415                                 key_layer |= NFP_FLOWER_LAYER_IPV4;
 416                                 key_size += sizeof(struct nfp_flower_ipv4);
 417                                 break;
 418
 419                         case cpu_to_be16(ETH_P_IPV6):
 420                                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 421                                 key_size += sizeof(struct nfp_flower_ipv6);
 422                                 break;
 423
 424                         default:
 425                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on IPv4/IPv6");
 426                                 return -EOPNOTSUPP;
 427                         }
 428                 }
 429         }
 430
 431         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 432                 struct flow_match_control ctl;
 433
 434                 flow_rule_match_control(rule, &ctl);
 435                 if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS) {
 436                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on unknown control flag");
 437                         return -EOPNOTSUPP;
 438                 }
 439         }
 440
 441         ret_key_ls->key_layer = key_layer;
 442         ret_key_ls->key_layer_two = key_layer_two;
 443         ret_key_ls->key_size = key_size;
 444
 445         return 0;
 446 }
 447
 448 static struct nfp_fl_payload *
 449 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 450 {
 451         struct nfp_fl_payload *flow_pay;
 452
 453         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 454         if (!flow_pay)
 455                 return NULL;
 456
 457         flow_pay->meta.key_len = key_layer->key_size;
 458         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 459         if (!flow_pay->unmasked_data)
 460                 goto err_free_flow;
 461
 462         flow_pay->meta.mask_len = key_layer->key_size;
 463         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 464         if (!flow_pay->mask_data)
 465                 goto err_free_unmasked;
 466
 467         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 468         if (!flow_pay->action_data)
 469                 goto err_free_mask;
 470
 471         flow_pay->nfp_tun_ipv4_addr = 0;
 472         flow_pay->meta.flags = 0;
 473         INIT_LIST_HEAD(&flow_pay->linked_flows);
 474         flow_pay->in_hw = false;
 475
 476         return flow_pay;
 477
 478 err_free_mask:
 479         kfree(flow_pay->mask_data);
 480 err_free_unmasked:
 481         kfree(flow_pay->unmasked_data);
 482 err_free_flow:
 483         kfree(flow_pay);
 484         return NULL;
 485 }
 486
 487 static int
 488 nfp_flower_update_merge_with_actions(struct nfp_fl_payload *flow,
 489                                      struct nfp_flower_merge_check *merge,
 490                                      u8 *last_act_id, int *act_out)
 491 {
 492         struct nfp_fl_set_ipv6_tc_hl_fl *ipv6_tc_hl_fl;
 493         struct nfp_fl_set_ip4_ttl_tos *ipv4_ttl_tos;
 494         struct nfp_fl_set_ip4_addrs *ipv4_add;
 495         struct nfp_fl_set_ipv6_addr *ipv6_add;
 496         struct nfp_fl_push_vlan *push_vlan;
 497         struct nfp_fl_set_tport *tport;
 498         struct nfp_fl_set_eth *eth;
 499         struct nfp_fl_act_head *a;
 500         unsigned int act_off = 0;
 501         u8 act_id = 0;
 502         u8 *ports;
 503         int i;
 504
 505         while (act_off < flow->meta.act_len) {
 506                 a = (struct nfp_fl_act_head *)&flow->action_data[act_off];
 507                 act_id = a->jump_id;
 508
 509                 switch (act_id) {
 510                 case NFP_FL_ACTION_OPCODE_OUTPUT:
 511                         if (act_out)
 512                                 (*act_out)++;
 513                         break;
 514                 case NFP_FL_ACTION_OPCODE_PUSH_VLAN:
 515                         push_vlan = (struct nfp_fl_push_vlan *)a;
 516                         if (push_vlan->vlan_tci)
 517                                 merge->tci = cpu_to_be16(0xffff);
 518                         break;
 519                 case NFP_FL_ACTION_OPCODE_POP_VLAN:
 520                         merge->tci = cpu_to_be16(0);
 521                         break;
 522                 case NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL:
 523                         /* New tunnel header means l2 to l4 can be matched. */
 524                         eth_broadcast_addr(&merge->l2.mac_dst[0]);
 525                         eth_broadcast_addr(&merge->l2.mac_src[0]);
 526                         memset(&merge->l4, 0xff,
 527                                sizeof(struct nfp_flower_tp_ports));
 528                         memset(&merge->ipv4, 0xff,
 529                                sizeof(struct nfp_flower_ipv4));
 530                         break;
 531                 case NFP_FL_ACTION_OPCODE_SET_ETHERNET:
 532                         eth = (struct nfp_fl_set_eth *)a;
 533                         for (i = 0; i < ETH_ALEN; i++)
 534                                 merge->l2.mac_dst[i] |= eth->eth_addr_mask[i];
 535                         for (i = 0; i < ETH_ALEN; i++)
 536                                 merge->l2.mac_src[i] |=
 537                                         eth->eth_addr_mask[ETH_ALEN + i];
 538                         break;
 539                 case NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS:
 540                         ipv4_add = (struct nfp_fl_set_ip4_addrs *)a;
 541                         merge->ipv4.ipv4_src |= ipv4_add->ipv4_src_mask;
 542                         merge->ipv4.ipv4_dst |= ipv4_add->ipv4_dst_mask;
 543                         break;
 544                 case NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS:
 545                         ipv4_ttl_tos = (struct nfp_fl_set_ip4_ttl_tos *)a;
 546                         merge->ipv4.ip_ext.ttl |= ipv4_ttl_tos->ipv4_ttl_mask;
 547                         merge->ipv4.ip_ext.tos |= ipv4_ttl_tos->ipv4_tos_mask;
 548                         break;
 549                 case NFP_FL_ACTION_OPCODE_SET_IPV6_SRC:
 550                         ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 551                         for (i = 0; i < 4; i++)
 552                                 merge->ipv6.ipv6_src.in6_u.u6_addr32[i] |=
 553                                         ipv6_add->ipv6[i].mask;
 554                         break;
 555                 case NFP_FL_ACTION_OPCODE_SET_IPV6_DST:
 556                         ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 557                         for (i = 0; i < 4; i++)
 558                                 merge->ipv6.ipv6_dst.in6_u.u6_addr32[i] |=
 559                                         ipv6_add->ipv6[i].mask;
 560                         break;
 561                 case NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL:
 562                         ipv6_tc_hl_fl = (struct nfp_fl_set_ipv6_tc_hl_fl *)a;
 563                         merge->ipv6.ip_ext.ttl |=
 564                                 ipv6_tc_hl_fl->ipv6_hop_limit_mask;
 565                         merge->ipv6.ip_ext.tos |= ipv6_tc_hl_fl->ipv6_tc_mask;
 566                         merge->ipv6.ipv6_flow_label_exthdr |=
 567                                 ipv6_tc_hl_fl->ipv6_label_mask;
 568                         break;
 569                 case NFP_FL_ACTION_OPCODE_SET_UDP:
 570                 case NFP_FL_ACTION_OPCODE_SET_TCP:
 571                         tport = (struct nfp_fl_set_tport *)a;
 572                         ports = (u8 *)&merge->l4.port_src;
 573                         for (i = 0; i < 4; i++)
 574                                 ports[i] |= tport->tp_port_mask[i];
 575                         break;
 576                 case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 577                 case NFP_FL_ACTION_OPCODE_PRE_LAG:
 578                 case NFP_FL_ACTION_OPCODE_PUSH_GENEVE:
 579                         break;
 580                 default:
 581                         return -EOPNOTSUPP;
 582                 }
 583
 584                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 585         }
 586
 587         if (last_act_id)
 588                 *last_act_id = act_id;
 589
 590         return 0;
 591 }
 592
 593 static int
 594 nfp_flower_populate_merge_match(struct nfp_fl_payload *flow,
 595                                 struct nfp_flower_merge_check *merge,
 596                                 bool extra_fields)
 597 {
 598         struct nfp_flower_meta_tci *meta_tci;
 599         u8 *mask = flow->mask_data;
 600         u8 key_layer, match_size;
 601
 602         memset(merge, 0, sizeof(struct nfp_flower_merge_check));
 603
 604         meta_tci = (struct nfp_flower_meta_tci *)mask;
 605         key_layer = meta_tci->nfp_flow_key_layer;
 606
 607         if (key_layer & ~NFP_FLOWER_MERGE_FIELDS && !extra_fields)
 608                 return -EOPNOTSUPP;
 609
 610         merge->tci = meta_tci->tci;
 611         mask += sizeof(struct nfp_flower_meta_tci);
 612
 613         if (key_layer & NFP_FLOWER_LAYER_EXT_META)
 614                 mask += sizeof(struct nfp_flower_ext_meta);
 615
 616         mask += sizeof(struct nfp_flower_in_port);
 617
 618         if (key_layer & NFP_FLOWER_LAYER_MAC) {
 619                 match_size = sizeof(struct nfp_flower_mac_mpls);
 620                 memcpy(&merge->l2, mask, match_size);
 621                 mask += match_size;
 622         }
 623
 624         if (key_layer & NFP_FLOWER_LAYER_TP) {
 625                 match_size = sizeof(struct nfp_flower_tp_ports);
 626                 memcpy(&merge->l4, mask, match_size);
 627                 mask += match_size;
 628         }
 629
 630         if (key_layer & NFP_FLOWER_LAYER_IPV4) {
 631                 match_size = sizeof(struct nfp_flower_ipv4);
 632                 memcpy(&merge->ipv4, mask, match_size);
 633         }
 634
 635         if (key_layer & NFP_FLOWER_LAYER_IPV6) {
 636                 match_size = sizeof(struct nfp_flower_ipv6);
 637                 memcpy(&merge->ipv6, mask, match_size);
 638         }
 639
 640         return 0;
 641 }
 642
 643 static int
 644 nfp_flower_can_merge(struct nfp_fl_payload *sub_flow1,
 645                      struct nfp_fl_payload *sub_flow2)
 646 {
 647         /* Two flows can be merged if sub_flow2 only matches on bits that are
 648          * either matched by sub_flow1 or set by a sub_flow1 action. This
 649          * ensures that every packet that hits sub_flow1 and recirculates is
 650          * guaranteed to hit sub_flow2.
 651          */
 652         struct nfp_flower_merge_check sub_flow1_merge, sub_flow2_merge;
 653         int err, act_out = 0;
 654         u8 last_act_id = 0;
 655
 656         err = nfp_flower_populate_merge_match(sub_flow1, &sub_flow1_merge,
 657                                               true);
 658         if (err)
 659                 return err;
 660
 661         err = nfp_flower_populate_merge_match(sub_flow2, &sub_flow2_merge,
 662                                               false);
 663         if (err)
 664                 return err;
 665
 666         err = nfp_flower_update_merge_with_actions(sub_flow1, &sub_flow1_merge,
 667                                                    &last_act_id, &act_out);
 668         if (err)
 669                 return err;
 670
 671         /* Must only be 1 output action and it must be the last in sequence. */
 672         if (act_out != 1 || last_act_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 673                 return -EOPNOTSUPP;
 674
 675         /* Reject merge if sub_flow2 matches on something that is not matched
 676          * on or set in an action by sub_flow1.
 677          */
 678         err = bitmap_andnot(sub_flow2_merge.vals, sub_flow2_merge.vals,
 679                             sub_flow1_merge.vals,
 680                             sizeof(struct nfp_flower_merge_check) * 8);
 681         if (err)
 682                 return -EINVAL;
 683
 684         return 0;
 685 }
 686
 687 static unsigned int
 688 nfp_flower_copy_pre_actions(char *act_dst, char *act_src, int len,
 689                             bool *tunnel_act)
 690 {
 691         unsigned int act_off = 0, act_len;
 692         struct nfp_fl_act_head *a;
 693         u8 act_id = 0;
 694
 695         while (act_off < len) {
 696                 a = (struct nfp_fl_act_head *)&act_src[act_off];
 697                 act_len = a->len_lw << NFP_FL_LW_SIZ;
 698                 act_id = a->jump_id;
 699
 700                 switch (act_id) {
 701                 case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 702                         if (tunnel_act)
 703                                 *tunnel_act = true;
 704                         /* fall through */
 705                 case NFP_FL_ACTION_OPCODE_PRE_LAG:
 706                         memcpy(act_dst + act_off, act_src + act_off, act_len);
 707                         break;
 708                 default:
 709                         return act_off;
 710                 }
 711
 712                 act_off += act_len;
 713         }
 714
 715         return act_off;
 716 }
 717
 718 static int nfp_fl_verify_post_tun_acts(char *acts, int len)
 719 {
 720         struct nfp_fl_act_head *a;
 721         unsigned int act_off = 0;
 722
 723         while (act_off < len) {
 724                 a = (struct nfp_fl_act_head *)&acts[act_off];
 725                 if (a->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 726                         return -EOPNOTSUPP;
 727
 728                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 729         }
 730
 731         return 0;
 732 }
 733
 734 static int
 735 nfp_flower_merge_action(struct nfp_fl_payload *sub_flow1,
 736                         struct nfp_fl_payload *sub_flow2,
 737                         struct nfp_fl_payload *merge_flow)
 738 {
 739         unsigned int sub1_act_len, sub2_act_len, pre_off1, pre_off2;
 740         bool tunnel_act = false;
 741         char *merge_act;
 742         int err;
 743
 744         /* The last action of sub_flow1 must be output - do not merge this. */
 745         sub1_act_len = sub_flow1->meta.act_len - sizeof(struct nfp_fl_output);
 746         sub2_act_len = sub_flow2->meta.act_len;
 747
 748         if (!sub2_act_len)
 749                 return -EINVAL;
 750
 751         if (sub1_act_len + sub2_act_len > NFP_FL_MAX_A_SIZ)
 752                 return -EINVAL;
 753
 754         /* A shortcut can only be applied if there is a single action. */
 755         if (sub1_act_len)
 756                 merge_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
 757         else
 758                 merge_flow->meta.shortcut = sub_flow2->meta.shortcut;
 759
 760         merge_flow->meta.act_len = sub1_act_len + sub2_act_len;
 761         merge_act = merge_flow->action_data;
 762
 763         /* Copy any pre-actions to the start of merge flow action list. */
 764         pre_off1 = nfp_flower_copy_pre_actions(merge_act,
 765                                                sub_flow1->action_data,
 766                                                sub1_act_len, &tunnel_act);
 767         merge_act += pre_off1;
 768         sub1_act_len -= pre_off1;
 769         pre_off2 = nfp_flower_copy_pre_actions(merge_act,
 770                                                sub_flow2->action_data,
 771                                                sub2_act_len, NULL);
 772         merge_act += pre_off2;
 773         sub2_act_len -= pre_off2;
 774
 775         /* FW does a tunnel push when egressing, therefore, if sub_flow 1 pushes
 776          * a tunnel, sub_flow 2 can only have output actions for a valid merge.
 777          */
 778         if (tunnel_act) {
 779                 char *post_tun_acts = &sub_flow2->action_data[pre_off2];
 780
 781                 err = nfp_fl_verify_post_tun_acts(post_tun_acts, sub2_act_len);
 782                 if (err)
 783                         return err;
 784         }
 785
 786         /* Copy remaining actions from sub_flows 1 and 2. */
 787         memcpy(merge_act, sub_flow1->action_data + pre_off1, sub1_act_len);
 788         merge_act += sub1_act_len;
 789         memcpy(merge_act, sub_flow2->action_data + pre_off2, sub2_act_len);
 790
 791         return 0;
 792 }
 793
 794 /* Flow link code should only be accessed under RTNL. */
 795 static void nfp_flower_unlink_flow(struct nfp_fl_payload_link *link)
 796 {
 797         list_del(&link->merge_flow.list);
 798         list_del(&link->sub_flow.list);
 799         kfree(link);
 800 }
 801
 802 static void nfp_flower_unlink_flows(struct nfp_fl_payload *merge_flow,
 803                                     struct nfp_fl_payload *sub_flow)
 804 {
 805         struct nfp_fl_payload_link *link;
 806
 807         list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list)
 808                 if (link->sub_flow.flow == sub_flow) {
 809                         nfp_flower_unlink_flow(link);
 810                         return;
 811                 }
 812 }
 813
 814 static int nfp_flower_link_flows(struct nfp_fl_payload *merge_flow,
 815                                  struct nfp_fl_payload *sub_flow)
 816 {
 817         struct nfp_fl_payload_link *link;
 818
 819         link = kmalloc(sizeof(*link), GFP_KERNEL);
 820         if (!link)
 821                 return -ENOMEM;
 822
 823         link->merge_flow.flow = merge_flow;
 824         list_add_tail(&link->merge_flow.list, &merge_flow->linked_flows);
 825         link->sub_flow.flow = sub_flow;
 826         list_add_tail(&link->sub_flow.list, &sub_flow->linked_flows);
 827
 828         return 0;
 829 }
 830
 831 /**
 832  * nfp_flower_merge_offloaded_flows() - Merge 2 existing flows to single flow.
 833  * @app:        Pointer to the APP handle
 834  * @sub_flow1:  Initial flow matched to produce merge hint
 835  * @sub_flow2:  Post recirculation flow matched in merge hint
 836  *
 837  * Combines 2 flows (if valid) to a single flow, removing the initial from hw
 838  * and offloading the new, merged flow.
 839  *
 840  * Return: negative value on error, 0 in success.
 841  */
 842 int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
 843                                      struct nfp_fl_payload *sub_flow1,
 844                                      struct nfp_fl_payload *sub_flow2)
 845 {
 846         struct tc_cls_flower_offload merge_tc_off;
 847         struct nfp_flower_priv *priv = app->priv;
 848         struct netlink_ext_ack *extack = NULL;
 849         struct nfp_fl_payload *merge_flow;
 850         struct nfp_fl_key_ls merge_key_ls;
 851         int err;
 852
 853         ASSERT_RTNL();
 854
 855         extack = merge_tc_off.common.extack;
 856         if (sub_flow1 == sub_flow2 ||
 857             nfp_flower_is_merge_flow(sub_flow1) ||
 858             nfp_flower_is_merge_flow(sub_flow2))
 859                 return -EINVAL;
 860
 861         err = nfp_flower_can_merge(sub_flow1, sub_flow2);
 862         if (err)
 863                 return err;
 864
 865         merge_key_ls.key_size = sub_flow1->meta.key_len;
 866
 867         merge_flow = nfp_flower_allocate_new(&merge_key_ls);
 868         if (!merge_flow)
 869                 return -ENOMEM;
 870
 871         merge_flow->tc_flower_cookie = (unsigned long)merge_flow;
 872         merge_flow->ingress_dev = sub_flow1->ingress_dev;
 873
 874         memcpy(merge_flow->unmasked_data, sub_flow1->unmasked_data,
 875                sub_flow1->meta.key_len);
 876         memcpy(merge_flow->mask_data, sub_flow1->mask_data,
 877                sub_flow1->meta.mask_len);
 878
 879         err = nfp_flower_merge_action(sub_flow1, sub_flow2, merge_flow);
 880         if (err)
 881                 goto err_destroy_merge_flow;
 882
 883         err = nfp_flower_link_flows(merge_flow, sub_flow1);
 884         if (err)
 885                 goto err_destroy_merge_flow;
 886
 887         err = nfp_flower_link_flows(merge_flow, sub_flow2);
 888         if (err)
 889                 goto err_unlink_sub_flow1;
 890
 891         merge_tc_off.cookie = merge_flow->tc_flower_cookie;
 892         err = nfp_compile_flow_metadata(app, &merge_tc_off, merge_flow,
 893                                         merge_flow->ingress_dev, extack);
 894         if (err)
 895                 goto err_unlink_sub_flow2;
 896
 897         err = rhashtable_insert_fast(&priv->flow_table, &merge_flow->fl_node,
 898                                      nfp_flower_table_params);
 899         if (err)
 900                 goto err_release_metadata;
 901
 902         err = nfp_flower_xmit_flow(app, merge_flow,
 903                                    NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
 904         if (err)
 905                 goto err_remove_rhash;
 906
 907         merge_flow->in_hw = true;
 908         sub_flow1->in_hw = false;
 909
 910         return 0;
 911
 912 err_remove_rhash:
 913         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 914                                             &merge_flow->fl_node,
 915                                             nfp_flower_table_params));
 916 err_release_metadata:
 917         nfp_modify_flow_metadata(app, merge_flow);
 918 err_unlink_sub_flow2:
 919         nfp_flower_unlink_flows(merge_flow, sub_flow2);
 920 err_unlink_sub_flow1:
 921         nfp_flower_unlink_flows(merge_flow, sub_flow1);
 922 err_destroy_merge_flow:
 923         kfree(merge_flow->action_data);
 924         kfree(merge_flow->mask_data);
 925         kfree(merge_flow->unmasked_data);
 926         kfree(merge_flow);
 927         return err;
 928 }
 929
 930 /**
 931  * nfp_flower_add_offload() - Adds a new flow to hardware.
 932  * @app:        Pointer to the APP handle
 933  * @netdev:     netdev structure.
 934  * @flow:       TC flower classifier offload structure.
 935  *
 936  * Adds a new flow to the repeated hash structure and action payload.
 937  *
 938  * Return: negative value on error, 0 if configured successfully.
 939  */
 940 static int
 941 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 942                        struct tc_cls_flower_offload *flow)
 943 {
 944         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 945         struct nfp_flower_priv *priv = app->priv;
 946         struct netlink_ext_ack *extack = NULL;
 947         struct nfp_fl_payload *flow_pay;
 948         struct nfp_fl_key_ls *key_layer;
 949         struct nfp_port *port = NULL;
 950         int err;
 951
 952         extack = flow->common.extack;
 953         if (nfp_netdev_is_nfp_repr(netdev))
 954                 port = nfp_port_from_netdev(netdev);
 955
 956         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 957         if (!key_layer)
 958                 return -ENOMEM;
 959
 960         err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
 961                                               &tun_type, extack);
 962         if (err)
 963                 goto err_free_key_ls;
 964
 965         flow_pay = nfp_flower_allocate_new(key_layer);
 966         if (!flow_pay) {
 967                 err = -ENOMEM;
 968                 goto err_free_key_ls;
 969         }
 970
 971         err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
 972                                             flow_pay, tun_type, extack);
 973         if (err)
 974                 goto err_destroy_flow;
 975
 976         err = nfp_flower_compile_action(app, flow, netdev, flow_pay, extack);
 977         if (err)
 978                 goto err_destroy_flow;
 979
 980         err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev, extack);
 981         if (err)
 982                 goto err_destroy_flow;
 983
 984         flow_pay->tc_flower_cookie = flow->cookie;
 985         err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
 986                                      nfp_flower_table_params);
 987         if (err) {
 988                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot insert flow into tables for offloads");
 989                 goto err_release_metadata;
 990         }
 991
 992         err = nfp_flower_xmit_flow(app, flow_pay,
 993                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 994         if (err)
 995                 goto err_remove_rhash;
 996
 997         if (port)
 998                 port->tc_offload_cnt++;
 999
1000         flow_pay->in_hw = true;
1001
1002         /* Deallocate flow payload when flower rule has been destroyed. */
1003         kfree(key_layer);
1004
1005         return 0;
1006
1007 err_remove_rhash:
1008         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1009                                             &flow_pay->fl_node,
1010                                             nfp_flower_table_params));
1011 err_release_metadata:
1012         nfp_modify_flow_metadata(app, flow_pay);
1013 err_destroy_flow:
1014         kfree(flow_pay->action_data);
1015         kfree(flow_pay->mask_data);
1016         kfree(flow_pay->unmasked_data);
1017         kfree(flow_pay);
1018 err_free_key_ls:
1019         kfree(key_layer);
1020         return err;
1021 }
1022
1023 static void
1024 nfp_flower_remove_merge_flow(struct nfp_app *app,
1025                              struct nfp_fl_payload *del_sub_flow,
1026                              struct nfp_fl_payload *merge_flow)
1027 {
1028         struct nfp_flower_priv *priv = app->priv;
1029         struct nfp_fl_payload_link *link, *temp;
1030         struct nfp_fl_payload *origin;
1031         bool mod = false;
1032         int err;
1033
1034         link = list_first_entry(&merge_flow->linked_flows,
1035                                 struct nfp_fl_payload_link, merge_flow.list);
1036         origin = link->sub_flow.flow;
1037
1038         /* Re-add rule the merge had overwritten if it has not been deleted. */
1039         if (origin != del_sub_flow)
1040                 mod = true;
1041
1042         err = nfp_modify_flow_metadata(app, merge_flow);
1043         if (err) {
1044                 nfp_flower_cmsg_warn(app, "Metadata fail for merge flow delete.\n");
1045                 goto err_free_links;
1046         }
1047
1048         if (!mod) {
1049                 err = nfp_flower_xmit_flow(app, merge_flow,
1050                                            NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1051                 if (err) {
1052                         nfp_flower_cmsg_warn(app, "Failed to delete merged flow.\n");
1053                         goto err_free_links;
1054                 }
1055         } else {
1056                 __nfp_modify_flow_metadata(priv, origin);
1057                 err = nfp_flower_xmit_flow(app, origin,
1058                                            NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
1059                 if (err)
1060                         nfp_flower_cmsg_warn(app, "Failed to revert merge flow.\n");
1061                 origin->in_hw = true;
1062         }
1063
1064 err_free_links:
1065         /* Clean any links connected with the merged flow. */
1066         list_for_each_entry_safe(link, temp, &merge_flow->linked_flows,
1067                                  merge_flow.list)
1068                 nfp_flower_unlink_flow(link);
1069
1070         kfree(merge_flow->action_data);
1071         kfree(merge_flow->mask_data);
1072         kfree(merge_flow->unmasked_data);
1073         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1074                                             &merge_flow->fl_node,
1075                                             nfp_flower_table_params));
1076         kfree_rcu(merge_flow, rcu);
1077 }
1078
1079 static void
1080 nfp_flower_del_linked_merge_flows(struct nfp_app *app,
1081                                   struct nfp_fl_payload *sub_flow)
1082 {
1083         struct nfp_fl_payload_link *link, *temp;
1084
1085         /* Remove any merge flow formed from the deleted sub_flow. */
1086         list_for_each_entry_safe(link, temp, &sub_flow->linked_flows,
1087                                  sub_flow.list)
1088                 nfp_flower_remove_merge_flow(app, sub_flow,
1089                                              link->merge_flow.flow);
1090 }
1091
1092 /**
1093  * nfp_flower_del_offload() - Removes a flow from hardware.
1094  * @app:        Pointer to the APP handle
1095  * @netdev:     netdev structure.
1096  * @flow:       TC flower classifier offload structure
1097  *
1098  * Removes a flow from the repeated hash structure and clears the
1099  * action payload. Any flows merged from this are also deleted.
1100  *
1101  * Return: negative value on error, 0 if removed successfully.
1102  */
1103 static int
1104 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
1105                        struct tc_cls_flower_offload *flow)
1106 {
1107         struct nfp_flower_priv *priv = app->priv;
1108         struct netlink_ext_ack *extack = NULL;
1109         struct nfp_fl_payload *nfp_flow;
1110         struct nfp_port *port = NULL;
1111         int err;
1112
1113         extack = flow->common.extack;
1114         if (nfp_netdev_is_nfp_repr(netdev))
1115                 port = nfp_port_from_netdev(netdev);
1116
1117         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1118         if (!nfp_flow) {
1119                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot remove flow that does not exist");
1120                 return -ENOENT;
1121         }
1122
1123         err = nfp_modify_flow_metadata(app, nfp_flow);
1124         if (err)
1125                 goto err_free_merge_flow;
1126
1127         if (nfp_flow->nfp_tun_ipv4_addr)
1128                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
1129
1130         if (!nfp_flow->in_hw) {
1131                 err = 0;
1132                 goto err_free_merge_flow;
1133         }
1134
1135         err = nfp_flower_xmit_flow(app, nfp_flow,
1136                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1137         /* Fall through on error. */
1138
1139 err_free_merge_flow:
1140         nfp_flower_del_linked_merge_flows(app, nfp_flow);
1141         if (port)
1142                 port->tc_offload_cnt--;
1143         kfree(nfp_flow->action_data);
1144         kfree(nfp_flow->mask_data);
1145         kfree(nfp_flow->unmasked_data);
1146         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1147                                             &nfp_flow->fl_node,
1148                                             nfp_flower_table_params));
1149         kfree_rcu(nfp_flow, rcu);
1150         return err;
1151 }
1152
1153 static void
1154 __nfp_flower_update_merge_stats(struct nfp_app *app,
1155                                 struct nfp_fl_payload *merge_flow)
1156 {
1157         struct nfp_flower_priv *priv = app->priv;
1158         struct nfp_fl_payload_link *link;
1159         struct nfp_fl_payload *sub_flow;
1160         u64 pkts, bytes, used;
1161         u32 ctx_id;
1162
1163         ctx_id = be32_to_cpu(merge_flow->meta.host_ctx_id);
1164         pkts = priv->stats[ctx_id].pkts;
1165         /* Do not cycle subflows if no stats to distribute. */
1166         if (!pkts)
1167                 return;
1168         bytes = priv->stats[ctx_id].bytes;
1169         used = priv->stats[ctx_id].used;
1170
1171         /* Reset stats for the merge flow. */
1172         priv->stats[ctx_id].pkts = 0;
1173         priv->stats[ctx_id].bytes = 0;
1174
1175         /* The merge flow has received stats updates from firmware.
1176          * Distribute these stats to all subflows that form the merge.
1177          * The stats will collected from TC via the subflows.
1178          */
1179         list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list) {
1180                 sub_flow = link->sub_flow.flow;
1181                 ctx_id = be32_to_cpu(sub_flow->meta.host_ctx_id);
1182                 priv->stats[ctx_id].pkts += pkts;
1183                 priv->stats[ctx_id].bytes += bytes;
1184                 max_t(u64, priv->stats[ctx_id].used, used);
1185         }
1186 }
1187
1188 static void
1189 nfp_flower_update_merge_stats(struct nfp_app *app,
1190                               struct nfp_fl_payload *sub_flow)
1191 {
1192         struct nfp_fl_payload_link *link;
1193
1194         /* Get merge flows that the subflow forms to distribute their stats. */
1195         list_for_each_entry(link, &sub_flow->linked_flows, sub_flow.list)
1196                 __nfp_flower_update_merge_stats(app, link->merge_flow.flow);
1197 }
1198
1199 /**
1200  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
1201  * @app:        Pointer to the APP handle
1202  * @netdev:     Netdev structure.
1203  * @flow:       TC flower classifier offload structure
1204  *
1205  * Populates a flow statistics structure which which corresponds to a
1206  * specific flow.
1207  *
1208  * Return: negative value on error, 0 if stats populated successfully.
1209  */
1210 static int
1211 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
1212                      struct tc_cls_flower_offload *flow)
1213 {
1214         struct nfp_flower_priv *priv = app->priv;
1215         struct netlink_ext_ack *extack = NULL;
1216         struct nfp_fl_payload *nfp_flow;
1217         u32 ctx_id;
1218
1219         extack = flow->common.extack;
1220         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1221         if (!nfp_flow) {
1222                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot dump stats for flow that does not exist");
1223                 return -EINVAL;
1224         }
1225
1226         ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
1227
1228         spin_lock_bh(&priv->stats_lock);
1229         /* If request is for a sub_flow, update stats from merged flows. */
1230         if (!list_empty(&nfp_flow->linked_flows))
1231                 nfp_flower_update_merge_stats(app, nfp_flow);
1232
1233         flow_stats_update(&flow->stats, priv->stats[ctx_id].bytes,
1234                           priv->stats[ctx_id].pkts, priv->stats[ctx_id].used);
1235
1236         priv->stats[ctx_id].pkts = 0;
1237         priv->stats[ctx_id].bytes = 0;
1238         spin_unlock_bh(&priv->stats_lock);
1239
1240         return 0;
1241 }
1242
1243 static int
1244 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
1245                         struct tc_cls_flower_offload *flower)
1246 {
1247         if (!eth_proto_is_802_3(flower->common.protocol))
1248                 return -EOPNOTSUPP;
1249
1250         switch (flower->command) {
1251         case TC_CLSFLOWER_REPLACE:
1252                 return nfp_flower_add_offload(app, netdev, flower);
1253         case TC_CLSFLOWER_DESTROY:
1254                 return nfp_flower_del_offload(app, netdev, flower);
1255         case TC_CLSFLOWER_STATS:
1256                 return nfp_flower_get_stats(app, netdev, flower);
1257         default:
1258                 return -EOPNOTSUPP;
1259         }
1260 }
1261
1262 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
1263                                         void *type_data, void *cb_priv)
1264 {
1265         struct nfp_repr *repr = cb_priv;
1266
1267         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
1268                 return -EOPNOTSUPP;
1269
1270         switch (type) {
1271         case TC_SETUP_CLSFLOWER:
1272                 return nfp_flower_repr_offload(repr->app, repr->netdev,
1273                                                type_data);
1274         case TC_SETUP_CLSMATCHALL:
1275                 return nfp_flower_setup_qos_offload(repr->app, repr->netdev,
1276                                                     type_data);
1277         default:
1278                 return -EOPNOTSUPP;
1279         }
1280 }
1281
1282 static int nfp_flower_setup_tc_block(struct net_device *netdev,
1283                                      struct tc_block_offload *f)
1284 {
1285         struct nfp_repr *repr = netdev_priv(netdev);
1286         struct nfp_flower_repr_priv *repr_priv;
1287
1288         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1289                 return -EOPNOTSUPP;
1290
1291         repr_priv = repr->app_priv;
1292         repr_priv->block_shared = tcf_block_shared(f->block);
1293
1294         switch (f->command) {
1295         case TC_BLOCK_BIND:
1296                 return tcf_block_cb_register(f->block,
1297                                              nfp_flower_setup_tc_block_cb,
1298                                              repr, repr, f->extack);
1299         case TC_BLOCK_UNBIND:
1300                 tcf_block_cb_unregister(f->block,
1301                                         nfp_flower_setup_tc_block_cb,
1302                                         repr);
1303                 return 0;
1304         default:
1305                 return -EOPNOTSUPP;
1306         }
1307 }
1308
1309 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
1310                         enum tc_setup_type type, void *type_data)
1311 {
1312         switch (type) {
1313         case TC_SETUP_BLOCK:
1314                 return nfp_flower_setup_tc_block(netdev, type_data);
1315         default:
1316                 return -EOPNOTSUPP;
1317         }
1318 }
1319
1320 struct nfp_flower_indr_block_cb_priv {
1321         struct net_device *netdev;
1322         struct nfp_app *app;
1323         struct list_head list;
1324 };
1325
1326 static struct nfp_flower_indr_block_cb_priv *
1327 nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
1328                                      struct net_device *netdev)
1329 {
1330         struct nfp_flower_indr_block_cb_priv *cb_priv;
1331         struct nfp_flower_priv *priv = app->priv;
1332
1333         /* All callback list access should be protected by RTNL. */
1334         ASSERT_RTNL();
1335
1336         list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
1337                 if (cb_priv->netdev == netdev)
1338                         return cb_priv;
1339
1340         return NULL;
1341 }
1342
1343 static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
1344                                           void *type_data, void *cb_priv)
1345 {
1346         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
1347         struct tc_cls_flower_offload *flower = type_data;
1348
1349         if (flower->common.chain_index)
1350                 return -EOPNOTSUPP;
1351
1352         switch (type) {
1353         case TC_SETUP_CLSFLOWER:
1354                 return nfp_flower_repr_offload(priv->app, priv->netdev,
1355                                                type_data);
1356         default:
1357                 return -EOPNOTSUPP;
1358         }
1359 }
1360
1361 static int
1362 nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
1363                                struct tc_block_offload *f)
1364 {
1365         struct nfp_flower_indr_block_cb_priv *cb_priv;
1366         struct nfp_flower_priv *priv = app->priv;
1367         int err;
1368
1369         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1370             !(f->binder_type == TCF_BLOCK_BINDER_TYPE_CLSACT_EGRESS &&
1371               nfp_flower_internal_port_can_offload(app, netdev)))
1372                 return -EOPNOTSUPP;
1373
1374         switch (f->command) {
1375         case TC_BLOCK_BIND:
1376                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
1377                 if (!cb_priv)
1378                         return -ENOMEM;
1379
1380                 cb_priv->netdev = netdev;
1381                 cb_priv->app = app;
1382                 list_add(&cb_priv->list, &priv->indr_block_cb_priv);
1383
1384                 err = tcf_block_cb_register(f->block,
1385                                             nfp_flower_setup_indr_block_cb,
1386                                             cb_priv, cb_priv, f->extack);
1387                 if (err) {
1388                         list_del(&cb_priv->list);
1389                         kfree(cb_priv);
1390                 }
1391
1392                 return err;
1393         case TC_BLOCK_UNBIND:
1394                 cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
1395                 if (!cb_priv)
1396                         return -ENOENT;
1397
1398                 tcf_block_cb_unregister(f->block,
1399                                         nfp_flower_setup_indr_block_cb,
1400                                         cb_priv);
1401                 list_del(&cb_priv->list);
1402                 kfree(cb_priv);
1403
1404                 return 0;
1405         default:
1406                 return -EOPNOTSUPP;
1407         }
1408         return 0;
1409 }
1410
1411 static int
1412 nfp_flower_indr_setup_tc_cb(struct net_device *netdev, void *cb_priv,
1413                             enum tc_setup_type type, void *type_data)
1414 {
1415         switch (type) {
1416         case TC_SETUP_BLOCK:
1417                 return nfp_flower_setup_indr_tc_block(netdev, cb_priv,
1418                                                       type_data);
1419         default:
1420                 return -EOPNOTSUPP;
1421         }
1422 }
1423
1424 int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
1425                                        struct net_device *netdev,
1426                                        unsigned long event)
1427 {
1428         int err;
1429
1430         if (!nfp_fl_is_netdev_to_offload(netdev))
1431                 return NOTIFY_OK;
1432
1433         if (event == NETDEV_REGISTER) {
1434                 err = __tc_indr_block_cb_register(netdev, app,
1435                                                   nfp_flower_indr_setup_tc_cb,
1436                                                   app);
1437                 if (err)
1438                         nfp_flower_cmsg_warn(app,
1439                                              "Indirect block reg failed - %s\n",
1440                                              netdev->name);
1441         } else if (event == NETDEV_UNREGISTER) {
1442                 __tc_indr_block_cb_unregister(netdev,
1443                                               nfp_flower_indr_setup_tc_cb, app);
1444         }
1445
1446         return NOTIFY_OK;
1447 }