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