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
  57 #define NFP_FLOWER_MERGE_FIELDS \
  58         (NFP_FLOWER_LAYER_PORT | \
  59          NFP_FLOWER_LAYER_MAC | \
  60          NFP_FLOWER_LAYER_TP | \
  61          NFP_FLOWER_LAYER_IPV4 | \
  62          NFP_FLOWER_LAYER_IPV6)
  63
  64 struct nfp_flower_merge_check {
  65         union {
  66                 struct {
  67                         __be16 tci;
  68                         struct nfp_flower_mac_mpls l2;
  69                         struct nfp_flower_tp_ports l4;
  70                         union {
  71                                 struct nfp_flower_ipv4 ipv4;
  72                                 struct nfp_flower_ipv6 ipv6;
  73                         };
  74                 };
  75                 unsigned long vals[8];
  76         };
  77 };
  78
  79 static int
  80 nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
  81                      u8 mtype)
  82 {
  83         u32 meta_len, key_len, mask_len, act_len, tot_len;
  84         struct sk_buff *skb;
  85         unsigned char *msg;
  86
  87         meta_len =  sizeof(struct nfp_fl_rule_metadata);
  88         key_len = nfp_flow->meta.key_len;
  89         mask_len = nfp_flow->meta.mask_len;
  90         act_len = nfp_flow->meta.act_len;
  91
  92         tot_len = meta_len + key_len + mask_len + act_len;
  93
  94         /* Convert to long words as firmware expects
  95          * lengths in units of NFP_FL_LW_SIZ.
  96          */
  97         nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
  98         nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
  99         nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;
 100
 101         skb = nfp_flower_cmsg_alloc(app, tot_len, mtype, GFP_KERNEL);
 102         if (!skb)
 103                 return -ENOMEM;
 104
 105         msg = nfp_flower_cmsg_get_data(skb);
 106         memcpy(msg, &nfp_flow->meta, meta_len);
 107         memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
 108         memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
 109         memcpy(&msg[meta_len + key_len + mask_len],
 110                nfp_flow->action_data, act_len);
 111
 112         /* Convert back to bytes as software expects
 113          * lengths in units of bytes.
 114          */
 115         nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
 116         nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
 117         nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
 118
 119         nfp_ctrl_tx(app->ctrl, skb);
 120
 121         return 0;
 122 }
 123
 124 static bool nfp_flower_check_higher_than_mac(struct flow_cls_offload *f)
 125 {
 126         struct flow_rule *rule = flow_cls_offload_flow_rule(f);
 127
 128         return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 129                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 130                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 131                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 132 }
 133
 134 static bool nfp_flower_check_higher_than_l3(struct flow_cls_offload *f)
 135 {
 136         struct flow_rule *rule = flow_cls_offload_flow_rule(f);
 137
 138         return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 139                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 140 }
 141
 142 static int
 143 nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
 144                           u32 *key_layer_two, int *key_size,
 145                           struct netlink_ext_ack *extack)
 146 {
 147         if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY) {
 148                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: geneve options exceed maximum length");
 149                 return -EOPNOTSUPP;
 150         }
 151
 152         if (enc_opts->len > 0) {
 153                 *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 154                 *key_size += sizeof(struct nfp_flower_geneve_options);
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int
 161 nfp_flower_calc_udp_tun_layer(struct flow_dissector_key_ports *enc_ports,
 162                               struct flow_dissector_key_enc_opts *enc_op,
 163                               u32 *key_layer_two, u8 *key_layer, int *key_size,
 164                               struct nfp_flower_priv *priv,
 165                               enum nfp_flower_tun_type *tun_type,
 166                               struct netlink_ext_ack *extack)
 167 {
 168         int err;
 169
 170         switch (enc_ports->dst) {
 171         case htons(IANA_VXLAN_UDP_PORT):
 172                 *tun_type = NFP_FL_TUNNEL_VXLAN;
 173                 *key_layer |= NFP_FLOWER_LAYER_VXLAN;
 174                 *key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 175
 176                 if (enc_op) {
 177                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on vxlan tunnels");
 178                         return -EOPNOTSUPP;
 179                 }
 180                 break;
 181         case htons(GENEVE_UDP_PORT):
 182                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE)) {
 183                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve offload");
 184                         return -EOPNOTSUPP;
 185                 }
 186                 *tun_type = NFP_FL_TUNNEL_GENEVE;
 187                 *key_layer |= NFP_FLOWER_LAYER_EXT_META;
 188                 *key_size += sizeof(struct nfp_flower_ext_meta);
 189                 *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 190                 *key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 191
 192                 if (!enc_op)
 193                         break;
 194                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT)) {
 195                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support geneve option offload");
 196                         return -EOPNOTSUPP;
 197                 }
 198                 err = nfp_flower_calc_opt_layer(enc_op, key_layer_two,
 199                                                 key_size, extack);
 200                 if (err)
 201                         return err;
 202                 break;
 203         default:
 204                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel type unknown");
 205                 return -EOPNOTSUPP;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int
 212 nfp_flower_calculate_key_layers(struct nfp_app *app,
 213                                 struct net_device *netdev,
 214                                 struct nfp_fl_key_ls *ret_key_ls,
 215                                 struct flow_cls_offload *flow,
 216                                 enum nfp_flower_tun_type *tun_type,
 217                                 struct netlink_ext_ack *extack)
 218 {
 219         struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
 220         struct flow_dissector *dissector = rule->match.dissector;
 221         struct flow_match_basic basic = { NULL, NULL};
 222         struct nfp_flower_priv *priv = app->priv;
 223         u32 key_layer_two;
 224         u8 key_layer;
 225         int key_size;
 226         int err;
 227
 228         if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR) {
 229                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match not supported");
 230                 return -EOPNOTSUPP;
 231         }
 232
 233         /* If any tun dissector is used then the required set must be used. */
 234         if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 235             (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 236             != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R) {
 237                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: tunnel match not supported");
 238                 return -EOPNOTSUPP;
 239         }
 240
 241         key_layer_two = 0;
 242         key_layer = NFP_FLOWER_LAYER_PORT;
 243         key_size = sizeof(struct nfp_flower_meta_tci) +
 244                    sizeof(struct nfp_flower_in_port);
 245
 246         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 247             flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
 248                 key_layer |= NFP_FLOWER_LAYER_MAC;
 249                 key_size += sizeof(struct nfp_flower_mac_mpls);
 250         }
 251
 252         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
 253                 struct flow_match_vlan vlan;
 254
 255                 flow_rule_match_vlan(rule, &vlan);
 256                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 257                     vlan.key->vlan_priority) {
 258                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: loaded firmware does not support VLAN PCP offload");
 259                         return -EOPNOTSUPP;
 260                 }
 261         }
 262
 263         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 264                 struct flow_match_enc_opts enc_op = { NULL, NULL };
 265                 struct flow_match_ipv4_addrs ipv4_addrs;
 266                 struct flow_match_control enc_ctl;
 267                 struct flow_match_ports enc_ports;
 268
 269                 flow_rule_match_enc_control(rule, &enc_ctl);
 270
 271                 if (enc_ctl.mask->addr_type != 0xffff) {
 272                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: wildcarded protocols on tunnels are not supported");
 273                         return -EOPNOTSUPP;
 274                 }
 275                 if (enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
 276                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only IPv4 tunnels are supported");
 277                         return -EOPNOTSUPP;
 278                 }
 279
 280                 /* These fields are already verified as used. */
 281                 flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
 282                 if (ipv4_addrs.mask->dst != cpu_to_be32(~0)) {
 283                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match IPv4 destination address is supported");
 284                         return -EOPNOTSUPP;
 285                 }
 286
 287                 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
 288                         flow_rule_match_enc_opts(rule, &enc_op);
 289
 290
 291                 if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
 292                         /* check if GRE, which has no enc_ports */
 293                         if (netif_is_gretap(netdev)) {
 294                                 *tun_type = NFP_FL_TUNNEL_GRE;
 295                                 key_layer |= NFP_FLOWER_LAYER_EXT_META;
 296                                 key_size += sizeof(struct nfp_flower_ext_meta);
 297                                 key_layer_two |= NFP_FLOWER_LAYER2_GRE;
 298                                 key_size +=
 299                                         sizeof(struct nfp_flower_ipv4_gre_tun);
 300
 301                                 if (enc_op.key) {
 302                                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: encap options not supported on GRE tunnels");
 303                                         return -EOPNOTSUPP;
 304                                 }
 305                         } else {
 306                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: an exact match on L4 destination port is required for non-GRE tunnels");
 307                                 return -EOPNOTSUPP;
 308                         }
 309                 } else {
 310                         flow_rule_match_enc_ports(rule, &enc_ports);
 311                         if (enc_ports.mask->dst != cpu_to_be16(~0)) {
 312                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: only an exact match L4 destination port is supported");
 313                                 return -EOPNOTSUPP;
 314                         }
 315
 316                         err = nfp_flower_calc_udp_tun_layer(enc_ports.key,
 317                                                             enc_op.key,
 318                                                             &key_layer_two,
 319                                                             &key_layer,
 320                                                             &key_size, priv,
 321                                                             tun_type, extack);
 322                         if (err)
 323                                 return err;
 324
 325                         /* Ensure the ingress netdev matches the expected
 326                          * tun type.
 327                          */
 328                         if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type)) {
 329                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ingress netdev does not match the expected tunnel type");
 330                                 return -EOPNOTSUPP;
 331                         }
 332                 }
 333         }
 334
 335         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
 336                 flow_rule_match_basic(rule, &basic);
 337
 338         if (basic.mask && basic.mask->n_proto) {
 339                 /* Ethernet type is present in the key. */
 340                 switch (basic.key->n_proto) {
 341                 case cpu_to_be16(ETH_P_IP):
 342                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 343                         key_size += sizeof(struct nfp_flower_ipv4);
 344                         break;
 345
 346                 case cpu_to_be16(ETH_P_IPV6):
 347                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 348                         key_size += sizeof(struct nfp_flower_ipv6);
 349                         break;
 350
 351                 /* Currently we do not offload ARP
 352                  * because we rely on it to get to the host.
 353                  */
 354                 case cpu_to_be16(ETH_P_ARP):
 355                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: ARP not supported");
 356                         return -EOPNOTSUPP;
 357
 358                 case cpu_to_be16(ETH_P_MPLS_UC):
 359                 case cpu_to_be16(ETH_P_MPLS_MC):
 360                         if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 361                                 key_layer |= NFP_FLOWER_LAYER_MAC;
 362                                 key_size += sizeof(struct nfp_flower_mac_mpls);
 363                         }
 364                         break;
 365
 366                 /* Will be included in layer 2. */
 367                 case cpu_to_be16(ETH_P_8021Q):
 368                         break;
 369
 370                 default:
 371                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on given EtherType is not supported");
 372                         return -EOPNOTSUPP;
 373                 }
 374         } else if (nfp_flower_check_higher_than_mac(flow)) {
 375                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match above L2 without specified EtherType");
 376                 return -EOPNOTSUPP;
 377         }
 378
 379         if (basic.mask && basic.mask->ip_proto) {
 380                 switch (basic.key->ip_proto) {
 381                 case IPPROTO_TCP:
 382                 case IPPROTO_UDP:
 383                 case IPPROTO_SCTP:
 384                 case IPPROTO_ICMP:
 385                 case IPPROTO_ICMPV6:
 386                         key_layer |= NFP_FLOWER_LAYER_TP;
 387                         key_size += sizeof(struct nfp_flower_tp_ports);
 388                         break;
 389                 }
 390         }
 391
 392         if (!(key_layer & NFP_FLOWER_LAYER_TP) &&
 393             nfp_flower_check_higher_than_l3(flow)) {
 394                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match on L4 information without specified IP protocol type");
 395                 return -EOPNOTSUPP;
 396         }
 397
 398         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
 399                 struct flow_match_tcp tcp;
 400                 u32 tcp_flags;
 401
 402                 flow_rule_match_tcp(rule, &tcp);
 403                 tcp_flags = be16_to_cpu(tcp.key->flags);
 404
 405                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS) {
 406                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: no match support for selected TCP flags");
 407                         return -EOPNOTSUPP;
 408                 }
 409
 410                 /* We only support PSH and URG flags when either
 411                  * FIN, SYN or RST is present as well.
 412                  */
 413                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 414                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST))) {
 415                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: PSH and URG is only supported when used with FIN, SYN or RST");
 416                         return -EOPNOTSUPP;
 417                 }
 418
 419                 /* We need to store TCP flags in the either the IPv4 or IPv6 key
 420                  * space, thus we need to ensure we include a IPv4/IPv6 key
 421                  * layer if we have not done so already.
 422                  */
 423                 if (!basic.key) {
 424                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on L3 protocol");
 425                         return -EOPNOTSUPP;
 426                 }
 427
 428                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 429                     !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
 430                         switch (basic.key->n_proto) {
 431                         case cpu_to_be16(ETH_P_IP):
 432                                 key_layer |= NFP_FLOWER_LAYER_IPV4;
 433                                 key_size += sizeof(struct nfp_flower_ipv4);
 434                                 break;
 435
 436                         case cpu_to_be16(ETH_P_IPV6):
 437                                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 438                                 key_size += sizeof(struct nfp_flower_ipv6);
 439                                 break;
 440
 441                         default:
 442                                 NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on TCP flags requires a match on IPv4/IPv6");
 443                                 return -EOPNOTSUPP;
 444                         }
 445                 }
 446         }
 447
 448         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 449                 struct flow_match_control ctl;
 450
 451                 flow_rule_match_control(rule, &ctl);
 452                 if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS) {
 453                         NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on unknown control flag");
 454                         return -EOPNOTSUPP;
 455                 }
 456         }
 457
 458         ret_key_ls->key_layer = key_layer;
 459         ret_key_ls->key_layer_two = key_layer_two;
 460         ret_key_ls->key_size = key_size;
 461
 462         return 0;
 463 }
 464
 465 static struct nfp_fl_payload *
 466 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 467 {
 468         struct nfp_fl_payload *flow_pay;
 469
 470         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 471         if (!flow_pay)
 472                 return NULL;
 473
 474         flow_pay->meta.key_len = key_layer->key_size;
 475         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 476         if (!flow_pay->unmasked_data)
 477                 goto err_free_flow;
 478
 479         flow_pay->meta.mask_len = key_layer->key_size;
 480         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 481         if (!flow_pay->mask_data)
 482                 goto err_free_unmasked;
 483
 484         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 485         if (!flow_pay->action_data)
 486                 goto err_free_mask;
 487
 488         flow_pay->nfp_tun_ipv4_addr = 0;
 489         flow_pay->meta.flags = 0;
 490         INIT_LIST_HEAD(&flow_pay->linked_flows);
 491         flow_pay->in_hw = false;
 492         flow_pay->pre_tun_rule.dev = NULL;
 493
 494         return flow_pay;
 495
 496 err_free_mask:
 497         kfree(flow_pay->mask_data);
 498 err_free_unmasked:
 499         kfree(flow_pay->unmasked_data);
 500 err_free_flow:
 501         kfree(flow_pay);
 502         return NULL;
 503 }
 504
 505 static int
 506 nfp_flower_update_merge_with_actions(struct nfp_fl_payload *flow,
 507                                      struct nfp_flower_merge_check *merge,
 508                                      u8 *last_act_id, int *act_out)
 509 {
 510         struct nfp_fl_set_ipv6_tc_hl_fl *ipv6_tc_hl_fl;
 511         struct nfp_fl_set_ip4_ttl_tos *ipv4_ttl_tos;
 512         struct nfp_fl_set_ip4_addrs *ipv4_add;
 513         struct nfp_fl_set_ipv6_addr *ipv6_add;
 514         struct nfp_fl_push_vlan *push_vlan;
 515         struct nfp_fl_set_tport *tport;
 516         struct nfp_fl_set_eth *eth;
 517         struct nfp_fl_act_head *a;
 518         unsigned int act_off = 0;
 519         u8 act_id = 0;
 520         u8 *ports;
 521         int i;
 522
 523         while (act_off < flow->meta.act_len) {
 524                 a = (struct nfp_fl_act_head *)&flow->action_data[act_off];
 525                 act_id = a->jump_id;
 526
 527                 switch (act_id) {
 528                 case NFP_FL_ACTION_OPCODE_OUTPUT:
 529                         if (act_out)
 530                                 (*act_out)++;
 531                         break;
 532                 case NFP_FL_ACTION_OPCODE_PUSH_VLAN:
 533                         push_vlan = (struct nfp_fl_push_vlan *)a;
 534                         if (push_vlan->vlan_tci)
 535                                 merge->tci = cpu_to_be16(0xffff);
 536                         break;
 537                 case NFP_FL_ACTION_OPCODE_POP_VLAN:
 538                         merge->tci = cpu_to_be16(0);
 539                         break;
 540                 case NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL:
 541                         /* New tunnel header means l2 to l4 can be matched. */
 542                         eth_broadcast_addr(&merge->l2.mac_dst[0]);
 543                         eth_broadcast_addr(&merge->l2.mac_src[0]);
 544                         memset(&merge->l4, 0xff,
 545                                sizeof(struct nfp_flower_tp_ports));
 546                         memset(&merge->ipv4, 0xff,
 547                                sizeof(struct nfp_flower_ipv4));
 548                         break;
 549                 case NFP_FL_ACTION_OPCODE_SET_ETHERNET:
 550                         eth = (struct nfp_fl_set_eth *)a;
 551                         for (i = 0; i < ETH_ALEN; i++)
 552                                 merge->l2.mac_dst[i] |= eth->eth_addr_mask[i];
 553                         for (i = 0; i < ETH_ALEN; i++)
 554                                 merge->l2.mac_src[i] |=
 555                                         eth->eth_addr_mask[ETH_ALEN + i];
 556                         break;
 557                 case NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS:
 558                         ipv4_add = (struct nfp_fl_set_ip4_addrs *)a;
 559                         merge->ipv4.ipv4_src |= ipv4_add->ipv4_src_mask;
 560                         merge->ipv4.ipv4_dst |= ipv4_add->ipv4_dst_mask;
 561                         break;
 562                 case NFP_FL_ACTION_OPCODE_SET_IPV4_TTL_TOS:
 563                         ipv4_ttl_tos = (struct nfp_fl_set_ip4_ttl_tos *)a;
 564                         merge->ipv4.ip_ext.ttl |= ipv4_ttl_tos->ipv4_ttl_mask;
 565                         merge->ipv4.ip_ext.tos |= ipv4_ttl_tos->ipv4_tos_mask;
 566                         break;
 567                 case NFP_FL_ACTION_OPCODE_SET_IPV6_SRC:
 568                         ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 569                         for (i = 0; i < 4; i++)
 570                                 merge->ipv6.ipv6_src.in6_u.u6_addr32[i] |=
 571                                         ipv6_add->ipv6[i].mask;
 572                         break;
 573                 case NFP_FL_ACTION_OPCODE_SET_IPV6_DST:
 574                         ipv6_add = (struct nfp_fl_set_ipv6_addr *)a;
 575                         for (i = 0; i < 4; i++)
 576                                 merge->ipv6.ipv6_dst.in6_u.u6_addr32[i] |=
 577                                         ipv6_add->ipv6[i].mask;
 578                         break;
 579                 case NFP_FL_ACTION_OPCODE_SET_IPV6_TC_HL_FL:
 580                         ipv6_tc_hl_fl = (struct nfp_fl_set_ipv6_tc_hl_fl *)a;
 581                         merge->ipv6.ip_ext.ttl |=
 582                                 ipv6_tc_hl_fl->ipv6_hop_limit_mask;
 583                         merge->ipv6.ip_ext.tos |= ipv6_tc_hl_fl->ipv6_tc_mask;
 584                         merge->ipv6.ipv6_flow_label_exthdr |=
 585                                 ipv6_tc_hl_fl->ipv6_label_mask;
 586                         break;
 587                 case NFP_FL_ACTION_OPCODE_SET_UDP:
 588                 case NFP_FL_ACTION_OPCODE_SET_TCP:
 589                         tport = (struct nfp_fl_set_tport *)a;
 590                         ports = (u8 *)&merge->l4.port_src;
 591                         for (i = 0; i < 4; i++)
 592                                 ports[i] |= tport->tp_port_mask[i];
 593                         break;
 594                 case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 595                 case NFP_FL_ACTION_OPCODE_PRE_LAG:
 596                 case NFP_FL_ACTION_OPCODE_PUSH_GENEVE:
 597                         break;
 598                 default:
 599                         return -EOPNOTSUPP;
 600                 }
 601
 602                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 603         }
 604
 605         if (last_act_id)
 606                 *last_act_id = act_id;
 607
 608         return 0;
 609 }
 610
 611 static int
 612 nfp_flower_populate_merge_match(struct nfp_fl_payload *flow,
 613                                 struct nfp_flower_merge_check *merge,
 614                                 bool extra_fields)
 615 {
 616         struct nfp_flower_meta_tci *meta_tci;
 617         u8 *mask = flow->mask_data;
 618         u8 key_layer, match_size;
 619
 620         memset(merge, 0, sizeof(struct nfp_flower_merge_check));
 621
 622         meta_tci = (struct nfp_flower_meta_tci *)mask;
 623         key_layer = meta_tci->nfp_flow_key_layer;
 624
 625         if (key_layer & ~NFP_FLOWER_MERGE_FIELDS && !extra_fields)
 626                 return -EOPNOTSUPP;
 627
 628         merge->tci = meta_tci->tci;
 629         mask += sizeof(struct nfp_flower_meta_tci);
 630
 631         if (key_layer & NFP_FLOWER_LAYER_EXT_META)
 632                 mask += sizeof(struct nfp_flower_ext_meta);
 633
 634         mask += sizeof(struct nfp_flower_in_port);
 635
 636         if (key_layer & NFP_FLOWER_LAYER_MAC) {
 637                 match_size = sizeof(struct nfp_flower_mac_mpls);
 638                 memcpy(&merge->l2, mask, match_size);
 639                 mask += match_size;
 640         }
 641
 642         if (key_layer & NFP_FLOWER_LAYER_TP) {
 643                 match_size = sizeof(struct nfp_flower_tp_ports);
 644                 memcpy(&merge->l4, mask, match_size);
 645                 mask += match_size;
 646         }
 647
 648         if (key_layer & NFP_FLOWER_LAYER_IPV4) {
 649                 match_size = sizeof(struct nfp_flower_ipv4);
 650                 memcpy(&merge->ipv4, mask, match_size);
 651         }
 652
 653         if (key_layer & NFP_FLOWER_LAYER_IPV6) {
 654                 match_size = sizeof(struct nfp_flower_ipv6);
 655                 memcpy(&merge->ipv6, mask, match_size);
 656         }
 657
 658         return 0;
 659 }
 660
 661 static int
 662 nfp_flower_can_merge(struct nfp_fl_payload *sub_flow1,
 663                      struct nfp_fl_payload *sub_flow2)
 664 {
 665         /* Two flows can be merged if sub_flow2 only matches on bits that are
 666          * either matched by sub_flow1 or set by a sub_flow1 action. This
 667          * ensures that every packet that hits sub_flow1 and recirculates is
 668          * guaranteed to hit sub_flow2.
 669          */
 670         struct nfp_flower_merge_check sub_flow1_merge, sub_flow2_merge;
 671         int err, act_out = 0;
 672         u8 last_act_id = 0;
 673
 674         err = nfp_flower_populate_merge_match(sub_flow1, &sub_flow1_merge,
 675                                               true);
 676         if (err)
 677                 return err;
 678
 679         err = nfp_flower_populate_merge_match(sub_flow2, &sub_flow2_merge,
 680                                               false);
 681         if (err)
 682                 return err;
 683
 684         err = nfp_flower_update_merge_with_actions(sub_flow1, &sub_flow1_merge,
 685                                                    &last_act_id, &act_out);
 686         if (err)
 687                 return err;
 688
 689         /* Must only be 1 output action and it must be the last in sequence. */
 690         if (act_out != 1 || last_act_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 691                 return -EOPNOTSUPP;
 692
 693         /* Reject merge if sub_flow2 matches on something that is not matched
 694          * on or set in an action by sub_flow1.
 695          */
 696         err = bitmap_andnot(sub_flow2_merge.vals, sub_flow2_merge.vals,
 697                             sub_flow1_merge.vals,
 698                             sizeof(struct nfp_flower_merge_check) * 8);
 699         if (err)
 700                 return -EINVAL;
 701
 702         return 0;
 703 }
 704
 705 static unsigned int
 706 nfp_flower_copy_pre_actions(char *act_dst, char *act_src, int len,
 707                             bool *tunnel_act)
 708 {
 709         unsigned int act_off = 0, act_len;
 710         struct nfp_fl_act_head *a;
 711         u8 act_id = 0;
 712
 713         while (act_off < len) {
 714                 a = (struct nfp_fl_act_head *)&act_src[act_off];
 715                 act_len = a->len_lw << NFP_FL_LW_SIZ;
 716                 act_id = a->jump_id;
 717
 718                 switch (act_id) {
 719                 case NFP_FL_ACTION_OPCODE_PRE_TUNNEL:
 720                         if (tunnel_act)
 721                                 *tunnel_act = true;
 722                         /* fall through */
 723                 case NFP_FL_ACTION_OPCODE_PRE_LAG:
 724                         memcpy(act_dst + act_off, act_src + act_off, act_len);
 725                         break;
 726                 default:
 727                         return act_off;
 728                 }
 729
 730                 act_off += act_len;
 731         }
 732
 733         return act_off;
 734 }
 735
 736 static int
 737 nfp_fl_verify_post_tun_acts(char *acts, int len, struct nfp_fl_push_vlan **vlan)
 738 {
 739         struct nfp_fl_act_head *a;
 740         unsigned int act_off = 0;
 741
 742         while (act_off < len) {
 743                 a = (struct nfp_fl_act_head *)&acts[act_off];
 744
 745                 if (a->jump_id == NFP_FL_ACTION_OPCODE_PUSH_VLAN && !act_off)
 746                         *vlan = (struct nfp_fl_push_vlan *)a;
 747                 else if (a->jump_id != NFP_FL_ACTION_OPCODE_OUTPUT)
 748                         return -EOPNOTSUPP;
 749
 750                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 751         }
 752
 753         /* Ensure any VLAN push also has an egress action. */
 754         if (*vlan && act_off <= sizeof(struct nfp_fl_push_vlan))
 755                 return -EOPNOTSUPP;
 756
 757         return 0;
 758 }
 759
 760 static int
 761 nfp_fl_push_vlan_after_tun(char *acts, int len, struct nfp_fl_push_vlan *vlan)
 762 {
 763         struct nfp_fl_set_ipv4_tun *tun;
 764         struct nfp_fl_act_head *a;
 765         unsigned int act_off = 0;
 766
 767         while (act_off < len) {
 768                 a = (struct nfp_fl_act_head *)&acts[act_off];
 769
 770                 if (a->jump_id == NFP_FL_ACTION_OPCODE_SET_IPV4_TUNNEL) {
 771                         tun = (struct nfp_fl_set_ipv4_tun *)a;
 772                         tun->outer_vlan_tpid = vlan->vlan_tpid;
 773                         tun->outer_vlan_tci = vlan->vlan_tci;
 774
 775                         return 0;
 776                 }
 777
 778                 act_off += a->len_lw << NFP_FL_LW_SIZ;
 779         }
 780
 781         /* Return error if no tunnel action is found. */
 782         return -EOPNOTSUPP;
 783 }
 784
 785 static int
 786 nfp_flower_merge_action(struct nfp_fl_payload *sub_flow1,
 787                         struct nfp_fl_payload *sub_flow2,
 788                         struct nfp_fl_payload *merge_flow)
 789 {
 790         unsigned int sub1_act_len, sub2_act_len, pre_off1, pre_off2;
 791         struct nfp_fl_push_vlan *post_tun_push_vlan = NULL;
 792         bool tunnel_act = false;
 793         char *merge_act;
 794         int err;
 795
 796         /* The last action of sub_flow1 must be output - do not merge this. */
 797         sub1_act_len = sub_flow1->meta.act_len - sizeof(struct nfp_fl_output);
 798         sub2_act_len = sub_flow2->meta.act_len;
 799
 800         if (!sub2_act_len)
 801                 return -EINVAL;
 802
 803         if (sub1_act_len + sub2_act_len > NFP_FL_MAX_A_SIZ)
 804                 return -EINVAL;
 805
 806         /* A shortcut can only be applied if there is a single action. */
 807         if (sub1_act_len)
 808                 merge_flow->meta.shortcut = cpu_to_be32(NFP_FL_SC_ACT_NULL);
 809         else
 810                 merge_flow->meta.shortcut = sub_flow2->meta.shortcut;
 811
 812         merge_flow->meta.act_len = sub1_act_len + sub2_act_len;
 813         merge_act = merge_flow->action_data;
 814
 815         /* Copy any pre-actions to the start of merge flow action list. */
 816         pre_off1 = nfp_flower_copy_pre_actions(merge_act,
 817                                                sub_flow1->action_data,
 818                                                sub1_act_len, &tunnel_act);
 819         merge_act += pre_off1;
 820         sub1_act_len -= pre_off1;
 821         pre_off2 = nfp_flower_copy_pre_actions(merge_act,
 822                                                sub_flow2->action_data,
 823                                                sub2_act_len, NULL);
 824         merge_act += pre_off2;
 825         sub2_act_len -= pre_off2;
 826
 827         /* FW does a tunnel push when egressing, therefore, if sub_flow 1 pushes
 828          * a tunnel, there are restrictions on what sub_flow 2 actions lead to a
 829          * valid merge.
 830          */
 831         if (tunnel_act) {
 832                 char *post_tun_acts = &sub_flow2->action_data[pre_off2];
 833
 834                 err = nfp_fl_verify_post_tun_acts(post_tun_acts, sub2_act_len,
 835                                                   &post_tun_push_vlan);
 836                 if (err)
 837                         return err;
 838
 839                 if (post_tun_push_vlan) {
 840                         pre_off2 += sizeof(*post_tun_push_vlan);
 841                         sub2_act_len -= sizeof(*post_tun_push_vlan);
 842                 }
 843         }
 844
 845         /* Copy remaining actions from sub_flows 1 and 2. */
 846         memcpy(merge_act, sub_flow1->action_data + pre_off1, sub1_act_len);
 847
 848         if (post_tun_push_vlan) {
 849                 /* Update tunnel action in merge to include VLAN push. */
 850                 err = nfp_fl_push_vlan_after_tun(merge_act, sub1_act_len,
 851                                                  post_tun_push_vlan);
 852                 if (err)
 853                         return err;
 854
 855                 merge_flow->meta.act_len -= sizeof(*post_tun_push_vlan);
 856         }
 857
 858         merge_act += sub1_act_len;
 859         memcpy(merge_act, sub_flow2->action_data + pre_off2, sub2_act_len);
 860
 861         return 0;
 862 }
 863
 864 /* Flow link code should only be accessed under RTNL. */
 865 static void nfp_flower_unlink_flow(struct nfp_fl_payload_link *link)
 866 {
 867         list_del(&link->merge_flow.list);
 868         list_del(&link->sub_flow.list);
 869         kfree(link);
 870 }
 871
 872 static void nfp_flower_unlink_flows(struct nfp_fl_payload *merge_flow,
 873                                     struct nfp_fl_payload *sub_flow)
 874 {
 875         struct nfp_fl_payload_link *link;
 876
 877         list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list)
 878                 if (link->sub_flow.flow == sub_flow) {
 879                         nfp_flower_unlink_flow(link);
 880                         return;
 881                 }
 882 }
 883
 884 static int nfp_flower_link_flows(struct nfp_fl_payload *merge_flow,
 885                                  struct nfp_fl_payload *sub_flow)
 886 {
 887         struct nfp_fl_payload_link *link;
 888
 889         link = kmalloc(sizeof(*link), GFP_KERNEL);
 890         if (!link)
 891                 return -ENOMEM;
 892
 893         link->merge_flow.flow = merge_flow;
 894         list_add_tail(&link->merge_flow.list, &merge_flow->linked_flows);
 895         link->sub_flow.flow = sub_flow;
 896         list_add_tail(&link->sub_flow.list, &sub_flow->linked_flows);
 897
 898         return 0;
 899 }
 900
 901 /**
 902  * nfp_flower_merge_offloaded_flows() - Merge 2 existing flows to single flow.
 903  * @app:        Pointer to the APP handle
 904  * @sub_flow1:  Initial flow matched to produce merge hint
 905  * @sub_flow2:  Post recirculation flow matched in merge hint
 906  *
 907  * Combines 2 flows (if valid) to a single flow, removing the initial from hw
 908  * and offloading the new, merged flow.
 909  *
 910  * Return: negative value on error, 0 in success.
 911  */
 912 int nfp_flower_merge_offloaded_flows(struct nfp_app *app,
 913                                      struct nfp_fl_payload *sub_flow1,
 914                                      struct nfp_fl_payload *sub_flow2)
 915 {
 916         struct flow_cls_offload merge_tc_off;
 917         struct nfp_flower_priv *priv = app->priv;
 918         struct netlink_ext_ack *extack = NULL;
 919         struct nfp_fl_payload *merge_flow;
 920         struct nfp_fl_key_ls merge_key_ls;
 921         int err;
 922
 923         ASSERT_RTNL();
 924
 925         extack = merge_tc_off.common.extack;
 926         if (sub_flow1 == sub_flow2 ||
 927             nfp_flower_is_merge_flow(sub_flow1) ||
 928             nfp_flower_is_merge_flow(sub_flow2))
 929                 return -EINVAL;
 930
 931         err = nfp_flower_can_merge(sub_flow1, sub_flow2);
 932         if (err)
 933                 return err;
 934
 935         merge_key_ls.key_size = sub_flow1->meta.key_len;
 936
 937         merge_flow = nfp_flower_allocate_new(&merge_key_ls);
 938         if (!merge_flow)
 939                 return -ENOMEM;
 940
 941         merge_flow->tc_flower_cookie = (unsigned long)merge_flow;
 942         merge_flow->ingress_dev = sub_flow1->ingress_dev;
 943
 944         memcpy(merge_flow->unmasked_data, sub_flow1->unmasked_data,
 945                sub_flow1->meta.key_len);
 946         memcpy(merge_flow->mask_data, sub_flow1->mask_data,
 947                sub_flow1->meta.mask_len);
 948
 949         err = nfp_flower_merge_action(sub_flow1, sub_flow2, merge_flow);
 950         if (err)
 951                 goto err_destroy_merge_flow;
 952
 953         err = nfp_flower_link_flows(merge_flow, sub_flow1);
 954         if (err)
 955                 goto err_destroy_merge_flow;
 956
 957         err = nfp_flower_link_flows(merge_flow, sub_flow2);
 958         if (err)
 959                 goto err_unlink_sub_flow1;
 960
 961         merge_tc_off.cookie = merge_flow->tc_flower_cookie;
 962         err = nfp_compile_flow_metadata(app, &merge_tc_off, merge_flow,
 963                                         merge_flow->ingress_dev, extack);
 964         if (err)
 965                 goto err_unlink_sub_flow2;
 966
 967         err = rhashtable_insert_fast(&priv->flow_table, &merge_flow->fl_node,
 968                                      nfp_flower_table_params);
 969         if (err)
 970                 goto err_release_metadata;
 971
 972         err = nfp_flower_xmit_flow(app, merge_flow,
 973                                    NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
 974         if (err)
 975                 goto err_remove_rhash;
 976
 977         merge_flow->in_hw = true;
 978         sub_flow1->in_hw = false;
 979
 980         return 0;
 981
 982 err_remove_rhash:
 983         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 984                                             &merge_flow->fl_node,
 985                                             nfp_flower_table_params));
 986 err_release_metadata:
 987         nfp_modify_flow_metadata(app, merge_flow);
 988 err_unlink_sub_flow2:
 989         nfp_flower_unlink_flows(merge_flow, sub_flow2);
 990 err_unlink_sub_flow1:
 991         nfp_flower_unlink_flows(merge_flow, sub_flow1);
 992 err_destroy_merge_flow:
 993         kfree(merge_flow->action_data);
 994         kfree(merge_flow->mask_data);
 995         kfree(merge_flow->unmasked_data);
 996         kfree(merge_flow);
 997         return err;
 998 }
 999
1000 /**
1001  * nfp_flower_validate_pre_tun_rule()
1002  * @app:        Pointer to the APP handle
1003  * @flow:       Pointer to NFP flow representation of rule
1004  * @extack:     Netlink extended ACK report
1005  *
1006  * Verifies the flow as a pre-tunnel rule.
1007  *
1008  * Return: negative value on error, 0 if verified.
1009  */
1010 static int
1011 nfp_flower_validate_pre_tun_rule(struct nfp_app *app,
1012                                  struct nfp_fl_payload *flow,
1013                                  struct netlink_ext_ack *extack)
1014 {
1015         return -EOPNOTSUPP;
1016 }
1017
1018 /**
1019  * nfp_flower_add_offload() - Adds a new flow to hardware.
1020  * @app:        Pointer to the APP handle
1021  * @netdev:     netdev structure.
1022  * @flow:       TC flower classifier offload structure.
1023  *
1024  * Adds a new flow to the repeated hash structure and action payload.
1025  *
1026  * Return: negative value on error, 0 if configured successfully.
1027  */
1028 static int
1029 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
1030                        struct flow_cls_offload *flow)
1031 {
1032         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
1033         struct nfp_flower_priv *priv = app->priv;
1034         struct netlink_ext_ack *extack = NULL;
1035         struct nfp_fl_payload *flow_pay;
1036         struct nfp_fl_key_ls *key_layer;
1037         struct nfp_port *port = NULL;
1038         int err;
1039
1040         extack = flow->common.extack;
1041         if (nfp_netdev_is_nfp_repr(netdev))
1042                 port = nfp_port_from_netdev(netdev);
1043
1044         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
1045         if (!key_layer)
1046                 return -ENOMEM;
1047
1048         err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
1049                                               &tun_type, extack);
1050         if (err)
1051                 goto err_free_key_ls;
1052
1053         flow_pay = nfp_flower_allocate_new(key_layer);
1054         if (!flow_pay) {
1055                 err = -ENOMEM;
1056                 goto err_free_key_ls;
1057         }
1058
1059         err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
1060                                             flow_pay, tun_type, extack);
1061         if (err)
1062                 goto err_destroy_flow;
1063
1064         err = nfp_flower_compile_action(app, flow, netdev, flow_pay, extack);
1065         if (err)
1066                 goto err_destroy_flow;
1067
1068         if (flow_pay->pre_tun_rule.dev) {
1069                 err = nfp_flower_validate_pre_tun_rule(app, flow_pay, extack);
1070                 if (err)
1071                         goto err_destroy_flow;
1072         }
1073
1074         err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev, extack);
1075         if (err)
1076                 goto err_destroy_flow;
1077
1078         flow_pay->tc_flower_cookie = flow->cookie;
1079         err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
1080                                      nfp_flower_table_params);
1081         if (err) {
1082                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot insert flow into tables for offloads");
1083                 goto err_release_metadata;
1084         }
1085
1086         err = nfp_flower_xmit_flow(app, flow_pay,
1087                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
1088         if (err)
1089                 goto err_remove_rhash;
1090
1091         if (port)
1092                 port->tc_offload_cnt++;
1093
1094         flow_pay->in_hw = true;
1095
1096         /* Deallocate flow payload when flower rule has been destroyed. */
1097         kfree(key_layer);
1098
1099         return 0;
1100
1101 err_remove_rhash:
1102         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1103                                             &flow_pay->fl_node,
1104                                             nfp_flower_table_params));
1105 err_release_metadata:
1106         nfp_modify_flow_metadata(app, flow_pay);
1107 err_destroy_flow:
1108         kfree(flow_pay->action_data);
1109         kfree(flow_pay->mask_data);
1110         kfree(flow_pay->unmasked_data);
1111         kfree(flow_pay);
1112 err_free_key_ls:
1113         kfree(key_layer);
1114         return err;
1115 }
1116
1117 static void
1118 nfp_flower_remove_merge_flow(struct nfp_app *app,
1119                              struct nfp_fl_payload *del_sub_flow,
1120                              struct nfp_fl_payload *merge_flow)
1121 {
1122         struct nfp_flower_priv *priv = app->priv;
1123         struct nfp_fl_payload_link *link, *temp;
1124         struct nfp_fl_payload *origin;
1125         bool mod = false;
1126         int err;
1127
1128         link = list_first_entry(&merge_flow->linked_flows,
1129                                 struct nfp_fl_payload_link, merge_flow.list);
1130         origin = link->sub_flow.flow;
1131
1132         /* Re-add rule the merge had overwritten if it has not been deleted. */
1133         if (origin != del_sub_flow)
1134                 mod = true;
1135
1136         err = nfp_modify_flow_metadata(app, merge_flow);
1137         if (err) {
1138                 nfp_flower_cmsg_warn(app, "Metadata fail for merge flow delete.\n");
1139                 goto err_free_links;
1140         }
1141
1142         if (!mod) {
1143                 err = nfp_flower_xmit_flow(app, merge_flow,
1144                                            NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1145                 if (err) {
1146                         nfp_flower_cmsg_warn(app, "Failed to delete merged flow.\n");
1147                         goto err_free_links;
1148                 }
1149         } else {
1150                 __nfp_modify_flow_metadata(priv, origin);
1151                 err = nfp_flower_xmit_flow(app, origin,
1152                                            NFP_FLOWER_CMSG_TYPE_FLOW_MOD);
1153                 if (err)
1154                         nfp_flower_cmsg_warn(app, "Failed to revert merge flow.\n");
1155                 origin->in_hw = true;
1156         }
1157
1158 err_free_links:
1159         /* Clean any links connected with the merged flow. */
1160         list_for_each_entry_safe(link, temp, &merge_flow->linked_flows,
1161                                  merge_flow.list)
1162                 nfp_flower_unlink_flow(link);
1163
1164         kfree(merge_flow->action_data);
1165         kfree(merge_flow->mask_data);
1166         kfree(merge_flow->unmasked_data);
1167         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1168                                             &merge_flow->fl_node,
1169                                             nfp_flower_table_params));
1170         kfree_rcu(merge_flow, rcu);
1171 }
1172
1173 static void
1174 nfp_flower_del_linked_merge_flows(struct nfp_app *app,
1175                                   struct nfp_fl_payload *sub_flow)
1176 {
1177         struct nfp_fl_payload_link *link, *temp;
1178
1179         /* Remove any merge flow formed from the deleted sub_flow. */
1180         list_for_each_entry_safe(link, temp, &sub_flow->linked_flows,
1181                                  sub_flow.list)
1182                 nfp_flower_remove_merge_flow(app, sub_flow,
1183                                              link->merge_flow.flow);
1184 }
1185
1186 /**
1187  * nfp_flower_del_offload() - Removes a flow from hardware.
1188  * @app:        Pointer to the APP handle
1189  * @netdev:     netdev structure.
1190  * @flow:       TC flower classifier offload structure
1191  *
1192  * Removes a flow from the repeated hash structure and clears the
1193  * action payload. Any flows merged from this are also deleted.
1194  *
1195  * Return: negative value on error, 0 if removed successfully.
1196  */
1197 static int
1198 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
1199                        struct flow_cls_offload *flow)
1200 {
1201         struct nfp_flower_priv *priv = app->priv;
1202         struct netlink_ext_ack *extack = NULL;
1203         struct nfp_fl_payload *nfp_flow;
1204         struct nfp_port *port = NULL;
1205         int err;
1206
1207         extack = flow->common.extack;
1208         if (nfp_netdev_is_nfp_repr(netdev))
1209                 port = nfp_port_from_netdev(netdev);
1210
1211         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1212         if (!nfp_flow) {
1213                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot remove flow that does not exist");
1214                 return -ENOENT;
1215         }
1216
1217         err = nfp_modify_flow_metadata(app, nfp_flow);
1218         if (err)
1219                 goto err_free_merge_flow;
1220
1221         if (nfp_flow->nfp_tun_ipv4_addr)
1222                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
1223
1224         if (!nfp_flow->in_hw) {
1225                 err = 0;
1226                 goto err_free_merge_flow;
1227         }
1228
1229         err = nfp_flower_xmit_flow(app, nfp_flow,
1230                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
1231         /* Fall through on error. */
1232
1233 err_free_merge_flow:
1234         nfp_flower_del_linked_merge_flows(app, nfp_flow);
1235         if (port)
1236                 port->tc_offload_cnt--;
1237         kfree(nfp_flow->action_data);
1238         kfree(nfp_flow->mask_data);
1239         kfree(nfp_flow->unmasked_data);
1240         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
1241                                             &nfp_flow->fl_node,
1242                                             nfp_flower_table_params));
1243         kfree_rcu(nfp_flow, rcu);
1244         return err;
1245 }
1246
1247 static void
1248 __nfp_flower_update_merge_stats(struct nfp_app *app,
1249                                 struct nfp_fl_payload *merge_flow)
1250 {
1251         struct nfp_flower_priv *priv = app->priv;
1252         struct nfp_fl_payload_link *link;
1253         struct nfp_fl_payload *sub_flow;
1254         u64 pkts, bytes, used;
1255         u32 ctx_id;
1256
1257         ctx_id = be32_to_cpu(merge_flow->meta.host_ctx_id);
1258         pkts = priv->stats[ctx_id].pkts;
1259         /* Do not cycle subflows if no stats to distribute. */
1260         if (!pkts)
1261                 return;
1262         bytes = priv->stats[ctx_id].bytes;
1263         used = priv->stats[ctx_id].used;
1264
1265         /* Reset stats for the merge flow. */
1266         priv->stats[ctx_id].pkts = 0;
1267         priv->stats[ctx_id].bytes = 0;
1268
1269         /* The merge flow has received stats updates from firmware.
1270          * Distribute these stats to all subflows that form the merge.
1271          * The stats will collected from TC via the subflows.
1272          */
1273         list_for_each_entry(link, &merge_flow->linked_flows, merge_flow.list) {
1274                 sub_flow = link->sub_flow.flow;
1275                 ctx_id = be32_to_cpu(sub_flow->meta.host_ctx_id);
1276                 priv->stats[ctx_id].pkts += pkts;
1277                 priv->stats[ctx_id].bytes += bytes;
1278                 max_t(u64, priv->stats[ctx_id].used, used);
1279         }
1280 }
1281
1282 static void
1283 nfp_flower_update_merge_stats(struct nfp_app *app,
1284                               struct nfp_fl_payload *sub_flow)
1285 {
1286         struct nfp_fl_payload_link *link;
1287
1288         /* Get merge flows that the subflow forms to distribute their stats. */
1289         list_for_each_entry(link, &sub_flow->linked_flows, sub_flow.list)
1290                 __nfp_flower_update_merge_stats(app, link->merge_flow.flow);
1291 }
1292
1293 /**
1294  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
1295  * @app:        Pointer to the APP handle
1296  * @netdev:     Netdev structure.
1297  * @flow:       TC flower classifier offload structure
1298  *
1299  * Populates a flow statistics structure which which corresponds to a
1300  * specific flow.
1301  *
1302  * Return: negative value on error, 0 if stats populated successfully.
1303  */
1304 static int
1305 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
1306                      struct flow_cls_offload *flow)
1307 {
1308         struct nfp_flower_priv *priv = app->priv;
1309         struct netlink_ext_ack *extack = NULL;
1310         struct nfp_fl_payload *nfp_flow;
1311         u32 ctx_id;
1312
1313         extack = flow->common.extack;
1314         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
1315         if (!nfp_flow) {
1316                 NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot dump stats for flow that does not exist");
1317                 return -EINVAL;
1318         }
1319
1320         ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
1321
1322         spin_lock_bh(&priv->stats_lock);
1323         /* If request is for a sub_flow, update stats from merged flows. */
1324         if (!list_empty(&nfp_flow->linked_flows))
1325                 nfp_flower_update_merge_stats(app, nfp_flow);
1326
1327         flow_stats_update(&flow->stats, priv->stats[ctx_id].bytes,
1328                           priv->stats[ctx_id].pkts, priv->stats[ctx_id].used);
1329
1330         priv->stats[ctx_id].pkts = 0;
1331         priv->stats[ctx_id].bytes = 0;
1332         spin_unlock_bh(&priv->stats_lock);
1333
1334         return 0;
1335 }
1336
1337 static int
1338 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
1339                         struct flow_cls_offload *flower)
1340 {
1341         if (!eth_proto_is_802_3(flower->common.protocol))
1342                 return -EOPNOTSUPP;
1343
1344         switch (flower->command) {
1345         case FLOW_CLS_REPLACE:
1346                 return nfp_flower_add_offload(app, netdev, flower);
1347         case FLOW_CLS_DESTROY:
1348                 return nfp_flower_del_offload(app, netdev, flower);
1349         case FLOW_CLS_STATS:
1350                 return nfp_flower_get_stats(app, netdev, flower);
1351         default:
1352                 return -EOPNOTSUPP;
1353         }
1354 }
1355
1356 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
1357                                         void *type_data, void *cb_priv)
1358 {
1359         struct nfp_repr *repr = cb_priv;
1360
1361         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
1362                 return -EOPNOTSUPP;
1363
1364         switch (type) {
1365         case TC_SETUP_CLSFLOWER:
1366                 return nfp_flower_repr_offload(repr->app, repr->netdev,
1367                                                type_data);
1368         case TC_SETUP_CLSMATCHALL:
1369                 return nfp_flower_setup_qos_offload(repr->app, repr->netdev,
1370                                                     type_data);
1371         default:
1372                 return -EOPNOTSUPP;
1373         }
1374 }
1375
1376 static LIST_HEAD(nfp_block_cb_list);
1377
1378 static int nfp_flower_setup_tc_block(struct net_device *netdev,
1379                                      struct flow_block_offload *f)
1380 {
1381         struct nfp_repr *repr = netdev_priv(netdev);
1382         struct nfp_flower_repr_priv *repr_priv;
1383         struct flow_block_cb *block_cb;
1384
1385         if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1386                 return -EOPNOTSUPP;
1387
1388         repr_priv = repr->app_priv;
1389         repr_priv->block_shared = f->block_shared;
1390         f->driver_block_list = &nfp_block_cb_list;
1391
1392         switch (f->command) {
1393         case FLOW_BLOCK_BIND:
1394                 if (flow_block_cb_is_busy(nfp_flower_setup_tc_block_cb, repr,
1395                                           &nfp_block_cb_list))
1396                         return -EBUSY;
1397
1398                 block_cb = flow_block_cb_alloc(nfp_flower_setup_tc_block_cb,
1399                                                repr, repr, NULL);
1400                 if (IS_ERR(block_cb))
1401                         return PTR_ERR(block_cb);
1402
1403                 flow_block_cb_add(block_cb, f);
1404                 list_add_tail(&block_cb->driver_list, &nfp_block_cb_list);
1405                 return 0;
1406         case FLOW_BLOCK_UNBIND:
1407                 block_cb = flow_block_cb_lookup(f->block,
1408                                                 nfp_flower_setup_tc_block_cb,
1409                                                 repr);
1410                 if (!block_cb)
1411                         return -ENOENT;
1412
1413                 flow_block_cb_remove(block_cb, f);
1414                 list_del(&block_cb->driver_list);
1415                 return 0;
1416         default:
1417                 return -EOPNOTSUPP;
1418         }
1419 }
1420
1421 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
1422                         enum tc_setup_type type, void *type_data)
1423 {
1424         switch (type) {
1425         case TC_SETUP_BLOCK:
1426                 return nfp_flower_setup_tc_block(netdev, type_data);
1427         default:
1428                 return -EOPNOTSUPP;
1429         }
1430 }
1431
1432 struct nfp_flower_indr_block_cb_priv {
1433         struct net_device *netdev;
1434         struct nfp_app *app;
1435         struct list_head list;
1436 };
1437
1438 static struct nfp_flower_indr_block_cb_priv *
1439 nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
1440                                      struct net_device *netdev)
1441 {
1442         struct nfp_flower_indr_block_cb_priv *cb_priv;
1443         struct nfp_flower_priv *priv = app->priv;
1444
1445         /* All callback list access should be protected by RTNL. */
1446         ASSERT_RTNL();
1447
1448         list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
1449                 if (cb_priv->netdev == netdev)
1450                         return cb_priv;
1451
1452         return NULL;
1453 }
1454
1455 static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
1456                                           void *type_data, void *cb_priv)
1457 {
1458         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
1459         struct flow_cls_offload *flower = type_data;
1460
1461         if (flower->common.chain_index)
1462                 return -EOPNOTSUPP;
1463
1464         switch (type) {
1465         case TC_SETUP_CLSFLOWER:
1466                 return nfp_flower_repr_offload(priv->app, priv->netdev,
1467                                                type_data);
1468         default:
1469                 return -EOPNOTSUPP;
1470         }
1471 }
1472
1473 static void nfp_flower_setup_indr_tc_release(void *cb_priv)
1474 {
1475         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
1476
1477         list_del(&priv->list);
1478         kfree(priv);
1479 }
1480
1481 static int
1482 nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
1483                                struct flow_block_offload *f)
1484 {
1485         struct nfp_flower_indr_block_cb_priv *cb_priv;
1486         struct nfp_flower_priv *priv = app->priv;
1487         struct flow_block_cb *block_cb;
1488
1489         if (f->binder_type != FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS &&
1490             !(f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS &&
1491               nfp_flower_internal_port_can_offload(app, netdev)))
1492                 return -EOPNOTSUPP;
1493
1494         switch (f->command) {
1495         case FLOW_BLOCK_BIND:
1496                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
1497                 if (!cb_priv)
1498                         return -ENOMEM;
1499
1500                 cb_priv->netdev = netdev;
1501                 cb_priv->app = app;
1502                 list_add(&cb_priv->list, &priv->indr_block_cb_priv);
1503
1504                 block_cb = flow_block_cb_alloc(nfp_flower_setup_indr_block_cb,
1505                                                cb_priv, cb_priv,
1506                                                nfp_flower_setup_indr_tc_release);
1507                 if (IS_ERR(block_cb)) {
1508                         list_del(&cb_priv->list);
1509                         kfree(cb_priv);
1510                         return PTR_ERR(block_cb);
1511                 }
1512
1513                 flow_block_cb_add(block_cb, f);
1514                 list_add_tail(&block_cb->driver_list, &nfp_block_cb_list);
1515                 return 0;
1516         case FLOW_BLOCK_UNBIND:
1517                 cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
1518                 if (!cb_priv)
1519                         return -ENOENT;
1520
1521                 block_cb = flow_block_cb_lookup(f->block,
1522                                                 nfp_flower_setup_indr_block_cb,
1523                                                 cb_priv);
1524                 if (!block_cb)
1525                         return -ENOENT;
1526
1527                 flow_block_cb_remove(block_cb, f);
1528                 list_del(&block_cb->driver_list);
1529                 return 0;
1530         default:
1531                 return -EOPNOTSUPP;
1532         }
1533         return 0;
1534 }
1535
1536 static int
1537 nfp_flower_indr_setup_tc_cb(struct net_device *netdev, void *cb_priv,
1538                             enum tc_setup_type type, void *type_data)
1539 {
1540         switch (type) {
1541         case TC_SETUP_BLOCK:
1542                 return nfp_flower_setup_indr_tc_block(netdev, cb_priv,
1543                                                       type_data);
1544         default:
1545                 return -EOPNOTSUPP;
1546         }
1547 }
1548
1549 int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
1550                                        struct net_device *netdev,
1551                                        unsigned long event)
1552 {
1553         int err;
1554
1555         if (!nfp_fl_is_netdev_to_offload(netdev))
1556                 return NOTIFY_OK;
1557
1558         if (event == NETDEV_REGISTER) {
1559                 err = __tc_indr_block_cb_register(netdev, app,
1560                                                   nfp_flower_indr_setup_tc_cb,
1561                                                   app);
1562                 if (err)
1563                         nfp_flower_cmsg_warn(app,
1564                                              "Indirect block reg failed - %s\n",
1565                                              netdev->name);
1566         } else if (event == NETDEV_UNREGISTER) {
1567                 __tc_indr_block_cb_unregister(netdev,
1568                                               nfp_flower_indr_setup_tc_cb, app);
1569         }
1570
1571         return NOTIFY_OK;
1572 }