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 static int
  59 nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
  60                      u8 mtype)
  61 {
  62         u32 meta_len, key_len, mask_len, act_len, tot_len;
  63         struct sk_buff *skb;
  64         unsigned char *msg;
  65
  66         meta_len =  sizeof(struct nfp_fl_rule_metadata);
  67         key_len = nfp_flow->meta.key_len;
  68         mask_len = nfp_flow->meta.mask_len;
  69         act_len = nfp_flow->meta.act_len;
  70
  71         tot_len = meta_len + key_len + mask_len + act_len;
  72
  73         /* Convert to long words as firmware expects
  74          * lengths in units of NFP_FL_LW_SIZ.
  75          */
  76         nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
  77         nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
  78         nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;
  79
  80         skb = nfp_flower_cmsg_alloc(app, tot_len, mtype, GFP_KERNEL);
  81         if (!skb)
  82                 return -ENOMEM;
  83
  84         msg = nfp_flower_cmsg_get_data(skb);
  85         memcpy(msg, &nfp_flow->meta, meta_len);
  86         memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
  87         memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
  88         memcpy(&msg[meta_len + key_len + mask_len],
  89                nfp_flow->action_data, act_len);
  90
  91         /* Convert back to bytes as software expects
  92          * lengths in units of bytes.
  93          */
  94         nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
  95         nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
  96         nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
  97
  98         nfp_ctrl_tx(app->ctrl, skb);
  99
 100         return 0;
 101 }
 102
 103 static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
 104 {
 105         return dissector_uses_key(f->dissector,
 106                                   FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 107                 dissector_uses_key(f->dissector,
 108                                    FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 109                 dissector_uses_key(f->dissector,
 110                                    FLOW_DISSECTOR_KEY_PORTS) ||
 111                 dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP);
 112 }
 113
 114 static int
 115 nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
 116                           u32 *key_layer_two, int *key_size)
 117 {
 118         if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY)
 119                 return -EOPNOTSUPP;
 120
 121         if (enc_opts->len > 0) {
 122                 *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 123                 *key_size += sizeof(struct nfp_flower_geneve_options);
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int
 130 nfp_flower_calculate_key_layers(struct nfp_app *app,
 131                                 struct net_device *netdev,
 132                                 struct nfp_fl_key_ls *ret_key_ls,
 133                                 struct tc_cls_flower_offload *flow,
 134                                 enum nfp_flower_tun_type *tun_type)
 135 {
 136         struct flow_dissector_key_basic *mask_basic = NULL;
 137         struct flow_dissector_key_basic *key_basic = NULL;
 138         struct nfp_flower_priv *priv = app->priv;
 139         u32 key_layer_two;
 140         u8 key_layer;
 141         int key_size;
 142         int err;
 143
 144         if (flow->dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR)
 145                 return -EOPNOTSUPP;
 146
 147         /* If any tun dissector is used then the required set must be used. */
 148         if (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 149             (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 150             != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 151                 return -EOPNOTSUPP;
 152
 153         key_layer_two = 0;
 154         key_layer = NFP_FLOWER_LAYER_PORT;
 155         key_size = sizeof(struct nfp_flower_meta_tci) +
 156                    sizeof(struct nfp_flower_in_port);
 157
 158         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 159             dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 160                 key_layer |= NFP_FLOWER_LAYER_MAC;
 161                 key_size += sizeof(struct nfp_flower_mac_mpls);
 162         }
 163
 164         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_VLAN)) {
 165                 struct flow_dissector_key_vlan *flow_vlan;
 166
 167                 flow_vlan = skb_flow_dissector_target(flow->dissector,
 168                                                       FLOW_DISSECTOR_KEY_VLAN,
 169                                                       flow->mask);
 170                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 171                     flow_vlan->vlan_priority)
 172                         return -EOPNOTSUPP;
 173         }
 174
 175         if (dissector_uses_key(flow->dissector,
 176                                FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 177                 struct flow_dissector_key_ipv4_addrs *mask_ipv4 = NULL;
 178                 struct flow_dissector_key_ports *mask_enc_ports = NULL;
 179                 struct flow_dissector_key_enc_opts *enc_op = NULL;
 180                 struct flow_dissector_key_ports *enc_ports = NULL;
 181                 struct flow_dissector_key_control *mask_enc_ctl =
 182                         skb_flow_dissector_target(flow->dissector,
 183                                                   FLOW_DISSECTOR_KEY_ENC_CONTROL,
 184                                                   flow->mask);
 185                 struct flow_dissector_key_control *enc_ctl =
 186                         skb_flow_dissector_target(flow->dissector,
 187                                                   FLOW_DISSECTOR_KEY_ENC_CONTROL,
 188                                                   flow->key);
 189
 190                 if (mask_enc_ctl->addr_type != 0xffff ||
 191                     enc_ctl->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
 192                         return -EOPNOTSUPP;
 193
 194                 /* These fields are already verified as used. */
 195                 mask_ipv4 =
 196                         skb_flow_dissector_target(flow->dissector,
 197                                                   FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 198                                                   flow->mask);
 199                 if (mask_ipv4->dst != cpu_to_be32(~0))
 200                         return -EOPNOTSUPP;
 201
 202                 mask_enc_ports =
 203                         skb_flow_dissector_target(flow->dissector,
 204                                                   FLOW_DISSECTOR_KEY_ENC_PORTS,
 205                                                   flow->mask);
 206                 enc_ports =
 207                         skb_flow_dissector_target(flow->dissector,
 208                                                   FLOW_DISSECTOR_KEY_ENC_PORTS,
 209                                                   flow->key);
 210
 211                 if (mask_enc_ports->dst != cpu_to_be16(~0))
 212                         return -EOPNOTSUPP;
 213
 214                 if (dissector_uses_key(flow->dissector,
 215                                        FLOW_DISSECTOR_KEY_ENC_OPTS)) {
 216                         enc_op = skb_flow_dissector_target(flow->dissector,
 217                                                            FLOW_DISSECTOR_KEY_ENC_OPTS,
 218                                                            flow->key);
 219                 }
 220
 221                 switch (enc_ports->dst) {
 222                 case htons(NFP_FL_VXLAN_PORT):
 223                         *tun_type = NFP_FL_TUNNEL_VXLAN;
 224                         key_layer |= NFP_FLOWER_LAYER_VXLAN;
 225                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 226
 227                         if (enc_op)
 228                                 return -EOPNOTSUPP;
 229                         break;
 230                 case htons(NFP_FL_GENEVE_PORT):
 231                         if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE))
 232                                 return -EOPNOTSUPP;
 233                         *tun_type = NFP_FL_TUNNEL_GENEVE;
 234                         key_layer |= NFP_FLOWER_LAYER_EXT_META;
 235                         key_size += sizeof(struct nfp_flower_ext_meta);
 236                         key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 237                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 238
 239                         if (!enc_op)
 240                                 break;
 241                         if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT))
 242                                 return -EOPNOTSUPP;
 243                         err = nfp_flower_calc_opt_layer(enc_op, &key_layer_two,
 244                                                         &key_size);
 245                         if (err)
 246                                 return err;
 247                         break;
 248                 default:
 249                         return -EOPNOTSUPP;
 250                 }
 251
 252                 /* Ensure the ingress netdev matches the expected tun type. */
 253                 if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type))
 254                         return -EOPNOTSUPP;
 255         }
 256
 257         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
 258                 mask_basic = skb_flow_dissector_target(flow->dissector,
 259                                                        FLOW_DISSECTOR_KEY_BASIC,
 260                                                        flow->mask);
 261
 262                 key_basic = skb_flow_dissector_target(flow->dissector,
 263                                                       FLOW_DISSECTOR_KEY_BASIC,
 264                                                       flow->key);
 265         }
 266
 267         if (mask_basic && mask_basic->n_proto) {
 268                 /* Ethernet type is present in the key. */
 269                 switch (key_basic->n_proto) {
 270                 case cpu_to_be16(ETH_P_IP):
 271                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 272                         key_size += sizeof(struct nfp_flower_ipv4);
 273                         break;
 274
 275                 case cpu_to_be16(ETH_P_IPV6):
 276                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 277                         key_size += sizeof(struct nfp_flower_ipv6);
 278                         break;
 279
 280                 /* Currently we do not offload ARP
 281                  * because we rely on it to get to the host.
 282                  */
 283                 case cpu_to_be16(ETH_P_ARP):
 284                         return -EOPNOTSUPP;
 285
 286                 case cpu_to_be16(ETH_P_MPLS_UC):
 287                 case cpu_to_be16(ETH_P_MPLS_MC):
 288                         if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 289                                 key_layer |= NFP_FLOWER_LAYER_MAC;
 290                                 key_size += sizeof(struct nfp_flower_mac_mpls);
 291                         }
 292                         break;
 293
 294                 /* Will be included in layer 2. */
 295                 case cpu_to_be16(ETH_P_8021Q):
 296                         break;
 297
 298                 default:
 299                         /* Other ethtype - we need check the masks for the
 300                          * remainder of the key to ensure we can offload.
 301                          */
 302                         if (nfp_flower_check_higher_than_mac(flow))
 303                                 return -EOPNOTSUPP;
 304                         break;
 305                 }
 306         }
 307
 308         if (mask_basic && mask_basic->ip_proto) {
 309                 /* Ethernet type is present in the key. */
 310                 switch (key_basic->ip_proto) {
 311                 case IPPROTO_TCP:
 312                 case IPPROTO_UDP:
 313                 case IPPROTO_SCTP:
 314                 case IPPROTO_ICMP:
 315                 case IPPROTO_ICMPV6:
 316                         key_layer |= NFP_FLOWER_LAYER_TP;
 317                         key_size += sizeof(struct nfp_flower_tp_ports);
 318                         break;
 319                 default:
 320                         /* Other ip proto - we need check the masks for the
 321                          * remainder of the key to ensure we can offload.
 322                          */
 323                         return -EOPNOTSUPP;
 324                 }
 325         }
 326
 327         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_TCP)) {
 328                 struct flow_dissector_key_tcp *tcp;
 329                 u32 tcp_flags;
 330
 331                 tcp = skb_flow_dissector_target(flow->dissector,
 332                                                 FLOW_DISSECTOR_KEY_TCP,
 333                                                 flow->key);
 334                 tcp_flags = be16_to_cpu(tcp->flags);
 335
 336                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS)
 337                         return -EOPNOTSUPP;
 338
 339                 /* We only support PSH and URG flags when either
 340                  * FIN, SYN or RST is present as well.
 341                  */
 342                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 343                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST)))
 344                         return -EOPNOTSUPP;
 345
 346                 /* We need to store TCP flags in the either the IPv4 or IPv6 key
 347                  * space, thus we need to ensure we include a IPv4/IPv6 key
 348                  * layer if we have not done so already.
 349                  */
 350                 if (!key_basic)
 351                         return -EOPNOTSUPP;
 352
 353                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 354                     !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
 355                         switch (key_basic->n_proto) {
 356                         case cpu_to_be16(ETH_P_IP):
 357                                 key_layer |= NFP_FLOWER_LAYER_IPV4;
 358                                 key_size += sizeof(struct nfp_flower_ipv4);
 359                                 break;
 360
 361                         case cpu_to_be16(ETH_P_IPV6):
 362                                 key_layer |= NFP_FLOWER_LAYER_IPV6;
 363                                 key_size += sizeof(struct nfp_flower_ipv6);
 364                                 break;
 365
 366                         default:
 367                                 return -EOPNOTSUPP;
 368                         }
 369                 }
 370         }
 371
 372         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
 373                 struct flow_dissector_key_control *key_ctl;
 374
 375                 key_ctl = skb_flow_dissector_target(flow->dissector,
 376                                                     FLOW_DISSECTOR_KEY_CONTROL,
 377                                                     flow->key);
 378
 379                 if (key_ctl->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 380                         return -EOPNOTSUPP;
 381         }
 382
 383         ret_key_ls->key_layer = key_layer;
 384         ret_key_ls->key_layer_two = key_layer_two;
 385         ret_key_ls->key_size = key_size;
 386
 387         return 0;
 388 }
 389
 390 static struct nfp_fl_payload *
 391 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 392 {
 393         struct nfp_fl_payload *flow_pay;
 394
 395         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 396         if (!flow_pay)
 397                 return NULL;
 398
 399         flow_pay->meta.key_len = key_layer->key_size;
 400         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 401         if (!flow_pay->unmasked_data)
 402                 goto err_free_flow;
 403
 404         flow_pay->meta.mask_len = key_layer->key_size;
 405         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 406         if (!flow_pay->mask_data)
 407                 goto err_free_unmasked;
 408
 409         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 410         if (!flow_pay->action_data)
 411                 goto err_free_mask;
 412
 413         flow_pay->nfp_tun_ipv4_addr = 0;
 414         flow_pay->meta.flags = 0;
 415
 416         return flow_pay;
 417
 418 err_free_mask:
 419         kfree(flow_pay->mask_data);
 420 err_free_unmasked:
 421         kfree(flow_pay->unmasked_data);
 422 err_free_flow:
 423         kfree(flow_pay);
 424         return NULL;
 425 }
 426
 427 /**
 428  * nfp_flower_add_offload() - Adds a new flow to hardware.
 429  * @app:        Pointer to the APP handle
 430  * @netdev:     netdev structure.
 431  * @flow:       TC flower classifier offload structure.
 432  *
 433  * Adds a new flow to the repeated hash structure and action payload.
 434  *
 435  * Return: negative value on error, 0 if configured successfully.
 436  */
 437 static int
 438 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 439                        struct tc_cls_flower_offload *flow)
 440 {
 441         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 442         struct nfp_flower_priv *priv = app->priv;
 443         struct nfp_fl_payload *flow_pay;
 444         struct nfp_fl_key_ls *key_layer;
 445         struct nfp_port *port = NULL;
 446         int err;
 447
 448         if (nfp_netdev_is_nfp_repr(netdev))
 449                 port = nfp_port_from_netdev(netdev);
 450
 451         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 452         if (!key_layer)
 453                 return -ENOMEM;
 454
 455         err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
 456                                               &tun_type);
 457         if (err)
 458                 goto err_free_key_ls;
 459
 460         flow_pay = nfp_flower_allocate_new(key_layer);
 461         if (!flow_pay) {
 462                 err = -ENOMEM;
 463                 goto err_free_key_ls;
 464         }
 465
 466         err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
 467                                             flow_pay, tun_type);
 468         if (err)
 469                 goto err_destroy_flow;
 470
 471         err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 472         if (err)
 473                 goto err_destroy_flow;
 474
 475         err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev);
 476         if (err)
 477                 goto err_destroy_flow;
 478
 479         flow_pay->tc_flower_cookie = flow->cookie;
 480         err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
 481                                      nfp_flower_table_params);
 482         if (err)
 483                 goto err_release_metadata;
 484
 485         err = nfp_flower_xmit_flow(app, flow_pay,
 486                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 487         if (err)
 488                 goto err_remove_rhash;
 489
 490         if (port)
 491                 port->tc_offload_cnt++;
 492
 493         /* Deallocate flow payload when flower rule has been destroyed. */
 494         kfree(key_layer);
 495
 496         return 0;
 497
 498 err_remove_rhash:
 499         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 500                                             &flow_pay->fl_node,
 501                                             nfp_flower_table_params));
 502 err_release_metadata:
 503         nfp_modify_flow_metadata(app, flow_pay);
 504 err_destroy_flow:
 505         kfree(flow_pay->action_data);
 506         kfree(flow_pay->mask_data);
 507         kfree(flow_pay->unmasked_data);
 508         kfree(flow_pay);
 509 err_free_key_ls:
 510         kfree(key_layer);
 511         return err;
 512 }
 513
 514 /**
 515  * nfp_flower_del_offload() - Removes a flow from hardware.
 516  * @app:        Pointer to the APP handle
 517  * @netdev:     netdev structure.
 518  * @flow:       TC flower classifier offload structure
 519  *
 520  * Removes a flow from the repeated hash structure and clears the
 521  * action payload.
 522  *
 523  * Return: negative value on error, 0 if removed successfully.
 524  */
 525 static int
 526 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 527                        struct tc_cls_flower_offload *flow)
 528 {
 529         struct nfp_flower_priv *priv = app->priv;
 530         struct nfp_fl_payload *nfp_flow;
 531         struct nfp_port *port = NULL;
 532         int err;
 533
 534         if (nfp_netdev_is_nfp_repr(netdev))
 535                 port = nfp_port_from_netdev(netdev);
 536
 537         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 538         if (!nfp_flow)
 539                 return -ENOENT;
 540
 541         err = nfp_modify_flow_metadata(app, nfp_flow);
 542         if (err)
 543                 goto err_free_flow;
 544
 545         if (nfp_flow->nfp_tun_ipv4_addr)
 546                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 547
 548         err = nfp_flower_xmit_flow(app, nfp_flow,
 549                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 550         if (err)
 551                 goto err_free_flow;
 552
 553 err_free_flow:
 554         if (port)
 555                 port->tc_offload_cnt--;
 556         kfree(nfp_flow->action_data);
 557         kfree(nfp_flow->mask_data);
 558         kfree(nfp_flow->unmasked_data);
 559         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 560                                             &nfp_flow->fl_node,
 561                                             nfp_flower_table_params));
 562         kfree_rcu(nfp_flow, rcu);
 563         return err;
 564 }
 565
 566 /**
 567  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 568  * @app:        Pointer to the APP handle
 569  * @netdev:     Netdev structure.
 570  * @flow:       TC flower classifier offload structure
 571  *
 572  * Populates a flow statistics structure which which corresponds to a
 573  * specific flow.
 574  *
 575  * Return: negative value on error, 0 if stats populated successfully.
 576  */
 577 static int
 578 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 579                      struct tc_cls_flower_offload *flow)
 580 {
 581         struct nfp_flower_priv *priv = app->priv;
 582         struct nfp_fl_payload *nfp_flow;
 583         u32 ctx_id;
 584
 585         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 586         if (!nfp_flow)
 587                 return -EINVAL;
 588
 589         ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
 590
 591         spin_lock_bh(&priv->stats_lock);
 592         tcf_exts_stats_update(flow->exts, priv->stats[ctx_id].bytes,
 593                               priv->stats[ctx_id].pkts,
 594                               priv->stats[ctx_id].used);
 595
 596         priv->stats[ctx_id].pkts = 0;
 597         priv->stats[ctx_id].bytes = 0;
 598         spin_unlock_bh(&priv->stats_lock);
 599
 600         return 0;
 601 }
 602
 603 static int
 604 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 605                         struct tc_cls_flower_offload *flower)
 606 {
 607         if (!eth_proto_is_802_3(flower->common.protocol))
 608                 return -EOPNOTSUPP;
 609
 610         switch (flower->command) {
 611         case TC_CLSFLOWER_REPLACE:
 612                 return nfp_flower_add_offload(app, netdev, flower);
 613         case TC_CLSFLOWER_DESTROY:
 614                 return nfp_flower_del_offload(app, netdev, flower);
 615         case TC_CLSFLOWER_STATS:
 616                 return nfp_flower_get_stats(app, netdev, flower);
 617         default:
 618                 return -EOPNOTSUPP;
 619         }
 620 }
 621
 622 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 623                                         void *type_data, void *cb_priv)
 624 {
 625         struct nfp_repr *repr = cb_priv;
 626
 627         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 628                 return -EOPNOTSUPP;
 629
 630         switch (type) {
 631         case TC_SETUP_CLSFLOWER:
 632                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 633                                                type_data);
 634         default:
 635                 return -EOPNOTSUPP;
 636         }
 637 }
 638
 639 static int nfp_flower_setup_tc_block(struct net_device *netdev,
 640                                      struct tc_block_offload *f)
 641 {
 642         struct nfp_repr *repr = netdev_priv(netdev);
 643
 644         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 645                 return -EOPNOTSUPP;
 646
 647         switch (f->command) {
 648         case TC_BLOCK_BIND:
 649                 return tcf_block_cb_register(f->block,
 650                                              nfp_flower_setup_tc_block_cb,
 651                                              repr, repr, f->extack);
 652         case TC_BLOCK_UNBIND:
 653                 tcf_block_cb_unregister(f->block,
 654                                         nfp_flower_setup_tc_block_cb,
 655                                         repr);
 656                 return 0;
 657         default:
 658                 return -EOPNOTSUPP;
 659         }
 660 }
 661
 662 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 663                         enum tc_setup_type type, void *type_data)
 664 {
 665         switch (type) {
 666         case TC_SETUP_BLOCK:
 667                 return nfp_flower_setup_tc_block(netdev, type_data);
 668         default:
 669                 return -EOPNOTSUPP;
 670         }
 671 }
 672
 673 struct nfp_flower_indr_block_cb_priv {
 674         struct net_device *netdev;
 675         struct nfp_app *app;
 676         struct list_head list;
 677 };
 678
 679 static struct nfp_flower_indr_block_cb_priv *
 680 nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
 681                                      struct net_device *netdev)
 682 {
 683         struct nfp_flower_indr_block_cb_priv *cb_priv;
 684         struct nfp_flower_priv *priv = app->priv;
 685
 686         /* All callback list access should be protected by RTNL. */
 687         ASSERT_RTNL();
 688
 689         list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
 690                 if (cb_priv->netdev == netdev)
 691                         return cb_priv;
 692
 693         return NULL;
 694 }
 695
 696 static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
 697                                           void *type_data, void *cb_priv)
 698 {
 699         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
 700         struct tc_cls_flower_offload *flower = type_data;
 701
 702         if (flower->common.chain_index)
 703                 return -EOPNOTSUPP;
 704
 705         switch (type) {
 706         case TC_SETUP_CLSFLOWER:
 707                 return nfp_flower_repr_offload(priv->app, priv->netdev,
 708                                                type_data);
 709         default:
 710                 return -EOPNOTSUPP;
 711         }
 712 }
 713
 714 static int
 715 nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
 716                                struct tc_block_offload *f)
 717 {
 718         struct nfp_flower_indr_block_cb_priv *cb_priv;
 719         struct nfp_flower_priv *priv = app->priv;
 720         int err;
 721
 722         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 723                 return -EOPNOTSUPP;
 724
 725         switch (f->command) {
 726         case TC_BLOCK_BIND:
 727                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
 728                 if (!cb_priv)
 729                         return -ENOMEM;
 730
 731                 cb_priv->netdev = netdev;
 732                 cb_priv->app = app;
 733                 list_add(&cb_priv->list, &priv->indr_block_cb_priv);
 734
 735                 err = tcf_block_cb_register(f->block,
 736                                             nfp_flower_setup_indr_block_cb,
 737                                             cb_priv, cb_priv, f->extack);
 738                 if (err) {
 739                         list_del(&cb_priv->list);
 740                         kfree(cb_priv);
 741                 }
 742
 743                 return err;
 744         case TC_BLOCK_UNBIND:
 745                 cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
 746                 if (!cb_priv)
 747                         return -ENOENT;
 748
 749                 tcf_block_cb_unregister(f->block,
 750                                         nfp_flower_setup_indr_block_cb,
 751                                         cb_priv);
 752                 list_del(&cb_priv->list);
 753                 kfree(cb_priv);
 754
 755                 return 0;
 756         default:
 757                 return -EOPNOTSUPP;
 758         }
 759         return 0;
 760 }
 761
 762 static int
 763 nfp_flower_indr_setup_tc_cb(struct net_device *netdev, void *cb_priv,
 764                             enum tc_setup_type type, void *type_data)
 765 {
 766         switch (type) {
 767         case TC_SETUP_BLOCK:
 768                 return nfp_flower_setup_indr_tc_block(netdev, cb_priv,
 769                                                       type_data);
 770         default:
 771                 return -EOPNOTSUPP;
 772         }
 773 }
 774
 775 int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
 776                                        struct net_device *netdev,
 777                                        unsigned long event)
 778 {
 779         int err;
 780
 781         if (!nfp_fl_is_netdev_to_offload(netdev))
 782                 return NOTIFY_OK;
 783
 784         if (event == NETDEV_REGISTER) {
 785                 err = __tc_indr_block_cb_register(netdev, app,
 786                                                   nfp_flower_indr_setup_tc_cb,
 787                                                   app);
 788                 if (err)
 789                         nfp_flower_cmsg_warn(app,
 790                                              "Indirect block reg failed - %s\n",
 791                                              netdev->name);
 792         } else if (event == NETDEV_UNREGISTER) {
 793                 __tc_indr_block_cb_unregister(netdev,
 794                                               nfp_flower_indr_setup_tc_cb, app);
 795         }
 796
 797         return NOTIFY_OK;
 798 }