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 IPv4 key space, thus
 347                  * we need to ensure we include a IPv4 key layer if we have
 348                  * not done so already.
 349                  */
 350                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4)) {
 351                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 352                         key_size += sizeof(struct nfp_flower_ipv4);
 353                 }
 354         }
 355
 356         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
 357                 struct flow_dissector_key_control *key_ctl;
 358
 359                 key_ctl = skb_flow_dissector_target(flow->dissector,
 360                                                     FLOW_DISSECTOR_KEY_CONTROL,
 361                                                     flow->key);
 362
 363                 if (key_ctl->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 364                         return -EOPNOTSUPP;
 365         }
 366
 367         ret_key_ls->key_layer = key_layer;
 368         ret_key_ls->key_layer_two = key_layer_two;
 369         ret_key_ls->key_size = key_size;
 370
 371         return 0;
 372 }
 373
 374 static struct nfp_fl_payload *
 375 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 376 {
 377         struct nfp_fl_payload *flow_pay;
 378
 379         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 380         if (!flow_pay)
 381                 return NULL;
 382
 383         flow_pay->meta.key_len = key_layer->key_size;
 384         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 385         if (!flow_pay->unmasked_data)
 386                 goto err_free_flow;
 387
 388         flow_pay->meta.mask_len = key_layer->key_size;
 389         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 390         if (!flow_pay->mask_data)
 391                 goto err_free_unmasked;
 392
 393         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 394         if (!flow_pay->action_data)
 395                 goto err_free_mask;
 396
 397         flow_pay->nfp_tun_ipv4_addr = 0;
 398         flow_pay->meta.flags = 0;
 399
 400         return flow_pay;
 401
 402 err_free_mask:
 403         kfree(flow_pay->mask_data);
 404 err_free_unmasked:
 405         kfree(flow_pay->unmasked_data);
 406 err_free_flow:
 407         kfree(flow_pay);
 408         return NULL;
 409 }
 410
 411 /**
 412  * nfp_flower_add_offload() - Adds a new flow to hardware.
 413  * @app:        Pointer to the APP handle
 414  * @netdev:     netdev structure.
 415  * @flow:       TC flower classifier offload structure.
 416  *
 417  * Adds a new flow to the repeated hash structure and action payload.
 418  *
 419  * Return: negative value on error, 0 if configured successfully.
 420  */
 421 static int
 422 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 423                        struct tc_cls_flower_offload *flow)
 424 {
 425         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 426         struct nfp_flower_priv *priv = app->priv;
 427         struct nfp_fl_payload *flow_pay;
 428         struct nfp_fl_key_ls *key_layer;
 429         struct nfp_port *port = NULL;
 430         int err;
 431
 432         if (nfp_netdev_is_nfp_repr(netdev))
 433                 port = nfp_port_from_netdev(netdev);
 434
 435         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 436         if (!key_layer)
 437                 return -ENOMEM;
 438
 439         err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
 440                                               &tun_type);
 441         if (err)
 442                 goto err_free_key_ls;
 443
 444         flow_pay = nfp_flower_allocate_new(key_layer);
 445         if (!flow_pay) {
 446                 err = -ENOMEM;
 447                 goto err_free_key_ls;
 448         }
 449
 450         err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
 451                                             flow_pay, tun_type);
 452         if (err)
 453                 goto err_destroy_flow;
 454
 455         err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 456         if (err)
 457                 goto err_destroy_flow;
 458
 459         err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev);
 460         if (err)
 461                 goto err_destroy_flow;
 462
 463         err = nfp_flower_xmit_flow(app, flow_pay,
 464                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 465         if (err)
 466                 goto err_destroy_flow;
 467
 468         flow_pay->tc_flower_cookie = flow->cookie;
 469         err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
 470                                      nfp_flower_table_params);
 471         if (err)
 472                 goto err_destroy_flow;
 473
 474         if (port)
 475                 port->tc_offload_cnt++;
 476
 477         /* Deallocate flow payload when flower rule has been destroyed. */
 478         kfree(key_layer);
 479
 480         return 0;
 481
 482 err_destroy_flow:
 483         kfree(flow_pay->action_data);
 484         kfree(flow_pay->mask_data);
 485         kfree(flow_pay->unmasked_data);
 486         kfree(flow_pay);
 487 err_free_key_ls:
 488         kfree(key_layer);
 489         return err;
 490 }
 491
 492 /**
 493  * nfp_flower_del_offload() - Removes a flow from hardware.
 494  * @app:        Pointer to the APP handle
 495  * @netdev:     netdev structure.
 496  * @flow:       TC flower classifier offload structure
 497  *
 498  * Removes a flow from the repeated hash structure and clears the
 499  * action payload.
 500  *
 501  * Return: negative value on error, 0 if removed successfully.
 502  */
 503 static int
 504 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 505                        struct tc_cls_flower_offload *flow)
 506 {
 507         struct nfp_flower_priv *priv = app->priv;
 508         struct nfp_fl_payload *nfp_flow;
 509         struct nfp_port *port = NULL;
 510         int err;
 511
 512         if (nfp_netdev_is_nfp_repr(netdev))
 513                 port = nfp_port_from_netdev(netdev);
 514
 515         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 516         if (!nfp_flow)
 517                 return -ENOENT;
 518
 519         err = nfp_modify_flow_metadata(app, nfp_flow);
 520         if (err)
 521                 goto err_free_flow;
 522
 523         if (nfp_flow->nfp_tun_ipv4_addr)
 524                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 525
 526         err = nfp_flower_xmit_flow(app, nfp_flow,
 527                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 528         if (err)
 529                 goto err_free_flow;
 530
 531 err_free_flow:
 532         if (port)
 533                 port->tc_offload_cnt--;
 534         kfree(nfp_flow->action_data);
 535         kfree(nfp_flow->mask_data);
 536         kfree(nfp_flow->unmasked_data);
 537         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 538                                             &nfp_flow->fl_node,
 539                                             nfp_flower_table_params));
 540         kfree_rcu(nfp_flow, rcu);
 541         return err;
 542 }
 543
 544 /**
 545  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 546  * @app:        Pointer to the APP handle
 547  * @netdev:     Netdev structure.
 548  * @flow:       TC flower classifier offload structure
 549  *
 550  * Populates a flow statistics structure which which corresponds to a
 551  * specific flow.
 552  *
 553  * Return: negative value on error, 0 if stats populated successfully.
 554  */
 555 static int
 556 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 557                      struct tc_cls_flower_offload *flow)
 558 {
 559         struct nfp_flower_priv *priv = app->priv;
 560         struct nfp_fl_payload *nfp_flow;
 561         u32 ctx_id;
 562
 563         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 564         if (!nfp_flow)
 565                 return -EINVAL;
 566
 567         ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
 568
 569         spin_lock_bh(&priv->stats_lock);
 570         tcf_exts_stats_update(flow->exts, priv->stats[ctx_id].bytes,
 571                               priv->stats[ctx_id].pkts,
 572                               priv->stats[ctx_id].used);
 573
 574         priv->stats[ctx_id].pkts = 0;
 575         priv->stats[ctx_id].bytes = 0;
 576         spin_unlock_bh(&priv->stats_lock);
 577
 578         return 0;
 579 }
 580
 581 static int
 582 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 583                         struct tc_cls_flower_offload *flower)
 584 {
 585         if (!eth_proto_is_802_3(flower->common.protocol))
 586                 return -EOPNOTSUPP;
 587
 588         switch (flower->command) {
 589         case TC_CLSFLOWER_REPLACE:
 590                 return nfp_flower_add_offload(app, netdev, flower);
 591         case TC_CLSFLOWER_DESTROY:
 592                 return nfp_flower_del_offload(app, netdev, flower);
 593         case TC_CLSFLOWER_STATS:
 594                 return nfp_flower_get_stats(app, netdev, flower);
 595         default:
 596                 return -EOPNOTSUPP;
 597         }
 598 }
 599
 600 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 601                                         void *type_data, void *cb_priv)
 602 {
 603         struct nfp_repr *repr = cb_priv;
 604
 605         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 606                 return -EOPNOTSUPP;
 607
 608         switch (type) {
 609         case TC_SETUP_CLSFLOWER:
 610                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 611                                                type_data);
 612         default:
 613                 return -EOPNOTSUPP;
 614         }
 615 }
 616
 617 static int nfp_flower_setup_tc_block(struct net_device *netdev,
 618                                      struct tc_block_offload *f)
 619 {
 620         struct nfp_repr *repr = netdev_priv(netdev);
 621
 622         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 623                 return -EOPNOTSUPP;
 624
 625         switch (f->command) {
 626         case TC_BLOCK_BIND:
 627                 return tcf_block_cb_register(f->block,
 628                                              nfp_flower_setup_tc_block_cb,
 629                                              repr, repr, f->extack);
 630         case TC_BLOCK_UNBIND:
 631                 tcf_block_cb_unregister(f->block,
 632                                         nfp_flower_setup_tc_block_cb,
 633                                         repr);
 634                 return 0;
 635         default:
 636                 return -EOPNOTSUPP;
 637         }
 638 }
 639
 640 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 641                         enum tc_setup_type type, void *type_data)
 642 {
 643         switch (type) {
 644         case TC_SETUP_BLOCK:
 645                 return nfp_flower_setup_tc_block(netdev, type_data);
 646         default:
 647                 return -EOPNOTSUPP;
 648         }
 649 }
 650
 651 struct nfp_flower_indr_block_cb_priv {
 652         struct net_device *netdev;
 653         struct nfp_app *app;
 654         struct list_head list;
 655 };
 656
 657 static struct nfp_flower_indr_block_cb_priv *
 658 nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
 659                                      struct net_device *netdev)
 660 {
 661         struct nfp_flower_indr_block_cb_priv *cb_priv;
 662         struct nfp_flower_priv *priv = app->priv;
 663
 664         /* All callback list access should be protected by RTNL. */
 665         ASSERT_RTNL();
 666
 667         list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
 668                 if (cb_priv->netdev == netdev)
 669                         return cb_priv;
 670
 671         return NULL;
 672 }
 673
 674 static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
 675                                           void *type_data, void *cb_priv)
 676 {
 677         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
 678         struct tc_cls_flower_offload *flower = type_data;
 679
 680         if (flower->common.chain_index)
 681                 return -EOPNOTSUPP;
 682
 683         switch (type) {
 684         case TC_SETUP_CLSFLOWER:
 685                 return nfp_flower_repr_offload(priv->app, priv->netdev,
 686                                                type_data);
 687         default:
 688                 return -EOPNOTSUPP;
 689         }
 690 }
 691
 692 static int
 693 nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
 694                                struct tc_block_offload *f)
 695 {
 696         struct nfp_flower_indr_block_cb_priv *cb_priv;
 697         struct nfp_flower_priv *priv = app->priv;
 698         int err;
 699
 700         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 701                 return -EOPNOTSUPP;
 702
 703         switch (f->command) {
 704         case TC_BLOCK_BIND:
 705                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
 706                 if (!cb_priv)
 707                         return -ENOMEM;
 708
 709                 cb_priv->netdev = netdev;
 710                 cb_priv->app = app;
 711                 list_add(&cb_priv->list, &priv->indr_block_cb_priv);
 712
 713                 err = tcf_block_cb_register(f->block,
 714                                             nfp_flower_setup_indr_block_cb,
 715                                             netdev, cb_priv, f->extack);
 716                 if (err) {
 717                         list_del(&cb_priv->list);
 718                         kfree(cb_priv);
 719                 }
 720
 721                 return err;
 722         case TC_BLOCK_UNBIND:
 723                 tcf_block_cb_unregister(f->block,
 724                                         nfp_flower_setup_indr_block_cb, netdev);
 725                 cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
 726                 if (cb_priv) {
 727                         list_del(&cb_priv->list);
 728                         kfree(cb_priv);
 729                 }
 730
 731                 return 0;
 732         default:
 733                 return -EOPNOTSUPP;
 734         }
 735         return 0;
 736 }
 737
 738 static int
 739 nfp_flower_indr_setup_tc_cb(struct net_device *netdev, void *cb_priv,
 740                             enum tc_setup_type type, void *type_data)
 741 {
 742         switch (type) {
 743         case TC_SETUP_BLOCK:
 744                 return nfp_flower_setup_indr_tc_block(netdev, cb_priv,
 745                                                       type_data);
 746         default:
 747                 return -EOPNOTSUPP;
 748         }
 749 }
 750
 751 int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
 752                                        struct net_device *netdev,
 753                                        unsigned long event)
 754 {
 755         int err;
 756
 757         if (!nfp_fl_is_netdev_to_offload(netdev))
 758                 return NOTIFY_OK;
 759
 760         if (event == NETDEV_REGISTER) {
 761                 err = __tc_indr_block_cb_register(netdev, app,
 762                                                   nfp_flower_indr_setup_tc_cb,
 763                                                   netdev);
 764                 if (err)
 765                         nfp_flower_cmsg_warn(app,
 766                                              "Indirect block reg failed - %s\n",
 767                                              netdev->name);
 768         } else if (event == NETDEV_UNREGISTER) {
 769                 __tc_indr_block_cb_unregister(netdev,
 770                                               nfp_flower_indr_setup_tc_cb,
 771                                               netdev);
 772         }
 773
 774         return NOTIFY_OK;
 775 }