drivers/net/ethernet/netronome/nfp/flower/offload.c

   1 /*
   2  * Copyright (C) 2017 Netronome Systems, Inc.
   3  *
   4  * This software is dual licensed under the GNU General License Version 2,
   5  * June 1991 as shown in the file COPYING in the top-level directory of this
   6  * source tree or the BSD 2-Clause License provided below.  You have the
   7  * option to license this software under the complete terms of either license.
   8  *
   9  * The BSD 2-Clause License:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      1. Redistributions of source code must retain the above
  16  *         copyright notice, this list of conditions and the following
  17  *         disclaimer.
  18  *
  19  *      2. Redistributions in binary form must reproduce the above
  20  *         copyright notice, this list of conditions and the following
  21  *         disclaimer in the documentation and/or other materials
  22  *         provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/skbuff.h>
  35 #include <net/devlink.h>
  36 #include <net/pkt_cls.h>
  37
  38 #include "cmsg.h"
  39 #include "main.h"
  40 #include "../nfpcore/nfp_cpp.h"
  41 #include "../nfpcore/nfp_nsp.h"
  42 #include "../nfp_app.h"
  43 #include "../nfp_main.h"
  44 #include "../nfp_net.h"
  45 #include "../nfp_port.h"
  46
  47 #define NFP_FLOWER_SUPPORTED_TCPFLAGS \
  48         (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | \
  49          TCPHDR_PSH | TCPHDR_URG)
  50
  51 #define NFP_FLOWER_SUPPORTED_CTLFLAGS \
  52         (FLOW_DIS_IS_FRAGMENT | \
  53          FLOW_DIS_FIRST_FRAG)
  54
  55 #define NFP_FLOWER_WHITELIST_DISSECTOR \
  56         (BIT(FLOW_DISSECTOR_KEY_CONTROL) | \
  57          BIT(FLOW_DISSECTOR_KEY_BASIC) | \
  58          BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) | \
  59          BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) | \
  60          BIT(FLOW_DISSECTOR_KEY_TCP) | \
  61          BIT(FLOW_DISSECTOR_KEY_PORTS) | \
  62          BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) | \
  63          BIT(FLOW_DISSECTOR_KEY_VLAN) | \
  64          BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  65          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  66          BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  67          BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  68          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
  69          BIT(FLOW_DISSECTOR_KEY_MPLS) | \
  70          BIT(FLOW_DISSECTOR_KEY_IP))
  71
  72 #define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
  73         (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  74          BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  75          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  76          BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  77          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  78
  79 #define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
  80         (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  81          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  82          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  83
  84 static int
  85 nfp_flower_xmit_flow(struct net_device *netdev,
  86                      struct nfp_fl_payload *nfp_flow, u8 mtype)
  87 {
  88         u32 meta_len, key_len, mask_len, act_len, tot_len;
  89         struct nfp_repr *priv = netdev_priv(netdev);
  90         struct sk_buff *skb;
  91         unsigned char *msg;
  92
  93         meta_len =  sizeof(struct nfp_fl_rule_metadata);
  94         key_len = nfp_flow->meta.key_len;
  95         mask_len = nfp_flow->meta.mask_len;
  96         act_len = nfp_flow->meta.act_len;
  97
  98         tot_len = meta_len + key_len + mask_len + act_len;
  99
 100         /* Convert to long words as firmware expects
 101          * lengths in units of NFP_FL_LW_SIZ.
 102          */
 103         nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
 104         nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
 105         nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;
 106
 107         skb = nfp_flower_cmsg_alloc(priv->app, tot_len, mtype, GFP_KERNEL);
 108         if (!skb)
 109                 return -ENOMEM;
 110
 111         msg = nfp_flower_cmsg_get_data(skb);
 112         memcpy(msg, &nfp_flow->meta, meta_len);
 113         memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
 114         memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
 115         memcpy(&msg[meta_len + key_len + mask_len],
 116                nfp_flow->action_data, act_len);
 117
 118         /* Convert back to bytes as software expects
 119          * lengths in units of bytes.
 120          */
 121         nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
 122         nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
 123         nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
 124
 125         nfp_ctrl_tx(priv->app->ctrl, skb);
 126
 127         return 0;
 128 }
 129
 130 static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
 131 {
 132         return dissector_uses_key(f->dissector,
 133                                   FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 134                 dissector_uses_key(f->dissector,
 135                                    FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 136                 dissector_uses_key(f->dissector,
 137                                    FLOW_DISSECTOR_KEY_PORTS) ||
 138                 dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP);
 139 }
 140
 141 static int
 142 nfp_flower_calculate_key_layers(struct nfp_app *app,
 143                                 struct nfp_fl_key_ls *ret_key_ls,
 144                                 struct tc_cls_flower_offload *flow,
 145                                 bool egress,
 146                                 enum nfp_flower_tun_type *tun_type)
 147 {
 148         struct flow_dissector_key_basic *mask_basic = NULL;
 149         struct flow_dissector_key_basic *key_basic = NULL;
 150         struct nfp_flower_priv *priv = app->priv;
 151         u32 key_layer_two;
 152         u8 key_layer;
 153         int key_size;
 154
 155         if (flow->dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR)
 156                 return -EOPNOTSUPP;
 157
 158         /* If any tun dissector is used then the required set must be used. */
 159         if (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 160             (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 161             != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 162                 return -EOPNOTSUPP;
 163
 164         key_layer_two = 0;
 165         key_layer = NFP_FLOWER_LAYER_PORT;
 166         key_size = sizeof(struct nfp_flower_meta_tci) +
 167                    sizeof(struct nfp_flower_in_port);
 168
 169         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 170             dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 171                 key_layer |= NFP_FLOWER_LAYER_MAC;
 172                 key_size += sizeof(struct nfp_flower_mac_mpls);
 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_ports *enc_ports = NULL;
 180                 struct flow_dissector_key_control *mask_enc_ctl =
 181                         skb_flow_dissector_target(flow->dissector,
 182                                                   FLOW_DISSECTOR_KEY_ENC_CONTROL,
 183                                                   flow->mask);
 184                 struct flow_dissector_key_control *enc_ctl =
 185                         skb_flow_dissector_target(flow->dissector,
 186                                                   FLOW_DISSECTOR_KEY_ENC_CONTROL,
 187                                                   flow->key);
 188                 if (!egress)
 189                         return -EOPNOTSUPP;
 190
 191                 if (mask_enc_ctl->addr_type != 0xffff ||
 192                     enc_ctl->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
 193                         return -EOPNOTSUPP;
 194
 195                 /* These fields are already verified as used. */
 196                 mask_ipv4 =
 197                         skb_flow_dissector_target(flow->dissector,
 198                                                   FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 199                                                   flow->mask);
 200                 if (mask_ipv4->dst != cpu_to_be32(~0))
 201                         return -EOPNOTSUPP;
 202
 203                 mask_enc_ports =
 204                         skb_flow_dissector_target(flow->dissector,
 205                                                   FLOW_DISSECTOR_KEY_ENC_PORTS,
 206                                                   flow->mask);
 207                 enc_ports =
 208                         skb_flow_dissector_target(flow->dissector,
 209                                                   FLOW_DISSECTOR_KEY_ENC_PORTS,
 210                                                   flow->key);
 211
 212                 if (mask_enc_ports->dst != cpu_to_be16(~0))
 213                         return -EOPNOTSUPP;
 214
 215                 switch (enc_ports->dst) {
 216                 case htons(NFP_FL_VXLAN_PORT):
 217                         *tun_type = NFP_FL_TUNNEL_VXLAN;
 218                         key_layer |= NFP_FLOWER_LAYER_VXLAN;
 219                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 220                         break;
 221                 case htons(NFP_FL_GENEVE_PORT):
 222                         if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE))
 223                                 return -EOPNOTSUPP;
 224                         *tun_type = NFP_FL_TUNNEL_GENEVE;
 225                         key_layer |= NFP_FLOWER_LAYER_EXT_META;
 226                         key_size += sizeof(struct nfp_flower_ext_meta);
 227                         key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 228                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 229                         break;
 230                 default:
 231                         return -EOPNOTSUPP;
 232                 }
 233         } else if (egress) {
 234                 /* Reject non tunnel matches offloaded to egress repr. */
 235                 return -EOPNOTSUPP;
 236         }
 237
 238         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
 239                 mask_basic = skb_flow_dissector_target(flow->dissector,
 240                                                        FLOW_DISSECTOR_KEY_BASIC,
 241                                                        flow->mask);
 242
 243                 key_basic = skb_flow_dissector_target(flow->dissector,
 244                                                       FLOW_DISSECTOR_KEY_BASIC,
 245                                                       flow->key);
 246         }
 247
 248         if (mask_basic && mask_basic->n_proto) {
 249                 /* Ethernet type is present in the key. */
 250                 switch (key_basic->n_proto) {
 251                 case cpu_to_be16(ETH_P_IP):
 252                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 253                         key_size += sizeof(struct nfp_flower_ipv4);
 254                         break;
 255
 256                 case cpu_to_be16(ETH_P_IPV6):
 257                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 258                         key_size += sizeof(struct nfp_flower_ipv6);
 259                         break;
 260
 261                 /* Currently we do not offload ARP
 262                  * because we rely on it to get to the host.
 263                  */
 264                 case cpu_to_be16(ETH_P_ARP):
 265                         return -EOPNOTSUPP;
 266
 267                 case cpu_to_be16(ETH_P_MPLS_UC):
 268                 case cpu_to_be16(ETH_P_MPLS_MC):
 269                         if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 270                                 key_layer |= NFP_FLOWER_LAYER_MAC;
 271                                 key_size += sizeof(struct nfp_flower_mac_mpls);
 272                         }
 273                         break;
 274
 275                 /* Will be included in layer 2. */
 276                 case cpu_to_be16(ETH_P_8021Q):
 277                         break;
 278
 279                 default:
 280                         /* Other ethtype - we need check the masks for the
 281                          * remainder of the key to ensure we can offload.
 282                          */
 283                         if (nfp_flower_check_higher_than_mac(flow))
 284                                 return -EOPNOTSUPP;
 285                         break;
 286                 }
 287         }
 288
 289         if (mask_basic && mask_basic->ip_proto) {
 290                 /* Ethernet type is present in the key. */
 291                 switch (key_basic->ip_proto) {
 292                 case IPPROTO_TCP:
 293                 case IPPROTO_UDP:
 294                 case IPPROTO_SCTP:
 295                 case IPPROTO_ICMP:
 296                 case IPPROTO_ICMPV6:
 297                         key_layer |= NFP_FLOWER_LAYER_TP;
 298                         key_size += sizeof(struct nfp_flower_tp_ports);
 299                         break;
 300                 default:
 301                         /* Other ip proto - we need check the masks for the
 302                          * remainder of the key to ensure we can offload.
 303                          */
 304                         return -EOPNOTSUPP;
 305                 }
 306         }
 307
 308         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_TCP)) {
 309                 struct flow_dissector_key_tcp *tcp;
 310                 u32 tcp_flags;
 311
 312                 tcp = skb_flow_dissector_target(flow->dissector,
 313                                                 FLOW_DISSECTOR_KEY_TCP,
 314                                                 flow->key);
 315                 tcp_flags = be16_to_cpu(tcp->flags);
 316
 317                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS)
 318                         return -EOPNOTSUPP;
 319
 320                 /* We only support PSH and URG flags when either
 321                  * FIN, SYN or RST is present as well.
 322                  */
 323                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 324                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST)))
 325                         return -EOPNOTSUPP;
 326
 327                 /* We need to store TCP flags in the IPv4 key space, thus
 328                  * we need to ensure we include a IPv4 key layer if we have
 329                  * not done so already.
 330                  */
 331                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4)) {
 332                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 333                         key_size += sizeof(struct nfp_flower_ipv4);
 334                 }
 335         }
 336
 337         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
 338                 struct flow_dissector_key_control *key_ctl;
 339
 340                 key_ctl = skb_flow_dissector_target(flow->dissector,
 341                                                     FLOW_DISSECTOR_KEY_CONTROL,
 342                                                     flow->key);
 343
 344                 if (key_ctl->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 345                         return -EOPNOTSUPP;
 346         }
 347
 348         ret_key_ls->key_layer = key_layer;
 349         ret_key_ls->key_layer_two = key_layer_two;
 350         ret_key_ls->key_size = key_size;
 351
 352         return 0;
 353 }
 354
 355 static struct nfp_fl_payload *
 356 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer, bool egress)
 357 {
 358         struct nfp_fl_payload *flow_pay;
 359
 360         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 361         if (!flow_pay)
 362                 return NULL;
 363
 364         flow_pay->meta.key_len = key_layer->key_size;
 365         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 366         if (!flow_pay->unmasked_data)
 367                 goto err_free_flow;
 368
 369         flow_pay->meta.mask_len = key_layer->key_size;
 370         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 371         if (!flow_pay->mask_data)
 372                 goto err_free_unmasked;
 373
 374         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 375         if (!flow_pay->action_data)
 376                 goto err_free_mask;
 377
 378         flow_pay->nfp_tun_ipv4_addr = 0;
 379         flow_pay->meta.flags = 0;
 380         spin_lock_init(&flow_pay->lock);
 381
 382         flow_pay->ingress_offload = !egress;
 383
 384         return flow_pay;
 385
 386 err_free_mask:
 387         kfree(flow_pay->mask_data);
 388 err_free_unmasked:
 389         kfree(flow_pay->unmasked_data);
 390 err_free_flow:
 391         kfree(flow_pay);
 392         return NULL;
 393 }
 394
 395 /**
 396  * nfp_flower_add_offload() - Adds a new flow to hardware.
 397  * @app:        Pointer to the APP handle
 398  * @netdev:     netdev structure.
 399  * @flow:       TC flower classifier offload structure.
 400  * @egress:     NFP netdev is the egress.
 401  *
 402  * Adds a new flow to the repeated hash structure and action payload.
 403  *
 404  * Return: negative value on error, 0 if configured successfully.
 405  */
 406 static int
 407 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 408                        struct tc_cls_flower_offload *flow, bool egress)
 409 {
 410         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 411         struct nfp_port *port = nfp_port_from_netdev(netdev);
 412         struct nfp_flower_priv *priv = app->priv;
 413         struct nfp_fl_payload *flow_pay;
 414         struct nfp_fl_key_ls *key_layer;
 415         struct net_device *ingr_dev;
 416         int err;
 417
 418         ingr_dev = egress ? NULL : netdev;
 419         flow_pay = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 420                                               NFP_FL_STATS_CTX_DONT_CARE);
 421         if (flow_pay) {
 422                 /* Ignore as duplicate if it has been added by different cb. */
 423                 if (flow_pay->ingress_offload && egress)
 424                         return 0;
 425                 else
 426                         return -EOPNOTSUPP;
 427         }
 428
 429         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 430         if (!key_layer)
 431                 return -ENOMEM;
 432
 433         err = nfp_flower_calculate_key_layers(app, key_layer, flow, egress,
 434                                               &tun_type);
 435         if (err)
 436                 goto err_free_key_ls;
 437
 438         flow_pay = nfp_flower_allocate_new(key_layer, egress);
 439         if (!flow_pay) {
 440                 err = -ENOMEM;
 441                 goto err_free_key_ls;
 442         }
 443
 444         flow_pay->ingress_dev = egress ? NULL : netdev;
 445
 446         err = nfp_flower_compile_flow_match(flow, key_layer, netdev, flow_pay,
 447                                             tun_type);
 448         if (err)
 449                 goto err_destroy_flow;
 450
 451         err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 452         if (err)
 453                 goto err_destroy_flow;
 454
 455         err = nfp_compile_flow_metadata(app, flow, flow_pay,
 456                                         flow_pay->ingress_dev);
 457         if (err)
 458                 goto err_destroy_flow;
 459
 460         err = nfp_flower_xmit_flow(netdev, flow_pay,
 461                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 462         if (err)
 463                 goto err_destroy_flow;
 464
 465         INIT_HLIST_NODE(&flow_pay->link);
 466         flow_pay->tc_flower_cookie = flow->cookie;
 467         hash_add_rcu(priv->flow_table, &flow_pay->link, flow->cookie);
 468         port->tc_offload_cnt++;
 469
 470         /* Deallocate flow payload when flower rule has been destroyed. */
 471         kfree(key_layer);
 472
 473         return 0;
 474
 475 err_destroy_flow:
 476         kfree(flow_pay->action_data);
 477         kfree(flow_pay->mask_data);
 478         kfree(flow_pay->unmasked_data);
 479         kfree(flow_pay);
 480 err_free_key_ls:
 481         kfree(key_layer);
 482         return err;
 483 }
 484
 485 /**
 486  * nfp_flower_del_offload() - Removes a flow from hardware.
 487  * @app:        Pointer to the APP handle
 488  * @netdev:     netdev structure.
 489  * @flow:       TC flower classifier offload structure
 490  * @egress:     Netdev is the egress dev.
 491  *
 492  * Removes a flow from the repeated hash structure and clears the
 493  * action payload.
 494  *
 495  * Return: negative value on error, 0 if removed successfully.
 496  */
 497 static int
 498 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 499                        struct tc_cls_flower_offload *flow, bool egress)
 500 {
 501         struct nfp_port *port = nfp_port_from_netdev(netdev);
 502         struct nfp_fl_payload *nfp_flow;
 503         struct net_device *ingr_dev;
 504         int err;
 505
 506         ingr_dev = egress ? NULL : netdev;
 507         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 508                                               NFP_FL_STATS_CTX_DONT_CARE);
 509         if (!nfp_flow)
 510                 return egress ? 0 : -ENOENT;
 511
 512         err = nfp_modify_flow_metadata(app, nfp_flow);
 513         if (err)
 514                 goto err_free_flow;
 515
 516         if (nfp_flow->nfp_tun_ipv4_addr)
 517                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 518
 519         err = nfp_flower_xmit_flow(netdev, nfp_flow,
 520                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 521         if (err)
 522                 goto err_free_flow;
 523
 524 err_free_flow:
 525         hash_del_rcu(&nfp_flow->link);
 526         port->tc_offload_cnt--;
 527         kfree(nfp_flow->action_data);
 528         kfree(nfp_flow->mask_data);
 529         kfree(nfp_flow->unmasked_data);
 530         kfree_rcu(nfp_flow, rcu);
 531         return err;
 532 }
 533
 534 /**
 535  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 536  * @app:        Pointer to the APP handle
 537  * @netdev:     Netdev structure.
 538  * @flow:       TC flower classifier offload structure
 539  * @egress:     Netdev is the egress dev.
 540  *
 541  * Populates a flow statistics structure which which corresponds to a
 542  * specific flow.
 543  *
 544  * Return: negative value on error, 0 if stats populated successfully.
 545  */
 546 static int
 547 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 548                      struct tc_cls_flower_offload *flow, bool egress)
 549 {
 550         struct nfp_fl_payload *nfp_flow;
 551         struct net_device *ingr_dev;
 552
 553         ingr_dev = egress ? NULL : netdev;
 554         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 555                                               NFP_FL_STATS_CTX_DONT_CARE);
 556         if (!nfp_flow)
 557                 return -EINVAL;
 558
 559         if (nfp_flow->ingress_offload && egress)
 560                 return 0;
 561
 562         spin_lock_bh(&nfp_flow->lock);
 563         tcf_exts_stats_update(flow->exts, nfp_flow->stats.bytes,
 564                               nfp_flow->stats.pkts, nfp_flow->stats.used);
 565
 566         nfp_flow->stats.pkts = 0;
 567         nfp_flow->stats.bytes = 0;
 568         spin_unlock_bh(&nfp_flow->lock);
 569
 570         return 0;
 571 }
 572
 573 static int
 574 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 575                         struct tc_cls_flower_offload *flower, bool egress)
 576 {
 577         if (!eth_proto_is_802_3(flower->common.protocol))
 578                 return -EOPNOTSUPP;
 579
 580         switch (flower->command) {
 581         case TC_CLSFLOWER_REPLACE:
 582                 return nfp_flower_add_offload(app, netdev, flower, egress);
 583         case TC_CLSFLOWER_DESTROY:
 584                 return nfp_flower_del_offload(app, netdev, flower, egress);
 585         case TC_CLSFLOWER_STATS:
 586                 return nfp_flower_get_stats(app, netdev, flower, egress);
 587         }
 588
 589         return -EOPNOTSUPP;
 590 }
 591
 592 int nfp_flower_setup_tc_egress_cb(enum tc_setup_type type, void *type_data,
 593                                   void *cb_priv)
 594 {
 595         struct nfp_repr *repr = cb_priv;
 596
 597         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 598                 return -EOPNOTSUPP;
 599
 600         switch (type) {
 601         case TC_SETUP_CLSFLOWER:
 602                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 603                                                type_data, true);
 604         default:
 605                 return -EOPNOTSUPP;
 606         }
 607 }
 608
 609 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 610                                         void *type_data, void *cb_priv)
 611 {
 612         struct nfp_repr *repr = cb_priv;
 613
 614         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 615                 return -EOPNOTSUPP;
 616
 617         switch (type) {
 618         case TC_SETUP_CLSFLOWER:
 619                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 620                                                type_data, false);
 621         default:
 622                 return -EOPNOTSUPP;
 623         }
 624 }
 625
 626 static int nfp_flower_setup_tc_block(struct net_device *netdev,
 627                                      struct tc_block_offload *f)
 628 {
 629         struct nfp_repr *repr = netdev_priv(netdev);
 630
 631         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 632                 return -EOPNOTSUPP;
 633
 634         if (tcf_block_shared(f->block))
 635                 return -EOPNOTSUPP;
 636
 637         switch (f->command) {
 638         case TC_BLOCK_BIND:
 639                 return tcf_block_cb_register(f->block,
 640                                              nfp_flower_setup_tc_block_cb,
 641                                              repr, repr);
 642         case TC_BLOCK_UNBIND:
 643                 tcf_block_cb_unregister(f->block,
 644                                         nfp_flower_setup_tc_block_cb,
 645                                         repr);
 646                 return 0;
 647         default:
 648                 return -EOPNOTSUPP;
 649         }
 650 }
 651
 652 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 653                         enum tc_setup_type type, void *type_data)
 654 {
 655         switch (type) {
 656         case TC_SETUP_BLOCK:
 657                 return nfp_flower_setup_tc_block(netdev, type_data);
 658         default:
 659                 return -EOPNOTSUPP;
 660         }
 661 }