LXR linux/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_ENC_OPTS) | \
  70         BIT(FLOW_DISSECTOR_KEY_MPLS) | \
  71         BIT(FLOW_DISSECTOR_KEY_IP))
  72
  73#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
  74        (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  75         BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  76         BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  77         BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  78         BIT(FLOW_DISSECTOR_KEY_ENC_OPTS) | \
  79         BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  80
  81#define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
  82        (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  83         BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  84         BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  85
  86static int
  87nfp_flower_xmit_flow(struct net_device *netdev,
  88                     struct nfp_fl_payload *nfp_flow, u8 mtype)
  89{
  90        u32 meta_len, key_len, mask_len, act_len, tot_len;
  91        struct nfp_repr *priv = netdev_priv(netdev);
  92        struct sk_buff *skb;
  93        unsigned char *msg;
  94
  95        meta_len =  sizeof(struct nfp_fl_rule_metadata);
  96        key_len = nfp_flow->meta.key_len;
  97        mask_len = nfp_flow->meta.mask_len;
  98        act_len = nfp_flow->meta.act_len;
  99
 100        tot_len = meta_len + key_len + mask_len + act_len;
 101
 102        /* Convert to long words as firmware expects
 103         * lengths in units of NFP_FL_LW_SIZ.
 104         */
 105        nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ;
 106        nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ;
 107        nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ;
 108
 109        skb = nfp_flower_cmsg_alloc(priv->app, tot_len, mtype, GFP_KERNEL);
 110        if (!skb)
 111                return -ENOMEM;
 112
 113        msg = nfp_flower_cmsg_get_data(skb);
 114        memcpy(msg, &nfp_flow->meta, meta_len);
 115        memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
 116        memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
 117        memcpy(&msg[meta_len + key_len + mask_len],
 118               nfp_flow->action_data, act_len);
 119
 120        /* Convert back to bytes as software expects
 121         * lengths in units of bytes.
 122         */
 123        nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
 124        nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
 125        nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
 126
 127        nfp_ctrl_tx(priv->app->ctrl, skb);
 128
 129        return 0;
 130}
 131
 132static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
 133{
 134        return dissector_uses_key(f->dissector,
 135                                  FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 136                dissector_uses_key(f->dissector,
 137                                   FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 138                dissector_uses_key(f->dissector,
 139                                   FLOW_DISSECTOR_KEY_PORTS) ||
 140                dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP);
 141}
 142
 143static int
 144nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
 145                          u32 *key_layer_two, int *key_size)
 146{
 147        if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY)
 148                return -EOPNOTSUPP;
 149
 150        if (enc_opts->len > 0) {
 151                *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 152                *key_size += sizeof(struct nfp_flower_geneve_options);
 153        }
 154
 155        return 0;
 156}
 157
 158static int
 159nfp_flower_calculate_key_layers(struct nfp_app *app,
 160                                struct nfp_fl_key_ls *ret_key_ls,
 161                                struct tc_cls_flower_offload *flow,
 162                                bool egress,
 163                                enum nfp_flower_tun_type *tun_type)
 164{
 165        struct flow_dissector_key_basic *mask_basic = NULL;
 166        struct flow_dissector_key_basic *key_basic = NULL;
 167        struct nfp_flower_priv *priv = app->priv;
 168        u32 key_layer_two;
 169        u8 key_layer;
 170        int key_size;
 171        int err;
 172
 173        if (flow->dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR)
 174                return -EOPNOTSUPP;
 175
 176        /* If any tun dissector is used then the required set must be used. */
 177        if (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 178            (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 179            != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 180                return -EOPNOTSUPP;
 181
 182        key_layer_two = 0;
 183        key_layer = NFP_FLOWER_LAYER_PORT;
 184        key_size = sizeof(struct nfp_flower_meta_tci) +
 185                   sizeof(struct nfp_flower_in_port);
 186
 187        if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 188            dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_MPLS)) {
 189                key_layer |= NFP_FLOWER_LAYER_MAC;
 190                key_size += sizeof(struct nfp_flower_mac_mpls);
 191        }
 192
 193        if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_VLAN)) {
 194                struct flow_dissector_key_vlan *flow_vlan;
 195
 196                flow_vlan = skb_flow_dissector_target(flow->dissector,
 197                                                      FLOW_DISSECTOR_KEY_VLAN,
 198                                                      flow->mask);
 199                if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 200                    flow_vlan->vlan_priority)
 201                        return -EOPNOTSUPP;
 202        }
 203
 204        if (dissector_uses_key(flow->dissector,
 205                               FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 206                struct flow_dissector_key_ipv4_addrs *mask_ipv4 = NULL;
 207                struct flow_dissector_key_ports *mask_enc_ports = NULL;
 208                struct flow_dissector_key_enc_opts *enc_op = NULL;
 209                struct flow_dissector_key_ports *enc_ports = NULL;
 210                struct flow_dissector_key_control *mask_enc_ctl =
 211                        skb_flow_dissector_target(flow->dissector,
 212                                                  FLOW_DISSECTOR_KEY_ENC_CONTROL,
 213                                                  flow->mask);
 214                struct flow_dissector_key_control *enc_ctl =
 215                        skb_flow_dissector_target(flow->dissector,
 216                                                  FLOW_DISSECTOR_KEY_ENC_CONTROL,
 217                                                  flow->key);
 218                if (!egress)
 219                        return -EOPNOTSUPP;
 220
 221                if (mask_enc_ctl->addr_type != 0xffff ||
 222                    enc_ctl->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
 223                        return -EOPNOTSUPP;
 224
 225                /* These fields are already verified as used. */
 226                mask_ipv4 =
 227                        skb_flow_dissector_target(flow->dissector,
 228                                                  FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 229                                                  flow->mask);
 230                if (mask_ipv4->dst != cpu_to_be32(~0))
 231                        return -EOPNOTSUPP;
 232
 233                mask_enc_ports =
 234                        skb_flow_dissector_target(flow->dissector,
 235                                                  FLOW_DISSECTOR_KEY_ENC_PORTS,
 236                                                  flow->mask);
 237                enc_ports =
 238                        skb_flow_dissector_target(flow->dissector,
 239                                                  FLOW_DISSECTOR_KEY_ENC_PORTS,
 240                                                  flow->key);
 241
 242                if (mask_enc_ports->dst != cpu_to_be16(~0))
 243                        return -EOPNOTSUPP;
 244
 245                if (dissector_uses_key(flow->dissector,
 246                                       FLOW_DISSECTOR_KEY_ENC_OPTS)) {
 247                        enc_op = skb_flow_dissector_target(flow->dissector,
 248                                                           FLOW_DISSECTOR_KEY_ENC_OPTS,
 249                                                           flow->key);
 250                }
 251
 252                switch (enc_ports->dst) {
 253                case htons(NFP_FL_VXLAN_PORT):
 254                        *tun_type = NFP_FL_TUNNEL_VXLAN;
 255                        key_layer |= NFP_FLOWER_LAYER_VXLAN;
 256                        key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 257
 258                        if (enc_op)
 259                                return -EOPNOTSUPP;
 260                        break;
 261                case htons(NFP_FL_GENEVE_PORT):
 262                        if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE))
 263                                return -EOPNOTSUPP;
 264                        *tun_type = NFP_FL_TUNNEL_GENEVE;
 265                        key_layer |= NFP_FLOWER_LAYER_EXT_META;
 266                        key_size += sizeof(struct nfp_flower_ext_meta);
 267                        key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 268                        key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 269
 270                        if (!enc_op)
 271                                break;
 272                        if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT))
 273                                return -EOPNOTSUPP;
 274                        err = nfp_flower_calc_opt_layer(enc_op, &key_layer_two,
 275                                                        &key_size);
 276                        if (err)
 277                                return err;
 278                        break;
 279                default:
 280                        return -EOPNOTSUPP;
 281                }
 282        } else if (egress) {
 283                /* Reject non tunnel matches offloaded to egress repr. */
 284                return -EOPNOTSUPP;
 285        }
 286
 287        if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
 288                mask_basic = skb_flow_dissector_target(flow->dissector,
 289                                                       FLOW_DISSECTOR_KEY_BASIC,
 290                                                       flow->mask);
 291
 292                key_basic = skb_flow_dissector_target(flow->dissector,
 293                                                      FLOW_DISSECTOR_KEY_BASIC,
 294                                                      flow->key);
 295        }
 296
 297        if (mask_basic && mask_basic->n_proto) {
 298                /* Ethernet type is present in the key. */
 299                switch (key_basic->n_proto) {
 300                case cpu_to_be16(ETH_P_IP):
 301                        key_layer |= NFP_FLOWER_LAYER_IPV4;
 302                        key_size += sizeof(struct nfp_flower_ipv4);
 303                        break;
 304
 305                case cpu_to_be16(ETH_P_IPV6):
 306                        key_layer |= NFP_FLOWER_LAYER_IPV6;
 307                        key_size += sizeof(struct nfp_flower_ipv6);
 308                        break;
 309
 310                /* Currently we do not offload ARP
 311                 * because we rely on it to get to the host.
 312                 */
 313                case cpu_to_be16(ETH_P_ARP):
 314                        return -EOPNOTSUPP;
 315
 316                case cpu_to_be16(ETH_P_MPLS_UC):
 317                case cpu_to_be16(ETH_P_MPLS_MC):
 318                        if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 319                                key_layer |= NFP_FLOWER_LAYER_MAC;
 320                                key_size += sizeof(struct nfp_flower_mac_mpls);
 321                        }
 322                        break;
 323
 324                /* Will be included in layer 2. */
 325                case cpu_to_be16(ETH_P_8021Q):
 326                        break;
 327
 328                default:
 329                        /* Other ethtype - we need check the masks for the
 330                         * remainder of the key to ensure we can offload.
 331                         */
 332                        if (nfp_flower_check_higher_than_mac(flow))
 333                                return -EOPNOTSUPP;
 334                        break;
 335                }
 336        }
 337
 338        if (mask_basic && mask_basic->ip_proto) {
 339                /* Ethernet type is present in the key. */
 340                switch (key_basic->ip_proto) {
 341                case IPPROTO_TCP:
 342                case IPPROTO_UDP:
 343                case IPPROTO_SCTP:
 344                case IPPROTO_ICMP:
 345                case IPPROTO_ICMPV6:
 346                        key_layer |= NFP_FLOWER_LAYER_TP;
 347                        key_size += sizeof(struct nfp_flower_tp_ports);
 348                        break;
 349                default:
 350                        /* Other ip proto - we need check the masks for the
 351                         * remainder of the key to ensure we can offload.
 352                         */
 353                        return -EOPNOTSUPP;
 354                }
 355        }
 356
 357        if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_TCP)) {
 358                struct flow_dissector_key_tcp *tcp;
 359                u32 tcp_flags;
 360
 361                tcp = skb_flow_dissector_target(flow->dissector,
 362                                                FLOW_DISSECTOR_KEY_TCP,
 363                                                flow->key);
 364                tcp_flags = be16_to_cpu(tcp->flags);
 365
 366                if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS)
 367                        return -EOPNOTSUPP;
 368
 369                /* We only support PSH and URG flags when either
 370                 * FIN, SYN or RST is present as well.
 371                 */
 372                if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 373                    !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST)))
 374                        return -EOPNOTSUPP;
 375
 376                /* We need to store TCP flags in the IPv4 key space, thus
 377                 * we need to ensure we include a IPv4 key layer if we have
 378                 * not done so already.
 379                 */
 380                if (!(key_layer & NFP_FLOWER_LAYER_IPV4)) {
 381                        key_layer |= NFP_FLOWER_LAYER_IPV4;
 382                        key_size += sizeof(struct nfp_flower_ipv4);
 383                }
 384        }
 385
 386        if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
 387                struct flow_dissector_key_control *key_ctl;
 388
 389                key_ctl = skb_flow_dissector_target(flow->dissector,
 390                                                    FLOW_DISSECTOR_KEY_CONTROL,
 391                                                    flow->key);
 392
 393                if (key_ctl->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 394                        return -EOPNOTSUPP;
 395        }
 396
 397        ret_key_ls->key_layer = key_layer;
 398        ret_key_ls->key_layer_two = key_layer_two;
 399        ret_key_ls->key_size = key_size;
 400
 401        return 0;
 402}
 403
 404static struct nfp_fl_payload *
 405nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer, bool egress)
 406{
 407        struct nfp_fl_payload *flow_pay;
 408
 409        flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 410        if (!flow_pay)
 411                return NULL;
 412
 413        flow_pay->meta.key_len = key_layer->key_size;
 414        flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 415        if (!flow_pay->unmasked_data)
 416                goto err_free_flow;
 417
 418        flow_pay->meta.mask_len = key_layer->key_size;
 419        flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 420        if (!flow_pay->mask_data)
 421                goto err_free_unmasked;
 422
 423        flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 424        if (!flow_pay->action_data)
 425                goto err_free_mask;
 426
 427        flow_pay->nfp_tun_ipv4_addr = 0;
 428        flow_pay->meta.flags = 0;
 429        flow_pay->ingress_offload = !egress;
 430
 431        return flow_pay;
 432
 433err_free_mask:
 434        kfree(flow_pay->mask_data);
 435err_free_unmasked:
 436        kfree(flow_pay->unmasked_data);
 437err_free_flow:
 438        kfree(flow_pay);
 439        return NULL;
 440}
 441
 442/**
 443 * nfp_flower_add_offload() - Adds a new flow to hardware.
 444 * @app:        Pointer to the APP handle
 445 * @netdev:     netdev structure.
 446 * @flow:       TC flower classifier offload structure.
 447 * @egress:     NFP netdev is the egress.
 448 *
 449 * Adds a new flow to the repeated hash structure and action payload.
 450 *
 451 * Return: negative value on error, 0 if configured successfully.
 452 */
 453static int
 454nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 455                       struct tc_cls_flower_offload *flow, bool egress)
 456{
 457        enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 458        struct nfp_port *port = nfp_port_from_netdev(netdev);
 459        struct nfp_flower_priv *priv = app->priv;
 460        struct nfp_fl_payload *flow_pay;
 461        struct nfp_fl_key_ls *key_layer;
 462        struct net_device *ingr_dev;
 463        int err;
 464
 465        ingr_dev = egress ? NULL : netdev;
 466        flow_pay = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 467                                              NFP_FL_STATS_CTX_DONT_CARE);
 468        if (flow_pay) {
 469                /* Ignore as duplicate if it has been added by different cb. */
 470                if (flow_pay->ingress_offload && egress)
 471                        return 0;
 472                else
 473                        return -EOPNOTSUPP;
 474        }
 475
 476        key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 477        if (!key_layer)
 478                return -ENOMEM;
 479
 480        err = nfp_flower_calculate_key_layers(app, key_layer, flow, egress,
 481                                              &tun_type);
 482        if (err)
 483                goto err_free_key_ls;
 484
 485        flow_pay = nfp_flower_allocate_new(key_layer, egress);
 486        if (!flow_pay) {
 487                err = -ENOMEM;
 488                goto err_free_key_ls;
 489        }
 490
 491        flow_pay->ingress_dev = egress ? NULL : netdev;
 492
 493        err = nfp_flower_compile_flow_match(flow, key_layer, netdev, flow_pay,
 494                                            tun_type);
 495        if (err)
 496                goto err_destroy_flow;
 497
 498        err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 499        if (err)
 500                goto err_destroy_flow;
 501
 502        err = nfp_compile_flow_metadata(app, flow, flow_pay,
 503                                        flow_pay->ingress_dev);
 504        if (err)
 505                goto err_destroy_flow;
 506
 507        err = nfp_flower_xmit_flow(netdev, flow_pay,
 508                                   NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 509        if (err)
 510                goto err_destroy_flow;
 511
 512        flow_pay->tc_flower_cookie = flow->cookie;
 513        err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
 514                                     nfp_flower_table_params);
 515        if (err)
 516                goto err_destroy_flow;
 517
 518        port->tc_offload_cnt++;
 519
 520        /* Deallocate flow payload when flower rule has been destroyed. */
 521        kfree(key_layer);
 522
 523        return 0;
 524
 525err_destroy_flow:
 526        kfree(flow_pay->action_data);
 527        kfree(flow_pay->mask_data);
 528        kfree(flow_pay->unmasked_data);
 529        kfree(flow_pay);
 530err_free_key_ls:
 531        kfree(key_layer);
 532        return err;
 533}
 534
 535/**
 536 * nfp_flower_del_offload() - Removes a flow from hardware.
 537 * @app:        Pointer to the APP handle
 538 * @netdev:     netdev structure.
 539 * @flow:       TC flower classifier offload structure
 540 * @egress:     Netdev is the egress dev.
 541 *
 542 * Removes a flow from the repeated hash structure and clears the
 543 * action payload.
 544 *
 545 * Return: negative value on error, 0 if removed successfully.
 546 */
 547static int
 548nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 549                       struct tc_cls_flower_offload *flow, bool egress)
 550{
 551        struct nfp_port *port = nfp_port_from_netdev(netdev);
 552        struct nfp_flower_priv *priv = app->priv;
 553        struct nfp_fl_payload *nfp_flow;
 554        struct net_device *ingr_dev;
 555        int err;
 556
 557        ingr_dev = egress ? NULL : netdev;
 558        nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 559                                              NFP_FL_STATS_CTX_DONT_CARE);
 560        if (!nfp_flow)
 561                return egress ? 0 : -ENOENT;
 562
 563        err = nfp_modify_flow_metadata(app, nfp_flow);
 564        if (err)
 565                goto err_free_flow;
 566
 567        if (nfp_flow->nfp_tun_ipv4_addr)
 568                nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 569
 570        err = nfp_flower_xmit_flow(netdev, nfp_flow,
 571                                   NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 572        if (err)
 573                goto err_free_flow;
 574
 575err_free_flow:
 576        port->tc_offload_cnt--;
 577        kfree(nfp_flow->action_data);
 578        kfree(nfp_flow->mask_data);
 579        kfree(nfp_flow->unmasked_data);
 580        WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 581                                            &nfp_flow->fl_node,
 582                                            nfp_flower_table_params));
 583        kfree_rcu(nfp_flow, rcu);
 584        return err;
 585}
 586
 587/**
 588 * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 589 * @app:        Pointer to the APP handle
 590 * @netdev:     Netdev structure.
 591 * @flow:       TC flower classifier offload structure
 592 * @egress:     Netdev is the egress dev.
 593 *
 594 * Populates a flow statistics structure which which corresponds to a
 595 * specific flow.
 596 *
 597 * Return: negative value on error, 0 if stats populated successfully.
 598 */
 599static int
 600nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 601                     struct tc_cls_flower_offload *flow, bool egress)
 602{
 603        struct nfp_flower_priv *priv = app->priv;
 604        struct nfp_fl_payload *nfp_flow;
 605        struct net_device *ingr_dev;
 606        u32 ctx_id;
 607
 608        ingr_dev = egress ? NULL : netdev;
 609        nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 610                                              NFP_FL_STATS_CTX_DONT_CARE);
 611        if (!nfp_flow)
 612                return -EINVAL;
 613
 614        if (nfp_flow->ingress_offload && egress)
 615                return 0;
 616
 617        ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
 618
 619        spin_lock_bh(&priv->stats_lock);
 620        tcf_exts_stats_update(flow->exts, priv->stats[ctx_id].bytes,
 621                              priv->stats[ctx_id].pkts,
 622                              priv->stats[ctx_id].used);
 623
 624        priv->stats[ctx_id].pkts = 0;
 625        priv->stats[ctx_id].bytes = 0;
 626        spin_unlock_bh(&priv->stats_lock);
 627
 628        return 0;
 629}
 630
 631static int
 632nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 633                        struct tc_cls_flower_offload *flower, bool egress)
 634{
 635        if (!eth_proto_is_802_3(flower->common.protocol))
 636                return -EOPNOTSUPP;
 637
 638        switch (flower->command) {
 639        case TC_CLSFLOWER_REPLACE:
 640                return nfp_flower_add_offload(app, netdev, flower, egress);
 641        case TC_CLSFLOWER_DESTROY:
 642                return nfp_flower_del_offload(app, netdev, flower, egress);
 643        case TC_CLSFLOWER_STATS:
 644                return nfp_flower_get_stats(app, netdev, flower, egress);
 645        default:
 646                return -EOPNOTSUPP;
 647        }
 648}
 649
 650int nfp_flower_setup_tc_egress_cb(enum tc_setup_type type, void *type_data,
 651                                  void *cb_priv)
 652{
 653        struct nfp_repr *repr = cb_priv;
 654
 655        if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 656                return -EOPNOTSUPP;
 657
 658        switch (type) {
 659        case TC_SETUP_CLSFLOWER:
 660                return nfp_flower_repr_offload(repr->app, repr->netdev,
 661                                               type_data, true);
 662        default:
 663                return -EOPNOTSUPP;
 664        }
 665}
 666
 667static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 668                                        void *type_data, void *cb_priv)
 669{
 670        struct nfp_repr *repr = cb_priv;
 671
 672        if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 673                return -EOPNOTSUPP;
 674
 675        switch (type) {
 676        case TC_SETUP_CLSFLOWER:
 677                return nfp_flower_repr_offload(repr->app, repr->netdev,
 678                                               type_data, false);
 679        default:
 680                return -EOPNOTSUPP;
 681        }
 682}
 683
 684static int nfp_flower_setup_tc_block(struct net_device *netdev,
 685                                     struct tc_block_offload *f)
 686{
 687        struct nfp_repr *repr = netdev_priv(netdev);
 688
 689        if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 690                return -EOPNOTSUPP;
 691
 692        switch (f->command) {
 693        case TC_BLOCK_BIND:
 694                return tcf_block_cb_register(f->block,
 695                                             nfp_flower_setup_tc_block_cb,
 696                                             repr, repr, f->extack);
 697        case TC_BLOCK_UNBIND:
 698                tcf_block_cb_unregister(f->block,
 699                                        nfp_flower_setup_tc_block_cb,
 700                                        repr);
 701                return 0;
 702        default:
 703                return -EOPNOTSUPP;
 704        }
 705}
 706
 707int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 708                        enum tc_setup_type type, void *type_data)
 709{
 710        switch (type) {
 711        case TC_SETUP_BLOCK:
 712                return nfp_flower_setup_tc_block(netdev, type_data);
 713        default:
 714                return -EOPNOTSUPP;
 715        }
 716}
 717