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                 /* Will be included in layer 2. */
 268                 case cpu_to_be16(ETH_P_8021Q):
 269                         break;
 270
 271                 default:
 272                         /* Other ethtype - we need check the masks for the
 273                          * remainder of the key to ensure we can offload.
 274                          */
 275                         if (nfp_flower_check_higher_than_mac(flow))
 276                                 return -EOPNOTSUPP;
 277                         break;
 278                 }
 279         }
 280
 281         if (mask_basic && mask_basic->ip_proto) {
 282                 /* Ethernet type is present in the key. */
 283                 switch (key_basic->ip_proto) {
 284                 case IPPROTO_TCP:
 285                 case IPPROTO_UDP:
 286                 case IPPROTO_SCTP:
 287                 case IPPROTO_ICMP:
 288                 case IPPROTO_ICMPV6:
 289                         key_layer |= NFP_FLOWER_LAYER_TP;
 290                         key_size += sizeof(struct nfp_flower_tp_ports);
 291                         break;
 292                 default:
 293                         /* Other ip proto - we need check the masks for the
 294                          * remainder of the key to ensure we can offload.
 295                          */
 296                         return -EOPNOTSUPP;
 297                 }
 298         }
 299
 300         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_TCP)) {
 301                 struct flow_dissector_key_tcp *tcp;
 302                 u32 tcp_flags;
 303
 304                 tcp = skb_flow_dissector_target(flow->dissector,
 305                                                 FLOW_DISSECTOR_KEY_TCP,
 306                                                 flow->key);
 307                 tcp_flags = be16_to_cpu(tcp->flags);
 308
 309                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS)
 310                         return -EOPNOTSUPP;
 311
 312                 /* We only support PSH and URG flags when either
 313                  * FIN, SYN or RST is present as well.
 314                  */
 315                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 316                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST)))
 317                         return -EOPNOTSUPP;
 318
 319                 /* We need to store TCP flags in the IPv4 key space, thus
 320                  * we need to ensure we include a IPv4 key layer if we have
 321                  * not done so already.
 322                  */
 323                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4)) {
 324                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 325                         key_size += sizeof(struct nfp_flower_ipv4);
 326                 }
 327         }
 328
 329         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
 330                 struct flow_dissector_key_control *key_ctl;
 331
 332                 key_ctl = skb_flow_dissector_target(flow->dissector,
 333                                                     FLOW_DISSECTOR_KEY_CONTROL,
 334                                                     flow->key);
 335
 336                 if (key_ctl->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 337                         return -EOPNOTSUPP;
 338         }
 339
 340         ret_key_ls->key_layer = key_layer;
 341         ret_key_ls->key_layer_two = key_layer_two;
 342         ret_key_ls->key_size = key_size;
 343
 344         return 0;
 345 }
 346
 347 static struct nfp_fl_payload *
 348 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer, bool egress)
 349 {
 350         struct nfp_fl_payload *flow_pay;
 351
 352         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 353         if (!flow_pay)
 354                 return NULL;
 355
 356         flow_pay->meta.key_len = key_layer->key_size;
 357         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 358         if (!flow_pay->unmasked_data)
 359                 goto err_free_flow;
 360
 361         flow_pay->meta.mask_len = key_layer->key_size;
 362         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 363         if (!flow_pay->mask_data)
 364                 goto err_free_unmasked;
 365
 366         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 367         if (!flow_pay->action_data)
 368                 goto err_free_mask;
 369
 370         flow_pay->nfp_tun_ipv4_addr = 0;
 371         flow_pay->meta.flags = 0;
 372         spin_lock_init(&flow_pay->lock);
 373
 374         flow_pay->ingress_offload = !egress;
 375
 376         return flow_pay;
 377
 378 err_free_mask:
 379         kfree(flow_pay->mask_data);
 380 err_free_unmasked:
 381         kfree(flow_pay->unmasked_data);
 382 err_free_flow:
 383         kfree(flow_pay);
 384         return NULL;
 385 }
 386
 387 /**
 388  * nfp_flower_add_offload() - Adds a new flow to hardware.
 389  * @app:        Pointer to the APP handle
 390  * @netdev:     netdev structure.
 391  * @flow:       TC flower classifier offload structure.
 392  * @egress:     NFP netdev is the egress.
 393  *
 394  * Adds a new flow to the repeated hash structure and action payload.
 395  *
 396  * Return: negative value on error, 0 if configured successfully.
 397  */
 398 static int
 399 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 400                        struct tc_cls_flower_offload *flow, bool egress)
 401 {
 402         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 403         struct nfp_port *port = nfp_port_from_netdev(netdev);
 404         struct nfp_flower_priv *priv = app->priv;
 405         struct nfp_fl_payload *flow_pay;
 406         struct nfp_fl_key_ls *key_layer;
 407         struct net_device *ingr_dev;
 408         int err;
 409
 410         ingr_dev = egress ? NULL : netdev;
 411         flow_pay = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 412                                               NFP_FL_STATS_CTX_DONT_CARE);
 413         if (flow_pay) {
 414                 /* Ignore as duplicate if it has been added by different cb. */
 415                 if (flow_pay->ingress_offload && egress)
 416                         return 0;
 417                 else
 418                         return -EOPNOTSUPP;
 419         }
 420
 421         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 422         if (!key_layer)
 423                 return -ENOMEM;
 424
 425         err = nfp_flower_calculate_key_layers(app, key_layer, flow, egress,
 426                                               &tun_type);
 427         if (err)
 428                 goto err_free_key_ls;
 429
 430         flow_pay = nfp_flower_allocate_new(key_layer, egress);
 431         if (!flow_pay) {
 432                 err = -ENOMEM;
 433                 goto err_free_key_ls;
 434         }
 435
 436         flow_pay->ingress_dev = egress ? NULL : netdev;
 437
 438         err = nfp_flower_compile_flow_match(flow, key_layer, netdev, flow_pay,
 439                                             tun_type);
 440         if (err)
 441                 goto err_destroy_flow;
 442
 443         err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 444         if (err)
 445                 goto err_destroy_flow;
 446
 447         err = nfp_compile_flow_metadata(app, flow, flow_pay,
 448                                         flow_pay->ingress_dev);
 449         if (err)
 450                 goto err_destroy_flow;
 451
 452         err = nfp_flower_xmit_flow(netdev, flow_pay,
 453                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 454         if (err)
 455                 goto err_destroy_flow;
 456
 457         INIT_HLIST_NODE(&flow_pay->link);
 458         flow_pay->tc_flower_cookie = flow->cookie;
 459         hash_add_rcu(priv->flow_table, &flow_pay->link, flow->cookie);
 460         port->tc_offload_cnt++;
 461
 462         /* Deallocate flow payload when flower rule has been destroyed. */
 463         kfree(key_layer);
 464
 465         return 0;
 466
 467 err_destroy_flow:
 468         kfree(flow_pay->action_data);
 469         kfree(flow_pay->mask_data);
 470         kfree(flow_pay->unmasked_data);
 471         kfree(flow_pay);
 472 err_free_key_ls:
 473         kfree(key_layer);
 474         return err;
 475 }
 476
 477 /**
 478  * nfp_flower_del_offload() - Removes a flow from hardware.
 479  * @app:        Pointer to the APP handle
 480  * @netdev:     netdev structure.
 481  * @flow:       TC flower classifier offload structure
 482  * @egress:     Netdev is the egress dev.
 483  *
 484  * Removes a flow from the repeated hash structure and clears the
 485  * action payload.
 486  *
 487  * Return: negative value on error, 0 if removed successfully.
 488  */
 489 static int
 490 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 491                        struct tc_cls_flower_offload *flow, bool egress)
 492 {
 493         struct nfp_port *port = nfp_port_from_netdev(netdev);
 494         struct nfp_fl_payload *nfp_flow;
 495         struct net_device *ingr_dev;
 496         int err;
 497
 498         ingr_dev = egress ? NULL : netdev;
 499         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 500                                               NFP_FL_STATS_CTX_DONT_CARE);
 501         if (!nfp_flow)
 502                 return egress ? 0 : -ENOENT;
 503
 504         err = nfp_modify_flow_metadata(app, nfp_flow);
 505         if (err)
 506                 goto err_free_flow;
 507
 508         if (nfp_flow->nfp_tun_ipv4_addr)
 509                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 510
 511         err = nfp_flower_xmit_flow(netdev, nfp_flow,
 512                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 513         if (err)
 514                 goto err_free_flow;
 515
 516 err_free_flow:
 517         hash_del_rcu(&nfp_flow->link);
 518         port->tc_offload_cnt--;
 519         kfree(nfp_flow->action_data);
 520         kfree(nfp_flow->mask_data);
 521         kfree(nfp_flow->unmasked_data);
 522         kfree_rcu(nfp_flow, rcu);
 523         return err;
 524 }
 525
 526 /**
 527  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 528  * @app:        Pointer to the APP handle
 529  * @netdev:     Netdev structure.
 530  * @flow:       TC flower classifier offload structure
 531  * @egress:     Netdev is the egress dev.
 532  *
 533  * Populates a flow statistics structure which which corresponds to a
 534  * specific flow.
 535  *
 536  * Return: negative value on error, 0 if stats populated successfully.
 537  */
 538 static int
 539 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 540                      struct tc_cls_flower_offload *flow, bool egress)
 541 {
 542         struct nfp_fl_payload *nfp_flow;
 543         struct net_device *ingr_dev;
 544
 545         ingr_dev = egress ? NULL : netdev;
 546         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
 547                                               NFP_FL_STATS_CTX_DONT_CARE);
 548         if (!nfp_flow)
 549                 return -EINVAL;
 550
 551         if (nfp_flow->ingress_offload && egress)
 552                 return 0;
 553
 554         spin_lock_bh(&nfp_flow->lock);
 555         tcf_exts_stats_update(flow->exts, nfp_flow->stats.bytes,
 556                               nfp_flow->stats.pkts, nfp_flow->stats.used);
 557
 558         nfp_flow->stats.pkts = 0;
 559         nfp_flow->stats.bytes = 0;
 560         spin_unlock_bh(&nfp_flow->lock);
 561
 562         return 0;
 563 }
 564
 565 static int
 566 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 567                         struct tc_cls_flower_offload *flower, bool egress)
 568 {
 569         if (!eth_proto_is_802_3(flower->common.protocol))
 570                 return -EOPNOTSUPP;
 571
 572         switch (flower->command) {
 573         case TC_CLSFLOWER_REPLACE:
 574                 return nfp_flower_add_offload(app, netdev, flower, egress);
 575         case TC_CLSFLOWER_DESTROY:
 576                 return nfp_flower_del_offload(app, netdev, flower, egress);
 577         case TC_CLSFLOWER_STATS:
 578                 return nfp_flower_get_stats(app, netdev, flower, egress);
 579         }
 580
 581         return -EOPNOTSUPP;
 582 }
 583
 584 int nfp_flower_setup_tc_egress_cb(enum tc_setup_type type, void *type_data,
 585                                   void *cb_priv)
 586 {
 587         struct nfp_repr *repr = cb_priv;
 588
 589         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 590                 return -EOPNOTSUPP;
 591
 592         switch (type) {
 593         case TC_SETUP_CLSFLOWER:
 594                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 595                                                type_data, true);
 596         default:
 597                 return -EOPNOTSUPP;
 598         }
 599 }
 600
 601 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 602                                         void *type_data, void *cb_priv)
 603 {
 604         struct nfp_repr *repr = cb_priv;
 605
 606         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 607                 return -EOPNOTSUPP;
 608
 609         switch (type) {
 610         case TC_SETUP_CLSFLOWER:
 611                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 612                                                type_data, false);
 613         default:
 614                 return -EOPNOTSUPP;
 615         }
 616 }
 617
 618 static int nfp_flower_setup_tc_block(struct net_device *netdev,
 619                                      struct tc_block_offload *f)
 620 {
 621         struct nfp_repr *repr = netdev_priv(netdev);
 622
 623         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 624                 return -EOPNOTSUPP;
 625
 626         switch (f->command) {
 627         case TC_BLOCK_BIND:
 628                 return tcf_block_cb_register(f->block,
 629                                              nfp_flower_setup_tc_block_cb,
 630                                              repr, repr);
 631         case TC_BLOCK_UNBIND:
 632                 tcf_block_cb_unregister(f->block,
 633                                         nfp_flower_setup_tc_block_cb,
 634                                         repr);
 635                 return 0;
 636         default:
 637                 return -EOPNOTSUPP;
 638         }
 639 }
 640
 641 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 642                         enum tc_setup_type type, void *type_data)
 643 {
 644         switch (type) {
 645         case TC_SETUP_BLOCK:
 646                 return nfp_flower_setup_tc_block(netdev, type_data);
 647         default:
 648                 return -EOPNOTSUPP;
 649         }
 650 }