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         struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
 106
 107         return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 108                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 109                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
 110                flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 111 }
 112
 113 static int
 114 nfp_flower_calc_opt_layer(struct flow_match_enc_opts *enc_opts,
 115                           u32 *key_layer_two, int *key_size)
 116 {
 117         if (enc_opts->key->len > NFP_FL_MAX_GENEVE_OPT_KEY)
 118                 return -EOPNOTSUPP;
 119
 120         if (enc_opts->key->len > 0) {
 121                 *key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 122                 *key_size += sizeof(struct nfp_flower_geneve_options);
 123         }
 124
 125         return 0;
 126 }
 127
 128 static int
 129 nfp_flower_calculate_key_layers(struct nfp_app *app,
 130                                 struct net_device *netdev,
 131                                 struct nfp_fl_key_ls *ret_key_ls,
 132                                 struct tc_cls_flower_offload *flow,
 133                                 enum nfp_flower_tun_type *tun_type)
 134 {
 135         struct flow_rule *rule = tc_cls_flower_offload_flow_rule(flow);
 136         struct flow_dissector *dissector = rule->match.dissector;
 137         struct flow_match_basic basic = { NULL, 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 (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 (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 149             (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 (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
 159             flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
 160                 key_layer |= NFP_FLOWER_LAYER_MAC;
 161                 key_size += sizeof(struct nfp_flower_mac_mpls);
 162         }
 163
 164         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
 165                 struct flow_match_vlan vlan;
 166
 167                 flow_rule_match_vlan(rule, &vlan);
 168                 if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
 169                     vlan.key->vlan_priority)
 170                         return -EOPNOTSUPP;
 171         }
 172
 173         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 174                 struct flow_match_enc_opts enc_op = { NULL, NULL };
 175                 struct flow_match_ipv4_addrs ipv4_addrs;
 176                 struct flow_match_control enc_ctl;
 177                 struct flow_match_ports enc_ports;
 178
 179                 flow_rule_match_enc_control(rule, &enc_ctl);
 180
 181                 if (enc_ctl.mask->addr_type != 0xffff ||
 182                     enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
 183                         return -EOPNOTSUPP;
 184
 185                 /* These fields are already verified as used. */
 186                 flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
 187                 if (ipv4_addrs.mask->dst != cpu_to_be32(~0))
 188                         return -EOPNOTSUPP;
 189
 190                 flow_rule_match_enc_ports(rule, &enc_ports);
 191                 if (enc_ports.mask->dst != cpu_to_be16(~0))
 192                         return -EOPNOTSUPP;
 193
 194                 if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
 195                         flow_rule_match_enc_opts(rule, &enc_op);
 196
 197                 switch (enc_ports.key->dst) {
 198                 case htons(NFP_FL_VXLAN_PORT):
 199                         *tun_type = NFP_FL_TUNNEL_VXLAN;
 200                         key_layer |= NFP_FLOWER_LAYER_VXLAN;
 201                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 202
 203                         if (enc_op.key)
 204                                 return -EOPNOTSUPP;
 205                         break;
 206                 case htons(NFP_FL_GENEVE_PORT):
 207                         if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE))
 208                                 return -EOPNOTSUPP;
 209                         *tun_type = NFP_FL_TUNNEL_GENEVE;
 210                         key_layer |= NFP_FLOWER_LAYER_EXT_META;
 211                         key_size += sizeof(struct nfp_flower_ext_meta);
 212                         key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 213                         key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 214
 215                         if (!enc_op.key)
 216                                 break;
 217                         if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT))
 218                                 return -EOPNOTSUPP;
 219                         err = nfp_flower_calc_opt_layer(&enc_op, &key_layer_two,
 220                                                         &key_size);
 221                         if (err)
 222                                 return err;
 223                         break;
 224                 default:
 225                         return -EOPNOTSUPP;
 226                 }
 227
 228                 /* Ensure the ingress netdev matches the expected tun type. */
 229                 if (!nfp_fl_netdev_is_tunnel_type(netdev, *tun_type))
 230                         return -EOPNOTSUPP;
 231         }
 232
 233         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
 234                 flow_rule_match_basic(rule, &basic);
 235
 236         if (basic.mask && basic.mask->n_proto) {
 237                 /* Ethernet type is present in the key. */
 238                 switch (basic.key->n_proto) {
 239                 case cpu_to_be16(ETH_P_IP):
 240                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 241                         key_size += sizeof(struct nfp_flower_ipv4);
 242                         break;
 243
 244                 case cpu_to_be16(ETH_P_IPV6):
 245                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 246                         key_size += sizeof(struct nfp_flower_ipv6);
 247                         break;
 248
 249                 /* Currently we do not offload ARP
 250                  * because we rely on it to get to the host.
 251                  */
 252                 case cpu_to_be16(ETH_P_ARP):
 253                         return -EOPNOTSUPP;
 254
 255                 case cpu_to_be16(ETH_P_MPLS_UC):
 256                 case cpu_to_be16(ETH_P_MPLS_MC):
 257                         if (!(key_layer & NFP_FLOWER_LAYER_MAC)) {
 258                                 key_layer |= NFP_FLOWER_LAYER_MAC;
 259                                 key_size += sizeof(struct nfp_flower_mac_mpls);
 260                         }
 261                         break;
 262
 263                 /* Will be included in layer 2. */
 264                 case cpu_to_be16(ETH_P_8021Q):
 265                         break;
 266
 267                 default:
 268                         /* Other ethtype - we need check the masks for the
 269                          * remainder of the key to ensure we can offload.
 270                          */
 271                         if (nfp_flower_check_higher_than_mac(flow))
 272                                 return -EOPNOTSUPP;
 273                         break;
 274                 }
 275         }
 276
 277         if (basic.mask && basic.mask->ip_proto) {
 278                 /* Ethernet type is present in the key. */
 279                 switch (basic.key->ip_proto) {
 280                 case IPPROTO_TCP:
 281                 case IPPROTO_UDP:
 282                 case IPPROTO_SCTP:
 283                 case IPPROTO_ICMP:
 284                 case IPPROTO_ICMPV6:
 285                         key_layer |= NFP_FLOWER_LAYER_TP;
 286                         key_size += sizeof(struct nfp_flower_tp_ports);
 287                         break;
 288                 default:
 289                         /* Other ip proto - we need check the masks for the
 290                          * remainder of the key to ensure we can offload.
 291                          */
 292                         return -EOPNOTSUPP;
 293                 }
 294         }
 295
 296         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
 297                 struct flow_match_tcp tcp;
 298                 u32 tcp_flags;
 299
 300                 flow_rule_match_tcp(rule, &tcp);
 301                 tcp_flags = be16_to_cpu(tcp.key->flags);
 302
 303                 if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS)
 304                         return -EOPNOTSUPP;
 305
 306                 /* We only support PSH and URG flags when either
 307                  * FIN, SYN or RST is present as well.
 308                  */
 309                 if ((tcp_flags & (TCPHDR_PSH | TCPHDR_URG)) &&
 310                     !(tcp_flags & (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST)))
 311                         return -EOPNOTSUPP;
 312
 313                 /* We need to store TCP flags in the either the IPv4 or IPv6 key
 314                  * space, thus we need to ensure we include a IPv4/IPv6 key
 315                  * layer if we have not done so already.
 316                  */
 317                 if (!basic.key)
 318                         return -EOPNOTSUPP;
 319
 320                 if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 321                     !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
 322                         switch (basic.key->n_proto) {
 323                         case cpu_to_be16(ETH_P_IP):
 324                                 key_layer |= NFP_FLOWER_LAYER_IPV4;
 325                                 key_size += sizeof(struct nfp_flower_ipv4);
 326                                 break;
 327
 328                         case cpu_to_be16(ETH_P_IPV6):
 329                                 key_layer |= NFP_FLOWER_LAYER_IPV6;
 330                                 key_size += sizeof(struct nfp_flower_ipv6);
 331                                 break;
 332
 333                         default:
 334                                 return -EOPNOTSUPP;
 335                         }
 336                 }
 337         }
 338
 339         if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
 340                 struct flow_match_control ctl;
 341
 342                 flow_rule_match_control(rule, &ctl);
 343                 if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 344                         return -EOPNOTSUPP;
 345         }
 346
 347         ret_key_ls->key_layer = key_layer;
 348         ret_key_ls->key_layer_two = key_layer_two;
 349         ret_key_ls->key_size = key_size;
 350
 351         return 0;
 352 }
 353
 354 static struct nfp_fl_payload *
 355 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 356 {
 357         struct nfp_fl_payload *flow_pay;
 358
 359         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 360         if (!flow_pay)
 361                 return NULL;
 362
 363         flow_pay->meta.key_len = key_layer->key_size;
 364         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 365         if (!flow_pay->unmasked_data)
 366                 goto err_free_flow;
 367
 368         flow_pay->meta.mask_len = key_layer->key_size;
 369         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 370         if (!flow_pay->mask_data)
 371                 goto err_free_unmasked;
 372
 373         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 374         if (!flow_pay->action_data)
 375                 goto err_free_mask;
 376
 377         flow_pay->nfp_tun_ipv4_addr = 0;
 378         flow_pay->meta.flags = 0;
 379
 380         return flow_pay;
 381
 382 err_free_mask:
 383         kfree(flow_pay->mask_data);
 384 err_free_unmasked:
 385         kfree(flow_pay->unmasked_data);
 386 err_free_flow:
 387         kfree(flow_pay);
 388         return NULL;
 389 }
 390
 391 /**
 392  * nfp_flower_add_offload() - Adds a new flow to hardware.
 393  * @app:        Pointer to the APP handle
 394  * @netdev:     netdev structure.
 395  * @flow:       TC flower classifier offload structure.
 396  *
 397  * Adds a new flow to the repeated hash structure and action payload.
 398  *
 399  * Return: negative value on error, 0 if configured successfully.
 400  */
 401 static int
 402 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 403                        struct tc_cls_flower_offload *flow)
 404 {
 405         enum nfp_flower_tun_type tun_type = NFP_FL_TUNNEL_NONE;
 406         struct nfp_flower_priv *priv = app->priv;
 407         struct nfp_fl_payload *flow_pay;
 408         struct nfp_fl_key_ls *key_layer;
 409         struct nfp_port *port = NULL;
 410         int err;
 411
 412         if (nfp_netdev_is_nfp_repr(netdev))
 413                 port = nfp_port_from_netdev(netdev);
 414
 415         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 416         if (!key_layer)
 417                 return -ENOMEM;
 418
 419         err = nfp_flower_calculate_key_layers(app, netdev, key_layer, flow,
 420                                               &tun_type);
 421         if (err)
 422                 goto err_free_key_ls;
 423
 424         flow_pay = nfp_flower_allocate_new(key_layer);
 425         if (!flow_pay) {
 426                 err = -ENOMEM;
 427                 goto err_free_key_ls;
 428         }
 429
 430         err = nfp_flower_compile_flow_match(app, flow, key_layer, netdev,
 431                                             flow_pay, tun_type);
 432         if (err)
 433                 goto err_destroy_flow;
 434
 435         err = nfp_flower_compile_action(app, flow, netdev, flow_pay);
 436         if (err)
 437                 goto err_destroy_flow;
 438
 439         err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev);
 440         if (err)
 441                 goto err_destroy_flow;
 442
 443         flow_pay->tc_flower_cookie = flow->cookie;
 444         err = rhashtable_insert_fast(&priv->flow_table, &flow_pay->fl_node,
 445                                      nfp_flower_table_params);
 446         if (err)
 447                 goto err_release_metadata;
 448
 449         err = nfp_flower_xmit_flow(app, flow_pay,
 450                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 451         if (err)
 452                 goto err_remove_rhash;
 453
 454         if (port)
 455                 port->tc_offload_cnt++;
 456
 457         /* Deallocate flow payload when flower rule has been destroyed. */
 458         kfree(key_layer);
 459
 460         return 0;
 461
 462 err_remove_rhash:
 463         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 464                                             &flow_pay->fl_node,
 465                                             nfp_flower_table_params));
 466 err_release_metadata:
 467         nfp_modify_flow_metadata(app, flow_pay);
 468 err_destroy_flow:
 469         kfree(flow_pay->action_data);
 470         kfree(flow_pay->mask_data);
 471         kfree(flow_pay->unmasked_data);
 472         kfree(flow_pay);
 473 err_free_key_ls:
 474         kfree(key_layer);
 475         return err;
 476 }
 477
 478 /**
 479  * nfp_flower_del_offload() - Removes a flow from hardware.
 480  * @app:        Pointer to the APP handle
 481  * @netdev:     netdev structure.
 482  * @flow:       TC flower classifier offload structure
 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)
 492 {
 493         struct nfp_flower_priv *priv = app->priv;
 494         struct nfp_fl_payload *nfp_flow;
 495         struct nfp_port *port = NULL;
 496         int err;
 497
 498         if (nfp_netdev_is_nfp_repr(netdev))
 499                 port = nfp_port_from_netdev(netdev);
 500
 501         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 502         if (!nfp_flow)
 503                 return -ENOENT;
 504
 505         err = nfp_modify_flow_metadata(app, nfp_flow);
 506         if (err)
 507                 goto err_free_flow;
 508
 509         if (nfp_flow->nfp_tun_ipv4_addr)
 510                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 511
 512         err = nfp_flower_xmit_flow(app, nfp_flow,
 513                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 514         if (err)
 515                 goto err_free_flow;
 516
 517 err_free_flow:
 518         if (port)
 519                 port->tc_offload_cnt--;
 520         kfree(nfp_flow->action_data);
 521         kfree(nfp_flow->mask_data);
 522         kfree(nfp_flow->unmasked_data);
 523         WARN_ON_ONCE(rhashtable_remove_fast(&priv->flow_table,
 524                                             &nfp_flow->fl_node,
 525                                             nfp_flower_table_params));
 526         kfree_rcu(nfp_flow, rcu);
 527         return err;
 528 }
 529
 530 /**
 531  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 532  * @app:        Pointer to the APP handle
 533  * @netdev:     Netdev structure.
 534  * @flow:       TC flower classifier offload structure
 535  *
 536  * Populates a flow statistics structure which which corresponds to a
 537  * specific flow.
 538  *
 539  * Return: negative value on error, 0 if stats populated successfully.
 540  */
 541 static int
 542 nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 543                      struct tc_cls_flower_offload *flow)
 544 {
 545         struct nfp_flower_priv *priv = app->priv;
 546         struct nfp_fl_payload *nfp_flow;
 547         u32 ctx_id;
 548
 549         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 550         if (!nfp_flow)
 551                 return -EINVAL;
 552
 553         ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
 554
 555         spin_lock_bh(&priv->stats_lock);
 556         flow_stats_update(&flow->stats, priv->stats[ctx_id].bytes,
 557                           priv->stats[ctx_id].pkts, priv->stats[ctx_id].used);
 558
 559         priv->stats[ctx_id].pkts = 0;
 560         priv->stats[ctx_id].bytes = 0;
 561         spin_unlock_bh(&priv->stats_lock);
 562
 563         return 0;
 564 }
 565
 566 static int
 567 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 568                         struct tc_cls_flower_offload *flower)
 569 {
 570         if (!eth_proto_is_802_3(flower->common.protocol))
 571                 return -EOPNOTSUPP;
 572
 573         switch (flower->command) {
 574         case TC_CLSFLOWER_REPLACE:
 575                 return nfp_flower_add_offload(app, netdev, flower);
 576         case TC_CLSFLOWER_DESTROY:
 577                 return nfp_flower_del_offload(app, netdev, flower);
 578         case TC_CLSFLOWER_STATS:
 579                 return nfp_flower_get_stats(app, netdev, flower);
 580         default:
 581                 return -EOPNOTSUPP;
 582         }
 583 }
 584
 585 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 586                                         void *type_data, void *cb_priv)
 587 {
 588         struct nfp_repr *repr = cb_priv;
 589
 590         if (!tc_cls_can_offload_and_chain0(repr->netdev, type_data))
 591                 return -EOPNOTSUPP;
 592
 593         switch (type) {
 594         case TC_SETUP_CLSFLOWER:
 595                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 596                                                type_data);
 597         default:
 598                 return -EOPNOTSUPP;
 599         }
 600 }
 601
 602 static int nfp_flower_setup_tc_block(struct net_device *netdev,
 603                                      struct tc_block_offload *f)
 604 {
 605         struct nfp_repr *repr = netdev_priv(netdev);
 606
 607         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 608                 return -EOPNOTSUPP;
 609
 610         switch (f->command) {
 611         case TC_BLOCK_BIND:
 612                 return tcf_block_cb_register(f->block,
 613                                              nfp_flower_setup_tc_block_cb,
 614                                              repr, repr, f->extack);
 615         case TC_BLOCK_UNBIND:
 616                 tcf_block_cb_unregister(f->block,
 617                                         nfp_flower_setup_tc_block_cb,
 618                                         repr);
 619                 return 0;
 620         default:
 621                 return -EOPNOTSUPP;
 622         }
 623 }
 624
 625 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 626                         enum tc_setup_type type, void *type_data)
 627 {
 628         switch (type) {
 629         case TC_SETUP_BLOCK:
 630                 return nfp_flower_setup_tc_block(netdev, type_data);
 631         default:
 632                 return -EOPNOTSUPP;
 633         }
 634 }
 635
 636 struct nfp_flower_indr_block_cb_priv {
 637         struct net_device *netdev;
 638         struct nfp_app *app;
 639         struct list_head list;
 640 };
 641
 642 static struct nfp_flower_indr_block_cb_priv *
 643 nfp_flower_indr_block_cb_priv_lookup(struct nfp_app *app,
 644                                      struct net_device *netdev)
 645 {
 646         struct nfp_flower_indr_block_cb_priv *cb_priv;
 647         struct nfp_flower_priv *priv = app->priv;
 648
 649         /* All callback list access should be protected by RTNL. */
 650         ASSERT_RTNL();
 651
 652         list_for_each_entry(cb_priv, &priv->indr_block_cb_priv, list)
 653                 if (cb_priv->netdev == netdev)
 654                         return cb_priv;
 655
 656         return NULL;
 657 }
 658
 659 static int nfp_flower_setup_indr_block_cb(enum tc_setup_type type,
 660                                           void *type_data, void *cb_priv)
 661 {
 662         struct nfp_flower_indr_block_cb_priv *priv = cb_priv;
 663         struct tc_cls_flower_offload *flower = type_data;
 664
 665         if (flower->common.chain_index)
 666                 return -EOPNOTSUPP;
 667
 668         switch (type) {
 669         case TC_SETUP_CLSFLOWER:
 670                 return nfp_flower_repr_offload(priv->app, priv->netdev,
 671                                                type_data);
 672         default:
 673                 return -EOPNOTSUPP;
 674         }
 675 }
 676
 677 static int
 678 nfp_flower_setup_indr_tc_block(struct net_device *netdev, struct nfp_app *app,
 679                                struct tc_block_offload *f)
 680 {
 681         struct nfp_flower_indr_block_cb_priv *cb_priv;
 682         struct nfp_flower_priv *priv = app->priv;
 683         int err;
 684
 685         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 686                 return -EOPNOTSUPP;
 687
 688         switch (f->command) {
 689         case TC_BLOCK_BIND:
 690                 cb_priv = kmalloc(sizeof(*cb_priv), GFP_KERNEL);
 691                 if (!cb_priv)
 692                         return -ENOMEM;
 693
 694                 cb_priv->netdev = netdev;
 695                 cb_priv->app = app;
 696                 list_add(&cb_priv->list, &priv->indr_block_cb_priv);
 697
 698                 err = tcf_block_cb_register(f->block,
 699                                             nfp_flower_setup_indr_block_cb,
 700                                             cb_priv, cb_priv, f->extack);
 701                 if (err) {
 702                         list_del(&cb_priv->list);
 703                         kfree(cb_priv);
 704                 }
 705
 706                 return err;
 707         case TC_BLOCK_UNBIND:
 708                 cb_priv = nfp_flower_indr_block_cb_priv_lookup(app, netdev);
 709                 if (!cb_priv)
 710                         return -ENOENT;
 711
 712                 tcf_block_cb_unregister(f->block,
 713                                         nfp_flower_setup_indr_block_cb,
 714                                         cb_priv);
 715                 list_del(&cb_priv->list);
 716                 kfree(cb_priv);
 717
 718                 return 0;
 719         default:
 720                 return -EOPNOTSUPP;
 721         }
 722         return 0;
 723 }
 724
 725 static int
 726 nfp_flower_indr_setup_tc_cb(struct net_device *netdev, void *cb_priv,
 727                             enum tc_setup_type type, void *type_data)
 728 {
 729         switch (type) {
 730         case TC_SETUP_BLOCK:
 731                 return nfp_flower_setup_indr_tc_block(netdev, cb_priv,
 732                                                       type_data);
 733         default:
 734                 return -EOPNOTSUPP;
 735         }
 736 }
 737
 738 int nfp_flower_reg_indir_block_handler(struct nfp_app *app,
 739                                        struct net_device *netdev,
 740                                        unsigned long event)
 741 {
 742         int err;
 743
 744         if (!nfp_fl_is_netdev_to_offload(netdev))
 745                 return NOTIFY_OK;
 746
 747         if (event == NETDEV_REGISTER) {
 748                 err = __tc_indr_block_cb_register(netdev, app,
 749                                                   nfp_flower_indr_setup_tc_cb,
 750                                                   app);
 751                 if (err)
 752                         nfp_flower_cmsg_warn(app,
 753                                              "Indirect block reg failed - %s\n",
 754                                              netdev->name);
 755         } else if (event == NETDEV_UNREGISTER) {
 756                 __tc_indr_block_cb_unregister(netdev,
 757                                               nfp_flower_indr_setup_tc_cb, app);
 758         }
 759
 760         return NOTIFY_OK;
 761 }