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_WHITELIST_DISSECTOR \
  48         (BIT(FLOW_DISSECTOR_KEY_CONTROL) | \
  49          BIT(FLOW_DISSECTOR_KEY_BASIC) | \
  50          BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) | \
  51          BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) | \
  52          BIT(FLOW_DISSECTOR_KEY_PORTS) | \
  53          BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) | \
  54          BIT(FLOW_DISSECTOR_KEY_VLAN) | \
  55          BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  56          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  57          BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  58          BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  59          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS) | \
  60          BIT(FLOW_DISSECTOR_KEY_MPLS) | \
  61          BIT(FLOW_DISSECTOR_KEY_IP))
  62
  63 #define NFP_FLOWER_WHITELIST_TUN_DISSECTOR \
  64         (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  65          BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) | \
  66          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  67          BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) | \
  68          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  69
  70 #define NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R \
  71         (BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL) | \
  72          BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) | \
  73          BIT(FLOW_DISSECTOR_KEY_ENC_PORTS))
  74
  75 static int
  76 nfp_flower_xmit_flow(struct net_device *netdev,
  77                      struct nfp_fl_payload *nfp_flow, u8 mtype)
  78 {
  79         u32 meta_len, key_len, mask_len, act_len, tot_len;
  80         struct nfp_repr *priv = netdev_priv(netdev);
  81         struct sk_buff *skb;
  82         unsigned char *msg;
  83
  84         meta_len =  sizeof(struct nfp_fl_rule_metadata);
  85         key_len = nfp_flow->meta.key_len;
  86         mask_len = nfp_flow->meta.mask_len;
  87         act_len = nfp_flow->meta.act_len;
  88
  89         tot_len = meta_len + key_len + mask_len + act_len;
  90
  91         /* Convert to long words as firmware expects
  92          * lengths in units of NFP_FL_LW_SIZ.
  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         skb = nfp_flower_cmsg_alloc(priv->app, tot_len, mtype, GFP_KERNEL);
  99         if (!skb)
 100                 return -ENOMEM;
 101
 102         msg = nfp_flower_cmsg_get_data(skb);
 103         memcpy(msg, &nfp_flow->meta, meta_len);
 104         memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len);
 105         memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len);
 106         memcpy(&msg[meta_len + key_len + mask_len],
 107                nfp_flow->action_data, act_len);
 108
 109         /* Convert back to bytes as software expects
 110          * lengths in units of bytes.
 111          */
 112         nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ;
 113         nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ;
 114         nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ;
 115
 116         nfp_ctrl_tx(priv->app->ctrl, skb);
 117
 118         return 0;
 119 }
 120
 121 static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
 122 {
 123         return dissector_uses_key(f->dissector,
 124                                   FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
 125                 dissector_uses_key(f->dissector,
 126                                    FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
 127                 dissector_uses_key(f->dissector,
 128                                    FLOW_DISSECTOR_KEY_PORTS) ||
 129                 dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP);
 130 }
 131
 132 static int
 133 nfp_flower_calculate_key_layers(struct nfp_fl_key_ls *ret_key_ls,
 134                                 struct tc_cls_flower_offload *flow,
 135                                 bool egress)
 136 {
 137         struct flow_dissector_key_basic *mask_basic = NULL;
 138         struct flow_dissector_key_basic *key_basic = NULL;
 139         u32 key_layer_two;
 140         u8 key_layer;
 141         int key_size;
 142
 143         if (flow->dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR)
 144                 return -EOPNOTSUPP;
 145
 146         /* If any tun dissector is used then the required set must be used. */
 147         if (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
 148             (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 149             != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 150                 return -EOPNOTSUPP;
 151
 152         key_layer_two = 0;
 153         key_layer = NFP_FLOWER_LAYER_PORT | NFP_FLOWER_LAYER_MAC;
 154         key_size = sizeof(struct nfp_flower_meta_one) +
 155                    sizeof(struct nfp_flower_in_port) +
 156                    sizeof(struct nfp_flower_mac_mpls);
 157
 158         if (dissector_uses_key(flow->dissector,
 159                                FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
 160                 struct flow_dissector_key_ipv4_addrs *mask_ipv4 = NULL;
 161                 struct flow_dissector_key_ports *mask_enc_ports = NULL;
 162                 struct flow_dissector_key_ports *enc_ports = NULL;
 163                 struct flow_dissector_key_control *mask_enc_ctl =
 164                         skb_flow_dissector_target(flow->dissector,
 165                                                   FLOW_DISSECTOR_KEY_ENC_CONTROL,
 166                                                   flow->mask);
 167                 struct flow_dissector_key_control *enc_ctl =
 168                         skb_flow_dissector_target(flow->dissector,
 169                                                   FLOW_DISSECTOR_KEY_ENC_CONTROL,
 170                                                   flow->key);
 171                 if (!egress)
 172                         return -EOPNOTSUPP;
 173
 174                 if (mask_enc_ctl->addr_type != 0xffff ||
 175                     enc_ctl->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
 176                         return -EOPNOTSUPP;
 177
 178                 /* These fields are already verified as used. */
 179                 mask_ipv4 =
 180                         skb_flow_dissector_target(flow->dissector,
 181                                                   FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
 182                                                   flow->mask);
 183                 if (mask_ipv4->dst != cpu_to_be32(~0))
 184                         return -EOPNOTSUPP;
 185
 186                 mask_enc_ports =
 187                         skb_flow_dissector_target(flow->dissector,
 188                                                   FLOW_DISSECTOR_KEY_ENC_PORTS,
 189                                                   flow->mask);
 190                 enc_ports =
 191                         skb_flow_dissector_target(flow->dissector,
 192                                                   FLOW_DISSECTOR_KEY_ENC_PORTS,
 193                                                   flow->key);
 194
 195                 if (mask_enc_ports->dst != cpu_to_be16(~0) ||
 196                     enc_ports->dst != htons(NFP_FL_VXLAN_PORT))
 197                         return -EOPNOTSUPP;
 198
 199                 key_layer |= NFP_FLOWER_LAYER_VXLAN;
 200                 key_size += sizeof(struct nfp_flower_vxlan);
 201         } else if (egress) {
 202                 /* Reject non tunnel matches offloaded to egress repr. */
 203                 return -EOPNOTSUPP;
 204         }
 205
 206         if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
 207                 mask_basic = skb_flow_dissector_target(flow->dissector,
 208                                                        FLOW_DISSECTOR_KEY_BASIC,
 209                                                        flow->mask);
 210
 211                 key_basic = skb_flow_dissector_target(flow->dissector,
 212                                                       FLOW_DISSECTOR_KEY_BASIC,
 213                                                       flow->key);
 214         }
 215
 216         if (mask_basic && mask_basic->n_proto) {
 217                 /* Ethernet type is present in the key. */
 218                 switch (key_basic->n_proto) {
 219                 case cpu_to_be16(ETH_P_IP):
 220                         key_layer |= NFP_FLOWER_LAYER_IPV4;
 221                         key_size += sizeof(struct nfp_flower_ipv4);
 222                         break;
 223
 224                 case cpu_to_be16(ETH_P_IPV6):
 225                         key_layer |= NFP_FLOWER_LAYER_IPV6;
 226                         key_size += sizeof(struct nfp_flower_ipv6);
 227                         break;
 228
 229                 /* Currently we do not offload ARP
 230                  * because we rely on it to get to the host.
 231                  */
 232                 case cpu_to_be16(ETH_P_ARP):
 233                         return -EOPNOTSUPP;
 234
 235                 /* Will be included in layer 2. */
 236                 case cpu_to_be16(ETH_P_8021Q):
 237                         break;
 238
 239                 default:
 240                         /* Other ethtype - we need check the masks for the
 241                          * remainder of the key to ensure we can offload.
 242                          */
 243                         if (nfp_flower_check_higher_than_mac(flow))
 244                                 return -EOPNOTSUPP;
 245                         break;
 246                 }
 247         }
 248
 249         if (mask_basic && mask_basic->ip_proto) {
 250                 /* Ethernet type is present in the key. */
 251                 switch (key_basic->ip_proto) {
 252                 case IPPROTO_TCP:
 253                 case IPPROTO_UDP:
 254                 case IPPROTO_SCTP:
 255                 case IPPROTO_ICMP:
 256                 case IPPROTO_ICMPV6:
 257                         key_layer |= NFP_FLOWER_LAYER_TP;
 258                         key_size += sizeof(struct nfp_flower_tp_ports);
 259                         break;
 260                 default:
 261                         /* Other ip proto - we need check the masks for the
 262                          * remainder of the key to ensure we can offload.
 263                          */
 264                         return -EOPNOTSUPP;
 265                 }
 266         }
 267
 268         ret_key_ls->key_layer = key_layer;
 269         ret_key_ls->key_layer_two = key_layer_two;
 270         ret_key_ls->key_size = key_size;
 271
 272         return 0;
 273 }
 274
 275 static struct nfp_fl_payload *
 276 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 277 {
 278         struct nfp_fl_payload *flow_pay;
 279
 280         flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL);
 281         if (!flow_pay)
 282                 return NULL;
 283
 284         flow_pay->meta.key_len = key_layer->key_size;
 285         flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 286         if (!flow_pay->unmasked_data)
 287                 goto err_free_flow;
 288
 289         flow_pay->meta.mask_len = key_layer->key_size;
 290         flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL);
 291         if (!flow_pay->mask_data)
 292                 goto err_free_unmasked;
 293
 294         flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL);
 295         if (!flow_pay->action_data)
 296                 goto err_free_mask;
 297
 298         flow_pay->nfp_tun_ipv4_addr = 0;
 299         flow_pay->meta.flags = 0;
 300         spin_lock_init(&flow_pay->lock);
 301
 302         return flow_pay;
 303
 304 err_free_mask:
 305         kfree(flow_pay->mask_data);
 306 err_free_unmasked:
 307         kfree(flow_pay->unmasked_data);
 308 err_free_flow:
 309         kfree(flow_pay);
 310         return NULL;
 311 }
 312
 313 /**
 314  * nfp_flower_add_offload() - Adds a new flow to hardware.
 315  * @app:        Pointer to the APP handle
 316  * @netdev:     netdev structure.
 317  * @flow:       TC flower classifier offload structure.
 318  * @egress:     NFP netdev is the egress.
 319  *
 320  * Adds a new flow to the repeated hash structure and action payload.
 321  *
 322  * Return: negative value on error, 0 if configured successfully.
 323  */
 324 static int
 325 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 326                        struct tc_cls_flower_offload *flow, bool egress)
 327 {
 328         struct nfp_flower_priv *priv = app->priv;
 329         struct nfp_fl_payload *flow_pay;
 330         struct nfp_fl_key_ls *key_layer;
 331         int err;
 332
 333         key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL);
 334         if (!key_layer)
 335                 return -ENOMEM;
 336
 337         err = nfp_flower_calculate_key_layers(key_layer, flow, egress);
 338         if (err)
 339                 goto err_free_key_ls;
 340
 341         flow_pay = nfp_flower_allocate_new(key_layer);
 342         if (!flow_pay) {
 343                 err = -ENOMEM;
 344                 goto err_free_key_ls;
 345         }
 346
 347         err = nfp_flower_compile_flow_match(flow, key_layer, netdev, flow_pay);
 348         if (err)
 349                 goto err_destroy_flow;
 350
 351         err = nfp_flower_compile_action(flow, netdev, flow_pay);
 352         if (err)
 353                 goto err_destroy_flow;
 354
 355         err = nfp_compile_flow_metadata(app, flow, flow_pay);
 356         if (err)
 357                 goto err_destroy_flow;
 358
 359         err = nfp_flower_xmit_flow(netdev, flow_pay,
 360                                    NFP_FLOWER_CMSG_TYPE_FLOW_ADD);
 361         if (err)
 362                 goto err_destroy_flow;
 363
 364         INIT_HLIST_NODE(&flow_pay->link);
 365         flow_pay->tc_flower_cookie = flow->cookie;
 366         hash_add_rcu(priv->flow_table, &flow_pay->link, flow->cookie);
 367
 368         /* Deallocate flow payload when flower rule has been destroyed. */
 369         kfree(key_layer);
 370
 371         return 0;
 372
 373 err_destroy_flow:
 374         kfree(flow_pay->action_data);
 375         kfree(flow_pay->mask_data);
 376         kfree(flow_pay->unmasked_data);
 377         kfree(flow_pay);
 378 err_free_key_ls:
 379         kfree(key_layer);
 380         return err;
 381 }
 382
 383 /**
 384  * nfp_flower_del_offload() - Removes a flow from hardware.
 385  * @app:        Pointer to the APP handle
 386  * @netdev:     netdev structure.
 387  * @flow:       TC flower classifier offload structure
 388  *
 389  * Removes a flow from the repeated hash structure and clears the
 390  * action payload.
 391  *
 392  * Return: negative value on error, 0 if removed successfully.
 393  */
 394 static int
 395 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 396                        struct tc_cls_flower_offload *flow)
 397 {
 398         struct nfp_fl_payload *nfp_flow;
 399         int err;
 400
 401         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie);
 402         if (!nfp_flow)
 403                 return -ENOENT;
 404
 405         err = nfp_modify_flow_metadata(app, nfp_flow);
 406         if (err)
 407                 goto err_free_flow;
 408
 409         if (nfp_flow->nfp_tun_ipv4_addr)
 410                 nfp_tunnel_del_ipv4_off(app, nfp_flow->nfp_tun_ipv4_addr);
 411
 412         err = nfp_flower_xmit_flow(netdev, nfp_flow,
 413                                    NFP_FLOWER_CMSG_TYPE_FLOW_DEL);
 414         if (err)
 415                 goto err_free_flow;
 416
 417 err_free_flow:
 418         hash_del_rcu(&nfp_flow->link);
 419         kfree(nfp_flow->action_data);
 420         kfree(nfp_flow->mask_data);
 421         kfree(nfp_flow->unmasked_data);
 422         kfree_rcu(nfp_flow, rcu);
 423         return err;
 424 }
 425
 426 /**
 427  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
 428  * @app:        Pointer to the APP handle
 429  * @flow:       TC flower classifier offload structure
 430  *
 431  * Populates a flow statistics structure which which corresponds to a
 432  * specific flow.
 433  *
 434  * Return: negative value on error, 0 if stats populated successfully.
 435  */
 436 static int
 437 nfp_flower_get_stats(struct nfp_app *app, struct tc_cls_flower_offload *flow)
 438 {
 439         struct nfp_fl_payload *nfp_flow;
 440
 441         nfp_flow = nfp_flower_search_fl_table(app, flow->cookie);
 442         if (!nfp_flow)
 443                 return -EINVAL;
 444
 445         spin_lock_bh(&nfp_flow->lock);
 446         tcf_exts_stats_update(flow->exts, nfp_flow->stats.bytes,
 447                               nfp_flow->stats.pkts, nfp_flow->stats.used);
 448
 449         nfp_flow->stats.pkts = 0;
 450         nfp_flow->stats.bytes = 0;
 451         spin_unlock_bh(&nfp_flow->lock);
 452
 453         return 0;
 454 }
 455
 456 static int
 457 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 458                         struct tc_cls_flower_offload *flower, bool egress)
 459 {
 460         if (!eth_proto_is_802_3(flower->common.protocol) ||
 461             flower->common.chain_index)
 462                 return -EOPNOTSUPP;
 463
 464         switch (flower->command) {
 465         case TC_CLSFLOWER_REPLACE:
 466                 return nfp_flower_add_offload(app, netdev, flower, egress);
 467         case TC_CLSFLOWER_DESTROY:
 468                 return nfp_flower_del_offload(app, netdev, flower);
 469         case TC_CLSFLOWER_STATS:
 470                 return nfp_flower_get_stats(app, flower);
 471         }
 472
 473         return -EOPNOTSUPP;
 474 }
 475
 476 int nfp_flower_setup_tc_egress_cb(enum tc_setup_type type, void *type_data,
 477                                   void *cb_priv)
 478 {
 479         struct nfp_repr *repr = cb_priv;
 480
 481         if (!tc_can_offload(repr->netdev))
 482                 return -EOPNOTSUPP;
 483
 484         switch (type) {
 485         case TC_SETUP_CLSFLOWER:
 486                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 487                                                type_data, true);
 488         default:
 489                 return -EOPNOTSUPP;
 490         }
 491 }
 492
 493 static int nfp_flower_setup_tc_block_cb(enum tc_setup_type type,
 494                                         void *type_data, void *cb_priv)
 495 {
 496         struct nfp_repr *repr = cb_priv;
 497
 498         if (!tc_can_offload(repr->netdev))
 499                 return -EOPNOTSUPP;
 500
 501         switch (type) {
 502         case TC_SETUP_CLSFLOWER:
 503                 return nfp_flower_repr_offload(repr->app, repr->netdev,
 504                                                type_data, false);
 505         default:
 506                 return -EOPNOTSUPP;
 507         }
 508 }
 509
 510 static int nfp_flower_setup_tc_block(struct net_device *netdev,
 511                                      struct tc_block_offload *f)
 512 {
 513         struct nfp_repr *repr = netdev_priv(netdev);
 514
 515         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 516                 return -EOPNOTSUPP;
 517
 518         switch (f->command) {
 519         case TC_BLOCK_BIND:
 520                 return tcf_block_cb_register(f->block,
 521                                              nfp_flower_setup_tc_block_cb,
 522                                              repr, repr);
 523         case TC_BLOCK_UNBIND:
 524                 tcf_block_cb_unregister(f->block,
 525                                         nfp_flower_setup_tc_block_cb,
 526                                         repr);
 527                 return 0;
 528         default:
 529                 return -EOPNOTSUPP;
 530         }
 531 }
 532
 533 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
 534                         enum tc_setup_type type, void *type_data)
 535 {
 536         switch (type) {
 537         case TC_SETUP_BLOCK:
 538                 return nfp_flower_setup_tc_block(netdev, type_data);
 539         default:
 540                 return -EOPNOTSUPP;
 541         }
 542 }