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 static int 48 nfp_flower_xmit_flow(struct net_device *netdev, 49 struct nfp_fl_payload *nfp_flow, u8 mtype) 50 { 51 u32 meta_len, key_len, mask_len, act_len, tot_len; 52 struct nfp_repr *priv = netdev_priv(netdev); 53 struct sk_buff *skb; 54 unsigned char *msg; 55 56 meta_len = sizeof(struct nfp_fl_rule_metadata); 57 key_len = nfp_flow->meta.key_len; 58 mask_len = nfp_flow->meta.mask_len; 59 act_len = nfp_flow->meta.act_len; 60 61 tot_len = meta_len + key_len + mask_len + act_len; 62 63 /* Convert to long words as firmware expects 64 * lengths in units of NFP_FL_LW_SIZ. 65 */ 66 nfp_flow->meta.key_len >>= NFP_FL_LW_SIZ; 67 nfp_flow->meta.mask_len >>= NFP_FL_LW_SIZ; 68 nfp_flow->meta.act_len >>= NFP_FL_LW_SIZ; 69 70 skb = nfp_flower_cmsg_alloc(priv->app, tot_len, mtype); 71 if (!skb) 72 return -ENOMEM; 73 74 msg = nfp_flower_cmsg_get_data(skb); 75 memcpy(msg, &nfp_flow->meta, meta_len); 76 memcpy(&msg[meta_len], nfp_flow->unmasked_data, key_len); 77 memcpy(&msg[meta_len + key_len], nfp_flow->mask_data, mask_len); 78 memcpy(&msg[meta_len + key_len + mask_len], 79 nfp_flow->action_data, act_len); 80 81 /* Convert back to bytes as software expects 82 * lengths in units of bytes. 83 */ 84 nfp_flow->meta.key_len <<= NFP_FL_LW_SIZ; 85 nfp_flow->meta.mask_len <<= NFP_FL_LW_SIZ; 86 nfp_flow->meta.act_len <<= NFP_FL_LW_SIZ; 87 88 nfp_ctrl_tx(priv->app->ctrl, skb); 89 90 return 0; 91 } 92 93 static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f) 94 { 95 return dissector_uses_key(f->dissector, 96 FLOW_DISSECTOR_KEY_IPV4_ADDRS) || 97 dissector_uses_key(f->dissector, 98 FLOW_DISSECTOR_KEY_IPV6_ADDRS) || 99 dissector_uses_key(f->dissector, 100 FLOW_DISSECTOR_KEY_PORTS) || 101 dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP); 102 } 103 104 static int 105 nfp_flower_calculate_key_layers(struct nfp_fl_key_ls *ret_key_ls, 106 struct tc_cls_flower_offload *flow) 107 { 108 struct flow_dissector_key_basic *mask_basic = NULL; 109 struct flow_dissector_key_basic *key_basic = NULL; 110 struct flow_dissector_key_ip *mask_ip = NULL; 111 u32 key_layer_two; 112 u8 key_layer; 113 int key_size; 114 115 if (dissector_uses_key(flow->dissector, 116 FLOW_DISSECTOR_KEY_ENC_CONTROL)) { 117 struct flow_dissector_key_control *mask_enc_ctl = 118 skb_flow_dissector_target(flow->dissector, 119 FLOW_DISSECTOR_KEY_ENC_CONTROL, 120 flow->mask); 121 /* We are expecting a tunnel. For now we ignore offloading. */ 122 if (mask_enc_ctl->addr_type) 123 return -EOPNOTSUPP; 124 } 125 126 if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) { 127 mask_basic = skb_flow_dissector_target(flow->dissector, 128 FLOW_DISSECTOR_KEY_BASIC, 129 flow->mask); 130 131 key_basic = skb_flow_dissector_target(flow->dissector, 132 FLOW_DISSECTOR_KEY_BASIC, 133 flow->key); 134 } 135 136 if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_IP)) 137 mask_ip = skb_flow_dissector_target(flow->dissector, 138 FLOW_DISSECTOR_KEY_IP, 139 flow->mask); 140 141 key_layer_two = 0; 142 key_layer = NFP_FLOWER_LAYER_PORT | NFP_FLOWER_LAYER_MAC; 143 key_size = sizeof(struct nfp_flower_meta_one) + 144 sizeof(struct nfp_flower_in_port) + 145 sizeof(struct nfp_flower_mac_mpls); 146 147 if (mask_basic && mask_basic->n_proto) { 148 /* Ethernet type is present in the key. */ 149 switch (key_basic->n_proto) { 150 case cpu_to_be16(ETH_P_IP): 151 if (mask_ip && mask_ip->tos) 152 return -EOPNOTSUPP; 153 if (mask_ip && mask_ip->ttl) 154 return -EOPNOTSUPP; 155 key_layer |= NFP_FLOWER_LAYER_IPV4; 156 key_size += sizeof(struct nfp_flower_ipv4); 157 break; 158 159 case cpu_to_be16(ETH_P_IPV6): 160 if (mask_ip && mask_ip->tos) 161 return -EOPNOTSUPP; 162 if (mask_ip && mask_ip->ttl) 163 return -EOPNOTSUPP; 164 key_layer |= NFP_FLOWER_LAYER_IPV6; 165 key_size += sizeof(struct nfp_flower_ipv6); 166 break; 167 168 /* Currently we do not offload ARP 169 * because we rely on it to get to the host. 170 */ 171 case cpu_to_be16(ETH_P_ARP): 172 return -EOPNOTSUPP; 173 174 /* Currently we do not offload MPLS. */ 175 case cpu_to_be16(ETH_P_MPLS_UC): 176 case cpu_to_be16(ETH_P_MPLS_MC): 177 return -EOPNOTSUPP; 178 179 /* Will be included in layer 2. */ 180 case cpu_to_be16(ETH_P_8021Q): 181 break; 182 183 default: 184 /* Other ethtype - we need check the masks for the 185 * remainder of the key to ensure we can offload. 186 */ 187 if (nfp_flower_check_higher_than_mac(flow)) 188 return -EOPNOTSUPP; 189 break; 190 } 191 } 192 193 if (mask_basic && mask_basic->ip_proto) { 194 /* Ethernet type is present in the key. */ 195 switch (key_basic->ip_proto) { 196 case IPPROTO_TCP: 197 case IPPROTO_UDP: 198 case IPPROTO_SCTP: 199 case IPPROTO_ICMP: 200 case IPPROTO_ICMPV6: 201 key_layer |= NFP_FLOWER_LAYER_TP; 202 key_size += sizeof(struct nfp_flower_tp_ports); 203 break; 204 default: 205 /* Other ip proto - we need check the masks for the 206 * remainder of the key to ensure we can offload. 207 */ 208 return -EOPNOTSUPP; 209 } 210 } 211 212 ret_key_ls->key_layer = key_layer; 213 ret_key_ls->key_layer_two = key_layer_two; 214 ret_key_ls->key_size = key_size; 215 216 return 0; 217 } 218 219 static struct nfp_fl_payload * 220 nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer) 221 { 222 struct nfp_fl_payload *flow_pay; 223 224 flow_pay = kmalloc(sizeof(*flow_pay), GFP_KERNEL); 225 if (!flow_pay) 226 return NULL; 227 228 flow_pay->meta.key_len = key_layer->key_size; 229 flow_pay->unmasked_data = kmalloc(key_layer->key_size, GFP_KERNEL); 230 if (!flow_pay->unmasked_data) 231 goto err_free_flow; 232 233 flow_pay->meta.mask_len = key_layer->key_size; 234 flow_pay->mask_data = kmalloc(key_layer->key_size, GFP_KERNEL); 235 if (!flow_pay->mask_data) 236 goto err_free_unmasked; 237 238 flow_pay->action_data = kmalloc(NFP_FL_MAX_A_SIZ, GFP_KERNEL); 239 if (!flow_pay->action_data) 240 goto err_free_mask; 241 242 flow_pay->meta.flags = 0; 243 spin_lock_init(&flow_pay->lock); 244 245 return flow_pay; 246 247 err_free_mask: 248 kfree(flow_pay->mask_data); 249 err_free_unmasked: 250 kfree(flow_pay->unmasked_data); 251 err_free_flow: 252 kfree(flow_pay); 253 return NULL; 254 } 255 256 /** 257 * nfp_flower_add_offload() - Adds a new flow to hardware. 258 * @app: Pointer to the APP handle 259 * @netdev: netdev structure. 260 * @flow: TC flower classifier offload structure. 261 * 262 * Adds a new flow to the repeated hash structure and action payload. 263 * 264 * Return: negative value on error, 0 if configured successfully. 265 */ 266 static int 267 nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev, 268 struct tc_cls_flower_offload *flow) 269 { 270 struct nfp_flower_priv *priv = app->priv; 271 struct nfp_fl_payload *flow_pay; 272 struct nfp_fl_key_ls *key_layer; 273 int err; 274 275 key_layer = kmalloc(sizeof(*key_layer), GFP_KERNEL); 276 if (!key_layer) 277 return -ENOMEM; 278 279 err = nfp_flower_calculate_key_layers(key_layer, flow); 280 if (err) 281 goto err_free_key_ls; 282 283 flow_pay = nfp_flower_allocate_new(key_layer); 284 if (!flow_pay) { 285 err = -ENOMEM; 286 goto err_free_key_ls; 287 } 288 289 err = nfp_flower_compile_flow_match(flow, key_layer, netdev, flow_pay); 290 if (err) 291 goto err_destroy_flow; 292 293 err = nfp_flower_compile_action(flow, netdev, flow_pay); 294 if (err) 295 goto err_destroy_flow; 296 297 err = nfp_compile_flow_metadata(app, flow, flow_pay); 298 if (err) 299 goto err_destroy_flow; 300 301 err = nfp_flower_xmit_flow(netdev, flow_pay, 302 NFP_FLOWER_CMSG_TYPE_FLOW_ADD); 303 if (err) 304 goto err_destroy_flow; 305 306 INIT_HLIST_NODE(&flow_pay->link); 307 flow_pay->tc_flower_cookie = flow->cookie; 308 hash_add_rcu(priv->flow_table, &flow_pay->link, flow->cookie); 309 310 /* Deallocate flow payload when flower rule has been destroyed. */ 311 kfree(key_layer); 312 313 return 0; 314 315 err_destroy_flow: 316 kfree(flow_pay->action_data); 317 kfree(flow_pay->mask_data); 318 kfree(flow_pay->unmasked_data); 319 kfree(flow_pay); 320 err_free_key_ls: 321 kfree(key_layer); 322 return err; 323 } 324 325 /** 326 * nfp_flower_del_offload() - Removes a flow from hardware. 327 * @app: Pointer to the APP handle 328 * @netdev: netdev structure. 329 * @flow: TC flower classifier offload structure 330 * 331 * Removes a flow from the repeated hash structure and clears the 332 * action payload. 333 * 334 * Return: negative value on error, 0 if removed successfully. 335 */ 336 static int 337 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev, 338 struct tc_cls_flower_offload *flow) 339 { 340 struct nfp_fl_payload *nfp_flow; 341 int err; 342 343 nfp_flow = nfp_flower_search_fl_table(app, flow->cookie); 344 if (!nfp_flow) 345 return -ENOENT; 346 347 err = nfp_modify_flow_metadata(app, nfp_flow); 348 if (err) 349 goto err_free_flow; 350 351 err = nfp_flower_xmit_flow(netdev, nfp_flow, 352 NFP_FLOWER_CMSG_TYPE_FLOW_DEL); 353 if (err) 354 goto err_free_flow; 355 356 err_free_flow: 357 hash_del_rcu(&nfp_flow->link); 358 kfree(nfp_flow->action_data); 359 kfree(nfp_flow->mask_data); 360 kfree(nfp_flow->unmasked_data); 361 kfree_rcu(nfp_flow, rcu); 362 return err; 363 } 364 365 /** 366 * nfp_flower_get_stats() - Populates flow stats obtained from hardware. 367 * @app: Pointer to the APP handle 368 * @flow: TC flower classifier offload structure 369 * 370 * Populates a flow statistics structure which which corresponds to a 371 * specific flow. 372 * 373 * Return: negative value on error, 0 if stats populated successfully. 374 */ 375 static int 376 nfp_flower_get_stats(struct nfp_app *app, struct tc_cls_flower_offload *flow) 377 { 378 struct nfp_fl_payload *nfp_flow; 379 380 nfp_flow = nfp_flower_search_fl_table(app, flow->cookie); 381 if (!nfp_flow) 382 return -EINVAL; 383 384 spin_lock_bh(&nfp_flow->lock); 385 tcf_exts_stats_update(flow->exts, nfp_flow->stats.bytes, 386 nfp_flow->stats.pkts, nfp_flow->stats.used); 387 388 nfp_flow->stats.pkts = 0; 389 nfp_flow->stats.bytes = 0; 390 spin_unlock_bh(&nfp_flow->lock); 391 392 return 0; 393 } 394 395 static int 396 nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev, 397 struct tc_cls_flower_offload *flower) 398 { 399 switch (flower->command) { 400 case TC_CLSFLOWER_REPLACE: 401 return nfp_flower_add_offload(app, netdev, flower); 402 case TC_CLSFLOWER_DESTROY: 403 return nfp_flower_del_offload(app, netdev, flower); 404 case TC_CLSFLOWER_STATS: 405 return nfp_flower_get_stats(app, flower); 406 } 407 408 return -EOPNOTSUPP; 409 } 410 411 int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev, 412 u32 handle, __be16 proto, struct tc_to_netdev *tc) 413 { 414 if (TC_H_MAJ(handle) != TC_H_MAJ(TC_H_INGRESS)) 415 return -EOPNOTSUPP; 416 417 if (!eth_proto_is_802_3(proto)) 418 return -EOPNOTSUPP; 419 420 if (tc->type != TC_SETUP_CLSFLOWER) 421 return -EINVAL; 422 423 return nfp_flower_repr_offload(app, netdev, tc->cls_flower); 424 } 425