1 /* 2 * Copyright (C) 2017-2018 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 <net/pkt_cls.h> 35 36 #include "../nfpcore/nfp_cpp.h" 37 #include "../nfpcore/nfp_nffw.h" 38 #include "../nfpcore/nfp_nsp.h" 39 #include "../nfp_app.h" 40 #include "../nfp_main.h" 41 #include "../nfp_net.h" 42 #include "../nfp_port.h" 43 #include "fw.h" 44 #include "main.h" 45 46 const struct rhashtable_params nfp_bpf_maps_neutral_params = { 47 .nelem_hint = 4, 48 .key_len = FIELD_SIZEOF(struct nfp_bpf_neutral_map, ptr), 49 .key_offset = offsetof(struct nfp_bpf_neutral_map, ptr), 50 .head_offset = offsetof(struct nfp_bpf_neutral_map, l), 51 .automatic_shrinking = true, 52 }; 53 54 static bool nfp_net_ebpf_capable(struct nfp_net *nn) 55 { 56 #ifdef __LITTLE_ENDIAN 57 if (nn->cap & NFP_NET_CFG_CTRL_BPF && 58 nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI) 59 return true; 60 #endif 61 return false; 62 } 63 64 static int 65 nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn, 66 struct bpf_prog *prog, struct netlink_ext_ack *extack) 67 { 68 bool running, xdp_running; 69 int ret; 70 71 if (!nfp_net_ebpf_capable(nn)) 72 return -EINVAL; 73 74 running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF; 75 xdp_running = running && nn->dp.bpf_offload_xdp; 76 77 if (!prog && !xdp_running) 78 return 0; 79 if (prog && running && !xdp_running) 80 return -EBUSY; 81 82 ret = nfp_net_bpf_offload(nn, prog, running, extack); 83 /* Stop offload if replace not possible */ 84 if (ret && prog) 85 nfp_bpf_xdp_offload(app, nn, NULL, extack); 86 87 nn->dp.bpf_offload_xdp = prog && !ret; 88 return ret; 89 } 90 91 static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn) 92 { 93 return nfp_net_ebpf_capable(nn) ? "BPF" : ""; 94 } 95 96 static int 97 nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id) 98 { 99 struct nfp_pf *pf = app->pf; 100 struct nfp_bpf_vnic *bv; 101 int err; 102 103 if (!pf->eth_tbl) { 104 nfp_err(pf->cpp, "No ETH table\n"); 105 return -EINVAL; 106 } 107 if (pf->max_data_vnics != pf->eth_tbl->count) { 108 nfp_err(pf->cpp, "ETH entries don't match vNICs (%d vs %d)\n", 109 pf->max_data_vnics, pf->eth_tbl->count); 110 return -EINVAL; 111 } 112 113 bv = kzalloc(sizeof(*bv), GFP_KERNEL); 114 if (!bv) 115 return -ENOMEM; 116 nn->app_priv = bv; 117 118 err = nfp_app_nic_vnic_alloc(app, nn, id); 119 if (err) 120 goto err_free_priv; 121 122 bv->start_off = nn_readw(nn, NFP_NET_CFG_BPF_START); 123 bv->tgt_done = nn_readw(nn, NFP_NET_CFG_BPF_DONE); 124 125 return 0; 126 err_free_priv: 127 kfree(nn->app_priv); 128 return err; 129 } 130 131 static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn) 132 { 133 struct nfp_bpf_vnic *bv = nn->app_priv; 134 135 WARN_ON(bv->tc_prog); 136 kfree(bv); 137 } 138 139 static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, 140 void *type_data, void *cb_priv) 141 { 142 struct tc_cls_bpf_offload *cls_bpf = type_data; 143 struct nfp_net *nn = cb_priv; 144 struct bpf_prog *oldprog; 145 struct nfp_bpf_vnic *bv; 146 int err; 147 148 if (type != TC_SETUP_CLSBPF) { 149 NL_SET_ERR_MSG_MOD(cls_bpf->common.extack, 150 "only offload of BPF classifiers supported"); 151 return -EOPNOTSUPP; 152 } 153 if (!tc_cls_can_offload_and_chain0(nn->dp.netdev, &cls_bpf->common)) 154 return -EOPNOTSUPP; 155 if (!nfp_net_ebpf_capable(nn)) { 156 NL_SET_ERR_MSG_MOD(cls_bpf->common.extack, 157 "NFP firmware does not support eBPF offload"); 158 return -EOPNOTSUPP; 159 } 160 if (cls_bpf->common.protocol != htons(ETH_P_ALL)) { 161 NL_SET_ERR_MSG_MOD(cls_bpf->common.extack, 162 "only ETH_P_ALL supported as filter protocol"); 163 return -EOPNOTSUPP; 164 } 165 166 /* Only support TC direct action */ 167 if (!cls_bpf->exts_integrated || 168 tcf_exts_has_actions(cls_bpf->exts)) { 169 NL_SET_ERR_MSG_MOD(cls_bpf->common.extack, 170 "only direct action with no legacy actions supported"); 171 return -EOPNOTSUPP; 172 } 173 174 if (cls_bpf->command != TC_CLSBPF_OFFLOAD) 175 return -EOPNOTSUPP; 176 177 bv = nn->app_priv; 178 oldprog = cls_bpf->oldprog; 179 180 /* Don't remove if oldprog doesn't match driver's state */ 181 if (bv->tc_prog != oldprog) { 182 oldprog = NULL; 183 if (!cls_bpf->prog) 184 return 0; 185 } 186 187 err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog, 188 cls_bpf->common.extack); 189 if (err) 190 return err; 191 192 bv->tc_prog = cls_bpf->prog; 193 nn->port->tc_offload_cnt = !!bv->tc_prog; 194 return 0; 195 } 196 197 static int nfp_bpf_setup_tc_block(struct net_device *netdev, 198 struct tc_block_offload *f) 199 { 200 struct nfp_net *nn = netdev_priv(netdev); 201 202 if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS) 203 return -EOPNOTSUPP; 204 205 switch (f->command) { 206 case TC_BLOCK_BIND: 207 return tcf_block_cb_register(f->block, 208 nfp_bpf_setup_tc_block_cb, 209 nn, nn); 210 case TC_BLOCK_UNBIND: 211 tcf_block_cb_unregister(f->block, 212 nfp_bpf_setup_tc_block_cb, 213 nn); 214 return 0; 215 default: 216 return -EOPNOTSUPP; 217 } 218 } 219 220 static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev, 221 enum tc_setup_type type, void *type_data) 222 { 223 switch (type) { 224 case TC_SETUP_BLOCK: 225 return nfp_bpf_setup_tc_block(netdev, type_data); 226 default: 227 return -EOPNOTSUPP; 228 } 229 } 230 231 static int 232 nfp_bpf_check_mtu(struct nfp_app *app, struct net_device *netdev, int new_mtu) 233 { 234 struct nfp_net *nn = netdev_priv(netdev); 235 unsigned int max_mtu; 236 237 if (~nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) 238 return 0; 239 240 max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32; 241 if (new_mtu > max_mtu) { 242 nn_info(nn, "BPF offload active, MTU over %u not supported\n", 243 max_mtu); 244 return -EBUSY; 245 } 246 return 0; 247 } 248 249 static int 250 nfp_bpf_parse_cap_adjust_head(struct nfp_app_bpf *bpf, void __iomem *value, 251 u32 length) 252 { 253 struct nfp_bpf_cap_tlv_adjust_head __iomem *cap = value; 254 struct nfp_cpp *cpp = bpf->app->pf->cpp; 255 256 if (length < sizeof(*cap)) { 257 nfp_err(cpp, "truncated adjust_head TLV: %d\n", length); 258 return -EINVAL; 259 } 260 261 bpf->adjust_head.flags = readl(&cap->flags); 262 bpf->adjust_head.off_min = readl(&cap->off_min); 263 bpf->adjust_head.off_max = readl(&cap->off_max); 264 bpf->adjust_head.guaranteed_sub = readl(&cap->guaranteed_sub); 265 bpf->adjust_head.guaranteed_add = readl(&cap->guaranteed_add); 266 267 if (bpf->adjust_head.off_min > bpf->adjust_head.off_max) { 268 nfp_err(cpp, "invalid adjust_head TLV: min > max\n"); 269 return -EINVAL; 270 } 271 if (!FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_min) || 272 !FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_max)) { 273 nfp_warn(cpp, "disabling adjust_head - driver expects min/max to fit in as immediates\n"); 274 memset(&bpf->adjust_head, 0, sizeof(bpf->adjust_head)); 275 return 0; 276 } 277 278 return 0; 279 } 280 281 static int 282 nfp_bpf_parse_cap_func(struct nfp_app_bpf *bpf, void __iomem *value, u32 length) 283 { 284 struct nfp_bpf_cap_tlv_func __iomem *cap = value; 285 286 if (length < sizeof(*cap)) { 287 nfp_err(bpf->app->cpp, "truncated function TLV: %d\n", length); 288 return -EINVAL; 289 } 290 291 switch (readl(&cap->func_id)) { 292 case BPF_FUNC_map_lookup_elem: 293 bpf->helpers.map_lookup = readl(&cap->func_addr); 294 break; 295 case BPF_FUNC_map_update_elem: 296 bpf->helpers.map_update = readl(&cap->func_addr); 297 break; 298 case BPF_FUNC_map_delete_elem: 299 bpf->helpers.map_delete = readl(&cap->func_addr); 300 break; 301 case BPF_FUNC_perf_event_output: 302 bpf->helpers.perf_event_output = readl(&cap->func_addr); 303 break; 304 } 305 306 return 0; 307 } 308 309 static int 310 nfp_bpf_parse_cap_maps(struct nfp_app_bpf *bpf, void __iomem *value, u32 length) 311 { 312 struct nfp_bpf_cap_tlv_maps __iomem *cap = value; 313 314 if (length < sizeof(*cap)) { 315 nfp_err(bpf->app->cpp, "truncated maps TLV: %d\n", length); 316 return -EINVAL; 317 } 318 319 bpf->maps.types = readl(&cap->types); 320 bpf->maps.max_maps = readl(&cap->max_maps); 321 bpf->maps.max_elems = readl(&cap->max_elems); 322 bpf->maps.max_key_sz = readl(&cap->max_key_sz); 323 bpf->maps.max_val_sz = readl(&cap->max_val_sz); 324 bpf->maps.max_elem_sz = readl(&cap->max_elem_sz); 325 326 return 0; 327 } 328 329 static int 330 nfp_bpf_parse_cap_random(struct nfp_app_bpf *bpf, void __iomem *value, 331 u32 length) 332 { 333 bpf->pseudo_random = true; 334 return 0; 335 } 336 337 static int nfp_bpf_parse_capabilities(struct nfp_app *app) 338 { 339 struct nfp_cpp *cpp = app->pf->cpp; 340 struct nfp_cpp_area *area; 341 u8 __iomem *mem, *start; 342 343 mem = nfp_rtsym_map(app->pf->rtbl, "_abi_bpf_capabilities", "bpf.cap", 344 8, &area); 345 if (IS_ERR(mem)) 346 return PTR_ERR(mem) == -ENOENT ? 0 : PTR_ERR(mem); 347 348 start = mem; 349 while (mem - start + 8 < nfp_cpp_area_size(area)) { 350 u8 __iomem *value; 351 u32 type, length; 352 353 type = readl(mem); 354 length = readl(mem + 4); 355 value = mem + 8; 356 357 mem += 8 + length; 358 if (mem - start > nfp_cpp_area_size(area)) 359 goto err_release_free; 360 361 switch (type) { 362 case NFP_BPF_CAP_TYPE_FUNC: 363 if (nfp_bpf_parse_cap_func(app->priv, value, length)) 364 goto err_release_free; 365 break; 366 case NFP_BPF_CAP_TYPE_ADJUST_HEAD: 367 if (nfp_bpf_parse_cap_adjust_head(app->priv, value, 368 length)) 369 goto err_release_free; 370 break; 371 case NFP_BPF_CAP_TYPE_MAPS: 372 if (nfp_bpf_parse_cap_maps(app->priv, value, length)) 373 goto err_release_free; 374 break; 375 case NFP_BPF_CAP_TYPE_RANDOM: 376 if (nfp_bpf_parse_cap_random(app->priv, value, length)) 377 goto err_release_free; 378 break; 379 default: 380 nfp_dbg(cpp, "unknown BPF capability: %d\n", type); 381 break; 382 } 383 } 384 if (mem - start != nfp_cpp_area_size(area)) { 385 nfp_err(cpp, "BPF capabilities left after parsing, parsed:%zd total length:%zu\n", 386 mem - start, nfp_cpp_area_size(area)); 387 goto err_release_free; 388 } 389 390 nfp_cpp_area_release_free(area); 391 392 return 0; 393 394 err_release_free: 395 nfp_err(cpp, "invalid BPF capabilities at offset:%zd\n", mem - start); 396 nfp_cpp_area_release_free(area); 397 return -EINVAL; 398 } 399 400 static int nfp_bpf_init(struct nfp_app *app) 401 { 402 struct nfp_app_bpf *bpf; 403 int err; 404 405 bpf = kzalloc(sizeof(*bpf), GFP_KERNEL); 406 if (!bpf) 407 return -ENOMEM; 408 bpf->app = app; 409 app->priv = bpf; 410 411 skb_queue_head_init(&bpf->cmsg_replies); 412 init_waitqueue_head(&bpf->cmsg_wq); 413 INIT_LIST_HEAD(&bpf->map_list); 414 415 err = rhashtable_init(&bpf->maps_neutral, &nfp_bpf_maps_neutral_params); 416 if (err) 417 goto err_free_bpf; 418 419 err = nfp_bpf_parse_capabilities(app); 420 if (err) 421 goto err_free_neutral_maps; 422 423 return 0; 424 425 err_free_neutral_maps: 426 rhashtable_destroy(&bpf->maps_neutral); 427 err_free_bpf: 428 kfree(bpf); 429 return err; 430 } 431 432 static void nfp_check_rhashtable_empty(void *ptr, void *arg) 433 { 434 WARN_ON_ONCE(1); 435 } 436 437 static void nfp_bpf_clean(struct nfp_app *app) 438 { 439 struct nfp_app_bpf *bpf = app->priv; 440 441 WARN_ON(!skb_queue_empty(&bpf->cmsg_replies)); 442 WARN_ON(!list_empty(&bpf->map_list)); 443 WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use); 444 rhashtable_free_and_destroy(&bpf->maps_neutral, 445 nfp_check_rhashtable_empty, NULL); 446 kfree(bpf); 447 } 448 449 const struct nfp_app_type app_bpf = { 450 .id = NFP_APP_BPF_NIC, 451 .name = "ebpf", 452 453 .ctrl_cap_mask = 0, 454 455 .init = nfp_bpf_init, 456 .clean = nfp_bpf_clean, 457 458 .check_mtu = nfp_bpf_check_mtu, 459 460 .extra_cap = nfp_bpf_extra_cap, 461 462 .vnic_alloc = nfp_bpf_vnic_alloc, 463 .vnic_free = nfp_bpf_vnic_free, 464 465 .ctrl_msg_rx = nfp_bpf_ctrl_msg_rx, 466 467 .setup_tc = nfp_bpf_setup_tc, 468 .bpf = nfp_ndo_bpf, 469 .xdp_offload = nfp_bpf_xdp_offload, 470 }; 471