1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* include/net/xdp.h 3 * 4 * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc. 5 */ 6 #ifndef __LINUX_NET_XDP_H__ 7 #define __LINUX_NET_XDP_H__ 8 9 #include <linux/bitfield.h> 10 #include <linux/filter.h> 11 #include <linux/netdevice.h> 12 #include <linux/skbuff.h> /* skb_shared_info */ 13 14 #include <net/page_pool/types.h> 15 16 /** 17 * DOC: XDP RX-queue information 18 * 19 * The XDP RX-queue info (xdp_rxq_info) is associated with the driver 20 * level RX-ring queues. It is information that is specific to how 21 * the driver has configured a given RX-ring queue. 22 * 23 * Each xdp_buff frame received in the driver carries a (pointer) 24 * reference to this xdp_rxq_info structure. This provides the XDP 25 * data-path read-access to RX-info for both kernel and bpf-side 26 * (limited subset). 27 * 28 * For now, direct access is only safe while running in NAPI/softirq 29 * context. Contents are read-mostly and must not be updated during 30 * driver NAPI/softirq poll. 31 * 32 * The driver usage API is a register and unregister API. 33 * 34 * The struct is not directly tied to the XDP prog. A new XDP prog 35 * can be attached as long as it doesn't change the underlying 36 * RX-ring. If the RX-ring does change significantly, the NIC driver 37 * naturally needs to stop the RX-ring before purging and reallocating 38 * memory. In that process the driver MUST call unregister (which 39 * also applies for driver shutdown and unload). The register API is 40 * also mandatory during RX-ring setup. 41 */ 42 43 enum xdp_mem_type { 44 MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */ 45 MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */ 46 MEM_TYPE_PAGE_POOL, 47 MEM_TYPE_XSK_BUFF_POOL, 48 MEM_TYPE_MAX, 49 }; 50 51 /* XDP flags for ndo_xdp_xmit */ 52 #define XDP_XMIT_FLUSH (1U << 0) /* doorbell signal consumer */ 53 #define XDP_XMIT_FLAGS_MASK XDP_XMIT_FLUSH 54 55 struct xdp_mem_info { 56 u32 type; /* enum xdp_mem_type, but known size type */ 57 u32 id; 58 }; 59 60 struct page_pool; 61 62 struct xdp_rxq_info { 63 struct net_device *dev; 64 u32 queue_index; 65 u32 reg_state; 66 struct xdp_mem_info mem; 67 unsigned int napi_id; 68 u32 frag_size; 69 } ____cacheline_aligned; /* perf critical, avoid false-sharing */ 70 71 struct xdp_txq_info { 72 struct net_device *dev; 73 }; 74 75 enum xdp_buff_flags { 76 XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */ 77 XDP_FLAGS_FRAGS_PF_MEMALLOC = BIT(1), /* xdp paged memory is under 78 * pressure 79 */ 80 }; 81 82 struct xdp_buff { 83 void *data; 84 void *data_end; 85 void *data_meta; 86 void *data_hard_start; 87 struct xdp_rxq_info *rxq; 88 struct xdp_txq_info *txq; 89 u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/ 90 u32 flags; /* supported values defined in xdp_buff_flags */ 91 }; 92 93 static __always_inline bool xdp_buff_has_frags(const struct xdp_buff *xdp) 94 { 95 return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS); 96 } 97 98 static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp) 99 { 100 xdp->flags |= XDP_FLAGS_HAS_FRAGS; 101 } 102 103 static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp) 104 { 105 xdp->flags &= ~XDP_FLAGS_HAS_FRAGS; 106 } 107 108 static __always_inline bool 109 xdp_buff_is_frag_pfmemalloc(const struct xdp_buff *xdp) 110 { 111 return !!(xdp->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 112 } 113 114 static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp) 115 { 116 xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC; 117 } 118 119 static __always_inline void 120 xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq) 121 { 122 xdp->frame_sz = frame_sz; 123 xdp->rxq = rxq; 124 xdp->flags = 0; 125 } 126 127 static __always_inline void 128 xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start, 129 int headroom, int data_len, const bool meta_valid) 130 { 131 unsigned char *data = hard_start + headroom; 132 133 xdp->data_hard_start = hard_start; 134 xdp->data = data; 135 xdp->data_end = data + data_len; 136 xdp->data_meta = meta_valid ? data : data + 1; 137 } 138 139 /* Reserve memory area at end-of data area. 140 * 141 * This macro reserves tailroom in the XDP buffer by limiting the 142 * XDP/BPF data access to data_hard_end. Notice same area (and size) 143 * is used for XDP_PASS, when constructing the SKB via build_skb(). 144 */ 145 #define xdp_data_hard_end(xdp) \ 146 ((xdp)->data_hard_start + (xdp)->frame_sz - \ 147 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 148 149 static inline struct skb_shared_info * 150 xdp_get_shared_info_from_buff(const struct xdp_buff *xdp) 151 { 152 return (struct skb_shared_info *)xdp_data_hard_end(xdp); 153 } 154 155 static __always_inline unsigned int 156 xdp_get_buff_len(const struct xdp_buff *xdp) 157 { 158 unsigned int len = xdp->data_end - xdp->data; 159 const struct skb_shared_info *sinfo; 160 161 if (likely(!xdp_buff_has_frags(xdp))) 162 goto out; 163 164 sinfo = xdp_get_shared_info_from_buff(xdp); 165 len += sinfo->xdp_frags_size; 166 out: 167 return len; 168 } 169 170 struct xdp_frame { 171 void *data; 172 u16 len; 173 u16 headroom; 174 u32 metasize; /* uses lower 8-bits */ 175 /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time, 176 * while mem info is valid on remote CPU. 177 */ 178 struct xdp_mem_info mem; 179 struct net_device *dev_rx; /* used by cpumap */ 180 u32 frame_sz; 181 u32 flags; /* supported values defined in xdp_buff_flags */ 182 }; 183 184 static __always_inline bool xdp_frame_has_frags(const struct xdp_frame *frame) 185 { 186 return !!(frame->flags & XDP_FLAGS_HAS_FRAGS); 187 } 188 189 static __always_inline bool 190 xdp_frame_is_frag_pfmemalloc(const struct xdp_frame *frame) 191 { 192 return !!(frame->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 193 } 194 195 #define XDP_BULK_QUEUE_SIZE 16 196 struct xdp_frame_bulk { 197 int count; 198 netmem_ref q[XDP_BULK_QUEUE_SIZE]; 199 }; 200 201 static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq) 202 { 203 bq->count = 0; 204 } 205 206 static inline struct skb_shared_info * 207 xdp_get_shared_info_from_frame(const struct xdp_frame *frame) 208 { 209 void *data_hard_start = frame->data - frame->headroom - sizeof(*frame); 210 211 return (struct skb_shared_info *)(data_hard_start + frame->frame_sz - 212 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 213 } 214 215 struct xdp_cpumap_stats { 216 unsigned int redirect; 217 unsigned int pass; 218 unsigned int drop; 219 }; 220 221 /* Clear kernel pointers in xdp_frame */ 222 static inline void xdp_scrub_frame(struct xdp_frame *frame) 223 { 224 frame->data = NULL; 225 frame->dev_rx = NULL; 226 } 227 228 static inline void 229 xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags, 230 unsigned int size, unsigned int truesize, 231 bool pfmemalloc) 232 { 233 skb_shinfo(skb)->nr_frags = nr_frags; 234 235 skb->len += size; 236 skb->data_len += size; 237 skb->truesize += truesize; 238 skb->pfmemalloc |= pfmemalloc; 239 } 240 241 /* Avoids inlining WARN macro in fast-path */ 242 void xdp_warn(const char *msg, const char *func, const int line); 243 #define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__) 244 245 struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp); 246 struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, 247 struct sk_buff *skb, 248 struct net_device *dev); 249 struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, 250 struct net_device *dev); 251 int xdp_alloc_skb_bulk(void **skbs, int n_skb, gfp_t gfp); 252 struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf); 253 254 static inline 255 void xdp_convert_frame_to_buff(const struct xdp_frame *frame, 256 struct xdp_buff *xdp) 257 { 258 xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame); 259 xdp->data = frame->data; 260 xdp->data_end = frame->data + frame->len; 261 xdp->data_meta = frame->data - frame->metasize; 262 xdp->frame_sz = frame->frame_sz; 263 xdp->flags = frame->flags; 264 } 265 266 static inline 267 int xdp_update_frame_from_buff(const struct xdp_buff *xdp, 268 struct xdp_frame *xdp_frame) 269 { 270 int metasize, headroom; 271 272 /* Assure headroom is available for storing info */ 273 headroom = xdp->data - xdp->data_hard_start; 274 metasize = xdp->data - xdp->data_meta; 275 metasize = metasize > 0 ? metasize : 0; 276 if (unlikely((headroom - metasize) < sizeof(*xdp_frame))) 277 return -ENOSPC; 278 279 /* Catch if driver didn't reserve tailroom for skb_shared_info */ 280 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 281 XDP_WARN("Driver BUG: missing reserved tailroom"); 282 return -ENOSPC; 283 } 284 285 xdp_frame->data = xdp->data; 286 xdp_frame->len = xdp->data_end - xdp->data; 287 xdp_frame->headroom = headroom - sizeof(*xdp_frame); 288 xdp_frame->metasize = metasize; 289 xdp_frame->frame_sz = xdp->frame_sz; 290 xdp_frame->flags = xdp->flags; 291 292 return 0; 293 } 294 295 /* Convert xdp_buff to xdp_frame */ 296 static inline 297 struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp) 298 { 299 struct xdp_frame *xdp_frame; 300 301 if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) 302 return xdp_convert_zc_to_xdp_frame(xdp); 303 304 /* Store info in top of packet */ 305 xdp_frame = xdp->data_hard_start; 306 if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0)) 307 return NULL; 308 309 /* rxq only valid until napi_schedule ends, convert to xdp_mem_info */ 310 xdp_frame->mem = xdp->rxq->mem; 311 312 return xdp_frame; 313 } 314 315 void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, 316 struct xdp_buff *xdp); 317 void xdp_return_frame(struct xdp_frame *xdpf); 318 void xdp_return_frame_rx_napi(struct xdp_frame *xdpf); 319 void xdp_return_buff(struct xdp_buff *xdp); 320 void xdp_return_frame_bulk(struct xdp_frame *xdpf, 321 struct xdp_frame_bulk *bq); 322 323 static inline void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) 324 { 325 if (unlikely(!bq->count)) 326 return; 327 328 page_pool_put_netmem_bulk(bq->q, bq->count); 329 bq->count = 0; 330 } 331 332 static __always_inline unsigned int 333 xdp_get_frame_len(const struct xdp_frame *xdpf) 334 { 335 const struct skb_shared_info *sinfo; 336 unsigned int len = xdpf->len; 337 338 if (likely(!xdp_frame_has_frags(xdpf))) 339 goto out; 340 341 sinfo = xdp_get_shared_info_from_frame(xdpf); 342 len += sinfo->xdp_frags_size; 343 out: 344 return len; 345 } 346 347 int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 348 struct net_device *dev, u32 queue_index, 349 unsigned int napi_id, u32 frag_size); 350 static inline int 351 xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 352 struct net_device *dev, u32 queue_index, 353 unsigned int napi_id) 354 { 355 return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0); 356 } 357 358 void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq); 359 void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq); 360 bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq); 361 int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, 362 enum xdp_mem_type type, void *allocator); 363 void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq); 364 int xdp_reg_mem_model(struct xdp_mem_info *mem, 365 enum xdp_mem_type type, void *allocator); 366 void xdp_unreg_mem_model(struct xdp_mem_info *mem); 367 int xdp_reg_page_pool(struct page_pool *pool); 368 void xdp_unreg_page_pool(const struct page_pool *pool); 369 void xdp_rxq_info_attach_page_pool(struct xdp_rxq_info *xdp_rxq, 370 const struct page_pool *pool); 371 372 /** 373 * xdp_rxq_info_attach_mem_model - attach registered mem info to RxQ info 374 * @xdp_rxq: XDP RxQ info to attach the memory info to 375 * @mem: already registered memory info 376 * 377 * If the driver registers its memory providers manually, it must use this 378 * function instead of xdp_rxq_info_reg_mem_model(). 379 */ 380 static inline void 381 xdp_rxq_info_attach_mem_model(struct xdp_rxq_info *xdp_rxq, 382 const struct xdp_mem_info *mem) 383 { 384 xdp_rxq->mem = *mem; 385 } 386 387 /** 388 * xdp_rxq_info_detach_mem_model - detach registered mem info from RxQ info 389 * @xdp_rxq: XDP RxQ info to detach the memory info from 390 * 391 * If the driver registers its memory providers manually and then attaches it 392 * via xdp_rxq_info_attach_mem_model(), it must call this function before 393 * xdp_rxq_info_unreg(). 394 */ 395 static inline void xdp_rxq_info_detach_mem_model(struct xdp_rxq_info *xdp_rxq) 396 { 397 xdp_rxq->mem = (struct xdp_mem_info){ }; 398 } 399 400 /* Drivers not supporting XDP metadata can use this helper, which 401 * rejects any room expansion for metadata as a result. 402 */ 403 static __always_inline void 404 xdp_set_data_meta_invalid(struct xdp_buff *xdp) 405 { 406 xdp->data_meta = xdp->data + 1; 407 } 408 409 static __always_inline bool 410 xdp_data_meta_unsupported(const struct xdp_buff *xdp) 411 { 412 return unlikely(xdp->data_meta > xdp->data); 413 } 414 415 static inline bool xdp_metalen_invalid(unsigned long metalen) 416 { 417 unsigned long meta_max; 418 419 meta_max = type_max(typeof_member(struct skb_shared_info, meta_len)); 420 BUILD_BUG_ON(!__builtin_constant_p(meta_max)); 421 422 return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max; 423 } 424 425 struct xdp_attachment_info { 426 struct bpf_prog *prog; 427 u32 flags; 428 }; 429 430 struct netdev_bpf; 431 void xdp_attachment_setup(struct xdp_attachment_info *info, 432 struct netdev_bpf *bpf); 433 434 #define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE 435 436 /* Define the relationship between xdp-rx-metadata kfunc and 437 * various other entities: 438 * - xdp_rx_metadata enum 439 * - netdev netlink enum (Documentation/netlink/specs/netdev.yaml) 440 * - kfunc name 441 * - xdp_metadata_ops field 442 */ 443 #define XDP_METADATA_KFUNC_xxx \ 444 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \ 445 NETDEV_XDP_RX_METADATA_TIMESTAMP, \ 446 bpf_xdp_metadata_rx_timestamp, \ 447 xmo_rx_timestamp) \ 448 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \ 449 NETDEV_XDP_RX_METADATA_HASH, \ 450 bpf_xdp_metadata_rx_hash, \ 451 xmo_rx_hash) \ 452 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \ 453 NETDEV_XDP_RX_METADATA_VLAN_TAG, \ 454 bpf_xdp_metadata_rx_vlan_tag, \ 455 xmo_rx_vlan_tag) \ 456 457 enum xdp_rx_metadata { 458 #define XDP_METADATA_KFUNC(name, _, __, ___) name, 459 XDP_METADATA_KFUNC_xxx 460 #undef XDP_METADATA_KFUNC 461 MAX_XDP_METADATA_KFUNC, 462 }; 463 464 enum xdp_rss_hash_type { 465 /* First part: Individual bits for L3/L4 types */ 466 XDP_RSS_L3_IPV4 = BIT(0), 467 XDP_RSS_L3_IPV6 = BIT(1), 468 469 /* The fixed (L3) IPv4 and IPv6 headers can both be followed by 470 * variable/dynamic headers, IPv4 called Options and IPv6 called 471 * Extension Headers. HW RSS type can contain this info. 472 */ 473 XDP_RSS_L3_DYNHDR = BIT(2), 474 475 /* When RSS hash covers L4 then drivers MUST set XDP_RSS_L4 bit in 476 * addition to the protocol specific bit. This ease interaction with 477 * SKBs and avoids reserving a fixed mask for future L4 protocol bits. 478 */ 479 XDP_RSS_L4 = BIT(3), /* L4 based hash, proto can be unknown */ 480 XDP_RSS_L4_TCP = BIT(4), 481 XDP_RSS_L4_UDP = BIT(5), 482 XDP_RSS_L4_SCTP = BIT(6), 483 XDP_RSS_L4_IPSEC = BIT(7), /* L4 based hash include IPSEC SPI */ 484 XDP_RSS_L4_ICMP = BIT(8), 485 486 /* Second part: RSS hash type combinations used for driver HW mapping */ 487 XDP_RSS_TYPE_NONE = 0, 488 XDP_RSS_TYPE_L2 = XDP_RSS_TYPE_NONE, 489 490 XDP_RSS_TYPE_L3_IPV4 = XDP_RSS_L3_IPV4, 491 XDP_RSS_TYPE_L3_IPV6 = XDP_RSS_L3_IPV6, 492 XDP_RSS_TYPE_L3_IPV4_OPT = XDP_RSS_L3_IPV4 | XDP_RSS_L3_DYNHDR, 493 XDP_RSS_TYPE_L3_IPV6_EX = XDP_RSS_L3_IPV6 | XDP_RSS_L3_DYNHDR, 494 495 XDP_RSS_TYPE_L4_ANY = XDP_RSS_L4, 496 XDP_RSS_TYPE_L4_IPV4_TCP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_TCP, 497 XDP_RSS_TYPE_L4_IPV4_UDP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP, 498 XDP_RSS_TYPE_L4_IPV4_SCTP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP, 499 XDP_RSS_TYPE_L4_IPV4_IPSEC = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC, 500 XDP_RSS_TYPE_L4_IPV4_ICMP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_ICMP, 501 502 XDP_RSS_TYPE_L4_IPV6_TCP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP, 503 XDP_RSS_TYPE_L4_IPV6_UDP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP, 504 XDP_RSS_TYPE_L4_IPV6_SCTP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP, 505 XDP_RSS_TYPE_L4_IPV6_IPSEC = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC, 506 XDP_RSS_TYPE_L4_IPV6_ICMP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_ICMP, 507 508 XDP_RSS_TYPE_L4_IPV6_TCP_EX = XDP_RSS_TYPE_L4_IPV6_TCP | XDP_RSS_L3_DYNHDR, 509 XDP_RSS_TYPE_L4_IPV6_UDP_EX = XDP_RSS_TYPE_L4_IPV6_UDP | XDP_RSS_L3_DYNHDR, 510 XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR, 511 }; 512 513 struct xdp_metadata_ops { 514 int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp); 515 int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash, 516 enum xdp_rss_hash_type *rss_type); 517 int (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto, 518 u16 *vlan_tci); 519 }; 520 521 #ifdef CONFIG_NET 522 u32 bpf_xdp_metadata_kfunc_id(int id); 523 bool bpf_dev_bound_kfunc_id(u32 btf_id); 524 void xdp_set_features_flag(struct net_device *dev, xdp_features_t val); 525 void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg); 526 void xdp_features_clear_redirect_target(struct net_device *dev); 527 #else 528 static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; } 529 static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; } 530 531 static inline void 532 xdp_set_features_flag(struct net_device *dev, xdp_features_t val) 533 { 534 } 535 536 static inline void 537 xdp_features_set_redirect_target(struct net_device *dev, bool support_sg) 538 { 539 } 540 541 static inline void 542 xdp_features_clear_redirect_target(struct net_device *dev) 543 { 544 } 545 #endif 546 547 static inline void xdp_clear_features_flag(struct net_device *dev) 548 { 549 xdp_set_features_flag(dev, 0); 550 } 551 552 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog, 553 struct xdp_buff *xdp) 554 { 555 /* Driver XDP hooks are invoked within a single NAPI poll cycle and thus 556 * under local_bh_disable(), which provides the needed RCU protection 557 * for accessing map entries. 558 */ 559 u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp)); 560 561 if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) { 562 if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev)) 563 act = xdp_master_redirect(xdp); 564 } 565 566 return act; 567 } 568 #endif /* __LINUX_NET_XDP_H__ */ 569