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 u32 frag_size; 68 } ____cacheline_aligned; /* perf critical, avoid false-sharing */ 69 70 struct xdp_txq_info { 71 struct net_device *dev; 72 }; 73 74 enum xdp_buff_flags { 75 XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */ 76 XDP_FLAGS_FRAGS_PF_MEMALLOC = BIT(1), /* xdp paged memory is under 77 * pressure 78 */ 79 }; 80 81 struct xdp_buff { 82 void *data; 83 void *data_end; 84 void *data_meta; 85 void *data_hard_start; 86 struct xdp_rxq_info *rxq; 87 struct xdp_txq_info *txq; 88 89 union { 90 struct { 91 /* frame size to deduce data_hard_end/tailroom */ 92 u32 frame_sz; 93 /* supported values defined in xdp_buff_flags */ 94 u32 flags; 95 }; 96 97 #ifdef __LITTLE_ENDIAN 98 /* Used to micro-optimize xdp_init_buff(), don't use directly */ 99 u64 frame_sz_flags_init; 100 #endif 101 }; 102 }; 103 104 static __always_inline bool xdp_buff_has_frags(const struct xdp_buff *xdp) 105 { 106 return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS); 107 } 108 109 static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp) 110 { 111 xdp->flags |= XDP_FLAGS_HAS_FRAGS; 112 } 113 114 static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp) 115 { 116 xdp->flags &= ~XDP_FLAGS_HAS_FRAGS; 117 } 118 119 static __always_inline bool 120 xdp_buff_is_frag_pfmemalloc(const struct xdp_buff *xdp) 121 { 122 return !!(xdp->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 123 } 124 125 static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp) 126 { 127 xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC; 128 } 129 130 static __always_inline void 131 xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq) 132 { 133 xdp->rxq = rxq; 134 135 #ifdef __LITTLE_ENDIAN 136 /* 137 * Force the compilers to initialize ::flags and assign ::frame_sz with 138 * one write on 64-bit LE architectures as they're often unable to do 139 * it themselves. 140 */ 141 xdp->frame_sz_flags_init = frame_sz; 142 #else 143 xdp->frame_sz = frame_sz; 144 xdp->flags = 0; 145 #endif 146 } 147 148 static __always_inline void 149 xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start, 150 int headroom, int data_len, const bool meta_valid) 151 { 152 unsigned char *data = hard_start + headroom; 153 154 xdp->data_hard_start = hard_start; 155 xdp->data = data; 156 xdp->data_end = data + data_len; 157 xdp->data_meta = meta_valid ? data : data + 1; 158 } 159 160 /* Reserve memory area at end-of data area. 161 * 162 * This macro reserves tailroom in the XDP buffer by limiting the 163 * XDP/BPF data access to data_hard_end. Notice same area (and size) 164 * is used for XDP_PASS, when constructing the SKB via build_skb(). 165 */ 166 #define xdp_data_hard_end(xdp) \ 167 ((xdp)->data_hard_start + (xdp)->frame_sz - \ 168 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 169 170 static inline struct skb_shared_info * 171 xdp_get_shared_info_from_buff(const struct xdp_buff *xdp) 172 { 173 return (struct skb_shared_info *)xdp_data_hard_end(xdp); 174 } 175 176 static __always_inline unsigned int 177 xdp_get_buff_len(const struct xdp_buff *xdp) 178 { 179 unsigned int len = xdp->data_end - xdp->data; 180 const struct skb_shared_info *sinfo; 181 182 if (likely(!xdp_buff_has_frags(xdp))) 183 goto out; 184 185 sinfo = xdp_get_shared_info_from_buff(xdp); 186 len += sinfo->xdp_frags_size; 187 out: 188 return len; 189 } 190 191 void xdp_return_frag(netmem_ref netmem, const struct xdp_buff *xdp); 192 193 /** 194 * __xdp_buff_add_frag - attach frag to &xdp_buff 195 * @xdp: XDP buffer to attach the frag to 196 * @netmem: network memory containing the frag 197 * @offset: offset at which the frag starts 198 * @size: size of the frag 199 * @truesize: total memory size occupied by the frag 200 * @try_coalesce: whether to try coalescing the frags (not valid for XSk) 201 * 202 * Attach frag to the XDP buffer. If it currently has no frags attached, 203 * initialize the related fields, otherwise check that the frag number 204 * didn't reach the limit of ``MAX_SKB_FRAGS``. If possible, try coalescing 205 * the frag with the previous one. 206 * The function doesn't check/update the pfmemalloc bit. Please use the 207 * non-underscored wrapper in drivers. 208 * 209 * Return: true on success, false if there's no space for the frag in 210 * the shared info struct. 211 */ 212 static inline bool __xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem, 213 u32 offset, u32 size, u32 truesize, 214 bool try_coalesce) 215 { 216 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 217 skb_frag_t *prev; 218 u32 nr_frags; 219 220 if (!xdp_buff_has_frags(xdp)) { 221 xdp_buff_set_frags_flag(xdp); 222 223 nr_frags = 0; 224 sinfo->xdp_frags_size = 0; 225 sinfo->xdp_frags_truesize = 0; 226 227 goto fill; 228 } 229 230 nr_frags = sinfo->nr_frags; 231 prev = &sinfo->frags[nr_frags - 1]; 232 233 if (try_coalesce && netmem == skb_frag_netmem(prev) && 234 offset == skb_frag_off(prev) + skb_frag_size(prev)) { 235 skb_frag_size_add(prev, size); 236 /* Guaranteed to only decrement the refcount */ 237 xdp_return_frag(netmem, xdp); 238 } else if (unlikely(nr_frags == MAX_SKB_FRAGS)) { 239 return false; 240 } else { 241 fill: 242 __skb_fill_netmem_desc_noacc(sinfo, nr_frags++, netmem, 243 offset, size); 244 } 245 246 sinfo->nr_frags = nr_frags; 247 sinfo->xdp_frags_size += size; 248 sinfo->xdp_frags_truesize += truesize; 249 250 return true; 251 } 252 253 /** 254 * xdp_buff_add_frag - attach frag to &xdp_buff 255 * @xdp: XDP buffer to attach the frag to 256 * @netmem: network memory containing the frag 257 * @offset: offset at which the frag starts 258 * @size: size of the frag 259 * @truesize: total memory size occupied by the frag 260 * 261 * Version of __xdp_buff_add_frag() which takes care of the pfmemalloc bit. 262 * 263 * Return: true on success, false if there's no space for the frag in 264 * the shared info struct. 265 */ 266 static inline bool xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem, 267 u32 offset, u32 size, u32 truesize) 268 { 269 if (!__xdp_buff_add_frag(xdp, netmem, offset, size, truesize, true)) 270 return false; 271 272 if (unlikely(netmem_is_pfmemalloc(netmem))) 273 xdp_buff_set_frag_pfmemalloc(xdp); 274 275 return true; 276 } 277 278 struct xdp_frame { 279 void *data; 280 u32 len; 281 u32 headroom; 282 u32 metasize; /* uses lower 8-bits */ 283 /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time, 284 * while mem_type is valid on remote CPU. 285 */ 286 enum xdp_mem_type mem_type:32; 287 struct net_device *dev_rx; /* used by cpumap */ 288 u32 frame_sz; 289 u32 flags; /* supported values defined in xdp_buff_flags */ 290 }; 291 292 static __always_inline bool xdp_frame_has_frags(const struct xdp_frame *frame) 293 { 294 return !!(frame->flags & XDP_FLAGS_HAS_FRAGS); 295 } 296 297 static __always_inline bool 298 xdp_frame_is_frag_pfmemalloc(const struct xdp_frame *frame) 299 { 300 return !!(frame->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 301 } 302 303 #define XDP_BULK_QUEUE_SIZE 16 304 struct xdp_frame_bulk { 305 int count; 306 netmem_ref q[XDP_BULK_QUEUE_SIZE]; 307 }; 308 309 static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq) 310 { 311 bq->count = 0; 312 } 313 314 static inline struct skb_shared_info * 315 xdp_get_shared_info_from_frame(const struct xdp_frame *frame) 316 { 317 void *data_hard_start = frame->data - frame->headroom - sizeof(*frame); 318 319 return (struct skb_shared_info *)(data_hard_start + frame->frame_sz - 320 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 321 } 322 323 struct xdp_cpumap_stats { 324 unsigned int redirect; 325 unsigned int pass; 326 unsigned int drop; 327 }; 328 329 /* Clear kernel pointers in xdp_frame */ 330 static inline void xdp_scrub_frame(struct xdp_frame *frame) 331 { 332 frame->data = NULL; 333 frame->dev_rx = NULL; 334 } 335 336 static inline void 337 xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags, 338 unsigned int size, unsigned int truesize, 339 bool pfmemalloc) 340 { 341 struct skb_shared_info *sinfo = skb_shinfo(skb); 342 343 sinfo->nr_frags = nr_frags; 344 /* 345 * ``destructor_arg`` is unionized with ``xdp_frags_{,true}size``, 346 * reset it after that these fields aren't used anymore. 347 */ 348 sinfo->destructor_arg = NULL; 349 350 skb->len += size; 351 skb->data_len += size; 352 skb->truesize += truesize; 353 skb->pfmemalloc |= pfmemalloc; 354 } 355 356 /* Avoids inlining WARN macro in fast-path */ 357 void xdp_warn(const char *msg, const char *func, const int line); 358 #define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__) 359 360 struct sk_buff *xdp_build_skb_from_buff(const struct xdp_buff *xdp); 361 struct sk_buff *xdp_build_skb_from_zc(struct xdp_buff *xdp); 362 struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp); 363 struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, 364 struct sk_buff *skb, 365 struct net_device *dev); 366 struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, 367 struct net_device *dev); 368 struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf); 369 370 static inline 371 void xdp_convert_frame_to_buff(const struct xdp_frame *frame, 372 struct xdp_buff *xdp) 373 { 374 xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame); 375 xdp->data = frame->data; 376 xdp->data_end = frame->data + frame->len; 377 xdp->data_meta = frame->data - frame->metasize; 378 xdp->frame_sz = frame->frame_sz; 379 xdp->flags = frame->flags; 380 } 381 382 static inline 383 int xdp_update_frame_from_buff(const struct xdp_buff *xdp, 384 struct xdp_frame *xdp_frame) 385 { 386 int metasize, headroom; 387 388 /* Assure headroom is available for storing info */ 389 headroom = xdp->data - xdp->data_hard_start; 390 metasize = xdp->data - xdp->data_meta; 391 metasize = metasize > 0 ? metasize : 0; 392 if (unlikely((headroom - metasize) < sizeof(*xdp_frame))) 393 return -ENOSPC; 394 395 /* Catch if driver didn't reserve tailroom for skb_shared_info */ 396 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 397 XDP_WARN("Driver BUG: missing reserved tailroom"); 398 return -ENOSPC; 399 } 400 401 xdp_frame->data = xdp->data; 402 xdp_frame->len = xdp->data_end - xdp->data; 403 xdp_frame->headroom = headroom - sizeof(*xdp_frame); 404 xdp_frame->metasize = metasize; 405 xdp_frame->frame_sz = xdp->frame_sz; 406 xdp_frame->flags = xdp->flags; 407 408 return 0; 409 } 410 411 /* Convert xdp_buff to xdp_frame */ 412 static inline 413 struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp) 414 { 415 struct xdp_frame *xdp_frame; 416 417 if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) 418 return xdp_convert_zc_to_xdp_frame(xdp); 419 420 /* Store info in top of packet */ 421 xdp_frame = xdp->data_hard_start; 422 if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0)) 423 return NULL; 424 425 /* rxq only valid until napi_schedule ends, convert to xdp_mem_type */ 426 xdp_frame->mem_type = xdp->rxq->mem.type; 427 428 return xdp_frame; 429 } 430 431 void __xdp_return(netmem_ref netmem, enum xdp_mem_type mem_type, 432 bool napi_direct, struct xdp_buff *xdp); 433 void xdp_return_frame(struct xdp_frame *xdpf); 434 void xdp_return_frame_rx_napi(struct xdp_frame *xdpf); 435 void xdp_return_buff(struct xdp_buff *xdp); 436 void xdp_return_frame_bulk(struct xdp_frame *xdpf, 437 struct xdp_frame_bulk *bq); 438 439 static inline void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) 440 { 441 if (unlikely(!bq->count)) 442 return; 443 444 page_pool_put_netmem_bulk(bq->q, bq->count); 445 bq->count = 0; 446 } 447 448 static __always_inline unsigned int 449 xdp_get_frame_len(const struct xdp_frame *xdpf) 450 { 451 const struct skb_shared_info *sinfo; 452 unsigned int len = xdpf->len; 453 454 if (likely(!xdp_frame_has_frags(xdpf))) 455 goto out; 456 457 sinfo = xdp_get_shared_info_from_frame(xdpf); 458 len += sinfo->xdp_frags_size; 459 out: 460 return len; 461 } 462 463 int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 464 struct net_device *dev, u32 queue_index, 465 unsigned int napi_id, u32 frag_size); 466 static inline int 467 xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 468 struct net_device *dev, u32 queue_index, 469 unsigned int napi_id) 470 { 471 return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0); 472 } 473 474 void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq); 475 void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq); 476 bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq); 477 int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, 478 enum xdp_mem_type type, void *allocator); 479 void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq); 480 int xdp_reg_mem_model(struct xdp_mem_info *mem, 481 enum xdp_mem_type type, void *allocator); 482 void xdp_unreg_mem_model(struct xdp_mem_info *mem); 483 int xdp_reg_page_pool(struct page_pool *pool); 484 void xdp_unreg_page_pool(const struct page_pool *pool); 485 void xdp_rxq_info_attach_page_pool(struct xdp_rxq_info *xdp_rxq, 486 const struct page_pool *pool); 487 488 /** 489 * xdp_rxq_info_attach_mem_model - attach registered mem info to RxQ info 490 * @xdp_rxq: XDP RxQ info to attach the memory info to 491 * @mem: already registered memory info 492 * 493 * If the driver registers its memory providers manually, it must use this 494 * function instead of xdp_rxq_info_reg_mem_model(). 495 */ 496 static inline void 497 xdp_rxq_info_attach_mem_model(struct xdp_rxq_info *xdp_rxq, 498 const struct xdp_mem_info *mem) 499 { 500 xdp_rxq->mem = *mem; 501 } 502 503 /** 504 * xdp_rxq_info_detach_mem_model - detach registered mem info from RxQ info 505 * @xdp_rxq: XDP RxQ info to detach the memory info from 506 * 507 * If the driver registers its memory providers manually and then attaches it 508 * via xdp_rxq_info_attach_mem_model(), it must call this function before 509 * xdp_rxq_info_unreg(). 510 */ 511 static inline void xdp_rxq_info_detach_mem_model(struct xdp_rxq_info *xdp_rxq) 512 { 513 xdp_rxq->mem = (struct xdp_mem_info){ }; 514 } 515 516 /* Drivers not supporting XDP metadata can use this helper, which 517 * rejects any room expansion for metadata as a result. 518 */ 519 static __always_inline void 520 xdp_set_data_meta_invalid(struct xdp_buff *xdp) 521 { 522 xdp->data_meta = xdp->data + 1; 523 } 524 525 static __always_inline bool 526 xdp_data_meta_unsupported(const struct xdp_buff *xdp) 527 { 528 return unlikely(xdp->data_meta > xdp->data); 529 } 530 531 static inline bool xdp_metalen_invalid(unsigned long metalen) 532 { 533 unsigned long meta_max; 534 535 meta_max = type_max(typeof_member(struct skb_shared_info, meta_len)); 536 BUILD_BUG_ON(!__builtin_constant_p(meta_max)); 537 538 return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max; 539 } 540 541 struct xdp_attachment_info { 542 struct bpf_prog *prog; 543 u32 flags; 544 }; 545 546 struct netdev_bpf; 547 void xdp_attachment_setup(struct xdp_attachment_info *info, 548 struct netdev_bpf *bpf); 549 550 #define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE 551 552 /* Define the relationship between xdp-rx-metadata kfunc and 553 * various other entities: 554 * - xdp_rx_metadata enum 555 * - netdev netlink enum (Documentation/netlink/specs/netdev.yaml) 556 * - kfunc name 557 * - xdp_metadata_ops field 558 */ 559 #define XDP_METADATA_KFUNC_xxx \ 560 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \ 561 NETDEV_XDP_RX_METADATA_TIMESTAMP, \ 562 bpf_xdp_metadata_rx_timestamp, \ 563 xmo_rx_timestamp) \ 564 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \ 565 NETDEV_XDP_RX_METADATA_HASH, \ 566 bpf_xdp_metadata_rx_hash, \ 567 xmo_rx_hash) \ 568 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \ 569 NETDEV_XDP_RX_METADATA_VLAN_TAG, \ 570 bpf_xdp_metadata_rx_vlan_tag, \ 571 xmo_rx_vlan_tag) \ 572 573 enum xdp_rx_metadata { 574 #define XDP_METADATA_KFUNC(name, _, __, ___) name, 575 XDP_METADATA_KFUNC_xxx 576 #undef XDP_METADATA_KFUNC 577 MAX_XDP_METADATA_KFUNC, 578 }; 579 580 enum xdp_rss_hash_type { 581 /* First part: Individual bits for L3/L4 types */ 582 XDP_RSS_L3_IPV4 = BIT(0), 583 XDP_RSS_L3_IPV6 = BIT(1), 584 585 /* The fixed (L3) IPv4 and IPv6 headers can both be followed by 586 * variable/dynamic headers, IPv4 called Options and IPv6 called 587 * Extension Headers. HW RSS type can contain this info. 588 */ 589 XDP_RSS_L3_DYNHDR = BIT(2), 590 591 /* When RSS hash covers L4 then drivers MUST set XDP_RSS_L4 bit in 592 * addition to the protocol specific bit. This ease interaction with 593 * SKBs and avoids reserving a fixed mask for future L4 protocol bits. 594 */ 595 XDP_RSS_L4 = BIT(3), /* L4 based hash, proto can be unknown */ 596 XDP_RSS_L4_TCP = BIT(4), 597 XDP_RSS_L4_UDP = BIT(5), 598 XDP_RSS_L4_SCTP = BIT(6), 599 XDP_RSS_L4_IPSEC = BIT(7), /* L4 based hash include IPSEC SPI */ 600 XDP_RSS_L4_ICMP = BIT(8), 601 602 /* Second part: RSS hash type combinations used for driver HW mapping */ 603 XDP_RSS_TYPE_NONE = 0, 604 XDP_RSS_TYPE_L2 = XDP_RSS_TYPE_NONE, 605 606 XDP_RSS_TYPE_L3_IPV4 = XDP_RSS_L3_IPV4, 607 XDP_RSS_TYPE_L3_IPV6 = XDP_RSS_L3_IPV6, 608 XDP_RSS_TYPE_L3_IPV4_OPT = XDP_RSS_L3_IPV4 | XDP_RSS_L3_DYNHDR, 609 XDP_RSS_TYPE_L3_IPV6_EX = XDP_RSS_L3_IPV6 | XDP_RSS_L3_DYNHDR, 610 611 XDP_RSS_TYPE_L4_ANY = XDP_RSS_L4, 612 XDP_RSS_TYPE_L4_IPV4_TCP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_TCP, 613 XDP_RSS_TYPE_L4_IPV4_UDP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP, 614 XDP_RSS_TYPE_L4_IPV4_SCTP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP, 615 XDP_RSS_TYPE_L4_IPV4_IPSEC = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC, 616 XDP_RSS_TYPE_L4_IPV4_ICMP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_ICMP, 617 618 XDP_RSS_TYPE_L4_IPV6_TCP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP, 619 XDP_RSS_TYPE_L4_IPV6_UDP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP, 620 XDP_RSS_TYPE_L4_IPV6_SCTP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP, 621 XDP_RSS_TYPE_L4_IPV6_IPSEC = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC, 622 XDP_RSS_TYPE_L4_IPV6_ICMP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_ICMP, 623 624 XDP_RSS_TYPE_L4_IPV6_TCP_EX = XDP_RSS_TYPE_L4_IPV6_TCP | XDP_RSS_L3_DYNHDR, 625 XDP_RSS_TYPE_L4_IPV6_UDP_EX = XDP_RSS_TYPE_L4_IPV6_UDP | XDP_RSS_L3_DYNHDR, 626 XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR, 627 }; 628 629 struct xdp_metadata_ops { 630 int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp); 631 int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash, 632 enum xdp_rss_hash_type *rss_type); 633 int (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto, 634 u16 *vlan_tci); 635 }; 636 637 #ifdef CONFIG_NET 638 u32 bpf_xdp_metadata_kfunc_id(int id); 639 bool bpf_dev_bound_kfunc_id(u32 btf_id); 640 void xdp_set_features_flag(struct net_device *dev, xdp_features_t val); 641 void xdp_set_features_flag_locked(struct net_device *dev, xdp_features_t val); 642 void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg); 643 void xdp_features_set_redirect_target_locked(struct net_device *dev, 644 bool support_sg); 645 void xdp_features_clear_redirect_target(struct net_device *dev); 646 void xdp_features_clear_redirect_target_locked(struct net_device *dev); 647 #else 648 static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; } 649 static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; } 650 651 static inline void 652 xdp_set_features_flag(struct net_device *dev, xdp_features_t val) 653 { 654 } 655 656 static inline void 657 xdp_features_set_redirect_target(struct net_device *dev, bool support_sg) 658 { 659 } 660 661 static inline void 662 xdp_features_clear_redirect_target(struct net_device *dev) 663 { 664 } 665 #endif 666 667 static inline void xdp_clear_features_flag(struct net_device *dev) 668 { 669 xdp_set_features_flag(dev, 0); 670 } 671 672 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog, 673 struct xdp_buff *xdp) 674 { 675 /* Driver XDP hooks are invoked within a single NAPI poll cycle and thus 676 * under local_bh_disable(), which provides the needed RCU protection 677 * for accessing map entries. 678 */ 679 u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp)); 680 681 if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) { 682 if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev)) 683 act = xdp_master_redirect(xdp); 684 } 685 686 return act; 687 } 688 #endif /* __LINUX_NET_XDP_H__ */ 689