include/net/xdp.h

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