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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
43enum 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
55struct xdp_mem_info {
56 u32 type; /* enum xdp_mem_type, but known size type */
57 u32 id;
58};
59
60struct page_pool;
61
62struct 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
70struct xdp_txq_info {
71 struct net_device *dev;
72};
73
74enum 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 /* frags have unreadable mem, this can't be true for real XDP packets,
80 * but drivers may use XDP helpers to construct Rx pkt state even when
81 * XDP program is not attached.
82 */
83 XDP_FLAGS_FRAGS_UNREADABLE = BIT(2),
84};
85
86struct xdp_buff {
87 void *data;
88 void *data_end;
89 void *data_meta;
90 void *data_hard_start;
91 struct xdp_rxq_info *rxq;
92 struct xdp_txq_info *txq;
93
94 union {
95 struct {
96 /* frame size to deduce data_hard_end/tailroom */
97 u32 frame_sz;
98 /* supported values defined in xdp_buff_flags */
99 u32 flags;
100 };
101
102#ifdef __LITTLE_ENDIAN
103 /* Used to micro-optimize xdp_init_buff(), don't use directly */
104 u64 frame_sz_flags_init;
105#endif
106 };
107};
108
109static __always_inline void xdp_reinit_buff(struct xdp_buff *xdp)
110{
111 xdp->flags = 0;
112}
113
114static __always_inline bool xdp_buff_has_frags(const struct xdp_buff *xdp)
115{
116 return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS);
117}
118
119static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp)
120{
121 xdp->flags |= XDP_FLAGS_HAS_FRAGS;
122}
123
124static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp)
125{
126 xdp->flags &= ~XDP_FLAGS_HAS_FRAGS;
127}
128
129static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp)
130{
131 xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC;
132}
133
134static __always_inline void xdp_buff_set_frag_unreadable(struct xdp_buff *xdp)
135{
136 xdp->flags |= XDP_FLAGS_FRAGS_UNREADABLE;
137}
138
139static __always_inline u32 xdp_buff_get_skb_flags(const struct xdp_buff *xdp)
140{
141 return xdp->flags;
142}
143
144static __always_inline void xdp_buff_clear_frag_pfmemalloc(struct xdp_buff *xdp)
145{
146 xdp->flags &= ~XDP_FLAGS_FRAGS_PF_MEMALLOC;
147}
148
149static __always_inline void
150xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
151{
152 xdp->rxq = rxq;
153
154#ifdef __LITTLE_ENDIAN
155 /*
156 * Force the compilers to initialize ::flags and assign ::frame_sz with
157 * one write on 64-bit LE architectures as they're often unable to do
158 * it themselves.
159 */
160 xdp->frame_sz_flags_init = frame_sz;
161#else
162 xdp->frame_sz = frame_sz;
163 xdp->flags = 0;
164#endif
165}
166
167static __always_inline void
168xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start,
169 int headroom, int data_len, const bool meta_valid)
170{
171 unsigned char *data = hard_start + headroom;
172
173 xdp->data_hard_start = hard_start;
174 xdp->data = data;
175 xdp->data_end = data + data_len;
176 xdp->data_meta = meta_valid ? data : data + 1;
177}
178
179/* Reserve memory area at end-of data area.
180 *
181 * This macro reserves tailroom in the XDP buffer by limiting the
182 * XDP/BPF data access to data_hard_end. Notice same area (and size)
183 * is used for XDP_PASS, when constructing the SKB via build_skb().
184 */
185#define xdp_data_hard_end(xdp) \
186 ((xdp)->data_hard_start + (xdp)->frame_sz - \
187 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
188
189static inline struct skb_shared_info *
190xdp_get_shared_info_from_buff(const struct xdp_buff *xdp)
191{
192 return (struct skb_shared_info *)xdp_data_hard_end(xdp);
193}
194
195static __always_inline unsigned int
196xdp_get_buff_len(const struct xdp_buff *xdp)
197{
198 unsigned int len = xdp->data_end - xdp->data;
199 const struct skb_shared_info *sinfo;
200
201 if (likely(!xdp_buff_has_frags(xdp)))
202 goto out;
203
204 sinfo = xdp_get_shared_info_from_buff(xdp);
205 len += sinfo->xdp_frags_size;
206out:
207 return len;
208}
209
210void xdp_return_frag(netmem_ref netmem, const struct xdp_buff *xdp);
211
212/**
213 * __xdp_buff_add_frag - attach frag to &xdp_buff
214 * @xdp: XDP buffer to attach the frag to
215 * @netmem: network memory containing the frag
216 * @offset: offset at which the frag starts
217 * @size: size of the frag
218 * @truesize: total memory size occupied by the frag
219 * @try_coalesce: whether to try coalescing the frags (not valid for XSk)
220 *
221 * Attach frag to the XDP buffer. If it currently has no frags attached,
222 * initialize the related fields, otherwise check that the frag number
223 * didn't reach the limit of ``MAX_SKB_FRAGS``. If possible, try coalescing
224 * the frag with the previous one.
225 * The function doesn't check/update the pfmemalloc bit. Please use the
226 * non-underscored wrapper in drivers.
227 *
228 * Return: true on success, false if there's no space for the frag in
229 * the shared info struct.
230 */
231static inline bool __xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem,
232 u32 offset, u32 size, u32 truesize,
233 bool try_coalesce)
234{
235 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
236 skb_frag_t *prev;
237 u32 nr_frags;
238
239 if (!xdp_buff_has_frags(xdp)) {
240 xdp_buff_set_frags_flag(xdp);
241
242 nr_frags = 0;
243 sinfo->xdp_frags_size = 0;
244 sinfo->xdp_frags_truesize = 0;
245
246 goto fill;
247 }
248
249 nr_frags = sinfo->nr_frags;
250 prev = &sinfo->frags[nr_frags - 1];
251
252 if (try_coalesce && netmem == skb_frag_netmem(prev) &&
253 offset == skb_frag_off(prev) + skb_frag_size(prev)) {
254 skb_frag_size_add(prev, size);
255 /* Guaranteed to only decrement the refcount */
256 xdp_return_frag(netmem, xdp);
257 } else if (unlikely(nr_frags == MAX_SKB_FRAGS)) {
258 return false;
259 } else {
260fill:
261 __skb_fill_netmem_desc_noacc(sinfo, nr_frags++, netmem,
262 offset, size);
263 }
264
265 sinfo->nr_frags = nr_frags;
266 sinfo->xdp_frags_size += size;
267 sinfo->xdp_frags_truesize += truesize;
268
269 return true;
270}
271
272/**
273 * xdp_buff_add_frag - attach frag to &xdp_buff
274 * @xdp: XDP buffer to attach the frag to
275 * @netmem: network memory containing the frag
276 * @offset: offset at which the frag starts
277 * @size: size of the frag
278 * @truesize: total memory size occupied by the frag
279 *
280 * Version of __xdp_buff_add_frag() which takes care of the pfmemalloc bit.
281 *
282 * Return: true on success, false if there's no space for the frag in
283 * the shared info struct.
284 */
285static inline bool xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem,
286 u32 offset, u32 size, u32 truesize)
287{
288 if (!__xdp_buff_add_frag(xdp, netmem, offset, size, truesize, true))
289 return false;
290
291 if (unlikely(netmem_is_pfmemalloc(netmem)))
292 xdp_buff_set_frag_pfmemalloc(xdp);
293 if (unlikely(netmem_is_net_iov(netmem)))
294 xdp_buff_set_frag_unreadable(xdp);
295
296 return true;
297}
298
299struct xdp_frame {
300 void *data;
301 u32 len;
302 u32 headroom;
303 u32 metasize; /* uses lower 8-bits */
304 /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time,
305 * while mem_type is valid on remote CPU.
306 */
307 enum xdp_mem_type mem_type:32;
308 struct net_device *dev_rx; /* used by cpumap */
309 u32 frame_sz;
310 u32 flags; /* supported values defined in xdp_buff_flags */
311};
312
313static __always_inline bool xdp_frame_has_frags(const struct xdp_frame *frame)
314{
315 return !!(frame->flags & XDP_FLAGS_HAS_FRAGS);
316}
317
318static __always_inline u32
319xdp_frame_get_skb_flags(const struct xdp_frame *frame)
320{
321 return frame->flags;
322}
323
324#define XDP_BULK_QUEUE_SIZE 16
325struct xdp_frame_bulk {
326 int count;
327 netmem_ref q[XDP_BULK_QUEUE_SIZE];
328};
329
330static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
331{
332 bq->count = 0;
333}
334
335static inline struct skb_shared_info *
336xdp_get_shared_info_from_frame(const struct xdp_frame *frame)
337{
338 void *data_hard_start = frame->data - frame->headroom - sizeof(*frame);
339
340 return (struct skb_shared_info *)(data_hard_start + frame->frame_sz -
341 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
342}
343
344struct xdp_cpumap_stats {
345 unsigned int redirect;
346 unsigned int pass;
347 unsigned int drop;
348};
349
350/* Clear kernel pointers in xdp_frame */
351static inline void xdp_scrub_frame(struct xdp_frame *frame)
352{
353 frame->data = NULL;
354 frame->dev_rx = NULL;
355}
356
357static inline void
358xdp_update_skb_frags_info(struct sk_buff *skb, u8 nr_frags,
359 unsigned int size, unsigned int truesize,
360 u32 xdp_flags)
361{
362 struct skb_shared_info *sinfo = skb_shinfo(skb);
363
364 sinfo->nr_frags = nr_frags;
365 /*
366 * ``destructor_arg`` is unionized with ``xdp_frags_{,true}size``,
367 * reset it after that these fields aren't used anymore.
368 */
369 sinfo->destructor_arg = NULL;
370
371 skb->len += size;
372 skb->data_len += size;
373 skb->truesize += truesize;
374 skb->pfmemalloc |= !!(xdp_flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
375 skb->unreadable |= !!(xdp_flags & XDP_FLAGS_FRAGS_UNREADABLE);
376}
377
378/* Avoids inlining WARN macro in fast-path */
379void xdp_warn(const char *msg, const char *func, const int line);
380#define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__)
381
382struct sk_buff *xdp_build_skb_from_buff(const struct xdp_buff *xdp);
383struct sk_buff *xdp_build_skb_from_zc(struct xdp_buff *xdp);
384struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp);
385struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
386 struct sk_buff *skb,
387 struct net_device *dev);
388struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf,
389 struct net_device *dev);
390struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf);
391
392static inline
393void xdp_convert_frame_to_buff(const struct xdp_frame *frame,
394 struct xdp_buff *xdp)
395{
396 xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame);
397 xdp->data = frame->data;
398 xdp->data_end = frame->data + frame->len;
399 xdp->data_meta = frame->data - frame->metasize;
400 xdp->frame_sz = frame->frame_sz;
401 xdp->flags = frame->flags;
402}
403
404static inline
405int xdp_update_frame_from_buff(const struct xdp_buff *xdp,
406 struct xdp_frame *xdp_frame)
407{
408 int metasize, headroom;
409
410 /* Assure headroom is available for storing info */
411 headroom = xdp->data - xdp->data_hard_start;
412 metasize = xdp->data - xdp->data_meta;
413 metasize = metasize > 0 ? metasize : 0;
414 if (unlikely((headroom - metasize) < sizeof(*xdp_frame)))
415 return -ENOSPC;
416
417 /* Catch if driver didn't reserve tailroom for skb_shared_info */
418 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
419 XDP_WARN("Driver BUG: missing reserved tailroom");
420 return -ENOSPC;
421 }
422
423 xdp_frame->data = xdp->data;
424 xdp_frame->len = xdp->data_end - xdp->data;
425 xdp_frame->headroom = headroom - sizeof(*xdp_frame);
426 xdp_frame->metasize = metasize;
427 xdp_frame->frame_sz = xdp->frame_sz;
428 xdp_frame->flags = xdp->flags;
429
430 return 0;
431}
432
433/* Convert xdp_buff to xdp_frame */
434static inline
435struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
436{
437 struct xdp_frame *xdp_frame;
438
439 if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
440 return xdp_convert_zc_to_xdp_frame(xdp);
441
442 /* Store info in top of packet */
443 xdp_frame = xdp->data_hard_start;
444 if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0))
445 return NULL;
446
447 /* rxq only valid until napi_schedule ends, convert to xdp_mem_type */
448 xdp_frame->mem_type = xdp->rxq->mem.type;
449
450 return xdp_frame;
451}
452
453void __xdp_return(netmem_ref netmem, enum xdp_mem_type mem_type,
454 bool napi_direct, struct xdp_buff *xdp);
455void xdp_return_frame(struct xdp_frame *xdpf);
456void xdp_return_frame_rx_napi(struct xdp_frame *xdpf);
457void xdp_return_buff(struct xdp_buff *xdp);
458void xdp_return_frame_bulk(struct xdp_frame *xdpf,
459 struct xdp_frame_bulk *bq);
460
461static inline void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
462{
463 if (unlikely(!bq->count))
464 return;
465
466 page_pool_put_netmem_bulk(bq->q, bq->count);
467 bq->count = 0;
468}
469
470static __always_inline unsigned int
471xdp_get_frame_len(const struct xdp_frame *xdpf)
472{
473 const struct skb_shared_info *sinfo;
474 unsigned int len = xdpf->len;
475
476 if (likely(!xdp_frame_has_frags(xdpf)))
477 goto out;
478
479 sinfo = xdp_get_shared_info_from_frame(xdpf);
480 len += sinfo->xdp_frags_size;
481out:
482 return len;
483}
484
485int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
486 struct net_device *dev, u32 queue_index,
487 unsigned int napi_id, u32 frag_size);
488static inline int
489xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
490 struct net_device *dev, u32 queue_index,
491 unsigned int napi_id)
492{
493 return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0);
494}
495
496void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq);
497void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq);
498bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
499int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
500 enum xdp_mem_type type, void *allocator);
501void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq);
502int xdp_reg_mem_model(struct xdp_mem_info *mem,
503 enum xdp_mem_type type, void *allocator);
504void xdp_unreg_mem_model(struct xdp_mem_info *mem);
505int xdp_reg_page_pool(struct page_pool *pool);
506void xdp_unreg_page_pool(const struct page_pool *pool);
507void xdp_rxq_info_attach_page_pool(struct xdp_rxq_info *xdp_rxq,
508 const struct page_pool *pool);
509
510/**
511 * xdp_rxq_info_attach_mem_model - attach registered mem info to RxQ info
512 * @xdp_rxq: XDP RxQ info to attach the memory info to
513 * @mem: already registered memory info
514 *
515 * If the driver registers its memory providers manually, it must use this
516 * function instead of xdp_rxq_info_reg_mem_model().
517 */
518static inline void
519xdp_rxq_info_attach_mem_model(struct xdp_rxq_info *xdp_rxq,
520 const struct xdp_mem_info *mem)
521{
522 xdp_rxq->mem = *mem;
523}
524
525/**
526 * xdp_rxq_info_detach_mem_model - detach registered mem info from RxQ info
527 * @xdp_rxq: XDP RxQ info to detach the memory info from
528 *
529 * If the driver registers its memory providers manually and then attaches it
530 * via xdp_rxq_info_attach_mem_model(), it must call this function before
531 * xdp_rxq_info_unreg().
532 */
533static inline void xdp_rxq_info_detach_mem_model(struct xdp_rxq_info *xdp_rxq)
534{
535 xdp_rxq->mem = (struct xdp_mem_info){ };
536}
537
538/* Drivers not supporting XDP metadata can use this helper, which
539 * rejects any room expansion for metadata as a result.
540 */
541static __always_inline void
542xdp_set_data_meta_invalid(struct xdp_buff *xdp)
543{
544 xdp->data_meta = xdp->data + 1;
545}
546
547static __always_inline bool
548xdp_data_meta_unsupported(const struct xdp_buff *xdp)
549{
550 return unlikely(xdp->data_meta > xdp->data);
551}
552
553static inline bool xdp_metalen_invalid(unsigned long metalen)
554{
555 unsigned long meta_max;
556
557 meta_max = type_max(typeof_member(struct skb_shared_info, meta_len));
558 BUILD_BUG_ON(!__builtin_constant_p(meta_max));
559
560 return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max;
561}
562
563struct xdp_attachment_info {
564 struct bpf_prog *prog;
565 u32 flags;
566};
567
568struct netdev_bpf;
569void xdp_attachment_setup(struct xdp_attachment_info *info,
570 struct netdev_bpf *bpf);
571
572#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE
573
574/* Define the relationship between xdp-rx-metadata kfunc and
575 * various other entities:
576 * - xdp_rx_metadata enum
577 * - netdev netlink enum (Documentation/netlink/specs/netdev.yaml)
578 * - kfunc name
579 * - xdp_metadata_ops field
580 */
581#define XDP_METADATA_KFUNC_xxx \
582 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
583 NETDEV_XDP_RX_METADATA_TIMESTAMP, \
584 bpf_xdp_metadata_rx_timestamp, \
585 xmo_rx_timestamp) \
586 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
587 NETDEV_XDP_RX_METADATA_HASH, \
588 bpf_xdp_metadata_rx_hash, \
589 xmo_rx_hash) \
590 XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
591 NETDEV_XDP_RX_METADATA_VLAN_TAG, \
592 bpf_xdp_metadata_rx_vlan_tag, \
593 xmo_rx_vlan_tag) \
594
595enum xdp_rx_metadata {
596#define XDP_METADATA_KFUNC(name, _, __, ___) name,
597XDP_METADATA_KFUNC_xxx
598#undef XDP_METADATA_KFUNC
599MAX_XDP_METADATA_KFUNC,
600};
601
602enum xdp_rss_hash_type {
603 /* First part: Individual bits for L3/L4 types */
604 XDP_RSS_L3_IPV4 = BIT(0),
605 XDP_RSS_L3_IPV6 = BIT(1),
606
607 /* The fixed (L3) IPv4 and IPv6 headers can both be followed by
608 * variable/dynamic headers, IPv4 called Options and IPv6 called
609 * Extension Headers. HW RSS type can contain this info.
610 */
611 XDP_RSS_L3_DYNHDR = BIT(2),
612
613 /* When RSS hash covers L4 then drivers MUST set XDP_RSS_L4 bit in
614 * addition to the protocol specific bit. This ease interaction with
615 * SKBs and avoids reserving a fixed mask for future L4 protocol bits.
616 */
617 XDP_RSS_L4 = BIT(3), /* L4 based hash, proto can be unknown */
618 XDP_RSS_L4_TCP = BIT(4),
619 XDP_RSS_L4_UDP = BIT(5),
620 XDP_RSS_L4_SCTP = BIT(6),
621 XDP_RSS_L4_IPSEC = BIT(7), /* L4 based hash include IPSEC SPI */
622 XDP_RSS_L4_ICMP = BIT(8),
623
624 /* Second part: RSS hash type combinations used for driver HW mapping */
625 XDP_RSS_TYPE_NONE = 0,
626 XDP_RSS_TYPE_L2 = XDP_RSS_TYPE_NONE,
627
628 XDP_RSS_TYPE_L3_IPV4 = XDP_RSS_L3_IPV4,
629 XDP_RSS_TYPE_L3_IPV6 = XDP_RSS_L3_IPV6,
630 XDP_RSS_TYPE_L3_IPV4_OPT = XDP_RSS_L3_IPV4 | XDP_RSS_L3_DYNHDR,
631 XDP_RSS_TYPE_L3_IPV6_EX = XDP_RSS_L3_IPV6 | XDP_RSS_L3_DYNHDR,
632
633 XDP_RSS_TYPE_L4_ANY = XDP_RSS_L4,
634 XDP_RSS_TYPE_L4_IPV4_TCP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
635 XDP_RSS_TYPE_L4_IPV4_UDP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
636 XDP_RSS_TYPE_L4_IPV4_SCTP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
637 XDP_RSS_TYPE_L4_IPV4_IPSEC = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
638 XDP_RSS_TYPE_L4_IPV4_ICMP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_ICMP,
639
640 XDP_RSS_TYPE_L4_IPV6_TCP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
641 XDP_RSS_TYPE_L4_IPV6_UDP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
642 XDP_RSS_TYPE_L4_IPV6_SCTP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
643 XDP_RSS_TYPE_L4_IPV6_IPSEC = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
644 XDP_RSS_TYPE_L4_IPV6_ICMP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_ICMP,
645
646 XDP_RSS_TYPE_L4_IPV6_TCP_EX = XDP_RSS_TYPE_L4_IPV6_TCP | XDP_RSS_L3_DYNHDR,
647 XDP_RSS_TYPE_L4_IPV6_UDP_EX = XDP_RSS_TYPE_L4_IPV6_UDP | XDP_RSS_L3_DYNHDR,
648 XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
649};
650
651struct xdp_metadata_ops {
652 int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
653 int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash,
654 enum xdp_rss_hash_type *rss_type);
655 int (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto,
656 u16 *vlan_tci);
657};
658
659#ifdef CONFIG_NET
660u32 bpf_xdp_metadata_kfunc_id(int id);
661bool bpf_dev_bound_kfunc_id(u32 btf_id);
662void xdp_set_features_flag(struct net_device *dev, xdp_features_t val);
663void xdp_set_features_flag_locked(struct net_device *dev, xdp_features_t val);
664void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg);
665void xdp_features_set_redirect_target_locked(struct net_device *dev,
666 bool support_sg);
667void xdp_features_clear_redirect_target(struct net_device *dev);
668void xdp_features_clear_redirect_target_locked(struct net_device *dev);
669#else
670static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; }
671static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; }
672
673static inline void
674xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
675{
676}
677
678static inline void
679xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
680{
681}
682
683static inline void
684xdp_features_clear_redirect_target(struct net_device *dev)
685{
686}
687#endif
688
689static inline void xdp_clear_features_flag(struct net_device *dev)
690{
691 xdp_set_features_flag(dev, 0);
692}
693
694static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
695 struct xdp_buff *xdp)
696{
697 /* Driver XDP hooks are invoked within a single NAPI poll cycle and thus
698 * under local_bh_disable(), which provides the needed RCU protection
699 * for accessing map entries.
700 */
701 u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
702
703 if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) {
704 if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev))
705 act = xdp_master_redirect(xdp);
706 }
707
708 return act;
709}
710#endif /* __LINUX_NET_XDP_H__ */