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