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1// SPDX-License-Identifier: GPL-2.0-only
2/* net/core/xdp.c
3 *
4 * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
5 */
6#include <linux/bpf.h>
7#include <linux/btf.h>
8#include <linux/btf_ids.h>
9#include <linux/filter.h>
10#include <linux/types.h>
11#include <linux/mm.h>
12#include <linux/netdevice.h>
13#include <linux/slab.h>
14#include <linux/idr.h>
15#include <linux/rhashtable.h>
16#include <linux/bug.h>
17#include <net/page_pool/helpers.h>
18
19#include <net/xdp.h>
20#include <net/xdp_priv.h> /* struct xdp_mem_allocator */
21#include <trace/events/xdp.h>
22#include <net/xdp_sock_drv.h>
23
24#define REG_STATE_NEW 0x0
25#define REG_STATE_REGISTERED 0x1
26#define REG_STATE_UNREGISTERED 0x2
27#define REG_STATE_UNUSED 0x3
28
29static DEFINE_IDA(mem_id_pool);
30static DEFINE_MUTEX(mem_id_lock);
31#define MEM_ID_MAX 0xFFFE
32#define MEM_ID_MIN 1
33static int mem_id_next = MEM_ID_MIN;
34
35static bool mem_id_init; /* false */
36static struct rhashtable *mem_id_ht;
37
38static u32 xdp_mem_id_hashfn(const void *data, u32 len, u32 seed)
39{
40 const u32 *k = data;
41 const u32 key = *k;
42
43 BUILD_BUG_ON(sizeof_field(struct xdp_mem_allocator, mem.id)
44 != sizeof(u32));
45
46 /* Use cyclic increasing ID as direct hash key */
47 return key;
48}
49
50static int xdp_mem_id_cmp(struct rhashtable_compare_arg *arg,
51 const void *ptr)
52{
53 const struct xdp_mem_allocator *xa = ptr;
54 u32 mem_id = *(u32 *)arg->key;
55
56 return xa->mem.id != mem_id;
57}
58
59static const struct rhashtable_params mem_id_rht_params = {
60 .nelem_hint = 64,
61 .head_offset = offsetof(struct xdp_mem_allocator, node),
62 .key_offset = offsetof(struct xdp_mem_allocator, mem.id),
63 .key_len = sizeof_field(struct xdp_mem_allocator, mem.id),
64 .max_size = MEM_ID_MAX,
65 .min_size = 8,
66 .automatic_shrinking = true,
67 .hashfn = xdp_mem_id_hashfn,
68 .obj_cmpfn = xdp_mem_id_cmp,
69};
70
71static void __xdp_mem_allocator_rcu_free(struct rcu_head *rcu)
72{
73 struct xdp_mem_allocator *xa;
74
75 xa = container_of(rcu, struct xdp_mem_allocator, rcu);
76
77 /* Allow this ID to be reused */
78 ida_simple_remove(&mem_id_pool, xa->mem.id);
79
80 kfree(xa);
81}
82
83static void mem_xa_remove(struct xdp_mem_allocator *xa)
84{
85 trace_mem_disconnect(xa);
86
87 if (!rhashtable_remove_fast(mem_id_ht, &xa->node, mem_id_rht_params))
88 call_rcu(&xa->rcu, __xdp_mem_allocator_rcu_free);
89}
90
91static void mem_allocator_disconnect(void *allocator)
92{
93 struct xdp_mem_allocator *xa;
94 struct rhashtable_iter iter;
95
96 mutex_lock(&mem_id_lock);
97
98 rhashtable_walk_enter(mem_id_ht, &iter);
99 do {
100 rhashtable_walk_start(&iter);
101
102 while ((xa = rhashtable_walk_next(&iter)) && !IS_ERR(xa)) {
103 if (xa->allocator == allocator)
104 mem_xa_remove(xa);
105 }
106
107 rhashtable_walk_stop(&iter);
108
109 } while (xa == ERR_PTR(-EAGAIN));
110 rhashtable_walk_exit(&iter);
111
112 mutex_unlock(&mem_id_lock);
113}
114
115void xdp_unreg_mem_model(struct xdp_mem_info *mem)
116{
117 struct xdp_mem_allocator *xa;
118 int type = mem->type;
119 int id = mem->id;
120
121 /* Reset mem info to defaults */
122 mem->id = 0;
123 mem->type = 0;
124
125 if (id == 0)
126 return;
127
128 if (type == MEM_TYPE_PAGE_POOL) {
129 rcu_read_lock();
130 xa = rhashtable_lookup(mem_id_ht, &id, mem_id_rht_params);
131 page_pool_destroy(xa->page_pool);
132 rcu_read_unlock();
133 }
134}
135EXPORT_SYMBOL_GPL(xdp_unreg_mem_model);
136
137void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq)
138{
139 if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
140 WARN(1, "Missing register, driver bug");
141 return;
142 }
143
144 xdp_unreg_mem_model(&xdp_rxq->mem);
145}
146EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg_mem_model);
147
148void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq)
149{
150 /* Simplify driver cleanup code paths, allow unreg "unused" */
151 if (xdp_rxq->reg_state == REG_STATE_UNUSED)
152 return;
153
154 xdp_rxq_info_unreg_mem_model(xdp_rxq);
155
156 xdp_rxq->reg_state = REG_STATE_UNREGISTERED;
157 xdp_rxq->dev = NULL;
158}
159EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg);
160
161static void xdp_rxq_info_init(struct xdp_rxq_info *xdp_rxq)
162{
163 memset(xdp_rxq, 0, sizeof(*xdp_rxq));
164}
165
166/* Returns 0 on success, negative on failure */
167int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
168 struct net_device *dev, u32 queue_index,
169 unsigned int napi_id, u32 frag_size)
170{
171 if (!dev) {
172 WARN(1, "Missing net_device from driver");
173 return -ENODEV;
174 }
175
176 if (xdp_rxq->reg_state == REG_STATE_UNUSED) {
177 WARN(1, "Driver promised not to register this");
178 return -EINVAL;
179 }
180
181 if (xdp_rxq->reg_state == REG_STATE_REGISTERED) {
182 WARN(1, "Missing unregister, handled but fix driver");
183 xdp_rxq_info_unreg(xdp_rxq);
184 }
185
186 /* State either UNREGISTERED or NEW */
187 xdp_rxq_info_init(xdp_rxq);
188 xdp_rxq->dev = dev;
189 xdp_rxq->queue_index = queue_index;
190 xdp_rxq->napi_id = napi_id;
191 xdp_rxq->frag_size = frag_size;
192
193 xdp_rxq->reg_state = REG_STATE_REGISTERED;
194 return 0;
195}
196EXPORT_SYMBOL_GPL(__xdp_rxq_info_reg);
197
198void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq)
199{
200 xdp_rxq->reg_state = REG_STATE_UNUSED;
201}
202EXPORT_SYMBOL_GPL(xdp_rxq_info_unused);
203
204bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq)
205{
206 return (xdp_rxq->reg_state == REG_STATE_REGISTERED);
207}
208EXPORT_SYMBOL_GPL(xdp_rxq_info_is_reg);
209
210static int __mem_id_init_hash_table(void)
211{
212 struct rhashtable *rht;
213 int ret;
214
215 if (unlikely(mem_id_init))
216 return 0;
217
218 rht = kzalloc(sizeof(*rht), GFP_KERNEL);
219 if (!rht)
220 return -ENOMEM;
221
222 ret = rhashtable_init(rht, &mem_id_rht_params);
223 if (ret < 0) {
224 kfree(rht);
225 return ret;
226 }
227 mem_id_ht = rht;
228 smp_mb(); /* mutex lock should provide enough pairing */
229 mem_id_init = true;
230
231 return 0;
232}
233
234/* Allocate a cyclic ID that maps to allocator pointer.
235 * See: https://www.kernel.org/doc/html/latest/core-api/idr.html
236 *
237 * Caller must lock mem_id_lock.
238 */
239static int __mem_id_cyclic_get(gfp_t gfp)
240{
241 int retries = 1;
242 int id;
243
244again:
245 id = ida_simple_get(&mem_id_pool, mem_id_next, MEM_ID_MAX, gfp);
246 if (id < 0) {
247 if (id == -ENOSPC) {
248 /* Cyclic allocator, reset next id */
249 if (retries--) {
250 mem_id_next = MEM_ID_MIN;
251 goto again;
252 }
253 }
254 return id; /* errno */
255 }
256 mem_id_next = id + 1;
257
258 return id;
259}
260
261static bool __is_supported_mem_type(enum xdp_mem_type type)
262{
263 if (type == MEM_TYPE_PAGE_POOL)
264 return is_page_pool_compiled_in();
265
266 if (type >= MEM_TYPE_MAX)
267 return false;
268
269 return true;
270}
271
272static struct xdp_mem_allocator *__xdp_reg_mem_model(struct xdp_mem_info *mem,
273 enum xdp_mem_type type,
274 void *allocator)
275{
276 struct xdp_mem_allocator *xdp_alloc;
277 gfp_t gfp = GFP_KERNEL;
278 int id, errno, ret;
279 void *ptr;
280
281 if (!__is_supported_mem_type(type))
282 return ERR_PTR(-EOPNOTSUPP);
283
284 mem->type = type;
285
286 if (!allocator) {
287 if (type == MEM_TYPE_PAGE_POOL)
288 return ERR_PTR(-EINVAL); /* Setup time check page_pool req */
289 return NULL;
290 }
291
292 /* Delay init of rhashtable to save memory if feature isn't used */
293 if (!mem_id_init) {
294 mutex_lock(&mem_id_lock);
295 ret = __mem_id_init_hash_table();
296 mutex_unlock(&mem_id_lock);
297 if (ret < 0) {
298 WARN_ON(1);
299 return ERR_PTR(ret);
300 }
301 }
302
303 xdp_alloc = kzalloc(sizeof(*xdp_alloc), gfp);
304 if (!xdp_alloc)
305 return ERR_PTR(-ENOMEM);
306
307 mutex_lock(&mem_id_lock);
308 id = __mem_id_cyclic_get(gfp);
309 if (id < 0) {
310 errno = id;
311 goto err;
312 }
313 mem->id = id;
314 xdp_alloc->mem = *mem;
315 xdp_alloc->allocator = allocator;
316
317 /* Insert allocator into ID lookup table */
318 ptr = rhashtable_insert_slow(mem_id_ht, &id, &xdp_alloc->node);
319 if (IS_ERR(ptr)) {
320 ida_simple_remove(&mem_id_pool, mem->id);
321 mem->id = 0;
322 errno = PTR_ERR(ptr);
323 goto err;
324 }
325
326 if (type == MEM_TYPE_PAGE_POOL)
327 page_pool_use_xdp_mem(allocator, mem_allocator_disconnect, mem);
328
329 mutex_unlock(&mem_id_lock);
330
331 return xdp_alloc;
332err:
333 mutex_unlock(&mem_id_lock);
334 kfree(xdp_alloc);
335 return ERR_PTR(errno);
336}
337
338int xdp_reg_mem_model(struct xdp_mem_info *mem,
339 enum xdp_mem_type type, void *allocator)
340{
341 struct xdp_mem_allocator *xdp_alloc;
342
343 xdp_alloc = __xdp_reg_mem_model(mem, type, allocator);
344 if (IS_ERR(xdp_alloc))
345 return PTR_ERR(xdp_alloc);
346 return 0;
347}
348EXPORT_SYMBOL_GPL(xdp_reg_mem_model);
349
350int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
351 enum xdp_mem_type type, void *allocator)
352{
353 struct xdp_mem_allocator *xdp_alloc;
354
355 if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
356 WARN(1, "Missing register, driver bug");
357 return -EFAULT;
358 }
359
360 xdp_alloc = __xdp_reg_mem_model(&xdp_rxq->mem, type, allocator);
361 if (IS_ERR(xdp_alloc))
362 return PTR_ERR(xdp_alloc);
363
364 if (trace_mem_connect_enabled() && xdp_alloc)
365 trace_mem_connect(xdp_alloc, xdp_rxq);
366 return 0;
367}
368
369EXPORT_SYMBOL_GPL(xdp_rxq_info_reg_mem_model);
370
371/* XDP RX runs under NAPI protection, and in different delivery error
372 * scenarios (e.g. queue full), it is possible to return the xdp_frame
373 * while still leveraging this protection. The @napi_direct boolean
374 * is used for those calls sites. Thus, allowing for faster recycling
375 * of xdp_frames/pages in those cases.
376 */
377void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
378 struct xdp_buff *xdp)
379{
380 struct page *page;
381
382 switch (mem->type) {
383 case MEM_TYPE_PAGE_POOL:
384 page = virt_to_head_page(data);
385 if (napi_direct && xdp_return_frame_no_direct())
386 napi_direct = false;
387 /* No need to check ((page->pp_magic & ~0x3UL) == PP_SIGNATURE)
388 * as mem->type knows this a page_pool page
389 */
390 page_pool_put_full_page(page->pp, page, napi_direct);
391 break;
392 case MEM_TYPE_PAGE_SHARED:
393 page_frag_free(data);
394 break;
395 case MEM_TYPE_PAGE_ORDER0:
396 page = virt_to_page(data); /* Assumes order0 page*/
397 put_page(page);
398 break;
399 case MEM_TYPE_XSK_BUFF_POOL:
400 /* NB! Only valid from an xdp_buff! */
401 xsk_buff_free(xdp);
402 break;
403 default:
404 /* Not possible, checked in xdp_rxq_info_reg_mem_model() */
405 WARN(1, "Incorrect XDP memory type (%d) usage", mem->type);
406 break;
407 }
408}
409
410void xdp_return_frame(struct xdp_frame *xdpf)
411{
412 struct skb_shared_info *sinfo;
413 int i;
414
415 if (likely(!xdp_frame_has_frags(xdpf)))
416 goto out;
417
418 sinfo = xdp_get_shared_info_from_frame(xdpf);
419 for (i = 0; i < sinfo->nr_frags; i++) {
420 struct page *page = skb_frag_page(&sinfo->frags[i]);
421
422 __xdp_return(page_address(page), &xdpf->mem, false, NULL);
423 }
424out:
425 __xdp_return(xdpf->data, &xdpf->mem, false, NULL);
426}
427EXPORT_SYMBOL_GPL(xdp_return_frame);
428
429void xdp_return_frame_rx_napi(struct xdp_frame *xdpf)
430{
431 struct skb_shared_info *sinfo;
432 int i;
433
434 if (likely(!xdp_frame_has_frags(xdpf)))
435 goto out;
436
437 sinfo = xdp_get_shared_info_from_frame(xdpf);
438 for (i = 0; i < sinfo->nr_frags; i++) {
439 struct page *page = skb_frag_page(&sinfo->frags[i]);
440
441 __xdp_return(page_address(page), &xdpf->mem, true, NULL);
442 }
443out:
444 __xdp_return(xdpf->data, &xdpf->mem, true, NULL);
445}
446EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi);
447
448/* XDP bulk APIs introduce a defer/flush mechanism to return
449 * pages belonging to the same xdp_mem_allocator object
450 * (identified via the mem.id field) in bulk to optimize
451 * I-cache and D-cache.
452 * The bulk queue size is set to 16 to be aligned to how
453 * XDP_REDIRECT bulking works. The bulk is flushed when
454 * it is full or when mem.id changes.
455 * xdp_frame_bulk is usually stored/allocated on the function
456 * call-stack to avoid locking penalties.
457 */
458void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
459{
460 struct xdp_mem_allocator *xa = bq->xa;
461
462 if (unlikely(!xa || !bq->count))
463 return;
464
465 page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count);
466 /* bq->xa is not cleared to save lookup, if mem.id same in next bulk */
467 bq->count = 0;
468}
469EXPORT_SYMBOL_GPL(xdp_flush_frame_bulk);
470
471/* Must be called with rcu_read_lock held */
472void xdp_return_frame_bulk(struct xdp_frame *xdpf,
473 struct xdp_frame_bulk *bq)
474{
475 struct xdp_mem_info *mem = &xdpf->mem;
476 struct xdp_mem_allocator *xa;
477
478 if (mem->type != MEM_TYPE_PAGE_POOL) {
479 xdp_return_frame(xdpf);
480 return;
481 }
482
483 xa = bq->xa;
484 if (unlikely(!xa)) {
485 xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
486 bq->count = 0;
487 bq->xa = xa;
488 }
489
490 if (bq->count == XDP_BULK_QUEUE_SIZE)
491 xdp_flush_frame_bulk(bq);
492
493 if (unlikely(mem->id != xa->mem.id)) {
494 xdp_flush_frame_bulk(bq);
495 bq->xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
496 }
497
498 if (unlikely(xdp_frame_has_frags(xdpf))) {
499 struct skb_shared_info *sinfo;
500 int i;
501
502 sinfo = xdp_get_shared_info_from_frame(xdpf);
503 for (i = 0; i < sinfo->nr_frags; i++) {
504 skb_frag_t *frag = &sinfo->frags[i];
505
506 bq->q[bq->count++] = skb_frag_address(frag);
507 if (bq->count == XDP_BULK_QUEUE_SIZE)
508 xdp_flush_frame_bulk(bq);
509 }
510 }
511 bq->q[bq->count++] = xdpf->data;
512}
513EXPORT_SYMBOL_GPL(xdp_return_frame_bulk);
514
515void xdp_return_buff(struct xdp_buff *xdp)
516{
517 struct skb_shared_info *sinfo;
518 int i;
519
520 if (likely(!xdp_buff_has_frags(xdp)))
521 goto out;
522
523 sinfo = xdp_get_shared_info_from_buff(xdp);
524 for (i = 0; i < sinfo->nr_frags; i++) {
525 struct page *page = skb_frag_page(&sinfo->frags[i]);
526
527 __xdp_return(page_address(page), &xdp->rxq->mem, true, xdp);
528 }
529out:
530 __xdp_return(xdp->data, &xdp->rxq->mem, true, xdp);
531}
532EXPORT_SYMBOL_GPL(xdp_return_buff);
533
534void xdp_attachment_setup(struct xdp_attachment_info *info,
535 struct netdev_bpf *bpf)
536{
537 if (info->prog)
538 bpf_prog_put(info->prog);
539 info->prog = bpf->prog;
540 info->flags = bpf->flags;
541}
542EXPORT_SYMBOL_GPL(xdp_attachment_setup);
543
544struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp)
545{
546 unsigned int metasize, totsize;
547 void *addr, *data_to_copy;
548 struct xdp_frame *xdpf;
549 struct page *page;
550
551 /* Clone into a MEM_TYPE_PAGE_ORDER0 xdp_frame. */
552 metasize = xdp_data_meta_unsupported(xdp) ? 0 :
553 xdp->data - xdp->data_meta;
554 totsize = xdp->data_end - xdp->data + metasize;
555
556 if (sizeof(*xdpf) + totsize > PAGE_SIZE)
557 return NULL;
558
559 page = dev_alloc_page();
560 if (!page)
561 return NULL;
562
563 addr = page_to_virt(page);
564 xdpf = addr;
565 memset(xdpf, 0, sizeof(*xdpf));
566
567 addr += sizeof(*xdpf);
568 data_to_copy = metasize ? xdp->data_meta : xdp->data;
569 memcpy(addr, data_to_copy, totsize);
570
571 xdpf->data = addr + metasize;
572 xdpf->len = totsize - metasize;
573 xdpf->headroom = 0;
574 xdpf->metasize = metasize;
575 xdpf->frame_sz = PAGE_SIZE;
576 xdpf->mem.type = MEM_TYPE_PAGE_ORDER0;
577
578 xsk_buff_free(xdp);
579 return xdpf;
580}
581EXPORT_SYMBOL_GPL(xdp_convert_zc_to_xdp_frame);
582
583/* Used by XDP_WARN macro, to avoid inlining WARN() in fast-path */
584void xdp_warn(const char *msg, const char *func, const int line)
585{
586 WARN(1, "XDP_WARN: %s(line:%d): %s\n", func, line, msg);
587};
588EXPORT_SYMBOL_GPL(xdp_warn);
589
590int xdp_alloc_skb_bulk(void **skbs, int n_skb, gfp_t gfp)
591{
592 n_skb = kmem_cache_alloc_bulk(skbuff_cache, gfp, n_skb, skbs);
593 if (unlikely(!n_skb))
594 return -ENOMEM;
595
596 return 0;
597}
598EXPORT_SYMBOL_GPL(xdp_alloc_skb_bulk);
599
600struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
601 struct sk_buff *skb,
602 struct net_device *dev)
603{
604 struct skb_shared_info *sinfo = xdp_get_shared_info_from_frame(xdpf);
605 unsigned int headroom, frame_size;
606 void *hard_start;
607 u8 nr_frags;
608
609 /* xdp frags frame */
610 if (unlikely(xdp_frame_has_frags(xdpf)))
611 nr_frags = sinfo->nr_frags;
612
613 /* Part of headroom was reserved to xdpf */
614 headroom = sizeof(*xdpf) + xdpf->headroom;
615
616 /* Memory size backing xdp_frame data already have reserved
617 * room for build_skb to place skb_shared_info in tailroom.
618 */
619 frame_size = xdpf->frame_sz;
620
621 hard_start = xdpf->data - headroom;
622 skb = build_skb_around(skb, hard_start, frame_size);
623 if (unlikely(!skb))
624 return NULL;
625
626 skb_reserve(skb, headroom);
627 __skb_put(skb, xdpf->len);
628 if (xdpf->metasize)
629 skb_metadata_set(skb, xdpf->metasize);
630
631 if (unlikely(xdp_frame_has_frags(xdpf)))
632 xdp_update_skb_shared_info(skb, nr_frags,
633 sinfo->xdp_frags_size,
634 nr_frags * xdpf->frame_sz,
635 xdp_frame_is_frag_pfmemalloc(xdpf));
636
637 /* Essential SKB info: protocol and skb->dev */
638 skb->protocol = eth_type_trans(skb, dev);
639
640 /* Optional SKB info, currently missing:
641 * - HW checksum info (skb->ip_summed)
642 * - HW RX hash (skb_set_hash)
643 * - RX ring dev queue index (skb_record_rx_queue)
644 */
645
646 if (xdpf->mem.type == MEM_TYPE_PAGE_POOL)
647 skb_mark_for_recycle(skb);
648
649 /* Allow SKB to reuse area used by xdp_frame */
650 xdp_scrub_frame(xdpf);
651
652 return skb;
653}
654EXPORT_SYMBOL_GPL(__xdp_build_skb_from_frame);
655
656struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf,
657 struct net_device *dev)
658{
659 struct sk_buff *skb;
660
661 skb = kmem_cache_alloc(skbuff_cache, GFP_ATOMIC);
662 if (unlikely(!skb))
663 return NULL;
664
665 memset(skb, 0, offsetof(struct sk_buff, tail));
666
667 return __xdp_build_skb_from_frame(xdpf, skb, dev);
668}
669EXPORT_SYMBOL_GPL(xdp_build_skb_from_frame);
670
671struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf)
672{
673 unsigned int headroom, totalsize;
674 struct xdp_frame *nxdpf;
675 struct page *page;
676 void *addr;
677
678 headroom = xdpf->headroom + sizeof(*xdpf);
679 totalsize = headroom + xdpf->len;
680
681 if (unlikely(totalsize > PAGE_SIZE))
682 return NULL;
683 page = dev_alloc_page();
684 if (!page)
685 return NULL;
686 addr = page_to_virt(page);
687
688 memcpy(addr, xdpf, totalsize);
689
690 nxdpf = addr;
691 nxdpf->data = addr + headroom;
692 nxdpf->frame_sz = PAGE_SIZE;
693 nxdpf->mem.type = MEM_TYPE_PAGE_ORDER0;
694 nxdpf->mem.id = 0;
695
696 return nxdpf;
697}
698
699__bpf_kfunc_start_defs();
700
701/**
702 * bpf_xdp_metadata_rx_timestamp - Read XDP frame RX timestamp.
703 * @ctx: XDP context pointer.
704 * @timestamp: Return value pointer.
705 *
706 * Return:
707 * * Returns 0 on success or ``-errno`` on error.
708 * * ``-EOPNOTSUPP`` : means device driver does not implement kfunc
709 * * ``-ENODATA`` : means no RX-timestamp available for this frame
710 */
711__bpf_kfunc int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp)
712{
713 return -EOPNOTSUPP;
714}
715
716/**
717 * bpf_xdp_metadata_rx_hash - Read XDP frame RX hash.
718 * @ctx: XDP context pointer.
719 * @hash: Return value pointer.
720 * @rss_type: Return value pointer for RSS type.
721 *
722 * The RSS hash type (@rss_type) specifies what portion of packet headers NIC
723 * hardware used when calculating RSS hash value. The RSS type can be decoded
724 * via &enum xdp_rss_hash_type either matching on individual L3/L4 bits
725 * ``XDP_RSS_L*`` or by combined traditional *RSS Hashing Types*
726 * ``XDP_RSS_TYPE_L*``.
727 *
728 * Return:
729 * * Returns 0 on success or ``-errno`` on error.
730 * * ``-EOPNOTSUPP`` : means device driver doesn't implement kfunc
731 * * ``-ENODATA`` : means no RX-hash available for this frame
732 */
733__bpf_kfunc int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, u32 *hash,
734 enum xdp_rss_hash_type *rss_type)
735{
736 return -EOPNOTSUPP;
737}
738
739/**
740 * bpf_xdp_metadata_rx_vlan_tag - Get XDP packet outermost VLAN tag
741 * @ctx: XDP context pointer.
742 * @vlan_proto: Destination pointer for VLAN Tag protocol identifier (TPID).
743 * @vlan_tci: Destination pointer for VLAN TCI (VID + DEI + PCP)
744 *
745 * In case of success, ``vlan_proto`` contains *Tag protocol identifier (TPID)*,
746 * usually ``ETH_P_8021Q`` or ``ETH_P_8021AD``, but some networks can use
747 * custom TPIDs. ``vlan_proto`` is stored in **network byte order (BE)**
748 * and should be used as follows:
749 * ``if (vlan_proto == bpf_htons(ETH_P_8021Q)) do_something();``
750 *
751 * ``vlan_tci`` contains the remaining 16 bits of a VLAN tag.
752 * Driver is expected to provide those in **host byte order (usually LE)**,
753 * so the bpf program should not perform byte conversion.
754 * According to 802.1Q standard, *VLAN TCI (Tag control information)*
755 * is a bit field that contains:
756 * *VLAN identifier (VID)* that can be read with ``vlan_tci & 0xfff``,
757 * *Drop eligible indicator (DEI)* - 1 bit,
758 * *Priority code point (PCP)* - 3 bits.
759 * For detailed meaning of DEI and PCP, please refer to other sources.
760 *
761 * Return:
762 * * Returns 0 on success or ``-errno`` on error.
763 * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
764 * * ``-ENODATA`` : VLAN tag was not stripped or is not available
765 */
766__bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
767 __be16 *vlan_proto, u16 *vlan_tci)
768{
769 return -EOPNOTSUPP;
770}
771
772__bpf_kfunc_end_defs();
773
774BTF_SET8_START(xdp_metadata_kfunc_ids)
775#define XDP_METADATA_KFUNC(_, __, name, ___) BTF_ID_FLAGS(func, name, KF_TRUSTED_ARGS)
776XDP_METADATA_KFUNC_xxx
777#undef XDP_METADATA_KFUNC
778BTF_SET8_END(xdp_metadata_kfunc_ids)
779
780static const struct btf_kfunc_id_set xdp_metadata_kfunc_set = {
781 .owner = THIS_MODULE,
782 .set = &xdp_metadata_kfunc_ids,
783};
784
785BTF_ID_LIST(xdp_metadata_kfunc_ids_unsorted)
786#define XDP_METADATA_KFUNC(name, _, str, __) BTF_ID(func, str)
787XDP_METADATA_KFUNC_xxx
788#undef XDP_METADATA_KFUNC
789
790u32 bpf_xdp_metadata_kfunc_id(int id)
791{
792 /* xdp_metadata_kfunc_ids is sorted and can't be used */
793 return xdp_metadata_kfunc_ids_unsorted[id];
794}
795
796bool bpf_dev_bound_kfunc_id(u32 btf_id)
797{
798 return btf_id_set8_contains(&xdp_metadata_kfunc_ids, btf_id);
799}
800
801static int __init xdp_metadata_init(void)
802{
803 return register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &xdp_metadata_kfunc_set);
804}
805late_initcall(xdp_metadata_init);
806
807void xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
808{
809 val &= NETDEV_XDP_ACT_MASK;
810 if (dev->xdp_features == val)
811 return;
812
813 dev->xdp_features = val;
814
815 if (dev->reg_state == NETREG_REGISTERED)
816 call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
817}
818EXPORT_SYMBOL_GPL(xdp_set_features_flag);
819
820void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
821{
822 xdp_features_t val = (dev->xdp_features | NETDEV_XDP_ACT_NDO_XMIT);
823
824 if (support_sg)
825 val |= NETDEV_XDP_ACT_NDO_XMIT_SG;
826 xdp_set_features_flag(dev, val);
827}
828EXPORT_SYMBOL_GPL(xdp_features_set_redirect_target);
829
830void xdp_features_clear_redirect_target(struct net_device *dev)
831{
832 xdp_features_t val = dev->xdp_features;
833
834 val &= ~(NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_NDO_XMIT_SG);
835 xdp_set_features_flag(dev, val);
836}
837EXPORT_SYMBOL_GPL(xdp_features_clear_redirect_target);