Commit | Line | Data |
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ddc64d0a | 1 | // SPDX-License-Identifier: GPL-2.0-only |
aecd67b6 JDB |
2 | /* net/core/xdp.c |
3 | * | |
4 | * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc. | |
aecd67b6 | 5 | */ |
05296620 JK |
6 | #include <linux/bpf.h> |
7 | #include <linux/filter.h> | |
aecd67b6 JDB |
8 | #include <linux/types.h> |
9 | #include <linux/mm.h> | |
05296620 | 10 | #include <linux/netdevice.h> |
8d5d8852 JDB |
11 | #include <linux/slab.h> |
12 | #include <linux/idr.h> | |
13 | #include <linux/rhashtable.h> | |
34cc0b33 | 14 | #include <linux/bug.h> |
57d0a1c1 | 15 | #include <net/page_pool.h> |
aecd67b6 JDB |
16 | |
17 | #include <net/xdp.h> | |
f033b688 JDB |
18 | #include <net/xdp_priv.h> /* struct xdp_mem_allocator */ |
19 | #include <trace/events/xdp.h> | |
2b43470a | 20 | #include <net/xdp_sock_drv.h> |
aecd67b6 JDB |
21 | |
22 | #define REG_STATE_NEW 0x0 | |
23 | #define REG_STATE_REGISTERED 0x1 | |
24 | #define REG_STATE_UNREGISTERED 0x2 | |
25 | #define REG_STATE_UNUSED 0x3 | |
26 | ||
8d5d8852 JDB |
27 | static DEFINE_IDA(mem_id_pool); |
28 | static DEFINE_MUTEX(mem_id_lock); | |
29 | #define MEM_ID_MAX 0xFFFE | |
30 | #define MEM_ID_MIN 1 | |
31 | static int mem_id_next = MEM_ID_MIN; | |
32 | ||
33 | static bool mem_id_init; /* false */ | |
34 | static struct rhashtable *mem_id_ht; | |
35 | ||
8d5d8852 JDB |
36 | static u32 xdp_mem_id_hashfn(const void *data, u32 len, u32 seed) |
37 | { | |
38 | const u32 *k = data; | |
39 | const u32 key = *k; | |
40 | ||
c593642c | 41 | BUILD_BUG_ON(sizeof_field(struct xdp_mem_allocator, mem.id) |
8d5d8852 JDB |
42 | != sizeof(u32)); |
43 | ||
9f9a7077 N |
44 | /* Use cyclic increasing ID as direct hash key */ |
45 | return key; | |
8d5d8852 JDB |
46 | } |
47 | ||
48 | static int xdp_mem_id_cmp(struct rhashtable_compare_arg *arg, | |
49 | const void *ptr) | |
50 | { | |
51 | const struct xdp_mem_allocator *xa = ptr; | |
52 | u32 mem_id = *(u32 *)arg->key; | |
53 | ||
54 | return xa->mem.id != mem_id; | |
55 | } | |
56 | ||
57 | static const struct rhashtable_params mem_id_rht_params = { | |
58 | .nelem_hint = 64, | |
59 | .head_offset = offsetof(struct xdp_mem_allocator, node), | |
60 | .key_offset = offsetof(struct xdp_mem_allocator, mem.id), | |
c593642c | 61 | .key_len = sizeof_field(struct xdp_mem_allocator, mem.id), |
8d5d8852 JDB |
62 | .max_size = MEM_ID_MAX, |
63 | .min_size = 8, | |
64 | .automatic_shrinking = true, | |
65 | .hashfn = xdp_mem_id_hashfn, | |
66 | .obj_cmpfn = xdp_mem_id_cmp, | |
67 | }; | |
68 | ||
69 | static void __xdp_mem_allocator_rcu_free(struct rcu_head *rcu) | |
70 | { | |
71 | struct xdp_mem_allocator *xa; | |
72 | ||
73 | xa = container_of(rcu, struct xdp_mem_allocator, rcu); | |
74 | ||
75 | /* Allow this ID to be reused */ | |
76 | ida_simple_remove(&mem_id_pool, xa->mem.id); | |
77 | ||
8d5d8852 JDB |
78 | kfree(xa); |
79 | } | |
80 | ||
c3f812ce | 81 | static void mem_xa_remove(struct xdp_mem_allocator *xa) |
99c07c43 | 82 | { |
c3f812ce | 83 | trace_mem_disconnect(xa); |
99c07c43 | 84 | |
c3f812ce | 85 | if (!rhashtable_remove_fast(mem_id_ht, &xa->node, mem_id_rht_params)) |
99c07c43 | 86 | call_rcu(&xa->rcu, __xdp_mem_allocator_rcu_free); |
99c07c43 JDB |
87 | } |
88 | ||
c3f812ce JL |
89 | static void mem_allocator_disconnect(void *allocator) |
90 | { | |
91 | struct xdp_mem_allocator *xa; | |
92 | struct rhashtable_iter iter; | |
93 | ||
86c76c09 JL |
94 | mutex_lock(&mem_id_lock); |
95 | ||
c3f812ce JL |
96 | rhashtable_walk_enter(mem_id_ht, &iter); |
97 | do { | |
98 | rhashtable_walk_start(&iter); | |
99 | ||
100 | while ((xa = rhashtable_walk_next(&iter)) && !IS_ERR(xa)) { | |
101 | if (xa->allocator == allocator) | |
102 | mem_xa_remove(xa); | |
103 | } | |
104 | ||
105 | rhashtable_walk_stop(&iter); | |
99c07c43 | 106 | |
c3f812ce JL |
107 | } while (xa == ERR_PTR(-EAGAIN)); |
108 | rhashtable_walk_exit(&iter); | |
86c76c09 JL |
109 | |
110 | mutex_unlock(&mem_id_lock); | |
c3f812ce JL |
111 | } |
112 | ||
dce5bd61 | 113 | void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq) |
8d5d8852 JDB |
114 | { |
115 | struct xdp_mem_allocator *xa; | |
116 | int id = xdp_rxq->mem.id; | |
8d5d8852 | 117 | |
dce5bd61 BT |
118 | if (xdp_rxq->reg_state != REG_STATE_REGISTERED) { |
119 | WARN(1, "Missing register, driver bug"); | |
120 | return; | |
121 | } | |
122 | ||
8d5d8852 JDB |
123 | if (id == 0) |
124 | return; | |
125 | ||
c3f812ce JL |
126 | if (xdp_rxq->mem.type == MEM_TYPE_PAGE_POOL) { |
127 | rcu_read_lock(); | |
128 | xa = rhashtable_lookup(mem_id_ht, &id, mem_id_rht_params); | |
129 | page_pool_destroy(xa->page_pool); | |
130 | rcu_read_unlock(); | |
99c07c43 | 131 | } |
8d5d8852 | 132 | } |
dce5bd61 | 133 | EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg_mem_model); |
8d5d8852 | 134 | |
aecd67b6 JDB |
135 | void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq) |
136 | { | |
137 | /* Simplify driver cleanup code paths, allow unreg "unused" */ | |
138 | if (xdp_rxq->reg_state == REG_STATE_UNUSED) | |
139 | return; | |
140 | ||
141 | WARN(!(xdp_rxq->reg_state == REG_STATE_REGISTERED), "Driver BUG"); | |
142 | ||
dce5bd61 | 143 | xdp_rxq_info_unreg_mem_model(xdp_rxq); |
8d5d8852 | 144 | |
aecd67b6 JDB |
145 | xdp_rxq->reg_state = REG_STATE_UNREGISTERED; |
146 | xdp_rxq->dev = NULL; | |
8d5d8852 JDB |
147 | |
148 | /* Reset mem info to defaults */ | |
149 | xdp_rxq->mem.id = 0; | |
150 | xdp_rxq->mem.type = 0; | |
aecd67b6 JDB |
151 | } |
152 | EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg); | |
153 | ||
154 | static void xdp_rxq_info_init(struct xdp_rxq_info *xdp_rxq) | |
155 | { | |
156 | memset(xdp_rxq, 0, sizeof(*xdp_rxq)); | |
157 | } | |
158 | ||
159 | /* Returns 0 on success, negative on failure */ | |
160 | int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, | |
b02e5a0e | 161 | struct net_device *dev, u32 queue_index, unsigned int napi_id) |
aecd67b6 JDB |
162 | { |
163 | if (xdp_rxq->reg_state == REG_STATE_UNUSED) { | |
164 | WARN(1, "Driver promised not to register this"); | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | if (xdp_rxq->reg_state == REG_STATE_REGISTERED) { | |
169 | WARN(1, "Missing unregister, handled but fix driver"); | |
170 | xdp_rxq_info_unreg(xdp_rxq); | |
171 | } | |
172 | ||
173 | if (!dev) { | |
174 | WARN(1, "Missing net_device from driver"); | |
175 | return -ENODEV; | |
176 | } | |
177 | ||
178 | /* State either UNREGISTERED or NEW */ | |
179 | xdp_rxq_info_init(xdp_rxq); | |
180 | xdp_rxq->dev = dev; | |
181 | xdp_rxq->queue_index = queue_index; | |
b02e5a0e | 182 | xdp_rxq->napi_id = napi_id; |
aecd67b6 JDB |
183 | |
184 | xdp_rxq->reg_state = REG_STATE_REGISTERED; | |
185 | return 0; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(xdp_rxq_info_reg); | |
188 | ||
189 | void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq) | |
190 | { | |
191 | xdp_rxq->reg_state = REG_STATE_UNUSED; | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(xdp_rxq_info_unused); | |
c0124f32 JDB |
194 | |
195 | bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq) | |
196 | { | |
197 | return (xdp_rxq->reg_state == REG_STATE_REGISTERED); | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(xdp_rxq_info_is_reg); | |
5ab073ff | 200 | |
8d5d8852 JDB |
201 | static int __mem_id_init_hash_table(void) |
202 | { | |
203 | struct rhashtable *rht; | |
204 | int ret; | |
205 | ||
206 | if (unlikely(mem_id_init)) | |
207 | return 0; | |
208 | ||
209 | rht = kzalloc(sizeof(*rht), GFP_KERNEL); | |
210 | if (!rht) | |
211 | return -ENOMEM; | |
212 | ||
213 | ret = rhashtable_init(rht, &mem_id_rht_params); | |
214 | if (ret < 0) { | |
215 | kfree(rht); | |
216 | return ret; | |
217 | } | |
218 | mem_id_ht = rht; | |
219 | smp_mb(); /* mutex lock should provide enough pairing */ | |
220 | mem_id_init = true; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | /* Allocate a cyclic ID that maps to allocator pointer. | |
226 | * See: https://www.kernel.org/doc/html/latest/core-api/idr.html | |
227 | * | |
228 | * Caller must lock mem_id_lock. | |
229 | */ | |
230 | static int __mem_id_cyclic_get(gfp_t gfp) | |
231 | { | |
232 | int retries = 1; | |
233 | int id; | |
234 | ||
235 | again: | |
236 | id = ida_simple_get(&mem_id_pool, mem_id_next, MEM_ID_MAX, gfp); | |
237 | if (id < 0) { | |
238 | if (id == -ENOSPC) { | |
239 | /* Cyclic allocator, reset next id */ | |
240 | if (retries--) { | |
241 | mem_id_next = MEM_ID_MIN; | |
242 | goto again; | |
243 | } | |
244 | } | |
245 | return id; /* errno */ | |
246 | } | |
247 | mem_id_next = id + 1; | |
248 | ||
249 | return id; | |
250 | } | |
251 | ||
57d0a1c1 JDB |
252 | static bool __is_supported_mem_type(enum xdp_mem_type type) |
253 | { | |
254 | if (type == MEM_TYPE_PAGE_POOL) | |
255 | return is_page_pool_compiled_in(); | |
256 | ||
257 | if (type >= MEM_TYPE_MAX) | |
258 | return false; | |
259 | ||
260 | return true; | |
261 | } | |
262 | ||
5ab073ff JDB |
263 | int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, |
264 | enum xdp_mem_type type, void *allocator) | |
265 | { | |
8d5d8852 JDB |
266 | struct xdp_mem_allocator *xdp_alloc; |
267 | gfp_t gfp = GFP_KERNEL; | |
268 | int id, errno, ret; | |
269 | void *ptr; | |
270 | ||
271 | if (xdp_rxq->reg_state != REG_STATE_REGISTERED) { | |
272 | WARN(1, "Missing register, driver bug"); | |
273 | return -EFAULT; | |
274 | } | |
275 | ||
57d0a1c1 JDB |
276 | if (!__is_supported_mem_type(type)) |
277 | return -EOPNOTSUPP; | |
5ab073ff JDB |
278 | |
279 | xdp_rxq->mem.type = type; | |
280 | ||
57d0a1c1 | 281 | if (!allocator) { |
0807892e | 282 | if (type == MEM_TYPE_PAGE_POOL) |
57d0a1c1 | 283 | return -EINVAL; /* Setup time check page_pool req */ |
8d5d8852 | 284 | return 0; |
57d0a1c1 | 285 | } |
8d5d8852 JDB |
286 | |
287 | /* Delay init of rhashtable to save memory if feature isn't used */ | |
288 | if (!mem_id_init) { | |
289 | mutex_lock(&mem_id_lock); | |
290 | ret = __mem_id_init_hash_table(); | |
291 | mutex_unlock(&mem_id_lock); | |
292 | if (ret < 0) { | |
293 | WARN_ON(1); | |
294 | return ret; | |
295 | } | |
296 | } | |
297 | ||
298 | xdp_alloc = kzalloc(sizeof(*xdp_alloc), gfp); | |
299 | if (!xdp_alloc) | |
300 | return -ENOMEM; | |
301 | ||
302 | mutex_lock(&mem_id_lock); | |
303 | id = __mem_id_cyclic_get(gfp); | |
304 | if (id < 0) { | |
305 | errno = id; | |
306 | goto err; | |
307 | } | |
308 | xdp_rxq->mem.id = id; | |
309 | xdp_alloc->mem = xdp_rxq->mem; | |
310 | xdp_alloc->allocator = allocator; | |
311 | ||
312 | /* Insert allocator into ID lookup table */ | |
313 | ptr = rhashtable_insert_slow(mem_id_ht, &id, &xdp_alloc->node); | |
314 | if (IS_ERR(ptr)) { | |
516a7593 JDB |
315 | ida_simple_remove(&mem_id_pool, xdp_rxq->mem.id); |
316 | xdp_rxq->mem.id = 0; | |
8d5d8852 JDB |
317 | errno = PTR_ERR(ptr); |
318 | goto err; | |
319 | } | |
320 | ||
1da4bbef | 321 | if (type == MEM_TYPE_PAGE_POOL) |
c3f812ce | 322 | page_pool_use_xdp_mem(allocator, mem_allocator_disconnect); |
1da4bbef | 323 | |
8d5d8852 | 324 | mutex_unlock(&mem_id_lock); |
5ab073ff | 325 | |
f033b688 | 326 | trace_mem_connect(xdp_alloc, xdp_rxq); |
5ab073ff | 327 | return 0; |
8d5d8852 JDB |
328 | err: |
329 | mutex_unlock(&mem_id_lock); | |
330 | kfree(xdp_alloc); | |
331 | return errno; | |
5ab073ff JDB |
332 | } |
333 | EXPORT_SYMBOL_GPL(xdp_rxq_info_reg_mem_model); | |
8d5d8852 | 334 | |
389ab7f0 JDB |
335 | /* XDP RX runs under NAPI protection, and in different delivery error |
336 | * scenarios (e.g. queue full), it is possible to return the xdp_frame | |
baead859 | 337 | * while still leveraging this protection. The @napi_direct boolean |
389ab7f0 | 338 | * is used for those calls sites. Thus, allowing for faster recycling |
ed1182dc | 339 | * of xdp_frames/pages in those cases. |
389ab7f0 | 340 | */ |
ed1182dc BT |
341 | static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, |
342 | struct xdp_buff *xdp) | |
8d5d8852 | 343 | { |
57d0a1c1 JDB |
344 | struct xdp_mem_allocator *xa; |
345 | struct page *page; | |
346 | ||
347 | switch (mem->type) { | |
348 | case MEM_TYPE_PAGE_POOL: | |
349 | rcu_read_lock(); | |
350 | /* mem->id is valid, checked in xdp_rxq_info_reg_mem_model() */ | |
351 | xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); | |
352 | page = virt_to_head_page(data); | |
622d1369 OBL |
353 | if (napi_direct && xdp_return_frame_no_direct()) |
354 | napi_direct = false; | |
458de8a9 | 355 | page_pool_put_full_page(xa->page_pool, page, napi_direct); |
57d0a1c1 JDB |
356 | rcu_read_unlock(); |
357 | break; | |
358 | case MEM_TYPE_PAGE_SHARED: | |
8d5d8852 | 359 | page_frag_free(data); |
57d0a1c1 JDB |
360 | break; |
361 | case MEM_TYPE_PAGE_ORDER0: | |
362 | page = virt_to_page(data); /* Assumes order0 page*/ | |
8d5d8852 | 363 | put_page(page); |
57d0a1c1 | 364 | break; |
ed1182dc BT |
365 | case MEM_TYPE_XSK_BUFF_POOL: |
366 | /* NB! Only valid from an xdp_buff! */ | |
367 | xsk_buff_free(xdp); | |
368 | break; | |
57d0a1c1 JDB |
369 | default: |
370 | /* Not possible, checked in xdp_rxq_info_reg_mem_model() */ | |
82c41671 | 371 | WARN(1, "Incorrect XDP memory type (%d) usage", mem->type); |
57d0a1c1 | 372 | break; |
8d5d8852 JDB |
373 | } |
374 | } | |
c497176c BT |
375 | |
376 | void xdp_return_frame(struct xdp_frame *xdpf) | |
377 | { | |
ed1182dc | 378 | __xdp_return(xdpf->data, &xdpf->mem, false, NULL); |
c497176c | 379 | } |
8d5d8852 | 380 | EXPORT_SYMBOL_GPL(xdp_return_frame); |
c497176c | 381 | |
389ab7f0 JDB |
382 | void xdp_return_frame_rx_napi(struct xdp_frame *xdpf) |
383 | { | |
ed1182dc | 384 | __xdp_return(xdpf->data, &xdpf->mem, true, NULL); |
389ab7f0 JDB |
385 | } |
386 | EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi); | |
387 | ||
89653987 LB |
388 | /* XDP bulk APIs introduce a defer/flush mechanism to return |
389 | * pages belonging to the same xdp_mem_allocator object | |
390 | * (identified via the mem.id field) in bulk to optimize | |
391 | * I-cache and D-cache. | |
392 | * The bulk queue size is set to 16 to be aligned to how | |
393 | * XDP_REDIRECT bulking works. The bulk is flushed when | |
394 | * it is full or when mem.id changes. | |
395 | * xdp_frame_bulk is usually stored/allocated on the function | |
396 | * call-stack to avoid locking penalties. | |
397 | */ | |
398 | void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) | |
399 | { | |
400 | struct xdp_mem_allocator *xa = bq->xa; | |
89653987 | 401 | |
78862447 | 402 | if (unlikely(!xa || !bq->count)) |
89653987 LB |
403 | return; |
404 | ||
78862447 | 405 | page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count); |
89653987 LB |
406 | /* bq->xa is not cleared to save lookup, if mem.id same in next bulk */ |
407 | bq->count = 0; | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(xdp_flush_frame_bulk); | |
410 | ||
411 | /* Must be called with rcu_read_lock held */ | |
412 | void xdp_return_frame_bulk(struct xdp_frame *xdpf, | |
413 | struct xdp_frame_bulk *bq) | |
414 | { | |
415 | struct xdp_mem_info *mem = &xdpf->mem; | |
416 | struct xdp_mem_allocator *xa; | |
417 | ||
418 | if (mem->type != MEM_TYPE_PAGE_POOL) { | |
46d5e62d | 419 | __xdp_return(xdpf->data, &xdpf->mem, false, NULL); |
89653987 LB |
420 | return; |
421 | } | |
422 | ||
423 | xa = bq->xa; | |
424 | if (unlikely(!xa)) { | |
425 | xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); | |
426 | bq->count = 0; | |
427 | bq->xa = xa; | |
428 | } | |
429 | ||
430 | if (bq->count == XDP_BULK_QUEUE_SIZE) | |
431 | xdp_flush_frame_bulk(bq); | |
432 | ||
433 | if (unlikely(mem->id != xa->mem.id)) { | |
434 | xdp_flush_frame_bulk(bq); | |
435 | bq->xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); | |
436 | } | |
437 | ||
438 | bq->q[bq->count++] = xdpf->data; | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(xdp_return_frame_bulk); | |
441 | ||
c497176c BT |
442 | void xdp_return_buff(struct xdp_buff *xdp) |
443 | { | |
ed1182dc | 444 | __xdp_return(xdp->data, &xdp->rxq->mem, true, xdp); |
c497176c | 445 | } |
05296620 | 446 | |
6bf071bf JDB |
447 | /* Only called for MEM_TYPE_PAGE_POOL see xdp.h */ |
448 | void __xdp_release_frame(void *data, struct xdp_mem_info *mem) | |
449 | { | |
450 | struct xdp_mem_allocator *xa; | |
451 | struct page *page; | |
452 | ||
453 | rcu_read_lock(); | |
454 | xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); | |
455 | page = virt_to_head_page(data); | |
456 | if (xa) | |
457 | page_pool_release_page(xa->page_pool, page); | |
458 | rcu_read_unlock(); | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(__xdp_release_frame); | |
461 | ||
05296620 JK |
462 | void xdp_attachment_setup(struct xdp_attachment_info *info, |
463 | struct netdev_bpf *bpf) | |
464 | { | |
465 | if (info->prog) | |
466 | bpf_prog_put(info->prog); | |
467 | info->prog = bpf->prog; | |
468 | info->flags = bpf->flags; | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(xdp_attachment_setup); | |
b0d1beef BT |
471 | |
472 | struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp) | |
473 | { | |
72962167 | 474 | unsigned int metasize, totsize; |
b0d1beef BT |
475 | void *addr, *data_to_copy; |
476 | struct xdp_frame *xdpf; | |
477 | struct page *page; | |
478 | ||
479 | /* Clone into a MEM_TYPE_PAGE_ORDER0 xdp_frame. */ | |
480 | metasize = xdp_data_meta_unsupported(xdp) ? 0 : | |
481 | xdp->data - xdp->data_meta; | |
b0d1beef BT |
482 | totsize = xdp->data_end - xdp->data + metasize; |
483 | ||
484 | if (sizeof(*xdpf) + totsize > PAGE_SIZE) | |
485 | return NULL; | |
486 | ||
487 | page = dev_alloc_page(); | |
488 | if (!page) | |
489 | return NULL; | |
490 | ||
491 | addr = page_to_virt(page); | |
492 | xdpf = addr; | |
493 | memset(xdpf, 0, sizeof(*xdpf)); | |
494 | ||
495 | addr += sizeof(*xdpf); | |
496 | data_to_copy = metasize ? xdp->data_meta : xdp->data; | |
497 | memcpy(addr, data_to_copy, totsize); | |
498 | ||
499 | xdpf->data = addr + metasize; | |
500 | xdpf->len = totsize - metasize; | |
501 | xdpf->headroom = 0; | |
502 | xdpf->metasize = metasize; | |
3ff23516 | 503 | xdpf->frame_sz = PAGE_SIZE; |
b0d1beef BT |
504 | xdpf->mem.type = MEM_TYPE_PAGE_ORDER0; |
505 | ||
82c41671 | 506 | xsk_buff_free(xdp); |
b0d1beef BT |
507 | return xdpf; |
508 | } | |
509 | EXPORT_SYMBOL_GPL(xdp_convert_zc_to_xdp_frame); | |
34cc0b33 JDB |
510 | |
511 | /* Used by XDP_WARN macro, to avoid inlining WARN() in fast-path */ | |
512 | void xdp_warn(const char *msg, const char *func, const int line) | |
513 | { | |
514 | WARN(1, "XDP_WARN: %s(line:%d): %s\n", func, line, msg); | |
515 | }; | |
516 | EXPORT_SYMBOL_GPL(xdp_warn); | |
97a0e1ea | 517 | |
65e6dcf7 LB |
518 | int xdp_alloc_skb_bulk(void **skbs, int n_skb, gfp_t gfp) |
519 | { | |
520 | n_skb = kmem_cache_alloc_bulk(skbuff_head_cache, gfp, | |
521 | n_skb, skbs); | |
522 | if (unlikely(!n_skb)) | |
523 | return -ENOMEM; | |
524 | ||
525 | return 0; | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(xdp_alloc_skb_bulk); | |
528 | ||
97a0e1ea LB |
529 | struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, |
530 | struct sk_buff *skb, | |
531 | struct net_device *dev) | |
532 | { | |
533 | unsigned int headroom, frame_size; | |
534 | void *hard_start; | |
535 | ||
536 | /* Part of headroom was reserved to xdpf */ | |
537 | headroom = sizeof(*xdpf) + xdpf->headroom; | |
538 | ||
539 | /* Memory size backing xdp_frame data already have reserved | |
540 | * room for build_skb to place skb_shared_info in tailroom. | |
541 | */ | |
542 | frame_size = xdpf->frame_sz; | |
543 | ||
544 | hard_start = xdpf->data - headroom; | |
545 | skb = build_skb_around(skb, hard_start, frame_size); | |
546 | if (unlikely(!skb)) | |
547 | return NULL; | |
548 | ||
549 | skb_reserve(skb, headroom); | |
550 | __skb_put(skb, xdpf->len); | |
551 | if (xdpf->metasize) | |
552 | skb_metadata_set(skb, xdpf->metasize); | |
553 | ||
554 | /* Essential SKB info: protocol and skb->dev */ | |
555 | skb->protocol = eth_type_trans(skb, dev); | |
556 | ||
557 | /* Optional SKB info, currently missing: | |
558 | * - HW checksum info (skb->ip_summed) | |
559 | * - HW RX hash (skb_set_hash) | |
560 | * - RX ring dev queue index (skb_record_rx_queue) | |
561 | */ | |
562 | ||
563 | /* Until page_pool get SKB return path, release DMA here */ | |
564 | xdp_release_frame(xdpf); | |
565 | ||
566 | /* Allow SKB to reuse area used by xdp_frame */ | |
567 | xdp_scrub_frame(xdpf); | |
568 | ||
569 | return skb; | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(__xdp_build_skb_from_frame); | |
89f479f0 LB |
572 | |
573 | struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, | |
574 | struct net_device *dev) | |
575 | { | |
576 | struct sk_buff *skb; | |
577 | ||
578 | skb = kmem_cache_alloc(skbuff_head_cache, GFP_ATOMIC); | |
579 | if (unlikely(!skb)) | |
580 | return NULL; | |
581 | ||
582 | memset(skb, 0, offsetof(struct sk_buff, tail)); | |
583 | ||
584 | return __xdp_build_skb_from_frame(xdpf, skb, dev); | |
585 | } | |
586 | EXPORT_SYMBOL_GPL(xdp_build_skb_from_frame); |