Commit | Line | Data |
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2b43470a BT |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | #include <net/xsk_buff_pool.h> | |
4 | #include <net/xdp_sock.h> | |
1c1efc2a | 5 | #include <net/xdp_sock_drv.h> |
2b43470a BT |
6 | |
7 | #include "xsk_queue.h" | |
1c1efc2a MK |
8 | #include "xdp_umem.h" |
9 | #include "xsk.h" | |
2b43470a | 10 | |
a5aa8e52 MK |
11 | void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs) |
12 | { | |
13 | unsigned long flags; | |
14 | ||
15 | if (!xs->tx) | |
16 | return; | |
17 | ||
18 | spin_lock_irqsave(&pool->xsk_tx_list_lock, flags); | |
19 | list_add_rcu(&xs->tx_list, &pool->xsk_tx_list); | |
20 | spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags); | |
21 | } | |
22 | ||
23 | void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs) | |
24 | { | |
25 | unsigned long flags; | |
26 | ||
27 | if (!xs->tx) | |
28 | return; | |
29 | ||
30 | spin_lock_irqsave(&pool->xsk_tx_list_lock, flags); | |
31 | list_del_rcu(&xs->tx_list); | |
32 | spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags); | |
33 | } | |
34 | ||
2b43470a BT |
35 | void xp_destroy(struct xsk_buff_pool *pool) |
36 | { | |
37 | if (!pool) | |
38 | return; | |
39 | ||
d1bc532e | 40 | kvfree(pool->tx_descs); |
2b43470a BT |
41 | kvfree(pool->heads); |
42 | kvfree(pool); | |
43 | } | |
44 | ||
ba3beec2 MF |
45 | int xp_alloc_tx_descs(struct xsk_buff_pool *pool, struct xdp_sock *xs) |
46 | { | |
47 | pool->tx_descs = kvcalloc(xs->tx->nentries, sizeof(*pool->tx_descs), | |
48 | GFP_KERNEL); | |
49 | if (!pool->tx_descs) | |
50 | return -ENOMEM; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
1c1efc2a MK |
55 | struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs, |
56 | struct xdp_umem *umem) | |
2b43470a | 57 | { |
94033cd8 | 58 | bool unaligned = umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG; |
2b43470a BT |
59 | struct xsk_buff_pool *pool; |
60 | struct xdp_buff_xsk *xskb; | |
94033cd8 | 61 | u32 i, entries; |
2b43470a | 62 | |
94033cd8 MK |
63 | entries = unaligned ? umem->chunks : 0; |
64 | pool = kvzalloc(struct_size(pool, free_heads, entries), GFP_KERNEL); | |
2b43470a BT |
65 | if (!pool) |
66 | goto out; | |
67 | ||
1c1efc2a | 68 | pool->heads = kvcalloc(umem->chunks, sizeof(*pool->heads), GFP_KERNEL); |
2b43470a BT |
69 | if (!pool->heads) |
70 | goto out; | |
71 | ||
ba3beec2 MF |
72 | if (xs->tx) |
73 | if (xp_alloc_tx_descs(pool, xs)) | |
d1bc532e | 74 | goto out; |
d1bc532e | 75 | |
1c1efc2a MK |
76 | pool->chunk_mask = ~((u64)umem->chunk_size - 1); |
77 | pool->addrs_cnt = umem->size; | |
78 | pool->heads_cnt = umem->chunks; | |
79 | pool->free_heads_cnt = umem->chunks; | |
80 | pool->headroom = umem->headroom; | |
81 | pool->chunk_size = umem->chunk_size; | |
94033cd8 MK |
82 | pool->chunk_shift = ffs(umem->chunk_size) - 1; |
83 | pool->unaligned = unaligned; | |
1c1efc2a MK |
84 | pool->frame_len = umem->chunk_size - umem->headroom - |
85 | XDP_PACKET_HEADROOM; | |
1742b3d5 | 86 | pool->umem = umem; |
7f7ffa4e | 87 | pool->addrs = umem->addrs; |
2b43470a | 88 | INIT_LIST_HEAD(&pool->free_list); |
a5aa8e52 MK |
89 | INIT_LIST_HEAD(&pool->xsk_tx_list); |
90 | spin_lock_init(&pool->xsk_tx_list_lock); | |
f09ced40 | 91 | spin_lock_init(&pool->cq_lock); |
1c1efc2a | 92 | refcount_set(&pool->users, 1); |
2b43470a | 93 | |
7361f9c3 MK |
94 | pool->fq = xs->fq_tmp; |
95 | pool->cq = xs->cq_tmp; | |
7361f9c3 | 96 | |
2b43470a BT |
97 | for (i = 0; i < pool->free_heads_cnt; i++) { |
98 | xskb = &pool->heads[i]; | |
99 | xskb->pool = pool; | |
1c1efc2a | 100 | xskb->xdp.frame_sz = umem->chunk_size - umem->headroom; |
5bec7ca2 | 101 | INIT_LIST_HEAD(&xskb->free_list_node); |
94033cd8 MK |
102 | if (pool->unaligned) |
103 | pool->free_heads[i] = xskb; | |
104 | else | |
105 | xp_init_xskb_addr(xskb, pool, i * pool->chunk_size); | |
2b43470a BT |
106 | } |
107 | ||
7f7ffa4e | 108 | return pool; |
2b43470a BT |
109 | |
110 | out: | |
111 | xp_destroy(pool); | |
112 | return NULL; | |
113 | } | |
114 | ||
2b43470a BT |
115 | void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq) |
116 | { | |
117 | u32 i; | |
118 | ||
119 | for (i = 0; i < pool->heads_cnt; i++) | |
120 | pool->heads[i].xdp.rxq = rxq; | |
121 | } | |
122 | EXPORT_SYMBOL(xp_set_rxq_info); | |
123 | ||
921b6869 MK |
124 | static void xp_disable_drv_zc(struct xsk_buff_pool *pool) |
125 | { | |
126 | struct netdev_bpf bpf; | |
127 | int err; | |
128 | ||
129 | ASSERT_RTNL(); | |
130 | ||
131 | if (pool->umem->zc) { | |
132 | bpf.command = XDP_SETUP_XSK_POOL; | |
133 | bpf.xsk.pool = NULL; | |
134 | bpf.xsk.queue_id = pool->queue_id; | |
135 | ||
136 | err = pool->netdev->netdev_ops->ndo_bpf(pool->netdev, &bpf); | |
137 | ||
138 | if (err) | |
139 | WARN(1, "Failed to disable zero-copy!\n"); | |
140 | } | |
141 | } | |
142 | ||
f0863eab BT |
143 | int xp_assign_dev(struct xsk_buff_pool *pool, |
144 | struct net_device *netdev, u16 queue_id, u16 flags) | |
1c1efc2a | 145 | { |
1c1efc2a MK |
146 | bool force_zc, force_copy; |
147 | struct netdev_bpf bpf; | |
148 | int err = 0; | |
149 | ||
150 | ASSERT_RTNL(); | |
151 | ||
152 | force_zc = flags & XDP_ZEROCOPY; | |
153 | force_copy = flags & XDP_COPY; | |
154 | ||
155 | if (force_zc && force_copy) | |
156 | return -EINVAL; | |
157 | ||
c2d3d6a4 | 158 | if (xsk_get_pool_from_qid(netdev, queue_id)) |
1c1efc2a MK |
159 | return -EBUSY; |
160 | ||
921b6869 MK |
161 | pool->netdev = netdev; |
162 | pool->queue_id = queue_id; | |
c2d3d6a4 | 163 | err = xsk_reg_pool_at_qid(netdev, pool, queue_id); |
1c1efc2a MK |
164 | if (err) |
165 | return err; | |
166 | ||
e3920818 | 167 | if (flags & XDP_USE_NEED_WAKEUP) |
c2d3d6a4 | 168 | pool->uses_need_wakeup = true; |
e3920818 BT |
169 | /* Tx needs to be explicitly woken up the first time. Also |
170 | * for supporting drivers that do not implement this | |
171 | * feature. They will always have to call sendto() or poll(). | |
172 | */ | |
173 | pool->cached_need_wakeup = XDP_WAKEUP_TX; | |
1c1efc2a | 174 | |
c2d3d6a4 MK |
175 | dev_hold(netdev); |
176 | ||
1c1efc2a MK |
177 | if (force_copy) |
178 | /* For copy-mode, we are done. */ | |
179 | return 0; | |
180 | ||
c2d3d6a4 MK |
181 | if (!netdev->netdev_ops->ndo_bpf || |
182 | !netdev->netdev_ops->ndo_xsk_wakeup) { | |
1c1efc2a MK |
183 | err = -EOPNOTSUPP; |
184 | goto err_unreg_pool; | |
185 | } | |
186 | ||
187 | bpf.command = XDP_SETUP_XSK_POOL; | |
188 | bpf.xsk.pool = pool; | |
189 | bpf.xsk.queue_id = queue_id; | |
190 | ||
c2d3d6a4 | 191 | err = netdev->netdev_ops->ndo_bpf(netdev, &bpf); |
1c1efc2a MK |
192 | if (err) |
193 | goto err_unreg_pool; | |
194 | ||
921b6869 MK |
195 | if (!pool->dma_pages) { |
196 | WARN(1, "Driver did not DMA map zero-copy buffers"); | |
12c8a8ca | 197 | err = -EINVAL; |
921b6869 MK |
198 | goto err_unreg_xsk; |
199 | } | |
c2d3d6a4 | 200 | pool->umem->zc = true; |
1c1efc2a MK |
201 | return 0; |
202 | ||
921b6869 MK |
203 | err_unreg_xsk: |
204 | xp_disable_drv_zc(pool); | |
1c1efc2a MK |
205 | err_unreg_pool: |
206 | if (!force_zc) | |
207 | err = 0; /* fallback to copy mode */ | |
17864891 | 208 | if (err) { |
c2d3d6a4 | 209 | xsk_clear_pool_at_qid(netdev, queue_id); |
17864891 MM |
210 | dev_put(netdev); |
211 | } | |
1c1efc2a MK |
212 | return err; |
213 | } | |
214 | ||
b5aea28d MK |
215 | int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem, |
216 | struct net_device *dev, u16 queue_id) | |
217 | { | |
218 | u16 flags; | |
219 | ||
220 | /* One fill and completion ring required for each queue id. */ | |
221 | if (!pool->fq || !pool->cq) | |
222 | return -EINVAL; | |
223 | ||
224 | flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY; | |
225 | if (pool->uses_need_wakeup) | |
226 | flags |= XDP_USE_NEED_WAKEUP; | |
227 | ||
f0863eab | 228 | return xp_assign_dev(pool, dev, queue_id, flags); |
b5aea28d MK |
229 | } |
230 | ||
1c1efc2a MK |
231 | void xp_clear_dev(struct xsk_buff_pool *pool) |
232 | { | |
c2d3d6a4 | 233 | if (!pool->netdev) |
1c1efc2a MK |
234 | return; |
235 | ||
921b6869 | 236 | xp_disable_drv_zc(pool); |
c2d3d6a4 MK |
237 | xsk_clear_pool_at_qid(pool->netdev, pool->queue_id); |
238 | dev_put(pool->netdev); | |
239 | pool->netdev = NULL; | |
1c1efc2a MK |
240 | } |
241 | ||
242 | static void xp_release_deferred(struct work_struct *work) | |
243 | { | |
244 | struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool, | |
245 | work); | |
246 | ||
247 | rtnl_lock(); | |
248 | xp_clear_dev(pool); | |
249 | rtnl_unlock(); | |
250 | ||
7361f9c3 MK |
251 | if (pool->fq) { |
252 | xskq_destroy(pool->fq); | |
253 | pool->fq = NULL; | |
254 | } | |
255 | ||
256 | if (pool->cq) { | |
257 | xskq_destroy(pool->cq); | |
258 | pool->cq = NULL; | |
259 | } | |
260 | ||
537cf4e3 | 261 | xdp_put_umem(pool->umem, false); |
1c1efc2a MK |
262 | xp_destroy(pool); |
263 | } | |
264 | ||
265 | void xp_get_pool(struct xsk_buff_pool *pool) | |
266 | { | |
267 | refcount_inc(&pool->users); | |
268 | } | |
269 | ||
e5e1a4bc | 270 | bool xp_put_pool(struct xsk_buff_pool *pool) |
1c1efc2a MK |
271 | { |
272 | if (!pool) | |
e5e1a4bc | 273 | return false; |
1c1efc2a MK |
274 | |
275 | if (refcount_dec_and_test(&pool->users)) { | |
276 | INIT_WORK(&pool->work, xp_release_deferred); | |
277 | schedule_work(&pool->work); | |
e5e1a4bc | 278 | return true; |
1c1efc2a | 279 | } |
e5e1a4bc MK |
280 | |
281 | return false; | |
1c1efc2a MK |
282 | } |
283 | ||
921b6869 MK |
284 | static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool) |
285 | { | |
286 | struct xsk_dma_map *dma_map; | |
287 | ||
288 | list_for_each_entry(dma_map, &pool->umem->xsk_dma_list, list) { | |
289 | if (dma_map->netdev == pool->netdev) | |
290 | return dma_map; | |
291 | } | |
292 | ||
293 | return NULL; | |
294 | } | |
295 | ||
296 | static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_device *netdev, | |
297 | u32 nr_pages, struct xdp_umem *umem) | |
298 | { | |
299 | struct xsk_dma_map *dma_map; | |
300 | ||
301 | dma_map = kzalloc(sizeof(*dma_map), GFP_KERNEL); | |
302 | if (!dma_map) | |
303 | return NULL; | |
304 | ||
305 | dma_map->dma_pages = kvcalloc(nr_pages, sizeof(*dma_map->dma_pages), GFP_KERNEL); | |
1d6fd78a | 306 | if (!dma_map->dma_pages) { |
921b6869 MK |
307 | kfree(dma_map); |
308 | return NULL; | |
309 | } | |
310 | ||
311 | dma_map->netdev = netdev; | |
312 | dma_map->dev = dev; | |
313 | dma_map->dma_need_sync = false; | |
314 | dma_map->dma_pages_cnt = nr_pages; | |
bf74a370 | 315 | refcount_set(&dma_map->users, 1); |
921b6869 MK |
316 | list_add(&dma_map->list, &umem->xsk_dma_list); |
317 | return dma_map; | |
318 | } | |
319 | ||
320 | static void xp_destroy_dma_map(struct xsk_dma_map *dma_map) | |
321 | { | |
322 | list_del(&dma_map->list); | |
323 | kvfree(dma_map->dma_pages); | |
324 | kfree(dma_map); | |
325 | } | |
326 | ||
327 | static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs) | |
2b43470a BT |
328 | { |
329 | dma_addr_t *dma; | |
330 | u32 i; | |
331 | ||
921b6869 MK |
332 | for (i = 0; i < dma_map->dma_pages_cnt; i++) { |
333 | dma = &dma_map->dma_pages[i]; | |
2b43470a | 334 | if (*dma) { |
512d1999 | 335 | *dma &= ~XSK_NEXT_PG_CONTIG_MASK; |
921b6869 | 336 | dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE, |
2b43470a BT |
337 | DMA_BIDIRECTIONAL, attrs); |
338 | *dma = 0; | |
339 | } | |
340 | } | |
341 | ||
921b6869 MK |
342 | xp_destroy_dma_map(dma_map); |
343 | } | |
344 | ||
345 | void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs) | |
346 | { | |
347 | struct xsk_dma_map *dma_map; | |
348 | ||
349 | if (pool->dma_pages_cnt == 0) | |
350 | return; | |
351 | ||
352 | dma_map = xp_find_dma_map(pool); | |
353 | if (!dma_map) { | |
354 | WARN(1, "Could not find dma_map for device"); | |
355 | return; | |
356 | } | |
357 | ||
358 | if (!refcount_dec_and_test(&dma_map->users)) | |
359 | return; | |
360 | ||
361 | __xp_dma_unmap(dma_map, attrs); | |
2b43470a BT |
362 | kvfree(pool->dma_pages); |
363 | pool->dma_pages_cnt = 0; | |
364 | pool->dev = NULL; | |
365 | } | |
366 | EXPORT_SYMBOL(xp_dma_unmap); | |
367 | ||
921b6869 | 368 | static void xp_check_dma_contiguity(struct xsk_dma_map *dma_map) |
2b43470a BT |
369 | { |
370 | u32 i; | |
371 | ||
921b6869 MK |
372 | for (i = 0; i < dma_map->dma_pages_cnt - 1; i++) { |
373 | if (dma_map->dma_pages[i] + PAGE_SIZE == dma_map->dma_pages[i + 1]) | |
374 | dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK; | |
2b43470a | 375 | else |
921b6869 | 376 | dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK; |
2b43470a BT |
377 | } |
378 | } | |
379 | ||
921b6869 MK |
380 | static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_map) |
381 | { | |
382 | pool->dma_pages = kvcalloc(dma_map->dma_pages_cnt, sizeof(*pool->dma_pages), GFP_KERNEL); | |
383 | if (!pool->dma_pages) | |
384 | return -ENOMEM; | |
385 | ||
386 | pool->dev = dma_map->dev; | |
387 | pool->dma_pages_cnt = dma_map->dma_pages_cnt; | |
388 | pool->dma_need_sync = dma_map->dma_need_sync; | |
921b6869 MK |
389 | memcpy(pool->dma_pages, dma_map->dma_pages, |
390 | pool->dma_pages_cnt * sizeof(*pool->dma_pages)); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
2b43470a BT |
395 | int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev, |
396 | unsigned long attrs, struct page **pages, u32 nr_pages) | |
397 | { | |
921b6869 | 398 | struct xsk_dma_map *dma_map; |
2b43470a | 399 | dma_addr_t dma; |
921b6869 | 400 | int err; |
2b43470a BT |
401 | u32 i; |
402 | ||
921b6869 MK |
403 | dma_map = xp_find_dma_map(pool); |
404 | if (dma_map) { | |
405 | err = xp_init_dma_info(pool, dma_map); | |
406 | if (err) | |
407 | return err; | |
2b43470a | 408 | |
bf74a370 | 409 | refcount_inc(&dma_map->users); |
921b6869 MK |
410 | return 0; |
411 | } | |
2b43470a | 412 | |
921b6869 MK |
413 | dma_map = xp_create_dma_map(dev, pool->netdev, nr_pages, pool->umem); |
414 | if (!dma_map) | |
415 | return -ENOMEM; | |
416 | ||
417 | for (i = 0; i < dma_map->dma_pages_cnt; i++) { | |
2b43470a BT |
418 | dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE, |
419 | DMA_BIDIRECTIONAL, attrs); | |
420 | if (dma_mapping_error(dev, dma)) { | |
921b6869 | 421 | __xp_dma_unmap(dma_map, attrs); |
2b43470a BT |
422 | return -ENOMEM; |
423 | } | |
7e024575 | 424 | if (dma_need_sync(dev, dma)) |
921b6869 MK |
425 | dma_map->dma_need_sync = true; |
426 | dma_map->dma_pages[i] = dma; | |
2b43470a BT |
427 | } |
428 | ||
429 | if (pool->unaligned) | |
921b6869 | 430 | xp_check_dma_contiguity(dma_map); |
94033cd8 MK |
431 | else |
432 | for (i = 0; i < pool->heads_cnt; i++) { | |
433 | struct xdp_buff_xsk *xskb = &pool->heads[i]; | |
434 | ||
435 | xp_init_xskb_dma(xskb, pool, dma_map->dma_pages, xskb->orig_addr); | |
436 | } | |
921b6869 MK |
437 | |
438 | err = xp_init_dma_info(pool, dma_map); | |
439 | if (err) { | |
440 | __xp_dma_unmap(dma_map, attrs); | |
441 | return err; | |
442 | } | |
443 | ||
2b43470a BT |
444 | return 0; |
445 | } | |
446 | EXPORT_SYMBOL(xp_dma_map); | |
447 | ||
2b43470a BT |
448 | static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool, |
449 | u64 addr) | |
450 | { | |
451 | return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size); | |
452 | } | |
453 | ||
2b43470a BT |
454 | static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr) |
455 | { | |
456 | *addr = xp_unaligned_extract_addr(*addr); | |
457 | if (*addr >= pool->addrs_cnt || | |
458 | *addr + pool->chunk_size > pool->addrs_cnt || | |
459 | xp_addr_crosses_non_contig_pg(pool, *addr)) | |
460 | return false; | |
461 | return true; | |
462 | } | |
463 | ||
464 | static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr) | |
465 | { | |
466 | *addr = xp_aligned_extract_addr(pool, *addr); | |
467 | return *addr < pool->addrs_cnt; | |
468 | } | |
469 | ||
470 | static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool) | |
471 | { | |
472 | struct xdp_buff_xsk *xskb; | |
473 | u64 addr; | |
474 | bool ok; | |
475 | ||
476 | if (pool->free_heads_cnt == 0) | |
477 | return NULL; | |
478 | ||
2b43470a BT |
479 | for (;;) { |
480 | if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) { | |
8aa5a335 | 481 | pool->fq->queue_empty_descs++; |
2b43470a BT |
482 | return NULL; |
483 | } | |
484 | ||
485 | ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : | |
486 | xp_check_aligned(pool, &addr); | |
487 | if (!ok) { | |
488 | pool->fq->invalid_descs++; | |
489 | xskq_cons_release(pool->fq); | |
490 | continue; | |
491 | } | |
492 | break; | |
493 | } | |
2b43470a | 494 | |
94033cd8 MK |
495 | if (pool->unaligned) { |
496 | xskb = pool->free_heads[--pool->free_heads_cnt]; | |
497 | xp_init_xskb_addr(xskb, pool, addr); | |
498 | if (pool->dma_pages_cnt) | |
499 | xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr); | |
500 | } else { | |
501 | xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)]; | |
2b43470a | 502 | } |
94033cd8 MK |
503 | |
504 | xskq_cons_release(pool->fq); | |
2b43470a BT |
505 | return xskb; |
506 | } | |
507 | ||
508 | struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool) | |
509 | { | |
510 | struct xdp_buff_xsk *xskb; | |
511 | ||
512 | if (!pool->free_list_cnt) { | |
513 | xskb = __xp_alloc(pool); | |
514 | if (!xskb) | |
515 | return NULL; | |
516 | } else { | |
517 | pool->free_list_cnt--; | |
518 | xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, | |
519 | free_list_node); | |
199d983b | 520 | list_del_init(&xskb->free_list_node); |
2b43470a BT |
521 | } |
522 | ||
523 | xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM; | |
524 | xskb->xdp.data_meta = xskb->xdp.data; | |
525 | ||
91d5b702 | 526 | if (pool->dma_need_sync) { |
2b43470a BT |
527 | dma_sync_single_range_for_device(pool->dev, xskb->dma, 0, |
528 | pool->frame_len, | |
529 | DMA_BIDIRECTIONAL); | |
530 | } | |
531 | return &xskb->xdp; | |
532 | } | |
533 | EXPORT_SYMBOL(xp_alloc); | |
534 | ||
47e4075d MK |
535 | static u32 xp_alloc_new_from_fq(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) |
536 | { | |
537 | u32 i, cached_cons, nb_entries; | |
538 | ||
539 | if (max > pool->free_heads_cnt) | |
540 | max = pool->free_heads_cnt; | |
541 | max = xskq_cons_nb_entries(pool->fq, max); | |
542 | ||
543 | cached_cons = pool->fq->cached_cons; | |
544 | nb_entries = max; | |
545 | i = max; | |
546 | while (i--) { | |
547 | struct xdp_buff_xsk *xskb; | |
548 | u64 addr; | |
549 | bool ok; | |
550 | ||
551 | __xskq_cons_read_addr_unchecked(pool->fq, cached_cons++, &addr); | |
552 | ||
553 | ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : | |
554 | xp_check_aligned(pool, &addr); | |
555 | if (unlikely(!ok)) { | |
556 | pool->fq->invalid_descs++; | |
557 | nb_entries--; | |
558 | continue; | |
559 | } | |
560 | ||
94033cd8 MK |
561 | if (pool->unaligned) { |
562 | xskb = pool->free_heads[--pool->free_heads_cnt]; | |
563 | xp_init_xskb_addr(xskb, pool, addr); | |
564 | if (pool->dma_pages_cnt) | |
565 | xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr); | |
566 | } else { | |
567 | xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)]; | |
568 | } | |
569 | ||
47e4075d | 570 | *xdp = &xskb->xdp; |
47e4075d MK |
571 | xdp++; |
572 | } | |
573 | ||
574 | xskq_cons_release_n(pool->fq, max); | |
575 | return nb_entries; | |
576 | } | |
577 | ||
578 | static u32 xp_alloc_reused(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 nb_entries) | |
579 | { | |
580 | struct xdp_buff_xsk *xskb; | |
581 | u32 i; | |
582 | ||
583 | nb_entries = min_t(u32, nb_entries, pool->free_list_cnt); | |
584 | ||
585 | i = nb_entries; | |
586 | while (i--) { | |
587 | xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, free_list_node); | |
199d983b | 588 | list_del_init(&xskb->free_list_node); |
47e4075d MK |
589 | |
590 | *xdp = &xskb->xdp; | |
591 | xdp++; | |
592 | } | |
593 | pool->free_list_cnt -= nb_entries; | |
594 | ||
595 | return nb_entries; | |
596 | } | |
597 | ||
598 | u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) | |
599 | { | |
600 | u32 nb_entries1 = 0, nb_entries2; | |
601 | ||
602 | if (unlikely(pool->dma_need_sync)) { | |
a95a4d9b MK |
603 | struct xdp_buff *buff; |
604 | ||
47e4075d | 605 | /* Slow path */ |
a95a4d9b MK |
606 | buff = xp_alloc(pool); |
607 | if (buff) | |
608 | *xdp = buff; | |
609 | return !!buff; | |
47e4075d MK |
610 | } |
611 | ||
612 | if (unlikely(pool->free_list_cnt)) { | |
613 | nb_entries1 = xp_alloc_reused(pool, xdp, max); | |
614 | if (nb_entries1 == max) | |
615 | return nb_entries1; | |
616 | ||
617 | max -= nb_entries1; | |
618 | xdp += nb_entries1; | |
619 | } | |
620 | ||
621 | nb_entries2 = xp_alloc_new_from_fq(pool, xdp, max); | |
622 | if (!nb_entries2) | |
623 | pool->fq->queue_empty_descs++; | |
624 | ||
625 | return nb_entries1 + nb_entries2; | |
626 | } | |
627 | EXPORT_SYMBOL(xp_alloc_batch); | |
628 | ||
2b43470a BT |
629 | bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count) |
630 | { | |
631 | if (pool->free_list_cnt >= count) | |
632 | return true; | |
633 | return xskq_cons_has_entries(pool->fq, count - pool->free_list_cnt); | |
634 | } | |
635 | EXPORT_SYMBOL(xp_can_alloc); | |
636 | ||
637 | void xp_free(struct xdp_buff_xsk *xskb) | |
638 | { | |
199d983b MK |
639 | if (!list_empty(&xskb->free_list_node)) |
640 | return; | |
641 | ||
2b43470a BT |
642 | xskb->pool->free_list_cnt++; |
643 | list_add(&xskb->free_list_node, &xskb->pool->free_list); | |
644 | } | |
645 | EXPORT_SYMBOL(xp_free); | |
646 | ||
2b43470a BT |
647 | void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr) |
648 | { | |
649 | addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr; | |
650 | return pool->addrs + addr; | |
651 | } | |
652 | EXPORT_SYMBOL(xp_raw_get_data); | |
653 | ||
654 | dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr) | |
655 | { | |
656 | addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr; | |
657 | return (pool->dma_pages[addr >> PAGE_SHIFT] & | |
658 | ~XSK_NEXT_PG_CONTIG_MASK) + | |
659 | (addr & ~PAGE_MASK); | |
660 | } | |
661 | EXPORT_SYMBOL(xp_raw_get_dma); | |
662 | ||
26062b18 | 663 | void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb) |
2b43470a | 664 | { |
2b43470a BT |
665 | dma_sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0, |
666 | xskb->pool->frame_len, DMA_BIDIRECTIONAL); | |
667 | } | |
26062b18 | 668 | EXPORT_SYMBOL(xp_dma_sync_for_cpu_slow); |
2b43470a | 669 | |
26062b18 BT |
670 | void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma, |
671 | size_t size) | |
2b43470a | 672 | { |
2b43470a BT |
673 | dma_sync_single_range_for_device(pool->dev, dma, 0, |
674 | size, DMA_BIDIRECTIONAL); | |
675 | } | |
26062b18 | 676 | EXPORT_SYMBOL(xp_dma_sync_for_device_slow); |