Commit | Line | Data |
---|---|---|
c0c77d8f BT |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* XDP sockets | |
3 | * | |
4 | * AF_XDP sockets allows a channel between XDP programs and userspace | |
5 | * applications. | |
6 | * Copyright(c) 2018 Intel Corporation. | |
7 | * | |
c0c77d8f BT |
8 | * Author(s): Björn Töpel <bjorn.topel@intel.com> |
9 | * Magnus Karlsson <magnus.karlsson@intel.com> | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ | |
13 | ||
14 | #include <linux/if_xdp.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/sched/mm.h> | |
17 | #include <linux/sched/signal.h> | |
18 | #include <linux/sched/task.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/file.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/net.h> | |
23 | #include <linux/netdevice.h> | |
ac98d8aa | 24 | #include <linux/rculist.h> |
951bce29 | 25 | #include <linux/vmalloc.h> |
a71506a4 | 26 | #include <net/xdp_sock_drv.h> |
a0731952 | 27 | #include <net/busy_poll.h> |
b9b6b68e | 28 | #include <net/xdp.h> |
c0c77d8f | 29 | |
423f3832 | 30 | #include "xsk_queue.h" |
c0c77d8f | 31 | #include "xdp_umem.h" |
a36b38aa | 32 | #include "xsk.h" |
c0c77d8f | 33 | |
e7a1c130 | 34 | #define TX_BATCH_SIZE 32 |
35fcde7f | 35 | |
e312b9e7 BT |
36 | static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); |
37 | ||
c4655761 | 38 | void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 39 | { |
c2d3d6a4 | 40 | if (pool->cached_need_wakeup & XDP_WAKEUP_RX) |
77cd0d7b MK |
41 | return; |
42 | ||
7361f9c3 | 43 | pool->fq->ring->flags |= XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 44 | pool->cached_need_wakeup |= XDP_WAKEUP_RX; |
77cd0d7b MK |
45 | } |
46 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
47 | ||
c4655761 | 48 | void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
49 | { |
50 | struct xdp_sock *xs; | |
51 | ||
c2d3d6a4 | 52 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) |
77cd0d7b MK |
53 | return; |
54 | ||
55 | rcu_read_lock(); | |
a5aa8e52 | 56 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
57 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
58 | } | |
59 | rcu_read_unlock(); | |
60 | ||
c2d3d6a4 | 61 | pool->cached_need_wakeup |= XDP_WAKEUP_TX; |
77cd0d7b MK |
62 | } |
63 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
64 | ||
c4655761 | 65 | void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 66 | { |
c2d3d6a4 | 67 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_RX)) |
77cd0d7b MK |
68 | return; |
69 | ||
7361f9c3 | 70 | pool->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 71 | pool->cached_need_wakeup &= ~XDP_WAKEUP_RX; |
77cd0d7b MK |
72 | } |
73 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
74 | ||
c4655761 | 75 | void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
76 | { |
77 | struct xdp_sock *xs; | |
78 | ||
c2d3d6a4 | 79 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_TX)) |
77cd0d7b MK |
80 | return; |
81 | ||
82 | rcu_read_lock(); | |
a5aa8e52 | 83 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
84 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
85 | } | |
86 | rcu_read_unlock(); | |
87 | ||
c2d3d6a4 | 88 | pool->cached_need_wakeup &= ~XDP_WAKEUP_TX; |
77cd0d7b MK |
89 | } |
90 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
91 | ||
c4655761 | 92 | bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 93 | { |
c2d3d6a4 | 94 | return pool->uses_need_wakeup; |
77cd0d7b | 95 | } |
c4655761 | 96 | EXPORT_SYMBOL(xsk_uses_need_wakeup); |
77cd0d7b | 97 | |
1c1efc2a MK |
98 | struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev, |
99 | u16 queue_id) | |
100 | { | |
101 | if (queue_id < dev->real_num_rx_queues) | |
102 | return dev->_rx[queue_id].pool; | |
103 | if (queue_id < dev->real_num_tx_queues) | |
104 | return dev->_tx[queue_id].pool; | |
105 | ||
106 | return NULL; | |
107 | } | |
108 | EXPORT_SYMBOL(xsk_get_pool_from_qid); | |
109 | ||
110 | void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id) | |
111 | { | |
b425e24a | 112 | if (queue_id < dev->num_rx_queues) |
1c1efc2a | 113 | dev->_rx[queue_id].pool = NULL; |
b425e24a | 114 | if (queue_id < dev->num_tx_queues) |
1c1efc2a MK |
115 | dev->_tx[queue_id].pool = NULL; |
116 | } | |
117 | ||
118 | /* The buffer pool is stored both in the _rx struct and the _tx struct as we do | |
119 | * not know if the device has more tx queues than rx, or the opposite. | |
120 | * This might also change during run time. | |
121 | */ | |
122 | int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool, | |
123 | u16 queue_id) | |
124 | { | |
125 | if (queue_id >= max_t(unsigned int, | |
126 | dev->real_num_rx_queues, | |
127 | dev->real_num_tx_queues)) | |
128 | return -EINVAL; | |
129 | ||
130 | if (queue_id < dev->real_num_rx_queues) | |
131 | dev->_rx[queue_id].pool = pool; | |
132 | if (queue_id < dev->real_num_tx_queues) | |
133 | dev->_tx[queue_id].pool = pool; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
556444c4 MF |
138 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff_xsk *xskb, u32 len, |
139 | u32 flags) | |
c05cd364 | 140 | { |
2b43470a BT |
141 | u64 addr; |
142 | int err; | |
c05cd364 | 143 | |
2b43470a | 144 | addr = xp_get_handle(xskb); |
63a64a56 | 145 | err = xskq_prod_reserve_desc(xs->rx, addr, len, flags); |
2b43470a | 146 | if (err) { |
8aa5a335 | 147 | xs->rx_queue_full++; |
2b43470a | 148 | return err; |
c05cd364 KL |
149 | } |
150 | ||
2b43470a BT |
151 | xp_release(xskb); |
152 | return 0; | |
c05cd364 KL |
153 | } |
154 | ||
556444c4 MF |
155 | static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
156 | { | |
157 | struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); | |
158 | ||
159 | return __xsk_rcv_zc(xs, xskb, len, 0); | |
160 | } | |
161 | ||
80462775 TS |
162 | static void *xsk_copy_xdp_start(struct xdp_buff *from) |
163 | { | |
164 | if (unlikely(xdp_data_meta_unsupported(from))) | |
165 | return from->data; | |
166 | else | |
167 | return from->data_meta; | |
168 | } | |
18baed26 | 169 | |
80462775 TS |
170 | static u32 xsk_copy_xdp(void *to, void **from, u32 to_len, |
171 | u32 *from_len, skb_frag_t **frag, u32 rem) | |
172 | { | |
173 | u32 copied = 0; | |
174 | ||
175 | while (1) { | |
176 | u32 copy_len = min_t(u32, *from_len, to_len); | |
177 | ||
178 | memcpy(to, *from, copy_len); | |
179 | copied += copy_len; | |
180 | if (rem == copied) | |
181 | return copied; | |
182 | ||
183 | if (*from_len == copy_len) { | |
184 | *from = skb_frag_address(*frag); | |
185 | *from_len = skb_frag_size((*frag)++); | |
186 | } else { | |
187 | *from += copy_len; | |
188 | *from_len -= copy_len; | |
189 | } | |
190 | if (to_len == copy_len) | |
191 | return copied; | |
192 | ||
193 | to_len -= copy_len; | |
194 | to += copy_len; | |
195 | } | |
c497176c BT |
196 | } |
197 | ||
faa91b83 | 198 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 199 | { |
80462775 TS |
200 | u32 frame_size = xsk_pool_get_rx_frame_size(xs->pool); |
201 | void *copy_from = xsk_copy_xdp_start(xdp), *copy_to; | |
202 | u32 from_len, meta_len, rem, num_desc; | |
556444c4 | 203 | struct xdp_buff_xsk *xskb; |
2b43470a | 204 | struct xdp_buff *xsk_xdp; |
80462775 TS |
205 | skb_frag_t *frag; |
206 | ||
207 | from_len = xdp->data_end - copy_from; | |
208 | meta_len = xdp->data - copy_from; | |
209 | rem = len + meta_len; | |
210 | ||
211 | if (len <= frame_size && !xdp_buff_has_frags(xdp)) { | |
212 | int err; | |
213 | ||
214 | xsk_xdp = xsk_buff_alloc(xs->pool); | |
215 | if (!xsk_xdp) { | |
216 | xs->rx_dropped++; | |
217 | return -ENOMEM; | |
218 | } | |
219 | memcpy(xsk_xdp->data - meta_len, copy_from, rem); | |
220 | xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp); | |
221 | err = __xsk_rcv_zc(xs, xskb, len, 0); | |
222 | if (err) { | |
223 | xsk_buff_free(xsk_xdp); | |
224 | return err; | |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
2b43470a | 229 | |
80462775 TS |
230 | num_desc = (len - 1) / frame_size + 1; |
231 | ||
232 | if (!xsk_buff_can_alloc(xs->pool, num_desc)) { | |
173d3adb | 233 | xs->rx_dropped++; |
c6c1f11b | 234 | return -ENOMEM; |
2b43470a | 235 | } |
80462775 TS |
236 | if (xskq_prod_nb_free(xs->rx, num_desc) < num_desc) { |
237 | xs->rx_queue_full++; | |
238 | return -ENOBUFS; | |
239 | } | |
c497176c | 240 | |
80462775 TS |
241 | if (xdp_buff_has_frags(xdp)) { |
242 | struct skb_shared_info *sinfo; | |
243 | ||
244 | sinfo = xdp_get_shared_info_from_buff(xdp); | |
245 | frag = &sinfo->frags[0]; | |
2b43470a | 246 | } |
80462775 TS |
247 | |
248 | do { | |
249 | u32 to_len = frame_size + meta_len; | |
250 | u32 copied; | |
251 | ||
252 | xsk_xdp = xsk_buff_alloc(xs->pool); | |
253 | copy_to = xsk_xdp->data - meta_len; | |
254 | ||
255 | copied = xsk_copy_xdp(copy_to, ©_from, to_len, &from_len, &frag, rem); | |
256 | rem -= copied; | |
257 | ||
258 | xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp); | |
259 | __xsk_rcv_zc(xs, xskb, copied - meta_len, rem ? XDP_PKT_CONTD : 0); | |
260 | meta_len = 0; | |
261 | } while (rem); | |
262 | ||
2b43470a | 263 | return 0; |
c497176c BT |
264 | } |
265 | ||
3413f041 XZ |
266 | static bool xsk_tx_writeable(struct xdp_sock *xs) |
267 | { | |
268 | if (xskq_cons_present_entries(xs->tx) > xs->tx->nentries / 2) | |
269 | return false; | |
270 | ||
271 | return true; | |
272 | } | |
273 | ||
42fddcc7 BT |
274 | static bool xsk_is_bound(struct xdp_sock *xs) |
275 | { | |
276 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
277 | /* Matches smp_wmb() in bind(). */ | |
278 | smp_rmb(); | |
279 | return true; | |
280 | } | |
281 | return false; | |
282 | } | |
283 | ||
faa91b83 | 284 | static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
173d3adb | 285 | { |
42fddcc7 | 286 | if (!xsk_is_bound(xs)) |
2be4a677 | 287 | return -ENXIO; |
42fddcc7 | 288 | |
173d3adb BT |
289 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
290 | return -EINVAL; | |
291 | ||
80462775 | 292 | if (len > xsk_pool_get_rx_frame_size(xs->pool) && !xs->sg) { |
faa91b83 TS |
293 | xs->rx_dropped++; |
294 | return -ENOSPC; | |
295 | } | |
296 | ||
b02e5a0e | 297 | sk_mark_napi_id_once_xdp(&xs->sk, xdp); |
458f7272 | 298 | return 0; |
173d3adb BT |
299 | } |
300 | ||
d817991c | 301 | static void xsk_flush(struct xdp_sock *xs) |
c497176c | 302 | { |
59e35e55 | 303 | xskq_prod_submit(xs->rx); |
7361f9c3 | 304 | __xskq_cons_release(xs->pool->fq); |
43a825af | 305 | sock_def_readable(&xs->sk); |
c497176c BT |
306 | } |
307 | ||
308 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
309 | { | |
faa91b83 | 310 | u32 len = xdp_get_buff_len(xdp); |
c497176c BT |
311 | int err; |
312 | ||
bf0bdd13 | 313 | spin_lock_bh(&xs->rx_lock); |
faa91b83 | 314 | err = xsk_rcv_check(xs, xdp, len); |
458f7272 | 315 | if (!err) { |
faa91b83 | 316 | err = __xsk_rcv(xs, xdp, len); |
458f7272 BT |
317 | xsk_flush(xs); |
318 | } | |
bf0bdd13 | 319 | spin_unlock_bh(&xs->rx_lock); |
c497176c BT |
320 | return err; |
321 | } | |
322 | ||
458f7272 BT |
323 | static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
324 | { | |
faa91b83 | 325 | u32 len = xdp_get_buff_len(xdp); |
458f7272 | 326 | int err; |
458f7272 | 327 | |
faa91b83 | 328 | err = xsk_rcv_check(xs, xdp, len); |
458f7272 BT |
329 | if (err) |
330 | return err; | |
331 | ||
332 | if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { | |
333 | len = xdp->data_end - xdp->data; | |
556444c4 | 334 | return xsk_rcv_zc(xs, xdp, len); |
458f7272 BT |
335 | } |
336 | ||
faa91b83 | 337 | err = __xsk_rcv(xs, xdp, len); |
458f7272 BT |
338 | if (!err) |
339 | xdp_return_buff(xdp); | |
340 | return err; | |
341 | } | |
342 | ||
e312b9e7 | 343 | int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
d817991c | 344 | { |
e312b9e7 | 345 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
346 | int err; |
347 | ||
458f7272 | 348 | err = xsk_rcv(xs, xdp); |
d817991c BT |
349 | if (err) |
350 | return err; | |
351 | ||
352 | if (!xs->flush_node.prev) | |
353 | list_add(&xs->flush_node, flush_list); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
e312b9e7 | 358 | void __xsk_map_flush(void) |
d817991c | 359 | { |
e312b9e7 | 360 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
361 | struct xdp_sock *xs, *tmp; |
362 | ||
363 | list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { | |
364 | xsk_flush(xs); | |
365 | __list_del_clearprev(&xs->flush_node); | |
366 | } | |
367 | } | |
368 | ||
c4655761 | 369 | void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries) |
ac98d8aa | 370 | { |
7361f9c3 | 371 | xskq_prod_submit_n(pool->cq, nb_entries); |
ac98d8aa | 372 | } |
c4655761 | 373 | EXPORT_SYMBOL(xsk_tx_completed); |
ac98d8aa | 374 | |
c4655761 | 375 | void xsk_tx_release(struct xsk_buff_pool *pool) |
ac98d8aa MK |
376 | { |
377 | struct xdp_sock *xs; | |
378 | ||
379 | rcu_read_lock(); | |
a5aa8e52 | 380 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
30744a68 | 381 | __xskq_cons_release(xs->tx); |
3413f041 XZ |
382 | if (xsk_tx_writeable(xs)) |
383 | xs->sk.sk_write_space(&xs->sk); | |
ac98d8aa MK |
384 | } |
385 | rcu_read_unlock(); | |
386 | } | |
c4655761 | 387 | EXPORT_SYMBOL(xsk_tx_release); |
ac98d8aa | 388 | |
c4655761 | 389 | bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) |
ac98d8aa | 390 | { |
ac98d8aa MK |
391 | struct xdp_sock *xs; |
392 | ||
393 | rcu_read_lock(); | |
a5aa8e52 | 394 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
1c1efc2a | 395 | if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { |
cf24f5a5 TS |
396 | if (xskq_has_descs(xs->tx)) |
397 | xskq_cons_release(xs->tx); | |
ac98d8aa | 398 | continue; |
8aa5a335 | 399 | } |
ac98d8aa | 400 | |
0a05861f | 401 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
402 | * Reserve space in the completion queue and only proceed |
403 | * if there is space in it. This avoids having to implement | |
404 | * any buffering in the Tx path. | |
405 | */ | |
7361f9c3 | 406 | if (xskq_prod_reserve_addr(pool->cq, desc->addr)) |
ac98d8aa MK |
407 | goto out; |
408 | ||
c5ed924b | 409 | xskq_cons_release(xs->tx); |
ac98d8aa MK |
410 | rcu_read_unlock(); |
411 | return true; | |
412 | } | |
413 | ||
414 | out: | |
415 | rcu_read_unlock(); | |
416 | return false; | |
417 | } | |
c4655761 | 418 | EXPORT_SYMBOL(xsk_tx_peek_desc); |
ac98d8aa | 419 | |
d1bc532e | 420 | static u32 xsk_tx_peek_release_fallback(struct xsk_buff_pool *pool, u32 max_entries) |
9349eb3a | 421 | { |
d1bc532e | 422 | struct xdp_desc *descs = pool->tx_descs; |
9349eb3a MK |
423 | u32 nb_pkts = 0; |
424 | ||
425 | while (nb_pkts < max_entries && xsk_tx_peek_desc(pool, &descs[nb_pkts])) | |
426 | nb_pkts++; | |
427 | ||
428 | xsk_tx_release(pool); | |
429 | return nb_pkts; | |
430 | } | |
431 | ||
c00c4461 | 432 | u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 nb_pkts) |
9349eb3a MK |
433 | { |
434 | struct xdp_sock *xs; | |
9349eb3a MK |
435 | |
436 | rcu_read_lock(); | |
437 | if (!list_is_singular(&pool->xsk_tx_list)) { | |
438 | /* Fallback to the non-batched version */ | |
439 | rcu_read_unlock(); | |
c00c4461 | 440 | return xsk_tx_peek_release_fallback(pool, nb_pkts); |
9349eb3a MK |
441 | } |
442 | ||
443 | xs = list_first_or_null_rcu(&pool->xsk_tx_list, struct xdp_sock, tx_list); | |
444 | if (!xs) { | |
445 | nb_pkts = 0; | |
446 | goto out; | |
447 | } | |
448 | ||
c00c4461 | 449 | nb_pkts = xskq_cons_nb_entries(xs->tx, nb_pkts); |
9349eb3a MK |
450 | |
451 | /* This is the backpressure mechanism for the Tx path. Try to | |
452 | * reserve space in the completion queue for all packets, but | |
453 | * if there are fewer slots available, just process that many | |
454 | * packets. This avoids having to implement any buffering in | |
455 | * the Tx path. | |
456 | */ | |
c00c4461 | 457 | nb_pkts = xskq_prod_nb_free(pool->cq, nb_pkts); |
9349eb3a MK |
458 | if (!nb_pkts) |
459 | goto out; | |
460 | ||
c00c4461 MF |
461 | nb_pkts = xskq_cons_read_desc_batch(xs->tx, pool, nb_pkts); |
462 | if (!nb_pkts) { | |
463 | xs->tx->queue_empty_descs++; | |
464 | goto out; | |
465 | } | |
466 | ||
9349eb3a | 467 | __xskq_cons_release(xs->tx); |
c00c4461 | 468 | xskq_prod_write_addr_batch(pool->cq, pool->tx_descs, nb_pkts); |
9349eb3a MK |
469 | xs->sk.sk_write_space(&xs->sk); |
470 | ||
471 | out: | |
472 | rcu_read_unlock(); | |
473 | return nb_pkts; | |
474 | } | |
475 | EXPORT_SYMBOL(xsk_tx_peek_release_desc_batch); | |
476 | ||
06870682 | 477 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 478 | { |
ac98d8aa | 479 | struct net_device *dev = xs->dev; |
06870682 | 480 | |
18b1ab7a | 481 | return dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); |
ac98d8aa MK |
482 | } |
483 | ||
b7f72a30 TS |
484 | static int xsk_cq_reserve_addr_locked(struct xdp_sock *xs, u64 addr) |
485 | { | |
486 | unsigned long flags; | |
487 | int ret; | |
488 | ||
489 | spin_lock_irqsave(&xs->pool->cq_lock, flags); | |
490 | ret = xskq_prod_reserve_addr(xs->pool->cq, addr); | |
491 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
496 | static void xsk_cq_submit_locked(struct xdp_sock *xs, u32 n) | |
497 | { | |
498 | unsigned long flags; | |
499 | ||
500 | spin_lock_irqsave(&xs->pool->cq_lock, flags); | |
501 | xskq_prod_submit_n(xs->pool->cq, n); | |
502 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
503 | } | |
504 | ||
505 | static void xsk_cq_cancel_locked(struct xdp_sock *xs, u32 n) | |
35fcde7f | 506 | { |
a9744f7c | 507 | unsigned long flags; |
35fcde7f | 508 | |
f09ced40 | 509 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
b7f72a30 | 510 | xskq_prod_cancel_n(xs->pool->cq, n); |
f09ced40 | 511 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
b7f72a30 | 512 | } |
35fcde7f | 513 | |
b7f72a30 TS |
514 | static u32 xsk_get_num_desc(struct sk_buff *skb) |
515 | { | |
516 | return skb ? (long)skb_shinfo(skb)->destructor_arg : 0; | |
517 | } | |
518 | ||
519 | static void xsk_destruct_skb(struct sk_buff *skb) | |
520 | { | |
521 | xsk_cq_submit_locked(xdp_sk(skb->sk), xsk_get_num_desc(skb)); | |
35fcde7f MK |
522 | sock_wfree(skb); |
523 | } | |
524 | ||
b7f72a30 TS |
525 | static void xsk_set_destructor_arg(struct sk_buff *skb) |
526 | { | |
527 | long num = xsk_get_num_desc(xdp_sk(skb->sk)->skb) + 1; | |
528 | ||
529 | skb_shinfo(skb)->destructor_arg = (void *)num; | |
530 | } | |
531 | ||
532 | static void xsk_consume_skb(struct sk_buff *skb) | |
533 | { | |
534 | struct xdp_sock *xs = xdp_sk(skb->sk); | |
535 | ||
536 | skb->destructor = sock_wfree; | |
537 | xsk_cq_cancel_locked(xs, xsk_get_num_desc(skb)); | |
538 | /* Free skb without triggering the perf drop trace */ | |
539 | consume_skb(skb); | |
540 | xs->skb = NULL; | |
541 | } | |
542 | ||
cf24f5a5 TS |
543 | static void xsk_drop_skb(struct sk_buff *skb) |
544 | { | |
545 | xdp_sk(skb->sk)->tx->invalid_descs += xsk_get_num_desc(skb); | |
546 | xsk_consume_skb(skb); | |
547 | } | |
548 | ||
9c8f21e6 XZ |
549 | static struct sk_buff *xsk_build_skb_zerocopy(struct xdp_sock *xs, |
550 | struct xdp_desc *desc) | |
551 | { | |
552 | struct xsk_buff_pool *pool = xs->pool; | |
553 | u32 hr, len, ts, offset, copy, copied; | |
cf24f5a5 | 554 | struct sk_buff *skb = xs->skb; |
9c8f21e6 XZ |
555 | struct page *page; |
556 | void *buffer; | |
557 | int err, i; | |
558 | u64 addr; | |
559 | ||
cf24f5a5 TS |
560 | if (!skb) { |
561 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(xs->dev->needed_headroom)); | |
9c8f21e6 | 562 | |
cf24f5a5 TS |
563 | skb = sock_alloc_send_skb(&xs->sk, hr, 1, &err); |
564 | if (unlikely(!skb)) | |
565 | return ERR_PTR(err); | |
9c8f21e6 | 566 | |
cf24f5a5 TS |
567 | skb_reserve(skb, hr); |
568 | } | |
9c8f21e6 XZ |
569 | |
570 | addr = desc->addr; | |
571 | len = desc->len; | |
572 | ts = pool->unaligned ? len : pool->chunk_size; | |
573 | ||
574 | buffer = xsk_buff_raw_get_data(pool, addr); | |
575 | offset = offset_in_page(buffer); | |
576 | addr = buffer - pool->addrs; | |
577 | ||
cf24f5a5 TS |
578 | for (copied = 0, i = skb_shinfo(skb)->nr_frags; copied < len; i++) { |
579 | if (unlikely(i >= MAX_SKB_FRAGS)) | |
580 | return ERR_PTR(-EFAULT); | |
581 | ||
9c8f21e6 XZ |
582 | page = pool->umem->pgs[addr >> PAGE_SHIFT]; |
583 | get_page(page); | |
584 | ||
585 | copy = min_t(u32, PAGE_SIZE - offset, len - copied); | |
586 | skb_fill_page_desc(skb, i, page, offset, copy); | |
587 | ||
588 | copied += copy; | |
589 | addr += copy; | |
590 | offset = 0; | |
591 | } | |
592 | ||
593 | skb->len += len; | |
594 | skb->data_len += len; | |
595 | skb->truesize += ts; | |
596 | ||
597 | refcount_add(ts, &xs->sk.sk_wmem_alloc); | |
598 | ||
599 | return skb; | |
600 | } | |
601 | ||
602 | static struct sk_buff *xsk_build_skb(struct xdp_sock *xs, | |
603 | struct xdp_desc *desc) | |
604 | { | |
605 | struct net_device *dev = xs->dev; | |
cf24f5a5 TS |
606 | struct sk_buff *skb = xs->skb; |
607 | int err; | |
9c8f21e6 XZ |
608 | |
609 | if (dev->priv_flags & IFF_TX_SKB_NO_LINEAR) { | |
610 | skb = xsk_build_skb_zerocopy(xs, desc); | |
cf24f5a5 TS |
611 | if (IS_ERR(skb)) { |
612 | err = PTR_ERR(skb); | |
613 | goto free_err; | |
614 | } | |
9c8f21e6 XZ |
615 | } else { |
616 | u32 hr, tr, len; | |
617 | void *buffer; | |
9c8f21e6 | 618 | |
cf24f5a5 | 619 | buffer = xsk_buff_raw_get_data(xs->pool, desc->addr); |
9c8f21e6 XZ |
620 | len = desc->len; |
621 | ||
cf24f5a5 TS |
622 | if (!skb) { |
623 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(dev->needed_headroom)); | |
624 | tr = dev->needed_tailroom; | |
625 | skb = sock_alloc_send_skb(&xs->sk, hr + len + tr, 1, &err); | |
626 | if (unlikely(!skb)) | |
627 | goto free_err; | |
9c8f21e6 | 628 | |
cf24f5a5 TS |
629 | skb_reserve(skb, hr); |
630 | skb_put(skb, len); | |
9c8f21e6 | 631 | |
cf24f5a5 TS |
632 | err = skb_store_bits(skb, 0, buffer, len); |
633 | if (unlikely(err)) | |
634 | goto free_err; | |
635 | } else { | |
636 | int nr_frags = skb_shinfo(skb)->nr_frags; | |
637 | struct page *page; | |
638 | u8 *vaddr; | |
639 | ||
640 | if (unlikely(nr_frags == (MAX_SKB_FRAGS - 1) && xp_mb_desc(desc))) { | |
641 | err = -EFAULT; | |
642 | goto free_err; | |
643 | } | |
644 | ||
645 | page = alloc_page(xs->sk.sk_allocation); | |
646 | if (unlikely(!page)) { | |
647 | err = -EAGAIN; | |
648 | goto free_err; | |
649 | } | |
650 | ||
651 | vaddr = kmap_local_page(page); | |
652 | memcpy(vaddr, buffer, len); | |
653 | kunmap_local(vaddr); | |
654 | ||
655 | skb_add_rx_frag(skb, nr_frags, page, 0, len, 0); | |
9c8f21e6 XZ |
656 | } |
657 | } | |
658 | ||
659 | skb->dev = dev; | |
660 | skb->priority = xs->sk.sk_priority; | |
661 | skb->mark = xs->sk.sk_mark; | |
9c8f21e6 | 662 | skb->destructor = xsk_destruct_skb; |
b7f72a30 | 663 | xsk_set_destructor_arg(skb); |
9c8f21e6 XZ |
664 | |
665 | return skb; | |
cf24f5a5 TS |
666 | |
667 | free_err: | |
668 | if (err == -EAGAIN) { | |
669 | xsk_cq_cancel_locked(xs, 1); | |
670 | } else { | |
671 | xsk_set_destructor_arg(skb); | |
672 | xsk_drop_skb(skb); | |
673 | xskq_cons_release(xs->tx); | |
674 | } | |
675 | ||
676 | return ERR_PTR(err); | |
9c8f21e6 XZ |
677 | } |
678 | ||
1596dae2 | 679 | static int __xsk_generic_xmit(struct sock *sk) |
35fcde7f | 680 | { |
35fcde7f | 681 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 682 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
683 | bool sent_frame = false; |
684 | struct xdp_desc desc; | |
685 | struct sk_buff *skb; | |
686 | int err = 0; | |
687 | ||
35fcde7f MK |
688 | mutex_lock(&xs->mutex); |
689 | ||
18b1ab7a MK |
690 | /* Since we dropped the RCU read lock, the socket state might have changed. */ |
691 | if (unlikely(!xsk_is_bound(xs))) { | |
692 | err = -ENXIO; | |
693 | goto out; | |
694 | } | |
695 | ||
67571640 IM |
696 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
697 | goto out; | |
698 | ||
1c1efc2a | 699 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
35fcde7f MK |
700 | if (max_batch-- == 0) { |
701 | err = -EAGAIN; | |
702 | goto out; | |
703 | } | |
704 | ||
0a05861f | 705 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
706 | * Reserve space in the completion queue and only proceed |
707 | * if there is space in it. This avoids having to implement | |
708 | * any buffering in the Tx path. | |
709 | */ | |
b7f72a30 | 710 | if (xsk_cq_reserve_addr_locked(xs, desc.addr)) |
35fcde7f | 711 | goto out; |
35fcde7f | 712 | |
a6e944f2 CL |
713 | skb = xsk_build_skb(xs, &desc); |
714 | if (IS_ERR(skb)) { | |
715 | err = PTR_ERR(skb); | |
cf24f5a5 TS |
716 | if (err == -EAGAIN) |
717 | goto out; | |
718 | err = 0; | |
719 | continue; | |
720 | } | |
721 | ||
722 | xskq_cons_release(xs->tx); | |
723 | ||
724 | if (xp_mb_desc(&desc)) { | |
725 | xs->skb = skb; | |
726 | continue; | |
a6e944f2 CL |
727 | } |
728 | ||
36ccdf85 | 729 | err = __dev_direct_xmit(skb, xs->queue_id); |
642e450b MK |
730 | if (err == NETDEV_TX_BUSY) { |
731 | /* Tell user-space to retry the send */ | |
cf24f5a5 | 732 | xskq_cons_cancel_n(xs->tx, xsk_get_num_desc(skb)); |
b7f72a30 | 733 | xsk_consume_skb(skb); |
642e450b MK |
734 | err = -EAGAIN; |
735 | goto out; | |
736 | } | |
737 | ||
35fcde7f | 738 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
642e450b | 739 | if (err == NET_XMIT_DROP) { |
fe588685 MK |
740 | /* SKB completed but not sent */ |
741 | err = -EBUSY; | |
cf24f5a5 | 742 | xs->skb = NULL; |
35fcde7f MK |
743 | goto out; |
744 | } | |
745 | ||
746 | sent_frame = true; | |
cf24f5a5 | 747 | xs->skb = NULL; |
35fcde7f MK |
748 | } |
749 | ||
cf24f5a5 TS |
750 | if (xskq_has_descs(xs->tx)) { |
751 | if (xs->skb) | |
752 | xsk_drop_skb(xs->skb); | |
753 | xskq_cons_release(xs->tx); | |
754 | } | |
8aa5a335 | 755 | |
35fcde7f MK |
756 | out: |
757 | if (sent_frame) | |
3413f041 XZ |
758 | if (xsk_tx_writeable(xs)) |
759 | sk->sk_write_space(sk); | |
35fcde7f MK |
760 | |
761 | mutex_unlock(&xs->mutex); | |
762 | return err; | |
763 | } | |
764 | ||
1596dae2 | 765 | static int xsk_generic_xmit(struct sock *sk) |
df551058 | 766 | { |
18b1ab7a | 767 | int ret; |
df551058 | 768 | |
18b1ab7a MK |
769 | /* Drop the RCU lock since the SKB path might sleep. */ |
770 | rcu_read_unlock(); | |
1596dae2 | 771 | ret = __xsk_generic_xmit(sk); |
18b1ab7a MK |
772 | /* Reaquire RCU lock before going into common code. */ |
773 | rcu_read_lock(); | |
774 | ||
775 | return ret; | |
df551058 MK |
776 | } |
777 | ||
a0731952 BT |
778 | static bool xsk_no_wakeup(struct sock *sk) |
779 | { | |
780 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
781 | /* Prefer busy-polling, skip the wakeup. */ | |
782 | return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) && | |
783 | READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID; | |
784 | #else | |
785 | return false; | |
786 | #endif | |
787 | } | |
788 | ||
1596dae2 MF |
789 | static int xsk_check_common(struct xdp_sock *xs) |
790 | { | |
791 | if (unlikely(!xsk_is_bound(xs))) | |
792 | return -ENXIO; | |
793 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
794 | return -ENETDOWN; | |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
18b1ab7a | 799 | static int __xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
35fcde7f | 800 | { |
ac98d8aa | 801 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
802 | struct sock *sk = sock->sk; |
803 | struct xdp_sock *xs = xdp_sk(sk); | |
e3920818 | 804 | struct xsk_buff_pool *pool; |
1596dae2 | 805 | int err; |
35fcde7f | 806 | |
1596dae2 MF |
807 | err = xsk_check_common(xs); |
808 | if (err) | |
809 | return err; | |
df551058 | 810 | if (unlikely(need_wait)) |
ac98d8aa | 811 | return -EOPNOTSUPP; |
1596dae2 MF |
812 | if (unlikely(!xs->tx)) |
813 | return -ENOBUFS; | |
35fcde7f | 814 | |
ca2e1a62 MF |
815 | if (sk_can_busy_loop(sk)) { |
816 | if (xs->zc) | |
817 | __sk_mark_napi_id_once(sk, xsk_pool_get_napi_id(xs->pool)); | |
a0731952 | 818 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ |
ca2e1a62 | 819 | } |
a0731952 | 820 | |
8de8b71b | 821 | if (xs->zc && xsk_no_wakeup(sk)) |
a0731952 BT |
822 | return 0; |
823 | ||
e3920818 | 824 | pool = xs->pool; |
1596dae2 MF |
825 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) { |
826 | if (xs->zc) | |
827 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
828 | return xsk_generic_xmit(sk); | |
829 | } | |
e3920818 | 830 | return 0; |
35fcde7f MK |
831 | } |
832 | ||
18b1ab7a MK |
833 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
834 | { | |
835 | int ret; | |
836 | ||
837 | rcu_read_lock(); | |
838 | ret = __xsk_sendmsg(sock, m, total_len); | |
839 | rcu_read_unlock(); | |
840 | ||
841 | return ret; | |
842 | } | |
843 | ||
844 | static int __xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) | |
45a86681 BT |
845 | { |
846 | bool need_wait = !(flags & MSG_DONTWAIT); | |
847 | struct sock *sk = sock->sk; | |
848 | struct xdp_sock *xs = xdp_sk(sk); | |
1596dae2 | 849 | int err; |
45a86681 | 850 | |
1596dae2 MF |
851 | err = xsk_check_common(xs); |
852 | if (err) | |
853 | return err; | |
45a86681 BT |
854 | if (unlikely(!xs->rx)) |
855 | return -ENOBUFS; | |
45a86681 BT |
856 | if (unlikely(need_wait)) |
857 | return -EOPNOTSUPP; | |
858 | ||
a0731952 BT |
859 | if (sk_can_busy_loop(sk)) |
860 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ | |
861 | ||
862 | if (xsk_no_wakeup(sk)) | |
863 | return 0; | |
864 | ||
45a86681 BT |
865 | if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc) |
866 | return xsk_wakeup(xs, XDP_WAKEUP_RX); | |
867 | return 0; | |
35fcde7f MK |
868 | } |
869 | ||
18b1ab7a MK |
870 | static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) |
871 | { | |
872 | int ret; | |
873 | ||
874 | rcu_read_lock(); | |
875 | ret = __xsk_recvmsg(sock, m, len, flags); | |
876 | rcu_read_unlock(); | |
877 | ||
878 | return ret; | |
879 | } | |
880 | ||
5d946c5a | 881 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 882 | struct poll_table_struct *wait) |
c497176c | 883 | { |
f5da5418 | 884 | __poll_t mask = 0; |
df551058 MK |
885 | struct sock *sk = sock->sk; |
886 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 887 | struct xsk_buff_pool *pool; |
42fddcc7 | 888 | |
0706a78f MK |
889 | sock_poll_wait(file, sock, wait); |
890 | ||
18b1ab7a | 891 | rcu_read_lock(); |
1596dae2 MF |
892 | if (xsk_check_common(xs)) |
893 | goto skip_tx; | |
42fddcc7 | 894 | |
c2d3d6a4 | 895 | pool = xs->pool; |
77cd0d7b | 896 | |
c2d3d6a4 | 897 | if (pool->cached_need_wakeup) { |
06870682 | 898 | if (xs->zc) |
c2d3d6a4 | 899 | xsk_wakeup(xs, pool->cached_need_wakeup); |
1596dae2 | 900 | else if (xs->tx) |
df551058 | 901 | /* Poll needs to drive Tx also in copy mode */ |
1596dae2 | 902 | xsk_generic_xmit(sk); |
df551058 | 903 | } |
c497176c | 904 | |
1596dae2 | 905 | skip_tx: |
59e35e55 | 906 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 907 | mask |= EPOLLIN | EPOLLRDNORM; |
3413f041 | 908 | if (xs->tx && xsk_tx_writeable(xs)) |
5d946c5a | 909 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c | 910 | |
18b1ab7a | 911 | rcu_read_unlock(); |
c497176c BT |
912 | return mask; |
913 | } | |
914 | ||
b9b6b68e BT |
915 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
916 | bool umem_queue) | |
423f3832 MK |
917 | { |
918 | struct xsk_queue *q; | |
919 | ||
920 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
921 | return -EINVAL; | |
922 | ||
b9b6b68e | 923 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
924 | if (!q) |
925 | return -ENOMEM; | |
926 | ||
37b07693 BT |
927 | /* Make sure queue is ready before it can be seen by others */ |
928 | smp_wmb(); | |
94a99763 | 929 | WRITE_ONCE(*queue, q); |
423f3832 MK |
930 | return 0; |
931 | } | |
932 | ||
455302d1 IM |
933 | static void xsk_unbind_dev(struct xdp_sock *xs) |
934 | { | |
935 | struct net_device *dev = xs->dev; | |
936 | ||
42fddcc7 | 937 | if (xs->state != XSK_BOUND) |
455302d1 | 938 | return; |
42fddcc7 | 939 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
940 | |
941 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 942 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
943 | synchronize_net(); |
944 | dev_put(dev); | |
945 | } | |
946 | ||
0402acd6 | 947 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
782347b6 | 948 | struct xdp_sock __rcu ***map_entry) |
0402acd6 BT |
949 | { |
950 | struct xsk_map *map = NULL; | |
951 | struct xsk_map_node *node; | |
952 | ||
953 | *map_entry = NULL; | |
954 | ||
955 | spin_lock_bh(&xs->map_list_lock); | |
956 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
957 | node); | |
958 | if (node) { | |
bb1b25ca | 959 | bpf_map_inc(&node->map->map); |
0402acd6 BT |
960 | map = node->map; |
961 | *map_entry = node->map_entry; | |
962 | } | |
963 | spin_unlock_bh(&xs->map_list_lock); | |
964 | return map; | |
965 | } | |
966 | ||
967 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
968 | { | |
969 | /* This function removes the current XDP socket from all the | |
970 | * maps it resides in. We need to take extra care here, due to | |
971 | * the two locks involved. Each map has a lock synchronizing | |
972 | * updates to the entries, and each socket has a lock that | |
973 | * synchronizes access to the list of maps (map_list). For | |
974 | * deadlock avoidance the locks need to be taken in the order | |
975 | * "map lock"->"socket map list lock". We start off by | |
976 | * accessing the socket map list, and take a reference to the | |
977 | * map to guarantee existence between the | |
978 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
979 | * calls. Then we ask the map to remove the socket, which | |
980 | * tries to remove the socket from the map. Note that there | |
981 | * might be updates to the map between | |
982 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
983 | */ | |
782347b6 | 984 | struct xdp_sock __rcu **map_entry = NULL; |
0402acd6 BT |
985 | struct xsk_map *map; |
986 | ||
987 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
988 | xsk_map_try_sock_delete(map, xs, map_entry); | |
bb1b25ca | 989 | bpf_map_put(&map->map); |
0402acd6 BT |
990 | } |
991 | } | |
992 | ||
c0c77d8f BT |
993 | static int xsk_release(struct socket *sock) |
994 | { | |
995 | struct sock *sk = sock->sk; | |
965a9909 | 996 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
997 | struct net *net; |
998 | ||
999 | if (!sk) | |
1000 | return 0; | |
1001 | ||
1002 | net = sock_net(sk); | |
1003 | ||
cf24f5a5 TS |
1004 | if (xs->skb) |
1005 | xsk_drop_skb(xs->skb); | |
1006 | ||
1d0dc069 BT |
1007 | mutex_lock(&net->xdp.lock); |
1008 | sk_del_node_init_rcu(sk); | |
1009 | mutex_unlock(&net->xdp.lock); | |
1010 | ||
c0c77d8f | 1011 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
c0c77d8f | 1012 | |
0402acd6 | 1013 | xsk_delete_from_maps(xs); |
42fddcc7 | 1014 | mutex_lock(&xs->mutex); |
455302d1 | 1015 | xsk_unbind_dev(xs); |
42fddcc7 | 1016 | mutex_unlock(&xs->mutex); |
965a9909 | 1017 | |
541d7fdd BT |
1018 | xskq_destroy(xs->rx); |
1019 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
1020 | xskq_destroy(xs->fq_tmp); |
1021 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 1022 | |
c0c77d8f BT |
1023 | sock_orphan(sk); |
1024 | sock->sk = NULL; | |
1025 | ||
c0c77d8f BT |
1026 | sock_put(sk); |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
965a9909 MK |
1031 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
1032 | { | |
1033 | struct socket *sock; | |
1034 | int err; | |
1035 | ||
1036 | sock = sockfd_lookup(fd, &err); | |
1037 | if (!sock) | |
1038 | return ERR_PTR(-ENOTSOCK); | |
1039 | ||
1040 | if (sock->sk->sk_family != PF_XDP) { | |
1041 | sockfd_put(sock); | |
1042 | return ERR_PTR(-ENOPROTOOPT); | |
1043 | } | |
1044 | ||
1045 | return sock; | |
1046 | } | |
1047 | ||
7361f9c3 MK |
1048 | static bool xsk_validate_queues(struct xdp_sock *xs) |
1049 | { | |
1050 | return xs->fq_tmp && xs->cq_tmp; | |
1051 | } | |
1052 | ||
965a9909 MK |
1053 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
1054 | { | |
1055 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
1056 | struct sock *sk = sock->sk; | |
965a9909 | 1057 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 1058 | struct net_device *dev; |
f7306ace | 1059 | int bound_dev_if; |
173d3adb | 1060 | u32 flags, qid; |
965a9909 MK |
1061 | int err = 0; |
1062 | ||
1063 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
1064 | return -EINVAL; | |
1065 | if (sxdp->sxdp_family != AF_XDP) | |
1066 | return -EINVAL; | |
1067 | ||
f54ba391 | 1068 | flags = sxdp->sxdp_flags; |
77cd0d7b | 1069 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
81470b5c | 1070 | XDP_USE_NEED_WAKEUP | XDP_USE_SG)) |
f54ba391 BT |
1071 | return -EINVAL; |
1072 | ||
f7306ace IM |
1073 | bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); |
1074 | if (bound_dev_if && bound_dev_if != sxdp->sxdp_ifindex) | |
1075 | return -EINVAL; | |
1076 | ||
5464c3a0 | 1077 | rtnl_lock(); |
965a9909 | 1078 | mutex_lock(&xs->mutex); |
455302d1 | 1079 | if (xs->state != XSK_READY) { |
959b71db BT |
1080 | err = -EBUSY; |
1081 | goto out_release; | |
1082 | } | |
1083 | ||
965a9909 MK |
1084 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
1085 | if (!dev) { | |
1086 | err = -ENODEV; | |
1087 | goto out_release; | |
1088 | } | |
1089 | ||
f6145903 | 1090 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
1091 | err = -EINVAL; |
1092 | goto out_unlock; | |
1093 | } | |
1094 | ||
173d3adb | 1095 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
1096 | |
1097 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
1098 | struct xdp_sock *umem_xs; |
1099 | struct socket *sock; | |
1100 | ||
77cd0d7b | 1101 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
81470b5c | 1102 | (flags & XDP_USE_NEED_WAKEUP) || (flags & XDP_USE_SG)) { |
173d3adb BT |
1103 | /* Cannot specify flags for shared sockets. */ |
1104 | err = -EINVAL; | |
1105 | goto out_unlock; | |
1106 | } | |
1107 | ||
965a9909 MK |
1108 | if (xs->umem) { |
1109 | /* We have already our own. */ | |
1110 | err = -EINVAL; | |
1111 | goto out_unlock; | |
1112 | } | |
1113 | ||
1114 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
1115 | if (IS_ERR(sock)) { | |
1116 | err = PTR_ERR(sock); | |
1117 | goto out_unlock; | |
1118 | } | |
1119 | ||
1120 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 1121 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
1122 | err = -EBADF; |
1123 | sockfd_put(sock); | |
1124 | goto out_unlock; | |
42fddcc7 | 1125 | } |
965a9909 | 1126 | |
a1132430 MK |
1127 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
1128 | /* Share the umem with another socket on another qid | |
1129 | * and/or device. | |
1130 | */ | |
b5aea28d MK |
1131 | xs->pool = xp_create_and_assign_umem(xs, |
1132 | umem_xs->umem); | |
1133 | if (!xs->pool) { | |
1fd17c8c | 1134 | err = -ENOMEM; |
b5aea28d MK |
1135 | sockfd_put(sock); |
1136 | goto out_unlock; | |
1137 | } | |
1138 | ||
60240bc2 JM |
1139 | err = xp_assign_dev_shared(xs->pool, umem_xs, dev, |
1140 | qid); | |
b5aea28d MK |
1141 | if (err) { |
1142 | xp_destroy(xs->pool); | |
83cf5c68 | 1143 | xs->pool = NULL; |
b5aea28d MK |
1144 | sockfd_put(sock); |
1145 | goto out_unlock; | |
1146 | } | |
1147 | } else { | |
1148 | /* Share the buffer pool with the other socket. */ | |
1149 | if (xs->fq_tmp || xs->cq_tmp) { | |
1150 | /* Do not allow setting your own fq or cq. */ | |
1151 | err = -EINVAL; | |
1152 | sockfd_put(sock); | |
1153 | goto out_unlock; | |
1154 | } | |
1155 | ||
1156 | xp_get_pool(umem_xs->pool); | |
1157 | xs->pool = umem_xs->pool; | |
ba3beec2 MF |
1158 | |
1159 | /* If underlying shared umem was created without Tx | |
1160 | * ring, allocate Tx descs array that Tx batching API | |
1161 | * utilizes | |
1162 | */ | |
1163 | if (xs->tx && !xs->pool->tx_descs) { | |
1164 | err = xp_alloc_tx_descs(xs->pool, xs); | |
1165 | if (err) { | |
1166 | xp_put_pool(xs->pool); | |
1167 | sockfd_put(sock); | |
1168 | goto out_unlock; | |
1169 | } | |
1170 | } | |
b5aea28d MK |
1171 | } |
1172 | ||
965a9909 | 1173 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 1174 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 1175 | sockfd_put(sock); |
7361f9c3 | 1176 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
1177 | err = -EINVAL; |
1178 | goto out_unlock; | |
c497176c BT |
1179 | } else { |
1180 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
1181 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
1182 | if (!xs->pool) { | |
1183 | err = -ENOMEM; | |
173d3adb | 1184 | goto out_unlock; |
1c1efc2a MK |
1185 | } |
1186 | ||
1187 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
1188 | if (err) { | |
1189 | xp_destroy(xs->pool); | |
1190 | xs->pool = NULL; | |
1c1efc2a MK |
1191 | goto out_unlock; |
1192 | } | |
965a9909 MK |
1193 | } |
1194 | ||
8bee6833 MK |
1195 | /* FQ and CQ are now owned by the buffer pool and cleaned up with it. */ |
1196 | xs->fq_tmp = NULL; | |
1197 | xs->cq_tmp = NULL; | |
1198 | ||
965a9909 | 1199 | xs->dev = dev; |
ac98d8aa | 1200 | xs->zc = xs->umem->zc; |
81470b5c | 1201 | xs->sg = !!(flags & XDP_USE_SG); |
ac98d8aa | 1202 | xs->queue_id = qid; |
a5aa8e52 | 1203 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
1204 | |
1205 | out_unlock: | |
42fddcc7 | 1206 | if (err) { |
965a9909 | 1207 | dev_put(dev); |
42fddcc7 BT |
1208 | } else { |
1209 | /* Matches smp_rmb() in bind() for shared umem | |
1210 | * sockets, and xsk_is_bound(). | |
1211 | */ | |
1212 | smp_wmb(); | |
1213 | WRITE_ONCE(xs->state, XSK_BOUND); | |
1214 | } | |
965a9909 MK |
1215 | out_release: |
1216 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 1217 | rtnl_unlock(); |
965a9909 MK |
1218 | return err; |
1219 | } | |
1220 | ||
c05cd364 KL |
1221 | struct xdp_umem_reg_v1 { |
1222 | __u64 addr; /* Start of packet data area */ | |
1223 | __u64 len; /* Length of packet data area */ | |
1224 | __u32 chunk_size; | |
1225 | __u32 headroom; | |
1226 | }; | |
1227 | ||
c0c77d8f | 1228 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 1229 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
1230 | { |
1231 | struct sock *sk = sock->sk; | |
1232 | struct xdp_sock *xs = xdp_sk(sk); | |
1233 | int err; | |
1234 | ||
1235 | if (level != SOL_XDP) | |
1236 | return -ENOPROTOOPT; | |
1237 | ||
1238 | switch (optname) { | |
b9b6b68e | 1239 | case XDP_RX_RING: |
f6145903 | 1240 | case XDP_TX_RING: |
b9b6b68e BT |
1241 | { |
1242 | struct xsk_queue **q; | |
1243 | int entries; | |
1244 | ||
1245 | if (optlen < sizeof(entries)) | |
1246 | return -EINVAL; | |
a7b75c5a | 1247 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
1248 | return -EFAULT; |
1249 | ||
1250 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1251 | if (xs->state != XSK_READY) { |
1252 | mutex_unlock(&xs->mutex); | |
1253 | return -EBUSY; | |
1254 | } | |
f6145903 | 1255 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 1256 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
1257 | if (!err && optname == XDP_TX_RING) |
1258 | /* Tx needs to be explicitly woken up the first time */ | |
1259 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
1260 | mutex_unlock(&xs->mutex); |
1261 | return err; | |
1262 | } | |
c0c77d8f BT |
1263 | case XDP_UMEM_REG: |
1264 | { | |
c05cd364 KL |
1265 | size_t mr_size = sizeof(struct xdp_umem_reg); |
1266 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
1267 | struct xdp_umem *umem; |
1268 | ||
c05cd364 KL |
1269 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
1270 | return -EINVAL; | |
1271 | else if (optlen < sizeof(mr)) | |
1272 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
1273 | ||
a7b75c5a | 1274 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
1275 | return -EFAULT; |
1276 | ||
1277 | mutex_lock(&xs->mutex); | |
455302d1 | 1278 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
1279 | mutex_unlock(&xs->mutex); |
1280 | return -EBUSY; | |
1281 | } | |
c0c77d8f | 1282 | |
a49049ea BT |
1283 | umem = xdp_umem_create(&mr); |
1284 | if (IS_ERR(umem)) { | |
c0c77d8f | 1285 | mutex_unlock(&xs->mutex); |
a49049ea | 1286 | return PTR_ERR(umem); |
c0c77d8f BT |
1287 | } |
1288 | ||
1289 | /* Make sure umem is ready before it can be seen by others */ | |
1290 | smp_wmb(); | |
9764f4b3 | 1291 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
1292 | mutex_unlock(&xs->mutex); |
1293 | return 0; | |
1294 | } | |
423f3832 | 1295 | case XDP_UMEM_FILL_RING: |
fe230832 | 1296 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
1297 | { |
1298 | struct xsk_queue **q; | |
1299 | int entries; | |
1300 | ||
a7b75c5a | 1301 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
1302 | return -EFAULT; |
1303 | ||
1304 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1305 | if (xs->state != XSK_READY) { |
1306 | mutex_unlock(&xs->mutex); | |
1307 | return -EBUSY; | |
1308 | } | |
a49049ea | 1309 | |
7361f9c3 MK |
1310 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
1311 | &xs->cq_tmp; | |
b9b6b68e | 1312 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
1313 | mutex_unlock(&xs->mutex); |
1314 | return err; | |
1315 | } | |
c0c77d8f BT |
1316 | default: |
1317 | break; | |
1318 | } | |
1319 | ||
1320 | return -ENOPROTOOPT; | |
1321 | } | |
1322 | ||
77cd0d7b MK |
1323 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
1324 | { | |
1325 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
1326 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
1327 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
1328 | } | |
1329 | ||
1330 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
1331 | { | |
1332 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
1333 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
1334 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
1335 | } | |
1336 | ||
8aa5a335 CL |
1337 | struct xdp_statistics_v1 { |
1338 | __u64 rx_dropped; | |
1339 | __u64 rx_invalid_descs; | |
1340 | __u64 tx_invalid_descs; | |
1341 | }; | |
1342 | ||
af75d9e0 MK |
1343 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
1344 | char __user *optval, int __user *optlen) | |
1345 | { | |
1346 | struct sock *sk = sock->sk; | |
1347 | struct xdp_sock *xs = xdp_sk(sk); | |
1348 | int len; | |
1349 | ||
1350 | if (level != SOL_XDP) | |
1351 | return -ENOPROTOOPT; | |
1352 | ||
1353 | if (get_user(len, optlen)) | |
1354 | return -EFAULT; | |
1355 | if (len < 0) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | switch (optname) { | |
1359 | case XDP_STATISTICS: | |
1360 | { | |
3c4f850e | 1361 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
1362 | bool extra_stats = true; |
1363 | size_t stats_size; | |
af75d9e0 | 1364 | |
8aa5a335 | 1365 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 1366 | return -EINVAL; |
8aa5a335 CL |
1367 | } else if (len < sizeof(stats)) { |
1368 | extra_stats = false; | |
1369 | stats_size = sizeof(struct xdp_statistics_v1); | |
1370 | } else { | |
1371 | stats_size = sizeof(stats); | |
1372 | } | |
af75d9e0 MK |
1373 | |
1374 | mutex_lock(&xs->mutex); | |
1375 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
1376 | if (extra_stats) { |
1377 | stats.rx_ring_full = xs->rx_queue_full; | |
1378 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 1379 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
1380 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
1381 | } else { | |
1382 | stats.rx_dropped += xs->rx_queue_full; | |
1383 | } | |
af75d9e0 MK |
1384 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
1385 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
1386 | mutex_unlock(&xs->mutex); | |
1387 | ||
8aa5a335 | 1388 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 1389 | return -EFAULT; |
8aa5a335 | 1390 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
1391 | return -EFAULT; |
1392 | ||
1393 | return 0; | |
1394 | } | |
b3a9e0be BT |
1395 | case XDP_MMAP_OFFSETS: |
1396 | { | |
1397 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
1398 | struct xdp_mmap_offsets_v1 off_v1; |
1399 | bool flags_supported = true; | |
1400 | void *to_copy; | |
b3a9e0be | 1401 | |
77cd0d7b | 1402 | if (len < sizeof(off_v1)) |
b3a9e0be | 1403 | return -EINVAL; |
77cd0d7b MK |
1404 | else if (len < sizeof(off)) |
1405 | flags_supported = false; | |
1406 | ||
1407 | if (flags_supported) { | |
1408 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
1409 | * except for the flags field added to the end. | |
1410 | */ | |
1411 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1412 | &off.rx); | |
1413 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1414 | &off.tx); | |
1415 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1416 | &off.fr); | |
1417 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1418 | &off.cr); | |
1419 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
1420 | ptrs.flags); | |
1421 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
1422 | ptrs.flags); | |
1423 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
1424 | ptrs.flags); | |
1425 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
1426 | ptrs.flags); | |
1427 | ||
1428 | len = sizeof(off); | |
1429 | to_copy = &off; | |
1430 | } else { | |
1431 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
1432 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
1433 | xsk_enter_umem_offsets(&off_v1.fr); | |
1434 | xsk_enter_umem_offsets(&off_v1.cr); | |
1435 | ||
1436 | len = sizeof(off_v1); | |
1437 | to_copy = &off_v1; | |
1438 | } | |
b3a9e0be | 1439 | |
77cd0d7b | 1440 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
1441 | return -EFAULT; |
1442 | if (put_user(len, optlen)) | |
1443 | return -EFAULT; | |
1444 | ||
1445 | return 0; | |
1446 | } | |
2640d3c8 MM |
1447 | case XDP_OPTIONS: |
1448 | { | |
1449 | struct xdp_options opts = {}; | |
1450 | ||
1451 | if (len < sizeof(opts)) | |
1452 | return -EINVAL; | |
1453 | ||
1454 | mutex_lock(&xs->mutex); | |
1455 | if (xs->zc) | |
1456 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1457 | mutex_unlock(&xs->mutex); | |
1458 | ||
1459 | len = sizeof(opts); | |
1460 | if (copy_to_user(optval, &opts, len)) | |
1461 | return -EFAULT; | |
1462 | if (put_user(len, optlen)) | |
1463 | return -EFAULT; | |
1464 | ||
1465 | return 0; | |
1466 | } | |
af75d9e0 MK |
1467 | default: |
1468 | break; | |
1469 | } | |
1470 | ||
1471 | return -EOPNOTSUPP; | |
1472 | } | |
1473 | ||
423f3832 MK |
1474 | static int xsk_mmap(struct file *file, struct socket *sock, |
1475 | struct vm_area_struct *vma) | |
1476 | { | |
a5a16e43 | 1477 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1478 | unsigned long size = vma->vm_end - vma->vm_start; |
1479 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
5f5a7d8d | 1480 | int state = READ_ONCE(xs->state); |
423f3832 | 1481 | struct xsk_queue *q = NULL; |
423f3832 | 1482 | |
5f5a7d8d | 1483 | if (state != XSK_READY && state != XSK_BOUND) |
455302d1 IM |
1484 | return -EBUSY; |
1485 | ||
b9b6b68e | 1486 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1487 | q = READ_ONCE(xs->rx); |
f6145903 | 1488 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1489 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1490 | } else { |
e6762c8b MK |
1491 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1492 | smp_rmb(); | |
b9b6b68e | 1493 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
5f5a7d8d NG |
1494 | q = state == XSK_READY ? READ_ONCE(xs->fq_tmp) : |
1495 | READ_ONCE(xs->pool->fq); | |
fe230832 | 1496 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
5f5a7d8d NG |
1497 | q = state == XSK_READY ? READ_ONCE(xs->cq_tmp) : |
1498 | READ_ONCE(xs->pool->cq); | |
b9b6b68e | 1499 | } |
423f3832 MK |
1500 | |
1501 | if (!q) | |
1502 | return -EINVAL; | |
1503 | ||
e6762c8b MK |
1504 | /* Matches the smp_wmb() in xsk_init_queue */ |
1505 | smp_rmb(); | |
9f78bf33 | 1506 | if (size > q->ring_vmalloc_size) |
423f3832 MK |
1507 | return -EINVAL; |
1508 | ||
9f78bf33 | 1509 | return remap_vmalloc_range(vma, q->ring, 0); |
423f3832 MK |
1510 | } |
1511 | ||
455302d1 IM |
1512 | static int xsk_notifier(struct notifier_block *this, |
1513 | unsigned long msg, void *ptr) | |
1514 | { | |
1515 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1516 | struct net *net = dev_net(dev); | |
1517 | struct sock *sk; | |
1518 | ||
1519 | switch (msg) { | |
1520 | case NETDEV_UNREGISTER: | |
1521 | mutex_lock(&net->xdp.lock); | |
1522 | sk_for_each(sk, &net->xdp.list) { | |
1523 | struct xdp_sock *xs = xdp_sk(sk); | |
1524 | ||
1525 | mutex_lock(&xs->mutex); | |
1526 | if (xs->dev == dev) { | |
1527 | sk->sk_err = ENETDOWN; | |
1528 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1529 | sk_error_report(sk); |
455302d1 IM |
1530 | |
1531 | xsk_unbind_dev(xs); | |
1532 | ||
1c1efc2a MK |
1533 | /* Clear device references. */ |
1534 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1535 | } |
1536 | mutex_unlock(&xs->mutex); | |
1537 | } | |
1538 | mutex_unlock(&net->xdp.lock); | |
1539 | break; | |
1540 | } | |
1541 | return NOTIFY_DONE; | |
1542 | } | |
1543 | ||
c0c77d8f BT |
1544 | static struct proto xsk_proto = { |
1545 | .name = "XDP", | |
1546 | .owner = THIS_MODULE, | |
1547 | .obj_size = sizeof(struct xdp_sock), | |
1548 | }; | |
1549 | ||
1550 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1551 | .family = PF_XDP, |
1552 | .owner = THIS_MODULE, | |
1553 | .release = xsk_release, | |
1554 | .bind = xsk_bind, | |
1555 | .connect = sock_no_connect, | |
1556 | .socketpair = sock_no_socketpair, | |
1557 | .accept = sock_no_accept, | |
1558 | .getname = sock_no_getname, | |
a11e1d43 | 1559 | .poll = xsk_poll, |
c2f4374b BT |
1560 | .ioctl = sock_no_ioctl, |
1561 | .listen = sock_no_listen, | |
1562 | .shutdown = sock_no_shutdown, | |
1563 | .setsockopt = xsk_setsockopt, | |
1564 | .getsockopt = xsk_getsockopt, | |
1565 | .sendmsg = xsk_sendmsg, | |
45a86681 | 1566 | .recvmsg = xsk_recvmsg, |
c2f4374b | 1567 | .mmap = xsk_mmap, |
c0c77d8f BT |
1568 | }; |
1569 | ||
11fe9262 BT |
1570 | static void xsk_destruct(struct sock *sk) |
1571 | { | |
1572 | struct xdp_sock *xs = xdp_sk(sk); | |
1573 | ||
1574 | if (!sock_flag(sk, SOCK_DEAD)) | |
1575 | return; | |
1576 | ||
e5e1a4bc | 1577 | if (!xp_put_pool(xs->pool)) |
537cf4e3 | 1578 | xdp_put_umem(xs->umem, !xs->pool); |
11fe9262 BT |
1579 | } |
1580 | ||
c0c77d8f BT |
1581 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1582 | int kern) | |
1583 | { | |
c0c77d8f | 1584 | struct xdp_sock *xs; |
1c1efc2a | 1585 | struct sock *sk; |
c0c77d8f BT |
1586 | |
1587 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1588 | return -EPERM; | |
1589 | if (sock->type != SOCK_RAW) | |
1590 | return -ESOCKTNOSUPPORT; | |
1591 | ||
1592 | if (protocol) | |
1593 | return -EPROTONOSUPPORT; | |
1594 | ||
1595 | sock->state = SS_UNCONNECTED; | |
1596 | ||
1597 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1598 | if (!sk) | |
1599 | return -ENOBUFS; | |
1600 | ||
1601 | sock->ops = &xsk_proto_ops; | |
1602 | ||
1603 | sock_init_data(sock, sk); | |
1604 | ||
1605 | sk->sk_family = PF_XDP; | |
1606 | ||
11fe9262 | 1607 | sk->sk_destruct = xsk_destruct; |
11fe9262 | 1608 | |
cee27167 BT |
1609 | sock_set_flag(sk, SOCK_RCU_FREE); |
1610 | ||
c0c77d8f | 1611 | xs = xdp_sk(sk); |
455302d1 | 1612 | xs->state = XSK_READY; |
c0c77d8f | 1613 | mutex_init(&xs->mutex); |
bf0bdd13 | 1614 | spin_lock_init(&xs->rx_lock); |
c0c77d8f | 1615 | |
0402acd6 BT |
1616 | INIT_LIST_HEAD(&xs->map_list); |
1617 | spin_lock_init(&xs->map_list_lock); | |
1618 | ||
1d0dc069 BT |
1619 | mutex_lock(&net->xdp.lock); |
1620 | sk_add_node_rcu(sk, &net->xdp.list); | |
1621 | mutex_unlock(&net->xdp.lock); | |
1622 | ||
c0c77d8f | 1623 | sock_prot_inuse_add(net, &xsk_proto, 1); |
c0c77d8f BT |
1624 | |
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | static const struct net_proto_family xsk_family_ops = { | |
1629 | .family = PF_XDP, | |
1630 | .create = xsk_create, | |
1631 | .owner = THIS_MODULE, | |
1632 | }; | |
1633 | ||
455302d1 IM |
1634 | static struct notifier_block xsk_netdev_notifier = { |
1635 | .notifier_call = xsk_notifier, | |
1636 | }; | |
1637 | ||
1d0dc069 BT |
1638 | static int __net_init xsk_net_init(struct net *net) |
1639 | { | |
1640 | mutex_init(&net->xdp.lock); | |
1641 | INIT_HLIST_HEAD(&net->xdp.list); | |
1642 | return 0; | |
1643 | } | |
1644 | ||
1645 | static void __net_exit xsk_net_exit(struct net *net) | |
1646 | { | |
1647 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1648 | } | |
1649 | ||
1650 | static struct pernet_operations xsk_net_ops = { | |
1651 | .init = xsk_net_init, | |
1652 | .exit = xsk_net_exit, | |
1653 | }; | |
1654 | ||
c0c77d8f BT |
1655 | static int __init xsk_init(void) |
1656 | { | |
e312b9e7 | 1657 | int err, cpu; |
c0c77d8f BT |
1658 | |
1659 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1660 | if (err) | |
1661 | goto out; | |
1662 | ||
1663 | err = sock_register(&xsk_family_ops); | |
1664 | if (err) | |
1665 | goto out_proto; | |
1666 | ||
1d0dc069 BT |
1667 | err = register_pernet_subsys(&xsk_net_ops); |
1668 | if (err) | |
1669 | goto out_sk; | |
455302d1 IM |
1670 | |
1671 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1672 | if (err) | |
1673 | goto out_pernet; | |
1674 | ||
e312b9e7 BT |
1675 | for_each_possible_cpu(cpu) |
1676 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1677 | return 0; |
1678 | ||
455302d1 IM |
1679 | out_pernet: |
1680 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1681 | out_sk: |
1682 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1683 | out_proto: |
1684 | proto_unregister(&xsk_proto); | |
1685 | out: | |
1686 | return err; | |
1687 | } | |
1688 | ||
1689 | fs_initcall(xsk_init); |