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> |
49e47a5b | 28 | #include <net/netdev_rx_queue.h> |
b9b6b68e | 29 | #include <net/xdp.h> |
c0c77d8f | 30 | |
423f3832 | 31 | #include "xsk_queue.h" |
c0c77d8f | 32 | #include "xdp_umem.h" |
a36b38aa | 33 | #include "xsk.h" |
c0c77d8f | 34 | |
e7a1c130 | 35 | #define TX_BATCH_SIZE 32 |
99b29a49 | 36 | #define MAX_PER_SOCKET_BUDGET (TX_BATCH_SIZE) |
35fcde7f | 37 | |
e312b9e7 BT |
38 | static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); |
39 | ||
c4655761 | 40 | void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 41 | { |
c2d3d6a4 | 42 | if (pool->cached_need_wakeup & XDP_WAKEUP_RX) |
77cd0d7b MK |
43 | return; |
44 | ||
7361f9c3 | 45 | pool->fq->ring->flags |= XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 46 | pool->cached_need_wakeup |= XDP_WAKEUP_RX; |
77cd0d7b MK |
47 | } |
48 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
49 | ||
c4655761 | 50 | void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
51 | { |
52 | struct xdp_sock *xs; | |
53 | ||
c2d3d6a4 | 54 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) |
77cd0d7b MK |
55 | return; |
56 | ||
57 | rcu_read_lock(); | |
a5aa8e52 | 58 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
59 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
60 | } | |
61 | rcu_read_unlock(); | |
62 | ||
c2d3d6a4 | 63 | pool->cached_need_wakeup |= XDP_WAKEUP_TX; |
77cd0d7b MK |
64 | } |
65 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
66 | ||
c4655761 | 67 | void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 68 | { |
c2d3d6a4 | 69 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_RX)) |
77cd0d7b MK |
70 | return; |
71 | ||
7361f9c3 | 72 | pool->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 73 | pool->cached_need_wakeup &= ~XDP_WAKEUP_RX; |
77cd0d7b MK |
74 | } |
75 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
76 | ||
c4655761 | 77 | void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
78 | { |
79 | struct xdp_sock *xs; | |
80 | ||
c2d3d6a4 | 81 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_TX)) |
77cd0d7b MK |
82 | return; |
83 | ||
84 | rcu_read_lock(); | |
a5aa8e52 | 85 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
86 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
87 | } | |
88 | rcu_read_unlock(); | |
89 | ||
c2d3d6a4 | 90 | pool->cached_need_wakeup &= ~XDP_WAKEUP_TX; |
77cd0d7b MK |
91 | } |
92 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
93 | ||
c4655761 | 94 | bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 95 | { |
c2d3d6a4 | 96 | return pool->uses_need_wakeup; |
77cd0d7b | 97 | } |
c4655761 | 98 | EXPORT_SYMBOL(xsk_uses_need_wakeup); |
77cd0d7b | 99 | |
1c1efc2a MK |
100 | struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev, |
101 | u16 queue_id) | |
102 | { | |
103 | if (queue_id < dev->real_num_rx_queues) | |
104 | return dev->_rx[queue_id].pool; | |
105 | if (queue_id < dev->real_num_tx_queues) | |
106 | return dev->_tx[queue_id].pool; | |
107 | ||
108 | return NULL; | |
109 | } | |
110 | EXPORT_SYMBOL(xsk_get_pool_from_qid); | |
111 | ||
112 | void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id) | |
113 | { | |
b425e24a | 114 | if (queue_id < dev->num_rx_queues) |
1c1efc2a | 115 | dev->_rx[queue_id].pool = NULL; |
b425e24a | 116 | if (queue_id < dev->num_tx_queues) |
1c1efc2a MK |
117 | dev->_tx[queue_id].pool = NULL; |
118 | } | |
119 | ||
120 | /* The buffer pool is stored both in the _rx struct and the _tx struct as we do | |
121 | * not know if the device has more tx queues than rx, or the opposite. | |
122 | * This might also change during run time. | |
123 | */ | |
124 | int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool, | |
125 | u16 queue_id) | |
126 | { | |
127 | if (queue_id >= max_t(unsigned int, | |
128 | dev->real_num_rx_queues, | |
129 | dev->real_num_tx_queues)) | |
130 | return -EINVAL; | |
131 | ||
132 | if (queue_id < dev->real_num_rx_queues) | |
133 | dev->_rx[queue_id].pool = pool; | |
134 | if (queue_id < dev->real_num_tx_queues) | |
135 | dev->_tx[queue_id].pool = pool; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
556444c4 MF |
140 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff_xsk *xskb, u32 len, |
141 | u32 flags) | |
c05cd364 | 142 | { |
2b43470a BT |
143 | u64 addr; |
144 | int err; | |
c05cd364 | 145 | |
2b43470a | 146 | addr = xp_get_handle(xskb); |
63a64a56 | 147 | err = xskq_prod_reserve_desc(xs->rx, addr, len, flags); |
2b43470a | 148 | if (err) { |
8aa5a335 | 149 | xs->rx_queue_full++; |
2b43470a | 150 | return err; |
c05cd364 KL |
151 | } |
152 | ||
2b43470a BT |
153 | xp_release(xskb); |
154 | return 0; | |
c05cd364 KL |
155 | } |
156 | ||
556444c4 MF |
157 | static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
158 | { | |
159 | struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); | |
24ea5012 MF |
160 | u32 frags = xdp_buff_has_frags(xdp); |
161 | struct xdp_buff_xsk *pos, *tmp; | |
162 | struct list_head *xskb_list; | |
163 | u32 contd = 0; | |
164 | int err; | |
165 | ||
166 | if (frags) | |
167 | contd = XDP_PKT_CONTD; | |
168 | ||
169 | err = __xsk_rcv_zc(xs, xskb, len, contd); | |
26900989 MF |
170 | if (err) |
171 | goto err; | |
172 | if (likely(!frags)) | |
173 | return 0; | |
24ea5012 MF |
174 | |
175 | xskb_list = &xskb->pool->xskb_list; | |
176 | list_for_each_entry_safe(pos, tmp, xskb_list, xskb_list_node) { | |
177 | if (list_is_singular(xskb_list)) | |
178 | contd = 0; | |
179 | len = pos->xdp.data_end - pos->xdp.data; | |
180 | err = __xsk_rcv_zc(xs, pos, len, contd); | |
181 | if (err) | |
26900989 | 182 | goto err; |
24ea5012 MF |
183 | list_del(&pos->xskb_list_node); |
184 | } | |
556444c4 | 185 | |
26900989 MF |
186 | return 0; |
187 | err: | |
188 | xsk_buff_free(xdp); | |
24ea5012 | 189 | return err; |
556444c4 MF |
190 | } |
191 | ||
80462775 TS |
192 | static void *xsk_copy_xdp_start(struct xdp_buff *from) |
193 | { | |
194 | if (unlikely(xdp_data_meta_unsupported(from))) | |
195 | return from->data; | |
196 | else | |
197 | return from->data_meta; | |
198 | } | |
18baed26 | 199 | |
80462775 TS |
200 | static u32 xsk_copy_xdp(void *to, void **from, u32 to_len, |
201 | u32 *from_len, skb_frag_t **frag, u32 rem) | |
202 | { | |
203 | u32 copied = 0; | |
204 | ||
205 | while (1) { | |
206 | u32 copy_len = min_t(u32, *from_len, to_len); | |
207 | ||
208 | memcpy(to, *from, copy_len); | |
209 | copied += copy_len; | |
210 | if (rem == copied) | |
211 | return copied; | |
212 | ||
213 | if (*from_len == copy_len) { | |
214 | *from = skb_frag_address(*frag); | |
215 | *from_len = skb_frag_size((*frag)++); | |
216 | } else { | |
217 | *from += copy_len; | |
218 | *from_len -= copy_len; | |
219 | } | |
220 | if (to_len == copy_len) | |
221 | return copied; | |
222 | ||
223 | to_len -= copy_len; | |
224 | to += copy_len; | |
225 | } | |
c497176c BT |
226 | } |
227 | ||
faa91b83 | 228 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 229 | { |
80462775 TS |
230 | u32 frame_size = xsk_pool_get_rx_frame_size(xs->pool); |
231 | void *copy_from = xsk_copy_xdp_start(xdp), *copy_to; | |
232 | u32 from_len, meta_len, rem, num_desc; | |
556444c4 | 233 | struct xdp_buff_xsk *xskb; |
2b43470a | 234 | struct xdp_buff *xsk_xdp; |
80462775 TS |
235 | skb_frag_t *frag; |
236 | ||
237 | from_len = xdp->data_end - copy_from; | |
238 | meta_len = xdp->data - copy_from; | |
239 | rem = len + meta_len; | |
240 | ||
241 | if (len <= frame_size && !xdp_buff_has_frags(xdp)) { | |
242 | int err; | |
243 | ||
244 | xsk_xdp = xsk_buff_alloc(xs->pool); | |
245 | if (!xsk_xdp) { | |
246 | xs->rx_dropped++; | |
247 | return -ENOMEM; | |
248 | } | |
249 | memcpy(xsk_xdp->data - meta_len, copy_from, rem); | |
250 | xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp); | |
251 | err = __xsk_rcv_zc(xs, xskb, len, 0); | |
252 | if (err) { | |
253 | xsk_buff_free(xsk_xdp); | |
254 | return err; | |
255 | } | |
256 | ||
257 | return 0; | |
258 | } | |
2b43470a | 259 | |
80462775 TS |
260 | num_desc = (len - 1) / frame_size + 1; |
261 | ||
262 | if (!xsk_buff_can_alloc(xs->pool, num_desc)) { | |
173d3adb | 263 | xs->rx_dropped++; |
c6c1f11b | 264 | return -ENOMEM; |
2b43470a | 265 | } |
80462775 TS |
266 | if (xskq_prod_nb_free(xs->rx, num_desc) < num_desc) { |
267 | xs->rx_queue_full++; | |
268 | return -ENOBUFS; | |
269 | } | |
c497176c | 270 | |
80462775 TS |
271 | if (xdp_buff_has_frags(xdp)) { |
272 | struct skb_shared_info *sinfo; | |
273 | ||
274 | sinfo = xdp_get_shared_info_from_buff(xdp); | |
275 | frag = &sinfo->frags[0]; | |
2b43470a | 276 | } |
80462775 TS |
277 | |
278 | do { | |
279 | u32 to_len = frame_size + meta_len; | |
280 | u32 copied; | |
281 | ||
282 | xsk_xdp = xsk_buff_alloc(xs->pool); | |
283 | copy_to = xsk_xdp->data - meta_len; | |
284 | ||
285 | copied = xsk_copy_xdp(copy_to, ©_from, to_len, &from_len, &frag, rem); | |
286 | rem -= copied; | |
287 | ||
288 | xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp); | |
289 | __xsk_rcv_zc(xs, xskb, copied - meta_len, rem ? XDP_PKT_CONTD : 0); | |
290 | meta_len = 0; | |
291 | } while (rem); | |
292 | ||
2b43470a | 293 | return 0; |
c497176c BT |
294 | } |
295 | ||
3413f041 XZ |
296 | static bool xsk_tx_writeable(struct xdp_sock *xs) |
297 | { | |
298 | if (xskq_cons_present_entries(xs->tx) > xs->tx->nentries / 2) | |
299 | return false; | |
300 | ||
301 | return true; | |
302 | } | |
303 | ||
42fddcc7 BT |
304 | static bool xsk_is_bound(struct xdp_sock *xs) |
305 | { | |
306 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
307 | /* Matches smp_wmb() in bind(). */ | |
308 | smp_rmb(); | |
309 | return true; | |
310 | } | |
311 | return false; | |
312 | } | |
313 | ||
faa91b83 | 314 | static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
173d3adb | 315 | { |
42fddcc7 | 316 | if (!xsk_is_bound(xs)) |
2be4a677 | 317 | return -ENXIO; |
42fddcc7 | 318 | |
173d3adb BT |
319 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
320 | return -EINVAL; | |
321 | ||
80462775 | 322 | if (len > xsk_pool_get_rx_frame_size(xs->pool) && !xs->sg) { |
faa91b83 TS |
323 | xs->rx_dropped++; |
324 | return -ENOSPC; | |
325 | } | |
326 | ||
b02e5a0e | 327 | sk_mark_napi_id_once_xdp(&xs->sk, xdp); |
458f7272 | 328 | return 0; |
173d3adb BT |
329 | } |
330 | ||
d817991c | 331 | static void xsk_flush(struct xdp_sock *xs) |
c497176c | 332 | { |
59e35e55 | 333 | xskq_prod_submit(xs->rx); |
7361f9c3 | 334 | __xskq_cons_release(xs->pool->fq); |
43a825af | 335 | sock_def_readable(&xs->sk); |
c497176c BT |
336 | } |
337 | ||
338 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
339 | { | |
faa91b83 | 340 | u32 len = xdp_get_buff_len(xdp); |
c497176c BT |
341 | int err; |
342 | ||
bf0bdd13 | 343 | spin_lock_bh(&xs->rx_lock); |
faa91b83 | 344 | err = xsk_rcv_check(xs, xdp, len); |
458f7272 | 345 | if (!err) { |
faa91b83 | 346 | err = __xsk_rcv(xs, xdp, len); |
458f7272 BT |
347 | xsk_flush(xs); |
348 | } | |
bf0bdd13 | 349 | spin_unlock_bh(&xs->rx_lock); |
c497176c BT |
350 | return err; |
351 | } | |
352 | ||
458f7272 BT |
353 | static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
354 | { | |
faa91b83 | 355 | u32 len = xdp_get_buff_len(xdp); |
458f7272 | 356 | int err; |
458f7272 | 357 | |
faa91b83 | 358 | err = xsk_rcv_check(xs, xdp, len); |
458f7272 BT |
359 | if (err) |
360 | return err; | |
361 | ||
362 | if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { | |
363 | len = xdp->data_end - xdp->data; | |
556444c4 | 364 | return xsk_rcv_zc(xs, xdp, len); |
458f7272 BT |
365 | } |
366 | ||
faa91b83 | 367 | err = __xsk_rcv(xs, xdp, len); |
458f7272 BT |
368 | if (!err) |
369 | xdp_return_buff(xdp); | |
370 | return err; | |
371 | } | |
372 | ||
e312b9e7 | 373 | int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
d817991c | 374 | { |
e312b9e7 | 375 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
376 | int err; |
377 | ||
458f7272 | 378 | err = xsk_rcv(xs, xdp); |
d817991c BT |
379 | if (err) |
380 | return err; | |
381 | ||
382 | if (!xs->flush_node.prev) | |
383 | list_add(&xs->flush_node, flush_list); | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
e312b9e7 | 388 | void __xsk_map_flush(void) |
d817991c | 389 | { |
e312b9e7 | 390 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
391 | struct xdp_sock *xs, *tmp; |
392 | ||
393 | list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { | |
394 | xsk_flush(xs); | |
395 | __list_del_clearprev(&xs->flush_node); | |
396 | } | |
397 | } | |
398 | ||
9a675ba5 SAS |
399 | #ifdef CONFIG_DEBUG_NET |
400 | bool xsk_map_check_flush(void) | |
401 | { | |
402 | if (list_empty(this_cpu_ptr(&xskmap_flush_list))) | |
403 | return false; | |
404 | __xsk_map_flush(); | |
405 | return true; | |
406 | } | |
407 | #endif | |
408 | ||
c4655761 | 409 | void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries) |
ac98d8aa | 410 | { |
7361f9c3 | 411 | xskq_prod_submit_n(pool->cq, nb_entries); |
ac98d8aa | 412 | } |
c4655761 | 413 | EXPORT_SYMBOL(xsk_tx_completed); |
ac98d8aa | 414 | |
c4655761 | 415 | void xsk_tx_release(struct xsk_buff_pool *pool) |
ac98d8aa MK |
416 | { |
417 | struct xdp_sock *xs; | |
418 | ||
419 | rcu_read_lock(); | |
a5aa8e52 | 420 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
30744a68 | 421 | __xskq_cons_release(xs->tx); |
3413f041 XZ |
422 | if (xsk_tx_writeable(xs)) |
423 | xs->sk.sk_write_space(&xs->sk); | |
ac98d8aa MK |
424 | } |
425 | rcu_read_unlock(); | |
426 | } | |
c4655761 | 427 | EXPORT_SYMBOL(xsk_tx_release); |
ac98d8aa | 428 | |
c4655761 | 429 | bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) |
ac98d8aa | 430 | { |
99b29a49 | 431 | bool budget_exhausted = false; |
ac98d8aa MK |
432 | struct xdp_sock *xs; |
433 | ||
434 | rcu_read_lock(); | |
99b29a49 | 435 | again: |
a5aa8e52 | 436 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
99b29a49 AH |
437 | if (xs->tx_budget_spent >= MAX_PER_SOCKET_BUDGET) { |
438 | budget_exhausted = true; | |
439 | continue; | |
440 | } | |
441 | ||
1c1efc2a | 442 | if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { |
cf24f5a5 TS |
443 | if (xskq_has_descs(xs->tx)) |
444 | xskq_cons_release(xs->tx); | |
ac98d8aa | 445 | continue; |
8aa5a335 | 446 | } |
ac98d8aa | 447 | |
99b29a49 AH |
448 | xs->tx_budget_spent++; |
449 | ||
0a05861f | 450 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
451 | * Reserve space in the completion queue and only proceed |
452 | * if there is space in it. This avoids having to implement | |
453 | * any buffering in the Tx path. | |
454 | */ | |
7361f9c3 | 455 | if (xskq_prod_reserve_addr(pool->cq, desc->addr)) |
ac98d8aa MK |
456 | goto out; |
457 | ||
c5ed924b | 458 | xskq_cons_release(xs->tx); |
ac98d8aa MK |
459 | rcu_read_unlock(); |
460 | return true; | |
461 | } | |
462 | ||
99b29a49 AH |
463 | if (budget_exhausted) { |
464 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) | |
465 | xs->tx_budget_spent = 0; | |
466 | ||
467 | budget_exhausted = false; | |
468 | goto again; | |
469 | } | |
470 | ||
ac98d8aa MK |
471 | out: |
472 | rcu_read_unlock(); | |
473 | return false; | |
474 | } | |
c4655761 | 475 | EXPORT_SYMBOL(xsk_tx_peek_desc); |
ac98d8aa | 476 | |
d1bc532e | 477 | static u32 xsk_tx_peek_release_fallback(struct xsk_buff_pool *pool, u32 max_entries) |
9349eb3a | 478 | { |
d1bc532e | 479 | struct xdp_desc *descs = pool->tx_descs; |
9349eb3a MK |
480 | u32 nb_pkts = 0; |
481 | ||
482 | while (nb_pkts < max_entries && xsk_tx_peek_desc(pool, &descs[nb_pkts])) | |
483 | nb_pkts++; | |
484 | ||
485 | xsk_tx_release(pool); | |
486 | return nb_pkts; | |
487 | } | |
488 | ||
c00c4461 | 489 | u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 nb_pkts) |
9349eb3a MK |
490 | { |
491 | struct xdp_sock *xs; | |
9349eb3a MK |
492 | |
493 | rcu_read_lock(); | |
494 | if (!list_is_singular(&pool->xsk_tx_list)) { | |
495 | /* Fallback to the non-batched version */ | |
496 | rcu_read_unlock(); | |
c00c4461 | 497 | return xsk_tx_peek_release_fallback(pool, nb_pkts); |
9349eb3a MK |
498 | } |
499 | ||
500 | xs = list_first_or_null_rcu(&pool->xsk_tx_list, struct xdp_sock, tx_list); | |
501 | if (!xs) { | |
502 | nb_pkts = 0; | |
503 | goto out; | |
504 | } | |
505 | ||
c00c4461 | 506 | nb_pkts = xskq_cons_nb_entries(xs->tx, nb_pkts); |
9349eb3a MK |
507 | |
508 | /* This is the backpressure mechanism for the Tx path. Try to | |
509 | * reserve space in the completion queue for all packets, but | |
510 | * if there are fewer slots available, just process that many | |
511 | * packets. This avoids having to implement any buffering in | |
512 | * the Tx path. | |
513 | */ | |
c00c4461 | 514 | nb_pkts = xskq_prod_nb_free(pool->cq, nb_pkts); |
9349eb3a MK |
515 | if (!nb_pkts) |
516 | goto out; | |
517 | ||
c00c4461 MF |
518 | nb_pkts = xskq_cons_read_desc_batch(xs->tx, pool, nb_pkts); |
519 | if (!nb_pkts) { | |
520 | xs->tx->queue_empty_descs++; | |
521 | goto out; | |
522 | } | |
523 | ||
9349eb3a | 524 | __xskq_cons_release(xs->tx); |
c00c4461 | 525 | xskq_prod_write_addr_batch(pool->cq, pool->tx_descs, nb_pkts); |
9349eb3a MK |
526 | xs->sk.sk_write_space(&xs->sk); |
527 | ||
528 | out: | |
529 | rcu_read_unlock(); | |
530 | return nb_pkts; | |
531 | } | |
532 | EXPORT_SYMBOL(xsk_tx_peek_release_desc_batch); | |
533 | ||
06870682 | 534 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 535 | { |
ac98d8aa | 536 | struct net_device *dev = xs->dev; |
06870682 | 537 | |
18b1ab7a | 538 | return dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); |
ac98d8aa MK |
539 | } |
540 | ||
b7f72a30 TS |
541 | static int xsk_cq_reserve_addr_locked(struct xdp_sock *xs, u64 addr) |
542 | { | |
543 | unsigned long flags; | |
544 | int ret; | |
545 | ||
546 | spin_lock_irqsave(&xs->pool->cq_lock, flags); | |
547 | ret = xskq_prod_reserve_addr(xs->pool->cq, addr); | |
548 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
549 | ||
550 | return ret; | |
551 | } | |
552 | ||
553 | static void xsk_cq_submit_locked(struct xdp_sock *xs, u32 n) | |
554 | { | |
555 | unsigned long flags; | |
556 | ||
557 | spin_lock_irqsave(&xs->pool->cq_lock, flags); | |
558 | xskq_prod_submit_n(xs->pool->cq, n); | |
559 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
560 | } | |
561 | ||
562 | static void xsk_cq_cancel_locked(struct xdp_sock *xs, u32 n) | |
35fcde7f | 563 | { |
a9744f7c | 564 | unsigned long flags; |
35fcde7f | 565 | |
f09ced40 | 566 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
b7f72a30 | 567 | xskq_prod_cancel_n(xs->pool->cq, n); |
f09ced40 | 568 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
b7f72a30 | 569 | } |
35fcde7f | 570 | |
b7f72a30 TS |
571 | static u32 xsk_get_num_desc(struct sk_buff *skb) |
572 | { | |
573 | return skb ? (long)skb_shinfo(skb)->destructor_arg : 0; | |
574 | } | |
575 | ||
576 | static void xsk_destruct_skb(struct sk_buff *skb) | |
577 | { | |
48eb03dd SF |
578 | struct xsk_tx_metadata_compl *compl = &skb_shinfo(skb)->xsk_meta; |
579 | ||
580 | if (compl->tx_timestamp) { | |
581 | /* sw completion timestamp, not a real one */ | |
582 | *compl->tx_timestamp = ktime_get_tai_fast_ns(); | |
583 | } | |
584 | ||
b7f72a30 | 585 | xsk_cq_submit_locked(xdp_sk(skb->sk), xsk_get_num_desc(skb)); |
35fcde7f MK |
586 | sock_wfree(skb); |
587 | } | |
588 | ||
b7f72a30 TS |
589 | static void xsk_set_destructor_arg(struct sk_buff *skb) |
590 | { | |
591 | long num = xsk_get_num_desc(xdp_sk(skb->sk)->skb) + 1; | |
592 | ||
593 | skb_shinfo(skb)->destructor_arg = (void *)num; | |
594 | } | |
595 | ||
596 | static void xsk_consume_skb(struct sk_buff *skb) | |
597 | { | |
598 | struct xdp_sock *xs = xdp_sk(skb->sk); | |
599 | ||
600 | skb->destructor = sock_wfree; | |
601 | xsk_cq_cancel_locked(xs, xsk_get_num_desc(skb)); | |
602 | /* Free skb without triggering the perf drop trace */ | |
603 | consume_skb(skb); | |
604 | xs->skb = NULL; | |
605 | } | |
606 | ||
cf24f5a5 TS |
607 | static void xsk_drop_skb(struct sk_buff *skb) |
608 | { | |
609 | xdp_sk(skb->sk)->tx->invalid_descs += xsk_get_num_desc(skb); | |
610 | xsk_consume_skb(skb); | |
611 | } | |
612 | ||
9c8f21e6 XZ |
613 | static struct sk_buff *xsk_build_skb_zerocopy(struct xdp_sock *xs, |
614 | struct xdp_desc *desc) | |
615 | { | |
616 | struct xsk_buff_pool *pool = xs->pool; | |
617 | u32 hr, len, ts, offset, copy, copied; | |
cf24f5a5 | 618 | struct sk_buff *skb = xs->skb; |
9c8f21e6 XZ |
619 | struct page *page; |
620 | void *buffer; | |
621 | int err, i; | |
622 | u64 addr; | |
623 | ||
cf24f5a5 TS |
624 | if (!skb) { |
625 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(xs->dev->needed_headroom)); | |
9c8f21e6 | 626 | |
cf24f5a5 TS |
627 | skb = sock_alloc_send_skb(&xs->sk, hr, 1, &err); |
628 | if (unlikely(!skb)) | |
629 | return ERR_PTR(err); | |
9c8f21e6 | 630 | |
cf24f5a5 TS |
631 | skb_reserve(skb, hr); |
632 | } | |
9c8f21e6 XZ |
633 | |
634 | addr = desc->addr; | |
635 | len = desc->len; | |
636 | ts = pool->unaligned ? len : pool->chunk_size; | |
637 | ||
638 | buffer = xsk_buff_raw_get_data(pool, addr); | |
639 | offset = offset_in_page(buffer); | |
640 | addr = buffer - pool->addrs; | |
641 | ||
cf24f5a5 TS |
642 | for (copied = 0, i = skb_shinfo(skb)->nr_frags; copied < len; i++) { |
643 | if (unlikely(i >= MAX_SKB_FRAGS)) | |
9d0a67b9 | 644 | return ERR_PTR(-EOVERFLOW); |
cf24f5a5 | 645 | |
9c8f21e6 XZ |
646 | page = pool->umem->pgs[addr >> PAGE_SHIFT]; |
647 | get_page(page); | |
648 | ||
649 | copy = min_t(u32, PAGE_SIZE - offset, len - copied); | |
650 | skb_fill_page_desc(skb, i, page, offset, copy); | |
651 | ||
652 | copied += copy; | |
653 | addr += copy; | |
654 | offset = 0; | |
655 | } | |
656 | ||
657 | skb->len += len; | |
658 | skb->data_len += len; | |
659 | skb->truesize += ts; | |
660 | ||
661 | refcount_add(ts, &xs->sk.sk_wmem_alloc); | |
662 | ||
663 | return skb; | |
664 | } | |
665 | ||
666 | static struct sk_buff *xsk_build_skb(struct xdp_sock *xs, | |
667 | struct xdp_desc *desc) | |
668 | { | |
48eb03dd | 669 | struct xsk_tx_metadata *meta = NULL; |
9c8f21e6 | 670 | struct net_device *dev = xs->dev; |
cf24f5a5 | 671 | struct sk_buff *skb = xs->skb; |
48eb03dd | 672 | bool first_frag = false; |
cf24f5a5 | 673 | int err; |
9c8f21e6 XZ |
674 | |
675 | if (dev->priv_flags & IFF_TX_SKB_NO_LINEAR) { | |
676 | skb = xsk_build_skb_zerocopy(xs, desc); | |
cf24f5a5 TS |
677 | if (IS_ERR(skb)) { |
678 | err = PTR_ERR(skb); | |
679 | goto free_err; | |
680 | } | |
9c8f21e6 XZ |
681 | } else { |
682 | u32 hr, tr, len; | |
683 | void *buffer; | |
9c8f21e6 | 684 | |
cf24f5a5 | 685 | buffer = xsk_buff_raw_get_data(xs->pool, desc->addr); |
9c8f21e6 XZ |
686 | len = desc->len; |
687 | ||
cf24f5a5 TS |
688 | if (!skb) { |
689 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(dev->needed_headroom)); | |
690 | tr = dev->needed_tailroom; | |
691 | skb = sock_alloc_send_skb(&xs->sk, hr + len + tr, 1, &err); | |
692 | if (unlikely(!skb)) | |
693 | goto free_err; | |
9c8f21e6 | 694 | |
cf24f5a5 TS |
695 | skb_reserve(skb, hr); |
696 | skb_put(skb, len); | |
9c8f21e6 | 697 | |
cf24f5a5 | 698 | err = skb_store_bits(skb, 0, buffer, len); |
9d0a67b9 TS |
699 | if (unlikely(err)) { |
700 | kfree_skb(skb); | |
cf24f5a5 | 701 | goto free_err; |
9d0a67b9 | 702 | } |
48eb03dd SF |
703 | |
704 | first_frag = true; | |
cf24f5a5 TS |
705 | } else { |
706 | int nr_frags = skb_shinfo(skb)->nr_frags; | |
707 | struct page *page; | |
708 | u8 *vaddr; | |
709 | ||
710 | if (unlikely(nr_frags == (MAX_SKB_FRAGS - 1) && xp_mb_desc(desc))) { | |
9d0a67b9 | 711 | err = -EOVERFLOW; |
cf24f5a5 TS |
712 | goto free_err; |
713 | } | |
714 | ||
715 | page = alloc_page(xs->sk.sk_allocation); | |
716 | if (unlikely(!page)) { | |
717 | err = -EAGAIN; | |
718 | goto free_err; | |
719 | } | |
720 | ||
721 | vaddr = kmap_local_page(page); | |
722 | memcpy(vaddr, buffer, len); | |
723 | kunmap_local(vaddr); | |
724 | ||
725 | skb_add_rx_frag(skb, nr_frags, page, 0, len, 0); | |
9c8f21e6 | 726 | } |
48eb03dd SF |
727 | |
728 | if (first_frag && desc->options & XDP_TX_METADATA) { | |
729 | if (unlikely(xs->pool->tx_metadata_len == 0)) { | |
730 | err = -EINVAL; | |
731 | goto free_err; | |
732 | } | |
733 | ||
734 | meta = buffer - xs->pool->tx_metadata_len; | |
ce59f968 SF |
735 | if (unlikely(!xsk_buff_valid_tx_metadata(meta))) { |
736 | err = -EINVAL; | |
737 | goto free_err; | |
738 | } | |
48eb03dd SF |
739 | |
740 | if (meta->flags & XDP_TXMD_FLAGS_CHECKSUM) { | |
741 | if (unlikely(meta->request.csum_start + | |
742 | meta->request.csum_offset + | |
743 | sizeof(__sum16) > len)) { | |
744 | err = -EINVAL; | |
745 | goto free_err; | |
746 | } | |
747 | ||
748 | skb->csum_start = hr + meta->request.csum_start; | |
749 | skb->csum_offset = meta->request.csum_offset; | |
750 | skb->ip_summed = CHECKSUM_PARTIAL; | |
11614723 SF |
751 | |
752 | if (unlikely(xs->pool->tx_sw_csum)) { | |
753 | err = skb_checksum_help(skb); | |
754 | if (err) | |
755 | goto free_err; | |
756 | } | |
48eb03dd SF |
757 | } |
758 | } | |
9c8f21e6 XZ |
759 | } |
760 | ||
761 | skb->dev = dev; | |
10bbf165 | 762 | skb->priority = READ_ONCE(xs->sk.sk_priority); |
3c5b4d69 | 763 | skb->mark = READ_ONCE(xs->sk.sk_mark); |
9c8f21e6 | 764 | skb->destructor = xsk_destruct_skb; |
48eb03dd | 765 | xsk_tx_metadata_to_compl(meta, &skb_shinfo(skb)->xsk_meta); |
b7f72a30 | 766 | xsk_set_destructor_arg(skb); |
9c8f21e6 XZ |
767 | |
768 | return skb; | |
cf24f5a5 TS |
769 | |
770 | free_err: | |
9d0a67b9 TS |
771 | if (err == -EOVERFLOW) { |
772 | /* Drop the packet */ | |
773 | xsk_set_destructor_arg(xs->skb); | |
774 | xsk_drop_skb(xs->skb); | |
cf24f5a5 | 775 | xskq_cons_release(xs->tx); |
9d0a67b9 TS |
776 | } else { |
777 | /* Let application retry */ | |
778 | xsk_cq_cancel_locked(xs, 1); | |
cf24f5a5 TS |
779 | } |
780 | ||
781 | return ERR_PTR(err); | |
9c8f21e6 XZ |
782 | } |
783 | ||
1596dae2 | 784 | static int __xsk_generic_xmit(struct sock *sk) |
35fcde7f | 785 | { |
35fcde7f | 786 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 787 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
788 | bool sent_frame = false; |
789 | struct xdp_desc desc; | |
790 | struct sk_buff *skb; | |
791 | int err = 0; | |
792 | ||
35fcde7f MK |
793 | mutex_lock(&xs->mutex); |
794 | ||
18b1ab7a MK |
795 | /* Since we dropped the RCU read lock, the socket state might have changed. */ |
796 | if (unlikely(!xsk_is_bound(xs))) { | |
797 | err = -ENXIO; | |
798 | goto out; | |
799 | } | |
800 | ||
67571640 IM |
801 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
802 | goto out; | |
803 | ||
1c1efc2a | 804 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
35fcde7f MK |
805 | if (max_batch-- == 0) { |
806 | err = -EAGAIN; | |
807 | goto out; | |
808 | } | |
809 | ||
0a05861f | 810 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
811 | * Reserve space in the completion queue and only proceed |
812 | * if there is space in it. This avoids having to implement | |
813 | * any buffering in the Tx path. | |
814 | */ | |
b7f72a30 | 815 | if (xsk_cq_reserve_addr_locked(xs, desc.addr)) |
35fcde7f | 816 | goto out; |
35fcde7f | 817 | |
a6e944f2 CL |
818 | skb = xsk_build_skb(xs, &desc); |
819 | if (IS_ERR(skb)) { | |
820 | err = PTR_ERR(skb); | |
9d0a67b9 | 821 | if (err != -EOVERFLOW) |
cf24f5a5 TS |
822 | goto out; |
823 | err = 0; | |
824 | continue; | |
825 | } | |
826 | ||
827 | xskq_cons_release(xs->tx); | |
828 | ||
829 | if (xp_mb_desc(&desc)) { | |
830 | xs->skb = skb; | |
831 | continue; | |
a6e944f2 CL |
832 | } |
833 | ||
36ccdf85 | 834 | err = __dev_direct_xmit(skb, xs->queue_id); |
642e450b MK |
835 | if (err == NETDEV_TX_BUSY) { |
836 | /* Tell user-space to retry the send */ | |
cf24f5a5 | 837 | xskq_cons_cancel_n(xs->tx, xsk_get_num_desc(skb)); |
b7f72a30 | 838 | xsk_consume_skb(skb); |
642e450b MK |
839 | err = -EAGAIN; |
840 | goto out; | |
841 | } | |
842 | ||
35fcde7f | 843 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
642e450b | 844 | if (err == NET_XMIT_DROP) { |
fe588685 MK |
845 | /* SKB completed but not sent */ |
846 | err = -EBUSY; | |
cf24f5a5 | 847 | xs->skb = NULL; |
35fcde7f MK |
848 | goto out; |
849 | } | |
850 | ||
851 | sent_frame = true; | |
cf24f5a5 | 852 | xs->skb = NULL; |
35fcde7f MK |
853 | } |
854 | ||
cf24f5a5 TS |
855 | if (xskq_has_descs(xs->tx)) { |
856 | if (xs->skb) | |
857 | xsk_drop_skb(xs->skb); | |
858 | xskq_cons_release(xs->tx); | |
859 | } | |
8aa5a335 | 860 | |
35fcde7f MK |
861 | out: |
862 | if (sent_frame) | |
3413f041 XZ |
863 | if (xsk_tx_writeable(xs)) |
864 | sk->sk_write_space(sk); | |
35fcde7f MK |
865 | |
866 | mutex_unlock(&xs->mutex); | |
867 | return err; | |
868 | } | |
869 | ||
1596dae2 | 870 | static int xsk_generic_xmit(struct sock *sk) |
df551058 | 871 | { |
18b1ab7a | 872 | int ret; |
df551058 | 873 | |
18b1ab7a MK |
874 | /* Drop the RCU lock since the SKB path might sleep. */ |
875 | rcu_read_unlock(); | |
1596dae2 | 876 | ret = __xsk_generic_xmit(sk); |
18b1ab7a MK |
877 | /* Reaquire RCU lock before going into common code. */ |
878 | rcu_read_lock(); | |
879 | ||
880 | return ret; | |
df551058 MK |
881 | } |
882 | ||
a0731952 BT |
883 | static bool xsk_no_wakeup(struct sock *sk) |
884 | { | |
885 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
886 | /* Prefer busy-polling, skip the wakeup. */ | |
887 | return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) && | |
888 | READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID; | |
889 | #else | |
890 | return false; | |
891 | #endif | |
892 | } | |
893 | ||
1596dae2 MF |
894 | static int xsk_check_common(struct xdp_sock *xs) |
895 | { | |
896 | if (unlikely(!xsk_is_bound(xs))) | |
897 | return -ENXIO; | |
898 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
899 | return -ENETDOWN; | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
18b1ab7a | 904 | static int __xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
35fcde7f | 905 | { |
ac98d8aa | 906 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
907 | struct sock *sk = sock->sk; |
908 | struct xdp_sock *xs = xdp_sk(sk); | |
e3920818 | 909 | struct xsk_buff_pool *pool; |
1596dae2 | 910 | int err; |
35fcde7f | 911 | |
1596dae2 MF |
912 | err = xsk_check_common(xs); |
913 | if (err) | |
914 | return err; | |
df551058 | 915 | if (unlikely(need_wait)) |
ac98d8aa | 916 | return -EOPNOTSUPP; |
1596dae2 MF |
917 | if (unlikely(!xs->tx)) |
918 | return -ENOBUFS; | |
35fcde7f | 919 | |
ca2e1a62 MF |
920 | if (sk_can_busy_loop(sk)) { |
921 | if (xs->zc) | |
922 | __sk_mark_napi_id_once(sk, xsk_pool_get_napi_id(xs->pool)); | |
a0731952 | 923 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ |
ca2e1a62 | 924 | } |
a0731952 | 925 | |
8de8b71b | 926 | if (xs->zc && xsk_no_wakeup(sk)) |
a0731952 BT |
927 | return 0; |
928 | ||
e3920818 | 929 | pool = xs->pool; |
1596dae2 MF |
930 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) { |
931 | if (xs->zc) | |
932 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
933 | return xsk_generic_xmit(sk); | |
934 | } | |
e3920818 | 935 | return 0; |
35fcde7f MK |
936 | } |
937 | ||
18b1ab7a MK |
938 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
939 | { | |
940 | int ret; | |
941 | ||
942 | rcu_read_lock(); | |
943 | ret = __xsk_sendmsg(sock, m, total_len); | |
944 | rcu_read_unlock(); | |
945 | ||
946 | return ret; | |
947 | } | |
948 | ||
949 | static int __xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) | |
45a86681 BT |
950 | { |
951 | bool need_wait = !(flags & MSG_DONTWAIT); | |
952 | struct sock *sk = sock->sk; | |
953 | struct xdp_sock *xs = xdp_sk(sk); | |
1596dae2 | 954 | int err; |
45a86681 | 955 | |
1596dae2 MF |
956 | err = xsk_check_common(xs); |
957 | if (err) | |
958 | return err; | |
45a86681 BT |
959 | if (unlikely(!xs->rx)) |
960 | return -ENOBUFS; | |
45a86681 BT |
961 | if (unlikely(need_wait)) |
962 | return -EOPNOTSUPP; | |
963 | ||
a0731952 BT |
964 | if (sk_can_busy_loop(sk)) |
965 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ | |
966 | ||
967 | if (xsk_no_wakeup(sk)) | |
968 | return 0; | |
969 | ||
45a86681 BT |
970 | if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc) |
971 | return xsk_wakeup(xs, XDP_WAKEUP_RX); | |
972 | return 0; | |
35fcde7f MK |
973 | } |
974 | ||
18b1ab7a MK |
975 | static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) |
976 | { | |
977 | int ret; | |
978 | ||
979 | rcu_read_lock(); | |
980 | ret = __xsk_recvmsg(sock, m, len, flags); | |
981 | rcu_read_unlock(); | |
982 | ||
983 | return ret; | |
984 | } | |
985 | ||
5d946c5a | 986 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 987 | struct poll_table_struct *wait) |
c497176c | 988 | { |
f5da5418 | 989 | __poll_t mask = 0; |
df551058 MK |
990 | struct sock *sk = sock->sk; |
991 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 992 | struct xsk_buff_pool *pool; |
42fddcc7 | 993 | |
0706a78f MK |
994 | sock_poll_wait(file, sock, wait); |
995 | ||
18b1ab7a | 996 | rcu_read_lock(); |
1596dae2 | 997 | if (xsk_check_common(xs)) |
e4d008d4 | 998 | goto out; |
42fddcc7 | 999 | |
c2d3d6a4 | 1000 | pool = xs->pool; |
77cd0d7b | 1001 | |
c2d3d6a4 | 1002 | if (pool->cached_need_wakeup) { |
06870682 | 1003 | if (xs->zc) |
c2d3d6a4 | 1004 | xsk_wakeup(xs, pool->cached_need_wakeup); |
1596dae2 | 1005 | else if (xs->tx) |
df551058 | 1006 | /* Poll needs to drive Tx also in copy mode */ |
1596dae2 | 1007 | xsk_generic_xmit(sk); |
df551058 | 1008 | } |
c497176c | 1009 | |
59e35e55 | 1010 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 1011 | mask |= EPOLLIN | EPOLLRDNORM; |
3413f041 | 1012 | if (xs->tx && xsk_tx_writeable(xs)) |
5d946c5a | 1013 | mask |= EPOLLOUT | EPOLLWRNORM; |
e4d008d4 | 1014 | out: |
18b1ab7a | 1015 | rcu_read_unlock(); |
c497176c BT |
1016 | return mask; |
1017 | } | |
1018 | ||
b9b6b68e BT |
1019 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
1020 | bool umem_queue) | |
423f3832 MK |
1021 | { |
1022 | struct xsk_queue *q; | |
1023 | ||
1024 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
1025 | return -EINVAL; | |
1026 | ||
b9b6b68e | 1027 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
1028 | if (!q) |
1029 | return -ENOMEM; | |
1030 | ||
37b07693 BT |
1031 | /* Make sure queue is ready before it can be seen by others */ |
1032 | smp_wmb(); | |
94a99763 | 1033 | WRITE_ONCE(*queue, q); |
423f3832 MK |
1034 | return 0; |
1035 | } | |
1036 | ||
455302d1 IM |
1037 | static void xsk_unbind_dev(struct xdp_sock *xs) |
1038 | { | |
1039 | struct net_device *dev = xs->dev; | |
1040 | ||
42fddcc7 | 1041 | if (xs->state != XSK_BOUND) |
455302d1 | 1042 | return; |
42fddcc7 | 1043 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
1044 | |
1045 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 1046 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
1047 | synchronize_net(); |
1048 | dev_put(dev); | |
1049 | } | |
1050 | ||
0402acd6 | 1051 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
782347b6 | 1052 | struct xdp_sock __rcu ***map_entry) |
0402acd6 BT |
1053 | { |
1054 | struct xsk_map *map = NULL; | |
1055 | struct xsk_map_node *node; | |
1056 | ||
1057 | *map_entry = NULL; | |
1058 | ||
1059 | spin_lock_bh(&xs->map_list_lock); | |
1060 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
1061 | node); | |
1062 | if (node) { | |
bb1b25ca | 1063 | bpf_map_inc(&node->map->map); |
0402acd6 BT |
1064 | map = node->map; |
1065 | *map_entry = node->map_entry; | |
1066 | } | |
1067 | spin_unlock_bh(&xs->map_list_lock); | |
1068 | return map; | |
1069 | } | |
1070 | ||
1071 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
1072 | { | |
1073 | /* This function removes the current XDP socket from all the | |
1074 | * maps it resides in. We need to take extra care here, due to | |
1075 | * the two locks involved. Each map has a lock synchronizing | |
1076 | * updates to the entries, and each socket has a lock that | |
1077 | * synchronizes access to the list of maps (map_list). For | |
1078 | * deadlock avoidance the locks need to be taken in the order | |
1079 | * "map lock"->"socket map list lock". We start off by | |
1080 | * accessing the socket map list, and take a reference to the | |
1081 | * map to guarantee existence between the | |
1082 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
1083 | * calls. Then we ask the map to remove the socket, which | |
1084 | * tries to remove the socket from the map. Note that there | |
1085 | * might be updates to the map between | |
1086 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
1087 | */ | |
782347b6 | 1088 | struct xdp_sock __rcu **map_entry = NULL; |
0402acd6 BT |
1089 | struct xsk_map *map; |
1090 | ||
1091 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
1092 | xsk_map_try_sock_delete(map, xs, map_entry); | |
bb1b25ca | 1093 | bpf_map_put(&map->map); |
0402acd6 BT |
1094 | } |
1095 | } | |
1096 | ||
c0c77d8f BT |
1097 | static int xsk_release(struct socket *sock) |
1098 | { | |
1099 | struct sock *sk = sock->sk; | |
965a9909 | 1100 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
1101 | struct net *net; |
1102 | ||
1103 | if (!sk) | |
1104 | return 0; | |
1105 | ||
1106 | net = sock_net(sk); | |
1107 | ||
cf24f5a5 TS |
1108 | if (xs->skb) |
1109 | xsk_drop_skb(xs->skb); | |
1110 | ||
1d0dc069 BT |
1111 | mutex_lock(&net->xdp.lock); |
1112 | sk_del_node_init_rcu(sk); | |
1113 | mutex_unlock(&net->xdp.lock); | |
1114 | ||
c0c77d8f | 1115 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
c0c77d8f | 1116 | |
0402acd6 | 1117 | xsk_delete_from_maps(xs); |
42fddcc7 | 1118 | mutex_lock(&xs->mutex); |
455302d1 | 1119 | xsk_unbind_dev(xs); |
42fddcc7 | 1120 | mutex_unlock(&xs->mutex); |
965a9909 | 1121 | |
541d7fdd BT |
1122 | xskq_destroy(xs->rx); |
1123 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
1124 | xskq_destroy(xs->fq_tmp); |
1125 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 1126 | |
c0c77d8f BT |
1127 | sock_orphan(sk); |
1128 | sock->sk = NULL; | |
1129 | ||
c0c77d8f BT |
1130 | sock_put(sk); |
1131 | ||
1132 | return 0; | |
1133 | } | |
1134 | ||
965a9909 MK |
1135 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
1136 | { | |
1137 | struct socket *sock; | |
1138 | int err; | |
1139 | ||
1140 | sock = sockfd_lookup(fd, &err); | |
1141 | if (!sock) | |
1142 | return ERR_PTR(-ENOTSOCK); | |
1143 | ||
1144 | if (sock->sk->sk_family != PF_XDP) { | |
1145 | sockfd_put(sock); | |
1146 | return ERR_PTR(-ENOPROTOOPT); | |
1147 | } | |
1148 | ||
1149 | return sock; | |
1150 | } | |
1151 | ||
7361f9c3 MK |
1152 | static bool xsk_validate_queues(struct xdp_sock *xs) |
1153 | { | |
1154 | return xs->fq_tmp && xs->cq_tmp; | |
1155 | } | |
1156 | ||
965a9909 MK |
1157 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
1158 | { | |
1159 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
1160 | struct sock *sk = sock->sk; | |
965a9909 | 1161 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 1162 | struct net_device *dev; |
f7306ace | 1163 | int bound_dev_if; |
173d3adb | 1164 | u32 flags, qid; |
965a9909 MK |
1165 | int err = 0; |
1166 | ||
1167 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
1168 | return -EINVAL; | |
1169 | if (sxdp->sxdp_family != AF_XDP) | |
1170 | return -EINVAL; | |
1171 | ||
f54ba391 | 1172 | flags = sxdp->sxdp_flags; |
77cd0d7b | 1173 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
81470b5c | 1174 | XDP_USE_NEED_WAKEUP | XDP_USE_SG)) |
f54ba391 BT |
1175 | return -EINVAL; |
1176 | ||
f7306ace IM |
1177 | bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); |
1178 | if (bound_dev_if && bound_dev_if != sxdp->sxdp_ifindex) | |
1179 | return -EINVAL; | |
1180 | ||
5464c3a0 | 1181 | rtnl_lock(); |
965a9909 | 1182 | mutex_lock(&xs->mutex); |
455302d1 | 1183 | if (xs->state != XSK_READY) { |
959b71db BT |
1184 | err = -EBUSY; |
1185 | goto out_release; | |
1186 | } | |
1187 | ||
965a9909 MK |
1188 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
1189 | if (!dev) { | |
1190 | err = -ENODEV; | |
1191 | goto out_release; | |
1192 | } | |
1193 | ||
f6145903 | 1194 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
1195 | err = -EINVAL; |
1196 | goto out_unlock; | |
1197 | } | |
1198 | ||
173d3adb | 1199 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
1200 | |
1201 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
1202 | struct xdp_sock *umem_xs; |
1203 | struct socket *sock; | |
1204 | ||
77cd0d7b | 1205 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
81470b5c | 1206 | (flags & XDP_USE_NEED_WAKEUP) || (flags & XDP_USE_SG)) { |
173d3adb BT |
1207 | /* Cannot specify flags for shared sockets. */ |
1208 | err = -EINVAL; | |
1209 | goto out_unlock; | |
1210 | } | |
1211 | ||
965a9909 MK |
1212 | if (xs->umem) { |
1213 | /* We have already our own. */ | |
1214 | err = -EINVAL; | |
1215 | goto out_unlock; | |
1216 | } | |
1217 | ||
1218 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
1219 | if (IS_ERR(sock)) { | |
1220 | err = PTR_ERR(sock); | |
1221 | goto out_unlock; | |
1222 | } | |
1223 | ||
1224 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 1225 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
1226 | err = -EBADF; |
1227 | sockfd_put(sock); | |
1228 | goto out_unlock; | |
42fddcc7 | 1229 | } |
965a9909 | 1230 | |
a1132430 MK |
1231 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
1232 | /* Share the umem with another socket on another qid | |
1233 | * and/or device. | |
1234 | */ | |
b5aea28d MK |
1235 | xs->pool = xp_create_and_assign_umem(xs, |
1236 | umem_xs->umem); | |
1237 | if (!xs->pool) { | |
1fd17c8c | 1238 | err = -ENOMEM; |
b5aea28d MK |
1239 | sockfd_put(sock); |
1240 | goto out_unlock; | |
1241 | } | |
1242 | ||
60240bc2 JM |
1243 | err = xp_assign_dev_shared(xs->pool, umem_xs, dev, |
1244 | qid); | |
b5aea28d MK |
1245 | if (err) { |
1246 | xp_destroy(xs->pool); | |
83cf5c68 | 1247 | xs->pool = NULL; |
b5aea28d MK |
1248 | sockfd_put(sock); |
1249 | goto out_unlock; | |
1250 | } | |
1251 | } else { | |
1252 | /* Share the buffer pool with the other socket. */ | |
1253 | if (xs->fq_tmp || xs->cq_tmp) { | |
1254 | /* Do not allow setting your own fq or cq. */ | |
1255 | err = -EINVAL; | |
1256 | sockfd_put(sock); | |
1257 | goto out_unlock; | |
1258 | } | |
1259 | ||
1260 | xp_get_pool(umem_xs->pool); | |
1261 | xs->pool = umem_xs->pool; | |
ba3beec2 MF |
1262 | |
1263 | /* If underlying shared umem was created without Tx | |
1264 | * ring, allocate Tx descs array that Tx batching API | |
1265 | * utilizes | |
1266 | */ | |
1267 | if (xs->tx && !xs->pool->tx_descs) { | |
1268 | err = xp_alloc_tx_descs(xs->pool, xs); | |
1269 | if (err) { | |
1270 | xp_put_pool(xs->pool); | |
85c2c79a | 1271 | xs->pool = NULL; |
ba3beec2 MF |
1272 | sockfd_put(sock); |
1273 | goto out_unlock; | |
1274 | } | |
1275 | } | |
b5aea28d MK |
1276 | } |
1277 | ||
965a9909 | 1278 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 1279 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 1280 | sockfd_put(sock); |
7361f9c3 | 1281 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
1282 | err = -EINVAL; |
1283 | goto out_unlock; | |
c497176c BT |
1284 | } else { |
1285 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
1286 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
1287 | if (!xs->pool) { | |
1288 | err = -ENOMEM; | |
173d3adb | 1289 | goto out_unlock; |
1c1efc2a MK |
1290 | } |
1291 | ||
1292 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
1293 | if (err) { | |
1294 | xp_destroy(xs->pool); | |
1295 | xs->pool = NULL; | |
1c1efc2a MK |
1296 | goto out_unlock; |
1297 | } | |
965a9909 MK |
1298 | } |
1299 | ||
8bee6833 MK |
1300 | /* FQ and CQ are now owned by the buffer pool and cleaned up with it. */ |
1301 | xs->fq_tmp = NULL; | |
1302 | xs->cq_tmp = NULL; | |
1303 | ||
965a9909 | 1304 | xs->dev = dev; |
ac98d8aa | 1305 | xs->zc = xs->umem->zc; |
d609f3d2 | 1306 | xs->sg = !!(xs->umem->flags & XDP_UMEM_SG_FLAG); |
ac98d8aa | 1307 | xs->queue_id = qid; |
a5aa8e52 | 1308 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
1309 | |
1310 | out_unlock: | |
42fddcc7 | 1311 | if (err) { |
965a9909 | 1312 | dev_put(dev); |
42fddcc7 BT |
1313 | } else { |
1314 | /* Matches smp_rmb() in bind() for shared umem | |
1315 | * sockets, and xsk_is_bound(). | |
1316 | */ | |
1317 | smp_wmb(); | |
1318 | WRITE_ONCE(xs->state, XSK_BOUND); | |
1319 | } | |
965a9909 MK |
1320 | out_release: |
1321 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 1322 | rtnl_unlock(); |
965a9909 MK |
1323 | return err; |
1324 | } | |
1325 | ||
c05cd364 KL |
1326 | struct xdp_umem_reg_v1 { |
1327 | __u64 addr; /* Start of packet data area */ | |
1328 | __u64 len; /* Length of packet data area */ | |
1329 | __u32 chunk_size; | |
1330 | __u32 headroom; | |
1331 | }; | |
1332 | ||
341ac980 SF |
1333 | struct xdp_umem_reg_v2 { |
1334 | __u64 addr; /* Start of packet data area */ | |
1335 | __u64 len; /* Length of packet data area */ | |
1336 | __u32 chunk_size; | |
1337 | __u32 headroom; | |
1338 | __u32 flags; | |
1339 | }; | |
1340 | ||
c0c77d8f | 1341 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 1342 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
1343 | { |
1344 | struct sock *sk = sock->sk; | |
1345 | struct xdp_sock *xs = xdp_sk(sk); | |
1346 | int err; | |
1347 | ||
1348 | if (level != SOL_XDP) | |
1349 | return -ENOPROTOOPT; | |
1350 | ||
1351 | switch (optname) { | |
b9b6b68e | 1352 | case XDP_RX_RING: |
f6145903 | 1353 | case XDP_TX_RING: |
b9b6b68e BT |
1354 | { |
1355 | struct xsk_queue **q; | |
1356 | int entries; | |
1357 | ||
1358 | if (optlen < sizeof(entries)) | |
1359 | return -EINVAL; | |
a7b75c5a | 1360 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
1361 | return -EFAULT; |
1362 | ||
1363 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1364 | if (xs->state != XSK_READY) { |
1365 | mutex_unlock(&xs->mutex); | |
1366 | return -EBUSY; | |
1367 | } | |
f6145903 | 1368 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 1369 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
1370 | if (!err && optname == XDP_TX_RING) |
1371 | /* Tx needs to be explicitly woken up the first time */ | |
1372 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
1373 | mutex_unlock(&xs->mutex); |
1374 | return err; | |
1375 | } | |
c0c77d8f BT |
1376 | case XDP_UMEM_REG: |
1377 | { | |
c05cd364 KL |
1378 | size_t mr_size = sizeof(struct xdp_umem_reg); |
1379 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
1380 | struct xdp_umem *umem; |
1381 | ||
c05cd364 KL |
1382 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
1383 | return -EINVAL; | |
341ac980 | 1384 | else if (optlen < sizeof(struct xdp_umem_reg_v2)) |
c05cd364 | 1385 | mr_size = sizeof(struct xdp_umem_reg_v1); |
341ac980 SF |
1386 | else if (optlen < sizeof(mr)) |
1387 | mr_size = sizeof(struct xdp_umem_reg_v2); | |
c05cd364 | 1388 | |
a7b75c5a | 1389 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
1390 | return -EFAULT; |
1391 | ||
1392 | mutex_lock(&xs->mutex); | |
455302d1 | 1393 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
1394 | mutex_unlock(&xs->mutex); |
1395 | return -EBUSY; | |
1396 | } | |
c0c77d8f | 1397 | |
a49049ea BT |
1398 | umem = xdp_umem_create(&mr); |
1399 | if (IS_ERR(umem)) { | |
c0c77d8f | 1400 | mutex_unlock(&xs->mutex); |
a49049ea | 1401 | return PTR_ERR(umem); |
c0c77d8f BT |
1402 | } |
1403 | ||
1404 | /* Make sure umem is ready before it can be seen by others */ | |
1405 | smp_wmb(); | |
9764f4b3 | 1406 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
1407 | mutex_unlock(&xs->mutex); |
1408 | return 0; | |
1409 | } | |
423f3832 | 1410 | case XDP_UMEM_FILL_RING: |
fe230832 | 1411 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
1412 | { |
1413 | struct xsk_queue **q; | |
1414 | int entries; | |
1415 | ||
a7b75c5a | 1416 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
1417 | return -EFAULT; |
1418 | ||
1419 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1420 | if (xs->state != XSK_READY) { |
1421 | mutex_unlock(&xs->mutex); | |
1422 | return -EBUSY; | |
1423 | } | |
a49049ea | 1424 | |
7361f9c3 MK |
1425 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
1426 | &xs->cq_tmp; | |
b9b6b68e | 1427 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
1428 | mutex_unlock(&xs->mutex); |
1429 | return err; | |
1430 | } | |
c0c77d8f BT |
1431 | default: |
1432 | break; | |
1433 | } | |
1434 | ||
1435 | return -ENOPROTOOPT; | |
1436 | } | |
1437 | ||
77cd0d7b MK |
1438 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
1439 | { | |
1440 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
1441 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
1442 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
1443 | } | |
1444 | ||
1445 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
1446 | { | |
1447 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
1448 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
1449 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
1450 | } | |
1451 | ||
8aa5a335 CL |
1452 | struct xdp_statistics_v1 { |
1453 | __u64 rx_dropped; | |
1454 | __u64 rx_invalid_descs; | |
1455 | __u64 tx_invalid_descs; | |
1456 | }; | |
1457 | ||
af75d9e0 MK |
1458 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
1459 | char __user *optval, int __user *optlen) | |
1460 | { | |
1461 | struct sock *sk = sock->sk; | |
1462 | struct xdp_sock *xs = xdp_sk(sk); | |
1463 | int len; | |
1464 | ||
1465 | if (level != SOL_XDP) | |
1466 | return -ENOPROTOOPT; | |
1467 | ||
1468 | if (get_user(len, optlen)) | |
1469 | return -EFAULT; | |
1470 | if (len < 0) | |
1471 | return -EINVAL; | |
1472 | ||
1473 | switch (optname) { | |
1474 | case XDP_STATISTICS: | |
1475 | { | |
3c4f850e | 1476 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
1477 | bool extra_stats = true; |
1478 | size_t stats_size; | |
af75d9e0 | 1479 | |
8aa5a335 | 1480 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 1481 | return -EINVAL; |
8aa5a335 CL |
1482 | } else if (len < sizeof(stats)) { |
1483 | extra_stats = false; | |
1484 | stats_size = sizeof(struct xdp_statistics_v1); | |
1485 | } else { | |
1486 | stats_size = sizeof(stats); | |
1487 | } | |
af75d9e0 MK |
1488 | |
1489 | mutex_lock(&xs->mutex); | |
1490 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
1491 | if (extra_stats) { |
1492 | stats.rx_ring_full = xs->rx_queue_full; | |
1493 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 1494 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
1495 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
1496 | } else { | |
1497 | stats.rx_dropped += xs->rx_queue_full; | |
1498 | } | |
af75d9e0 MK |
1499 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
1500 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
1501 | mutex_unlock(&xs->mutex); | |
1502 | ||
8aa5a335 | 1503 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 1504 | return -EFAULT; |
8aa5a335 | 1505 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
1506 | return -EFAULT; |
1507 | ||
1508 | return 0; | |
1509 | } | |
b3a9e0be BT |
1510 | case XDP_MMAP_OFFSETS: |
1511 | { | |
1512 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
1513 | struct xdp_mmap_offsets_v1 off_v1; |
1514 | bool flags_supported = true; | |
1515 | void *to_copy; | |
b3a9e0be | 1516 | |
77cd0d7b | 1517 | if (len < sizeof(off_v1)) |
b3a9e0be | 1518 | return -EINVAL; |
77cd0d7b MK |
1519 | else if (len < sizeof(off)) |
1520 | flags_supported = false; | |
1521 | ||
1522 | if (flags_supported) { | |
1523 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
1524 | * except for the flags field added to the end. | |
1525 | */ | |
1526 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1527 | &off.rx); | |
1528 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1529 | &off.tx); | |
1530 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1531 | &off.fr); | |
1532 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1533 | &off.cr); | |
1534 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
1535 | ptrs.flags); | |
1536 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
1537 | ptrs.flags); | |
1538 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
1539 | ptrs.flags); | |
1540 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
1541 | ptrs.flags); | |
1542 | ||
1543 | len = sizeof(off); | |
1544 | to_copy = &off; | |
1545 | } else { | |
1546 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
1547 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
1548 | xsk_enter_umem_offsets(&off_v1.fr); | |
1549 | xsk_enter_umem_offsets(&off_v1.cr); | |
1550 | ||
1551 | len = sizeof(off_v1); | |
1552 | to_copy = &off_v1; | |
1553 | } | |
b3a9e0be | 1554 | |
77cd0d7b | 1555 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
1556 | return -EFAULT; |
1557 | if (put_user(len, optlen)) | |
1558 | return -EFAULT; | |
1559 | ||
1560 | return 0; | |
1561 | } | |
2640d3c8 MM |
1562 | case XDP_OPTIONS: |
1563 | { | |
1564 | struct xdp_options opts = {}; | |
1565 | ||
1566 | if (len < sizeof(opts)) | |
1567 | return -EINVAL; | |
1568 | ||
1569 | mutex_lock(&xs->mutex); | |
1570 | if (xs->zc) | |
1571 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1572 | mutex_unlock(&xs->mutex); | |
1573 | ||
1574 | len = sizeof(opts); | |
1575 | if (copy_to_user(optval, &opts, len)) | |
1576 | return -EFAULT; | |
1577 | if (put_user(len, optlen)) | |
1578 | return -EFAULT; | |
1579 | ||
1580 | return 0; | |
1581 | } | |
af75d9e0 MK |
1582 | default: |
1583 | break; | |
1584 | } | |
1585 | ||
1586 | return -EOPNOTSUPP; | |
1587 | } | |
1588 | ||
423f3832 MK |
1589 | static int xsk_mmap(struct file *file, struct socket *sock, |
1590 | struct vm_area_struct *vma) | |
1591 | { | |
a5a16e43 | 1592 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1593 | unsigned long size = vma->vm_end - vma->vm_start; |
1594 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
5f5a7d8d | 1595 | int state = READ_ONCE(xs->state); |
423f3832 | 1596 | struct xsk_queue *q = NULL; |
423f3832 | 1597 | |
5f5a7d8d | 1598 | if (state != XSK_READY && state != XSK_BOUND) |
455302d1 IM |
1599 | return -EBUSY; |
1600 | ||
b9b6b68e | 1601 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1602 | q = READ_ONCE(xs->rx); |
f6145903 | 1603 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1604 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1605 | } else { |
e6762c8b MK |
1606 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1607 | smp_rmb(); | |
b9b6b68e | 1608 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
5f5a7d8d NG |
1609 | q = state == XSK_READY ? READ_ONCE(xs->fq_tmp) : |
1610 | READ_ONCE(xs->pool->fq); | |
fe230832 | 1611 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
5f5a7d8d NG |
1612 | q = state == XSK_READY ? READ_ONCE(xs->cq_tmp) : |
1613 | READ_ONCE(xs->pool->cq); | |
b9b6b68e | 1614 | } |
423f3832 MK |
1615 | |
1616 | if (!q) | |
1617 | return -EINVAL; | |
1618 | ||
e6762c8b MK |
1619 | /* Matches the smp_wmb() in xsk_init_queue */ |
1620 | smp_rmb(); | |
9f78bf33 | 1621 | if (size > q->ring_vmalloc_size) |
423f3832 MK |
1622 | return -EINVAL; |
1623 | ||
9f78bf33 | 1624 | return remap_vmalloc_range(vma, q->ring, 0); |
423f3832 MK |
1625 | } |
1626 | ||
455302d1 IM |
1627 | static int xsk_notifier(struct notifier_block *this, |
1628 | unsigned long msg, void *ptr) | |
1629 | { | |
1630 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1631 | struct net *net = dev_net(dev); | |
1632 | struct sock *sk; | |
1633 | ||
1634 | switch (msg) { | |
1635 | case NETDEV_UNREGISTER: | |
1636 | mutex_lock(&net->xdp.lock); | |
1637 | sk_for_each(sk, &net->xdp.list) { | |
1638 | struct xdp_sock *xs = xdp_sk(sk); | |
1639 | ||
1640 | mutex_lock(&xs->mutex); | |
1641 | if (xs->dev == dev) { | |
1642 | sk->sk_err = ENETDOWN; | |
1643 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1644 | sk_error_report(sk); |
455302d1 IM |
1645 | |
1646 | xsk_unbind_dev(xs); | |
1647 | ||
1c1efc2a MK |
1648 | /* Clear device references. */ |
1649 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1650 | } |
1651 | mutex_unlock(&xs->mutex); | |
1652 | } | |
1653 | mutex_unlock(&net->xdp.lock); | |
1654 | break; | |
1655 | } | |
1656 | return NOTIFY_DONE; | |
1657 | } | |
1658 | ||
c0c77d8f BT |
1659 | static struct proto xsk_proto = { |
1660 | .name = "XDP", | |
1661 | .owner = THIS_MODULE, | |
1662 | .obj_size = sizeof(struct xdp_sock), | |
1663 | }; | |
1664 | ||
1665 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1666 | .family = PF_XDP, |
1667 | .owner = THIS_MODULE, | |
1668 | .release = xsk_release, | |
1669 | .bind = xsk_bind, | |
1670 | .connect = sock_no_connect, | |
1671 | .socketpair = sock_no_socketpair, | |
1672 | .accept = sock_no_accept, | |
1673 | .getname = sock_no_getname, | |
a11e1d43 | 1674 | .poll = xsk_poll, |
c2f4374b BT |
1675 | .ioctl = sock_no_ioctl, |
1676 | .listen = sock_no_listen, | |
1677 | .shutdown = sock_no_shutdown, | |
1678 | .setsockopt = xsk_setsockopt, | |
1679 | .getsockopt = xsk_getsockopt, | |
1680 | .sendmsg = xsk_sendmsg, | |
45a86681 | 1681 | .recvmsg = xsk_recvmsg, |
c2f4374b | 1682 | .mmap = xsk_mmap, |
c0c77d8f BT |
1683 | }; |
1684 | ||
11fe9262 BT |
1685 | static void xsk_destruct(struct sock *sk) |
1686 | { | |
1687 | struct xdp_sock *xs = xdp_sk(sk); | |
1688 | ||
1689 | if (!sock_flag(sk, SOCK_DEAD)) | |
1690 | return; | |
1691 | ||
e5e1a4bc | 1692 | if (!xp_put_pool(xs->pool)) |
537cf4e3 | 1693 | xdp_put_umem(xs->umem, !xs->pool); |
11fe9262 BT |
1694 | } |
1695 | ||
c0c77d8f BT |
1696 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1697 | int kern) | |
1698 | { | |
c0c77d8f | 1699 | struct xdp_sock *xs; |
1c1efc2a | 1700 | struct sock *sk; |
c0c77d8f BT |
1701 | |
1702 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1703 | return -EPERM; | |
1704 | if (sock->type != SOCK_RAW) | |
1705 | return -ESOCKTNOSUPPORT; | |
1706 | ||
1707 | if (protocol) | |
1708 | return -EPROTONOSUPPORT; | |
1709 | ||
1710 | sock->state = SS_UNCONNECTED; | |
1711 | ||
1712 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1713 | if (!sk) | |
1714 | return -ENOBUFS; | |
1715 | ||
1716 | sock->ops = &xsk_proto_ops; | |
1717 | ||
1718 | sock_init_data(sock, sk); | |
1719 | ||
1720 | sk->sk_family = PF_XDP; | |
1721 | ||
11fe9262 | 1722 | sk->sk_destruct = xsk_destruct; |
11fe9262 | 1723 | |
cee27167 BT |
1724 | sock_set_flag(sk, SOCK_RCU_FREE); |
1725 | ||
c0c77d8f | 1726 | xs = xdp_sk(sk); |
455302d1 | 1727 | xs->state = XSK_READY; |
c0c77d8f | 1728 | mutex_init(&xs->mutex); |
bf0bdd13 | 1729 | spin_lock_init(&xs->rx_lock); |
c0c77d8f | 1730 | |
0402acd6 BT |
1731 | INIT_LIST_HEAD(&xs->map_list); |
1732 | spin_lock_init(&xs->map_list_lock); | |
1733 | ||
1d0dc069 BT |
1734 | mutex_lock(&net->xdp.lock); |
1735 | sk_add_node_rcu(sk, &net->xdp.list); | |
1736 | mutex_unlock(&net->xdp.lock); | |
1737 | ||
c0c77d8f | 1738 | sock_prot_inuse_add(net, &xsk_proto, 1); |
c0c77d8f BT |
1739 | |
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | static const struct net_proto_family xsk_family_ops = { | |
1744 | .family = PF_XDP, | |
1745 | .create = xsk_create, | |
1746 | .owner = THIS_MODULE, | |
1747 | }; | |
1748 | ||
455302d1 IM |
1749 | static struct notifier_block xsk_netdev_notifier = { |
1750 | .notifier_call = xsk_notifier, | |
1751 | }; | |
1752 | ||
1d0dc069 BT |
1753 | static int __net_init xsk_net_init(struct net *net) |
1754 | { | |
1755 | mutex_init(&net->xdp.lock); | |
1756 | INIT_HLIST_HEAD(&net->xdp.list); | |
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | static void __net_exit xsk_net_exit(struct net *net) | |
1761 | { | |
1762 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1763 | } | |
1764 | ||
1765 | static struct pernet_operations xsk_net_ops = { | |
1766 | .init = xsk_net_init, | |
1767 | .exit = xsk_net_exit, | |
1768 | }; | |
1769 | ||
c0c77d8f BT |
1770 | static int __init xsk_init(void) |
1771 | { | |
e312b9e7 | 1772 | int err, cpu; |
c0c77d8f BT |
1773 | |
1774 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1775 | if (err) | |
1776 | goto out; | |
1777 | ||
1778 | err = sock_register(&xsk_family_ops); | |
1779 | if (err) | |
1780 | goto out_proto; | |
1781 | ||
1d0dc069 BT |
1782 | err = register_pernet_subsys(&xsk_net_ops); |
1783 | if (err) | |
1784 | goto out_sk; | |
455302d1 IM |
1785 | |
1786 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1787 | if (err) | |
1788 | goto out_pernet; | |
1789 | ||
e312b9e7 BT |
1790 | for_each_possible_cpu(cpu) |
1791 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1792 | return 0; |
1793 | ||
455302d1 IM |
1794 | out_pernet: |
1795 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1796 | out_sk: |
1797 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1798 | out_proto: |
1799 | proto_unregister(&xsk_proto); | |
1800 | out: | |
1801 | return err; | |
1802 | } | |
1803 | ||
1804 | fs_initcall(xsk_init); |