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Commit | Line | Data |
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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> |
a71506a4 | 25 | #include <net/xdp_sock_drv.h> |
b9b6b68e | 26 | #include <net/xdp.h> |
c0c77d8f | 27 | |
423f3832 | 28 | #include "xsk_queue.h" |
c0c77d8f | 29 | #include "xdp_umem.h" |
a36b38aa | 30 | #include "xsk.h" |
c0c77d8f | 31 | |
35fcde7f MK |
32 | #define TX_BATCH_SIZE 16 |
33 | ||
e312b9e7 BT |
34 | static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); |
35 | ||
c4655761 | 36 | void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 37 | { |
c2d3d6a4 | 38 | if (pool->cached_need_wakeup & XDP_WAKEUP_RX) |
77cd0d7b MK |
39 | return; |
40 | ||
7361f9c3 | 41 | pool->fq->ring->flags |= XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 42 | pool->cached_need_wakeup |= XDP_WAKEUP_RX; |
77cd0d7b MK |
43 | } |
44 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
45 | ||
c4655761 | 46 | void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
47 | { |
48 | struct xdp_sock *xs; | |
49 | ||
c2d3d6a4 | 50 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) |
77cd0d7b MK |
51 | return; |
52 | ||
53 | rcu_read_lock(); | |
a5aa8e52 | 54 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
55 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
56 | } | |
57 | rcu_read_unlock(); | |
58 | ||
c2d3d6a4 | 59 | pool->cached_need_wakeup |= XDP_WAKEUP_TX; |
77cd0d7b MK |
60 | } |
61 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
62 | ||
c4655761 | 63 | void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 64 | { |
c2d3d6a4 | 65 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_RX)) |
77cd0d7b MK |
66 | return; |
67 | ||
7361f9c3 | 68 | pool->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 69 | pool->cached_need_wakeup &= ~XDP_WAKEUP_RX; |
77cd0d7b MK |
70 | } |
71 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
72 | ||
c4655761 | 73 | void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
74 | { |
75 | struct xdp_sock *xs; | |
76 | ||
c2d3d6a4 | 77 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_TX)) |
77cd0d7b MK |
78 | return; |
79 | ||
80 | rcu_read_lock(); | |
a5aa8e52 | 81 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
82 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
83 | } | |
84 | rcu_read_unlock(); | |
85 | ||
c2d3d6a4 | 86 | pool->cached_need_wakeup &= ~XDP_WAKEUP_TX; |
77cd0d7b MK |
87 | } |
88 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
89 | ||
c4655761 | 90 | bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 91 | { |
c2d3d6a4 | 92 | return pool->uses_need_wakeup; |
77cd0d7b | 93 | } |
c4655761 | 94 | EXPORT_SYMBOL(xsk_uses_need_wakeup); |
77cd0d7b | 95 | |
1c1efc2a MK |
96 | struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev, |
97 | u16 queue_id) | |
98 | { | |
99 | if (queue_id < dev->real_num_rx_queues) | |
100 | return dev->_rx[queue_id].pool; | |
101 | if (queue_id < dev->real_num_tx_queues) | |
102 | return dev->_tx[queue_id].pool; | |
103 | ||
104 | return NULL; | |
105 | } | |
106 | EXPORT_SYMBOL(xsk_get_pool_from_qid); | |
107 | ||
108 | void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id) | |
109 | { | |
110 | if (queue_id < dev->real_num_rx_queues) | |
111 | dev->_rx[queue_id].pool = NULL; | |
112 | if (queue_id < dev->real_num_tx_queues) | |
113 | dev->_tx[queue_id].pool = NULL; | |
114 | } | |
115 | ||
116 | /* The buffer pool is stored both in the _rx struct and the _tx struct as we do | |
117 | * not know if the device has more tx queues than rx, or the opposite. | |
118 | * This might also change during run time. | |
119 | */ | |
120 | int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool, | |
121 | u16 queue_id) | |
122 | { | |
123 | if (queue_id >= max_t(unsigned int, | |
124 | dev->real_num_rx_queues, | |
125 | dev->real_num_tx_queues)) | |
126 | return -EINVAL; | |
127 | ||
128 | if (queue_id < dev->real_num_rx_queues) | |
129 | dev->_rx[queue_id].pool = pool; | |
130 | if (queue_id < dev->real_num_tx_queues) | |
131 | dev->_tx[queue_id].pool = pool; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
26062b18 BT |
136 | void xp_release(struct xdp_buff_xsk *xskb) |
137 | { | |
138 | xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb; | |
139 | } | |
140 | ||
141 | static u64 xp_get_handle(struct xdp_buff_xsk *xskb) | |
142 | { | |
143 | u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start; | |
144 | ||
145 | offset += xskb->pool->headroom; | |
146 | if (!xskb->pool->unaligned) | |
147 | return xskb->orig_addr + offset; | |
148 | return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT); | |
149 | } | |
150 | ||
2b43470a | 151 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c05cd364 | 152 | { |
2b43470a BT |
153 | struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); |
154 | u64 addr; | |
155 | int err; | |
c05cd364 | 156 | |
2b43470a BT |
157 | addr = xp_get_handle(xskb); |
158 | err = xskq_prod_reserve_desc(xs->rx, addr, len); | |
159 | if (err) { | |
8aa5a335 | 160 | xs->rx_queue_full++; |
2b43470a | 161 | return err; |
c05cd364 KL |
162 | } |
163 | ||
2b43470a BT |
164 | xp_release(xskb); |
165 | return 0; | |
c05cd364 KL |
166 | } |
167 | ||
2b43470a | 168 | static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len) |
c497176c | 169 | { |
2b43470a | 170 | void *from_buf, *to_buf; |
18baed26 | 171 | u32 metalen; |
c497176c | 172 | |
2b43470a BT |
173 | if (unlikely(xdp_data_meta_unsupported(from))) { |
174 | from_buf = from->data; | |
175 | to_buf = to->data; | |
18baed26 BT |
176 | metalen = 0; |
177 | } else { | |
2b43470a BT |
178 | from_buf = from->data_meta; |
179 | metalen = from->data - from->data_meta; | |
180 | to_buf = to->data - metalen; | |
18baed26 BT |
181 | } |
182 | ||
2b43470a | 183 | memcpy(to_buf, from_buf, len + metalen); |
c497176c BT |
184 | } |
185 | ||
2b43470a BT |
186 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len, |
187 | bool explicit_free) | |
c497176c | 188 | { |
2b43470a BT |
189 | struct xdp_buff *xsk_xdp; |
190 | int err; | |
c497176c | 191 | |
c4655761 | 192 | if (len > xsk_pool_get_rx_frame_size(xs->pool)) { |
2b43470a BT |
193 | xs->rx_dropped++; |
194 | return -ENOSPC; | |
195 | } | |
196 | ||
c4655761 | 197 | xsk_xdp = xsk_buff_alloc(xs->pool); |
2b43470a | 198 | if (!xsk_xdp) { |
173d3adb | 199 | xs->rx_dropped++; |
2b43470a BT |
200 | return -ENOSPC; |
201 | } | |
c497176c | 202 | |
2b43470a BT |
203 | xsk_copy_xdp(xsk_xdp, xdp, len); |
204 | err = __xsk_rcv_zc(xs, xsk_xdp, len); | |
205 | if (err) { | |
206 | xsk_buff_free(xsk_xdp); | |
207 | return err; | |
208 | } | |
209 | if (explicit_free) | |
210 | xdp_return_buff(xdp); | |
211 | return 0; | |
c497176c BT |
212 | } |
213 | ||
42fddcc7 BT |
214 | static bool xsk_is_bound(struct xdp_sock *xs) |
215 | { | |
216 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
217 | /* Matches smp_wmb() in bind(). */ | |
218 | smp_rmb(); | |
219 | return true; | |
220 | } | |
221 | return false; | |
222 | } | |
223 | ||
2b43470a BT |
224 | static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, |
225 | bool explicit_free) | |
173d3adb BT |
226 | { |
227 | u32 len; | |
228 | ||
42fddcc7 BT |
229 | if (!xsk_is_bound(xs)) |
230 | return -EINVAL; | |
231 | ||
173d3adb BT |
232 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
233 | return -EINVAL; | |
234 | ||
235 | len = xdp->data_end - xdp->data; | |
236 | ||
0807892e | 237 | return xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL ? |
2b43470a BT |
238 | __xsk_rcv_zc(xs, xdp, len) : |
239 | __xsk_rcv(xs, xdp, len, explicit_free); | |
173d3adb BT |
240 | } |
241 | ||
d817991c | 242 | static void xsk_flush(struct xdp_sock *xs) |
c497176c | 243 | { |
59e35e55 | 244 | xskq_prod_submit(xs->rx); |
7361f9c3 | 245 | __xskq_cons_release(xs->pool->fq); |
43a825af | 246 | sock_def_readable(&xs->sk); |
c497176c BT |
247 | } |
248 | ||
249 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
250 | { | |
251 | int err; | |
252 | ||
bf0bdd13 | 253 | spin_lock_bh(&xs->rx_lock); |
2b43470a BT |
254 | err = xsk_rcv(xs, xdp, false); |
255 | xsk_flush(xs); | |
bf0bdd13 | 256 | spin_unlock_bh(&xs->rx_lock); |
c497176c BT |
257 | return err; |
258 | } | |
259 | ||
e312b9e7 | 260 | int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
d817991c | 261 | { |
e312b9e7 | 262 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
263 | int err; |
264 | ||
2b43470a | 265 | err = xsk_rcv(xs, xdp, true); |
d817991c BT |
266 | if (err) |
267 | return err; | |
268 | ||
269 | if (!xs->flush_node.prev) | |
270 | list_add(&xs->flush_node, flush_list); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
e312b9e7 | 275 | void __xsk_map_flush(void) |
d817991c | 276 | { |
e312b9e7 | 277 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
278 | struct xdp_sock *xs, *tmp; |
279 | ||
280 | list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { | |
281 | xsk_flush(xs); | |
282 | __list_del_clearprev(&xs->flush_node); | |
283 | } | |
284 | } | |
285 | ||
c4655761 | 286 | void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries) |
ac98d8aa | 287 | { |
7361f9c3 | 288 | xskq_prod_submit_n(pool->cq, nb_entries); |
ac98d8aa | 289 | } |
c4655761 | 290 | EXPORT_SYMBOL(xsk_tx_completed); |
ac98d8aa | 291 | |
c4655761 | 292 | void xsk_tx_release(struct xsk_buff_pool *pool) |
ac98d8aa MK |
293 | { |
294 | struct xdp_sock *xs; | |
295 | ||
296 | rcu_read_lock(); | |
a5aa8e52 | 297 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
30744a68 | 298 | __xskq_cons_release(xs->tx); |
ac98d8aa MK |
299 | xs->sk.sk_write_space(&xs->sk); |
300 | } | |
301 | rcu_read_unlock(); | |
302 | } | |
c4655761 | 303 | EXPORT_SYMBOL(xsk_tx_release); |
ac98d8aa | 304 | |
c4655761 | 305 | bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) |
ac98d8aa | 306 | { |
ac98d8aa MK |
307 | struct xdp_sock *xs; |
308 | ||
309 | rcu_read_lock(); | |
a5aa8e52 | 310 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
1c1efc2a | 311 | if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { |
8aa5a335 | 312 | xs->tx->queue_empty_descs++; |
ac98d8aa | 313 | continue; |
8aa5a335 | 314 | } |
ac98d8aa | 315 | |
0a05861f | 316 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
317 | * Reserve space in the completion queue and only proceed |
318 | * if there is space in it. This avoids having to implement | |
319 | * any buffering in the Tx path. | |
320 | */ | |
7361f9c3 | 321 | if (xskq_prod_reserve_addr(pool->cq, desc->addr)) |
ac98d8aa MK |
322 | goto out; |
323 | ||
c5ed924b | 324 | xskq_cons_release(xs->tx); |
ac98d8aa MK |
325 | rcu_read_unlock(); |
326 | return true; | |
327 | } | |
328 | ||
329 | out: | |
330 | rcu_read_unlock(); | |
331 | return false; | |
332 | } | |
c4655761 | 333 | EXPORT_SYMBOL(xsk_tx_peek_desc); |
ac98d8aa | 334 | |
9349eb3a MK |
335 | static u32 xsk_tx_peek_release_fallback(struct xsk_buff_pool *pool, struct xdp_desc *descs, |
336 | u32 max_entries) | |
337 | { | |
338 | u32 nb_pkts = 0; | |
339 | ||
340 | while (nb_pkts < max_entries && xsk_tx_peek_desc(pool, &descs[nb_pkts])) | |
341 | nb_pkts++; | |
342 | ||
343 | xsk_tx_release(pool); | |
344 | return nb_pkts; | |
345 | } | |
346 | ||
347 | u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, struct xdp_desc *descs, | |
348 | u32 max_entries) | |
349 | { | |
350 | struct xdp_sock *xs; | |
351 | u32 nb_pkts; | |
352 | ||
353 | rcu_read_lock(); | |
354 | if (!list_is_singular(&pool->xsk_tx_list)) { | |
355 | /* Fallback to the non-batched version */ | |
356 | rcu_read_unlock(); | |
357 | return xsk_tx_peek_release_fallback(pool, descs, max_entries); | |
358 | } | |
359 | ||
360 | xs = list_first_or_null_rcu(&pool->xsk_tx_list, struct xdp_sock, tx_list); | |
361 | if (!xs) { | |
362 | nb_pkts = 0; | |
363 | goto out; | |
364 | } | |
365 | ||
366 | nb_pkts = xskq_cons_peek_desc_batch(xs->tx, descs, pool, max_entries); | |
367 | if (!nb_pkts) { | |
368 | xs->tx->queue_empty_descs++; | |
369 | goto out; | |
370 | } | |
371 | ||
372 | /* This is the backpressure mechanism for the Tx path. Try to | |
373 | * reserve space in the completion queue for all packets, but | |
374 | * if there are fewer slots available, just process that many | |
375 | * packets. This avoids having to implement any buffering in | |
376 | * the Tx path. | |
377 | */ | |
378 | nb_pkts = xskq_prod_reserve_addr_batch(pool->cq, descs, nb_pkts); | |
379 | if (!nb_pkts) | |
380 | goto out; | |
381 | ||
382 | xskq_cons_release_n(xs->tx, nb_pkts); | |
383 | __xskq_cons_release(xs->tx); | |
384 | xs->sk.sk_write_space(&xs->sk); | |
385 | ||
386 | out: | |
387 | rcu_read_unlock(); | |
388 | return nb_pkts; | |
389 | } | |
390 | EXPORT_SYMBOL(xsk_tx_peek_release_desc_batch); | |
391 | ||
06870682 | 392 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 393 | { |
ac98d8aa | 394 | struct net_device *dev = xs->dev; |
06870682 MM |
395 | int err; |
396 | ||
397 | rcu_read_lock(); | |
398 | err = dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); | |
399 | rcu_read_unlock(); | |
ac98d8aa | 400 | |
06870682 MM |
401 | return err; |
402 | } | |
403 | ||
404 | static int xsk_zc_xmit(struct xdp_sock *xs) | |
405 | { | |
406 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
ac98d8aa MK |
407 | } |
408 | ||
35fcde7f MK |
409 | static void xsk_destruct_skb(struct sk_buff *skb) |
410 | { | |
bbff2f32 | 411 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 412 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 413 | unsigned long flags; |
35fcde7f | 414 | |
a9744f7c | 415 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
7361f9c3 | 416 | xskq_prod_submit_addr(xs->pool->cq, addr); |
a9744f7c | 417 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
418 | |
419 | sock_wfree(skb); | |
420 | } | |
421 | ||
df551058 | 422 | static int xsk_generic_xmit(struct sock *sk) |
35fcde7f | 423 | { |
35fcde7f | 424 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 425 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
426 | bool sent_frame = false; |
427 | struct xdp_desc desc; | |
428 | struct sk_buff *skb; | |
429 | int err = 0; | |
430 | ||
35fcde7f MK |
431 | mutex_lock(&xs->mutex); |
432 | ||
67571640 IM |
433 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
434 | goto out; | |
435 | ||
1c1efc2a | 436 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
35fcde7f | 437 | char *buffer; |
bbff2f32 BT |
438 | u64 addr; |
439 | u32 len; | |
35fcde7f MK |
440 | |
441 | if (max_batch-- == 0) { | |
442 | err = -EAGAIN; | |
443 | goto out; | |
444 | } | |
445 | ||
09210c4b | 446 | len = desc.len; |
ac98d8aa | 447 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
aa2cad06 | 448 | if (unlikely(!skb)) |
35fcde7f | 449 | goto out; |
35fcde7f MK |
450 | |
451 | skb_put(skb, len); | |
bbff2f32 | 452 | addr = desc.addr; |
c4655761 | 453 | buffer = xsk_buff_raw_get_data(xs->pool, addr); |
35fcde7f | 454 | err = skb_store_bits(skb, 0, buffer, len); |
0a05861f | 455 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
456 | * Reserve space in the completion queue and only proceed |
457 | * if there is space in it. This avoids having to implement | |
458 | * any buffering in the Tx path. | |
459 | */ | |
7361f9c3 | 460 | if (unlikely(err) || xskq_prod_reserve(xs->pool->cq)) { |
35fcde7f MK |
461 | kfree_skb(skb); |
462 | goto out; | |
463 | } | |
464 | ||
465 | skb->dev = xs->dev; | |
466 | skb->priority = sk->sk_priority; | |
467 | skb->mark = sk->sk_mark; | |
c05cd364 | 468 | skb_shinfo(skb)->destructor_arg = (void *)(long)desc.addr; |
35fcde7f MK |
469 | skb->destructor = xsk_destruct_skb; |
470 | ||
642e450b MK |
471 | /* Hinder dev_direct_xmit from freeing the packet and |
472 | * therefore completing it in the destructor | |
473 | */ | |
474 | refcount_inc(&skb->users); | |
35fcde7f | 475 | err = dev_direct_xmit(skb, xs->queue_id); |
642e450b MK |
476 | if (err == NETDEV_TX_BUSY) { |
477 | /* Tell user-space to retry the send */ | |
478 | skb->destructor = sock_wfree; | |
479 | /* Free skb without triggering the perf drop trace */ | |
480 | consume_skb(skb); | |
481 | err = -EAGAIN; | |
482 | goto out; | |
483 | } | |
484 | ||
c5ed924b | 485 | xskq_cons_release(xs->tx); |
35fcde7f | 486 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
642e450b | 487 | if (err == NET_XMIT_DROP) { |
fe588685 | 488 | /* SKB completed but not sent */ |
642e450b | 489 | kfree_skb(skb); |
fe588685 | 490 | err = -EBUSY; |
35fcde7f MK |
491 | goto out; |
492 | } | |
493 | ||
642e450b | 494 | consume_skb(skb); |
35fcde7f | 495 | sent_frame = true; |
35fcde7f MK |
496 | } |
497 | ||
8aa5a335 CL |
498 | xs->tx->queue_empty_descs++; |
499 | ||
35fcde7f MK |
500 | out: |
501 | if (sent_frame) | |
502 | sk->sk_write_space(sk); | |
503 | ||
504 | mutex_unlock(&xs->mutex); | |
505 | return err; | |
506 | } | |
507 | ||
df551058 MK |
508 | static int __xsk_sendmsg(struct sock *sk) |
509 | { | |
510 | struct xdp_sock *xs = xdp_sk(sk); | |
511 | ||
512 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
513 | return -ENETDOWN; | |
514 | if (unlikely(!xs->tx)) | |
515 | return -ENOBUFS; | |
516 | ||
517 | return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk); | |
518 | } | |
519 | ||
35fcde7f MK |
520 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
521 | { | |
ac98d8aa | 522 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
523 | struct sock *sk = sock->sk; |
524 | struct xdp_sock *xs = xdp_sk(sk); | |
525 | ||
42fddcc7 | 526 | if (unlikely(!xsk_is_bound(xs))) |
35fcde7f | 527 | return -ENXIO; |
df551058 | 528 | if (unlikely(need_wait)) |
ac98d8aa | 529 | return -EOPNOTSUPP; |
35fcde7f | 530 | |
df551058 | 531 | return __xsk_sendmsg(sk); |
35fcde7f MK |
532 | } |
533 | ||
5d946c5a | 534 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 535 | struct poll_table_struct *wait) |
c497176c | 536 | { |
5d946c5a | 537 | __poll_t mask = datagram_poll(file, sock, wait); |
df551058 MK |
538 | struct sock *sk = sock->sk; |
539 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 540 | struct xsk_buff_pool *pool; |
42fddcc7 BT |
541 | |
542 | if (unlikely(!xsk_is_bound(xs))) | |
543 | return mask; | |
544 | ||
c2d3d6a4 | 545 | pool = xs->pool; |
77cd0d7b | 546 | |
c2d3d6a4 | 547 | if (pool->cached_need_wakeup) { |
06870682 | 548 | if (xs->zc) |
c2d3d6a4 | 549 | xsk_wakeup(xs, pool->cached_need_wakeup); |
df551058 MK |
550 | else |
551 | /* Poll needs to drive Tx also in copy mode */ | |
552 | __xsk_sendmsg(sk); | |
553 | } | |
c497176c | 554 | |
59e35e55 | 555 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 556 | mask |= EPOLLIN | EPOLLRDNORM; |
c5ed924b | 557 | if (xs->tx && !xskq_cons_is_full(xs->tx)) |
5d946c5a | 558 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c BT |
559 | |
560 | return mask; | |
561 | } | |
562 | ||
b9b6b68e BT |
563 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
564 | bool umem_queue) | |
423f3832 MK |
565 | { |
566 | struct xsk_queue *q; | |
567 | ||
568 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
569 | return -EINVAL; | |
570 | ||
b9b6b68e | 571 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
572 | if (!q) |
573 | return -ENOMEM; | |
574 | ||
37b07693 BT |
575 | /* Make sure queue is ready before it can be seen by others */ |
576 | smp_wmb(); | |
94a99763 | 577 | WRITE_ONCE(*queue, q); |
423f3832 MK |
578 | return 0; |
579 | } | |
580 | ||
455302d1 IM |
581 | static void xsk_unbind_dev(struct xdp_sock *xs) |
582 | { | |
583 | struct net_device *dev = xs->dev; | |
584 | ||
42fddcc7 | 585 | if (xs->state != XSK_BOUND) |
455302d1 | 586 | return; |
42fddcc7 | 587 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
588 | |
589 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 590 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
591 | xs->dev = NULL; |
592 | synchronize_net(); | |
593 | dev_put(dev); | |
594 | } | |
595 | ||
0402acd6 BT |
596 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
597 | struct xdp_sock ***map_entry) | |
598 | { | |
599 | struct xsk_map *map = NULL; | |
600 | struct xsk_map_node *node; | |
601 | ||
602 | *map_entry = NULL; | |
603 | ||
604 | spin_lock_bh(&xs->map_list_lock); | |
605 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
606 | node); | |
607 | if (node) { | |
bb1b25ca | 608 | bpf_map_inc(&node->map->map); |
0402acd6 BT |
609 | map = node->map; |
610 | *map_entry = node->map_entry; | |
611 | } | |
612 | spin_unlock_bh(&xs->map_list_lock); | |
613 | return map; | |
614 | } | |
615 | ||
616 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
617 | { | |
618 | /* This function removes the current XDP socket from all the | |
619 | * maps it resides in. We need to take extra care here, due to | |
620 | * the two locks involved. Each map has a lock synchronizing | |
621 | * updates to the entries, and each socket has a lock that | |
622 | * synchronizes access to the list of maps (map_list). For | |
623 | * deadlock avoidance the locks need to be taken in the order | |
624 | * "map lock"->"socket map list lock". We start off by | |
625 | * accessing the socket map list, and take a reference to the | |
626 | * map to guarantee existence between the | |
627 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
628 | * calls. Then we ask the map to remove the socket, which | |
629 | * tries to remove the socket from the map. Note that there | |
630 | * might be updates to the map between | |
631 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
632 | */ | |
633 | struct xdp_sock **map_entry = NULL; | |
634 | struct xsk_map *map; | |
635 | ||
636 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
637 | xsk_map_try_sock_delete(map, xs, map_entry); | |
bb1b25ca | 638 | bpf_map_put(&map->map); |
0402acd6 BT |
639 | } |
640 | } | |
641 | ||
c0c77d8f BT |
642 | static int xsk_release(struct socket *sock) |
643 | { | |
644 | struct sock *sk = sock->sk; | |
965a9909 | 645 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
646 | struct net *net; |
647 | ||
648 | if (!sk) | |
649 | return 0; | |
650 | ||
651 | net = sock_net(sk); | |
652 | ||
1d0dc069 BT |
653 | mutex_lock(&net->xdp.lock); |
654 | sk_del_node_init_rcu(sk); | |
655 | mutex_unlock(&net->xdp.lock); | |
656 | ||
c0c77d8f BT |
657 | local_bh_disable(); |
658 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
659 | local_bh_enable(); | |
660 | ||
0402acd6 | 661 | xsk_delete_from_maps(xs); |
42fddcc7 | 662 | mutex_lock(&xs->mutex); |
455302d1 | 663 | xsk_unbind_dev(xs); |
42fddcc7 | 664 | mutex_unlock(&xs->mutex); |
965a9909 | 665 | |
541d7fdd BT |
666 | xskq_destroy(xs->rx); |
667 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
668 | xskq_destroy(xs->fq_tmp); |
669 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 670 | |
c0c77d8f BT |
671 | sock_orphan(sk); |
672 | sock->sk = NULL; | |
673 | ||
674 | sk_refcnt_debug_release(sk); | |
675 | sock_put(sk); | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
965a9909 MK |
680 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
681 | { | |
682 | struct socket *sock; | |
683 | int err; | |
684 | ||
685 | sock = sockfd_lookup(fd, &err); | |
686 | if (!sock) | |
687 | return ERR_PTR(-ENOTSOCK); | |
688 | ||
689 | if (sock->sk->sk_family != PF_XDP) { | |
690 | sockfd_put(sock); | |
691 | return ERR_PTR(-ENOPROTOOPT); | |
692 | } | |
693 | ||
694 | return sock; | |
695 | } | |
696 | ||
7361f9c3 MK |
697 | static bool xsk_validate_queues(struct xdp_sock *xs) |
698 | { | |
699 | return xs->fq_tmp && xs->cq_tmp; | |
700 | } | |
701 | ||
965a9909 MK |
702 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
703 | { | |
704 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
705 | struct sock *sk = sock->sk; | |
965a9909 | 706 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 707 | struct net_device *dev; |
173d3adb | 708 | u32 flags, qid; |
965a9909 MK |
709 | int err = 0; |
710 | ||
711 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
712 | return -EINVAL; | |
713 | if (sxdp->sxdp_family != AF_XDP) | |
714 | return -EINVAL; | |
715 | ||
f54ba391 | 716 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
717 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
718 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
719 | return -EINVAL; |
720 | ||
5464c3a0 | 721 | rtnl_lock(); |
965a9909 | 722 | mutex_lock(&xs->mutex); |
455302d1 | 723 | if (xs->state != XSK_READY) { |
959b71db BT |
724 | err = -EBUSY; |
725 | goto out_release; | |
726 | } | |
727 | ||
965a9909 MK |
728 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
729 | if (!dev) { | |
730 | err = -ENODEV; | |
731 | goto out_release; | |
732 | } | |
733 | ||
f6145903 | 734 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
735 | err = -EINVAL; |
736 | goto out_unlock; | |
737 | } | |
738 | ||
173d3adb | 739 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
740 | |
741 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
742 | struct xdp_sock *umem_xs; |
743 | struct socket *sock; | |
744 | ||
77cd0d7b MK |
745 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
746 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
747 | /* Cannot specify flags for shared sockets. */ |
748 | err = -EINVAL; | |
749 | goto out_unlock; | |
750 | } | |
751 | ||
965a9909 MK |
752 | if (xs->umem) { |
753 | /* We have already our own. */ | |
754 | err = -EINVAL; | |
755 | goto out_unlock; | |
756 | } | |
757 | ||
758 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
759 | if (IS_ERR(sock)) { | |
760 | err = PTR_ERR(sock); | |
761 | goto out_unlock; | |
762 | } | |
763 | ||
764 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 765 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
766 | err = -EBADF; |
767 | sockfd_put(sock); | |
768 | goto out_unlock; | |
42fddcc7 | 769 | } |
965a9909 | 770 | |
a1132430 MK |
771 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
772 | /* Share the umem with another socket on another qid | |
773 | * and/or device. | |
774 | */ | |
b5aea28d MK |
775 | xs->pool = xp_create_and_assign_umem(xs, |
776 | umem_xs->umem); | |
777 | if (!xs->pool) { | |
1fd17c8c | 778 | err = -ENOMEM; |
b5aea28d MK |
779 | sockfd_put(sock); |
780 | goto out_unlock; | |
781 | } | |
782 | ||
783 | err = xp_assign_dev_shared(xs->pool, umem_xs->umem, | |
784 | dev, qid); | |
785 | if (err) { | |
786 | xp_destroy(xs->pool); | |
83cf5c68 | 787 | xs->pool = NULL; |
b5aea28d MK |
788 | sockfd_put(sock); |
789 | goto out_unlock; | |
790 | } | |
791 | } else { | |
792 | /* Share the buffer pool with the other socket. */ | |
793 | if (xs->fq_tmp || xs->cq_tmp) { | |
794 | /* Do not allow setting your own fq or cq. */ | |
795 | err = -EINVAL; | |
796 | sockfd_put(sock); | |
797 | goto out_unlock; | |
798 | } | |
799 | ||
800 | xp_get_pool(umem_xs->pool); | |
801 | xs->pool = umem_xs->pool; | |
802 | } | |
803 | ||
965a9909 | 804 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 805 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 806 | sockfd_put(sock); |
7361f9c3 | 807 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
808 | err = -EINVAL; |
809 | goto out_unlock; | |
c497176c BT |
810 | } else { |
811 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
812 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
813 | if (!xs->pool) { | |
814 | err = -ENOMEM; | |
173d3adb | 815 | goto out_unlock; |
1c1efc2a MK |
816 | } |
817 | ||
818 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
819 | if (err) { | |
820 | xp_destroy(xs->pool); | |
821 | xs->pool = NULL; | |
1c1efc2a MK |
822 | goto out_unlock; |
823 | } | |
965a9909 MK |
824 | } |
825 | ||
965a9909 | 826 | xs->dev = dev; |
ac98d8aa MK |
827 | xs->zc = xs->umem->zc; |
828 | xs->queue_id = qid; | |
a5aa8e52 | 829 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
830 | |
831 | out_unlock: | |
42fddcc7 | 832 | if (err) { |
965a9909 | 833 | dev_put(dev); |
42fddcc7 BT |
834 | } else { |
835 | /* Matches smp_rmb() in bind() for shared umem | |
836 | * sockets, and xsk_is_bound(). | |
837 | */ | |
838 | smp_wmb(); | |
839 | WRITE_ONCE(xs->state, XSK_BOUND); | |
840 | } | |
965a9909 MK |
841 | out_release: |
842 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 843 | rtnl_unlock(); |
965a9909 MK |
844 | return err; |
845 | } | |
846 | ||
c05cd364 KL |
847 | struct xdp_umem_reg_v1 { |
848 | __u64 addr; /* Start of packet data area */ | |
849 | __u64 len; /* Length of packet data area */ | |
850 | __u32 chunk_size; | |
851 | __u32 headroom; | |
852 | }; | |
853 | ||
c0c77d8f | 854 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 855 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
856 | { |
857 | struct sock *sk = sock->sk; | |
858 | struct xdp_sock *xs = xdp_sk(sk); | |
859 | int err; | |
860 | ||
861 | if (level != SOL_XDP) | |
862 | return -ENOPROTOOPT; | |
863 | ||
864 | switch (optname) { | |
b9b6b68e | 865 | case XDP_RX_RING: |
f6145903 | 866 | case XDP_TX_RING: |
b9b6b68e BT |
867 | { |
868 | struct xsk_queue **q; | |
869 | int entries; | |
870 | ||
871 | if (optlen < sizeof(entries)) | |
872 | return -EINVAL; | |
a7b75c5a | 873 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
874 | return -EFAULT; |
875 | ||
876 | mutex_lock(&xs->mutex); | |
455302d1 IM |
877 | if (xs->state != XSK_READY) { |
878 | mutex_unlock(&xs->mutex); | |
879 | return -EBUSY; | |
880 | } | |
f6145903 | 881 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 882 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
883 | if (!err && optname == XDP_TX_RING) |
884 | /* Tx needs to be explicitly woken up the first time */ | |
885 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
886 | mutex_unlock(&xs->mutex); |
887 | return err; | |
888 | } | |
c0c77d8f BT |
889 | case XDP_UMEM_REG: |
890 | { | |
c05cd364 KL |
891 | size_t mr_size = sizeof(struct xdp_umem_reg); |
892 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
893 | struct xdp_umem *umem; |
894 | ||
c05cd364 KL |
895 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
896 | return -EINVAL; | |
897 | else if (optlen < sizeof(mr)) | |
898 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
899 | ||
a7b75c5a | 900 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
901 | return -EFAULT; |
902 | ||
903 | mutex_lock(&xs->mutex); | |
455302d1 | 904 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
905 | mutex_unlock(&xs->mutex); |
906 | return -EBUSY; | |
907 | } | |
c0c77d8f | 908 | |
a49049ea BT |
909 | umem = xdp_umem_create(&mr); |
910 | if (IS_ERR(umem)) { | |
c0c77d8f | 911 | mutex_unlock(&xs->mutex); |
a49049ea | 912 | return PTR_ERR(umem); |
c0c77d8f BT |
913 | } |
914 | ||
915 | /* Make sure umem is ready before it can be seen by others */ | |
916 | smp_wmb(); | |
9764f4b3 | 917 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
918 | mutex_unlock(&xs->mutex); |
919 | return 0; | |
920 | } | |
423f3832 | 921 | case XDP_UMEM_FILL_RING: |
fe230832 | 922 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
923 | { |
924 | struct xsk_queue **q; | |
925 | int entries; | |
926 | ||
a7b75c5a | 927 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
928 | return -EFAULT; |
929 | ||
930 | mutex_lock(&xs->mutex); | |
455302d1 IM |
931 | if (xs->state != XSK_READY) { |
932 | mutex_unlock(&xs->mutex); | |
933 | return -EBUSY; | |
934 | } | |
a49049ea | 935 | |
7361f9c3 MK |
936 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
937 | &xs->cq_tmp; | |
b9b6b68e | 938 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
939 | mutex_unlock(&xs->mutex); |
940 | return err; | |
941 | } | |
c0c77d8f BT |
942 | default: |
943 | break; | |
944 | } | |
945 | ||
946 | return -ENOPROTOOPT; | |
947 | } | |
948 | ||
77cd0d7b MK |
949 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
950 | { | |
951 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
952 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
953 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
954 | } | |
955 | ||
956 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
957 | { | |
958 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
959 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
960 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
961 | } | |
962 | ||
8aa5a335 CL |
963 | struct xdp_statistics_v1 { |
964 | __u64 rx_dropped; | |
965 | __u64 rx_invalid_descs; | |
966 | __u64 tx_invalid_descs; | |
967 | }; | |
968 | ||
af75d9e0 MK |
969 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
970 | char __user *optval, int __user *optlen) | |
971 | { | |
972 | struct sock *sk = sock->sk; | |
973 | struct xdp_sock *xs = xdp_sk(sk); | |
974 | int len; | |
975 | ||
976 | if (level != SOL_XDP) | |
977 | return -ENOPROTOOPT; | |
978 | ||
979 | if (get_user(len, optlen)) | |
980 | return -EFAULT; | |
981 | if (len < 0) | |
982 | return -EINVAL; | |
983 | ||
984 | switch (optname) { | |
985 | case XDP_STATISTICS: | |
986 | { | |
3c4f850e | 987 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
988 | bool extra_stats = true; |
989 | size_t stats_size; | |
af75d9e0 | 990 | |
8aa5a335 | 991 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 992 | return -EINVAL; |
8aa5a335 CL |
993 | } else if (len < sizeof(stats)) { |
994 | extra_stats = false; | |
995 | stats_size = sizeof(struct xdp_statistics_v1); | |
996 | } else { | |
997 | stats_size = sizeof(stats); | |
998 | } | |
af75d9e0 MK |
999 | |
1000 | mutex_lock(&xs->mutex); | |
1001 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
1002 | if (extra_stats) { |
1003 | stats.rx_ring_full = xs->rx_queue_full; | |
1004 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 1005 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
1006 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
1007 | } else { | |
1008 | stats.rx_dropped += xs->rx_queue_full; | |
1009 | } | |
af75d9e0 MK |
1010 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
1011 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
1012 | mutex_unlock(&xs->mutex); | |
1013 | ||
8aa5a335 | 1014 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 1015 | return -EFAULT; |
8aa5a335 | 1016 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
1017 | return -EFAULT; |
1018 | ||
1019 | return 0; | |
1020 | } | |
b3a9e0be BT |
1021 | case XDP_MMAP_OFFSETS: |
1022 | { | |
1023 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
1024 | struct xdp_mmap_offsets_v1 off_v1; |
1025 | bool flags_supported = true; | |
1026 | void *to_copy; | |
b3a9e0be | 1027 | |
77cd0d7b | 1028 | if (len < sizeof(off_v1)) |
b3a9e0be | 1029 | return -EINVAL; |
77cd0d7b MK |
1030 | else if (len < sizeof(off)) |
1031 | flags_supported = false; | |
1032 | ||
1033 | if (flags_supported) { | |
1034 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
1035 | * except for the flags field added to the end. | |
1036 | */ | |
1037 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1038 | &off.rx); | |
1039 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1040 | &off.tx); | |
1041 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1042 | &off.fr); | |
1043 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1044 | &off.cr); | |
1045 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
1046 | ptrs.flags); | |
1047 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
1048 | ptrs.flags); | |
1049 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
1050 | ptrs.flags); | |
1051 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
1052 | ptrs.flags); | |
1053 | ||
1054 | len = sizeof(off); | |
1055 | to_copy = &off; | |
1056 | } else { | |
1057 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
1058 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
1059 | xsk_enter_umem_offsets(&off_v1.fr); | |
1060 | xsk_enter_umem_offsets(&off_v1.cr); | |
1061 | ||
1062 | len = sizeof(off_v1); | |
1063 | to_copy = &off_v1; | |
1064 | } | |
b3a9e0be | 1065 | |
77cd0d7b | 1066 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
1067 | return -EFAULT; |
1068 | if (put_user(len, optlen)) | |
1069 | return -EFAULT; | |
1070 | ||
1071 | return 0; | |
1072 | } | |
2640d3c8 MM |
1073 | case XDP_OPTIONS: |
1074 | { | |
1075 | struct xdp_options opts = {}; | |
1076 | ||
1077 | if (len < sizeof(opts)) | |
1078 | return -EINVAL; | |
1079 | ||
1080 | mutex_lock(&xs->mutex); | |
1081 | if (xs->zc) | |
1082 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1083 | mutex_unlock(&xs->mutex); | |
1084 | ||
1085 | len = sizeof(opts); | |
1086 | if (copy_to_user(optval, &opts, len)) | |
1087 | return -EFAULT; | |
1088 | if (put_user(len, optlen)) | |
1089 | return -EFAULT; | |
1090 | ||
1091 | return 0; | |
1092 | } | |
af75d9e0 MK |
1093 | default: |
1094 | break; | |
1095 | } | |
1096 | ||
1097 | return -EOPNOTSUPP; | |
1098 | } | |
1099 | ||
423f3832 MK |
1100 | static int xsk_mmap(struct file *file, struct socket *sock, |
1101 | struct vm_area_struct *vma) | |
1102 | { | |
a5a16e43 | 1103 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1104 | unsigned long size = vma->vm_end - vma->vm_start; |
1105 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
1106 | struct xsk_queue *q = NULL; | |
1107 | unsigned long pfn; | |
1108 | struct page *qpg; | |
1109 | ||
42fddcc7 | 1110 | if (READ_ONCE(xs->state) != XSK_READY) |
455302d1 IM |
1111 | return -EBUSY; |
1112 | ||
b9b6b68e | 1113 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1114 | q = READ_ONCE(xs->rx); |
f6145903 | 1115 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1116 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1117 | } else { |
e6762c8b MK |
1118 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1119 | smp_rmb(); | |
b9b6b68e | 1120 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
7361f9c3 | 1121 | q = READ_ONCE(xs->fq_tmp); |
fe230832 | 1122 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
7361f9c3 | 1123 | q = READ_ONCE(xs->cq_tmp); |
b9b6b68e | 1124 | } |
423f3832 MK |
1125 | |
1126 | if (!q) | |
1127 | return -EINVAL; | |
1128 | ||
e6762c8b MK |
1129 | /* Matches the smp_wmb() in xsk_init_queue */ |
1130 | smp_rmb(); | |
423f3832 | 1131 | qpg = virt_to_head_page(q->ring); |
a50b854e | 1132 | if (size > page_size(qpg)) |
423f3832 MK |
1133 | return -EINVAL; |
1134 | ||
1135 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
1136 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
1137 | size, vma->vm_page_prot); | |
1138 | } | |
1139 | ||
455302d1 IM |
1140 | static int xsk_notifier(struct notifier_block *this, |
1141 | unsigned long msg, void *ptr) | |
1142 | { | |
1143 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1144 | struct net *net = dev_net(dev); | |
1145 | struct sock *sk; | |
1146 | ||
1147 | switch (msg) { | |
1148 | case NETDEV_UNREGISTER: | |
1149 | mutex_lock(&net->xdp.lock); | |
1150 | sk_for_each(sk, &net->xdp.list) { | |
1151 | struct xdp_sock *xs = xdp_sk(sk); | |
1152 | ||
1153 | mutex_lock(&xs->mutex); | |
1154 | if (xs->dev == dev) { | |
1155 | sk->sk_err = ENETDOWN; | |
1156 | if (!sock_flag(sk, SOCK_DEAD)) | |
1157 | sk->sk_error_report(sk); | |
1158 | ||
1159 | xsk_unbind_dev(xs); | |
1160 | ||
1c1efc2a MK |
1161 | /* Clear device references. */ |
1162 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1163 | } |
1164 | mutex_unlock(&xs->mutex); | |
1165 | } | |
1166 | mutex_unlock(&net->xdp.lock); | |
1167 | break; | |
1168 | } | |
1169 | return NOTIFY_DONE; | |
1170 | } | |
1171 | ||
c0c77d8f BT |
1172 | static struct proto xsk_proto = { |
1173 | .name = "XDP", | |
1174 | .owner = THIS_MODULE, | |
1175 | .obj_size = sizeof(struct xdp_sock), | |
1176 | }; | |
1177 | ||
1178 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1179 | .family = PF_XDP, |
1180 | .owner = THIS_MODULE, | |
1181 | .release = xsk_release, | |
1182 | .bind = xsk_bind, | |
1183 | .connect = sock_no_connect, | |
1184 | .socketpair = sock_no_socketpair, | |
1185 | .accept = sock_no_accept, | |
1186 | .getname = sock_no_getname, | |
a11e1d43 | 1187 | .poll = xsk_poll, |
c2f4374b BT |
1188 | .ioctl = sock_no_ioctl, |
1189 | .listen = sock_no_listen, | |
1190 | .shutdown = sock_no_shutdown, | |
1191 | .setsockopt = xsk_setsockopt, | |
1192 | .getsockopt = xsk_getsockopt, | |
1193 | .sendmsg = xsk_sendmsg, | |
1194 | .recvmsg = sock_no_recvmsg, | |
1195 | .mmap = xsk_mmap, | |
1196 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1197 | }; |
1198 | ||
11fe9262 BT |
1199 | static void xsk_destruct(struct sock *sk) |
1200 | { | |
1201 | struct xdp_sock *xs = xdp_sk(sk); | |
1202 | ||
1203 | if (!sock_flag(sk, SOCK_DEAD)) | |
1204 | return; | |
1205 | ||
e5e1a4bc MK |
1206 | if (!xp_put_pool(xs->pool)) |
1207 | xdp_put_umem(xs->umem); | |
11fe9262 BT |
1208 | |
1209 | sk_refcnt_debug_dec(sk); | |
1210 | } | |
1211 | ||
c0c77d8f BT |
1212 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1213 | int kern) | |
1214 | { | |
c0c77d8f | 1215 | struct xdp_sock *xs; |
1c1efc2a | 1216 | struct sock *sk; |
c0c77d8f BT |
1217 | |
1218 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1219 | return -EPERM; | |
1220 | if (sock->type != SOCK_RAW) | |
1221 | return -ESOCKTNOSUPPORT; | |
1222 | ||
1223 | if (protocol) | |
1224 | return -EPROTONOSUPPORT; | |
1225 | ||
1226 | sock->state = SS_UNCONNECTED; | |
1227 | ||
1228 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1229 | if (!sk) | |
1230 | return -ENOBUFS; | |
1231 | ||
1232 | sock->ops = &xsk_proto_ops; | |
1233 | ||
1234 | sock_init_data(sock, sk); | |
1235 | ||
1236 | sk->sk_family = PF_XDP; | |
1237 | ||
11fe9262 BT |
1238 | sk->sk_destruct = xsk_destruct; |
1239 | sk_refcnt_debug_inc(sk); | |
1240 | ||
cee27167 BT |
1241 | sock_set_flag(sk, SOCK_RCU_FREE); |
1242 | ||
c0c77d8f | 1243 | xs = xdp_sk(sk); |
455302d1 | 1244 | xs->state = XSK_READY; |
c0c77d8f | 1245 | mutex_init(&xs->mutex); |
bf0bdd13 | 1246 | spin_lock_init(&xs->rx_lock); |
a9744f7c | 1247 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f | 1248 | |
0402acd6 BT |
1249 | INIT_LIST_HEAD(&xs->map_list); |
1250 | spin_lock_init(&xs->map_list_lock); | |
1251 | ||
1d0dc069 BT |
1252 | mutex_lock(&net->xdp.lock); |
1253 | sk_add_node_rcu(sk, &net->xdp.list); | |
1254 | mutex_unlock(&net->xdp.lock); | |
1255 | ||
c0c77d8f BT |
1256 | local_bh_disable(); |
1257 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
1258 | local_bh_enable(); | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static const struct net_proto_family xsk_family_ops = { | |
1264 | .family = PF_XDP, | |
1265 | .create = xsk_create, | |
1266 | .owner = THIS_MODULE, | |
1267 | }; | |
1268 | ||
455302d1 IM |
1269 | static struct notifier_block xsk_netdev_notifier = { |
1270 | .notifier_call = xsk_notifier, | |
1271 | }; | |
1272 | ||
1d0dc069 BT |
1273 | static int __net_init xsk_net_init(struct net *net) |
1274 | { | |
1275 | mutex_init(&net->xdp.lock); | |
1276 | INIT_HLIST_HEAD(&net->xdp.list); | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | static void __net_exit xsk_net_exit(struct net *net) | |
1281 | { | |
1282 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1283 | } | |
1284 | ||
1285 | static struct pernet_operations xsk_net_ops = { | |
1286 | .init = xsk_net_init, | |
1287 | .exit = xsk_net_exit, | |
1288 | }; | |
1289 | ||
c0c77d8f BT |
1290 | static int __init xsk_init(void) |
1291 | { | |
e312b9e7 | 1292 | int err, cpu; |
c0c77d8f BT |
1293 | |
1294 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1295 | if (err) | |
1296 | goto out; | |
1297 | ||
1298 | err = sock_register(&xsk_family_ops); | |
1299 | if (err) | |
1300 | goto out_proto; | |
1301 | ||
1d0dc069 BT |
1302 | err = register_pernet_subsys(&xsk_net_ops); |
1303 | if (err) | |
1304 | goto out_sk; | |
455302d1 IM |
1305 | |
1306 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1307 | if (err) | |
1308 | goto out_pernet; | |
1309 | ||
e312b9e7 BT |
1310 | for_each_possible_cpu(cpu) |
1311 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1312 | return 0; |
1313 | ||
455302d1 IM |
1314 | out_pernet: |
1315 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1316 | out_sk: |
1317 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1318 | out_proto: |
1319 | proto_unregister(&xsk_proto); | |
1320 | out: | |
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | fs_initcall(xsk_init); |