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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 | |
06870682 | 335 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 336 | { |
ac98d8aa | 337 | struct net_device *dev = xs->dev; |
06870682 MM |
338 | int err; |
339 | ||
340 | rcu_read_lock(); | |
341 | err = dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); | |
342 | rcu_read_unlock(); | |
ac98d8aa | 343 | |
06870682 MM |
344 | return err; |
345 | } | |
346 | ||
347 | static int xsk_zc_xmit(struct xdp_sock *xs) | |
348 | { | |
349 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
ac98d8aa MK |
350 | } |
351 | ||
35fcde7f MK |
352 | static void xsk_destruct_skb(struct sk_buff *skb) |
353 | { | |
bbff2f32 | 354 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 355 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 356 | unsigned long flags; |
35fcde7f | 357 | |
a9744f7c | 358 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
7361f9c3 | 359 | xskq_prod_submit_addr(xs->pool->cq, addr); |
a9744f7c | 360 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
361 | |
362 | sock_wfree(skb); | |
363 | } | |
364 | ||
df551058 | 365 | static int xsk_generic_xmit(struct sock *sk) |
35fcde7f | 366 | { |
35fcde7f | 367 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 368 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
369 | bool sent_frame = false; |
370 | struct xdp_desc desc; | |
371 | struct sk_buff *skb; | |
372 | int err = 0; | |
373 | ||
35fcde7f MK |
374 | mutex_lock(&xs->mutex); |
375 | ||
67571640 IM |
376 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
377 | goto out; | |
378 | ||
1c1efc2a | 379 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
35fcde7f | 380 | char *buffer; |
bbff2f32 BT |
381 | u64 addr; |
382 | u32 len; | |
35fcde7f MK |
383 | |
384 | if (max_batch-- == 0) { | |
385 | err = -EAGAIN; | |
386 | goto out; | |
387 | } | |
388 | ||
09210c4b | 389 | len = desc.len; |
ac98d8aa | 390 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
aa2cad06 | 391 | if (unlikely(!skb)) |
35fcde7f | 392 | goto out; |
35fcde7f MK |
393 | |
394 | skb_put(skb, len); | |
bbff2f32 | 395 | addr = desc.addr; |
c4655761 | 396 | buffer = xsk_buff_raw_get_data(xs->pool, addr); |
35fcde7f | 397 | err = skb_store_bits(skb, 0, buffer, len); |
0a05861f | 398 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
399 | * Reserve space in the completion queue and only proceed |
400 | * if there is space in it. This avoids having to implement | |
401 | * any buffering in the Tx path. | |
402 | */ | |
7361f9c3 | 403 | if (unlikely(err) || xskq_prod_reserve(xs->pool->cq)) { |
35fcde7f MK |
404 | kfree_skb(skb); |
405 | goto out; | |
406 | } | |
407 | ||
408 | skb->dev = xs->dev; | |
409 | skb->priority = sk->sk_priority; | |
410 | skb->mark = sk->sk_mark; | |
c05cd364 | 411 | skb_shinfo(skb)->destructor_arg = (void *)(long)desc.addr; |
35fcde7f MK |
412 | skb->destructor = xsk_destruct_skb; |
413 | ||
414 | err = dev_direct_xmit(skb, xs->queue_id); | |
c5ed924b | 415 | xskq_cons_release(xs->tx); |
35fcde7f MK |
416 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
417 | if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { | |
fe588685 MK |
418 | /* SKB completed but not sent */ |
419 | err = -EBUSY; | |
35fcde7f MK |
420 | goto out; |
421 | } | |
422 | ||
423 | sent_frame = true; | |
35fcde7f MK |
424 | } |
425 | ||
8aa5a335 CL |
426 | xs->tx->queue_empty_descs++; |
427 | ||
35fcde7f MK |
428 | out: |
429 | if (sent_frame) | |
430 | sk->sk_write_space(sk); | |
431 | ||
432 | mutex_unlock(&xs->mutex); | |
433 | return err; | |
434 | } | |
435 | ||
df551058 MK |
436 | static int __xsk_sendmsg(struct sock *sk) |
437 | { | |
438 | struct xdp_sock *xs = xdp_sk(sk); | |
439 | ||
440 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
441 | return -ENETDOWN; | |
442 | if (unlikely(!xs->tx)) | |
443 | return -ENOBUFS; | |
444 | ||
445 | return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk); | |
446 | } | |
447 | ||
35fcde7f MK |
448 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
449 | { | |
ac98d8aa | 450 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
451 | struct sock *sk = sock->sk; |
452 | struct xdp_sock *xs = xdp_sk(sk); | |
453 | ||
42fddcc7 | 454 | if (unlikely(!xsk_is_bound(xs))) |
35fcde7f | 455 | return -ENXIO; |
df551058 | 456 | if (unlikely(need_wait)) |
ac98d8aa | 457 | return -EOPNOTSUPP; |
35fcde7f | 458 | |
df551058 | 459 | return __xsk_sendmsg(sk); |
35fcde7f MK |
460 | } |
461 | ||
5d946c5a | 462 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 463 | struct poll_table_struct *wait) |
c497176c | 464 | { |
5d946c5a | 465 | __poll_t mask = datagram_poll(file, sock, wait); |
df551058 MK |
466 | struct sock *sk = sock->sk; |
467 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 468 | struct xsk_buff_pool *pool; |
42fddcc7 BT |
469 | |
470 | if (unlikely(!xsk_is_bound(xs))) | |
471 | return mask; | |
472 | ||
c2d3d6a4 | 473 | pool = xs->pool; |
77cd0d7b | 474 | |
c2d3d6a4 | 475 | if (pool->cached_need_wakeup) { |
06870682 | 476 | if (xs->zc) |
c2d3d6a4 | 477 | xsk_wakeup(xs, pool->cached_need_wakeup); |
df551058 MK |
478 | else |
479 | /* Poll needs to drive Tx also in copy mode */ | |
480 | __xsk_sendmsg(sk); | |
481 | } | |
c497176c | 482 | |
59e35e55 | 483 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 484 | mask |= EPOLLIN | EPOLLRDNORM; |
c5ed924b | 485 | if (xs->tx && !xskq_cons_is_full(xs->tx)) |
5d946c5a | 486 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c BT |
487 | |
488 | return mask; | |
489 | } | |
490 | ||
b9b6b68e BT |
491 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
492 | bool umem_queue) | |
423f3832 MK |
493 | { |
494 | struct xsk_queue *q; | |
495 | ||
496 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
497 | return -EINVAL; | |
498 | ||
b9b6b68e | 499 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
500 | if (!q) |
501 | return -ENOMEM; | |
502 | ||
37b07693 BT |
503 | /* Make sure queue is ready before it can be seen by others */ |
504 | smp_wmb(); | |
94a99763 | 505 | WRITE_ONCE(*queue, q); |
423f3832 MK |
506 | return 0; |
507 | } | |
508 | ||
455302d1 IM |
509 | static void xsk_unbind_dev(struct xdp_sock *xs) |
510 | { | |
511 | struct net_device *dev = xs->dev; | |
512 | ||
42fddcc7 | 513 | if (xs->state != XSK_BOUND) |
455302d1 | 514 | return; |
42fddcc7 | 515 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
516 | |
517 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 518 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
519 | xs->dev = NULL; |
520 | synchronize_net(); | |
521 | dev_put(dev); | |
522 | } | |
523 | ||
0402acd6 BT |
524 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
525 | struct xdp_sock ***map_entry) | |
526 | { | |
527 | struct xsk_map *map = NULL; | |
528 | struct xsk_map_node *node; | |
529 | ||
530 | *map_entry = NULL; | |
531 | ||
532 | spin_lock_bh(&xs->map_list_lock); | |
533 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
534 | node); | |
535 | if (node) { | |
536 | WARN_ON(xsk_map_inc(node->map)); | |
537 | map = node->map; | |
538 | *map_entry = node->map_entry; | |
539 | } | |
540 | spin_unlock_bh(&xs->map_list_lock); | |
541 | return map; | |
542 | } | |
543 | ||
544 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
545 | { | |
546 | /* This function removes the current XDP socket from all the | |
547 | * maps it resides in. We need to take extra care here, due to | |
548 | * the two locks involved. Each map has a lock synchronizing | |
549 | * updates to the entries, and each socket has a lock that | |
550 | * synchronizes access to the list of maps (map_list). For | |
551 | * deadlock avoidance the locks need to be taken in the order | |
552 | * "map lock"->"socket map list lock". We start off by | |
553 | * accessing the socket map list, and take a reference to the | |
554 | * map to guarantee existence between the | |
555 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
556 | * calls. Then we ask the map to remove the socket, which | |
557 | * tries to remove the socket from the map. Note that there | |
558 | * might be updates to the map between | |
559 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
560 | */ | |
561 | struct xdp_sock **map_entry = NULL; | |
562 | struct xsk_map *map; | |
563 | ||
564 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
565 | xsk_map_try_sock_delete(map, xs, map_entry); | |
566 | xsk_map_put(map); | |
567 | } | |
568 | } | |
569 | ||
c0c77d8f BT |
570 | static int xsk_release(struct socket *sock) |
571 | { | |
572 | struct sock *sk = sock->sk; | |
965a9909 | 573 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
574 | struct net *net; |
575 | ||
576 | if (!sk) | |
577 | return 0; | |
578 | ||
579 | net = sock_net(sk); | |
580 | ||
1d0dc069 BT |
581 | mutex_lock(&net->xdp.lock); |
582 | sk_del_node_init_rcu(sk); | |
583 | mutex_unlock(&net->xdp.lock); | |
584 | ||
c0c77d8f BT |
585 | local_bh_disable(); |
586 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
587 | local_bh_enable(); | |
588 | ||
0402acd6 | 589 | xsk_delete_from_maps(xs); |
42fddcc7 | 590 | mutex_lock(&xs->mutex); |
455302d1 | 591 | xsk_unbind_dev(xs); |
42fddcc7 | 592 | mutex_unlock(&xs->mutex); |
965a9909 | 593 | |
541d7fdd BT |
594 | xskq_destroy(xs->rx); |
595 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
596 | xskq_destroy(xs->fq_tmp); |
597 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 598 | |
c0c77d8f BT |
599 | sock_orphan(sk); |
600 | sock->sk = NULL; | |
601 | ||
602 | sk_refcnt_debug_release(sk); | |
603 | sock_put(sk); | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
965a9909 MK |
608 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
609 | { | |
610 | struct socket *sock; | |
611 | int err; | |
612 | ||
613 | sock = sockfd_lookup(fd, &err); | |
614 | if (!sock) | |
615 | return ERR_PTR(-ENOTSOCK); | |
616 | ||
617 | if (sock->sk->sk_family != PF_XDP) { | |
618 | sockfd_put(sock); | |
619 | return ERR_PTR(-ENOPROTOOPT); | |
620 | } | |
621 | ||
622 | return sock; | |
623 | } | |
624 | ||
7361f9c3 MK |
625 | static bool xsk_validate_queues(struct xdp_sock *xs) |
626 | { | |
627 | return xs->fq_tmp && xs->cq_tmp; | |
628 | } | |
629 | ||
965a9909 MK |
630 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
631 | { | |
632 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
633 | struct sock *sk = sock->sk; | |
965a9909 | 634 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 635 | struct net_device *dev; |
173d3adb | 636 | u32 flags, qid; |
965a9909 MK |
637 | int err = 0; |
638 | ||
639 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
640 | return -EINVAL; | |
641 | if (sxdp->sxdp_family != AF_XDP) | |
642 | return -EINVAL; | |
643 | ||
f54ba391 | 644 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
645 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
646 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
647 | return -EINVAL; |
648 | ||
5464c3a0 | 649 | rtnl_lock(); |
965a9909 | 650 | mutex_lock(&xs->mutex); |
455302d1 | 651 | if (xs->state != XSK_READY) { |
959b71db BT |
652 | err = -EBUSY; |
653 | goto out_release; | |
654 | } | |
655 | ||
965a9909 MK |
656 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
657 | if (!dev) { | |
658 | err = -ENODEV; | |
659 | goto out_release; | |
660 | } | |
661 | ||
f6145903 | 662 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
663 | err = -EINVAL; |
664 | goto out_unlock; | |
665 | } | |
666 | ||
173d3adb | 667 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
668 | |
669 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
670 | struct xdp_sock *umem_xs; |
671 | struct socket *sock; | |
672 | ||
77cd0d7b MK |
673 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
674 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
675 | /* Cannot specify flags for shared sockets. */ |
676 | err = -EINVAL; | |
677 | goto out_unlock; | |
678 | } | |
679 | ||
965a9909 MK |
680 | if (xs->umem) { |
681 | /* We have already our own. */ | |
682 | err = -EINVAL; | |
683 | goto out_unlock; | |
684 | } | |
685 | ||
686 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
687 | if (IS_ERR(sock)) { | |
688 | err = PTR_ERR(sock); | |
689 | goto out_unlock; | |
690 | } | |
691 | ||
692 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 693 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
694 | err = -EBADF; |
695 | sockfd_put(sock); | |
696 | goto out_unlock; | |
42fddcc7 | 697 | } |
965a9909 | 698 | |
a1132430 MK |
699 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
700 | /* Share the umem with another socket on another qid | |
701 | * and/or device. | |
702 | */ | |
b5aea28d MK |
703 | xs->pool = xp_create_and_assign_umem(xs, |
704 | umem_xs->umem); | |
705 | if (!xs->pool) { | |
706 | sockfd_put(sock); | |
707 | goto out_unlock; | |
708 | } | |
709 | ||
710 | err = xp_assign_dev_shared(xs->pool, umem_xs->umem, | |
711 | dev, qid); | |
712 | if (err) { | |
713 | xp_destroy(xs->pool); | |
714 | sockfd_put(sock); | |
715 | goto out_unlock; | |
716 | } | |
717 | } else { | |
718 | /* Share the buffer pool with the other socket. */ | |
719 | if (xs->fq_tmp || xs->cq_tmp) { | |
720 | /* Do not allow setting your own fq or cq. */ | |
721 | err = -EINVAL; | |
722 | sockfd_put(sock); | |
723 | goto out_unlock; | |
724 | } | |
725 | ||
726 | xp_get_pool(umem_xs->pool); | |
727 | xs->pool = umem_xs->pool; | |
728 | } | |
729 | ||
965a9909 | 730 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 731 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 732 | sockfd_put(sock); |
7361f9c3 | 733 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
734 | err = -EINVAL; |
735 | goto out_unlock; | |
c497176c BT |
736 | } else { |
737 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
738 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
739 | if (!xs->pool) { | |
740 | err = -ENOMEM; | |
173d3adb | 741 | goto out_unlock; |
1c1efc2a MK |
742 | } |
743 | ||
744 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
745 | if (err) { | |
746 | xp_destroy(xs->pool); | |
747 | xs->pool = NULL; | |
1c1efc2a MK |
748 | goto out_unlock; |
749 | } | |
965a9909 MK |
750 | } |
751 | ||
965a9909 | 752 | xs->dev = dev; |
ac98d8aa MK |
753 | xs->zc = xs->umem->zc; |
754 | xs->queue_id = qid; | |
a5aa8e52 | 755 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
756 | |
757 | out_unlock: | |
42fddcc7 | 758 | if (err) { |
965a9909 | 759 | dev_put(dev); |
42fddcc7 BT |
760 | } else { |
761 | /* Matches smp_rmb() in bind() for shared umem | |
762 | * sockets, and xsk_is_bound(). | |
763 | */ | |
764 | smp_wmb(); | |
765 | WRITE_ONCE(xs->state, XSK_BOUND); | |
766 | } | |
965a9909 MK |
767 | out_release: |
768 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 769 | rtnl_unlock(); |
965a9909 MK |
770 | return err; |
771 | } | |
772 | ||
c05cd364 KL |
773 | struct xdp_umem_reg_v1 { |
774 | __u64 addr; /* Start of packet data area */ | |
775 | __u64 len; /* Length of packet data area */ | |
776 | __u32 chunk_size; | |
777 | __u32 headroom; | |
778 | }; | |
779 | ||
c0c77d8f | 780 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 781 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
782 | { |
783 | struct sock *sk = sock->sk; | |
784 | struct xdp_sock *xs = xdp_sk(sk); | |
785 | int err; | |
786 | ||
787 | if (level != SOL_XDP) | |
788 | return -ENOPROTOOPT; | |
789 | ||
790 | switch (optname) { | |
b9b6b68e | 791 | case XDP_RX_RING: |
f6145903 | 792 | case XDP_TX_RING: |
b9b6b68e BT |
793 | { |
794 | struct xsk_queue **q; | |
795 | int entries; | |
796 | ||
797 | if (optlen < sizeof(entries)) | |
798 | return -EINVAL; | |
a7b75c5a | 799 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
800 | return -EFAULT; |
801 | ||
802 | mutex_lock(&xs->mutex); | |
455302d1 IM |
803 | if (xs->state != XSK_READY) { |
804 | mutex_unlock(&xs->mutex); | |
805 | return -EBUSY; | |
806 | } | |
f6145903 | 807 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 808 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
809 | if (!err && optname == XDP_TX_RING) |
810 | /* Tx needs to be explicitly woken up the first time */ | |
811 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
812 | mutex_unlock(&xs->mutex); |
813 | return err; | |
814 | } | |
c0c77d8f BT |
815 | case XDP_UMEM_REG: |
816 | { | |
c05cd364 KL |
817 | size_t mr_size = sizeof(struct xdp_umem_reg); |
818 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
819 | struct xdp_umem *umem; |
820 | ||
c05cd364 KL |
821 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
822 | return -EINVAL; | |
823 | else if (optlen < sizeof(mr)) | |
824 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
825 | ||
a7b75c5a | 826 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
827 | return -EFAULT; |
828 | ||
829 | mutex_lock(&xs->mutex); | |
455302d1 | 830 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
831 | mutex_unlock(&xs->mutex); |
832 | return -EBUSY; | |
833 | } | |
c0c77d8f | 834 | |
a49049ea BT |
835 | umem = xdp_umem_create(&mr); |
836 | if (IS_ERR(umem)) { | |
c0c77d8f | 837 | mutex_unlock(&xs->mutex); |
a49049ea | 838 | return PTR_ERR(umem); |
c0c77d8f BT |
839 | } |
840 | ||
841 | /* Make sure umem is ready before it can be seen by others */ | |
842 | smp_wmb(); | |
9764f4b3 | 843 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
844 | mutex_unlock(&xs->mutex); |
845 | return 0; | |
846 | } | |
423f3832 | 847 | case XDP_UMEM_FILL_RING: |
fe230832 | 848 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
849 | { |
850 | struct xsk_queue **q; | |
851 | int entries; | |
852 | ||
a7b75c5a | 853 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
854 | return -EFAULT; |
855 | ||
856 | mutex_lock(&xs->mutex); | |
455302d1 IM |
857 | if (xs->state != XSK_READY) { |
858 | mutex_unlock(&xs->mutex); | |
859 | return -EBUSY; | |
860 | } | |
a49049ea | 861 | |
7361f9c3 MK |
862 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
863 | &xs->cq_tmp; | |
b9b6b68e | 864 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
865 | mutex_unlock(&xs->mutex); |
866 | return err; | |
867 | } | |
c0c77d8f BT |
868 | default: |
869 | break; | |
870 | } | |
871 | ||
872 | return -ENOPROTOOPT; | |
873 | } | |
874 | ||
77cd0d7b MK |
875 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
876 | { | |
877 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
878 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
879 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
880 | } | |
881 | ||
882 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
883 | { | |
884 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
885 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
886 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
887 | } | |
888 | ||
8aa5a335 CL |
889 | struct xdp_statistics_v1 { |
890 | __u64 rx_dropped; | |
891 | __u64 rx_invalid_descs; | |
892 | __u64 tx_invalid_descs; | |
893 | }; | |
894 | ||
af75d9e0 MK |
895 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
896 | char __user *optval, int __user *optlen) | |
897 | { | |
898 | struct sock *sk = sock->sk; | |
899 | struct xdp_sock *xs = xdp_sk(sk); | |
900 | int len; | |
901 | ||
902 | if (level != SOL_XDP) | |
903 | return -ENOPROTOOPT; | |
904 | ||
905 | if (get_user(len, optlen)) | |
906 | return -EFAULT; | |
907 | if (len < 0) | |
908 | return -EINVAL; | |
909 | ||
910 | switch (optname) { | |
911 | case XDP_STATISTICS: | |
912 | { | |
3c4f850e | 913 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
914 | bool extra_stats = true; |
915 | size_t stats_size; | |
af75d9e0 | 916 | |
8aa5a335 | 917 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 918 | return -EINVAL; |
8aa5a335 CL |
919 | } else if (len < sizeof(stats)) { |
920 | extra_stats = false; | |
921 | stats_size = sizeof(struct xdp_statistics_v1); | |
922 | } else { | |
923 | stats_size = sizeof(stats); | |
924 | } | |
af75d9e0 MK |
925 | |
926 | mutex_lock(&xs->mutex); | |
927 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
928 | if (extra_stats) { |
929 | stats.rx_ring_full = xs->rx_queue_full; | |
930 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 931 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
932 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
933 | } else { | |
934 | stats.rx_dropped += xs->rx_queue_full; | |
935 | } | |
af75d9e0 MK |
936 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
937 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
938 | mutex_unlock(&xs->mutex); | |
939 | ||
8aa5a335 | 940 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 941 | return -EFAULT; |
8aa5a335 | 942 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
943 | return -EFAULT; |
944 | ||
945 | return 0; | |
946 | } | |
b3a9e0be BT |
947 | case XDP_MMAP_OFFSETS: |
948 | { | |
949 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
950 | struct xdp_mmap_offsets_v1 off_v1; |
951 | bool flags_supported = true; | |
952 | void *to_copy; | |
b3a9e0be | 953 | |
77cd0d7b | 954 | if (len < sizeof(off_v1)) |
b3a9e0be | 955 | return -EINVAL; |
77cd0d7b MK |
956 | else if (len < sizeof(off)) |
957 | flags_supported = false; | |
958 | ||
959 | if (flags_supported) { | |
960 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
961 | * except for the flags field added to the end. | |
962 | */ | |
963 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
964 | &off.rx); | |
965 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
966 | &off.tx); | |
967 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
968 | &off.fr); | |
969 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
970 | &off.cr); | |
971 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
972 | ptrs.flags); | |
973 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
974 | ptrs.flags); | |
975 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
976 | ptrs.flags); | |
977 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
978 | ptrs.flags); | |
979 | ||
980 | len = sizeof(off); | |
981 | to_copy = &off; | |
982 | } else { | |
983 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
984 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
985 | xsk_enter_umem_offsets(&off_v1.fr); | |
986 | xsk_enter_umem_offsets(&off_v1.cr); | |
987 | ||
988 | len = sizeof(off_v1); | |
989 | to_copy = &off_v1; | |
990 | } | |
b3a9e0be | 991 | |
77cd0d7b | 992 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
993 | return -EFAULT; |
994 | if (put_user(len, optlen)) | |
995 | return -EFAULT; | |
996 | ||
997 | return 0; | |
998 | } | |
2640d3c8 MM |
999 | case XDP_OPTIONS: |
1000 | { | |
1001 | struct xdp_options opts = {}; | |
1002 | ||
1003 | if (len < sizeof(opts)) | |
1004 | return -EINVAL; | |
1005 | ||
1006 | mutex_lock(&xs->mutex); | |
1007 | if (xs->zc) | |
1008 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1009 | mutex_unlock(&xs->mutex); | |
1010 | ||
1011 | len = sizeof(opts); | |
1012 | if (copy_to_user(optval, &opts, len)) | |
1013 | return -EFAULT; | |
1014 | if (put_user(len, optlen)) | |
1015 | return -EFAULT; | |
1016 | ||
1017 | return 0; | |
1018 | } | |
af75d9e0 MK |
1019 | default: |
1020 | break; | |
1021 | } | |
1022 | ||
1023 | return -EOPNOTSUPP; | |
1024 | } | |
1025 | ||
423f3832 MK |
1026 | static int xsk_mmap(struct file *file, struct socket *sock, |
1027 | struct vm_area_struct *vma) | |
1028 | { | |
a5a16e43 | 1029 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1030 | unsigned long size = vma->vm_end - vma->vm_start; |
1031 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
1032 | struct xsk_queue *q = NULL; | |
1033 | unsigned long pfn; | |
1034 | struct page *qpg; | |
1035 | ||
42fddcc7 | 1036 | if (READ_ONCE(xs->state) != XSK_READY) |
455302d1 IM |
1037 | return -EBUSY; |
1038 | ||
b9b6b68e | 1039 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1040 | q = READ_ONCE(xs->rx); |
f6145903 | 1041 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1042 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1043 | } else { |
e6762c8b MK |
1044 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1045 | smp_rmb(); | |
b9b6b68e | 1046 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
7361f9c3 | 1047 | q = READ_ONCE(xs->fq_tmp); |
fe230832 | 1048 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
7361f9c3 | 1049 | q = READ_ONCE(xs->cq_tmp); |
b9b6b68e | 1050 | } |
423f3832 MK |
1051 | |
1052 | if (!q) | |
1053 | return -EINVAL; | |
1054 | ||
e6762c8b MK |
1055 | /* Matches the smp_wmb() in xsk_init_queue */ |
1056 | smp_rmb(); | |
423f3832 | 1057 | qpg = virt_to_head_page(q->ring); |
a50b854e | 1058 | if (size > page_size(qpg)) |
423f3832 MK |
1059 | return -EINVAL; |
1060 | ||
1061 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
1062 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
1063 | size, vma->vm_page_prot); | |
1064 | } | |
1065 | ||
455302d1 IM |
1066 | static int xsk_notifier(struct notifier_block *this, |
1067 | unsigned long msg, void *ptr) | |
1068 | { | |
1069 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1070 | struct net *net = dev_net(dev); | |
1071 | struct sock *sk; | |
1072 | ||
1073 | switch (msg) { | |
1074 | case NETDEV_UNREGISTER: | |
1075 | mutex_lock(&net->xdp.lock); | |
1076 | sk_for_each(sk, &net->xdp.list) { | |
1077 | struct xdp_sock *xs = xdp_sk(sk); | |
1078 | ||
1079 | mutex_lock(&xs->mutex); | |
1080 | if (xs->dev == dev) { | |
1081 | sk->sk_err = ENETDOWN; | |
1082 | if (!sock_flag(sk, SOCK_DEAD)) | |
1083 | sk->sk_error_report(sk); | |
1084 | ||
1085 | xsk_unbind_dev(xs); | |
1086 | ||
1c1efc2a MK |
1087 | /* Clear device references. */ |
1088 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1089 | } |
1090 | mutex_unlock(&xs->mutex); | |
1091 | } | |
1092 | mutex_unlock(&net->xdp.lock); | |
1093 | break; | |
1094 | } | |
1095 | return NOTIFY_DONE; | |
1096 | } | |
1097 | ||
c0c77d8f BT |
1098 | static struct proto xsk_proto = { |
1099 | .name = "XDP", | |
1100 | .owner = THIS_MODULE, | |
1101 | .obj_size = sizeof(struct xdp_sock), | |
1102 | }; | |
1103 | ||
1104 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1105 | .family = PF_XDP, |
1106 | .owner = THIS_MODULE, | |
1107 | .release = xsk_release, | |
1108 | .bind = xsk_bind, | |
1109 | .connect = sock_no_connect, | |
1110 | .socketpair = sock_no_socketpair, | |
1111 | .accept = sock_no_accept, | |
1112 | .getname = sock_no_getname, | |
a11e1d43 | 1113 | .poll = xsk_poll, |
c2f4374b BT |
1114 | .ioctl = sock_no_ioctl, |
1115 | .listen = sock_no_listen, | |
1116 | .shutdown = sock_no_shutdown, | |
1117 | .setsockopt = xsk_setsockopt, | |
1118 | .getsockopt = xsk_getsockopt, | |
1119 | .sendmsg = xsk_sendmsg, | |
1120 | .recvmsg = sock_no_recvmsg, | |
1121 | .mmap = xsk_mmap, | |
1122 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1123 | }; |
1124 | ||
11fe9262 BT |
1125 | static void xsk_destruct(struct sock *sk) |
1126 | { | |
1127 | struct xdp_sock *xs = xdp_sk(sk); | |
1128 | ||
1129 | if (!sock_flag(sk, SOCK_DEAD)) | |
1130 | return; | |
1131 | ||
1c1efc2a | 1132 | xp_put_pool(xs->pool); |
11fe9262 BT |
1133 | |
1134 | sk_refcnt_debug_dec(sk); | |
1135 | } | |
1136 | ||
c0c77d8f BT |
1137 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1138 | int kern) | |
1139 | { | |
c0c77d8f | 1140 | struct xdp_sock *xs; |
1c1efc2a | 1141 | struct sock *sk; |
c0c77d8f BT |
1142 | |
1143 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1144 | return -EPERM; | |
1145 | if (sock->type != SOCK_RAW) | |
1146 | return -ESOCKTNOSUPPORT; | |
1147 | ||
1148 | if (protocol) | |
1149 | return -EPROTONOSUPPORT; | |
1150 | ||
1151 | sock->state = SS_UNCONNECTED; | |
1152 | ||
1153 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1154 | if (!sk) | |
1155 | return -ENOBUFS; | |
1156 | ||
1157 | sock->ops = &xsk_proto_ops; | |
1158 | ||
1159 | sock_init_data(sock, sk); | |
1160 | ||
1161 | sk->sk_family = PF_XDP; | |
1162 | ||
11fe9262 BT |
1163 | sk->sk_destruct = xsk_destruct; |
1164 | sk_refcnt_debug_inc(sk); | |
1165 | ||
cee27167 BT |
1166 | sock_set_flag(sk, SOCK_RCU_FREE); |
1167 | ||
c0c77d8f | 1168 | xs = xdp_sk(sk); |
455302d1 | 1169 | xs->state = XSK_READY; |
c0c77d8f | 1170 | mutex_init(&xs->mutex); |
bf0bdd13 | 1171 | spin_lock_init(&xs->rx_lock); |
a9744f7c | 1172 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f | 1173 | |
0402acd6 BT |
1174 | INIT_LIST_HEAD(&xs->map_list); |
1175 | spin_lock_init(&xs->map_list_lock); | |
1176 | ||
1d0dc069 BT |
1177 | mutex_lock(&net->xdp.lock); |
1178 | sk_add_node_rcu(sk, &net->xdp.list); | |
1179 | mutex_unlock(&net->xdp.lock); | |
1180 | ||
c0c77d8f BT |
1181 | local_bh_disable(); |
1182 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
1183 | local_bh_enable(); | |
1184 | ||
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | static const struct net_proto_family xsk_family_ops = { | |
1189 | .family = PF_XDP, | |
1190 | .create = xsk_create, | |
1191 | .owner = THIS_MODULE, | |
1192 | }; | |
1193 | ||
455302d1 IM |
1194 | static struct notifier_block xsk_netdev_notifier = { |
1195 | .notifier_call = xsk_notifier, | |
1196 | }; | |
1197 | ||
1d0dc069 BT |
1198 | static int __net_init xsk_net_init(struct net *net) |
1199 | { | |
1200 | mutex_init(&net->xdp.lock); | |
1201 | INIT_HLIST_HEAD(&net->xdp.list); | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static void __net_exit xsk_net_exit(struct net *net) | |
1206 | { | |
1207 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1208 | } | |
1209 | ||
1210 | static struct pernet_operations xsk_net_ops = { | |
1211 | .init = xsk_net_init, | |
1212 | .exit = xsk_net_exit, | |
1213 | }; | |
1214 | ||
c0c77d8f BT |
1215 | static int __init xsk_init(void) |
1216 | { | |
e312b9e7 | 1217 | int err, cpu; |
c0c77d8f BT |
1218 | |
1219 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1220 | if (err) | |
1221 | goto out; | |
1222 | ||
1223 | err = sock_register(&xsk_family_ops); | |
1224 | if (err) | |
1225 | goto out_proto; | |
1226 | ||
1d0dc069 BT |
1227 | err = register_pernet_subsys(&xsk_net_ops); |
1228 | if (err) | |
1229 | goto out_sk; | |
455302d1 IM |
1230 | |
1231 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1232 | if (err) | |
1233 | goto out_pernet; | |
1234 | ||
e312b9e7 BT |
1235 | for_each_possible_cpu(cpu) |
1236 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1237 | return 0; |
1238 | ||
455302d1 IM |
1239 | out_pernet: |
1240 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1241 | out_sk: |
1242 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1243 | out_proto: |
1244 | proto_unregister(&xsk_proto); | |
1245 | out: | |
1246 | return err; | |
1247 | } | |
1248 | ||
1249 | fs_initcall(xsk_init); |