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> |
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 | ||
642e450b MK |
414 | /* Hinder dev_direct_xmit from freeing the packet and |
415 | * therefore completing it in the destructor | |
416 | */ | |
417 | refcount_inc(&skb->users); | |
35fcde7f | 418 | err = dev_direct_xmit(skb, xs->queue_id); |
642e450b MK |
419 | if (err == NETDEV_TX_BUSY) { |
420 | /* Tell user-space to retry the send */ | |
421 | skb->destructor = sock_wfree; | |
422 | /* Free skb without triggering the perf drop trace */ | |
423 | consume_skb(skb); | |
424 | err = -EAGAIN; | |
425 | goto out; | |
426 | } | |
427 | ||
c5ed924b | 428 | xskq_cons_release(xs->tx); |
35fcde7f | 429 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
642e450b | 430 | if (err == NET_XMIT_DROP) { |
fe588685 | 431 | /* SKB completed but not sent */ |
642e450b | 432 | kfree_skb(skb); |
fe588685 | 433 | err = -EBUSY; |
35fcde7f MK |
434 | goto out; |
435 | } | |
436 | ||
642e450b | 437 | consume_skb(skb); |
35fcde7f | 438 | sent_frame = true; |
35fcde7f MK |
439 | } |
440 | ||
8aa5a335 CL |
441 | xs->tx->queue_empty_descs++; |
442 | ||
35fcde7f MK |
443 | out: |
444 | if (sent_frame) | |
445 | sk->sk_write_space(sk); | |
446 | ||
447 | mutex_unlock(&xs->mutex); | |
448 | return err; | |
449 | } | |
450 | ||
df551058 MK |
451 | static int __xsk_sendmsg(struct sock *sk) |
452 | { | |
453 | struct xdp_sock *xs = xdp_sk(sk); | |
454 | ||
455 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
456 | return -ENETDOWN; | |
457 | if (unlikely(!xs->tx)) | |
458 | return -ENOBUFS; | |
459 | ||
460 | return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk); | |
461 | } | |
462 | ||
35fcde7f MK |
463 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
464 | { | |
ac98d8aa | 465 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
466 | struct sock *sk = sock->sk; |
467 | struct xdp_sock *xs = xdp_sk(sk); | |
468 | ||
42fddcc7 | 469 | if (unlikely(!xsk_is_bound(xs))) |
35fcde7f | 470 | return -ENXIO; |
df551058 | 471 | if (unlikely(need_wait)) |
ac98d8aa | 472 | return -EOPNOTSUPP; |
35fcde7f | 473 | |
df551058 | 474 | return __xsk_sendmsg(sk); |
35fcde7f MK |
475 | } |
476 | ||
5d946c5a | 477 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 478 | struct poll_table_struct *wait) |
c497176c | 479 | { |
5d946c5a | 480 | __poll_t mask = datagram_poll(file, sock, wait); |
df551058 MK |
481 | struct sock *sk = sock->sk; |
482 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 483 | struct xsk_buff_pool *pool; |
42fddcc7 BT |
484 | |
485 | if (unlikely(!xsk_is_bound(xs))) | |
486 | return mask; | |
487 | ||
c2d3d6a4 | 488 | pool = xs->pool; |
77cd0d7b | 489 | |
c2d3d6a4 | 490 | if (pool->cached_need_wakeup) { |
06870682 | 491 | if (xs->zc) |
c2d3d6a4 | 492 | xsk_wakeup(xs, pool->cached_need_wakeup); |
df551058 MK |
493 | else |
494 | /* Poll needs to drive Tx also in copy mode */ | |
495 | __xsk_sendmsg(sk); | |
496 | } | |
c497176c | 497 | |
59e35e55 | 498 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 499 | mask |= EPOLLIN | EPOLLRDNORM; |
c5ed924b | 500 | if (xs->tx && !xskq_cons_is_full(xs->tx)) |
5d946c5a | 501 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c BT |
502 | |
503 | return mask; | |
504 | } | |
505 | ||
b9b6b68e BT |
506 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
507 | bool umem_queue) | |
423f3832 MK |
508 | { |
509 | struct xsk_queue *q; | |
510 | ||
511 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
512 | return -EINVAL; | |
513 | ||
b9b6b68e | 514 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
515 | if (!q) |
516 | return -ENOMEM; | |
517 | ||
37b07693 BT |
518 | /* Make sure queue is ready before it can be seen by others */ |
519 | smp_wmb(); | |
94a99763 | 520 | WRITE_ONCE(*queue, q); |
423f3832 MK |
521 | return 0; |
522 | } | |
523 | ||
455302d1 IM |
524 | static void xsk_unbind_dev(struct xdp_sock *xs) |
525 | { | |
526 | struct net_device *dev = xs->dev; | |
527 | ||
42fddcc7 | 528 | if (xs->state != XSK_BOUND) |
455302d1 | 529 | return; |
42fddcc7 | 530 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
531 | |
532 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 533 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
534 | xs->dev = NULL; |
535 | synchronize_net(); | |
536 | dev_put(dev); | |
537 | } | |
538 | ||
0402acd6 BT |
539 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
540 | struct xdp_sock ***map_entry) | |
541 | { | |
542 | struct xsk_map *map = NULL; | |
543 | struct xsk_map_node *node; | |
544 | ||
545 | *map_entry = NULL; | |
546 | ||
547 | spin_lock_bh(&xs->map_list_lock); | |
548 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
549 | node); | |
550 | if (node) { | |
551 | WARN_ON(xsk_map_inc(node->map)); | |
552 | map = node->map; | |
553 | *map_entry = node->map_entry; | |
554 | } | |
555 | spin_unlock_bh(&xs->map_list_lock); | |
556 | return map; | |
557 | } | |
558 | ||
559 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
560 | { | |
561 | /* This function removes the current XDP socket from all the | |
562 | * maps it resides in. We need to take extra care here, due to | |
563 | * the two locks involved. Each map has a lock synchronizing | |
564 | * updates to the entries, and each socket has a lock that | |
565 | * synchronizes access to the list of maps (map_list). For | |
566 | * deadlock avoidance the locks need to be taken in the order | |
567 | * "map lock"->"socket map list lock". We start off by | |
568 | * accessing the socket map list, and take a reference to the | |
569 | * map to guarantee existence between the | |
570 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
571 | * calls. Then we ask the map to remove the socket, which | |
572 | * tries to remove the socket from the map. Note that there | |
573 | * might be updates to the map between | |
574 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
575 | */ | |
576 | struct xdp_sock **map_entry = NULL; | |
577 | struct xsk_map *map; | |
578 | ||
579 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
580 | xsk_map_try_sock_delete(map, xs, map_entry); | |
581 | xsk_map_put(map); | |
582 | } | |
583 | } | |
584 | ||
c0c77d8f BT |
585 | static int xsk_release(struct socket *sock) |
586 | { | |
587 | struct sock *sk = sock->sk; | |
965a9909 | 588 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
589 | struct net *net; |
590 | ||
591 | if (!sk) | |
592 | return 0; | |
593 | ||
594 | net = sock_net(sk); | |
595 | ||
1d0dc069 BT |
596 | mutex_lock(&net->xdp.lock); |
597 | sk_del_node_init_rcu(sk); | |
598 | mutex_unlock(&net->xdp.lock); | |
599 | ||
c0c77d8f BT |
600 | local_bh_disable(); |
601 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
602 | local_bh_enable(); | |
603 | ||
0402acd6 | 604 | xsk_delete_from_maps(xs); |
42fddcc7 | 605 | mutex_lock(&xs->mutex); |
455302d1 | 606 | xsk_unbind_dev(xs); |
42fddcc7 | 607 | mutex_unlock(&xs->mutex); |
965a9909 | 608 | |
541d7fdd BT |
609 | xskq_destroy(xs->rx); |
610 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
611 | xskq_destroy(xs->fq_tmp); |
612 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 613 | |
c0c77d8f BT |
614 | sock_orphan(sk); |
615 | sock->sk = NULL; | |
616 | ||
617 | sk_refcnt_debug_release(sk); | |
618 | sock_put(sk); | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
965a9909 MK |
623 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
624 | { | |
625 | struct socket *sock; | |
626 | int err; | |
627 | ||
628 | sock = sockfd_lookup(fd, &err); | |
629 | if (!sock) | |
630 | return ERR_PTR(-ENOTSOCK); | |
631 | ||
632 | if (sock->sk->sk_family != PF_XDP) { | |
633 | sockfd_put(sock); | |
634 | return ERR_PTR(-ENOPROTOOPT); | |
635 | } | |
636 | ||
637 | return sock; | |
638 | } | |
639 | ||
7361f9c3 MK |
640 | static bool xsk_validate_queues(struct xdp_sock *xs) |
641 | { | |
642 | return xs->fq_tmp && xs->cq_tmp; | |
643 | } | |
644 | ||
965a9909 MK |
645 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
646 | { | |
647 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
648 | struct sock *sk = sock->sk; | |
965a9909 | 649 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 650 | struct net_device *dev; |
173d3adb | 651 | u32 flags, qid; |
965a9909 MK |
652 | int err = 0; |
653 | ||
654 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
655 | return -EINVAL; | |
656 | if (sxdp->sxdp_family != AF_XDP) | |
657 | return -EINVAL; | |
658 | ||
f54ba391 | 659 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
660 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
661 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
662 | return -EINVAL; |
663 | ||
5464c3a0 | 664 | rtnl_lock(); |
965a9909 | 665 | mutex_lock(&xs->mutex); |
455302d1 | 666 | if (xs->state != XSK_READY) { |
959b71db BT |
667 | err = -EBUSY; |
668 | goto out_release; | |
669 | } | |
670 | ||
965a9909 MK |
671 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
672 | if (!dev) { | |
673 | err = -ENODEV; | |
674 | goto out_release; | |
675 | } | |
676 | ||
f6145903 | 677 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
678 | err = -EINVAL; |
679 | goto out_unlock; | |
680 | } | |
681 | ||
173d3adb | 682 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
683 | |
684 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
685 | struct xdp_sock *umem_xs; |
686 | struct socket *sock; | |
687 | ||
77cd0d7b MK |
688 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
689 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
690 | /* Cannot specify flags for shared sockets. */ |
691 | err = -EINVAL; | |
692 | goto out_unlock; | |
693 | } | |
694 | ||
965a9909 MK |
695 | if (xs->umem) { |
696 | /* We have already our own. */ | |
697 | err = -EINVAL; | |
698 | goto out_unlock; | |
699 | } | |
700 | ||
701 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
702 | if (IS_ERR(sock)) { | |
703 | err = PTR_ERR(sock); | |
704 | goto out_unlock; | |
705 | } | |
706 | ||
707 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 708 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
709 | err = -EBADF; |
710 | sockfd_put(sock); | |
711 | goto out_unlock; | |
42fddcc7 | 712 | } |
965a9909 | 713 | |
a1132430 MK |
714 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
715 | /* Share the umem with another socket on another qid | |
716 | * and/or device. | |
717 | */ | |
b5aea28d MK |
718 | xs->pool = xp_create_and_assign_umem(xs, |
719 | umem_xs->umem); | |
720 | if (!xs->pool) { | |
1fd17c8c | 721 | err = -ENOMEM; |
b5aea28d MK |
722 | sockfd_put(sock); |
723 | goto out_unlock; | |
724 | } | |
725 | ||
726 | err = xp_assign_dev_shared(xs->pool, umem_xs->umem, | |
727 | dev, qid); | |
728 | if (err) { | |
729 | xp_destroy(xs->pool); | |
83cf5c68 | 730 | xs->pool = NULL; |
b5aea28d MK |
731 | sockfd_put(sock); |
732 | goto out_unlock; | |
733 | } | |
734 | } else { | |
735 | /* Share the buffer pool with the other socket. */ | |
736 | if (xs->fq_tmp || xs->cq_tmp) { | |
737 | /* Do not allow setting your own fq or cq. */ | |
738 | err = -EINVAL; | |
739 | sockfd_put(sock); | |
740 | goto out_unlock; | |
741 | } | |
742 | ||
743 | xp_get_pool(umem_xs->pool); | |
744 | xs->pool = umem_xs->pool; | |
745 | } | |
746 | ||
965a9909 | 747 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 748 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 749 | sockfd_put(sock); |
7361f9c3 | 750 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
751 | err = -EINVAL; |
752 | goto out_unlock; | |
c497176c BT |
753 | } else { |
754 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
755 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
756 | if (!xs->pool) { | |
757 | err = -ENOMEM; | |
173d3adb | 758 | goto out_unlock; |
1c1efc2a MK |
759 | } |
760 | ||
761 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
762 | if (err) { | |
763 | xp_destroy(xs->pool); | |
764 | xs->pool = NULL; | |
1c1efc2a MK |
765 | goto out_unlock; |
766 | } | |
965a9909 MK |
767 | } |
768 | ||
965a9909 | 769 | xs->dev = dev; |
ac98d8aa MK |
770 | xs->zc = xs->umem->zc; |
771 | xs->queue_id = qid; | |
a5aa8e52 | 772 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
773 | |
774 | out_unlock: | |
42fddcc7 | 775 | if (err) { |
965a9909 | 776 | dev_put(dev); |
42fddcc7 BT |
777 | } else { |
778 | /* Matches smp_rmb() in bind() for shared umem | |
779 | * sockets, and xsk_is_bound(). | |
780 | */ | |
781 | smp_wmb(); | |
782 | WRITE_ONCE(xs->state, XSK_BOUND); | |
783 | } | |
965a9909 MK |
784 | out_release: |
785 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 786 | rtnl_unlock(); |
965a9909 MK |
787 | return err; |
788 | } | |
789 | ||
c05cd364 KL |
790 | struct xdp_umem_reg_v1 { |
791 | __u64 addr; /* Start of packet data area */ | |
792 | __u64 len; /* Length of packet data area */ | |
793 | __u32 chunk_size; | |
794 | __u32 headroom; | |
795 | }; | |
796 | ||
c0c77d8f | 797 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 798 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
799 | { |
800 | struct sock *sk = sock->sk; | |
801 | struct xdp_sock *xs = xdp_sk(sk); | |
802 | int err; | |
803 | ||
804 | if (level != SOL_XDP) | |
805 | return -ENOPROTOOPT; | |
806 | ||
807 | switch (optname) { | |
b9b6b68e | 808 | case XDP_RX_RING: |
f6145903 | 809 | case XDP_TX_RING: |
b9b6b68e BT |
810 | { |
811 | struct xsk_queue **q; | |
812 | int entries; | |
813 | ||
814 | if (optlen < sizeof(entries)) | |
815 | return -EINVAL; | |
a7b75c5a | 816 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
817 | return -EFAULT; |
818 | ||
819 | mutex_lock(&xs->mutex); | |
455302d1 IM |
820 | if (xs->state != XSK_READY) { |
821 | mutex_unlock(&xs->mutex); | |
822 | return -EBUSY; | |
823 | } | |
f6145903 | 824 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 825 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
826 | if (!err && optname == XDP_TX_RING) |
827 | /* Tx needs to be explicitly woken up the first time */ | |
828 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
829 | mutex_unlock(&xs->mutex); |
830 | return err; | |
831 | } | |
c0c77d8f BT |
832 | case XDP_UMEM_REG: |
833 | { | |
c05cd364 KL |
834 | size_t mr_size = sizeof(struct xdp_umem_reg); |
835 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
836 | struct xdp_umem *umem; |
837 | ||
c05cd364 KL |
838 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
839 | return -EINVAL; | |
840 | else if (optlen < sizeof(mr)) | |
841 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
842 | ||
a7b75c5a | 843 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
844 | return -EFAULT; |
845 | ||
846 | mutex_lock(&xs->mutex); | |
455302d1 | 847 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
848 | mutex_unlock(&xs->mutex); |
849 | return -EBUSY; | |
850 | } | |
c0c77d8f | 851 | |
a49049ea BT |
852 | umem = xdp_umem_create(&mr); |
853 | if (IS_ERR(umem)) { | |
c0c77d8f | 854 | mutex_unlock(&xs->mutex); |
a49049ea | 855 | return PTR_ERR(umem); |
c0c77d8f BT |
856 | } |
857 | ||
858 | /* Make sure umem is ready before it can be seen by others */ | |
859 | smp_wmb(); | |
9764f4b3 | 860 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
861 | mutex_unlock(&xs->mutex); |
862 | return 0; | |
863 | } | |
423f3832 | 864 | case XDP_UMEM_FILL_RING: |
fe230832 | 865 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
866 | { |
867 | struct xsk_queue **q; | |
868 | int entries; | |
869 | ||
a7b75c5a | 870 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
871 | return -EFAULT; |
872 | ||
873 | mutex_lock(&xs->mutex); | |
455302d1 IM |
874 | if (xs->state != XSK_READY) { |
875 | mutex_unlock(&xs->mutex); | |
876 | return -EBUSY; | |
877 | } | |
a49049ea | 878 | |
7361f9c3 MK |
879 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
880 | &xs->cq_tmp; | |
b9b6b68e | 881 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
882 | mutex_unlock(&xs->mutex); |
883 | return err; | |
884 | } | |
c0c77d8f BT |
885 | default: |
886 | break; | |
887 | } | |
888 | ||
889 | return -ENOPROTOOPT; | |
890 | } | |
891 | ||
77cd0d7b MK |
892 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
893 | { | |
894 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
895 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
896 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
897 | } | |
898 | ||
899 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
900 | { | |
901 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
902 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
903 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
904 | } | |
905 | ||
8aa5a335 CL |
906 | struct xdp_statistics_v1 { |
907 | __u64 rx_dropped; | |
908 | __u64 rx_invalid_descs; | |
909 | __u64 tx_invalid_descs; | |
910 | }; | |
911 | ||
af75d9e0 MK |
912 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
913 | char __user *optval, int __user *optlen) | |
914 | { | |
915 | struct sock *sk = sock->sk; | |
916 | struct xdp_sock *xs = xdp_sk(sk); | |
917 | int len; | |
918 | ||
919 | if (level != SOL_XDP) | |
920 | return -ENOPROTOOPT; | |
921 | ||
922 | if (get_user(len, optlen)) | |
923 | return -EFAULT; | |
924 | if (len < 0) | |
925 | return -EINVAL; | |
926 | ||
927 | switch (optname) { | |
928 | case XDP_STATISTICS: | |
929 | { | |
3c4f850e | 930 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
931 | bool extra_stats = true; |
932 | size_t stats_size; | |
af75d9e0 | 933 | |
8aa5a335 | 934 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 935 | return -EINVAL; |
8aa5a335 CL |
936 | } else if (len < sizeof(stats)) { |
937 | extra_stats = false; | |
938 | stats_size = sizeof(struct xdp_statistics_v1); | |
939 | } else { | |
940 | stats_size = sizeof(stats); | |
941 | } | |
af75d9e0 MK |
942 | |
943 | mutex_lock(&xs->mutex); | |
944 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
945 | if (extra_stats) { |
946 | stats.rx_ring_full = xs->rx_queue_full; | |
947 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 948 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
949 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
950 | } else { | |
951 | stats.rx_dropped += xs->rx_queue_full; | |
952 | } | |
af75d9e0 MK |
953 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
954 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
955 | mutex_unlock(&xs->mutex); | |
956 | ||
8aa5a335 | 957 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 958 | return -EFAULT; |
8aa5a335 | 959 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
960 | return -EFAULT; |
961 | ||
962 | return 0; | |
963 | } | |
b3a9e0be BT |
964 | case XDP_MMAP_OFFSETS: |
965 | { | |
966 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
967 | struct xdp_mmap_offsets_v1 off_v1; |
968 | bool flags_supported = true; | |
969 | void *to_copy; | |
b3a9e0be | 970 | |
77cd0d7b | 971 | if (len < sizeof(off_v1)) |
b3a9e0be | 972 | return -EINVAL; |
77cd0d7b MK |
973 | else if (len < sizeof(off)) |
974 | flags_supported = false; | |
975 | ||
976 | if (flags_supported) { | |
977 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
978 | * except for the flags field added to the end. | |
979 | */ | |
980 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
981 | &off.rx); | |
982 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
983 | &off.tx); | |
984 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
985 | &off.fr); | |
986 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
987 | &off.cr); | |
988 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
989 | ptrs.flags); | |
990 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
991 | ptrs.flags); | |
992 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
993 | ptrs.flags); | |
994 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
995 | ptrs.flags); | |
996 | ||
997 | len = sizeof(off); | |
998 | to_copy = &off; | |
999 | } else { | |
1000 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
1001 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
1002 | xsk_enter_umem_offsets(&off_v1.fr); | |
1003 | xsk_enter_umem_offsets(&off_v1.cr); | |
1004 | ||
1005 | len = sizeof(off_v1); | |
1006 | to_copy = &off_v1; | |
1007 | } | |
b3a9e0be | 1008 | |
77cd0d7b | 1009 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
1010 | return -EFAULT; |
1011 | if (put_user(len, optlen)) | |
1012 | return -EFAULT; | |
1013 | ||
1014 | return 0; | |
1015 | } | |
2640d3c8 MM |
1016 | case XDP_OPTIONS: |
1017 | { | |
1018 | struct xdp_options opts = {}; | |
1019 | ||
1020 | if (len < sizeof(opts)) | |
1021 | return -EINVAL; | |
1022 | ||
1023 | mutex_lock(&xs->mutex); | |
1024 | if (xs->zc) | |
1025 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1026 | mutex_unlock(&xs->mutex); | |
1027 | ||
1028 | len = sizeof(opts); | |
1029 | if (copy_to_user(optval, &opts, len)) | |
1030 | return -EFAULT; | |
1031 | if (put_user(len, optlen)) | |
1032 | return -EFAULT; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
af75d9e0 MK |
1036 | default: |
1037 | break; | |
1038 | } | |
1039 | ||
1040 | return -EOPNOTSUPP; | |
1041 | } | |
1042 | ||
423f3832 MK |
1043 | static int xsk_mmap(struct file *file, struct socket *sock, |
1044 | struct vm_area_struct *vma) | |
1045 | { | |
a5a16e43 | 1046 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1047 | unsigned long size = vma->vm_end - vma->vm_start; |
1048 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
1049 | struct xsk_queue *q = NULL; | |
1050 | unsigned long pfn; | |
1051 | struct page *qpg; | |
1052 | ||
42fddcc7 | 1053 | if (READ_ONCE(xs->state) != XSK_READY) |
455302d1 IM |
1054 | return -EBUSY; |
1055 | ||
b9b6b68e | 1056 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1057 | q = READ_ONCE(xs->rx); |
f6145903 | 1058 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1059 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1060 | } else { |
e6762c8b MK |
1061 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1062 | smp_rmb(); | |
b9b6b68e | 1063 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
7361f9c3 | 1064 | q = READ_ONCE(xs->fq_tmp); |
fe230832 | 1065 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
7361f9c3 | 1066 | q = READ_ONCE(xs->cq_tmp); |
b9b6b68e | 1067 | } |
423f3832 MK |
1068 | |
1069 | if (!q) | |
1070 | return -EINVAL; | |
1071 | ||
e6762c8b MK |
1072 | /* Matches the smp_wmb() in xsk_init_queue */ |
1073 | smp_rmb(); | |
423f3832 | 1074 | qpg = virt_to_head_page(q->ring); |
a50b854e | 1075 | if (size > page_size(qpg)) |
423f3832 MK |
1076 | return -EINVAL; |
1077 | ||
1078 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
1079 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
1080 | size, vma->vm_page_prot); | |
1081 | } | |
1082 | ||
455302d1 IM |
1083 | static int xsk_notifier(struct notifier_block *this, |
1084 | unsigned long msg, void *ptr) | |
1085 | { | |
1086 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1087 | struct net *net = dev_net(dev); | |
1088 | struct sock *sk; | |
1089 | ||
1090 | switch (msg) { | |
1091 | case NETDEV_UNREGISTER: | |
1092 | mutex_lock(&net->xdp.lock); | |
1093 | sk_for_each(sk, &net->xdp.list) { | |
1094 | struct xdp_sock *xs = xdp_sk(sk); | |
1095 | ||
1096 | mutex_lock(&xs->mutex); | |
1097 | if (xs->dev == dev) { | |
1098 | sk->sk_err = ENETDOWN; | |
1099 | if (!sock_flag(sk, SOCK_DEAD)) | |
1100 | sk->sk_error_report(sk); | |
1101 | ||
1102 | xsk_unbind_dev(xs); | |
1103 | ||
1c1efc2a MK |
1104 | /* Clear device references. */ |
1105 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1106 | } |
1107 | mutex_unlock(&xs->mutex); | |
1108 | } | |
1109 | mutex_unlock(&net->xdp.lock); | |
1110 | break; | |
1111 | } | |
1112 | return NOTIFY_DONE; | |
1113 | } | |
1114 | ||
c0c77d8f BT |
1115 | static struct proto xsk_proto = { |
1116 | .name = "XDP", | |
1117 | .owner = THIS_MODULE, | |
1118 | .obj_size = sizeof(struct xdp_sock), | |
1119 | }; | |
1120 | ||
1121 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1122 | .family = PF_XDP, |
1123 | .owner = THIS_MODULE, | |
1124 | .release = xsk_release, | |
1125 | .bind = xsk_bind, | |
1126 | .connect = sock_no_connect, | |
1127 | .socketpair = sock_no_socketpair, | |
1128 | .accept = sock_no_accept, | |
1129 | .getname = sock_no_getname, | |
a11e1d43 | 1130 | .poll = xsk_poll, |
c2f4374b BT |
1131 | .ioctl = sock_no_ioctl, |
1132 | .listen = sock_no_listen, | |
1133 | .shutdown = sock_no_shutdown, | |
1134 | .setsockopt = xsk_setsockopt, | |
1135 | .getsockopt = xsk_getsockopt, | |
1136 | .sendmsg = xsk_sendmsg, | |
1137 | .recvmsg = sock_no_recvmsg, | |
1138 | .mmap = xsk_mmap, | |
1139 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1140 | }; |
1141 | ||
11fe9262 BT |
1142 | static void xsk_destruct(struct sock *sk) |
1143 | { | |
1144 | struct xdp_sock *xs = xdp_sk(sk); | |
1145 | ||
1146 | if (!sock_flag(sk, SOCK_DEAD)) | |
1147 | return; | |
1148 | ||
e5e1a4bc MK |
1149 | if (!xp_put_pool(xs->pool)) |
1150 | xdp_put_umem(xs->umem); | |
11fe9262 BT |
1151 | |
1152 | sk_refcnt_debug_dec(sk); | |
1153 | } | |
1154 | ||
c0c77d8f BT |
1155 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1156 | int kern) | |
1157 | { | |
c0c77d8f | 1158 | struct xdp_sock *xs; |
1c1efc2a | 1159 | struct sock *sk; |
c0c77d8f BT |
1160 | |
1161 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1162 | return -EPERM; | |
1163 | if (sock->type != SOCK_RAW) | |
1164 | return -ESOCKTNOSUPPORT; | |
1165 | ||
1166 | if (protocol) | |
1167 | return -EPROTONOSUPPORT; | |
1168 | ||
1169 | sock->state = SS_UNCONNECTED; | |
1170 | ||
1171 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1172 | if (!sk) | |
1173 | return -ENOBUFS; | |
1174 | ||
1175 | sock->ops = &xsk_proto_ops; | |
1176 | ||
1177 | sock_init_data(sock, sk); | |
1178 | ||
1179 | sk->sk_family = PF_XDP; | |
1180 | ||
11fe9262 BT |
1181 | sk->sk_destruct = xsk_destruct; |
1182 | sk_refcnt_debug_inc(sk); | |
1183 | ||
cee27167 BT |
1184 | sock_set_flag(sk, SOCK_RCU_FREE); |
1185 | ||
c0c77d8f | 1186 | xs = xdp_sk(sk); |
455302d1 | 1187 | xs->state = XSK_READY; |
c0c77d8f | 1188 | mutex_init(&xs->mutex); |
bf0bdd13 | 1189 | spin_lock_init(&xs->rx_lock); |
a9744f7c | 1190 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f | 1191 | |
0402acd6 BT |
1192 | INIT_LIST_HEAD(&xs->map_list); |
1193 | spin_lock_init(&xs->map_list_lock); | |
1194 | ||
1d0dc069 BT |
1195 | mutex_lock(&net->xdp.lock); |
1196 | sk_add_node_rcu(sk, &net->xdp.list); | |
1197 | mutex_unlock(&net->xdp.lock); | |
1198 | ||
c0c77d8f BT |
1199 | local_bh_disable(); |
1200 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
1201 | local_bh_enable(); | |
1202 | ||
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static const struct net_proto_family xsk_family_ops = { | |
1207 | .family = PF_XDP, | |
1208 | .create = xsk_create, | |
1209 | .owner = THIS_MODULE, | |
1210 | }; | |
1211 | ||
455302d1 IM |
1212 | static struct notifier_block xsk_netdev_notifier = { |
1213 | .notifier_call = xsk_notifier, | |
1214 | }; | |
1215 | ||
1d0dc069 BT |
1216 | static int __net_init xsk_net_init(struct net *net) |
1217 | { | |
1218 | mutex_init(&net->xdp.lock); | |
1219 | INIT_HLIST_HEAD(&net->xdp.list); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static void __net_exit xsk_net_exit(struct net *net) | |
1224 | { | |
1225 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1226 | } | |
1227 | ||
1228 | static struct pernet_operations xsk_net_ops = { | |
1229 | .init = xsk_net_init, | |
1230 | .exit = xsk_net_exit, | |
1231 | }; | |
1232 | ||
c0c77d8f BT |
1233 | static int __init xsk_init(void) |
1234 | { | |
e312b9e7 | 1235 | int err, cpu; |
c0c77d8f BT |
1236 | |
1237 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1238 | if (err) | |
1239 | goto out; | |
1240 | ||
1241 | err = sock_register(&xsk_family_ops); | |
1242 | if (err) | |
1243 | goto out_proto; | |
1244 | ||
1d0dc069 BT |
1245 | err = register_pernet_subsys(&xsk_net_ops); |
1246 | if (err) | |
1247 | goto out_sk; | |
455302d1 IM |
1248 | |
1249 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1250 | if (err) | |
1251 | goto out_pernet; | |
1252 | ||
e312b9e7 BT |
1253 | for_each_possible_cpu(cpu) |
1254 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1255 | return 0; |
1256 | ||
455302d1 IM |
1257 | out_pernet: |
1258 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1259 | out_sk: |
1260 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1261 | out_proto: |
1262 | proto_unregister(&xsk_proto); | |
1263 | out: | |
1264 | return err; | |
1265 | } | |
1266 | ||
1267 | fs_initcall(xsk_init); |