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> |
c0c77d8f | 25 | #include <net/xdp_sock.h> |
b9b6b68e | 26 | #include <net/xdp.h> |
c0c77d8f | 27 | |
423f3832 | 28 | #include "xsk_queue.h" |
c0c77d8f BT |
29 | #include "xdp_umem.h" |
30 | ||
35fcde7f MK |
31 | #define TX_BATCH_SIZE 16 |
32 | ||
c0c77d8f BT |
33 | static struct xdp_sock *xdp_sk(struct sock *sk) |
34 | { | |
35 | return (struct xdp_sock *)sk; | |
36 | } | |
37 | ||
fbfc504a BT |
38 | bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) |
39 | { | |
173d3adb BT |
40 | return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && |
41 | READ_ONCE(xs->umem->fq); | |
fbfc504a BT |
42 | } |
43 | ||
173d3adb BT |
44 | u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) |
45 | { | |
46 | return xskq_peek_addr(umem->fq, addr); | |
47 | } | |
48 | EXPORT_SYMBOL(xsk_umem_peek_addr); | |
49 | ||
50 | void xsk_umem_discard_addr(struct xdp_umem *umem) | |
51 | { | |
52 | xskq_discard_addr(umem->fq); | |
53 | } | |
54 | EXPORT_SYMBOL(xsk_umem_discard_addr); | |
55 | ||
56 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) | |
c497176c | 57 | { |
c497176c | 58 | void *buffer; |
bbff2f32 | 59 | u64 addr; |
4e64c835 | 60 | int err; |
c497176c | 61 | |
bbff2f32 BT |
62 | if (!xskq_peek_addr(xs->umem->fq, &addr) || |
63 | len > xs->umem->chunk_size_nohr) { | |
a509a955 | 64 | xs->rx_dropped++; |
c497176c | 65 | return -ENOSPC; |
a509a955 | 66 | } |
c497176c | 67 | |
bbff2f32 BT |
68 | addr += xs->umem->headroom; |
69 | ||
70 | buffer = xdp_umem_get_data(xs->umem, addr); | |
c497176c | 71 | memcpy(buffer, xdp->data, len); |
bbff2f32 | 72 | err = xskq_produce_batch_desc(xs->rx, addr, len); |
173d3adb | 73 | if (!err) { |
bbff2f32 | 74 | xskq_discard_addr(xs->umem->fq); |
173d3adb BT |
75 | xdp_return_buff(xdp); |
76 | return 0; | |
77 | } | |
c497176c | 78 | |
173d3adb | 79 | xs->rx_dropped++; |
c497176c BT |
80 | return err; |
81 | } | |
82 | ||
173d3adb | 83 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 84 | { |
173d3adb | 85 | int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); |
c497176c | 86 | |
2d55d614 | 87 | if (err) |
173d3adb | 88 | xs->rx_dropped++; |
c497176c BT |
89 | |
90 | return err; | |
91 | } | |
92 | ||
173d3adb BT |
93 | int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
94 | { | |
95 | u32 len; | |
96 | ||
97 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) | |
98 | return -EINVAL; | |
99 | ||
100 | len = xdp->data_end - xdp->data; | |
101 | ||
102 | return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? | |
103 | __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); | |
104 | } | |
105 | ||
c497176c BT |
106 | void xsk_flush(struct xdp_sock *xs) |
107 | { | |
108 | xskq_produce_flush_desc(xs->rx); | |
109 | xs->sk.sk_data_ready(&xs->sk); | |
110 | } | |
111 | ||
112 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
113 | { | |
173d3adb BT |
114 | u32 len = xdp->data_end - xdp->data; |
115 | void *buffer; | |
116 | u64 addr; | |
c497176c BT |
117 | int err; |
118 | ||
5d902372 BT |
119 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
120 | return -EINVAL; | |
121 | ||
173d3adb BT |
122 | if (!xskq_peek_addr(xs->umem->fq, &addr) || |
123 | len > xs->umem->chunk_size_nohr) { | |
124 | xs->rx_dropped++; | |
125 | return -ENOSPC; | |
126 | } | |
127 | ||
128 | addr += xs->umem->headroom; | |
129 | ||
130 | buffer = xdp_umem_get_data(xs->umem, addr); | |
131 | memcpy(buffer, xdp->data, len); | |
132 | err = xskq_produce_batch_desc(xs->rx, addr, len); | |
133 | if (!err) { | |
134 | xskq_discard_addr(xs->umem->fq); | |
c497176c | 135 | xsk_flush(xs); |
173d3adb BT |
136 | return 0; |
137 | } | |
c497176c | 138 | |
173d3adb | 139 | xs->rx_dropped++; |
c497176c BT |
140 | return err; |
141 | } | |
142 | ||
ac98d8aa MK |
143 | void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) |
144 | { | |
145 | xskq_produce_flush_addr_n(umem->cq, nb_entries); | |
146 | } | |
147 | EXPORT_SYMBOL(xsk_umem_complete_tx); | |
148 | ||
149 | void xsk_umem_consume_tx_done(struct xdp_umem *umem) | |
150 | { | |
151 | struct xdp_sock *xs; | |
152 | ||
153 | rcu_read_lock(); | |
154 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
155 | xs->sk.sk_write_space(&xs->sk); | |
156 | } | |
157 | rcu_read_unlock(); | |
158 | } | |
159 | EXPORT_SYMBOL(xsk_umem_consume_tx_done); | |
160 | ||
161 | bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) | |
162 | { | |
163 | struct xdp_desc desc; | |
164 | struct xdp_sock *xs; | |
165 | ||
166 | rcu_read_lock(); | |
167 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
168 | if (!xskq_peek_desc(xs->tx, &desc)) | |
169 | continue; | |
170 | ||
171 | if (xskq_produce_addr_lazy(umem->cq, desc.addr)) | |
172 | goto out; | |
173 | ||
174 | *dma = xdp_umem_get_dma(umem, desc.addr); | |
175 | *len = desc.len; | |
176 | ||
177 | xskq_discard_desc(xs->tx); | |
178 | rcu_read_unlock(); | |
179 | return true; | |
180 | } | |
181 | ||
182 | out: | |
183 | rcu_read_unlock(); | |
184 | return false; | |
185 | } | |
186 | EXPORT_SYMBOL(xsk_umem_consume_tx); | |
187 | ||
188 | static int xsk_zc_xmit(struct sock *sk) | |
189 | { | |
190 | struct xdp_sock *xs = xdp_sk(sk); | |
191 | struct net_device *dev = xs->dev; | |
192 | ||
193 | return dev->netdev_ops->ndo_xsk_async_xmit(dev, xs->queue_id); | |
194 | } | |
195 | ||
35fcde7f MK |
196 | static void xsk_destruct_skb(struct sk_buff *skb) |
197 | { | |
bbff2f32 | 198 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 199 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 200 | unsigned long flags; |
35fcde7f | 201 | |
a9744f7c | 202 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
bbff2f32 | 203 | WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); |
a9744f7c | 204 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
205 | |
206 | sock_wfree(skb); | |
207 | } | |
208 | ||
209 | static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, | |
210 | size_t total_len) | |
211 | { | |
35fcde7f MK |
212 | u32 max_batch = TX_BATCH_SIZE; |
213 | struct xdp_sock *xs = xdp_sk(sk); | |
214 | bool sent_frame = false; | |
215 | struct xdp_desc desc; | |
216 | struct sk_buff *skb; | |
217 | int err = 0; | |
218 | ||
35fcde7f MK |
219 | mutex_lock(&xs->mutex); |
220 | ||
221 | while (xskq_peek_desc(xs->tx, &desc)) { | |
222 | char *buffer; | |
bbff2f32 BT |
223 | u64 addr; |
224 | u32 len; | |
35fcde7f MK |
225 | |
226 | if (max_batch-- == 0) { | |
227 | err = -EAGAIN; | |
228 | goto out; | |
229 | } | |
230 | ||
9684f5e7 | 231 | if (xskq_reserve_addr(xs->umem->cq)) |
35fcde7f | 232 | goto out; |
35fcde7f | 233 | |
509d7648 | 234 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
2e59dd5e | 235 | goto out; |
2e59dd5e | 236 | |
09210c4b | 237 | len = desc.len; |
ac98d8aa | 238 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
35fcde7f MK |
239 | if (unlikely(!skb)) { |
240 | err = -EAGAIN; | |
241 | goto out; | |
242 | } | |
243 | ||
244 | skb_put(skb, len); | |
bbff2f32 BT |
245 | addr = desc.addr; |
246 | buffer = xdp_umem_get_data(xs->umem, addr); | |
35fcde7f MK |
247 | err = skb_store_bits(skb, 0, buffer, len); |
248 | if (unlikely(err)) { | |
249 | kfree_skb(skb); | |
250 | goto out; | |
251 | } | |
252 | ||
253 | skb->dev = xs->dev; | |
254 | skb->priority = sk->sk_priority; | |
255 | skb->mark = sk->sk_mark; | |
bbff2f32 | 256 | skb_shinfo(skb)->destructor_arg = (void *)(long)addr; |
35fcde7f MK |
257 | skb->destructor = xsk_destruct_skb; |
258 | ||
259 | err = dev_direct_xmit(skb, xs->queue_id); | |
fe588685 | 260 | xskq_discard_desc(xs->tx); |
35fcde7f MK |
261 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
262 | if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { | |
fe588685 MK |
263 | /* SKB completed but not sent */ |
264 | err = -EBUSY; | |
35fcde7f MK |
265 | goto out; |
266 | } | |
267 | ||
268 | sent_frame = true; | |
35fcde7f MK |
269 | } |
270 | ||
271 | out: | |
272 | if (sent_frame) | |
273 | sk->sk_write_space(sk); | |
274 | ||
275 | mutex_unlock(&xs->mutex); | |
276 | return err; | |
277 | } | |
278 | ||
279 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) | |
280 | { | |
ac98d8aa | 281 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
282 | struct sock *sk = sock->sk; |
283 | struct xdp_sock *xs = xdp_sk(sk); | |
284 | ||
285 | if (unlikely(!xs->dev)) | |
286 | return -ENXIO; | |
287 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
288 | return -ENETDOWN; | |
6efb4436 MK |
289 | if (unlikely(!xs->tx)) |
290 | return -ENOBUFS; | |
ac98d8aa MK |
291 | if (need_wait) |
292 | return -EOPNOTSUPP; | |
35fcde7f | 293 | |
ac98d8aa | 294 | return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); |
35fcde7f MK |
295 | } |
296 | ||
a11e1d43 LT |
297 | static unsigned int xsk_poll(struct file *file, struct socket *sock, |
298 | struct poll_table_struct *wait) | |
c497176c | 299 | { |
a11e1d43 | 300 | unsigned int mask = datagram_poll(file, sock, wait); |
c497176c BT |
301 | struct sock *sk = sock->sk; |
302 | struct xdp_sock *xs = xdp_sk(sk); | |
303 | ||
304 | if (xs->rx && !xskq_empty_desc(xs->rx)) | |
305 | mask |= POLLIN | POLLRDNORM; | |
35fcde7f MK |
306 | if (xs->tx && !xskq_full_desc(xs->tx)) |
307 | mask |= POLLOUT | POLLWRNORM; | |
c497176c BT |
308 | |
309 | return mask; | |
310 | } | |
311 | ||
b9b6b68e BT |
312 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
313 | bool umem_queue) | |
423f3832 MK |
314 | { |
315 | struct xsk_queue *q; | |
316 | ||
317 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
318 | return -EINVAL; | |
319 | ||
b9b6b68e | 320 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
321 | if (!q) |
322 | return -ENOMEM; | |
323 | ||
37b07693 BT |
324 | /* Make sure queue is ready before it can be seen by others */ |
325 | smp_wmb(); | |
423f3832 MK |
326 | *queue = q; |
327 | return 0; | |
328 | } | |
329 | ||
c0c77d8f BT |
330 | static int xsk_release(struct socket *sock) |
331 | { | |
332 | struct sock *sk = sock->sk; | |
965a9909 | 333 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
334 | struct net *net; |
335 | ||
336 | if (!sk) | |
337 | return 0; | |
338 | ||
339 | net = sock_net(sk); | |
340 | ||
341 | local_bh_disable(); | |
342 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
343 | local_bh_enable(); | |
344 | ||
965a9909 | 345 | if (xs->dev) { |
959b71db BT |
346 | /* Wait for driver to stop using the xdp socket. */ |
347 | synchronize_net(); | |
348 | dev_put(xs->dev); | |
965a9909 MK |
349 | xs->dev = NULL; |
350 | } | |
351 | ||
c0c77d8f BT |
352 | sock_orphan(sk); |
353 | sock->sk = NULL; | |
354 | ||
355 | sk_refcnt_debug_release(sk); | |
356 | sock_put(sk); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
965a9909 MK |
361 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
362 | { | |
363 | struct socket *sock; | |
364 | int err; | |
365 | ||
366 | sock = sockfd_lookup(fd, &err); | |
367 | if (!sock) | |
368 | return ERR_PTR(-ENOTSOCK); | |
369 | ||
370 | if (sock->sk->sk_family != PF_XDP) { | |
371 | sockfd_put(sock); | |
372 | return ERR_PTR(-ENOPROTOOPT); | |
373 | } | |
374 | ||
375 | return sock; | |
376 | } | |
377 | ||
378 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
379 | { | |
380 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
381 | struct sock *sk = sock->sk; | |
965a9909 | 382 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 383 | struct net_device *dev; |
173d3adb | 384 | u32 flags, qid; |
965a9909 MK |
385 | int err = 0; |
386 | ||
387 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
388 | return -EINVAL; | |
389 | if (sxdp->sxdp_family != AF_XDP) | |
390 | return -EINVAL; | |
391 | ||
392 | mutex_lock(&xs->mutex); | |
959b71db BT |
393 | if (xs->dev) { |
394 | err = -EBUSY; | |
395 | goto out_release; | |
396 | } | |
397 | ||
965a9909 MK |
398 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
399 | if (!dev) { | |
400 | err = -ENODEV; | |
401 | goto out_release; | |
402 | } | |
403 | ||
f6145903 | 404 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
405 | err = -EINVAL; |
406 | goto out_unlock; | |
407 | } | |
408 | ||
173d3adb BT |
409 | qid = sxdp->sxdp_queue_id; |
410 | ||
411 | if ((xs->rx && qid >= dev->real_num_rx_queues) || | |
412 | (xs->tx && qid >= dev->real_num_tx_queues)) { | |
965a9909 MK |
413 | err = -EINVAL; |
414 | goto out_unlock; | |
415 | } | |
416 | ||
173d3adb BT |
417 | flags = sxdp->sxdp_flags; |
418 | ||
419 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
420 | struct xdp_sock *umem_xs; |
421 | struct socket *sock; | |
422 | ||
173d3adb BT |
423 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { |
424 | /* Cannot specify flags for shared sockets. */ | |
425 | err = -EINVAL; | |
426 | goto out_unlock; | |
427 | } | |
428 | ||
965a9909 MK |
429 | if (xs->umem) { |
430 | /* We have already our own. */ | |
431 | err = -EINVAL; | |
432 | goto out_unlock; | |
433 | } | |
434 | ||
435 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
436 | if (IS_ERR(sock)) { | |
437 | err = PTR_ERR(sock); | |
438 | goto out_unlock; | |
439 | } | |
440 | ||
441 | umem_xs = xdp_sk(sock->sk); | |
442 | if (!umem_xs->umem) { | |
443 | /* No umem to inherit. */ | |
444 | err = -EBADF; | |
445 | sockfd_put(sock); | |
446 | goto out_unlock; | |
173d3adb | 447 | } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { |
965a9909 MK |
448 | err = -EINVAL; |
449 | sockfd_put(sock); | |
450 | goto out_unlock; | |
451 | } | |
452 | ||
453 | xdp_get_umem(umem_xs->umem); | |
965a9909 MK |
454 | xs->umem = umem_xs->umem; |
455 | sockfd_put(sock); | |
456 | } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { | |
457 | err = -EINVAL; | |
458 | goto out_unlock; | |
c497176c BT |
459 | } else { |
460 | /* This xsk has its own umem. */ | |
461 | xskq_set_umem(xs->umem->fq, &xs->umem->props); | |
fe230832 | 462 | xskq_set_umem(xs->umem->cq, &xs->umem->props); |
173d3adb BT |
463 | |
464 | err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); | |
465 | if (err) | |
466 | goto out_unlock; | |
965a9909 MK |
467 | } |
468 | ||
965a9909 | 469 | xs->dev = dev; |
ac98d8aa MK |
470 | xs->zc = xs->umem->zc; |
471 | xs->queue_id = qid; | |
965a9909 | 472 | xskq_set_umem(xs->rx, &xs->umem->props); |
35fcde7f | 473 | xskq_set_umem(xs->tx, &xs->umem->props); |
ac98d8aa | 474 | xdp_add_sk_umem(xs->umem, xs); |
965a9909 MK |
475 | |
476 | out_unlock: | |
477 | if (err) | |
478 | dev_put(dev); | |
479 | out_release: | |
480 | mutex_unlock(&xs->mutex); | |
481 | return err; | |
482 | } | |
483 | ||
c0c77d8f BT |
484 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
485 | char __user *optval, unsigned int optlen) | |
486 | { | |
487 | struct sock *sk = sock->sk; | |
488 | struct xdp_sock *xs = xdp_sk(sk); | |
489 | int err; | |
490 | ||
491 | if (level != SOL_XDP) | |
492 | return -ENOPROTOOPT; | |
493 | ||
494 | switch (optname) { | |
b9b6b68e | 495 | case XDP_RX_RING: |
f6145903 | 496 | case XDP_TX_RING: |
b9b6b68e BT |
497 | { |
498 | struct xsk_queue **q; | |
499 | int entries; | |
500 | ||
501 | if (optlen < sizeof(entries)) | |
502 | return -EINVAL; | |
503 | if (copy_from_user(&entries, optval, sizeof(entries))) | |
504 | return -EFAULT; | |
505 | ||
506 | mutex_lock(&xs->mutex); | |
f6145903 | 507 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e BT |
508 | err = xsk_init_queue(entries, q, false); |
509 | mutex_unlock(&xs->mutex); | |
510 | return err; | |
511 | } | |
c0c77d8f BT |
512 | case XDP_UMEM_REG: |
513 | { | |
514 | struct xdp_umem_reg mr; | |
515 | struct xdp_umem *umem; | |
516 | ||
c0c77d8f BT |
517 | if (copy_from_user(&mr, optval, sizeof(mr))) |
518 | return -EFAULT; | |
519 | ||
520 | mutex_lock(&xs->mutex); | |
a49049ea BT |
521 | if (xs->umem) { |
522 | mutex_unlock(&xs->mutex); | |
523 | return -EBUSY; | |
524 | } | |
c0c77d8f | 525 | |
a49049ea BT |
526 | umem = xdp_umem_create(&mr); |
527 | if (IS_ERR(umem)) { | |
c0c77d8f | 528 | mutex_unlock(&xs->mutex); |
a49049ea | 529 | return PTR_ERR(umem); |
c0c77d8f BT |
530 | } |
531 | ||
532 | /* Make sure umem is ready before it can be seen by others */ | |
533 | smp_wmb(); | |
c0c77d8f BT |
534 | xs->umem = umem; |
535 | mutex_unlock(&xs->mutex); | |
536 | return 0; | |
537 | } | |
423f3832 | 538 | case XDP_UMEM_FILL_RING: |
fe230832 | 539 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
540 | { |
541 | struct xsk_queue **q; | |
542 | int entries; | |
543 | ||
423f3832 MK |
544 | if (copy_from_user(&entries, optval, sizeof(entries))) |
545 | return -EFAULT; | |
546 | ||
547 | mutex_lock(&xs->mutex); | |
a49049ea BT |
548 | if (!xs->umem) { |
549 | mutex_unlock(&xs->mutex); | |
550 | return -EINVAL; | |
551 | } | |
552 | ||
fe230832 MK |
553 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : |
554 | &xs->umem->cq; | |
b9b6b68e | 555 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
556 | mutex_unlock(&xs->mutex); |
557 | return err; | |
558 | } | |
c0c77d8f BT |
559 | default: |
560 | break; | |
561 | } | |
562 | ||
563 | return -ENOPROTOOPT; | |
564 | } | |
565 | ||
af75d9e0 MK |
566 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
567 | char __user *optval, int __user *optlen) | |
568 | { | |
569 | struct sock *sk = sock->sk; | |
570 | struct xdp_sock *xs = xdp_sk(sk); | |
571 | int len; | |
572 | ||
573 | if (level != SOL_XDP) | |
574 | return -ENOPROTOOPT; | |
575 | ||
576 | if (get_user(len, optlen)) | |
577 | return -EFAULT; | |
578 | if (len < 0) | |
579 | return -EINVAL; | |
580 | ||
581 | switch (optname) { | |
582 | case XDP_STATISTICS: | |
583 | { | |
584 | struct xdp_statistics stats; | |
585 | ||
586 | if (len < sizeof(stats)) | |
587 | return -EINVAL; | |
588 | ||
589 | mutex_lock(&xs->mutex); | |
590 | stats.rx_dropped = xs->rx_dropped; | |
591 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); | |
592 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
593 | mutex_unlock(&xs->mutex); | |
594 | ||
595 | if (copy_to_user(optval, &stats, sizeof(stats))) | |
596 | return -EFAULT; | |
597 | if (put_user(sizeof(stats), optlen)) | |
598 | return -EFAULT; | |
599 | ||
600 | return 0; | |
601 | } | |
b3a9e0be BT |
602 | case XDP_MMAP_OFFSETS: |
603 | { | |
604 | struct xdp_mmap_offsets off; | |
605 | ||
606 | if (len < sizeof(off)) | |
607 | return -EINVAL; | |
608 | ||
609 | off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
610 | off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
611 | off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
612 | off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
613 | off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
614 | off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
615 | ||
616 | off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
617 | off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
618 | off.fr.desc = offsetof(struct xdp_umem_ring, desc); | |
619 | off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
620 | off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
621 | off.cr.desc = offsetof(struct xdp_umem_ring, desc); | |
622 | ||
623 | len = sizeof(off); | |
624 | if (copy_to_user(optval, &off, len)) | |
625 | return -EFAULT; | |
626 | if (put_user(len, optlen)) | |
627 | return -EFAULT; | |
628 | ||
629 | return 0; | |
630 | } | |
af75d9e0 MK |
631 | default: |
632 | break; | |
633 | } | |
634 | ||
635 | return -EOPNOTSUPP; | |
636 | } | |
637 | ||
423f3832 MK |
638 | static int xsk_mmap(struct file *file, struct socket *sock, |
639 | struct vm_area_struct *vma) | |
640 | { | |
a5a16e43 | 641 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
642 | unsigned long size = vma->vm_end - vma->vm_start; |
643 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
644 | struct xsk_queue *q = NULL; | |
37b07693 | 645 | struct xdp_umem *umem; |
423f3832 MK |
646 | unsigned long pfn; |
647 | struct page *qpg; | |
648 | ||
b9b6b68e | 649 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 650 | q = READ_ONCE(xs->rx); |
f6145903 | 651 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 652 | q = READ_ONCE(xs->tx); |
b9b6b68e | 653 | } else { |
37b07693 BT |
654 | umem = READ_ONCE(xs->umem); |
655 | if (!umem) | |
b9b6b68e | 656 | return -EINVAL; |
423f3832 | 657 | |
b9b6b68e | 658 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
37b07693 | 659 | q = READ_ONCE(umem->fq); |
fe230832 | 660 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
37b07693 | 661 | q = READ_ONCE(umem->cq); |
b9b6b68e | 662 | } |
423f3832 MK |
663 | |
664 | if (!q) | |
665 | return -EINVAL; | |
666 | ||
667 | qpg = virt_to_head_page(q->ring); | |
668 | if (size > (PAGE_SIZE << compound_order(qpg))) | |
669 | return -EINVAL; | |
670 | ||
671 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
672 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
673 | size, vma->vm_page_prot); | |
674 | } | |
675 | ||
c0c77d8f BT |
676 | static struct proto xsk_proto = { |
677 | .name = "XDP", | |
678 | .owner = THIS_MODULE, | |
679 | .obj_size = sizeof(struct xdp_sock), | |
680 | }; | |
681 | ||
682 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
683 | .family = PF_XDP, |
684 | .owner = THIS_MODULE, | |
685 | .release = xsk_release, | |
686 | .bind = xsk_bind, | |
687 | .connect = sock_no_connect, | |
688 | .socketpair = sock_no_socketpair, | |
689 | .accept = sock_no_accept, | |
690 | .getname = sock_no_getname, | |
a11e1d43 | 691 | .poll = xsk_poll, |
c2f4374b BT |
692 | .ioctl = sock_no_ioctl, |
693 | .listen = sock_no_listen, | |
694 | .shutdown = sock_no_shutdown, | |
695 | .setsockopt = xsk_setsockopt, | |
696 | .getsockopt = xsk_getsockopt, | |
697 | .sendmsg = xsk_sendmsg, | |
698 | .recvmsg = sock_no_recvmsg, | |
699 | .mmap = xsk_mmap, | |
700 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
701 | }; |
702 | ||
703 | static void xsk_destruct(struct sock *sk) | |
704 | { | |
705 | struct xdp_sock *xs = xdp_sk(sk); | |
706 | ||
707 | if (!sock_flag(sk, SOCK_DEAD)) | |
708 | return; | |
709 | ||
b9b6b68e | 710 | xskq_destroy(xs->rx); |
f6145903 | 711 | xskq_destroy(xs->tx); |
ac98d8aa | 712 | xdp_del_sk_umem(xs->umem, xs); |
c0c77d8f BT |
713 | xdp_put_umem(xs->umem); |
714 | ||
715 | sk_refcnt_debug_dec(sk); | |
716 | } | |
717 | ||
718 | static int xsk_create(struct net *net, struct socket *sock, int protocol, | |
719 | int kern) | |
720 | { | |
721 | struct sock *sk; | |
722 | struct xdp_sock *xs; | |
723 | ||
724 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
725 | return -EPERM; | |
726 | if (sock->type != SOCK_RAW) | |
727 | return -ESOCKTNOSUPPORT; | |
728 | ||
729 | if (protocol) | |
730 | return -EPROTONOSUPPORT; | |
731 | ||
732 | sock->state = SS_UNCONNECTED; | |
733 | ||
734 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
735 | if (!sk) | |
736 | return -ENOBUFS; | |
737 | ||
738 | sock->ops = &xsk_proto_ops; | |
739 | ||
740 | sock_init_data(sock, sk); | |
741 | ||
742 | sk->sk_family = PF_XDP; | |
743 | ||
744 | sk->sk_destruct = xsk_destruct; | |
745 | sk_refcnt_debug_inc(sk); | |
746 | ||
cee27167 BT |
747 | sock_set_flag(sk, SOCK_RCU_FREE); |
748 | ||
c0c77d8f BT |
749 | xs = xdp_sk(sk); |
750 | mutex_init(&xs->mutex); | |
a9744f7c | 751 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f BT |
752 | |
753 | local_bh_disable(); | |
754 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
755 | local_bh_enable(); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
760 | static const struct net_proto_family xsk_family_ops = { | |
761 | .family = PF_XDP, | |
762 | .create = xsk_create, | |
763 | .owner = THIS_MODULE, | |
764 | }; | |
765 | ||
766 | static int __init xsk_init(void) | |
767 | { | |
768 | int err; | |
769 | ||
770 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
771 | if (err) | |
772 | goto out; | |
773 | ||
774 | err = sock_register(&xsk_family_ops); | |
775 | if (err) | |
776 | goto out_proto; | |
777 | ||
778 | return 0; | |
779 | ||
780 | out_proto: | |
781 | proto_unregister(&xsk_proto); | |
782 | out: | |
783 | return err; | |
784 | } | |
785 | ||
786 | fs_initcall(xsk_init); |