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 | |
173d3adb | 87 | if (err) { |
c497176c | 88 | xdp_return_buff(xdp); |
173d3adb BT |
89 | xs->rx_dropped++; |
90 | } | |
c497176c BT |
91 | |
92 | return err; | |
93 | } | |
94 | ||
173d3adb BT |
95 | int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
96 | { | |
97 | u32 len; | |
98 | ||
99 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) | |
100 | return -EINVAL; | |
101 | ||
102 | len = xdp->data_end - xdp->data; | |
103 | ||
104 | return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? | |
105 | __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); | |
106 | } | |
107 | ||
c497176c BT |
108 | void xsk_flush(struct xdp_sock *xs) |
109 | { | |
110 | xskq_produce_flush_desc(xs->rx); | |
111 | xs->sk.sk_data_ready(&xs->sk); | |
112 | } | |
113 | ||
114 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
115 | { | |
173d3adb BT |
116 | u32 len = xdp->data_end - xdp->data; |
117 | void *buffer; | |
118 | u64 addr; | |
c497176c BT |
119 | int err; |
120 | ||
5d902372 BT |
121 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
122 | return -EINVAL; | |
123 | ||
173d3adb BT |
124 | if (!xskq_peek_addr(xs->umem->fq, &addr) || |
125 | len > xs->umem->chunk_size_nohr) { | |
126 | xs->rx_dropped++; | |
127 | return -ENOSPC; | |
128 | } | |
129 | ||
130 | addr += xs->umem->headroom; | |
131 | ||
132 | buffer = xdp_umem_get_data(xs->umem, addr); | |
133 | memcpy(buffer, xdp->data, len); | |
134 | err = xskq_produce_batch_desc(xs->rx, addr, len); | |
135 | if (!err) { | |
136 | xskq_discard_addr(xs->umem->fq); | |
c497176c | 137 | xsk_flush(xs); |
173d3adb BT |
138 | return 0; |
139 | } | |
c497176c | 140 | |
173d3adb | 141 | xs->rx_dropped++; |
c497176c BT |
142 | return err; |
143 | } | |
144 | ||
ac98d8aa MK |
145 | void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) |
146 | { | |
147 | xskq_produce_flush_addr_n(umem->cq, nb_entries); | |
148 | } | |
149 | EXPORT_SYMBOL(xsk_umem_complete_tx); | |
150 | ||
151 | void xsk_umem_consume_tx_done(struct xdp_umem *umem) | |
152 | { | |
153 | struct xdp_sock *xs; | |
154 | ||
155 | rcu_read_lock(); | |
156 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
157 | xs->sk.sk_write_space(&xs->sk); | |
158 | } | |
159 | rcu_read_unlock(); | |
160 | } | |
161 | EXPORT_SYMBOL(xsk_umem_consume_tx_done); | |
162 | ||
163 | bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) | |
164 | { | |
165 | struct xdp_desc desc; | |
166 | struct xdp_sock *xs; | |
167 | ||
168 | rcu_read_lock(); | |
169 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
170 | if (!xskq_peek_desc(xs->tx, &desc)) | |
171 | continue; | |
172 | ||
173 | if (xskq_produce_addr_lazy(umem->cq, desc.addr)) | |
174 | goto out; | |
175 | ||
176 | *dma = xdp_umem_get_dma(umem, desc.addr); | |
177 | *len = desc.len; | |
178 | ||
179 | xskq_discard_desc(xs->tx); | |
180 | rcu_read_unlock(); | |
181 | return true; | |
182 | } | |
183 | ||
184 | out: | |
185 | rcu_read_unlock(); | |
186 | return false; | |
187 | } | |
188 | EXPORT_SYMBOL(xsk_umem_consume_tx); | |
189 | ||
190 | static int xsk_zc_xmit(struct sock *sk) | |
191 | { | |
192 | struct xdp_sock *xs = xdp_sk(sk); | |
193 | struct net_device *dev = xs->dev; | |
194 | ||
195 | return dev->netdev_ops->ndo_xsk_async_xmit(dev, xs->queue_id); | |
196 | } | |
197 | ||
35fcde7f MK |
198 | static void xsk_destruct_skb(struct sk_buff *skb) |
199 | { | |
bbff2f32 | 200 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 201 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 202 | unsigned long flags; |
35fcde7f | 203 | |
a9744f7c | 204 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
bbff2f32 | 205 | WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); |
a9744f7c | 206 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
207 | |
208 | sock_wfree(skb); | |
209 | } | |
210 | ||
211 | static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, | |
212 | size_t total_len) | |
213 | { | |
35fcde7f MK |
214 | u32 max_batch = TX_BATCH_SIZE; |
215 | struct xdp_sock *xs = xdp_sk(sk); | |
216 | bool sent_frame = false; | |
217 | struct xdp_desc desc; | |
218 | struct sk_buff *skb; | |
219 | int err = 0; | |
220 | ||
221 | if (unlikely(!xs->tx)) | |
222 | return -ENOBUFS; | |
35fcde7f MK |
223 | |
224 | mutex_lock(&xs->mutex); | |
225 | ||
226 | while (xskq_peek_desc(xs->tx, &desc)) { | |
227 | char *buffer; | |
bbff2f32 BT |
228 | u64 addr; |
229 | u32 len; | |
35fcde7f MK |
230 | |
231 | if (max_batch-- == 0) { | |
232 | err = -EAGAIN; | |
233 | goto out; | |
234 | } | |
235 | ||
bbff2f32 | 236 | if (xskq_reserve_addr(xs->umem->cq)) { |
35fcde7f MK |
237 | err = -EAGAIN; |
238 | goto out; | |
239 | } | |
240 | ||
241 | len = desc.len; | |
242 | if (unlikely(len > xs->dev->mtu)) { | |
243 | err = -EMSGSIZE; | |
244 | goto out; | |
245 | } | |
246 | ||
2e59dd5e MK |
247 | if (xs->queue_id >= xs->dev->real_num_tx_queues) { |
248 | err = -ENXIO; | |
249 | goto out; | |
250 | } | |
251 | ||
ac98d8aa | 252 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
35fcde7f MK |
253 | if (unlikely(!skb)) { |
254 | err = -EAGAIN; | |
255 | goto out; | |
256 | } | |
257 | ||
258 | skb_put(skb, len); | |
bbff2f32 BT |
259 | addr = desc.addr; |
260 | buffer = xdp_umem_get_data(xs->umem, addr); | |
35fcde7f MK |
261 | err = skb_store_bits(skb, 0, buffer, len); |
262 | if (unlikely(err)) { | |
263 | kfree_skb(skb); | |
264 | goto out; | |
265 | } | |
266 | ||
267 | skb->dev = xs->dev; | |
268 | skb->priority = sk->sk_priority; | |
269 | skb->mark = sk->sk_mark; | |
bbff2f32 | 270 | skb_shinfo(skb)->destructor_arg = (void *)(long)addr; |
35fcde7f MK |
271 | skb->destructor = xsk_destruct_skb; |
272 | ||
273 | err = dev_direct_xmit(skb, xs->queue_id); | |
fe588685 | 274 | xskq_discard_desc(xs->tx); |
35fcde7f MK |
275 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
276 | if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { | |
fe588685 MK |
277 | /* SKB completed but not sent */ |
278 | err = -EBUSY; | |
35fcde7f MK |
279 | goto out; |
280 | } | |
281 | ||
282 | sent_frame = true; | |
35fcde7f MK |
283 | } |
284 | ||
285 | out: | |
286 | if (sent_frame) | |
287 | sk->sk_write_space(sk); | |
288 | ||
289 | mutex_unlock(&xs->mutex); | |
290 | return err; | |
291 | } | |
292 | ||
293 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) | |
294 | { | |
ac98d8aa | 295 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
296 | struct sock *sk = sock->sk; |
297 | struct xdp_sock *xs = xdp_sk(sk); | |
298 | ||
299 | if (unlikely(!xs->dev)) | |
300 | return -ENXIO; | |
301 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
302 | return -ENETDOWN; | |
ac98d8aa MK |
303 | if (need_wait) |
304 | return -EOPNOTSUPP; | |
35fcde7f | 305 | |
ac98d8aa | 306 | return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); |
35fcde7f MK |
307 | } |
308 | ||
a11e1d43 LT |
309 | static unsigned int xsk_poll(struct file *file, struct socket *sock, |
310 | struct poll_table_struct *wait) | |
c497176c | 311 | { |
a11e1d43 | 312 | unsigned int mask = datagram_poll(file, sock, wait); |
c497176c BT |
313 | struct sock *sk = sock->sk; |
314 | struct xdp_sock *xs = xdp_sk(sk); | |
315 | ||
316 | if (xs->rx && !xskq_empty_desc(xs->rx)) | |
317 | mask |= POLLIN | POLLRDNORM; | |
35fcde7f MK |
318 | if (xs->tx && !xskq_full_desc(xs->tx)) |
319 | mask |= POLLOUT | POLLWRNORM; | |
c497176c BT |
320 | |
321 | return mask; | |
322 | } | |
323 | ||
b9b6b68e BT |
324 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
325 | bool umem_queue) | |
423f3832 MK |
326 | { |
327 | struct xsk_queue *q; | |
328 | ||
329 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
330 | return -EINVAL; | |
331 | ||
b9b6b68e | 332 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
333 | if (!q) |
334 | return -ENOMEM; | |
335 | ||
37b07693 BT |
336 | /* Make sure queue is ready before it can be seen by others */ |
337 | smp_wmb(); | |
423f3832 MK |
338 | *queue = q; |
339 | return 0; | |
340 | } | |
341 | ||
c0c77d8f BT |
342 | static int xsk_release(struct socket *sock) |
343 | { | |
344 | struct sock *sk = sock->sk; | |
965a9909 | 345 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
346 | struct net *net; |
347 | ||
348 | if (!sk) | |
349 | return 0; | |
350 | ||
351 | net = sock_net(sk); | |
352 | ||
353 | local_bh_disable(); | |
354 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
355 | local_bh_enable(); | |
356 | ||
965a9909 | 357 | if (xs->dev) { |
959b71db BT |
358 | /* Wait for driver to stop using the xdp socket. */ |
359 | synchronize_net(); | |
360 | dev_put(xs->dev); | |
965a9909 MK |
361 | xs->dev = NULL; |
362 | } | |
363 | ||
c0c77d8f BT |
364 | sock_orphan(sk); |
365 | sock->sk = NULL; | |
366 | ||
367 | sk_refcnt_debug_release(sk); | |
368 | sock_put(sk); | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
965a9909 MK |
373 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
374 | { | |
375 | struct socket *sock; | |
376 | int err; | |
377 | ||
378 | sock = sockfd_lookup(fd, &err); | |
379 | if (!sock) | |
380 | return ERR_PTR(-ENOTSOCK); | |
381 | ||
382 | if (sock->sk->sk_family != PF_XDP) { | |
383 | sockfd_put(sock); | |
384 | return ERR_PTR(-ENOPROTOOPT); | |
385 | } | |
386 | ||
387 | return sock; | |
388 | } | |
389 | ||
390 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
391 | { | |
392 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
393 | struct sock *sk = sock->sk; | |
965a9909 | 394 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 395 | struct net_device *dev; |
173d3adb | 396 | u32 flags, qid; |
965a9909 MK |
397 | int err = 0; |
398 | ||
399 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
400 | return -EINVAL; | |
401 | if (sxdp->sxdp_family != AF_XDP) | |
402 | return -EINVAL; | |
403 | ||
404 | mutex_lock(&xs->mutex); | |
959b71db BT |
405 | if (xs->dev) { |
406 | err = -EBUSY; | |
407 | goto out_release; | |
408 | } | |
409 | ||
965a9909 MK |
410 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
411 | if (!dev) { | |
412 | err = -ENODEV; | |
413 | goto out_release; | |
414 | } | |
415 | ||
f6145903 | 416 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
417 | err = -EINVAL; |
418 | goto out_unlock; | |
419 | } | |
420 | ||
173d3adb BT |
421 | qid = sxdp->sxdp_queue_id; |
422 | ||
423 | if ((xs->rx && qid >= dev->real_num_rx_queues) || | |
424 | (xs->tx && qid >= dev->real_num_tx_queues)) { | |
965a9909 MK |
425 | err = -EINVAL; |
426 | goto out_unlock; | |
427 | } | |
428 | ||
173d3adb BT |
429 | flags = sxdp->sxdp_flags; |
430 | ||
431 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
432 | struct xdp_sock *umem_xs; |
433 | struct socket *sock; | |
434 | ||
173d3adb BT |
435 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { |
436 | /* Cannot specify flags for shared sockets. */ | |
437 | err = -EINVAL; | |
438 | goto out_unlock; | |
439 | } | |
440 | ||
965a9909 MK |
441 | if (xs->umem) { |
442 | /* We have already our own. */ | |
443 | err = -EINVAL; | |
444 | goto out_unlock; | |
445 | } | |
446 | ||
447 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
448 | if (IS_ERR(sock)) { | |
449 | err = PTR_ERR(sock); | |
450 | goto out_unlock; | |
451 | } | |
452 | ||
453 | umem_xs = xdp_sk(sock->sk); | |
454 | if (!umem_xs->umem) { | |
455 | /* No umem to inherit. */ | |
456 | err = -EBADF; | |
457 | sockfd_put(sock); | |
458 | goto out_unlock; | |
173d3adb | 459 | } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { |
965a9909 MK |
460 | err = -EINVAL; |
461 | sockfd_put(sock); | |
462 | goto out_unlock; | |
463 | } | |
464 | ||
465 | xdp_get_umem(umem_xs->umem); | |
965a9909 MK |
466 | xs->umem = umem_xs->umem; |
467 | sockfd_put(sock); | |
468 | } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { | |
469 | err = -EINVAL; | |
470 | goto out_unlock; | |
c497176c BT |
471 | } else { |
472 | /* This xsk has its own umem. */ | |
473 | xskq_set_umem(xs->umem->fq, &xs->umem->props); | |
fe230832 | 474 | xskq_set_umem(xs->umem->cq, &xs->umem->props); |
173d3adb BT |
475 | |
476 | err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); | |
477 | if (err) | |
478 | goto out_unlock; | |
965a9909 MK |
479 | } |
480 | ||
965a9909 | 481 | xs->dev = dev; |
ac98d8aa MK |
482 | xs->zc = xs->umem->zc; |
483 | xs->queue_id = qid; | |
965a9909 | 484 | xskq_set_umem(xs->rx, &xs->umem->props); |
35fcde7f | 485 | xskq_set_umem(xs->tx, &xs->umem->props); |
ac98d8aa | 486 | xdp_add_sk_umem(xs->umem, xs); |
965a9909 MK |
487 | |
488 | out_unlock: | |
489 | if (err) | |
490 | dev_put(dev); | |
491 | out_release: | |
492 | mutex_unlock(&xs->mutex); | |
493 | return err; | |
494 | } | |
495 | ||
c0c77d8f BT |
496 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
497 | char __user *optval, unsigned int optlen) | |
498 | { | |
499 | struct sock *sk = sock->sk; | |
500 | struct xdp_sock *xs = xdp_sk(sk); | |
501 | int err; | |
502 | ||
503 | if (level != SOL_XDP) | |
504 | return -ENOPROTOOPT; | |
505 | ||
506 | switch (optname) { | |
b9b6b68e | 507 | case XDP_RX_RING: |
f6145903 | 508 | case XDP_TX_RING: |
b9b6b68e BT |
509 | { |
510 | struct xsk_queue **q; | |
511 | int entries; | |
512 | ||
513 | if (optlen < sizeof(entries)) | |
514 | return -EINVAL; | |
515 | if (copy_from_user(&entries, optval, sizeof(entries))) | |
516 | return -EFAULT; | |
517 | ||
518 | mutex_lock(&xs->mutex); | |
f6145903 | 519 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e BT |
520 | err = xsk_init_queue(entries, q, false); |
521 | mutex_unlock(&xs->mutex); | |
522 | return err; | |
523 | } | |
c0c77d8f BT |
524 | case XDP_UMEM_REG: |
525 | { | |
526 | struct xdp_umem_reg mr; | |
527 | struct xdp_umem *umem; | |
528 | ||
c0c77d8f BT |
529 | if (copy_from_user(&mr, optval, sizeof(mr))) |
530 | return -EFAULT; | |
531 | ||
532 | mutex_lock(&xs->mutex); | |
a49049ea BT |
533 | if (xs->umem) { |
534 | mutex_unlock(&xs->mutex); | |
535 | return -EBUSY; | |
536 | } | |
c0c77d8f | 537 | |
a49049ea BT |
538 | umem = xdp_umem_create(&mr); |
539 | if (IS_ERR(umem)) { | |
c0c77d8f | 540 | mutex_unlock(&xs->mutex); |
a49049ea | 541 | return PTR_ERR(umem); |
c0c77d8f BT |
542 | } |
543 | ||
544 | /* Make sure umem is ready before it can be seen by others */ | |
545 | smp_wmb(); | |
c0c77d8f BT |
546 | xs->umem = umem; |
547 | mutex_unlock(&xs->mutex); | |
548 | return 0; | |
549 | } | |
423f3832 | 550 | case XDP_UMEM_FILL_RING: |
fe230832 | 551 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
552 | { |
553 | struct xsk_queue **q; | |
554 | int entries; | |
555 | ||
423f3832 MK |
556 | if (copy_from_user(&entries, optval, sizeof(entries))) |
557 | return -EFAULT; | |
558 | ||
559 | mutex_lock(&xs->mutex); | |
a49049ea BT |
560 | if (!xs->umem) { |
561 | mutex_unlock(&xs->mutex); | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
fe230832 MK |
565 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : |
566 | &xs->umem->cq; | |
b9b6b68e | 567 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
568 | mutex_unlock(&xs->mutex); |
569 | return err; | |
570 | } | |
c0c77d8f BT |
571 | default: |
572 | break; | |
573 | } | |
574 | ||
575 | return -ENOPROTOOPT; | |
576 | } | |
577 | ||
af75d9e0 MK |
578 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
579 | char __user *optval, int __user *optlen) | |
580 | { | |
581 | struct sock *sk = sock->sk; | |
582 | struct xdp_sock *xs = xdp_sk(sk); | |
583 | int len; | |
584 | ||
585 | if (level != SOL_XDP) | |
586 | return -ENOPROTOOPT; | |
587 | ||
588 | if (get_user(len, optlen)) | |
589 | return -EFAULT; | |
590 | if (len < 0) | |
591 | return -EINVAL; | |
592 | ||
593 | switch (optname) { | |
594 | case XDP_STATISTICS: | |
595 | { | |
596 | struct xdp_statistics stats; | |
597 | ||
598 | if (len < sizeof(stats)) | |
599 | return -EINVAL; | |
600 | ||
601 | mutex_lock(&xs->mutex); | |
602 | stats.rx_dropped = xs->rx_dropped; | |
603 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); | |
604 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
605 | mutex_unlock(&xs->mutex); | |
606 | ||
607 | if (copy_to_user(optval, &stats, sizeof(stats))) | |
608 | return -EFAULT; | |
609 | if (put_user(sizeof(stats), optlen)) | |
610 | return -EFAULT; | |
611 | ||
612 | return 0; | |
613 | } | |
b3a9e0be BT |
614 | case XDP_MMAP_OFFSETS: |
615 | { | |
616 | struct xdp_mmap_offsets off; | |
617 | ||
618 | if (len < sizeof(off)) | |
619 | return -EINVAL; | |
620 | ||
621 | off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
622 | off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
623 | off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
624 | off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
625 | off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
626 | off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
627 | ||
628 | off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
629 | off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
630 | off.fr.desc = offsetof(struct xdp_umem_ring, desc); | |
631 | off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
632 | off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
633 | off.cr.desc = offsetof(struct xdp_umem_ring, desc); | |
634 | ||
635 | len = sizeof(off); | |
636 | if (copy_to_user(optval, &off, len)) | |
637 | return -EFAULT; | |
638 | if (put_user(len, optlen)) | |
639 | return -EFAULT; | |
640 | ||
641 | return 0; | |
642 | } | |
af75d9e0 MK |
643 | default: |
644 | break; | |
645 | } | |
646 | ||
647 | return -EOPNOTSUPP; | |
648 | } | |
649 | ||
423f3832 MK |
650 | static int xsk_mmap(struct file *file, struct socket *sock, |
651 | struct vm_area_struct *vma) | |
652 | { | |
a5a16e43 | 653 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
654 | unsigned long size = vma->vm_end - vma->vm_start; |
655 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
656 | struct xsk_queue *q = NULL; | |
37b07693 | 657 | struct xdp_umem *umem; |
423f3832 MK |
658 | unsigned long pfn; |
659 | struct page *qpg; | |
660 | ||
b9b6b68e | 661 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 662 | q = READ_ONCE(xs->rx); |
f6145903 | 663 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 664 | q = READ_ONCE(xs->tx); |
b9b6b68e | 665 | } else { |
37b07693 BT |
666 | umem = READ_ONCE(xs->umem); |
667 | if (!umem) | |
b9b6b68e | 668 | return -EINVAL; |
423f3832 | 669 | |
b9b6b68e | 670 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
37b07693 | 671 | q = READ_ONCE(umem->fq); |
fe230832 | 672 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
37b07693 | 673 | q = READ_ONCE(umem->cq); |
b9b6b68e | 674 | } |
423f3832 MK |
675 | |
676 | if (!q) | |
677 | return -EINVAL; | |
678 | ||
679 | qpg = virt_to_head_page(q->ring); | |
680 | if (size > (PAGE_SIZE << compound_order(qpg))) | |
681 | return -EINVAL; | |
682 | ||
683 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
684 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
685 | size, vma->vm_page_prot); | |
686 | } | |
687 | ||
c0c77d8f BT |
688 | static struct proto xsk_proto = { |
689 | .name = "XDP", | |
690 | .owner = THIS_MODULE, | |
691 | .obj_size = sizeof(struct xdp_sock), | |
692 | }; | |
693 | ||
694 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
695 | .family = PF_XDP, |
696 | .owner = THIS_MODULE, | |
697 | .release = xsk_release, | |
698 | .bind = xsk_bind, | |
699 | .connect = sock_no_connect, | |
700 | .socketpair = sock_no_socketpair, | |
701 | .accept = sock_no_accept, | |
702 | .getname = sock_no_getname, | |
a11e1d43 | 703 | .poll = xsk_poll, |
c2f4374b BT |
704 | .ioctl = sock_no_ioctl, |
705 | .listen = sock_no_listen, | |
706 | .shutdown = sock_no_shutdown, | |
707 | .setsockopt = xsk_setsockopt, | |
708 | .getsockopt = xsk_getsockopt, | |
709 | .sendmsg = xsk_sendmsg, | |
710 | .recvmsg = sock_no_recvmsg, | |
711 | .mmap = xsk_mmap, | |
712 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
713 | }; |
714 | ||
715 | static void xsk_destruct(struct sock *sk) | |
716 | { | |
717 | struct xdp_sock *xs = xdp_sk(sk); | |
718 | ||
719 | if (!sock_flag(sk, SOCK_DEAD)) | |
720 | return; | |
721 | ||
b9b6b68e | 722 | xskq_destroy(xs->rx); |
f6145903 | 723 | xskq_destroy(xs->tx); |
ac98d8aa | 724 | xdp_del_sk_umem(xs->umem, xs); |
c0c77d8f BT |
725 | xdp_put_umem(xs->umem); |
726 | ||
727 | sk_refcnt_debug_dec(sk); | |
728 | } | |
729 | ||
730 | static int xsk_create(struct net *net, struct socket *sock, int protocol, | |
731 | int kern) | |
732 | { | |
733 | struct sock *sk; | |
734 | struct xdp_sock *xs; | |
735 | ||
736 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
737 | return -EPERM; | |
738 | if (sock->type != SOCK_RAW) | |
739 | return -ESOCKTNOSUPPORT; | |
740 | ||
741 | if (protocol) | |
742 | return -EPROTONOSUPPORT; | |
743 | ||
744 | sock->state = SS_UNCONNECTED; | |
745 | ||
746 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
747 | if (!sk) | |
748 | return -ENOBUFS; | |
749 | ||
750 | sock->ops = &xsk_proto_ops; | |
751 | ||
752 | sock_init_data(sock, sk); | |
753 | ||
754 | sk->sk_family = PF_XDP; | |
755 | ||
756 | sk->sk_destruct = xsk_destruct; | |
757 | sk_refcnt_debug_inc(sk); | |
758 | ||
759 | xs = xdp_sk(sk); | |
760 | mutex_init(&xs->mutex); | |
a9744f7c | 761 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f BT |
762 | |
763 | local_bh_disable(); | |
764 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
765 | local_bh_enable(); | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
770 | static const struct net_proto_family xsk_family_ops = { | |
771 | .family = PF_XDP, | |
772 | .create = xsk_create, | |
773 | .owner = THIS_MODULE, | |
774 | }; | |
775 | ||
776 | static int __init xsk_init(void) | |
777 | { | |
778 | int err; | |
779 | ||
780 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
781 | if (err) | |
782 | goto out; | |
783 | ||
784 | err = sock_register(&xsk_family_ops); | |
785 | if (err) | |
786 | goto out_proto; | |
787 | ||
788 | return 0; | |
789 | ||
790 | out_proto: | |
791 | proto_unregister(&xsk_proto); | |
792 | out: | |
793 | return err; | |
794 | } | |
795 | ||
796 | fs_initcall(xsk_init); |