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 | 29 | #include "xdp_umem.h" |
a36b38aa | 30 | #include "xsk.h" |
c0c77d8f | 31 | |
35fcde7f MK |
32 | #define TX_BATCH_SIZE 16 |
33 | ||
fbfc504a BT |
34 | bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs) |
35 | { | |
173d3adb BT |
36 | return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) && |
37 | READ_ONCE(xs->umem->fq); | |
fbfc504a BT |
38 | } |
39 | ||
173d3adb BT |
40 | u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr) |
41 | { | |
42 | return xskq_peek_addr(umem->fq, addr); | |
43 | } | |
44 | EXPORT_SYMBOL(xsk_umem_peek_addr); | |
45 | ||
46 | void xsk_umem_discard_addr(struct xdp_umem *umem) | |
47 | { | |
48 | xskq_discard_addr(umem->fq); | |
49 | } | |
50 | EXPORT_SYMBOL(xsk_umem_discard_addr); | |
51 | ||
52 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) | |
c497176c | 53 | { |
18baed26 BT |
54 | void *to_buf, *from_buf; |
55 | u32 metalen; | |
bbff2f32 | 56 | u64 addr; |
4e64c835 | 57 | int err; |
c497176c | 58 | |
bbff2f32 | 59 | if (!xskq_peek_addr(xs->umem->fq, &addr) || |
18baed26 | 60 | len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) { |
a509a955 | 61 | xs->rx_dropped++; |
c497176c | 62 | return -ENOSPC; |
a509a955 | 63 | } |
c497176c | 64 | |
bbff2f32 BT |
65 | addr += xs->umem->headroom; |
66 | ||
18baed26 BT |
67 | if (unlikely(xdp_data_meta_unsupported(xdp))) { |
68 | from_buf = xdp->data; | |
69 | metalen = 0; | |
70 | } else { | |
71 | from_buf = xdp->data_meta; | |
72 | metalen = xdp->data - xdp->data_meta; | |
73 | } | |
74 | ||
75 | to_buf = xdp_umem_get_data(xs->umem, addr); | |
76 | memcpy(to_buf, from_buf, len + metalen); | |
77 | addr += metalen; | |
bbff2f32 | 78 | err = xskq_produce_batch_desc(xs->rx, addr, len); |
173d3adb | 79 | if (!err) { |
bbff2f32 | 80 | xskq_discard_addr(xs->umem->fq); |
173d3adb BT |
81 | xdp_return_buff(xdp); |
82 | return 0; | |
83 | } | |
c497176c | 84 | |
173d3adb | 85 | xs->rx_dropped++; |
c497176c BT |
86 | return err; |
87 | } | |
88 | ||
173d3adb | 89 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c497176c | 90 | { |
173d3adb | 91 | int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len); |
c497176c | 92 | |
2d55d614 | 93 | if (err) |
173d3adb | 94 | xs->rx_dropped++; |
c497176c BT |
95 | |
96 | return err; | |
97 | } | |
98 | ||
173d3adb BT |
99 | int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
100 | { | |
101 | u32 len; | |
102 | ||
103 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) | |
104 | return -EINVAL; | |
105 | ||
106 | len = xdp->data_end - xdp->data; | |
107 | ||
108 | return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ? | |
109 | __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len); | |
110 | } | |
111 | ||
c497176c BT |
112 | void xsk_flush(struct xdp_sock *xs) |
113 | { | |
114 | xskq_produce_flush_desc(xs->rx); | |
115 | xs->sk.sk_data_ready(&xs->sk); | |
116 | } | |
117 | ||
118 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
119 | { | |
18baed26 | 120 | u32 metalen = xdp->data - xdp->data_meta; |
173d3adb BT |
121 | u32 len = xdp->data_end - xdp->data; |
122 | void *buffer; | |
123 | u64 addr; | |
c497176c BT |
124 | int err; |
125 | ||
5d902372 BT |
126 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
127 | return -EINVAL; | |
128 | ||
173d3adb | 129 | if (!xskq_peek_addr(xs->umem->fq, &addr) || |
18baed26 | 130 | len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) { |
173d3adb BT |
131 | xs->rx_dropped++; |
132 | return -ENOSPC; | |
133 | } | |
134 | ||
135 | addr += xs->umem->headroom; | |
136 | ||
137 | buffer = xdp_umem_get_data(xs->umem, addr); | |
18baed26 BT |
138 | memcpy(buffer, xdp->data_meta, len + metalen); |
139 | addr += metalen; | |
173d3adb BT |
140 | err = xskq_produce_batch_desc(xs->rx, addr, len); |
141 | if (!err) { | |
142 | xskq_discard_addr(xs->umem->fq); | |
c497176c | 143 | xsk_flush(xs); |
173d3adb BT |
144 | return 0; |
145 | } | |
c497176c | 146 | |
173d3adb | 147 | xs->rx_dropped++; |
c497176c BT |
148 | return err; |
149 | } | |
150 | ||
ac98d8aa MK |
151 | void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries) |
152 | { | |
153 | xskq_produce_flush_addr_n(umem->cq, nb_entries); | |
154 | } | |
155 | EXPORT_SYMBOL(xsk_umem_complete_tx); | |
156 | ||
157 | void xsk_umem_consume_tx_done(struct xdp_umem *umem) | |
158 | { | |
159 | struct xdp_sock *xs; | |
160 | ||
161 | rcu_read_lock(); | |
162 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
163 | xs->sk.sk_write_space(&xs->sk); | |
164 | } | |
165 | rcu_read_unlock(); | |
166 | } | |
167 | EXPORT_SYMBOL(xsk_umem_consume_tx_done); | |
168 | ||
169 | bool xsk_umem_consume_tx(struct xdp_umem *umem, dma_addr_t *dma, u32 *len) | |
170 | { | |
171 | struct xdp_desc desc; | |
172 | struct xdp_sock *xs; | |
173 | ||
174 | rcu_read_lock(); | |
175 | list_for_each_entry_rcu(xs, &umem->xsk_list, list) { | |
176 | if (!xskq_peek_desc(xs->tx, &desc)) | |
177 | continue; | |
178 | ||
179 | if (xskq_produce_addr_lazy(umem->cq, desc.addr)) | |
180 | goto out; | |
181 | ||
182 | *dma = xdp_umem_get_dma(umem, desc.addr); | |
183 | *len = desc.len; | |
184 | ||
185 | xskq_discard_desc(xs->tx); | |
186 | rcu_read_unlock(); | |
187 | return true; | |
188 | } | |
189 | ||
190 | out: | |
191 | rcu_read_unlock(); | |
192 | return false; | |
193 | } | |
194 | EXPORT_SYMBOL(xsk_umem_consume_tx); | |
195 | ||
196 | static int xsk_zc_xmit(struct sock *sk) | |
197 | { | |
198 | struct xdp_sock *xs = xdp_sk(sk); | |
199 | struct net_device *dev = xs->dev; | |
200 | ||
201 | return dev->netdev_ops->ndo_xsk_async_xmit(dev, xs->queue_id); | |
202 | } | |
203 | ||
35fcde7f MK |
204 | static void xsk_destruct_skb(struct sk_buff *skb) |
205 | { | |
bbff2f32 | 206 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 207 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 208 | unsigned long flags; |
35fcde7f | 209 | |
a9744f7c | 210 | spin_lock_irqsave(&xs->tx_completion_lock, flags); |
bbff2f32 | 211 | WARN_ON_ONCE(xskq_produce_addr(xs->umem->cq, addr)); |
a9744f7c | 212 | spin_unlock_irqrestore(&xs->tx_completion_lock, flags); |
35fcde7f MK |
213 | |
214 | sock_wfree(skb); | |
215 | } | |
216 | ||
217 | static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, | |
218 | size_t total_len) | |
219 | { | |
35fcde7f MK |
220 | u32 max_batch = TX_BATCH_SIZE; |
221 | struct xdp_sock *xs = xdp_sk(sk); | |
222 | bool sent_frame = false; | |
223 | struct xdp_desc desc; | |
224 | struct sk_buff *skb; | |
225 | int err = 0; | |
226 | ||
35fcde7f MK |
227 | mutex_lock(&xs->mutex); |
228 | ||
229 | while (xskq_peek_desc(xs->tx, &desc)) { | |
230 | char *buffer; | |
bbff2f32 BT |
231 | u64 addr; |
232 | u32 len; | |
35fcde7f MK |
233 | |
234 | if (max_batch-- == 0) { | |
235 | err = -EAGAIN; | |
236 | goto out; | |
237 | } | |
238 | ||
9684f5e7 | 239 | if (xskq_reserve_addr(xs->umem->cq)) |
35fcde7f | 240 | goto out; |
35fcde7f | 241 | |
509d7648 | 242 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
2e59dd5e | 243 | goto out; |
2e59dd5e | 244 | |
09210c4b | 245 | len = desc.len; |
ac98d8aa | 246 | skb = sock_alloc_send_skb(sk, len, 1, &err); |
35fcde7f MK |
247 | if (unlikely(!skb)) { |
248 | err = -EAGAIN; | |
249 | goto out; | |
250 | } | |
251 | ||
252 | skb_put(skb, len); | |
bbff2f32 BT |
253 | addr = desc.addr; |
254 | buffer = xdp_umem_get_data(xs->umem, addr); | |
35fcde7f MK |
255 | err = skb_store_bits(skb, 0, buffer, len); |
256 | if (unlikely(err)) { | |
257 | kfree_skb(skb); | |
258 | goto out; | |
259 | } | |
260 | ||
261 | skb->dev = xs->dev; | |
262 | skb->priority = sk->sk_priority; | |
263 | skb->mark = sk->sk_mark; | |
bbff2f32 | 264 | skb_shinfo(skb)->destructor_arg = (void *)(long)addr; |
35fcde7f MK |
265 | skb->destructor = xsk_destruct_skb; |
266 | ||
267 | err = dev_direct_xmit(skb, xs->queue_id); | |
fe588685 | 268 | xskq_discard_desc(xs->tx); |
35fcde7f MK |
269 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
270 | if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) { | |
fe588685 MK |
271 | /* SKB completed but not sent */ |
272 | err = -EBUSY; | |
35fcde7f MK |
273 | goto out; |
274 | } | |
275 | ||
276 | sent_frame = true; | |
35fcde7f MK |
277 | } |
278 | ||
279 | out: | |
280 | if (sent_frame) | |
281 | sk->sk_write_space(sk); | |
282 | ||
283 | mutex_unlock(&xs->mutex); | |
284 | return err; | |
285 | } | |
286 | ||
287 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) | |
288 | { | |
ac98d8aa | 289 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
290 | struct sock *sk = sock->sk; |
291 | struct xdp_sock *xs = xdp_sk(sk); | |
292 | ||
293 | if (unlikely(!xs->dev)) | |
294 | return -ENXIO; | |
295 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
296 | return -ENETDOWN; | |
6efb4436 MK |
297 | if (unlikely(!xs->tx)) |
298 | return -ENOBUFS; | |
ac98d8aa MK |
299 | if (need_wait) |
300 | return -EOPNOTSUPP; | |
35fcde7f | 301 | |
ac98d8aa | 302 | return (xs->zc) ? xsk_zc_xmit(sk) : xsk_generic_xmit(sk, m, total_len); |
35fcde7f MK |
303 | } |
304 | ||
a11e1d43 LT |
305 | static unsigned int xsk_poll(struct file *file, struct socket *sock, |
306 | struct poll_table_struct *wait) | |
c497176c | 307 | { |
a11e1d43 | 308 | unsigned int mask = datagram_poll(file, sock, wait); |
c497176c BT |
309 | struct sock *sk = sock->sk; |
310 | struct xdp_sock *xs = xdp_sk(sk); | |
311 | ||
312 | if (xs->rx && !xskq_empty_desc(xs->rx)) | |
313 | mask |= POLLIN | POLLRDNORM; | |
35fcde7f MK |
314 | if (xs->tx && !xskq_full_desc(xs->tx)) |
315 | mask |= POLLOUT | POLLWRNORM; | |
c497176c BT |
316 | |
317 | return mask; | |
318 | } | |
319 | ||
b9b6b68e BT |
320 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
321 | bool umem_queue) | |
423f3832 MK |
322 | { |
323 | struct xsk_queue *q; | |
324 | ||
325 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
326 | return -EINVAL; | |
327 | ||
b9b6b68e | 328 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
329 | if (!q) |
330 | return -ENOMEM; | |
331 | ||
37b07693 BT |
332 | /* Make sure queue is ready before it can be seen by others */ |
333 | smp_wmb(); | |
423f3832 MK |
334 | *queue = q; |
335 | return 0; | |
336 | } | |
337 | ||
c0c77d8f BT |
338 | static int xsk_release(struct socket *sock) |
339 | { | |
340 | struct sock *sk = sock->sk; | |
965a9909 | 341 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
342 | struct net *net; |
343 | ||
344 | if (!sk) | |
345 | return 0; | |
346 | ||
347 | net = sock_net(sk); | |
348 | ||
1d0dc069 BT |
349 | mutex_lock(&net->xdp.lock); |
350 | sk_del_node_init_rcu(sk); | |
351 | mutex_unlock(&net->xdp.lock); | |
352 | ||
c0c77d8f BT |
353 | local_bh_disable(); |
354 | sock_prot_inuse_add(net, sk->sk_prot, -1); | |
355 | local_bh_enable(); | |
356 | ||
965a9909 | 357 | if (xs->dev) { |
541d7fdd BT |
358 | struct net_device *dev = xs->dev; |
359 | ||
959b71db | 360 | /* Wait for driver to stop using the xdp socket. */ |
541d7fdd | 361 | xdp_del_sk_umem(xs->umem, xs); |
965a9909 | 362 | xs->dev = NULL; |
541d7fdd BT |
363 | synchronize_net(); |
364 | dev_put(dev); | |
965a9909 MK |
365 | } |
366 | ||
541d7fdd BT |
367 | xskq_destroy(xs->rx); |
368 | xskq_destroy(xs->tx); | |
369 | ||
c0c77d8f BT |
370 | sock_orphan(sk); |
371 | sock->sk = NULL; | |
372 | ||
373 | sk_refcnt_debug_release(sk); | |
374 | sock_put(sk); | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
965a9909 MK |
379 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
380 | { | |
381 | struct socket *sock; | |
382 | int err; | |
383 | ||
384 | sock = sockfd_lookup(fd, &err); | |
385 | if (!sock) | |
386 | return ERR_PTR(-ENOTSOCK); | |
387 | ||
388 | if (sock->sk->sk_family != PF_XDP) { | |
389 | sockfd_put(sock); | |
390 | return ERR_PTR(-ENOPROTOOPT); | |
391 | } | |
392 | ||
393 | return sock; | |
394 | } | |
395 | ||
396 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
397 | { | |
398 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
399 | struct sock *sk = sock->sk; | |
965a9909 | 400 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 401 | struct net_device *dev; |
173d3adb | 402 | u32 flags, qid; |
965a9909 MK |
403 | int err = 0; |
404 | ||
405 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
406 | return -EINVAL; | |
407 | if (sxdp->sxdp_family != AF_XDP) | |
408 | return -EINVAL; | |
409 | ||
f54ba391 BT |
410 | flags = sxdp->sxdp_flags; |
411 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY)) | |
412 | return -EINVAL; | |
413 | ||
965a9909 | 414 | mutex_lock(&xs->mutex); |
959b71db BT |
415 | if (xs->dev) { |
416 | err = -EBUSY; | |
417 | goto out_release; | |
418 | } | |
419 | ||
965a9909 MK |
420 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
421 | if (!dev) { | |
422 | err = -ENODEV; | |
423 | goto out_release; | |
424 | } | |
425 | ||
f6145903 | 426 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
427 | err = -EINVAL; |
428 | goto out_unlock; | |
429 | } | |
430 | ||
173d3adb | 431 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
432 | |
433 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
434 | struct xdp_sock *umem_xs; |
435 | struct socket *sock; | |
436 | ||
173d3adb BT |
437 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) { |
438 | /* Cannot specify flags for shared sockets. */ | |
439 | err = -EINVAL; | |
440 | goto out_unlock; | |
441 | } | |
442 | ||
965a9909 MK |
443 | if (xs->umem) { |
444 | /* We have already our own. */ | |
445 | err = -EINVAL; | |
446 | goto out_unlock; | |
447 | } | |
448 | ||
449 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
450 | if (IS_ERR(sock)) { | |
451 | err = PTR_ERR(sock); | |
452 | goto out_unlock; | |
453 | } | |
454 | ||
455 | umem_xs = xdp_sk(sock->sk); | |
456 | if (!umem_xs->umem) { | |
457 | /* No umem to inherit. */ | |
458 | err = -EBADF; | |
459 | sockfd_put(sock); | |
460 | goto out_unlock; | |
173d3adb | 461 | } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) { |
965a9909 MK |
462 | err = -EINVAL; |
463 | sockfd_put(sock); | |
464 | goto out_unlock; | |
465 | } | |
466 | ||
467 | xdp_get_umem(umem_xs->umem); | |
965a9909 MK |
468 | xs->umem = umem_xs->umem; |
469 | sockfd_put(sock); | |
470 | } else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) { | |
471 | err = -EINVAL; | |
472 | goto out_unlock; | |
c497176c BT |
473 | } else { |
474 | /* This xsk has its own umem. */ | |
93ee30f3 MK |
475 | xskq_set_umem(xs->umem->fq, xs->umem->size, |
476 | xs->umem->chunk_mask); | |
477 | xskq_set_umem(xs->umem->cq, xs->umem->size, | |
478 | xs->umem->chunk_mask); | |
173d3adb BT |
479 | |
480 | err = xdp_umem_assign_dev(xs->umem, dev, qid, flags); | |
481 | if (err) | |
482 | goto out_unlock; | |
965a9909 MK |
483 | } |
484 | ||
965a9909 | 485 | xs->dev = dev; |
ac98d8aa MK |
486 | xs->zc = xs->umem->zc; |
487 | xs->queue_id = qid; | |
93ee30f3 MK |
488 | xskq_set_umem(xs->rx, xs->umem->size, xs->umem->chunk_mask); |
489 | xskq_set_umem(xs->tx, xs->umem->size, xs->umem->chunk_mask); | |
ac98d8aa | 490 | xdp_add_sk_umem(xs->umem, xs); |
965a9909 MK |
491 | |
492 | out_unlock: | |
493 | if (err) | |
494 | dev_put(dev); | |
495 | out_release: | |
496 | mutex_unlock(&xs->mutex); | |
497 | return err; | |
498 | } | |
499 | ||
c0c77d8f BT |
500 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
501 | char __user *optval, unsigned int optlen) | |
502 | { | |
503 | struct sock *sk = sock->sk; | |
504 | struct xdp_sock *xs = xdp_sk(sk); | |
505 | int err; | |
506 | ||
507 | if (level != SOL_XDP) | |
508 | return -ENOPROTOOPT; | |
509 | ||
510 | switch (optname) { | |
b9b6b68e | 511 | case XDP_RX_RING: |
f6145903 | 512 | case XDP_TX_RING: |
b9b6b68e BT |
513 | { |
514 | struct xsk_queue **q; | |
515 | int entries; | |
516 | ||
517 | if (optlen < sizeof(entries)) | |
518 | return -EINVAL; | |
519 | if (copy_from_user(&entries, optval, sizeof(entries))) | |
520 | return -EFAULT; | |
521 | ||
522 | mutex_lock(&xs->mutex); | |
f6145903 | 523 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e BT |
524 | err = xsk_init_queue(entries, q, false); |
525 | mutex_unlock(&xs->mutex); | |
526 | return err; | |
527 | } | |
c0c77d8f BT |
528 | case XDP_UMEM_REG: |
529 | { | |
530 | struct xdp_umem_reg mr; | |
531 | struct xdp_umem *umem; | |
532 | ||
c0c77d8f BT |
533 | if (copy_from_user(&mr, optval, sizeof(mr))) |
534 | return -EFAULT; | |
535 | ||
536 | mutex_lock(&xs->mutex); | |
a49049ea BT |
537 | if (xs->umem) { |
538 | mutex_unlock(&xs->mutex); | |
539 | return -EBUSY; | |
540 | } | |
c0c77d8f | 541 | |
a49049ea BT |
542 | umem = xdp_umem_create(&mr); |
543 | if (IS_ERR(umem)) { | |
c0c77d8f | 544 | mutex_unlock(&xs->mutex); |
a49049ea | 545 | return PTR_ERR(umem); |
c0c77d8f BT |
546 | } |
547 | ||
548 | /* Make sure umem is ready before it can be seen by others */ | |
549 | smp_wmb(); | |
c0c77d8f BT |
550 | xs->umem = umem; |
551 | mutex_unlock(&xs->mutex); | |
552 | return 0; | |
553 | } | |
423f3832 | 554 | case XDP_UMEM_FILL_RING: |
fe230832 | 555 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
556 | { |
557 | struct xsk_queue **q; | |
558 | int entries; | |
559 | ||
423f3832 MK |
560 | if (copy_from_user(&entries, optval, sizeof(entries))) |
561 | return -EFAULT; | |
562 | ||
563 | mutex_lock(&xs->mutex); | |
a49049ea BT |
564 | if (!xs->umem) { |
565 | mutex_unlock(&xs->mutex); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
fe230832 MK |
569 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq : |
570 | &xs->umem->cq; | |
b9b6b68e | 571 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
572 | mutex_unlock(&xs->mutex); |
573 | return err; | |
574 | } | |
c0c77d8f BT |
575 | default: |
576 | break; | |
577 | } | |
578 | ||
579 | return -ENOPROTOOPT; | |
580 | } | |
581 | ||
af75d9e0 MK |
582 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
583 | char __user *optval, int __user *optlen) | |
584 | { | |
585 | struct sock *sk = sock->sk; | |
586 | struct xdp_sock *xs = xdp_sk(sk); | |
587 | int len; | |
588 | ||
589 | if (level != SOL_XDP) | |
590 | return -ENOPROTOOPT; | |
591 | ||
592 | if (get_user(len, optlen)) | |
593 | return -EFAULT; | |
594 | if (len < 0) | |
595 | return -EINVAL; | |
596 | ||
597 | switch (optname) { | |
598 | case XDP_STATISTICS: | |
599 | { | |
600 | struct xdp_statistics stats; | |
601 | ||
602 | if (len < sizeof(stats)) | |
603 | return -EINVAL; | |
604 | ||
605 | mutex_lock(&xs->mutex); | |
606 | stats.rx_dropped = xs->rx_dropped; | |
607 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); | |
608 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
609 | mutex_unlock(&xs->mutex); | |
610 | ||
611 | if (copy_to_user(optval, &stats, sizeof(stats))) | |
612 | return -EFAULT; | |
613 | if (put_user(sizeof(stats), optlen)) | |
614 | return -EFAULT; | |
615 | ||
616 | return 0; | |
617 | } | |
b3a9e0be BT |
618 | case XDP_MMAP_OFFSETS: |
619 | { | |
620 | struct xdp_mmap_offsets off; | |
621 | ||
622 | if (len < sizeof(off)) | |
623 | return -EINVAL; | |
624 | ||
625 | off.rx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
626 | off.rx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
627 | off.rx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
628 | off.tx.producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
629 | off.tx.consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
630 | off.tx.desc = offsetof(struct xdp_rxtx_ring, desc); | |
631 | ||
632 | off.fr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
633 | off.fr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
634 | off.fr.desc = offsetof(struct xdp_umem_ring, desc); | |
635 | off.cr.producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
636 | off.cr.consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
637 | off.cr.desc = offsetof(struct xdp_umem_ring, desc); | |
638 | ||
639 | len = sizeof(off); | |
640 | if (copy_to_user(optval, &off, len)) | |
641 | return -EFAULT; | |
642 | if (put_user(len, optlen)) | |
643 | return -EFAULT; | |
644 | ||
645 | return 0; | |
646 | } | |
af75d9e0 MK |
647 | default: |
648 | break; | |
649 | } | |
650 | ||
651 | return -EOPNOTSUPP; | |
652 | } | |
653 | ||
423f3832 MK |
654 | static int xsk_mmap(struct file *file, struct socket *sock, |
655 | struct vm_area_struct *vma) | |
656 | { | |
a5a16e43 | 657 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
658 | unsigned long size = vma->vm_end - vma->vm_start; |
659 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
660 | struct xsk_queue *q = NULL; | |
37b07693 | 661 | struct xdp_umem *umem; |
423f3832 MK |
662 | unsigned long pfn; |
663 | struct page *qpg; | |
664 | ||
b9b6b68e | 665 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 666 | q = READ_ONCE(xs->rx); |
f6145903 | 667 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 668 | q = READ_ONCE(xs->tx); |
b9b6b68e | 669 | } else { |
37b07693 BT |
670 | umem = READ_ONCE(xs->umem); |
671 | if (!umem) | |
b9b6b68e | 672 | return -EINVAL; |
423f3832 | 673 | |
e6762c8b MK |
674 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
675 | smp_rmb(); | |
b9b6b68e | 676 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
37b07693 | 677 | q = READ_ONCE(umem->fq); |
fe230832 | 678 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
37b07693 | 679 | q = READ_ONCE(umem->cq); |
b9b6b68e | 680 | } |
423f3832 MK |
681 | |
682 | if (!q) | |
683 | return -EINVAL; | |
684 | ||
e6762c8b MK |
685 | /* Matches the smp_wmb() in xsk_init_queue */ |
686 | smp_rmb(); | |
423f3832 MK |
687 | qpg = virt_to_head_page(q->ring); |
688 | if (size > (PAGE_SIZE << compound_order(qpg))) | |
689 | return -EINVAL; | |
690 | ||
691 | pfn = virt_to_phys(q->ring) >> PAGE_SHIFT; | |
692 | return remap_pfn_range(vma, vma->vm_start, pfn, | |
693 | size, vma->vm_page_prot); | |
694 | } | |
695 | ||
c0c77d8f BT |
696 | static struct proto xsk_proto = { |
697 | .name = "XDP", | |
698 | .owner = THIS_MODULE, | |
699 | .obj_size = sizeof(struct xdp_sock), | |
700 | }; | |
701 | ||
702 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
703 | .family = PF_XDP, |
704 | .owner = THIS_MODULE, | |
705 | .release = xsk_release, | |
706 | .bind = xsk_bind, | |
707 | .connect = sock_no_connect, | |
708 | .socketpair = sock_no_socketpair, | |
709 | .accept = sock_no_accept, | |
710 | .getname = sock_no_getname, | |
a11e1d43 | 711 | .poll = xsk_poll, |
c2f4374b BT |
712 | .ioctl = sock_no_ioctl, |
713 | .listen = sock_no_listen, | |
714 | .shutdown = sock_no_shutdown, | |
715 | .setsockopt = xsk_setsockopt, | |
716 | .getsockopt = xsk_getsockopt, | |
717 | .sendmsg = xsk_sendmsg, | |
718 | .recvmsg = sock_no_recvmsg, | |
719 | .mmap = xsk_mmap, | |
720 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
721 | }; |
722 | ||
11fe9262 BT |
723 | static void xsk_destruct(struct sock *sk) |
724 | { | |
725 | struct xdp_sock *xs = xdp_sk(sk); | |
726 | ||
727 | if (!sock_flag(sk, SOCK_DEAD)) | |
728 | return; | |
729 | ||
730 | xdp_put_umem(xs->umem); | |
731 | ||
732 | sk_refcnt_debug_dec(sk); | |
733 | } | |
734 | ||
c0c77d8f BT |
735 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
736 | int kern) | |
737 | { | |
738 | struct sock *sk; | |
739 | struct xdp_sock *xs; | |
740 | ||
741 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
742 | return -EPERM; | |
743 | if (sock->type != SOCK_RAW) | |
744 | return -ESOCKTNOSUPPORT; | |
745 | ||
746 | if (protocol) | |
747 | return -EPROTONOSUPPORT; | |
748 | ||
749 | sock->state = SS_UNCONNECTED; | |
750 | ||
751 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
752 | if (!sk) | |
753 | return -ENOBUFS; | |
754 | ||
755 | sock->ops = &xsk_proto_ops; | |
756 | ||
757 | sock_init_data(sock, sk); | |
758 | ||
759 | sk->sk_family = PF_XDP; | |
760 | ||
11fe9262 BT |
761 | sk->sk_destruct = xsk_destruct; |
762 | sk_refcnt_debug_inc(sk); | |
763 | ||
cee27167 BT |
764 | sock_set_flag(sk, SOCK_RCU_FREE); |
765 | ||
c0c77d8f BT |
766 | xs = xdp_sk(sk); |
767 | mutex_init(&xs->mutex); | |
a9744f7c | 768 | spin_lock_init(&xs->tx_completion_lock); |
c0c77d8f | 769 | |
1d0dc069 BT |
770 | mutex_lock(&net->xdp.lock); |
771 | sk_add_node_rcu(sk, &net->xdp.list); | |
772 | mutex_unlock(&net->xdp.lock); | |
773 | ||
c0c77d8f BT |
774 | local_bh_disable(); |
775 | sock_prot_inuse_add(net, &xsk_proto, 1); | |
776 | local_bh_enable(); | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
781 | static const struct net_proto_family xsk_family_ops = { | |
782 | .family = PF_XDP, | |
783 | .create = xsk_create, | |
784 | .owner = THIS_MODULE, | |
785 | }; | |
786 | ||
1d0dc069 BT |
787 | static int __net_init xsk_net_init(struct net *net) |
788 | { | |
789 | mutex_init(&net->xdp.lock); | |
790 | INIT_HLIST_HEAD(&net->xdp.list); | |
791 | return 0; | |
792 | } | |
793 | ||
794 | static void __net_exit xsk_net_exit(struct net *net) | |
795 | { | |
796 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
797 | } | |
798 | ||
799 | static struct pernet_operations xsk_net_ops = { | |
800 | .init = xsk_net_init, | |
801 | .exit = xsk_net_exit, | |
802 | }; | |
803 | ||
c0c77d8f BT |
804 | static int __init xsk_init(void) |
805 | { | |
806 | int err; | |
807 | ||
808 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
809 | if (err) | |
810 | goto out; | |
811 | ||
812 | err = sock_register(&xsk_family_ops); | |
813 | if (err) | |
814 | goto out_proto; | |
815 | ||
1d0dc069 BT |
816 | err = register_pernet_subsys(&xsk_net_ops); |
817 | if (err) | |
818 | goto out_sk; | |
c0c77d8f BT |
819 | return 0; |
820 | ||
1d0dc069 BT |
821 | out_sk: |
822 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
823 | out_proto: |
824 | proto_unregister(&xsk_proto); | |
825 | out: | |
826 | return err; | |
827 | } | |
828 | ||
829 | fs_initcall(xsk_init); |