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> |
951bce29 | 25 | #include <linux/vmalloc.h> |
a71506a4 | 26 | #include <net/xdp_sock_drv.h> |
a0731952 | 27 | #include <net/busy_poll.h> |
b9b6b68e | 28 | #include <net/xdp.h> |
c0c77d8f | 29 | |
423f3832 | 30 | #include "xsk_queue.h" |
c0c77d8f | 31 | #include "xdp_umem.h" |
a36b38aa | 32 | #include "xsk.h" |
c0c77d8f | 33 | |
e7a1c130 | 34 | #define TX_BATCH_SIZE 32 |
35fcde7f | 35 | |
e312b9e7 BT |
36 | static DEFINE_PER_CPU(struct list_head, xskmap_flush_list); |
37 | ||
c4655761 | 38 | void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 39 | { |
c2d3d6a4 | 40 | if (pool->cached_need_wakeup & XDP_WAKEUP_RX) |
77cd0d7b MK |
41 | return; |
42 | ||
7361f9c3 | 43 | pool->fq->ring->flags |= XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 44 | pool->cached_need_wakeup |= XDP_WAKEUP_RX; |
77cd0d7b MK |
45 | } |
46 | EXPORT_SYMBOL(xsk_set_rx_need_wakeup); | |
47 | ||
c4655761 | 48 | void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
49 | { |
50 | struct xdp_sock *xs; | |
51 | ||
c2d3d6a4 | 52 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) |
77cd0d7b MK |
53 | return; |
54 | ||
55 | rcu_read_lock(); | |
a5aa8e52 | 56 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
57 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
58 | } | |
59 | rcu_read_unlock(); | |
60 | ||
c2d3d6a4 | 61 | pool->cached_need_wakeup |= XDP_WAKEUP_TX; |
77cd0d7b MK |
62 | } |
63 | EXPORT_SYMBOL(xsk_set_tx_need_wakeup); | |
64 | ||
c4655761 | 65 | void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 66 | { |
c2d3d6a4 | 67 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_RX)) |
77cd0d7b MK |
68 | return; |
69 | ||
7361f9c3 | 70 | pool->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
c2d3d6a4 | 71 | pool->cached_need_wakeup &= ~XDP_WAKEUP_RX; |
77cd0d7b MK |
72 | } |
73 | EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); | |
74 | ||
c4655761 | 75 | void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b MK |
76 | { |
77 | struct xdp_sock *xs; | |
78 | ||
c2d3d6a4 | 79 | if (!(pool->cached_need_wakeup & XDP_WAKEUP_TX)) |
77cd0d7b MK |
80 | return; |
81 | ||
82 | rcu_read_lock(); | |
a5aa8e52 | 83 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
77cd0d7b MK |
84 | xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
85 | } | |
86 | rcu_read_unlock(); | |
87 | ||
c2d3d6a4 | 88 | pool->cached_need_wakeup &= ~XDP_WAKEUP_TX; |
77cd0d7b MK |
89 | } |
90 | EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); | |
91 | ||
c4655761 | 92 | bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool) |
77cd0d7b | 93 | { |
c2d3d6a4 | 94 | return pool->uses_need_wakeup; |
77cd0d7b | 95 | } |
c4655761 | 96 | EXPORT_SYMBOL(xsk_uses_need_wakeup); |
77cd0d7b | 97 | |
1c1efc2a MK |
98 | struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev, |
99 | u16 queue_id) | |
100 | { | |
101 | if (queue_id < dev->real_num_rx_queues) | |
102 | return dev->_rx[queue_id].pool; | |
103 | if (queue_id < dev->real_num_tx_queues) | |
104 | return dev->_tx[queue_id].pool; | |
105 | ||
106 | return NULL; | |
107 | } | |
108 | EXPORT_SYMBOL(xsk_get_pool_from_qid); | |
109 | ||
110 | void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id) | |
111 | { | |
b425e24a | 112 | if (queue_id < dev->num_rx_queues) |
1c1efc2a | 113 | dev->_rx[queue_id].pool = NULL; |
b425e24a | 114 | if (queue_id < dev->num_tx_queues) |
1c1efc2a MK |
115 | dev->_tx[queue_id].pool = NULL; |
116 | } | |
117 | ||
118 | /* The buffer pool is stored both in the _rx struct and the _tx struct as we do | |
119 | * not know if the device has more tx queues than rx, or the opposite. | |
120 | * This might also change during run time. | |
121 | */ | |
122 | int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool, | |
123 | u16 queue_id) | |
124 | { | |
125 | if (queue_id >= max_t(unsigned int, | |
126 | dev->real_num_rx_queues, | |
127 | dev->real_num_tx_queues)) | |
128 | return -EINVAL; | |
129 | ||
130 | if (queue_id < dev->real_num_rx_queues) | |
131 | dev->_rx[queue_id].pool = pool; | |
132 | if (queue_id < dev->real_num_tx_queues) | |
133 | dev->_tx[queue_id].pool = pool; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
2b43470a | 138 | static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
c05cd364 | 139 | { |
2b43470a BT |
140 | struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); |
141 | u64 addr; | |
142 | int err; | |
c05cd364 | 143 | |
2b43470a BT |
144 | addr = xp_get_handle(xskb); |
145 | err = xskq_prod_reserve_desc(xs->rx, addr, len); | |
146 | if (err) { | |
8aa5a335 | 147 | xs->rx_queue_full++; |
2b43470a | 148 | return err; |
c05cd364 KL |
149 | } |
150 | ||
2b43470a BT |
151 | xp_release(xskb); |
152 | return 0; | |
c05cd364 KL |
153 | } |
154 | ||
2b43470a | 155 | static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len) |
c497176c | 156 | { |
2b43470a | 157 | void *from_buf, *to_buf; |
18baed26 | 158 | u32 metalen; |
c497176c | 159 | |
2b43470a BT |
160 | if (unlikely(xdp_data_meta_unsupported(from))) { |
161 | from_buf = from->data; | |
162 | to_buf = to->data; | |
18baed26 BT |
163 | metalen = 0; |
164 | } else { | |
2b43470a BT |
165 | from_buf = from->data_meta; |
166 | metalen = from->data - from->data_meta; | |
167 | to_buf = to->data - metalen; | |
18baed26 BT |
168 | } |
169 | ||
2b43470a | 170 | memcpy(to_buf, from_buf, len + metalen); |
c497176c BT |
171 | } |
172 | ||
458f7272 | 173 | static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
c497176c | 174 | { |
2b43470a BT |
175 | struct xdp_buff *xsk_xdp; |
176 | int err; | |
458f7272 | 177 | u32 len; |
c497176c | 178 | |
458f7272 | 179 | len = xdp->data_end - xdp->data; |
c4655761 | 180 | if (len > xsk_pool_get_rx_frame_size(xs->pool)) { |
2b43470a BT |
181 | xs->rx_dropped++; |
182 | return -ENOSPC; | |
183 | } | |
184 | ||
c4655761 | 185 | xsk_xdp = xsk_buff_alloc(xs->pool); |
2b43470a | 186 | if (!xsk_xdp) { |
173d3adb | 187 | xs->rx_dropped++; |
c6c1f11b | 188 | return -ENOMEM; |
2b43470a | 189 | } |
c497176c | 190 | |
2b43470a BT |
191 | xsk_copy_xdp(xsk_xdp, xdp, len); |
192 | err = __xsk_rcv_zc(xs, xsk_xdp, len); | |
193 | if (err) { | |
194 | xsk_buff_free(xsk_xdp); | |
195 | return err; | |
196 | } | |
2b43470a | 197 | return 0; |
c497176c BT |
198 | } |
199 | ||
3413f041 XZ |
200 | static bool xsk_tx_writeable(struct xdp_sock *xs) |
201 | { | |
202 | if (xskq_cons_present_entries(xs->tx) > xs->tx->nentries / 2) | |
203 | return false; | |
204 | ||
205 | return true; | |
206 | } | |
207 | ||
42fddcc7 BT |
208 | static bool xsk_is_bound(struct xdp_sock *xs) |
209 | { | |
210 | if (READ_ONCE(xs->state) == XSK_BOUND) { | |
211 | /* Matches smp_wmb() in bind(). */ | |
212 | smp_rmb(); | |
213 | return true; | |
214 | } | |
215 | return false; | |
216 | } | |
217 | ||
458f7272 | 218 | static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp) |
173d3adb | 219 | { |
42fddcc7 | 220 | if (!xsk_is_bound(xs)) |
2be4a677 | 221 | return -ENXIO; |
42fddcc7 | 222 | |
173d3adb BT |
223 | if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
224 | return -EINVAL; | |
225 | ||
b02e5a0e | 226 | sk_mark_napi_id_once_xdp(&xs->sk, xdp); |
458f7272 | 227 | return 0; |
173d3adb BT |
228 | } |
229 | ||
d817991c | 230 | static void xsk_flush(struct xdp_sock *xs) |
c497176c | 231 | { |
59e35e55 | 232 | xskq_prod_submit(xs->rx); |
7361f9c3 | 233 | __xskq_cons_release(xs->pool->fq); |
43a825af | 234 | sock_def_readable(&xs->sk); |
c497176c BT |
235 | } |
236 | ||
237 | int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) | |
238 | { | |
239 | int err; | |
240 | ||
bf0bdd13 | 241 | spin_lock_bh(&xs->rx_lock); |
458f7272 BT |
242 | err = xsk_rcv_check(xs, xdp); |
243 | if (!err) { | |
244 | err = __xsk_rcv(xs, xdp); | |
245 | xsk_flush(xs); | |
246 | } | |
bf0bdd13 | 247 | spin_unlock_bh(&xs->rx_lock); |
c497176c BT |
248 | return err; |
249 | } | |
250 | ||
458f7272 BT |
251 | static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
252 | { | |
253 | int err; | |
254 | u32 len; | |
255 | ||
256 | err = xsk_rcv_check(xs, xdp); | |
257 | if (err) | |
258 | return err; | |
259 | ||
260 | if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { | |
261 | len = xdp->data_end - xdp->data; | |
262 | return __xsk_rcv_zc(xs, xdp, len); | |
263 | } | |
264 | ||
265 | err = __xsk_rcv(xs, xdp); | |
266 | if (!err) | |
267 | xdp_return_buff(xdp); | |
268 | return err; | |
269 | } | |
270 | ||
e312b9e7 | 271 | int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
d817991c | 272 | { |
e312b9e7 | 273 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
274 | int err; |
275 | ||
458f7272 | 276 | err = xsk_rcv(xs, xdp); |
d817991c BT |
277 | if (err) |
278 | return err; | |
279 | ||
280 | if (!xs->flush_node.prev) | |
281 | list_add(&xs->flush_node, flush_list); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
e312b9e7 | 286 | void __xsk_map_flush(void) |
d817991c | 287 | { |
e312b9e7 | 288 | struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); |
d817991c BT |
289 | struct xdp_sock *xs, *tmp; |
290 | ||
291 | list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { | |
292 | xsk_flush(xs); | |
293 | __list_del_clearprev(&xs->flush_node); | |
294 | } | |
295 | } | |
296 | ||
c4655761 | 297 | void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries) |
ac98d8aa | 298 | { |
7361f9c3 | 299 | xskq_prod_submit_n(pool->cq, nb_entries); |
ac98d8aa | 300 | } |
c4655761 | 301 | EXPORT_SYMBOL(xsk_tx_completed); |
ac98d8aa | 302 | |
c4655761 | 303 | void xsk_tx_release(struct xsk_buff_pool *pool) |
ac98d8aa MK |
304 | { |
305 | struct xdp_sock *xs; | |
306 | ||
307 | rcu_read_lock(); | |
a5aa8e52 | 308 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
30744a68 | 309 | __xskq_cons_release(xs->tx); |
3413f041 XZ |
310 | if (xsk_tx_writeable(xs)) |
311 | xs->sk.sk_write_space(&xs->sk); | |
ac98d8aa MK |
312 | } |
313 | rcu_read_unlock(); | |
314 | } | |
c4655761 | 315 | EXPORT_SYMBOL(xsk_tx_release); |
ac98d8aa | 316 | |
c4655761 | 317 | bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) |
ac98d8aa | 318 | { |
ac98d8aa MK |
319 | struct xdp_sock *xs; |
320 | ||
321 | rcu_read_lock(); | |
a5aa8e52 | 322 | list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
1c1efc2a | 323 | if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { |
8aa5a335 | 324 | xs->tx->queue_empty_descs++; |
ac98d8aa | 325 | continue; |
8aa5a335 | 326 | } |
ac98d8aa | 327 | |
0a05861f | 328 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
329 | * Reserve space in the completion queue and only proceed |
330 | * if there is space in it. This avoids having to implement | |
331 | * any buffering in the Tx path. | |
332 | */ | |
7361f9c3 | 333 | if (xskq_prod_reserve_addr(pool->cq, desc->addr)) |
ac98d8aa MK |
334 | goto out; |
335 | ||
c5ed924b | 336 | xskq_cons_release(xs->tx); |
ac98d8aa MK |
337 | rcu_read_unlock(); |
338 | return true; | |
339 | } | |
340 | ||
341 | out: | |
342 | rcu_read_unlock(); | |
343 | return false; | |
344 | } | |
c4655761 | 345 | EXPORT_SYMBOL(xsk_tx_peek_desc); |
ac98d8aa | 346 | |
d1bc532e | 347 | static u32 xsk_tx_peek_release_fallback(struct xsk_buff_pool *pool, u32 max_entries) |
9349eb3a | 348 | { |
d1bc532e | 349 | struct xdp_desc *descs = pool->tx_descs; |
9349eb3a MK |
350 | u32 nb_pkts = 0; |
351 | ||
352 | while (nb_pkts < max_entries && xsk_tx_peek_desc(pool, &descs[nb_pkts])) | |
353 | nb_pkts++; | |
354 | ||
355 | xsk_tx_release(pool); | |
356 | return nb_pkts; | |
357 | } | |
358 | ||
c00c4461 | 359 | u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 nb_pkts) |
9349eb3a MK |
360 | { |
361 | struct xdp_sock *xs; | |
9349eb3a MK |
362 | |
363 | rcu_read_lock(); | |
364 | if (!list_is_singular(&pool->xsk_tx_list)) { | |
365 | /* Fallback to the non-batched version */ | |
366 | rcu_read_unlock(); | |
c00c4461 | 367 | return xsk_tx_peek_release_fallback(pool, nb_pkts); |
9349eb3a MK |
368 | } |
369 | ||
370 | xs = list_first_or_null_rcu(&pool->xsk_tx_list, struct xdp_sock, tx_list); | |
371 | if (!xs) { | |
372 | nb_pkts = 0; | |
373 | goto out; | |
374 | } | |
375 | ||
c00c4461 | 376 | nb_pkts = xskq_cons_nb_entries(xs->tx, nb_pkts); |
9349eb3a MK |
377 | |
378 | /* This is the backpressure mechanism for the Tx path. Try to | |
379 | * reserve space in the completion queue for all packets, but | |
380 | * if there are fewer slots available, just process that many | |
381 | * packets. This avoids having to implement any buffering in | |
382 | * the Tx path. | |
383 | */ | |
c00c4461 | 384 | nb_pkts = xskq_prod_nb_free(pool->cq, nb_pkts); |
9349eb3a MK |
385 | if (!nb_pkts) |
386 | goto out; | |
387 | ||
c00c4461 MF |
388 | nb_pkts = xskq_cons_read_desc_batch(xs->tx, pool, nb_pkts); |
389 | if (!nb_pkts) { | |
390 | xs->tx->queue_empty_descs++; | |
391 | goto out; | |
392 | } | |
393 | ||
9349eb3a | 394 | __xskq_cons_release(xs->tx); |
c00c4461 | 395 | xskq_prod_write_addr_batch(pool->cq, pool->tx_descs, nb_pkts); |
9349eb3a MK |
396 | xs->sk.sk_write_space(&xs->sk); |
397 | ||
398 | out: | |
399 | rcu_read_unlock(); | |
400 | return nb_pkts; | |
401 | } | |
402 | EXPORT_SYMBOL(xsk_tx_peek_release_desc_batch); | |
403 | ||
06870682 | 404 | static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
ac98d8aa | 405 | { |
ac98d8aa | 406 | struct net_device *dev = xs->dev; |
06870682 | 407 | |
18b1ab7a | 408 | return dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); |
ac98d8aa MK |
409 | } |
410 | ||
35fcde7f MK |
411 | static void xsk_destruct_skb(struct sk_buff *skb) |
412 | { | |
bbff2f32 | 413 | u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg; |
35fcde7f | 414 | struct xdp_sock *xs = xdp_sk(skb->sk); |
a9744f7c | 415 | unsigned long flags; |
35fcde7f | 416 | |
f09ced40 | 417 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
7361f9c3 | 418 | xskq_prod_submit_addr(xs->pool->cq, addr); |
f09ced40 | 419 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
35fcde7f MK |
420 | |
421 | sock_wfree(skb); | |
422 | } | |
423 | ||
9c8f21e6 XZ |
424 | static struct sk_buff *xsk_build_skb_zerocopy(struct xdp_sock *xs, |
425 | struct xdp_desc *desc) | |
426 | { | |
427 | struct xsk_buff_pool *pool = xs->pool; | |
428 | u32 hr, len, ts, offset, copy, copied; | |
429 | struct sk_buff *skb; | |
430 | struct page *page; | |
431 | void *buffer; | |
432 | int err, i; | |
433 | u64 addr; | |
434 | ||
435 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(xs->dev->needed_headroom)); | |
436 | ||
437 | skb = sock_alloc_send_skb(&xs->sk, hr, 1, &err); | |
438 | if (unlikely(!skb)) | |
439 | return ERR_PTR(err); | |
440 | ||
441 | skb_reserve(skb, hr); | |
442 | ||
443 | addr = desc->addr; | |
444 | len = desc->len; | |
445 | ts = pool->unaligned ? len : pool->chunk_size; | |
446 | ||
447 | buffer = xsk_buff_raw_get_data(pool, addr); | |
448 | offset = offset_in_page(buffer); | |
449 | addr = buffer - pool->addrs; | |
450 | ||
451 | for (copied = 0, i = 0; copied < len; i++) { | |
452 | page = pool->umem->pgs[addr >> PAGE_SHIFT]; | |
453 | get_page(page); | |
454 | ||
455 | copy = min_t(u32, PAGE_SIZE - offset, len - copied); | |
456 | skb_fill_page_desc(skb, i, page, offset, copy); | |
457 | ||
458 | copied += copy; | |
459 | addr += copy; | |
460 | offset = 0; | |
461 | } | |
462 | ||
463 | skb->len += len; | |
464 | skb->data_len += len; | |
465 | skb->truesize += ts; | |
466 | ||
467 | refcount_add(ts, &xs->sk.sk_wmem_alloc); | |
468 | ||
469 | return skb; | |
470 | } | |
471 | ||
472 | static struct sk_buff *xsk_build_skb(struct xdp_sock *xs, | |
473 | struct xdp_desc *desc) | |
474 | { | |
475 | struct net_device *dev = xs->dev; | |
476 | struct sk_buff *skb; | |
477 | ||
478 | if (dev->priv_flags & IFF_TX_SKB_NO_LINEAR) { | |
479 | skb = xsk_build_skb_zerocopy(xs, desc); | |
480 | if (IS_ERR(skb)) | |
481 | return skb; | |
482 | } else { | |
483 | u32 hr, tr, len; | |
484 | void *buffer; | |
485 | int err; | |
486 | ||
487 | hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(dev->needed_headroom)); | |
488 | tr = dev->needed_tailroom; | |
489 | len = desc->len; | |
490 | ||
491 | skb = sock_alloc_send_skb(&xs->sk, hr + len + tr, 1, &err); | |
492 | if (unlikely(!skb)) | |
493 | return ERR_PTR(err); | |
494 | ||
495 | skb_reserve(skb, hr); | |
496 | skb_put(skb, len); | |
497 | ||
498 | buffer = xsk_buff_raw_get_data(xs->pool, desc->addr); | |
499 | err = skb_store_bits(skb, 0, buffer, len); | |
500 | if (unlikely(err)) { | |
501 | kfree_skb(skb); | |
502 | return ERR_PTR(err); | |
503 | } | |
504 | } | |
505 | ||
506 | skb->dev = dev; | |
507 | skb->priority = xs->sk.sk_priority; | |
508 | skb->mark = xs->sk.sk_mark; | |
509 | skb_shinfo(skb)->destructor_arg = (void *)(long)desc->addr; | |
510 | skb->destructor = xsk_destruct_skb; | |
511 | ||
512 | return skb; | |
513 | } | |
514 | ||
1596dae2 | 515 | static int __xsk_generic_xmit(struct sock *sk) |
35fcde7f | 516 | { |
35fcde7f | 517 | struct xdp_sock *xs = xdp_sk(sk); |
df551058 | 518 | u32 max_batch = TX_BATCH_SIZE; |
35fcde7f MK |
519 | bool sent_frame = false; |
520 | struct xdp_desc desc; | |
521 | struct sk_buff *skb; | |
f09ced40 | 522 | unsigned long flags; |
35fcde7f MK |
523 | int err = 0; |
524 | ||
35fcde7f MK |
525 | mutex_lock(&xs->mutex); |
526 | ||
18b1ab7a MK |
527 | /* Since we dropped the RCU read lock, the socket state might have changed. */ |
528 | if (unlikely(!xsk_is_bound(xs))) { | |
529 | err = -ENXIO; | |
530 | goto out; | |
531 | } | |
532 | ||
67571640 IM |
533 | if (xs->queue_id >= xs->dev->real_num_tx_queues) |
534 | goto out; | |
535 | ||
1c1efc2a | 536 | while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
35fcde7f MK |
537 | if (max_batch-- == 0) { |
538 | err = -EAGAIN; | |
539 | goto out; | |
540 | } | |
541 | ||
0a05861f | 542 | /* This is the backpressure mechanism for the Tx path. |
15d8c916 MK |
543 | * Reserve space in the completion queue and only proceed |
544 | * if there is space in it. This avoids having to implement | |
545 | * any buffering in the Tx path. | |
546 | */ | |
f09ced40 | 547 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
9c8f21e6 | 548 | if (xskq_prod_reserve(xs->pool->cq)) { |
f09ced40 | 549 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
35fcde7f MK |
550 | goto out; |
551 | } | |
f09ced40 | 552 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
35fcde7f | 553 | |
a6e944f2 CL |
554 | skb = xsk_build_skb(xs, &desc); |
555 | if (IS_ERR(skb)) { | |
556 | err = PTR_ERR(skb); | |
557 | spin_lock_irqsave(&xs->pool->cq_lock, flags); | |
558 | xskq_prod_cancel(xs->pool->cq); | |
559 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
560 | goto out; | |
561 | } | |
562 | ||
36ccdf85 | 563 | err = __dev_direct_xmit(skb, xs->queue_id); |
642e450b MK |
564 | if (err == NETDEV_TX_BUSY) { |
565 | /* Tell user-space to retry the send */ | |
566 | skb->destructor = sock_wfree; | |
b1b95cb5 MK |
567 | spin_lock_irqsave(&xs->pool->cq_lock, flags); |
568 | xskq_prod_cancel(xs->pool->cq); | |
569 | spin_unlock_irqrestore(&xs->pool->cq_lock, flags); | |
642e450b MK |
570 | /* Free skb without triggering the perf drop trace */ |
571 | consume_skb(skb); | |
572 | err = -EAGAIN; | |
573 | goto out; | |
574 | } | |
575 | ||
c5ed924b | 576 | xskq_cons_release(xs->tx); |
35fcde7f | 577 | /* Ignore NET_XMIT_CN as packet might have been sent */ |
642e450b | 578 | if (err == NET_XMIT_DROP) { |
fe588685 MK |
579 | /* SKB completed but not sent */ |
580 | err = -EBUSY; | |
35fcde7f MK |
581 | goto out; |
582 | } | |
583 | ||
584 | sent_frame = true; | |
35fcde7f MK |
585 | } |
586 | ||
8aa5a335 CL |
587 | xs->tx->queue_empty_descs++; |
588 | ||
35fcde7f MK |
589 | out: |
590 | if (sent_frame) | |
3413f041 XZ |
591 | if (xsk_tx_writeable(xs)) |
592 | sk->sk_write_space(sk); | |
35fcde7f MK |
593 | |
594 | mutex_unlock(&xs->mutex); | |
595 | return err; | |
596 | } | |
597 | ||
1596dae2 | 598 | static int xsk_generic_xmit(struct sock *sk) |
df551058 | 599 | { |
18b1ab7a | 600 | int ret; |
df551058 | 601 | |
18b1ab7a MK |
602 | /* Drop the RCU lock since the SKB path might sleep. */ |
603 | rcu_read_unlock(); | |
1596dae2 | 604 | ret = __xsk_generic_xmit(sk); |
18b1ab7a MK |
605 | /* Reaquire RCU lock before going into common code. */ |
606 | rcu_read_lock(); | |
607 | ||
608 | return ret; | |
df551058 MK |
609 | } |
610 | ||
a0731952 BT |
611 | static bool xsk_no_wakeup(struct sock *sk) |
612 | { | |
613 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
614 | /* Prefer busy-polling, skip the wakeup. */ | |
615 | return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) && | |
616 | READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID; | |
617 | #else | |
618 | return false; | |
619 | #endif | |
620 | } | |
621 | ||
1596dae2 MF |
622 | static int xsk_check_common(struct xdp_sock *xs) |
623 | { | |
624 | if (unlikely(!xsk_is_bound(xs))) | |
625 | return -ENXIO; | |
626 | if (unlikely(!(xs->dev->flags & IFF_UP))) | |
627 | return -ENETDOWN; | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
18b1ab7a | 632 | static int __xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
35fcde7f | 633 | { |
ac98d8aa | 634 | bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
35fcde7f MK |
635 | struct sock *sk = sock->sk; |
636 | struct xdp_sock *xs = xdp_sk(sk); | |
e3920818 | 637 | struct xsk_buff_pool *pool; |
1596dae2 | 638 | int err; |
35fcde7f | 639 | |
1596dae2 MF |
640 | err = xsk_check_common(xs); |
641 | if (err) | |
642 | return err; | |
df551058 | 643 | if (unlikely(need_wait)) |
ac98d8aa | 644 | return -EOPNOTSUPP; |
1596dae2 MF |
645 | if (unlikely(!xs->tx)) |
646 | return -ENOBUFS; | |
35fcde7f | 647 | |
ca2e1a62 MF |
648 | if (sk_can_busy_loop(sk)) { |
649 | if (xs->zc) | |
650 | __sk_mark_napi_id_once(sk, xsk_pool_get_napi_id(xs->pool)); | |
a0731952 | 651 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ |
ca2e1a62 | 652 | } |
a0731952 | 653 | |
8de8b71b | 654 | if (xs->zc && xsk_no_wakeup(sk)) |
a0731952 BT |
655 | return 0; |
656 | ||
e3920818 | 657 | pool = xs->pool; |
1596dae2 MF |
658 | if (pool->cached_need_wakeup & XDP_WAKEUP_TX) { |
659 | if (xs->zc) | |
660 | return xsk_wakeup(xs, XDP_WAKEUP_TX); | |
661 | return xsk_generic_xmit(sk); | |
662 | } | |
e3920818 | 663 | return 0; |
35fcde7f MK |
664 | } |
665 | ||
18b1ab7a MK |
666 | static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
667 | { | |
668 | int ret; | |
669 | ||
670 | rcu_read_lock(); | |
671 | ret = __xsk_sendmsg(sock, m, total_len); | |
672 | rcu_read_unlock(); | |
673 | ||
674 | return ret; | |
675 | } | |
676 | ||
677 | static int __xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) | |
45a86681 BT |
678 | { |
679 | bool need_wait = !(flags & MSG_DONTWAIT); | |
680 | struct sock *sk = sock->sk; | |
681 | struct xdp_sock *xs = xdp_sk(sk); | |
1596dae2 | 682 | int err; |
45a86681 | 683 | |
1596dae2 MF |
684 | err = xsk_check_common(xs); |
685 | if (err) | |
686 | return err; | |
45a86681 BT |
687 | if (unlikely(!xs->rx)) |
688 | return -ENOBUFS; | |
45a86681 BT |
689 | if (unlikely(need_wait)) |
690 | return -EOPNOTSUPP; | |
691 | ||
a0731952 BT |
692 | if (sk_can_busy_loop(sk)) |
693 | sk_busy_loop(sk, 1); /* only support non-blocking sockets */ | |
694 | ||
695 | if (xsk_no_wakeup(sk)) | |
696 | return 0; | |
697 | ||
45a86681 BT |
698 | if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc) |
699 | return xsk_wakeup(xs, XDP_WAKEUP_RX); | |
700 | return 0; | |
35fcde7f MK |
701 | } |
702 | ||
18b1ab7a MK |
703 | static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) |
704 | { | |
705 | int ret; | |
706 | ||
707 | rcu_read_lock(); | |
708 | ret = __xsk_recvmsg(sock, m, len, flags); | |
709 | rcu_read_unlock(); | |
710 | ||
711 | return ret; | |
712 | } | |
713 | ||
5d946c5a | 714 | static __poll_t xsk_poll(struct file *file, struct socket *sock, |
a11e1d43 | 715 | struct poll_table_struct *wait) |
c497176c | 716 | { |
f5da5418 | 717 | __poll_t mask = 0; |
df551058 MK |
718 | struct sock *sk = sock->sk; |
719 | struct xdp_sock *xs = xdp_sk(sk); | |
c2d3d6a4 | 720 | struct xsk_buff_pool *pool; |
42fddcc7 | 721 | |
0706a78f MK |
722 | sock_poll_wait(file, sock, wait); |
723 | ||
18b1ab7a | 724 | rcu_read_lock(); |
1596dae2 MF |
725 | if (xsk_check_common(xs)) |
726 | goto skip_tx; | |
42fddcc7 | 727 | |
c2d3d6a4 | 728 | pool = xs->pool; |
77cd0d7b | 729 | |
c2d3d6a4 | 730 | if (pool->cached_need_wakeup) { |
06870682 | 731 | if (xs->zc) |
c2d3d6a4 | 732 | xsk_wakeup(xs, pool->cached_need_wakeup); |
1596dae2 | 733 | else if (xs->tx) |
df551058 | 734 | /* Poll needs to drive Tx also in copy mode */ |
1596dae2 | 735 | xsk_generic_xmit(sk); |
df551058 | 736 | } |
c497176c | 737 | |
1596dae2 | 738 | skip_tx: |
59e35e55 | 739 | if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
5d946c5a | 740 | mask |= EPOLLIN | EPOLLRDNORM; |
3413f041 | 741 | if (xs->tx && xsk_tx_writeable(xs)) |
5d946c5a | 742 | mask |= EPOLLOUT | EPOLLWRNORM; |
c497176c | 743 | |
18b1ab7a | 744 | rcu_read_unlock(); |
c497176c BT |
745 | return mask; |
746 | } | |
747 | ||
b9b6b68e BT |
748 | static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
749 | bool umem_queue) | |
423f3832 MK |
750 | { |
751 | struct xsk_queue *q; | |
752 | ||
753 | if (entries == 0 || *queue || !is_power_of_2(entries)) | |
754 | return -EINVAL; | |
755 | ||
b9b6b68e | 756 | q = xskq_create(entries, umem_queue); |
423f3832 MK |
757 | if (!q) |
758 | return -ENOMEM; | |
759 | ||
37b07693 BT |
760 | /* Make sure queue is ready before it can be seen by others */ |
761 | smp_wmb(); | |
94a99763 | 762 | WRITE_ONCE(*queue, q); |
423f3832 MK |
763 | return 0; |
764 | } | |
765 | ||
455302d1 IM |
766 | static void xsk_unbind_dev(struct xdp_sock *xs) |
767 | { | |
768 | struct net_device *dev = xs->dev; | |
769 | ||
42fddcc7 | 770 | if (xs->state != XSK_BOUND) |
455302d1 | 771 | return; |
42fddcc7 | 772 | WRITE_ONCE(xs->state, XSK_UNBOUND); |
455302d1 IM |
773 | |
774 | /* Wait for driver to stop using the xdp socket. */ | |
a5aa8e52 | 775 | xp_del_xsk(xs->pool, xs); |
455302d1 IM |
776 | synchronize_net(); |
777 | dev_put(dev); | |
778 | } | |
779 | ||
0402acd6 | 780 | static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
782347b6 | 781 | struct xdp_sock __rcu ***map_entry) |
0402acd6 BT |
782 | { |
783 | struct xsk_map *map = NULL; | |
784 | struct xsk_map_node *node; | |
785 | ||
786 | *map_entry = NULL; | |
787 | ||
788 | spin_lock_bh(&xs->map_list_lock); | |
789 | node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, | |
790 | node); | |
791 | if (node) { | |
bb1b25ca | 792 | bpf_map_inc(&node->map->map); |
0402acd6 BT |
793 | map = node->map; |
794 | *map_entry = node->map_entry; | |
795 | } | |
796 | spin_unlock_bh(&xs->map_list_lock); | |
797 | return map; | |
798 | } | |
799 | ||
800 | static void xsk_delete_from_maps(struct xdp_sock *xs) | |
801 | { | |
802 | /* This function removes the current XDP socket from all the | |
803 | * maps it resides in. We need to take extra care here, due to | |
804 | * the two locks involved. Each map has a lock synchronizing | |
805 | * updates to the entries, and each socket has a lock that | |
806 | * synchronizes access to the list of maps (map_list). For | |
807 | * deadlock avoidance the locks need to be taken in the order | |
808 | * "map lock"->"socket map list lock". We start off by | |
809 | * accessing the socket map list, and take a reference to the | |
810 | * map to guarantee existence between the | |
811 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete() | |
812 | * calls. Then we ask the map to remove the socket, which | |
813 | * tries to remove the socket from the map. Note that there | |
814 | * might be updates to the map between | |
815 | * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). | |
816 | */ | |
782347b6 | 817 | struct xdp_sock __rcu **map_entry = NULL; |
0402acd6 BT |
818 | struct xsk_map *map; |
819 | ||
820 | while ((map = xsk_get_map_list_entry(xs, &map_entry))) { | |
821 | xsk_map_try_sock_delete(map, xs, map_entry); | |
bb1b25ca | 822 | bpf_map_put(&map->map); |
0402acd6 BT |
823 | } |
824 | } | |
825 | ||
c0c77d8f BT |
826 | static int xsk_release(struct socket *sock) |
827 | { | |
828 | struct sock *sk = sock->sk; | |
965a9909 | 829 | struct xdp_sock *xs = xdp_sk(sk); |
c0c77d8f BT |
830 | struct net *net; |
831 | ||
832 | if (!sk) | |
833 | return 0; | |
834 | ||
835 | net = sock_net(sk); | |
836 | ||
1d0dc069 BT |
837 | mutex_lock(&net->xdp.lock); |
838 | sk_del_node_init_rcu(sk); | |
839 | mutex_unlock(&net->xdp.lock); | |
840 | ||
c0c77d8f | 841 | sock_prot_inuse_add(net, sk->sk_prot, -1); |
c0c77d8f | 842 | |
0402acd6 | 843 | xsk_delete_from_maps(xs); |
42fddcc7 | 844 | mutex_lock(&xs->mutex); |
455302d1 | 845 | xsk_unbind_dev(xs); |
42fddcc7 | 846 | mutex_unlock(&xs->mutex); |
965a9909 | 847 | |
541d7fdd BT |
848 | xskq_destroy(xs->rx); |
849 | xskq_destroy(xs->tx); | |
7361f9c3 MK |
850 | xskq_destroy(xs->fq_tmp); |
851 | xskq_destroy(xs->cq_tmp); | |
541d7fdd | 852 | |
c0c77d8f BT |
853 | sock_orphan(sk); |
854 | sock->sk = NULL; | |
855 | ||
c0c77d8f BT |
856 | sock_put(sk); |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
965a9909 MK |
861 | static struct socket *xsk_lookup_xsk_from_fd(int fd) |
862 | { | |
863 | struct socket *sock; | |
864 | int err; | |
865 | ||
866 | sock = sockfd_lookup(fd, &err); | |
867 | if (!sock) | |
868 | return ERR_PTR(-ENOTSOCK); | |
869 | ||
870 | if (sock->sk->sk_family != PF_XDP) { | |
871 | sockfd_put(sock); | |
872 | return ERR_PTR(-ENOPROTOOPT); | |
873 | } | |
874 | ||
875 | return sock; | |
876 | } | |
877 | ||
7361f9c3 MK |
878 | static bool xsk_validate_queues(struct xdp_sock *xs) |
879 | { | |
880 | return xs->fq_tmp && xs->cq_tmp; | |
881 | } | |
882 | ||
965a9909 MK |
883 | static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
884 | { | |
885 | struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; | |
886 | struct sock *sk = sock->sk; | |
965a9909 | 887 | struct xdp_sock *xs = xdp_sk(sk); |
959b71db | 888 | struct net_device *dev; |
173d3adb | 889 | u32 flags, qid; |
965a9909 MK |
890 | int err = 0; |
891 | ||
892 | if (addr_len < sizeof(struct sockaddr_xdp)) | |
893 | return -EINVAL; | |
894 | if (sxdp->sxdp_family != AF_XDP) | |
895 | return -EINVAL; | |
896 | ||
f54ba391 | 897 | flags = sxdp->sxdp_flags; |
77cd0d7b MK |
898 | if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
899 | XDP_USE_NEED_WAKEUP)) | |
f54ba391 BT |
900 | return -EINVAL; |
901 | ||
5464c3a0 | 902 | rtnl_lock(); |
965a9909 | 903 | mutex_lock(&xs->mutex); |
455302d1 | 904 | if (xs->state != XSK_READY) { |
959b71db BT |
905 | err = -EBUSY; |
906 | goto out_release; | |
907 | } | |
908 | ||
965a9909 MK |
909 | dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
910 | if (!dev) { | |
911 | err = -ENODEV; | |
912 | goto out_release; | |
913 | } | |
914 | ||
f6145903 | 915 | if (!xs->rx && !xs->tx) { |
965a9909 MK |
916 | err = -EINVAL; |
917 | goto out_unlock; | |
918 | } | |
919 | ||
173d3adb | 920 | qid = sxdp->sxdp_queue_id; |
173d3adb BT |
921 | |
922 | if (flags & XDP_SHARED_UMEM) { | |
965a9909 MK |
923 | struct xdp_sock *umem_xs; |
924 | struct socket *sock; | |
925 | ||
77cd0d7b MK |
926 | if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
927 | (flags & XDP_USE_NEED_WAKEUP)) { | |
173d3adb BT |
928 | /* Cannot specify flags for shared sockets. */ |
929 | err = -EINVAL; | |
930 | goto out_unlock; | |
931 | } | |
932 | ||
965a9909 MK |
933 | if (xs->umem) { |
934 | /* We have already our own. */ | |
935 | err = -EINVAL; | |
936 | goto out_unlock; | |
937 | } | |
938 | ||
939 | sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); | |
940 | if (IS_ERR(sock)) { | |
941 | err = PTR_ERR(sock); | |
942 | goto out_unlock; | |
943 | } | |
944 | ||
945 | umem_xs = xdp_sk(sock->sk); | |
42fddcc7 | 946 | if (!xsk_is_bound(umem_xs)) { |
965a9909 MK |
947 | err = -EBADF; |
948 | sockfd_put(sock); | |
949 | goto out_unlock; | |
42fddcc7 | 950 | } |
965a9909 | 951 | |
a1132430 MK |
952 | if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
953 | /* Share the umem with another socket on another qid | |
954 | * and/or device. | |
955 | */ | |
b5aea28d MK |
956 | xs->pool = xp_create_and_assign_umem(xs, |
957 | umem_xs->umem); | |
958 | if (!xs->pool) { | |
1fd17c8c | 959 | err = -ENOMEM; |
b5aea28d MK |
960 | sockfd_put(sock); |
961 | goto out_unlock; | |
962 | } | |
963 | ||
60240bc2 JM |
964 | err = xp_assign_dev_shared(xs->pool, umem_xs, dev, |
965 | qid); | |
b5aea28d MK |
966 | if (err) { |
967 | xp_destroy(xs->pool); | |
83cf5c68 | 968 | xs->pool = NULL; |
b5aea28d MK |
969 | sockfd_put(sock); |
970 | goto out_unlock; | |
971 | } | |
972 | } else { | |
973 | /* Share the buffer pool with the other socket. */ | |
974 | if (xs->fq_tmp || xs->cq_tmp) { | |
975 | /* Do not allow setting your own fq or cq. */ | |
976 | err = -EINVAL; | |
977 | sockfd_put(sock); | |
978 | goto out_unlock; | |
979 | } | |
980 | ||
981 | xp_get_pool(umem_xs->pool); | |
982 | xs->pool = umem_xs->pool; | |
ba3beec2 MF |
983 | |
984 | /* If underlying shared umem was created without Tx | |
985 | * ring, allocate Tx descs array that Tx batching API | |
986 | * utilizes | |
987 | */ | |
988 | if (xs->tx && !xs->pool->tx_descs) { | |
989 | err = xp_alloc_tx_descs(xs->pool, xs); | |
990 | if (err) { | |
991 | xp_put_pool(xs->pool); | |
992 | sockfd_put(sock); | |
993 | goto out_unlock; | |
994 | } | |
995 | } | |
b5aea28d MK |
996 | } |
997 | ||
965a9909 | 998 | xdp_get_umem(umem_xs->umem); |
9764f4b3 | 999 | WRITE_ONCE(xs->umem, umem_xs->umem); |
965a9909 | 1000 | sockfd_put(sock); |
7361f9c3 | 1001 | } else if (!xs->umem || !xsk_validate_queues(xs)) { |
965a9909 MK |
1002 | err = -EINVAL; |
1003 | goto out_unlock; | |
c497176c BT |
1004 | } else { |
1005 | /* This xsk has its own umem. */ | |
1c1efc2a MK |
1006 | xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
1007 | if (!xs->pool) { | |
1008 | err = -ENOMEM; | |
173d3adb | 1009 | goto out_unlock; |
1c1efc2a MK |
1010 | } |
1011 | ||
1012 | err = xp_assign_dev(xs->pool, dev, qid, flags); | |
1013 | if (err) { | |
1014 | xp_destroy(xs->pool); | |
1015 | xs->pool = NULL; | |
1c1efc2a MK |
1016 | goto out_unlock; |
1017 | } | |
965a9909 MK |
1018 | } |
1019 | ||
8bee6833 MK |
1020 | /* FQ and CQ are now owned by the buffer pool and cleaned up with it. */ |
1021 | xs->fq_tmp = NULL; | |
1022 | xs->cq_tmp = NULL; | |
1023 | ||
965a9909 | 1024 | xs->dev = dev; |
ac98d8aa MK |
1025 | xs->zc = xs->umem->zc; |
1026 | xs->queue_id = qid; | |
a5aa8e52 | 1027 | xp_add_xsk(xs->pool, xs); |
965a9909 MK |
1028 | |
1029 | out_unlock: | |
42fddcc7 | 1030 | if (err) { |
965a9909 | 1031 | dev_put(dev); |
42fddcc7 BT |
1032 | } else { |
1033 | /* Matches smp_rmb() in bind() for shared umem | |
1034 | * sockets, and xsk_is_bound(). | |
1035 | */ | |
1036 | smp_wmb(); | |
1037 | WRITE_ONCE(xs->state, XSK_BOUND); | |
1038 | } | |
965a9909 MK |
1039 | out_release: |
1040 | mutex_unlock(&xs->mutex); | |
5464c3a0 | 1041 | rtnl_unlock(); |
965a9909 MK |
1042 | return err; |
1043 | } | |
1044 | ||
c05cd364 KL |
1045 | struct xdp_umem_reg_v1 { |
1046 | __u64 addr; /* Start of packet data area */ | |
1047 | __u64 len; /* Length of packet data area */ | |
1048 | __u32 chunk_size; | |
1049 | __u32 headroom; | |
1050 | }; | |
1051 | ||
c0c77d8f | 1052 | static int xsk_setsockopt(struct socket *sock, int level, int optname, |
a7b75c5a | 1053 | sockptr_t optval, unsigned int optlen) |
c0c77d8f BT |
1054 | { |
1055 | struct sock *sk = sock->sk; | |
1056 | struct xdp_sock *xs = xdp_sk(sk); | |
1057 | int err; | |
1058 | ||
1059 | if (level != SOL_XDP) | |
1060 | return -ENOPROTOOPT; | |
1061 | ||
1062 | switch (optname) { | |
b9b6b68e | 1063 | case XDP_RX_RING: |
f6145903 | 1064 | case XDP_TX_RING: |
b9b6b68e BT |
1065 | { |
1066 | struct xsk_queue **q; | |
1067 | int entries; | |
1068 | ||
1069 | if (optlen < sizeof(entries)) | |
1070 | return -EINVAL; | |
a7b75c5a | 1071 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
b9b6b68e BT |
1072 | return -EFAULT; |
1073 | ||
1074 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1075 | if (xs->state != XSK_READY) { |
1076 | mutex_unlock(&xs->mutex); | |
1077 | return -EBUSY; | |
1078 | } | |
f6145903 | 1079 | q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
b9b6b68e | 1080 | err = xsk_init_queue(entries, q, false); |
77cd0d7b MK |
1081 | if (!err && optname == XDP_TX_RING) |
1082 | /* Tx needs to be explicitly woken up the first time */ | |
1083 | xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; | |
b9b6b68e BT |
1084 | mutex_unlock(&xs->mutex); |
1085 | return err; | |
1086 | } | |
c0c77d8f BT |
1087 | case XDP_UMEM_REG: |
1088 | { | |
c05cd364 KL |
1089 | size_t mr_size = sizeof(struct xdp_umem_reg); |
1090 | struct xdp_umem_reg mr = {}; | |
c0c77d8f BT |
1091 | struct xdp_umem *umem; |
1092 | ||
c05cd364 KL |
1093 | if (optlen < sizeof(struct xdp_umem_reg_v1)) |
1094 | return -EINVAL; | |
1095 | else if (optlen < sizeof(mr)) | |
1096 | mr_size = sizeof(struct xdp_umem_reg_v1); | |
1097 | ||
a7b75c5a | 1098 | if (copy_from_sockptr(&mr, optval, mr_size)) |
c0c77d8f BT |
1099 | return -EFAULT; |
1100 | ||
1101 | mutex_lock(&xs->mutex); | |
455302d1 | 1102 | if (xs->state != XSK_READY || xs->umem) { |
a49049ea BT |
1103 | mutex_unlock(&xs->mutex); |
1104 | return -EBUSY; | |
1105 | } | |
c0c77d8f | 1106 | |
a49049ea BT |
1107 | umem = xdp_umem_create(&mr); |
1108 | if (IS_ERR(umem)) { | |
c0c77d8f | 1109 | mutex_unlock(&xs->mutex); |
a49049ea | 1110 | return PTR_ERR(umem); |
c0c77d8f BT |
1111 | } |
1112 | ||
1113 | /* Make sure umem is ready before it can be seen by others */ | |
1114 | smp_wmb(); | |
9764f4b3 | 1115 | WRITE_ONCE(xs->umem, umem); |
c0c77d8f BT |
1116 | mutex_unlock(&xs->mutex); |
1117 | return 0; | |
1118 | } | |
423f3832 | 1119 | case XDP_UMEM_FILL_RING: |
fe230832 | 1120 | case XDP_UMEM_COMPLETION_RING: |
423f3832 MK |
1121 | { |
1122 | struct xsk_queue **q; | |
1123 | int entries; | |
1124 | ||
a7b75c5a | 1125 | if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
423f3832 MK |
1126 | return -EFAULT; |
1127 | ||
1128 | mutex_lock(&xs->mutex); | |
455302d1 IM |
1129 | if (xs->state != XSK_READY) { |
1130 | mutex_unlock(&xs->mutex); | |
1131 | return -EBUSY; | |
1132 | } | |
a49049ea | 1133 | |
7361f9c3 MK |
1134 | q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
1135 | &xs->cq_tmp; | |
b9b6b68e | 1136 | err = xsk_init_queue(entries, q, true); |
423f3832 MK |
1137 | mutex_unlock(&xs->mutex); |
1138 | return err; | |
1139 | } | |
c0c77d8f BT |
1140 | default: |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | return -ENOPROTOOPT; | |
1145 | } | |
1146 | ||
77cd0d7b MK |
1147 | static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
1148 | { | |
1149 | ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); | |
1150 | ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); | |
1151 | ring->desc = offsetof(struct xdp_rxtx_ring, desc); | |
1152 | } | |
1153 | ||
1154 | static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) | |
1155 | { | |
1156 | ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); | |
1157 | ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); | |
1158 | ring->desc = offsetof(struct xdp_umem_ring, desc); | |
1159 | } | |
1160 | ||
8aa5a335 CL |
1161 | struct xdp_statistics_v1 { |
1162 | __u64 rx_dropped; | |
1163 | __u64 rx_invalid_descs; | |
1164 | __u64 tx_invalid_descs; | |
1165 | }; | |
1166 | ||
af75d9e0 MK |
1167 | static int xsk_getsockopt(struct socket *sock, int level, int optname, |
1168 | char __user *optval, int __user *optlen) | |
1169 | { | |
1170 | struct sock *sk = sock->sk; | |
1171 | struct xdp_sock *xs = xdp_sk(sk); | |
1172 | int len; | |
1173 | ||
1174 | if (level != SOL_XDP) | |
1175 | return -ENOPROTOOPT; | |
1176 | ||
1177 | if (get_user(len, optlen)) | |
1178 | return -EFAULT; | |
1179 | if (len < 0) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | switch (optname) { | |
1183 | case XDP_STATISTICS: | |
1184 | { | |
3c4f850e | 1185 | struct xdp_statistics stats = {}; |
8aa5a335 CL |
1186 | bool extra_stats = true; |
1187 | size_t stats_size; | |
af75d9e0 | 1188 | |
8aa5a335 | 1189 | if (len < sizeof(struct xdp_statistics_v1)) { |
af75d9e0 | 1190 | return -EINVAL; |
8aa5a335 CL |
1191 | } else if (len < sizeof(stats)) { |
1192 | extra_stats = false; | |
1193 | stats_size = sizeof(struct xdp_statistics_v1); | |
1194 | } else { | |
1195 | stats_size = sizeof(stats); | |
1196 | } | |
af75d9e0 MK |
1197 | |
1198 | mutex_lock(&xs->mutex); | |
1199 | stats.rx_dropped = xs->rx_dropped; | |
8aa5a335 CL |
1200 | if (extra_stats) { |
1201 | stats.rx_ring_full = xs->rx_queue_full; | |
1202 | stats.rx_fill_ring_empty_descs = | |
7361f9c3 | 1203 | xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
8aa5a335 CL |
1204 | stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
1205 | } else { | |
1206 | stats.rx_dropped += xs->rx_queue_full; | |
1207 | } | |
af75d9e0 MK |
1208 | stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
1209 | stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); | |
1210 | mutex_unlock(&xs->mutex); | |
1211 | ||
8aa5a335 | 1212 | if (copy_to_user(optval, &stats, stats_size)) |
af75d9e0 | 1213 | return -EFAULT; |
8aa5a335 | 1214 | if (put_user(stats_size, optlen)) |
af75d9e0 MK |
1215 | return -EFAULT; |
1216 | ||
1217 | return 0; | |
1218 | } | |
b3a9e0be BT |
1219 | case XDP_MMAP_OFFSETS: |
1220 | { | |
1221 | struct xdp_mmap_offsets off; | |
77cd0d7b MK |
1222 | struct xdp_mmap_offsets_v1 off_v1; |
1223 | bool flags_supported = true; | |
1224 | void *to_copy; | |
b3a9e0be | 1225 | |
77cd0d7b | 1226 | if (len < sizeof(off_v1)) |
b3a9e0be | 1227 | return -EINVAL; |
77cd0d7b MK |
1228 | else if (len < sizeof(off)) |
1229 | flags_supported = false; | |
1230 | ||
1231 | if (flags_supported) { | |
1232 | /* xdp_ring_offset is identical to xdp_ring_offset_v1 | |
1233 | * except for the flags field added to the end. | |
1234 | */ | |
1235 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1236 | &off.rx); | |
1237 | xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) | |
1238 | &off.tx); | |
1239 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1240 | &off.fr); | |
1241 | xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) | |
1242 | &off.cr); | |
1243 | off.rx.flags = offsetof(struct xdp_rxtx_ring, | |
1244 | ptrs.flags); | |
1245 | off.tx.flags = offsetof(struct xdp_rxtx_ring, | |
1246 | ptrs.flags); | |
1247 | off.fr.flags = offsetof(struct xdp_umem_ring, | |
1248 | ptrs.flags); | |
1249 | off.cr.flags = offsetof(struct xdp_umem_ring, | |
1250 | ptrs.flags); | |
1251 | ||
1252 | len = sizeof(off); | |
1253 | to_copy = &off; | |
1254 | } else { | |
1255 | xsk_enter_rxtx_offsets(&off_v1.rx); | |
1256 | xsk_enter_rxtx_offsets(&off_v1.tx); | |
1257 | xsk_enter_umem_offsets(&off_v1.fr); | |
1258 | xsk_enter_umem_offsets(&off_v1.cr); | |
1259 | ||
1260 | len = sizeof(off_v1); | |
1261 | to_copy = &off_v1; | |
1262 | } | |
b3a9e0be | 1263 | |
77cd0d7b | 1264 | if (copy_to_user(optval, to_copy, len)) |
b3a9e0be BT |
1265 | return -EFAULT; |
1266 | if (put_user(len, optlen)) | |
1267 | return -EFAULT; | |
1268 | ||
1269 | return 0; | |
1270 | } | |
2640d3c8 MM |
1271 | case XDP_OPTIONS: |
1272 | { | |
1273 | struct xdp_options opts = {}; | |
1274 | ||
1275 | if (len < sizeof(opts)) | |
1276 | return -EINVAL; | |
1277 | ||
1278 | mutex_lock(&xs->mutex); | |
1279 | if (xs->zc) | |
1280 | opts.flags |= XDP_OPTIONS_ZEROCOPY; | |
1281 | mutex_unlock(&xs->mutex); | |
1282 | ||
1283 | len = sizeof(opts); | |
1284 | if (copy_to_user(optval, &opts, len)) | |
1285 | return -EFAULT; | |
1286 | if (put_user(len, optlen)) | |
1287 | return -EFAULT; | |
1288 | ||
1289 | return 0; | |
1290 | } | |
af75d9e0 MK |
1291 | default: |
1292 | break; | |
1293 | } | |
1294 | ||
1295 | return -EOPNOTSUPP; | |
1296 | } | |
1297 | ||
423f3832 MK |
1298 | static int xsk_mmap(struct file *file, struct socket *sock, |
1299 | struct vm_area_struct *vma) | |
1300 | { | |
a5a16e43 | 1301 | loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
423f3832 MK |
1302 | unsigned long size = vma->vm_end - vma->vm_start; |
1303 | struct xdp_sock *xs = xdp_sk(sock->sk); | |
5f5a7d8d | 1304 | int state = READ_ONCE(xs->state); |
423f3832 | 1305 | struct xsk_queue *q = NULL; |
423f3832 | 1306 | |
5f5a7d8d | 1307 | if (state != XSK_READY && state != XSK_BOUND) |
455302d1 IM |
1308 | return -EBUSY; |
1309 | ||
b9b6b68e | 1310 | if (offset == XDP_PGOFF_RX_RING) { |
37b07693 | 1311 | q = READ_ONCE(xs->rx); |
f6145903 | 1312 | } else if (offset == XDP_PGOFF_TX_RING) { |
37b07693 | 1313 | q = READ_ONCE(xs->tx); |
b9b6b68e | 1314 | } else { |
e6762c8b MK |
1315 | /* Matches the smp_wmb() in XDP_UMEM_REG */ |
1316 | smp_rmb(); | |
b9b6b68e | 1317 | if (offset == XDP_UMEM_PGOFF_FILL_RING) |
5f5a7d8d NG |
1318 | q = state == XSK_READY ? READ_ONCE(xs->fq_tmp) : |
1319 | READ_ONCE(xs->pool->fq); | |
fe230832 | 1320 | else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
5f5a7d8d NG |
1321 | q = state == XSK_READY ? READ_ONCE(xs->cq_tmp) : |
1322 | READ_ONCE(xs->pool->cq); | |
b9b6b68e | 1323 | } |
423f3832 MK |
1324 | |
1325 | if (!q) | |
1326 | return -EINVAL; | |
1327 | ||
e6762c8b MK |
1328 | /* Matches the smp_wmb() in xsk_init_queue */ |
1329 | smp_rmb(); | |
9f78bf33 | 1330 | if (size > q->ring_vmalloc_size) |
423f3832 MK |
1331 | return -EINVAL; |
1332 | ||
9f78bf33 | 1333 | return remap_vmalloc_range(vma, q->ring, 0); |
423f3832 MK |
1334 | } |
1335 | ||
455302d1 IM |
1336 | static int xsk_notifier(struct notifier_block *this, |
1337 | unsigned long msg, void *ptr) | |
1338 | { | |
1339 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1340 | struct net *net = dev_net(dev); | |
1341 | struct sock *sk; | |
1342 | ||
1343 | switch (msg) { | |
1344 | case NETDEV_UNREGISTER: | |
1345 | mutex_lock(&net->xdp.lock); | |
1346 | sk_for_each(sk, &net->xdp.list) { | |
1347 | struct xdp_sock *xs = xdp_sk(sk); | |
1348 | ||
1349 | mutex_lock(&xs->mutex); | |
1350 | if (xs->dev == dev) { | |
1351 | sk->sk_err = ENETDOWN; | |
1352 | if (!sock_flag(sk, SOCK_DEAD)) | |
e3ae2365 | 1353 | sk_error_report(sk); |
455302d1 IM |
1354 | |
1355 | xsk_unbind_dev(xs); | |
1356 | ||
1c1efc2a MK |
1357 | /* Clear device references. */ |
1358 | xp_clear_dev(xs->pool); | |
455302d1 IM |
1359 | } |
1360 | mutex_unlock(&xs->mutex); | |
1361 | } | |
1362 | mutex_unlock(&net->xdp.lock); | |
1363 | break; | |
1364 | } | |
1365 | return NOTIFY_DONE; | |
1366 | } | |
1367 | ||
c0c77d8f BT |
1368 | static struct proto xsk_proto = { |
1369 | .name = "XDP", | |
1370 | .owner = THIS_MODULE, | |
1371 | .obj_size = sizeof(struct xdp_sock), | |
1372 | }; | |
1373 | ||
1374 | static const struct proto_ops xsk_proto_ops = { | |
c2f4374b BT |
1375 | .family = PF_XDP, |
1376 | .owner = THIS_MODULE, | |
1377 | .release = xsk_release, | |
1378 | .bind = xsk_bind, | |
1379 | .connect = sock_no_connect, | |
1380 | .socketpair = sock_no_socketpair, | |
1381 | .accept = sock_no_accept, | |
1382 | .getname = sock_no_getname, | |
a11e1d43 | 1383 | .poll = xsk_poll, |
c2f4374b BT |
1384 | .ioctl = sock_no_ioctl, |
1385 | .listen = sock_no_listen, | |
1386 | .shutdown = sock_no_shutdown, | |
1387 | .setsockopt = xsk_setsockopt, | |
1388 | .getsockopt = xsk_getsockopt, | |
1389 | .sendmsg = xsk_sendmsg, | |
45a86681 | 1390 | .recvmsg = xsk_recvmsg, |
c2f4374b BT |
1391 | .mmap = xsk_mmap, |
1392 | .sendpage = sock_no_sendpage, | |
c0c77d8f BT |
1393 | }; |
1394 | ||
11fe9262 BT |
1395 | static void xsk_destruct(struct sock *sk) |
1396 | { | |
1397 | struct xdp_sock *xs = xdp_sk(sk); | |
1398 | ||
1399 | if (!sock_flag(sk, SOCK_DEAD)) | |
1400 | return; | |
1401 | ||
e5e1a4bc | 1402 | if (!xp_put_pool(xs->pool)) |
537cf4e3 | 1403 | xdp_put_umem(xs->umem, !xs->pool); |
11fe9262 BT |
1404 | } |
1405 | ||
c0c77d8f BT |
1406 | static int xsk_create(struct net *net, struct socket *sock, int protocol, |
1407 | int kern) | |
1408 | { | |
c0c77d8f | 1409 | struct xdp_sock *xs; |
1c1efc2a | 1410 | struct sock *sk; |
c0c77d8f BT |
1411 | |
1412 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) | |
1413 | return -EPERM; | |
1414 | if (sock->type != SOCK_RAW) | |
1415 | return -ESOCKTNOSUPPORT; | |
1416 | ||
1417 | if (protocol) | |
1418 | return -EPROTONOSUPPORT; | |
1419 | ||
1420 | sock->state = SS_UNCONNECTED; | |
1421 | ||
1422 | sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); | |
1423 | if (!sk) | |
1424 | return -ENOBUFS; | |
1425 | ||
1426 | sock->ops = &xsk_proto_ops; | |
1427 | ||
1428 | sock_init_data(sock, sk); | |
1429 | ||
1430 | sk->sk_family = PF_XDP; | |
1431 | ||
11fe9262 | 1432 | sk->sk_destruct = xsk_destruct; |
11fe9262 | 1433 | |
cee27167 BT |
1434 | sock_set_flag(sk, SOCK_RCU_FREE); |
1435 | ||
c0c77d8f | 1436 | xs = xdp_sk(sk); |
455302d1 | 1437 | xs->state = XSK_READY; |
c0c77d8f | 1438 | mutex_init(&xs->mutex); |
bf0bdd13 | 1439 | spin_lock_init(&xs->rx_lock); |
c0c77d8f | 1440 | |
0402acd6 BT |
1441 | INIT_LIST_HEAD(&xs->map_list); |
1442 | spin_lock_init(&xs->map_list_lock); | |
1443 | ||
1d0dc069 BT |
1444 | mutex_lock(&net->xdp.lock); |
1445 | sk_add_node_rcu(sk, &net->xdp.list); | |
1446 | mutex_unlock(&net->xdp.lock); | |
1447 | ||
c0c77d8f | 1448 | sock_prot_inuse_add(net, &xsk_proto, 1); |
c0c77d8f BT |
1449 | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | static const struct net_proto_family xsk_family_ops = { | |
1454 | .family = PF_XDP, | |
1455 | .create = xsk_create, | |
1456 | .owner = THIS_MODULE, | |
1457 | }; | |
1458 | ||
455302d1 IM |
1459 | static struct notifier_block xsk_netdev_notifier = { |
1460 | .notifier_call = xsk_notifier, | |
1461 | }; | |
1462 | ||
1d0dc069 BT |
1463 | static int __net_init xsk_net_init(struct net *net) |
1464 | { | |
1465 | mutex_init(&net->xdp.lock); | |
1466 | INIT_HLIST_HEAD(&net->xdp.list); | |
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | static void __net_exit xsk_net_exit(struct net *net) | |
1471 | { | |
1472 | WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); | |
1473 | } | |
1474 | ||
1475 | static struct pernet_operations xsk_net_ops = { | |
1476 | .init = xsk_net_init, | |
1477 | .exit = xsk_net_exit, | |
1478 | }; | |
1479 | ||
c0c77d8f BT |
1480 | static int __init xsk_init(void) |
1481 | { | |
e312b9e7 | 1482 | int err, cpu; |
c0c77d8f BT |
1483 | |
1484 | err = proto_register(&xsk_proto, 0 /* no slab */); | |
1485 | if (err) | |
1486 | goto out; | |
1487 | ||
1488 | err = sock_register(&xsk_family_ops); | |
1489 | if (err) | |
1490 | goto out_proto; | |
1491 | ||
1d0dc069 BT |
1492 | err = register_pernet_subsys(&xsk_net_ops); |
1493 | if (err) | |
1494 | goto out_sk; | |
455302d1 IM |
1495 | |
1496 | err = register_netdevice_notifier(&xsk_netdev_notifier); | |
1497 | if (err) | |
1498 | goto out_pernet; | |
1499 | ||
e312b9e7 BT |
1500 | for_each_possible_cpu(cpu) |
1501 | INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu)); | |
c0c77d8f BT |
1502 | return 0; |
1503 | ||
455302d1 IM |
1504 | out_pernet: |
1505 | unregister_pernet_subsys(&xsk_net_ops); | |
1d0dc069 BT |
1506 | out_sk: |
1507 | sock_unregister(PF_XDP); | |
c0c77d8f BT |
1508 | out_proto: |
1509 | proto_unregister(&xsk_proto); | |
1510 | out: | |
1511 | return err; | |
1512 | } | |
1513 | ||
1514 | fs_initcall(xsk_init); |