]>
Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e314dbdc PE |
2 | /* |
3 | * drivers/net/veth.c | |
4 | * | |
5 | * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc | |
6 | * | |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> | |
9 | * | |
10 | */ | |
11 | ||
e314dbdc | 12 | #include <linux/netdevice.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
e314dbdc PE |
14 | #include <linux/ethtool.h> |
15 | #include <linux/etherdevice.h> | |
cf05c700 | 16 | #include <linux/u64_stats_sync.h> |
e314dbdc | 17 | |
f7b12606 | 18 | #include <net/rtnetlink.h> |
e314dbdc PE |
19 | #include <net/dst.h> |
20 | #include <net/xfrm.h> | |
af87a3aa | 21 | #include <net/xdp.h> |
ecef969e | 22 | #include <linux/veth.h> |
9d9779e7 | 23 | #include <linux/module.h> |
948d4f21 TM |
24 | #include <linux/bpf.h> |
25 | #include <linux/filter.h> | |
26 | #include <linux/ptr_ring.h> | |
948d4f21 | 27 | #include <linux/bpf_trace.h> |
aa4e689e | 28 | #include <linux/net_tstamp.h> |
e314dbdc PE |
29 | |
30 | #define DRV_NAME "veth" | |
31 | #define DRV_VERSION "1.0" | |
32 | ||
9fc8d518 | 33 | #define VETH_XDP_FLAG BIT(0) |
948d4f21 TM |
34 | #define VETH_RING_SIZE 256 |
35 | #define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN) | |
36 | ||
d1396004 TM |
37 | /* Separating two types of XDP xmit */ |
38 | #define VETH_XDP_TX BIT(0) | |
39 | #define VETH_XDP_REDIR BIT(1) | |
40 | ||
9cda7807 TM |
41 | #define VETH_XDP_TX_BULK_SIZE 16 |
42 | ||
4195e54a TM |
43 | struct veth_rq_stats { |
44 | u64 xdp_packets; | |
45 | u64 xdp_bytes; | |
46 | u64 xdp_drops; | |
47 | struct u64_stats_sync syncp; | |
48 | }; | |
49 | ||
638264dc | 50 | struct veth_rq { |
948d4f21 TM |
51 | struct napi_struct xdp_napi; |
52 | struct net_device *dev; | |
53 | struct bpf_prog __rcu *xdp_prog; | |
d1396004 | 54 | struct xdp_mem_info xdp_mem; |
4195e54a | 55 | struct veth_rq_stats stats; |
948d4f21 TM |
56 | bool rx_notify_masked; |
57 | struct ptr_ring xdp_ring; | |
58 | struct xdp_rxq_info xdp_rxq; | |
e314dbdc PE |
59 | }; |
60 | ||
638264dc TM |
61 | struct veth_priv { |
62 | struct net_device __rcu *peer; | |
63 | atomic64_t dropped; | |
64 | struct bpf_prog *_xdp_prog; | |
65 | struct veth_rq *rq; | |
66 | unsigned int requested_headroom; | |
67 | }; | |
68 | ||
9cda7807 TM |
69 | struct veth_xdp_tx_bq { |
70 | struct xdp_frame *q[VETH_XDP_TX_BULK_SIZE]; | |
71 | unsigned int count; | |
72 | }; | |
73 | ||
e314dbdc PE |
74 | /* |
75 | * ethtool interface | |
76 | */ | |
77 | ||
d397b968 TM |
78 | struct veth_q_stat_desc { |
79 | char desc[ETH_GSTRING_LEN]; | |
80 | size_t offset; | |
81 | }; | |
82 | ||
83 | #define VETH_RQ_STAT(m) offsetof(struct veth_rq_stats, m) | |
84 | ||
85 | static const struct veth_q_stat_desc veth_rq_stats_desc[] = { | |
86 | { "xdp_packets", VETH_RQ_STAT(xdp_packets) }, | |
87 | { "xdp_bytes", VETH_RQ_STAT(xdp_bytes) }, | |
88 | { "xdp_drops", VETH_RQ_STAT(xdp_drops) }, | |
89 | }; | |
90 | ||
91 | #define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc) | |
92 | ||
e314dbdc PE |
93 | static struct { |
94 | const char string[ETH_GSTRING_LEN]; | |
95 | } ethtool_stats_keys[] = { | |
96 | { "peer_ifindex" }, | |
97 | }; | |
98 | ||
56607b98 PR |
99 | static int veth_get_link_ksettings(struct net_device *dev, |
100 | struct ethtool_link_ksettings *cmd) | |
e314dbdc | 101 | { |
56607b98 PR |
102 | cmd->base.speed = SPEED_10000; |
103 | cmd->base.duplex = DUPLEX_FULL; | |
104 | cmd->base.port = PORT_TP; | |
105 | cmd->base.autoneg = AUTONEG_DISABLE; | |
e314dbdc PE |
106 | return 0; |
107 | } | |
108 | ||
109 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
110 | { | |
33a5ba14 RJ |
111 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
112 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
e314dbdc PE |
113 | } |
114 | ||
115 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
116 | { | |
d397b968 TM |
117 | char *p = (char *)buf; |
118 | int i, j; | |
119 | ||
e314dbdc PE |
120 | switch(stringset) { |
121 | case ETH_SS_STATS: | |
d397b968 TM |
122 | memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
123 | p += sizeof(ethtool_stats_keys); | |
124 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
125 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
abdf47aa FF |
126 | snprintf(p, ETH_GSTRING_LEN, |
127 | "rx_queue_%u_%.11s", | |
d397b968 TM |
128 | i, veth_rq_stats_desc[j].desc); |
129 | p += ETH_GSTRING_LEN; | |
130 | } | |
131 | } | |
e314dbdc PE |
132 | break; |
133 | } | |
134 | } | |
135 | ||
b9f2c044 | 136 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 137 | { |
b9f2c044 JG |
138 | switch (sset) { |
139 | case ETH_SS_STATS: | |
d397b968 TM |
140 | return ARRAY_SIZE(ethtool_stats_keys) + |
141 | VETH_RQ_STATS_LEN * dev->real_num_rx_queues; | |
b9f2c044 JG |
142 | default: |
143 | return -EOPNOTSUPP; | |
144 | } | |
e314dbdc PE |
145 | } |
146 | ||
147 | static void veth_get_ethtool_stats(struct net_device *dev, | |
148 | struct ethtool_stats *stats, u64 *data) | |
149 | { | |
d0e2c55e ED |
150 | struct veth_priv *priv = netdev_priv(dev); |
151 | struct net_device *peer = rtnl_dereference(priv->peer); | |
d397b968 | 152 | int i, j, idx; |
e314dbdc | 153 | |
d0e2c55e | 154 | data[0] = peer ? peer->ifindex : 0; |
d397b968 TM |
155 | idx = 1; |
156 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
157 | const struct veth_rq_stats *rq_stats = &priv->rq[i].stats; | |
158 | const void *stats_base = (void *)rq_stats; | |
159 | unsigned int start; | |
160 | size_t offset; | |
161 | ||
162 | do { | |
163 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
164 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
165 | offset = veth_rq_stats_desc[j].offset; | |
166 | data[idx + j] = *(u64 *)(stats_base + offset); | |
167 | } | |
168 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
169 | idx += VETH_RQ_STATS_LEN; | |
170 | } | |
e314dbdc PE |
171 | } |
172 | ||
0fc0b732 | 173 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
174 | .get_drvinfo = veth_get_drvinfo, |
175 | .get_link = ethtool_op_get_link, | |
e314dbdc | 176 | .get_strings = veth_get_strings, |
b9f2c044 | 177 | .get_sset_count = veth_get_sset_count, |
e314dbdc | 178 | .get_ethtool_stats = veth_get_ethtool_stats, |
56607b98 | 179 | .get_link_ksettings = veth_get_link_ksettings, |
056b21fb | 180 | .get_ts_info = ethtool_op_get_ts_info, |
e314dbdc PE |
181 | }; |
182 | ||
948d4f21 TM |
183 | /* general routines */ |
184 | ||
9fc8d518 TM |
185 | static bool veth_is_xdp_frame(void *ptr) |
186 | { | |
187 | return (unsigned long)ptr & VETH_XDP_FLAG; | |
188 | } | |
189 | ||
190 | static void *veth_ptr_to_xdp(void *ptr) | |
191 | { | |
192 | return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG); | |
193 | } | |
194 | ||
af87a3aa TM |
195 | static void *veth_xdp_to_ptr(void *ptr) |
196 | { | |
197 | return (void *)((unsigned long)ptr | VETH_XDP_FLAG); | |
198 | } | |
199 | ||
9fc8d518 TM |
200 | static void veth_ptr_free(void *ptr) |
201 | { | |
202 | if (veth_is_xdp_frame(ptr)) | |
203 | xdp_return_frame(veth_ptr_to_xdp(ptr)); | |
204 | else | |
205 | kfree_skb(ptr); | |
206 | } | |
207 | ||
638264dc | 208 | static void __veth_xdp_flush(struct veth_rq *rq) |
948d4f21 TM |
209 | { |
210 | /* Write ptr_ring before reading rx_notify_masked */ | |
211 | smp_mb(); | |
638264dc TM |
212 | if (!rq->rx_notify_masked) { |
213 | rq->rx_notify_masked = true; | |
214 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
215 | } |
216 | } | |
217 | ||
638264dc | 218 | static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb) |
948d4f21 | 219 | { |
638264dc | 220 | if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) { |
948d4f21 TM |
221 | dev_kfree_skb_any(skb); |
222 | return NET_RX_DROP; | |
223 | } | |
224 | ||
225 | return NET_RX_SUCCESS; | |
226 | } | |
227 | ||
638264dc TM |
228 | static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, |
229 | struct veth_rq *rq, bool xdp) | |
e314dbdc | 230 | { |
948d4f21 | 231 | return __dev_forward_skb(dev, skb) ?: xdp ? |
638264dc | 232 | veth_xdp_rx(rq, skb) : |
948d4f21 TM |
233 | netif_rx(skb); |
234 | } | |
235 | ||
236 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) | |
237 | { | |
238 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
638264dc | 239 | struct veth_rq *rq = NULL; |
d0e2c55e | 240 | struct net_device *rcv; |
2681128f | 241 | int length = skb->len; |
948d4f21 | 242 | bool rcv_xdp = false; |
638264dc | 243 | int rxq; |
e314dbdc | 244 | |
d0e2c55e ED |
245 | rcu_read_lock(); |
246 | rcv = rcu_dereference(priv->peer); | |
247 | if (unlikely(!rcv)) { | |
248 | kfree_skb(skb); | |
249 | goto drop; | |
250 | } | |
e314dbdc | 251 | |
948d4f21 | 252 | rcv_priv = netdev_priv(rcv); |
638264dc TM |
253 | rxq = skb_get_queue_mapping(skb); |
254 | if (rxq < rcv->real_num_rx_queues) { | |
255 | rq = &rcv_priv->rq[rxq]; | |
256 | rcv_xdp = rcu_access_pointer(rq->xdp_prog); | |
257 | if (rcv_xdp) | |
258 | skb_record_rx_queue(skb, rxq); | |
259 | } | |
948d4f21 | 260 | |
aa4e689e | 261 | skb_tx_timestamp(skb); |
638264dc | 262 | if (likely(veth_forward_skb(rcv, skb, rq, rcv_xdp) == NET_RX_SUCCESS)) { |
b4fba476 ED |
263 | if (!rcv_xdp) |
264 | dev_lstats_add(dev, length); | |
2681128f | 265 | } else { |
d0e2c55e | 266 | drop: |
2681128f ED |
267 | atomic64_inc(&priv->dropped); |
268 | } | |
948d4f21 TM |
269 | |
270 | if (rcv_xdp) | |
638264dc | 271 | __veth_xdp_flush(rq); |
948d4f21 | 272 | |
d0e2c55e | 273 | rcu_read_unlock(); |
948d4f21 | 274 | |
6ed10654 | 275 | return NETDEV_TX_OK; |
e314dbdc PE |
276 | } |
277 | ||
b4fba476 | 278 | static u64 veth_stats_tx(struct net_device *dev, u64 *packets, u64 *bytes) |
e314dbdc | 279 | { |
cf05c700 | 280 | struct veth_priv *priv = netdev_priv(dev); |
cf05c700 | 281 | |
b4fba476 | 282 | dev_lstats_read(dev, packets, bytes); |
2681128f ED |
283 | return atomic64_read(&priv->dropped); |
284 | } | |
285 | ||
4195e54a TM |
286 | static void veth_stats_rx(struct veth_rq_stats *result, struct net_device *dev) |
287 | { | |
288 | struct veth_priv *priv = netdev_priv(dev); | |
289 | int i; | |
290 | ||
291 | result->xdp_packets = 0; | |
292 | result->xdp_bytes = 0; | |
293 | result->xdp_drops = 0; | |
294 | for (i = 0; i < dev->num_rx_queues; i++) { | |
295 | struct veth_rq_stats *stats = &priv->rq[i].stats; | |
296 | u64 packets, bytes, drops; | |
297 | unsigned int start; | |
298 | ||
299 | do { | |
300 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
301 | packets = stats->xdp_packets; | |
302 | bytes = stats->xdp_bytes; | |
303 | drops = stats->xdp_drops; | |
304 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
305 | result->xdp_packets += packets; | |
306 | result->xdp_bytes += bytes; | |
307 | result->xdp_drops += drops; | |
308 | } | |
309 | } | |
310 | ||
bc1f4470 | 311 | static void veth_get_stats64(struct net_device *dev, |
312 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
313 | { |
314 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 315 | struct net_device *peer; |
4195e54a | 316 | struct veth_rq_stats rx; |
b4fba476 | 317 | u64 packets, bytes; |
4195e54a | 318 | |
b4fba476 ED |
319 | tot->tx_dropped = veth_stats_tx(dev, &packets, &bytes); |
320 | tot->tx_bytes = bytes; | |
321 | tot->tx_packets = packets; | |
2681128f | 322 | |
4195e54a TM |
323 | veth_stats_rx(&rx, dev); |
324 | tot->rx_dropped = rx.xdp_drops; | |
325 | tot->rx_bytes = rx.xdp_bytes; | |
326 | tot->rx_packets = rx.xdp_packets; | |
2681128f | 327 | |
d0e2c55e ED |
328 | rcu_read_lock(); |
329 | peer = rcu_dereference(priv->peer); | |
330 | if (peer) { | |
b4fba476 ED |
331 | tot->rx_dropped += veth_stats_tx(peer, &packets, &bytes); |
332 | tot->rx_bytes += bytes; | |
333 | tot->rx_packets += packets; | |
4195e54a TM |
334 | |
335 | veth_stats_rx(&rx, peer); | |
336 | tot->tx_bytes += rx.xdp_bytes; | |
337 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
338 | } |
339 | rcu_read_unlock(); | |
e314dbdc PE |
340 | } |
341 | ||
5c70ef85 G |
342 | /* fake multicast ability */ |
343 | static void veth_set_multicast_list(struct net_device *dev) | |
344 | { | |
345 | } | |
346 | ||
948d4f21 TM |
347 | static struct sk_buff *veth_build_skb(void *head, int headroom, int len, |
348 | int buflen) | |
349 | { | |
350 | struct sk_buff *skb; | |
351 | ||
352 | if (!buflen) { | |
353 | buflen = SKB_DATA_ALIGN(headroom + len) + | |
354 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
355 | } | |
356 | skb = build_skb(head, buflen); | |
357 | if (!skb) | |
358 | return NULL; | |
359 | ||
360 | skb_reserve(skb, headroom); | |
361 | skb_put(skb, len); | |
362 | ||
363 | return skb; | |
364 | } | |
365 | ||
638264dc TM |
366 | static int veth_select_rxq(struct net_device *dev) |
367 | { | |
368 | return smp_processor_id() % dev->real_num_rx_queues; | |
369 | } | |
370 | ||
af87a3aa TM |
371 | static int veth_xdp_xmit(struct net_device *dev, int n, |
372 | struct xdp_frame **frames, u32 flags) | |
373 | { | |
374 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
375 | struct net_device *rcv; | |
2131479d | 376 | int i, ret, drops = n; |
af87a3aa | 377 | unsigned int max_len; |
638264dc | 378 | struct veth_rq *rq; |
af87a3aa | 379 | |
b23bfa56 | 380 | rcu_read_lock(); |
2131479d TM |
381 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { |
382 | ret = -EINVAL; | |
383 | goto drop; | |
384 | } | |
af87a3aa TM |
385 | |
386 | rcv = rcu_dereference(priv->peer); | |
2131479d TM |
387 | if (unlikely(!rcv)) { |
388 | ret = -ENXIO; | |
389 | goto drop; | |
390 | } | |
af87a3aa TM |
391 | |
392 | rcv_priv = netdev_priv(rcv); | |
638264dc | 393 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
af87a3aa TM |
394 | /* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive |
395 | * side. This means an XDP program is loaded on the peer and the peer | |
396 | * device is up. | |
397 | */ | |
2131479d TM |
398 | if (!rcu_access_pointer(rq->xdp_prog)) { |
399 | ret = -ENXIO; | |
400 | goto drop; | |
401 | } | |
af87a3aa | 402 | |
2131479d | 403 | drops = 0; |
af87a3aa TM |
404 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; |
405 | ||
638264dc | 406 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
407 | for (i = 0; i < n; i++) { |
408 | struct xdp_frame *frame = frames[i]; | |
409 | void *ptr = veth_xdp_to_ptr(frame); | |
410 | ||
411 | if (unlikely(frame->len > max_len || | |
638264dc | 412 | __ptr_ring_produce(&rq->xdp_ring, ptr))) { |
af87a3aa TM |
413 | xdp_return_frame_rx_napi(frame); |
414 | drops++; | |
415 | } | |
416 | } | |
638264dc | 417 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
418 | |
419 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 420 | __veth_xdp_flush(rq); |
af87a3aa | 421 | |
b23bfa56 JF |
422 | if (likely(!drops)) { |
423 | rcu_read_unlock(); | |
2131479d | 424 | return n; |
b23bfa56 | 425 | } |
2131479d TM |
426 | |
427 | ret = n - drops; | |
428 | drop: | |
b23bfa56 | 429 | rcu_read_unlock(); |
2131479d TM |
430 | atomic64_add(drops, &priv->dropped); |
431 | ||
432 | return ret; | |
af87a3aa TM |
433 | } |
434 | ||
9cda7807 TM |
435 | static void veth_xdp_flush_bq(struct net_device *dev, struct veth_xdp_tx_bq *bq) |
436 | { | |
437 | int sent, i, err = 0; | |
438 | ||
439 | sent = veth_xdp_xmit(dev, bq->count, bq->q, 0); | |
440 | if (sent < 0) { | |
441 | err = sent; | |
442 | sent = 0; | |
443 | for (i = 0; i < bq->count; i++) | |
444 | xdp_return_frame(bq->q[i]); | |
445 | } | |
446 | trace_xdp_bulk_tx(dev, sent, bq->count - sent, err); | |
447 | ||
448 | bq->count = 0; | |
449 | } | |
450 | ||
451 | static void veth_xdp_flush(struct net_device *dev, struct veth_xdp_tx_bq *bq) | |
d1396004 TM |
452 | { |
453 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
454 | struct net_device *rcv; | |
638264dc | 455 | struct veth_rq *rq; |
d1396004 TM |
456 | |
457 | rcu_read_lock(); | |
9cda7807 | 458 | veth_xdp_flush_bq(dev, bq); |
d1396004 TM |
459 | rcv = rcu_dereference(priv->peer); |
460 | if (unlikely(!rcv)) | |
461 | goto out; | |
462 | ||
463 | rcv_priv = netdev_priv(rcv); | |
638264dc | 464 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 465 | /* xdp_ring is initialized on receive side? */ |
638264dc | 466 | if (unlikely(!rcu_access_pointer(rq->xdp_prog))) |
d1396004 TM |
467 | goto out; |
468 | ||
638264dc | 469 | __veth_xdp_flush(rq); |
d1396004 TM |
470 | out: |
471 | rcu_read_unlock(); | |
472 | } | |
473 | ||
9cda7807 TM |
474 | static int veth_xdp_tx(struct net_device *dev, struct xdp_buff *xdp, |
475 | struct veth_xdp_tx_bq *bq) | |
d1396004 TM |
476 | { |
477 | struct xdp_frame *frame = convert_to_xdp_frame(xdp); | |
478 | ||
479 | if (unlikely(!frame)) | |
480 | return -EOVERFLOW; | |
481 | ||
9cda7807 TM |
482 | if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE)) |
483 | veth_xdp_flush_bq(dev, bq); | |
484 | ||
485 | bq->q[bq->count++] = frame; | |
486 | ||
487 | return 0; | |
d1396004 TM |
488 | } |
489 | ||
638264dc | 490 | static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, |
d1396004 | 491 | struct xdp_frame *frame, |
9cda7807 TM |
492 | unsigned int *xdp_xmit, |
493 | struct veth_xdp_tx_bq *bq) | |
9fc8d518 TM |
494 | { |
495 | void *hard_start = frame->data - frame->headroom; | |
496 | void *head = hard_start - sizeof(struct xdp_frame); | |
497 | int len = frame->len, delta = 0; | |
d1396004 | 498 | struct xdp_frame orig_frame; |
9fc8d518 TM |
499 | struct bpf_prog *xdp_prog; |
500 | unsigned int headroom; | |
501 | struct sk_buff *skb; | |
502 | ||
503 | rcu_read_lock(); | |
638264dc | 504 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 TM |
505 | if (likely(xdp_prog)) { |
506 | struct xdp_buff xdp; | |
507 | u32 act; | |
508 | ||
509 | xdp.data_hard_start = hard_start; | |
510 | xdp.data = frame->data; | |
511 | xdp.data_end = frame->data + frame->len; | |
512 | xdp.data_meta = frame->data - frame->metasize; | |
638264dc | 513 | xdp.rxq = &rq->xdp_rxq; |
9fc8d518 TM |
514 | |
515 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
516 | ||
517 | switch (act) { | |
518 | case XDP_PASS: | |
519 | delta = frame->data - xdp.data; | |
520 | len = xdp.data_end - xdp.data; | |
521 | break; | |
d1396004 TM |
522 | case XDP_TX: |
523 | orig_frame = *frame; | |
524 | xdp.data_hard_start = head; | |
525 | xdp.rxq->mem = frame->mem; | |
9cda7807 | 526 | if (unlikely(veth_xdp_tx(rq->dev, &xdp, bq) < 0)) { |
638264dc | 527 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 TM |
528 | frame = &orig_frame; |
529 | goto err_xdp; | |
530 | } | |
531 | *xdp_xmit |= VETH_XDP_TX; | |
532 | rcu_read_unlock(); | |
533 | goto xdp_xmit; | |
534 | case XDP_REDIRECT: | |
535 | orig_frame = *frame; | |
536 | xdp.data_hard_start = head; | |
537 | xdp.rxq->mem = frame->mem; | |
638264dc | 538 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
d1396004 TM |
539 | frame = &orig_frame; |
540 | goto err_xdp; | |
541 | } | |
542 | *xdp_xmit |= VETH_XDP_REDIR; | |
543 | rcu_read_unlock(); | |
544 | goto xdp_xmit; | |
9fc8d518 TM |
545 | default: |
546 | bpf_warn_invalid_xdp_action(act); | |
a9b6d9ef | 547 | /* fall through */ |
9fc8d518 | 548 | case XDP_ABORTED: |
638264dc | 549 | trace_xdp_exception(rq->dev, xdp_prog, act); |
a9b6d9ef | 550 | /* fall through */ |
9fc8d518 TM |
551 | case XDP_DROP: |
552 | goto err_xdp; | |
553 | } | |
554 | } | |
555 | rcu_read_unlock(); | |
556 | ||
557 | headroom = sizeof(struct xdp_frame) + frame->headroom - delta; | |
558 | skb = veth_build_skb(head, headroom, len, 0); | |
559 | if (!skb) { | |
560 | xdp_return_frame(frame); | |
561 | goto err; | |
562 | } | |
563 | ||
cbf33510 | 564 | xdp_release_frame(frame); |
9fc8d518 | 565 | xdp_scrub_frame(frame); |
638264dc | 566 | skb->protocol = eth_type_trans(skb, rq->dev); |
9fc8d518 TM |
567 | err: |
568 | return skb; | |
569 | err_xdp: | |
570 | rcu_read_unlock(); | |
571 | xdp_return_frame(frame); | |
d1396004 | 572 | xdp_xmit: |
9fc8d518 TM |
573 | return NULL; |
574 | } | |
575 | ||
638264dc | 576 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, struct sk_buff *skb, |
9cda7807 TM |
577 | unsigned int *xdp_xmit, |
578 | struct veth_xdp_tx_bq *bq) | |
948d4f21 TM |
579 | { |
580 | u32 pktlen, headroom, act, metalen; | |
581 | void *orig_data, *orig_data_end; | |
582 | struct bpf_prog *xdp_prog; | |
583 | int mac_len, delta, off; | |
584 | struct xdp_buff xdp; | |
585 | ||
4bf9ffa0 TM |
586 | skb_orphan(skb); |
587 | ||
948d4f21 | 588 | rcu_read_lock(); |
638264dc | 589 | xdp_prog = rcu_dereference(rq->xdp_prog); |
948d4f21 TM |
590 | if (unlikely(!xdp_prog)) { |
591 | rcu_read_unlock(); | |
592 | goto out; | |
593 | } | |
594 | ||
595 | mac_len = skb->data - skb_mac_header(skb); | |
596 | pktlen = skb->len + mac_len; | |
597 | headroom = skb_headroom(skb) - mac_len; | |
598 | ||
599 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
600 | skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) { | |
601 | struct sk_buff *nskb; | |
602 | int size, head_off; | |
603 | void *head, *start; | |
604 | struct page *page; | |
605 | ||
606 | size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) + | |
607 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
608 | if (size > PAGE_SIZE) | |
609 | goto drop; | |
610 | ||
611 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | |
612 | if (!page) | |
613 | goto drop; | |
614 | ||
615 | head = page_address(page); | |
616 | start = head + VETH_XDP_HEADROOM; | |
617 | if (skb_copy_bits(skb, -mac_len, start, pktlen)) { | |
618 | page_frag_free(head); | |
619 | goto drop; | |
620 | } | |
621 | ||
622 | nskb = veth_build_skb(head, | |
623 | VETH_XDP_HEADROOM + mac_len, skb->len, | |
624 | PAGE_SIZE); | |
625 | if (!nskb) { | |
626 | page_frag_free(head); | |
627 | goto drop; | |
628 | } | |
629 | ||
630 | skb_copy_header(nskb, skb); | |
631 | head_off = skb_headroom(nskb) - skb_headroom(skb); | |
632 | skb_headers_offset_update(nskb, head_off); | |
948d4f21 TM |
633 | consume_skb(skb); |
634 | skb = nskb; | |
635 | } | |
636 | ||
637 | xdp.data_hard_start = skb->head; | |
638 | xdp.data = skb_mac_header(skb); | |
639 | xdp.data_end = xdp.data + pktlen; | |
640 | xdp.data_meta = xdp.data; | |
638264dc | 641 | xdp.rxq = &rq->xdp_rxq; |
948d4f21 TM |
642 | orig_data = xdp.data; |
643 | orig_data_end = xdp.data_end; | |
644 | ||
645 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
646 | ||
647 | switch (act) { | |
648 | case XDP_PASS: | |
649 | break; | |
d1396004 TM |
650 | case XDP_TX: |
651 | get_page(virt_to_page(xdp.data)); | |
652 | consume_skb(skb); | |
638264dc | 653 | xdp.rxq->mem = rq->xdp_mem; |
9cda7807 | 654 | if (unlikely(veth_xdp_tx(rq->dev, &xdp, bq) < 0)) { |
638264dc | 655 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 TM |
656 | goto err_xdp; |
657 | } | |
658 | *xdp_xmit |= VETH_XDP_TX; | |
659 | rcu_read_unlock(); | |
660 | goto xdp_xmit; | |
661 | case XDP_REDIRECT: | |
662 | get_page(virt_to_page(xdp.data)); | |
663 | consume_skb(skb); | |
638264dc TM |
664 | xdp.rxq->mem = rq->xdp_mem; |
665 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) | |
d1396004 TM |
666 | goto err_xdp; |
667 | *xdp_xmit |= VETH_XDP_REDIR; | |
668 | rcu_read_unlock(); | |
669 | goto xdp_xmit; | |
948d4f21 TM |
670 | default: |
671 | bpf_warn_invalid_xdp_action(act); | |
a9b6d9ef | 672 | /* fall through */ |
948d4f21 | 673 | case XDP_ABORTED: |
638264dc | 674 | trace_xdp_exception(rq->dev, xdp_prog, act); |
a9b6d9ef | 675 | /* fall through */ |
948d4f21 TM |
676 | case XDP_DROP: |
677 | goto drop; | |
678 | } | |
679 | rcu_read_unlock(); | |
680 | ||
681 | delta = orig_data - xdp.data; | |
682 | off = mac_len + delta; | |
683 | if (off > 0) | |
684 | __skb_push(skb, off); | |
685 | else if (off < 0) | |
686 | __skb_pull(skb, -off); | |
687 | skb->mac_header -= delta; | |
688 | off = xdp.data_end - orig_data_end; | |
689 | if (off != 0) | |
690 | __skb_put(skb, off); | |
638264dc | 691 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 TM |
692 | |
693 | metalen = xdp.data - xdp.data_meta; | |
694 | if (metalen) | |
695 | skb_metadata_set(skb, metalen); | |
696 | out: | |
697 | return skb; | |
698 | drop: | |
699 | rcu_read_unlock(); | |
700 | kfree_skb(skb); | |
701 | return NULL; | |
d1396004 TM |
702 | err_xdp: |
703 | rcu_read_unlock(); | |
704 | page_frag_free(xdp.data); | |
705 | xdp_xmit: | |
706 | return NULL; | |
948d4f21 TM |
707 | } |
708 | ||
9cda7807 TM |
709 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, unsigned int *xdp_xmit, |
710 | struct veth_xdp_tx_bq *bq) | |
948d4f21 | 711 | { |
4195e54a | 712 | int i, done = 0, drops = 0, bytes = 0; |
948d4f21 TM |
713 | |
714 | for (i = 0; i < budget; i++) { | |
638264dc | 715 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
4195e54a | 716 | unsigned int xdp_xmit_one = 0; |
9fc8d518 | 717 | struct sk_buff *skb; |
948d4f21 | 718 | |
9fc8d518 | 719 | if (!ptr) |
948d4f21 TM |
720 | break; |
721 | ||
d1396004 | 722 | if (veth_is_xdp_frame(ptr)) { |
4195e54a TM |
723 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
724 | ||
725 | bytes += frame->len; | |
9cda7807 | 726 | skb = veth_xdp_rcv_one(rq, frame, &xdp_xmit_one, bq); |
d1396004 | 727 | } else { |
4195e54a TM |
728 | skb = ptr; |
729 | bytes += skb->len; | |
9cda7807 | 730 | skb = veth_xdp_rcv_skb(rq, skb, &xdp_xmit_one, bq); |
d1396004 | 731 | } |
4195e54a | 732 | *xdp_xmit |= xdp_xmit_one; |
948d4f21 TM |
733 | |
734 | if (skb) | |
638264dc | 735 | napi_gro_receive(&rq->xdp_napi, skb); |
4195e54a TM |
736 | else if (!xdp_xmit_one) |
737 | drops++; | |
948d4f21 TM |
738 | |
739 | done++; | |
740 | } | |
741 | ||
4195e54a TM |
742 | u64_stats_update_begin(&rq->stats.syncp); |
743 | rq->stats.xdp_packets += done; | |
744 | rq->stats.xdp_bytes += bytes; | |
745 | rq->stats.xdp_drops += drops; | |
746 | u64_stats_update_end(&rq->stats.syncp); | |
747 | ||
948d4f21 TM |
748 | return done; |
749 | } | |
750 | ||
751 | static int veth_poll(struct napi_struct *napi, int budget) | |
752 | { | |
638264dc TM |
753 | struct veth_rq *rq = |
754 | container_of(napi, struct veth_rq, xdp_napi); | |
d1396004 | 755 | unsigned int xdp_xmit = 0; |
9cda7807 | 756 | struct veth_xdp_tx_bq bq; |
948d4f21 TM |
757 | int done; |
758 | ||
9cda7807 TM |
759 | bq.count = 0; |
760 | ||
d1396004 | 761 | xdp_set_return_frame_no_direct(); |
9cda7807 | 762 | done = veth_xdp_rcv(rq, budget, &xdp_xmit, &bq); |
948d4f21 TM |
763 | |
764 | if (done < budget && napi_complete_done(napi, done)) { | |
765 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
766 | smp_store_mb(rq->rx_notify_masked, false); |
767 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
768 | rq->rx_notify_masked = true; | |
769 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
770 | } |
771 | } | |
772 | ||
d1396004 | 773 | if (xdp_xmit & VETH_XDP_TX) |
9cda7807 | 774 | veth_xdp_flush(rq->dev, &bq); |
d1396004 | 775 | if (xdp_xmit & VETH_XDP_REDIR) |
1d233886 | 776 | xdp_do_flush(); |
d1396004 TM |
777 | xdp_clear_return_frame_no_direct(); |
778 | ||
948d4f21 TM |
779 | return done; |
780 | } | |
781 | ||
782 | static int veth_napi_add(struct net_device *dev) | |
783 | { | |
784 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 785 | int err, i; |
948d4f21 | 786 | |
638264dc TM |
787 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
788 | struct veth_rq *rq = &priv->rq[i]; | |
789 | ||
790 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
791 | if (err) | |
792 | goto err_xdp_ring; | |
793 | } | |
948d4f21 | 794 | |
638264dc TM |
795 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
796 | struct veth_rq *rq = &priv->rq[i]; | |
797 | ||
798 | netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT); | |
799 | napi_enable(&rq->xdp_napi); | |
800 | } | |
948d4f21 TM |
801 | |
802 | return 0; | |
638264dc TM |
803 | err_xdp_ring: |
804 | for (i--; i >= 0; i--) | |
805 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); | |
806 | ||
807 | return err; | |
948d4f21 TM |
808 | } |
809 | ||
810 | static void veth_napi_del(struct net_device *dev) | |
811 | { | |
812 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 813 | int i; |
948d4f21 | 814 | |
638264dc TM |
815 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
816 | struct veth_rq *rq = &priv->rq[i]; | |
817 | ||
818 | napi_disable(&rq->xdp_napi); | |
819 | napi_hash_del(&rq->xdp_napi); | |
820 | } | |
821 | synchronize_net(); | |
822 | ||
823 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
824 | struct veth_rq *rq = &priv->rq[i]; | |
825 | ||
826 | netif_napi_del(&rq->xdp_napi); | |
827 | rq->rx_notify_masked = false; | |
828 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
829 | } | |
948d4f21 TM |
830 | } |
831 | ||
832 | static int veth_enable_xdp(struct net_device *dev) | |
833 | { | |
834 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 835 | int err, i; |
948d4f21 | 836 | |
638264dc TM |
837 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { |
838 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
839 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 840 | |
638264dc TM |
841 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i); |
842 | if (err < 0) | |
843 | goto err_rxq_reg; | |
844 | ||
845 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
846 | MEM_TYPE_PAGE_SHARED, | |
847 | NULL); | |
848 | if (err < 0) | |
849 | goto err_reg_mem; | |
850 | ||
851 | /* Save original mem info as it can be overwritten */ | |
852 | rq->xdp_mem = rq->xdp_rxq.mem; | |
853 | } | |
948d4f21 TM |
854 | |
855 | err = veth_napi_add(dev); | |
856 | if (err) | |
638264dc | 857 | goto err_rxq_reg; |
948d4f21 TM |
858 | } |
859 | ||
638264dc TM |
860 | for (i = 0; i < dev->real_num_rx_queues; i++) |
861 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); | |
948d4f21 TM |
862 | |
863 | return 0; | |
638264dc TM |
864 | err_reg_mem: |
865 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
866 | err_rxq_reg: | |
867 | for (i--; i >= 0; i--) | |
868 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
948d4f21 TM |
869 | |
870 | return err; | |
871 | } | |
872 | ||
873 | static void veth_disable_xdp(struct net_device *dev) | |
874 | { | |
875 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 876 | int i; |
948d4f21 | 877 | |
638264dc TM |
878 | for (i = 0; i < dev->real_num_rx_queues; i++) |
879 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
948d4f21 | 880 | veth_napi_del(dev); |
638264dc TM |
881 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
882 | struct veth_rq *rq = &priv->rq[i]; | |
883 | ||
884 | rq->xdp_rxq.mem = rq->xdp_mem; | |
885 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
886 | } | |
948d4f21 TM |
887 | } |
888 | ||
e314dbdc PE |
889 | static int veth_open(struct net_device *dev) |
890 | { | |
d0e2c55e ED |
891 | struct veth_priv *priv = netdev_priv(dev); |
892 | struct net_device *peer = rtnl_dereference(priv->peer); | |
948d4f21 | 893 | int err; |
e314dbdc | 894 | |
d0e2c55e | 895 | if (!peer) |
e314dbdc PE |
896 | return -ENOTCONN; |
897 | ||
948d4f21 TM |
898 | if (priv->_xdp_prog) { |
899 | err = veth_enable_xdp(dev); | |
900 | if (err) | |
901 | return err; | |
902 | } | |
903 | ||
d0e2c55e | 904 | if (peer->flags & IFF_UP) { |
e314dbdc | 905 | netif_carrier_on(dev); |
d0e2c55e | 906 | netif_carrier_on(peer); |
e314dbdc | 907 | } |
948d4f21 | 908 | |
e314dbdc PE |
909 | return 0; |
910 | } | |
911 | ||
2cf48a10 EB |
912 | static int veth_close(struct net_device *dev) |
913 | { | |
914 | struct veth_priv *priv = netdev_priv(dev); | |
2efd32ee | 915 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
916 | |
917 | netif_carrier_off(dev); | |
2efd32ee ED |
918 | if (peer) |
919 | netif_carrier_off(peer); | |
2cf48a10 | 920 | |
948d4f21 TM |
921 | if (priv->_xdp_prog) |
922 | veth_disable_xdp(dev); | |
923 | ||
2cf48a10 EB |
924 | return 0; |
925 | } | |
926 | ||
91572088 | 927 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 928 | { |
91572088 | 929 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
930 | } |
931 | ||
7797b93b TM |
932 | static int veth_alloc_queues(struct net_device *dev) |
933 | { | |
934 | struct veth_priv *priv = netdev_priv(dev); | |
935 | int i; | |
936 | ||
937 | priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL); | |
938 | if (!priv->rq) | |
939 | return -ENOMEM; | |
940 | ||
4195e54a | 941 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 942 | priv->rq[i].dev = dev; |
4195e54a TM |
943 | u64_stats_init(&priv->rq[i].stats.syncp); |
944 | } | |
7797b93b TM |
945 | |
946 | return 0; | |
947 | } | |
948 | ||
949 | static void veth_free_queues(struct net_device *dev) | |
950 | { | |
951 | struct veth_priv *priv = netdev_priv(dev); | |
952 | ||
953 | kfree(priv->rq); | |
954 | } | |
955 | ||
e314dbdc PE |
956 | static int veth_dev_init(struct net_device *dev) |
957 | { | |
7797b93b TM |
958 | int err; |
959 | ||
14d73416 LR |
960 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
961 | if (!dev->lstats) | |
e314dbdc | 962 | return -ENOMEM; |
7797b93b TM |
963 | |
964 | err = veth_alloc_queues(dev); | |
965 | if (err) { | |
14d73416 | 966 | free_percpu(dev->lstats); |
7797b93b TM |
967 | return err; |
968 | } | |
969 | ||
e314dbdc PE |
970 | return 0; |
971 | } | |
972 | ||
11687a10 DM |
973 | static void veth_dev_free(struct net_device *dev) |
974 | { | |
7797b93b | 975 | veth_free_queues(dev); |
14d73416 | 976 | free_percpu(dev->lstats); |
11687a10 DM |
977 | } |
978 | ||
bb446c19 WC |
979 | #ifdef CONFIG_NET_POLL_CONTROLLER |
980 | static void veth_poll_controller(struct net_device *dev) | |
981 | { | |
982 | /* veth only receives frames when its peer sends one | |
948d4f21 | 983 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
984 | * never to have pending data when we poll for it so |
985 | * there is nothing to do here. | |
986 | * | |
987 | * We need this though so netpoll recognizes us as an interface that | |
988 | * supports polling, which enables bridge devices in virt setups to | |
989 | * still use netconsole | |
990 | */ | |
991 | } | |
992 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
993 | ||
a45253bf ND |
994 | static int veth_get_iflink(const struct net_device *dev) |
995 | { | |
996 | struct veth_priv *priv = netdev_priv(dev); | |
997 | struct net_device *peer; | |
998 | int iflink; | |
999 | ||
1000 | rcu_read_lock(); | |
1001 | peer = rcu_dereference(priv->peer); | |
1002 | iflink = peer ? peer->ifindex : 0; | |
1003 | rcu_read_unlock(); | |
1004 | ||
1005 | return iflink; | |
1006 | } | |
1007 | ||
dc224822 TM |
1008 | static netdev_features_t veth_fix_features(struct net_device *dev, |
1009 | netdev_features_t features) | |
1010 | { | |
1011 | struct veth_priv *priv = netdev_priv(dev); | |
1012 | struct net_device *peer; | |
1013 | ||
1014 | peer = rtnl_dereference(priv->peer); | |
1015 | if (peer) { | |
1016 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1017 | ||
1018 | if (peer_priv->_xdp_prog) | |
1019 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1020 | } | |
1021 | ||
1022 | return features; | |
1023 | } | |
1024 | ||
163e5292 PA |
1025 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1026 | { | |
1027 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1028 | struct net_device *peer; | |
1029 | ||
1030 | if (new_hr < 0) | |
1031 | new_hr = 0; | |
1032 | ||
1033 | rcu_read_lock(); | |
1034 | peer = rcu_dereference(priv->peer); | |
1035 | if (unlikely(!peer)) | |
1036 | goto out; | |
1037 | ||
1038 | peer_priv = netdev_priv(peer); | |
1039 | priv->requested_headroom = new_hr; | |
1040 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1041 | dev->needed_headroom = new_hr; | |
1042 | peer->needed_headroom = new_hr; | |
1043 | ||
1044 | out: | |
1045 | rcu_read_unlock(); | |
1046 | } | |
1047 | ||
948d4f21 TM |
1048 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1049 | struct netlink_ext_ack *extack) | |
1050 | { | |
1051 | struct veth_priv *priv = netdev_priv(dev); | |
1052 | struct bpf_prog *old_prog; | |
1053 | struct net_device *peer; | |
dc224822 | 1054 | unsigned int max_mtu; |
948d4f21 TM |
1055 | int err; |
1056 | ||
1057 | old_prog = priv->_xdp_prog; | |
1058 | priv->_xdp_prog = prog; | |
1059 | peer = rtnl_dereference(priv->peer); | |
1060 | ||
1061 | if (prog) { | |
1062 | if (!peer) { | |
1063 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1064 | err = -ENOTCONN; | |
1065 | goto err; | |
1066 | } | |
1067 | ||
dc224822 TM |
1068 | max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM - |
1069 | peer->hard_header_len - | |
1070 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1071 | if (peer->mtu > max_mtu) { | |
1072 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1073 | err = -ERANGE; | |
1074 | goto err; | |
1075 | } | |
1076 | ||
638264dc TM |
1077 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1078 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1079 | err = -ENOSPC; | |
1080 | goto err; | |
1081 | } | |
1082 | ||
948d4f21 TM |
1083 | if (dev->flags & IFF_UP) { |
1084 | err = veth_enable_xdp(dev); | |
1085 | if (err) { | |
1086 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1087 | goto err; | |
1088 | } | |
1089 | } | |
dc224822 TM |
1090 | |
1091 | if (!old_prog) { | |
1092 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1093 | peer->max_mtu = max_mtu; | |
1094 | } | |
948d4f21 TM |
1095 | } |
1096 | ||
1097 | if (old_prog) { | |
dc224822 TM |
1098 | if (!prog) { |
1099 | if (dev->flags & IFF_UP) | |
1100 | veth_disable_xdp(dev); | |
1101 | ||
1102 | if (peer) { | |
1103 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1104 | peer->max_mtu = ETH_MAX_MTU; | |
1105 | } | |
1106 | } | |
948d4f21 TM |
1107 | bpf_prog_put(old_prog); |
1108 | } | |
1109 | ||
dc224822 TM |
1110 | if ((!!old_prog ^ !!prog) && peer) |
1111 | netdev_update_features(peer); | |
1112 | ||
948d4f21 TM |
1113 | return 0; |
1114 | err: | |
1115 | priv->_xdp_prog = old_prog; | |
1116 | ||
1117 | return err; | |
1118 | } | |
1119 | ||
1120 | static u32 veth_xdp_query(struct net_device *dev) | |
1121 | { | |
1122 | struct veth_priv *priv = netdev_priv(dev); | |
1123 | const struct bpf_prog *xdp_prog; | |
1124 | ||
1125 | xdp_prog = priv->_xdp_prog; | |
1126 | if (xdp_prog) | |
1127 | return xdp_prog->aux->id; | |
1128 | ||
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) | |
1133 | { | |
1134 | switch (xdp->command) { | |
1135 | case XDP_SETUP_PROG: | |
1136 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
1137 | case XDP_QUERY_PROG: | |
1138 | xdp->prog_id = veth_xdp_query(dev); | |
1139 | return 0; | |
1140 | default: | |
1141 | return -EINVAL; | |
1142 | } | |
1143 | } | |
1144 | ||
4456e7bd | 1145 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1146 | .ndo_init = veth_dev_init, |
1147 | .ndo_open = veth_open, | |
2cf48a10 | 1148 | .ndo_stop = veth_close, |
ee923623 | 1149 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1150 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1151 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1152 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1153 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1154 | .ndo_poll_controller = veth_poll_controller, | |
1155 | #endif | |
a45253bf | 1156 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1157 | .ndo_fix_features = veth_fix_features, |
1a04a821 | 1158 | .ndo_features_check = passthru_features_check, |
163e5292 | 1159 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1160 | .ndo_bpf = veth_xdp, |
af87a3aa | 1161 | .ndo_xdp_xmit = veth_xdp_xmit, |
4456e7bd SH |
1162 | }; |
1163 | ||
732912d7 | 1164 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1165 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1166 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1167 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1168 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1169 | |
e314dbdc PE |
1170 | static void veth_setup(struct net_device *dev) |
1171 | { | |
1172 | ether_setup(dev); | |
1173 | ||
550fd08c | 1174 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1175 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1176 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1177 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1178 | |
4456e7bd | 1179 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
1180 | dev->ethtool_ops = &veth_ethtool_ops; |
1181 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1182 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1183 | dev->vlan_features = dev->features & |
3f8c707b VY |
1184 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1185 | NETIF_F_HW_VLAN_STAG_TX | | |
1186 | NETIF_F_HW_VLAN_CTAG_RX | | |
1187 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1188 | dev->needs_free_netdev = true; |
1189 | dev->priv_destructor = veth_dev_free; | |
91572088 | 1190 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1191 | |
8093315a | 1192 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1193 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1194 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
e314dbdc PE |
1195 | } |
1196 | ||
1197 | /* | |
1198 | * netlink interface | |
1199 | */ | |
1200 | ||
a8b8a889 MS |
1201 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1202 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1203 | { |
1204 | if (tb[IFLA_ADDRESS]) { | |
1205 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1206 | return -EINVAL; | |
1207 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1208 | return -EADDRNOTAVAIL; | |
1209 | } | |
38d40815 EB |
1210 | if (tb[IFLA_MTU]) { |
1211 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1212 | return -EINVAL; | |
1213 | } | |
e314dbdc PE |
1214 | return 0; |
1215 | } | |
1216 | ||
1217 | static struct rtnl_link_ops veth_link_ops; | |
1218 | ||
81adee47 | 1219 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1220 | struct nlattr *tb[], struct nlattr *data[], |
1221 | struct netlink_ext_ack *extack) | |
e314dbdc | 1222 | { |
7797b93b | 1223 | int err; |
e314dbdc PE |
1224 | struct net_device *peer; |
1225 | struct veth_priv *priv; | |
1226 | char ifname[IFNAMSIZ]; | |
1227 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1228 | unsigned char name_assign_type; |
3729d502 | 1229 | struct ifinfomsg *ifmp; |
81adee47 | 1230 | struct net *net; |
e314dbdc PE |
1231 | |
1232 | /* | |
1233 | * create and register peer first | |
e314dbdc | 1234 | */ |
e314dbdc PE |
1235 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1236 | struct nlattr *nla_peer; | |
1237 | ||
1238 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1239 | ifmp = nla_data(nla_peer); |
f7b12606 JP |
1240 | err = rtnl_nla_parse_ifla(peer_tb, |
1241 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
fceb6435 JB |
1242 | nla_len(nla_peer) - sizeof(struct ifinfomsg), |
1243 | NULL); | |
e314dbdc PE |
1244 | if (err < 0) |
1245 | return err; | |
1246 | ||
a8b8a889 | 1247 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1248 | if (err < 0) |
1249 | return err; | |
1250 | ||
1251 | tbp = peer_tb; | |
3729d502 PM |
1252 | } else { |
1253 | ifmp = NULL; | |
e314dbdc | 1254 | tbp = tb; |
3729d502 | 1255 | } |
e314dbdc | 1256 | |
191cdb38 | 1257 | if (ifmp && tbp[IFLA_IFNAME]) { |
e314dbdc | 1258 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1259 | name_assign_type = NET_NAME_USER; |
1260 | } else { | |
e314dbdc | 1261 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1262 | name_assign_type = NET_NAME_ENUM; |
1263 | } | |
e314dbdc | 1264 | |
81adee47 EB |
1265 | net = rtnl_link_get_net(src_net, tbp); |
1266 | if (IS_ERR(net)) | |
1267 | return PTR_ERR(net); | |
1268 | ||
5517750f | 1269 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1270 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1271 | if (IS_ERR(peer)) { |
1272 | put_net(net); | |
e314dbdc | 1273 | return PTR_ERR(peer); |
81adee47 | 1274 | } |
e314dbdc | 1275 | |
191cdb38 | 1276 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1277 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1278 | |
1279 | if (ifmp && (dev->ifindex != 0)) | |
1280 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1281 | |
72d24955 SH |
1282 | peer->gso_max_size = dev->gso_max_size; |
1283 | peer->gso_max_segs = dev->gso_max_segs; | |
1284 | ||
e314dbdc | 1285 | err = register_netdevice(peer); |
81adee47 EB |
1286 | put_net(net); |
1287 | net = NULL; | |
e314dbdc PE |
1288 | if (err < 0) |
1289 | goto err_register_peer; | |
1290 | ||
1291 | netif_carrier_off(peer); | |
1292 | ||
3729d502 PM |
1293 | err = rtnl_configure_link(peer, ifmp); |
1294 | if (err < 0) | |
1295 | goto err_configure_peer; | |
1296 | ||
e314dbdc PE |
1297 | /* |
1298 | * register dev last | |
1299 | * | |
1300 | * note, that since we've registered new device the dev's name | |
1301 | * should be re-allocated | |
1302 | */ | |
1303 | ||
1304 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1305 | eth_hw_addr_random(dev); |
e314dbdc | 1306 | |
6c8c4446 JP |
1307 | if (tb[IFLA_IFNAME]) |
1308 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
1309 | else | |
1310 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1311 | ||
e314dbdc PE |
1312 | err = register_netdevice(dev); |
1313 | if (err < 0) | |
1314 | goto err_register_dev; | |
1315 | ||
1316 | netif_carrier_off(dev); | |
1317 | ||
1318 | /* | |
1319 | * tie the deviced together | |
1320 | */ | |
1321 | ||
1322 | priv = netdev_priv(dev); | |
d0e2c55e | 1323 | rcu_assign_pointer(priv->peer, peer); |
e314dbdc PE |
1324 | |
1325 | priv = netdev_priv(peer); | |
d0e2c55e | 1326 | rcu_assign_pointer(priv->peer, dev); |
948d4f21 | 1327 | |
e314dbdc PE |
1328 | return 0; |
1329 | ||
1330 | err_register_dev: | |
1331 | /* nothing to do */ | |
3729d502 | 1332 | err_configure_peer: |
e314dbdc PE |
1333 | unregister_netdevice(peer); |
1334 | return err; | |
1335 | ||
1336 | err_register_peer: | |
1337 | free_netdev(peer); | |
1338 | return err; | |
1339 | } | |
1340 | ||
23289a37 | 1341 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1342 | { |
1343 | struct veth_priv *priv; | |
1344 | struct net_device *peer; | |
1345 | ||
1346 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1347 | peer = rtnl_dereference(priv->peer); |
1348 | ||
1349 | /* Note : dellink() is called from default_device_exit_batch(), | |
1350 | * before a rcu_synchronize() point. The devices are guaranteed | |
1351 | * not being freed before one RCU grace period. | |
1352 | */ | |
1353 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1354 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1355 | |
1356 | if (peer) { | |
1357 | priv = netdev_priv(peer); | |
1358 | RCU_INIT_POINTER(priv->peer, NULL); | |
1359 | unregister_netdevice_queue(peer, head); | |
1360 | } | |
e314dbdc PE |
1361 | } |
1362 | ||
23711438 TG |
1363 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
1364 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
1365 | }; | |
e314dbdc | 1366 | |
e5f4e7b9 ND |
1367 | static struct net *veth_get_link_net(const struct net_device *dev) |
1368 | { | |
1369 | struct veth_priv *priv = netdev_priv(dev); | |
1370 | struct net_device *peer = rtnl_dereference(priv->peer); | |
1371 | ||
1372 | return peer ? dev_net(peer) : dev_net(dev); | |
1373 | } | |
1374 | ||
e314dbdc PE |
1375 | static struct rtnl_link_ops veth_link_ops = { |
1376 | .kind = DRV_NAME, | |
1377 | .priv_size = sizeof(struct veth_priv), | |
1378 | .setup = veth_setup, | |
1379 | .validate = veth_validate, | |
1380 | .newlink = veth_newlink, | |
1381 | .dellink = veth_dellink, | |
1382 | .policy = veth_policy, | |
1383 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 1384 | .get_link_net = veth_get_link_net, |
e314dbdc PE |
1385 | }; |
1386 | ||
1387 | /* | |
1388 | * init/fini | |
1389 | */ | |
1390 | ||
1391 | static __init int veth_init(void) | |
1392 | { | |
1393 | return rtnl_link_register(&veth_link_ops); | |
1394 | } | |
1395 | ||
1396 | static __exit void veth_exit(void) | |
1397 | { | |
68365458 | 1398 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
1399 | } |
1400 | ||
1401 | module_init(veth_init); | |
1402 | module_exit(veth_exit); | |
1403 | ||
1404 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
1405 | MODULE_LICENSE("GPL v2"); | |
1406 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |