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 | ||
9cda7807 TM |
37 | #define VETH_XDP_TX_BULK_SIZE 16 |
38 | ||
65780c56 | 39 | struct veth_stats { |
1c5b82e5 LB |
40 | u64 rx_drops; |
41 | /* xdp */ | |
65780c56 LB |
42 | u64 xdp_packets; |
43 | u64 xdp_bytes; | |
1c5b82e5 | 44 | u64 xdp_redirect; |
65780c56 | 45 | u64 xdp_drops; |
1c5b82e5 | 46 | u64 xdp_tx; |
9152cff0 | 47 | u64 xdp_tx_err; |
5fe6e567 LB |
48 | u64 peer_tq_xdp_xmit; |
49 | u64 peer_tq_xdp_xmit_err; | |
65780c56 LB |
50 | }; |
51 | ||
4195e54a | 52 | struct veth_rq_stats { |
65780c56 | 53 | struct veth_stats vs; |
4195e54a TM |
54 | struct u64_stats_sync syncp; |
55 | }; | |
56 | ||
638264dc | 57 | struct veth_rq { |
948d4f21 TM |
58 | struct napi_struct xdp_napi; |
59 | struct net_device *dev; | |
60 | struct bpf_prog __rcu *xdp_prog; | |
d1396004 | 61 | struct xdp_mem_info xdp_mem; |
4195e54a | 62 | struct veth_rq_stats stats; |
948d4f21 TM |
63 | bool rx_notify_masked; |
64 | struct ptr_ring xdp_ring; | |
65 | struct xdp_rxq_info xdp_rxq; | |
e314dbdc PE |
66 | }; |
67 | ||
638264dc TM |
68 | struct veth_priv { |
69 | struct net_device __rcu *peer; | |
70 | atomic64_t dropped; | |
71 | struct bpf_prog *_xdp_prog; | |
72 | struct veth_rq *rq; | |
73 | unsigned int requested_headroom; | |
74 | }; | |
75 | ||
9cda7807 TM |
76 | struct veth_xdp_tx_bq { |
77 | struct xdp_frame *q[VETH_XDP_TX_BULK_SIZE]; | |
78 | unsigned int count; | |
79 | }; | |
80 | ||
e314dbdc PE |
81 | /* |
82 | * ethtool interface | |
83 | */ | |
84 | ||
d397b968 TM |
85 | struct veth_q_stat_desc { |
86 | char desc[ETH_GSTRING_LEN]; | |
87 | size_t offset; | |
88 | }; | |
89 | ||
65780c56 | 90 | #define VETH_RQ_STAT(m) offsetof(struct veth_stats, m) |
d397b968 TM |
91 | |
92 | static const struct veth_q_stat_desc veth_rq_stats_desc[] = { | |
93 | { "xdp_packets", VETH_RQ_STAT(xdp_packets) }, | |
94 | { "xdp_bytes", VETH_RQ_STAT(xdp_bytes) }, | |
5fe6e567 LB |
95 | { "drops", VETH_RQ_STAT(rx_drops) }, |
96 | { "xdp_redirect", VETH_RQ_STAT(xdp_redirect) }, | |
97 | { "xdp_drops", VETH_RQ_STAT(xdp_drops) }, | |
98 | { "xdp_tx", VETH_RQ_STAT(xdp_tx) }, | |
99 | { "xdp_tx_errors", VETH_RQ_STAT(xdp_tx_err) }, | |
d397b968 TM |
100 | }; |
101 | ||
102 | #define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc) | |
103 | ||
5fe6e567 LB |
104 | static const struct veth_q_stat_desc veth_tq_stats_desc[] = { |
105 | { "xdp_xmit", VETH_RQ_STAT(peer_tq_xdp_xmit) }, | |
106 | { "xdp_xmit_errors", VETH_RQ_STAT(peer_tq_xdp_xmit_err) }, | |
107 | }; | |
108 | ||
109 | #define VETH_TQ_STATS_LEN ARRAY_SIZE(veth_tq_stats_desc) | |
110 | ||
e314dbdc PE |
111 | static struct { |
112 | const char string[ETH_GSTRING_LEN]; | |
113 | } ethtool_stats_keys[] = { | |
114 | { "peer_ifindex" }, | |
115 | }; | |
116 | ||
56607b98 PR |
117 | static int veth_get_link_ksettings(struct net_device *dev, |
118 | struct ethtool_link_ksettings *cmd) | |
e314dbdc | 119 | { |
56607b98 PR |
120 | cmd->base.speed = SPEED_10000; |
121 | cmd->base.duplex = DUPLEX_FULL; | |
122 | cmd->base.port = PORT_TP; | |
123 | cmd->base.autoneg = AUTONEG_DISABLE; | |
e314dbdc PE |
124 | return 0; |
125 | } | |
126 | ||
127 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
128 | { | |
33a5ba14 RJ |
129 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
130 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
e314dbdc PE |
131 | } |
132 | ||
133 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
134 | { | |
d397b968 TM |
135 | char *p = (char *)buf; |
136 | int i, j; | |
137 | ||
e314dbdc PE |
138 | switch(stringset) { |
139 | case ETH_SS_STATS: | |
d397b968 TM |
140 | memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
141 | p += sizeof(ethtool_stats_keys); | |
142 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
143 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
abdf47aa | 144 | snprintf(p, ETH_GSTRING_LEN, |
9152cff0 | 145 | "rx_queue_%u_%.18s", |
d397b968 TM |
146 | i, veth_rq_stats_desc[j].desc); |
147 | p += ETH_GSTRING_LEN; | |
148 | } | |
149 | } | |
5fe6e567 LB |
150 | for (i = 0; i < dev->real_num_tx_queues; i++) { |
151 | for (j = 0; j < VETH_TQ_STATS_LEN; j++) { | |
152 | snprintf(p, ETH_GSTRING_LEN, | |
153 | "tx_queue_%u_%.18s", | |
154 | i, veth_tq_stats_desc[j].desc); | |
155 | p += ETH_GSTRING_LEN; | |
156 | } | |
157 | } | |
e314dbdc PE |
158 | break; |
159 | } | |
160 | } | |
161 | ||
b9f2c044 | 162 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 163 | { |
b9f2c044 JG |
164 | switch (sset) { |
165 | case ETH_SS_STATS: | |
d397b968 | 166 | return ARRAY_SIZE(ethtool_stats_keys) + |
5fe6e567 LB |
167 | VETH_RQ_STATS_LEN * dev->real_num_rx_queues + |
168 | VETH_TQ_STATS_LEN * dev->real_num_tx_queues; | |
b9f2c044 JG |
169 | default: |
170 | return -EOPNOTSUPP; | |
171 | } | |
e314dbdc PE |
172 | } |
173 | ||
174 | static void veth_get_ethtool_stats(struct net_device *dev, | |
175 | struct ethtool_stats *stats, u64 *data) | |
176 | { | |
5fe6e567 | 177 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); |
d0e2c55e | 178 | struct net_device *peer = rtnl_dereference(priv->peer); |
d397b968 | 179 | int i, j, idx; |
e314dbdc | 180 | |
d0e2c55e | 181 | data[0] = peer ? peer->ifindex : 0; |
d397b968 TM |
182 | idx = 1; |
183 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
184 | const struct veth_rq_stats *rq_stats = &priv->rq[i].stats; | |
65780c56 | 185 | const void *stats_base = (void *)&rq_stats->vs; |
d397b968 TM |
186 | unsigned int start; |
187 | size_t offset; | |
188 | ||
189 | do { | |
190 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
191 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
192 | offset = veth_rq_stats_desc[j].offset; | |
193 | data[idx + j] = *(u64 *)(stats_base + offset); | |
194 | } | |
195 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
196 | idx += VETH_RQ_STATS_LEN; | |
197 | } | |
5fe6e567 LB |
198 | |
199 | if (!peer) | |
200 | return; | |
201 | ||
202 | rcv_priv = netdev_priv(peer); | |
203 | for (i = 0; i < peer->real_num_rx_queues; i++) { | |
204 | const struct veth_rq_stats *rq_stats = &rcv_priv->rq[i].stats; | |
205 | const void *base = (void *)&rq_stats->vs; | |
206 | unsigned int start, tx_idx = idx; | |
207 | size_t offset; | |
208 | ||
209 | tx_idx += (i % dev->real_num_tx_queues) * VETH_TQ_STATS_LEN; | |
210 | do { | |
211 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
212 | for (j = 0; j < VETH_TQ_STATS_LEN; j++) { | |
213 | offset = veth_tq_stats_desc[j].offset; | |
214 | data[tx_idx + j] += *(u64 *)(base + offset); | |
215 | } | |
216 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
217 | } | |
e314dbdc PE |
218 | } |
219 | ||
0fc0b732 | 220 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
221 | .get_drvinfo = veth_get_drvinfo, |
222 | .get_link = ethtool_op_get_link, | |
e314dbdc | 223 | .get_strings = veth_get_strings, |
b9f2c044 | 224 | .get_sset_count = veth_get_sset_count, |
e314dbdc | 225 | .get_ethtool_stats = veth_get_ethtool_stats, |
56607b98 | 226 | .get_link_ksettings = veth_get_link_ksettings, |
056b21fb | 227 | .get_ts_info = ethtool_op_get_ts_info, |
e314dbdc PE |
228 | }; |
229 | ||
948d4f21 TM |
230 | /* general routines */ |
231 | ||
9fc8d518 TM |
232 | static bool veth_is_xdp_frame(void *ptr) |
233 | { | |
234 | return (unsigned long)ptr & VETH_XDP_FLAG; | |
235 | } | |
236 | ||
237 | static void *veth_ptr_to_xdp(void *ptr) | |
238 | { | |
239 | return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG); | |
240 | } | |
241 | ||
af87a3aa TM |
242 | static void *veth_xdp_to_ptr(void *ptr) |
243 | { | |
244 | return (void *)((unsigned long)ptr | VETH_XDP_FLAG); | |
245 | } | |
246 | ||
9fc8d518 TM |
247 | static void veth_ptr_free(void *ptr) |
248 | { | |
249 | if (veth_is_xdp_frame(ptr)) | |
250 | xdp_return_frame(veth_ptr_to_xdp(ptr)); | |
251 | else | |
252 | kfree_skb(ptr); | |
253 | } | |
254 | ||
638264dc | 255 | static void __veth_xdp_flush(struct veth_rq *rq) |
948d4f21 TM |
256 | { |
257 | /* Write ptr_ring before reading rx_notify_masked */ | |
258 | smp_mb(); | |
638264dc TM |
259 | if (!rq->rx_notify_masked) { |
260 | rq->rx_notify_masked = true; | |
261 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
262 | } |
263 | } | |
264 | ||
638264dc | 265 | static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb) |
948d4f21 | 266 | { |
638264dc | 267 | if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) { |
948d4f21 TM |
268 | dev_kfree_skb_any(skb); |
269 | return NET_RX_DROP; | |
270 | } | |
271 | ||
272 | return NET_RX_SUCCESS; | |
273 | } | |
274 | ||
638264dc TM |
275 | static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, |
276 | struct veth_rq *rq, bool xdp) | |
e314dbdc | 277 | { |
948d4f21 | 278 | return __dev_forward_skb(dev, skb) ?: xdp ? |
638264dc | 279 | veth_xdp_rx(rq, skb) : |
948d4f21 TM |
280 | netif_rx(skb); |
281 | } | |
282 | ||
283 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) | |
284 | { | |
285 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
638264dc | 286 | struct veth_rq *rq = NULL; |
d0e2c55e | 287 | struct net_device *rcv; |
2681128f | 288 | int length = skb->len; |
948d4f21 | 289 | bool rcv_xdp = false; |
638264dc | 290 | int rxq; |
e314dbdc | 291 | |
d0e2c55e ED |
292 | rcu_read_lock(); |
293 | rcv = rcu_dereference(priv->peer); | |
294 | if (unlikely(!rcv)) { | |
295 | kfree_skb(skb); | |
296 | goto drop; | |
297 | } | |
e314dbdc | 298 | |
948d4f21 | 299 | rcv_priv = netdev_priv(rcv); |
638264dc TM |
300 | rxq = skb_get_queue_mapping(skb); |
301 | if (rxq < rcv->real_num_rx_queues) { | |
302 | rq = &rcv_priv->rq[rxq]; | |
303 | rcv_xdp = rcu_access_pointer(rq->xdp_prog); | |
304 | if (rcv_xdp) | |
305 | skb_record_rx_queue(skb, rxq); | |
306 | } | |
948d4f21 | 307 | |
aa4e689e | 308 | skb_tx_timestamp(skb); |
638264dc | 309 | if (likely(veth_forward_skb(rcv, skb, rq, rcv_xdp) == NET_RX_SUCCESS)) { |
b4fba476 ED |
310 | if (!rcv_xdp) |
311 | dev_lstats_add(dev, length); | |
2681128f | 312 | } else { |
d0e2c55e | 313 | drop: |
2681128f ED |
314 | atomic64_inc(&priv->dropped); |
315 | } | |
948d4f21 TM |
316 | |
317 | if (rcv_xdp) | |
638264dc | 318 | __veth_xdp_flush(rq); |
948d4f21 | 319 | |
d0e2c55e | 320 | rcu_read_unlock(); |
948d4f21 | 321 | |
6ed10654 | 322 | return NETDEV_TX_OK; |
e314dbdc PE |
323 | } |
324 | ||
b4fba476 | 325 | static u64 veth_stats_tx(struct net_device *dev, u64 *packets, u64 *bytes) |
e314dbdc | 326 | { |
cf05c700 | 327 | struct veth_priv *priv = netdev_priv(dev); |
cf05c700 | 328 | |
b4fba476 | 329 | dev_lstats_read(dev, packets, bytes); |
2681128f ED |
330 | return atomic64_read(&priv->dropped); |
331 | } | |
332 | ||
65780c56 | 333 | static void veth_stats_rx(struct veth_stats *result, struct net_device *dev) |
4195e54a TM |
334 | { |
335 | struct veth_priv *priv = netdev_priv(dev); | |
336 | int i; | |
337 | ||
5fe6e567 | 338 | result->peer_tq_xdp_xmit_err = 0; |
4195e54a | 339 | result->xdp_packets = 0; |
d99a7c2f | 340 | result->xdp_tx_err = 0; |
4195e54a | 341 | result->xdp_bytes = 0; |
66fe4a07 | 342 | result->rx_drops = 0; |
4195e54a | 343 | for (i = 0; i < dev->num_rx_queues; i++) { |
5fe6e567 | 344 | u64 packets, bytes, drops, xdp_tx_err, peer_tq_xdp_xmit_err; |
4195e54a | 345 | struct veth_rq_stats *stats = &priv->rq[i].stats; |
4195e54a TM |
346 | unsigned int start; |
347 | ||
348 | do { | |
349 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
5fe6e567 | 350 | peer_tq_xdp_xmit_err = stats->vs.peer_tq_xdp_xmit_err; |
d99a7c2f | 351 | xdp_tx_err = stats->vs.xdp_tx_err; |
65780c56 LB |
352 | packets = stats->vs.xdp_packets; |
353 | bytes = stats->vs.xdp_bytes; | |
66fe4a07 | 354 | drops = stats->vs.rx_drops; |
4195e54a | 355 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
5fe6e567 | 356 | result->peer_tq_xdp_xmit_err += peer_tq_xdp_xmit_err; |
d99a7c2f | 357 | result->xdp_tx_err += xdp_tx_err; |
4195e54a TM |
358 | result->xdp_packets += packets; |
359 | result->xdp_bytes += bytes; | |
66fe4a07 | 360 | result->rx_drops += drops; |
4195e54a TM |
361 | } |
362 | } | |
363 | ||
bc1f4470 | 364 | static void veth_get_stats64(struct net_device *dev, |
365 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
366 | { |
367 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 368 | struct net_device *peer; |
65780c56 | 369 | struct veth_stats rx; |
b4fba476 | 370 | u64 packets, bytes; |
4195e54a | 371 | |
b4fba476 ED |
372 | tot->tx_dropped = veth_stats_tx(dev, &packets, &bytes); |
373 | tot->tx_bytes = bytes; | |
374 | tot->tx_packets = packets; | |
2681128f | 375 | |
4195e54a | 376 | veth_stats_rx(&rx, dev); |
5fe6e567 LB |
377 | tot->tx_dropped += rx.xdp_tx_err; |
378 | tot->rx_dropped = rx.rx_drops + rx.peer_tq_xdp_xmit_err; | |
4195e54a TM |
379 | tot->rx_bytes = rx.xdp_bytes; |
380 | tot->rx_packets = rx.xdp_packets; | |
2681128f | 381 | |
d0e2c55e ED |
382 | rcu_read_lock(); |
383 | peer = rcu_dereference(priv->peer); | |
384 | if (peer) { | |
e25d5dbc | 385 | veth_stats_tx(peer, &packets, &bytes); |
b4fba476 ED |
386 | tot->rx_bytes += bytes; |
387 | tot->rx_packets += packets; | |
4195e54a TM |
388 | |
389 | veth_stats_rx(&rx, peer); | |
5fe6e567 LB |
390 | tot->tx_dropped += rx.peer_tq_xdp_xmit_err; |
391 | tot->rx_dropped += rx.xdp_tx_err; | |
4195e54a TM |
392 | tot->tx_bytes += rx.xdp_bytes; |
393 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
394 | } |
395 | rcu_read_unlock(); | |
e314dbdc PE |
396 | } |
397 | ||
5c70ef85 G |
398 | /* fake multicast ability */ |
399 | static void veth_set_multicast_list(struct net_device *dev) | |
400 | { | |
401 | } | |
402 | ||
948d4f21 TM |
403 | static struct sk_buff *veth_build_skb(void *head, int headroom, int len, |
404 | int buflen) | |
405 | { | |
406 | struct sk_buff *skb; | |
407 | ||
948d4f21 TM |
408 | skb = build_skb(head, buflen); |
409 | if (!skb) | |
410 | return NULL; | |
411 | ||
412 | skb_reserve(skb, headroom); | |
413 | skb_put(skb, len); | |
414 | ||
415 | return skb; | |
416 | } | |
417 | ||
638264dc TM |
418 | static int veth_select_rxq(struct net_device *dev) |
419 | { | |
420 | return smp_processor_id() % dev->real_num_rx_queues; | |
421 | } | |
422 | ||
af87a3aa | 423 | static int veth_xdp_xmit(struct net_device *dev, int n, |
9152cff0 LB |
424 | struct xdp_frame **frames, |
425 | u32 flags, bool ndo_xmit) | |
af87a3aa TM |
426 | { |
427 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
5fe6e567 | 428 | int i, ret = -ENXIO, drops = 0; |
af87a3aa | 429 | struct net_device *rcv; |
5fe6e567 | 430 | unsigned int max_len; |
638264dc | 431 | struct veth_rq *rq; |
af87a3aa | 432 | |
5fe6e567 | 433 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
d99a7c2f | 434 | return -EINVAL; |
af87a3aa | 435 | |
5fe6e567 | 436 | rcu_read_lock(); |
af87a3aa | 437 | rcv = rcu_dereference(priv->peer); |
5fe6e567 LB |
438 | if (unlikely(!rcv)) |
439 | goto out; | |
af87a3aa TM |
440 | |
441 | rcv_priv = netdev_priv(rcv); | |
5fe6e567 | 442 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
af87a3aa TM |
443 | /* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive |
444 | * side. This means an XDP program is loaded on the peer and the peer | |
445 | * device is up. | |
446 | */ | |
5fe6e567 LB |
447 | if (!rcu_access_pointer(rq->xdp_prog)) |
448 | goto out; | |
af87a3aa TM |
449 | |
450 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; | |
451 | ||
638264dc | 452 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
453 | for (i = 0; i < n; i++) { |
454 | struct xdp_frame *frame = frames[i]; | |
455 | void *ptr = veth_xdp_to_ptr(frame); | |
456 | ||
457 | if (unlikely(frame->len > max_len || | |
638264dc | 458 | __ptr_ring_produce(&rq->xdp_ring, ptr))) { |
af87a3aa TM |
459 | xdp_return_frame_rx_napi(frame); |
460 | drops++; | |
461 | } | |
462 | } | |
638264dc | 463 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
464 | |
465 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 466 | __veth_xdp_flush(rq); |
af87a3aa | 467 | |
d99a7c2f | 468 | ret = n - drops; |
9152cff0 | 469 | if (ndo_xmit) { |
5fe6e567 LB |
470 | u64_stats_update_begin(&rq->stats.syncp); |
471 | rq->stats.vs.peer_tq_xdp_xmit += n - drops; | |
472 | rq->stats.vs.peer_tq_xdp_xmit_err += drops; | |
473 | u64_stats_update_end(&rq->stats.syncp); | |
9152cff0 | 474 | } |
9152cff0 | 475 | |
5fe6e567 | 476 | out: |
b23bfa56 | 477 | rcu_read_unlock(); |
2131479d TM |
478 | |
479 | return ret; | |
af87a3aa TM |
480 | } |
481 | ||
9152cff0 LB |
482 | static int veth_ndo_xdp_xmit(struct net_device *dev, int n, |
483 | struct xdp_frame **frames, u32 flags) | |
484 | { | |
5fe6e567 LB |
485 | int err; |
486 | ||
487 | err = veth_xdp_xmit(dev, n, frames, flags, true); | |
488 | if (err < 0) { | |
489 | struct veth_priv *priv = netdev_priv(dev); | |
490 | ||
491 | atomic64_add(n, &priv->dropped); | |
492 | } | |
493 | ||
494 | return err; | |
9152cff0 LB |
495 | } |
496 | ||
bd32aa1f | 497 | static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
9cda7807 TM |
498 | { |
499 | int sent, i, err = 0; | |
500 | ||
bd32aa1f | 501 | sent = veth_xdp_xmit(rq->dev, bq->count, bq->q, 0, false); |
9cda7807 TM |
502 | if (sent < 0) { |
503 | err = sent; | |
504 | sent = 0; | |
505 | for (i = 0; i < bq->count; i++) | |
506 | xdp_return_frame(bq->q[i]); | |
507 | } | |
bd32aa1f | 508 | trace_xdp_bulk_tx(rq->dev, sent, bq->count - sent, err); |
9cda7807 | 509 | |
5fe6e567 LB |
510 | u64_stats_update_begin(&rq->stats.syncp); |
511 | rq->stats.vs.xdp_tx += sent; | |
512 | rq->stats.vs.xdp_tx_err += bq->count - sent; | |
513 | u64_stats_update_end(&rq->stats.syncp); | |
514 | ||
9cda7807 TM |
515 | bq->count = 0; |
516 | } | |
517 | ||
bd32aa1f | 518 | static void veth_xdp_flush(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
d1396004 | 519 | { |
bd32aa1f | 520 | struct veth_priv *rcv_priv, *priv = netdev_priv(rq->dev); |
d1396004 | 521 | struct net_device *rcv; |
bd32aa1f | 522 | struct veth_rq *rcv_rq; |
d1396004 TM |
523 | |
524 | rcu_read_lock(); | |
bd32aa1f | 525 | veth_xdp_flush_bq(rq, bq); |
d1396004 TM |
526 | rcv = rcu_dereference(priv->peer); |
527 | if (unlikely(!rcv)) | |
528 | goto out; | |
529 | ||
530 | rcv_priv = netdev_priv(rcv); | |
bd32aa1f | 531 | rcv_rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 532 | /* xdp_ring is initialized on receive side? */ |
bd32aa1f | 533 | if (unlikely(!rcu_access_pointer(rcv_rq->xdp_prog))) |
d1396004 TM |
534 | goto out; |
535 | ||
bd32aa1f | 536 | __veth_xdp_flush(rcv_rq); |
d1396004 TM |
537 | out: |
538 | rcu_read_unlock(); | |
539 | } | |
540 | ||
bd32aa1f | 541 | static int veth_xdp_tx(struct veth_rq *rq, struct xdp_buff *xdp, |
9cda7807 | 542 | struct veth_xdp_tx_bq *bq) |
d1396004 | 543 | { |
1b698fa5 | 544 | struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp); |
d1396004 TM |
545 | |
546 | if (unlikely(!frame)) | |
547 | return -EOVERFLOW; | |
548 | ||
9cda7807 | 549 | if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE)) |
bd32aa1f | 550 | veth_xdp_flush_bq(rq, bq); |
9cda7807 TM |
551 | |
552 | bq->q[bq->count++] = frame; | |
553 | ||
554 | return 0; | |
d1396004 TM |
555 | } |
556 | ||
638264dc | 557 | static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, |
d1396004 | 558 | struct xdp_frame *frame, |
1c5b82e5 LB |
559 | struct veth_xdp_tx_bq *bq, |
560 | struct veth_stats *stats) | |
9fc8d518 TM |
561 | { |
562 | void *hard_start = frame->data - frame->headroom; | |
9fc8d518 | 563 | int len = frame->len, delta = 0; |
d1396004 | 564 | struct xdp_frame orig_frame; |
9fc8d518 TM |
565 | struct bpf_prog *xdp_prog; |
566 | unsigned int headroom; | |
567 | struct sk_buff *skb; | |
568 | ||
5c857225 JDB |
569 | /* bpf_xdp_adjust_head() assures BPF cannot access xdp_frame area */ |
570 | hard_start -= sizeof(struct xdp_frame); | |
571 | ||
9fc8d518 | 572 | rcu_read_lock(); |
638264dc | 573 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 TM |
574 | if (likely(xdp_prog)) { |
575 | struct xdp_buff xdp; | |
576 | u32 act; | |
577 | ||
fc379872 | 578 | xdp_convert_frame_to_buff(frame, &xdp); |
638264dc | 579 | xdp.rxq = &rq->xdp_rxq; |
9fc8d518 TM |
580 | |
581 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
582 | ||
583 | switch (act) { | |
584 | case XDP_PASS: | |
585 | delta = frame->data - xdp.data; | |
586 | len = xdp.data_end - xdp.data; | |
587 | break; | |
d1396004 TM |
588 | case XDP_TX: |
589 | orig_frame = *frame; | |
d1396004 | 590 | xdp.rxq->mem = frame->mem; |
bd32aa1f | 591 | if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) { |
638264dc | 592 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 | 593 | frame = &orig_frame; |
1c5b82e5 | 594 | stats->rx_drops++; |
d1396004 TM |
595 | goto err_xdp; |
596 | } | |
1c5b82e5 | 597 | stats->xdp_tx++; |
d1396004 TM |
598 | rcu_read_unlock(); |
599 | goto xdp_xmit; | |
600 | case XDP_REDIRECT: | |
601 | orig_frame = *frame; | |
d1396004 | 602 | xdp.rxq->mem = frame->mem; |
638264dc | 603 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
d1396004 | 604 | frame = &orig_frame; |
1c5b82e5 | 605 | stats->rx_drops++; |
d1396004 TM |
606 | goto err_xdp; |
607 | } | |
1c5b82e5 | 608 | stats->xdp_redirect++; |
d1396004 TM |
609 | rcu_read_unlock(); |
610 | goto xdp_xmit; | |
9fc8d518 TM |
611 | default: |
612 | bpf_warn_invalid_xdp_action(act); | |
df561f66 | 613 | fallthrough; |
9fc8d518 | 614 | case XDP_ABORTED: |
638264dc | 615 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 616 | fallthrough; |
9fc8d518 | 617 | case XDP_DROP: |
1c5b82e5 | 618 | stats->xdp_drops++; |
9fc8d518 TM |
619 | goto err_xdp; |
620 | } | |
621 | } | |
622 | rcu_read_unlock(); | |
623 | ||
624 | headroom = sizeof(struct xdp_frame) + frame->headroom - delta; | |
45a9e6d8 | 625 | skb = veth_build_skb(hard_start, headroom, len, frame->frame_sz); |
9fc8d518 TM |
626 | if (!skb) { |
627 | xdp_return_frame(frame); | |
1c5b82e5 | 628 | stats->rx_drops++; |
9fc8d518 TM |
629 | goto err; |
630 | } | |
631 | ||
cbf33510 | 632 | xdp_release_frame(frame); |
9fc8d518 | 633 | xdp_scrub_frame(frame); |
638264dc | 634 | skb->protocol = eth_type_trans(skb, rq->dev); |
9fc8d518 TM |
635 | err: |
636 | return skb; | |
637 | err_xdp: | |
638 | rcu_read_unlock(); | |
639 | xdp_return_frame(frame); | |
d1396004 | 640 | xdp_xmit: |
9fc8d518 TM |
641 | return NULL; |
642 | } | |
643 | ||
1c5b82e5 LB |
644 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, |
645 | struct sk_buff *skb, | |
646 | struct veth_xdp_tx_bq *bq, | |
647 | struct veth_stats *stats) | |
948d4f21 TM |
648 | { |
649 | u32 pktlen, headroom, act, metalen; | |
650 | void *orig_data, *orig_data_end; | |
651 | struct bpf_prog *xdp_prog; | |
652 | int mac_len, delta, off; | |
653 | struct xdp_buff xdp; | |
654 | ||
4bf9ffa0 TM |
655 | skb_orphan(skb); |
656 | ||
948d4f21 | 657 | rcu_read_lock(); |
638264dc | 658 | xdp_prog = rcu_dereference(rq->xdp_prog); |
948d4f21 TM |
659 | if (unlikely(!xdp_prog)) { |
660 | rcu_read_unlock(); | |
661 | goto out; | |
662 | } | |
663 | ||
664 | mac_len = skb->data - skb_mac_header(skb); | |
665 | pktlen = skb->len + mac_len; | |
666 | headroom = skb_headroom(skb) - mac_len; | |
667 | ||
668 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
669 | skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) { | |
670 | struct sk_buff *nskb; | |
671 | int size, head_off; | |
672 | void *head, *start; | |
673 | struct page *page; | |
674 | ||
675 | size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) + | |
676 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
677 | if (size > PAGE_SIZE) | |
678 | goto drop; | |
679 | ||
680 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | |
681 | if (!page) | |
682 | goto drop; | |
683 | ||
684 | head = page_address(page); | |
685 | start = head + VETH_XDP_HEADROOM; | |
686 | if (skb_copy_bits(skb, -mac_len, start, pktlen)) { | |
687 | page_frag_free(head); | |
688 | goto drop; | |
689 | } | |
690 | ||
45a9e6d8 JDB |
691 | nskb = veth_build_skb(head, VETH_XDP_HEADROOM + mac_len, |
692 | skb->len, PAGE_SIZE); | |
948d4f21 TM |
693 | if (!nskb) { |
694 | page_frag_free(head); | |
695 | goto drop; | |
696 | } | |
697 | ||
698 | skb_copy_header(nskb, skb); | |
699 | head_off = skb_headroom(nskb) - skb_headroom(skb); | |
700 | skb_headers_offset_update(nskb, head_off); | |
948d4f21 TM |
701 | consume_skb(skb); |
702 | skb = nskb; | |
703 | } | |
704 | ||
705 | xdp.data_hard_start = skb->head; | |
706 | xdp.data = skb_mac_header(skb); | |
707 | xdp.data_end = xdp.data + pktlen; | |
708 | xdp.data_meta = xdp.data; | |
638264dc | 709 | xdp.rxq = &rq->xdp_rxq; |
45a9e6d8 JDB |
710 | |
711 | /* SKB "head" area always have tailroom for skb_shared_info */ | |
712 | xdp.frame_sz = (void *)skb_end_pointer(skb) - xdp.data_hard_start; | |
713 | xdp.frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
714 | ||
948d4f21 TM |
715 | orig_data = xdp.data; |
716 | orig_data_end = xdp.data_end; | |
717 | ||
718 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
719 | ||
720 | switch (act) { | |
721 | case XDP_PASS: | |
722 | break; | |
d1396004 TM |
723 | case XDP_TX: |
724 | get_page(virt_to_page(xdp.data)); | |
725 | consume_skb(skb); | |
638264dc | 726 | xdp.rxq->mem = rq->xdp_mem; |
bd32aa1f | 727 | if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) { |
638264dc | 728 | trace_xdp_exception(rq->dev, xdp_prog, act); |
1c5b82e5 | 729 | stats->rx_drops++; |
d1396004 TM |
730 | goto err_xdp; |
731 | } | |
1c5b82e5 | 732 | stats->xdp_tx++; |
d1396004 TM |
733 | rcu_read_unlock(); |
734 | goto xdp_xmit; | |
735 | case XDP_REDIRECT: | |
736 | get_page(virt_to_page(xdp.data)); | |
737 | consume_skb(skb); | |
638264dc | 738 | xdp.rxq->mem = rq->xdp_mem; |
1c5b82e5 LB |
739 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
740 | stats->rx_drops++; | |
d1396004 | 741 | goto err_xdp; |
1c5b82e5 LB |
742 | } |
743 | stats->xdp_redirect++; | |
d1396004 TM |
744 | rcu_read_unlock(); |
745 | goto xdp_xmit; | |
948d4f21 TM |
746 | default: |
747 | bpf_warn_invalid_xdp_action(act); | |
df561f66 | 748 | fallthrough; |
948d4f21 | 749 | case XDP_ABORTED: |
638264dc | 750 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 751 | fallthrough; |
948d4f21 | 752 | case XDP_DROP: |
1c5b82e5 LB |
753 | stats->xdp_drops++; |
754 | goto xdp_drop; | |
948d4f21 TM |
755 | } |
756 | rcu_read_unlock(); | |
757 | ||
45a9e6d8 | 758 | /* check if bpf_xdp_adjust_head was used */ |
948d4f21 TM |
759 | delta = orig_data - xdp.data; |
760 | off = mac_len + delta; | |
761 | if (off > 0) | |
762 | __skb_push(skb, off); | |
763 | else if (off < 0) | |
764 | __skb_pull(skb, -off); | |
765 | skb->mac_header -= delta; | |
45a9e6d8 JDB |
766 | |
767 | /* check if bpf_xdp_adjust_tail was used */ | |
948d4f21 TM |
768 | off = xdp.data_end - orig_data_end; |
769 | if (off != 0) | |
45a9e6d8 | 770 | __skb_put(skb, off); /* positive on grow, negative on shrink */ |
638264dc | 771 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 TM |
772 | |
773 | metalen = xdp.data - xdp.data_meta; | |
774 | if (metalen) | |
775 | skb_metadata_set(skb, metalen); | |
776 | out: | |
777 | return skb; | |
778 | drop: | |
1c5b82e5 LB |
779 | stats->rx_drops++; |
780 | xdp_drop: | |
948d4f21 TM |
781 | rcu_read_unlock(); |
782 | kfree_skb(skb); | |
783 | return NULL; | |
d1396004 TM |
784 | err_xdp: |
785 | rcu_read_unlock(); | |
786 | page_frag_free(xdp.data); | |
787 | xdp_xmit: | |
788 | return NULL; | |
948d4f21 TM |
789 | } |
790 | ||
1c5b82e5 LB |
791 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, |
792 | struct veth_xdp_tx_bq *bq, | |
793 | struct veth_stats *stats) | |
948d4f21 | 794 | { |
1c5b82e5 | 795 | int i, done = 0; |
948d4f21 TM |
796 | |
797 | for (i = 0; i < budget; i++) { | |
638264dc | 798 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
9fc8d518 | 799 | struct sk_buff *skb; |
948d4f21 | 800 | |
9fc8d518 | 801 | if (!ptr) |
948d4f21 TM |
802 | break; |
803 | ||
d1396004 | 804 | if (veth_is_xdp_frame(ptr)) { |
4195e54a TM |
805 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
806 | ||
1c5b82e5 LB |
807 | stats->xdp_bytes += frame->len; |
808 | skb = veth_xdp_rcv_one(rq, frame, bq, stats); | |
d1396004 | 809 | } else { |
4195e54a | 810 | skb = ptr; |
1c5b82e5 LB |
811 | stats->xdp_bytes += skb->len; |
812 | skb = veth_xdp_rcv_skb(rq, skb, bq, stats); | |
d1396004 | 813 | } |
948d4f21 TM |
814 | |
815 | if (skb) | |
638264dc | 816 | napi_gro_receive(&rq->xdp_napi, skb); |
948d4f21 TM |
817 | |
818 | done++; | |
819 | } | |
820 | ||
4195e54a | 821 | u64_stats_update_begin(&rq->stats.syncp); |
9152cff0 | 822 | rq->stats.vs.xdp_redirect += stats->xdp_redirect; |
1c5b82e5 | 823 | rq->stats.vs.xdp_bytes += stats->xdp_bytes; |
66fe4a07 LB |
824 | rq->stats.vs.xdp_drops += stats->xdp_drops; |
825 | rq->stats.vs.rx_drops += stats->rx_drops; | |
65780c56 | 826 | rq->stats.vs.xdp_packets += done; |
4195e54a TM |
827 | u64_stats_update_end(&rq->stats.syncp); |
828 | ||
948d4f21 TM |
829 | return done; |
830 | } | |
831 | ||
832 | static int veth_poll(struct napi_struct *napi, int budget) | |
833 | { | |
638264dc TM |
834 | struct veth_rq *rq = |
835 | container_of(napi, struct veth_rq, xdp_napi); | |
1c5b82e5 | 836 | struct veth_stats stats = {}; |
9cda7807 | 837 | struct veth_xdp_tx_bq bq; |
948d4f21 TM |
838 | int done; |
839 | ||
9cda7807 TM |
840 | bq.count = 0; |
841 | ||
d1396004 | 842 | xdp_set_return_frame_no_direct(); |
1c5b82e5 | 843 | done = veth_xdp_rcv(rq, budget, &bq, &stats); |
948d4f21 TM |
844 | |
845 | if (done < budget && napi_complete_done(napi, done)) { | |
846 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
847 | smp_store_mb(rq->rx_notify_masked, false); |
848 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
849 | rq->rx_notify_masked = true; | |
850 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
851 | } |
852 | } | |
853 | ||
1c5b82e5 | 854 | if (stats.xdp_tx > 0) |
bd32aa1f | 855 | veth_xdp_flush(rq, &bq); |
1c5b82e5 | 856 | if (stats.xdp_redirect > 0) |
1d233886 | 857 | xdp_do_flush(); |
d1396004 TM |
858 | xdp_clear_return_frame_no_direct(); |
859 | ||
948d4f21 TM |
860 | return done; |
861 | } | |
862 | ||
863 | static int veth_napi_add(struct net_device *dev) | |
864 | { | |
865 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 866 | int err, i; |
948d4f21 | 867 | |
638264dc TM |
868 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
869 | struct veth_rq *rq = &priv->rq[i]; | |
870 | ||
871 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
872 | if (err) | |
873 | goto err_xdp_ring; | |
874 | } | |
948d4f21 | 875 | |
638264dc TM |
876 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
877 | struct veth_rq *rq = &priv->rq[i]; | |
878 | ||
879 | netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT); | |
880 | napi_enable(&rq->xdp_napi); | |
881 | } | |
948d4f21 TM |
882 | |
883 | return 0; | |
638264dc TM |
884 | err_xdp_ring: |
885 | for (i--; i >= 0; i--) | |
886 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); | |
887 | ||
888 | return err; | |
948d4f21 TM |
889 | } |
890 | ||
891 | static void veth_napi_del(struct net_device *dev) | |
892 | { | |
893 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 894 | int i; |
948d4f21 | 895 | |
638264dc TM |
896 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
897 | struct veth_rq *rq = &priv->rq[i]; | |
898 | ||
899 | napi_disable(&rq->xdp_napi); | |
900 | napi_hash_del(&rq->xdp_napi); | |
901 | } | |
902 | synchronize_net(); | |
903 | ||
904 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
905 | struct veth_rq *rq = &priv->rq[i]; | |
906 | ||
907 | netif_napi_del(&rq->xdp_napi); | |
908 | rq->rx_notify_masked = false; | |
909 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
910 | } | |
948d4f21 TM |
911 | } |
912 | ||
913 | static int veth_enable_xdp(struct net_device *dev) | |
914 | { | |
915 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 916 | int err, i; |
948d4f21 | 917 | |
638264dc TM |
918 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { |
919 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
920 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 921 | |
638264dc TM |
922 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i); |
923 | if (err < 0) | |
924 | goto err_rxq_reg; | |
925 | ||
926 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
927 | MEM_TYPE_PAGE_SHARED, | |
928 | NULL); | |
929 | if (err < 0) | |
930 | goto err_reg_mem; | |
931 | ||
932 | /* Save original mem info as it can be overwritten */ | |
933 | rq->xdp_mem = rq->xdp_rxq.mem; | |
934 | } | |
948d4f21 TM |
935 | |
936 | err = veth_napi_add(dev); | |
937 | if (err) | |
638264dc | 938 | goto err_rxq_reg; |
948d4f21 TM |
939 | } |
940 | ||
638264dc TM |
941 | for (i = 0; i < dev->real_num_rx_queues; i++) |
942 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); | |
948d4f21 TM |
943 | |
944 | return 0; | |
638264dc TM |
945 | err_reg_mem: |
946 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
947 | err_rxq_reg: | |
948 | for (i--; i >= 0; i--) | |
949 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
948d4f21 TM |
950 | |
951 | return err; | |
952 | } | |
953 | ||
954 | static void veth_disable_xdp(struct net_device *dev) | |
955 | { | |
956 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 957 | int i; |
948d4f21 | 958 | |
638264dc TM |
959 | for (i = 0; i < dev->real_num_rx_queues; i++) |
960 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
948d4f21 | 961 | veth_napi_del(dev); |
638264dc TM |
962 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
963 | struct veth_rq *rq = &priv->rq[i]; | |
964 | ||
965 | rq->xdp_rxq.mem = rq->xdp_mem; | |
966 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
967 | } | |
948d4f21 TM |
968 | } |
969 | ||
e314dbdc PE |
970 | static int veth_open(struct net_device *dev) |
971 | { | |
d0e2c55e ED |
972 | struct veth_priv *priv = netdev_priv(dev); |
973 | struct net_device *peer = rtnl_dereference(priv->peer); | |
948d4f21 | 974 | int err; |
e314dbdc | 975 | |
d0e2c55e | 976 | if (!peer) |
e314dbdc PE |
977 | return -ENOTCONN; |
978 | ||
948d4f21 TM |
979 | if (priv->_xdp_prog) { |
980 | err = veth_enable_xdp(dev); | |
981 | if (err) | |
982 | return err; | |
983 | } | |
984 | ||
d0e2c55e | 985 | if (peer->flags & IFF_UP) { |
e314dbdc | 986 | netif_carrier_on(dev); |
d0e2c55e | 987 | netif_carrier_on(peer); |
e314dbdc | 988 | } |
948d4f21 | 989 | |
e314dbdc PE |
990 | return 0; |
991 | } | |
992 | ||
2cf48a10 EB |
993 | static int veth_close(struct net_device *dev) |
994 | { | |
995 | struct veth_priv *priv = netdev_priv(dev); | |
2efd32ee | 996 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
997 | |
998 | netif_carrier_off(dev); | |
2efd32ee ED |
999 | if (peer) |
1000 | netif_carrier_off(peer); | |
2cf48a10 | 1001 | |
948d4f21 TM |
1002 | if (priv->_xdp_prog) |
1003 | veth_disable_xdp(dev); | |
1004 | ||
2cf48a10 EB |
1005 | return 0; |
1006 | } | |
1007 | ||
91572088 | 1008 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 1009 | { |
91572088 | 1010 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
1011 | } |
1012 | ||
7797b93b TM |
1013 | static int veth_alloc_queues(struct net_device *dev) |
1014 | { | |
1015 | struct veth_priv *priv = netdev_priv(dev); | |
1016 | int i; | |
1017 | ||
1018 | priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL); | |
1019 | if (!priv->rq) | |
1020 | return -ENOMEM; | |
1021 | ||
4195e54a | 1022 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 1023 | priv->rq[i].dev = dev; |
4195e54a TM |
1024 | u64_stats_init(&priv->rq[i].stats.syncp); |
1025 | } | |
7797b93b TM |
1026 | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static void veth_free_queues(struct net_device *dev) | |
1031 | { | |
1032 | struct veth_priv *priv = netdev_priv(dev); | |
1033 | ||
1034 | kfree(priv->rq); | |
1035 | } | |
1036 | ||
e314dbdc PE |
1037 | static int veth_dev_init(struct net_device *dev) |
1038 | { | |
7797b93b TM |
1039 | int err; |
1040 | ||
14d73416 LR |
1041 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
1042 | if (!dev->lstats) | |
e314dbdc | 1043 | return -ENOMEM; |
7797b93b TM |
1044 | |
1045 | err = veth_alloc_queues(dev); | |
1046 | if (err) { | |
14d73416 | 1047 | free_percpu(dev->lstats); |
7797b93b TM |
1048 | return err; |
1049 | } | |
1050 | ||
e314dbdc PE |
1051 | return 0; |
1052 | } | |
1053 | ||
11687a10 DM |
1054 | static void veth_dev_free(struct net_device *dev) |
1055 | { | |
7797b93b | 1056 | veth_free_queues(dev); |
14d73416 | 1057 | free_percpu(dev->lstats); |
11687a10 DM |
1058 | } |
1059 | ||
bb446c19 WC |
1060 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1061 | static void veth_poll_controller(struct net_device *dev) | |
1062 | { | |
1063 | /* veth only receives frames when its peer sends one | |
948d4f21 | 1064 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
1065 | * never to have pending data when we poll for it so |
1066 | * there is nothing to do here. | |
1067 | * | |
1068 | * We need this though so netpoll recognizes us as an interface that | |
1069 | * supports polling, which enables bridge devices in virt setups to | |
1070 | * still use netconsole | |
1071 | */ | |
1072 | } | |
1073 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
1074 | ||
a45253bf ND |
1075 | static int veth_get_iflink(const struct net_device *dev) |
1076 | { | |
1077 | struct veth_priv *priv = netdev_priv(dev); | |
1078 | struct net_device *peer; | |
1079 | int iflink; | |
1080 | ||
1081 | rcu_read_lock(); | |
1082 | peer = rcu_dereference(priv->peer); | |
1083 | iflink = peer ? peer->ifindex : 0; | |
1084 | rcu_read_unlock(); | |
1085 | ||
1086 | return iflink; | |
1087 | } | |
1088 | ||
dc224822 TM |
1089 | static netdev_features_t veth_fix_features(struct net_device *dev, |
1090 | netdev_features_t features) | |
1091 | { | |
1092 | struct veth_priv *priv = netdev_priv(dev); | |
1093 | struct net_device *peer; | |
1094 | ||
1095 | peer = rtnl_dereference(priv->peer); | |
1096 | if (peer) { | |
1097 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1098 | ||
1099 | if (peer_priv->_xdp_prog) | |
1100 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1101 | } | |
1102 | ||
1103 | return features; | |
1104 | } | |
1105 | ||
163e5292 PA |
1106 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1107 | { | |
1108 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1109 | struct net_device *peer; | |
1110 | ||
1111 | if (new_hr < 0) | |
1112 | new_hr = 0; | |
1113 | ||
1114 | rcu_read_lock(); | |
1115 | peer = rcu_dereference(priv->peer); | |
1116 | if (unlikely(!peer)) | |
1117 | goto out; | |
1118 | ||
1119 | peer_priv = netdev_priv(peer); | |
1120 | priv->requested_headroom = new_hr; | |
1121 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1122 | dev->needed_headroom = new_hr; | |
1123 | peer->needed_headroom = new_hr; | |
1124 | ||
1125 | out: | |
1126 | rcu_read_unlock(); | |
1127 | } | |
1128 | ||
948d4f21 TM |
1129 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1130 | struct netlink_ext_ack *extack) | |
1131 | { | |
1132 | struct veth_priv *priv = netdev_priv(dev); | |
1133 | struct bpf_prog *old_prog; | |
1134 | struct net_device *peer; | |
dc224822 | 1135 | unsigned int max_mtu; |
948d4f21 TM |
1136 | int err; |
1137 | ||
1138 | old_prog = priv->_xdp_prog; | |
1139 | priv->_xdp_prog = prog; | |
1140 | peer = rtnl_dereference(priv->peer); | |
1141 | ||
1142 | if (prog) { | |
1143 | if (!peer) { | |
1144 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1145 | err = -ENOTCONN; | |
1146 | goto err; | |
1147 | } | |
1148 | ||
dc224822 TM |
1149 | max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM - |
1150 | peer->hard_header_len - | |
1151 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1152 | if (peer->mtu > max_mtu) { | |
1153 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1154 | err = -ERANGE; | |
1155 | goto err; | |
1156 | } | |
1157 | ||
638264dc TM |
1158 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1159 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1160 | err = -ENOSPC; | |
1161 | goto err; | |
1162 | } | |
1163 | ||
948d4f21 TM |
1164 | if (dev->flags & IFF_UP) { |
1165 | err = veth_enable_xdp(dev); | |
1166 | if (err) { | |
1167 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1168 | goto err; | |
1169 | } | |
1170 | } | |
dc224822 TM |
1171 | |
1172 | if (!old_prog) { | |
1173 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1174 | peer->max_mtu = max_mtu; | |
1175 | } | |
948d4f21 TM |
1176 | } |
1177 | ||
1178 | if (old_prog) { | |
dc224822 TM |
1179 | if (!prog) { |
1180 | if (dev->flags & IFF_UP) | |
1181 | veth_disable_xdp(dev); | |
1182 | ||
1183 | if (peer) { | |
1184 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1185 | peer->max_mtu = ETH_MAX_MTU; | |
1186 | } | |
1187 | } | |
948d4f21 TM |
1188 | bpf_prog_put(old_prog); |
1189 | } | |
1190 | ||
dc224822 TM |
1191 | if ((!!old_prog ^ !!prog) && peer) |
1192 | netdev_update_features(peer); | |
1193 | ||
948d4f21 TM |
1194 | return 0; |
1195 | err: | |
1196 | priv->_xdp_prog = old_prog; | |
1197 | ||
1198 | return err; | |
1199 | } | |
1200 | ||
948d4f21 TM |
1201 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
1202 | { | |
1203 | switch (xdp->command) { | |
1204 | case XDP_SETUP_PROG: | |
1205 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
948d4f21 TM |
1206 | default: |
1207 | return -EINVAL; | |
1208 | } | |
1209 | } | |
1210 | ||
4456e7bd | 1211 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1212 | .ndo_init = veth_dev_init, |
1213 | .ndo_open = veth_open, | |
2cf48a10 | 1214 | .ndo_stop = veth_close, |
ee923623 | 1215 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1216 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1217 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1218 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1219 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1220 | .ndo_poll_controller = veth_poll_controller, | |
1221 | #endif | |
a45253bf | 1222 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1223 | .ndo_fix_features = veth_fix_features, |
1a04a821 | 1224 | .ndo_features_check = passthru_features_check, |
163e5292 | 1225 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1226 | .ndo_bpf = veth_xdp, |
9152cff0 | 1227 | .ndo_xdp_xmit = veth_ndo_xdp_xmit, |
4456e7bd SH |
1228 | }; |
1229 | ||
732912d7 | 1230 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1231 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1232 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1233 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1234 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1235 | |
e314dbdc PE |
1236 | static void veth_setup(struct net_device *dev) |
1237 | { | |
1238 | ether_setup(dev); | |
1239 | ||
550fd08c | 1240 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1241 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1242 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1243 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1244 | |
4456e7bd | 1245 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
1246 | dev->ethtool_ops = &veth_ethtool_ops; |
1247 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1248 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1249 | dev->vlan_features = dev->features & |
3f8c707b VY |
1250 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1251 | NETIF_F_HW_VLAN_STAG_TX | | |
1252 | NETIF_F_HW_VLAN_CTAG_RX | | |
1253 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1254 | dev->needs_free_netdev = true; |
1255 | dev->priv_destructor = veth_dev_free; | |
91572088 | 1256 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1257 | |
8093315a | 1258 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1259 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1260 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
e314dbdc PE |
1261 | } |
1262 | ||
1263 | /* | |
1264 | * netlink interface | |
1265 | */ | |
1266 | ||
a8b8a889 MS |
1267 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1268 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1269 | { |
1270 | if (tb[IFLA_ADDRESS]) { | |
1271 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1272 | return -EINVAL; | |
1273 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1274 | return -EADDRNOTAVAIL; | |
1275 | } | |
38d40815 EB |
1276 | if (tb[IFLA_MTU]) { |
1277 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1278 | return -EINVAL; | |
1279 | } | |
e314dbdc PE |
1280 | return 0; |
1281 | } | |
1282 | ||
1283 | static struct rtnl_link_ops veth_link_ops; | |
1284 | ||
81adee47 | 1285 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1286 | struct nlattr *tb[], struct nlattr *data[], |
1287 | struct netlink_ext_ack *extack) | |
e314dbdc | 1288 | { |
7797b93b | 1289 | int err; |
e314dbdc PE |
1290 | struct net_device *peer; |
1291 | struct veth_priv *priv; | |
1292 | char ifname[IFNAMSIZ]; | |
1293 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1294 | unsigned char name_assign_type; |
3729d502 | 1295 | struct ifinfomsg *ifmp; |
81adee47 | 1296 | struct net *net; |
e314dbdc PE |
1297 | |
1298 | /* | |
1299 | * create and register peer first | |
e314dbdc | 1300 | */ |
e314dbdc PE |
1301 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1302 | struct nlattr *nla_peer; | |
1303 | ||
1304 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1305 | ifmp = nla_data(nla_peer); |
f7b12606 JP |
1306 | err = rtnl_nla_parse_ifla(peer_tb, |
1307 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
fceb6435 JB |
1308 | nla_len(nla_peer) - sizeof(struct ifinfomsg), |
1309 | NULL); | |
e314dbdc PE |
1310 | if (err < 0) |
1311 | return err; | |
1312 | ||
a8b8a889 | 1313 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1314 | if (err < 0) |
1315 | return err; | |
1316 | ||
1317 | tbp = peer_tb; | |
3729d502 PM |
1318 | } else { |
1319 | ifmp = NULL; | |
e314dbdc | 1320 | tbp = tb; |
3729d502 | 1321 | } |
e314dbdc | 1322 | |
191cdb38 | 1323 | if (ifmp && tbp[IFLA_IFNAME]) { |
e314dbdc | 1324 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1325 | name_assign_type = NET_NAME_USER; |
1326 | } else { | |
e314dbdc | 1327 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1328 | name_assign_type = NET_NAME_ENUM; |
1329 | } | |
e314dbdc | 1330 | |
81adee47 EB |
1331 | net = rtnl_link_get_net(src_net, tbp); |
1332 | if (IS_ERR(net)) | |
1333 | return PTR_ERR(net); | |
1334 | ||
5517750f | 1335 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1336 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1337 | if (IS_ERR(peer)) { |
1338 | put_net(net); | |
e314dbdc | 1339 | return PTR_ERR(peer); |
81adee47 | 1340 | } |
e314dbdc | 1341 | |
191cdb38 | 1342 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1343 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1344 | |
1345 | if (ifmp && (dev->ifindex != 0)) | |
1346 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1347 | |
72d24955 SH |
1348 | peer->gso_max_size = dev->gso_max_size; |
1349 | peer->gso_max_segs = dev->gso_max_segs; | |
1350 | ||
e314dbdc | 1351 | err = register_netdevice(peer); |
81adee47 EB |
1352 | put_net(net); |
1353 | net = NULL; | |
e314dbdc PE |
1354 | if (err < 0) |
1355 | goto err_register_peer; | |
1356 | ||
1357 | netif_carrier_off(peer); | |
1358 | ||
3729d502 PM |
1359 | err = rtnl_configure_link(peer, ifmp); |
1360 | if (err < 0) | |
1361 | goto err_configure_peer; | |
1362 | ||
e314dbdc PE |
1363 | /* |
1364 | * register dev last | |
1365 | * | |
1366 | * note, that since we've registered new device the dev's name | |
1367 | * should be re-allocated | |
1368 | */ | |
1369 | ||
1370 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1371 | eth_hw_addr_random(dev); |
e314dbdc | 1372 | |
6c8c4446 JP |
1373 | if (tb[IFLA_IFNAME]) |
1374 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
1375 | else | |
1376 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1377 | ||
e314dbdc PE |
1378 | err = register_netdevice(dev); |
1379 | if (err < 0) | |
1380 | goto err_register_dev; | |
1381 | ||
1382 | netif_carrier_off(dev); | |
1383 | ||
1384 | /* | |
1385 | * tie the deviced together | |
1386 | */ | |
1387 | ||
1388 | priv = netdev_priv(dev); | |
d0e2c55e | 1389 | rcu_assign_pointer(priv->peer, peer); |
e314dbdc PE |
1390 | |
1391 | priv = netdev_priv(peer); | |
d0e2c55e | 1392 | rcu_assign_pointer(priv->peer, dev); |
948d4f21 | 1393 | |
e314dbdc PE |
1394 | return 0; |
1395 | ||
1396 | err_register_dev: | |
1397 | /* nothing to do */ | |
3729d502 | 1398 | err_configure_peer: |
e314dbdc PE |
1399 | unregister_netdevice(peer); |
1400 | return err; | |
1401 | ||
1402 | err_register_peer: | |
1403 | free_netdev(peer); | |
1404 | return err; | |
1405 | } | |
1406 | ||
23289a37 | 1407 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1408 | { |
1409 | struct veth_priv *priv; | |
1410 | struct net_device *peer; | |
1411 | ||
1412 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1413 | peer = rtnl_dereference(priv->peer); |
1414 | ||
1415 | /* Note : dellink() is called from default_device_exit_batch(), | |
1416 | * before a rcu_synchronize() point. The devices are guaranteed | |
1417 | * not being freed before one RCU grace period. | |
1418 | */ | |
1419 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1420 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1421 | |
1422 | if (peer) { | |
1423 | priv = netdev_priv(peer); | |
1424 | RCU_INIT_POINTER(priv->peer, NULL); | |
1425 | unregister_netdevice_queue(peer, head); | |
1426 | } | |
e314dbdc PE |
1427 | } |
1428 | ||
23711438 TG |
1429 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
1430 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
1431 | }; | |
e314dbdc | 1432 | |
e5f4e7b9 ND |
1433 | static struct net *veth_get_link_net(const struct net_device *dev) |
1434 | { | |
1435 | struct veth_priv *priv = netdev_priv(dev); | |
1436 | struct net_device *peer = rtnl_dereference(priv->peer); | |
1437 | ||
1438 | return peer ? dev_net(peer) : dev_net(dev); | |
1439 | } | |
1440 | ||
e314dbdc PE |
1441 | static struct rtnl_link_ops veth_link_ops = { |
1442 | .kind = DRV_NAME, | |
1443 | .priv_size = sizeof(struct veth_priv), | |
1444 | .setup = veth_setup, | |
1445 | .validate = veth_validate, | |
1446 | .newlink = veth_newlink, | |
1447 | .dellink = veth_dellink, | |
1448 | .policy = veth_policy, | |
1449 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 1450 | .get_link_net = veth_get_link_net, |
e314dbdc PE |
1451 | }; |
1452 | ||
1453 | /* | |
1454 | * init/fini | |
1455 | */ | |
1456 | ||
1457 | static __init int veth_init(void) | |
1458 | { | |
1459 | return rtnl_link_register(&veth_link_ops); | |
1460 | } | |
1461 | ||
1462 | static __exit void veth_exit(void) | |
1463 | { | |
68365458 | 1464 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
1465 | } |
1466 | ||
1467 | module_init(veth_init); | |
1468 | module_exit(veth_exit); | |
1469 | ||
1470 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
1471 | MODULE_LICENSE("GPL v2"); | |
1472 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |