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Commit | Line | Data |
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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; |
65780c56 LB |
47 | }; |
48 | ||
4195e54a | 49 | struct veth_rq_stats { |
65780c56 | 50 | struct veth_stats vs; |
4195e54a TM |
51 | struct u64_stats_sync syncp; |
52 | }; | |
53 | ||
638264dc | 54 | struct veth_rq { |
948d4f21 TM |
55 | struct napi_struct xdp_napi; |
56 | struct net_device *dev; | |
57 | struct bpf_prog __rcu *xdp_prog; | |
d1396004 | 58 | struct xdp_mem_info xdp_mem; |
4195e54a | 59 | struct veth_rq_stats stats; |
948d4f21 TM |
60 | bool rx_notify_masked; |
61 | struct ptr_ring xdp_ring; | |
62 | struct xdp_rxq_info xdp_rxq; | |
e314dbdc PE |
63 | }; |
64 | ||
638264dc TM |
65 | struct veth_priv { |
66 | struct net_device __rcu *peer; | |
67 | atomic64_t dropped; | |
68 | struct bpf_prog *_xdp_prog; | |
69 | struct veth_rq *rq; | |
70 | unsigned int requested_headroom; | |
71 | }; | |
72 | ||
9cda7807 TM |
73 | struct veth_xdp_tx_bq { |
74 | struct xdp_frame *q[VETH_XDP_TX_BULK_SIZE]; | |
75 | unsigned int count; | |
76 | }; | |
77 | ||
e314dbdc PE |
78 | /* |
79 | * ethtool interface | |
80 | */ | |
81 | ||
d397b968 TM |
82 | struct veth_q_stat_desc { |
83 | char desc[ETH_GSTRING_LEN]; | |
84 | size_t offset; | |
85 | }; | |
86 | ||
65780c56 | 87 | #define VETH_RQ_STAT(m) offsetof(struct veth_stats, m) |
d397b968 TM |
88 | |
89 | static const struct veth_q_stat_desc veth_rq_stats_desc[] = { | |
90 | { "xdp_packets", VETH_RQ_STAT(xdp_packets) }, | |
91 | { "xdp_bytes", VETH_RQ_STAT(xdp_bytes) }, | |
92 | { "xdp_drops", VETH_RQ_STAT(xdp_drops) }, | |
93 | }; | |
94 | ||
95 | #define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc) | |
96 | ||
e314dbdc PE |
97 | static struct { |
98 | const char string[ETH_GSTRING_LEN]; | |
99 | } ethtool_stats_keys[] = { | |
100 | { "peer_ifindex" }, | |
101 | }; | |
102 | ||
56607b98 PR |
103 | static int veth_get_link_ksettings(struct net_device *dev, |
104 | struct ethtool_link_ksettings *cmd) | |
e314dbdc | 105 | { |
56607b98 PR |
106 | cmd->base.speed = SPEED_10000; |
107 | cmd->base.duplex = DUPLEX_FULL; | |
108 | cmd->base.port = PORT_TP; | |
109 | cmd->base.autoneg = AUTONEG_DISABLE; | |
e314dbdc PE |
110 | return 0; |
111 | } | |
112 | ||
113 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
114 | { | |
33a5ba14 RJ |
115 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
116 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
e314dbdc PE |
117 | } |
118 | ||
119 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
120 | { | |
d397b968 TM |
121 | char *p = (char *)buf; |
122 | int i, j; | |
123 | ||
e314dbdc PE |
124 | switch(stringset) { |
125 | case ETH_SS_STATS: | |
d397b968 TM |
126 | memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
127 | p += sizeof(ethtool_stats_keys); | |
128 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
129 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
abdf47aa FF |
130 | snprintf(p, ETH_GSTRING_LEN, |
131 | "rx_queue_%u_%.11s", | |
d397b968 TM |
132 | i, veth_rq_stats_desc[j].desc); |
133 | p += ETH_GSTRING_LEN; | |
134 | } | |
135 | } | |
e314dbdc PE |
136 | break; |
137 | } | |
138 | } | |
139 | ||
b9f2c044 | 140 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 141 | { |
b9f2c044 JG |
142 | switch (sset) { |
143 | case ETH_SS_STATS: | |
d397b968 TM |
144 | return ARRAY_SIZE(ethtool_stats_keys) + |
145 | VETH_RQ_STATS_LEN * dev->real_num_rx_queues; | |
b9f2c044 JG |
146 | default: |
147 | return -EOPNOTSUPP; | |
148 | } | |
e314dbdc PE |
149 | } |
150 | ||
151 | static void veth_get_ethtool_stats(struct net_device *dev, | |
152 | struct ethtool_stats *stats, u64 *data) | |
153 | { | |
d0e2c55e ED |
154 | struct veth_priv *priv = netdev_priv(dev); |
155 | struct net_device *peer = rtnl_dereference(priv->peer); | |
d397b968 | 156 | int i, j, idx; |
e314dbdc | 157 | |
d0e2c55e | 158 | data[0] = peer ? peer->ifindex : 0; |
d397b968 TM |
159 | idx = 1; |
160 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
161 | const struct veth_rq_stats *rq_stats = &priv->rq[i].stats; | |
65780c56 | 162 | const void *stats_base = (void *)&rq_stats->vs; |
d397b968 TM |
163 | unsigned int start; |
164 | size_t offset; | |
165 | ||
166 | do { | |
167 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
168 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
169 | offset = veth_rq_stats_desc[j].offset; | |
170 | data[idx + j] = *(u64 *)(stats_base + offset); | |
171 | } | |
172 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
173 | idx += VETH_RQ_STATS_LEN; | |
174 | } | |
e314dbdc PE |
175 | } |
176 | ||
0fc0b732 | 177 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
178 | .get_drvinfo = veth_get_drvinfo, |
179 | .get_link = ethtool_op_get_link, | |
e314dbdc | 180 | .get_strings = veth_get_strings, |
b9f2c044 | 181 | .get_sset_count = veth_get_sset_count, |
e314dbdc | 182 | .get_ethtool_stats = veth_get_ethtool_stats, |
56607b98 | 183 | .get_link_ksettings = veth_get_link_ksettings, |
056b21fb | 184 | .get_ts_info = ethtool_op_get_ts_info, |
e314dbdc PE |
185 | }; |
186 | ||
948d4f21 TM |
187 | /* general routines */ |
188 | ||
9fc8d518 TM |
189 | static bool veth_is_xdp_frame(void *ptr) |
190 | { | |
191 | return (unsigned long)ptr & VETH_XDP_FLAG; | |
192 | } | |
193 | ||
194 | static void *veth_ptr_to_xdp(void *ptr) | |
195 | { | |
196 | return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG); | |
197 | } | |
198 | ||
af87a3aa TM |
199 | static void *veth_xdp_to_ptr(void *ptr) |
200 | { | |
201 | return (void *)((unsigned long)ptr | VETH_XDP_FLAG); | |
202 | } | |
203 | ||
9fc8d518 TM |
204 | static void veth_ptr_free(void *ptr) |
205 | { | |
206 | if (veth_is_xdp_frame(ptr)) | |
207 | xdp_return_frame(veth_ptr_to_xdp(ptr)); | |
208 | else | |
209 | kfree_skb(ptr); | |
210 | } | |
211 | ||
638264dc | 212 | static void __veth_xdp_flush(struct veth_rq *rq) |
948d4f21 TM |
213 | { |
214 | /* Write ptr_ring before reading rx_notify_masked */ | |
215 | smp_mb(); | |
638264dc TM |
216 | if (!rq->rx_notify_masked) { |
217 | rq->rx_notify_masked = true; | |
218 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
219 | } |
220 | } | |
221 | ||
638264dc | 222 | static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb) |
948d4f21 | 223 | { |
638264dc | 224 | if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) { |
948d4f21 TM |
225 | dev_kfree_skb_any(skb); |
226 | return NET_RX_DROP; | |
227 | } | |
228 | ||
229 | return NET_RX_SUCCESS; | |
230 | } | |
231 | ||
638264dc TM |
232 | static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, |
233 | struct veth_rq *rq, bool xdp) | |
e314dbdc | 234 | { |
948d4f21 | 235 | return __dev_forward_skb(dev, skb) ?: xdp ? |
638264dc | 236 | veth_xdp_rx(rq, skb) : |
948d4f21 TM |
237 | netif_rx(skb); |
238 | } | |
239 | ||
240 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) | |
241 | { | |
242 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
638264dc | 243 | struct veth_rq *rq = NULL; |
d0e2c55e | 244 | struct net_device *rcv; |
2681128f | 245 | int length = skb->len; |
948d4f21 | 246 | bool rcv_xdp = false; |
638264dc | 247 | int rxq; |
e314dbdc | 248 | |
d0e2c55e ED |
249 | rcu_read_lock(); |
250 | rcv = rcu_dereference(priv->peer); | |
251 | if (unlikely(!rcv)) { | |
252 | kfree_skb(skb); | |
253 | goto drop; | |
254 | } | |
e314dbdc | 255 | |
948d4f21 | 256 | rcv_priv = netdev_priv(rcv); |
638264dc TM |
257 | rxq = skb_get_queue_mapping(skb); |
258 | if (rxq < rcv->real_num_rx_queues) { | |
259 | rq = &rcv_priv->rq[rxq]; | |
260 | rcv_xdp = rcu_access_pointer(rq->xdp_prog); | |
261 | if (rcv_xdp) | |
262 | skb_record_rx_queue(skb, rxq); | |
263 | } | |
948d4f21 | 264 | |
aa4e689e | 265 | skb_tx_timestamp(skb); |
638264dc | 266 | if (likely(veth_forward_skb(rcv, skb, rq, rcv_xdp) == NET_RX_SUCCESS)) { |
b4fba476 ED |
267 | if (!rcv_xdp) |
268 | dev_lstats_add(dev, length); | |
2681128f | 269 | } else { |
d0e2c55e | 270 | drop: |
2681128f ED |
271 | atomic64_inc(&priv->dropped); |
272 | } | |
948d4f21 TM |
273 | |
274 | if (rcv_xdp) | |
638264dc | 275 | __veth_xdp_flush(rq); |
948d4f21 | 276 | |
d0e2c55e | 277 | rcu_read_unlock(); |
948d4f21 | 278 | |
6ed10654 | 279 | return NETDEV_TX_OK; |
e314dbdc PE |
280 | } |
281 | ||
b4fba476 | 282 | static u64 veth_stats_tx(struct net_device *dev, u64 *packets, u64 *bytes) |
e314dbdc | 283 | { |
cf05c700 | 284 | struct veth_priv *priv = netdev_priv(dev); |
cf05c700 | 285 | |
b4fba476 | 286 | dev_lstats_read(dev, packets, bytes); |
2681128f ED |
287 | return atomic64_read(&priv->dropped); |
288 | } | |
289 | ||
65780c56 | 290 | static void veth_stats_rx(struct veth_stats *result, struct net_device *dev) |
4195e54a TM |
291 | { |
292 | struct veth_priv *priv = netdev_priv(dev); | |
293 | int i; | |
294 | ||
295 | result->xdp_packets = 0; | |
296 | result->xdp_bytes = 0; | |
297 | result->xdp_drops = 0; | |
298 | for (i = 0; i < dev->num_rx_queues; i++) { | |
299 | struct veth_rq_stats *stats = &priv->rq[i].stats; | |
300 | u64 packets, bytes, drops; | |
301 | unsigned int start; | |
302 | ||
303 | do { | |
304 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
65780c56 LB |
305 | packets = stats->vs.xdp_packets; |
306 | bytes = stats->vs.xdp_bytes; | |
307 | drops = stats->vs.xdp_drops; | |
4195e54a TM |
308 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
309 | result->xdp_packets += packets; | |
310 | result->xdp_bytes += bytes; | |
311 | result->xdp_drops += drops; | |
312 | } | |
313 | } | |
314 | ||
bc1f4470 | 315 | static void veth_get_stats64(struct net_device *dev, |
316 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
317 | { |
318 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 319 | struct net_device *peer; |
65780c56 | 320 | struct veth_stats rx; |
b4fba476 | 321 | u64 packets, bytes; |
4195e54a | 322 | |
b4fba476 ED |
323 | tot->tx_dropped = veth_stats_tx(dev, &packets, &bytes); |
324 | tot->tx_bytes = bytes; | |
325 | tot->tx_packets = packets; | |
2681128f | 326 | |
4195e54a TM |
327 | veth_stats_rx(&rx, dev); |
328 | tot->rx_dropped = rx.xdp_drops; | |
329 | tot->rx_bytes = rx.xdp_bytes; | |
330 | tot->rx_packets = rx.xdp_packets; | |
2681128f | 331 | |
d0e2c55e ED |
332 | rcu_read_lock(); |
333 | peer = rcu_dereference(priv->peer); | |
334 | if (peer) { | |
e25d5dbc | 335 | veth_stats_tx(peer, &packets, &bytes); |
b4fba476 ED |
336 | tot->rx_bytes += bytes; |
337 | tot->rx_packets += packets; | |
4195e54a TM |
338 | |
339 | veth_stats_rx(&rx, peer); | |
340 | tot->tx_bytes += rx.xdp_bytes; | |
341 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
342 | } |
343 | rcu_read_unlock(); | |
e314dbdc PE |
344 | } |
345 | ||
5c70ef85 G |
346 | /* fake multicast ability */ |
347 | static void veth_set_multicast_list(struct net_device *dev) | |
348 | { | |
349 | } | |
350 | ||
948d4f21 TM |
351 | static struct sk_buff *veth_build_skb(void *head, int headroom, int len, |
352 | int buflen) | |
353 | { | |
354 | struct sk_buff *skb; | |
355 | ||
356 | if (!buflen) { | |
357 | buflen = SKB_DATA_ALIGN(headroom + len) + | |
358 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
359 | } | |
360 | skb = build_skb(head, buflen); | |
361 | if (!skb) | |
362 | return NULL; | |
363 | ||
364 | skb_reserve(skb, headroom); | |
365 | skb_put(skb, len); | |
366 | ||
367 | return skb; | |
368 | } | |
369 | ||
638264dc TM |
370 | static int veth_select_rxq(struct net_device *dev) |
371 | { | |
372 | return smp_processor_id() % dev->real_num_rx_queues; | |
373 | } | |
374 | ||
af87a3aa TM |
375 | static int veth_xdp_xmit(struct net_device *dev, int n, |
376 | struct xdp_frame **frames, u32 flags) | |
377 | { | |
378 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
379 | struct net_device *rcv; | |
2131479d | 380 | int i, ret, drops = n; |
af87a3aa | 381 | unsigned int max_len; |
638264dc | 382 | struct veth_rq *rq; |
af87a3aa | 383 | |
b23bfa56 | 384 | rcu_read_lock(); |
2131479d TM |
385 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { |
386 | ret = -EINVAL; | |
387 | goto drop; | |
388 | } | |
af87a3aa TM |
389 | |
390 | rcv = rcu_dereference(priv->peer); | |
2131479d TM |
391 | if (unlikely(!rcv)) { |
392 | ret = -ENXIO; | |
393 | goto drop; | |
394 | } | |
af87a3aa TM |
395 | |
396 | rcv_priv = netdev_priv(rcv); | |
638264dc | 397 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
af87a3aa TM |
398 | /* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive |
399 | * side. This means an XDP program is loaded on the peer and the peer | |
400 | * device is up. | |
401 | */ | |
2131479d TM |
402 | if (!rcu_access_pointer(rq->xdp_prog)) { |
403 | ret = -ENXIO; | |
404 | goto drop; | |
405 | } | |
af87a3aa | 406 | |
2131479d | 407 | drops = 0; |
af87a3aa TM |
408 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; |
409 | ||
638264dc | 410 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
411 | for (i = 0; i < n; i++) { |
412 | struct xdp_frame *frame = frames[i]; | |
413 | void *ptr = veth_xdp_to_ptr(frame); | |
414 | ||
415 | if (unlikely(frame->len > max_len || | |
638264dc | 416 | __ptr_ring_produce(&rq->xdp_ring, ptr))) { |
af87a3aa TM |
417 | xdp_return_frame_rx_napi(frame); |
418 | drops++; | |
419 | } | |
420 | } | |
638264dc | 421 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
422 | |
423 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 424 | __veth_xdp_flush(rq); |
af87a3aa | 425 | |
b23bfa56 JF |
426 | if (likely(!drops)) { |
427 | rcu_read_unlock(); | |
2131479d | 428 | return n; |
b23bfa56 | 429 | } |
2131479d TM |
430 | |
431 | ret = n - drops; | |
432 | drop: | |
b23bfa56 | 433 | rcu_read_unlock(); |
2131479d TM |
434 | atomic64_add(drops, &priv->dropped); |
435 | ||
436 | return ret; | |
af87a3aa TM |
437 | } |
438 | ||
9cda7807 TM |
439 | static void veth_xdp_flush_bq(struct net_device *dev, struct veth_xdp_tx_bq *bq) |
440 | { | |
441 | int sent, i, err = 0; | |
442 | ||
443 | sent = veth_xdp_xmit(dev, bq->count, bq->q, 0); | |
444 | if (sent < 0) { | |
445 | err = sent; | |
446 | sent = 0; | |
447 | for (i = 0; i < bq->count; i++) | |
448 | xdp_return_frame(bq->q[i]); | |
449 | } | |
450 | trace_xdp_bulk_tx(dev, sent, bq->count - sent, err); | |
451 | ||
452 | bq->count = 0; | |
453 | } | |
454 | ||
455 | static void veth_xdp_flush(struct net_device *dev, struct veth_xdp_tx_bq *bq) | |
d1396004 TM |
456 | { |
457 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
458 | struct net_device *rcv; | |
638264dc | 459 | struct veth_rq *rq; |
d1396004 TM |
460 | |
461 | rcu_read_lock(); | |
9cda7807 | 462 | veth_xdp_flush_bq(dev, bq); |
d1396004 TM |
463 | rcv = rcu_dereference(priv->peer); |
464 | if (unlikely(!rcv)) | |
465 | goto out; | |
466 | ||
467 | rcv_priv = netdev_priv(rcv); | |
638264dc | 468 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 469 | /* xdp_ring is initialized on receive side? */ |
638264dc | 470 | if (unlikely(!rcu_access_pointer(rq->xdp_prog))) |
d1396004 TM |
471 | goto out; |
472 | ||
638264dc | 473 | __veth_xdp_flush(rq); |
d1396004 TM |
474 | out: |
475 | rcu_read_unlock(); | |
476 | } | |
477 | ||
9cda7807 TM |
478 | static int veth_xdp_tx(struct net_device *dev, struct xdp_buff *xdp, |
479 | struct veth_xdp_tx_bq *bq) | |
d1396004 TM |
480 | { |
481 | struct xdp_frame *frame = convert_to_xdp_frame(xdp); | |
482 | ||
483 | if (unlikely(!frame)) | |
484 | return -EOVERFLOW; | |
485 | ||
9cda7807 TM |
486 | if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE)) |
487 | veth_xdp_flush_bq(dev, bq); | |
488 | ||
489 | bq->q[bq->count++] = frame; | |
490 | ||
491 | return 0; | |
d1396004 TM |
492 | } |
493 | ||
638264dc | 494 | static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, |
d1396004 | 495 | struct xdp_frame *frame, |
1c5b82e5 LB |
496 | struct veth_xdp_tx_bq *bq, |
497 | struct veth_stats *stats) | |
9fc8d518 TM |
498 | { |
499 | void *hard_start = frame->data - frame->headroom; | |
500 | void *head = hard_start - sizeof(struct xdp_frame); | |
501 | int len = frame->len, delta = 0; | |
d1396004 | 502 | struct xdp_frame orig_frame; |
9fc8d518 TM |
503 | struct bpf_prog *xdp_prog; |
504 | unsigned int headroom; | |
505 | struct sk_buff *skb; | |
506 | ||
507 | rcu_read_lock(); | |
638264dc | 508 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 TM |
509 | if (likely(xdp_prog)) { |
510 | struct xdp_buff xdp; | |
511 | u32 act; | |
512 | ||
513 | xdp.data_hard_start = hard_start; | |
514 | xdp.data = frame->data; | |
515 | xdp.data_end = frame->data + frame->len; | |
516 | xdp.data_meta = frame->data - frame->metasize; | |
638264dc | 517 | xdp.rxq = &rq->xdp_rxq; |
9fc8d518 TM |
518 | |
519 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
520 | ||
521 | switch (act) { | |
522 | case XDP_PASS: | |
523 | delta = frame->data - xdp.data; | |
524 | len = xdp.data_end - xdp.data; | |
525 | break; | |
d1396004 TM |
526 | case XDP_TX: |
527 | orig_frame = *frame; | |
528 | xdp.data_hard_start = head; | |
529 | xdp.rxq->mem = frame->mem; | |
9cda7807 | 530 | if (unlikely(veth_xdp_tx(rq->dev, &xdp, bq) < 0)) { |
638264dc | 531 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 | 532 | frame = &orig_frame; |
1c5b82e5 | 533 | stats->rx_drops++; |
d1396004 TM |
534 | goto err_xdp; |
535 | } | |
1c5b82e5 | 536 | stats->xdp_tx++; |
d1396004 TM |
537 | rcu_read_unlock(); |
538 | goto xdp_xmit; | |
539 | case XDP_REDIRECT: | |
540 | orig_frame = *frame; | |
541 | xdp.data_hard_start = head; | |
542 | xdp.rxq->mem = frame->mem; | |
638264dc | 543 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
d1396004 | 544 | frame = &orig_frame; |
1c5b82e5 | 545 | stats->rx_drops++; |
d1396004 TM |
546 | goto err_xdp; |
547 | } | |
1c5b82e5 | 548 | stats->xdp_redirect++; |
d1396004 TM |
549 | rcu_read_unlock(); |
550 | goto xdp_xmit; | |
9fc8d518 TM |
551 | default: |
552 | bpf_warn_invalid_xdp_action(act); | |
a9b6d9ef | 553 | /* fall through */ |
9fc8d518 | 554 | case XDP_ABORTED: |
638264dc | 555 | trace_xdp_exception(rq->dev, xdp_prog, act); |
a9b6d9ef | 556 | /* fall through */ |
9fc8d518 | 557 | case XDP_DROP: |
1c5b82e5 | 558 | stats->xdp_drops++; |
9fc8d518 TM |
559 | goto err_xdp; |
560 | } | |
561 | } | |
562 | rcu_read_unlock(); | |
563 | ||
564 | headroom = sizeof(struct xdp_frame) + frame->headroom - delta; | |
565 | skb = veth_build_skb(head, headroom, len, 0); | |
566 | if (!skb) { | |
567 | xdp_return_frame(frame); | |
1c5b82e5 | 568 | stats->rx_drops++; |
9fc8d518 TM |
569 | goto err; |
570 | } | |
571 | ||
cbf33510 | 572 | xdp_release_frame(frame); |
9fc8d518 | 573 | xdp_scrub_frame(frame); |
638264dc | 574 | skb->protocol = eth_type_trans(skb, rq->dev); |
9fc8d518 TM |
575 | err: |
576 | return skb; | |
577 | err_xdp: | |
578 | rcu_read_unlock(); | |
579 | xdp_return_frame(frame); | |
d1396004 | 580 | xdp_xmit: |
9fc8d518 TM |
581 | return NULL; |
582 | } | |
583 | ||
1c5b82e5 LB |
584 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, |
585 | struct sk_buff *skb, | |
586 | struct veth_xdp_tx_bq *bq, | |
587 | struct veth_stats *stats) | |
948d4f21 TM |
588 | { |
589 | u32 pktlen, headroom, act, metalen; | |
590 | void *orig_data, *orig_data_end; | |
591 | struct bpf_prog *xdp_prog; | |
592 | int mac_len, delta, off; | |
593 | struct xdp_buff xdp; | |
594 | ||
4bf9ffa0 TM |
595 | skb_orphan(skb); |
596 | ||
948d4f21 | 597 | rcu_read_lock(); |
638264dc | 598 | xdp_prog = rcu_dereference(rq->xdp_prog); |
948d4f21 TM |
599 | if (unlikely(!xdp_prog)) { |
600 | rcu_read_unlock(); | |
601 | goto out; | |
602 | } | |
603 | ||
604 | mac_len = skb->data - skb_mac_header(skb); | |
605 | pktlen = skb->len + mac_len; | |
606 | headroom = skb_headroom(skb) - mac_len; | |
607 | ||
608 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
609 | skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) { | |
610 | struct sk_buff *nskb; | |
611 | int size, head_off; | |
612 | void *head, *start; | |
613 | struct page *page; | |
614 | ||
615 | size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) + | |
616 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
617 | if (size > PAGE_SIZE) | |
618 | goto drop; | |
619 | ||
620 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | |
621 | if (!page) | |
622 | goto drop; | |
623 | ||
624 | head = page_address(page); | |
625 | start = head + VETH_XDP_HEADROOM; | |
626 | if (skb_copy_bits(skb, -mac_len, start, pktlen)) { | |
627 | page_frag_free(head); | |
628 | goto drop; | |
629 | } | |
630 | ||
631 | nskb = veth_build_skb(head, | |
632 | VETH_XDP_HEADROOM + mac_len, skb->len, | |
633 | PAGE_SIZE); | |
634 | if (!nskb) { | |
635 | page_frag_free(head); | |
636 | goto drop; | |
637 | } | |
638 | ||
639 | skb_copy_header(nskb, skb); | |
640 | head_off = skb_headroom(nskb) - skb_headroom(skb); | |
641 | skb_headers_offset_update(nskb, head_off); | |
948d4f21 TM |
642 | consume_skb(skb); |
643 | skb = nskb; | |
644 | } | |
645 | ||
646 | xdp.data_hard_start = skb->head; | |
647 | xdp.data = skb_mac_header(skb); | |
648 | xdp.data_end = xdp.data + pktlen; | |
649 | xdp.data_meta = xdp.data; | |
638264dc | 650 | xdp.rxq = &rq->xdp_rxq; |
948d4f21 TM |
651 | orig_data = xdp.data; |
652 | orig_data_end = xdp.data_end; | |
653 | ||
654 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
655 | ||
656 | switch (act) { | |
657 | case XDP_PASS: | |
658 | break; | |
d1396004 TM |
659 | case XDP_TX: |
660 | get_page(virt_to_page(xdp.data)); | |
661 | consume_skb(skb); | |
638264dc | 662 | xdp.rxq->mem = rq->xdp_mem; |
9cda7807 | 663 | if (unlikely(veth_xdp_tx(rq->dev, &xdp, bq) < 0)) { |
638264dc | 664 | trace_xdp_exception(rq->dev, xdp_prog, act); |
1c5b82e5 | 665 | stats->rx_drops++; |
d1396004 TM |
666 | goto err_xdp; |
667 | } | |
1c5b82e5 | 668 | stats->xdp_tx++; |
d1396004 TM |
669 | rcu_read_unlock(); |
670 | goto xdp_xmit; | |
671 | case XDP_REDIRECT: | |
672 | get_page(virt_to_page(xdp.data)); | |
673 | consume_skb(skb); | |
638264dc | 674 | xdp.rxq->mem = rq->xdp_mem; |
1c5b82e5 LB |
675 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
676 | stats->rx_drops++; | |
d1396004 | 677 | goto err_xdp; |
1c5b82e5 LB |
678 | } |
679 | stats->xdp_redirect++; | |
d1396004 TM |
680 | rcu_read_unlock(); |
681 | goto xdp_xmit; | |
948d4f21 TM |
682 | default: |
683 | bpf_warn_invalid_xdp_action(act); | |
a9b6d9ef | 684 | /* fall through */ |
948d4f21 | 685 | case XDP_ABORTED: |
638264dc | 686 | trace_xdp_exception(rq->dev, xdp_prog, act); |
a9b6d9ef | 687 | /* fall through */ |
948d4f21 | 688 | case XDP_DROP: |
1c5b82e5 LB |
689 | stats->xdp_drops++; |
690 | goto xdp_drop; | |
948d4f21 TM |
691 | } |
692 | rcu_read_unlock(); | |
693 | ||
694 | delta = orig_data - xdp.data; | |
695 | off = mac_len + delta; | |
696 | if (off > 0) | |
697 | __skb_push(skb, off); | |
698 | else if (off < 0) | |
699 | __skb_pull(skb, -off); | |
700 | skb->mac_header -= delta; | |
701 | off = xdp.data_end - orig_data_end; | |
702 | if (off != 0) | |
703 | __skb_put(skb, off); | |
638264dc | 704 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 TM |
705 | |
706 | metalen = xdp.data - xdp.data_meta; | |
707 | if (metalen) | |
708 | skb_metadata_set(skb, metalen); | |
709 | out: | |
710 | return skb; | |
711 | drop: | |
1c5b82e5 LB |
712 | stats->rx_drops++; |
713 | xdp_drop: | |
948d4f21 TM |
714 | rcu_read_unlock(); |
715 | kfree_skb(skb); | |
716 | return NULL; | |
d1396004 TM |
717 | err_xdp: |
718 | rcu_read_unlock(); | |
719 | page_frag_free(xdp.data); | |
720 | xdp_xmit: | |
721 | return NULL; | |
948d4f21 TM |
722 | } |
723 | ||
1c5b82e5 LB |
724 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, |
725 | struct veth_xdp_tx_bq *bq, | |
726 | struct veth_stats *stats) | |
948d4f21 | 727 | { |
1c5b82e5 | 728 | int i, done = 0; |
948d4f21 TM |
729 | |
730 | for (i = 0; i < budget; i++) { | |
638264dc | 731 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
9fc8d518 | 732 | struct sk_buff *skb; |
948d4f21 | 733 | |
9fc8d518 | 734 | if (!ptr) |
948d4f21 TM |
735 | break; |
736 | ||
d1396004 | 737 | if (veth_is_xdp_frame(ptr)) { |
4195e54a TM |
738 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
739 | ||
1c5b82e5 LB |
740 | stats->xdp_bytes += frame->len; |
741 | skb = veth_xdp_rcv_one(rq, frame, bq, stats); | |
d1396004 | 742 | } else { |
4195e54a | 743 | skb = ptr; |
1c5b82e5 LB |
744 | stats->xdp_bytes += skb->len; |
745 | skb = veth_xdp_rcv_skb(rq, skb, bq, stats); | |
d1396004 | 746 | } |
948d4f21 TM |
747 | |
748 | if (skb) | |
638264dc | 749 | napi_gro_receive(&rq->xdp_napi, skb); |
948d4f21 TM |
750 | |
751 | done++; | |
752 | } | |
753 | ||
4195e54a | 754 | u64_stats_update_begin(&rq->stats.syncp); |
1c5b82e5 LB |
755 | rq->stats.vs.xdp_bytes += stats->xdp_bytes; |
756 | rq->stats.vs.xdp_drops += stats->xdp_drops + stats->rx_drops; | |
65780c56 | 757 | rq->stats.vs.xdp_packets += done; |
4195e54a TM |
758 | u64_stats_update_end(&rq->stats.syncp); |
759 | ||
948d4f21 TM |
760 | return done; |
761 | } | |
762 | ||
763 | static int veth_poll(struct napi_struct *napi, int budget) | |
764 | { | |
638264dc TM |
765 | struct veth_rq *rq = |
766 | container_of(napi, struct veth_rq, xdp_napi); | |
1c5b82e5 | 767 | struct veth_stats stats = {}; |
9cda7807 | 768 | struct veth_xdp_tx_bq bq; |
948d4f21 TM |
769 | int done; |
770 | ||
9cda7807 TM |
771 | bq.count = 0; |
772 | ||
d1396004 | 773 | xdp_set_return_frame_no_direct(); |
1c5b82e5 | 774 | done = veth_xdp_rcv(rq, budget, &bq, &stats); |
948d4f21 TM |
775 | |
776 | if (done < budget && napi_complete_done(napi, done)) { | |
777 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
778 | smp_store_mb(rq->rx_notify_masked, false); |
779 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
780 | rq->rx_notify_masked = true; | |
781 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
782 | } |
783 | } | |
784 | ||
1c5b82e5 | 785 | if (stats.xdp_tx > 0) |
9cda7807 | 786 | veth_xdp_flush(rq->dev, &bq); |
1c5b82e5 | 787 | if (stats.xdp_redirect > 0) |
1d233886 | 788 | xdp_do_flush(); |
d1396004 TM |
789 | xdp_clear_return_frame_no_direct(); |
790 | ||
948d4f21 TM |
791 | return done; |
792 | } | |
793 | ||
794 | static int veth_napi_add(struct net_device *dev) | |
795 | { | |
796 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 797 | int err, i; |
948d4f21 | 798 | |
638264dc TM |
799 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
800 | struct veth_rq *rq = &priv->rq[i]; | |
801 | ||
802 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
803 | if (err) | |
804 | goto err_xdp_ring; | |
805 | } | |
948d4f21 | 806 | |
638264dc TM |
807 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
808 | struct veth_rq *rq = &priv->rq[i]; | |
809 | ||
810 | netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT); | |
811 | napi_enable(&rq->xdp_napi); | |
812 | } | |
948d4f21 TM |
813 | |
814 | return 0; | |
638264dc TM |
815 | err_xdp_ring: |
816 | for (i--; i >= 0; i--) | |
817 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); | |
818 | ||
819 | return err; | |
948d4f21 TM |
820 | } |
821 | ||
822 | static void veth_napi_del(struct net_device *dev) | |
823 | { | |
824 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 825 | int i; |
948d4f21 | 826 | |
638264dc TM |
827 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
828 | struct veth_rq *rq = &priv->rq[i]; | |
829 | ||
830 | napi_disable(&rq->xdp_napi); | |
831 | napi_hash_del(&rq->xdp_napi); | |
832 | } | |
833 | synchronize_net(); | |
834 | ||
835 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
836 | struct veth_rq *rq = &priv->rq[i]; | |
837 | ||
838 | netif_napi_del(&rq->xdp_napi); | |
839 | rq->rx_notify_masked = false; | |
840 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
841 | } | |
948d4f21 TM |
842 | } |
843 | ||
844 | static int veth_enable_xdp(struct net_device *dev) | |
845 | { | |
846 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 847 | int err, i; |
948d4f21 | 848 | |
638264dc TM |
849 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { |
850 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
851 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 852 | |
638264dc TM |
853 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i); |
854 | if (err < 0) | |
855 | goto err_rxq_reg; | |
856 | ||
857 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
858 | MEM_TYPE_PAGE_SHARED, | |
859 | NULL); | |
860 | if (err < 0) | |
861 | goto err_reg_mem; | |
862 | ||
863 | /* Save original mem info as it can be overwritten */ | |
864 | rq->xdp_mem = rq->xdp_rxq.mem; | |
865 | } | |
948d4f21 TM |
866 | |
867 | err = veth_napi_add(dev); | |
868 | if (err) | |
638264dc | 869 | goto err_rxq_reg; |
948d4f21 TM |
870 | } |
871 | ||
638264dc TM |
872 | for (i = 0; i < dev->real_num_rx_queues; i++) |
873 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); | |
948d4f21 TM |
874 | |
875 | return 0; | |
638264dc TM |
876 | err_reg_mem: |
877 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
878 | err_rxq_reg: | |
879 | for (i--; i >= 0; i--) | |
880 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
948d4f21 TM |
881 | |
882 | return err; | |
883 | } | |
884 | ||
885 | static void veth_disable_xdp(struct net_device *dev) | |
886 | { | |
887 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 888 | int i; |
948d4f21 | 889 | |
638264dc TM |
890 | for (i = 0; i < dev->real_num_rx_queues; i++) |
891 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
948d4f21 | 892 | veth_napi_del(dev); |
638264dc TM |
893 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
894 | struct veth_rq *rq = &priv->rq[i]; | |
895 | ||
896 | rq->xdp_rxq.mem = rq->xdp_mem; | |
897 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
898 | } | |
948d4f21 TM |
899 | } |
900 | ||
e314dbdc PE |
901 | static int veth_open(struct net_device *dev) |
902 | { | |
d0e2c55e ED |
903 | struct veth_priv *priv = netdev_priv(dev); |
904 | struct net_device *peer = rtnl_dereference(priv->peer); | |
948d4f21 | 905 | int err; |
e314dbdc | 906 | |
d0e2c55e | 907 | if (!peer) |
e314dbdc PE |
908 | return -ENOTCONN; |
909 | ||
948d4f21 TM |
910 | if (priv->_xdp_prog) { |
911 | err = veth_enable_xdp(dev); | |
912 | if (err) | |
913 | return err; | |
914 | } | |
915 | ||
d0e2c55e | 916 | if (peer->flags & IFF_UP) { |
e314dbdc | 917 | netif_carrier_on(dev); |
d0e2c55e | 918 | netif_carrier_on(peer); |
e314dbdc | 919 | } |
948d4f21 | 920 | |
e314dbdc PE |
921 | return 0; |
922 | } | |
923 | ||
2cf48a10 EB |
924 | static int veth_close(struct net_device *dev) |
925 | { | |
926 | struct veth_priv *priv = netdev_priv(dev); | |
2efd32ee | 927 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
928 | |
929 | netif_carrier_off(dev); | |
2efd32ee ED |
930 | if (peer) |
931 | netif_carrier_off(peer); | |
2cf48a10 | 932 | |
948d4f21 TM |
933 | if (priv->_xdp_prog) |
934 | veth_disable_xdp(dev); | |
935 | ||
2cf48a10 EB |
936 | return 0; |
937 | } | |
938 | ||
91572088 | 939 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 940 | { |
91572088 | 941 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
942 | } |
943 | ||
7797b93b TM |
944 | static int veth_alloc_queues(struct net_device *dev) |
945 | { | |
946 | struct veth_priv *priv = netdev_priv(dev); | |
947 | int i; | |
948 | ||
949 | priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL); | |
950 | if (!priv->rq) | |
951 | return -ENOMEM; | |
952 | ||
4195e54a | 953 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 954 | priv->rq[i].dev = dev; |
4195e54a TM |
955 | u64_stats_init(&priv->rq[i].stats.syncp); |
956 | } | |
7797b93b TM |
957 | |
958 | return 0; | |
959 | } | |
960 | ||
961 | static void veth_free_queues(struct net_device *dev) | |
962 | { | |
963 | struct veth_priv *priv = netdev_priv(dev); | |
964 | ||
965 | kfree(priv->rq); | |
966 | } | |
967 | ||
e314dbdc PE |
968 | static int veth_dev_init(struct net_device *dev) |
969 | { | |
7797b93b TM |
970 | int err; |
971 | ||
14d73416 LR |
972 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
973 | if (!dev->lstats) | |
e314dbdc | 974 | return -ENOMEM; |
7797b93b TM |
975 | |
976 | err = veth_alloc_queues(dev); | |
977 | if (err) { | |
14d73416 | 978 | free_percpu(dev->lstats); |
7797b93b TM |
979 | return err; |
980 | } | |
981 | ||
e314dbdc PE |
982 | return 0; |
983 | } | |
984 | ||
11687a10 DM |
985 | static void veth_dev_free(struct net_device *dev) |
986 | { | |
7797b93b | 987 | veth_free_queues(dev); |
14d73416 | 988 | free_percpu(dev->lstats); |
11687a10 DM |
989 | } |
990 | ||
bb446c19 WC |
991 | #ifdef CONFIG_NET_POLL_CONTROLLER |
992 | static void veth_poll_controller(struct net_device *dev) | |
993 | { | |
994 | /* veth only receives frames when its peer sends one | |
948d4f21 | 995 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
996 | * never to have pending data when we poll for it so |
997 | * there is nothing to do here. | |
998 | * | |
999 | * We need this though so netpoll recognizes us as an interface that | |
1000 | * supports polling, which enables bridge devices in virt setups to | |
1001 | * still use netconsole | |
1002 | */ | |
1003 | } | |
1004 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
1005 | ||
a45253bf ND |
1006 | static int veth_get_iflink(const struct net_device *dev) |
1007 | { | |
1008 | struct veth_priv *priv = netdev_priv(dev); | |
1009 | struct net_device *peer; | |
1010 | int iflink; | |
1011 | ||
1012 | rcu_read_lock(); | |
1013 | peer = rcu_dereference(priv->peer); | |
1014 | iflink = peer ? peer->ifindex : 0; | |
1015 | rcu_read_unlock(); | |
1016 | ||
1017 | return iflink; | |
1018 | } | |
1019 | ||
dc224822 TM |
1020 | static netdev_features_t veth_fix_features(struct net_device *dev, |
1021 | netdev_features_t features) | |
1022 | { | |
1023 | struct veth_priv *priv = netdev_priv(dev); | |
1024 | struct net_device *peer; | |
1025 | ||
1026 | peer = rtnl_dereference(priv->peer); | |
1027 | if (peer) { | |
1028 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1029 | ||
1030 | if (peer_priv->_xdp_prog) | |
1031 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1032 | } | |
1033 | ||
1034 | return features; | |
1035 | } | |
1036 | ||
163e5292 PA |
1037 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1038 | { | |
1039 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1040 | struct net_device *peer; | |
1041 | ||
1042 | if (new_hr < 0) | |
1043 | new_hr = 0; | |
1044 | ||
1045 | rcu_read_lock(); | |
1046 | peer = rcu_dereference(priv->peer); | |
1047 | if (unlikely(!peer)) | |
1048 | goto out; | |
1049 | ||
1050 | peer_priv = netdev_priv(peer); | |
1051 | priv->requested_headroom = new_hr; | |
1052 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1053 | dev->needed_headroom = new_hr; | |
1054 | peer->needed_headroom = new_hr; | |
1055 | ||
1056 | out: | |
1057 | rcu_read_unlock(); | |
1058 | } | |
1059 | ||
948d4f21 TM |
1060 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1061 | struct netlink_ext_ack *extack) | |
1062 | { | |
1063 | struct veth_priv *priv = netdev_priv(dev); | |
1064 | struct bpf_prog *old_prog; | |
1065 | struct net_device *peer; | |
dc224822 | 1066 | unsigned int max_mtu; |
948d4f21 TM |
1067 | int err; |
1068 | ||
1069 | old_prog = priv->_xdp_prog; | |
1070 | priv->_xdp_prog = prog; | |
1071 | peer = rtnl_dereference(priv->peer); | |
1072 | ||
1073 | if (prog) { | |
1074 | if (!peer) { | |
1075 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1076 | err = -ENOTCONN; | |
1077 | goto err; | |
1078 | } | |
1079 | ||
dc224822 TM |
1080 | max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM - |
1081 | peer->hard_header_len - | |
1082 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1083 | if (peer->mtu > max_mtu) { | |
1084 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1085 | err = -ERANGE; | |
1086 | goto err; | |
1087 | } | |
1088 | ||
638264dc TM |
1089 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1090 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1091 | err = -ENOSPC; | |
1092 | goto err; | |
1093 | } | |
1094 | ||
948d4f21 TM |
1095 | if (dev->flags & IFF_UP) { |
1096 | err = veth_enable_xdp(dev); | |
1097 | if (err) { | |
1098 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1099 | goto err; | |
1100 | } | |
1101 | } | |
dc224822 TM |
1102 | |
1103 | if (!old_prog) { | |
1104 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1105 | peer->max_mtu = max_mtu; | |
1106 | } | |
948d4f21 TM |
1107 | } |
1108 | ||
1109 | if (old_prog) { | |
dc224822 TM |
1110 | if (!prog) { |
1111 | if (dev->flags & IFF_UP) | |
1112 | veth_disable_xdp(dev); | |
1113 | ||
1114 | if (peer) { | |
1115 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1116 | peer->max_mtu = ETH_MAX_MTU; | |
1117 | } | |
1118 | } | |
948d4f21 TM |
1119 | bpf_prog_put(old_prog); |
1120 | } | |
1121 | ||
dc224822 TM |
1122 | if ((!!old_prog ^ !!prog) && peer) |
1123 | netdev_update_features(peer); | |
1124 | ||
948d4f21 TM |
1125 | return 0; |
1126 | err: | |
1127 | priv->_xdp_prog = old_prog; | |
1128 | ||
1129 | return err; | |
1130 | } | |
1131 | ||
1132 | static u32 veth_xdp_query(struct net_device *dev) | |
1133 | { | |
1134 | struct veth_priv *priv = netdev_priv(dev); | |
1135 | const struct bpf_prog *xdp_prog; | |
1136 | ||
1137 | xdp_prog = priv->_xdp_prog; | |
1138 | if (xdp_prog) | |
1139 | return xdp_prog->aux->id; | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) | |
1145 | { | |
1146 | switch (xdp->command) { | |
1147 | case XDP_SETUP_PROG: | |
1148 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
1149 | case XDP_QUERY_PROG: | |
1150 | xdp->prog_id = veth_xdp_query(dev); | |
1151 | return 0; | |
1152 | default: | |
1153 | return -EINVAL; | |
1154 | } | |
1155 | } | |
1156 | ||
4456e7bd | 1157 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1158 | .ndo_init = veth_dev_init, |
1159 | .ndo_open = veth_open, | |
2cf48a10 | 1160 | .ndo_stop = veth_close, |
ee923623 | 1161 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1162 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1163 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1164 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1165 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1166 | .ndo_poll_controller = veth_poll_controller, | |
1167 | #endif | |
a45253bf | 1168 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1169 | .ndo_fix_features = veth_fix_features, |
1a04a821 | 1170 | .ndo_features_check = passthru_features_check, |
163e5292 | 1171 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1172 | .ndo_bpf = veth_xdp, |
af87a3aa | 1173 | .ndo_xdp_xmit = veth_xdp_xmit, |
4456e7bd SH |
1174 | }; |
1175 | ||
732912d7 | 1176 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1177 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1178 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1179 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1180 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1181 | |
e314dbdc PE |
1182 | static void veth_setup(struct net_device *dev) |
1183 | { | |
1184 | ether_setup(dev); | |
1185 | ||
550fd08c | 1186 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1187 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1188 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1189 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1190 | |
4456e7bd | 1191 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
1192 | dev->ethtool_ops = &veth_ethtool_ops; |
1193 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1194 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1195 | dev->vlan_features = dev->features & |
3f8c707b VY |
1196 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1197 | NETIF_F_HW_VLAN_STAG_TX | | |
1198 | NETIF_F_HW_VLAN_CTAG_RX | | |
1199 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1200 | dev->needs_free_netdev = true; |
1201 | dev->priv_destructor = veth_dev_free; | |
91572088 | 1202 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1203 | |
8093315a | 1204 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1205 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1206 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
e314dbdc PE |
1207 | } |
1208 | ||
1209 | /* | |
1210 | * netlink interface | |
1211 | */ | |
1212 | ||
a8b8a889 MS |
1213 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1214 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1215 | { |
1216 | if (tb[IFLA_ADDRESS]) { | |
1217 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1218 | return -EINVAL; | |
1219 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1220 | return -EADDRNOTAVAIL; | |
1221 | } | |
38d40815 EB |
1222 | if (tb[IFLA_MTU]) { |
1223 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1224 | return -EINVAL; | |
1225 | } | |
e314dbdc PE |
1226 | return 0; |
1227 | } | |
1228 | ||
1229 | static struct rtnl_link_ops veth_link_ops; | |
1230 | ||
81adee47 | 1231 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1232 | struct nlattr *tb[], struct nlattr *data[], |
1233 | struct netlink_ext_ack *extack) | |
e314dbdc | 1234 | { |
7797b93b | 1235 | int err; |
e314dbdc PE |
1236 | struct net_device *peer; |
1237 | struct veth_priv *priv; | |
1238 | char ifname[IFNAMSIZ]; | |
1239 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1240 | unsigned char name_assign_type; |
3729d502 | 1241 | struct ifinfomsg *ifmp; |
81adee47 | 1242 | struct net *net; |
e314dbdc PE |
1243 | |
1244 | /* | |
1245 | * create and register peer first | |
e314dbdc | 1246 | */ |
e314dbdc PE |
1247 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1248 | struct nlattr *nla_peer; | |
1249 | ||
1250 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1251 | ifmp = nla_data(nla_peer); |
f7b12606 JP |
1252 | err = rtnl_nla_parse_ifla(peer_tb, |
1253 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
fceb6435 JB |
1254 | nla_len(nla_peer) - sizeof(struct ifinfomsg), |
1255 | NULL); | |
e314dbdc PE |
1256 | if (err < 0) |
1257 | return err; | |
1258 | ||
a8b8a889 | 1259 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1260 | if (err < 0) |
1261 | return err; | |
1262 | ||
1263 | tbp = peer_tb; | |
3729d502 PM |
1264 | } else { |
1265 | ifmp = NULL; | |
e314dbdc | 1266 | tbp = tb; |
3729d502 | 1267 | } |
e314dbdc | 1268 | |
191cdb38 | 1269 | if (ifmp && tbp[IFLA_IFNAME]) { |
e314dbdc | 1270 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1271 | name_assign_type = NET_NAME_USER; |
1272 | } else { | |
e314dbdc | 1273 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1274 | name_assign_type = NET_NAME_ENUM; |
1275 | } | |
e314dbdc | 1276 | |
81adee47 EB |
1277 | net = rtnl_link_get_net(src_net, tbp); |
1278 | if (IS_ERR(net)) | |
1279 | return PTR_ERR(net); | |
1280 | ||
5517750f | 1281 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1282 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1283 | if (IS_ERR(peer)) { |
1284 | put_net(net); | |
e314dbdc | 1285 | return PTR_ERR(peer); |
81adee47 | 1286 | } |
e314dbdc | 1287 | |
191cdb38 | 1288 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1289 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1290 | |
1291 | if (ifmp && (dev->ifindex != 0)) | |
1292 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1293 | |
72d24955 SH |
1294 | peer->gso_max_size = dev->gso_max_size; |
1295 | peer->gso_max_segs = dev->gso_max_segs; | |
1296 | ||
e314dbdc | 1297 | err = register_netdevice(peer); |
81adee47 EB |
1298 | put_net(net); |
1299 | net = NULL; | |
e314dbdc PE |
1300 | if (err < 0) |
1301 | goto err_register_peer; | |
1302 | ||
1303 | netif_carrier_off(peer); | |
1304 | ||
3729d502 PM |
1305 | err = rtnl_configure_link(peer, ifmp); |
1306 | if (err < 0) | |
1307 | goto err_configure_peer; | |
1308 | ||
e314dbdc PE |
1309 | /* |
1310 | * register dev last | |
1311 | * | |
1312 | * note, that since we've registered new device the dev's name | |
1313 | * should be re-allocated | |
1314 | */ | |
1315 | ||
1316 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1317 | eth_hw_addr_random(dev); |
e314dbdc | 1318 | |
6c8c4446 JP |
1319 | if (tb[IFLA_IFNAME]) |
1320 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
1321 | else | |
1322 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1323 | ||
e314dbdc PE |
1324 | err = register_netdevice(dev); |
1325 | if (err < 0) | |
1326 | goto err_register_dev; | |
1327 | ||
1328 | netif_carrier_off(dev); | |
1329 | ||
1330 | /* | |
1331 | * tie the deviced together | |
1332 | */ | |
1333 | ||
1334 | priv = netdev_priv(dev); | |
d0e2c55e | 1335 | rcu_assign_pointer(priv->peer, peer); |
e314dbdc PE |
1336 | |
1337 | priv = netdev_priv(peer); | |
d0e2c55e | 1338 | rcu_assign_pointer(priv->peer, dev); |
948d4f21 | 1339 | |
e314dbdc PE |
1340 | return 0; |
1341 | ||
1342 | err_register_dev: | |
1343 | /* nothing to do */ | |
3729d502 | 1344 | err_configure_peer: |
e314dbdc PE |
1345 | unregister_netdevice(peer); |
1346 | return err; | |
1347 | ||
1348 | err_register_peer: | |
1349 | free_netdev(peer); | |
1350 | return err; | |
1351 | } | |
1352 | ||
23289a37 | 1353 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1354 | { |
1355 | struct veth_priv *priv; | |
1356 | struct net_device *peer; | |
1357 | ||
1358 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1359 | peer = rtnl_dereference(priv->peer); |
1360 | ||
1361 | /* Note : dellink() is called from default_device_exit_batch(), | |
1362 | * before a rcu_synchronize() point. The devices are guaranteed | |
1363 | * not being freed before one RCU grace period. | |
1364 | */ | |
1365 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1366 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1367 | |
1368 | if (peer) { | |
1369 | priv = netdev_priv(peer); | |
1370 | RCU_INIT_POINTER(priv->peer, NULL); | |
1371 | unregister_netdevice_queue(peer, head); | |
1372 | } | |
e314dbdc PE |
1373 | } |
1374 | ||
23711438 TG |
1375 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
1376 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
1377 | }; | |
e314dbdc | 1378 | |
e5f4e7b9 ND |
1379 | static struct net *veth_get_link_net(const struct net_device *dev) |
1380 | { | |
1381 | struct veth_priv *priv = netdev_priv(dev); | |
1382 | struct net_device *peer = rtnl_dereference(priv->peer); | |
1383 | ||
1384 | return peer ? dev_net(peer) : dev_net(dev); | |
1385 | } | |
1386 | ||
e314dbdc PE |
1387 | static struct rtnl_link_ops veth_link_ops = { |
1388 | .kind = DRV_NAME, | |
1389 | .priv_size = sizeof(struct veth_priv), | |
1390 | .setup = veth_setup, | |
1391 | .validate = veth_validate, | |
1392 | .newlink = veth_newlink, | |
1393 | .dellink = veth_dellink, | |
1394 | .policy = veth_policy, | |
1395 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 1396 | .get_link_net = veth_get_link_net, |
e314dbdc PE |
1397 | }; |
1398 | ||
1399 | /* | |
1400 | * init/fini | |
1401 | */ | |
1402 | ||
1403 | static __init int veth_init(void) | |
1404 | { | |
1405 | return rtnl_link_register(&veth_link_ops); | |
1406 | } | |
1407 | ||
1408 | static __exit void veth_exit(void) | |
1409 | { | |
68365458 | 1410 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
1411 | } |
1412 | ||
1413 | module_init(veth_init); | |
1414 | module_exit(veth_exit); | |
1415 | ||
1416 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
1417 | MODULE_LICENSE("GPL v2"); | |
1418 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |