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Commit | Line | Data |
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e314dbdc PE |
1 | /* |
2 | * drivers/net/veth.c | |
3 | * | |
4 | * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc | |
5 | * | |
6 | * Author: Pavel Emelianov <xemul@openvz.org> | |
7 | * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> | |
8 | * | |
9 | */ | |
10 | ||
e314dbdc | 11 | #include <linux/netdevice.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
e314dbdc PE |
13 | #include <linux/ethtool.h> |
14 | #include <linux/etherdevice.h> | |
cf05c700 | 15 | #include <linux/u64_stats_sync.h> |
e314dbdc | 16 | |
f7b12606 | 17 | #include <net/rtnetlink.h> |
e314dbdc PE |
18 | #include <net/dst.h> |
19 | #include <net/xfrm.h> | |
af87a3aa | 20 | #include <net/xdp.h> |
ecef969e | 21 | #include <linux/veth.h> |
9d9779e7 | 22 | #include <linux/module.h> |
948d4f21 TM |
23 | #include <linux/bpf.h> |
24 | #include <linux/filter.h> | |
25 | #include <linux/ptr_ring.h> | |
948d4f21 | 26 | #include <linux/bpf_trace.h> |
aa4e689e | 27 | #include <linux/net_tstamp.h> |
e314dbdc PE |
28 | |
29 | #define DRV_NAME "veth" | |
30 | #define DRV_VERSION "1.0" | |
31 | ||
9fc8d518 | 32 | #define VETH_XDP_FLAG BIT(0) |
948d4f21 TM |
33 | #define VETH_RING_SIZE 256 |
34 | #define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN) | |
35 | ||
d1396004 TM |
36 | /* Separating two types of XDP xmit */ |
37 | #define VETH_XDP_TX BIT(0) | |
38 | #define VETH_XDP_REDIR BIT(1) | |
39 | ||
4195e54a TM |
40 | struct veth_rq_stats { |
41 | u64 xdp_packets; | |
42 | u64 xdp_bytes; | |
43 | u64 xdp_drops; | |
44 | struct u64_stats_sync syncp; | |
45 | }; | |
46 | ||
638264dc | 47 | struct veth_rq { |
948d4f21 TM |
48 | struct napi_struct xdp_napi; |
49 | struct net_device *dev; | |
50 | struct bpf_prog __rcu *xdp_prog; | |
d1396004 | 51 | struct xdp_mem_info xdp_mem; |
4195e54a | 52 | struct veth_rq_stats stats; |
948d4f21 TM |
53 | bool rx_notify_masked; |
54 | struct ptr_ring xdp_ring; | |
55 | struct xdp_rxq_info xdp_rxq; | |
e314dbdc PE |
56 | }; |
57 | ||
638264dc TM |
58 | struct veth_priv { |
59 | struct net_device __rcu *peer; | |
60 | atomic64_t dropped; | |
61 | struct bpf_prog *_xdp_prog; | |
62 | struct veth_rq *rq; | |
63 | unsigned int requested_headroom; | |
64 | }; | |
65 | ||
e314dbdc PE |
66 | /* |
67 | * ethtool interface | |
68 | */ | |
69 | ||
d397b968 TM |
70 | struct veth_q_stat_desc { |
71 | char desc[ETH_GSTRING_LEN]; | |
72 | size_t offset; | |
73 | }; | |
74 | ||
75 | #define VETH_RQ_STAT(m) offsetof(struct veth_rq_stats, m) | |
76 | ||
77 | static const struct veth_q_stat_desc veth_rq_stats_desc[] = { | |
78 | { "xdp_packets", VETH_RQ_STAT(xdp_packets) }, | |
79 | { "xdp_bytes", VETH_RQ_STAT(xdp_bytes) }, | |
80 | { "xdp_drops", VETH_RQ_STAT(xdp_drops) }, | |
81 | }; | |
82 | ||
83 | #define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc) | |
84 | ||
e314dbdc PE |
85 | static struct { |
86 | const char string[ETH_GSTRING_LEN]; | |
87 | } ethtool_stats_keys[] = { | |
88 | { "peer_ifindex" }, | |
89 | }; | |
90 | ||
56607b98 PR |
91 | static int veth_get_link_ksettings(struct net_device *dev, |
92 | struct ethtool_link_ksettings *cmd) | |
e314dbdc | 93 | { |
56607b98 PR |
94 | cmd->base.speed = SPEED_10000; |
95 | cmd->base.duplex = DUPLEX_FULL; | |
96 | cmd->base.port = PORT_TP; | |
97 | cmd->base.autoneg = AUTONEG_DISABLE; | |
e314dbdc PE |
98 | return 0; |
99 | } | |
100 | ||
101 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
102 | { | |
33a5ba14 RJ |
103 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
104 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
e314dbdc PE |
105 | } |
106 | ||
107 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
108 | { | |
d397b968 TM |
109 | char *p = (char *)buf; |
110 | int i, j; | |
111 | ||
e314dbdc PE |
112 | switch(stringset) { |
113 | case ETH_SS_STATS: | |
d397b968 TM |
114 | memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
115 | p += sizeof(ethtool_stats_keys); | |
116 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
117 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
118 | snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", | |
119 | i, veth_rq_stats_desc[j].desc); | |
120 | p += ETH_GSTRING_LEN; | |
121 | } | |
122 | } | |
e314dbdc PE |
123 | break; |
124 | } | |
125 | } | |
126 | ||
b9f2c044 | 127 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 128 | { |
b9f2c044 JG |
129 | switch (sset) { |
130 | case ETH_SS_STATS: | |
d397b968 TM |
131 | return ARRAY_SIZE(ethtool_stats_keys) + |
132 | VETH_RQ_STATS_LEN * dev->real_num_rx_queues; | |
b9f2c044 JG |
133 | default: |
134 | return -EOPNOTSUPP; | |
135 | } | |
e314dbdc PE |
136 | } |
137 | ||
138 | static void veth_get_ethtool_stats(struct net_device *dev, | |
139 | struct ethtool_stats *stats, u64 *data) | |
140 | { | |
d0e2c55e ED |
141 | struct veth_priv *priv = netdev_priv(dev); |
142 | struct net_device *peer = rtnl_dereference(priv->peer); | |
d397b968 | 143 | int i, j, idx; |
e314dbdc | 144 | |
d0e2c55e | 145 | data[0] = peer ? peer->ifindex : 0; |
d397b968 TM |
146 | idx = 1; |
147 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
148 | const struct veth_rq_stats *rq_stats = &priv->rq[i].stats; | |
149 | const void *stats_base = (void *)rq_stats; | |
150 | unsigned int start; | |
151 | size_t offset; | |
152 | ||
153 | do { | |
154 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
155 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
156 | offset = veth_rq_stats_desc[j].offset; | |
157 | data[idx + j] = *(u64 *)(stats_base + offset); | |
158 | } | |
159 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
160 | idx += VETH_RQ_STATS_LEN; | |
161 | } | |
e314dbdc PE |
162 | } |
163 | ||
aa4e689e MW |
164 | static int veth_get_ts_info(struct net_device *dev, |
165 | struct ethtool_ts_info *info) | |
166 | { | |
167 | info->so_timestamping = | |
168 | SOF_TIMESTAMPING_TX_SOFTWARE | | |
169 | SOF_TIMESTAMPING_RX_SOFTWARE | | |
170 | SOF_TIMESTAMPING_SOFTWARE; | |
171 | info->phc_index = -1; | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
0fc0b732 | 176 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
177 | .get_drvinfo = veth_get_drvinfo, |
178 | .get_link = ethtool_op_get_link, | |
e314dbdc | 179 | .get_strings = veth_get_strings, |
b9f2c044 | 180 | .get_sset_count = veth_get_sset_count, |
e314dbdc | 181 | .get_ethtool_stats = veth_get_ethtool_stats, |
56607b98 | 182 | .get_link_ksettings = veth_get_link_ksettings, |
aa4e689e | 183 | .get_ts_info = veth_get_ts_info, |
e314dbdc PE |
184 | }; |
185 | ||
948d4f21 TM |
186 | /* general routines */ |
187 | ||
9fc8d518 TM |
188 | static bool veth_is_xdp_frame(void *ptr) |
189 | { | |
190 | return (unsigned long)ptr & VETH_XDP_FLAG; | |
191 | } | |
192 | ||
193 | static void *veth_ptr_to_xdp(void *ptr) | |
194 | { | |
195 | return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG); | |
196 | } | |
197 | ||
af87a3aa TM |
198 | static void *veth_xdp_to_ptr(void *ptr) |
199 | { | |
200 | return (void *)((unsigned long)ptr | VETH_XDP_FLAG); | |
201 | } | |
202 | ||
9fc8d518 TM |
203 | static void veth_ptr_free(void *ptr) |
204 | { | |
205 | if (veth_is_xdp_frame(ptr)) | |
206 | xdp_return_frame(veth_ptr_to_xdp(ptr)); | |
207 | else | |
208 | kfree_skb(ptr); | |
209 | } | |
210 | ||
638264dc | 211 | static void __veth_xdp_flush(struct veth_rq *rq) |
948d4f21 TM |
212 | { |
213 | /* Write ptr_ring before reading rx_notify_masked */ | |
214 | smp_mb(); | |
638264dc TM |
215 | if (!rq->rx_notify_masked) { |
216 | rq->rx_notify_masked = true; | |
217 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
218 | } |
219 | } | |
220 | ||
638264dc | 221 | static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb) |
948d4f21 | 222 | { |
638264dc | 223 | if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) { |
948d4f21 TM |
224 | dev_kfree_skb_any(skb); |
225 | return NET_RX_DROP; | |
226 | } | |
227 | ||
228 | return NET_RX_SUCCESS; | |
229 | } | |
230 | ||
638264dc TM |
231 | static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, |
232 | struct veth_rq *rq, bool xdp) | |
e314dbdc | 233 | { |
948d4f21 | 234 | return __dev_forward_skb(dev, skb) ?: xdp ? |
638264dc | 235 | veth_xdp_rx(rq, skb) : |
948d4f21 TM |
236 | netif_rx(skb); |
237 | } | |
238 | ||
239 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) | |
240 | { | |
241 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
638264dc | 242 | struct veth_rq *rq = NULL; |
d0e2c55e | 243 | struct net_device *rcv; |
2681128f | 244 | int length = skb->len; |
948d4f21 | 245 | bool rcv_xdp = false; |
638264dc | 246 | int rxq; |
e314dbdc | 247 | |
d0e2c55e ED |
248 | rcu_read_lock(); |
249 | rcv = rcu_dereference(priv->peer); | |
250 | if (unlikely(!rcv)) { | |
251 | kfree_skb(skb); | |
252 | goto drop; | |
253 | } | |
e314dbdc | 254 | |
948d4f21 | 255 | rcv_priv = netdev_priv(rcv); |
638264dc TM |
256 | rxq = skb_get_queue_mapping(skb); |
257 | if (rxq < rcv->real_num_rx_queues) { | |
258 | rq = &rcv_priv->rq[rxq]; | |
259 | rcv_xdp = rcu_access_pointer(rq->xdp_prog); | |
260 | if (rcv_xdp) | |
261 | skb_record_rx_queue(skb, rxq); | |
262 | } | |
948d4f21 | 263 | |
aa4e689e | 264 | skb_tx_timestamp(skb); |
638264dc | 265 | if (likely(veth_forward_skb(rcv, skb, rq, rcv_xdp) == NET_RX_SUCCESS)) { |
4195e54a TM |
266 | if (!rcv_xdp) { |
267 | struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats); | |
e314dbdc | 268 | |
4195e54a TM |
269 | u64_stats_update_begin(&stats->syncp); |
270 | stats->bytes += length; | |
271 | stats->packets++; | |
272 | u64_stats_update_end(&stats->syncp); | |
273 | } | |
2681128f | 274 | } else { |
d0e2c55e | 275 | drop: |
2681128f ED |
276 | atomic64_inc(&priv->dropped); |
277 | } | |
948d4f21 TM |
278 | |
279 | if (rcv_xdp) | |
638264dc | 280 | __veth_xdp_flush(rq); |
948d4f21 | 281 | |
d0e2c55e | 282 | rcu_read_unlock(); |
948d4f21 | 283 | |
6ed10654 | 284 | return NETDEV_TX_OK; |
e314dbdc PE |
285 | } |
286 | ||
4195e54a | 287 | static u64 veth_stats_tx(struct pcpu_lstats *result, struct net_device *dev) |
e314dbdc | 288 | { |
cf05c700 | 289 | struct veth_priv *priv = netdev_priv(dev); |
11687a10 | 290 | int cpu; |
e314dbdc | 291 | |
2681128f ED |
292 | result->packets = 0; |
293 | result->bytes = 0; | |
2b1c8b0f | 294 | for_each_possible_cpu(cpu) { |
14d73416 | 295 | struct pcpu_lstats *stats = per_cpu_ptr(dev->lstats, cpu); |
2681128f | 296 | u64 packets, bytes; |
cf05c700 ED |
297 | unsigned int start; |
298 | ||
299 | do { | |
57a7744e | 300 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
2681128f ED |
301 | packets = stats->packets; |
302 | bytes = stats->bytes; | |
57a7744e | 303 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
2681128f ED |
304 | result->packets += packets; |
305 | result->bytes += bytes; | |
11687a10 | 306 | } |
2681128f ED |
307 | return atomic64_read(&priv->dropped); |
308 | } | |
309 | ||
4195e54a TM |
310 | static void veth_stats_rx(struct veth_rq_stats *result, struct net_device *dev) |
311 | { | |
312 | struct veth_priv *priv = netdev_priv(dev); | |
313 | int i; | |
314 | ||
315 | result->xdp_packets = 0; | |
316 | result->xdp_bytes = 0; | |
317 | result->xdp_drops = 0; | |
318 | for (i = 0; i < dev->num_rx_queues; i++) { | |
319 | struct veth_rq_stats *stats = &priv->rq[i].stats; | |
320 | u64 packets, bytes, drops; | |
321 | unsigned int start; | |
322 | ||
323 | do { | |
324 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
325 | packets = stats->xdp_packets; | |
326 | bytes = stats->xdp_bytes; | |
327 | drops = stats->xdp_drops; | |
328 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); | |
329 | result->xdp_packets += packets; | |
330 | result->xdp_bytes += bytes; | |
331 | result->xdp_drops += drops; | |
332 | } | |
333 | } | |
334 | ||
bc1f4470 | 335 | static void veth_get_stats64(struct net_device *dev, |
336 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
337 | { |
338 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 339 | struct net_device *peer; |
4195e54a TM |
340 | struct veth_rq_stats rx; |
341 | struct pcpu_lstats tx; | |
342 | ||
343 | tot->tx_dropped = veth_stats_tx(&tx, dev); | |
344 | tot->tx_bytes = tx.bytes; | |
345 | tot->tx_packets = tx.packets; | |
2681128f | 346 | |
4195e54a TM |
347 | veth_stats_rx(&rx, dev); |
348 | tot->rx_dropped = rx.xdp_drops; | |
349 | tot->rx_bytes = rx.xdp_bytes; | |
350 | tot->rx_packets = rx.xdp_packets; | |
2681128f | 351 | |
d0e2c55e ED |
352 | rcu_read_lock(); |
353 | peer = rcu_dereference(priv->peer); | |
354 | if (peer) { | |
4195e54a TM |
355 | tot->rx_dropped += veth_stats_tx(&tx, peer); |
356 | tot->rx_bytes += tx.bytes; | |
357 | tot->rx_packets += tx.packets; | |
358 | ||
359 | veth_stats_rx(&rx, peer); | |
360 | tot->tx_bytes += rx.xdp_bytes; | |
361 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
362 | } |
363 | rcu_read_unlock(); | |
e314dbdc PE |
364 | } |
365 | ||
5c70ef85 G |
366 | /* fake multicast ability */ |
367 | static void veth_set_multicast_list(struct net_device *dev) | |
368 | { | |
369 | } | |
370 | ||
948d4f21 TM |
371 | static struct sk_buff *veth_build_skb(void *head, int headroom, int len, |
372 | int buflen) | |
373 | { | |
374 | struct sk_buff *skb; | |
375 | ||
376 | if (!buflen) { | |
377 | buflen = SKB_DATA_ALIGN(headroom + len) + | |
378 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
379 | } | |
380 | skb = build_skb(head, buflen); | |
381 | if (!skb) | |
382 | return NULL; | |
383 | ||
384 | skb_reserve(skb, headroom); | |
385 | skb_put(skb, len); | |
386 | ||
387 | return skb; | |
388 | } | |
389 | ||
638264dc TM |
390 | static int veth_select_rxq(struct net_device *dev) |
391 | { | |
392 | return smp_processor_id() % dev->real_num_rx_queues; | |
393 | } | |
394 | ||
af87a3aa TM |
395 | static int veth_xdp_xmit(struct net_device *dev, int n, |
396 | struct xdp_frame **frames, u32 flags) | |
397 | { | |
398 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
399 | struct net_device *rcv; | |
2131479d | 400 | int i, ret, drops = n; |
af87a3aa | 401 | unsigned int max_len; |
638264dc | 402 | struct veth_rq *rq; |
af87a3aa | 403 | |
2131479d TM |
404 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { |
405 | ret = -EINVAL; | |
406 | goto drop; | |
407 | } | |
af87a3aa TM |
408 | |
409 | rcv = rcu_dereference(priv->peer); | |
2131479d TM |
410 | if (unlikely(!rcv)) { |
411 | ret = -ENXIO; | |
412 | goto drop; | |
413 | } | |
af87a3aa TM |
414 | |
415 | rcv_priv = netdev_priv(rcv); | |
638264dc | 416 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
af87a3aa TM |
417 | /* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive |
418 | * side. This means an XDP program is loaded on the peer and the peer | |
419 | * device is up. | |
420 | */ | |
2131479d TM |
421 | if (!rcu_access_pointer(rq->xdp_prog)) { |
422 | ret = -ENXIO; | |
423 | goto drop; | |
424 | } | |
af87a3aa | 425 | |
2131479d | 426 | drops = 0; |
af87a3aa TM |
427 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; |
428 | ||
638264dc | 429 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
430 | for (i = 0; i < n; i++) { |
431 | struct xdp_frame *frame = frames[i]; | |
432 | void *ptr = veth_xdp_to_ptr(frame); | |
433 | ||
434 | if (unlikely(frame->len > max_len || | |
638264dc | 435 | __ptr_ring_produce(&rq->xdp_ring, ptr))) { |
af87a3aa TM |
436 | xdp_return_frame_rx_napi(frame); |
437 | drops++; | |
438 | } | |
439 | } | |
638264dc | 440 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
441 | |
442 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 443 | __veth_xdp_flush(rq); |
af87a3aa | 444 | |
2131479d TM |
445 | if (likely(!drops)) |
446 | return n; | |
447 | ||
448 | ret = n - drops; | |
449 | drop: | |
450 | atomic64_add(drops, &priv->dropped); | |
451 | ||
452 | return ret; | |
af87a3aa TM |
453 | } |
454 | ||
d1396004 TM |
455 | static void veth_xdp_flush(struct net_device *dev) |
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(); | |
462 | rcv = rcu_dereference(priv->peer); | |
463 | if (unlikely(!rcv)) | |
464 | goto out; | |
465 | ||
466 | rcv_priv = netdev_priv(rcv); | |
638264dc | 467 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 468 | /* xdp_ring is initialized on receive side? */ |
638264dc | 469 | if (unlikely(!rcu_access_pointer(rq->xdp_prog))) |
d1396004 TM |
470 | goto out; |
471 | ||
638264dc | 472 | __veth_xdp_flush(rq); |
d1396004 TM |
473 | out: |
474 | rcu_read_unlock(); | |
475 | } | |
476 | ||
477 | static int veth_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) | |
478 | { | |
479 | struct xdp_frame *frame = convert_to_xdp_frame(xdp); | |
480 | ||
481 | if (unlikely(!frame)) | |
482 | return -EOVERFLOW; | |
483 | ||
484 | return veth_xdp_xmit(dev, 1, &frame, 0); | |
485 | } | |
486 | ||
638264dc | 487 | static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, |
d1396004 TM |
488 | struct xdp_frame *frame, |
489 | unsigned int *xdp_xmit) | |
9fc8d518 TM |
490 | { |
491 | void *hard_start = frame->data - frame->headroom; | |
492 | void *head = hard_start - sizeof(struct xdp_frame); | |
493 | int len = frame->len, delta = 0; | |
d1396004 | 494 | struct xdp_frame orig_frame; |
9fc8d518 TM |
495 | struct bpf_prog *xdp_prog; |
496 | unsigned int headroom; | |
497 | struct sk_buff *skb; | |
498 | ||
499 | rcu_read_lock(); | |
638264dc | 500 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 TM |
501 | if (likely(xdp_prog)) { |
502 | struct xdp_buff xdp; | |
503 | u32 act; | |
504 | ||
505 | xdp.data_hard_start = hard_start; | |
506 | xdp.data = frame->data; | |
507 | xdp.data_end = frame->data + frame->len; | |
508 | xdp.data_meta = frame->data - frame->metasize; | |
638264dc | 509 | xdp.rxq = &rq->xdp_rxq; |
9fc8d518 TM |
510 | |
511 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
512 | ||
513 | switch (act) { | |
514 | case XDP_PASS: | |
515 | delta = frame->data - xdp.data; | |
516 | len = xdp.data_end - xdp.data; | |
517 | break; | |
d1396004 TM |
518 | case XDP_TX: |
519 | orig_frame = *frame; | |
520 | xdp.data_hard_start = head; | |
521 | xdp.rxq->mem = frame->mem; | |
638264dc TM |
522 | if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) { |
523 | trace_xdp_exception(rq->dev, xdp_prog, act); | |
d1396004 TM |
524 | frame = &orig_frame; |
525 | goto err_xdp; | |
526 | } | |
527 | *xdp_xmit |= VETH_XDP_TX; | |
528 | rcu_read_unlock(); | |
529 | goto xdp_xmit; | |
530 | case XDP_REDIRECT: | |
531 | orig_frame = *frame; | |
532 | xdp.data_hard_start = head; | |
533 | xdp.rxq->mem = frame->mem; | |
638264dc | 534 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
d1396004 TM |
535 | frame = &orig_frame; |
536 | goto err_xdp; | |
537 | } | |
538 | *xdp_xmit |= VETH_XDP_REDIR; | |
539 | rcu_read_unlock(); | |
540 | goto xdp_xmit; | |
9fc8d518 TM |
541 | default: |
542 | bpf_warn_invalid_xdp_action(act); | |
543 | case XDP_ABORTED: | |
638264dc | 544 | trace_xdp_exception(rq->dev, xdp_prog, act); |
9fc8d518 TM |
545 | case XDP_DROP: |
546 | goto err_xdp; | |
547 | } | |
548 | } | |
549 | rcu_read_unlock(); | |
550 | ||
551 | headroom = sizeof(struct xdp_frame) + frame->headroom - delta; | |
552 | skb = veth_build_skb(head, headroom, len, 0); | |
553 | if (!skb) { | |
554 | xdp_return_frame(frame); | |
555 | goto err; | |
556 | } | |
557 | ||
558 | xdp_scrub_frame(frame); | |
638264dc | 559 | skb->protocol = eth_type_trans(skb, rq->dev); |
9fc8d518 TM |
560 | err: |
561 | return skb; | |
562 | err_xdp: | |
563 | rcu_read_unlock(); | |
564 | xdp_return_frame(frame); | |
d1396004 | 565 | xdp_xmit: |
9fc8d518 TM |
566 | return NULL; |
567 | } | |
568 | ||
638264dc | 569 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, struct sk_buff *skb, |
d1396004 | 570 | unsigned int *xdp_xmit) |
948d4f21 TM |
571 | { |
572 | u32 pktlen, headroom, act, metalen; | |
573 | void *orig_data, *orig_data_end; | |
574 | struct bpf_prog *xdp_prog; | |
575 | int mac_len, delta, off; | |
576 | struct xdp_buff xdp; | |
577 | ||
4bf9ffa0 TM |
578 | skb_orphan(skb); |
579 | ||
948d4f21 | 580 | rcu_read_lock(); |
638264dc | 581 | xdp_prog = rcu_dereference(rq->xdp_prog); |
948d4f21 TM |
582 | if (unlikely(!xdp_prog)) { |
583 | rcu_read_unlock(); | |
584 | goto out; | |
585 | } | |
586 | ||
587 | mac_len = skb->data - skb_mac_header(skb); | |
588 | pktlen = skb->len + mac_len; | |
589 | headroom = skb_headroom(skb) - mac_len; | |
590 | ||
591 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
592 | skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) { | |
593 | struct sk_buff *nskb; | |
594 | int size, head_off; | |
595 | void *head, *start; | |
596 | struct page *page; | |
597 | ||
598 | size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) + | |
599 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
600 | if (size > PAGE_SIZE) | |
601 | goto drop; | |
602 | ||
603 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | |
604 | if (!page) | |
605 | goto drop; | |
606 | ||
607 | head = page_address(page); | |
608 | start = head + VETH_XDP_HEADROOM; | |
609 | if (skb_copy_bits(skb, -mac_len, start, pktlen)) { | |
610 | page_frag_free(head); | |
611 | goto drop; | |
612 | } | |
613 | ||
614 | nskb = veth_build_skb(head, | |
615 | VETH_XDP_HEADROOM + mac_len, skb->len, | |
616 | PAGE_SIZE); | |
617 | if (!nskb) { | |
618 | page_frag_free(head); | |
619 | goto drop; | |
620 | } | |
621 | ||
622 | skb_copy_header(nskb, skb); | |
623 | head_off = skb_headroom(nskb) - skb_headroom(skb); | |
624 | skb_headers_offset_update(nskb, head_off); | |
948d4f21 TM |
625 | consume_skb(skb); |
626 | skb = nskb; | |
627 | } | |
628 | ||
629 | xdp.data_hard_start = skb->head; | |
630 | xdp.data = skb_mac_header(skb); | |
631 | xdp.data_end = xdp.data + pktlen; | |
632 | xdp.data_meta = xdp.data; | |
638264dc | 633 | xdp.rxq = &rq->xdp_rxq; |
948d4f21 TM |
634 | orig_data = xdp.data; |
635 | orig_data_end = xdp.data_end; | |
636 | ||
637 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
638 | ||
639 | switch (act) { | |
640 | case XDP_PASS: | |
641 | break; | |
d1396004 TM |
642 | case XDP_TX: |
643 | get_page(virt_to_page(xdp.data)); | |
644 | consume_skb(skb); | |
638264dc TM |
645 | xdp.rxq->mem = rq->xdp_mem; |
646 | if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) { | |
647 | trace_xdp_exception(rq->dev, xdp_prog, act); | |
d1396004 TM |
648 | goto err_xdp; |
649 | } | |
650 | *xdp_xmit |= VETH_XDP_TX; | |
651 | rcu_read_unlock(); | |
652 | goto xdp_xmit; | |
653 | case XDP_REDIRECT: | |
654 | get_page(virt_to_page(xdp.data)); | |
655 | consume_skb(skb); | |
638264dc TM |
656 | xdp.rxq->mem = rq->xdp_mem; |
657 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) | |
d1396004 TM |
658 | goto err_xdp; |
659 | *xdp_xmit |= VETH_XDP_REDIR; | |
660 | rcu_read_unlock(); | |
661 | goto xdp_xmit; | |
948d4f21 TM |
662 | default: |
663 | bpf_warn_invalid_xdp_action(act); | |
664 | case XDP_ABORTED: | |
638264dc | 665 | trace_xdp_exception(rq->dev, xdp_prog, act); |
948d4f21 TM |
666 | case XDP_DROP: |
667 | goto drop; | |
668 | } | |
669 | rcu_read_unlock(); | |
670 | ||
671 | delta = orig_data - xdp.data; | |
672 | off = mac_len + delta; | |
673 | if (off > 0) | |
674 | __skb_push(skb, off); | |
675 | else if (off < 0) | |
676 | __skb_pull(skb, -off); | |
677 | skb->mac_header -= delta; | |
678 | off = xdp.data_end - orig_data_end; | |
679 | if (off != 0) | |
680 | __skb_put(skb, off); | |
638264dc | 681 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 TM |
682 | |
683 | metalen = xdp.data - xdp.data_meta; | |
684 | if (metalen) | |
685 | skb_metadata_set(skb, metalen); | |
686 | out: | |
687 | return skb; | |
688 | drop: | |
689 | rcu_read_unlock(); | |
690 | kfree_skb(skb); | |
691 | return NULL; | |
d1396004 TM |
692 | err_xdp: |
693 | rcu_read_unlock(); | |
694 | page_frag_free(xdp.data); | |
695 | xdp_xmit: | |
696 | return NULL; | |
948d4f21 TM |
697 | } |
698 | ||
638264dc | 699 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, unsigned int *xdp_xmit) |
948d4f21 | 700 | { |
4195e54a | 701 | int i, done = 0, drops = 0, bytes = 0; |
948d4f21 TM |
702 | |
703 | for (i = 0; i < budget; i++) { | |
638264dc | 704 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
4195e54a | 705 | unsigned int xdp_xmit_one = 0; |
9fc8d518 | 706 | struct sk_buff *skb; |
948d4f21 | 707 | |
9fc8d518 | 708 | if (!ptr) |
948d4f21 TM |
709 | break; |
710 | ||
d1396004 | 711 | if (veth_is_xdp_frame(ptr)) { |
4195e54a TM |
712 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
713 | ||
714 | bytes += frame->len; | |
715 | skb = veth_xdp_rcv_one(rq, frame, &xdp_xmit_one); | |
d1396004 | 716 | } else { |
4195e54a TM |
717 | skb = ptr; |
718 | bytes += skb->len; | |
719 | skb = veth_xdp_rcv_skb(rq, skb, &xdp_xmit_one); | |
d1396004 | 720 | } |
4195e54a | 721 | *xdp_xmit |= xdp_xmit_one; |
948d4f21 TM |
722 | |
723 | if (skb) | |
638264dc | 724 | napi_gro_receive(&rq->xdp_napi, skb); |
4195e54a TM |
725 | else if (!xdp_xmit_one) |
726 | drops++; | |
948d4f21 TM |
727 | |
728 | done++; | |
729 | } | |
730 | ||
4195e54a TM |
731 | u64_stats_update_begin(&rq->stats.syncp); |
732 | rq->stats.xdp_packets += done; | |
733 | rq->stats.xdp_bytes += bytes; | |
734 | rq->stats.xdp_drops += drops; | |
735 | u64_stats_update_end(&rq->stats.syncp); | |
736 | ||
948d4f21 TM |
737 | return done; |
738 | } | |
739 | ||
740 | static int veth_poll(struct napi_struct *napi, int budget) | |
741 | { | |
638264dc TM |
742 | struct veth_rq *rq = |
743 | container_of(napi, struct veth_rq, xdp_napi); | |
d1396004 | 744 | unsigned int xdp_xmit = 0; |
948d4f21 TM |
745 | int done; |
746 | ||
d1396004 | 747 | xdp_set_return_frame_no_direct(); |
638264dc | 748 | done = veth_xdp_rcv(rq, budget, &xdp_xmit); |
948d4f21 TM |
749 | |
750 | if (done < budget && napi_complete_done(napi, done)) { | |
751 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
752 | smp_store_mb(rq->rx_notify_masked, false); |
753 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
754 | rq->rx_notify_masked = true; | |
755 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
756 | } |
757 | } | |
758 | ||
d1396004 | 759 | if (xdp_xmit & VETH_XDP_TX) |
638264dc | 760 | veth_xdp_flush(rq->dev); |
d1396004 TM |
761 | if (xdp_xmit & VETH_XDP_REDIR) |
762 | xdp_do_flush_map(); | |
763 | xdp_clear_return_frame_no_direct(); | |
764 | ||
948d4f21 TM |
765 | return done; |
766 | } | |
767 | ||
768 | static int veth_napi_add(struct net_device *dev) | |
769 | { | |
770 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 771 | int err, i; |
948d4f21 | 772 | |
638264dc TM |
773 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
774 | struct veth_rq *rq = &priv->rq[i]; | |
775 | ||
776 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
777 | if (err) | |
778 | goto err_xdp_ring; | |
779 | } | |
948d4f21 | 780 | |
638264dc TM |
781 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
782 | struct veth_rq *rq = &priv->rq[i]; | |
783 | ||
784 | netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT); | |
785 | napi_enable(&rq->xdp_napi); | |
786 | } | |
948d4f21 TM |
787 | |
788 | return 0; | |
638264dc TM |
789 | err_xdp_ring: |
790 | for (i--; i >= 0; i--) | |
791 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); | |
792 | ||
793 | return err; | |
948d4f21 TM |
794 | } |
795 | ||
796 | static void veth_napi_del(struct net_device *dev) | |
797 | { | |
798 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 799 | int i; |
948d4f21 | 800 | |
638264dc TM |
801 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
802 | struct veth_rq *rq = &priv->rq[i]; | |
803 | ||
804 | napi_disable(&rq->xdp_napi); | |
805 | napi_hash_del(&rq->xdp_napi); | |
806 | } | |
807 | synchronize_net(); | |
808 | ||
809 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
810 | struct veth_rq *rq = &priv->rq[i]; | |
811 | ||
812 | netif_napi_del(&rq->xdp_napi); | |
813 | rq->rx_notify_masked = false; | |
814 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
815 | } | |
948d4f21 TM |
816 | } |
817 | ||
818 | static int veth_enable_xdp(struct net_device *dev) | |
819 | { | |
820 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 821 | int err, i; |
948d4f21 | 822 | |
638264dc TM |
823 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { |
824 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
825 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 826 | |
638264dc TM |
827 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i); |
828 | if (err < 0) | |
829 | goto err_rxq_reg; | |
830 | ||
831 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
832 | MEM_TYPE_PAGE_SHARED, | |
833 | NULL); | |
834 | if (err < 0) | |
835 | goto err_reg_mem; | |
836 | ||
837 | /* Save original mem info as it can be overwritten */ | |
838 | rq->xdp_mem = rq->xdp_rxq.mem; | |
839 | } | |
948d4f21 TM |
840 | |
841 | err = veth_napi_add(dev); | |
842 | if (err) | |
638264dc | 843 | goto err_rxq_reg; |
948d4f21 TM |
844 | } |
845 | ||
638264dc TM |
846 | for (i = 0; i < dev->real_num_rx_queues; i++) |
847 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); | |
948d4f21 TM |
848 | |
849 | return 0; | |
638264dc TM |
850 | err_reg_mem: |
851 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
852 | err_rxq_reg: | |
853 | for (i--; i >= 0; i--) | |
854 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
948d4f21 TM |
855 | |
856 | return err; | |
857 | } | |
858 | ||
859 | static void veth_disable_xdp(struct net_device *dev) | |
860 | { | |
861 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 862 | int i; |
948d4f21 | 863 | |
638264dc TM |
864 | for (i = 0; i < dev->real_num_rx_queues; i++) |
865 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
948d4f21 | 866 | veth_napi_del(dev); |
638264dc TM |
867 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
868 | struct veth_rq *rq = &priv->rq[i]; | |
869 | ||
870 | rq->xdp_rxq.mem = rq->xdp_mem; | |
871 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
872 | } | |
948d4f21 TM |
873 | } |
874 | ||
e314dbdc PE |
875 | static int veth_open(struct net_device *dev) |
876 | { | |
d0e2c55e ED |
877 | struct veth_priv *priv = netdev_priv(dev); |
878 | struct net_device *peer = rtnl_dereference(priv->peer); | |
948d4f21 | 879 | int err; |
e314dbdc | 880 | |
d0e2c55e | 881 | if (!peer) |
e314dbdc PE |
882 | return -ENOTCONN; |
883 | ||
948d4f21 TM |
884 | if (priv->_xdp_prog) { |
885 | err = veth_enable_xdp(dev); | |
886 | if (err) | |
887 | return err; | |
888 | } | |
889 | ||
d0e2c55e | 890 | if (peer->flags & IFF_UP) { |
e314dbdc | 891 | netif_carrier_on(dev); |
d0e2c55e | 892 | netif_carrier_on(peer); |
e314dbdc | 893 | } |
948d4f21 | 894 | |
e314dbdc PE |
895 | return 0; |
896 | } | |
897 | ||
2cf48a10 EB |
898 | static int veth_close(struct net_device *dev) |
899 | { | |
900 | struct veth_priv *priv = netdev_priv(dev); | |
2efd32ee | 901 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
902 | |
903 | netif_carrier_off(dev); | |
2efd32ee ED |
904 | if (peer) |
905 | netif_carrier_off(peer); | |
2cf48a10 | 906 | |
948d4f21 TM |
907 | if (priv->_xdp_prog) |
908 | veth_disable_xdp(dev); | |
909 | ||
2cf48a10 EB |
910 | return 0; |
911 | } | |
912 | ||
91572088 | 913 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 914 | { |
91572088 | 915 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
916 | } |
917 | ||
7797b93b TM |
918 | static int veth_alloc_queues(struct net_device *dev) |
919 | { | |
920 | struct veth_priv *priv = netdev_priv(dev); | |
921 | int i; | |
922 | ||
923 | priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL); | |
924 | if (!priv->rq) | |
925 | return -ENOMEM; | |
926 | ||
4195e54a | 927 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 928 | priv->rq[i].dev = dev; |
4195e54a TM |
929 | u64_stats_init(&priv->rq[i].stats.syncp); |
930 | } | |
7797b93b TM |
931 | |
932 | return 0; | |
933 | } | |
934 | ||
935 | static void veth_free_queues(struct net_device *dev) | |
936 | { | |
937 | struct veth_priv *priv = netdev_priv(dev); | |
938 | ||
939 | kfree(priv->rq); | |
940 | } | |
941 | ||
e314dbdc PE |
942 | static int veth_dev_init(struct net_device *dev) |
943 | { | |
7797b93b TM |
944 | int err; |
945 | ||
14d73416 LR |
946 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
947 | if (!dev->lstats) | |
e314dbdc | 948 | return -ENOMEM; |
7797b93b TM |
949 | |
950 | err = veth_alloc_queues(dev); | |
951 | if (err) { | |
14d73416 | 952 | free_percpu(dev->lstats); |
7797b93b TM |
953 | return err; |
954 | } | |
955 | ||
e314dbdc PE |
956 | return 0; |
957 | } | |
958 | ||
11687a10 DM |
959 | static void veth_dev_free(struct net_device *dev) |
960 | { | |
7797b93b | 961 | veth_free_queues(dev); |
14d73416 | 962 | free_percpu(dev->lstats); |
11687a10 DM |
963 | } |
964 | ||
bb446c19 WC |
965 | #ifdef CONFIG_NET_POLL_CONTROLLER |
966 | static void veth_poll_controller(struct net_device *dev) | |
967 | { | |
968 | /* veth only receives frames when its peer sends one | |
948d4f21 | 969 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
970 | * never to have pending data when we poll for it so |
971 | * there is nothing to do here. | |
972 | * | |
973 | * We need this though so netpoll recognizes us as an interface that | |
974 | * supports polling, which enables bridge devices in virt setups to | |
975 | * still use netconsole | |
976 | */ | |
977 | } | |
978 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
979 | ||
a45253bf ND |
980 | static int veth_get_iflink(const struct net_device *dev) |
981 | { | |
982 | struct veth_priv *priv = netdev_priv(dev); | |
983 | struct net_device *peer; | |
984 | int iflink; | |
985 | ||
986 | rcu_read_lock(); | |
987 | peer = rcu_dereference(priv->peer); | |
988 | iflink = peer ? peer->ifindex : 0; | |
989 | rcu_read_unlock(); | |
990 | ||
991 | return iflink; | |
992 | } | |
993 | ||
dc224822 TM |
994 | static netdev_features_t veth_fix_features(struct net_device *dev, |
995 | netdev_features_t features) | |
996 | { | |
997 | struct veth_priv *priv = netdev_priv(dev); | |
998 | struct net_device *peer; | |
999 | ||
1000 | peer = rtnl_dereference(priv->peer); | |
1001 | if (peer) { | |
1002 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1003 | ||
1004 | if (peer_priv->_xdp_prog) | |
1005 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1006 | } | |
1007 | ||
1008 | return features; | |
1009 | } | |
1010 | ||
163e5292 PA |
1011 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1012 | { | |
1013 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1014 | struct net_device *peer; | |
1015 | ||
1016 | if (new_hr < 0) | |
1017 | new_hr = 0; | |
1018 | ||
1019 | rcu_read_lock(); | |
1020 | peer = rcu_dereference(priv->peer); | |
1021 | if (unlikely(!peer)) | |
1022 | goto out; | |
1023 | ||
1024 | peer_priv = netdev_priv(peer); | |
1025 | priv->requested_headroom = new_hr; | |
1026 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1027 | dev->needed_headroom = new_hr; | |
1028 | peer->needed_headroom = new_hr; | |
1029 | ||
1030 | out: | |
1031 | rcu_read_unlock(); | |
1032 | } | |
1033 | ||
948d4f21 TM |
1034 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1035 | struct netlink_ext_ack *extack) | |
1036 | { | |
1037 | struct veth_priv *priv = netdev_priv(dev); | |
1038 | struct bpf_prog *old_prog; | |
1039 | struct net_device *peer; | |
dc224822 | 1040 | unsigned int max_mtu; |
948d4f21 TM |
1041 | int err; |
1042 | ||
1043 | old_prog = priv->_xdp_prog; | |
1044 | priv->_xdp_prog = prog; | |
1045 | peer = rtnl_dereference(priv->peer); | |
1046 | ||
1047 | if (prog) { | |
1048 | if (!peer) { | |
1049 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1050 | err = -ENOTCONN; | |
1051 | goto err; | |
1052 | } | |
1053 | ||
dc224822 TM |
1054 | max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM - |
1055 | peer->hard_header_len - | |
1056 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1057 | if (peer->mtu > max_mtu) { | |
1058 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1059 | err = -ERANGE; | |
1060 | goto err; | |
1061 | } | |
1062 | ||
638264dc TM |
1063 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1064 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1065 | err = -ENOSPC; | |
1066 | goto err; | |
1067 | } | |
1068 | ||
948d4f21 TM |
1069 | if (dev->flags & IFF_UP) { |
1070 | err = veth_enable_xdp(dev); | |
1071 | if (err) { | |
1072 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1073 | goto err; | |
1074 | } | |
1075 | } | |
dc224822 TM |
1076 | |
1077 | if (!old_prog) { | |
1078 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1079 | peer->max_mtu = max_mtu; | |
1080 | } | |
948d4f21 TM |
1081 | } |
1082 | ||
1083 | if (old_prog) { | |
dc224822 TM |
1084 | if (!prog) { |
1085 | if (dev->flags & IFF_UP) | |
1086 | veth_disable_xdp(dev); | |
1087 | ||
1088 | if (peer) { | |
1089 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1090 | peer->max_mtu = ETH_MAX_MTU; | |
1091 | } | |
1092 | } | |
948d4f21 TM |
1093 | bpf_prog_put(old_prog); |
1094 | } | |
1095 | ||
dc224822 TM |
1096 | if ((!!old_prog ^ !!prog) && peer) |
1097 | netdev_update_features(peer); | |
1098 | ||
948d4f21 TM |
1099 | return 0; |
1100 | err: | |
1101 | priv->_xdp_prog = old_prog; | |
1102 | ||
1103 | return err; | |
1104 | } | |
1105 | ||
1106 | static u32 veth_xdp_query(struct net_device *dev) | |
1107 | { | |
1108 | struct veth_priv *priv = netdev_priv(dev); | |
1109 | const struct bpf_prog *xdp_prog; | |
1110 | ||
1111 | xdp_prog = priv->_xdp_prog; | |
1112 | if (xdp_prog) | |
1113 | return xdp_prog->aux->id; | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) | |
1119 | { | |
1120 | switch (xdp->command) { | |
1121 | case XDP_SETUP_PROG: | |
1122 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
1123 | case XDP_QUERY_PROG: | |
1124 | xdp->prog_id = veth_xdp_query(dev); | |
1125 | return 0; | |
1126 | default: | |
1127 | return -EINVAL; | |
1128 | } | |
1129 | } | |
1130 | ||
4456e7bd | 1131 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1132 | .ndo_init = veth_dev_init, |
1133 | .ndo_open = veth_open, | |
2cf48a10 | 1134 | .ndo_stop = veth_close, |
ee923623 | 1135 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1136 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1137 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1138 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1139 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1140 | .ndo_poll_controller = veth_poll_controller, | |
1141 | #endif | |
a45253bf | 1142 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1143 | .ndo_fix_features = veth_fix_features, |
1a04a821 | 1144 | .ndo_features_check = passthru_features_check, |
163e5292 | 1145 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1146 | .ndo_bpf = veth_xdp, |
af87a3aa | 1147 | .ndo_xdp_xmit = veth_xdp_xmit, |
4456e7bd SH |
1148 | }; |
1149 | ||
732912d7 | 1150 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1151 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1152 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1153 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1154 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1155 | |
e314dbdc PE |
1156 | static void veth_setup(struct net_device *dev) |
1157 | { | |
1158 | ether_setup(dev); | |
1159 | ||
550fd08c | 1160 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1161 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1162 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1163 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1164 | |
4456e7bd | 1165 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
1166 | dev->ethtool_ops = &veth_ethtool_ops; |
1167 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1168 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1169 | dev->vlan_features = dev->features & |
3f8c707b VY |
1170 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1171 | NETIF_F_HW_VLAN_STAG_TX | | |
1172 | NETIF_F_HW_VLAN_CTAG_RX | | |
1173 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1174 | dev->needs_free_netdev = true; |
1175 | dev->priv_destructor = veth_dev_free; | |
91572088 | 1176 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1177 | |
8093315a | 1178 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1179 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1180 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
e314dbdc PE |
1181 | } |
1182 | ||
1183 | /* | |
1184 | * netlink interface | |
1185 | */ | |
1186 | ||
a8b8a889 MS |
1187 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1188 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1189 | { |
1190 | if (tb[IFLA_ADDRESS]) { | |
1191 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1192 | return -EINVAL; | |
1193 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1194 | return -EADDRNOTAVAIL; | |
1195 | } | |
38d40815 EB |
1196 | if (tb[IFLA_MTU]) { |
1197 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1198 | return -EINVAL; | |
1199 | } | |
e314dbdc PE |
1200 | return 0; |
1201 | } | |
1202 | ||
1203 | static struct rtnl_link_ops veth_link_ops; | |
1204 | ||
81adee47 | 1205 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1206 | struct nlattr *tb[], struct nlattr *data[], |
1207 | struct netlink_ext_ack *extack) | |
e314dbdc | 1208 | { |
7797b93b | 1209 | int err; |
e314dbdc PE |
1210 | struct net_device *peer; |
1211 | struct veth_priv *priv; | |
1212 | char ifname[IFNAMSIZ]; | |
1213 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1214 | unsigned char name_assign_type; |
3729d502 | 1215 | struct ifinfomsg *ifmp; |
81adee47 | 1216 | struct net *net; |
e314dbdc PE |
1217 | |
1218 | /* | |
1219 | * create and register peer first | |
e314dbdc | 1220 | */ |
e314dbdc PE |
1221 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1222 | struct nlattr *nla_peer; | |
1223 | ||
1224 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1225 | ifmp = nla_data(nla_peer); |
f7b12606 JP |
1226 | err = rtnl_nla_parse_ifla(peer_tb, |
1227 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
fceb6435 JB |
1228 | nla_len(nla_peer) - sizeof(struct ifinfomsg), |
1229 | NULL); | |
e314dbdc PE |
1230 | if (err < 0) |
1231 | return err; | |
1232 | ||
a8b8a889 | 1233 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1234 | if (err < 0) |
1235 | return err; | |
1236 | ||
1237 | tbp = peer_tb; | |
3729d502 PM |
1238 | } else { |
1239 | ifmp = NULL; | |
e314dbdc | 1240 | tbp = tb; |
3729d502 | 1241 | } |
e314dbdc | 1242 | |
191cdb38 | 1243 | if (ifmp && tbp[IFLA_IFNAME]) { |
e314dbdc | 1244 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1245 | name_assign_type = NET_NAME_USER; |
1246 | } else { | |
e314dbdc | 1247 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1248 | name_assign_type = NET_NAME_ENUM; |
1249 | } | |
e314dbdc | 1250 | |
81adee47 EB |
1251 | net = rtnl_link_get_net(src_net, tbp); |
1252 | if (IS_ERR(net)) | |
1253 | return PTR_ERR(net); | |
1254 | ||
5517750f | 1255 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1256 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1257 | if (IS_ERR(peer)) { |
1258 | put_net(net); | |
e314dbdc | 1259 | return PTR_ERR(peer); |
81adee47 | 1260 | } |
e314dbdc | 1261 | |
191cdb38 | 1262 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1263 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1264 | |
1265 | if (ifmp && (dev->ifindex != 0)) | |
1266 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1267 | |
72d24955 SH |
1268 | peer->gso_max_size = dev->gso_max_size; |
1269 | peer->gso_max_segs = dev->gso_max_segs; | |
1270 | ||
e314dbdc | 1271 | err = register_netdevice(peer); |
81adee47 EB |
1272 | put_net(net); |
1273 | net = NULL; | |
e314dbdc PE |
1274 | if (err < 0) |
1275 | goto err_register_peer; | |
1276 | ||
1277 | netif_carrier_off(peer); | |
1278 | ||
3729d502 PM |
1279 | err = rtnl_configure_link(peer, ifmp); |
1280 | if (err < 0) | |
1281 | goto err_configure_peer; | |
1282 | ||
e314dbdc PE |
1283 | /* |
1284 | * register dev last | |
1285 | * | |
1286 | * note, that since we've registered new device the dev's name | |
1287 | * should be re-allocated | |
1288 | */ | |
1289 | ||
1290 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1291 | eth_hw_addr_random(dev); |
e314dbdc | 1292 | |
6c8c4446 JP |
1293 | if (tb[IFLA_IFNAME]) |
1294 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); | |
1295 | else | |
1296 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1297 | ||
e314dbdc PE |
1298 | err = register_netdevice(dev); |
1299 | if (err < 0) | |
1300 | goto err_register_dev; | |
1301 | ||
1302 | netif_carrier_off(dev); | |
1303 | ||
1304 | /* | |
1305 | * tie the deviced together | |
1306 | */ | |
1307 | ||
1308 | priv = netdev_priv(dev); | |
d0e2c55e | 1309 | rcu_assign_pointer(priv->peer, peer); |
e314dbdc PE |
1310 | |
1311 | priv = netdev_priv(peer); | |
d0e2c55e | 1312 | rcu_assign_pointer(priv->peer, dev); |
948d4f21 | 1313 | |
e314dbdc PE |
1314 | return 0; |
1315 | ||
1316 | err_register_dev: | |
1317 | /* nothing to do */ | |
3729d502 | 1318 | err_configure_peer: |
e314dbdc PE |
1319 | unregister_netdevice(peer); |
1320 | return err; | |
1321 | ||
1322 | err_register_peer: | |
1323 | free_netdev(peer); | |
1324 | return err; | |
1325 | } | |
1326 | ||
23289a37 | 1327 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1328 | { |
1329 | struct veth_priv *priv; | |
1330 | struct net_device *peer; | |
1331 | ||
1332 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1333 | peer = rtnl_dereference(priv->peer); |
1334 | ||
1335 | /* Note : dellink() is called from default_device_exit_batch(), | |
1336 | * before a rcu_synchronize() point. The devices are guaranteed | |
1337 | * not being freed before one RCU grace period. | |
1338 | */ | |
1339 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1340 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1341 | |
1342 | if (peer) { | |
1343 | priv = netdev_priv(peer); | |
1344 | RCU_INIT_POINTER(priv->peer, NULL); | |
1345 | unregister_netdevice_queue(peer, head); | |
1346 | } | |
e314dbdc PE |
1347 | } |
1348 | ||
23711438 TG |
1349 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
1350 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
1351 | }; | |
e314dbdc | 1352 | |
e5f4e7b9 ND |
1353 | static struct net *veth_get_link_net(const struct net_device *dev) |
1354 | { | |
1355 | struct veth_priv *priv = netdev_priv(dev); | |
1356 | struct net_device *peer = rtnl_dereference(priv->peer); | |
1357 | ||
1358 | return peer ? dev_net(peer) : dev_net(dev); | |
1359 | } | |
1360 | ||
e314dbdc PE |
1361 | static struct rtnl_link_ops veth_link_ops = { |
1362 | .kind = DRV_NAME, | |
1363 | .priv_size = sizeof(struct veth_priv), | |
1364 | .setup = veth_setup, | |
1365 | .validate = veth_validate, | |
1366 | .newlink = veth_newlink, | |
1367 | .dellink = veth_dellink, | |
1368 | .policy = veth_policy, | |
1369 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 1370 | .get_link_net = veth_get_link_net, |
e314dbdc PE |
1371 | }; |
1372 | ||
1373 | /* | |
1374 | * init/fini | |
1375 | */ | |
1376 | ||
1377 | static __init int veth_init(void) | |
1378 | { | |
1379 | return rtnl_link_register(&veth_link_ops); | |
1380 | } | |
1381 | ||
1382 | static __exit void veth_exit(void) | |
1383 | { | |
68365458 | 1384 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
1385 | } |
1386 | ||
1387 | module_init(veth_init); | |
1388 | module_exit(veth_exit); | |
1389 | ||
1390 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
1391 | MODULE_LICENSE("GPL v2"); | |
1392 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |