Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e314dbdc PE |
2 | /* |
3 | * drivers/net/veth.c | |
4 | * | |
5 | * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc | |
6 | * | |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> | |
9 | * | |
10 | */ | |
11 | ||
e314dbdc | 12 | #include <linux/netdevice.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
e314dbdc PE |
14 | #include <linux/ethtool.h> |
15 | #include <linux/etherdevice.h> | |
cf05c700 | 16 | #include <linux/u64_stats_sync.h> |
e314dbdc | 17 | |
f7b12606 | 18 | #include <net/rtnetlink.h> |
e314dbdc PE |
19 | #include <net/dst.h> |
20 | #include <net/xfrm.h> | |
af87a3aa | 21 | #include <net/xdp.h> |
ecef969e | 22 | #include <linux/veth.h> |
9d9779e7 | 23 | #include <linux/module.h> |
948d4f21 TM |
24 | #include <linux/bpf.h> |
25 | #include <linux/filter.h> | |
26 | #include <linux/ptr_ring.h> | |
948d4f21 | 27 | #include <linux/bpf_trace.h> |
aa4e689e | 28 | #include <linux/net_tstamp.h> |
a9ca9f9c | 29 | #include <net/page_pool/helpers.h> |
e314dbdc PE |
30 | |
31 | #define DRV_NAME "veth" | |
32 | #define DRV_VERSION "1.0" | |
33 | ||
9fc8d518 | 34 | #define VETH_XDP_FLAG BIT(0) |
948d4f21 TM |
35 | #define VETH_RING_SIZE 256 |
36 | #define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN) | |
37 | ||
9cda7807 | 38 | #define VETH_XDP_TX_BULK_SIZE 16 |
65e6dcf7 | 39 | #define VETH_XDP_BATCH 16 |
9cda7807 | 40 | |
65780c56 | 41 | struct veth_stats { |
1c5b82e5 LB |
42 | u64 rx_drops; |
43 | /* xdp */ | |
65780c56 LB |
44 | u64 xdp_packets; |
45 | u64 xdp_bytes; | |
1c5b82e5 | 46 | u64 xdp_redirect; |
65780c56 | 47 | u64 xdp_drops; |
1c5b82e5 | 48 | u64 xdp_tx; |
9152cff0 | 49 | u64 xdp_tx_err; |
5fe6e567 LB |
50 | u64 peer_tq_xdp_xmit; |
51 | u64 peer_tq_xdp_xmit_err; | |
65780c56 LB |
52 | }; |
53 | ||
4195e54a | 54 | struct veth_rq_stats { |
65780c56 | 55 | struct veth_stats vs; |
4195e54a TM |
56 | struct u64_stats_sync syncp; |
57 | }; | |
58 | ||
638264dc | 59 | struct veth_rq { |
948d4f21 | 60 | struct napi_struct xdp_napi; |
d3256efd | 61 | struct napi_struct __rcu *napi; /* points to xdp_napi when the latter is initialized */ |
948d4f21 TM |
62 | struct net_device *dev; |
63 | struct bpf_prog __rcu *xdp_prog; | |
d1396004 | 64 | struct xdp_mem_info xdp_mem; |
4195e54a | 65 | struct veth_rq_stats stats; |
948d4f21 TM |
66 | bool rx_notify_masked; |
67 | struct ptr_ring xdp_ring; | |
68 | struct xdp_rxq_info xdp_rxq; | |
0ebab78c | 69 | struct page_pool *page_pool; |
e314dbdc PE |
70 | }; |
71 | ||
638264dc TM |
72 | struct veth_priv { |
73 | struct net_device __rcu *peer; | |
74 | atomic64_t dropped; | |
75 | struct bpf_prog *_xdp_prog; | |
76 | struct veth_rq *rq; | |
77 | unsigned int requested_headroom; | |
78 | }; | |
79 | ||
9cda7807 TM |
80 | struct veth_xdp_tx_bq { |
81 | struct xdp_frame *q[VETH_XDP_TX_BULK_SIZE]; | |
82 | unsigned int count; | |
83 | }; | |
84 | ||
e314dbdc PE |
85 | /* |
86 | * ethtool interface | |
87 | */ | |
88 | ||
d397b968 TM |
89 | struct veth_q_stat_desc { |
90 | char desc[ETH_GSTRING_LEN]; | |
91 | size_t offset; | |
92 | }; | |
93 | ||
65780c56 | 94 | #define VETH_RQ_STAT(m) offsetof(struct veth_stats, m) |
d397b968 TM |
95 | |
96 | static const struct veth_q_stat_desc veth_rq_stats_desc[] = { | |
97 | { "xdp_packets", VETH_RQ_STAT(xdp_packets) }, | |
98 | { "xdp_bytes", VETH_RQ_STAT(xdp_bytes) }, | |
5fe6e567 LB |
99 | { "drops", VETH_RQ_STAT(rx_drops) }, |
100 | { "xdp_redirect", VETH_RQ_STAT(xdp_redirect) }, | |
101 | { "xdp_drops", VETH_RQ_STAT(xdp_drops) }, | |
102 | { "xdp_tx", VETH_RQ_STAT(xdp_tx) }, | |
103 | { "xdp_tx_errors", VETH_RQ_STAT(xdp_tx_err) }, | |
d397b968 TM |
104 | }; |
105 | ||
106 | #define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc) | |
107 | ||
5fe6e567 LB |
108 | static const struct veth_q_stat_desc veth_tq_stats_desc[] = { |
109 | { "xdp_xmit", VETH_RQ_STAT(peer_tq_xdp_xmit) }, | |
110 | { "xdp_xmit_errors", VETH_RQ_STAT(peer_tq_xdp_xmit_err) }, | |
111 | }; | |
112 | ||
113 | #define VETH_TQ_STATS_LEN ARRAY_SIZE(veth_tq_stats_desc) | |
114 | ||
e314dbdc PE |
115 | static struct { |
116 | const char string[ETH_GSTRING_LEN]; | |
117 | } ethtool_stats_keys[] = { | |
118 | { "peer_ifindex" }, | |
119 | }; | |
120 | ||
fefb695a SF |
121 | struct veth_xdp_buff { |
122 | struct xdp_buff xdp; | |
306531f0 | 123 | struct sk_buff *skb; |
fefb695a SF |
124 | }; |
125 | ||
56607b98 PR |
126 | static int veth_get_link_ksettings(struct net_device *dev, |
127 | struct ethtool_link_ksettings *cmd) | |
e314dbdc | 128 | { |
56607b98 PR |
129 | cmd->base.speed = SPEED_10000; |
130 | cmd->base.duplex = DUPLEX_FULL; | |
131 | cmd->base.port = PORT_TP; | |
132 | cmd->base.autoneg = AUTONEG_DISABLE; | |
e314dbdc PE |
133 | return 0; |
134 | } | |
135 | ||
136 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
137 | { | |
fb3ceec1 WS |
138 | strscpy(info->driver, DRV_NAME, sizeof(info->driver)); |
139 | strscpy(info->version, DRV_VERSION, sizeof(info->version)); | |
e314dbdc PE |
140 | } |
141 | ||
142 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
143 | { | |
a0341b73 | 144 | u8 *p = buf; |
d397b968 TM |
145 | int i, j; |
146 | ||
e314dbdc PE |
147 | switch(stringset) { |
148 | case ETH_SS_STATS: | |
d397b968 TM |
149 | memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
150 | p += sizeof(ethtool_stats_keys); | |
a0341b73 TZ |
151 | for (i = 0; i < dev->real_num_rx_queues; i++) |
152 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) | |
153 | ethtool_sprintf(&p, "rx_queue_%u_%.18s", | |
154 | i, veth_rq_stats_desc[j].desc); | |
155 | ||
156 | for (i = 0; i < dev->real_num_tx_queues; i++) | |
157 | for (j = 0; j < VETH_TQ_STATS_LEN; j++) | |
158 | ethtool_sprintf(&p, "tx_queue_%u_%.18s", | |
159 | i, veth_tq_stats_desc[j].desc); | |
4fc41805 LB |
160 | |
161 | page_pool_ethtool_stats_get_strings(p); | |
e314dbdc PE |
162 | break; |
163 | } | |
164 | } | |
165 | ||
b9f2c044 | 166 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 167 | { |
b9f2c044 JG |
168 | switch (sset) { |
169 | case ETH_SS_STATS: | |
d397b968 | 170 | return ARRAY_SIZE(ethtool_stats_keys) + |
5fe6e567 | 171 | VETH_RQ_STATS_LEN * dev->real_num_rx_queues + |
4fc41805 LB |
172 | VETH_TQ_STATS_LEN * dev->real_num_tx_queues + |
173 | page_pool_ethtool_stats_get_count(); | |
b9f2c044 JG |
174 | default: |
175 | return -EOPNOTSUPP; | |
176 | } | |
e314dbdc PE |
177 | } |
178 | ||
5e316a81 LB |
179 | static void veth_get_page_pool_stats(struct net_device *dev, u64 *data) |
180 | { | |
181 | #ifdef CONFIG_PAGE_POOL_STATS | |
182 | struct veth_priv *priv = netdev_priv(dev); | |
183 | struct page_pool_stats pp_stats = {}; | |
184 | int i; | |
185 | ||
186 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
187 | if (!priv->rq[i].page_pool) | |
188 | continue; | |
189 | page_pool_get_stats(priv->rq[i].page_pool, &pp_stats); | |
190 | } | |
191 | page_pool_ethtool_stats_get(data, &pp_stats); | |
192 | #endif /* CONFIG_PAGE_POOL_STATS */ | |
193 | } | |
194 | ||
e314dbdc PE |
195 | static void veth_get_ethtool_stats(struct net_device *dev, |
196 | struct ethtool_stats *stats, u64 *data) | |
197 | { | |
5fe6e567 | 198 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); |
d0e2c55e | 199 | struct net_device *peer = rtnl_dereference(priv->peer); |
4fc41805 | 200 | int i, j, idx, pp_idx; |
e314dbdc | 201 | |
d0e2c55e | 202 | data[0] = peer ? peer->ifindex : 0; |
d397b968 TM |
203 | idx = 1; |
204 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
205 | const struct veth_rq_stats *rq_stats = &priv->rq[i].stats; | |
65780c56 | 206 | const void *stats_base = (void *)&rq_stats->vs; |
d397b968 TM |
207 | unsigned int start; |
208 | size_t offset; | |
209 | ||
210 | do { | |
068c38ad | 211 | start = u64_stats_fetch_begin(&rq_stats->syncp); |
d397b968 TM |
212 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { |
213 | offset = veth_rq_stats_desc[j].offset; | |
214 | data[idx + j] = *(u64 *)(stats_base + offset); | |
215 | } | |
068c38ad | 216 | } while (u64_stats_fetch_retry(&rq_stats->syncp, start)); |
d397b968 TM |
217 | idx += VETH_RQ_STATS_LEN; |
218 | } | |
4fc41805 | 219 | pp_idx = idx; |
5fe6e567 LB |
220 | |
221 | if (!peer) | |
4fc41805 | 222 | goto page_pool_stats; |
5fe6e567 LB |
223 | |
224 | rcv_priv = netdev_priv(peer); | |
225 | for (i = 0; i < peer->real_num_rx_queues; i++) { | |
226 | const struct veth_rq_stats *rq_stats = &rcv_priv->rq[i].stats; | |
227 | const void *base = (void *)&rq_stats->vs; | |
228 | unsigned int start, tx_idx = idx; | |
229 | size_t offset; | |
230 | ||
231 | tx_idx += (i % dev->real_num_tx_queues) * VETH_TQ_STATS_LEN; | |
232 | do { | |
068c38ad | 233 | start = u64_stats_fetch_begin(&rq_stats->syncp); |
5fe6e567 LB |
234 | for (j = 0; j < VETH_TQ_STATS_LEN; j++) { |
235 | offset = veth_tq_stats_desc[j].offset; | |
236 | data[tx_idx + j] += *(u64 *)(base + offset); | |
237 | } | |
068c38ad | 238 | } while (u64_stats_fetch_retry(&rq_stats->syncp, start)); |
4fc41805 LB |
239 | pp_idx = tx_idx + VETH_TQ_STATS_LEN; |
240 | } | |
241 | ||
242 | page_pool_stats: | |
5e316a81 | 243 | veth_get_page_pool_stats(dev, &data[pp_idx]); |
e314dbdc PE |
244 | } |
245 | ||
34829eec MF |
246 | static void veth_get_channels(struct net_device *dev, |
247 | struct ethtool_channels *channels) | |
248 | { | |
249 | channels->tx_count = dev->real_num_tx_queues; | |
250 | channels->rx_count = dev->real_num_rx_queues; | |
4752eeb3 PA |
251 | channels->max_tx = dev->num_tx_queues; |
252 | channels->max_rx = dev->num_rx_queues; | |
34829eec MF |
253 | } |
254 | ||
4752eeb3 PA |
255 | static int veth_set_channels(struct net_device *dev, |
256 | struct ethtool_channels *ch); | |
257 | ||
0fc0b732 | 258 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
259 | .get_drvinfo = veth_get_drvinfo, |
260 | .get_link = ethtool_op_get_link, | |
e314dbdc | 261 | .get_strings = veth_get_strings, |
b9f2c044 | 262 | .get_sset_count = veth_get_sset_count, |
e314dbdc | 263 | .get_ethtool_stats = veth_get_ethtool_stats, |
56607b98 | 264 | .get_link_ksettings = veth_get_link_ksettings, |
056b21fb | 265 | .get_ts_info = ethtool_op_get_ts_info, |
34829eec | 266 | .get_channels = veth_get_channels, |
4752eeb3 | 267 | .set_channels = veth_set_channels, |
e314dbdc PE |
268 | }; |
269 | ||
948d4f21 TM |
270 | /* general routines */ |
271 | ||
9fc8d518 TM |
272 | static bool veth_is_xdp_frame(void *ptr) |
273 | { | |
274 | return (unsigned long)ptr & VETH_XDP_FLAG; | |
275 | } | |
276 | ||
defcffeb | 277 | static struct xdp_frame *veth_ptr_to_xdp(void *ptr) |
9fc8d518 TM |
278 | { |
279 | return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG); | |
280 | } | |
281 | ||
defcffeb | 282 | static void *veth_xdp_to_ptr(struct xdp_frame *xdp) |
af87a3aa | 283 | { |
defcffeb | 284 | return (void *)((unsigned long)xdp | VETH_XDP_FLAG); |
af87a3aa TM |
285 | } |
286 | ||
9fc8d518 TM |
287 | static void veth_ptr_free(void *ptr) |
288 | { | |
289 | if (veth_is_xdp_frame(ptr)) | |
290 | xdp_return_frame(veth_ptr_to_xdp(ptr)); | |
291 | else | |
292 | kfree_skb(ptr); | |
293 | } | |
294 | ||
638264dc | 295 | static void __veth_xdp_flush(struct veth_rq *rq) |
948d4f21 TM |
296 | { |
297 | /* Write ptr_ring before reading rx_notify_masked */ | |
298 | smp_mb(); | |
68468d8c ED |
299 | if (!READ_ONCE(rq->rx_notify_masked) && |
300 | napi_schedule_prep(&rq->xdp_napi)) { | |
301 | WRITE_ONCE(rq->rx_notify_masked, true); | |
302 | __napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
303 | } |
304 | } | |
305 | ||
638264dc | 306 | static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb) |
948d4f21 | 307 | { |
638264dc | 308 | if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) { |
948d4f21 TM |
309 | dev_kfree_skb_any(skb); |
310 | return NET_RX_DROP; | |
311 | } | |
312 | ||
313 | return NET_RX_SUCCESS; | |
314 | } | |
315 | ||
638264dc TM |
316 | static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, |
317 | struct veth_rq *rq, bool xdp) | |
e314dbdc | 318 | { |
948d4f21 | 319 | return __dev_forward_skb(dev, skb) ?: xdp ? |
638264dc | 320 | veth_xdp_rx(rq, skb) : |
baebdf48 | 321 | __netif_rx(skb); |
948d4f21 TM |
322 | } |
323 | ||
47e550e0 PA |
324 | /* return true if the specified skb has chances of GRO aggregation |
325 | * Don't strive for accuracy, but try to avoid GRO overhead in the most | |
326 | * common scenarios. | |
327 | * When XDP is enabled, all traffic is considered eligible, as the xmit | |
328 | * device has TSO off. | |
329 | * When TSO is enabled on the xmit device, we are likely interested only | |
330 | * in UDP aggregation, explicitly check for that if the skb is suspected | |
331 | * - the sock_wfree destructor is used by UDP, ICMP and XDP sockets - | |
332 | * to belong to locally generated UDP traffic. | |
333 | */ | |
334 | static bool veth_skb_is_eligible_for_gro(const struct net_device *dev, | |
335 | const struct net_device *rcv, | |
336 | const struct sk_buff *skb) | |
337 | { | |
338 | return !(dev->features & NETIF_F_ALL_TSO) || | |
339 | (skb->destructor == sock_wfree && | |
340 | rcv->features & (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP_FWD)); | |
341 | } | |
342 | ||
948d4f21 TM |
343 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
344 | { | |
345 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
638264dc | 346 | struct veth_rq *rq = NULL; |
151e887d | 347 | int ret = NETDEV_TX_OK; |
d0e2c55e | 348 | struct net_device *rcv; |
2681128f | 349 | int length = skb->len; |
d3256efd | 350 | bool use_napi = false; |
638264dc | 351 | int rxq; |
e314dbdc | 352 | |
d0e2c55e ED |
353 | rcu_read_lock(); |
354 | rcv = rcu_dereference(priv->peer); | |
726e2c59 | 355 | if (unlikely(!rcv) || !pskb_may_pull(skb, ETH_HLEN)) { |
d0e2c55e ED |
356 | kfree_skb(skb); |
357 | goto drop; | |
358 | } | |
e314dbdc | 359 | |
948d4f21 | 360 | rcv_priv = netdev_priv(rcv); |
638264dc TM |
361 | rxq = skb_get_queue_mapping(skb); |
362 | if (rxq < rcv->real_num_rx_queues) { | |
363 | rq = &rcv_priv->rq[rxq]; | |
d3256efd PA |
364 | |
365 | /* The napi pointer is available when an XDP program is | |
366 | * attached or when GRO is enabled | |
47e550e0 | 367 | * Don't bother with napi/GRO if the skb can't be aggregated |
d3256efd | 368 | */ |
47e550e0 PA |
369 | use_napi = rcu_access_pointer(rq->napi) && |
370 | veth_skb_is_eligible_for_gro(dev, rcv, skb); | |
638264dc | 371 | } |
948d4f21 | 372 | |
aa4e689e | 373 | skb_tx_timestamp(skb); |
d3256efd PA |
374 | if (likely(veth_forward_skb(rcv, skb, rq, use_napi) == NET_RX_SUCCESS)) { |
375 | if (!use_napi) | |
b4fba476 | 376 | dev_lstats_add(dev, length); |
215eb9f9 LC |
377 | else |
378 | __veth_xdp_flush(rq); | |
2681128f | 379 | } else { |
d0e2c55e | 380 | drop: |
2681128f | 381 | atomic64_inc(&priv->dropped); |
151e887d | 382 | ret = NET_XMIT_DROP; |
2681128f | 383 | } |
948d4f21 | 384 | |
d0e2c55e | 385 | rcu_read_unlock(); |
948d4f21 | 386 | |
151e887d | 387 | return ret; |
e314dbdc PE |
388 | } |
389 | ||
b4fba476 | 390 | static u64 veth_stats_tx(struct net_device *dev, u64 *packets, u64 *bytes) |
e314dbdc | 391 | { |
cf05c700 | 392 | struct veth_priv *priv = netdev_priv(dev); |
cf05c700 | 393 | |
b4fba476 | 394 | dev_lstats_read(dev, packets, bytes); |
2681128f ED |
395 | return atomic64_read(&priv->dropped); |
396 | } | |
397 | ||
65780c56 | 398 | static void veth_stats_rx(struct veth_stats *result, struct net_device *dev) |
4195e54a TM |
399 | { |
400 | struct veth_priv *priv = netdev_priv(dev); | |
401 | int i; | |
402 | ||
5fe6e567 | 403 | result->peer_tq_xdp_xmit_err = 0; |
4195e54a | 404 | result->xdp_packets = 0; |
d99a7c2f | 405 | result->xdp_tx_err = 0; |
4195e54a | 406 | result->xdp_bytes = 0; |
66fe4a07 | 407 | result->rx_drops = 0; |
4195e54a | 408 | for (i = 0; i < dev->num_rx_queues; i++) { |
5fe6e567 | 409 | u64 packets, bytes, drops, xdp_tx_err, peer_tq_xdp_xmit_err; |
4195e54a | 410 | struct veth_rq_stats *stats = &priv->rq[i].stats; |
4195e54a TM |
411 | unsigned int start; |
412 | ||
413 | do { | |
068c38ad | 414 | start = u64_stats_fetch_begin(&stats->syncp); |
5fe6e567 | 415 | peer_tq_xdp_xmit_err = stats->vs.peer_tq_xdp_xmit_err; |
d99a7c2f | 416 | xdp_tx_err = stats->vs.xdp_tx_err; |
65780c56 LB |
417 | packets = stats->vs.xdp_packets; |
418 | bytes = stats->vs.xdp_bytes; | |
66fe4a07 | 419 | drops = stats->vs.rx_drops; |
068c38ad | 420 | } while (u64_stats_fetch_retry(&stats->syncp, start)); |
5fe6e567 | 421 | result->peer_tq_xdp_xmit_err += peer_tq_xdp_xmit_err; |
d99a7c2f | 422 | result->xdp_tx_err += xdp_tx_err; |
4195e54a TM |
423 | result->xdp_packets += packets; |
424 | result->xdp_bytes += bytes; | |
66fe4a07 | 425 | result->rx_drops += drops; |
4195e54a TM |
426 | } |
427 | } | |
428 | ||
bc1f4470 | 429 | static void veth_get_stats64(struct net_device *dev, |
430 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
431 | { |
432 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 433 | struct net_device *peer; |
65780c56 | 434 | struct veth_stats rx; |
b4fba476 | 435 | u64 packets, bytes; |
4195e54a | 436 | |
b4fba476 ED |
437 | tot->tx_dropped = veth_stats_tx(dev, &packets, &bytes); |
438 | tot->tx_bytes = bytes; | |
439 | tot->tx_packets = packets; | |
2681128f | 440 | |
4195e54a | 441 | veth_stats_rx(&rx, dev); |
5fe6e567 LB |
442 | tot->tx_dropped += rx.xdp_tx_err; |
443 | tot->rx_dropped = rx.rx_drops + rx.peer_tq_xdp_xmit_err; | |
4195e54a TM |
444 | tot->rx_bytes = rx.xdp_bytes; |
445 | tot->rx_packets = rx.xdp_packets; | |
2681128f | 446 | |
d0e2c55e ED |
447 | rcu_read_lock(); |
448 | peer = rcu_dereference(priv->peer); | |
449 | if (peer) { | |
e25d5dbc | 450 | veth_stats_tx(peer, &packets, &bytes); |
b4fba476 ED |
451 | tot->rx_bytes += bytes; |
452 | tot->rx_packets += packets; | |
4195e54a TM |
453 | |
454 | veth_stats_rx(&rx, peer); | |
5fe6e567 LB |
455 | tot->tx_dropped += rx.peer_tq_xdp_xmit_err; |
456 | tot->rx_dropped += rx.xdp_tx_err; | |
4195e54a TM |
457 | tot->tx_bytes += rx.xdp_bytes; |
458 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
459 | } |
460 | rcu_read_unlock(); | |
e314dbdc PE |
461 | } |
462 | ||
5c70ef85 G |
463 | /* fake multicast ability */ |
464 | static void veth_set_multicast_list(struct net_device *dev) | |
465 | { | |
466 | } | |
467 | ||
638264dc TM |
468 | static int veth_select_rxq(struct net_device *dev) |
469 | { | |
470 | return smp_processor_id() % dev->real_num_rx_queues; | |
471 | } | |
472 | ||
9aa1206e DB |
473 | static struct net_device *veth_peer_dev(struct net_device *dev) |
474 | { | |
475 | struct veth_priv *priv = netdev_priv(dev); | |
476 | ||
477 | /* Callers must be under RCU read side. */ | |
478 | return rcu_dereference(priv->peer); | |
479 | } | |
480 | ||
af87a3aa | 481 | static int veth_xdp_xmit(struct net_device *dev, int n, |
9152cff0 LB |
482 | struct xdp_frame **frames, |
483 | u32 flags, bool ndo_xmit) | |
af87a3aa TM |
484 | { |
485 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
fdc13979 | 486 | int i, ret = -ENXIO, nxmit = 0; |
af87a3aa | 487 | struct net_device *rcv; |
5fe6e567 | 488 | unsigned int max_len; |
638264dc | 489 | struct veth_rq *rq; |
af87a3aa | 490 | |
5fe6e567 | 491 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
d99a7c2f | 492 | return -EINVAL; |
af87a3aa | 493 | |
5fe6e567 | 494 | rcu_read_lock(); |
af87a3aa | 495 | rcv = rcu_dereference(priv->peer); |
5fe6e567 LB |
496 | if (unlikely(!rcv)) |
497 | goto out; | |
af87a3aa TM |
498 | |
499 | rcv_priv = netdev_priv(rcv); | |
5fe6e567 | 500 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
0e672f30 THJ |
501 | /* The napi pointer is set if NAPI is enabled, which ensures that |
502 | * xdp_ring is initialized on receive side and the peer device is up. | |
af87a3aa | 503 | */ |
0e672f30 | 504 | if (!rcu_access_pointer(rq->napi)) |
5fe6e567 | 505 | goto out; |
af87a3aa TM |
506 | |
507 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; | |
508 | ||
638264dc | 509 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
510 | for (i = 0; i < n; i++) { |
511 | struct xdp_frame *frame = frames[i]; | |
512 | void *ptr = veth_xdp_to_ptr(frame); | |
513 | ||
5142239a | 514 | if (unlikely(xdp_get_frame_len(frame) > max_len || |
fdc13979 LB |
515 | __ptr_ring_produce(&rq->xdp_ring, ptr))) |
516 | break; | |
517 | nxmit++; | |
af87a3aa | 518 | } |
638264dc | 519 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
520 | |
521 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 522 | __veth_xdp_flush(rq); |
af87a3aa | 523 | |
fdc13979 | 524 | ret = nxmit; |
9152cff0 | 525 | if (ndo_xmit) { |
5fe6e567 | 526 | u64_stats_update_begin(&rq->stats.syncp); |
fdc13979 LB |
527 | rq->stats.vs.peer_tq_xdp_xmit += nxmit; |
528 | rq->stats.vs.peer_tq_xdp_xmit_err += n - nxmit; | |
5fe6e567 | 529 | u64_stats_update_end(&rq->stats.syncp); |
9152cff0 | 530 | } |
9152cff0 | 531 | |
5fe6e567 | 532 | out: |
b23bfa56 | 533 | rcu_read_unlock(); |
2131479d TM |
534 | |
535 | return ret; | |
af87a3aa TM |
536 | } |
537 | ||
9152cff0 LB |
538 | static int veth_ndo_xdp_xmit(struct net_device *dev, int n, |
539 | struct xdp_frame **frames, u32 flags) | |
540 | { | |
5fe6e567 LB |
541 | int err; |
542 | ||
543 | err = veth_xdp_xmit(dev, n, frames, flags, true); | |
544 | if (err < 0) { | |
545 | struct veth_priv *priv = netdev_priv(dev); | |
546 | ||
547 | atomic64_add(n, &priv->dropped); | |
548 | } | |
549 | ||
550 | return err; | |
9152cff0 LB |
551 | } |
552 | ||
bd32aa1f | 553 | static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
9cda7807 | 554 | { |
fdc13979 | 555 | int sent, i, err = 0, drops; |
9cda7807 | 556 | |
bd32aa1f | 557 | sent = veth_xdp_xmit(rq->dev, bq->count, bq->q, 0, false); |
9cda7807 TM |
558 | if (sent < 0) { |
559 | err = sent; | |
560 | sent = 0; | |
9cda7807 | 561 | } |
fdc13979 LB |
562 | |
563 | for (i = sent; unlikely(i < bq->count); i++) | |
564 | xdp_return_frame(bq->q[i]); | |
565 | ||
566 | drops = bq->count - sent; | |
567 | trace_xdp_bulk_tx(rq->dev, sent, drops, err); | |
9cda7807 | 568 | |
5fe6e567 LB |
569 | u64_stats_update_begin(&rq->stats.syncp); |
570 | rq->stats.vs.xdp_tx += sent; | |
fdc13979 | 571 | rq->stats.vs.xdp_tx_err += drops; |
5fe6e567 LB |
572 | u64_stats_update_end(&rq->stats.syncp); |
573 | ||
9cda7807 TM |
574 | bq->count = 0; |
575 | } | |
576 | ||
bd32aa1f | 577 | static void veth_xdp_flush(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
d1396004 | 578 | { |
bd32aa1f | 579 | struct veth_priv *rcv_priv, *priv = netdev_priv(rq->dev); |
d1396004 | 580 | struct net_device *rcv; |
bd32aa1f | 581 | struct veth_rq *rcv_rq; |
d1396004 TM |
582 | |
583 | rcu_read_lock(); | |
bd32aa1f | 584 | veth_xdp_flush_bq(rq, bq); |
d1396004 TM |
585 | rcv = rcu_dereference(priv->peer); |
586 | if (unlikely(!rcv)) | |
587 | goto out; | |
588 | ||
589 | rcv_priv = netdev_priv(rcv); | |
bd32aa1f | 590 | rcv_rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 591 | /* xdp_ring is initialized on receive side? */ |
bd32aa1f | 592 | if (unlikely(!rcu_access_pointer(rcv_rq->xdp_prog))) |
d1396004 TM |
593 | goto out; |
594 | ||
bd32aa1f | 595 | __veth_xdp_flush(rcv_rq); |
d1396004 TM |
596 | out: |
597 | rcu_read_unlock(); | |
598 | } | |
599 | ||
bd32aa1f | 600 | static int veth_xdp_tx(struct veth_rq *rq, struct xdp_buff *xdp, |
9cda7807 | 601 | struct veth_xdp_tx_bq *bq) |
d1396004 | 602 | { |
1b698fa5 | 603 | struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp); |
d1396004 TM |
604 | |
605 | if (unlikely(!frame)) | |
606 | return -EOVERFLOW; | |
607 | ||
9cda7807 | 608 | if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE)) |
bd32aa1f | 609 | veth_xdp_flush_bq(rq, bq); |
9cda7807 TM |
610 | |
611 | bq->q[bq->count++] = frame; | |
612 | ||
613 | return 0; | |
d1396004 TM |
614 | } |
615 | ||
65e6dcf7 LB |
616 | static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq, |
617 | struct xdp_frame *frame, | |
618 | struct veth_xdp_tx_bq *bq, | |
619 | struct veth_stats *stats) | |
9fc8d518 | 620 | { |
d1396004 | 621 | struct xdp_frame orig_frame; |
9fc8d518 | 622 | struct bpf_prog *xdp_prog; |
9fc8d518 TM |
623 | |
624 | rcu_read_lock(); | |
638264dc | 625 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 | 626 | if (likely(xdp_prog)) { |
fefb695a SF |
627 | struct veth_xdp_buff vxbuf; |
628 | struct xdp_buff *xdp = &vxbuf.xdp; | |
9fc8d518 TM |
629 | u32 act; |
630 | ||
fefb695a SF |
631 | xdp_convert_frame_to_buff(frame, xdp); |
632 | xdp->rxq = &rq->xdp_rxq; | |
306531f0 | 633 | vxbuf.skb = NULL; |
9fc8d518 | 634 | |
fefb695a | 635 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
9fc8d518 TM |
636 | |
637 | switch (act) { | |
638 | case XDP_PASS: | |
fefb695a | 639 | if (xdp_update_frame_from_buff(xdp, frame)) |
89f479f0 | 640 | goto err_xdp; |
9fc8d518 | 641 | break; |
d1396004 TM |
642 | case XDP_TX: |
643 | orig_frame = *frame; | |
fefb695a SF |
644 | xdp->rxq->mem = frame->mem; |
645 | if (unlikely(veth_xdp_tx(rq, xdp, bq) < 0)) { | |
638264dc | 646 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 | 647 | frame = &orig_frame; |
1c5b82e5 | 648 | stats->rx_drops++; |
d1396004 TM |
649 | goto err_xdp; |
650 | } | |
1c5b82e5 | 651 | stats->xdp_tx++; |
d1396004 TM |
652 | rcu_read_unlock(); |
653 | goto xdp_xmit; | |
654 | case XDP_REDIRECT: | |
655 | orig_frame = *frame; | |
fefb695a SF |
656 | xdp->rxq->mem = frame->mem; |
657 | if (xdp_do_redirect(rq->dev, xdp, xdp_prog)) { | |
d1396004 | 658 | frame = &orig_frame; |
1c5b82e5 | 659 | stats->rx_drops++; |
d1396004 TM |
660 | goto err_xdp; |
661 | } | |
1c5b82e5 | 662 | stats->xdp_redirect++; |
d1396004 TM |
663 | rcu_read_unlock(); |
664 | goto xdp_xmit; | |
9fc8d518 | 665 | default: |
c8064e5b | 666 | bpf_warn_invalid_xdp_action(rq->dev, xdp_prog, act); |
df561f66 | 667 | fallthrough; |
9fc8d518 | 668 | case XDP_ABORTED: |
638264dc | 669 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 670 | fallthrough; |
9fc8d518 | 671 | case XDP_DROP: |
1c5b82e5 | 672 | stats->xdp_drops++; |
9fc8d518 TM |
673 | goto err_xdp; |
674 | } | |
675 | } | |
676 | rcu_read_unlock(); | |
677 | ||
65e6dcf7 | 678 | return frame; |
9fc8d518 TM |
679 | err_xdp: |
680 | rcu_read_unlock(); | |
681 | xdp_return_frame(frame); | |
d1396004 | 682 | xdp_xmit: |
9fc8d518 TM |
683 | return NULL; |
684 | } | |
685 | ||
65e6dcf7 LB |
686 | /* frames array contains VETH_XDP_BATCH at most */ |
687 | static void veth_xdp_rcv_bulk_skb(struct veth_rq *rq, void **frames, | |
688 | int n_xdpf, struct veth_xdp_tx_bq *bq, | |
689 | struct veth_stats *stats) | |
690 | { | |
691 | void *skbs[VETH_XDP_BATCH]; | |
692 | int i; | |
693 | ||
694 | if (xdp_alloc_skb_bulk(skbs, n_xdpf, | |
695 | GFP_ATOMIC | __GFP_ZERO) < 0) { | |
696 | for (i = 0; i < n_xdpf; i++) | |
697 | xdp_return_frame(frames[i]); | |
698 | stats->rx_drops += n_xdpf; | |
699 | ||
700 | return; | |
701 | } | |
702 | ||
703 | for (i = 0; i < n_xdpf; i++) { | |
704 | struct sk_buff *skb = skbs[i]; | |
705 | ||
706 | skb = __xdp_build_skb_from_frame(frames[i], skb, | |
707 | rq->dev); | |
708 | if (!skb) { | |
709 | xdp_return_frame(frames[i]); | |
710 | stats->rx_drops++; | |
711 | continue; | |
712 | } | |
713 | napi_gro_receive(&rq->xdp_napi, skb); | |
714 | } | |
715 | } | |
716 | ||
718a18a0 | 717 | static void veth_xdp_get(struct xdp_buff *xdp) |
948d4f21 | 718 | { |
718a18a0 LB |
719 | struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); |
720 | int i; | |
948d4f21 | 721 | |
718a18a0 LB |
722 | get_page(virt_to_page(xdp->data)); |
723 | if (likely(!xdp_buff_has_frags(xdp))) | |
724 | return; | |
4bf9ffa0 | 725 | |
718a18a0 LB |
726 | for (i = 0; i < sinfo->nr_frags; i++) |
727 | __skb_frag_ref(&sinfo->frags[i]); | |
728 | } | |
948d4f21 | 729 | |
718a18a0 LB |
730 | static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq, |
731 | struct xdp_buff *xdp, | |
732 | struct sk_buff **pskb) | |
733 | { | |
734 | struct sk_buff *skb = *pskb; | |
735 | u32 frame_sz; | |
948d4f21 TM |
736 | |
737 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
7c101318 SB |
738 | skb_shinfo(skb)->nr_frags || |
739 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { | |
718a18a0 | 740 | u32 size, len, max_head_size, off; |
948d4f21 | 741 | struct sk_buff *nskb; |
948d4f21 | 742 | struct page *page; |
718a18a0 | 743 | int i, head_off; |
948d4f21 | 744 | |
718a18a0 LB |
745 | /* We need a private copy of the skb and data buffers since |
746 | * the ebpf program can modify it. We segment the original skb | |
747 | * into order-0 pages without linearize it. | |
748 | * | |
749 | * Make sure we have enough space for linear and paged area | |
750 | */ | |
751 | max_head_size = SKB_WITH_OVERHEAD(PAGE_SIZE - | |
752 | VETH_XDP_HEADROOM); | |
753 | if (skb->len > PAGE_SIZE * MAX_SKB_FRAGS + max_head_size) | |
948d4f21 TM |
754 | goto drop; |
755 | ||
718a18a0 | 756 | /* Allocate skb head */ |
0ebab78c | 757 | page = page_pool_dev_alloc_pages(rq->page_pool); |
948d4f21 TM |
758 | if (!page) |
759 | goto drop; | |
760 | ||
9d142ed4 | 761 | nskb = napi_build_skb(page_address(page), PAGE_SIZE); |
718a18a0 | 762 | if (!nskb) { |
0ebab78c | 763 | page_pool_put_full_page(rq->page_pool, page, true); |
948d4f21 TM |
764 | goto drop; |
765 | } | |
766 | ||
718a18a0 | 767 | skb_reserve(nskb, VETH_XDP_HEADROOM); |
0ebab78c LB |
768 | skb_copy_header(nskb, skb); |
769 | skb_mark_for_recycle(nskb); | |
770 | ||
718a18a0 LB |
771 | size = min_t(u32, skb->len, max_head_size); |
772 | if (skb_copy_bits(skb, 0, nskb->data, size)) { | |
773 | consume_skb(nskb); | |
948d4f21 TM |
774 | goto drop; |
775 | } | |
718a18a0 | 776 | skb_put(nskb, size); |
948d4f21 | 777 | |
948d4f21 TM |
778 | head_off = skb_headroom(nskb) - skb_headroom(skb); |
779 | skb_headers_offset_update(nskb, head_off); | |
718a18a0 LB |
780 | |
781 | /* Allocate paged area of new skb */ | |
782 | off = size; | |
783 | len = skb->len - off; | |
784 | ||
785 | for (i = 0; i < MAX_SKB_FRAGS && off < skb->len; i++) { | |
0ebab78c | 786 | page = page_pool_dev_alloc_pages(rq->page_pool); |
718a18a0 LB |
787 | if (!page) { |
788 | consume_skb(nskb); | |
789 | goto drop; | |
790 | } | |
791 | ||
792 | size = min_t(u32, len, PAGE_SIZE); | |
793 | skb_add_rx_frag(nskb, i, page, 0, size, PAGE_SIZE); | |
794 | if (skb_copy_bits(skb, off, page_address(page), | |
795 | size)) { | |
796 | consume_skb(nskb); | |
797 | goto drop; | |
798 | } | |
799 | ||
800 | len -= size; | |
801 | off += size; | |
802 | } | |
803 | ||
948d4f21 TM |
804 | consume_skb(skb); |
805 | skb = nskb; | |
806 | } | |
807 | ||
45a9e6d8 | 808 | /* SKB "head" area always have tailroom for skb_shared_info */ |
be9df4af | 809 | frame_sz = skb_end_pointer(skb) - skb->head; |
43b5169d | 810 | frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
718a18a0 LB |
811 | xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); |
812 | xdp_prepare_buff(xdp, skb->head, skb_headroom(skb), | |
813 | skb_headlen(skb), true); | |
814 | ||
815 | if (skb_is_nonlinear(skb)) { | |
816 | skb_shinfo(skb)->xdp_frags_size = skb->data_len; | |
817 | xdp_buff_set_frags_flag(xdp); | |
818 | } else { | |
819 | xdp_buff_clear_frags_flag(xdp); | |
820 | } | |
821 | *pskb = skb; | |
822 | ||
823 | return 0; | |
824 | drop: | |
825 | consume_skb(skb); | |
826 | *pskb = NULL; | |
827 | ||
828 | return -ENOMEM; | |
829 | } | |
830 | ||
831 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, | |
832 | struct sk_buff *skb, | |
833 | struct veth_xdp_tx_bq *bq, | |
834 | struct veth_stats *stats) | |
835 | { | |
836 | void *orig_data, *orig_data_end; | |
837 | struct bpf_prog *xdp_prog; | |
fefb695a SF |
838 | struct veth_xdp_buff vxbuf; |
839 | struct xdp_buff *xdp = &vxbuf.xdp; | |
718a18a0 LB |
840 | u32 act, metalen; |
841 | int off; | |
842 | ||
843 | skb_prepare_for_gro(skb); | |
844 | ||
845 | rcu_read_lock(); | |
846 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
847 | if (unlikely(!xdp_prog)) { | |
848 | rcu_read_unlock(); | |
849 | goto out; | |
850 | } | |
851 | ||
852 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
fefb695a | 853 | if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb)) |
718a18a0 | 854 | goto drop; |
306531f0 | 855 | vxbuf.skb = skb; |
45a9e6d8 | 856 | |
fefb695a SF |
857 | orig_data = xdp->data; |
858 | orig_data_end = xdp->data_end; | |
948d4f21 | 859 | |
fefb695a | 860 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
948d4f21 TM |
861 | |
862 | switch (act) { | |
863 | case XDP_PASS: | |
864 | break; | |
d1396004 | 865 | case XDP_TX: |
fefb695a | 866 | veth_xdp_get(xdp); |
d1396004 | 867 | consume_skb(skb); |
fefb695a SF |
868 | xdp->rxq->mem = rq->xdp_mem; |
869 | if (unlikely(veth_xdp_tx(rq, xdp, bq) < 0)) { | |
638264dc | 870 | trace_xdp_exception(rq->dev, xdp_prog, act); |
1c5b82e5 | 871 | stats->rx_drops++; |
d1396004 TM |
872 | goto err_xdp; |
873 | } | |
1c5b82e5 | 874 | stats->xdp_tx++; |
d1396004 TM |
875 | rcu_read_unlock(); |
876 | goto xdp_xmit; | |
877 | case XDP_REDIRECT: | |
fefb695a | 878 | veth_xdp_get(xdp); |
d1396004 | 879 | consume_skb(skb); |
fefb695a SF |
880 | xdp->rxq->mem = rq->xdp_mem; |
881 | if (xdp_do_redirect(rq->dev, xdp, xdp_prog)) { | |
1c5b82e5 | 882 | stats->rx_drops++; |
d1396004 | 883 | goto err_xdp; |
1c5b82e5 LB |
884 | } |
885 | stats->xdp_redirect++; | |
d1396004 TM |
886 | rcu_read_unlock(); |
887 | goto xdp_xmit; | |
948d4f21 | 888 | default: |
c8064e5b | 889 | bpf_warn_invalid_xdp_action(rq->dev, xdp_prog, act); |
df561f66 | 890 | fallthrough; |
948d4f21 | 891 | case XDP_ABORTED: |
638264dc | 892 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 893 | fallthrough; |
948d4f21 | 894 | case XDP_DROP: |
1c5b82e5 LB |
895 | stats->xdp_drops++; |
896 | goto xdp_drop; | |
948d4f21 TM |
897 | } |
898 | rcu_read_unlock(); | |
899 | ||
45a9e6d8 | 900 | /* check if bpf_xdp_adjust_head was used */ |
fefb695a | 901 | off = orig_data - xdp->data; |
948d4f21 TM |
902 | if (off > 0) |
903 | __skb_push(skb, off); | |
904 | else if (off < 0) | |
905 | __skb_pull(skb, -off); | |
718a18a0 LB |
906 | |
907 | skb_reset_mac_header(skb); | |
45a9e6d8 JDB |
908 | |
909 | /* check if bpf_xdp_adjust_tail was used */ | |
fefb695a | 910 | off = xdp->data_end - orig_data_end; |
948d4f21 | 911 | if (off != 0) |
45a9e6d8 | 912 | __skb_put(skb, off); /* positive on grow, negative on shrink */ |
718a18a0 LB |
913 | |
914 | /* XDP frag metadata (e.g. nr_frags) are updated in eBPF helpers | |
915 | * (e.g. bpf_xdp_adjust_tail), we need to update data_len here. | |
916 | */ | |
fefb695a | 917 | if (xdp_buff_has_frags(xdp)) |
718a18a0 LB |
918 | skb->data_len = skb_shinfo(skb)->xdp_frags_size; |
919 | else | |
920 | skb->data_len = 0; | |
921 | ||
638264dc | 922 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 | 923 | |
fefb695a | 924 | metalen = xdp->data - xdp->data_meta; |
948d4f21 TM |
925 | if (metalen) |
926 | skb_metadata_set(skb, metalen); | |
927 | out: | |
928 | return skb; | |
929 | drop: | |
1c5b82e5 LB |
930 | stats->rx_drops++; |
931 | xdp_drop: | |
948d4f21 TM |
932 | rcu_read_unlock(); |
933 | kfree_skb(skb); | |
934 | return NULL; | |
d1396004 TM |
935 | err_xdp: |
936 | rcu_read_unlock(); | |
fefb695a | 937 | xdp_return_buff(xdp); |
d1396004 TM |
938 | xdp_xmit: |
939 | return NULL; | |
948d4f21 TM |
940 | } |
941 | ||
1c5b82e5 LB |
942 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, |
943 | struct veth_xdp_tx_bq *bq, | |
944 | struct veth_stats *stats) | |
948d4f21 | 945 | { |
65e6dcf7 LB |
946 | int i, done = 0, n_xdpf = 0; |
947 | void *xdpf[VETH_XDP_BATCH]; | |
948d4f21 TM |
948 | |
949 | for (i = 0; i < budget; i++) { | |
638264dc | 950 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
948d4f21 | 951 | |
9fc8d518 | 952 | if (!ptr) |
948d4f21 TM |
953 | break; |
954 | ||
d1396004 | 955 | if (veth_is_xdp_frame(ptr)) { |
65e6dcf7 | 956 | /* ndo_xdp_xmit */ |
4195e54a TM |
957 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
958 | ||
5142239a | 959 | stats->xdp_bytes += xdp_get_frame_len(frame); |
65e6dcf7 LB |
960 | frame = veth_xdp_rcv_one(rq, frame, bq, stats); |
961 | if (frame) { | |
962 | /* XDP_PASS */ | |
963 | xdpf[n_xdpf++] = frame; | |
964 | if (n_xdpf == VETH_XDP_BATCH) { | |
965 | veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, | |
966 | bq, stats); | |
967 | n_xdpf = 0; | |
968 | } | |
969 | } | |
d1396004 | 970 | } else { |
65e6dcf7 LB |
971 | /* ndo_start_xmit */ |
972 | struct sk_buff *skb = ptr; | |
973 | ||
1c5b82e5 LB |
974 | stats->xdp_bytes += skb->len; |
975 | skb = veth_xdp_rcv_skb(rq, skb, bq, stats); | |
9695b7de PA |
976 | if (skb) { |
977 | if (skb_shared(skb) || skb_unclone(skb, GFP_ATOMIC)) | |
978 | netif_receive_skb(skb); | |
979 | else | |
980 | napi_gro_receive(&rq->xdp_napi, skb); | |
981 | } | |
d1396004 | 982 | } |
948d4f21 TM |
983 | done++; |
984 | } | |
985 | ||
65e6dcf7 LB |
986 | if (n_xdpf) |
987 | veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, bq, stats); | |
988 | ||
4195e54a | 989 | u64_stats_update_begin(&rq->stats.syncp); |
9152cff0 | 990 | rq->stats.vs.xdp_redirect += stats->xdp_redirect; |
1c5b82e5 | 991 | rq->stats.vs.xdp_bytes += stats->xdp_bytes; |
66fe4a07 LB |
992 | rq->stats.vs.xdp_drops += stats->xdp_drops; |
993 | rq->stats.vs.rx_drops += stats->rx_drops; | |
65780c56 | 994 | rq->stats.vs.xdp_packets += done; |
4195e54a TM |
995 | u64_stats_update_end(&rq->stats.syncp); |
996 | ||
948d4f21 TM |
997 | return done; |
998 | } | |
999 | ||
1000 | static int veth_poll(struct napi_struct *napi, int budget) | |
1001 | { | |
638264dc TM |
1002 | struct veth_rq *rq = |
1003 | container_of(napi, struct veth_rq, xdp_napi); | |
1c5b82e5 | 1004 | struct veth_stats stats = {}; |
9cda7807 | 1005 | struct veth_xdp_tx_bq bq; |
948d4f21 TM |
1006 | int done; |
1007 | ||
9cda7807 TM |
1008 | bq.count = 0; |
1009 | ||
d1396004 | 1010 | xdp_set_return_frame_no_direct(); |
1c5b82e5 | 1011 | done = veth_xdp_rcv(rq, budget, &bq, &stats); |
948d4f21 | 1012 | |
fa349e39 SB |
1013 | if (stats.xdp_redirect > 0) |
1014 | xdp_do_flush(); | |
1015 | ||
948d4f21 TM |
1016 | if (done < budget && napi_complete_done(napi, done)) { |
1017 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
1018 | smp_store_mb(rq->rx_notify_masked, false); |
1019 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
68468d8c ED |
1020 | if (napi_schedule_prep(&rq->xdp_napi)) { |
1021 | WRITE_ONCE(rq->rx_notify_masked, true); | |
1022 | __napi_schedule(&rq->xdp_napi); | |
1023 | } | |
948d4f21 TM |
1024 | } |
1025 | } | |
1026 | ||
1c5b82e5 | 1027 | if (stats.xdp_tx > 0) |
bd32aa1f | 1028 | veth_xdp_flush(rq, &bq); |
d1396004 TM |
1029 | xdp_clear_return_frame_no_direct(); |
1030 | ||
948d4f21 TM |
1031 | return done; |
1032 | } | |
1033 | ||
0ebab78c LB |
1034 | static int veth_create_page_pool(struct veth_rq *rq) |
1035 | { | |
1036 | struct page_pool_params pp_params = { | |
1037 | .order = 0, | |
1038 | .pool_size = VETH_RING_SIZE, | |
1039 | .nid = NUMA_NO_NODE, | |
1040 | .dev = &rq->dev->dev, | |
1041 | }; | |
1042 | ||
1043 | rq->page_pool = page_pool_create(&pp_params); | |
1044 | if (IS_ERR(rq->page_pool)) { | |
1045 | int err = PTR_ERR(rq->page_pool); | |
1046 | ||
1047 | rq->page_pool = NULL; | |
1048 | return err; | |
1049 | } | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
dedd53c5 | 1054 | static int __veth_napi_enable_range(struct net_device *dev, int start, int end) |
948d4f21 TM |
1055 | { |
1056 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1057 | int err, i; |
948d4f21 | 1058 | |
0ebab78c LB |
1059 | for (i = start; i < end; i++) { |
1060 | err = veth_create_page_pool(&priv->rq[i]); | |
1061 | if (err) | |
1062 | goto err_page_pool; | |
1063 | } | |
1064 | ||
dedd53c5 | 1065 | for (i = start; i < end; i++) { |
638264dc TM |
1066 | struct veth_rq *rq = &priv->rq[i]; |
1067 | ||
1068 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
1069 | if (err) | |
1070 | goto err_xdp_ring; | |
1071 | } | |
948d4f21 | 1072 | |
dedd53c5 | 1073 | for (i = start; i < end; i++) { |
638264dc TM |
1074 | struct veth_rq *rq = &priv->rq[i]; |
1075 | ||
638264dc | 1076 | napi_enable(&rq->xdp_napi); |
d3256efd | 1077 | rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi); |
638264dc | 1078 | } |
948d4f21 TM |
1079 | |
1080 | return 0; | |
dedd53c5 | 1081 | |
638264dc | 1082 | err_xdp_ring: |
dedd53c5 | 1083 | for (i--; i >= start; i--) |
638264dc | 1084 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); |
8a519a57 | 1085 | i = end; |
0ebab78c | 1086 | err_page_pool: |
8a519a57 | 1087 | for (i--; i >= start; i--) { |
0ebab78c LB |
1088 | page_pool_destroy(priv->rq[i].page_pool); |
1089 | priv->rq[i].page_pool = NULL; | |
1090 | } | |
638264dc TM |
1091 | |
1092 | return err; | |
948d4f21 TM |
1093 | } |
1094 | ||
dedd53c5 PA |
1095 | static int __veth_napi_enable(struct net_device *dev) |
1096 | { | |
1097 | return __veth_napi_enable_range(dev, 0, dev->real_num_rx_queues); | |
1098 | } | |
1099 | ||
1100 | static void veth_napi_del_range(struct net_device *dev, int start, int end) | |
948d4f21 TM |
1101 | { |
1102 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1103 | int i; |
948d4f21 | 1104 | |
dedd53c5 | 1105 | for (i = start; i < end; i++) { |
638264dc TM |
1106 | struct veth_rq *rq = &priv->rq[i]; |
1107 | ||
d3256efd | 1108 | rcu_assign_pointer(priv->rq[i].napi, NULL); |
638264dc | 1109 | napi_disable(&rq->xdp_napi); |
5198d545 | 1110 | __netif_napi_del(&rq->xdp_napi); |
638264dc TM |
1111 | } |
1112 | synchronize_net(); | |
1113 | ||
dedd53c5 | 1114 | for (i = start; i < end; i++) { |
638264dc TM |
1115 | struct veth_rq *rq = &priv->rq[i]; |
1116 | ||
638264dc TM |
1117 | rq->rx_notify_masked = false; |
1118 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
1119 | } | |
0ebab78c LB |
1120 | |
1121 | for (i = start; i < end; i++) { | |
1122 | page_pool_destroy(priv->rq[i].page_pool); | |
1123 | priv->rq[i].page_pool = NULL; | |
1124 | } | |
948d4f21 TM |
1125 | } |
1126 | ||
dedd53c5 PA |
1127 | static void veth_napi_del(struct net_device *dev) |
1128 | { | |
1129 | veth_napi_del_range(dev, 0, dev->real_num_rx_queues); | |
1130 | } | |
1131 | ||
d3256efd PA |
1132 | static bool veth_gro_requested(const struct net_device *dev) |
1133 | { | |
1134 | return !!(dev->wanted_features & NETIF_F_GRO); | |
1135 | } | |
1136 | ||
dedd53c5 PA |
1137 | static int veth_enable_xdp_range(struct net_device *dev, int start, int end, |
1138 | bool napi_already_on) | |
948d4f21 TM |
1139 | { |
1140 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1141 | int err, i; |
948d4f21 | 1142 | |
dedd53c5 PA |
1143 | for (i = start; i < end; i++) { |
1144 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 1145 | |
dedd53c5 | 1146 | if (!napi_already_on) |
b48b89f9 | 1147 | netif_napi_add(dev, &rq->xdp_napi, veth_poll); |
dedd53c5 PA |
1148 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i, rq->xdp_napi.napi_id); |
1149 | if (err < 0) | |
1150 | goto err_rxq_reg; | |
1151 | ||
1152 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
1153 | MEM_TYPE_PAGE_SHARED, | |
1154 | NULL); | |
1155 | if (err < 0) | |
1156 | goto err_reg_mem; | |
1157 | ||
1158 | /* Save original mem info as it can be overwritten */ | |
1159 | rq->xdp_mem = rq->xdp_rxq.mem; | |
1160 | } | |
1161 | return 0; | |
638264dc | 1162 | |
dedd53c5 PA |
1163 | err_reg_mem: |
1164 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
1165 | err_rxq_reg: | |
1166 | for (i--; i >= start; i--) { | |
1167 | struct veth_rq *rq = &priv->rq[i]; | |
638264dc | 1168 | |
dedd53c5 PA |
1169 | xdp_rxq_info_unreg(&rq->xdp_rxq); |
1170 | if (!napi_already_on) | |
1171 | netif_napi_del(&rq->xdp_napi); | |
1172 | } | |
1173 | ||
1174 | return err; | |
1175 | } | |
1176 | ||
1177 | static void veth_disable_xdp_range(struct net_device *dev, int start, int end, | |
1178 | bool delete_napi) | |
1179 | { | |
1180 | struct veth_priv *priv = netdev_priv(dev); | |
1181 | int i; | |
1182 | ||
1183 | for (i = start; i < end; i++) { | |
1184 | struct veth_rq *rq = &priv->rq[i]; | |
1185 | ||
1186 | rq->xdp_rxq.mem = rq->xdp_mem; | |
1187 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
1188 | ||
1189 | if (delete_napi) | |
1190 | netif_napi_del(&rq->xdp_napi); | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | static int veth_enable_xdp(struct net_device *dev) | |
1195 | { | |
5e8d3dc7 | 1196 | bool napi_already_on = veth_gro_requested(dev) && (dev->flags & IFF_UP); |
dedd53c5 PA |
1197 | struct veth_priv *priv = netdev_priv(dev); |
1198 | int err, i; | |
1199 | ||
1200 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { | |
1201 | err = veth_enable_xdp_range(dev, 0, dev->real_num_rx_queues, napi_already_on); | |
1202 | if (err) | |
1203 | return err; | |
948d4f21 | 1204 | |
d3256efd PA |
1205 | if (!napi_already_on) { |
1206 | err = __veth_napi_enable(dev); | |
dedd53c5 PA |
1207 | if (err) { |
1208 | veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, true); | |
1209 | return err; | |
1210 | } | |
d3256efd PA |
1211 | |
1212 | if (!veth_gro_requested(dev)) { | |
1213 | /* user-space did not require GRO, but adding XDP | |
1214 | * is supposed to get GRO working | |
1215 | */ | |
1216 | dev->features |= NETIF_F_GRO; | |
1217 | netdev_features_change(dev); | |
1218 | } | |
1219 | } | |
948d4f21 TM |
1220 | } |
1221 | ||
d3256efd | 1222 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
638264dc | 1223 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); |
d3256efd PA |
1224 | rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi); |
1225 | } | |
948d4f21 TM |
1226 | |
1227 | return 0; | |
948d4f21 TM |
1228 | } |
1229 | ||
1230 | static void veth_disable_xdp(struct net_device *dev) | |
1231 | { | |
1232 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1233 | int i; |
948d4f21 | 1234 | |
638264dc TM |
1235 | for (i = 0; i < dev->real_num_rx_queues; i++) |
1236 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
d3256efd PA |
1237 | |
1238 | if (!netif_running(dev) || !veth_gro_requested(dev)) { | |
1239 | veth_napi_del(dev); | |
1240 | ||
1241 | /* if user-space did not require GRO, since adding XDP | |
1242 | * enabled it, clear it now | |
1243 | */ | |
1244 | if (!veth_gro_requested(dev) && netif_running(dev)) { | |
1245 | dev->features &= ~NETIF_F_GRO; | |
1246 | netdev_features_change(dev); | |
1247 | } | |
1248 | } | |
1249 | ||
dedd53c5 | 1250 | veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, false); |
948d4f21 TM |
1251 | } |
1252 | ||
dedd53c5 | 1253 | static int veth_napi_enable_range(struct net_device *dev, int start, int end) |
d3256efd PA |
1254 | { |
1255 | struct veth_priv *priv = netdev_priv(dev); | |
1256 | int err, i; | |
1257 | ||
dedd53c5 | 1258 | for (i = start; i < end; i++) { |
d3256efd PA |
1259 | struct veth_rq *rq = &priv->rq[i]; |
1260 | ||
b48b89f9 | 1261 | netif_napi_add(dev, &rq->xdp_napi, veth_poll); |
d3256efd PA |
1262 | } |
1263 | ||
dedd53c5 | 1264 | err = __veth_napi_enable_range(dev, start, end); |
d3256efd | 1265 | if (err) { |
dedd53c5 | 1266 | for (i = start; i < end; i++) { |
d3256efd PA |
1267 | struct veth_rq *rq = &priv->rq[i]; |
1268 | ||
1269 | netif_napi_del(&rq->xdp_napi); | |
1270 | } | |
1271 | return err; | |
1272 | } | |
1273 | return err; | |
1274 | } | |
1275 | ||
dedd53c5 PA |
1276 | static int veth_napi_enable(struct net_device *dev) |
1277 | { | |
1278 | return veth_napi_enable_range(dev, 0, dev->real_num_rx_queues); | |
1279 | } | |
1280 | ||
4752eeb3 PA |
1281 | static void veth_disable_range_safe(struct net_device *dev, int start, int end) |
1282 | { | |
1283 | struct veth_priv *priv = netdev_priv(dev); | |
1284 | ||
1285 | if (start >= end) | |
1286 | return; | |
1287 | ||
1288 | if (priv->_xdp_prog) { | |
1289 | veth_napi_del_range(dev, start, end); | |
1290 | veth_disable_xdp_range(dev, start, end, false); | |
1291 | } else if (veth_gro_requested(dev)) { | |
1292 | veth_napi_del_range(dev, start, end); | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | static int veth_enable_range_safe(struct net_device *dev, int start, int end) | |
1297 | { | |
1298 | struct veth_priv *priv = netdev_priv(dev); | |
1299 | int err; | |
1300 | ||
1301 | if (start >= end) | |
1302 | return 0; | |
1303 | ||
1304 | if (priv->_xdp_prog) { | |
1305 | /* these channels are freshly initialized, napi is not on there even | |
1306 | * when GRO is requeste | |
1307 | */ | |
1308 | err = veth_enable_xdp_range(dev, start, end, false); | |
1309 | if (err) | |
1310 | return err; | |
1311 | ||
1312 | err = __veth_napi_enable_range(dev, start, end); | |
1313 | if (err) { | |
1314 | /* on error always delete the newly added napis */ | |
1315 | veth_disable_xdp_range(dev, start, end, true); | |
1316 | return err; | |
1317 | } | |
1318 | } else if (veth_gro_requested(dev)) { | |
1319 | return veth_napi_enable_range(dev, start, end); | |
1320 | } | |
1321 | return 0; | |
1322 | } | |
1323 | ||
fccca038 LB |
1324 | static void veth_set_xdp_features(struct net_device *dev) |
1325 | { | |
1326 | struct veth_priv *priv = netdev_priv(dev); | |
1327 | struct net_device *peer; | |
1328 | ||
5ce76fe1 | 1329 | peer = rtnl_dereference(priv->peer); |
fccca038 | 1330 | if (peer && peer->real_num_tx_queues <= dev->real_num_rx_queues) { |
8267fc71 | 1331 | struct veth_priv *priv_peer = netdev_priv(peer); |
fccca038 LB |
1332 | xdp_features_t val = NETDEV_XDP_ACT_BASIC | |
1333 | NETDEV_XDP_ACT_REDIRECT | | |
1334 | NETDEV_XDP_ACT_RX_SG; | |
1335 | ||
8267fc71 | 1336 | if (priv_peer->_xdp_prog || veth_gro_requested(peer)) |
fccca038 LB |
1337 | val |= NETDEV_XDP_ACT_NDO_XMIT | |
1338 | NETDEV_XDP_ACT_NDO_XMIT_SG; | |
1339 | xdp_set_features_flag(dev, val); | |
1340 | } else { | |
1341 | xdp_clear_features_flag(dev); | |
1342 | } | |
1343 | } | |
1344 | ||
4752eeb3 PA |
1345 | static int veth_set_channels(struct net_device *dev, |
1346 | struct ethtool_channels *ch) | |
1347 | { | |
1348 | struct veth_priv *priv = netdev_priv(dev); | |
1349 | unsigned int old_rx_count, new_rx_count; | |
1350 | struct veth_priv *peer_priv; | |
1351 | struct net_device *peer; | |
1352 | int err; | |
1353 | ||
1354 | /* sanity check. Upper bounds are already enforced by the caller */ | |
1355 | if (!ch->rx_count || !ch->tx_count) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | /* avoid braking XDP, if that is enabled */ | |
1359 | peer = rtnl_dereference(priv->peer); | |
1360 | peer_priv = peer ? netdev_priv(peer) : NULL; | |
1361 | if (priv->_xdp_prog && peer && ch->rx_count < peer->real_num_tx_queues) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | if (peer && peer_priv && peer_priv->_xdp_prog && ch->tx_count > peer->real_num_rx_queues) | |
1365 | return -EINVAL; | |
1366 | ||
1367 | old_rx_count = dev->real_num_rx_queues; | |
1368 | new_rx_count = ch->rx_count; | |
1369 | if (netif_running(dev)) { | |
1370 | /* turn device off */ | |
1371 | netif_carrier_off(dev); | |
1372 | if (peer) | |
1373 | netif_carrier_off(peer); | |
1374 | ||
1375 | /* try to allocate new resurces, as needed*/ | |
1376 | err = veth_enable_range_safe(dev, old_rx_count, new_rx_count); | |
1377 | if (err) | |
1378 | goto out; | |
1379 | } | |
1380 | ||
1381 | err = netif_set_real_num_rx_queues(dev, ch->rx_count); | |
1382 | if (err) | |
1383 | goto revert; | |
1384 | ||
1385 | err = netif_set_real_num_tx_queues(dev, ch->tx_count); | |
1386 | if (err) { | |
1387 | int err2 = netif_set_real_num_rx_queues(dev, old_rx_count); | |
1388 | ||
1389 | /* this error condition could happen only if rx and tx change | |
1390 | * in opposite directions (e.g. tx nr raises, rx nr decreases) | |
1391 | * and we can't do anything to fully restore the original | |
1392 | * status | |
1393 | */ | |
1394 | if (err2) | |
1395 | pr_warn("Can't restore rx queues config %d -> %d %d", | |
1396 | new_rx_count, old_rx_count, err2); | |
1397 | else | |
1398 | goto revert; | |
1399 | } | |
1400 | ||
1401 | out: | |
1402 | if (netif_running(dev)) { | |
1403 | /* note that we need to swap the arguments WRT the enable part | |
1404 | * to identify the range we have to disable | |
1405 | */ | |
1406 | veth_disable_range_safe(dev, new_rx_count, old_rx_count); | |
1407 | netif_carrier_on(dev); | |
1408 | if (peer) | |
1409 | netif_carrier_on(peer); | |
1410 | } | |
fccca038 LB |
1411 | |
1412 | /* update XDP supported features */ | |
1413 | veth_set_xdp_features(dev); | |
1414 | if (peer) | |
1415 | veth_set_xdp_features(peer); | |
1416 | ||
4752eeb3 PA |
1417 | return err; |
1418 | ||
1419 | revert: | |
1420 | new_rx_count = old_rx_count; | |
1421 | old_rx_count = ch->rx_count; | |
1422 | goto out; | |
1423 | } | |
1424 | ||
e314dbdc PE |
1425 | static int veth_open(struct net_device *dev) |
1426 | { | |
5e8d3dc7 | 1427 | struct veth_priv *priv = netdev_priv(dev); |
d0e2c55e | 1428 | struct net_device *peer = rtnl_dereference(priv->peer); |
948d4f21 | 1429 | int err; |
e314dbdc | 1430 | |
d0e2c55e | 1431 | if (!peer) |
e314dbdc PE |
1432 | return -ENOTCONN; |
1433 | ||
948d4f21 TM |
1434 | if (priv->_xdp_prog) { |
1435 | err = veth_enable_xdp(dev); | |
1436 | if (err) | |
1437 | return err; | |
5e8d3dc7 | 1438 | } else if (veth_gro_requested(dev)) { |
d3256efd PA |
1439 | err = veth_napi_enable(dev); |
1440 | if (err) | |
1441 | return err; | |
948d4f21 TM |
1442 | } |
1443 | ||
d0e2c55e | 1444 | if (peer->flags & IFF_UP) { |
e314dbdc | 1445 | netif_carrier_on(dev); |
d0e2c55e | 1446 | netif_carrier_on(peer); |
e314dbdc | 1447 | } |
948d4f21 | 1448 | |
e314dbdc PE |
1449 | return 0; |
1450 | } | |
1451 | ||
2cf48a10 EB |
1452 | static int veth_close(struct net_device *dev) |
1453 | { | |
5e8d3dc7 | 1454 | struct veth_priv *priv = netdev_priv(dev); |
2efd32ee | 1455 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
1456 | |
1457 | netif_carrier_off(dev); | |
5e8d3dc7 HQ |
1458 | if (peer) |
1459 | netif_carrier_off(peer); | |
2cf48a10 | 1460 | |
5e8d3dc7 | 1461 | if (priv->_xdp_prog) |
948d4f21 | 1462 | veth_disable_xdp(dev); |
5e8d3dc7 | 1463 | else if (veth_gro_requested(dev)) |
d3256efd | 1464 | veth_napi_del(dev); |
948d4f21 | 1465 | |
2cf48a10 EB |
1466 | return 0; |
1467 | } | |
1468 | ||
91572088 | 1469 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 1470 | { |
91572088 | 1471 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
1472 | } |
1473 | ||
7797b93b TM |
1474 | static int veth_alloc_queues(struct net_device *dev) |
1475 | { | |
1476 | struct veth_priv *priv = netdev_priv(dev); | |
1477 | int i; | |
1478 | ||
961c6136 | 1479 | priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL_ACCOUNT); |
7797b93b TM |
1480 | if (!priv->rq) |
1481 | return -ENOMEM; | |
1482 | ||
4195e54a | 1483 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 1484 | priv->rq[i].dev = dev; |
4195e54a TM |
1485 | u64_stats_init(&priv->rq[i].stats.syncp); |
1486 | } | |
7797b93b TM |
1487 | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | static void veth_free_queues(struct net_device *dev) | |
1492 | { | |
1493 | struct veth_priv *priv = netdev_priv(dev); | |
1494 | ||
1495 | kfree(priv->rq); | |
1496 | } | |
1497 | ||
e314dbdc PE |
1498 | static int veth_dev_init(struct net_device *dev) |
1499 | { | |
7797b93b TM |
1500 | int err; |
1501 | ||
14d73416 LR |
1502 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
1503 | if (!dev->lstats) | |
e314dbdc | 1504 | return -ENOMEM; |
7797b93b TM |
1505 | |
1506 | err = veth_alloc_queues(dev); | |
1507 | if (err) { | |
14d73416 | 1508 | free_percpu(dev->lstats); |
7797b93b TM |
1509 | return err; |
1510 | } | |
1511 | ||
e314dbdc PE |
1512 | return 0; |
1513 | } | |
1514 | ||
11687a10 DM |
1515 | static void veth_dev_free(struct net_device *dev) |
1516 | { | |
7797b93b | 1517 | veth_free_queues(dev); |
14d73416 | 1518 | free_percpu(dev->lstats); |
11687a10 DM |
1519 | } |
1520 | ||
bb446c19 WC |
1521 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1522 | static void veth_poll_controller(struct net_device *dev) | |
1523 | { | |
1524 | /* veth only receives frames when its peer sends one | |
948d4f21 | 1525 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
1526 | * never to have pending data when we poll for it so |
1527 | * there is nothing to do here. | |
1528 | * | |
1529 | * We need this though so netpoll recognizes us as an interface that | |
1530 | * supports polling, which enables bridge devices in virt setups to | |
1531 | * still use netconsole | |
1532 | */ | |
1533 | } | |
1534 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
1535 | ||
a45253bf ND |
1536 | static int veth_get_iflink(const struct net_device *dev) |
1537 | { | |
1538 | struct veth_priv *priv = netdev_priv(dev); | |
1539 | struct net_device *peer; | |
1540 | int iflink; | |
1541 | ||
1542 | rcu_read_lock(); | |
1543 | peer = rcu_dereference(priv->peer); | |
1544 | iflink = peer ? peer->ifindex : 0; | |
1545 | rcu_read_unlock(); | |
1546 | ||
1547 | return iflink; | |
1548 | } | |
1549 | ||
dc224822 TM |
1550 | static netdev_features_t veth_fix_features(struct net_device *dev, |
1551 | netdev_features_t features) | |
1552 | { | |
1553 | struct veth_priv *priv = netdev_priv(dev); | |
1554 | struct net_device *peer; | |
1555 | ||
1556 | peer = rtnl_dereference(priv->peer); | |
1557 | if (peer) { | |
1558 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1559 | ||
1560 | if (peer_priv->_xdp_prog) | |
1561 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1562 | } | |
d3256efd PA |
1563 | if (priv->_xdp_prog) |
1564 | features |= NETIF_F_GRO; | |
dc224822 TM |
1565 | |
1566 | return features; | |
1567 | } | |
1568 | ||
d3256efd PA |
1569 | static int veth_set_features(struct net_device *dev, |
1570 | netdev_features_t features) | |
1571 | { | |
1572 | netdev_features_t changed = features ^ dev->features; | |
1573 | struct veth_priv *priv = netdev_priv(dev); | |
8267fc71 | 1574 | struct net_device *peer; |
d3256efd PA |
1575 | int err; |
1576 | ||
1577 | if (!(changed & NETIF_F_GRO) || !(dev->flags & IFF_UP) || priv->_xdp_prog) | |
1578 | return 0; | |
1579 | ||
8267fc71 | 1580 | peer = rtnl_dereference(priv->peer); |
d3256efd | 1581 | if (features & NETIF_F_GRO) { |
5e8d3dc7 HQ |
1582 | err = veth_napi_enable(dev); |
1583 | if (err) | |
1584 | return err; | |
fccca038 | 1585 | |
8267fc71 LB |
1586 | if (peer) |
1587 | xdp_features_set_redirect_target(peer, true); | |
d3256efd | 1588 | } else { |
8267fc71 LB |
1589 | if (peer) |
1590 | xdp_features_clear_redirect_target(peer); | |
5e8d3dc7 | 1591 | veth_napi_del(dev); |
d3256efd PA |
1592 | } |
1593 | return 0; | |
1594 | } | |
1595 | ||
163e5292 PA |
1596 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1597 | { | |
1598 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1599 | struct net_device *peer; | |
1600 | ||
1601 | if (new_hr < 0) | |
1602 | new_hr = 0; | |
1603 | ||
1604 | rcu_read_lock(); | |
1605 | peer = rcu_dereference(priv->peer); | |
1606 | if (unlikely(!peer)) | |
1607 | goto out; | |
1608 | ||
1609 | peer_priv = netdev_priv(peer); | |
1610 | priv->requested_headroom = new_hr; | |
1611 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1612 | dev->needed_headroom = new_hr; | |
1613 | peer->needed_headroom = new_hr; | |
1614 | ||
1615 | out: | |
1616 | rcu_read_unlock(); | |
1617 | } | |
1618 | ||
948d4f21 TM |
1619 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1620 | struct netlink_ext_ack *extack) | |
1621 | { | |
1622 | struct veth_priv *priv = netdev_priv(dev); | |
1623 | struct bpf_prog *old_prog; | |
1624 | struct net_device *peer; | |
dc224822 | 1625 | unsigned int max_mtu; |
948d4f21 TM |
1626 | int err; |
1627 | ||
1628 | old_prog = priv->_xdp_prog; | |
1629 | priv->_xdp_prog = prog; | |
1630 | peer = rtnl_dereference(priv->peer); | |
1631 | ||
1632 | if (prog) { | |
1633 | if (!peer) { | |
1634 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1635 | err = -ENOTCONN; | |
1636 | goto err; | |
1637 | } | |
1638 | ||
7cda76d8 LB |
1639 | max_mtu = SKB_WITH_OVERHEAD(PAGE_SIZE - VETH_XDP_HEADROOM) - |
1640 | peer->hard_header_len; | |
1641 | /* Allow increasing the max_mtu if the program supports | |
1642 | * XDP fragments. | |
1643 | */ | |
1644 | if (prog->aux->xdp_has_frags) | |
1645 | max_mtu += PAGE_SIZE * MAX_SKB_FRAGS; | |
1646 | ||
dc224822 TM |
1647 | if (peer->mtu > max_mtu) { |
1648 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1649 | err = -ERANGE; | |
1650 | goto err; | |
1651 | } | |
1652 | ||
638264dc TM |
1653 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1654 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1655 | err = -ENOSPC; | |
1656 | goto err; | |
1657 | } | |
1658 | ||
948d4f21 TM |
1659 | if (dev->flags & IFF_UP) { |
1660 | err = veth_enable_xdp(dev); | |
1661 | if (err) { | |
1662 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1663 | goto err; | |
1664 | } | |
1665 | } | |
dc224822 TM |
1666 | |
1667 | if (!old_prog) { | |
1668 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1669 | peer->max_mtu = max_mtu; | |
1670 | } | |
fccca038 | 1671 | |
8267fc71 | 1672 | xdp_features_set_redirect_target(peer, true); |
948d4f21 TM |
1673 | } |
1674 | ||
1675 | if (old_prog) { | |
dc224822 | 1676 | if (!prog) { |
8267fc71 LB |
1677 | if (peer && !veth_gro_requested(dev)) |
1678 | xdp_features_clear_redirect_target(peer); | |
fccca038 | 1679 | |
dc224822 TM |
1680 | if (dev->flags & IFF_UP) |
1681 | veth_disable_xdp(dev); | |
1682 | ||
1683 | if (peer) { | |
1684 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1685 | peer->max_mtu = ETH_MAX_MTU; | |
1686 | } | |
1687 | } | |
948d4f21 TM |
1688 | bpf_prog_put(old_prog); |
1689 | } | |
1690 | ||
dc224822 TM |
1691 | if ((!!old_prog ^ !!prog) && peer) |
1692 | netdev_update_features(peer); | |
1693 | ||
948d4f21 TM |
1694 | return 0; |
1695 | err: | |
1696 | priv->_xdp_prog = old_prog; | |
1697 | ||
1698 | return err; | |
1699 | } | |
1700 | ||
948d4f21 TM |
1701 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
1702 | { | |
1703 | switch (xdp->command) { | |
1704 | case XDP_SETUP_PROG: | |
1705 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
948d4f21 TM |
1706 | default: |
1707 | return -EINVAL; | |
1708 | } | |
1709 | } | |
1710 | ||
306531f0 SF |
1711 | static int veth_xdp_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp) |
1712 | { | |
1713 | struct veth_xdp_buff *_ctx = (void *)ctx; | |
1714 | ||
1715 | if (!_ctx->skb) | |
915efd8a | 1716 | return -ENODATA; |
306531f0 SF |
1717 | |
1718 | *timestamp = skb_hwtstamps(_ctx->skb)->hwtstamp; | |
1719 | return 0; | |
1720 | } | |
1721 | ||
0cd917a4 JDB |
1722 | static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash, |
1723 | enum xdp_rss_hash_type *rss_type) | |
306531f0 SF |
1724 | { |
1725 | struct veth_xdp_buff *_ctx = (void *)ctx; | |
96b1a098 | 1726 | struct sk_buff *skb = _ctx->skb; |
306531f0 | 1727 | |
96b1a098 | 1728 | if (!skb) |
915efd8a | 1729 | return -ENODATA; |
306531f0 | 1730 | |
96b1a098 JDB |
1731 | *hash = skb_get_hash(skb); |
1732 | *rss_type = skb->l4_hash ? XDP_RSS_TYPE_L4_ANY : XDP_RSS_TYPE_NONE; | |
1733 | ||
306531f0 SF |
1734 | return 0; |
1735 | } | |
1736 | ||
4456e7bd | 1737 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1738 | .ndo_init = veth_dev_init, |
1739 | .ndo_open = veth_open, | |
2cf48a10 | 1740 | .ndo_stop = veth_close, |
ee923623 | 1741 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1742 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1743 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1744 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1745 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1746 | .ndo_poll_controller = veth_poll_controller, | |
1747 | #endif | |
a45253bf | 1748 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1749 | .ndo_fix_features = veth_fix_features, |
d3256efd | 1750 | .ndo_set_features = veth_set_features, |
1a04a821 | 1751 | .ndo_features_check = passthru_features_check, |
163e5292 | 1752 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1753 | .ndo_bpf = veth_xdp, |
9152cff0 | 1754 | .ndo_xdp_xmit = veth_ndo_xdp_xmit, |
9aa1206e | 1755 | .ndo_get_peer_dev = veth_peer_dev, |
4456e7bd SH |
1756 | }; |
1757 | ||
306531f0 SF |
1758 | static const struct xdp_metadata_ops veth_xdp_metadata_ops = { |
1759 | .xmo_rx_timestamp = veth_xdp_rx_timestamp, | |
1760 | .xmo_rx_hash = veth_xdp_rx_hash, | |
1761 | }; | |
1762 | ||
732912d7 | 1763 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1764 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1765 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1766 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1767 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1768 | |
e314dbdc PE |
1769 | static void veth_setup(struct net_device *dev) |
1770 | { | |
1771 | ether_setup(dev); | |
1772 | ||
550fd08c | 1773 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1774 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1775 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1776 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1777 | |
4456e7bd | 1778 | dev->netdev_ops = &veth_netdev_ops; |
306531f0 | 1779 | dev->xdp_metadata_ops = &veth_xdp_metadata_ops; |
e314dbdc PE |
1780 | dev->ethtool_ops = &veth_ethtool_ops; |
1781 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1782 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1783 | dev->vlan_features = dev->features & |
3f8c707b VY |
1784 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1785 | NETIF_F_HW_VLAN_STAG_TX | | |
1786 | NETIF_F_HW_VLAN_CTAG_RX | | |
1787 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1788 | dev->needs_free_netdev = true; |
1789 | dev->priv_destructor = veth_dev_free; | |
91572088 | 1790 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1791 | |
8093315a | 1792 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1793 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1794 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
d406099d | 1795 | netif_set_tso_max_size(dev, GSO_MAX_SIZE); |
e314dbdc PE |
1796 | } |
1797 | ||
1798 | /* | |
1799 | * netlink interface | |
1800 | */ | |
1801 | ||
a8b8a889 MS |
1802 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1803 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1804 | { |
1805 | if (tb[IFLA_ADDRESS]) { | |
1806 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1807 | return -EINVAL; | |
1808 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1809 | return -EADDRNOTAVAIL; | |
1810 | } | |
38d40815 EB |
1811 | if (tb[IFLA_MTU]) { |
1812 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1813 | return -EINVAL; | |
1814 | } | |
e314dbdc PE |
1815 | return 0; |
1816 | } | |
1817 | ||
1818 | static struct rtnl_link_ops veth_link_ops; | |
1819 | ||
d3256efd PA |
1820 | static void veth_disable_gro(struct net_device *dev) |
1821 | { | |
1822 | dev->features &= ~NETIF_F_GRO; | |
1823 | dev->wanted_features &= ~NETIF_F_GRO; | |
1824 | netdev_update_features(dev); | |
1825 | } | |
1826 | ||
9d3684c2 PA |
1827 | static int veth_init_queues(struct net_device *dev, struct nlattr *tb[]) |
1828 | { | |
1829 | int err; | |
1830 | ||
1831 | if (!tb[IFLA_NUM_TX_QUEUES] && dev->num_tx_queues > 1) { | |
1832 | err = netif_set_real_num_tx_queues(dev, 1); | |
1833 | if (err) | |
1834 | return err; | |
1835 | } | |
1836 | if (!tb[IFLA_NUM_RX_QUEUES] && dev->num_rx_queues > 1) { | |
1837 | err = netif_set_real_num_rx_queues(dev, 1); | |
1838 | if (err) | |
1839 | return err; | |
1840 | } | |
1841 | return 0; | |
1842 | } | |
1843 | ||
81adee47 | 1844 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1845 | struct nlattr *tb[], struct nlattr *data[], |
1846 | struct netlink_ext_ack *extack) | |
e314dbdc | 1847 | { |
7797b93b | 1848 | int err; |
e314dbdc PE |
1849 | struct net_device *peer; |
1850 | struct veth_priv *priv; | |
1851 | char ifname[IFNAMSIZ]; | |
1852 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1853 | unsigned char name_assign_type; |
3729d502 | 1854 | struct ifinfomsg *ifmp; |
81adee47 | 1855 | struct net *net; |
e314dbdc PE |
1856 | |
1857 | /* | |
1858 | * create and register peer first | |
e314dbdc | 1859 | */ |
e314dbdc PE |
1860 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1861 | struct nlattr *nla_peer; | |
1862 | ||
1863 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1864 | ifmp = nla_data(nla_peer); |
f534f658 | 1865 | err = rtnl_nla_parse_ifinfomsg(peer_tb, nla_peer, extack); |
e314dbdc PE |
1866 | if (err < 0) |
1867 | return err; | |
1868 | ||
a8b8a889 | 1869 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1870 | if (err < 0) |
1871 | return err; | |
1872 | ||
1873 | tbp = peer_tb; | |
3729d502 PM |
1874 | } else { |
1875 | ifmp = NULL; | |
e314dbdc | 1876 | tbp = tb; |
3729d502 | 1877 | } |
e314dbdc | 1878 | |
191cdb38 | 1879 | if (ifmp && tbp[IFLA_IFNAME]) { |
872f6903 | 1880 | nla_strscpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1881 | name_assign_type = NET_NAME_USER; |
1882 | } else { | |
e314dbdc | 1883 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1884 | name_assign_type = NET_NAME_ENUM; |
1885 | } | |
e314dbdc | 1886 | |
81adee47 EB |
1887 | net = rtnl_link_get_net(src_net, tbp); |
1888 | if (IS_ERR(net)) | |
1889 | return PTR_ERR(net); | |
1890 | ||
5517750f | 1891 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1892 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1893 | if (IS_ERR(peer)) { |
1894 | put_net(net); | |
e314dbdc | 1895 | return PTR_ERR(peer); |
81adee47 | 1896 | } |
e314dbdc | 1897 | |
191cdb38 | 1898 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1899 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1900 | |
1901 | if (ifmp && (dev->ifindex != 0)) | |
1902 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1903 | |
6df6398f | 1904 | netif_inherit_tso_max(peer, dev); |
72d24955 | 1905 | |
e314dbdc | 1906 | err = register_netdevice(peer); |
81adee47 EB |
1907 | put_net(net); |
1908 | net = NULL; | |
e314dbdc PE |
1909 | if (err < 0) |
1910 | goto err_register_peer; | |
1911 | ||
d3256efd PA |
1912 | /* keep GRO disabled by default to be consistent with the established |
1913 | * veth behavior | |
1914 | */ | |
1915 | veth_disable_gro(peer); | |
e314dbdc PE |
1916 | netif_carrier_off(peer); |
1917 | ||
1d997f10 | 1918 | err = rtnl_configure_link(peer, ifmp, 0, NULL); |
3729d502 PM |
1919 | if (err < 0) |
1920 | goto err_configure_peer; | |
1921 | ||
e314dbdc PE |
1922 | /* |
1923 | * register dev last | |
1924 | * | |
1925 | * note, that since we've registered new device the dev's name | |
1926 | * should be re-allocated | |
1927 | */ | |
1928 | ||
1929 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1930 | eth_hw_addr_random(dev); |
e314dbdc | 1931 | |
6c8c4446 | 1932 | if (tb[IFLA_IFNAME]) |
872f6903 | 1933 | nla_strscpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); |
6c8c4446 JP |
1934 | else |
1935 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1936 | ||
e314dbdc PE |
1937 | err = register_netdevice(dev); |
1938 | if (err < 0) | |
1939 | goto err_register_dev; | |
1940 | ||
1941 | netif_carrier_off(dev); | |
1942 | ||
1943 | /* | |
1944 | * tie the deviced together | |
1945 | */ | |
1946 | ||
1947 | priv = netdev_priv(dev); | |
d0e2c55e | 1948 | rcu_assign_pointer(priv->peer, peer); |
9d3684c2 PA |
1949 | err = veth_init_queues(dev, tb); |
1950 | if (err) | |
1951 | goto err_queues; | |
e314dbdc PE |
1952 | |
1953 | priv = netdev_priv(peer); | |
d0e2c55e | 1954 | rcu_assign_pointer(priv->peer, dev); |
9d3684c2 PA |
1955 | err = veth_init_queues(peer, tb); |
1956 | if (err) | |
1957 | goto err_queues; | |
948d4f21 | 1958 | |
d3256efd | 1959 | veth_disable_gro(dev); |
fccca038 LB |
1960 | /* update XDP supported features */ |
1961 | veth_set_xdp_features(dev); | |
1962 | veth_set_xdp_features(peer); | |
1963 | ||
e314dbdc PE |
1964 | return 0; |
1965 | ||
9d3684c2 PA |
1966 | err_queues: |
1967 | unregister_netdevice(dev); | |
e314dbdc PE |
1968 | err_register_dev: |
1969 | /* nothing to do */ | |
3729d502 | 1970 | err_configure_peer: |
e314dbdc PE |
1971 | unregister_netdevice(peer); |
1972 | return err; | |
1973 | ||
1974 | err_register_peer: | |
1975 | free_netdev(peer); | |
1976 | return err; | |
1977 | } | |
1978 | ||
23289a37 | 1979 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1980 | { |
1981 | struct veth_priv *priv; | |
1982 | struct net_device *peer; | |
1983 | ||
1984 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1985 | peer = rtnl_dereference(priv->peer); |
1986 | ||
1987 | /* Note : dellink() is called from default_device_exit_batch(), | |
1988 | * before a rcu_synchronize() point. The devices are guaranteed | |
1989 | * not being freed before one RCU grace period. | |
1990 | */ | |
1991 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1992 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1993 | |
1994 | if (peer) { | |
1995 | priv = netdev_priv(peer); | |
1996 | RCU_INIT_POINTER(priv->peer, NULL); | |
1997 | unregister_netdevice_queue(peer, head); | |
1998 | } | |
e314dbdc PE |
1999 | } |
2000 | ||
23711438 TG |
2001 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
2002 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
2003 | }; | |
e314dbdc | 2004 | |
e5f4e7b9 ND |
2005 | static struct net *veth_get_link_net(const struct net_device *dev) |
2006 | { | |
2007 | struct veth_priv *priv = netdev_priv(dev); | |
2008 | struct net_device *peer = rtnl_dereference(priv->peer); | |
2009 | ||
2010 | return peer ? dev_net(peer) : dev_net(dev); | |
2011 | } | |
2012 | ||
9d3684c2 PA |
2013 | static unsigned int veth_get_num_queues(void) |
2014 | { | |
2015 | /* enforce the same queue limit as rtnl_create_link */ | |
2016 | int queues = num_possible_cpus(); | |
2017 | ||
2018 | if (queues > 4096) | |
2019 | queues = 4096; | |
2020 | return queues; | |
2021 | } | |
2022 | ||
e314dbdc PE |
2023 | static struct rtnl_link_ops veth_link_ops = { |
2024 | .kind = DRV_NAME, | |
2025 | .priv_size = sizeof(struct veth_priv), | |
2026 | .setup = veth_setup, | |
2027 | .validate = veth_validate, | |
2028 | .newlink = veth_newlink, | |
2029 | .dellink = veth_dellink, | |
2030 | .policy = veth_policy, | |
2031 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 2032 | .get_link_net = veth_get_link_net, |
9d3684c2 PA |
2033 | .get_num_tx_queues = veth_get_num_queues, |
2034 | .get_num_rx_queues = veth_get_num_queues, | |
e314dbdc PE |
2035 | }; |
2036 | ||
2037 | /* | |
2038 | * init/fini | |
2039 | */ | |
2040 | ||
2041 | static __init int veth_init(void) | |
2042 | { | |
2043 | return rtnl_link_register(&veth_link_ops); | |
2044 | } | |
2045 | ||
2046 | static __exit void veth_exit(void) | |
2047 | { | |
68365458 | 2048 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
2049 | } |
2050 | ||
2051 | module_init(veth_init); | |
2052 | module_exit(veth_exit); | |
2053 | ||
2054 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
2055 | MODULE_LICENSE("GPL v2"); | |
2056 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |