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 | 239 | } |
818ad9cc | 240 | pp_idx = idx + dev->real_num_tx_queues * VETH_TQ_STATS_LEN; |
4fc41805 LB |
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) | |
6f2684bf | 376 | dev_sw_netstats_tx_add(dev, 1, 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 | ||
65780c56 | 390 | static void veth_stats_rx(struct veth_stats *result, struct net_device *dev) |
4195e54a TM |
391 | { |
392 | struct veth_priv *priv = netdev_priv(dev); | |
393 | int i; | |
394 | ||
5fe6e567 | 395 | result->peer_tq_xdp_xmit_err = 0; |
4195e54a | 396 | result->xdp_packets = 0; |
d99a7c2f | 397 | result->xdp_tx_err = 0; |
4195e54a | 398 | result->xdp_bytes = 0; |
66fe4a07 | 399 | result->rx_drops = 0; |
4195e54a | 400 | for (i = 0; i < dev->num_rx_queues; i++) { |
5fe6e567 | 401 | u64 packets, bytes, drops, xdp_tx_err, peer_tq_xdp_xmit_err; |
4195e54a | 402 | struct veth_rq_stats *stats = &priv->rq[i].stats; |
4195e54a TM |
403 | unsigned int start; |
404 | ||
405 | do { | |
068c38ad | 406 | start = u64_stats_fetch_begin(&stats->syncp); |
5fe6e567 | 407 | peer_tq_xdp_xmit_err = stats->vs.peer_tq_xdp_xmit_err; |
d99a7c2f | 408 | xdp_tx_err = stats->vs.xdp_tx_err; |
65780c56 LB |
409 | packets = stats->vs.xdp_packets; |
410 | bytes = stats->vs.xdp_bytes; | |
66fe4a07 | 411 | drops = stats->vs.rx_drops; |
068c38ad | 412 | } while (u64_stats_fetch_retry(&stats->syncp, start)); |
5fe6e567 | 413 | result->peer_tq_xdp_xmit_err += peer_tq_xdp_xmit_err; |
d99a7c2f | 414 | result->xdp_tx_err += xdp_tx_err; |
4195e54a TM |
415 | result->xdp_packets += packets; |
416 | result->xdp_bytes += bytes; | |
66fe4a07 | 417 | result->rx_drops += drops; |
4195e54a TM |
418 | } |
419 | } | |
420 | ||
bc1f4470 | 421 | static void veth_get_stats64(struct net_device *dev, |
422 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
423 | { |
424 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 425 | struct net_device *peer; |
65780c56 | 426 | struct veth_stats rx; |
4195e54a | 427 | |
6f2684bf PY |
428 | tot->tx_dropped = atomic64_read(&priv->dropped); |
429 | dev_fetch_sw_netstats(tot, dev->tstats); | |
2681128f | 430 | |
4195e54a | 431 | veth_stats_rx(&rx, dev); |
5fe6e567 LB |
432 | tot->tx_dropped += rx.xdp_tx_err; |
433 | tot->rx_dropped = rx.rx_drops + rx.peer_tq_xdp_xmit_err; | |
6f2684bf PY |
434 | tot->rx_bytes += rx.xdp_bytes; |
435 | tot->rx_packets += rx.xdp_packets; | |
2681128f | 436 | |
d0e2c55e ED |
437 | rcu_read_lock(); |
438 | peer = rcu_dereference(priv->peer); | |
439 | if (peer) { | |
6f2684bf PY |
440 | struct rtnl_link_stats64 tot_peer = {}; |
441 | ||
442 | dev_fetch_sw_netstats(&tot_peer, peer->tstats); | |
443 | tot->rx_bytes += tot_peer.tx_bytes; | |
444 | tot->rx_packets += tot_peer.tx_packets; | |
4195e54a TM |
445 | |
446 | veth_stats_rx(&rx, peer); | |
5fe6e567 LB |
447 | tot->tx_dropped += rx.peer_tq_xdp_xmit_err; |
448 | tot->rx_dropped += rx.xdp_tx_err; | |
4195e54a TM |
449 | tot->tx_bytes += rx.xdp_bytes; |
450 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
451 | } |
452 | rcu_read_unlock(); | |
e314dbdc PE |
453 | } |
454 | ||
5c70ef85 G |
455 | /* fake multicast ability */ |
456 | static void veth_set_multicast_list(struct net_device *dev) | |
457 | { | |
458 | } | |
459 | ||
638264dc TM |
460 | static int veth_select_rxq(struct net_device *dev) |
461 | { | |
462 | return smp_processor_id() % dev->real_num_rx_queues; | |
463 | } | |
464 | ||
9aa1206e DB |
465 | static struct net_device *veth_peer_dev(struct net_device *dev) |
466 | { | |
467 | struct veth_priv *priv = netdev_priv(dev); | |
468 | ||
469 | /* Callers must be under RCU read side. */ | |
470 | return rcu_dereference(priv->peer); | |
471 | } | |
472 | ||
af87a3aa | 473 | static int veth_xdp_xmit(struct net_device *dev, int n, |
9152cff0 LB |
474 | struct xdp_frame **frames, |
475 | u32 flags, bool ndo_xmit) | |
af87a3aa TM |
476 | { |
477 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
fdc13979 | 478 | int i, ret = -ENXIO, nxmit = 0; |
af87a3aa | 479 | struct net_device *rcv; |
5fe6e567 | 480 | unsigned int max_len; |
638264dc | 481 | struct veth_rq *rq; |
af87a3aa | 482 | |
5fe6e567 | 483 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
d99a7c2f | 484 | return -EINVAL; |
af87a3aa | 485 | |
5fe6e567 | 486 | rcu_read_lock(); |
af87a3aa | 487 | rcv = rcu_dereference(priv->peer); |
5fe6e567 LB |
488 | if (unlikely(!rcv)) |
489 | goto out; | |
af87a3aa TM |
490 | |
491 | rcv_priv = netdev_priv(rcv); | |
5fe6e567 | 492 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
0e672f30 THJ |
493 | /* The napi pointer is set if NAPI is enabled, which ensures that |
494 | * xdp_ring is initialized on receive side and the peer device is up. | |
af87a3aa | 495 | */ |
0e672f30 | 496 | if (!rcu_access_pointer(rq->napi)) |
5fe6e567 | 497 | goto out; |
af87a3aa TM |
498 | |
499 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; | |
500 | ||
638264dc | 501 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
502 | for (i = 0; i < n; i++) { |
503 | struct xdp_frame *frame = frames[i]; | |
504 | void *ptr = veth_xdp_to_ptr(frame); | |
505 | ||
5142239a | 506 | if (unlikely(xdp_get_frame_len(frame) > max_len || |
fdc13979 LB |
507 | __ptr_ring_produce(&rq->xdp_ring, ptr))) |
508 | break; | |
509 | nxmit++; | |
af87a3aa | 510 | } |
638264dc | 511 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
512 | |
513 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 514 | __veth_xdp_flush(rq); |
af87a3aa | 515 | |
fdc13979 | 516 | ret = nxmit; |
9152cff0 | 517 | if (ndo_xmit) { |
5fe6e567 | 518 | u64_stats_update_begin(&rq->stats.syncp); |
fdc13979 LB |
519 | rq->stats.vs.peer_tq_xdp_xmit += nxmit; |
520 | rq->stats.vs.peer_tq_xdp_xmit_err += n - nxmit; | |
5fe6e567 | 521 | u64_stats_update_end(&rq->stats.syncp); |
9152cff0 | 522 | } |
9152cff0 | 523 | |
5fe6e567 | 524 | out: |
b23bfa56 | 525 | rcu_read_unlock(); |
2131479d TM |
526 | |
527 | return ret; | |
af87a3aa TM |
528 | } |
529 | ||
9152cff0 LB |
530 | static int veth_ndo_xdp_xmit(struct net_device *dev, int n, |
531 | struct xdp_frame **frames, u32 flags) | |
532 | { | |
5fe6e567 LB |
533 | int err; |
534 | ||
535 | err = veth_xdp_xmit(dev, n, frames, flags, true); | |
536 | if (err < 0) { | |
537 | struct veth_priv *priv = netdev_priv(dev); | |
538 | ||
539 | atomic64_add(n, &priv->dropped); | |
540 | } | |
541 | ||
542 | return err; | |
9152cff0 LB |
543 | } |
544 | ||
bd32aa1f | 545 | static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
9cda7807 | 546 | { |
fdc13979 | 547 | int sent, i, err = 0, drops; |
9cda7807 | 548 | |
bd32aa1f | 549 | sent = veth_xdp_xmit(rq->dev, bq->count, bq->q, 0, false); |
9cda7807 TM |
550 | if (sent < 0) { |
551 | err = sent; | |
552 | sent = 0; | |
9cda7807 | 553 | } |
fdc13979 LB |
554 | |
555 | for (i = sent; unlikely(i < bq->count); i++) | |
556 | xdp_return_frame(bq->q[i]); | |
557 | ||
558 | drops = bq->count - sent; | |
559 | trace_xdp_bulk_tx(rq->dev, sent, drops, err); | |
9cda7807 | 560 | |
5fe6e567 LB |
561 | u64_stats_update_begin(&rq->stats.syncp); |
562 | rq->stats.vs.xdp_tx += sent; | |
fdc13979 | 563 | rq->stats.vs.xdp_tx_err += drops; |
5fe6e567 LB |
564 | u64_stats_update_end(&rq->stats.syncp); |
565 | ||
9cda7807 TM |
566 | bq->count = 0; |
567 | } | |
568 | ||
bd32aa1f | 569 | static void veth_xdp_flush(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
d1396004 | 570 | { |
bd32aa1f | 571 | struct veth_priv *rcv_priv, *priv = netdev_priv(rq->dev); |
d1396004 | 572 | struct net_device *rcv; |
bd32aa1f | 573 | struct veth_rq *rcv_rq; |
d1396004 TM |
574 | |
575 | rcu_read_lock(); | |
bd32aa1f | 576 | veth_xdp_flush_bq(rq, bq); |
d1396004 TM |
577 | rcv = rcu_dereference(priv->peer); |
578 | if (unlikely(!rcv)) | |
579 | goto out; | |
580 | ||
581 | rcv_priv = netdev_priv(rcv); | |
bd32aa1f | 582 | rcv_rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 583 | /* xdp_ring is initialized on receive side? */ |
bd32aa1f | 584 | if (unlikely(!rcu_access_pointer(rcv_rq->xdp_prog))) |
d1396004 TM |
585 | goto out; |
586 | ||
bd32aa1f | 587 | __veth_xdp_flush(rcv_rq); |
d1396004 TM |
588 | out: |
589 | rcu_read_unlock(); | |
590 | } | |
591 | ||
bd32aa1f | 592 | static int veth_xdp_tx(struct veth_rq *rq, struct xdp_buff *xdp, |
9cda7807 | 593 | struct veth_xdp_tx_bq *bq) |
d1396004 | 594 | { |
1b698fa5 | 595 | struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp); |
d1396004 TM |
596 | |
597 | if (unlikely(!frame)) | |
598 | return -EOVERFLOW; | |
599 | ||
9cda7807 | 600 | if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE)) |
bd32aa1f | 601 | veth_xdp_flush_bq(rq, bq); |
9cda7807 TM |
602 | |
603 | bq->q[bq->count++] = frame; | |
604 | ||
605 | return 0; | |
d1396004 TM |
606 | } |
607 | ||
65e6dcf7 LB |
608 | static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq, |
609 | struct xdp_frame *frame, | |
610 | struct veth_xdp_tx_bq *bq, | |
611 | struct veth_stats *stats) | |
9fc8d518 | 612 | { |
d1396004 | 613 | struct xdp_frame orig_frame; |
9fc8d518 | 614 | struct bpf_prog *xdp_prog; |
9fc8d518 TM |
615 | |
616 | rcu_read_lock(); | |
638264dc | 617 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 | 618 | if (likely(xdp_prog)) { |
fefb695a SF |
619 | struct veth_xdp_buff vxbuf; |
620 | struct xdp_buff *xdp = &vxbuf.xdp; | |
9fc8d518 TM |
621 | u32 act; |
622 | ||
fefb695a SF |
623 | xdp_convert_frame_to_buff(frame, xdp); |
624 | xdp->rxq = &rq->xdp_rxq; | |
306531f0 | 625 | vxbuf.skb = NULL; |
9fc8d518 | 626 | |
fefb695a | 627 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
9fc8d518 TM |
628 | |
629 | switch (act) { | |
630 | case XDP_PASS: | |
fefb695a | 631 | if (xdp_update_frame_from_buff(xdp, frame)) |
89f479f0 | 632 | goto err_xdp; |
9fc8d518 | 633 | break; |
d1396004 TM |
634 | case XDP_TX: |
635 | orig_frame = *frame; | |
fefb695a SF |
636 | xdp->rxq->mem = frame->mem; |
637 | if (unlikely(veth_xdp_tx(rq, xdp, bq) < 0)) { | |
638264dc | 638 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 | 639 | frame = &orig_frame; |
1c5b82e5 | 640 | stats->rx_drops++; |
d1396004 TM |
641 | goto err_xdp; |
642 | } | |
1c5b82e5 | 643 | stats->xdp_tx++; |
d1396004 TM |
644 | rcu_read_unlock(); |
645 | goto xdp_xmit; | |
646 | case XDP_REDIRECT: | |
647 | orig_frame = *frame; | |
fefb695a SF |
648 | xdp->rxq->mem = frame->mem; |
649 | if (xdp_do_redirect(rq->dev, xdp, xdp_prog)) { | |
d1396004 | 650 | frame = &orig_frame; |
1c5b82e5 | 651 | stats->rx_drops++; |
d1396004 TM |
652 | goto err_xdp; |
653 | } | |
1c5b82e5 | 654 | stats->xdp_redirect++; |
d1396004 TM |
655 | rcu_read_unlock(); |
656 | goto xdp_xmit; | |
9fc8d518 | 657 | default: |
c8064e5b | 658 | bpf_warn_invalid_xdp_action(rq->dev, xdp_prog, act); |
df561f66 | 659 | fallthrough; |
9fc8d518 | 660 | case XDP_ABORTED: |
638264dc | 661 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 662 | fallthrough; |
9fc8d518 | 663 | case XDP_DROP: |
1c5b82e5 | 664 | stats->xdp_drops++; |
9fc8d518 TM |
665 | goto err_xdp; |
666 | } | |
667 | } | |
668 | rcu_read_unlock(); | |
669 | ||
65e6dcf7 | 670 | return frame; |
9fc8d518 TM |
671 | err_xdp: |
672 | rcu_read_unlock(); | |
673 | xdp_return_frame(frame); | |
d1396004 | 674 | xdp_xmit: |
9fc8d518 TM |
675 | return NULL; |
676 | } | |
677 | ||
65e6dcf7 LB |
678 | /* frames array contains VETH_XDP_BATCH at most */ |
679 | static void veth_xdp_rcv_bulk_skb(struct veth_rq *rq, void **frames, | |
680 | int n_xdpf, struct veth_xdp_tx_bq *bq, | |
681 | struct veth_stats *stats) | |
682 | { | |
683 | void *skbs[VETH_XDP_BATCH]; | |
684 | int i; | |
685 | ||
686 | if (xdp_alloc_skb_bulk(skbs, n_xdpf, | |
687 | GFP_ATOMIC | __GFP_ZERO) < 0) { | |
688 | for (i = 0; i < n_xdpf; i++) | |
689 | xdp_return_frame(frames[i]); | |
690 | stats->rx_drops += n_xdpf; | |
691 | ||
692 | return; | |
693 | } | |
694 | ||
695 | for (i = 0; i < n_xdpf; i++) { | |
696 | struct sk_buff *skb = skbs[i]; | |
697 | ||
698 | skb = __xdp_build_skb_from_frame(frames[i], skb, | |
699 | rq->dev); | |
700 | if (!skb) { | |
701 | xdp_return_frame(frames[i]); | |
702 | stats->rx_drops++; | |
703 | continue; | |
704 | } | |
705 | napi_gro_receive(&rq->xdp_napi, skb); | |
706 | } | |
707 | } | |
708 | ||
718a18a0 | 709 | static void veth_xdp_get(struct xdp_buff *xdp) |
948d4f21 | 710 | { |
718a18a0 LB |
711 | struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); |
712 | int i; | |
948d4f21 | 713 | |
718a18a0 LB |
714 | get_page(virt_to_page(xdp->data)); |
715 | if (likely(!xdp_buff_has_frags(xdp))) | |
716 | return; | |
4bf9ffa0 | 717 | |
718a18a0 LB |
718 | for (i = 0; i < sinfo->nr_frags; i++) |
719 | __skb_frag_ref(&sinfo->frags[i]); | |
720 | } | |
948d4f21 | 721 | |
718a18a0 LB |
722 | static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq, |
723 | struct xdp_buff *xdp, | |
724 | struct sk_buff **pskb) | |
725 | { | |
726 | struct sk_buff *skb = *pskb; | |
727 | u32 frame_sz; | |
948d4f21 TM |
728 | |
729 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
7c101318 SB |
730 | skb_shinfo(skb)->nr_frags || |
731 | skb_headroom(skb) < XDP_PACKET_HEADROOM) { | |
27accb3c | 732 | if (skb_pp_cow_data(rq->page_pool, pskb, XDP_PACKET_HEADROOM)) |
948d4f21 | 733 | goto drop; |
718a18a0 | 734 | |
27accb3c | 735 | skb = *pskb; |
948d4f21 TM |
736 | } |
737 | ||
45a9e6d8 | 738 | /* SKB "head" area always have tailroom for skb_shared_info */ |
be9df4af | 739 | frame_sz = skb_end_pointer(skb) - skb->head; |
43b5169d | 740 | frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
718a18a0 LB |
741 | xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); |
742 | xdp_prepare_buff(xdp, skb->head, skb_headroom(skb), | |
743 | skb_headlen(skb), true); | |
744 | ||
745 | if (skb_is_nonlinear(skb)) { | |
746 | skb_shinfo(skb)->xdp_frags_size = skb->data_len; | |
747 | xdp_buff_set_frags_flag(xdp); | |
748 | } else { | |
749 | xdp_buff_clear_frags_flag(xdp); | |
750 | } | |
751 | *pskb = skb; | |
752 | ||
753 | return 0; | |
754 | drop: | |
755 | consume_skb(skb); | |
756 | *pskb = NULL; | |
757 | ||
758 | return -ENOMEM; | |
759 | } | |
760 | ||
761 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, | |
762 | struct sk_buff *skb, | |
763 | struct veth_xdp_tx_bq *bq, | |
764 | struct veth_stats *stats) | |
765 | { | |
766 | void *orig_data, *orig_data_end; | |
767 | struct bpf_prog *xdp_prog; | |
fefb695a SF |
768 | struct veth_xdp_buff vxbuf; |
769 | struct xdp_buff *xdp = &vxbuf.xdp; | |
718a18a0 LB |
770 | u32 act, metalen; |
771 | int off; | |
772 | ||
773 | skb_prepare_for_gro(skb); | |
774 | ||
775 | rcu_read_lock(); | |
776 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
777 | if (unlikely(!xdp_prog)) { | |
778 | rcu_read_unlock(); | |
779 | goto out; | |
780 | } | |
781 | ||
782 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
fefb695a | 783 | if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb)) |
718a18a0 | 784 | goto drop; |
306531f0 | 785 | vxbuf.skb = skb; |
45a9e6d8 | 786 | |
fefb695a SF |
787 | orig_data = xdp->data; |
788 | orig_data_end = xdp->data_end; | |
948d4f21 | 789 | |
fefb695a | 790 | act = bpf_prog_run_xdp(xdp_prog, xdp); |
948d4f21 TM |
791 | |
792 | switch (act) { | |
793 | case XDP_PASS: | |
794 | break; | |
d1396004 | 795 | case XDP_TX: |
fefb695a | 796 | veth_xdp_get(xdp); |
d1396004 | 797 | consume_skb(skb); |
fefb695a SF |
798 | xdp->rxq->mem = rq->xdp_mem; |
799 | if (unlikely(veth_xdp_tx(rq, xdp, bq) < 0)) { | |
638264dc | 800 | trace_xdp_exception(rq->dev, xdp_prog, act); |
1c5b82e5 | 801 | stats->rx_drops++; |
d1396004 TM |
802 | goto err_xdp; |
803 | } | |
1c5b82e5 | 804 | stats->xdp_tx++; |
d1396004 TM |
805 | rcu_read_unlock(); |
806 | goto xdp_xmit; | |
807 | case XDP_REDIRECT: | |
fefb695a | 808 | veth_xdp_get(xdp); |
d1396004 | 809 | consume_skb(skb); |
fefb695a SF |
810 | xdp->rxq->mem = rq->xdp_mem; |
811 | if (xdp_do_redirect(rq->dev, xdp, xdp_prog)) { | |
1c5b82e5 | 812 | stats->rx_drops++; |
d1396004 | 813 | goto err_xdp; |
1c5b82e5 LB |
814 | } |
815 | stats->xdp_redirect++; | |
d1396004 TM |
816 | rcu_read_unlock(); |
817 | goto xdp_xmit; | |
948d4f21 | 818 | default: |
c8064e5b | 819 | bpf_warn_invalid_xdp_action(rq->dev, xdp_prog, act); |
df561f66 | 820 | fallthrough; |
948d4f21 | 821 | case XDP_ABORTED: |
638264dc | 822 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 823 | fallthrough; |
948d4f21 | 824 | case XDP_DROP: |
1c5b82e5 LB |
825 | stats->xdp_drops++; |
826 | goto xdp_drop; | |
948d4f21 TM |
827 | } |
828 | rcu_read_unlock(); | |
829 | ||
45a9e6d8 | 830 | /* check if bpf_xdp_adjust_head was used */ |
fefb695a | 831 | off = orig_data - xdp->data; |
948d4f21 TM |
832 | if (off > 0) |
833 | __skb_push(skb, off); | |
834 | else if (off < 0) | |
835 | __skb_pull(skb, -off); | |
718a18a0 LB |
836 | |
837 | skb_reset_mac_header(skb); | |
45a9e6d8 JDB |
838 | |
839 | /* check if bpf_xdp_adjust_tail was used */ | |
fefb695a | 840 | off = xdp->data_end - orig_data_end; |
948d4f21 | 841 | if (off != 0) |
45a9e6d8 | 842 | __skb_put(skb, off); /* positive on grow, negative on shrink */ |
718a18a0 LB |
843 | |
844 | /* XDP frag metadata (e.g. nr_frags) are updated in eBPF helpers | |
845 | * (e.g. bpf_xdp_adjust_tail), we need to update data_len here. | |
846 | */ | |
fefb695a | 847 | if (xdp_buff_has_frags(xdp)) |
718a18a0 LB |
848 | skb->data_len = skb_shinfo(skb)->xdp_frags_size; |
849 | else | |
850 | skb->data_len = 0; | |
851 | ||
638264dc | 852 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 | 853 | |
fefb695a | 854 | metalen = xdp->data - xdp->data_meta; |
948d4f21 TM |
855 | if (metalen) |
856 | skb_metadata_set(skb, metalen); | |
857 | out: | |
858 | return skb; | |
859 | drop: | |
1c5b82e5 LB |
860 | stats->rx_drops++; |
861 | xdp_drop: | |
948d4f21 TM |
862 | rcu_read_unlock(); |
863 | kfree_skb(skb); | |
864 | return NULL; | |
d1396004 TM |
865 | err_xdp: |
866 | rcu_read_unlock(); | |
fefb695a | 867 | xdp_return_buff(xdp); |
d1396004 TM |
868 | xdp_xmit: |
869 | return NULL; | |
948d4f21 TM |
870 | } |
871 | ||
1c5b82e5 LB |
872 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, |
873 | struct veth_xdp_tx_bq *bq, | |
874 | struct veth_stats *stats) | |
948d4f21 | 875 | { |
65e6dcf7 LB |
876 | int i, done = 0, n_xdpf = 0; |
877 | void *xdpf[VETH_XDP_BATCH]; | |
948d4f21 TM |
878 | |
879 | for (i = 0; i < budget; i++) { | |
638264dc | 880 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
948d4f21 | 881 | |
9fc8d518 | 882 | if (!ptr) |
948d4f21 TM |
883 | break; |
884 | ||
d1396004 | 885 | if (veth_is_xdp_frame(ptr)) { |
65e6dcf7 | 886 | /* ndo_xdp_xmit */ |
4195e54a TM |
887 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
888 | ||
5142239a | 889 | stats->xdp_bytes += xdp_get_frame_len(frame); |
65e6dcf7 LB |
890 | frame = veth_xdp_rcv_one(rq, frame, bq, stats); |
891 | if (frame) { | |
892 | /* XDP_PASS */ | |
893 | xdpf[n_xdpf++] = frame; | |
894 | if (n_xdpf == VETH_XDP_BATCH) { | |
895 | veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, | |
896 | bq, stats); | |
897 | n_xdpf = 0; | |
898 | } | |
899 | } | |
d1396004 | 900 | } else { |
65e6dcf7 LB |
901 | /* ndo_start_xmit */ |
902 | struct sk_buff *skb = ptr; | |
903 | ||
1c5b82e5 LB |
904 | stats->xdp_bytes += skb->len; |
905 | skb = veth_xdp_rcv_skb(rq, skb, bq, stats); | |
9695b7de PA |
906 | if (skb) { |
907 | if (skb_shared(skb) || skb_unclone(skb, GFP_ATOMIC)) | |
908 | netif_receive_skb(skb); | |
909 | else | |
910 | napi_gro_receive(&rq->xdp_napi, skb); | |
911 | } | |
d1396004 | 912 | } |
948d4f21 TM |
913 | done++; |
914 | } | |
915 | ||
65e6dcf7 LB |
916 | if (n_xdpf) |
917 | veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, bq, stats); | |
918 | ||
4195e54a | 919 | u64_stats_update_begin(&rq->stats.syncp); |
9152cff0 | 920 | rq->stats.vs.xdp_redirect += stats->xdp_redirect; |
1c5b82e5 | 921 | rq->stats.vs.xdp_bytes += stats->xdp_bytes; |
66fe4a07 LB |
922 | rq->stats.vs.xdp_drops += stats->xdp_drops; |
923 | rq->stats.vs.rx_drops += stats->rx_drops; | |
65780c56 | 924 | rq->stats.vs.xdp_packets += done; |
4195e54a TM |
925 | u64_stats_update_end(&rq->stats.syncp); |
926 | ||
948d4f21 TM |
927 | return done; |
928 | } | |
929 | ||
930 | static int veth_poll(struct napi_struct *napi, int budget) | |
931 | { | |
638264dc TM |
932 | struct veth_rq *rq = |
933 | container_of(napi, struct veth_rq, xdp_napi); | |
1c5b82e5 | 934 | struct veth_stats stats = {}; |
9cda7807 | 935 | struct veth_xdp_tx_bq bq; |
948d4f21 TM |
936 | int done; |
937 | ||
9cda7807 TM |
938 | bq.count = 0; |
939 | ||
d1396004 | 940 | xdp_set_return_frame_no_direct(); |
1c5b82e5 | 941 | done = veth_xdp_rcv(rq, budget, &bq, &stats); |
948d4f21 | 942 | |
fa349e39 SB |
943 | if (stats.xdp_redirect > 0) |
944 | xdp_do_flush(); | |
945 | ||
948d4f21 TM |
946 | if (done < budget && napi_complete_done(napi, done)) { |
947 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
948 | smp_store_mb(rq->rx_notify_masked, false); |
949 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
68468d8c ED |
950 | if (napi_schedule_prep(&rq->xdp_napi)) { |
951 | WRITE_ONCE(rq->rx_notify_masked, true); | |
952 | __napi_schedule(&rq->xdp_napi); | |
953 | } | |
948d4f21 TM |
954 | } |
955 | } | |
956 | ||
1c5b82e5 | 957 | if (stats.xdp_tx > 0) |
bd32aa1f | 958 | veth_xdp_flush(rq, &bq); |
d1396004 TM |
959 | xdp_clear_return_frame_no_direct(); |
960 | ||
948d4f21 TM |
961 | return done; |
962 | } | |
963 | ||
0ebab78c LB |
964 | static int veth_create_page_pool(struct veth_rq *rq) |
965 | { | |
966 | struct page_pool_params pp_params = { | |
967 | .order = 0, | |
968 | .pool_size = VETH_RING_SIZE, | |
969 | .nid = NUMA_NO_NODE, | |
970 | .dev = &rq->dev->dev, | |
971 | }; | |
972 | ||
973 | rq->page_pool = page_pool_create(&pp_params); | |
974 | if (IS_ERR(rq->page_pool)) { | |
975 | int err = PTR_ERR(rq->page_pool); | |
976 | ||
977 | rq->page_pool = NULL; | |
978 | return err; | |
979 | } | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
dedd53c5 | 984 | static int __veth_napi_enable_range(struct net_device *dev, int start, int end) |
948d4f21 TM |
985 | { |
986 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 987 | int err, i; |
948d4f21 | 988 | |
0ebab78c LB |
989 | for (i = start; i < end; i++) { |
990 | err = veth_create_page_pool(&priv->rq[i]); | |
991 | if (err) | |
992 | goto err_page_pool; | |
993 | } | |
994 | ||
dedd53c5 | 995 | for (i = start; i < end; i++) { |
638264dc TM |
996 | struct veth_rq *rq = &priv->rq[i]; |
997 | ||
998 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
999 | if (err) | |
1000 | goto err_xdp_ring; | |
1001 | } | |
948d4f21 | 1002 | |
dedd53c5 | 1003 | for (i = start; i < end; i++) { |
638264dc TM |
1004 | struct veth_rq *rq = &priv->rq[i]; |
1005 | ||
638264dc | 1006 | napi_enable(&rq->xdp_napi); |
d3256efd | 1007 | rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi); |
638264dc | 1008 | } |
948d4f21 TM |
1009 | |
1010 | return 0; | |
dedd53c5 | 1011 | |
638264dc | 1012 | err_xdp_ring: |
dedd53c5 | 1013 | for (i--; i >= start; i--) |
638264dc | 1014 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); |
8a519a57 | 1015 | i = end; |
0ebab78c | 1016 | err_page_pool: |
8a519a57 | 1017 | for (i--; i >= start; i--) { |
0ebab78c LB |
1018 | page_pool_destroy(priv->rq[i].page_pool); |
1019 | priv->rq[i].page_pool = NULL; | |
1020 | } | |
638264dc TM |
1021 | |
1022 | return err; | |
948d4f21 TM |
1023 | } |
1024 | ||
dedd53c5 PA |
1025 | static int __veth_napi_enable(struct net_device *dev) |
1026 | { | |
1027 | return __veth_napi_enable_range(dev, 0, dev->real_num_rx_queues); | |
1028 | } | |
1029 | ||
1030 | static void veth_napi_del_range(struct net_device *dev, int start, int end) | |
948d4f21 TM |
1031 | { |
1032 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1033 | int i; |
948d4f21 | 1034 | |
dedd53c5 | 1035 | for (i = start; i < end; i++) { |
638264dc TM |
1036 | struct veth_rq *rq = &priv->rq[i]; |
1037 | ||
d3256efd | 1038 | rcu_assign_pointer(priv->rq[i].napi, NULL); |
638264dc | 1039 | napi_disable(&rq->xdp_napi); |
5198d545 | 1040 | __netif_napi_del(&rq->xdp_napi); |
638264dc TM |
1041 | } |
1042 | synchronize_net(); | |
1043 | ||
dedd53c5 | 1044 | for (i = start; i < end; i++) { |
638264dc TM |
1045 | struct veth_rq *rq = &priv->rq[i]; |
1046 | ||
638264dc TM |
1047 | rq->rx_notify_masked = false; |
1048 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
1049 | } | |
0ebab78c LB |
1050 | |
1051 | for (i = start; i < end; i++) { | |
1052 | page_pool_destroy(priv->rq[i].page_pool); | |
1053 | priv->rq[i].page_pool = NULL; | |
1054 | } | |
948d4f21 TM |
1055 | } |
1056 | ||
dedd53c5 PA |
1057 | static void veth_napi_del(struct net_device *dev) |
1058 | { | |
1059 | veth_napi_del_range(dev, 0, dev->real_num_rx_queues); | |
1060 | } | |
1061 | ||
d3256efd PA |
1062 | static bool veth_gro_requested(const struct net_device *dev) |
1063 | { | |
1064 | return !!(dev->wanted_features & NETIF_F_GRO); | |
1065 | } | |
1066 | ||
dedd53c5 PA |
1067 | static int veth_enable_xdp_range(struct net_device *dev, int start, int end, |
1068 | bool napi_already_on) | |
948d4f21 TM |
1069 | { |
1070 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1071 | int err, i; |
948d4f21 | 1072 | |
dedd53c5 PA |
1073 | for (i = start; i < end; i++) { |
1074 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 1075 | |
dedd53c5 | 1076 | if (!napi_already_on) |
b48b89f9 | 1077 | netif_napi_add(dev, &rq->xdp_napi, veth_poll); |
dedd53c5 PA |
1078 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i, rq->xdp_napi.napi_id); |
1079 | if (err < 0) | |
1080 | goto err_rxq_reg; | |
1081 | ||
1082 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
1083 | MEM_TYPE_PAGE_SHARED, | |
1084 | NULL); | |
1085 | if (err < 0) | |
1086 | goto err_reg_mem; | |
1087 | ||
1088 | /* Save original mem info as it can be overwritten */ | |
1089 | rq->xdp_mem = rq->xdp_rxq.mem; | |
1090 | } | |
1091 | return 0; | |
638264dc | 1092 | |
dedd53c5 PA |
1093 | err_reg_mem: |
1094 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
1095 | err_rxq_reg: | |
1096 | for (i--; i >= start; i--) { | |
1097 | struct veth_rq *rq = &priv->rq[i]; | |
638264dc | 1098 | |
dedd53c5 PA |
1099 | xdp_rxq_info_unreg(&rq->xdp_rxq); |
1100 | if (!napi_already_on) | |
1101 | netif_napi_del(&rq->xdp_napi); | |
1102 | } | |
1103 | ||
1104 | return err; | |
1105 | } | |
1106 | ||
1107 | static void veth_disable_xdp_range(struct net_device *dev, int start, int end, | |
1108 | bool delete_napi) | |
1109 | { | |
1110 | struct veth_priv *priv = netdev_priv(dev); | |
1111 | int i; | |
1112 | ||
1113 | for (i = start; i < end; i++) { | |
1114 | struct veth_rq *rq = &priv->rq[i]; | |
1115 | ||
1116 | rq->xdp_rxq.mem = rq->xdp_mem; | |
1117 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
1118 | ||
1119 | if (delete_napi) | |
1120 | netif_napi_del(&rq->xdp_napi); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | static int veth_enable_xdp(struct net_device *dev) | |
1125 | { | |
5e8d3dc7 | 1126 | bool napi_already_on = veth_gro_requested(dev) && (dev->flags & IFF_UP); |
dedd53c5 PA |
1127 | struct veth_priv *priv = netdev_priv(dev); |
1128 | int err, i; | |
1129 | ||
1130 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { | |
1131 | err = veth_enable_xdp_range(dev, 0, dev->real_num_rx_queues, napi_already_on); | |
1132 | if (err) | |
1133 | return err; | |
948d4f21 | 1134 | |
d3256efd PA |
1135 | if (!napi_already_on) { |
1136 | err = __veth_napi_enable(dev); | |
dedd53c5 PA |
1137 | if (err) { |
1138 | veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, true); | |
1139 | return err; | |
1140 | } | |
d3256efd | 1141 | } |
948d4f21 TM |
1142 | } |
1143 | ||
d3256efd | 1144 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
638264dc | 1145 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); |
d3256efd PA |
1146 | rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi); |
1147 | } | |
948d4f21 TM |
1148 | |
1149 | return 0; | |
948d4f21 TM |
1150 | } |
1151 | ||
1152 | static void veth_disable_xdp(struct net_device *dev) | |
1153 | { | |
1154 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1155 | int i; |
948d4f21 | 1156 | |
638264dc TM |
1157 | for (i = 0; i < dev->real_num_rx_queues; i++) |
1158 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
d3256efd | 1159 | |
fe9f8013 | 1160 | if (!netif_running(dev) || !veth_gro_requested(dev)) |
d3256efd PA |
1161 | veth_napi_del(dev); |
1162 | ||
dedd53c5 | 1163 | veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, false); |
948d4f21 TM |
1164 | } |
1165 | ||
dedd53c5 | 1166 | static int veth_napi_enable_range(struct net_device *dev, int start, int end) |
d3256efd PA |
1167 | { |
1168 | struct veth_priv *priv = netdev_priv(dev); | |
1169 | int err, i; | |
1170 | ||
dedd53c5 | 1171 | for (i = start; i < end; i++) { |
d3256efd PA |
1172 | struct veth_rq *rq = &priv->rq[i]; |
1173 | ||
b48b89f9 | 1174 | netif_napi_add(dev, &rq->xdp_napi, veth_poll); |
d3256efd PA |
1175 | } |
1176 | ||
dedd53c5 | 1177 | err = __veth_napi_enable_range(dev, start, end); |
d3256efd | 1178 | if (err) { |
dedd53c5 | 1179 | for (i = start; i < end; i++) { |
d3256efd PA |
1180 | struct veth_rq *rq = &priv->rq[i]; |
1181 | ||
1182 | netif_napi_del(&rq->xdp_napi); | |
1183 | } | |
1184 | return err; | |
1185 | } | |
1186 | return err; | |
1187 | } | |
1188 | ||
dedd53c5 PA |
1189 | static int veth_napi_enable(struct net_device *dev) |
1190 | { | |
1191 | return veth_napi_enable_range(dev, 0, dev->real_num_rx_queues); | |
1192 | } | |
1193 | ||
4752eeb3 PA |
1194 | static void veth_disable_range_safe(struct net_device *dev, int start, int end) |
1195 | { | |
1196 | struct veth_priv *priv = netdev_priv(dev); | |
1197 | ||
1198 | if (start >= end) | |
1199 | return; | |
1200 | ||
1201 | if (priv->_xdp_prog) { | |
1202 | veth_napi_del_range(dev, start, end); | |
1203 | veth_disable_xdp_range(dev, start, end, false); | |
1204 | } else if (veth_gro_requested(dev)) { | |
1205 | veth_napi_del_range(dev, start, end); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | static int veth_enable_range_safe(struct net_device *dev, int start, int end) | |
1210 | { | |
1211 | struct veth_priv *priv = netdev_priv(dev); | |
1212 | int err; | |
1213 | ||
1214 | if (start >= end) | |
1215 | return 0; | |
1216 | ||
1217 | if (priv->_xdp_prog) { | |
1218 | /* these channels are freshly initialized, napi is not on there even | |
1219 | * when GRO is requeste | |
1220 | */ | |
1221 | err = veth_enable_xdp_range(dev, start, end, false); | |
1222 | if (err) | |
1223 | return err; | |
1224 | ||
1225 | err = __veth_napi_enable_range(dev, start, end); | |
1226 | if (err) { | |
1227 | /* on error always delete the newly added napis */ | |
1228 | veth_disable_xdp_range(dev, start, end, true); | |
1229 | return err; | |
1230 | } | |
1231 | } else if (veth_gro_requested(dev)) { | |
1232 | return veth_napi_enable_range(dev, start, end); | |
1233 | } | |
1234 | return 0; | |
1235 | } | |
1236 | ||
fccca038 LB |
1237 | static void veth_set_xdp_features(struct net_device *dev) |
1238 | { | |
1239 | struct veth_priv *priv = netdev_priv(dev); | |
1240 | struct net_device *peer; | |
1241 | ||
5ce76fe1 | 1242 | peer = rtnl_dereference(priv->peer); |
fccca038 | 1243 | if (peer && peer->real_num_tx_queues <= dev->real_num_rx_queues) { |
8267fc71 | 1244 | struct veth_priv *priv_peer = netdev_priv(peer); |
fccca038 LB |
1245 | xdp_features_t val = NETDEV_XDP_ACT_BASIC | |
1246 | NETDEV_XDP_ACT_REDIRECT | | |
1247 | NETDEV_XDP_ACT_RX_SG; | |
1248 | ||
8267fc71 | 1249 | if (priv_peer->_xdp_prog || veth_gro_requested(peer)) |
fccca038 LB |
1250 | val |= NETDEV_XDP_ACT_NDO_XMIT | |
1251 | NETDEV_XDP_ACT_NDO_XMIT_SG; | |
1252 | xdp_set_features_flag(dev, val); | |
1253 | } else { | |
1254 | xdp_clear_features_flag(dev); | |
1255 | } | |
1256 | } | |
1257 | ||
4752eeb3 PA |
1258 | static int veth_set_channels(struct net_device *dev, |
1259 | struct ethtool_channels *ch) | |
1260 | { | |
1261 | struct veth_priv *priv = netdev_priv(dev); | |
1262 | unsigned int old_rx_count, new_rx_count; | |
1263 | struct veth_priv *peer_priv; | |
1264 | struct net_device *peer; | |
1265 | int err; | |
1266 | ||
1267 | /* sanity check. Upper bounds are already enforced by the caller */ | |
1268 | if (!ch->rx_count || !ch->tx_count) | |
1269 | return -EINVAL; | |
1270 | ||
1271 | /* avoid braking XDP, if that is enabled */ | |
1272 | peer = rtnl_dereference(priv->peer); | |
1273 | peer_priv = peer ? netdev_priv(peer) : NULL; | |
1274 | if (priv->_xdp_prog && peer && ch->rx_count < peer->real_num_tx_queues) | |
1275 | return -EINVAL; | |
1276 | ||
1277 | if (peer && peer_priv && peer_priv->_xdp_prog && ch->tx_count > peer->real_num_rx_queues) | |
1278 | return -EINVAL; | |
1279 | ||
1280 | old_rx_count = dev->real_num_rx_queues; | |
1281 | new_rx_count = ch->rx_count; | |
1282 | if (netif_running(dev)) { | |
1283 | /* turn device off */ | |
1284 | netif_carrier_off(dev); | |
1285 | if (peer) | |
1286 | netif_carrier_off(peer); | |
1287 | ||
1288 | /* try to allocate new resurces, as needed*/ | |
1289 | err = veth_enable_range_safe(dev, old_rx_count, new_rx_count); | |
1290 | if (err) | |
1291 | goto out; | |
1292 | } | |
1293 | ||
1294 | err = netif_set_real_num_rx_queues(dev, ch->rx_count); | |
1295 | if (err) | |
1296 | goto revert; | |
1297 | ||
1298 | err = netif_set_real_num_tx_queues(dev, ch->tx_count); | |
1299 | if (err) { | |
1300 | int err2 = netif_set_real_num_rx_queues(dev, old_rx_count); | |
1301 | ||
1302 | /* this error condition could happen only if rx and tx change | |
1303 | * in opposite directions (e.g. tx nr raises, rx nr decreases) | |
1304 | * and we can't do anything to fully restore the original | |
1305 | * status | |
1306 | */ | |
1307 | if (err2) | |
1308 | pr_warn("Can't restore rx queues config %d -> %d %d", | |
1309 | new_rx_count, old_rx_count, err2); | |
1310 | else | |
1311 | goto revert; | |
1312 | } | |
1313 | ||
1314 | out: | |
1315 | if (netif_running(dev)) { | |
1316 | /* note that we need to swap the arguments WRT the enable part | |
1317 | * to identify the range we have to disable | |
1318 | */ | |
1319 | veth_disable_range_safe(dev, new_rx_count, old_rx_count); | |
1320 | netif_carrier_on(dev); | |
1321 | if (peer) | |
1322 | netif_carrier_on(peer); | |
1323 | } | |
fccca038 LB |
1324 | |
1325 | /* update XDP supported features */ | |
1326 | veth_set_xdp_features(dev); | |
1327 | if (peer) | |
1328 | veth_set_xdp_features(peer); | |
1329 | ||
4752eeb3 PA |
1330 | return err; |
1331 | ||
1332 | revert: | |
1333 | new_rx_count = old_rx_count; | |
1334 | old_rx_count = ch->rx_count; | |
1335 | goto out; | |
1336 | } | |
1337 | ||
e314dbdc PE |
1338 | static int veth_open(struct net_device *dev) |
1339 | { | |
5e8d3dc7 | 1340 | struct veth_priv *priv = netdev_priv(dev); |
d0e2c55e | 1341 | struct net_device *peer = rtnl_dereference(priv->peer); |
948d4f21 | 1342 | int err; |
e314dbdc | 1343 | |
d0e2c55e | 1344 | if (!peer) |
e314dbdc PE |
1345 | return -ENOTCONN; |
1346 | ||
948d4f21 TM |
1347 | if (priv->_xdp_prog) { |
1348 | err = veth_enable_xdp(dev); | |
1349 | if (err) | |
1350 | return err; | |
5e8d3dc7 | 1351 | } else if (veth_gro_requested(dev)) { |
d3256efd PA |
1352 | err = veth_napi_enable(dev); |
1353 | if (err) | |
1354 | return err; | |
948d4f21 TM |
1355 | } |
1356 | ||
d0e2c55e | 1357 | if (peer->flags & IFF_UP) { |
e314dbdc | 1358 | netif_carrier_on(dev); |
d0e2c55e | 1359 | netif_carrier_on(peer); |
e314dbdc | 1360 | } |
948d4f21 | 1361 | |
7a6102aa THJ |
1362 | veth_set_xdp_features(dev); |
1363 | ||
e314dbdc PE |
1364 | return 0; |
1365 | } | |
1366 | ||
2cf48a10 EB |
1367 | static int veth_close(struct net_device *dev) |
1368 | { | |
5e8d3dc7 | 1369 | struct veth_priv *priv = netdev_priv(dev); |
2efd32ee | 1370 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
1371 | |
1372 | netif_carrier_off(dev); | |
5e8d3dc7 HQ |
1373 | if (peer) |
1374 | netif_carrier_off(peer); | |
2cf48a10 | 1375 | |
5e8d3dc7 | 1376 | if (priv->_xdp_prog) |
948d4f21 | 1377 | veth_disable_xdp(dev); |
5e8d3dc7 | 1378 | else if (veth_gro_requested(dev)) |
d3256efd | 1379 | veth_napi_del(dev); |
948d4f21 | 1380 | |
2cf48a10 EB |
1381 | return 0; |
1382 | } | |
1383 | ||
91572088 | 1384 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 1385 | { |
91572088 | 1386 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
1387 | } |
1388 | ||
7797b93b TM |
1389 | static int veth_alloc_queues(struct net_device *dev) |
1390 | { | |
1391 | struct veth_priv *priv = netdev_priv(dev); | |
1392 | int i; | |
1393 | ||
1ce7d306 JK |
1394 | priv->rq = kvcalloc(dev->num_rx_queues, sizeof(*priv->rq), |
1395 | GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); | |
7797b93b TM |
1396 | if (!priv->rq) |
1397 | return -ENOMEM; | |
1398 | ||
4195e54a | 1399 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 1400 | priv->rq[i].dev = dev; |
4195e54a TM |
1401 | u64_stats_init(&priv->rq[i].stats.syncp); |
1402 | } | |
7797b93b TM |
1403 | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static void veth_free_queues(struct net_device *dev) | |
1408 | { | |
1409 | struct veth_priv *priv = netdev_priv(dev); | |
1410 | ||
1ce7d306 | 1411 | kvfree(priv->rq); |
7797b93b TM |
1412 | } |
1413 | ||
e314dbdc PE |
1414 | static int veth_dev_init(struct net_device *dev) |
1415 | { | |
0bef5120 | 1416 | netdev_lockdep_set_classes(dev); |
34d21de9 | 1417 | return veth_alloc_queues(dev); |
e314dbdc PE |
1418 | } |
1419 | ||
11687a10 DM |
1420 | static void veth_dev_free(struct net_device *dev) |
1421 | { | |
7797b93b | 1422 | veth_free_queues(dev); |
11687a10 DM |
1423 | } |
1424 | ||
bb446c19 WC |
1425 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1426 | static void veth_poll_controller(struct net_device *dev) | |
1427 | { | |
1428 | /* veth only receives frames when its peer sends one | |
948d4f21 | 1429 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
1430 | * never to have pending data when we poll for it so |
1431 | * there is nothing to do here. | |
1432 | * | |
1433 | * We need this though so netpoll recognizes us as an interface that | |
1434 | * supports polling, which enables bridge devices in virt setups to | |
1435 | * still use netconsole | |
1436 | */ | |
1437 | } | |
1438 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
1439 | ||
a45253bf ND |
1440 | static int veth_get_iflink(const struct net_device *dev) |
1441 | { | |
1442 | struct veth_priv *priv = netdev_priv(dev); | |
1443 | struct net_device *peer; | |
1444 | int iflink; | |
1445 | ||
1446 | rcu_read_lock(); | |
1447 | peer = rcu_dereference(priv->peer); | |
e353ea9c | 1448 | iflink = peer ? READ_ONCE(peer->ifindex) : 0; |
a45253bf ND |
1449 | rcu_read_unlock(); |
1450 | ||
1451 | return iflink; | |
1452 | } | |
1453 | ||
dc224822 TM |
1454 | static netdev_features_t veth_fix_features(struct net_device *dev, |
1455 | netdev_features_t features) | |
1456 | { | |
1457 | struct veth_priv *priv = netdev_priv(dev); | |
1458 | struct net_device *peer; | |
1459 | ||
1460 | peer = rtnl_dereference(priv->peer); | |
1461 | if (peer) { | |
1462 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1463 | ||
1464 | if (peer_priv->_xdp_prog) | |
1465 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1466 | } | |
1467 | ||
1468 | return features; | |
1469 | } | |
1470 | ||
d3256efd PA |
1471 | static int veth_set_features(struct net_device *dev, |
1472 | netdev_features_t features) | |
1473 | { | |
1474 | netdev_features_t changed = features ^ dev->features; | |
1475 | struct veth_priv *priv = netdev_priv(dev); | |
8267fc71 | 1476 | struct net_device *peer; |
d3256efd PA |
1477 | int err; |
1478 | ||
1479 | if (!(changed & NETIF_F_GRO) || !(dev->flags & IFF_UP) || priv->_xdp_prog) | |
1480 | return 0; | |
1481 | ||
8267fc71 | 1482 | peer = rtnl_dereference(priv->peer); |
d3256efd | 1483 | if (features & NETIF_F_GRO) { |
5e8d3dc7 HQ |
1484 | err = veth_napi_enable(dev); |
1485 | if (err) | |
1486 | return err; | |
fccca038 | 1487 | |
8267fc71 LB |
1488 | if (peer) |
1489 | xdp_features_set_redirect_target(peer, true); | |
d3256efd | 1490 | } else { |
8267fc71 LB |
1491 | if (peer) |
1492 | xdp_features_clear_redirect_target(peer); | |
5e8d3dc7 | 1493 | veth_napi_del(dev); |
d3256efd PA |
1494 | } |
1495 | return 0; | |
1496 | } | |
1497 | ||
163e5292 PA |
1498 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1499 | { | |
1500 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1501 | struct net_device *peer; | |
1502 | ||
1503 | if (new_hr < 0) | |
1504 | new_hr = 0; | |
1505 | ||
1506 | rcu_read_lock(); | |
1507 | peer = rcu_dereference(priv->peer); | |
1508 | if (unlikely(!peer)) | |
1509 | goto out; | |
1510 | ||
1511 | peer_priv = netdev_priv(peer); | |
1512 | priv->requested_headroom = new_hr; | |
1513 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1514 | dev->needed_headroom = new_hr; | |
1515 | peer->needed_headroom = new_hr; | |
1516 | ||
1517 | out: | |
1518 | rcu_read_unlock(); | |
1519 | } | |
1520 | ||
948d4f21 TM |
1521 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1522 | struct netlink_ext_ack *extack) | |
1523 | { | |
1524 | struct veth_priv *priv = netdev_priv(dev); | |
1525 | struct bpf_prog *old_prog; | |
1526 | struct net_device *peer; | |
dc224822 | 1527 | unsigned int max_mtu; |
948d4f21 TM |
1528 | int err; |
1529 | ||
1530 | old_prog = priv->_xdp_prog; | |
1531 | priv->_xdp_prog = prog; | |
1532 | peer = rtnl_dereference(priv->peer); | |
1533 | ||
1534 | if (prog) { | |
1535 | if (!peer) { | |
1536 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1537 | err = -ENOTCONN; | |
1538 | goto err; | |
1539 | } | |
1540 | ||
7cda76d8 LB |
1541 | max_mtu = SKB_WITH_OVERHEAD(PAGE_SIZE - VETH_XDP_HEADROOM) - |
1542 | peer->hard_header_len; | |
1543 | /* Allow increasing the max_mtu if the program supports | |
1544 | * XDP fragments. | |
1545 | */ | |
1546 | if (prog->aux->xdp_has_frags) | |
1547 | max_mtu += PAGE_SIZE * MAX_SKB_FRAGS; | |
1548 | ||
dc224822 TM |
1549 | if (peer->mtu > max_mtu) { |
1550 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1551 | err = -ERANGE; | |
1552 | goto err; | |
1553 | } | |
1554 | ||
638264dc TM |
1555 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1556 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1557 | err = -ENOSPC; | |
1558 | goto err; | |
1559 | } | |
1560 | ||
948d4f21 TM |
1561 | if (dev->flags & IFF_UP) { |
1562 | err = veth_enable_xdp(dev); | |
1563 | if (err) { | |
1564 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1565 | goto err; | |
1566 | } | |
1567 | } | |
dc224822 TM |
1568 | |
1569 | if (!old_prog) { | |
1570 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1571 | peer->max_mtu = max_mtu; | |
1572 | } | |
fccca038 | 1573 | |
8267fc71 | 1574 | xdp_features_set_redirect_target(peer, true); |
948d4f21 TM |
1575 | } |
1576 | ||
1577 | if (old_prog) { | |
dc224822 | 1578 | if (!prog) { |
8267fc71 LB |
1579 | if (peer && !veth_gro_requested(dev)) |
1580 | xdp_features_clear_redirect_target(peer); | |
fccca038 | 1581 | |
dc224822 TM |
1582 | if (dev->flags & IFF_UP) |
1583 | veth_disable_xdp(dev); | |
1584 | ||
1585 | if (peer) { | |
1586 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1587 | peer->max_mtu = ETH_MAX_MTU; | |
1588 | } | |
1589 | } | |
948d4f21 TM |
1590 | bpf_prog_put(old_prog); |
1591 | } | |
1592 | ||
dc224822 TM |
1593 | if ((!!old_prog ^ !!prog) && peer) |
1594 | netdev_update_features(peer); | |
1595 | ||
948d4f21 TM |
1596 | return 0; |
1597 | err: | |
1598 | priv->_xdp_prog = old_prog; | |
1599 | ||
1600 | return err; | |
1601 | } | |
1602 | ||
948d4f21 TM |
1603 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
1604 | { | |
1605 | switch (xdp->command) { | |
1606 | case XDP_SETUP_PROG: | |
1607 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
948d4f21 TM |
1608 | default: |
1609 | return -EINVAL; | |
1610 | } | |
1611 | } | |
1612 | ||
306531f0 SF |
1613 | static int veth_xdp_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp) |
1614 | { | |
1615 | struct veth_xdp_buff *_ctx = (void *)ctx; | |
1616 | ||
1617 | if (!_ctx->skb) | |
915efd8a | 1618 | return -ENODATA; |
306531f0 SF |
1619 | |
1620 | *timestamp = skb_hwtstamps(_ctx->skb)->hwtstamp; | |
1621 | return 0; | |
1622 | } | |
1623 | ||
0cd917a4 JDB |
1624 | static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash, |
1625 | enum xdp_rss_hash_type *rss_type) | |
306531f0 SF |
1626 | { |
1627 | struct veth_xdp_buff *_ctx = (void *)ctx; | |
96b1a098 | 1628 | struct sk_buff *skb = _ctx->skb; |
306531f0 | 1629 | |
96b1a098 | 1630 | if (!skb) |
915efd8a | 1631 | return -ENODATA; |
306531f0 | 1632 | |
96b1a098 JDB |
1633 | *hash = skb_get_hash(skb); |
1634 | *rss_type = skb->l4_hash ? XDP_RSS_TYPE_L4_ANY : XDP_RSS_TYPE_NONE; | |
1635 | ||
306531f0 SF |
1636 | return 0; |
1637 | } | |
1638 | ||
fca78379 LZ |
1639 | static int veth_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto, |
1640 | u16 *vlan_tci) | |
1641 | { | |
1642 | const struct veth_xdp_buff *_ctx = (void *)ctx; | |
1643 | const struct sk_buff *skb = _ctx->skb; | |
1644 | int err; | |
1645 | ||
1646 | if (!skb) | |
1647 | return -ENODATA; | |
1648 | ||
1649 | err = __vlan_hwaccel_get_tag(skb, vlan_tci); | |
1650 | if (err) | |
1651 | return err; | |
1652 | ||
1653 | *vlan_proto = skb->vlan_proto; | |
1654 | return err; | |
1655 | } | |
1656 | ||
4456e7bd | 1657 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1658 | .ndo_init = veth_dev_init, |
1659 | .ndo_open = veth_open, | |
2cf48a10 | 1660 | .ndo_stop = veth_close, |
ee923623 | 1661 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1662 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1663 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1664 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1665 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1666 | .ndo_poll_controller = veth_poll_controller, | |
1667 | #endif | |
a45253bf | 1668 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1669 | .ndo_fix_features = veth_fix_features, |
d3256efd | 1670 | .ndo_set_features = veth_set_features, |
1a04a821 | 1671 | .ndo_features_check = passthru_features_check, |
163e5292 | 1672 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1673 | .ndo_bpf = veth_xdp, |
9152cff0 | 1674 | .ndo_xdp_xmit = veth_ndo_xdp_xmit, |
9aa1206e | 1675 | .ndo_get_peer_dev = veth_peer_dev, |
4456e7bd SH |
1676 | }; |
1677 | ||
306531f0 SF |
1678 | static const struct xdp_metadata_ops veth_xdp_metadata_ops = { |
1679 | .xmo_rx_timestamp = veth_xdp_rx_timestamp, | |
1680 | .xmo_rx_hash = veth_xdp_rx_hash, | |
fca78379 | 1681 | .xmo_rx_vlan_tag = veth_xdp_rx_vlan_tag, |
306531f0 SF |
1682 | }; |
1683 | ||
732912d7 | 1684 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1685 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1686 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1687 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1688 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1689 | |
e314dbdc PE |
1690 | static void veth_setup(struct net_device *dev) |
1691 | { | |
1692 | ether_setup(dev); | |
1693 | ||
550fd08c | 1694 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1695 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1696 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1697 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1698 | |
4456e7bd | 1699 | dev->netdev_ops = &veth_netdev_ops; |
306531f0 | 1700 | dev->xdp_metadata_ops = &veth_xdp_metadata_ops; |
e314dbdc PE |
1701 | dev->ethtool_ops = &veth_ethtool_ops; |
1702 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1703 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1704 | dev->vlan_features = dev->features & |
3f8c707b VY |
1705 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1706 | NETIF_F_HW_VLAN_STAG_TX | | |
1707 | NETIF_F_HW_VLAN_CTAG_RX | | |
1708 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1709 | dev->needs_free_netdev = true; |
1710 | dev->priv_destructor = veth_dev_free; | |
6f2684bf | 1711 | dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; |
91572088 | 1712 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1713 | |
8093315a | 1714 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1715 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1716 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
d406099d | 1717 | netif_set_tso_max_size(dev, GSO_MAX_SIZE); |
e314dbdc PE |
1718 | } |
1719 | ||
1720 | /* | |
1721 | * netlink interface | |
1722 | */ | |
1723 | ||
a8b8a889 MS |
1724 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1725 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1726 | { |
1727 | if (tb[IFLA_ADDRESS]) { | |
1728 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1729 | return -EINVAL; | |
1730 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1731 | return -EADDRNOTAVAIL; | |
1732 | } | |
38d40815 EB |
1733 | if (tb[IFLA_MTU]) { |
1734 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1735 | return -EINVAL; | |
1736 | } | |
e314dbdc PE |
1737 | return 0; |
1738 | } | |
1739 | ||
1740 | static struct rtnl_link_ops veth_link_ops; | |
1741 | ||
d3256efd PA |
1742 | static void veth_disable_gro(struct net_device *dev) |
1743 | { | |
1744 | dev->features &= ~NETIF_F_GRO; | |
1745 | dev->wanted_features &= ~NETIF_F_GRO; | |
1746 | netdev_update_features(dev); | |
1747 | } | |
1748 | ||
9d3684c2 PA |
1749 | static int veth_init_queues(struct net_device *dev, struct nlattr *tb[]) |
1750 | { | |
1751 | int err; | |
1752 | ||
1753 | if (!tb[IFLA_NUM_TX_QUEUES] && dev->num_tx_queues > 1) { | |
1754 | err = netif_set_real_num_tx_queues(dev, 1); | |
1755 | if (err) | |
1756 | return err; | |
1757 | } | |
1758 | if (!tb[IFLA_NUM_RX_QUEUES] && dev->num_rx_queues > 1) { | |
1759 | err = netif_set_real_num_rx_queues(dev, 1); | |
1760 | if (err) | |
1761 | return err; | |
1762 | } | |
1763 | return 0; | |
1764 | } | |
1765 | ||
81adee47 | 1766 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1767 | struct nlattr *tb[], struct nlattr *data[], |
1768 | struct netlink_ext_ack *extack) | |
e314dbdc | 1769 | { |
7797b93b | 1770 | int err; |
e314dbdc PE |
1771 | struct net_device *peer; |
1772 | struct veth_priv *priv; | |
1773 | char ifname[IFNAMSIZ]; | |
1774 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1775 | unsigned char name_assign_type; |
3729d502 | 1776 | struct ifinfomsg *ifmp; |
81adee47 | 1777 | struct net *net; |
e314dbdc PE |
1778 | |
1779 | /* | |
1780 | * create and register peer first | |
e314dbdc | 1781 | */ |
e314dbdc PE |
1782 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1783 | struct nlattr *nla_peer; | |
1784 | ||
1785 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1786 | ifmp = nla_data(nla_peer); |
f534f658 | 1787 | err = rtnl_nla_parse_ifinfomsg(peer_tb, nla_peer, extack); |
e314dbdc PE |
1788 | if (err < 0) |
1789 | return err; | |
1790 | ||
a8b8a889 | 1791 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1792 | if (err < 0) |
1793 | return err; | |
1794 | ||
1795 | tbp = peer_tb; | |
3729d502 PM |
1796 | } else { |
1797 | ifmp = NULL; | |
e314dbdc | 1798 | tbp = tb; |
3729d502 | 1799 | } |
e314dbdc | 1800 | |
191cdb38 | 1801 | if (ifmp && tbp[IFLA_IFNAME]) { |
872f6903 | 1802 | nla_strscpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1803 | name_assign_type = NET_NAME_USER; |
1804 | } else { | |
e314dbdc | 1805 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1806 | name_assign_type = NET_NAME_ENUM; |
1807 | } | |
e314dbdc | 1808 | |
81adee47 EB |
1809 | net = rtnl_link_get_net(src_net, tbp); |
1810 | if (IS_ERR(net)) | |
1811 | return PTR_ERR(net); | |
1812 | ||
5517750f | 1813 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1814 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1815 | if (IS_ERR(peer)) { |
1816 | put_net(net); | |
e314dbdc | 1817 | return PTR_ERR(peer); |
81adee47 | 1818 | } |
e314dbdc | 1819 | |
191cdb38 | 1820 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1821 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1822 | |
1823 | if (ifmp && (dev->ifindex != 0)) | |
1824 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1825 | |
6df6398f | 1826 | netif_inherit_tso_max(peer, dev); |
72d24955 | 1827 | |
e314dbdc | 1828 | err = register_netdevice(peer); |
81adee47 EB |
1829 | put_net(net); |
1830 | net = NULL; | |
e314dbdc PE |
1831 | if (err < 0) |
1832 | goto err_register_peer; | |
1833 | ||
d3256efd PA |
1834 | /* keep GRO disabled by default to be consistent with the established |
1835 | * veth behavior | |
1836 | */ | |
1837 | veth_disable_gro(peer); | |
e314dbdc PE |
1838 | netif_carrier_off(peer); |
1839 | ||
1d997f10 | 1840 | err = rtnl_configure_link(peer, ifmp, 0, NULL); |
3729d502 PM |
1841 | if (err < 0) |
1842 | goto err_configure_peer; | |
1843 | ||
e314dbdc PE |
1844 | /* |
1845 | * register dev last | |
1846 | * | |
1847 | * note, that since we've registered new device the dev's name | |
1848 | * should be re-allocated | |
1849 | */ | |
1850 | ||
1851 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1852 | eth_hw_addr_random(dev); |
e314dbdc | 1853 | |
6c8c4446 | 1854 | if (tb[IFLA_IFNAME]) |
872f6903 | 1855 | nla_strscpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); |
6c8c4446 JP |
1856 | else |
1857 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1858 | ||
e314dbdc PE |
1859 | err = register_netdevice(dev); |
1860 | if (err < 0) | |
1861 | goto err_register_dev; | |
1862 | ||
1863 | netif_carrier_off(dev); | |
1864 | ||
1865 | /* | |
1866 | * tie the deviced together | |
1867 | */ | |
1868 | ||
1869 | priv = netdev_priv(dev); | |
d0e2c55e | 1870 | rcu_assign_pointer(priv->peer, peer); |
9d3684c2 PA |
1871 | err = veth_init_queues(dev, tb); |
1872 | if (err) | |
1873 | goto err_queues; | |
e314dbdc PE |
1874 | |
1875 | priv = netdev_priv(peer); | |
d0e2c55e | 1876 | rcu_assign_pointer(priv->peer, dev); |
9d3684c2 PA |
1877 | err = veth_init_queues(peer, tb); |
1878 | if (err) | |
1879 | goto err_queues; | |
948d4f21 | 1880 | |
d3256efd | 1881 | veth_disable_gro(dev); |
fccca038 LB |
1882 | /* update XDP supported features */ |
1883 | veth_set_xdp_features(dev); | |
1884 | veth_set_xdp_features(peer); | |
1885 | ||
e314dbdc PE |
1886 | return 0; |
1887 | ||
9d3684c2 PA |
1888 | err_queues: |
1889 | unregister_netdevice(dev); | |
e314dbdc PE |
1890 | err_register_dev: |
1891 | /* nothing to do */ | |
3729d502 | 1892 | err_configure_peer: |
e314dbdc PE |
1893 | unregister_netdevice(peer); |
1894 | return err; | |
1895 | ||
1896 | err_register_peer: | |
1897 | free_netdev(peer); | |
1898 | return err; | |
1899 | } | |
1900 | ||
23289a37 | 1901 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1902 | { |
1903 | struct veth_priv *priv; | |
1904 | struct net_device *peer; | |
1905 | ||
1906 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1907 | peer = rtnl_dereference(priv->peer); |
1908 | ||
1909 | /* Note : dellink() is called from default_device_exit_batch(), | |
1910 | * before a rcu_synchronize() point. The devices are guaranteed | |
1911 | * not being freed before one RCU grace period. | |
1912 | */ | |
1913 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1914 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1915 | |
1916 | if (peer) { | |
1917 | priv = netdev_priv(peer); | |
1918 | RCU_INIT_POINTER(priv->peer, NULL); | |
1919 | unregister_netdevice_queue(peer, head); | |
1920 | } | |
e314dbdc PE |
1921 | } |
1922 | ||
23711438 TG |
1923 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
1924 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
1925 | }; | |
e314dbdc | 1926 | |
e5f4e7b9 ND |
1927 | static struct net *veth_get_link_net(const struct net_device *dev) |
1928 | { | |
1929 | struct veth_priv *priv = netdev_priv(dev); | |
1930 | struct net_device *peer = rtnl_dereference(priv->peer); | |
1931 | ||
1932 | return peer ? dev_net(peer) : dev_net(dev); | |
1933 | } | |
1934 | ||
9d3684c2 PA |
1935 | static unsigned int veth_get_num_queues(void) |
1936 | { | |
1937 | /* enforce the same queue limit as rtnl_create_link */ | |
1938 | int queues = num_possible_cpus(); | |
1939 | ||
1940 | if (queues > 4096) | |
1941 | queues = 4096; | |
1942 | return queues; | |
1943 | } | |
1944 | ||
e314dbdc PE |
1945 | static struct rtnl_link_ops veth_link_ops = { |
1946 | .kind = DRV_NAME, | |
1947 | .priv_size = sizeof(struct veth_priv), | |
1948 | .setup = veth_setup, | |
1949 | .validate = veth_validate, | |
1950 | .newlink = veth_newlink, | |
1951 | .dellink = veth_dellink, | |
1952 | .policy = veth_policy, | |
1953 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 1954 | .get_link_net = veth_get_link_net, |
9d3684c2 PA |
1955 | .get_num_tx_queues = veth_get_num_queues, |
1956 | .get_num_rx_queues = veth_get_num_queues, | |
e314dbdc PE |
1957 | }; |
1958 | ||
1959 | /* | |
1960 | * init/fini | |
1961 | */ | |
1962 | ||
1963 | static __init int veth_init(void) | |
1964 | { | |
1965 | return rtnl_link_register(&veth_link_ops); | |
1966 | } | |
1967 | ||
1968 | static __exit void veth_exit(void) | |
1969 | { | |
68365458 | 1970 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
1971 | } |
1972 | ||
1973 | module_init(veth_init); | |
1974 | module_exit(veth_exit); | |
1975 | ||
1976 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
1977 | MODULE_LICENSE("GPL v2"); | |
1978 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |