Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e314dbdc PE |
2 | /* |
3 | * drivers/net/veth.c | |
4 | * | |
5 | * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc | |
6 | * | |
7 | * Author: Pavel Emelianov <xemul@openvz.org> | |
8 | * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> | |
9 | * | |
10 | */ | |
11 | ||
e314dbdc | 12 | #include <linux/netdevice.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
e314dbdc PE |
14 | #include <linux/ethtool.h> |
15 | #include <linux/etherdevice.h> | |
cf05c700 | 16 | #include <linux/u64_stats_sync.h> |
e314dbdc | 17 | |
f7b12606 | 18 | #include <net/rtnetlink.h> |
e314dbdc PE |
19 | #include <net/dst.h> |
20 | #include <net/xfrm.h> | |
af87a3aa | 21 | #include <net/xdp.h> |
ecef969e | 22 | #include <linux/veth.h> |
9d9779e7 | 23 | #include <linux/module.h> |
948d4f21 TM |
24 | #include <linux/bpf.h> |
25 | #include <linux/filter.h> | |
26 | #include <linux/ptr_ring.h> | |
948d4f21 | 27 | #include <linux/bpf_trace.h> |
aa4e689e | 28 | #include <linux/net_tstamp.h> |
e314dbdc PE |
29 | |
30 | #define DRV_NAME "veth" | |
31 | #define DRV_VERSION "1.0" | |
32 | ||
9fc8d518 | 33 | #define VETH_XDP_FLAG BIT(0) |
948d4f21 TM |
34 | #define VETH_RING_SIZE 256 |
35 | #define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN) | |
36 | ||
9cda7807 | 37 | #define VETH_XDP_TX_BULK_SIZE 16 |
65e6dcf7 | 38 | #define VETH_XDP_BATCH 16 |
9cda7807 | 39 | |
65780c56 | 40 | struct veth_stats { |
1c5b82e5 LB |
41 | u64 rx_drops; |
42 | /* xdp */ | |
65780c56 LB |
43 | u64 xdp_packets; |
44 | u64 xdp_bytes; | |
1c5b82e5 | 45 | u64 xdp_redirect; |
65780c56 | 46 | u64 xdp_drops; |
1c5b82e5 | 47 | u64 xdp_tx; |
9152cff0 | 48 | u64 xdp_tx_err; |
5fe6e567 LB |
49 | u64 peer_tq_xdp_xmit; |
50 | u64 peer_tq_xdp_xmit_err; | |
65780c56 LB |
51 | }; |
52 | ||
4195e54a | 53 | struct veth_rq_stats { |
65780c56 | 54 | struct veth_stats vs; |
4195e54a TM |
55 | struct u64_stats_sync syncp; |
56 | }; | |
57 | ||
638264dc | 58 | struct veth_rq { |
948d4f21 | 59 | struct napi_struct xdp_napi; |
d3256efd | 60 | struct napi_struct __rcu *napi; /* points to xdp_napi when the latter is initialized */ |
948d4f21 TM |
61 | struct net_device *dev; |
62 | struct bpf_prog __rcu *xdp_prog; | |
d1396004 | 63 | struct xdp_mem_info xdp_mem; |
4195e54a | 64 | struct veth_rq_stats stats; |
948d4f21 TM |
65 | bool rx_notify_masked; |
66 | struct ptr_ring xdp_ring; | |
67 | struct xdp_rxq_info xdp_rxq; | |
e314dbdc PE |
68 | }; |
69 | ||
638264dc TM |
70 | struct veth_priv { |
71 | struct net_device __rcu *peer; | |
72 | atomic64_t dropped; | |
73 | struct bpf_prog *_xdp_prog; | |
74 | struct veth_rq *rq; | |
75 | unsigned int requested_headroom; | |
76 | }; | |
77 | ||
9cda7807 TM |
78 | struct veth_xdp_tx_bq { |
79 | struct xdp_frame *q[VETH_XDP_TX_BULK_SIZE]; | |
80 | unsigned int count; | |
81 | }; | |
82 | ||
e314dbdc PE |
83 | /* |
84 | * ethtool interface | |
85 | */ | |
86 | ||
d397b968 TM |
87 | struct veth_q_stat_desc { |
88 | char desc[ETH_GSTRING_LEN]; | |
89 | size_t offset; | |
90 | }; | |
91 | ||
65780c56 | 92 | #define VETH_RQ_STAT(m) offsetof(struct veth_stats, m) |
d397b968 TM |
93 | |
94 | static const struct veth_q_stat_desc veth_rq_stats_desc[] = { | |
95 | { "xdp_packets", VETH_RQ_STAT(xdp_packets) }, | |
96 | { "xdp_bytes", VETH_RQ_STAT(xdp_bytes) }, | |
5fe6e567 LB |
97 | { "drops", VETH_RQ_STAT(rx_drops) }, |
98 | { "xdp_redirect", VETH_RQ_STAT(xdp_redirect) }, | |
99 | { "xdp_drops", VETH_RQ_STAT(xdp_drops) }, | |
100 | { "xdp_tx", VETH_RQ_STAT(xdp_tx) }, | |
101 | { "xdp_tx_errors", VETH_RQ_STAT(xdp_tx_err) }, | |
d397b968 TM |
102 | }; |
103 | ||
104 | #define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc) | |
105 | ||
5fe6e567 LB |
106 | static const struct veth_q_stat_desc veth_tq_stats_desc[] = { |
107 | { "xdp_xmit", VETH_RQ_STAT(peer_tq_xdp_xmit) }, | |
108 | { "xdp_xmit_errors", VETH_RQ_STAT(peer_tq_xdp_xmit_err) }, | |
109 | }; | |
110 | ||
111 | #define VETH_TQ_STATS_LEN ARRAY_SIZE(veth_tq_stats_desc) | |
112 | ||
e314dbdc PE |
113 | static struct { |
114 | const char string[ETH_GSTRING_LEN]; | |
115 | } ethtool_stats_keys[] = { | |
116 | { "peer_ifindex" }, | |
117 | }; | |
118 | ||
56607b98 PR |
119 | static int veth_get_link_ksettings(struct net_device *dev, |
120 | struct ethtool_link_ksettings *cmd) | |
e314dbdc | 121 | { |
56607b98 PR |
122 | cmd->base.speed = SPEED_10000; |
123 | cmd->base.duplex = DUPLEX_FULL; | |
124 | cmd->base.port = PORT_TP; | |
125 | cmd->base.autoneg = AUTONEG_DISABLE; | |
e314dbdc PE |
126 | return 0; |
127 | } | |
128 | ||
129 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
130 | { | |
33a5ba14 RJ |
131 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
132 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
e314dbdc PE |
133 | } |
134 | ||
135 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) | |
136 | { | |
d397b968 TM |
137 | char *p = (char *)buf; |
138 | int i, j; | |
139 | ||
e314dbdc PE |
140 | switch(stringset) { |
141 | case ETH_SS_STATS: | |
d397b968 TM |
142 | memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
143 | p += sizeof(ethtool_stats_keys); | |
144 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
145 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
abdf47aa | 146 | snprintf(p, ETH_GSTRING_LEN, |
9152cff0 | 147 | "rx_queue_%u_%.18s", |
d397b968 TM |
148 | i, veth_rq_stats_desc[j].desc); |
149 | p += ETH_GSTRING_LEN; | |
150 | } | |
151 | } | |
5fe6e567 LB |
152 | for (i = 0; i < dev->real_num_tx_queues; i++) { |
153 | for (j = 0; j < VETH_TQ_STATS_LEN; j++) { | |
154 | snprintf(p, ETH_GSTRING_LEN, | |
155 | "tx_queue_%u_%.18s", | |
156 | i, veth_tq_stats_desc[j].desc); | |
157 | p += ETH_GSTRING_LEN; | |
158 | } | |
159 | } | |
e314dbdc PE |
160 | break; |
161 | } | |
162 | } | |
163 | ||
b9f2c044 | 164 | static int veth_get_sset_count(struct net_device *dev, int sset) |
e314dbdc | 165 | { |
b9f2c044 JG |
166 | switch (sset) { |
167 | case ETH_SS_STATS: | |
d397b968 | 168 | return ARRAY_SIZE(ethtool_stats_keys) + |
5fe6e567 LB |
169 | VETH_RQ_STATS_LEN * dev->real_num_rx_queues + |
170 | VETH_TQ_STATS_LEN * dev->real_num_tx_queues; | |
b9f2c044 JG |
171 | default: |
172 | return -EOPNOTSUPP; | |
173 | } | |
e314dbdc PE |
174 | } |
175 | ||
176 | static void veth_get_ethtool_stats(struct net_device *dev, | |
177 | struct ethtool_stats *stats, u64 *data) | |
178 | { | |
5fe6e567 | 179 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); |
d0e2c55e | 180 | struct net_device *peer = rtnl_dereference(priv->peer); |
d397b968 | 181 | int i, j, idx; |
e314dbdc | 182 | |
d0e2c55e | 183 | data[0] = peer ? peer->ifindex : 0; |
d397b968 TM |
184 | idx = 1; |
185 | for (i = 0; i < dev->real_num_rx_queues; i++) { | |
186 | const struct veth_rq_stats *rq_stats = &priv->rq[i].stats; | |
65780c56 | 187 | const void *stats_base = (void *)&rq_stats->vs; |
d397b968 TM |
188 | unsigned int start; |
189 | size_t offset; | |
190 | ||
191 | do { | |
192 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
193 | for (j = 0; j < VETH_RQ_STATS_LEN; j++) { | |
194 | offset = veth_rq_stats_desc[j].offset; | |
195 | data[idx + j] = *(u64 *)(stats_base + offset); | |
196 | } | |
197 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
198 | idx += VETH_RQ_STATS_LEN; | |
199 | } | |
5fe6e567 LB |
200 | |
201 | if (!peer) | |
202 | return; | |
203 | ||
204 | rcv_priv = netdev_priv(peer); | |
205 | for (i = 0; i < peer->real_num_rx_queues; i++) { | |
206 | const struct veth_rq_stats *rq_stats = &rcv_priv->rq[i].stats; | |
207 | const void *base = (void *)&rq_stats->vs; | |
208 | unsigned int start, tx_idx = idx; | |
209 | size_t offset; | |
210 | ||
211 | tx_idx += (i % dev->real_num_tx_queues) * VETH_TQ_STATS_LEN; | |
212 | do { | |
213 | start = u64_stats_fetch_begin_irq(&rq_stats->syncp); | |
214 | for (j = 0; j < VETH_TQ_STATS_LEN; j++) { | |
215 | offset = veth_tq_stats_desc[j].offset; | |
216 | data[tx_idx + j] += *(u64 *)(base + offset); | |
217 | } | |
218 | } while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start)); | |
219 | } | |
e314dbdc PE |
220 | } |
221 | ||
34829eec MF |
222 | static void veth_get_channels(struct net_device *dev, |
223 | struct ethtool_channels *channels) | |
224 | { | |
225 | channels->tx_count = dev->real_num_tx_queues; | |
226 | channels->rx_count = dev->real_num_rx_queues; | |
4752eeb3 PA |
227 | channels->max_tx = dev->num_tx_queues; |
228 | channels->max_rx = dev->num_rx_queues; | |
34829eec MF |
229 | } |
230 | ||
4752eeb3 PA |
231 | static int veth_set_channels(struct net_device *dev, |
232 | struct ethtool_channels *ch); | |
233 | ||
0fc0b732 | 234 | static const struct ethtool_ops veth_ethtool_ops = { |
e314dbdc PE |
235 | .get_drvinfo = veth_get_drvinfo, |
236 | .get_link = ethtool_op_get_link, | |
e314dbdc | 237 | .get_strings = veth_get_strings, |
b9f2c044 | 238 | .get_sset_count = veth_get_sset_count, |
e314dbdc | 239 | .get_ethtool_stats = veth_get_ethtool_stats, |
56607b98 | 240 | .get_link_ksettings = veth_get_link_ksettings, |
056b21fb | 241 | .get_ts_info = ethtool_op_get_ts_info, |
34829eec | 242 | .get_channels = veth_get_channels, |
4752eeb3 | 243 | .set_channels = veth_set_channels, |
e314dbdc PE |
244 | }; |
245 | ||
948d4f21 TM |
246 | /* general routines */ |
247 | ||
9fc8d518 TM |
248 | static bool veth_is_xdp_frame(void *ptr) |
249 | { | |
250 | return (unsigned long)ptr & VETH_XDP_FLAG; | |
251 | } | |
252 | ||
defcffeb | 253 | static struct xdp_frame *veth_ptr_to_xdp(void *ptr) |
9fc8d518 TM |
254 | { |
255 | return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG); | |
256 | } | |
257 | ||
defcffeb | 258 | static void *veth_xdp_to_ptr(struct xdp_frame *xdp) |
af87a3aa | 259 | { |
defcffeb | 260 | return (void *)((unsigned long)xdp | VETH_XDP_FLAG); |
af87a3aa TM |
261 | } |
262 | ||
9fc8d518 TM |
263 | static void veth_ptr_free(void *ptr) |
264 | { | |
265 | if (veth_is_xdp_frame(ptr)) | |
266 | xdp_return_frame(veth_ptr_to_xdp(ptr)); | |
267 | else | |
268 | kfree_skb(ptr); | |
269 | } | |
270 | ||
638264dc | 271 | static void __veth_xdp_flush(struct veth_rq *rq) |
948d4f21 TM |
272 | { |
273 | /* Write ptr_ring before reading rx_notify_masked */ | |
274 | smp_mb(); | |
638264dc TM |
275 | if (!rq->rx_notify_masked) { |
276 | rq->rx_notify_masked = true; | |
277 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
278 | } |
279 | } | |
280 | ||
638264dc | 281 | static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb) |
948d4f21 | 282 | { |
638264dc | 283 | if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) { |
948d4f21 TM |
284 | dev_kfree_skb_any(skb); |
285 | return NET_RX_DROP; | |
286 | } | |
287 | ||
288 | return NET_RX_SUCCESS; | |
289 | } | |
290 | ||
638264dc TM |
291 | static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, |
292 | struct veth_rq *rq, bool xdp) | |
e314dbdc | 293 | { |
948d4f21 | 294 | return __dev_forward_skb(dev, skb) ?: xdp ? |
638264dc | 295 | veth_xdp_rx(rq, skb) : |
948d4f21 TM |
296 | netif_rx(skb); |
297 | } | |
298 | ||
47e550e0 PA |
299 | /* return true if the specified skb has chances of GRO aggregation |
300 | * Don't strive for accuracy, but try to avoid GRO overhead in the most | |
301 | * common scenarios. | |
302 | * When XDP is enabled, all traffic is considered eligible, as the xmit | |
303 | * device has TSO off. | |
304 | * When TSO is enabled on the xmit device, we are likely interested only | |
305 | * in UDP aggregation, explicitly check for that if the skb is suspected | |
306 | * - the sock_wfree destructor is used by UDP, ICMP and XDP sockets - | |
307 | * to belong to locally generated UDP traffic. | |
308 | */ | |
309 | static bool veth_skb_is_eligible_for_gro(const struct net_device *dev, | |
310 | const struct net_device *rcv, | |
311 | const struct sk_buff *skb) | |
312 | { | |
313 | return !(dev->features & NETIF_F_ALL_TSO) || | |
314 | (skb->destructor == sock_wfree && | |
315 | rcv->features & (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP_FWD)); | |
316 | } | |
317 | ||
948d4f21 TM |
318 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
319 | { | |
320 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
638264dc | 321 | struct veth_rq *rq = NULL; |
d0e2c55e | 322 | struct net_device *rcv; |
2681128f | 323 | int length = skb->len; |
d3256efd | 324 | bool use_napi = false; |
638264dc | 325 | int rxq; |
e314dbdc | 326 | |
d0e2c55e ED |
327 | rcu_read_lock(); |
328 | rcv = rcu_dereference(priv->peer); | |
329 | if (unlikely(!rcv)) { | |
330 | kfree_skb(skb); | |
331 | goto drop; | |
332 | } | |
e314dbdc | 333 | |
948d4f21 | 334 | rcv_priv = netdev_priv(rcv); |
638264dc TM |
335 | rxq = skb_get_queue_mapping(skb); |
336 | if (rxq < rcv->real_num_rx_queues) { | |
337 | rq = &rcv_priv->rq[rxq]; | |
d3256efd PA |
338 | |
339 | /* The napi pointer is available when an XDP program is | |
340 | * attached or when GRO is enabled | |
47e550e0 | 341 | * Don't bother with napi/GRO if the skb can't be aggregated |
d3256efd | 342 | */ |
47e550e0 PA |
343 | use_napi = rcu_access_pointer(rq->napi) && |
344 | veth_skb_is_eligible_for_gro(dev, rcv, skb); | |
edbea922 | 345 | skb_record_rx_queue(skb, rxq); |
638264dc | 346 | } |
948d4f21 | 347 | |
aa4e689e | 348 | skb_tx_timestamp(skb); |
d3256efd PA |
349 | if (likely(veth_forward_skb(rcv, skb, rq, use_napi) == NET_RX_SUCCESS)) { |
350 | if (!use_napi) | |
b4fba476 | 351 | dev_lstats_add(dev, length); |
2681128f | 352 | } else { |
d0e2c55e | 353 | drop: |
2681128f ED |
354 | atomic64_inc(&priv->dropped); |
355 | } | |
948d4f21 | 356 | |
d3256efd | 357 | if (use_napi) |
638264dc | 358 | __veth_xdp_flush(rq); |
948d4f21 | 359 | |
d0e2c55e | 360 | rcu_read_unlock(); |
948d4f21 | 361 | |
6ed10654 | 362 | return NETDEV_TX_OK; |
e314dbdc PE |
363 | } |
364 | ||
b4fba476 | 365 | static u64 veth_stats_tx(struct net_device *dev, u64 *packets, u64 *bytes) |
e314dbdc | 366 | { |
cf05c700 | 367 | struct veth_priv *priv = netdev_priv(dev); |
cf05c700 | 368 | |
b4fba476 | 369 | dev_lstats_read(dev, packets, bytes); |
2681128f ED |
370 | return atomic64_read(&priv->dropped); |
371 | } | |
372 | ||
65780c56 | 373 | static void veth_stats_rx(struct veth_stats *result, struct net_device *dev) |
4195e54a TM |
374 | { |
375 | struct veth_priv *priv = netdev_priv(dev); | |
376 | int i; | |
377 | ||
5fe6e567 | 378 | result->peer_tq_xdp_xmit_err = 0; |
4195e54a | 379 | result->xdp_packets = 0; |
d99a7c2f | 380 | result->xdp_tx_err = 0; |
4195e54a | 381 | result->xdp_bytes = 0; |
66fe4a07 | 382 | result->rx_drops = 0; |
4195e54a | 383 | for (i = 0; i < dev->num_rx_queues; i++) { |
5fe6e567 | 384 | u64 packets, bytes, drops, xdp_tx_err, peer_tq_xdp_xmit_err; |
4195e54a | 385 | struct veth_rq_stats *stats = &priv->rq[i].stats; |
4195e54a TM |
386 | unsigned int start; |
387 | ||
388 | do { | |
389 | start = u64_stats_fetch_begin_irq(&stats->syncp); | |
5fe6e567 | 390 | peer_tq_xdp_xmit_err = stats->vs.peer_tq_xdp_xmit_err; |
d99a7c2f | 391 | xdp_tx_err = stats->vs.xdp_tx_err; |
65780c56 LB |
392 | packets = stats->vs.xdp_packets; |
393 | bytes = stats->vs.xdp_bytes; | |
66fe4a07 | 394 | drops = stats->vs.rx_drops; |
4195e54a | 395 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
5fe6e567 | 396 | result->peer_tq_xdp_xmit_err += peer_tq_xdp_xmit_err; |
d99a7c2f | 397 | result->xdp_tx_err += xdp_tx_err; |
4195e54a TM |
398 | result->xdp_packets += packets; |
399 | result->xdp_bytes += bytes; | |
66fe4a07 | 400 | result->rx_drops += drops; |
4195e54a TM |
401 | } |
402 | } | |
403 | ||
bc1f4470 | 404 | static void veth_get_stats64(struct net_device *dev, |
405 | struct rtnl_link_stats64 *tot) | |
2681128f ED |
406 | { |
407 | struct veth_priv *priv = netdev_priv(dev); | |
d0e2c55e | 408 | struct net_device *peer; |
65780c56 | 409 | struct veth_stats rx; |
b4fba476 | 410 | u64 packets, bytes; |
4195e54a | 411 | |
b4fba476 ED |
412 | tot->tx_dropped = veth_stats_tx(dev, &packets, &bytes); |
413 | tot->tx_bytes = bytes; | |
414 | tot->tx_packets = packets; | |
2681128f | 415 | |
4195e54a | 416 | veth_stats_rx(&rx, dev); |
5fe6e567 LB |
417 | tot->tx_dropped += rx.xdp_tx_err; |
418 | tot->rx_dropped = rx.rx_drops + rx.peer_tq_xdp_xmit_err; | |
4195e54a TM |
419 | tot->rx_bytes = rx.xdp_bytes; |
420 | tot->rx_packets = rx.xdp_packets; | |
2681128f | 421 | |
d0e2c55e ED |
422 | rcu_read_lock(); |
423 | peer = rcu_dereference(priv->peer); | |
424 | if (peer) { | |
e25d5dbc | 425 | veth_stats_tx(peer, &packets, &bytes); |
b4fba476 ED |
426 | tot->rx_bytes += bytes; |
427 | tot->rx_packets += packets; | |
4195e54a TM |
428 | |
429 | veth_stats_rx(&rx, peer); | |
5fe6e567 LB |
430 | tot->tx_dropped += rx.peer_tq_xdp_xmit_err; |
431 | tot->rx_dropped += rx.xdp_tx_err; | |
4195e54a TM |
432 | tot->tx_bytes += rx.xdp_bytes; |
433 | tot->tx_packets += rx.xdp_packets; | |
d0e2c55e ED |
434 | } |
435 | rcu_read_unlock(); | |
e314dbdc PE |
436 | } |
437 | ||
5c70ef85 G |
438 | /* fake multicast ability */ |
439 | static void veth_set_multicast_list(struct net_device *dev) | |
440 | { | |
441 | } | |
442 | ||
948d4f21 TM |
443 | static struct sk_buff *veth_build_skb(void *head, int headroom, int len, |
444 | int buflen) | |
445 | { | |
446 | struct sk_buff *skb; | |
447 | ||
948d4f21 TM |
448 | skb = build_skb(head, buflen); |
449 | if (!skb) | |
450 | return NULL; | |
451 | ||
452 | skb_reserve(skb, headroom); | |
453 | skb_put(skb, len); | |
454 | ||
455 | return skb; | |
456 | } | |
457 | ||
638264dc TM |
458 | static int veth_select_rxq(struct net_device *dev) |
459 | { | |
460 | return smp_processor_id() % dev->real_num_rx_queues; | |
461 | } | |
462 | ||
9aa1206e DB |
463 | static struct net_device *veth_peer_dev(struct net_device *dev) |
464 | { | |
465 | struct veth_priv *priv = netdev_priv(dev); | |
466 | ||
467 | /* Callers must be under RCU read side. */ | |
468 | return rcu_dereference(priv->peer); | |
469 | } | |
470 | ||
af87a3aa | 471 | static int veth_xdp_xmit(struct net_device *dev, int n, |
9152cff0 LB |
472 | struct xdp_frame **frames, |
473 | u32 flags, bool ndo_xmit) | |
af87a3aa TM |
474 | { |
475 | struct veth_priv *rcv_priv, *priv = netdev_priv(dev); | |
fdc13979 | 476 | int i, ret = -ENXIO, nxmit = 0; |
af87a3aa | 477 | struct net_device *rcv; |
5fe6e567 | 478 | unsigned int max_len; |
638264dc | 479 | struct veth_rq *rq; |
af87a3aa | 480 | |
5fe6e567 | 481 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
d99a7c2f | 482 | return -EINVAL; |
af87a3aa | 483 | |
5fe6e567 | 484 | rcu_read_lock(); |
af87a3aa | 485 | rcv = rcu_dereference(priv->peer); |
5fe6e567 LB |
486 | if (unlikely(!rcv)) |
487 | goto out; | |
af87a3aa TM |
488 | |
489 | rcv_priv = netdev_priv(rcv); | |
5fe6e567 | 490 | rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
0e672f30 THJ |
491 | /* The napi pointer is set if NAPI is enabled, which ensures that |
492 | * xdp_ring is initialized on receive side and the peer device is up. | |
af87a3aa | 493 | */ |
0e672f30 | 494 | if (!rcu_access_pointer(rq->napi)) |
5fe6e567 | 495 | goto out; |
af87a3aa TM |
496 | |
497 | max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN; | |
498 | ||
638264dc | 499 | spin_lock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
500 | for (i = 0; i < n; i++) { |
501 | struct xdp_frame *frame = frames[i]; | |
502 | void *ptr = veth_xdp_to_ptr(frame); | |
503 | ||
504 | if (unlikely(frame->len > max_len || | |
fdc13979 LB |
505 | __ptr_ring_produce(&rq->xdp_ring, ptr))) |
506 | break; | |
507 | nxmit++; | |
af87a3aa | 508 | } |
638264dc | 509 | spin_unlock(&rq->xdp_ring.producer_lock); |
af87a3aa TM |
510 | |
511 | if (flags & XDP_XMIT_FLUSH) | |
638264dc | 512 | __veth_xdp_flush(rq); |
af87a3aa | 513 | |
fdc13979 | 514 | ret = nxmit; |
9152cff0 | 515 | if (ndo_xmit) { |
5fe6e567 | 516 | u64_stats_update_begin(&rq->stats.syncp); |
fdc13979 LB |
517 | rq->stats.vs.peer_tq_xdp_xmit += nxmit; |
518 | rq->stats.vs.peer_tq_xdp_xmit_err += n - nxmit; | |
5fe6e567 | 519 | u64_stats_update_end(&rq->stats.syncp); |
9152cff0 | 520 | } |
9152cff0 | 521 | |
5fe6e567 | 522 | out: |
b23bfa56 | 523 | rcu_read_unlock(); |
2131479d TM |
524 | |
525 | return ret; | |
af87a3aa TM |
526 | } |
527 | ||
9152cff0 LB |
528 | static int veth_ndo_xdp_xmit(struct net_device *dev, int n, |
529 | struct xdp_frame **frames, u32 flags) | |
530 | { | |
5fe6e567 LB |
531 | int err; |
532 | ||
533 | err = veth_xdp_xmit(dev, n, frames, flags, true); | |
534 | if (err < 0) { | |
535 | struct veth_priv *priv = netdev_priv(dev); | |
536 | ||
537 | atomic64_add(n, &priv->dropped); | |
538 | } | |
539 | ||
540 | return err; | |
9152cff0 LB |
541 | } |
542 | ||
bd32aa1f | 543 | static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
9cda7807 | 544 | { |
fdc13979 | 545 | int sent, i, err = 0, drops; |
9cda7807 | 546 | |
bd32aa1f | 547 | sent = veth_xdp_xmit(rq->dev, bq->count, bq->q, 0, false); |
9cda7807 TM |
548 | if (sent < 0) { |
549 | err = sent; | |
550 | sent = 0; | |
9cda7807 | 551 | } |
fdc13979 LB |
552 | |
553 | for (i = sent; unlikely(i < bq->count); i++) | |
554 | xdp_return_frame(bq->q[i]); | |
555 | ||
556 | drops = bq->count - sent; | |
557 | trace_xdp_bulk_tx(rq->dev, sent, drops, err); | |
9cda7807 | 558 | |
5fe6e567 LB |
559 | u64_stats_update_begin(&rq->stats.syncp); |
560 | rq->stats.vs.xdp_tx += sent; | |
fdc13979 | 561 | rq->stats.vs.xdp_tx_err += drops; |
5fe6e567 LB |
562 | u64_stats_update_end(&rq->stats.syncp); |
563 | ||
9cda7807 TM |
564 | bq->count = 0; |
565 | } | |
566 | ||
bd32aa1f | 567 | static void veth_xdp_flush(struct veth_rq *rq, struct veth_xdp_tx_bq *bq) |
d1396004 | 568 | { |
bd32aa1f | 569 | struct veth_priv *rcv_priv, *priv = netdev_priv(rq->dev); |
d1396004 | 570 | struct net_device *rcv; |
bd32aa1f | 571 | struct veth_rq *rcv_rq; |
d1396004 TM |
572 | |
573 | rcu_read_lock(); | |
bd32aa1f | 574 | veth_xdp_flush_bq(rq, bq); |
d1396004 TM |
575 | rcv = rcu_dereference(priv->peer); |
576 | if (unlikely(!rcv)) | |
577 | goto out; | |
578 | ||
579 | rcv_priv = netdev_priv(rcv); | |
bd32aa1f | 580 | rcv_rq = &rcv_priv->rq[veth_select_rxq(rcv)]; |
d1396004 | 581 | /* xdp_ring is initialized on receive side? */ |
bd32aa1f | 582 | if (unlikely(!rcu_access_pointer(rcv_rq->xdp_prog))) |
d1396004 TM |
583 | goto out; |
584 | ||
bd32aa1f | 585 | __veth_xdp_flush(rcv_rq); |
d1396004 TM |
586 | out: |
587 | rcu_read_unlock(); | |
588 | } | |
589 | ||
bd32aa1f | 590 | static int veth_xdp_tx(struct veth_rq *rq, struct xdp_buff *xdp, |
9cda7807 | 591 | struct veth_xdp_tx_bq *bq) |
d1396004 | 592 | { |
1b698fa5 | 593 | struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp); |
d1396004 TM |
594 | |
595 | if (unlikely(!frame)) | |
596 | return -EOVERFLOW; | |
597 | ||
9cda7807 | 598 | if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE)) |
bd32aa1f | 599 | veth_xdp_flush_bq(rq, bq); |
9cda7807 TM |
600 | |
601 | bq->q[bq->count++] = frame; | |
602 | ||
603 | return 0; | |
d1396004 TM |
604 | } |
605 | ||
65e6dcf7 LB |
606 | static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq, |
607 | struct xdp_frame *frame, | |
608 | struct veth_xdp_tx_bq *bq, | |
609 | struct veth_stats *stats) | |
9fc8d518 | 610 | { |
d1396004 | 611 | struct xdp_frame orig_frame; |
9fc8d518 | 612 | struct bpf_prog *xdp_prog; |
9fc8d518 TM |
613 | |
614 | rcu_read_lock(); | |
638264dc | 615 | xdp_prog = rcu_dereference(rq->xdp_prog); |
9fc8d518 TM |
616 | if (likely(xdp_prog)) { |
617 | struct xdp_buff xdp; | |
618 | u32 act; | |
619 | ||
fc379872 | 620 | xdp_convert_frame_to_buff(frame, &xdp); |
638264dc | 621 | xdp.rxq = &rq->xdp_rxq; |
9fc8d518 TM |
622 | |
623 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
624 | ||
625 | switch (act) { | |
626 | case XDP_PASS: | |
89f479f0 LB |
627 | if (xdp_update_frame_from_buff(&xdp, frame)) |
628 | goto err_xdp; | |
9fc8d518 | 629 | break; |
d1396004 TM |
630 | case XDP_TX: |
631 | orig_frame = *frame; | |
d1396004 | 632 | xdp.rxq->mem = frame->mem; |
bd32aa1f | 633 | if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) { |
638264dc | 634 | trace_xdp_exception(rq->dev, xdp_prog, act); |
d1396004 | 635 | frame = &orig_frame; |
1c5b82e5 | 636 | stats->rx_drops++; |
d1396004 TM |
637 | goto err_xdp; |
638 | } | |
1c5b82e5 | 639 | stats->xdp_tx++; |
d1396004 TM |
640 | rcu_read_unlock(); |
641 | goto xdp_xmit; | |
642 | case XDP_REDIRECT: | |
643 | orig_frame = *frame; | |
d1396004 | 644 | xdp.rxq->mem = frame->mem; |
638264dc | 645 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
d1396004 | 646 | frame = &orig_frame; |
1c5b82e5 | 647 | stats->rx_drops++; |
d1396004 TM |
648 | goto err_xdp; |
649 | } | |
1c5b82e5 | 650 | stats->xdp_redirect++; |
d1396004 TM |
651 | rcu_read_unlock(); |
652 | goto xdp_xmit; | |
9fc8d518 TM |
653 | default: |
654 | bpf_warn_invalid_xdp_action(act); | |
df561f66 | 655 | fallthrough; |
9fc8d518 | 656 | case XDP_ABORTED: |
638264dc | 657 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 658 | fallthrough; |
9fc8d518 | 659 | case XDP_DROP: |
1c5b82e5 | 660 | stats->xdp_drops++; |
9fc8d518 TM |
661 | goto err_xdp; |
662 | } | |
663 | } | |
664 | rcu_read_unlock(); | |
665 | ||
65e6dcf7 | 666 | return frame; |
9fc8d518 TM |
667 | err_xdp: |
668 | rcu_read_unlock(); | |
669 | xdp_return_frame(frame); | |
d1396004 | 670 | xdp_xmit: |
9fc8d518 TM |
671 | return NULL; |
672 | } | |
673 | ||
65e6dcf7 LB |
674 | /* frames array contains VETH_XDP_BATCH at most */ |
675 | static void veth_xdp_rcv_bulk_skb(struct veth_rq *rq, void **frames, | |
676 | int n_xdpf, struct veth_xdp_tx_bq *bq, | |
677 | struct veth_stats *stats) | |
678 | { | |
679 | void *skbs[VETH_XDP_BATCH]; | |
680 | int i; | |
681 | ||
682 | if (xdp_alloc_skb_bulk(skbs, n_xdpf, | |
683 | GFP_ATOMIC | __GFP_ZERO) < 0) { | |
684 | for (i = 0; i < n_xdpf; i++) | |
685 | xdp_return_frame(frames[i]); | |
686 | stats->rx_drops += n_xdpf; | |
687 | ||
688 | return; | |
689 | } | |
690 | ||
691 | for (i = 0; i < n_xdpf; i++) { | |
692 | struct sk_buff *skb = skbs[i]; | |
693 | ||
694 | skb = __xdp_build_skb_from_frame(frames[i], skb, | |
695 | rq->dev); | |
696 | if (!skb) { | |
697 | xdp_return_frame(frames[i]); | |
698 | stats->rx_drops++; | |
699 | continue; | |
700 | } | |
701 | napi_gro_receive(&rq->xdp_napi, skb); | |
702 | } | |
703 | } | |
704 | ||
1c5b82e5 LB |
705 | static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, |
706 | struct sk_buff *skb, | |
707 | struct veth_xdp_tx_bq *bq, | |
708 | struct veth_stats *stats) | |
948d4f21 | 709 | { |
43b5169d | 710 | u32 pktlen, headroom, act, metalen, frame_sz; |
948d4f21 TM |
711 | void *orig_data, *orig_data_end; |
712 | struct bpf_prog *xdp_prog; | |
713 | int mac_len, delta, off; | |
714 | struct xdp_buff xdp; | |
715 | ||
d504fff0 | 716 | skb_prepare_for_gro(skb); |
4bf9ffa0 | 717 | |
948d4f21 | 718 | rcu_read_lock(); |
638264dc | 719 | xdp_prog = rcu_dereference(rq->xdp_prog); |
948d4f21 TM |
720 | if (unlikely(!xdp_prog)) { |
721 | rcu_read_unlock(); | |
722 | goto out; | |
723 | } | |
724 | ||
725 | mac_len = skb->data - skb_mac_header(skb); | |
726 | pktlen = skb->len + mac_len; | |
727 | headroom = skb_headroom(skb) - mac_len; | |
728 | ||
729 | if (skb_shared(skb) || skb_head_is_locked(skb) || | |
730 | skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) { | |
731 | struct sk_buff *nskb; | |
732 | int size, head_off; | |
733 | void *head, *start; | |
734 | struct page *page; | |
735 | ||
736 | size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) + | |
737 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
738 | if (size > PAGE_SIZE) | |
739 | goto drop; | |
740 | ||
741 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | |
742 | if (!page) | |
743 | goto drop; | |
744 | ||
745 | head = page_address(page); | |
746 | start = head + VETH_XDP_HEADROOM; | |
747 | if (skb_copy_bits(skb, -mac_len, start, pktlen)) { | |
748 | page_frag_free(head); | |
749 | goto drop; | |
750 | } | |
751 | ||
45a9e6d8 JDB |
752 | nskb = veth_build_skb(head, VETH_XDP_HEADROOM + mac_len, |
753 | skb->len, PAGE_SIZE); | |
948d4f21 TM |
754 | if (!nskb) { |
755 | page_frag_free(head); | |
756 | goto drop; | |
757 | } | |
758 | ||
759 | skb_copy_header(nskb, skb); | |
760 | head_off = skb_headroom(nskb) - skb_headroom(skb); | |
761 | skb_headers_offset_update(nskb, head_off); | |
948d4f21 TM |
762 | consume_skb(skb); |
763 | skb = nskb; | |
764 | } | |
765 | ||
45a9e6d8 | 766 | /* SKB "head" area always have tailroom for skb_shared_info */ |
be9df4af | 767 | frame_sz = skb_end_pointer(skb) - skb->head; |
43b5169d LB |
768 | frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
769 | xdp_init_buff(&xdp, frame_sz, &rq->xdp_rxq); | |
be9df4af | 770 | xdp_prepare_buff(&xdp, skb->head, skb->mac_header, pktlen, true); |
45a9e6d8 | 771 | |
948d4f21 TM |
772 | orig_data = xdp.data; |
773 | orig_data_end = xdp.data_end; | |
774 | ||
775 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
776 | ||
777 | switch (act) { | |
778 | case XDP_PASS: | |
779 | break; | |
d1396004 TM |
780 | case XDP_TX: |
781 | get_page(virt_to_page(xdp.data)); | |
782 | consume_skb(skb); | |
638264dc | 783 | xdp.rxq->mem = rq->xdp_mem; |
bd32aa1f | 784 | if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) { |
638264dc | 785 | trace_xdp_exception(rq->dev, xdp_prog, act); |
1c5b82e5 | 786 | stats->rx_drops++; |
d1396004 TM |
787 | goto err_xdp; |
788 | } | |
1c5b82e5 | 789 | stats->xdp_tx++; |
d1396004 TM |
790 | rcu_read_unlock(); |
791 | goto xdp_xmit; | |
792 | case XDP_REDIRECT: | |
793 | get_page(virt_to_page(xdp.data)); | |
794 | consume_skb(skb); | |
638264dc | 795 | xdp.rxq->mem = rq->xdp_mem; |
1c5b82e5 LB |
796 | if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { |
797 | stats->rx_drops++; | |
d1396004 | 798 | goto err_xdp; |
1c5b82e5 LB |
799 | } |
800 | stats->xdp_redirect++; | |
d1396004 TM |
801 | rcu_read_unlock(); |
802 | goto xdp_xmit; | |
948d4f21 TM |
803 | default: |
804 | bpf_warn_invalid_xdp_action(act); | |
df561f66 | 805 | fallthrough; |
948d4f21 | 806 | case XDP_ABORTED: |
638264dc | 807 | trace_xdp_exception(rq->dev, xdp_prog, act); |
df561f66 | 808 | fallthrough; |
948d4f21 | 809 | case XDP_DROP: |
1c5b82e5 LB |
810 | stats->xdp_drops++; |
811 | goto xdp_drop; | |
948d4f21 TM |
812 | } |
813 | rcu_read_unlock(); | |
814 | ||
45a9e6d8 | 815 | /* check if bpf_xdp_adjust_head was used */ |
948d4f21 TM |
816 | delta = orig_data - xdp.data; |
817 | off = mac_len + delta; | |
818 | if (off > 0) | |
819 | __skb_push(skb, off); | |
820 | else if (off < 0) | |
821 | __skb_pull(skb, -off); | |
822 | skb->mac_header -= delta; | |
45a9e6d8 JDB |
823 | |
824 | /* check if bpf_xdp_adjust_tail was used */ | |
948d4f21 TM |
825 | off = xdp.data_end - orig_data_end; |
826 | if (off != 0) | |
45a9e6d8 | 827 | __skb_put(skb, off); /* positive on grow, negative on shrink */ |
638264dc | 828 | skb->protocol = eth_type_trans(skb, rq->dev); |
948d4f21 TM |
829 | |
830 | metalen = xdp.data - xdp.data_meta; | |
831 | if (metalen) | |
832 | skb_metadata_set(skb, metalen); | |
833 | out: | |
834 | return skb; | |
835 | drop: | |
1c5b82e5 LB |
836 | stats->rx_drops++; |
837 | xdp_drop: | |
948d4f21 TM |
838 | rcu_read_unlock(); |
839 | kfree_skb(skb); | |
840 | return NULL; | |
d1396004 TM |
841 | err_xdp: |
842 | rcu_read_unlock(); | |
843 | page_frag_free(xdp.data); | |
844 | xdp_xmit: | |
845 | return NULL; | |
948d4f21 TM |
846 | } |
847 | ||
1c5b82e5 LB |
848 | static int veth_xdp_rcv(struct veth_rq *rq, int budget, |
849 | struct veth_xdp_tx_bq *bq, | |
850 | struct veth_stats *stats) | |
948d4f21 | 851 | { |
65e6dcf7 LB |
852 | int i, done = 0, n_xdpf = 0; |
853 | void *xdpf[VETH_XDP_BATCH]; | |
948d4f21 TM |
854 | |
855 | for (i = 0; i < budget; i++) { | |
638264dc | 856 | void *ptr = __ptr_ring_consume(&rq->xdp_ring); |
948d4f21 | 857 | |
9fc8d518 | 858 | if (!ptr) |
948d4f21 TM |
859 | break; |
860 | ||
d1396004 | 861 | if (veth_is_xdp_frame(ptr)) { |
65e6dcf7 | 862 | /* ndo_xdp_xmit */ |
4195e54a TM |
863 | struct xdp_frame *frame = veth_ptr_to_xdp(ptr); |
864 | ||
1c5b82e5 | 865 | stats->xdp_bytes += frame->len; |
65e6dcf7 LB |
866 | frame = veth_xdp_rcv_one(rq, frame, bq, stats); |
867 | if (frame) { | |
868 | /* XDP_PASS */ | |
869 | xdpf[n_xdpf++] = frame; | |
870 | if (n_xdpf == VETH_XDP_BATCH) { | |
871 | veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, | |
872 | bq, stats); | |
873 | n_xdpf = 0; | |
874 | } | |
875 | } | |
d1396004 | 876 | } else { |
65e6dcf7 LB |
877 | /* ndo_start_xmit */ |
878 | struct sk_buff *skb = ptr; | |
879 | ||
1c5b82e5 LB |
880 | stats->xdp_bytes += skb->len; |
881 | skb = veth_xdp_rcv_skb(rq, skb, bq, stats); | |
65e6dcf7 LB |
882 | if (skb) |
883 | napi_gro_receive(&rq->xdp_napi, skb); | |
d1396004 | 884 | } |
948d4f21 TM |
885 | done++; |
886 | } | |
887 | ||
65e6dcf7 LB |
888 | if (n_xdpf) |
889 | veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, bq, stats); | |
890 | ||
4195e54a | 891 | u64_stats_update_begin(&rq->stats.syncp); |
9152cff0 | 892 | rq->stats.vs.xdp_redirect += stats->xdp_redirect; |
1c5b82e5 | 893 | rq->stats.vs.xdp_bytes += stats->xdp_bytes; |
66fe4a07 LB |
894 | rq->stats.vs.xdp_drops += stats->xdp_drops; |
895 | rq->stats.vs.rx_drops += stats->rx_drops; | |
65780c56 | 896 | rq->stats.vs.xdp_packets += done; |
4195e54a TM |
897 | u64_stats_update_end(&rq->stats.syncp); |
898 | ||
948d4f21 TM |
899 | return done; |
900 | } | |
901 | ||
902 | static int veth_poll(struct napi_struct *napi, int budget) | |
903 | { | |
638264dc TM |
904 | struct veth_rq *rq = |
905 | container_of(napi, struct veth_rq, xdp_napi); | |
1c5b82e5 | 906 | struct veth_stats stats = {}; |
9cda7807 | 907 | struct veth_xdp_tx_bq bq; |
948d4f21 TM |
908 | int done; |
909 | ||
9cda7807 TM |
910 | bq.count = 0; |
911 | ||
d1396004 | 912 | xdp_set_return_frame_no_direct(); |
1c5b82e5 | 913 | done = veth_xdp_rcv(rq, budget, &bq, &stats); |
948d4f21 TM |
914 | |
915 | if (done < budget && napi_complete_done(napi, done)) { | |
916 | /* Write rx_notify_masked before reading ptr_ring */ | |
638264dc TM |
917 | smp_store_mb(rq->rx_notify_masked, false); |
918 | if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) { | |
919 | rq->rx_notify_masked = true; | |
920 | napi_schedule(&rq->xdp_napi); | |
948d4f21 TM |
921 | } |
922 | } | |
923 | ||
1c5b82e5 | 924 | if (stats.xdp_tx > 0) |
bd32aa1f | 925 | veth_xdp_flush(rq, &bq); |
1c5b82e5 | 926 | if (stats.xdp_redirect > 0) |
1d233886 | 927 | xdp_do_flush(); |
d1396004 TM |
928 | xdp_clear_return_frame_no_direct(); |
929 | ||
948d4f21 TM |
930 | return done; |
931 | } | |
932 | ||
dedd53c5 | 933 | static int __veth_napi_enable_range(struct net_device *dev, int start, int end) |
948d4f21 TM |
934 | { |
935 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 936 | int err, i; |
948d4f21 | 937 | |
dedd53c5 | 938 | for (i = start; i < end; i++) { |
638264dc TM |
939 | struct veth_rq *rq = &priv->rq[i]; |
940 | ||
941 | err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL); | |
942 | if (err) | |
943 | goto err_xdp_ring; | |
944 | } | |
948d4f21 | 945 | |
dedd53c5 | 946 | for (i = start; i < end; i++) { |
638264dc TM |
947 | struct veth_rq *rq = &priv->rq[i]; |
948 | ||
638264dc | 949 | napi_enable(&rq->xdp_napi); |
d3256efd | 950 | rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi); |
638264dc | 951 | } |
948d4f21 TM |
952 | |
953 | return 0; | |
dedd53c5 | 954 | |
638264dc | 955 | err_xdp_ring: |
dedd53c5 | 956 | for (i--; i >= start; i--) |
638264dc TM |
957 | ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free); |
958 | ||
959 | return err; | |
948d4f21 TM |
960 | } |
961 | ||
dedd53c5 PA |
962 | static int __veth_napi_enable(struct net_device *dev) |
963 | { | |
964 | return __veth_napi_enable_range(dev, 0, dev->real_num_rx_queues); | |
965 | } | |
966 | ||
967 | static void veth_napi_del_range(struct net_device *dev, int start, int end) | |
948d4f21 TM |
968 | { |
969 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 970 | int i; |
948d4f21 | 971 | |
dedd53c5 | 972 | for (i = start; i < end; i++) { |
638264dc TM |
973 | struct veth_rq *rq = &priv->rq[i]; |
974 | ||
d3256efd | 975 | rcu_assign_pointer(priv->rq[i].napi, NULL); |
638264dc | 976 | napi_disable(&rq->xdp_napi); |
5198d545 | 977 | __netif_napi_del(&rq->xdp_napi); |
638264dc TM |
978 | } |
979 | synchronize_net(); | |
980 | ||
dedd53c5 | 981 | for (i = start; i < end; i++) { |
638264dc TM |
982 | struct veth_rq *rq = &priv->rq[i]; |
983 | ||
638264dc TM |
984 | rq->rx_notify_masked = false; |
985 | ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); | |
986 | } | |
948d4f21 TM |
987 | } |
988 | ||
dedd53c5 PA |
989 | static void veth_napi_del(struct net_device *dev) |
990 | { | |
991 | veth_napi_del_range(dev, 0, dev->real_num_rx_queues); | |
992 | } | |
993 | ||
d3256efd PA |
994 | static bool veth_gro_requested(const struct net_device *dev) |
995 | { | |
996 | return !!(dev->wanted_features & NETIF_F_GRO); | |
997 | } | |
998 | ||
dedd53c5 PA |
999 | static int veth_enable_xdp_range(struct net_device *dev, int start, int end, |
1000 | bool napi_already_on) | |
948d4f21 TM |
1001 | { |
1002 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1003 | int err, i; |
948d4f21 | 1004 | |
dedd53c5 PA |
1005 | for (i = start; i < end; i++) { |
1006 | struct veth_rq *rq = &priv->rq[i]; | |
948d4f21 | 1007 | |
dedd53c5 PA |
1008 | if (!napi_already_on) |
1009 | netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT); | |
1010 | err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i, rq->xdp_napi.napi_id); | |
1011 | if (err < 0) | |
1012 | goto err_rxq_reg; | |
1013 | ||
1014 | err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq, | |
1015 | MEM_TYPE_PAGE_SHARED, | |
1016 | NULL); | |
1017 | if (err < 0) | |
1018 | goto err_reg_mem; | |
1019 | ||
1020 | /* Save original mem info as it can be overwritten */ | |
1021 | rq->xdp_mem = rq->xdp_rxq.mem; | |
1022 | } | |
1023 | return 0; | |
638264dc | 1024 | |
dedd53c5 PA |
1025 | err_reg_mem: |
1026 | xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq); | |
1027 | err_rxq_reg: | |
1028 | for (i--; i >= start; i--) { | |
1029 | struct veth_rq *rq = &priv->rq[i]; | |
638264dc | 1030 | |
dedd53c5 PA |
1031 | xdp_rxq_info_unreg(&rq->xdp_rxq); |
1032 | if (!napi_already_on) | |
1033 | netif_napi_del(&rq->xdp_napi); | |
1034 | } | |
1035 | ||
1036 | return err; | |
1037 | } | |
1038 | ||
1039 | static void veth_disable_xdp_range(struct net_device *dev, int start, int end, | |
1040 | bool delete_napi) | |
1041 | { | |
1042 | struct veth_priv *priv = netdev_priv(dev); | |
1043 | int i; | |
1044 | ||
1045 | for (i = start; i < end; i++) { | |
1046 | struct veth_rq *rq = &priv->rq[i]; | |
1047 | ||
1048 | rq->xdp_rxq.mem = rq->xdp_mem; | |
1049 | xdp_rxq_info_unreg(&rq->xdp_rxq); | |
1050 | ||
1051 | if (delete_napi) | |
1052 | netif_napi_del(&rq->xdp_napi); | |
1053 | } | |
1054 | } | |
1055 | ||
1056 | static int veth_enable_xdp(struct net_device *dev) | |
1057 | { | |
1058 | bool napi_already_on = veth_gro_requested(dev) && (dev->flags & IFF_UP); | |
1059 | struct veth_priv *priv = netdev_priv(dev); | |
1060 | int err, i; | |
1061 | ||
1062 | if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) { | |
1063 | err = veth_enable_xdp_range(dev, 0, dev->real_num_rx_queues, napi_already_on); | |
1064 | if (err) | |
1065 | return err; | |
948d4f21 | 1066 | |
d3256efd PA |
1067 | if (!napi_already_on) { |
1068 | err = __veth_napi_enable(dev); | |
dedd53c5 PA |
1069 | if (err) { |
1070 | veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, true); | |
1071 | return err; | |
1072 | } | |
d3256efd PA |
1073 | |
1074 | if (!veth_gro_requested(dev)) { | |
1075 | /* user-space did not require GRO, but adding XDP | |
1076 | * is supposed to get GRO working | |
1077 | */ | |
1078 | dev->features |= NETIF_F_GRO; | |
1079 | netdev_features_change(dev); | |
1080 | } | |
1081 | } | |
948d4f21 TM |
1082 | } |
1083 | ||
d3256efd | 1084 | for (i = 0; i < dev->real_num_rx_queues; i++) { |
638264dc | 1085 | rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog); |
d3256efd PA |
1086 | rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi); |
1087 | } | |
948d4f21 TM |
1088 | |
1089 | return 0; | |
948d4f21 TM |
1090 | } |
1091 | ||
1092 | static void veth_disable_xdp(struct net_device *dev) | |
1093 | { | |
1094 | struct veth_priv *priv = netdev_priv(dev); | |
638264dc | 1095 | int i; |
948d4f21 | 1096 | |
638264dc TM |
1097 | for (i = 0; i < dev->real_num_rx_queues; i++) |
1098 | rcu_assign_pointer(priv->rq[i].xdp_prog, NULL); | |
d3256efd PA |
1099 | |
1100 | if (!netif_running(dev) || !veth_gro_requested(dev)) { | |
1101 | veth_napi_del(dev); | |
1102 | ||
1103 | /* if user-space did not require GRO, since adding XDP | |
1104 | * enabled it, clear it now | |
1105 | */ | |
1106 | if (!veth_gro_requested(dev) && netif_running(dev)) { | |
1107 | dev->features &= ~NETIF_F_GRO; | |
1108 | netdev_features_change(dev); | |
1109 | } | |
1110 | } | |
1111 | ||
dedd53c5 | 1112 | veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, false); |
948d4f21 TM |
1113 | } |
1114 | ||
dedd53c5 | 1115 | static int veth_napi_enable_range(struct net_device *dev, int start, int end) |
d3256efd PA |
1116 | { |
1117 | struct veth_priv *priv = netdev_priv(dev); | |
1118 | int err, i; | |
1119 | ||
dedd53c5 | 1120 | for (i = start; i < end; i++) { |
d3256efd PA |
1121 | struct veth_rq *rq = &priv->rq[i]; |
1122 | ||
1123 | netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT); | |
1124 | } | |
1125 | ||
dedd53c5 | 1126 | err = __veth_napi_enable_range(dev, start, end); |
d3256efd | 1127 | if (err) { |
dedd53c5 | 1128 | for (i = start; i < end; i++) { |
d3256efd PA |
1129 | struct veth_rq *rq = &priv->rq[i]; |
1130 | ||
1131 | netif_napi_del(&rq->xdp_napi); | |
1132 | } | |
1133 | return err; | |
1134 | } | |
1135 | return err; | |
1136 | } | |
1137 | ||
dedd53c5 PA |
1138 | static int veth_napi_enable(struct net_device *dev) |
1139 | { | |
1140 | return veth_napi_enable_range(dev, 0, dev->real_num_rx_queues); | |
1141 | } | |
1142 | ||
4752eeb3 PA |
1143 | static void veth_disable_range_safe(struct net_device *dev, int start, int end) |
1144 | { | |
1145 | struct veth_priv *priv = netdev_priv(dev); | |
1146 | ||
1147 | if (start >= end) | |
1148 | return; | |
1149 | ||
1150 | if (priv->_xdp_prog) { | |
1151 | veth_napi_del_range(dev, start, end); | |
1152 | veth_disable_xdp_range(dev, start, end, false); | |
1153 | } else if (veth_gro_requested(dev)) { | |
1154 | veth_napi_del_range(dev, start, end); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | static int veth_enable_range_safe(struct net_device *dev, int start, int end) | |
1159 | { | |
1160 | struct veth_priv *priv = netdev_priv(dev); | |
1161 | int err; | |
1162 | ||
1163 | if (start >= end) | |
1164 | return 0; | |
1165 | ||
1166 | if (priv->_xdp_prog) { | |
1167 | /* these channels are freshly initialized, napi is not on there even | |
1168 | * when GRO is requeste | |
1169 | */ | |
1170 | err = veth_enable_xdp_range(dev, start, end, false); | |
1171 | if (err) | |
1172 | return err; | |
1173 | ||
1174 | err = __veth_napi_enable_range(dev, start, end); | |
1175 | if (err) { | |
1176 | /* on error always delete the newly added napis */ | |
1177 | veth_disable_xdp_range(dev, start, end, true); | |
1178 | return err; | |
1179 | } | |
1180 | } else if (veth_gro_requested(dev)) { | |
1181 | return veth_napi_enable_range(dev, start, end); | |
1182 | } | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | static int veth_set_channels(struct net_device *dev, | |
1187 | struct ethtool_channels *ch) | |
1188 | { | |
1189 | struct veth_priv *priv = netdev_priv(dev); | |
1190 | unsigned int old_rx_count, new_rx_count; | |
1191 | struct veth_priv *peer_priv; | |
1192 | struct net_device *peer; | |
1193 | int err; | |
1194 | ||
1195 | /* sanity check. Upper bounds are already enforced by the caller */ | |
1196 | if (!ch->rx_count || !ch->tx_count) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | /* avoid braking XDP, if that is enabled */ | |
1200 | peer = rtnl_dereference(priv->peer); | |
1201 | peer_priv = peer ? netdev_priv(peer) : NULL; | |
1202 | if (priv->_xdp_prog && peer && ch->rx_count < peer->real_num_tx_queues) | |
1203 | return -EINVAL; | |
1204 | ||
1205 | if (peer && peer_priv && peer_priv->_xdp_prog && ch->tx_count > peer->real_num_rx_queues) | |
1206 | return -EINVAL; | |
1207 | ||
1208 | old_rx_count = dev->real_num_rx_queues; | |
1209 | new_rx_count = ch->rx_count; | |
1210 | if (netif_running(dev)) { | |
1211 | /* turn device off */ | |
1212 | netif_carrier_off(dev); | |
1213 | if (peer) | |
1214 | netif_carrier_off(peer); | |
1215 | ||
1216 | /* try to allocate new resurces, as needed*/ | |
1217 | err = veth_enable_range_safe(dev, old_rx_count, new_rx_count); | |
1218 | if (err) | |
1219 | goto out; | |
1220 | } | |
1221 | ||
1222 | err = netif_set_real_num_rx_queues(dev, ch->rx_count); | |
1223 | if (err) | |
1224 | goto revert; | |
1225 | ||
1226 | err = netif_set_real_num_tx_queues(dev, ch->tx_count); | |
1227 | if (err) { | |
1228 | int err2 = netif_set_real_num_rx_queues(dev, old_rx_count); | |
1229 | ||
1230 | /* this error condition could happen only if rx and tx change | |
1231 | * in opposite directions (e.g. tx nr raises, rx nr decreases) | |
1232 | * and we can't do anything to fully restore the original | |
1233 | * status | |
1234 | */ | |
1235 | if (err2) | |
1236 | pr_warn("Can't restore rx queues config %d -> %d %d", | |
1237 | new_rx_count, old_rx_count, err2); | |
1238 | else | |
1239 | goto revert; | |
1240 | } | |
1241 | ||
1242 | out: | |
1243 | if (netif_running(dev)) { | |
1244 | /* note that we need to swap the arguments WRT the enable part | |
1245 | * to identify the range we have to disable | |
1246 | */ | |
1247 | veth_disable_range_safe(dev, new_rx_count, old_rx_count); | |
1248 | netif_carrier_on(dev); | |
1249 | if (peer) | |
1250 | netif_carrier_on(peer); | |
1251 | } | |
1252 | return err; | |
1253 | ||
1254 | revert: | |
1255 | new_rx_count = old_rx_count; | |
1256 | old_rx_count = ch->rx_count; | |
1257 | goto out; | |
1258 | } | |
1259 | ||
e314dbdc PE |
1260 | static int veth_open(struct net_device *dev) |
1261 | { | |
d0e2c55e ED |
1262 | struct veth_priv *priv = netdev_priv(dev); |
1263 | struct net_device *peer = rtnl_dereference(priv->peer); | |
948d4f21 | 1264 | int err; |
e314dbdc | 1265 | |
d0e2c55e | 1266 | if (!peer) |
e314dbdc PE |
1267 | return -ENOTCONN; |
1268 | ||
948d4f21 TM |
1269 | if (priv->_xdp_prog) { |
1270 | err = veth_enable_xdp(dev); | |
1271 | if (err) | |
1272 | return err; | |
d3256efd PA |
1273 | } else if (veth_gro_requested(dev)) { |
1274 | err = veth_napi_enable(dev); | |
1275 | if (err) | |
1276 | return err; | |
948d4f21 TM |
1277 | } |
1278 | ||
d0e2c55e | 1279 | if (peer->flags & IFF_UP) { |
e314dbdc | 1280 | netif_carrier_on(dev); |
d0e2c55e | 1281 | netif_carrier_on(peer); |
e314dbdc | 1282 | } |
948d4f21 | 1283 | |
e314dbdc PE |
1284 | return 0; |
1285 | } | |
1286 | ||
2cf48a10 EB |
1287 | static int veth_close(struct net_device *dev) |
1288 | { | |
1289 | struct veth_priv *priv = netdev_priv(dev); | |
2efd32ee | 1290 | struct net_device *peer = rtnl_dereference(priv->peer); |
2cf48a10 EB |
1291 | |
1292 | netif_carrier_off(dev); | |
2efd32ee ED |
1293 | if (peer) |
1294 | netif_carrier_off(peer); | |
2cf48a10 | 1295 | |
948d4f21 TM |
1296 | if (priv->_xdp_prog) |
1297 | veth_disable_xdp(dev); | |
d3256efd PA |
1298 | else if (veth_gro_requested(dev)) |
1299 | veth_napi_del(dev); | |
948d4f21 | 1300 | |
2cf48a10 EB |
1301 | return 0; |
1302 | } | |
1303 | ||
91572088 | 1304 | static int is_valid_veth_mtu(int mtu) |
38d40815 | 1305 | { |
91572088 | 1306 | return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU; |
38d40815 EB |
1307 | } |
1308 | ||
7797b93b TM |
1309 | static int veth_alloc_queues(struct net_device *dev) |
1310 | { | |
1311 | struct veth_priv *priv = netdev_priv(dev); | |
1312 | int i; | |
1313 | ||
1314 | priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL); | |
1315 | if (!priv->rq) | |
1316 | return -ENOMEM; | |
1317 | ||
4195e54a | 1318 | for (i = 0; i < dev->num_rx_queues; i++) { |
7797b93b | 1319 | priv->rq[i].dev = dev; |
4195e54a TM |
1320 | u64_stats_init(&priv->rq[i].stats.syncp); |
1321 | } | |
7797b93b TM |
1322 | |
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | static void veth_free_queues(struct net_device *dev) | |
1327 | { | |
1328 | struct veth_priv *priv = netdev_priv(dev); | |
1329 | ||
1330 | kfree(priv->rq); | |
1331 | } | |
1332 | ||
e314dbdc PE |
1333 | static int veth_dev_init(struct net_device *dev) |
1334 | { | |
7797b93b TM |
1335 | int err; |
1336 | ||
14d73416 LR |
1337 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
1338 | if (!dev->lstats) | |
e314dbdc | 1339 | return -ENOMEM; |
7797b93b TM |
1340 | |
1341 | err = veth_alloc_queues(dev); | |
1342 | if (err) { | |
14d73416 | 1343 | free_percpu(dev->lstats); |
7797b93b TM |
1344 | return err; |
1345 | } | |
1346 | ||
e314dbdc PE |
1347 | return 0; |
1348 | } | |
1349 | ||
11687a10 DM |
1350 | static void veth_dev_free(struct net_device *dev) |
1351 | { | |
7797b93b | 1352 | veth_free_queues(dev); |
14d73416 | 1353 | free_percpu(dev->lstats); |
11687a10 DM |
1354 | } |
1355 | ||
bb446c19 WC |
1356 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1357 | static void veth_poll_controller(struct net_device *dev) | |
1358 | { | |
1359 | /* veth only receives frames when its peer sends one | |
948d4f21 | 1360 | * Since it has nothing to do with disabling irqs, we are guaranteed |
bb446c19 WC |
1361 | * never to have pending data when we poll for it so |
1362 | * there is nothing to do here. | |
1363 | * | |
1364 | * We need this though so netpoll recognizes us as an interface that | |
1365 | * supports polling, which enables bridge devices in virt setups to | |
1366 | * still use netconsole | |
1367 | */ | |
1368 | } | |
1369 | #endif /* CONFIG_NET_POLL_CONTROLLER */ | |
1370 | ||
a45253bf ND |
1371 | static int veth_get_iflink(const struct net_device *dev) |
1372 | { | |
1373 | struct veth_priv *priv = netdev_priv(dev); | |
1374 | struct net_device *peer; | |
1375 | int iflink; | |
1376 | ||
1377 | rcu_read_lock(); | |
1378 | peer = rcu_dereference(priv->peer); | |
1379 | iflink = peer ? peer->ifindex : 0; | |
1380 | rcu_read_unlock(); | |
1381 | ||
1382 | return iflink; | |
1383 | } | |
1384 | ||
dc224822 TM |
1385 | static netdev_features_t veth_fix_features(struct net_device *dev, |
1386 | netdev_features_t features) | |
1387 | { | |
1388 | struct veth_priv *priv = netdev_priv(dev); | |
1389 | struct net_device *peer; | |
1390 | ||
1391 | peer = rtnl_dereference(priv->peer); | |
1392 | if (peer) { | |
1393 | struct veth_priv *peer_priv = netdev_priv(peer); | |
1394 | ||
1395 | if (peer_priv->_xdp_prog) | |
1396 | features &= ~NETIF_F_GSO_SOFTWARE; | |
1397 | } | |
d3256efd PA |
1398 | if (priv->_xdp_prog) |
1399 | features |= NETIF_F_GRO; | |
dc224822 TM |
1400 | |
1401 | return features; | |
1402 | } | |
1403 | ||
d3256efd PA |
1404 | static int veth_set_features(struct net_device *dev, |
1405 | netdev_features_t features) | |
1406 | { | |
1407 | netdev_features_t changed = features ^ dev->features; | |
1408 | struct veth_priv *priv = netdev_priv(dev); | |
1409 | int err; | |
1410 | ||
1411 | if (!(changed & NETIF_F_GRO) || !(dev->flags & IFF_UP) || priv->_xdp_prog) | |
1412 | return 0; | |
1413 | ||
1414 | if (features & NETIF_F_GRO) { | |
1415 | err = veth_napi_enable(dev); | |
1416 | if (err) | |
1417 | return err; | |
1418 | } else { | |
1419 | veth_napi_del(dev); | |
1420 | } | |
1421 | return 0; | |
1422 | } | |
1423 | ||
163e5292 PA |
1424 | static void veth_set_rx_headroom(struct net_device *dev, int new_hr) |
1425 | { | |
1426 | struct veth_priv *peer_priv, *priv = netdev_priv(dev); | |
1427 | struct net_device *peer; | |
1428 | ||
1429 | if (new_hr < 0) | |
1430 | new_hr = 0; | |
1431 | ||
1432 | rcu_read_lock(); | |
1433 | peer = rcu_dereference(priv->peer); | |
1434 | if (unlikely(!peer)) | |
1435 | goto out; | |
1436 | ||
1437 | peer_priv = netdev_priv(peer); | |
1438 | priv->requested_headroom = new_hr; | |
1439 | new_hr = max(priv->requested_headroom, peer_priv->requested_headroom); | |
1440 | dev->needed_headroom = new_hr; | |
1441 | peer->needed_headroom = new_hr; | |
1442 | ||
1443 | out: | |
1444 | rcu_read_unlock(); | |
1445 | } | |
1446 | ||
948d4f21 TM |
1447 | static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
1448 | struct netlink_ext_ack *extack) | |
1449 | { | |
1450 | struct veth_priv *priv = netdev_priv(dev); | |
1451 | struct bpf_prog *old_prog; | |
1452 | struct net_device *peer; | |
dc224822 | 1453 | unsigned int max_mtu; |
948d4f21 TM |
1454 | int err; |
1455 | ||
1456 | old_prog = priv->_xdp_prog; | |
1457 | priv->_xdp_prog = prog; | |
1458 | peer = rtnl_dereference(priv->peer); | |
1459 | ||
1460 | if (prog) { | |
1461 | if (!peer) { | |
1462 | NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); | |
1463 | err = -ENOTCONN; | |
1464 | goto err; | |
1465 | } | |
1466 | ||
dc224822 TM |
1467 | max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM - |
1468 | peer->hard_header_len - | |
1469 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1470 | if (peer->mtu > max_mtu) { | |
1471 | NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); | |
1472 | err = -ERANGE; | |
1473 | goto err; | |
1474 | } | |
1475 | ||
638264dc TM |
1476 | if (dev->real_num_rx_queues < peer->real_num_tx_queues) { |
1477 | NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues"); | |
1478 | err = -ENOSPC; | |
1479 | goto err; | |
1480 | } | |
1481 | ||
948d4f21 TM |
1482 | if (dev->flags & IFF_UP) { |
1483 | err = veth_enable_xdp(dev); | |
1484 | if (err) { | |
1485 | NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed"); | |
1486 | goto err; | |
1487 | } | |
1488 | } | |
dc224822 TM |
1489 | |
1490 | if (!old_prog) { | |
1491 | peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; | |
1492 | peer->max_mtu = max_mtu; | |
1493 | } | |
948d4f21 TM |
1494 | } |
1495 | ||
1496 | if (old_prog) { | |
dc224822 TM |
1497 | if (!prog) { |
1498 | if (dev->flags & IFF_UP) | |
1499 | veth_disable_xdp(dev); | |
1500 | ||
1501 | if (peer) { | |
1502 | peer->hw_features |= NETIF_F_GSO_SOFTWARE; | |
1503 | peer->max_mtu = ETH_MAX_MTU; | |
1504 | } | |
1505 | } | |
948d4f21 TM |
1506 | bpf_prog_put(old_prog); |
1507 | } | |
1508 | ||
dc224822 TM |
1509 | if ((!!old_prog ^ !!prog) && peer) |
1510 | netdev_update_features(peer); | |
1511 | ||
948d4f21 TM |
1512 | return 0; |
1513 | err: | |
1514 | priv->_xdp_prog = old_prog; | |
1515 | ||
1516 | return err; | |
1517 | } | |
1518 | ||
948d4f21 TM |
1519 | static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
1520 | { | |
1521 | switch (xdp->command) { | |
1522 | case XDP_SETUP_PROG: | |
1523 | return veth_xdp_set(dev, xdp->prog, xdp->extack); | |
948d4f21 TM |
1524 | default: |
1525 | return -EINVAL; | |
1526 | } | |
1527 | } | |
1528 | ||
4456e7bd | 1529 | static const struct net_device_ops veth_netdev_ops = { |
ee923623 DL |
1530 | .ndo_init = veth_dev_init, |
1531 | .ndo_open = veth_open, | |
2cf48a10 | 1532 | .ndo_stop = veth_close, |
ee923623 | 1533 | .ndo_start_xmit = veth_xmit, |
6311cc44 | 1534 | .ndo_get_stats64 = veth_get_stats64, |
5c70ef85 | 1535 | .ndo_set_rx_mode = veth_set_multicast_list, |
ee923623 | 1536 | .ndo_set_mac_address = eth_mac_addr, |
bb446c19 WC |
1537 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1538 | .ndo_poll_controller = veth_poll_controller, | |
1539 | #endif | |
a45253bf | 1540 | .ndo_get_iflink = veth_get_iflink, |
dc224822 | 1541 | .ndo_fix_features = veth_fix_features, |
d3256efd | 1542 | .ndo_set_features = veth_set_features, |
1a04a821 | 1543 | .ndo_features_check = passthru_features_check, |
163e5292 | 1544 | .ndo_set_rx_headroom = veth_set_rx_headroom, |
948d4f21 | 1545 | .ndo_bpf = veth_xdp, |
9152cff0 | 1546 | .ndo_xdp_xmit = veth_ndo_xdp_xmit, |
9aa1206e | 1547 | .ndo_get_peer_dev = veth_peer_dev, |
4456e7bd SH |
1548 | }; |
1549 | ||
732912d7 | 1550 | #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \ |
c80fafbb | 1551 | NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \ |
732912d7 | 1552 | NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \ |
28d2b136 PM |
1553 | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \ |
1554 | NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX ) | |
8093315a | 1555 | |
e314dbdc PE |
1556 | static void veth_setup(struct net_device *dev) |
1557 | { | |
1558 | ether_setup(dev); | |
1559 | ||
550fd08c | 1560 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
23ea5a96 | 1561 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
02f01ec1 | 1562 | dev->priv_flags |= IFF_NO_QUEUE; |
163e5292 | 1563 | dev->priv_flags |= IFF_PHONY_HEADROOM; |
550fd08c | 1564 | |
4456e7bd | 1565 | dev->netdev_ops = &veth_netdev_ops; |
e314dbdc PE |
1566 | dev->ethtool_ops = &veth_ethtool_ops; |
1567 | dev->features |= NETIF_F_LLTX; | |
8093315a | 1568 | dev->features |= VETH_FEATURES; |
8d0d21f4 | 1569 | dev->vlan_features = dev->features & |
3f8c707b VY |
1570 | ~(NETIF_F_HW_VLAN_CTAG_TX | |
1571 | NETIF_F_HW_VLAN_STAG_TX | | |
1572 | NETIF_F_HW_VLAN_CTAG_RX | | |
1573 | NETIF_F_HW_VLAN_STAG_RX); | |
cf124db5 DM |
1574 | dev->needs_free_netdev = true; |
1575 | dev->priv_destructor = veth_dev_free; | |
91572088 | 1576 | dev->max_mtu = ETH_MAX_MTU; |
a2c725fa | 1577 | |
8093315a | 1578 | dev->hw_features = VETH_FEATURES; |
82d81898 | 1579 | dev->hw_enc_features = VETH_FEATURES; |
607fca9a | 1580 | dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; |
e314dbdc PE |
1581 | } |
1582 | ||
1583 | /* | |
1584 | * netlink interface | |
1585 | */ | |
1586 | ||
a8b8a889 MS |
1587 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[], |
1588 | struct netlink_ext_ack *extack) | |
e314dbdc PE |
1589 | { |
1590 | if (tb[IFLA_ADDRESS]) { | |
1591 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1592 | return -EINVAL; | |
1593 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1594 | return -EADDRNOTAVAIL; | |
1595 | } | |
38d40815 EB |
1596 | if (tb[IFLA_MTU]) { |
1597 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) | |
1598 | return -EINVAL; | |
1599 | } | |
e314dbdc PE |
1600 | return 0; |
1601 | } | |
1602 | ||
1603 | static struct rtnl_link_ops veth_link_ops; | |
1604 | ||
d3256efd PA |
1605 | static void veth_disable_gro(struct net_device *dev) |
1606 | { | |
1607 | dev->features &= ~NETIF_F_GRO; | |
1608 | dev->wanted_features &= ~NETIF_F_GRO; | |
1609 | netdev_update_features(dev); | |
1610 | } | |
1611 | ||
9d3684c2 PA |
1612 | static int veth_init_queues(struct net_device *dev, struct nlattr *tb[]) |
1613 | { | |
1614 | int err; | |
1615 | ||
1616 | if (!tb[IFLA_NUM_TX_QUEUES] && dev->num_tx_queues > 1) { | |
1617 | err = netif_set_real_num_tx_queues(dev, 1); | |
1618 | if (err) | |
1619 | return err; | |
1620 | } | |
1621 | if (!tb[IFLA_NUM_RX_QUEUES] && dev->num_rx_queues > 1) { | |
1622 | err = netif_set_real_num_rx_queues(dev, 1); | |
1623 | if (err) | |
1624 | return err; | |
1625 | } | |
1626 | return 0; | |
1627 | } | |
1628 | ||
81adee47 | 1629 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1630 | struct nlattr *tb[], struct nlattr *data[], |
1631 | struct netlink_ext_ack *extack) | |
e314dbdc | 1632 | { |
7797b93b | 1633 | int err; |
e314dbdc PE |
1634 | struct net_device *peer; |
1635 | struct veth_priv *priv; | |
1636 | char ifname[IFNAMSIZ]; | |
1637 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; | |
5517750f | 1638 | unsigned char name_assign_type; |
3729d502 | 1639 | struct ifinfomsg *ifmp; |
81adee47 | 1640 | struct net *net; |
e314dbdc PE |
1641 | |
1642 | /* | |
1643 | * create and register peer first | |
e314dbdc | 1644 | */ |
e314dbdc PE |
1645 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
1646 | struct nlattr *nla_peer; | |
1647 | ||
1648 | nla_peer = data[VETH_INFO_PEER]; | |
3729d502 | 1649 | ifmp = nla_data(nla_peer); |
f7b12606 JP |
1650 | err = rtnl_nla_parse_ifla(peer_tb, |
1651 | nla_data(nla_peer) + sizeof(struct ifinfomsg), | |
fceb6435 JB |
1652 | nla_len(nla_peer) - sizeof(struct ifinfomsg), |
1653 | NULL); | |
e314dbdc PE |
1654 | if (err < 0) |
1655 | return err; | |
1656 | ||
a8b8a889 | 1657 | err = veth_validate(peer_tb, NULL, extack); |
e314dbdc PE |
1658 | if (err < 0) |
1659 | return err; | |
1660 | ||
1661 | tbp = peer_tb; | |
3729d502 PM |
1662 | } else { |
1663 | ifmp = NULL; | |
e314dbdc | 1664 | tbp = tb; |
3729d502 | 1665 | } |
e314dbdc | 1666 | |
191cdb38 | 1667 | if (ifmp && tbp[IFLA_IFNAME]) { |
872f6903 | 1668 | nla_strscpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
5517750f TG |
1669 | name_assign_type = NET_NAME_USER; |
1670 | } else { | |
e314dbdc | 1671 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
5517750f TG |
1672 | name_assign_type = NET_NAME_ENUM; |
1673 | } | |
e314dbdc | 1674 | |
81adee47 EB |
1675 | net = rtnl_link_get_net(src_net, tbp); |
1676 | if (IS_ERR(net)) | |
1677 | return PTR_ERR(net); | |
1678 | ||
5517750f | 1679 | peer = rtnl_create_link(net, ifname, name_assign_type, |
d0522f1c | 1680 | &veth_link_ops, tbp, extack); |
81adee47 EB |
1681 | if (IS_ERR(peer)) { |
1682 | put_net(net); | |
e314dbdc | 1683 | return PTR_ERR(peer); |
81adee47 | 1684 | } |
e314dbdc | 1685 | |
191cdb38 | 1686 | if (!ifmp || !tbp[IFLA_ADDRESS]) |
f2cedb63 | 1687 | eth_hw_addr_random(peer); |
e6f8f1a7 PE |
1688 | |
1689 | if (ifmp && (dev->ifindex != 0)) | |
1690 | peer->ifindex = ifmp->ifi_index; | |
e314dbdc | 1691 | |
72d24955 SH |
1692 | peer->gso_max_size = dev->gso_max_size; |
1693 | peer->gso_max_segs = dev->gso_max_segs; | |
1694 | ||
e314dbdc | 1695 | err = register_netdevice(peer); |
81adee47 EB |
1696 | put_net(net); |
1697 | net = NULL; | |
e314dbdc PE |
1698 | if (err < 0) |
1699 | goto err_register_peer; | |
1700 | ||
d3256efd PA |
1701 | /* keep GRO disabled by default to be consistent with the established |
1702 | * veth behavior | |
1703 | */ | |
1704 | veth_disable_gro(peer); | |
e314dbdc PE |
1705 | netif_carrier_off(peer); |
1706 | ||
3729d502 PM |
1707 | err = rtnl_configure_link(peer, ifmp); |
1708 | if (err < 0) | |
1709 | goto err_configure_peer; | |
1710 | ||
e314dbdc PE |
1711 | /* |
1712 | * register dev last | |
1713 | * | |
1714 | * note, that since we've registered new device the dev's name | |
1715 | * should be re-allocated | |
1716 | */ | |
1717 | ||
1718 | if (tb[IFLA_ADDRESS] == NULL) | |
f2cedb63 | 1719 | eth_hw_addr_random(dev); |
e314dbdc | 1720 | |
6c8c4446 | 1721 | if (tb[IFLA_IFNAME]) |
872f6903 | 1722 | nla_strscpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); |
6c8c4446 JP |
1723 | else |
1724 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); | |
1725 | ||
e314dbdc PE |
1726 | err = register_netdevice(dev); |
1727 | if (err < 0) | |
1728 | goto err_register_dev; | |
1729 | ||
1730 | netif_carrier_off(dev); | |
1731 | ||
1732 | /* | |
1733 | * tie the deviced together | |
1734 | */ | |
1735 | ||
1736 | priv = netdev_priv(dev); | |
d0e2c55e | 1737 | rcu_assign_pointer(priv->peer, peer); |
9d3684c2 PA |
1738 | err = veth_init_queues(dev, tb); |
1739 | if (err) | |
1740 | goto err_queues; | |
e314dbdc PE |
1741 | |
1742 | priv = netdev_priv(peer); | |
d0e2c55e | 1743 | rcu_assign_pointer(priv->peer, dev); |
9d3684c2 PA |
1744 | err = veth_init_queues(peer, tb); |
1745 | if (err) | |
1746 | goto err_queues; | |
948d4f21 | 1747 | |
d3256efd | 1748 | veth_disable_gro(dev); |
e314dbdc PE |
1749 | return 0; |
1750 | ||
9d3684c2 PA |
1751 | err_queues: |
1752 | unregister_netdevice(dev); | |
e314dbdc PE |
1753 | err_register_dev: |
1754 | /* nothing to do */ | |
3729d502 | 1755 | err_configure_peer: |
e314dbdc PE |
1756 | unregister_netdevice(peer); |
1757 | return err; | |
1758 | ||
1759 | err_register_peer: | |
1760 | free_netdev(peer); | |
1761 | return err; | |
1762 | } | |
1763 | ||
23289a37 | 1764 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
e314dbdc PE |
1765 | { |
1766 | struct veth_priv *priv; | |
1767 | struct net_device *peer; | |
1768 | ||
1769 | priv = netdev_priv(dev); | |
d0e2c55e ED |
1770 | peer = rtnl_dereference(priv->peer); |
1771 | ||
1772 | /* Note : dellink() is called from default_device_exit_batch(), | |
1773 | * before a rcu_synchronize() point. The devices are guaranteed | |
1774 | * not being freed before one RCU grace period. | |
1775 | */ | |
1776 | RCU_INIT_POINTER(priv->peer, NULL); | |
24540535 | 1777 | unregister_netdevice_queue(dev, head); |
f45a5c26 ED |
1778 | |
1779 | if (peer) { | |
1780 | priv = netdev_priv(peer); | |
1781 | RCU_INIT_POINTER(priv->peer, NULL); | |
1782 | unregister_netdevice_queue(peer, head); | |
1783 | } | |
e314dbdc PE |
1784 | } |
1785 | ||
23711438 TG |
1786 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { |
1787 | [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, | |
1788 | }; | |
e314dbdc | 1789 | |
e5f4e7b9 ND |
1790 | static struct net *veth_get_link_net(const struct net_device *dev) |
1791 | { | |
1792 | struct veth_priv *priv = netdev_priv(dev); | |
1793 | struct net_device *peer = rtnl_dereference(priv->peer); | |
1794 | ||
1795 | return peer ? dev_net(peer) : dev_net(dev); | |
1796 | } | |
1797 | ||
9d3684c2 PA |
1798 | static unsigned int veth_get_num_queues(void) |
1799 | { | |
1800 | /* enforce the same queue limit as rtnl_create_link */ | |
1801 | int queues = num_possible_cpus(); | |
1802 | ||
1803 | if (queues > 4096) | |
1804 | queues = 4096; | |
1805 | return queues; | |
1806 | } | |
1807 | ||
e314dbdc PE |
1808 | static struct rtnl_link_ops veth_link_ops = { |
1809 | .kind = DRV_NAME, | |
1810 | .priv_size = sizeof(struct veth_priv), | |
1811 | .setup = veth_setup, | |
1812 | .validate = veth_validate, | |
1813 | .newlink = veth_newlink, | |
1814 | .dellink = veth_dellink, | |
1815 | .policy = veth_policy, | |
1816 | .maxtype = VETH_INFO_MAX, | |
e5f4e7b9 | 1817 | .get_link_net = veth_get_link_net, |
9d3684c2 PA |
1818 | .get_num_tx_queues = veth_get_num_queues, |
1819 | .get_num_rx_queues = veth_get_num_queues, | |
e314dbdc PE |
1820 | }; |
1821 | ||
1822 | /* | |
1823 | * init/fini | |
1824 | */ | |
1825 | ||
1826 | static __init int veth_init(void) | |
1827 | { | |
1828 | return rtnl_link_register(&veth_link_ops); | |
1829 | } | |
1830 | ||
1831 | static __exit void veth_exit(void) | |
1832 | { | |
68365458 | 1833 | rtnl_link_unregister(&veth_link_ops); |
e314dbdc PE |
1834 | } |
1835 | ||
1836 | module_init(veth_init); | |
1837 | module_exit(veth_exit); | |
1838 | ||
1839 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); | |
1840 | MODULE_LICENSE("GPL v2"); | |
1841 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |