/*
|
* drivers/net/veth.c
|
*
|
* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
|
*
|
* Author: Pavel Emelianov <xemul@openvz.org>
|
* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
|
*
|
*/
|
|
#include <linux/netdevice.h>
|
#include <linux/slab.h>
|
#include <linux/ethtool.h>
|
#include <linux/etherdevice.h>
|
#include <linux/u64_stats_sync.h>
|
|
#include <net/rtnetlink.h>
|
#include <net/dst.h>
|
#include <net/xfrm.h>
|
#include <net/xdp.h>
|
#include <linux/veth.h>
|
#include <linux/module.h>
|
#include <linux/bpf.h>
|
#include <linux/filter.h>
|
#include <linux/ptr_ring.h>
|
#include <linux/bpf_trace.h>
|
|
#define DRV_NAME "veth"
|
#define DRV_VERSION "1.0"
|
|
#define VETH_XDP_FLAG BIT(0)
|
#define VETH_RING_SIZE 256
|
#define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN)
|
|
/* Separating two types of XDP xmit */
|
#define VETH_XDP_TX BIT(0)
|
#define VETH_XDP_REDIR BIT(1)
|
|
struct pcpu_vstats {
|
u64 packets;
|
u64 bytes;
|
struct u64_stats_sync syncp;
|
};
|
|
struct veth_rq {
|
struct napi_struct xdp_napi;
|
struct net_device *dev;
|
struct bpf_prog __rcu *xdp_prog;
|
struct xdp_mem_info xdp_mem;
|
bool rx_notify_masked;
|
struct ptr_ring xdp_ring;
|
struct xdp_rxq_info xdp_rxq;
|
};
|
|
struct veth_priv {
|
struct net_device __rcu *peer;
|
atomic64_t dropped;
|
struct bpf_prog *_xdp_prog;
|
struct veth_rq *rq;
|
unsigned int requested_headroom;
|
};
|
|
/*
|
* ethtool interface
|
*/
|
|
static struct {
|
const char string[ETH_GSTRING_LEN];
|
} ethtool_stats_keys[] = {
|
{ "peer_ifindex" },
|
};
|
|
static int veth_get_link_ksettings(struct net_device *dev,
|
struct ethtool_link_ksettings *cmd)
|
{
|
cmd->base.speed = SPEED_10000;
|
cmd->base.duplex = DUPLEX_FULL;
|
cmd->base.port = PORT_TP;
|
cmd->base.autoneg = AUTONEG_DISABLE;
|
return 0;
|
}
|
|
static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
|
{
|
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
|
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
|
}
|
|
static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
|
{
|
switch(stringset) {
|
case ETH_SS_STATS:
|
memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
|
break;
|
}
|
}
|
|
static int veth_get_sset_count(struct net_device *dev, int sset)
|
{
|
switch (sset) {
|
case ETH_SS_STATS:
|
return ARRAY_SIZE(ethtool_stats_keys);
|
default:
|
return -EOPNOTSUPP;
|
}
|
}
|
|
static void veth_get_ethtool_stats(struct net_device *dev,
|
struct ethtool_stats *stats, u64 *data)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
|
data[0] = peer ? peer->ifindex : 0;
|
}
|
|
static const struct ethtool_ops veth_ethtool_ops = {
|
.get_drvinfo = veth_get_drvinfo,
|
.get_link = ethtool_op_get_link,
|
.get_strings = veth_get_strings,
|
.get_sset_count = veth_get_sset_count,
|
.get_ethtool_stats = veth_get_ethtool_stats,
|
.get_link_ksettings = veth_get_link_ksettings,
|
};
|
|
/* general routines */
|
|
static bool veth_is_xdp_frame(void *ptr)
|
{
|
return (unsigned long)ptr & VETH_XDP_FLAG;
|
}
|
|
static void *veth_ptr_to_xdp(void *ptr)
|
{
|
return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG);
|
}
|
|
static void *veth_xdp_to_ptr(void *ptr)
|
{
|
return (void *)((unsigned long)ptr | VETH_XDP_FLAG);
|
}
|
|
static void veth_ptr_free(void *ptr)
|
{
|
if (veth_is_xdp_frame(ptr))
|
xdp_return_frame(veth_ptr_to_xdp(ptr));
|
else
|
kfree_skb(ptr);
|
}
|
|
static void __veth_xdp_flush(struct veth_rq *rq)
|
{
|
/* Write ptr_ring before reading rx_notify_masked */
|
smp_mb();
|
if (!READ_ONCE(rq->rx_notify_masked) &&
|
napi_schedule_prep(&rq->xdp_napi)) {
|
WRITE_ONCE(rq->rx_notify_masked, true);
|
__napi_schedule(&rq->xdp_napi);
|
}
|
}
|
|
static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb)
|
{
|
if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) {
|
dev_kfree_skb_any(skb);
|
return NET_RX_DROP;
|
}
|
|
return NET_RX_SUCCESS;
|
}
|
|
static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb,
|
struct veth_rq *rq, bool xdp)
|
{
|
return __dev_forward_skb(dev, skb) ?: xdp ?
|
veth_xdp_rx(rq, skb) :
|
netif_rx(skb);
|
}
|
|
static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
|
{
|
struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
|
struct veth_rq *rq = NULL;
|
struct net_device *rcv;
|
int length = skb->len;
|
bool rcv_xdp = false;
|
int rxq;
|
|
rcu_read_lock();
|
rcv = rcu_dereference(priv->peer);
|
if (unlikely(!rcv)) {
|
kfree_skb(skb);
|
goto drop;
|
}
|
|
rcv_priv = netdev_priv(rcv);
|
rxq = skb_get_queue_mapping(skb);
|
if (rxq < rcv->real_num_rx_queues) {
|
rq = &rcv_priv->rq[rxq];
|
rcv_xdp = rcu_access_pointer(rq->xdp_prog);
|
}
|
|
if (likely(veth_forward_skb(rcv, skb, rq, rcv_xdp) == NET_RX_SUCCESS)) {
|
struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
|
|
u64_stats_update_begin(&stats->syncp);
|
stats->bytes += length;
|
stats->packets++;
|
u64_stats_update_end(&stats->syncp);
|
} else {
|
drop:
|
atomic64_inc(&priv->dropped);
|
}
|
|
if (rcv_xdp)
|
__veth_xdp_flush(rq);
|
|
rcu_read_unlock();
|
|
return NETDEV_TX_OK;
|
}
|
|
static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
int cpu;
|
|
result->packets = 0;
|
result->bytes = 0;
|
for_each_possible_cpu(cpu) {
|
struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
|
u64 packets, bytes;
|
unsigned int start;
|
|
do {
|
start = u64_stats_fetch_begin_irq(&stats->syncp);
|
packets = stats->packets;
|
bytes = stats->bytes;
|
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
|
result->packets += packets;
|
result->bytes += bytes;
|
}
|
return atomic64_read(&priv->dropped);
|
}
|
|
static void veth_get_stats64(struct net_device *dev,
|
struct rtnl_link_stats64 *tot)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer;
|
struct pcpu_vstats one;
|
|
tot->tx_dropped = veth_stats_one(&one, dev);
|
tot->tx_bytes = one.bytes;
|
tot->tx_packets = one.packets;
|
|
rcu_read_lock();
|
peer = rcu_dereference(priv->peer);
|
if (peer) {
|
tot->rx_dropped = veth_stats_one(&one, peer);
|
tot->rx_bytes = one.bytes;
|
tot->rx_packets = one.packets;
|
}
|
rcu_read_unlock();
|
}
|
|
/* fake multicast ability */
|
static void veth_set_multicast_list(struct net_device *dev)
|
{
|
}
|
|
static struct sk_buff *veth_build_skb(void *head, int headroom, int len,
|
int buflen)
|
{
|
struct sk_buff *skb;
|
|
if (!buflen) {
|
buflen = SKB_DATA_ALIGN(headroom + len) +
|
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
|
}
|
skb = build_skb(head, buflen);
|
if (!skb)
|
return NULL;
|
|
skb_reserve(skb, headroom);
|
skb_put(skb, len);
|
|
return skb;
|
}
|
|
static int veth_select_rxq(struct net_device *dev)
|
{
|
return smp_processor_id() % dev->real_num_rx_queues;
|
}
|
|
static int veth_xdp_xmit(struct net_device *dev, int n,
|
struct xdp_frame **frames, u32 flags)
|
{
|
struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
|
struct net_device *rcv;
|
unsigned int max_len;
|
struct veth_rq *rq;
|
int i, drops = 0;
|
|
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
|
return -EINVAL;
|
|
rcv = rcu_dereference(priv->peer);
|
if (unlikely(!rcv))
|
return -ENXIO;
|
|
rcv_priv = netdev_priv(rcv);
|
rq = &rcv_priv->rq[veth_select_rxq(rcv)];
|
/* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive
|
* side. This means an XDP program is loaded on the peer and the peer
|
* device is up.
|
*/
|
if (!rcu_access_pointer(rq->xdp_prog))
|
return -ENXIO;
|
|
max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN;
|
|
spin_lock(&rq->xdp_ring.producer_lock);
|
for (i = 0; i < n; i++) {
|
struct xdp_frame *frame = frames[i];
|
void *ptr = veth_xdp_to_ptr(frame);
|
|
if (unlikely(frame->len > max_len ||
|
__ptr_ring_produce(&rq->xdp_ring, ptr))) {
|
xdp_return_frame_rx_napi(frame);
|
drops++;
|
}
|
}
|
spin_unlock(&rq->xdp_ring.producer_lock);
|
|
if (flags & XDP_XMIT_FLUSH)
|
__veth_xdp_flush(rq);
|
|
return n - drops;
|
}
|
|
static void veth_xdp_flush(struct net_device *dev)
|
{
|
struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
|
struct net_device *rcv;
|
struct veth_rq *rq;
|
|
rcu_read_lock();
|
rcv = rcu_dereference(priv->peer);
|
if (unlikely(!rcv))
|
goto out;
|
|
rcv_priv = netdev_priv(rcv);
|
rq = &rcv_priv->rq[veth_select_rxq(rcv)];
|
/* xdp_ring is initialized on receive side? */
|
if (unlikely(!rcu_access_pointer(rq->xdp_prog)))
|
goto out;
|
|
__veth_xdp_flush(rq);
|
out:
|
rcu_read_unlock();
|
}
|
|
static int veth_xdp_tx(struct net_device *dev, struct xdp_buff *xdp)
|
{
|
struct xdp_frame *frame = convert_to_xdp_frame(xdp);
|
|
if (unlikely(!frame))
|
return -EOVERFLOW;
|
|
return veth_xdp_xmit(dev, 1, &frame, 0);
|
}
|
|
static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq,
|
struct xdp_frame *frame,
|
unsigned int *xdp_xmit)
|
{
|
void *hard_start = frame->data - frame->headroom;
|
int len = frame->len, delta = 0;
|
struct xdp_frame orig_frame;
|
struct bpf_prog *xdp_prog;
|
unsigned int headroom;
|
struct sk_buff *skb;
|
|
/* bpf_xdp_adjust_head() assures BPF cannot access xdp_frame area */
|
hard_start -= sizeof(struct xdp_frame);
|
|
rcu_read_lock();
|
xdp_prog = rcu_dereference(rq->xdp_prog);
|
if (likely(xdp_prog)) {
|
struct xdp_buff xdp;
|
u32 act;
|
|
xdp.data_hard_start = hard_start;
|
xdp.data = frame->data;
|
xdp.data_end = frame->data + frame->len;
|
xdp.data_meta = frame->data - frame->metasize;
|
xdp.rxq = &rq->xdp_rxq;
|
|
act = bpf_prog_run_xdp(xdp_prog, &xdp);
|
|
switch (act) {
|
case XDP_PASS:
|
delta = frame->data - xdp.data;
|
len = xdp.data_end - xdp.data;
|
break;
|
case XDP_TX:
|
orig_frame = *frame;
|
xdp.rxq->mem = frame->mem;
|
if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) {
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
frame = &orig_frame;
|
goto err_xdp;
|
}
|
*xdp_xmit |= VETH_XDP_TX;
|
rcu_read_unlock();
|
goto xdp_xmit;
|
case XDP_REDIRECT:
|
orig_frame = *frame;
|
xdp.rxq->mem = frame->mem;
|
if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) {
|
frame = &orig_frame;
|
goto err_xdp;
|
}
|
*xdp_xmit |= VETH_XDP_REDIR;
|
rcu_read_unlock();
|
goto xdp_xmit;
|
default:
|
bpf_warn_invalid_xdp_action(act);
|
case XDP_ABORTED:
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
case XDP_DROP:
|
goto err_xdp;
|
}
|
}
|
rcu_read_unlock();
|
|
headroom = sizeof(struct xdp_frame) + frame->headroom - delta;
|
skb = veth_build_skb(hard_start, headroom, len, 0);
|
if (!skb) {
|
xdp_return_frame(frame);
|
goto err;
|
}
|
|
xdp_scrub_frame(frame);
|
skb->protocol = eth_type_trans(skb, rq->dev);
|
err:
|
return skb;
|
err_xdp:
|
rcu_read_unlock();
|
xdp_return_frame(frame);
|
xdp_xmit:
|
return NULL;
|
}
|
|
static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, struct sk_buff *skb,
|
unsigned int *xdp_xmit)
|
{
|
u32 pktlen, headroom, act, metalen;
|
void *orig_data, *orig_data_end;
|
struct bpf_prog *xdp_prog;
|
int mac_len, delta, off;
|
struct xdp_buff xdp;
|
|
skb_orphan(skb);
|
|
rcu_read_lock();
|
xdp_prog = rcu_dereference(rq->xdp_prog);
|
if (unlikely(!xdp_prog)) {
|
rcu_read_unlock();
|
goto out;
|
}
|
|
mac_len = skb->data - skb_mac_header(skb);
|
pktlen = skb->len + mac_len;
|
headroom = skb_headroom(skb) - mac_len;
|
|
if (skb_shared(skb) || skb_head_is_locked(skb) ||
|
skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) {
|
struct sk_buff *nskb;
|
int size, head_off;
|
void *head, *start;
|
struct page *page;
|
|
size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) +
|
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
|
if (size > PAGE_SIZE)
|
goto drop;
|
|
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
|
if (!page)
|
goto drop;
|
|
head = page_address(page);
|
start = head + VETH_XDP_HEADROOM;
|
if (skb_copy_bits(skb, -mac_len, start, pktlen)) {
|
page_frag_free(head);
|
goto drop;
|
}
|
|
nskb = veth_build_skb(head,
|
VETH_XDP_HEADROOM + mac_len, skb->len,
|
PAGE_SIZE);
|
if (!nskb) {
|
page_frag_free(head);
|
goto drop;
|
}
|
|
skb_copy_header(nskb, skb);
|
head_off = skb_headroom(nskb) - skb_headroom(skb);
|
skb_headers_offset_update(nskb, head_off);
|
consume_skb(skb);
|
skb = nskb;
|
}
|
|
xdp.data_hard_start = skb->head;
|
xdp.data = skb_mac_header(skb);
|
xdp.data_end = xdp.data + pktlen;
|
xdp.data_meta = xdp.data;
|
xdp.rxq = &rq->xdp_rxq;
|
orig_data = xdp.data;
|
orig_data_end = xdp.data_end;
|
|
act = bpf_prog_run_xdp(xdp_prog, &xdp);
|
|
switch (act) {
|
case XDP_PASS:
|
break;
|
case XDP_TX:
|
get_page(virt_to_page(xdp.data));
|
consume_skb(skb);
|
xdp.rxq->mem = rq->xdp_mem;
|
if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) {
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
goto err_xdp;
|
}
|
*xdp_xmit |= VETH_XDP_TX;
|
rcu_read_unlock();
|
goto xdp_xmit;
|
case XDP_REDIRECT:
|
get_page(virt_to_page(xdp.data));
|
consume_skb(skb);
|
xdp.rxq->mem = rq->xdp_mem;
|
if (xdp_do_redirect(rq->dev, &xdp, xdp_prog))
|
goto err_xdp;
|
*xdp_xmit |= VETH_XDP_REDIR;
|
rcu_read_unlock();
|
goto xdp_xmit;
|
default:
|
bpf_warn_invalid_xdp_action(act);
|
case XDP_ABORTED:
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
case XDP_DROP:
|
goto drop;
|
}
|
rcu_read_unlock();
|
|
delta = orig_data - xdp.data;
|
off = mac_len + delta;
|
if (off > 0)
|
__skb_push(skb, off);
|
else if (off < 0)
|
__skb_pull(skb, -off);
|
skb->mac_header -= delta;
|
off = xdp.data_end - orig_data_end;
|
if (off != 0)
|
__skb_put(skb, off);
|
skb->protocol = eth_type_trans(skb, rq->dev);
|
|
metalen = xdp.data - xdp.data_meta;
|
if (metalen)
|
skb_metadata_set(skb, metalen);
|
out:
|
return skb;
|
drop:
|
rcu_read_unlock();
|
kfree_skb(skb);
|
return NULL;
|
err_xdp:
|
rcu_read_unlock();
|
page_frag_free(xdp.data);
|
xdp_xmit:
|
return NULL;
|
}
|
|
static int veth_xdp_rcv(struct veth_rq *rq, int budget, unsigned int *xdp_xmit)
|
{
|
int i, done = 0;
|
|
for (i = 0; i < budget; i++) {
|
void *ptr = __ptr_ring_consume(&rq->xdp_ring);
|
struct sk_buff *skb;
|
|
if (!ptr)
|
break;
|
|
if (veth_is_xdp_frame(ptr)) {
|
skb = veth_xdp_rcv_one(rq, veth_ptr_to_xdp(ptr),
|
xdp_xmit);
|
} else {
|
skb = veth_xdp_rcv_skb(rq, ptr, xdp_xmit);
|
}
|
|
if (skb)
|
napi_gro_receive(&rq->xdp_napi, skb);
|
|
done++;
|
}
|
|
return done;
|
}
|
|
static int veth_poll(struct napi_struct *napi, int budget)
|
{
|
struct veth_rq *rq =
|
container_of(napi, struct veth_rq, xdp_napi);
|
unsigned int xdp_xmit = 0;
|
int done;
|
|
xdp_set_return_frame_no_direct();
|
done = veth_xdp_rcv(rq, budget, &xdp_xmit);
|
|
if (done < budget && napi_complete_done(napi, done)) {
|
/* Write rx_notify_masked before reading ptr_ring */
|
smp_store_mb(rq->rx_notify_masked, false);
|
if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) {
|
if (napi_schedule_prep(&rq->xdp_napi)) {
|
WRITE_ONCE(rq->rx_notify_masked, true);
|
__napi_schedule(&rq->xdp_napi);
|
}
|
}
|
}
|
|
if (xdp_xmit & VETH_XDP_TX)
|
veth_xdp_flush(rq->dev);
|
if (xdp_xmit & VETH_XDP_REDIR)
|
xdp_do_flush_map();
|
xdp_clear_return_frame_no_direct();
|
|
return done;
|
}
|
|
static int veth_napi_add(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
int err, i;
|
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
struct veth_rq *rq = &priv->rq[i];
|
|
err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL);
|
if (err)
|
goto err_xdp_ring;
|
}
|
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
struct veth_rq *rq = &priv->rq[i];
|
|
netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT);
|
napi_enable(&rq->xdp_napi);
|
}
|
|
return 0;
|
err_xdp_ring:
|
for (i--; i >= 0; i--)
|
ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free);
|
|
return err;
|
}
|
|
static void veth_napi_del(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
int i;
|
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
struct veth_rq *rq = &priv->rq[i];
|
|
napi_disable(&rq->xdp_napi);
|
napi_hash_del(&rq->xdp_napi);
|
}
|
synchronize_net();
|
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
struct veth_rq *rq = &priv->rq[i];
|
|
netif_napi_del(&rq->xdp_napi);
|
rq->rx_notify_masked = false;
|
ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free);
|
}
|
}
|
|
static int veth_enable_xdp(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
int err, i;
|
|
if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) {
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
struct veth_rq *rq = &priv->rq[i];
|
|
err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i);
|
if (err < 0)
|
goto err_rxq_reg;
|
|
err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,
|
MEM_TYPE_PAGE_SHARED,
|
NULL);
|
if (err < 0)
|
goto err_reg_mem;
|
|
/* Save original mem info as it can be overwritten */
|
rq->xdp_mem = rq->xdp_rxq.mem;
|
}
|
|
err = veth_napi_add(dev);
|
if (err)
|
goto err_rxq_reg;
|
}
|
|
for (i = 0; i < dev->real_num_rx_queues; i++)
|
rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog);
|
|
return 0;
|
err_reg_mem:
|
xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq);
|
err_rxq_reg:
|
for (i--; i >= 0; i--)
|
xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq);
|
|
return err;
|
}
|
|
static void veth_disable_xdp(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
int i;
|
|
for (i = 0; i < dev->real_num_rx_queues; i++)
|
rcu_assign_pointer(priv->rq[i].xdp_prog, NULL);
|
veth_napi_del(dev);
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
struct veth_rq *rq = &priv->rq[i];
|
|
rq->xdp_rxq.mem = rq->xdp_mem;
|
xdp_rxq_info_unreg(&rq->xdp_rxq);
|
}
|
}
|
|
static int veth_open(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
int err;
|
|
if (!peer)
|
return -ENOTCONN;
|
|
if (priv->_xdp_prog) {
|
err = veth_enable_xdp(dev);
|
if (err)
|
return err;
|
}
|
|
if (peer->flags & IFF_UP) {
|
netif_carrier_on(dev);
|
netif_carrier_on(peer);
|
}
|
|
return 0;
|
}
|
|
static int veth_close(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
|
netif_carrier_off(dev);
|
if (peer)
|
netif_carrier_off(peer);
|
|
if (priv->_xdp_prog)
|
veth_disable_xdp(dev);
|
|
return 0;
|
}
|
|
static int is_valid_veth_mtu(int mtu)
|
{
|
return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
|
}
|
|
static int veth_alloc_queues(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
int i;
|
|
priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL);
|
if (!priv->rq)
|
return -ENOMEM;
|
|
for (i = 0; i < dev->num_rx_queues; i++)
|
priv->rq[i].dev = dev;
|
|
return 0;
|
}
|
|
static void veth_free_queues(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
|
kfree(priv->rq);
|
}
|
|
static int veth_dev_init(struct net_device *dev)
|
{
|
int err;
|
|
dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
|
if (!dev->vstats)
|
return -ENOMEM;
|
|
err = veth_alloc_queues(dev);
|
if (err) {
|
free_percpu(dev->vstats);
|
return err;
|
}
|
|
return 0;
|
}
|
|
static void veth_dev_free(struct net_device *dev)
|
{
|
veth_free_queues(dev);
|
free_percpu(dev->vstats);
|
}
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
static void veth_poll_controller(struct net_device *dev)
|
{
|
/* veth only receives frames when its peer sends one
|
* Since it has nothing to do with disabling irqs, we are guaranteed
|
* never to have pending data when we poll for it so
|
* there is nothing to do here.
|
*
|
* We need this though so netpoll recognizes us as an interface that
|
* supports polling, which enables bridge devices in virt setups to
|
* still use netconsole
|
*/
|
}
|
#endif /* CONFIG_NET_POLL_CONTROLLER */
|
|
static int veth_get_iflink(const struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer;
|
int iflink;
|
|
rcu_read_lock();
|
peer = rcu_dereference(priv->peer);
|
iflink = peer ? peer->ifindex : 0;
|
rcu_read_unlock();
|
|
return iflink;
|
}
|
|
static netdev_features_t veth_fix_features(struct net_device *dev,
|
netdev_features_t features)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer;
|
|
peer = rtnl_dereference(priv->peer);
|
if (peer) {
|
struct veth_priv *peer_priv = netdev_priv(peer);
|
|
if (peer_priv->_xdp_prog)
|
features &= ~NETIF_F_GSO_SOFTWARE;
|
}
|
|
return features;
|
}
|
|
static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
|
{
|
struct veth_priv *peer_priv, *priv = netdev_priv(dev);
|
struct net_device *peer;
|
|
if (new_hr < 0)
|
new_hr = 0;
|
|
rcu_read_lock();
|
peer = rcu_dereference(priv->peer);
|
if (unlikely(!peer))
|
goto out;
|
|
peer_priv = netdev_priv(peer);
|
priv->requested_headroom = new_hr;
|
new_hr = max(priv->requested_headroom, peer_priv->requested_headroom);
|
dev->needed_headroom = new_hr;
|
peer->needed_headroom = new_hr;
|
|
out:
|
rcu_read_unlock();
|
}
|
|
static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
|
struct netlink_ext_ack *extack)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct bpf_prog *old_prog;
|
struct net_device *peer;
|
unsigned int max_mtu;
|
int err;
|
|
old_prog = priv->_xdp_prog;
|
priv->_xdp_prog = prog;
|
peer = rtnl_dereference(priv->peer);
|
|
if (prog) {
|
if (!peer) {
|
NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached");
|
err = -ENOTCONN;
|
goto err;
|
}
|
|
max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM -
|
peer->hard_header_len -
|
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
|
if (peer->mtu > max_mtu) {
|
NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP");
|
err = -ERANGE;
|
goto err;
|
}
|
|
if (dev->real_num_rx_queues < peer->real_num_tx_queues) {
|
NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues");
|
err = -ENOSPC;
|
goto err;
|
}
|
|
if (dev->flags & IFF_UP) {
|
err = veth_enable_xdp(dev);
|
if (err) {
|
NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed");
|
goto err;
|
}
|
}
|
|
if (!old_prog) {
|
peer->hw_features &= ~NETIF_F_GSO_SOFTWARE;
|
peer->max_mtu = max_mtu;
|
}
|
}
|
|
if (old_prog) {
|
if (!prog) {
|
if (dev->flags & IFF_UP)
|
veth_disable_xdp(dev);
|
|
if (peer) {
|
peer->hw_features |= NETIF_F_GSO_SOFTWARE;
|
peer->max_mtu = ETH_MAX_MTU;
|
}
|
}
|
bpf_prog_put(old_prog);
|
}
|
|
if ((!!old_prog ^ !!prog) && peer)
|
netdev_update_features(peer);
|
|
return 0;
|
err:
|
priv->_xdp_prog = old_prog;
|
|
return err;
|
}
|
|
static u32 veth_xdp_query(struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
const struct bpf_prog *xdp_prog;
|
|
xdp_prog = priv->_xdp_prog;
|
if (xdp_prog)
|
return xdp_prog->aux->id;
|
|
return 0;
|
}
|
|
static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
|
{
|
switch (xdp->command) {
|
case XDP_SETUP_PROG:
|
return veth_xdp_set(dev, xdp->prog, xdp->extack);
|
case XDP_QUERY_PROG:
|
xdp->prog_id = veth_xdp_query(dev);
|
return 0;
|
default:
|
return -EINVAL;
|
}
|
}
|
|
static const struct net_device_ops veth_netdev_ops = {
|
.ndo_init = veth_dev_init,
|
.ndo_open = veth_open,
|
.ndo_stop = veth_close,
|
.ndo_start_xmit = veth_xmit,
|
.ndo_get_stats64 = veth_get_stats64,
|
.ndo_set_rx_mode = veth_set_multicast_list,
|
.ndo_set_mac_address = eth_mac_addr,
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
.ndo_poll_controller = veth_poll_controller,
|
#endif
|
.ndo_get_iflink = veth_get_iflink,
|
.ndo_fix_features = veth_fix_features,
|
.ndo_features_check = passthru_features_check,
|
.ndo_set_rx_headroom = veth_set_rx_headroom,
|
.ndo_bpf = veth_xdp,
|
.ndo_xdp_xmit = veth_xdp_xmit,
|
};
|
|
#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
|
NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \
|
NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \
|
NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
|
NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
|
|
static void veth_setup(struct net_device *dev)
|
{
|
ether_setup(dev);
|
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
|
dev->priv_flags |= IFF_NO_QUEUE;
|
dev->priv_flags |= IFF_PHONY_HEADROOM;
|
|
dev->netdev_ops = &veth_netdev_ops;
|
dev->ethtool_ops = &veth_ethtool_ops;
|
dev->features |= NETIF_F_LLTX;
|
dev->features |= VETH_FEATURES;
|
dev->vlan_features = dev->features &
|
~(NETIF_F_HW_VLAN_CTAG_TX |
|
NETIF_F_HW_VLAN_STAG_TX |
|
NETIF_F_HW_VLAN_CTAG_RX |
|
NETIF_F_HW_VLAN_STAG_RX);
|
dev->needs_free_netdev = true;
|
dev->priv_destructor = veth_dev_free;
|
dev->max_mtu = ETH_MAX_MTU;
|
|
dev->hw_features = VETH_FEATURES;
|
dev->hw_enc_features = VETH_FEATURES;
|
dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
|
}
|
|
/*
|
* netlink interface
|
*/
|
|
static int veth_validate(struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
if (tb[IFLA_ADDRESS]) {
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
return -EINVAL;
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
return -EADDRNOTAVAIL;
|
}
|
if (tb[IFLA_MTU]) {
|
if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
|
return -EINVAL;
|
}
|
return 0;
|
}
|
|
static struct rtnl_link_ops veth_link_ops;
|
|
static int veth_newlink(struct net *src_net, struct net_device *dev,
|
struct nlattr *tb[], struct nlattr *data[],
|
struct netlink_ext_ack *extack)
|
{
|
int err;
|
struct net_device *peer;
|
struct veth_priv *priv;
|
char ifname[IFNAMSIZ];
|
struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
|
unsigned char name_assign_type;
|
struct ifinfomsg *ifmp;
|
struct net *net;
|
|
/*
|
* create and register peer first
|
*/
|
if (data != NULL && data[VETH_INFO_PEER] != NULL) {
|
struct nlattr *nla_peer;
|
|
nla_peer = data[VETH_INFO_PEER];
|
ifmp = nla_data(nla_peer);
|
err = rtnl_nla_parse_ifla(peer_tb,
|
nla_data(nla_peer) + sizeof(struct ifinfomsg),
|
nla_len(nla_peer) - sizeof(struct ifinfomsg),
|
NULL);
|
if (err < 0)
|
return err;
|
|
err = veth_validate(peer_tb, NULL, extack);
|
if (err < 0)
|
return err;
|
|
tbp = peer_tb;
|
} else {
|
ifmp = NULL;
|
tbp = tb;
|
}
|
|
if (ifmp && tbp[IFLA_IFNAME]) {
|
nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
|
name_assign_type = NET_NAME_USER;
|
} else {
|
snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
|
name_assign_type = NET_NAME_ENUM;
|
}
|
|
net = rtnl_link_get_net(src_net, tbp);
|
if (IS_ERR(net))
|
return PTR_ERR(net);
|
|
peer = rtnl_create_link(net, ifname, name_assign_type,
|
&veth_link_ops, tbp);
|
if (IS_ERR(peer)) {
|
put_net(net);
|
return PTR_ERR(peer);
|
}
|
|
if (!ifmp || !tbp[IFLA_ADDRESS])
|
eth_hw_addr_random(peer);
|
|
if (ifmp && (dev->ifindex != 0))
|
peer->ifindex = ifmp->ifi_index;
|
|
peer->gso_max_size = dev->gso_max_size;
|
peer->gso_max_segs = dev->gso_max_segs;
|
|
err = register_netdevice(peer);
|
put_net(net);
|
net = NULL;
|
if (err < 0)
|
goto err_register_peer;
|
|
netif_carrier_off(peer);
|
|
err = rtnl_configure_link(peer, ifmp);
|
if (err < 0)
|
goto err_configure_peer;
|
|
/*
|
* register dev last
|
*
|
* note, that since we've registered new device the dev's name
|
* should be re-allocated
|
*/
|
|
if (tb[IFLA_ADDRESS] == NULL)
|
eth_hw_addr_random(dev);
|
|
if (tb[IFLA_IFNAME])
|
nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
|
else
|
snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
|
|
err = register_netdevice(dev);
|
if (err < 0)
|
goto err_register_dev;
|
|
netif_carrier_off(dev);
|
|
/*
|
* tie the deviced together
|
*/
|
|
priv = netdev_priv(dev);
|
rcu_assign_pointer(priv->peer, peer);
|
|
priv = netdev_priv(peer);
|
rcu_assign_pointer(priv->peer, dev);
|
|
return 0;
|
|
err_register_dev:
|
/* nothing to do */
|
err_configure_peer:
|
unregister_netdevice(peer);
|
return err;
|
|
err_register_peer:
|
free_netdev(peer);
|
return err;
|
}
|
|
static void veth_dellink(struct net_device *dev, struct list_head *head)
|
{
|
struct veth_priv *priv;
|
struct net_device *peer;
|
|
priv = netdev_priv(dev);
|
peer = rtnl_dereference(priv->peer);
|
|
/* Note : dellink() is called from default_device_exit_batch(),
|
* before a rcu_synchronize() point. The devices are guaranteed
|
* not being freed before one RCU grace period.
|
*/
|
RCU_INIT_POINTER(priv->peer, NULL);
|
unregister_netdevice_queue(dev, head);
|
|
if (peer) {
|
priv = netdev_priv(peer);
|
RCU_INIT_POINTER(priv->peer, NULL);
|
unregister_netdevice_queue(peer, head);
|
}
|
}
|
|
static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
|
[VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
|
};
|
|
static struct net *veth_get_link_net(const struct net_device *dev)
|
{
|
struct veth_priv *priv = netdev_priv(dev);
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
|
return peer ? dev_net(peer) : dev_net(dev);
|
}
|
|
static struct rtnl_link_ops veth_link_ops = {
|
.kind = DRV_NAME,
|
.priv_size = sizeof(struct veth_priv),
|
.setup = veth_setup,
|
.validate = veth_validate,
|
.newlink = veth_newlink,
|
.dellink = veth_dellink,
|
.policy = veth_policy,
|
.maxtype = VETH_INFO_MAX,
|
.get_link_net = veth_get_link_net,
|
};
|
|
/*
|
* init/fini
|
*/
|
|
static __init int veth_init(void)
|
{
|
return rtnl_link_register(&veth_link_ops);
|
}
|
|
static __exit void veth_exit(void)
|
{
|
rtnl_link_unregister(&veth_link_ops);
|
}
|
|
module_init(veth_init);
|
module_exit(veth_exit);
|
|
MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
|
MODULE_LICENSE("GPL v2");
|
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
|
