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Revert "veth: Avoid drop packets when xdp_redirect performs"

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This reverts commit 2e0de6366a.

Based on the issues reported by John and Paolo and their comments,
this patch and the corresponding fix 5e5dc33d5d are reverted, and
we'll remake it.

Signed-off-by: Heng Qi <hengqi@linux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Heng Qi 2022-11-22 11:50:15 +08:00 committed by Jakub Kicinski
parent b535d681ad
commit 5e8d3dc73e
1 changed files with 13 additions and 77 deletions
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90
drivers/net/veth.c
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@ -1119,14 +1119,10 @@ static void veth_disable_xdp_range(struct net_device *dev, int start, int end,
static int veth_enable_xdp(struct net_device *dev)
{
bool napi_already_on = veth_gro_requested(dev) && (dev->flags & IFF_UP);
struct veth_priv *priv = netdev_priv(dev);
bool napi_already_on;
struct veth_rq *rq;
int err, i;
rq = &priv->rq[0];
napi_already_on = (dev->flags & IFF_UP) && rcu_access_pointer(rq->napi);
if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) {
err = veth_enable_xdp_range(dev, 0, dev->real_num_rx_queues, napi_already_on);
if (err)
@ -1327,28 +1323,18 @@ revert:
static int veth_open(struct net_device *dev)
{
struct veth_priv *peer_priv, *priv = netdev_priv(dev);
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
struct veth_rq *peer_rq;
int err;
if (!peer)
return -ENOTCONN;
peer_priv = netdev_priv(peer);
peer_rq = &peer_priv->rq[0];
if (priv->_xdp_prog) {
err = veth_enable_xdp(dev);
if (err)
return err;
/* refer to the logic in veth_xdp_set() */
if (!rtnl_dereference(peer_rq->napi)) {
err = veth_napi_enable(peer);
if (err)
return err;
}
} else if (veth_gro_requested(dev) || peer_priv->_xdp_prog) {
} else if (veth_gro_requested(dev)) {
err = veth_napi_enable(dev);
if (err)
return err;
@ -1364,30 +1350,18 @@ static int veth_open(struct net_device *dev)
static int veth_close(struct net_device *dev)
{
struct veth_priv *peer_priv, *priv = netdev_priv(dev);
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
struct veth_rq *peer_rq;
netif_carrier_off(dev);
if (peer) {
peer_priv = netdev_priv(peer);
peer_rq = &peer_priv->rq[0];
}
if (priv->_xdp_prog) {
veth_disable_xdp(dev);
/* refer to the logic in veth_xdp_set */
if (peer && rtnl_dereference(peer_rq->napi)) {
if (!veth_gro_requested(peer) && !peer_priv->_xdp_prog)
veth_napi_del(peer);
}
} else if (veth_gro_requested(dev) || (peer && peer_priv->_xdp_prog)) {
veth_napi_del(dev);
}
if (peer)
netif_carrier_off(peer);
if (priv->_xdp_prog)
veth_disable_xdp(dev);
else if (veth_gro_requested(dev))
veth_napi_del(dev);
return 0;
}
@ -1496,21 +1470,17 @@ static int veth_set_features(struct net_device *dev,
{
netdev_features_t changed = features ^ dev->features;
struct veth_priv *priv = netdev_priv(dev);
struct veth_rq *rq = &priv->rq[0];
int err;
if (!(changed & NETIF_F_GRO) || !(dev->flags & IFF_UP) || priv->_xdp_prog)
return 0;
if (features & NETIF_F_GRO) {
if (!rtnl_dereference(rq->napi)) {
err = veth_napi_enable(dev);
if (err)
return err;
}
err = veth_napi_enable(dev);
if (err)
return err;
} else {
if (rtnl_dereference(rq->napi))
veth_napi_del(dev);
veth_napi_del(dev);
}
return 0;
}
@ -1542,19 +1512,14 @@ 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 veth_priv *peer_priv;
struct bpf_prog *old_prog;
struct veth_rq *peer_rq;
struct net_device *peer;
bool napi_already_off;
unsigned int max_mtu;
bool noreq_napi;
int err;
old_prog = priv->_xdp_prog;
priv->_xdp_prog = prog;
peer = rtnl_dereference(priv->peer);
peer_priv = netdev_priv(peer);
if (prog) {
if (!peer) {
@ -1591,24 +1556,6 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
}
}
if (peer && (peer->flags & IFF_UP)) {
peer_rq = &peer_priv->rq[0];
/* If the peer hasn't enabled GRO and loaded xdp,
* then we enable napi automatically if its napi
* is not ready.
*/
napi_already_off = !rtnl_dereference(peer_rq->napi);
if (napi_already_off) {
err = veth_napi_enable(peer);
if (err) {
NL_SET_ERR_MSG_MOD(extack,
"Failed to automatically enable napi of peer");
goto err;
}
}
}
if (!old_prog) {
peer->hw_features &= ~NETIF_F_GSO_SOFTWARE;
peer->max_mtu = max_mtu;
@ -1623,17 +1570,6 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
if (peer) {
peer->hw_features |= NETIF_F_GSO_SOFTWARE;
peer->max_mtu = ETH_MAX_MTU;
peer_rq = &peer_priv->rq[0];
/* If the peer doesn't has its xdp and enabled
* GRO, then we disable napi if its napi is ready;
*/
if (rtnl_dereference(peer_rq->napi)) {
noreq_napi = !veth_gro_requested(peer) &&
!peer_priv->_xdp_prog;
if (noreq_napi && (peer->flags & IFF_UP))
veth_napi_del(peer);
}
}
}
bpf_prog_put(old_prog);