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net: Disable GRO_HW when generic XDP is installed on a device.

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Hardware should not aggregate any packets when generic XDP is installed.

Cc: Ariel Elior <Ariel.Elior@cavium.com>
Cc: everest-linux-l2@cavium.com
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2017-12-16 03:09:41 -05:00 committed by David S. Miller
parent fb1f5f79ae
commit 56f5aa77cd
1 changed files with 18 additions and 0 deletions
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18
net/core/dev.c
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@ -1542,6 +1542,23 @@ void dev_disable_lro(struct net_device *dev)
}
EXPORT_SYMBOL(dev_disable_lro);
/**
* dev_disable_gro_hw - disable HW Generic Receive Offload on a device
* @dev: device
*
* Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be
* called under RTNL. This is needed if Generic XDP is installed on
* the device.
*/
static void dev_disable_gro_hw(struct net_device *dev)
{
dev->wanted_features &= ~NETIF_F_GRO_HW;
netdev_update_features(dev);
if (unlikely(dev->features & NETIF_F_GRO_HW))
netdev_WARN(dev, "failed to disable GRO_HW!\n");
}
static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
struct net_device *dev)
{
@ -4564,6 +4581,7 @@ static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
} else if (new && !old) {
static_key_slow_inc(&generic_xdp_needed);
dev_disable_lro(dev);
dev_disable_gro_hw(dev);
}
break;