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net: introduce IFF_NO_RX_HANDLER

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Some network devices - notably ipvlan slave - are not compatible with
any kind of rx_handler. Currently the hook can be installed but any
configuration (bridge, bond, macsec, ...) is nonfunctional.

This change allocates a priv_flag bit to mark such devices and explicitly
forbid installing a rx_handler if such bit is set. The new bit is used
by ipvlan slave device.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2018-03-09 10:39:24 +01:00 committed by David S. Miller
parent d185efc1da
commit f5426250a6
3 changed files with 8 additions and 0 deletions
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2
drivers/net/ipvlan/ipvlan_main.c
View file

@ -604,6 +604,8 @@ int ipvlan_link_new(struct net *src_net, struct net_device *dev,
*/
memcpy(dev->dev_addr, phy_dev->dev_addr, ETH_ALEN);
dev->priv_flags |= IFF_NO_RX_HANDLER;
err = register_netdevice(dev);
if (err < 0)
return err;

3
include/linux/netdevice.h
View file

@ -1397,6 +1397,7 @@ struct net_device_ops {
* @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
* entity (i.e. the master device for bridged veth)
* @IFF_MACSEC: device is a MACsec device
* @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook
*/
enum netdev_priv_flags {
IFF_802_1Q_VLAN = 1<<0,
@ -1425,6 +1426,7 @@ enum netdev_priv_flags {
IFF_RXFH_CONFIGURED = 1<<23,
IFF_PHONY_HEADROOM = 1<<24,
IFF_MACSEC = 1<<25,
IFF_NO_RX_HANDLER = 1<<26,
};
#define IFF_802_1Q_VLAN IFF_802_1Q_VLAN
@ -1452,6 +1454,7 @@ enum netdev_priv_flags {
#define IFF_TEAM IFF_TEAM
#define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED
#define IFF_MACSEC IFF_MACSEC
#define IFF_NO_RX_HANDLER IFF_NO_RX_HANDLER
/**
* struct net_device - The DEVICE structure.

3
net/core/dev.c
View file

@ -4351,6 +4351,9 @@ int netdev_rx_handler_register(struct net_device *dev,
if (netdev_is_rx_handler_busy(dev))
return -EBUSY;
if (dev->priv_flags & IFF_NO_RX_HANDLER)
return -EINVAL;
/* Note: rx_handler_data must be set before rx_handler */
rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
rcu_assign_pointer(dev->rx_handler, rx_handler);