tun: don't require serialization lock on tx

The current tun_net_xmit() implementation don't need any external
lock since it relies on rcu protection for the tun data structure
and on socket queue lock for skb queuing.

This patch set the NETIF_F_LLTX feature bit in the tun device, so
that on xmit, in absence of qdisc, no serialization lock is acquired
by the caller.

The user space can remove the default tun qdisc with:

tc qdisc replace dev <tun device name> root noqueue

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index faf9297db2cf2c2b8a21aaf25151f9e3e42b0689..42992dcbdda87387def69d261516c1a9806921d1 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1796,7 +1796,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
                dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
                                   TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
                                   NETIF_F_HW_VLAN_STAG_TX;
-               dev->features = dev->hw_features;
+               dev->features = dev->hw_features | NETIF_F_LLTX;
                dev->vlan_features = dev->features &
                                     ~(NETIF_F_HW_VLAN_CTAG_TX |
                                       NETIF_F_HW_VLAN_STAG_TX);