vlan: lockless transmit path
vlan is a stacked device, like tunnels. We should use the lockless mechanism we are using in tunnels and loopback. This patch completely removes locking in TX path. tx stat counters are added into existing percpu stat structure, renamed from vlan_rx_stats to vlan_pcpu_stats. Note : this partially reverts commit 2e59af3d (vlan: multiqueue vlan device) Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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