tun: use per cpu variables for stats accounting

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Currently the tun device accounting uses dev->stats without applying any
kind of protection, regardless that accounting happens in preemptible
process context.
This patch move the tun stats to a per cpu data structure, and protect
the updates with  u64_stats_update_begin()/u64_stats_update_end() or
this_cpu_inc according to the stat type. The per cpu stats are
aggregated by the newly added ndo_get_stats64 ops.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Paolo Abeni 2016-04-13 10:52:20 +02:00 • committed by David S. Miller

parent 548aacdd74

commit 608b997726

1 changed files with 83 additions and 12 deletions

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95

drivers/net/tun.c

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