Eric Dumazet 7f5c6d4f66
netfilter: get rid of atomic ops in fast path ...
We currently use a percpu spinlock to 'protect' rule bytes/packets
counters, after various attempts to use RCU instead.
Lately we added a seqlock so that get_counters() can run without
blocking BH or 'writers'. But we really only need the seqcount in it.
Spinlock itself is only locked by the current/owner cpu, so we can
remove it completely.
This cleanups api, using correct 'writer' vs 'reader' semantic.
At replace time, the get_counters() call makes sure all cpus are done
using the old table.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com >
Cc: Jan Engelhardt <jengelh@medozas.de >
Signed-off-by: Patrick McHardy <kaber@trash.net >
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