ipvs: reorganize tot_stats
The global tot_stats contains cpustats field just like the stats for dest and svc, so better use it to simplify the usage in estimation_timer. As tot_stats is registered as estimator we can remove the special ip_vs_read_cpu_stats call for tot_stats. Fix ip_vs_read_cpu_stats to be called under stats lock because it is still used as synchronization between estimation timer and user context (the stats readers). Also, make sure ip_vs_stats_percpu_show reads properly the u64 stats from user context. Signed-off-by: NJulian Anastasov <ja@ssi.bg> Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NSimon Horman <horms@verge.net.au>
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