path: root/drivers
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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-22 10:22:17 -0700
committerDavid S. Miller <davem@davemloft.net>2010-06-23 12:59:47 -0700
commit16b8a4761cbe5082cd35641c066d7c4b6b83cdca (patch)
tree1721b297633a798beb166a4c8778edb1a8a474ad /drivers
parentnet: consolidate netif_needs_gso() checks (diff)
net: Introduce u64_stats_sync infrastructure
To properly implement 64bits network statistics on 32bit or 64bit hosts, we provide one new type and four methods, to ease conversions. Stats producer should use following template granted it already got an exclusive access to counters (include/linux/u64_stats_sync.h contains some documentation about details) u64_stats_update_begin(&stats->syncp); stats->bytes64 += len; stats->packets64++; u64_stats_update_end(&stats->syncp); While a consumer should use following template to get consistent snapshot : u64 tbytes, tpackets; unsigned int start; do { start = u64_stats_fetch_begin(&stats->syncp); tbytes = stats->bytes64; tpackets = stats->packets64; } while (u64_stats_fetch_retry(&stats->lock, syncp)); Suggested by David Miller, and comments courtesy of Nick Piggin. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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