[PATCH net-next,v2,1/1] hv_netvsc: use per_cpu stats to calculate TX/RX data

[David Miller]

From: Simon Xiao <sixiao at microsoft.com>
Date: Thu, 14 May 2015 01:00:25 -0700

> Current code does not lock anything when calculating the TX and RX stats.
> As a result, the RX and TX data reported by ifconfig are not accuracy in a
> system with high network throughput and multiple CPUs (in my test,
> RX/TX = 83% between 2 HyperV VM nodes which have 8 vCPUs and 40G Ethernet).
> 
> This patch fixed the above issue by using per_cpu stats.
> netvsc_get_stats64() summarizes TX and RX data by iterating over all CPUs
> to get their respective stats.
> 
> This v2 patch addressed David's comments on the cleanup path when
> netdev_alloc_pcpu_stats() failed.
> 
> Signed-off-by: Simon Xiao <sixiao at microsoft.com>
> Reviewed-by: K. Y. Srinivasan <kys at microsoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz at microsoft.com>

Applied, thanks.