From: Michal Schmidt <redacted>
Date: Fri, 25 Jun 2010 01:32:32 +0200

Most of the statistics the s2io driver provides in /proc/net/dev
it reads directly from the hardware counters. For some reason it does
not do that for rx_packets. It counts rx_packets purely in software.

A customer reported a bug where in /proc/net/dev the 'multicast' counter
was increasing faster than 'packets' ( = rx_packets in the source code).
This confuses userspace, especially snmpd.

The hardware provides a counter for the total number of received
frames (RMAC_VLD_FRMS) which the driver can use for the rx_packets
statistic. By reading both statistics from the hardware it makes sure
that all multicast frames are included in the total.

The customer tested a patch like this (only modified for RHEL5) with
S2io Inc. Xframe II 10Gbps Ethernet (rev 02)
and it fixed the problem.

Signed-off-by: Michal Schmidt <redacted>

Please also use the rmac_data_octets HW statistic for rx_bytes
otherwise rx_bytes will be out of sync with the other stats too.