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Subject: Re: Errors using span interface on if_bridge(4)
From: hiren panchasara <hiren.panchasara@gmail.com>
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On Sat, Feb 1, 2014 at 5:16 PM, hiren panchasara
<hiren.panchasara@gmail.com> wrote:

>
> -bash-4.2$ sysctl -a | grep mac_stats.checksum_errs
> dev.ix.0.mac_stats.checksum_errs: 0
> dev.ix.1.mac_stats.checksum_errs: 0
> dev.ix.2.mac_stats.checksum_errs: 0
> dev.ix.3.mac_stats.checksum_errs: 3371119  <-- most of them fail checksum

In ixgbe.c :
ixgbe_add_hw_stats() has
         SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "checksum_errs",
                         CTLFLAG_RD, &stats->xec,
                         "Checksum Errors");

which is updated in ixgbe_update_stats_counters()
adapter->stats.xec += IXGBE_READ_REG(hw, IXGBE_XEC);

ixgbe_type.h defines
#define IXGBE_XEC               0x04120

So, this is something that firmware of the card updates? We just read
that register from drivers.

How do I know why this number is increasing?

cheers,
Hiren