macsec: Fix traffic counters/statistics

[ Upstream commit 91ec9bd57f3524ff3d86bfb7c9ee5a315019733c ]

OutOctetsProtected, OutOctetsEncrypted, InOctetsValidated, and
InOctetsDecrypted were incrementing by the total number of octets in frames
instead of by the number of octets of User Data in frames.

The Controlled Port statistics ifOutOctets and ifInOctets were incrementing
by the total number of octets instead of the number of octets of the MSDUs
plus octets of the destination and source MAC addresses.

The Controlled Port statistics ifInDiscards and ifInErrors were not
incrementing each time the counters they aggregate were.

The Controlled Port statistic ifInErrors was not included in the output of
macsec_get_stats64 so the value was not present in ip commands output.

The ReceiveSA counters InPktsNotValid, InPktsNotUsingSA, and InPktsUnusedSA
were not incrementing.

Signed-off-by: Clayton Yager <Clayton_Yager@selinc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: ff672b9ffeb3 ("ipvlan: properly track tx_errors")
Signed-off-by: Sasha Levin <sashal@kernel.org>