If you stop, then start a port that had already received some packets,
the NIC could fetch discriptors from the wrong location. This could
effectivly reduce the size of the Rx queue by a random amount and
cause packet drop or reduced performance.
Reset the NIC fetch index to 0 when allocating and posting mbuf
addresses to the NIC.
Fixes: 947d860c821f ("enic: improve Rx performance")
Signed-off-by: John Daley <johndale@cisco.com>
Reviewed-by: Nelson Escobar <neescoba@cisco.com>
04f976899f