From: Alexander Sverdlin <alexander.sverd...@nokia.com> Date: Fri, 13 Jul 2018 17:31:50 +0200
> From: Alexander Sverdlin <alexander.sverd...@nsn.com> > > octeon_mgmt driver doesn't drop RX frames that are 1-4 bytes bigger than > MTU set for the corresponding interface. The problem is in the > AGL_GMX_RX0/1_FRM_MAX register setting, which should not account for VLAN > tagging. > > According to Octeon HW manual: > "For tagged frames, MAX increases by four bytes for each VLAN found up to a > maximum of two VLANs, or MAX + 8 bytes." > > OCTEON_FRAME_HEADER_LEN "define" is fine for ring buffer management, but > should not be used for AGL_GMX_RX0/1_FRM_MAX. > > The problem could be easily reproduced using "ping" command. If affected > system has default MTU 1500, other host (having MTU >= 1504) can > successfully "ping" the affected system with payload size 1473-1476, > resulting in IP packets of size 1501-1504 accepted by the mgmt driver. > Fixed system still accepts IP packets of 1500 bytes even with VLAN tagging, > because the limits are lifted in HW as expected, for every VLAN tag. > > Signed-off-by: Alexander Sverdlin <alexander.sverd...@nokia.com> Applied, thank you.
