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authorVladimir Oltean <vladimir.oltean@nxp.com>2020-03-10 03:28:18 +0200
committerDavid S. Miller <davem@davemloft.net>2020-03-09 18:58:17 -0700
commita8015ded89ad740d21355470d41879c5bd82aab7 (patch)
tree0a1b1598c37cc919cd29e420eac160a9694c4cc8 /net
parentipvlan: do not use cond_resched_rcu() in ipvlan_process_multicast() (diff)
downloadlinux-dev-a8015ded89ad740d21355470d41879c5bd82aab7.tar.xz
linux-dev-a8015ded89ad740d21355470d41879c5bd82aab7.zip
net: mscc: ocelot: properly account for VLAN header length when setting MRU
What the driver writes into MAC_MAXLEN_CFG does not actually represent VLAN_ETH_FRAME_LEN but instead ETH_FRAME_LEN + ETH_FCS_LEN. Yes they are numerically equal, but the difference is important, as the switch treats VLAN-tagged traffic specially and knows to increase the maximum accepted frame size automatically. So it is always wrong to account for VLAN in the MAC_MAXLEN_CFG register. Unconditionally increase the maximum allowed frame size for double-tagged traffic. Accounting for the additional length does not mean that the other VLAN membership checks aren't performed, so there's no harm done. Also, stop abusing the MTU name for configuring the MRU. There is no support for configuring the MRU on an interface at the moment. Fixes: a556c76adc05 ("net: mscc: Add initial Ocelot switch support") Fixes: fa914e9c4d94 ("net: mscc: ocelot: create a helper for changing the port MTU") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
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