dsa: mv88e6xxx: Include tagger overhead when setting MTU for DSA and CPU ports

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Same members of the Marvell Ethernet switches impose MTU restrictions
on ports used for connecting to the CPU or another switch for DSA. If
the MTU is set too low, tagged frames will be discarded. Ensure the
worst case tagger overhead is included in setting the MTU for DSA and
CPU ports.

Fixes: 1baf0fac10 ("net: dsa: mv88e6xxx: Use chip-wide max frame size for MTU")
Reported by: 曹煜 <cao88yu@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Andrew Lunn 2021-09-26 19:41:26 +02:00 • committed by David S. Miller

parent b92ce2f54c

commit b9c587fed6

2 changed files with 7 additions and 3 deletions

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9

drivers/net/dsa/mv88e6xxx/chip.c

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1

drivers/net/dsa/mv88e6xxx/chip.h

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