net: dsa: tag_ocelot_8021q: calculate TX checksum in software for deferred packets

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DSA inherits NETIF_F_CSUM_MASK from master->vlan_features, and the
expectation is that TX checksumming is offloaded and not done in
software.

Normally the DSA master takes care of this, but packets handled by
ocelot_defer_xmit() are a very special exception, because they are
actually injected into the switch through register-based MMIO. So the
DSA master is not involved at all for these packets => no one calculates
the checksum.

This allows PTP over UDP to work using the ocelot-8021q tagging
protocol.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Vladimir Oltean 2022-02-16 16:30:14 +02:00 • committed by David S. Miller

parent 9934800436

commit 29940ce32a

1 changed files with 7 additions and 0 deletions

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net/dsa/tag_ocelot_8021q.c

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