ibmveth: Set CHECKSUM_PARTIAL if NULL TCP CSUM.

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TCP checksums on received packets may be set to NULL by the sender if CSO
is enabled. The hypervisor flags these packets as check-sum-ok and the
skb is then flagged CHECKSUM_UNNECESSARY. If these packets are then
forwarded the sender will not request CSO due to the CHECKSUM_UNNECESSARY
flag. The result is a TCP packet sent with a bad checksum. This change
sets up CHECKSUM_PARTIAL on these packets causing the sender to correctly
request CSUM offload.

Signed-off-by: David Wilder <dwilder@us.ibm.com>
Reviewed-by: Pradeep Satyanarayana <pradeeps@linux.vnet.ibm.com>
Tested-by: Cristobal Forno <cforno12@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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David Wilder 2021-06-22 14:52:15 -07:00 • committed by David S. Miller

parent fe87797bf2

commit 7525de2516

1 changed files with 28 additions and 23 deletions

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drivers/net/ethernet/ibm/ibmveth.c

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