* net: Loosen constraints for recalculating checksum in skb_segment()
@ 2013-12-26 7:18 Timo Teras
0 siblings, 0 replies; only message in thread
From: Timo Teras @ 2013-12-26 7:18 UTC (permalink / raw)
To: David Miller; +Cc: Simon Horman, netdev
commit 1cdbcb7957cf9e5f841dbcde9b38fd18a804208b
Author: Simon Horman <horms@verge.net.au>
Date: Sun May 19 15:46:49 2013 +0000
> net: Loosen constraints for recalculating checksum in skb_segment()
>
> This is a generic solution to resolve a specific problem that I have
> observed.
>
> If the encapsulation of an skb changes then ability to offload
> checksums may also change. In particular it may be necessary to
> perform checksumming in software.
>
> An example of such a case is where a non-GRE packet is received but
> is to be encapsulated and transmitted as GRE.
Dave, can you queue this for 3.10-stable.
It was around 3.9 when ip_gre got gso support. This added the bug that
forwarding non-gre to gre with gro+gso+tx offloads enabled does not
work properly - the TCP checksums are not calculated properly without
this patch.
Thanks,
Timo
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