Merge branch 'sctp-gso'

Marcelo Ricardo Leitner says:

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sctp: Add GSO support

This patchset adds sctp GSO support.

Performance tests indicates that increases throughput by 10% if using
bigger chunk sizes, specially if bigger than MTU. For small chunks, it
doesn't help much if not using heavy firewall rules.

For small chunks it will probably be of more use once we get something
like MSG_MORE as David Laight had suggested.

overall changes:
v1->v2:
Added support for receiving GSO frames on SCTP stack, as requested by
Dave Miller.

v2->v3:
Consider sctphdr size in skb_gso_transport_seglen()
rebased due to 5c7cdf339af5 ("gso: Remove arbitrary checks for
unsupported GSO")
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Signed-off-by: David S. Miller <davem@davemloft.net>