[ovs-git] Open vSwitch: datapath: Fix WARN_ON sending GSO packets to userspace in Linux 2.6.22+. (master)

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- Log -----------------------------------------------------------------
commit cb5087caddd187e71d5f32118d8d807c9c131725
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=cb5087caddd187e71d5f32118d8d807c9c131725
Author: Ben Pfaff <blp at nicira.com>
		
datapath: Fix WARN_ON sending GSO packets to userspace in Linux 2.6.22+.
		
Until now, when dp_output_control() queued a GSO packet to userspace, it
would first compute the checksum for the whole GSO packet, then break the
packet into segments.  However this had two drawbacks:

    1. The checksum had to be recomputed for each segment, wasting time.
    2. Linux 2.6.22 and later would emit a warning in skb_gso_segment()
       because the checksum was precomputed.

This commit changes dp_output_control() to instead break the packet into
segments, then compute the checksum across each of the segments
individually.  This fixes both drawbacks.

This commit has seen light testing on Xen's 2.6.27.  It has been build
tested on a few different kernel versions.


commit 0d3b8a34d6eabf049ae7e2d5689a0e687495100d
Diffs: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=commitdiff;h=0d3b8a34d6eabf049ae7e2d5689a0e687495100d
Author: Ben Pfaff <blp at nicira.com>
		
datapath: Fix comments.
		


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Summary of changes:
 datapath/datapath.c |  157 +++++++++++++++++++++++++++------------------------
 datapath/datapath.h |    1 -
 2 files changed, 84 insertions(+), 74 deletions(-)


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