This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'. If the problem still exists, change
the tag 'verification-needed-vivid' to 'verification-failed-vivid'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-vivid

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https://bugs.launchpad.net/bugs/1636656

Title:
  [Hyper-V] netvsc: fix incorrect receive checksum offloading

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Committed

Bug description:
  The Hyper-V netvsc driver was looking at the incorrect status bits
  in the checksum info. It was setting the receive checksum unnecessary
  flag based on the IP header checksum being correct. The checksum
  flag is skb is about TCP and UDP checksum status. Because of this
  bug, any packet received with bad TCP checksum would be passed
  up the stack and to the application causing data corruption.
  The problem is reproducible via netcat and netem.

  This had a side effect of not doing receive checksum offload
  on IPv6. The driver was also also always doing checksum offload
  independent of the checksum setting done via ethtool.

  Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>

  https://patchwork.ozlabs.org/patch/685660/

  When this patch is committed I will include the commit ID in this bug.

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