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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1452074

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1452074

Title:
  [Hyper-V] hv_netvsc: Eliminate memory allocation in the packet send
  path

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  K. Y. Srinivasan (2):
    hyperv: Cleanup the test for freeing skb when we use sendbuf
      mechanism
    hyperv: Eliminate memory allocation in the packet send path

   drivers/net/hyperv/hyperv_net.h | 3 +-
   drivers/net/hyperv/netvsc.c | 9 ++++-
   drivers/net/hyperv/netvsc_drv.c | 70 ++++++++++++++++++++++++++----------
   drivers/net/hyperv/rndis_filter.c | 2 +
   4 files changed, 61 insertions(+), 23 deletions(-)

  These have landed in net-next by David Miller

  https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=3271e4f18d9a4ec9ac5568f94444dac08f29c5a0
  https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=b08cc79155fc26d0d112b1470d1ece5034651a4b
  https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=cbacec76bcd03ff21b37ac331e652b5a8f3ea644

  Patch to a patch ->

  Commit b08cc79155fc26d0d112b1470d1ece5034651a4b eliminated memory
  allocation in the packet send path:

      "hv_netvsc: Eliminate memory allocation in the packet send path

      The network protocol used to communicate with the host is the remote ndis (rndis)
      protocol. We need to decorate each outgoing packet with a rndis header and
      additional rndis state (rndis per-packet state). To manage this state, we
      currently allocate memory in the transmit path. Eliminate this allocation by
      requesting additional head room in the skb."

  This commit introduced a bug since it did not account for the case if the skb
  was cloned. Fix this bug.

  https://git.kernel.org/cgit/linux/kernel/git/davem/net-
  next.git/commit/?id=b56fc3c536541c8081cd5f1f1d101a16c002a365

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