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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Wily)
   Importance: High
       Status: Triaged

** Also affects: linux (Ubuntu Utopic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

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

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

** Changed in: linux (Ubuntu Utopic)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => High

** Tags added: trusty utopic wily

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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:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged
Status in linux source package in Vivid:
  Triaged
Status in linux source package in Wily:
  Triaged

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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