** Changed in: linux (Ubuntu Trusty)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Utopic)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Vivid)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Wily)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Trusty)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Utopic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Vivid)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Wily)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
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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:
In Progress
Status in linux source package in Trusty:
In Progress
Status in linux source package in Utopic:
In Progress
Status in linux source package in Vivid:
In Progress
Status in linux source package in Wily:
In Progress
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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