** Changed in: linux-lts-utopic (Ubuntu Precise)
Status: In Progress => Invalid
** Changed in: linux-lts-utopic (Ubuntu Precise)
Assignee: Tim Gardner (timg-tpi) => (unassigned)
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https://bugs.launchpad.net/bugs/1494431
Title:
[Hyper-V] netvsc support to set MTU reservation from guest
Status in linux package in Ubuntu:
Fix Released
Status in linux-lts-trusty package in Ubuntu:
Won't Fix
Status in linux-lts-utopic package in Ubuntu:
Fix Released
Status in linux source package in Precise:
Invalid
Status in linux-lts-trusty source package in Precise:
Won't Fix
Status in linux-lts-utopic source package in Precise:
Invalid
Status in linux source package in Trusty:
Won't Fix
Status in linux source package in Vivid:
Fix Released
Status in linux source package in Wily:
Fix Released
Bug description:
Please incorporate the following upstream commits (and necessary pre-
requisites )to the 4.2 kernel into 15.10, 15.04, 14.04 (including
HWE), and 12.04 (including HWE). Network throughput is improved with
proper setting of MTU in virtualized environments.
hv_netvsc: Add support to set MTU reservation from guest side
When packet encapsulation is in use, the MTU needs to be reduced for
headroom reservation.
The existing code takes the updated MTU value only from the host side.
But vSwitch extensions, such as Open vSwitch, require the flexibility
to change the MTU to different values from within a guest during the
lifecycle of a vNIC, when the encapsulation protocol is changed. The
patch supports this kind of MTU changes.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f9cbce34c34bcc05ea0dd78c8999bfe88b5b6b86
hv_netvsc: Add close of RNDIS filter into change mtu call
The current change mtu call only stops tx before removing RNDIS filter.
In case ringbufer is not empty, the rndis_filter_device_remove() may
hang on removing the buffers.
This patch adds close of RNDIS filter before removing it, also a
gradual waiting loop until the ring is empty. The change_mtu hang
issue under heavy traffic is solved by this patch.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2de8530ba0c71a2fba02590681af0f3a2a187a9b
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