Public bug reported:
[Impact]
Microsoft has requested us to backport the following bugfix:
32316f676b4e ("net: mana: Fix RX buf alloc_size alignment and atomic op panic")
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=32316f676b4e
[Fix]
Clean-cherry pick to the trees (oracular/noble/jammy) containing the following
break commit:
80f6215b450e ("net: mana: Add support for jumbo frame")
[Test plan]
Compile and boot tested.
[Where problems could occur]
This is a minor adjustment to the allocated size for MANA RX buffers,
fixing the alignment of the resulting SKB in order to improve
performance and avoid alignment faults during atomic operations on
ARM64. As such, the regression risk seems to be low (especially
considering the allocated size for the buffer will end up being bigger,
not smaller), but any issues here would impact the reception of network
packets in MANA.
[Other info]
SF #00394982
** Affects: linux-azure (Ubuntu)
Importance: High
Assignee: Vinicius Peixoto (vpeixoto)
Status: New
** Affects: linux-azure (Ubuntu Jammy)
Importance: High
Assignee: Vinicius Peixoto (vpeixoto)
Status: New
** Affects: linux-azure (Ubuntu Noble)
Importance: High
Assignee: Vinicius Peixoto (vpeixoto)
Status: New
** Affects: linux-azure (Ubuntu Oracular)
Importance: High
Assignee: Vinicius Peixoto (vpeixoto)
Status: New
** Changed in: linux-azure (Ubuntu)
Assignee: (unassigned) => Vinicius Peixoto (vpeixoto)
** Changed in: linux-azure (Ubuntu)
Importance: Undecided => High
** Also affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Oracular)
Importance: High
Assignee: Vinicius Peixoto (vpeixoto)
Status: New
** Also affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu Jammy)
Importance: Undecided => High
** Changed in: linux-azure (Ubuntu Noble)
Importance: Undecided => High
** Changed in: linux-azure (Ubuntu Jammy)
Assignee: (unassigned) => Vinicius Peixoto (vpeixoto)
** Changed in: linux-azure (Ubuntu Noble)
Assignee: (unassigned) => Vinicius Peixoto (vpeixoto)
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https://bugs.launchpad.net/bugs/2079854
Title:
net: mana: Fix RX buf alloc_size alignment and atomic op panic
Status in linux-azure package in Ubuntu:
New
Status in linux-azure source package in Jammy:
New
Status in linux-azure source package in Noble:
New
Status in linux-azure source package in Oracular:
New
Bug description:
[Impact]
Microsoft has requested us to backport the following bugfix:
32316f676b4e ("net: mana: Fix RX buf alloc_size alignment and atomic op
panic")
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=32316f676b4e
[Fix]
Clean-cherry pick to the trees (oracular/noble/jammy) containing the
following break commit:
80f6215b450e ("net: mana: Add support for jumbo frame")
[Test plan]
Compile and boot tested.
[Where problems could occur]
This is a minor adjustment to the allocated size for MANA RX buffers,
fixing the alignment of the resulting SKB in order to improve
performance and avoid alignment faults during atomic operations on
ARM64. As such, the regression risk seems to be low (especially
considering the allocated size for the buffer will end up being
bigger, not smaller), but any issues here would impact the reception
of network packets in MANA.
[Other info]
SF #00394982
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2079854/+subscriptions
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