** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1894896
Title:
[linux-azure][hibernation] Mellanox CX4 NIC's TX/RX packets stop
increasing after hibernation/resume
Status in linux-azure package in Ubuntu:
Invalid
Status in linux-azure source package in Focal:
Fix Committed
Bug description:
[Impact]
Description of problem:
In a VM with CX4 VF NIC on Azure, after hibernation/resume, the TX/RX packet
counters stop increaseing.
This issue doesn't exist in VM with a CX3 VF NIC.
This happens to the latest stable release of the linux-azure
5.4.0-1023.23 kernel and the latest mainline linux kernel.
[Test Case]
How reproducible:
100%
Steps to Reproduce:
1. Start a VM in Azure that supports Accelerated Networking, and enable
hibernation properly (please refer to
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1880032/comments/14
). Please make sure the VF NIC is CX-4 since the issue doesn't happen to CX-3.
2. Do hibernation from serial console
# systemctl hibernate
3. After the VM resumes back, check the MSI interrupt counters in
/proc/interrupts for the CX-4 NIC, and also check “ifconfig” (e.g.
“ifconfig enP2642s2”) for the RX/TX counters. These counters stop
increasing while they should.
[Regression Potential]
The change touches netvsc and has potential to affect any instances
using accelerated networking. However the fix is straightforward and
it's a clean cherry-pick from 5.9.
[Other Info]
BUG FIX:
The fix is in the net.git tree now:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=19162fd4063a3211843b997a454b505edb81d5ce
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