** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1989990
Title:
[SRU] Ubuntu 22.04 - NVMe TCP - Host fails to reconnect to target
after link down/link up sequence
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
In Progress
Bug description:
[Impact]
Ubuntu 22.04 host fails to reconnect successfully to the NVMe TCP target
after link down event if the number of queues have changed post link down.
[Fix]
Following upstream patch set helps address the issue.
1.
nvmet: Expose max queues to configfs
https://git.infradead.org/nvme.git/commit/2c4282742d049e2a5ab874e2b359a2421b9377c2
2.
nvme-tcp: Handle number of queue changes
https://git.infradead.org/nvme.git/commit/516204e486a19d03962c2757ef49782e6c1cacf4
3.
nvme-rdma: Handle number of queue changes
https://git.infradead.org/nvme.git/commit/e800278c1dc97518eab1970f8f58a5aad52b0f86
The patch in Point 2 above helps address the failure to reconnect in
NVMe TCP scenario.
Also, following patch addresses error code parsing issue in the
reconnect sequence.
nvme-fabrics: parse nvme connect Linux error codes
https://git.infradead.org/nvme.git/commit/ec9e96b5230148294c7abcaf3a4c592d3720b62d
[Test Plan]
1. Boot into Ubuntu 22.04 kernel without fix.
2. Establish connection to NVMe TCP target.
3. Toggle NIC link and bring link up after 10 seconds. When the NIC
link is down, on the target increase the number of queues assigned to
the controller.
4. Observe that connection to target is lost and after link comes up,
controller from host tries to re-establish connection.
5. With patch, reconnection succeeds with higher number of queues
[Where problems could occur]
Regression risk is low to medium.
[Other Info]
Test Kernel Source
https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/jammy/+ref/lp_1989990_nvme_tcp
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