[LU-17325] o2iblnd: graceful handling of CM_EVENT_UNREACHABLE on established connection

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Labels: RoCE o2iblnd
• Severity: 3
• Assignee: Serguei Smirnov
• Reporter: Serguei Smirnov

Description

There were examples in the field with RoCE setups which demonstrate that CM_EVENT_UNREACHABLE may be received when connection is already in ESTABLISHED state.

This causes the assertion in kiblnd_cm_callback() to fail:

 ASSERTION( conn->ibc_state != 3 && conn->ibc_state != 0 ) failed:

It is proposed to handle this in a more gracious manner:  report the event as unexpected and allow the flow to continue. If there are indeed issues on the connection, it is expected to report transaction errors and get cleaned up without crashing the whole system.

Issue Links

• is related to: LU-18260 o2iblnd: graceful handling of unexpected RDMA_CM_EVENT_REJECTED

Comments

[Gerrit Updater]

"Etienne AUJAMES <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/56520
Subject: LU-17325 o2iblnd: CM_EVENT_UNREACHABLE on established conn
Project: fs/lustre-release
Branch: b2_15
Current Patch Set: 1
Commit: 2662418d67bf70025c55898e2bde2cb5fc2a3559

[Peter Jones]

Landed for 2.16

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/c/fs/lustre-release/+/53298/
Subject: LU-17325 o2iblnd: CM_EVENT_UNREACHABLE on established conn
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: f7051f0092b19416ed86d7f4bbfe1cba7bb74c02

[Gerrit Updater]

"Serguei Smirnov <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/53298
Subject: LU-17325 o2iblnd: CM_EVENT_UNREACHABLE on established conn
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: cbde71bf893dba0de752a190c3b16d653ef75085