Public bug reported:
[Impact]
Using an Intel i40e network device, under heavy traffic load with
TSO enabled, the device will spontaneously reset itself and issue errors
similar to the following:
Jun 14 14:09:51 hostname kernel: [4253913.851053] i40e 0000:05:00.1: TX driver
issue detected, PF reset issued
Jun 14 14:09:53 hostname kernel: [4253915.476283] i40e 0000:05:00.1: TX driver
issue detected, PF reset issued
Jun 14 14:09:54 hostname kernel: [4253917.411264] i40e 0000:05:00.1: TX driver
issue detected, PF reset issued
This causes a full reset of the PF, which causes an interruption
in traffic flow.
This was partially fixed by Xenial commit
12f8cc59d5886b86372f45290166deca57a60d7a, however there is one
additional upstream commit required to fully fix the issue:
commit 841493a3f64395b60554afbcaa17f4350f90e764
Author: Alexander Duyck <alexander.h.du...@intel.com>
Date: Tue Sep 6 18:05:04 2016 -0700
i40e: Limit TX descriptor count in cases where frag size is greater
than 16K
This fix was never backported into the Xenial 4.4 kernel series, but is
already present in the Xenial HWE (and Zesty) 4.10 kernel.
[Testcase]
In this case, the issue occurs at a customer site using i40e based
Intel network cards with SR-IOV enabled. Under heavy load, the card will
reset itself as described.
[Regression Potential]
As with any change to a network card driver, this may cause regressions
with network I/O through i40e card(s). However, this specific change
only increases the likelyhood that any specific large TSO tx will need
to be linearized, which will avoid the PF reset. Linearizing a TSO tx
that did not need to be linearized will not cause any failures, it may
only decrease performance slightly. However this patch should only
cause linearization when required to avoid the MDD detection and PF
reset.
[Other Info]
The previous bug for this issue is bug 1700834.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/1713553
Title:
Intel i40e PF reset due to incorrect MDD detection
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