Public bug reported:

On systems with more than 127 online CPUs, all interrupt vectors on i40e
driver are allocated to tx/rx queues and some features, like Flow
Director SideBand (FD_SB), are kept disabled.

Then, changing some features like TSO/GSO via ethtool will forcibly
enable FD_SB without any vectors available, and this way we get errors.
If we unload the i40e (using "modprobe -r") after these errors, we end
up crashing the system.

There is an upstream patch that address exactly this issue. We want to
request Canonical to merge it on Ubuntu 16.04.1 kernel if possible.

The patch is: a70e407f6d ("i40e: Fix errors resulted while turning off
TSO")
[https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a70e407f6d0b0f63b17d468f78b666d33f264ba1]

Thanks in advance,


Guilherme

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-146656 severity-high 
targetmilestone-inin16041

** Tags added: architecture-ppc64le bugnameltc-146656 severity-high
targetmilestone-inin16041

** Changed in: ubuntu
     Assignee: (unassigned) => Taco Screen team (taco-screen-team)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1626782

Title:
  i40e/setting some ethtool features and remove module right after
  (modprobe -r) lead to crash in systems with more than 127 CPUs

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