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Fix ixl SR-IOV.

Authored by on Jun 29 2022, 4:01 AM.


Group Reviewers
Intel Networking
Restricted Owners Package(Owns No Changed Paths)
rGe706512a2b64: ixl(4): Fix SR-IOV panics

The hw and ifp of a vsi will be NULL if such ixl_vsi is allocated
for a VF. When ixl_reconfigure_filters called, it is trying to
access vsi->ifp and hw->mac.addr and therefore is casuing panic.

This commit add checks to determine if vsi is a VF by checking
if vsi->hw is NULL, before adding IXL_VLAN_ANY filter (which
is already in a VF vsi's filter list) and VLAN filters.

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I think the SR-IOV flows need revisiting (why doesn't the vsi have a valid hw pointer?), but if your fix works, I think we should include it for now to prevent panics.

This revision is now accepted and ready to land.Jun 30 2022, 9:13 PM added inline comments.

The part about a filter list does not seem correct to me. ixl_init_filters exits early in case of VF VSI. I think it is added later with a virtchnl message. Although as Eric said SR-IOV support needs more attention so getting rid of this panic is a good way to start. Thanks!

@erj Thank you so much for reviewing. Do you mind to commit this as well? Thank you so much.


This is very interesting, as when I was tracking done the panic, the vsi->ftl contains exactly 1 filter of IXL_VLAN_ANY, and that lead me to think it was intended.

I'm back from vacation; I'll commit it tomorrow if there isn't anything else.

This revision was automatically updated to reflect the committed changes.
Owners added a reviewer: Restricted Owners Package.Jul 13 2022, 1:26 AM