Re: [PATCH mlx5-next v1 2/5] PCI: Add SR-IOV sysfs entry to read number of MSI-X vectors

On Thu, Jan 14, 2021 at 08:40:14AM -0800, Alexander Duyck wrote:

Where I think you and I disagree is that I really think the MSI-X
table size should be fixed at one value for the life of the VF.
Instead of changing the table size it should be the number of vectors
that are functional that should be the limit. Basically there should
be only some that are functional and some that are essentially just
dummy vectors that you can write values into that will never be used.

Ignoring the PCI config space to learn the # of available MSI-X
vectors is big break on the how the device's programming ABI works.

Or stated another way, that isn't compatible with any existing drivers
so it is basically not a useful approach as it can't be deployed.

I don't know why you think that is better.

Jason