On Fri, May 31, 2024 at 12:44 PM Luca Vizzarro <Luca.Vizzarro@arm.com>
wrote:

>
> In my testing of Jeremy's patches which depend on this one ("Add second
> scatter test case"), I've discovered that the Intel E810-C NIC I am
> using to test does not automatically show "RX scattered packets: on".
> But I've noticed it does if the MTU is set to something big like 9000.
>
> I've tested a change of this by adding:
>
>            self.set_port_mtu(0, 9000)
> > +        rxq_info = self.send_command(command)
>            self.set_port_mtu(1, 9000)
>
> And it seems to work alright. I've also tested this specific change with
> Mellanox NICs and it didn't seem to affect them at all. No errors or
> problems and they still showed "RX scattered packets: off" as expected.
>
> The `set_port_mtu` method comes from Jeremy's patch...
>
>
>
Hi Jeremy,

Sounds like Luca's way ahead of me here, but I wanted to note that I did
run from the capabilities patch + Jeremy's new Scatter patch, across these
NICs:

Mellanox CX5
Broadcom 57414 25G
Broadcom P2100G
Intel XL710 40G

And in call cases scatter_mbuf_2048 skips,
and scatter_mbuf_2048_with_offload runs.

The 2nd case passed in all cases, excluding the XL710 where it errors with
"Test pmd failed to set fwd mode to mac." I can double check that to ensure
there was no setup error on my part, but I think the more interesting part
is the skip on the non-offload testcase, as I recall Jeremy saying that the
XL710 was expected to natively support scatter and run the first testcase.

I can do a rerun, adding in the MTU modifier, and see if the same
adjustment happens as with the E810 as Luca describes.