Issue found in Armada 370: "No buffer space available" error during continuous ping

[Maggie Mae Roxas]

Hi Thomas,
Good day.

As much as we'd like to switch to the latest v3.14.x, we need to stay
at kernel v3.13.9 as that is a hard requirement of our customer (I
think it's because it's the base platform for Ubuntu 14.04 FS which
we'll use).

So I applied your patch in our v3.13.9 as suggested:
http://kernel.opensuse.org/cgit/kernel/patch/?id=cd71e246c16b30e3f396a85943d5f596202737ba

Unfortunately, issue still exists after we applied it.

> Basically, between 3.13.5 and 3.13.9, I introduced two patches to the
network driver:

Given this, we tried to replace mvneta.c of our v3.13.9 and replace it
with v3.13.5's mvneta.c.
Issue does not exist when we did that - but of course, we surely will
miss something, so we wanted to confirm this further with you.
It seems like applying cd71e246c16b30e3f396a85943d5f596202737ba in
v3.13.9 is not sufficient enough..?
Possibly there are v3.13.5 and v3.13.9 diff (see attached) needed
apart from just cd71e246c16b30e3f396a85943d5f596202737ba?

> Thanks again for your report!
No problem. We're also thankful for your support!

Regards,
Maggie Roxas

On Tue, Jul 8, 2014 at 1:21 AM, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> Dear Maggie Mae Roxas,
>
> On Mon, 7 Jul 2014 19:27:22 -0700, Maggie Mae Roxas wrote:
>> Sorry, correcting typo:
>>
>> - 3.13.9 (issue exists)
>> - 3.10.24 (issue does NOT exist)
>> - 3.13.5 (issue does NOT exist)
>
> Ok, thanks again for the report. Unfortunately, you're hitting a known
> problem that was fixed, but after the 3.13-stable cycle was closed.
> Basically, between 3.13.5 and 3.13.9, I introduced two patches to the
> network driver:
>
> $ git slog --author=free-electrons v3.13.5..v3.13.9
> 396b229b683fdc08d8705883860ec5a1b810546a net: mvneta: fix usage as a module on RGMII configurations
> ea64e1f33d9d627da5d38da035e5d7443276e84e net: mvneta: rename MVNETA_GMAC2_PSC_ENABLE to MVNETA_GMAC2_PCS_ENABLE
>
> To fix the usage of mvneta on RGMII configurations. However, by doing
> so, I broke SGMII configurations. So, I sent a patch to revert "net:
> mvneta: fix usage as a module on RGMII configurations", which was
> accepted. But in the mean time, the 3.13-stable cycle was closed, so
> this revert was never merged in the 3.13.x series.
>
> If you want to stay on 3.13.x, you should therefore apply:
>
> cd71e246c16b30e3f396a85943d5f596202737ba Revert "net: mvneta: fix usage as a module on RGMII configurations"
>
> This commit is from the 3.14-stable branch, in Linus master branch,
> it's:
>
> cc6ca3023f2c2bbcd062e9d4cf6afc2ba2821ada Revert "net: mvneta: fix usage as a module on RGMII configurations"
>
> Some other commits, merged after that, fix the usage of mvneta as a
> module on both RGMII and SGMII configurations.
>
> Any reason you're still using 3.13.x ? You should really consider
> switching at least to v3.14.x, which is a long-term version, and
> therefore still maintained. If you use v3.14.x, all of your bug reports
> that end up in patches, will ultimately be fixed in v3.14.x.
>
> Thanks again for your report!
>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
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