netdev - Re: [RFC] net: dsa: qca8k: CPU port broken with commit 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in genphy_read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ace6a92f-dc2e-4feb-eb0d-a79d5906b07b@gmail.com>
Date:   Tue, 26 Feb 2019 08:33:16 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Michal Vokáč <michal.vokac@...ft.com>,
        Andrew Lunn <andrew@...n.ch>, Vinod Koul <vkoul@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: Re: [RFC] net: dsa: qca8k: CPU port broken with commit 5502b218e001
 ("net: phy: use phy_resolve_aneg_linkmode in genphy_read_status")

On 20.02.2019 16:02, Michal Vokáč wrote:
> Hi,
> 
> Another issue in a row with networking on imx6dl-yapp4 platform [1]
> that uses QCA8334 Ethernet switch.
> 
> Very recently, with Vinod and Andrew, we solved an issue with
> RGMII_ID mode by patch[2][3]. I tested those with next-20190215
> and it worked just fine.
> 
> The patch[2] was merged into next-20190220 so I tested the latest version.
> Now the cpu port does not work again. I tracked it down to this commit
> 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in
> genphy_read_status") [4]
> 
> If I revert the offending commit, cpu port works fine. I suspect the
> problem is on the qca8k driver side but I am not really sure.
> AFAICT autonegotiation is not available on the QCA833x cpu port (MAC0).
> 
> Any ideas what may be the root cause of the problem?
> 
Hi Michal,

I faced the same issue on a system with  Marvell switch.
Should be fixed with 0f3b1cf23f0e ("net: phy: fix reading fixed phy status").
This patch is in net-next currently and should show up in linux-next today.

> Thank you,
> Michal
> 
Heiner

> [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=87489ec3a77f3e01bcf0d46e353ae7112ec8c4f0
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a968b5e9d5879f9535d6099505f9e14abcafb623
> [3] https://lore.kernel.org/patchwork/patch/1043817/
> [4] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=5502b218e001
>