linux-kernel - Re: [Regression] "iommu/amd: Relax locking in dma_ops path" makes tg3 ethernet transmit queue timeout

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Date:   Fri, 21 Aug 2020 15:43:00 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     iommu@...ts.linux-foundation.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [Regression] "iommu/amd: Relax locking in dma_ops path" makes
 tg3 ethernet transmit queue timeout

Hi Kai,

On Mon, Jun 29, 2020 at 08:33:22PM +0800, Kai-Heng Feng wrote:
> I am still seeing the issue on v5.8-rc3. The issue goes away as soon
> as "iommu=off" is added.

Can you probably help with debugging this issue? I've had no luck so far
getting my hands on a machine with tg3 hardware and an AMD IOMMU.

Regards,

	Joerg