linux-kernel - Re: [PATCH v3 0/2] TSO bug fixes

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Message-Id: <20200205.144940.712557491994145617.davem@davemloft.net>
Date:   Wed, 05 Feb 2020 14:49:40 +0100 (CET)
From:   David Miller <davem@...emloft.net>
To:     harini.katakam@...inx.com
Cc:     nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, michal.simek@...inx.com,
        harinikatakamlinux@...il.com
Subject: Re: [PATCH v3 0/2] TSO bug fixes

From: Harini Katakam <harini.katakam@...inx.com>
Date: Wed,  5 Feb 2020 18:08:10 +0530

> An IP errata was recently discovered when testing TSO enabled versions
> with perf test tools where a false amba error is reported by the IP.
> Some ways to reproduce would be to use iperf or applications with payload
> descriptor sizes very close to 16K. Once the error is observed TXERR (or
> bit 6 of ISR) will be constantly triggered leading to a series of tx path
> error handling and clean up. Workaround the same by limiting this size to
> 0x3FC0 as recommended by Cadence. There was no performance impact on 1G
> system that I tested with.
> 
> Note on patch 1: The alignment code may be unused but leaving it there
> in case anyone is using UFO.
> 
> Added Fixes tag to patch 1.

Series applied and queued up for -stable, thank you.