linux-kernel - Re: [PATCH net 1/1] net: stmmac: disable Split Header (SPH) for Intel platforms

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Message-ID: <8735i0ndy7.fsf@kurt>
Date:   Tue, 26 Apr 2022 15:58:56 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Tan Tee Min <tee.min.tan@...ux.intel.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Wong Vee Khee <vee.khee.wong@...ux.intel.com>,
        Tan Tee Min <tee.min.tan@...ux.intel.com>,
        Ling Pei Lee <pei.lee.ling@...el.com>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Voon Wei Feng <weifeng.voon@...el.com>,
        Song Yoong Siang <yoong.siang.song@...el.com>,
        Ong@...r.kernel.org, Boon Leong <boon.leong.ong@...el.com>,
        Tan Tee Min <tee.min.tan@...el.com>
Subject: Re: [PATCH net 1/1] net: stmmac: disable Split Header (SPH) for
 Intel platforms

Hi,

On Tue Apr 26 2022, Tan Tee Min wrote:
> Based on DesignWare Ethernet QoS datasheet, we are seeing the limitation
> of Split Header (SPH) feature is not supported for Ipv4 fragmented packet.
> This SPH limitation will cause ping failure when the packets size exceed
> the MTU size. For example, the issue happens once the basic ping packet
> size is larger than the configured MTU size and the data is lost inside
> the fragmented packet, replaced by zeros/corrupted values, and leads to
> ping fail.
>
> So, disable the Split Header for Intel platforms.

Does this issue only apply on Intel platforms?

Thanks,
Kurt

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