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From:   Kurt Kanzenbach <kurt@linutronix.de>
To:     Tan Tee Min <tee.min.tan@linux.intel.com>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>,
        Xiaoliang Yang <xiaoliang.yang_1@nxp.com>,
        Wong Vee Khee <vee.khee.wong@linux.intel.com>,
        Tan Tee Min <tee.min.tan@linux.intel.com>,
        Ling Pei Lee <pei.lee.ling@intel.com>,
        Bhupesh Sharma <bhupesh.sharma@linaro.org>
Cc:     netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org, Voon Wei Feng <weifeng.voon@intel.com>,
        Song Yoong Siang <yoong.siang.song@intel.com>,
        Ong@vger.kernel.org, Boon Leong <boon.leong.ong@intel.com>,
        Tan Tee Min <tee.min.tan@intel.com>
Subject: Re: [PATCH net 1/1] net: stmmac: disable Split Header (SPH) for
 Intel platforms
In-Reply-To: <20220426074531.4115683-1-tee.min.tan@linux.intel.com>
References: <20220426074531.4115683-1-tee.min.tan@linux.intel.com>
Date:   Tue, 26 Apr 2022 15:58:56 +0200
Message-ID: <8735i0ndy7.fsf@kurt>
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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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