netdev - RE: [PATCH linux-next 1/3] selftests: net: udpgso_bench

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Date:   Mon, 17 Apr 2023 11:16:02 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Yang Yang <yang.yang29@....com.cn>, davem@...emloft.net,
        edumazet@...gle.com, willemdebruijn.kernel@...il.com
Cc:     yang.yang29@....com.cn, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com, shuah@...nel.org,
        zhang.yunkai@....com.cn, xu.xin16@....com.cn,
        Xuexin Jiang <jiang.xuexin@....com.cn>
Subject: RE: [PATCH linux-next 1/3] selftests: net: udpgso_bench_rx: Fix
 verifty exceptions

Yang Yang wrote:
> From: Zhang Yunkai (CGEL ZTE) <zhang.yunkai@....com.cn>
> 
> The verification function of this test case is likely to encounter the
> following error, which may confuse users.
> 
> Executing the following command fails:
> bash# udpgso_bench_tx -l 4 -4 -D "$DST"
> bash# udpgso_bench_tx -l 4 -4 -D "$DST" -S 0
> bash# udpgso_bench_rx -4 -G -S 1472 -v

Why are you running two senders concurrently? The test is not intended
to handle that case.

> udpgso_bench_rx: data[1472]: len 2944, a(97) != q(113)
> 
> This is because the sending buffers are not aligned by 26 bytes, and the
> GRO is not merged sequentially, and the receiver does not judge this
> situation. We do the validation after the data is split at the receiving
> end, just as the application actually uses this feature.
> 
> Signed-off-by: Zhang Yunkai (CGEL ZTE) <zhang.yunkai@....com.cn>
> Reviewed-by: xu xin (CGEL ZTE) <xu.xin16@....com.cn>
> Reviewed-by: Yang Yang (CGEL ZTE) <yang.yang29@....com.cn>
> Cc: Xuexin Jiang (CGEL ZTE) <jiang.xuexin@....com.cn>