netdev - Re: [PATCH net-next] selftests: devmem: configure HDS threshold

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Message-ID: <aGKouujd9Y18lmQw@mini-arch>
Date: Mon, 30 Jun 2025 08:09:46 -0700
From: Stanislav Fomichev <stfomichev@...il.com>
To: Taehee Yoo <ap420073@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
	edumazet@...gle.com, andrew+netdev@...n.ch, shuah@...nel.org,
	almasrymina@...gle.com, sdf@...ichev.me, jdamato@...tly.com,
	netdev@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next] selftests: devmem: configure HDS threshold

On 06/30, Taehee Yoo wrote:
> The devmem TCP requires the hds-thresh value to be 0, but it doesn't
> change it automatically.
> Therefore, configure_hds_thresh() is added to handle this.
> 
> The run_devmem_tests() now tests hds_thresh, but it skips test if the
> hds_thresh_max value is 0.
> 
> Signed-off-by: Taehee Yoo <ap420073@...il.com>
> ---
>  .../selftests/drivers/net/hw/ncdevmem.c       | 86 +++++++++++++++++++
>  1 file changed, 86 insertions(+)
> 
> diff --git a/tools/testing/selftests/drivers/net/hw/ncdevmem.c b/tools/testing/selftests/drivers/net/hw/ncdevmem.c
> index cc9b40d9c5d5..d78b5e5697d7 100644
> --- a/tools/testing/selftests/drivers/net/hw/ncdevmem.c
> +++ b/tools/testing/selftests/drivers/net/hw/ncdevmem.c
> @@ -349,6 +349,72 @@ static int configure_headersplit(bool on)
>  	return ret;
>  }
>  
> +static int configure_hds_thresh(int len)
> +{
> +	struct ethtool_rings_get_req *get_req;
> +	struct ethtool_rings_get_rsp *get_rsp;
> +	struct ethtool_rings_set_req *req;
> +	struct ynl_error yerr;
> +	struct ynl_sock *ys;
> +	int ret;
> +
> +	ys = ynl_sock_create(&ynl_ethtool_family, &yerr);
> +	if (!ys) {
> +		fprintf(stderr, "YNL: %s\n", yerr.msg);
> +		return -1;
> +	}
> +
> +	req = ethtool_rings_set_req_alloc();
> +	ethtool_rings_set_req_set_header_dev_index(req, ifindex);

[..]

> +	ethtool_rings_set_req_set_hds_thresh(req, len);

Any reason not to add this to the existing configure_headersplit? Is it
only for tests?