linux-kernel - Re: [PATCH 1/3] net: mana: Add speed support in mana_get_link

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Message-ID: <b1e513f8-2e0d-4b09-aa10-02b7b593d3c9@linux.dev>
Date: Thu, 17 Apr 2025 15:38:26 +0200
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>, kys@...rosoft.com,
 haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
 andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, longli@...rosoft.com,
 kotaranov@...rosoft.com, horms@...nel.org, kent.overstreet@...ux.dev,
 brett.creeley@....com, schakrabarti@...ux.microsoft.com,
 shradhagupta@...ux.microsoft.com, ssengar@...ux.microsoft.com,
 rosenp@...il.com, paulros@...rosoft.com, linux-hyperv@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-rdma@...r.kernel.org
Subject: Re: [PATCH 1/3] net: mana: Add speed support in
 mana_get_link_ksettings

On 17.04.25 09:57, Erni Sri Satya Vennela wrote:
> Add support for speed in mana ethtool get_link_ksettings
> operation. This feature is not supported by all hardware.
> 
> Signed-off-by: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>
> Reviewed-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>   drivers/net/ethernet/microsoft/mana/mana_en.c | 42 +++++++++++++++++++
>   .../ethernet/microsoft/mana/mana_ethtool.c    |  6 +++
>   include/net/mana/mana.h                       | 17 ++++++++
>   3 files changed, 65 insertions(+)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index 2bac6be8f6a0..ba550fc7ece0 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> @@ -1156,6 +1156,48 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc,
>   	return err;
>   }
>   
> +int mana_query_link_cfg(struct mana_port_context *apc)
> +{
> +	struct net_device *ndev = apc->ndev;
> +	struct mana_query_link_config_resp resp = {};
> +	struct mana_query_link_config_req req = {};
> +	int err;
> +
> +	mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_LINK_CONFIG,
> +			     sizeof(req), sizeof(resp));
> +
> +	req.vport = apc->port_handle;
> +
> +	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
> +				sizeof(resp));
> +
> +	if (err) {
> +		netdev_err(ndev, "Failed to query link config: %d\n", err);
> +		goto out;
> +	}
> +
> +	err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_LINK_CONFIG,
> +				   sizeof(resp));
> +
> +	if (err || resp.hdr.status) {
> +		netdev_err(ndev, "Failed to query link config: %d, 0x%x\n", err,
> +			   resp.hdr.status);
> +		if (!err)
> +			err = -EPROTO;

EPROTO means Protocol error. Thus, ENOTSUPP or EPROTONOSUPPORT is better?

Zhu Yanjun

> +		goto out;
> +	}
> +
> +	if (resp.qos_unconfigured) {
> +		err = -EINVAL;
> +		goto out;
> +	}
> +	apc->speed = resp.link_speed_mbps;
> +	return 0;
> +
> +out:
> +	return err;
> +}
> +