linux-kernel - RE: [EXTERNAL] [PATCH net-next v3 3/4] net: mana: Add speed support in mana_get_link

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Message-ID:
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Date: Tue, 17 Jun 2025 15:54:47 +0000
From: Long Li <longli@...rosoft.com>
To: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>, KY Srinivasan
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	Konstantin Taranov <kotaranov@...rosoft.com>, "horms@...nel.org"
	<horms@...nel.org>, Shiraz Saleem <shirazsaleem@...rosoft.com>,
	"leon@...nel.org" <leon@...nel.org>, "shradhagupta@...ux.microsoft.com"
	<shradhagupta@...ux.microsoft.com>, "schakrabarti@...ux.microsoft.com"
	<schakrabarti@...ux.microsoft.com>, "gerhard@...leder-embedded.com"
	<gerhard@...leder-embedded.com>, "rosenp@...il.com" <rosenp@...il.com>,
	"sdf@...ichev.me" <sdf@...ichev.me>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>
Subject: RE: [EXTERNAL] [PATCH net-next v3 3/4] net: mana: Add speed support
 in mana_get_link_ksettings

> Subject: [PATCH net-next v3 3/4] net: mana: Add speed support in
> mana_get_link_ksettings
> 
> Allow mana ethtool get_link_ksettings operation to report the maximum speed
> supported by the SKU in mbps.
> 
> The driver retrieves this information by issuing a HWC command to the hardware
> via mana_query_link_cfg(), which retrieves the SKU's maximum supported speed.
> 
> These APIs when invoked on hardware that are older/do not support these APIs,
> the speed would be reported as UNKNOWN.
> 
> Before:
> $ethtool enP30832s1
> > Settings for enP30832s1:
>         Supported ports: [  ]
>         Supported link modes:   Not reported
>         Supported pause frame use: No
>         Supports auto-negotiation: No
>         Supported FEC modes: Not reported
>         Advertised link modes:  Not reported
>         Advertised pause frame use: No
>         Advertised auto-negotiation: No
>         Advertised FEC modes: Not reported
>         Speed: Unknown!
>         Duplex: Full
>         Auto-negotiation: off
>         Port: Other
>         PHYAD: 0
>         Transceiver: internal
>         Link detected: yes
> 
> After:
> $ethtool enP30832s1
> > Settings for enP30832s1:
>         Supported ports: [  ]
>         Supported link modes:   Not reported
>         Supported pause frame use: No
>         Supports auto-negotiation: No
>         Supported FEC modes: Not reported
>         Advertised link modes:  Not reported
>         Advertised pause frame use: No
>         Advertised auto-negotiation: No
>         Advertised FEC modes: Not reported
>         Speed: 16000Mb/s
>         Duplex: Full
>         Auto-negotiation: off
>         Port: Other
>         PHYAD: 0
>         Transceiver: internal
>         Link detected: yes
> 
> Signed-off-by: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Reviewed-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> Reviewed-by: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>

Reviewed-by: Long Li <longli@...rosoft.com>

> ---
> Changes in v3:
> * Rebase to latest net-next branch.
> Changes in v2:
> * No change.
> ---
>  drivers/net/ethernet/microsoft/mana/mana_en.c      | 1 +
>  drivers/net/ethernet/microsoft/mana/mana_ethtool.c | 6 ++++++
>  include/net/mana/mana.h                            | 2 ++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c
> b/drivers/net/ethernet/microsoft/mana/mana_en.c
> index 547dff450b6d..d7079e05dfb8 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_en.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
> @@ -1272,6 +1272,7 @@ int mana_query_link_cfg(struct mana_port_context
> *apc)
>  		return err;
>  	}
>  	apc->speed = resp.link_speed_mbps;
> +	apc->max_speed = resp.qos_speed_mbps;
>  	return 0;
>  }
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> index 4fb3a04994a2..a1afa75a9463 100644
> --- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> +++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> @@ -495,6 +495,12 @@ static int mana_set_ringparam(struct net_device *ndev,
> static int mana_get_link_ksettings(struct net_device *ndev,
>  				   struct ethtool_link_ksettings *cmd)  {
> +	struct mana_port_context *apc = netdev_priv(ndev);
> +	int err;
> +
> +	err = mana_query_link_cfg(apc);
> +	cmd->base.speed = (err) ? SPEED_UNKNOWN : apc->max_speed;
> +
>  	cmd->base.duplex = DUPLEX_FULL;
>  	cmd->base.port = PORT_OTHER;
> 
> diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h index
> 038b18340e51..e1030a7d2daa 100644
> --- a/include/net/mana/mana.h
> +++ b/include/net/mana/mana.h
> @@ -533,6 +533,8 @@ struct mana_port_context {
>  	u16 port_idx;
>  	/* Currently configured speed (mbps) */
>  	u32 speed;
> +	/* Maximum speed supported by the SKU (mbps) */
> +	u32 max_speed;
> 
>  	bool port_is_up;
>  	bool port_st_save; /* Saved port state */
> --
> 2.34.1