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 <[email protected]>
Reviewed-by: Haiyang Zhang <[email protected]>
Reviewed-by: Shradha Gupta <[email protected]>
Reviewed-by: Saurabh Singh Sengar <[email protected]>
Reviewed-by: Long Li <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: Erni Sri Satya Vennela

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;
 }
 

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;
 

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 */