linux-kernel - Re: [PATCH v3] ice: Add get/set hw address for VFs using devlink commands

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Date: Tue, 13 Feb 2024 13:50:59 +0100
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Karthik Sundaravel <ksundara@...hat.com>
Cc: jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	pmenzel@...gen.mpg.de, jiri@...nulli.us, rjarry@...hat.com,
	aharivel@...hat.com, vchundur@...hat.com, cfontain@...hat.com,
	jacob.e.keller@...el.com
Subject: Re: [PATCH v3] ice: Add get/set hw address for VFs using devlink
 commands

On Fri, Feb 09, 2024 at 03:39:12PM +0530, Karthik Sundaravel wrote:
> Changing the MAC address of the VFs are not available
> via devlink. Add the function handlers to set and get
> the HW address for the VFs.
> 
> Signed-off-by: Karthik Sundaravel <ksundara@...hat.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_devlink.c | 86 +++++++++++++++++++-
>  1 file changed, 85 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
> index 80dc5445b50d..7ed61b10312c 100644
> --- a/drivers/net/ethernet/intel/ice/ice_devlink.c
> +++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
> @@ -1576,6 +1576,89 @@ void ice_devlink_destroy_pf_port(struct ice_pf *pf)
>  	devlink_port_unregister(&pf->devlink_port);
>  }
>  
> +/**
> + * ice_devlink_port_get_vf_mac_address - .port_fn_hw_addr_get devlink handler
> + * @port: devlink port structure
> + * @hw_addr: MAC address of the port
> + * @hw_addr_len: length of MAC address
> + * @extack: extended netdev ack structure
> + *
> + * Callback for the devlink .port_fn_hw_addr_get operation
> + * Return: zero on success or an error code on failure.
> + */
> +
> +static int ice_devlink_port_get_vf_mac_address(struct devlink_port *port,
> +					       u8 *hw_addr, int *hw_addr_len,
> +					       struct netlink_ext_ack *extack)
> +{
> +	struct devlink_port_attrs *attrs = &port->attrs;
> +	struct devlink_port_pci_vf_attrs *pci_vf;
> +	struct devlink *devlink = port->devlink;
> +	struct ice_pf *pf;
> +	struct ice_vf *vf;
> +	int vf_id;
> +
> +	pf = devlink_priv(devlink);
> +	if (attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_VF) {
> +		pci_vf = &attrs->pci_vf;
> +		vf_id = pci_vf->vf;
> +	} else {
> +		NL_SET_ERR_MSG_MOD(extack, "Unable to get the vf id");
> +		return -EADDRNOTAVAIL;
> +	}
> +	vf = ice_get_vf_by_id(pf, vf_id);
You need to call ice_put_vf(vf); when you finish with vf.

This way to get vf pointer is fine, I wonder if it can be done using
container_of on port variable. Jake, what do you think?
CC: Jacob Keller

> +	if (!vf) {
> +		NL_SET_ERR_MSG_MOD(extack, "Unable to get the vf");
> +		return -EINVAL;
> +	}
> +	ether_addr_copy(hw_addr, vf->dev_lan_addr);
> +	*hw_addr_len = ETH_ALEN;
> +	return 0;
> +}
> +
> +/**
> + * ice_devlink_port_set_vf_mac_address - .port_fn_hw_addr_set devlink handler
> + * @port: devlink port structure
> + * @hw_addr: MAC address of the port
> + * @hw_addr_len: length of MAC address
> + * @extack: extended netdev ack structure
> + *
> + * Callback for the devlink .port_fn_hw_addr_set operation
> + * Return: zero on success or an error code on failure.
> + */
> +static int ice_devlink_port_set_vf_mac_address(struct devlink_port *port,
> +					       const u8 *hw_addr,
> +					       int hw_addr_len,
> +					       struct netlink_ext_ack *extack)
> +{
> +	struct net_device *netdev = port->type_eth.netdev;
Is it PF netdev?

> +	struct devlink_port_attrs *attrs = &port->attrs;
> +	struct devlink_port_pci_vf_attrs *pci_vf;
> +	u8 mac[ETH_ALEN];
> +	int vf_id;
> +
> +	if (attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_VF) {
> +		pci_vf = &attrs->pci_vf;
> +		vf_id = pci_vf->vf;
> +	} else {
> +		NL_SET_ERR_MSG_MOD(extack, "Unable to get the vf id");
> +		return -EADDRNOTAVAIL;
> +	}
> +
> +	if (!netdev) {
> +		NL_SET_ERR_MSG_MOD(extack, "Unable to get the netdev");
> +		return -EADDRNOTAVAIL;
> +	}
> +	ether_addr_copy(mac, hw_addr);
> +
> +	return ice_set_vf_mac(netdev, vf_id, mac);
> +}
> +
> +static const struct devlink_port_ops ice_devlink_vf_port_ops = {
> +	.port_fn_hw_addr_get = ice_devlink_port_get_vf_mac_address,
> +	.port_fn_hw_addr_set = ice_devlink_port_set_vf_mac_address,
> +};
> +
>  /**
>   * ice_devlink_create_vf_port - Create a devlink port for this VF
>   * @vf: the VF to create a port for
> @@ -1611,7 +1694,8 @@ int ice_devlink_create_vf_port(struct ice_vf *vf)
>  	devlink_port_attrs_set(devlink_port, &attrs);
>  	devlink = priv_to_devlink(pf);
>  
> -	err = devlink_port_register(devlink, devlink_port, vsi->idx);
> +	err = devlink_port_register_with_ops(devlink, devlink_port,
> +					     vsi->idx, &ice_devlink_vf_port_ops);
>  	if (err) {
>  		dev_err(dev, "Failed to create devlink port for VF %d, error %d\n",
>  			vf->vf_id, err);
> -- 
> 2.39.3 (Apple Git-145)
>