Date: Wed, 31 Jan 2024 17:15:46 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: karthiksundaravel <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, rjarry@...hat.com, aharivel@...hat.com,
 cfontain@...hat.com, vchundur@...hat.com
Subject: Re: [Intel-wired-lan] [PATCH] ice: Add get/set hw address for VF
 representor ports

Dear karthiksundaravel,


Thank you for your patch.


Am 31.01.24 um 09:08 schrieb karthiksundaravel:
> Changing the mac address of the VF representor ports are not

Do you mean “is not possible”?

> available via devlink. Add the function handlers to set and get
> the HW address for the VF representor ports.

How did you test this? It’d be great if you documented it.

> Signed-off-by: karthiksundaravel <ksundara@...hat.com>

Is “karthiksundaravel” the official spelling of your name. If not, you 
can change it with

     git config --global user.name "Your Name"
     git commit -s --amend --author="Your Name <ksundara@...hat.com>"

> ---
>   drivers/net/ethernet/intel/ice/ice_devlink.c | 134 ++++++++++++++++++-
>   1 file changed, 132 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
> index 80dc5445b50d..56d81836c469 100644
> --- a/drivers/net/ethernet/intel/ice/ice_devlink.c
> +++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
> @@ -9,6 +9,8 @@
>   #include "ice_eswitch.h"
>   #include "ice_fw_update.h"
>   #include "ice_dcb_lib.h"
> +#include "ice_fltr.h"
> +#include "ice_tc_lib.h"
>   
>   static int ice_active_port_option = -1;
>   
> @@ -1576,6 +1578,134 @@ 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

Mac/mac is spelled differently. (Also below.)

> + * @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 net_device *netdev = port->type_eth.netdev;
> +
> +	if (!netdev || !netdev->dev_addr)
> +		return -EADDRNOTAVAIL;
> +
> +	ether_addr_copy(hw_addr, netdev->dev_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 devlink *devlink = port->devlink;
> +	struct net_device *netdev = port->type_eth.netdev;
> +	struct ice_pf *pf = devlink_priv(devlink);
> +	struct ice_vsi *vsi = *pf->vsi;
> +	struct ice_hw *hw = &pf->hw;
> +	struct device *dev = ice_pf_to_dev(pf);
> +	u8 old_mac[ETH_ALEN];
> +	u8 flags = 0;
> +	const u8 *mac = hw_addr;
> +	int err;
> +
> +	if (!netdev)
> +		return -EADDRNOTAVAIL;
> +
> +	if (!is_valid_ether_addr(mac))
> +		return -EADDRNOTAVAIL;
> +
> +	if (ether_addr_equal(netdev->dev_addr, mac)) {
> +		dev_dbg(dev, "already using mac %pM\n", mac);
> +		return 0;
> +	}
> +
> +	if (test_bit(ICE_DOWN, pf->state) ||
> +	    ice_is_reset_in_progress(pf->state)) {
> +		dev_err(dev, "can't set mac %pM. device not ready\n", mac);
> +		return -EBUSY;
> +	}
> +
> +	if (ice_chnl_dmac_fltr_cnt(pf)) {
> +		dev_err(dev, "can't set mac %pM. Device has tc-flower filters, delete all of them and try again\n",
> +			mac);
> +		return -EAGAIN;
> +	}
> +
> +	netif_addr_lock_bh(netdev);
> +	ether_addr_copy(old_mac, netdev->dev_addr);
> +	/* change the netdev's MAC address */

The comment seems redundant.

> +	eth_hw_addr_set(netdev, mac);
> +	netif_addr_unlock_bh(netdev);
> +
> +	/* Clean up old MAC filter. Not an error if old filter doesn't exist */
> +	err = ice_fltr_remove_mac(vsi, old_mac, ICE_FWD_TO_VSI);
> +	if (err && err != -ENOENT) {
> +		err = -EADDRNOTAVAIL;
> +		goto err_update_filters;
> +	}
> +
> +	/* Add filter for new MAC. If filter exists, return success */
> +	err = ice_fltr_add_mac(vsi, mac, ICE_FWD_TO_VSI);
> +	if (err == -EEXIST) {
> +		/* Although this MAC filter is already present in hardware it's
> +		 * possible in some cases (e.g. bonding) that dev_addr was
> +		 * modified outside of the driver and needs to be restored back
> +		 * to this value.
> +		 */
> +		dev_dbg(dev, "filter for MAC %pM already exists\n", mac);
> +		return 0;
> +	} else if (err) {
> +		/* error if the new filter addition failed */

The comment seems redundant.

> +		err = -EADDRNOTAVAIL;
> +	}
> +
> +err_update_filters:
> +	if (err) {
> +		dev_err(dev, "can't set MAC %pM. filter update failed\n", mac);
> +		netif_addr_lock_bh(netdev);
> +		eth_hw_addr_set(netdev, old_mac);
> +		netif_addr_unlock_bh(netdev);
> +		return err;
> +	}
> +
> +	dev_dbg(dev, "updated MAC address to %pM\n", netdev->dev_addr);

Should it be level info?

> +
> +	/* write new MAC address to the firmware */
> +	flags = ICE_AQC_MAN_MAC_UPDATE_LAA_WOL;
> +	err = ice_aq_manage_mac_write(hw, mac, flags, NULL);
> +	if (err) {
> +		dev_err(dev, "can't set MAC %pM. write to firmware failed error %d\n",
> +			mac, err);
> +	}
> +	return 0;
> +}
> +
> +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 +1741,8 @@ 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);
> @@ -1620,7 +1751,6 @@ int ice_devlink_create_vf_port(struct ice_vf *vf)
>   
>   	return 0;
>   }
> -

Unrelated whitespace change.

>   /**
>    * ice_devlink_destroy_vf_port - Destroy the devlink_port for this VF
>    * @vf: the VF to cleanup

Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>


Kind regards,

Paul

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