Subject: Re: [Intel-wired-lan] [PATCH] ice: Add get/set hw address for VF representor ports

From: Jiri Pirko <[email-masked]>
Date: Thu, 1 Feb 2024 08:40:24 +0100

Wed, Jan 31, 2024 at 05:15:46PM CET, [email-masked] wrote:
>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 <[email-masked]>
>
>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 <[email-masked]>"
>
>> ---
>>   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 <[email-masked]>

Paul. It looks a bit weird you put in multiple comments that require
changes and then the Reviewed-by tag. Usually, you put the tag only if
you are 100% happy with the patch as it is.

It is also weird you put in a tag in this case when the patch
is completely wrong, as I pointed out in my first reply. Did you miss
it?

>Kind regards,
>Paul