Date: Thu, 1 Feb 2024 09:00:14 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Jiri Pirko <jiri@...nulli.us>
Cc: ksundara@...hat.com, 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 Jiri,


Am 01.02.24 um 08:40 schrieb Jiri Pirko:
> Wed, Jan 31, 2024 at 05:15:46PM CET, pmenzel@...gen.mpg.de wrote:

[…]

>> 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>
> 
> 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.

Sorry about that. I will keep this in mind.

> 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?

Yes, I missed it. (I disabled threading in Mozilla Thunderbird. I am 
going to change that again. Sorry about that.)


Kind regards,

Paul

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