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Date: Thu, 8 Feb 2024 12:26:51 +0100
From: Jiri Pirko <jiri@resnulli.us>
To: Karthik Sundaravel <ksundara@redhat.com>
Cc: jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com,
	davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
	pabeni@redhat.com, intel-wired-lan@lists.osuosl.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	pmenzel@molgen.mpg.de, michal.swiatkowski@linux.intel.com,
	rjarry@redhat.com, aharivel@redhat.com, vchundur@redhat.com,
	cfontain@redhat.com
Subject: Re: [PATCH v2] ice: Add get/set hw address for VFs using devlink
 commands
Message-ID: <ZcS6e1Z4w76Z2F_K@nanopsycho>
References: <20240208082455.66726-1-ksundara@redhat.com>
 <20240208082455.66726-2-ksundara@redhat.com>
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In-Reply-To: <20240208082455.66726-2-ksundara@redhat.com>

Thu, Feb 08, 2024 at 09:24:55AM CET, ksundara@redhat.com wrote:
>Changing the MAC address of the VF ports are not available
>via devlink. Add the function handlers to set and get
>the HW address for the VF ports.

"VFs". Avoid the word "port" here, as it may falsely indicate you are
talking about the eswitch representor port.


>
>Signed-off-by: Karthik Sundaravel <ksundara@redhat.com>
>---
> drivers/net/ethernet/intel/ice/ice_devlink.c | 89 +++++++++++++++++++-
> 1 file changed, 88 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..8455fa94a687 100644
>--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
>+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
>@@ -1576,6 +1576,92 @@ 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 *devlink = port->devlink;
>+	struct ice_pf *pf = devlink_priv(devlink);
>+	struct device *dev = ice_pf_to_dev(pf);
>+	struct devlink_port_attrs *attrs = &port->attrs;
>+	struct devlink_port_pci_vf_attrs *pci_vf;
>+	int vf_id;
>+	struct ice_vf *vf;

Reverse xmas tree:
https://www.kernel.org/doc/html/v6.7/process/maintainer-netdev.html#tl-dr


>+
>+	if (attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_VF) {
>+		pci_vf = &attrs->pci_vf;
>+		vf_id = pci_vf->vf;
>+	} else {
>+		dev_err(dev, "Unable to get the vf id for PF %d\n", pf->hw.pf_id);

Fill the extack message instead.


>+		return -EADDRNOTAVAIL;
>+	}
>+	vf = ice_get_vf_by_id(pf, vf_id);
>+	if (!vf) {
>+		dev_err(dev, "Unable to get the vf for PF %d\n", pf->hw.pf_id);

Fill the extack message instead.


>+		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 devlink *devlink = port->devlink;
>+	struct ice_pf *pf = devlink_priv(devlink);
>+	struct device *dev = ice_pf_to_dev(pf);
>+	struct net_device *netdev = port->type_eth.netdev;
>+	struct devlink_port_attrs *attrs = &port->attrs;
>+	struct devlink_port_pci_vf_attrs *pci_vf;
>+	int vf_id;
>+	u8 mac[ETH_ALEN];

Reverse xmas tree:
https://www.kernel.org/doc/html/v6.7/process/maintainer-netdev.html#tl-dr


>+
>+	if (attrs->flavour == DEVLINK_PORT_FLAVOUR_PCI_VF) {
>+		pci_vf = &attrs->pci_vf;
>+		vf_id = pci_vf->vf;
>+	} else {
>+		dev_err(dev, "Unable to get the vf id for PF %d\n", pf->hw.pf_id);

Fill the extack message instead.


>+		return -EADDRNOTAVAIL;
>+	}
>+
>+	if (!netdev) {
>+		dev_err(dev, "Unable to get the netdev for PF %d\n", pf->hw.pf_id);

Fill the extack message instead.


>+		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 +1697,8 @@ 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)
>