netdev - Re: [PATCH v6 net-next 6/8] sfc: obtain device mac address based on firmware handle for ef100

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Date:   Fri, 10 Feb 2023 08:50:51 +0000
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     alejandro.lucero-palau@....com
Cc:     netdev@...r.kernel.org, linux-net-drivers@....com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, ecree.xilinx@...il.com,
        linux-doc@...r.kernel.org, corbet@....net, jiri@...dia.com
Subject: Re: [PATCH v6 net-next 6/8] sfc: obtain device mac address based on
 firmware handle for ef100

On Wed, Feb 08, 2023 at 02:25:17PM +0000, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alejandro.lucero-palau@....com>
> 
> Getting device mac address is currently based on a specific MCDI command
> only available for the PF. This patch changes the MCDI command to a
> generic one for PFs and VFs based on a client handle. This allows both
> PFs and VFs to ask for their mac address during initialization using the
> CLIENT_HANDLE_SELF.
> 
> Moreover, the patch allows other client handles which will be used by
> the PF to ask for mac addresses linked to VFs. This is necessary for
> suporting the port_function_hw_addr_get devlink function in further
> patches.
> 
> Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@....com>

Acked-by: Martin Habets <habetsm.xilinx@...il.com>

> ---
>  drivers/net/ethernet/sfc/ef100_netdev.c | 10 +++++++
>  drivers/net/ethernet/sfc/ef100_nic.c    | 37 +++++++++++++------------
>  drivers/net/ethernet/sfc/ef100_nic.h    |  2 ++
>  3 files changed, 31 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
> index 368147359299..d916877b5a9a 100644
> --- a/drivers/net/ethernet/sfc/ef100_netdev.c
> +++ b/drivers/net/ethernet/sfc/ef100_netdev.c
> @@ -359,6 +359,7 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
>  {
>  	struct efx_nic *efx = &probe_data->efx;
>  	struct efx_probe_data **probe_ptr;
> +	struct ef100_nic_data *nic_data;
>  	struct net_device *net_dev;
>  	int rc;
>  
> @@ -410,6 +411,15 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
>  	/* Don't fail init if RSS setup doesn't work. */
>  	efx_mcdi_push_default_indir_table(efx, efx->n_rx_channels);
>  
> +	nic_data = efx->nic_data;
> +	rc = ef100_get_mac_address(efx, net_dev->perm_addr, CLIENT_HANDLE_SELF,
> +				   efx->type->is_vf);
> +	if (rc)
> +		return rc;
> +	/* Assign MAC address */
> +	eth_hw_addr_set(net_dev, net_dev->perm_addr);
> +	ether_addr_copy(nic_data->port_id, net_dev->perm_addr);
> +
>  	/* devlink creation, registration and lock */
>  	rc = efx_probe_devlink_and_lock(efx);
>  	if (rc)
> diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
> index aa11f0925e27..aa48c79a2149 100644
> --- a/drivers/net/ethernet/sfc/ef100_nic.c
> +++ b/drivers/net/ethernet/sfc/ef100_nic.c
> @@ -130,23 +130,34 @@ static void ef100_mcdi_reboot_detected(struct efx_nic *efx)
>  
>  /*	MCDI calls
>   */
> -static int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address)
> +int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address,
> +			  int client_handle, bool empty_ok)
>  {
> -	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_MAC_ADDRESSES_OUT_LEN);
> +	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_CLIENT_MAC_ADDRESSES_OUT_LEN(1));
> +	MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_CLIENT_MAC_ADDRESSES_IN_LEN);
>  	size_t outlen;
>  	int rc;
>  
>  	BUILD_BUG_ON(MC_CMD_GET_MAC_ADDRESSES_IN_LEN != 0);
> +	MCDI_SET_DWORD(inbuf, GET_CLIENT_MAC_ADDRESSES_IN_CLIENT_HANDLE,
> +		       client_handle);
>  
> -	rc = efx_mcdi_rpc(efx, MC_CMD_GET_MAC_ADDRESSES, NULL, 0,
> -			  outbuf, sizeof(outbuf), &outlen);
> +	rc = efx_mcdi_rpc(efx, MC_CMD_GET_CLIENT_MAC_ADDRESSES, inbuf,
> +			  sizeof(inbuf), outbuf, sizeof(outbuf), &outlen);
>  	if (rc)
>  		return rc;
> -	if (outlen < MC_CMD_GET_MAC_ADDRESSES_OUT_LEN)
> -		return -EIO;
>  
> -	ether_addr_copy(mac_address,
> -			MCDI_PTR(outbuf, GET_MAC_ADDRESSES_OUT_MAC_ADDR_BASE));
> +	if (outlen >= MC_CMD_GET_CLIENT_MAC_ADDRESSES_OUT_LEN(1)) {
> +		ether_addr_copy(mac_address,
> +				MCDI_PTR(outbuf, GET_CLIENT_MAC_ADDRESSES_OUT_MAC_ADDRS));
> +	} else if (empty_ok) {
> +		pci_warn(efx->pci_dev,
> +			 "No MAC address provisioned for client ID %#x.\n",
> +			 client_handle);
> +		eth_zero_addr(mac_address);
> +	} else {
> +		return -ENOENT;
> +	}
>  	return 0;
>  }
>  
> @@ -1117,13 +1128,6 @@ int ef100_probe_netdev_pf(struct efx_nic *efx)
>  	struct net_device *net_dev = efx->net_dev;
>  	int rc;
>  
> -	rc = ef100_get_mac_address(efx, net_dev->perm_addr);
> -	if (rc)
> -		goto fail;
> -	/* Assign MAC address */
> -	eth_hw_addr_set(net_dev, net_dev->perm_addr);
> -	memcpy(nic_data->port_id, net_dev->perm_addr, ETH_ALEN);
> -
>  	if (!nic_data->grp_mae)
>  		return 0;
>  
> @@ -1163,9 +1167,6 @@ int ef100_probe_netdev_pf(struct efx_nic *efx)
>  		efx->fixed_features |= NETIF_F_HW_TC;
>  	}
>  #endif
> -	return 0;
> -
> -fail:
>  	return rc;
>  }
>  
> diff --git a/drivers/net/ethernet/sfc/ef100_nic.h b/drivers/net/ethernet/sfc/ef100_nic.h
> index 496aea43c60f..e59044072333 100644
> --- a/drivers/net/ethernet/sfc/ef100_nic.h
> +++ b/drivers/net/ethernet/sfc/ef100_nic.h
> @@ -92,4 +92,6 @@ int efx_ef100_init_datapath_caps(struct efx_nic *efx);
>  int ef100_phy_probe(struct efx_nic *efx);
>  int ef100_filter_table_probe(struct efx_nic *efx);
>  
> +int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address,
> +			  int client_handle, bool empty_ok);
>  #endif	/* EFX_EF100_NIC_H */
> -- 
> 2.17.1