netdev - Re: [PATCH net-next 1/2] nfp: initialize netdev's dev

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Date:   Wed, 29 Mar 2023 21:49:59 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Louis Peens <louis.peens@...igine.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Simon Horman <simon.horman@...igine.com>,
        netdev@...r.kernel.org, oss-drivers@...igine.com,
        Yinjun Zhang <yinjun.zhang@...igine.com>
Subject: Re: [PATCH net-next 1/2] nfp: initialize netdev's dev_port with
 correct id

On Wed, Mar 29, 2023 at 04:45:47PM +0200, Louis Peens wrote:
> From: Yinjun Zhang <yinjun.zhang@...igine.com>
> 
> `dev_port` is used to differentiate devices that share the same
> function, which is the case in most of NFP NICs.

And how did it work without dev_port?
I have no idea what does it mean "different devices that share the same
function".

Thanks

> 
> In some customized scenario, `dev_port` is used to rename netdev
> instead of `phys_port_name`, which requires to initialize it
> correctly to get expected netdev name.
> 
> Example rules using `dev_port`:
> 
>   SUBSYSTEM=="net", ACTION=="add", KERNELS=="0000:e1:00.0", ATTR{dev_port}=="0", NAME:="ens8np0"
>   SUBSYSTEM=="net", ACTION=="add", KERNELS=="0000:e1:00.0", ATTR{dev_port}=="1", NAME:="ens8np1"
> 
> Signed-off-by: Yinjun Zhang <yinjun.zhang@...igine.com>
> Acked-by: Simon Horman <simon.horman@...igine.com>
> Signed-off-by: Louis Peens <louis.peens@...igine.com>
> ---
>  drivers/net/ethernet/netronome/nfp/nfp_port.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/netronome/nfp/nfp_port.c b/drivers/net/ethernet/netronome/nfp/nfp_port.c
> index 4f2308570dcf..54640bcb70fb 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfp_port.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_port.c
> @@ -189,6 +189,7 @@ int nfp_port_init_phy_port(struct nfp_pf *pf, struct nfp_app *app,
>  
>  	port->eth_port = &pf->eth_tbl->ports[id];
>  	port->eth_id = pf->eth_tbl->ports[id].index;
> +	port->netdev->dev_port = id;
>  	if (pf->mac_stats_mem)
>  		port->eth_stats =
>  			pf->mac_stats_mem + port->eth_id * NFP_MAC_STATS_SIZE;
> -- 
> 2.34.1
>