netdev - Re: [PATCH net-next v2 1/3] devlink: Introduce PCI PF port flavour and port attribute

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Message-ID: <20190705121722.269711ed@cakuba.netronome.com>
Date:   Fri, 5 Jul 2019 12:17:22 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Parav Pandit <parav@...lanox.com>
Cc:     netdev@...r.kernel.org, jiri@...lanox.com, saeedm@...lanox.com
Subject: Re: [PATCH net-next v2 1/3] devlink: Introduce PCI PF port flavour
 and port attribute

On Fri,  5 Jul 2019 02:37:09 -0500, Parav Pandit wrote:
> @@ -38,14 +38,24 @@ struct devlink {
>  	char priv[0] __aligned(NETDEV_ALIGN);
>  };
>  
> +struct devlink_port_pci_pf_attrs {
> +	u16 pf;	/* Associated PCI PF for this port. */
> +};
> +
>  struct devlink_port_attrs {
>  	u8 set:1,
>  	   split:1,
>  	   switch_port:1;
>  	enum devlink_port_flavour flavour;
> -	u32 port_number; /* same value as "split group" */
> +	u32 port_number; /* same value as "split group".
> +			  * Valid only when a port is physical and visible
> +			  * to the user for a given port flavour.
> +			  */

port_number can be in the per-flavour union below.

>  	u32 split_subport_number;

As can split_subport_number.

>  	struct netdev_phys_item_id switch_id;
> +	union {
> +		struct devlink_port_pci_pf_attrs pci_pf;
> +	};
>  };
>  
>  struct devlink_port {

> @@ -515,8 +523,14 @@ static int devlink_nl_port_attrs_put(struct sk_buff *msg,
>  		return 0;
>  	if (nla_put_u16(msg, DEVLINK_ATTR_PORT_FLAVOUR, attrs->flavour))
>  		return -EMSGSIZE;
> -	if (nla_put_u32(msg, DEVLINK_ATTR_PORT_NUMBER, attrs->port_number))
> +	if (is_devlink_phy_port_num_supported(devlink_port) &&
> +	    nla_put_u32(msg, DEVLINK_ATTR_PORT_NUMBER, attrs->port_number))
>  		return -EMSGSIZE;
> +	if (devlink_port->attrs.flavour == DEVLINK_PORT_FLAVOUR_PCI_PF) {
> +		if (nla_put_u16(msg, DEVLINK_ATTR_PORT_PCI_PF_NUMBER,
> +				attrs->pci_pf.pf))
> +			return -EMSGSIZE;
> +	}
>  	if (!attrs->split)
>  		return 0;
>  	if (nla_put_u32(msg, DEVLINK_ATTR_PORT_SPLIT_GROUP, attrs->port_number))

Split attributes as well, please:

On Tue, 2 Jul 2019 16:42:52 -0700, Jakub Kicinski wrote:
> port_number, and split attributes should not be exposed for PCI ports.

We have no clear semantics for those, yet, and the phys_port_name
implementation in this patch doesn't handle split PCI, so let's leave
them out for now.