Subject: Re: [RFC PATCH net-next v2 1/1] net: Support for switch port configuration

From: Roopa Prabhu <[email-masked]>
Date: Thu, 18 Dec 2014 07:16:19 -0800

On 12/18/14, 6:55 AM, Varlese, Marco wrote:
>> -----Original Message-----
>> From: Roopa Prabhu [mailto:[email-masked]]
>> Sent: Thursday, December 18, 2014 2:45 PM
>> To: Varlese, Marco
>> Cc: [email-masked]; Fastabend, John R; Thomas Graf; Jiri Pirko;
>> [email-masked]; [email-masked]
>> Subject: Re: [RFC PATCH net-next v2 1/1] net: Support for switch port
>> configuration
>>
>> On 12/18/14, 3:29 AM, Varlese, Marco wrote:
>>> From: Marco Varlese <[email-masked]>
>>>
>>> Switch hardware offers a list of attributes that are configurable on a
>>> per port basis.
>>> This patch provides a mechanism to configure switch ports by adding an
>>> NDO for setting specific values to specific attributes.
>>> There will be a separate patch that adds the "get" functionality via
>>> another NDO and another patch that extends iproute2 to call the two
>>> new NDOs.
>>>
>>> Signed-off-by: Marco Varlese <[email-masked]>
>>> ---
>>>    include/linux/netdevice.h    |  5 ++++
>>>    include/uapi/linux/if_link.h | 15 ++++++++++++
>>>    net/core/rtnetlink.c         | 54
>> ++++++++++++++++++++++++++++++++++++++++++++
>>>    3 files changed, 74 insertions(+)
>>>
>>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>>> index c31f74d..4881c7b 100644
>>> --- a/include/linux/netdevice.h
>>> +++ b/include/linux/netdevice.h
>>> @@ -1027,6 +1027,9 @@ typedef u16 (*select_queue_fallback_t)(struct
>> net_device *dev,
>>>     * int (*ndo_switch_port_stp_update)(struct net_device *dev, u8 state);
>>>     *	Called to notify switch device port of bridge port STP
>>>     *	state change.
>>> + * int (*ndo_switch_port_set_cfg)(struct net_device *dev,
>>> + *                                u32 attr, u64 value);
>>> + *	Called to set specific switch ports attributes.
>>>     */
>>>    struct net_device_ops {
>>>    	int			(*ndo_init)(struct net_device *dev);
>>> @@ -1185,6 +1188,8 @@ struct net_device_ops {
>>>    							    struct
>> netdev_phys_item_id *psid);
>>>    	int			(*ndo_switch_port_stp_update)(struct
>> net_device *dev,
>>>    							      u8 state);
>>> +	int			(*ndo_switch_port_set_cfg)(struct
>> net_device *dev,
>>> +							   u32 attr, u64 value);
>>>    #endif
>>>    };
>>>
>>> diff --git a/include/uapi/linux/if_link.h
>>> b/include/uapi/linux/if_link.h index f7d0d2d..19cb51a 100644
>>> --- a/include/uapi/linux/if_link.h
>>> +++ b/include/uapi/linux/if_link.h
>>> @@ -146,6 +146,7 @@ enum {
>>>    	IFLA_PHYS_PORT_ID,
>>>    	IFLA_CARRIER_CHANGES,
>>>    	IFLA_PHYS_SWITCH_ID,
>>> +	IFLA_SWITCH_PORT_CFG,
>>>    	__IFLA_MAX
>>>    };
>>>
>>> @@ -603,4 +604,18 @@ enum {
>>>
>>>    #define IFLA_HSR_MAX (__IFLA_HSR_MAX - 1)
>>>
>>> +/* Switch Port Attributes section */
>>> +
>>> +enum {
>>> +	IFLA_ATTR_UNSPEC,
>>> +	IFLA_ATTR_LEARNING,
>> Any reason you want learning here ?. This is covered as part  of the bridge
>> setlink attributes.
>>
> Yes, because the user may _not_ want to go through a bridge interface necessarily.
But, the bridge setlink/getlink interface was changed to accommodate 
'self' for exactly such cases.
I kind of understand your case for the other attributes (these are per 
port settings that switch asics provide).

However, i don't understand the reason to pull in bridge attributes here.

>
>>> +	IFLA_ATTR_LOOPBACK,
>>> +	IFLA_ATTR_BCAST_FLOODING,
>>> +	IFLA_ATTR_UCAST_FLOODING,
>>> +	IFLA_ATTR_MCAST_FLOODING,
>>> +	__IFLA_ATTR_MAX
>>> +};
>>> +
>>> +#define IFLA_ATTR_MAX (__IFLA_ATTR_MAX - 1)
>>> +
>>>    #endif /* _UAPI_LINUX_IF_LINK_H */
>>> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index
>>> eaa057f..c0d1c45 100644
>>> --- a/net/core/rtnetlink.c
>>> +++ b/net/core/rtnetlink.c
>>> @@ -1389,6 +1389,46 @@ static int validate_linkmsg(struct net_device
>> *dev, struct nlattr *tb[])
>>>    	return 0;
>>>    }
>>>
>>> +#ifdef CONFIG_NET_SWITCHDEV
>>> +static int do_setswcfg(struct net_device *dev, struct nlattr *attr) {
>>> +	int rem, err = -EINVAL;
>>> +	struct nlattr *v;
>>> +	const struct net_device_ops *ops = dev->netdev_ops;
>>> +
>>> +	nla_for_each_nested(v, attr, rem) {
>>> +		u32 op = nla_type(v);
>>> +		u64 value = 0;
>>> +
>>> +		switch (op) {
>>> +		case IFLA_ATTR_LEARNING:
>>> +		case IFLA_ATTR_LOOPBACK:
>>> +		case IFLA_ATTR_BCAST_FLOODING:
>>> +		case IFLA_ATTR_UCAST_FLOODING:
>>> +		case IFLA_ATTR_MCAST_FLOODING: {
>>> +			if (nla_len(v) < sizeof(value)) {
>>> +				err = -EINVAL;
>>> +				break;
>>> +			}
>>> +
>>> +			value = nla_get_u64(v);
>>> +			err = ops->ndo_switch_port_set_cfg(dev,
>>> +							   op,
>>> +							   value);
>>> +			break;
>>> +		}
>>> +		default:
>>> +			err = -EINVAL;
>>> +			break;
>>> +		}
>>> +		if (err)
>>> +			break;
>>> +	}
>>> +	return err;
>>> +}
>>> +
>>> +#endif
>>> +
>>>    static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
>>>    {
>>>    	int rem, err = -EINVAL;
>>> @@ -1740,6 +1780,20 @@ static int do_setlink(const struct sk_buff *skb,
>>>    			status |= DO_SETLINK_NOTIFY;
>>>    		}
>>>    	}
>>> +#ifdef CONFIG_NET_SWITCHDEV
>>> +	if (tb[IFLA_SWITCH_PORT_CFG]) {
>>> +		err = -EOPNOTSUPP;
>>> +		if (!ops->ndo_switch_port_set_cfg)
>>> +			goto errout;
>>> +		if (!ops->ndo_switch_parent_id_get)
>>> +			goto errout;
>>> +		err = do_setswcfg(dev, tb[IFLA_SWITCH_PORT_CFG]);
>>> +		if (err < 0)
>>> +			goto errout;
>>> +
>>> +		status |= DO_SETLINK_NOTIFY;
>>> +	}
>>> +#endif
>>>    	err = 0;
>>>
>>>    errout:
> --
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