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Commit aecbe01e authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

net-sysfs: expose physical switch id for particular device 



Signed-off-by: default avatarJiri Pirko <jiri@resnulli.us>
Reviewed-by: default avatarThomas Graf <tgraf@suug.ch>
Acked-by: default avatarJohn Fastabend <john.r.fastabend@intel.com>
Acked-by: default avatarAndy Gospodarek <gospo@cumulusnetworks.com>
Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 82f28412

Documentation/ABI/testing/sysfs-class-net

+8 −0
Original line number Diff line number Diff line
@@ -216,3 +216,11 @@ Contact: netdev@vger.kernel.org 
Description:

		Indicates the interface protocol type as a decimal value. See

		include/uapi/linux/if_arp.h for all possible values.



What:		/sys/class/net/<iface>/phys_switch_id

Date:		November 2014

KernelVersion:	3.19

Contact:	netdev@vger.kernel.org

Description:

		Indicates the unique physical switch identifier of a switch this

		port belongs to, as a string.

net/core/net-sysfs.c

+24 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/capability.h>

#include <linux/kernel.h>

#include <linux/netdevice.h>

#include <net/switchdev.h>

#include <linux/if_arp.h>

#include <linux/slab.h>

#include <linux/nsproxy.h>
@@ -416,6 +417,28 @@ static ssize_t phys_port_id_show(struct device *dev, 
}

static DEVICE_ATTR_RO(phys_port_id);



static ssize_t phys_switch_id_show(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	struct net_device *netdev = to_net_dev(dev);

	ssize_t ret = -EINVAL;



	if (!rtnl_trylock())

		return restart_syscall();



	if (dev_isalive(netdev)) {

		struct netdev_phys_item_id ppid;



		ret = netdev_switch_parent_id_get(netdev, &ppid);

		if (!ret)

			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);

	}

	rtnl_unlock();



	return ret;

}

static DEVICE_ATTR_RO(phys_switch_id);



static struct attribute *net_class_attrs[] = {

	&dev_attr_netdev_group.attr,

	&dev_attr_type.attr,
@@ -441,6 +464,7 @@ static struct attribute *net_class_attrs[] = { 
	&dev_attr_tx_queue_len.attr,

	&dev_attr_gro_flush_timeout.attr,

	&dev_attr_phys_port_id.attr,

	&dev_attr_phys_switch_id.attr,

	NULL,

};

ATTRIBUTE_GROUPS(net_class);