net-sysfs: expose physical switch id for particular device
Signed-off-by: Jiri Pirko <jiri@resnulli.us> Reviewed-by: Thomas Graf <tgraf@suug.ch> Acked-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Andy Gospodarek <gospo@cumulusnetworks.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -216,3 +216,11 @@ Contact: netdev@vger.kernel.org
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Description:
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Indicates the interface protocol type as a decimal value. See
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include/uapi/linux/if_arp.h for all possible values.
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What: /sys/class/net/<iface>/phys_switch_id
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Date: November 2014
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KernelVersion: 3.19
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Contact: netdev@vger.kernel.org
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Description:
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Indicates the unique physical switch identifier of a switch this
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port belongs to, as a string.
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@ -12,6 +12,7 @@
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#include <linux/capability.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/switchdev.h>
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#include <linux/if_arp.h>
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#include <linux/slab.h>
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#include <linux/nsproxy.h>
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@ -416,6 +417,28 @@ static ssize_t phys_port_id_show(struct device *dev,
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}
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static DEVICE_ATTR_RO(phys_port_id);
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static ssize_t phys_switch_id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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ssize_t ret = -EINVAL;
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if (!rtnl_trylock())
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return restart_syscall();
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if (dev_isalive(netdev)) {
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struct netdev_phys_item_id ppid;
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ret = netdev_switch_parent_id_get(netdev, &ppid);
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if (!ret)
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ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
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}
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rtnl_unlock();
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return ret;
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}
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static DEVICE_ATTR_RO(phys_switch_id);
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static struct attribute *net_class_attrs[] = {
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&dev_attr_netdev_group.attr,
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&dev_attr_type.attr,
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@ -441,6 +464,7 @@ static struct attribute *net_class_attrs[] = {
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&dev_attr_tx_queue_len.attr,
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&dev_attr_gro_flush_timeout.attr,
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&dev_attr_phys_port_id.attr,
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&dev_attr_phys_switch_id.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(net_class);
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