netdev - [patch net-next v6 3/4] net: export physical port id via sysfs

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Message-Id: <1375114612-537-4-git-send-email-jiri@resnulli.us>
Date:	Mon, 29 Jul 2013 18:16:51 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, stephen@...workplumber.org,
	Narendra_K@...l.com, bhutchings@...arflare.com,
	john.r.fastabend@...el.com, or.gerlitz@...il.com,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, gregory.v.rose@...el.com,
	peter.p.waskiewicz.jr@...el.com, alexander.h.duyck@...el.com,
	john.ronciak@...el.com, tushar.n.dave@...el.com,
	matthew.vick@...el.com, mitch.a.williams@...el.com,
	vyasevic@...hat.com, amwang@...hat.com, johannes@...solutions.net,
	Narendra K <narendra_k@...l.com>
Subject: [patch net-next v6 3/4] net: export physical port id via sysfs

Signed-off-by: Jiri Pirko <jiri@...nulli.us>
Acked-by: Ben Hutchings <bhutchings@...arflare.com>
Signed-off-by: Narendra K <narendra_k@...l.com>
---
 net/core/net-sysfs.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 981fed3..8826b0d 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -334,6 +334,27 @@ static ssize_t store_group(struct device *dev, struct device_attribute *attr,
 	return netdev_store(dev, attr, buf, len, change_group);
 }
 
+static ssize_t show_phys_port_id(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_port_id ppid;
+
+		ret = dev_get_phys_port_id(netdev, &ppid);
+		if (!ret)
+			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
+	}
+	rtnl_unlock();
+
+	return ret;
+}
+
 static struct device_attribute net_class_attributes[] = {
 	__ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
 	__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
@@ -355,6 +376,7 @@ static struct device_attribute net_class_attributes[] = {
 	__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 	       store_tx_queue_len),
 	__ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
+	__ATTR(phys_port_id, S_IRUGO, show_phys_port_id, NULL),
 	{}
 };
 
-- 
1.8.1.4

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