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Commit 98cdb480 authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller
Browse files

net: dsa: Expose tagging protocol to user-space 



There is no way for user-space to know what a given DSA network device's
tagging protocol is. Expose this information through a dsa/tagging
attribute which reflects the tagging protocol currently in use.

This is helpful for configuration (e.g: none behaves dramatically
different wrt. bridges) as well as for packet capture tools when there
is not a proper Ethernet type available.

Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0fdc0d67

Documentation/ABI/testing/sysfs-class-net-dsa

0 → 100644
+7 −0
Original line number Diff line number Diff line 
What:		/sys/class/net/<iface>/tagging

Date:		August 2018

KernelVersion:	4.20

Contact:	netdev@vger.kernel.org

Description:

		String indicating the type of tagging protocol used by the

		DSA slave network device.

net/dsa/dsa.c

+43 −0
Original line number Diff line number Diff line
@@ -70,6 +70,49 @@ const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = { 
	[DSA_TAG_PROTO_NONE] = &none_ops,

};



const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)

{

	const char *protocol_name[DSA_TAG_LAST] = {

#ifdef CONFIG_NET_DSA_TAG_BRCM

		[DSA_TAG_PROTO_BRCM] = "brcm",

#endif

#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND

		[DSA_TAG_PROTO_BRCM_PREPEND] = "brcm-prepend",

#endif

#ifdef CONFIG_NET_DSA_TAG_DSA

		[DSA_TAG_PROTO_DSA] = "dsa",

#endif

#ifdef CONFIG_NET_DSA_TAG_EDSA

		[DSA_TAG_PROTO_EDSA] = "edsa",

#endif

#ifdef CONFIG_NET_DSA_TAG_KSZ

		[DSA_TAG_PROTO_KSZ] = "ksz",

#endif

#ifdef CONFIG_NET_DSA_TAG_LAN9303

		[DSA_TAG_PROTO_LAN9303] = "lan9303",

#endif

#ifdef CONFIG_NET_DSA_TAG_MTK

		[DSA_TAG_PROTO_MTK] = "mtk",

#endif

#ifdef CONFIG_NET_DSA_TAG_QCA

		[DSA_TAG_PROTO_QCA] = "qca",

#endif

#ifdef CONFIG_NET_DSA_TAG_TRAILER

		[DSA_TAG_PROTO_TRAILER] = "trailer",

#endif

		[DSA_TAG_PROTO_NONE] = "none",

	};

	unsigned int i;



	BUILD_BUG_ON(ARRAY_SIZE(protocol_name) != DSA_TAG_LAST);



	for (i = 0; i < ARRAY_SIZE(dsa_device_ops); i++)

		if (ops == dsa_device_ops[i])

			return protocol_name[i];



	return protocol_name[DSA_TAG_PROTO_NONE];

};



const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)

{

	const struct dsa_device_ops *ops;

net/dsa/dsa_priv.h

+1 −0
Original line number Diff line number Diff line
@@ -86,6 +86,7 @@ struct dsa_slave_priv { 
/* dsa.c */

const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol);

bool dsa_schedule_work(struct work_struct *work);

const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops);



/* legacy.c */

#if IS_ENABLED(CONFIG_NET_DSA_LEGACY)

net/dsa/slave.c

+28 −0
Original line number Diff line number Diff line
@@ -1058,6 +1058,27 @@ static struct device_type dsa_type = { 
	.name	= "dsa",

};



static ssize_t tagging_show(struct device *d, struct device_attribute *attr,

			    char *buf)

{

	struct net_device *dev = to_net_dev(d);

	struct dsa_port *dp = dsa_slave_to_port(dev);



	return sprintf(buf, "%s\n",

		       dsa_tag_protocol_to_str(dp->cpu_dp->tag_ops));

}

static DEVICE_ATTR_RO(tagging);



static struct attribute *dsa_slave_attrs[] = {

	&dev_attr_tagging.attr,

	NULL

};



static const struct attribute_group dsa_group = {

	.name	= "dsa",

	.attrs	= dsa_slave_attrs,

};



static void dsa_slave_phylink_validate(struct net_device *dev,

				       unsigned long *supported,

				       struct phylink_link_state *state)
@@ -1353,8 +1374,14 @@ int dsa_slave_create(struct dsa_port *port) 
		goto out_phy;

	}



	ret = sysfs_create_group(&slave_dev->dev.kobj, &dsa_group);

	if (ret)

		goto out_unreg;



	return 0;



out_unreg:

	unregister_netdev(slave_dev);

out_phy:

	rtnl_lock();

	phylink_disconnect_phy(p->dp->pl);
@@ -1378,6 +1405,7 @@ void dsa_slave_destroy(struct net_device *slave_dev) 
	rtnl_unlock();



	dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);

	sysfs_remove_group(&slave_dev->dev.kobj, &dsa_group);

	unregister_netdev(slave_dev);

	phylink_destroy(dp->pl);

	free_percpu(p->stats64);