Commit f50f2127 authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller
Browse files

net: dsa: Add plumbing for port mirroring 



Add necessary plumbing at the slave network device level to have switch
drivers implement ndo_setup_tc() and most particularly the cls_matchall
classifier. We add support for two switch operations:

port_add_mirror and port_del_mirror() which configure, on a per-port
basis the mirror parameters requested from the cls_matchall classifier.

Code is largely borrowed from the Mellanox Spectrum switch driver.

Reviewed-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4be99934

include/net/dsa.h

+33 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include <linux/phy_fixed.h>

#include <linux/ethtool.h>



struct tc_action;



enum dsa_tag_protocol {

	DSA_TAG_PROTO_NONE = 0,

	DSA_TAG_PROTO_DSA,
@@ -139,6 +141,28 @@ struct dsa_switch_tree { 
	const struct dsa_device_ops *tag_ops;

};



/* TC matchall action types, only mirroring for now */

enum dsa_port_mall_action_type {

	DSA_PORT_MALL_MIRROR,

};



/* TC mirroring entry */

struct dsa_mall_mirror_tc_entry {

	u8 to_local_port;

	bool ingress;

};



/* TC matchall entry */

struct dsa_mall_tc_entry {

	struct list_head list;

	unsigned long cookie;

	enum dsa_port_mall_action_type type;

	union {

		struct dsa_mall_mirror_tc_entry mirror;

	};

};





struct dsa_port {

	struct dsa_switch	*ds;

	unsigned int		index;
@@ -385,6 +409,15 @@ struct dsa_switch_ops { 
			     struct ethtool_rxnfc *nfc, u32 *rule_locs);

	int	(*set_rxnfc)(struct dsa_switch *ds, int port,

			     struct ethtool_rxnfc *nfc);



	/*

	 * TC integration

	 */

	int	(*port_mirror_add)(struct dsa_switch *ds, int port,

				   struct dsa_mall_mirror_tc_entry *mirror,

				   bool ingress);

	void	(*port_mirror_del)(struct dsa_switch *ds, int port,

				   struct dsa_mall_mirror_tc_entry *mirror);

};



struct dsa_switch_driver {

net/dsa/dsa_priv.h

+3 −0
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ struct dsa_slave_priv { 
#ifdef CONFIG_NET_POLL_CONTROLLER

	struct netpoll		*netpoll;

#endif



	/* TC context */

	struct list_head	mall_tc_list;

};



/* dsa.c */

net/dsa/slave.c

+136 −1
Original line number Diff line number Diff line
@@ -16,12 +16,17 @@ 
#include <linux/of_net.h>

#include <linux/of_mdio.h>

#include <linux/mdio.h>

#include <linux/list.h>

#include <net/rtnetlink.h>

#include <net/switchdev.h>

#include <net/pkt_cls.h>

#include <net/tc_act/tc_mirred.h>

#include <linux/if_bridge.h>

#include <linux/netpoll.h>

#include "dsa_priv.h"



static bool dsa_slave_dev_check(struct net_device *dev);



/* slave mii_bus handling ***************************************************/

static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)

{
@@ -995,6 +1000,133 @@ static int dsa_slave_get_phys_port_name(struct net_device *dev, 
	return 0;

}



static struct dsa_mall_tc_entry *

dsa_slave_mall_tc_entry_find(struct dsa_slave_priv *p,

			     unsigned long cookie)

{

	struct dsa_mall_tc_entry *mall_tc_entry;



	list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)

		if (mall_tc_entry->cookie == cookie)

			return mall_tc_entry;



	return NULL;

}



static int dsa_slave_add_cls_matchall(struct net_device *dev,

				      __be16 protocol,

				      struct tc_cls_matchall_offload *cls,

				      bool ingress)

{

	struct dsa_slave_priv *p = netdev_priv(dev);

	struct dsa_mall_tc_entry *mall_tc_entry;

	struct dsa_switch *ds = p->dp->ds;

	struct net *net = dev_net(dev);

	struct dsa_slave_priv *to_p;

	struct net_device *to_dev;

	const struct tc_action *a;

	int err = -EOPNOTSUPP;

	LIST_HEAD(actions);

	int ifindex;



	if (!ds->ops->port_mirror_add)

		return err;



	if (!tc_single_action(cls->exts))

		return err;



	tcf_exts_to_list(cls->exts, &actions);

	a = list_first_entry(&actions, struct tc_action, list);



	if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {

		struct dsa_mall_mirror_tc_entry *mirror;



		ifindex = tcf_mirred_ifindex(a);

		to_dev = __dev_get_by_index(net, ifindex);

		if (!to_dev)

			return -EINVAL;



		if (!dsa_slave_dev_check(to_dev))

			return -EOPNOTSUPP;



		mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);

		if (!mall_tc_entry)

			return -ENOMEM;



		mall_tc_entry->cookie = cls->cookie;

		mall_tc_entry->type = DSA_PORT_MALL_MIRROR;

		mirror = &mall_tc_entry->mirror;



		to_p = netdev_priv(to_dev);



		mirror->to_local_port = to_p->dp->index;

		mirror->ingress = ingress;



		err = ds->ops->port_mirror_add(ds, p->dp->index, mirror,

					       ingress);

		if (err) {

			kfree(mall_tc_entry);

			return err;

		}



		list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);

	}



	return 0;

}



static void dsa_slave_del_cls_matchall(struct net_device *dev,

				       struct tc_cls_matchall_offload *cls)

{

	struct dsa_slave_priv *p = netdev_priv(dev);

	struct dsa_mall_tc_entry *mall_tc_entry;

	struct dsa_switch *ds = p->dp->ds;



	if (!ds->ops->port_mirror_del)

		return;



	mall_tc_entry = dsa_slave_mall_tc_entry_find(p, cls->cookie);

	if (!mall_tc_entry)

		return;



	list_del(&mall_tc_entry->list);



	switch (mall_tc_entry->type) {

	case DSA_PORT_MALL_MIRROR:

		ds->ops->port_mirror_del(ds, p->dp->index,

					 &mall_tc_entry->mirror);

		break;

	default:

		WARN_ON(1);

	}



	kfree(mall_tc_entry);

}



static int dsa_slave_setup_tc(struct net_device *dev, u32 handle,

			      __be16 protocol, struct tc_to_netdev *tc)

{

	bool ingress = TC_H_MAJ(handle) == TC_H_MAJ(TC_H_INGRESS);

	int ret = -EOPNOTSUPP;



	switch (tc->type) {

	case TC_SETUP_MATCHALL:

		switch (tc->cls_mall->command) {

		case TC_CLSMATCHALL_REPLACE:

			return dsa_slave_add_cls_matchall(dev, protocol,

							  tc->cls_mall,

							  ingress);

		case TC_CLSMATCHALL_DESTROY:

			dsa_slave_del_cls_matchall(dev, tc->cls_mall);

			return 0;

		}

	default:

		break;

	}



	return ret;

}



void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)

{

	ops->get_sset_count = dsa_cpu_port_get_sset_count;
@@ -1069,6 +1201,7 @@ static const struct net_device_ops dsa_slave_netdev_ops = { 
	.ndo_bridge_setlink	= switchdev_port_bridge_setlink,

	.ndo_bridge_dellink	= switchdev_port_bridge_dellink,

	.ndo_get_phys_port_name	= dsa_slave_get_phys_port_name,

	.ndo_setup_tc		= dsa_slave_setup_tc,

};



static const struct switchdev_ops dsa_slave_switchdev_ops = {
@@ -1285,7 +1418,8 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent, 
	if (slave_dev == NULL)

		return -ENOMEM;



	slave_dev->features = master->vlan_features;

	slave_dev->features = master->vlan_features | NETIF_F_HW_TC;

	slave_dev->hw_features |= NETIF_F_HW_TC;

	slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;

	eth_hw_addr_inherit(slave_dev, master);

	slave_dev->priv_flags |= IFF_NO_QUEUE;
@@ -1304,6 +1438,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent, 


	p = netdev_priv(slave_dev);

	p->dp = &ds->ports[port];

	INIT_LIST_HEAD(&p->mall_tc_list);

	p->xmit = dst->tag_ops->xmit;



	p->old_pause = -1;

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