From 6d3c8c0dd88a5ffc7e3695997641e4b6d4c11065 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 13 Jun 2017 13:27:19 -0700
Subject: [PATCH 1/4] net: dsa: Remove master_netdev and use
 dst->cpu_dp->netdev

In preparation for supporting multiple CPU ports, remove
dst->master_netdev and ds->master_netdev and replace them with only one
instance of the common object we have for a port: struct
dsa_port::netdev. ds->master_netdev is currently write only and would be
helpful in the case where we have two switches, both with CPU ports, and
also connected within each other, which the multi-CPU port patch series
would address.

While at it, introduce a helper function used in net/dsa/slave.c to
immediately get a reference on the master network device called
dsa_master_netdev().

Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/dsa/bcm_sf2.c |  4 ++--
 drivers/net/dsa/mt7530.c  |  4 ++--
 include/net/dsa.h         |  5 -----
 net/dsa/dsa.c             |  9 ++-------
 net/dsa/dsa2.c            | 18 +++++++-----------
 net/dsa/dsa_priv.h        |  5 +++++
 net/dsa/legacy.c          | 22 +++++++++++++---------
 net/dsa/slave.c           | 21 +++++++++------------
 8 files changed, 40 insertions(+), 48 deletions(-)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 687a8bae5d73..76e98e8ed315 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -806,7 +806,7 @@ static int bcm_sf2_sw_resume(struct dsa_switch *ds)
 static void bcm_sf2_sw_get_wol(struct dsa_switch *ds, int port,
 			       struct ethtool_wolinfo *wol)
 {
-	struct net_device *p = ds->dst[ds->index].master_netdev;
+	struct net_device *p = ds->dst[ds->index].cpu_dp->netdev;
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
 	struct ethtool_wolinfo pwol;
 
@@ -829,7 +829,7 @@ static void bcm_sf2_sw_get_wol(struct dsa_switch *ds, int port,
 static int bcm_sf2_sw_set_wol(struct dsa_switch *ds, int port,
 			      struct ethtool_wolinfo *wol)
 {
-	struct net_device *p = ds->dst[ds->index].master_netdev;
+	struct net_device *p = ds->dst[ds->index].cpu_dp->netdev;
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
 	s8 cpu_port = ds->dst->cpu_dp->index;
 	struct ethtool_wolinfo pwol;
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 25e00d5e0eec..1e46418a3b74 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -912,11 +912,11 @@ mt7530_setup(struct dsa_switch *ds)
 	struct device_node *dn;
 	struct mt7530_dummy_poll p;
 
-	/* The parent node of master_netdev which holds the common system
+	/* The parent node of cpu_dp->netdev which holds the common system
 	 * controller also is the container for two GMACs nodes representing
 	 * as two netdev instances.
 	 */
-	dn = ds->master_netdev->dev.of_node->parent;
+	dn = ds->dst->cpu_dp->netdev->dev.of_node->parent;
 	priv->ethernet = syscon_node_to_regmap(dn);
 	if (IS_ERR(priv->ethernet))
 		return PTR_ERR(priv->ethernet);
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 2effb0af9d7c..b2fb53f5e28e 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -226,11 +226,6 @@ struct dsa_switch {
 	 */
 	s8		rtable[DSA_MAX_SWITCHES];
 
-	/*
-	 * The lower device this switch uses to talk to the host
-	 */
-	struct net_device *master_netdev;
-
 	/*
 	 * Slave mii_bus and devices for the individual ports.
 	 */
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 517215391514..6aacc2314a8f 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -118,10 +118,7 @@ int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
 	struct net_device *master;
 	struct ethtool_ops *cpu_ops;
 
-	master = ds->dst->master_netdev;
-	if (ds->master_netdev)
-		master = ds->master_netdev;
-
+	master = ds->dst->cpu_dp->netdev;
 	cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 	if (!cpu_ops)
 		return -ENOMEM;
@@ -142,9 +139,7 @@ void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
 	struct dsa_switch *ds = cpu_dp->ds;
 	struct net_device *master;
 
-	master = ds->dst->master_netdev;
-	if (ds->master_netdev)
-		master = ds->master_netdev;
+	master = ds->dst->cpu_dp->netdev;
 
 	master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
 }
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index f88e1dddb74a..ab48c4f989da 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -337,7 +337,7 @@ static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
 		return err;
 
 	if (ds->ops->set_addr) {
-		err = ds->ops->set_addr(ds, dst->master_netdev->dev_addr);
+		err = ds->ops->set_addr(ds, dst->cpu_dp->netdev->dev_addr);
 		if (err < 0)
 			return err;
 	}
@@ -444,7 +444,7 @@ static int dsa_dst_apply(struct dsa_switch_tree *dst)
 	 * sent to the tag format's receive function.
 	 */
 	wmb();
-	dst->master_netdev->dsa_ptr = dst;
+	dst->cpu_dp->netdev->dsa_ptr = dst;
 	dst->applied = true;
 
 	return 0;
@@ -458,7 +458,7 @@ static void dsa_dst_unapply(struct dsa_switch_tree *dst)
 	if (!dst->applied)
 		return;
 
-	dst->master_netdev->dsa_ptr = NULL;
+	dst->cpu_dp->netdev->dsa_ptr = NULL;
 
 	/* If we used a tagging format that doesn't have an ethertype
 	 * field, make sure that all packets from this point get sent
@@ -504,14 +504,10 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
 	if (!ethernet_dev)
 		return -EPROBE_DEFER;
 
-	if (!ds->master_netdev)
-		ds->master_netdev = ethernet_dev;
-
-	if (!dst->master_netdev)
-		dst->master_netdev = ethernet_dev;
-
-	if (!dst->cpu_dp)
+	if (!dst->cpu_dp) {
 		dst->cpu_dp = port;
+		dst->cpu_dp->netdev = ethernet_dev;
+	}
 
 	tag_protocol = ds->ops->get_tag_protocol(ds);
 	dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
@@ -578,7 +574,7 @@ static int dsa_dst_parse(struct dsa_switch_tree *dst)
 			return err;
 	}
 
-	if (!dst->master_netdev) {
+	if (!dst->cpu_dp->netdev) {
 		pr_warn("Tree has no master device\n");
 		return -EINVAL;
 	}
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 66ee248796c8..5c510f4ba0ce 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -183,4 +183,9 @@ extern const struct dsa_device_ops qca_netdev_ops;
 /* tag_trailer.c */
 extern const struct dsa_device_ops trailer_netdev_ops;
 
+static inline struct net_device *dsa_master_netdev(struct dsa_slave_priv *p)
+{
+	return p->dp->ds->dst->cpu_dp->netdev;
+}
+
 #endif
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 3a56de8f51a8..5d4f6ffa3424 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -101,9 +101,12 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 	struct dsa_switch_tree *dst = ds->dst;
 	struct dsa_chip_data *cd = ds->cd;
 	bool valid_name_found = false;
+	struct net_device *master;
 	int index = ds->index;
 	int i, ret;
 
+	master = dst->cpu_dp->netdev;
+
 	/*
 	 * Validate supplied switch configuration.
 	 */
@@ -116,7 +119,7 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 
 		if (!strcmp(name, "cpu")) {
 			if (dst->cpu_dp) {
-				netdev_err(dst->master_netdev,
+				netdev_err(master,
 					   "multiple cpu ports?!\n");
 				return -EINVAL;
 			}
@@ -168,7 +171,7 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 		return ret;
 
 	if (ops->set_addr) {
-		ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
+		ret = ops->set_addr(ds, master->dev_addr);
 		if (ret < 0)
 			return ret;
 	}
@@ -195,14 +198,14 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 
 		ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 		if (ret < 0)
-			netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
+			netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 				   index, i, cd->port_names[i], ret);
 	}
 
 	/* Perform configuration of the CPU and DSA ports */
 	ret = dsa_cpu_dsa_setups(ds, parent);
 	if (ret < 0)
-		netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
+		netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
 			   index);
 
 	ret = dsa_cpu_port_ethtool_setup(ds->dst->cpu_dp);
@@ -217,6 +220,7 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 		 struct device *parent, struct device *host_dev)
 {
 	struct dsa_chip_data *cd = dst->pd->chip + index;
+	struct net_device *master = dst->cpu_dp->netdev;
 	const struct dsa_switch_ops *ops;
 	struct dsa_switch *ds;
 	int ret;
@@ -228,11 +232,11 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 	 */
 	ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 	if (!ops) {
-		netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
+		netdev_err(master, "[%d]: could not detect attached switch\n",
 			   index);
 		return ERR_PTR(-EINVAL);
 	}
-	netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
+	netdev_info(master, "[%d]: detected a %s switch\n",
 		    index, name);
 
 
@@ -575,7 +579,7 @@ static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 	unsigned configured = 0;
 
 	dst->pd = pd;
-	dst->master_netdev = dev;
+	dst->cpu_dp->netdev = dev;
 
 	for (i = 0; i < pd->nr_chips; i++) {
 		struct dsa_switch *ds;
@@ -671,7 +675,7 @@ static void dsa_remove_dst(struct dsa_switch_tree *dst)
 {
 	int i;
 
-	dst->master_netdev->dsa_ptr = NULL;
+	dst->cpu_dp->netdev->dsa_ptr = NULL;
 
 	/* If we used a tagging format that doesn't have an ethertype
 	 * field, make sure that all packets from this point get sent
@@ -688,7 +692,7 @@ static void dsa_remove_dst(struct dsa_switch_tree *dst)
 
 	dsa_cpu_port_ethtool_restore(dst->cpu_dp);
 
-	dev_put(dst->master_netdev);
+	dev_put(dst->cpu_dp->netdev);
 }
 
 static int dsa_remove(struct platform_device *pdev)
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 5e45ae5c3f71..658bc67c5320 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -66,7 +66,7 @@ static int dsa_slave_get_iflink(const struct net_device *dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
 
-	return p->dp->ds->dst->master_netdev->ifindex;
+	return dsa_master_netdev(p)->ifindex;
 }
 
 static int dsa_slave_open(struct net_device *dev)
@@ -74,7 +74,7 @@ static int dsa_slave_open(struct net_device *dev)
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_port *dp = p->dp;
 	struct dsa_switch *ds = dp->ds;
-	struct net_device *master = ds->dst->master_netdev;
+	struct net_device *master = dsa_master_netdev(p);
 	u8 stp_state = dp->bridge_dev ? BR_STATE_BLOCKING : BR_STATE_FORWARDING;
 	int err;
 
@@ -127,7 +127,7 @@ out:
 static int dsa_slave_close(struct net_device *dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
-	struct net_device *master = p->dp->ds->dst->master_netdev;
+	struct net_device *master = dsa_master_netdev(p);
 	struct dsa_switch *ds = p->dp->ds;
 
 	if (p->phy)
@@ -154,7 +154,7 @@ static int dsa_slave_close(struct net_device *dev)
 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
-	struct net_device *master = p->dp->ds->dst->master_netdev;
+	struct net_device *master = dsa_master_netdev(p);
 
 	if (change & IFF_ALLMULTI)
 		dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
@@ -165,7 +165,7 @@ static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 static void dsa_slave_set_rx_mode(struct net_device *dev)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
-	struct net_device *master = p->dp->ds->dst->master_netdev;
+	struct net_device *master = dsa_master_netdev(p);
 
 	dev_mc_sync(master, dev);
 	dev_uc_sync(master, dev);
@@ -174,7 +174,7 @@ static void dsa_slave_set_rx_mode(struct net_device *dev)
 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
-	struct net_device *master = p->dp->ds->dst->master_netdev;
+	struct net_device *master = dsa_master_netdev(p);
 	struct sockaddr *addr = a;
 	int err;
 
@@ -375,7 +375,7 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* Queue the SKB for transmission on the parent interface, but
 	 * do not modify its EtherType
 	 */
-	nskb->dev = p->dp->ds->dst->master_netdev;
+	nskb->dev = dsa_master_netdev(p);
 	dev_queue_xmit(nskb);
 
 	return NETDEV_TX_OK;
@@ -684,8 +684,7 @@ static int dsa_slave_netpoll_setup(struct net_device *dev,
 				   struct netpoll_info *ni)
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
-	struct dsa_switch *ds = p->dp->ds;
-	struct net_device *master = ds->dst->master_netdev;
+	struct net_device *master = dsa_master_netdev(p);
 	struct netpoll *netpoll;
 	int err = 0;
 
@@ -1143,9 +1142,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 	struct dsa_slave_priv *p;
 	int ret;
 
-	master = ds->dst->master_netdev;
-	if (ds->master_netdev)
-		master = ds->master_netdev;
+	master = ds->dst->cpu_dp->netdev;
 
 	slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 				 NET_NAME_UNKNOWN, ether_setup);

From 67dbb9d433447e358de7d293f15318bb5db9529b Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 13 Jun 2017 13:27:20 -0700
Subject: [PATCH 2/4] net: dsa: Relocate master ethtool operations

Relocate master_ethtool_ops and master_orig_ethtool_ops into struct
dsa_port in order to be both consistent, and make things self contained
within the dsa_port structure.

This is a preliminary change to supporting multiple CPU port interfaces.

Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/dsa.h | 17 +++++------------
 net/dsa/dsa.c     | 16 ++++++----------
 net/dsa/slave.c   | 16 ++++++++--------
 3 files changed, 19 insertions(+), 30 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index b2fb53f5e28e..7e93869819f9 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -122,24 +122,12 @@ struct dsa_switch_tree {
 	 */
 	struct dsa_platform_data	*pd;
 
-	/*
-	 * Reference to network device to use, and which tagging
-	 * protocol to use.
-	 */
-	struct net_device	*master_netdev;
-
 	/* Copy of tag_ops->rcv for faster access in hot path */
 	struct sk_buff *	(*rcv)(struct sk_buff *skb,
 				       struct net_device *dev,
 				       struct packet_type *pt,
 				       struct net_device *orig_dev);
 
-	/*
-	 * Original copy of the master netdev ethtool_ops
-	 */
-	struct ethtool_ops	master_ethtool_ops;
-	const struct ethtool_ops *master_orig_ethtool_ops;
-
 	/*
 	 * The switch port to which the CPU is attached.
 	 */
@@ -189,6 +177,11 @@ struct dsa_port {
 	u8			stp_state;
 	struct net_device	*bridge_dev;
 	struct devlink_port	devlink_port;
+	/*
+	 * Original copy of the master netdev ethtool_ops
+	 */
+	struct ethtool_ops	ethtool_ops;
+	const struct ethtool_ops *orig_ethtool_ops;
 };
 
 struct dsa_switch {
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 6aacc2314a8f..416ac4ef9ba9 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -118,15 +118,16 @@ int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
 	struct net_device *master;
 	struct ethtool_ops *cpu_ops;
 
-	master = ds->dst->cpu_dp->netdev;
+	master = cpu_dp->netdev;
+
 	cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 	if (!cpu_ops)
 		return -ENOMEM;
 
-	memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
+	memcpy(&cpu_dp->ethtool_ops, master->ethtool_ops,
 	       sizeof(struct ethtool_ops));
-	ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
-	memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
+	cpu_dp->orig_ethtool_ops = master->ethtool_ops;
+	memcpy(cpu_ops, &cpu_dp->ethtool_ops,
 	       sizeof(struct ethtool_ops));
 	dsa_cpu_port_ethtool_init(cpu_ops);
 	master->ethtool_ops = cpu_ops;
@@ -136,12 +137,7 @@ int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
 
 void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
 {
-	struct dsa_switch *ds = cpu_dp->ds;
-	struct net_device *master;
-
-	master = ds->dst->cpu_dp->netdev;
-
-	master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
+	cpu_dp->netdev->ethtool_ops = cpu_dp->orig_ethtool_ops;
 }
 
 void dsa_cpu_dsa_destroy(struct dsa_port *port)
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 658bc67c5320..9bf4c27f3393 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -524,10 +524,10 @@ static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 	s8 cpu_port = dst->cpu_dp->index;
 	int count = 0;
 
-	if (dst->master_ethtool_ops.get_sset_count) {
-		count = dst->master_ethtool_ops.get_sset_count(dev,
+	if (dst->cpu_dp->ethtool_ops.get_sset_count) {
+		count = dst->cpu_dp->ethtool_ops.get_sset_count(dev,
 							       ETH_SS_STATS);
-		dst->master_ethtool_ops.get_ethtool_stats(dev, stats, data);
+		dst->cpu_dp->ethtool_ops.get_ethtool_stats(dev, stats, data);
 	}
 
 	if (ds->ops->get_ethtool_stats)
@@ -540,8 +540,8 @@ static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 	struct dsa_switch *ds = dst->cpu_dp->ds;
 	int count = 0;
 
-	if (dst->master_ethtool_ops.get_sset_count)
-		count += dst->master_ethtool_ops.get_sset_count(dev, sset);
+	if (dst->cpu_dp->ethtool_ops.get_sset_count)
+		count += dst->cpu_dp->ethtool_ops.get_sset_count(dev, sset);
 
 	if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
 		count += ds->ops->get_sset_count(ds);
@@ -565,10 +565,10 @@ static void dsa_cpu_port_get_strings(struct net_device *dev,
 	/* We do not want to be NULL-terminated, since this is a prefix */
 	pfx[sizeof(pfx) - 1] = '_';
 
-	if (dst->master_ethtool_ops.get_sset_count) {
-		mcount = dst->master_ethtool_ops.get_sset_count(dev,
+	if (dst->cpu_dp->ethtool_ops.get_sset_count) {
+		mcount = dst->cpu_dp->ethtool_ops.get_sset_count(dev,
 								ETH_SS_STATS);
-		dst->master_ethtool_ops.get_strings(dev, stringset, data);
+		dst->cpu_dp->ethtool_ops.get_strings(dev, stringset, data);
 	}
 
 	if (stringset == ETH_SS_STATS && ds->ops->get_strings) {

From a29342e739115211615acc33616e547b2d3e0663 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 13 Jun 2017 13:27:21 -0700
Subject: [PATCH 3/4] net: dsa: Associate slave network device with CPU port

In preparation for supporting multiple CPU ports with DSA, have the
dsa_port structure know which CPU it is associated with. This will be
important in order to make sure the correct CPU is used for transmission
of the frames. If not for functional reasons, for performance (e.g: load
balancing) and forwarding decisions.

Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/dsa.h  |  1 +
 net/dsa/dsa2.c     | 11 +++++++++++
 net/dsa/dsa_priv.h |  2 +-
 net/dsa/legacy.c   |  1 +
 net/dsa/slave.c    |  4 +++-
 5 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 7e93869819f9..58969b9a090c 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -171,6 +171,7 @@ struct dsa_port {
 	struct dsa_switch	*ds;
 	unsigned int		index;
 	const char		*name;
+	struct dsa_port		*cpu_dp;
 	struct net_device	*netdev;
 	struct device_node	*dn;
 	unsigned int		ageing_time;
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index ab48c4f989da..52af8401af07 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -490,6 +490,8 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
 	enum dsa_tag_protocol tag_protocol;
 	struct net_device *ethernet_dev;
 	struct device_node *ethernet;
+	struct dsa_port *p;
+	unsigned int i;
 
 	if (port->dn) {
 		ethernet = of_parse_phandle(port->dn, "ethernet", 0);
@@ -507,6 +509,15 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
 	if (!dst->cpu_dp) {
 		dst->cpu_dp = port;
 		dst->cpu_dp->netdev = ethernet_dev;
+
+		for (i = 0; i < ds->num_ports; i++) {
+			p = &ds->ports[i];
+			if (!dsa_port_is_valid(p) ||
+			    i == index)
+				continue;
+
+			p->cpu_dp = port;
+		}
 	}
 
 	tag_protocol = ds->ops->get_tag_protocol(ds);
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 5c510f4ba0ce..7c2326f3b538 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -185,7 +185,7 @@ extern const struct dsa_device_ops trailer_netdev_ops;
 
 static inline struct net_device *dsa_master_netdev(struct dsa_slave_priv *p)
 {
-	return p->dp->ds->dst->cpu_dp->netdev;
+	return p->dp->cpu_dp->netdev;
 }
 
 #endif
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 5d4f6ffa3424..e60906125375 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -129,6 +129,7 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 			ds->dsa_port_mask |= 1 << i;
 		} else {
 			ds->enabled_port_mask |= 1 << i;
+			ds->ports[i].cpu_dp = dst->cpu_dp;
 		}
 		valid_name_found = true;
 	}
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 9bf4c27f3393..a80b46777a04 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1140,9 +1140,11 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 	struct net_device *master;
 	struct net_device *slave_dev;
 	struct dsa_slave_priv *p;
+	struct dsa_port *cpu_dp;
 	int ret;
 
-	master = ds->dst->cpu_dp->netdev;
+	cpu_dp = ds->dst->cpu_dp;
+	master = cpu_dp->netdev;
 
 	slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 				 NET_NAME_UNKNOWN, ether_setup);

From 3cc9f2573cdcbc6991aa2d1c8e04a4b9190487f8 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 13 Jun 2017 13:27:22 -0700
Subject: [PATCH 4/4] net: dsa: Introduce dsa_get_cpu_port()

Introduce a helper function which will return a reference to the CPU
port used in a dsa_switch_tree. Right now this is a singleton, but this
will change once we introduce multi-CPU port support, so ease the
transition by converting the affected code paths.

Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/dsa/dsa_priv.h    |  5 +++++
 net/dsa/slave.c       | 31 ++++++++++++++++---------------
 net/dsa/tag_brcm.c    |  5 ++---
 net/dsa/tag_ksz.c     |  5 ++---
 net/dsa/tag_qca.c     |  3 ++-
 net/dsa/tag_trailer.c |  5 ++---
 6 files changed, 29 insertions(+), 25 deletions(-)

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 7c2326f3b538..55982cc39b24 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -188,4 +188,9 @@ static inline struct net_device *dsa_master_netdev(struct dsa_slave_priv *p)
 	return p->dp->cpu_dp->netdev;
 }
 
+static inline struct dsa_port *dsa_get_cpu_port(struct dsa_switch_tree *dst)
+{
+	return dst->cpu_dp;
+}
+
 #endif
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index a80b46777a04..9507bd38cf04 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -520,14 +520,14 @@ static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 					   uint64_t *data)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds = dst->cpu_dp->ds;
-	s8 cpu_port = dst->cpu_dp->index;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
+	struct dsa_switch *ds = cpu_dp->ds;
+	s8 cpu_port = cpu_dp->index;
 	int count = 0;
 
-	if (dst->cpu_dp->ethtool_ops.get_sset_count) {
-		count = dst->cpu_dp->ethtool_ops.get_sset_count(dev,
-							       ETH_SS_STATS);
-		dst->cpu_dp->ethtool_ops.get_ethtool_stats(dev, stats, data);
+	if (cpu_dp->ethtool_ops.get_sset_count) {
+		count = cpu_dp->ethtool_ops.get_sset_count(dev, ETH_SS_STATS);
+		cpu_dp->ethtool_ops.get_ethtool_stats(dev, stats, data);
 	}
 
 	if (ds->ops->get_ethtool_stats)
@@ -537,11 +537,12 @@ static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds = dst->cpu_dp->ds;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
+	struct dsa_switch *ds = cpu_dp->ds;
 	int count = 0;
 
-	if (dst->cpu_dp->ethtool_ops.get_sset_count)
-		count += dst->cpu_dp->ethtool_ops.get_sset_count(dev, sset);
+	if (cpu_dp->ethtool_ops.get_sset_count)
+		count += cpu_dp->ethtool_ops.get_sset_count(dev, sset);
 
 	if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
 		count += ds->ops->get_sset_count(ds);
@@ -553,8 +554,9 @@ static void dsa_cpu_port_get_strings(struct net_device *dev,
 				     uint32_t stringset, uint8_t *data)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds = dst->cpu_dp->ds;
-	s8 cpu_port = dst->cpu_dp->index;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
+	struct dsa_switch *ds = cpu_dp->ds;
+	s8 cpu_port = cpu_dp->index;
 	int len = ETH_GSTRING_LEN;
 	int mcount = 0, count;
 	unsigned int i;
@@ -565,10 +567,9 @@ static void dsa_cpu_port_get_strings(struct net_device *dev,
 	/* We do not want to be NULL-terminated, since this is a prefix */
 	pfx[sizeof(pfx) - 1] = '_';
 
-	if (dst->cpu_dp->ethtool_ops.get_sset_count) {
-		mcount = dst->cpu_dp->ethtool_ops.get_sset_count(dev,
-								ETH_SS_STATS);
-		dst->cpu_dp->ethtool_ops.get_strings(dev, stringset, data);
+	if (cpu_dp->ethtool_ops.get_sset_count) {
+		mcount = cpu_dp->ethtool_ops.get_sset_count(dev, ETH_SS_STATS);
+		cpu_dp->ethtool_ops.get_strings(dev, stringset, data);
 	}
 
 	if (stringset == ETH_SS_STATS && ds->ops->get_strings) {
diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index c03860907f28..c697d9815177 100644
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -93,12 +93,11 @@ static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 				    struct net_device *orig_dev)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
+	struct dsa_switch *ds = cpu_dp->ds;
 	int source_port;
 	u8 *brcm_tag;
 
-	ds = dst->cpu_dp->ds;
-
 	if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN)))
 		return NULL;
 
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index b94a334a1d02..fab41de8e983 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -75,12 +75,11 @@ static struct sk_buff *ksz_rcv(struct sk_buff *skb, struct net_device *dev,
 			       struct net_device *orig_dev)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
+	struct dsa_switch *ds = cpu_dp->ds;
 	u8 *tag;
 	int source_port;
 
-	ds = dst->cpu_dp->ds;
-
 	tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
 
 	source_port = tag[0] & 7;
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index 4f43cf0b4eff..1867a3d11f28 100644
--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -67,6 +67,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 				   struct net_device *orig_dev)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
 	struct dsa_switch *ds;
 	u8 ver;
 	int port;
@@ -95,7 +96,7 @@ static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
 	/* This protocol doesn't support cascading multiple switches so it's
 	 * safe to assume the switch is first in the tree
 	 */
-	ds = dst->cpu_dp->ds;
+	ds = cpu_dp->ds;
 	if (!ds)
 		return NULL;
 
diff --git a/net/dsa/tag_trailer.c b/net/dsa/tag_trailer.c
index b4f6db094409..172f13167896 100644
--- a/net/dsa/tag_trailer.c
+++ b/net/dsa/tag_trailer.c
@@ -61,12 +61,11 @@ static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 				   struct net_device *orig_dev)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
-	struct dsa_switch *ds;
+	struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
+	struct dsa_switch *ds = cpu_dp->ds;
 	u8 *trailer;
 	int source_port;
 
-	ds = dst->cpu_dp->ds;
-
 	if (skb_linearize(skb))
 		return NULL;