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Date:   Fri, 22 May 2020 00:10:25 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        davem@...emloft.net
Cc:     jiri@...nulli.us, idosch@...sch.org, kuba@...nel.org,
        ivecera@...hat.com, netdev@...r.kernel.org,
        horatiu.vultur@...rochip.com, allan.nielsen@...rochip.com,
        nikolay@...ulusnetworks.com, roopa@...ulusnetworks.com
Subject: [PATCH RFC net-next 02/13] net: 8021q: vlan_dev: add vid tag to addresses of uc and mc lists

From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

Update vlan mc and uc addresses with VID tag while propagating
addresses to lower devices, do this only if address is not synced.
It allows at end driver level to distinguish addresses belonging
to vlan devices.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 include/linux/if_vlan.h |  1 +
 net/8021q/vlan.h        |  2 ++
 net/8021q/vlan_core.c   | 13 +++++++++++++
 net/8021q/vlan_dev.c    | 26 ++++++++++++++++++++++++++
 4 files changed, 42 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index b05e855f1ddd..20407f73cfee 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -131,6 +131,7 @@ extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
 extern int vlan_for_each(struct net_device *dev,
 			 int (*action)(struct net_device *dev, int vid,
 				       void *arg), void *arg);
+extern u16 vlan_dev_get_addr_vid(struct net_device *dev, const u8 *addr);
 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
 extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index bb7ec1a3915d..e7f43d7fcc9a 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -6,6 +6,8 @@
 #include <linux/u64_stats_sync.h>
 #include <linux/list.h>
 
+#define NET_8021Q_VID_TSIZE	2
+
 /* if this changes, algorithm will have to be reworked because this
  * depends on completely exhausting the VLAN identifier space.  Thus
  * it gives constant time look-up, but in many cases it wastes memory.
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 78ec2e1b14d1..b528f09be9a3 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -453,6 +453,19 @@ bool vlan_uses_dev(const struct net_device *dev)
 }
 EXPORT_SYMBOL(vlan_uses_dev);
 
+u16 vlan_dev_get_addr_vid(struct net_device *dev, const u8 *addr)
+{
+	u16 vid = 0;
+
+	if (dev->vid_len != NET_8021Q_VID_TSIZE)
+		return vid;
+
+	vid = addr[dev->addr_len];
+	vid |= (addr[dev->addr_len + 1] & 0xf) << 8;
+	return vid;
+}
+EXPORT_SYMBOL(vlan_dev_get_addr_vid);
+
 static struct sk_buff *vlan_gro_receive(struct list_head *head,
 					struct sk_buff *skb)
 {
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index f00bb57f0f60..c2c3e5ae535c 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -244,6 +244,14 @@ void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 	strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 }
 
+static void vlan_dev_set_addr_vid(struct net_device *vlan_dev, u8 *addr)
+{
+	u16 vid = vlan_dev_vlan_id(vlan_dev);
+
+	addr[vlan_dev->addr_len] = vid & 0xff;
+	addr[vlan_dev->addr_len + 1] = (vid >> 8) & 0xf;
+}
+
 bool vlan_dev_inherit_address(struct net_device *dev,
 			      struct net_device *real_dev)
 {
@@ -482,8 +490,26 @@ static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 	}
 }
 
+static void vlan_dev_align_addr_vid(struct net_device *vlan_dev)
+{
+	struct net_device *real_dev = vlan_dev_real_dev(vlan_dev);
+	struct netdev_hw_addr *ha;
+
+	if (!real_dev->vid_len)
+		return;
+
+	netdev_for_each_mc_addr(ha, vlan_dev)
+		if (!ha->sync_cnt)
+			vlan_dev_set_addr_vid(vlan_dev, ha->addr);
+
+	netdev_for_each_uc_addr(ha, vlan_dev)
+		if (!ha->sync_cnt)
+			vlan_dev_set_addr_vid(vlan_dev, ha->addr);
+}
+
 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 {
+	vlan_dev_align_addr_vid(vlan_dev);
 	dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 	dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 }
-- 
2.25.1

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