netdev - [PATCH net-next 01/10] net: etherdevice: add address inherit helper

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Message-Id: <1377250513-3662-2-git-send-email-bjorn@mork.no>
Date:	Fri, 23 Aug 2013 11:35:04 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	netdev@...r.kernel.org
Cc:	Bjørn Mork <bjorn@...k.no>
Subject: [PATCH net-next 01/10] net: etherdevice: add address inherit helper

Some etherdevices inherit their address from a parent or
master device. The addr_assign_type should be updated along
with the address in these cases.  Adding a helper function
to simplify this.

Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
 include/linux/etherdevice.h |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index c623861..49b6695 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -199,6 +199,25 @@ static inline void eth_hw_addr_random(struct net_device *dev)
 }
 
 /**
+ * eth_hw_addr_inherit - Copy dev_addr from another net_device
+ * @dst: pointer to net_device to copy dev_addr to
+ * @src: pointer to net_device to copy dev_addr from
+ *
+ * Copy the Ethernet address from one net_device to another along with
+ * the addr_assign_type.
+ */
+static inline int eth_hw_addr_inherit(struct net_device *dst,
+				      struct net_device *src)
+{
+	if (dst->addr_len != src->addr_len)
+		return -EINVAL;
+
+	dst->addr_assign_type = src->addr_assign_type;
+	memcpy(dst->dev_addr, src->dev_addr, dst->addr_len);
+	return 0;
+}
+
+/**
  * compare_ether_addr - Compare two Ethernet addresses
  * @addr1: Pointer to a six-byte array containing the Ethernet address
  * @addr2: Pointer other six-byte array containing the Ethernet address
-- 
1.7.10.4

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