netdev - [PATCH v2 net-next 1/9] net: etherdevice: add address inherit helper

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Date:	Fri, 30 Aug 2013 18:08:44 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	netdev@...r.kernel.org
Cc:	Bjørn Mork <bjorn@...k.no>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jiri Pirko <jiri@...nulli.us>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, Jouni Malinen <j@...fi>,
	libertas-dev@...ts.infradead.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Forest Bond <forest@...ttletooquiet.net>
Subject: [PATCH v2 net-next 1/9] 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 |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index c623861..d8b5124 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -199,6 +199,21 @@ 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 address attributes (addr_assign_type).
+ */
+static inline void eth_hw_addr_inherit(struct net_device *dst,
+				       struct net_device *src)
+{
+	dst->addr_assign_type = src->addr_assign_type;
+	memcpy(dst->dev_addr, src->dev_addr, ETH_ALEN);
+}
+
+/**
  * 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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