linux-kernel - [PATCH net-next 2/3] net: add helper eth_addr

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Message-Id: <20210414152657.12097-3-michael@walle.cc>
Date:   Wed, 14 Apr 2021 17:26:56 +0200
From:   Michael Walle <michael@...le.cc>
To:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Frank Rowand <frowand.list@...il.com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next 2/3] net: add helper eth_addr_add()

Sometimes you need to add an offset to a base ethernet address. Add a
helper for that.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 include/linux/etherdevice.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 330345b1be54..6ec62c501d3f 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -466,6 +466,20 @@ static inline void eth_addr_inc(u8 *addr)
 	u64_to_ether_addr(u, addr);
 }
 
+/**
+ * eth_addr_add() - Add (or subtract) and offset to/from the given MAC address.
+ *
+ * @offset: Offset to add.
+ * @addr: Pointer to a six-byte array containing Ethernet address to increment.
+ */
+static inline void eth_addr_add(u8 *addr, long offset)
+{
+	u64 u = ether_addr_to_u64(addr);
+
+	u += offset;
+	u64_to_ether_addr(u, addr);
+}
+
 /**
  * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
  * @dev: Pointer to a device structure
-- 
2.20.1