From: Michael Walle <michael@walle.cc>
To: netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Rob Herring <robh+dt@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
Frank Rowand <frowand.list@gmail.com>,
Michael Walle <michael@walle.cc>
Subject: [PATCH net-next 2/3] net: add helper eth_addr_add()
Date: Wed, 14 Apr 2021 17:26:56 +0200 [thread overview]
Message-ID: <20210414152657.12097-3-michael@walle.cc> (raw)
In-Reply-To: <20210414152657.12097-1-michael@walle.cc>
Sometimes you need to add an offset to a base ethernet address. Add a
helper for that.
Signed-off-by: Michael Walle <michael@walle.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
next prev parent reply other threads:[~2021-04-14 15:27 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 15:26 [PATCH net-next 0/3] net: add support for an offset of a nvmem provided MAC address Michael Walle
2021-04-14 15:26 ` [PATCH net-next 1/3] dt-bindings: net: add nvmem-mac-address-offset property Michael Walle
2021-04-14 15:43 ` Andrew Lunn
2021-04-15 21:59 ` Rob Herring
2021-04-15 22:27 ` Michael Walle
2021-05-12 15:27 ` Michael Walle
2021-04-15 23:45 ` Florian Fainelli
2021-04-14 15:26 ` Michael Walle [this message]
2021-04-14 15:26 ` [PATCH net-next 3/3] net: implement nvmem-mac-address-offset DT property Michael Walle
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