42 lines
1.4 KiB
Diff
42 lines
1.4 KiB
Diff
From 7390609b0121a1b982c5ecdfcd72dc328e5784ee Mon Sep 17 00:00:00 2001
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From: Michael Walle <michael@walle.cc>
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Date: Mon, 6 Feb 2023 13:43:42 +0000
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Subject: [PATCH] net: add helper eth_addr_add()
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Add a helper to add an offset to a ethernet address. This comes in handy
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if you have a base ethernet address for multiple interfaces.
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Signed-off-by: Michael Walle <michael@walle.cc>
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Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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Acked-by: Jakub Kicinski <kuba@kernel.org>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20230206134356.839737-9-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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include/linux/etherdevice.h | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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--- a/include/linux/etherdevice.h
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+++ b/include/linux/etherdevice.h
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@@ -508,6 +508,20 @@ static inline void eth_addr_inc(u8 *addr
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}
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/**
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+ * eth_addr_add() - Add (or subtract) an offset to/from the given MAC address.
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+ *
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+ * @offset: Offset to add.
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+ * @addr: Pointer to a six-byte array containing Ethernet address to increment.
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+ */
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+static inline void eth_addr_add(u8 *addr, long offset)
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+{
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+ u64 u = ether_addr_to_u64(addr);
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+
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+ u += offset;
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+ u64_to_ether_addr(u, addr);
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+}
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+
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+/**
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* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
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* @dev: Pointer to a device structure
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* @addr: Pointer to a six-byte array containing the Ethernet address
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