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From:   Tao Ren <taoren@fb.com>
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To:     "David S . Miller" <davem@davemloft.net>,
        Maxim Mikityanskiy <maximmi@mellanox.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Jakub Kicinski <jakub.kicinski@netronome.com>,
        Samuel Mendoza-Jonas <sam@mendozajonas.com>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>, <openbmc@lists.ozlabs.org>
CC:     Tao Ren <taoren@fb.com>
Smtp-Origin-Cluster: prn1c35
Subject: [PATCH net 1/2] net: add eth_addr_inc in etherdevice.h
Date:   Tue, 23 Apr 2019 14:20:37 -0700
Message-ID: <20190423212037.1983760-1-taoren@fb.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add eth_addr_inc function in etherdevice.h to increment MAC address. One
of the use cases is in ncsi stack, where the host's MAC address needs to
be incremented to get BMC's MAC address.

Signed-off-by: Tao Ren <taoren@fb.com>
---
 include/linux/etherdevice.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index e2f3b21cd72a..d48e3a724c54 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -448,6 +448,19 @@ static inline void eth_addr_dec(u8 *addr)
 	u64_to_ether_addr(u, addr);
 }
 
+/**
+ * eth_addr_inc - Increment the given MAC address
+ *
+ * @addr: Pointer to a six-byte array containing Ethernet address to increment
+ */
+static inline void eth_addr_inc(u8 *addr)
+{
+	u64 u = ether_addr_to_u64(addr);
+
+	u++;
+	u64_to_ether_addr(u, addr);
+}
+
 /**
  * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
  * @dev: Pointer to a device structure
-- 
2.17.1