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(unknown [213.135.10.150]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.3ffe.de (Postfix) with ESMTPSA id 59D7C27B2; Wed, 23 Nov 2022 19:02:18 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1669226538; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8sjjk67lYXsbZ+8cTcOR9HPiqjFzaTQLO5gq3X9c4IA=; b=zeAXKIkh1NfD6yON6Wk9huqk9GL/RNNI0wcW3b+xZN/jZNrEJoLcYjTEq9j4Ei5Q8OHFU8 H/a+SvAyy9EIJtraA9MccxRXjPdez1bvmYjbK0qoUTnfBjtC+nTKjVg26J022Nzn7lLD3o t1ZSX8SOaqfRgO6+D+DZB8XHvNSMGp3Vc/QdG4DP8kwEHHvLh8yElLsp8DN82kS7XmzLW3 Nfe2yxX2UAR7Z+7vV8GfV6dv24MeKJr/CyEeg0lLrF4HQJ9xhreMlvdcOpTt9r0olAMoMM J7C5evjwohYhc8R7fAUtXjczWJNuOzCB5YJAQ7eyIKZ87Tl9o2QpK/Rz+V3c9w== From: Michael Walle To: Jonathan Corbet , Srinivas Kandagatla , Miquel Raynal , Rob Herring , Frank Rowand , Sascha Hauer Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Michael Walle , Andrew Lunn , Jakub Kicinski Subject: [PATCH v4 01/20] net: add helper eth_addr_add() Date: Wed, 23 Nov 2022 19:01:32 +0100 Message-Id: <20221123180151.2160033-2-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221123180151.2160033-1-michael@walle.cc> References: <20221123180151.2160033-1-michael@walle.cc> MIME-Version: 1.0 X-Spam: Yes X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1750311033060736712?= X-GMAIL-MSGID: =?utf-8?q?1750311033060736712?= Add a helper to add an offset to a ethernet address. This comes in handy if you have a base ethernet address for multiple interfaces. Signed-off-by: Michael Walle Reviewed-by: Andrew Lunn Acked-by: Jakub Kicinski --- changes since v3: - fix typo s/and/an/ changes since v2: - none changes since v1: - none include/linux/etherdevice.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index a541f0c4f146..224645f17c33 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -507,6 +507,20 @@ static inline void eth_addr_inc(u8 *addr) u64_to_ether_addr(u, addr); } +/** + * eth_addr_add() - Add (or subtract) an 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