From patchwork Wed Nov 23 18:01:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 13054075 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 55238C4332F for ; Wed, 23 Nov 2022 18:03:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=0IcAkUPjZIGYp4KioyaE4/IfQTSnYhBKBMBixHHD+KE=; b=XVkwmVJzMpOcGY 3BKmBwFS6VP7YdT3bABl1PJgDyA6JtEqLxz4DaIGJhZ6zf/02FGLUDZ2i5CctAIsrD5i1kaObfrHF 1DVFOCrWCgp170JQqjJm0k+k6ssE3vuAKag80r6WFg6c/f2t6I/NHlk5hq5WW8iAwonp67i6scyz5 GRyixGJK8AByHdoSlX4BgyAzzngTrXVhuOEzvskVLZbjMycd7mMnlJGBtE5m7Gq5wVdoCCP+3b/a8 Ow8ESzdxosfR1q77GtuuWb97kSUMZxsGlpZHWBsAgnt2bkElzr2S56baYt1xzlVuuJTAUMWivacc3 mSRlquhV0meI79i+1odA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oxu5E-001OQt-PE; Wed, 23 Nov 2022 18:02:52 +0000 Received: from 0001.3ffe.de ([2a01:4f8:c0c:9d57::1] helo=mail.3ffe.de) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oxu4k-001OFC-VD for linux-arm-kernel@lists.infradead.org; Wed, 23 Nov 2022 18:02:25 +0000 Received: from mwalle01.kontron.local. (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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221123_100223_205134_B5270CE1 X-CRM114-Status: GOOD ( 11.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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