From patchwork Tue Dec 28 14:25:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 12700404 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 517A8C433EF for ; Tue, 28 Dec 2021 14:38:05 +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=sEXaNeYCt14yKF8GemSonm2mDYxQ0rXnfJFkOB0YjVQ=; b=bVRDuNtgqqFZZ1 na2mOkU3HjbeG6KKwbp3Z/QylfjP/1PcxRi0WJD5L/mrh22mRqNqAxRyZiH3NLHayaj4p4NDiD4mH bxlEniZEqzpgiKriOv29Lah0JiOFHv+foN5QUgOvo/bJVTRqiR3x19YganYvd1SKYcsxLBpoMrRZL lOFXGbx1dSpCtWs4mSQCMJQSV6lyAKXIzvM6vQ2bm5Nkxr4lLsX5HnwSD8c03s9IG8RBxpDmBTHQd gkLN6FFDHwXrM30RFi6RcmfzykrF28tRoo2W9PyDr7qWbpXLYSXX4XpGnzSvm5CauibGa4O/5iTGv kCQQXd0AXYmWWqJCONOg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n2Daj-001ASz-Om; Tue, 28 Dec 2021 14:36:42 +0000 Received: from ssl.serverraum.org ([2a01:4f8:151:8464::1:2]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1n2DQn-00170K-G7; Tue, 28 Dec 2021 14:26:28 +0000 Received: from mwalle01.kontron.local. (unknown [IPv6:2a02:810b:4340:43bf:fa59:71ff:fe9b:b851]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id 4FBF3223F6; Tue, 28 Dec 2021 15:26:17 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1640701577; 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=DvU9qr8AVDqwLiuTpAxXwhFvaaqgNiy89x8GquK/9Ww=; b=FrhGUJb9CsrE8BDVdbOUK1k1a21Gt2cjj+pkWleFEwpBSX5l+i5yX+WjELwD2uOPEMlL+z hWFPxMUeDxcnTe5ax+kaqTtpKZaMip88/BZdlMwmIqRk8Zz6VUXBAX/vbWQs6v7EAgcn4s i5vOOtgxg9roeJO3TufPptsun+fo3YI= From: Michael Walle To: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Srinivas Kandagatla , Shawn Guo , Li Yang , Frank Rowand , "David S . Miller" , Jakub Kicinski , Ansuel Smith , Andrew Lunn , Michael Walle Subject: [PATCH 5/8] net: add helper eth_addr_add() Date: Tue, 28 Dec 2021 15:25:46 +0100 Message-Id: <20211228142549.1275412-6-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211228142549.1275412-1-michael@walle.cc> References: <20211228142549.1275412-1-michael@walle.cc> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211228_062625_755508_BFE9C23A X-CRM114-Status: GOOD ( 10.23 ) 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 --- include/linux/etherdevice.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 2ad71cc90b37..9d621dc85290 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -486,6 +486,20 @@ 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