From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3DF76C433DF for ; Mon, 29 Jun 2020 20:15:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 150F920675 for ; Mon, 29 Jun 2020 20:15:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593461707; bh=kmHzHmpGDabjP2zgulLoIEpfg8J3c8bV+/my2rP3Zec=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pGcfUvZSkSUXpZFo1C3LH7RF0vCA2SYVC/VJUe3064Bmvq/4LoLT8xkwoXJUfpMsp 8cE1uVpxnZtwFBedyrcc9LiFAorML+a/7vDE9ap/EfZ243yPLVyL5Nsga5UEm/EzL/ ZN1WfYLhRsgUtz1C4IswJL1ALYQB+UEoHijTZeNY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730216AbgF2UPG (ORCPT ); Mon, 29 Jun 2020 16:15:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:40554 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732839AbgF2TaS (ORCPT ); Mon, 29 Jun 2020 15:30:18 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CF031252D2; Mon, 29 Jun 2020 15:38:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593445097; bh=kmHzHmpGDabjP2zgulLoIEpfg8J3c8bV+/my2rP3Zec=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V5DSW90xPhaGxrsqJ60BeKP04t8L4NA4669Fff3qw5o9FduQyKd9Iyp7nKzPitEk5 1Il9yaPelXUlPpQ5NkM0yGFWzCqqei1WnjJK1iucuFAbzPX7pFPchGezKUsaSELkhi X86A5XVxwNm2IdIkDFRvvqbnnsQ51Ky69KjqGMwU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Falcon , "David S . Miller" , Greg Kroah-Hartman Subject: [PATCH 4.14 07/78] ibmveth: Fix max MTU limit Date: Mon, 29 Jun 2020 11:36:55 -0400 Message-Id: <20200629153806.2494953-8-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200629153806.2494953-1-sashal@kernel.org> References: <20200629153806.2494953-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.14.186-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-4.14.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 4.14.186-rc1 X-KernelTest-Deadline: 2020-07-01T15:38+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Falcon [ Upstream commit 5948378b26d89f8aa5eac37629dbd0616ce8d7a7 ] The max MTU limit defined for ibmveth is not accounting for virtual ethernet buffer overhead, which is twenty-two additional bytes set aside for the ethernet header and eight additional bytes of an opaque handle reserved for use by the hypervisor. Update the max MTU to reflect this overhead. Fixes: d894be57ca92 ("ethernet: use net core MTU range checking in more drivers") Fixes: 110447f8269a ("ethernet: fix min/max MTU typos") Signed-off-by: Thomas Falcon Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/ibm/ibmveth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c index 880d925438c17..b43aebfc7f5be 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -1695,7 +1695,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id) } netdev->min_mtu = IBMVETH_MIN_MTU; - netdev->max_mtu = ETH_MAX_MTU; + netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH; memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN); -- 2.25.1