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=ham 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 40A52C433DF for ; Mon, 29 Jun 2020 21:40:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FCF9206A1 for ; Mon, 29 Jun 2020 21:40:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593466803; bh=PPeWyYS4FCFQJSFCRFag4CcXyIoAO/wk/iRh2ObDfuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=czbiuvPy188YsULJxK6jzSZvfvg/79m81KRRgRkqVw7U4xwo9091nf2kpfzZRh1Mf /vTPzDw/un+uFDnqvM2xYf7cYHbKycZHsdmoN1i7THoS9y8zcdUomOFvtxdeYbjoXx 2VkzZi01ZjGSO+yMrBKY4nr7gJyPhQI52W83UEcs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388475AbgF2VkB (ORCPT ); Mon, 29 Jun 2020 17:40:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:60646 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728307AbgF2Sk3 (ORCPT ); Mon, 29 Jun 2020 14:40:29 -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 CA8E923EF2; Mon, 29 Jun 2020 15:18:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593443906; bh=PPeWyYS4FCFQJSFCRFag4CcXyIoAO/wk/iRh2ObDfuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CtHRuCCP3jaIG/tWjp4XvAH9i7bhSO2/CtnEBcXYshvbrK26DiNdva4YOpbU8c98k mSloObqj4X0A8I+M6PA/KH304lnHTs0EdX9vMxslDr/t7xmZiRUtEqww3kzImhKilV XdvlBRfa0n05nLI2FapFEaCXqgXC35fBHFQ1kuuE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Falcon , "David S . Miller" , Greg Kroah-Hartman Subject: [PATCH 5.7 006/265] ibmveth: Fix max MTU limit Date: Mon, 29 Jun 2020 11:13:59 -0400 Message-Id: <20200629151818.2493727-7-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200629151818.2493727-1-sashal@kernel.org> References: <20200629151818.2493727-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.7.7-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.7.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.7.7-rc1 X-KernelTest-Deadline: 2020-07-01T15:14+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 96d36ae5049e1..c5c732601e35e 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -1715,7 +1715,7 @@ 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