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 73997C433E0 for ; Mon, 29 Jun 2020 19:44:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B1122082F for ; Mon, 29 Jun 2020 19:44:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593459891; bh=6b5KKbzCD16/UYiEDLH2M5EnoWk7Y4bdxlpxfeS917U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=t4PbPbLUdUvd9pxFpWXhsOi+b3G1r/28rnnhw+A7O2zZ8l/D2GoUVvv68LKVQMxyC X2wuDnogdoar8MhbEJk2UALm8XqnVPk6kV//9FpczJY8Lg58WgYJ3BlDa6AEOtN+0l ISGKxmF/szBIQSjqOGzXD2yM/b6H7HdVgVjmRj4A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732054AbgF2Tot (ORCPT ); Mon, 29 Jun 2020 15:44:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:47654 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387833AbgF2Tkp (ORCPT ); Mon, 29 Jun 2020 15:40:45 -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 4FC5724805; Mon, 29 Jun 2020 15:25:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593444329; bh=6b5KKbzCD16/UYiEDLH2M5EnoWk7Y4bdxlpxfeS917U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FI+kDIn800Lo+fhUkUJ8g218lKpXryGXMZ6wHN8N4LvF9Sw5su0kZJxdTiFUOcM1F zvPSY0y9XAocZMOvHZ10rixe/W/SpDmNqqO9HFlqOx8v704KnQTJkLugaKKo7zZwls a5vVVZTH6ySarY+85E4IX5teQKHyXgb+m7XjP6Vc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Falcon , "David S . Miller" , Greg Kroah-Hartman Subject: [PATCH 5.4 004/178] ibmveth: Fix max MTU limit Date: Mon, 29 Jun 2020 11:22:29 -0400 Message-Id: <20200629152523.2494198-5-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200629152523.2494198-1-sashal@kernel.org> References: <20200629152523.2494198-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.4.50-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.4.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.4.50-rc1 X-KernelTest-Deadline: 2020-07-01T15:25+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 c5be4ebd84373..aa32a5b041129 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -1682,7 +1682,7 @@ 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