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 76C32C433E0 for ; Mon, 29 Jun 2020 20:13:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4FD8420675 for ; Mon, 29 Jun 2020 20:13:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593461625; bh=JdgE9rMJ+iZmziEXrJzS6vBXa57ZLQ+E+OmJdSTAQN0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0N1byF8l/TEkWWjbbVgj9+jhKlrB+VMp2nJFn+eTTV70NjwC+n38WWGgLehIRhJbN D1bAyfMUXPaiqDDs38LBkjNgGcwJYdwdC5Da9K6ETeT9uMHiwB8Y/KnxRY/lOz+QkM lmiiTpzUmA1dtHHn8EyeaZqMzf9HJyBq7iZnI8Ik= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731998AbgF2UNo (ORCPT ); Mon, 29 Jun 2020 16:13:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:40572 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732852AbgF2TaT (ORCPT ); Mon, 29 Jun 2020 15:30:19 -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 2375F25204; Mon, 29 Jun 2020 15:35:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593444920; bh=JdgE9rMJ+iZmziEXrJzS6vBXa57ZLQ+E+OmJdSTAQN0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n93e4sOXGFObuuFWr/WBvrboeAD7Jg4dkqtVQmm8ZZ2Eux5fuIxRpEM9GQ20H8Ttv C/xCdYzMpcqRpNZ9ltXyEYoJXawII8ffMUo2mZcKzZvTwwYhbFI7VC011hGgTSGG/e fTTQD7IA6Ah838CM2ndmvRhXGyO6glmLzorV8gDw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Falcon , "David S . Miller" , Greg Kroah-Hartman Subject: [PATCH 4.19 017/131] ibmveth: Fix max MTU limit Date: Mon, 29 Jun 2020 11:33:08 -0400 Message-Id: <20200629153502.2494656-18-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200629153502.2494656-1-sashal@kernel.org> References: <20200629153502.2494656-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.19.131-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-4.19.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 4.19.131-rc1 X-KernelTest-Deadline: 2020-07-01T15:34+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 40ad1e5032553..e2f6670d6eaf0 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