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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 73AB0C4332D for ; Thu, 19 Mar 2020 13:19:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 433ED21775 for ; Thu, 19 Mar 2020 13:19:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584623978; bh=/VHiwYhTonWyzLvoyPXGrqlp3I7pgiszzsQVERAKcvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lSiqn1eQM03jrXqsRAv0kyEOPI106slD6Qke00CGBW8ADnH96RANN78HJBXfNtoC+ VyFMfl6cvJbiuxwrtY0oJSn88Is/Kp6e1a3+5bhoC4YKs0hrsE/bCXoAGHJAjiO6bm DpMlkiquMRd9lU4uRju6tyBiXiBd2I9C9Hou3XqU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729901AbgCSNTf (ORCPT ); Thu, 19 Mar 2020 09:19:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:42784 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729893AbgCSNTb (ORCPT ); Thu, 19 Mar 2020 09:19:31 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AE1B62166E; Thu, 19 Mar 2020 13:19:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584623970; bh=/VHiwYhTonWyzLvoyPXGrqlp3I7pgiszzsQVERAKcvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nzNWzyUj8rqIKGifC7E3gzavXeTGS/UByjOOabHsDrXln8L2jS3obXaT1UuHsM7R+ ICEmI01L11YupSqSZM1HUDqL/cEs97wOY/9Zzsqut7WeIOBROM6ARVMqn+NmORUBxR t+eFXmZ03hh5VRuNorN3arBza5JynBRhgkO9OyBI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniele Palmas , =?UTF-8?q?Bj=C3=B8rn=20Mork?= , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 15/48] net: usb: qmi_wwan: restore mtu min/max values after raw_ip switch Date: Thu, 19 Mar 2020 14:03:57 +0100 Message-Id: <20200319123907.876403428@linuxfoundation.org> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200319123902.941451241@linuxfoundation.org> References: <20200319123902.941451241@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Daniele Palmas [ Upstream commit eae7172f8141eb98e64e6e81acc9e9d5b2add127 ] usbnet creates network interfaces with min_mtu = 0 and max_mtu = ETH_MAX_MTU. These values are not modified by qmi_wwan when the network interface is created initially, allowing, for example, to set mtu greater than 1500. When a raw_ip switch is done (raw_ip set to 'Y', then set to 'N') the mtu values for the network interface are set through ether_setup, with min_mtu = ETH_MIN_MTU and max_mtu = ETH_DATA_LEN, not allowing anymore to set mtu greater than 1500 (error: mtu greater than device maximum). The patch restores the original min/max mtu values set by usbnet after a raw_ip switch. Signed-off-by: Daniele Palmas Acked-by: Bjørn Mork Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/usb/qmi_wwan.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index a04f8577d9f21..1d60ccd48ec29 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -274,6 +274,9 @@ static void qmi_wwan_netdev_setup(struct net_device *net) netdev_dbg(net, "mode: raw IP\n"); } else if (!net->header_ops) { /* don't bother if already set */ ether_setup(net); + /* Restoring min/max mtu values set originally by usbnet */ + net->min_mtu = 0; + net->max_mtu = ETH_MAX_MTU; clear_bit(EVENT_NO_IP_ALIGN, &dev->flags); netdev_dbg(net, "mode: Ethernet\n"); } -- 2.20.1