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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=no 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 AF196C04EBF for ; Mon, 23 Sep 2019 11:42:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8D2FD20820 for ; Mon, 23 Sep 2019 11:42:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732229AbfIWLms (ORCPT ); Mon, 23 Sep 2019 07:42:48 -0400 Received: from simcoe207srvr.owm.bell.net ([184.150.200.207]:39383 "EHLO torfep01.bell.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726146AbfIWLms (ORCPT ); Mon, 23 Sep 2019 07:42:48 -0400 Received: from bell.net torfep01 184.150.200.158 by torfep01.bell.net with ESMTP id <20190923114246.EHLK4584.torfep01.bell.net@torspm01.bell.net> for ; Mon, 23 Sep 2019 07:42:46 -0400 Received: from [192.168.2.49] (really [70.53.53.104]) by torspm01.bell.net with ESMTP id <20190923114246.WNDR39285.torspm01.bell.net@[192.168.2.49]>; Mon, 23 Sep 2019 07:42:46 -0400 Subject: Re: C8000, which is the max MTU of the built-in net card? To: Carlo Pisani , linux-parisc@vger.kernel.org References: <20190917212844.GJ9591@lunn.ch> From: John David Anglin Openpgp: preference=signencrypt Message-ID: <905e567a-3e82-969e-8062-5dd4c712929a@bell.net> Date: Mon, 23 Sep 2019 07:42:45 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-CM-Analysis: v=2.3 cv=S9inP7kP c=1 sm=1 tr=0 cx=a_idp_d a=htCe9XT+XAlGhzqgweArVg==:117 a=htCe9XT+XAlGhzqgweArVg==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=IkcTkHD0fZMA:10 a=J70Eh1EUuV4A:10 a=FBHGMhGWAAAA:8 a=UOMpvLWk_2my8sRCpQgA:9 a=QEXdDO2ut3YA:10 a=9gvnlMMaQFpL9xblJ6ne:22 X-CM-Envelope: MS4wfJSUpwpyUpGNWQduSDLpNb6287IiyEtZaye+G2h8sKRJI45pbGqUJAkSZ943hBRcipH2daknZ67dDP7rCU193vWlY2QAWyiVUS6LECJpsU6TQZhoIzxH FSfuB3ReNoHcKam3/iFJeUX10YelqcxPMMpw5ytSnGr4VRAbSZRWH/XylSIkM74GxUmEyL/aZiAzUQ== Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On 2019-09-23 6:43 a.m., Carlo Pisani wrote: > I need 2000 MTU, 4000 MTU, 7000 MTU, or 9000 MTU > > can someone check the max MTU capability of the built-in lan on a C8000? My c8000 has an intel e1000: [   21.140119] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI The driver supports jumbo packets up to 0x3F00: dave@mx3210:~/linux/linux-stable/drivers/net/ethernet/intel/e1000$ grep  MAX_JUMBO_FRAME_SIZE * e1000_hw.h:#define MAX_JUMBO_FRAME_SIZE         0x3F00 e1000_main.c:   netdev->max_mtu = MAX_JUMBO_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN); e1000_main.c:           /* Capable of supporting up to MAX_JUMBO_FRAME_SIZE limit. */ Dave -- John David Anglin dave.anglin@bell.net