From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 35A2D157480 for ; Thu, 27 Nov 2025 13:15:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764249327; cv=none; b=QSVG3I/VK+FCGlktVlfV+rIU5WPUDstNacQ4mFAg8JMjydLGY3BjJNyVPxu6sE0zQFQItlNlSCAezG0RdgNH27G3t+ppavT/pk84rse7ZlAOC75ZQnuldGsYx804WwNAFyshTco/nIF9H1vJrWvkRyN9a0AwAqmlvWmv3Byot2E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764249327; c=relaxed/simple; bh=7jM1UtncRIoXqwjpezsk+5Fa42ngJjTjGo1vsyQ0C/o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TZHpjDdFyzLbmHD3rYzf9q+DSjjDpmJKdXXA2ua0pj+Zd6wIVoGBfz1CxE3NacWJprvLB0x/y7yGGbsqhrdiNQirjHtWtxPqdBDPS1YwPrfM8BfGB0DdMXI2dGH/ZlA2iSnzuWocNLYoElZTWix9vRiaPPGeAuoDTwqbj2chEY0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=S6vqAOtA; arc=none smtp.client-ip=192.198.163.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="S6vqAOtA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1764249325; x=1795785325; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7jM1UtncRIoXqwjpezsk+5Fa42ngJjTjGo1vsyQ0C/o=; b=S6vqAOtAIRgJeN3gIfRXk/kDAlJbkXzE+JsGLxQsNbWVZKgUzEgeJcKR Z+V3t0qWoSXlmsnjZdvJUScO2IOlo00AGUzqrB3OnTewymdtYj/qqh04O Z1oghPmwzydrVUCMUuIrD/f9NK5WbmNLOxXB5bvsLRGc1psEBaWQD6mpV TRzEoc1vBnP5wxvd6K2qJNrdku4AZ54nRTVJgto4iI/+159x5fwXsO2JF ck8KEaCRR1AEtysm4B///M5VjxPBRU2Y2O/NJiAuXrLBtbTUeT6s/u1Cs zcdxRSiZNRj0jtBldYqqxTrrlJJ25kX8jhe3wOEd27nHRm339nonTwx0q A==; X-CSE-ConnectionGUID: xWTwLwqFQZyFbv3fcUCWJw== X-CSE-MsgGUID: M+16KgrkQW2hio8OhGNK1Q== X-IronPort-AV: E=McAfee;i="6800,10657,11625"; a="70157515" X-IronPort-AV: E=Sophos;i="6.20,231,1758610800"; d="scan'208";a="70157515" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Nov 2025 05:15:24 -0800 X-CSE-ConnectionGUID: B6gBEf/uQUWn1i7pyGO6/Q== X-CSE-MsgGUID: YrFjJkF0ScytUHzQB7QBcg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,231,1758610800"; d="scan'208";a="192892759" Received: from black.igk.intel.com ([10.91.253.5]) by fmviesa007.fm.intel.com with ESMTP; 27 Nov 2025 05:15:22 -0800 Received: by black.igk.intel.com (Postfix, from userid 1001) id 49148A2; Thu, 27 Nov 2025 14:15:21 +0100 (CET) From: Mika Westerberg To: netdev@vger.kernel.org Cc: Yehezkel Bernat , Ian MacDonald , Salvatore Bonaccorso , Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Mika Westerberg Subject: [PATCH net-next 2/3] net: thunderbolt: Allow changing MTU of the device Date: Thu, 27 Nov 2025 14:15:20 +0100 Message-ID: <20251127131521.2580237-3-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251127131521.2580237-1-mika.westerberg@linux.intel.com> References: <20251127131521.2580237-1-mika.westerberg@linux.intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In some cases it is useful to be able to use different MTU than the default one. Especially when dealing against non-Linux networking stack. For this reason add possibility to change the MTU of the device. Signed-off-by: Mika Westerberg --- drivers/net/thunderbolt/main.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/thunderbolt/main.c b/drivers/net/thunderbolt/main.c index 57b226afeb84..20bac55a3e20 100644 --- a/drivers/net/thunderbolt/main.c +++ b/drivers/net/thunderbolt/main.c @@ -1257,12 +1257,23 @@ static void tbnet_get_stats64(struct net_device *dev, stats->rx_missed_errors = net->stats.rx_missed_errors; } +static int tbnet_change_mtu(struct net_device *dev, int new_mtu) +{ + /* Keep the MTU within supported range */ + if (new_mtu < 68 || new_mtu > (TBNET_MAX_MTU - ETH_HLEN)) + return -EINVAL; + + dev->mtu = new_mtu; + return 0; +} + static const struct net_device_ops tbnet_netdev_ops = { .ndo_open = tbnet_open, .ndo_stop = tbnet_stop, .ndo_start_xmit = tbnet_start_xmit, .ndo_set_mac_address = eth_mac_addr, .ndo_get_stats64 = tbnet_get_stats64, + .ndo_change_mtu = tbnet_change_mtu, }; static void tbnet_generate_mac(struct net_device *dev) -- 2.50.1