From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 8CAF8334374 for ; Fri, 9 Jan 2026 12:26:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767961572; cv=none; b=kJ/m7aRDJUGCsb1yO+3uFBIYIjV6eYkMpvc0MzeBPVcgbDtLWKj5VHFXI4xyQdvGPbmhjr2QW/+AE3JPBKPJj357oW8/77WwI+qqrioxN+9QhBAPmV6+r3W6IJY6ogNladI7pBvZIZnEc2qfnz1FqdyiYYwTeGFNUBPzX8G+Npg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767961572; c=relaxed/simple; bh=7jM1UtncRIoXqwjpezsk+5Fa42ngJjTjGo1vsyQ0C/o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=elH7Y6iyLckB865Jj8+jlQB9qHOs3/WVjGuNFKfoMXdpgBbe8gWvzx81+/hRRdjQXPcNr788GbXFff0PxJK8lLLZHMMjgIZSbVhlY49aU07fS0Ph8RhiOwhK/QgHmUP4RtP+30RUiWLZdb64Jqx7zI8sKOG95JmUfQuG8M0I7cE= 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=mWIdemc9; arc=none smtp.client-ip=198.175.65.14 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="mWIdemc9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1767961572; x=1799497572; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7jM1UtncRIoXqwjpezsk+5Fa42ngJjTjGo1vsyQ0C/o=; b=mWIdemc96ZqSKoO6/i45ZYungCCIUQwWoF2YQFnSOiFy6EwTOYB+e8jS QldgnWoE+Y3H7LqU/e4KWI7Nr0Viml/LvuzWtPOtB7feLqTuWaX3hG8aj wXN44xzLbPfNigGZLMFTr+FCdh2a22BXgejQdrNCCIG1m3ZGSNLkbJf+7 tugFlJ3OzkyLbFu+eWZFDAm8gh4GMXWGEiDLRiKzb4JhVWyB+0h8XTEpr wx64D6qBK/ME9x8SIJ2y/59+R8B5ilD7Mt7grbH5Yq1VKVZ6t/8Bcoq/a LrWF5XJrWbajQV6pNRiSmdbnarbiELwLOhJxWCnDljLoj4aBv6qIsdeID A==; X-CSE-ConnectionGUID: /l0hTCYwSzOTVRuIqb1hkg== X-CSE-MsgGUID: j/1HEXb9TkWquCjMxq17kw== X-IronPort-AV: E=McAfee;i="6800,10657,11665"; a="73188984" X-IronPort-AV: E=Sophos;i="6.21,212,1763452800"; d="scan'208";a="73188984" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jan 2026 04:26:11 -0800 X-CSE-ConnectionGUID: kUdHPCKhSzq4wCKkQyq7RQ== X-CSE-MsgGUID: kgx8MIOQTg+X1xa/vIKtnQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,212,1763452800"; d="scan'208";a="234169174" Received: from black.igk.intel.com ([10.91.253.5]) by orviesa002.jf.intel.com with ESMTP; 09 Jan 2026 04:26:08 -0800 Received: by black.igk.intel.com (Postfix, from userid 1001) id DF94B9B; Fri, 09 Jan 2026 13:26:06 +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 , Jay Vosburgh , Simon Horman , Mika Westerberg Subject: [PATCH RESEND net-next v2 2/5] net: thunderbolt: Allow changing MTU of the device Date: Fri, 9 Jan 2026 13:26:03 +0100 Message-ID: <20260109122606.3586895-3-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260109122606.3586895-1-mika.westerberg@linux.intel.com> References: <20260109122606.3586895-1-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