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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C4EDC3A5A7 for ; Tue, 6 Dec 2022 18:35:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229751AbiLFSfp (ORCPT ); Tue, 6 Dec 2022 13:35:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229714AbiLFSfV (ORCPT ); Tue, 6 Dec 2022 13:35:21 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8ABAD6349; Tue, 6 Dec 2022 10:35:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1670351706; x=1701887706; h=from:to:subject:date:message-id:in-reply-to:references: mime-version; bh=A5PoAKCak51gwau3gk4Z68MLvJ/ijOTtPKUqHzhQ844=; b=yyX2q3uG9h0PsCQ0VdOZlJRgVAKgL1PyJh3H/YgdI4C2wJ4aqTOj27+Q xZItiOy3iZrEy+Eh1zque79eQVbYw1VMxXPIG6I5ZiHKHKikzrIEW5/hX /JwNaOqYZCtxECmG4g2dIGmS6KWMQXSXjZOHSp+pTEdTHRdYYTdEOSEW7 ryFyKw2RQN6Wwa0+LEVsiqLvVw/j6GRybGx4k538RqYfjAmLiCFXM+VQV r7ejqXNJWzclAh0HH7mUsbBbaLJlhcEZSejPA5VVJSHUToCaHVtkSn590 uoQkISNBD3e7kwdKh+/Thyq8DSmhXd+iXdvnFV+lHxpTK7bnhKwLU5SBI w==; X-IronPort-AV: E=Sophos;i="5.96,223,1665471600"; d="scan'208";a="126791961" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 06 Dec 2022 11:35:05 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.12; Tue, 6 Dec 2022 11:35:05 -0700 Received: from AUS-LT-C33025.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Tue, 6 Dec 2022 11:35:03 -0700 From: Jerry Ray To: Andrew Lunn , Florian Fainelli , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , "Paolo Abeni" , , , , Jerry Ray Subject: [PATCH net-next v3 1/2] dsa: lan9303: Add port_max_mtu API Date: Tue, 6 Dec 2022 12:34:59 -0600 Message-ID: <20221206183500.6898-2-jerry.ray@microchip.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221206183500.6898-1-jerry.ray@microchip.com> References: <20221206183500.6898-1-jerry.ray@microchip.com> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding in support for reporting the max mtu for a given port. Signed-off-by: Jerry Ray --- drivers/net/dsa/lan9303-core.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c index 80f07bd20593..baa336bb9d15 100644 --- a/drivers/net/dsa/lan9303-core.c +++ b/drivers/net/dsa/lan9303-core.c @@ -1279,6 +1279,25 @@ static int lan9303_port_mdb_del(struct dsa_switch *ds, int port, return 0; } +/* For non-cpu ports, the max frame size is 1518. + * The CPU port supports a max frame size of 1522. + * There is a JUMBO flag to make the max size 2048, but this driver + * presently does not support using it. + */ +static int lan9303_port_max_mtu(struct dsa_switch *ds, int port) +{ + struct net_device *p = dsa_port_to_master(dsa_to_port(ds, port)); + struct lan9303 *chip = ds->priv; + + dev_dbg(chip->dev, "%s(%d) entered. NET max_mtu is %d", + __func__, port, p->max_mtu); + + if (dsa_port_is_cpu(dsa_to_port(ds, port))) + return 1522 - ETH_HLEN - ETH_FCS_LEN; + else + return 1518 - ETH_HLEN - ETH_FCS_LEN; +} + static const struct dsa_switch_ops lan9303_switch_ops = { .get_tag_protocol = lan9303_get_tag_protocol, .setup = lan9303_setup, @@ -1299,6 +1318,7 @@ static const struct dsa_switch_ops lan9303_switch_ops = { .port_fdb_dump = lan9303_port_fdb_dump, .port_mdb_add = lan9303_port_mdb_add, .port_mdb_del = lan9303_port_mdb_del, + .port_max_mtu = lan9303_port_max_mtu, }; static int lan9303_register_switch(struct lan9303 *chip) -- 2.17.1