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 D66D7C433FE for ; Tue, 7 Dec 2021 09:10:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233576AbhLGJOS (ORCPT ); Tue, 7 Dec 2021 04:14:18 -0500 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:42519 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233570AbhLGJOQ (ORCPT ); Tue, 7 Dec 2021 04:14:16 -0500 Received: (Authenticated sender: clement.leger@bootlin.com) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 0ACF7E0005; Tue, 7 Dec 2021 09:10:43 +0000 (UTC) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: "David S. Miller" , Jakub Kicinski , Rob Herring , Vladimir Oltean , Claudiu Manoil , Alexandre Belloni , UNGLinuxDriver@microchip.com, Andrew Lunn Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Petazzoni , Denis Kirjanov , Julian Wiedmann Subject: [PATCH net-next v5 3/4] net: ocelot: add support for ndo_change_mtu Date: Tue, 7 Dec 2021 10:08:52 +0100 Message-Id: <20211207090853.308328-4-clement.leger@bootlin.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211207090853.308328-1-clement.leger@bootlin.com> References: <20211207090853.308328-1-clement.leger@bootlin.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit adds support for changing MTU for the ocelot register based interface. For ocelot, JUMBO frame size can be set up to 25000 bytes but has been set to 9000 which is a saner value and allows for maximum gain of performance with FDMA. Reviewed-by: Vladimir Oltean Signed-off-by: Clément Léger --- drivers/net/ethernet/mscc/ocelot.h | 2 ++ drivers/net/ethernet/mscc/ocelot_net.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h index 1eb0b5ad51e9..bf4eff6d7086 100644 --- a/drivers/net/ethernet/mscc/ocelot.h +++ b/drivers/net/ethernet/mscc/ocelot.h @@ -32,6 +32,8 @@ #define OCELOT_PTP_QUEUE_SZ 128 +#define OCELOT_JUMBO_MTU 9000 + struct ocelot_port_tc { bool block_shared; unsigned long offload_cnt; diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c index d9694dc14a2d..d83d3ffba3ac 100644 --- a/drivers/net/ethernet/mscc/ocelot_net.c +++ b/drivers/net/ethernet/mscc/ocelot_net.c @@ -764,10 +764,23 @@ static int ocelot_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) return phy_mii_ioctl(dev->phydev, ifr, cmd); } +static int ocelot_change_mtu(struct net_device *dev, int new_mtu) +{ + struct ocelot_port_private *priv = netdev_priv(dev); + struct ocelot_port *ocelot_port = &priv->port; + struct ocelot *ocelot = ocelot_port->ocelot; + + ocelot_port_set_maxlen(ocelot, priv->chip_port, new_mtu); + WRITE_ONCE(dev->mtu, new_mtu); + + return 0; +} + static const struct net_device_ops ocelot_port_netdev_ops = { .ndo_open = ocelot_port_open, .ndo_stop = ocelot_port_stop, .ndo_start_xmit = ocelot_port_xmit, + .ndo_change_mtu = ocelot_change_mtu, .ndo_set_rx_mode = ocelot_set_rx_mode, .ndo_set_mac_address = ocelot_port_set_mac_address, .ndo_get_stats64 = ocelot_get_stats64, @@ -1670,6 +1683,7 @@ int ocelot_probe_port(struct ocelot *ocelot, int port, struct regmap *target, dev->netdev_ops = &ocelot_port_netdev_ops; dev->ethtool_ops = &ocelot_ethtool_ops; + dev->max_mtu = OCELOT_JUMBO_MTU; dev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_RXFCS | NETIF_F_HW_TC; -- 2.34.1