netdev - Re: [net-next v3 4/6] net: marvell: prestera: Add ethtool interface support

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Date:   Sun, 26 Jul 2020 11:46:27 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mickey Rachamim <mickeyr@...vell.com>
Subject: Re: [net-next v3 4/6] net: marvell: prestera: Add ethtool interface
 support

Sat, Jul 25, 2020 at 05:06:49PM CEST, vadym.kochan@...ision.eu wrote:
>The ethtool API provides support for the configuration of the following
>features: speed and duplex, auto-negotiation, MDI-x, forward error
>correction, port media type. The API also provides information about the
>port status, hardware and software statistic. The following limitation
>exists:
>
>    - port media type should be configured before speed setting
>    - ethtool -m option is not supported
>    - ethtool -p option is not supported
>    - ethtool -r option is supported for RJ45 port only
>    - the following combination of parameters is not supported:
>
>          ethtool -s sw1pX port XX autoneg on
>
>    - forward error correction feature is supported only on SFP ports, 10G
>      speed
>
>    - auto-negotiation and MDI-x features are not supported on
>      Copper-to-Fiber SFP module
>
>Signed-off-by: Andrii Savka <andrii.savka@...ision.eu>
>Signed-off-by: Serhiy Boiko <serhiy.boiko@...ision.eu>
>Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
>---

[...]

	
>+
>+void prestera_ethtool_get_stats(struct net_device *dev,
>+				struct ethtool_stats *stats, u64 *data)
>+{
>+	struct prestera_port *port = netdev_priv(dev);
>+	struct prestera_port_stats *port_stats;
>+
>+	port_stats = &port->cached_hw_stats.stats;
>+
>+	memcpy((u8 *)data, port_stats, sizeof(*port_stats));

Avoid the needless cast.


[...]
	
	
>+static const struct ethtool_ops ethtool_ops = {
>+	.get_drvinfo = prestera_ethtool_get_drvinfo,
>+	.get_link_ksettings = prestera_ethtool_get_link_ksettings,
>+	.set_link_ksettings = prestera_ethtool_set_link_ksettings,
>+	.get_fecparam = prestera_ethtool_get_fecparam,
>+	.set_fecparam = prestera_ethtool_set_fecparam,
>+	.get_sset_count = prestera_ethtool_get_sset_count,
>+	.get_strings = prestera_ethtool_get_strings,
>+	.get_ethtool_stats = prestera_ethtool_get_stats,
>+	.get_link = ethtool_op_get_link,
>+	.nway_reset = prestera_ethtool_nway_reset
>+};

Have the struct in prestera_ethtool.c and export just the struct instead
of all the callbacks.


>+
> static int prestera_port_create(struct prestera_switch *sw, u32 id)
> {
> 	struct prestera_port *port;
>@@ -235,6 +266,7 @@ static int prestera_port_create(struct prestera_switch *sw, u32 id)
> 
> 	dev->features |= NETIF_F_NETNS_LOCAL;
> 	dev->netdev_ops = &netdev_ops;
>+	dev->ethtool_ops = &ethtool_ops;
> 
> 	netif_carrier_off(dev);
> 
>-- 
>2.17.1
>