netdev - [PATCH net-next 3/3] net: qualcomm: rmnet: add ethtool support for configuring tx aggregation

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Message-Id: <20221109180249.4721-4-dnlplm@gmail.com>
Date:   Wed,  9 Nov 2022 19:02:49 +0100
From:   Daniele Palmas <dnlplm@...il.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Subash Abhinov Kasiviswanathan <quic_subashab@...cinc.com>,
        Sean Tranchetti <quic_stranche@...cinc.com>,
        Jonathan Corbet <corbet@....net>
Cc:     Bjørn Mork <bjorn@...k.no>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev@...r.kernel.org, Daniele Palmas <dnlplm@...il.com>
Subject: [PATCH net-next 3/3] net: qualcomm: rmnet: add ethtool support for configuring tx aggregation

Add support for ETHTOOL_COALESCE_TX_AGGR for configuring the tx
aggregation settings.

Signed-off-by: Daniele Palmas <dnlplm@...il.com>
---
 .../net/ethernet/qualcomm/rmnet/rmnet_vnd.c   | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
index 1b2119b1d48a..630cf6737f64 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
@@ -210,7 +210,51 @@ static void rmnet_get_ethtool_stats(struct net_device *dev,
 	memcpy(data, st, ARRAY_SIZE(rmnet_gstrings_stats) * sizeof(u64));
 }
 
+static int rmnet_get_coalesce(struct net_device *dev,
+			      struct ethtool_coalesce *coal,
+			      struct kernel_ethtool_coalesce *kernel_coal,
+			      struct netlink_ext_ack *extack)
+{
+	struct rmnet_priv *priv = netdev_priv(dev);
+	struct rmnet_port *port;
+
+	port = rmnet_get_port_rtnl(priv->real_dev);
+
+	memset(kernel_coal, 0, sizeof(*kernel_coal));
+	kernel_coal->tx_max_aggr_size = port->egress_agg_params.agg_size;
+	kernel_coal->tx_max_aggr_frames = port->egress_agg_params.agg_count;
+	kernel_coal->tx_usecs_aggr_time = port->egress_agg_params.agg_time_nsec / NSEC_PER_USEC;
+
+	return 0;
+}
+
+static int rmnet_set_coalesce(struct net_device *dev,
+			      struct ethtool_coalesce *coal,
+			      struct kernel_ethtool_coalesce *kernel_coal,
+			      struct netlink_ext_ack *extack)
+{
+	struct rmnet_priv *priv = netdev_priv(dev);
+	struct rmnet_port *port;
+
+	port = rmnet_get_port_rtnl(priv->real_dev);
+
+	if (kernel_coal->tx_max_aggr_frames <= 1 || kernel_coal->tx_max_aggr_frames > 64)
+		return -EINVAL;
+
+	if (kernel_coal->tx_max_aggr_size > 32768)
+		return -EINVAL;
+
+	rmnet_map_update_ul_agg_config(port, kernel_coal->tx_max_aggr_size,
+				       kernel_coal->tx_max_aggr_frames,
+				       kernel_coal->tx_usecs_aggr_time);
+
+	return 0;
+}
+
 static const struct ethtool_ops rmnet_ethtool_ops = {
+	.supported_coalesce_params = ETHTOOL_COALESCE_TX_AGGR,
+	.get_coalesce		= rmnet_get_coalesce,
+	.set_coalesce		= rmnet_set_coalesce,
 	.get_ethtool_stats = rmnet_get_ethtool_stats,
 	.get_strings = rmnet_get_strings,
 	.get_sset_count = rmnet_get_sset_count,
-- 
2.37.1