linux-kernel - [PATCH] enic: add ethtool get

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Message-ID: <20240618160146.3900470-1-jon@nutanix.com>
Date: Tue, 18 Jun 2024 09:01:46 -0700
From: Jon Kohler <jon@...anix.com>
To: Christian Benvenuti <benve@...co.com>, Satish Kharat <satishkh@...co.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc: Jon Kohler <jon@...anix.com>
Subject: [PATCH] enic: add ethtool get_channel support

Add .get_channel to enic_ethtool_ops to enable basic ethtool -l
support to get the current channel configuration.

Note that the driver does not support dynamically changing queue
configuration, so .set_channel is intentionally unused. Instead, users
should use Cisco's hardware management tools (UCSM/IMC) to modify
virtual interface card configuration out of band.

Signed-off-by: Jon Kohler <jon@...anix.com>
---
 drivers/net/ethernet/cisco/enic/enic_ethtool.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/ethernet/cisco/enic/enic_ethtool.c b/drivers/net/ethernet/cisco/enic/enic_ethtool.c
index 241906697019..efbc0715b10e 100644
--- a/drivers/net/ethernet/cisco/enic/enic_ethtool.c
+++ b/drivers/net/ethernet/cisco/enic/enic_ethtool.c
@@ -608,6 +608,23 @@ static int enic_get_ts_info(struct net_device *netdev,
 	return 0;
 }
 
+static void enic_get_channels(struct net_device *netdev,
+			      struct ethtool_channels *channels)
+{
+	struct enic *enic = netdev_priv(netdev);
+
+	channels->max_rx = ENIC_RQ_MAX;
+	channels->max_tx = ENIC_WQ_MAX;
+	channels->rx_count = enic->rq_count;
+	channels->tx_count = enic->wq_count;
+
+	/* enic doesn't use other channels or combined channels */
+	channels->combined_count = 0;
+	channels->max_combined = 0;
+	channels->max_other = 0;
+	channels->other_count = 0;
+}
+
 static const struct ethtool_ops enic_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
@@ -632,6 +649,7 @@ static const struct ethtool_ops enic_ethtool_ops = {
 	.set_rxfh = enic_set_rxfh,
 	.get_link_ksettings = enic_get_ksettings,
 	.get_ts_info = enic_get_ts_info,
+	.get_channels = enic_get_channels,
 };
 
 void enic_set_ethtool_ops(struct net_device *netdev)
-- 
2.43.0