cndm: Add support for ethtool

Signed-off-by: Alex Forencich <alex@alexforencich.com>

src/cndm/modules/cndm/Makefile

@@ -8,6 +8,7 @@ cndm-y += cndm_main.o
 cndm-y += cndm_devlink.o
 cndm-y += cndm_dev.o
 cndm-y += cndm_netdev.o
+cndm-y += cndm_ethtool.o
 cndm-y += cndm_tx.o
 cndm-y += cndm_rx.o
 

src/cndm/modules/cndm/cndm.h

@@ -141,6 +141,9 @@ void cndm_destroy_netdev(struct net_device *ndev);
 // cndm_dev.c
 extern const struct file_operations cndm_fops;
 
+// cndm_ethtool.c
+extern const struct ethtool_ops cndm_ethtool_ops;
+
 // cndm_tx.c
 int cndm_free_tx_buf(struct cndm_priv *priv);
 int cndm_poll_tx_cq(struct napi_struct *napi, int budget);

src/cndm/modules/cndm/cndm_ethtool.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL
+/*
+
+Copyright (c) 2025 FPGA Ninja, LLC
+
+Authors:
+- Alex Forencich
+
+*/
+
+#include "cndm.h"
+
+#include <linux/ethtool.h>
+
+static void cndm_get_drvinfo(struct net_device *ndev,
+	struct ethtool_drvinfo *drvinfo)
+{
+	struct cndm_priv *priv = netdev_priv(ndev);
+	struct cndm_dev *cdev = priv->cdev;
+
+	strscpy(drvinfo->driver, DRIVER_NAME, sizeof(drvinfo->driver));
+	strscpy(drvinfo->version, DRIVER_VERSION, sizeof(drvinfo->version));
+	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "TODO"); // TODO
+	strscpy(drvinfo->bus_info, dev_name(cdev->dev), sizeof(drvinfo->bus_info));
+}
+
+const struct ethtool_ops cndm_ethtool_ops = {
+	.get_drvinfo = cndm_get_drvinfo,
+};

src/cndm/modules/cndm/cndm_netdev.c

@@ -104,6 +104,7 @@ struct net_device *cndm_create_netdev(struct cndm_dev *cdev, int port, void __io
 	eth_hw_addr_random(ndev);
 
 	ndev->netdev_ops = &cndm_netdev_ops;
+	ndev->ethtool_ops = &cndm_ethtool_ops;
 
 	ndev->hw_features = 0;
 	ndev->features = 0;