[PATCH 3/3] net: ntb_netdev: Expose queue pair count via ethtool -l

[Koichiro Den <den@valinux.co.jp>]

Implement the read-only get_channels ethtool callback so the active
number of queue pairs is visible via ethtool -l.

Report dev->num_queues as the combined channel count and maximum. The
driver does not support changing the channel count at runtime, so no
set_channels implementation is provided.

Signed-off-by: Koichiro Den <den@valinux.co.jp>
---
 drivers/net/ntb_netdev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ntb_netdev.c b/drivers/net/ntb_netdev.c
index 837a2e95f06e..185cc9ddfce7 100644
--- a/drivers/net/ntb_netdev.c
+++ b/drivers/net/ntb_netdev.c
@@ -470,10 +470,20 @@ static int ntb_get_link_ksettings(struct net_device *dev,
 	return 0;
 }
 
+static void ntb_get_channels(struct net_device *ndev,
+			     struct ethtool_channels *channels)
+{
+	struct ntb_netdev *dev = netdev_priv(ndev);
+
+	channels->max_combined = dev->num_queues;
+	channels->combined_count = dev->num_queues;
+}
+
 static const struct ethtool_ops ntb_ethtool_ops = {
 	.get_drvinfo = ntb_get_drvinfo,
 	.get_link = ethtool_op_get_link,
 	.get_link_ksettings = ntb_get_link_ksettings,
+	.get_channels = ntb_get_channels,
 };
 
 static const struct ntb_queue_handlers ntb_netdev_handlers = {
-- 
2.51.0