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@nutanix.com>
Link: https://patch.msgid.link/20240627202013.2398217-1-jon@nutanix.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/cisco/enic/enic_ethtool.c b/drivers/net/ethernet/cisco/enic/enic_ethtool.c
index 24190669701900287209ecde093870571b359db7..a42f3f280f3e330bedfc446103e050020a11af54 100644 (file)
--- a/drivers/net/ethernet/cisco/enic/enic_ethtool.c
+++ b/drivers/net/ethernet/cisco/enic/enic_ethtool.c
@@ -608,6 +608,28 @@ 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);
+
+       switch (vnic_dev_get_intr_mode(enic->vdev)) {
+       case VNIC_DEV_INTR_MODE_MSIX:
+               channels->max_rx = ENIC_RQ_MAX;
+               channels->max_tx = ENIC_WQ_MAX;
+               channels->rx_count = enic->rq_count;
+               channels->tx_count = enic->wq_count;
+               break;
+       case VNIC_DEV_INTR_MODE_MSI:
+       case VNIC_DEV_INTR_MODE_INTX:
+               channels->max_combined = 1;
+               channels->combined_count = 1;
+               break;
+       default:
+               break;
+       }
+}
+
 static const struct ethtool_ops enic_ethtool_ops = {
        .supported_coalesce_params = ETHTOOL_COALESCE_USECS |
                                     ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
@@ -632,6 +654,7 @@ 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)