ixgbe: Add support for set_channels ethtool operation

This change adds support for the ethtool set_channels operation.

Since the ixgbe driver has to support DCB as well as the other modes the
assumption I made here is that the number of channels in DCB modes refers
to the number of queues per traffic class, not the number of queues total.

CC: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index cba27c63ebb3..7349a8b4a534 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -2802,6 +2802,43 @@ static void ixgbe_get_channels(struct net_device *dev,
         ch->combined_count = adapter->ring_feature[RING_F_FDIR].indices;
 }
 
+static int ixgbe_set_channels(struct net_device *dev,
+                              struct ethtool_channels *ch)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(dev);
+        unsigned int count = ch->combined_count;
+
+        /* verify they are not requesting separate vectors */
+        if (!count || ch->rx_count || ch->tx_count)
+                return -EINVAL;
+
+        /* verify other_count has not changed */
+        if (ch->other_count != NON_Q_VECTORS)
+                return -EINVAL;
+
+        /* verify the number of channels does not exceed hardware limits */
+        if (count > ixgbe_max_channels(adapter))
+                return -EINVAL;
+
+        /* update feature limits from largest to smallest supported values */
+        adapter->ring_feature[RING_F_FDIR].limit = count;
+
+        /* cap RSS limit at 16 */
+        if (count > IXGBE_MAX_RSS_INDICES)
+                count = IXGBE_MAX_RSS_INDICES;
+        adapter->ring_feature[RING_F_RSS].limit = count;
+
+#ifdef IXGBE_FCOE
+        /* cap FCoE limit at 8 */
+        if (count > IXGBE_FCRETA_SIZE)
+                count = IXGBE_FCRETA_SIZE;
+        adapter->ring_feature[RING_F_FCOE].limit = count;
+
+#endif
+        /* use setup TC to update any traffic class queue mapping */
+        return ixgbe_setup_tc(dev, netdev_get_num_tc(dev));
+}
+
 static const struct ethtool_ops ixgbe_ethtool_ops = {
         .get_settings           = ixgbe_get_settings,
         .set_settings           = ixgbe_set_settings,
@@ -2831,6 +2868,7 @@ static const struct ethtool_ops ixgbe_ethtool_ops = {
         .get_rxnfc              = ixgbe_get_rxnfc,
         .set_rxnfc              = ixgbe_set_rxnfc,
         .get_channels           = ixgbe_get_channels,
+        .set_channels           = ixgbe_set_channels,
         .get_ts_info            = ixgbe_get_ts_info,
 };