i40e: Add basic support for get/set channels for RSS

Implement the number of receive/transmit queue pair being
changed on the fly by ethtool.

Change-Id: I70df2363f1ca40b63610baa561c5b6b92b81bca7
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index fcb6def..d6681f6 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1472,6 +1472,94 @@ static int i40e_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
        return ret;
 }
 
+/**
+ * i40e_max_channels - get Max number of combined channels supported
+ * @vsi: vsi pointer
+ **/
+static unsigned int i40e_max_channels(struct i40e_vsi *vsi)
+{
+       /* TODO: This code assumes DCB and FD is disabled for now. */
+       return vsi->alloc_queue_pairs;
+}
+
+/**
+ * i40e_get_channels - Get the current channels enabled and max supported etc.
+ * @netdev: network interface device structure
+ * @ch: ethtool channels structure
+ *
+ * We don't support separate tx and rx queues as channels. The other count
+ * represents how many queues are being used for control. max_combined counts
+ * how many queue pairs we can support. They may not be mapped 1 to 1 with
+ * q_vectors since we support a lot more queue pairs than q_vectors.
+ **/
+static void i40e_get_channels(struct net_device *dev,
+                              struct ethtool_channels *ch)
+{
+       struct i40e_netdev_priv *np = netdev_priv(dev);
+       struct i40e_vsi *vsi = np->vsi;
+       struct i40e_pf *pf = vsi->back;
+
+       /* report maximum channels */
+       ch->max_combined = i40e_max_channels(vsi);
+
+       /* report info for other vector */
+       ch->other_count = (pf->flags & I40E_FLAG_FDIR_ENABLED) ? 1 : 0;
+       ch->max_other = ch->other_count;
+
+       /* Note: This code assumes DCB is disabled for now. */
+       ch->combined_count = vsi->num_queue_pairs;
+}
+
+/**
+ * i40e_set_channels - Set the new channels count.
+ * @netdev: network interface device structure
+ * @ch: ethtool channels structure
+ *
+ * The new channels count may not be the same as requested by the user
+ * since it gets rounded down to a power of 2 value.
+ **/
+static int i40e_set_channels(struct net_device *dev,
+                             struct ethtool_channels *ch)
+{
+       struct i40e_netdev_priv *np = netdev_priv(dev);
+       unsigned int count = ch->combined_count;
+       struct i40e_vsi *vsi = np->vsi;
+       struct i40e_pf *pf = vsi->back;
+       int new_count;
+
+       /* We do not support setting channels for any other VSI at present */
+       if (vsi->type != I40E_VSI_MAIN)
+               return -EINVAL;
+
+       /* 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 != ((pf->flags & I40E_FLAG_FDIR_ENABLED) ? 1 : 0))
+               return -EINVAL;
+
+       /* verify the number of channels does not exceed hardware limits */
+       if (count > i40e_max_channels(vsi))
+               return -EINVAL;
+
+       /* update feature limits from largest to smallest supported values */
+       /* TODO: Flow director limit, DCB etc */
+
+       /* cap RSS limit */
+       if (count > pf->rss_size_max)
+               count = pf->rss_size_max;
+
+       /* use rss_reconfig to rebuild with new queue count and update traffic
+        * class queue mapping
+        */
+       new_count = i40e_reconfig_rss_queues(pf, count);
+       if (new_count > 1)
+               return 0;
+       else
+               return -EINVAL;
+}
+
 static const struct ethtool_ops i40e_ethtool_ops = {
        .get_settings           = i40e_get_settings,
        .get_drvinfo            = i40e_get_drvinfo,
@@ -1496,6 +1584,8 @@ static const struct ethtool_ops i40e_ethtool_ops = {
        .get_ethtool_stats      = i40e_get_ethtool_stats,
        .get_coalesce           = i40e_get_coalesce,
        .set_coalesce           = i40e_set_coalesce,
+       .get_channels           = i40e_get_channels,
+       .set_channels           = i40e_set_channels,
        .get_ts_info            = i40e_get_ts_info,
 };