i40e: fix lookup table when RSS disabled/enabled

Orabug: 24568124

This patch fixes the bug which causes RSS to continue to work
after being disabled.  After disabling RSS, traffic would continue
to be assigned to different queues instead of falling back to a
single queue. Without this patch, attempting to disable RSS would
not work as expected. This patch fixes the bug by clearing the
lookup table used by RSS such that all traffic is assigned to a
single queue.  This patch also addresses the issue of reinstating
 the lookup table should RSS then be re-enabled.

Change-ID: Ib20c7c6a7e9f1f772bb787370f8a8c664796b141
Signed-off-by: Alan Brady <alan.brady@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit d8ec98646483a9e1c0c9f511236ce8b933deed17)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index edf715c1748a390d3669d37616304a8739123541..7a57efc9172db7621a29ac3ba4e882876a126422 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -8594,6 +8594,28 @@ bool i40e_set_ntuple(struct i40e_pf *pf, netdev_features_t features)
        return need_reset;
 }
 
+/**
+ * i40e_clear_rss_lut - clear the rx hash lookup table
+ * @vsi: the VSI being configured
+ **/
+static void i40e_clear_rss_lut(struct i40e_vsi *vsi)
+{
+       struct i40e_pf *pf = vsi->back;
+       struct i40e_hw *hw = &pf->hw;
+       u16 vf_id = vsi->vf_id;
+       u8 i;
+
+       if (vsi->type == I40E_VSI_MAIN) {
+               for (i = 0; i <= I40E_PFQF_HLUT_MAX_INDEX; i++)
+                       wr32(hw, I40E_PFQF_HLUT(i), 0);
+       } else if (vsi->type == I40E_VSI_SRIOV) {
+               for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++)
+                       i40e_write_rx_ctl(hw, I40E_VFQF_HLUT1(i, vf_id), 0);
+       } else {
+               dev_err(&pf->pdev->dev, "Cannot set RSS LUT - invalid VSI type\n");
+       }
+}
+
 /**
  * i40e_set_features - set the netdev feature flags
  * @netdev: ptr to the netdev being adjusted
@@ -8607,6 +8629,12 @@ static int i40e_set_features(struct net_device *netdev,
        struct i40e_pf *pf = vsi->back;
        bool need_reset;
 
+       if (features & NETIF_F_RXHASH && !(netdev->features & NETIF_F_RXHASH))
+               i40e_pf_config_rss(pf);
+       else if (!(features & NETIF_F_RXHASH) &&
+                netdev->features & NETIF_F_RXHASH)
+               i40e_clear_rss_lut(vsi);
+
        if (features & NETIF_F_HW_VLAN_CTAG_RX)
                i40e_vlan_stripping_enable(vsi);
        else