i40e: remove workaround for resetting XPS

Since commit 3ffa037d7f78 ("i40e: Set XPS bit mask to zero in DCB mode")
we've tried to reset the XPS settings by building a custom
empty CPU mask.

This workaround is not necessary because we're not really removing the
XPS setting, but simply setting it so that no CPU is valid.

Second, we shorten the code further by using zalloc_cpumask_var instead
of a separate call to bitmap_zero().

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Orabug: 26785018
(cherry picked from commit ba4460d45a6ec04e29e55e6c97edc0e842c18999)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Kyle Fortin <kyle.fortin@oracle.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 2999724de9003ac2df01f37280c27e4cf149880b..6be8565c253ffac72d18cd776ca5516fa10f4d30 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2917,22 +2917,15 @@ static void i40e_vsi_free_rx_resources(struct i40e_vsi *vsi)
 static void i40e_config_xps_tx_ring(struct i40e_ring *ring)
 {
        struct i40e_vsi *vsi = ring->vsi;
-       cpumask_var_t mask;
 
        if (!ring->q_vector || !ring->netdev)
                return;
 
-       /* Single TC mode enable XPS */
-       if (vsi->tc_config.numtc <= 1) {
-               if (!test_and_set_bit(__I40E_TX_XPS_INIT_DONE, &ring->state))
-                       netif_set_xps_queue(ring->netdev,
-                                           &ring->q_vector->affinity_mask,
-                                           ring->queue_index);
-       } else if (alloc_cpumask_var(&mask, GFP_KERNEL)) {
-               /* Disable XPS to allow selection based on TC */
-               bitmap_zero(cpumask_bits(mask), nr_cpumask_bits);
-               netif_set_xps_queue(ring->netdev, mask, ring->queue_index);
-               free_cpumask_var(mask);
+       if ((vsi->tc_config.numtc <= 1) &&
+           !test_and_set_bit(__I40E_TX_XPS_INIT_DONE, &ring->state)) {
+               netif_set_xps_queue(ring->netdev,
+                                   &ring->q_vector->affinity_mask,
+                                   ring->queue_index);
        }
 
        /* schedule our worker thread which will take care of