[Intel-wired-lan] [PATCH v4 iwl-net 3/8] ice: replace synchronize_rcu with synchronize_net

[Maciej Fijalkowski]

Given that ice_qp_dis() is called under rtnl_lock, synchronize_net() can
be called instead of synchronize_rcu() so that XDP rings can finish its
job in a faster way. Also let us do this as earlier in XSK queue disable
flow.

Additionally, turn off regular Tx queue before disabling irqs and NAPI.

Fixes: 2d4238f55697 ("ice: Add support for AF_XDP")
Reviewed-by: Shannon Nelson <shannon.nel...@amd.com>
Tested-by: Chandan Kumar Rout <chandanx.r...@intel.com> (A Contingent Worker at 
Intel)
Signed-off-by: Maciej Fijalkowski <maciej.fijalkow...@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_xsk.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c 
b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 3104a5657b83..ba50af9a5929 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -52,10 +52,8 @@ static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 
q_idx)
 static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx)
 {
        ice_clean_tx_ring(vsi->tx_rings[q_idx]);
-       if (ice_is_xdp_ena_vsi(vsi)) {
-               synchronize_rcu();
+       if (ice_is_xdp_ena_vsi(vsi))
                ice_clean_tx_ring(vsi->xdp_rings[q_idx]);
-       }
        ice_clean_rx_ring(vsi->rx_rings[q_idx]);
 }
 
@@ -180,11 +178,12 @@ static int ice_qp_dis(struct ice_vsi *vsi, u16 q_idx)
                usleep_range(1000, 2000);
        }
 
+       synchronize_net();
+       netif_tx_stop_queue(netdev_get_tx_queue(vsi->netdev, q_idx));
+
        ice_qvec_dis_irq(vsi, rx_ring, q_vector);
        ice_qvec_toggle_napi(vsi, q_vector, false);
 
-       netif_tx_stop_queue(netdev_get_tx_queue(vsi->netdev, q_idx));
-
        ice_fill_txq_meta(vsi, tx_ring, &txq_meta);
        err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, tx_ring, &txq_meta);
        if (err)
-- 
2.34.1