ixgbe: Clean up a useless switch statement and dead code in configure_srrctl

This patch replaces a switch statement for an 82598 workaround with an if
statement that only applies to 82598. In addition I am pulling out several
dead pieces of code and instead of reading the SRRCTL register and then
modifying it we are just writing a value which we generate from scratch.
Finally I am also removing any drop enable related code since that was
moved to a function of its own.

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>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 3a807ff..d3cf887 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -2847,40 +2847,34 @@ static void ixgbe_set_rx_drop_en(struct ixgbe_adapter *adapter)
 static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter,
                                   struct ixgbe_ring *rx_ring)
 {
+       struct ixgbe_hw *hw = &adapter->hw;
        u32 srrctl;
        u8 reg_idx = rx_ring->reg_idx;
 
-       switch (adapter->hw.mac.type) {
-       case ixgbe_mac_82598EB: {
-               struct ixgbe_ring_feature *feature = adapter->ring_feature;
-               const int mask = feature[RING_F_RSS].mask;
-               reg_idx = reg_idx & mask;
-       }
-               break;
-       case ixgbe_mac_82599EB:
-       case ixgbe_mac_X540:
-       default:
-               break;
-       }
-
-       srrctl = IXGBE_READ_REG(&adapter->hw, IXGBE_SRRCTL(reg_idx));
+       if (hw->mac.type == ixgbe_mac_82598EB) {
+               u16 mask = adapter->ring_feature[RING_F_RSS].mask;
 
-       srrctl &= ~IXGBE_SRRCTL_BSIZEHDR_MASK;
-       srrctl &= ~IXGBE_SRRCTL_BSIZEPKT_MASK;
-       if (adapter->num_vfs)
-               srrctl |= IXGBE_SRRCTL_DROP_EN;
+               /*
+                * if VMDq is not active we must program one srrctl register
+                * per RSS queue since we have enabled RDRXCTL.MVMEN
+                */
+               reg_idx &= mask;
+       }
 
-       srrctl |= (IXGBE_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
-                 IXGBE_SRRCTL_BSIZEHDR_MASK;
+       /* configure header buffer length, needed for RSC */
+       srrctl = IXGBE_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
 
+       /* configure the packet buffer length */
 #if PAGE_SIZE > IXGBE_MAX_RXBUFFER
        srrctl |= IXGBE_MAX_RXBUFFER >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
 #else
        srrctl |= ixgbe_rx_bufsz(rx_ring) >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
 #endif
+
+       /* configure descriptor type */
        srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;
 
-       IXGBE_WRITE_REG(&adapter->hw, IXGBE_SRRCTL(reg_idx), srrctl);
+       IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(reg_idx), srrctl);
 }
 
 static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)