igc: field get conversion

Refactor the igc driver to use FIELD_GET() for mask and shift reads,
which reduces lines of code and adds clarity of intent.

This code was generated by the following coccinelle/spatch script and
then manually repaired in a later patch.

@get@
constant shift,mask;
type T;
expression a;
@@
-((T)((a) & mask) >> shift)
+FIELD_GET(mask, a)

and applied via:
spatch --sp-file field_prep.cocci --in-place --dir \
 drivers/net/ethernet/intel/

Cc: Julia Lawall <Julia.Lawall@inria.fr>
Reviewed-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/igc/igc_base.c

@@ -68,8 +68,7 @@ static s32 igc_init_nvm_params_base(struct igc_hw *hw)
 	u32 eecd = rd32(IGC_EECD);
 	u16 size;
 
-	size = (u16)((eecd & IGC_EECD_SIZE_EX_MASK) >>
-		     IGC_EECD_SIZE_EX_SHIFT);
+	size = FIELD_GET(IGC_EECD_SIZE_EX_MASK, eecd);
 
 	/* Added to a constant, "size" becomes the left-shift value
 	 * for setting word_size.
@@ -162,8 +161,7 @@ static s32 igc_init_phy_params_base(struct igc_hw *hw)
 	phy->reset_delay_us	= 100;
 
 	/* set lan id */
-	hw->bus.func = (rd32(IGC_STATUS) & IGC_STATUS_FUNC_MASK) >>
-			IGC_STATUS_FUNC_SHIFT;
+	hw->bus.func = FIELD_GET(IGC_STATUS_FUNC_MASK, rd32(IGC_STATUS));
 
 	/* Make sure the PHY is in a good state. Several people have reported
 	 * firmware leaving the PHY's page select register set to something

drivers/net/ethernet/intel/igc/igc_i225.c

@@ -579,9 +579,8 @@ s32 igc_set_ltr_i225(struct igc_hw *hw, bool link)
 
 			/* Calculate tw_system (nsec). */
 			if (speed == SPEED_100) {
-				tw_system = ((rd32(IGC_EEE_SU) &
-					     IGC_TW_SYSTEM_100_MASK) >>
-					     IGC_TW_SYSTEM_100_SHIFT) * 500;
+				tw_system = FIELD_GET(IGC_TW_SYSTEM_100_MASK,
+						      rd32(IGC_EEE_SU)) * 500;
 			} else {
 				tw_system = (rd32(IGC_EEE_SU) &
 					     IGC_TW_SYSTEM_1000_MASK) * 500;

drivers/net/ethernet/intel/igc/igc_main.c

@@ -3712,8 +3712,7 @@ static int igc_enable_nfc_rule(struct igc_adapter *adapter,
 	}
 
 	if (rule->filter.match_flags & IGC_FILTER_FLAG_VLAN_TCI) {
-		int prio = (rule->filter.vlan_tci & VLAN_PRIO_MASK) >>
-			   VLAN_PRIO_SHIFT;
+		int prio = FIELD_GET(VLAN_PRIO_MASK, rule->filter.vlan_tci);
 
 		err = igc_add_vlan_prio_filter(adapter, prio, rule->action);
 		if (err)
@@ -3735,8 +3734,7 @@ static void igc_disable_nfc_rule(struct igc_adapter *adapter,
 		igc_del_etype_filter(adapter, rule->filter.etype);
 
 	if (rule->filter.match_flags & IGC_FILTER_FLAG_VLAN_TCI) {
-		int prio = (rule->filter.vlan_tci & VLAN_PRIO_MASK) >>
-			   VLAN_PRIO_SHIFT;
+		int prio = FIELD_GET(VLAN_PRIO_MASK, rule->filter.vlan_tci);
 
 		igc_del_vlan_prio_filter(adapter, prio);
 	}

drivers/net/ethernet/intel/igc/igc_phy.c

@@ -727,7 +727,7 @@ static s32 igc_write_xmdio_reg(struct igc_hw *hw, u16 addr,
  */
 s32 igc_write_phy_reg_gpy(struct igc_hw *hw, u32 offset, u16 data)
 {
-	u8 dev_addr = (offset & GPY_MMD_MASK) >> GPY_MMD_SHIFT;
+	u8 dev_addr = FIELD_GET(GPY_MMD_MASK, offset);
 	s32 ret_val;
 
 	offset = offset & GPY_REG_MASK;
@@ -758,7 +758,7 @@ s32 igc_write_phy_reg_gpy(struct igc_hw *hw, u32 offset, u16 data)
  */
 s32 igc_read_phy_reg_gpy(struct igc_hw *hw, u32 offset, u16 *data)
 {
-	u8 dev_addr = (offset & GPY_MMD_MASK) >> GPY_MMD_SHIFT;
+	u8 dev_addr = FIELD_GET(GPY_MMD_MASK, offset);
 	s32 ret_val;
 
 	offset = offset & GPY_REG_MASK;