ice: Add helper function ice_is_generic_mac

E800 series devices have a couple of quirks:
1. Sideband control queues are not supported
2. The registers that the driver needs to program for the "Precision
   Time Protocol (PTP)" feature are different for E800 series devices
   compared to other devices supported by this driver.

Both these require conditional logic based on the underlying device we
are dealing with.

The function ice_is_sbq_supported added by commit 8f5ee3c477
("ice: add support for sideband messages") addresses (1).
The same function can be used to address (2) as well
but this just looks weird readability wise in cases that have nothing
to do with sideband control queues:

	if (ice_is_sbq_supported(hw))
		/* program register A */
	else
		/* program register B */

For these cases, the function ice_is_generic_mac introduced by this
patch communicates the idea/intention better. Also rework
ice_is_sbq_supported to use this new function.
As side-band queue is supported for E825C devices, it's mac_type is
considered as generic mac_type.

Co-developed-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Signed-off-by: Grzegorz Nitka <grzegorz.nitka@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_common.c

@@ -169,6 +169,18 @@ static int ice_set_mac_type(struct ice_hw *hw)
 	return 0;
 }
 
+/**
+ * ice_is_generic_mac - check if device's mac_type is generic
+ * @hw: pointer to the hardware structure
+ *
+ * Return: true if mac_type is generic (with SBQ support), false if not
+ */
+bool ice_is_generic_mac(struct ice_hw *hw)
+{
+	return (hw->mac_type == ICE_MAC_GENERIC ||
+		hw->mac_type == ICE_MAC_GENERIC_3K_E825);
+}
+
 /**
  * ice_is_e810
  * @hw: pointer to the hardware structure

drivers/net/ethernet/intel/ice/ice_common.h

@@ -112,6 +112,7 @@ ice_update_phy_type(u64 *phy_type_low, u64 *phy_type_high,
 int
 ice_aq_manage_mac_write(struct ice_hw *hw, const u8 *mac_addr, u8 flags,
 			struct ice_sq_cd *cd);
+bool ice_is_generic_mac(struct ice_hw *hw);
 bool ice_is_e810(struct ice_hw *hw);
 int ice_clear_pf_cfg(struct ice_hw *hw);
 int

drivers/net/ethernet/intel/ice/ice_controlq.c

@@ -666,7 +666,7 @@ bool ice_is_sbq_supported(struct ice_hw *hw)
 	/* The device sideband queue is only supported on devices with the
 	 * generic MAC type.
 	 */
-	return hw->mac_type == ICE_MAC_GENERIC;
+	return ice_is_generic_mac(hw);
 }
 
 /**

drivers/net/ethernet/intel/ice/ice_main.c

@@ -1649,8 +1649,10 @@ static void ice_clean_sbq_subtask(struct ice_pf *pf)
 {
 	struct ice_hw *hw = &pf->hw;
 
-	/* Nothing to do here if sideband queue is not supported */
-	if (!ice_is_sbq_supported(hw)) {
+	/* if mac_type is not generic, sideband is not supported
+	 * and there's nothing to do here
+	 */
+	if (!ice_is_generic_mac(hw)) {
 		clear_bit(ICE_SIDEBANDQ_EVENT_PENDING, pf->state);
 		return;
 	}

drivers/net/ethernet/intel/ice/ice_type.h

@@ -132,6 +132,7 @@ enum ice_mac_type {
 	ICE_MAC_E810,
 	ICE_MAC_E830,
 	ICE_MAC_GENERIC,
+	ICE_MAC_GENERIC_3K_E825,
 };
 
 /* Media Types */