ice: clean up __ice_aq_get_set_rss_lut()

Refactor __ice_aq_get_set_rss_lut() to improve reader experience and limit
misuse scenarios (undesired LUT size for given LUT type).

Allow only 3 RSS LUT type+size variants:
PF LUT sized 2048, GLOBAL LUT sized 512, and VSI LUT sized 64, which were
used on default flows prior to this commit.

Prior to the change, code was mixing the meaning of @params->lut_size and
@params->lut_type, flag assigning logic was cryptic, while long defines
made everything harder to follow.

Fix that by extracting some code out to separate helpers.
Drop some of "shift by 0" statements that originated from Intel's
internal HW documentation.

Drop some redundant VSI masks (since ice_is_vsi_valid() gives "valid" for
up to 0x300 VSIs).

After sweeping all the defines out of struct ice_aqc_get_set_rss_lut,
it fits into 7 lines.

Finally apply some cleanup to the callsite
(use of the new enums, tmp var for lengthy bit extraction).

Note that flags for 128 and 64 sized VSI LUT are the same,
and 64 is used everywhere in the code (updated to new enum here), it just
happened that there was 128 in flag name.

__ice_aq_get_set_rss_key() uses the same VSI valid bit, make constant
common for it and __ice_aq_get_set_rss_lut().

Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Tested-by: Arpana Arland <arpanax.arland@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 25 insertions, 28 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
index 1ad92f95d6bd..29f7a9852aec 100644
--- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
@@ -1794,11 +1794,10 @@ struct ice_aqc_lldp_filter_ctrl {
 	u8 reserved2[12];
 };
 
+#define ICE_AQC_RSS_VSI_VALID BIT(15)
+
 /* Get/Set RSS key (indirect 0x0B04/0x0B02) */
 struct ice_aqc_get_set_rss_key {
-#define ICE_AQC_GSET_RSS_KEY_VSI_VALID	BIT(15)
-#define ICE_AQC_GSET_RSS_KEY_VSI_ID_S	0
-#define ICE_AQC_GSET_RSS_KEY_VSI_ID_M	(0x3FF << ICE_AQC_GSET_RSS_KEY_VSI_ID_S)
 	__le16 vsi_id;
 	u8 reserved[6];
 	__le32 addr_high;
@@ -1816,35 +1815,33 @@ struct ice_aqc_get_set_rss_keys {
 	u8 extended_hash_key[ICE_AQC_GET_SET_RSS_KEY_DATA_HASH_KEY_SIZE];
 };
 
-/* Get/Set RSS LUT (indirect 0x0B05/0x0B03) */
-struct ice_aqc_get_set_rss_lut {
-#define ICE_AQC_GSET_RSS_LUT_VSI_VALID	BIT(15)
-#define ICE_AQC_GSET_RSS_LUT_VSI_ID_S	0
-#define ICE_AQC_GSET_RSS_LUT_VSI_ID_M	(0x3FF << ICE_AQC_GSET_RSS_LUT_VSI_ID_S)
-	__le16 vsi_id;
-#define ICE_AQC_GSET_RSS_LUT_TABLE_TYPE_S	0
-#define ICE_AQC_GSET_RSS_LUT_TABLE_TYPE_M	\
-				(0x3 << ICE_AQC_GSET_RSS_LUT_TABLE_TYPE_S)
-
-#define ICE_AQC_GSET_RSS_LUT_TABLE_TYPE_VSI	 0
-#define ICE_AQC_GSET_RSS_LUT_TABLE_TYPE_PF	 1
-#define ICE_AQC_GSET_RSS_LUT_TABLE_TYPE_GLOBAL	 2
+enum ice_lut_type {
+	ICE_LUT_VSI = 0,
+	ICE_LUT_PF = 1,
+	ICE_LUT_GLOBAL = 2,
+};
 
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_S	 2
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_M	 \
-				(0x3 << ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_S)
+enum ice_lut_size {
+	ICE_LUT_VSI_SIZE = 64,
+	ICE_LUT_GLOBAL_SIZE = 512,
+	ICE_LUT_PF_SIZE = 2048,
+};
 
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_128	 128
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_128_FLAG 0
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_512	 512
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_512_FLAG 1
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_2K	 2048
-#define ICE_AQC_GSET_RSS_LUT_TABLE_SIZE_2K_FLAG	 2
+/* enum ice_aqc_lut_flags combines constants used to fill
+ * &ice_aqc_get_set_rss_lut ::flags, which is an amalgamation of global LUT ID,
+ * LUT size and LUT type, last of which does not need neither shift nor mask.
+ */
+enum ice_aqc_lut_flags {
+	ICE_AQC_LUT_SIZE_SMALL = 0, /* size = 64 or 128 */
+	ICE_AQC_LUT_SIZE_512 = BIT(2),
+	ICE_AQC_LUT_SIZE_2K = BIT(3),
 
-#define ICE_AQC_GSET_RSS_LUT_GLOBAL_IDX_S	 4
-#define ICE_AQC_GSET_RSS_LUT_GLOBAL_IDX_M	 \
-				(0xF << ICE_AQC_GSET_RSS_LUT_GLOBAL_IDX_S)
+	ICE_AQC_LUT_GLOBAL_IDX = GENMASK(7, 4),
+};
 
+/* Get/Set RSS LUT (indirect 0x0B05/0x0B03) */
+struct ice_aqc_get_set_rss_lut {
+	__le16 vsi_id;
 	__le16 flags;
 	__le32 reserved;
 	__le32 addr_high;