ice: refactor the FD and RSS flow ID generation

The flow director and RSS blocks use separate methods to generate a
unique 64 bit ID for the flow. This is not extendable, especially for
the RSS that already uses all 64 bit space.

Refactor the flow generation API so that the ID is generated within
ice_flow_add_prof(). The FD and RSS blocks caches the generated ID for
later use.

Suggested-by: Dan Nowlin <dan.nowlin@intel.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Link: https://lore.kernel.org/r/20231213003321.605376-7-ahmed.zaki@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 13 insertions, 34 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_flow.c b/drivers/net/ethernet/intel/ice/ice_flow.c
index c34be72f99b3..0e2510d7535b 100644
--- a/drivers/net/ethernet/intel/ice/ice_flow.c
+++ b/drivers/net/ethernet/intel/ice/ice_flow.c
@@ -1328,7 +1328,6 @@ ice_flow_rem_entry_sync(struct ice_hw *hw, enum ice_block __always_unused blk,
  * @hw: pointer to the HW struct
  * @blk: classification stage
  * @dir: flow direction
- * @prof_id: unique ID to identify this flow profile
  * @segs: array of one or more packet segments that describe the flow
  * @segs_cnt: number of packet segments provided
  * @prof: stores the returned flow profile added
@@ -1337,17 +1336,24 @@ ice_flow_rem_entry_sync(struct ice_hw *hw, enum ice_block __always_unused blk,
  */
 static int
 ice_flow_add_prof_sync(struct ice_hw *hw, enum ice_block blk,
-		       enum ice_flow_dir dir, u64 prof_id,
+		       enum ice_flow_dir dir,
 		       struct ice_flow_seg_info *segs, u8 segs_cnt,
 		       struct ice_flow_prof **prof)
 {
 	struct ice_flow_prof_params *params;
+	struct ice_prof_id *ids;
 	int status;
+	u64 prof_id;
 	u8 i;
 
 	if (!prof)
 		return -EINVAL;
 
+	ids = &hw->blk[blk].prof_id;
+	prof_id = find_first_zero_bit(ids->id, ids->count);
+	if (prof_id >= ids->count)
+		return -ENOSPC;
+
 	params = kzalloc(sizeof(*params), GFP_KERNEL);
 	if (!params)
 		return -ENOMEM;
@@ -1393,6 +1399,7 @@ ice_flow_add_prof_sync(struct ice_hw *hw, enum ice_block blk,
 
 	INIT_LIST_HEAD(&params->prof->entries);
 	mutex_init(&params->prof->entries_lock);
+	set_bit(prof_id, ids->id);
 	*prof = params->prof;
 
 out:
@@ -1436,6 +1443,7 @@ ice_flow_rem_prof_sync(struct ice_hw *hw, enum ice_block blk,
 	/* Remove all hardware profiles associated with this flow profile */
 	status = ice_rem_prof(hw, blk, prof->id);
 	if (!status) {
+		clear_bit(prof->id, hw->blk[blk].prof_id.id);
 		list_del(&prof->l_entry);
 		mutex_destroy(&prof->entries_lock);
 		devm_kfree(ice_hw_to_dev(hw), prof);
@@ -1511,14 +1519,13 @@ ice_flow_disassoc_prof(struct ice_hw *hw, enum ice_block blk,
  * @hw: pointer to the HW struct
  * @blk: classification stage
  * @dir: flow direction
- * @prof_id: unique ID to identify this flow profile
  * @segs: array of one or more packet segments that describe the flow
  * @segs_cnt: number of packet segments provided
  * @prof: stores the returned flow profile added
  */
 int
 ice_flow_add_prof(struct ice_hw *hw, enum ice_block blk, enum ice_flow_dir dir,
-		  u64 prof_id, struct ice_flow_seg_info *segs, u8 segs_cnt,
+		  struct ice_flow_seg_info *segs, u8 segs_cnt,
 		  struct ice_flow_prof **prof)
 {
 	int status;
@@ -1538,8 +1545,7 @@ ice_flow_add_prof(struct ice_hw *hw, enum ice_block blk, enum ice_flow_dir dir,
 
 	mutex_lock(&hw->fl_profs_locks[blk]);
 
-	status = ice_flow_add_prof_sync(hw, blk, dir, prof_id, segs, segs_cnt,
-					prof);
+	status = ice_flow_add_prof_sync(hw, blk, dir, segs, segs_cnt, prof);
 	if (!status)
 		list_add(&(*prof)->l_entry, &hw->fl_profs[blk]);
 
@@ -2066,28 +2072,6 @@ ice_add_rss_list(struct ice_hw *hw, u16 vsi_handle, struct ice_flow_prof *prof)
 	return 0;
 }
 
-#define ICE_FLOW_PROF_HASH_S	0
-#define ICE_FLOW_PROF_HASH_M	GENMASK_ULL(31, 0)
-#define ICE_FLOW_PROF_HDR_S	32
-#define ICE_FLOW_PROF_HDR_M	GENMASK_ULL(61, 32)
-#define ICE_FLOW_PROF_ENCAP_S	62
-#define ICE_FLOW_PROF_ENCAP_M	GENMASK_ULL(63, 62)
-
-/* Flow profile ID format:
- * [0:31] - Packet match fields
- * [32:61] - Protocol header
- * [62:63] - Encapsulation flag:
- *	     0 if non-tunneled
- *	     1 if tunneled
- *	     2 for tunneled with outer ipv4
- *	     3 for tunneled with outer ipv6
- */
-#define ICE_FLOW_GEN_PROFID(hash, hdr, encap)                                \
-	((u64)(((u64)(hash) & ICE_FLOW_PROF_HASH_M) |                        \
-	       (((u64)(hdr) << ICE_FLOW_PROF_HDR_S) & ICE_FLOW_PROF_HDR_M) | \
-	       (((u64)(encap) << ICE_FLOW_PROF_ENCAP_S) &                    \
-		ICE_FLOW_PROF_ENCAP_M)))
-
 /**
  * ice_add_rss_cfg_sync - add an RSS configuration
  * @hw: pointer to the hardware structure
@@ -2165,13 +2149,8 @@ ice_add_rss_cfg_sync(struct ice_hw *hw, u16 vsi_handle,
 		goto exit;
 	}
 
-	/* Create a new flow profile with generated profile and packet
-	 * segment information.
-	 */
+	/* Create a new flow profile with packet segment information. */
 	status = ice_flow_add_prof(hw, blk, ICE_FLOW_RX,
-				   ICE_FLOW_GEN_PROFID(cfg->hash_flds,
-						       segs[segs_cnt - 1].hdrs,
-						       cfg->hdr_type),
 				   segs, segs_cnt, &prof);
 	if (status)
 		goto exit;