[dpdk-dev] [PATCH 12/20] net/ice/base: add helper function for boost TCAM match

[Qi Zhang <qi.z.zhang@intel.com>]

Add internal helper function ice_bst_tcam_match to perform ternary
match on boost TCAM.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
---
 drivers/net/ice/base/ice_bst_tcam.c | 22 +++++++++++++++
 drivers/net/ice/base/ice_bst_tcam.h |  3 ++
 drivers/net/ice/base/ice_parser.h   |  1 +
 drivers/net/ice/base/ice_tmatch.h   | 44 +++++++++++++++++++++++++++++
 4 files changed, 70 insertions(+)
 create mode 100644 drivers/net/ice/base/ice_tmatch.h

diff --git a/drivers/net/ice/base/ice_bst_tcam.c b/drivers/net/ice/base/ice_bst_tcam.c
index 1c82359681..76b3a5c551 100644
--- a/drivers/net/ice/base/ice_bst_tcam.c
+++ b/drivers/net/ice/base/ice_bst_tcam.c
@@ -239,3 +239,25 @@ struct ice_lbl_item *ice_bst_lbl_table_get(struct ice_hw *hw)
 					ice_parser_sect_item_get,
 					_parse_lbl_item, true);
 }
+
+/**
+ * ice_bst_tcam_match - match a pattern on the boost tcam table
+ * @tcam_table: boost tcam table to search
+ * @pat: pattern to match
+ */
+struct ice_bst_tcam_item *
+ice_bst_tcam_match(struct ice_bst_tcam_item *tcam_table, u8 *pat)
+{
+	int i;
+
+	for (i = 0; i < ICE_BST_TCAM_TABLE_SIZE; i++) {
+		struct ice_bst_tcam_item *item = &tcam_table[i];
+
+		if (item->hit_idx_grp == 0)
+			continue;
+		if (ice_ternary_match(item->key, item->key_inv, pat, 20))
+			return item;
+	}
+
+	return NULL;
+}
diff --git a/drivers/net/ice/base/ice_bst_tcam.h b/drivers/net/ice/base/ice_bst_tcam.h
index a4ab40721f..3cba0bbf55 100644
--- a/drivers/net/ice/base/ice_bst_tcam.h
+++ b/drivers/net/ice/base/ice_bst_tcam.h
@@ -25,4 +25,7 @@ void ice_bst_tcam_dump(struct ice_hw *hw, struct ice_bst_tcam_item *item);
 struct ice_bst_tcam_item *ice_bst_tcam_table_get(struct ice_hw *hw);
 
 struct ice_lbl_item *ice_bst_lbl_table_get(struct ice_hw *hw);
+
+struct ice_bst_tcam_item *
+ice_bst_tcam_match(struct ice_bst_tcam_item *tcam_table, u8 *pat);
 #endif /*_ICE_BST_TCAM_H_ */
diff --git a/drivers/net/ice/base/ice_parser.h b/drivers/net/ice/base/ice_parser.h
index 3a307e0344..b2ab21728e 100644
--- a/drivers/net/ice/base/ice_parser.h
+++ b/drivers/net/ice/base/ice_parser.h
@@ -15,6 +15,7 @@
 #include "ice_flg_rd.h"
 #include "ice_xlt_kb.h"
 #include "ice_parser_rt.h"
+#include "ice_tmatch.h"
 
 struct ice_parser {
 	struct ice_hw *hw; /* pointer to the hardware structure */
diff --git a/drivers/net/ice/base/ice_tmatch.h b/drivers/net/ice/base/ice_tmatch.h
new file mode 100644
index 0000000000..178a084639
--- /dev/null
+++ b/drivers/net/ice/base/ice_tmatch.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2001-2021 Intel Corporation
+ */
+
+#ifndef _ICE_TMATCH_H_
+#define _ICE_TMATCH_H_
+
+static inline
+bool ice_ternary_match_byte(u8 key, u8 key_inv, u8 pat)
+{
+	u8 k1, k2, v;
+	int i;
+
+	for (i = 0; i < 8; i++) {
+		k1 = (u8)(key & (1 << i));
+		k2 = (u8)(key_inv & (1 << i));
+		v = (u8)(pat & (1 << i));
+
+		if (k1 != 0 && k2 != 0)
+			continue;
+		if (k1 == 0 && k2 == 0)
+			return false;
+
+		if (k1 == v)
+			return false;
+	}
+
+	return true;
+}
+
+static inline
+bool ice_ternary_match(const u8 *key, const u8 *key_inv,
+		       const u8 *pat, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		if (!ice_ternary_match_byte(key[i], key_inv[i], pat[i]))
+			return false;
+
+	return true;
+}
+
+#endif /* _ICE_TMATCH_H_ */
-- 
2.26.2