fib6: add lookup runtime selection

Add type argument to trie_get_lookup_fn()
Now it only supports RTE_FIB6_LOOKUP_TRIE_SCALAR

Add new rte_fib6_select_lookup() - user can change lookup
function type runtime.

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

lib/librte_fib/rte_fib6.c

@@ -107,7 +107,7 @@ init_dataplane(struct rte_fib6 *fib, __rte_unused int socket_id,
 		fib->dp = trie_create(dp_name, socket_id, conf);
 		if (fib->dp == NULL)
 			return -rte_errno;
-		fib->lookup = rte_trie_get_lookup_fn(conf);
+		fib->lookup = trie_get_lookup_fn(fib->dp, RTE_FIB6_LOOKUP_TRIE_SCALAR);
 		fib->modify = trie_modify;
 		return 0;
 	default:
@@ -319,3 +319,21 @@ rte_fib6_get_rib(struct rte_fib6 *fib)
 {
 	return (fib == NULL) ? NULL : fib->rib;
 }
+
+int
+rte_fib6_select_lookup(struct rte_fib6 *fib,
+	enum rte_fib6_lookup_type type)
+{
+	rte_fib6_lookup_fn_t fn;
+
+	switch (fib->type) {
+	case RTE_FIB6_TRIE:
+		fn = trie_get_lookup_fn(fib->dp, type);
+		if (fn == NULL)
+			return -EINVAL;
+		fib->lookup = fn;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}

lib/librte_fib/rte_fib6.h

@@ -52,12 +52,18 @@ enum rte_fib6_op {
 	RTE_FIB6_DEL,
 };
 
+/** Size of nexthop (1 << nh_sz) bits for TRIE based FIB */
 enum rte_fib_trie_nh_sz {
 	RTE_FIB6_TRIE_2B = 1,
 	RTE_FIB6_TRIE_4B,
 	RTE_FIB6_TRIE_8B
 };
 
+/** Type of lookup function implementation */
+enum rte_fib6_lookup_type {
+	RTE_FIB6_LOOKUP_TRIE_SCALAR /**< Scalar lookup function implementation*/
+};
+
 /** FIB configuration structure */
 struct rte_fib6_conf {
 	enum rte_fib6_type type; /**< Type of FIB struct */
@@ -200,6 +206,22 @@ __rte_experimental
 struct rte_rib6 *
 rte_fib6_get_rib(struct rte_fib6 *fib);
 
+/**
+ * Set lookup function based on type
+ *
+ * @param fib
+ *   FIB object handle
+ * @param type
+ *   type of lookup function
+ *
+ * @return
+ *   0 on success
+ *   -EINVAL on failure
+ */
+__rte_experimental
+int
+rte_fib6_select_lookup(struct rte_fib6 *fib, enum rte_fib6_lookup_type type);
+
 #ifdef __cplusplus
 }
 #endif

lib/librte_fib/trie.c

@@ -59,13 +59,6 @@ enum edge {
 	REDGE
 };
 
-enum lookup_type {
-	MACRO,
-	INLINE,
-	UNI
-};
-static enum lookup_type test_lookup = MACRO;
-
 static inline uint32_t
 get_tbl24_idx(const uint8_t *ip)
 {
@@ -153,22 +146,38 @@ LOOKUP_FUNC(2b, uint16_t, 1)
 LOOKUP_FUNC(4b, uint32_t, 2)
 LOOKUP_FUNC(8b, uint64_t, 3)
 
-rte_fib6_lookup_fn_t
-rte_trie_get_lookup_fn(struct rte_fib6_conf *conf)
+static inline rte_fib6_lookup_fn_t
+get_scalar_fn(enum rte_fib_trie_nh_sz nh_sz)
 {
-	enum rte_fib_trie_nh_sz nh_sz = conf->trie.nh_sz;
-
-	if (test_lookup == MACRO) {
-		switch (nh_sz) {
-		case RTE_FIB6_TRIE_2B:
-			return rte_trie_lookup_bulk_2b;
-		case RTE_FIB6_TRIE_4B:
-			return rte_trie_lookup_bulk_4b;
-		case RTE_FIB6_TRIE_8B:
-			return rte_trie_lookup_bulk_8b;
-		}
+	switch (nh_sz) {
+	case RTE_FIB6_TRIE_2B:
+		return rte_trie_lookup_bulk_2b;
+	case RTE_FIB6_TRIE_4B:
+		return rte_trie_lookup_bulk_4b;
+	case RTE_FIB6_TRIE_8B:
+		return rte_trie_lookup_bulk_8b;
+	default:
+		return NULL;
 	}
+}
 
+rte_fib6_lookup_fn_t
+trie_get_lookup_fn(void *p, enum rte_fib6_lookup_type type)
+{
+	enum rte_fib_trie_nh_sz nh_sz;
+	struct rte_trie_tbl *dp = p;
+
+	if (dp == NULL)
+		return NULL;
+
+	nh_sz = dp->nh_sz;
+
+	switch (type) {
+	case RTE_FIB6_LOOKUP_TRIE_SCALAR:
+		return get_scalar_fn(nh_sz);
+	default:
+		return NULL;
+	}
 	return NULL;
 }
 

lib/librte_fib/trie.h

@@ -22,7 +22,7 @@ void
 trie_free(void *p);
 
 rte_fib6_lookup_fn_t
-rte_trie_get_lookup_fn(struct rte_fib6_conf *fib_conf);
+trie_get_lookup_fn(void *p, enum rte_fib6_lookup_type type);
 
 int
 trie_modify(struct rte_fib6 *fib, const uint8_t ip[RTE_FIB6_IPV6_ADDR_SIZE],

lib/librte_fib/version.map

@@ -19,6 +19,7 @@ EXPERIMENTAL {
 	rte_fib6_lookup_bulk;
 	rte_fib6_get_dp;
 	rte_fib6_get_rib;
+	rte_fib6_select_lookup;
 
 	local: *;
 };