[dpdk-dev] [PATCH v5 2/8] fib: make lookup function type configurable

[Vladimir Medvedkin <vladimir.medvedkin@intel.com>]

Add type argument to dir24_8_get_lookup_fn()
Now it supports 3 different lookup implementations:
 RTE_FIB_DIR24_8_SCALAR_MACRO
 RTE_FIB_DIR24_8_SCALAR_INLINE
 RTE_FIB_DIR24_8_SCALAR_UNI

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

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
---
 lib/librte_fib/dir24_8.c           | 32 +++++++++++++++++++-----------
 lib/librte_fib/dir24_8.h           |  2 +-
 lib/librte_fib/rte_fib.c           | 21 +++++++++++++++++++-
 lib/librte_fib/rte_fib.h           | 23 +++++++++++++++++++++
 lib/librte_fib/rte_fib_version.map |  1 +
 5 files changed, 65 insertions(+), 14 deletions(-)

diff --git a/lib/librte_fib/dir24_8.c b/lib/librte_fib/dir24_8.c
index c9dce3cbc..825d061fd 100644
--- a/lib/librte_fib/dir24_8.c
+++ b/lib/librte_fib/dir24_8.c
@@ -45,13 +45,6 @@ struct dir24_8_tbl {
 
 #define ROUNDUP(x, y)	 RTE_ALIGN_CEIL(x, (1 << (32 - y)))
 
-enum lookup_type {
-	MACRO,
-	INLINE,
-	UNI
-};
-enum lookup_type test_lookup = MACRO;
-
 static inline void *
 get_tbl24_p(struct dir24_8_tbl *dp, uint32_t ip, uint8_t nh_sz)
 {
@@ -253,11 +246,18 @@ dir24_8_lookup_bulk_uni(void *p, const uint32_t *ips,
 }
 
 rte_fib_lookup_fn_t
-dir24_8_get_lookup_fn(struct rte_fib_conf *fib_conf)
+dir24_8_get_lookup_fn(void *p, enum rte_fib_dir24_8_lookup_type type)
 {
-	enum rte_fib_dir24_8_nh_sz nh_sz = fib_conf->dir24_8.nh_sz;
+	enum rte_fib_dir24_8_nh_sz nh_sz;
+	struct dir24_8_tbl *dp = p;
 
-	if (test_lookup == MACRO) {
+	if (dp == NULL)
+		return NULL;
+
+	nh_sz = dp->nh_sz;
+
+	switch (type) {
+	case RTE_FIB_DIR24_8_SCALAR_MACRO:
 		switch (nh_sz) {
 		case RTE_FIB_DIR24_8_1B:
 			return dir24_8_lookup_bulk_1b;
@@ -267,8 +267,10 @@ dir24_8_get_lookup_fn(struct rte_fib_conf *fib_conf)
 			return dir24_8_lookup_bulk_4b;
 		case RTE_FIB_DIR24_8_8B:
 			return dir24_8_lookup_bulk_8b;
+		default:
+			return NULL;
 		}
-	} else if (test_lookup == INLINE) {
+	case RTE_FIB_DIR24_8_SCALAR_INLINE:
 		switch (nh_sz) {
 		case RTE_FIB_DIR24_8_1B:
 			return dir24_8_lookup_bulk_0;
@@ -278,9 +280,15 @@ dir24_8_get_lookup_fn(struct rte_fib_conf *fib_conf)
 			return dir24_8_lookup_bulk_2;
 		case RTE_FIB_DIR24_8_8B:
 			return dir24_8_lookup_bulk_3;
+		default:
+			return NULL;
 		}
-	} else
+	case RTE_FIB_DIR24_8_SCALAR_UNI:
 		return dir24_8_lookup_bulk_uni;
+	default:
+		return NULL;
+	}
+
 	return NULL;
 }
 
diff --git a/lib/librte_fib/dir24_8.h b/lib/librte_fib/dir24_8.h
index 1ec437c0c..53c5dd29e 100644
--- a/lib/librte_fib/dir24_8.h
+++ b/lib/librte_fib/dir24_8.h
@@ -22,7 +22,7 @@ void
 dir24_8_free(void *p);
 
 rte_fib_lookup_fn_t
-dir24_8_get_lookup_fn(struct rte_fib_conf *conf);
+dir24_8_get_lookup_fn(void *p, enum rte_fib_dir24_8_lookup_type type);
 
 int
 dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
diff --git a/lib/librte_fib/rte_fib.c b/lib/librte_fib/rte_fib.c
index e0908084f..b9f6efbb1 100644
--- a/lib/librte_fib/rte_fib.c
+++ b/lib/librte_fib/rte_fib.c
@@ -107,7 +107,8 @@ init_dataplane(struct rte_fib *fib, __rte_unused int socket_id,
 		fib->dp = dir24_8_create(dp_name, socket_id, conf);
 		if (fib->dp == NULL)
 			return -rte_errno;
-		fib->lookup = dir24_8_get_lookup_fn(conf);
+		fib->lookup = dir24_8_get_lookup_fn(fib->dp,
+			RTE_FIB_DIR24_8_SCALAR_MACRO);
 		fib->modify = dir24_8_modify;
 		return 0;
 	default:
@@ -317,3 +318,21 @@ rte_fib_get_rib(struct rte_fib *fib)
 {
 	return (fib == NULL) ? NULL : fib->rib;
 }
+
+int
+rte_fib_set_lookup_fn(struct rte_fib *fib,
+	enum rte_fib_dir24_8_lookup_type type)
+{
+	rte_fib_lookup_fn_t fn;
+
+	switch (fib->type) {
+	case RTE_FIB_DIR24_8:
+		fn = dir24_8_get_lookup_fn(fib->dp, type);
+		if (fn == NULL)
+			return -EINVAL;
+		fib->lookup = fn;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
diff --git a/lib/librte_fib/rte_fib.h b/lib/librte_fib/rte_fib.h
index 84ee774d2..892898c6f 100644
--- a/lib/librte_fib/rte_fib.h
+++ b/lib/librte_fib/rte_fib.h
@@ -58,6 +58,12 @@ enum rte_fib_dir24_8_nh_sz {
 	RTE_FIB_DIR24_8_8B
 };
 
+enum rte_fib_dir24_8_lookup_type {
+	RTE_FIB_DIR24_8_SCALAR_MACRO,
+	RTE_FIB_DIR24_8_SCALAR_INLINE,
+	RTE_FIB_DIR24_8_SCALAR_UNI
+};
+
 /** FIB configuration structure */
 struct rte_fib_conf {
 	enum rte_fib_type type; /**< Type of FIB struct */
@@ -196,6 +202,23 @@ __rte_experimental
 struct rte_rib *
 rte_fib_get_rib(struct rte_fib *fib);
 
+/**
+ * Set lookup function based on type
+ *
+ * @param fib
+ *   FIB object handle
+ * @param type
+ *   type of lookup function
+ *
+ * @return
+ *    -EINVAL on failure
+ *    0 on success
+ */
+__rte_experimental
+int
+rte_fib_set_lookup_fn(struct rte_fib *fib,
+	enum rte_fib_dir24_8_lookup_type type);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_fib/rte_fib_version.map b/lib/librte_fib/rte_fib_version.map
index 9527417d2..216af66b3 100644
--- a/lib/librte_fib/rte_fib_version.map
+++ b/lib/librte_fib/rte_fib_version.map
@@ -9,6 +9,7 @@ EXPERIMENTAL {
 	rte_fib_lookup_bulk;
 	rte_fib_get_dp;
 	rte_fib_get_rib;
+	rte_fib_set_lookup_fn;
 
 	rte_fib6_add;
 	rte_fib6_create;
-- 
2.17.1