Give user a chance to customize the hash key compare function.
The default rte_hash_cmp_eq function is set in the rte_hash_create
function, but these builtin ones may not be good enough, so the user
may call this to override the default one.
Signed-off-by: Yu Nemo Wenbin <yuwb_bjy at ctbri.com.cn>
---
lib/librte_hash/rte_cuckoo_hash.c | 7 +++++--
lib/librte_hash/rte_hash.h | 15 +++++++++++++++
lib/librte_hash/rte_hash_version.map | 7 +++++++
3 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/lib/librte_hash/rte_cuckoo_hash.c
b/lib/librte_hash/rte_cuckoo_hash.c
index 88f77c3..2ccb81c 100644
--- a/lib/librte_hash/rte_cuckoo_hash.c
+++ b/lib/librte_hash/rte_cuckoo_hash.c
@@ -102,8 +102,6 @@ EAL_REGISTER_TAILQ(rte_hash_tailq)
#define LCORE_CACHE_SIZE 8
-typedef int (*rte_hash_cmp_eq_t)(const void *key1, const void *key2, size_t
key_len);
-
struct lcore_cache {
unsigned len; /**< Cache len */
void *objs[LCORE_CACHE_SIZE]; /**< Cache objects */
@@ -187,6 +185,11 @@ rte_hash_find_existing(const char *name)
return h;
}
+void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func)
+{
+ h->rte_hash_cmp_eq = func;
+}
+
struct rte_hash *
rte_hash_create(const struct rte_hash_parameters *params)
{
diff --git a/lib/librte_hash/rte_hash.h b/lib/librte_hash/rte_hash.h
index b678766..dfca5ef 100644
--- a/lib/librte_hash/rte_hash.h
+++ b/lib/librte_hash/rte_hash.h
@@ -66,6 +66,9 @@ typedef uint32_t hash_sig_t;
typedef uint32_t (*rte_hash_function)(const void *key, uint32_t key_len,
uint32_t init_val);
+/** Type of function used to compare the hash key. */
+typedef int (*rte_hash_cmp_eq_t)(const void *key1, const void *key2, size_t
key_len);
+
/**
* Parameters used when creating the hash table.
*/
@@ -104,6 +107,18 @@ struct rte_hash *
rte_hash_create(const struct rte_hash_parameters *params);
/**
+ * Set the rte_hash_set_cmp_func.
+ * Set a new hash compare function other than the default one.
+ *
+ * @note Function pointer does not work with multi-process, so don't use it
+ * in multi-process mode.
+ *
+ * @param h
+ * Hash table to reset
+ */
+void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func);
+
+/**
* Find an existing hash table object and return a pointer to it.
*
* @param name
diff --git a/lib/librte_hash/rte_hash_version.map
b/lib/librte_hash/rte_hash_version.map
index 906c8ad..1aa94f9 100644
--- a/lib/librte_hash/rte_hash_version.map
+++ b/lib/librte_hash/rte_hash_version.map
@@ -32,3 +32,10 @@ DPDK_2.1 {
rte_hash_reset;
} DPDK_2.0;
+
+DPDK_2.2 {
+ global:
+
+ rte_hash_set_cmp_func;
+
+} DPDK_2.1;
--
1.9.1
