[v3] lib/hash: add defer queue reclaim API
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Commit Message
This patch adds a new feature to the hash library to allow the user to
reclaim the defer queue. This is useful when the user wants to force
reclaim resources that are not being used. This API is only available
if the RCU is enabled.
Signed-off-by: Abdullah Ömer Yamaç <aomeryamac@gmail.com>
---
lib/hash/rte_cuckoo_hash.c | 23 +++++++++++++++++++++++
lib/hash/rte_hash.h | 28 +++++++++++++++++++++++++++-
lib/hash/version.map | 6 ++++++
3 files changed, 56 insertions(+), 1 deletion(-)
@@ -1588,6 +1588,29 @@ rte_hash_rcu_qsbr_add(struct rte_hash *h, struct rte_hash_rcu_config *cfg)
return 0;
}
+int
+rte_hash_rcu_qsbr_dq_reclaim(struct rte_hash *h, unsigned int *freed,
+ unsigned int *pending, unsigned int *available)
+{
+ int ret;
+
+ if (h->hash_rcu_cfg == NULL) {
+ rte_errno = EINVAL;
+ return -1;
+ }
+
+ ret = rte_rcu_qsbr_dq_reclaim(h->dq, h->hash_rcu_cfg->max_reclaim_size,
+ freed, pending, available);
+ if (ret != 0) {
+ HASH_LOG(ERR,
+ "%s: could not reclaim the defer queue in hash table",
+ __func__);
+ return -1;
+ }
+
+ return 0;
+}
+
static inline void
remove_entry(const struct rte_hash *h, struct rte_hash_bucket *bkt,
unsigned int i)
@@ -631,7 +631,7 @@ rte_hash_lookup_with_hash_bulk_data(const struct rte_hash *h,
*/
int
rte_hash_lookup_bulk(const struct rte_hash *h, const void **keys,
- uint32_t num_keys, int32_t *positions);
+ uint32_t num_keys, int32_t *positions);
/**
* Iterate through the hash table, returning key-value pairs.
@@ -674,6 +674,32 @@ rte_hash_iterate(const struct rte_hash *h, const void **key, void **data, uint32
*/
int rte_hash_rcu_qsbr_add(struct rte_hash *h, struct rte_hash_rcu_config *cfg);
+/**
+ * Reclaim resources from the defer queue.
+ * This API reclaim the resources from the defer queue if rcu is enabled.
+ *
+ * @param h
+ * The hash object to reclaim resources.
+ * @param n
+ * Maximum number of resources to free.
+ * @param freed
+ * Number of resources that were freed.
+ * @param pending
+ * Number of resources pending on the defer queue.
+ * This number might not be accurate if multi-thread safety is configured.
+ * @param available
+ * Number of resources that can be added to the defer queue.
+ * This number might not be accurate if multi-thread safety is configured.
+ * @return
+ * On success - 0
+ * On error - 1 with error code set in rte_errno.
+ * Possible rte_errno codes are:
+ * - EINVAL - invalid pointer
+ */
+__rte_experimental
+int rte_hash_rcu_qsbr_dq_reclaim(struct rte_hash *h, unsigned int *freed,
+ unsigned int *pending, unsigned int *available);
+
#ifdef __cplusplus
}
#endif
@@ -48,3 +48,9 @@ DPDK_24 {
local: *;
};
+
+EXPERIMENTAL {
+ global:
+
+ rte_hash_rcu_qsbr_dq_reclaim;
+};
\ No newline at end of file