feature: packet IO support IP reassembly

infra/session_manager/session_pool.c

@@ -1,3 +1,4 @@
+#include <assert.h>
 #include <stdlib.h>
 
 #include "session_internal.h"
@@ -6,8 +7,9 @@
 struct session_pool
 {
     uint64_t capacity;
-    uint64_t available;
-    struct session_list free_list;
+    uint64_t used;
+    uint64_t free;
+    struct session_queue free_list;
 };
 
 struct session_pool *session_pool_new(uint64_t capacity)
@@ -17,7 +19,8 @@ struct session_pool *session_pool_new(uint64_t capacity)
     {
         return NULL;
     }
-    pool->available = 0;
+    pool->used = 0;
+    pool->free = 0;
     pool->capacity = capacity;
     TAILQ_INIT(&pool->free_list);
 
@@ -26,7 +29,7 @@ struct session_pool *session_pool_new(uint64_t capacity)
     {
         struct session *sess = &array[i];
         TAILQ_INSERT_TAIL(&pool->free_list, sess, free_tqe);
-        pool->available++;
+        pool->free++;
     }
 
     return pool;
@@ -40,8 +43,10 @@ void session_pool_free(struct session_pool *pool)
         while ((sess = TAILQ_FIRST(&pool->free_list)))
         {
             TAILQ_REMOVE(&pool->free_list, sess, free_tqe);
-            pool->available--;
+            pool->free--;
         }
+        assert(pool->free == 0);
+        assert(pool->used == 0);
 
         free(pool);
         pool = NULL;
@@ -59,7 +64,8 @@ struct session *session_pool_pop(struct session_pool *pool)
     if (sess)
     {
         TAILQ_REMOVE(&pool->free_list, sess, free_tqe);
-        pool->available--;
+        pool->free--;
+        pool->used++;
     }
 
     return sess;
@@ -73,7 +79,8 @@ void session_pool_push(struct session_pool *pool, struct session *sess)
     }
 
     TAILQ_INSERT_TAIL(&pool->free_list, sess, free_tqe);
-    pool->available++;
+    pool->free++;
+    pool->used--;
 }
 
 const struct session *session_pool_get0(const struct session_pool *pool, uint64_t idx)
@@ -87,22 +94,12 @@ const struct session *session_pool_get0(const struct session_pool *pool, uint64_
     return &array[idx];
 }
 
-uint64_t session_pool_available_num(const struct session_pool *pool)
+uint64_t session_pool_get_free_num(const struct session_pool *pool)
 {
-    if (pool == NULL)
-    {
-        return 0;
-    }
-
-    return pool->available;
+    return pool->free;
 }
 
-uint64_t session_pool_capacity_size(const struct session_pool *pool)
+uint64_t session_pool_get_used_num(const struct session_pool *pool)
 {
-    if (pool == NULL)
-    {
-        return 0;
-    }
-
-    return pool->capacity;
+    return pool->used;
 }