[Bug 1229] rte_mempool_avail_count : returns bigger than mempool size

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1229

            Bug ID: 1229
           Summary: rte_mempool_avail_count : returns bigger than mempool
                    size
           Product: DPDK
           Version: 22.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: core
          Assignee: dev at dpdk.org
          Reporter: yasinncaner at gmail.com
  Target Milestone: ---

Hello,

Sometimes rte_mempool_avail_count function returns bigger than mempool size
that cause mis-calculation/overflow/negative of in-use count  (
rte_mempool_in_use_count)


11:51:48 NOTI [UseCount_mpool:00000065][avail_mpool:00010334]
11:51:48 NOTI [UseCount_mpool:4294967135][avail_mpool:00010560]


After adding a condition, it is fixed.

/* Return the number of entries in the mempool */
unsigned int
rte_mempool_avail_count(const struct rte_mempool *mp)
{
        unsigned count;
        unsigned lcore_id;

        count = rte_mempool_ops_get_count(mp);

        if (mp->cache_size == 0){
                if (count > mp->size){
                        return mp->size;
                }
                return count;
        }
        for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++)
                count += mp->local_cache[lcore_id].len;

        /*
         * due to race condition (access to len is not locked), the
         * total can be greater than size... so fix the result
         */
        if (count > mp->size){
                return mp->size;
        }
        return count;
}

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