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<base href="https://bugs.dpdk.org/">
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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - rte_mempool_avail_count : returns bigger than mempool size"
href="https://bugs.dpdk.org/show_bug.cgi?id=1229">1229</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>rte_mempool_avail_count : returns bigger than mempool size
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>22.11
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>minor
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>core
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yasinncaner@gmail.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">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;
}
</pre>
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