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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">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - drivers/common/mlx5: mlx5_malloc() called on invalid socket ID when global MR cache is full and rte_extmem_* API is used"
href="https://bugs.dpdk.org/show_bug.cgi?id=1256">1256</a>
</td>
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<tr>
<th>Summary</th>
<td>drivers/common/mlx5: mlx5_malloc() called on invalid socket ID when global MR cache is full and rte_extmem_* API is used
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>21.11
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>other
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>baciumariuscristian@yahoo.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">Overview:
Attempt to allocate a new mlx5 MR entry when global Btree cache is full ends up
calling mlx5_malloc with the EXTERNAL_HEAP_MIN_SOCKET_ID socket ID, given that
no external-memory heap has been created. Instead the rte_extmem_* API is used.
Steps to reproduce:
- start a primary DPDK process, on a NIC compatible with mlx5_core driver;
- use rte_extmem_register() to register >512 pages of 4KB;
- use rte_dev_dma_map() to dma-map each page;
- rte_eth_tx_burst() an mbuf with an external buffer from the last page of the
registered memory (or a page above index 512). (a virtual address that will not
be found in the global Btree cache);
Actual results:
mlx5_malloc in mlx5_mr_create_primary() fails with "Unable to allocate memory
for a new MR". From this point forward, packets never reach the other end.
Expected results:
MR entries should be successfully retrieved from backup or created when cache
becomes full; calling mlx5_malloc() on external heap socket should not be
possible when rte_extmem_* API is used. As it is stated in the DPDK
documentation[1], "Memory added this way will not be available for any regular
DPDK allocators".
Build Date & Hardware:
20 Jun 2023 on Debian GNU/Linux 4.18.0
[1]: <a href="https://doc.dpdk.org/guides-21.11/prog_guide/env_abstraction_layer.html">https://doc.dpdk.org/guides-21.11/prog_guide/env_abstraction_layer.html</a>
</pre>
</div>
</p>
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