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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 - PHY link up fails when rebinding i40e NICs to kernel driver"
href="https://bugs.dpdk.org/show_bug.cgi?id=1653">1653</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>PHY link up fails when rebinding i40e NICs to kernel driver
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</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>ethdev
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nandinipersad361@gmail.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">Some kernel drivers are not able to handle the link status correctly after DPDK
application sets the PHY to link down.
Implication:
The link status can’t be set to “up” after the NIC is rebound to the kernel
driver. Before a DPDK application quits it will invoke the function
i40e_dev_stop() which will sets the PHY to link down. Some kernel drivers may
not be able to handle the link status correctly after it retakes control of the
device. This is a known PHY link configuration issue in the i40e kernel driver.
The fix has been addressed in the 2.7.4 rc version. So if the i40e kernel
driver is < 2.7.4 and doesn’t have the fix backported it will encounter this
issue.
Resolution/Workaround:
First try to remove and reinsert the i40e kernel driver. If that fails reboot
the system.
Affected Environment/Platform:
All.
Driver/Module:
Poll Mode Driver (PMD).
</pre>
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</p>
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