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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [DPDK/ethdev Bug 1526] rte_eth_rx_burst is blocking in libpcap pmd
on no packets
Date: Thu, 22 Aug 2024 14:00:56 +0000
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Date: Thu, 22 Aug 2024 16:00:56 +0200
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https://bugs.dpdk.org/show_bug.cgi?id=3D1526
Bug ID: 1526
Summary: rte_eth_rx_burst is blocking in libpcap pmd on no
packets
Product: DPDK
Version: 24.03
Hardware: x86
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: ofer.d@claroty.com
Target Milestone: ---
Hi,
I see a weird behaviour when using libpcap pmd, that when no packets gettin=
g to
interface, the call to rte_eth_rx_burst is blocking.
I see the following stack:
#0 0x00007f17d496cbcf in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x000055f290d6ef84 in pcap_wait_for_frames_mmap ()
#2 0x000055f290d71db0 in pcap_read_linux_mmap_v3 ()
#3 0x000055f290d50c8f in pcap_next ()
#4 0x000055f290714263 in eth_pcap_rx ()
#5 0x000055f29018f2f2 in rte_eth_rx_burst (nb_pkts=3D64, rx_pkts=3D0x7ffec=
08382b0,
queue_id=3D<optimized out>, port_id=3D<optimized out>) at
/usr/local/stow/dpdk/include/rte_ethdev.h:6110
I looked in libpcap and it indeed seems that pcap_read_linux_mmap_v3 is
blocking, and what is meant to be called, when using dpdk, is
pcap_dpdk_dispatch (which indeed seems non blocking).
Can you please help debug and understand why is it behaving like that?
Thanks ahead!
--=20
You are receiving this mail because:
You are the assignee for the bug.=
--17243352560.94cfca.2245430
Date: Thu, 22 Aug 2024 16:00:56 +0200
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<html>
<head>
<base href=3D"https://bugs.dpdk.org/">
</head>
<body><table border=3D"1" cellspacing=3D"0" cellpadding=3D"8" class=3D"=
bz_new_table">
<tr>
<th>Bug ID</th>
<td><a class=3D"bz_bug_link=20
bz_status_UNCONFIRMED "
title=3D"UNCONFIRMED - rte_eth_rx_burst is blocking in libpcap pmd on no=
packets"
href=3D"https://bugs.dpdk.org/show_bug.cgi?id=3D1526">1526</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>rte_eth_rx_burst is blocking in libpcap pmd on no packets
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>24.03
</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>ethdev
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ofer.d@claroty.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class=3D"bz_comment_block">
<pre class=3D"bz_comment_text">Hi,
I see a weird behaviour when using libpcap pmd, that when no packets gettin=
g to
interface, the call to rte_eth_rx_burst is blocking.
I see the following stack:
#0 0x00007f17d496cbcf in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x000055f290d6ef84 in pcap_wait_for_frames_mmap ()
#2 0x000055f290d71db0 in pcap_read_linux_mmap_v3 ()
#3 0x000055f290d50c8f in pcap_next ()
#4 0x000055f290714263 in eth_pcap_rx ()
#5 0x000055f29018f2f2 in rte_eth_rx_burst (nb_pkts=3D64, rx_pkts=3D0x7ffec=
08382b0,
queue_id=3D<optimized out>, port_id=3D<optimized out>) at
/usr/local/stow/dpdk/include/rte_ethdev.h:6110
I looked in libpcap and it indeed seems that pcap_read_linux_mmap_v3 is
blocking, and what is meant to be called, when using dpdk, is
pcap_dpdk_dispatch (which indeed seems non blocking).
Can you please help debug and understand why is it behaving like that?
Thanks ahead!
</pre>
</div>
</p>
<hr>
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<ul>
<li>You are the assignee for the bug.</li>
</ul>
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