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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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--17243352560.94cfca.2245430
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&#64;dpdk.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ofer.d&#64;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&lt;optimized out&gt;, port_id=3D&lt;optimized out&gt;) 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>


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