[DPDK/ethdev Bug 1526] rte_eth_rx_burst is blocking in libpcap pmd on no packets

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1526

            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 getting 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=64, rx_pkts=0x7ffec08382b0,
queue_id=<optimized out>, port_id=<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!

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