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: ofe...@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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