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From: Ming Fu <Ming.Fu@esentire.com>
To: "users@dpdk.org" <users@dpdk.org>
Thread-Topic: dpdk with snort 2.9.9 receive from DPDK ring
Thread-Index: AdMhCIjMMcbfqufVSFGBQ7RCk7Cd8A==
Date: Tue, 29 Aug 2017 20:51:43 +0000
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Subject: [dpdk-users] dpdk with snort 2.9.9 receive from DPDK ring
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I am making a snort DAQ module to receive packet from DPDK capture through =
a ring. The snort version is 2.9.9 and DPDK version is 17.08. The code is v=
ery similar to the multi_process/client_server_mp example. The DPDK is init=
ialized in daq initialize function and mbuf received from daq acquire funct=
ion. Snort inspects the mbuf but does not re-inject back to the network, so=
daq free the mbuf by rte_pktmbuf_free(mbuf) in the same thread as it calls=
rte_ring_dequeue_burst();
The snort successfully received the first burst of 32 packets, but it fails=
on the first rte_pktmbuf_free().
Seems some internal dpdk function pointer is NULL.
#0 0x0000000000000000 in ?? ()
#1 0x00000000004f7a8d in rte_mempool_ops_enqueue_bulk (n=3D<optimized out>=
, obj_table=3D<optimized out>, mp=3D<optimized out>)
at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:497
#2 __mempool_generic_put (cache=3D<optimized out>, n=3D1, obj_table=3D0x7f=
ffffffe6e8, mp=3D<optimized out>) at /home/mfu/work/dpdk-17.08/build/includ=
e/rte_mempool.h:1069
#3 rte_mempool_generic_put (flags=3D<optimized out>, cache=3D<optimized ou=
t>, n=3D1, obj_table=3D0x7fffffffe6e8, mp=3D<optimized out>)
at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:1109
#4 rte_mempool_put_bulk (n=3D1, obj_table=3D0x7fffffffe6e8, mp=3D<optimize=
d out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:1132
#5 rte_mempool_put (obj=3D<optimized out>, mp=3D<optimized out>) at /home/=
mfu/work/dpdk-17.08/build/include/rte_mempool.h:1150
#6 rte_mbuf_raw_free (m=3D<optimized out>) at /home/mfu/work/dpdk-17.08/bu=
ild/include/rte_mbuf.h:853
#7 rte_pktmbuf_free_seg (m=3D<optimized out>) at /home/mfu/work/dpdk-17.08=
/build/include/rte_mbuf.h:1349
#8 rte_pktmbuf_free (m=3D<optimized out>) at /home/mfu/work/dpdk-17.08/bui=
ld/include/rte_mbuf.h:1369
#9 dpdk_daq_acquire (handle=3D0x1af6910, cnt=3D0, callback=3D<optimized ou=
t>, metaback=3D<optimized out>, user=3D<optimized out>) at daq_dpdk.c:234
#10 0x00000000004551d3 in DAQ_Acquire ()
#11 0x0000000000437828 in SnortMain ()
#12 0x00007ffff61af830 in __libc_start_main () from /lib/x86_64-linux-gnu/l=
ibc.so.6
#13 0x0000000000406d29 in _start ()
I notice that snort has three threads,
(gdb) info thread
Id Target Id Frame
* 1 Thread 0x7ffff7fdf8c0 (LWP 42472) "snort" 0x0000000000000000 in ?? (=
)
2 Thread 0x7fffdff5a700 (LWP 42481) "eal-intr-thread" 0x00007ffff62969=
d3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
3 Thread 0x7fffdf4d5700 (LWP 42482) "snort" 0x00007ffff625b30d in nano=
sleep () from /lib/x86_64-linux-gnu/libc.so.6
Would it be a problem if the rte_pktmbuf_free() is not called from the eal =
thread?
Thanks
Ming