[dpdk-users] dpdk with snort 2.9.9 receive from DPDK ring
Ming Fu
Ming.Fu at esentire.com
Tue Aug 29 22:51:43 CEST 2017
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 very similar to the multi_process/client_server_mp example. The DPDK is initialized in daq initialize function and mbuf received from daq acquire function. 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=<optimized out>, obj_table=<optimized out>, mp=<optimized out>)
at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:497
#2 __mempool_generic_put (cache=<optimized out>, n=1, obj_table=0x7fffffffe6e8, mp=<optimized out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:1069
#3 rte_mempool_generic_put (flags=<optimized out>, cache=<optimized out>, n=1, obj_table=0x7fffffffe6e8, mp=<optimized out>)
at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:1109
#4 rte_mempool_put_bulk (n=1, obj_table=0x7fffffffe6e8, mp=<optimized out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:1132
#5 rte_mempool_put (obj=<optimized out>, mp=<optimized out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mempool.h:1150
#6 rte_mbuf_raw_free (m=<optimized out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mbuf.h:853
#7 rte_pktmbuf_free_seg (m=<optimized out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mbuf.h:1349
#8 rte_pktmbuf_free (m=<optimized out>) at /home/mfu/work/dpdk-17.08/build/include/rte_mbuf.h:1369
#9 dpdk_daq_acquire (handle=0x1af6910, cnt=0, callback=<optimized out>, metaback=<optimized out>, user=<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/libc.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" 0x00007ffff62969d3 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
3 Thread 0x7fffdf4d5700 (LWP 42482) "snort" 0x00007ffff625b30d in nanosleep () 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
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