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From: Yasuhiro Ohara <yasu@nttv6.jp>
To: dev@dpdk.org
Subject: [dpdk-dev] ConnectX-4/mlx5 crashes around rxq_cqe_comp_en?
Date: Sat, 13 Jul 2019 01:38:53 +0900 (JST)
Message-ID: <20190713.013853.751044529514409504.yasu@nttv6.jp> (raw)


I get a crash when I put a significant amount of load on ConnectX-4/mlx5,
i.e., 50Gbps for 100GbE port.

Thread 22 "lcore-slave-19" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffe77ee700 (LWP 33519)]
0x0000555555f010a3 in _mm_storeu_si128 (__B=..., __P=0x10)
    at /usr/lib/gcc/x86_64-linux-gnu/7/include/emmintrin.h:721
721       *__P = __B;
(gdb) bt
#0  0x0000555555f010a3 in _mm_storeu_si128 (__B=..., __P=0x10)
    at /usr/lib/gcc/x86_64-linux-gnu/7/include/emmintrin.h:721
#1  rxq_cq_decompress_v (rxq=0x22c910ccc0, cq=0x22c8fd1800, elts=0x22c910d240)
    at /usr/local/dpdk-stable-18.11.2/drivers/net/mlx5/mlx5_rxtx_vec_sse.h:421
#2  0x0000555555f04b42 in rxq_burst_v (rxq=0x22c910ccc0, pkts=0x7fffe77eba40, 
    pkts_n=32, err=0x7fffe77dc978)
    at /usr/local/dpdk-stable-18.11.2/drivers/net/mlx5/mlx5_rxtx_vec_sse.h:956
#3  0x0000555555f055ea in mlx5_rx_burst_vec (dpdk_rxq=0x22c910ccc0, 
    pkts=0x7fffe77eba40, pkts_n=32)
    at /usr/local/dpdk-stable-18.11.2/drivers/net/mlx5/mlx5_rxtx_vec.c:238
#4  0x0000555555632772 in rte_eth_rx_burst (port_id=4, queue_id=5, 
    rx_pkts=0x7fffe77eba40, nb_pkts=32)
    at /usr/local/dpdk-18.11/x86_64-native-linuxapp-gcc/include/rte_ethdev.h:3879

My environments are:

Ubuntu 18.04.2 LTS 4.15.0-50-generic
fw_ver: 12.17.2020
vendor_id: 0x02c9
vendor_part_id: 4115
hw_ver: 0x0
board_id: LNR3270110033
DPDK 18.11.2

It looks like the CQE compression is the crashing place.

953         /* Decompress the last CQE if compressed. */
954         if (comp_idx < MLX5_VPMD_DESCS_PER_LOOP && comp_idx == n) {
955                 assert(comp_idx == (nocmp_n % MLX5_VPMD_DESCS_PER_LOOP));
956                 rxq_cq_decompress_v(rxq, &cq[nocmp_n], &elts[nocmp_n]);

And I'm wondering how I can disable rxq_cqe_comp_en devargs.

22.5.3. Run-time configuration
rxq_cqe_comp_en parameter [int]

Any information or guesses are appreciated.

Best regards,

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