Re: [dpdk-dev] ConnectX-4/mlx5 crashes around rxq_cqe_comp_en?

[Yasuhiro Ohara <yasu@nttv6.jp>]

Hi Slava,

Thank you, I will file it.

regards,
Yasu

From: Slava Ovsiienko <viacheslavo@mellanox.com>
Subject: Re: [dpdk-dev] ConnectX-4/mlx5 crashes around rxq_cqe_comp_en?
Date: Fri, 19 Jul 2019 03:53:54 +0000
Message-ID: <VI1PR05MB32785E2D983E9C8C4A8EEE4FD2CB0@VI1PR05MB3278.eurprd05.prod.outlook.com>

> Hi, Yasuhiro
> 
> Could you, please, create the ticket in Bugzilla.dpdk.org to store the details?
> The Rx CQE compression can be disabled with specifying "rxq_cqe_comp_en=0".
> 
> WBR, Slava
> 
>> -----Original Message-----
>> From: dev <dev-bounces@dpdk.org> On Behalf Of Yasuhiro Ohara
>> Sent: Friday, July 19, 2019 5:20
>> To: dev@dpdk.org
>> Subject: Re: [dpdk-dev] ConnectX-4/mlx5 crashes around rxq_cqe_comp_en?
>> 
>> 
>> The same goes with DPDK-19.05 too.
>> 
>> When crash happens,
>> mcqe_n == t_pkt->data_len == 124.
>> 
>> struct rte_mbuf **elts (which seems to be prepared somewhere) looks like
>> it's supposed to contain valid mbufs, but (when under a significant load?) it
>> doesn't.
>> 
>> (gdb) p/x (void*[124])elts[0]
>> $31 = {0x1d0bd0d80, 0x1d1cfef80, 0x1d28f6a40, 0x1d22eb100,
>> 0x1d195a8c0,
>>   0x1d2137200, 0x1d1eb5540, 0x1d1d0fec0, 0x1d28ecf40, 0x1d19b1bc0,
>>   0x1cec8a200, 0x1d02e2980, 0x1d085cdc0, 0x1d04e8e00, 0x1ccb4e140,
>>   0x1d1e17e80, 0x1d17a1c40, 0x1d14a6e00, 0x1d2871700, 0x1d20b6c40,
>>   0x1d29831c0, 0x1d04941c0, 0x1d0921080, 0x1d070ea40, 0x1d148ea80,
>>   0x1cee100c0, 0x1d1a47e40, 0x1d0ee6600, 0x1d02f1200, 0x1d24bc100,
>>   0x1d1e84e40, 0x1d1e1f2c0, 0x1d28b7ac0, 0x1d2195940, 0x1d21bc540,
>>   0x1d228f080, 0x1d1026100, 0x1d285e100, 0x1d211c7c0, 0x1d2128980,
>>   0x1d1787200, 0x1d170e080, 0x1d1e0e380, 0x1ce638500, 0x1d21a6880,
>>   0x1d20d8ac0, 0x1d25e8600, 0x1d2377880, 0x1d0e13ac0, 0x1c0c07100,
>>   0x1c0c07100, 0x1c0c07100, 0x1c0c07100, 0x0, 0x0, 0x0, 0x0,
>> 0x7ffff7ff487c,
>>   0x1c0c06f00, 0x1c0c08b00, 0x0, 0x0, 0x7ffff7ff207c, 0x1, 0x1480,
>>   0x140000000, 0x100000000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
>>   0x40000000ffffffff, 0x4000000000000001, 0xcd64010000000002,
>>   0x0 <repeats 46 times>}
>> 
>> (gdb) p elts[48]
>> $38 = (struct rte_mbuf *) 0x1d0e13ac0
>> (gdb) p elts[49]
>> $39 = (struct rte_mbuf *) 0x1c0c07100
>> (gdb) p elts[50]
>> $40 = (struct rte_mbuf *) 0x1c0c07100
>> (gdb) p elts[51]
>> $41 = (struct rte_mbuf *) 0x1c0c07100
>> (gdb) p elts[52]
>> $42 = (struct rte_mbuf *) 0x1c0c07100
>> (gdb) p elts[53]
>> $43 = (struct rte_mbuf *) 0x0
>> 
>> Any thoughts?
>> 
>> regards,
>> Yasu
>> 
>> From: Yasuhiro Ohara <yasu@nttv6.jp>
>> 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>
>> 
>> >
>> > Hi,
>> >
>> > 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:42
>> > 1
>> > #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:95
>> > 6
>> > #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
>> > MLNX_OFED_LINUX-4.5-1.0.1.0-ubuntu18.04-x86_64
>> > 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.
>> >
>> > dpdk-stable-18.11.2/drivers/net/mlx5/mlx5_rxtx_vec_sse.h:956
>> > 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.
>> >
>> >
>> <https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoc
>> > .dpdk.org%2Fguides-
>> 18.02%2Fnics%2Fmlx5.html&amp;data=02%7C01%7Cviaches
>> >
>> lavo%40mellanox.com%7C346e0b13aba945bce40808d70befa6e9%7Ca6529
>> 71c7d2e4
>> >
>> d9ba6a4d149256f461b%7C0%7C0%7C636990996240384705&amp;sdata=id
>> %2FJY%2BM
>> > PhzsUBmFP9YoKtFkcu%2FbJtO6Ntb1QghmnSdQ%3D&amp;reserved=0>
>> > 22.5.3. Run-time configuration
>> > rxq_cqe_comp_en parameter [int]
>> >
>> > Any information or guesses are appreciated.
>> >
>> > Best regards,
>> > Yasu
>> >
>