DPDK MLX5 PMD驱动程序探测问题

Question

我无法在我的服务器上安装的某些Mellanox上使用mlx5 pmd驱动程序。我在EAL初始化期间收到的错误是：

et_mlx5:没有谓词设备与PCI设备0000:03:00.0匹配，是否加载内核驱动程序？

我目前使用的DPDK版本是:DPDK-STABLE 18.11

我已经安装了OFED最新版本：

mlnx-en-4.5-1.0.1.0-ubuntu16.04-x86_64

我已经执行了ib_uverbs内核模块的modprobe

下面是我使用的内核版本

moragalu@server:~$ uname -r
4.4.0-143-generic

以下是NIC型号：

moragalu@server:~$ lspci | grep Mell
03:00.0 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]
03:00.1 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]
06:00.0 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]
06:00.1 Ethernet controller: Mellanox Technologies MT27710 Family [ConnectX-4 Lx]

NIC正在使用的固件版本：

moragalu@eridium03:~$ ethtool -i eridium25-03
driver: mlx5_core
version: 4.5-1.0.1
firmware-version: 14.24.1000 (MT_2420110034)
expansion-rom-version: 
bus-info: 0000:06:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: yes

eal初始化的完整输出为：

EAL: Detected 16 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: No free hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
EAL: PCI device 0000:03:00.0 on NUMA socket 0
EAL:   probe driver: 15b3:1015 net_mlx5
net_mlx5: no Verbs device matches PCI device 0000:03:00.0, are kernel drivers loaded?
EAL: Requested device 0000:03:00.0 cannot be used
EAL: PCI device 0000:03:00.1 on NUMA socket 0
EAL:   probe driver: 15b3:1015 net_mlx5
net_mlx5: no Verbs device matches PCI device 0000:03:00.1, are kernel drivers loaded?
EAL: Requested device 0000:03:00.1 cannot be used
EAL: PCI device 0000:06:00.0 on NUMA socket 0
EAL:   probe driver: 15b3:1015 net_mlx5
net_mlx5: no Verbs device matches PCI device 0000:06:00.0, are kernel drivers loaded?
EAL: Requested device 0000:06:00.0 cannot be used
EAL: PCI device 0000:06:00.1 on NUMA socket 0
EAL:   probe driver: 15b3:1015 net_mlx5
net_mlx5: no Verbs device matches PCI device 0000:06:00.1, are kernel drivers loaded?
EAL: Requested device 0000:06:00.1 cannot be used
EAL: PCI device 0000:03:00.1 on NUMA socket 0
EAL:   probe driver: 15b3:1015 net_mlx5
net_mlx5: no Verbs device matches PCI device 0000:03:00.1, are kernel drivers loaded?
EAL: Driver cannot attach the device (03:00.1)
EAL: Failed to attach device on primary process

当前在内核中加载的模块：

moragalu@eridium03:~$ lsmod | grep ib
mlx5_ib                16384  0
mlx_compat             24576  4 mlx4_en,mlx5_ib,mlx4_core,mlx5_core
ib_uverbs              61440  0
ib_iser                49152  0
rdma_cm                49152  1 ib_iser
ib_cm                  49152  1 rdma_cm
ib_sa                  36864  2 rdma_cm,ib_cm
ib_mad                 49152  2 ib_cm,ib_sa
ib_core               106496  7 rdma_cm,ib_cm,ib_sa,iw_cm,ib_mad,ib_iser,ib_uverbs
ib_addr                20480  2 rdma_cm,ib_core

Answer 1

在对ibverbs依赖项使用RDMA-core库时，我也遇到了同样的问题。在过去，我设法在mlx5_core.c中找到了一个bug (在探测函数中将队列数硬编码为8，它神奇地工作了)，但我不确定这对您来说是否也是同样的问题。

不管怎样，当我安装了最新的Mellanox OFED Drivers后，这个问题就解决了，所以尝试一下是个好主意。只需记住使用以下命令进行安装：

mlnxofedinstall --dpdk --upstream-libs

编辑:刚刚注意到你已经安装了驱动程序--确保你按照上面的方式进行了安装。您还可以做的另一件事是:检查以下代码的输出(用-libverbs编译)：

#include <infiniband/verbs.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
int main() {
        struct ibv_device ** devices;
        int num;
        struct ibv_context * ctx;
        devices = ibv_get_device_list(&num);
        int i;
        if(devices[0] == NULL)
                printf("devices is null\n");
        printf("got %d devices\n", num);
        for (i=0;i<num;i++) {
                printf(ibv_get_device_name(devices[i]));
                printf("\n");
                ctx = ibv_open_device(devices[i]);
                if (ctx == NULL)
                        printf("ctx is null \n");
                else
                        printf("device opened\n");
        }
        if (errno)
                printf("ERROR: %s\n", strerror(errno));
        ibv_free_device_list(devices);
return 0;
}

如果它没有列出任何设备，至少你会知道这是动词驱动程序的问题，而不是DPDK本身的问题。