DPDK初始化Mellanox失败（mlx5）无法获取VF

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已于 2022-10-18 16:41:24 修改 · 7.3k 阅读

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#DPDK #docker

于 2022-06-10 14:25:24 首次发布

博客内容主要涉及DPDK初始化过程中遇到的VFIO支持问题，包括如何创建和配置VF，以及解决VF无法被使用的错误。作者详细解释了错误原因，并给出了从检查VFIO驱动到调整设备状态的一系列步骤，如设置VF为可信，以及在容器环境中正确使用VF的注意事项。最后，展示了成功初始化的输出示例。

记录一下，方便以后查阅。

错误如下

1、
EAL: VFIO support initialized
EAL: Probe PCI driver: mlx5_pci (15b3:101e) device: 0000:12:01.0 (socket 0)
mlx5_pci: no Verbs device matches PCI device 0000:12:01.0, are kernel drivers loaded?
common_mlx5: Failed to load driver = mlx5_pci.
EAL: Requested device 0000:b5:01.2 cannot be used
EAL: Bus (pci) probe failed.
EAL: No legacy callbacks, legacy socket not created

代码如下
code from：
https://github.com/zartbot/learn_dpdk

#include <stdint.h>
#include <unistd.h>
#include <inttypes.h>
#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_cycles.h>
#include <rte_lcore.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_ip.h>
#include <rte_udp.h>
#include <pthread.h>
#include <string.h>

#define MAX_PORTS 16
#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024

#define NUM_MBUFS 8191
#define MBUF_CACHE_SIZE 250
#define BURST_SIZE 32

static int hwts_dynfield_offset = -1;

static inline rte_mbuf_timestamp_t *
hwts_field(struct rte_mbuf *mbuf)
{
   
   
 return RTE_MBUF_DYNFIELD(mbuf,
   hwts_dynfield_offset, rte_mbuf_timestamp_t *);
}

typedef uint64_t tsc_t;
static int tsc_dynfield_offset = -1;

static inline tsc_t *
tsc_field(struct rte_mbuf *mbuf)
{
   
   
 return RTE_MBUF_DYNFIELD(mbuf, tsc_dynfield_offset, tsc_t *);
}

static uint16_t
add_timestamps(uint16_t port __rte_unused, uint16_t qidx __rte_unused,
  struct rte_mbuf **pkts, uint16_t nb_pkts,
  uint16_t max_pkts __rte_unused, void *_ __rte_unused)
{
   
   
 unsigned i;
 uint64_t now = rte_rdtsc();

 for (i = 0; i < nb_pkts; i++)
  printf("packet[%d] sendtime: %ld\n",i,now);
 return nb_pkts;
}

static const struct rte_eth_conf port_conf_default = {
   
   
    .rxmode = {
   
   
        .max_rx_pkt_len = RTE_ETHER_MAX_LEN,
    },
};

static inline int
port_init(uint16_t port, struct rte_mempool *mbuf_pool)
{
   
   
    struct rte_eth_conf port_conf = port_conf_default;
    const uint16_t rx_rings = 1, tx_rings = 1;
    uint16_t nb_rxd = RX_RING_SIZE;
    uint16_t nb_txd = TX_RING_SIZE;
    int retval;
    uint16_t q;
    struct rte_eth_dev_info dev_info;
    struct rte_eth_txconf txconf;

    if (!rte_eth_dev_is_valid_port(port))
        return -1;

    retval = rte_eth_dev_info_get(port, &dev_info);
    if (retval != 0)
    {
   
   
        printf("Error during getting device (port %u) info: %s\n",
               port, strerror(-retval));
        return retval;
    }
    printf("\n\ninitializing port %d...\n", port);


    if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_CHECKSUM)
    {
   
   
        printf("port[%u] support RX cheksum offload.\n", port);
        port_conf.rxmode.offloads |= DEV_RX_OFFLOAD_CHECKSUM;
    }


 if (!(dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TIMESTAMP)) {
   
   
   printf("\nERROR: Port %u does not support hardware timestamping\n"
     , port);
   return -1;
  }
  port_conf.rxmode.offloads |= DEV_RX_OFFLOAD_TIMESTAMP;
  rte_mbuf_dyn_rx_timestamp_register(&hwts_dynfield_offset, NULL);
  if

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