NAME¶

mlx5dv_query_port - Query non standard attributes of IB device port.

SYNOPSIS¶

#include <infiniband/mlx5dv.h>
int mlx5dv_query_port(struct ibv_context *context,
              uint32_t port_num,
              struct mlx5dv_port *info);
    

DESCRIPTION¶

Query port info which can be used for some device commands over the DEVX interface and when directly accessing the hardware resources.

A function that lets a user query hardware and configuration attributes associated with the port.

USAGE¶

A user should provide the port number to query. On successful query flags will store a subset of the requested attributes which are supported/relevant for that port.

ARGUMENTS¶

context

RDMA device context to work on.

port_num

Port number to query.

## info

Stores the returned attributes from the kernel.

struct mlx5dv_port {
    uint64_t flags;
    uint16_t vport;
    uint16_t vport_vhca_id;
    uint16_t esw_owner_vhca_id;
    uint16_t rsvd0;
    uint64_t vport_steering_icm_rx;
    uint64_t vport_steering_icm_tx;
    struct mlx5dv_reg reg_c0;
};

flags

Bit field of attributes, on successful query flags stores the valid filled attributes.

vport

The VPORT number of that port.

vport_vhca_id

The VHCA ID of vport_num.

rsvd0

A reserved field. Not to be used.

esw_owner_vhca_id

The E-Switch owner of vport_num.

vport_steering_ica_rx

The ICM RX address when directing traffic.

vport_steering_icm_tx

The ICM TX address when directing traffic.

## reg_c0

Register C0 value used to identify traffic of vport_num.

struct mlx5dv_reg {
        uint32_t value;
        uint32_t mask;
};

value

The value that should be used as match.

mask

The mask that should be used when matching.

RETURN VALUE¶

returns 0 on success, or the value of errno on failure (which indicates the failure reason).

EXAMPLE¶

for (i = 1; i <= ports; i++) {
    ret = mlx5dv_query_port(context, i, &port_info);
    if (ret) {
        printf("Error querying port %d\n", i);
        break;
    }
    printf("Port: %d:\n", i);
    if (port_info.flags & MLX5DV_QUERY_PORT_VPORT)
        printf("\tvport_num: 0x%x\n", port_info.vport_num);
    if (port_info.flags & MLX5DV_QUERY_PORT_VPORT_REG_C0)
        printf("\treg_c0: val: 0x%x mask: 0x%x\n",
                port_info.reg_c0.value,
                port_info.reg_c0.mask);
}

Mark Bloch <mbloch@nvidia.com>