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mlx5dv_query_port(3) mlx5dv_query_port(3)

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

RDMA device context to work on.
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;
};
Bit field of attributes, on successful query flags stores the valid filled attributes.

MLX5DV_QUERY_PORT_VPORT: The vport number of that port.

MLX5DV_QUERY_PORT_VPORT_VHCA_ID: The VHCA ID of vport_num.

MLX5DV_QUERY_PORT_ESW_OWNER_VHCA_ID: The E-Switch owner of vport_num.

MLX5DV_QUERY_PORT_VPORT_STEERING_ICM_RX: The ICM RX address when directing traffic.

MLX5DV_QUERY_PORT_VPORT_STEERING_ICM_TX: The ICM TX address when directing traffic.

MLX5DV_QUERY_PORT_VPORT_REG_C0: Register C0 value used to identify egress of vport_num.

The VPORT number of that port.
The VHCA ID of vport_num.
A reserved field. Not to be used.
The E-Switch owner of vport_num.
The ICM RX address when directing traffic.
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;
};
The value that should be used as match.
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>