ibv_query_port
Queries the attributes of an RDMA port.
Syntax
Description
The ibv_query_port() function returns the attributes of port port_num for device context context through the pointer port_attr. The parameter port_attr is an ibv_port_attr struct, as defined in the <rdma/verbs.h> file.
The
struct ibv_port_attr is as follows:
struct ibv_port_attr {
enum ibv_port_state state; /* Logical port state */
enum ibv_mtu max_mtu; /* Max MTU supported by port */
enum ibv_mtu active_mtu; /* Actual MTU */
int gid_tbl_len; /* Length of source GID table */
uint32_t port_cap_flags; /* Port capabilities */
uint32_t max_msg_sz; /* Maximum message size */
uint32_t bad_pkey_cntr; /* Bad P_Key counter */
uint32_t qkey_viol_cntr; /* Q_Key violation counter */
uint16_t pkey_tbl_len; /* Length of partition table */
uint16_t lid; /* Base port LID */
uint16_t sm_lid; /* SM LID */
uint8_t lmc; /* LMC of LID */
uint8_t max_vl_num; /* Maximum number of VLs */
uint8_t sm_sl; /* SM service level */
uint8_t subnet_timeout; /* Subnet propagation delay */
uint8_t init_type_reply;/* Type of initialization performed by SM */
uint8_t active_width; /* Currently active link width */
uint8_t active_speed; /* Currently active link speed */
uint8_t phys_state; /* Physical port state */
uint8_t link_layer; /* link layer protocol of the port */
};
Input Parameters
| Item | Description |
|---|---|
| context | Specifies the struct ibv_context from the ibv_open_device function. |
| port_num | Specifies the physical port number (1 is the first port). |
Output Parameter
| Item | Description |
|---|---|
| port_attr | Specifies the struct ibv_port_attr that contains the port attributes. |
Return Values
| Item | Description |
|---|---|
| 0 | On success. |
| errno | On failure. |