Query an rdma port's attributes
#include <infiniband/verbs.h>
int ibv_query_port(struct ibv_context *context, uint8_t port_num,
struct ibv_port_attr *port_attr);
ibv_query_port() returns the attributes of port port_num for device context context through the pointer port_attr. The argument port_attr is an ibv_port_attr struct, as defined in <infiniband/verbs.h>.
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 */
};
possible values for the link layer field are IBV_LINK_LAYER_INFINIBAND,
IBV_LINK_LAYER_ETHERNET, or IBV_LINK_LAYER_UNSPECIFIED.
ibv_query_port() returns 0 on success, or the value of errno on failure (which indicates the failure reason).
Dotan Barak <[email protected]>