-*- nroff -*-
Licensed under the OpenIB.org BSD license (FreeBSD Variant) - See COPYING.md

ibv_create_qp_ex, ibv_destroy_qp - create or destroy a queue pair (QP)

 #include <infiniband/verbs.h>  "struct ibv_qp *ibv_create_qp_ex(struct ibv_context " "*context" ,  " struct ibv_qp_init_attr_ex " "*qp_init_attr" );  "int ibv_destroy_qp(struct ibv_qp " "*qp" ); 

ibv_create_qp_ex() creates a queue pair (QP) associated with the protection domain pd. The argument qp_init_attr_ex is an ibv_qp_init_attr_ex struct, as defined in <infiniband/verbs.h>.

struct ibv_qp_init_attr_ex {
void *qp_context; /* Associated context of the QP */
struct ibv_cq *send_cq; /* CQ to be associated with the Send Queue (SQ) */
struct ibv_cq *recv_cq; /* CQ to be associated with the Receive Queue (RQ) */
struct ibv_srq *srq; /* SRQ handle if QP is to be associated with an SRQ, otherwise NULL */
struct ibv_qp_cap cap; /* QP capabilities */
enum ibv_qp_type qp_type; /* QP Transport Service Type: IBV_QPT_RC, IBV_QPT_UC, IBV_QPT_UD or IBV_QPT_RAW_PACKET */
int sq_sig_all; /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
uint32_t comp_mask; /* Identifies valid fields */
struct ibv_pd *pd; /* PD to be associated with the QP */
struct ibv_xrcd *xrcd; /* XRC domain to be associated with the target QP */
enum ibv_qp_create_flags create_flags; /* Creation flags for this QP */
uint16_t max_tso_header; /* Maximum TSO header size */
struct ibv_rwq_ind_table *rwq_ind_tbl; /* Indirection table to be associated with the QP */
struct ibv_rx_hash_conf rx_hash_conf; /* RX hash configuration to be used */
};
struct ibv_qp_cap {
uint32_t max_send_wr; /* Requested max number of outstanding WRs in the SQ */
uint32_t max_recv_wr; /* Requested max number of outstanding WRs in the RQ */
uint32_t max_send_sge; /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
uint32_t max_recv_sge; /* Requested max number of s/g elements in a WR in the SQ */
uint32_t max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
};
enum ibv_qp_create_flags {
IBV_QP_CREATE_BLOCK_SELF_MCAST_LB = 1 << 1, /* Prevent self multicast loopback */
IBV_QP_CREATE_SCATTER_FCS = 1 << 8, /* FCS field will be scattered to host memory */
IBV_QP_CREATE_CVLAN_STRIPPING = 1 << 9, /* CVLAN field will be stripped from incoming packets */
};
struct ibv_rx_hash_conf {
uint8_t rx_hash_function; /* RX hash function, use enum ibv_rx_hash_function_flags */
uint8_t rx_hash_key_len; /* RX hash key length */
uint8_t *rx_hash_key; /* RX hash key data */
uint64_t rx_hash_fields_mask; /* RX fields that should participate in the hashing, use enum ibv_rx_hash_fields */
};


The function
 ibv_create_qp_ex() will update the
 qp_init_attr_ex->cap struct with the actual \s-1QP\s0 values of the QP that was created;
the values will be greater than or equal to the values requested.

 ibv_destroy_qp() destroys the QP
 qp. 
 "RETURN VALUE"
 ibv_create_qp_ex() returns a pointer to the created QP, or NULL if the request fails.
Check the QP number (qp_num) in the returned QP.

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

The attributes max_recv_wr and max_recv_sge are ignored by
 ibv_create_qp_ex() if the QP is to be associated with an SRQ.

 ibv_destroy_qp() fails if the QP is attached to a multicast group.
 "SEE ALSO"
 ibv_alloc_pd (3),  ibv_modify_qp (3),  ibv_query_qp (3),  ibv_create_rwq_ind_table (3) 
 "AUTHORS"

Yishai Hadas <yishaih@mellanox.com>