【RDMA】ibv_create_qp, ibv_destroy_qp
https://www.rdmamojo.com/2012/12/21/ibv_create_qp/
Description
ibv_create_qp() creates a queue pair (QP) associated with the protection domain pd. The argument qp_init_attr is an ibv_qp_init_attr struct, as defined in <rdma/verbs.h>.
struct ibv_qp_init_attr { | |||
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; | /*Not Supported*/ | |
struct ibv_qp_cap | cap; | /*QP capabilities*/ | |
enum ibv_qp_type | qp_type; | /*QP Transport Service Type: IBV_QPT_RC,*/ | |
int | sq_sig_all; | /*If set, each Work Request (WR) submitted to the SQ*/ | |
/*generates a completion entry */ | |||
struct ibv_xrc_domain | xrc_domain; | /*Not supported*/ | |
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*/ |
qp_type: The desired QP type (see enum ibv_qp_type)
qp_context: Associated QP context
scq: Send CQ to be used for this QP
rcq: Receive CQ to be used for this QP
srq: Shared receive queue to be used as RQ in QP
cap: A QPCap object
sq_sig_all: If set, each send WR will generate a completion
entry
:return: A QpInitAttr object
The function ibv_create_qp() updates the qp_init_attr->cap struct with the actual QP 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.
Input Parameters
pd | struct ibv_pd from ibv_alloc_pd. |
qp_init_attr | Initial attributes of queue pair. |
Output Parameters
qp_init_attr | Actual values are filled in. |
Return Value
ibv_create_qp() returns a pointer to the created QP on success, or NULL if the request fails.
ibv_destroy_qp() returns 0 on success, or the value of errno on failure (which indicates the failure reason).
Parent topic: Queue Pair Management
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