IBV_CREATE_WQ(3) Libibverbs Programmer's Manual IBV_CREATE_WQ(3)

ibv_create_wq, ibv_destroy_wq - create or destroy a Work Queue (WQ).

#include <infiniband/verbs.h>

struct ibv_wq *ibv_create_wq(struct ibv_context *context,
                                     struct ibv_wq_init_attr *wq_init_attr);

int ibv_destroy_wq(struct ibv_wq *wq);

ibv_create_wq() creates a WQ associated with the ibv_context context. The argument wq_init_attr is an ibv_wq_init_attr struct, as defined in <infiniband/verbs.h>.

struct ibv_wq_init_attr {

void *wq_context; /* Associated context of the WQ */ enum ibv_wq_type wq_type; /* WQ type */ uint32_t max_wr; /* Requested max number of outstanding WRs in the WQ */ uint32_t max_sge; /* Requested max number of scatter/gather (s/g) elements per WR in the WQ */ struct ibv_pd *pd; /* PD to be associated with the WQ */ struct ibv_cq *cq; /* CQ to be associated with the WQ */ uint32_t comp_mask; /* Identifies valid fields. Use ibv_wq_init_attr_mask */ uint32_t create_flags /* Creation flags for this WQ, use enum ibv_wq_flags */
enum ibv_wq_flags {
IBV_WQ_FLAGS_CVLAN_STRIPPING = 1 << 0, /* CVLAN field will be stripped from incoming packets */ IBV_WQ_FLAGS_SCATTER_FCS = 1 << 1, /* FCS field will be scattered to host memory */ IBV_WQ_FLAGS_DELAY_DROP = 1 << 2, /* Packets won't be dropped immediately if no receive WQEs */ IBV_WQ_FLAGS_PCI_WRITE_END_PADDING = 1 << 3, /* Incoming packets will be padded to cacheline size */ IBV_WQ_FLAGS_RESERVED = 1 << 4,

The function ibv_create_wq() will update the wq_init_attr->max_wr and wq_init_attr->max_sge fields with the actual WQ values of the WQ that was created; the values will be greater than or equal to the values requested.

ibv_destroy_wq() destroys the WQ wq.

ibv_create_wq() returns a pointer to the created WQ, or NULL if the request fails.

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


2016-07-27 libibverbs