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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHORS | COLOPHON |
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IBV_POST_RECV(3) Libibverbs Programmer's Manual IBV_POST_RECV(3)
ibv_post_recv - post a list of work requests (WRs) to a receive
queue
#include <infiniband/verbs.h>
int ibv_post_recv(struct ibv_qp *qp, struct ibv_recv_wr *wr,
struct ibv_recv_wr **bad_wr);
ibv_post_recv() posts the linked list of work requests (WRs)
starting with wr to the receive queue of the queue pair qp. It
stops processing WRs from this list at the first failure (that
can be detected immediately while requests are being posted), and
returns this failing WR through bad_wr.
The argument wr is an ibv_recv_wr struct, as defined in
<infiniband/verbs.h>.
struct ibv_recv_wr {
uint64_t wr_id; /* User defined WR ID */
struct ibv_recv_wr *next; /* Pointer to next WR in list, NULL if last WR */
struct ibv_sge *sg_list; /* Pointer to the s/g array */
int num_sge; /* Size of the s/g array */
};
struct ibv_sge {
uint64_t addr; /* Start address of the local memory buffer */
uint32_t length; /* Length of the buffer */
uint32_t lkey; /* Key of the local Memory Region */
};
ibv_post_recv() returns 0 on success, or the value of errno on
failure (which indicates the failure reason).
The buffers used by a WR can only be safely reused after WR the
request is fully executed and a work completion has been
retrieved from the corresponding completion queue (CQ).
If the QP qp is associated with a shared receive queue, you must
use the function ibv_post_srq_recv(), and not ibv_post_recv(),
since the QP's own receive queue will not be used.
If a WR is being posted to a UD QP, the Global Routing Header
(GRH) of the incoming message will be placed in the first 40
bytes of the buffer(s) in the scatter list. If no GRH is present
in the incoming message, then the first bytes will be undefined.
This means that in all cases, the actual data of the incoming
message will start at an offset of 40 bytes into the buffer(s) in
the scatter list.
ibv_create_qp(3), ibv_post_send(3), ibv_post_srq_recv(3),
ibv_poll_cq(3)
Dotan Barak <dotanba@gmail.com>
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
linux-rdma@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2024-06-10.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
libibverbs 2006-10-31 IBV_POST_RECV(3)
Pages that refer to this page: ibv_poll_cq(3), ibv_post_send(3), ibv_post_srq_recv(3), ibv_reg_mr(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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