mirror of
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d6b92ffa99
kernel APIs. List of sources used: 1) rdma-core was cloned from "https://github.com/linux-rdma/rdma-core.git" Top commit d65138ef93af30b3ea249f3a84aa6a24ba7f8a75 2) OpenSM was cloned from git://git.openfabrics.org/~halr/opensm.git Top commit 85f841cf209f791c89a075048a907020e924528d 3) libibmad was cloned from "git://git.openfabrics.org/~iraweiny/libibmad.git" Tag 1.3.13 with some additional patches from Mellanox. 4) infiniband-diags was cloned from "git://git.openfabrics.org/~iraweiny/infiniband-diags.git" Tag 1.6.7 with some additional patches from Mellanox. Added the required Makefiles for building and installing. Sponsored by: Mellanox Technologies
70 lines
2.3 KiB
Groff
70 lines
2.3 KiB
Groff
.\" -*- nroff -*-
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.\" Licensed under the OpenIB.org BSD license (FreeBSD Variant) - See COPYING.md
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.\"
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.TH IBV_POST_SRQ_RECV 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
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.SH "NAME"
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ibv_post_srq_recv \- post a list of work requests (WRs) to a shared receive queue (SRQ)
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.SH "SYNOPSIS"
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.nf
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.B #include <infiniband/verbs.h>
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.sp
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.BI "int ibv_post_srq_recv(struct ibv_srq " "*srq" ", struct ibv_recv_wr " "*wr" ,
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.BI " struct ibv_recv_wr " "**bad_wr" );
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.fi
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.SH "DESCRIPTION"
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.B ibv_post_srq_recv()
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posts the linked list of work requests (WRs) starting with
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.I wr
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to the shared receive queue (SRQ)
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.I srq\fR.
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It stops processing WRs from this list at the first failure (that can
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be detected immediately while requests are being posted), and returns
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this failing WR through
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.I bad_wr\fR.
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.PP
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The argument
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.I wr
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is an ibv_recv_wr struct, as defined in <infiniband/verbs.h>.
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.PP
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.nf
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struct ibv_recv_wr {
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.in +8
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uint64_t wr_id; /* User defined WR ID */
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struct ibv_recv_wr *next; /* Pointer to next WR in list, NULL if last WR */
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struct ibv_sge *sg_list; /* Pointer to the s/g array */
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int num_sge; /* Size of the s/g array */
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.in -8
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};
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.sp
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.nf
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struct ibv_sge {
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.in +8
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uint64_t addr; /* Start address of the local memory buffer */
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uint32_t length; /* Length of the buffer */
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uint32_t lkey; /* Key of the local Memory Region */
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.in -8
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};
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.fi
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.SH "RETURN VALUE"
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.B ibv_post_srq_recv()
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returns 0 on success, or the value of errno on failure (which indicates the failure reason).
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.SH "NOTES"
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The buffers used by a WR can only be safely reused after WR the
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request is fully executed and a work completion has been retrieved
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from the corresponding completion queue (CQ).
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.PP
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If a WR is being posted to a UD QP, the Global Routing Header (GRH) of
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the incoming message will be placed in the first 40 bytes of the
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buffer(s) in the scatter list. If no GRH is present in the incoming
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message, then the first bytes will be undefined. This means that in
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all cases, the actual data of the incoming message will start at an
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offset of 40 bytes into the buffer(s) in the scatter list.
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.SH "SEE ALSO"
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.BR ibv_create_qp (3),
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.BR ibv_post_send (3),
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.BR ibv_post_recv (3),
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.BR ibv_poll_cq (3)
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.SH "AUTHORS"
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.TP
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Dotan Barak <dotanba@gmail.com>
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