1IBV_POST_SRQ_RECV(3)    Libibverbs Programmer's Manual    IBV_POST_SRQ_RECV(3)
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NAME

6       ibv_post_srq_recv  -  post  a  list  of work requests (WRs) to a shared
7       receive queue (SRQ)
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SYNOPSIS

10       #include <infiniband/verbs.h>
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12       int ibv_post_srq_recv(struct ibv_srq *srq, struct ibv_recv_wr *wr,
13                             struct ibv_recv_wr **bad_wr);
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DESCRIPTION

16       ibv_post_srq_recv() posts the linked list of work requests (WRs) start‐
17       ing with wr to the shared receive queue (SRQ) srq.  It stops processing
18       WRs from this list at the first failure (that can be  detected  immedi‐
19       ately  while  requests  are  being posted), and returns this failing WR
20       through bad_wr.
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22       The argument wr is  an  ibv_recv_wr  struct,  as  defined  in  <infini‐
23       band/verbs.h>.
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25       struct ibv_recv_wr {
26               uint64_t                wr_id;     /* User defined WR ID */
27               struct ibv_recv_wr     *next;      /* Pointer to next WR in list, NULL if last WR */
28               struct ibv_sge         *sg_list;   /* Pointer to the s/g array */
29               int                     num_sge;   /* Size of the s/g array */
30       };
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32       struct ibv_sge {
33               uint64_t                addr;      /* Start address of the local memory buffer */
34               uint32_t                length;    /* Length of the buffer */
35               uint32_t                lkey;      /* Key of the local Memory Region */
36       };
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RETURN VALUE

39       ibv_post_srq_recv()  returns  0  on  success,  or the value of errno on
40       failure (which indicates the failure reason).
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NOTES

43       The buffers used by a WR can only be safely reused after WR the request
44       is  fully  executed  and  a work completion has been retrieved from the
45       corresponding completion queue (CQ).
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47       If a WR is being posted to a UD QP, the Global Routing Header (GRH)  of
48       the  incoming  message will be placed in the first 40 bytes of the buf‐
49       fer(s) in the scatter list.  If no GRH is present in the incoming  mes‐
50       sage,  then  the first bytes will be undefined.  This means that in all
51       cases, the actual data of the incoming message will start at an  offset
52       of 40 bytes into the buffer(s) in the scatter list.
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SEE ALSO

55       ibv_create_qp(3), ibv_post_send(3), ibv_post_recv(3), ibv_poll_cq(3)
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AUTHORS

58       Dotan Barak <dotanba@gmail.com>
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62libibverbs                        2006-10-31              IBV_POST_SRQ_RECV(3)
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