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CentOS 7.0 - man page for ibv_post_send (centos section 3)

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

       ibv_post_send - post a list of work requests (WRs) to a send queue

       #include <infiniband/verbs.h>

       int ibv_post_send(struct ibv_qp *qp, struct ibv_send_wr *wr,
			 struct ibv_send_wr **bad_wr);

       ibv_post_send()	posts the linked list of work requests (WRs) starting with wr to the send
       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 fail-
       ing WR through bad_wr.

       The argument wr is an ibv_send_wr struct, as defined in <infiniband/verbs.h>.

       struct ibv_send_wr {
	       uint64_t 	       wr_id;		       /* User defined WR ID */
	       struct ibv_send_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 */
	       enum ibv_wr_opcode      opcode;		       /* Operation type */
	       int		       send_flags;	       /* Flags of the WR properties */
	       uint32_t 	       imm_data;	       /* Immediate data (in network byte order) */
	       union {
		       struct {
			       uint64_t        remote_addr;    /* Start address of remote memory buffer */
			       uint32_t        rkey;	       /* Key of the remote Memory Region */
		       } rdma;
		       struct {
			       uint64_t        remote_addr;    /* Start address of remote memory buffer */
			       uint64_t        compare_add;    /* Compare operand */
			       uint64_t        swap;	       /* Swap operand */
			       uint32_t        rkey;	       /* Key of the remote Memory Region */
		       } atomic;
		       struct {
			       struct ibv_ah  *ah;	       /* Address handle (AH) for the remote node address */
			       uint32_t        remote_qpn;     /* QP number of the destination QP */
			       uint32_t        remote_qkey;    /* Q_Key number of the destination QP */
		       } ud;
	       } wr;

       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 */

       Each QP Transport Service Type supports a specific set of opcodes, as shown in the follow-
       ing table:

       IBV_WR_SEND		   |	 X	|     X      |	   X
       IBV_WR_SEND_WITH_IMM	   |	 X	|     X      |	   X
       IBV_WR_RDMA_WRITE	   |		|     X      |	   X
       IBV_WR_RDMA_WRITE_WITH_IMM  |		|     X      |	   X
       IBV_WR_RDMA_READ 	   |		|	     |	   X
       IBV_WR_ATOMIC_CMP_AND_SWP   |		|	     |	   X
       IBV_WR_ATOMIC_FETCH_AND_ADD |		|	     |	   X

       The attribute send_flags describes the properties of the WR. It is either 0 or the bitwise
       OR of one or more of the following flags:

       IBV_SEND_FENCE  Set the fence indicator. Valid only for QPs with  Transport  Service  Type

       IBV_SEND_SIGNALED  Set the completion notification indicator. Relevant only if QP was cre-
       ated with sq_sig_all=0

       IBV_SEND_SOLICITED  Set the solicited event indicator. Valid only for Send and RDMA  Write
       with immediate

       IBV_SEND_INLINE	Send data in given gather list as inline data
	      in a send WQE.  Valid only for Send and RDMA Write.  The L_Key will not be checked.

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

       The user should not alter or destroy AHs associated with WRs until request is  fully  exe-
       cuted  and  a  work  completion has been retrieved from the corresponding completion queue
       (CQ) to avoid unexpected behavior.

       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).
       However, if the IBV_SEND_INLINE flag was set, the buffer can be reused  immediately  after
       the call returns.

       ibv_create_qp(3), ibv_create_ah(3), ibv_post_recv(3), ibv_post_srq_recv(3), ibv_poll_cq(3)

       Dotan Barak <dotanba@gmail.com>

libibverbs				    2006-10-31				 IBV_POST_SEND(3)

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