126 lines
4.8 KiB
Groff
126 lines
4.8 KiB
Groff
.\" -*- nroff -*-
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.\"
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.TH IBV_POST_SEND 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
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.SH "NAME"
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ibv_post_send \- post a list of work requests (WRs) to a send queue
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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_send(struct ibv_qp " "*qp" ", struct ibv_send_wr " "*wr" ,
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.BI " struct ibv_send_wr " "**bad_wr" );
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.fi
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.SH "DESCRIPTION"
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.B ibv_post_send()
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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 send queue of the queue pair
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.I qp\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_send_wr struct, as defined in <infiniband/verbs.h>.
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.PP
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.nf
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struct ibv_send_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_send_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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enum ibv_wr_opcode opcode; /* Operation type */
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int send_flags; /* Flags of the WR properties */
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uint32_t imm_data; /* Immediate data (in network byte order) */
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union {
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.in +8
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struct {
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.in +8
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uint64_t remote_addr; /* Start address of remote memory buffer */
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uint32_t rkey; /* Key of the remote Memory Region */
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.in -8
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} rdma;
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struct {
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.in +8
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uint64_t remote_addr; /* Start address of remote memory buffer */
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uint64_t compare_add; /* Compare operand */
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uint64_t swap; /* Swap operand */
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uint32_t rkey; /* Key of the remote Memory Region */
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.in -8
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} atomic;
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struct {
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.in +8
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struct ibv_ah *ah; /* Address handle (AH) for the remote node address */
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uint32_t remote_qpn; /* QP number of the destination QP */
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uint32_t remote_qkey; /* Q_Key number of the destination QP */
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.in -8
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} ud;
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.in -8
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} wr;
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uint32_t xrc_remote_srq_num; /* SRQ number of the destination XRC */
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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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.PP
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Each QP Transport Service Type supports a specific set of opcodes, as shown in the following table:
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.PP
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.nf
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OPCODE | IBV_QPT_UD | IBV_QPT_UC | IBV_QPT_RC | IBV_QPT_XRC
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\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-
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IBV_WR_SEND | X | X | X | X
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IBV_WR_SEND_WITH_IMM | X | X | X | X
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IBV_WR_RDMA_WRITE | | X | X | X
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IBV_WR_RDMA_WRITE_WITH_IMM | | X | X | X
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IBV_WR_RDMA_READ | | | X | X
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IBV_WR_ATOMIC_CMP_AND_SWP | | | X | X
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IBV_WR_ATOMIC_FETCH_AND_ADD | | | X | X
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.fi
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.PP
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The attribute send_flags describes the properties of the \s-1WR\s0. It is either 0 or the bitwise \s-1OR\s0 of one or more of the following flags:
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.PP
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.TP
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.B IBV_SEND_FENCE \fR Set the fence indicator. Valid only for QPs with Transport Service Type \fBIBV_QPT_RC
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.TP
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.B IBV_SEND_SIGNALED \fR Set the completion notification indicator. Relevant only if QP was created with sq_sig_all=0
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.TP
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.B IBV_SEND_SOLICITED \fR Set the solicited event indicator. Valid only for Send and RDMA Write with immediate
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.TP
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.B IBV_SEND_INLINE \fR Send data in given gather list as inline data
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in a send WQE. Valid only for Send and RDMA Write. The L_Key will not be checked.
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.SH "RETURN VALUE"
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.B ibv_post_send()
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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 user should not alter or destroy AHs associated with WRs until
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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) to avoid unexpected
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behavior.
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.PP
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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). However, if the
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IBV_SEND_INLINE flag was set, the buffer can be reused immediately
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after the call returns.
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.SH "SEE ALSO"
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.BR ibv_create_qp (3),
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.BR ibv_create_xrc_rcv_qp (3),
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.BR ibv_create_ah (3),
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.BR ibv_post_recv (3),
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.BR ibv_post_srq_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 <dotanb@mellanox.co.il>
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