sunrpc/xprtrdma/svc_rdma_sendto.c

53  * a Send WR conveying the transport header and the RPC message itself to
68  * The logic here depends on Send Queue and completion ordering. Since
69  * the Send WR is always posted last, it will always complete last. Thus
78  * When the Send WR is constructed, it also gets its own svc_rdma_send_ctxt.
80  * ctxt, the Send WR is posted, and sendto returns.
82  * The svc_rdma_send_ctxt is presented when the Send WR completes. The
83  * Send completion handler finally releases the Reply's pages.
85  * This mechanism also assumes that completions on the transport's Send
87  * and Send completion running at the same time could release pages that
92  * - If the Send WR is posted successfully, it will either complete
93  *   successfully, or get flushed. Either way, the Send completion
95  * - If the Send WR cannot be not posted, the forward path releases
99  * where two different Write segments send portions of the same page.
269  * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC
274  * the Send completion handler could be running.
297  * svc_rdma_send - Post a single Send WR
299  * @ctxt: send ctxt with a Send WR ready to post
301  * Returns zero the Send WR was posted successfully. Otherwise, a
346  * @sctxt: Send context for the RPC Reply
362  * @sctxt: Send context for the RPC Reply
402  * @sctxt: Send context for the RPC Reply
450  * @sctxt: Send context for the RPC Reply
489  * @sctxt: Send context for the RPC Reply
547  * @sctxt: send_ctxt for the Send WR
568 	 * fit in a single RDMA Send.  in svc_rdma_pull_up_needed()
599  * @sctxt: send_ctxt for the Send WR; xprt hdr is already prepared
659  * @sctxt: send_ctxt for the Send WR
664  * element as it is added. The Send WR's num_sge field is set.
752  * so they are released by the Send completion handler.
770  * via RDMA Send. The RPC-over-RDMA transport header is prepared
774  * the server may send all, a portion of, or none of the xdr_buf.
778  * RDMA Send is the last step of transmitting an RPC reply. Pages
781  * DMA unmapped by each Write completion, but the subsequent Send
810  * svc_rdma_send_error_msg - Send an RPC/RDMA v1 error response
812  * @sctxt: Send context for the response
822  * Send completion, or by this function on error.
966 	/* Send completion releases payload pages that were part  in svc_rdma_sendto()
991  * we actually send the payload.