Implement NFS RDMA support
This commit is contained in:
Vitaliy Filippov
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/* RFC 8166 - Remote Direct Memory Access Transport for Remote Procedure Call Version 1 */
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/*
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* Copyright (c) 2010-2017 IETF Trust and the persons
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* identified as authors of the code. All rights reserved.
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*
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* The authors of the code are:
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* B. Callaghan, T. Talpey, and C. Lever
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*
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* Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the
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* following conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* - Neither the name of Internet Society, IETF or IETF
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* Trust, nor the names of specific contributors, may be
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* used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Plain RDMA segment (Section 3.4.3)
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*/
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struct xdr_rdma_segment {
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uint32_t handle; /* Registered memory handle */
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uint32_t length; /* Length of the chunk in bytes */
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uint64_t offset; /* Chunk virtual address or offset */
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};
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/*
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* RDMA read segment (Section 3.4.5)
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*/
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struct xdr_read_chunk {
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uint32_t position; /* Position in XDR stream */
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struct xdr_rdma_segment target;
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};
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/*
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* Read list (Section 4.3.1)
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*/
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struct xdr_read_list {
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struct xdr_read_chunk entry;
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struct xdr_read_list *next;
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};
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/*
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* Write chunk (Section 3.4.6)
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*/
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struct xdr_write_chunk {
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struct xdr_rdma_segment target<>;
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};
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/*
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* Write list (Section 4.3.2)
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*/
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struct xdr_write_list {
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struct xdr_write_chunk entry;
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struct xdr_write_list *next;
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};
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/*
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* Chunk lists (Section 4.3)
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*/
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struct rpc_rdma_header {
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struct xdr_read_list *rdma_reads;
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struct xdr_write_list *rdma_writes;
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struct xdr_write_chunk *rdma_reply;
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/* rpc body follows */
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};
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struct rpc_rdma_header_nomsg {
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struct xdr_read_list *rdma_reads;
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struct xdr_write_list *rdma_writes;
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struct xdr_write_chunk *rdma_reply;
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};
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/* Not to be used */
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struct rpc_rdma_header_padded {
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uint32_t rdma_align;
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uint32_t rdma_thresh;
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struct xdr_read_list *rdma_reads;
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struct xdr_write_list *rdma_writes;
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struct xdr_write_chunk *rdma_reply;
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/* rpc body follows */
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};
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/*
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* Error handling (Section 4.5)
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*/
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enum rpc_rdma_errcode {
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ERR_VERS = 1, /* Value fixed for all versions */
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ERR_CHUNK = 2
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};
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/* Structure fixed for all versions */
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struct rpc_rdma_errvers {
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uint32_t rdma_vers_low;
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uint32_t rdma_vers_high;
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};
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union rpc_rdma_error switch (rpc_rdma_errcode err) {
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case ERR_VERS:
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rpc_rdma_errvers range;
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case ERR_CHUNK:
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void;
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};
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/*
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* Procedures (Section 4.2.4)
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*/
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enum rdma_proc {
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RDMA_MSG = 0, /* Value fixed for all versions */
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RDMA_NOMSG = 1, /* Value fixed for all versions */
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RDMA_MSGP = 2, /* Not to be used */
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RDMA_DONE = 3, /* Not to be used */
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RDMA_ERROR = 4 /* Value fixed for all versions */
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};
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/* The position of the proc discriminator field is
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* fixed for all versions */
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union rdma_body switch (rdma_proc proc) {
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case RDMA_MSG:
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rpc_rdma_header rdma_msg;
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case RDMA_NOMSG:
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rpc_rdma_header_nomsg rdma_nomsg;
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case RDMA_MSGP: /* Not to be used */
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rpc_rdma_header_padded rdma_msgp;
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case RDMA_DONE: /* Not to be used */
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void;
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case RDMA_ERROR:
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rpc_rdma_error rdma_error;
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};
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/*
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* Fixed header fields (Section 4.2)
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*/
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struct rdma_msg {
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uint32_t rdma_xid; /* Position fixed for all versions */
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uint32_t rdma_vers; /* Position fixed for all versions */
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uint32_t rdma_credit; /* Position fixed for all versions */
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rdma_body rdma_body;
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};
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