345 lines
10 KiB
C
345 lines
10 KiB
C
/*
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* Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the 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 following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/debug.h>
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#include <asm/unaligned.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <linux/sunrpc/svc_rdma.h>
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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/*
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* Decodes a read chunk list. The expected format is as follows:
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* descrim : xdr_one
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* position : __be32 offset into XDR stream
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* handle : __be32 RKEY
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* . . .
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* end-of-list: xdr_zero
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*/
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static __be32 *decode_read_list(__be32 *va, __be32 *vaend)
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{
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struct rpcrdma_read_chunk *ch = (struct rpcrdma_read_chunk *)va;
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while (ch->rc_discrim != xdr_zero) {
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if (((unsigned long)ch + sizeof(struct rpcrdma_read_chunk)) >
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(unsigned long)vaend) {
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dprintk("svcrdma: vaend=%p, ch=%p\n", vaend, ch);
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return NULL;
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}
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ch++;
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}
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return &ch->rc_position;
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}
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/*
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* Decodes a write chunk list. The expected format is as follows:
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* descrim : xdr_one
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* nchunks : <count>
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* handle : __be32 RKEY ---+
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* length : __be32 <len of segment> |
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* offset : remove va + <count>
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* . . . |
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* ---+
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*/
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static __be32 *decode_write_list(__be32 *va, __be32 *vaend)
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{
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unsigned long start, end;
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int nchunks;
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struct rpcrdma_write_array *ary =
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(struct rpcrdma_write_array *)va;
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/* Check for not write-array */
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if (ary->wc_discrim == xdr_zero)
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return &ary->wc_nchunks;
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if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
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(unsigned long)vaend) {
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dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
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return NULL;
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}
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nchunks = be32_to_cpu(ary->wc_nchunks);
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start = (unsigned long)&ary->wc_array[0];
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end = (unsigned long)vaend;
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if (nchunks < 0 ||
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nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
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(start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
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dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
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ary, nchunks, vaend);
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return NULL;
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}
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/*
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* rs_length is the 2nd 4B field in wc_target and taking its
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* address skips the list terminator
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*/
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return &ary->wc_array[nchunks].wc_target.rs_length;
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}
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static __be32 *decode_reply_array(__be32 *va, __be32 *vaend)
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{
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unsigned long start, end;
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int nchunks;
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struct rpcrdma_write_array *ary =
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(struct rpcrdma_write_array *)va;
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/* Check for no reply-array */
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if (ary->wc_discrim == xdr_zero)
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return &ary->wc_nchunks;
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if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
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(unsigned long)vaend) {
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dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
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return NULL;
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}
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nchunks = be32_to_cpu(ary->wc_nchunks);
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start = (unsigned long)&ary->wc_array[0];
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end = (unsigned long)vaend;
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if (nchunks < 0 ||
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nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
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(start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
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dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
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ary, nchunks, vaend);
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return NULL;
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}
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return (__be32 *)&ary->wc_array[nchunks];
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}
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/**
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* svc_rdma_xdr_decode_req - Parse incoming RPC-over-RDMA header
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* @rq_arg: Receive buffer
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*
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* On entry, xdr->head[0].iov_base points to first byte in the
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* RPC-over-RDMA header.
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*
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* On successful exit, head[0] points to first byte past the
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* RPC-over-RDMA header. For RDMA_MSG, this is the RPC message.
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* The length of the RPC-over-RDMA header is returned.
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*/
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int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
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{
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struct rpcrdma_msg *rmsgp;
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__be32 *va, *vaend;
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unsigned int len;
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u32 hdr_len;
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/* Verify that there's enough bytes for header + something */
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if (rq_arg->len <= RPCRDMA_HDRLEN_ERR) {
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dprintk("svcrdma: header too short = %d\n",
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rq_arg->len);
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return -EINVAL;
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}
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rmsgp = (struct rpcrdma_msg *)rq_arg->head[0].iov_base;
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if (rmsgp->rm_vers != rpcrdma_version) {
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dprintk("%s: bad version %u\n", __func__,
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be32_to_cpu(rmsgp->rm_vers));
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return -EPROTONOSUPPORT;
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}
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switch (be32_to_cpu(rmsgp->rm_type)) {
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case RDMA_MSG:
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case RDMA_NOMSG:
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break;
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case RDMA_DONE:
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/* Just drop it */
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dprintk("svcrdma: dropping RDMA_DONE message\n");
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return 0;
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case RDMA_ERROR:
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/* Possible if this is a backchannel reply.
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* XXX: We should cancel this XID, though.
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*/
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dprintk("svcrdma: dropping RDMA_ERROR message\n");
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return 0;
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case RDMA_MSGP:
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/* Pull in the extra for the padded case, bump our pointer */
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rmsgp->rm_body.rm_padded.rm_align =
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be32_to_cpu(rmsgp->rm_body.rm_padded.rm_align);
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rmsgp->rm_body.rm_padded.rm_thresh =
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be32_to_cpu(rmsgp->rm_body.rm_padded.rm_thresh);
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va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
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rq_arg->head[0].iov_base = va;
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len = (u32)((unsigned long)va - (unsigned long)rmsgp);
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rq_arg->head[0].iov_len -= len;
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if (len > rq_arg->len)
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return -EINVAL;
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return len;
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default:
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dprintk("svcrdma: bad rdma procedure (%u)\n",
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be32_to_cpu(rmsgp->rm_type));
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return -EINVAL;
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}
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/* The chunk list may contain either a read chunk list or a write
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* chunk list and a reply chunk list.
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*/
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va = &rmsgp->rm_body.rm_chunks[0];
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vaend = (__be32 *)((unsigned long)rmsgp + rq_arg->len);
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va = decode_read_list(va, vaend);
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if (!va) {
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dprintk("svcrdma: failed to decode read list\n");
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return -EINVAL;
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}
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va = decode_write_list(va, vaend);
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if (!va) {
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dprintk("svcrdma: failed to decode write list\n");
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return -EINVAL;
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}
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va = decode_reply_array(va, vaend);
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if (!va) {
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dprintk("svcrdma: failed to decode reply chunk\n");
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return -EINVAL;
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}
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rq_arg->head[0].iov_base = va;
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hdr_len = (unsigned long)va - (unsigned long)rmsgp;
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rq_arg->head[0].iov_len -= hdr_len;
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return hdr_len;
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}
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int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
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struct rpcrdma_msg *rmsgp,
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enum rpcrdma_errcode err, __be32 *va)
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{
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__be32 *startp = va;
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*va++ = rmsgp->rm_xid;
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*va++ = rmsgp->rm_vers;
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*va++ = cpu_to_be32(xprt->sc_max_requests);
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*va++ = rdma_error;
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*va++ = cpu_to_be32(err);
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if (err == ERR_VERS) {
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*va++ = rpcrdma_version;
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*va++ = rpcrdma_version;
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}
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return (int)((unsigned long)va - (unsigned long)startp);
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}
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int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp)
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{
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struct rpcrdma_write_array *wr_ary;
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/* There is no read-list in a reply */
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/* skip write list */
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wr_ary = (struct rpcrdma_write_array *)
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&rmsgp->rm_body.rm_chunks[1];
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if (wr_ary->wc_discrim)
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wr_ary = (struct rpcrdma_write_array *)
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&wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)].
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wc_target.rs_length;
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else
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wr_ary = (struct rpcrdma_write_array *)
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&wr_ary->wc_nchunks;
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/* skip reply array */
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if (wr_ary->wc_discrim)
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wr_ary = (struct rpcrdma_write_array *)
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&wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)];
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else
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wr_ary = (struct rpcrdma_write_array *)
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&wr_ary->wc_nchunks;
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return (unsigned long) wr_ary - (unsigned long) rmsgp;
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}
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void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks)
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{
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struct rpcrdma_write_array *ary;
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/* no read-list */
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rmsgp->rm_body.rm_chunks[0] = xdr_zero;
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/* write-array discrim */
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ary = (struct rpcrdma_write_array *)
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&rmsgp->rm_body.rm_chunks[1];
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ary->wc_discrim = xdr_one;
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ary->wc_nchunks = cpu_to_be32(chunks);
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/* write-list terminator */
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ary->wc_array[chunks].wc_target.rs_handle = xdr_zero;
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/* reply-array discriminator */
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ary->wc_array[chunks].wc_target.rs_length = xdr_zero;
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}
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void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *ary,
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int chunks)
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{
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ary->wc_discrim = xdr_one;
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ary->wc_nchunks = cpu_to_be32(chunks);
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}
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void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
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int chunk_no,
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__be32 rs_handle,
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__be64 rs_offset,
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u32 write_len)
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{
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struct rpcrdma_segment *seg = &ary->wc_array[chunk_no].wc_target;
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seg->rs_handle = rs_handle;
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seg->rs_offset = rs_offset;
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seg->rs_length = cpu_to_be32(write_len);
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}
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void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *xprt,
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struct rpcrdma_msg *rdma_argp,
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struct rpcrdma_msg *rdma_resp,
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enum rpcrdma_proc rdma_type)
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{
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rdma_resp->rm_xid = rdma_argp->rm_xid;
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rdma_resp->rm_vers = rdma_argp->rm_vers;
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rdma_resp->rm_credit = cpu_to_be32(xprt->sc_max_requests);
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rdma_resp->rm_type = cpu_to_be32(rdma_type);
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/* Encode <nul> chunks lists */
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rdma_resp->rm_body.rm_chunks[0] = xdr_zero;
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rdma_resp->rm_body.rm_chunks[1] = xdr_zero;
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rdma_resp->rm_body.rm_chunks[2] = xdr_zero;
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}
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