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