mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 09:31:50 +00:00
ef1eac0a3f
This logic parses the ONCRDMA protocol headers that precede the actual RPC header. It is placed in a separate file to keep all protocol aware code in a single place. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
413 lines
12 KiB
C
413 lines
12 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 : u32 offset into XDR stream
|
|
* handle : u32 RKEY
|
|
* . . .
|
|
* end-of-list: xdr_zero
|
|
*/
|
|
static u32 *decode_read_list(u32 *va, u32 *vaend)
|
|
{
|
|
struct rpcrdma_read_chunk *ch = (struct rpcrdma_read_chunk *)va;
|
|
|
|
while (ch->rc_discrim != xdr_zero) {
|
|
u64 ch_offset;
|
|
|
|
if (((unsigned long)ch + sizeof(struct rpcrdma_read_chunk)) >
|
|
(unsigned long)vaend) {
|
|
dprintk("svcrdma: vaend=%p, ch=%p\n", vaend, ch);
|
|
return NULL;
|
|
}
|
|
|
|
ch->rc_discrim = ntohl(ch->rc_discrim);
|
|
ch->rc_position = ntohl(ch->rc_position);
|
|
ch->rc_target.rs_handle = ntohl(ch->rc_target.rs_handle);
|
|
ch->rc_target.rs_length = ntohl(ch->rc_target.rs_length);
|
|
va = (u32 *)&ch->rc_target.rs_offset;
|
|
xdr_decode_hyper(va, &ch_offset);
|
|
put_unaligned(ch_offset, (u64 *)va);
|
|
ch++;
|
|
}
|
|
return (u32 *)&ch->rc_position;
|
|
}
|
|
|
|
/*
|
|
* Determine number of chunks and total bytes in chunk list. The chunk
|
|
* list has already been verified to fit within the RPCRDMA header.
|
|
*/
|
|
void svc_rdma_rcl_chunk_counts(struct rpcrdma_read_chunk *ch,
|
|
int *ch_count, int *byte_count)
|
|
{
|
|
/* compute the number of bytes represented by read chunks */
|
|
*byte_count = 0;
|
|
*ch_count = 0;
|
|
for (; ch->rc_discrim != 0; ch++) {
|
|
*byte_count = *byte_count + ch->rc_target.rs_length;
|
|
*ch_count = *ch_count + 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Decodes a write chunk list. The expected format is as follows:
|
|
* descrim : xdr_one
|
|
* nchunks : <count>
|
|
* handle : u32 RKEY ---+
|
|
* length : u32 <len of segment> |
|
|
* offset : remove va + <count>
|
|
* . . . |
|
|
* ---+
|
|
*/
|
|
static u32 *decode_write_list(u32 *va, u32 *vaend)
|
|
{
|
|
int ch_no;
|
|
struct rpcrdma_write_array *ary =
|
|
(struct rpcrdma_write_array *)va;
|
|
|
|
/* Check for not write-array */
|
|
if (ary->wc_discrim == xdr_zero)
|
|
return (u32 *)&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;
|
|
}
|
|
ary->wc_discrim = ntohl(ary->wc_discrim);
|
|
ary->wc_nchunks = ntohl(ary->wc_nchunks);
|
|
if (((unsigned long)&ary->wc_array[0] +
|
|
(sizeof(struct rpcrdma_write_chunk) * ary->wc_nchunks)) >
|
|
(unsigned long)vaend) {
|
|
dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
|
|
ary, ary->wc_nchunks, vaend);
|
|
return NULL;
|
|
}
|
|
for (ch_no = 0; ch_no < ary->wc_nchunks; ch_no++) {
|
|
u64 ch_offset;
|
|
|
|
ary->wc_array[ch_no].wc_target.rs_handle =
|
|
ntohl(ary->wc_array[ch_no].wc_target.rs_handle);
|
|
ary->wc_array[ch_no].wc_target.rs_length =
|
|
ntohl(ary->wc_array[ch_no].wc_target.rs_length);
|
|
va = (u32 *)&ary->wc_array[ch_no].wc_target.rs_offset;
|
|
xdr_decode_hyper(va, &ch_offset);
|
|
put_unaligned(ch_offset, (u64 *)va);
|
|
}
|
|
|
|
/*
|
|
* rs_length is the 2nd 4B field in wc_target and taking its
|
|
* address skips the list terminator
|
|
*/
|
|
return (u32 *)&ary->wc_array[ch_no].wc_target.rs_length;
|
|
}
|
|
|
|
static u32 *decode_reply_array(u32 *va, u32 *vaend)
|
|
{
|
|
int ch_no;
|
|
struct rpcrdma_write_array *ary =
|
|
(struct rpcrdma_write_array *)va;
|
|
|
|
/* Check for no reply-array */
|
|
if (ary->wc_discrim == xdr_zero)
|
|
return (u32 *)&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;
|
|
}
|
|
ary->wc_discrim = ntohl(ary->wc_discrim);
|
|
ary->wc_nchunks = ntohl(ary->wc_nchunks);
|
|
if (((unsigned long)&ary->wc_array[0] +
|
|
(sizeof(struct rpcrdma_write_chunk) * ary->wc_nchunks)) >
|
|
(unsigned long)vaend) {
|
|
dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
|
|
ary, ary->wc_nchunks, vaend);
|
|
return NULL;
|
|
}
|
|
for (ch_no = 0; ch_no < ary->wc_nchunks; ch_no++) {
|
|
u64 ch_offset;
|
|
|
|
ary->wc_array[ch_no].wc_target.rs_handle =
|
|
ntohl(ary->wc_array[ch_no].wc_target.rs_handle);
|
|
ary->wc_array[ch_no].wc_target.rs_length =
|
|
ntohl(ary->wc_array[ch_no].wc_target.rs_length);
|
|
va = (u32 *)&ary->wc_array[ch_no].wc_target.rs_offset;
|
|
xdr_decode_hyper(va, &ch_offset);
|
|
put_unaligned(ch_offset, (u64 *)va);
|
|
}
|
|
|
|
return (u32 *)&ary->wc_array[ch_no];
|
|
}
|
|
|
|
int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req,
|
|
struct svc_rqst *rqstp)
|
|
{
|
|
struct rpcrdma_msg *rmsgp = NULL;
|
|
u32 *va;
|
|
u32 *vaend;
|
|
u32 hdr_len;
|
|
|
|
rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
|
|
|
|
/* Verify that there's enough bytes for header + something */
|
|
if (rqstp->rq_arg.len <= RPCRDMA_HDRLEN_MIN) {
|
|
dprintk("svcrdma: header too short = %d\n",
|
|
rqstp->rq_arg.len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Decode the header */
|
|
rmsgp->rm_xid = ntohl(rmsgp->rm_xid);
|
|
rmsgp->rm_vers = ntohl(rmsgp->rm_vers);
|
|
rmsgp->rm_credit = ntohl(rmsgp->rm_credit);
|
|
rmsgp->rm_type = ntohl(rmsgp->rm_type);
|
|
|
|
if (rmsgp->rm_vers != RPCRDMA_VERSION)
|
|
return -ENOSYS;
|
|
|
|
/* Pull in the extra for the padded case and bump our pointer */
|
|
if (rmsgp->rm_type == RDMA_MSGP) {
|
|
int hdrlen;
|
|
rmsgp->rm_body.rm_padded.rm_align =
|
|
ntohl(rmsgp->rm_body.rm_padded.rm_align);
|
|
rmsgp->rm_body.rm_padded.rm_thresh =
|
|
ntohl(rmsgp->rm_body.rm_padded.rm_thresh);
|
|
|
|
va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
|
|
rqstp->rq_arg.head[0].iov_base = va;
|
|
hdrlen = (u32)((unsigned long)va - (unsigned long)rmsgp);
|
|
rqstp->rq_arg.head[0].iov_len -= hdrlen;
|
|
if (hdrlen > rqstp->rq_arg.len)
|
|
return -EINVAL;
|
|
return hdrlen;
|
|
}
|
|
|
|
/* 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 = (u32 *)((unsigned long)rmsgp + rqstp->rq_arg.len);
|
|
va = decode_read_list(va, vaend);
|
|
if (!va)
|
|
return -EINVAL;
|
|
va = decode_write_list(va, vaend);
|
|
if (!va)
|
|
return -EINVAL;
|
|
va = decode_reply_array(va, vaend);
|
|
if (!va)
|
|
return -EINVAL;
|
|
|
|
rqstp->rq_arg.head[0].iov_base = va;
|
|
hdr_len = (unsigned long)va - (unsigned long)rmsgp;
|
|
rqstp->rq_arg.head[0].iov_len -= hdr_len;
|
|
|
|
*rdma_req = rmsgp;
|
|
return hdr_len;
|
|
}
|
|
|
|
int svc_rdma_xdr_decode_deferred_req(struct svc_rqst *rqstp)
|
|
{
|
|
struct rpcrdma_msg *rmsgp = NULL;
|
|
struct rpcrdma_read_chunk *ch;
|
|
struct rpcrdma_write_array *ary;
|
|
u32 *va;
|
|
u32 hdrlen;
|
|
|
|
dprintk("svcrdma: processing deferred RDMA header on rqstp=%p\n",
|
|
rqstp);
|
|
rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
|
|
|
|
/* Pull in the extra for the padded case and bump our pointer */
|
|
if (rmsgp->rm_type == RDMA_MSGP) {
|
|
va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
|
|
rqstp->rq_arg.head[0].iov_base = va;
|
|
hdrlen = (u32)((unsigned long)va - (unsigned long)rmsgp);
|
|
rqstp->rq_arg.head[0].iov_len -= hdrlen;
|
|
return hdrlen;
|
|
}
|
|
|
|
/*
|
|
* Skip all chunks to find RPC msg. These were previously processed
|
|
*/
|
|
va = &rmsgp->rm_body.rm_chunks[0];
|
|
|
|
/* Skip read-list */
|
|
for (ch = (struct rpcrdma_read_chunk *)va;
|
|
ch->rc_discrim != xdr_zero; ch++);
|
|
va = (u32 *)&ch->rc_position;
|
|
|
|
/* Skip write-list */
|
|
ary = (struct rpcrdma_write_array *)va;
|
|
if (ary->wc_discrim == xdr_zero)
|
|
va = (u32 *)&ary->wc_nchunks;
|
|
else
|
|
/*
|
|
* rs_length is the 2nd 4B field in wc_target and taking its
|
|
* address skips the list terminator
|
|
*/
|
|
va = (u32 *)&ary->wc_array[ary->wc_nchunks].wc_target.rs_length;
|
|
|
|
/* Skip reply-array */
|
|
ary = (struct rpcrdma_write_array *)va;
|
|
if (ary->wc_discrim == xdr_zero)
|
|
va = (u32 *)&ary->wc_nchunks;
|
|
else
|
|
va = (u32 *)&ary->wc_array[ary->wc_nchunks];
|
|
|
|
rqstp->rq_arg.head[0].iov_base = va;
|
|
hdrlen = (unsigned long)va - (unsigned long)rmsgp;
|
|
rqstp->rq_arg.head[0].iov_len -= hdrlen;
|
|
|
|
return hdrlen;
|
|
}
|
|
|
|
int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
|
|
struct rpcrdma_msg *rmsgp,
|
|
enum rpcrdma_errcode err, u32 *va)
|
|
{
|
|
u32 *startp = va;
|
|
|
|
*va++ = htonl(rmsgp->rm_xid);
|
|
*va++ = htonl(rmsgp->rm_vers);
|
|
*va++ = htonl(xprt->sc_max_requests);
|
|
*va++ = htonl(RDMA_ERROR);
|
|
*va++ = htonl(err);
|
|
if (err == ERR_VERS) {
|
|
*va++ = htonl(RPCRDMA_VERSION);
|
|
*va++ = htonl(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[ntohl(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[ntohl(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 = htonl(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 = htonl(chunks);
|
|
}
|
|
|
|
void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
|
|
int chunk_no,
|
|
u32 rs_handle, u64 rs_offset,
|
|
u32 write_len)
|
|
{
|
|
struct rpcrdma_segment *seg = &ary->wc_array[chunk_no].wc_target;
|
|
seg->rs_handle = htonl(rs_handle);
|
|
seg->rs_length = htonl(write_len);
|
|
xdr_encode_hyper((u32 *) &seg->rs_offset, rs_offset);
|
|
}
|
|
|
|
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 = htonl(rdma_argp->rm_xid);
|
|
rdma_resp->rm_vers = htonl(rdma_argp->rm_vers);
|
|
rdma_resp->rm_credit = htonl(xprt->sc_max_requests);
|
|
rdma_resp->rm_type = htonl(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;
|
|
}
|