af901ca181
That is "success", "unknown", "through", "performance", "[re|un]mapping" , "access", "default", "reasonable", "[con]currently", "temperature" , "channel", "[un]used", "application", "example","hierarchy", "therefore" , "[over|under]flow", "contiguous", "threshold", "enough" and others. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
705 lines
20 KiB
C
705 lines
20 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/debug.h>
|
|
#include <linux/sunrpc/rpc_rdma.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/unaligned.h>
|
|
#include <rdma/ib_verbs.h>
|
|
#include <rdma/rdma_cm.h>
|
|
#include <linux/sunrpc/svc_rdma.h>
|
|
|
|
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
|
|
|
|
/* Encode an XDR as an array of IB SGE
|
|
*
|
|
* Assumptions:
|
|
* - head[0] is physically contiguous.
|
|
* - tail[0] is physically contiguous.
|
|
* - pages[] is not physically or virtually contiguous and consists of
|
|
* PAGE_SIZE elements.
|
|
*
|
|
* Output:
|
|
* SGE[0] reserved for RCPRDMA header
|
|
* SGE[1] data from xdr->head[]
|
|
* SGE[2..sge_count-2] data from xdr->pages[]
|
|
* SGE[sge_count-1] data from xdr->tail.
|
|
*
|
|
* The max SGE we need is the length of the XDR / pagesize + one for
|
|
* head + one for tail + one for RPCRDMA header. Since RPCSVC_MAXPAGES
|
|
* reserves a page for both the request and the reply header, and this
|
|
* array is only concerned with the reply we are assured that we have
|
|
* on extra page for the RPCRMDA header.
|
|
*/
|
|
static int fast_reg_xdr(struct svcxprt_rdma *xprt,
|
|
struct xdr_buf *xdr,
|
|
struct svc_rdma_req_map *vec)
|
|
{
|
|
int sge_no;
|
|
u32 sge_bytes;
|
|
u32 page_bytes;
|
|
u32 page_off;
|
|
int page_no = 0;
|
|
u8 *frva;
|
|
struct svc_rdma_fastreg_mr *frmr;
|
|
|
|
frmr = svc_rdma_get_frmr(xprt);
|
|
if (IS_ERR(frmr))
|
|
return -ENOMEM;
|
|
vec->frmr = frmr;
|
|
|
|
/* Skip the RPCRDMA header */
|
|
sge_no = 1;
|
|
|
|
/* Map the head. */
|
|
frva = (void *)((unsigned long)(xdr->head[0].iov_base) & PAGE_MASK);
|
|
vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
|
|
vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
|
|
vec->count = 2;
|
|
sge_no++;
|
|
|
|
/* Build the FRMR */
|
|
frmr->kva = frva;
|
|
frmr->direction = DMA_TO_DEVICE;
|
|
frmr->access_flags = 0;
|
|
frmr->map_len = PAGE_SIZE;
|
|
frmr->page_list_len = 1;
|
|
frmr->page_list->page_list[page_no] =
|
|
ib_dma_map_single(xprt->sc_cm_id->device,
|
|
(void *)xdr->head[0].iov_base,
|
|
PAGE_SIZE, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
|
|
frmr->page_list->page_list[page_no]))
|
|
goto fatal_err;
|
|
atomic_inc(&xprt->sc_dma_used);
|
|
|
|
page_off = xdr->page_base;
|
|
page_bytes = xdr->page_len + page_off;
|
|
if (!page_bytes)
|
|
goto encode_tail;
|
|
|
|
/* Map the pages */
|
|
vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
|
|
vec->sge[sge_no].iov_len = page_bytes;
|
|
sge_no++;
|
|
while (page_bytes) {
|
|
struct page *page;
|
|
|
|
page = xdr->pages[page_no++];
|
|
sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
|
|
page_bytes -= sge_bytes;
|
|
|
|
frmr->page_list->page_list[page_no] =
|
|
ib_dma_map_single(xprt->sc_cm_id->device,
|
|
page_address(page),
|
|
PAGE_SIZE, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
|
|
frmr->page_list->page_list[page_no]))
|
|
goto fatal_err;
|
|
|
|
atomic_inc(&xprt->sc_dma_used);
|
|
page_off = 0; /* reset for next time through loop */
|
|
frmr->map_len += PAGE_SIZE;
|
|
frmr->page_list_len++;
|
|
}
|
|
vec->count++;
|
|
|
|
encode_tail:
|
|
/* Map tail */
|
|
if (0 == xdr->tail[0].iov_len)
|
|
goto done;
|
|
|
|
vec->count++;
|
|
vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
|
|
|
|
if (((unsigned long)xdr->tail[0].iov_base & PAGE_MASK) ==
|
|
((unsigned long)xdr->head[0].iov_base & PAGE_MASK)) {
|
|
/*
|
|
* If head and tail use the same page, we don't need
|
|
* to map it again.
|
|
*/
|
|
vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
|
|
} else {
|
|
void *va;
|
|
|
|
/* Map another page for the tail */
|
|
page_off = (unsigned long)xdr->tail[0].iov_base & ~PAGE_MASK;
|
|
va = (void *)((unsigned long)xdr->tail[0].iov_base & PAGE_MASK);
|
|
vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
|
|
|
|
frmr->page_list->page_list[page_no] =
|
|
ib_dma_map_single(xprt->sc_cm_id->device, va, PAGE_SIZE,
|
|
DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
|
|
frmr->page_list->page_list[page_no]))
|
|
goto fatal_err;
|
|
atomic_inc(&xprt->sc_dma_used);
|
|
frmr->map_len += PAGE_SIZE;
|
|
frmr->page_list_len++;
|
|
}
|
|
|
|
done:
|
|
if (svc_rdma_fastreg(xprt, frmr))
|
|
goto fatal_err;
|
|
|
|
return 0;
|
|
|
|
fatal_err:
|
|
printk("svcrdma: Error fast registering memory for xprt %p\n", xprt);
|
|
vec->frmr = NULL;
|
|
svc_rdma_put_frmr(xprt, frmr);
|
|
return -EIO;
|
|
}
|
|
|
|
static int map_xdr(struct svcxprt_rdma *xprt,
|
|
struct xdr_buf *xdr,
|
|
struct svc_rdma_req_map *vec)
|
|
{
|
|
int sge_no;
|
|
u32 sge_bytes;
|
|
u32 page_bytes;
|
|
u32 page_off;
|
|
int page_no;
|
|
|
|
BUG_ON(xdr->len !=
|
|
(xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len));
|
|
|
|
if (xprt->sc_frmr_pg_list_len)
|
|
return fast_reg_xdr(xprt, xdr, vec);
|
|
|
|
/* Skip the first sge, this is for the RPCRDMA header */
|
|
sge_no = 1;
|
|
|
|
/* Head SGE */
|
|
vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
|
|
vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
|
|
sge_no++;
|
|
|
|
/* pages SGE */
|
|
page_no = 0;
|
|
page_bytes = xdr->page_len;
|
|
page_off = xdr->page_base;
|
|
while (page_bytes) {
|
|
vec->sge[sge_no].iov_base =
|
|
page_address(xdr->pages[page_no]) + page_off;
|
|
sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
|
|
page_bytes -= sge_bytes;
|
|
vec->sge[sge_no].iov_len = sge_bytes;
|
|
|
|
sge_no++;
|
|
page_no++;
|
|
page_off = 0; /* reset for next time through loop */
|
|
}
|
|
|
|
/* Tail SGE */
|
|
if (xdr->tail[0].iov_len) {
|
|
vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
|
|
vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
|
|
sge_no++;
|
|
}
|
|
|
|
dprintk("svcrdma: map_xdr: sge_no %d page_no %d "
|
|
"page_base %u page_len %u head_len %zu tail_len %zu\n",
|
|
sge_no, page_no, xdr->page_base, xdr->page_len,
|
|
xdr->head[0].iov_len, xdr->tail[0].iov_len);
|
|
|
|
vec->count = sge_no;
|
|
return 0;
|
|
}
|
|
|
|
/* Assumptions:
|
|
* - We are using FRMR
|
|
* - or -
|
|
* - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
|
|
*/
|
|
static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
|
|
u32 rmr, u64 to,
|
|
u32 xdr_off, int write_len,
|
|
struct svc_rdma_req_map *vec)
|
|
{
|
|
struct ib_send_wr write_wr;
|
|
struct ib_sge *sge;
|
|
int xdr_sge_no;
|
|
int sge_no;
|
|
int sge_bytes;
|
|
int sge_off;
|
|
int bc;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
|
|
BUG_ON(vec->count > RPCSVC_MAXPAGES);
|
|
dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
|
|
"write_len=%d, vec->sge=%p, vec->count=%lu\n",
|
|
rmr, (unsigned long long)to, xdr_off,
|
|
write_len, vec->sge, vec->count);
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
ctxt->direction = DMA_TO_DEVICE;
|
|
sge = ctxt->sge;
|
|
|
|
/* Find the SGE associated with xdr_off */
|
|
for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
|
|
xdr_sge_no++) {
|
|
if (vec->sge[xdr_sge_no].iov_len > bc)
|
|
break;
|
|
bc -= vec->sge[xdr_sge_no].iov_len;
|
|
}
|
|
|
|
sge_off = bc;
|
|
bc = write_len;
|
|
sge_no = 0;
|
|
|
|
/* Copy the remaining SGE */
|
|
while (bc != 0) {
|
|
sge_bytes = min_t(size_t,
|
|
bc, vec->sge[xdr_sge_no].iov_len-sge_off);
|
|
sge[sge_no].length = sge_bytes;
|
|
if (!vec->frmr) {
|
|
sge[sge_no].addr =
|
|
ib_dma_map_single(xprt->sc_cm_id->device,
|
|
(void *)
|
|
vec->sge[xdr_sge_no].iov_base + sge_off,
|
|
sge_bytes, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
|
|
sge[sge_no].addr))
|
|
goto err;
|
|
atomic_inc(&xprt->sc_dma_used);
|
|
sge[sge_no].lkey = xprt->sc_dma_lkey;
|
|
} else {
|
|
sge[sge_no].addr = (unsigned long)
|
|
vec->sge[xdr_sge_no].iov_base + sge_off;
|
|
sge[sge_no].lkey = vec->frmr->mr->lkey;
|
|
}
|
|
ctxt->count++;
|
|
ctxt->frmr = vec->frmr;
|
|
sge_off = 0;
|
|
sge_no++;
|
|
xdr_sge_no++;
|
|
BUG_ON(xdr_sge_no > vec->count);
|
|
bc -= sge_bytes;
|
|
}
|
|
|
|
/* Prepare WRITE WR */
|
|
memset(&write_wr, 0, sizeof write_wr);
|
|
ctxt->wr_op = IB_WR_RDMA_WRITE;
|
|
write_wr.wr_id = (unsigned long)ctxt;
|
|
write_wr.sg_list = &sge[0];
|
|
write_wr.num_sge = sge_no;
|
|
write_wr.opcode = IB_WR_RDMA_WRITE;
|
|
write_wr.send_flags = IB_SEND_SIGNALED;
|
|
write_wr.wr.rdma.rkey = rmr;
|
|
write_wr.wr.rdma.remote_addr = to;
|
|
|
|
/* Post It */
|
|
atomic_inc(&rdma_stat_write);
|
|
if (svc_rdma_send(xprt, &write_wr))
|
|
goto err;
|
|
return 0;
|
|
err:
|
|
svc_rdma_put_context(ctxt, 0);
|
|
/* Fatal error, close transport */
|
|
return -EIO;
|
|
}
|
|
|
|
static int send_write_chunks(struct svcxprt_rdma *xprt,
|
|
struct rpcrdma_msg *rdma_argp,
|
|
struct rpcrdma_msg *rdma_resp,
|
|
struct svc_rqst *rqstp,
|
|
struct svc_rdma_req_map *vec)
|
|
{
|
|
u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
|
|
int write_len;
|
|
int max_write;
|
|
u32 xdr_off;
|
|
int chunk_off;
|
|
int chunk_no;
|
|
struct rpcrdma_write_array *arg_ary;
|
|
struct rpcrdma_write_array *res_ary;
|
|
int ret;
|
|
|
|
arg_ary = svc_rdma_get_write_array(rdma_argp);
|
|
if (!arg_ary)
|
|
return 0;
|
|
res_ary = (struct rpcrdma_write_array *)
|
|
&rdma_resp->rm_body.rm_chunks[1];
|
|
|
|
if (vec->frmr)
|
|
max_write = vec->frmr->map_len;
|
|
else
|
|
max_write = xprt->sc_max_sge * PAGE_SIZE;
|
|
|
|
/* Write chunks start at the pagelist */
|
|
for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
|
|
xfer_len && chunk_no < arg_ary->wc_nchunks;
|
|
chunk_no++) {
|
|
struct rpcrdma_segment *arg_ch;
|
|
u64 rs_offset;
|
|
|
|
arg_ch = &arg_ary->wc_array[chunk_no].wc_target;
|
|
write_len = min(xfer_len, arg_ch->rs_length);
|
|
|
|
/* Prepare the response chunk given the length actually
|
|
* written */
|
|
rs_offset = get_unaligned(&(arg_ch->rs_offset));
|
|
svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
|
|
arg_ch->rs_handle,
|
|
rs_offset,
|
|
write_len);
|
|
chunk_off = 0;
|
|
while (write_len) {
|
|
int this_write;
|
|
this_write = min(write_len, max_write);
|
|
ret = send_write(xprt, rqstp,
|
|
arg_ch->rs_handle,
|
|
rs_offset + chunk_off,
|
|
xdr_off,
|
|
this_write,
|
|
vec);
|
|
if (ret) {
|
|
dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
|
|
ret);
|
|
return -EIO;
|
|
}
|
|
chunk_off += this_write;
|
|
xdr_off += this_write;
|
|
xfer_len -= this_write;
|
|
write_len -= this_write;
|
|
}
|
|
}
|
|
/* Update the req with the number of chunks actually used */
|
|
svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no);
|
|
|
|
return rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
|
|
}
|
|
|
|
static int send_reply_chunks(struct svcxprt_rdma *xprt,
|
|
struct rpcrdma_msg *rdma_argp,
|
|
struct rpcrdma_msg *rdma_resp,
|
|
struct svc_rqst *rqstp,
|
|
struct svc_rdma_req_map *vec)
|
|
{
|
|
u32 xfer_len = rqstp->rq_res.len;
|
|
int write_len;
|
|
int max_write;
|
|
u32 xdr_off;
|
|
int chunk_no;
|
|
int chunk_off;
|
|
struct rpcrdma_segment *ch;
|
|
struct rpcrdma_write_array *arg_ary;
|
|
struct rpcrdma_write_array *res_ary;
|
|
int ret;
|
|
|
|
arg_ary = svc_rdma_get_reply_array(rdma_argp);
|
|
if (!arg_ary)
|
|
return 0;
|
|
/* XXX: need to fix when reply lists occur with read-list and or
|
|
* write-list */
|
|
res_ary = (struct rpcrdma_write_array *)
|
|
&rdma_resp->rm_body.rm_chunks[2];
|
|
|
|
if (vec->frmr)
|
|
max_write = vec->frmr->map_len;
|
|
else
|
|
max_write = xprt->sc_max_sge * PAGE_SIZE;
|
|
|
|
/* xdr offset starts at RPC message */
|
|
for (xdr_off = 0, chunk_no = 0;
|
|
xfer_len && chunk_no < arg_ary->wc_nchunks;
|
|
chunk_no++) {
|
|
u64 rs_offset;
|
|
ch = &arg_ary->wc_array[chunk_no].wc_target;
|
|
write_len = min(xfer_len, ch->rs_length);
|
|
|
|
/* Prepare the reply chunk given the length actually
|
|
* written */
|
|
rs_offset = get_unaligned(&(ch->rs_offset));
|
|
svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
|
|
ch->rs_handle, rs_offset,
|
|
write_len);
|
|
chunk_off = 0;
|
|
while (write_len) {
|
|
int this_write;
|
|
|
|
this_write = min(write_len, max_write);
|
|
ret = send_write(xprt, rqstp,
|
|
ch->rs_handle,
|
|
rs_offset + chunk_off,
|
|
xdr_off,
|
|
this_write,
|
|
vec);
|
|
if (ret) {
|
|
dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
|
|
ret);
|
|
return -EIO;
|
|
}
|
|
chunk_off += this_write;
|
|
xdr_off += this_write;
|
|
xfer_len -= this_write;
|
|
write_len -= this_write;
|
|
}
|
|
}
|
|
/* Update the req with the number of chunks actually used */
|
|
svc_rdma_xdr_encode_reply_array(res_ary, chunk_no);
|
|
|
|
return rqstp->rq_res.len;
|
|
}
|
|
|
|
/* This function prepares the portion of the RPCRDMA message to be
|
|
* sent in the RDMA_SEND. This function is called after data sent via
|
|
* RDMA has already been transmitted. There are three cases:
|
|
* - The RPCRDMA header, RPC header, and payload are all sent in a
|
|
* single RDMA_SEND. This is the "inline" case.
|
|
* - The RPCRDMA header and some portion of the RPC header and data
|
|
* are sent via this RDMA_SEND and another portion of the data is
|
|
* sent via RDMA.
|
|
* - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC
|
|
* header and data are all transmitted via RDMA.
|
|
* In all three cases, this function prepares the RPCRDMA header in
|
|
* sge[0], the 'type' parameter indicates the type to place in the
|
|
* RPCRDMA header, and the 'byte_count' field indicates how much of
|
|
* the XDR to include in this RDMA_SEND.
|
|
*/
|
|
static int send_reply(struct svcxprt_rdma *rdma,
|
|
struct svc_rqst *rqstp,
|
|
struct page *page,
|
|
struct rpcrdma_msg *rdma_resp,
|
|
struct svc_rdma_op_ctxt *ctxt,
|
|
struct svc_rdma_req_map *vec,
|
|
int byte_count)
|
|
{
|
|
struct ib_send_wr send_wr;
|
|
struct ib_send_wr inv_wr;
|
|
int sge_no;
|
|
int sge_bytes;
|
|
int page_no;
|
|
int ret;
|
|
|
|
/* Post a recv buffer to handle another request. */
|
|
ret = svc_rdma_post_recv(rdma);
|
|
if (ret) {
|
|
printk(KERN_INFO
|
|
"svcrdma: could not post a receive buffer, err=%d."
|
|
"Closing transport %p.\n", ret, rdma);
|
|
set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
|
|
svc_rdma_put_frmr(rdma, vec->frmr);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
/* Prepare the context */
|
|
ctxt->pages[0] = page;
|
|
ctxt->count = 1;
|
|
ctxt->frmr = vec->frmr;
|
|
if (vec->frmr)
|
|
set_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags);
|
|
else
|
|
clear_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags);
|
|
|
|
/* Prepare the SGE for the RPCRDMA Header */
|
|
ctxt->sge[0].lkey = rdma->sc_dma_lkey;
|
|
ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
|
|
ctxt->sge[0].addr =
|
|
ib_dma_map_single(rdma->sc_cm_id->device, page_address(page),
|
|
ctxt->sge[0].length, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
|
|
goto err;
|
|
atomic_inc(&rdma->sc_dma_used);
|
|
|
|
ctxt->direction = DMA_TO_DEVICE;
|
|
|
|
/* Determine how many of our SGE are to be transmitted */
|
|
for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
|
|
sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
|
|
byte_count -= sge_bytes;
|
|
if (!vec->frmr) {
|
|
ctxt->sge[sge_no].addr =
|
|
ib_dma_map_single(rdma->sc_cm_id->device,
|
|
vec->sge[sge_no].iov_base,
|
|
sge_bytes, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(rdma->sc_cm_id->device,
|
|
ctxt->sge[sge_no].addr))
|
|
goto err;
|
|
atomic_inc(&rdma->sc_dma_used);
|
|
ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey;
|
|
} else {
|
|
ctxt->sge[sge_no].addr = (unsigned long)
|
|
vec->sge[sge_no].iov_base;
|
|
ctxt->sge[sge_no].lkey = vec->frmr->mr->lkey;
|
|
}
|
|
ctxt->sge[sge_no].length = sge_bytes;
|
|
}
|
|
BUG_ON(byte_count != 0);
|
|
|
|
/* Save all respages in the ctxt and remove them from the
|
|
* respages array. They are our pages until the I/O
|
|
* completes.
|
|
*/
|
|
for (page_no = 0; page_no < rqstp->rq_resused; page_no++) {
|
|
ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
|
|
ctxt->count++;
|
|
rqstp->rq_respages[page_no] = NULL;
|
|
/*
|
|
* If there are more pages than SGE, terminate SGE
|
|
* list so that svc_rdma_unmap_dma doesn't attempt to
|
|
* unmap garbage.
|
|
*/
|
|
if (page_no+1 >= sge_no)
|
|
ctxt->sge[page_no+1].length = 0;
|
|
}
|
|
BUG_ON(sge_no > rdma->sc_max_sge);
|
|
memset(&send_wr, 0, sizeof send_wr);
|
|
ctxt->wr_op = IB_WR_SEND;
|
|
send_wr.wr_id = (unsigned long)ctxt;
|
|
send_wr.sg_list = ctxt->sge;
|
|
send_wr.num_sge = sge_no;
|
|
send_wr.opcode = IB_WR_SEND;
|
|
send_wr.send_flags = IB_SEND_SIGNALED;
|
|
if (vec->frmr) {
|
|
/* Prepare INVALIDATE WR */
|
|
memset(&inv_wr, 0, sizeof inv_wr);
|
|
inv_wr.opcode = IB_WR_LOCAL_INV;
|
|
inv_wr.send_flags = IB_SEND_SIGNALED;
|
|
inv_wr.ex.invalidate_rkey =
|
|
vec->frmr->mr->lkey;
|
|
send_wr.next = &inv_wr;
|
|
}
|
|
|
|
ret = svc_rdma_send(rdma, &send_wr);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_frmr(rdma, vec->frmr);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return -EIO;
|
|
}
|
|
|
|
void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Return the start of an xdr buffer.
|
|
*/
|
|
static void *xdr_start(struct xdr_buf *xdr)
|
|
{
|
|
return xdr->head[0].iov_base -
|
|
(xdr->len -
|
|
xdr->page_len -
|
|
xdr->tail[0].iov_len -
|
|
xdr->head[0].iov_len);
|
|
}
|
|
|
|
int svc_rdma_sendto(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_xprt *xprt = rqstp->rq_xprt;
|
|
struct svcxprt_rdma *rdma =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
struct rpcrdma_msg *rdma_argp;
|
|
struct rpcrdma_msg *rdma_resp;
|
|
struct rpcrdma_write_array *reply_ary;
|
|
enum rpcrdma_proc reply_type;
|
|
int ret;
|
|
int inline_bytes;
|
|
struct page *res_page;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
struct svc_rdma_req_map *vec;
|
|
|
|
dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
|
|
|
|
/* Get the RDMA request header. */
|
|
rdma_argp = xdr_start(&rqstp->rq_arg);
|
|
|
|
/* Build an req vec for the XDR */
|
|
ctxt = svc_rdma_get_context(rdma);
|
|
ctxt->direction = DMA_TO_DEVICE;
|
|
vec = svc_rdma_get_req_map();
|
|
ret = map_xdr(rdma, &rqstp->rq_res, vec);
|
|
if (ret)
|
|
goto err0;
|
|
inline_bytes = rqstp->rq_res.len;
|
|
|
|
/* Create the RDMA response header */
|
|
res_page = svc_rdma_get_page();
|
|
rdma_resp = page_address(res_page);
|
|
reply_ary = svc_rdma_get_reply_array(rdma_argp);
|
|
if (reply_ary)
|
|
reply_type = RDMA_NOMSG;
|
|
else
|
|
reply_type = RDMA_MSG;
|
|
svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
|
|
rdma_resp, reply_type);
|
|
|
|
/* Send any write-chunk data and build resp write-list */
|
|
ret = send_write_chunks(rdma, rdma_argp, rdma_resp,
|
|
rqstp, vec);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n",
|
|
ret);
|
|
goto err1;
|
|
}
|
|
inline_bytes -= ret;
|
|
|
|
/* Send any reply-list data and update resp reply-list */
|
|
ret = send_reply_chunks(rdma, rdma_argp, rdma_resp,
|
|
rqstp, vec);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n",
|
|
ret);
|
|
goto err1;
|
|
}
|
|
inline_bytes -= ret;
|
|
|
|
ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec,
|
|
inline_bytes);
|
|
svc_rdma_put_req_map(vec);
|
|
dprintk("svcrdma: send_reply returns %d\n", ret);
|
|
return ret;
|
|
|
|
err1:
|
|
put_page(res_page);
|
|
err0:
|
|
svc_rdma_put_req_map(vec);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
return ret;
|
|
}
|