753 lines
20 KiB
C
753 lines
20 KiB
C
/*
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* Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
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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/debug.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <linux/spinlock.h>
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#include <asm/unaligned.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <linux/sunrpc/svc_rdma.h>
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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static u32 xdr_padsize(u32 len)
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{
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return (len & 3) ? (4 - (len & 3)) : 0;
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}
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int svc_rdma_map_xdr(struct svcxprt_rdma *xprt,
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struct xdr_buf *xdr,
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struct svc_rdma_req_map *vec,
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bool write_chunk_present)
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{
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int sge_no;
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u32 sge_bytes;
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u32 page_bytes;
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u32 page_off;
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int page_no;
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if (xdr->len !=
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(xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len)) {
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pr_err("svcrdma: %s: XDR buffer length error\n", __func__);
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return -EIO;
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}
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/* Skip the first sge, this is for the RPCRDMA header */
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sge_no = 1;
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/* Head SGE */
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vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
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vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
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sge_no++;
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/* pages SGE */
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page_no = 0;
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page_bytes = xdr->page_len;
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page_off = xdr->page_base;
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while (page_bytes) {
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vec->sge[sge_no].iov_base =
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page_address(xdr->pages[page_no]) + page_off;
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sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
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page_bytes -= sge_bytes;
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vec->sge[sge_no].iov_len = sge_bytes;
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sge_no++;
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page_no++;
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page_off = 0; /* reset for next time through loop */
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}
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/* Tail SGE */
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if (xdr->tail[0].iov_len) {
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unsigned char *base = xdr->tail[0].iov_base;
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size_t len = xdr->tail[0].iov_len;
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u32 xdr_pad = xdr_padsize(xdr->page_len);
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if (write_chunk_present && xdr_pad) {
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base += xdr_pad;
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len -= xdr_pad;
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}
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if (len) {
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vec->sge[sge_no].iov_base = base;
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vec->sge[sge_no].iov_len = len;
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sge_no++;
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}
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}
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dprintk("svcrdma: %s: sge_no %d page_no %d "
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"page_base %u page_len %u head_len %zu tail_len %zu\n",
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__func__, sge_no, page_no, xdr->page_base, xdr->page_len,
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xdr->head[0].iov_len, xdr->tail[0].iov_len);
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vec->count = sge_no;
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return 0;
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}
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static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt,
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struct xdr_buf *xdr,
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u32 xdr_off, size_t len, int dir)
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{
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struct page *page;
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dma_addr_t dma_addr;
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if (xdr_off < xdr->head[0].iov_len) {
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/* This offset is in the head */
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xdr_off += (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
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page = virt_to_page(xdr->head[0].iov_base);
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} else {
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xdr_off -= xdr->head[0].iov_len;
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if (xdr_off < xdr->page_len) {
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/* This offset is in the page list */
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xdr_off += xdr->page_base;
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page = xdr->pages[xdr_off >> PAGE_SHIFT];
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xdr_off &= ~PAGE_MASK;
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} else {
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/* This offset is in the tail */
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xdr_off -= xdr->page_len;
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xdr_off += (unsigned long)
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xdr->tail[0].iov_base & ~PAGE_MASK;
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page = virt_to_page(xdr->tail[0].iov_base);
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}
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}
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dma_addr = ib_dma_map_page(xprt->sc_cm_id->device, page, xdr_off,
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min_t(size_t, PAGE_SIZE, len), dir);
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return dma_addr;
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}
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/* Returns the address of the first read chunk or <nul> if no read chunk
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* is present
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*/
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struct rpcrdma_read_chunk *
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svc_rdma_get_read_chunk(struct rpcrdma_msg *rmsgp)
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{
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struct rpcrdma_read_chunk *ch =
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(struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
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if (ch->rc_discrim == xdr_zero)
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return NULL;
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return ch;
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}
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/* Returns the address of the first read write array element or <nul>
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* if no write array list is present
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*/
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static struct rpcrdma_write_array *
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svc_rdma_get_write_array(struct rpcrdma_msg *rmsgp)
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{
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if (rmsgp->rm_body.rm_chunks[0] != xdr_zero ||
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rmsgp->rm_body.rm_chunks[1] == xdr_zero)
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return NULL;
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return (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[1];
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}
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/* Returns the address of the first reply array element or <nul> if no
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* reply array is present
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*/
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static struct rpcrdma_write_array *
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svc_rdma_get_reply_array(struct rpcrdma_msg *rmsgp,
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struct rpcrdma_write_array *wr_ary)
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{
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struct rpcrdma_read_chunk *rch;
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struct rpcrdma_write_array *rp_ary;
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/* XXX: Need to fix when reply chunk may occur with read list
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* and/or write list.
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*/
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if (rmsgp->rm_body.rm_chunks[0] != xdr_zero ||
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rmsgp->rm_body.rm_chunks[1] != xdr_zero)
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return NULL;
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rch = svc_rdma_get_read_chunk(rmsgp);
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if (rch) {
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while (rch->rc_discrim != xdr_zero)
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rch++;
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/* The reply chunk follows an empty write array located
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* at 'rc_position' here. The reply array is at rc_target.
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*/
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rp_ary = (struct rpcrdma_write_array *)&rch->rc_target;
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goto found_it;
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}
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if (wr_ary) {
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int chunk = be32_to_cpu(wr_ary->wc_nchunks);
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rp_ary = (struct rpcrdma_write_array *)
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&wr_ary->wc_array[chunk].wc_target.rs_length;
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goto found_it;
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}
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/* No read list, no write list */
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rp_ary = (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[2];
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found_it:
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if (rp_ary->wc_discrim == xdr_zero)
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return NULL;
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return rp_ary;
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}
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/* RPC-over-RDMA Version One private extension: Remote Invalidation.
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* Responder's choice: requester signals it can handle Send With
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* Invalidate, and responder chooses one rkey to invalidate.
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*
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* Find a candidate rkey to invalidate when sending a reply. Picks the
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* first rkey it finds in the chunks lists.
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*
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* Returns zero if RPC's chunk lists are empty.
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*/
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static u32 svc_rdma_get_inv_rkey(struct rpcrdma_msg *rdma_argp,
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struct rpcrdma_write_array *wr_ary,
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struct rpcrdma_write_array *rp_ary)
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{
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struct rpcrdma_read_chunk *rd_ary;
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struct rpcrdma_segment *arg_ch;
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u32 inv_rkey;
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inv_rkey = 0;
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rd_ary = svc_rdma_get_read_chunk(rdma_argp);
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if (rd_ary) {
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inv_rkey = be32_to_cpu(rd_ary->rc_target.rs_handle);
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goto out;
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}
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if (wr_ary && be32_to_cpu(wr_ary->wc_nchunks)) {
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arg_ch = &wr_ary->wc_array[0].wc_target;
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inv_rkey = be32_to_cpu(arg_ch->rs_handle);
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goto out;
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}
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if (rp_ary && be32_to_cpu(rp_ary->wc_nchunks)) {
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arg_ch = &rp_ary->wc_array[0].wc_target;
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inv_rkey = be32_to_cpu(arg_ch->rs_handle);
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goto out;
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}
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out:
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dprintk("svcrdma: Send With Invalidate rkey=%08x\n", inv_rkey);
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return inv_rkey;
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}
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/* Assumptions:
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* - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
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*/
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static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
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u32 rmr, u64 to,
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u32 xdr_off, int write_len,
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struct svc_rdma_req_map *vec)
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{
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struct ib_rdma_wr write_wr;
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struct ib_sge *sge;
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int xdr_sge_no;
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int sge_no;
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int sge_bytes;
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int sge_off;
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int bc;
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struct svc_rdma_op_ctxt *ctxt;
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if (vec->count > RPCSVC_MAXPAGES) {
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pr_err("svcrdma: Too many pages (%lu)\n", vec->count);
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return -EIO;
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}
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dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
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"write_len=%d, vec->sge=%p, vec->count=%lu\n",
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rmr, (unsigned long long)to, xdr_off,
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write_len, vec->sge, vec->count);
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ctxt = svc_rdma_get_context(xprt);
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ctxt->direction = DMA_TO_DEVICE;
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sge = ctxt->sge;
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/* Find the SGE associated with xdr_off */
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for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
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xdr_sge_no++) {
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if (vec->sge[xdr_sge_no].iov_len > bc)
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break;
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bc -= vec->sge[xdr_sge_no].iov_len;
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}
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sge_off = bc;
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bc = write_len;
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sge_no = 0;
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/* Copy the remaining SGE */
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while (bc != 0) {
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sge_bytes = min_t(size_t,
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bc, vec->sge[xdr_sge_no].iov_len-sge_off);
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sge[sge_no].length = sge_bytes;
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sge[sge_no].addr =
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dma_map_xdr(xprt, &rqstp->rq_res, xdr_off,
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sge_bytes, DMA_TO_DEVICE);
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xdr_off += sge_bytes;
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if (ib_dma_mapping_error(xprt->sc_cm_id->device,
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sge[sge_no].addr))
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goto err;
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svc_rdma_count_mappings(xprt, ctxt);
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sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey;
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ctxt->count++;
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sge_off = 0;
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sge_no++;
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xdr_sge_no++;
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if (xdr_sge_no > vec->count) {
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pr_err("svcrdma: Too many sges (%d)\n", xdr_sge_no);
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goto err;
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}
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bc -= sge_bytes;
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if (sge_no == xprt->sc_max_sge)
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break;
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}
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/* Prepare WRITE WR */
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memset(&write_wr, 0, sizeof write_wr);
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ctxt->cqe.done = svc_rdma_wc_write;
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write_wr.wr.wr_cqe = &ctxt->cqe;
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write_wr.wr.sg_list = &sge[0];
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write_wr.wr.num_sge = sge_no;
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write_wr.wr.opcode = IB_WR_RDMA_WRITE;
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write_wr.wr.send_flags = IB_SEND_SIGNALED;
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write_wr.rkey = rmr;
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write_wr.remote_addr = to;
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/* Post It */
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atomic_inc(&rdma_stat_write);
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if (svc_rdma_send(xprt, &write_wr.wr))
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goto err;
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return write_len - bc;
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err:
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svc_rdma_unmap_dma(ctxt);
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svc_rdma_put_context(ctxt, 0);
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return -EIO;
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}
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noinline
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static int send_write_chunks(struct svcxprt_rdma *xprt,
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struct rpcrdma_write_array *wr_ary,
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struct rpcrdma_msg *rdma_resp,
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struct svc_rqst *rqstp,
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struct svc_rdma_req_map *vec)
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{
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u32 xfer_len = rqstp->rq_res.page_len;
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int write_len;
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u32 xdr_off;
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int chunk_off;
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int chunk_no;
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int nchunks;
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struct rpcrdma_write_array *res_ary;
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int ret;
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res_ary = (struct rpcrdma_write_array *)
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&rdma_resp->rm_body.rm_chunks[1];
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/* Write chunks start at the pagelist */
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nchunks = be32_to_cpu(wr_ary->wc_nchunks);
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for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
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xfer_len && chunk_no < nchunks;
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chunk_no++) {
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struct rpcrdma_segment *arg_ch;
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u64 rs_offset;
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arg_ch = &wr_ary->wc_array[chunk_no].wc_target;
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write_len = min(xfer_len, be32_to_cpu(arg_ch->rs_length));
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/* Prepare the response chunk given the length actually
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* written */
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xdr_decode_hyper((__be32 *)&arg_ch->rs_offset, &rs_offset);
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svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
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arg_ch->rs_handle,
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arg_ch->rs_offset,
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write_len);
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chunk_off = 0;
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while (write_len) {
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ret = send_write(xprt, rqstp,
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be32_to_cpu(arg_ch->rs_handle),
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rs_offset + chunk_off,
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xdr_off,
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write_len,
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vec);
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if (ret <= 0)
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goto out_err;
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chunk_off += ret;
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xdr_off += ret;
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xfer_len -= ret;
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write_len -= ret;
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}
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}
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/* Update the req with the number of chunks actually used */
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svc_rdma_xdr_encode_write_list(rdma_resp, chunk_no);
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return rqstp->rq_res.page_len;
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out_err:
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pr_err("svcrdma: failed to send write chunks, rc=%d\n", ret);
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return -EIO;
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}
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noinline
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static int send_reply_chunks(struct svcxprt_rdma *xprt,
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struct rpcrdma_write_array *rp_ary,
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struct rpcrdma_msg *rdma_resp,
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struct svc_rqst *rqstp,
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struct svc_rdma_req_map *vec)
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{
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u32 xfer_len = rqstp->rq_res.len;
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int write_len;
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u32 xdr_off;
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int chunk_no;
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int chunk_off;
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int nchunks;
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struct rpcrdma_segment *ch;
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struct rpcrdma_write_array *res_ary;
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int ret;
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/* XXX: need to fix when reply lists occur with read-list and or
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* write-list */
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res_ary = (struct rpcrdma_write_array *)
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&rdma_resp->rm_body.rm_chunks[2];
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/* xdr offset starts at RPC message */
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nchunks = be32_to_cpu(rp_ary->wc_nchunks);
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for (xdr_off = 0, chunk_no = 0;
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xfer_len && chunk_no < nchunks;
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chunk_no++) {
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u64 rs_offset;
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ch = &rp_ary->wc_array[chunk_no].wc_target;
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write_len = min(xfer_len, be32_to_cpu(ch->rs_length));
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/* Prepare the reply chunk given the length actually
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* written */
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xdr_decode_hyper((__be32 *)&ch->rs_offset, &rs_offset);
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svc_rdma_xdr_encode_array_chunk(res_ary, chunk_no,
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ch->rs_handle, ch->rs_offset,
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write_len);
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|
chunk_off = 0;
|
|
while (write_len) {
|
|
ret = send_write(xprt, rqstp,
|
|
be32_to_cpu(ch->rs_handle),
|
|
rs_offset + chunk_off,
|
|
xdr_off,
|
|
write_len,
|
|
vec);
|
|
if (ret <= 0)
|
|
goto out_err;
|
|
chunk_off += ret;
|
|
xdr_off += ret;
|
|
xfer_len -= ret;
|
|
write_len -= ret;
|
|
}
|
|
}
|
|
/* 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;
|
|
|
|
out_err:
|
|
pr_err("svcrdma: failed to send reply chunks, rc=%d\n", ret);
|
|
return -EIO;
|
|
}
|
|
|
|
/* 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. NB: The offset of the payload
|
|
* to send is zero in the XDR.
|
|
*/
|
|
static int send_reply(struct svcxprt_rdma *rdma,
|
|
struct svc_rqst *rqstp,
|
|
struct page *page,
|
|
struct rpcrdma_msg *rdma_resp,
|
|
struct svc_rdma_req_map *vec,
|
|
int byte_count,
|
|
u32 inv_rkey)
|
|
{
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
struct ib_send_wr send_wr;
|
|
u32 xdr_off;
|
|
int sge_no;
|
|
int sge_bytes;
|
|
int page_no;
|
|
int pages;
|
|
int ret = -EIO;
|
|
|
|
/* Prepare the context */
|
|
ctxt = svc_rdma_get_context(rdma);
|
|
ctxt->direction = DMA_TO_DEVICE;
|
|
ctxt->pages[0] = page;
|
|
ctxt->count = 1;
|
|
|
|
/* Prepare the SGE for the RPCRDMA Header */
|
|
ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
|
|
ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
|
|
ctxt->sge[0].addr =
|
|
ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
|
|
ctxt->sge[0].length, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
|
|
goto err;
|
|
svc_rdma_count_mappings(rdma, ctxt);
|
|
|
|
ctxt->direction = DMA_TO_DEVICE;
|
|
|
|
/* Map the payload indicated by 'byte_count' */
|
|
xdr_off = 0;
|
|
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;
|
|
ctxt->sge[sge_no].addr =
|
|
dma_map_xdr(rdma, &rqstp->rq_res, xdr_off,
|
|
sge_bytes, DMA_TO_DEVICE);
|
|
xdr_off += sge_bytes;
|
|
if (ib_dma_mapping_error(rdma->sc_cm_id->device,
|
|
ctxt->sge[sge_no].addr))
|
|
goto err;
|
|
svc_rdma_count_mappings(rdma, ctxt);
|
|
ctxt->sge[sge_no].lkey = rdma->sc_pd->local_dma_lkey;
|
|
ctxt->sge[sge_no].length = sge_bytes;
|
|
}
|
|
if (byte_count != 0) {
|
|
pr_err("svcrdma: Could not map %d bytes\n", byte_count);
|
|
goto err;
|
|
}
|
|
|
|
/* Save all respages in the ctxt and remove them from the
|
|
* respages array. They are our pages until the I/O
|
|
* completes.
|
|
*/
|
|
pages = rqstp->rq_next_page - rqstp->rq_respages;
|
|
for (page_no = 0; page_no < pages; page_no++) {
|
|
ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
|
|
ctxt->count++;
|
|
rqstp->rq_respages[page_no] = NULL;
|
|
}
|
|
rqstp->rq_next_page = rqstp->rq_respages + 1;
|
|
|
|
if (sge_no > rdma->sc_max_sge) {
|
|
pr_err("svcrdma: Too many sges (%d)\n", sge_no);
|
|
goto err;
|
|
}
|
|
memset(&send_wr, 0, sizeof send_wr);
|
|
ctxt->cqe.done = svc_rdma_wc_send;
|
|
send_wr.wr_cqe = &ctxt->cqe;
|
|
send_wr.sg_list = ctxt->sge;
|
|
send_wr.num_sge = sge_no;
|
|
if (inv_rkey) {
|
|
send_wr.opcode = IB_WR_SEND_WITH_INV;
|
|
send_wr.ex.invalidate_rkey = inv_rkey;
|
|
} else
|
|
send_wr.opcode = IB_WR_SEND;
|
|
send_wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
ret = svc_rdma_send(rdma, &send_wr);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return ret;
|
|
}
|
|
|
|
void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp)
|
|
{
|
|
}
|
|
|
|
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 *wr_ary, *rp_ary;
|
|
enum rpcrdma_proc reply_type;
|
|
int ret;
|
|
int inline_bytes;
|
|
struct page *res_page;
|
|
struct svc_rdma_req_map *vec;
|
|
u32 inv_rkey;
|
|
|
|
dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
|
|
|
|
/* Get the RDMA request header. The receive logic always
|
|
* places this at the start of page 0.
|
|
*/
|
|
rdma_argp = page_address(rqstp->rq_pages[0]);
|
|
wr_ary = svc_rdma_get_write_array(rdma_argp);
|
|
rp_ary = svc_rdma_get_reply_array(rdma_argp, wr_ary);
|
|
|
|
inv_rkey = 0;
|
|
if (rdma->sc_snd_w_inv)
|
|
inv_rkey = svc_rdma_get_inv_rkey(rdma_argp, wr_ary, rp_ary);
|
|
|
|
/* Build an req vec for the XDR */
|
|
vec = svc_rdma_get_req_map(rdma);
|
|
ret = svc_rdma_map_xdr(rdma, &rqstp->rq_res, vec, wr_ary != NULL);
|
|
if (ret)
|
|
goto err0;
|
|
inline_bytes = rqstp->rq_res.len;
|
|
|
|
/* Create the RDMA response header */
|
|
ret = -ENOMEM;
|
|
res_page = alloc_page(GFP_KERNEL);
|
|
if (!res_page)
|
|
goto err0;
|
|
rdma_resp = page_address(res_page);
|
|
if (rp_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 */
|
|
if (wr_ary) {
|
|
ret = send_write_chunks(rdma, wr_ary, rdma_resp, rqstp, vec);
|
|
if (ret < 0)
|
|
goto err1;
|
|
inline_bytes -= ret + xdr_padsize(ret);
|
|
}
|
|
|
|
/* Send any reply-list data and update resp reply-list */
|
|
if (rp_ary) {
|
|
ret = send_reply_chunks(rdma, rp_ary, rdma_resp, rqstp, vec);
|
|
if (ret < 0)
|
|
goto err1;
|
|
inline_bytes -= ret;
|
|
}
|
|
|
|
/* Post a fresh Receive buffer _before_ sending the reply */
|
|
ret = svc_rdma_post_recv(rdma, GFP_KERNEL);
|
|
if (ret)
|
|
goto err1;
|
|
|
|
ret = send_reply(rdma, rqstp, res_page, rdma_resp, vec,
|
|
inline_bytes, inv_rkey);
|
|
if (ret < 0)
|
|
goto err0;
|
|
|
|
svc_rdma_put_req_map(rdma, vec);
|
|
dprintk("svcrdma: send_reply returns %d\n", ret);
|
|
return ret;
|
|
|
|
err1:
|
|
put_page(res_page);
|
|
err0:
|
|
svc_rdma_put_req_map(rdma, vec);
|
|
pr_err("svcrdma: Could not send reply, err=%d. Closing transport.\n",
|
|
ret);
|
|
set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
|
|
int status)
|
|
{
|
|
struct ib_send_wr err_wr;
|
|
struct page *p;
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
enum rpcrdma_errcode err;
|
|
__be32 *va;
|
|
int length;
|
|
int ret;
|
|
|
|
ret = svc_rdma_repost_recv(xprt, GFP_KERNEL);
|
|
if (ret)
|
|
return;
|
|
|
|
p = alloc_page(GFP_KERNEL);
|
|
if (!p)
|
|
return;
|
|
va = page_address(p);
|
|
|
|
/* XDR encode an error reply */
|
|
err = ERR_CHUNK;
|
|
if (status == -EPROTONOSUPPORT)
|
|
err = ERR_VERS;
|
|
length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
|
|
|
|
ctxt = svc_rdma_get_context(xprt);
|
|
ctxt->direction = DMA_TO_DEVICE;
|
|
ctxt->count = 1;
|
|
ctxt->pages[0] = p;
|
|
|
|
/* Prepare SGE for local address */
|
|
ctxt->sge[0].lkey = xprt->sc_pd->local_dma_lkey;
|
|
ctxt->sge[0].length = length;
|
|
ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device,
|
|
p, 0, length, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) {
|
|
dprintk("svcrdma: Error mapping buffer for protocol error\n");
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return;
|
|
}
|
|
svc_rdma_count_mappings(xprt, ctxt);
|
|
|
|
/* Prepare SEND WR */
|
|
memset(&err_wr, 0, sizeof(err_wr));
|
|
ctxt->cqe.done = svc_rdma_wc_send;
|
|
err_wr.wr_cqe = &ctxt->cqe;
|
|
err_wr.sg_list = ctxt->sge;
|
|
err_wr.num_sge = 1;
|
|
err_wr.opcode = IB_WR_SEND;
|
|
err_wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
/* Post It */
|
|
ret = svc_rdma_send(xprt, &err_wr);
|
|
if (ret) {
|
|
dprintk("svcrdma: Error %d posting send for protocol error\n",
|
|
ret);
|
|
svc_rdma_unmap_dma(ctxt);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
}
|
|
}
|