561 lines
16 KiB
C
561 lines
16 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 int 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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{
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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: map_xdr: XDR buffer length error\n");
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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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vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
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vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
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sge_no++;
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}
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dprintk("svcrdma: map_xdr: 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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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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/* 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_send_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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atomic_inc(&xprt->sc_dma_used);
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sge[sge_no].lkey = xprt->sc_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->wr_op = IB_WR_RDMA_WRITE;
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write_wr.wr_id = (unsigned long)ctxt;
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write_wr.sg_list = &sge[0];
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write_wr.num_sge = sge_no;
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write_wr.opcode = IB_WR_RDMA_WRITE;
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write_wr.send_flags = IB_SEND_SIGNALED;
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write_wr.wr.rdma.rkey = rmr;
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write_wr.wr.rdma.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))
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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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/* Fatal error, close transport */
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return -EIO;
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}
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static int send_write_chunks(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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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 + rqstp->rq_res.tail[0].iov_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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struct rpcrdma_write_array *arg_ary;
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struct rpcrdma_write_array *res_ary;
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int ret;
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arg_ary = svc_rdma_get_write_array(rdma_argp);
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if (!arg_ary)
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return 0;
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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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for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0;
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xfer_len && chunk_no < arg_ary->wc_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 = &arg_ary->wc_array[chunk_no].wc_target;
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write_len = min(xfer_len, ntohl(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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ntohl(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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dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
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ret);
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return -EIO;
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}
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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 + rqstp->rq_res.tail[0].iov_len;
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}
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static int send_reply_chunks(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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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 *arg_ary;
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struct rpcrdma_write_array *res_ary;
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int ret;
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arg_ary = svc_rdma_get_reply_array(rdma_argp);
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if (!arg_ary)
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return 0;
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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 = ntohl(arg_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 = &arg_ary->wc_array[chunk_no].wc_target;
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write_len = min(xfer_len, htonl(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;
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while (write_len) {
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ret = send_write(xprt, rqstp,
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ntohl(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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dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
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ret);
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return -EIO;
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}
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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_reply_array(res_ary, chunk_no);
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return rqstp->rq_res.len;
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}
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/* This function prepares the portion of the RPCRDMA message to be
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* sent in the RDMA_SEND. This function is called after data sent via
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* RDMA has already been transmitted. There are three cases:
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* - The RPCRDMA header, RPC header, and payload are all sent in a
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* single RDMA_SEND. This is the "inline" case.
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* - The RPCRDMA header and some portion of the RPC header and data
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* are sent via this RDMA_SEND and another portion of the data is
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* sent via RDMA.
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* - The RPCRDMA header [NOMSG] is sent in this RDMA_SEND and the RPC
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* header and data are all transmitted via RDMA.
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* In all three cases, this function prepares the RPCRDMA header in
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* sge[0], the 'type' parameter indicates the type to place in the
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* RPCRDMA header, and the 'byte_count' field indicates how much of
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* the XDR to include in this RDMA_SEND. NB: The offset of the payload
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* to send is zero in the XDR.
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*/
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static int send_reply(struct svcxprt_rdma *rdma,
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struct svc_rqst *rqstp,
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struct page *page,
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struct rpcrdma_msg *rdma_resp,
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struct svc_rdma_op_ctxt *ctxt,
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struct svc_rdma_req_map *vec,
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int byte_count)
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{
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struct ib_send_wr send_wr;
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int sge_no;
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int sge_bytes;
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int page_no;
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int pages;
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int ret;
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/* Post a recv buffer to handle another request. */
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ret = svc_rdma_post_recv(rdma);
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if (ret) {
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printk(KERN_INFO
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"svcrdma: could not post a receive buffer, err=%d."
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"Closing transport %p.\n", ret, rdma);
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set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
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svc_rdma_put_context(ctxt, 0);
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return -ENOTCONN;
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}
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/* Prepare the context */
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ctxt->pages[0] = page;
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ctxt->count = 1;
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/* Prepare the SGE for the RPCRDMA Header */
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ctxt->sge[0].lkey = rdma->sc_dma_lkey;
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ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
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ctxt->sge[0].addr =
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ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
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ctxt->sge[0].length, DMA_TO_DEVICE);
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if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
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goto err;
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atomic_inc(&rdma->sc_dma_used);
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ctxt->direction = DMA_TO_DEVICE;
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/* Map the payload indicated by 'byte_count' */
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for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
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int xdr_off = 0;
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sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
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byte_count -= sge_bytes;
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ctxt->sge[sge_no].addr =
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dma_map_xdr(rdma, &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(rdma->sc_cm_id->device,
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ctxt->sge[sge_no].addr))
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goto err;
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atomic_inc(&rdma->sc_dma_used);
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ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey;
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ctxt->sge[sge_no].length = sge_bytes;
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}
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if (byte_count != 0) {
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pr_err("svcrdma: Could not map %d bytes\n", byte_count);
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goto err;
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}
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/* Save all respages in the ctxt and remove them from the
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* respages array. They are our pages until the I/O
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* completes.
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*/
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pages = rqstp->rq_next_page - rqstp->rq_respages;
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for (page_no = 0; page_no < pages; page_no++) {
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ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
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ctxt->count++;
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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;
|
|
}
|
|
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->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;
|
|
|
|
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 -EIO;
|
|
}
|
|
|
|
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 *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. The receive logic always
|
|
* places this at the start of page 0.
|
|
*/
|
|
rdma_argp = page_address(rqstp->rq_pages[0]);
|
|
|
|
/* 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;
|
|
}
|