1187 строки
34 KiB
C
1187 строки
34 KiB
C
/*
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* Copyright (c) 2003-2007 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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/*
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* rpc_rdma.c
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*
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* This file contains the guts of the RPC RDMA protocol, and
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* does marshaling/unmarshaling, etc. It is also where interfacing
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* to the Linux RPC framework lives.
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*/
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#include "xprt_rdma.h"
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#include <linux/highmem.h>
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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static const char transfertypes[][12] = {
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"inline", /* no chunks */
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"read list", /* some argument via rdma read */
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"*read list", /* entire request via rdma read */
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"write list", /* some result via rdma write */
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"reply chunk" /* entire reply via rdma write */
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};
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/* Returns size of largest RPC-over-RDMA header in a Call message
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*
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* The largest Call header contains a full-size Read list and a
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* minimal Reply chunk.
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*/
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static unsigned int rpcrdma_max_call_header_size(unsigned int maxsegs)
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{
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unsigned int size;
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/* Fixed header fields and list discriminators */
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size = RPCRDMA_HDRLEN_MIN;
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/* Maximum Read list size */
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maxsegs += 2; /* segment for head and tail buffers */
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size = maxsegs * sizeof(struct rpcrdma_read_chunk);
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/* Minimal Read chunk size */
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size += sizeof(__be32); /* segment count */
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size += sizeof(struct rpcrdma_segment);
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size += sizeof(__be32); /* list discriminator */
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dprintk("RPC: %s: max call header size = %u\n",
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__func__, size);
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return size;
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}
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/* Returns size of largest RPC-over-RDMA header in a Reply message
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*
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* There is only one Write list or one Reply chunk per Reply
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* message. The larger list is the Write list.
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*/
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static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs)
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{
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unsigned int size;
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/* Fixed header fields and list discriminators */
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size = RPCRDMA_HDRLEN_MIN;
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/* Maximum Write list size */
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maxsegs += 2; /* segment for head and tail buffers */
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size = sizeof(__be32); /* segment count */
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size += maxsegs * sizeof(struct rpcrdma_segment);
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size += sizeof(__be32); /* list discriminator */
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dprintk("RPC: %s: max reply header size = %u\n",
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__func__, size);
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return size;
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}
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void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *r_xprt)
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{
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struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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unsigned int maxsegs = ia->ri_max_segs;
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ia->ri_max_inline_write = cdata->inline_wsize -
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rpcrdma_max_call_header_size(maxsegs);
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ia->ri_max_inline_read = cdata->inline_rsize -
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rpcrdma_max_reply_header_size(maxsegs);
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}
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/* The client can send a request inline as long as the RPCRDMA header
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* plus the RPC call fit under the transport's inline limit. If the
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* combined call message size exceeds that limit, the client must use
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* a Read chunk for this operation.
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*
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* A Read chunk is also required if sending the RPC call inline would
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* exceed this device's max_sge limit.
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*/
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static bool rpcrdma_args_inline(struct rpcrdma_xprt *r_xprt,
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struct rpc_rqst *rqst)
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{
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struct xdr_buf *xdr = &rqst->rq_snd_buf;
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unsigned int count, remaining, offset;
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if (xdr->len > r_xprt->rx_ia.ri_max_inline_write)
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return false;
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if (xdr->page_len) {
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remaining = xdr->page_len;
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offset = xdr->page_base & ~PAGE_MASK;
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count = 0;
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while (remaining) {
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remaining -= min_t(unsigned int,
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PAGE_SIZE - offset, remaining);
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offset = 0;
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if (++count > r_xprt->rx_ia.ri_max_send_sges)
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return false;
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}
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}
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return true;
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}
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/* The client can't know how large the actual reply will be. Thus it
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* plans for the largest possible reply for that particular ULP
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* operation. If the maximum combined reply message size exceeds that
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* limit, the client must provide a write list or a reply chunk for
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* this request.
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*/
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static bool rpcrdma_results_inline(struct rpcrdma_xprt *r_xprt,
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struct rpc_rqst *rqst)
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{
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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return rqst->rq_rcv_buf.buflen <= ia->ri_max_inline_read;
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}
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/* Split "vec" on page boundaries into segments. FMR registers pages,
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* not a byte range. Other modes coalesce these segments into a single
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* MR when they can.
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*/
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static int
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rpcrdma_convert_kvec(struct kvec *vec, struct rpcrdma_mr_seg *seg, int n)
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{
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size_t page_offset;
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u32 remaining;
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char *base;
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base = vec->iov_base;
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page_offset = offset_in_page(base);
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remaining = vec->iov_len;
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while (remaining && n < RPCRDMA_MAX_SEGS) {
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seg[n].mr_page = NULL;
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seg[n].mr_offset = base;
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seg[n].mr_len = min_t(u32, PAGE_SIZE - page_offset, remaining);
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remaining -= seg[n].mr_len;
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base += seg[n].mr_len;
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++n;
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page_offset = 0;
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}
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return n;
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}
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/*
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* Chunk assembly from upper layer xdr_buf.
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*
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* Prepare the passed-in xdr_buf into representation as RPC/RDMA chunk
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* elements. Segments are then coalesced when registered, if possible
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* within the selected memreg mode.
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*
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* Returns positive number of segments converted, or a negative errno.
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*/
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static int
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rpcrdma_convert_iovs(struct rpcrdma_xprt *r_xprt, struct xdr_buf *xdrbuf,
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unsigned int pos, enum rpcrdma_chunktype type,
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struct rpcrdma_mr_seg *seg)
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{
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int len, n, p, page_base;
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struct page **ppages;
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n = 0;
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if (pos == 0) {
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n = rpcrdma_convert_kvec(&xdrbuf->head[0], seg, n);
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if (n == RPCRDMA_MAX_SEGS)
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goto out_overflow;
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}
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len = xdrbuf->page_len;
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ppages = xdrbuf->pages + (xdrbuf->page_base >> PAGE_SHIFT);
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page_base = xdrbuf->page_base & ~PAGE_MASK;
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p = 0;
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while (len && n < RPCRDMA_MAX_SEGS) {
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if (!ppages[p]) {
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/* alloc the pagelist for receiving buffer */
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ppages[p] = alloc_page(GFP_ATOMIC);
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if (!ppages[p])
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return -EAGAIN;
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}
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seg[n].mr_page = ppages[p];
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seg[n].mr_offset = (void *)(unsigned long) page_base;
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seg[n].mr_len = min_t(u32, PAGE_SIZE - page_base, len);
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if (seg[n].mr_len > PAGE_SIZE)
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goto out_overflow;
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len -= seg[n].mr_len;
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++n;
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++p;
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page_base = 0; /* page offset only applies to first page */
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}
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/* Message overflows the seg array */
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if (len && n == RPCRDMA_MAX_SEGS)
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goto out_overflow;
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/* When encoding a Read chunk, the tail iovec contains an
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* XDR pad and may be omitted.
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*/
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if (type == rpcrdma_readch && r_xprt->rx_ia.ri_implicit_roundup)
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return n;
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/* When encoding a Write chunk, some servers need to see an
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* extra segment for non-XDR-aligned Write chunks. The upper
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* layer provides space in the tail iovec that may be used
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* for this purpose.
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*/
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if (type == rpcrdma_writech && r_xprt->rx_ia.ri_implicit_roundup)
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return n;
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if (xdrbuf->tail[0].iov_len) {
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n = rpcrdma_convert_kvec(&xdrbuf->tail[0], seg, n);
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if (n == RPCRDMA_MAX_SEGS)
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goto out_overflow;
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}
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return n;
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out_overflow:
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pr_err("rpcrdma: segment array overflow\n");
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return -EIO;
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}
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static inline __be32 *
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xdr_encode_rdma_segment(__be32 *iptr, struct rpcrdma_mw *mw)
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{
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*iptr++ = cpu_to_be32(mw->mw_handle);
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*iptr++ = cpu_to_be32(mw->mw_length);
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return xdr_encode_hyper(iptr, mw->mw_offset);
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}
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/* XDR-encode the Read list. Supports encoding a list of read
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* segments that belong to a single read chunk.
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*
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* Encoding key for single-list chunks (HLOO = Handle32 Length32 Offset64):
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*
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* Read chunklist (a linked list):
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* N elements, position P (same P for all chunks of same arg!):
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* 1 - PHLOO - 1 - PHLOO - ... - 1 - PHLOO - 0
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*
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* Returns a pointer to the XDR word in the RDMA header following
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* the end of the Read list, or an error pointer.
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*/
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static __be32 *
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rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt,
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struct rpcrdma_req *req, struct rpc_rqst *rqst,
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__be32 *iptr, enum rpcrdma_chunktype rtype)
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{
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struct rpcrdma_mr_seg *seg;
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struct rpcrdma_mw *mw;
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unsigned int pos;
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int n, nsegs;
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if (rtype == rpcrdma_noch) {
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*iptr++ = xdr_zero; /* item not present */
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return iptr;
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}
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pos = rqst->rq_snd_buf.head[0].iov_len;
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if (rtype == rpcrdma_areadch)
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pos = 0;
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seg = req->rl_segments;
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nsegs = rpcrdma_convert_iovs(r_xprt, &rqst->rq_snd_buf, pos,
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rtype, seg);
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if (nsegs < 0)
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return ERR_PTR(nsegs);
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do {
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n = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
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false, &mw);
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if (n < 0)
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return ERR_PTR(n);
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rpcrdma_push_mw(mw, &req->rl_registered);
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*iptr++ = xdr_one; /* item present */
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/* All read segments in this chunk
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* have the same "position".
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*/
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*iptr++ = cpu_to_be32(pos);
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iptr = xdr_encode_rdma_segment(iptr, mw);
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dprintk("RPC: %5u %s: pos %u %u@0x%016llx:0x%08x (%s)\n",
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rqst->rq_task->tk_pid, __func__, pos,
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mw->mw_length, (unsigned long long)mw->mw_offset,
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mw->mw_handle, n < nsegs ? "more" : "last");
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r_xprt->rx_stats.read_chunk_count++;
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seg += n;
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nsegs -= n;
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} while (nsegs);
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/* Finish Read list */
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*iptr++ = xdr_zero; /* Next item not present */
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return iptr;
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}
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/* XDR-encode the Write list. Supports encoding a list containing
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* one array of plain segments that belong to a single write chunk.
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*
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* Encoding key for single-list chunks (HLOO = Handle32 Length32 Offset64):
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*
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* Write chunklist (a list of (one) counted array):
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* N elements:
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* 1 - N - HLOO - HLOO - ... - HLOO - 0
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*
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* Returns a pointer to the XDR word in the RDMA header following
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* the end of the Write list, or an error pointer.
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*/
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static __be32 *
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rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
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struct rpc_rqst *rqst, __be32 *iptr,
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enum rpcrdma_chunktype wtype)
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{
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struct rpcrdma_mr_seg *seg;
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struct rpcrdma_mw *mw;
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int n, nsegs, nchunks;
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__be32 *segcount;
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if (wtype != rpcrdma_writech) {
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*iptr++ = xdr_zero; /* no Write list present */
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return iptr;
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}
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seg = req->rl_segments;
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nsegs = rpcrdma_convert_iovs(r_xprt, &rqst->rq_rcv_buf,
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rqst->rq_rcv_buf.head[0].iov_len,
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wtype, seg);
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if (nsegs < 0)
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return ERR_PTR(nsegs);
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*iptr++ = xdr_one; /* Write list present */
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segcount = iptr++; /* save location of segment count */
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nchunks = 0;
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do {
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n = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
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true, &mw);
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if (n < 0)
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return ERR_PTR(n);
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rpcrdma_push_mw(mw, &req->rl_registered);
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iptr = xdr_encode_rdma_segment(iptr, mw);
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dprintk("RPC: %5u %s: %u@0x016%llx:0x%08x (%s)\n",
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rqst->rq_task->tk_pid, __func__,
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mw->mw_length, (unsigned long long)mw->mw_offset,
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mw->mw_handle, n < nsegs ? "more" : "last");
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r_xprt->rx_stats.write_chunk_count++;
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r_xprt->rx_stats.total_rdma_request += seg->mr_len;
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nchunks++;
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seg += n;
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nsegs -= n;
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} while (nsegs);
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/* Update count of segments in this Write chunk */
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*segcount = cpu_to_be32(nchunks);
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/* Finish Write list */
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*iptr++ = xdr_zero; /* Next item not present */
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return iptr;
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}
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/* XDR-encode the Reply chunk. Supports encoding an array of plain
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* segments that belong to a single write (reply) chunk.
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*
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* Encoding key for single-list chunks (HLOO = Handle32 Length32 Offset64):
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*
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* Reply chunk (a counted array):
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* N elements:
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* 1 - N - HLOO - HLOO - ... - HLOO
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*
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* Returns a pointer to the XDR word in the RDMA header following
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* the end of the Reply chunk, or an error pointer.
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*/
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static __be32 *
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rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt,
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struct rpcrdma_req *req, struct rpc_rqst *rqst,
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__be32 *iptr, enum rpcrdma_chunktype wtype)
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{
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struct rpcrdma_mr_seg *seg;
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struct rpcrdma_mw *mw;
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int n, nsegs, nchunks;
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__be32 *segcount;
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if (wtype != rpcrdma_replych) {
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*iptr++ = xdr_zero; /* no Reply chunk present */
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return iptr;
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}
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seg = req->rl_segments;
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nsegs = rpcrdma_convert_iovs(r_xprt, &rqst->rq_rcv_buf, 0, wtype, seg);
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if (nsegs < 0)
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return ERR_PTR(nsegs);
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*iptr++ = xdr_one; /* Reply chunk present */
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segcount = iptr++; /* save location of segment count */
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nchunks = 0;
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do {
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n = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
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true, &mw);
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if (n < 0)
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return ERR_PTR(n);
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rpcrdma_push_mw(mw, &req->rl_registered);
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iptr = xdr_encode_rdma_segment(iptr, mw);
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dprintk("RPC: %5u %s: %u@0x%016llx:0x%08x (%s)\n",
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rqst->rq_task->tk_pid, __func__,
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mw->mw_length, (unsigned long long)mw->mw_offset,
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mw->mw_handle, n < nsegs ? "more" : "last");
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r_xprt->rx_stats.reply_chunk_count++;
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r_xprt->rx_stats.total_rdma_request += seg->mr_len;
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nchunks++;
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seg += n;
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nsegs -= n;
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} while (nsegs);
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/* Update count of segments in the Reply chunk */
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*segcount = cpu_to_be32(nchunks);
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return iptr;
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}
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/* Prepare the RPC-over-RDMA header SGE.
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*/
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static bool
|
|
rpcrdma_prepare_hdr_sge(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
|
|
u32 len)
|
|
{
|
|
struct rpcrdma_regbuf *rb = req->rl_rdmabuf;
|
|
struct ib_sge *sge = &req->rl_send_sge[0];
|
|
|
|
if (unlikely(!rpcrdma_regbuf_is_mapped(rb))) {
|
|
if (!__rpcrdma_dma_map_regbuf(ia, rb))
|
|
return false;
|
|
sge->addr = rdmab_addr(rb);
|
|
sge->lkey = rdmab_lkey(rb);
|
|
}
|
|
sge->length = len;
|
|
|
|
ib_dma_sync_single_for_device(ia->ri_device, sge->addr,
|
|
sge->length, DMA_TO_DEVICE);
|
|
req->rl_send_wr.num_sge++;
|
|
return true;
|
|
}
|
|
|
|
/* Prepare the Send SGEs. The head and tail iovec, and each entry
|
|
* in the page list, gets its own SGE.
|
|
*/
|
|
static bool
|
|
rpcrdma_prepare_msg_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
|
|
struct xdr_buf *xdr, enum rpcrdma_chunktype rtype)
|
|
{
|
|
unsigned int sge_no, page_base, len, remaining;
|
|
struct rpcrdma_regbuf *rb = req->rl_sendbuf;
|
|
struct ib_device *device = ia->ri_device;
|
|
struct ib_sge *sge = req->rl_send_sge;
|
|
u32 lkey = ia->ri_pd->local_dma_lkey;
|
|
struct page *page, **ppages;
|
|
|
|
/* The head iovec is straightforward, as it is already
|
|
* DMA-mapped. Sync the content that has changed.
|
|
*/
|
|
if (!rpcrdma_dma_map_regbuf(ia, rb))
|
|
return false;
|
|
sge_no = 1;
|
|
sge[sge_no].addr = rdmab_addr(rb);
|
|
sge[sge_no].length = xdr->head[0].iov_len;
|
|
sge[sge_no].lkey = rdmab_lkey(rb);
|
|
ib_dma_sync_single_for_device(device, sge[sge_no].addr,
|
|
sge[sge_no].length, DMA_TO_DEVICE);
|
|
|
|
/* If there is a Read chunk, the page list is being handled
|
|
* via explicit RDMA, and thus is skipped here. However, the
|
|
* tail iovec may include an XDR pad for the page list, as
|
|
* well as additional content, and may not reside in the
|
|
* same page as the head iovec.
|
|
*/
|
|
if (rtype == rpcrdma_readch) {
|
|
len = xdr->tail[0].iov_len;
|
|
|
|
/* Do not include the tail if it is only an XDR pad */
|
|
if (len < 4)
|
|
goto out;
|
|
|
|
page = virt_to_page(xdr->tail[0].iov_base);
|
|
page_base = (unsigned long)xdr->tail[0].iov_base & ~PAGE_MASK;
|
|
|
|
/* If the content in the page list is an odd length,
|
|
* xdr_write_pages() has added a pad at the beginning
|
|
* of the tail iovec. Force the tail's non-pad content
|
|
* to land at the next XDR position in the Send message.
|
|
*/
|
|
page_base += len & 3;
|
|
len -= len & 3;
|
|
goto map_tail;
|
|
}
|
|
|
|
/* If there is a page list present, temporarily DMA map
|
|
* and prepare an SGE for each page to be sent.
|
|
*/
|
|
if (xdr->page_len) {
|
|
ppages = xdr->pages + (xdr->page_base >> PAGE_SHIFT);
|
|
page_base = xdr->page_base & ~PAGE_MASK;
|
|
remaining = xdr->page_len;
|
|
while (remaining) {
|
|
sge_no++;
|
|
if (sge_no > RPCRDMA_MAX_SEND_SGES - 2)
|
|
goto out_mapping_overflow;
|
|
|
|
len = min_t(u32, PAGE_SIZE - page_base, remaining);
|
|
sge[sge_no].addr = ib_dma_map_page(device, *ppages,
|
|
page_base, len,
|
|
DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(device, sge[sge_no].addr))
|
|
goto out_mapping_err;
|
|
sge[sge_no].length = len;
|
|
sge[sge_no].lkey = lkey;
|
|
|
|
req->rl_mapped_sges++;
|
|
ppages++;
|
|
remaining -= len;
|
|
page_base = 0;
|
|
}
|
|
}
|
|
|
|
/* The tail iovec is not always constructed in the same
|
|
* page where the head iovec resides (see, for example,
|
|
* gss_wrap_req_priv). To neatly accommodate that case,
|
|
* DMA map it separately.
|
|
*/
|
|
if (xdr->tail[0].iov_len) {
|
|
page = virt_to_page(xdr->tail[0].iov_base);
|
|
page_base = (unsigned long)xdr->tail[0].iov_base & ~PAGE_MASK;
|
|
len = xdr->tail[0].iov_len;
|
|
|
|
map_tail:
|
|
sge_no++;
|
|
sge[sge_no].addr = ib_dma_map_page(device, page,
|
|
page_base, len,
|
|
DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(device, sge[sge_no].addr))
|
|
goto out_mapping_err;
|
|
sge[sge_no].length = len;
|
|
sge[sge_no].lkey = lkey;
|
|
req->rl_mapped_sges++;
|
|
}
|
|
|
|
out:
|
|
req->rl_send_wr.num_sge = sge_no + 1;
|
|
return true;
|
|
|
|
out_mapping_overflow:
|
|
pr_err("rpcrdma: too many Send SGEs (%u)\n", sge_no);
|
|
return false;
|
|
|
|
out_mapping_err:
|
|
pr_err("rpcrdma: Send mapping error\n");
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
rpcrdma_prepare_send_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
|
|
u32 hdrlen, struct xdr_buf *xdr,
|
|
enum rpcrdma_chunktype rtype)
|
|
{
|
|
req->rl_send_wr.num_sge = 0;
|
|
req->rl_mapped_sges = 0;
|
|
|
|
if (!rpcrdma_prepare_hdr_sge(ia, req, hdrlen))
|
|
goto out_map;
|
|
|
|
if (rtype != rpcrdma_areadch)
|
|
if (!rpcrdma_prepare_msg_sges(ia, req, xdr, rtype))
|
|
goto out_map;
|
|
|
|
return true;
|
|
|
|
out_map:
|
|
pr_err("rpcrdma: failed to DMA map a Send buffer\n");
|
|
return false;
|
|
}
|
|
|
|
void
|
|
rpcrdma_unmap_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
|
|
{
|
|
struct ib_device *device = ia->ri_device;
|
|
struct ib_sge *sge;
|
|
int count;
|
|
|
|
sge = &req->rl_send_sge[2];
|
|
for (count = req->rl_mapped_sges; count--; sge++)
|
|
ib_dma_unmap_page(device, sge->addr, sge->length,
|
|
DMA_TO_DEVICE);
|
|
req->rl_mapped_sges = 0;
|
|
}
|
|
|
|
/*
|
|
* Marshal a request: the primary job of this routine is to choose
|
|
* the transfer modes. See comments below.
|
|
*
|
|
* Returns zero on success, otherwise a negative errno.
|
|
*/
|
|
|
|
int
|
|
rpcrdma_marshal_req(struct rpc_rqst *rqst)
|
|
{
|
|
struct rpc_xprt *xprt = rqst->rq_xprt;
|
|
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
|
|
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
|
|
enum rpcrdma_chunktype rtype, wtype;
|
|
struct rpcrdma_msg *headerp;
|
|
bool ddp_allowed;
|
|
ssize_t hdrlen;
|
|
size_t rpclen;
|
|
__be32 *iptr;
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
if (test_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state))
|
|
return rpcrdma_bc_marshal_reply(rqst);
|
|
#endif
|
|
|
|
headerp = rdmab_to_msg(req->rl_rdmabuf);
|
|
/* don't byte-swap XID, it's already done in request */
|
|
headerp->rm_xid = rqst->rq_xid;
|
|
headerp->rm_vers = rpcrdma_version;
|
|
headerp->rm_credit = cpu_to_be32(r_xprt->rx_buf.rb_max_requests);
|
|
headerp->rm_type = rdma_msg;
|
|
|
|
/* When the ULP employs a GSS flavor that guarantees integrity
|
|
* or privacy, direct data placement of individual data items
|
|
* is not allowed.
|
|
*/
|
|
ddp_allowed = !(rqst->rq_cred->cr_auth->au_flags &
|
|
RPCAUTH_AUTH_DATATOUCH);
|
|
|
|
/*
|
|
* Chunks needed for results?
|
|
*
|
|
* o If the expected result is under the inline threshold, all ops
|
|
* return as inline.
|
|
* o Large read ops return data as write chunk(s), header as
|
|
* inline.
|
|
* o Large non-read ops return as a single reply chunk.
|
|
*/
|
|
if (rpcrdma_results_inline(r_xprt, rqst))
|
|
wtype = rpcrdma_noch;
|
|
else if (ddp_allowed && rqst->rq_rcv_buf.flags & XDRBUF_READ)
|
|
wtype = rpcrdma_writech;
|
|
else
|
|
wtype = rpcrdma_replych;
|
|
|
|
/*
|
|
* Chunks needed for arguments?
|
|
*
|
|
* o If the total request is under the inline threshold, all ops
|
|
* are sent as inline.
|
|
* o Large write ops transmit data as read chunk(s), header as
|
|
* inline.
|
|
* o Large non-write ops are sent with the entire message as a
|
|
* single read chunk (protocol 0-position special case).
|
|
*
|
|
* This assumes that the upper layer does not present a request
|
|
* that both has a data payload, and whose non-data arguments
|
|
* by themselves are larger than the inline threshold.
|
|
*/
|
|
if (rpcrdma_args_inline(r_xprt, rqst)) {
|
|
rtype = rpcrdma_noch;
|
|
rpclen = rqst->rq_snd_buf.len;
|
|
} else if (ddp_allowed && rqst->rq_snd_buf.flags & XDRBUF_WRITE) {
|
|
rtype = rpcrdma_readch;
|
|
rpclen = rqst->rq_snd_buf.head[0].iov_len +
|
|
rqst->rq_snd_buf.tail[0].iov_len;
|
|
} else {
|
|
r_xprt->rx_stats.nomsg_call_count++;
|
|
headerp->rm_type = htonl(RDMA_NOMSG);
|
|
rtype = rpcrdma_areadch;
|
|
rpclen = 0;
|
|
}
|
|
|
|
/* This implementation supports the following combinations
|
|
* of chunk lists in one RPC-over-RDMA Call message:
|
|
*
|
|
* - Read list
|
|
* - Write list
|
|
* - Reply chunk
|
|
* - Read list + Reply chunk
|
|
*
|
|
* It might not yet support the following combinations:
|
|
*
|
|
* - Read list + Write list
|
|
*
|
|
* It does not support the following combinations:
|
|
*
|
|
* - Write list + Reply chunk
|
|
* - Read list + Write list + Reply chunk
|
|
*
|
|
* This implementation supports only a single chunk in each
|
|
* Read or Write list. Thus for example the client cannot
|
|
* send a Call message with a Position Zero Read chunk and a
|
|
* regular Read chunk at the same time.
|
|
*/
|
|
iptr = headerp->rm_body.rm_chunks;
|
|
iptr = rpcrdma_encode_read_list(r_xprt, req, rqst, iptr, rtype);
|
|
if (IS_ERR(iptr))
|
|
goto out_err;
|
|
iptr = rpcrdma_encode_write_list(r_xprt, req, rqst, iptr, wtype);
|
|
if (IS_ERR(iptr))
|
|
goto out_err;
|
|
iptr = rpcrdma_encode_reply_chunk(r_xprt, req, rqst, iptr, wtype);
|
|
if (IS_ERR(iptr))
|
|
goto out_err;
|
|
hdrlen = (unsigned char *)iptr - (unsigned char *)headerp;
|
|
|
|
dprintk("RPC: %5u %s: %s/%s: hdrlen %zd rpclen %zd\n",
|
|
rqst->rq_task->tk_pid, __func__,
|
|
transfertypes[rtype], transfertypes[wtype],
|
|
hdrlen, rpclen);
|
|
|
|
if (!rpcrdma_prepare_send_sges(&r_xprt->rx_ia, req, hdrlen,
|
|
&rqst->rq_snd_buf, rtype)) {
|
|
iptr = ERR_PTR(-EIO);
|
|
goto out_err;
|
|
}
|
|
return 0;
|
|
|
|
out_err:
|
|
pr_err("rpcrdma: rpcrdma_marshal_req failed, status %ld\n",
|
|
PTR_ERR(iptr));
|
|
r_xprt->rx_stats.failed_marshal_count++;
|
|
return PTR_ERR(iptr);
|
|
}
|
|
|
|
/*
|
|
* Chase down a received write or reply chunklist to get length
|
|
* RDMA'd by server. See map at rpcrdma_create_chunks()! :-)
|
|
*/
|
|
static int
|
|
rpcrdma_count_chunks(struct rpcrdma_rep *rep, int wrchunk, __be32 **iptrp)
|
|
{
|
|
unsigned int i, total_len;
|
|
struct rpcrdma_write_chunk *cur_wchunk;
|
|
char *base = (char *)rdmab_to_msg(rep->rr_rdmabuf);
|
|
|
|
i = be32_to_cpu(**iptrp);
|
|
cur_wchunk = (struct rpcrdma_write_chunk *) (*iptrp + 1);
|
|
total_len = 0;
|
|
while (i--) {
|
|
struct rpcrdma_segment *seg = &cur_wchunk->wc_target;
|
|
ifdebug(FACILITY) {
|
|
u64 off;
|
|
xdr_decode_hyper((__be32 *)&seg->rs_offset, &off);
|
|
dprintk("RPC: %s: chunk %d@0x%016llx:0x%08x\n",
|
|
__func__,
|
|
be32_to_cpu(seg->rs_length),
|
|
(unsigned long long)off,
|
|
be32_to_cpu(seg->rs_handle));
|
|
}
|
|
total_len += be32_to_cpu(seg->rs_length);
|
|
++cur_wchunk;
|
|
}
|
|
/* check and adjust for properly terminated write chunk */
|
|
if (wrchunk) {
|
|
__be32 *w = (__be32 *) cur_wchunk;
|
|
if (*w++ != xdr_zero)
|
|
return -1;
|
|
cur_wchunk = (struct rpcrdma_write_chunk *) w;
|
|
}
|
|
if ((char *)cur_wchunk > base + rep->rr_len)
|
|
return -1;
|
|
|
|
*iptrp = (__be32 *) cur_wchunk;
|
|
return total_len;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_inline_fixup - Scatter inline received data into rqst's iovecs
|
|
* @rqst: controlling RPC request
|
|
* @srcp: points to RPC message payload in receive buffer
|
|
* @copy_len: remaining length of receive buffer content
|
|
* @pad: Write chunk pad bytes needed (zero for pure inline)
|
|
*
|
|
* The upper layer has set the maximum number of bytes it can
|
|
* receive in each component of rq_rcv_buf. These values are set in
|
|
* the head.iov_len, page_len, tail.iov_len, and buflen fields.
|
|
*
|
|
* Unlike the TCP equivalent (xdr_partial_copy_from_skb), in
|
|
* many cases this function simply updates iov_base pointers in
|
|
* rq_rcv_buf to point directly to the received reply data, to
|
|
* avoid copying reply data.
|
|
*
|
|
* Returns the count of bytes which had to be memcopied.
|
|
*/
|
|
static unsigned long
|
|
rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
|
|
{
|
|
unsigned long fixup_copy_count;
|
|
int i, npages, curlen;
|
|
char *destp;
|
|
struct page **ppages;
|
|
int page_base;
|
|
|
|
/* The head iovec is redirected to the RPC reply message
|
|
* in the receive buffer, to avoid a memcopy.
|
|
*/
|
|
rqst->rq_rcv_buf.head[0].iov_base = srcp;
|
|
rqst->rq_private_buf.head[0].iov_base = srcp;
|
|
|
|
/* The contents of the receive buffer that follow
|
|
* head.iov_len bytes are copied into the page list.
|
|
*/
|
|
curlen = rqst->rq_rcv_buf.head[0].iov_len;
|
|
if (curlen > copy_len)
|
|
curlen = copy_len;
|
|
dprintk("RPC: %s: srcp 0x%p len %d hdrlen %d\n",
|
|
__func__, srcp, copy_len, curlen);
|
|
srcp += curlen;
|
|
copy_len -= curlen;
|
|
|
|
page_base = rqst->rq_rcv_buf.page_base;
|
|
ppages = rqst->rq_rcv_buf.pages + (page_base >> PAGE_SHIFT);
|
|
page_base &= ~PAGE_MASK;
|
|
fixup_copy_count = 0;
|
|
if (copy_len && rqst->rq_rcv_buf.page_len) {
|
|
int pagelist_len;
|
|
|
|
pagelist_len = rqst->rq_rcv_buf.page_len;
|
|
if (pagelist_len > copy_len)
|
|
pagelist_len = copy_len;
|
|
npages = PAGE_ALIGN(page_base + pagelist_len) >> PAGE_SHIFT;
|
|
for (i = 0; i < npages; i++) {
|
|
curlen = PAGE_SIZE - page_base;
|
|
if (curlen > pagelist_len)
|
|
curlen = pagelist_len;
|
|
|
|
dprintk("RPC: %s: page %d"
|
|
" srcp 0x%p len %d curlen %d\n",
|
|
__func__, i, srcp, copy_len, curlen);
|
|
destp = kmap_atomic(ppages[i]);
|
|
memcpy(destp + page_base, srcp, curlen);
|
|
flush_dcache_page(ppages[i]);
|
|
kunmap_atomic(destp);
|
|
srcp += curlen;
|
|
copy_len -= curlen;
|
|
fixup_copy_count += curlen;
|
|
pagelist_len -= curlen;
|
|
if (!pagelist_len)
|
|
break;
|
|
page_base = 0;
|
|
}
|
|
|
|
/* Implicit padding for the last segment in a Write
|
|
* chunk is inserted inline at the front of the tail
|
|
* iovec. The upper layer ignores the content of
|
|
* the pad. Simply ensure inline content in the tail
|
|
* that follows the Write chunk is properly aligned.
|
|
*/
|
|
if (pad)
|
|
srcp -= pad;
|
|
}
|
|
|
|
/* The tail iovec is redirected to the remaining data
|
|
* in the receive buffer, to avoid a memcopy.
|
|
*/
|
|
if (copy_len || pad) {
|
|
rqst->rq_rcv_buf.tail[0].iov_base = srcp;
|
|
rqst->rq_private_buf.tail[0].iov_base = srcp;
|
|
}
|
|
|
|
return fixup_copy_count;
|
|
}
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
/* By convention, backchannel calls arrive via rdma_msg type
|
|
* messages, and never populate the chunk lists. This makes
|
|
* the RPC/RDMA header small and fixed in size, so it is
|
|
* straightforward to check the RPC header's direction field.
|
|
*/
|
|
static bool
|
|
rpcrdma_is_bcall(struct rpcrdma_msg *headerp)
|
|
{
|
|
__be32 *p = (__be32 *)headerp;
|
|
|
|
if (headerp->rm_type != rdma_msg)
|
|
return false;
|
|
if (headerp->rm_body.rm_chunks[0] != xdr_zero)
|
|
return false;
|
|
if (headerp->rm_body.rm_chunks[1] != xdr_zero)
|
|
return false;
|
|
if (headerp->rm_body.rm_chunks[2] != xdr_zero)
|
|
return false;
|
|
|
|
/* sanity */
|
|
if (p[7] != headerp->rm_xid)
|
|
return false;
|
|
/* call direction */
|
|
if (p[8] != cpu_to_be32(RPC_CALL))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
/* Process received RPC/RDMA messages.
|
|
*
|
|
* Errors must result in the RPC task either being awakened, or
|
|
* allowed to timeout, to discover the errors at that time.
|
|
*/
|
|
void
|
|
rpcrdma_reply_handler(struct work_struct *work)
|
|
{
|
|
struct rpcrdma_rep *rep =
|
|
container_of(work, struct rpcrdma_rep, rr_work);
|
|
struct rpcrdma_msg *headerp;
|
|
struct rpcrdma_req *req;
|
|
struct rpc_rqst *rqst;
|
|
struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;
|
|
struct rpc_xprt *xprt = &r_xprt->rx_xprt;
|
|
__be32 *iptr;
|
|
int rdmalen, status, rmerr;
|
|
unsigned long cwnd;
|
|
|
|
dprintk("RPC: %s: incoming rep %p\n", __func__, rep);
|
|
|
|
if (rep->rr_len == RPCRDMA_BAD_LEN)
|
|
goto out_badstatus;
|
|
if (rep->rr_len < RPCRDMA_HDRLEN_ERR)
|
|
goto out_shortreply;
|
|
|
|
headerp = rdmab_to_msg(rep->rr_rdmabuf);
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
if (rpcrdma_is_bcall(headerp))
|
|
goto out_bcall;
|
|
#endif
|
|
|
|
/* Match incoming rpcrdma_rep to an rpcrdma_req to
|
|
* get context for handling any incoming chunks.
|
|
*/
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
rqst = xprt_lookup_rqst(xprt, headerp->rm_xid);
|
|
if (!rqst)
|
|
goto out_nomatch;
|
|
|
|
req = rpcr_to_rdmar(rqst);
|
|
if (req->rl_reply)
|
|
goto out_duplicate;
|
|
|
|
/* Sanity checking has passed. We are now committed
|
|
* to complete this transaction.
|
|
*/
|
|
list_del_init(&rqst->rq_list);
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
dprintk("RPC: %s: reply %p completes request %p (xid 0x%08x)\n",
|
|
__func__, rep, req, be32_to_cpu(headerp->rm_xid));
|
|
|
|
/* from here on, the reply is no longer an orphan */
|
|
req->rl_reply = rep;
|
|
xprt->reestablish_timeout = 0;
|
|
|
|
if (headerp->rm_vers != rpcrdma_version)
|
|
goto out_badversion;
|
|
|
|
/* check for expected message types */
|
|
/* The order of some of these tests is important. */
|
|
switch (headerp->rm_type) {
|
|
case rdma_msg:
|
|
/* never expect read chunks */
|
|
/* never expect reply chunks (two ways to check) */
|
|
/* never expect write chunks without having offered RDMA */
|
|
if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
|
|
(headerp->rm_body.rm_chunks[1] == xdr_zero &&
|
|
headerp->rm_body.rm_chunks[2] != xdr_zero) ||
|
|
(headerp->rm_body.rm_chunks[1] != xdr_zero &&
|
|
list_empty(&req->rl_registered)))
|
|
goto badheader;
|
|
if (headerp->rm_body.rm_chunks[1] != xdr_zero) {
|
|
/* count any expected write chunks in read reply */
|
|
/* start at write chunk array count */
|
|
iptr = &headerp->rm_body.rm_chunks[2];
|
|
rdmalen = rpcrdma_count_chunks(rep, 1, &iptr);
|
|
/* check for validity, and no reply chunk after */
|
|
if (rdmalen < 0 || *iptr++ != xdr_zero)
|
|
goto badheader;
|
|
rep->rr_len -=
|
|
((unsigned char *)iptr - (unsigned char *)headerp);
|
|
status = rep->rr_len + rdmalen;
|
|
r_xprt->rx_stats.total_rdma_reply += rdmalen;
|
|
/* special case - last chunk may omit padding */
|
|
if (rdmalen &= 3) {
|
|
rdmalen = 4 - rdmalen;
|
|
status += rdmalen;
|
|
}
|
|
} else {
|
|
/* else ordinary inline */
|
|
rdmalen = 0;
|
|
iptr = (__be32 *)((unsigned char *)headerp +
|
|
RPCRDMA_HDRLEN_MIN);
|
|
rep->rr_len -= RPCRDMA_HDRLEN_MIN;
|
|
status = rep->rr_len;
|
|
}
|
|
|
|
r_xprt->rx_stats.fixup_copy_count +=
|
|
rpcrdma_inline_fixup(rqst, (char *)iptr, rep->rr_len,
|
|
rdmalen);
|
|
break;
|
|
|
|
case rdma_nomsg:
|
|
/* never expect read or write chunks, always reply chunks */
|
|
if (headerp->rm_body.rm_chunks[0] != xdr_zero ||
|
|
headerp->rm_body.rm_chunks[1] != xdr_zero ||
|
|
headerp->rm_body.rm_chunks[2] != xdr_one ||
|
|
list_empty(&req->rl_registered))
|
|
goto badheader;
|
|
iptr = (__be32 *)((unsigned char *)headerp +
|
|
RPCRDMA_HDRLEN_MIN);
|
|
rdmalen = rpcrdma_count_chunks(rep, 0, &iptr);
|
|
if (rdmalen < 0)
|
|
goto badheader;
|
|
r_xprt->rx_stats.total_rdma_reply += rdmalen;
|
|
/* Reply chunk buffer already is the reply vector - no fixup. */
|
|
status = rdmalen;
|
|
break;
|
|
|
|
case rdma_error:
|
|
goto out_rdmaerr;
|
|
|
|
badheader:
|
|
default:
|
|
dprintk("RPC: %5u %s: invalid rpcrdma reply (type %u)\n",
|
|
rqst->rq_task->tk_pid, __func__,
|
|
be32_to_cpu(headerp->rm_type));
|
|
status = -EIO;
|
|
r_xprt->rx_stats.bad_reply_count++;
|
|
break;
|
|
}
|
|
|
|
out:
|
|
/* Invalidate and flush the data payloads before waking the
|
|
* waiting application. This guarantees the memory region is
|
|
* properly fenced from the server before the application
|
|
* accesses the data. It also ensures proper send flow
|
|
* control: waking the next RPC waits until this RPC has
|
|
* relinquished all its Send Queue entries.
|
|
*/
|
|
if (!list_empty(&req->rl_registered))
|
|
r_xprt->rx_ia.ri_ops->ro_unmap_sync(r_xprt, req);
|
|
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
cwnd = xprt->cwnd;
|
|
xprt->cwnd = atomic_read(&r_xprt->rx_buf.rb_credits) << RPC_CWNDSHIFT;
|
|
if (xprt->cwnd > cwnd)
|
|
xprt_release_rqst_cong(rqst->rq_task);
|
|
|
|
xprt_complete_rqst(rqst->rq_task, status);
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
dprintk("RPC: %s: xprt_complete_rqst(0x%p, 0x%p, %d)\n",
|
|
__func__, xprt, rqst, status);
|
|
return;
|
|
|
|
out_badstatus:
|
|
rpcrdma_recv_buffer_put(rep);
|
|
if (r_xprt->rx_ep.rep_connected == 1) {
|
|
r_xprt->rx_ep.rep_connected = -EIO;
|
|
rpcrdma_conn_func(&r_xprt->rx_ep);
|
|
}
|
|
return;
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
out_bcall:
|
|
rpcrdma_bc_receive_call(r_xprt, rep);
|
|
return;
|
|
#endif
|
|
|
|
/* If the incoming reply terminated a pending RPC, the next
|
|
* RPC call will post a replacement receive buffer as it is
|
|
* being marshaled.
|
|
*/
|
|
out_badversion:
|
|
dprintk("RPC: %s: invalid version %d\n",
|
|
__func__, be32_to_cpu(headerp->rm_vers));
|
|
status = -EIO;
|
|
r_xprt->rx_stats.bad_reply_count++;
|
|
goto out;
|
|
|
|
out_rdmaerr:
|
|
rmerr = be32_to_cpu(headerp->rm_body.rm_error.rm_err);
|
|
switch (rmerr) {
|
|
case ERR_VERS:
|
|
pr_err("%s: server reports header version error (%u-%u)\n",
|
|
__func__,
|
|
be32_to_cpu(headerp->rm_body.rm_error.rm_vers_low),
|
|
be32_to_cpu(headerp->rm_body.rm_error.rm_vers_high));
|
|
break;
|
|
case ERR_CHUNK:
|
|
pr_err("%s: server reports header decoding error\n",
|
|
__func__);
|
|
break;
|
|
default:
|
|
pr_err("%s: server reports unknown error %d\n",
|
|
__func__, rmerr);
|
|
}
|
|
status = -EREMOTEIO;
|
|
r_xprt->rx_stats.bad_reply_count++;
|
|
goto out;
|
|
|
|
/* If no pending RPC transaction was matched, post a replacement
|
|
* receive buffer before returning.
|
|
*/
|
|
out_shortreply:
|
|
dprintk("RPC: %s: short/invalid reply\n", __func__);
|
|
goto repost;
|
|
|
|
out_nomatch:
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
dprintk("RPC: %s: no match for incoming xid 0x%08x len %d\n",
|
|
__func__, be32_to_cpu(headerp->rm_xid),
|
|
rep->rr_len);
|
|
goto repost;
|
|
|
|
out_duplicate:
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
dprintk("RPC: %s: "
|
|
"duplicate reply %p to RPC request %p: xid 0x%08x\n",
|
|
__func__, rep, req, be32_to_cpu(headerp->rm_xid));
|
|
|
|
repost:
|
|
r_xprt->rx_stats.bad_reply_count++;
|
|
if (rpcrdma_ep_post_recv(&r_xprt->rx_ia, rep))
|
|
rpcrdma_recv_buffer_put(rep);
|
|
}
|