546 lines
16 KiB
C
546 lines
16 KiB
C
/*
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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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/*
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* Replace the pages in the rq_argpages array with the pages from the SGE in
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* the RDMA_RECV completion. The SGL should contain full pages up until the
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* last one.
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*/
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static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
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struct svc_rdma_op_ctxt *ctxt,
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u32 byte_count)
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{
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struct page *page;
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u32 bc;
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int sge_no;
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/* Swap the page in the SGE with the page in argpages */
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page = ctxt->pages[0];
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put_page(rqstp->rq_pages[0]);
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rqstp->rq_pages[0] = page;
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/* Set up the XDR head */
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rqstp->rq_arg.head[0].iov_base = page_address(page);
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rqstp->rq_arg.head[0].iov_len = min(byte_count, ctxt->sge[0].length);
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rqstp->rq_arg.len = byte_count;
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rqstp->rq_arg.buflen = byte_count;
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/* Compute bytes past head in the SGL */
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bc = byte_count - rqstp->rq_arg.head[0].iov_len;
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/* If data remains, store it in the pagelist */
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rqstp->rq_arg.page_len = bc;
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rqstp->rq_arg.page_base = 0;
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rqstp->rq_arg.pages = &rqstp->rq_pages[1];
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sge_no = 1;
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while (bc && sge_no < ctxt->count) {
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page = ctxt->pages[sge_no];
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put_page(rqstp->rq_pages[sge_no]);
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rqstp->rq_pages[sge_no] = page;
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bc -= min(bc, ctxt->sge[sge_no].length);
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rqstp->rq_arg.buflen += ctxt->sge[sge_no].length;
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sge_no++;
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}
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rqstp->rq_respages = &rqstp->rq_pages[sge_no];
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/* We should never run out of SGE because the limit is defined to
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* support the max allowed RPC data length
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*/
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BUG_ON(bc && (sge_no == ctxt->count));
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BUG_ON((rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len)
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!= byte_count);
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BUG_ON(rqstp->rq_arg.len != byte_count);
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/* If not all pages were used from the SGL, free the remaining ones */
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bc = sge_no;
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while (sge_no < ctxt->count) {
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page = ctxt->pages[sge_no++];
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put_page(page);
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}
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ctxt->count = bc;
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/* Set up tail */
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rqstp->rq_arg.tail[0].iov_base = NULL;
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rqstp->rq_arg.tail[0].iov_len = 0;
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}
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struct chunk_sge {
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int start; /* sge no for this chunk */
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int count; /* sge count for this chunk */
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};
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/* Encode a read-chunk-list as an array of IB SGE
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*
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* Assumptions:
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* - chunk[0]->position points to pages[0] at an offset of 0
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* - pages[] is not physically or virtually contigous and consists of
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* PAGE_SIZE elements.
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*
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* Output:
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* - sge array pointing into pages[] array.
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* - chunk_sge array specifying sge index and count for each
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* chunk in the read list
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*
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*/
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static int rdma_rcl_to_sge(struct svcxprt_rdma *xprt,
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struct svc_rqst *rqstp,
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struct svc_rdma_op_ctxt *head,
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struct rpcrdma_msg *rmsgp,
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struct ib_sge *sge,
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struct chunk_sge *ch_sge_ary,
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int ch_count,
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int byte_count)
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{
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int sge_no;
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int sge_bytes;
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int page_off;
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int page_no;
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int ch_bytes;
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int ch_no;
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struct rpcrdma_read_chunk *ch;
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sge_no = 0;
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page_no = 0;
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page_off = 0;
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ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
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ch_no = 0;
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ch_bytes = ch->rc_target.rs_length;
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head->arg.head[0] = rqstp->rq_arg.head[0];
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head->arg.tail[0] = rqstp->rq_arg.tail[0];
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head->arg.pages = &head->pages[head->count];
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head->sge[0].length = head->count; /* save count of hdr pages */
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head->arg.page_base = 0;
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head->arg.page_len = ch_bytes;
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head->arg.len = rqstp->rq_arg.len + ch_bytes;
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head->arg.buflen = rqstp->rq_arg.buflen + ch_bytes;
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head->count++;
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ch_sge_ary[0].start = 0;
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while (byte_count) {
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sge_bytes = min_t(int, PAGE_SIZE-page_off, ch_bytes);
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sge[sge_no].addr =
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ib_dma_map_page(xprt->sc_cm_id->device,
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rqstp->rq_arg.pages[page_no],
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page_off, sge_bytes,
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DMA_FROM_DEVICE);
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sge[sge_no].length = sge_bytes;
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sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
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/*
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* Don't bump head->count here because the same page
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* may be used by multiple SGE.
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*/
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head->arg.pages[page_no] = rqstp->rq_arg.pages[page_no];
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rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
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byte_count -= sge_bytes;
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ch_bytes -= sge_bytes;
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sge_no++;
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/*
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* If all bytes for this chunk have been mapped to an
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* SGE, move to the next SGE
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*/
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if (ch_bytes == 0) {
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ch_sge_ary[ch_no].count =
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sge_no - ch_sge_ary[ch_no].start;
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ch_no++;
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ch++;
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ch_sge_ary[ch_no].start = sge_no;
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ch_bytes = ch->rc_target.rs_length;
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/* If bytes remaining account for next chunk */
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if (byte_count) {
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head->arg.page_len += ch_bytes;
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head->arg.len += ch_bytes;
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head->arg.buflen += ch_bytes;
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}
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}
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/*
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* If this SGE consumed all of the page, move to the
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* next page
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*/
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if ((sge_bytes + page_off) == PAGE_SIZE) {
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page_no++;
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page_off = 0;
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/*
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* If there are still bytes left to map, bump
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* the page count
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*/
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if (byte_count)
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head->count++;
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} else
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page_off += sge_bytes;
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}
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BUG_ON(byte_count != 0);
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return sge_no;
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}
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static void rdma_set_ctxt_sge(struct svc_rdma_op_ctxt *ctxt,
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struct ib_sge *sge,
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u64 *sgl_offset,
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int count)
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{
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int i;
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ctxt->count = count;
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for (i = 0; i < count; i++) {
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ctxt->sge[i].addr = sge[i].addr;
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ctxt->sge[i].length = sge[i].length;
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*sgl_offset = *sgl_offset + sge[i].length;
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}
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}
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static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
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{
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if ((RDMA_TRANSPORT_IWARP ==
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rdma_node_get_transport(xprt->sc_cm_id->
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device->node_type))
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&& sge_count > 1)
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return 1;
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else
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return min_t(int, sge_count, xprt->sc_max_sge);
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}
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/*
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* Use RDMA_READ to read data from the advertised client buffer into the
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* XDR stream starting at rq_arg.head[0].iov_base.
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* Each chunk in the array
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* contains the following fields:
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* discrim - '1', This isn't used for data placement
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* position - The xdr stream offset (the same for every chunk)
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* handle - RMR for client memory region
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* length - data transfer length
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* offset - 64 bit tagged offset in remote memory region
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*
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* On our side, we need to read into a pagelist. The first page immediately
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* follows the RPC header.
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*
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* This function returns:
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* 0 - No error and no read-list found.
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*
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* 1 - Successful read-list processing. The data is not yet in
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* the pagelist and therefore the RPC request must be deferred. The
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* I/O completion will enqueue the transport again and
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* svc_rdma_recvfrom will complete the request.
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*
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* <0 - Error processing/posting read-list.
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*
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* NOTE: The ctxt must not be touched after the last WR has been posted
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* because the I/O completion processing may occur on another
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* processor and free / modify the context. Ne touche pas!
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*/
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static int rdma_read_xdr(struct svcxprt_rdma *xprt,
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struct rpcrdma_msg *rmsgp,
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struct svc_rqst *rqstp,
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struct svc_rdma_op_ctxt *hdr_ctxt)
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{
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struct ib_send_wr read_wr;
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int err = 0;
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int ch_no;
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struct ib_sge *sge;
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int ch_count;
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int byte_count;
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int sge_count;
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u64 sgl_offset;
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struct rpcrdma_read_chunk *ch;
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struct svc_rdma_op_ctxt *ctxt = NULL;
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struct svc_rdma_op_ctxt *tmp_sge_ctxt;
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struct svc_rdma_op_ctxt *tmp_ch_ctxt;
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struct chunk_sge *ch_sge_ary;
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/* If no read list is present, return 0 */
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ch = svc_rdma_get_read_chunk(rmsgp);
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if (!ch)
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return 0;
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/* Allocate temporary contexts to keep SGE */
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BUG_ON(sizeof(struct ib_sge) < sizeof(struct chunk_sge));
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tmp_sge_ctxt = svc_rdma_get_context(xprt);
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sge = tmp_sge_ctxt->sge;
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tmp_ch_ctxt = svc_rdma_get_context(xprt);
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ch_sge_ary = (struct chunk_sge *)tmp_ch_ctxt->sge;
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svc_rdma_rcl_chunk_counts(ch, &ch_count, &byte_count);
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if (ch_count > RPCSVC_MAXPAGES)
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return -EINVAL;
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sge_count = rdma_rcl_to_sge(xprt, rqstp, hdr_ctxt, rmsgp,
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sge, ch_sge_ary,
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ch_count, byte_count);
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sgl_offset = 0;
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ch_no = 0;
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for (ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
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ch->rc_discrim != 0; ch++, ch_no++) {
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next_sge:
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ctxt = svc_rdma_get_context(xprt);
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ctxt->direction = DMA_FROM_DEVICE;
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clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
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/* Prepare READ WR */
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memset(&read_wr, 0, sizeof read_wr);
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ctxt->wr_op = IB_WR_RDMA_READ;
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read_wr.wr_id = (unsigned long)ctxt;
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read_wr.opcode = IB_WR_RDMA_READ;
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read_wr.send_flags = IB_SEND_SIGNALED;
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read_wr.wr.rdma.rkey = ch->rc_target.rs_handle;
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read_wr.wr.rdma.remote_addr =
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get_unaligned(&(ch->rc_target.rs_offset)) +
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sgl_offset;
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read_wr.sg_list = &sge[ch_sge_ary[ch_no].start];
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read_wr.num_sge =
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rdma_read_max_sge(xprt, ch_sge_ary[ch_no].count);
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rdma_set_ctxt_sge(ctxt, &sge[ch_sge_ary[ch_no].start],
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&sgl_offset,
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read_wr.num_sge);
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if (((ch+1)->rc_discrim == 0) &&
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(read_wr.num_sge == ch_sge_ary[ch_no].count)) {
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/*
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* Mark the last RDMA_READ with a bit to
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* indicate all RPC data has been fetched from
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* the client and the RPC needs to be enqueued.
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*/
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set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
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ctxt->read_hdr = hdr_ctxt;
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}
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/* Post the read */
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err = svc_rdma_send(xprt, &read_wr);
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if (err) {
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printk(KERN_ERR "svcrdma: Error %d posting RDMA_READ\n",
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err);
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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svc_rdma_put_context(ctxt, 0);
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goto out;
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}
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atomic_inc(&rdma_stat_read);
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if (read_wr.num_sge < ch_sge_ary[ch_no].count) {
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ch_sge_ary[ch_no].count -= read_wr.num_sge;
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ch_sge_ary[ch_no].start += read_wr.num_sge;
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goto next_sge;
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}
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sgl_offset = 0;
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err = 1;
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}
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out:
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svc_rdma_put_context(tmp_sge_ctxt, 0);
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svc_rdma_put_context(tmp_ch_ctxt, 0);
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/* Detach arg pages. svc_recv will replenish them */
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for (ch_no = 0; &rqstp->rq_pages[ch_no] < rqstp->rq_respages; ch_no++)
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rqstp->rq_pages[ch_no] = NULL;
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/*
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* Detach res pages. svc_release must see a resused count of
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* zero or it will attempt to put them.
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*/
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while (rqstp->rq_resused)
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rqstp->rq_respages[--rqstp->rq_resused] = NULL;
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return err;
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}
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static int rdma_read_complete(struct svc_rqst *rqstp,
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struct svc_rdma_op_ctxt *head)
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{
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int page_no;
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int ret;
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BUG_ON(!head);
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/* Copy RPC pages */
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for (page_no = 0; page_no < head->count; page_no++) {
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put_page(rqstp->rq_pages[page_no]);
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rqstp->rq_pages[page_no] = head->pages[page_no];
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}
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/* Point rq_arg.pages past header */
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rqstp->rq_arg.pages = &rqstp->rq_pages[head->sge[0].length];
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rqstp->rq_arg.page_len = head->arg.page_len;
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rqstp->rq_arg.page_base = head->arg.page_base;
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/* rq_respages starts after the last arg page */
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rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
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rqstp->rq_resused = 0;
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/* Rebuild rq_arg head and tail. */
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rqstp->rq_arg.head[0] = head->arg.head[0];
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rqstp->rq_arg.tail[0] = head->arg.tail[0];
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rqstp->rq_arg.len = head->arg.len;
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rqstp->rq_arg.buflen = head->arg.buflen;
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/* Free the context */
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svc_rdma_put_context(head, 0);
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/* XXX: What should this be? */
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rqstp->rq_prot = IPPROTO_MAX;
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svc_xprt_copy_addrs(rqstp, rqstp->rq_xprt);
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ret = rqstp->rq_arg.head[0].iov_len
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+ rqstp->rq_arg.page_len
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+ rqstp->rq_arg.tail[0].iov_len;
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dprintk("svcrdma: deferred read ret=%d, rq_arg.len =%d, "
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"rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len = %zd\n",
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ret, rqstp->rq_arg.len, rqstp->rq_arg.head[0].iov_base,
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rqstp->rq_arg.head[0].iov_len);
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svc_xprt_received(rqstp->rq_xprt);
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return ret;
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}
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/*
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* Set up the rqstp thread context to point to the RQ buffer. If
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* necessary, pull additional data from the client with an RDMA_READ
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* request.
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*/
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int svc_rdma_recvfrom(struct svc_rqst *rqstp)
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{
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struct svc_xprt *xprt = rqstp->rq_xprt;
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struct svcxprt_rdma *rdma_xprt =
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container_of(xprt, struct svcxprt_rdma, sc_xprt);
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struct svc_rdma_op_ctxt *ctxt = NULL;
|
|
struct rpcrdma_msg *rmsgp;
|
|
int ret = 0;
|
|
int len;
|
|
|
|
dprintk("svcrdma: rqstp=%p\n", rqstp);
|
|
|
|
spin_lock_bh(&rdma_xprt->sc_read_complete_lock);
|
|
if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
|
|
ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
|
|
struct svc_rdma_op_ctxt,
|
|
dto_q);
|
|
list_del_init(&ctxt->dto_q);
|
|
}
|
|
spin_unlock_bh(&rdma_xprt->sc_read_complete_lock);
|
|
if (ctxt)
|
|
return rdma_read_complete(rqstp, ctxt);
|
|
|
|
spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
|
|
if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
|
|
ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
|
|
struct svc_rdma_op_ctxt,
|
|
dto_q);
|
|
list_del_init(&ctxt->dto_q);
|
|
} else {
|
|
atomic_inc(&rdma_stat_rq_starve);
|
|
clear_bit(XPT_DATA, &xprt->xpt_flags);
|
|
ctxt = NULL;
|
|
}
|
|
spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
|
|
if (!ctxt) {
|
|
/* This is the EAGAIN path. The svc_recv routine will
|
|
* return -EAGAIN, the nfsd thread will go to call into
|
|
* svc_recv again and we shouldn't be on the active
|
|
* transport list
|
|
*/
|
|
if (test_bit(XPT_CLOSE, &xprt->xpt_flags))
|
|
goto close_out;
|
|
|
|
BUG_ON(ret);
|
|
goto out;
|
|
}
|
|
dprintk("svcrdma: processing ctxt=%p on xprt=%p, rqstp=%p, status=%d\n",
|
|
ctxt, rdma_xprt, rqstp, ctxt->wc_status);
|
|
BUG_ON(ctxt->wc_status != IB_WC_SUCCESS);
|
|
atomic_inc(&rdma_stat_recv);
|
|
|
|
/* Build up the XDR from the receive buffers. */
|
|
rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len);
|
|
|
|
/* Decode the RDMA header. */
|
|
len = svc_rdma_xdr_decode_req(&rmsgp, rqstp);
|
|
rqstp->rq_xprt_hlen = len;
|
|
|
|
/* If the request is invalid, reply with an error */
|
|
if (len < 0) {
|
|
if (len == -ENOSYS)
|
|
svc_rdma_send_error(rdma_xprt, rmsgp, ERR_VERS);
|
|
goto close_out;
|
|
}
|
|
|
|
/* Read read-list data. */
|
|
ret = rdma_read_xdr(rdma_xprt, rmsgp, rqstp, ctxt);
|
|
if (ret > 0) {
|
|
/* read-list posted, defer until data received from client. */
|
|
svc_xprt_received(xprt);
|
|
return 0;
|
|
}
|
|
if (ret < 0) {
|
|
/* Post of read-list failed, free context. */
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return 0;
|
|
}
|
|
|
|
ret = rqstp->rq_arg.head[0].iov_len
|
|
+ rqstp->rq_arg.page_len
|
|
+ rqstp->rq_arg.tail[0].iov_len;
|
|
svc_rdma_put_context(ctxt, 0);
|
|
out:
|
|
dprintk("svcrdma: ret = %d, rq_arg.len =%d, "
|
|
"rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len = %zd\n",
|
|
ret, rqstp->rq_arg.len,
|
|
rqstp->rq_arg.head[0].iov_base,
|
|
rqstp->rq_arg.head[0].iov_len);
|
|
rqstp->rq_prot = IPPROTO_MAX;
|
|
svc_xprt_copy_addrs(rqstp, xprt);
|
|
svc_xprt_received(xprt);
|
|
return ret;
|
|
|
|
close_out:
|
|
if (ctxt)
|
|
svc_rdma_put_context(ctxt, 1);
|
|
dprintk("svcrdma: transport %p is closing\n", xprt);
|
|
/*
|
|
* Set the close bit and enqueue it. svc_recv will see the
|
|
* close bit and call svc_xprt_delete
|
|
*/
|
|
set_bit(XPT_CLOSE, &xprt->xpt_flags);
|
|
svc_xprt_received(xprt);
|
|
return 0;
|
|
}
|