![Chuck Lever](/assets/img/avatar_default.png)
Clean up: The value of the byte_count parameter is already passed to rdma_build_arg_xdr as part of the svc_rdma_op_ctxt structure. Further, without the parameter called "byte_count" there is no need to have the abbreviated "bc" automatic variable. "bc" can now be called something more intuitive. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
588 lines
16 KiB
C
588 lines
16 KiB
C
/*
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* Copyright (c) 2016, 2017 Oracle. All rights reserved.
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* Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
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* Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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/* Operation
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*
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* The main entry point is svc_rdma_recvfrom. This is called from
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* svc_recv when the transport indicates there is incoming data to
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* be read. "Data Ready" is signaled when an RDMA Receive completes,
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* or when a set of RDMA Reads complete.
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*
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* An svc_rqst is passed in. This structure contains an array of
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* free pages (rq_pages) that will contain the incoming RPC message.
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*
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* Short messages are moved directly into svc_rqst::rq_arg, and
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* the RPC Call is ready to be processed by the Upper Layer.
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* svc_rdma_recvfrom returns the length of the RPC Call message,
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* completing the reception of the RPC Call.
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*
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* However, when an incoming message has Read chunks,
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* svc_rdma_recvfrom must post RDMA Reads to pull the RPC Call's
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* data payload from the client. svc_rdma_recvfrom sets up the
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* RDMA Reads using pages in svc_rqst::rq_pages, which are
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* transferred to an svc_rdma_op_ctxt for the duration of the
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* I/O. svc_rdma_recvfrom then returns zero, since the RPC message
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* is still not yet ready.
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*
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* When the Read chunk payloads have become available on the
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* server, "Data Ready" is raised again, and svc_recv calls
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* svc_rdma_recvfrom again. This second call may use a different
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* svc_rqst than the first one, thus any information that needs
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* to be preserved across these two calls is kept in an
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* svc_rdma_op_ctxt.
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*
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* The second call to svc_rdma_recvfrom performs final assembly
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* of the RPC Call message, using the RDMA Read sink pages kept in
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* the svc_rdma_op_ctxt. The xdr_buf is copied from the
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* svc_rdma_op_ctxt to the second svc_rqst. The second call returns
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* the length of the completed RPC Call message.
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*
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* Page Management
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*
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* Pages under I/O must be transferred from the first svc_rqst to an
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* svc_rdma_op_ctxt before the first svc_rdma_recvfrom call returns.
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*
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* The first svc_rqst supplies pages for RDMA Reads. These are moved
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* from rqstp::rq_pages into ctxt::pages. The consumed elements of
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* the rq_pages array are set to NULL and refilled with the first
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* svc_rdma_recvfrom call returns.
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*
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* During the second svc_rdma_recvfrom call, RDMA Read sink pages
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* are transferred from the svc_rdma_op_ctxt to the second svc_rqst
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* (see rdma_read_complete() below).
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*/
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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/spinlock.h>
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#include <linux/sunrpc/xdr.h>
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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/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 svc_rdma_build_arg_xdr(struct svc_rqst *rqstp,
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struct svc_rdma_op_ctxt *ctxt)
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{
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struct page *page;
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int sge_no;
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u32 len;
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/* The reply path assumes the Call's transport header resides
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* in rqstp->rq_pages[0].
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*/
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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 =
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min_t(size_t, ctxt->byte_len, ctxt->sge[0].length);
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rqstp->rq_arg.len = ctxt->byte_len;
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rqstp->rq_arg.buflen = ctxt->byte_len;
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/* Compute bytes past head in the SGL */
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len = ctxt->byte_len - 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 = len;
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rqstp->rq_arg.page_base = 0;
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sge_no = 1;
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while (len && 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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len -= min_t(u32, len, 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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rqstp->rq_next_page = rqstp->rq_respages + 1;
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/* If not all pages were used from the SGL, free the remaining ones */
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len = 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 = len;
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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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/* This accommodates the largest possible Write chunk,
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* in one segment.
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*/
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#define MAX_BYTES_WRITE_SEG ((u32)(RPCSVC_MAXPAGES << PAGE_SHIFT))
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/* This accommodates the largest possible Position-Zero
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* Read chunk or Reply chunk, in one segment.
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*/
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#define MAX_BYTES_SPECIAL_SEG ((u32)((RPCSVC_MAXPAGES + 2) << PAGE_SHIFT))
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/* Sanity check the Read list.
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*
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* Implementation limits:
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* - This implementation supports only one Read chunk.
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*
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* Sanity checks:
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* - Read list does not overflow buffer.
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* - Segment size limited by largest NFS data payload.
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*
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* The segment count is limited to how many segments can
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* fit in the transport header without overflowing the
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* buffer. That's about 40 Read segments for a 1KB inline
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* threshold.
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*
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* Returns pointer to the following Write list.
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*/
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static __be32 *xdr_check_read_list(__be32 *p, const __be32 *end)
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{
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u32 position;
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bool first;
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first = true;
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while (*p++ != xdr_zero) {
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if (first) {
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position = be32_to_cpup(p++);
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first = false;
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} else if (be32_to_cpup(p++) != position) {
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return NULL;
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}
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p++; /* handle */
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if (be32_to_cpup(p++) > MAX_BYTES_SPECIAL_SEG)
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return NULL;
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p += 2; /* offset */
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if (p > end)
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return NULL;
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}
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return p;
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}
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/* The segment count is limited to how many segments can
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* fit in the transport header without overflowing the
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* buffer. That's about 60 Write segments for a 1KB inline
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* threshold.
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*/
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static __be32 *xdr_check_write_chunk(__be32 *p, const __be32 *end,
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u32 maxlen)
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{
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u32 i, segcount;
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segcount = be32_to_cpup(p++);
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for (i = 0; i < segcount; i++) {
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p++; /* handle */
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if (be32_to_cpup(p++) > maxlen)
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return NULL;
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p += 2; /* offset */
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if (p > end)
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return NULL;
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}
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return p;
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}
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/* Sanity check the Write list.
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*
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* Implementation limits:
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* - This implementation supports only one Write chunk.
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*
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* Sanity checks:
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* - Write list does not overflow buffer.
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* - Segment size limited by largest NFS data payload.
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*
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* Returns pointer to the following Reply chunk.
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*/
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static __be32 *xdr_check_write_list(__be32 *p, const __be32 *end)
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{
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u32 chcount;
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chcount = 0;
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while (*p++ != xdr_zero) {
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p = xdr_check_write_chunk(p, end, MAX_BYTES_WRITE_SEG);
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if (!p)
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return NULL;
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if (chcount++ > 1)
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return NULL;
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}
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return p;
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}
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/* Sanity check the Reply chunk.
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*
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* Sanity checks:
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* - Reply chunk does not overflow buffer.
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* - Segment size limited by largest NFS data payload.
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*
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* Returns pointer to the following RPC header.
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*/
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static __be32 *xdr_check_reply_chunk(__be32 *p, const __be32 *end)
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{
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if (*p++ != xdr_zero) {
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p = xdr_check_write_chunk(p, end, MAX_BYTES_SPECIAL_SEG);
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if (!p)
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return NULL;
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}
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return p;
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}
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/* On entry, xdr->head[0].iov_base points to first byte in the
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* RPC-over-RDMA header.
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*
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* On successful exit, head[0] points to first byte past the
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* RPC-over-RDMA header. For RDMA_MSG, this is the RPC message.
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* The length of the RPC-over-RDMA header is returned.
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*
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* Assumptions:
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* - The transport header is entirely contained in the head iovec.
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*/
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static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
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{
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__be32 *p, *end, *rdma_argp;
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unsigned int hdr_len;
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char *proc;
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/* Verify that there's enough bytes for header + something */
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if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
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goto out_short;
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rdma_argp = rq_arg->head[0].iov_base;
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if (*(rdma_argp + 1) != rpcrdma_version)
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goto out_version;
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switch (*(rdma_argp + 3)) {
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case rdma_msg:
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proc = "RDMA_MSG";
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break;
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case rdma_nomsg:
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proc = "RDMA_NOMSG";
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break;
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case rdma_done:
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goto out_drop;
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case rdma_error:
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goto out_drop;
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default:
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goto out_proc;
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}
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end = (__be32 *)((unsigned long)rdma_argp + rq_arg->len);
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p = xdr_check_read_list(rdma_argp + 4, end);
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if (!p)
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goto out_inval;
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p = xdr_check_write_list(p, end);
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if (!p)
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goto out_inval;
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p = xdr_check_reply_chunk(p, end);
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if (!p)
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goto out_inval;
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if (p > end)
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goto out_inval;
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rq_arg->head[0].iov_base = p;
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hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
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rq_arg->head[0].iov_len -= hdr_len;
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rq_arg->len -= hdr_len;
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dprintk("svcrdma: received %s request for XID 0x%08x, hdr_len=%u\n",
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proc, be32_to_cpup(rdma_argp), hdr_len);
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return hdr_len;
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out_short:
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dprintk("svcrdma: header too short = %d\n", rq_arg->len);
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return -EINVAL;
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out_version:
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dprintk("svcrdma: bad xprt version: %u\n",
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be32_to_cpup(rdma_argp + 1));
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return -EPROTONOSUPPORT;
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out_drop:
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dprintk("svcrdma: dropping RDMA_DONE/ERROR message\n");
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return 0;
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out_proc:
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dprintk("svcrdma: bad rdma procedure (%u)\n",
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be32_to_cpup(rdma_argp + 3));
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return -EINVAL;
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out_inval:
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dprintk("svcrdma: failed to parse transport header\n");
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return -EINVAL;
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}
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static void 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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/* 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->hdr_count];
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rqstp->rq_arg.page_len = head->arg.page_len;
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/* rq_respages starts after the last arg page */
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rqstp->rq_respages = &rqstp->rq_pages[page_no];
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rqstp->rq_next_page = rqstp->rq_respages + 1;
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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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}
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static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
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__be32 *rdma_argp, int status)
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{
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struct svc_rdma_op_ctxt *ctxt;
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__be32 *p, *err_msgp;
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unsigned int length;
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struct page *page;
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int ret;
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page = alloc_page(GFP_KERNEL);
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if (!page)
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return;
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err_msgp = page_address(page);
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p = err_msgp;
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*p++ = *rdma_argp;
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*p++ = *(rdma_argp + 1);
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*p++ = xprt->sc_fc_credits;
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*p++ = rdma_error;
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if (status == -EPROTONOSUPPORT) {
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*p++ = err_vers;
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*p++ = rpcrdma_version;
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*p++ = rpcrdma_version;
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} else {
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*p++ = err_chunk;
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}
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length = (unsigned long)p - (unsigned long)err_msgp;
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/* Map transport header; no RPC message payload */
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ctxt = svc_rdma_get_context(xprt);
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ret = svc_rdma_map_reply_hdr(xprt, ctxt, err_msgp, length);
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if (ret) {
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dprintk("svcrdma: Error %d mapping send for protocol error\n",
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ret);
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return;
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}
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ret = svc_rdma_post_send_wr(xprt, ctxt, 1, 0);
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if (ret) {
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dprintk("svcrdma: Error %d posting send for protocol error\n",
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ret);
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svc_rdma_unmap_dma(ctxt);
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svc_rdma_put_context(ctxt, 1);
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}
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}
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/* By convention, backchannel calls arrive via rdma_msg type
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* messages, and never populate the chunk lists. This makes
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* the RPC/RDMA header small and fixed in size, so it is
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* straightforward to check the RPC header's direction field.
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*/
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static bool svc_rdma_is_backchannel_reply(struct svc_xprt *xprt,
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__be32 *rdma_resp)
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{
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__be32 *p;
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if (!xprt->xpt_bc_xprt)
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return false;
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p = rdma_resp + 3;
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if (*p++ != rdma_msg)
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return false;
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if (*p++ != xdr_zero)
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return false;
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if (*p++ != xdr_zero)
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return false;
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if (*p++ != xdr_zero)
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return false;
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/* XID sanity */
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if (*p++ != *rdma_resp)
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return false;
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/* call direction */
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if (*p == cpu_to_be32(RPC_CALL))
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return false;
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return true;
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}
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/**
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* svc_rdma_recvfrom - Receive an RPC call
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* @rqstp: request structure into which to receive an RPC Call
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*
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* Returns:
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* The positive number of bytes in the RPC Call message,
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* %0 if there were no Calls ready to return,
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* %-EINVAL if the Read chunk data is too large,
|
|
* %-ENOMEM if rdma_rw context pool was exhausted,
|
|
* %-ENOTCONN if posting failed (connection is lost),
|
|
* %-EIO if rdma_rw initialization failed (DMA mapping, etc).
|
|
*
|
|
* Called in a loop when XPT_DATA is set. XPT_DATA is cleared only
|
|
* when there are no remaining ctxt's to process.
|
|
*
|
|
* The next ctxt is removed from the "receive" lists.
|
|
*
|
|
* - If the ctxt completes a Read, then finish assembling the Call
|
|
* message and return the number of bytes in the message.
|
|
*
|
|
* - If the ctxt completes a Receive, then construct the Call
|
|
* message from the contents of the Receive buffer.
|
|
*
|
|
* - If there are no Read chunks in this message, then finish
|
|
* assembling the Call message and return the number of bytes
|
|
* in the message.
|
|
*
|
|
* - If there are Read chunks in this message, post Read WRs to
|
|
* pull that payload and return 0.
|
|
*/
|
|
int svc_rdma_recvfrom(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_xprt *xprt = rqstp->rq_xprt;
|
|
struct svcxprt_rdma *rdma_xprt =
|
|
container_of(xprt, struct svcxprt_rdma, sc_xprt);
|
|
struct svc_rdma_op_ctxt *ctxt;
|
|
__be32 *p;
|
|
int ret;
|
|
|
|
spin_lock(&rdma_xprt->sc_rq_dto_lock);
|
|
if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
|
|
ctxt = list_first_entry(&rdma_xprt->sc_read_complete_q,
|
|
struct svc_rdma_op_ctxt, list);
|
|
list_del(&ctxt->list);
|
|
spin_unlock(&rdma_xprt->sc_rq_dto_lock);
|
|
rdma_read_complete(rqstp, ctxt);
|
|
goto complete;
|
|
} else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
|
|
ctxt = list_first_entry(&rdma_xprt->sc_rq_dto_q,
|
|
struct svc_rdma_op_ctxt, list);
|
|
list_del(&ctxt->list);
|
|
} else {
|
|
/* No new incoming requests, terminate the loop */
|
|
clear_bit(XPT_DATA, &xprt->xpt_flags);
|
|
spin_unlock(&rdma_xprt->sc_rq_dto_lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&rdma_xprt->sc_rq_dto_lock);
|
|
|
|
dprintk("svcrdma: recvfrom: ctxt=%p on xprt=%p, rqstp=%p\n",
|
|
ctxt, rdma_xprt, rqstp);
|
|
atomic_inc(&rdma_stat_recv);
|
|
|
|
svc_rdma_build_arg_xdr(rqstp, ctxt);
|
|
|
|
p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
|
|
ret = svc_rdma_xdr_decode_req(&rqstp->rq_arg);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
if (ret == 0)
|
|
goto out_drop;
|
|
rqstp->rq_xprt_hlen = ret;
|
|
|
|
if (svc_rdma_is_backchannel_reply(xprt, p)) {
|
|
ret = svc_rdma_handle_bc_reply(xprt->xpt_bc_xprt, p,
|
|
&rqstp->rq_arg);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
return ret;
|
|
}
|
|
|
|
p += rpcrdma_fixed_maxsz;
|
|
if (*p != xdr_zero)
|
|
goto out_readchunk;
|
|
|
|
complete:
|
|
svc_rdma_put_context(ctxt, 0);
|
|
dprintk("svcrdma: recvfrom: xprt=%p, rqstp=%p, rq_arg.len=%u\n",
|
|
rdma_xprt, rqstp, rqstp->rq_arg.len);
|
|
rqstp->rq_prot = IPPROTO_MAX;
|
|
svc_xprt_copy_addrs(rqstp, xprt);
|
|
return rqstp->rq_arg.len;
|
|
|
|
out_readchunk:
|
|
ret = svc_rdma_recv_read_chunk(rdma_xprt, rqstp, ctxt, p);
|
|
if (ret < 0)
|
|
goto out_postfail;
|
|
return 0;
|
|
|
|
out_err:
|
|
svc_rdma_send_error(rdma_xprt, p, ret);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
return 0;
|
|
|
|
out_postfail:
|
|
if (ret == -EINVAL)
|
|
svc_rdma_send_error(rdma_xprt, p, ret);
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return ret;
|
|
|
|
out_drop:
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return 0;
|
|
}
|