701 строка
19 KiB
C
701 строка
19 KiB
C
/*
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* Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
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* Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#include <linux/sunrpc/debug.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <linux/spinlock.h>
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#include <asm/unaligned.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <linux/sunrpc/svc_rdma.h>
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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/*
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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 rpcrdma_msg *rmsgp;
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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 =
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min_t(size_t, 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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/* RDMA_NOMSG: RDMA READ data should land just after RDMA RECV data */
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rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
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if (rmsgp->rm_type == rdma_nomsg)
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rqstp->rq_arg.pages = &rqstp->rq_pages[0];
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else
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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_t(u32, 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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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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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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/* Issue an RDMA_READ using the local lkey to map the data sink */
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int rdma_read_chunk_lcl(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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int *page_no,
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u32 *page_offset,
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u32 rs_handle,
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u32 rs_length,
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u64 rs_offset,
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bool last)
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{
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struct ib_rdma_wr read_wr;
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int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
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struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
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int ret, read, pno;
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u32 pg_off = *page_offset;
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u32 pg_no = *page_no;
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ctxt->direction = DMA_FROM_DEVICE;
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ctxt->read_hdr = head;
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pages_needed = min_t(int, pages_needed, xprt->sc_max_sge_rd);
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read = min_t(int, (pages_needed << PAGE_SHIFT) - *page_offset,
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rs_length);
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for (pno = 0; pno < pages_needed; pno++) {
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int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
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head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
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head->arg.page_len += len;
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head->arg.len += len;
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if (!pg_off)
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head->count++;
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rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
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rqstp->rq_next_page = rqstp->rq_respages + 1;
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ctxt->sge[pno].addr =
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ib_dma_map_page(xprt->sc_cm_id->device,
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head->arg.pages[pg_no], pg_off,
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PAGE_SIZE - pg_off,
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DMA_FROM_DEVICE);
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ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
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ctxt->sge[pno].addr);
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if (ret)
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goto err;
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svc_rdma_count_mappings(xprt, ctxt);
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ctxt->sge[pno].lkey = xprt->sc_pd->local_dma_lkey;
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ctxt->sge[pno].length = len;
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ctxt->count++;
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/* adjust offset and wrap to next page if needed */
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pg_off += len;
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if (pg_off == PAGE_SIZE) {
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pg_off = 0;
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pg_no++;
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}
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rs_length -= len;
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}
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if (last && rs_length == 0)
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set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
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else
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clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
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memset(&read_wr, 0, sizeof(read_wr));
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ctxt->cqe.done = svc_rdma_wc_read;
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read_wr.wr.wr_cqe = &ctxt->cqe;
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read_wr.wr.opcode = IB_WR_RDMA_READ;
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read_wr.wr.send_flags = IB_SEND_SIGNALED;
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read_wr.rkey = rs_handle;
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read_wr.remote_addr = rs_offset;
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read_wr.wr.sg_list = ctxt->sge;
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read_wr.wr.num_sge = pages_needed;
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ret = svc_rdma_send(xprt, &read_wr.wr);
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if (ret) {
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pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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goto err;
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}
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/* return current location in page array */
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*page_no = pg_no;
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*page_offset = pg_off;
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ret = read;
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atomic_inc(&rdma_stat_read);
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return ret;
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err:
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svc_rdma_unmap_dma(ctxt);
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svc_rdma_put_context(ctxt, 0);
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return ret;
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}
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/* Issue an RDMA_READ using an FRMR to map the data sink */
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int rdma_read_chunk_frmr(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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int *page_no,
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u32 *page_offset,
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u32 rs_handle,
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u32 rs_length,
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u64 rs_offset,
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bool last)
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{
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struct ib_rdma_wr read_wr;
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struct ib_send_wr inv_wr;
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struct ib_reg_wr reg_wr;
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u8 key;
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int nents = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
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struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
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struct svc_rdma_fastreg_mr *frmr = svc_rdma_get_frmr(xprt);
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int ret, read, pno, dma_nents, n;
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u32 pg_off = *page_offset;
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u32 pg_no = *page_no;
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if (IS_ERR(frmr))
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return -ENOMEM;
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ctxt->direction = DMA_FROM_DEVICE;
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ctxt->frmr = frmr;
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nents = min_t(unsigned int, nents, xprt->sc_frmr_pg_list_len);
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read = min_t(int, (nents << PAGE_SHIFT) - *page_offset, rs_length);
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frmr->direction = DMA_FROM_DEVICE;
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frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
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frmr->sg_nents = nents;
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for (pno = 0; pno < nents; pno++) {
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int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
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head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
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head->arg.page_len += len;
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head->arg.len += len;
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if (!pg_off)
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head->count++;
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sg_set_page(&frmr->sg[pno], rqstp->rq_arg.pages[pg_no],
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len, pg_off);
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rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
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rqstp->rq_next_page = rqstp->rq_respages + 1;
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/* adjust offset and wrap to next page if needed */
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pg_off += len;
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if (pg_off == PAGE_SIZE) {
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pg_off = 0;
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pg_no++;
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}
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rs_length -= len;
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}
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if (last && rs_length == 0)
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set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
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else
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clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
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dma_nents = ib_dma_map_sg(xprt->sc_cm_id->device,
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frmr->sg, frmr->sg_nents,
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frmr->direction);
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if (!dma_nents) {
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pr_err("svcrdma: failed to dma map sg %p\n",
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frmr->sg);
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return -ENOMEM;
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}
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n = ib_map_mr_sg(frmr->mr, frmr->sg, frmr->sg_nents, NULL, PAGE_SIZE);
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if (unlikely(n != frmr->sg_nents)) {
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pr_err("svcrdma: failed to map mr %p (%d/%d elements)\n",
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frmr->mr, n, frmr->sg_nents);
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return n < 0 ? n : -EINVAL;
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}
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/* Bump the key */
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key = (u8)(frmr->mr->lkey & 0x000000FF);
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ib_update_fast_reg_key(frmr->mr, ++key);
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ctxt->sge[0].addr = frmr->mr->iova;
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ctxt->sge[0].lkey = frmr->mr->lkey;
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ctxt->sge[0].length = frmr->mr->length;
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ctxt->count = 1;
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ctxt->read_hdr = head;
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/* Prepare REG WR */
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ctxt->reg_cqe.done = svc_rdma_wc_reg;
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reg_wr.wr.wr_cqe = &ctxt->reg_cqe;
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reg_wr.wr.opcode = IB_WR_REG_MR;
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reg_wr.wr.send_flags = IB_SEND_SIGNALED;
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reg_wr.wr.num_sge = 0;
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reg_wr.mr = frmr->mr;
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reg_wr.key = frmr->mr->lkey;
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reg_wr.access = frmr->access_flags;
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reg_wr.wr.next = &read_wr.wr;
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/* Prepare RDMA_READ */
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memset(&read_wr, 0, sizeof(read_wr));
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ctxt->cqe.done = svc_rdma_wc_read;
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read_wr.wr.wr_cqe = &ctxt->cqe;
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read_wr.wr.send_flags = IB_SEND_SIGNALED;
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read_wr.rkey = rs_handle;
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read_wr.remote_addr = rs_offset;
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read_wr.wr.sg_list = ctxt->sge;
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read_wr.wr.num_sge = 1;
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if (xprt->sc_dev_caps & SVCRDMA_DEVCAP_READ_W_INV) {
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read_wr.wr.opcode = IB_WR_RDMA_READ_WITH_INV;
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read_wr.wr.ex.invalidate_rkey = ctxt->frmr->mr->lkey;
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} else {
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read_wr.wr.opcode = IB_WR_RDMA_READ;
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read_wr.wr.next = &inv_wr;
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/* Prepare invalidate */
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memset(&inv_wr, 0, sizeof(inv_wr));
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ctxt->inv_cqe.done = svc_rdma_wc_inv;
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inv_wr.wr_cqe = &ctxt->inv_cqe;
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inv_wr.opcode = IB_WR_LOCAL_INV;
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inv_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_FENCE;
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inv_wr.ex.invalidate_rkey = frmr->mr->lkey;
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}
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/* Post the chain */
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ret = svc_rdma_send(xprt, ®_wr.wr);
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if (ret) {
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pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
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set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
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goto err;
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}
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/* return current location in page array */
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*page_no = pg_no;
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*page_offset = pg_off;
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ret = read;
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atomic_inc(&rdma_stat_read);
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return ret;
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err:
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svc_rdma_put_context(ctxt, 0);
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svc_rdma_put_frmr(xprt, frmr);
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return ret;
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}
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static unsigned int
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rdma_rcl_chunk_count(struct rpcrdma_read_chunk *ch)
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{
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unsigned int count;
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for (count = 0; ch->rc_discrim != xdr_zero; ch++)
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count++;
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return count;
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}
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/* If there was additional inline content, append it to the end of arg.pages.
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* Tail copy has to be done after the reader function has determined how many
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* pages are needed for RDMA READ.
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*/
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static int
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rdma_copy_tail(struct svc_rqst *rqstp, struct svc_rdma_op_ctxt *head,
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u32 position, u32 byte_count, u32 page_offset, int page_no)
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{
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char *srcp, *destp;
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srcp = head->arg.head[0].iov_base + position;
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byte_count = head->arg.head[0].iov_len - position;
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if (byte_count > PAGE_SIZE) {
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dprintk("svcrdma: large tail unsupported\n");
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return 0;
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}
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/* Fit as much of the tail on the current page as possible */
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if (page_offset != PAGE_SIZE) {
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destp = page_address(rqstp->rq_arg.pages[page_no]);
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destp += page_offset;
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while (byte_count--) {
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*destp++ = *srcp++;
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page_offset++;
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if (page_offset == PAGE_SIZE && byte_count)
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goto more;
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}
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goto done;
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}
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more:
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/* Fit the rest on the next page */
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page_no++;
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destp = page_address(rqstp->rq_arg.pages[page_no]);
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while (byte_count--)
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*destp++ = *srcp++;
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rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
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rqstp->rq_next_page = rqstp->rq_respages + 1;
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done:
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byte_count = head->arg.head[0].iov_len - position;
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head->arg.page_len += byte_count;
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head->arg.len += byte_count;
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head->arg.buflen += byte_count;
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return 1;
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}
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/* Returns the address of the first read chunk or <nul> if no read chunk
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* is present
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*/
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static struct rpcrdma_read_chunk *
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svc_rdma_get_read_chunk(struct rpcrdma_msg *rmsgp)
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{
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struct rpcrdma_read_chunk *ch =
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(struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
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if (ch->rc_discrim == xdr_zero)
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return NULL;
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return ch;
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}
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static int rdma_read_chunks(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 *head)
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{
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int page_no, ret;
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struct rpcrdma_read_chunk *ch;
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u32 handle, page_offset, byte_count;
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u32 position;
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u64 rs_offset;
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bool last;
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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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if (rdma_rcl_chunk_count(ch) > RPCSVC_MAXPAGES)
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return -EINVAL;
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/* The request is completed when the RDMA_READs complete. The
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* head context keeps all the pages that comprise the
|
|
* request.
|
|
*/
|
|
head->arg.head[0] = rqstp->rq_arg.head[0];
|
|
head->arg.tail[0] = rqstp->rq_arg.tail[0];
|
|
head->hdr_count = head->count;
|
|
head->arg.page_base = 0;
|
|
head->arg.page_len = 0;
|
|
head->arg.len = rqstp->rq_arg.len;
|
|
head->arg.buflen = rqstp->rq_arg.buflen;
|
|
|
|
/* RDMA_NOMSG: RDMA READ data should land just after RDMA RECV data */
|
|
position = be32_to_cpu(ch->rc_position);
|
|
if (position == 0) {
|
|
head->arg.pages = &head->pages[0];
|
|
page_offset = head->byte_len;
|
|
} else {
|
|
head->arg.pages = &head->pages[head->count];
|
|
page_offset = 0;
|
|
}
|
|
|
|
ret = 0;
|
|
page_no = 0;
|
|
for (; ch->rc_discrim != xdr_zero; ch++) {
|
|
if (be32_to_cpu(ch->rc_position) != position)
|
|
goto err;
|
|
|
|
handle = be32_to_cpu(ch->rc_target.rs_handle),
|
|
byte_count = be32_to_cpu(ch->rc_target.rs_length);
|
|
xdr_decode_hyper((__be32 *)&ch->rc_target.rs_offset,
|
|
&rs_offset);
|
|
|
|
while (byte_count > 0) {
|
|
last = (ch + 1)->rc_discrim == xdr_zero;
|
|
ret = xprt->sc_reader(xprt, rqstp, head,
|
|
&page_no, &page_offset,
|
|
handle, byte_count,
|
|
rs_offset, last);
|
|
if (ret < 0)
|
|
goto err;
|
|
byte_count -= ret;
|
|
rs_offset += ret;
|
|
head->arg.buflen += ret;
|
|
}
|
|
}
|
|
|
|
/* Read list may need XDR round-up (see RFC 5666, s. 3.7) */
|
|
if (page_offset & 3) {
|
|
u32 pad = 4 - (page_offset & 3);
|
|
|
|
head->arg.tail[0].iov_len += pad;
|
|
head->arg.len += pad;
|
|
head->arg.buflen += pad;
|
|
page_offset += pad;
|
|
}
|
|
|
|
ret = 1;
|
|
if (position && position < head->arg.head[0].iov_len)
|
|
ret = rdma_copy_tail(rqstp, head, position,
|
|
byte_count, page_offset, page_no);
|
|
head->arg.head[0].iov_len = position;
|
|
head->position = position;
|
|
|
|
err:
|
|
/* Detach arg pages. svc_recv will replenish them */
|
|
for (page_no = 0;
|
|
&rqstp->rq_pages[page_no] < rqstp->rq_respages; page_no++)
|
|
rqstp->rq_pages[page_no] = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rdma_read_complete(struct svc_rqst *rqstp,
|
|
struct svc_rdma_op_ctxt *head)
|
|
{
|
|
int page_no;
|
|
|
|
/* Copy RPC pages */
|
|
for (page_no = 0; page_no < head->count; page_no++) {
|
|
put_page(rqstp->rq_pages[page_no]);
|
|
rqstp->rq_pages[page_no] = head->pages[page_no];
|
|
}
|
|
|
|
/* Adjustments made for RDMA_NOMSG type requests */
|
|
if (head->position == 0) {
|
|
if (head->arg.len <= head->sge[0].length) {
|
|
head->arg.head[0].iov_len = head->arg.len -
|
|
head->byte_len;
|
|
head->arg.page_len = 0;
|
|
} else {
|
|
head->arg.head[0].iov_len = head->sge[0].length -
|
|
head->byte_len;
|
|
head->arg.page_len = head->arg.len -
|
|
head->sge[0].length;
|
|
}
|
|
}
|
|
|
|
/* Point rq_arg.pages past header */
|
|
rqstp->rq_arg.pages = &rqstp->rq_pages[head->hdr_count];
|
|
rqstp->rq_arg.page_len = head->arg.page_len;
|
|
rqstp->rq_arg.page_base = head->arg.page_base;
|
|
|
|
/* rq_respages starts after the last arg page */
|
|
rqstp->rq_respages = &rqstp->rq_pages[page_no];
|
|
rqstp->rq_next_page = rqstp->rq_respages + 1;
|
|
|
|
/* Rebuild rq_arg head and tail. */
|
|
rqstp->rq_arg.head[0] = head->arg.head[0];
|
|
rqstp->rq_arg.tail[0] = head->arg.tail[0];
|
|
rqstp->rq_arg.len = head->arg.len;
|
|
rqstp->rq_arg.buflen = head->arg.buflen;
|
|
}
|
|
|
|
/* 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
|
|
svc_rdma_is_backchannel_reply(struct svc_xprt *xprt, struct rpcrdma_msg *rmsgp)
|
|
{
|
|
__be32 *p = (__be32 *)rmsgp;
|
|
|
|
if (!xprt->xpt_bc_xprt)
|
|
return false;
|
|
|
|
if (rmsgp->rm_type != rdma_msg)
|
|
return false;
|
|
if (rmsgp->rm_body.rm_chunks[0] != xdr_zero)
|
|
return false;
|
|
if (rmsgp->rm_body.rm_chunks[1] != xdr_zero)
|
|
return false;
|
|
if (rmsgp->rm_body.rm_chunks[2] != xdr_zero)
|
|
return false;
|
|
|
|
/* sanity */
|
|
if (p[7] != rmsgp->rm_xid)
|
|
return false;
|
|
/* call direction */
|
|
if (p[8] == cpu_to_be32(RPC_CALL))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Set up the rqstp thread context to point to the RQ buffer. If
|
|
* necessary, pull additional data from the client with an RDMA_READ
|
|
* request.
|
|
*/
|
|
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 = NULL;
|
|
struct rpcrdma_msg *rmsgp;
|
|
int ret = 0;
|
|
|
|
dprintk("svcrdma: rqstp=%p\n", rqstp);
|
|
|
|
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 {
|
|
atomic_inc(&rdma_stat_rq_starve);
|
|
clear_bit(XPT_DATA, &xprt->xpt_flags);
|
|
ctxt = NULL;
|
|
}
|
|
spin_unlock(&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 defer;
|
|
goto out;
|
|
}
|
|
dprintk("svcrdma: processing ctxt=%p on xprt=%p, rqstp=%p\n",
|
|
ctxt, rdma_xprt, rqstp);
|
|
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. */
|
|
rmsgp = (struct rpcrdma_msg *)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, rmsgp)) {
|
|
ret = svc_rdma_handle_bc_reply(xprt->xpt_bc_xprt, rmsgp,
|
|
&rqstp->rq_arg);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
if (ret)
|
|
goto repost;
|
|
return ret;
|
|
}
|
|
|
|
/* Read read-list data. */
|
|
ret = rdma_read_chunks(rdma_xprt, rmsgp, rqstp, ctxt);
|
|
if (ret > 0) {
|
|
/* read-list posted, defer until data received from client. */
|
|
goto defer;
|
|
} else if (ret < 0) {
|
|
/* Post of read-list failed, free context. */
|
|
svc_rdma_put_context(ctxt, 1);
|
|
return 0;
|
|
}
|
|
|
|
complete:
|
|
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=%u, "
|
|
"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);
|
|
return ret;
|
|
|
|
out_err:
|
|
svc_rdma_send_error(rdma_xprt, rmsgp, ret);
|
|
svc_rdma_put_context(ctxt, 0);
|
|
return 0;
|
|
|
|
defer:
|
|
return 0;
|
|
|
|
out_drop:
|
|
svc_rdma_put_context(ctxt, 1);
|
|
repost:
|
|
return svc_rdma_repost_recv(rdma_xprt, GFP_KERNEL);
|
|
}
|