![Chuck Lever](/assets/img/avatar_default.png)
Michal Kalderon has found some corner cases around device unload
with active NFS mounts that I didn't have the imagination to test
when xprtrdma device removal was added last year.
- The ULP device removal handler is responsible for deallocating
the PD. That wasn't clear to me initially, and my own testing
suggested it was not necessary, but that is incorrect.
- The transport destruction path can no longer assume that there
is a valid ID.
- When destroying a transport, ensure that ib_free_cq() is not
invoked on a CQ that was already released.
Reported-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Fixes: bebd031866
("xprtrdma: Support unplugging an HCA from ...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
1636 lines
40 KiB
C
1636 lines
40 KiB
C
/*
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* Copyright (c) 2014-2017 Oracle. All rights reserved.
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the BSD-type
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* license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Network Appliance, Inc. nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* verbs.c
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*
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* Encapsulates the major functions managing:
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* o adapters
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* o endpoints
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* o connections
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* o buffer memory
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*/
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/svc_rdma.h>
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#include <asm-generic/barrier.h>
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#include <asm/bitops.h>
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#include <rdma/ib_cm.h>
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#include "xprt_rdma.h"
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/*
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* Globals/Macros
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*/
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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/*
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* internal functions
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*/
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static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
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static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf);
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static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb);
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struct workqueue_struct *rpcrdma_receive_wq __read_mostly;
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int
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rpcrdma_alloc_wq(void)
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{
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struct workqueue_struct *recv_wq;
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recv_wq = alloc_workqueue("xprtrdma_receive",
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WQ_MEM_RECLAIM | WQ_HIGHPRI,
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0);
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if (!recv_wq)
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return -ENOMEM;
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rpcrdma_receive_wq = recv_wq;
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return 0;
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}
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void
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rpcrdma_destroy_wq(void)
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{
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struct workqueue_struct *wq;
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if (rpcrdma_receive_wq) {
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wq = rpcrdma_receive_wq;
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rpcrdma_receive_wq = NULL;
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destroy_workqueue(wq);
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}
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}
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static void
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rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
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{
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struct rpcrdma_ep *ep = context;
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struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt,
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rx_ep);
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trace_xprtrdma_qp_error(r_xprt, event);
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pr_err("rpcrdma: %s on device %s ep %p\n",
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ib_event_msg(event->event), event->device->name, context);
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if (ep->rep_connected == 1) {
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ep->rep_connected = -EIO;
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rpcrdma_conn_func(ep);
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wake_up_all(&ep->rep_connect_wait);
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}
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}
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/**
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* rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_cqe *cqe = wc->wr_cqe;
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struct rpcrdma_sendctx *sc =
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container_of(cqe, struct rpcrdma_sendctx, sc_cqe);
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/* WARNING: Only wr_cqe and status are reliable at this point */
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trace_xprtrdma_wc_send(sc, wc);
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if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: Send: %s (%u/0x%x)\n",
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ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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rpcrdma_sendctx_put_locked(sc);
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}
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/**
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* rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_cqe *cqe = wc->wr_cqe;
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struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
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rr_cqe);
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/* WARNING: Only wr_id and status are reliable at this point */
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trace_xprtrdma_wc_receive(rep, wc);
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if (wc->status != IB_WC_SUCCESS)
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goto out_fail;
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/* status == SUCCESS means all fields in wc are trustworthy */
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rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len);
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rep->rr_wc_flags = wc->wc_flags;
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rep->rr_inv_rkey = wc->ex.invalidate_rkey;
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ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf),
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rdmab_addr(rep->rr_rdmabuf),
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wc->byte_len, DMA_FROM_DEVICE);
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out_schedule:
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rpcrdma_reply_handler(rep);
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return;
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out_fail:
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if (wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: Recv: %s (%u/0x%x)\n",
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ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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rpcrdma_set_xdrlen(&rep->rr_hdrbuf, 0);
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goto out_schedule;
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}
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static void
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rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
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struct rdma_conn_param *param)
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{
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struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
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const struct rpcrdma_connect_private *pmsg = param->private_data;
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unsigned int rsize, wsize;
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/* Default settings for RPC-over-RDMA Version One */
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r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize;
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rsize = RPCRDMA_V1_DEF_INLINE_SIZE;
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wsize = RPCRDMA_V1_DEF_INLINE_SIZE;
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if (pmsg &&
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pmsg->cp_magic == rpcrdma_cmp_magic &&
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pmsg->cp_version == RPCRDMA_CMP_VERSION) {
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r_xprt->rx_ia.ri_implicit_roundup = true;
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rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size);
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wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
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}
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if (rsize < cdata->inline_rsize)
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cdata->inline_rsize = rsize;
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if (wsize < cdata->inline_wsize)
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cdata->inline_wsize = wsize;
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dprintk("RPC: %s: max send %u, max recv %u\n",
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__func__, cdata->inline_wsize, cdata->inline_rsize);
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rpcrdma_set_max_header_sizes(r_xprt);
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}
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static int
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rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
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{
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struct rpcrdma_xprt *xprt = id->context;
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struct rpcrdma_ia *ia = &xprt->rx_ia;
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struct rpcrdma_ep *ep = &xprt->rx_ep;
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int connstate = 0;
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trace_xprtrdma_conn_upcall(xprt, event);
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switch (event->event) {
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case RDMA_CM_EVENT_ADDR_RESOLVED:
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case RDMA_CM_EVENT_ROUTE_RESOLVED:
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ia->ri_async_rc = 0;
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complete(&ia->ri_done);
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break;
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case RDMA_CM_EVENT_ADDR_ERROR:
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ia->ri_async_rc = -EHOSTUNREACH;
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complete(&ia->ri_done);
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break;
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case RDMA_CM_EVENT_ROUTE_ERROR:
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ia->ri_async_rc = -ENETUNREACH;
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complete(&ia->ri_done);
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break;
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case RDMA_CM_EVENT_DEVICE_REMOVAL:
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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pr_info("rpcrdma: removing device %s for %s:%s\n",
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ia->ri_device->name,
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rpcrdma_addrstr(xprt), rpcrdma_portstr(xprt));
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#endif
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set_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags);
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ep->rep_connected = -ENODEV;
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xprt_force_disconnect(&xprt->rx_xprt);
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wait_for_completion(&ia->ri_remove_done);
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ia->ri_id = NULL;
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ia->ri_device = NULL;
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/* Return 1 to ensure the core destroys the id. */
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return 1;
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case RDMA_CM_EVENT_ESTABLISHED:
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++xprt->rx_xprt.connect_cookie;
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connstate = 1;
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rpcrdma_update_connect_private(xprt, &event->param.conn);
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goto connected;
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case RDMA_CM_EVENT_CONNECT_ERROR:
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connstate = -ENOTCONN;
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goto connected;
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case RDMA_CM_EVENT_UNREACHABLE:
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connstate = -ENETDOWN;
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goto connected;
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case RDMA_CM_EVENT_REJECTED:
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dprintk("rpcrdma: connection to %s:%s rejected: %s\n",
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rpcrdma_addrstr(xprt), rpcrdma_portstr(xprt),
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rdma_reject_msg(id, event->status));
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connstate = -ECONNREFUSED;
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if (event->status == IB_CM_REJ_STALE_CONN)
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connstate = -EAGAIN;
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goto connected;
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case RDMA_CM_EVENT_DISCONNECTED:
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++xprt->rx_xprt.connect_cookie;
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connstate = -ECONNABORTED;
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connected:
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xprt->rx_buf.rb_credits = 1;
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ep->rep_connected = connstate;
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rpcrdma_conn_func(ep);
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wake_up_all(&ep->rep_connect_wait);
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/*FALLTHROUGH*/
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default:
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dprintk("RPC: %s: %s:%s on %s/%s (ep 0x%p): %s\n",
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__func__,
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rpcrdma_addrstr(xprt), rpcrdma_portstr(xprt),
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ia->ri_device->name, ia->ri_ops->ro_displayname,
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ep, rdma_event_msg(event->event));
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break;
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}
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return 0;
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}
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static struct rdma_cm_id *
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rpcrdma_create_id(struct rpcrdma_xprt *xprt, struct rpcrdma_ia *ia)
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{
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unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1;
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struct rdma_cm_id *id;
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int rc;
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trace_xprtrdma_conn_start(xprt);
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init_completion(&ia->ri_done);
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init_completion(&ia->ri_remove_done);
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id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP,
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IB_QPT_RC);
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if (IS_ERR(id)) {
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rc = PTR_ERR(id);
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dprintk("RPC: %s: rdma_create_id() failed %i\n",
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__func__, rc);
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return id;
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}
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ia->ri_async_rc = -ETIMEDOUT;
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rc = rdma_resolve_addr(id, NULL,
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(struct sockaddr *)&xprt->rx_xprt.addr,
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RDMA_RESOLVE_TIMEOUT);
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if (rc) {
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dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
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__func__, rc);
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goto out;
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}
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rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout);
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if (rc < 0) {
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trace_xprtrdma_conn_tout(xprt);
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goto out;
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}
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rc = ia->ri_async_rc;
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if (rc)
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goto out;
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ia->ri_async_rc = -ETIMEDOUT;
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rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
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if (rc) {
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dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
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__func__, rc);
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goto out;
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}
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rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout);
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if (rc < 0) {
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trace_xprtrdma_conn_tout(xprt);
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goto out;
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}
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rc = ia->ri_async_rc;
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if (rc)
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goto out;
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return id;
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out:
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rdma_destroy_id(id);
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return ERR_PTR(rc);
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}
|
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|
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/*
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* Exported functions.
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*/
|
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|
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/**
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* rpcrdma_ia_open - Open and initialize an Interface Adapter.
|
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* @xprt: transport with IA to (re)initialize
|
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*
|
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* Returns 0 on success, negative errno if an appropriate
|
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* Interface Adapter could not be found and opened.
|
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*/
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int
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rpcrdma_ia_open(struct rpcrdma_xprt *xprt)
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{
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struct rpcrdma_ia *ia = &xprt->rx_ia;
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int rc;
|
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|
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ia->ri_id = rpcrdma_create_id(xprt, ia);
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if (IS_ERR(ia->ri_id)) {
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rc = PTR_ERR(ia->ri_id);
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goto out_err;
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}
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ia->ri_device = ia->ri_id->device;
|
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|
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ia->ri_pd = ib_alloc_pd(ia->ri_device, 0);
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if (IS_ERR(ia->ri_pd)) {
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rc = PTR_ERR(ia->ri_pd);
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pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc);
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goto out_err;
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}
|
|
|
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switch (xprt_rdma_memreg_strategy) {
|
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case RPCRDMA_FRWR:
|
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if (frwr_is_supported(ia)) {
|
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ia->ri_ops = &rpcrdma_frwr_memreg_ops;
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break;
|
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}
|
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/*FALLTHROUGH*/
|
|
case RPCRDMA_MTHCAFMR:
|
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if (fmr_is_supported(ia)) {
|
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ia->ri_ops = &rpcrdma_fmr_memreg_ops;
|
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break;
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}
|
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/*FALLTHROUGH*/
|
|
default:
|
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pr_err("rpcrdma: Device %s does not support memreg mode %d\n",
|
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ia->ri_device->name, xprt_rdma_memreg_strategy);
|
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rc = -EINVAL;
|
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goto out_err;
|
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}
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
rpcrdma_ia_close(ia);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_ia_remove - Handle device driver unload
|
|
* @ia: interface adapter being removed
|
|
*
|
|
* Divest transport H/W resources associated with this adapter,
|
|
* but allow it to be restored later.
|
|
*/
|
|
void
|
|
rpcrdma_ia_remove(struct rpcrdma_ia *ia)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
|
|
rx_ia);
|
|
struct rpcrdma_ep *ep = &r_xprt->rx_ep;
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_req *req;
|
|
struct rpcrdma_rep *rep;
|
|
|
|
cancel_delayed_work_sync(&buf->rb_refresh_worker);
|
|
|
|
/* This is similar to rpcrdma_ep_destroy, but:
|
|
* - Don't cancel the connect worker.
|
|
* - Don't call rpcrdma_ep_disconnect, which waits
|
|
* for another conn upcall, which will deadlock.
|
|
* - rdma_disconnect is unneeded, the underlying
|
|
* connection is already gone.
|
|
*/
|
|
if (ia->ri_id->qp) {
|
|
ib_drain_qp(ia->ri_id->qp);
|
|
rdma_destroy_qp(ia->ri_id);
|
|
ia->ri_id->qp = NULL;
|
|
}
|
|
ib_free_cq(ep->rep_attr.recv_cq);
|
|
ep->rep_attr.recv_cq = NULL;
|
|
ib_free_cq(ep->rep_attr.send_cq);
|
|
ep->rep_attr.send_cq = NULL;
|
|
|
|
/* The ULP is responsible for ensuring all DMA
|
|
* mappings and MRs are gone.
|
|
*/
|
|
list_for_each_entry(rep, &buf->rb_recv_bufs, rr_list)
|
|
rpcrdma_dma_unmap_regbuf(rep->rr_rdmabuf);
|
|
list_for_each_entry(req, &buf->rb_allreqs, rl_all) {
|
|
rpcrdma_dma_unmap_regbuf(req->rl_rdmabuf);
|
|
rpcrdma_dma_unmap_regbuf(req->rl_sendbuf);
|
|
rpcrdma_dma_unmap_regbuf(req->rl_recvbuf);
|
|
}
|
|
rpcrdma_mrs_destroy(buf);
|
|
ib_dealloc_pd(ia->ri_pd);
|
|
ia->ri_pd = NULL;
|
|
|
|
/* Allow waiters to continue */
|
|
complete(&ia->ri_remove_done);
|
|
|
|
trace_xprtrdma_remove(r_xprt);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_ia_close - Clean up/close an IA.
|
|
* @ia: interface adapter to close
|
|
*
|
|
*/
|
|
void
|
|
rpcrdma_ia_close(struct rpcrdma_ia *ia)
|
|
{
|
|
if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
|
|
if (ia->ri_id->qp)
|
|
rdma_destroy_qp(ia->ri_id);
|
|
rdma_destroy_id(ia->ri_id);
|
|
}
|
|
ia->ri_id = NULL;
|
|
ia->ri_device = NULL;
|
|
|
|
/* If the pd is still busy, xprtrdma missed freeing a resource */
|
|
if (ia->ri_pd && !IS_ERR(ia->ri_pd))
|
|
ib_dealloc_pd(ia->ri_pd);
|
|
ia->ri_pd = NULL;
|
|
}
|
|
|
|
/*
|
|
* Create unconnected endpoint.
|
|
*/
|
|
int
|
|
rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
|
|
struct rpcrdma_create_data_internal *cdata)
|
|
{
|
|
struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private;
|
|
unsigned int max_qp_wr, max_sge;
|
|
struct ib_cq *sendcq, *recvcq;
|
|
int rc;
|
|
|
|
max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge,
|
|
RPCRDMA_MAX_SEND_SGES);
|
|
if (max_sge < RPCRDMA_MIN_SEND_SGES) {
|
|
pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge);
|
|
return -ENOMEM;
|
|
}
|
|
ia->ri_max_send_sges = max_sge;
|
|
|
|
if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
|
|
dprintk("RPC: %s: insufficient wqe's available\n",
|
|
__func__);
|
|
return -ENOMEM;
|
|
}
|
|
max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
|
|
|
|
/* check provider's send/recv wr limits */
|
|
if (cdata->max_requests > max_qp_wr)
|
|
cdata->max_requests = max_qp_wr;
|
|
|
|
ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
|
|
ep->rep_attr.qp_context = ep;
|
|
ep->rep_attr.srq = NULL;
|
|
ep->rep_attr.cap.max_send_wr = cdata->max_requests;
|
|
ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
|
|
ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */
|
|
rc = ia->ri_ops->ro_open(ia, ep, cdata);
|
|
if (rc)
|
|
return rc;
|
|
ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
|
|
ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
|
|
ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */
|
|
ep->rep_attr.cap.max_send_sge = max_sge;
|
|
ep->rep_attr.cap.max_recv_sge = 1;
|
|
ep->rep_attr.cap.max_inline_data = 0;
|
|
ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
ep->rep_attr.qp_type = IB_QPT_RC;
|
|
ep->rep_attr.port_num = ~0;
|
|
|
|
dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
|
|
"iovs: send %d recv %d\n",
|
|
__func__,
|
|
ep->rep_attr.cap.max_send_wr,
|
|
ep->rep_attr.cap.max_recv_wr,
|
|
ep->rep_attr.cap.max_send_sge,
|
|
ep->rep_attr.cap.max_recv_sge);
|
|
|
|
/* set trigger for requesting send completion */
|
|
ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH,
|
|
cdata->max_requests >> 2);
|
|
ep->rep_send_count = ep->rep_send_batch;
|
|
init_waitqueue_head(&ep->rep_connect_wait);
|
|
INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
|
|
|
|
sendcq = ib_alloc_cq(ia->ri_device, NULL,
|
|
ep->rep_attr.cap.max_send_wr + 1,
|
|
1, IB_POLL_WORKQUEUE);
|
|
if (IS_ERR(sendcq)) {
|
|
rc = PTR_ERR(sendcq);
|
|
dprintk("RPC: %s: failed to create send CQ: %i\n",
|
|
__func__, rc);
|
|
goto out1;
|
|
}
|
|
|
|
recvcq = ib_alloc_cq(ia->ri_device, NULL,
|
|
ep->rep_attr.cap.max_recv_wr + 1,
|
|
0, IB_POLL_WORKQUEUE);
|
|
if (IS_ERR(recvcq)) {
|
|
rc = PTR_ERR(recvcq);
|
|
dprintk("RPC: %s: failed to create recv CQ: %i\n",
|
|
__func__, rc);
|
|
goto out2;
|
|
}
|
|
|
|
ep->rep_attr.send_cq = sendcq;
|
|
ep->rep_attr.recv_cq = recvcq;
|
|
|
|
/* Initialize cma parameters */
|
|
memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma));
|
|
|
|
/* Prepare RDMA-CM private message */
|
|
pmsg->cp_magic = rpcrdma_cmp_magic;
|
|
pmsg->cp_version = RPCRDMA_CMP_VERSION;
|
|
pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok;
|
|
pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize);
|
|
pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize);
|
|
ep->rep_remote_cma.private_data = pmsg;
|
|
ep->rep_remote_cma.private_data_len = sizeof(*pmsg);
|
|
|
|
/* Client offers RDMA Read but does not initiate */
|
|
ep->rep_remote_cma.initiator_depth = 0;
|
|
ep->rep_remote_cma.responder_resources =
|
|
min_t(int, U8_MAX, ia->ri_device->attrs.max_qp_rd_atom);
|
|
|
|
/* Limit transport retries so client can detect server
|
|
* GID changes quickly. RPC layer handles re-establishing
|
|
* transport connection and retransmission.
|
|
*/
|
|
ep->rep_remote_cma.retry_count = 6;
|
|
|
|
/* RPC-over-RDMA handles its own flow control. In addition,
|
|
* make all RNR NAKs visible so we know that RPC-over-RDMA
|
|
* flow control is working correctly (no NAKs should be seen).
|
|
*/
|
|
ep->rep_remote_cma.flow_control = 0;
|
|
ep->rep_remote_cma.rnr_retry_count = 0;
|
|
|
|
return 0;
|
|
|
|
out2:
|
|
ib_free_cq(sendcq);
|
|
out1:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* rpcrdma_ep_destroy
|
|
*
|
|
* Disconnect and destroy endpoint. After this, the only
|
|
* valid operations on the ep are to free it (if dynamically
|
|
* allocated) or re-create it.
|
|
*/
|
|
void
|
|
rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
cancel_delayed_work_sync(&ep->rep_connect_worker);
|
|
|
|
if (ia->ri_id && ia->ri_id->qp) {
|
|
rpcrdma_ep_disconnect(ep, ia);
|
|
rdma_destroy_qp(ia->ri_id);
|
|
ia->ri_id->qp = NULL;
|
|
}
|
|
|
|
if (ep->rep_attr.recv_cq)
|
|
ib_free_cq(ep->rep_attr.recv_cq);
|
|
if (ep->rep_attr.send_cq)
|
|
ib_free_cq(ep->rep_attr.send_cq);
|
|
}
|
|
|
|
/* Re-establish a connection after a device removal event.
|
|
* Unlike a normal reconnection, a fresh PD and a new set
|
|
* of MRs and buffers is needed.
|
|
*/
|
|
static int
|
|
rpcrdma_ep_recreate_xprt(struct rpcrdma_xprt *r_xprt,
|
|
struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
int rc, err;
|
|
|
|
trace_xprtrdma_reinsert(r_xprt);
|
|
|
|
rc = -EHOSTUNREACH;
|
|
if (rpcrdma_ia_open(r_xprt))
|
|
goto out1;
|
|
|
|
rc = -ENOMEM;
|
|
err = rpcrdma_ep_create(ep, ia, &r_xprt->rx_data);
|
|
if (err) {
|
|
pr_err("rpcrdma: rpcrdma_ep_create returned %d\n", err);
|
|
goto out2;
|
|
}
|
|
|
|
rc = -ENETUNREACH;
|
|
err = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
|
|
if (err) {
|
|
pr_err("rpcrdma: rdma_create_qp returned %d\n", err);
|
|
goto out3;
|
|
}
|
|
|
|
rpcrdma_mrs_create(r_xprt);
|
|
return 0;
|
|
|
|
out3:
|
|
rpcrdma_ep_destroy(ep, ia);
|
|
out2:
|
|
rpcrdma_ia_close(ia);
|
|
out1:
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep,
|
|
struct rpcrdma_ia *ia)
|
|
{
|
|
struct rdma_cm_id *id, *old;
|
|
int err, rc;
|
|
|
|
trace_xprtrdma_reconnect(r_xprt);
|
|
|
|
rpcrdma_ep_disconnect(ep, ia);
|
|
|
|
rc = -EHOSTUNREACH;
|
|
id = rpcrdma_create_id(r_xprt, ia);
|
|
if (IS_ERR(id))
|
|
goto out;
|
|
|
|
/* As long as the new ID points to the same device as the
|
|
* old ID, we can reuse the transport's existing PD and all
|
|
* previously allocated MRs. Also, the same device means
|
|
* the transport's previous DMA mappings are still valid.
|
|
*
|
|
* This is a sanity check only. There should be no way these
|
|
* point to two different devices here.
|
|
*/
|
|
old = id;
|
|
rc = -ENETUNREACH;
|
|
if (ia->ri_device != id->device) {
|
|
pr_err("rpcrdma: can't reconnect on different device!\n");
|
|
goto out_destroy;
|
|
}
|
|
|
|
err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
|
|
if (err) {
|
|
dprintk("RPC: %s: rdma_create_qp returned %d\n",
|
|
__func__, err);
|
|
goto out_destroy;
|
|
}
|
|
|
|
/* Atomically replace the transport's ID and QP. */
|
|
rc = 0;
|
|
old = ia->ri_id;
|
|
ia->ri_id = id;
|
|
rdma_destroy_qp(old);
|
|
|
|
out_destroy:
|
|
rdma_destroy_id(old);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Connect unconnected endpoint.
|
|
*/
|
|
int
|
|
rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
|
|
rx_ia);
|
|
unsigned int extras;
|
|
int rc;
|
|
|
|
retry:
|
|
switch (ep->rep_connected) {
|
|
case 0:
|
|
dprintk("RPC: %s: connecting...\n", __func__);
|
|
rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
|
|
if (rc) {
|
|
dprintk("RPC: %s: rdma_create_qp failed %i\n",
|
|
__func__, rc);
|
|
rc = -ENETUNREACH;
|
|
goto out_noupdate;
|
|
}
|
|
break;
|
|
case -ENODEV:
|
|
rc = rpcrdma_ep_recreate_xprt(r_xprt, ep, ia);
|
|
if (rc)
|
|
goto out_noupdate;
|
|
break;
|
|
default:
|
|
rc = rpcrdma_ep_reconnect(r_xprt, ep, ia);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
ep->rep_connected = 0;
|
|
|
|
rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
|
|
if (rc) {
|
|
dprintk("RPC: %s: rdma_connect() failed with %i\n",
|
|
__func__, rc);
|
|
goto out;
|
|
}
|
|
|
|
wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
|
|
if (ep->rep_connected <= 0) {
|
|
if (ep->rep_connected == -EAGAIN)
|
|
goto retry;
|
|
rc = ep->rep_connected;
|
|
goto out;
|
|
}
|
|
|
|
dprintk("RPC: %s: connected\n", __func__);
|
|
extras = r_xprt->rx_buf.rb_bc_srv_max_requests;
|
|
if (extras)
|
|
rpcrdma_ep_post_extra_recv(r_xprt, extras);
|
|
|
|
out:
|
|
if (rc)
|
|
ep->rep_connected = rc;
|
|
|
|
out_noupdate:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* rpcrdma_ep_disconnect
|
|
*
|
|
* This is separate from destroy to facilitate the ability
|
|
* to reconnect without recreating the endpoint.
|
|
*
|
|
* This call is not reentrant, and must not be made in parallel
|
|
* on the same endpoint.
|
|
*/
|
|
void
|
|
rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
|
|
{
|
|
int rc;
|
|
|
|
rc = rdma_disconnect(ia->ri_id);
|
|
if (!rc)
|
|
/* returns without wait if not connected */
|
|
wait_event_interruptible(ep->rep_connect_wait,
|
|
ep->rep_connected != 1);
|
|
else
|
|
ep->rep_connected = rc;
|
|
trace_xprtrdma_disconnect(container_of(ep, struct rpcrdma_xprt,
|
|
rx_ep), rc);
|
|
|
|
ib_drain_qp(ia->ri_id->qp);
|
|
}
|
|
|
|
/* Fixed-size circular FIFO queue. This implementation is wait-free and
|
|
* lock-free.
|
|
*
|
|
* Consumer is the code path that posts Sends. This path dequeues a
|
|
* sendctx for use by a Send operation. Multiple consumer threads
|
|
* are serialized by the RPC transport lock, which allows only one
|
|
* ->send_request call at a time.
|
|
*
|
|
* Producer is the code path that handles Send completions. This path
|
|
* enqueues a sendctx that has been completed. Multiple producer
|
|
* threads are serialized by the ib_poll_cq() function.
|
|
*/
|
|
|
|
/* rpcrdma_sendctxs_destroy() assumes caller has already quiesced
|
|
* queue activity, and ib_drain_qp has flushed all remaining Send
|
|
* requests.
|
|
*/
|
|
static void rpcrdma_sendctxs_destroy(struct rpcrdma_buffer *buf)
|
|
{
|
|
unsigned long i;
|
|
|
|
for (i = 0; i <= buf->rb_sc_last; i++)
|
|
kfree(buf->rb_sc_ctxs[i]);
|
|
kfree(buf->rb_sc_ctxs);
|
|
}
|
|
|
|
static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ia *ia)
|
|
{
|
|
struct rpcrdma_sendctx *sc;
|
|
|
|
sc = kzalloc(sizeof(*sc) +
|
|
ia->ri_max_send_sges * sizeof(struct ib_sge),
|
|
GFP_KERNEL);
|
|
if (!sc)
|
|
return NULL;
|
|
|
|
sc->sc_wr.wr_cqe = &sc->sc_cqe;
|
|
sc->sc_wr.sg_list = sc->sc_sges;
|
|
sc->sc_wr.opcode = IB_WR_SEND;
|
|
sc->sc_cqe.done = rpcrdma_wc_send;
|
|
return sc;
|
|
}
|
|
|
|
static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_sendctx *sc;
|
|
unsigned long i;
|
|
|
|
/* Maximum number of concurrent outstanding Send WRs. Capping
|
|
* the circular queue size stops Send Queue overflow by causing
|
|
* the ->send_request call to fail temporarily before too many
|
|
* Sends are posted.
|
|
*/
|
|
i = buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS;
|
|
dprintk("RPC: %s: allocating %lu send_ctxs\n", __func__, i);
|
|
buf->rb_sc_ctxs = kcalloc(i, sizeof(sc), GFP_KERNEL);
|
|
if (!buf->rb_sc_ctxs)
|
|
return -ENOMEM;
|
|
|
|
buf->rb_sc_last = i - 1;
|
|
for (i = 0; i <= buf->rb_sc_last; i++) {
|
|
sc = rpcrdma_sendctx_create(&r_xprt->rx_ia);
|
|
if (!sc)
|
|
goto out_destroy;
|
|
|
|
sc->sc_xprt = r_xprt;
|
|
buf->rb_sc_ctxs[i] = sc;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_destroy:
|
|
rpcrdma_sendctxs_destroy(buf);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* The sendctx queue is not guaranteed to have a size that is a
|
|
* power of two, thus the helpers in circ_buf.h cannot be used.
|
|
* The other option is to use modulus (%), which can be expensive.
|
|
*/
|
|
static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf,
|
|
unsigned long item)
|
|
{
|
|
return likely(item < buf->rb_sc_last) ? item + 1 : 0;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_sendctx_get_locked - Acquire a send context
|
|
* @buf: transport buffers from which to acquire an unused context
|
|
*
|
|
* Returns pointer to a free send completion context; or NULL if
|
|
* the queue is empty.
|
|
*
|
|
* Usage: Called to acquire an SGE array before preparing a Send WR.
|
|
*
|
|
* The caller serializes calls to this function (per rpcrdma_buffer),
|
|
* and provides an effective memory barrier that flushes the new value
|
|
* of rb_sc_head.
|
|
*/
|
|
struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt;
|
|
struct rpcrdma_sendctx *sc;
|
|
unsigned long next_head;
|
|
|
|
next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head);
|
|
|
|
if (next_head == READ_ONCE(buf->rb_sc_tail))
|
|
goto out_emptyq;
|
|
|
|
/* ORDER: item must be accessed _before_ head is updated */
|
|
sc = buf->rb_sc_ctxs[next_head];
|
|
|
|
/* Releasing the lock in the caller acts as a memory
|
|
* barrier that flushes rb_sc_head.
|
|
*/
|
|
buf->rb_sc_head = next_head;
|
|
|
|
return sc;
|
|
|
|
out_emptyq:
|
|
/* The queue is "empty" if there have not been enough Send
|
|
* completions recently. This is a sign the Send Queue is
|
|
* backing up. Cause the caller to pause and try again.
|
|
*/
|
|
dprintk("RPC: %s: empty sendctx queue\n", __func__);
|
|
r_xprt = container_of(buf, struct rpcrdma_xprt, rx_buf);
|
|
r_xprt->rx_stats.empty_sendctx_q++;
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_sendctx_put_locked - Release a send context
|
|
* @sc: send context to release
|
|
*
|
|
* Usage: Called from Send completion to return a sendctxt
|
|
* to the queue.
|
|
*
|
|
* The caller serializes calls to this function (per rpcrdma_buffer).
|
|
*/
|
|
void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc)
|
|
{
|
|
struct rpcrdma_buffer *buf = &sc->sc_xprt->rx_buf;
|
|
unsigned long next_tail;
|
|
|
|
/* Unmap SGEs of previously completed by unsignaled
|
|
* Sends by walking up the queue until @sc is found.
|
|
*/
|
|
next_tail = buf->rb_sc_tail;
|
|
do {
|
|
next_tail = rpcrdma_sendctx_next(buf, next_tail);
|
|
|
|
/* ORDER: item must be accessed _before_ tail is updated */
|
|
rpcrdma_unmap_sendctx(buf->rb_sc_ctxs[next_tail]);
|
|
|
|
} while (buf->rb_sc_ctxs[next_tail] != sc);
|
|
|
|
/* Paired with READ_ONCE */
|
|
smp_store_release(&buf->rb_sc_tail, next_tail);
|
|
}
|
|
|
|
static void
|
|
rpcrdma_mr_recovery_worker(struct work_struct *work)
|
|
{
|
|
struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
|
|
rb_recovery_worker.work);
|
|
struct rpcrdma_mr *mr;
|
|
|
|
spin_lock(&buf->rb_recovery_lock);
|
|
while (!list_empty(&buf->rb_stale_mrs)) {
|
|
mr = rpcrdma_mr_pop(&buf->rb_stale_mrs);
|
|
spin_unlock(&buf->rb_recovery_lock);
|
|
|
|
trace_xprtrdma_recover_mr(mr);
|
|
mr->mr_xprt->rx_ia.ri_ops->ro_recover_mr(mr);
|
|
|
|
spin_lock(&buf->rb_recovery_lock);
|
|
}
|
|
spin_unlock(&buf->rb_recovery_lock);
|
|
}
|
|
|
|
void
|
|
rpcrdma_mr_defer_recovery(struct rpcrdma_mr *mr)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
|
|
spin_lock(&buf->rb_recovery_lock);
|
|
rpcrdma_mr_push(mr, &buf->rb_stale_mrs);
|
|
spin_unlock(&buf->rb_recovery_lock);
|
|
|
|
schedule_delayed_work(&buf->rb_recovery_worker, 0);
|
|
}
|
|
|
|
static void
|
|
rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
unsigned int count;
|
|
LIST_HEAD(free);
|
|
LIST_HEAD(all);
|
|
|
|
for (count = 0; count < 3; count++) {
|
|
struct rpcrdma_mr *mr;
|
|
int rc;
|
|
|
|
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
|
|
if (!mr)
|
|
break;
|
|
|
|
rc = ia->ri_ops->ro_init_mr(ia, mr);
|
|
if (rc) {
|
|
kfree(mr);
|
|
break;
|
|
}
|
|
|
|
mr->mr_xprt = r_xprt;
|
|
|
|
list_add(&mr->mr_list, &free);
|
|
list_add(&mr->mr_all, &all);
|
|
}
|
|
|
|
spin_lock(&buf->rb_mrlock);
|
|
list_splice(&free, &buf->rb_mrs);
|
|
list_splice(&all, &buf->rb_all);
|
|
r_xprt->rx_stats.mrs_allocated += count;
|
|
spin_unlock(&buf->rb_mrlock);
|
|
trace_xprtrdma_createmrs(r_xprt, count);
|
|
|
|
xprt_write_space(&r_xprt->rx_xprt);
|
|
}
|
|
|
|
static void
|
|
rpcrdma_mr_refresh_worker(struct work_struct *work)
|
|
{
|
|
struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
|
|
rb_refresh_worker.work);
|
|
struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
|
|
rx_buf);
|
|
|
|
rpcrdma_mrs_create(r_xprt);
|
|
}
|
|
|
|
struct rpcrdma_req *
|
|
rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
|
|
struct rpcrdma_regbuf *rb;
|
|
struct rpcrdma_req *req;
|
|
|
|
req = kzalloc(sizeof(*req), GFP_KERNEL);
|
|
if (req == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rb = rpcrdma_alloc_regbuf(RPCRDMA_HDRBUF_SIZE,
|
|
DMA_TO_DEVICE, GFP_KERNEL);
|
|
if (IS_ERR(rb)) {
|
|
kfree(req);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
req->rl_rdmabuf = rb;
|
|
xdr_buf_init(&req->rl_hdrbuf, rb->rg_base, rdmab_length(rb));
|
|
req->rl_buffer = buffer;
|
|
INIT_LIST_HEAD(&req->rl_registered);
|
|
|
|
spin_lock(&buffer->rb_reqslock);
|
|
list_add(&req->rl_all, &buffer->rb_allreqs);
|
|
spin_unlock(&buffer->rb_reqslock);
|
|
return req;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_create_rep - Allocate an rpcrdma_rep object
|
|
* @r_xprt: controlling transport
|
|
*
|
|
* Returns 0 on success or a negative errno on failure.
|
|
*/
|
|
int
|
|
rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_rep *rep;
|
|
int rc;
|
|
|
|
rc = -ENOMEM;
|
|
rep = kzalloc(sizeof(*rep), GFP_KERNEL);
|
|
if (rep == NULL)
|
|
goto out;
|
|
|
|
rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize,
|
|
DMA_FROM_DEVICE, GFP_KERNEL);
|
|
if (IS_ERR(rep->rr_rdmabuf)) {
|
|
rc = PTR_ERR(rep->rr_rdmabuf);
|
|
goto out_free;
|
|
}
|
|
xdr_buf_init(&rep->rr_hdrbuf, rep->rr_rdmabuf->rg_base,
|
|
rdmab_length(rep->rr_rdmabuf));
|
|
|
|
rep->rr_cqe.done = rpcrdma_wc_receive;
|
|
rep->rr_rxprt = r_xprt;
|
|
INIT_WORK(&rep->rr_work, rpcrdma_deferred_completion);
|
|
rep->rr_recv_wr.next = NULL;
|
|
rep->rr_recv_wr.wr_cqe = &rep->rr_cqe;
|
|
rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
|
|
rep->rr_recv_wr.num_sge = 1;
|
|
|
|
spin_lock(&buf->rb_lock);
|
|
list_add(&rep->rr_list, &buf->rb_recv_bufs);
|
|
spin_unlock(&buf->rb_lock);
|
|
return 0;
|
|
|
|
out_free:
|
|
kfree(rep);
|
|
out:
|
|
dprintk("RPC: %s: reply buffer %d alloc failed\n",
|
|
__func__, rc);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
int i, rc;
|
|
|
|
buf->rb_max_requests = r_xprt->rx_data.max_requests;
|
|
buf->rb_bc_srv_max_requests = 0;
|
|
spin_lock_init(&buf->rb_mrlock);
|
|
spin_lock_init(&buf->rb_lock);
|
|
spin_lock_init(&buf->rb_recovery_lock);
|
|
INIT_LIST_HEAD(&buf->rb_mrs);
|
|
INIT_LIST_HEAD(&buf->rb_all);
|
|
INIT_LIST_HEAD(&buf->rb_stale_mrs);
|
|
INIT_DELAYED_WORK(&buf->rb_refresh_worker,
|
|
rpcrdma_mr_refresh_worker);
|
|
INIT_DELAYED_WORK(&buf->rb_recovery_worker,
|
|
rpcrdma_mr_recovery_worker);
|
|
|
|
rpcrdma_mrs_create(r_xprt);
|
|
|
|
INIT_LIST_HEAD(&buf->rb_send_bufs);
|
|
INIT_LIST_HEAD(&buf->rb_allreqs);
|
|
spin_lock_init(&buf->rb_reqslock);
|
|
for (i = 0; i < buf->rb_max_requests; i++) {
|
|
struct rpcrdma_req *req;
|
|
|
|
req = rpcrdma_create_req(r_xprt);
|
|
if (IS_ERR(req)) {
|
|
dprintk("RPC: %s: request buffer %d alloc"
|
|
" failed\n", __func__, i);
|
|
rc = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
list_add(&req->rl_list, &buf->rb_send_bufs);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&buf->rb_recv_bufs);
|
|
for (i = 0; i <= buf->rb_max_requests; i++) {
|
|
rc = rpcrdma_create_rep(r_xprt);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
rc = rpcrdma_sendctxs_create(r_xprt);
|
|
if (rc)
|
|
goto out;
|
|
|
|
return 0;
|
|
out:
|
|
rpcrdma_buffer_destroy(buf);
|
|
return rc;
|
|
}
|
|
|
|
static struct rpcrdma_req *
|
|
rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_req *req;
|
|
|
|
req = list_first_entry(&buf->rb_send_bufs,
|
|
struct rpcrdma_req, rl_list);
|
|
list_del_init(&req->rl_list);
|
|
return req;
|
|
}
|
|
|
|
static struct rpcrdma_rep *
|
|
rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_rep *rep;
|
|
|
|
rep = list_first_entry(&buf->rb_recv_bufs,
|
|
struct rpcrdma_rep, rr_list);
|
|
list_del(&rep->rr_list);
|
|
return rep;
|
|
}
|
|
|
|
static void
|
|
rpcrdma_destroy_rep(struct rpcrdma_rep *rep)
|
|
{
|
|
rpcrdma_free_regbuf(rep->rr_rdmabuf);
|
|
kfree(rep);
|
|
}
|
|
|
|
void
|
|
rpcrdma_destroy_req(struct rpcrdma_req *req)
|
|
{
|
|
rpcrdma_free_regbuf(req->rl_recvbuf);
|
|
rpcrdma_free_regbuf(req->rl_sendbuf);
|
|
rpcrdma_free_regbuf(req->rl_rdmabuf);
|
|
kfree(req);
|
|
}
|
|
|
|
static void
|
|
rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
|
|
rx_buf);
|
|
struct rpcrdma_ia *ia = rdmab_to_ia(buf);
|
|
struct rpcrdma_mr *mr;
|
|
unsigned int count;
|
|
|
|
count = 0;
|
|
spin_lock(&buf->rb_mrlock);
|
|
while (!list_empty(&buf->rb_all)) {
|
|
mr = list_entry(buf->rb_all.next, struct rpcrdma_mr, mr_all);
|
|
list_del(&mr->mr_all);
|
|
|
|
spin_unlock(&buf->rb_mrlock);
|
|
ia->ri_ops->ro_release_mr(mr);
|
|
count++;
|
|
spin_lock(&buf->rb_mrlock);
|
|
}
|
|
spin_unlock(&buf->rb_mrlock);
|
|
r_xprt->rx_stats.mrs_allocated = 0;
|
|
|
|
dprintk("RPC: %s: released %u MRs\n", __func__, count);
|
|
}
|
|
|
|
void
|
|
rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
|
|
{
|
|
cancel_delayed_work_sync(&buf->rb_recovery_worker);
|
|
cancel_delayed_work_sync(&buf->rb_refresh_worker);
|
|
|
|
rpcrdma_sendctxs_destroy(buf);
|
|
|
|
while (!list_empty(&buf->rb_recv_bufs)) {
|
|
struct rpcrdma_rep *rep;
|
|
|
|
rep = rpcrdma_buffer_get_rep_locked(buf);
|
|
rpcrdma_destroy_rep(rep);
|
|
}
|
|
buf->rb_send_count = 0;
|
|
|
|
spin_lock(&buf->rb_reqslock);
|
|
while (!list_empty(&buf->rb_allreqs)) {
|
|
struct rpcrdma_req *req;
|
|
|
|
req = list_first_entry(&buf->rb_allreqs,
|
|
struct rpcrdma_req, rl_all);
|
|
list_del(&req->rl_all);
|
|
|
|
spin_unlock(&buf->rb_reqslock);
|
|
rpcrdma_destroy_req(req);
|
|
spin_lock(&buf->rb_reqslock);
|
|
}
|
|
spin_unlock(&buf->rb_reqslock);
|
|
buf->rb_recv_count = 0;
|
|
|
|
rpcrdma_mrs_destroy(buf);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_mr_get - Allocate an rpcrdma_mr object
|
|
* @r_xprt: controlling transport
|
|
*
|
|
* Returns an initialized rpcrdma_mr or NULL if no free
|
|
* rpcrdma_mr objects are available.
|
|
*/
|
|
struct rpcrdma_mr *
|
|
rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
|
|
struct rpcrdma_mr *mr = NULL;
|
|
|
|
spin_lock(&buf->rb_mrlock);
|
|
if (!list_empty(&buf->rb_mrs))
|
|
mr = rpcrdma_mr_pop(&buf->rb_mrs);
|
|
spin_unlock(&buf->rb_mrlock);
|
|
|
|
if (!mr)
|
|
goto out_nomrs;
|
|
return mr;
|
|
|
|
out_nomrs:
|
|
trace_xprtrdma_nomrs(r_xprt);
|
|
if (r_xprt->rx_ep.rep_connected != -ENODEV)
|
|
schedule_delayed_work(&buf->rb_refresh_worker, 0);
|
|
|
|
/* Allow the reply handler and refresh worker to run */
|
|
cond_resched();
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
__rpcrdma_mr_put(struct rpcrdma_buffer *buf, struct rpcrdma_mr *mr)
|
|
{
|
|
spin_lock(&buf->rb_mrlock);
|
|
rpcrdma_mr_push(mr, &buf->rb_mrs);
|
|
spin_unlock(&buf->rb_mrlock);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_mr_put - Release an rpcrdma_mr object
|
|
* @mr: object to release
|
|
*
|
|
*/
|
|
void
|
|
rpcrdma_mr_put(struct rpcrdma_mr *mr)
|
|
{
|
|
__rpcrdma_mr_put(&mr->mr_xprt->rx_buf, mr);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_mr_unmap_and_put - DMA unmap an MR and release it
|
|
* @mr: object to release
|
|
*
|
|
*/
|
|
void
|
|
rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr)
|
|
{
|
|
struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
|
|
|
|
trace_xprtrdma_dma_unmap(mr);
|
|
ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
|
|
mr->mr_sg, mr->mr_nents, mr->mr_dir);
|
|
__rpcrdma_mr_put(&r_xprt->rx_buf, mr);
|
|
}
|
|
|
|
static struct rpcrdma_rep *
|
|
rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers)
|
|
{
|
|
/* If an RPC previously completed without a reply (say, a
|
|
* credential problem or a soft timeout occurs) then hold off
|
|
* on supplying more Receive buffers until the number of new
|
|
* pending RPCs catches up to the number of posted Receives.
|
|
*/
|
|
if (unlikely(buffers->rb_send_count < buffers->rb_recv_count))
|
|
return NULL;
|
|
|
|
if (unlikely(list_empty(&buffers->rb_recv_bufs)))
|
|
return NULL;
|
|
buffers->rb_recv_count++;
|
|
return rpcrdma_buffer_get_rep_locked(buffers);
|
|
}
|
|
|
|
/*
|
|
* Get a set of request/reply buffers.
|
|
*
|
|
* Reply buffer (if available) is attached to send buffer upon return.
|
|
*/
|
|
struct rpcrdma_req *
|
|
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
|
|
{
|
|
struct rpcrdma_req *req;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
if (list_empty(&buffers->rb_send_bufs))
|
|
goto out_reqbuf;
|
|
buffers->rb_send_count++;
|
|
req = rpcrdma_buffer_get_req_locked(buffers);
|
|
req->rl_reply = rpcrdma_buffer_get_rep(buffers);
|
|
spin_unlock(&buffers->rb_lock);
|
|
|
|
return req;
|
|
|
|
out_reqbuf:
|
|
spin_unlock(&buffers->rb_lock);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Put request/reply buffers back into pool.
|
|
* Pre-decrement counter/array index.
|
|
*/
|
|
void
|
|
rpcrdma_buffer_put(struct rpcrdma_req *req)
|
|
{
|
|
struct rpcrdma_buffer *buffers = req->rl_buffer;
|
|
struct rpcrdma_rep *rep = req->rl_reply;
|
|
|
|
req->rl_reply = NULL;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
buffers->rb_send_count--;
|
|
list_add_tail(&req->rl_list, &buffers->rb_send_bufs);
|
|
if (rep) {
|
|
buffers->rb_recv_count--;
|
|
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
|
|
}
|
|
spin_unlock(&buffers->rb_lock);
|
|
}
|
|
|
|
/*
|
|
* Recover reply buffers from pool.
|
|
* This happens when recovering from disconnect.
|
|
*/
|
|
void
|
|
rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
|
|
{
|
|
struct rpcrdma_buffer *buffers = req->rl_buffer;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
req->rl_reply = rpcrdma_buffer_get_rep(buffers);
|
|
spin_unlock(&buffers->rb_lock);
|
|
}
|
|
|
|
/*
|
|
* Put reply buffers back into pool when not attached to
|
|
* request. This happens in error conditions.
|
|
*/
|
|
void
|
|
rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
|
|
{
|
|
struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
|
|
|
|
spin_lock(&buffers->rb_lock);
|
|
buffers->rb_recv_count--;
|
|
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
|
|
spin_unlock(&buffers->rb_lock);
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers
|
|
* @size: size of buffer to be allocated, in bytes
|
|
* @direction: direction of data movement
|
|
* @flags: GFP flags
|
|
*
|
|
* Returns an ERR_PTR, or a pointer to a regbuf, a buffer that
|
|
* can be persistently DMA-mapped for I/O.
|
|
*
|
|
* xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
|
|
* receiving the payload of RDMA RECV operations. During Long Calls
|
|
* or Replies they may be registered externally via ro_map.
|
|
*/
|
|
struct rpcrdma_regbuf *
|
|
rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction,
|
|
gfp_t flags)
|
|
{
|
|
struct rpcrdma_regbuf *rb;
|
|
|
|
rb = kmalloc(sizeof(*rb) + size, flags);
|
|
if (rb == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rb->rg_device = NULL;
|
|
rb->rg_direction = direction;
|
|
rb->rg_iov.length = size;
|
|
|
|
return rb;
|
|
}
|
|
|
|
/**
|
|
* __rpcrdma_map_regbuf - DMA-map a regbuf
|
|
* @ia: controlling rpcrdma_ia
|
|
* @rb: regbuf to be mapped
|
|
*/
|
|
bool
|
|
__rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
|
|
{
|
|
struct ib_device *device = ia->ri_device;
|
|
|
|
if (rb->rg_direction == DMA_NONE)
|
|
return false;
|
|
|
|
rb->rg_iov.addr = ib_dma_map_single(device,
|
|
(void *)rb->rg_base,
|
|
rdmab_length(rb),
|
|
rb->rg_direction);
|
|
if (ib_dma_mapping_error(device, rdmab_addr(rb)))
|
|
return false;
|
|
|
|
rb->rg_device = device;
|
|
rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey;
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb)
|
|
{
|
|
if (!rb)
|
|
return;
|
|
|
|
if (!rpcrdma_regbuf_is_mapped(rb))
|
|
return;
|
|
|
|
ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb),
|
|
rdmab_length(rb), rb->rg_direction);
|
|
rb->rg_device = NULL;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_free_regbuf - deregister and free registered buffer
|
|
* @rb: regbuf to be deregistered and freed
|
|
*/
|
|
void
|
|
rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb)
|
|
{
|
|
rpcrdma_dma_unmap_regbuf(rb);
|
|
kfree(rb);
|
|
}
|
|
|
|
/*
|
|
* Prepost any receive buffer, then post send.
|
|
*
|
|
* Receive buffer is donated to hardware, reclaimed upon recv completion.
|
|
*/
|
|
int
|
|
rpcrdma_ep_post(struct rpcrdma_ia *ia,
|
|
struct rpcrdma_ep *ep,
|
|
struct rpcrdma_req *req)
|
|
{
|
|
struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr;
|
|
int rc;
|
|
|
|
if (req->rl_reply) {
|
|
rc = rpcrdma_ep_post_recv(ia, req->rl_reply);
|
|
if (rc)
|
|
return rc;
|
|
req->rl_reply = NULL;
|
|
}
|
|
|
|
if (!ep->rep_send_count ||
|
|
test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags)) {
|
|
send_wr->send_flags |= IB_SEND_SIGNALED;
|
|
ep->rep_send_count = ep->rep_send_batch;
|
|
} else {
|
|
send_wr->send_flags &= ~IB_SEND_SIGNALED;
|
|
--ep->rep_send_count;
|
|
}
|
|
|
|
rc = ia->ri_ops->ro_send(ia, req);
|
|
trace_xprtrdma_post_send(req, rc);
|
|
if (rc)
|
|
return -ENOTCONN;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
|
|
struct rpcrdma_rep *rep)
|
|
{
|
|
struct ib_recv_wr *recv_wr_fail;
|
|
int rc;
|
|
|
|
if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf))
|
|
goto out_map;
|
|
rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail);
|
|
trace_xprtrdma_post_recv(rep, rc);
|
|
if (rc)
|
|
return -ENOTCONN;
|
|
return 0;
|
|
|
|
out_map:
|
|
pr_err("rpcrdma: failed to DMA map the Receive buffer\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
|
|
* @r_xprt: transport associated with these backchannel resources
|
|
* @count: minimum number of incoming requests expected
|
|
*
|
|
* Returns zero if all requested buffers were posted, or a negative errno.
|
|
*/
|
|
int
|
|
rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count)
|
|
{
|
|
struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
struct rpcrdma_rep *rep;
|
|
int rc;
|
|
|
|
while (count--) {
|
|
spin_lock(&buffers->rb_lock);
|
|
if (list_empty(&buffers->rb_recv_bufs))
|
|
goto out_reqbuf;
|
|
rep = rpcrdma_buffer_get_rep_locked(buffers);
|
|
spin_unlock(&buffers->rb_lock);
|
|
|
|
rc = rpcrdma_ep_post_recv(ia, rep);
|
|
if (rc)
|
|
goto out_rc;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_reqbuf:
|
|
spin_unlock(&buffers->rb_lock);
|
|
trace_xprtrdma_noreps(r_xprt);
|
|
return -ENOMEM;
|
|
|
|
out_rc:
|
|
rpcrdma_recv_buffer_put(rep);
|
|
return rc;
|
|
}
|