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597 lines
18 KiB
597 lines
18 KiB
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ |
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/* |
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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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#ifndef _LINUX_SUNRPC_XPRT_RDMA_H |
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#define _LINUX_SUNRPC_XPRT_RDMA_H |
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#include <linux/wait.h> /* wait_queue_head_t, etc */ |
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#include <linux/spinlock.h> /* spinlock_t, etc */ |
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#include <linux/atomic.h> /* atomic_t, etc */ |
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#include <linux/kref.h> /* struct kref */ |
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#include <linux/workqueue.h> /* struct work_struct */ |
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#include <linux/llist.h> |
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#include <rdma/rdma_cm.h> /* RDMA connection api */ |
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#include <rdma/ib_verbs.h> /* RDMA verbs api */ |
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#include <linux/sunrpc/clnt.h> /* rpc_xprt */ |
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#include <linux/sunrpc/rpc_rdma_cid.h> /* completion IDs */ |
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#include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ |
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#include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ |
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#define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ |
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#define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ |
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#define RPCRDMA_BIND_TO (60U * HZ) |
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#define RPCRDMA_INIT_REEST_TO (5U * HZ) |
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#define RPCRDMA_MAX_REEST_TO (30U * HZ) |
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#define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) |
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/* |
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* RDMA Endpoint -- connection endpoint details |
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*/ |
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struct rpcrdma_ep { |
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struct kref re_kref; |
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struct rdma_cm_id *re_id; |
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struct ib_pd *re_pd; |
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unsigned int re_max_rdma_segs; |
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unsigned int re_max_fr_depth; |
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bool re_implicit_roundup; |
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enum ib_mr_type re_mrtype; |
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struct completion re_done; |
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unsigned int re_send_count; |
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unsigned int re_send_batch; |
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unsigned int re_max_inline_send; |
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unsigned int re_max_inline_recv; |
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int re_async_rc; |
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int re_connect_status; |
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atomic_t re_receiving; |
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atomic_t re_force_disconnect; |
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struct ib_qp_init_attr re_attr; |
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wait_queue_head_t re_connect_wait; |
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struct rpc_xprt *re_xprt; |
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struct rpcrdma_connect_private |
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re_cm_private; |
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struct rdma_conn_param re_remote_cma; |
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int re_receive_count; |
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unsigned int re_max_requests; /* depends on device */ |
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unsigned int re_inline_send; /* negotiated */ |
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unsigned int re_inline_recv; /* negotiated */ |
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atomic_t re_completion_ids; |
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}; |
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/* Pre-allocate extra Work Requests for handling reverse-direction |
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* Receives and Sends. This is a fixed value because the Work Queues |
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* are allocated when the forward channel is set up, long before the |
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* backchannel is provisioned. This value is two times |
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* NFS4_DEF_CB_SLOT_TABLE_SIZE. |
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*/ |
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#if defined(CONFIG_SUNRPC_BACKCHANNEL) |
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#define RPCRDMA_BACKWARD_WRS (32) |
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#else |
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#define RPCRDMA_BACKWARD_WRS (0) |
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#endif |
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/* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV |
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*/ |
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struct rpcrdma_regbuf { |
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struct ib_sge rg_iov; |
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struct ib_device *rg_device; |
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enum dma_data_direction rg_direction; |
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void *rg_data; |
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}; |
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static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb) |
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{ |
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return rb->rg_iov.addr; |
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} |
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static inline u32 rdmab_length(struct rpcrdma_regbuf *rb) |
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{ |
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return rb->rg_iov.length; |
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} |
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static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb) |
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{ |
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return rb->rg_iov.lkey; |
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} |
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static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb) |
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{ |
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return rb->rg_device; |
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} |
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static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) |
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{ |
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return rb->rg_data; |
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} |
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#define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN) |
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/* To ensure a transport can always make forward progress, |
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* the number of RDMA segments allowed in header chunk lists |
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* is capped at 16. This prevents less-capable devices from |
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* overrunning the Send buffer while building chunk lists. |
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* |
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* Elements of the Read list take up more room than the |
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* Write list or Reply chunk. 16 read segments means the |
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* chunk lists cannot consume more than |
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* |
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* ((16 + 2) * read segment size) + 1 XDR words, |
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* |
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* or about 400 bytes. The fixed part of the header is |
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* another 24 bytes. Thus when the inline threshold is |
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* 1024 bytes, at least 600 bytes are available for RPC |
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* message bodies. |
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*/ |
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enum { |
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RPCRDMA_MAX_HDR_SEGS = 16, |
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}; |
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/* |
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* struct rpcrdma_rep -- this structure encapsulates state required |
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* to receive and complete an RPC Reply, asychronously. It needs |
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* several pieces of state: |
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* |
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* o receive buffer and ib_sge (donated to provider) |
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* o status of receive (success or not, length, inv rkey) |
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* o bookkeeping state to get run by reply handler (XDR stream) |
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* |
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* These structures are allocated during transport initialization. |
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* N of these are associated with a transport instance, managed by |
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* struct rpcrdma_buffer. N is the max number of outstanding RPCs. |
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*/ |
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struct rpcrdma_rep { |
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struct ib_cqe rr_cqe; |
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struct rpc_rdma_cid rr_cid; |
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__be32 rr_xid; |
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__be32 rr_vers; |
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__be32 rr_proc; |
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int rr_wc_flags; |
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u32 rr_inv_rkey; |
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bool rr_temp; |
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struct rpcrdma_regbuf *rr_rdmabuf; |
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struct rpcrdma_xprt *rr_rxprt; |
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struct rpc_rqst *rr_rqst; |
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struct xdr_buf rr_hdrbuf; |
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struct xdr_stream rr_stream; |
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struct llist_node rr_node; |
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struct ib_recv_wr rr_recv_wr; |
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struct list_head rr_all; |
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}; |
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/* To reduce the rate at which a transport invokes ib_post_recv |
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* (and thus the hardware doorbell rate), xprtrdma posts Receive |
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* WRs in batches. |
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* |
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* Setting this to zero disables Receive post batching. |
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*/ |
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enum { |
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RPCRDMA_MAX_RECV_BATCH = 7, |
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}; |
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/* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes |
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*/ |
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struct rpcrdma_req; |
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struct rpcrdma_sendctx { |
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struct ib_cqe sc_cqe; |
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struct rpc_rdma_cid sc_cid; |
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struct rpcrdma_req *sc_req; |
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unsigned int sc_unmap_count; |
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struct ib_sge sc_sges[]; |
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}; |
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/* |
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* struct rpcrdma_mr - external memory region metadata |
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* |
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* An external memory region is any buffer or page that is registered |
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* on the fly (ie, not pre-registered). |
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*/ |
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struct rpcrdma_req; |
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struct rpcrdma_mr { |
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struct list_head mr_list; |
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struct rpcrdma_req *mr_req; |
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struct ib_mr *mr_ibmr; |
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struct ib_device *mr_device; |
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struct scatterlist *mr_sg; |
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int mr_nents; |
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enum dma_data_direction mr_dir; |
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struct ib_cqe mr_cqe; |
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struct completion mr_linv_done; |
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union { |
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struct ib_reg_wr mr_regwr; |
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struct ib_send_wr mr_invwr; |
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}; |
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struct rpcrdma_xprt *mr_xprt; |
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u32 mr_handle; |
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u32 mr_length; |
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u64 mr_offset; |
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struct list_head mr_all; |
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struct rpc_rdma_cid mr_cid; |
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}; |
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/* |
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* struct rpcrdma_req -- structure central to the request/reply sequence. |
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* |
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* N of these are associated with a transport instance, and stored in |
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* struct rpcrdma_buffer. N is the max number of outstanding requests. |
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* |
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* It includes pre-registered buffer memory for send AND recv. |
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* The recv buffer, however, is not owned by this structure, and |
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* is "donated" to the hardware when a recv is posted. When a |
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* reply is handled, the recv buffer used is given back to the |
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* struct rpcrdma_req associated with the request. |
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* |
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* In addition to the basic memory, this structure includes an array |
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* of iovs for send operations. The reason is that the iovs passed to |
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* ib_post_{send,recv} must not be modified until the work request |
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* completes. |
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*/ |
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/* Maximum number of page-sized "segments" per chunk list to be |
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* registered or invalidated. Must handle a Reply chunk: |
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*/ |
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enum { |
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RPCRDMA_MAX_IOV_SEGS = 3, |
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RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1, |
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RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS + |
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RPCRDMA_MAX_IOV_SEGS, |
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}; |
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/* Arguments for DMA mapping and registration */ |
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struct rpcrdma_mr_seg { |
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u32 mr_len; /* length of segment */ |
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struct page *mr_page; /* underlying struct page */ |
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u64 mr_offset; /* IN: page offset, OUT: iova */ |
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}; |
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/* The Send SGE array is provisioned to send a maximum size |
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* inline request: |
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* - RPC-over-RDMA header |
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* - xdr_buf head iovec |
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* - RPCRDMA_MAX_INLINE bytes, in pages |
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* - xdr_buf tail iovec |
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* |
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* The actual number of array elements consumed by each RPC |
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* depends on the device's max_sge limit. |
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*/ |
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enum { |
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RPCRDMA_MIN_SEND_SGES = 3, |
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RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT, |
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RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1, |
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}; |
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struct rpcrdma_buffer; |
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struct rpcrdma_req { |
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struct list_head rl_list; |
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struct rpc_rqst rl_slot; |
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struct rpcrdma_rep *rl_reply; |
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struct xdr_stream rl_stream; |
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struct xdr_buf rl_hdrbuf; |
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struct ib_send_wr rl_wr; |
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struct rpcrdma_sendctx *rl_sendctx; |
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struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */ |
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struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */ |
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struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */ |
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struct list_head rl_all; |
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struct kref rl_kref; |
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struct list_head rl_free_mrs; |
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struct list_head rl_registered; |
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struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; |
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}; |
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static inline struct rpcrdma_req * |
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rpcr_to_rdmar(const struct rpc_rqst *rqst) |
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{ |
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return container_of(rqst, struct rpcrdma_req, rl_slot); |
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} |
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static inline void |
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rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list) |
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{ |
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list_add(&mr->mr_list, list); |
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} |
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static inline struct rpcrdma_mr * |
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rpcrdma_mr_pop(struct list_head *list) |
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{ |
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struct rpcrdma_mr *mr; |
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mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list); |
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if (mr) |
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list_del_init(&mr->mr_list); |
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return mr; |
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} |
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/* |
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* struct rpcrdma_buffer -- holds list/queue of pre-registered memory for |
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* inline requests/replies, and client/server credits. |
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* |
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* One of these is associated with a transport instance |
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*/ |
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struct rpcrdma_buffer { |
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spinlock_t rb_lock; |
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struct list_head rb_send_bufs; |
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struct list_head rb_mrs; |
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unsigned long rb_sc_head; |
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unsigned long rb_sc_tail; |
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unsigned long rb_sc_last; |
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struct rpcrdma_sendctx **rb_sc_ctxs; |
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struct list_head rb_allreqs; |
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struct list_head rb_all_mrs; |
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struct list_head rb_all_reps; |
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struct llist_head rb_free_reps; |
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__be32 rb_max_requests; |
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u32 rb_credits; /* most recent credit grant */ |
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u32 rb_bc_srv_max_requests; |
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u32 rb_bc_max_requests; |
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struct work_struct rb_refresh_worker; |
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}; |
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/* |
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* Statistics for RPCRDMA |
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*/ |
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struct rpcrdma_stats { |
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/* accessed when sending a call */ |
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unsigned long read_chunk_count; |
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unsigned long write_chunk_count; |
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unsigned long reply_chunk_count; |
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unsigned long long total_rdma_request; |
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/* rarely accessed error counters */ |
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unsigned long long pullup_copy_count; |
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unsigned long hardway_register_count; |
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unsigned long failed_marshal_count; |
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unsigned long bad_reply_count; |
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unsigned long mrs_recycled; |
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unsigned long mrs_orphaned; |
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unsigned long mrs_allocated; |
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unsigned long empty_sendctx_q; |
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/* accessed when receiving a reply */ |
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unsigned long long total_rdma_reply; |
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unsigned long long fixup_copy_count; |
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unsigned long reply_waits_for_send; |
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unsigned long local_inv_needed; |
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unsigned long nomsg_call_count; |
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unsigned long bcall_count; |
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}; |
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/* |
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* RPCRDMA transport -- encapsulates the structures above for |
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* integration with RPC. |
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* |
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* The contained structures are embedded, not pointers, |
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* for convenience. This structure need not be visible externally. |
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* |
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* It is allocated and initialized during mount, and released |
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* during unmount. |
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*/ |
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struct rpcrdma_xprt { |
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struct rpc_xprt rx_xprt; |
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struct rpcrdma_ep *rx_ep; |
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struct rpcrdma_buffer rx_buf; |
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struct delayed_work rx_connect_worker; |
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struct rpc_timeout rx_timeout; |
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struct rpcrdma_stats rx_stats; |
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}; |
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#define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) |
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static inline const char * |
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rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt) |
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{ |
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return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]; |
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} |
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static inline const char * |
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rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt) |
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{ |
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return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT]; |
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} |
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/* Setting this to 0 ensures interoperability with early servers. |
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* Setting this to 1 enhances certain unaligned read/write performance. |
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* Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ |
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extern int xprt_rdma_pad_optimize; |
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/* This setting controls the hunt for a supported memory |
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* registration strategy. |
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*/ |
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extern unsigned int xprt_rdma_memreg_strategy; |
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/* |
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* Endpoint calls - xprtrdma/verbs.c |
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*/ |
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void rpcrdma_force_disconnect(struct rpcrdma_ep *ep); |
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void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc); |
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int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt); |
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void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt); |
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void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp); |
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/* |
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* Buffer calls - xprtrdma/verbs.c |
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*/ |
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struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size, |
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gfp_t flags); |
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int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); |
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void rpcrdma_req_destroy(struct rpcrdma_req *req); |
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int rpcrdma_buffer_create(struct rpcrdma_xprt *); |
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void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); |
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struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt); |
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struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt); |
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void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt); |
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struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); |
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void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers, |
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struct rpcrdma_req *req); |
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void rpcrdma_rep_put(struct rpcrdma_buffer *buf, struct rpcrdma_rep *rep); |
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void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req); |
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bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size, |
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gfp_t flags); |
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bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, |
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struct rpcrdma_regbuf *rb); |
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/** |
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* rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped |
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* |
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* Returns true if the buffer is now mapped to rb->rg_device. |
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*/ |
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static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb) |
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{ |
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return rb->rg_device != NULL; |
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} |
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/** |
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* rpcrdma_regbuf_dma_map - DMA-map a regbuf |
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* @r_xprt: controlling transport instance |
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* @rb: regbuf to be mapped |
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* |
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* Returns true if the buffer is currently DMA mapped. |
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*/ |
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static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt, |
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struct rpcrdma_regbuf *rb) |
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{ |
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if (likely(rpcrdma_regbuf_is_mapped(rb))) |
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return true; |
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return __rpcrdma_regbuf_dma_map(r_xprt, rb); |
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} |
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/* |
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* Wrappers for chunk registration, shared by read/write chunk code. |
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*/ |
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static inline enum dma_data_direction |
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rpcrdma_data_dir(bool writing) |
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{ |
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return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; |
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} |
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/* Memory registration calls xprtrdma/frwr_ops.c |
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*/ |
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void frwr_reset(struct rpcrdma_req *req); |
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int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device); |
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int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr); |
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void frwr_mr_release(struct rpcrdma_mr *mr); |
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struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, |
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struct rpcrdma_mr_seg *seg, |
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int nsegs, bool writing, __be32 xid, |
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struct rpcrdma_mr *mr); |
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int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); |
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void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs); |
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void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); |
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void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req); |
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/* |
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* RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c |
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*/ |
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enum rpcrdma_chunktype { |
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rpcrdma_noch = 0, |
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rpcrdma_noch_pullup, |
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rpcrdma_noch_mapped, |
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rpcrdma_readch, |
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rpcrdma_areadch, |
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rpcrdma_writech, |
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rpcrdma_replych |
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}; |
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int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt, |
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struct rpcrdma_req *req, u32 hdrlen, |
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struct xdr_buf *xdr, |
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enum rpcrdma_chunktype rtype); |
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void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc); |
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int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst); |
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void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep); |
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void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt); |
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void rpcrdma_complete_rqst(struct rpcrdma_rep *rep); |
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void rpcrdma_unpin_rqst(struct rpcrdma_rep *rep); |
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void rpcrdma_reply_handler(struct rpcrdma_rep *rep); |
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static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len) |
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{ |
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xdr->head[0].iov_len = len; |
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xdr->len = len; |
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} |
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|
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/* RPC/RDMA module init - xprtrdma/transport.c |
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*/ |
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extern unsigned int xprt_rdma_max_inline_read; |
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extern unsigned int xprt_rdma_max_inline_write; |
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void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap); |
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void xprt_rdma_free_addresses(struct rpc_xprt *xprt); |
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void xprt_rdma_close(struct rpc_xprt *xprt); |
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void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq); |
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int xprt_rdma_init(void); |
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void xprt_rdma_cleanup(void); |
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|
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/* Backchannel calls - xprtrdma/backchannel.c |
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*/ |
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#if defined(CONFIG_SUNRPC_BACKCHANNEL) |
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int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int); |
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size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *); |
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unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *); |
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int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int); |
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void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *); |
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int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst); |
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void xprt_rdma_bc_free_rqst(struct rpc_rqst *); |
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void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); |
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
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extern struct xprt_class xprt_rdma_bc; |
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#endif /* _LINUX_SUNRPC_XPRT_RDMA_H */
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