/* 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.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_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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};
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/* Pre-allocate extra Work Requests for handling backward receives
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* and sends. This is a fixed value because the Work Queues are
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* 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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__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 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_frwr {
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struct ib_mr *fr_mr;
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struct ib_cqe fr_cqe;
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struct completion fr_linv_done;
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union {
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struct ib_reg_wr fr_regwr;
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struct ib_send_wr fr_invwr;
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};
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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 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 rpcrdma_frwr frwr;
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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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};
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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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struct rpcrdma_mr_seg { /* chunk descriptors */
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u32 mr_len; /* length of chunk or segment */
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struct page *mr_page; /* owning page, if any */
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char *mr_offset; /* kva if no page, else offset */
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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_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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int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
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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_mr_put(struct rpcrdma_mr *mr);
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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_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req);
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void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
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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_release_mr(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_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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/* 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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/* 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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