forked from Minki/linux
a3aa8b2b84
Move the the I/O direction field from rpcrdma_mr_seg into the rpcrdma_frmr. This makes it possible to DMA-unmap the frwr long after an RPC has exited and its rpcrdma_mr_seg array has been released and re-used. This might occur if an RPC times out while waiting for a new connection to be established. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
576 lines
18 KiB
C
576 lines
18 KiB
C
/*
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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/workqueue.h> /* struct work_struct */
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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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* Interface Adapter -- one per transport instance
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*/
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struct rpcrdma_ia {
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const struct rpcrdma_memreg_ops *ri_ops;
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rwlock_t ri_qplock;
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struct ib_device *ri_device;
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struct rdma_cm_id *ri_id;
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struct ib_pd *ri_pd;
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struct ib_mr *ri_dma_mr;
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struct completion ri_done;
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int ri_async_rc;
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unsigned int ri_max_frmr_depth;
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unsigned int ri_max_inline_write;
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unsigned int ri_max_inline_read;
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struct ib_qp_attr ri_qp_attr;
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struct ib_qp_init_attr ri_qp_init_attr;
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};
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/*
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* RDMA Endpoint -- one per transport instance
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*/
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struct rpcrdma_ep {
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atomic_t rep_cqcount;
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int rep_cqinit;
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int rep_connected;
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struct ib_qp_init_attr rep_attr;
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wait_queue_head_t rep_connect_wait;
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struct rdma_conn_param rep_remote_cma;
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struct sockaddr_storage rep_remote_addr;
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struct delayed_work rep_connect_worker;
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};
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#define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
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#define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
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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.
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*/
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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#define RPCRDMA_BACKWARD_WRS (8)
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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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* The below structure appears at the front of a large region of kmalloc'd
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* memory, which always starts on a good alignment boundary.
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*/
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struct rpcrdma_regbuf {
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size_t rg_size;
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struct rpcrdma_req *rg_owner;
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struct ib_sge rg_iov;
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__be32 rg_base[0] __attribute__ ((aligned(256)));
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};
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static inline u64
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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
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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
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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 rpcrdma_msg *
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rdmab_to_msg(struct rpcrdma_regbuf *rb)
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{
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return (struct rpcrdma_msg *)rb->rg_base;
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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 8. This prevents less-capable devices and
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* memory registrations from overrunning the Send buffer
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* 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. 8 read segments means the Read
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* list (or Write list or Reply chunk) cannot consume more
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* than
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*
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* ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes.
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*
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* And the fixed part of the header is another 24 bytes.
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*
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* The smallest inline threshold is 1024 bytes, ensuring that
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* at least 750 bytes are available for RPC messages.
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*/
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#define RPCRDMA_MAX_HDR_SEGS (8)
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/*
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* struct rpcrdma_rep -- this structure encapsulates state required to recv
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* and complete a reply, asychronously. It needs several pieces of
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* state:
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* o recv buffer (posted to provider)
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* o ib_sge (also donated to provider)
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* o status of reply (length, success or not)
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* o bookkeeping state to get run by tasklet (list, etc)
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*
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* These are allocated during initialization, per-transport instance;
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* however, the tasklet execution list itself is global, as it should
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* always be pretty short.
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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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#define RPCRDMA_MAX_DATA_SEGS ((1 * 1024 * 1024) / PAGE_SIZE)
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/* data segments + head/tail for Call + head/tail for Reply */
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#define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 4)
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struct rpcrdma_buffer;
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struct rpcrdma_rep {
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struct ib_cqe rr_cqe;
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unsigned int rr_len;
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struct ib_device *rr_device;
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struct rpcrdma_xprt *rr_rxprt;
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struct work_struct rr_work;
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struct list_head rr_list;
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struct rpcrdma_regbuf *rr_rdmabuf;
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};
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#define RPCRDMA_BAD_LEN (~0U)
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/*
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* struct rpcrdma_mw - 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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* Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
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* call_allocate, rpcrdma_buffer_get() assigns one to each segment in
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* an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
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* track of registration metadata while each RPC is pending.
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* rpcrdma_deregister_external() uses this metadata to unmap and
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* release these resources when an RPC is complete.
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*/
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enum rpcrdma_frmr_state {
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FRMR_IS_INVALID, /* ready to be used */
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FRMR_IS_VALID, /* in use */
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FRMR_IS_STALE, /* failed completion */
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};
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struct rpcrdma_frmr {
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struct scatterlist *fr_sg;
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int fr_nents;
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enum dma_data_direction fr_dir;
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struct ib_mr *fr_mr;
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struct ib_cqe fr_cqe;
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enum rpcrdma_frmr_state fr_state;
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struct completion fr_linv_done;
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struct work_struct fr_work;
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struct rpcrdma_xprt *fr_xprt;
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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_fmr {
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struct ib_fmr *fmr;
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u64 *physaddrs;
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};
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struct rpcrdma_mw {
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union {
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struct rpcrdma_fmr fmr;
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struct rpcrdma_frmr frmr;
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};
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struct list_head mw_list;
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struct list_head mw_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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* NOTES:
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* o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we
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* marshal. The number needed varies depending on the iov lists that
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* are passed to us, the memory registration mode we are in, and if
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* physical addressing is used, the layout.
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*/
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struct rpcrdma_mr_seg { /* chunk descriptors */
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struct rpcrdma_mw *rl_mw; /* registered MR */
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u64 mr_base; /* registration result */
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u32 mr_rkey; /* registration result */
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u32 mr_len; /* length of chunk or segment */
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int mr_nsegs; /* number of segments in chunk or 0 */
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enum dma_data_direction mr_dir; /* segment mapping direction */
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dma_addr_t mr_dma; /* segment mapping address */
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size_t mr_dmalen; /* segment mapping length */
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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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#define RPCRDMA_MAX_IOVS (2)
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struct rpcrdma_req {
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struct list_head rl_free;
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unsigned int rl_niovs;
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unsigned int rl_nchunks;
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unsigned int rl_connect_cookie;
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struct rpcrdma_buffer *rl_buffer;
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struct rpcrdma_rep *rl_reply;/* holder for reply buffer */
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struct ib_sge rl_send_iov[RPCRDMA_MAX_IOVS];
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struct rpcrdma_regbuf *rl_rdmabuf;
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struct rpcrdma_regbuf *rl_sendbuf;
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struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];
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struct rpcrdma_mr_seg *rl_nextseg;
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struct ib_cqe rl_cqe;
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struct list_head rl_all;
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bool rl_backchannel;
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};
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static inline struct rpcrdma_req *
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rpcr_to_rdmar(struct rpc_rqst *rqst)
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{
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void *buffer = rqst->rq_buffer;
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struct rpcrdma_regbuf *rb;
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rb = container_of(buffer, struct rpcrdma_regbuf, rg_base);
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return rb->rg_owner;
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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_mwlock; /* protect rb_mws list */
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struct list_head rb_mws;
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struct list_head rb_all;
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char *rb_pool;
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spinlock_t rb_lock; /* protect buf lists */
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struct list_head rb_send_bufs;
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struct list_head rb_recv_bufs;
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u32 rb_max_requests;
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atomic_t rb_credits; /* most recent credit grant */
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u32 rb_bc_srv_max_requests;
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spinlock_t rb_reqslock; /* protect rb_allreqs */
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struct list_head rb_allreqs;
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u32 rb_bc_max_requests;
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};
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#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
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/*
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* Internal structure for transport instance creation. This
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* exists primarily for modularity.
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*
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* This data should be set with mount options
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*/
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struct rpcrdma_create_data_internal {
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struct sockaddr_storage addr; /* RDMA server address */
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unsigned int max_requests; /* max requests (slots) in flight */
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unsigned int rsize; /* mount rsize - max read hdr+data */
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unsigned int wsize; /* mount wsize - max write hdr+data */
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unsigned int inline_rsize; /* max non-rdma read data payload */
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unsigned int inline_wsize; /* max non-rdma write data payload */
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unsigned int padding; /* non-rdma write header padding */
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};
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#define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
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(rpcx_to_rdmad(rq->rq_xprt).inline_rsize)
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#define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
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(rpcx_to_rdmad(rq->rq_xprt).inline_wsize)
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#define RPCRDMA_INLINE_PAD_VALUE(rq)\
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rpcx_to_rdmad(rq->rq_xprt).padding
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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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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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unsigned long long total_rdma_reply;
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unsigned long long pullup_copy_count;
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unsigned long long fixup_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 nomsg_call_count;
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unsigned long bcall_count;
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};
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/*
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* Per-registration mode operations
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*/
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struct rpcrdma_xprt;
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struct rpcrdma_memreg_ops {
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int (*ro_map)(struct rpcrdma_xprt *,
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struct rpcrdma_mr_seg *, int, bool);
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void (*ro_unmap_sync)(struct rpcrdma_xprt *,
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struct rpcrdma_req *);
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int (*ro_unmap)(struct rpcrdma_xprt *,
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struct rpcrdma_mr_seg *);
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int (*ro_open)(struct rpcrdma_ia *,
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struct rpcrdma_ep *,
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struct rpcrdma_create_data_internal *);
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size_t (*ro_maxpages)(struct rpcrdma_xprt *);
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int (*ro_init)(struct rpcrdma_xprt *);
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void (*ro_destroy)(struct rpcrdma_buffer *);
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const char *ro_displayname;
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};
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extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
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extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
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extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops;
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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_ia rx_ia;
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struct rpcrdma_ep rx_ep;
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struct rpcrdma_buffer rx_buf;
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struct rpcrdma_create_data_internal rx_data;
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struct delayed_work rx_connect_worker;
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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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#define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
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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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/*
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* Interface Adapter calls - xprtrdma/verbs.c
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*/
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int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
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void rpcrdma_ia_close(struct rpcrdma_ia *);
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/*
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* Endpoint calls - xprtrdma/verbs.c
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*/
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int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
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struct rpcrdma_create_data_internal *);
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void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
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int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
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void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
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int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
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struct rpcrdma_req *);
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int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
|
|
struct rpcrdma_rep *);
|
|
|
|
/*
|
|
* Buffer calls - xprtrdma/verbs.c
|
|
*/
|
|
struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
|
|
struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *);
|
|
void rpcrdma_destroy_req(struct rpcrdma_ia *, struct rpcrdma_req *);
|
|
int rpcrdma_buffer_create(struct rpcrdma_xprt *);
|
|
void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
|
|
|
|
struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *);
|
|
void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *);
|
|
struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
|
|
void rpcrdma_buffer_put(struct rpcrdma_req *);
|
|
void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
|
|
void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
|
|
|
|
struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *,
|
|
size_t, gfp_t);
|
|
void rpcrdma_free_regbuf(struct rpcrdma_ia *,
|
|
struct rpcrdma_regbuf *);
|
|
|
|
int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
|
|
|
|
int frwr_alloc_recovery_wq(void);
|
|
void frwr_destroy_recovery_wq(void);
|
|
|
|
int rpcrdma_alloc_wq(void);
|
|
void rpcrdma_destroy_wq(void);
|
|
|
|
/*
|
|
* Wrappers for chunk registration, shared by read/write chunk code.
|
|
*/
|
|
|
|
void rpcrdma_mapping_error(struct rpcrdma_mr_seg *);
|
|
|
|
static inline enum dma_data_direction
|
|
rpcrdma_data_dir(bool writing)
|
|
{
|
|
return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
|
|
}
|
|
|
|
static inline void
|
|
rpcrdma_map_one(struct ib_device *device, struct rpcrdma_mr_seg *seg,
|
|
enum dma_data_direction direction)
|
|
{
|
|
seg->mr_dir = direction;
|
|
seg->mr_dmalen = seg->mr_len;
|
|
|
|
if (seg->mr_page)
|
|
seg->mr_dma = ib_dma_map_page(device,
|
|
seg->mr_page, offset_in_page(seg->mr_offset),
|
|
seg->mr_dmalen, seg->mr_dir);
|
|
else
|
|
seg->mr_dma = ib_dma_map_single(device,
|
|
seg->mr_offset,
|
|
seg->mr_dmalen, seg->mr_dir);
|
|
|
|
if (ib_dma_mapping_error(device, seg->mr_dma))
|
|
rpcrdma_mapping_error(seg);
|
|
}
|
|
|
|
static inline void
|
|
rpcrdma_unmap_one(struct ib_device *device, struct rpcrdma_mr_seg *seg)
|
|
{
|
|
if (seg->mr_page)
|
|
ib_dma_unmap_page(device,
|
|
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
|
|
else
|
|
ib_dma_unmap_single(device,
|
|
seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
|
|
}
|
|
|
|
/*
|
|
* RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
|
|
*/
|
|
void rpcrdma_connect_worker(struct work_struct *);
|
|
void rpcrdma_conn_func(struct rpcrdma_ep *);
|
|
void rpcrdma_reply_handler(struct rpcrdma_rep *);
|
|
|
|
/*
|
|
* RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
|
|
*/
|
|
int rpcrdma_marshal_req(struct rpc_rqst *);
|
|
void rpcrdma_set_max_header_sizes(struct rpcrdma_ia *,
|
|
struct rpcrdma_create_data_internal *,
|
|
unsigned int);
|
|
|
|
/* RPC/RDMA module init - xprtrdma/transport.c
|
|
*/
|
|
extern unsigned int xprt_rdma_max_inline_read;
|
|
void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
|
|
void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
|
|
void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
|
|
int xprt_rdma_init(void);
|
|
void xprt_rdma_cleanup(void);
|
|
|
|
/* Backchannel calls - xprtrdma/backchannel.c
|
|
*/
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
|
|
int xprt_rdma_bc_up(struct svc_serv *, struct net *);
|
|
size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
|
|
int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
|
|
void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
|
|
int rpcrdma_bc_marshal_reply(struct rpc_rqst *);
|
|
void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
|
|
void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
extern struct xprt_class xprt_rdma_bc;
|
|
|
|
#endif /* _LINUX_SUNRPC_XPRT_RDMA_H */
|