359 lines
13 KiB
C
359 lines
13 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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/*
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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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struct rdma_cm_id *ri_id;
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struct ib_pd *ri_pd;
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struct ib_mr *ri_bind_mem;
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u32 ri_dma_lkey;
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int ri_have_dma_lkey;
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struct completion ri_done;
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int ri_async_rc;
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enum rpcrdma_memreg ri_memreg_strategy;
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unsigned int ri_max_frmr_depth;
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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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#define RPCRDMA_WC_BUDGET (128)
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#define RPCRDMA_POLLSIZE (16)
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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 rpcrdma_ia *rep_ia;
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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 ib_sge rep_pad; /* holds zeroed pad */
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struct ib_mr *rep_pad_mr; /* holds zeroed pad */
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void (*rep_func)(struct rpcrdma_ep *);
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struct rpc_xprt *rep_xprt; /* for rep_func */
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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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struct ib_wc rep_send_wcs[RPCRDMA_POLLSIZE];
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struct ib_wc rep_recv_wcs[RPCRDMA_POLLSIZE];
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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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/*
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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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/* temporary static scatter/gather max */
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#define RPCRDMA_MAX_DATA_SEGS (64) /* max scatter/gather */
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#define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
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#define MAX_RPCRDMAHDR (\
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/* max supported RPC/RDMA header */ \
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sizeof(struct rpcrdma_msg) + (2 * sizeof(u32)) + \
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(sizeof(struct rpcrdma_read_chunk) * RPCRDMA_MAX_SEGS) + sizeof(u32))
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struct rpcrdma_buffer;
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struct rpcrdma_rep {
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unsigned int rr_len; /* actual received reply length */
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struct rpcrdma_buffer *rr_buffer; /* home base for this structure */
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struct rpc_xprt *rr_xprt; /* needed for request/reply matching */
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void (*rr_func)(struct rpcrdma_rep *);/* called by tasklet in softint */
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struct list_head rr_list; /* tasklet list */
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struct ib_sge rr_iov; /* for posting */
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struct ib_mr *rr_handle; /* handle for mem in rr_iov */
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char rr_base[MAX_RPCRDMAHDR]; /* minimal inline receive buffer */
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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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union { /* chunk memory handles */
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struct ib_mr *rl_mr; /* if registered directly */
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struct rpcrdma_mw { /* if registered from region */
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union {
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struct ib_fmr *fmr;
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struct {
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struct ib_fast_reg_page_list *fr_pgl;
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struct ib_mr *fr_mr;
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enum { FRMR_IS_INVALID, FRMR_IS_VALID } state;
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} frmr;
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} r;
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struct list_head mw_list;
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} *rl_mw;
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} mr_chunk;
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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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struct rpcrdma_req {
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size_t rl_size; /* actual length of buffer */
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unsigned int rl_niovs; /* 0, 2 or 4 */
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unsigned int rl_nchunks; /* non-zero if chunks */
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unsigned int rl_connect_cookie; /* retry detection */
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struct rpcrdma_buffer *rl_buffer; /* home base for this structure */
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struct rpcrdma_rep *rl_reply;/* holder for reply buffer */
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struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];/* chunk segments */
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struct ib_sge rl_send_iov[4]; /* for active requests */
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struct ib_sge rl_iov; /* for posting */
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struct ib_mr *rl_handle; /* handle for mem in rl_iov */
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char rl_base[MAX_RPCRDMAHDR]; /* start of actual buffer */
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__u32 rl_xdr_buf[0]; /* start of returned rpc rq_buffer */
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};
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#define rpcr_to_rdmar(r) \
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container_of((r)->rq_buffer, struct rpcrdma_req, rl_xdr_buf[0])
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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; /* protects indexes */
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atomic_t rb_credits; /* most recent server credits */
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int rb_max_requests;/* client max requests */
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struct list_head rb_mws; /* optional memory windows/fmrs/frmrs */
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int rb_send_index;
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struct rpcrdma_req **rb_send_bufs;
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int rb_recv_index;
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struct rpcrdma_rep **rb_recv_bufs;
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char *rb_pool;
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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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};
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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 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 rdma_connect;
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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, 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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int 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 *,
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struct rpcrdma_rep *);
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/*
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* Buffer calls - xprtrdma/verbs.c
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*/
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int rpcrdma_buffer_create(struct rpcrdma_buffer *, struct rpcrdma_ep *,
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struct rpcrdma_ia *,
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struct rpcrdma_create_data_internal *);
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void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
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struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
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void rpcrdma_buffer_put(struct rpcrdma_req *);
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void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
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void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
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int rpcrdma_register_internal(struct rpcrdma_ia *, void *, int,
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struct ib_mr **, struct ib_sge *);
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int rpcrdma_deregister_internal(struct rpcrdma_ia *,
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struct ib_mr *, struct ib_sge *);
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int rpcrdma_register_external(struct rpcrdma_mr_seg *,
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int, int, struct rpcrdma_xprt *);
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int rpcrdma_deregister_external(struct rpcrdma_mr_seg *,
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struct rpcrdma_xprt *);
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/*
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* RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
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*/
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void rpcrdma_connect_worker(struct work_struct *);
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void rpcrdma_conn_func(struct rpcrdma_ep *);
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void rpcrdma_reply_handler(struct rpcrdma_rep *);
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/*
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* RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
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*/
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int rpcrdma_marshal_req(struct rpc_rqst *);
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/* Temporary NFS request map cache. Created in svc_rdma.c */
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extern struct kmem_cache *svc_rdma_map_cachep;
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/* WR context cache. Created in svc_rdma.c */
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extern struct kmem_cache *svc_rdma_ctxt_cachep;
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/* Workqueue created in svc_rdma.c */
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extern struct workqueue_struct *svc_rdma_wq;
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#endif /* _LINUX_SUNRPC_XPRT_RDMA_H */
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