273 lines
9.9 KiB
C
273 lines
9.9 KiB
C
/*
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* Copyright (c) 2005-2006 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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* Author: Tom Tucker <tom@opengridcomputing.com>
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*/
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#ifndef SVC_RDMA_H
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#define SVC_RDMA_H
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/rpc_rdma.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#define SVCRDMA_DEBUG
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/* RPC/RDMA parameters and stats */
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extern unsigned int svcrdma_ord;
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extern unsigned int svcrdma_max_requests;
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extern unsigned int svcrdma_max_bc_requests;
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extern unsigned int svcrdma_max_req_size;
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extern atomic_t rdma_stat_recv;
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extern atomic_t rdma_stat_read;
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extern atomic_t rdma_stat_write;
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extern atomic_t rdma_stat_sq_starve;
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extern atomic_t rdma_stat_rq_starve;
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extern atomic_t rdma_stat_rq_poll;
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extern atomic_t rdma_stat_rq_prod;
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extern atomic_t rdma_stat_sq_poll;
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extern atomic_t rdma_stat_sq_prod;
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/*
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* Contexts are built when an RDMA request is created and are a
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* record of the resources that can be recovered when the request
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* completes.
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*/
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struct svc_rdma_op_ctxt {
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struct list_head free;
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struct svc_rdma_op_ctxt *read_hdr;
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struct svc_rdma_fastreg_mr *frmr;
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int hdr_count;
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struct xdr_buf arg;
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struct ib_cqe cqe;
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struct ib_cqe reg_cqe;
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struct ib_cqe inv_cqe;
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struct list_head dto_q;
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u32 byte_len;
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u32 position;
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struct svcxprt_rdma *xprt;
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unsigned long flags;
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enum dma_data_direction direction;
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int count;
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unsigned int mapped_sges;
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struct ib_sge sge[RPCSVC_MAXPAGES];
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struct page *pages[RPCSVC_MAXPAGES];
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};
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/*
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* NFS_ requests are mapped on the client side by the chunk lists in
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* the RPCRDMA header. During the fetching of the RPC from the client
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* and the writing of the reply to the client, the memory in the
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* client and the memory in the server must be mapped as contiguous
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* vaddr/len for access by the hardware. These data strucures keep
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* these mappings.
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*
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* For an RDMA_WRITE, the 'sge' maps the RPC REPLY. For RDMA_READ, the
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* 'sge' in the svc_rdma_req_map maps the server side RPC reply and the
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* 'ch' field maps the read-list of the RPCRDMA header to the 'sge'
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* mapping of the reply.
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*/
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struct svc_rdma_chunk_sge {
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int start; /* sge no for this chunk */
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int count; /* sge count for this chunk */
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};
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struct svc_rdma_fastreg_mr {
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struct ib_mr *mr;
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struct scatterlist *sg;
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int sg_nents;
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unsigned long access_flags;
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enum dma_data_direction direction;
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struct list_head frmr_list;
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};
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struct svc_rdma_req_map {
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struct list_head free;
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unsigned long count;
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union {
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struct kvec sge[RPCSVC_MAXPAGES];
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struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
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unsigned long lkey[RPCSVC_MAXPAGES];
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};
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};
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#define RDMACTXT_F_LAST_CTXT 2
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#define SVCRDMA_DEVCAP_FAST_REG 1 /* fast mr registration */
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#define SVCRDMA_DEVCAP_READ_W_INV 2 /* read w/ invalidate */
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struct svcxprt_rdma {
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struct svc_xprt sc_xprt; /* SVC transport structure */
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struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
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struct list_head sc_accept_q; /* Conn. waiting accept */
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int sc_ord; /* RDMA read limit */
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int sc_max_sge;
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int sc_max_sge_rd; /* max sge for read target */
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bool sc_snd_w_inv; /* OK to use Send With Invalidate */
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atomic_t sc_sq_avail; /* SQEs ready to be consumed */
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unsigned int sc_sq_depth; /* Depth of SQ */
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unsigned int sc_rq_depth; /* Depth of RQ */
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u32 sc_max_requests; /* Forward credits */
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u32 sc_max_bc_requests;/* Backward credits */
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int sc_max_req_size; /* Size of each RQ WR buf */
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struct ib_pd *sc_pd;
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spinlock_t sc_ctxt_lock;
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struct list_head sc_ctxts;
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int sc_ctxt_used;
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spinlock_t sc_map_lock;
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struct list_head sc_maps;
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struct list_head sc_rq_dto_q;
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spinlock_t sc_rq_dto_lock;
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struct ib_qp *sc_qp;
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struct ib_cq *sc_rq_cq;
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struct ib_cq *sc_sq_cq;
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int (*sc_reader)(struct svcxprt_rdma *,
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struct svc_rqst *,
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struct svc_rdma_op_ctxt *,
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int *, u32 *, u32, u32, u64, bool);
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u32 sc_dev_caps; /* distilled device caps */
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unsigned int sc_frmr_pg_list_len;
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struct list_head sc_frmr_q;
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spinlock_t sc_frmr_q_lock;
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spinlock_t sc_lock; /* transport lock */
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wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
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unsigned long sc_flags;
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struct list_head sc_dto_q; /* DTO tasklet I/O pending Q */
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struct list_head sc_read_complete_q;
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struct work_struct sc_work;
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};
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/* sc_flags */
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#define RDMAXPRT_CONN_PENDING 3
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#define RPCRDMA_LISTEN_BACKLOG 10
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/* The default ORD value is based on two outstanding full-size writes with a
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* page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ. */
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#define RPCRDMA_ORD (64/4)
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#define RPCRDMA_SQ_DEPTH_MULT 8
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#define RPCRDMA_MAX_REQUESTS 32
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#define RPCRDMA_MAX_REQ_SIZE 4096
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/* Typical ULP usage of BC requests is NFSv4.1 backchannel. Our
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* current NFSv4.1 implementation supports one backchannel slot.
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*/
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#define RPCRDMA_MAX_BC_REQUESTS 2
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#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
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/* Track DMA maps for this transport and context */
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static inline void svc_rdma_count_mappings(struct svcxprt_rdma *rdma,
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struct svc_rdma_op_ctxt *ctxt)
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{
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ctxt->mapped_sges++;
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}
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/* svc_rdma_backchannel.c */
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extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
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struct rpcrdma_msg *rmsgp,
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struct xdr_buf *rcvbuf);
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/* svc_rdma_marshal.c */
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extern int svc_rdma_xdr_decode_req(struct xdr_buf *);
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extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
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struct rpcrdma_msg *,
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enum rpcrdma_errcode, __be32 *);
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extern void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *, int);
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extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
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extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
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__be32, __be64, u32);
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extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
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struct rpcrdma_msg *,
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struct rpcrdma_msg *,
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enum rpcrdma_proc);
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extern int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *);
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/* svc_rdma_recvfrom.c */
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extern int svc_rdma_recvfrom(struct svc_rqst *);
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extern int rdma_read_chunk_lcl(struct svcxprt_rdma *, struct svc_rqst *,
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struct svc_rdma_op_ctxt *, int *, u32 *,
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u32, u32, u64, bool);
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extern int rdma_read_chunk_frmr(struct svcxprt_rdma *, struct svc_rqst *,
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struct svc_rdma_op_ctxt *, int *, u32 *,
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u32, u32, u64, bool);
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/* svc_rdma_sendto.c */
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extern int svc_rdma_map_xdr(struct svcxprt_rdma *, struct xdr_buf *,
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struct svc_rdma_req_map *, bool);
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extern int svc_rdma_sendto(struct svc_rqst *);
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extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
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int);
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/* svc_rdma_transport.c */
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extern void svc_rdma_wc_send(struct ib_cq *, struct ib_wc *);
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extern void svc_rdma_wc_write(struct ib_cq *, struct ib_wc *);
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extern void svc_rdma_wc_reg(struct ib_cq *, struct ib_wc *);
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extern void svc_rdma_wc_read(struct ib_cq *, struct ib_wc *);
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extern void svc_rdma_wc_inv(struct ib_cq *, struct ib_wc *);
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extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
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extern int svc_rdma_post_recv(struct svcxprt_rdma *, gfp_t);
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extern int svc_rdma_repost_recv(struct svcxprt_rdma *, gfp_t);
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extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
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extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
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extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
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extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
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extern struct svc_rdma_req_map *svc_rdma_get_req_map(struct svcxprt_rdma *);
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extern void svc_rdma_put_req_map(struct svcxprt_rdma *,
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struct svc_rdma_req_map *);
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extern struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *);
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extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
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struct svc_rdma_fastreg_mr *);
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extern void svc_sq_reap(struct svcxprt_rdma *);
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extern void svc_rq_reap(struct svcxprt_rdma *);
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extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
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extern struct svc_xprt_class svc_rdma_class;
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#ifdef CONFIG_SUNRPC_BACKCHANNEL
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extern struct svc_xprt_class svc_rdma_bc_class;
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#endif
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/* svc_rdma.c */
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extern struct workqueue_struct *svc_rdma_wq;
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extern int svc_rdma_init(void);
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extern void svc_rdma_cleanup(void);
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#endif
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