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240 lines
8.8 KiB
240 lines
8.8 KiB
/* |
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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_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 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 list_head dto_q; |
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enum ib_wr_opcode wr_op; |
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enum ib_wc_status wc_status; |
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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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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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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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int sc_sq_depth; /* Depth of SQ */ |
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atomic_t sc_sq_count; /* Number of SQ WR on queue */ |
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int sc_max_requests; /* Depth of RQ */ |
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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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atomic_t sc_dma_used; |
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atomic_t sc_ctxt_used; |
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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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struct ib_mr *sc_phys_mr; /* MR for server memory */ |
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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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u32 sc_dma_lkey; /* local dma key */ |
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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_RQ_PENDING 1 |
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#define RDMAXPRT_SQ_PENDING 2 |
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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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#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD |
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/* svc_rdma_marshal.c */ |
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extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg **, struct svc_rqst *); |
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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_sendto(struct svc_rqst *); |
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extern struct rpcrdma_read_chunk * |
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svc_rdma_get_read_chunk(struct rpcrdma_msg *); |
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/* svc_rdma_transport.c */ |
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extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *); |
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extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *, |
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enum rpcrdma_errcode); |
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extern int svc_rdma_post_recv(struct svcxprt_rdma *); |
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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(void); |
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extern void svc_rdma_put_req_map(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 int svc_rdma_init(void); |
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extern void svc_rdma_cleanup(void); |
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#endif
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