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TOMOYO Linux Cross Reference
Linux/include/linux/sunrpc/svc_rdma.h

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  1 /*
  2  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
  3  *
  4  * This software is available to you under a choice of one of two
  5  * licenses.  You may choose to be licensed under the terms of the GNU
  6  * General Public License (GPL) Version 2, available from the file
  7  * COPYING in the main directory of this source tree, or the BSD-type
  8  * license below:
  9  *
 10  * Redistribution and use in source and binary forms, with or without
 11  * modification, are permitted provided that the following conditions
 12  * are met:
 13  *
 14  *      Redistributions of source code must retain the above copyright
 15  *      notice, this list of conditions and the following disclaimer.
 16  *
 17  *      Redistributions in binary form must reproduce the above
 18  *      copyright notice, this list of conditions and the following
 19  *      disclaimer in the documentation and/or other materials provided
 20  *      with the distribution.
 21  *
 22  *      Neither the name of the Network Appliance, Inc. nor the names of
 23  *      its contributors may be used to endorse or promote products
 24  *      derived from this software without specific prior written
 25  *      permission.
 26  *
 27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 31  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 32  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 33  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 37  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 38  *
 39  * Author: Tom Tucker <tom@opengridcomputing.com>
 40  */
 41 
 42 #ifndef SVC_RDMA_H
 43 #define SVC_RDMA_H
 44 #include <linux/sunrpc/xdr.h>
 45 #include <linux/sunrpc/svcsock.h>
 46 #include <linux/sunrpc/rpc_rdma.h>
 47 #include <rdma/ib_verbs.h>
 48 #include <rdma/rdma_cm.h>
 49 #define SVCRDMA_DEBUG
 50 
 51 /* Default and maximum inline threshold sizes */
 52 enum {
 53         RPCRDMA_DEF_INLINE_THRESH = 4096,
 54         RPCRDMA_MAX_INLINE_THRESH = 65536
 55 };
 56 
 57 /* RPC/RDMA parameters and stats */
 58 extern unsigned int svcrdma_ord;
 59 extern unsigned int svcrdma_max_requests;
 60 extern unsigned int svcrdma_max_bc_requests;
 61 extern unsigned int svcrdma_max_req_size;
 62 
 63 extern atomic_t rdma_stat_recv;
 64 extern atomic_t rdma_stat_read;
 65 extern atomic_t rdma_stat_write;
 66 extern atomic_t rdma_stat_sq_starve;
 67 extern atomic_t rdma_stat_rq_starve;
 68 extern atomic_t rdma_stat_rq_poll;
 69 extern atomic_t rdma_stat_rq_prod;
 70 extern atomic_t rdma_stat_sq_poll;
 71 extern atomic_t rdma_stat_sq_prod;
 72 
 73 /*
 74  * Contexts are built when an RDMA request is created and are a
 75  * record of the resources that can be recovered when the request
 76  * completes.
 77  */
 78 struct svc_rdma_op_ctxt {
 79         struct list_head list;
 80         struct xdr_buf arg;
 81         struct ib_cqe cqe;
 82         u32 byte_len;
 83         struct svcxprt_rdma *xprt;
 84         enum dma_data_direction direction;
 85         int count;
 86         unsigned int mapped_sges;
 87         int hdr_count;
 88         struct ib_send_wr send_wr;
 89         struct ib_sge sge[1 + RPCRDMA_MAX_INLINE_THRESH / PAGE_SIZE];
 90         struct page *pages[RPCSVC_MAXPAGES];
 91 };
 92 
 93 struct svcxprt_rdma {
 94         struct svc_xprt      sc_xprt;           /* SVC transport structure */
 95         struct rdma_cm_id    *sc_cm_id;         /* RDMA connection id */
 96         struct list_head     sc_accept_q;       /* Conn. waiting accept */
 97         int                  sc_ord;            /* RDMA read limit */
 98         int                  sc_max_sge;
 99         bool                 sc_snd_w_inv;      /* OK to use Send With Invalidate */
100 
101         atomic_t             sc_sq_avail;       /* SQEs ready to be consumed */
102         unsigned int         sc_sq_depth;       /* Depth of SQ */
103         unsigned int         sc_rq_depth;       /* Depth of RQ */
104         __be32               sc_fc_credits;     /* Forward credits */
105         u32                  sc_max_requests;   /* Max requests */
106         u32                  sc_max_bc_requests;/* Backward credits */
107         int                  sc_max_req_size;   /* Size of each RQ WR buf */
108         u8                   sc_port_num;
109 
110         struct ib_pd         *sc_pd;
111 
112         spinlock_t           sc_ctxt_lock;
113         struct list_head     sc_ctxts;
114         int                  sc_ctxt_used;
115         spinlock_t           sc_rw_ctxt_lock;
116         struct list_head     sc_rw_ctxts;
117 
118         struct list_head     sc_rq_dto_q;
119         spinlock_t           sc_rq_dto_lock;
120         struct ib_qp         *sc_qp;
121         struct ib_cq         *sc_rq_cq;
122         struct ib_cq         *sc_sq_cq;
123 
124         spinlock_t           sc_lock;           /* transport lock */
125 
126         wait_queue_head_t    sc_send_wait;      /* SQ exhaustion waitlist */
127         unsigned long        sc_flags;
128         struct list_head     sc_read_complete_q;
129         struct work_struct   sc_work;
130 };
131 /* sc_flags */
132 #define RDMAXPRT_CONN_PENDING   3
133 
134 #define RPCRDMA_LISTEN_BACKLOG  10
135 /* The default ORD value is based on two outstanding full-size writes with a
136  * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ.  */
137 #define RPCRDMA_ORD             (64/4)
138 #define RPCRDMA_MAX_REQUESTS    32
139 
140 /* Typical ULP usage of BC requests is NFSv4.1 backchannel. Our
141  * current NFSv4.1 implementation supports one backchannel slot.
142  */
143 #define RPCRDMA_MAX_BC_REQUESTS 2
144 
145 #define RPCSVC_MAXPAYLOAD_RDMA  RPCSVC_MAXPAYLOAD
146 
147 /* Track DMA maps for this transport and context */
148 static inline void svc_rdma_count_mappings(struct svcxprt_rdma *rdma,
149                                            struct svc_rdma_op_ctxt *ctxt)
150 {
151         ctxt->mapped_sges++;
152 }
153 
154 /* svc_rdma_backchannel.c */
155 extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
156                                     __be32 *rdma_resp,
157                                     struct xdr_buf *rcvbuf);
158 
159 /* svc_rdma_recvfrom.c */
160 extern int svc_rdma_recvfrom(struct svc_rqst *);
161 
162 /* svc_rdma_rw.c */
163 extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
164 extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
165                                     struct svc_rqst *rqstp,
166                                     struct svc_rdma_op_ctxt *head, __be32 *p);
167 extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
168                                      __be32 *wr_ch, struct xdr_buf *xdr);
169 extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
170                                      __be32 *rp_ch, bool writelist,
171                                      struct xdr_buf *xdr);
172 
173 /* svc_rdma_sendto.c */
174 extern int svc_rdma_map_reply_hdr(struct svcxprt_rdma *rdma,
175                                   struct svc_rdma_op_ctxt *ctxt,
176                                   __be32 *rdma_resp, unsigned int len);
177 extern int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma,
178                                  struct svc_rdma_op_ctxt *ctxt,
179                                  int num_sge, u32 inv_rkey);
180 extern int svc_rdma_sendto(struct svc_rqst *);
181 
182 /* svc_rdma_transport.c */
183 extern void svc_rdma_wc_send(struct ib_cq *, struct ib_wc *);
184 extern void svc_rdma_wc_reg(struct ib_cq *, struct ib_wc *);
185 extern void svc_rdma_wc_read(struct ib_cq *, struct ib_wc *);
186 extern void svc_rdma_wc_inv(struct ib_cq *, struct ib_wc *);
187 extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
188 extern int svc_rdma_post_recv(struct svcxprt_rdma *, gfp_t);
189 extern int svc_rdma_repost_recv(struct svcxprt_rdma *, gfp_t);
190 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
191 extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
192 extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
193 extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
194 extern void svc_sq_reap(struct svcxprt_rdma *);
195 extern void svc_rq_reap(struct svcxprt_rdma *);
196 extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
197 
198 extern struct svc_xprt_class svc_rdma_class;
199 #ifdef CONFIG_SUNRPC_BACKCHANNEL
200 extern struct svc_xprt_class svc_rdma_bc_class;
201 #endif
202 
203 /* svc_rdma.c */
204 extern struct workqueue_struct *svc_rdma_wq;
205 extern int svc_rdma_init(void);
206 extern void svc_rdma_cleanup(void);
207 
208 #endif
209 

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