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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 svc_rdma_op_ctxt *read_hdr;
 81         struct svc_rdma_fastreg_mr *frmr;
 82         int hdr_count;
 83         struct xdr_buf arg;
 84         struct ib_cqe cqe;
 85         struct ib_cqe reg_cqe;
 86         struct ib_cqe inv_cqe;
 87         u32 byte_len;
 88         u32 position;
 89         struct svcxprt_rdma *xprt;
 90         unsigned long flags;
 91         enum dma_data_direction direction;
 92         int count;
 93         unsigned int mapped_sges;
 94         struct ib_send_wr send_wr;
 95         struct ib_sge sge[1 + RPCRDMA_MAX_INLINE_THRESH / PAGE_SIZE];
 96         struct page *pages[RPCSVC_MAXPAGES];
 97 };
 98 
 99 struct svc_rdma_fastreg_mr {
100         struct ib_mr *mr;
101         struct scatterlist *sg;
102         int sg_nents;
103         unsigned long access_flags;
104         enum dma_data_direction direction;
105         struct list_head frmr_list;
106 };
107 
108 #define RDMACTXT_F_LAST_CTXT    2
109 
110 #define SVCRDMA_DEVCAP_FAST_REG         1       /* fast mr registration */
111 #define SVCRDMA_DEVCAP_READ_W_INV       2       /* read w/ invalidate */
112 
113 struct svcxprt_rdma {
114         struct svc_xprt      sc_xprt;           /* SVC transport structure */
115         struct rdma_cm_id    *sc_cm_id;         /* RDMA connection id */
116         struct list_head     sc_accept_q;       /* Conn. waiting accept */
117         int                  sc_ord;            /* RDMA read limit */
118         int                  sc_max_sge;
119         int                  sc_max_sge_rd;     /* max sge for read target */
120         bool                 sc_snd_w_inv;      /* OK to use Send With Invalidate */
121 
122         atomic_t             sc_sq_avail;       /* SQEs ready to be consumed */
123         unsigned int         sc_sq_depth;       /* Depth of SQ */
124         unsigned int         sc_rq_depth;       /* Depth of RQ */
125         __be32               sc_fc_credits;     /* Forward credits */
126         u32                  sc_max_requests;   /* Max requests */
127         u32                  sc_max_bc_requests;/* Backward credits */
128         int                  sc_max_req_size;   /* Size of each RQ WR buf */
129         u8                   sc_port_num;
130 
131         struct ib_pd         *sc_pd;
132 
133         spinlock_t           sc_ctxt_lock;
134         struct list_head     sc_ctxts;
135         int                  sc_ctxt_used;
136         spinlock_t           sc_rw_ctxt_lock;
137         struct list_head     sc_rw_ctxts;
138 
139         struct list_head     sc_rq_dto_q;
140         spinlock_t           sc_rq_dto_lock;
141         struct ib_qp         *sc_qp;
142         struct ib_cq         *sc_rq_cq;
143         struct ib_cq         *sc_sq_cq;
144         int                  (*sc_reader)(struct svcxprt_rdma *,
145                                           struct svc_rqst *,
146                                           struct svc_rdma_op_ctxt *,
147                                           int *, u32 *, u32, u32, u64, bool);
148         u32                  sc_dev_caps;       /* distilled device caps */
149         unsigned int         sc_frmr_pg_list_len;
150         struct list_head     sc_frmr_q;
151         spinlock_t           sc_frmr_q_lock;
152 
153         spinlock_t           sc_lock;           /* transport lock */
154 
155         wait_queue_head_t    sc_send_wait;      /* SQ exhaustion waitlist */
156         unsigned long        sc_flags;
157         struct list_head     sc_read_complete_q;
158         struct work_struct   sc_work;
159 };
160 /* sc_flags */
161 #define RDMAXPRT_CONN_PENDING   3
162 
163 #define RPCRDMA_LISTEN_BACKLOG  10
164 /* The default ORD value is based on two outstanding full-size writes with a
165  * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ.  */
166 #define RPCRDMA_ORD             (64/4)
167 #define RPCRDMA_MAX_REQUESTS    32
168 
169 /* Typical ULP usage of BC requests is NFSv4.1 backchannel. Our
170  * current NFSv4.1 implementation supports one backchannel slot.
171  */
172 #define RPCRDMA_MAX_BC_REQUESTS 2
173 
174 #define RPCSVC_MAXPAYLOAD_RDMA  RPCSVC_MAXPAYLOAD
175 
176 /* Track DMA maps for this transport and context */
177 static inline void svc_rdma_count_mappings(struct svcxprt_rdma *rdma,
178                                            struct svc_rdma_op_ctxt *ctxt)
179 {
180         ctxt->mapped_sges++;
181 }
182 
183 /* svc_rdma_backchannel.c */
184 extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
185                                     __be32 *rdma_resp,
186                                     struct xdr_buf *rcvbuf);
187 
188 /* svc_rdma_marshal.c */
189 extern int svc_rdma_xdr_decode_req(struct xdr_buf *);
190 
191 /* svc_rdma_recvfrom.c */
192 extern int svc_rdma_recvfrom(struct svc_rqst *);
193 extern int rdma_read_chunk_lcl(struct svcxprt_rdma *, struct svc_rqst *,
194                                struct svc_rdma_op_ctxt *, int *, u32 *,
195                                u32, u32, u64, bool);
196 extern int rdma_read_chunk_frmr(struct svcxprt_rdma *, struct svc_rqst *,
197                                 struct svc_rdma_op_ctxt *, int *, u32 *,
198                                 u32, u32, u64, bool);
199 
200 /* svc_rdma_rw.c */
201 extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
202 extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
203                                      __be32 *wr_ch, struct xdr_buf *xdr);
204 extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
205                                      __be32 *rp_ch, bool writelist,
206                                      struct xdr_buf *xdr);
207 
208 /* svc_rdma_sendto.c */
209 extern int svc_rdma_map_reply_hdr(struct svcxprt_rdma *rdma,
210                                   struct svc_rdma_op_ctxt *ctxt,
211                                   __be32 *rdma_resp, unsigned int len);
212 extern int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma,
213                                  struct svc_rdma_op_ctxt *ctxt,
214                                  int num_sge, u32 inv_rkey);
215 extern int svc_rdma_sendto(struct svc_rqst *);
216 
217 /* svc_rdma_transport.c */
218 extern void svc_rdma_wc_send(struct ib_cq *, struct ib_wc *);
219 extern void svc_rdma_wc_reg(struct ib_cq *, struct ib_wc *);
220 extern void svc_rdma_wc_read(struct ib_cq *, struct ib_wc *);
221 extern void svc_rdma_wc_inv(struct ib_cq *, struct ib_wc *);
222 extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
223 extern int svc_rdma_post_recv(struct svcxprt_rdma *, gfp_t);
224 extern int svc_rdma_repost_recv(struct svcxprt_rdma *, gfp_t);
225 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
226 extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
227 extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
228 extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
229 extern struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *);
230 extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
231                               struct svc_rdma_fastreg_mr *);
232 extern void svc_sq_reap(struct svcxprt_rdma *);
233 extern void svc_rq_reap(struct svcxprt_rdma *);
234 extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
235 
236 extern struct svc_xprt_class svc_rdma_class;
237 #ifdef CONFIG_SUNRPC_BACKCHANNEL
238 extern struct svc_xprt_class svc_rdma_bc_class;
239 #endif
240 
241 /* svc_rdma.c */
242 extern struct workqueue_struct *svc_rdma_wq;
243 extern int svc_rdma_init(void);
244 extern void svc_rdma_cleanup(void);
245 
246 #endif
247 

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