root/include/linux/sunrpc/svc_rdma.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
   2 /*
   3  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the BSD-type
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  *      Redistributions of source code must retain the above copyright
  16  *      notice, this list of conditions and the following disclaimer.
  17  *
  18  *      Redistributions in binary form must reproduce the above
  19  *      copyright notice, this list of conditions and the following
  20  *      disclaimer in the documentation and/or other materials provided
  21  *      with the distribution.
  22  *
  23  *      Neither the name of the Network Appliance, Inc. nor the names of
  24  *      its contributors may be used to endorse or promote products
  25  *      derived from this software without specific prior written
  26  *      permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Author: Tom Tucker <tom@opengridcomputing.com>
  41  */
  42 
  43 #ifndef SVC_RDMA_H
  44 #define SVC_RDMA_H
  45 #include <linux/llist.h>
  46 #include <linux/sunrpc/xdr.h>
  47 #include <linux/sunrpc/svcsock.h>
  48 #include <linux/sunrpc/rpc_rdma.h>
  49 #include <rdma/ib_verbs.h>
  50 #include <rdma/rdma_cm.h>
  51 #define SVCRDMA_DEBUG
  52 
  53 /* Default and maximum inline threshold sizes */
  54 enum {
  55         RPCRDMA_DEF_INLINE_THRESH = 4096,
  56         RPCRDMA_MAX_INLINE_THRESH = 65536
  57 };
  58 
  59 /* RPC/RDMA parameters and stats */
  60 extern unsigned int svcrdma_ord;
  61 extern unsigned int svcrdma_max_requests;
  62 extern unsigned int svcrdma_max_bc_requests;
  63 extern unsigned int svcrdma_max_req_size;
  64 
  65 extern atomic_t rdma_stat_recv;
  66 extern atomic_t rdma_stat_read;
  67 extern atomic_t rdma_stat_write;
  68 extern atomic_t rdma_stat_sq_starve;
  69 extern atomic_t rdma_stat_rq_starve;
  70 extern atomic_t rdma_stat_rq_poll;
  71 extern atomic_t rdma_stat_rq_prod;
  72 extern atomic_t rdma_stat_sq_poll;
  73 extern atomic_t rdma_stat_sq_prod;
  74 
  75 struct svcxprt_rdma {
  76         struct svc_xprt      sc_xprt;           /* SVC transport structure */
  77         struct rdma_cm_id    *sc_cm_id;         /* RDMA connection id */
  78         struct list_head     sc_accept_q;       /* Conn. waiting accept */
  79         int                  sc_ord;            /* RDMA read limit */
  80         int                  sc_max_send_sges;
  81         bool                 sc_snd_w_inv;      /* OK to use Send With Invalidate */
  82 
  83         atomic_t             sc_sq_avail;       /* SQEs ready to be consumed */
  84         unsigned int         sc_sq_depth;       /* Depth of SQ */
  85         __be32               sc_fc_credits;     /* Forward credits */
  86         u32                  sc_max_requests;   /* Max requests */
  87         u32                  sc_max_bc_requests;/* Backward credits */
  88         int                  sc_max_req_size;   /* Size of each RQ WR buf */
  89         u8                   sc_port_num;
  90 
  91         struct ib_pd         *sc_pd;
  92 
  93         spinlock_t           sc_send_lock;
  94         struct list_head     sc_send_ctxts;
  95         spinlock_t           sc_rw_ctxt_lock;
  96         struct list_head     sc_rw_ctxts;
  97 
  98         struct list_head     sc_rq_dto_q;
  99         spinlock_t           sc_rq_dto_lock;
 100         struct ib_qp         *sc_qp;
 101         struct ib_cq         *sc_rq_cq;
 102         struct ib_cq         *sc_sq_cq;
 103 
 104         spinlock_t           sc_lock;           /* transport lock */
 105 
 106         wait_queue_head_t    sc_send_wait;      /* SQ exhaustion waitlist */
 107         unsigned long        sc_flags;
 108         struct list_head     sc_read_complete_q;
 109         struct work_struct   sc_work;
 110 
 111         struct llist_head    sc_recv_ctxts;
 112 };
 113 /* sc_flags */
 114 #define RDMAXPRT_CONN_PENDING   3
 115 
 116 /*
 117  * Default connection parameters
 118  */
 119 enum {
 120         RPCRDMA_LISTEN_BACKLOG  = 10,
 121         RPCRDMA_MAX_REQUESTS    = 64,
 122         RPCRDMA_MAX_BC_REQUESTS = 2,
 123 };
 124 
 125 #define RPCSVC_MAXPAYLOAD_RDMA  RPCSVC_MAXPAYLOAD
 126 
 127 struct svc_rdma_recv_ctxt {
 128         struct llist_node       rc_node;
 129         struct list_head        rc_list;
 130         struct ib_recv_wr       rc_recv_wr;
 131         struct ib_cqe           rc_cqe;
 132         struct ib_sge           rc_recv_sge;
 133         void                    *rc_recv_buf;
 134         struct xdr_buf          rc_arg;
 135         bool                    rc_temp;
 136         u32                     rc_byte_len;
 137         unsigned int            rc_page_count;
 138         unsigned int            rc_hdr_count;
 139         u32                     rc_inv_rkey;
 140         struct page             *rc_pages[RPCSVC_MAXPAGES];
 141 };
 142 
 143 struct svc_rdma_send_ctxt {
 144         struct list_head        sc_list;
 145         struct ib_send_wr       sc_send_wr;
 146         struct ib_cqe           sc_cqe;
 147         void                    *sc_xprt_buf;
 148         int                     sc_page_count;
 149         int                     sc_cur_sge_no;
 150         struct page             *sc_pages[RPCSVC_MAXPAGES];
 151         struct ib_sge           sc_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 void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
 161 extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
 162 extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
 163                                    struct svc_rdma_recv_ctxt *ctxt);
 164 extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
 165 extern void svc_rdma_release_rqst(struct svc_rqst *rqstp);
 166 extern int svc_rdma_recvfrom(struct svc_rqst *);
 167 
 168 /* svc_rdma_rw.c */
 169 extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
 170 extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
 171                                     struct svc_rqst *rqstp,
 172                                     struct svc_rdma_recv_ctxt *head, __be32 *p);
 173 extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
 174                                      __be32 *wr_ch, struct xdr_buf *xdr);
 175 extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
 176                                      __be32 *rp_ch, bool writelist,
 177                                      struct xdr_buf *xdr);
 178 
 179 /* svc_rdma_sendto.c */
 180 extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
 181 extern struct svc_rdma_send_ctxt *
 182                 svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
 183 extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
 184                                    struct svc_rdma_send_ctxt *ctxt);
 185 extern int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr);
 186 extern void svc_rdma_sync_reply_hdr(struct svcxprt_rdma *rdma,
 187                                     struct svc_rdma_send_ctxt *ctxt,
 188                                     unsigned int len);
 189 extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
 190                                   struct svc_rdma_send_ctxt *ctxt,
 191                                   struct xdr_buf *xdr, __be32 *wr_lst);
 192 extern int svc_rdma_sendto(struct svc_rqst *);
 193 
 194 /* svc_rdma_transport.c */
 195 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
 196 extern void svc_sq_reap(struct svcxprt_rdma *);
 197 extern void svc_rq_reap(struct svcxprt_rdma *);
 198 
 199 extern struct svc_xprt_class svc_rdma_class;
 200 #ifdef CONFIG_SUNRPC_BACKCHANNEL
 201 extern struct svc_xprt_class svc_rdma_bc_class;
 202 #endif
 203 
 204 /* svc_rdma.c */
 205 extern int svc_rdma_init(void);
 206 extern void svc_rdma_cleanup(void);
 207 
 208 #endif