linux/net/sunrpc/xprtrdma/svc_rdma.c
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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#include <linux/slab.h>
  43#include <linux/fs.h>
  44#include <linux/sysctl.h>
  45#include <linux/workqueue.h>
  46#include <linux/sunrpc/clnt.h>
  47#include <linux/sunrpc/sched.h>
  48#include <linux/sunrpc/svc_rdma.h>
  49#include "xprt_rdma.h"
  50
  51#define RPCDBG_FACILITY RPCDBG_SVCXPRT
  52
  53/* RPC/RDMA parameters */
  54unsigned int svcrdma_ord = RPCRDMA_ORD;
  55static unsigned int min_ord = 1;
  56static unsigned int max_ord = 4096;
  57unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
  58unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
  59static unsigned int min_max_requests = 4;
  60static unsigned int max_max_requests = 16384;
  61unsigned int svcrdma_max_req_size = RPCRDMA_DEF_INLINE_THRESH;
  62static unsigned int min_max_inline = RPCRDMA_DEF_INLINE_THRESH;
  63static unsigned int max_max_inline = RPCRDMA_MAX_INLINE_THRESH;
  64
  65atomic_t rdma_stat_recv;
  66atomic_t rdma_stat_read;
  67atomic_t rdma_stat_write;
  68atomic_t rdma_stat_sq_starve;
  69atomic_t rdma_stat_rq_starve;
  70atomic_t rdma_stat_rq_poll;
  71atomic_t rdma_stat_rq_prod;
  72atomic_t rdma_stat_sq_poll;
  73atomic_t rdma_stat_sq_prod;
  74
  75struct workqueue_struct *svc_rdma_wq;
  76
  77/*
  78 * This function implements reading and resetting an atomic_t stat
  79 * variable through read/write to a proc file. Any write to the file
  80 * resets the associated statistic to zero. Any read returns it's
  81 * current value.
  82 */
  83static int read_reset_stat(struct ctl_table *table, int write,
  84                           void __user *buffer, size_t *lenp,
  85                           loff_t *ppos)
  86{
  87        atomic_t *stat = (atomic_t *)table->data;
  88
  89        if (!stat)
  90                return -EINVAL;
  91
  92        if (write)
  93                atomic_set(stat, 0);
  94        else {
  95                char str_buf[32];
  96                char *data;
  97                int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
  98                if (len >= 32)
  99                        return -EFAULT;
 100                len = strlen(str_buf);
 101                if (*ppos > len) {
 102                        *lenp = 0;
 103                        return 0;
 104                }
 105                data = &str_buf[*ppos];
 106                len -= *ppos;
 107                if (len > *lenp)
 108                        len = *lenp;
 109                if (len && copy_to_user(buffer, str_buf, len))
 110                        return -EFAULT;
 111                *lenp = len;
 112                *ppos += len;
 113        }
 114        return 0;
 115}
 116
 117static struct ctl_table_header *svcrdma_table_header;
 118static struct ctl_table svcrdma_parm_table[] = {
 119        {
 120                .procname       = "max_requests",
 121                .data           = &svcrdma_max_requests,
 122                .maxlen         = sizeof(unsigned int),
 123                .mode           = 0644,
 124                .proc_handler   = proc_dointvec_minmax,
 125                .extra1         = &min_max_requests,
 126                .extra2         = &max_max_requests
 127        },
 128        {
 129                .procname       = "max_req_size",
 130                .data           = &svcrdma_max_req_size,
 131                .maxlen         = sizeof(unsigned int),
 132                .mode           = 0644,
 133                .proc_handler   = proc_dointvec_minmax,
 134                .extra1         = &min_max_inline,
 135                .extra2         = &max_max_inline
 136        },
 137        {
 138                .procname       = "max_outbound_read_requests",
 139                .data           = &svcrdma_ord,
 140                .maxlen         = sizeof(unsigned int),
 141                .mode           = 0644,
 142                .proc_handler   = proc_dointvec_minmax,
 143                .extra1         = &min_ord,
 144                .extra2         = &max_ord,
 145        },
 146
 147        {
 148                .procname       = "rdma_stat_read",
 149                .data           = &rdma_stat_read,
 150                .maxlen         = sizeof(atomic_t),
 151                .mode           = 0644,
 152                .proc_handler   = read_reset_stat,
 153        },
 154        {
 155                .procname       = "rdma_stat_recv",
 156                .data           = &rdma_stat_recv,
 157                .maxlen         = sizeof(atomic_t),
 158                .mode           = 0644,
 159                .proc_handler   = read_reset_stat,
 160        },
 161        {
 162                .procname       = "rdma_stat_write",
 163                .data           = &rdma_stat_write,
 164                .maxlen         = sizeof(atomic_t),
 165                .mode           = 0644,
 166                .proc_handler   = read_reset_stat,
 167        },
 168        {
 169                .procname       = "rdma_stat_sq_starve",
 170                .data           = &rdma_stat_sq_starve,
 171                .maxlen         = sizeof(atomic_t),
 172                .mode           = 0644,
 173                .proc_handler   = read_reset_stat,
 174        },
 175        {
 176                .procname       = "rdma_stat_rq_starve",
 177                .data           = &rdma_stat_rq_starve,
 178                .maxlen         = sizeof(atomic_t),
 179                .mode           = 0644,
 180                .proc_handler   = read_reset_stat,
 181        },
 182        {
 183                .procname       = "rdma_stat_rq_poll",
 184                .data           = &rdma_stat_rq_poll,
 185                .maxlen         = sizeof(atomic_t),
 186                .mode           = 0644,
 187                .proc_handler   = read_reset_stat,
 188        },
 189        {
 190                .procname       = "rdma_stat_rq_prod",
 191                .data           = &rdma_stat_rq_prod,
 192                .maxlen         = sizeof(atomic_t),
 193                .mode           = 0644,
 194                .proc_handler   = read_reset_stat,
 195        },
 196        {
 197                .procname       = "rdma_stat_sq_poll",
 198                .data           = &rdma_stat_sq_poll,
 199                .maxlen         = sizeof(atomic_t),
 200                .mode           = 0644,
 201                .proc_handler   = read_reset_stat,
 202        },
 203        {
 204                .procname       = "rdma_stat_sq_prod",
 205                .data           = &rdma_stat_sq_prod,
 206                .maxlen         = sizeof(atomic_t),
 207                .mode           = 0644,
 208                .proc_handler   = read_reset_stat,
 209        },
 210        { },
 211};
 212
 213static struct ctl_table svcrdma_table[] = {
 214        {
 215                .procname       = "svc_rdma",
 216                .mode           = 0555,
 217                .child          = svcrdma_parm_table
 218        },
 219        { },
 220};
 221
 222static struct ctl_table svcrdma_root_table[] = {
 223        {
 224                .procname       = "sunrpc",
 225                .mode           = 0555,
 226                .child          = svcrdma_table
 227        },
 228        { },
 229};
 230
 231void svc_rdma_cleanup(void)
 232{
 233        dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
 234        destroy_workqueue(svc_rdma_wq);
 235        if (svcrdma_table_header) {
 236                unregister_sysctl_table(svcrdma_table_header);
 237                svcrdma_table_header = NULL;
 238        }
 239#if defined(CONFIG_SUNRPC_BACKCHANNEL)
 240        svc_unreg_xprt_class(&svc_rdma_bc_class);
 241#endif
 242        svc_unreg_xprt_class(&svc_rdma_class);
 243}
 244
 245int svc_rdma_init(void)
 246{
 247        dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
 248        dprintk("\tsvcrdma_ord      : %d\n", svcrdma_ord);
 249        dprintk("\tmax_requests     : %u\n", svcrdma_max_requests);
 250        dprintk("\tmax_bc_requests  : %u\n", svcrdma_max_bc_requests);
 251        dprintk("\tmax_inline       : %d\n", svcrdma_max_req_size);
 252
 253        svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
 254        if (!svc_rdma_wq)
 255                return -ENOMEM;
 256
 257        if (!svcrdma_table_header)
 258                svcrdma_table_header =
 259                        register_sysctl_table(svcrdma_root_table);
 260
 261        /* Register RDMA with the SVC transport switch */
 262        svc_reg_xprt_class(&svc_rdma_class);
 263#if defined(CONFIG_SUNRPC_BACKCHANNEL)
 264        svc_reg_xprt_class(&svc_rdma_bc_class);
 265#endif
 266        return 0;
 267}
 268