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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 #include <linux/module.h>
  42 #include <linux/init.h>
  43 #include <linux/fs.h>
  44 #include <linux/sysctl.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/sched.h>
  47 #include <linux/sunrpc/svc_rdma.h>
  48
  49 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
  50
  51 /* RPC/RDMA parameters */
  52 unsigned int svcrdma_ord = RPCRDMA_ORD;
  53 static unsigned int min_ord = 1;
  54 static unsigned int max_ord = 4096;
  55 unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
  56 static unsigned int min_max_requests = 4;
  57 static unsigned int max_max_requests = 16384;
  58 unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
  59 static unsigned int min_max_inline = 4096;
  60 static unsigned int max_max_inline = 65536;
  61
  62 atomic_t rdma_stat_recv;
  63 atomic_t rdma_stat_read;
  64 atomic_t rdma_stat_write;
  65 atomic_t rdma_stat_sq_starve;
  66 atomic_t rdma_stat_rq_starve;
  67 atomic_t rdma_stat_rq_poll;
  68 atomic_t rdma_stat_rq_prod;
  69 atomic_t rdma_stat_sq_poll;
  70 atomic_t rdma_stat_sq_prod;
  71
  72 /*
  73  * This function implements reading and resetting an atomic_t stat
  74  * variable through read/write to a proc file. Any write to the file
  75  * resets the associated statistic to zero. Any read returns it's
  76  * current value.
  77  */
  78 static int read_reset_stat(ctl_table *table, int write,
  79                            struct file *filp, void __user *buffer, size_t *lenp,
  80                            loff_t *ppos)
  81 {
  82         atomic_t *stat = (atomic_t *)table->data;
  83
  84         if (!stat)
  85                 return -EINVAL;
  86
  87         if (write)
  88                 atomic_set(stat, 0);
  89         else {
  90                 char str_buf[32];
  91                 char *data;
  92                 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
  93                 if (len >= 32)
  94                         return -EFAULT;
  95                 len = strlen(str_buf);
  96                 if (*ppos > len) {
  97                         *lenp = 0;
  98                         return 0;
  99                 }
 100                 data = &str_buf[*ppos];
 101                 len -= *ppos;
 102                 if (len > *lenp)
 103                         len = *lenp;
 104                 if (len && copy_to_user(buffer, str_buf, len))
 105                         return -EFAULT;
 106                 *lenp = len;
 107                 *ppos += len;
 108         }
 109         return 0;
 110 }
 111
 112 static struct ctl_table_header *svcrdma_table_header;
 113 static ctl_table svcrdma_parm_table[] = {
 114         {
 115                 .procname       = "max_requests",
 116                 .data           = &svcrdma_max_requests,
 117                 .maxlen         = sizeof(unsigned int),
 118                 .mode           = 0644,
 119                 .proc_handler   = &proc_dointvec_minmax,
 120                 .strategy       = &sysctl_intvec,
 121                 .extra1         = &min_max_requests,
 122                 .extra2         = &max_max_requests
 123         },
 124         {
 125                 .procname       = "max_req_size",
 126                 .data           = &svcrdma_max_req_size,
 127                 .maxlen         = sizeof(unsigned int),
 128                 .mode           = 0644,
 129                 .proc_handler   = &proc_dointvec_minmax,
 130                 .strategy       = &sysctl_intvec,
 131                 .extra1         = &min_max_inline,
 132                 .extra2         = &max_max_inline
 133         },
 134         {
 135                 .procname       = "max_outbound_read_requests",
 136                 .data           = &svcrdma_ord,
 137                 .maxlen         = sizeof(unsigned int),
 138                 .mode           = 0644,
 139                 .proc_handler   = &proc_dointvec_minmax,
 140                 .strategy       = &sysctl_intvec,
 141                 .extra1         = &min_ord,
 142                 .extra2         = &max_ord,
 143         },
 144
 145         {
 146                 .procname       = "rdma_stat_read",
 147                 .data           = &rdma_stat_read,
 148                 .maxlen         = sizeof(atomic_t),
 149                 .mode           = 0644,
 150                 .proc_handler   = &read_reset_stat,
 151         },
 152         {
 153                 .procname       = "rdma_stat_recv",
 154                 .data           = &rdma_stat_recv,
 155                 .maxlen         = sizeof(atomic_t),
 156                 .mode           = 0644,
 157                 .proc_handler   = &read_reset_stat,
 158         },
 159         {
 160                 .procname       = "rdma_stat_write",
 161                 .data           = &rdma_stat_write,
 162                 .maxlen         = sizeof(atomic_t),
 163                 .mode           = 0644,
 164                 .proc_handler   = &read_reset_stat,
 165         },
 166         {
 167                 .procname       = "rdma_stat_sq_starve",
 168                 .data           = &rdma_stat_sq_starve,
 169                 .maxlen         = sizeof(atomic_t),
 170                 .mode           = 0644,
 171                 .proc_handler   = &read_reset_stat,
 172         },
 173         {
 174                 .procname       = "rdma_stat_rq_starve",
 175                 .data           = &rdma_stat_rq_starve,
 176                 .maxlen         = sizeof(atomic_t),
 177                 .mode           = 0644,
 178                 .proc_handler   = &read_reset_stat,
 179         },
 180         {
 181                 .procname       = "rdma_stat_rq_poll",
 182                 .data           = &rdma_stat_rq_poll,
 183                 .maxlen         = sizeof(atomic_t),
 184                 .mode           = 0644,
 185                 .proc_handler   = &read_reset_stat,
 186         },
 187         {
 188                 .procname       = "rdma_stat_rq_prod",
 189                 .data           = &rdma_stat_rq_prod,
 190                 .maxlen         = sizeof(atomic_t),
 191                 .mode           = 0644,
 192                 .proc_handler   = &read_reset_stat,
 193         },
 194         {
 195                 .procname       = "rdma_stat_sq_poll",
 196                 .data           = &rdma_stat_sq_poll,
 197                 .maxlen         = sizeof(atomic_t),
 198                 .mode           = 0644,
 199                 .proc_handler   = &read_reset_stat,
 200         },
 201         {
 202                 .procname       = "rdma_stat_sq_prod",
 203                 .data           = &rdma_stat_sq_prod,
 204                 .maxlen         = sizeof(atomic_t),
 205                 .mode           = 0644,
 206                 .proc_handler   = &read_reset_stat,
 207         },
 208         {
 209                 .ctl_name = 0,
 210         },
 211 };
 212
 213 static ctl_table svcrdma_table[] = {
 214         {
 215                 .procname       = "svc_rdma",
 216                 .mode           = 0555,
 217                 .child          = svcrdma_parm_table
 218         },
 219         {
 220                 .ctl_name = 0,
 221         },
 222 };
 223
 224 static ctl_table svcrdma_root_table[] = {
 225         {
 226                 .ctl_name       = CTL_SUNRPC,
 227                 .procname       = "sunrpc",
 228                 .mode           = 0555,
 229                 .child          = svcrdma_table
 230         },
 231         {
 232                 .ctl_name = 0,
 233         },
 234 };
 235
 236 void svc_rdma_cleanup(void)
 237 {
 238         dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
 239         if (svcrdma_table_header) {
 240                 unregister_sysctl_table(svcrdma_table_header);
 241                 svcrdma_table_header = NULL;
 242         }
 243         svc_unreg_xprt_class(&svc_rdma_class);
 244 }
 245
 246 int svc_rdma_init(void)
 247 {
 248         dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
 249         dprintk("\tsvcrdma_ord      : %d\n", svcrdma_ord);
 250         dprintk("\tmax_requests     : %d\n", svcrdma_max_requests);
 251         dprintk("\tsq_depth         : %d\n",
 252                 svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
 253         dprintk("\tmax_inline       : %d\n", svcrdma_max_req_size);
 254         if (!svcrdma_table_header)
 255                 svcrdma_table_header =
 256                         register_sysctl_table(svcrdma_root_table);
 257
 258         /* Register RDMA with the SVC transport switch */
 259         svc_reg_xprt_class(&svc_rdma_class);
 260         return 0;
 261 }
 262 MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
 263 MODULE_DESCRIPTION("SVC RDMA Transport");
 264 MODULE_LICENSE("Dual BSD/GPL");
 265 module_init(svc_rdma_init);
 266 module_exit(svc_rdma_cleanup);