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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 /* Temporary NFS request map cache */
  73 struct kmem_cache *svc_rdma_map_cachep;
  74
  75 /*
  76  * This function implements reading and resetting an atomic_t stat
  77  * variable through read/write to a proc file. Any write to the file
  78  * resets the associated statistic to zero. Any read returns it's
  79  * current value.
  80  */
  81 static int read_reset_stat(ctl_table *table, int write,
  82                            struct file *filp, void __user *buffer, size_t *lenp,
  83                            loff_t *ppos)
  84 {
  85         atomic_t *stat = (atomic_t *)table->data;
  86
  87         if (!stat)
  88                 return -EINVAL;
  89
  90         if (write)
  91                 atomic_set(stat, 0);
  92         else {
  93                 char str_buf[32];
  94                 char *data;
  95                 int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
  96                 if (len >= 32)
  97                         return -EFAULT;
  98                 len = strlen(str_buf);
  99                 if (*ppos > len) {
 100                         *lenp = 0;
 101                         return 0;
 102                 }
 103                 data = &str_buf[*ppos];
 104                 len -= *ppos;
 105                 if (len > *lenp)
 106                         len = *lenp;
 107                 if (len && copy_to_user(buffer, str_buf, len))
 108                         return -EFAULT;
 109                 *lenp = len;
 110                 *ppos += len;
 111         }
 112         return 0;
 113 }
 114
 115 static struct ctl_table_header *svcrdma_table_header;
 116 static ctl_table svcrdma_parm_table[] = {
 117         {
 118                 .procname       = "max_requests",
 119                 .data           = &svcrdma_max_requests,
 120                 .maxlen         = sizeof(unsigned int),
 121                 .mode           = 0644,
 122                 .proc_handler   = &proc_dointvec_minmax,
 123                 .strategy       = &sysctl_intvec,
 124                 .extra1         = &min_max_requests,
 125                 .extra2         = &max_max_requests
 126         },
 127         {
 128                 .procname       = "max_req_size",
 129                 .data           = &svcrdma_max_req_size,
 130                 .maxlen         = sizeof(unsigned int),
 131                 .mode           = 0644,
 132                 .proc_handler   = &proc_dointvec_minmax,
 133                 .strategy       = &sysctl_intvec,
 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                 .strategy       = &sysctl_intvec,
 144                 .extra1         = &min_ord,
 145                 .extra2         = &max_ord,
 146         },
 147
 148         {
 149                 .procname       = "rdma_stat_read",
 150                 .data           = &rdma_stat_read,
 151                 .maxlen         = sizeof(atomic_t),
 152                 .mode           = 0644,
 153                 .proc_handler   = &read_reset_stat,
 154         },
 155         {
 156                 .procname       = "rdma_stat_recv",
 157                 .data           = &rdma_stat_recv,
 158                 .maxlen         = sizeof(atomic_t),
 159                 .mode           = 0644,
 160                 .proc_handler   = &read_reset_stat,
 161         },
 162         {
 163                 .procname       = "rdma_stat_write",
 164                 .data           = &rdma_stat_write,
 165                 .maxlen         = sizeof(atomic_t),
 166                 .mode           = 0644,
 167                 .proc_handler   = &read_reset_stat,
 168         },
 169         {
 170                 .procname       = "rdma_stat_sq_starve",
 171                 .data           = &rdma_stat_sq_starve,
 172                 .maxlen         = sizeof(atomic_t),
 173                 .mode           = 0644,
 174                 .proc_handler   = &read_reset_stat,
 175         },
 176         {
 177                 .procname       = "rdma_stat_rq_starve",
 178                 .data           = &rdma_stat_rq_starve,
 179                 .maxlen         = sizeof(atomic_t),
 180                 .mode           = 0644,
 181                 .proc_handler   = &read_reset_stat,
 182         },
 183         {
 184                 .procname       = "rdma_stat_rq_poll",
 185                 .data           = &rdma_stat_rq_poll,
 186                 .maxlen         = sizeof(atomic_t),
 187                 .mode           = 0644,
 188                 .proc_handler   = &read_reset_stat,
 189         },
 190         {
 191                 .procname       = "rdma_stat_rq_prod",
 192                 .data           = &rdma_stat_rq_prod,
 193                 .maxlen         = sizeof(atomic_t),
 194                 .mode           = 0644,
 195                 .proc_handler   = &read_reset_stat,
 196         },
 197         {
 198                 .procname       = "rdma_stat_sq_poll",
 199                 .data           = &rdma_stat_sq_poll,
 200                 .maxlen         = sizeof(atomic_t),
 201                 .mode           = 0644,
 202                 .proc_handler   = &read_reset_stat,
 203         },
 204         {
 205                 .procname       = "rdma_stat_sq_prod",
 206                 .data           = &rdma_stat_sq_prod,
 207                 .maxlen         = sizeof(atomic_t),
 208                 .mode           = 0644,
 209                 .proc_handler   = &read_reset_stat,
 210         },
 211         {
 212                 .ctl_name = 0,
 213         },
 214 };
 215
 216 static ctl_table svcrdma_table[] = {
 217         {
 218                 .procname       = "svc_rdma",
 219                 .mode           = 0555,
 220                 .child          = svcrdma_parm_table
 221         },
 222         {
 223                 .ctl_name = 0,
 224         },
 225 };
 226
 227 static ctl_table svcrdma_root_table[] = {
 228         {
 229                 .ctl_name       = CTL_SUNRPC,
 230                 .procname       = "sunrpc",
 231                 .mode           = 0555,
 232                 .child          = svcrdma_table
 233         },
 234         {
 235                 .ctl_name = 0,
 236         },
 237 };
 238
 239 void svc_rdma_cleanup(void)
 240 {
 241         dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
 242         if (svcrdma_table_header) {
 243                 unregister_sysctl_table(svcrdma_table_header);
 244                 svcrdma_table_header = NULL;
 245         }
 246         svc_unreg_xprt_class(&svc_rdma_class);
 247         kmem_cache_destroy(svc_rdma_map_cachep);
 248 }
 249
 250 int svc_rdma_init(void)
 251 {
 252         dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
 253         dprintk("\tsvcrdma_ord      : %d\n", svcrdma_ord);
 254         dprintk("\tmax_requests     : %d\n", svcrdma_max_requests);
 255         dprintk("\tsq_depth         : %d\n",
 256                 svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
 257         dprintk("\tmax_inline       : %d\n", svcrdma_max_req_size);
 258         if (!svcrdma_table_header)
 259                 svcrdma_table_header =
 260                         register_sysctl_table(svcrdma_root_table);
 261
 262         /* Create the temporary map cache */
 263         svc_rdma_map_cachep = kmem_cache_create("svc_rdma_map_cache",
 264                                                 sizeof(struct svc_rdma_req_map),
 265                                                 0,
 266                                                 SLAB_HWCACHE_ALIGN,
 267                                                 NULL);
 268         if (!svc_rdma_map_cachep) {
 269                 printk(KERN_INFO "Could not allocate map cache.\n");
 270                 goto err;
 271         }
 272
 273         /* Register RDMA with the SVC transport switch */
 274         svc_reg_xprt_class(&svc_rdma_class);
 275         return 0;
 276
 277  err:
 278         unregister_sysctl_table(svcrdma_table_header);
 279         return -ENOMEM;
 280 }
 281 MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
 282 MODULE_DESCRIPTION("SVC RDMA Transport");
 283 MODULE_LICENSE("Dual BSD/GPL");
 284 module_init(svc_rdma_init);
 285 module_exit(svc_rdma_cleanup);