Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_rd.c |
| 3 | * |
| 4 | * This file contains the Storage Engine <-> Ramdisk transport |
| 5 | * specific functions. |
| 6 | * |
| 7 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. |
| 8 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. |
| 9 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 10 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 11 | * |
| 12 | * Nicholas A. Bellinger <nab@kernel.org> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, write to the Free Software |
| 26 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | * |
| 28 | ******************************************************************************/ |
| 29 | |
| 30 | #include <linux/version.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/parser.h> |
| 33 | #include <linux/timer.h> |
| 34 | #include <linux/blkdev.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 37 | #include <scsi/scsi.h> |
| 38 | #include <scsi/scsi_host.h> |
| 39 | |
| 40 | #include <target/target_core_base.h> |
| 41 | #include <target/target_core_device.h> |
| 42 | #include <target/target_core_transport.h> |
| 43 | #include <target/target_core_fabric_ops.h> |
| 44 | |
| 45 | #include "target_core_rd.h" |
| 46 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 47 | static struct se_subsystem_api rd_mcp_template; |
| 48 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 49 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
| 50 | * |
| 51 | * |
| 52 | */ |
| 53 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
| 54 | { |
| 55 | struct rd_host *rd_host; |
| 56 | |
| 57 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 58 | if (!rd_host) { |
| 59 | pr_err("Unable to allocate memory for struct rd_host\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 60 | return -ENOMEM; |
| 61 | } |
| 62 | |
| 63 | rd_host->rd_host_id = host_id; |
| 64 | |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 65 | hba->hba_ptr = rd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 66 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 67 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 68 | " Generic Target Core Stack %s\n", hba->hba_id, |
| 69 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 70 | pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 71 | " MaxSectors: %u\n", hba->hba_id, |
| 72 | rd_host->rd_host_id, RD_MAX_SECTORS); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static void rd_detach_hba(struct se_hba *hba) |
| 78 | { |
| 79 | struct rd_host *rd_host = hba->hba_ptr; |
| 80 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 81 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 82 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
| 83 | |
| 84 | kfree(rd_host); |
| 85 | hba->hba_ptr = NULL; |
| 86 | } |
| 87 | |
| 88 | /* rd_release_device_space(): |
| 89 | * |
| 90 | * |
| 91 | */ |
| 92 | static void rd_release_device_space(struct rd_dev *rd_dev) |
| 93 | { |
| 94 | u32 i, j, page_count = 0, sg_per_table; |
| 95 | struct rd_dev_sg_table *sg_table; |
| 96 | struct page *pg; |
| 97 | struct scatterlist *sg; |
| 98 | |
| 99 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) |
| 100 | return; |
| 101 | |
| 102 | sg_table = rd_dev->sg_table_array; |
| 103 | |
| 104 | for (i = 0; i < rd_dev->sg_table_count; i++) { |
| 105 | sg = sg_table[i].sg_table; |
| 106 | sg_per_table = sg_table[i].rd_sg_count; |
| 107 | |
| 108 | for (j = 0; j < sg_per_table; j++) { |
| 109 | pg = sg_page(&sg[j]); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 110 | if (pg) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 111 | __free_page(pg); |
| 112 | page_count++; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | kfree(sg); |
| 117 | } |
| 118 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 119 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 120 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
| 121 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, |
| 122 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); |
| 123 | |
| 124 | kfree(sg_table); |
| 125 | rd_dev->sg_table_array = NULL; |
| 126 | rd_dev->sg_table_count = 0; |
| 127 | } |
| 128 | |
| 129 | |
| 130 | /* rd_build_device_space(): |
| 131 | * |
| 132 | * |
| 133 | */ |
| 134 | static int rd_build_device_space(struct rd_dev *rd_dev) |
| 135 | { |
| 136 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; |
| 137 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 138 | sizeof(struct scatterlist)); |
| 139 | struct rd_dev_sg_table *sg_table; |
| 140 | struct page *pg; |
| 141 | struct scatterlist *sg; |
| 142 | |
| 143 | if (rd_dev->rd_page_count <= 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 144 | pr_err("Illegal page count: %u for Ramdisk device\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 145 | rd_dev->rd_page_count); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 146 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 147 | } |
| 148 | total_sg_needed = rd_dev->rd_page_count; |
| 149 | |
| 150 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; |
| 151 | |
| 152 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 153 | if (!sg_table) { |
| 154 | pr_err("Unable to allocate memory for Ramdisk" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 155 | " scatterlist tables\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 156 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | rd_dev->sg_table_array = sg_table; |
| 160 | rd_dev->sg_table_count = sg_tables; |
| 161 | |
| 162 | while (total_sg_needed) { |
| 163 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
| 164 | max_sg_per_table : total_sg_needed; |
| 165 | |
| 166 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), |
| 167 | GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 168 | if (!sg) { |
| 169 | pr_err("Unable to allocate scatterlist array" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 170 | " for struct rd_dev\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 171 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 172 | } |
| 173 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 174 | sg_init_table(sg, sg_per_table); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 175 | |
| 176 | sg_table[i].sg_table = sg; |
| 177 | sg_table[i].rd_sg_count = sg_per_table; |
| 178 | sg_table[i].page_start_offset = page_offset; |
| 179 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) |
| 180 | - 1; |
| 181 | |
| 182 | for (j = 0; j < sg_per_table; j++) { |
| 183 | pg = alloc_pages(GFP_KERNEL, 0); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 184 | if (!pg) { |
| 185 | pr_err("Unable to allocate scatterlist" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 186 | " pages for struct rd_dev_sg_table\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 187 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 188 | } |
| 189 | sg_assign_page(&sg[j], pg); |
| 190 | sg[j].length = PAGE_SIZE; |
| 191 | } |
| 192 | |
| 193 | page_offset += sg_per_table; |
| 194 | total_sg_needed -= sg_per_table; |
| 195 | } |
| 196 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 197 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 198 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
| 199 | rd_dev->rd_dev_id, rd_dev->rd_page_count, |
| 200 | rd_dev->sg_table_count); |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static void *rd_allocate_virtdevice( |
| 206 | struct se_hba *hba, |
| 207 | const char *name, |
| 208 | int rd_direct) |
| 209 | { |
| 210 | struct rd_dev *rd_dev; |
| 211 | struct rd_host *rd_host = hba->hba_ptr; |
| 212 | |
| 213 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 214 | if (!rd_dev) { |
| 215 | pr_err("Unable to allocate memory for struct rd_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 216 | return NULL; |
| 217 | } |
| 218 | |
| 219 | rd_dev->rd_host = rd_host; |
| 220 | rd_dev->rd_direct = rd_direct; |
| 221 | |
| 222 | return rd_dev; |
| 223 | } |
| 224 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 225 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 226 | { |
| 227 | return rd_allocate_virtdevice(hba, name, 0); |
| 228 | } |
| 229 | |
| 230 | /* rd_create_virtdevice(): |
| 231 | * |
| 232 | * |
| 233 | */ |
| 234 | static struct se_device *rd_create_virtdevice( |
| 235 | struct se_hba *hba, |
| 236 | struct se_subsystem_dev *se_dev, |
| 237 | void *p, |
| 238 | int rd_direct) |
| 239 | { |
| 240 | struct se_device *dev; |
| 241 | struct se_dev_limits dev_limits; |
| 242 | struct rd_dev *rd_dev = p; |
| 243 | struct rd_host *rd_host = hba->hba_ptr; |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 244 | int dev_flags = 0, ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 245 | char prod[16], rev[4]; |
| 246 | |
| 247 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
| 248 | |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 249 | ret = rd_build_device_space(rd_dev); |
| 250 | if (ret < 0) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 251 | goto fail; |
| 252 | |
| 253 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); |
| 254 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : |
| 255 | RD_MCP_VERSION); |
| 256 | |
| 257 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; |
| 258 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; |
| 259 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; |
| 260 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; |
| 261 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; |
| 262 | |
| 263 | dev = transport_add_device_to_core_hba(hba, |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 264 | &rd_mcp_template, se_dev, dev_flags, rd_dev, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 265 | &dev_limits, prod, rev); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 266 | if (!dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 267 | goto fail; |
| 268 | |
| 269 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; |
| 270 | rd_dev->rd_queue_depth = dev->queue_depth; |
| 271 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 272 | pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 273 | " %u pages in %u tables, %lu total bytes\n", |
| 274 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : |
| 275 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, |
| 276 | rd_dev->sg_table_count, |
| 277 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); |
| 278 | |
| 279 | return dev; |
| 280 | |
| 281 | fail: |
| 282 | rd_release_device_space(rd_dev); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 283 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 284 | } |
| 285 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 286 | static struct se_device *rd_MEMCPY_create_virtdevice( |
| 287 | struct se_hba *hba, |
| 288 | struct se_subsystem_dev *se_dev, |
| 289 | void *p) |
| 290 | { |
| 291 | return rd_create_virtdevice(hba, se_dev, p, 0); |
| 292 | } |
| 293 | |
| 294 | /* rd_free_device(): (Part of se_subsystem_api_t template) |
| 295 | * |
| 296 | * |
| 297 | */ |
| 298 | static void rd_free_device(void *p) |
| 299 | { |
| 300 | struct rd_dev *rd_dev = p; |
| 301 | |
| 302 | rd_release_device_space(rd_dev); |
| 303 | kfree(rd_dev); |
| 304 | } |
| 305 | |
| 306 | static inline struct rd_request *RD_REQ(struct se_task *task) |
| 307 | { |
| 308 | return container_of(task, struct rd_request, rd_task); |
| 309 | } |
| 310 | |
| 311 | static struct se_task * |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 312 | rd_alloc_task(unsigned char *cdb) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 313 | { |
| 314 | struct rd_request *rd_req; |
| 315 | |
| 316 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); |
| 317 | if (!rd_req) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 318 | pr_err("Unable to allocate struct rd_request\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 319 | return NULL; |
| 320 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 321 | |
| 322 | return &rd_req->rd_task; |
| 323 | } |
| 324 | |
| 325 | /* rd_get_sg_table(): |
| 326 | * |
| 327 | * |
| 328 | */ |
| 329 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
| 330 | { |
| 331 | u32 i; |
| 332 | struct rd_dev_sg_table *sg_table; |
| 333 | |
| 334 | for (i = 0; i < rd_dev->sg_table_count; i++) { |
| 335 | sg_table = &rd_dev->sg_table_array[i]; |
| 336 | if ((sg_table->page_start_offset <= page) && |
| 337 | (sg_table->page_end_offset >= page)) |
| 338 | return sg_table; |
| 339 | } |
| 340 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 341 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 342 | page); |
| 343 | |
| 344 | return NULL; |
| 345 | } |
| 346 | |
| 347 | /* rd_MEMCPY_read(): |
| 348 | * |
| 349 | * |
| 350 | */ |
| 351 | static int rd_MEMCPY_read(struct rd_request *req) |
| 352 | { |
| 353 | struct se_task *task = &req->rd_task; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 354 | struct rd_dev *dev = req->rd_task.se_dev->dev_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 355 | struct rd_dev_sg_table *table; |
| 356 | struct scatterlist *sg_d, *sg_s; |
| 357 | void *dst, *src; |
| 358 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; |
| 359 | u32 length, page_end = 0, table_sg_end; |
| 360 | u32 rd_offset = req->rd_offset; |
| 361 | |
| 362 | table = rd_get_sg_table(dev, req->rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 363 | if (!table) |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 364 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 365 | |
| 366 | table_sg_end = (table->page_end_offset - req->rd_page); |
| 367 | sg_d = task->task_sg; |
| 368 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 369 | |
| 370 | pr_debug("RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 371 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
| 372 | req->rd_page, req->rd_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 373 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 374 | src_offset = rd_offset; |
| 375 | |
| 376 | while (req->rd_size) { |
| 377 | if ((sg_d[i].length - dst_offset) < |
| 378 | (sg_s[j].length - src_offset)) { |
| 379 | length = (sg_d[i].length - dst_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 380 | |
| 381 | pr_debug("Step 1 - sg_d[%d]: %p length: %d" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 382 | " offset: %u sg_s[%d].length: %u\n", i, |
| 383 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, |
| 384 | sg_s[j].length); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 385 | pr_debug("Step 1 - length: %u dst_offset: %u" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 386 | " src_offset: %u\n", length, dst_offset, |
| 387 | src_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 388 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 389 | if (length > req->rd_size) |
| 390 | length = req->rd_size; |
| 391 | |
| 392 | dst = sg_virt(&sg_d[i++]) + dst_offset; |
| 393 | if (!dst) |
| 394 | BUG(); |
| 395 | |
| 396 | src = sg_virt(&sg_s[j]) + src_offset; |
| 397 | if (!src) |
| 398 | BUG(); |
| 399 | |
| 400 | dst_offset = 0; |
| 401 | src_offset = length; |
| 402 | page_end = 0; |
| 403 | } else { |
| 404 | length = (sg_s[j].length - src_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 405 | |
| 406 | pr_debug("Step 2 - sg_d[%d]: %p length: %d" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 407 | " offset: %u sg_s[%d].length: %u\n", i, |
| 408 | &sg_d[i], sg_d[i].length, sg_d[i].offset, |
| 409 | j, sg_s[j].length); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 410 | pr_debug("Step 2 - length: %u dst_offset: %u" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 411 | " src_offset: %u\n", length, dst_offset, |
| 412 | src_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 413 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 414 | if (length > req->rd_size) |
| 415 | length = req->rd_size; |
| 416 | |
| 417 | dst = sg_virt(&sg_d[i]) + dst_offset; |
| 418 | if (!dst) |
| 419 | BUG(); |
| 420 | |
| 421 | if (sg_d[i].length == length) { |
| 422 | i++; |
| 423 | dst_offset = 0; |
| 424 | } else |
| 425 | dst_offset = length; |
| 426 | |
| 427 | src = sg_virt(&sg_s[j++]) + src_offset; |
| 428 | if (!src) |
| 429 | BUG(); |
| 430 | |
| 431 | src_offset = 0; |
| 432 | page_end = 1; |
| 433 | } |
| 434 | |
| 435 | memcpy(dst, src, length); |
| 436 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 437 | pr_debug("page: %u, remaining size: %u, length: %u," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 438 | " i: %u, j: %u\n", req->rd_page, |
| 439 | (req->rd_size - length), length, i, j); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 440 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 441 | req->rd_size -= length; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 442 | if (!req->rd_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 443 | return 0; |
| 444 | |
| 445 | if (!page_end) |
| 446 | continue; |
| 447 | |
| 448 | if (++req->rd_page <= table->page_end_offset) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 449 | pr_debug("page: %u in same page table\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 450 | req->rd_page); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 451 | continue; |
| 452 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 453 | |
| 454 | pr_debug("getting new page table for page: %u\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 455 | req->rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 456 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 457 | table = rd_get_sg_table(dev, req->rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 458 | if (!table) |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 459 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 460 | |
| 461 | sg_s = &table->sg_table[j = 0]; |
| 462 | } |
| 463 | |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | /* rd_MEMCPY_write(): |
| 468 | * |
| 469 | * |
| 470 | */ |
| 471 | static int rd_MEMCPY_write(struct rd_request *req) |
| 472 | { |
| 473 | struct se_task *task = &req->rd_task; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 474 | struct rd_dev *dev = req->rd_task.se_dev->dev_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 475 | struct rd_dev_sg_table *table; |
| 476 | struct scatterlist *sg_d, *sg_s; |
| 477 | void *dst, *src; |
| 478 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; |
| 479 | u32 length, page_end = 0, table_sg_end; |
| 480 | u32 rd_offset = req->rd_offset; |
| 481 | |
| 482 | table = rd_get_sg_table(dev, req->rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 483 | if (!table) |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 484 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 485 | |
| 486 | table_sg_end = (table->page_end_offset - req->rd_page); |
| 487 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; |
| 488 | sg_s = task->task_sg; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 489 | |
| 490 | pr_debug("RD[%d] Write LBA: %llu, Size: %u, Page: %u," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 491 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
| 492 | req->rd_page, req->rd_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 493 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 494 | dst_offset = rd_offset; |
| 495 | |
| 496 | while (req->rd_size) { |
| 497 | if ((sg_s[i].length - src_offset) < |
| 498 | (sg_d[j].length - dst_offset)) { |
| 499 | length = (sg_s[i].length - src_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 500 | |
| 501 | pr_debug("Step 1 - sg_s[%d]: %p length: %d" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 502 | " offset: %d sg_d[%d].length: %u\n", i, |
| 503 | &sg_s[i], sg_s[i].length, sg_s[i].offset, |
| 504 | j, sg_d[j].length); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 505 | pr_debug("Step 1 - length: %u src_offset: %u" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 506 | " dst_offset: %u\n", length, src_offset, |
| 507 | dst_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 508 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 509 | if (length > req->rd_size) |
| 510 | length = req->rd_size; |
| 511 | |
| 512 | src = sg_virt(&sg_s[i++]) + src_offset; |
| 513 | if (!src) |
| 514 | BUG(); |
| 515 | |
| 516 | dst = sg_virt(&sg_d[j]) + dst_offset; |
| 517 | if (!dst) |
| 518 | BUG(); |
| 519 | |
| 520 | src_offset = 0; |
| 521 | dst_offset = length; |
| 522 | page_end = 0; |
| 523 | } else { |
| 524 | length = (sg_d[j].length - dst_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 525 | |
| 526 | pr_debug("Step 2 - sg_s[%d]: %p length: %d" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 527 | " offset: %d sg_d[%d].length: %u\n", i, |
| 528 | &sg_s[i], sg_s[i].length, sg_s[i].offset, |
| 529 | j, sg_d[j].length); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 530 | pr_debug("Step 2 - length: %u src_offset: %u" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 531 | " dst_offset: %u\n", length, src_offset, |
| 532 | dst_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 533 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 534 | if (length > req->rd_size) |
| 535 | length = req->rd_size; |
| 536 | |
| 537 | src = sg_virt(&sg_s[i]) + src_offset; |
| 538 | if (!src) |
| 539 | BUG(); |
| 540 | |
| 541 | if (sg_s[i].length == length) { |
| 542 | i++; |
| 543 | src_offset = 0; |
| 544 | } else |
| 545 | src_offset = length; |
| 546 | |
| 547 | dst = sg_virt(&sg_d[j++]) + dst_offset; |
| 548 | if (!dst) |
| 549 | BUG(); |
| 550 | |
| 551 | dst_offset = 0; |
| 552 | page_end = 1; |
| 553 | } |
| 554 | |
| 555 | memcpy(dst, src, length); |
| 556 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 557 | pr_debug("page: %u, remaining size: %u, length: %u," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 558 | " i: %u, j: %u\n", req->rd_page, |
| 559 | (req->rd_size - length), length, i, j); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 560 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 561 | req->rd_size -= length; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 562 | if (!req->rd_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 563 | return 0; |
| 564 | |
| 565 | if (!page_end) |
| 566 | continue; |
| 567 | |
| 568 | if (++req->rd_page <= table->page_end_offset) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 569 | pr_debug("page: %u in same page table\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 570 | req->rd_page); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 571 | continue; |
| 572 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 573 | |
| 574 | pr_debug("getting new page table for page: %u\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 575 | req->rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 576 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 577 | table = rd_get_sg_table(dev, req->rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 578 | if (!table) |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 579 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 580 | |
| 581 | sg_d = &table->sg_table[j = 0]; |
| 582 | } |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) |
| 588 | * |
| 589 | * |
| 590 | */ |
| 591 | static int rd_MEMCPY_do_task(struct se_task *task) |
| 592 | { |
| 593 | struct se_device *dev = task->se_dev; |
| 594 | struct rd_request *req = RD_REQ(task); |
| 595 | unsigned long long lba; |
| 596 | int ret; |
| 597 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 598 | req->rd_page = (task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size) / PAGE_SIZE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 599 | lba = task->task_lba; |
| 600 | req->rd_offset = (do_div(lba, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 601 | (PAGE_SIZE / dev->se_sub_dev->se_dev_attrib.block_size))) * |
| 602 | dev->se_sub_dev->se_dev_attrib.block_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 603 | req->rd_size = task->task_size; |
| 604 | |
| 605 | if (task->task_data_direction == DMA_FROM_DEVICE) |
| 606 | ret = rd_MEMCPY_read(req); |
| 607 | else |
| 608 | ret = rd_MEMCPY_write(req); |
| 609 | |
| 610 | if (ret != 0) |
| 611 | return ret; |
| 612 | |
| 613 | task->task_scsi_status = GOOD; |
| 614 | transport_complete_task(task, 1); |
| 615 | |
| 616 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 617 | } |
| 618 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 619 | /* rd_free_task(): (Part of se_subsystem_api_t template) |
| 620 | * |
| 621 | * |
| 622 | */ |
| 623 | static void rd_free_task(struct se_task *task) |
| 624 | { |
| 625 | kfree(RD_REQ(task)); |
| 626 | } |
| 627 | |
| 628 | enum { |
| 629 | Opt_rd_pages, Opt_err |
| 630 | }; |
| 631 | |
| 632 | static match_table_t tokens = { |
| 633 | {Opt_rd_pages, "rd_pages=%d"}, |
| 634 | {Opt_err, NULL} |
| 635 | }; |
| 636 | |
| 637 | static ssize_t rd_set_configfs_dev_params( |
| 638 | struct se_hba *hba, |
| 639 | struct se_subsystem_dev *se_dev, |
| 640 | const char *page, |
| 641 | ssize_t count) |
| 642 | { |
| 643 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; |
| 644 | char *orig, *ptr, *opts; |
| 645 | substring_t args[MAX_OPT_ARGS]; |
| 646 | int ret = 0, arg, token; |
| 647 | |
| 648 | opts = kstrdup(page, GFP_KERNEL); |
| 649 | if (!opts) |
| 650 | return -ENOMEM; |
| 651 | |
| 652 | orig = opts; |
| 653 | |
| 654 | while ((ptr = strsep(&opts, ",")) != NULL) { |
| 655 | if (!*ptr) |
| 656 | continue; |
| 657 | |
| 658 | token = match_token(ptr, tokens, args); |
| 659 | switch (token) { |
| 660 | case Opt_rd_pages: |
| 661 | match_int(args, &arg); |
| 662 | rd_dev->rd_page_count = arg; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 663 | pr_debug("RAMDISK: Referencing Page" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 664 | " Count: %u\n", rd_dev->rd_page_count); |
| 665 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; |
| 666 | break; |
| 667 | default: |
| 668 | break; |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | kfree(orig); |
| 673 | return (!ret) ? count : ret; |
| 674 | } |
| 675 | |
| 676 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) |
| 677 | { |
| 678 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; |
| 679 | |
| 680 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 681 | pr_debug("Missing rd_pages= parameter\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 682 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 683 | } |
| 684 | |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static ssize_t rd_show_configfs_dev_params( |
| 689 | struct se_hba *hba, |
| 690 | struct se_subsystem_dev *se_dev, |
| 691 | char *b) |
| 692 | { |
| 693 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; |
| 694 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", |
| 695 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? |
| 696 | "rd_direct" : "rd_mcp"); |
| 697 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
| 698 | " SG_table_count: %u\n", rd_dev->rd_page_count, |
| 699 | PAGE_SIZE, rd_dev->sg_table_count); |
| 700 | return bl; |
| 701 | } |
| 702 | |
| 703 | /* rd_get_cdb(): (Part of se_subsystem_api_t template) |
| 704 | * |
| 705 | * |
| 706 | */ |
| 707 | static unsigned char *rd_get_cdb(struct se_task *task) |
| 708 | { |
| 709 | struct rd_request *req = RD_REQ(task); |
| 710 | |
| 711 | return req->rd_scsi_cdb; |
| 712 | } |
| 713 | |
| 714 | static u32 rd_get_device_rev(struct se_device *dev) |
| 715 | { |
| 716 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 717 | } |
| 718 | |
| 719 | static u32 rd_get_device_type(struct se_device *dev) |
| 720 | { |
| 721 | return TYPE_DISK; |
| 722 | } |
| 723 | |
| 724 | static sector_t rd_get_blocks(struct se_device *dev) |
| 725 | { |
| 726 | struct rd_dev *rd_dev = dev->dev_ptr; |
| 727 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 728 | dev->se_sub_dev->se_dev_attrib.block_size) - 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 729 | |
| 730 | return blocks_long; |
| 731 | } |
| 732 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 733 | static struct se_subsystem_api rd_mcp_template = { |
| 734 | .name = "rd_mcp", |
| 735 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
| 736 | .attach_hba = rd_attach_hba, |
| 737 | .detach_hba = rd_detach_hba, |
| 738 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, |
| 739 | .create_virtdevice = rd_MEMCPY_create_virtdevice, |
| 740 | .free_device = rd_free_device, |
| 741 | .alloc_task = rd_alloc_task, |
| 742 | .do_task = rd_MEMCPY_do_task, |
| 743 | .free_task = rd_free_task, |
| 744 | .check_configfs_dev_params = rd_check_configfs_dev_params, |
| 745 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
| 746 | .show_configfs_dev_params = rd_show_configfs_dev_params, |
| 747 | .get_cdb = rd_get_cdb, |
| 748 | .get_device_rev = rd_get_device_rev, |
| 749 | .get_device_type = rd_get_device_type, |
| 750 | .get_blocks = rd_get_blocks, |
| 751 | }; |
| 752 | |
| 753 | int __init rd_module_init(void) |
| 754 | { |
| 755 | int ret; |
| 756 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 757 | ret = transport_subsystem_register(&rd_mcp_template); |
| 758 | if (ret < 0) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 759 | return ret; |
| 760 | } |
| 761 | |
| 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | void rd_module_exit(void) |
| 766 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 767 | transport_subsystem_release(&rd_mcp_template); |
| 768 | } |