1 /* 2 * Copyright 2014 Cisco Systems, Inc. All rights reserved. 3 * 4 * This program is free software; you may redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 15 * SOFTWARE. 16 */ 17 18 #ifndef _SNIC_H_ 19 #define _SNIC_H_ 20 21 #include <linux/module.h> 22 #include <linux/netdevice.h> 23 #include <linux/workqueue.h> 24 #include <linux/bitops.h> 25 #include <linux/mempool.h> 26 #include <scsi/scsi_cmnd.h> 27 #include <scsi/scsi.h> 28 #include <scsi/scsi_host.h> 29 30 #include "snic_disc.h" 31 #include "snic_io.h" 32 #include "snic_res.h" 33 #include "snic_trc.h" 34 #include "snic_stats.h" 35 #include "vnic_dev.h" 36 #include "vnic_wq.h" 37 #include "vnic_cq.h" 38 #include "vnic_intr.h" 39 #include "vnic_stats.h" 40 #include "vnic_snic.h" 41 42 #define SNIC_DRV_NAME "snic" 43 #define SNIC_DRV_DESCRIPTION "Cisco SCSI NIC Driver" 44 #define SNIC_DRV_VERSION "0.0.1.18" 45 #define PFX SNIC_DRV_NAME ":" 46 #define DFX SNIC_DRV_NAME "%d: " 47 48 #define DESC_CLEAN_LOW_WATERMARK 8 49 #define SNIC_UCSM_DFLT_THROTTLE_CNT_BLD 16 /* UCSM default throttle count */ 50 #define SNIC_MAX_IO_REQ 50 /* scsi_cmnd tag map entries */ 51 #define SNIC_MIN_IO_REQ 8 /* Min IO throttle count */ 52 #define SNIC_IO_LOCKS 64 /* IO locks: power of 2 */ 53 #define SNIC_DFLT_QUEUE_DEPTH 32 /* Default Queue Depth */ 54 #define SNIC_MAX_QUEUE_DEPTH 64 /* Max Queue Depth */ 55 #define SNIC_DFLT_CMD_TIMEOUT 90 /* Extended tmo for FW */ 56 57 /* 58 * Tag bits used for special requests. 59 */ 60 #define SNIC_TAG_ABORT BIT(30) /* Tag indicating abort */ 61 #define SNIC_TAG_DEV_RST BIT(29) /* Tag for device reset */ 62 #define SNIC_TAG_IOCTL_DEV_RST BIT(28) /* Tag for User Device Reset */ 63 #define SNIC_TAG_MASK (BIT(24) - 1) /* Mask for lookup */ 64 #define SNIC_NO_TAG -1 65 66 /* 67 * Command flags to identify the type of command and for other future use 68 */ 69 #define SNIC_NO_FLAGS 0 70 #define SNIC_IO_INITIALIZED BIT(0) 71 #define SNIC_IO_ISSUED BIT(1) 72 #define SNIC_IO_DONE BIT(2) 73 #define SNIC_IO_REQ_NULL BIT(3) 74 #define SNIC_IO_ABTS_PENDING BIT(4) 75 #define SNIC_IO_ABORTED BIT(5) 76 #define SNIC_IO_ABTS_ISSUED BIT(6) 77 #define SNIC_IO_TERM_ISSUED BIT(7) 78 #define SNIC_IO_ABTS_TIMEDOUT BIT(8) 79 #define SNIC_IO_ABTS_TERM_DONE BIT(9) 80 #define SNIC_IO_ABTS_TERM_REQ_NULL BIT(10) 81 #define SNIC_IO_ABTS_TERM_TIMEDOUT BIT(11) 82 #define SNIC_IO_INTERNAL_TERM_PENDING BIT(12) 83 #define SNIC_IO_INTERNAL_TERM_ISSUED BIT(13) 84 #define SNIC_DEVICE_RESET BIT(14) 85 #define SNIC_DEV_RST_ISSUED BIT(15) 86 #define SNIC_DEV_RST_TIMEDOUT BIT(16) 87 #define SNIC_DEV_RST_ABTS_ISSUED BIT(17) 88 #define SNIC_DEV_RST_TERM_ISSUED BIT(18) 89 #define SNIC_DEV_RST_DONE BIT(19) 90 #define SNIC_DEV_RST_REQ_NULL BIT(20) 91 #define SNIC_DEV_RST_ABTS_DONE BIT(21) 92 #define SNIC_DEV_RST_TERM_DONE BIT(22) 93 #define SNIC_DEV_RST_ABTS_PENDING BIT(23) 94 #define SNIC_DEV_RST_PENDING BIT(24) 95 #define SNIC_DEV_RST_NOTSUP BIT(25) 96 #define SNIC_SCSI_CLEANUP BIT(26) 97 #define SNIC_HOST_RESET_ISSUED BIT(27) 98 #define SNIC_HOST_RESET_CMD_TERM \ 99 (SNIC_DEV_RST_NOTSUP | SNIC_SCSI_CLEANUP | SNIC_HOST_RESET_ISSUED) 100 101 #define SNIC_ABTS_TIMEOUT 30000 /* msec */ 102 #define SNIC_LUN_RESET_TIMEOUT 30000 /* msec */ 103 #define SNIC_HOST_RESET_TIMEOUT 30000 /* msec */ 104 105 106 /* 107 * These are protected by the hashed req_lock. 108 */ 109 #define CMD_SP(Cmnd) \ 110 (((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->rqi) 111 #define CMD_STATE(Cmnd) \ 112 (((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->state) 113 #define CMD_ABTS_STATUS(Cmnd) \ 114 (((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->abts_status) 115 #define CMD_LR_STATUS(Cmnd) \ 116 (((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->lr_status) 117 #define CMD_FLAGS(Cmnd) \ 118 (((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->flags) 119 120 #define SNIC_INVALID_CODE 0x100 /* Hdr Status val unused by firmware */ 121 122 #define SNIC_MAX_TARGET 256 123 #define SNIC_FLAGS_NONE (0) 124 125 /* snic module params */ 126 extern unsigned int snic_max_qdepth; 127 128 /* snic debugging */ 129 extern unsigned int snic_log_level; 130 131 #define SNIC_MAIN_LOGGING 0x1 132 #define SNIC_SCSI_LOGGING 0x2 133 #define SNIC_ISR_LOGGING 0x8 134 #define SNIC_DESC_LOGGING 0x10 135 136 #define SNIC_CHECK_LOGGING(LEVEL, CMD) \ 137 do { \ 138 if (unlikely(snic_log_level & LEVEL)) \ 139 do { \ 140 CMD; \ 141 } while (0); \ 142 } while (0) 143 144 #define SNIC_MAIN_DBG(host, fmt, args...) \ 145 SNIC_CHECK_LOGGING(SNIC_MAIN_LOGGING, \ 146 shost_printk(KERN_INFO, host, fmt, ## args);) 147 148 #define SNIC_SCSI_DBG(host, fmt, args...) \ 149 SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING, \ 150 shost_printk(KERN_INFO, host, fmt, ##args);) 151 152 #define SNIC_DISC_DBG(host, fmt, args...) \ 153 SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING, \ 154 shost_printk(KERN_INFO, host, fmt, ##args);) 155 156 #define SNIC_ISR_DBG(host, fmt, args...) \ 157 SNIC_CHECK_LOGGING(SNIC_ISR_LOGGING, \ 158 shost_printk(KERN_INFO, host, fmt, ##args);) 159 160 #define SNIC_HOST_ERR(host, fmt, args...) \ 161 shost_printk(KERN_ERR, host, fmt, ##args) 162 163 #define SNIC_HOST_INFO(host, fmt, args...) \ 164 shost_printk(KERN_INFO, host, fmt, ##args) 165 166 #define SNIC_INFO(fmt, args...) \ 167 pr_info(PFX fmt, ## args) 168 169 #define SNIC_DBG(fmt, args...) \ 170 pr_info(PFX fmt, ## args) 171 172 #define SNIC_ERR(fmt, args...) \ 173 pr_err(PFX fmt, ## args) 174 175 #ifdef DEBUG 176 #define SNIC_BUG_ON(EXPR) \ 177 ({ \ 178 if (EXPR) { \ 179 SNIC_ERR("SNIC BUG(%s)\n", #EXPR); \ 180 BUG_ON(EXPR); \ 181 } \ 182 }) 183 #else 184 #define SNIC_BUG_ON(EXPR) \ 185 ({ \ 186 if (EXPR) { \ 187 SNIC_ERR("SNIC BUG(%s) at %s : %d\n", \ 188 #EXPR, __func__, __LINE__); \ 189 WARN_ON_ONCE(EXPR); \ 190 } \ 191 }) 192 #endif 193 194 /* Soft assert */ 195 #define SNIC_ASSERT_NOT_IMPL(EXPR) \ 196 ({ \ 197 if (EXPR) {\ 198 SNIC_INFO("Functionality not impl'ed at %s:%d\n", \ 199 __func__, __LINE__); \ 200 WARN_ON_ONCE(EXPR); \ 201 } \ 202 }) 203 204 205 extern const char *snic_state_str[]; 206 207 enum snic_intx_intr_index { 208 SNIC_INTX_WQ_RQ_COPYWQ, 209 SNIC_INTX_ERR, 210 SNIC_INTX_NOTIFY, 211 SNIC_INTX_INTR_MAX, 212 }; 213 214 enum snic_msix_intr_index { 215 SNIC_MSIX_WQ, 216 SNIC_MSIX_IO_CMPL, 217 SNIC_MSIX_ERR_NOTIFY, 218 SNIC_MSIX_INTR_MAX, 219 }; 220 221 #define SNIC_INTRHDLR_NAMSZ (2 * IFNAMSIZ) 222 struct snic_msix_entry { 223 int requested; 224 char devname[SNIC_INTRHDLR_NAMSZ]; 225 irqreturn_t (*isr)(int, void *); 226 void *devid; 227 }; 228 229 enum snic_state { 230 SNIC_INIT = 0, 231 SNIC_ERROR, 232 SNIC_ONLINE, 233 SNIC_OFFLINE, 234 SNIC_FWRESET, 235 }; 236 237 #define SNIC_WQ_MAX 1 238 #define SNIC_CQ_IO_CMPL_MAX 1 239 #define SNIC_CQ_MAX (SNIC_WQ_MAX + SNIC_CQ_IO_CMPL_MAX) 240 241 /* firmware version information */ 242 struct snic_fw_info { 243 u32 fw_ver; 244 u32 hid; /* u16 hid | u16 vnic id */ 245 u32 max_concur_ios; /* max concurrent ios */ 246 u32 max_sgs_per_cmd; /* max sgls per IO */ 247 u32 max_io_sz; /* max io size supported */ 248 u32 hba_cap; /* hba capabilities */ 249 u32 max_tgts; /* max tgts supported */ 250 u16 io_tmo; /* FW Extended timeout */ 251 struct completion *wait; /* protected by snic lock*/ 252 }; 253 254 /* 255 * snic_work item : defined to process asynchronous events 256 */ 257 struct snic_work { 258 struct work_struct work; 259 u16 ev_id; 260 u64 *ev_data; 261 }; 262 263 /* 264 * snic structure to represent SCSI vNIC 265 */ 266 struct snic { 267 /* snic specific members */ 268 struct list_head list; 269 char name[IFNAMSIZ]; 270 atomic_t state; 271 spinlock_t snic_lock; 272 struct completion *remove_wait; 273 bool in_remove; 274 bool stop_link_events; /* stop processing link events */ 275 276 /* discovery related */ 277 struct snic_disc disc; 278 279 /* Scsi Host info */ 280 struct Scsi_Host *shost; 281 282 /* vnic related structures */ 283 struct vnic_dev_bar bar0; 284 285 struct vnic_stats *stats; 286 unsigned long stats_time; 287 unsigned long stats_reset_time; 288 289 struct vnic_dev *vdev; 290 291 /* hw resource info */ 292 unsigned int wq_count; 293 unsigned int cq_count; 294 unsigned int intr_count; 295 unsigned int err_intr_offset; 296 297 int link_status; /* retrieved from svnic_dev_link_status() */ 298 u32 link_down_cnt; 299 300 /* pci related */ 301 struct pci_dev *pdev; 302 struct snic_msix_entry msix[SNIC_MSIX_INTR_MAX]; 303 304 /* io related info */ 305 mempool_t *req_pool[SNIC_REQ_MAX_CACHES]; /* (??) */ 306 ____cacheline_aligned spinlock_t io_req_lock[SNIC_IO_LOCKS]; 307 308 /* Maintain snic specific commands, cmds with no tag in spl_cmd_list */ 309 ____cacheline_aligned spinlock_t spl_cmd_lock; 310 struct list_head spl_cmd_list; 311 312 unsigned int max_tag_id; 313 atomic_t ios_inflight; /* io in flight counter */ 314 315 struct vnic_snic_config config; 316 317 struct work_struct link_work; 318 319 /* firmware information */ 320 struct snic_fw_info fwinfo; 321 322 /* Work for processing Target related work */ 323 struct work_struct tgt_work; 324 325 /* Work for processing Discovery */ 326 struct work_struct disc_work; 327 328 /* stats related */ 329 unsigned int reset_stats; 330 atomic64_t io_cmpl_skip; 331 struct snic_stats s_stats; /* Per SNIC driver stats */ 332 333 /* platform specific */ 334 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 335 struct dentry *stats_host; /* Per snic debugfs root */ 336 struct dentry *stats_file; /* Per snic debugfs file */ 337 struct dentry *reset_stats_file;/* Per snic reset stats file */ 338 #endif 339 340 /* completion queue cache line section */ 341 ____cacheline_aligned struct vnic_cq cq[SNIC_CQ_MAX]; 342 343 /* work queue cache line section */ 344 ____cacheline_aligned struct vnic_wq wq[SNIC_WQ_MAX]; 345 spinlock_t wq_lock[SNIC_WQ_MAX]; 346 347 /* interrupt resource cache line section */ 348 ____cacheline_aligned struct vnic_intr intr[SNIC_MSIX_INTR_MAX]; 349 }; /* end of snic structure */ 350 351 /* 352 * SNIC Driver's Global Data 353 */ 354 struct snic_global { 355 struct list_head snic_list; 356 spinlock_t snic_list_lock; 357 358 struct kmem_cache *req_cache[SNIC_REQ_MAX_CACHES]; 359 360 struct workqueue_struct *event_q; 361 362 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS 363 /* debugfs related global data */ 364 struct dentry *trc_root; 365 struct dentry *stats_root; 366 367 struct snic_trc trc ____cacheline_aligned; 368 #endif 369 }; 370 371 extern struct snic_global *snic_glob; 372 373 int snic_glob_init(void); 374 void snic_glob_cleanup(void); 375 376 extern struct workqueue_struct *snic_event_queue; 377 extern struct device_attribute *snic_attrs[]; 378 379 int snic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); 380 int snic_abort_cmd(struct scsi_cmnd *); 381 int snic_device_reset(struct scsi_cmnd *); 382 int snic_host_reset(struct scsi_cmnd *); 383 int snic_reset(struct Scsi_Host *, struct scsi_cmnd *); 384 void snic_shutdown_scsi_cleanup(struct snic *); 385 386 387 int snic_request_intr(struct snic *); 388 void snic_free_intr(struct snic *); 389 int snic_set_intr_mode(struct snic *); 390 void snic_clear_intr_mode(struct snic *); 391 392 int snic_fwcq_cmpl_handler(struct snic *, int); 393 int snic_wq_cmpl_handler(struct snic *, int); 394 void snic_free_wq_buf(struct vnic_wq *, struct vnic_wq_buf *); 395 396 397 void snic_log_q_error(struct snic *); 398 void snic_handle_link_event(struct snic *); 399 void snic_handle_link(struct work_struct *); 400 401 int snic_queue_exch_ver_req(struct snic *); 402 int snic_io_exch_ver_cmpl_handler(struct snic *, struct snic_fw_req *); 403 404 int snic_queue_wq_desc(struct snic *, void *os_buf, u16 len); 405 406 void snic_handle_untagged_req(struct snic *, struct snic_req_info *); 407 void snic_release_untagged_req(struct snic *, struct snic_req_info *); 408 void snic_free_all_untagged_reqs(struct snic *); 409 int snic_get_conf(struct snic *); 410 void snic_set_state(struct snic *, enum snic_state); 411 int snic_get_state(struct snic *); 412 const char *snic_state_to_str(unsigned int); 413 void snic_hex_dump(char *, char *, int); 414 void snic_print_desc(const char *fn, char *os_buf, int len); 415 const char *show_opcode_name(int val); 416 #endif /* _SNIC_H */ 417