1/* bnx2i.c: QLogic NetXtreme II iSCSI driver. 2 * 3 * Copyright (c) 2006 - 2013 Broadcom Corporation 4 * Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved. 5 * Copyright (c) 2007, 2008 Mike Christie 6 * Copyright (c) 2014, QLogic Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation. 11 * 12 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com) 13 * Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com) 14 * Maintained by: QLogic-Storage-Upstream@qlogic.com 15 */ 16 17#include "bnx2i.h" 18 19static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list); 20static u32 adapter_count; 21 22#define DRV_MODULE_NAME "bnx2i" 23#define DRV_MODULE_VERSION "2.7.10.1" 24#define DRV_MODULE_RELDATE "Jul 16, 2014" 25 26static char version[] = 27 "QLogic NetXtreme II iSCSI Driver " DRV_MODULE_NAME \ 28 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 29 30 31MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com> and " 32 "Eddie Wai <eddie.wai@broadcom.com>"); 33 34MODULE_DESCRIPTION("QLogic NetXtreme II BCM5706/5708/5709/57710/57711/57712" 35 "/57800/57810/57840 iSCSI Driver"); 36MODULE_LICENSE("GPL"); 37MODULE_VERSION(DRV_MODULE_VERSION); 38 39static DEFINE_MUTEX(bnx2i_dev_lock); 40 41unsigned int event_coal_min = 24; 42module_param(event_coal_min, int, 0664); 43MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands"); 44 45unsigned int event_coal_div = 2; 46module_param(event_coal_div, int, 0664); 47MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor"); 48 49unsigned int en_tcp_dack = 1; 50module_param(en_tcp_dack, int, 0664); 51MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK"); 52 53unsigned int error_mask1 = 0x00; 54module_param(error_mask1, uint, 0664); 55MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1"); 56 57unsigned int error_mask2 = 0x00; 58module_param(error_mask2, uint, 0664); 59MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2"); 60 61unsigned int sq_size; 62module_param(sq_size, int, 0664); 63MODULE_PARM_DESC(sq_size, "Configure SQ size"); 64 65unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT; 66module_param(rq_size, int, 0664); 67MODULE_PARM_DESC(rq_size, "Configure RQ size"); 68 69u64 iscsi_error_mask = 0x00; 70 71DEFINE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu); 72 73/** 74 * bnx2i_identify_device - identifies NetXtreme II device type 75 * @hba: Adapter structure pointer 76 * @dev: Corresponding cnic device 77 * 78 * This function identifies the NX2 device type and sets appropriate 79 * queue mailbox register access method, 5709 requires driver to 80 * access MBOX regs using *bin* mode 81 */ 82void bnx2i_identify_device(struct bnx2i_hba *hba, struct cnic_dev *dev) 83{ 84 hba->cnic_dev_type = 0; 85 if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) { 86 if (hba->pci_did == PCI_DEVICE_ID_NX2_5706 || 87 hba->pci_did == PCI_DEVICE_ID_NX2_5706S) { 88 set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type); 89 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_5708 || 90 hba->pci_did == PCI_DEVICE_ID_NX2_5708S) { 91 set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type); 92 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_5709 || 93 hba->pci_did == PCI_DEVICE_ID_NX2_5709S) { 94 set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type); 95 hba->mail_queue_access = BNX2I_MQ_BIN_MODE; 96 } 97 } else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) { 98 set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type); 99 } else { 100 printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n", 101 hba->pci_did); 102 } 103} 104 105 106/** 107 * get_adapter_list_head - returns head of adapter list 108 */ 109struct bnx2i_hba *get_adapter_list_head(void) 110{ 111 struct bnx2i_hba *hba = NULL; 112 struct bnx2i_hba *tmp_hba; 113 114 if (!adapter_count) 115 goto hba_not_found; 116 117 mutex_lock(&bnx2i_dev_lock); 118 list_for_each_entry(tmp_hba, &adapter_list, link) { 119 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) { 120 hba = tmp_hba; 121 break; 122 } 123 } 124 mutex_unlock(&bnx2i_dev_lock); 125hba_not_found: 126 return hba; 127} 128 129 130/** 131 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance 132 * @cnic: pointer to cnic device instance 133 * 134 */ 135struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic) 136{ 137 struct bnx2i_hba *hba, *temp; 138 139 mutex_lock(&bnx2i_dev_lock); 140 list_for_each_entry_safe(hba, temp, &adapter_list, link) { 141 if (hba->cnic == cnic) { 142 mutex_unlock(&bnx2i_dev_lock); 143 return hba; 144 } 145 } 146 mutex_unlock(&bnx2i_dev_lock); 147 return NULL; 148} 149 150 151/** 152 * bnx2i_start - cnic callback to initialize & start adapter instance 153 * @handle: transparent handle pointing to adapter structure 154 * 155 * This function maps adapter structure to pcidev structure and initiates 156 * firmware handshake to enable/initialize on chip iscsi components 157 * This bnx2i - cnic interface api callback is issued after following 158 * 2 conditions are met - 159 * a) underlying network interface is up (marked by event 'NETDEV_UP' 160 * from netdev 161 * b) bnx2i adapter instance is registered 162 */ 163void bnx2i_start(void *handle) 164{ 165#define BNX2I_INIT_POLL_TIME (1000 / HZ) 166 struct bnx2i_hba *hba = handle; 167 int i = HZ; 168 169 /* On some bnx2x devices, it is possible that iSCSI is no 170 * longer supported after firmware is downloaded. In that 171 * case, the iscsi_init_msg will return failure. 172 */ 173 174 bnx2i_send_fw_iscsi_init_msg(hba); 175 while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && 176 !test_bit(ADAPTER_STATE_INIT_FAILED, &hba->adapter_state) && i--) 177 msleep(BNX2I_INIT_POLL_TIME); 178} 179 180 181/** 182 * bnx2i_chip_cleanup - local routine to handle chip cleanup 183 * @hba: Adapter instance to register 184 * 185 * Driver checks if adapter still has any active connections before 186 * executing the cleanup process 187 */ 188static void bnx2i_chip_cleanup(struct bnx2i_hba *hba) 189{ 190 struct bnx2i_endpoint *bnx2i_ep; 191 struct list_head *pos, *tmp; 192 193 if (hba->ofld_conns_active) { 194 /* Stage to force the disconnection 195 * This is the case where the daemon is either slow or 196 * not present 197 */ 198 printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active " 199 "connections\n", hba->netdev->name, 200 hba->ofld_conns_active); 201 mutex_lock(&hba->net_dev_lock); 202 list_for_each_safe(pos, tmp, &hba->ep_active_list) { 203 bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link); 204 /* Clean up the chip only */ 205 bnx2i_hw_ep_disconnect(bnx2i_ep); 206 bnx2i_ep->cm_sk = NULL; 207 } 208 mutex_unlock(&hba->net_dev_lock); 209 } 210} 211 212 213/** 214 * bnx2i_stop - cnic callback to shutdown adapter instance 215 * @handle: transparent handle pointing to adapter structure 216 * 217 * driver checks if adapter is already in shutdown mode, if not start 218 * the shutdown process 219 */ 220void bnx2i_stop(void *handle) 221{ 222 struct bnx2i_hba *hba = handle; 223 int conns_active; 224 int wait_delay = 1 * HZ; 225 226 /* check if cleanup happened in GOING_DOWN context */ 227 if (!test_and_set_bit(ADAPTER_STATE_GOING_DOWN, 228 &hba->adapter_state)) { 229 iscsi_host_for_each_session(hba->shost, 230 bnx2i_drop_session); 231 wait_delay = hba->hba_shutdown_tmo; 232 } 233 /* Wait for inflight offload connection tasks to complete before 234 * proceeding. Forcefully terminate all connection recovery in 235 * progress at the earliest, either in bind(), send_pdu(LOGIN), 236 * or conn_start() 237 */ 238 wait_event_interruptible_timeout(hba->eh_wait, 239 (list_empty(&hba->ep_ofld_list) && 240 list_empty(&hba->ep_destroy_list)), 241 2 * HZ); 242 /* Wait for all endpoints to be torn down, Chip will be reset once 243 * control returns to network driver. So it is required to cleanup and 244 * release all connection resources before returning from this routine. 245 */ 246 while (hba->ofld_conns_active) { 247 conns_active = hba->ofld_conns_active; 248 wait_event_interruptible_timeout(hba->eh_wait, 249 (hba->ofld_conns_active != conns_active), 250 wait_delay); 251 if (hba->ofld_conns_active == conns_active) 252 break; 253 } 254 bnx2i_chip_cleanup(hba); 255 256 /* This flag should be cleared last so that ep_disconnect() gracefully 257 * cleans up connection context 258 */ 259 clear_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state); 260 clear_bit(ADAPTER_STATE_UP, &hba->adapter_state); 261} 262 263 264/** 265 * bnx2i_init_one - initialize an adapter instance and allocate memory resources 266 * @hba: bnx2i adapter instance 267 * @cnic: cnic device handle 268 * 269 * Global resource lock is held during critical sections below. This routine is 270 * called from either cnic_register_driver() or device hot plug context and 271 * and does majority of device specific initialization 272 */ 273static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) 274{ 275 int rc; 276 277 mutex_lock(&bnx2i_dev_lock); 278 if (!cnic->max_iscsi_conn) { 279 printk(KERN_ALERT "bnx2i: dev %s does not support " 280 "iSCSI\n", hba->netdev->name); 281 rc = -EOPNOTSUPP; 282 goto out; 283 } 284 285 hba->cnic = cnic; 286 rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba); 287 if (!rc) { 288 hba->age++; 289 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 290 list_add_tail(&hba->link, &adapter_list); 291 adapter_count++; 292 } else if (rc == -EBUSY) /* duplicate registration */ 293 printk(KERN_ALERT "bnx2i, duplicate registration" 294 "hba=%p, cnic=%p\n", hba, cnic); 295 else if (rc == -EAGAIN) 296 printk(KERN_ERR "bnx2i, driver not registered\n"); 297 else if (rc == -EINVAL) 298 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI); 299 else 300 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc); 301 302out: 303 mutex_unlock(&bnx2i_dev_lock); 304 305 return rc; 306} 307 308 309/** 310 * bnx2i_ulp_init - initialize an adapter instance 311 * @dev: cnic device handle 312 * 313 * Called from cnic_register_driver() context to initialize all enumerated 314 * cnic devices. This routine allocate adapter structure and other 315 * device specific resources. 316 */ 317void bnx2i_ulp_init(struct cnic_dev *dev) 318{ 319 struct bnx2i_hba *hba; 320 321 /* Allocate a HBA structure for this device */ 322 hba = bnx2i_alloc_hba(dev); 323 if (!hba) { 324 printk(KERN_ERR "bnx2i init: hba initialization failed\n"); 325 return; 326 } 327 328 /* Get PCI related information and update hba struct members */ 329 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 330 if (bnx2i_init_one(hba, dev)) { 331 printk(KERN_ERR "bnx2i - hba %p init failed\n", hba); 332 bnx2i_free_hba(hba); 333 } 334} 335 336 337/** 338 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources 339 * @dev: cnic device handle 340 * 341 */ 342void bnx2i_ulp_exit(struct cnic_dev *dev) 343{ 344 struct bnx2i_hba *hba; 345 346 hba = bnx2i_find_hba_for_cnic(dev); 347 if (!hba) { 348 printk(KERN_INFO "bnx2i_ulp_exit: hba not " 349 "found, dev 0x%p\n", dev); 350 return; 351 } 352 mutex_lock(&bnx2i_dev_lock); 353 list_del_init(&hba->link); 354 adapter_count--; 355 356 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 357 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 358 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 359 } 360 mutex_unlock(&bnx2i_dev_lock); 361 362 bnx2i_free_hba(hba); 363} 364 365 366/** 367 * bnx2i_get_stats - Retrieve various statistic from iSCSI offload 368 * @handle: bnx2i_hba 369 * 370 * function callback exported via bnx2i - cnic driver interface to 371 * retrieve various iSCSI offload related statistics. 372 */ 373int bnx2i_get_stats(void *handle) 374{ 375 struct bnx2i_hba *hba = handle; 376 struct iscsi_stats_info *stats; 377 378 if (!hba) 379 return -EINVAL; 380 381 stats = (struct iscsi_stats_info *)hba->cnic->stats_addr; 382 383 if (!stats) 384 return -ENOMEM; 385 386 strscpy(stats->version, DRV_MODULE_VERSION, sizeof(stats->version)); 387 memcpy(stats->mac_add1 + 2, hba->cnic->mac_addr, ETH_ALEN); 388 389 stats->max_frame_size = hba->netdev->mtu; 390 stats->txq_size = hba->max_sqes; 391 stats->rxq_size = hba->max_cqes; 392 393 stats->txq_avg_depth = 0; 394 stats->rxq_avg_depth = 0; 395 396 GET_STATS_64(hba, stats, rx_pdus); 397 GET_STATS_64(hba, stats, rx_bytes); 398 399 GET_STATS_64(hba, stats, tx_pdus); 400 GET_STATS_64(hba, stats, tx_bytes); 401 402 return 0; 403} 404 405 406/** 407 * bnx2i_cpu_online - Create a receive thread for an online CPU 408 * 409 * @cpu: cpu index for the online cpu 410 */ 411static int bnx2i_cpu_online(unsigned int cpu) 412{ 413 struct bnx2i_percpu_s *p; 414 struct task_struct *thread; 415 416 p = &per_cpu(bnx2i_percpu, cpu); 417 418 thread = kthread_create_on_node(bnx2i_percpu_io_thread, (void *)p, 419 cpu_to_node(cpu), 420 "bnx2i_thread/%d", cpu); 421 if (IS_ERR(thread)) 422 return PTR_ERR(thread); 423 424 /* bind thread to the cpu */ 425 kthread_bind(thread, cpu); 426 p->iothread = thread; 427 wake_up_process(thread); 428 return 0; 429} 430 431static int bnx2i_cpu_offline(unsigned int cpu) 432{ 433 struct bnx2i_percpu_s *p; 434 struct task_struct *thread; 435 struct bnx2i_work *work, *tmp; 436 437 /* Prevent any new work from being queued for this CPU */ 438 p = &per_cpu(bnx2i_percpu, cpu); 439 spin_lock_bh(&p->p_work_lock); 440 thread = p->iothread; 441 p->iothread = NULL; 442 443 /* Free all work in the list */ 444 list_for_each_entry_safe(work, tmp, &p->work_list, list) { 445 list_del_init(&work->list); 446 bnx2i_process_scsi_cmd_resp(work->session, 447 work->bnx2i_conn, &work->cqe); 448 kfree(work); 449 } 450 451 spin_unlock_bh(&p->p_work_lock); 452 if (thread) 453 kthread_stop(thread); 454 return 0; 455} 456 457static enum cpuhp_state bnx2i_online_state; 458 459/** 460 * bnx2i_mod_init - module init entry point 461 * 462 * initialize any driver wide global data structures such as endpoint pool, 463 * tcp port manager/queue, sysfs. finally driver will register itself 464 * with the cnic module 465 */ 466static int __init bnx2i_mod_init(void) 467{ 468 int err; 469 unsigned cpu = 0; 470 struct bnx2i_percpu_s *p; 471 472 printk(KERN_INFO "%s", version); 473 474 if (sq_size && !is_power_of_2(sq_size)) 475 sq_size = roundup_pow_of_two(sq_size); 476 477 bnx2i_scsi_xport_template = 478 iscsi_register_transport(&bnx2i_iscsi_transport); 479 if (!bnx2i_scsi_xport_template) { 480 printk(KERN_ERR "Could not register bnx2i transport.\n"); 481 err = -ENOMEM; 482 goto out; 483 } 484 485 err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb); 486 if (err) { 487 printk(KERN_ERR "Could not register bnx2i cnic driver.\n"); 488 goto unreg_xport; 489 } 490 491 /* Create percpu kernel threads to handle iSCSI I/O completions */ 492 for_each_possible_cpu(cpu) { 493 p = &per_cpu(bnx2i_percpu, cpu); 494 INIT_LIST_HEAD(&p->work_list); 495 spin_lock_init(&p->p_work_lock); 496 p->iothread = NULL; 497 } 498 499 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "scsi/bnx2i:online", 500 bnx2i_cpu_online, bnx2i_cpu_offline); 501 if (err < 0) 502 goto unreg_driver; 503 bnx2i_online_state = err; 504 return 0; 505 506unreg_driver: 507 cnic_unregister_driver(CNIC_ULP_ISCSI); 508unreg_xport: 509 iscsi_unregister_transport(&bnx2i_iscsi_transport); 510out: 511 return err; 512} 513 514 515/** 516 * bnx2i_mod_exit - module cleanup/exit entry point 517 * 518 * Global resource lock and host adapter lock is held during critical sections 519 * in this function. Driver will browse through the adapter list, cleans-up 520 * each instance, unregisters iscsi transport name and finally driver will 521 * unregister itself with the cnic module 522 */ 523static void __exit bnx2i_mod_exit(void) 524{ 525 struct bnx2i_hba *hba; 526 527 mutex_lock(&bnx2i_dev_lock); 528 while (!list_empty(&adapter_list)) { 529 hba = list_entry(adapter_list.next, struct bnx2i_hba, link); 530 list_del(&hba->link); 531 adapter_count--; 532 533 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 534 bnx2i_chip_cleanup(hba); 535 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 536 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 537 } 538 539 bnx2i_free_hba(hba); 540 } 541 mutex_unlock(&bnx2i_dev_lock); 542 543 cpuhp_remove_state(bnx2i_online_state); 544 545 iscsi_unregister_transport(&bnx2i_iscsi_transport); 546 cnic_unregister_driver(CNIC_ULP_ISCSI); 547} 548 549module_init(bnx2i_mod_init); 550module_exit(bnx2i_mod_exit); 551