1 /* bnx2i.c: Broadcom NetXtreme II iSCSI driver. 2 * 3 * Copyright (c) 2006 - 2012 Broadcom Corporation 4 * Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved. 5 * Copyright (c) 2007, 2008 Mike Christie 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation. 10 * 11 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com) 12 * Maintained by: Eddie Wai (eddie.wai@broadcom.com) 13 */ 14 15 #include "bnx2i.h" 16 17 static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list); 18 static u32 adapter_count; 19 20 #define DRV_MODULE_NAME "bnx2i" 21 #define DRV_MODULE_VERSION "2.7.2.2" 22 #define DRV_MODULE_RELDATE "Apr 25, 2012" 23 24 static char version[] __devinitdata = 25 "Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \ 26 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 27 28 29 MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com> and " 30 "Eddie Wai <eddie.wai@broadcom.com>"); 31 32 MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709/57710/57711/57712" 33 "/57800/57810/57840 iSCSI Driver"); 34 MODULE_LICENSE("GPL"); 35 MODULE_VERSION(DRV_MODULE_VERSION); 36 37 static DEFINE_MUTEX(bnx2i_dev_lock); 38 39 unsigned int event_coal_min = 24; 40 module_param(event_coal_min, int, 0664); 41 MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands"); 42 43 unsigned int event_coal_div = 2; 44 module_param(event_coal_div, int, 0664); 45 MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor"); 46 47 unsigned int en_tcp_dack = 1; 48 module_param(en_tcp_dack, int, 0664); 49 MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK"); 50 51 unsigned int error_mask1 = 0x00; 52 module_param(error_mask1, uint, 0664); 53 MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1"); 54 55 unsigned int error_mask2 = 0x00; 56 module_param(error_mask2, uint, 0664); 57 MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2"); 58 59 unsigned int sq_size; 60 module_param(sq_size, int, 0664); 61 MODULE_PARM_DESC(sq_size, "Configure SQ size"); 62 63 unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT; 64 module_param(rq_size, int, 0664); 65 MODULE_PARM_DESC(rq_size, "Configure RQ size"); 66 67 u64 iscsi_error_mask = 0x00; 68 69 DEFINE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu); 70 71 static int bnx2i_cpu_callback(struct notifier_block *nfb, 72 unsigned long action, void *hcpu); 73 /* notification function for CPU hotplug events */ 74 static struct notifier_block bnx2i_cpu_notifier = { 75 .notifier_call = bnx2i_cpu_callback, 76 }; 77 78 79 /** 80 * bnx2i_identify_device - identifies NetXtreme II device type 81 * @hba: Adapter structure pointer 82 * 83 * This function identifies the NX2 device type and sets appropriate 84 * queue mailbox register access method, 5709 requires driver to 85 * access MBOX regs using *bin* mode 86 */ 87 void bnx2i_identify_device(struct bnx2i_hba *hba) 88 { 89 hba->cnic_dev_type = 0; 90 if ((hba->pci_did == PCI_DEVICE_ID_NX2_5706) || 91 (hba->pci_did == PCI_DEVICE_ID_NX2_5706S)) 92 set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type); 93 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5708) || 94 (hba->pci_did == PCI_DEVICE_ID_NX2_5708S)) 95 set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type); 96 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5709) || 97 (hba->pci_did == PCI_DEVICE_ID_NX2_5709S)) { 98 set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type); 99 hba->mail_queue_access = BNX2I_MQ_BIN_MODE; 100 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_57710 || 101 hba->pci_did == PCI_DEVICE_ID_NX2_57711 || 102 hba->pci_did == PCI_DEVICE_ID_NX2_57711E || 103 hba->pci_did == PCI_DEVICE_ID_NX2_57712 || 104 hba->pci_did == PCI_DEVICE_ID_NX2_57712E || 105 hba->pci_did == PCI_DEVICE_ID_NX2_57800 || 106 hba->pci_did == PCI_DEVICE_ID_NX2_57800_MF || 107 hba->pci_did == PCI_DEVICE_ID_NX2_57800_VF || 108 hba->pci_did == PCI_DEVICE_ID_NX2_57810 || 109 hba->pci_did == PCI_DEVICE_ID_NX2_57810_MF || 110 hba->pci_did == PCI_DEVICE_ID_NX2_57810_VF || 111 hba->pci_did == PCI_DEVICE_ID_NX2_57840 || 112 hba->pci_did == PCI_DEVICE_ID_NX2_57840_MF || 113 hba->pci_did == PCI_DEVICE_ID_NX2_57840_VF) 114 set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type); 115 else 116 printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n", 117 hba->pci_did); 118 } 119 120 121 /** 122 * get_adapter_list_head - returns head of adapter list 123 */ 124 struct bnx2i_hba *get_adapter_list_head(void) 125 { 126 struct bnx2i_hba *hba = NULL; 127 struct bnx2i_hba *tmp_hba; 128 129 if (!adapter_count) 130 goto hba_not_found; 131 132 mutex_lock(&bnx2i_dev_lock); 133 list_for_each_entry(tmp_hba, &adapter_list, link) { 134 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) { 135 hba = tmp_hba; 136 break; 137 } 138 } 139 mutex_unlock(&bnx2i_dev_lock); 140 hba_not_found: 141 return hba; 142 } 143 144 145 /** 146 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance 147 * @cnic: pointer to cnic device instance 148 * 149 */ 150 struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic) 151 { 152 struct bnx2i_hba *hba, *temp; 153 154 mutex_lock(&bnx2i_dev_lock); 155 list_for_each_entry_safe(hba, temp, &adapter_list, link) { 156 if (hba->cnic == cnic) { 157 mutex_unlock(&bnx2i_dev_lock); 158 return hba; 159 } 160 } 161 mutex_unlock(&bnx2i_dev_lock); 162 return NULL; 163 } 164 165 166 /** 167 * bnx2i_start - cnic callback to initialize & start adapter instance 168 * @handle: transparent handle pointing to adapter structure 169 * 170 * This function maps adapter structure to pcidev structure and initiates 171 * firmware handshake to enable/initialize on chip iscsi components 172 * This bnx2i - cnic interface api callback is issued after following 173 * 2 conditions are met - 174 * a) underlying network interface is up (marked by event 'NETDEV_UP' 175 * from netdev 176 * b) bnx2i adapter instance is registered 177 */ 178 void bnx2i_start(void *handle) 179 { 180 #define BNX2I_INIT_POLL_TIME (1000 / HZ) 181 struct bnx2i_hba *hba = handle; 182 int i = HZ; 183 184 /* 185 * We should never register devices that don't support iSCSI 186 * (see bnx2i_init_one), so something is wrong if we try to 187 * start a iSCSI adapter on hardware with 0 supported iSCSI 188 * connections 189 */ 190 BUG_ON(!hba->cnic->max_iscsi_conn); 191 192 bnx2i_send_fw_iscsi_init_msg(hba); 193 while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--) 194 msleep(BNX2I_INIT_POLL_TIME); 195 } 196 197 198 /** 199 * bnx2i_chip_cleanup - local routine to handle chip cleanup 200 * @hba: Adapter instance to register 201 * 202 * Driver checks if adapter still has any active connections before 203 * executing the cleanup process 204 */ 205 static void bnx2i_chip_cleanup(struct bnx2i_hba *hba) 206 { 207 struct bnx2i_endpoint *bnx2i_ep; 208 struct list_head *pos, *tmp; 209 210 if (hba->ofld_conns_active) { 211 /* Stage to force the disconnection 212 * This is the case where the daemon is either slow or 213 * not present 214 */ 215 printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active " 216 "connections\n", hba->netdev->name, 217 hba->ofld_conns_active); 218 mutex_lock(&hba->net_dev_lock); 219 list_for_each_safe(pos, tmp, &hba->ep_active_list) { 220 bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link); 221 /* Clean up the chip only */ 222 bnx2i_hw_ep_disconnect(bnx2i_ep); 223 bnx2i_ep->cm_sk = NULL; 224 } 225 mutex_unlock(&hba->net_dev_lock); 226 } 227 } 228 229 230 /** 231 * bnx2i_stop - cnic callback to shutdown adapter instance 232 * @handle: transparent handle pointing to adapter structure 233 * 234 * driver checks if adapter is already in shutdown mode, if not start 235 * the shutdown process 236 */ 237 void bnx2i_stop(void *handle) 238 { 239 struct bnx2i_hba *hba = handle; 240 int conns_active; 241 int wait_delay = 1 * HZ; 242 243 /* check if cleanup happened in GOING_DOWN context */ 244 if (!test_and_set_bit(ADAPTER_STATE_GOING_DOWN, 245 &hba->adapter_state)) { 246 iscsi_host_for_each_session(hba->shost, 247 bnx2i_drop_session); 248 wait_delay = hba->hba_shutdown_tmo; 249 } 250 /* Wait for inflight offload connection tasks to complete before 251 * proceeding. Forcefully terminate all connection recovery in 252 * progress at the earliest, either in bind(), send_pdu(LOGIN), 253 * or conn_start() 254 */ 255 wait_event_interruptible_timeout(hba->eh_wait, 256 (list_empty(&hba->ep_ofld_list) && 257 list_empty(&hba->ep_destroy_list)), 258 2 * HZ); 259 /* Wait for all endpoints to be torn down, Chip will be reset once 260 * control returns to network driver. So it is required to cleanup and 261 * release all connection resources before returning from this routine. 262 */ 263 while (hba->ofld_conns_active) { 264 conns_active = hba->ofld_conns_active; 265 wait_event_interruptible_timeout(hba->eh_wait, 266 (hba->ofld_conns_active != conns_active), 267 wait_delay); 268 if (hba->ofld_conns_active == conns_active) 269 break; 270 } 271 bnx2i_chip_cleanup(hba); 272 273 /* This flag should be cleared last so that ep_disconnect() gracefully 274 * cleans up connection context 275 */ 276 clear_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state); 277 clear_bit(ADAPTER_STATE_UP, &hba->adapter_state); 278 } 279 280 281 /** 282 * bnx2i_init_one - initialize an adapter instance and allocate memory resources 283 * @hba: bnx2i adapter instance 284 * @cnic: cnic device handle 285 * 286 * Global resource lock is held during critical sections below. This routine is 287 * called from either cnic_register_driver() or device hot plug context and 288 * and does majority of device specific initialization 289 */ 290 static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) 291 { 292 int rc; 293 294 mutex_lock(&bnx2i_dev_lock); 295 if (!cnic->max_iscsi_conn) { 296 printk(KERN_ALERT "bnx2i: dev %s does not support " 297 "iSCSI\n", hba->netdev->name); 298 rc = -EOPNOTSUPP; 299 goto out; 300 } 301 302 hba->cnic = cnic; 303 rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba); 304 if (!rc) { 305 hba->age++; 306 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 307 list_add_tail(&hba->link, &adapter_list); 308 adapter_count++; 309 } else if (rc == -EBUSY) /* duplicate registration */ 310 printk(KERN_ALERT "bnx2i, duplicate registration" 311 "hba=%p, cnic=%p\n", hba, cnic); 312 else if (rc == -EAGAIN) 313 printk(KERN_ERR "bnx2i, driver not registered\n"); 314 else if (rc == -EINVAL) 315 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI); 316 else 317 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc); 318 319 out: 320 mutex_unlock(&bnx2i_dev_lock); 321 322 return rc; 323 } 324 325 326 /** 327 * bnx2i_ulp_init - initialize an adapter instance 328 * @dev: cnic device handle 329 * 330 * Called from cnic_register_driver() context to initialize all enumerated 331 * cnic devices. This routine allocate adapter structure and other 332 * device specific resources. 333 */ 334 void bnx2i_ulp_init(struct cnic_dev *dev) 335 { 336 struct bnx2i_hba *hba; 337 338 /* Allocate a HBA structure for this device */ 339 hba = bnx2i_alloc_hba(dev); 340 if (!hba) { 341 printk(KERN_ERR "bnx2i init: hba initialization failed\n"); 342 return; 343 } 344 345 /* Get PCI related information and update hba struct members */ 346 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 347 if (bnx2i_init_one(hba, dev)) { 348 printk(KERN_ERR "bnx2i - hba %p init failed\n", hba); 349 bnx2i_free_hba(hba); 350 } 351 } 352 353 354 /** 355 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources 356 * @dev: cnic device handle 357 * 358 */ 359 void bnx2i_ulp_exit(struct cnic_dev *dev) 360 { 361 struct bnx2i_hba *hba; 362 363 hba = bnx2i_find_hba_for_cnic(dev); 364 if (!hba) { 365 printk(KERN_INFO "bnx2i_ulp_exit: hba not " 366 "found, dev 0x%p\n", dev); 367 return; 368 } 369 mutex_lock(&bnx2i_dev_lock); 370 list_del_init(&hba->link); 371 adapter_count--; 372 373 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 374 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 375 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 376 } 377 mutex_unlock(&bnx2i_dev_lock); 378 379 bnx2i_free_hba(hba); 380 } 381 382 383 /** 384 * bnx2i_percpu_thread_create - Create a receive thread for an 385 * online CPU 386 * 387 * @cpu: cpu index for the online cpu 388 */ 389 static void bnx2i_percpu_thread_create(unsigned int cpu) 390 { 391 struct bnx2i_percpu_s *p; 392 struct task_struct *thread; 393 394 p = &per_cpu(bnx2i_percpu, cpu); 395 396 thread = kthread_create_on_node(bnx2i_percpu_io_thread, (void *)p, 397 cpu_to_node(cpu), 398 "bnx2i_thread/%d", cpu); 399 /* bind thread to the cpu */ 400 if (likely(!IS_ERR(thread))) { 401 kthread_bind(thread, cpu); 402 p->iothread = thread; 403 wake_up_process(thread); 404 } 405 } 406 407 408 static void bnx2i_percpu_thread_destroy(unsigned int cpu) 409 { 410 struct bnx2i_percpu_s *p; 411 struct task_struct *thread; 412 struct bnx2i_work *work, *tmp; 413 414 /* Prevent any new work from being queued for this CPU */ 415 p = &per_cpu(bnx2i_percpu, cpu); 416 spin_lock_bh(&p->p_work_lock); 417 thread = p->iothread; 418 p->iothread = NULL; 419 420 /* Free all work in the list */ 421 list_for_each_entry_safe(work, tmp, &p->work_list, list) { 422 list_del_init(&work->list); 423 bnx2i_process_scsi_cmd_resp(work->session, 424 work->bnx2i_conn, &work->cqe); 425 kfree(work); 426 } 427 428 spin_unlock_bh(&p->p_work_lock); 429 if (thread) 430 kthread_stop(thread); 431 } 432 433 434 /** 435 * bnx2i_cpu_callback - Handler for CPU hotplug events 436 * 437 * @nfb: The callback data block 438 * @action: The event triggering the callback 439 * @hcpu: The index of the CPU that the event is for 440 * 441 * This creates or destroys per-CPU data for iSCSI 442 * 443 * Returns NOTIFY_OK always. 444 */ 445 static int bnx2i_cpu_callback(struct notifier_block *nfb, 446 unsigned long action, void *hcpu) 447 { 448 unsigned cpu = (unsigned long)hcpu; 449 450 switch (action) { 451 case CPU_ONLINE: 452 case CPU_ONLINE_FROZEN: 453 printk(KERN_INFO "bnx2i: CPU %x online: Create Rx thread\n", 454 cpu); 455 bnx2i_percpu_thread_create(cpu); 456 break; 457 case CPU_DEAD: 458 case CPU_DEAD_FROZEN: 459 printk(KERN_INFO "CPU %x offline: Remove Rx thread\n", cpu); 460 bnx2i_percpu_thread_destroy(cpu); 461 break; 462 default: 463 break; 464 } 465 return NOTIFY_OK; 466 } 467 468 469 /** 470 * bnx2i_mod_init - module init entry point 471 * 472 * initialize any driver wide global data structures such as endpoint pool, 473 * tcp port manager/queue, sysfs. finally driver will register itself 474 * with the cnic module 475 */ 476 static int __init bnx2i_mod_init(void) 477 { 478 int err; 479 unsigned cpu = 0; 480 struct bnx2i_percpu_s *p; 481 482 printk(KERN_INFO "%s", version); 483 484 if (sq_size && !is_power_of_2(sq_size)) 485 sq_size = roundup_pow_of_two(sq_size); 486 487 mutex_init(&bnx2i_dev_lock); 488 489 bnx2i_scsi_xport_template = 490 iscsi_register_transport(&bnx2i_iscsi_transport); 491 if (!bnx2i_scsi_xport_template) { 492 printk(KERN_ERR "Could not register bnx2i transport.\n"); 493 err = -ENOMEM; 494 goto out; 495 } 496 497 err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb); 498 if (err) { 499 printk(KERN_ERR "Could not register bnx2i cnic driver.\n"); 500 goto unreg_xport; 501 } 502 503 /* Create percpu kernel threads to handle iSCSI I/O completions */ 504 for_each_possible_cpu(cpu) { 505 p = &per_cpu(bnx2i_percpu, cpu); 506 INIT_LIST_HEAD(&p->work_list); 507 spin_lock_init(&p->p_work_lock); 508 p->iothread = NULL; 509 } 510 511 for_each_online_cpu(cpu) 512 bnx2i_percpu_thread_create(cpu); 513 514 /* Initialize per CPU interrupt thread */ 515 register_hotcpu_notifier(&bnx2i_cpu_notifier); 516 517 return 0; 518 519 unreg_xport: 520 iscsi_unregister_transport(&bnx2i_iscsi_transport); 521 out: 522 return err; 523 } 524 525 526 /** 527 * bnx2i_mod_exit - module cleanup/exit entry point 528 * 529 * Global resource lock and host adapter lock is held during critical sections 530 * in this function. Driver will browse through the adapter list, cleans-up 531 * each instance, unregisters iscsi transport name and finally driver will 532 * unregister itself with the cnic module 533 */ 534 static void __exit bnx2i_mod_exit(void) 535 { 536 struct bnx2i_hba *hba; 537 unsigned cpu = 0; 538 539 mutex_lock(&bnx2i_dev_lock); 540 while (!list_empty(&adapter_list)) { 541 hba = list_entry(adapter_list.next, struct bnx2i_hba, link); 542 list_del(&hba->link); 543 adapter_count--; 544 545 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 546 bnx2i_chip_cleanup(hba); 547 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 548 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 549 } 550 551 bnx2i_free_hba(hba); 552 } 553 mutex_unlock(&bnx2i_dev_lock); 554 555 unregister_hotcpu_notifier(&bnx2i_cpu_notifier); 556 557 for_each_online_cpu(cpu) 558 bnx2i_percpu_thread_destroy(cpu); 559 560 iscsi_unregister_transport(&bnx2i_iscsi_transport); 561 cnic_unregister_driver(CNIC_ULP_ISCSI); 562 } 563 564 module_init(bnx2i_mod_init); 565 module_exit(bnx2i_mod_exit); 566