1 /* bnx2i.c: Broadcom NetXtreme II iSCSI driver. 2 * 3 * Copyright (c) 2006 - 2009 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 */ 13 14 #include "bnx2i.h" 15 16 static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list); 17 static u32 adapter_count; 18 19 #define DRV_MODULE_NAME "bnx2i" 20 #define DRV_MODULE_VERSION "2.1.3" 21 #define DRV_MODULE_RELDATE "Aug 10, 2010" 22 23 static char version[] __devinitdata = 24 "Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \ 25 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 26 27 28 MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com> and " 29 "Eddie Wai <eddie.wai@broadcom.com>"); 30 31 MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709/57710/57711" 32 " iSCSI Driver"); 33 MODULE_LICENSE("GPL"); 34 MODULE_VERSION(DRV_MODULE_VERSION); 35 36 static DEFINE_MUTEX(bnx2i_dev_lock); 37 38 unsigned int event_coal_min = 24; 39 module_param(event_coal_min, int, 0664); 40 MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands"); 41 42 unsigned int event_coal_div = 1; 43 module_param(event_coal_div, int, 0664); 44 MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor"); 45 46 unsigned int en_tcp_dack = 1; 47 module_param(en_tcp_dack, int, 0664); 48 MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK"); 49 50 unsigned int error_mask1 = 0x00; 51 module_param(error_mask1, int, 0664); 52 MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1"); 53 54 unsigned int error_mask2 = 0x00; 55 module_param(error_mask2, int, 0664); 56 MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2"); 57 58 unsigned int sq_size; 59 module_param(sq_size, int, 0664); 60 MODULE_PARM_DESC(sq_size, "Configure SQ size"); 61 62 unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT; 63 module_param(rq_size, int, 0664); 64 MODULE_PARM_DESC(rq_size, "Configure RQ size"); 65 66 u64 iscsi_error_mask = 0x00; 67 68 static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) ; 69 70 71 /** 72 * bnx2i_identify_device - identifies NetXtreme II device type 73 * @hba: Adapter structure pointer 74 * 75 * This function identifies the NX2 device type and sets appropriate 76 * queue mailbox register access method, 5709 requires driver to 77 * access MBOX regs using *bin* mode 78 */ 79 void bnx2i_identify_device(struct bnx2i_hba *hba) 80 { 81 hba->cnic_dev_type = 0; 82 if ((hba->pci_did == PCI_DEVICE_ID_NX2_5706) || 83 (hba->pci_did == PCI_DEVICE_ID_NX2_5706S)) 84 set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type); 85 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5708) || 86 (hba->pci_did == PCI_DEVICE_ID_NX2_5708S)) 87 set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type); 88 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5709) || 89 (hba->pci_did == PCI_DEVICE_ID_NX2_5709S)) { 90 set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type); 91 hba->mail_queue_access = BNX2I_MQ_BIN_MODE; 92 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_57710 || 93 hba->pci_did == PCI_DEVICE_ID_NX2_57711 || 94 hba->pci_did == PCI_DEVICE_ID_NX2_57711E) 95 set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type); 96 else 97 printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n", 98 hba->pci_did); 99 } 100 101 102 /** 103 * get_adapter_list_head - returns head of adapter list 104 */ 105 struct bnx2i_hba *get_adapter_list_head(void) 106 { 107 struct bnx2i_hba *hba = NULL; 108 struct bnx2i_hba *tmp_hba; 109 110 if (!adapter_count) 111 goto hba_not_found; 112 113 mutex_lock(&bnx2i_dev_lock); 114 list_for_each_entry(tmp_hba, &adapter_list, link) { 115 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) { 116 hba = tmp_hba; 117 break; 118 } 119 } 120 mutex_unlock(&bnx2i_dev_lock); 121 hba_not_found: 122 return hba; 123 } 124 125 126 /** 127 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance 128 * @cnic: pointer to cnic device instance 129 * 130 */ 131 struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic) 132 { 133 struct bnx2i_hba *hba, *temp; 134 135 mutex_lock(&bnx2i_dev_lock); 136 list_for_each_entry_safe(hba, temp, &adapter_list, link) { 137 if (hba->cnic == cnic) { 138 mutex_unlock(&bnx2i_dev_lock); 139 return hba; 140 } 141 } 142 mutex_unlock(&bnx2i_dev_lock); 143 return NULL; 144 } 145 146 147 /** 148 * bnx2i_start - cnic callback to initialize & start adapter instance 149 * @handle: transparent handle pointing to adapter structure 150 * 151 * This function maps adapter structure to pcidev structure and initiates 152 * firmware handshake to enable/initialize on chip iscsi components 153 * This bnx2i - cnic interface api callback is issued after following 154 * 2 conditions are met - 155 * a) underlying network interface is up (marked by event 'NETDEV_UP' 156 * from netdev 157 * b) bnx2i adapter instance is registered 158 */ 159 void bnx2i_start(void *handle) 160 { 161 #define BNX2I_INIT_POLL_TIME (1000 / HZ) 162 struct bnx2i_hba *hba = handle; 163 int i = HZ; 164 165 bnx2i_send_fw_iscsi_init_msg(hba); 166 while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--) 167 msleep(BNX2I_INIT_POLL_TIME); 168 } 169 170 171 /** 172 * bnx2i_chip_cleanup - local routine to handle chip cleanup 173 * @hba: Adapter instance to register 174 * 175 * Driver checks if adapter still has any active connections before 176 * executing the cleanup process 177 */ 178 static void bnx2i_chip_cleanup(struct bnx2i_hba *hba) 179 { 180 struct bnx2i_endpoint *bnx2i_ep; 181 struct list_head *pos, *tmp; 182 183 if (hba->ofld_conns_active) { 184 /* Stage to force the disconnection 185 * This is the case where the daemon is either slow or 186 * not present 187 */ 188 printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active " 189 "connections\n", hba->netdev->name, 190 hba->ofld_conns_active); 191 mutex_lock(&hba->net_dev_lock); 192 list_for_each_safe(pos, tmp, &hba->ep_active_list) { 193 bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link); 194 /* Clean up the chip only */ 195 bnx2i_hw_ep_disconnect(bnx2i_ep); 196 bnx2i_ep->cm_sk = NULL; 197 } 198 mutex_unlock(&hba->net_dev_lock); 199 } 200 } 201 202 203 /** 204 * bnx2i_stop - cnic callback to shutdown adapter instance 205 * @handle: transparent handle pointing to adapter structure 206 * 207 * driver checks if adapter is already in shutdown mode, if not start 208 * the shutdown process 209 */ 210 void bnx2i_stop(void *handle) 211 { 212 struct bnx2i_hba *hba = handle; 213 int conns_active; 214 215 /* check if cleanup happened in GOING_DOWN context */ 216 if (!test_and_clear_bit(ADAPTER_STATE_GOING_DOWN, 217 &hba->adapter_state)) 218 iscsi_host_for_each_session(hba->shost, 219 bnx2i_drop_session); 220 221 /* Wait for all endpoints to be torn down, Chip will be reset once 222 * control returns to network driver. So it is required to cleanup and 223 * release all connection resources before returning from this routine. 224 */ 225 while (hba->ofld_conns_active) { 226 conns_active = hba->ofld_conns_active; 227 wait_event_interruptible_timeout(hba->eh_wait, 228 (hba->ofld_conns_active != conns_active), 229 hba->hba_shutdown_tmo); 230 if (hba->ofld_conns_active == conns_active) 231 break; 232 } 233 bnx2i_chip_cleanup(hba); 234 235 /* This flag should be cleared last so that ep_disconnect() gracefully 236 * cleans up connection context 237 */ 238 clear_bit(ADAPTER_STATE_UP, &hba->adapter_state); 239 } 240 241 /** 242 * bnx2i_register_device - register bnx2i adapter instance with the cnic driver 243 * @hba: Adapter instance to register 244 * 245 * registers bnx2i adapter instance with the cnic driver while holding the 246 * adapter structure lock 247 */ 248 void bnx2i_register_device(struct bnx2i_hba *hba) 249 { 250 int rc; 251 252 if (test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) || 253 test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 254 return; 255 } 256 257 rc = hba->cnic->register_device(hba->cnic, CNIC_ULP_ISCSI, hba); 258 259 if (!rc) 260 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 261 } 262 263 264 /** 265 * bnx2i_reg_dev_all - registers all adapter instances with the cnic driver 266 * 267 * registers all bnx2i adapter instances with the cnic driver while holding 268 * the global resource lock 269 */ 270 void bnx2i_reg_dev_all(void) 271 { 272 struct bnx2i_hba *hba, *temp; 273 274 mutex_lock(&bnx2i_dev_lock); 275 list_for_each_entry_safe(hba, temp, &adapter_list, link) 276 bnx2i_register_device(hba); 277 mutex_unlock(&bnx2i_dev_lock); 278 } 279 280 281 /** 282 * bnx2i_unreg_one_device - unregister adapter instance with the cnic driver 283 * @hba: Adapter instance to unregister 284 * 285 * registers bnx2i adapter instance with the cnic driver while holding 286 * the adapter structure lock 287 */ 288 static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) 289 { 290 if (hba->ofld_conns_active || 291 !test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) || 292 test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state)) 293 return; 294 295 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 296 297 /* ep_disconnect could come before NETDEV_DOWN, driver won't 298 * see NETDEV_DOWN as it already unregistered itself. 299 */ 300 hba->adapter_state = 0; 301 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 302 } 303 304 /** 305 * bnx2i_unreg_dev_all - unregisters all bnx2i instances with the cnic driver 306 * 307 * unregisters all bnx2i adapter instances with the cnic driver while holding 308 * the global resource lock 309 */ 310 void bnx2i_unreg_dev_all(void) 311 { 312 struct bnx2i_hba *hba, *temp; 313 314 mutex_lock(&bnx2i_dev_lock); 315 list_for_each_entry_safe(hba, temp, &adapter_list, link) 316 bnx2i_unreg_one_device(hba); 317 mutex_unlock(&bnx2i_dev_lock); 318 } 319 320 321 /** 322 * bnx2i_init_one - initialize an adapter instance and allocate memory resources 323 * @hba: bnx2i adapter instance 324 * @cnic: cnic device handle 325 * 326 * Global resource lock is held during critical sections below. This routine is 327 * called from either cnic_register_driver() or device hot plug context and 328 * and does majority of device specific initialization 329 */ 330 static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) 331 { 332 int rc; 333 334 mutex_lock(&bnx2i_dev_lock); 335 hba->cnic = cnic; 336 rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba); 337 if (!rc) { 338 hba->age++; 339 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 340 list_add_tail(&hba->link, &adapter_list); 341 adapter_count++; 342 } else if (rc == -EBUSY) /* duplicate registration */ 343 printk(KERN_ALERT "bnx2i, duplicate registration" 344 "hba=%p, cnic=%p\n", hba, cnic); 345 else if (rc == -EAGAIN) 346 printk(KERN_ERR "bnx2i, driver not registered\n"); 347 else if (rc == -EINVAL) 348 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI); 349 else 350 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc); 351 352 mutex_unlock(&bnx2i_dev_lock); 353 354 return rc; 355 } 356 357 358 /** 359 * bnx2i_ulp_init - initialize an adapter instance 360 * @dev: cnic device handle 361 * 362 * Called from cnic_register_driver() context to initialize all enumerated 363 * cnic devices. This routine allocate adapter structure and other 364 * device specific resources. 365 */ 366 void bnx2i_ulp_init(struct cnic_dev *dev) 367 { 368 struct bnx2i_hba *hba; 369 370 /* Allocate a HBA structure for this device */ 371 hba = bnx2i_alloc_hba(dev); 372 if (!hba) { 373 printk(KERN_ERR "bnx2i init: hba initialization failed\n"); 374 return; 375 } 376 377 /* Get PCI related information and update hba struct members */ 378 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 379 if (bnx2i_init_one(hba, dev)) { 380 printk(KERN_ERR "bnx2i - hba %p init failed\n", hba); 381 bnx2i_free_hba(hba); 382 } 383 } 384 385 386 /** 387 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources 388 * @dev: cnic device handle 389 * 390 */ 391 void bnx2i_ulp_exit(struct cnic_dev *dev) 392 { 393 struct bnx2i_hba *hba; 394 395 hba = bnx2i_find_hba_for_cnic(dev); 396 if (!hba) { 397 printk(KERN_INFO "bnx2i_ulp_exit: hba not " 398 "found, dev 0x%p\n", dev); 399 return; 400 } 401 mutex_lock(&bnx2i_dev_lock); 402 list_del_init(&hba->link); 403 adapter_count--; 404 405 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 406 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 407 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 408 } 409 mutex_unlock(&bnx2i_dev_lock); 410 411 bnx2i_free_hba(hba); 412 } 413 414 415 /** 416 * bnx2i_mod_init - module init entry point 417 * 418 * initialize any driver wide global data structures such as endpoint pool, 419 * tcp port manager/queue, sysfs. finally driver will register itself 420 * with the cnic module 421 */ 422 static int __init bnx2i_mod_init(void) 423 { 424 int err; 425 426 printk(KERN_INFO "%s", version); 427 428 if (sq_size && !is_power_of_2(sq_size)) 429 sq_size = roundup_pow_of_two(sq_size); 430 431 mutex_init(&bnx2i_dev_lock); 432 433 bnx2i_scsi_xport_template = 434 iscsi_register_transport(&bnx2i_iscsi_transport); 435 if (!bnx2i_scsi_xport_template) { 436 printk(KERN_ERR "Could not register bnx2i transport.\n"); 437 err = -ENOMEM; 438 goto out; 439 } 440 441 err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb); 442 if (err) { 443 printk(KERN_ERR "Could not register bnx2i cnic driver.\n"); 444 goto unreg_xport; 445 } 446 447 return 0; 448 449 unreg_xport: 450 iscsi_unregister_transport(&bnx2i_iscsi_transport); 451 out: 452 return err; 453 } 454 455 456 /** 457 * bnx2i_mod_exit - module cleanup/exit entry point 458 * 459 * Global resource lock and host adapter lock is held during critical sections 460 * in this function. Driver will browse through the adapter list, cleans-up 461 * each instance, unregisters iscsi transport name and finally driver will 462 * unregister itself with the cnic module 463 */ 464 static void __exit bnx2i_mod_exit(void) 465 { 466 struct bnx2i_hba *hba; 467 468 mutex_lock(&bnx2i_dev_lock); 469 while (!list_empty(&adapter_list)) { 470 hba = list_entry(adapter_list.next, struct bnx2i_hba, link); 471 list_del(&hba->link); 472 adapter_count--; 473 474 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 475 bnx2i_chip_cleanup(hba); 476 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 477 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 478 } 479 480 bnx2i_free_hba(hba); 481 } 482 mutex_unlock(&bnx2i_dev_lock); 483 484 iscsi_unregister_transport(&bnx2i_iscsi_transport); 485 cnic_unregister_driver(CNIC_ULP_ISCSI); 486 } 487 488 module_init(bnx2i_mod_init); 489 module_exit(bnx2i_mod_exit); 490