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 "2.1.0" 21 #define DRV_MODULE_RELDATE "Dec 06, 2009" 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>"); 29 MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709 iSCSI Driver"); 30 MODULE_LICENSE("GPL"); 31 MODULE_VERSION(DRV_MODULE_VERSION); 32 33 static DEFINE_MUTEX(bnx2i_dev_lock); 34 35 unsigned int event_coal_min = 24; 36 module_param(event_coal_min, int, 0664); 37 MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands"); 38 39 unsigned int event_coal_div = 1; 40 module_param(event_coal_div, int, 0664); 41 MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor"); 42 43 unsigned int en_tcp_dack = 1; 44 module_param(en_tcp_dack, int, 0664); 45 MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK"); 46 47 unsigned int error_mask1 = 0x00; 48 module_param(error_mask1, int, 0664); 49 MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1"); 50 51 unsigned int error_mask2 = 0x00; 52 module_param(error_mask2, int, 0664); 53 MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2"); 54 55 unsigned int sq_size; 56 module_param(sq_size, int, 0664); 57 MODULE_PARM_DESC(sq_size, "Configure SQ size"); 58 59 unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT; 60 module_param(rq_size, int, 0664); 61 MODULE_PARM_DESC(rq_size, "Configure RQ size"); 62 63 u64 iscsi_error_mask = 0x00; 64 65 static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) ; 66 67 68 /** 69 * bnx2i_identify_device - identifies NetXtreme II device type 70 * @hba: Adapter structure pointer 71 * 72 * This function identifies the NX2 device type and sets appropriate 73 * queue mailbox register access method, 5709 requires driver to 74 * access MBOX regs using *bin* mode 75 */ 76 void bnx2i_identify_device(struct bnx2i_hba *hba) 77 { 78 hba->cnic_dev_type = 0; 79 if ((hba->pci_did == PCI_DEVICE_ID_NX2_5706) || 80 (hba->pci_did == PCI_DEVICE_ID_NX2_5706S)) 81 set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type); 82 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5708) || 83 (hba->pci_did == PCI_DEVICE_ID_NX2_5708S)) 84 set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type); 85 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5709) || 86 (hba->pci_did == PCI_DEVICE_ID_NX2_5709S)) { 87 set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type); 88 hba->mail_queue_access = BNX2I_MQ_BIN_MODE; 89 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_57710 || 90 hba->pci_did == PCI_DEVICE_ID_NX2_57711 || 91 hba->pci_did == PCI_DEVICE_ID_NX2_57711E) 92 set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type); 93 else 94 printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n", 95 hba->pci_did); 96 } 97 98 99 /** 100 * get_adapter_list_head - returns head of adapter list 101 */ 102 struct bnx2i_hba *get_adapter_list_head(void) 103 { 104 struct bnx2i_hba *hba = NULL; 105 struct bnx2i_hba *tmp_hba; 106 107 if (!adapter_count) 108 goto hba_not_found; 109 110 mutex_lock(&bnx2i_dev_lock); 111 list_for_each_entry(tmp_hba, &adapter_list, link) { 112 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) { 113 hba = tmp_hba; 114 break; 115 } 116 } 117 mutex_unlock(&bnx2i_dev_lock); 118 hba_not_found: 119 return hba; 120 } 121 122 123 /** 124 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance 125 * @cnic: pointer to cnic device instance 126 * 127 */ 128 struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic) 129 { 130 struct bnx2i_hba *hba, *temp; 131 132 mutex_lock(&bnx2i_dev_lock); 133 list_for_each_entry_safe(hba, temp, &adapter_list, link) { 134 if (hba->cnic == cnic) { 135 mutex_unlock(&bnx2i_dev_lock); 136 return hba; 137 } 138 } 139 mutex_unlock(&bnx2i_dev_lock); 140 return NULL; 141 } 142 143 144 /** 145 * bnx2i_start - cnic callback to initialize & start adapter instance 146 * @handle: transparent handle pointing to adapter structure 147 * 148 * This function maps adapter structure to pcidev structure and initiates 149 * firmware handshake to enable/initialize on chip iscsi components 150 * This bnx2i - cnic interface api callback is issued after following 151 * 2 conditions are met - 152 * a) underlying network interface is up (marked by event 'NETDEV_UP' 153 * from netdev 154 * b) bnx2i adapter instance is registered 155 */ 156 void bnx2i_start(void *handle) 157 { 158 #define BNX2I_INIT_POLL_TIME (1000 / HZ) 159 struct bnx2i_hba *hba = handle; 160 int i = HZ; 161 162 bnx2i_send_fw_iscsi_init_msg(hba); 163 while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--) 164 msleep(BNX2I_INIT_POLL_TIME); 165 } 166 167 168 /** 169 * bnx2i_stop - cnic callback to shutdown adapter instance 170 * @handle: transparent handle pointing to adapter structure 171 * 172 * driver checks if adapter is already in shutdown mode, if not start 173 * the shutdown process 174 */ 175 void bnx2i_stop(void *handle) 176 { 177 struct bnx2i_hba *hba = handle; 178 179 /* check if cleanup happened in GOING_DOWN context */ 180 clear_bit(ADAPTER_STATE_UP, &hba->adapter_state); 181 if (!test_and_clear_bit(ADAPTER_STATE_GOING_DOWN, 182 &hba->adapter_state)) 183 iscsi_host_for_each_session(hba->shost, 184 bnx2i_drop_session); 185 } 186 187 /** 188 * bnx2i_register_device - register bnx2i adapter instance with the cnic driver 189 * @hba: Adapter instance to register 190 * 191 * registers bnx2i adapter instance with the cnic driver while holding the 192 * adapter structure lock 193 */ 194 void bnx2i_register_device(struct bnx2i_hba *hba) 195 { 196 int rc; 197 198 if (test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) || 199 test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 200 return; 201 } 202 203 rc = hba->cnic->register_device(hba->cnic, CNIC_ULP_ISCSI, hba); 204 205 if (!rc) 206 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 207 } 208 209 210 /** 211 * bnx2i_reg_dev_all - registers all adapter instances with the cnic driver 212 * 213 * registers all bnx2i adapter instances with the cnic driver while holding 214 * the global resource lock 215 */ 216 void bnx2i_reg_dev_all(void) 217 { 218 struct bnx2i_hba *hba, *temp; 219 220 mutex_lock(&bnx2i_dev_lock); 221 list_for_each_entry_safe(hba, temp, &adapter_list, link) 222 bnx2i_register_device(hba); 223 mutex_unlock(&bnx2i_dev_lock); 224 } 225 226 227 /** 228 * bnx2i_unreg_one_device - unregister adapter instance with the cnic driver 229 * @hba: Adapter instance to unregister 230 * 231 * registers bnx2i adapter instance with the cnic driver while holding 232 * the adapter structure lock 233 */ 234 static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) 235 { 236 if (hba->ofld_conns_active || 237 !test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) || 238 test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state)) 239 return; 240 241 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 242 243 /* ep_disconnect could come before NETDEV_DOWN, driver won't 244 * see NETDEV_DOWN as it already unregistered itself. 245 */ 246 hba->adapter_state = 0; 247 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 248 } 249 250 /** 251 * bnx2i_unreg_dev_all - unregisters all bnx2i instances with the cnic driver 252 * 253 * unregisters all bnx2i adapter instances with the cnic driver while holding 254 * the global resource lock 255 */ 256 void bnx2i_unreg_dev_all(void) 257 { 258 struct bnx2i_hba *hba, *temp; 259 260 mutex_lock(&bnx2i_dev_lock); 261 list_for_each_entry_safe(hba, temp, &adapter_list, link) 262 bnx2i_unreg_one_device(hba); 263 mutex_unlock(&bnx2i_dev_lock); 264 } 265 266 267 /** 268 * bnx2i_init_one - initialize an adapter instance and allocate memory resources 269 * @hba: bnx2i adapter instance 270 * @cnic: cnic device handle 271 * 272 * Global resource lock is held during critical sections below. This routine is 273 * called from either cnic_register_driver() or device hot plug context and 274 * and does majority of device specific initialization 275 */ 276 static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) 277 { 278 int rc; 279 280 mutex_lock(&bnx2i_dev_lock); 281 rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba); 282 if (!rc) { 283 hba->age++; 284 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 285 list_add_tail(&hba->link, &adapter_list); 286 adapter_count++; 287 } else if (rc == -EBUSY) /* duplicate registration */ 288 printk(KERN_ALERT "bnx2i, duplicate registration" 289 "hba=%p, cnic=%p\n", hba, cnic); 290 else if (rc == -EAGAIN) 291 printk(KERN_ERR "bnx2i, driver not registered\n"); 292 else if (rc == -EINVAL) 293 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI); 294 else 295 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc); 296 297 mutex_unlock(&bnx2i_dev_lock); 298 299 return rc; 300 } 301 302 303 /** 304 * bnx2i_ulp_init - initialize an adapter instance 305 * @dev: cnic device handle 306 * 307 * Called from cnic_register_driver() context to initialize all enumerated 308 * cnic devices. This routine allocate adapter structure and other 309 * device specific resources. 310 */ 311 void bnx2i_ulp_init(struct cnic_dev *dev) 312 { 313 struct bnx2i_hba *hba; 314 315 /* Allocate a HBA structure for this device */ 316 hba = bnx2i_alloc_hba(dev); 317 if (!hba) { 318 printk(KERN_ERR "bnx2i init: hba initialization failed\n"); 319 return; 320 } 321 322 /* Get PCI related information and update hba struct members */ 323 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 324 if (bnx2i_init_one(hba, dev)) { 325 printk(KERN_ERR "bnx2i - hba %p init failed\n", hba); 326 bnx2i_free_hba(hba); 327 } else 328 hba->cnic = dev; 329 } 330 331 332 /** 333 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources 334 * @dev: cnic device handle 335 * 336 */ 337 void bnx2i_ulp_exit(struct cnic_dev *dev) 338 { 339 struct bnx2i_hba *hba; 340 341 hba = bnx2i_find_hba_for_cnic(dev); 342 if (!hba) { 343 printk(KERN_INFO "bnx2i_ulp_exit: hba not " 344 "found, dev 0x%p\n", dev); 345 return; 346 } 347 mutex_lock(&bnx2i_dev_lock); 348 list_del_init(&hba->link); 349 adapter_count--; 350 351 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 352 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 353 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 354 } 355 mutex_unlock(&bnx2i_dev_lock); 356 357 bnx2i_free_hba(hba); 358 } 359 360 361 /** 362 * bnx2i_mod_init - module init entry point 363 * 364 * initialize any driver wide global data structures such as endpoint pool, 365 * tcp port manager/queue, sysfs. finally driver will register itself 366 * with the cnic module 367 */ 368 static int __init bnx2i_mod_init(void) 369 { 370 int err; 371 372 printk(KERN_INFO "%s", version); 373 374 if (sq_size && !is_power_of_2(sq_size)) 375 sq_size = roundup_pow_of_two(sq_size); 376 377 mutex_init(&bnx2i_dev_lock); 378 379 bnx2i_scsi_xport_template = 380 iscsi_register_transport(&bnx2i_iscsi_transport); 381 if (!bnx2i_scsi_xport_template) { 382 printk(KERN_ERR "Could not register bnx2i transport.\n"); 383 err = -ENOMEM; 384 goto out; 385 } 386 387 err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb); 388 if (err) { 389 printk(KERN_ERR "Could not register bnx2i cnic driver.\n"); 390 goto unreg_xport; 391 } 392 393 return 0; 394 395 unreg_xport: 396 iscsi_unregister_transport(&bnx2i_iscsi_transport); 397 out: 398 return err; 399 } 400 401 402 /** 403 * bnx2i_mod_exit - module cleanup/exit entry point 404 * 405 * Global resource lock and host adapter lock is held during critical sections 406 * in this function. Driver will browse through the adapter list, cleans-up 407 * each instance, unregisters iscsi transport name and finally driver will 408 * unregister itself with the cnic module 409 */ 410 static void __exit bnx2i_mod_exit(void) 411 { 412 struct bnx2i_hba *hba; 413 414 mutex_lock(&bnx2i_dev_lock); 415 while (!list_empty(&adapter_list)) { 416 hba = list_entry(adapter_list.next, struct bnx2i_hba, link); 417 list_del(&hba->link); 418 adapter_count--; 419 420 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 421 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 422 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 423 } 424 425 bnx2i_free_hba(hba); 426 } 427 mutex_unlock(&bnx2i_dev_lock); 428 429 iscsi_unregister_transport(&bnx2i_iscsi_transport); 430 cnic_unregister_driver(CNIC_ULP_ISCSI); 431 } 432 433 module_init(bnx2i_mod_init); 434 module_exit(bnx2i_mod_exit); 435