1 /* bnx2i.c: Broadcom NetXtreme II iSCSI driver. 2 * 3 * Copyright (c) 2006 - 2010 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 "2.6.2.2" 22 #define DRV_MODULE_RELDATE "Nov 23, 2010" 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" 33 " 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 = 1; 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, int, 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, int, 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 70 /** 71 * bnx2i_identify_device - identifies NetXtreme II device type 72 * @hba: Adapter structure pointer 73 * 74 * This function identifies the NX2 device type and sets appropriate 75 * queue mailbox register access method, 5709 requires driver to 76 * access MBOX regs using *bin* mode 77 */ 78 void bnx2i_identify_device(struct bnx2i_hba *hba) 79 { 80 hba->cnic_dev_type = 0; 81 if ((hba->pci_did == PCI_DEVICE_ID_NX2_5706) || 82 (hba->pci_did == PCI_DEVICE_ID_NX2_5706S)) 83 set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type); 84 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5708) || 85 (hba->pci_did == PCI_DEVICE_ID_NX2_5708S)) 86 set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type); 87 else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5709) || 88 (hba->pci_did == PCI_DEVICE_ID_NX2_5709S)) { 89 set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type); 90 hba->mail_queue_access = BNX2I_MQ_BIN_MODE; 91 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_57710 || 92 hba->pci_did == PCI_DEVICE_ID_NX2_57711 || 93 hba->pci_did == PCI_DEVICE_ID_NX2_57711E) 94 set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type); 95 else 96 printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n", 97 hba->pci_did); 98 } 99 100 101 /** 102 * get_adapter_list_head - returns head of adapter list 103 */ 104 struct bnx2i_hba *get_adapter_list_head(void) 105 { 106 struct bnx2i_hba *hba = NULL; 107 struct bnx2i_hba *tmp_hba; 108 109 if (!adapter_count) 110 goto hba_not_found; 111 112 mutex_lock(&bnx2i_dev_lock); 113 list_for_each_entry(tmp_hba, &adapter_list, link) { 114 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) { 115 hba = tmp_hba; 116 break; 117 } 118 } 119 mutex_unlock(&bnx2i_dev_lock); 120 hba_not_found: 121 return hba; 122 } 123 124 125 /** 126 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance 127 * @cnic: pointer to cnic device instance 128 * 129 */ 130 struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic) 131 { 132 struct bnx2i_hba *hba, *temp; 133 134 mutex_lock(&bnx2i_dev_lock); 135 list_for_each_entry_safe(hba, temp, &adapter_list, link) { 136 if (hba->cnic == cnic) { 137 mutex_unlock(&bnx2i_dev_lock); 138 return hba; 139 } 140 } 141 mutex_unlock(&bnx2i_dev_lock); 142 return NULL; 143 } 144 145 146 /** 147 * bnx2i_start - cnic callback to initialize & start adapter instance 148 * @handle: transparent handle pointing to adapter structure 149 * 150 * This function maps adapter structure to pcidev structure and initiates 151 * firmware handshake to enable/initialize on chip iscsi components 152 * This bnx2i - cnic interface api callback is issued after following 153 * 2 conditions are met - 154 * a) underlying network interface is up (marked by event 'NETDEV_UP' 155 * from netdev 156 * b) bnx2i adapter instance is registered 157 */ 158 void bnx2i_start(void *handle) 159 { 160 #define BNX2I_INIT_POLL_TIME (1000 / HZ) 161 struct bnx2i_hba *hba = handle; 162 int i = HZ; 163 164 bnx2i_send_fw_iscsi_init_msg(hba); 165 while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--) 166 msleep(BNX2I_INIT_POLL_TIME); 167 } 168 169 170 /** 171 * bnx2i_chip_cleanup - local routine to handle chip cleanup 172 * @hba: Adapter instance to register 173 * 174 * Driver checks if adapter still has any active connections before 175 * executing the cleanup process 176 */ 177 static void bnx2i_chip_cleanup(struct bnx2i_hba *hba) 178 { 179 struct bnx2i_endpoint *bnx2i_ep; 180 struct list_head *pos, *tmp; 181 182 if (hba->ofld_conns_active) { 183 /* Stage to force the disconnection 184 * This is the case where the daemon is either slow or 185 * not present 186 */ 187 printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active " 188 "connections\n", hba->netdev->name, 189 hba->ofld_conns_active); 190 mutex_lock(&hba->net_dev_lock); 191 list_for_each_safe(pos, tmp, &hba->ep_active_list) { 192 bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link); 193 /* Clean up the chip only */ 194 bnx2i_hw_ep_disconnect(bnx2i_ep); 195 bnx2i_ep->cm_sk = NULL; 196 } 197 mutex_unlock(&hba->net_dev_lock); 198 } 199 } 200 201 202 /** 203 * bnx2i_stop - cnic callback to shutdown adapter instance 204 * @handle: transparent handle pointing to adapter structure 205 * 206 * driver checks if adapter is already in shutdown mode, if not start 207 * the shutdown process 208 */ 209 void bnx2i_stop(void *handle) 210 { 211 struct bnx2i_hba *hba = handle; 212 int conns_active; 213 int wait_delay = 1 * HZ; 214 215 /* check if cleanup happened in GOING_DOWN context */ 216 if (!test_and_set_bit(ADAPTER_STATE_GOING_DOWN, 217 &hba->adapter_state)) { 218 iscsi_host_for_each_session(hba->shost, 219 bnx2i_drop_session); 220 wait_delay = hba->hba_shutdown_tmo; 221 } 222 /* Wait for inflight offload connection tasks to complete before 223 * proceeding. Forcefully terminate all connection recovery in 224 * progress at the earliest, either in bind(), send_pdu(LOGIN), 225 * or conn_start() 226 */ 227 wait_event_interruptible_timeout(hba->eh_wait, 228 (list_empty(&hba->ep_ofld_list) && 229 list_empty(&hba->ep_destroy_list)), 230 10 * HZ); 231 /* Wait for all endpoints to be torn down, Chip will be reset once 232 * control returns to network driver. So it is required to cleanup and 233 * release all connection resources before returning from this routine. 234 */ 235 while (hba->ofld_conns_active) { 236 conns_active = hba->ofld_conns_active; 237 wait_event_interruptible_timeout(hba->eh_wait, 238 (hba->ofld_conns_active != conns_active), 239 wait_delay); 240 if (hba->ofld_conns_active == conns_active) 241 break; 242 } 243 bnx2i_chip_cleanup(hba); 244 245 /* This flag should be cleared last so that ep_disconnect() gracefully 246 * cleans up connection context 247 */ 248 clear_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state); 249 clear_bit(ADAPTER_STATE_UP, &hba->adapter_state); 250 } 251 252 253 /** 254 * bnx2i_init_one - initialize an adapter instance and allocate memory resources 255 * @hba: bnx2i adapter instance 256 * @cnic: cnic device handle 257 * 258 * Global resource lock is held during critical sections below. This routine is 259 * called from either cnic_register_driver() or device hot plug context and 260 * and does majority of device specific initialization 261 */ 262 static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic) 263 { 264 int rc; 265 266 mutex_lock(&bnx2i_dev_lock); 267 hba->cnic = cnic; 268 rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba); 269 if (!rc) { 270 hba->age++; 271 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 272 list_add_tail(&hba->link, &adapter_list); 273 adapter_count++; 274 } else if (rc == -EBUSY) /* duplicate registration */ 275 printk(KERN_ALERT "bnx2i, duplicate registration" 276 "hba=%p, cnic=%p\n", hba, cnic); 277 else if (rc == -EAGAIN) 278 printk(KERN_ERR "bnx2i, driver not registered\n"); 279 else if (rc == -EINVAL) 280 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI); 281 else 282 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc); 283 284 mutex_unlock(&bnx2i_dev_lock); 285 286 return rc; 287 } 288 289 290 /** 291 * bnx2i_ulp_init - initialize an adapter instance 292 * @dev: cnic device handle 293 * 294 * Called from cnic_register_driver() context to initialize all enumerated 295 * cnic devices. This routine allocate adapter structure and other 296 * device specific resources. 297 */ 298 void bnx2i_ulp_init(struct cnic_dev *dev) 299 { 300 struct bnx2i_hba *hba; 301 302 /* Allocate a HBA structure for this device */ 303 hba = bnx2i_alloc_hba(dev); 304 if (!hba) { 305 printk(KERN_ERR "bnx2i init: hba initialization failed\n"); 306 return; 307 } 308 309 /* Get PCI related information and update hba struct members */ 310 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 311 if (bnx2i_init_one(hba, dev)) { 312 printk(KERN_ERR "bnx2i - hba %p init failed\n", hba); 313 bnx2i_free_hba(hba); 314 } 315 } 316 317 318 /** 319 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources 320 * @dev: cnic device handle 321 * 322 */ 323 void bnx2i_ulp_exit(struct cnic_dev *dev) 324 { 325 struct bnx2i_hba *hba; 326 327 hba = bnx2i_find_hba_for_cnic(dev); 328 if (!hba) { 329 printk(KERN_INFO "bnx2i_ulp_exit: hba not " 330 "found, dev 0x%p\n", dev); 331 return; 332 } 333 mutex_lock(&bnx2i_dev_lock); 334 list_del_init(&hba->link); 335 adapter_count--; 336 337 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 338 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 339 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 340 } 341 mutex_unlock(&bnx2i_dev_lock); 342 343 bnx2i_free_hba(hba); 344 } 345 346 347 /** 348 * bnx2i_mod_init - module init entry point 349 * 350 * initialize any driver wide global data structures such as endpoint pool, 351 * tcp port manager/queue, sysfs. finally driver will register itself 352 * with the cnic module 353 */ 354 static int __init bnx2i_mod_init(void) 355 { 356 int err; 357 358 printk(KERN_INFO "%s", version); 359 360 if (sq_size && !is_power_of_2(sq_size)) 361 sq_size = roundup_pow_of_two(sq_size); 362 363 mutex_init(&bnx2i_dev_lock); 364 365 bnx2i_scsi_xport_template = 366 iscsi_register_transport(&bnx2i_iscsi_transport); 367 if (!bnx2i_scsi_xport_template) { 368 printk(KERN_ERR "Could not register bnx2i transport.\n"); 369 err = -ENOMEM; 370 goto out; 371 } 372 373 err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb); 374 if (err) { 375 printk(KERN_ERR "Could not register bnx2i cnic driver.\n"); 376 goto unreg_xport; 377 } 378 379 return 0; 380 381 unreg_xport: 382 iscsi_unregister_transport(&bnx2i_iscsi_transport); 383 out: 384 return err; 385 } 386 387 388 /** 389 * bnx2i_mod_exit - module cleanup/exit entry point 390 * 391 * Global resource lock and host adapter lock is held during critical sections 392 * in this function. Driver will browse through the adapter list, cleans-up 393 * each instance, unregisters iscsi transport name and finally driver will 394 * unregister itself with the cnic module 395 */ 396 static void __exit bnx2i_mod_exit(void) 397 { 398 struct bnx2i_hba *hba; 399 400 mutex_lock(&bnx2i_dev_lock); 401 while (!list_empty(&adapter_list)) { 402 hba = list_entry(adapter_list.next, struct bnx2i_hba, link); 403 list_del(&hba->link); 404 adapter_count--; 405 406 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) { 407 bnx2i_chip_cleanup(hba); 408 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI); 409 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic); 410 } 411 412 bnx2i_free_hba(hba); 413 } 414 mutex_unlock(&bnx2i_dev_lock); 415 416 iscsi_unregister_transport(&bnx2i_iscsi_transport); 417 cnic_unregister_driver(CNIC_ULP_ISCSI); 418 } 419 420 module_init(bnx2i_mod_init); 421 module_exit(bnx2i_mod_exit); 422