drivers/scsi/bnx2i/bnx2i_init.c

   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);