satip-axe/kernel/drivers/scsi/bnx2i/bnx2i_init.c

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/* bnx2i.c: Broadcom NetXtreme II iSCSI driver.
*
* Copyright (c) 2006 - 2009 Broadcom Corporation
* Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved.
* Copyright (c) 2007, 2008 Mike Christie
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*
* Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
*/
#include "bnx2i.h"
static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list);
static u32 adapter_count;
#define DRV_MODULE_NAME "bnx2i"
#define DRV_MODULE_VERSION "2.0.1e"
#define DRV_MODULE_RELDATE "June 22, 2009"
static char version[] __devinitdata =
"Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \
" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com>");
MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709 iSCSI Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
static DEFINE_MUTEX(bnx2i_dev_lock);
unsigned int event_coal_div = 1;
module_param(event_coal_div, int, 0664);
MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor");
unsigned int en_tcp_dack = 1;
module_param(en_tcp_dack, int, 0664);
MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK");
unsigned int error_mask1 = 0x00;
module_param(error_mask1, int, 0664);
MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1");
unsigned int error_mask2 = 0x00;
module_param(error_mask2, int, 0664);
MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2");
unsigned int sq_size;
module_param(sq_size, int, 0664);
MODULE_PARM_DESC(sq_size, "Configure SQ size");
unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT;
module_param(rq_size, int, 0664);
MODULE_PARM_DESC(rq_size, "Configure RQ size");
u64 iscsi_error_mask = 0x00;
static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) ;
/**
* bnx2i_identify_device - identifies NetXtreme II device type
* @hba: Adapter structure pointer
*
* This function identifies the NX2 device type and sets appropriate
* queue mailbox register access method, 5709 requires driver to
* access MBOX regs using *bin* mode
*/
void bnx2i_identify_device(struct bnx2i_hba *hba)
{
hba->cnic_dev_type = 0;
if ((hba->pci_did == PCI_DEVICE_ID_NX2_5706) ||
(hba->pci_did == PCI_DEVICE_ID_NX2_5706S))
set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type);
else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5708) ||
(hba->pci_did == PCI_DEVICE_ID_NX2_5708S))
set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type);
else if ((hba->pci_did == PCI_DEVICE_ID_NX2_5709) ||
(hba->pci_did == PCI_DEVICE_ID_NX2_5709S)) {
set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type);
hba->mail_queue_access = BNX2I_MQ_BIN_MODE;
} else if (hba->pci_did == PCI_DEVICE_ID_NX2_57710 ||
hba->pci_did == PCI_DEVICE_ID_NX2_57711)
set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type);
}
/**
* get_adapter_list_head - returns head of adapter list
*/
struct bnx2i_hba *get_adapter_list_head(void)
{
struct bnx2i_hba *hba = NULL;
struct bnx2i_hba *tmp_hba;
if (!adapter_count)
goto hba_not_found;
mutex_lock(&bnx2i_dev_lock);
list_for_each_entry(tmp_hba, &adapter_list, link) {
if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) {
hba = tmp_hba;
break;
}
}
mutex_unlock(&bnx2i_dev_lock);
hba_not_found:
return hba;
}
/**
* bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance
* @cnic: pointer to cnic device instance
*
*/
struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic)
{
struct bnx2i_hba *hba, *temp;
mutex_lock(&bnx2i_dev_lock);
list_for_each_entry_safe(hba, temp, &adapter_list, link) {
if (hba->cnic == cnic) {
mutex_unlock(&bnx2i_dev_lock);
return hba;
}
}
mutex_unlock(&bnx2i_dev_lock);
return NULL;
}
/**
* bnx2i_start - cnic callback to initialize & start adapter instance
* @handle: transparent handle pointing to adapter structure
*
* This function maps adapter structure to pcidev structure and initiates
* firmware handshake to enable/initialize on chip iscsi components
* This bnx2i - cnic interface api callback is issued after following
* 2 conditions are met -
* a) underlying network interface is up (marked by event 'NETDEV_UP'
* from netdev
* b) bnx2i adapter instance is registered
*/
void bnx2i_start(void *handle)
{
#define BNX2I_INIT_POLL_TIME (1000 / HZ)
struct bnx2i_hba *hba = handle;
int i = HZ;
bnx2i_send_fw_iscsi_init_msg(hba);
while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--)
msleep(BNX2I_INIT_POLL_TIME);
}
/**
* bnx2i_stop - cnic callback to shutdown adapter instance
* @handle: transparent handle pointing to adapter structure
*
* driver checks if adapter is already in shutdown mode, if not start
* the shutdown process
*/
void bnx2i_stop(void *handle)
{
struct bnx2i_hba *hba = handle;
/* check if cleanup happened in GOING_DOWN context */
clear_bit(ADAPTER_STATE_UP, &hba->adapter_state);
if (!test_and_clear_bit(ADAPTER_STATE_GOING_DOWN,
&hba->adapter_state))
iscsi_host_for_each_session(hba->shost,
bnx2i_drop_session);
}
/**
* bnx2i_register_device - register bnx2i adapter instance with the cnic driver
* @hba: Adapter instance to register
*
* registers bnx2i adapter instance with the cnic driver while holding the
* adapter structure lock
*/
void bnx2i_register_device(struct bnx2i_hba *hba)
{
int rc;
if (test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
return;
}
rc = hba->cnic->register_device(hba->cnic, CNIC_ULP_ISCSI, hba);
if (!rc)
set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
}
/**
* bnx2i_reg_dev_all - registers all adapter instances with the cnic driver
*
* registers all bnx2i adapter instances with the cnic driver while holding
* the global resource lock
*/
void bnx2i_reg_dev_all(void)
{
struct bnx2i_hba *hba, *temp;
mutex_lock(&bnx2i_dev_lock);
list_for_each_entry_safe(hba, temp, &adapter_list, link)
bnx2i_register_device(hba);
mutex_unlock(&bnx2i_dev_lock);
}
/**
* bnx2i_unreg_one_device - unregister adapter instance with the cnic driver
* @hba: Adapter instance to unregister
*
* registers bnx2i adapter instance with the cnic driver while holding
* the adapter structure lock
*/
static void bnx2i_unreg_one_device(struct bnx2i_hba *hba)
{
if (hba->ofld_conns_active ||
!test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) ||
test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state))
return;
hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
/* ep_disconnect could come before NETDEV_DOWN, driver won't
* see NETDEV_DOWN as it already unregistered itself.
*/
hba->adapter_state = 0;
clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
}
/**
* bnx2i_unreg_dev_all - unregisters all bnx2i instances with the cnic driver
*
* unregisters all bnx2i adapter instances with the cnic driver while holding
* the global resource lock
*/
void bnx2i_unreg_dev_all(void)
{
struct bnx2i_hba *hba, *temp;
mutex_lock(&bnx2i_dev_lock);
list_for_each_entry_safe(hba, temp, &adapter_list, link)
bnx2i_unreg_one_device(hba);
mutex_unlock(&bnx2i_dev_lock);
}
/**
* bnx2i_init_one - initialize an adapter instance and allocate memory resources
* @hba: bnx2i adapter instance
* @cnic: cnic device handle
*
* Global resource lock is held during critical sections below. This routine is
* called from either cnic_register_driver() or device hot plug context and
* and does majority of device specific initialization
*/
static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic)
{
int rc;
mutex_lock(&bnx2i_dev_lock);
rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba);
if (!rc) {
hba->age++;
set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
list_add_tail(&hba->link, &adapter_list);
adapter_count++;
} else if (rc == -EBUSY) /* duplicate registration */
printk(KERN_ALERT "bnx2i, duplicate registration"
"hba=%p, cnic=%p\n", hba, cnic);
else if (rc == -EAGAIN)
printk(KERN_ERR "bnx2i, driver not registered\n");
else if (rc == -EINVAL)
printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI);
else
printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc);
mutex_unlock(&bnx2i_dev_lock);
return rc;
}
/**
* bnx2i_ulp_init - initialize an adapter instance
* @dev: cnic device handle
*
* Called from cnic_register_driver() context to initialize all enumerated
* cnic devices. This routine allocate adapter structure and other
* device specific resources.
*/
void bnx2i_ulp_init(struct cnic_dev *dev)
{
struct bnx2i_hba *hba;
/* Allocate a HBA structure for this device */
hba = bnx2i_alloc_hba(dev);
if (!hba) {
printk(KERN_ERR "bnx2i init: hba initialization failed\n");
return;
}
/* Get PCI related information and update hba struct members */
clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
if (bnx2i_init_one(hba, dev)) {
printk(KERN_ERR "bnx2i - hba %p init failed\n", hba);
bnx2i_free_hba(hba);
} else
hba->cnic = dev;
}
/**
* bnx2i_ulp_exit - shuts down adapter instance and frees all resources
* @dev: cnic device handle
*
*/
void bnx2i_ulp_exit(struct cnic_dev *dev)
{
struct bnx2i_hba *hba;
hba = bnx2i_find_hba_for_cnic(dev);
if (!hba) {
printk(KERN_INFO "bnx2i_ulp_exit: hba not "
"found, dev 0x%p\n", dev);
return;
}
mutex_lock(&bnx2i_dev_lock);
list_del_init(&hba->link);
adapter_count--;
if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
}
mutex_unlock(&bnx2i_dev_lock);
bnx2i_free_hba(hba);
}
/**
* bnx2i_mod_init - module init entry point
*
* initialize any driver wide global data structures such as endpoint pool,
* tcp port manager/queue, sysfs. finally driver will register itself
* with the cnic module
*/
static int __init bnx2i_mod_init(void)
{
int err;
printk(KERN_INFO "%s", version);
if (!is_power_of_2(sq_size))
sq_size = roundup_pow_of_two(sq_size);
mutex_init(&bnx2i_dev_lock);
bnx2i_scsi_xport_template =
iscsi_register_transport(&bnx2i_iscsi_transport);
if (!bnx2i_scsi_xport_template) {
printk(KERN_ERR "Could not register bnx2i transport.\n");
err = -ENOMEM;
goto out;
}
err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb);
if (err) {
printk(KERN_ERR "Could not register bnx2i cnic driver.\n");
goto unreg_xport;
}
return 0;
unreg_xport:
iscsi_unregister_transport(&bnx2i_iscsi_transport);
out:
return err;
}
/**
* bnx2i_mod_exit - module cleanup/exit entry point
*
* Global resource lock and host adapter lock is held during critical sections
* in this function. Driver will browse through the adapter list, cleans-up
* each instance, unregisters iscsi transport name and finally driver will
* unregister itself with the cnic module
*/
static void __exit bnx2i_mod_exit(void)
{
struct bnx2i_hba *hba;
mutex_lock(&bnx2i_dev_lock);
while (!list_empty(&adapter_list)) {
hba = list_entry(adapter_list.next, struct bnx2i_hba, link);
list_del(&hba->link);
adapter_count--;
if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
}
bnx2i_free_hba(hba);
}
mutex_unlock(&bnx2i_dev_lock);
iscsi_unregister_transport(&bnx2i_iscsi_transport);
cnic_unregister_driver(CNIC_ULP_ISCSI);
}
module_init(bnx2i_mod_init);
module_exit(bnx2i_mod_exit);