/* bnx2i.c: Broadcom NetXtreme II iSCSI driver.
*
* Copyright (c) 2006 - 2012 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)
* Maintained by: Eddie Wai (eddie.wai@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 "2.7.2.2"
#define DRV_MODULE_RELDATE "Apr 25, 2012"
static char version[] =
"Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \
" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com> and "
"Eddie Wai <eddie.wai@broadcom.com>");
MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709/57710/57711/57712"
"/57800/57810/57840 iSCSI Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
static DEFINE_MUTEX(bnx2i_dev_lock);
unsigned int event_coal_min = 24;
module_param(event_coal_min, int, 0664);
MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands");
unsigned int event_coal_div = 2;
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, uint, 0664);
MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1");
unsigned int error_mask2 = 0x00;
module_param(error_mask2, uint, 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;
DEFINE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu);
static int bnx2i_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu);
/* notification function for CPU hotplug events */
static struct notifier_block bnx2i_cpu_notifier = {
.notifier_call = bnx2i_cpu_callback,
};
/**
* bnx2i_identify_device - identifies NetXtreme II device type
* @hba: Adapter structure pointer
* @cnic: Corresponding cnic device
*
* 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, struct cnic_dev *dev)
{
hba->cnic_dev_type = 0;
if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
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 (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {
set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type);
} else {
printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n",
hba->pci_did);
}
}
/**
* 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;
/*
* We should never register devices that don't support iSCSI
* (see bnx2i_init_one), so something is wrong if we try to
* start a iSCSI adapter on hardware with 0 supported iSCSI
* connections
*/
BUG_ON(!hba->cnic->max_iscsi_conn);
bnx2i_send_fw_iscsi_init_msg(hba);
while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--)
msleep(BNX2I_INIT_POLL_TIME);
}
/**
* bnx2i_chip_cleanup - local routine to handle chip cleanup
* @hba: Adapter instance to register
*
* Driver checks if adapter still has any active connections before
* executing the cleanup process
*/
static void bnx2i_chip_cleanup(struct bnx2i_hba *hba)
{
struct bnx2i_endpoint *bnx2i_ep;
struct list_head *pos, *tmp;
if (hba->ofld_conns_active) {
/* Stage to force the disconnection
* This is the case where the daemon is either slow or
* not present
*/
printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active "
"connections\n", hba->netdev->name,
hba->ofld_conns_active);
mutex_lock(&hba->net_dev_lock);
list_for_each_safe(pos, tmp, &hba->ep_active_list) {
bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link);
/* Clean up the chip only */
bnx2i_hw_ep_disconnect(bnx2i_ep);
bnx2i_ep->cm_sk = NULL;
}
mutex_unlock(&hba->net_dev_lock);
}
}
/**
* 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;
int conns_active;
int wait_delay = 1 * HZ;
/* check if cleanup happened in GOING_DOWN context */
if (!test_and_set_bit(ADAPTER_STATE_GOING_DOWN,
&hba->adapter_state)) {
iscsi_host_for_each_session(hba->shost,
bnx2i_drop_session);
wait_delay = hba->hba_shutdown_tmo;
}
/* Wait for inflight offload connection tasks to complete before
* proceeding. Forcefully terminate all connection recovery in
* progress at the earliest, either in bind(), send_pdu(LOGIN),
* or conn_start()
*/
wait_event_interruptible_timeout(hba->eh_wait,
(list_empty(&hba->ep_ofld_list) &&
list_empty(&hba->ep_destroy_list)),
2 * HZ);
/* Wait for all endpoints to be torn down, Chip will be reset once
* control returns to network driver. So it is required to cleanup and
* release all connection resources before returning from this routine.
*/
while (hba->ofld_conns_active) {
conns_active = hba->ofld_conns_active;
wait_event_interruptible_timeout(hba->eh_wait,
(hba->ofld_conns_active != conns_active),
wait_delay);
if (hba->ofld_conns_active == conns_active)
break;
}
bnx2i_chip_cleanup(hba);
/* This flag should be cleared last so that ep_disconnect() gracefully
* cleans up connection context
*/
clear_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state);
clear_bit(ADAPTER_STATE_UP, &hba->adapter_state);
}
/**
* 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);
if (!cnic->max_iscsi_conn) {
printk(KERN_ALERT "bnx2i: dev %s does not support "
"iSCSI\n", hba->netdev->name);
rc = -EOPNOTSUPP;
goto out;
}
hba->cnic = cnic;
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);
out:
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);
}
}
/**
* 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_get_stats - Retrieve various statistic from iSCSI offload
* @handle: bnx2i_hba
*
* function callback exported via bnx2i - cnic driver interface to
* retrieve various iSCSI offload related statistics.
*/
int bnx2i_get_stats(void *handle)
{
struct bnx2i_hba *hba = handle;
struct iscsi_stats_info *stats;
if (!hba)
return -EINVAL;
stats = (struct iscsi_stats_info *)hba->cnic->stats_addr;
if (!stats)
return -ENOMEM;
strlcpy(stats->version, DRV_MODULE_VERSION, sizeof(stats->version));
memcpy(stats->mac_add1 + 2, hba->cnic->mac_addr, ETH_ALEN);
stats->max_frame_size = hba->netdev->mtu;
stats->txq_size = hba->max_sqes;
stats->rxq_size = hba->max_cqes;
stats->txq_avg_depth = 0;
stats->rxq_avg_depth = 0;
GET_STATS_64(hba, stats, rx_pdus);
GET_STATS_64(hba, stats, rx_bytes);
GET_STATS_64(hba, stats, tx_pdus);
GET_STATS_64(hba, stats, tx_bytes);
return 0;
}
/**
* bnx2i_percpu_thread_create - Create a receive thread for an
* online CPU
*
* @cpu: cpu index for the online cpu
*/
static void bnx2i_percpu_thread_create(unsigned int cpu)
{
struct bnx2i_percpu_s *p;
struct task_struct *thread;
p = &per_cpu(bnx2i_percpu, cpu);
thread = kthread_create_on_node(bnx2i_percpu_io_thread, (void *)p,
cpu_to_node(cpu),
"bnx2i_thread/%d", cpu);
/* bind thread to the cpu */
if (likely(!IS_ERR(thread))) {
kthread_bind(thread, cpu);
p->iothread = thread;
wake_up_process(thread);
}
}
static void bnx2i_percpu_thread_destroy(unsigned int cpu)
{
struct bnx2i_percpu_s *p;
struct task_struct *thread;
struct bnx2i_work *work, *tmp;
/* Prevent any new work from being queued for this CPU */
p = &per_cpu(bnx2i_percpu, cpu);
spin_lock_bh(&p->p_work_lock);
thread = p->iothread;
p->iothread = NULL;
/* Free all work in the list */
list_for_each_entry_safe(work, tmp, &p->work_list, list) {
list_del_init(&work->list);
bnx2i_process_scsi_cmd_resp(work->session,
work->bnx2i_conn, &work->cqe);
kfree(work);
}
spin_unlock_bh(&p->p_work_lock);
if (thread)
kthread_stop(thread);
}
/**
* bnx2i_cpu_callback - Handler for CPU hotplug events
*
* @nfb: The callback data block
* @action: The event triggering the callback
* @hcpu: The index of the CPU that the event is for
*
* This creates or destroys per-CPU data for iSCSI
*
* Returns NOTIFY_OK always.
*/
static int bnx2i_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned cpu = (unsigned long)hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
printk(KERN_INFO "bnx2i: CPU %x online: Create Rx thread\n",
cpu);
bnx2i_percpu_thread_create(cpu);
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
printk(KERN_INFO "CPU %x offline: Remove Rx thread\n", cpu);
bnx2i_percpu_thread_destroy(cpu);
break;
default:
break;
}
return NOTIFY_OK;
}
/**
* 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;
unsigned cpu = 0;
struct bnx2i_percpu_s *p;
printk(KERN_INFO "%s", version);
if (sq_size && !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;
}
/* Create percpu kernel threads to handle iSCSI I/O completions */
for_each_possible_cpu(cpu) {
p = &per_cpu(bnx2i_percpu, cpu);
INIT_LIST_HEAD(&p->work_list);
spin_lock_init(&p->p_work_lock);
p->iothread = NULL;
}
for_each_online_cpu(cpu)
bnx2i_percpu_thread_create(cpu);
/* Initialize per CPU interrupt thread */
register_hotcpu_notifier(&bnx2i_cpu_notifier);
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;
unsigned cpu = 0;
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)) {
bnx2i_chip_cleanup(hba);
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);
unregister_hotcpu_notifier(&bnx2i_cpu_notifier);
for_each_online_cpu(cpu)
bnx2i_percpu_thread_destroy(cpu);
iscsi_unregister_transport(&bnx2i_iscsi_transport);
cnic_unregister_driver(CNIC_ULP_ISCSI);
}
module_init(bnx2i_mod_init);
module_exit(bnx2i_mod_exit);