linux/drivers/scsi/bnx2i/bnx2i_init.c
Thomas Gleixner f9f22a8691 scsi: bnx2i: Simplify cpu hotplug code
The CPU hotplug related code of this driver can be simplified by:

1) Consolidating the callbacks into a single state. The CPU thread can be
   torn down on the CPU which goes offline. There is no point in delaying
   that to the CPU dead state

2) Let the core code invoke the online/offline callbacks and remove the
   extra for_each_online_cpu() loops.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-07-26 21:51:25 -04:00

553 lines
15 KiB
C

/* bnx2i.c: QLogic NetXtreme II iSCSI driver.
*
* Copyright (c) 2006 - 2013 Broadcom Corporation
* Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved.
* Copyright (c) 2007, 2008 Mike Christie
* Copyright (c) 2014, QLogic Corporation
*
* 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)
* Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com)
* Maintained by: QLogic-Storage-Upstream@qlogic.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 "2.7.10.1"
#define DRV_MODULE_RELDATE "Jul 16, 2014"
static char version[] =
"QLogic 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("QLogic 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);
/**
* 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;
/* On some bnx2x devices, it is possible that iSCSI is no
* longer supported after firmware is downloaded. In that
* case, the iscsi_init_msg will return failure.
*/
bnx2i_send_fw_iscsi_init_msg(hba);
while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) &&
!test_bit(ADAPTER_STATE_INIT_FAILED, &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_cpu_online - Create a receive thread for an online CPU
*
* @cpu: cpu index for the online cpu
*/
static int bnx2i_cpu_online(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);
if (IS_ERR(thread))
return PTR_ERR(thread);
/* bind thread to the cpu */
kthread_bind(thread, cpu);
p->iothread = thread;
wake_up_process(thread);
return 0;
}
static int bnx2i_cpu_offline(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);
return 0;
}
static enum cpuhp_state bnx2i_online_state;
/**
* 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;
}
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "scsi/bnx2i:online",
bnx2i_cpu_online, bnx2i_cpu_offline);
if (err < 0)
goto unreg_driver;
bnx2i_online_state = err;
return 0;
unreg_driver:
cnic_unregister_driver(CNIC_ULP_ISCSI);
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)) {
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);
cpuhp_remove_state(bnx2i_online_state);
iscsi_unregister_transport(&bnx2i_iscsi_transport);
cnic_unregister_driver(CNIC_ULP_ISCSI);
}
module_init(bnx2i_mod_init);
module_exit(bnx2i_mod_exit);