/* bnx2i.c: Broadcom 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 * * 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 "2.7.6.2" #define DRV_MODULE_RELDATE "Jun 06, 2013" static char version[] = "Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \ " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; MODULE_AUTHOR("Anil Veerabhadrappa and " "Eddie Wai "); 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);