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1/* bnx2i.c: QLogic NetXtreme II iSCSI driver.2 *3 * Copyright (c) 2006 - 2013 Broadcom Corporation4 * Copyright (c) 2007, 2008 Red Hat, Inc. All rights reserved.5 * Copyright (c) 2007, 2008 Mike Christie6 * Copyright (c) 2014, QLogic Corporation7 *8 * This program is free software; you can redistribute it and/or modify9 * it under the terms of the GNU General Public License as published by10 * the Free Software Foundation.11 *12 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)13 * Previously Maintained by: Eddie Wai (eddie.wai@broadcom.com)14 * Maintained by: QLogic-Storage-Upstream@qlogic.com15 */16 17#include "bnx2i.h"18 19static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list);20static u32 adapter_count;21 22#define DRV_MODULE_NAME "bnx2i"23#define DRV_MODULE_VERSION "2.7.10.1"24#define DRV_MODULE_RELDATE "Jul 16, 2014"25 26static char version[] =27 "QLogic NetXtreme II iSCSI Driver " DRV_MODULE_NAME \28 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";29 30 31MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com> and "32 "Eddie Wai <eddie.wai@broadcom.com>");33 34MODULE_DESCRIPTION("QLogic NetXtreme II BCM5706/5708/5709/57710/57711/57712"35 "/57800/57810/57840 iSCSI Driver");36MODULE_LICENSE("GPL");37MODULE_VERSION(DRV_MODULE_VERSION);38 39static DEFINE_MUTEX(bnx2i_dev_lock);40 41unsigned int event_coal_min = 24;42module_param(event_coal_min, int, 0664);43MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands");44 45unsigned int event_coal_div = 2;46module_param(event_coal_div, int, 0664);47MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor");48 49unsigned int en_tcp_dack = 1;50module_param(en_tcp_dack, int, 0664);51MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK");52 53unsigned int error_mask1 = 0x00;54module_param(error_mask1, uint, 0664);55MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1");56 57unsigned int error_mask2 = 0x00;58module_param(error_mask2, uint, 0664);59MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2");60 61unsigned int sq_size;62module_param(sq_size, int, 0664);63MODULE_PARM_DESC(sq_size, "Configure SQ size");64 65unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT;66module_param(rq_size, int, 0664);67MODULE_PARM_DESC(rq_size, "Configure RQ size");68 69u64 iscsi_error_mask = 0x00;70 71DEFINE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu);72 73/**74 * bnx2i_identify_device - identifies NetXtreme II device type75 * @hba: Adapter structure pointer76 * @dev: Corresponding cnic device77 *78 * This function identifies the NX2 device type and sets appropriate79 * queue mailbox register access method, 5709 requires driver to80 * access MBOX regs using *bin* mode81 */82void bnx2i_identify_device(struct bnx2i_hba *hba, struct cnic_dev *dev)83{84 hba->cnic_dev_type = 0;85 if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {86 if (hba->pci_did == PCI_DEVICE_ID_NX2_5706 ||87 hba->pci_did == PCI_DEVICE_ID_NX2_5706S) {88 set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type);89 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_5708 ||90 hba->pci_did == PCI_DEVICE_ID_NX2_5708S) {91 set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type);92 } else if (hba->pci_did == PCI_DEVICE_ID_NX2_5709 ||93 hba->pci_did == PCI_DEVICE_ID_NX2_5709S) {94 set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type);95 hba->mail_queue_access = BNX2I_MQ_BIN_MODE;96 }97 } else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {98 set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type);99 } else {100 printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n",101 hba->pci_did);102 }103}104 105 106/**107 * get_adapter_list_head - returns head of adapter list108 */109struct bnx2i_hba *get_adapter_list_head(void)110{111 struct bnx2i_hba *hba = NULL;112 struct bnx2i_hba *tmp_hba;113 114 if (!adapter_count)115 goto hba_not_found;116 117 mutex_lock(&bnx2i_dev_lock);118 list_for_each_entry(tmp_hba, &adapter_list, link) {119 if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) {120 hba = tmp_hba;121 break;122 }123 }124 mutex_unlock(&bnx2i_dev_lock);125hba_not_found:126 return hba;127}128 129 130/**131 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance132 * @cnic: pointer to cnic device instance133 *134 */135struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic)136{137 struct bnx2i_hba *hba, *temp;138 139 mutex_lock(&bnx2i_dev_lock);140 list_for_each_entry_safe(hba, temp, &adapter_list, link) {141 if (hba->cnic == cnic) {142 mutex_unlock(&bnx2i_dev_lock);143 return hba;144 }145 }146 mutex_unlock(&bnx2i_dev_lock);147 return NULL;148}149 150 151/**152 * bnx2i_start - cnic callback to initialize & start adapter instance153 * @handle: transparent handle pointing to adapter structure154 *155 * This function maps adapter structure to pcidev structure and initiates156 * firmware handshake to enable/initialize on chip iscsi components157 * This bnx2i - cnic interface api callback is issued after following158 * 2 conditions are met -159 * a) underlying network interface is up (marked by event 'NETDEV_UP'160 * from netdev161 * b) bnx2i adapter instance is registered162 */163void bnx2i_start(void *handle)164{165#define BNX2I_INIT_POLL_TIME (1000 / HZ)166 struct bnx2i_hba *hba = handle;167 int i = HZ;168 169 /* On some bnx2x devices, it is possible that iSCSI is no170 * longer supported after firmware is downloaded. In that171 * case, the iscsi_init_msg will return failure.172 */173 174 bnx2i_send_fw_iscsi_init_msg(hba);175 while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) &&176 !test_bit(ADAPTER_STATE_INIT_FAILED, &hba->adapter_state) && i--)177 msleep(BNX2I_INIT_POLL_TIME);178}179 180 181/**182 * bnx2i_chip_cleanup - local routine to handle chip cleanup183 * @hba: Adapter instance to register184 *185 * Driver checks if adapter still has any active connections before186 * executing the cleanup process187 */188static void bnx2i_chip_cleanup(struct bnx2i_hba *hba)189{190 struct bnx2i_endpoint *bnx2i_ep;191 struct list_head *pos, *tmp;192 193 if (hba->ofld_conns_active) {194 /* Stage to force the disconnection195 * This is the case where the daemon is either slow or196 * not present197 */198 printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active "199 "connections\n", hba->netdev->name,200 hba->ofld_conns_active);201 mutex_lock(&hba->net_dev_lock);202 list_for_each_safe(pos, tmp, &hba->ep_active_list) {203 bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link);204 /* Clean up the chip only */205 bnx2i_hw_ep_disconnect(bnx2i_ep);206 bnx2i_ep->cm_sk = NULL;207 }208 mutex_unlock(&hba->net_dev_lock);209 }210}211 212 213/**214 * bnx2i_stop - cnic callback to shutdown adapter instance215 * @handle: transparent handle pointing to adapter structure216 *217 * driver checks if adapter is already in shutdown mode, if not start218 * the shutdown process219 */220void bnx2i_stop(void *handle)221{222 struct bnx2i_hba *hba = handle;223 int conns_active;224 int wait_delay = 1 * HZ;225 226 /* check if cleanup happened in GOING_DOWN context */227 if (!test_and_set_bit(ADAPTER_STATE_GOING_DOWN,228 &hba->adapter_state)) {229 iscsi_host_for_each_session(hba->shost,230 bnx2i_drop_session);231 wait_delay = hba->hba_shutdown_tmo;232 }233 /* Wait for inflight offload connection tasks to complete before234 * proceeding. Forcefully terminate all connection recovery in235 * progress at the earliest, either in bind(), send_pdu(LOGIN),236 * or conn_start()237 */238 wait_event_interruptible_timeout(hba->eh_wait,239 (list_empty(&hba->ep_ofld_list) &&240 list_empty(&hba->ep_destroy_list)),241 2 * HZ);242 /* Wait for all endpoints to be torn down, Chip will be reset once243 * control returns to network driver. So it is required to cleanup and244 * release all connection resources before returning from this routine.245 */246 while (hba->ofld_conns_active) {247 conns_active = hba->ofld_conns_active;248 wait_event_interruptible_timeout(hba->eh_wait,249 (hba->ofld_conns_active != conns_active),250 wait_delay);251 if (hba->ofld_conns_active == conns_active)252 break;253 }254 bnx2i_chip_cleanup(hba);255 256 /* This flag should be cleared last so that ep_disconnect() gracefully257 * cleans up connection context258 */259 clear_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state);260 clear_bit(ADAPTER_STATE_UP, &hba->adapter_state);261}262 263 264/**265 * bnx2i_init_one - initialize an adapter instance and allocate memory resources266 * @hba: bnx2i adapter instance267 * @cnic: cnic device handle268 *269 * Global resource lock is held during critical sections below. This routine is270 * called from either cnic_register_driver() or device hot plug context and271 * and does majority of device specific initialization272 */273static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic)274{275 int rc;276 277 mutex_lock(&bnx2i_dev_lock);278 if (!cnic->max_iscsi_conn) {279 printk(KERN_ALERT "bnx2i: dev %s does not support "280 "iSCSI\n", hba->netdev->name);281 rc = -EOPNOTSUPP;282 goto out;283 }284 285 hba->cnic = cnic;286 rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba);287 if (!rc) {288 hba->age++;289 set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);290 list_add_tail(&hba->link, &adapter_list);291 adapter_count++;292 } else if (rc == -EBUSY) /* duplicate registration */293 printk(KERN_ALERT "bnx2i, duplicate registration"294 "hba=%p, cnic=%p\n", hba, cnic);295 else if (rc == -EAGAIN)296 printk(KERN_ERR "bnx2i, driver not registered\n");297 else if (rc == -EINVAL)298 printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI);299 else300 printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc);301 302out:303 mutex_unlock(&bnx2i_dev_lock);304 305 return rc;306}307 308 309/**310 * bnx2i_ulp_init - initialize an adapter instance311 * @dev: cnic device handle312 *313 * Called from cnic_register_driver() context to initialize all enumerated314 * cnic devices. This routine allocate adapter structure and other315 * device specific resources.316 */317void bnx2i_ulp_init(struct cnic_dev *dev)318{319 struct bnx2i_hba *hba;320 321 /* Allocate a HBA structure for this device */322 hba = bnx2i_alloc_hba(dev);323 if (!hba) {324 printk(KERN_ERR "bnx2i init: hba initialization failed\n");325 return;326 }327 328 /* Get PCI related information and update hba struct members */329 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);330 if (bnx2i_init_one(hba, dev)) {331 printk(KERN_ERR "bnx2i - hba %p init failed\n", hba);332 bnx2i_free_hba(hba);333 }334}335 336 337/**338 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources339 * @dev: cnic device handle340 *341 */342void bnx2i_ulp_exit(struct cnic_dev *dev)343{344 struct bnx2i_hba *hba;345 346 hba = bnx2i_find_hba_for_cnic(dev);347 if (!hba) {348 printk(KERN_INFO "bnx2i_ulp_exit: hba not "349 "found, dev 0x%p\n", dev);350 return;351 }352 mutex_lock(&bnx2i_dev_lock);353 list_del_init(&hba->link);354 adapter_count--;355 356 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {357 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);358 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);359 }360 mutex_unlock(&bnx2i_dev_lock);361 362 bnx2i_free_hba(hba);363}364 365 366/**367 * bnx2i_get_stats - Retrieve various statistic from iSCSI offload368 * @handle: bnx2i_hba369 *370 * function callback exported via bnx2i - cnic driver interface to371 * retrieve various iSCSI offload related statistics.372 */373int bnx2i_get_stats(void *handle)374{375 struct bnx2i_hba *hba = handle;376 struct iscsi_stats_info *stats;377 378 if (!hba)379 return -EINVAL;380 381 stats = (struct iscsi_stats_info *)hba->cnic->stats_addr;382 383 if (!stats)384 return -ENOMEM;385 386 strscpy(stats->version, DRV_MODULE_VERSION, sizeof(stats->version));387 memcpy(stats->mac_add1 + 2, hba->cnic->mac_addr, ETH_ALEN);388 389 stats->max_frame_size = hba->netdev->mtu;390 stats->txq_size = hba->max_sqes;391 stats->rxq_size = hba->max_cqes;392 393 stats->txq_avg_depth = 0;394 stats->rxq_avg_depth = 0;395 396 GET_STATS_64(hba, stats, rx_pdus);397 GET_STATS_64(hba, stats, rx_bytes);398 399 GET_STATS_64(hba, stats, tx_pdus);400 GET_STATS_64(hba, stats, tx_bytes);401 402 return 0;403}404 405 406/**407 * bnx2i_cpu_online - Create a receive thread for an online CPU408 *409 * @cpu: cpu index for the online cpu410 */411static int bnx2i_cpu_online(unsigned int cpu)412{413 struct bnx2i_percpu_s *p;414 struct task_struct *thread;415 416 p = &per_cpu(bnx2i_percpu, cpu);417 418 thread = kthread_create_on_node(bnx2i_percpu_io_thread, (void *)p,419 cpu_to_node(cpu),420 "bnx2i_thread/%d", cpu);421 if (IS_ERR(thread))422 return PTR_ERR(thread);423 424 /* bind thread to the cpu */425 kthread_bind(thread, cpu);426 p->iothread = thread;427 wake_up_process(thread);428 return 0;429}430 431static int bnx2i_cpu_offline(unsigned int cpu)432{433 struct bnx2i_percpu_s *p;434 struct task_struct *thread;435 struct bnx2i_work *work, *tmp;436 437 /* Prevent any new work from being queued for this CPU */438 p = &per_cpu(bnx2i_percpu, cpu);439 spin_lock_bh(&p->p_work_lock);440 thread = p->iothread;441 p->iothread = NULL;442 443 /* Free all work in the list */444 list_for_each_entry_safe(work, tmp, &p->work_list, list) {445 list_del_init(&work->list);446 bnx2i_process_scsi_cmd_resp(work->session,447 work->bnx2i_conn, &work->cqe);448 kfree(work);449 }450 451 spin_unlock_bh(&p->p_work_lock);452 if (thread)453 kthread_stop(thread);454 return 0;455}456 457static enum cpuhp_state bnx2i_online_state;458 459/**460 * bnx2i_mod_init - module init entry point461 *462 * initialize any driver wide global data structures such as endpoint pool,463 * tcp port manager/queue, sysfs. finally driver will register itself464 * with the cnic module465 */466static int __init bnx2i_mod_init(void)467{468 int err;469 unsigned cpu = 0;470 struct bnx2i_percpu_s *p;471 472 printk(KERN_INFO "%s", version);473 474 if (sq_size && !is_power_of_2(sq_size))475 sq_size = roundup_pow_of_two(sq_size);476 477 bnx2i_scsi_xport_template =478 iscsi_register_transport(&bnx2i_iscsi_transport);479 if (!bnx2i_scsi_xport_template) {480 printk(KERN_ERR "Could not register bnx2i transport.\n");481 err = -ENOMEM;482 goto out;483 }484 485 err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb);486 if (err) {487 printk(KERN_ERR "Could not register bnx2i cnic driver.\n");488 goto unreg_xport;489 }490 491 /* Create percpu kernel threads to handle iSCSI I/O completions */492 for_each_possible_cpu(cpu) {493 p = &per_cpu(bnx2i_percpu, cpu);494 INIT_LIST_HEAD(&p->work_list);495 spin_lock_init(&p->p_work_lock);496 p->iothread = NULL;497 }498 499 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "scsi/bnx2i:online",500 bnx2i_cpu_online, bnx2i_cpu_offline);501 if (err < 0)502 goto unreg_driver;503 bnx2i_online_state = err;504 return 0;505 506unreg_driver:507 cnic_unregister_driver(CNIC_ULP_ISCSI);508unreg_xport:509 iscsi_unregister_transport(&bnx2i_iscsi_transport);510out:511 return err;512}513 514 515/**516 * bnx2i_mod_exit - module cleanup/exit entry point517 *518 * Global resource lock and host adapter lock is held during critical sections519 * in this function. Driver will browse through the adapter list, cleans-up520 * each instance, unregisters iscsi transport name and finally driver will521 * unregister itself with the cnic module522 */523static void __exit bnx2i_mod_exit(void)524{525 struct bnx2i_hba *hba;526 527 mutex_lock(&bnx2i_dev_lock);528 while (!list_empty(&adapter_list)) {529 hba = list_entry(adapter_list.next, struct bnx2i_hba, link);530 list_del(&hba->link);531 adapter_count--;532 533 if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {534 bnx2i_chip_cleanup(hba);535 hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);536 clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);537 }538 539 bnx2i_free_hba(hba);540 }541 mutex_unlock(&bnx2i_dev_lock);542 543 cpuhp_remove_state(bnx2i_online_state);544 545 iscsi_unregister_transport(&bnx2i_iscsi_transport);546 cnic_unregister_driver(CNIC_ULP_ISCSI);547}548 549module_init(bnx2i_mod_init);550module_exit(bnx2i_mod_exit);551