diff options
Diffstat (limited to 'drivers/target/sbp/sbp_target.c')
| -rw-r--r-- | drivers/target/sbp/sbp_target.c | 2350 |
1 files changed, 2350 insertions, 0 deletions
diff --git a/drivers/target/sbp/sbp_target.c b/drivers/target/sbp/sbp_target.c new file mode 100644 index 000000000..e4a9b9fe3 --- /dev/null +++ b/drivers/target/sbp/sbp_target.c @@ -0,0 +1,2350 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SBP2 target driver (SCSI over IEEE1394 in target mode) + * + * Copyright (C) 2011 Chris Boot <bootc@bootc.net> + */ + +#define KMSG_COMPONENT "sbp_target" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/configfs.h> +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/firewire.h> +#include <linux/firewire-constants.h> +#include <scsi/scsi_proto.h> +#include <scsi/scsi_tcq.h> +#include <target/target_core_base.h> +#include <target/target_core_backend.h> +#include <target/target_core_fabric.h> +#include <asm/unaligned.h> + +#include "sbp_target.h" + +/* FireWire address region for management and command block address handlers */ +static const struct fw_address_region sbp_register_region = { + .start = CSR_REGISTER_BASE + 0x10000, + .end = 0x1000000000000ULL, +}; + +static const u32 sbp_unit_directory_template[] = { + 0x1200609e, /* unit_specifier_id: NCITS/T10 */ + 0x13010483, /* unit_sw_version: 1155D Rev 4 */ + 0x3800609e, /* command_set_specifier_id: NCITS/T10 */ + 0x390104d8, /* command_set: SPC-2 */ + 0x3b000000, /* command_set_revision: 0 */ + 0x3c000001, /* firmware_revision: 1 */ +}; + +#define SESSION_MAINTENANCE_INTERVAL HZ + +static atomic_t login_id = ATOMIC_INIT(0); + +static void session_maintenance_work(struct work_struct *); +static int sbp_run_transaction(struct fw_card *, int, int, int, int, + unsigned long long, void *, size_t); + +static int read_peer_guid(u64 *guid, const struct sbp_management_request *req) +{ + int ret; + __be32 high, low; + + ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST, + req->node_addr, req->generation, req->speed, + (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 3 * 4, + &high, sizeof(high)); + if (ret != RCODE_COMPLETE) + return ret; + + ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST, + req->node_addr, req->generation, req->speed, + (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 4 * 4, + &low, sizeof(low)); + if (ret != RCODE_COMPLETE) + return ret; + + *guid = (u64)be32_to_cpu(high) << 32 | be32_to_cpu(low); + + return RCODE_COMPLETE; +} + +static struct sbp_session *sbp_session_find_by_guid( + struct sbp_tpg *tpg, u64 guid) +{ + struct se_session *se_sess; + struct sbp_session *sess, *found = NULL; + + spin_lock_bh(&tpg->se_tpg.session_lock); + list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) { + sess = se_sess->fabric_sess_ptr; + if (sess->guid == guid) + found = sess; + } + spin_unlock_bh(&tpg->se_tpg.session_lock); + + return found; +} + +static struct sbp_login_descriptor *sbp_login_find_by_lun( + struct sbp_session *session, u32 unpacked_lun) +{ + struct sbp_login_descriptor *login, *found = NULL; + + spin_lock_bh(&session->lock); + list_for_each_entry(login, &session->login_list, link) { + if (login->login_lun == unpacked_lun) + found = login; + } + spin_unlock_bh(&session->lock); + + return found; +} + +static int sbp_login_count_all_by_lun( + struct sbp_tpg *tpg, + u32 unpacked_lun, + int exclusive) +{ + struct se_session *se_sess; + struct sbp_session *sess; + struct sbp_login_descriptor *login; + int count = 0; + + spin_lock_bh(&tpg->se_tpg.session_lock); + list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) { + sess = se_sess->fabric_sess_ptr; + + spin_lock_bh(&sess->lock); + list_for_each_entry(login, &sess->login_list, link) { + if (login->login_lun != unpacked_lun) + continue; + + if (!exclusive || login->exclusive) + count++; + } + spin_unlock_bh(&sess->lock); + } + spin_unlock_bh(&tpg->se_tpg.session_lock); + + return count; +} + +static struct sbp_login_descriptor *sbp_login_find_by_id( + struct sbp_tpg *tpg, int login_id) +{ + struct se_session *se_sess; + struct sbp_session *sess; + struct sbp_login_descriptor *login, *found = NULL; + + spin_lock_bh(&tpg->se_tpg.session_lock); + list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) { + sess = se_sess->fabric_sess_ptr; + + spin_lock_bh(&sess->lock); + list_for_each_entry(login, &sess->login_list, link) { + if (login->login_id == login_id) + found = login; + } + spin_unlock_bh(&sess->lock); + } + spin_unlock_bh(&tpg->se_tpg.session_lock); + + return found; +} + +static u32 sbp_get_lun_from_tpg(struct sbp_tpg *tpg, u32 login_lun, int *err) +{ + struct se_portal_group *se_tpg = &tpg->se_tpg; + struct se_lun *se_lun; + + rcu_read_lock(); + hlist_for_each_entry_rcu(se_lun, &se_tpg->tpg_lun_hlist, link) { + if (se_lun->unpacked_lun == login_lun) { + rcu_read_unlock(); + *err = 0; + return login_lun; + } + } + rcu_read_unlock(); + + *err = -ENODEV; + return login_lun; +} + +static struct sbp_session *sbp_session_create( + struct sbp_tpg *tpg, + u64 guid) +{ + struct sbp_session *sess; + int ret; + char guid_str[17]; + + snprintf(guid_str, sizeof(guid_str), "%016llx", guid); + + sess = kmalloc(sizeof(*sess), GFP_KERNEL); + if (!sess) + return ERR_PTR(-ENOMEM); + + spin_lock_init(&sess->lock); + INIT_LIST_HEAD(&sess->login_list); + INIT_DELAYED_WORK(&sess->maint_work, session_maintenance_work); + sess->guid = guid; + + sess->se_sess = target_setup_session(&tpg->se_tpg, 128, + sizeof(struct sbp_target_request), + TARGET_PROT_NORMAL, guid_str, + sess, NULL); + if (IS_ERR(sess->se_sess)) { + pr_err("failed to init se_session\n"); + ret = PTR_ERR(sess->se_sess); + kfree(sess); + return ERR_PTR(ret); + } + + return sess; +} + +static void sbp_session_release(struct sbp_session *sess, bool cancel_work) +{ + spin_lock_bh(&sess->lock); + if (!list_empty(&sess->login_list)) { + spin_unlock_bh(&sess->lock); + return; + } + spin_unlock_bh(&sess->lock); + + if (cancel_work) + cancel_delayed_work_sync(&sess->maint_work); + + target_remove_session(sess->se_sess); + + if (sess->card) + fw_card_put(sess->card); + + kfree(sess); +} + +static void sbp_target_agent_unregister(struct sbp_target_agent *); + +static void sbp_login_release(struct sbp_login_descriptor *login, + bool cancel_work) +{ + struct sbp_session *sess = login->sess; + + /* FIXME: abort/wait on tasks */ + + sbp_target_agent_unregister(login->tgt_agt); + + if (sess) { + spin_lock_bh(&sess->lock); + list_del(&login->link); + spin_unlock_bh(&sess->lock); + + sbp_session_release(sess, cancel_work); + } + + kfree(login); +} + +static struct sbp_target_agent *sbp_target_agent_register( + struct sbp_login_descriptor *); + +static void sbp_management_request_login( + struct sbp_management_agent *agent, struct sbp_management_request *req, + int *status_data_size) +{ + struct sbp_tport *tport = agent->tport; + struct sbp_tpg *tpg = tport->tpg; + struct sbp_session *sess; + struct sbp_login_descriptor *login; + struct sbp_login_response_block *response; + u64 guid; + u32 unpacked_lun; + int login_response_len, ret; + + unpacked_lun = sbp_get_lun_from_tpg(tpg, + LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)), &ret); + if (ret) { + pr_notice("login to unknown LUN: %d\n", + LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc))); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LUN_NOTSUPP)); + return; + } + + ret = read_peer_guid(&guid, req); + if (ret != RCODE_COMPLETE) { + pr_warn("failed to read peer GUID: %d\n", ret); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR)); + return; + } + + pr_notice("mgt_agent LOGIN to LUN %d from %016llx\n", + unpacked_lun, guid); + + sess = sbp_session_find_by_guid(tpg, guid); + if (sess) { + login = sbp_login_find_by_lun(sess, unpacked_lun); + if (login) { + pr_notice("initiator already logged-in\n"); + + /* + * SBP-2 R4 says we should return access denied, but + * that can confuse initiators. Instead we need to + * treat this like a reconnect, but send the login + * response block like a fresh login. + * + * This is required particularly in the case of Apple + * devices booting off the FireWire target, where + * the firmware has an active login to the target. When + * the OS takes control of the session it issues its own + * LOGIN rather than a RECONNECT. To avoid the machine + * waiting until the reconnect_hold expires, we can skip + * the ACCESS_DENIED errors to speed things up. + */ + + goto already_logged_in; + } + } + + /* + * check exclusive bit in login request + * reject with access_denied if any logins present + */ + if (LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc)) && + sbp_login_count_all_by_lun(tpg, unpacked_lun, 0)) { + pr_warn("refusing exclusive login with other active logins\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED)); + return; + } + + /* + * check exclusive bit in any existing login descriptor + * reject with access_denied if any exclusive logins present + */ + if (sbp_login_count_all_by_lun(tpg, unpacked_lun, 1)) { + pr_warn("refusing login while another exclusive login present\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED)); + return; + } + + /* + * check we haven't exceeded the number of allowed logins + * reject with resources_unavailable if we have + */ + if (sbp_login_count_all_by_lun(tpg, unpacked_lun, 0) >= + tport->max_logins_per_lun) { + pr_warn("max number of logins reached\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL)); + return; + } + + if (!sess) { + sess = sbp_session_create(tpg, guid); + if (IS_ERR(sess)) { + switch (PTR_ERR(sess)) { + case -EPERM: + ret = SBP_STATUS_ACCESS_DENIED; + break; + default: + ret = SBP_STATUS_RESOURCES_UNAVAIL; + break; + } + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP( + STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(ret)); + return; + } + + sess->node_id = req->node_addr; + sess->card = fw_card_get(req->card); + sess->generation = req->generation; + sess->speed = req->speed; + + schedule_delayed_work(&sess->maint_work, + SESSION_MAINTENANCE_INTERVAL); + } + + /* only take the latest reconnect_hold into account */ + sess->reconnect_hold = min( + 1 << LOGIN_ORB_RECONNECT(be32_to_cpu(req->orb.misc)), + tport->max_reconnect_timeout) - 1; + + login = kmalloc(sizeof(*login), GFP_KERNEL); + if (!login) { + pr_err("failed to allocate login descriptor\n"); + + sbp_session_release(sess, true); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL)); + return; + } + + login->sess = sess; + login->login_lun = unpacked_lun; + login->status_fifo_addr = sbp2_pointer_to_addr(&req->orb.status_fifo); + login->exclusive = LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc)); + login->login_id = atomic_inc_return(&login_id); + + login->tgt_agt = sbp_target_agent_register(login); + if (IS_ERR(login->tgt_agt)) { + ret = PTR_ERR(login->tgt_agt); + pr_err("failed to map command block handler: %d\n", ret); + + sbp_session_release(sess, true); + kfree(login); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL)); + return; + } + + spin_lock_bh(&sess->lock); + list_add_tail(&login->link, &sess->login_list); + spin_unlock_bh(&sess->lock); + +already_logged_in: + response = kzalloc(sizeof(*response), GFP_KERNEL); + if (!response) { + pr_err("failed to allocate login response block\n"); + + sbp_login_release(login, true); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL)); + return; + } + + login_response_len = clamp_val( + LOGIN_ORB_RESPONSE_LENGTH(be32_to_cpu(req->orb.length)), + 12, sizeof(*response)); + response->misc = cpu_to_be32( + ((login_response_len & 0xffff) << 16) | + (login->login_id & 0xffff)); + response->reconnect_hold = cpu_to_be32(sess->reconnect_hold & 0xffff); + addr_to_sbp2_pointer(login->tgt_agt->handler.offset, + &response->command_block_agent); + + ret = sbp_run_transaction(sess->card, TCODE_WRITE_BLOCK_REQUEST, + sess->node_id, sess->generation, sess->speed, + sbp2_pointer_to_addr(&req->orb.ptr2), response, + login_response_len); + if (ret != RCODE_COMPLETE) { + pr_debug("failed to write login response block: %x\n", ret); + + kfree(response); + sbp_login_release(login, true); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR)); + return; + } + + kfree(response); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK)); +} + +static void sbp_management_request_query_logins( + struct sbp_management_agent *agent, struct sbp_management_request *req, + int *status_data_size) +{ + pr_notice("QUERY LOGINS not implemented\n"); + /* FIXME: implement */ + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); +} + +static void sbp_management_request_reconnect( + struct sbp_management_agent *agent, struct sbp_management_request *req, + int *status_data_size) +{ + struct sbp_tport *tport = agent->tport; + struct sbp_tpg *tpg = tport->tpg; + int ret; + u64 guid; + struct sbp_login_descriptor *login; + + ret = read_peer_guid(&guid, req); + if (ret != RCODE_COMPLETE) { + pr_warn("failed to read peer GUID: %d\n", ret); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR)); + return; + } + + pr_notice("mgt_agent RECONNECT from %016llx\n", guid); + + login = sbp_login_find_by_id(tpg, + RECONNECT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc))); + + if (!login) { + pr_err("mgt_agent RECONNECT unknown login ID\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED)); + return; + } + + if (login->sess->guid != guid) { + pr_err("mgt_agent RECONNECT login GUID doesn't match\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED)); + return; + } + + spin_lock_bh(&login->sess->lock); + if (login->sess->card) + fw_card_put(login->sess->card); + + /* update the node details */ + login->sess->generation = req->generation; + login->sess->node_id = req->node_addr; + login->sess->card = fw_card_get(req->card); + login->sess->speed = req->speed; + spin_unlock_bh(&login->sess->lock); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK)); +} + +static void sbp_management_request_logout( + struct sbp_management_agent *agent, struct sbp_management_request *req, + int *status_data_size) +{ + struct sbp_tport *tport = agent->tport; + struct sbp_tpg *tpg = tport->tpg; + int id; + struct sbp_login_descriptor *login; + + id = LOGOUT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc)); + + login = sbp_login_find_by_id(tpg, id); + if (!login) { + pr_warn("cannot find login: %d\n", id); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LOGIN_ID_UNKNOWN)); + return; + } + + pr_info("mgt_agent LOGOUT from LUN %d session %d\n", + login->login_lun, login->login_id); + + if (req->node_addr != login->sess->node_id) { + pr_warn("logout from different node ID\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED)); + return; + } + + sbp_login_release(login, true); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK)); +} + +static void session_check_for_reset(struct sbp_session *sess) +{ + bool card_valid = false; + + spin_lock_bh(&sess->lock); + + if (sess->card) { + spin_lock_irq(&sess->card->lock); + card_valid = (sess->card->local_node != NULL); + spin_unlock_irq(&sess->card->lock); + + if (!card_valid) { + fw_card_put(sess->card); + sess->card = NULL; + } + } + + if (!card_valid || (sess->generation != sess->card->generation)) { + pr_info("Waiting for reconnect from node: %016llx\n", + sess->guid); + + sess->node_id = -1; + sess->reconnect_expires = get_jiffies_64() + + ((sess->reconnect_hold + 1) * HZ); + } + + spin_unlock_bh(&sess->lock); +} + +static void session_reconnect_expired(struct sbp_session *sess) +{ + struct sbp_login_descriptor *login, *temp; + LIST_HEAD(login_list); + + pr_info("Reconnect timer expired for node: %016llx\n", sess->guid); + + spin_lock_bh(&sess->lock); + list_for_each_entry_safe(login, temp, &sess->login_list, link) { + login->sess = NULL; + list_move_tail(&login->link, &login_list); + } + spin_unlock_bh(&sess->lock); + + list_for_each_entry_safe(login, temp, &login_list, link) { + list_del(&login->link); + sbp_login_release(login, false); + } + + sbp_session_release(sess, false); +} + +static void session_maintenance_work(struct work_struct *work) +{ + struct sbp_session *sess = container_of(work, struct sbp_session, + maint_work.work); + + /* could be called while tearing down the session */ + spin_lock_bh(&sess->lock); + if (list_empty(&sess->login_list)) { + spin_unlock_bh(&sess->lock); + return; + } + spin_unlock_bh(&sess->lock); + + if (sess->node_id != -1) { + /* check for bus reset and make node_id invalid */ + session_check_for_reset(sess); + + schedule_delayed_work(&sess->maint_work, + SESSION_MAINTENANCE_INTERVAL); + } else if (!time_after64(get_jiffies_64(), sess->reconnect_expires)) { + /* still waiting for reconnect */ + schedule_delayed_work(&sess->maint_work, + SESSION_MAINTENANCE_INTERVAL); + } else { + /* reconnect timeout has expired */ + session_reconnect_expired(sess); + } +} + +static int tgt_agent_rw_agent_state(struct fw_card *card, int tcode, void *data, + struct sbp_target_agent *agent) +{ + int state; + + switch (tcode) { + case TCODE_READ_QUADLET_REQUEST: + pr_debug("tgt_agent AGENT_STATE READ\n"); + + spin_lock_bh(&agent->lock); + state = agent->state; + spin_unlock_bh(&agent->lock); + + *(__be32 *)data = cpu_to_be32(state); + + return RCODE_COMPLETE; + + case TCODE_WRITE_QUADLET_REQUEST: + /* ignored */ + return RCODE_COMPLETE; + + default: + return RCODE_TYPE_ERROR; + } +} + +static int tgt_agent_rw_agent_reset(struct fw_card *card, int tcode, void *data, + struct sbp_target_agent *agent) +{ + switch (tcode) { + case TCODE_WRITE_QUADLET_REQUEST: + pr_debug("tgt_agent AGENT_RESET\n"); + spin_lock_bh(&agent->lock); + agent->state = AGENT_STATE_RESET; + spin_unlock_bh(&agent->lock); + return RCODE_COMPLETE; + + default: + return RCODE_TYPE_ERROR; + } +} + +static int tgt_agent_rw_orb_pointer(struct fw_card *card, int tcode, void *data, + struct sbp_target_agent *agent) +{ + struct sbp2_pointer *ptr = data; + + switch (tcode) { + case TCODE_WRITE_BLOCK_REQUEST: + spin_lock_bh(&agent->lock); + if (agent->state != AGENT_STATE_SUSPENDED && + agent->state != AGENT_STATE_RESET) { + spin_unlock_bh(&agent->lock); + pr_notice("Ignoring ORB_POINTER write while active.\n"); + return RCODE_CONFLICT_ERROR; + } + agent->state = AGENT_STATE_ACTIVE; + spin_unlock_bh(&agent->lock); + + agent->orb_pointer = sbp2_pointer_to_addr(ptr); + agent->doorbell = false; + + pr_debug("tgt_agent ORB_POINTER write: 0x%llx\n", + agent->orb_pointer); + + queue_work(system_unbound_wq, &agent->work); + + return RCODE_COMPLETE; + + case TCODE_READ_BLOCK_REQUEST: + pr_debug("tgt_agent ORB_POINTER READ\n"); + spin_lock_bh(&agent->lock); + addr_to_sbp2_pointer(agent->orb_pointer, ptr); + spin_unlock_bh(&agent->lock); + return RCODE_COMPLETE; + + default: + return RCODE_TYPE_ERROR; + } +} + +static int tgt_agent_rw_doorbell(struct fw_card *card, int tcode, void *data, + struct sbp_target_agent *agent) +{ + switch (tcode) { + case TCODE_WRITE_QUADLET_REQUEST: + spin_lock_bh(&agent->lock); + if (agent->state != AGENT_STATE_SUSPENDED) { + spin_unlock_bh(&agent->lock); + pr_debug("Ignoring DOORBELL while active.\n"); + return RCODE_CONFLICT_ERROR; + } + agent->state = AGENT_STATE_ACTIVE; + spin_unlock_bh(&agent->lock); + + agent->doorbell = true; + + pr_debug("tgt_agent DOORBELL\n"); + + queue_work(system_unbound_wq, &agent->work); + + return RCODE_COMPLETE; + + case TCODE_READ_QUADLET_REQUEST: + return RCODE_COMPLETE; + + default: + return RCODE_TYPE_ERROR; + } +} + +static int tgt_agent_rw_unsolicited_status_enable(struct fw_card *card, + int tcode, void *data, struct sbp_target_agent *agent) +{ + switch (tcode) { + case TCODE_WRITE_QUADLET_REQUEST: + pr_debug("tgt_agent UNSOLICITED_STATUS_ENABLE\n"); + /* ignored as we don't send unsolicited status */ + return RCODE_COMPLETE; + + case TCODE_READ_QUADLET_REQUEST: + return RCODE_COMPLETE; + + default: + return RCODE_TYPE_ERROR; + } +} + +static void tgt_agent_rw(struct fw_card *card, struct fw_request *request, + int tcode, int destination, int source, int generation, + unsigned long long offset, void *data, size_t length, + void *callback_data) +{ + struct sbp_target_agent *agent = callback_data; + struct sbp_session *sess = agent->login->sess; + int sess_gen, sess_node, rcode; + + spin_lock_bh(&sess->lock); + sess_gen = sess->generation; + sess_node = sess->node_id; + spin_unlock_bh(&sess->lock); + + if (generation != sess_gen) { + pr_notice("ignoring request with wrong generation\n"); + rcode = RCODE_TYPE_ERROR; + goto out; + } + + if (source != sess_node) { + pr_notice("ignoring request from foreign node (%x != %x)\n", + source, sess_node); + rcode = RCODE_TYPE_ERROR; + goto out; + } + + /* turn offset into the offset from the start of the block */ + offset -= agent->handler.offset; + + if (offset == 0x00 && length == 4) { + /* AGENT_STATE */ + rcode = tgt_agent_rw_agent_state(card, tcode, data, agent); + } else if (offset == 0x04 && length == 4) { + /* AGENT_RESET */ + rcode = tgt_agent_rw_agent_reset(card, tcode, data, agent); + } else if (offset == 0x08 && length == 8) { + /* ORB_POINTER */ + rcode = tgt_agent_rw_orb_pointer(card, tcode, data, agent); + } else if (offset == 0x10 && length == 4) { + /* DOORBELL */ + rcode = tgt_agent_rw_doorbell(card, tcode, data, agent); + } else if (offset == 0x14 && length == 4) { + /* UNSOLICITED_STATUS_ENABLE */ + rcode = tgt_agent_rw_unsolicited_status_enable(card, tcode, + data, agent); + } else { + rcode = RCODE_ADDRESS_ERROR; + } + +out: + fw_send_response(card, request, rcode); +} + +static void sbp_handle_command(struct sbp_target_request *); +static int sbp_send_status(struct sbp_target_request *); +static void sbp_free_request(struct sbp_target_request *); + +static void tgt_agent_process_work(struct work_struct *work) +{ + struct sbp_target_request *req = + container_of(work, struct sbp_target_request, work); + + pr_debug("tgt_orb ptr:0x%llx next_ORB:0x%llx data_descriptor:0x%llx misc:0x%x\n", + req->orb_pointer, + sbp2_pointer_to_addr(&req->orb.next_orb), + sbp2_pointer_to_addr(&req->orb.data_descriptor), + be32_to_cpu(req->orb.misc)); + + if (req->orb_pointer >> 32) + pr_debug("ORB with high bits set\n"); + + switch (ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc))) { + case 0:/* Format specified by this standard */ + sbp_handle_command(req); + return; + case 1: /* Reserved for future standardization */ + case 2: /* Vendor-dependent */ + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP( + STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS( + SBP_STATUS_REQ_TYPE_NOTSUPP)); + sbp_send_status(req); + return; + case 3: /* Dummy ORB */ + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP( + STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS( + SBP_STATUS_DUMMY_ORB_COMPLETE)); + sbp_send_status(req); + return; + default: + BUG(); + } +} + +/* used to double-check we haven't been issued an AGENT_RESET */ +static inline bool tgt_agent_check_active(struct sbp_target_agent *agent) +{ + bool active; + + spin_lock_bh(&agent->lock); + active = (agent->state == AGENT_STATE_ACTIVE); + spin_unlock_bh(&agent->lock); + + return active; +} + +static struct sbp_target_request *sbp_mgt_get_req(struct sbp_session *sess, + struct fw_card *card, u64 next_orb) +{ + struct se_session *se_sess = sess->se_sess; + struct sbp_target_request *req; + int tag, cpu; + + tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); + if (tag < 0) + return ERR_PTR(-ENOMEM); + + req = &((struct sbp_target_request *)se_sess->sess_cmd_map)[tag]; + memset(req, 0, sizeof(*req)); + req->se_cmd.map_tag = tag; + req->se_cmd.map_cpu = cpu; + req->se_cmd.tag = next_orb; + + return req; +} + +static void tgt_agent_fetch_work(struct work_struct *work) +{ + struct sbp_target_agent *agent = + container_of(work, struct sbp_target_agent, work); + struct sbp_session *sess = agent->login->sess; + struct sbp_target_request *req; + int ret; + bool doorbell = agent->doorbell; + u64 next_orb = agent->orb_pointer; + + while (next_orb && tgt_agent_check_active(agent)) { + req = sbp_mgt_get_req(sess, sess->card, next_orb); + if (IS_ERR(req)) { + spin_lock_bh(&agent->lock); + agent->state = AGENT_STATE_DEAD; + spin_unlock_bh(&agent->lock); + return; + } + + req->login = agent->login; + req->orb_pointer = next_orb; + + req->status.status = cpu_to_be32(STATUS_BLOCK_ORB_OFFSET_HIGH( + req->orb_pointer >> 32)); + req->status.orb_low = cpu_to_be32( + req->orb_pointer & 0xfffffffc); + + /* read in the ORB */ + ret = sbp_run_transaction(sess->card, TCODE_READ_BLOCK_REQUEST, + sess->node_id, sess->generation, sess->speed, + req->orb_pointer, &req->orb, sizeof(req->orb)); + if (ret != RCODE_COMPLETE) { + pr_debug("tgt_orb fetch failed: %x\n", ret); + req->status.status |= cpu_to_be32( + STATUS_BLOCK_SRC( + STATUS_SRC_ORB_FINISHED) | + STATUS_BLOCK_RESP( + STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_DEAD(1) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS( + SBP_STATUS_UNSPECIFIED_ERROR)); + spin_lock_bh(&agent->lock); + agent->state = AGENT_STATE_DEAD; + spin_unlock_bh(&agent->lock); + + sbp_send_status(req); + return; + } + + /* check the next_ORB field */ + if (be32_to_cpu(req->orb.next_orb.high) & 0x80000000) { + next_orb = 0; + req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC( + STATUS_SRC_ORB_FINISHED)); + } else { + next_orb = sbp2_pointer_to_addr(&req->orb.next_orb); + req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC( + STATUS_SRC_ORB_CONTINUING)); + } + + if (tgt_agent_check_active(agent) && !doorbell) { + INIT_WORK(&req->work, tgt_agent_process_work); + queue_work(system_unbound_wq, &req->work); + } else { + /* don't process this request, just check next_ORB */ + sbp_free_request(req); + } + + spin_lock_bh(&agent->lock); + doorbell = agent->doorbell = false; + + /* check if we should carry on processing */ + if (next_orb) + agent->orb_pointer = next_orb; + else + agent->state = AGENT_STATE_SUSPENDED; + + spin_unlock_bh(&agent->lock); + }; +} + +static struct sbp_target_agent *sbp_target_agent_register( + struct sbp_login_descriptor *login) +{ + struct sbp_target_agent *agent; + int ret; + + agent = kmalloc(sizeof(*agent), GFP_KERNEL); + if (!agent) + return ERR_PTR(-ENOMEM); + + spin_lock_init(&agent->lock); + + agent->handler.length = 0x20; + agent->handler.address_callback = tgt_agent_rw; + agent->handler.callback_data = agent; + + agent->login = login; + agent->state = AGENT_STATE_RESET; + INIT_WORK(&agent->work, tgt_agent_fetch_work); + agent->orb_pointer = 0; + agent->doorbell = false; + + ret = fw_core_add_address_handler(&agent->handler, + &sbp_register_region); + if (ret < 0) { + kfree(agent); + return ERR_PTR(ret); + } + + return agent; +} + +static void sbp_target_agent_unregister(struct sbp_target_agent *agent) +{ + fw_core_remove_address_handler(&agent->handler); + cancel_work_sync(&agent->work); + kfree(agent); +} + +/* + * Simple wrapper around fw_run_transaction that retries the transaction several + * times in case of failure, with an exponential backoff. + */ +static int sbp_run_transaction(struct fw_card *card, int tcode, int destination_id, + int generation, int speed, unsigned long long offset, + void *payload, size_t length) +{ + int attempt, ret, delay; + + for (attempt = 1; attempt <= 5; attempt++) { + ret = fw_run_transaction(card, tcode, destination_id, + generation, speed, offset, payload, length); + + switch (ret) { + case RCODE_COMPLETE: + case RCODE_TYPE_ERROR: + case RCODE_ADDRESS_ERROR: + case RCODE_GENERATION: + return ret; + + default: + delay = 5 * attempt * attempt; + usleep_range(delay, delay * 2); + } + } + + return ret; +} + +/* + * Wrapper around sbp_run_transaction that gets the card, destination, + * generation and speed out of the request's session. + */ +static int sbp_run_request_transaction(struct sbp_target_request *req, + int tcode, unsigned long long offset, void *payload, + size_t length) +{ + struct sbp_login_descriptor *login = req->login; + struct sbp_session *sess = login->sess; + struct fw_card *card; + int node_id, generation, speed, ret; + + spin_lock_bh(&sess->lock); + card = fw_card_get(sess->card); + node_id = sess->node_id; + generation = sess->generation; + speed = sess->speed; + spin_unlock_bh(&sess->lock); + + ret = sbp_run_transaction(card, tcode, node_id, generation, speed, + offset, payload, length); + + fw_card_put(card); + + return ret; +} + +static int sbp_fetch_command(struct sbp_target_request *req) +{ + int ret, cmd_len, copy_len; + + cmd_len = scsi_command_size(req->orb.command_block); + + req->cmd_buf = kmalloc(cmd_len, GFP_KERNEL); + if (!req->cmd_buf) + return -ENOMEM; + + memcpy(req->cmd_buf, req->orb.command_block, + min_t(int, cmd_len, sizeof(req->orb.command_block))); + + if (cmd_len > sizeof(req->orb.command_block)) { + pr_debug("sbp_fetch_command: filling in long command\n"); + copy_len = cmd_len - sizeof(req->orb.command_block); + + ret = sbp_run_request_transaction(req, + TCODE_READ_BLOCK_REQUEST, + req->orb_pointer + sizeof(req->orb), + req->cmd_buf + sizeof(req->orb.command_block), + copy_len); + if (ret != RCODE_COMPLETE) + return -EIO; + } + + return 0; +} + +static int sbp_fetch_page_table(struct sbp_target_request *req) +{ + int pg_tbl_sz, ret; + struct sbp_page_table_entry *pg_tbl; + + if (!CMDBLK_ORB_PG_TBL_PRESENT(be32_to_cpu(req->orb.misc))) + return 0; + + pg_tbl_sz = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc)) * + sizeof(struct sbp_page_table_entry); + + pg_tbl = kmalloc(pg_tbl_sz, GFP_KERNEL); + if (!pg_tbl) + return -ENOMEM; + + ret = sbp_run_request_transaction(req, TCODE_READ_BLOCK_REQUEST, + sbp2_pointer_to_addr(&req->orb.data_descriptor), + pg_tbl, pg_tbl_sz); + if (ret != RCODE_COMPLETE) { + kfree(pg_tbl); + return -EIO; + } + + req->pg_tbl = pg_tbl; + return 0; +} + +static void sbp_calc_data_length_direction(struct sbp_target_request *req, + u32 *data_len, enum dma_data_direction *data_dir) +{ + int data_size, direction, idx; + + data_size = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc)); + direction = CMDBLK_ORB_DIRECTION(be32_to_cpu(req->orb.misc)); + + if (!data_size) { + *data_len = 0; + *data_dir = DMA_NONE; + return; + } + + *data_dir = direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + if (req->pg_tbl) { + *data_len = 0; + for (idx = 0; idx < data_size; idx++) { + *data_len += be16_to_cpu( + req->pg_tbl[idx].segment_length); + } + } else { + *data_len = data_size; + } +} + +static void sbp_handle_command(struct sbp_target_request *req) +{ + struct sbp_login_descriptor *login = req->login; + struct sbp_session *sess = login->sess; + int ret, unpacked_lun; + u32 data_length; + enum dma_data_direction data_dir; + + ret = sbp_fetch_command(req); + if (ret) { + pr_debug("sbp_handle_command: fetch command failed: %d\n", ret); + goto err; + } + + ret = sbp_fetch_page_table(req); + if (ret) { + pr_debug("sbp_handle_command: fetch page table failed: %d\n", + ret); + goto err; + } + + unpacked_lun = req->login->login_lun; + sbp_calc_data_length_direction(req, &data_length, &data_dir); + + pr_debug("sbp_handle_command ORB:0x%llx unpacked_lun:%d data_len:%d data_dir:%d\n", + req->orb_pointer, unpacked_lun, data_length, data_dir); + + /* only used for printk until we do TMRs */ + req->se_cmd.tag = req->orb_pointer; + if (target_submit_cmd(&req->se_cmd, sess->se_sess, req->cmd_buf, + req->sense_buf, unpacked_lun, data_length, + TCM_SIMPLE_TAG, data_dir, TARGET_SCF_ACK_KREF)) + goto err; + + return; + +err: + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR)); + sbp_send_status(req); +} + +/* + * DMA_TO_DEVICE = read from initiator (SCSI WRITE) + * DMA_FROM_DEVICE = write to initiator (SCSI READ) + */ +static int sbp_rw_data(struct sbp_target_request *req) +{ + struct sbp_session *sess = req->login->sess; + int tcode, sg_miter_flags, max_payload, pg_size, speed, node_id, + generation, num_pte, length, tfr_length, + rcode = RCODE_COMPLETE; + struct sbp_page_table_entry *pte; + unsigned long long offset; + struct fw_card *card; + struct sg_mapping_iter iter; + + if (req->se_cmd.data_direction == DMA_FROM_DEVICE) { + tcode = TCODE_WRITE_BLOCK_REQUEST; + sg_miter_flags = SG_MITER_FROM_SG; + } else { + tcode = TCODE_READ_BLOCK_REQUEST; + sg_miter_flags = SG_MITER_TO_SG; + } + + max_payload = 4 << CMDBLK_ORB_MAX_PAYLOAD(be32_to_cpu(req->orb.misc)); + speed = CMDBLK_ORB_SPEED(be32_to_cpu(req->orb.misc)); + + pg_size = CMDBLK_ORB_PG_SIZE(be32_to_cpu(req->orb.misc)); + if (pg_size) { + pr_err("sbp_run_transaction: page size ignored\n"); + pg_size = 0x100 << pg_size; + } + + spin_lock_bh(&sess->lock); + card = fw_card_get(sess->card); + node_id = sess->node_id; + generation = sess->generation; + spin_unlock_bh(&sess->lock); + + if (req->pg_tbl) { + pte = req->pg_tbl; + num_pte = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc)); + + offset = 0; + length = 0; + } else { + pte = NULL; + num_pte = 0; + + offset = sbp2_pointer_to_addr(&req->orb.data_descriptor); + length = req->se_cmd.data_length; + } + + sg_miter_start(&iter, req->se_cmd.t_data_sg, req->se_cmd.t_data_nents, + sg_miter_flags); + + while (length || num_pte) { + if (!length) { + offset = (u64)be16_to_cpu(pte->segment_base_hi) << 32 | + be32_to_cpu(pte->segment_base_lo); + length = be16_to_cpu(pte->segment_length); + + pte++; + num_pte--; + } + + sg_miter_next(&iter); + + tfr_length = min3(length, max_payload, (int)iter.length); + + /* FIXME: take page_size into account */ + + rcode = sbp_run_transaction(card, tcode, node_id, + generation, speed, + offset, iter.addr, tfr_length); + + if (rcode != RCODE_COMPLETE) + break; + + length -= tfr_length; + offset += tfr_length; + iter.consumed = tfr_length; + } + + sg_miter_stop(&iter); + fw_card_put(card); + + if (rcode == RCODE_COMPLETE) { + WARN_ON(length != 0); + return 0; + } else { + return -EIO; + } +} + +static int sbp_send_status(struct sbp_target_request *req) +{ + int rc, ret = 0, length; + struct sbp_login_descriptor *login = req->login; + + length = (((be32_to_cpu(req->status.status) >> 24) & 0x07) + 1) * 4; + + rc = sbp_run_request_transaction(req, TCODE_WRITE_BLOCK_REQUEST, + login->status_fifo_addr, &req->status, length); + if (rc != RCODE_COMPLETE) { + pr_debug("sbp_send_status: write failed: 0x%x\n", rc); + ret = -EIO; + goto put_ref; + } + + pr_debug("sbp_send_status: status write complete for ORB: 0x%llx\n", + req->orb_pointer); + /* + * Drop the extra ACK_KREF reference taken by target_submit_cmd() + * ahead of sbp_check_stop_free() -> transport_generic_free_cmd() + * final se_cmd->cmd_kref put. + */ +put_ref: + target_put_sess_cmd(&req->se_cmd); + return ret; +} + +static void sbp_sense_mangle(struct sbp_target_request *req) +{ + struct se_cmd *se_cmd = &req->se_cmd; + u8 *sense = req->sense_buf; + u8 *status = req->status.data; + + WARN_ON(se_cmd->scsi_sense_length < 18); + + switch (sense[0] & 0x7f) { /* sfmt */ + case 0x70: /* current, fixed */ + status[0] = 0 << 6; + break; + case 0x71: /* deferred, fixed */ + status[0] = 1 << 6; + break; + case 0x72: /* current, descriptor */ + case 0x73: /* deferred, descriptor */ + default: + /* + * TODO: SBP-3 specifies what we should do with descriptor + * format sense data + */ + pr_err("sbp_send_sense: unknown sense format: 0x%x\n", + sense[0]); + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQUEST_ABORTED)); + return; + } + + status[0] |= se_cmd->scsi_status & 0x3f;/* status */ + status[1] = + (sense[0] & 0x80) | /* valid */ + ((sense[2] & 0xe0) >> 1) | /* mark, eom, ili */ + (sense[2] & 0x0f); /* sense_key */ + status[2] = se_cmd->scsi_asc; /* sense_code */ + status[3] = se_cmd->scsi_ascq; /* sense_qualifier */ + + /* information */ + status[4] = sense[3]; + status[5] = sense[4]; + status[6] = sense[5]; + status[7] = sense[6]; + + /* CDB-dependent */ + status[8] = sense[8]; + status[9] = sense[9]; + status[10] = sense[10]; + status[11] = sense[11]; + + /* fru */ + status[12] = sense[14]; + + /* sense_key-dependent */ + status[13] = sense[15]; + status[14] = sense[16]; + status[15] = sense[17]; + + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(5) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK)); +} + +static int sbp_send_sense(struct sbp_target_request *req) +{ + struct se_cmd *se_cmd = &req->se_cmd; + + if (se_cmd->scsi_sense_length) { + sbp_sense_mangle(req); + } else { + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK)); + } + + return sbp_send_status(req); +} + +static void sbp_free_request(struct sbp_target_request *req) +{ + struct se_cmd *se_cmd = &req->se_cmd; + struct se_session *se_sess = se_cmd->se_sess; + + kfree(req->pg_tbl); + kfree(req->cmd_buf); + + target_free_tag(se_sess, se_cmd); +} + +static void sbp_mgt_agent_process(struct work_struct *work) +{ + struct sbp_management_agent *agent = + container_of(work, struct sbp_management_agent, work); + struct sbp_management_request *req = agent->request; + int ret; + int status_data_len = 0; + + /* fetch the ORB from the initiator */ + ret = sbp_run_transaction(req->card, TCODE_READ_BLOCK_REQUEST, + req->node_addr, req->generation, req->speed, + agent->orb_offset, &req->orb, sizeof(req->orb)); + if (ret != RCODE_COMPLETE) { + pr_debug("mgt_orb fetch failed: %x\n", ret); + goto out; + } + + pr_debug("mgt_orb ptr1:0x%llx ptr2:0x%llx misc:0x%x len:0x%x status_fifo:0x%llx\n", + sbp2_pointer_to_addr(&req->orb.ptr1), + sbp2_pointer_to_addr(&req->orb.ptr2), + be32_to_cpu(req->orb.misc), be32_to_cpu(req->orb.length), + sbp2_pointer_to_addr(&req->orb.status_fifo)); + + if (!ORB_NOTIFY(be32_to_cpu(req->orb.misc)) || + ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc)) != 0) { + pr_err("mgt_orb bad request\n"); + goto out; + } + + switch (MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc))) { + case MANAGEMENT_ORB_FUNCTION_LOGIN: + sbp_management_request_login(agent, req, &status_data_len); + break; + + case MANAGEMENT_ORB_FUNCTION_QUERY_LOGINS: + sbp_management_request_query_logins(agent, req, + &status_data_len); + break; + + case MANAGEMENT_ORB_FUNCTION_RECONNECT: + sbp_management_request_reconnect(agent, req, &status_data_len); + break; + + case MANAGEMENT_ORB_FUNCTION_SET_PASSWORD: + pr_notice("SET PASSWORD not implemented\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); + + break; + + case MANAGEMENT_ORB_FUNCTION_LOGOUT: + sbp_management_request_logout(agent, req, &status_data_len); + break; + + case MANAGEMENT_ORB_FUNCTION_ABORT_TASK: + pr_notice("ABORT TASK not implemented\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); + + break; + + case MANAGEMENT_ORB_FUNCTION_ABORT_TASK_SET: + pr_notice("ABORT TASK SET not implemented\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); + + break; + + case MANAGEMENT_ORB_FUNCTION_LOGICAL_UNIT_RESET: + pr_notice("LOGICAL UNIT RESET not implemented\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); + + break; + + case MANAGEMENT_ORB_FUNCTION_TARGET_RESET: + pr_notice("TARGET RESET not implemented\n"); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); + + break; + + default: + pr_notice("unknown management function 0x%x\n", + MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc))); + + req->status.status = cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP)); + + break; + } + + req->status.status |= cpu_to_be32( + STATUS_BLOCK_SRC(1) | /* Response to ORB, next_ORB absent */ + STATUS_BLOCK_LEN(DIV_ROUND_UP(status_data_len, 4) + 1) | + STATUS_BLOCK_ORB_OFFSET_HIGH(agent->orb_offset >> 32)); + req->status.orb_low = cpu_to_be32(agent->orb_offset); + + /* write the status block back to the initiator */ + ret = sbp_run_transaction(req->card, TCODE_WRITE_BLOCK_REQUEST, + req->node_addr, req->generation, req->speed, + sbp2_pointer_to_addr(&req->orb.status_fifo), + &req->status, 8 + status_data_len); + if (ret != RCODE_COMPLETE) { + pr_debug("mgt_orb status write failed: %x\n", ret); + goto out; + } + +out: + fw_card_put(req->card); + kfree(req); + + spin_lock_bh(&agent->lock); + agent->state = MANAGEMENT_AGENT_STATE_IDLE; + spin_unlock_bh(&agent->lock); +} + +static void sbp_mgt_agent_rw(struct fw_card *card, + struct fw_request *request, int tcode, int destination, int source, + int generation, unsigned long long offset, void *data, size_t length, + void *callback_data) +{ + struct sbp_management_agent *agent = callback_data; + struct sbp2_pointer *ptr = data; + int rcode = RCODE_ADDRESS_ERROR; + + if (!agent->tport->enable) + goto out; + + if ((offset != agent->handler.offset) || (length != 8)) + goto out; + + if (tcode == TCODE_WRITE_BLOCK_REQUEST) { + struct sbp_management_request *req; + int prev_state; + + spin_lock_bh(&agent->lock); + prev_state = agent->state; + agent->state = MANAGEMENT_AGENT_STATE_BUSY; + spin_unlock_bh(&agent->lock); + + if (prev_state == MANAGEMENT_AGENT_STATE_BUSY) { + pr_notice("ignoring management request while busy\n"); + rcode = RCODE_CONFLICT_ERROR; + goto out; + } + req = kzalloc(sizeof(*req), GFP_ATOMIC); + if (!req) { + rcode = RCODE_CONFLICT_ERROR; + goto out; + } + + req->card = fw_card_get(card); + req->generation = generation; + req->node_addr = source; + req->speed = fw_get_request_speed(request); + + agent->orb_offset = sbp2_pointer_to_addr(ptr); + agent->request = req; + + queue_work(system_unbound_wq, &agent->work); + rcode = RCODE_COMPLETE; + } else if (tcode == TCODE_READ_BLOCK_REQUEST) { + addr_to_sbp2_pointer(agent->orb_offset, ptr); + rcode = RCODE_COMPLETE; + } else { + rcode = RCODE_TYPE_ERROR; + } + +out: + fw_send_response(card, request, rcode); +} + +static struct sbp_management_agent *sbp_management_agent_register( + struct sbp_tport *tport) +{ + int ret; + struct sbp_management_agent *agent; + + agent = kmalloc(sizeof(*agent), GFP_KERNEL); + if (!agent) + return ERR_PTR(-ENOMEM); + + spin_lock_init(&agent->lock); + agent->tport = tport; + agent->handler.length = 0x08; + agent->handler.address_callback = sbp_mgt_agent_rw; + agent->handler.callback_data = agent; + agent->state = MANAGEMENT_AGENT_STATE_IDLE; + INIT_WORK(&agent->work, sbp_mgt_agent_process); + agent->orb_offset = 0; + agent->request = NULL; + + ret = fw_core_add_address_handler(&agent->handler, + &sbp_register_region); + if (ret < 0) { + kfree(agent); + return ERR_PTR(ret); + } + + return agent; +} + +static void sbp_management_agent_unregister(struct sbp_management_agent *agent) +{ + fw_core_remove_address_handler(&agent->handler); + cancel_work_sync(&agent->work); + kfree(agent); +} + +static int sbp_check_true(struct se_portal_group *se_tpg) +{ + return 1; +} + +static int sbp_check_false(struct se_portal_group *se_tpg) +{ + return 0; +} + +static char *sbp_get_fabric_wwn(struct se_portal_group *se_tpg) +{ + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + + return &tport->tport_name[0]; +} + +static u16 sbp_get_tag(struct se_portal_group *se_tpg) +{ + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + return tpg->tport_tpgt; +} + +static u32 sbp_tpg_get_inst_index(struct se_portal_group *se_tpg) +{ + return 1; +} + +static void sbp_release_cmd(struct se_cmd *se_cmd) +{ + struct sbp_target_request *req = container_of(se_cmd, + struct sbp_target_request, se_cmd); + + sbp_free_request(req); +} + +static u32 sbp_sess_get_index(struct se_session *se_sess) +{ + return 0; +} + +static int sbp_write_pending(struct se_cmd *se_cmd) +{ + struct sbp_target_request *req = container_of(se_cmd, + struct sbp_target_request, se_cmd); + int ret; + + ret = sbp_rw_data(req); + if (ret) { + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP( + STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS( + SBP_STATUS_UNSPECIFIED_ERROR)); + sbp_send_status(req); + return ret; + } + + target_execute_cmd(se_cmd); + return 0; +} + +static void sbp_set_default_node_attrs(struct se_node_acl *nacl) +{ + return; +} + +static int sbp_get_cmd_state(struct se_cmd *se_cmd) +{ + return 0; +} + +static int sbp_queue_data_in(struct se_cmd *se_cmd) +{ + struct sbp_target_request *req = container_of(se_cmd, + struct sbp_target_request, se_cmd); + int ret; + + ret = sbp_rw_data(req); + if (ret) { + req->status.status |= cpu_to_be32( + STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) | + STATUS_BLOCK_DEAD(0) | + STATUS_BLOCK_LEN(1) | + STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR)); + sbp_send_status(req); + return ret; + } + + return sbp_send_sense(req); +} + +/* + * Called after command (no data transfer) or after the write (to device) + * operation is completed + */ +static int sbp_queue_status(struct se_cmd *se_cmd) +{ + struct sbp_target_request *req = container_of(se_cmd, + struct sbp_target_request, se_cmd); + + return sbp_send_sense(req); +} + +static void sbp_queue_tm_rsp(struct se_cmd *se_cmd) +{ +} + +static void sbp_aborted_task(struct se_cmd *se_cmd) +{ + return; +} + +static int sbp_check_stop_free(struct se_cmd *se_cmd) +{ + struct sbp_target_request *req = container_of(se_cmd, + struct sbp_target_request, se_cmd); + + return transport_generic_free_cmd(&req->se_cmd, 0); +} + +static int sbp_count_se_tpg_luns(struct se_portal_group *tpg) +{ + struct se_lun *lun; + int count = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) + count++; + rcu_read_unlock(); + + return count; +} + +static int sbp_update_unit_directory(struct sbp_tport *tport) +{ + struct se_lun *lun; + int num_luns, num_entries, idx = 0, mgt_agt_addr, ret; + u32 *data; + + if (tport->unit_directory.data) { + fw_core_remove_descriptor(&tport->unit_directory); + kfree(tport->unit_directory.data); + tport->unit_directory.data = NULL; + } + + if (!tport->enable || !tport->tpg) + return 0; + + num_luns = sbp_count_se_tpg_luns(&tport->tpg->se_tpg); + + /* + * Number of entries in the final unit directory: + * - all of those in the template + * - management_agent + * - unit_characteristics + * - reconnect_timeout + * - unit unique ID + * - one for each LUN + * + * MUST NOT include leaf or sub-directory entries + */ + num_entries = ARRAY_SIZE(sbp_unit_directory_template) + 4 + num_luns; + + if (tport->directory_id != -1) + num_entries++; + + /* allocate num_entries + 4 for the header and unique ID leaf */ + data = kcalloc((num_entries + 4), sizeof(u32), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* directory_length */ + data[idx++] = num_entries << 16; + + /* directory_id */ + if (tport->directory_id != -1) + data[idx++] = (CSR_DIRECTORY_ID << 24) | tport->directory_id; + + /* unit directory template */ + memcpy(&data[idx], sbp_unit_directory_template, + sizeof(sbp_unit_directory_template)); + idx += ARRAY_SIZE(sbp_unit_directory_template); + + /* management_agent */ + mgt_agt_addr = (tport->mgt_agt->handler.offset - CSR_REGISTER_BASE) / 4; + data[idx++] = 0x54000000 | (mgt_agt_addr & 0x00ffffff); + + /* unit_characteristics */ + data[idx++] = 0x3a000000 | + (((tport->mgt_orb_timeout * 2) << 8) & 0xff00) | + SBP_ORB_FETCH_SIZE; + + /* reconnect_timeout */ + data[idx++] = 0x3d000000 | (tport->max_reconnect_timeout & 0xffff); + + /* unit unique ID (leaf is just after LUNs) */ + data[idx++] = 0x8d000000 | (num_luns + 1); + + rcu_read_lock(); + hlist_for_each_entry_rcu(lun, &tport->tpg->se_tpg.tpg_lun_hlist, link) { + struct se_device *dev; + int type; + /* + * rcu_dereference_raw protected by se_lun->lun_group symlink + * reference to se_device->dev_group. + */ + dev = rcu_dereference_raw(lun->lun_se_dev); + type = dev->transport->get_device_type(dev); + + /* logical_unit_number */ + data[idx++] = 0x14000000 | + ((type << 16) & 0x1f0000) | + (lun->unpacked_lun & 0xffff); + } + rcu_read_unlock(); + + /* unit unique ID leaf */ + data[idx++] = 2 << 16; + data[idx++] = tport->guid >> 32; + data[idx++] = tport->guid; + + tport->unit_directory.length = idx; + tport->unit_directory.key = (CSR_DIRECTORY | CSR_UNIT) << 24; + tport->unit_directory.data = data; + + ret = fw_core_add_descriptor(&tport->unit_directory); + if (ret < 0) { + kfree(tport->unit_directory.data); + tport->unit_directory.data = NULL; + } + + return ret; +} + +static ssize_t sbp_parse_wwn(const char *name, u64 *wwn) +{ + const char *cp; + char c, nibble; + int pos = 0, err; + + *wwn = 0; + for (cp = name; cp < &name[SBP_NAMELEN - 1]; cp++) { + c = *cp; + if (c == '\n' && cp[1] == '\0') + continue; + if (c == '\0') { + err = 2; + if (pos != 16) + goto fail; + return cp - name; + } + err = 3; + if (isdigit(c)) + nibble = c - '0'; + else if (isxdigit(c)) + nibble = tolower(c) - 'a' + 10; + else + goto fail; + *wwn = (*wwn << 4) | nibble; + pos++; + } + err = 4; +fail: + printk(KERN_INFO "err %u len %zu pos %u\n", + err, cp - name, pos); + return -1; +} + +static ssize_t sbp_format_wwn(char *buf, size_t len, u64 wwn) +{ + return snprintf(buf, len, "%016llx", wwn); +} + +static int sbp_init_nodeacl(struct se_node_acl *se_nacl, const char *name) +{ + u64 guid = 0; + + if (sbp_parse_wwn(name, &guid) < 0) + return -EINVAL; + return 0; +} + +static int sbp_post_link_lun( + struct se_portal_group *se_tpg, + struct se_lun *se_lun) +{ + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + + return sbp_update_unit_directory(tpg->tport); +} + +static void sbp_pre_unlink_lun( + struct se_portal_group *se_tpg, + struct se_lun *se_lun) +{ + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + int ret; + + if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) + tport->enable = 0; + + ret = sbp_update_unit_directory(tport); + if (ret < 0) + pr_err("unlink LUN: failed to update unit directory\n"); +} + +static struct se_portal_group *sbp_make_tpg(struct se_wwn *wwn, + const char *name) +{ + struct sbp_tport *tport = + container_of(wwn, struct sbp_tport, tport_wwn); + + struct sbp_tpg *tpg; + unsigned long tpgt; + int ret; + + if (strstr(name, "tpgt_") != name) + return ERR_PTR(-EINVAL); + if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX) + return ERR_PTR(-EINVAL); + + if (tport->tpg) { + pr_err("Only one TPG per Unit is possible.\n"); + return ERR_PTR(-EBUSY); + } + + tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); + if (!tpg) + return ERR_PTR(-ENOMEM); + + tpg->tport = tport; + tpg->tport_tpgt = tpgt; + tport->tpg = tpg; + + /* default attribute values */ + tport->enable = 0; + tport->directory_id = -1; + tport->mgt_orb_timeout = 15; + tport->max_reconnect_timeout = 5; + tport->max_logins_per_lun = 1; + + tport->mgt_agt = sbp_management_agent_register(tport); + if (IS_ERR(tport->mgt_agt)) { + ret = PTR_ERR(tport->mgt_agt); + goto out_free_tpg; + } + + ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SBP); + if (ret < 0) + goto out_unreg_mgt_agt; + + return &tpg->se_tpg; + +out_unreg_mgt_agt: + sbp_management_agent_unregister(tport->mgt_agt); +out_free_tpg: + tport->tpg = NULL; + kfree(tpg); + return ERR_PTR(ret); +} + +static void sbp_drop_tpg(struct se_portal_group *se_tpg) +{ + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + + core_tpg_deregister(se_tpg); + sbp_management_agent_unregister(tport->mgt_agt); + tport->tpg = NULL; + kfree(tpg); +} + +static struct se_wwn *sbp_make_tport( + struct target_fabric_configfs *tf, + struct config_group *group, + const char *name) +{ + struct sbp_tport *tport; + u64 guid = 0; + + if (sbp_parse_wwn(name, &guid) < 0) + return ERR_PTR(-EINVAL); + + tport = kzalloc(sizeof(*tport), GFP_KERNEL); + if (!tport) + return ERR_PTR(-ENOMEM); + + tport->guid = guid; + sbp_format_wwn(tport->tport_name, SBP_NAMELEN, guid); + + return &tport->tport_wwn; +} + +static void sbp_drop_tport(struct se_wwn *wwn) +{ + struct sbp_tport *tport = + container_of(wwn, struct sbp_tport, tport_wwn); + + kfree(tport); +} + +static ssize_t sbp_wwn_version_show(struct config_item *item, char *page) +{ + return sprintf(page, "FireWire SBP fabric module %s\n", SBP_VERSION); +} + +CONFIGFS_ATTR_RO(sbp_wwn_, version); + +static struct configfs_attribute *sbp_wwn_attrs[] = { + &sbp_wwn_attr_version, + NULL, +}; + +static ssize_t sbp_tpg_directory_id_show(struct config_item *item, char *page) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + + if (tport->directory_id == -1) + return sprintf(page, "implicit\n"); + else + return sprintf(page, "%06x\n", tport->directory_id); +} + +static ssize_t sbp_tpg_directory_id_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + unsigned long val; + + if (tport->enable) { + pr_err("Cannot change the directory_id on an active target.\n"); + return -EBUSY; + } + + if (strstr(page, "implicit") == page) { + tport->directory_id = -1; + } else { + if (kstrtoul(page, 16, &val) < 0) + return -EINVAL; + if (val > 0xffffff) + return -EINVAL; + + tport->directory_id = val; + } + + return count; +} + +static ssize_t sbp_tpg_enable_show(struct config_item *item, char *page) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + return sprintf(page, "%d\n", tport->enable); +} + +static ssize_t sbp_tpg_enable_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_portal_group *se_tpg = to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + unsigned long val; + int ret; + + if (kstrtoul(page, 0, &val) < 0) + return -EINVAL; + if ((val != 0) && (val != 1)) + return -EINVAL; + + if (tport->enable == val) + return count; + + if (val) { + if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) { + pr_err("Cannot enable a target with no LUNs!\n"); + return -EINVAL; + } + } else { + /* XXX: force-shutdown sessions instead? */ + spin_lock_bh(&se_tpg->session_lock); + if (!list_empty(&se_tpg->tpg_sess_list)) { + spin_unlock_bh(&se_tpg->session_lock); + return -EBUSY; + } + spin_unlock_bh(&se_tpg->session_lock); + } + + tport->enable = val; + + ret = sbp_update_unit_directory(tport); + if (ret < 0) { + pr_err("Could not update Config ROM\n"); + return ret; + } + + return count; +} + +CONFIGFS_ATTR(sbp_tpg_, directory_id); +CONFIGFS_ATTR(sbp_tpg_, enable); + +static struct configfs_attribute *sbp_tpg_base_attrs[] = { + &sbp_tpg_attr_directory_id, + &sbp_tpg_attr_enable, + NULL, +}; + +static ssize_t sbp_tpg_attrib_mgt_orb_timeout_show(struct config_item *item, + char *page) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + return sprintf(page, "%d\n", tport->mgt_orb_timeout); +} + +static ssize_t sbp_tpg_attrib_mgt_orb_timeout_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + unsigned long val; + int ret; + + if (kstrtoul(page, 0, &val) < 0) + return -EINVAL; + if ((val < 1) || (val > 127)) + return -EINVAL; + + if (tport->mgt_orb_timeout == val) + return count; + + tport->mgt_orb_timeout = val; + + ret = sbp_update_unit_directory(tport); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t sbp_tpg_attrib_max_reconnect_timeout_show(struct config_item *item, + char *page) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + return sprintf(page, "%d\n", tport->max_reconnect_timeout); +} + +static ssize_t sbp_tpg_attrib_max_reconnect_timeout_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + unsigned long val; + int ret; + + if (kstrtoul(page, 0, &val) < 0) + return -EINVAL; + if ((val < 1) || (val > 32767)) + return -EINVAL; + + if (tport->max_reconnect_timeout == val) + return count; + + tport->max_reconnect_timeout = val; + + ret = sbp_update_unit_directory(tport); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t sbp_tpg_attrib_max_logins_per_lun_show(struct config_item *item, + char *page) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + return sprintf(page, "%d\n", tport->max_logins_per_lun); +} + +static ssize_t sbp_tpg_attrib_max_logins_per_lun_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_portal_group *se_tpg = attrib_to_tpg(item); + struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); + struct sbp_tport *tport = tpg->tport; + unsigned long val; + + if (kstrtoul(page, 0, &val) < 0) + return -EINVAL; + if ((val < 1) || (val > 127)) + return -EINVAL; + + /* XXX: also check against current count? */ + + tport->max_logins_per_lun = val; + + return count; +} + +CONFIGFS_ATTR(sbp_tpg_attrib_, mgt_orb_timeout); +CONFIGFS_ATTR(sbp_tpg_attrib_, max_reconnect_timeout); +CONFIGFS_ATTR(sbp_tpg_attrib_, max_logins_per_lun); + +static struct configfs_attribute *sbp_tpg_attrib_attrs[] = { + &sbp_tpg_attrib_attr_mgt_orb_timeout, + &sbp_tpg_attrib_attr_max_reconnect_timeout, + &sbp_tpg_attrib_attr_max_logins_per_lun, + NULL, +}; + +static const struct target_core_fabric_ops sbp_ops = { + .module = THIS_MODULE, + .fabric_name = "sbp", + .tpg_get_wwn = sbp_get_fabric_wwn, + .tpg_get_tag = sbp_get_tag, + .tpg_check_demo_mode = sbp_check_true, + .tpg_check_demo_mode_cache = sbp_check_true, + .tpg_check_demo_mode_write_protect = sbp_check_false, + .tpg_check_prod_mode_write_protect = sbp_check_false, + .tpg_get_inst_index = sbp_tpg_get_inst_index, + .release_cmd = sbp_release_cmd, + .sess_get_index = sbp_sess_get_index, + .write_pending = sbp_write_pending, + .set_default_node_attributes = sbp_set_default_node_attrs, + .get_cmd_state = sbp_get_cmd_state, + .queue_data_in = sbp_queue_data_in, + .queue_status = sbp_queue_status, + .queue_tm_rsp = sbp_queue_tm_rsp, + .aborted_task = sbp_aborted_task, + .check_stop_free = sbp_check_stop_free, + + .fabric_make_wwn = sbp_make_tport, + .fabric_drop_wwn = sbp_drop_tport, + .fabric_make_tpg = sbp_make_tpg, + .fabric_drop_tpg = sbp_drop_tpg, + .fabric_post_link = sbp_post_link_lun, + .fabric_pre_unlink = sbp_pre_unlink_lun, + .fabric_make_np = NULL, + .fabric_drop_np = NULL, + .fabric_init_nodeacl = sbp_init_nodeacl, + + .tfc_wwn_attrs = sbp_wwn_attrs, + .tfc_tpg_base_attrs = sbp_tpg_base_attrs, + .tfc_tpg_attrib_attrs = sbp_tpg_attrib_attrs, +}; + +static int __init sbp_init(void) +{ + return target_register_template(&sbp_ops); +}; + +static void __exit sbp_exit(void) +{ + target_unregister_template(&sbp_ops); +}; + +MODULE_DESCRIPTION("FireWire SBP fabric driver"); +MODULE_LICENSE("GPL"); +module_init(sbp_init); +module_exit(sbp_exit); |