| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Chris Boot | 10114 | 94.30% | 3 | 9.09% |
| Nicholas Bellinger | 299 | 2.79% | 6 | 18.18% |
| Christoph Hellwig | 211 | 1.97% | 7 | 21.21% |
| Roland Dreier | 43 | 0.40% | 1 | 3.03% |
| Bart Van Assche | 15 | 0.14% | 3 | 9.09% |
| Matthew Wilcox | 14 | 0.13% | 2 | 6.06% |
| Dmitry Bogdanov | 11 | 0.10% | 1 | 3.03% |
| David Disseldorp | 6 | 0.06% | 2 | 6.06% |
| Stefan Richter | 4 | 0.04% | 1 | 3.03% |
| Michael Christie | 3 | 0.03% | 3 | 9.09% |
| Thomas Gleixner | 2 | 0.02% | 1 | 3.03% |
| Asias He | 1 | 0.01% | 1 | 3.03% |
| Jörn Engel | 1 | 0.01% | 1 | 3.03% |
| Wei Yongjun | 1 | 0.01% | 1 | 3.03% |
| Total | 10725 | 33 |
// 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; 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); 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"); } 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] = 0; /* XXX sense_code */ status[3] = 0; /* XXX 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 int sbp_enable_tpg(struct se_portal_group *se_tpg, bool enable) { struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg); struct sbp_tport *tport = tpg->tport; int ret; if (enable) { 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 = enable; ret = sbp_update_unit_directory(tport); if (ret < 0) { pr_err("Could not update Config ROM\n"); return ret; } return 0; } CONFIGFS_ATTR(sbp_tpg_, directory_id); static struct configfs_attribute *sbp_tpg_base_attrs[] = { &sbp_tpg_attr_directory_id, 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_enable_tpg = sbp_enable_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);
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