kvj
/
linux-zen-desktop
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linux-zen-desktop/drivers/target/sbp/sbp_target.c

2297 lines
58 KiB
C
Raw Blame History

// 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 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 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 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 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,
.release_cmd = sbp_release_cmd,
.write_pending = sbp_write_pending,
.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);
Reference in New Issue View Git Blame Copy Permalink