int iscsit_get_lun_for_tmr(
struct iscsi_cmd *cmd,
u64 lun)
{
u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
return transport_lookup_tmr_lun(&cmd->se_cmd, unpacked_lun);
}
static void ft_send_work(struct work_struct *work)
{
struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
struct fcp_cmnd *fcp;
int data_dir = 0;
int task_attr;
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
if (!fcp)
goto err;
if (fcp->fc_flags & FCP_CFL_LEN_MASK)
goto err;
if (fcp->fc_tm_flags) {
ft_send_tm(cmd);
return;
}
switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
case 0:
data_dir = DMA_NONE;
break;
case FCP_CFL_RDDATA:
data_dir = DMA_FROM_DEVICE;
break;
case FCP_CFL_WRDATA:
data_dir = DMA_TO_DEVICE;
break;
case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
goto err;
}
switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
case FCP_PTA_HEADQ:
task_attr = MSG_HEAD_TAG;
break;
case FCP_PTA_ORDERED:
task_attr = MSG_ORDERED_TAG;
break;
case FCP_PTA_ACA:
task_attr = MSG_ACA_TAG;
break;
case FCP_PTA_SIMPLE:
default:
task_attr = MSG_SIMPLE_TAG;
}
fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb,
&cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
ntohl(fcp->fc_dl), task_attr, data_dir, 0);
pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl);
return;
err:
ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
}
static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zfcp_port *port = dev_get_drvdata(dev);
struct zfcp_unit *unit;
u64 fcp_lun;
LIST_HEAD(unit_remove_lh);
struct scsi_device *sdev;
mutex_lock(&zfcp_data.config_mutex);
if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE) {
mutex_unlock(&zfcp_data.config_mutex);
return -EBUSY;
}
if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun)) {
mutex_unlock(&zfcp_data.config_mutex);
return -EINVAL;
}
read_lock_irq(&zfcp_data.config_lock);
unit = zfcp_get_unit_by_lun(port, fcp_lun);
read_unlock_irq(&zfcp_data.config_lock);
if (!unit) {
mutex_unlock(&zfcp_data.config_mutex);
return -ENXIO;
}
zfcp_unit_get(unit);
mutex_unlock(&zfcp_data.config_mutex);
sdev = scsi_device_lookup(port->adapter->scsi_host, 0,
port->starget_id,
scsilun_to_int((struct scsi_lun *)&fcp_lun));
if (sdev) {
scsi_remove_device(sdev);
scsi_device_put(sdev);
}
mutex_lock(&zfcp_data.config_mutex);
zfcp_unit_put(unit);
if (atomic_read(&unit->refcount)) {
mutex_unlock(&zfcp_data.config_mutex);
return -ENXIO;
}
write_lock_irq(&zfcp_data.config_lock);
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
list_move(&unit->list, &unit_remove_lh);
write_unlock_irq(&zfcp_data.config_lock);
mutex_unlock(&zfcp_data.config_mutex);
zfcp_erp_unit_shutdown(unit, 0, "syurs_1", NULL);
zfcp_erp_wait(unit->port->adapter);
zfcp_unit_dequeue(unit);
return (ssize_t)count;
}
int iscsit_get_lun_for_cmd(
struct iscsi_cmd *cmd,
unsigned char *cdb,
u64 lun)
{
u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
return transport_lookup_cmd_lun(&cmd->se_cmd, unpacked_lun);
}
static ssize_t zfcp_sysfs_unit_remove_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
struct zfcp_unit *unit;
u64 fcp_lun;
int retval = -EINVAL;
struct scsi_device *sdev;
if (!(port && get_device(&port->dev)))
return -EBUSY;
if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun))
goto out;
unit = zfcp_get_unit_by_lun(port, fcp_lun);
if (!unit)
goto out;
else
retval = 0;
sdev = scsi_device_lookup(port->adapter->scsi_host, 0,
port->starget_id,
scsilun_to_int((struct scsi_lun *)&fcp_lun));
if (sdev) {
scsi_remove_device(sdev);
scsi_device_put(sdev);
}
write_lock_irq(&port->unit_list_lock);
list_del(&unit->list);
write_unlock_irq(&port->unit_list_lock);
put_device(&unit->dev);
zfcp_erp_unit_shutdown(unit, 0, "syurs_1", NULL);
zfcp_device_unregister(&unit->dev, &zfcp_sysfs_unit_attrs);
out:
put_device(&port->dev);
return retval ? retval : (ssize_t) count;
}
/*
* Handle Task Management Request.
*/
static void ft_send_tm(struct ft_cmd *cmd)
{
struct fcp_cmnd *fcp;
int rc;
u8 tm_func;
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
switch (fcp->fc_tm_flags) {
case FCP_TMF_LUN_RESET:
tm_func = TMR_LUN_RESET;
break;
case FCP_TMF_TGT_RESET:
tm_func = TMR_TARGET_WARM_RESET;
break;
case FCP_TMF_CLR_TASK_SET:
tm_func = TMR_CLEAR_TASK_SET;
break;
case FCP_TMF_ABT_TASK_SET:
tm_func = TMR_ABORT_TASK_SET;
break;
case FCP_TMF_CLR_ACA:
tm_func = TMR_CLEAR_ACA;
break;
default:
/*
* FCP4r01 indicates having a combination of
* tm_flags set is invalid.
*/
pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
return;
}
/* FIXME: Add referenced task tag for ABORT_TASK */
rc = target_submit_tmr(&cmd->se_cmd, cmd->sess->se_sess,
&cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
cmd, tm_func, GFP_KERNEL, 0, 0);
if (rc < 0)
ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
}
/*
* Send new command to target.
*/
static void ft_send_work(struct work_struct *work)
{
struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
struct fcp_cmnd *fcp;
int data_dir = 0;
int task_attr;
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
if (!fcp)
goto err;
if (fcp->fc_flags & FCP_CFL_LEN_MASK)
goto err; /* not handling longer CDBs yet */
/*
* Check for FCP task management flags
*/
if (fcp->fc_tm_flags) {
ft_send_tm(cmd);
return;
}
switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
case 0:
data_dir = DMA_NONE;
break;
case FCP_CFL_RDDATA:
data_dir = DMA_FROM_DEVICE;
break;
case FCP_CFL_WRDATA:
data_dir = DMA_TO_DEVICE;
break;
case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
goto err; /* TBD not supported by tcm_fc yet */
}
/*
* Locate the SAM Task Attr from fc_pri_ta
*/
switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
case FCP_PTA_HEADQ:
task_attr = MSG_HEAD_TAG;
break;
case FCP_PTA_ORDERED:
task_attr = MSG_ORDERED_TAG;
break;
case FCP_PTA_ACA:
task_attr = MSG_ACA_TAG;
break;
case FCP_PTA_SIMPLE: /* Fallthrough */
default:
task_attr = MSG_SIMPLE_TAG;
}
fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
/*
* Use a single se_cmd->cmd_kref as we expect to release se_cmd
* directly from ft_check_stop_free callback in response path.
*/
if (target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, fcp->fc_cdb,
&cmd->ft_sense_buffer[0], scsilun_to_int(&fcp->fc_lun),
ntohl(fcp->fc_dl), task_attr, data_dir, 0))
goto err;
pr_debug("r_ctl %x alloc target_submit_cmd\n", fh->fh_r_ctl);
return;
err:
ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
}
/*
* Send new command to target.
*/
static void ft_send_cmd(struct ft_cmd *cmd)
{
struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
struct se_cmd *se_cmd;
struct fcp_cmnd *fcp;
int data_dir;
u32 data_len;
int task_attr;
int ret;
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
if (!fcp)
goto err;
if (fcp->fc_flags & FCP_CFL_LEN_MASK)
goto err; /* not handling longer CDBs yet */
if (fcp->fc_tm_flags) {
task_attr = FCP_PTA_SIMPLE;
data_dir = DMA_NONE;
data_len = 0;
} else {
switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
case 0:
data_dir = DMA_NONE;
break;
case FCP_CFL_RDDATA:
data_dir = DMA_FROM_DEVICE;
break;
case FCP_CFL_WRDATA:
data_dir = DMA_TO_DEVICE;
break;
case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
goto err; /* TBD not supported by tcm_fc yet */
}
/*
* Locate the SAM Task Attr from fc_pri_ta
*/
switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
case FCP_PTA_HEADQ:
task_attr = MSG_HEAD_TAG;
break;
case FCP_PTA_ORDERED:
task_attr = MSG_ORDERED_TAG;
break;
case FCP_PTA_ACA:
task_attr = MSG_ACA_TAG;
break;
case FCP_PTA_SIMPLE: /* Fallthrough */
default:
task_attr = MSG_SIMPLE_TAG;
}
task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
data_len = ntohl(fcp->fc_dl);
cmd->cdb = fcp->fc_cdb;
}
se_cmd = &cmd->se_cmd;
/*
* Initialize struct se_cmd descriptor from target_core_mod
* infrastructure
*/
transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
data_len, data_dir, task_attr,
&cmd->ft_sense_buffer[0]);
/*
* Check for FCP task management flags
*/
if (fcp->fc_tm_flags) {
ft_send_tm(cmd);
return;
}
fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
ret = transport_get_lun_for_cmd(&cmd->se_cmd, NULL, cmd->lun);
if (ret < 0) {
ft_dump_cmd(cmd, __func__);
transport_send_check_condition_and_sense(&cmd->se_cmd,
cmd->se_cmd.scsi_sense_reason, 0);
return;
}
ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
FT_IO_DBG("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
ft_dump_cmd(cmd, __func__);
if (ret == -1) {
transport_send_check_condition_and_sense(se_cmd,
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
transport_generic_free_cmd(se_cmd, 0, 1, 0);
return;
}
if (ret == -2) {
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
ft_queue_status(se_cmd);
else
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
transport_generic_free_cmd(se_cmd, 0, 1, 0);
return;
}
transport_generic_handle_cdb(se_cmd);
return;
err:
ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID);
return;
}
/*
* Handle Task Management Request.
*/
static void ft_send_tm(struct ft_cmd *cmd)
{
struct se_tmr_req *tmr;
struct fcp_cmnd *fcp;
struct ft_sess *sess;
u8 tm_func;
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
switch (fcp->fc_tm_flags) {
case FCP_TMF_LUN_RESET:
tm_func = TMR_LUN_RESET;
break;
case FCP_TMF_TGT_RESET:
tm_func = TMR_TARGET_WARM_RESET;
break;
case FCP_TMF_CLR_TASK_SET:
tm_func = TMR_CLEAR_TASK_SET;
break;
case FCP_TMF_ABT_TASK_SET:
tm_func = TMR_ABORT_TASK_SET;
break;
case FCP_TMF_CLR_ACA:
tm_func = TMR_CLEAR_ACA;
break;
default:
/*
* FCP4r01 indicates having a combination of
* tm_flags set is invalid.
*/
FT_TM_DBG("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID);
return;
}
FT_TM_DBG("alloc tm cmd fn %d\n", tm_func);
tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func);
if (!tmr) {
FT_TM_DBG("alloc failed\n");
ft_send_resp_code(cmd, FCP_TMF_FAILED);
return;
}
cmd->se_cmd.se_tmr_req = tmr;
switch (fcp->fc_tm_flags) {
case FCP_TMF_LUN_RESET:
cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
if (transport_get_lun_for_tmr(&cmd->se_cmd, cmd->lun) < 0) {
/*
* Make sure to clean up newly allocated TMR request
* since "unable to handle TMR request because failed
* to get to LUN"
*/
FT_TM_DBG("Failed to get LUN for TMR func %d, "
"se_cmd %p, unpacked_lun %d\n",
tm_func, &cmd->se_cmd, cmd->lun);
ft_dump_cmd(cmd, __func__);
sess = cmd->sess;
transport_send_check_condition_and_sense(&cmd->se_cmd,
cmd->se_cmd.scsi_sense_reason, 0);
transport_generic_free_cmd(&cmd->se_cmd, 0, 1, 0);
ft_sess_put(sess);
return;
}
break;
case FCP_TMF_TGT_RESET:
case FCP_TMF_CLR_TASK_SET:
case FCP_TMF_ABT_TASK_SET:
case FCP_TMF_CLR_ACA:
break;
default:
return;
}
transport_generic_handle_tmr(&cmd->se_cmd);
}
/**
* zfcp_unit_enqueue - enqueue unit to unit list of a port.
* @port: pointer to port where unit is added
* @fcp_lun: FCP LUN of unit to be enqueued
* Returns: pointer to enqueued unit on success, ERR_PTR on error
* Locks: config_sema must be held to serialize changes to the unit list
*
* Sets up some unit internal structures and creates sysfs entry.
*/
struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
{
struct zfcp_unit *unit;
unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
if (!unit)
return ERR_PTR(-ENOMEM);
atomic_set(&unit->refcount, 0);
init_waitqueue_head(&unit->remove_wq);
unit->port = port;
unit->fcp_lun = fcp_lun;
snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
unit->sysfs_device.parent = &port->sysfs_device;
unit->sysfs_device.release = zfcp_sysfs_unit_release;
dev_set_drvdata(&unit->sysfs_device, unit);
/* mark unit unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
spin_lock_init(&unit->latencies.lock);
unit->latencies.write.channel.min = 0xFFFFFFFF;
unit->latencies.write.fabric.min = 0xFFFFFFFF;
unit->latencies.read.channel.min = 0xFFFFFFFF;
unit->latencies.read.fabric.min = 0xFFFFFFFF;
unit->latencies.cmd.channel.min = 0xFFFFFFFF;
unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
read_lock_irq(&zfcp_data.config_lock);
if (zfcp_get_unit_by_lun(port, fcp_lun)) {
read_unlock_irq(&zfcp_data.config_lock);
goto err_out_free;
}
read_unlock_irq(&zfcp_data.config_lock);
if (device_register(&unit->sysfs_device))
goto err_out_free;
if (sysfs_create_group(&unit->sysfs_device.kobj,
&zfcp_sysfs_unit_attrs)) {
device_unregister(&unit->sysfs_device);
return ERR_PTR(-EIO);
}
zfcp_unit_get(unit);
unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
write_lock_irq(&zfcp_data.config_lock);
list_add_tail(&unit->list, &port->unit_list_head);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
write_unlock_irq(&zfcp_data.config_lock);
port->units++;
zfcp_port_get(port);
return unit;
err_out_free:
kfree(unit);
return ERR_PTR(-EINVAL);
}
