/*
* zfcp device driver
*
* Interface to Linux SCSI midlayer.
*
* Copyright IBM Corporation 2002, 2009
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <asm/atomic.h>
#include "zfcp_ext.h"
#include "zfcp_dbf.h"
static unsigned int default_depth = 32;
module_param_named(queue_depth, default_depth, uint, 0600);
MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
/* Find start of Sense Information in FCP response unit*/
char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
{
char *fcp_sns_info_ptr;
fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
return fcp_sns_info_ptr;
}
static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
int reason)
{
switch (reason) {
case SCSI_QDEPTH_DEFAULT:
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
break;
case SCSI_QDEPTH_QFULL:
scsi_track_queue_full(sdev, depth);
break;
case SCSI_QDEPTH_RAMP_UP:
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
break;
default:
return -EOPNOTSUPP;
}
return sdev->queue_depth;
}
static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
{
struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
unit->device = NULL;
put_device(&unit->sysfs_device);
}
static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
{
if (sdp->tagged_supported)
scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
else
scsi_adjust_queue_depth(sdp, 0, 1);
return 0;
}
static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
{
struct zfcp_adapter *adapter =
(struct zfcp_adapter *) scpnt->device->host->hostdata[0];
set_host_byte(scpnt, result);
if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL);
/* return directly */
scpnt->scsi_done(scpnt);
}
static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
void (*done) (struct scsi_cmnd *))
{
struct zfcp_unit *unit;
struct zfcp_adapter *adapter;
int status, scsi_result, ret;
struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
/* reset the status for this request */
scpnt->result = 0;
scpnt->host_scribble = NULL;
scpnt->scsi_done = done;
/*
* figure out adapter and target device
* (stored there by zfcp_scsi_slave_alloc)
*/
adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
unit = scpnt->device->hostdata;
BUG_ON(!adapter || (adapter != unit->port->adapter));
BUG_ON(!scpnt->scsi_done);
if (unlikely(!unit)) {
zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
return 0;
}
scsi_result = fc_remote_port_chkready(rport);
if (unlikely(scsi_result)) {
scpnt->result = scsi_result;
zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL);
scpnt->scsi_done(scpnt);
return 0;
}
status = atomic_read(&unit->status);
if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
!(atomic_read(&unit->port->status) &
ZFCP_STATUS_COMMON_ERP_FAILED)) {
/* only unit access denied, but port is good
* not covered by FC transport, have to fail here */
zfcp_scsi_command_fail(scpnt, DID_ERROR);
return 0;
}
if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
/* This could be either
* open unit pending: this is temporary, will result in
* open unit or ERP_FAILED, so retry command
* call to rport_delete pending: mimic retry from
* fc_remote_port_chkready until rport is BLOCKED
*/
zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
return 0;
}
ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
if (unlikely(ret == -EBUSY))
return SCSI_MLQUEUE_DEVICE_BUSY;
else if (unlikely(ret < 0))
return SCSI_MLQUEUE_HOST_BUSY;
return ret;
}
static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
unsigned int id, u64 lun)
{
unsigned long flags;
struct zfcp_port *port;
struct zfcp_unit *unit = NULL;
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list) {
if (!port->rport || (id != port->rport->scsi_target_id))
continue;
unit = zfcp_get_unit_by_lun(port, lun);
if (unit)
break;
}
read_unlock_irqrestore(&adapter->port_list_lock, flags);
return unit;
}
static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
{
struct zfcp_adapter *adapter;
struct zfcp_unit *unit;
u64 lun;
adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
if (!adapter)
goto out;
int_to_scsilun(sdp->lun, (struct scsi_lun *)&lun);
unit = zfcp_unit_lookup(adapter, sdp->id, lun);
if (unit) {
sdp->hostdata = unit;
unit->device = sdp;
return 0;
}
out:
return -ENXIO;
}
static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
{
struct Scsi_Host *scsi_host = scpnt->device->host;
struct zfcp_adapter *adapter =
(struct zfcp_adapter *) scsi_host->hostdata[0];
struct zfcp_unit *unit = scpnt->device->hostdata;
struct zfcp_fsf_req *old_req, *abrt_req;
unsigned long flags;
unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
int retval = SUCCESS;
int retry = 3;
char *dbf_tag;
/* avoid race condition between late normal completion and abort */
write_lock_irqsave(&adapter->abort_lock, flags);
spin_lock(&adapter->req_list_lock);
old_req = zfcp_reqlist_find(adapter, old_reqid);
spin_unlock(&adapter->req_list_lock);
if (!old_req) {
write_unlock_irqrestore(&adapter->abort_lock, flags);
zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
old_reqid);
return FAILED; /* completion could be in progress */
}
old_req->data = NULL;
/* don't access old fsf_req after releasing the abort_lock */
write_unlock_irqrestore(&adapter->abort_lock, flags);
while (retry--) {
abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
if (abrt_req)
break;
zfcp_erp_wait(adapter);
if (!(atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_RUNNING)) {
zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
old_reqid);
return SUCCESS;
}
}
if (!abrt_req)
return FAILED;
wait_for_completion(&abrt_req->completion);
if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
dbf_tag = "okay";
else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
dbf_tag = "lte2";
else {
dbf_tag = "fail";
retval = FAILED;
}
zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
zfcp_fsf_req_free(abrt_req);
return retval;
}
static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
{
struct zfcp_unit *unit = scpnt->device->hostdata;
struct zfcp_adapter *adapter = unit->port->adapter;
struct zfcp_fsf_req *fsf_req = NULL;
int retval = SUCCESS;
int retry = 3;
while (retry--) {
fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
if (fsf_req)
break;
zfcp_erp_wait(adapter);
if (!(atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_RUNNING)) {
zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
return SUCCESS;
}
}
if (!fsf_req)
return FAILED;
wait_for_completion(&fsf_req->completion);
if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
retval = FAILED;
} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
zfcp_dbf_scsi_devreset("nsup", tm_flags, unit, scpnt);
retval = FAILED;
} else
zfcp_dbf_scsi_devreset("okay", tm_flags, unit, scpnt);
zfcp_fsf_req_free(fsf_req);
return retval;
}
static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
{
return zfcp_task_mgmt_function(scpnt, FCP_LOGICAL_UNIT_RESET);
}
static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
return zfcp_task_mgmt_function(scpnt, FCP_TARGET_RESET);
}
static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
struct zfcp_unit *unit = scpnt->device->hostdata;
struct zfcp_adapter *adapter = unit->port->adapter;
zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
zfcp_erp_wait(adapter);
return SUCCESS;
}
int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
{
struct ccw_dev_id dev_id;
if (adapter->scsi_host)
return 0;
ccw_device_get_id(adapter->ccw_device, &dev_id);
/* register adapter as SCSI host with mid layer of SCSI stack */
adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
sizeof (struct zfcp_adapter *));
if (!adapter->scsi_host) {
dev_err(&adapter->ccw_device->dev,
"Registering the FCP device with the "
"SCSI stack failed\n");
return -EIO;
}
/* tell the SCSI stack some characteristics of this adapter */
adapter->scsi_host->max_id = 1;
adapter->scsi_host->max_lun = 1;
adapter->scsi_host->max_channel = 0;
adapter->scsi_host->unique_id = dev_id.devno;
adapter->scsi_host->max_cmd_len = 255;
adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
scsi_host_put(adapter->scsi_host);
return -EIO;
}
return 0;
}
void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
{
struct Scsi_Host *shost;
struct zfcp_port *port;
shost = adapter->scsi_host;
if (!shost)
return;
read_lock_irq(&adapter->port_list_lock);
list_for_each_entry(port, &adapter->port_list, list)
port->rport = NULL;
read_unlock_irq(&adapter->port_list_lock);
fc_remove_host(shost);
scsi_remove_host(shost);
scsi_host_put(shost);
adapter->scsi_host = NULL;
return;
}
static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
{
struct fc_host_statistics *fc_stats;
if (!adapter->fc_stats) {
fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
if (!fc_stats)
return NULL;
adapter->fc_stats = fc_stats; /* freed in adapter_release */
}
memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
return adapter->fc_stats;
}
static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
struct fsf_qtcb_bottom_port *data,
struct fsf_qtcb_bottom_port *old)
{
fc_stats->seconds_since_last_reset =
data->seconds_since_last_reset - old->seconds_since_last_reset;
fc_stats->tx_frames = data->tx_frames - old->tx_frames;
fc_stats->tx_words = data->tx_words - old->tx_words;
fc_stats->rx_frames = data->rx_frames - old->rx_frames;
fc_stats->rx_words = data->rx_words - old->rx_words;
fc_stats->lip_count = data->lip - old->lip;
fc_stats->nos_count = data->nos - old->nos;
fc_stats->error_frames = data->error_frames - old->error_frames;
fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
fc_stats->link_failure_count = data->link_failure - old->link_failure;
fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
fc_stats->loss_of_signal_count =
data->loss_of_signal - old->loss_of_signal;
fc_stats->prim_seq_protocol_err_count =
data->psp_error_counts - old->psp_error_counts;
fc_stats->invalid_tx_word_count =
data->invalid_tx_words - old->invalid_tx_words;
fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
fc_stats->fcp_input_requests =
data->input_requests - old->input_requests;
fc_stats->fcp_output_requests =
data->output_requests - old->output_requests;
fc_stats->fcp_control_requests =
data->control_requests - old->control_requests;
fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
}
static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
struct fsf_qtcb_bottom_port *data)
{
fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
fc_stats->tx_frames = data->tx_frames;
fc_stats->tx_words = data->tx_words;
fc_stats->rx_frames = data->rx_frames;
fc_stats->rx_words = data->rx_words;
fc_stats->lip_count = data->lip;
fc_stats->nos_count = data->nos;
fc_stats->error_frames = data->error_frames;
fc_stats->dumped_frames = data->dumped_frames;
fc_stats->link_failure_count = data->link_failure;
fc_stats->loss_of_sync_count = data->loss_of_sync;
fc_stats->loss_of_signal_count = data->loss_of_signal;
fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
fc_stats->invalid_tx_word_count = data->invalid_tx_words;
fc_stats->invalid_crc_count = data->invalid_crcs;
fc_stats->fcp_input_requests = data->input_requests;
fc_stats->fcp_output_requests = data->output_requests;
fc_stats->fcp_control_requests = data->control_requests;
fc_stats->fcp_input_megabytes = data->input_mb;
fc_stats->fcp_output_megabytes = data->output_mb;
}
static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
{
struct zfcp_adapter *adapter;
struct fc_host_statistics *fc_stats;
struct fsf_qtcb_bottom_port *data;
int ret;
adapter = (struct zfcp_adapter *)host->hostdata[0];
fc_stats = zfcp_init_fc_host_stats(adapter);
if (!fc_stats)
return NULL;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return NULL;
ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
if (ret) {
kfree(data);
return NULL;
}
if (adapter->stats_reset &&
((jiffies/HZ - adapter->stats_reset) <
data->seconds_since_last_reset))
zfcp_adjust_fc_host_stats(fc_stats, data,
adapter->stats_reset_data);
else
zfcp_set_fc_host_stats(fc_stats, data);
kfree(data);
return fc_stats;
}
static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
{
struct zfcp_adapter *adapter;
struct fsf_qtcb_bottom_port *data;
int ret;
adapter = (struct zfcp_adapter *)shost->hostdata[0];
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return;
ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
if (ret)
kfree(data);
else {
adapter->stats_reset = jiffies/HZ;
kfree(adapter->stats_reset_data);
adapter->stats_reset_data = data; /* finally freed in
adapter_release */
}
}
static void zfcp_get_host_port_state(struct Scsi_Host *shost)
{
struct zfcp_adapter *adapter =
(struct zfcp_adapter *)shost->hostdata[0];
int status = atomic_read(&adapter->status);
if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
!(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
else
fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
}
static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
rport->dev_loss_tmo = timeout;
}
/**
* zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
* @rport: The FC rport where to teminate I/O
*
* Abort all pending SCSI commands for a port by closing the
* port. Using a reopen avoiding a conflict with a shutdown
* overwriting a reopen.
*/
static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
{
struct zfcp_port *port;
struct Scsi_Host *shost = rport_to_shost(rport);
struct zfcp_adapter *adapter =
(struct zfcp_adapter *)shost->hostdata[0];
port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
if (port) {
zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
put_device(&port->sysfs_device);
}
}
static void zfcp_scsi_rport_register(struct zfcp_port *port)
{
struct fc_rport_identifiers ids;
struct fc_rport *rport;
if (port->rport)
return;
ids.node_name = port->wwnn;
ids.port_name = port->wwpn;
ids.port_id = port->d_id;
ids.roles = FC_RPORT_ROLE_FCP_TARGET;
rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
if (!rport) {
dev_err(&port->adapter->ccw_device->dev,
"Registering port 0x%016Lx failed\n",
(unsigned long long)port->wwpn);
return;
}
rport->maxframe_size = port->maxframe_size;
rport->supported_classes = port->supported_classes;
port->rport = rport;
}
static void zfcp_scsi_rport_block(struct zfcp_port *port)
{
struct fc_rport *rport = port->rport;
if (rport) {
fc_remote_port_delete(rport);
port->rport = NULL;
}
}
void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
{
get_device(&port->sysfs_device);
port->rport_task = RPORT_ADD;
if (!queue_work(port->adapter->work_queue, &port->rport_work))
put_device(&port->sysfs_device);
}
void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
{
get_device(&port->sysfs_device);
port->rport_task = RPORT_DEL;
if (port->rport && queue_work(port->adapter->work_queue,
&port->rport_work))
return;
put_device(&port->sysfs_device);
}
void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
{
unsigned long flags;
struct zfcp_port *port;
read_lock_irqsave(&adapter->port_list_lock, flags);
list_for_each_entry(port, &adapter->port_list, list)
zfcp_scsi_schedule_rport_block(port);
read_unlock_irqrestore(&adapter->port_list_lock, flags);
}
void zfcp_scsi_rport_work(struct work_struct *work)
{
struct zfcp_port *port = container_of(work, struct zfcp_port,
rport_work);
while (port->rport_task) {
if (port->rport_task == RPORT_ADD) {
port->rport_task = RPORT_NONE;
zfcp_scsi_rport_register(port);
} else {
port->rport_task = RPORT_NONE;
zfcp_scsi_rport_block(port);
}
}
put_device(&port->sysfs_device);
}
void zfcp_scsi_scan(struct work_struct *work)
{
struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
scsi_work);
struct fc_rport *rport;
flush_work(&unit->port->rport_work);
rport = unit->port->rport;
if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
scsilun_to_int((struct scsi_lun *)
&unit->fcp_lun), 0);
put_device(&unit->sysfs_device);
}
static int zfcp_execute_fc_job(struct fc_bsg_job *job)
{
switch (job->request->msgcode) {
case FC_BSG_RPT_ELS:
case FC_BSG_HST_ELS_NOLOGIN:
return zfcp_fc_execute_els_fc_job(job);
case FC_BSG_RPT_CT:
case FC_BSG_HST_CT:
return zfcp_fc_execute_ct_fc_job(job);
default:
return -EINVAL;
}
}
struct fc_function_template zfcp_transport_functions = {
.show_starget_port_id = 1,
.show_starget_port_name = 1,
.show_starget_node_name = 1,
.show_rport_supported_classes = 1,
.show_rport_maxframe_size = 1,
.show_rport_dev_loss_tmo = 1,
.show_host_node_name = 1,
.show_host_port_name = 1,
.show_host_permanent_port_name = 1,
.show_host_supported_classes = 1,
.show_host_supported_speeds = 1,
.show_host_maxframe_size = 1,
.show_host_serial_number = 1,
.get_fc_host_stats = zfcp_get_fc_host_stats,
.reset_fc_host_stats = zfcp_reset_fc_host_stats,
.set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
.get_host_port_state = zfcp_get_host_port_state,
.terminate_rport_io = zfcp_scsi_terminate_rport_io,
.show_host_port_state = 1,
.bsg_request = zfcp_execute_fc_job,
/* no functions registered for following dynamic attributes but
directly set by LLDD */
.show_host_port_type = 1,
.show_host_speed = 1,
.show_host_port_id = 1,
.disable_target_scan = 1,
};
struct zfcp_data zfcp_data = {
.scsi_host_template = {
.name = "zfcp",
.module = THIS_MODULE,
.proc_name = "zfcp",
.change_queue_depth = zfcp_scsi_change_queue_depth,
.slave_alloc = zfcp_scsi_slave_alloc,
.slave_configure = zfcp_scsi_slave_configure,
.slave_destroy = zfcp_scsi_slave_destroy,
.queuecommand = zfcp_scsi_queuecommand,
.eh_abort_handler = zfcp_scsi_eh_abort_handler,
.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
.eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
.can_queue = 4096,
.this_id = -1,
.sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
.cmd_per_lun = 1,
.use_clustering = 1,
.sdev_attrs = zfcp_sysfs_sdev_attrs,
.max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8),
.shost_attrs = zfcp_sysfs_shost_attrs,
},
};
