Exemplo n.º 1
0
static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
	return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
}
Exemplo n.º 2
0
static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
{
	struct zfcp_adapter *adapter = zsdev->port->adapter;
	struct zfcp_scsi_req_filter filter = {
		.tmf_scope = FCP_TMF_TGT_RESET,
		.port_handle = zsdev->port->handle,
	};
	unsigned long flags;

	if (tm_flags == FCP_TMF_LUN_RESET) {
		filter.tmf_scope = FCP_TMF_LUN_RESET;
		filter.lun_handle = zsdev->lun_handle;
	}

	/*
	 * abort_lock secures against other processings - in the abort-function
	 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
	 */
	write_lock_irqsave(&adapter->abort_lock, flags);
	zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
				   &filter);
	write_unlock_irqrestore(&adapter->abort_lock, flags);
}

static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
	struct zfcp_fsf_req *fsf_req = NULL;
	int retval = SUCCESS, ret;
	int retry = 3;

	while (retry--) {
		fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
		if (fsf_req)
			break;

		zfcp_erp_wait(adapter);
		ret = fc_block_scsi_eh(scpnt);
		if (ret)
			return ret;

		if (!(atomic_read(&adapter->status) &
		      ZFCP_STATUS_COMMON_RUNNING)) {
			zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
			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", scpnt, tm_flags);
		retval = FAILED;
	} else {
		zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
		zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
	}

	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_TMF_LUN_RESET);
}

static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
	return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
}

static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
	int ret;

	zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
	zfcp_erp_wait(adapter);
	ret = fc_block_scsi_eh(scpnt);
	if (ret)
		return ret;

	return SUCCESS;
}

struct scsi_transport_template *zfcp_scsi_transport_template;

static struct scsi_host_template zfcp_scsi_host_template = {
	.module			 = THIS_MODULE,
	.name			 = "zfcp",
	.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,
	.slave_alloc		 = zfcp_scsi_slave_alloc,
	.slave_configure	 = zfcp_scsi_slave_configure,
	.slave_destroy		 = zfcp_scsi_slave_destroy,
	.change_queue_depth	 = scsi_change_queue_depth,
	.proc_name		 = "zfcp",
	.can_queue		 = 4096,
	.this_id		 = -1,
	.sg_tablesize		 = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
				     * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
				   /* GCD, adjusted later */
	.max_sectors		 = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
				     * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
				   /* GCD, adjusted later */
	.dma_boundary		 = ZFCP_QDIO_SBALE_LEN - 1,
	.use_clustering		 = 1,
	.shost_attrs		 = zfcp_sysfs_shost_attrs,
	.sdev_attrs		 = zfcp_sysfs_sdev_attrs,
	.track_queue_depth	 = 1,
};

/**
 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
 * @adapter: The zfcp adapter to register with the SCSI midlayer
 */
int zfcp_scsi_adapter_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_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 = 511;
	adapter->scsi_host->max_lun = 0xFFFFFFFF;
	adapter->scsi_host->max_channel = 0;
	adapter->scsi_host->unique_id = dev_id.devno;
	adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
	adapter->scsi_host->transportt = zfcp_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;
}

/**
 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 * @adapter: The zfcp adapter to unregister.
 */
void zfcp_scsi_adapter_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;
}

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;
}