zfcp_fsf.c

linux-2.6.15.6

}

static int
zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *fsf_req)
{
	struct fsf_status_read_buffer *status_buffer;
	struct zfcp_adapter *adapter;
	struct zfcp_port *port;
	unsigned long flags;

	status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
	adapter = fsf_req->adapter;

	read_lock_irqsave(&zfcp_data.config_lock, flags);
	list_for_each_entry(port, &adapter->port_list_head, list)
	    if (port->d_id == (status_buffer->d_id & ZFCP_DID_MASK))
		break;
	read_unlock_irqrestore(&zfcp_data.config_lock, flags);

	if (!port || (port->d_id != (status_buffer->d_id & ZFCP_DID_MASK))) {
		ZFCP_LOG_NORMAL("bug: Reopen port indication received for"
				"nonexisting port with d_id 0x%08x on "
				"adapter %s. Ignored.\n",
				status_buffer->d_id & ZFCP_DID_MASK,
				zfcp_get_busid_by_adapter(adapter));
		goto out;
	}

	switch (status_buffer->status_subtype) {

	case FSF_STATUS_READ_SUB_CLOSE_PHYS_PORT:
		debug_text_event(adapter->erp_dbf, 3, "unsol_pc_phys:");
		zfcp_erp_port_reopen(port, 0);
		break;

	case FSF_STATUS_READ_SUB_ERROR_PORT:
		debug_text_event(adapter->erp_dbf, 1, "unsol_pc_err:");
		zfcp_erp_port_shutdown(port, 0);
		break;

	default:
		debug_text_event(adapter->erp_dbf, 0, "unsol_unk_sub:");
		debug_exception(adapter->erp_dbf, 0,
				&status_buffer->status_subtype, sizeof (u32));
		ZFCP_LOG_NORMAL("bug: Undefined status subtype received "
				"for a reopen indication on port with "
				"d_id 0x%08x on the adapter %s. "
				"Ignored. (debug info 0x%x)\n",
				status_buffer->d_id,
				zfcp_get_busid_by_adapter(adapter),
				status_buffer->status_subtype);
	}
 out:
	return 0;
}

/*
 * function:    zfcp_fsf_status_read_handler
 *
 * purpose:	is called for finished Open Port command
 *
 * returns:	
 */
static int
zfcp_fsf_status_read_handler(struct zfcp_fsf_req *fsf_req)
{
	int retval = 0;
	struct zfcp_adapter *adapter = fsf_req->adapter;
	struct fsf_status_read_buffer *status_buffer =
		(struct fsf_status_read_buffer *) fsf_req->data;

	if (fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
		zfcp_hba_dbf_event_fsf_unsol("dism", adapter, status_buffer);
		mempool_free(status_buffer, adapter->pool.data_status_read);
		zfcp_fsf_req_free(fsf_req);
		goto out;
	}

	zfcp_hba_dbf_event_fsf_unsol("read", adapter, status_buffer);

	switch (status_buffer->status_type) {

	case FSF_STATUS_READ_PORT_CLOSED:
		zfcp_fsf_status_read_port_closed(fsf_req);
		break;

	case FSF_STATUS_READ_INCOMING_ELS:
		zfcp_fsf_incoming_els(fsf_req);
		break;

	case FSF_STATUS_READ_SENSE_DATA_AVAIL:
		ZFCP_LOG_INFO("unsolicited sense data received (adapter %s)\n",
			      zfcp_get_busid_by_adapter(adapter));
		break;

	case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
		ZFCP_LOG_NORMAL("Bit error threshold data received:\n");
		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
			      (char *) status_buffer,
			      sizeof (struct fsf_status_read_buffer));
		break;

	case FSF_STATUS_READ_LINK_DOWN:
		switch (status_buffer->status_subtype) {
		case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
			ZFCP_LOG_INFO("Physical link to adapter %s is down\n",
				      zfcp_get_busid_by_adapter(adapter));
			zfcp_fsf_link_down_info_eval(adapter,
				(struct fsf_link_down_info *)
				&status_buffer->payload);
			break;
		case FSF_STATUS_READ_SUB_FDISC_FAILED:
			ZFCP_LOG_INFO("Local link to adapter %s is down "
				      "due to failed FDISC login\n",
				      zfcp_get_busid_by_adapter(adapter));
			zfcp_fsf_link_down_info_eval(adapter,
				(struct fsf_link_down_info *)
				&status_buffer->payload);
			break;
		case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
			ZFCP_LOG_INFO("Local link to adapter %s is down "
				      "due to firmware update on adapter\n",
				      zfcp_get_busid_by_adapter(adapter));
			zfcp_fsf_link_down_info_eval(adapter, NULL);
			break;
		default:
			ZFCP_LOG_INFO("Local link to adapter %s is down "
				      "due to unknown reason\n",
				      zfcp_get_busid_by_adapter(adapter));
			zfcp_fsf_link_down_info_eval(adapter, NULL);
		};
		break;

	case FSF_STATUS_READ_LINK_UP:
		ZFCP_LOG_NORMAL("Local link to adapter %s was replugged. "
				"Restarting operations on this adapter\n",
				zfcp_get_busid_by_adapter(adapter));
		/* All ports should be marked as ready to run again */
		zfcp_erp_modify_adapter_status(adapter,
					       ZFCP_STATUS_COMMON_RUNNING,
					       ZFCP_SET);
		zfcp_erp_adapter_reopen(adapter,
					ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED
					| ZFCP_STATUS_COMMON_ERP_FAILED);
		break;

	case FSF_STATUS_READ_CFDC_UPDATED:
		ZFCP_LOG_NORMAL("CFDC has been updated on the adapter %s\n",
			      zfcp_get_busid_by_adapter(adapter));
		zfcp_erp_adapter_access_changed(adapter);
		break;

	case FSF_STATUS_READ_CFDC_HARDENED:
		switch (status_buffer->status_subtype) {
		case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE:
			ZFCP_LOG_NORMAL("CFDC of adapter %s saved on SE\n",
				      zfcp_get_busid_by_adapter(adapter));
			break;
		case FSF_STATUS_READ_SUB_CFDC_HARDENED_ON_SE2:
			ZFCP_LOG_NORMAL("CFDC of adapter %s has been copied "
				      "to the secondary SE\n",
				zfcp_get_busid_by_adapter(adapter));
			break;
		default:
			ZFCP_LOG_NORMAL("CFDC of adapter %s has been hardened\n",
				      zfcp_get_busid_by_adapter(adapter));
		}
		break;

	case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
		debug_text_event(adapter->erp_dbf, 2, "unsol_features:");
		ZFCP_LOG_INFO("List of supported features on adapter %s has "
			      "been changed from 0x%08X to 0x%08X\n",
			      zfcp_get_busid_by_adapter(adapter),
			      *(u32*) (status_buffer->payload + 4),
			      *(u32*) (status_buffer->payload));
		adapter->adapter_features = *(u32*) status_buffer->payload;
		break;

	default:
		ZFCP_LOG_NORMAL("warning: An unsolicited status packet of unknown "
				"type was received (debug info 0x%x)\n",
				status_buffer->status_type);
		ZFCP_LOG_DEBUG("Dump of status_read_buffer %p:\n",
			       status_buffer);
		ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
			      (char *) status_buffer,
			      sizeof (struct fsf_status_read_buffer));
		break;
	}
	mempool_free(status_buffer, adapter->pool.data_status_read);
	zfcp_fsf_req_free(fsf_req);
	/*
	 * recycle buffer and start new request repeat until outbound
	 * queue is empty or adapter shutdown is requested
	 */
	/*
	 * FIXME(qdio):
	 * we may wait in the req_create for 5s during shutdown, so
	 * qdio_cleanup will have to wait at least that long before returning
	 * with failure to allow us a proper cleanup under all circumstances
	 */
	/*
	 * FIXME:
	 * allocation failure possible? (Is this code needed?)
	 */
	retval = zfcp_fsf_status_read(adapter, 0);
	if (retval < 0) {
		ZFCP_LOG_INFO("Failed to create unsolicited status read "
			      "request for the adapter %s.\n",
			      zfcp_get_busid_by_adapter(adapter));
		/* temporary fix to avoid status read buffer shortage */
		adapter->status_read_failed++;
		if ((ZFCP_STATUS_READS_RECOM - adapter->status_read_failed)
		    < ZFCP_STATUS_READ_FAILED_THRESHOLD) {
			ZFCP_LOG_INFO("restart adapter %s due to status read "
				      "buffer shortage\n",
				      zfcp_get_busid_by_adapter(adapter));
			zfcp_erp_adapter_reopen(adapter, 0);
		}
	}
 out:
	return retval;
}

/*
 * function:    zfcp_fsf_abort_fcp_command
 *
 * purpose:	tells FSF to abort a running SCSI command
 *
 * returns:	address of initiated FSF request
 *		NULL - request could not be initiated
 *
 * FIXME(design): should be watched by a timeout !!! 
 * FIXME(design) shouldn't this be modified to return an int
 *               also...don't know how though
 */
struct zfcp_fsf_req *
zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
			   struct zfcp_adapter *adapter,
			   struct zfcp_unit *unit, int req_flags)
{
	volatile struct qdio_buffer_element *sbale;
	unsigned long lock_flags;
	struct zfcp_fsf_req *fsf_req = NULL;
	int retval = 0;

	/* setup new FSF request */
	retval = zfcp_fsf_req_create(adapter, FSF_QTCB_ABORT_FCP_CMND,
				     req_flags, adapter->pool.fsf_req_abort,
				     &lock_flags, &fsf_req);
	if (retval < 0) {
		ZFCP_LOG_INFO("error: Failed to create an abort command "
			      "request for lun 0x%016Lx on port 0x%016Lx "
			      "on adapter %s.\n",
			      unit->fcp_lun,
			      unit->port->wwpn,
			      zfcp_get_busid_by_adapter(adapter));
		goto out;
	}

	sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
        sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
        sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;

	fsf_req->data = (unsigned long) unit;

	/* set handles of unit and its parent port in QTCB */
	fsf_req->qtcb->header.lun_handle = unit->handle;
	fsf_req->qtcb->header.port_handle = unit->port->handle;

	/* set handle of request which should be aborted */
	fsf_req->qtcb->bottom.support.req_handle = (u64) old_req_id;

	/* start QDIO request for this FSF request */

	zfcp_fsf_start_scsi_er_timer(adapter);
	retval = zfcp_fsf_req_send(fsf_req, NULL);
	if (retval) {
		del_timer(&adapter->scsi_er_timer);
		ZFCP_LOG_INFO("error: Failed to send abort command request "
			      "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
			      zfcp_get_busid_by_adapter(adapter),
			      unit->port->wwpn, unit->fcp_lun);
		zfcp_fsf_req_free(fsf_req);
		fsf_req = NULL;
		goto out;
	}

	ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
		       "(adapter%s, port d_id=0x%08x, "
		       "unit x%016Lx, old_req_id=0x%lx)\n",
		       zfcp_get_busid_by_adapter(adapter),
		       unit->port->d_id,
		       unit->fcp_lun, old_req_id);
 out:
	write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
	return fsf_req;
}

/*
 * function:    zfcp_fsf_abort_fcp_command_handler
 *
 * purpose:	is called for finished Abort FCP Command request
 *
 * returns:	
 */
static int
zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *new_fsf_req)
{
	int retval = -EINVAL;
	struct zfcp_unit *unit;
	unsigned char status_qual =
	    new_fsf_req->qtcb->header.fsf_status_qual.word[0];

	del_timer(&new_fsf_req->adapter->scsi_er_timer);

	if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR) {
		/* do not set ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED */
		goto skip_fsfstatus;
	}

	unit = (struct zfcp_unit *) new_fsf_req->data;

	/* evaluate FSF status in QTCB */
	switch (new_fsf_req->qtcb->header.fsf_status) {

	case FSF_PORT_HANDLE_NOT_VALID:
		if (status_qual >> 4 != status_qual % 0xf) {
			debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
					 "fsf_s_phand_nv0");
			/*
			 * In this case a command that was sent prior to a port
			 * reopen was aborted (handles are different). This is
			 * fine.
			 */
		} else {
			ZFCP_LOG_INFO("Temporary port identifier 0x%x for "
				      "port 0x%016Lx on adapter %s invalid. "
				      "This may happen occasionally.\n",
				      unit->port->handle,
				      unit->port->wwpn,
				      zfcp_get_busid_by_unit(unit));
			ZFCP_LOG_INFO("status qualifier:\n");
			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_INFO,
				      (char *) &new_fsf_req->qtcb->header.
				      fsf_status_qual,
				      sizeof (union fsf_status_qual));
			/* Let's hope this sorts out the mess */
			debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
					 "fsf_s_phand_nv1");
			zfcp_erp_adapter_reopen(unit->port->adapter, 0);
			new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
		}
		break;

	case FSF_LUN_HANDLE_NOT_VALID:
		if (status_qual >> 4 != status_qual % 0xf) {
			/* 2 */
			debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
					 "fsf_s_lhand_nv0");
			/*
			 * In this case a command that was sent prior to a unit
			 * reopen was aborted (handles are different).
			 * This is fine.
			 */
		} else {
			ZFCP_LOG_INFO
			    ("Warning: Temporary LUN identifier 0x%x of LUN "
			     "0x%016Lx on port 0x%016Lx on adapter %s is "
			     "invalid. This may happen in rare cases. "
			     "Trying to re-establish link.\n",
			     unit->handle,
			     unit->fcp_lun,
			     unit->port->wwpn,
			     zfcp_get_busid_by_unit(unit));
			ZFCP_LOG_DEBUG("Status qualifier data:\n");
			ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG,
				      (char *) &new_fsf_req->qtcb->header.
				      fsf_status_qual,
				      sizeof (union fsf_status_qual));
			/* Let's hope this sorts out the mess */
			debug_text_event(new_fsf_req->adapter->erp_dbf, 1,
					 "fsf_s_lhand_nv1");
			zfcp_erp_port_reopen(unit->port, 0);
			new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR;
		}
		break;

	case FSF_FCP_COMMAND_DOES_NOT_EXIST:
		retval = 0;
		debug_text_event(new_fsf_req->adapter->erp_dbf, 3,
				 "fsf_s_no_exist");
		new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
		break;

	case FSF_PORT_BOXED:
		ZFCP_LOG_INFO("Remote port 0x%016Lx on adapter %s needs to "
			      "be reopened\n", unit->port->wwpn,
			      zfcp_get_busid_by_unit(unit));
		debug_text_event(new_fsf_req->adapter->erp_dbf, 2,
				 "fsf_s_pboxed");
		zfcp_erp_port_boxed(unit->port);
		new_fsf_req->status |= ZFCP_STATUS_FSFREQ_ERROR
		    | ZFCP_STATUS_FSFREQ_RETRY;
		break;

	case FSF_LUN_BOXED:
                ZFCP_LOG_INFO(
                        "unit 0x%016Lx on port 0x%016Lx on adapter %s needs "