path: root/drivers/scsi/fnic/fnic_main.c

/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/module.h>
#include <linux/mempool.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/if_ether.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_tcq.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>

#include "vnic_dev.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "fnic_io.h"
#include "fnic_fip.h"
#include "fnic.h"

#define PCI_DEVICE_ID_CISCO_FNIC	0x0045

/* Timer to poll notification area for events. Used for MSI interrupts */
#define FNIC_NOTIFY_TIMER_PERIOD	(2 * HZ)

static struct kmem_cache *fnic_sgl_cache[FNIC_SGL_NUM_CACHES];
static struct kmem_cache *fnic_io_req_cache;
LIST_HEAD(fnic_list);
DEFINE_SPINLOCK(fnic_list_lock);

/* Supported devices by fnic module */
static struct pci_device_id fnic_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_CISCO_FNIC) },
	{ 0, }
};

MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR("Abhijeet Joglekar <abjoglek@cisco.com>, "
	      "Joseph R. Eykholt <jeykholt@cisco.com>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, fnic_id_table);

unsigned int fnic_log_level;
module_param(fnic_log_level, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(fnic_log_level, "bit mask of fnic logging levels");

unsigned int fnic_trace_max_pages = 16;
module_param(fnic_trace_max_pages, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(fnic_trace_max_pages, "Total allocated memory pages "
					"for fnic trace buffer");

static struct libfc_function_template fnic_transport_template = {
	.frame_send = fnic_send,
	.lport_set_port_id = fnic_set_port_id,
	.fcp_abort_io = fnic_empty_scsi_cleanup,
	.fcp_cleanup = fnic_empty_scsi_cleanup,
	.exch_mgr_reset = fnic_exch_mgr_reset
};

static int fnic_slave_alloc(struct scsi_device *sdev)
{
	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));

	sdev->tagged_supported = 1;

	if (!rport || fc_remote_port_chkready(rport))
		return -ENXIO;

	scsi_activate_tcq(sdev, FNIC_DFLT_QUEUE_DEPTH);
	return 0;
}

static struct scsi_host_template fnic_host_template = {
	.module = THIS_MODULE,
	.name = DRV_NAME,
	.queuecommand = fnic_queuecommand,
	.eh_abort_handler = fnic_abort_cmd,
	.eh_device_reset_handler = fnic_device_reset,
	.eh_host_reset_handler = fnic_host_reset,
	.slave_alloc = fnic_slave_alloc,
	.change_queue_depth = fc_change_queue_depth,
	.change_queue_type = fc_change_queue_type,
	.this_id = -1,
	.cmd_per_lun = 3,
	.can_queue = FNIC_MAX_IO_REQ,
	.use_clustering = ENABLE_CLUSTERING,
	.sg_tablesize = FNIC_MAX_SG_DESC_CNT,
	.max_sectors = 0xffff,
	.shost_attrs = fnic_attrs,
};

static void
fnic_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
	if (timeout)
		rport->dev_loss_tmo = timeout;
	else
		rport->dev_loss_tmo = 1;
}

static void fnic_get_host_speed(struct Scsi_Host *shost);
static struct scsi_transport_template *fnic_fc_transport;
static struct fc_host_statistics *fnic_get_stats(struct Scsi_Host *);

static struct fc_function_template fnic_fc_functions = {

	.show_host_node_name = 1,
	.show_host_port_name = 1,
	.show_host_supported_classes = 1,
	.show_host_supported_fc4s = 1,
	.show_host_active_fc4s = 1,
	.show_host_maxframe_size = 1,
	.show_host_port_id = 1,
	.show_host_supported_speeds = 1,
	.get_host_speed = fnic_get_host_speed,
	.show_host_speed = 1,
	.show_host_port_type = 1,
	.get_host_port_state = fc_get_host_port_state,
	.show_host_port_state = 1,
	.show_host_symbolic_name = 1,
	.show_rport_maxframe_size = 1,
	.show_rport_supported_classes = 1,
	.show_host_fabric_name = 1,
	.show_starget_node_name = 1,
	.show_starget_port_name = 1,
	.show_starget_port_id = 1,
	.show_rport_dev_loss_tmo = 1,
	.set_rport_dev_loss_tmo = fnic_set_rport_dev_loss_tmo,
	.issue_fc_host_lip =