path: root/drivers/scsi/fcoe/fcoe_transport.c

/*
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Maintained at www.Open-FCoE.org
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/errno.h>
#include <linux/crc32.h>
#include <scsi/libfcoe.h>

#include "libfcoe.h"

MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FIP discovery protocol and FCoE transport for FCoE HBAs");
MODULE_LICENSE("GPL v2");

static int fcoe_transport_create(const char *, struct kernel_param *);
static int fcoe_transport_destroy(const char *, struct kernel_param *);
static int fcoe_transport_show(char *buffer, const struct kernel_param *kp);
static struct fcoe_transport *fcoe_transport_lookup(struct net_device *device);
static struct fcoe_transport *fcoe_netdev_map_lookup(struct net_device *device);
static int fcoe_transport_enable(const char *, struct kernel_param *);
static int fcoe_transport_disable(const char *, struct kernel_param *);
static int libfcoe_device_notification(struct notifier_block *notifier,
				    ulong event, void *ptr);

static LIST_HEAD(fcoe_transports);
static DEFINE_MUTEX(ft_mutex);
static LIST_HEAD(fcoe_netdevs);
static DEFINE_MUTEX(fn_mutex);

unsigned int libfcoe_debug_logging;
module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");

module_param_call(show, NULL, fcoe_transport_show, NULL, S_IRUSR);
__MODULE_PARM_TYPE(show, "string");
MODULE_PARM_DESC(show, " Show attached FCoE transports");

module_param_call(create, fcoe_transport_create, NULL,
		  (void *)FIP_MODE_FABRIC, S_IWUSR);
__MODULE_PARM_TYPE(create, "string");
MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface");

module_param_call(create_vn2vn, fcoe_transport_create, NULL,
		  (void *)FIP_MODE_VN2VN, S_IWUSR);
__MODULE_PARM_TYPE(create_vn2vn, "string");
MODULE_PARM_DESC(create_vn2vn, " Creates a VN_node to VN_node FCoE instance "
		 "on an Ethernet interface");

module_param_call(destroy, fcoe_transport_destroy, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(destroy, "string");
MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface");

module_param_call(enable, fcoe_transport_enable, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(enable, "string");
MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface.");

module_param_call(disable, fcoe_transport_disable, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(disable, "string");
MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");

/* notification function for packets from net device */
static struct notifier_block libfcoe_notifier = {
	.notifier_call = libfcoe_device_notification,
};

/**
 * fcoe_link_speed_update() - Update the supported and actual link speeds
 * @lport: The local port to update speeds for
 *
 * Returns: 0 if the ethtool query was successful
 *          -1 if the ethtool query failed
 */
int fcoe_link_speed_update(struct fc_lport *lport)
{
	struct net_device *netdev = fcoe_get_netdev(lport);
	struct ethtool_cmd ecmd;

	if (!__ethtool_get_settings(netdev, &ecmd)) {
		lport->link_supported_speeds &=
			~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
		if (ecmd.supported & (SUPPORTED_1000baseT_Half |
				      SUPPORTED_1000baseT_Full))
			lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
		if (ecmd.supported & SUPPORTED_10000baseT_Full)
			lport->link_supported_speeds |=
				FC_PORTSPEED_10GBIT;
		switch (ethtool_cmd_speed(&ecmd)) {
		case SPEED_1000:
			lport->link_speed = FC_PORTSPEED_1GBIT;
			break;
		case SPEED_10000:
			lport->link_speed = FC_PORTSPEED_10GBIT;
			break;
		}
		return 0;
	}
	return -1;
}
EXPORT_SYMBOL_GPL(fcoe_link_speed_update);

/**
 * __fcoe_get_lesb() - Get the Link Error Status Block (LESB) for a given lport
 * @lport: The local port to update speeds for
 * @fc_lesb: Pointer to the LESB to be filled up
 * @netdev: Pointer to the netdev that is associated with the lport
 *
 * Note, the Link Error Status Block (LESB) for FCoE is defined in FC-BB-6
 * Clause 7.11 in v1.04.
 */
void __fcoe_get_lesb(struct fc_lport *lport,
		     struct fc_els_lesb *fc_lesb,
		     struct net_device *netdev)
{
	unsigned int cpu;
	u32 lfc, vlfc, mdac;
	struct fc_stats *stats;
	struct fcoe_fc_els_lesb *lesb;
	struct rtnl_link_stats64 temp;

	lfc = 0;
	vlfc = 0