diff options
Diffstat (limited to 'drivers/scsi/fcoe/fc_transport_fcoe.c')
| -rw-r--r-- | drivers/scsi/fcoe/fc_transport_fcoe.c | 443 |
1 files changed, 0 insertions, 443 deletions
diff --git a/drivers/scsi/fcoe/fc_transport_fcoe.c b/drivers/scsi/fcoe/fc_transport_fcoe.c deleted file mode 100644 index 8862758006c0..000000000000 --- a/drivers/scsi/fcoe/fc_transport_fcoe.c +++ /dev/null @@ -1,443 +0,0 @@ -/* - * Copyright(c) 2007 - 2008 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/pci.h> -#include <scsi/libfcoe.h> -#include <scsi/fc_transport_fcoe.h> - -/* internal fcoe transport */ -struct fcoe_transport_internal { - struct fcoe_transport *t; - struct net_device *netdev; - struct list_head list; -}; - -/* fcoe transports list and its lock */ -static LIST_HEAD(fcoe_transports); -static DEFINE_MUTEX(fcoe_transports_lock); - -/** - * fcoe_transport_default() - Returns ptr to the default transport fcoe_sw - */ -struct fcoe_transport *fcoe_transport_default(void) -{ - return &fcoe_sw_transport; -} - -/** - * fcoe_transport_to_pcidev() - get the pci dev from a netdev - * @netdev: the netdev that pci dev will be retrived from - * - * Returns: NULL or the corrsponding pci_dev - */ -struct pci_dev *fcoe_transport_pcidev(const struct net_device *netdev) -{ - if (!netdev->dev.parent) - return NULL; - return to_pci_dev(netdev->dev.parent); -} - -/** - * fcoe_transport_device_lookup() - Lookup a transport - * @netdev: the netdev the transport to be attached to - * - * This will look for existing offload driver, if not found, it falls back to - * the default sw hba (fcoe_sw) as its fcoe transport. - * - * Returns: 0 for success - */ -static struct fcoe_transport_internal * -fcoe_transport_device_lookup(struct fcoe_transport *t, - struct net_device *netdev) -{ - struct fcoe_transport_internal *ti; - - /* assign the transpor to this device */ - mutex_lock(&t->devlock); - list_for_each_entry(ti, &t->devlist, list) { - if (ti->netdev == netdev) { - mutex_unlock(&t->devlock); - return ti; - } - } - mutex_unlock(&t->devlock); - return NULL; -} -/** - * fcoe_transport_device_add() - Assign a transport to a device - * @netdev: the netdev the transport to be attached to - * - * This will look for existing offload driver, if not found, it falls back to - * the default sw hba (fcoe_sw) as its fcoe transport. - * - * Returns: 0 for success - */ -static int fcoe_transport_device_add(struct fcoe_transport *t, - struct net_device *netdev) -{ - struct fcoe_transport_internal *ti; - - ti = fcoe_transport_device_lookup(t, netdev); - if (ti) { - printk(KERN_DEBUG "fcoe_transport_device_add:" - "device %s is already added to transport %s\n", - netdev->name, t->name); - return -EEXIST; - } - /* allocate an internal struct to host the netdev and the list */ - ti = kzalloc(sizeof(*ti), GFP_KERNEL); - if (!ti) - return -ENOMEM; - - ti->t = t; - ti->netdev = netdev; - INIT_LIST_HEAD(&ti->list); - dev_hold(ti->netdev); - - mutex_lock(&t->devlock); - list_add(&ti->list, &t->devlist); - mutex_unlock(&t->devlock); - - printk(KERN_DEBUG "fcoe_transport_device_add:" - "device %s added to transport %s\n", - netdev->name, t->name); - - return 0; -} - -/** - * fcoe_transport_device_remove() - Remove a device from its transport - * @netdev: the netdev the transport to be attached to - * - * This removes the device from the transport so the given transport will - * not manage this device any more - * - * Returns: 0 for success - */ -static int fcoe_transport_device_remove(struct fcoe_transport *t, - struct net_device *netdev) -{ - struct fcoe_transport_internal *ti; - - ti = fcoe_transport_device_lookup(t, netdev); - if (!ti) { - printk(KERN_DEBUG "fcoe_transport_device_remove:" - "device %s is not managed by transport %s\n", - netdev->name, t->name); - return -ENODEV; - } - mutex_lock(&t->devlock); - list_del(&ti->list); - mutex_unlock(&t->devlock); - printk(KERN_DEBUG "fcoe_transport_device_remove:" - "device %s removed from transport %s\n", - netdev->name, t->name); - dev_put(ti->netdev); - kfree(ti); - return 0; -} - -/** - * fcoe_transport_device_remove_all() - Remove all from transport devlist - * - * This removes the device from the transport so the given transport will - * not manage this device any more - * - * Returns: 0 for success - */ -static void fcoe_transport_device_remove_all(struct fcoe_transport *t) -{ - struct fcoe_transport_internal *ti, *tmp; - - mutex_lock(&t->devlock); - list_for_each_entry_safe(ti, tmp, &t->devlist, list) { - list_del(&ti->list); - kfree(ti); - } - mutex_unlock(&t->devlock); -} - -/** - * fcoe_transport_match() - Use the bus device match function to match the hw - * @t: The fcoe transport to check - * @netdev: The netdev to match against - * - * This function is used to check if the given transport wants to manage the - * input netdev. if the transports implements the match function, it will be - * called, o.w. we just compare the pci vendor and device id. - * - * Returns: true for match up - */ -static bool fcoe_transport_match(struct fcoe_transport *t, - struct net_device *netdev) -{ - /* match transport by vendor and device id */ - struct pci_dev *pci; - - pci = fcoe_transport_pcidev(netdev); - - if (pci) { - printk(KERN_DEBUG "fcoe_transport_match:" - "%s:%x:%x -- %s:%x:%x\n", - t->name, t->vendor, t->device, - netdev->name, pci->vendor, pci->device); - - /* if transport supports match */ - if (t->match) - return t->match(netdev); - - /* else just compare the vendor and device id: pci only */ - return (t->vendor == pci->vendor) && (t->device == pci->device); - } - return false; -} - -/** - * fcoe_transport_lookup() - Check if the transport is already registered - * @t: the transport to be looked up - * - * This compares the parent device (pci) vendor and device id - * - * Returns: NULL if not found - * - * TODO: return default sw transport if no other transport is found - */ -static struct fcoe_transport * -fcoe_transport_lookup(struct net_device *netdev) -{ - struct fcoe_transport *t; - - mutex_lock(&fcoe_transports_lock); - list_for_each_entry(t, &fcoe_transports, list) { - if (fcoe_transport_match(t, netdev)) { - mutex_unlock(&fcoe_transports_lock); - return t; - } - } - mutex_unlock(&fcoe_transports_lock); - - printk(KERN_DEBUG "fcoe_transport_lookup:" - "use default transport for %s\n", netdev->name); - return fcoe_transport_default(); -} - -/** - * fcoe_transport_register() - Adds a fcoe transport to the fcoe transports list - * @t: ptr to the fcoe transport to be added - * - * Returns: 0 for success - */ -int fcoe_transport_register(struct fcoe_transport *t) -{ - struct fcoe_transport *tt; - - /* TODO - add fcoe_transport specific initialization here */ - mutex_lock(&fcoe_transports_lock); - list_for_each_entry(tt, &fcoe_transports, list) { - if (tt == t) { - mutex_unlock(&fcoe_transports_lock); - return -EEXIST; - } - } - list_add_tail(&t->list, &fcoe_transports); - mutex_unlock(&fcoe_transports_lock); - - printk(KERN_DEBUG "fcoe_transport_register:%s\n", t->name); - - return 0; -} -EXPORT_SYMBOL_GPL(fcoe_transport_register); - -/** - * fcoe_transport_unregister() - Remove the tranport fro the fcoe transports list - * @t: ptr to the fcoe transport to be removed - * - * Returns: 0 for success - */ -int fcoe_transport_unregister(struct fcoe_transport *t) -{ - struct fcoe_transport *tt, *tmp; - - mutex_lock(&fcoe_transports_lock); - list_for_each_entry_safe(tt, tmp, &fcoe_transports, list) { - if (tt == t) { - list_del(&t->list); - mutex_unlock(&fcoe_transports_lock); - fcoe_transport_device_remove_all(t); - printk(KERN_DEBUG "fcoe_transport_unregister:%s\n", - t->name); - return 0; - } - } - mutex_unlock(&fcoe_transports_lock); - return -ENODEV; -} -EXPORT_SYMBOL_GPL(fcoe_transport_unregister); - -/** - * fcoe_load_transport_driver() - Load an offload driver by alias name - * @netdev: the target net device - * - * Requests for an offload driver module as the fcoe transport, if fails, it - * falls back to use the SW HBA (fcoe_sw) as its transport - * - * TODO - - * 1. supports only PCI device - * 2. needs fix for VLAn and bonding - * 3. pure hw fcoe hba may not have netdev - * - * Returns: 0 for success - */ -int fcoe_load_transport_driver(struct net_device *netdev) -{ - struct pci_dev *pci; - struct device *dev = netdev->dev.parent; - - if (fcoe_transport_lookup(netdev)) { - /* load default transport */ - printk(KERN_DEBUG "fcoe: already loaded transport for %s\n", - netdev->name); - return -EEXIST; - } - - pci = to_pci_dev(dev); - if (dev->bus != &pci_bus_type) { - printk(KERN_DEBUG "fcoe: support noly PCI device\n"); - return -ENODEV; - } - printk(KERN_DEBUG "fcoe: loading driver fcoe-pci-0x%04x-0x%04x\n", - pci->vendor, pci->device); - - return request_module("fcoe-pci-0x%04x-0x%04x", - pci->vendor, pci->device); - -} -EXPORT_SYMBOL_GPL(fcoe_load_transport_driver); - -/** - * fcoe_transport_attach() - Load transport to fcoe - * @netdev: the netdev the transport to be attached to - * - * This will look for existing offload driver, if not found, it falls back to - * the default sw hba (fcoe_sw) as its fcoe transport. - * - * Returns: 0 for success - */ -int fcoe_transport_attach(struct net_device *netdev) -{ - struct fcoe_transport *t; - - /* find the corresponding transport */ - t = fcoe_transport_lookup(netdev); - if (!t) { - printk(KERN_DEBUG "fcoe_transport_attach" - ":no transport for %s:use %s\n", - netdev->name, t->name); - return -ENODEV; - } - /* add to the transport */ - if (fcoe_transport_device_add(t, netdev)) { - printk(KERN_DEBUG "fcoe_transport_attach" - ":failed to add %s to tramsport %s\n", - netdev->name, t->name); - return -EIO; - } - /* transport create function */ - if (t->create) - t->create(netdev); - - printk(KERN_DEBUG "fcoe_transport_attach:transport %s for %s\n", - t->name, netdev->name); - return 0; -} -EXPORT_SYMBOL_GPL(fcoe_transport_attach); - -/** - * fcoe_transport_release() - Unload transport from fcoe - * @netdev: the net device on which fcoe is to be released - * - * Returns: 0 for success - */ -int fcoe_transport_release(struct net_device *netdev) -{ - struct fcoe_transport *t; - - /* find the corresponding transport */ - t = fcoe_transport_lookup(netdev); - if (!t) { - printk(KERN_DEBUG "fcoe_transport_release:" - "no transport for %s:use %s\n", - netdev->name, t->name); - return -ENODEV; - } - /* remove the device from the transport */ - if (fcoe_transport_device_remove(t, netdev)) { - printk(KERN_DEBUG "fcoe_transport_release:" - "failed to add %s to tramsport %s\n", - netdev->name, t->name); - return -EIO; - } - /* transport destroy function */ - if (t->destroy) - t->destroy(netdev); - - printk(KERN_DEBUG "fcoe_transport_release:" - "device %s dettached from transport %s\n", - netdev->name, t->name); - - return 0; -} -EXPORT_SYMBOL_GPL(fcoe_transport_release); - -/** - * fcoe_transport_init() - Initializes fcoe transport layer - * - * This prepares for the fcoe transport layer - * - * Returns: none - */ -int __init fcoe_transport_init(void) -{ - INIT_LIST_HEAD(&fcoe_transports); - mutex_init(&fcoe_transports_lock); - return 0; -} - -/** - * fcoe_transport_exit() - Cleans up the fcoe transport layer - * - * This cleans up the fcoe transport layer. removing any transport on the list, - * note that the transport destroy func is not called here. - * - * Returns: none - */ -int __exit fcoe_transport_exit(void) -{ - struct fcoe_transport *t, *tmp; - - mutex_lock(&fcoe_transports_lock); - list_for_each_entry_safe(t, tmp, &fcoe_transports, list) { - list_del(&t->list); - mutex_unlock(&fcoe_transports_lock); - fcoe_transport_device_remove_all(t); - mutex_lock(&fcoe_transports_lock); - } - mutex_unlock(&fcoe_transports_lock); - return 0; -} |