+++ /dev/null
-/*
- * 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;
-}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff