[SCSI] fcoe: Fibre Channel over Ethernet

Encapsulation protocol for running Fibre Channel over Ethernet interfaces.
Creates virtual Fibre Channel host adapters using libfc.

This layer is the LLD to the scsi-ml. It allocates the Scsi_Host, utilizes
libfc for Fibre Channel protocol processing and interacts with netdev to
send/receive Ethernet packets.

Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Robert Love 2008-12-09 15:10:24 -08:00 коммит произвёл James Bottomley
Родитель 42e9a92fe6
Коммит 85b4aa4926
8 изменённых файлов: 2696 добавлений и 0 удалений

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@ -609,6 +609,13 @@ config LIBFC
---help---
Fibre Channel library module
config FCOE
tristate "FCoE module"
depends on SCSI
select LIBFC
---help---
Fibre Channel over Ethernet module
config SCSI_DMX3191D
tristate "DMX3191D SCSI support"
depends on PCI && SCSI

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@ -37,6 +37,7 @@ obj-$(CONFIG_SCSI_SRP_ATTRS) += scsi_transport_srp.o
obj-$(CONFIG_SCSI_DH) += device_handler/
obj-$(CONFIG_LIBFC) += libfc/
obj-$(CONFIG_FCOE) += fcoe/
obj-$(CONFIG_ISCSI_TCP) += libiscsi.o libiscsi_tcp.o iscsi_tcp.o
obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
obj-$(CONFIG_SCSI_A4000T) += 53c700.o a4000t.o

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@ -0,0 +1,8 @@
# $Id: Makefile
obj-$(CONFIG_FCOE) += fcoe.o
fcoe-y := \
libfcoe.o \
fcoe_sw.o \
fc_transport_fcoe.o

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@ -0,0 +1,446 @@
/*
* 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 - find out netdev is managed by the
* transport
* 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 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
* @netdev:
*
* This function is used to check if the givne 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);
mutex_init(&t->devlock);
INIT_LIST_HEAD(&t->devlist);
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;
}

494
drivers/scsi/fcoe/fcoe_sw.c Normal file
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@ -0,0 +1,494 @@
/*
* 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/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include <net/rtnetlink.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/libfc.h>
#include <scsi/libfcoe.h>
#include <scsi/fc_transport_fcoe.h>
#define FCOE_SW_VERSION "0.1"
#define FCOE_SW_NAME "fcoesw"
#define FCOE_SW_VENDOR "Open-FCoE.org"
#define FCOE_MAX_LUN 255
#define FCOE_MAX_FCP_TARGET 256
#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
#define FCOE_MIN_XID 0x0001 /* the min xid supported by fcoe_sw */
#define FCOE_MAX_XID 0x07ef /* the max xid supported by fcoe_sw */
static struct scsi_transport_template *scsi_transport_fcoe_sw;
struct fc_function_template fcoe_sw_transport_function = {
.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 = fc_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,
.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
.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,
.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
.show_rport_dev_loss_tmo = 1,
.get_fc_host_stats = fc_get_host_stats,
.issue_fc_host_lip = fcoe_reset,
.terminate_rport_io = fc_rport_terminate_io,
};
static struct scsi_host_template fcoe_sw_shost_template = {
.module = THIS_MODULE,
.name = "FCoE Driver",
.proc_name = FCOE_SW_NAME,
.queuecommand = fc_queuecommand,
.eh_abort_handler = fc_eh_abort,
.eh_device_reset_handler = fc_eh_device_reset,
.eh_host_reset_handler = fc_eh_host_reset,
.slave_alloc = fc_slave_alloc,
.change_queue_depth = fc_change_queue_depth,
.change_queue_type = fc_change_queue_type,
.this_id = -1,
.cmd_per_lun = 32,
.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
.use_clustering = ENABLE_CLUSTERING,
.sg_tablesize = SG_ALL,
.max_sectors = 0xffff,
};
/*
* fcoe_sw_lport_config - sets up the fc_lport
* @lp: ptr to the fc_lport
* @shost: ptr to the parent scsi host
*
* Returns: 0 for success
*
*/
static int fcoe_sw_lport_config(struct fc_lport *lp)
{
int i = 0;
lp->link_status = 0;
lp->max_retry_count = 3;
lp->e_d_tov = 2 * 1000; /* FC-FS default */
lp->r_a_tov = 2 * 2 * 1000;
lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
/*
* allocate per cpu stats block
*/
for_each_online_cpu(i)
lp->dev_stats[i] = kzalloc(sizeof(struct fcoe_dev_stats),
GFP_KERNEL);
/* lport fc_lport related configuration */
fc_lport_config(lp);
return 0;
}
/*
* fcoe_sw_netdev_config - sets up fcoe_softc for lport and network
* related properties
* @lp : ptr to the fc_lport
* @netdev : ptr to the associated netdevice struct
*
* Must be called after fcoe_sw_lport_config() as it will use lport mutex
*
* Returns : 0 for success
*
*/
static int fcoe_sw_netdev_config(struct fc_lport *lp, struct net_device *netdev)
{
u32 mfs;
u64 wwnn, wwpn;
struct fcoe_softc *fc;
u8 flogi_maddr[ETH_ALEN];
/* Setup lport private data to point to fcoe softc */
fc = lport_priv(lp);
fc->lp = lp;
fc->real_dev = netdev;
fc->phys_dev = netdev;
/* Require support for get_pauseparam ethtool op. */
if (netdev->priv_flags & IFF_802_1Q_VLAN)
fc->phys_dev = vlan_dev_real_dev(netdev);
/* Do not support for bonding device */
if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
(fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
(fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
return -EOPNOTSUPP;
}
/*
* Determine max frame size based on underlying device and optional
* user-configured limit. If the MFS is too low, fcoe_link_ok()
* will return 0, so do this first.
*/
mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
sizeof(struct fcoe_crc_eof));
if (fc_set_mfs(lp, mfs))
return -EINVAL;
lp->link_status = ~FC_PAUSE & ~FC_LINK_UP;
if (!fcoe_link_ok(lp))
lp->link_status |= FC_LINK_UP;
/* offload features support */
if (fc->real_dev->features & NETIF_F_SG)
lp->sg_supp = 1;
skb_queue_head_init(&fc->fcoe_pending_queue);
/* setup Source Mac Address */
memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr,
fc->real_dev->addr_len);
wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
fc_set_wwnn(lp, wwnn);
/* XXX - 3rd arg needs to be vlan id */
wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
fc_set_wwpn(lp, wwpn);
/*
* Add FCoE MAC address as second unicast MAC address
* or enter promiscuous mode if not capable of listening
* for multiple unicast MACs.
*/
rtnl_lock();
memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN);
rtnl_unlock();
/*
* setup the receive function from ethernet driver
* on the ethertype for the given device
*/
fc->fcoe_packet_type.func = fcoe_rcv;
fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
fc->fcoe_packet_type.dev = fc->real_dev;
dev_add_pack(&fc->fcoe_packet_type);
return 0;
}
/*
* fcoe_sw_shost_config - sets up fc_lport->host
* @lp : ptr to the fc_lport
* @shost : ptr to the associated scsi host
* @dev : device associated to scsi host
*
* Must be called after fcoe_sw_lport_config) and fcoe_sw_netdev_config()
*
* Returns : 0 for success
*
*/
static int fcoe_sw_shost_config(struct fc_lport *lp, struct Scsi_Host *shost,
struct device *dev)
{
int rc = 0;
/* lport scsi host config */
lp->host = shost;
lp->host->max_lun = FCOE_MAX_LUN;
lp->host->max_id = FCOE_MAX_FCP_TARGET;
lp->host->max_channel = 0;
lp->host->transportt = scsi_transport_fcoe_sw;
/* add the new host to the SCSI-ml */
rc = scsi_add_host(lp->host, dev);
if (rc) {
FC_DBG("fcoe_sw_shost_config:error on scsi_add_host\n");
return rc;
}
sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
FCOE_SW_NAME, FCOE_SW_VERSION,
fcoe_netdev(lp)->name);
return 0;
}
/*
* fcoe_sw_em_config - allocates em for this lport
* @lp: the port that em is to allocated for
*
* Returns : 0 on success
*/
static inline int fcoe_sw_em_config(struct fc_lport *lp)
{
BUG_ON(lp->emp);
lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3,
FCOE_MIN_XID, FCOE_MAX_XID);
if (!lp->emp)
return -ENOMEM;
return 0;
}
/*
* fcoe_sw_destroy - FCoE software HBA tear-down function
* @netdev: ptr to the associated net_device
*
* Returns: 0 if link is OK for use by FCoE.
*/
static int fcoe_sw_destroy(struct net_device *netdev)
{
int cpu;
struct fc_lport *lp = NULL;
struct fcoe_softc *fc;
u8 flogi_maddr[ETH_ALEN];
BUG_ON(!netdev);
printk(KERN_DEBUG "fcoe_sw_destroy:interface on %s\n",
netdev->name);
lp = fcoe_hostlist_lookup(netdev);
if (!lp)
return -ENODEV;
fc = fcoe_softc(lp);
/* Logout of the fabric */
fc_fabric_logoff(lp);
/* Remove the instance from fcoe's list */
fcoe_hostlist_remove(lp);
/* Don't listen for Ethernet packets anymore */
dev_remove_pack(&fc->fcoe_packet_type);
/* Cleanup the fc_lport */
fc_lport_destroy(lp);
fc_fcp_destroy(lp);
/* Detach from the scsi-ml */
fc_remove_host(lp->host);
scsi_remove_host(lp->host);
/* There are no more rports or I/O, free the EM */
if (lp->emp)
fc_exch_mgr_free(lp->emp);
/* Delete secondary MAC addresses */
rtnl_lock();
memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN);
if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN);
rtnl_unlock();
/* Free the per-CPU revieve threads */
fcoe_percpu_clean(lp);
/* Free existing skbs */
fcoe_clean_pending_queue(lp);
/* Free memory used by statistical counters */
for_each_online_cpu(cpu)
kfree(lp->dev_stats[cpu]);
/* Release the net_device and Scsi_Host */
dev_put(fc->real_dev);
scsi_host_put(lp->host);
return 0;
}
static struct libfc_function_template fcoe_sw_libfc_fcn_templ = {
.frame_send = fcoe_xmit,
};
/*
* fcoe_sw_create - this function creates the fcoe interface
* @netdev: pointer the associated netdevice
*
* Creates fc_lport struct and scsi_host for lport, configures lport
* and starts fabric login.
*
* Returns : 0 on success
*/
static int fcoe_sw_create(struct net_device *netdev)
{
int rc;
struct fc_lport *lp = NULL;
struct fcoe_softc *fc;
struct Scsi_Host *shost;
BUG_ON(!netdev);
printk(KERN_DEBUG "fcoe_sw_create:interface on %s\n",
netdev->name);
lp = fcoe_hostlist_lookup(netdev);
if (lp)
return -EEXIST;
shost = fcoe_host_alloc(&fcoe_sw_shost_template,
sizeof(struct fcoe_softc));
if (!shost) {
FC_DBG("Could not allocate host structure\n");
return -ENOMEM;
}
lp = shost_priv(shost);
fc = lport_priv(lp);
/* configure fc_lport, e.g., em */
rc = fcoe_sw_lport_config(lp);
if (rc) {
FC_DBG("Could not configure lport\n");
goto out_host_put;
}
/* configure lport network properties */
rc = fcoe_sw_netdev_config(lp, netdev);
if (rc) {
FC_DBG("Could not configure netdev for lport\n");
goto out_host_put;
}
/* configure lport scsi host properties */
rc = fcoe_sw_shost_config(lp, shost, &netdev->dev);
if (rc) {
FC_DBG("Could not configure shost for lport\n");
goto out_host_put;
}
/* lport exch manager allocation */
rc = fcoe_sw_em_config(lp);
if (rc) {
FC_DBG("Could not configure em for lport\n");
goto out_host_put;
}
/* Initialize the library */
rc = fcoe_libfc_config(lp, &fcoe_sw_libfc_fcn_templ);
if (rc) {
FC_DBG("Could not configure libfc for lport!\n");
goto out_lp_destroy;
}
/* add to lports list */
fcoe_hostlist_add(lp);
lp->boot_time = jiffies;
fc_fabric_login(lp);
dev_hold(netdev);
return rc;
out_lp_destroy:
fc_exch_mgr_free(lp->emp); /* Free the EM */
out_host_put:
scsi_host_put(lp->host);
return rc;
}
/*
* fcoe_sw_match - the fcoe sw transport match function
*
* Returns : false always
*/
static bool fcoe_sw_match(struct net_device *netdev)
{
/* FIXME - for sw transport, always return false */
return false;
}
/* the sw hba fcoe transport */
struct fcoe_transport fcoe_sw_transport = {
.name = "fcoesw",
.create = fcoe_sw_create,
.destroy = fcoe_sw_destroy,
.match = fcoe_sw_match,
.vendor = 0x0,
.device = 0xffff,
};
/*
* fcoe_sw_init - registers fcoe_sw_transport
*
* Returns : 0 on success
*/
int __init fcoe_sw_init(void)
{
/* attach to scsi transport */
scsi_transport_fcoe_sw =
fc_attach_transport(&fcoe_sw_transport_function);
if (!scsi_transport_fcoe_sw) {
printk(KERN_ERR "fcoe_sw_init:fc_attach_transport() failed\n");
return -ENODEV;
}
/* register sw transport */
fcoe_transport_register(&fcoe_sw_transport);
return 0;
}
/*
* fcoe_sw_exit - unregisters fcoe_sw_transport
*
* Returns : 0 on success
*/
int __exit fcoe_sw_exit(void)
{
/* dettach the transport */
fc_release_transport(scsi_transport_fcoe_sw);
fcoe_transport_unregister(&fcoe_sw_transport);
return 0;
}

1510
drivers/scsi/fcoe/libfcoe.c Normal file

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#ifndef FC_TRANSPORT_FCOE_H
#define FC_TRANSPORT_FCOE_H
#include <linux/device.h>
#include <linux/netdevice.h>
#include <scsi/scsi_host.h>
#include <scsi/libfc.h>
/**
* struct fcoe_transport - FCoE transport struct for generic transport
* for Ethernet devices as well as pure HBAs
*
* @name: name for thsi transport
* @bus: physical bus type (pci_bus_type)
* @driver: physical bus driver for network device
* @create: entry create function
* @destroy: exit destroy function
* @list: list of transports
*/
struct fcoe_transport {
char *name;
unsigned short vendor;
unsigned short device;
struct bus_type *bus;
struct device_driver *driver;
int (*create)(struct net_device *device);
int (*destroy)(struct net_device *device);
bool (*match)(struct net_device *device);
struct list_head list;
struct list_head devlist;
struct mutex devlock;
};
/**
* MODULE_ALIAS_FCOE_PCI
*
* some care must be taken with this, vendor and device MUST be a hex value
* preceded with 0x and with letters in lower case (0x12ab, not 0x12AB or 12AB)
*/
#define MODULE_ALIAS_FCOE_PCI(vendor, device) \
MODULE_ALIAS("fcoe-pci-" __stringify(vendor) "-" __stringify(device))
/* exported funcs */
int fcoe_transport_attach(struct net_device *netdev);
int fcoe_transport_release(struct net_device *netdev);
int fcoe_transport_register(struct fcoe_transport *t);
int fcoe_transport_unregister(struct fcoe_transport *t);
int fcoe_load_transport_driver(struct net_device *netdev);
int __init fcoe_transport_init(void);
int __exit fcoe_transport_exit(void);
/* fcow_sw is the default transport */
extern struct fcoe_transport fcoe_sw_transport;
#endif /* FC_TRANSPORT_FCOE_H */

176
include/scsi/libfcoe.h Normal file
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/*
* 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
*/
#ifndef _LIBFCOE_H
#define _LIBFCOE_H
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
/*
* this percpu struct for fcoe
*/
struct fcoe_percpu_s {
int cpu;
struct task_struct *thread;
struct sk_buff_head fcoe_rx_list;
struct page *crc_eof_page;
int crc_eof_offset;
};
/*
* the fcoe sw transport private data
*/
struct fcoe_softc {
struct list_head list;
struct fc_lport *lp;
struct net_device *real_dev;
struct net_device *phys_dev; /* device with ethtool_ops */
struct packet_type fcoe_packet_type;
struct sk_buff_head fcoe_pending_queue;
u8 dest_addr[ETH_ALEN];
u8 ctl_src_addr[ETH_ALEN];
u8 data_src_addr[ETH_ALEN];
/*
* fcoe protocol address learning related stuff
*/
u16 flogi_oxid;
u8 flogi_progress;
u8 address_mode;
};
static inline struct fcoe_softc *fcoe_softc(
const struct fc_lport *lp)
{
return (struct fcoe_softc *)lport_priv(lp);
}
static inline struct net_device *fcoe_netdev(
const struct fc_lport *lp)
{
return fcoe_softc(lp)->real_dev;
}
static inline struct fcoe_hdr *skb_fcoe_header(const struct sk_buff *skb)
{
return (struct fcoe_hdr *)skb_network_header(skb);
}
static inline int skb_fcoe_offset(const struct sk_buff *skb)
{
return skb_network_offset(skb);
}
static inline struct fc_frame_header *skb_fc_header(const struct sk_buff *skb)
{
return (struct fc_frame_header *)skb_transport_header(skb);
}
static inline int skb_fc_offset(const struct sk_buff *skb)
{
return skb_transport_offset(skb);
}
static inline void skb_reset_fc_header(struct sk_buff *skb)
{
skb_reset_network_header(skb);
skb_set_transport_header(skb, skb_network_offset(skb) +
sizeof(struct fcoe_hdr));
}
static inline bool skb_fc_is_data(const struct sk_buff *skb)
{
return skb_fc_header(skb)->fh_r_ctl == FC_RCTL_DD_SOL_DATA;
}
static inline bool skb_fc_is_cmd(const struct sk_buff *skb)
{
return skb_fc_header(skb)->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD;
}
static inline bool skb_fc_has_exthdr(const struct sk_buff *skb)
{
return (skb_fc_header(skb)->fh_r_ctl == FC_RCTL_VFTH) ||
(skb_fc_header(skb)->fh_r_ctl == FC_RCTL_IFRH) ||
(skb_fc_header(skb)->fh_r_ctl == FC_RCTL_ENCH);
}
static inline bool skb_fc_is_roff(const struct sk_buff *skb)
{
return skb_fc_header(skb)->fh_f_ctl[2] & FC_FC_REL_OFF;
}
static inline u16 skb_fc_oxid(const struct sk_buff *skb)
{
return be16_to_cpu(skb_fc_header(skb)->fh_ox_id);
}
static inline u16 skb_fc_rxid(const struct sk_buff *skb)
{
return be16_to_cpu(skb_fc_header(skb)->fh_rx_id);
}
/* FIXME - DMA_BIDIRECTIONAL ? */
#define skb_cb(skb) ((struct fcoe_rcv_info *)&((skb)->cb[0]))
#define skb_cmd(skb) (skb_cb(skb)->fr_cmd)
#define skb_dir(skb) (skb_cmd(skb)->sc_data_direction)
static inline bool skb_fc_is_read(const struct sk_buff *skb)
{
if (skb_fc_is_cmd(skb) && skb_cmd(skb))
return skb_dir(skb) == DMA_FROM_DEVICE;
return false;
}
static inline bool skb_fc_is_write(const struct sk_buff *skb)
{
if (skb_fc_is_cmd(skb) && skb_cmd(skb))
return skb_dir(skb) == DMA_TO_DEVICE;
return false;
}
/* libfcoe funcs */
int fcoe_reset(struct Scsi_Host *shost);
u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
unsigned int scheme, unsigned int port);
u32 fcoe_fc_crc(struct fc_frame *fp);
int fcoe_xmit(struct fc_lport *, struct fc_frame *);
int fcoe_rcv(struct sk_buff *, struct net_device *,
struct packet_type *, struct net_device *);
int fcoe_percpu_receive_thread(void *arg);
void fcoe_clean_pending_queue(struct fc_lport *lp);
void fcoe_percpu_clean(struct fc_lport *lp);
void fcoe_watchdog(ulong vp);
int fcoe_link_ok(struct fc_lport *lp);
struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
int fcoe_hostlist_add(const struct fc_lport *);
int fcoe_hostlist_remove(const struct fc_lport *);
struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *, int);
int fcoe_libfc_config(struct fc_lport *, struct libfc_function_template *);
/* fcoe sw hba */
int __init fcoe_sw_init(void);
int __exit fcoe_sw_exit(void);
#endif /* _LIBFCOE_H */