[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: NRobert Love <robert.w.love@intel.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/Kconfig

@@ -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

drivers/scsi/Makefile

@@ -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

drivers/scsi/fcoe/Makefile

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

drivers/scsi/fcoe/fc_transport_fcoe.c

+/*
+ * 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;
+}

drivers/scsi/fcoe/fcoe_sw.c

+/*
+ * 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;
+}

include/scsi/fc_transport_fcoe.h

+#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 */

include/scsi/libfcoe.h

+/*
+ * 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 */