[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>

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

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 */