Commit 97c8389d authored by Joe Eykholt's avatar Joe Eykholt Committed by James Bottomley

[SCSI] fcoe, libfcoe: Add support for FIP. FCoE discovery and keep-alive.

FIP is the new standard way to discover Fibre-Channel Forwarders (FCFs)
by sending solicitations and listening for advertisements from FCFs.

It also provides for keep-alives and period advertisements so that both
parties know they have connectivity.  If the FCF loses connectivity to
the storage fabric, it can send a Link Reset to inform the E_node.

This version is also compatible with pre-FIP implementations, so no
configured selection between FIP mode and non-FIP mode is required.

We wait a couple seconds after sending the initial solicitation
and then send an old-style FLOGI.  If we receive any FIP frames,
we use FIP only mode.  If the old FLOGI receives a response,
we disable FIP mode.  After every reset or link up, this
determination is repeated.
Signed-off-by: default avatarJoe Eykholt <jeykholt@cisco.com>
Signed-off-by: default avatarVasu Dev <vasu.dev@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent af5f4287
This diff is collapsed.
...@@ -26,10 +26,6 @@ ...@@ -26,10 +26,6 @@
#define FCOE_MAX_QUEUE_DEPTH 256 #define FCOE_MAX_QUEUE_DEPTH 256
#define FCOE_LOW_QUEUE_DEPTH 32 #define FCOE_LOW_QUEUE_DEPTH 32
/* destination address mode */
#define FCOE_GW_ADDR_MODE 0x00
#define FCOE_FCOUI_ADDR_MODE 0x01
#define FCOE_WORD_TO_BYTE 4 #define FCOE_WORD_TO_BYTE 4
#define FCOE_VERSION "0.1" #define FCOE_VERSION "0.1"
...@@ -59,24 +55,17 @@ struct fcoe_percpu_s { ...@@ -59,24 +55,17 @@ struct fcoe_percpu_s {
*/ */
struct fcoe_softc { struct fcoe_softc {
struct list_head list; struct list_head list;
struct fc_lport *lp;
struct net_device *real_dev; struct net_device *real_dev;
struct net_device *phys_dev; /* device with ethtool_ops */ struct net_device *phys_dev; /* device with ethtool_ops */
struct packet_type fcoe_packet_type; struct packet_type fcoe_packet_type;
struct packet_type fip_packet_type;
struct sk_buff_head fcoe_pending_queue; struct sk_buff_head fcoe_pending_queue;
u8 fcoe_pending_queue_active; u8 fcoe_pending_queue_active;
struct fcoe_ctlr ctlr;
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;
}; };
#define fcoe_from_ctlr(fc) container_of(fc, struct fcoe_softc, ctlr)
static inline struct net_device *fcoe_netdev( static inline struct net_device *fcoe_netdev(
const struct fc_lport *lp) const struct fc_lport *lp)
{ {
......
This diff is collapsed.
/* /*
* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2007-2008 Intel Corporation. All rights reserved.
* *
* This program is free software; you can redistribute it and/or modify it * This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License, * under the terms and conditions of the GNU General Public License,
...@@ -20,11 +21,142 @@ ...@@ -20,11 +21,142 @@
#ifndef _LIBFCOE_H #ifndef _LIBFCOE_H
#define _LIBFCOE_H #define _LIBFCOE_H
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h> #include <linux/netdevice.h>
#include <linux/skbuff.h> #include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <scsi/fc/fc_fcoe.h> #include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h> #include <scsi/libfc.h>
/*
* FIP tunable parameters.
*/
#define FCOE_CTLR_START_DELAY 2000 /* mS after first adv. to choose FCF */
#define FCOE_CTRL_SOL_TOV 2000 /* min. solicitation interval (mS) */
#define FCOE_CTLR_FCF_LIMIT 20 /* max. number of FCF entries */
/**
* enum fip_state - internal state of FCoE controller.
* @FIP_ST_DISABLED: controller has been disabled or not yet enabled.
* @FIP_ST_LINK_WAIT: the physical link is down or unusable.
* @FIP_ST_AUTO: determining whether to use FIP or non-FIP mode.
* @FIP_ST_NON_FIP: non-FIP mode selected.
* @FIP_ST_ENABLED: FIP mode selected.
*/
enum fip_state {
FIP_ST_DISABLED,
FIP_ST_LINK_WAIT,
FIP_ST_AUTO,
FIP_ST_NON_FIP,
FIP_ST_ENABLED,
};
/**
* struct fcoe_ctlr - FCoE Controller and FIP state.
* @state: internal FIP state for network link and FIP or non-FIP mode.
* @lp: &fc_lport: libfc local port.
* @sel_fcf: currently selected FCF, or NULL.
* @fcfs: list of discovered FCFs.
* @fcf_count: number of discovered FCF entries.
* @sol_time: time when a multicast solicitation was last sent.
* @sel_time: time after which to select an FCF.
* @port_ka_time: time of next port keep-alive.
* @ctlr_ka_time: time of next controller keep-alive.
* @timer: timer struct used for all delayed events.
* @link_work: &work_struct for doing FCF selection.
* @recv_work: &work_struct for receiving FIP frames.
* @fip_recv_list: list of received FIP frames.
* @user_mfs: configured maximum FC frame size, including FC header.
* @flogi_oxid: exchange ID of most recent fabric login.
* @flogi_count: number of FLOGI attempts in AUTO mode.
* @link: current link status for libfc.
* @last_link: last link state reported to libfc.
* @map_dest: use the FC_MAP mode for destination MAC addresses.
* @dest_addr: MAC address of the selected FC forwarder.
* @ctl_src_addr: the native MAC address of our local port.
* @data_src_addr: the assigned MAC address for the local port after FLOGI.
* @send: LLD-supplied function to handle sending of FIP Ethernet frames.
* @update_mac: LLD-supplied function to handle changes to MAC addresses.
* @lock: lock protecting this structure.
*
* This structure is used by all FCoE drivers. It contains information
* needed by all FCoE low-level drivers (LLDs) as well as internal state
* for FIP, and fields shared with the LLDS.
*/
struct fcoe_ctlr {
enum fip_state state;
struct fc_lport *lp;
struct fcoe_fcf *sel_fcf;
struct list_head fcfs;
u16 fcf_count;
unsigned long sol_time;
unsigned long sel_time;
unsigned long port_ka_time;
unsigned long ctlr_ka_time;
struct timer_list timer;
struct work_struct link_work;
struct work_struct recv_work;
struct sk_buff_head fip_recv_list;
u16 user_mfs;
u16 flogi_oxid;
u8 flogi_count;
u8 link;
u8 last_link;
u8 map_dest;
u8 dest_addr[ETH_ALEN];
u8 ctl_src_addr[ETH_ALEN];
u8 data_src_addr[ETH_ALEN];
void (*send)(struct fcoe_ctlr *, struct sk_buff *);
void (*update_mac)(struct fcoe_ctlr *, u8 *old, u8 *new);
spinlock_t lock;
};
/*
* struct fcoe_fcf - Fibre-Channel Forwarder.
* @list: list linkage.
* @time: system time (jiffies) when an advertisement was last received.
* @switch_name: WWN of switch from advertisement.
* @fabric_name: WWN of fabric from advertisement.
* @fc_map: FC_MAP value from advertisement.
* @fcf_mac: Ethernet address of the FCF.
* @vfid: virtual fabric ID.
* @pri: seletion priority, smaller values are better.
* @flags: flags received from advertisement.
* @fka_period: keep-alive period, in jiffies.
*
* A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
* passes FCoE frames on to an FC fabric. This structure represents
* one FCF from which advertisements have been received.
*
* When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
* @fcf_mac together form the lookup key.
*/
struct fcoe_fcf {
struct list_head list;
unsigned long time;
u64 switch_name;
u64 fabric_name;
u32 fc_map;
u16 vfid;
u8 fcf_mac[ETH_ALEN];
u8 pri;
u16 flags;
u32 fka_period;
};
/* FIP API functions */
void fcoe_ctlr_init(struct fcoe_ctlr *);
void fcoe_ctlr_destroy(struct fcoe_ctlr *);
void fcoe_ctlr_link_up(struct fcoe_ctlr *);
int fcoe_ctlr_link_down(struct fcoe_ctlr *);
int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct sk_buff *);
void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_frame *fp, u8 *sa);
/* libfcoe funcs */ /* libfcoe funcs */
u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int); u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int);
int fcoe_libfc_config(struct fc_lport *, struct libfc_function_template *); int fcoe_libfc_config(struct fc_lport *, struct libfc_function_template *);
......
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