97c8389d54
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: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
164 lines
5.6 KiB
C
164 lines
5.6 KiB
C
/*
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* Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2007-2008 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#ifndef _LIBFCOE_H
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#define _LIBFCOE_H
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/workqueue.h>
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#include <scsi/fc/fc_fcoe.h>
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#include <scsi/libfc.h>
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/*
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* FIP tunable parameters.
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*/
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#define FCOE_CTLR_START_DELAY 2000 /* mS after first adv. to choose FCF */
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#define FCOE_CTRL_SOL_TOV 2000 /* min. solicitation interval (mS) */
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#define FCOE_CTLR_FCF_LIMIT 20 /* max. number of FCF entries */
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/**
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* enum fip_state - internal state of FCoE controller.
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* @FIP_ST_DISABLED: controller has been disabled or not yet enabled.
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* @FIP_ST_LINK_WAIT: the physical link is down or unusable.
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* @FIP_ST_AUTO: determining whether to use FIP or non-FIP mode.
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* @FIP_ST_NON_FIP: non-FIP mode selected.
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* @FIP_ST_ENABLED: FIP mode selected.
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*/
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enum fip_state {
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FIP_ST_DISABLED,
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FIP_ST_LINK_WAIT,
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FIP_ST_AUTO,
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FIP_ST_NON_FIP,
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FIP_ST_ENABLED,
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};
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/**
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* struct fcoe_ctlr - FCoE Controller and FIP state.
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* @state: internal FIP state for network link and FIP or non-FIP mode.
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* @lp: &fc_lport: libfc local port.
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* @sel_fcf: currently selected FCF, or NULL.
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* @fcfs: list of discovered FCFs.
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* @fcf_count: number of discovered FCF entries.
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* @sol_time: time when a multicast solicitation was last sent.
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* @sel_time: time after which to select an FCF.
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* @port_ka_time: time of next port keep-alive.
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* @ctlr_ka_time: time of next controller keep-alive.
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* @timer: timer struct used for all delayed events.
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* @link_work: &work_struct for doing FCF selection.
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* @recv_work: &work_struct for receiving FIP frames.
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* @fip_recv_list: list of received FIP frames.
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* @user_mfs: configured maximum FC frame size, including FC header.
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* @flogi_oxid: exchange ID of most recent fabric login.
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* @flogi_count: number of FLOGI attempts in AUTO mode.
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* @link: current link status for libfc.
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* @last_link: last link state reported to libfc.
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* @map_dest: use the FC_MAP mode for destination MAC addresses.
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* @dest_addr: MAC address of the selected FC forwarder.
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* @ctl_src_addr: the native MAC address of our local port.
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* @data_src_addr: the assigned MAC address for the local port after FLOGI.
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* @send: LLD-supplied function to handle sending of FIP Ethernet frames.
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* @update_mac: LLD-supplied function to handle changes to MAC addresses.
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* @lock: lock protecting this structure.
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*
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* This structure is used by all FCoE drivers. It contains information
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* needed by all FCoE low-level drivers (LLDs) as well as internal state
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* for FIP, and fields shared with the LLDS.
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*/
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struct fcoe_ctlr {
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enum fip_state state;
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struct fc_lport *lp;
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struct fcoe_fcf *sel_fcf;
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struct list_head fcfs;
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u16 fcf_count;
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unsigned long sol_time;
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unsigned long sel_time;
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unsigned long port_ka_time;
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unsigned long ctlr_ka_time;
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struct timer_list timer;
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struct work_struct link_work;
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struct work_struct recv_work;
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struct sk_buff_head fip_recv_list;
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u16 user_mfs;
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u16 flogi_oxid;
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u8 flogi_count;
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u8 link;
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u8 last_link;
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u8 map_dest;
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u8 dest_addr[ETH_ALEN];
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u8 ctl_src_addr[ETH_ALEN];
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u8 data_src_addr[ETH_ALEN];
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void (*send)(struct fcoe_ctlr *, struct sk_buff *);
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void (*update_mac)(struct fcoe_ctlr *, u8 *old, u8 *new);
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spinlock_t lock;
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};
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/*
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* struct fcoe_fcf - Fibre-Channel Forwarder.
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* @list: list linkage.
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* @time: system time (jiffies) when an advertisement was last received.
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* @switch_name: WWN of switch from advertisement.
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* @fabric_name: WWN of fabric from advertisement.
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* @fc_map: FC_MAP value from advertisement.
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* @fcf_mac: Ethernet address of the FCF.
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* @vfid: virtual fabric ID.
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* @pri: seletion priority, smaller values are better.
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* @flags: flags received from advertisement.
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* @fka_period: keep-alive period, in jiffies.
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*
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* A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that
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* passes FCoE frames on to an FC fabric. This structure represents
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* one FCF from which advertisements have been received.
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*
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* When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and
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* @fcf_mac together form the lookup key.
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*/
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struct fcoe_fcf {
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struct list_head list;
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unsigned long time;
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u64 switch_name;
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u64 fabric_name;
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u32 fc_map;
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u16 vfid;
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u8 fcf_mac[ETH_ALEN];
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u8 pri;
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u16 flags;
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u32 fka_period;
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};
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/* FIP API functions */
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void fcoe_ctlr_init(struct fcoe_ctlr *);
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void fcoe_ctlr_destroy(struct fcoe_ctlr *);
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void fcoe_ctlr_link_up(struct fcoe_ctlr *);
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int fcoe_ctlr_link_down(struct fcoe_ctlr *);
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int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct sk_buff *);
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void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *);
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int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_frame *fp, u8 *sa);
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/* libfcoe funcs */
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u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int);
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int fcoe_libfc_config(struct fc_lport *, struct libfc_function_template *);
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#endif /* _LIBFCOE_H */
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