376 lines
13 KiB
C
376 lines
13 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 <linux/random.h>
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#include <scsi/fc/fc_fcoe.h>
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#include <scsi/libfc.h>
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#include <scsi/fcoe_sysfs.h>
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#define FCOE_MAX_CMD_LEN 16 /* Supported CDB length */
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/*
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* Max MTU for FCoE: 14 (FCoE header) + 24 (FC header) + 2112 (max FC payload)
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* + 4 (FC CRC) + 4 (FCoE trailer) = 2158 bytes
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*/
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#define FCOE_MTU 2158
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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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#define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3 /* max. VN2VN rport login retries */
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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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* @FIP_ST_VNMP_START: VN2VN multipath mode start, wait
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* @FIP_ST_VNMP_PROBE1: VN2VN sent first probe, listening
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* @FIP_ST_VNMP_PROBE2: VN2VN sent second probe, listening
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* @FIP_ST_VNMP_CLAIM: VN2VN sent claim, waiting for responses
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* @FIP_ST_VNMP_UP: VN2VN multipath mode operation
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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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FIP_ST_VNMP_START,
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FIP_ST_VNMP_PROBE1,
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FIP_ST_VNMP_PROBE2,
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FIP_ST_VNMP_CLAIM,
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FIP_ST_VNMP_UP,
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};
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/*
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* Modes:
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* The mode is the state that is to be entered after link up.
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* It must not change after fcoe_ctlr_init() sets it.
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*/
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#define FIP_MODE_AUTO FIP_ST_AUTO
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#define FIP_MODE_NON_FIP FIP_ST_NON_FIP
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#define FIP_MODE_FABRIC FIP_ST_ENABLED
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#define FIP_MODE_VN2VN FIP_ST_VNMP_START
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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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* @mode: LLD-selected 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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* @timer_work: &work_struct for doing keep-alives and resets.
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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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* @flogi_req: clone of FLOGI request sent
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* @rnd_state: state for pseudo-random number generator.
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* @port_id: proposed or selected local-port ID.
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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_req_send: send of FLOGI requested
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* @flogi_count: number of FLOGI attempts in AUTO mode.
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* @map_dest: use the FC_MAP mode for destination MAC addresses.
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* @spma: supports SPMA server-provided MACs mode
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* @probe_tries: number of FC_IDs probed
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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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* @send: LLD-supplied function to handle sending FIP Ethernet frames
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* @update_mac: LLD-supplied function to handle changes to MAC addresses.
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* @get_src_addr: LLD-supplied function to supply a source MAC address.
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* @ctlr_mutex: lock protecting this structure.
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* @ctlr_lock: spinlock covering flogi_req
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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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enum fip_state mode;
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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 timer_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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struct sk_buff *flogi_req;
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struct rnd_state rnd_state;
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u32 port_id;
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u16 user_mfs;
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u16 flogi_oxid;
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u8 flogi_req_send;
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u8 flogi_count;
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u8 map_dest;
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u8 spma;
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u8 probe_tries;
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u8 priority;
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u8 dest_addr[ETH_ALEN];
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u8 ctl_src_addr[ETH_ALEN];
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void (*send)(struct fcoe_ctlr *, struct sk_buff *);
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void (*update_mac)(struct fc_lport *, u8 *addr);
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u8 * (*get_src_addr)(struct fc_lport *);
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struct mutex ctlr_mutex;
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spinlock_t ctlr_lock;
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};
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/**
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* fcoe_ctlr_priv() - Return the private data from a fcoe_ctlr
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* @cltr: The fcoe_ctlr whose private data will be returned
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*/
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static inline void *fcoe_ctlr_priv(const struct fcoe_ctlr *ctlr)
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{
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return (void *)(ctlr + 1);
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}
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#define fcoe_ctlr_to_ctlr_dev(x) \
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(struct fcoe_ctlr_device *)(((struct fcoe_ctlr_device *)(x)) - 1)
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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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* @event_work: Work for FC Transport actions queue
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* @event: The event to be processed
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* @fip: The controller that the FCF was discovered on
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* @fcf_dev: The associated fcoe_fcf_device instance
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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 for FIP traffic
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* @fcoe_mac: Ethernet address of the FCF for FCoE traffic
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* @vfid: virtual fabric ID
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* @pri: selection priority, smaller values are better
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* @flogi_sent: current FLOGI sent to this FCF
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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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struct work_struct event_work;
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struct fcoe_ctlr *fip;
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struct fcoe_fcf_device *fcf_dev;
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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 fcoe_mac[ETH_ALEN];
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u8 pri;
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u8 flogi_sent;
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u16 flags;
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u32 fka_period;
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u8 fd_flags:1;
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};
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#define fcoe_fcf_to_fcf_dev(x) \
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((x)->fcf_dev)
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/**
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* struct fcoe_rport - VN2VN remote port
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* @time: time of create or last beacon packet received from node
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* @fcoe_len: max FCoE frame size, not including VLAN or Ethernet headers
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* @flags: flags from probe or claim
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* @login_count: number of unsuccessful rport logins to this port
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* @enode_mac: E_Node control MAC address
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* @vn_mac: VN_Node assigned MAC address for data
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*/
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struct fcoe_rport {
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unsigned long time;
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u16 fcoe_len;
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u16 flags;
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u8 login_count;
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u8 enode_mac[ETH_ALEN];
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u8 vn_mac[ETH_ALEN];
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};
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/* FIP API functions */
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void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_state);
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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 fc_lport *, 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_lport *,
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struct fc_frame *);
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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 fcoe_ctlr *,
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const struct libfc_function_template *, int init_fcp);
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u32 fcoe_fc_crc(struct fc_frame *fp);
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int fcoe_start_io(struct sk_buff *skb);
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int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type);
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void __fcoe_get_lesb(struct fc_lport *lport, struct fc_els_lesb *fc_lesb,
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struct net_device *netdev);
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void fcoe_wwn_to_str(u64 wwn, char *buf, int len);
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int fcoe_validate_vport_create(struct fc_vport *vport);
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/**
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* is_fip_mode() - returns true if FIP mode selected.
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* @fip: FCoE controller.
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*/
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static inline bool is_fip_mode(struct fcoe_ctlr *fip)
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{
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return fip->state == FIP_ST_ENABLED;
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}
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/* helper for FCoE SW HBA drivers, can include subven and subdev if needed. The
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* modpost would use pci_device_id table to auto-generate formatted module alias
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* into the corresponding .mod.c file, but there may or may not be a pci device
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* id table for FCoE drivers so we use the following helper for build the fcoe
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* driver module alias.
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*/
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#define MODULE_ALIAS_FCOE_PCI(ven, dev) \
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MODULE_ALIAS("fcoe-pci:" \
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"v" __stringify(ven) \
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"d" __stringify(dev) "sv*sd*bc*sc*i*")
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/* the name of the default FCoE transport driver fcoe.ko */
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#define FCOE_TRANSPORT_DEFAULT "fcoe"
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/* struct fcoe_transport - The FCoE transport interface
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* @name: a vendor specific name for their FCoE transport driver
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* @attached: whether this transport is already attached
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* @list: list linkage to all attached transports
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* @match: handler to allow the transport driver to match up a given netdev
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* @create: handler to sysfs entry of create for FCoE instances
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* @destroy: handler to sysfs entry of destroy for FCoE instances
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* @enable: handler to sysfs entry of enable for FCoE instances
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* @disable: handler to sysfs entry of disable for FCoE instances
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*/
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struct fcoe_transport {
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char name[IFNAMSIZ];
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bool attached;
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struct list_head list;
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bool (*match) (struct net_device *device);
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int (*create) (struct net_device *device, enum fip_state fip_mode);
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int (*destroy) (struct net_device *device);
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int (*enable) (struct net_device *device);
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int (*disable) (struct net_device *device);
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};
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/**
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* struct fcoe_percpu_s - The context for FCoE receive thread(s)
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* @thread: The thread context
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* @fcoe_rx_list: The queue of pending packets to process
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* @page: The memory page for calculating frame trailer CRCs
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* @crc_eof_offset: The offset into the CRC page pointing to available
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* memory for a new trailer
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*/
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struct fcoe_percpu_s {
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struct task_struct *thread;
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struct sk_buff_head fcoe_rx_list;
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struct page *crc_eof_page;
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int crc_eof_offset;
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};
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/**
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* struct fcoe_port - The FCoE private structure
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* @priv: The associated fcoe interface. The structure is
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* defined by the low level driver
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* @lport: The associated local port
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* @fcoe_pending_queue: The pending Rx queue of skbs
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* @fcoe_pending_queue_active: Indicates if the pending queue is active
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* @max_queue_depth: Max queue depth of pending queue
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* @min_queue_depth: Min queue depth of pending queue
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* @timer: The queue timer
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* @destroy_work: Handle for work context
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* (to prevent RTNL deadlocks)
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* @data_srt_addr: Source address for data
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*
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* An instance of this structure is to be allocated along with the
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* Scsi_Host and libfc fc_lport structures.
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*/
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struct fcoe_port {
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void *priv;
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struct fc_lport *lport;
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struct sk_buff_head fcoe_pending_queue;
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u8 fcoe_pending_queue_active;
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u32 max_queue_depth;
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u32 min_queue_depth;
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struct timer_list timer;
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struct work_struct destroy_work;
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u8 data_src_addr[ETH_ALEN];
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};
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void fcoe_clean_pending_queue(struct fc_lport *);
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void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb);
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void fcoe_queue_timer(ulong lport);
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int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
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struct fcoe_percpu_s *fps);
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/* FCoE Sysfs helpers */
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void fcoe_fcf_get_selected(struct fcoe_fcf_device *);
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void fcoe_ctlr_get_fip_mode(struct fcoe_ctlr_device *);
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/**
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* struct netdev_list
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* A mapping from netdevice to fcoe_transport
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*/
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struct fcoe_netdev_mapping {
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struct list_head list;
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struct net_device *netdev;
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struct fcoe_transport *ft;
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};
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/* fcoe transports registration and deregistration */
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int fcoe_transport_attach(struct fcoe_transport *ft);
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int fcoe_transport_detach(struct fcoe_transport *ft);
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#endif /* _LIBFCOE_H */
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