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