| /* |
| * 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> |
| |
| #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. |
| * @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; |
| 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 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; |
| }; |
| |
| /** |
| * 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: 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; |
| unsigned long time; |
| |
| u64 switch_name; |
| u64 fabric_name; |
| u32 fc_map; |
| u16 vfid; |
| u8 fcf_mac[ETH_ALEN]; |
| |
| u8 pri; |
| u8 flogi_sent; |
| u16 flags; |
| u32 fka_period; |
| u8 fd_flags:1; |
| }; |
| |
| /** |
| * 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 { |
| 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); |
| |
| /** |
| * 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 |
| * @create: handler to sysfs entry of create for FCoE instances |
| * @destroy: handler to sysfs entry of destroy for FCoE instances |
| * @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 (*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]; |
| }; |
| 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); |
| |
| /** |
| * 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); |
| |
| #endif /* _LIBFCOE_H */ |
