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404 lines
13 KiB
404 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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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* 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_CTLR_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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enum fip_mode { |
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FIP_MODE_AUTO, |
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FIP_MODE_NON_FIP, |
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FIP_MODE_FABRIC, |
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FIP_MODE_VN2VN, |
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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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* @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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* @cdev: (Optional) pointer to sysfs fcoe_ctlr_device. |
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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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* @fip_resp: start FIP VLAN discovery responder |
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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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* @priority: DCBx FCoE APP priority |
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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_mode 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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struct fcoe_ctlr_device *cdev; |
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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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bool map_dest; |
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bool fip_resp; |
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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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/* |
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* This assumes that the fcoe_ctlr (x) is allocated with the fcoe_ctlr_device. |
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*/ |
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#define fcoe_ctlr_to_ctlr_dev(x) \ |
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(x)->cdev |
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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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struct fc_rport_priv rdata; |
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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_mode); |
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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[MAX_ADDR_LEN], 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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int fcoe_link_speed_update(struct fc_lport *); |
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void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *); |
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void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev); |
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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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* @alloc: handler to allocate per-instance FCoE structures |
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* (no discovery or login) |
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* @create: handler to sysfs entry of create for FCoE instances |
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* @destroy: handler to delete per-instance FCoE structures |
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* (frees all memory) |
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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 (*alloc) (struct net_device *device); |
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int (*create) (struct net_device *device, enum fip_mode 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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* @kthread: The thread context (used by bnx2fc) |
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* @work: The work item (used by fcoe) |
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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 *kthread; |
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struct work_struct work; |
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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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struct net_device * (*get_netdev)(const struct fc_lport *lport); |
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}; |
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/** |
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* fcoe_get_netdev() - Return the net device associated with a local port |
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* @lport: The local port to get the net device from |
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*/ |
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static inline struct net_device *fcoe_get_netdev(const struct fc_lport *lport) |
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{ |
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struct fcoe_port *port = ((struct fcoe_port *)lport_priv(lport)); |
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return (port->get_netdev) ? port->get_netdev(lport) : NULL; |
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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(struct timer_list *t); |
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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_set_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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/* sysfs store handler for ctrl_control interface */ |
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ssize_t fcoe_ctlr_create_store(struct bus_type *bus, |
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const char *buf, size_t count); |
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ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus, |
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const char *buf, size_t count); |
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#endif /* _LIBFCOE_H */ |
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