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linux/include/scsi/libfcoe.h
Robert Love 9d34876f82 libfcoe: Make fcoe_sysfs optional / fix fnic NULL exception 
fnic doesn't use any of the create/destroy/enable/disable interfaces
either from the (legacy) module paramaters or the (new) fcoe_sysfs
interfaces. When fcoe_sysfs was introduced fnic wasn't changed since
it wasn't using the interfaces. libfcoe incorrectly assumed that that
all of its users were using fcoe_sysfs and when adding and deleting
FCFs would assume the existance of a fcoe_ctlr_device. fnic was not
allocating this structure because it doesn't care about the standard
user interfaces (fnic starts on link only). If/When libfcoe tried to use
the fcoe_ctlr_device's lock for the first time a NULL pointer exception
would be triggered.

Since fnic doesn't care about sysfs or user interfaces, the solution
is to drop libfcoe's assumption that all drivers are using fcoe_sysfs.

This patch accomplishes this by changing some of the structure
relationships.

We need a way to determine when a LLD is using fcoe_sysfs or not and
we can do that by checking for the existance of the fcoe_ctlr_device.
Prior to this patch, it was assumed that the fcoe_ctlr structure was
allocated with the fcoe_ctlr_device and immediately followed it in
memory. To reach the fcoe_ctlr_device we would simply go back in memory
from the fcoe_ctlr to get the fcoe_ctlr_device.

Since fnic doesn't allocate the fcoe_ctlr_device, we cannot keep that
assumption. This patch adds a pointer from the fcoe_ctlr to the
fcoe_ctlr_device. For bnx2fc and fcoe we will continue to allocate the
two structures together, but then we'll set the ctlr->cdev pointer
to point at the fcoe_ctlr_device. fnic will not change and will continue
to allocate the fcoe_ctlr itself, and ctlr->cdev will remain NULL.

When libfcoe adds fcoe_fcf's to the fcoe_ctlr it will check if ctlr->cdev
is set and only if so will it continue to interact with fcoe_sysfs.

Signed-off-by: Robert Love <robert.w.love@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Tested-by: Hiral Patel <hiralpat@cisco.com>
2013-10-11 13:25:40 -07:00

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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 {
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 */
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