libfcoe.c 38.4 KB
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/*
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 * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2009 Intel Corporation.  All rights reserved.
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 *
 * 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
 */

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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/errno.h>
#include <linux/bitops.h>
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#include <linux/slab.h>
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#include <net/rtnetlink.h>

#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fcoe.h>
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#include <scsi/libfc.h>
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#include <scsi/libfcoe.h>
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MODULE_AUTHOR("Open-FCoE.org");
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MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs");
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MODULE_LICENSE("GPL v2");
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#define	FCOE_CTLR_MIN_FKA	500		/* min keep alive (mS) */
#define	FCOE_CTLR_DEF_FKA	FIP_DEF_FKA	/* default keep alive (mS) */

static void fcoe_ctlr_timeout(unsigned long);
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static void fcoe_ctlr_timer_work(struct work_struct *);
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static void fcoe_ctlr_recv_work(struct work_struct *);

static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;

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unsigned int libfcoe_debug_logging;
module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
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#define LIBFCOE_LOGGING	    0x01 /* General logging, not categorized */
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#define LIBFCOE_FIP_LOGGING 0x02 /* FIP logging */

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#define LIBFCOE_CHECK_LOGGING(LEVEL, CMD)		\
do {							\
	if (unlikely(libfcoe_debug_logging & LEVEL))	\
		do {					\
			CMD;				\
		} while (0);				\
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} while (0)
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#define LIBFCOE_DBG(fmt, args...)					\
	LIBFCOE_CHECK_LOGGING(LIBFCOE_LOGGING,				\
			      printk(KERN_INFO "libfcoe: " fmt, ##args);)
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#define LIBFCOE_FIP_DBG(fip, fmt, args...)				\
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	LIBFCOE_CHECK_LOGGING(LIBFCOE_FIP_LOGGING,			\
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			      printk(KERN_INFO "host%d: fip: " fmt, 	\
				     (fip)->lp->host->host_no, ##args);)
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/**
 * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
 * @fcf: The FCF to check
 *
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 * Return non-zero if FCF fcoe_size has been validated.
 */
static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
{
	return (fcf->flags & FIP_FL_SOL) != 0;
}

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/**
 * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
 * @fcf: The FCF to check
 *
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 * Return non-zero if the FCF is usable.
 */
static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
{
	u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;

	return (fcf->flags & flags) == flags;
}

/**
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 * fcoe_ctlr_init() - Initialize the FCoE Controller instance
 * @fip: The FCoE controller to initialize
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 */
void fcoe_ctlr_init(struct fcoe_ctlr *fip)
{
	fip->state = FIP_ST_LINK_WAIT;
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	fip->mode = FIP_ST_AUTO;
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	INIT_LIST_HEAD(&fip->fcfs);
	spin_lock_init(&fip->lock);
	fip->flogi_oxid = FC_XID_UNKNOWN;
	setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
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	INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
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	INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
	skb_queue_head_init(&fip->fip_recv_list);
}
EXPORT_SYMBOL(fcoe_ctlr_init);

/**
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 * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
 * @fip: The FCoE controller whose FCFs are to be reset
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 *
 * Called with &fcoe_ctlr lock held.
 */
static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *next;

	fip->sel_fcf = NULL;
	list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
		list_del(&fcf->list);
		kfree(fcf);
	}
	fip->fcf_count = 0;
	fip->sel_time = 0;
}

/**
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 * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
 * @fip: The FCoE controller to tear down
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 *
 * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 *
 * The receive handler will have been deleted before this to guarantee
 * that no more recv_work will be scheduled.
 *
 * The timer routine will simply return once we set FIP_ST_DISABLED.
 * This guarantees that no further timeouts or work will be scheduled.
 */
void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
{
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	cancel_work_sync(&fip->recv_work);
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	skb_queue_purge(&fip->fip_recv_list);
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	spin_lock_bh(&fip->lock);
	fip->state = FIP_ST_DISABLED;
	fcoe_ctlr_reset_fcfs(fip);
	spin_unlock_bh(&fip->lock);
	del_timer_sync(&fip->timer);
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	cancel_work_sync(&fip->timer_work);
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}
EXPORT_SYMBOL(fcoe_ctlr_destroy);

/**
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 * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
 * @fip: The FCoE controller to get the maximum FCoE size from
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 *
 * Returns the maximum packet size including the FCoE header and trailer,
 * but not including any Ethernet or VLAN headers.
 */
static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
{
	/*
	 * Determine the max FCoE frame size allowed, including
	 * FCoE header and trailer.
	 * Note:  lp->mfs is currently the payload size, not the frame size.
	 */
	return fip->lp->mfs + sizeof(struct fc_frame_header) +
		sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
}

/**
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 * fcoe_ctlr_solicit() - Send a FIP solicitation
 * @fip: The FCoE controller to send the solicitation on
 * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
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 */
static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
{
	struct sk_buff *skb;
	struct fip_sol {
		struct ethhdr eth;
		struct fip_header fip;
		struct {
			struct fip_mac_desc mac;
			struct fip_wwn_desc wwnn;
			struct fip_size_desc size;
		} __attribute__((packed)) desc;
	}  __attribute__((packed)) *sol;
	u32 fcoe_size;

	skb = dev_alloc_skb(sizeof(*sol));
	if (!skb)
		return;

	sol = (struct fip_sol *)skb->data;

	memset(sol, 0, sizeof(*sol));
	memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
	memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
	sol->eth.h_proto = htons(ETH_P_FIP);

	sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	sol->fip.fip_op = htons(FIP_OP_DISC);
	sol->fip.fip_subcode = FIP_SC_SOL;
	sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
	sol->fip.fip_flags = htons(FIP_FL_FPMA);
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	if (fip->spma)
		sol->fip.fip_flags |= htons(FIP_FL_SPMA);
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	sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
	sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
	memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);

	sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
	sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
	put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);

	fcoe_size = fcoe_ctlr_fcoe_size(fip);
	sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
	sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
	sol->desc.size.fd_size = htons(fcoe_size);

	skb_put(skb, sizeof(*sol));
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	skb->protocol = htons(ETH_P_FIP);
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	fip->send(fip, skb);

	if (!fcf)
		fip->sol_time = jiffies;
}

/**
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 * fcoe_ctlr_link_up() - Start FCoE controller
 * @fip: The FCoE controller to start
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 *
 * Called from the LLD when the network link is ready.
 */
void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
{
	spin_lock_bh(&fip->lock);
	if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
		spin_unlock_bh(&fip->lock);
		fc_linkup(fip->lp);
	} else if (fip->state == FIP_ST_LINK_WAIT) {
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		fip->state = fip->mode;
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		spin_unlock_bh(&fip->lock);
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		if (fip->state == FIP_ST_AUTO)
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			LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
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		fc_linkup(fip->lp);
		fcoe_ctlr_solicit(fip, NULL);
	} else
		spin_unlock_bh(&fip->lock);
}
EXPORT_SYMBOL(fcoe_ctlr_link_up);

/**
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 * fcoe_ctlr_reset() - Reset a FCoE controller
 * @fip:       The FCoE controller to reset
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 */
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static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
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{
	fcoe_ctlr_reset_fcfs(fip);
	del_timer(&fip->timer);
	fip->ctlr_ka_time = 0;
	fip->port_ka_time = 0;
	fip->sol_time = 0;
	fip->flogi_oxid = FC_XID_UNKNOWN;
	fip->map_dest = 0;
}

/**
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 * fcoe_ctlr_link_down() - Stop a FCoE controller
 * @fip: The FCoE controller to be stopped
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 *
 * Returns non-zero if the link was up and now isn't.
 *
 * Called from the LLD when the network link is not ready.
 * There may be multiple calls while the link is down.
 */
int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
{
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	int link_dropped;

	LIBFCOE_FIP_DBG(fip, "link down.\n");
	spin_lock_bh(&fip->lock);
	fcoe_ctlr_reset(fip);
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	link_dropped = fip->state != FIP_ST_LINK_WAIT;
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	fip->state = FIP_ST_LINK_WAIT;
	spin_unlock_bh(&fip->lock);

	if (link_dropped)
		fc_linkdown(fip->lp);
	return link_dropped;
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}
EXPORT_SYMBOL(fcoe_ctlr_link_down);

/**
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 * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
 * @fip:   The FCoE controller to send the FKA on
 * @lport: libfc fc_lport to send from
 * @ports: 0 for controller keep-alive, 1 for port keep-alive
 * @sa:	   The source MAC address
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 *
 * A controller keep-alive is sent every fka_period (typically 8 seconds).
 * The source MAC is the native MAC address.
 *
 * A port keep-alive is sent every 90 seconds while logged in.
 * The source MAC is the assigned mapped source address.
 * The destination is the FCF's F-port.
 */
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static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
				      struct fc_lport *lport,
				      int ports, u8 *sa)
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{
	struct sk_buff *skb;
	struct fip_kal {
		struct ethhdr eth;
		struct fip_header fip;
		struct fip_mac_desc mac;
	} __attribute__((packed)) *kal;
	struct fip_vn_desc *vn;
	u32 len;
	struct fc_lport *lp;
	struct fcoe_fcf *fcf;

	fcf = fip->sel_fcf;
	lp = fip->lp;
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	if (!fcf || (ports && !lp->port_id))
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		return;

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	len = sizeof(*kal) + ports * sizeof(*vn);
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	skb = dev_alloc_skb(len);
	if (!skb)
		return;

	kal = (struct fip_kal *)skb->data;
	memset(kal, 0, len);
	memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
	memcpy(kal->eth.h_source, sa, ETH_ALEN);
	kal->eth.h_proto = htons(ETH_P_FIP);

	kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	kal->fip.fip_op = htons(FIP_OP_CTRL);
	kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
	kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
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				     ports * sizeof(*vn)) / FIP_BPW);
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	kal->fip.fip_flags = htons(FIP_FL_FPMA);
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	if (fip->spma)
		kal->fip.fip_flags |= htons(FIP_FL_SPMA);
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	kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
	kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
	memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
	if (ports) {
		vn = (struct fip_vn_desc *)(kal + 1);
		vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
		vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
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		memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
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		hton24(vn->fd_fc_id, lport->port_id);
		put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
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	}
	skb_put(skb, len);
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	skb->protocol = htons(ETH_P_FIP);
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	fip->send(fip, skb);
}

/**
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 * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
 * @fip:   The FCoE controller for the ELS frame
 * @dtype: The FIP descriptor type for the frame
 * @skb:   The FCoE ELS frame including FC header but no FCoE headers
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 *
 * Returns non-zero error code on failure.
 *
 * The caller must check that the length is a multiple of 4.
 *
 * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 * Headroom includes the FIP encapsulation description, FIP header, and
 * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 */
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static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
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			    u8 dtype, struct sk_buff *skb)
{
	struct fip_encaps_head {
		struct ethhdr eth;
		struct fip_header fip;
		struct fip_encaps encaps;
	} __attribute__((packed)) *cap;
	struct fip_mac_desc *mac;
	struct fcoe_fcf *fcf;
	size_t dlen;
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	u16 fip_flags;
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	fcf = fip->sel_fcf;
	if (!fcf)
		return -ENODEV;
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	/* set flags according to both FCF and lport's capability on SPMA */
	fip_flags = fcf->flags;
	fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : FIP_FL_FPMA;
	if (!fip_flags)
		return -ENODEV;

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	dlen = sizeof(struct fip_encaps) + skb->len;	/* len before push */
	cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));

	memset(cap, 0, sizeof(*cap));
	memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
	memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
	cap->eth.h_proto = htons(ETH_P_FIP);

	cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	cap->fip.fip_op = htons(FIP_OP_LS);
	cap->fip.fip_subcode = FIP_SC_REQ;
	cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW);
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	cap->fip.fip_flags = htons(fip_flags);
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	cap->encaps.fd_desc.fip_dtype = dtype;
	cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;

	mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
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	memset(mac, 0, sizeof(*mac));
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	mac->fd_desc.fip_dtype = FIP_DT_MAC;
	mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
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	if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
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		memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
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	} else if (fip_flags & FIP_FL_SPMA) {
		LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
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		memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
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	} else {
		LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
		/* FPMA only FLOGI must leave the MAC desc set to all 0s */
	}
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	skb->protocol = htons(ETH_P_FIP);
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	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	return 0;
}

/**
 * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 * @fip:	FCoE controller.
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 * @lport:	libfc fc_lport to send from
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 * @skb:	FCoE ELS frame including FC header but no FCoE headers.
 *
 * Returns a non-zero error code if the frame should not be sent.
 * Returns zero if the caller should send the frame with FCoE encapsulation.
 *
 * The caller must check that the length is a multiple of 4.
 * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 */
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int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
		       struct sk_buff *skb)
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{
	struct fc_frame_header *fh;
	u16 old_xid;
	u8 op;
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	u8 mac[ETH_ALEN];
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	fh = (struct fc_frame_header *)skb->data;
	op = *(u8 *)(fh + 1);

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	if (op == ELS_FLOGI) {
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		old_xid = fip->flogi_oxid;
		fip->flogi_oxid = ntohs(fh->fh_ox_id);
		if (fip->state == FIP_ST_AUTO) {
			if (old_xid == FC_XID_UNKNOWN)
				fip->flogi_count = 0;
			fip->flogi_count++;
			if (fip->flogi_count < 3)
				goto drop;
			fip->map_dest = 1;
			return 0;
		}
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		if (fip->state == FIP_ST_NON_FIP)
			fip->map_dest = 1;
	}

	if (fip->state == FIP_ST_NON_FIP)
		return 0;
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	if (!fip->sel_fcf)
		goto drop;
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	switch (op) {
	case ELS_FLOGI:
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		op = FIP_DT_FLOGI;
		break;
	case ELS_FDISC:
		if (ntoh24(fh->fh_s_id))
			return 0;
		op = FIP_DT_FDISC;
		break;
	case ELS_LOGO:
		if (fip->state != FIP_ST_ENABLED)
			return 0;
		if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
			return 0;
		op = FIP_DT_LOGO;
		break;
	case ELS_LS_ACC:
		if (fip->flogi_oxid == FC_XID_UNKNOWN)
			return 0;
		if (!ntoh24(fh->fh_s_id))
			return 0;
		if (fip->state == FIP_ST_AUTO)
			return 0;
		/*
		 * Here we must've gotten an SID by accepting an FLOGI
		 * from a point-to-point connection.  Switch to using
		 * the source mac based on the SID.  The destination
		 * MAC in this case would have been set by receving the
		 * FLOGI.
		 */
		fip->flogi_oxid = FC_XID_UNKNOWN;
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		fc_fcoe_set_mac(mac, fh->fh_d_id);
		fip->update_mac(lport, mac);
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		return 0;
	default:
		if (fip->state != FIP_ST_ENABLED)
			goto drop;
		return 0;
	}
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	if (fcoe_ctlr_encaps(fip, lport, op, skb))
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		goto drop;
	fip->send(fip, skb);
	return -EINPROGRESS;
drop:
	kfree_skb(skb);
	return -EINVAL;
}
EXPORT_SYMBOL(fcoe_ctlr_els_send);

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/**
 * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
 * @fip: The FCoE controller to free FCFs on
557
 *
558
 * Called with lock held and preemption disabled.
559
 *
560 561 562
 * An FCF is considered old if we have missed two advertisements.
 * That is, there have been no valid advertisement from it for 2.5
 * times its keep-alive period.
563 564
 *
 * In addition, determine the time when an FCF selection can occur.
565 566 567
 *
 * Also, increment the MissDiscAdvCount when no advertisement is received
 * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
568 569
 *
 * Returns the time in jiffies for the next call.
570
 */
571
static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
572 573 574
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *next;
575 576
	unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
	unsigned long deadline;
577
	unsigned long sel_time = 0;
578
	struct fcoe_dev_stats *stats;
579 580

	list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
581 582 583 584 585 586 587 588 589 590 591 592 593
		deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
		if (fip->sel_fcf == fcf) {
			if (time_after(jiffies, deadline)) {
				stats = per_cpu_ptr(fip->lp->dev_stats,
						    smp_processor_id());
				stats->MissDiscAdvCount++;
				printk(KERN_INFO "libfcoe: host%d: "
				       "Missing Discovery Advertisement "
				       "for fab %16.16llx count %lld\n",
				       fip->lp->host->host_no, fcf->fabric_name,
				       stats->MissDiscAdvCount);
			} else if (time_after(next_timer, deadline))
				next_timer = deadline;
594
		}
595 596

		deadline += fcf->fka_period;
597
		if (time_after_eq(jiffies, deadline)) {
598 599 600 601 602 603
			if (fip->sel_fcf == fcf)
				fip->sel_fcf = NULL;
			list_del(&fcf->list);
			WARN_ON(!fip->fcf_count);
			fip->fcf_count--;
			kfree(fcf);
604 605 606
			stats = per_cpu_ptr(fip->lp->dev_stats,
					    smp_processor_id());
			stats->VLinkFailureCount++;
607 608 609 610 611 612
		} else {
			if (time_after(next_timer, deadline))
				next_timer = deadline;
			if (fcoe_ctlr_mtu_valid(fcf) &&
			    (!sel_time || time_before(sel_time, fcf->time)))
				sel_time = fcf->time;
613 614
		}
	}
615
	if (sel_time && !fip->sel_fcf && !fip->sel_time) {
616 617 618
		sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
		fip->sel_time = sel_time;
	}
619

620
	return next_timer;
621 622 623
}

/**
624
 * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
625
 * @fip: The FCoE controller receiving the advertisement
626 627
 * @skb: The received FIP advertisement frame
 * @fcf: The resulting FCF entry
628 629 630 631
 *
 * Returns zero on a valid parsed advertisement,
 * otherwise returns non zero value.
 */
632 633
static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
			       struct sk_buff *skb, struct fcoe_fcf *fcf)
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
{
	struct fip_header *fiph;
	struct fip_desc *desc = NULL;
	struct fip_wwn_desc *wwn;
	struct fip_fab_desc *fab;
	struct fip_fka_desc *fka;
	unsigned long t;
	size_t rlen;
	size_t dlen;

	memset(fcf, 0, sizeof(*fcf));
	fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);

	fiph = (struct fip_header *)skb->data;
	fcf->flags = ntohs(fiph->fip_flags);

	rlen = ntohs(fiph->fip_dl_len) * 4;
	if (rlen + sizeof(*fiph) > skb->len)
		return -EINVAL;

	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen < sizeof(*desc) || dlen > rlen)
			return -EINVAL;
		switch (desc->fip_dtype) {
		case FIP_DT_PRI:
			if (dlen != sizeof(struct fip_pri_desc))
				goto len_err;
			fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
			break;
		case FIP_DT_MAC:
			if (dlen != sizeof(struct fip_mac_desc))
				goto len_err;
			memcpy(fcf->fcf_mac,
			       ((struct fip_mac_desc *)desc)->fd_mac,
			       ETH_ALEN);
			if (!is_valid_ether_addr(fcf->fcf_mac)) {
672
				LIBFCOE_FIP_DBG(fip, "Invalid MAC address "
673
						"in FIP adv\n");
674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694
				return -EINVAL;
			}
			break;
		case FIP_DT_NAME:
			if (dlen != sizeof(struct fip_wwn_desc))
				goto len_err;
			wwn = (struct fip_wwn_desc *)desc;
			fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
			break;
		case FIP_DT_FAB:
			if (dlen != sizeof(struct fip_fab_desc))
				goto len_err;
			fab = (struct fip_fab_desc *)desc;
			fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
			fcf->vfid = ntohs(fab->fd_vfid);
			fcf->fc_map = ntoh24(fab->fd_map);
			break;
		case FIP_DT_FKA:
			if (dlen != sizeof(struct fip_fka_desc))
				goto len_err;
			fka = (struct fip_fka_desc *)desc;
695 696
			if (fka->fd_flags & FIP_FKA_ADV_D)
				fcf->fd_flags = 1;
697 698 699 700 701 702 703 704 705 706 707
			t = ntohl(fka->fd_fka_period);
			if (t >= FCOE_CTLR_MIN_FKA)
				fcf->fka_period = msecs_to_jiffies(t);
			break;
		case FIP_DT_MAP_OUI:
		case FIP_DT_FCOE_SIZE:
		case FIP_DT_FLOGI:
		case FIP_DT_FDISC:
		case FIP_DT_LOGO:
		case FIP_DT_ELP:
		default:
708
			LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
709
					"in FIP adv\n", desc->fip_dtype);
710 711 712
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				return -EINVAL;
713
			break;
714 715 716 717 718 719 720 721 722 723 724
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}
	if (!fcf->fc_map || (fcf->fc_map & 0x10000))
		return -EINVAL;
	if (!fcf->switch_name || !fcf->fabric_name)
		return -EINVAL;
	return 0;

len_err:
725
	LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
726
			desc->fip_dtype, dlen);
727 728 729 730
	return -EINVAL;
}

/**
731 732 733
 * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
 * @fip: The FCoE controller receiving the advertisement
 * @skb: The received FIP packet
734 735 736 737 738 739 740 741 742 743
 */
static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf new;
	struct fcoe_fcf *found;
	unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
	int first = 0;
	int mtu_valid;

744
	if (fcoe_ctlr_parse_adv(fip, skb, &new))
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
		return;

	spin_lock_bh(&fip->lock);
	first = list_empty(&fip->fcfs);
	found = NULL;
	list_for_each_entry(fcf, &fip->fcfs, list) {
		if (fcf->switch_name == new.switch_name &&
		    fcf->fabric_name == new.fabric_name &&
		    fcf->fc_map == new.fc_map &&
		    compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) {
			found = fcf;
			break;
		}
	}
	if (!found) {
		if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
			goto out;

		fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
		if (!fcf)
			goto out;

		fip->fcf_count++;
		memcpy(fcf, &new, sizeof(new));
		list_add(&fcf->list, &fip->fcfs);
	} else {
		/*
		 * Flags in advertisements are ignored once the FCF is
		 * selected.  Flags in unsolicited advertisements are
		 * ignored after a usable solicited advertisement
		 * has been received.
		 */
777
		if (fcf == fip->sel_fcf && !fcf->fd_flags) {
778 779 780 781 782 783 784 785 786 787 788
			fip->ctlr_ka_time -= fcf->fka_period;
			fip->ctlr_ka_time += new.fka_period;
			if (time_before(fip->ctlr_ka_time, fip->timer.expires))
				mod_timer(&fip->timer, fip->ctlr_ka_time);
		} else if (!fcoe_ctlr_fcf_usable(fcf))
			fcf->flags = new.flags;
		fcf->fka_period = new.fka_period;
		memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
	}
	mtu_valid = fcoe_ctlr_mtu_valid(fcf);
	fcf->time = jiffies;
789
	if (!found) {
790 791
		LIBFCOE_FIP_DBG(fip, "New FCF for fab %16.16llx "
				"map %x val %d\n",
792 793
				fcf->fabric_name, fcf->fc_map, mtu_valid);
	}
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814

	/*
	 * If this advertisement is not solicited and our max receive size
	 * hasn't been verified, send a solicited advertisement.
	 */
	if (!mtu_valid)
		fcoe_ctlr_solicit(fip, fcf);

	/*
	 * If its been a while since we did a solicit, and this is
	 * the first advertisement we've received, do a multicast
	 * solicitation to gather as many advertisements as we can
	 * before selection occurs.
	 */
	if (first && time_after(jiffies, fip->sol_time + sol_tov))
		fcoe_ctlr_solicit(fip, NULL);

	/*
	 * If this is the first validated FCF, note the time and
	 * set a timer to trigger selection.
	 */
815
	if (mtu_valid && !fip->sel_fcf && fcoe_ctlr_fcf_usable(fcf)) {
816
		fip->sel_time = jiffies +
817
			msecs_to_jiffies(FCOE_CTLR_START_DELAY);
818 819 820 821 822 823 824 825 826
		if (!timer_pending(&fip->timer) ||
		    time_before(fip->sel_time, fip->timer.expires))
			mod_timer(&fip->timer, fip->sel_time);
	}
out:
	spin_unlock_bh(&fip->lock);
}

/**
827 828 829
 * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
 * @fip: The FCoE controller which received the packet
 * @skb: The received FIP packet
830 831 832
 */
static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
833
	struct fc_lport *lport = fip->lp;
834
	struct fip_header *fiph;
835
	struct fc_frame *fp = (struct fc_frame *)skb;
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
	struct fc_frame_header *fh = NULL;
	struct fip_desc *desc;
	struct fip_encaps *els;
	struct fcoe_dev_stats *stats;
	enum fip_desc_type els_dtype = 0;
	u8 els_op;
	u8 sub;
	u8 granted_mac[ETH_ALEN] = { 0 };
	size_t els_len = 0;
	size_t rlen;
	size_t dlen;

	fiph = (struct fip_header *)skb->data;
	sub = fiph->fip_subcode;
	if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
		goto drop;

	rlen = ntohs(fiph->fip_dl_len) * 4;
	if (rlen + sizeof(*fiph) > skb->len)
		goto drop;

	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen < sizeof(*desc) || dlen > rlen)
			goto drop;
		switch (desc->fip_dtype) {
		case FIP_DT_MAC:
			if (dlen != sizeof(struct fip_mac_desc))
				goto len_err;
			memcpy(granted_mac,
			       ((struct fip_mac_desc *)desc)->fd_mac,
			       ETH_ALEN);
			if (!is_valid_ether_addr(granted_mac)) {
870
				LIBFCOE_FIP_DBG(fip, "Invalid MAC address "
871
						"in FIP ELS\n");
872 873
				goto drop;
			}
874
			memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
			break;
		case FIP_DT_FLOGI:
		case FIP_DT_FDISC:
		case FIP_DT_LOGO:
		case FIP_DT_ELP:
			if (fh)
				goto drop;
			if (dlen < sizeof(*els) + sizeof(*fh) + 1)
				goto len_err;
			els_len = dlen - sizeof(*els);
			els = (struct fip_encaps *)desc;
			fh = (struct fc_frame_header *)(els + 1);
			els_dtype = desc->fip_dtype;
			break;
		default:
890
			LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
891
					"in FIP adv\n", desc->fip_dtype);
892 893 894
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				goto drop;
895
			break;
896 897 898 899 900 901 902 903 904
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}

	if (!fh)
		goto drop;
	els_op = *(u8 *)(fh + 1);

905 906 907
	if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP &&
	    fip->flogi_oxid == ntohs(fh->fh_ox_id) &&
	    els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac))
908 909 910 911 912 913 914 915 916 917 918
		fip->flogi_oxid = FC_XID_UNKNOWN;

	/*
	 * Convert skb into an fc_frame containing only the ELS.
	 */
	skb_pull(skb, (u8 *)fh - skb->data);
	skb_trim(skb, els_len);
	fp = (struct fc_frame *)skb;
	fc_frame_init(fp);
	fr_sof(fp) = FC_SOF_I3;
	fr_eof(fp) = FC_EOF_T;
919
	fr_dev(fp) = lport;
920

921
	stats = per_cpu_ptr(lport->dev_stats, get_cpu());
922 923
	stats->RxFrames++;
	stats->RxWords += skb->len / FIP_BPW;
924
	put_cpu();
925

926
	fc_exch_recv(lport, fp);
927 928 929
	return;

len_err:
930
	LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
931
			desc->fip_dtype, dlen);
932 933 934 935 936
drop:
	kfree_skb(skb);
}

/**
937 938 939
 * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
 * @fip: The FCoE controller that received the frame
 * @fh:	 The received FIP header
940 941 942 943 944
 *
 * There may be multiple VN_Port descriptors.
 * The overall length has already been checked.
 */
static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
945
				     struct fip_header *fh)
946 947 948 949 950 951 952 953
{
	struct fip_desc *desc;
	struct fip_mac_desc *mp;
	struct fip_wwn_desc *wp;
	struct fip_vn_desc *vp;
	size_t rlen;
	size_t dlen;
	struct fcoe_fcf *fcf = fip->sel_fcf;
954
	struct fc_lport *lport = fip->lp;
955 956
	u32	desc_mask;

957
	LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
958

959
	if (!fcf || !lport->port_id)
960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994
		return;

	/*
	 * mask of required descriptors.  Validating each one clears its bit.
	 */
	desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID);

	rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
	desc = (struct fip_desc *)(fh + 1);
	while (rlen >= sizeof(*desc)) {
		dlen = desc->fip_dlen * FIP_BPW;
		if (dlen > rlen)
			return;
		switch (desc->fip_dtype) {
		case FIP_DT_MAC:
			mp = (struct fip_mac_desc *)desc;
			if (dlen < sizeof(*mp))
				return;
			if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac))
				return;
			desc_mask &= ~BIT(FIP_DT_MAC);
			break;
		case FIP_DT_NAME:
			wp = (struct fip_wwn_desc *)desc;
			if (dlen < sizeof(*wp))
				return;
			if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
				return;
			desc_mask &= ~BIT(FIP_DT_NAME);
			break;
		case FIP_DT_VN_ID:
			vp = (struct fip_vn_desc *)desc;
			if (dlen < sizeof(*vp))
				return;
			if (compare_ether_addr(vp->fd_mac,
995 996
					       fip->get_src_addr(lport)) == 0 &&
			    get_unaligned_be64(&vp->fd_wwpn) == lport->wwpn &&
997
			    ntoh24(vp->fd_fc_id) == lport->port_id)
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
				desc_mask &= ~BIT(FIP_DT_VN_ID);
			break;
		default:
			/* standard says ignore unknown descriptors >= 128 */
			if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
				return;
			break;
		}
		desc = (struct fip_desc *)((char *)desc + dlen);
		rlen -= dlen;
	}

	/*
	 * reset only if all required descriptors were present and valid.
	 */
	if (desc_mask) {
1014 1015
		LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
				desc_mask);
1016
	} else {
1017
		LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1018 1019

		spin_lock_bh(&fip->lock);
1020 1021
		per_cpu_ptr(lport->dev_stats,
			    smp_processor_id())->VLinkFailureCount++;
1022 1023 1024 1025 1026
		fcoe_ctlr_reset(fip);
		spin_unlock_bh(&fip->lock);

		fc_lport_reset(fip->lp);
		fcoe_ctlr_solicit(fip, NULL);
1027 1028 1029 1030
	}
}

/**
1031 1032 1033
 * fcoe_ctlr_recv() - Receive a FIP packet
 * @fip: The FCoE controller that received the packet
 * @skb: The received FIP packet
1034
 *
1035
 * This may be called from either NET_RX_SOFTIRQ or IRQ.
1036 1037 1038
 */
void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
1039
	skb_queue_tail(&fip->fip_recv_list, skb);
1040 1041 1042 1043 1044
	schedule_work(&fip->recv_work);
}
EXPORT_SYMBOL(fcoe_ctlr_recv);

/**
1045 1046 1047
 * fcoe_ctlr_recv_handler() - Receive a FIP frame
 * @fip: The FCoE controller that received the frame
 * @skb: The received FIP frame
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
 *
 * Returns non-zero if the frame is dropped.
 */
static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
	struct fip_header *fiph;
	struct ethhdr *eh;
	enum fip_state state;
	u16 op;
	u8 sub;

	if (skb_linearize(skb))
		goto drop;
	if (skb->len < sizeof(*fiph))
		goto drop;
	eh = eth_hdr(skb);
	if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) &&
	    compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS))
		goto drop;
	fiph = (struct fip_header *)skb->data;
	op = ntohs(fiph->fip_op);
	sub = fiph->fip_subcode;

	if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
		goto drop;
	if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
		goto drop;

	spin_lock_bh(&fip->lock);
	state = fip->state;
	if (state == FIP_ST_AUTO) {
		fip->map_dest = 0;
		fip->state = FIP_ST_ENABLED;
		state = FIP_ST_ENABLED;
1082
		LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
	}
	spin_unlock_bh(&fip->lock);
	if (state != FIP_ST_ENABLED)
		goto drop;

	if (op == FIP_OP_LS) {
		fcoe_ctlr_recv_els(fip, skb);	/* consumes skb */
		return 0;
	}
	if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
		fcoe_ctlr_recv_adv(fip, skb);
	else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
		fcoe_ctlr_recv_clr_vlink(fip, fiph);
	kfree_skb(skb);
	return 0;
drop:
	kfree_skb(skb);
	return -1;
}

/**
1104 1105
 * fcoe_ctlr_select() - Select the best FCF (if possible)
 * @fip: The FCoE controller
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
 *
 * If there are conflicting advertisements, no FCF can be chosen.
 *
 * Called with lock held.
 */
static void fcoe_ctlr_select(struct fcoe_ctlr *fip)
{
	struct fcoe_fcf *fcf;
	struct fcoe_fcf *best = NULL;

	list_for_each_entry(fcf, &fip->fcfs, list) {
1117 1118 1119
		LIBFCOE_FIP_DBG(fip, "consider FCF for fab %16.16llx "
				"VFID %d map %x val %d\n",
				fcf->fabric_name, fcf->vfid,
1120
				fcf->fc_map, fcoe_ctlr_mtu_valid(fcf));
1121
		if (!fcoe_ctlr_fcf_usable(fcf)) {
1122 1123 1124 1125 1126 1127
			LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
					"map %x %svalid %savailable\n",
					fcf->fabric_name, fcf->fc_map,
					(fcf->flags & FIP_FL_SOL) ? "" : "in",
					(fcf->flags & FIP_FL_AVAIL) ?
					"" : "un");
1128 1129 1130 1131 1132 1133 1134 1135 1136
			continue;
		}
		if (!best) {
			best = fcf;
			continue;
		}
		if (fcf->fabric_name != best->fabric_name ||
		    fcf->vfid != best->vfid ||
		    fcf->fc_map != best->fc_map) {
1137
			LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1138
					"or FC-MAP\n");
1139 1140 1141 1142 1143 1144 1145 1146 1147
			return;
		}
		if (fcf->pri < best->pri)
			best = fcf;
	}
	fip->sel_fcf = best;
}

/**
1148 1149
 * fcoe_ctlr_timeout() - FIP timeout handler
 * @arg: The FCoE controller that timed out
1150 1151 1152 1153 1154 1155 1156 1157
 *
 * Ages FCFs.  Triggers FCF selection if possible.  Sends keep-alives.
 */
static void fcoe_ctlr_timeout(unsigned long arg)
{
	struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
	struct fcoe_fcf *sel;
	struct fcoe_fcf *fcf;
1158
	unsigned long next_timer;
1159 1160 1161 1162 1163 1164 1165 1166

	spin_lock_bh(&fip->lock);
	if (fip->state == FIP_ST_DISABLED) {
		spin_unlock_bh(&fip->lock);
		return;
	}

	fcf = fip->sel_fcf;
1167
	next_timer = fcoe_ctlr_age_fcfs(fip);
1168 1169

	sel = fip->sel_fcf;
1170 1171 1172 1173 1174 1175 1176
	if (!sel && fip->sel_time) {
		if (time_after_eq(jiffies, fip->sel_time)) {
			fcoe_ctlr_select(fip);
			sel = fip->sel_fcf;
			fip->sel_time = 0;
		} else if (time_after(next_timer, fip->sel_time))
			next_timer = fip->sel_time;
1177 1178 1179 1180 1181
	}

	if (sel != fcf) {
		fcf = sel;		/* the old FCF may have been freed */
		if (sel) {
1182
			printk(KERN_INFO "libfcoe: host%d: FIP selected "
1183 1184
			       "Fibre-Channel Forwarder MAC %pM\n",
			       fip->lp->host->host_no, sel->fcf_mac);
1185 1186
			memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN);
			fip->port_ka_time = jiffies +
1187
				msecs_to_jiffies(FIP_VN_KA_PERIOD);
1188
			fip->ctlr_ka_time = jiffies + sel->fka_period;
1189 1190
			if (time_after(next_timer, fip->ctlr_ka_time))
				next_timer = fip->ctlr_ka_time;
1191
		} else {
1192
			printk(KERN_NOTICE "libfcoe: host%d: "
1193
			       "FIP Fibre-Channel Forwarder timed out.	"
1194 1195
			       "Starting FCF discovery.\n",
			       fip->lp->host->host_no);
1196
			fip->reset_req = 1;
1197
			schedule_work(&fip->timer_work);
1198 1199 1200
		}
	}

1201
	if (sel && !sel->fd_flags) {
1202 1203
		if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
			fip->ctlr_ka_time = jiffies + sel->fka_period;
1204
			fip->send_ctlr_ka = 1;
1205 1206 1207 1208 1209
		}
		if (time_after(next_timer, fip->ctlr_ka_time))
			next_timer = fip->ctlr_ka_time;

		if (time_after_eq(jiffies, fip->port_ka_time)) {
1210
			fip->port_ka_time = jiffies +
1211
				msecs_to_jiffies(FIP_VN_KA_PERIOD);
1212
			fip->send_port_ka = 1;
1213 1214 1215 1216
		}
		if (time_after(next_timer, fip->port_ka_time))
			next_timer = fip->port_ka_time;
	}
1217 1218
	if (!list_empty(&fip->fcfs))
		mod_timer(&fip->timer, next_timer);
1219
	if (fip->send_ctlr_ka || fip->send_port_ka)
1220
		schedule_work(&fip->timer_work);
1221 1222 1223 1224
	spin_unlock_bh(&fip->lock);
}

/**
1225
 * fcoe_ctlr_timer_work() - Worker thread function for timer work
1226
 * @work: Handle to a FCoE controller
1227
 *
1228
 * Sends keep-alives and resets which must not
1229 1230
 * be called from the timer directly, since they use a mutex.
 */
1231
static void fcoe_ctlr_timer_work(struct work_struct *work)
1232 1233
{
	struct fcoe_ctlr *fip;
1234 1235
	struct fc_lport *vport;
	u8 *mac;
1236
	int reset;
1237

1238
	fip = container_of(work, struct fcoe_ctlr, timer_work);
1239
	spin_lock_bh(&fip->lock);
1240 1241
	reset = fip->reset_req;
	fip->reset_req = 0;
1242 1243
	spin_unlock_bh(&fip->lock);

1244
	if (reset) {
1245
		fc_lport_reset(fip->lp);
1246 1247 1248
		/* restart things with a solicitation */
		fcoe_ctlr_solicit(fip, NULL);
	}
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264

	if (fip->send_ctlr_ka) {
		fip->send_ctlr_ka = 0;
		fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
	}
	if (fip->send_port_ka) {
		fip->send_port_ka = 0;
		mutex_lock(&fip->lp->lp_mutex);
		mac = fip->get_src_addr(fip->lp);
		fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
		list_for_each_entry(vport, &fip->lp->vports, list) {
			mac = fip->get_src_addr(vport);
			fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
		}
		mutex_unlock(&fip->lp->lp_mutex);
	}
1265 1266 1267
}

/**
1268 1269
 * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
 * @recv_work: Handle to a FCoE controller
1270 1271 1272 1273 1274 1275 1276
 */
static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
{
	struct fcoe_ctlr *fip;
	struct sk_buff *skb;

	fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1277
	while ((skb = skb_dequeue(&fip->fip_recv_list)))
1278 1279 1280 1281
		fcoe_ctlr_recv_handler(fip, skb);
}

/**
1282
 * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1283 1284
 * @fip: The FCoE controller
 * @fp:	 The FC frame to snoop
1285 1286 1287 1288 1289 1290 1291
 *
 * Snoop potential response to FLOGI or even incoming FLOGI.
 *
 * The caller has checked that we are waiting for login as indicated
 * by fip->flogi_oxid != FC_XID_UNKNOWN.
 *
 * The caller is responsible for freeing the frame.
1292
 * Fill in the granted_mac address.
1293 1294 1295
 *
 * Return non-zero if the frame should not be delivered to libfc.
 */
1296
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1297
			 struct fc_frame *fp)
1298 1299 1300
{
	struct fc_frame_header *fh;
	u8 op;
1301
	u8 *sa;
1302

1303
	sa = eth_hdr(&fp->skb)->h_source;
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
	fh = fc_frame_header_get(fp);
	if (fh->fh_type != FC_TYPE_ELS)
		return 0;

	op = fc_frame_payload_op(fp);
	if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
	    fip->flogi_oxid == ntohs(fh->fh_ox_id)) {

		spin_lock_bh(&fip->lock);
		if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
			spin_unlock_bh(&fip->lock);
			return -EINVAL;
		}
		fip->state = FIP_ST_NON_FIP;
1318 1319
		LIBFCOE_FIP_DBG(fip,
				"received FLOGI LS_ACC using non-FIP mode\n");
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334

		/*
		 * FLOGI accepted.
		 * If the src mac addr is FC_OUI-based, then we mark the
		 * address_mode flag to use FC_OUI-based Ethernet DA.
		 * Otherwise we use the FCoE gateway addr
		 */
		if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
			fip->map_dest = 1;
		} else {
			memcpy(fip->dest_addr, sa, ETH_ALEN);
			fip->map_dest = 0;
		}
		fip->flogi_oxid = FC_XID_UNKNOWN;
		spin_unlock_bh(&fip->lock);
1335
		fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1336 1337 1338 1339 1340 1341 1342 1343
	} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
		/*
		 * Save source MAC for point-to-point responses.
		 */
		spin_lock_bh(&fip->lock);
		if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
			memcpy(fip->dest_addr, sa, ETH_ALEN);
			fip->map_dest = 0;
1344 1345 1346
			if (fip->state == FIP_ST_AUTO)
				LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
						"Setting non-FIP mode\n");
1347 1348 1349 1350 1351 1352 1353 1354
			fip->state = FIP_ST_NON_FIP;
		}
		spin_unlock_bh(&fip->lock);
	}
	return 0;
}
EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);

1355
/**
1356 1357 1358 1359
 * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
 * @mac:    The MAC address to convert
 * @scheme: The scheme to use when converting
 * @port:   The port indicator for converting
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
 *
 * Returns: u64 fc world wide name
 */
u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
		      unsigned int scheme, unsigned int port)
{
	u64 wwn;
	u64 host_mac;

	/* The MAC is in NO, so flip only the low 48 bits */
	host_mac = ((u64) mac[0] << 40) |
		((u64) mac[1] << 32) |
		((u64) mac[2] << 24) |
		((u64) mac[3] << 16) |
		((u64) mac[4] << 8) |
		(u64) mac[5];

	WARN_ON(host_mac >= (1ULL << 48));
	wwn = host_mac | ((u64) scheme << 60);
	switch (scheme) {
	case 1:
		WARN_ON(port != 0);
		break;
	case 2:
		WARN_ON(port >= 0xfff);
		wwn |= (u64) port << 48;
		break;
	default:
		WARN_ON(1);
		break;
	}

	return wwn;
}
EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);

/**
1397 1398 1399
 * fcoe_libfc_config() - Sets up libfc related properties for local port
 * @lp: The local port to configure libfc for
 * @tt: The libfc function template
1400 1401 1402
 *
 * Returns : 0 for success
 */
1403 1404
int fcoe_libfc_config(struct fc_lport *lport,
		      struct libfc_function_template *tt)
1405 1406
{
	/* Set the function pointers set by the LLDD */
1407 1408
	memcpy(&lport->tt, tt, sizeof(*tt));
	if (fc_fcp_init(lport))
1409
		return -ENOMEM;
1410 1411 1412 1413 1414
	fc_exch_init(lport);
	fc_elsct_init(lport);
	fc_lport_init(lport);
	fc_rport_init(lport);
	fc_disc_init(lport);
1415 1416 1417 1418

	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_libfc_config);
1419
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