libfcoe.c 35.9 KB
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/*
 * 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
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/kthread.h>
#include <linux/crc32.h>
#include <linux/cpu.h>
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <net/rtnetlink.h>

#include <scsi/fc/fc_encaps.h>

#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include <scsi/libfcoe.h>
#include <scsi/fc_transport_fcoe.h>

static int debug_fcoe;

#define FCOE_MAX_QUEUE_DEPTH  256

/* destination address mode */
#define FCOE_GW_ADDR_MODE	    0x00
#define FCOE_FCOUI_ADDR_MODE	    0x01

#define FCOE_WORD_TO_BYTE  4

MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FCoE");
MODULE_LICENSE("GPL");

/* fcoe host list */
LIST_HEAD(fcoe_hostlist);
DEFINE_RWLOCK(fcoe_hostlist_lock);
DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
struct fcoe_percpu_s *fcoe_percpu[NR_CPUS];


/* Function Prototyes */
static int fcoe_check_wait_queue(struct fc_lport *);
static void fcoe_insert_wait_queue_head(struct fc_lport *, struct sk_buff *);
static void fcoe_insert_wait_queue(struct fc_lport *, struct sk_buff *);
static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
#ifdef CONFIG_HOTPLUG_CPU
static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
#endif /* CONFIG_HOTPLUG_CPU */
static int fcoe_device_notification(struct notifier_block *, ulong, void *);
static void fcoe_dev_setup(void);
static void fcoe_dev_cleanup(void);

/* notification function from net device */
static struct notifier_block fcoe_notifier = {
	.notifier_call = fcoe_device_notification,
};


#ifdef CONFIG_HOTPLUG_CPU
static struct notifier_block fcoe_cpu_notifier = {
	.notifier_call = fcoe_cpu_callback,
};

/**
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 * fcoe_create_percpu_data() - creates the associated cpu data
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 * @cpu: index for the cpu where fcoe cpu data will be created
 *
 * create percpu stats block, from cpu add notifier
 *
 * Returns: none
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 */
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static void fcoe_create_percpu_data(int cpu)
{
	struct fc_lport *lp;
	struct fcoe_softc *fc;

	write_lock_bh(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		lp = fc->lp;
		if (lp->dev_stats[cpu] == NULL)
			lp->dev_stats[cpu] =
				kzalloc(sizeof(struct fcoe_dev_stats),
					GFP_KERNEL);
	}
	write_unlock_bh(&fcoe_hostlist_lock);
}

/**
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 * fcoe_destroy_percpu_data() - destroys the associated cpu data
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 * @cpu: index for the cpu where fcoe cpu data will destroyed
 *
 * destroy percpu stats block called by cpu add/remove notifier
 *
 * Retuns: none
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 */
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static void fcoe_destroy_percpu_data(int cpu)
{
	struct fc_lport *lp;
	struct fcoe_softc *fc;

	write_lock_bh(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		lp = fc->lp;
		kfree(lp->dev_stats[cpu]);
		lp->dev_stats[cpu] = NULL;
	}
	write_unlock_bh(&fcoe_hostlist_lock);
}

/**
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 * fcoe_cpu_callback() - fcoe cpu hotplug event callback
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 * @nfb: callback data block
 * @action: event triggering the callback
 * @hcpu: index for the cpu of this event
 *
 * this creates or destroys per cpu data for fcoe
 *
 * Returns NOTIFY_OK always.
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 */
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static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action,
			     void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;

	switch (action) {
	case CPU_ONLINE:
		fcoe_create_percpu_data(cpu);
		break;
	case CPU_DEAD:
		fcoe_destroy_percpu_data(cpu);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}
#endif /* CONFIG_HOTPLUG_CPU */

/**
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 * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
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 * @skb: the receive skb
 * @dev: associated net device
 * @ptype: context
 * @odldev: last device
 *
 * this function will receive the packet and build fc frame and pass it up
 *
 * Returns: 0 for success
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 */
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int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
	     struct packet_type *ptype, struct net_device *olddev)
{
	struct fc_lport *lp;
	struct fcoe_rcv_info *fr;
	struct fcoe_softc *fc;
	struct fcoe_dev_stats *stats;
	struct fc_frame_header *fh;
	unsigned short oxid;
	int cpu_idx;
	struct fcoe_percpu_s *fps;

	fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
	lp = fc->lp;
	if (unlikely(lp == NULL)) {
		FC_DBG("cannot find hba structure");
		goto err2;
	}

	if (unlikely(debug_fcoe)) {
		FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
		       "end:%p sum:%d dev:%s", skb->len, skb->data_len,
		       skb->head, skb->data, skb_tail_pointer(skb),
		       skb_end_pointer(skb), skb->csum,
		       skb->dev ? skb->dev->name : "<NULL>");

	}

	/* check for FCOE packet type */
	if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
		FC_DBG("wrong FC type frame");
		goto err;
	}

	/*
	 * Check for minimum frame length, and make sure required FCoE
	 * and FC headers are pulled into the linear data area.
	 */
	if (unlikely((skb->len < FCOE_MIN_FRAME) ||
	    !pskb_may_pull(skb, FCOE_HEADER_LEN)))
		goto err;

	skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
	fh = (struct fc_frame_header *) skb_transport_header(skb);

	oxid = ntohs(fh->fh_ox_id);

	fr = fcoe_dev_from_skb(skb);
	fr->fr_dev = lp;
	fr->ptype = ptype;
	cpu_idx = 0;
#ifdef CONFIG_SMP
	/*
	 * The incoming frame exchange id(oxid) is ANDed with num of online
	 * cpu bits to get cpu_idx and then this cpu_idx is used for selecting
	 * a per cpu kernel thread from fcoe_percpu. In case the cpu is
	 * offline or no kernel thread for derived cpu_idx then cpu_idx is
	 * initialize to first online cpu index.
	 */
	cpu_idx = oxid & (num_online_cpus() - 1);
	if (!fcoe_percpu[cpu_idx] || !cpu_online(cpu_idx))
		cpu_idx = first_cpu(cpu_online_map);
#endif
	fps = fcoe_percpu[cpu_idx];

	spin_lock_bh(&fps->fcoe_rx_list.lock);
	__skb_queue_tail(&fps->fcoe_rx_list, skb);
	if (fps->fcoe_rx_list.qlen == 1)
		wake_up_process(fps->thread);

	spin_unlock_bh(&fps->fcoe_rx_list.lock);

	return 0;
err:
#ifdef CONFIG_SMP
	stats = lp->dev_stats[smp_processor_id()];
#else
	stats = lp->dev_stats[0];
#endif
	if (stats)
		stats->ErrorFrames++;

err2:
	kfree_skb(skb);
	return -1;
}
EXPORT_SYMBOL_GPL(fcoe_rcv);

/**
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 * fcoe_start_io() - pass to netdev to start xmit for fcoe
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 * @skb: the skb to be xmitted
 *
 * Returns: 0 for success
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 */
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static inline int fcoe_start_io(struct sk_buff *skb)
{
	int rc;

	skb_get(skb);
	rc = dev_queue_xmit(skb);
	if (rc != 0)
		return rc;
	kfree_skb(skb);
	return 0;
}

/**
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 * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof
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 * @skb: the skb to be xmitted
 * @tlen: total len
 *
 * Returns: 0 for success
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 */
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static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
{
	struct fcoe_percpu_s *fps;
	struct page *page;
	int cpu_idx;

	cpu_idx = get_cpu();
	fps = fcoe_percpu[cpu_idx];
	page = fps->crc_eof_page;
	if (!page) {
		page = alloc_page(GFP_ATOMIC);
		if (!page) {
			put_cpu();
			return -ENOMEM;
		}
		fps->crc_eof_page = page;
		WARN_ON(fps->crc_eof_offset != 0);
	}

	get_page(page);
	skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
			   fps->crc_eof_offset, tlen);
	skb->len += tlen;
	skb->data_len += tlen;
	skb->truesize += tlen;
	fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);

	if (fps->crc_eof_offset >= PAGE_SIZE) {
		fps->crc_eof_page = NULL;
		fps->crc_eof_offset = 0;
		put_page(page);
	}
	put_cpu();
	return 0;
}

/**
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 * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
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 * @fp: the fc_frame containg data to be checksummed
 *
 * This uses crc32() to calculate the crc for fc frame
 * Return   : 32 bit crc
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 */
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u32 fcoe_fc_crc(struct fc_frame *fp)
{
	struct sk_buff *skb = fp_skb(fp);
	struct skb_frag_struct *frag;
	unsigned char *data;
	unsigned long off, len, clen;
	u32 crc;
	unsigned i;

	crc = crc32(~0, skb->data, skb_headlen(skb));

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
		frag = &skb_shinfo(skb)->frags[i];
		off = frag->page_offset;
		len = frag->size;
		while (len > 0) {
			clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
			data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
					   KM_SKB_DATA_SOFTIRQ);
			crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
			kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
			off += clen;
			len -= clen;
		}
	}
	return crc;
}
EXPORT_SYMBOL_GPL(fcoe_fc_crc);

/**
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 * fcoe_xmit() - FCoE frame transmit function
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 * @lp:	the associated local port
 * @fp: the fc_frame to be transmitted
 *
 * Return   : 0 for success
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 */
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int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
{
	int wlen, rc = 0;
	u32 crc;
	struct ethhdr *eh;
	struct fcoe_crc_eof *cp;
	struct sk_buff *skb;
	struct fcoe_dev_stats *stats;
	struct fc_frame_header *fh;
	unsigned int hlen;		/* header length implies the version */
	unsigned int tlen;		/* trailer length */
	unsigned int elen;		/* eth header, may include vlan */
	int flogi_in_progress = 0;
	struct fcoe_softc *fc;
	u8 sof, eof;
	struct fcoe_hdr *hp;

	WARN_ON((fr_len(fp) % sizeof(u32)) != 0);

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	fc = lport_priv(lp);
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	/*
	 * if it is a flogi then we need to learn gw-addr
	 * and my own fcid
	 */
	fh = fc_frame_header_get(fp);
	if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
		if (fc_frame_payload_op(fp) == ELS_FLOGI) {
			fc->flogi_oxid = ntohs(fh->fh_ox_id);
			fc->address_mode = FCOE_FCOUI_ADDR_MODE;
			fc->flogi_progress = 1;
			flogi_in_progress = 1;
		} else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 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.
			 */
			fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
			fc->flogi_progress = 0;
		}
	}

	skb = fp_skb(fp);
	sof = fr_sof(fp);
	eof = fr_eof(fp);

	elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
		sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr);
	hlen = sizeof(struct fcoe_hdr);
	tlen = sizeof(struct fcoe_crc_eof);
	wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;

	/* crc offload */
	if (likely(lp->crc_offload)) {
		skb->ip_summed = CHECKSUM_COMPLETE;
		skb->csum_start = skb_headroom(skb);
		skb->csum_offset = skb->len;
		crc = 0;
	} else {
		skb->ip_summed = CHECKSUM_NONE;
		crc = fcoe_fc_crc(fp);
	}

	/* copy fc crc and eof to the skb buff */
	if (skb_is_nonlinear(skb)) {
		skb_frag_t *frag;
		if (fcoe_get_paged_crc_eof(skb, tlen)) {
			kfree(skb);
			return -ENOMEM;
		}
		frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
		cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
			+ frag->page_offset;
	} else {
		cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
	}

	memset(cp, 0, sizeof(*cp));
	cp->fcoe_eof = eof;
	cp->fcoe_crc32 = cpu_to_le32(~crc);

	if (skb_is_nonlinear(skb)) {
		kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
		cp = NULL;
	}

	/* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
	skb_push(skb, elen + hlen);
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	skb->mac_len = elen;
	skb->protocol = htons(ETH_P_802_3);
	skb->dev = fc->real_dev;

	/* fill up mac and fcoe headers */
	eh = eth_hdr(skb);
	eh->h_proto = htons(ETH_P_FCOE);
	if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
		fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
	else
		/* insert GW address */
		memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);

	if (unlikely(flogi_in_progress))
		memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
	else
		memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);

	hp = (struct fcoe_hdr *)(eh + 1);
	memset(hp, 0, sizeof(*hp));
	if (FC_FCOE_VER)
		FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
	hp->fcoe_sof = sof;

	/* update tx stats: regardless if LLD fails */
	stats = lp->dev_stats[smp_processor_id()];
	if (stats) {
		stats->TxFrames++;
		stats->TxWords += wlen;
	}

	/* send down to lld */
	fr_dev(fp) = lp;
	if (fc->fcoe_pending_queue.qlen)
		rc = fcoe_check_wait_queue(lp);

	if (rc == 0)
		rc = fcoe_start_io(skb);

	if (rc) {
		fcoe_insert_wait_queue(lp, skb);
		if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
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			lp->qfull = 1;
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	}

	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_xmit);

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/**
 * fcoe_percpu_receive_thread() - recv thread per cpu
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 * @arg: ptr to the fcoe per cpu struct
 *
 * Return: 0 for success
 */
int fcoe_percpu_receive_thread(void *arg)
{
	struct fcoe_percpu_s *p = arg;
	u32 fr_len;
	struct fc_lport *lp;
	struct fcoe_rcv_info *fr;
	struct fcoe_dev_stats *stats;
	struct fc_frame_header *fh;
	struct sk_buff *skb;
	struct fcoe_crc_eof crc_eof;
	struct fc_frame *fp;
	u8 *mac = NULL;
	struct fcoe_softc *fc;
	struct fcoe_hdr *hp;

	set_user_nice(current, 19);

	while (!kthread_should_stop()) {

		spin_lock_bh(&p->fcoe_rx_list.lock);
		while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
			set_current_state(TASK_INTERRUPTIBLE);
			spin_unlock_bh(&p->fcoe_rx_list.lock);
			schedule();
			set_current_state(TASK_RUNNING);
			if (kthread_should_stop())
				return 0;
			spin_lock_bh(&p->fcoe_rx_list.lock);
		}
		spin_unlock_bh(&p->fcoe_rx_list.lock);
		fr = fcoe_dev_from_skb(skb);
		lp = fr->fr_dev;
		if (unlikely(lp == NULL)) {
			FC_DBG("invalid HBA Structure");
			kfree_skb(skb);
			continue;
		}

		stats = lp->dev_stats[smp_processor_id()];

		if (unlikely(debug_fcoe)) {
			FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
			       "tail:%p end:%p sum:%d dev:%s",
			       skb->len, skb->data_len,
			       skb->head, skb->data, skb_tail_pointer(skb),
			       skb_end_pointer(skb), skb->csum,
			       skb->dev ? skb->dev->name : "<NULL>");
		}

		/*
		 * Save source MAC address before discarding header.
		 */
		fc = lport_priv(lp);
		if (unlikely(fc->flogi_progress))
			mac = eth_hdr(skb)->h_source;

		if (skb_is_nonlinear(skb))
			skb_linearize(skb);	/* not ideal */

		/*
		 * Frame length checks and setting up the header pointers
		 * was done in fcoe_rcv already.
		 */
		hp = (struct fcoe_hdr *) skb_network_header(skb);
		fh = (struct fc_frame_header *) skb_transport_header(skb);

		if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
			if (stats) {
				if (stats->ErrorFrames < 5)
					FC_DBG("unknown FCoE version %x",
					       FC_FCOE_DECAPS_VER(hp));
				stats->ErrorFrames++;
			}
			kfree_skb(skb);
			continue;
		}

		skb_pull(skb, sizeof(struct fcoe_hdr));
		fr_len = skb->len - sizeof(struct fcoe_crc_eof);

		if (stats) {
			stats->RxFrames++;
			stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
		}

		fp = (struct fc_frame *)skb;
		fc_frame_init(fp);
		fr_dev(fp) = lp;
		fr_sof(fp) = hp->fcoe_sof;

		/* Copy out the CRC and EOF trailer for access */
		if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
			kfree_skb(skb);
			continue;
		}
		fr_eof(fp) = crc_eof.fcoe_eof;
		fr_crc(fp) = crc_eof.fcoe_crc32;
		if (pskb_trim(skb, fr_len)) {
			kfree_skb(skb);
			continue;
		}

		/*
		 * We only check CRC if no offload is available and if it is
		 * it's solicited data, in which case, the FCP layer would
		 * check it during the copy.
		 */
		if (lp->crc_offload)
			fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
		else
			fr_flags(fp) |= FCPHF_CRC_UNCHECKED;

		fh = fc_frame_header_get(fp);
		if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
		    fh->fh_type == FC_TYPE_FCP) {
			fc_exch_recv(lp, lp->emp, fp);
			continue;
		}
		if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
			if (le32_to_cpu(fr_crc(fp)) !=
			    ~crc32(~0, skb->data, fr_len)) {
				if (debug_fcoe || stats->InvalidCRCCount < 5)
					printk(KERN_WARNING "fcoe: dropping "
					       "frame with CRC error\n");
				stats->InvalidCRCCount++;
				stats->ErrorFrames++;
				fc_frame_free(fp);
				continue;
			}
			fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
		}
		/* non flogi and non data exchanges are handled here */
		if (unlikely(fc->flogi_progress))
			fcoe_recv_flogi(fc, fp, mac);
		fc_exch_recv(lp, lp->emp, fp);
	}
	return 0;
}

/**
658
 * fcoe_recv_flogi() - flogi receive function
659
660
661
662
663
664
665
666
 * @fc: associated fcoe_softc
 * @fp: the recieved frame
 * @sa: the source address of this flogi
 *
 * This is responsible to parse the flogi response and sets the corresponding
 * mac address for the initiator, eitehr OUI based or GW based.
 *
 * Returns: none
667
 */
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
{
	struct fc_frame_header *fh;
	u8 op;

	fh = fc_frame_header_get(fp);
	if (fh->fh_type != FC_TYPE_ELS)
		return;
	op = fc_frame_payload_op(fp);
	if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
	    fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
		/*
		 * 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)) {
			fc->address_mode = FCOE_FCOUI_ADDR_MODE;
		} else {
			memcpy(fc->dest_addr, sa, ETH_ALEN);
			fc->address_mode = FCOE_GW_ADDR_MODE;
		}

		/*
		 * Remove any previously-set unicast MAC filter.
		 * Add secondary FCoE MAC address filter for our OUI.
		 */
		rtnl_lock();
		if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
			dev_unicast_delete(fc->real_dev, fc->data_src_addr,
					   ETH_ALEN);
		fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
		dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
		rtnl_unlock();

		fc->flogi_progress = 0;
	} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
		/*
		 * Save source MAC for point-to-point responses.
		 */
		memcpy(fc->dest_addr, sa, ETH_ALEN);
		fc->address_mode = FCOE_GW_ADDR_MODE;
	}
}

/**
715
 * fcoe_watchdog() - fcoe timer callback
716
717
 * @vp:
 *
718
 * This checks the pending queue length for fcoe and set lport qfull
719
720
721
722
 * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
 * fcoe_hostlist.
 *
 * Returns: 0 for success
723
 */
724
725
726
727
void fcoe_watchdog(ulong vp)
{
	struct fc_lport *lp;
	struct fcoe_softc *fc;
728
	int qfilled = 0;
729
730
731
732
733
734

	read_lock(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		lp = fc->lp;
		if (lp) {
			if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
735
				qfilled = 1;
736
			if (fcoe_check_wait_queue(lp) <	 FCOE_MAX_QUEUE_DEPTH) {
737
738
				if (qfilled)
					lp->qfull = 0;
739
740
741
742
743
744
745
746
747
748
749
			}
		}
	}
	read_unlock(&fcoe_hostlist_lock);

	fcoe_timer.expires = jiffies + (1 * HZ);
	add_timer(&fcoe_timer);
}


/**
750
 * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue
751
752
753
754
755
756
757
758
759
760
761
762
763
 * @lp: the fc_port for this skb
 * @skb: the associated skb to be xmitted
 *
 * This empties the wait_queue, dequeue the head of the wait_queue queue
 * and calls fcoe_start_io() for each packet, if all skb have been
 * transmitted, return 0 if a error occurs, then restore wait_queue and
 * try again later.
 *
 * The wait_queue is used when the skb transmit fails. skb will go
 * in the wait_queue which will be emptied by the time function OR
 * by the next skb transmit.
 *
 * Returns: 0 for success
764
 */
765
766
static int fcoe_check_wait_queue(struct fc_lport *lp)
{
767
	int rc;
768
769
770
	struct sk_buff *skb;
	struct fcoe_softc *fc;

771
	fc = lport_priv(lp);
772
773
774
	spin_lock_bh(&fc->fcoe_pending_queue.lock);

	/*
775
	 * if interface pending queue full then set qfull in lport.
776
777
	 */
	if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
778
		lp->qfull = 1;
779
780
781
782
783
784
785
786
787
788
789
	if (fc->fcoe_pending_queue.qlen) {
		while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
			spin_unlock_bh(&fc->fcoe_pending_queue.lock);
			rc = fcoe_start_io(skb);
			if (rc) {
				fcoe_insert_wait_queue_head(lp, skb);
				return rc;
			}
			spin_lock_bh(&fc->fcoe_pending_queue.lock);
		}
		if (fc->fcoe_pending_queue.qlen < FCOE_MAX_QUEUE_DEPTH)
790
			lp->qfull = 0;
791
792
793
794
795
796
	}
	spin_unlock_bh(&fc->fcoe_pending_queue.lock);
	return fc->fcoe_pending_queue.qlen;
}

/**
797
 * fcoe_insert_wait_queue_head() - puts skb to fcoe pending queue head
798
799
800
801
 * @lp: the fc_port for this skb
 * @skb: the associated skb to be xmitted
 *
 * Returns: none
802
 */
803
804
805
806
807
static void fcoe_insert_wait_queue_head(struct fc_lport *lp,
					struct sk_buff *skb)
{
	struct fcoe_softc *fc;

808
	fc = lport_priv(lp);
809
810
811
812
813
814
	spin_lock_bh(&fc->fcoe_pending_queue.lock);
	__skb_queue_head(&fc->fcoe_pending_queue, skb);
	spin_unlock_bh(&fc->fcoe_pending_queue.lock);
}

/**
815
 * fcoe_insert_wait_queue() - put the skb into fcoe pending queue tail
816
817
818
819
 * @lp: the fc_port for this skb
 * @skb: the associated skb to be xmitted
 *
 * Returns: none
820
 */
821
822
823
824
825
static void fcoe_insert_wait_queue(struct fc_lport *lp,
				   struct sk_buff *skb)
{
	struct fcoe_softc *fc;

826
	fc = lport_priv(lp);
827
828
829
830
831
832
	spin_lock_bh(&fc->fcoe_pending_queue.lock);
	__skb_queue_tail(&fc->fcoe_pending_queue, skb);
	spin_unlock_bh(&fc->fcoe_pending_queue.lock);
}

/**
833
834
835
 * fcoe_dev_setup() - setup link change notification interface
 */
static void fcoe_dev_setup()
836
837
838
839
840
841
842
843
844
{
	/*
	 * here setup a interface specific wd time to
	 * monitor the link state
	 */
	register_netdevice_notifier(&fcoe_notifier);
}

/**
845
846
 * fcoe_dev_setup() - cleanup link change notification interface
 */
847
848
849
850
851
852
static void fcoe_dev_cleanup(void)
{
	unregister_netdevice_notifier(&fcoe_notifier);
}

/**
853
 * fcoe_device_notification() - netdev event notification callback
854
855
856
857
858
859
860
 * @notifier: context of the notification
 * @event: type of event
 * @ptr: fixed array for output parsed ifname
 *
 * This function is called by the ethernet driver in case of link change event
 *
 * Returns: 0 for success
861
 */
862
863
864
865
866
867
868
static int fcoe_device_notification(struct notifier_block *notifier,
				    ulong event, void *ptr)
{
	struct fc_lport *lp = NULL;
	struct net_device *real_dev = ptr;
	struct fcoe_softc *fc;
	struct fcoe_dev_stats *stats;
869
	u32 new_link_up;
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
	u32 mfs;
	int rc = NOTIFY_OK;

	read_lock(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		if (fc->real_dev == real_dev) {
			lp = fc->lp;
			break;
		}
	}
	read_unlock(&fcoe_hostlist_lock);
	if (lp == NULL) {
		rc = NOTIFY_DONE;
		goto out;
	}

886
	new_link_up = lp->link_up;
887
888
889
	switch (event) {
	case NETDEV_DOWN:
	case NETDEV_GOING_DOWN:
890
		new_link_up = 0;
891
892
893
		break;
	case NETDEV_UP:
	case NETDEV_CHANGE:
894
		new_link_up = !fcoe_link_ok(lp);
895
896
897
898
899
900
901
		break;
	case NETDEV_CHANGEMTU:
		mfs = fc->real_dev->mtu -
			(sizeof(struct fcoe_hdr) +
			 sizeof(struct fcoe_crc_eof));
		if (mfs >= FC_MIN_MAX_FRAME)
			fc_set_mfs(lp, mfs);
902
		new_link_up = !fcoe_link_ok(lp);
903
904
905
906
907
908
		break;
	case NETDEV_REGISTER:
		break;
	default:
		FC_DBG("unknown event %ld call", event);
	}
909
910
	if (lp->link_up != new_link_up) {
		if (new_link_up)
911
912
913
914
915
916
917
918
919
920
921
922
923
924
			fc_linkup(lp);
		else {
			stats = lp->dev_stats[smp_processor_id()];
			if (stats)
				stats->LinkFailureCount++;
			fc_linkdown(lp);
			fcoe_clean_pending_queue(lp);
		}
	}
out:
	return rc;
}

/**
925
 * fcoe_if_to_netdev() - parse a name buffer to get netdev
926
927
928
929
 * @ifname: fixed array for output parsed ifname
 * @buffer: incoming buffer to be copied
 *
 * Returns: NULL or ptr to netdeive
930
 */
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
static struct net_device *fcoe_if_to_netdev(const char *buffer)
{
	char *cp;
	char ifname[IFNAMSIZ + 2];

	if (buffer) {
		strlcpy(ifname, buffer, IFNAMSIZ);
		cp = ifname + strlen(ifname);
		while (--cp >= ifname && *cp == '\n')
			*cp = '\0';
		return dev_get_by_name(&init_net, ifname);
	}
	return NULL;
}

/**
947
 * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev
948
949
950
 * @netdev: the target netdev
 *
 * Returns: ptr to the struct module, NULL for failure
951
 */
952
953
static struct module *
fcoe_netdev_to_module_owner(const struct net_device *netdev)
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
{
	struct device *dev;

	if (!netdev)
		return NULL;

	dev = netdev->dev.parent;
	if (!dev)
		return NULL;

	if (!dev->driver)
		return NULL;

	return dev->driver->owner;
}

/**
971
 * fcoe_ethdrv_get() - Hold the Ethernet driver
972
973
 * @netdev: the target netdev
 *
974
975
976
 * Holds the Ethernet driver module by try_module_get() for
 * the corresponding netdev.
 *
977
 * Returns: 0 for succsss
978
 */
979
980
981
982
983
984
static int fcoe_ethdrv_get(const struct net_device *netdev)
{
	struct module *owner;

	owner = fcoe_netdev_to_module_owner(netdev);
	if (owner) {
985
986
		printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n",
		       module_name(owner), netdev->name);
987
988
989
990
991
992
		return  try_module_get(owner);
	}
	return -ENODEV;
}

/**
993
 * fcoe_ethdrv_put() - Release the Ethernet driver
994
995
 * @netdev: the target netdev
 *
996
997
998
 * Releases the Ethernet driver module by module_put for
 * the corresponding netdev.
 *
999
 * Returns: 0 for succsss
1000
 */
1001
1002
1003
1004
1005
1006
static int fcoe_ethdrv_put(const struct net_device *netdev)
{
	struct module *owner;

	owner = fcoe_netdev_to_module_owner(netdev);
	if (owner) {
1007
1008
		printk(KERN_DEBUG "fcoe:release driver module %s for %s\n",
		       module_name(owner), netdev->name);
1009
1010
1011
1012
1013
1014
1015
		module_put(owner);
		return 0;
	}
	return -ENODEV;
}

/**
1016
 * fcoe_destroy() - handles the destroy from sysfs
1017
1018
1019
1020
 * @buffer: expcted to be a eth if name
 * @kp: associated kernel param
 *
 * Returns: 0 for success
1021
 */
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
{
	int rc;
	struct net_device *netdev;

	netdev = fcoe_if_to_netdev(buffer);
	if (!netdev) {
		rc = -ENODEV;
		goto out_nodev;
	}
	/* look for existing lport */
	if (!fcoe_hostlist_lookup(netdev)) {
		rc = -ENODEV;
		goto out_putdev;
	}
	/* pass to transport */
	rc = fcoe_transport_release(netdev);
	if (rc) {
		printk(KERN_ERR "fcoe: fcoe_transport_release(%s) failed\n",
		       netdev->name);
		rc = -EIO;
		goto out_putdev;
	}
	fcoe_ethdrv_put(netdev);
	rc = 0;
out_putdev:
	dev_put(netdev);
out_nodev:
	return rc;
}

/**
1054
 * fcoe_create() - Handles the create call from sysfs
1055
1056
1057
1058
 * @buffer: expcted to be a eth if name
 * @kp: associated kernel param
 *
 * Returns: 0 for success
1059
 */
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
static int fcoe_create(const char *buffer, struct kernel_param *kp)
{
	int rc;
	struct net_device *netdev;

	netdev = fcoe_if_to_netdev(buffer);
	if (!netdev) {
		rc = -ENODEV;
		goto out_nodev;
	}
	/* look for existing lport */
	if (fcoe_hostlist_lookup(netdev)) {
		rc = -EEXIST;
		goto out_putdev;
	}
	fcoe_ethdrv_get(netdev);

	/* pass to transport */
	rc = fcoe_transport_attach(netdev);
	if (rc) {
		printk(KERN_ERR "fcoe: fcoe_transport_attach(%s) failed\n",
		       netdev->name);
		fcoe_ethdrv_put(netdev);
		rc = -EIO;
		goto out_putdev;
	}
	rc = 0;
out_putdev:
	dev_put(netdev);
out_nodev:
	return rc;
}

module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(create, "string");
MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(destroy, "string");
MODULE_PARM_DESC(destroy, "Destroy fcoe port");

1100
1101
/**
 * fcoe_link_ok() - Check if link is ok for the fc_lport
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
 * @lp: ptr to the fc_lport
 *
 * Any permanently-disqualifying conditions have been previously checked.
 * This also updates the speed setting, which may change with link for 100/1000.
 *
 * This function should probably be checking for PAUSE support at some point
 * in the future. Currently Per-priority-pause is not determinable using
 * ethtool, so we shouldn't be restrictive until that problem is resolved.
 *
 * Returns: 0 if link is OK for use by FCoE.
 *
 */
int fcoe_link_ok(struct fc_lport *lp)
{
1116
	struct fcoe_softc *fc = lport_priv(lp);
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
	struct net_device *dev = fc->real_dev;
	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	int rc = 0;

	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
		dev = fc->phys_dev;
		if (dev->ethtool_ops->get_settings) {
			dev->ethtool_ops->get_settings(dev, &ecmd);
			lp->link_supported_speeds &=
				~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
			if (ecmd.supported & (SUPPORTED_1000baseT_Half |
					      SUPPORTED_1000baseT_Full))
				lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
			if (ecmd.supported & SUPPORTED_10000baseT_Full)
				lp->link_supported_speeds |=
					FC_PORTSPEED_10GBIT;
			if (ecmd.speed == SPEED_1000)
				lp->link_speed = FC_PORTSPEED_1GBIT;
			if (ecmd.speed == SPEED_10000)
				lp->link_speed = FC_PORTSPEED_10GBIT;
		}
	} else
		rc = -1;

	return rc;
}
EXPORT_SYMBOL_GPL(fcoe_link_ok);

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/**
 * fcoe_percpu_clean() - Clear the pending skbs for an lport
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 * @lp: the fc_lport
 */
void fcoe_percpu_clean(struct fc_lport *lp)
{
	int idx;
	struct fcoe_percpu_s *pp;
	struct fcoe_rcv_info *fr;
	struct sk_buff_head *list;
	struct sk_buff *skb, *next;
	struct sk_buff *head;

	for (idx = 0; idx < NR_CPUS; idx++) {
		if (fcoe_percpu[idx]) {
			pp = fcoe_percpu[idx];
			spin_lock_bh(&pp->fcoe_rx_list.lock);
			list = &pp->fcoe_rx_list;
			head = list->next;
			for (skb = head; skb != (struct sk_buff *)list;
			     skb = next) {
				next = skb->next;
				fr = fcoe_dev_from_skb(skb);
				if (fr->fr_dev == lp) {
					__skb_unlink(skb, list);
					kfree_skb(skb);
				}
			}
			spin_unlock_bh(&pp->fcoe_rx_list.lock);
		}
	}
}
EXPORT_SYMBOL_GPL(fcoe_percpu_clean);

/**
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 * fcoe_clean_pending_queue() - Dequeue a skb and free it
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 * @lp: the corresponding fc_lport
 *
 * Returns: none
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 */
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void fcoe_clean_pending_queue(struct fc_lport *lp)
{
	struct fcoe_softc  *fc = lport_priv(lp);
	struct sk_buff *skb;

	spin_lock_bh(&fc->fcoe_pending_queue.lock);
	while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
		spin_unlock_bh(&fc->fcoe_pending_queue.lock);
		kfree_skb(skb);
		spin_lock_bh(&fc->fcoe_pending_queue.lock);
	}
	spin_unlock_bh(&fc->fcoe_pending_queue.lock);
}
EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);

/**
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 * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
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 * @sht: ptr to the scsi host templ
 * @priv_size: size of private data after fc_lport
 *
 * Returns: ptr to Scsi_Host
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 * TODO: to libfc?
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 */
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static inline struct Scsi_Host *
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
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{
	return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
}

/**
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 * fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc
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 * @sht: ptr to the scsi host templ
 * @priv_size: size of private data after fc_lport
 *
 * Returns: ptr to Scsi_Host
 */
struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
{
	return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
}
EXPORT_SYMBOL_GPL(fcoe_host_alloc);

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/**
 * fcoe_reset() - Resets the fcoe
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 * @shost: shost the reset is from
 *
 * Returns: always 0
 */
int fcoe_reset(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);
	fc_lport_reset(lport);
	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_reset);

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/**
 * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
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 * @mac: mac address
 * @scheme: check port
 * @port: port indicator for converting
 *
 * 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);
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/**
 * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
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 * @device: this is currently ptr to net_device
 *
 * Returns: NULL or the located fcoe_softc
 */
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static struct fcoe_softc *
fcoe_hostlist_lookup_softc(const struct net_device *dev)
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{
	struct fcoe_softc *fc;

	read_lock(&fcoe_hostlist_lock);
	list_for_each_entry(fc, &fcoe_hostlist, list) {
		if (fc->real_dev == dev) {
			read_unlock(&fcoe_hostlist_lock);
			return fc;
		}
	}
	read_unlock(&fcoe_hostlist_lock);
	return NULL;
}

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/**
 * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
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 * @netdev: ptr to net_device
 *
 * Returns: 0 for success
 */
struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
{
	struct fcoe_softc *fc;

	fc = fcoe_hostlist_lookup_softc(netdev);

	return (fc) ? fc->lp : NULL;
}
EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);

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/**
 * fcoe_hostlist_add() - Add a lport to lports list
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 * @lp: ptr to the fc_lport to badded
 *
 * Returns: 0 for success
 */
int fcoe_hostlist_add(const struct fc_lport *lp)
{
	struct fcoe_softc *fc;

	fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
	if (!fc) {
1332
		fc = lport_priv(lp);
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		write_lock_bh(&fcoe_hostlist_lock);
		list_add_tail(&fc->list, &fcoe_hostlist);
		write_unlock_bh(&fcoe_hostlist_lock);
	}
	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_hostlist_add);

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/**
 * fcoe_hostlist_remove() - remove a lport from lports list
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 * @lp: ptr to the fc_lport to badded
 *
 * Returns: 0 for success
 */
int fcoe_hostlist_remove(const struct fc_lport *lp)
{
	struct fcoe_softc *fc;

	fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
	BUG_ON(!fc);
	write_lock_bh(&fcoe_hostlist_lock);
	list_del(&fc->list);
	write_unlock_bh(&fcoe_hostlist_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);

/**
1362
 * fcoe_libfc_config() - sets up libfc related properties for lport
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 * @lp: ptr to the fc_lport
 * @tt: libfc function template
 *
 * Returns : 0 for success
1367
 */
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int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
{
	/* Set the function pointers set by the LLDD */
	memcpy(&lp->tt, tt, sizeof(*tt));
	if (fc_fcp_init(lp))
		return -ENOMEM;
	fc_exch_init(lp);
	fc_elsct_init(lp);
	fc_lport_init(lp);
	fc_rport_init(lp);
	fc_disc_init(lp);

	return 0;
}
EXPORT_SYMBOL_GPL(fcoe_libfc_config);

/**
1385
 * fcoe_init() - fcoe module loading initialization
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 *
 * Initialization routine
 * 1. Will create fc transport software structure
 * 2. initialize the link list of port information structure
 *
 * Returns 0 on success, negative on failure
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 */
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static int __init fcoe_init(void)
{
	int cpu;
	struct fcoe_percpu_s *p;


	INIT_LIST_HEAD(&fcoe_hostlist);
	rwlock_init(&fcoe_hostlist_lock);

#ifdef CONFIG_HOTPLUG_CPU
	register_cpu_notifier(&fcoe_cpu_notifier);
#endif /* CONFIG_HOTPLUG_CPU */

	/*
	 * initialize per CPU interrupt thread
	 */
	for_each_online_cpu(cpu) {
		p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL);
		if (p) {
			p->thread = kthread_create(fcoe_percpu_receive_thread,
						   (void *)p,
						   "fcoethread/%d", cpu);

			/*
			 * if there is no error then bind the thread to the cpu
			 * initialize the semaphore and skb queue head
			 */
			if (likely(!IS_ERR(p->thread))) {
				p->cpu = cpu;
				fcoe_percpu[cpu] = p;
				skb_queue_head_init(&p->fcoe_rx_list);
				kthread_bind(p->thread, cpu);
				wake_up_process(p->thread);
			} else {
				fcoe_percpu[cpu] = NULL;
				kfree(p);
			}
		}
	}

	/*
	 * setup link change notification
	 */
	fcoe_dev_setup();

	init_timer(&fcoe_timer);
	fcoe_timer.data = 0;
	fcoe_timer.function = fcoe_watchdog;
	fcoe_timer.expires = (jiffies + (10 * HZ));
	add_timer(&fcoe_timer);

	/* initiatlize the fcoe transport */
	fcoe_transport_init();

	fcoe_sw_init();

	return 0;
}
module_init(fcoe_init);

/**
1454
 * fcoe_exit() - fcoe module unloading cleanup
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 *
 * Returns 0 on success, negative on failure
1457
 */
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static void __exit fcoe_exit(void)
{
	u32 idx;
	struct fcoe_softc *fc, *tmp;
	struct fcoe_percpu_s *p;
	struct sk_buff *skb;

	/*
	 * Stop all call back interfaces
	 */
#ifdef CONFIG_HOTPLUG_CPU
	unregister_cpu_notifier(&fcoe_cpu_notifier);
#endif /* CONFIG_HOTPLUG_CPU */
	fcoe_dev_cleanup();

	/*
	 * stop timer
	 */
	del_timer_sync(&fcoe_timer);

1478
	/* releases the associated fcoe transport for each lport */
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	list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
		fcoe_transport_release(fc->real_dev);

	for (idx = 0; idx < NR_CPUS; idx++) {
		if (fcoe_percpu[idx]) {
			kthread_stop(fcoe_percpu[idx]->thread);
			p = fcoe_percpu[idx];
			spin_lock_bh(&p->fcoe_rx_list.lock);
			while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
				kfree_skb(skb);
			spin_unlock_bh(&p->fcoe_rx_list.lock);
			if (fcoe_percpu[idx]->crc_eof_page)
				put_page(fcoe_percpu[idx]->crc_eof_page);
			kfree(fcoe_percpu[idx]);
		}
	}

	/* remove sw trasnport */
	fcoe_sw_exit();

	/* detach the transport */
	fcoe_transport_exit();
}
module_exit(fcoe_exit);