/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/workqueue.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/fc_frame.h>
#include <scsi/libfc.h>
#include "fnic_io.h"
#include "fnic.h"
#include "fnic_fip.h"
#include "cq_enet_desc.h"
#include "cq_exch_desc.h"

static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
struct workqueue_struct *fnic_fip_queue;
struct workqueue_struct *fnic_event_queue;

static void fnic_set_eth_mode(struct fnic *);
static void fnic_fcoe_send_vlan_req(struct fnic *fnic);
static void fnic_fcoe_start_fcf_disc(struct fnic *fnic);
static void fnic_fcoe_process_vlan_resp(struct fnic *fnic, struct sk_buff *);
static int fnic_fcoe_vlan_check(struct fnic *fnic, u16 flag);
static int fnic_fcoe_handle_fip_frame(struct fnic *fnic, struct sk_buff *skb);

void fnic_handle_link(struct work_struct *work)
{
        struct fnic *fnic = container_of(work, struct fnic, link_work);
        unsigned long flags;
        int old_link_status;
        u32 old_link_down_cnt;
        u64 old_port_speed, new_port_speed;

        spin_lock_irqsave(&fnic->fnic_lock, flags);

        fnic->link_events = 1;      /* less work to just set everytime*/

        if (fnic->stop_rx_link_events) {
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                return;
        }

        old_link_down_cnt = fnic->link_down_cnt;
        old_link_status = fnic->link_status;
        old_port_speed = atomic64_read(
                        &fnic->fnic_stats.misc_stats.current_port_speed);

        fnic->link_status = vnic_dev_link_status(fnic->vdev);
        fnic->link_down_cnt = vnic_dev_link_down_cnt(fnic->vdev);

        new_port_speed = vnic_dev_port_speed(fnic->vdev);
        atomic64_set(&fnic->fnic_stats.misc_stats.current_port_speed,
                        new_port_speed);
        if (old_port_speed != new_port_speed)
                FNIC_MAIN_DBG(KERN_INFO, fnic->lport->host,
                                "Current vnic speed set to :  %llu\n",
                                new_port_speed);

        switch (vnic_dev_port_speed(fnic->vdev)) {
        case DCEM_PORTSPEED_10G:
                fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_10GBIT;
                fnic->lport->link_supported_speeds = FC_PORTSPEED_10GBIT;
                break;
        case DCEM_PORTSPEED_20G:
                fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_20GBIT;
                fnic->lport->link_supported_speeds = FC_PORTSPEED_20GBIT;
                break;
        case DCEM_PORTSPEED_25G:
                fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_25GBIT;
                fnic->lport->link_supported_speeds = FC_PORTSPEED_25GBIT;
                break;
        case DCEM_PORTSPEED_40G:
        case DCEM_PORTSPEED_4x10G:
                fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_40GBIT;
                fnic->lport->link_supported_speeds = FC_PORTSPEED_40GBIT;
                break;
        case DCEM_PORTSPEED_100G:
                fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_100GBIT;
                fnic->lport->link_supported_speeds = FC_PORTSPEED_100GBIT;
                break;
        default:
                fc_host_speed(fnic->lport->host)   = FC_PORTSPEED_UNKNOWN;
                fnic->lport->link_supported_speeds = FC_PORTSPEED_UNKNOWN;
                break;
        }

        if (old_link_status == fnic->link_status) {
                if (!fnic->link_status) {
                        /* DOWN -> DOWN */
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        fnic_fc_trace_set_data(fnic->lport->host->host_no,
                                FNIC_FC_LE, "Link Status: DOWN->DOWN",
                                strlen("Link Status: DOWN->DOWN"));
                } else {
                        if (old_link_down_cnt != fnic->link_down_cnt) {
                                /* UP -> DOWN -> UP */
                                fnic->lport->host_stats.link_failure_count++;
                                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                                fnic_fc_trace_set_data(
                                        fnic->lport->host->host_no,
                                        FNIC_FC_LE,
                                        "Link Status:UP_DOWN_UP",
                                        strlen("Link_Status:UP_DOWN_UP")
                                        );
                                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                             "link down\n");
                                fcoe_ctlr_link_down(&fnic->ctlr);
                                if (fnic->config.flags & VFCF_FIP_CAPABLE) {
                                        /* start FCoE VLAN discovery */
                                        fnic_fc_trace_set_data(
                                                fnic->lport->host->host_no,
                                                FNIC_FC_LE,
                                                "Link Status: UP_DOWN_UP_VLAN",
                                                strlen(
                                                "Link Status: UP_DOWN_UP_VLAN")
                                                );
                                        fnic_fcoe_send_vlan_req(fnic);
                                        return;
                                }
                                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                             "link up\n");
                                fcoe_ctlr_link_up(&fnic->ctlr);
                        } else {
                                /* UP -> UP */
                                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                                fnic_fc_trace_set_data(
                                        fnic->lport->host->host_no, FNIC_FC_LE,
                                        "Link Status: UP_UP",
                                        strlen("Link Status: UP_UP"));
                        }
                }
        } else if (fnic->link_status) {
                /* DOWN -> UP */
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                if (fnic->config.flags & VFCF_FIP_CAPABLE) {
                        /* start FCoE VLAN discovery */
                                fnic_fc_trace_set_data(
                                fnic->lport->host->host_no,
                                FNIC_FC_LE, "Link Status: DOWN_UP_VLAN",
                                strlen("Link Status: DOWN_UP_VLAN"));
                        fnic_fcoe_send_vlan_req(fnic);
                        return;
                }
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
                fnic_fc_trace_set_data(fnic->lport->host->host_no, FNIC_FC_LE,
                        "Link Status: DOWN_UP", strlen("Link Status: DOWN_UP"));
                fcoe_ctlr_link_up(&fnic->ctlr);
        } else {
                /* UP -> DOWN */
                fnic->lport->host_stats.link_failure_count++;
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link down\n");
                fnic_fc_trace_set_data(
                        fnic->lport->host->host_no, FNIC_FC_LE,
                        "Link Status: UP_DOWN",
                        strlen("Link Status: UP_DOWN"));
                if (fnic->config.flags & VFCF_FIP_CAPABLE) {
                        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                "deleting fip-timer during link-down\n");
                        del_timer_sync(&fnic->fip_timer);
                }
                fcoe_ctlr_link_down(&fnic->ctlr);
        }

}

/*
 * This function passes incoming fabric frames to libFC
 */
void fnic_handle_frame(struct work_struct *work)
{
        struct fnic *fnic = container_of(work, struct fnic, frame_work);
        struct fc_lport *lp = fnic->lport;
        unsigned long flags;
        struct sk_buff *skb;
        struct fc_frame *fp;

        while ((skb = skb_dequeue(&fnic->frame_queue))) {

                spin_lock_irqsave(&fnic->fnic_lock, flags);
                if (fnic->stop_rx_link_events) {
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        dev_kfree_skb(skb);
                        return;
                }
                fp = (struct fc_frame *)skb;

                /*
                 * If we're in a transitional state, just re-queue and return.
                 * The queue will be serviced when we get to a stable state.
                 */
                if (fnic->state != FNIC_IN_FC_MODE &&
                    fnic->state != FNIC_IN_ETH_MODE) {
                        skb_queue_head(&fnic->frame_queue, skb);
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        return;
                }
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);

                fc_exch_recv(lp, fp);
        }
}

void fnic_fcoe_evlist_free(struct fnic *fnic)
{
        struct fnic_event *fevt = NULL;
        struct fnic_event *next = NULL;
        unsigned long flags;

        spin_lock_irqsave(&fnic->fnic_lock, flags);
        if (list_empty(&fnic->evlist)) {
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                return;
        }

        list_for_each_entry_safe(fevt, next, &fnic->evlist, list) {
                list_del(&fevt->list);
                kfree(fevt);
        }
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}

void fnic_handle_event(struct work_struct *work)
{
        struct fnic *fnic = container_of(work, struct fnic, event_work);
        struct fnic_event *fevt = NULL;
        struct fnic_event *next = NULL;
        unsigned long flags;

        spin_lock_irqsave(&fnic->fnic_lock, flags);
        if (list_empty(&fnic->evlist)) {
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                return;
        }

        list_for_each_entry_safe(fevt, next, &fnic->evlist, list) {
                if (fnic->stop_rx_link_events) {
                        list_del(&fevt->list);
                        kfree(fevt);
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        return;
                }
                /*
                 * If we're in a transitional state, just re-queue and return.
                 * The queue will be serviced when we get to a stable state.
                 */
                if (fnic->state != FNIC_IN_FC_MODE &&
                    fnic->state != FNIC_IN_ETH_MODE) {
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        return;
                }

                list_del(&fevt->list);
                switch (fevt->event) {
                case FNIC_EVT_START_VLAN_DISC:
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        fnic_fcoe_send_vlan_req(fnic);
                        spin_lock_irqsave(&fnic->fnic_lock, flags);
                        break;
                case FNIC_EVT_START_FCF_DISC:
                        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                  "Start FCF Discovery\n");
                        fnic_fcoe_start_fcf_disc(fnic);
                        break;
                default:
                        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                  "Unknown event 0x%x\n", fevt->event);
                        break;
                }
                kfree(fevt);
        }
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}

/**
 * is_fnic_fip_flogi_reject() - Check if the Received FIP FLOGI frame is rejected
 * @fip: The FCoE controller that received the frame
 * @skb: The received FIP frame
 *
 * Returns non-zero if the frame is rejected with unsupported cmd with
 * insufficient resource els explanation.
 */
static inline int is_fnic_fip_flogi_reject(struct fcoe_ctlr *fip,
                                         struct sk_buff *skb)
{
        struct fc_lport *lport = fip->lp;
        struct fip_header *fiph;
        struct fc_frame_header *fh = NULL;
        struct fip_desc *desc;
        struct fip_encaps *els;
        u16 op;
        u8 els_op;
        u8 sub;

        size_t rlen;
        size_t dlen = 0;

        if (skb_linearize(skb))
                return 0;

        if (skb->len < sizeof(*fiph))
                return 0;

        fiph = (struct fip_header *)skb->data;
        op = ntohs(fiph->fip_op);
        sub = fiph->fip_subcode;

        if (op != FIP_OP_LS)
                return 0;

        if (sub != FIP_SC_REP)
                return 0;

        rlen = ntohs(fiph->fip_dl_len) * 4;
        if (rlen + sizeof(*fiph) > skb->len)
                return 0;

        desc = (struct fip_desc *)(fiph + 1);
        dlen = desc->fip_dlen * FIP_BPW;

        if (desc->fip_dtype == FIP_DT_FLOGI) {

                if (dlen < sizeof(*els) + sizeof(*fh) + 1)
                        return 0;

                els = (struct fip_encaps *)desc;
                fh = (struct fc_frame_header *)(els + 1);

                if (!fh)
                        return 0;

                /*
                 * ELS command code, reason and explanation should be = Reject,
                 * unsupported command and insufficient resource
                 */
                els_op = *(u8 *)(fh + 1);
                if (els_op == ELS_LS_RJT) {
                        shost_printk(KERN_INFO, lport->host,
                                  "Flogi Request Rejected by Switch\n");
                        return 1;
                }
                shost_printk(KERN_INFO, lport->host,
                                "Flogi Request Accepted by Switch\n");
        }
        return 0;
}

static void fnic_fcoe_send_vlan_req(struct fnic *fnic)
{
        struct fcoe_ctlr *fip = &fnic->ctlr;
        struct fnic_stats *fnic_stats = &fnic->fnic_stats;
        struct sk_buff *skb;
        char *eth_fr;
        struct fip_vlan *vlan;
        u64 vlan_tov;

        fnic_fcoe_reset_vlans(fnic);
        fnic->set_vlan(fnic, 0);

        if (printk_ratelimit())
                FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
                          "Sending VLAN request...\n");

        skb = dev_alloc_skb(sizeof(struct fip_vlan));
        if (!skb)
                return;

        eth_fr = (char *)skb->data;
        vlan = (struct fip_vlan *)eth_fr;

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

        vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
        vlan->fip.fip_op = htons(FIP_OP_VLAN);
        vlan->fip.fip_subcode = FIP_SC_VL_REQ;
        vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);

        vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
        vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
        memcpy(&vlan->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);

        vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
        vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
        put_unaligned_be64(fip->lp->wwnn, &vlan->desc.wwnn.fd_wwn);
        atomic64_inc(&fnic_stats->vlan_stats.vlan_disc_reqs);

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

        /* set a timer so that we can retry if there no response */
        vlan_tov = jiffies + msecs_to_jiffies(FCOE_CTLR_FIPVLAN_TOV);
        mod_timer(&fnic->fip_timer, round_jiffies(vlan_tov));
}

static void fnic_fcoe_process_vlan_resp(struct fnic *fnic, struct sk_buff *skb)
{
        struct fcoe_ctlr *fip = &fnic->ctlr;
        struct fip_header *fiph;
        struct fip_desc *desc;
        struct fnic_stats *fnic_stats = &fnic->fnic_stats;
        u16 vid;
        size_t rlen;
        size_t dlen;
        struct fcoe_vlan *vlan;
        u64 sol_time;
        unsigned long flags;

        FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
                  "Received VLAN response...\n");

        fiph = (struct fip_header *) skb->data;

        FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
                  "Received VLAN response... OP 0x%x SUB_OP 0x%x\n",
                  ntohs(fiph->fip_op), fiph->fip_subcode);

        rlen = ntohs(fiph->fip_dl_len) * 4;
        fnic_fcoe_reset_vlans(fnic);
        spin_lock_irqsave(&fnic->vlans_lock, flags);
        desc = (struct fip_desc *)(fiph + 1);
        while (rlen > 0) {
                dlen = desc->fip_dlen * FIP_BPW;
                switch (desc->fip_dtype) {
                case FIP_DT_VLAN:
                        vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
                        shost_printk(KERN_INFO, fnic->lport->host,
                                  "process_vlan_resp: FIP VLAN %d\n", vid);
                        vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC);
                        if (!vlan) {
                                /* retry from timer */
                                spin_unlock_irqrestore(&fnic->vlans_lock,
                                                        flags);
                                goto out;
                        }
                        vlan->vid = vid & 0x0fff;
                        vlan->state = FIP_VLAN_AVAIL;
                        list_add_tail(&vlan->list, &fnic->vlans);
                        break;
                }
                desc = (struct fip_desc *)((char *)desc + dlen);
                rlen -= dlen;
        }

        /* any VLAN descriptors present ? */
        if (list_empty(&fnic->vlans)) {
                /* retry from timer */
                atomic64_inc(&fnic_stats->vlan_stats.resp_withno_vlanID);
                FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
                          "No VLAN descriptors in FIP VLAN response\n");
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                goto out;
        }

        vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
        fnic->set_vlan(fnic, vlan->vid);
        vlan->state = FIP_VLAN_SENT; /* sent now */
        vlan->sol_count++;
        spin_unlock_irqrestore(&fnic->vlans_lock, flags);

        /* start the solicitation */
        fcoe_ctlr_link_up(fip);

        sol_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY);
        mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
out:
        return;
}

static void fnic_fcoe_start_fcf_disc(struct fnic *fnic)
{
        unsigned long flags;
        struct fcoe_vlan *vlan;
        u64 sol_time;

        spin_lock_irqsave(&fnic->vlans_lock, flags);
        vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
        fnic->set_vlan(fnic, vlan->vid);
        vlan->state = FIP_VLAN_SENT; /* sent now */
        vlan->sol_count = 1;
        spin_unlock_irqrestore(&fnic->vlans_lock, flags);

        /* start the solicitation */
        fcoe_ctlr_link_up(&fnic->ctlr);

        sol_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY);
        mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
}

static int fnic_fcoe_vlan_check(struct fnic *fnic, u16 flag)
{
        unsigned long flags;
        struct fcoe_vlan *fvlan;

        spin_lock_irqsave(&fnic->vlans_lock, flags);
        if (list_empty(&fnic->vlans)) {
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                return -EINVAL;
        }

        fvlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
        if (fvlan->state == FIP_VLAN_USED) {
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                return 0;
        }

        if (fvlan->state == FIP_VLAN_SENT) {
                fvlan->state = FIP_VLAN_USED;
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                return 0;
        }
        spin_unlock_irqrestore(&fnic->vlans_lock, flags);
        return -EINVAL;
}

static void fnic_event_enq(struct fnic *fnic, enum fnic_evt ev)
{
        struct fnic_event *fevt;
        unsigned long flags;

        fevt = kmalloc(sizeof(*fevt), GFP_ATOMIC);
        if (!fevt)
                return;

        fevt->fnic = fnic;
        fevt->event = ev;

        spin_lock_irqsave(&fnic->fnic_lock, flags);
        list_add_tail(&fevt->list, &fnic->evlist);
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);

        schedule_work(&fnic->event_work);
}

static int fnic_fcoe_handle_fip_frame(struct fnic *fnic, struct sk_buff *skb)
{
        struct fip_header *fiph;
        int ret = 1;
        u16 op;
        u8 sub;

        if (!skb || !(skb->data))
                return -1;

        if (skb_linearize(skb))
                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;

        if (op == FIP_OP_DISC && sub == FIP_SC_ADV) {
                if (fnic_fcoe_vlan_check(fnic, ntohs(fiph->fip_flags)))
                        goto drop;
                /* pass it on to fcoe */
                ret = 1;
        } else if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) {
                /* set the vlan as used */
                fnic_fcoe_process_vlan_resp(fnic, skb);
                ret = 0;
        } else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
                /* received CVL request, restart vlan disc */
                fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
                /* pass it on to fcoe */
                ret = 1;
        }
drop:
        return ret;
}

void fnic_handle_fip_frame(struct work_struct *work)
{
        struct fnic *fnic = container_of(work, struct fnic, fip_frame_work);
        struct fnic_stats *fnic_stats = &fnic->fnic_stats;
        unsigned long flags;
        struct sk_buff *skb;
        struct ethhdr *eh;

        while ((skb = skb_dequeue(&fnic->fip_frame_queue))) {
                spin_lock_irqsave(&fnic->fnic_lock, flags);
                if (fnic->stop_rx_link_events) {
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        dev_kfree_skb(skb);
                        return;
                }
                /*
                 * If we're in a transitional state, just re-queue and return.
                 * The queue will be serviced when we get to a stable state.
                 */
                if (fnic->state != FNIC_IN_FC_MODE &&
                    fnic->state != FNIC_IN_ETH_MODE) {
                        skb_queue_head(&fnic->fip_frame_queue, skb);
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        return;
                }
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                eh = (struct ethhdr *)skb->data;
                if (eh->h_proto == htons(ETH_P_FIP)) {
                        skb_pull(skb, sizeof(*eh));
                        if (fnic_fcoe_handle_fip_frame(fnic, skb) <= 0) {
                                dev_kfree_skb(skb);
                                continue;
                        }
                        /*
                         * If there's FLOGI rejects - clear all
                         * fcf's & restart from scratch
                         */
                        if (is_fnic_fip_flogi_reject(&fnic->ctlr, skb)) {
                                atomic64_inc(
                                        &fnic_stats->vlan_stats.flogi_rejects);
                                shost_printk(KERN_INFO, fnic->lport->host,
                                          "Trigger a Link down - VLAN Disc\n");
                                fcoe_ctlr_link_down(&fnic->ctlr);
                                /* start FCoE VLAN discovery */
                                fnic_fcoe_send_vlan_req(fnic);
                                dev_kfree_skb(skb);
                                continue;
                        }
                        fcoe_ctlr_recv(&fnic->ctlr, skb);
                        continue;
                }
        }
}

/**
 * fnic_import_rq_eth_pkt() - handle received FCoE or FIP frame.
 * @fnic:       fnic instance.
 * @skb:        Ethernet Frame.
 */
static inline int fnic_import_rq_eth_pkt(struct fnic *fnic, struct sk_buff *skb)
{
        struct fc_frame *fp;
        struct ethhdr *eh;
        struct fcoe_hdr *fcoe_hdr;
        struct fcoe_crc_eof *ft;

        /*
         * Undo VLAN encapsulation if present.
         */
        eh = (struct ethhdr *)skb->data;
        if (eh->h_proto == htons(ETH_P_8021Q)) {
                memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
                eh = skb_pull(skb, VLAN_HLEN);
                skb_reset_mac_header(skb);
        }
        if (eh->h_proto == htons(ETH_P_FIP)) {
                if (!(fnic->config.flags & VFCF_FIP_CAPABLE)) {
                        printk(KERN_ERR "Dropped FIP frame, as firmware "
                                        "uses non-FIP mode, Enable FIP "
                                        "using UCSM\n");
                        goto drop;
                }
                if ((fnic_fc_trace_set_data(fnic->lport->host->host_no,
                        FNIC_FC_RECV|0x80, (char *)skb->data, skb->len)) != 0) {
                        printk(KERN_ERR "fnic ctlr frame trace error!!!");
                }
                skb_queue_tail(&fnic->fip_frame_queue, skb);
                queue_work(fnic_fip_queue, &fnic->fip_frame_work);
                return 1;               /* let caller know packet was used */
        }
        if (eh->h_proto != htons(ETH_P_FCOE))
                goto drop;
        skb_set_network_header(skb, sizeof(*eh));
        skb_pull(skb, sizeof(*eh));

        fcoe_hdr = (struct fcoe_hdr *)skb->data;
        if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER)
                goto drop;

        fp = (struct fc_frame *)skb;
        fc_frame_init(fp);
        fr_sof(fp) = fcoe_hdr->fcoe_sof;
        skb_pull(skb, sizeof(struct fcoe_hdr));
        skb_reset_transport_header(skb);

        ft = (struct fcoe_crc_eof *)(skb->data + skb->len - sizeof(*ft));
        fr_eof(fp) = ft->fcoe_eof;
        skb_trim(skb, skb->len - sizeof(*ft));
        return 0;
drop:
        dev_kfree_skb_irq(skb);
        return -1;
}

/**
 * fnic_update_mac_locked() - set data MAC address and filters.
 * @fnic:       fnic instance.
 * @new:        newly-assigned FCoE MAC address.
 *
 * Called with the fnic lock held.
 */
void fnic_update_mac_locked(struct fnic *fnic, u8 *new)
{
        u8 *ctl = fnic->ctlr.ctl_src_addr;
        u8 *data = fnic->data_src_addr;

        if (is_zero_ether_addr(new))
                new = ctl;
        if (ether_addr_equal(data, new))
                return;
        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "update_mac %pM\n", new);
        if (!is_zero_ether_addr(data) && !ether_addr_equal(data, ctl))
                vnic_dev_del_addr(fnic->vdev, data);
        memcpy(data, new, ETH_ALEN);
        if (!ether_addr_equal(new, ctl))
                vnic_dev_add_addr(fnic->vdev, new);
}

/**
 * fnic_update_mac() - set data MAC address and filters.
 * @lport:      local port.
 * @new:        newly-assigned FCoE MAC address.
 */
void fnic_update_mac(struct fc_lport *lport, u8 *new)
{
        struct fnic *fnic = lport_priv(lport);

        spin_lock_irq(&fnic->fnic_lock);
        fnic_update_mac_locked(fnic, new);
        spin_unlock_irq(&fnic->fnic_lock);
}

/**
 * fnic_set_port_id() - set the port_ID after successful FLOGI.
 * @lport:      local port.
 * @port_id:    assigned FC_ID.
 * @fp:         received frame containing the FLOGI accept or NULL.
 *
 * This is called from libfc when a new FC_ID has been assigned.
 * This causes us to reset the firmware to FC_MODE and setup the new MAC
 * address and FC_ID.
 *
 * It is also called with FC_ID 0 when we're logged off.
 *
 * If the FC_ID is due to point-to-point, fp may be NULL.
 */
void fnic_set_port_id(struct fc_lport *lport, u32 port_id, struct fc_frame *fp)
{
        struct fnic *fnic = lport_priv(lport);
        u8 *mac;
        int ret;

        FNIC_FCS_DBG(KERN_DEBUG, lport->host, "set port_id %x fp %p\n",
                     port_id, fp);

        /*
         * If we're clearing the FC_ID, change to use the ctl_src_addr.
         * Set ethernet mode to send FLOGI.
         */
        if (!port_id) {
                fnic_update_mac(lport, fnic->ctlr.ctl_src_addr);
                fnic_set_eth_mode(fnic);
                return;
        }

        if (fp) {
                mac = fr_cb(fp)->granted_mac;
                if (is_zero_ether_addr(mac)) {
                        /* non-FIP - FLOGI already accepted - ignore return */
                        fcoe_ctlr_recv_flogi(&fnic->ctlr, lport, fp);
                }
                fnic_update_mac(lport, mac);
        }

        /* Change state to reflect transition to FC mode */
        spin_lock_irq(&fnic->fnic_lock);
        if (fnic->state == FNIC_IN_ETH_MODE || fnic->state == FNIC_IN_FC_MODE)
                fnic->state = FNIC_IN_ETH_TRANS_FC_MODE;
        else {
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                             "Unexpected fnic state %s while"
                             " processing flogi resp\n",
                             fnic_state_to_str(fnic->state));
                spin_unlock_irq(&fnic->fnic_lock);
                return;
        }
        spin_unlock_irq(&fnic->fnic_lock);

        /*
         * Send FLOGI registration to firmware to set up FC mode.
         * The new address will be set up when registration completes.
         */
        ret = fnic_flogi_reg_handler(fnic, port_id);

        if (ret < 0) {
                spin_lock_irq(&fnic->fnic_lock);
                if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE)
                        fnic->state = FNIC_IN_ETH_MODE;
                spin_unlock_irq(&fnic->fnic_lock);
        }
}

static void fnic_rq_cmpl_frame_recv(struct vnic_rq *rq, struct cq_desc
                                    *cq_desc, struct vnic_rq_buf *buf,
                                    int skipped __attribute__((unused)),
                                    void *opaque)
{
        struct fnic *fnic = vnic_dev_priv(rq->vdev);
        struct sk_buff *skb;
        struct fc_frame *fp;
        struct fnic_stats *fnic_stats = &fnic->fnic_stats;
        u8 type, color, eop, sop, ingress_port, vlan_stripped;
        u8 fcoe = 0, fcoe_sof, fcoe_eof;
        u8 fcoe_fc_crc_ok = 1, fcoe_enc_error = 0;
        u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
        u8 ipv6, ipv4, ipv4_fragment, rss_type, csum_not_calc;
        u8 fcs_ok = 1, packet_error = 0;
        u16 q_number, completed_index, bytes_written = 0, vlan, checksum;
        u32 rss_hash;
        u16 exchange_id, tmpl;
        u8 sof = 0;
        u8 eof = 0;
        u32 fcp_bytes_written = 0;
        unsigned long flags;

        dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
                         DMA_FROM_DEVICE);
        skb = buf->os_buf;
        fp = (struct fc_frame *)skb;
        buf->os_buf = NULL;

        cq_desc_dec(cq_desc, &type, &color, &q_number, &completed_index);
        if (type == CQ_DESC_TYPE_RQ_FCP) {
                cq_fcp_rq_desc_dec((struct cq_fcp_rq_desc *)cq_desc,
                                   &type, &color, &q_number, &completed_index,
                                   &eop, &sop, &fcoe_fc_crc_ok, &exchange_id,
                                   &tmpl, &fcp_bytes_written, &sof, &eof,
                                   &ingress_port, &packet_error,
                                   &fcoe_enc_error, &fcs_ok, &vlan_stripped,
                                   &vlan);
                skb_trim(skb, fcp_bytes_written);
                fr_sof(fp) = sof;
                fr_eof(fp) = eof;

        } else if (type == CQ_DESC_TYPE_RQ_ENET) {
                cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
                                    &type, &color, &q_number, &completed_index,
                                    &ingress_port, &fcoe, &eop, &sop,
                                    &rss_type, &csum_not_calc, &rss_hash,
                                    &bytes_written, &packet_error,
                                    &vlan_stripped, &vlan, &checksum,
                                    &fcoe_sof, &fcoe_fc_crc_ok,
                                    &fcoe_enc_error, &fcoe_eof,
                                    &tcp_udp_csum_ok, &udp, &tcp,
                                    &ipv4_csum_ok, &ipv6, &ipv4,
                                    &ipv4_fragment, &fcs_ok);
                skb_trim(skb, bytes_written);
                if (!fcs_ok) {
                        atomic64_inc(&fnic_stats->misc_stats.frame_errors);
                        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                     "fcs error.  dropping packet.\n");
                        goto drop;
                }
                if (fnic_import_rq_eth_pkt(fnic, skb))
                        return;

        } else {
                /* wrong CQ type*/
                shost_printk(KERN_ERR, fnic->lport->host,
                             "fnic rq_cmpl wrong cq type x%x\n", type);
                goto drop;
        }

        if (!fcs_ok || packet_error || !fcoe_fc_crc_ok || fcoe_enc_error) {
                atomic64_inc(&fnic_stats->misc_stats.frame_errors);
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                             "fnic rq_cmpl fcoe x%x fcsok x%x"
                             " pkterr x%x fcoe_fc_crc_ok x%x, fcoe_enc_err"
                             " x%x\n",
                             fcoe, fcs_ok, packet_error,
                             fcoe_fc_crc_ok, fcoe_enc_error);
                goto drop;
        }

        spin_lock_irqsave(&fnic->fnic_lock, flags);
        if (fnic->stop_rx_link_events) {
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                goto drop;
        }
        fr_dev(fp) = fnic->lport;
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
        if ((fnic_fc_trace_set_data(fnic->lport->host->host_no, FNIC_FC_RECV,
                                        (char *)skb->data, skb->len)) != 0) {
                printk(KERN_ERR "fnic ctlr frame trace error!!!");
        }

        skb_queue_tail(&fnic->frame_queue, skb);
        queue_work(fnic_event_queue, &fnic->frame_work);

        return;
drop:
        dev_kfree_skb_irq(skb);
}

static int fnic_rq_cmpl_handler_cont(struct vnic_dev *vdev,
                                     struct cq_desc *cq_desc, u8 type,
                                     u16 q_number, u16 completed_index,
                                     void *opaque)
{
        struct fnic *fnic = vnic_dev_priv(vdev);

        vnic_rq_service(&fnic->rq[q_number], cq_desc, completed_index,
                        VNIC_RQ_RETURN_DESC, fnic_rq_cmpl_frame_recv,
                        NULL);
        return 0;
}

int fnic_rq_cmpl_handler(struct fnic *fnic, int rq_work_to_do)
{
        unsigned int tot_rq_work_done = 0, cur_work_done;
        unsigned int i;
        int err;

        for (i = 0; i < fnic->rq_count; i++) {
                cur_work_done = vnic_cq_service(&fnic->cq[i], rq_work_to_do,
                                                fnic_rq_cmpl_handler_cont,
                                                NULL);
                if (cur_work_done) {
                        err = vnic_rq_fill(&fnic->rq[i], fnic_alloc_rq_frame);
                        if (err)
                                shost_printk(KERN_ERR, fnic->lport->host,
                                             "fnic_alloc_rq_frame can't alloc"
                                             " frame\n");
                }
                tot_rq_work_done += cur_work_done;
        }

        return tot_rq_work_done;
}

/*
 * This function is called once at init time to allocate and fill RQ
 * buffers. Subsequently, it is called in the interrupt context after RQ
 * buffer processing to replenish the buffers in the RQ
 */
int fnic_alloc_rq_frame(struct vnic_rq *rq)
{
        struct fnic *fnic = vnic_dev_priv(rq->vdev);
        struct sk_buff *skb;
        u16 len;
        dma_addr_t pa;
        int r;

        len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM;
        skb = dev_alloc_skb(len);
        if (!skb) {
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                             "Unable to allocate RQ sk_buff\n");
                return -ENOMEM;
        }
        skb_reset_mac_header(skb);
        skb_reset_transport_header(skb);
        skb_reset_network_header(skb);
        skb_put(skb, len);
        pa = dma_map_single(&fnic->pdev->dev, skb->data, len, DMA_FROM_DEVICE);
        if (dma_mapping_error(&fnic->pdev->dev, pa)) {
                r = -ENOMEM;
                printk(KERN_ERR "PCI mapping failed with error %d\n", r);
                goto free_skb;
        }

        fnic_queue_rq_desc(rq, skb, pa, len);
        return 0;

free_skb:
        kfree_skb(skb);

        return r;
}

void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
{
        struct fc_frame *fp = buf->os_buf;
        struct fnic *fnic = vnic_dev_priv(rq->vdev);

        dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
                         DMA_FROM_DEVICE);

        dev_kfree_skb(fp_skb(fp));
        buf->os_buf = NULL;
}

/**
 * fnic_eth_send() - Send Ethernet frame.
 * @fip:        fcoe_ctlr instance.
 * @skb:        Ethernet Frame, FIP, without VLAN encapsulation.
 */
void fnic_eth_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
        struct fnic *fnic = fnic_from_ctlr(fip);
        struct vnic_wq *wq = &fnic->wq[0];
        dma_addr_t pa;
        struct ethhdr *eth_hdr;
        struct vlan_ethhdr *vlan_hdr;
        unsigned long flags;

        if (!fnic->vlan_hw_insert) {
                eth_hdr = (struct ethhdr *)skb_mac_header(skb);
                vlan_hdr = skb_push(skb, sizeof(*vlan_hdr) - sizeof(*eth_hdr));
                memcpy(vlan_hdr, eth_hdr, 2 * ETH_ALEN);
                vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
                vlan_hdr->h_vlan_encapsulated_proto = eth_hdr->h_proto;
                vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
                if ((fnic_fc_trace_set_data(fnic->lport->host->host_no,
                        FNIC_FC_SEND|0x80, (char *)eth_hdr, skb->len)) != 0) {
                        printk(KERN_ERR "fnic ctlr frame trace error!!!");
                }
        } else {
                if ((fnic_fc_trace_set_data(fnic->lport->host->host_no,
                        FNIC_FC_SEND|0x80, (char *)skb->data, skb->len)) != 0) {
                        printk(KERN_ERR "fnic ctlr frame trace error!!!");
                }
        }

        pa = dma_map_single(&fnic->pdev->dev, skb->data, skb->len,
                        DMA_TO_DEVICE);
        if (dma_mapping_error(&fnic->pdev->dev, pa)) {
                printk(KERN_ERR "DMA mapping failed\n");
                goto free_skb;
        }

        spin_lock_irqsave(&fnic->wq_lock[0], flags);
        if (!vnic_wq_desc_avail(wq))
                goto irq_restore;

        fnic_queue_wq_eth_desc(wq, skb, pa, skb->len,
                               0 /* hw inserts cos value */,
                               fnic->vlan_id, 1);
        spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
        return;

irq_restore:
        spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
        dma_unmap_single(&fnic->pdev->dev, pa, skb->len, DMA_TO_DEVICE);
free_skb:
        kfree_skb(skb);
}

/*
 * Send FC frame.
 */
static int fnic_send_frame(struct fnic *fnic, struct fc_frame *fp)
{
        struct vnic_wq *wq = &fnic->wq[0];
        struct sk_buff *skb;
        dma_addr_t pa;
        struct ethhdr *eth_hdr;
        struct vlan_ethhdr *vlan_hdr;
        struct fcoe_hdr *fcoe_hdr;
        struct fc_frame_header *fh;
        u32 tot_len, eth_hdr_len;
        int ret = 0;
        unsigned long flags;

        fh = fc_frame_header_get(fp);
        skb = fp_skb(fp);

        if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
            fcoe_ctlr_els_send(&fnic->ctlr, fnic->lport, skb))
                return 0;

        if (!fnic->vlan_hw_insert) {
                eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr);
                vlan_hdr = skb_push(skb, eth_hdr_len);
                eth_hdr = (struct ethhdr *)vlan_hdr;
                vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
                vlan_hdr->h_vlan_encapsulated_proto = htons(ETH_P_FCOE);
                vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
                fcoe_hdr = (struct fcoe_hdr *)(vlan_hdr + 1);
        } else {
                eth_hdr_len = sizeof(*eth_hdr) + sizeof(*fcoe_hdr);
                eth_hdr = skb_push(skb, eth_hdr_len);
                eth_hdr->h_proto = htons(ETH_P_FCOE);
                fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1);
        }

        if (fnic->ctlr.map_dest)
                fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
        else
                memcpy(eth_hdr->h_dest, fnic->ctlr.dest_addr, ETH_ALEN);
        memcpy(eth_hdr->h_source, fnic->data_src_addr, ETH_ALEN);

        tot_len = skb->len;
        BUG_ON(tot_len % 4);

        memset(fcoe_hdr, 0, sizeof(*fcoe_hdr));
        fcoe_hdr->fcoe_sof = fr_sof(fp);
        if (FC_FCOE_VER)
                FC_FCOE_ENCAPS_VER(fcoe_hdr, FC_FCOE_VER);

        pa = dma_map_single(&fnic->pdev->dev, eth_hdr, tot_len, DMA_TO_DEVICE);
        if (dma_mapping_error(&fnic->pdev->dev, pa)) {
                ret = -ENOMEM;
                printk(KERN_ERR "DMA map failed with error %d\n", ret);
                goto free_skb_on_err;
        }

        if ((fnic_fc_trace_set_data(fnic->lport->host->host_no, FNIC_FC_SEND,
                                (char *)eth_hdr, tot_len)) != 0) {
                printk(KERN_ERR "fnic ctlr frame trace error!!!");
        }

        spin_lock_irqsave(&fnic->wq_lock[0], flags);

        if (!vnic_wq_desc_avail(wq)) {
                dma_unmap_single(&fnic->pdev->dev, pa, tot_len, DMA_TO_DEVICE);
                ret = -1;
                goto irq_restore;
        }

        fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp),
                           0 /* hw inserts cos value */,
                           fnic->vlan_id, 1, 1, 1);

irq_restore:
        spin_unlock_irqrestore(&fnic->wq_lock[0], flags);

free_skb_on_err:
        if (ret)
                dev_kfree_skb_any(fp_skb(fp));

        return ret;
}

/*
 * fnic_send
 * Routine to send a raw frame
 */
int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
{
        struct fnic *fnic = lport_priv(lp);
        unsigned long flags;

        if (fnic->in_remove) {
                dev_kfree_skb(fp_skb(fp));
                return -1;
        }

        /*
         * Queue frame if in a transitional state.
         * This occurs while registering the Port_ID / MAC address after FLOGI.
         */
        spin_lock_irqsave(&fnic->fnic_lock, flags);
        if (fnic->state != FNIC_IN_FC_MODE && fnic->state != FNIC_IN_ETH_MODE) {
                skb_queue_tail(&fnic->tx_queue, fp_skb(fp));
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                return 0;
        }
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);

        return fnic_send_frame(fnic, fp);
}

/**
 * fnic_flush_tx() - send queued frames.
 * @fnic: fnic device
 *
 * Send frames that were waiting to go out in FC or Ethernet mode.
 * Whenever changing modes we purge queued frames, so these frames should
 * be queued for the stable mode that we're in, either FC or Ethernet.
 *
 * Called without fnic_lock held.
 */
void fnic_flush_tx(struct fnic *fnic)
{
        struct sk_buff *skb;
        struct fc_frame *fp;

        while ((skb = skb_dequeue(&fnic->tx_queue))) {
                fp = (struct fc_frame *)skb;
                fnic_send_frame(fnic, fp);
        }
}

/**
 * fnic_set_eth_mode() - put fnic into ethernet mode.
 * @fnic: fnic device
 *
 * Called without fnic lock held.
 */
static void fnic_set_eth_mode(struct fnic *fnic)
{
        unsigned long flags;
        enum fnic_state old_state;
        int ret;

        spin_lock_irqsave(&fnic->fnic_lock, flags);
again:
        old_state = fnic->state;
        switch (old_state) {
        case FNIC_IN_FC_MODE:
        case FNIC_IN_ETH_TRANS_FC_MODE:
        default:
                fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);

                ret = fnic_fw_reset_handler(fnic);

                spin_lock_irqsave(&fnic->fnic_lock, flags);
                if (fnic->state != FNIC_IN_FC_TRANS_ETH_MODE)
                        goto again;
                if (ret)
                        fnic->state = old_state;
                break;

        case FNIC_IN_FC_TRANS_ETH_MODE:
        case FNIC_IN_ETH_MODE:
                break;
        }
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}

static void fnic_wq_complete_frame_send(struct vnic_wq *wq,
                                        struct cq_desc *cq_desc,
                                        struct vnic_wq_buf *buf, void *opaque)
{
        struct sk_buff *skb = buf->os_buf;
        struct fc_frame *fp = (struct fc_frame *)skb;
        struct fnic *fnic = vnic_dev_priv(wq->vdev);

        dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
                         DMA_TO_DEVICE);
        dev_kfree_skb_irq(fp_skb(fp));
        buf->os_buf = NULL;
}

static int fnic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
                                     struct cq_desc *cq_desc, u8 type,
                                     u16 q_number, u16 completed_index,
                                     void *opaque)
{
        struct fnic *fnic = vnic_dev_priv(vdev);
        unsigned long flags;

        spin_lock_irqsave(&fnic->wq_lock[q_number], flags);
        vnic_wq_service(&fnic->wq[q_number], cq_desc, completed_index,
                        fnic_wq_complete_frame_send, NULL);
        spin_unlock_irqrestore(&fnic->wq_lock[q_number], flags);

        return 0;
}

int fnic_wq_cmpl_handler(struct fnic *fnic, int work_to_do)
{
        unsigned int wq_work_done = 0;
        unsigned int i;

        for (i = 0; i < fnic->raw_wq_count; i++) {
                wq_work_done  += vnic_cq_service(&fnic->cq[fnic->rq_count+i],
                                                 work_to_do,
                                                 fnic_wq_cmpl_handler_cont,
                                                 NULL);
        }

        return wq_work_done;
}


void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
{
        struct fc_frame *fp = buf->os_buf;
        struct fnic *fnic = vnic_dev_priv(wq->vdev);

        dma_unmap_single(&fnic->pdev->dev, buf->dma_addr, buf->len,
                         DMA_TO_DEVICE);

        dev_kfree_skb(fp_skb(fp));
        buf->os_buf = NULL;
}

void fnic_fcoe_reset_vlans(struct fnic *fnic)
{
        unsigned long flags;
        struct fcoe_vlan *vlan;
        struct fcoe_vlan *next;

        /*
         * indicate a link down to fcoe so that all fcf's are free'd
         * might not be required since we did this before sending vlan
         * discovery request
         */
        spin_lock_irqsave(&fnic->vlans_lock, flags);
        if (!list_empty(&fnic->vlans)) {
                list_for_each_entry_safe(vlan, next, &fnic->vlans, list) {
                        list_del(&vlan->list);
                        kfree(vlan);
                }
        }
        spin_unlock_irqrestore(&fnic->vlans_lock, flags);
}

void fnic_handle_fip_timer(struct fnic *fnic)
{
        unsigned long flags;
        struct fcoe_vlan *vlan;
        struct fnic_stats *fnic_stats = &fnic->fnic_stats;
        u64 sol_time;

        spin_lock_irqsave(&fnic->fnic_lock, flags);
        if (fnic->stop_rx_link_events) {
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                return;
        }
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);

        if (fnic->ctlr.mode == FIP_MODE_NON_FIP)
                return;

        spin_lock_irqsave(&fnic->vlans_lock, flags);
        if (list_empty(&fnic->vlans)) {
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                /* no vlans available, try again */
                if (unlikely(fnic_log_level & FNIC_FCS_LOGGING))
                        if (printk_ratelimit())
                                shost_printk(KERN_DEBUG, fnic->lport->host,
                                                "Start VLAN Discovery\n");
                fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
                return;
        }

        vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan, list);
        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                  "fip_timer: vlan %d state %d sol_count %d\n",
                  vlan->vid, vlan->state, vlan->sol_count);
        switch (vlan->state) {
        case FIP_VLAN_USED:
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                          "FIP VLAN is selected for FC transaction\n");
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                break;
        case FIP_VLAN_FAILED:
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                /* if all vlans are in failed state, restart vlan disc */
                if (unlikely(fnic_log_level & FNIC_FCS_LOGGING))
                        if (printk_ratelimit())
                                shost_printk(KERN_DEBUG, fnic->lport->host,
                                          "Start VLAN Discovery\n");
                fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
                break;
        case FIP_VLAN_SENT:
                if (vlan->sol_count >= FCOE_CTLR_MAX_SOL) {
                        /*
                         * no response on this vlan, remove  from the list.
                         * Try the next vlan
                         */
                        FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
                                  "Dequeue this VLAN ID %d from list\n",
                                  vlan->vid);
                        list_del(&vlan->list);
                        kfree(vlan);
                        vlan = NULL;
                        if (list_empty(&fnic->vlans)) {
                                /* we exhausted all vlans, restart vlan disc */
                                spin_unlock_irqrestore(&fnic->vlans_lock,
                                                        flags);
                                FNIC_FCS_DBG(KERN_INFO, fnic->lport->host,
                                          "fip_timer: vlan list empty, "
                                          "trigger vlan disc\n");
                                fnic_event_enq(fnic, FNIC_EVT_START_VLAN_DISC);
                                return;
                        }
                        /* check the next vlan */
                        vlan = list_first_entry(&fnic->vlans, struct fcoe_vlan,
                                                        list);
                        fnic->set_vlan(fnic, vlan->vid);
                        vlan->state = FIP_VLAN_SENT; /* sent now */
                }
                spin_unlock_irqrestore(&fnic->vlans_lock, flags);
                atomic64_inc(&fnic_stats->vlan_stats.sol_expiry_count);
                vlan->sol_count++;
                sol_time = jiffies + msecs_to_jiffies
                                        (FCOE_CTLR_START_DELAY);
                mod_timer(&fnic->fip_timer, round_jiffies(sol_time));
                break;
        }
}