/*
 * 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/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_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 "cq_enet_desc.h"
#include "cq_exch_desc.h"

struct workqueue_struct *fnic_event_queue;

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;

        spin_lock_irqsave(&fnic->fnic_lock, flags);

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

        if (old_link_status == fnic->link_status) {
                if (!fnic->link_status)
                        /* DOWN -> DOWN */
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                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_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                             "link down\n");
                                fc_linkdown(fnic->lport);
                                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                             "link up\n");
                                fc_linkup(fnic->lport);
                        } else
                                /* UP -> UP */
                                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                }
        } else if (fnic->link_status) {
                /* DOWN -> UP */
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
                fc_linkup(fnic->lport);
        } 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");
                fc_linkdown(fnic->lport);
        }

}

/*
 * 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 Flogi resp frame, register the address */
                if (fr_flags(fp)) {
                        vnic_dev_add_addr(fnic->vdev,
                                          fnic->data_src_addr);
                        fr_flags(fp) = 0;
                }
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);

                fc_exch_recv(lp, fp);
        }

}

static inline void fnic_import_rq_fc_frame(struct sk_buff *skb,
                                           u32 len, u8 sof, u8 eof)
{
        struct fc_frame *fp = (struct fc_frame *)skb;

        skb_trim(skb, len);
        fr_eof(fp) = eof;
        fr_sof(fp) = sof;
}


static inline int fnic_import_rq_eth_pkt(struct sk_buff *skb, u32 len)
{
        struct fc_frame *fp;
        struct ethhdr *eh;
        struct vlan_ethhdr *vh;
        struct fcoe_hdr *fcoe_hdr;
        struct fcoe_crc_eof *ft;
        u32    transport_len = 0;

        eh = (struct ethhdr *)skb->data;
        vh = (struct vlan_ethhdr *)skb->data;
        if (vh->h_vlan_proto == htons(ETH_P_8021Q) &&
            vh->h_vlan_encapsulated_proto == htons(ETH_P_FCOE)) {
                skb_pull(skb, sizeof(struct vlan_ethhdr));
                transport_len += sizeof(struct vlan_ethhdr);
        } else if (eh->h_proto == htons(ETH_P_FCOE)) {
                transport_len += sizeof(struct ethhdr);
                skb_pull(skb, sizeof(struct ethhdr));
        } else
                return -1;

        fcoe_hdr = (struct fcoe_hdr *)skb->data;
        if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER)
                return -1;

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

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

static inline int fnic_handle_flogi_resp(struct fnic *fnic,
                                         struct fc_frame *fp)
{
        u8 mac[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
        struct ethhdr *eth_hdr;
        struct fc_frame_header *fh;
        int ret = 0;
        unsigned long flags;
        struct fc_frame *old_flogi_resp = NULL;

        fh = (struct fc_frame_header *)fr_hdr(fp);

        spin_lock_irqsave(&fnic->fnic_lock, flags);

        if (fnic->state == FNIC_IN_ETH_MODE) {

                /*
                 * Check if oxid matches on taking the lock. A new Flogi
                 * issued by libFC might have changed the fnic cached oxid
                 */
                if (fnic->flogi_oxid != ntohs(fh->fh_ox_id)) {
                        FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
                                     "Flogi response oxid not"
                                     " matching cached oxid, dropping frame"
                                     "\n");
                        ret = -1;
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        dev_kfree_skb_irq(fp_skb(fp));
                        goto handle_flogi_resp_end;
                }

                /* Drop older cached flogi response frame, cache this frame */
                old_flogi_resp = fnic->flogi_resp;
                fnic->flogi_resp = fp;
                fnic->flogi_oxid = FC_XID_UNKNOWN;

                /*
                 * this frame is part of flogi get the src mac addr from this
                 * frame if the src mac is fcoui based then we mark the
                 * address mode flag to use fcoui base for dst mac addr
                 * otherwise we have to store the fcoe gateway addr
                 */
                eth_hdr = (struct ethhdr *)skb_mac_header(fp_skb(fp));
                memcpy(mac, eth_hdr->h_source, ETH_ALEN);

                if (ntoh24(mac) == FC_FCOE_OUI)
                        fnic->fcoui_mode = 1;
                else {
                        fnic->fcoui_mode = 0;
                        memcpy(fnic->dest_addr, mac, ETH_ALEN);
                }

                /*
                 * Except for Flogi frame, all outbound frames from us have the
                 * Eth Src address as FC_FCOE_OUI"our_sid". Flogi frame uses
                 * the vnic MAC address as the Eth Src address
                 */
                fc_fcoe_set_mac(fnic->data_src_addr, fh->fh_d_id);

                /* We get our s_id from the d_id of the flogi resp frame */
                fnic->s_id = ntoh24(fh->fh_d_id);

                /* Change state to reflect transition from Eth to 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));
                ret = -1;
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                dev_kfree_skb_irq(fp_skb(fp));
                goto handle_flogi_resp_end;
        }

        spin_unlock_irqrestore(&fnic->fnic_lock, flags);

        /* Drop older cached frame */
        if (old_flogi_resp)
                dev_kfree_skb_irq(fp_skb(old_flogi_resp));

        /*
         * send flogi reg request to firmware, this will put the fnic in
         * in FC mode
         */
        ret = fnic_flogi_reg_handler(fnic);

        if (ret < 0) {
                int free_fp = 1;
                spin_lock_irqsave(&fnic->fnic_lock, flags);
                /*
                 * free the frame is some other thread is not
                 * pointing to it
                 */
                if (fnic->flogi_resp != fp)
                        free_fp = 0;
                else
                        fnic->flogi_resp = NULL;

                if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE)
                        fnic->state = FNIC_IN_ETH_MODE;
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                if (free_fp)
                        dev_kfree_skb_irq(fp_skb(fp));
        }

 handle_flogi_resp_end:
        return ret;
}

/* Returns 1 for a response that matches cached flogi oxid */
static inline int is_matching_flogi_resp_frame(struct fnic *fnic,
                                               struct fc_frame *fp)
{
        struct fc_frame_header *fh;
        int ret = 0;
        u32 f_ctl;

        fh = fc_frame_header_get(fp);
        f_ctl = ntoh24(fh->fh_f_ctl);

        if (fnic->flogi_oxid == ntohs(fh->fh_ox_id) &&
            fh->fh_r_ctl == FC_RCTL_ELS_REP &&
            (f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == FC_FC_EX_CTX &&
            fh->fh_type == FC_TYPE_ELS)
                ret = 1;

        return ret;
}

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;
        unsigned int eth_hdrs_stripped;
        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;

        pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
                         PCI_DMA_FROMDEVICE);
        skb = buf->os_buf;
        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);
                eth_hdrs_stripped = 1;

        } 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);
                eth_hdrs_stripped = 0;

        } 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) {
                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;
        }

        if (eth_hdrs_stripped)
                fnic_import_rq_fc_frame(skb, fcp_bytes_written, sof, eof);
        else if (fnic_import_rq_eth_pkt(skb, bytes_written))
                goto drop;

        fp = (struct fc_frame *)skb;

        /*
         * If frame is an ELS response that matches the cached FLOGI OX_ID,
         * and is accept, issue flogi_reg_request copy wq request to firmware
         * to register the S_ID and determine whether FC_OUI mode or GW mode.
         */
        if (is_matching_flogi_resp_frame(fnic, fp)) {
                if (!eth_hdrs_stripped) {
                        if (fc_frame_payload_op(fp) == ELS_LS_ACC) {
                                fnic_handle_flogi_resp(fnic, fp);
                                return;
                        }
                        /*
                         * Recd. Flogi reject. No point registering
                         * with fw, but forward to libFC
                         */
                        goto forward;
                }
                goto drop;
        }
        if (!eth_hdrs_stripped)
                goto drop;

forward:
        spin_lock_irqsave(&fnic->fnic_lock, flags);
        if (fnic->stop_rx_link_events) {
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                goto drop;
        }
        /* Use fr_flags to indicate whether succ. flogi resp or not */
        fr_flags(fp) = 0;
        fr_dev(fp) = fnic->lport;
        spin_unlock_irqrestore(&fnic->fnic_lock, flags);

        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 cant 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;

        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 = pci_map_single(fnic->pdev, skb->data, len, PCI_DMA_FROMDEVICE);
        fnic_queue_rq_desc(rq, skb, pa, len);
        return 0;
}

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);

        pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
                         PCI_DMA_FROMDEVICE);

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

static inline int is_flogi_frame(struct fc_frame_header *fh)
{
        return fh->fh_r_ctl == FC_RCTL_ELS_REQ && *(u8 *)(fh + 1) == ELS_FLOGI;
}

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 (!fnic->vlan_hw_insert) {
                eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr);
                vlan_hdr = (struct vlan_ethhdr *)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 = (struct ethhdr *)skb_push(skb, eth_hdr_len);
                eth_hdr->h_proto = htons(ETH_P_FCOE);
                fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1);
        }

        if (is_flogi_frame(fh)) {
                fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
                memcpy(eth_hdr->h_source, fnic->mac_addr, ETH_ALEN);
        } else {
                if (fnic->fcoui_mode)
                        fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
                else
                        memcpy(eth_hdr->h_dest, fnic->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 = pci_map_single(fnic->pdev, eth_hdr, tot_len, PCI_DMA_TODEVICE);

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

        if (!vnic_wq_desc_avail(wq)) {
                pci_unmap_single(fnic->pdev, pa,
                                 tot_len, PCI_DMA_TODEVICE);
                ret = -1;
                goto fnic_send_frame_end;
        }

        fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp),
                           fnic->vlan_hw_insert, fnic->vlan_id, 1, 1, 1);
fnic_send_frame_end:
        spin_unlock_irqrestore(&fnic->wq_lock[0], flags);

        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);
        struct fc_frame_header *fh;
        int ret = 0;
        enum fnic_state old_state;
        unsigned long flags;
        struct fc_frame *old_flogi = NULL;
        struct fc_frame *old_flogi_resp = NULL;

        if (fnic->in_remove) {
                dev_kfree_skb(fp_skb(fp));
                ret = -1;
                goto fnic_send_end;
        }

        fh = fc_frame_header_get(fp);
        /* if not an Flogi frame, send it out, this is the common case */
        if (!is_flogi_frame(fh))
                return fnic_send_frame(fnic, fp);

        /* Flogi frame, now enter the state machine */

        spin_lock_irqsave(&fnic->fnic_lock, flags);
again:
        /* Get any old cached frames, free them after dropping lock */
        old_flogi = fnic->flogi;
        fnic->flogi = NULL;
        old_flogi_resp = fnic->flogi_resp;
        fnic->flogi_resp = NULL;

        fnic->flogi_oxid = FC_XID_UNKNOWN;

        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;
                vnic_dev_del_addr(fnic->vdev, fnic->data_src_addr);
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);

                if (old_flogi) {
                        dev_kfree_skb(fp_skb(old_flogi));
                        old_flogi = NULL;
                }
                if (old_flogi_resp) {
                        dev_kfree_skb(fp_skb(old_flogi_resp));
                        old_flogi_resp = NULL;
                }

                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;
                        spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                        dev_kfree_skb(fp_skb(fp));
                        goto fnic_send_end;
                }
                old_flogi = fnic->flogi;
                fnic->flogi = fp;
                fnic->flogi_oxid = ntohs(fh->fh_ox_id);
                old_flogi_resp = fnic->flogi_resp;
                fnic->flogi_resp = NULL;
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                break;

        case FNIC_IN_FC_TRANS_ETH_MODE:
                /*
                 * A reset is pending with the firmware. Store the flogi
                 * and its oxid. The transition out of this state happens
                 * only when Firmware completes the reset, either with
                 * success or failed. If success, transition to
                 * FNIC_IN_ETH_MODE, if fail, then transition to
                 * FNIC_IN_FC_MODE
                 */
                fnic->flogi = fp;
                fnic->flogi_oxid = ntohs(fh->fh_ox_id);
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                break;

        case FNIC_IN_ETH_MODE:
                /*
                 * The fw/hw is already in eth mode. Store the oxid,
                 * and send the flogi frame out. The transition out of this
                 * state happens only we receive flogi response from the
                 * network, and the oxid matches the cached oxid when the
                 * flogi frame was sent out. If they match, then we issue
                 * a flogi_reg request and transition to state
                 * FNIC_IN_ETH_TRANS_FC_MODE
                 */
                fnic->flogi_oxid = ntohs(fh->fh_ox_id);
                spin_unlock_irqrestore(&fnic->fnic_lock, flags);
                ret = fnic_send_frame(fnic, fp);
                break;
        }

fnic_send_end:
        if (old_flogi)
                dev_kfree_skb(fp_skb(old_flogi));
        if (old_flogi_resp)
                dev_kfree_skb(fp_skb(old_flogi_resp));
        return ret;
}

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);

        pci_unmap_single(fnic->pdev, buf->dma_addr,
                         buf->len, PCI_DMA_TODEVICE);
        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);

        pci_unmap_single(fnic->pdev, buf->dma_addr,
                         buf->len, PCI_DMA_TODEVICE);

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