/*
 *  PS3 gelic network driver.
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2006, 2007 Sony Corporation
 *
 * This file is based on: spider_net.c
 *
 * (C) Copyright IBM Corp. 2005
 *
 * Authors : Utz Bacher <utz.bacher@de.ibm.com>
 *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#undef DEBUG

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>

#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>

#include <linux/dma-mapping.h>
#include <net/checksum.h>
#include <asm/firmware.h>
#include <asm/ps3.h>
#include <asm/lv1call.h>

#include "ps3_gelic_net.h"
#include "ps3_gelic_wireless.h"

#define DRV_NAME "Gelic Network Driver"
#define DRV_VERSION "2.0"

MODULE_AUTHOR("SCE Inc.");
MODULE_DESCRIPTION("Gelic Network driver");
MODULE_LICENSE("GPL");


/* set irq_mask */
int gelic_card_set_irq_mask(struct gelic_card *card, u64 mask)
{
        int status;

        status = lv1_net_set_interrupt_mask(bus_id(card), dev_id(card),
                                            mask, 0);
        if (status)
                dev_info(ctodev(card),
                         "%s failed %d\n", __func__, status);
        return status;
}

static void gelic_card_rx_irq_on(struct gelic_card *card)
{
        card->irq_mask |= GELIC_CARD_RXINT;
        gelic_card_set_irq_mask(card, card->irq_mask);
}
static void gelic_card_rx_irq_off(struct gelic_card *card)
{
        card->irq_mask &= ~GELIC_CARD_RXINT;
        gelic_card_set_irq_mask(card, card->irq_mask);
}

static void gelic_card_get_ether_port_status(struct gelic_card *card,
                                             int inform)
{
        u64 v2;
        struct net_device *ether_netdev;

        lv1_net_control(bus_id(card), dev_id(card),
                        GELIC_LV1_GET_ETH_PORT_STATUS,
                        GELIC_LV1_VLAN_TX_ETHERNET_0, 0, 0,
                        &card->ether_port_status, &v2);

        if (inform) {
                ether_netdev = card->netdev[GELIC_PORT_ETHERNET_0];
                if (card->ether_port_status & GELIC_LV1_ETHER_LINK_UP)
                        netif_carrier_on(ether_netdev);
                else
                        netif_carrier_off(ether_netdev);
        }
}

static int gelic_card_set_link_mode(struct gelic_card *card, int mode)
{
        int status;
        u64 v1, v2;

        status = lv1_net_control(bus_id(card), dev_id(card),
                                 GELIC_LV1_SET_NEGOTIATION_MODE,
                                 GELIC_LV1_PHY_ETHERNET_0, mode, 0, &v1, &v2);
        if (status) {
                pr_info("%s: failed setting negotiation mode %d\n", __func__,
                        status);
                return -EBUSY;
        }

        card->link_mode = mode;
        return 0;
}

/**
 * gelic_card_disable_txdmac - disables the transmit DMA controller
 * @card: card structure
 *
 * gelic_card_disable_txdmac terminates processing on the DMA controller by
 * turing off DMA and issuing a force end
 */
static void gelic_card_disable_txdmac(struct gelic_card *card)
{
        int status;

        /* this hvc blocks until the DMA in progress really stopped */
        status = lv1_net_stop_tx_dma(bus_id(card), dev_id(card));
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_stop_tx_dma failed, status=%d\n", status);
}

/**
 * gelic_card_enable_rxdmac - enables the receive DMA controller
 * @card: card structure
 *
 * gelic_card_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
 * in the GDADMACCNTR register
 */
static void gelic_card_enable_rxdmac(struct gelic_card *card)
{
        int status;

#ifdef DEBUG
        if (gelic_descr_get_status(card->rx_chain.head) !=
            GELIC_DESCR_DMA_CARDOWNED) {
                printk(KERN_ERR "%s: status=%x\n", __func__,
                       be32_to_cpu(card->rx_chain.head->dmac_cmd_status));
                printk(KERN_ERR "%s: nextphy=%x\n", __func__,
                       be32_to_cpu(card->rx_chain.head->next_descr_addr));
                printk(KERN_ERR "%s: head=%p\n", __func__,
                       card->rx_chain.head);
        }
#endif
        status = lv1_net_start_rx_dma(bus_id(card), dev_id(card),
                                card->rx_chain.head->bus_addr, 0);
        if (status)
                dev_info(ctodev(card),
                         "lv1_net_start_rx_dma failed, status=%d\n", status);
}

/**
 * gelic_card_disable_rxdmac - disables the receive DMA controller
 * @card: card structure
 *
 * gelic_card_disable_rxdmac terminates processing on the DMA controller by
 * turing off DMA and issuing a force end
 */
static void gelic_card_disable_rxdmac(struct gelic_card *card)
{
        int status;

        /* this hvc blocks until the DMA in progress really stopped */
        status = lv1_net_stop_rx_dma(bus_id(card), dev_id(card));
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_stop_rx_dma failed, %d\n", status);
}

/**
 * gelic_descr_set_status -- sets the status of a descriptor
 * @descr: descriptor to change
 * @status: status to set in the descriptor
 *
 * changes the status to the specified value. Doesn't change other bits
 * in the status
 */
static void gelic_descr_set_status(struct gelic_descr *descr,
                                   enum gelic_descr_dma_status status)
{
        descr->dmac_cmd_status = cpu_to_be32(status |
                        (be32_to_cpu(descr->dmac_cmd_status) &
                         ~GELIC_DESCR_DMA_STAT_MASK));
        /*
         * dma_cmd_status field is used to indicate whether the descriptor
         * is valid or not.
         * Usually caller of this function wants to inform that to the
         * hardware, so we assure here the hardware sees the change.
         */
        wmb();
}

/**
 * gelic_card_reset_chain - reset status of a descriptor chain
 * @card: card structure
 * @chain: address of chain
 * @start_descr: address of descriptor array
 *
 * Reset the status of dma descriptors to ready state
 * and re-initialize the hardware chain for later use
 */
static void gelic_card_reset_chain(struct gelic_card *card,
                                   struct gelic_descr_chain *chain,
                                   struct gelic_descr *start_descr)
{
        struct gelic_descr *descr;

        for (descr = start_descr; start_descr != descr->next; descr++) {
                gelic_descr_set_status(descr, GELIC_DESCR_DMA_CARDOWNED);
                descr->next_descr_addr = cpu_to_be32(descr->next->bus_addr);
        }

        chain->head = start_descr;
        chain->tail = (descr - 1);

        (descr - 1)->next_descr_addr = 0;
}

void gelic_card_up(struct gelic_card *card)
{
        pr_debug("%s: called\n", __func__);
        mutex_lock(&card->updown_lock);
        if (atomic_inc_return(&card->users) == 1) {
                pr_debug("%s: real do\n", __func__);
                /* enable irq */
                gelic_card_set_irq_mask(card, card->irq_mask);
                /* start rx */
                gelic_card_enable_rxdmac(card);

                napi_enable(&card->napi);
        }
        mutex_unlock(&card->updown_lock);
        pr_debug("%s: done\n", __func__);
}

void gelic_card_down(struct gelic_card *card)
{
        u64 mask;
        pr_debug("%s: called\n", __func__);
        mutex_lock(&card->updown_lock);
        if (atomic_dec_if_positive(&card->users) == 0) {
                pr_debug("%s: real do\n", __func__);
                napi_disable(&card->napi);
                /*
                 * Disable irq. Wireless interrupts will
                 * be disabled later if any
                 */
                mask = card->irq_mask & (GELIC_CARD_WLAN_EVENT_RECEIVED |
                                         GELIC_CARD_WLAN_COMMAND_COMPLETED);
                gelic_card_set_irq_mask(card, mask);
                /* stop rx */
                gelic_card_disable_rxdmac(card);
                gelic_card_reset_chain(card, &card->rx_chain,
                                       card->descr + GELIC_NET_TX_DESCRIPTORS);
                /* stop tx */
                gelic_card_disable_txdmac(card);
        }
        mutex_unlock(&card->updown_lock);
        pr_debug("%s: done\n", __func__);
}

/**
 * gelic_descr_get_status -- returns the status of a descriptor
 * @descr: descriptor to look at
 *
 * returns the status as in the dmac_cmd_status field of the descriptor
 */
static enum gelic_descr_dma_status
gelic_descr_get_status(struct gelic_descr *descr)
{
        return be32_to_cpu(descr->dmac_cmd_status) & GELIC_DESCR_DMA_STAT_MASK;
}

/**
 * gelic_card_free_chain - free descriptor chain
 * @card: card structure
 * @descr_in: address of desc
 */
static void gelic_card_free_chain(struct gelic_card *card,
                                  struct gelic_descr *descr_in)
{
        struct gelic_descr *descr;

        for (descr = descr_in; descr && descr->bus_addr; descr = descr->next) {
                dma_unmap_single(ctodev(card), descr->bus_addr,
                                 GELIC_DESCR_SIZE, DMA_BIDIRECTIONAL);
                descr->bus_addr = 0;
        }
}

/**
 * gelic_card_init_chain - links descriptor chain
 * @card: card structure
 * @chain: address of chain
 * @start_descr: address of descriptor array
 * @no: number of descriptors
 *
 * we manage a circular list that mirrors the hardware structure,
 * except that the hardware uses bus addresses.
 *
 * returns 0 on success, <0 on failure
 */
static int gelic_card_init_chain(struct gelic_card *card,
                                 struct gelic_descr_chain *chain,
                                 struct gelic_descr *start_descr, int no)
{
        int i;
        struct gelic_descr *descr;

        descr = start_descr;
        memset(descr, 0, sizeof(*descr) * no);

        /* set up the hardware pointers in each descriptor */
        for (i = 0; i < no; i++, descr++) {
                gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
                descr->bus_addr =
                        dma_map_single(ctodev(card), descr,
                                       GELIC_DESCR_SIZE,
                                       DMA_BIDIRECTIONAL);

                if (!descr->bus_addr)
                        goto iommu_error;

                descr->next = descr + 1;
                descr->prev = descr - 1;
        }
        /* make them as ring */
        (descr - 1)->next = start_descr;
        start_descr->prev = (descr - 1);

        /* chain bus addr of hw descriptor */
        descr = start_descr;
        for (i = 0; i < no; i++, descr++) {
                descr->next_descr_addr = cpu_to_be32(descr->next->bus_addr);
        }

        chain->head = start_descr;
        chain->tail = start_descr;

        /* do not chain last hw descriptor */
        (descr - 1)->next_descr_addr = 0;

        return 0;

iommu_error:
        for (i--, descr--; 0 <= i; i--, descr--)
                if (descr->bus_addr)
                        dma_unmap_single(ctodev(card), descr->bus_addr,
                                         GELIC_DESCR_SIZE,
                                         DMA_BIDIRECTIONAL);
        return -ENOMEM;
}

/**
 * gelic_descr_prepare_rx - reinitializes a rx descriptor
 * @card: card structure
 * @descr: descriptor to re-init
 *
 * return 0 on success, <0 on failure
 *
 * allocates a new rx skb, iommu-maps it and attaches it to the descriptor.
 * Activate the descriptor state-wise
 */
static int gelic_descr_prepare_rx(struct gelic_card *card,
                                  struct gelic_descr *descr)
{
        int offset;
        unsigned int bufsize;

        if (gelic_descr_get_status(descr) !=  GELIC_DESCR_DMA_NOT_IN_USE)
                dev_info(ctodev(card), "%s: ERROR status\n", __func__);
        /* we need to round up the buffer size to a multiple of 128 */
        bufsize = ALIGN(GELIC_NET_MAX_MTU, GELIC_NET_RXBUF_ALIGN);

        /* and we need to have it 128 byte aligned, therefore we allocate a
         * bit more */
        descr->skb = dev_alloc_skb(bufsize + GELIC_NET_RXBUF_ALIGN - 1);
        if (!descr->skb) {
                descr->buf_addr = 0; /* tell DMAC don't touch memory */
                dev_info(ctodev(card),
                         "%s:allocate skb failed !!\n", __func__);
                return -ENOMEM;
        }
        descr->buf_size = cpu_to_be32(bufsize);
        descr->dmac_cmd_status = 0;
        descr->result_size = 0;
        descr->valid_size = 0;
        descr->data_error = 0;

        offset = ((unsigned long)descr->skb->data) &
                (GELIC_NET_RXBUF_ALIGN - 1);
        if (offset)
                skb_reserve(descr->skb, GELIC_NET_RXBUF_ALIGN - offset);
        /* io-mmu-map the skb */
        descr->buf_addr = cpu_to_be32(dma_map_single(ctodev(card),
                                                     descr->skb->data,
                                                     GELIC_NET_MAX_MTU,
                                                     DMA_FROM_DEVICE));
        if (!descr->buf_addr) {
                dev_kfree_skb_any(descr->skb);
                descr->skb = NULL;
                dev_info(ctodev(card),
                         "%s:Could not iommu-map rx buffer\n", __func__);
                gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
                return -ENOMEM;
        } else {
                gelic_descr_set_status(descr, GELIC_DESCR_DMA_CARDOWNED);
                return 0;
        }
}

/**
 * gelic_card_release_rx_chain - free all skb of rx descr
 * @card: card structure
 *
 */
static void gelic_card_release_rx_chain(struct gelic_card *card)
{
        struct gelic_descr *descr = card->rx_chain.head;

        do {
                if (descr->skb) {
                        dma_unmap_single(ctodev(card),
                                         be32_to_cpu(descr->buf_addr),
                                         descr->skb->len,
                                         DMA_FROM_DEVICE);
                        descr->buf_addr = 0;
                        dev_kfree_skb_any(descr->skb);
                        descr->skb = NULL;
                        gelic_descr_set_status(descr,
                                               GELIC_DESCR_DMA_NOT_IN_USE);
                }
                descr = descr->next;
        } while (descr != card->rx_chain.head);
}

/**
 * gelic_card_fill_rx_chain - fills descriptors/skbs in the rx chains
 * @card: card structure
 *
 * fills all descriptors in the rx chain: allocates skbs
 * and iommu-maps them.
 * returns 0 on success, < 0 on failure
 */
static int gelic_card_fill_rx_chain(struct gelic_card *card)
{
        struct gelic_descr *descr = card->rx_chain.head;
        int ret;

        do {
                if (!descr->skb) {
                        ret = gelic_descr_prepare_rx(card, descr);
                        if (ret)
                                goto rewind;
                }
                descr = descr->next;
        } while (descr != card->rx_chain.head);

        return 0;
rewind:
        gelic_card_release_rx_chain(card);
        return ret;
}

/**
 * gelic_card_alloc_rx_skbs - allocates rx skbs in rx descriptor chains
 * @card: card structure
 *
 * returns 0 on success, < 0 on failure
 */
static int gelic_card_alloc_rx_skbs(struct gelic_card *card)
{
        struct gelic_descr_chain *chain;
        int ret;
        chain = &card->rx_chain;
        ret = gelic_card_fill_rx_chain(card);
        chain->tail = card->rx_top->prev; /* point to the last */
        return ret;
}

/**
 * gelic_descr_release_tx - processes a used tx descriptor
 * @card: card structure
 * @descr: descriptor to release
 *
 * releases a used tx descriptor (unmapping, freeing of skb)
 */
static void gelic_descr_release_tx(struct gelic_card *card,
                                       struct gelic_descr *descr)
{
        struct sk_buff *skb = descr->skb;

        BUG_ON(!(be32_to_cpu(descr->data_status) & GELIC_DESCR_TX_TAIL));

        dma_unmap_single(ctodev(card), be32_to_cpu(descr->buf_addr), skb->len,
                         DMA_TO_DEVICE);
        dev_kfree_skb_any(skb);

        descr->buf_addr = 0;
        descr->buf_size = 0;
        descr->next_descr_addr = 0;
        descr->result_size = 0;
        descr->valid_size = 0;
        descr->data_status = 0;
        descr->data_error = 0;
        descr->skb = NULL;

        /* set descr status */
        gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
}

static void gelic_card_stop_queues(struct gelic_card *card)
{
        netif_stop_queue(card->netdev[GELIC_PORT_ETHERNET_0]);

        if (card->netdev[GELIC_PORT_WIRELESS])
                netif_stop_queue(card->netdev[GELIC_PORT_WIRELESS]);
}
static void gelic_card_wake_queues(struct gelic_card *card)
{
        netif_wake_queue(card->netdev[GELIC_PORT_ETHERNET_0]);

        if (card->netdev[GELIC_PORT_WIRELESS])
                netif_wake_queue(card->netdev[GELIC_PORT_WIRELESS]);
}
/**
 * gelic_card_release_tx_chain - processes sent tx descriptors
 * @card: adapter structure
 * @stop: net_stop sequence
 *
 * releases the tx descriptors that gelic has finished with
 */
static void gelic_card_release_tx_chain(struct gelic_card *card, int stop)
{
        struct gelic_descr_chain *tx_chain;
        enum gelic_descr_dma_status status;
        struct net_device *netdev;
        int release = 0;

        for (tx_chain = &card->tx_chain;
             tx_chain->head != tx_chain->tail && tx_chain->tail;
             tx_chain->tail = tx_chain->tail->next) {
                status = gelic_descr_get_status(tx_chain->tail);
                netdev = tx_chain->tail->skb->dev;
                switch (status) {
                case GELIC_DESCR_DMA_RESPONSE_ERROR:
                case GELIC_DESCR_DMA_PROTECTION_ERROR:
                case GELIC_DESCR_DMA_FORCE_END:
                        if (printk_ratelimit())
                                dev_info(ctodev(card),
                                         "%s: forcing end of tx descriptor " \
                                         "with status %x\n",
                                         __func__, status);
                        netdev->stats.tx_dropped++;
                        break;

                case GELIC_DESCR_DMA_COMPLETE:
                        if (tx_chain->tail->skb) {
                                netdev->stats.tx_packets++;
                                netdev->stats.tx_bytes +=
                                        tx_chain->tail->skb->len;
                        }
                        break;

                case GELIC_DESCR_DMA_CARDOWNED:
                        /* pending tx request */
                default:
                        /* any other value (== GELIC_DESCR_DMA_NOT_IN_USE) */
                        if (!stop)
                                goto out;
                }
                gelic_descr_release_tx(card, tx_chain->tail);
                release ++;
        }
out:
        if (!stop && release)
                gelic_card_wake_queues(card);
}

/**
 * gelic_net_set_multi - sets multicast addresses and promisc flags
 * @netdev: interface device structure
 *
 * gelic_net_set_multi configures multicast addresses as needed for the
 * netdev interface. It also sets up multicast, allmulti and promisc
 * flags appropriately
 */
void gelic_net_set_multi(struct net_device *netdev)
{
        struct gelic_card *card = netdev_card(netdev);
        struct netdev_hw_addr *ha;
        unsigned int i;
        uint8_t *p;
        u64 addr;
        int status;

        /* clear all multicast address */
        status = lv1_net_remove_multicast_address(bus_id(card), dev_id(card),
                                                  0, 1);
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_remove_multicast_address failed %d\n",
                        status);
        /* set broadcast address */
        status = lv1_net_add_multicast_address(bus_id(card), dev_id(card),
                                               GELIC_NET_BROADCAST_ADDR, 0);
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_add_multicast_address failed, %d\n",
                        status);

        if ((netdev->flags & IFF_ALLMULTI) ||
            (netdev_mc_count(netdev) > GELIC_NET_MC_COUNT_MAX)) {
                status = lv1_net_add_multicast_address(bus_id(card),
                                                       dev_id(card),
                                                       0, 1);
                if (status)
                        dev_err(ctodev(card),
                                "lv1_net_add_multicast_address failed, %d\n",
                                status);
                return;
        }

        /* set multicast addresses */
        netdev_for_each_mc_addr(ha, netdev) {
                addr = 0;
                p = ha->addr;
                for (i = 0; i < ETH_ALEN; i++) {
                        addr <<= 8;
                        addr |= *p++;
                }
                status = lv1_net_add_multicast_address(bus_id(card),
                                                       dev_id(card),
                                                       addr, 0);
                if (status)
                        dev_err(ctodev(card),
                                "lv1_net_add_multicast_address failed, %d\n",
                                status);
        }
}

/**
 * gelic_net_stop - called upon ifconfig down
 * @netdev: interface device structure
 *
 * always returns 0
 */
int gelic_net_stop(struct net_device *netdev)
{
        struct gelic_card *card;

        pr_debug("%s: start\n", __func__);

        netif_stop_queue(netdev);
        netif_carrier_off(netdev);

        card = netdev_card(netdev);
        gelic_card_down(card);

        pr_debug("%s: done\n", __func__);
        return 0;
}

/**
 * gelic_card_get_next_tx_descr - returns the next available tx descriptor
 * @card: device structure to get descriptor from
 *
 * returns the address of the next descriptor, or NULL if not available.
 */
static struct gelic_descr *
gelic_card_get_next_tx_descr(struct gelic_card *card)
{
        if (!card->tx_chain.head)
                return NULL;
        /*  see if the next descriptor is free */
        if (card->tx_chain.tail != card->tx_chain.head->next &&
            gelic_descr_get_status(card->tx_chain.head) ==
            GELIC_DESCR_DMA_NOT_IN_USE)
                return card->tx_chain.head;
        else
                return NULL;

}

/**
 * gelic_net_set_txdescr_cmdstat - sets the tx descriptor command field
 * @descr: descriptor structure to fill out
 * @skb: packet to consider
 *
 * fills out the command and status field of the descriptor structure,
 * depending on hardware checksum settings. This function assumes a wmb()
 * has executed before.
 */
static void gelic_descr_set_tx_cmdstat(struct gelic_descr *descr,
                                       struct sk_buff *skb)
{
        if (skb->ip_summed != CHECKSUM_PARTIAL)
                descr->dmac_cmd_status =
                        cpu_to_be32(GELIC_DESCR_DMA_CMD_NO_CHKSUM |
                                    GELIC_DESCR_TX_DMA_FRAME_TAIL);
        else {
                /* is packet ip?
                 * if yes: tcp? udp? */
                if (skb->protocol == htons(ETH_P_IP)) {
                        if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                                descr->dmac_cmd_status =
                                cpu_to_be32(GELIC_DESCR_DMA_CMD_TCP_CHKSUM |
                                            GELIC_DESCR_TX_DMA_FRAME_TAIL);

                        else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
                                descr->dmac_cmd_status =
                                cpu_to_be32(GELIC_DESCR_DMA_CMD_UDP_CHKSUM |
                                            GELIC_DESCR_TX_DMA_FRAME_TAIL);
                        else    /*
                                 * the stack should checksum non-tcp and non-udp
                                 * packets on his own: NETIF_F_IP_CSUM
                                 */
                                descr->dmac_cmd_status =
                                cpu_to_be32(GELIC_DESCR_DMA_CMD_NO_CHKSUM |
                                            GELIC_DESCR_TX_DMA_FRAME_TAIL);
                }
        }
}

static struct sk_buff *gelic_put_vlan_tag(struct sk_buff *skb,
                                                 unsigned short tag)
{
        struct vlan_ethhdr *veth;
        static unsigned int c;

        if (skb_headroom(skb) < VLAN_HLEN) {
                struct sk_buff *sk_tmp = skb;
                pr_debug("%s: hd=%d c=%ud\n", __func__, skb_headroom(skb), c);
                skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
                if (!skb)
                        return NULL;
                dev_kfree_skb_any(sk_tmp);
        }
        veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);

        /* Move the mac addresses to the top of buffer */
        memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);

        veth->h_vlan_proto = cpu_to_be16(ETH_P_8021Q);
        veth->h_vlan_TCI = htons(tag);

        return skb;
}

/**
 * gelic_descr_prepare_tx - setup a descriptor for sending packets
 * @card: card structure
 * @descr: descriptor structure
 * @skb: packet to use
 *
 * returns 0 on success, <0 on failure.
 *
 */
static int gelic_descr_prepare_tx(struct gelic_card *card,
                                  struct gelic_descr *descr,
                                  struct sk_buff *skb)
{
        dma_addr_t buf;

        if (card->vlan_required) {
                struct sk_buff *skb_tmp;
                enum gelic_port_type type;

                type = netdev_port(skb->dev)->type;
                skb_tmp = gelic_put_vlan_tag(skb,
                                             card->vlan[type].tx);
                if (!skb_tmp)
                        return -ENOMEM;
                skb = skb_tmp;
        }

        buf = dma_map_single(ctodev(card), skb->data, skb->len, DMA_TO_DEVICE);

        if (!buf) {
                dev_err(ctodev(card),
                        "dma map 2 failed (%p, %i). Dropping packet\n",
                        skb->data, skb->len);
                return -ENOMEM;
        }

        descr->buf_addr = cpu_to_be32(buf);
        descr->buf_size = cpu_to_be32(skb->len);
        descr->skb = skb;
        descr->data_status = 0;
        descr->next_descr_addr = 0; /* terminate hw descr */
        gelic_descr_set_tx_cmdstat(descr, skb);

        /* bump free descriptor pointer */
        card->tx_chain.head = descr->next;
        return 0;
}

/**
 * gelic_card_kick_txdma - enables TX DMA processing
 * @card: card structure
 * @descr: descriptor address to enable TX processing at
 *
 */
static int gelic_card_kick_txdma(struct gelic_card *card,
                                 struct gelic_descr *descr)
{
        int status = 0;

        if (card->tx_dma_progress)
                return 0;

        if (gelic_descr_get_status(descr) == GELIC_DESCR_DMA_CARDOWNED) {
                card->tx_dma_progress = 1;
                status = lv1_net_start_tx_dma(bus_id(card), dev_id(card),
                                              descr->bus_addr, 0);
                if (status) {
                        card->tx_dma_progress = 0;
                        dev_info(ctodev(card), "lv1_net_start_txdma failed," \
                                 "status=%d\n", status);
                }
        }
        return status;
}

/**
 * gelic_net_xmit - transmits a frame over the device
 * @skb: packet to send out
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 */
int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct gelic_card *card = netdev_card(netdev);
        struct gelic_descr *descr;
        int result;
        unsigned long flags;

        spin_lock_irqsave(&card->tx_lock, flags);

        gelic_card_release_tx_chain(card, 0);

        descr = gelic_card_get_next_tx_descr(card);
        if (!descr) {
                /*
                 * no more descriptors free
                 */
                gelic_card_stop_queues(card);
                spin_unlock_irqrestore(&card->tx_lock, flags);
                return NETDEV_TX_BUSY;
        }

        result = gelic_descr_prepare_tx(card, descr, skb);
        if (result) {
                /*
                 * DMA map failed.  As chances are that failure
                 * would continue, just release skb and return
                 */
                netdev->stats.tx_dropped++;
                dev_kfree_skb_any(skb);
                spin_unlock_irqrestore(&card->tx_lock, flags);
                return NETDEV_TX_OK;
        }
        /*
         * link this prepared descriptor to previous one
         * to achieve high performance
         */
        descr->prev->next_descr_addr = cpu_to_be32(descr->bus_addr);
        /*
         * as hardware descriptor is modified in the above lines,
         * ensure that the hardware sees it
         */
        wmb();
        if (gelic_card_kick_txdma(card, descr)) {
                /*
                 * kick failed.
                 * release descriptor which was just prepared
                 */
                netdev->stats.tx_dropped++;
                /* don't trigger BUG_ON() in gelic_descr_release_tx */
                descr->data_status = cpu_to_be32(GELIC_DESCR_TX_TAIL);
                gelic_descr_release_tx(card, descr);
                /* reset head */
                card->tx_chain.head = descr;
                /* reset hw termination */
                descr->prev->next_descr_addr = 0;
                dev_info(ctodev(card), "%s: kick failure\n", __func__);
        }

        spin_unlock_irqrestore(&card->tx_lock, flags);
        return NETDEV_TX_OK;
}

/**
 * gelic_net_pass_skb_up - takes an skb from a descriptor and passes it on
 * @descr: descriptor to process
 * @card: card structure
 * @netdev: net_device structure to be passed packet
 *
 * iommu-unmaps the skb, fills out skb structure and passes the data to the
 * stack. The descriptor state is not changed.
 */
static void gelic_net_pass_skb_up(struct gelic_descr *descr,
                                  struct gelic_card *card,
                                  struct net_device *netdev)

{
        struct sk_buff *skb = descr->skb;
        u32 data_status, data_error;

        data_status = be32_to_cpu(descr->data_status);
        data_error = be32_to_cpu(descr->data_error);
        /* unmap skb buffer */
        dma_unmap_single(ctodev(card), be32_to_cpu(descr->buf_addr),
                         GELIC_NET_MAX_MTU,
                         DMA_FROM_DEVICE);

        skb_put(skb, be32_to_cpu(descr->valid_size)?
                be32_to_cpu(descr->valid_size) :
                be32_to_cpu(descr->result_size));
        if (!descr->valid_size)
                dev_info(ctodev(card), "buffer full %x %x %x\n",
                         be32_to_cpu(descr->result_size),
                         be32_to_cpu(descr->buf_size),
                         be32_to_cpu(descr->dmac_cmd_status));

        descr->skb = NULL;
        /*
         * the card put 2 bytes vlan tag in front
         * of the ethernet frame
         */
        skb_pull(skb, 2);
        skb->protocol = eth_type_trans(skb, netdev);

        /* checksum offload */
        if (netdev->features & NETIF_F_RXCSUM) {
                if ((data_status & GELIC_DESCR_DATA_STATUS_CHK_MASK) &&
                    (!(data_error & GELIC_DESCR_DATA_ERROR_CHK_MASK)))
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                else
                        skb_checksum_none_assert(skb);
        } else
                skb_checksum_none_assert(skb);

        /* update netdevice statistics */
        netdev->stats.rx_packets++;
        netdev->stats.rx_bytes += skb->len;

        /* pass skb up to stack */
        netif_receive_skb(skb);
}

/**
 * gelic_card_decode_one_descr - processes an rx descriptor
 * @card: card structure
 *
 * returns 1 if a packet has been sent to the stack, otherwise 0
 *
 * processes an rx descriptor by iommu-unmapping the data buffer and passing
 * the packet up to the stack
 */
static int gelic_card_decode_one_descr(struct gelic_card *card)
{
        enum gelic_descr_dma_status status;
        struct gelic_descr_chain *chain = &card->rx_chain;
        struct gelic_descr *descr = chain->head;
        struct net_device *netdev = NULL;
        int dmac_chain_ended;

        status = gelic_descr_get_status(descr);

        if (status == GELIC_DESCR_DMA_CARDOWNED)
                return 0;

        if (status == GELIC_DESCR_DMA_NOT_IN_USE) {
                dev_dbg(ctodev(card), "dormant descr? %p\n", descr);
                return 0;
        }

        /* netdevice select */
        if (card->vlan_required) {
                unsigned int i;

                u16 vid;
                vid = *(u16 *)(descr->skb->data) & VLAN_VID_MASK;
                for (i = 0; i < GELIC_PORT_MAX; i++) {
                        if (card->vlan[i].rx == vid) {
                                netdev = card->netdev[i];
                                break;
                        }
                }
                if (GELIC_PORT_MAX <= i) {
                        pr_info("%s: unknown packet vid=%x\n", __func__, vid);
                        goto refill;
                }
        } else
                netdev = card->netdev[GELIC_PORT_ETHERNET_0];

        if ((status == GELIC_DESCR_DMA_RESPONSE_ERROR) ||
            (status == GELIC_DESCR_DMA_PROTECTION_ERROR) ||
            (status == GELIC_DESCR_DMA_FORCE_END)) {
                dev_info(ctodev(card), "dropping RX descriptor with state %x\n",
                         status);
                netdev->stats.rx_dropped++;
                goto refill;
        }

        if (status == GELIC_DESCR_DMA_BUFFER_FULL) {
                /*
                 * Buffer full would occur if and only if
                 * the frame length was longer than the size of this
                 * descriptor's buffer.  If the frame length was equal
                 * to or shorter than buffer'size, FRAME_END condition
                 * would occur.
                 * Anyway this frame was longer than the MTU,
                 * just drop it.
                 */
                dev_info(ctodev(card), "overlength frame\n");
                goto refill;
        }
        /*
         * descriptors any other than FRAME_END here should
         * be treated as error.
         */
        if (status != GELIC_DESCR_DMA_FRAME_END) {
                dev_dbg(ctodev(card), "RX descriptor with state %x\n",
                        status);
                goto refill;
        }

        /* ok, we've got a packet in descr */
        gelic_net_pass_skb_up(descr, card, netdev);
refill:

        /* is the current descriptor terminated with next_descr == NULL? */
        dmac_chain_ended =
                be32_to_cpu(descr->dmac_cmd_status) &
                GELIC_DESCR_RX_DMA_CHAIN_END;
        /*
         * So that always DMAC can see the end
         * of the descriptor chain to avoid
         * from unwanted DMAC overrun.
         */
        descr->next_descr_addr = 0;

        /* change the descriptor state: */
        gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);

        /*
         * this call can fail, but for now, just leave this
         * decriptor without skb
         */
        gelic_descr_prepare_rx(card, descr);

        chain->tail = descr;
        chain->head = descr->next;

        /*
         * Set this descriptor the end of the chain.
         */
        descr->prev->next_descr_addr = cpu_to_be32(descr->bus_addr);

        /*
         * If dmac chain was met, DMAC stopped.
         * thus re-enable it
         */

        if (dmac_chain_ended)
                gelic_card_enable_rxdmac(card);

        return 1;
}

/**
 * gelic_net_poll - NAPI poll function called by the stack to return packets
 * @napi: napi structure
 * @budget: number of packets we can pass to the stack at most
 *
 * returns the number of the processed packets
 *
 */
static int gelic_net_poll(struct napi_struct *napi, int budget)
{
        struct gelic_card *card = container_of(napi, struct gelic_card, napi);
        int packets_done = 0;

        while (packets_done < budget) {
                if (!gelic_card_decode_one_descr(card))
                        break;

                packets_done++;
        }

        if (packets_done < budget) {
                napi_complete(napi);
                gelic_card_rx_irq_on(card);
        }
        return packets_done;
}
/**
 * gelic_net_change_mtu - changes the MTU of an interface
 * @netdev: interface device structure
 * @new_mtu: new MTU value
 *
 * returns 0 on success, <0 on failure
 */
int gelic_net_change_mtu(struct net_device *netdev, int new_mtu)
{
        /* no need to re-alloc skbs or so -- the max mtu is about 2.3k
         * and mtu is outbound only anyway */
        if ((new_mtu < GELIC_NET_MIN_MTU) ||
            (new_mtu > GELIC_NET_MAX_MTU)) {
                return -EINVAL;
        }
        netdev->mtu = new_mtu;
        return 0;
}

/**
 * gelic_card_interrupt - event handler for gelic_net
 */
static irqreturn_t gelic_card_interrupt(int irq, void *ptr)
{
        unsigned long flags;
        struct gelic_card *card = ptr;
        u64 status;

        status = card->irq_status;

        if (!status)
                return IRQ_NONE;

        status &= card->irq_mask;

        if (status & GELIC_CARD_RXINT) {
                gelic_card_rx_irq_off(card);
                napi_schedule(&card->napi);
        }

        if (status & GELIC_CARD_TXINT) {
                spin_lock_irqsave(&card->tx_lock, flags);
                card->tx_dma_progress = 0;
                gelic_card_release_tx_chain(card, 0);
                /* kick outstanding tx descriptor if any */
                gelic_card_kick_txdma(card, card->tx_chain.tail);
                spin_unlock_irqrestore(&card->tx_lock, flags);
        }

        /* ether port status changed */
        if (status & GELIC_CARD_PORT_STATUS_CHANGED)
                gelic_card_get_ether_port_status(card, 1);

#ifdef CONFIG_GELIC_WIRELESS
        if (status & (GELIC_CARD_WLAN_EVENT_RECEIVED |
                      GELIC_CARD_WLAN_COMMAND_COMPLETED))
                gelic_wl_interrupt(card->netdev[GELIC_PORT_WIRELESS], status);
#endif

        return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/**
 * gelic_net_poll_controller - artificial interrupt for netconsole etc.
 * @netdev: interface device structure
 *
 * see Documentation/networking/netconsole.txt
 */
void gelic_net_poll_controller(struct net_device *netdev)
{
        struct gelic_card *card = netdev_card(netdev);

        gelic_card_set_irq_mask(card, 0);
        gelic_card_interrupt(netdev->irq, netdev);
        gelic_card_set_irq_mask(card, card->irq_mask);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

/**
 * gelic_net_open - called upon ifconfig up
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 *
 * gelic_net_open allocates all the descriptors and memory needed for
 * operation, sets up multicast list and enables interrupts
 */
int gelic_net_open(struct net_device *netdev)
{
        struct gelic_card *card = netdev_card(netdev);

        dev_dbg(ctodev(card), " -> %s %p\n", __func__, netdev);

        gelic_card_up(card);

        netif_start_queue(netdev);
        gelic_card_get_ether_port_status(card, 1);

        dev_dbg(ctodev(card), " <- %s\n", __func__);
        return 0;
}

void gelic_net_get_drvinfo(struct net_device *netdev,
                           struct ethtool_drvinfo *info)
{
        strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
        strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}

static int gelic_ether_get_settings(struct net_device *netdev,
                                    struct ethtool_cmd *cmd)
{
        struct gelic_card *card = netdev_card(netdev);

        gelic_card_get_ether_port_status(card, 0);

        if (card->ether_port_status & GELIC_LV1_ETHER_FULL_DUPLEX)
                cmd->duplex = DUPLEX_FULL;
        else
                cmd->duplex = DUPLEX_HALF;

        switch (card->ether_port_status & GELIC_LV1_ETHER_SPEED_MASK) {
        case GELIC_LV1_ETHER_SPEED_10:
                ethtool_cmd_speed_set(cmd, SPEED_10);
                break;
        case GELIC_LV1_ETHER_SPEED_100:
                ethtool_cmd_speed_set(cmd, SPEED_100);
                break;
        case GELIC_LV1_ETHER_SPEED_1000:
                ethtool_cmd_speed_set(cmd, SPEED_1000);
                break;
        default:
                pr_info("%s: speed unknown\n", __func__);
                ethtool_cmd_speed_set(cmd, SPEED_10);
                break;
        }

        cmd->supported = SUPPORTED_TP | SUPPORTED_Autoneg |
                        SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
                        SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
                        SUPPORTED_1000baseT_Full;
        cmd->advertising = cmd->supported;
        if (card->link_mode & GELIC_LV1_ETHER_AUTO_NEG) {
                cmd->autoneg = AUTONEG_ENABLE;
        } else {
                cmd->autoneg = AUTONEG_DISABLE;
                cmd->advertising &= ~ADVERTISED_Autoneg;
        }
        cmd->port = PORT_TP;

        return 0;
}

static int gelic_ether_set_settings(struct net_device *netdev,
                                    struct ethtool_cmd *cmd)
{
        struct gelic_card *card = netdev_card(netdev);
        u64 mode;
        int ret;

        if (cmd->autoneg == AUTONEG_ENABLE) {
                mode = GELIC_LV1_ETHER_AUTO_NEG;
        } else {
                switch (cmd->speed) {
                case SPEED_10:
                        mode = GELIC_LV1_ETHER_SPEED_10;
                        break;
                case SPEED_100:
                        mode = GELIC_LV1_ETHER_SPEED_100;
                        break;
                case SPEED_1000:
                        mode = GELIC_LV1_ETHER_SPEED_1000;
                        break;
                default:
                        return -EINVAL;
                }
                if (cmd->duplex == DUPLEX_FULL)
                        mode |= GELIC_LV1_ETHER_FULL_DUPLEX;
                else if (cmd->speed == SPEED_1000) {
                        pr_info("1000 half duplex is not supported.\n");
                        return -EINVAL;
                }
        }

        ret = gelic_card_set_link_mode(card, mode);

        if (ret)
                return ret;

        return 0;
}

static void gelic_net_get_wol(struct net_device *netdev,
                              struct ethtool_wolinfo *wol)
{
        if (0 <= ps3_compare_firmware_version(2, 2, 0))
                wol->supported = WAKE_MAGIC;
        else
                wol->supported = 0;

        wol->wolopts = ps3_sys_manager_get_wol() ? wol->supported : 0;
        memset(&wol->sopass, 0, sizeof(wol->sopass));
}
static int gelic_net_set_wol(struct net_device *netdev,
                             struct ethtool_wolinfo *wol)
{
        int status;
        struct gelic_card *card;
        u64 v1, v2;

        if (ps3_compare_firmware_version(2, 2, 0) < 0 ||
            !capable(CAP_NET_ADMIN))
                return -EPERM;

        if (wol->wolopts & ~WAKE_MAGIC)
                return -EINVAL;

        card = netdev_card(netdev);
        if (wol->wolopts & WAKE_MAGIC) {
                status = lv1_net_control(bus_id(card), dev_id(card),
                                         GELIC_LV1_SET_WOL,
                                         GELIC_LV1_WOL_MAGIC_PACKET,
                                         0, GELIC_LV1_WOL_MP_ENABLE,
                                         &v1, &v2);
                if (status) {
                        pr_info("%s: enabling WOL failed %d\n", __func__,
                                status);
                        status = -EIO;
                        goto done;
                }
                status = lv1_net_control(bus_id(card), dev_id(card),
                                         GELIC_LV1_SET_WOL,
                                         GELIC_LV1_WOL_ADD_MATCH_ADDR,
                                         0, GELIC_LV1_WOL_MATCH_ALL,
                                         &v1, &v2);
                if (!status)
                        ps3_sys_manager_set_wol(1);
                else {
                        pr_info("%s: enabling WOL filter failed %d\n",
                                __func__, status);
                        status = -EIO;
                }
        } else {
                status = lv1_net_control(bus_id(card), dev_id(card),
                                         GELIC_LV1_SET_WOL,
                                         GELIC_LV1_WOL_MAGIC_PACKET,
                                         0, GELIC_LV1_WOL_MP_DISABLE,
                                         &v1, &v2);
                if (status) {
                        pr_info("%s: disabling WOL failed %d\n", __func__,
                                status);
                        status = -EIO;
                        goto done;
                }
                status = lv1_net_control(bus_id(card), dev_id(card),
                                         GELIC_LV1_SET_WOL,
                                         GELIC_LV1_WOL_DELETE_MATCH_ADDR,
                                         0, GELIC_LV1_WOL_MATCH_ALL,
                                         &v1, &v2);
                if (!status)
                        ps3_sys_manager_set_wol(0);
                else {
                        pr_info("%s: removing WOL filter failed %d\n",
                                __func__, status);
                        status = -EIO;
                }
        }
done:
        return status;
}

static const struct ethtool_ops gelic_ether_ethtool_ops = {
        .get_drvinfo    = gelic_net_get_drvinfo,
        .get_settings   = gelic_ether_get_settings,
        .set_settings   = gelic_ether_set_settings,
        .get_link       = ethtool_op_get_link,
        .get_wol        = gelic_net_get_wol,
        .set_wol        = gelic_net_set_wol,
};

/**
 * gelic_net_tx_timeout_task - task scheduled by the watchdog timeout
 * function (to be called not under interrupt status)
 * @work: work is context of tx timout task
 *
 * called as task when tx hangs, resets interface (if interface is up)
 */
static void gelic_net_tx_timeout_task(struct work_struct *work)
{
        struct gelic_card *card =
                container_of(work, struct gelic_card, tx_timeout_task);
        struct net_device *netdev = card->netdev[GELIC_PORT_ETHERNET_0];

        dev_info(ctodev(card), "%s:Timed out. Restarting...\n", __func__);

        if (!(netdev->flags & IFF_UP))
                goto out;

        netif_device_detach(netdev);
        gelic_net_stop(netdev);

        gelic_net_open(netdev);
        netif_device_attach(netdev);

out:
        atomic_dec(&card->tx_timeout_task_counter);
}

/**
 * gelic_net_tx_timeout - called when the tx timeout watchdog kicks in.
 * @netdev: interface device structure
 *
 * called, if tx hangs. Schedules a task that resets the interface
 */
void gelic_net_tx_timeout(struct net_device *netdev)
{
        struct gelic_card *card;

        card = netdev_card(netdev);
        atomic_inc(&card->tx_timeout_task_counter);
        if (netdev->flags & IFF_UP)
                schedule_work(&card->tx_timeout_task);
        else
                atomic_dec(&card->tx_timeout_task_counter);
}

static const struct net_device_ops gelic_netdevice_ops = {
        .ndo_open = gelic_net_open,
        .ndo_stop = gelic_net_stop,
        .ndo_start_xmit = gelic_net_xmit,
        .ndo_set_rx_mode = gelic_net_set_multi,
        .ndo_change_mtu = gelic_net_change_mtu,
        .ndo_tx_timeout = gelic_net_tx_timeout,
        .ndo_set_mac_address = eth_mac_addr,
        .ndo_validate_addr = eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller = gelic_net_poll_controller,
#endif
};

/**
 * gelic_ether_setup_netdev_ops - initialization of net_device operations
 * @netdev: net_device structure
 *
 * fills out function pointers in the net_device structure
 */
static void gelic_ether_setup_netdev_ops(struct net_device *netdev,
                                         struct napi_struct *napi)
{
        netdev->watchdog_timeo = GELIC_NET_WATCHDOG_TIMEOUT;
        /* NAPI */
        netif_napi_add(netdev, napi, gelic_net_poll, NAPI_POLL_WEIGHT);
        netdev->ethtool_ops = &gelic_ether_ethtool_ops;
        netdev->netdev_ops = &gelic_netdevice_ops;
}

/**
 * gelic_ether_setup_netdev - initialization of net_device
 * @netdev: net_device structure
 * @card: card structure
 *
 * Returns 0 on success or <0 on failure
 *
 * gelic_ether_setup_netdev initializes the net_device structure
 * and register it.
 **/
int gelic_net_setup_netdev(struct net_device *netdev, struct gelic_card *card)
{
        int status;
        u64 v1, v2;

        netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;

        netdev->features = NETIF_F_IP_CSUM;
        if (GELIC_CARD_RX_CSUM_DEFAULT)
                netdev->features |= NETIF_F_RXCSUM;

        status = lv1_net_control(bus_id(card), dev_id(card),
                                 GELIC_LV1_GET_MAC_ADDRESS,
                                 0, 0, 0, &v1, &v2);
        v1 <<= 16;
        if (status || !is_valid_ether_addr((u8 *)&v1)) {
                dev_info(ctodev(card),
                         "%s:lv1_net_control GET_MAC_ADDR failed %d\n",
                         __func__, status);
                return -EINVAL;
        }
        memcpy(netdev->dev_addr, &v1, ETH_ALEN);

        if (card->vlan_required) {
                netdev->hard_header_len += VLAN_HLEN;
                /*
                 * As vlan is internally used,
                 * we can not receive vlan packets
                 */
                netdev->features |= NETIF_F_VLAN_CHALLENGED;
        }

        status = register_netdev(netdev);
        if (status) {
                dev_err(ctodev(card), "%s:Couldn't register %s %d\n",
                        __func__, netdev->name, status);
                return status;
        }
        dev_info(ctodev(card), "%s: MAC addr %pM\n",
                 netdev->name, netdev->dev_addr);

        return 0;
}

/**
 * gelic_alloc_card_net - allocates net_device and card structure
 *
 * returns the card structure or NULL in case of errors
 *
 * the card and net_device structures are linked to each other
 */
#define GELIC_ALIGN (32)
static struct gelic_card *gelic_alloc_card_net(struct net_device **netdev)
{
        struct gelic_card *card;
        struct gelic_port *port;
        void *p;
        size_t alloc_size;
        /*
         * gelic requires dma descriptor is 32 bytes aligned and
         * the hypervisor requires irq_status is 8 bytes aligned.
         */
        BUILD_BUG_ON(offsetof(struct gelic_card, irq_status) % 8);
        BUILD_BUG_ON(offsetof(struct gelic_card, descr) % 32);
        alloc_size =
                sizeof(struct gelic_card) +
                sizeof(struct gelic_descr) * GELIC_NET_RX_DESCRIPTORS +
                sizeof(struct gelic_descr) * GELIC_NET_TX_DESCRIPTORS +
                GELIC_ALIGN - 1;

        p  = kzalloc(alloc_size, GFP_KERNEL);
        if (!p)
                return NULL;
        card = PTR_ALIGN(p, GELIC_ALIGN);
        card->unalign = p;

        /*
         * alloc netdev
         */
        *netdev = alloc_etherdev(sizeof(struct gelic_port));
        if (!netdev) {
                kfree(card->unalign);
                return NULL;
        }
        port = netdev_priv(*netdev);

        /* gelic_port */
        port->netdev = *netdev;
        port->card = card;
        port->type = GELIC_PORT_ETHERNET_0;

        /* gelic_card */
        card->netdev[GELIC_PORT_ETHERNET_0] = *netdev;

        INIT_WORK(&card->tx_timeout_task, gelic_net_tx_timeout_task);
        init_waitqueue_head(&card->waitq);
        atomic_set(&card->tx_timeout_task_counter, 0);
        mutex_init(&card->updown_lock);
        atomic_set(&card->users, 0);

        return card;
}

static void gelic_card_get_vlan_info(struct gelic_card *card)
{
        u64 v1, v2;
        int status;
        unsigned int i;
        struct {
                int tx;
                int rx;
        } vlan_id_ix[2] = {
                [GELIC_PORT_ETHERNET_0] = {
                        .tx = GELIC_LV1_VLAN_TX_ETHERNET_0,
                        .rx = GELIC_LV1_VLAN_RX_ETHERNET_0
                },
                [GELIC_PORT_WIRELESS] = {
                        .tx = GELIC_LV1_VLAN_TX_WIRELESS,
                        .rx = GELIC_LV1_VLAN_RX_WIRELESS
                }
        };

        for (i = 0; i < ARRAY_SIZE(vlan_id_ix); i++) {
                /* tx tag */
                status = lv1_net_control(bus_id(card), dev_id(card),
                                         GELIC_LV1_GET_VLAN_ID,
                                         vlan_id_ix[i].tx,
                                         0, 0, &v1, &v2);
                if (status || !v1) {
                        if (status != LV1_NO_ENTRY)
                                dev_dbg(ctodev(card),
                                        "get vlan id for tx(%d) failed(%d)\n",
                                        vlan_id_ix[i].tx, status);
                        card->vlan[i].tx = 0;
                        card->vlan[i].rx = 0;
                        continue;
                }
                card->vlan[i].tx = (u16)v1;

                /* rx tag */
                status = lv1_net_control(bus_id(card), dev_id(card),
                                         GELIC_LV1_GET_VLAN_ID,
                                         vlan_id_ix[i].rx,
                                         0, 0, &v1, &v2);
                if (status || !v1) {
                        if (status != LV1_NO_ENTRY)
                                dev_info(ctodev(card),
                                         "get vlan id for rx(%d) failed(%d)\n",
                                         vlan_id_ix[i].rx, status);
                        card->vlan[i].tx = 0;
                        card->vlan[i].rx = 0;
                        continue;
                }
                card->vlan[i].rx = (u16)v1;

                dev_dbg(ctodev(card), "vlan_id[%d] tx=%02x rx=%02x\n",
                        i, card->vlan[i].tx, card->vlan[i].rx);
        }

        if (card->vlan[GELIC_PORT_ETHERNET_0].tx) {
                BUG_ON(!card->vlan[GELIC_PORT_WIRELESS].tx);
                card->vlan_required = 1;
        } else
                card->vlan_required = 0;

        /* check wirelss capable firmware */
        if (ps3_compare_firmware_version(1, 6, 0) < 0) {
                card->vlan[GELIC_PORT_WIRELESS].tx = 0;
                card->vlan[GELIC_PORT_WIRELESS].rx = 0;
        }

        dev_info(ctodev(card), "internal vlan %s\n",
                 card->vlan_required? "enabled" : "disabled");
}
/**
 * ps3_gelic_driver_probe - add a device to the control of this driver
 */
static int ps3_gelic_driver_probe(struct ps3_system_bus_device *dev)
{
        struct gelic_card *card;
        struct net_device *netdev;
        int result;

        pr_debug("%s: called\n", __func__);

        udbg_shutdown_ps3gelic();

        result = ps3_open_hv_device(dev);

        if (result) {
                dev_dbg(&dev->core, "%s:ps3_open_hv_device failed\n",
                        __func__);
                goto fail_open;
        }

        result = ps3_dma_region_create(dev->d_region);

        if (result) {
                dev_dbg(&dev->core, "%s:ps3_dma_region_create failed(%d)\n",
                        __func__, result);
                BUG_ON("check region type");
                goto fail_dma_region;
        }

        /* alloc card/netdevice */
        card = gelic_alloc_card_net(&netdev);
        if (!card) {
                dev_info(&dev->core, "%s:gelic_net_alloc_card failed\n",
                         __func__);
                result = -ENOMEM;
                goto fail_alloc_card;
        }
        ps3_system_bus_set_drvdata(dev, card);
        card->dev = dev;

        /* get internal vlan info */
        gelic_card_get_vlan_info(card);

        card->link_mode = GELIC_LV1_ETHER_AUTO_NEG;

        /* setup interrupt */
        result = lv1_net_set_interrupt_status_indicator(bus_id(card),
                                                        dev_id(card),
                ps3_mm_phys_to_lpar(__pa(&card->irq_status)),
                0);

        if (result) {
                dev_dbg(&dev->core,
                        "%s:set_interrupt_status_indicator failed: %s\n",
                        __func__, ps3_result(result));
                result = -EIO;
                goto fail_status_indicator;
        }

        result = ps3_sb_event_receive_port_setup(dev, PS3_BINDING_CPU_ANY,
                &card->irq);

        if (result) {
                dev_info(ctodev(card),
                         "%s:gelic_net_open_device failed (%d)\n",
                         __func__, result);
                result = -EPERM;
                goto fail_alloc_irq;
        }
        result = request_irq(card->irq, gelic_card_interrupt,
                             0, netdev->name, card);

        if (result) {
                dev_info(ctodev(card), "%s:request_irq failed (%d)\n",
                        __func__, result);
                goto fail_request_irq;
        }

        /* setup card structure */
        card->irq_mask = GELIC_CARD_RXINT | GELIC_CARD_TXINT |
                GELIC_CARD_PORT_STATUS_CHANGED;


        if (gelic_card_init_chain(card, &card->tx_chain,
                        card->descr, GELIC_NET_TX_DESCRIPTORS))
                goto fail_alloc_tx;
        if (gelic_card_init_chain(card, &card->rx_chain,
                                 card->descr + GELIC_NET_TX_DESCRIPTORS,
                                 GELIC_NET_RX_DESCRIPTORS))
                goto fail_alloc_rx;

        /* head of chain */
        card->tx_top = card->tx_chain.head;
        card->rx_top = card->rx_chain.head;
        dev_dbg(ctodev(card), "descr rx %p, tx %p, size %#lx, num %#x\n",
                card->rx_top, card->tx_top, sizeof(struct gelic_descr),
                GELIC_NET_RX_DESCRIPTORS);
        /* allocate rx skbs */
        if (gelic_card_alloc_rx_skbs(card))
                goto fail_alloc_skbs;

        spin_lock_init(&card->tx_lock);
        card->tx_dma_progress = 0;

        /* setup net_device structure */
        netdev->irq = card->irq;
        SET_NETDEV_DEV(netdev, &card->dev->core);
        gelic_ether_setup_netdev_ops(netdev, &card->napi);
        result = gelic_net_setup_netdev(netdev, card);
        if (result) {
                dev_dbg(&dev->core, "%s: setup_netdev failed %d",
                        __func__, result);
                goto fail_setup_netdev;
        }

#ifdef CONFIG_GELIC_WIRELESS
        if (gelic_wl_driver_probe(card)) {
                dev_dbg(&dev->core, "%s: WL init failed\n", __func__);
                goto fail_setup_netdev;
        }
#endif
        pr_debug("%s: done\n", __func__);
        return 0;

fail_setup_netdev:
fail_alloc_skbs:
        gelic_card_free_chain(card, card->rx_chain.head);
fail_alloc_rx:
        gelic_card_free_chain(card, card->tx_chain.head);
fail_alloc_tx:
        free_irq(card->irq, card);
        netdev->irq = NO_IRQ;
fail_request_irq:
        ps3_sb_event_receive_port_destroy(dev, card->irq);
fail_alloc_irq:
        lv1_net_set_interrupt_status_indicator(bus_id(card),
                                               bus_id(card),
                                               0, 0);
fail_status_indicator:
        ps3_system_bus_set_drvdata(dev, NULL);
        kfree(netdev_card(netdev)->unalign);
        free_netdev(netdev);
fail_alloc_card:
        ps3_dma_region_free(dev->d_region);
fail_dma_region:
        ps3_close_hv_device(dev);
fail_open:
        return result;
}

/**
 * ps3_gelic_driver_remove - remove a device from the control of this driver
 */

static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev)
{
        struct gelic_card *card = ps3_system_bus_get_drvdata(dev);
        struct net_device *netdev0;
        pr_debug("%s: called\n", __func__);

        /* set auto-negotiation */
        gelic_card_set_link_mode(card, GELIC_LV1_ETHER_AUTO_NEG);

#ifdef CONFIG_GELIC_WIRELESS
        gelic_wl_driver_remove(card);
#endif
        /* stop interrupt */
        gelic_card_set_irq_mask(card, 0);

        /* turn off DMA, force end */
        gelic_card_disable_rxdmac(card);
        gelic_card_disable_txdmac(card);

        /* release chains */
        gelic_card_release_tx_chain(card, 1);
        gelic_card_release_rx_chain(card);

        gelic_card_free_chain(card, card->tx_top);
        gelic_card_free_chain(card, card->rx_top);

        netdev0 = card->netdev[GELIC_PORT_ETHERNET_0];
        /* disconnect event port */
        free_irq(card->irq, card);
        netdev0->irq = NO_IRQ;
        ps3_sb_event_receive_port_destroy(card->dev, card->irq);

        wait_event(card->waitq,
                   atomic_read(&card->tx_timeout_task_counter) == 0);

        lv1_net_set_interrupt_status_indicator(bus_id(card), dev_id(card),
                                               0 , 0);

        unregister_netdev(netdev0);
        kfree(netdev_card(netdev0)->unalign);
        free_netdev(netdev0);

        ps3_system_bus_set_drvdata(dev, NULL);

        ps3_dma_region_free(dev->d_region);

        ps3_close_hv_device(dev);

        pr_debug("%s: done\n", __func__);
        return 0;
}

static struct ps3_system_bus_driver ps3_gelic_driver = {
        .match_id = PS3_MATCH_ID_GELIC,
        .probe = ps3_gelic_driver_probe,
        .remove = ps3_gelic_driver_remove,
        .shutdown = ps3_gelic_driver_remove,
        .core.name = "ps3_gelic_driver",
        .core.owner = THIS_MODULE,
};

static int __init ps3_gelic_driver_init (void)
{
        return firmware_has_feature(FW_FEATURE_PS3_LV1)
                ? ps3_system_bus_driver_register(&ps3_gelic_driver)
                : -ENODEV;
}

static void __exit ps3_gelic_driver_exit (void)
{
        ps3_system_bus_driver_unregister(&ps3_gelic_driver);
}

module_init(ps3_gelic_driver_init);
module_exit(ps3_gelic_driver_exit);

MODULE_ALIAS(PS3_MODULE_ALIAS_GELIC);