/******************************************************************************
* This software may be used and distributed according to the terms of
* the GNU General Public License (GPL), incorporated herein by reference.
* Drivers based on or derived from this code fall under the GPL and must
* retain the authorship, copyright and license notice.  This file is not
* a complete program and may only be used when the entire operating
* system is licensed under the GPL.
* See the file COPYING in this distribution for more information.
*
* vxge-main.c: Driver for Exar Corp's X3100 Series 10GbE PCIe I/O
*              Virtualized Server Adapter.
* Copyright(c) 2002-2010 Exar Corp.
*
* The module loadable parameters that are supported by the driver and a brief
* explanation of all the variables:
* vlan_tag_strip:
*       Strip VLAN Tag enable/disable. Instructs the device to remove
*       the VLAN tag from all received tagged frames that are not
*       replicated at the internal L2 switch.
*               0 - Do not strip the VLAN tag.
*               1 - Strip the VLAN tag.
*
* addr_learn_en:
*       Enable learning the mac address of the guest OS interface in
*       a virtualization environment.
*               0 - DISABLE
*               1 - ENABLE
*
* max_config_port:
*       Maximum number of port to be supported.
*               MIN -1 and MAX - 2
*
* max_config_vpath:
*       This configures the maximum no of VPATH configures for each
*       device function.
*               MIN - 1 and MAX - 17
*
* max_config_dev:
*       This configures maximum no of Device function to be enabled.
*               MIN - 1 and MAX - 17
*
******************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/bitops.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <net/ip.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/firmware.h>
#include <linux/net_tstamp.h>
#include <linux/prefetch.h>
#include <linux/module.h>
#include "vxge-main.h"
#include "vxge-reg.h"

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Neterion's X3100 Series 10GbE PCIe I/O"
        "Virtualized Server Adapter");

static const struct pci_device_id vxge_id_table[] = {
        {PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_TITAN_WIN, PCI_ANY_ID,
        PCI_ANY_ID},
        {PCI_VENDOR_ID_S2IO, PCI_DEVICE_ID_TITAN_UNI, PCI_ANY_ID,
        PCI_ANY_ID},
        {0}
};

MODULE_DEVICE_TABLE(pci, vxge_id_table);

VXGE_MODULE_PARAM_INT(vlan_tag_strip, VXGE_HW_VPATH_RPA_STRIP_VLAN_TAG_ENABLE);
VXGE_MODULE_PARAM_INT(addr_learn_en, VXGE_HW_MAC_ADDR_LEARN_DEFAULT);
VXGE_MODULE_PARAM_INT(max_config_port, VXGE_MAX_CONFIG_PORT);
VXGE_MODULE_PARAM_INT(max_config_vpath, VXGE_USE_DEFAULT);
VXGE_MODULE_PARAM_INT(max_mac_vpath, VXGE_MAX_MAC_ADDR_COUNT);
VXGE_MODULE_PARAM_INT(max_config_dev, VXGE_MAX_CONFIG_DEV);

static u16 vpath_selector[VXGE_HW_MAX_VIRTUAL_PATHS] =
                {0, 1, 3, 3, 7, 7, 7, 7, 15, 15, 15, 15, 15, 15, 15, 15, 31};
static unsigned int bw_percentage[VXGE_HW_MAX_VIRTUAL_PATHS] =
        {[0 ...(VXGE_HW_MAX_VIRTUAL_PATHS - 1)] = 0xFF};
module_param_array(bw_percentage, uint, NULL, 0);

static struct vxge_drv_config *driver_config;
static enum vxge_hw_status vxge_reset_all_vpaths(struct vxgedev *vdev);

static inline int is_vxge_card_up(struct vxgedev *vdev)
{
        return test_bit(__VXGE_STATE_CARD_UP, &vdev->state);
}

static inline void VXGE_COMPLETE_VPATH_TX(struct vxge_fifo *fifo)
{
        struct sk_buff **skb_ptr = NULL;
        struct sk_buff **temp;
#define NR_SKB_COMPLETED 128
        struct sk_buff *completed[NR_SKB_COMPLETED];
        int more;

        do {
                more = 0;
                skb_ptr = completed;

                if (__netif_tx_trylock(fifo->txq)) {
                        vxge_hw_vpath_poll_tx(fifo->handle, &skb_ptr,
                                                NR_SKB_COMPLETED, &more);
                        __netif_tx_unlock(fifo->txq);
                }

                /* free SKBs */
                for (temp = completed; temp != skb_ptr; temp++)
                        dev_kfree_skb_irq(*temp);
        } while (more);
}

static inline void VXGE_COMPLETE_ALL_TX(struct vxgedev *vdev)
{
        int i;

        /* Complete all transmits */
        for (i = 0; i < vdev->no_of_vpath; i++)
                VXGE_COMPLETE_VPATH_TX(&vdev->vpaths[i].fifo);
}

static inline void VXGE_COMPLETE_ALL_RX(struct vxgedev *vdev)
{
        int i;
        struct vxge_ring *ring;

        /* Complete all receives*/
        for (i = 0; i < vdev->no_of_vpath; i++) {
                ring = &vdev->vpaths[i].ring;
                vxge_hw_vpath_poll_rx(ring->handle);
        }
}

/*
 * vxge_callback_link_up
 *
 * This function is called during interrupt context to notify link up state
 * change.
 */
static void vxge_callback_link_up(struct __vxge_hw_device *hldev)
{
        struct net_device *dev = hldev->ndev;
        struct vxgedev *vdev = netdev_priv(dev);

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                vdev->ndev->name, __func__, __LINE__);
        netdev_notice(vdev->ndev, "Link Up\n");
        vdev->stats.link_up++;

        netif_carrier_on(vdev->ndev);
        netif_tx_wake_all_queues(vdev->ndev);

        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d Exiting...", vdev->ndev->name, __func__, __LINE__);
}

/*
 * vxge_callback_link_down
 *
 * This function is called during interrupt context to notify link down state
 * change.
 */
static void vxge_callback_link_down(struct __vxge_hw_device *hldev)
{
        struct net_device *dev = hldev->ndev;
        struct vxgedev *vdev = netdev_priv(dev);

        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d", vdev->ndev->name, __func__, __LINE__);
        netdev_notice(vdev->ndev, "Link Down\n");

        vdev->stats.link_down++;
        netif_carrier_off(vdev->ndev);
        netif_tx_stop_all_queues(vdev->ndev);

        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d Exiting...", vdev->ndev->name, __func__, __LINE__);
}

/*
 * vxge_rx_alloc
 *
 * Allocate SKB.
 */
static struct sk_buff *
vxge_rx_alloc(void *dtrh, struct vxge_ring *ring, const int skb_size)
{
        struct net_device    *dev;
        struct sk_buff       *skb;
        struct vxge_rx_priv *rx_priv;

        dev = ring->ndev;
        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                ring->ndev->name, __func__, __LINE__);

        rx_priv = vxge_hw_ring_rxd_private_get(dtrh);

        /* try to allocate skb first. this one may fail */
        skb = netdev_alloc_skb(dev, skb_size +
        VXGE_HW_HEADER_ETHERNET_II_802_3_ALIGN);
        if (skb == NULL) {
                vxge_debug_mem(VXGE_ERR,
                        "%s: out of memory to allocate SKB", dev->name);
                ring->stats.skb_alloc_fail++;
                return NULL;
        }

        vxge_debug_mem(VXGE_TRACE,
                "%s: %s:%d  Skb : 0x%p", ring->ndev->name,
                __func__, __LINE__, skb);

        skb_reserve(skb, VXGE_HW_HEADER_ETHERNET_II_802_3_ALIGN);

        rx_priv->skb = skb;
        rx_priv->skb_data = NULL;
        rx_priv->data_size = skb_size;
        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d Exiting...", ring->ndev->name, __func__, __LINE__);

        return skb;
}

/*
 * vxge_rx_map
 */
static int vxge_rx_map(void *dtrh, struct vxge_ring *ring)
{
        struct vxge_rx_priv *rx_priv;
        dma_addr_t dma_addr;

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                ring->ndev->name, __func__, __LINE__);
        rx_priv = vxge_hw_ring_rxd_private_get(dtrh);

        rx_priv->skb_data = rx_priv->skb->data;
        dma_addr = pci_map_single(ring->pdev, rx_priv->skb_data,
                                rx_priv->data_size, PCI_DMA_FROMDEVICE);

        if (unlikely(pci_dma_mapping_error(ring->pdev, dma_addr))) {
                ring->stats.pci_map_fail++;
                return -EIO;
        }
        vxge_debug_mem(VXGE_TRACE,
                "%s: %s:%d  1 buffer mode dma_addr = 0x%llx",
                ring->ndev->name, __func__, __LINE__,
                (unsigned long long)dma_addr);
        vxge_hw_ring_rxd_1b_set(dtrh, dma_addr, rx_priv->data_size);

        rx_priv->data_dma = dma_addr;
        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d Exiting...", ring->ndev->name, __func__, __LINE__);

        return 0;
}

/*
 * vxge_rx_initial_replenish
 * Allocation of RxD as an initial replenish procedure.
 */
static enum vxge_hw_status
vxge_rx_initial_replenish(void *dtrh, void *userdata)
{
        struct vxge_ring *ring = (struct vxge_ring *)userdata;
        struct vxge_rx_priv *rx_priv;

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                ring->ndev->name, __func__, __LINE__);
        if (vxge_rx_alloc(dtrh, ring,
                          VXGE_LL_MAX_FRAME_SIZE(ring->ndev)) == NULL)
                return VXGE_HW_FAIL;

        if (vxge_rx_map(dtrh, ring)) {
                rx_priv = vxge_hw_ring_rxd_private_get(dtrh);
                dev_kfree_skb(rx_priv->skb);

                return VXGE_HW_FAIL;
        }
        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d Exiting...", ring->ndev->name, __func__, __LINE__);

        return VXGE_HW_OK;
}

static inline void
vxge_rx_complete(struct vxge_ring *ring, struct sk_buff *skb, u16 vlan,
                 int pkt_length, struct vxge_hw_ring_rxd_info *ext_info)
{

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                        ring->ndev->name, __func__, __LINE__);
        skb_record_rx_queue(skb, ring->driver_id);
        skb->protocol = eth_type_trans(skb, ring->ndev);

        u64_stats_update_begin(&ring->stats.syncp);
        ring->stats.rx_frms++;
        ring->stats.rx_bytes += pkt_length;

        if (skb->pkt_type == PACKET_MULTICAST)
                ring->stats.rx_mcast++;
        u64_stats_update_end(&ring->stats.syncp);

        vxge_debug_rx(VXGE_TRACE,
                "%s: %s:%d  skb protocol = %d",
                ring->ndev->name, __func__, __LINE__, skb->protocol);

        if (ext_info->vlan &&
            ring->vlan_tag_strip == VXGE_HW_VPATH_RPA_STRIP_VLAN_TAG_ENABLE)
                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ext_info->vlan);
        napi_gro_receive(ring->napi_p, skb);

        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d Exiting...", ring->ndev->name, __func__, __LINE__);
}

static inline void vxge_re_pre_post(void *dtr, struct vxge_ring *ring,
                                    struct vxge_rx_priv *rx_priv)
{
        pci_dma_sync_single_for_device(ring->pdev,
                rx_priv->data_dma, rx_priv->data_size, PCI_DMA_FROMDEVICE);

        vxge_hw_ring_rxd_1b_set(dtr, rx_priv->data_dma, rx_priv->data_size);
        vxge_hw_ring_rxd_pre_post(ring->handle, dtr);
}

static inline void vxge_post(int *dtr_cnt, void **first_dtr,
                             void *post_dtr, struct __vxge_hw_ring *ringh)
{
        int dtr_count = *dtr_cnt;
        if ((*dtr_cnt % VXGE_HW_RXSYNC_FREQ_CNT) == 0) {
                if (*first_dtr)
                        vxge_hw_ring_rxd_post_post_wmb(ringh, *first_dtr);
                *first_dtr = post_dtr;
        } else
                vxge_hw_ring_rxd_post_post(ringh, post_dtr);
        dtr_count++;
        *dtr_cnt = dtr_count;
}

/*
 * vxge_rx_1b_compl
 *
 * If the interrupt is because of a received frame or if the receive ring
 * contains fresh as yet un-processed frames, this function is called.
 */
static enum vxge_hw_status
vxge_rx_1b_compl(struct __vxge_hw_ring *ringh, void *dtr,
                 u8 t_code, void *userdata)
{
        struct vxge_ring *ring = (struct vxge_ring *)userdata;
        struct net_device *dev = ring->ndev;
        unsigned int dma_sizes;
        void *first_dtr = NULL;
        int dtr_cnt = 0;
        int data_size;
        dma_addr_t data_dma;
        int pkt_length;
        struct sk_buff *skb;
        struct vxge_rx_priv *rx_priv;
        struct vxge_hw_ring_rxd_info ext_info;
        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                ring->ndev->name, __func__, __LINE__);

        if (ring->budget <= 0)
                goto out;

        do {
                prefetch((char *)dtr + L1_CACHE_BYTES);
                rx_priv = vxge_hw_ring_rxd_private_get(dtr);
                skb = rx_priv->skb;
                data_size = rx_priv->data_size;
                data_dma = rx_priv->data_dma;
                prefetch(rx_priv->skb_data);

                vxge_debug_rx(VXGE_TRACE,
                        "%s: %s:%d  skb = 0x%p",
                        ring->ndev->name, __func__, __LINE__, skb);

                vxge_hw_ring_rxd_1b_get(ringh, dtr, &dma_sizes);
                pkt_length = dma_sizes;

                pkt_length -= ETH_FCS_LEN;

                vxge_debug_rx(VXGE_TRACE,
                        "%s: %s:%d  Packet Length = %d",
                        ring->ndev->name, __func__, __LINE__, pkt_length);

                vxge_hw_ring_rxd_1b_info_get(ringh, dtr, &ext_info);

                /* check skb validity */
                vxge_assert(skb);

                prefetch((char *)skb + L1_CACHE_BYTES);
                if (unlikely(t_code)) {
                        if (vxge_hw_ring_handle_tcode(ringh, dtr, t_code) !=
                                VXGE_HW_OK) {

                                ring->stats.rx_errors++;
                                vxge_debug_rx(VXGE_TRACE,
                                        "%s: %s :%d Rx T_code is %d",
                                        ring->ndev->name, __func__,
                                        __LINE__, t_code);

                                /* If the t_code is not supported and if the
                                 * t_code is other than 0x5 (unparseable packet
                                 * such as unknown UPV6 header), Drop it !!!
                                 */
                                vxge_re_pre_post(dtr, ring, rx_priv);

                                vxge_post(&dtr_cnt, &first_dtr, dtr, ringh);
                                ring->stats.rx_dropped++;
                                continue;
                        }
                }

                if (pkt_length > VXGE_LL_RX_COPY_THRESHOLD) {
                        if (vxge_rx_alloc(dtr, ring, data_size) != NULL) {
                                if (!vxge_rx_map(dtr, ring)) {
                                        skb_put(skb, pkt_length);

                                        pci_unmap_single(ring->pdev, data_dma,
                                                data_size, PCI_DMA_FROMDEVICE);

                                        vxge_hw_ring_rxd_pre_post(ringh, dtr);
                                        vxge_post(&dtr_cnt, &first_dtr, dtr,
                                                ringh);
                                } else {
                                        dev_kfree_skb(rx_priv->skb);
                                        rx_priv->skb = skb;
                                        rx_priv->data_size = data_size;
                                        vxge_re_pre_post(dtr, ring, rx_priv);

                                        vxge_post(&dtr_cnt, &first_dtr, dtr,
                                                ringh);
                                        ring->stats.rx_dropped++;
                                        break;
                                }
                        } else {
                                vxge_re_pre_post(dtr, ring, rx_priv);

                                vxge_post(&dtr_cnt, &first_dtr, dtr, ringh);
                                ring->stats.rx_dropped++;
                                break;
                        }
                } else {
                        struct sk_buff *skb_up;

                        skb_up = netdev_alloc_skb(dev, pkt_length +
                                VXGE_HW_HEADER_ETHERNET_II_802_3_ALIGN);
                        if (skb_up != NULL) {
                                skb_reserve(skb_up,
                                    VXGE_HW_HEADER_ETHERNET_II_802_3_ALIGN);

                                pci_dma_sync_single_for_cpu(ring->pdev,
                                        data_dma, data_size,
                                        PCI_DMA_FROMDEVICE);

                                vxge_debug_mem(VXGE_TRACE,
                                        "%s: %s:%d  skb_up = %p",
                                        ring->ndev->name, __func__,
                                        __LINE__, skb);
                                memcpy(skb_up->data, skb->data, pkt_length);

                                vxge_re_pre_post(dtr, ring, rx_priv);

                                vxge_post(&dtr_cnt, &first_dtr, dtr,
                                        ringh);
                                /* will netif_rx small SKB instead */
                                skb = skb_up;
                                skb_put(skb, pkt_length);
                        } else {
                                vxge_re_pre_post(dtr, ring, rx_priv);

                                vxge_post(&dtr_cnt, &first_dtr, dtr, ringh);
                                vxge_debug_rx(VXGE_ERR,
                                        "%s: vxge_rx_1b_compl: out of "
                                        "memory", dev->name);
                                ring->stats.skb_alloc_fail++;
                                break;
                        }
                }

                if ((ext_info.proto & VXGE_HW_FRAME_PROTO_TCP_OR_UDP) &&
                    !(ext_info.proto & VXGE_HW_FRAME_PROTO_IP_FRAG) &&
                    (dev->features & NETIF_F_RXCSUM) && /* Offload Rx side CSUM */
                    ext_info.l3_cksum == VXGE_HW_L3_CKSUM_OK &&
                    ext_info.l4_cksum == VXGE_HW_L4_CKSUM_OK)
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                else
                        skb_checksum_none_assert(skb);


                if (ring->rx_hwts) {
                        struct skb_shared_hwtstamps *skb_hwts;
                        u32 ns = *(u32 *)(skb->head + pkt_length);

                        skb_hwts = skb_hwtstamps(skb);
                        skb_hwts->hwtstamp = ns_to_ktime(ns);
                }

                /* rth_hash_type and rth_it_hit are non-zero regardless of
                 * whether rss is enabled.  Only the rth_value is zero/non-zero
                 * if rss is disabled/enabled, so key off of that.
                 */
                if (ext_info.rth_value)
                        skb_set_hash(skb, ext_info.rth_value,
                                     PKT_HASH_TYPE_L3);

                vxge_rx_complete(ring, skb, ext_info.vlan,
                        pkt_length, &ext_info);

                ring->budget--;
                ring->pkts_processed++;
                if (!ring->budget)
                        break;

        } while (vxge_hw_ring_rxd_next_completed(ringh, &dtr,
                &t_code) == VXGE_HW_OK);

        if (first_dtr)
                vxge_hw_ring_rxd_post_post_wmb(ringh, first_dtr);

out:
        vxge_debug_entryexit(VXGE_TRACE,
                                "%s:%d  Exiting...",
                                __func__, __LINE__);
        return VXGE_HW_OK;
}

/*
 * vxge_xmit_compl
 *
 * If an interrupt was raised to indicate DMA complete of the Tx packet,
 * this function is called. It identifies the last TxD whose buffer was
 * freed and frees all skbs whose data have already DMA'ed into the NICs
 * internal memory.
 */
static enum vxge_hw_status
vxge_xmit_compl(struct __vxge_hw_fifo *fifo_hw, void *dtr,
                enum vxge_hw_fifo_tcode t_code, void *userdata,
                struct sk_buff ***skb_ptr, int nr_skb, int *more)
{
        struct vxge_fifo *fifo = (struct vxge_fifo *)userdata;
        struct sk_buff *skb, **done_skb = *skb_ptr;
        int pkt_cnt = 0;

        vxge_debug_entryexit(VXGE_TRACE,
                "%s:%d Entered....", __func__, __LINE__);

        do {
                int frg_cnt;
                skb_frag_t *frag;
                int i = 0, j;
                struct vxge_tx_priv *txd_priv =
                        vxge_hw_fifo_txdl_private_get(dtr);

                skb = txd_priv->skb;
                frg_cnt = skb_shinfo(skb)->nr_frags;
                frag = &skb_shinfo(skb)->frags[0];

                vxge_debug_tx(VXGE_TRACE,
                                "%s: %s:%d fifo_hw = %p dtr = %p "
                                "tcode = 0x%x", fifo->ndev->name, __func__,
                                __LINE__, fifo_hw, dtr, t_code);
                /* check skb validity */
                vxge_assert(skb);
                vxge_debug_tx(VXGE_TRACE,
                        "%s: %s:%d skb = %p itxd_priv = %p frg_cnt = %d",
                        fifo->ndev->name, __func__, __LINE__,
                        skb, txd_priv, frg_cnt);
                if (unlikely(t_code)) {
                        fifo->stats.tx_errors++;
                        vxge_debug_tx(VXGE_ERR,
                                "%s: tx: dtr %p completed due to "
                                "error t_code %01x", fifo->ndev->name,
                                dtr, t_code);
                        vxge_hw_fifo_handle_tcode(fifo_hw, dtr, t_code);
                }

                /*  for unfragmented skb */
                pci_unmap_single(fifo->pdev, txd_priv->dma_buffers[i++],
                                skb_headlen(skb), PCI_DMA_TODEVICE);

                for (j = 0; j < frg_cnt; j++) {
                        pci_unmap_page(fifo->pdev,
                                        txd_priv->dma_buffers[i++],
                                        skb_frag_size(frag), PCI_DMA_TODEVICE);
                        frag += 1;
                }

                vxge_hw_fifo_txdl_free(fifo_hw, dtr);

                /* Updating the statistics block */
                u64_stats_update_begin(&fifo->stats.syncp);
                fifo->stats.tx_frms++;
                fifo->stats.tx_bytes += skb->len;
                u64_stats_update_end(&fifo->stats.syncp);

                *done_skb++ = skb;

                if (--nr_skb <= 0) {
                        *more = 1;
                        break;
                }

                pkt_cnt++;
                if (pkt_cnt > fifo->indicate_max_pkts)
                        break;

        } while (vxge_hw_fifo_txdl_next_completed(fifo_hw,
                                &dtr, &t_code) == VXGE_HW_OK);

        *skb_ptr = done_skb;
        if (netif_tx_queue_stopped(fifo->txq))
                netif_tx_wake_queue(fifo->txq);

        vxge_debug_entryexit(VXGE_TRACE,
                                "%s: %s:%d  Exiting...",
                                fifo->ndev->name, __func__, __LINE__);
        return VXGE_HW_OK;
}

/* select a vpath to transmit the packet */
static u32 vxge_get_vpath_no(struct vxgedev *vdev, struct sk_buff *skb)
{
        u16 queue_len, counter = 0;
        if (skb->protocol == htons(ETH_P_IP)) {
                struct iphdr *ip;
                struct tcphdr *th;

                ip = ip_hdr(skb);

                if (!ip_is_fragment(ip)) {
                        th = (struct tcphdr *)(((unsigned char *)ip) +
                                        ip->ihl*4);

                        queue_len = vdev->no_of_vpath;
                        counter = (ntohs(th->source) +
                                ntohs(th->dest)) &
                                vdev->vpath_selector[queue_len - 1];
                        if (counter >= queue_len)
                                counter = queue_len - 1;
                }
        }
        return counter;
}

static enum vxge_hw_status vxge_search_mac_addr_in_list(
        struct vxge_vpath *vpath, u64 del_mac)
{
        struct list_head *entry, *next;
        list_for_each_safe(entry, next, &vpath->mac_addr_list) {
                if (((struct vxge_mac_addrs *)entry)->macaddr == del_mac)
                        return TRUE;
        }
        return FALSE;
}

static int vxge_mac_list_add(struct vxge_vpath *vpath, struct macInfo *mac)
{
        struct vxge_mac_addrs *new_mac_entry;
        u8 *mac_address = NULL;

        if (vpath->mac_addr_cnt >= VXGE_MAX_LEARN_MAC_ADDR_CNT)
                return TRUE;

        new_mac_entry = kzalloc(sizeof(struct vxge_mac_addrs), GFP_ATOMIC);
        if (!new_mac_entry) {
                vxge_debug_mem(VXGE_ERR,
                        "%s: memory allocation failed",
                        VXGE_DRIVER_NAME);
                return FALSE;
        }

        list_add(&new_mac_entry->item, &vpath->mac_addr_list);

        /* Copy the new mac address to the list */
        mac_address = (u8 *)&new_mac_entry->macaddr;
        memcpy(mac_address, mac->macaddr, ETH_ALEN);

        new_mac_entry->state = mac->state;
        vpath->mac_addr_cnt++;

        if (is_multicast_ether_addr(mac->macaddr))
                vpath->mcast_addr_cnt++;

        return TRUE;
}

/* Add a mac address to DA table */
static enum vxge_hw_status
vxge_add_mac_addr(struct vxgedev *vdev, struct macInfo *mac)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_vpath *vpath;
        enum vxge_hw_vpath_mac_addr_add_mode duplicate_mode;

        if (is_multicast_ether_addr(mac->macaddr))
                duplicate_mode = VXGE_HW_VPATH_MAC_ADDR_ADD_DUPLICATE;
        else
                duplicate_mode = VXGE_HW_VPATH_MAC_ADDR_REPLACE_DUPLICATE;

        vpath = &vdev->vpaths[mac->vpath_no];
        status = vxge_hw_vpath_mac_addr_add(vpath->handle, mac->macaddr,
                                                mac->macmask, duplicate_mode);
        if (status != VXGE_HW_OK) {
                vxge_debug_init(VXGE_ERR,
                        "DA config add entry failed for vpath:%d",
                        vpath->device_id);
        } else
                if (FALSE == vxge_mac_list_add(vpath, mac))
                        status = -EPERM;

        return status;
}

static int vxge_learn_mac(struct vxgedev *vdev, u8 *mac_header)
{
        struct macInfo mac_info;
        u8 *mac_address = NULL;
        u64 mac_addr = 0, vpath_vector = 0;
        int vpath_idx = 0;
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_vpath *vpath = NULL;

        mac_address = (u8 *)&mac_addr;
        memcpy(mac_address, mac_header, ETH_ALEN);

        /* Is this mac address already in the list? */
        for (vpath_idx = 0; vpath_idx < vdev->no_of_vpath; vpath_idx++) {
                vpath = &vdev->vpaths[vpath_idx];
                if (vxge_search_mac_addr_in_list(vpath, mac_addr))
                        return vpath_idx;
        }

        memset(&mac_info, 0, sizeof(struct macInfo));
        memcpy(mac_info.macaddr, mac_header, ETH_ALEN);

        /* Any vpath has room to add mac address to its da table? */
        for (vpath_idx = 0; vpath_idx < vdev->no_of_vpath; vpath_idx++) {
                vpath = &vdev->vpaths[vpath_idx];
                if (vpath->mac_addr_cnt < vpath->max_mac_addr_cnt) {
                        /* Add this mac address to this vpath */
                        mac_info.vpath_no = vpath_idx;
                        mac_info.state = VXGE_LL_MAC_ADDR_IN_DA_TABLE;
                        status = vxge_add_mac_addr(vdev, &mac_info);
                        if (status != VXGE_HW_OK)
                                return -EPERM;
                        return vpath_idx;
                }
        }

        mac_info.state = VXGE_LL_MAC_ADDR_IN_LIST;
        vpath_idx = 0;
        mac_info.vpath_no = vpath_idx;
        /* Is the first vpath already selected as catch-basin ? */
        vpath = &vdev->vpaths[vpath_idx];
        if (vpath->mac_addr_cnt > vpath->max_mac_addr_cnt) {
                /* Add this mac address to this vpath */
                if (FALSE == vxge_mac_list_add(vpath, &mac_info))
                        return -EPERM;
                return vpath_idx;
        }

        /* Select first vpath as catch-basin */
        vpath_vector = vxge_mBIT(vpath->device_id);
        status = vxge_hw_mgmt_reg_write(vpath->vdev->devh,
                                vxge_hw_mgmt_reg_type_mrpcim,
                                0,
                                (ulong)offsetof(
                                        struct vxge_hw_mrpcim_reg,
                                        rts_mgr_cbasin_cfg),
                                vpath_vector);
        if (status != VXGE_HW_OK) {
                vxge_debug_tx(VXGE_ERR,
                        "%s: Unable to set the vpath-%d in catch-basin mode",
                        VXGE_DRIVER_NAME, vpath->device_id);
                return -EPERM;
        }

        if (FALSE == vxge_mac_list_add(vpath, &mac_info))
                return -EPERM;

        return vpath_idx;
}

/**
 * vxge_xmit
 * @skb : the socket buffer containing the Tx data.
 * @dev : device pointer.
 *
 * This function is the Tx entry point of the driver. Neterion NIC supports
 * certain protocol assist features on Tx side, namely  CSO, S/G, LSO.
*/
static netdev_tx_t
vxge_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct vxge_fifo *fifo = NULL;
        void *dtr_priv;
        void *dtr = NULL;
        struct vxgedev *vdev = NULL;
        enum vxge_hw_status status;
        int frg_cnt, first_frg_len;
        skb_frag_t *frag;
        int i = 0, j = 0, avail;
        u64 dma_pointer;
        struct vxge_tx_priv *txdl_priv = NULL;
        struct __vxge_hw_fifo *fifo_hw;
        int offload_type;
        int vpath_no = 0;

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                        dev->name, __func__, __LINE__);

        /* A buffer with no data will be dropped */
        if (unlikely(skb->len <= 0)) {
                vxge_debug_tx(VXGE_ERR,
                        "%s: Buffer has no data..", dev->name);
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        vdev = netdev_priv(dev);

        if (unlikely(!is_vxge_card_up(vdev))) {
                vxge_debug_tx(VXGE_ERR,
                        "%s: vdev not initialized", dev->name);
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (vdev->config.addr_learn_en) {
                vpath_no = vxge_learn_mac(vdev, skb->data + ETH_ALEN);
                if (vpath_no == -EPERM) {
                        vxge_debug_tx(VXGE_ERR,
                                "%s: Failed to store the mac address",
                                dev->name);
                        dev_kfree_skb_any(skb);
                        return NETDEV_TX_OK;
                }
        }

        if (vdev->config.tx_steering_type == TX_MULTIQ_STEERING)
                vpath_no = skb_get_queue_mapping(skb);
        else if (vdev->config.tx_steering_type == TX_PORT_STEERING)
                vpath_no = vxge_get_vpath_no(vdev, skb);

        vxge_debug_tx(VXGE_TRACE, "%s: vpath_no= %d", dev->name, vpath_no);

        if (vpath_no >= vdev->no_of_vpath)
                vpath_no = 0;

        fifo = &vdev->vpaths[vpath_no].fifo;
        fifo_hw = fifo->handle;

        if (netif_tx_queue_stopped(fifo->txq))
                return NETDEV_TX_BUSY;

        avail = vxge_hw_fifo_free_txdl_count_get(fifo_hw);
        if (avail == 0) {
                vxge_debug_tx(VXGE_ERR,
                        "%s: No free TXDs available", dev->name);
                fifo->stats.txd_not_free++;
                goto _exit0;
        }

        /* Last TXD?  Stop tx queue to avoid dropping packets.  TX
         * completion will resume the queue.
         */
        if (avail == 1)
                netif_tx_stop_queue(fifo->txq);

        status = vxge_hw_fifo_txdl_reserve(fifo_hw, &dtr, &dtr_priv);
        if (unlikely(status != VXGE_HW_OK)) {
                vxge_debug_tx(VXGE_ERR,
                   "%s: Out of descriptors .", dev->name);
                fifo->stats.txd_out_of_desc++;
                goto _exit0;
        }

        vxge_debug_tx(VXGE_TRACE,
                "%s: %s:%d fifo_hw = %p dtr = %p dtr_priv = %p",
                dev->name, __func__, __LINE__,
                fifo_hw, dtr, dtr_priv);

        if (skb_vlan_tag_present(skb)) {
                u16 vlan_tag = skb_vlan_tag_get(skb);
                vxge_hw_fifo_txdl_vlan_set(dtr, vlan_tag);
        }

        first_frg_len = skb_headlen(skb);

        dma_pointer = pci_map_single(fifo->pdev, skb->data, first_frg_len,
                                PCI_DMA_TODEVICE);

        if (unlikely(pci_dma_mapping_error(fifo->pdev, dma_pointer))) {
                vxge_hw_fifo_txdl_free(fifo_hw, dtr);
                fifo->stats.pci_map_fail++;
                goto _exit0;
        }

        txdl_priv = vxge_hw_fifo_txdl_private_get(dtr);
        txdl_priv->skb = skb;
        txdl_priv->dma_buffers[j] = dma_pointer;

        frg_cnt = skb_shinfo(skb)->nr_frags;
        vxge_debug_tx(VXGE_TRACE,
                        "%s: %s:%d skb = %p txdl_priv = %p "
                        "frag_cnt = %d dma_pointer = 0x%llx", dev->name,
                        __func__, __LINE__, skb, txdl_priv,
                        frg_cnt, (unsigned long long)dma_pointer);

        vxge_hw_fifo_txdl_buffer_set(fifo_hw, dtr, j++, dma_pointer,
                first_frg_len);

        frag = &skb_shinfo(skb)->frags[0];
        for (i = 0; i < frg_cnt; i++) {
                /* ignore 0 length fragment */
                if (!skb_frag_size(frag))
                        continue;

                dma_pointer = (u64)skb_frag_dma_map(&fifo->pdev->dev, frag,
                                                    0, skb_frag_size(frag),
                                                    DMA_TO_DEVICE);

                if (unlikely(dma_mapping_error(&fifo->pdev->dev, dma_pointer)))
                        goto _exit2;
                vxge_debug_tx(VXGE_TRACE,
                        "%s: %s:%d frag = %d dma_pointer = 0x%llx",
                                dev->name, __func__, __LINE__, i,
                                (unsigned long long)dma_pointer);

                txdl_priv->dma_buffers[j] = dma_pointer;
                vxge_hw_fifo_txdl_buffer_set(fifo_hw, dtr, j++, dma_pointer,
                                        skb_frag_size(frag));
                frag += 1;
        }

        offload_type = vxge_offload_type(skb);

        if (offload_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) {
                int mss = vxge_tcp_mss(skb);
                if (mss) {
                        vxge_debug_tx(VXGE_TRACE, "%s: %s:%d mss = %d",
                                dev->name, __func__, __LINE__, mss);
                        vxge_hw_fifo_txdl_mss_set(dtr, mss);
                } else {
                        vxge_assert(skb->len <=
                                dev->mtu + VXGE_HW_MAC_HEADER_MAX_SIZE);
                        vxge_assert(0);
                        goto _exit1;
                }
        }

        if (skb->ip_summed == CHECKSUM_PARTIAL)
                vxge_hw_fifo_txdl_cksum_set_bits(dtr,
                                        VXGE_HW_FIFO_TXD_TX_CKO_IPV4_EN |
                                        VXGE_HW_FIFO_TXD_TX_CKO_TCP_EN |
                                        VXGE_HW_FIFO_TXD_TX_CKO_UDP_EN);

        vxge_hw_fifo_txdl_post(fifo_hw, dtr);

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d  Exiting...",
                dev->name, __func__, __LINE__);
        return NETDEV_TX_OK;

_exit2:
        vxge_debug_tx(VXGE_TRACE, "%s: pci_map_page failed", dev->name);
_exit1:
        j = 0;
        frag = &skb_shinfo(skb)->frags[0];

        pci_unmap_single(fifo->pdev, txdl_priv->dma_buffers[j++],
                        skb_headlen(skb), PCI_DMA_TODEVICE);

        for (; j < i; j++) {
                pci_unmap_page(fifo->pdev, txdl_priv->dma_buffers[j],
                        skb_frag_size(frag), PCI_DMA_TODEVICE);
                frag += 1;
        }

        vxge_hw_fifo_txdl_free(fifo_hw, dtr);
_exit0:
        netif_tx_stop_queue(fifo->txq);
        dev_kfree_skb_any(skb);

        return NETDEV_TX_OK;
}

/*
 * vxge_rx_term
 *
 * Function will be called by hw function to abort all outstanding receive

 * descriptors.
 */
static void
vxge_rx_term(void *dtrh, enum vxge_hw_rxd_state state, void *userdata)
{
        struct vxge_ring *ring = (struct vxge_ring *)userdata;
        struct vxge_rx_priv *rx_priv =
                vxge_hw_ring_rxd_private_get(dtrh);

        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                        ring->ndev->name, __func__, __LINE__);
        if (state != VXGE_HW_RXD_STATE_POSTED)
                return;

        pci_unmap_single(ring->pdev, rx_priv->data_dma,
                rx_priv->data_size, PCI_DMA_FROMDEVICE);

        dev_kfree_skb(rx_priv->skb);
        rx_priv->skb_data = NULL;

        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d  Exiting...",
                ring->ndev->name, __func__, __LINE__);
}

/*
 * vxge_tx_term
 *
 * Function will be called to abort all outstanding tx descriptors
 */
static void
vxge_tx_term(void *dtrh, enum vxge_hw_txdl_state state, void *userdata)
{
        struct vxge_fifo *fifo = (struct vxge_fifo *)userdata;
        skb_frag_t *frag;
        int i = 0, j, frg_cnt;
        struct vxge_tx_priv *txd_priv = vxge_hw_fifo_txdl_private_get(dtrh);
        struct sk_buff *skb = txd_priv->skb;

        vxge_debug_entryexit(VXGE_TRACE, "%s:%d", __func__, __LINE__);

        if (state != VXGE_HW_TXDL_STATE_POSTED)
                return;

        /* check skb validity */
        vxge_assert(skb);
        frg_cnt = skb_shinfo(skb)->nr_frags;
        frag = &skb_shinfo(skb)->frags[0];

        /*  for unfragmented skb */
        pci_unmap_single(fifo->pdev, txd_priv->dma_buffers[i++],
                skb_headlen(skb), PCI_DMA_TODEVICE);

        for (j = 0; j < frg_cnt; j++) {
                pci_unmap_page(fifo->pdev, txd_priv->dma_buffers[i++],
                               skb_frag_size(frag), PCI_DMA_TODEVICE);
                frag += 1;
        }

        dev_kfree_skb(skb);

        vxge_debug_entryexit(VXGE_TRACE,
                "%s:%d  Exiting...", __func__, __LINE__);
}

static int vxge_mac_list_del(struct vxge_vpath *vpath, struct macInfo *mac)
{
        struct list_head *entry, *next;
        u64 del_mac = 0;
        u8 *mac_address = (u8 *) (&del_mac);

        /* Copy the mac address to delete from the list */
        memcpy(mac_address, mac->macaddr, ETH_ALEN);

        list_for_each_safe(entry, next, &vpath->mac_addr_list) {
                if (((struct vxge_mac_addrs *)entry)->macaddr == del_mac) {
                        list_del(entry);
                        kfree((struct vxge_mac_addrs *)entry);
                        vpath->mac_addr_cnt--;

                        if (is_multicast_ether_addr(mac->macaddr))
                                vpath->mcast_addr_cnt--;
                        return TRUE;
                }
        }

        return FALSE;
}

/* delete a mac address from DA table */
static enum vxge_hw_status
vxge_del_mac_addr(struct vxgedev *vdev, struct macInfo *mac)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_vpath *vpath;

        vpath = &vdev->vpaths[mac->vpath_no];
        status = vxge_hw_vpath_mac_addr_delete(vpath->handle, mac->macaddr,
                                                mac->macmask);
        if (status != VXGE_HW_OK) {
                vxge_debug_init(VXGE_ERR,
                        "DA config delete entry failed for vpath:%d",
                        vpath->device_id);
        } else
                vxge_mac_list_del(vpath, mac);
        return status;
}

/**
 * vxge_set_multicast
 * @dev: pointer to the device structure
 *
 * Entry point for multicast address enable/disable
 * This function is a driver entry point which gets called by the kernel
 * whenever multicast addresses must be enabled/disabled. This also gets
 * called to set/reset promiscuous mode. Depending on the deivce flag, we
 * determine, if multicast address must be enabled or if promiscuous mode
 * is to be disabled etc.
 */
static void vxge_set_multicast(struct net_device *dev)
{
        struct netdev_hw_addr *ha;
        struct vxgedev *vdev;
        int i, mcast_cnt = 0;
        struct __vxge_hw_device *hldev;
        struct vxge_vpath *vpath;
        enum vxge_hw_status status = VXGE_HW_OK;
        struct macInfo mac_info;
        int vpath_idx = 0;
        struct vxge_mac_addrs *mac_entry;
        struct list_head *list_head;
        struct list_head *entry, *next;
        u8 *mac_address = NULL;

        vxge_debug_entryexit(VXGE_TRACE,
                "%s:%d", __func__, __LINE__);

        vdev = netdev_priv(dev);
        hldev = vdev->devh;

        if (unlikely(!is_vxge_card_up(vdev)))
                return;

        if ((dev->flags & IFF_ALLMULTI) && (!vdev->all_multi_flg)) {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        vxge_assert(vpath->is_open);
                        status = vxge_hw_vpath_mcast_enable(vpath->handle);
                        if (status != VXGE_HW_OK)
                                vxge_debug_init(VXGE_ERR, "failed to enable "
                                                "multicast, status %d", status);
                        vdev->all_multi_flg = 1;
                }
        } else if (!(dev->flags & IFF_ALLMULTI) && (vdev->all_multi_flg)) {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        vxge_assert(vpath->is_open);
                        status = vxge_hw_vpath_mcast_disable(vpath->handle);
                        if (status != VXGE_HW_OK)
                                vxge_debug_init(VXGE_ERR, "failed to disable "
                                                "multicast, status %d", status);
                        vdev->all_multi_flg = 0;
                }
        }


        if (!vdev->config.addr_learn_en) {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        vxge_assert(vpath->is_open);

                        if (dev->flags & IFF_PROMISC)
                                status = vxge_hw_vpath_promisc_enable(
                                        vpath->handle);
                        else
                                status = vxge_hw_vpath_promisc_disable(
                                        vpath->handle);
                        if (status != VXGE_HW_OK)
                                vxge_debug_init(VXGE_ERR, "failed to %s promisc"
                                        ", status %d", dev->flags&IFF_PROMISC ?
                                        "enable" : "disable", status);
                }
        }

        memset(&mac_info, 0, sizeof(struct macInfo));
        /* Update individual M_CAST address list */
        if ((!vdev->all_multi_flg) && netdev_mc_count(dev)) {
                mcast_cnt = vdev->vpaths[0].mcast_addr_cnt;
                list_head = &vdev->vpaths[0].mac_addr_list;
                if ((netdev_mc_count(dev) +
                        (vdev->vpaths[0].mac_addr_cnt - mcast_cnt)) >
                                vdev->vpaths[0].max_mac_addr_cnt)
                        goto _set_all_mcast;

                /* Delete previous MC's */
                for (i = 0; i < mcast_cnt; i++) {
                        list_for_each_safe(entry, next, list_head) {
                                mac_entry = (struct vxge_mac_addrs *)entry;
                                /* Copy the mac address to delete */
                                mac_address = (u8 *)&mac_entry->macaddr;
                                memcpy(mac_info.macaddr, mac_address, ETH_ALEN);

                                if (is_multicast_ether_addr(mac_info.macaddr)) {
                                        for (vpath_idx = 0; vpath_idx <
                                                vdev->no_of_vpath;
                                                vpath_idx++) {
                                                mac_info.vpath_no = vpath_idx;
                                                status = vxge_del_mac_addr(
                                                                vdev,
                                                                &mac_info);
                                        }
                                }
                        }
                }

                /* Add new ones */
                netdev_for_each_mc_addr(ha, dev) {
                        memcpy(mac_info.macaddr, ha->addr, ETH_ALEN);
                        for (vpath_idx = 0; vpath_idx < vdev->no_of_vpath;
                                        vpath_idx++) {
                                mac_info.vpath_no = vpath_idx;
                                mac_info.state = VXGE_LL_MAC_ADDR_IN_DA_TABLE;
                                status = vxge_add_mac_addr(vdev, &mac_info);
                                if (status != VXGE_HW_OK) {
                                        vxge_debug_init(VXGE_ERR,
                                                "%s:%d Setting individual"
                                                "multicast address failed",
                                                __func__, __LINE__);
                                        goto _set_all_mcast;
                                }
                        }
                }

                return;
_set_all_mcast:
                mcast_cnt = vdev->vpaths[0].mcast_addr_cnt;
                /* Delete previous MC's */
                for (i = 0; i < mcast_cnt; i++) {
                        list_for_each_safe(entry, next, list_head) {
                                mac_entry = (struct vxge_mac_addrs *)entry;
                                /* Copy the mac address to delete */
                                mac_address = (u8 *)&mac_entry->macaddr;
                                memcpy(mac_info.macaddr, mac_address, ETH_ALEN);

                                if (is_multicast_ether_addr(mac_info.macaddr))
                                        break;
                        }

                        for (vpath_idx = 0; vpath_idx < vdev->no_of_vpath;
                                        vpath_idx++) {
                                mac_info.vpath_no = vpath_idx;
                                status = vxge_del_mac_addr(vdev, &mac_info);
                        }
                }

                /* Enable all multicast */
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        vxge_assert(vpath->is_open);

                        status = vxge_hw_vpath_mcast_enable(vpath->handle);
                        if (status != VXGE_HW_OK) {
                                vxge_debug_init(VXGE_ERR,
                                        "%s:%d Enabling all multicasts failed",
                                         __func__, __LINE__);
                        }
                        vdev->all_multi_flg = 1;
                }
                dev->flags |= IFF_ALLMULTI;
        }

        vxge_debug_entryexit(VXGE_TRACE,
                "%s:%d  Exiting...", __func__, __LINE__);
}

/**
 * vxge_set_mac_addr
 * @dev: pointer to the device structure
 *
 * Update entry "0" (default MAC addr)
 */
static int vxge_set_mac_addr(struct net_device *dev, void *p)
{
        struct sockaddr *addr = p;
        struct vxgedev *vdev;
        struct __vxge_hw_device *hldev;
        enum vxge_hw_status status = VXGE_HW_OK;
        struct macInfo mac_info_new, mac_info_old;
        int vpath_idx = 0;

        vxge_debug_entryexit(VXGE_TRACE, "%s:%d", __func__, __LINE__);

        vdev = netdev_priv(dev);
        hldev = vdev->devh;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EINVAL;

        memset(&mac_info_new, 0, sizeof(struct macInfo));
        memset(&mac_info_old, 0, sizeof(struct macInfo));

        vxge_debug_entryexit(VXGE_TRACE, "%s:%d  Exiting...",
                __func__, __LINE__);

        /* Get the old address */
        memcpy(mac_info_old.macaddr, dev->dev_addr, dev->addr_len);

        /* Copy the new address */
        memcpy(mac_info_new.macaddr, addr->sa_data, dev->addr_len);

        /* First delete the old mac address from all the vpaths
        as we can't specify the index while adding new mac address */
        for (vpath_idx = 0; vpath_idx < vdev->no_of_vpath; vpath_idx++) {
                struct vxge_vpath *vpath = &vdev->vpaths[vpath_idx];
                if (!vpath->is_open) {
                        /* This can happen when this interface is added/removed
                        to the bonding interface. Delete this station address
                        from the linked list */
                        vxge_mac_list_del(vpath, &mac_info_old);

                        /* Add this new address to the linked list
                        for later restoring */
                        vxge_mac_list_add(vpath, &mac_info_new);

                        continue;
                }
                /* Delete the station address */
                mac_info_old.vpath_no = vpath_idx;
                status = vxge_del_mac_addr(vdev, &mac_info_old);
        }

        if (unlikely(!is_vxge_card_up(vdev))) {
                memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
                return VXGE_HW_OK;
        }

        /* Set this mac address to all the vpaths */
        for (vpath_idx = 0; vpath_idx < vdev->no_of_vpath; vpath_idx++) {
                mac_info_new.vpath_no = vpath_idx;
                mac_info_new.state = VXGE_LL_MAC_ADDR_IN_DA_TABLE;
                status = vxge_add_mac_addr(vdev, &mac_info_new);
                if (status != VXGE_HW_OK)
                        return -EINVAL;
        }

        memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

        return status;
}

/*
 * vxge_vpath_intr_enable
 * @vdev: pointer to vdev
 * @vp_id: vpath for which to enable the interrupts
 *
 * Enables the interrupts for the vpath
*/
static void vxge_vpath_intr_enable(struct vxgedev *vdev, int vp_id)
{
        struct vxge_vpath *vpath = &vdev->vpaths[vp_id];
        int msix_id = 0;
        int tim_msix_id[4] = {0, 1, 0, 0};
        int alarm_msix_id = VXGE_ALARM_MSIX_ID;

        vxge_hw_vpath_intr_enable(vpath->handle);

        if (vdev->config.intr_type == INTA)
                vxge_hw_vpath_inta_unmask_tx_rx(vpath->handle);
        else {
                vxge_hw_vpath_msix_set(vpath->handle, tim_msix_id,
                        alarm_msix_id);

                msix_id = vpath->device_id * VXGE_HW_VPATH_MSIX_ACTIVE;
                vxge_hw_vpath_msix_unmask(vpath->handle, msix_id);
                vxge_hw_vpath_msix_unmask(vpath->handle, msix_id + 1);

                /* enable the alarm vector */
                msix_id = (vpath->handle->vpath->hldev->first_vp_id *
                        VXGE_HW_VPATH_MSIX_ACTIVE) + alarm_msix_id;
                vxge_hw_vpath_msix_unmask(vpath->handle, msix_id);
        }
}

/*
 * vxge_vpath_intr_disable
 * @vdev: pointer to vdev
 * @vp_id: vpath for which to disable the interrupts
 *
 * Disables the interrupts for the vpath
*/
static void vxge_vpath_intr_disable(struct vxgedev *vdev, int vp_id)
{
        struct vxge_vpath *vpath = &vdev->vpaths[vp_id];
        struct __vxge_hw_device *hldev;
        int msix_id;

        hldev = pci_get_drvdata(vdev->pdev);

        vxge_hw_vpath_wait_receive_idle(hldev, vpath->device_id);

        vxge_hw_vpath_intr_disable(vpath->handle);

        if (vdev->config.intr_type == INTA)
                vxge_hw_vpath_inta_mask_tx_rx(vpath->handle);
        else {
                msix_id = vpath->device_id * VXGE_HW_VPATH_MSIX_ACTIVE;
                vxge_hw_vpath_msix_mask(vpath->handle, msix_id);
                vxge_hw_vpath_msix_mask(vpath->handle, msix_id + 1);

                /* disable the alarm vector */
                msix_id = (vpath->handle->vpath->hldev->first_vp_id *
                        VXGE_HW_VPATH_MSIX_ACTIVE) + VXGE_ALARM_MSIX_ID;
                vxge_hw_vpath_msix_mask(vpath->handle, msix_id);
        }
}

/* list all mac addresses from DA table */
static enum vxge_hw_status
vxge_search_mac_addr_in_da_table(struct vxge_vpath *vpath, struct macInfo *mac)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        unsigned char macmask[ETH_ALEN];
        unsigned char macaddr[ETH_ALEN];

        status = vxge_hw_vpath_mac_addr_get(vpath->handle,
                                macaddr, macmask);
        if (status != VXGE_HW_OK) {
                vxge_debug_init(VXGE_ERR,
                        "DA config list entry failed for vpath:%d",
                        vpath->device_id);
                return status;
        }

        while (!ether_addr_equal(mac->macaddr, macaddr)) {
                status = vxge_hw_vpath_mac_addr_get_next(vpath->handle,
                                macaddr, macmask);
                if (status != VXGE_HW_OK)
                        break;
        }

        return status;
}

/* Store all mac addresses from the list to the DA table */
static enum vxge_hw_status vxge_restore_vpath_mac_addr(struct vxge_vpath *vpath)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct macInfo mac_info;
        u8 *mac_address = NULL;
        struct list_head *entry, *next;

        memset(&mac_info, 0, sizeof(struct macInfo));

        if (vpath->is_open) {
                list_for_each_safe(entry, next, &vpath->mac_addr_list) {
                        mac_address =
                                (u8 *)&
                                ((struct vxge_mac_addrs *)entry)->macaddr;
                        memcpy(mac_info.macaddr, mac_address, ETH_ALEN);
                        ((struct vxge_mac_addrs *)entry)->state =
                                VXGE_LL_MAC_ADDR_IN_DA_TABLE;
                        /* does this mac address already exist in da table? */
                        status = vxge_search_mac_addr_in_da_table(vpath,
                                &mac_info);
                        if (status != VXGE_HW_OK) {
                                /* Add this mac address to the DA table */
                                status = vxge_hw_vpath_mac_addr_add(
                                        vpath->handle, mac_info.macaddr,
                                        mac_info.macmask,
                                    VXGE_HW_VPATH_MAC_ADDR_ADD_DUPLICATE);
                                if (status != VXGE_HW_OK) {
                                        vxge_debug_init(VXGE_ERR,
                                            "DA add entry failed for vpath:%d",
                                            vpath->device_id);
                                        ((struct vxge_mac_addrs *)entry)->state
                                                = VXGE_LL_MAC_ADDR_IN_LIST;
                                }
                        }
                }
        }

        return status;
}

/* Store all vlan ids from the list to the vid table */
static enum vxge_hw_status
vxge_restore_vpath_vid_table(struct vxge_vpath *vpath)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxgedev *vdev = vpath->vdev;
        u16 vid;

        if (!vpath->is_open)
                return status;

        for_each_set_bit(vid, vdev->active_vlans, VLAN_N_VID)
                status = vxge_hw_vpath_vid_add(vpath->handle, vid);

        return status;
}

/*
 * vxge_reset_vpath
 * @vdev: pointer to vdev
 * @vp_id: vpath to reset
 *
 * Resets the vpath
*/
static int vxge_reset_vpath(struct vxgedev *vdev, int vp_id)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_vpath *vpath = &vdev->vpaths[vp_id];
        int ret = 0;

        /* check if device is down already */
        if (unlikely(!is_vxge_card_up(vdev)))
                return 0;

        /* is device reset already scheduled */
        if (test_bit(__VXGE_STATE_RESET_CARD, &vdev->state))
                return 0;

        if (vpath->handle) {
                if (vxge_hw_vpath_reset(vpath->handle) == VXGE_HW_OK) {
                        if (is_vxge_card_up(vdev) &&
                                vxge_hw_vpath_recover_from_reset(vpath->handle)
                                        != VXGE_HW_OK) {
                                vxge_debug_init(VXGE_ERR,
                                        "vxge_hw_vpath_recover_from_reset"
                                        "failed for vpath:%d", vp_id);
                                return status;
                        }
                } else {
                        vxge_debug_init(VXGE_ERR,
                                "vxge_hw_vpath_reset failed for"
                                "vpath:%d", vp_id);
                                return status;
                }
        } else
                return VXGE_HW_FAIL;

        vxge_restore_vpath_mac_addr(vpath);
        vxge_restore_vpath_vid_table(vpath);

        /* Enable all broadcast */
        vxge_hw_vpath_bcast_enable(vpath->handle);

        /* Enable all multicast */
        if (vdev->all_multi_flg) {
                status = vxge_hw_vpath_mcast_enable(vpath->handle);
                if (status != VXGE_HW_OK)
                        vxge_debug_init(VXGE_ERR,
                                "%s:%d Enabling multicast failed",
                                __func__, __LINE__);
        }

        /* Enable the interrupts */
        vxge_vpath_intr_enable(vdev, vp_id);

        smp_wmb();

        /* Enable the flow of traffic through the vpath */
        vxge_hw_vpath_enable(vpath->handle);

        smp_wmb();
        vxge_hw_vpath_rx_doorbell_init(vpath->handle);
        vpath->ring.last_status = VXGE_HW_OK;

        /* Vpath reset done */
        clear_bit(vp_id, &vdev->vp_reset);

        /* Start the vpath queue */
        if (netif_tx_queue_stopped(vpath->fifo.txq))
                netif_tx_wake_queue(vpath->fifo.txq);

        return ret;
}

/* Configure CI */
static void vxge_config_ci_for_tti_rti(struct vxgedev *vdev)
{
        int i = 0;

        /* Enable CI for RTI */
        if (vdev->config.intr_type == MSI_X) {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        struct __vxge_hw_ring *hw_ring;

                        hw_ring = vdev->vpaths[i].ring.handle;
                        vxge_hw_vpath_dynamic_rti_ci_set(hw_ring);
                }
        }

        /* Enable CI for TTI */
        for (i = 0; i < vdev->no_of_vpath; i++) {
                struct __vxge_hw_fifo *hw_fifo = vdev->vpaths[i].fifo.handle;
                vxge_hw_vpath_tti_ci_set(hw_fifo);
                /*
                 * For Inta (with or without napi), Set CI ON for only one
                 * vpath. (Have only one free running timer).
                 */
                if ((vdev->config.intr_type == INTA) && (i == 0))
                        break;
        }

        return;
}

static int do_vxge_reset(struct vxgedev *vdev, int event)
{
        enum vxge_hw_status status;
        int ret = 0, vp_id, i;

        vxge_debug_entryexit(VXGE_TRACE, "%s:%d", __func__, __LINE__);

        if ((event == VXGE_LL_FULL_RESET) || (event == VXGE_LL_START_RESET)) {
                /* check if device is down already */
                if (unlikely(!is_vxge_card_up(vdev)))
                        return 0;

                /* is reset already scheduled */
                if (test_and_set_bit(__VXGE_STATE_RESET_CARD, &vdev->state))
                        return 0;
        }

        if (event == VXGE_LL_FULL_RESET) {
                netif_carrier_off(vdev->ndev);

                /* wait for all the vpath reset to complete */
                for (vp_id = 0; vp_id < vdev->no_of_vpath; vp_id++) {
                        while (test_bit(vp_id, &vdev->vp_reset))
                                msleep(50);
                }

                netif_carrier_on(vdev->ndev);

                /* if execution mode is set to debug, don't reset the adapter */
                if (unlikely(vdev->exec_mode)) {
                        vxge_debug_init(VXGE_ERR,
                                "%s: execution mode is debug, returning..",
                                vdev->ndev->name);
                        clear_bit(__VXGE_STATE_CARD_UP, &vdev->state);
                        netif_tx_stop_all_queues(vdev->ndev);
                        return 0;
                }
        }

        if (event == VXGE_LL_FULL_RESET) {
                vxge_hw_device_wait_receive_idle(vdev->devh);
                vxge_hw_device_intr_disable(vdev->devh);

                switch (vdev->cric_err_event) {
                case VXGE_HW_EVENT_UNKNOWN:
                        netif_tx_stop_all_queues(vdev->ndev);
                        vxge_debug_init(VXGE_ERR,
                                "fatal: %s: Disabling device due to"
                                "unknown error",
                                vdev->ndev->name);
                        ret = -EPERM;
                        goto out;
                case VXGE_HW_EVENT_RESET_START:
                        break;
                case VXGE_HW_EVENT_RESET_COMPLETE:
                case VXGE_HW_EVENT_LINK_DOWN:
                case VXGE_HW_EVENT_LINK_UP:
                case VXGE_HW_EVENT_ALARM_CLEARED:
                case VXGE_HW_EVENT_ECCERR:
                case VXGE_HW_EVENT_MRPCIM_ECCERR:
                        ret = -EPERM;
                        goto out;
                case VXGE_HW_EVENT_FIFO_ERR:
                case VXGE_HW_EVENT_VPATH_ERR:
                        break;
                case VXGE_HW_EVENT_CRITICAL_ERR:
                        netif_tx_stop_all_queues(vdev->ndev);
                        vxge_debug_init(VXGE_ERR,
                                "fatal: %s: Disabling device due to"
                                "serious error",
                                vdev->ndev->name);
                        /* SOP or device reset required */
                        /* This event is not currently used */
                        ret = -EPERM;
                        goto out;
                case VXGE_HW_EVENT_SERR:
                        netif_tx_stop_all_queues(vdev->ndev);
                        vxge_debug_init(VXGE_ERR,
                                "fatal: %s: Disabling device due to"
                                "serious error",
                                vdev->ndev->name);
                        ret = -EPERM;
                        goto out;
                case VXGE_HW_EVENT_SRPCIM_SERR:
                case VXGE_HW_EVENT_MRPCIM_SERR:
                        ret = -EPERM;
                        goto out;
                case VXGE_HW_EVENT_SLOT_FREEZE:
                        netif_tx_stop_all_queues(vdev->ndev);
                        vxge_debug_init(VXGE_ERR,
                                "fatal: %s: Disabling device due to"
                                "slot freeze",
                                vdev->ndev->name);
                        ret = -EPERM;
                        goto out;
                default:
                        break;

                }
        }

        if ((event == VXGE_LL_FULL_RESET) || (event == VXGE_LL_START_RESET))
                netif_tx_stop_all_queues(vdev->ndev);

        if (event == VXGE_LL_FULL_RESET) {
                status = vxge_reset_all_vpaths(vdev);
                if (status != VXGE_HW_OK) {
                        vxge_debug_init(VXGE_ERR,
                                "fatal: %s: can not reset vpaths",
                                vdev->ndev->name);
                        ret = -EPERM;
                        goto out;
                }
        }

        if (event == VXGE_LL_COMPL_RESET) {
                for (i = 0; i < vdev->no_of_vpath; i++)
                        if (vdev->vpaths[i].handle) {
                                if (vxge_hw_vpath_recover_from_reset(
                                        vdev->vpaths[i].handle)
                                                != VXGE_HW_OK) {
                                        vxge_debug_init(VXGE_ERR,
                                                "vxge_hw_vpath_recover_"
                                                "from_reset failed for vpath: "
                                                "%d", i);
                                        ret = -EPERM;
                                        goto out;
                                }
                                } else {
                                        vxge_debug_init(VXGE_ERR,
                                        "vxge_hw_vpath_reset failed for "
                                                "vpath:%d", i);
                                        ret = -EPERM;
                                        goto out;
                                }
        }

        if ((event == VXGE_LL_FULL_RESET) || (event == VXGE_LL_COMPL_RESET)) {
                /* Reprogram the DA table with populated mac addresses */
                for (vp_id = 0; vp_id < vdev->no_of_vpath; vp_id++) {
                        vxge_restore_vpath_mac_addr(&vdev->vpaths[vp_id]);
                        vxge_restore_vpath_vid_table(&vdev->vpaths[vp_id]);
                }

                /* enable vpath interrupts */
                for (i = 0; i < vdev->no_of_vpath; i++)
                        vxge_vpath_intr_enable(vdev, i);

                vxge_hw_device_intr_enable(vdev->devh);

                smp_wmb();

                /* Indicate card up */
                set_bit(__VXGE_STATE_CARD_UP, &vdev->state);

                /* Get the traffic to flow through the vpaths */
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vxge_hw_vpath_enable(vdev->vpaths[i].handle);
                        smp_wmb();
                        vxge_hw_vpath_rx_doorbell_init(vdev->vpaths[i].handle);
                }

                netif_tx_wake_all_queues(vdev->ndev);
        }

        /* configure CI */
        vxge_config_ci_for_tti_rti(vdev);

out:
        vxge_debug_entryexit(VXGE_TRACE,
                "%s:%d  Exiting...", __func__, __LINE__);

        /* Indicate reset done */
        if ((event == VXGE_LL_FULL_RESET) || (event == VXGE_LL_COMPL_RESET))
                clear_bit(__VXGE_STATE_RESET_CARD, &vdev->state);
        return ret;
}

/*
 * vxge_reset
 * @vdev: pointer to ll device
 *
 * driver may reset the chip on events of serr, eccerr, etc
 */
static void vxge_reset(struct work_struct *work)
{
        struct vxgedev *vdev = container_of(work, struct vxgedev, reset_task);

        if (!netif_running(vdev->ndev))
                return;

        do_vxge_reset(vdev, VXGE_LL_FULL_RESET);
}

/**
 * vxge_poll - Receive handler when Receive Polling is used.
 * @dev: pointer to the device structure.
 * @budget: Number of packets budgeted to be processed in this iteration.
 *
 * This function comes into picture only if Receive side is being handled
 * through polling (called NAPI in linux). It mostly does what the normal
 * Rx interrupt handler does in terms of descriptor and packet processing
 * but not in an interrupt context. Also it will process a specified number
 * of packets at most in one iteration. This value is passed down by the
 * kernel as the function argument 'budget'.
 */
static int vxge_poll_msix(struct napi_struct *napi, int budget)
{
        struct vxge_ring *ring = container_of(napi, struct vxge_ring, napi);
        int pkts_processed;
        int budget_org = budget;

        ring->budget = budget;
        ring->pkts_processed = 0;
        vxge_hw_vpath_poll_rx(ring->handle);
        pkts_processed = ring->pkts_processed;

        if (ring->pkts_processed < budget_org) {
                napi_complete(napi);

                /* Re enable the Rx interrupts for the vpath */
                vxge_hw_channel_msix_unmask(
                                (struct __vxge_hw_channel *)ring->handle,
                                ring->rx_vector_no);
                mmiowb();
        }

        /* We are copying and returning the local variable, in case if after
         * clearing the msix interrupt above, if the interrupt fires right
         * away which can preempt this NAPI thread */
        return pkts_processed;
}

static int vxge_poll_inta(struct napi_struct *napi, int budget)
{
        struct vxgedev *vdev = container_of(napi, struct vxgedev, napi);
        int pkts_processed = 0;
        int i;
        int budget_org = budget;
        struct vxge_ring *ring;

        struct __vxge_hw_device *hldev = pci_get_drvdata(vdev->pdev);

        for (i = 0; i < vdev->no_of_vpath; i++) {
                ring = &vdev->vpaths[i].ring;
                ring->budget = budget;
                ring->pkts_processed = 0;
                vxge_hw_vpath_poll_rx(ring->handle);
                pkts_processed += ring->pkts_processed;
                budget -= ring->pkts_processed;
                if (budget <= 0)
                        break;
        }

        VXGE_COMPLETE_ALL_TX(vdev);

        if (pkts_processed < budget_org) {
                napi_complete(napi);
                /* Re enable the Rx interrupts for the ring */
                vxge_hw_device_unmask_all(hldev);
                vxge_hw_device_flush_io(hldev);
        }

        return pkts_processed;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/**
 * vxge_netpoll - netpoll event handler entry point
 * @dev : pointer to the device structure.
 * Description:
 *      This function will be called by upper layer to check for events on the
 * interface in situations where interrupts are disabled. It is used for
 * specific in-kernel networking tasks, such as remote consoles and kernel
 * debugging over the network (example netdump in RedHat).
 */
static void vxge_netpoll(struct net_device *dev)
{
        struct vxgedev *vdev = netdev_priv(dev);
        struct pci_dev *pdev = vdev->pdev;
        struct __vxge_hw_device *hldev = pci_get_drvdata(pdev);
        const int irq = pdev->irq;

        vxge_debug_entryexit(VXGE_TRACE, "%s:%d", __func__, __LINE__);

        if (pci_channel_offline(pdev))
                return;

        disable_irq(irq);
        vxge_hw_device_clear_tx_rx(hldev);

        vxge_hw_device_clear_tx_rx(hldev);
        VXGE_COMPLETE_ALL_RX(vdev);
        VXGE_COMPLETE_ALL_TX(vdev);

        enable_irq(irq);

        vxge_debug_entryexit(VXGE_TRACE,
                "%s:%d  Exiting...", __func__, __LINE__);
}
#endif

/* RTH configuration */
static enum vxge_hw_status vxge_rth_configure(struct vxgedev *vdev)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_hw_rth_hash_types hash_types;
        u8 itable[256] = {0}; /* indirection table */
        u8 mtable[256] = {0}; /* CPU to vpath mapping  */
        int index;

        /*
         * Filling
         *      - itable with bucket numbers
         *      - mtable with bucket-to-vpath mapping
         */
        for (index = 0; index < (1 << vdev->config.rth_bkt_sz); index++) {
                itable[index] = index;
                mtable[index] = index % vdev->no_of_vpath;
        }

        /* set indirection table, bucket-to-vpath mapping */
        status = vxge_hw_vpath_rts_rth_itable_set(vdev->vp_handles,
                                                vdev->no_of_vpath,
                                                mtable, itable,
                                                vdev->config.rth_bkt_sz);
        if (status != VXGE_HW_OK) {
                vxge_debug_init(VXGE_ERR,
                        "RTH indirection table configuration failed "
                        "for vpath:%d", vdev->vpaths[0].device_id);
                return status;
        }

        /* Fill RTH hash types */
        hash_types.hash_type_tcpipv4_en   = vdev->config.rth_hash_type_tcpipv4;
        hash_types.hash_type_ipv4_en      = vdev->config.rth_hash_type_ipv4;
        hash_types.hash_type_tcpipv6_en   = vdev->config.rth_hash_type_tcpipv6;
        hash_types.hash_type_ipv6_en      = vdev->config.rth_hash_type_ipv6;
        hash_types.hash_type_tcpipv6ex_en =
                                        vdev->config.rth_hash_type_tcpipv6ex;
        hash_types.hash_type_ipv6ex_en    = vdev->config.rth_hash_type_ipv6ex;

        /*
         * Because the itable_set() method uses the active_table field
         * for the target virtual path the RTH config should be updated
         * for all VPATHs. The h/w only uses the lowest numbered VPATH
         * when steering frames.
         */
         for (index = 0; index < vdev->no_of_vpath; index++) {
                status = vxge_hw_vpath_rts_rth_set(
                                vdev->vpaths[index].handle,
                                vdev->config.rth_algorithm,
                                &hash_types,
                                vdev->config.rth_bkt_sz);
                 if (status != VXGE_HW_OK) {
                        vxge_debug_init(VXGE_ERR,
                                "RTH configuration failed for vpath:%d",
                                vdev->vpaths[index].device_id);
                        return status;
                 }
         }

        return status;
}

/* reset vpaths */
static enum vxge_hw_status vxge_reset_all_vpaths(struct vxgedev *vdev)
{
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_vpath *vpath;
        int i;

        for (i = 0; i < vdev->no_of_vpath; i++) {
                vpath = &vdev->vpaths[i];
                if (vpath->handle) {
                        if (vxge_hw_vpath_reset(vpath->handle) == VXGE_HW_OK) {
                                if (is_vxge_card_up(vdev) &&
                                        vxge_hw_vpath_recover_from_reset(
                                                vpath->handle) != VXGE_HW_OK) {
                                        vxge_debug_init(VXGE_ERR,
                                                "vxge_hw_vpath_recover_"
                                                "from_reset failed for vpath: "
                                                "%d", i);
                                        return status;
                                }
                        } else {
                                vxge_debug_init(VXGE_ERR,
                                        "vxge_hw_vpath_reset failed for "
                                        "vpath:%d", i);
                                        return status;
                        }
                }

        }

        return status;
}

/* close vpaths */
static void vxge_close_vpaths(struct vxgedev *vdev, int index)
{
        struct vxge_vpath *vpath;
        int i;

        for (i = index; i < vdev->no_of_vpath; i++) {
                vpath = &vdev->vpaths[i];

                if (vpath->handle && vpath->is_open) {
                        vxge_hw_vpath_close(vpath->handle);
                        vdev->stats.vpaths_open--;
                }
                vpath->is_open = 0;
                vpath->handle = NULL;
        }
}

/* open vpaths */
static int vxge_open_vpaths(struct vxgedev *vdev)
{
        struct vxge_hw_vpath_attr attr;
        enum vxge_hw_status status;
        struct vxge_vpath *vpath;
        u32 vp_id = 0;
        int i;

        for (i = 0; i < vdev->no_of_vpath; i++) {
                vpath = &vdev->vpaths[i];
                vxge_assert(vpath->is_configured);

                if (!vdev->titan1) {
                        struct vxge_hw_vp_config *vcfg;
                        vcfg = &vdev->devh->config.vp_config[vpath->device_id];

                        vcfg->rti.urange_a = RTI_T1A_RX_URANGE_A;
                        vcfg->rti.urange_b = RTI_T1A_RX_URANGE_B;
                        vcfg->rti.urange_c = RTI_T1A_RX_URANGE_C;
                        vcfg->tti.uec_a = TTI_T1A_TX_UFC_A;
                        vcfg->tti.uec_b = TTI_T1A_TX_UFC_B;
                        vcfg->tti.uec_c = TTI_T1A_TX_UFC_C(vdev->mtu);
                        vcfg->tti.uec_d = TTI_T1A_TX_UFC_D(vdev->mtu);
                        vcfg->tti.ltimer_val = VXGE_T1A_TTI_LTIMER_VAL;
                        vcfg->tti.rtimer_val = VXGE_T1A_TTI_RTIMER_VAL;
                }

                attr.vp_id = vpath->device_id;
                attr.fifo_attr.callback = vxge_xmit_compl;
                attr.fifo_attr.txdl_term = vxge_tx_term;
                attr.fifo_attr.per_txdl_space = sizeof(struct vxge_tx_priv);
                attr.fifo_attr.userdata = &vpath->fifo;

                attr.ring_attr.callback = vxge_rx_1b_compl;
                attr.ring_attr.rxd_init = vxge_rx_initial_replenish;
                attr.ring_attr.rxd_term = vxge_rx_term;
                attr.ring_attr.per_rxd_space = sizeof(struct vxge_rx_priv);
                attr.ring_attr.userdata = &vpath->ring;

                vpath->ring.ndev = vdev->ndev;
                vpath->ring.pdev = vdev->pdev;

                status = vxge_hw_vpath_open(vdev->devh, &attr, &vpath->handle);
                if (status == VXGE_HW_OK) {
                        vpath->fifo.handle =
                            (struct __vxge_hw_fifo *)attr.fifo_attr.userdata;
                        vpath->ring.handle =
                            (struct __vxge_hw_ring *)attr.ring_attr.userdata;
                        vpath->fifo.tx_steering_type =
                                vdev->config.tx_steering_type;
                        vpath->fifo.ndev = vdev->ndev;
                        vpath->fifo.pdev = vdev->pdev;

                        u64_stats_init(&vpath->fifo.stats.syncp);
                        u64_stats_init(&vpath->ring.stats.syncp);

                        if (vdev->config.tx_steering_type)
                                vpath->fifo.txq =
                                        netdev_get_tx_queue(vdev->ndev, i);
                        else
                                vpath->fifo.txq =
                                        netdev_get_tx_queue(vdev->ndev, 0);
                        vpath->fifo.indicate_max_pkts =
                                vdev->config.fifo_indicate_max_pkts;
                        vpath->fifo.tx_vector_no = 0;
                        vpath->ring.rx_vector_no = 0;
                        vpath->ring.rx_hwts = vdev->rx_hwts;
                        vpath->is_open = 1;
                        vdev->vp_handles[i] = vpath->handle;
                        vpath->ring.vlan_tag_strip = vdev->vlan_tag_strip;
                        vdev->stats.vpaths_open++;
                } else {
                        vdev->stats.vpath_open_fail++;
                        vxge_debug_init(VXGE_ERR, "%s: vpath: %d failed to "
                                        "open with status: %d",
                                        vdev->ndev->name, vpath->device_id,
                                        status);
                        vxge_close_vpaths(vdev, 0);
                        return -EPERM;
                }

                vp_id = vpath->handle->vpath->vp_id;
                vdev->vpaths_deployed |= vxge_mBIT(vp_id);
        }

        return VXGE_HW_OK;
}

/**
 *  adaptive_coalesce_tx_interrupts - Changes the interrupt coalescing
 *  if the interrupts are not within a range
 *  @fifo: pointer to transmit fifo structure
 *  Description: The function changes boundary timer and restriction timer
 *  value depends on the traffic
 *  Return Value: None
 */
static void adaptive_coalesce_tx_interrupts(struct vxge_fifo *fifo)
{
        fifo->interrupt_count++;
        if (time_before(fifo->jiffies + HZ / 100, jiffies)) {
                struct __vxge_hw_fifo *hw_fifo = fifo->handle;

                fifo->jiffies = jiffies;
                if (fifo->interrupt_count > VXGE_T1A_MAX_TX_INTERRUPT_COUNT &&
                    hw_fifo->rtimer != VXGE_TTI_RTIMER_ADAPT_VAL) {
                        hw_fifo->rtimer = VXGE_TTI_RTIMER_ADAPT_VAL;
                        vxge_hw_vpath_dynamic_tti_rtimer_set(hw_fifo);
                } else if (hw_fifo->rtimer != 0) {
                        hw_fifo->rtimer = 0;
                        vxge_hw_vpath_dynamic_tti_rtimer_set(hw_fifo);
                }
                fifo->interrupt_count = 0;
        }
}

/**
 *  adaptive_coalesce_rx_interrupts - Changes the interrupt coalescing
 *  if the interrupts are not within a range
 *  @ring: pointer to receive ring structure
 *  Description: The function increases of decreases the packet counts within
 *  the ranges of traffic utilization, if the interrupts due to this ring are
 *  not within a fixed range.
 *  Return Value: Nothing
 */
static void adaptive_coalesce_rx_interrupts(struct vxge_ring *ring)
{
        ring->interrupt_count++;
        if (time_before(ring->jiffies + HZ / 100, jiffies)) {
                struct __vxge_hw_ring *hw_ring = ring->handle;

                ring->jiffies = jiffies;
                if (ring->interrupt_count > VXGE_T1A_MAX_INTERRUPT_COUNT &&
                    hw_ring->rtimer != VXGE_RTI_RTIMER_ADAPT_VAL) {
                        hw_ring->rtimer = VXGE_RTI_RTIMER_ADAPT_VAL;
                        vxge_hw_vpath_dynamic_rti_rtimer_set(hw_ring);
                } else if (hw_ring->rtimer != 0) {
                        hw_ring->rtimer = 0;
                        vxge_hw_vpath_dynamic_rti_rtimer_set(hw_ring);
                }
                ring->interrupt_count = 0;
        }
}

/*
 *  vxge_isr_napi
 *  @irq: the irq of the device.
 *  @dev_id: a void pointer to the hldev structure of the Titan device
 *  @ptregs: pointer to the registers pushed on the stack.
 *
 *  This function is the ISR handler of the device when napi is enabled. It
 *  identifies the reason for the interrupt and calls the relevant service
 *  routines.
 */
static irqreturn_t vxge_isr_napi(int irq, void *dev_id)
{
        struct net_device *dev;
        struct __vxge_hw_device *hldev;
        u64 reason;
        enum vxge_hw_status status;
        struct vxgedev *vdev = (struct vxgedev *)dev_id;

        vxge_debug_intr(VXGE_TRACE, "%s:%d", __func__, __LINE__);

        dev = vdev->ndev;
        hldev = pci_get_drvdata(vdev->pdev);

        if (pci_channel_offline(vdev->pdev))
                return IRQ_NONE;

        if (unlikely(!is_vxge_card_up(vdev)))
                return IRQ_HANDLED;

        status = vxge_hw_device_begin_irq(hldev, vdev->exec_mode, &reason);
        if (status == VXGE_HW_OK) {
                vxge_hw_device_mask_all(hldev);

                if (reason &
                        VXGE_HW_TITAN_GENERAL_INT_STATUS_VPATH_TRAFFIC_INT(
                        vdev->vpaths_deployed >>
                        (64 - VXGE_HW_MAX_VIRTUAL_PATHS))) {

                        vxge_hw_device_clear_tx_rx(hldev);
                        napi_schedule(&vdev->napi);
                        vxge_debug_intr(VXGE_TRACE,
                                "%s:%d  Exiting...", __func__, __LINE__);
                        return IRQ_HANDLED;
                } else
                        vxge_hw_device_unmask_all(hldev);
        } else if (unlikely((status == VXGE_HW_ERR_VPATH) ||
                (status == VXGE_HW_ERR_CRITICAL) ||
                (status == VXGE_HW_ERR_FIFO))) {
                vxge_hw_device_mask_all(hldev);
                vxge_hw_device_flush_io(hldev);
                return IRQ_HANDLED;
        } else if (unlikely(status == VXGE_HW_ERR_SLOT_FREEZE))
                return IRQ_HANDLED;

        vxge_debug_intr(VXGE_TRACE, "%s:%d  Exiting...", __func__, __LINE__);
        return IRQ_NONE;
}

static irqreturn_t vxge_tx_msix_handle(int irq, void *dev_id)
{
        struct vxge_fifo *fifo = (struct vxge_fifo *)dev_id;

        adaptive_coalesce_tx_interrupts(fifo);

        vxge_hw_channel_msix_mask((struct __vxge_hw_channel *)fifo->handle,
                                  fifo->tx_vector_no);

        vxge_hw_channel_msix_clear((struct __vxge_hw_channel *)fifo->handle,
                                   fifo->tx_vector_no);

        VXGE_COMPLETE_VPATH_TX(fifo);

        vxge_hw_channel_msix_unmask((struct __vxge_hw_channel *)fifo->handle,
                                    fifo->tx_vector_no);

        mmiowb();

        return IRQ_HANDLED;
}

static irqreturn_t vxge_rx_msix_napi_handle(int irq, void *dev_id)
{
        struct vxge_ring *ring = (struct vxge_ring *)dev_id;

        adaptive_coalesce_rx_interrupts(ring);

        vxge_hw_channel_msix_mask((struct __vxge_hw_channel *)ring->handle,
                                  ring->rx_vector_no);

        vxge_hw_channel_msix_clear((struct __vxge_hw_channel *)ring->handle,
                                   ring->rx_vector_no);

        napi_schedule(&ring->napi);
        return IRQ_HANDLED;
}

static irqreturn_t
vxge_alarm_msix_handle(int irq, void *dev_id)
{
        int i;
        enum vxge_hw_status status;
        struct vxge_vpath *vpath = (struct vxge_vpath *)dev_id;
        struct vxgedev *vdev = vpath->vdev;
        int msix_id = (vpath->handle->vpath->vp_id *
                VXGE_HW_VPATH_MSIX_ACTIVE) + VXGE_ALARM_MSIX_ID;

        for (i = 0; i < vdev->no_of_vpath; i++) {
                /* Reduce the chance of losing alarm interrupts by masking
                 * the vector. A pending bit will be set if an alarm is
                 * generated and on unmask the interrupt will be fired.
                 */
                vxge_hw_vpath_msix_mask(vdev->vpaths[i].handle, msix_id);
                vxge_hw_vpath_msix_clear(vdev->vpaths[i].handle, msix_id);
                mmiowb();

                status = vxge_hw_vpath_alarm_process(vdev->vpaths[i].handle,
                        vdev->exec_mode);
                if (status == VXGE_HW_OK) {
                        vxge_hw_vpath_msix_unmask(vdev->vpaths[i].handle,
                                                  msix_id);
                        mmiowb();
                        continue;
                }
                vxge_debug_intr(VXGE_ERR,
                        "%s: vxge_hw_vpath_alarm_process failed %x ",
                        VXGE_DRIVER_NAME, status);
        }
        return IRQ_HANDLED;
}

static int vxge_alloc_msix(struct vxgedev *vdev)
{
        int j, i, ret = 0;
        int msix_intr_vect = 0, temp;
        vdev->intr_cnt = 0;

start:
        /* Tx/Rx MSIX Vectors count */
        vdev->intr_cnt = vdev->no_of_vpath * 2;

        /* Alarm MSIX Vectors count */
        vdev->intr_cnt++;

        vdev->entries = kcalloc(vdev->intr_cnt, sizeof(struct msix_entry),
                                GFP_KERNEL);
        if (!vdev->entries) {
                vxge_debug_init(VXGE_ERR,
                        "%s: memory allocation failed",
                        VXGE_DRIVER_NAME);
                ret = -ENOMEM;
                goto alloc_entries_failed;
        }

        vdev->vxge_entries = kcalloc(vdev->intr_cnt,
                                     sizeof(struct vxge_msix_entry),
                                     GFP_KERNEL);
        if (!vdev->vxge_entries) {
                vxge_debug_init(VXGE_ERR, "%s: memory allocation failed",
                        VXGE_DRIVER_NAME);
                ret = -ENOMEM;
                goto alloc_vxge_entries_failed;
        }

        for (i = 0, j = 0; i < vdev->no_of_vpath; i++) {

                msix_intr_vect = i * VXGE_HW_VPATH_MSIX_ACTIVE;

                /* Initialize the fifo vector */
                vdev->entries[j].entry = msix_intr_vect;
                vdev->vxge_entries[j].entry = msix_intr_vect;
                vdev->vxge_entries[j].in_use = 0;
                j++;

                /* Initialize the ring vector */
                vdev->entries[j].entry = msix_intr_vect + 1;
                vdev->vxge_entries[j].entry = msix_intr_vect + 1;
                vdev->vxge_entries[j].in_use = 0;
                j++;
        }

        /* Initialize the alarm vector */
        vdev->entries[j].entry = VXGE_ALARM_MSIX_ID;
        vdev->vxge_entries[j].entry = VXGE_ALARM_MSIX_ID;
        vdev->vxge_entries[j].in_use = 0;

        ret = pci_enable_msix_range(vdev->pdev,
                                    vdev->entries, 3, vdev->intr_cnt);
        if (ret < 0) {
                ret = -ENODEV;
                goto enable_msix_failed;
        } else if (ret < vdev->intr_cnt) {
                pci_disable_msix(vdev->pdev);

                vxge_debug_init(VXGE_ERR,
                        "%s: MSI-X enable failed for %d vectors, ret: %d",
                        VXGE_DRIVER_NAME, vdev->intr_cnt, ret);
                if (max_config_vpath != VXGE_USE_DEFAULT) {
                        ret = -ENODEV;
                        goto enable_msix_failed;
                }

                kfree(vdev->entries);
                kfree(vdev->vxge_entries);
                vdev->entries = NULL;
                vdev->vxge_entries = NULL;
                /* Try with less no of vector by reducing no of vpaths count */
                temp = (ret - 1)/2;
                vxge_close_vpaths(vdev, temp);
                vdev->no_of_vpath = temp;
                goto start;
        }
        return 0;

enable_msix_failed:
        kfree(vdev->vxge_entries);
alloc_vxge_entries_failed:
        kfree(vdev->entries);
alloc_entries_failed:
        return ret;
}

static int vxge_enable_msix(struct vxgedev *vdev)
{

        int i, ret = 0;
        /* 0 - Tx, 1 - Rx  */
        int tim_msix_id[4] = {0, 1, 0, 0};

        vdev->intr_cnt = 0;

        /* allocate msix vectors */
        ret = vxge_alloc_msix(vdev);
        if (!ret) {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        struct vxge_vpath *vpath = &vdev->vpaths[i];

                        /* If fifo or ring are not enabled, the MSIX vector for
                         * it should be set to 0.
                         */
                        vpath->ring.rx_vector_no = (vpath->device_id *
                                                VXGE_HW_VPATH_MSIX_ACTIVE) + 1;

                        vpath->fifo.tx_vector_no = (vpath->device_id *
                                                VXGE_HW_VPATH_MSIX_ACTIVE);

                        vxge_hw_vpath_msix_set(vpath->handle, tim_msix_id,
                                               VXGE_ALARM_MSIX_ID);
                }
        }

        return ret;
}

static void vxge_rem_msix_isr(struct vxgedev *vdev)
{
        int intr_cnt;

        for (intr_cnt = 0; intr_cnt < (vdev->no_of_vpath * 2 + 1);
                intr_cnt++) {
                if (vdev->vxge_entries[intr_cnt].in_use) {
                        synchronize_irq(vdev->entries[intr_cnt].vector);
                        free_irq(vdev->entries[intr_cnt].vector,
                                vdev->vxge_entries[intr_cnt].arg);
                        vdev->vxge_entries[intr_cnt].in_use = 0;
                }
        }

        kfree(vdev->entries);
        kfree(vdev->vxge_entries);
        vdev->entries = NULL;
        vdev->vxge_entries = NULL;

        if (vdev->config.intr_type == MSI_X)
                pci_disable_msix(vdev->pdev);
}

static void vxge_rem_isr(struct vxgedev *vdev)
{
        if (IS_ENABLED(CONFIG_PCI_MSI) &&
            vdev->config.intr_type == MSI_X) {
                vxge_rem_msix_isr(vdev);
        } else if (vdev->config.intr_type == INTA) {
                        synchronize_irq(vdev->pdev->irq);
                        free_irq(vdev->pdev->irq, vdev);
        }
}

static int vxge_add_isr(struct vxgedev *vdev)
{
        int ret = 0;
        int vp_idx = 0, intr_idx = 0, intr_cnt = 0, msix_idx = 0, irq_req = 0;
        int pci_fun = PCI_FUNC(vdev->pdev->devfn);

        if (IS_ENABLED(CONFIG_PCI_MSI) && vdev->config.intr_type == MSI_X)
                ret = vxge_enable_msix(vdev);

        if (ret) {
                vxge_debug_init(VXGE_ERR,
                        "%s: Enabling MSI-X Failed", VXGE_DRIVER_NAME);
                vxge_debug_init(VXGE_ERR,
                        "%s: Defaulting to INTA", VXGE_DRIVER_NAME);
                vdev->config.intr_type = INTA;
        }

        if (IS_ENABLED(CONFIG_PCI_MSI) && vdev->config.intr_type == MSI_X) {
                for (intr_idx = 0;
                     intr_idx < (vdev->no_of_vpath *
                        VXGE_HW_VPATH_MSIX_ACTIVE); intr_idx++) {

                        msix_idx = intr_idx % VXGE_HW_VPATH_MSIX_ACTIVE;
                        irq_req = 0;

                        switch (msix_idx) {
                        case 0:
                                snprintf(vdev->desc[intr_cnt], VXGE_INTR_STRLEN,
                                "%s:vxge:MSI-X %d - Tx - fn:%d vpath:%d",
                                        vdev->ndev->name,
                                        vdev->entries[intr_cnt].entry,
                                        pci_fun, vp_idx);
                                ret = request_irq(
                                    vdev->entries[intr_cnt].vector,
                                        vxge_tx_msix_handle, 0,
                                        vdev->desc[intr_cnt],
                                        &vdev->vpaths[vp_idx].fifo);
                                        vdev->vxge_entries[intr_cnt].arg =
                                                &vdev->vpaths[vp_idx].fifo;
                                irq_req = 1;
                                break;
                        case 1:
                                snprintf(vdev->desc[intr_cnt], VXGE_INTR_STRLEN,
                                "%s:vxge:MSI-X %d - Rx - fn:%d vpath:%d",
                                        vdev->ndev->name,
                                        vdev->entries[intr_cnt].entry,
                                        pci_fun, vp_idx);
                                ret = request_irq(
                                    vdev->entries[intr_cnt].vector,
                                        vxge_rx_msix_napi_handle,
                                        0,
                                        vdev->desc[intr_cnt],
                                        &vdev->vpaths[vp_idx].ring);
                                        vdev->vxge_entries[intr_cnt].arg =
                                                &vdev->vpaths[vp_idx].ring;
                                irq_req = 1;
                                break;
                        }

                        if (ret) {
                                vxge_debug_init(VXGE_ERR,
                                        "%s: MSIX - %d  Registration failed",
                                        vdev->ndev->name, intr_cnt);
                                vxge_rem_msix_isr(vdev);
                                vdev->config.intr_type = INTA;
                                vxge_debug_init(VXGE_ERR,
                                        "%s: Defaulting to INTA"
                                        , vdev->ndev->name);
                                        goto INTA_MODE;
                        }

                        if (irq_req) {
                                /* We requested for this msix interrupt */
                                vdev->vxge_entries[intr_cnt].in_use = 1;
                                msix_idx +=  vdev->vpaths[vp_idx].device_id *
                                        VXGE_HW_VPATH_MSIX_ACTIVE;
                                vxge_hw_vpath_msix_unmask(
                                        vdev->vpaths[vp_idx].handle,
                                        msix_idx);
                                intr_cnt++;
                        }

                        /* Point to next vpath handler */
                        if (((intr_idx + 1) % VXGE_HW_VPATH_MSIX_ACTIVE == 0) &&
                            (vp_idx < (vdev->no_of_vpath - 1)))
                                vp_idx++;
                }

                intr_cnt = vdev->no_of_vpath * 2;
                snprintf(vdev->desc[intr_cnt], VXGE_INTR_STRLEN,
                        "%s:vxge:MSI-X %d - Alarm - fn:%d",
                        vdev->ndev->name,
                        vdev->entries[intr_cnt].entry,
                        pci_fun);
                /* For Alarm interrupts */
                ret = request_irq(vdev->entries[intr_cnt].vector,
                                        vxge_alarm_msix_handle, 0,
                                        vdev->desc[intr_cnt],
                                        &vdev->vpaths[0]);
                if (ret) {
                        vxge_debug_init(VXGE_ERR,
                                "%s: MSIX - %d Registration failed",
                                vdev->ndev->name, intr_cnt);
                        vxge_rem_msix_isr(vdev);
                        vdev->config.intr_type = INTA;
                        vxge_debug_init(VXGE_ERR,
                                "%s: Defaulting to INTA",
                                vdev->ndev->name);
                                goto INTA_MODE;
                }

                msix_idx = (vdev->vpaths[0].handle->vpath->vp_id *
                        VXGE_HW_VPATH_MSIX_ACTIVE) + VXGE_ALARM_MSIX_ID;
                vxge_hw_vpath_msix_unmask(vdev->vpaths[vp_idx].handle,
                                        msix_idx);
                vdev->vxge_entries[intr_cnt].in_use = 1;
                vdev->vxge_entries[intr_cnt].arg = &vdev->vpaths[0];
        }

INTA_MODE:
        if (vdev->config.intr_type == INTA) {
                snprintf(vdev->desc[0], VXGE_INTR_STRLEN,
                        "%s:vxge:INTA", vdev->ndev->name);
                vxge_hw_device_set_intr_type(vdev->devh,
                        VXGE_HW_INTR_MODE_IRQLINE);

                vxge_hw_vpath_tti_ci_set(vdev->vpaths[0].fifo.handle);

                ret = request_irq((int) vdev->pdev->irq,
                        vxge_isr_napi,
                        IRQF_SHARED, vdev->desc[0], vdev);
                if (ret) {
                        vxge_debug_init(VXGE_ERR,
                                "%s %s-%d: ISR registration failed",
                                VXGE_DRIVER_NAME, "IRQ", vdev->pdev->irq);
                        return -ENODEV;
                }
                vxge_debug_init(VXGE_TRACE,
                        "new %s-%d line allocated",
                        "IRQ", vdev->pdev->irq);
        }

        return VXGE_HW_OK;
}

static void vxge_poll_vp_reset(unsigned long data)
{
        struct vxgedev *vdev = (struct vxgedev *)data;
        int i, j = 0;

        for (i = 0; i < vdev->no_of_vpath; i++) {
                if (test_bit(i, &vdev->vp_reset)) {
                        vxge_reset_vpath(vdev, i);
                        j++;
                }
        }
        if (j && (vdev->config.intr_type != MSI_X)) {
                vxge_hw_device_unmask_all(vdev->devh);
                vxge_hw_device_flush_io(vdev->devh);
        }

        mod_timer(&vdev->vp_reset_timer, jiffies + HZ / 2);
}

static void vxge_poll_vp_lockup(unsigned long data)
{
        struct vxgedev *vdev = (struct vxgedev *)data;
        enum vxge_hw_status status = VXGE_HW_OK;
        struct vxge_vpath *vpath;
        struct vxge_ring *ring;
        int i;
        unsigned long rx_frms;

        for (i = 0; i < vdev->no_of_vpath; i++) {
                ring = &vdev->vpaths[i].ring;

                /* Truncated to machine word size number of frames */
                rx_frms = ACCESS_ONCE(ring->stats.rx_frms);

                /* Did this vpath received any packets */
                if (ring->stats.prev_rx_frms == rx_frms) {
                        status = vxge_hw_vpath_check_leak(ring->handle);

                        /* Did it received any packets last time */
                        if ((VXGE_HW_FAIL == status) &&
                                (VXGE_HW_FAIL == ring->last_status)) {

                                /* schedule vpath reset */
                                if (!test_and_set_bit(i, &vdev->vp_reset)) {
                                        vpath = &vdev->vpaths[i];

                                        /* disable interrupts for this vpath */
                                        vxge_vpath_intr_disable(vdev, i);

                                        /* stop the queue for this vpath */
                                        netif_tx_stop_queue(vpath->fifo.txq);
                                        continue;
                                }
                        }
                }
                ring->stats.prev_rx_frms = rx_frms;
                ring->last_status = status;
        }

        /* Check every 1 milli second */
        mod_timer(&vdev->vp_lockup_timer, jiffies + HZ / 1000);
}

static netdev_features_t vxge_fix_features(struct net_device *dev,
        netdev_features_t features)
{
        netdev_features_t changed = dev->features ^ features;

        /* Enabling RTH requires some of the logic in vxge_device_register and a
         * vpath reset.  Due to these restrictions, only allow modification
         * while the interface is down.
         */
        if ((changed & NETIF_F_RXHASH) && netif_running(dev))
                features ^= NETIF_F_RXHASH;

        return features;
}

static int vxge_set_features(struct net_device *dev, netdev_features_t features)
{
        struct vxgedev *vdev = netdev_priv(dev);
        netdev_features_t changed = dev->features ^ features;

        if (!(changed & NETIF_F_RXHASH))
                return 0;

        /* !netif_running() ensured by vxge_fix_features() */

        vdev->devh->config.rth_en = !!(features & NETIF_F_RXHASH);
        if (vxge_reset_all_vpaths(vdev) != VXGE_HW_OK) {
                dev->features = features ^ NETIF_F_RXHASH;
                vdev->devh->config.rth_en = !!(dev->features & NETIF_F_RXHASH);
                return -EIO;
        }

        return 0;
}

/**
 * vxge_open
 * @dev: pointer to the device structure.
 *
 * This function is the open entry point of the driver. It mainly calls a
 * function to allocate Rx buffers and inserts them into the buffer
 * descriptors and then enables the Rx part of the NIC.
 * Return value: '0' on success and an appropriate (-)ve integer as
 * defined in errno.h file on failure.
 */
static int vxge_open(struct net_device *dev)
{
        enum vxge_hw_status status;
        struct vxgedev *vdev;
        struct __vxge_hw_device *hldev;
        struct vxge_vpath *vpath;
        int ret = 0;
        int i;
        u64 val64, function_mode;

        vxge_debug_entryexit(VXGE_TRACE,
                "%s: %s:%d", dev->name, __func__, __LINE__);

        vdev = netdev_priv(dev);
        hldev = pci_get_drvdata(vdev->pdev);
        function_mode = vdev->config.device_hw_info.function_mode;

        /* make sure you have link off by default every time Nic is
         * initialized */
        netif_carrier_off(dev);

        /* Open VPATHs */
        status = vxge_open_vpaths(vdev);
        if (status != VXGE_HW_OK) {
                vxge_debug_init(VXGE_ERR,
                        "%s: fatal: Vpath open failed", vdev->ndev->name);
                ret = -EPERM;
                goto out0;
        }

        vdev->mtu = dev->mtu;

        status = vxge_add_isr(vdev);
        if (status != VXGE_HW_OK) {
                vxge_debug_init(VXGE_ERR,
                        "%s: fatal: ISR add failed", dev->name);
                ret = -EPERM;
                goto out1;
        }

        if (vdev->config.intr_type != MSI_X) {
                netif_napi_add(dev, &vdev->napi, vxge_poll_inta,
                        vdev->config.napi_weight);
                napi_enable(&vdev->napi);
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        vpath->ring.napi_p = &vdev->napi;
                }
        } else {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        netif_napi_add(dev, &vpath->ring.napi,
                            vxge_poll_msix, vdev->config.napi_weight);
                        napi_enable(&vpath->ring.napi);
                        vpath->ring.napi_p = &vpath->ring.napi;
                }
        }

        /* configure RTH */
        if (vdev->config.rth_steering) {
                status = vxge_rth_configure(vdev);
                if (status != VXGE_HW_OK) {
                        vxge_debug_init(VXGE_ERR,
                                "%s: fatal: RTH configuration failed",
                                dev->name);
                        ret = -EPERM;
                        goto out2;
                }
        }
        printk(KERN_INFO "%s: Receive Hashing Offload %s\n", dev->name,
               hldev->config.rth_en ? "enabled" : "disabled");

        for (i = 0; i < vdev->no_of_vpath; i++) {
                vpath = &vdev->vpaths[i];

                /* set initial mtu before enabling the device */
                status = vxge_hw_vpath_mtu_set(vpath->handle, vdev->mtu);
                if (status != VXGE_HW_OK) {
                        vxge_debug_init(VXGE_ERR,
                                "%s: fatal: can not set new MTU", dev->name);
                        ret = -EPERM;
                        goto out2;
                }
        }

        VXGE_DEVICE_DEBUG_LEVEL_SET(VXGE_TRACE, VXGE_COMPONENT_LL, vdev);
        vxge_debug_init(vdev->level_trace,
                "%s: MTU is %d", vdev->ndev->name, vdev->mtu);
        VXGE_DEVICE_DEBUG_LEVEL_SET(VXGE_ERR, VXGE_COMPONENT_LL, vdev);

        /* Restore the DA, VID table and also multicast and promiscuous mode
         * states
         */
        if (vdev->all_multi_flg) {
                for (i = 0; i < vdev->no_of_vpath; i++) {
                        vpath = &vdev->vpaths[i];
                        vxge_restore_vpath_mac_addr(vpath);
                        vxge_restore_vpath_vid_table(vpath);

                        status = vxge_hw_vpath_mcast_enable(vpath->handle);
                        if (status != VXGE_HW_OK)
                                vxge_debug_init(VXGE_ERR,
                                        "%s:%d Enabling multicast failed",
                                        __func__, __LINE__);
                }
        }

        /* Enable vpath to sniff all unicast/multicast traffic that not
         * addressed to them. We allow promiscuous mode for PF only
         */

        val64 = 0;
        for (i = 0; i < VXGE_HW_MAX_VIRTUAL_PATHS; i++)
                val64 |= VXGE_HW_RXMAC_AUTHORIZE_ALL_ADDR_VP(i);

        vxge_hw_mgmt_reg_write(vdev->devh,
                vxge_hw_mgmt_reg_type_mrpcim,
                0,
                (ulong)offsetof(struct vxge_hw_mrpcim_reg,
                        rxmac_authorize_all_addr),
                val64);

        vxge_hw_mgmt_reg_write(vdev->devh,
                vxge_hw_mgmt_reg_type_mrpcim,
                0,
                (ulong)offsetof(struct vxge_hw_mrpcim_reg,
                        rxmac_authorize_all_vid),
                val64);

        vxge_set_multicast(dev);

        /* Enabling Bcast and mcast for all vpath */
        for (i = 0; i < vdev->no_of_vpath; i++) {
                vpath = &vdev->vpaths[i];
                status = vxge_hw_vpath_bcast_enable(vpath->handle);
                if (status != VXGE_HW_OK)
                        vxge_debug_init(VXGE_ERR,
                                "%s : Can not enable bcast for vpath "
                                "id %d", dev->name, i);
                if (vdev->config.addr_learn_en) {
                        status = vxge_hw_vpath_mcast_enable(vpath->handle);
                        if (status != VXGE_HW_OK)
                                vxge_debug_init(VXGE_ERR,
                                        "%s : Can not enable mcast for vpath "
                                        "id %d", dev->name, i);
                }
        }

        vxge_hw_device_setpause_data(vdev->devh, 0,
                vdev->config.tx_pause_enable,
                vdev->config.rx_pause_enable);

        if (vdev->vp_reset_timer.function == NULL)
                vxge_os_timer(&vdev->vp_reset_timer, vxge_poll_vp_reset, vdev,
                              HZ / 2);

        /* There is no need to check for RxD leak and RxD lookup on Titan1A */
        if (vdev->titan1 && vdev->vp_lockup_timer.function == NULL)
                vxge_os_timer(&vdev->vp_lockup_timer, vxge_poll_vp_lockup, vdev,
                              HZ / 2);

        set_bit(__VXGE_STATE_CARD_UP, &vdev->state);

        smp_wmb();

        if (vxge_hw_device_link_state_get(vdev->devh) == VXGE_HW_LINK_UP) {
                netif_carrier_on(vdev->ndev);
                netdev_notice(vdev->ndev, "Link Up\n");
                vdev->stats.link_up++;
        }

        vxge_hw_device_intr_enable(vdev->devh);

        smp_wmb();

        for (i = 0; i < vdev->no_of_vpath; i++) {
                vpath = &vdev->vpaths[i];

                vxge_hw_vpath_enable(vpath->handle);
                smp_wmb();
                vxge_hw_vpath_rx_doorbell_init(vpath->handle);
        }

        netif_tx_start_all_queues(vdev->ndev);

        /* configure CI */
        vxge_config_ci_for_tti_rti(vdev);

        goto out0;

out2:
        vxge_rem_isr(vdev);

        /* Disable napi */
        if (vdev->config.intr_type != MSI_X)
                napi_disable(&vdev->napi);
        else {
                for (i = 0; i < vdev->no_of_vpath; i++)
                        napi_disable(&vdev->vpaths[i].ring.napi);
        }

out1:
        vxge_close_vpaths(vdev, 0);
out0:
        vxge_debug_entryexit(VXGE_TRACE,
                                "%s: %s:%d  Exiting...",
                                dev->name, __func__, __LINE__);
        return ret;
}

/* Loop through the mac address list and delete all the entries */
static void vxge_free_mac_add_list(struct vxge_vpath *vpath)
{

        struct list_head *entry, *next;
        if (list_empty(&vpath->mac_addr_list))
                return;

        list_for_each_safe(entry, next, &vpath->mac_addr_list) {
                list_del(entry);
                kfree((struct vxge_mac_addrs *)entry);
        }
}

static void vxge_napi_del_all(struct vxgedev *vdev)
{
        int i;
        if (vdev->config.intr_type != MSI_X)
                netif_napi_del(&vdev->napi);
        else {
                for (i = 0; i < vdev->no_of_vpath; i++)
                        netif_napi_del(&vdev->vpaths[i].ring.napi);
        }
}

static int do_vxge_close(struct net_device *dev, int do_io)
{
        enum vxge_hw_status status;
        struct vxgedev *vdev;
        struct __vxge_hw_device *hldev;
        int i;
        u64 val64, vpath_vector;
        vxge_debug_entryexit(VXGE_TRACE, "%s: %s:%d",
                dev->name, __func__, __LINE__);

        vdev = netdev_priv(dev);
        hldev = pci_get_drvdata(vdev->pdev);

        if (unlikely(!is_vxge_card_up(vdev)))
                return 0;

        /* If vxge_handle_crit_err task is executing,
         * wait till it completes. */
        while (test_and_set_bit(__VXGE_STATE_RESET_CARD, &vdev->state))
                msleep(50);

        if (do_io) {
                /* Put the vpath back in normal mode */
                vpath_vector = vxge_mBIT(vdev->vpaths[0].device_id);
                status = vxge_hw_mgmt_reg_read(vdev->devh,
                                vxge_hw_mgmt_reg_type_mrpcim,
                                0,
                                (ulong)offsetof(
                                        struct vxge_hw_mrpcim_reg,
                                        rts_mgr_cbasin_cfg),
                                &val64);
                if (status == VXGE_HW_OK) {
                        val64 &= ~vpath_vector;
                        status = vxge_hw_mgmt_reg_write(vdev->devh,
                                        vxge_hw_mgmt_reg_type_mrpcim,
                                        0,
                                        (ulong)offsetof(
                                                struct vxge_hw_mrpcim_reg,
                                                rts_mgr_cbasin_cfg),
                                        val64);
                }

                /* Remove the function 0 from promiscuous mode */
                vxge_hw_mgmt_reg_write(vdev->devh,
                        vxge_hw_mgmt_reg_type_mrpcim,
                        0,
                        (ulong)offsetof(struct vxge_hw_mrpcim_reg,
                                rxmac_authorize_all_addr),
                        0);

                vxge_hw_mgmt_reg_write(vdev->devh,
                        vxge_hw_mgmt_reg_type_mrpcim,
                        0,
                        (ulong)offsetof(struct vxge_hw_mrpcim_reg,
                                rxmac_authorize_all_vid),
                        0);

                smp_wmb();