enic_main.c

Go to the documentation of this file.

/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/ethtool.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/rtnetlink.h>
#include <linux/prefetch.h>
#include <net/ip6_checksum.h>

#include "cq_enet_desc.h"
#include "vnic_dev.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "vnic_vic.h"
#include "enic_res.h"
#include "enic.h"
#include "enic_dev.h"
#include "enic_pp.h"

#define ENIC_NOTIFY_TIMER_PERIOD    (2 * HZ)
#define WQ_ENET_MAX_DESC_LEN        (1 << WQ_ENET_LEN_BITS)
#define MAX_TSO             (1 << 16)
#define ENIC_DESC_MAX_SPLITS        (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)

#define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
#define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
#define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */

/* Supported devices */
static DEFINE_PCI_DEVICE_TABLE(enic_id_table) = {
    { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
    { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
    { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
    { 0, }  /* end of table */
};

MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR("Scott Feldman <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, enic_id_table);

struct enic_stat {
    char name[ETH_GSTRING_LEN];
    unsigned int offset;
};

#define ENIC_TX_STAT(stat)  \
    { .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
#define ENIC_RX_STAT(stat)  \
    { .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }

static const struct enic_stat enic_tx_stats[] = {
    ENIC_TX_STAT(tx_frames_ok),
    ENIC_TX_STAT(tx_unicast_frames_ok),
    ENIC_TX_STAT(tx_multicast_frames_ok),
    ENIC_TX_STAT(tx_broadcast_frames_ok),
    ENIC_TX_STAT(tx_bytes_ok),
    ENIC_TX_STAT(tx_unicast_bytes_ok),
    ENIC_TX_STAT(tx_multicast_bytes_ok),
    ENIC_TX_STAT(tx_broadcast_bytes_ok),
    ENIC_TX_STAT(tx_drops),
    ENIC_TX_STAT(tx_errors),
    ENIC_TX_STAT(tx_tso),
};

static const struct enic_stat enic_rx_stats[] = {
    ENIC_RX_STAT(rx_frames_ok),
    ENIC_RX_STAT(rx_frames_total),
    ENIC_RX_STAT(rx_unicast_frames_ok),
    ENIC_RX_STAT(rx_multicast_frames_ok),
    ENIC_RX_STAT(rx_broadcast_frames_ok),
    ENIC_RX_STAT(rx_bytes_ok),
    ENIC_RX_STAT(rx_unicast_bytes_ok),
    ENIC_RX_STAT(rx_multicast_bytes_ok),
    ENIC_RX_STAT(rx_broadcast_bytes_ok),
    ENIC_RX_STAT(rx_drop),
    ENIC_RX_STAT(rx_no_bufs),
    ENIC_RX_STAT(rx_errors),
    ENIC_RX_STAT(rx_rss),
    ENIC_RX_STAT(rx_crc_errors),
    ENIC_RX_STAT(rx_frames_64),
    ENIC_RX_STAT(rx_frames_127),
    ENIC_RX_STAT(rx_frames_255),
    ENIC_RX_STAT(rx_frames_511),
    ENIC_RX_STAT(rx_frames_1023),
    ENIC_RX_STAT(rx_frames_1518),
    ENIC_RX_STAT(rx_frames_to_max),
};

static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);

int enic_is_dynamic(struct enic *enic)
{
    return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
}

int enic_sriov_enabled(struct enic *enic)
{
    return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
}

static int enic_is_sriov_vf(struct enic *enic)
{
    return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
}

int enic_is_valid_vf(struct enic *enic, int vf)
{
#ifdef CONFIG_PCI_IOV
    return vf >= 0 && vf < enic->num_vfs;
#else
    return 0;
#endif
}

static inline unsigned int enic_cq_rq(struct enic *enic, unsigned int rq)
{
    return rq;
}

static inline unsigned int enic_cq_wq(struct enic *enic, unsigned int wq)
{
    return enic->rq_count + wq;
}

static inline unsigned int enic_legacy_io_intr(void)
{
    return 0;
}

static inline unsigned int enic_legacy_err_intr(void)
{
    return 1;
}

static inline unsigned int enic_legacy_notify_intr(void)
{
    return 2;
}

static inline unsigned int enic_msix_rq_intr(struct enic *enic, unsigned int rq)
{
    return enic->cq[enic_cq_rq(enic, rq)].interrupt_offset;
}

static inline unsigned int enic_msix_wq_intr(struct enic *enic, unsigned int wq)
{
    return enic->cq[enic_cq_wq(enic, wq)].interrupt_offset;
}

static inline unsigned int enic_msix_err_intr(struct enic *enic)
{
    return enic->rq_count + enic->wq_count;
}

static inline unsigned int enic_msix_notify_intr(struct enic *enic)
{
    return enic->rq_count + enic->wq_count + 1;
}

static int enic_get_settings(struct net_device *netdev,
    struct ethtool_cmd *ecmd)
{
    struct enic *enic = netdev_priv(netdev);

    ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
    ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
    ecmd->port = PORT_FIBRE;
    ecmd->transceiver = XCVR_EXTERNAL;

    if (netif_carrier_ok(netdev)) {
        ethtool_cmd_speed_set(ecmd, vnic_dev_port_speed(enic->vdev));
        ecmd->duplex = DUPLEX_FULL;
    } else {
        ethtool_cmd_speed_set(ecmd, -1);
        ecmd->duplex = -1;
    }

    ecmd->autoneg = AUTONEG_DISABLE;

    return 0;
}

static void enic_get_drvinfo(struct net_device *netdev,
    struct ethtool_drvinfo *drvinfo)
{
    struct enic *enic = netdev_priv(netdev);
    struct vnic_devcmd_fw_info *fw_info;

    enic_dev_fw_info(enic, &fw_info);

    strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
    strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
    strlcpy(drvinfo->fw_version, fw_info->fw_version,
        sizeof(drvinfo->fw_version));
    strlcpy(drvinfo->bus_info, pci_name(enic->pdev),
        sizeof(drvinfo->bus_info));
}

static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
{
    unsigned int i;

    switch (stringset) {
    case ETH_SS_STATS:
        for (i = 0; i < enic_n_tx_stats; i++) {
            memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
            data += ETH_GSTRING_LEN;
        }
        for (i = 0; i < enic_n_rx_stats; i++) {
            memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
            data += ETH_GSTRING_LEN;
        }
        break;
    }
}

static int enic_get_sset_count(struct net_device *netdev, int sset)
{
    switch (sset) {
    case ETH_SS_STATS:
        return enic_n_tx_stats + enic_n_rx_stats;
    default:
        return -EOPNOTSUPP;
    }
}

static void enic_get_ethtool_stats(struct net_device *netdev,
    struct ethtool_stats *stats, u64 *data)
{
    struct enic *enic = netdev_priv(netdev);
    struct vnic_stats *vstats;
    unsigned int i;

    enic_dev_stats_dump(enic, &vstats);

    for (i = 0; i < enic_n_tx_stats; i++)
        *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
    for (i = 0; i < enic_n_rx_stats; i++)
        *(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
}

static u32 enic_get_msglevel(struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    return enic->msg_enable;
}

static void enic_set_msglevel(struct net_device *netdev, u32 value)
{
    struct enic *enic = netdev_priv(netdev);
    enic->msg_enable = value;
}

static int enic_get_coalesce(struct net_device *netdev,
    struct ethtool_coalesce *ecmd)
{
    struct enic *enic = netdev_priv(netdev);

    ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
    ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;

    return 0;
}

static int enic_set_coalesce(struct net_device *netdev,
    struct ethtool_coalesce *ecmd)
{
    struct enic *enic = netdev_priv(netdev);
    u32 tx_coalesce_usecs;
    u32 rx_coalesce_usecs;
    unsigned int i, intr;

    tx_coalesce_usecs = min_t(u32, ecmd->tx_coalesce_usecs,
        vnic_dev_get_intr_coal_timer_max(enic->vdev));
    rx_coalesce_usecs = min_t(u32, ecmd->rx_coalesce_usecs,
        vnic_dev_get_intr_coal_timer_max(enic->vdev));

    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    case VNIC_DEV_INTR_MODE_INTX:
        if (tx_coalesce_usecs != rx_coalesce_usecs)
            return -EINVAL;

        intr = enic_legacy_io_intr();
        vnic_intr_coalescing_timer_set(&enic->intr[intr],
            tx_coalesce_usecs);
        break;
    case VNIC_DEV_INTR_MODE_MSI:
        if (tx_coalesce_usecs != rx_coalesce_usecs)
            return -EINVAL;

        vnic_intr_coalescing_timer_set(&enic->intr[0],
            tx_coalesce_usecs);
        break;
    case VNIC_DEV_INTR_MODE_MSIX:
        for (i = 0; i < enic->wq_count; i++) {
            intr = enic_msix_wq_intr(enic, i);
            vnic_intr_coalescing_timer_set(&enic->intr[intr],
                tx_coalesce_usecs);
        }

        for (i = 0; i < enic->rq_count; i++) {
            intr = enic_msix_rq_intr(enic, i);
            vnic_intr_coalescing_timer_set(&enic->intr[intr],
                rx_coalesce_usecs);
        }

        break;
    default:
        break;
    }

    enic->tx_coalesce_usecs = tx_coalesce_usecs;
    enic->rx_coalesce_usecs = rx_coalesce_usecs;

    return 0;
}

static const struct ethtool_ops enic_ethtool_ops = {
    .get_settings = enic_get_settings,
    .get_drvinfo = enic_get_drvinfo,
    .get_msglevel = enic_get_msglevel,
    .set_msglevel = enic_set_msglevel,
    .get_link = ethtool_op_get_link,
    .get_strings = enic_get_strings,
    .get_sset_count = enic_get_sset_count,
    .get_ethtool_stats = enic_get_ethtool_stats,
    .get_coalesce = enic_get_coalesce,
    .set_coalesce = enic_set_coalesce,
};

static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
{
    struct enic *enic = vnic_dev_priv(wq->vdev);

    if (buf->sop)
        pci_unmap_single(enic->pdev, buf->dma_addr,
            buf->len, PCI_DMA_TODEVICE);
    else
        pci_unmap_page(enic->pdev, buf->dma_addr,
            buf->len, PCI_DMA_TODEVICE);

    if (buf->os_buf)
        dev_kfree_skb_any(buf->os_buf);
}

static void enic_wq_free_buf(struct vnic_wq *wq,
    struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
{
    enic_free_wq_buf(wq, buf);
}

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

    spin_lock(&enic->wq_lock[q_number]);

    vnic_wq_service(&enic->wq[q_number], cq_desc,
        completed_index, enic_wq_free_buf,
        opaque);

    if (netif_queue_stopped(enic->netdev) &&
        vnic_wq_desc_avail(&enic->wq[q_number]) >=
        (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
        netif_wake_queue(enic->netdev);

    spin_unlock(&enic->wq_lock[q_number]);

    return 0;
}

static void enic_log_q_error(struct enic *enic)
{
    unsigned int i;
    u32 error_status;

    for (i = 0; i < enic->wq_count; i++) {
        error_status = vnic_wq_error_status(&enic->wq[i]);
        if (error_status)
            netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
                i, error_status);
    }

    for (i = 0; i < enic->rq_count; i++) {
        error_status = vnic_rq_error_status(&enic->rq[i]);
        if (error_status)
            netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
                i, error_status);
    }
}

static void enic_msglvl_check(struct enic *enic)
{
    u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);

    if (msg_enable != enic->msg_enable) {
        netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
            enic->msg_enable, msg_enable);
        enic->msg_enable = msg_enable;
    }
}

static void enic_mtu_check(struct enic *enic)
{
    u32 mtu = vnic_dev_mtu(enic->vdev);
    struct net_device *netdev = enic->netdev;

    if (mtu && mtu != enic->port_mtu) {
        enic->port_mtu = mtu;
        if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
            mtu = max_t(int, ENIC_MIN_MTU,
                min_t(int, ENIC_MAX_MTU, mtu));
            if (mtu != netdev->mtu)
                schedule_work(&enic->change_mtu_work);
        } else {
            if (mtu < netdev->mtu)
                netdev_warn(netdev,
                    "interface MTU (%d) set higher "
                    "than switch port MTU (%d)\n",
                    netdev->mtu, mtu);
        }
    }
}

static void enic_link_check(struct enic *enic)
{
    int link_status = vnic_dev_link_status(enic->vdev);
    int carrier_ok = netif_carrier_ok(enic->netdev);

    if (link_status && !carrier_ok) {
        netdev_info(enic->netdev, "Link UP\n");
        netif_carrier_on(enic->netdev);
    } else if (!link_status && carrier_ok) {
        netdev_info(enic->netdev, "Link DOWN\n");
        netif_carrier_off(enic->netdev);
    }
}

static void enic_notify_check(struct enic *enic)
{
    enic_msglvl_check(enic);
    enic_mtu_check(enic);
    enic_link_check(enic);
}

#define ENIC_TEST_INTR(pba, i) (pba & (1 << i))

static irqreturn_t enic_isr_legacy(int irq, void *data)
{
    struct net_device *netdev = data;
    struct enic *enic = netdev_priv(netdev);
    unsigned int io_intr = enic_legacy_io_intr();
    unsigned int err_intr = enic_legacy_err_intr();
    unsigned int notify_intr = enic_legacy_notify_intr();
    u32 pba;

    vnic_intr_mask(&enic->intr[io_intr]);

    pba = vnic_intr_legacy_pba(enic->legacy_pba);
    if (!pba) {
        vnic_intr_unmask(&enic->intr[io_intr]);
        return IRQ_NONE;    /* not our interrupt */
    }

    if (ENIC_TEST_INTR(pba, notify_intr)) {
        vnic_intr_return_all_credits(&enic->intr[notify_intr]);
        enic_notify_check(enic);
    }

    if (ENIC_TEST_INTR(pba, err_intr)) {
        vnic_intr_return_all_credits(&enic->intr[err_intr]);
        enic_log_q_error(enic);
        /* schedule recovery from WQ/RQ error */
        schedule_work(&enic->reset);
        return IRQ_HANDLED;
    }

    if (ENIC_TEST_INTR(pba, io_intr)) {
        if (napi_schedule_prep(&enic->napi[0]))
            __napi_schedule(&enic->napi[0]);
    } else {
        vnic_intr_unmask(&enic->intr[io_intr]);
    }

    return IRQ_HANDLED;
}

static irqreturn_t enic_isr_msi(int irq, void *data)
{
    struct enic *enic = data;

    /* With MSI, there is no sharing of interrupts, so this is
     * our interrupt and there is no need to ack it.  The device
     * is not providing per-vector masking, so the OS will not
     * write to PCI config space to mask/unmask the interrupt.
     * We're using mask_on_assertion for MSI, so the device
     * automatically masks the interrupt when the interrupt is
     * generated.  Later, when exiting polling, the interrupt
     * will be unmasked (see enic_poll).
     *
     * Also, the device uses the same PCIe Traffic Class (TC)
     * for Memory Write data and MSI, so there are no ordering
     * issues; the MSI will always arrive at the Root Complex
     * _after_ corresponding Memory Writes (i.e. descriptor
     * writes).
     */

    napi_schedule(&enic->napi[0]);

    return IRQ_HANDLED;
}

static irqreturn_t enic_isr_msix_rq(int irq, void *data)
{
    struct napi_struct *napi = data;

    /* schedule NAPI polling for RQ cleanup */
    napi_schedule(napi);

    return IRQ_HANDLED;
}

static irqreturn_t enic_isr_msix_wq(int irq, void *data)
{
    struct enic *enic = data;
    unsigned int cq = enic_cq_wq(enic, 0);
    unsigned int intr = enic_msix_wq_intr(enic, 0);
    unsigned int wq_work_to_do = -1; /* no limit */
    unsigned int wq_work_done;

    wq_work_done = vnic_cq_service(&enic->cq[cq],
        wq_work_to_do, enic_wq_service, NULL);

    vnic_intr_return_credits(&enic->intr[intr],
        wq_work_done,
        1 /* unmask intr */,
        1 /* reset intr timer */);

    return IRQ_HANDLED;
}

static irqreturn_t enic_isr_msix_err(int irq, void *data)
{
    struct enic *enic = data;
    unsigned int intr = enic_msix_err_intr(enic);

    vnic_intr_return_all_credits(&enic->intr[intr]);

    enic_log_q_error(enic);

    /* schedule recovery from WQ/RQ error */
    schedule_work(&enic->reset);

    return IRQ_HANDLED;
}

static irqreturn_t enic_isr_msix_notify(int irq, void *data)
{
    struct enic *enic = data;
    unsigned int intr = enic_msix_notify_intr(enic);

    vnic_intr_return_all_credits(&enic->intr[intr]);
    enic_notify_check(enic);

    return IRQ_HANDLED;
}

static inline void enic_queue_wq_skb_cont(struct enic *enic,
    struct vnic_wq *wq, struct sk_buff *skb,
    unsigned int len_left, int loopback)
{
    const skb_frag_t *frag;

    /* Queue additional data fragments */
    for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
        len_left -= skb_frag_size(frag);
        enic_queue_wq_desc_cont(wq, skb,
            skb_frag_dma_map(&enic->pdev->dev,
                     frag, 0, skb_frag_size(frag),
                     DMA_TO_DEVICE),
            skb_frag_size(frag),
            (len_left == 0),    /* EOP? */
            loopback);
    }
}

static inline void enic_queue_wq_skb_vlan(struct enic *enic,
    struct vnic_wq *wq, struct sk_buff *skb,
    int vlan_tag_insert, unsigned int vlan_tag, int loopback)
{
    unsigned int head_len = skb_headlen(skb);
    unsigned int len_left = skb->len - head_len;
    int eop = (len_left == 0);

    /* Queue the main skb fragment. The fragments are no larger
     * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
     * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
     * per fragment is queued.
     */
    enic_queue_wq_desc(wq, skb,
        pci_map_single(enic->pdev, skb->data,
            head_len, PCI_DMA_TODEVICE),
        head_len,
        vlan_tag_insert, vlan_tag,
        eop, loopback);

    if (!eop)
        enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
}

static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
    struct vnic_wq *wq, struct sk_buff *skb,
    int vlan_tag_insert, unsigned int vlan_tag, int loopback)
{
    unsigned int head_len = skb_headlen(skb);
    unsigned int len_left = skb->len - head_len;
    unsigned int hdr_len = skb_checksum_start_offset(skb);
    unsigned int csum_offset = hdr_len + skb->csum_offset;
    int eop = (len_left == 0);

    /* Queue the main skb fragment. The fragments are no larger
     * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
     * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
     * per fragment is queued.
     */
    enic_queue_wq_desc_csum_l4(wq, skb,
        pci_map_single(enic->pdev, skb->data,
            head_len, PCI_DMA_TODEVICE),
        head_len,
        csum_offset,
        hdr_len,
        vlan_tag_insert, vlan_tag,
        eop, loopback);

    if (!eop)
        enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
}

static inline void enic_queue_wq_skb_tso(struct enic *enic,
    struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
    int vlan_tag_insert, unsigned int vlan_tag, int loopback)
{
    unsigned int frag_len_left = skb_headlen(skb);
    unsigned int len_left = skb->len - frag_len_left;
    unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
    int eop = (len_left == 0);
    unsigned int len;
    dma_addr_t dma_addr;
    unsigned int offset = 0;
    skb_frag_t *frag;

    /* Preload TCP csum field with IP pseudo hdr calculated
     * with IP length set to zero.  HW will later add in length
     * to each TCP segment resulting from the TSO.
     */

    if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
        ip_hdr(skb)->check = 0;
        tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
            ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
    } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
        tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
            &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
    }

    /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
     * for the main skb fragment
     */
    while (frag_len_left) {
        len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
        dma_addr = pci_map_single(enic->pdev, skb->data + offset,
                len, PCI_DMA_TODEVICE);
        enic_queue_wq_desc_tso(wq, skb,
            dma_addr,
            len,
            mss, hdr_len,
            vlan_tag_insert, vlan_tag,
            eop && (len == frag_len_left), loopback);
        frag_len_left -= len;
        offset += len;
    }

    if (eop)
        return;

    /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
     * for additional data fragments
     */
    for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
        len_left -= skb_frag_size(frag);
        frag_len_left = skb_frag_size(frag);
        offset = 0;

        while (frag_len_left) {
            len = min(frag_len_left,
                (unsigned int)WQ_ENET_MAX_DESC_LEN);
            dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
                            offset, len,
                            DMA_TO_DEVICE);
            enic_queue_wq_desc_cont(wq, skb,
                dma_addr,
                len,
                (len_left == 0) &&
                (len == frag_len_left),     /* EOP? */
                loopback);
            frag_len_left -= len;
            offset += len;
        }
    }
}

static inline void enic_queue_wq_skb(struct enic *enic,
    struct vnic_wq *wq, struct sk_buff *skb)
{
    unsigned int mss = skb_shinfo(skb)->gso_size;
    unsigned int vlan_tag = 0;
    int vlan_tag_insert = 0;
    int loopback = 0;

    if (vlan_tx_tag_present(skb)) {
        /* VLAN tag from trunking driver */
        vlan_tag_insert = 1;
        vlan_tag = vlan_tx_tag_get(skb);
    } else if (enic->loop_enable) {
        vlan_tag = enic->loop_tag;
        loopback = 1;
    }

    if (mss)
        enic_queue_wq_skb_tso(enic, wq, skb, mss,
            vlan_tag_insert, vlan_tag, loopback);
    else if (skb->ip_summed == CHECKSUM_PARTIAL)
        enic_queue_wq_skb_csum_l4(enic, wq, skb,
            vlan_tag_insert, vlan_tag, loopback);
    else
        enic_queue_wq_skb_vlan(enic, wq, skb,
            vlan_tag_insert, vlan_tag, loopback);
}

/* netif_tx_lock held, process context with BHs disabled, or BH */
static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
    struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    struct vnic_wq *wq = &enic->wq[0];
    unsigned long flags;

    if (skb->len <= 0) {
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
    }

    /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
     * which is very likely.  In the off chance it's going to take
     * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
     */

    if (skb_shinfo(skb)->gso_size == 0 &&
        skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
        skb_linearize(skb)) {
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
    }

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

    if (vnic_wq_desc_avail(wq) <
        skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
        netif_stop_queue(netdev);
        /* This is a hard error, log it */
        netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
        spin_unlock_irqrestore(&enic->wq_lock[0], flags);
        return NETDEV_TX_BUSY;
    }

    enic_queue_wq_skb(enic, wq, skb);

    if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
        netif_stop_queue(netdev);

    spin_unlock_irqrestore(&enic->wq_lock[0], flags);

    return NETDEV_TX_OK;
}

/* dev_base_lock rwlock held, nominally process context */
static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev,
                        struct rtnl_link_stats64 *net_stats)
{
    struct enic *enic = netdev_priv(netdev);
    struct vnic_stats *stats;

    enic_dev_stats_dump(enic, &stats);

    net_stats->tx_packets = stats->tx.tx_frames_ok;
    net_stats->tx_bytes = stats->tx.tx_bytes_ok;
    net_stats->tx_errors = stats->tx.tx_errors;
    net_stats->tx_dropped = stats->tx.tx_drops;

    net_stats->rx_packets = stats->rx.rx_frames_ok;
    net_stats->rx_bytes = stats->rx.rx_bytes_ok;
    net_stats->rx_errors = stats->rx.rx_errors;
    net_stats->multicast = stats->rx.rx_multicast_frames_ok;
    net_stats->rx_over_errors = enic->rq_truncated_pkts;
    net_stats->rx_crc_errors = enic->rq_bad_fcs;
    net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;

    return net_stats;
}

void enic_reset_addr_lists(struct enic *enic)
{
    enic->mc_count = 0;
    enic->uc_count = 0;
    enic->flags = 0;
}

static int enic_set_mac_addr(struct net_device *netdev, char *addr)
{
    struct enic *enic = netdev_priv(netdev);

    if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
        if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
            return -EADDRNOTAVAIL;
    } else {
        if (!is_valid_ether_addr(addr))
            return -EADDRNOTAVAIL;
    }

    memcpy(netdev->dev_addr, addr, netdev->addr_len);
    netdev->addr_assign_type &= ~NET_ADDR_RANDOM;

    return 0;
}

static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
{
    struct enic *enic = netdev_priv(netdev);
    struct sockaddr *saddr = p;
    char *addr = saddr->sa_data;
    int err;

    if (netif_running(enic->netdev)) {
        err = enic_dev_del_station_addr(enic);
        if (err)
            return err;
    }

    err = enic_set_mac_addr(netdev, addr);
    if (err)
        return err;

    if (netif_running(enic->netdev)) {
        err = enic_dev_add_station_addr(enic);
        if (err)
            return err;
    }

    return err;
}

static int enic_set_mac_address(struct net_device *netdev, void *p)
{
    struct sockaddr *saddr = p;
    char *addr = saddr->sa_data;
    struct enic *enic = netdev_priv(netdev);
    int err;

    err = enic_dev_del_station_addr(enic);
    if (err)
        return err;

    err = enic_set_mac_addr(netdev, addr);
    if (err)
        return err;

    return enic_dev_add_station_addr(enic);
}

static void enic_update_multicast_addr_list(struct enic *enic)
{
    struct net_device *netdev = enic->netdev;
    struct netdev_hw_addr *ha;
    unsigned int mc_count = netdev_mc_count(netdev);
    u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
    unsigned int i, j;

    if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS) {
        netdev_warn(netdev, "Registering only %d out of %d "
            "multicast addresses\n",
            ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
        mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
    }

    /* Is there an easier way?  Trying to minimize to
     * calls to add/del multicast addrs.  We keep the
     * addrs from the last call in enic->mc_addr and
     * look for changes to add/del.
     */

    i = 0;
    netdev_for_each_mc_addr(ha, netdev) {
        if (i == mc_count)
            break;
        memcpy(mc_addr[i++], ha->addr, ETH_ALEN);
    }

    for (i = 0; i < enic->mc_count; i++) {
        for (j = 0; j < mc_count; j++)
            if (ether_addr_equal(enic->mc_addr[i], mc_addr[j]))
                break;
        if (j == mc_count)
            enic_dev_del_addr(enic, enic->mc_addr[i]);
    }

    for (i = 0; i < mc_count; i++) {
        for (j = 0; j < enic->mc_count; j++)
            if (ether_addr_equal(mc_addr[i], enic->mc_addr[j]))
                break;
        if (j == enic->mc_count)
            enic_dev_add_addr(enic, mc_addr[i]);
    }

    /* Save the list to compare against next time
     */

    for (i = 0; i < mc_count; i++)
        memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);

    enic->mc_count = mc_count;
}

static void enic_update_unicast_addr_list(struct enic *enic)
{
    struct net_device *netdev = enic->netdev;
    struct netdev_hw_addr *ha;
    unsigned int uc_count = netdev_uc_count(netdev);
    u8 uc_addr[ENIC_UNICAST_PERFECT_FILTERS][ETH_ALEN];
    unsigned int i, j;

    if (uc_count > ENIC_UNICAST_PERFECT_FILTERS) {
        netdev_warn(netdev, "Registering only %d out of %d "
            "unicast addresses\n",
            ENIC_UNICAST_PERFECT_FILTERS, uc_count);
        uc_count = ENIC_UNICAST_PERFECT_FILTERS;
    }

    /* Is there an easier way?  Trying to minimize to
     * calls to add/del unicast addrs.  We keep the
     * addrs from the last call in enic->uc_addr and
     * look for changes to add/del.
     */

    i = 0;
    netdev_for_each_uc_addr(ha, netdev) {
        if (i == uc_count)
            break;
        memcpy(uc_addr[i++], ha->addr, ETH_ALEN);
    }

    for (i = 0; i < enic->uc_count; i++) {
        for (j = 0; j < uc_count; j++)
            if (ether_addr_equal(enic->uc_addr[i], uc_addr[j]))
                break;
        if (j == uc_count)
            enic_dev_del_addr(enic, enic->uc_addr[i]);
    }

    for (i = 0; i < uc_count; i++) {
        for (j = 0; j < enic->uc_count; j++)
            if (ether_addr_equal(uc_addr[i], enic->uc_addr[j]))
                break;
        if (j == enic->uc_count)
            enic_dev_add_addr(enic, uc_addr[i]);
    }

    /* Save the list to compare against next time
     */

    for (i = 0; i < uc_count; i++)
        memcpy(enic->uc_addr[i], uc_addr[i], ETH_ALEN);

    enic->uc_count = uc_count;
}

/* netif_tx_lock held, BHs disabled */
static void enic_set_rx_mode(struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    int directed = 1;
    int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
    int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
    int promisc = (netdev->flags & IFF_PROMISC) ||
        netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
    int allmulti = (netdev->flags & IFF_ALLMULTI) ||
        netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
    unsigned int flags = netdev->flags |
        (allmulti ? IFF_ALLMULTI : 0) |
        (promisc ? IFF_PROMISC : 0);

    if (enic->flags != flags) {
        enic->flags = flags;
        enic_dev_packet_filter(enic, directed,
            multicast, broadcast, promisc, allmulti);
    }

    if (!promisc) {
        enic_update_unicast_addr_list(enic);
        if (!allmulti)
            enic_update_multicast_addr_list(enic);
    }
}

/* netif_tx_lock held, BHs disabled */
static void enic_tx_timeout(struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    schedule_work(&enic->reset);
}

static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
{
    struct enic *enic = netdev_priv(netdev);
    struct enic_port_profile *pp;
    int err;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
        if (vf == PORT_SELF_VF) {
            memcpy(pp->vf_mac, mac, ETH_ALEN);
            return 0;
        } else {
            /*
             * For sriov vf's set the mac in hw
             */
            ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
                vnic_dev_set_mac_addr, mac);
            return enic_dev_status_to_errno(err);
        }
    } else
        return -EINVAL;
}

static int enic_set_vf_port(struct net_device *netdev, int vf,
    struct nlattr *port[])
{
    struct enic *enic = netdev_priv(netdev);
    struct enic_port_profile prev_pp;
    struct enic_port_profile *pp;
    int err = 0, restore_pp = 1;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    if (!port[IFLA_PORT_REQUEST])
        return -EOPNOTSUPP;

    memcpy(&prev_pp, pp, sizeof(*enic->pp));
    memset(pp, 0, sizeof(*enic->pp));

    pp->set |= ENIC_SET_REQUEST;
    pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);

    if (port[IFLA_PORT_PROFILE]) {
        pp->set |= ENIC_SET_NAME;
        memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
            PORT_PROFILE_MAX);
    }

    if (port[IFLA_PORT_INSTANCE_UUID]) {
        pp->set |= ENIC_SET_INSTANCE;
        memcpy(pp->instance_uuid,
            nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
    }

    if (port[IFLA_PORT_HOST_UUID]) {
        pp->set |= ENIC_SET_HOST;
        memcpy(pp->host_uuid,
            nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
    }

    if (vf == PORT_SELF_VF) {
        /* Special case handling: mac came from IFLA_VF_MAC */
        if (!is_zero_ether_addr(prev_pp.vf_mac))
            memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);

        if (is_zero_ether_addr(netdev->dev_addr))
            eth_hw_addr_random(netdev);
    } else {
        /* SR-IOV VF: get mac from adapter */
        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
            vnic_dev_get_mac_addr, pp->mac_addr);
        if (err) {
            netdev_err(netdev, "Error getting mac for vf %d\n", vf);
            memcpy(pp, &prev_pp, sizeof(*pp));
            return enic_dev_status_to_errno(err);
        }
    }

    err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
    if (err) {
        if (restore_pp) {
            /* Things are still the way they were: Implicit
             * DISASSOCIATE failed
             */
            memcpy(pp, &prev_pp, sizeof(*pp));
        } else {
            memset(pp, 0, sizeof(*pp));
            if (vf == PORT_SELF_VF)
                memset(netdev->dev_addr, 0, ETH_ALEN);
        }
    } else {
        /* Set flag to indicate that the port assoc/disassoc
         * request has been sent out to fw
         */
        pp->set |= ENIC_PORT_REQUEST_APPLIED;

        /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
        if (pp->request == PORT_REQUEST_DISASSOCIATE) {
            memset(pp->mac_addr, 0, ETH_ALEN);
            if (vf == PORT_SELF_VF)
                memset(netdev->dev_addr, 0, ETH_ALEN);
        }
    }

    if (vf == PORT_SELF_VF)
        memset(pp->vf_mac, 0, ETH_ALEN);

    return err;
}

static int enic_get_vf_port(struct net_device *netdev, int vf,
    struct sk_buff *skb)
{
    struct enic *enic = netdev_priv(netdev);
    u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
    struct enic_port_profile *pp;
    int err;

    ENIC_PP_BY_INDEX(enic, vf, pp, &err);
    if (err)
        return err;

    if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
        return -ENODATA;

    err = enic_process_get_pp_request(enic, vf, pp->request, &response);
    if (err)
        return err;

    if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
        nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
        ((pp->set & ENIC_SET_NAME) &&
         nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
        ((pp->set & ENIC_SET_INSTANCE) &&
         nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
             pp->instance_uuid)) ||
        ((pp->set & ENIC_SET_HOST) &&
         nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
        goto nla_put_failure;
    return 0;

nla_put_failure:
    return -EMSGSIZE;
}

static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
{
    struct enic *enic = vnic_dev_priv(rq->vdev);

    if (!buf->os_buf)
        return;

    pci_unmap_single(enic->pdev, buf->dma_addr,
        buf->len, PCI_DMA_FROMDEVICE);
    dev_kfree_skb_any(buf->os_buf);
}

static int enic_rq_alloc_buf(struct vnic_rq *rq)
{
    struct enic *enic = vnic_dev_priv(rq->vdev);
    struct net_device *netdev = enic->netdev;
    struct sk_buff *skb;
    unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
    unsigned int os_buf_index = 0;
    dma_addr_t dma_addr;

    skb = netdev_alloc_skb_ip_align(netdev, len);
    if (!skb)
        return -ENOMEM;

    dma_addr = pci_map_single(enic->pdev, skb->data,
        len, PCI_DMA_FROMDEVICE);

    enic_queue_rq_desc(rq, skb, os_buf_index,
        dma_addr, len);

    return 0;
}

static void enic_rq_indicate_buf(struct vnic_rq *rq,
    struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
    int skipped, void *opaque)
{
    struct enic *enic = vnic_dev_priv(rq->vdev);
    struct net_device *netdev = enic->netdev;
    struct sk_buff *skb;

    u8 type, color, eop, sop, ingress_port, vlan_stripped;
    u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
    u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
    u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
    u8 packet_error;
    u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
    u32 rss_hash;

    if (skipped)
        return;

    skb = buf->os_buf;
    prefetch(skb->data - NET_IP_ALIGN);
    pci_unmap_single(enic->pdev, buf->dma_addr,
        buf->len, PCI_DMA_FROMDEVICE);

    cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
        &type, &color, &q_number, &completed_index,
        &ingress_port, &fcoe, &eop, &sop, &rss_type,
        &csum_not_calc, &rss_hash, &bytes_written,
        &packet_error, &vlan_stripped, &vlan_tci, &checksum,
        &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
        &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
        &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
        &fcs_ok);

    if (packet_error) {

        if (!fcs_ok) {
            if (bytes_written > 0)
                enic->rq_bad_fcs++;
            else if (bytes_written == 0)
                enic->rq_truncated_pkts++;
        }

        dev_kfree_skb_any(skb);

        return;
    }

    if (eop && bytes_written > 0) {

        /* Good receive
         */

        skb_put(skb, bytes_written);
        skb->protocol = eth_type_trans(skb, netdev);

        if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc) {
            skb->csum = htons(checksum);
            skb->ip_summed = CHECKSUM_COMPLETE;
        }

        if (vlan_stripped)
            __vlan_hwaccel_put_tag(skb, vlan_tci);

        if (netdev->features & NETIF_F_GRO)
            napi_gro_receive(&enic->napi[q_number], skb);
        else
            netif_receive_skb(skb);
    } else {

        /* Buffer overflow
         */

        dev_kfree_skb_any(skb);
    }
}

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

    vnic_rq_service(&enic->rq[q_number], cq_desc,
        completed_index, VNIC_RQ_RETURN_DESC,
        enic_rq_indicate_buf, opaque);

    return 0;
}

static int enic_poll(struct napi_struct *napi, int budget)
{
    struct net_device *netdev = napi->dev;
    struct enic *enic = netdev_priv(netdev);
    unsigned int cq_rq = enic_cq_rq(enic, 0);
    unsigned int cq_wq = enic_cq_wq(enic, 0);
    unsigned int intr = enic_legacy_io_intr();
    unsigned int rq_work_to_do = budget;
    unsigned int wq_work_to_do = -1; /* no limit */
    unsigned int  work_done, rq_work_done, wq_work_done;
    int err;

    /* Service RQ (first) and WQ
     */

    rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
        rq_work_to_do, enic_rq_service, NULL);

    wq_work_done = vnic_cq_service(&enic->cq[cq_wq],
        wq_work_to_do, enic_wq_service, NULL);

    /* Accumulate intr event credits for this polling
     * cycle.  An intr event is the completion of a
     * a WQ or RQ packet.
     */

    work_done = rq_work_done + wq_work_done;

    if (work_done > 0)
        vnic_intr_return_credits(&enic->intr[intr],
            work_done,
            0 /* don't unmask intr */,
            0 /* don't reset intr timer */);

    err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);

    /* Buffer allocation failed. Stay in polling
     * mode so we can try to fill the ring again.
     */

    if (err)
        rq_work_done = rq_work_to_do;

    if (rq_work_done < rq_work_to_do) {

        /* Some work done, but not enough to stay in polling,
         * exit polling
         */

        napi_complete(napi);
        vnic_intr_unmask(&enic->intr[intr]);
    }

    return rq_work_done;
}

static int enic_poll_msix(struct napi_struct *napi, int budget)
{
    struct net_device *netdev = napi->dev;
    struct enic *enic = netdev_priv(netdev);
    unsigned int rq = (napi - &enic->napi[0]);
    unsigned int cq = enic_cq_rq(enic, rq);
    unsigned int intr = enic_msix_rq_intr(enic, rq);
    unsigned int work_to_do = budget;
    unsigned int work_done;
    int err;

    /* Service RQ
     */

    work_done = vnic_cq_service(&enic->cq[cq],
        work_to_do, enic_rq_service, NULL);

    /* Return intr event credits for this polling
     * cycle.  An intr event is the completion of a
     * RQ packet.
     */

    if (work_done > 0)
        vnic_intr_return_credits(&enic->intr[intr],
            work_done,
            0 /* don't unmask intr */,
            0 /* don't reset intr timer */);

    err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);

    /* Buffer allocation failed. Stay in polling mode
     * so we can try to fill the ring again.
     */

    if (err)
        work_done = work_to_do;

    if (work_done < work_to_do) {

        /* Some work done, but not enough to stay in polling,
         * exit polling
         */

        napi_complete(napi);
        vnic_intr_unmask(&enic->intr[intr]);
    }

    return work_done;
}

static void enic_notify_timer(unsigned long data)
{
    struct enic *enic = (struct enic *)data;

    enic_notify_check(enic);

    mod_timer(&enic->notify_timer,
        round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
}

static void enic_free_intr(struct enic *enic)
{
    struct net_device *netdev = enic->netdev;
    unsigned int i;

    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    case VNIC_DEV_INTR_MODE_INTX:
        free_irq(enic->pdev->irq, netdev);
        break;
    case VNIC_DEV_INTR_MODE_MSI:
        free_irq(enic->pdev->irq, enic);
        break;
    case VNIC_DEV_INTR_MODE_MSIX:
        for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
            if (enic->msix[i].requested)
                free_irq(enic->msix_entry[i].vector,
                    enic->msix[i].devid);
        break;
    default:
        break;
    }
}

static int enic_request_intr(struct enic *enic)
{
    struct net_device *netdev = enic->netdev;
    unsigned int i, intr;
    int err = 0;

    switch (vnic_dev_get_intr_mode(enic->vdev)) {

    case VNIC_DEV_INTR_MODE_INTX:

        err = request_irq(enic->pdev->irq, enic_isr_legacy,
            IRQF_SHARED, netdev->name, netdev);
        break;

    case VNIC_DEV_INTR_MODE_MSI:

        err = request_irq(enic->pdev->irq, enic_isr_msi,
            0, netdev->name, enic);
        break;

    case VNIC_DEV_INTR_MODE_MSIX:

        for (i = 0; i < enic->rq_count; i++) {
            intr = enic_msix_rq_intr(enic, i);
            sprintf(enic->msix[intr].devname,
                "%.11s-rx-%d", netdev->name, i);
            enic->msix[intr].isr = enic_isr_msix_rq;
            enic->msix[intr].devid = &enic->napi[i];
        }

        for (i = 0; i < enic->wq_count; i++) {
            intr = enic_msix_wq_intr(enic, i);
            sprintf(enic->msix[intr].devname,
                "%.11s-tx-%d", netdev->name, i);
            enic->msix[intr].isr = enic_isr_msix_wq;
            enic->msix[intr].devid = enic;
        }

        intr = enic_msix_err_intr(enic);
        sprintf(enic->msix[intr].devname,
            "%.11s-err", netdev->name);
        enic->msix[intr].isr = enic_isr_msix_err;
        enic->msix[intr].devid = enic;

        intr = enic_msix_notify_intr(enic);
        sprintf(enic->msix[intr].devname,
            "%.11s-notify", netdev->name);
        enic->msix[intr].isr = enic_isr_msix_notify;
        enic->msix[intr].devid = enic;

        for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
            enic->msix[i].requested = 0;

        for (i = 0; i < enic->intr_count; i++) {
            err = request_irq(enic->msix_entry[i].vector,
                enic->msix[i].isr, 0,
                enic->msix[i].devname,
                enic->msix[i].devid);
            if (err) {
                enic_free_intr(enic);
                break;
            }
            enic->msix[i].requested = 1;
        }

        break;

    default:
        break;
    }

    return err;
}

static void enic_synchronize_irqs(struct enic *enic)
{
    unsigned int i;

    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    case VNIC_DEV_INTR_MODE_INTX:
    case VNIC_DEV_INTR_MODE_MSI:
        synchronize_irq(enic->pdev->irq);
        break;
    case VNIC_DEV_INTR_MODE_MSIX:
        for (i = 0; i < enic->intr_count; i++)
            synchronize_irq(enic->msix_entry[i].vector);
        break;
    default:
        break;
    }
}

static int enic_dev_notify_set(struct enic *enic)
{
    int err;

    spin_lock(&enic->devcmd_lock);
    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    case VNIC_DEV_INTR_MODE_INTX:
        err = vnic_dev_notify_set(enic->vdev,
            enic_legacy_notify_intr());
        break;
    case VNIC_DEV_INTR_MODE_MSIX:
        err = vnic_dev_notify_set(enic->vdev,
            enic_msix_notify_intr(enic));
        break;
    default:
        err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
        break;
    }
    spin_unlock(&enic->devcmd_lock);

    return err;
}

static void enic_notify_timer_start(struct enic *enic)
{
    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    case VNIC_DEV_INTR_MODE_MSI:
        mod_timer(&enic->notify_timer, jiffies);
        break;
    default:
        /* Using intr for notification for INTx/MSI-X */
        break;
    }
}

/* rtnl lock is held, process context */
static int enic_open(struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    unsigned int i;
    int err;

    err = enic_request_intr(enic);
    if (err) {
        netdev_err(netdev, "Unable to request irq.\n");
        return err;
    }

    err = enic_dev_notify_set(enic);
    if (err) {
        netdev_err(netdev,
            "Failed to alloc notify buffer, aborting.\n");
        goto err_out_free_intr;
    }

    for (i = 0; i < enic->rq_count; i++) {
        vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
        /* Need at least one buffer on ring to get going */
        if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
            netdev_err(netdev, "Unable to alloc receive buffers\n");
            err = -ENOMEM;
            goto err_out_notify_unset;
        }
    }

    for (i = 0; i < enic->wq_count; i++)
        vnic_wq_enable(&enic->wq[i]);
    for (i = 0; i < enic->rq_count; i++)
        vnic_rq_enable(&enic->rq[i]);

    if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
        enic_dev_add_station_addr(enic);

    enic_set_rx_mode(netdev);

    netif_wake_queue(netdev);

    for (i = 0; i < enic->rq_count; i++)
        napi_enable(&enic->napi[i]);

    enic_dev_enable(enic);

    for (i = 0; i < enic->intr_count; i++)
        vnic_intr_unmask(&enic->intr[i]);

    enic_notify_timer_start(enic);

    return 0;

err_out_notify_unset:
    enic_dev_notify_unset(enic);
err_out_free_intr:
    enic_free_intr(enic);

    return err;
}

/* rtnl lock is held, process context */
static int enic_stop(struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    unsigned int i;
    int err;

    for (i = 0; i < enic->intr_count; i++) {
        vnic_intr_mask(&enic->intr[i]);
        (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
    }

    enic_synchronize_irqs(enic);

    del_timer_sync(&enic->notify_timer);

    enic_dev_disable(enic);

    for (i = 0; i < enic->rq_count; i++)
        napi_disable(&enic->napi[i]);

    netif_carrier_off(netdev);
    netif_tx_disable(netdev);

    if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
        enic_dev_del_station_addr(enic);

    for (i = 0; i < enic->wq_count; i++) {
        err = vnic_wq_disable(&enic->wq[i]);
        if (err)
            return err;
    }
    for (i = 0; i < enic->rq_count; i++) {
        err = vnic_rq_disable(&enic->rq[i]);
        if (err)
            return err;
    }

    enic_dev_notify_unset(enic);
    enic_free_intr(enic);

    for (i = 0; i < enic->wq_count; i++)
        vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
    for (i = 0; i < enic->rq_count; i++)
        vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
    for (i = 0; i < enic->cq_count; i++)
        vnic_cq_clean(&enic->cq[i]);
    for (i = 0; i < enic->intr_count; i++)
        vnic_intr_clean(&enic->intr[i]);

    return 0;
}

static int enic_change_mtu(struct net_device *netdev, int new_mtu)
{
    struct enic *enic = netdev_priv(netdev);
    int running = netif_running(netdev);

    if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
        return -EINVAL;

    if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
        return -EOPNOTSUPP;

    if (running)
        enic_stop(netdev);

    netdev->mtu = new_mtu;

    if (netdev->mtu > enic->port_mtu)
        netdev_warn(netdev,
            "interface MTU (%d) set higher than port MTU (%d)\n",
            netdev->mtu, enic->port_mtu);

    if (running)
        enic_open(netdev);

    return 0;
}

static void enic_change_mtu_work(struct work_struct *work)
{
    struct enic *enic = container_of(work, struct enic, change_mtu_work);
    struct net_device *netdev = enic->netdev;
    int new_mtu = vnic_dev_mtu(enic->vdev);
    int err;
    unsigned int i;

    new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));

    rtnl_lock();

    /* Stop RQ */
    del_timer_sync(&enic->notify_timer);

    for (i = 0; i < enic->rq_count; i++)
        napi_disable(&enic->napi[i]);

    vnic_intr_mask(&enic->intr[0]);
    enic_synchronize_irqs(enic);
    err = vnic_rq_disable(&enic->rq[0]);
    if (err) {
        netdev_err(netdev, "Unable to disable RQ.\n");
        return;
    }
    vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
    vnic_cq_clean(&enic->cq[0]);
    vnic_intr_clean(&enic->intr[0]);

    /* Fill RQ with new_mtu-sized buffers */
    netdev->mtu = new_mtu;
    vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
    /* Need at least one buffer on ring to get going */
    if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
        netdev_err(netdev, "Unable to alloc receive buffers.\n");
        return;
    }

    /* Start RQ */
    vnic_rq_enable(&enic->rq[0]);
    napi_enable(&enic->napi[0]);
    vnic_intr_unmask(&enic->intr[0]);
    enic_notify_timer_start(enic);

    rtnl_unlock();

    netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void enic_poll_controller(struct net_device *netdev)
{
    struct enic *enic = netdev_priv(netdev);
    struct vnic_dev *vdev = enic->vdev;
    unsigned int i, intr;

    switch (vnic_dev_get_intr_mode(vdev)) {
    case VNIC_DEV_INTR_MODE_MSIX:
        for (i = 0; i < enic->rq_count; i++) {
            intr = enic_msix_rq_intr(enic, i);
            enic_isr_msix_rq(enic->msix_entry[intr].vector,
                &enic->napi[i]);
        }

        for (i = 0; i < enic->wq_count; i++) {
            intr = enic_msix_wq_intr(enic, i);
            enic_isr_msix_wq(enic->msix_entry[intr].vector, enic);
        }

        break;
    case VNIC_DEV_INTR_MODE_MSI:
        enic_isr_msi(enic->pdev->irq, enic);
        break;
    case VNIC_DEV_INTR_MODE_INTX:
        enic_isr_legacy(enic->pdev->irq, netdev);
        break;
    default:
        break;
    }
}
#endif

static int enic_dev_wait(struct vnic_dev *vdev,
    int (*start)(struct vnic_dev *, int),
    int (*finished)(struct vnic_dev *, int *),
    int arg)
{
    unsigned long time;
    int done;
    int err;

    BUG_ON(in_interrupt());

    err = start(vdev, arg);
    if (err)
        return err;

    /* Wait for func to complete...2 seconds max
     */

    time = jiffies + (HZ * 2);
    do {

        err = finished(vdev, &done);
        if (err)
            return err;

        if (done)
            return 0;

        schedule_timeout_uninterruptible(HZ / 10);

    } while (time_after(time, jiffies));

    return -ETIMEDOUT;
}

static int enic_dev_open(struct enic *enic)
{
    int err;

    err = enic_dev_wait(enic->vdev, vnic_dev_open,
        vnic_dev_open_done, 0);
    if (err)
        dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
            err);

    return err;
}

static int enic_dev_hang_reset(struct enic *enic)
{
    int err;

    err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
        vnic_dev_hang_reset_done, 0);
    if (err)
        netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
            err);

    return err;
}

static int enic_set_rsskey(struct enic *enic)
{
    dma_addr_t rss_key_buf_pa;
    union vnic_rss_key *rss_key_buf_va = NULL;
    union vnic_rss_key rss_key = {
        .key[0].b = {85, 67, 83, 97, 119, 101, 115, 111, 109, 101},
        .key[1].b = {80, 65, 76, 79, 117, 110, 105, 113, 117, 101},
        .key[2].b = {76, 73, 78, 85, 88, 114, 111, 99, 107, 115},
        .key[3].b = {69, 78, 73, 67, 105, 115, 99, 111, 111, 108},
    };
    int err;

    rss_key_buf_va = pci_alloc_consistent(enic->pdev,
        sizeof(union vnic_rss_key), &rss_key_buf_pa);
    if (!rss_key_buf_va)
        return -ENOMEM;

    memcpy(rss_key_buf_va, &rss_key, sizeof(union vnic_rss_key));

    spin_lock(&enic->devcmd_lock);
    err = enic_set_rss_key(enic,
        rss_key_buf_pa,
        sizeof(union vnic_rss_key));
    spin_unlock(&enic->devcmd_lock);

    pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
        rss_key_buf_va, rss_key_buf_pa);

    return err;
}

static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
{
    dma_addr_t rss_cpu_buf_pa;
    union vnic_rss_cpu *rss_cpu_buf_va = NULL;
    unsigned int i;
    int err;

    rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
        sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
    if (!rss_cpu_buf_va)
        return -ENOMEM;

    for (i = 0; i < (1 << rss_hash_bits); i++)
        (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;

    spin_lock(&enic->devcmd_lock);
    err = enic_set_rss_cpu(enic,
        rss_cpu_buf_pa,
        sizeof(union vnic_rss_cpu));
    spin_unlock(&enic->devcmd_lock);

    pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
        rss_cpu_buf_va, rss_cpu_buf_pa);

    return err;
}

static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
    u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
{
    const u8 tso_ipid_split_en = 0;
    const u8 ig_vlan_strip_en = 1;
    int err;

    /* Enable VLAN tag stripping.
    */

    spin_lock(&enic->devcmd_lock);
    err = enic_set_nic_cfg(enic,
        rss_default_cpu, rss_hash_type,
        rss_hash_bits, rss_base_cpu,
        rss_enable, tso_ipid_split_en,
        ig_vlan_strip_en);
    spin_unlock(&enic->devcmd_lock);

    return err;
}

static int enic_set_rss_nic_cfg(struct enic *enic)
{
    struct device *dev = enic_get_dev(enic);
    const u8 rss_default_cpu = 0;
    const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
        NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
        NIC_CFG_RSS_HASH_TYPE_IPV6 |
        NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
    const u8 rss_hash_bits = 7;
    const u8 rss_base_cpu = 0;
    u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);

    if (rss_enable) {
        if (!enic_set_rsskey(enic)) {
            if (enic_set_rsscpu(enic, rss_hash_bits)) {
                rss_enable = 0;
                dev_warn(dev, "RSS disabled, "
                    "Failed to set RSS cpu indirection table.");
            }
        } else {
            rss_enable = 0;
            dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
        }
    }

    return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
        rss_hash_bits, rss_base_cpu, rss_enable);
}

static void enic_reset(struct work_struct *work)
{
    struct enic *enic = container_of(work, struct enic, reset);

    if (!netif_running(enic->netdev))
        return;

    rtnl_lock();

    enic_dev_hang_notify(enic);
    enic_stop(enic->netdev);
    enic_dev_hang_reset(enic);
    enic_reset_addr_lists(enic);
    enic_init_vnic_resources(enic);
    enic_set_rss_nic_cfg(enic);
    enic_dev_set_ig_vlan_rewrite_mode(enic);
    enic_open(enic->netdev);

    rtnl_unlock();
}

static int enic_set_intr_mode(struct enic *enic)
{
    unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
    unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
    unsigned int i;

    /* Set interrupt mode (INTx, MSI, MSI-X) depending
     * on system capabilities.
     *
     * Try MSI-X first
     *
     * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
     * (the second to last INTR is used for WQ/RQ errors)
     * (the last INTR is used for notifications)
     */

    BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
    for (i = 0; i < n + m + 2; i++)
        enic->msix_entry[i].entry = i;

    /* Use multiple RQs if RSS is enabled
     */

    if (ENIC_SETTING(enic, RSS) &&
        enic->config.intr_mode < 1 &&
        enic->rq_count >= n &&
        enic->wq_count >= m &&
        enic->cq_count >= n + m &&
        enic->intr_count >= n + m + 2) {

        if (!pci_enable_msix(enic->pdev, enic->msix_entry, n + m + 2)) {

            enic->rq_count = n;
            enic->wq_count = m;
            enic->cq_count = n + m;
            enic->intr_count = n + m + 2;

            vnic_dev_set_intr_mode(enic->vdev,
                VNIC_DEV_INTR_MODE_MSIX);

            return 0;
        }
    }

    if (enic->config.intr_mode < 1 &&
        enic->rq_count >= 1 &&
        enic->wq_count >= m &&
        enic->cq_count >= 1 + m &&
        enic->intr_count >= 1 + m + 2) {
        if (!pci_enable_msix(enic->pdev, enic->msix_entry, 1 + m + 2)) {

            enic->rq_count = 1;
            enic->wq_count = m;
            enic->cq_count = 1 + m;
            enic->intr_count = 1 + m + 2;

            vnic_dev_set_intr_mode(enic->vdev,
                VNIC_DEV_INTR_MODE_MSIX);

            return 0;
        }
    }

    /* Next try MSI
     *
     * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
     */

    if (enic->config.intr_mode < 2 &&
        enic->rq_count >= 1 &&
        enic->wq_count >= 1 &&
        enic->cq_count >= 2 &&
        enic->intr_count >= 1 &&
        !pci_enable_msi(enic->pdev)) {

        enic->rq_count = 1;
        enic->wq_count = 1;
        enic->cq_count = 2;
        enic->intr_count = 1;

        vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);

        return 0;
    }

    /* Next try INTx
     *
     * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
     * (the first INTR is used for WQ/RQ)
     * (the second INTR is used for WQ/RQ errors)
     * (the last INTR is used for notifications)
     */

    if (enic->config.intr_mode < 3 &&
        enic->rq_count >= 1 &&
        enic->wq_count >= 1 &&
        enic->cq_count >= 2 &&
        enic->intr_count >= 3) {

        enic->rq_count = 1;
        enic->wq_count = 1;
        enic->cq_count = 2;
        enic->intr_count = 3;

        vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);

        return 0;
    }

    vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);

    return -EINVAL;
}

static void enic_clear_intr_mode(struct enic *enic)
{
    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    case VNIC_DEV_INTR_MODE_MSIX:
        pci_disable_msix(enic->pdev);
        break;
    case VNIC_DEV_INTR_MODE_MSI:
        pci_disable_msi(enic->pdev);
        break;
    default:
        break;
    }

    vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
}

static const struct net_device_ops enic_netdev_dynamic_ops = {
    .ndo_open       = enic_open,
    .ndo_stop       = enic_stop,
    .ndo_start_xmit     = enic_hard_start_xmit,
    .ndo_get_stats64    = enic_get_stats,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_rx_mode    = enic_set_rx_mode,
    .ndo_set_mac_address    = enic_set_mac_address_dynamic,
    .ndo_change_mtu     = enic_change_mtu,
    .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
    .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
    .ndo_tx_timeout     = enic_tx_timeout,
    .ndo_set_vf_port    = enic_set_vf_port,
    .ndo_get_vf_port    = enic_get_vf_port,
    .ndo_set_vf_mac     = enic_set_vf_mac,
#ifdef CONFIG_NET_POLL_CONTROLLER
    .ndo_poll_controller    = enic_poll_controller,
#endif
};

static const struct net_device_ops enic_netdev_ops = {
    .ndo_open       = enic_open,
    .ndo_stop       = enic_stop,
    .ndo_start_xmit     = enic_hard_start_xmit,
    .ndo_get_stats64    = enic_get_stats,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_mac_address    = enic_set_mac_address,
    .ndo_set_rx_mode    = enic_set_rx_mode,
    .ndo_change_mtu     = enic_change_mtu,
    .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
    .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
    .ndo_tx_timeout     = enic_tx_timeout,
    .ndo_set_vf_port    = enic_set_vf_port,
    .ndo_get_vf_port    = enic_get_vf_port,
    .ndo_set_vf_mac     = enic_set_vf_mac,
#ifdef CONFIG_NET_POLL_CONTROLLER
    .ndo_poll_controller    = enic_poll_controller,
#endif
};

static void enic_dev_deinit(struct enic *enic)
{
    unsigned int i;

    for (i = 0; i < enic->rq_count; i++)
        netif_napi_del(&enic->napi[i]);

    enic_free_vnic_resources(enic);
    enic_clear_intr_mode(enic);
}

static int enic_dev_init(struct enic *enic)
{
    struct device *dev = enic_get_dev(enic);
    struct net_device *netdev = enic->netdev;
    unsigned int i;
    int err;

    /* Get interrupt coalesce timer info */
    err = enic_dev_intr_coal_timer_info(enic);
    if (err) {
        dev_warn(dev, "Using default conversion factor for "
            "interrupt coalesce timer\n");
        vnic_dev_intr_coal_timer_info_default(enic->vdev);
    }

    /* Get vNIC configuration
     */

    err = enic_get_vnic_config(enic);
    if (err) {
        dev_err(dev, "Get vNIC configuration failed, aborting\n");
        return err;
    }

    /* Get available resource counts
     */

    enic_get_res_counts(enic);

    /* Set interrupt mode based on resource counts and system
     * capabilities
     */

    err = enic_set_intr_mode(enic);
    if (err) {
        dev_err(dev, "Failed to set intr mode based on resource "
            "counts and system capabilities, aborting\n");
        return err;
    }

    /* Allocate and configure vNIC resources
     */

    err = enic_alloc_vnic_resources(enic);
    if (err) {
        dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
        goto err_out_free_vnic_resources;
    }

    enic_init_vnic_resources(enic);

    err = enic_set_rss_nic_cfg(enic);
    if (err) {
        dev_err(dev, "Failed to config nic, aborting\n");
        goto err_out_free_vnic_resources;
    }

    switch (vnic_dev_get_intr_mode(enic->vdev)) {
    default:
        netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
        break;
    case VNIC_DEV_INTR_MODE_MSIX:
        for (i = 0; i < enic->rq_count; i++)
            netif_napi_add(netdev, &enic->napi[i],
                enic_poll_msix, 64);
        break;
    }

    return 0;

err_out_free_vnic_resources:
    enic_clear_intr_mode(enic);
    enic_free_vnic_resources(enic);

    return err;
}

static void enic_iounmap(struct enic *enic)
{
    unsigned int i;

    for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
        if (enic->bar[i].vaddr)
            iounmap(enic->bar[i].vaddr);
}

static int __devinit enic_probe(struct pci_dev *pdev,
    const struct pci_device_id *ent)
{
    struct device *dev = &pdev->dev;
    struct net_device *netdev;
    struct enic *enic;
    int using_dac = 0;
    unsigned int i;
    int err;
#ifdef CONFIG_PCI_IOV
    int pos = 0;
#endif
    int num_pps = 1;

    /* Allocate net device structure and initialize.  Private
     * instance data is initialized to zero.
     */

    netdev = alloc_etherdev(sizeof(struct enic));
    if (!netdev)
        return -ENOMEM;

    pci_set_drvdata(pdev, netdev);

    SET_NETDEV_DEV(netdev, &pdev->dev);

    enic = netdev_priv(netdev);
    enic->netdev = netdev;
    enic->pdev = pdev;

    /* Setup PCI resources
     */

    err = pci_enable_device_mem(pdev);
    if (err) {
        dev_err(dev, "Cannot enable PCI device, aborting\n");
        goto err_out_free_netdev;
    }

    err = pci_request_regions(pdev, DRV_NAME);
    if (err) {
        dev_err(dev, "Cannot request PCI regions, aborting\n");
        goto err_out_disable_device;
    }

    pci_set_master(pdev);

    /* Query PCI controller on system for DMA addressing
     * limitation for the device.  Try 40-bit first, and
     * fail to 32-bit.
     */

    err = pci_set_dma_mask(pdev, DMA_BIT_MASK(40));
    if (err) {
        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
        if (err) {
            dev_err(dev, "No usable DMA configuration, aborting\n");
            goto err_out_release_regions;
        }
        err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
        if (err) {
            dev_err(dev, "Unable to obtain %u-bit DMA "
                "for consistent allocations, aborting\n", 32);
            goto err_out_release_regions;
        }
    } else {
        err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(40));
        if (err) {
            dev_err(dev, "Unable to obtain %u-bit DMA "
                "for consistent allocations, aborting\n", 40);
            goto err_out_release_regions;
        }
        using_dac = 1;
    }

    /* Map vNIC resources from BAR0-5
     */

    for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
        if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
            continue;
        enic->bar[i].len = pci_resource_len(pdev, i);
        enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
        if (!enic->bar[i].vaddr) {
            dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
            err = -ENODEV;
            goto err_out_iounmap;
        }
        enic->bar[i].bus_addr = pci_resource_start(pdev, i);
    }

    /* Register vNIC device
     */

    enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
        ARRAY_SIZE(enic->bar));
    if (!enic->vdev) {
        dev_err(dev, "vNIC registration failed, aborting\n");
        err = -ENODEV;
        goto err_out_iounmap;
    }

#ifdef CONFIG_PCI_IOV
    /* Get number of subvnics */
    pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
    if (pos) {
        pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
            &enic->num_vfs);
        if (enic->num_vfs) {
            err = pci_enable_sriov(pdev, enic->num_vfs);
            if (err) {
                dev_err(dev, "SRIOV enable failed, aborting."
                    " pci_enable_sriov() returned %d\n",
                    err);
                goto err_out_vnic_unregister;
            }
            enic->priv_flags |= ENIC_SRIOV_ENABLED;
            num_pps = enic->num_vfs;
        }
    }
#endif

    /* Allocate structure for port profiles */
    enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
    if (!enic->pp) {
        err = -ENOMEM;
        goto err_out_disable_sriov_pp;
    }

    /* Issue device open to get device in known state
     */

    err = enic_dev_open(enic);
    if (err) {
        dev_err(dev, "vNIC dev open failed, aborting\n");
        goto err_out_disable_sriov;
    }

    /* Setup devcmd lock
     */

    spin_lock_init(&enic->devcmd_lock);

    /*
     * Set ingress vlan rewrite mode before vnic initialization
     */

    err = enic_dev_set_ig_vlan_rewrite_mode(enic);
    if (err) {
        dev_err(dev,
            "Failed to set ingress vlan rewrite mode, aborting.\n");
        goto err_out_dev_close;
    }

    /* Issue device init to initialize the vnic-to-switch link.
     * We'll start with carrier off and wait for link UP
     * notification later to turn on carrier.  We don't need
     * to wait here for the vnic-to-switch link initialization
     * to complete; link UP notification is the indication that
     * the process is complete.
     */

    netif_carrier_off(netdev);

    /* Do not call dev_init for a dynamic vnic.
     * For a dynamic vnic, init_prov_info will be
     * called later by an upper layer.
     */

    if (!enic_is_dynamic(enic)) {
        err = vnic_dev_init(enic->vdev, 0);
        if (err) {
            dev_err(dev, "vNIC dev init failed, aborting\n");
            goto err_out_dev_close;
        }
    }

    err = enic_dev_init(enic);
    if (err) {
        dev_err(dev, "Device initialization failed, aborting\n");
        goto err_out_dev_close;
    }

    /* Setup notification timer, HW reset task, and wq locks
     */

    init_timer(&enic->notify_timer);
    enic->notify_timer.function = enic_notify_timer;
    enic->notify_timer.data = (unsigned long)enic;

    INIT_WORK(&enic->reset, enic_reset);
    INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);

    for (i = 0; i < enic->wq_count; i++)
        spin_lock_init(&enic->wq_lock[i]);

    /* Register net device
     */

    enic->port_mtu = enic->config.mtu;
    (void)enic_change_mtu(netdev, enic->port_mtu);

    err = enic_set_mac_addr(netdev, enic->mac_addr);
    if (err) {
        dev_err(dev, "Invalid MAC address, aborting\n");
        goto err_out_dev_deinit;
    }

    enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
    enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;

    if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
        netdev->netdev_ops = &enic_netdev_dynamic_ops;
    else
        netdev->netdev_ops = &enic_netdev_ops;

    netdev->watchdog_timeo = 2 * HZ;
    netdev->ethtool_ops = &enic_ethtool_ops;

    netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
    if (ENIC_SETTING(enic, LOOP)) {
        netdev->features &= ~NETIF_F_HW_VLAN_TX;
        enic->loop_enable = 1;
        enic->loop_tag = enic->config.loop_tag;
        dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
    }
    if (ENIC_SETTING(enic, TXCSUM))
        netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
    if (ENIC_SETTING(enic, TSO))
        netdev->hw_features |= NETIF_F_TSO |
            NETIF_F_TSO6 | NETIF_F_TSO_ECN;
    if (ENIC_SETTING(enic, RXCSUM))
        netdev->hw_features |= NETIF_F_RXCSUM;

    netdev->features |= netdev->hw_features;

    if (using_dac)
        netdev->features |= NETIF_F_HIGHDMA;

    netdev->priv_flags |= IFF_UNICAST_FLT;

    err = register_netdev(netdev);
    if (err) {
        dev_err(dev, "Cannot register net device, aborting\n");
        goto err_out_dev_deinit;
    }

    return 0;

err_out_dev_deinit:
    enic_dev_deinit(enic);
err_out_dev_close:
    vnic_dev_close(enic->vdev);
err_out_disable_sriov:
    kfree(enic->pp);
err_out_disable_sriov_pp:
#ifdef CONFIG_PCI_IOV
    if (enic_sriov_enabled(enic)) {
        pci_disable_sriov(pdev);
        enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
    }
err_out_vnic_unregister:
#endif
    vnic_dev_unregister(enic->vdev);
err_out_iounmap:
    enic_iounmap(enic);
err_out_release_regions:
    pci_release_regions(pdev);
err_out_disable_device:
    pci_disable_device(pdev);
err_out_free_netdev:
    pci_set_drvdata(pdev, NULL);
    free_netdev(netdev);

    return err;
}

static void __devexit enic_remove(struct pci_dev *pdev)
{
    struct net_device *netdev = pci_get_drvdata(pdev);

    if (netdev) {
        struct enic *enic = netdev_priv(netdev);

        cancel_work_sync(&enic->reset);
        cancel_work_sync(&enic->change_mtu_work);
        unregister_netdev(netdev);
        enic_dev_deinit(enic);
        vnic_dev_close(enic->vdev);
#ifdef CONFIG_PCI_IOV
        if (enic_sriov_enabled(enic)) {
            pci_disable_sriov(pdev);
            enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
        }
#endif
        kfree(enic->pp);
        vnic_dev_unregister(enic->vdev);
        enic_iounmap(enic);
        pci_release_regions(pdev);
        pci_disable_device(pdev);
        pci_set_drvdata(pdev, NULL);
        free_netdev(netdev);
    }
}

static struct pci_driver enic_driver = {
    .name = DRV_NAME,
    .id_table = enic_id_table,
    .probe = enic_probe,
    .remove = __devexit_p(enic_remove),
};

static int __init enic_init_module(void)
{
    pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);

    return pci_register_driver(&enic_driver);
}

static void __exit enic_cleanup_module(void)
{
    pci_unregister_driver(&enic_driver);
}

module_init(enic_init_module);
module_exit(enic_cleanup_module);