/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2008-2017 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 */

#include "opt_rss.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/endian.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/smp.h>
#include <vm/vm.h>
#include <vm/pmap.h>

#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_media.h>
#include <net/if_vlan_var.h>
#include <net/iflib.h>
#ifdef RSS
#include <net/rss_config.h>
#endif

#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>

#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#include "ifdi_if.h"
#include "enic.h"

#include "opt_inet.h"
#include "opt_inet6.h"

static SYSCTL_NODE(_hw, OID_AUTO, enic, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "ENIC");

static const pci_vendor_info_t enic_vendor_info_array[] =
{
        PVID(CISCO_VENDOR_ID, PCI_DEVICE_ID_CISCO_VIC_ENET,
             DRV_DESCRIPTION),
                PVID(CISCO_VENDOR_ID, PCI_DEVICE_ID_CISCO_VIC_ENET_VF,
                     DRV_DESCRIPTION " VF"),
        /* required last entry */

                PVID_END
};

static void *enic_register(device_t);
static int enic_attach_pre(if_ctx_t);
static int enic_msix_intr_assign(if_ctx_t, int);

static int enic_attach_post(if_ctx_t);
static int enic_detach(if_ctx_t);

static int enic_tx_queues_alloc(if_ctx_t, caddr_t *, uint64_t *, int, int);
static int enic_rx_queues_alloc(if_ctx_t, caddr_t *, uint64_t *, int, int);
static void enic_queues_free(if_ctx_t);
static int enic_rxq_intr(void *);
static int enic_event_intr(void *);
static int enic_err_intr(void *);
static void enic_stop(if_ctx_t);
static void enic_init(if_ctx_t);
static void enic_multi_set(if_ctx_t);
static int enic_mtu_set(if_ctx_t, uint32_t);
static void enic_media_status(if_ctx_t, struct ifmediareq *);
static int enic_media_change(if_ctx_t);
static int enic_promisc_set(if_ctx_t, int);
static uint64_t enic_get_counter(if_ctx_t, ift_counter);
static void enic_update_admin_status(if_ctx_t);
static void enic_txq_timer(if_ctx_t, uint16_t);
static int enic_link_is_up(struct enic_softc *);
static void enic_link_status(struct enic_softc *);
static void enic_set_lladdr(struct enic_softc *);
static void enic_setup_txq_sysctl(struct vnic_wq *, int, struct sysctl_ctx_list *,
    struct sysctl_oid_list *);
static void enic_setup_rxq_sysctl(struct vnic_rq *, int,  struct sysctl_ctx_list *,
    struct sysctl_oid_list *);
static void enic_setup_sysctl(struct enic_softc *);
static int enic_tx_queue_intr_enable(if_ctx_t, uint16_t);
static int enic_rx_queue_intr_enable(if_ctx_t, uint16_t);
static void enic_enable_intr(struct enic_softc *, int);
static void enic_disable_intr(struct enic_softc *, int);
static void enic_intr_enable_all(if_ctx_t);
static void enic_intr_disable_all(if_ctx_t);
static int enic_dev_open(struct enic *);
static int enic_dev_init(struct enic *);
static void *enic_alloc_consistent(void *, size_t, bus_addr_t *,
    struct iflib_dma_info *, u8 *);
static void enic_free_consistent(void *, size_t, void *, bus_addr_t,
    struct iflib_dma_info *);
static int enic_pci_mapping(struct enic_softc *);
static void enic_pci_mapping_free(struct enic_softc *);
static int enic_dev_wait(struct vnic_dev *, int (*) (struct vnic_dev *, int),
    int (*) (struct vnic_dev *, int *), int arg);
static int enic_map_bar(struct enic_softc *, struct enic_bar_info *, int, bool);
static void enic_update_packet_filter(struct enic *enic);
static bool enic_if_needs_restart(if_ctx_t, enum iflib_restart_event);

typedef enum {
        ENIC_BARRIER_RD,
        ENIC_BARRIER_WR,
        ENIC_BARRIER_RDWR,
} enic_barrier_t;

static device_method_t enic_methods[] = {
        /* Device interface */
        DEVMETHOD(device_register, enic_register),
        DEVMETHOD(device_probe, iflib_device_probe),
        DEVMETHOD(device_attach, iflib_device_attach),
        DEVMETHOD(device_detach, iflib_device_detach),
        DEVMETHOD(device_shutdown, iflib_device_shutdown),
        DEVMETHOD(device_suspend, iflib_device_suspend),
        DEVMETHOD(device_resume, iflib_device_resume),
        DEVMETHOD_END
};

static driver_t enic_driver = {
        "enic", enic_methods, sizeof(struct enic_softc)
};

DRIVER_MODULE(enic, pci, enic_driver, 0, 0);
IFLIB_PNP_INFO(pci, enic, enic_vendor_info_array);
MODULE_VERSION(enic, 2);

MODULE_DEPEND(enic, pci, 1, 1, 1);
MODULE_DEPEND(enic, ether, 1, 1, 1);
MODULE_DEPEND(enic, iflib, 1, 1, 1);

static device_method_t enic_iflib_methods[] = {
        DEVMETHOD(ifdi_tx_queues_alloc, enic_tx_queues_alloc),
        DEVMETHOD(ifdi_rx_queues_alloc, enic_rx_queues_alloc),
        DEVMETHOD(ifdi_queues_free, enic_queues_free),

        DEVMETHOD(ifdi_attach_pre, enic_attach_pre),
        DEVMETHOD(ifdi_attach_post, enic_attach_post),
        DEVMETHOD(ifdi_detach, enic_detach),

        DEVMETHOD(ifdi_init, enic_init),
        DEVMETHOD(ifdi_stop, enic_stop),
        DEVMETHOD(ifdi_multi_set, enic_multi_set),
        DEVMETHOD(ifdi_mtu_set, enic_mtu_set),
        DEVMETHOD(ifdi_media_status, enic_media_status),
        DEVMETHOD(ifdi_media_change, enic_media_change),
        DEVMETHOD(ifdi_promisc_set, enic_promisc_set),
        DEVMETHOD(ifdi_get_counter, enic_get_counter),
        DEVMETHOD(ifdi_update_admin_status, enic_update_admin_status),
        DEVMETHOD(ifdi_timer, enic_txq_timer),

        DEVMETHOD(ifdi_tx_queue_intr_enable, enic_tx_queue_intr_enable),
        DEVMETHOD(ifdi_rx_queue_intr_enable, enic_rx_queue_intr_enable),
        DEVMETHOD(ifdi_intr_enable, enic_intr_enable_all),
        DEVMETHOD(ifdi_intr_disable, enic_intr_disable_all),
        DEVMETHOD(ifdi_msix_intr_assign, enic_msix_intr_assign),

        DEVMETHOD(ifdi_needs_restart, enic_if_needs_restart),

        DEVMETHOD_END
};

static driver_t enic_iflib_driver = {
        "enic", enic_iflib_methods, sizeof(struct enic_softc)
};

extern struct if_txrx enic_txrx;

static struct if_shared_ctx enic_sctx_init = {
        .isc_magic = IFLIB_MAGIC,
        .isc_q_align = 512,

        .isc_tx_maxsize = ENIC_TX_MAX_PKT_SIZE,
        .isc_tx_maxsegsize = PAGE_SIZE,

        /*
         * These values are used to configure the busdma tag used for receive
         * descriptors.  Each receive descriptor only points to one buffer.
         */
        .isc_rx_maxsize = ENIC_DEFAULT_RX_MAX_PKT_SIZE, /* One buf per
                                                         * descriptor */
        .isc_rx_nsegments = 1,  /* One mapping per descriptor */
        .isc_rx_maxsegsize = ENIC_DEFAULT_RX_MAX_PKT_SIZE,
        .isc_admin_intrcnt = 2,
        .isc_vendor_info = enic_vendor_info_array,
        .isc_driver_version = "1",
        .isc_driver = &enic_iflib_driver,
        .isc_flags = IFLIB_HAS_RXCQ | IFLIB_HAS_TXCQ | IFLIB_SKIP_MSIX,

        /*
         * Number of receive queues per receive queue set, with associated
         * descriptor settings for each.
         */

        .isc_nrxqs = 2,
        .isc_nfl = 1,           /* one free list for each receive command
                                 * queue */
        .isc_nrxd_min = {16, 16},
        .isc_nrxd_max = {2048, 2048},
        .isc_nrxd_default = {64, 64},

        /*
         * Number of transmit queues per transmit queue set, with associated
         * descriptor settings for each.
         */
        .isc_ntxqs = 2,
        .isc_ntxd_min = {16, 16},
        .isc_ntxd_max = {2048, 2048},
        .isc_ntxd_default = {64, 64},
};

static void *
enic_register(device_t dev)
{
        return (&enic_sctx_init);
}

static int
enic_allocate_msix(struct enic_softc *softc) {
        if_ctx_t ctx;
        if_softc_ctx_t scctx;
        if_shared_ctx_t sctx;
        device_t dev;
        cpuset_t cpus;
        int queues, vectors, requested;
        int err = 0;

        dev = softc->dev;
        ctx = softc->ctx;
        scctx = softc->scctx;
        sctx = iflib_get_sctx(ctx);

        if (bus_get_cpus(dev, INTR_CPUS, sizeof(cpus), &cpus) != 0) {
                device_printf(dev, "Unable to fetch CPU list\n");
                CPU_COPY(&all_cpus, &cpus);
        }


        queues = CPU_COUNT(&cpus);
        queues = imin(queues, scctx->isc_nrxqsets);
        queues = imin(queues, scctx->isc_ntxqsets);
        requested = queues * 2 + sctx->isc_admin_intrcnt;
        scctx->isc_nrxqsets = queues;
        scctx->isc_ntxqsets = queues;

        vectors = requested;
        if ((err = pci_alloc_msix(dev, &vectors)) != 0) {
                device_printf(dev,
                    "failed to allocate %d MSI-X vectors, err: %d\n", requested,
                    err);
                err = 1;
                goto enic_allocate_msix_out;
        } else {
                if (vectors != requested) {
                        device_printf(dev,
                            "Unable to allocate sufficient MSI-X vectors "
                             "(got %d, need %d)\n", requested, vectors);
                        pci_release_msi(dev);
                        err = 1;
                        goto enic_allocate_msix_out;
                }
        }

        device_printf(dev, "Using MSI-X interrupts with %d vectors\n",
            vectors);

        scctx->isc_intr = IFLIB_INTR_MSIX;
        scctx->isc_vectors = vectors;

enic_allocate_msix_out:
        return (err);

}

static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
        {0,  0}, /* 0  - 4  Gbps */
        {0,  3}, /* 4  - 10 Gbps */
        {3,  6}, /* 10 - 40 Gbps */
};

static void enic_set_rx_coal_setting(struct enic *enic)
{
        unsigned int speed;
        int index = -1;
        struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;

        /* 1. Read the link speed from fw
         * 2. Pick the default range for the speed
         * 3. Update it in enic->rx_coalesce_setting
         */
        speed = vnic_dev_port_speed(enic->vdev);
        if (ENIC_LINK_SPEED_10G < speed)
                index = ENIC_LINK_40G_INDEX;
        else if (ENIC_LINK_SPEED_4G < speed)
                index = ENIC_LINK_10G_INDEX;
        else
                index = ENIC_LINK_4G_INDEX;

        rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
        rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
        rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;

        /* Start with the value provided by UCSM */
        for (index = 0; index < enic->rq_count; index++)
                enic->cq[index].cur_rx_coal_timeval =
                enic->config.intr_timer_usec;

        rx_coal->use_adaptive_rx_coalesce = 1;
}

static int
enic_attach_pre(if_ctx_t ctx)
{
        if_softc_ctx_t  scctx;
        struct enic_softc *softc;
        struct vnic_dev *vdev;
        struct enic *enic;
        device_t dev;

        int err = -1;
        int rc = 0;
        int i;
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        struct vnic_stats *stats;
        int ret;

        dev = iflib_get_dev(ctx);
        softc = iflib_get_softc(ctx);
        softc->dev = dev;
        softc->ctx = ctx;
        softc->sctx = iflib_get_sctx(ctx);
        softc->scctx = iflib_get_softc_ctx(ctx);
        softc->ifp = iflib_get_ifp(ctx);
        softc->media = iflib_get_media(ctx);
        softc->mta = malloc(sizeof(u8) * ETHER_ADDR_LEN *
                ENIC_MAX_MULTICAST_ADDRESSES, M_DEVBUF,
                     M_NOWAIT | M_ZERO);
        if (softc->mta == NULL)
                return (ENOMEM);
        scctx = softc->scctx;

        mtx_init(&softc->enic_lock, "ENIC Lock", NULL, MTX_DEF);

        pci_enable_busmaster(softc->dev);
        if (enic_pci_mapping(softc))
                return (ENXIO);

        enic = &softc->enic;
        enic->softc = softc;
        vdev = &softc->vdev;
        vdev->softc = softc;
        enic->vdev = vdev;
        vdev->priv = enic;

        ENIC_LOCK(softc);
        vnic_dev_register(vdev, &softc->mem, 1);
        enic->vdev = vdev;
        vnic_dev_cmd_init(enic->vdev);

        vdev->devcmd = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD, 0);

        vnic_dev_cmd(vdev, CMD_INIT_v1, &a0, &a1, wait);
        vnic_dev_cmd(vdev, CMD_GET_MAC_ADDR, &a0, &a1, wait);

        bcopy((u_int8_t *) & a0, softc->mac_addr, ETHER_ADDR_LEN);
        iflib_set_mac(ctx, softc->mac_addr);

        vnic_register_cbacks(enic->vdev, enic_alloc_consistent,
            enic_free_consistent);

        /*
         * Allocate the consistent memory for stats and counters upfront so
         * both primary and secondary processes can access them.
         */
        ENIC_UNLOCK(softc);
        err = vnic_dev_alloc_stats_mem(enic->vdev);
        ENIC_LOCK(softc);
        if (err) {
                dev_err(enic, "Failed to allocate cmd memory, aborting\n");
                goto err_out_unregister;
        }
        vnic_dev_stats_clear(enic->vdev);
        ret = vnic_dev_stats_dump(enic->vdev, &stats);
        if (ret) {
                dev_err(enic, "Error in getting stats\n");
                goto err_out_unregister;
        }
        err = vnic_dev_alloc_counter_mem(enic->vdev);
        if (err) {
                dev_err(enic, "Failed to allocate counter memory, aborting\n");
                goto err_out_unregister;
        }

        /* Issue device open to get device in known state */
        err = enic_dev_open(enic);
        if (err) {
                dev_err(enic, "vNIC dev open failed, aborting\n");
                goto err_out_unregister;
        }

        /* Set ingress vlan rewrite mode before vnic initialization */
        enic->ig_vlan_rewrite_mode = IG_VLAN_REWRITE_MODE_UNTAG_DEFAULT_VLAN;
        enic->ig_vlan_rewrite_mode = IG_VLAN_REWRITE_MODE_PRIORITY_TAG_DEFAULT_VLAN;
        err = vnic_dev_set_ig_vlan_rewrite_mode(enic->vdev,
                                                enic->ig_vlan_rewrite_mode);
        if (err) {
                dev_err(enic,
                    "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.
         */

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

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

        enic->port_mtu = vnic_dev_mtu(enic->vdev);

        softc->scctx = iflib_get_softc_ctx(ctx);
        scctx = softc->scctx;
        scctx->isc_txrx = &enic_txrx;
        scctx->isc_capabilities = scctx->isc_capenable = \
                IFCAP_HWCSUM;
        scctx->isc_tx_csum_flags = 0;
        if_setmtu(softc->ifp, enic->config.mtu);
        scctx->isc_max_frame_size = enic->config.mtu + ETHER_HDR_LEN + \
                ETHER_CRC_LEN;
        scctx->isc_nrxqsets_max = enic->conf_rq_count;
        scctx->isc_ntxqsets_max = enic->conf_wq_count;
        scctx->isc_nrxqsets = enic->conf_rq_count;
        scctx->isc_ntxqsets = enic->conf_wq_count;
        for (i = 0; i < enic->conf_wq_count; i++) {
                scctx->isc_ntxd[i] = enic->config.wq_desc_count;
                scctx->isc_txqsizes[i] = sizeof(struct cq_enet_wq_desc)
                        * scctx->isc_ntxd[i];
                scctx->isc_ntxd[i + enic->conf_wq_count] =
                    enic->config.wq_desc_count;
                scctx->isc_txqsizes[i + enic->conf_wq_count] =
                    sizeof(struct cq_desc) * scctx->isc_ntxd[i +
                    enic->conf_wq_count];
        }
        for (i = 0; i < enic->conf_rq_count; i++) {
                scctx->isc_nrxd[i] = enic->config.rq_desc_count;
                scctx->isc_rxqsizes[i] = sizeof(struct cq_enet_rq_desc) *
                    scctx->isc_nrxd[i];
                scctx->isc_nrxd[i + enic->conf_rq_count] =
                    enic->config.rq_desc_count;
                scctx->isc_rxqsizes[i + enic->conf_rq_count] = sizeof(struct
                    cq_desc) * scctx->isc_nrxd[i + enic->conf_rq_count];
        }
        scctx->isc_tx_nsegments = 31;

        scctx->isc_msix_bar = -1;

        ifmedia_add(softc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
        ifmedia_add(softc->media, IFM_ETHER | IFM_40G_SR4, 0, NULL);
        ifmedia_add(softc->media, IFM_ETHER | IFM_10_FL, 0, NULL);

        /*
         * Allocate the CQ here since TX is called first before RX.
         */
        if (softc->enic.cq == NULL)
                softc->enic.cq = malloc(sizeof(struct vnic_cq) *
                     softc->enic.wq_count + softc->enic.rq_count, M_DEVBUF,
                     M_NOWAIT | M_ZERO);
        if (softc->enic.cq == NULL)
                return (ENOMEM);

        /*
         * Allocate the consistent memory for stats and counters upfront so
         * both primary and secondary processes can access them.
         */
        err = vnic_dev_alloc_stats_mem(enic->vdev);
        if (err) {
                dev_err(enic, "Failed to allocate cmd memory, aborting\n");
                goto err_out_dev_close;
        }

        err = enic_allocate_msix(softc);
        if (err) {
                dev_err(enic, "Failed to allocate MSIX, aborting\n");
                goto err_out_dev_close;
        }

        return (rc);

err_out_dev_close:
        vnic_dev_close(enic->vdev);
        vnic_dev_deinit_devcmd2(enic->vdev);
err_out_unregister:
        free(softc->vdev.devcmd, M_DEVBUF);
        free(softc->enic.intr_queues, M_DEVBUF);
        free(softc->enic.cq, M_DEVBUF);
        free(softc->mta, M_DEVBUF);
        rc = -1;
        pci_disable_busmaster(softc->dev);
        enic_pci_mapping_free(softc);
        mtx_destroy(&softc->enic_lock);
        return (rc);
}

static int
enic_msix_intr_assign(if_ctx_t ctx, int msix)
{
        struct enic_softc *softc;
        struct enic *enic;
        if_softc_ctx_t scctx;

        int error;
        int i;
        char irq_name[16];

        softc = iflib_get_softc(ctx);
        enic = &softc->enic;
        scctx = softc->scctx;

        ENIC_LOCK(softc);
        vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSIX);
        ENIC_UNLOCK(softc);

        enic->intr_queues = malloc(sizeof(*enic->intr_queues) *
            enic->conf_intr_count, M_DEVBUF, M_NOWAIT | M_ZERO);
        enic->intr = malloc(sizeof(*enic->intr) * msix, M_DEVBUF, M_NOWAIT
            | M_ZERO);
        for (i = 0; i < scctx->isc_nrxqsets; i++) {
                snprintf(irq_name, sizeof(irq_name), "erxq%d:%d", i,
                    device_get_unit(softc->dev));

                error = iflib_irq_alloc_generic(ctx,
                    &enic->intr_queues[i].intr_irq, i + 1, IFLIB_INTR_RX,
                    enic_rxq_intr, &enic->rq[i], i, irq_name);
                if (error) {
                        device_printf(iflib_get_dev(ctx),
                            "Failed to register rxq %d interrupt handler\n", i);
                        return (error);
                }
                enic->intr[i].index = i;
                enic->intr[i].vdev = enic->vdev;
                ENIC_LOCK(softc);
                enic->intr[i].ctrl = vnic_dev_get_res(enic->vdev,
                    RES_TYPE_INTR_CTRL, i);
                vnic_intr_mask(&enic->intr[i]);
                ENIC_UNLOCK(softc);
        }

        for (i = scctx->isc_nrxqsets; i < scctx->isc_nrxqsets + scctx->isc_ntxqsets; i++) {
                snprintf(irq_name, sizeof(irq_name), "etxq%d:%d", i -
                    scctx->isc_nrxqsets, device_get_unit(softc->dev));

                iflib_softirq_alloc_generic(ctx,
                    &enic->intr_queues[i].intr_irq, IFLIB_INTR_TX,
                    &enic->wq[i - scctx->isc_nrxqsets], i - scctx->isc_nrxqsets,
                    irq_name);

                enic->intr[i].index = i;
                enic->intr[i].vdev = enic->vdev;
                ENIC_LOCK(softc);
                enic->intr[i].ctrl = vnic_dev_get_res(enic->vdev,
                    RES_TYPE_INTR_CTRL, i);
                vnic_intr_mask(&enic->intr[i]);
                ENIC_UNLOCK(softc);
        }

        i = scctx->isc_nrxqsets + scctx->isc_ntxqsets;
        error = iflib_irq_alloc_generic(ctx, &softc->enic_event_intr_irq,
                 i + 1, IFLIB_INTR_ADMIN, enic_event_intr, softc, 0, "event");
        if (error) {
                device_printf(iflib_get_dev(ctx),
                    "Failed to register event interrupt handler\n");
                return (error);
        }

        enic->intr[i].index = i;
        enic->intr[i].vdev = enic->vdev;
        ENIC_LOCK(softc);
        enic->intr[i].ctrl = vnic_dev_get_res(enic->vdev, RES_TYPE_INTR_CTRL,
            i);
        vnic_intr_mask(&enic->intr[i]);
        ENIC_UNLOCK(softc);

        i++;
        error = iflib_irq_alloc_generic(ctx, &softc->enic_err_intr_irq,
                   i + 1, IFLIB_INTR_ADMIN, enic_err_intr, softc, 0, "err");
        if (error) {
                device_printf(iflib_get_dev(ctx),
                    "Failed to register event interrupt handler\n");
                return (error);
        }
        enic->intr[i].index = i;
        enic->intr[i].vdev = enic->vdev;
        ENIC_LOCK(softc);
        enic->intr[i].ctrl = vnic_dev_get_res(enic->vdev, RES_TYPE_INTR_CTRL,
            i);
        vnic_intr_mask(&enic->intr[i]);
        ENIC_UNLOCK(softc);

        enic->intr_count = msix;

        return (0);
}

static void
enic_free_irqs(struct enic_softc *softc)
{
        if_softc_ctx_t  scctx;

        struct enic    *enic;
        int             i;

        scctx = softc->scctx;
        enic = &softc->enic;

        for (i = 0; i < scctx->isc_nrxqsets + scctx->isc_ntxqsets; i++) {
                iflib_irq_free(softc->ctx, &enic->intr_queues[i].intr_irq);
        }

        iflib_irq_free(softc->ctx, &softc->enic_event_intr_irq);
        iflib_irq_free(softc->ctx, &softc->enic_err_intr_irq);
        free(enic->intr_queues, M_DEVBUF);
        free(enic->intr, M_DEVBUF);
}

static int
enic_attach_post(if_ctx_t ctx)
{
        struct enic *enic;
        struct enic_softc *softc;
        int error = 0;

        softc = iflib_get_softc(ctx);
        enic = &softc->enic;

        enic_setup_sysctl(softc);

        enic_init_vnic_resources(enic);
        enic_set_rx_coal_setting(enic);
        enic_setup_finish(enic);

        ifmedia_add(softc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
        ifmedia_set(softc->media, IFM_ETHER | IFM_AUTO);

        return (error);
}

static int
enic_detach(if_ctx_t ctx)
{
        struct enic_softc *softc;
        struct enic *enic;

        softc = iflib_get_softc(ctx);
        enic = &softc->enic;

        vnic_dev_notify_unset(enic->vdev);

        enic_free_irqs(softc);

        ENIC_LOCK(softc);
        vnic_dev_deinit(enic->vdev);
        vnic_dev_close(enic->vdev);
        vnic_dev_deinit_devcmd2(enic->vdev);
        free(softc->vdev.devcmd, M_DEVBUF);
        pci_disable_busmaster(softc->dev);
        enic_pci_mapping_free(softc);
        ENIC_UNLOCK(softc);

        return 0;
}

static int
enic_tx_queues_alloc(if_ctx_t ctx, caddr_t * vaddrs, uint64_t * paddrs,
                     int ntxqs, int ntxqsets)
{
        struct enic_softc *softc;
        int q;

        softc = iflib_get_softc(ctx);
        /* Allocate the array of transmit queues */
        softc->enic.wq = malloc(sizeof(struct vnic_wq) *
                                ntxqsets, M_DEVBUF, M_NOWAIT | M_ZERO);
        if (softc->enic.wq == NULL)
                return (ENOMEM);

        /* Initialize driver state for each transmit queue */

        /*
         * Allocate queue state that is shared with the device.  This check
         * and call is performed in both enic_tx_queues_alloc() and
         * enic_rx_queues_alloc() so that we don't have to care which order
         * iflib invokes those routines in.
         */

        /* Record descriptor ring vaddrs and paddrs */
        ENIC_LOCK(softc);
        for (q = 0; q < ntxqsets; q++) {
                struct vnic_wq *wq;
                struct vnic_cq *cq;
                unsigned int cq_wq;

                wq = &softc->enic.wq[q];
                cq_wq = enic_cq_wq(&softc->enic, q);
                cq = &softc->enic.cq[cq_wq];

                /* Completion ring */
                wq->vdev = softc->enic.vdev;
                wq->index = q;
                wq->ctrl = vnic_dev_get_res(softc->enic.vdev, RES_TYPE_WQ,
                    wq->index);
                vnic_wq_disable(wq);

                wq->ring.desc_size = sizeof(struct wq_enet_desc);
                wq->ring.desc_count = softc->scctx->isc_ntxd[q];
                wq->ring.desc_avail = wq->ring.desc_count - 1;
                wq->ring.last_count = wq->ring.desc_count;
                wq->head_idx = 0;
                wq->tail_idx = 0;

                wq->ring.descs = vaddrs[q * ntxqs + 0];
                wq->ring.base_addr = paddrs[q * ntxqs + 0];

                /* Command ring */
                cq->vdev = softc->enic.vdev;
                cq->index = cq_wq;
                cq->ctrl = vnic_dev_get_res(softc->enic.vdev,
                                            RES_TYPE_CQ, cq->index);
                cq->ring.desc_size = sizeof(struct cq_enet_wq_desc);
                cq->ring.desc_count = softc->scctx->isc_ntxd[q];
                cq->ring.desc_avail = cq->ring.desc_count - 1;

                cq->ring.descs = vaddrs[q * ntxqs + 1];
                cq->ring.base_addr = paddrs[q * ntxqs + 1];

        }

        ENIC_UNLOCK(softc);

        return (0);
}



static int
enic_rx_queues_alloc(if_ctx_t ctx, caddr_t * vaddrs, uint64_t * paddrs,
                     int nrxqs, int nrxqsets)
{
        struct enic_softc *softc;
        int q;

        softc = iflib_get_softc(ctx);
        /* Allocate the array of receive queues */
        softc->enic.rq = malloc(sizeof(struct vnic_rq) * nrxqsets, M_DEVBUF,
            M_NOWAIT | M_ZERO);
        if (softc->enic.rq == NULL)
                return (ENOMEM);

        /* Initialize driver state for each receive queue */

        /*
         * Allocate queue state that is shared with the device.  This check
         * and call is performed in both enic_tx_queues_alloc() and
         * enic_rx_queues_alloc() so that we don't have to care which order
         * iflib invokes those routines in.
         */

        /* Record descriptor ring vaddrs and paddrs */
        ENIC_LOCK(softc);
        for (q = 0; q < nrxqsets; q++) {
                struct vnic_rq *rq;
                struct vnic_cq *cq;
                unsigned int    cq_rq;

                rq = &softc->enic.rq[q];
                cq_rq = enic_cq_rq(&softc->enic, q);
                cq = &softc->enic.cq[cq_rq];

                /* Completion ring */
                cq->vdev = softc->enic.vdev;
                cq->index = cq_rq;
                cq->ctrl = vnic_dev_get_res(softc->enic.vdev, RES_TYPE_CQ,
                    cq->index);
                cq->ring.desc_size = sizeof(struct cq_enet_wq_desc);
                cq->ring.desc_count = softc->scctx->isc_nrxd[1];
                cq->ring.desc_avail = cq->ring.desc_count - 1;

                cq->ring.descs = vaddrs[q * nrxqs + 0];
                cq->ring.base_addr = paddrs[q * nrxqs + 0];

                /* Command ring(s) */
                rq->vdev = softc->enic.vdev;

                rq->index = q;
                rq->ctrl = vnic_dev_get_res(softc->enic.vdev,
                                            RES_TYPE_RQ, rq->index);
                vnic_rq_disable(rq);

                rq->ring.desc_size = sizeof(struct rq_enet_desc);
                rq->ring.desc_count = softc->scctx->isc_nrxd[0];
                rq->ring.desc_avail = rq->ring.desc_count - 1;

                rq->ring.descs = vaddrs[q * nrxqs + 1];
                rq->ring.base_addr = paddrs[q * nrxqs + 1];
                rq->need_initial_post = true;
        }

        ENIC_UNLOCK(softc);

        return (0);
}

static void
enic_queues_free(if_ctx_t ctx)
{
        struct enic_softc *softc;
        softc = iflib_get_softc(ctx);

        free(softc->enic.rq, M_DEVBUF);
        free(softc->enic.wq, M_DEVBUF);
        free(softc->enic.cq, M_DEVBUF);
}

static int
enic_rxq_intr(void *rxq)
{
        struct vnic_rq *rq;
        if_t ifp;

        rq = (struct vnic_rq *)rxq;
        ifp = iflib_get_ifp(rq->vdev->softc->ctx);
        if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0)
                return (FILTER_HANDLED);

        return (FILTER_SCHEDULE_THREAD);
}

static int
enic_event_intr(void *vsc)
{
        struct enic_softc *softc;
        struct enic    *enic;
        uint32_t mtu;

        softc = vsc;
        enic = &softc->enic;

        mtu = vnic_dev_mtu(enic->vdev);
        if (mtu && mtu != enic->port_mtu) {
                enic->port_mtu = mtu;
        }

        enic_link_status(softc);

        return (FILTER_HANDLED);
}

static int
enic_err_intr(void *vsc)
{
        struct enic_softc *softc;

        softc = vsc;

        enic_stop(softc->ctx);
        enic_init(softc->ctx);

        return (FILTER_HANDLED);
}

static void
enic_stop(if_ctx_t ctx)
{
        struct enic_softc *softc;
        struct enic    *enic;
        if_softc_ctx_t  scctx;
        unsigned int    index;
        struct vnic_wq *wq;
        struct vnic_rq *rq;
        struct vnic_cq *cq;
        unsigned int    cq_wq, cq_rq;


        softc = iflib_get_softc(ctx);
        scctx = softc->scctx;
        enic = &softc->enic;

        if (softc->stopped)
                return;
        softc->link_active = 0;
        softc->stopped = 1;

        enic_dev_disable(enic);

        for (index = 0; index < scctx->isc_ntxqsets; index++) {
                enic_stop_wq(enic, index);
                vnic_wq_clean(&enic->wq[index]);
                vnic_cq_clean(&enic->cq[enic_cq_rq(enic, index)]);

                wq = &softc->enic.wq[index];
                wq->ring.desc_avail = wq->ring.desc_count - 1;
                wq->ring.last_count = wq->ring.desc_count;
                wq->head_idx = 0;
                wq->tail_idx = 0;

                cq_wq = enic_cq_wq(&softc->enic, index);
                cq = &softc->enic.cq[cq_wq];
                cq->ring.desc_avail = cq->ring.desc_count - 1;
        }

        for (index = 0; index < scctx->isc_nrxqsets; index++) {
                enic_stop_rq(enic, index);
                vnic_rq_clean(&enic->rq[index]);
                vnic_cq_clean(&enic->cq[enic_cq_wq(enic, index)]);

                rq = &softc->enic.rq[index];
                cq_rq = enic_cq_rq(&softc->enic, index);
                cq = &softc->enic.cq[cq_rq];

                cq->ring.desc_avail = cq->ring.desc_count - 1;
                rq->ring.desc_avail = rq->ring.desc_count - 1;
                rq->need_initial_post = true;
        }

        for (index = 0; index < scctx->isc_vectors; index++) {
                vnic_intr_clean(&enic->intr[index]);
        }
}

static void
enic_init(if_ctx_t ctx)
{
        struct enic_softc *softc;
        struct enic *enic;
        if_softc_ctx_t scctx;
        unsigned int index;

        softc = iflib_get_softc(ctx);
        scctx = softc->scctx;
        enic = &softc->enic;


        enic_init_vnic_resources(enic);

        for (index = 0; index < scctx->isc_ntxqsets; index++)
                enic_prep_wq_for_simple_tx(&softc->enic, index);

        for (index = 0; index < scctx->isc_ntxqsets; index++)
                enic_start_wq(enic, index);

        for (index = 0; index < scctx->isc_nrxqsets; index++)
                enic_start_rq(enic, index);

        /* Use the current MAC address. */
        bcopy(if_getlladdr(softc->ifp), softc->lladdr, ETHER_ADDR_LEN);
        enic_set_lladdr(softc);

        ENIC_LOCK(softc);
        vnic_dev_enable_wait(enic->vdev);
        ENIC_UNLOCK(softc);

        softc->stopped = 0;

        enic_link_status(softc);
}

static void
enic_del_mcast(struct enic_softc *softc) {
        struct enic *enic;
        int i;

        enic = &softc->enic;
        for (i=0; i < softc->mc_count; i++) {
                vnic_dev_del_addr(enic->vdev, &softc->mta[i * ETHER_ADDR_LEN]);
        }
        softc->multicast = 0;
        softc->mc_count = 0;
}

static void
enic_add_mcast(struct enic_softc *softc) {
        struct enic *enic;
        int i;

        enic = &softc->enic;
        for (i=0; i < softc->mc_count; i++) {
                vnic_dev_add_addr(enic->vdev, &softc->mta[i * ETHER_ADDR_LEN]);
        }
        softc->multicast = 1;
}

static u_int
enic_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int idx)
{
        uint8_t *mta = arg;

        if (idx == ENIC_MAX_MULTICAST_ADDRESSES)
                return (0);

        bcopy(LLADDR(sdl), &mta[idx * ETHER_ADDR_LEN], ETHER_ADDR_LEN);
        return (1);
}

static void
enic_multi_set(if_ctx_t ctx)
{
        if_t ifp;
        struct enic_softc *softc;
        u_int count;

        softc = iflib_get_softc(ctx);
        ifp = iflib_get_ifp(ctx);

        ENIC_LOCK(softc);
        enic_del_mcast(softc);
        count = if_foreach_llmaddr(ifp, enic_copy_maddr, softc->mta);
        softc->mc_count = count;
        enic_add_mcast(softc);
        ENIC_UNLOCK(softc);

        if (if_getflags(ifp) & IFF_PROMISC) {
                softc->promisc = 1;
        } else {
                softc->promisc = 0;
        }
        if (if_getflags(ifp) & IFF_ALLMULTI) {
                softc->allmulti = 1;
        } else {
                softc->allmulti = 0;
        }
        enic_update_packet_filter(&softc->enic);
}

static int
enic_mtu_set(if_ctx_t ctx, uint32_t mtu)
{
        struct enic_softc *softc;
        struct enic *enic;
        if_softc_ctx_t scctx = iflib_get_softc_ctx(ctx);

        softc = iflib_get_softc(ctx);
        enic = &softc->enic;

        enic_stop(softc->ctx);
        if (mtu > enic->port_mtu){
                return (EINVAL);
        }

        enic->config.mtu = mtu;
        scctx->isc_max_frame_size = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
        enic_init(softc->ctx);

        return (0);
}

static void
enic_media_status(if_ctx_t ctx, struct ifmediareq *ifmr)
{
        struct enic_softc *softc;
        struct ifmedia_entry *next;
        uint32_t speed;
        uint64_t target_baudrate;

        softc = iflib_get_softc(ctx);

        ifmr->ifm_status = IFM_AVALID;
        ifmr->ifm_active = IFM_ETHER;

        if (enic_link_is_up(softc) != 0) {
                ENIC_LOCK(softc);
                speed = vnic_dev_port_speed(&softc->vdev);
                ENIC_UNLOCK(softc);
                target_baudrate = 1000ull * speed;
                LIST_FOREACH(next, &(iflib_get_media(ctx)->ifm_list), ifm_list) {
                        if (ifmedia_baudrate(next->ifm_media) == target_baudrate) {
                                ifmr->ifm_active |= next->ifm_media;
                        }
                }

                ifmr->ifm_status |= IFM_ACTIVE;
                ifmr->ifm_active |= IFM_AUTO;
        } else
                ifmr->ifm_active |= IFM_NONE;
}

static int
enic_media_change(if_ctx_t ctx)
{
        return (ENODEV);
}

static int
enic_promisc_set(if_ctx_t ctx, int flags)
{
        if_t ifp;
        struct enic_softc *softc;

        softc = iflib_get_softc(ctx);
        ifp = iflib_get_ifp(ctx);

        if (if_getflags(ifp) & IFF_PROMISC) {
                softc->promisc = 1;
        } else {
                softc->promisc = 0;
        }
        if (if_getflags(ifp) & IFF_ALLMULTI) {
                softc->allmulti = 1;
        } else {
                softc->allmulti = 0;
        }
        enic_update_packet_filter(&softc->enic);

        return (0);
}

static uint64_t
enic_get_counter(if_ctx_t ctx, ift_counter cnt) {
        if_t ifp = iflib_get_ifp(ctx);

        if (cnt < IFCOUNTERS)
                return if_get_counter_default(ifp, cnt);

        return (0);
}

static void
enic_update_admin_status(if_ctx_t ctx)
{
        struct enic_softc *softc;
        softc = iflib_get_softc(ctx);

        enic_link_status(softc);
}

static void
enic_txq_timer(if_ctx_t ctx, uint16_t qid)
{

        struct enic_softc *softc;
        struct enic *enic;
        struct vnic_stats *stats;
        int ret;

        softc = iflib_get_softc(ctx);
        enic = &softc->enic;

        ENIC_LOCK(softc);
        ret = vnic_dev_stats_dump(enic->vdev, &stats);
        ENIC_UNLOCK(softc);
        if (ret) {
                dev_err(enic, "Error in getting stats\n");
        }
}

static int
enic_link_is_up(struct enic_softc *softc)
{
        return (vnic_dev_link_status(&softc->vdev) == 1);
}

static void
enic_link_status(struct enic_softc *softc)
{
        if_ctx_t ctx;
        uint64_t speed;
        int link;

        ctx = softc->ctx;
        link = enic_link_is_up(softc);
        speed = IF_Gbps(10);

        ENIC_LOCK(softc);
        speed = vnic_dev_port_speed(&softc->vdev);
        ENIC_UNLOCK(softc);

        if (link != 0 && softc->link_active == 0) {
                softc->link_active = 1;
                iflib_link_state_change(ctx, LINK_STATE_UP, speed);
        } else if (link == 0 && softc->link_active != 0) {
                softc->link_active = 0;
                iflib_link_state_change(ctx, LINK_STATE_DOWN, speed);
        }
}

static void
enic_set_lladdr(struct enic_softc *softc)
{
        struct enic *enic;
        enic = &softc->enic;

        ENIC_LOCK(softc);
        vnic_dev_add_addr(enic->vdev, softc->lladdr);
        ENIC_UNLOCK(softc);
}


static void
enic_setup_txq_sysctl(struct vnic_wq *wq, int i, struct sysctl_ctx_list *ctx,
    struct sysctl_oid_list *child)
{
        struct sysctl_oid *txsnode;
        struct sysctl_oid_list *txslist;
        struct vnic_stats *stats;

        stats = wq[i].vdev->stats;

        txsnode = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "hstats",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Host Statistics");
        txslist = SYSCTL_CHILDREN(txsnode);

        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_frames_ok", CTLFLAG_RD,
           &stats->tx.tx_frames_ok, "TX Frames OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_unicast_frames_ok", CTLFLAG_RD,
           &stats->tx.tx_unicast_frames_ok, "TX unicast frames OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_multicast_frames_ok", CTLFLAG_RD,
            &stats->tx.tx_multicast_frames_ok, "TX multicast framse OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_broadcast_frames_ok", CTLFLAG_RD,
            &stats->tx.tx_broadcast_frames_ok, "TX Broadcast frames OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_bytes_ok", CTLFLAG_RD,
            &stats->tx.tx_bytes_ok, "TX bytes OK ");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_unicast_bytes_ok", CTLFLAG_RD,
            &stats->tx.tx_unicast_bytes_ok, "TX unicast bytes OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_multicast_bytes_ok", CTLFLAG_RD,
            &stats->tx.tx_multicast_bytes_ok, "TX multicast bytes OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_broadcast_bytes_ok", CTLFLAG_RD,
            &stats->tx.tx_broadcast_bytes_ok, "TX broadcast bytes OK");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_drops", CTLFLAG_RD,
            &stats->tx.tx_drops, "TX drops");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_errors", CTLFLAG_RD,
            &stats->tx.tx_errors, "TX errors");
        SYSCTL_ADD_UQUAD(ctx, txslist, OID_AUTO, "tx_tso", CTLFLAG_RD,
            &stats->tx.tx_tso, "TX TSO");
}

static void
enic_setup_rxq_sysctl(struct vnic_rq *rq, int i, struct sysctl_ctx_list *ctx,
    struct sysctl_oid_list *child)
{
        struct sysctl_oid *rxsnode;
        struct sysctl_oid_list *rxslist;
        struct vnic_stats *stats;

        stats = rq[i].vdev->stats;

        rxsnode = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "hstats",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Host Statistics");
        rxslist = SYSCTL_CHILDREN(rxsnode);

        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_ok", CTLFLAG_RD,
            &stats->rx.rx_frames_ok, "RX Frames OK");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_total", CTLFLAG_RD,
            &stats->rx.rx_frames_total, "RX frames total");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_unicast_frames_ok", CTLFLAG_RD,
            &stats->rx.rx_unicast_frames_ok, "RX unicast frames ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_multicast_frames_ok", CTLFLAG_RD,
            &stats->rx.rx_multicast_frames_ok, "RX multicast Frames ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_broadcast_frames_ok", CTLFLAG_RD,
            &stats->rx.rx_broadcast_frames_ok, "RX broadcast frames ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_bytes_ok", CTLFLAG_RD,
            &stats->rx.rx_bytes_ok, "RX bytes ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_unicast_bytes_ok", CTLFLAG_RD,
            &stats->rx.rx_unicast_bytes_ok, "RX unicast bytes ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_multicast_bytes_ok", CTLFLAG_RD,
            &stats->rx.rx_multicast_bytes_ok, "RX multicast bytes ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_broadcast_bytes_ok", CTLFLAG_RD,
            &stats->rx.rx_broadcast_bytes_ok, "RX broadcast bytes ok");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_drop", CTLFLAG_RD,
            &stats->rx.rx_drop, "RX drop");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_errors", CTLFLAG_RD,
            &stats->rx.rx_errors, "RX errors");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_rss", CTLFLAG_RD,
            &stats->rx.rx_rss, "RX rss");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_crc_errors", CTLFLAG_RD,
            &stats->rx.rx_crc_errors, "RX crc errors");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_64", CTLFLAG_RD,
            &stats->rx.rx_frames_64, "RX frames 64");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_127", CTLFLAG_RD,
            &stats->rx.rx_frames_127, "RX frames 127");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_255", CTLFLAG_RD,
            &stats->rx.rx_frames_255, "RX frames 255");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_511", CTLFLAG_RD,
            &stats->rx.rx_frames_511, "RX frames 511");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_1023", CTLFLAG_RD,
            &stats->rx.rx_frames_1023, "RX frames 1023");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_1518", CTLFLAG_RD,
            &stats->rx.rx_frames_1518, "RX frames 1518");
        SYSCTL_ADD_UQUAD(ctx, rxslist, OID_AUTO, "rx_frames_to_max", CTLFLAG_RD,
            &stats->rx.rx_frames_to_max, "RX frames to max");
}

static void
enic_setup_queue_sysctl(struct enic_softc *softc, struct sysctl_ctx_list *ctx,
    struct sysctl_oid_list *child)
{
        enic_setup_txq_sysctl(softc->enic.wq, 0, ctx, child);
        enic_setup_rxq_sysctl(softc->enic.rq, 0, ctx, child);
}

static void
enic_setup_sysctl(struct enic_softc *softc)
{
        device_t dev;
        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        dev = softc->dev;
        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        enic_setup_queue_sysctl(softc, ctx, child);
}

static void
enic_enable_intr(struct enic_softc *softc, int irq)
{
        struct enic *enic = &softc->enic;

        vnic_intr_unmask(&enic->intr[irq]);
        vnic_intr_return_all_credits(&enic->intr[irq]);
}

static void
enic_disable_intr(struct enic_softc *softc, int irq)
{
        struct enic *enic = &softc->enic;

        vnic_intr_mask(&enic->intr[irq]);
        vnic_intr_masked(&enic->intr[irq]);     /* flush write */
}

static int
enic_tx_queue_intr_enable(if_ctx_t ctx, uint16_t qid)
{
        struct enic_softc *softc;
        if_softc_ctx_t scctx;

        softc = iflib_get_softc(ctx);
        scctx = softc->scctx;

        enic_enable_intr(softc, qid + scctx->isc_nrxqsets);

        return 0;
}

static int
enic_rx_queue_intr_enable(if_ctx_t ctx, uint16_t qid)
{
        struct enic_softc *softc;

        softc = iflib_get_softc(ctx);
        enic_enable_intr(softc, qid);

        return 0;
}

static void
enic_intr_enable_all(if_ctx_t ctx)
{
        struct enic_softc *softc;
        if_softc_ctx_t scctx;
        int i;

        softc = iflib_get_softc(ctx);
        scctx = softc->scctx;

        for (i = 0; i < scctx->isc_vectors; i++) {
                enic_enable_intr(softc, i);
        }
}

static void
enic_intr_disable_all(if_ctx_t ctx)
{
        struct enic_softc *softc;
        if_softc_ctx_t scctx;
        int i;

        softc = iflib_get_softc(ctx);
        scctx = softc->scctx;
        /*
         * iflib may invoke this routine before enic_attach_post() has run,
         * which is before the top level shared data area is initialized and
         * the device made aware of it.
         */

        for (i = 0; i < scctx->isc_vectors; i++) {
                enic_disable_intr(softc, i);
        }
}

static int
enic_dev_open(struct enic *enic)
{
        int err;
        int flags = CMD_OPENF_IG_DESCCACHE;

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

        return err;
}

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

        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);

        /* Queue counts may be zeros. rte_zmalloc returns NULL in that case. */
        enic->intr_queues = malloc(sizeof(*enic->intr_queues) *
            enic->conf_intr_count, M_DEVBUF, M_NOWAIT | M_ZERO);

        vnic_dev_set_reset_flag(enic->vdev, 0);
        enic->max_flow_counter = -1;

        /* set up link status checking */
        vnic_dev_notify_set(enic->vdev, -1);    /* No Intr for notify */

        enic->overlay_offload = false;
        if (enic->disable_overlay && enic->vxlan) {
                /*
                 * Explicitly disable overlay offload as the setting is
                 * sticky, and resetting vNIC does not disable it.
                 */
                if (vnic_dev_overlay_offload_ctrl(enic->vdev,
                    OVERLAY_FEATURE_VXLAN, OVERLAY_OFFLOAD_DISABLE)) {
                        dev_err(enic, "failed to disable overlay offload\n");
                } else {
                        dev_info(enic, "Overlay offload is disabled\n");
                }
        }
        if (!enic->disable_overlay && enic->vxlan &&
        /* 'VXLAN feature' enables VXLAN, NVGRE, and GENEVE. */
            vnic_dev_overlay_offload_ctrl(enic->vdev,
            OVERLAY_FEATURE_VXLAN, OVERLAY_OFFLOAD_ENABLE) == 0) {
                enic->overlay_offload = true;
                enic->vxlan_port = ENIC_DEFAULT_VXLAN_PORT;
                dev_info(enic, "Overlay offload is enabled\n");
                /*
                 * Reset the vxlan port to the default, as the NIC firmware
                 * does not reset it automatically and keeps the old setting.
                 */
                if (vnic_dev_overlay_offload_cfg(enic->vdev,
                   OVERLAY_CFG_VXLAN_PORT_UPDATE, ENIC_DEFAULT_VXLAN_PORT)) {
                        dev_err(enic, "failed to update vxlan port\n");
                        return (EINVAL);
                }
        }
        return 0;
}

static void    *
enic_alloc_consistent(void *priv, size_t size, bus_addr_t * dma_handle,
    struct iflib_dma_info *res, u8 * name)
{
        void           *vaddr;
        *dma_handle = 0;
        struct enic    *enic = (struct enic *)priv;
        int             rz;

        rz = iflib_dma_alloc(enic->softc->ctx, size, res, BUS_DMA_NOWAIT);
        if (rz) {
                pr_err("%s : Failed to allocate memory requested for %s\n",
                    __func__, name);
                return NULL;
        }

        vaddr = res->idi_vaddr;
        *dma_handle = res->idi_paddr;

        return vaddr;
}

static void
enic_free_consistent(void *priv, size_t size, void *vaddr,
    bus_addr_t dma_handle, struct iflib_dma_info *res)
{
        iflib_dma_free(res);
}

static int
enic_pci_mapping(struct enic_softc *softc)
{
        int rc;

        rc = enic_map_bar(softc, &softc->mem, 0, true);
        if (rc)
                return rc;

        rc = enic_map_bar(softc, &softc->io, 2, false);

        return rc;
}

static void
enic_pci_mapping_free(struct enic_softc *softc)
{
        if (softc->mem.res != NULL)
                bus_release_resource(softc->dev, SYS_RES_MEMORY,
                                     softc->mem.rid, softc->mem.res);
        softc->mem.res = NULL;

        if (softc->io.res != NULL)
                bus_release_resource(softc->dev, SYS_RES_MEMORY,
                                     softc->io.rid, softc->io.res);
        softc->io.res = NULL;
}

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

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

        /* Wait for func to complete...2 seconds max */
        for (i = 0; i < 2000; i++) {
                err = finished(vdev, &done);
                if (err)
                        return err;
                if (done)
                        return 0;
                usleep(1000);
        }
        return (ETIMEDOUT);
}

static int
enic_map_bar(struct enic_softc *softc, struct enic_bar_info *bar, int bar_num,
    bool shareable)
{
        uint32_t flag;

        if (bar->res != NULL) {
                device_printf(softc->dev, "Bar %d already mapped\n", bar_num);
                return (EDOOFUS);
        }

        bar->rid = PCIR_BAR(bar_num);
        flag = RF_ACTIVE;
        if (shareable)
                flag |= RF_SHAREABLE;

        if ((bar->res = bus_alloc_resource_any(softc->dev,
           SYS_RES_MEMORY, &bar->rid, flag)) == NULL) {
                device_printf(softc->dev,
                              "PCI BAR%d mapping failure\n", bar_num);
                return (ENXIO);
        }
        bar->tag = rman_get_bustag(bar->res);
        bar->handle = rman_get_bushandle(bar->res);
        bar->size = rman_get_size(bar->res);

        return 0;
}

void
enic_init_vnic_resources(struct enic *enic)
{
        unsigned int error_interrupt_enable = 1;
        unsigned int error_interrupt_offset = 0;
        unsigned int rxq_interrupt_enable = 0;
        unsigned int rxq_interrupt_offset = ENICPMD_RXQ_INTR_OFFSET;
        unsigned int txq_interrupt_enable = 0;
        unsigned int txq_interrupt_offset;
        unsigned int index = 0;
        unsigned int cq_idx;
        if_softc_ctx_t scctx;

        scctx = enic->softc->scctx;

        rxq_interrupt_enable = 1;
        txq_interrupt_enable = 0;

        rxq_interrupt_offset = 0;
        txq_interrupt_offset = scctx->isc_nrxqsets;

        for (index = 0; index < enic->intr_count; index++) {
                vnic_intr_alloc(enic->vdev, &enic->intr[index], index);
        }

        for (index = 0; index < scctx->isc_nrxqsets; index++) {
                cq_idx = enic_cq_rq(enic, index);

                vnic_rq_clean(&enic->rq[index]);
                vnic_rq_init(&enic->rq[index], cq_idx, error_interrupt_enable,
                    error_interrupt_offset);

                vnic_cq_clean(&enic->cq[cq_idx]);
                vnic_cq_init(&enic->cq[cq_idx],
                    0 /* flow_control_enable */ ,
                    1 /* color_enable */ ,
                    0 /* cq_head */ ,
                    0 /* cq_tail */ ,
                    1 /* cq_tail_color */ ,
                    rxq_interrupt_enable,
                    1 /* cq_entry_enable */ ,
                    0 /* cq_message_enable */ ,
                    rxq_interrupt_offset,
                    0 /* cq_message_addr */ );
                if (rxq_interrupt_enable)
                        rxq_interrupt_offset++;
        }

        for (index = 0; index < scctx->isc_ntxqsets; index++) {
                cq_idx = enic_cq_wq(enic, index);
                vnic_wq_clean(&enic->wq[index]);
                vnic_wq_init(&enic->wq[index], cq_idx, error_interrupt_enable,
                    error_interrupt_offset);
                /* Compute unsupported ol flags for enic_prep_pkts() */
                enic->wq[index].tx_offload_notsup_mask = 0;

                vnic_cq_clean(&enic->cq[cq_idx]);
                vnic_cq_init(&enic->cq[cq_idx],
                   0 /* flow_control_enable */ ,
                   1 /* color_enable */ ,
                   0 /* cq_head */ ,
                   0 /* cq_tail */ ,
                   1 /* cq_tail_color */ ,
                   txq_interrupt_enable,
                   1,
                   0,
                   txq_interrupt_offset,
                   0 /* (u64)enic->wq[index].cqmsg_rz->iova */ );

        }

        for (index = 0; index < enic->intr_count; index++) {
                vnic_intr_init(&enic->intr[index], 125,
                    enic->config.intr_timer_type, /* mask_on_assertion */ 1);
        }
}

static void
enic_update_packet_filter(struct enic *enic)
{
        struct enic_softc *softc = enic->softc;

        ENIC_LOCK(softc);
        vnic_dev_packet_filter(enic->vdev,
            softc->directed,
            softc->multicast,
            softc->broadcast,
            softc->promisc,
            softc->allmulti);
        ENIC_UNLOCK(softc);
}

static bool
enic_if_needs_restart(if_ctx_t ctx, enum iflib_restart_event event)
{
        switch (event) {
        case IFLIB_RESTART_VLAN_CONFIG:
        default:
                return (false);
        }
}

int
enic_setup_finish(struct enic *enic)
{
        struct enic_softc *softc = enic->softc;

        /* Default conf */
        softc->directed = 1;
        softc->multicast = 0;
        softc->broadcast = 1;
        softc->promisc = 0;
        softc->allmulti = 1;
        enic_update_packet_filter(enic);

        return 0;
}