/**********************************************************************
 * Author: Cavium, Inc.
 *
 * Contact: support@cavium.com
 *          Please include "LiquidIO" in the subject.
 *
 * Copyright (c) 2003-2016 Cavium, Inc.
 *
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, Version 2, as
 * published by the Free Software Foundation.
 *
 * This file is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT.  See the GNU General Public License for more details.
 ***********************************************************************/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <net/vxlan.h>
#include "liquidio_common.h"
#include "octeon_droq.h"
#include "octeon_iq.h"
#include "response_manager.h"
#include "octeon_device.h"
#include "octeon_nic.h"
#include "octeon_main.h"
#include "octeon_network.h"
#include "cn23xx_vf_device.h"

MODULE_AUTHOR("Cavium Networks, <support@cavium.com>");
MODULE_DESCRIPTION("Cavium LiquidIO Intelligent Server Adapter Virtual Function Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(LIQUIDIO_VERSION);

static int debug = -1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "NETIF_MSG debug bits");

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)

struct liquidio_rx_ctl_context {
        int octeon_id;

        wait_queue_head_t wc;

        int cond;
};

struct oct_timestamp_resp {
        u64 rh;
        u64 timestamp;
        u64 status;
};

union tx_info {
        u64 u64;
        struct {
#ifdef __BIG_ENDIAN_BITFIELD
                u16 gso_size;
                u16 gso_segs;
                u32 reserved;
#else
                u32 reserved;
                u16 gso_segs;
                u16 gso_size;
#endif
        } s;
};

#define OCTNIC_GSO_MAX_HEADER_SIZE 128
#define OCTNIC_GSO_MAX_SIZE \
                (CN23XX_DEFAULT_INPUT_JABBER - OCTNIC_GSO_MAX_HEADER_SIZE)

static int
liquidio_vf_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void liquidio_vf_remove(struct pci_dev *pdev);
static int octeon_device_init(struct octeon_device *oct);
static int liquidio_stop(struct net_device *netdev);

static int lio_wait_for_oq_pkts(struct octeon_device *oct)
{
        struct octeon_device_priv *oct_priv =
            (struct octeon_device_priv *)oct->priv;
        int retry = MAX_IO_PENDING_PKT_COUNT;
        int pkt_cnt = 0, pending_pkts;
        int i;

        do {
                pending_pkts = 0;

                for (i = 0; i < MAX_OCTEON_OUTPUT_QUEUES(oct); i++) {
                        if (!(oct->io_qmask.oq & BIT_ULL(i)))
                                continue;
                        pkt_cnt += octeon_droq_check_hw_for_pkts(oct->droq[i]);
                }
                if (pkt_cnt > 0) {
                        pending_pkts += pkt_cnt;
                        tasklet_schedule(&oct_priv->droq_tasklet);
                }
                pkt_cnt = 0;
                schedule_timeout_uninterruptible(1);

        } while (retry-- && pending_pkts);

        return pkt_cnt;
}

/**
 * \brief Cause device to go quiet so it can be safely removed/reset/etc
 * @param oct Pointer to Octeon device
 */
static void pcierror_quiesce_device(struct octeon_device *oct)
{
        int i;

        /* Disable the input and output queues now. No more packets will
         * arrive from Octeon, but we should wait for all packet processing
         * to finish.
         */

        /* To allow for in-flight requests */
        schedule_timeout_uninterruptible(100);

        if (wait_for_pending_requests(oct))
                dev_err(&oct->pci_dev->dev, "There were pending requests\n");

        /* Force all requests waiting to be fetched by OCTEON to complete. */
        for (i = 0; i < MAX_OCTEON_INSTR_QUEUES(oct); i++) {
                struct octeon_instr_queue *iq;

                if (!(oct->io_qmask.iq & BIT_ULL(i)))
                        continue;
                iq = oct->instr_queue[i];

                if (atomic_read(&iq->instr_pending)) {
                        spin_lock_bh(&iq->lock);
                        iq->fill_cnt = 0;
                        iq->octeon_read_index = iq->host_write_index;
                        iq->stats.instr_processed +=
                            atomic_read(&iq->instr_pending);
                        lio_process_iq_request_list(oct, iq, 0);
                        spin_unlock_bh(&iq->lock);
                }
        }

        /* Force all pending ordered list requests to time out. */
        lio_process_ordered_list(oct, 1);

        /* We do not need to wait for output queue packets to be processed. */
}

/**
 * \brief Cleanup PCI AER uncorrectable error status
 * @param dev Pointer to PCI device
 */
static void cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
{
        u32 status, mask;
        int pos = 0x100;

        pr_info("%s :\n", __func__);

        pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
        pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
        if (dev->error_state == pci_channel_io_normal)
                status &= ~mask; /* Clear corresponding nonfatal bits */
        else
                status &= mask; /* Clear corresponding fatal bits */
        pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
}

/**
 * \brief Stop all PCI IO to a given device
 * @param dev Pointer to Octeon device
 */
static void stop_pci_io(struct octeon_device *oct)
{
        struct msix_entry *msix_entries;
        int i;

        /* No more instructions will be forwarded. */
        atomic_set(&oct->status, OCT_DEV_IN_RESET);

        for (i = 0; i < oct->ifcount; i++)
                netif_device_detach(oct->props[i].netdev);

        /* Disable interrupts  */
        oct->fn_list.disable_interrupt(oct, OCTEON_ALL_INTR);

        pcierror_quiesce_device(oct);
        if (oct->msix_on) {
                msix_entries = (struct msix_entry *)oct->msix_entries;
                for (i = 0; i < oct->num_msix_irqs; i++) {
                        /* clear the affinity_cpumask */
                        irq_set_affinity_hint(msix_entries[i].vector,
                                              NULL);
                        free_irq(msix_entries[i].vector,
                                 &oct->ioq_vector[i]);
                }
                pci_disable_msix(oct->pci_dev);
                kfree(oct->msix_entries);
                oct->msix_entries = NULL;
                octeon_free_ioq_vector(oct);
        }
        dev_dbg(&oct->pci_dev->dev, "Device state is now %s\n",
                lio_get_state_string(&oct->status));

        /* making it a common function for all OCTEON models */
        cleanup_aer_uncorrect_error_status(oct->pci_dev);

        pci_disable_device(oct->pci_dev);
}

/**
 * \brief called when PCI error is detected
 * @param pdev Pointer to PCI device
 * @param state The current pci connection state
 *
 * This function is called after a PCI bus error affecting
 * this device has been detected.
 */
static pci_ers_result_t liquidio_pcie_error_detected(struct pci_dev *pdev,
                                                     pci_channel_state_t state)
{
        struct octeon_device *oct = pci_get_drvdata(pdev);

        /* Non-correctable Non-fatal errors */
        if (state == pci_channel_io_normal) {
                dev_err(&oct->pci_dev->dev, "Non-correctable non-fatal error reported:\n");
                cleanup_aer_uncorrect_error_status(oct->pci_dev);
                return PCI_ERS_RESULT_CAN_RECOVER;
        }

        /* Non-correctable Fatal errors */
        dev_err(&oct->pci_dev->dev, "Non-correctable FATAL reported by PCI AER driver\n");
        stop_pci_io(oct);

        return PCI_ERS_RESULT_DISCONNECT;
}

/* For PCI-E Advanced Error Recovery (AER) Interface */
static const struct pci_error_handlers liquidio_vf_err_handler = {
        .error_detected = liquidio_pcie_error_detected,
};

static const struct pci_device_id liquidio_vf_pci_tbl[] = {
        {
                PCI_VENDOR_ID_CAVIUM, OCTEON_CN23XX_VF_VID,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0
        },
        {
                0, 0, 0, 0, 0, 0, 0
        }
};
MODULE_DEVICE_TABLE(pci, liquidio_vf_pci_tbl);

static struct pci_driver liquidio_vf_pci_driver = {
        .name           = "LiquidIO_VF",
        .id_table       = liquidio_vf_pci_tbl,
        .probe          = liquidio_vf_probe,
        .remove         = liquidio_vf_remove,
        .err_handler    = &liquidio_vf_err_handler,    /* For AER */
};

/**
 * \brief Print link information
 * @param netdev network device
 */
static void print_link_info(struct net_device *netdev)
{
        struct lio *lio = GET_LIO(netdev);

        if (!ifstate_check(lio, LIO_IFSTATE_RESETTING) &&
            ifstate_check(lio, LIO_IFSTATE_REGISTERED)) {
                struct oct_link_info *linfo = &lio->linfo;

                if (linfo->link.s.link_up) {
                        netif_info(lio, link, lio->netdev, "%d Mbps %s Duplex UP\n",
                                   linfo->link.s.speed,
                                   (linfo->link.s.duplex) ? "Full" : "Half");
                } else {
                        netif_info(lio, link, lio->netdev, "Link Down\n");
                }
        }
}

/**
 * \brief Routine to notify MTU change
 * @param work work_struct data structure
 */
static void octnet_link_status_change(struct work_struct *work)
{
        struct cavium_wk *wk = (struct cavium_wk *)work;
        struct lio *lio = (struct lio *)wk->ctxptr;

        /* lio->linfo.link.s.mtu always contains max MTU of the lio interface.
         * this API is invoked only when new max-MTU of the interface is
         * less than current MTU.
         */
        rtnl_lock();
        dev_set_mtu(lio->netdev, lio->linfo.link.s.mtu);
        rtnl_unlock();
}

/**
 * \brief Sets up the mtu status change work
 * @param netdev network device
 */
static int setup_link_status_change_wq(struct net_device *netdev)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;

        lio->link_status_wq.wq = alloc_workqueue("link-status",
                                                 WQ_MEM_RECLAIM, 0);
        if (!lio->link_status_wq.wq) {
                dev_err(&oct->pci_dev->dev, "unable to create cavium link status wq\n");
                return -1;
        }
        INIT_DELAYED_WORK(&lio->link_status_wq.wk.work,
                          octnet_link_status_change);
        lio->link_status_wq.wk.ctxptr = lio;

        return 0;
}

static void cleanup_link_status_change_wq(struct net_device *netdev)
{
        struct lio *lio = GET_LIO(netdev);

        if (lio->link_status_wq.wq) {
                cancel_delayed_work_sync(&lio->link_status_wq.wk.work);
                destroy_workqueue(lio->link_status_wq.wq);
        }
}

/**
 * \brief Update link status
 * @param netdev network device
 * @param ls link status structure
 *
 * Called on receipt of a link status response from the core application to
 * update each interface's link status.
 */
static void update_link_status(struct net_device *netdev,
                               union oct_link_status *ls)
{
        struct lio *lio = GET_LIO(netdev);
        int current_max_mtu = lio->linfo.link.s.mtu;
        struct octeon_device *oct = lio->oct_dev;

        if ((lio->intf_open) && (lio->linfo.link.u64 != ls->u64)) {
                lio->linfo.link.u64 = ls->u64;

                print_link_info(netdev);
                lio->link_changes++;

                if (lio->linfo.link.s.link_up) {
                        netif_carrier_on(netdev);
                        wake_txqs(netdev);
                } else {
                        netif_carrier_off(netdev);
                        stop_txqs(netdev);
                }

                if (lio->linfo.link.s.mtu != current_max_mtu) {
                        dev_info(&oct->pci_dev->dev,
                                 "Max MTU Changed from %d to %d\n",
                                 current_max_mtu, lio->linfo.link.s.mtu);
                        netdev->max_mtu = lio->linfo.link.s.mtu;
                }

                if (lio->linfo.link.s.mtu < netdev->mtu) {
                        dev_warn(&oct->pci_dev->dev,
                                 "Current MTU is higher than new max MTU; Reducing the current mtu from %d to %d\n",
                                 netdev->mtu, lio->linfo.link.s.mtu);
                        queue_delayed_work(lio->link_status_wq.wq,
                                           &lio->link_status_wq.wk.work, 0);
                }
        }
}

/**
 * \brief PCI probe handler
 * @param pdev PCI device structure
 * @param ent unused
 */
static int
liquidio_vf_probe(struct pci_dev *pdev,
                  const struct pci_device_id *ent __attribute__((unused)))
{
        struct octeon_device *oct_dev = NULL;

        oct_dev = octeon_allocate_device(pdev->device,
                                         sizeof(struct octeon_device_priv));

        if (!oct_dev) {
                dev_err(&pdev->dev, "Unable to allocate device\n");
                return -ENOMEM;
        }
        oct_dev->msix_on = LIO_FLAG_MSIX_ENABLED;

        dev_info(&pdev->dev, "Initializing device %x:%x.\n",
                 (u32)pdev->vendor, (u32)pdev->device);

        /* mark hardware as deprecated in RHEL8 */
        mark_hardware_deprecated(DRV_NAME);

        /* Assign octeon_device for this device to the private data area. */
        pci_set_drvdata(pdev, oct_dev);

        /* set linux specific device pointer */
        oct_dev->pci_dev = pdev;

        oct_dev->subsystem_id = pdev->subsystem_vendor |
                (pdev->subsystem_device << 16);

        if (octeon_device_init(oct_dev)) {
                liquidio_vf_remove(pdev);
                return -ENOMEM;
        }

        dev_dbg(&oct_dev->pci_dev->dev, "Device is ready\n");

        return 0;
}

/**
 * \brief PCI FLR for each Octeon device.
 * @param oct octeon device
 */
static void octeon_pci_flr(struct octeon_device *oct)
{
        pci_save_state(oct->pci_dev);

        pci_cfg_access_lock(oct->pci_dev);

        /* Quiesce the device completely */
        pci_write_config_word(oct->pci_dev, PCI_COMMAND,
                              PCI_COMMAND_INTX_DISABLE);

        pcie_flr(oct->pci_dev);

        pci_cfg_access_unlock(oct->pci_dev);

        pci_restore_state(oct->pci_dev);
}

/**
 *\brief Destroy resources associated with octeon device
 * @param pdev PCI device structure
 * @param ent unused
 */
static void octeon_destroy_resources(struct octeon_device *oct)
{
        struct msix_entry *msix_entries;
        int i;

        switch (atomic_read(&oct->status)) {
        case OCT_DEV_RUNNING:
        case OCT_DEV_CORE_OK:
                /* No more instructions will be forwarded. */
                atomic_set(&oct->status, OCT_DEV_IN_RESET);

                oct->app_mode = CVM_DRV_INVALID_APP;
                dev_dbg(&oct->pci_dev->dev, "Device state is now %s\n",
                        lio_get_state_string(&oct->status));

                schedule_timeout_uninterruptible(HZ / 10);

                /* fallthrough */
        case OCT_DEV_HOST_OK:
                /* fallthrough */
        case OCT_DEV_IO_QUEUES_DONE:
                if (wait_for_pending_requests(oct))
                        dev_err(&oct->pci_dev->dev, "There were pending requests\n");

                if (lio_wait_for_instr_fetch(oct))
                        dev_err(&oct->pci_dev->dev, "IQ had pending instructions\n");

                /* Disable the input and output queues now. No more packets will
                 * arrive from Octeon, but we should wait for all packet
                 * processing to finish.
                 */
                oct->fn_list.disable_io_queues(oct);

                if (lio_wait_for_oq_pkts(oct))
                        dev_err(&oct->pci_dev->dev, "OQ had pending packets\n");
                /* fall through */
        case OCT_DEV_INTR_SET_DONE:
                /* Disable interrupts  */
                oct->fn_list.disable_interrupt(oct, OCTEON_ALL_INTR);

                if (oct->msix_on) {
                        msix_entries = (struct msix_entry *)oct->msix_entries;
                        for (i = 0; i < oct->num_msix_irqs; i++) {
                                if (oct->ioq_vector[i].vector) {
                                        irq_set_affinity_hint(
                                                        msix_entries[i].vector,
                                                        NULL);
                                        free_irq(msix_entries[i].vector,
                                                 &oct->ioq_vector[i]);
                                        oct->ioq_vector[i].vector = 0;
                                }
                        }
                        pci_disable_msix(oct->pci_dev);
                        kfree(oct->msix_entries);
                        oct->msix_entries = NULL;
                        kfree(oct->irq_name_storage);
                        oct->irq_name_storage = NULL;
                }
                /* Soft reset the octeon device before exiting */
                if (oct->pci_dev->reset_fn)
                        octeon_pci_flr(oct);
                else
                        cn23xx_vf_ask_pf_to_do_flr(oct);

                /* fallthrough */
        case OCT_DEV_MSIX_ALLOC_VECTOR_DONE:
                octeon_free_ioq_vector(oct);

                /* fallthrough */
        case OCT_DEV_MBOX_SETUP_DONE:
                oct->fn_list.free_mbox(oct);

                /* fallthrough */
        case OCT_DEV_IN_RESET:
        case OCT_DEV_DROQ_INIT_DONE:
                mdelay(100);
                for (i = 0; i < MAX_OCTEON_OUTPUT_QUEUES(oct); i++) {
                        if (!(oct->io_qmask.oq & BIT_ULL(i)))
                                continue;
                        octeon_delete_droq(oct, i);
                }

                /* fallthrough */
        case OCT_DEV_RESP_LIST_INIT_DONE:
                octeon_delete_response_list(oct);

                /* fallthrough */
        case OCT_DEV_INSTR_QUEUE_INIT_DONE:
                for (i = 0; i < MAX_OCTEON_INSTR_QUEUES(oct); i++) {
                        if (!(oct->io_qmask.iq & BIT_ULL(i)))
                                continue;
                        octeon_delete_instr_queue(oct, i);
                }

                /* fallthrough */
        case OCT_DEV_SC_BUFF_POOL_INIT_DONE:
                octeon_free_sc_buffer_pool(oct);

                /* fallthrough */
        case OCT_DEV_DISPATCH_INIT_DONE:
                octeon_delete_dispatch_list(oct);
                cancel_delayed_work_sync(&oct->nic_poll_work.work);

                /* fallthrough */
        case OCT_DEV_PCI_MAP_DONE:
                octeon_unmap_pci_barx(oct, 0);
                octeon_unmap_pci_barx(oct, 1);

                /* fallthrough */
        case OCT_DEV_PCI_ENABLE_DONE:
                pci_clear_master(oct->pci_dev);
                /* Disable the device, releasing the PCI INT */
                pci_disable_device(oct->pci_dev);

                /* fallthrough */
        case OCT_DEV_BEGIN_STATE:
                /* Nothing to be done here either */
                break;
        }
}

/**
 * \brief Callback for rx ctrl
 * @param status status of request
 * @param buf pointer to resp structure
 */
static void rx_ctl_callback(struct octeon_device *oct,
                            u32 status, void *buf)
{
        struct octeon_soft_command *sc = (struct octeon_soft_command *)buf;
        struct liquidio_rx_ctl_context *ctx;

        ctx  = (struct liquidio_rx_ctl_context *)sc->ctxptr;

        oct = lio_get_device(ctx->octeon_id);
        if (status)
                dev_err(&oct->pci_dev->dev, "rx ctl instruction failed. Status: %llx\n",
                        CVM_CAST64(status));
        WRITE_ONCE(ctx->cond, 1);

        /* This barrier is required to be sure that the response has been
         * written fully before waking up the handler
         */
        wmb();

        wake_up_interruptible(&ctx->wc);
}

/**
 * \brief Send Rx control command
 * @param lio per-network private data
 * @param start_stop whether to start or stop
 */
static void send_rx_ctrl_cmd(struct lio *lio, int start_stop)
{
        struct octeon_device *oct = (struct octeon_device *)lio->oct_dev;
        int ctx_size = sizeof(struct liquidio_rx_ctl_context);
        struct liquidio_rx_ctl_context *ctx;
        struct octeon_soft_command *sc;
        union octnet_cmd *ncmd;
        int retval;

        if (oct->props[lio->ifidx].rx_on == start_stop)
                return;

        sc = (struct octeon_soft_command *)
                octeon_alloc_soft_command(oct, OCTNET_CMD_SIZE,
                                          16, ctx_size);

        ncmd = (union octnet_cmd *)sc->virtdptr;
        ctx  = (struct liquidio_rx_ctl_context *)sc->ctxptr;

        WRITE_ONCE(ctx->cond, 0);
        ctx->octeon_id = lio_get_device_id(oct);
        init_waitqueue_head(&ctx->wc);

        ncmd->u64 = 0;
        ncmd->s.cmd = OCTNET_CMD_RX_CTL;
        ncmd->s.param1 = start_stop;

        octeon_swap_8B_data((u64 *)ncmd, (OCTNET_CMD_SIZE >> 3));

        sc->iq_no = lio->linfo.txpciq[0].s.q_no;

        octeon_prepare_soft_command(oct, sc, OPCODE_NIC,
                                    OPCODE_NIC_CMD, 0, 0, 0);

        sc->callback = rx_ctl_callback;
        sc->callback_arg = sc;
        sc->wait_time = 5000;

        retval = octeon_send_soft_command(oct, sc);
        if (retval == IQ_SEND_FAILED) {
                netif_info(lio, rx_err, lio->netdev, "Failed to send RX Control message\n");
        } else {
                /* Sleep on a wait queue till the cond flag indicates that the
                 * response arrived or timed-out.
                 */
                if (sleep_cond(&ctx->wc, &ctx->cond) == -EINTR)
                        return;
                oct->props[lio->ifidx].rx_on = start_stop;
        }

        octeon_free_soft_command(oct, sc);
}

/**
 * \brief Destroy NIC device interface
 * @param oct octeon device
 * @param ifidx which interface to destroy
 *
 * Cleanup associated with each interface for an Octeon device  when NIC
 * module is being unloaded or if initialization fails during load.
 */
static void liquidio_destroy_nic_device(struct octeon_device *oct, int ifidx)
{
        struct net_device *netdev = oct->props[ifidx].netdev;
        struct napi_struct *napi, *n;
        struct lio *lio;

        if (!netdev) {
                dev_err(&oct->pci_dev->dev, "%s No netdevice ptr for index %d\n",
                        __func__, ifidx);
                return;
        }

        lio = GET_LIO(netdev);

        dev_dbg(&oct->pci_dev->dev, "NIC device cleanup\n");

        if (atomic_read(&lio->ifstate) & LIO_IFSTATE_RUNNING)
                liquidio_stop(netdev);

        if (oct->props[lio->ifidx].napi_enabled == 1) {
                list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
                        napi_disable(napi);

                oct->props[lio->ifidx].napi_enabled = 0;

                oct->droq[0]->ops.poll_mode = 0;
        }

        /* Delete NAPI */
        list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
                netif_napi_del(napi);

        if (atomic_read(&lio->ifstate) & LIO_IFSTATE_REGISTERED)
                unregister_netdev(netdev);

        cleanup_rx_oom_poll_fn(netdev);

        cleanup_link_status_change_wq(netdev);

        lio_delete_glists(lio);

        free_netdev(netdev);

        oct->props[ifidx].gmxport = -1;

        oct->props[ifidx].netdev = NULL;
}

/**
 * \brief Stop complete NIC functionality
 * @param oct octeon device
 */
static int liquidio_stop_nic_module(struct octeon_device *oct)
{
        struct lio *lio;
        int i, j;

        dev_dbg(&oct->pci_dev->dev, "Stopping network interfaces\n");
        if (!oct->ifcount) {
                dev_err(&oct->pci_dev->dev, "Init for Octeon was not completed\n");
                return 1;
        }

        spin_lock_bh(&oct->cmd_resp_wqlock);
        oct->cmd_resp_state = OCT_DRV_OFFLINE;
        spin_unlock_bh(&oct->cmd_resp_wqlock);

        for (i = 0; i < oct->ifcount; i++) {
                lio = GET_LIO(oct->props[i].netdev);
                for (j = 0; j < oct->num_oqs; j++)
                        octeon_unregister_droq_ops(oct,
                                                   lio->linfo.rxpciq[j].s.q_no);
        }

        for (i = 0; i < oct->ifcount; i++)
                liquidio_destroy_nic_device(oct, i);

        dev_dbg(&oct->pci_dev->dev, "Network interfaces stopped\n");
        return 0;
}

/**
 * \brief Cleans up resources at unload time
 * @param pdev PCI device structure
 */
static void liquidio_vf_remove(struct pci_dev *pdev)
{
        struct octeon_device *oct_dev = pci_get_drvdata(pdev);

        dev_dbg(&oct_dev->pci_dev->dev, "Stopping device\n");

        if (oct_dev->app_mode == CVM_DRV_NIC_APP)
                liquidio_stop_nic_module(oct_dev);

        /* Reset the octeon device and cleanup all memory allocated for
         * the octeon device by driver.
         */
        octeon_destroy_resources(oct_dev);

        dev_info(&oct_dev->pci_dev->dev, "Device removed\n");

        /* This octeon device has been removed. Update the global
         * data structure to reflect this. Free the device structure.
         */
        octeon_free_device_mem(oct_dev);
}

/**
 * \brief PCI initialization for each Octeon device.
 * @param oct octeon device
 */
static int octeon_pci_os_setup(struct octeon_device *oct)
{
#ifdef CONFIG_PCI_IOV
        /* setup PCI stuff first */
        if (!oct->pci_dev->physfn)
                octeon_pci_flr(oct);
#endif

        if (pci_enable_device(oct->pci_dev)) {
                dev_err(&oct->pci_dev->dev, "pci_enable_device failed\n");
                return 1;
        }

        if (dma_set_mask_and_coherent(&oct->pci_dev->dev, DMA_BIT_MASK(64))) {
                dev_err(&oct->pci_dev->dev, "Unexpected DMA device capability\n");
                pci_disable_device(oct->pci_dev);
                return 1;
        }

        /* Enable PCI DMA Master. */
        pci_set_master(oct->pci_dev);

        return 0;
}

/**
 * \brief Unmap and free network buffer
 * @param buf buffer
 */
static void free_netbuf(void *buf)
{
        struct octnet_buf_free_info *finfo;
        struct sk_buff *skb;
        struct lio *lio;

        finfo = (struct octnet_buf_free_info *)buf;
        skb = finfo->skb;
        lio = finfo->lio;

        dma_unmap_single(&lio->oct_dev->pci_dev->dev, finfo->dptr, skb->len,
                         DMA_TO_DEVICE);

        tx_buffer_free(skb);
}

/**
 * \brief Unmap and free gather buffer
 * @param buf buffer
 */
static void free_netsgbuf(void *buf)
{
        struct octnet_buf_free_info *finfo;
        struct octnic_gather *g;
        struct sk_buff *skb;
        int i, frags, iq;
        struct lio *lio;

        finfo = (struct octnet_buf_free_info *)buf;
        skb = finfo->skb;
        lio = finfo->lio;
        g = finfo->g;
        frags = skb_shinfo(skb)->nr_frags;

        dma_unmap_single(&lio->oct_dev->pci_dev->dev,
                         g->sg[0].ptr[0], (skb->len - skb->data_len),
                         DMA_TO_DEVICE);

        i = 1;
        while (frags--) {
                struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1];

                pci_unmap_page((lio->oct_dev)->pci_dev,
                               g->sg[(i >> 2)].ptr[(i & 3)],
                               frag->size, DMA_TO_DEVICE);
                i++;
        }

        iq = skb_iq(lio->oct_dev, skb);

        spin_lock(&lio->glist_lock[iq]);
        list_add_tail(&g->list, &lio->glist[iq]);
        spin_unlock(&lio->glist_lock[iq]);

        tx_buffer_free(skb);
}

/**
 * \brief Unmap and free gather buffer with response
 * @param buf buffer
 */
static void free_netsgbuf_with_resp(void *buf)
{
        struct octnet_buf_free_info *finfo;
        struct octeon_soft_command *sc;
        struct octnic_gather *g;
        struct sk_buff *skb;
        int i, frags, iq;
        struct lio *lio;

        sc = (struct octeon_soft_command *)buf;
        skb = (struct sk_buff *)sc->callback_arg;
        finfo = (struct octnet_buf_free_info *)&skb->cb;

        lio = finfo->lio;
        g = finfo->g;
        frags = skb_shinfo(skb)->nr_frags;

        dma_unmap_single(&lio->oct_dev->pci_dev->dev,
                         g->sg[0].ptr[0], (skb->len - skb->data_len),
                         DMA_TO_DEVICE);

        i = 1;
        while (frags--) {
                struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1];

                pci_unmap_page((lio->oct_dev)->pci_dev,
                               g->sg[(i >> 2)].ptr[(i & 3)],
                               frag->size, DMA_TO_DEVICE);
                i++;
        }

        iq = skb_iq(lio->oct_dev, skb);

        spin_lock(&lio->glist_lock[iq]);
        list_add_tail(&g->list, &lio->glist[iq]);
        spin_unlock(&lio->glist_lock[iq]);

        /* Don't free the skb yet */
}

/**
 * \brief Net device open for LiquidIO
 * @param netdev network device
 */
static int liquidio_open(struct net_device *netdev)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct napi_struct *napi, *n;

        if (!oct->props[lio->ifidx].napi_enabled) {
                list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
                        napi_enable(napi);

                oct->props[lio->ifidx].napi_enabled = 1;

                oct->droq[0]->ops.poll_mode = 1;
        }

        ifstate_set(lio, LIO_IFSTATE_RUNNING);

        /* Ready for link status updates */
        lio->intf_open = 1;

        netif_info(lio, ifup, lio->netdev, "Interface Open, ready for traffic\n");
        start_txqs(netdev);

        /* tell Octeon to start forwarding packets to host */
        send_rx_ctrl_cmd(lio, 1);

        dev_info(&oct->pci_dev->dev, "%s interface is opened\n", netdev->name);

        return 0;
}

/**
 * \brief Net device stop for LiquidIO
 * @param netdev network device
 */
static int liquidio_stop(struct net_device *netdev)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct napi_struct *napi, *n;

        /* tell Octeon to stop forwarding packets to host */
        send_rx_ctrl_cmd(lio, 0);

        netif_info(lio, ifdown, lio->netdev, "Stopping interface!\n");
        /* Inform that netif carrier is down */
        lio->intf_open = 0;
        lio->linfo.link.s.link_up = 0;

        netif_carrier_off(netdev);
        lio->link_changes++;

        ifstate_reset(lio, LIO_IFSTATE_RUNNING);

        stop_txqs(netdev);

        /* Wait for any pending Rx descriptors */
        if (lio_wait_for_clean_oq(oct))
                netif_info(lio, rx_err, lio->netdev,
                           "Proceeding with stop interface after partial RX desc processing\n");

        if (oct->props[lio->ifidx].napi_enabled == 1) {
                list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list)
                        napi_disable(napi);

                oct->props[lio->ifidx].napi_enabled = 0;

                oct->droq[0]->ops.poll_mode = 0;
        }

        dev_info(&oct->pci_dev->dev, "%s interface is stopped\n", netdev->name);

        return 0;
}

/**
 * \brief Converts a mask based on net device flags
 * @param netdev network device
 *
 * This routine generates a octnet_ifflags mask from the net device flags
 * received from the OS.
 */
static enum octnet_ifflags get_new_flags(struct net_device *netdev)
{
        enum octnet_ifflags f = OCTNET_IFFLAG_UNICAST;

        if (netdev->flags & IFF_PROMISC)
                f |= OCTNET_IFFLAG_PROMISC;

        if (netdev->flags & IFF_ALLMULTI)
                f |= OCTNET_IFFLAG_ALLMULTI;

        if (netdev->flags & IFF_MULTICAST) {
                f |= OCTNET_IFFLAG_MULTICAST;

                /* Accept all multicast addresses if there are more than we
                 * can handle
                 */
                if (netdev_mc_count(netdev) > MAX_OCTEON_MULTICAST_ADDR)
                        f |= OCTNET_IFFLAG_ALLMULTI;
        }

        if (netdev->flags & IFF_BROADCAST)
                f |= OCTNET_IFFLAG_BROADCAST;

        return f;
}

static void liquidio_set_uc_list(struct net_device *netdev)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        struct netdev_hw_addr *ha;
        u64 *mac;

        if (lio->netdev_uc_count == netdev_uc_count(netdev))
                return;

        if (netdev_uc_count(netdev) > MAX_NCTRL_UDD) {
                dev_err(&oct->pci_dev->dev, "too many MAC addresses in netdev uc list\n");
                return;
        }

        lio->netdev_uc_count = netdev_uc_count(netdev);

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));
        nctrl.ncmd.s.cmd = OCTNET_CMD_SET_UC_LIST;
        nctrl.ncmd.s.more = lio->netdev_uc_count;
        nctrl.ncmd.s.param1 = oct->vf_num;
        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;

        /* copy all the addresses into the udd */
        mac = &nctrl.udd[0];
        netdev_for_each_uc_addr(ha, netdev) {
                ether_addr_copy(((u8 *)mac) + 2, ha->addr);
                mac++;
        }

        octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
}

/**
 * \brief Net device set_multicast_list
 * @param netdev network device
 */
static void liquidio_set_mcast_list(struct net_device *netdev)
{
        int mc_count = min(netdev_mc_count(netdev), MAX_OCTEON_MULTICAST_ADDR);
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        struct netdev_hw_addr *ha;
        u64 *mc;
        int ret;

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));

        /* Create a ctrl pkt command to be sent to core app. */
        nctrl.ncmd.u64 = 0;
        nctrl.ncmd.s.cmd = OCTNET_CMD_SET_MULTI_LIST;
        nctrl.ncmd.s.param1 = get_new_flags(netdev);
        nctrl.ncmd.s.param2 = mc_count;
        nctrl.ncmd.s.more = mc_count;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;

        /* copy all the addresses into the udd */
        mc = &nctrl.udd[0];
        netdev_for_each_mc_addr(ha, netdev) {
                *mc = 0;
                ether_addr_copy(((u8 *)mc) + 2, ha->addr);
                /* no need to swap bytes */
                if (++mc > &nctrl.udd[mc_count])
                        break;
        }

        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;

        /* Apparently, any activity in this call from the kernel has to
         * be atomic. So we won't wait for response.
         */
        nctrl.wait_time = 0;

        ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
        if (ret < 0) {
                dev_err(&oct->pci_dev->dev, "DEVFLAGS change failed in core (ret: 0x%x)\n",
                        ret);
        }

        liquidio_set_uc_list(netdev);
}

/**
 * \brief Net device set_mac_address
 * @param netdev network device
 */
static int liquidio_set_mac(struct net_device *netdev, void *p)
{
        struct sockaddr *addr = (struct sockaddr *)p;
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        int ret = 0;

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

        if (ether_addr_equal(addr->sa_data, netdev->dev_addr))
                return 0;

        if (lio->linfo.macaddr_is_admin_asgnd)
                return -EPERM;

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));

        nctrl.ncmd.u64 = 0;
        nctrl.ncmd.s.cmd = OCTNET_CMD_CHANGE_MACADDR;
        nctrl.ncmd.s.param1 = 0;
        nctrl.ncmd.s.more = 1;
        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;
        nctrl.wait_time = 100;

        nctrl.udd[0] = 0;
        /* The MAC Address is presented in network byte order. */
        ether_addr_copy((u8 *)&nctrl.udd[0] + 2, addr->sa_data);

        ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
        if (ret < 0) {
                dev_err(&oct->pci_dev->dev, "MAC Address change failed\n");
                return -ENOMEM;
        }
        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
        ether_addr_copy(((u8 *)&lio->linfo.hw_addr) + 2, addr->sa_data);

        return 0;
}

static void
liquidio_get_stats64(struct net_device *netdev,
                     struct rtnl_link_stats64 *lstats)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct;
        u64 pkts = 0, drop = 0, bytes = 0;
        struct oct_droq_stats *oq_stats;
        struct oct_iq_stats *iq_stats;
        int i, iq_no, oq_no;

        oct = lio->oct_dev;

        if (ifstate_check(lio, LIO_IFSTATE_RESETTING))
                return;

        for (i = 0; i < oct->num_iqs; i++) {
                iq_no = lio->linfo.txpciq[i].s.q_no;
                iq_stats = &oct->instr_queue[iq_no]->stats;
                pkts += iq_stats->tx_done;
                drop += iq_stats->tx_dropped;
                bytes += iq_stats->tx_tot_bytes;
        }

        lstats->tx_packets = pkts;
        lstats->tx_bytes = bytes;
        lstats->tx_dropped = drop;

        pkts = 0;
        drop = 0;
        bytes = 0;

        for (i = 0; i < oct->num_oqs; i++) {
                oq_no = lio->linfo.rxpciq[i].s.q_no;
                oq_stats = &oct->droq[oq_no]->stats;
                pkts += oq_stats->rx_pkts_received;
                drop += (oq_stats->rx_dropped +
                         oq_stats->dropped_nodispatch +
                         oq_stats->dropped_toomany +
                         oq_stats->dropped_nomem);
                bytes += oq_stats->rx_bytes_received;
        }

        lstats->rx_bytes = bytes;
        lstats->rx_packets = pkts;
        lstats->rx_dropped = drop;

        octnet_get_link_stats(netdev);
        lstats->multicast = oct->link_stats.fromwire.fw_total_mcast;

        /* detailed rx_errors: */
        lstats->rx_length_errors = oct->link_stats.fromwire.l2_err;
        /* recved pkt with crc error */
        lstats->rx_crc_errors = oct->link_stats.fromwire.fcs_err;
        /* recv'd frame alignment error */
        lstats->rx_frame_errors = oct->link_stats.fromwire.frame_err;

        lstats->rx_errors = lstats->rx_length_errors + lstats->rx_crc_errors +
                            lstats->rx_frame_errors;

        /* detailed tx_errors */
        lstats->tx_aborted_errors = oct->link_stats.fromhost.fw_err_pko;
        lstats->tx_carrier_errors = oct->link_stats.fromhost.fw_err_link;

        lstats->tx_errors = lstats->tx_aborted_errors +
                lstats->tx_carrier_errors;
}

/**
 * \brief Handler for SIOCSHWTSTAMP ioctl
 * @param netdev network device
 * @param ifr interface request
 * @param cmd command
 */
static int hwtstamp_ioctl(struct net_device *netdev, struct ifreq *ifr)
{
        struct lio *lio = GET_LIO(netdev);
        struct hwtstamp_config conf;

        if (copy_from_user(&conf, ifr->ifr_data, sizeof(conf)))
                return -EFAULT;

        if (conf.flags)
                return -EINVAL;

        switch (conf.tx_type) {
        case HWTSTAMP_TX_ON:
        case HWTSTAMP_TX_OFF:
                break;
        default:
                return -ERANGE;
        }

        switch (conf.rx_filter) {
        case HWTSTAMP_FILTER_NONE:
                break;
        case HWTSTAMP_FILTER_ALL:
        case HWTSTAMP_FILTER_SOME:
        case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
        case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
        case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
        case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
        case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
        case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
        case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
        case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
        case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
        case HWTSTAMP_FILTER_PTP_V2_EVENT:
        case HWTSTAMP_FILTER_PTP_V2_SYNC:
        case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
        case HWTSTAMP_FILTER_NTP_ALL:
                conf.rx_filter = HWTSTAMP_FILTER_ALL;
                break;
        default:
                return -ERANGE;
        }

        if (conf.rx_filter == HWTSTAMP_FILTER_ALL)
                ifstate_set(lio, LIO_IFSTATE_RX_TIMESTAMP_ENABLED);

        else
                ifstate_reset(lio, LIO_IFSTATE_RX_TIMESTAMP_ENABLED);

        return copy_to_user(ifr->ifr_data, &conf, sizeof(conf)) ? -EFAULT : 0;
}

/**
 * \brief ioctl handler
 * @param netdev network device
 * @param ifr interface request
 * @param cmd command
 */
static int liquidio_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        case SIOCSHWTSTAMP:
                return hwtstamp_ioctl(netdev, ifr);
        default:
                return -EOPNOTSUPP;
        }
}

static void handle_timestamp(struct octeon_device *oct, u32 status, void *buf)
{
        struct sk_buff *skb = (struct sk_buff *)buf;
        struct octnet_buf_free_info *finfo;
        struct oct_timestamp_resp *resp;
        struct octeon_soft_command *sc;
        struct lio *lio;

        finfo = (struct octnet_buf_free_info *)skb->cb;
        lio = finfo->lio;
        sc = finfo->sc;
        oct = lio->oct_dev;
        resp = (struct oct_timestamp_resp *)sc->virtrptr;

        if (status != OCTEON_REQUEST_DONE) {
                dev_err(&oct->pci_dev->dev, "Tx timestamp instruction failed. Status: %llx\n",
                        CVM_CAST64(status));
                resp->timestamp = 0;
        }

        octeon_swap_8B_data(&resp->timestamp, 1);

        if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS)) {
                struct skb_shared_hwtstamps ts;
                u64 ns = resp->timestamp;

                netif_info(lio, tx_done, lio->netdev,
                           "Got resulting SKBTX_HW_TSTAMP skb=%p ns=%016llu\n",
                           skb, (unsigned long long)ns);
                ts.hwtstamp = ns_to_ktime(ns + lio->ptp_adjust);
                skb_tstamp_tx(skb, &ts);
        }

        octeon_free_soft_command(oct, sc);
        tx_buffer_free(skb);
}

/* \brief Send a data packet that will be timestamped
 * @param oct octeon device
 * @param ndata pointer to network data
 * @param finfo pointer to private network data
 */
static int send_nic_timestamp_pkt(struct octeon_device *oct,
                                  struct octnic_data_pkt *ndata,
                                  struct octnet_buf_free_info *finfo,
                                  int xmit_more)
{
        struct octeon_soft_command *sc;
        int ring_doorbell;
        struct lio *lio;
        int retval;
        u32 len;

        lio = finfo->lio;

        sc = octeon_alloc_soft_command_resp(oct, &ndata->cmd,
                                            sizeof(struct oct_timestamp_resp));
        finfo->sc = sc;

        if (!sc) {
                dev_err(&oct->pci_dev->dev, "No memory for timestamped data packet\n");
                return IQ_SEND_FAILED;
        }

        if (ndata->reqtype == REQTYPE_NORESP_NET)
                ndata->reqtype = REQTYPE_RESP_NET;
        else if (ndata->reqtype == REQTYPE_NORESP_NET_SG)
                ndata->reqtype = REQTYPE_RESP_NET_SG;

        sc->callback = handle_timestamp;
        sc->callback_arg = finfo->skb;
        sc->iq_no = ndata->q_no;

        len = (u32)((struct octeon_instr_ih3 *)(&sc->cmd.cmd3.ih3))->dlengsz;

        ring_doorbell = !xmit_more;

        retval = octeon_send_command(oct, sc->iq_no, ring_doorbell, &sc->cmd,
                                     sc, len, ndata->reqtype);

        if (retval == IQ_SEND_FAILED) {
                dev_err(&oct->pci_dev->dev, "timestamp data packet failed status: %x\n",
                        retval);
                octeon_free_soft_command(oct, sc);
        } else {
                netif_info(lio, tx_queued, lio->netdev, "Queued timestamp packet\n");
        }

        return retval;
}

/** \brief Transmit networks packets to the Octeon interface
 * @param skbuff   skbuff struct to be passed to network layer.
 * @param netdev   pointer to network device
 * @returns whether the packet was transmitted to the device okay or not
 *             (NETDEV_TX_OK or NETDEV_TX_BUSY)
 */
static int liquidio_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct octnet_buf_free_info *finfo;
        union octnic_cmd_setup cmdsetup;
        struct octnic_data_pkt ndata;
        struct octeon_instr_irh *irh;
        struct oct_iq_stats *stats;
        struct octeon_device *oct;
        int q_idx = 0, iq_no = 0;
        union tx_info *tx_info;
        int xmit_more = 0;
        struct lio *lio;
        int status = 0;
        u64 dptr = 0;
        u32 tag = 0;
        int j;

        lio = GET_LIO(netdev);
        oct = lio->oct_dev;

        q_idx = skb_iq(lio->oct_dev, skb);
        tag = q_idx;
        iq_no = lio->linfo.txpciq[q_idx].s.q_no;

        stats = &oct->instr_queue[iq_no]->stats;

        /* Check for all conditions in which the current packet cannot be
         * transmitted.
         */
        if (!(atomic_read(&lio->ifstate) & LIO_IFSTATE_RUNNING) ||
            (!lio->linfo.link.s.link_up) || (skb->len <= 0)) {
                netif_info(lio, tx_err, lio->netdev, "Transmit failed link_status : %d\n",
                           lio->linfo.link.s.link_up);
                goto lio_xmit_failed;
        }

        /* Use space in skb->cb to store info used to unmap and
         * free the buffers.
         */
        finfo = (struct octnet_buf_free_info *)skb->cb;
        finfo->lio = lio;
        finfo->skb = skb;
        finfo->sc = NULL;

        /* Prepare the attributes for the data to be passed to OSI. */
        memset(&ndata, 0, sizeof(struct octnic_data_pkt));

        ndata.buf = finfo;

        ndata.q_no = iq_no;

        if (octnet_iq_is_full(oct, ndata.q_no)) {
                /* defer sending if queue is full */
                netif_info(lio, tx_err, lio->netdev, "Transmit failed iq:%d full\n",
                           ndata.q_no);
                stats->tx_iq_busy++;
                return NETDEV_TX_BUSY;
        }

        ndata.datasize = skb->len;

        cmdsetup.u64 = 0;
        cmdsetup.s.iq_no = iq_no;

        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                if (skb->encapsulation) {
                        cmdsetup.s.tnl_csum = 1;
                        stats->tx_vxlan++;
                } else {
                        cmdsetup.s.transport_csum = 1;
                }
        }
        if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
                skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
                cmdsetup.s.timestamp = 1;
        }

        if (!skb_shinfo(skb)->nr_frags) {
                cmdsetup.s.u.datasize = skb->len;
                octnet_prepare_pci_cmd(oct, &ndata.cmd, &cmdsetup, tag);
                /* Offload checksum calculation for TCP/UDP packets */
                dptr = dma_map_single(&oct->pci_dev->dev,
                                      skb->data,
                                      skb->len,
                                      DMA_TO_DEVICE);
                if (dma_mapping_error(&oct->pci_dev->dev, dptr)) {
                        dev_err(&oct->pci_dev->dev, "%s DMA mapping error 1\n",
                                __func__);
                        return NETDEV_TX_BUSY;
                }

                ndata.cmd.cmd3.dptr = dptr;
                finfo->dptr = dptr;
                ndata.reqtype = REQTYPE_NORESP_NET;

        } else {
                struct skb_frag_struct *frag;
                struct octnic_gather *g;
                int i, frags;

                spin_lock(&lio->glist_lock[q_idx]);
                g = (struct octnic_gather *)
                        lio_list_delete_head(&lio->glist[q_idx]);
                spin_unlock(&lio->glist_lock[q_idx]);

                if (!g) {
                        netif_info(lio, tx_err, lio->netdev,
                                   "Transmit scatter gather: glist null!\n");
                        goto lio_xmit_failed;
                }

                cmdsetup.s.gather = 1;
                cmdsetup.s.u.gatherptrs = (skb_shinfo(skb)->nr_frags + 1);
                octnet_prepare_pci_cmd(oct, &ndata.cmd, &cmdsetup, tag);

                memset(g->sg, 0, g->sg_size);

                g->sg[0].ptr[0] = dma_map_single(&oct->pci_dev->dev,
                                                 skb->data,
                                                 (skb->len - skb->data_len),
                                                 DMA_TO_DEVICE);
                if (dma_mapping_error(&oct->pci_dev->dev, g->sg[0].ptr[0])) {
                        dev_err(&oct->pci_dev->dev, "%s DMA mapping error 2\n",
                                __func__);
                        return NETDEV_TX_BUSY;
                }
                add_sg_size(&g->sg[0], (skb->len - skb->data_len), 0);

                frags = skb_shinfo(skb)->nr_frags;
                i = 1;
                while (frags--) {
                        frag = &skb_shinfo(skb)->frags[i - 1];

                        g->sg[(i >> 2)].ptr[(i & 3)] =
                                dma_map_page(&oct->pci_dev->dev,
                                             frag->page.p,
                                             frag->page_offset,
                                             frag->size,
                                             DMA_TO_DEVICE);
                        if (dma_mapping_error(&oct->pci_dev->dev,
                                              g->sg[i >> 2].ptr[i & 3])) {
                                dma_unmap_single(&oct->pci_dev->dev,
                                                 g->sg[0].ptr[0],
                                                 skb->len - skb->data_len,
                                                 DMA_TO_DEVICE);
                                for (j = 1; j < i; j++) {
                                        frag = &skb_shinfo(skb)->frags[j - 1];
                                        dma_unmap_page(&oct->pci_dev->dev,
                                                       g->sg[j >> 2].ptr[j & 3],
                                                       frag->size,
                                                       DMA_TO_DEVICE);
                                }
                                dev_err(&oct->pci_dev->dev, "%s DMA mapping error 3\n",
                                        __func__);
                                return NETDEV_TX_BUSY;
                        }

                        add_sg_size(&g->sg[(i >> 2)], frag->size, (i & 3));
                        i++;
                }

                dptr = g->sg_dma_ptr;

                ndata.cmd.cmd3.dptr = dptr;
                finfo->dptr = dptr;
                finfo->g = g;

                ndata.reqtype = REQTYPE_NORESP_NET_SG;
        }

        irh = (struct octeon_instr_irh *)&ndata.cmd.cmd3.irh;
        tx_info = (union tx_info *)&ndata.cmd.cmd3.ossp[0];

        if (skb_shinfo(skb)->gso_size) {
                tx_info->s.gso_size = skb_shinfo(skb)->gso_size;
                tx_info->s.gso_segs = skb_shinfo(skb)->gso_segs;
        }

        /* HW insert VLAN tag */
        if (skb_vlan_tag_present(skb)) {
                irh->priority = skb_vlan_tag_get(skb) >> VLAN_PRIO_SHIFT;
                irh->vlan = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
        }

        xmit_more = netdev_xmit_more();

        if (unlikely(cmdsetup.s.timestamp))
                status = send_nic_timestamp_pkt(oct, &ndata, finfo, xmit_more);
        else
                status = octnet_send_nic_data_pkt(oct, &ndata, xmit_more);
        if (status == IQ_SEND_FAILED)
                goto lio_xmit_failed;

        netif_info(lio, tx_queued, lio->netdev, "Transmit queued successfully\n");

        if (status == IQ_SEND_STOP) {
                dev_err(&oct->pci_dev->dev, "Rcvd IQ_SEND_STOP signal; stopping IQ-%d\n",
                        iq_no);
                netif_stop_subqueue(netdev, q_idx);
        }

        netif_trans_update(netdev);

        if (tx_info->s.gso_segs)
                stats->tx_done += tx_info->s.gso_segs;
        else
                stats->tx_done++;
        stats->tx_tot_bytes += ndata.datasize;

        return NETDEV_TX_OK;

lio_xmit_failed:
        stats->tx_dropped++;
        netif_info(lio, tx_err, lio->netdev, "IQ%d Transmit dropped:%llu\n",
                   iq_no, stats->tx_dropped);
        if (dptr)
                dma_unmap_single(&oct->pci_dev->dev, dptr,
                                 ndata.datasize, DMA_TO_DEVICE);

        octeon_ring_doorbell_locked(oct, iq_no);

        tx_buffer_free(skb);
        return NETDEV_TX_OK;
}

/** \brief Network device Tx timeout
 * @param netdev    pointer to network device
 */
static void liquidio_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
        struct lio *lio;

        lio = GET_LIO(netdev);

        netif_info(lio, tx_err, lio->netdev,
                   "Transmit timeout tx_dropped:%ld, waking up queues now!!\n",
                   netdev->stats.tx_dropped);
        netif_trans_update(netdev);
        wake_txqs(netdev);
}

static int
liquidio_vlan_rx_add_vid(struct net_device *netdev,
                         __be16 proto __attribute__((unused)), u16 vid)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        struct completion compl;
        u16 response_code;
        int ret = 0;

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));

        nctrl.ncmd.u64 = 0;
        nctrl.ncmd.s.cmd = OCTNET_CMD_ADD_VLAN_FILTER;
        nctrl.ncmd.s.param1 = vid;
        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
        nctrl.wait_time = 100;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;
        init_completion(&compl);
        nctrl.completion = &compl;
        nctrl.response_code = &response_code;

        ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
        if (ret < 0) {
                dev_err(&oct->pci_dev->dev, "Add VLAN filter failed in core (ret: 0x%x)\n",
                        ret);
                return -EIO;
        }

        if (!wait_for_completion_timeout(&compl,
                                         msecs_to_jiffies(nctrl.wait_time)))
                return -EPERM;

        if (READ_ONCE(response_code))
                return -EPERM;

        return 0;
}

static int
liquidio_vlan_rx_kill_vid(struct net_device *netdev,
                          __be16 proto __attribute__((unused)), u16 vid)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        int ret = 0;

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));

        nctrl.ncmd.u64 = 0;
        nctrl.ncmd.s.cmd = OCTNET_CMD_DEL_VLAN_FILTER;
        nctrl.ncmd.s.param1 = vid;
        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
        nctrl.wait_time = 100;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;

        ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
        if (ret < 0) {
                dev_err(&oct->pci_dev->dev, "Add VLAN filter failed in core (ret: 0x%x)\n",
                        ret);
        }
        return ret;
}

/** Sending command to enable/disable RX checksum offload
 * @param netdev                pointer to network device
 * @param command               OCTNET_CMD_TNL_RX_CSUM_CTL
 * @param rx_cmd_bit            OCTNET_CMD_RXCSUM_ENABLE/
 *                              OCTNET_CMD_RXCSUM_DISABLE
 * @returns                     SUCCESS or FAILURE
 */
static int liquidio_set_rxcsum_command(struct net_device *netdev, int command,
                                       u8 rx_cmd)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        int ret = 0;

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));

        nctrl.ncmd.u64 = 0;
        nctrl.ncmd.s.cmd = command;
        nctrl.ncmd.s.param1 = rx_cmd;
        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
        nctrl.wait_time = 100;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;

        ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
        if (ret < 0) {
                dev_err(&oct->pci_dev->dev, "DEVFLAGS RXCSUM change failed in core (ret:0x%x)\n",
                        ret);
        }
        return ret;
}

/** Sending command to add/delete VxLAN UDP port to firmware
 * @param netdev                pointer to network device
 * @param command               OCTNET_CMD_VXLAN_PORT_CONFIG
 * @param vxlan_port            VxLAN port to be added or deleted
 * @param vxlan_cmd_bit         OCTNET_CMD_VXLAN_PORT_ADD,
 *                              OCTNET_CMD_VXLAN_PORT_DEL
 * @returns                     SUCCESS or FAILURE
 */
static int liquidio_vxlan_port_command(struct net_device *netdev, int command,
                                       u16 vxlan_port, u8 vxlan_cmd_bit)
{
        struct lio *lio = GET_LIO(netdev);
        struct octeon_device *oct = lio->oct_dev;
        struct octnic_ctrl_pkt nctrl;
        int ret = 0;

        memset(&nctrl, 0, sizeof(struct octnic_ctrl_pkt));

        nctrl.ncmd.u64 = 0;
        nctrl.ncmd.s.cmd = command;
        nctrl.ncmd.s.more = vxlan_cmd_bit;
        nctrl.ncmd.s.param1 = vxlan_port;
        nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
        nctrl.wait_time = 100;
        nctrl.netpndev = (u64)netdev;
        nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;

        ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);
        if (ret < 0) {
                dev_err(&oct->pci_dev->dev,
                        "DEVFLAGS VxLAN port add/delete failed in core (ret : 0x%x)\n",
                        ret);
        }
        return ret;
}

/** \brief Net device fix features
 * @param netdev  pointer to network device
 * @param request features requested
 * @returns updated features list
 */
static netdev_features_t liquidio_fix_features(struct net_device *netdev,
                                               netdev_features_t request)
{
        struct lio *lio = netdev_priv(netdev);

        if ((request & NETIF_F_RXCSUM) &&
            !(lio->dev_capability & NETIF_F_RXCSUM))
                request &= ~NETIF_F_RXCSUM;

        if ((request & NETIF_F_HW_CSUM) &&
            !(lio->dev_capability & NETIF_F_HW_CSUM))
                request &= ~NETIF_F_HW_CSUM;

        if ((request & NETIF_F_TSO) && !(lio->dev_capability & NETIF_F_TSO))
                request &= ~NETIF_F_TSO;

        if ((request & NETIF_F_TSO6) && !(lio->dev_capability & NETIF_F_TSO6))
                request &= ~NETIF_F_TSO6;

        if ((request & NETIF_F_LRO) && !(lio->dev_capability & NETIF_F_LRO))
                request &= ~NETIF_F_LRO;

        /* Disable LRO if RXCSUM is off */
        if (!(request & NETIF_F_RXCSUM) && (netdev->features & NETIF_F_LRO) &&
            (lio->dev_capability & NETIF_F_LRO))
                request &= ~NETIF_F_LRO;

        return request;
}

/** \brief Net device set features
 * @param netdev  pointer to network device
 * @param features features to enable/disable
 */
static int liquidio_set_features(struct net_device *netdev,
                                 netdev_features_t features)
{
        struct lio *lio = netdev_priv(netdev);

        if (!((netdev->features ^ features) & NETIF_F_LRO))
                return 0;

        if ((features & NETIF_F_LRO) && (lio->dev_capability & NETIF_F_LRO))
                liquidio_set_feature(netdev, OCTNET_CMD_LRO_ENABLE,
                                     OCTNIC_LROIPV4 | OCTNIC_LROIPV6);
        else if (!(features & NETIF_F_LRO) &&
                 (lio->dev_capability & NETIF_F_LRO))
                liquidio_set_feature(netdev, OCTNET_CMD_LRO_DISABLE,
                                     OCTNIC_LROIPV4 | OCTNIC_LROIPV6);
        if (!(netdev->features & NETIF_F_RXCSUM) &&
            (lio->enc_dev_capability & NETIF_F_RXCSUM) &&
            (features & NETIF_F_RXCSUM))
                liquidio_set_rxcsum_command(netdev, OCTNET_CMD_TNL_RX_CSUM_CTL,
                                            OCTNET_CMD_RXCSUM_ENABLE);
        else if ((netdev->features & NETIF_F_RXCSUM) &&
                 (lio->enc_dev_capability & NETIF_F_RXCSUM) &&
                 !(features & NETIF_F_RXCSUM))
                liquidio_set_rxcsum_command(netdev, OCTNET_CMD_TNL_RX_CSUM_CTL,
                                            OCTNET_CMD_RXCSUM_DISABLE);

        return 0;
}

static void liquidio_add_vxlan_port(struct net_device *netdev,
                                    struct udp_tunnel_info *ti)
{
        if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
                return;

        liquidio_vxlan_port_command(netdev,
                                    OCTNET_CMD_VXLAN_PORT_CONFIG,
                                    htons(ti->port),
                                    OCTNET_CMD_VXLAN_PORT_ADD);
}

static void liquidio_del_vxlan_port(struct net_device *netdev,
                                    struct udp_tunnel_info *ti)
{
        if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
                return;

        liquidio_vxlan_port_command(netdev,
                                    OCTNET_CMD_VXLAN_PORT_CONFIG,
                                    htons(ti->port),
                                    OCTNET_CMD_VXLAN_PORT_DEL);
}

static const struct net_device_ops lionetdevops = {
        .ndo_open               = liquidio_open,
        .ndo_stop               = liquidio_stop,
        .ndo_start_xmit         = liquidio_xmit,
        .ndo_get_stats64        = liquidio_get_stats64,
        .ndo_set_mac_address    = liquidio_set_mac,
        .ndo_set_rx_mode        = liquidio_set_mcast_list,
        .ndo_tx_timeout         = liquidio_tx_timeout,
        .ndo_vlan_rx_add_vid    = liquidio_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = liquidio_vlan_rx_kill_vid,
        .ndo_change_mtu         = liquidio_change_mtu,
        .ndo_do_ioctl           = liquidio_ioctl,
        .ndo_fix_features       = liquidio_fix_features,
        .ndo_set_features       = liquidio_set_features,
        .ndo_udp_tunnel_add     = liquidio_add_vxlan_port,
        .ndo_udp_tunnel_del     = liquidio_del_vxlan_port,
};

static int lio_nic_info(struct octeon_recv_info *recv_info, void *buf)
{
        struct octeon_device *oct = (struct octeon_device *)buf;
        struct octeon_recv_pkt *recv_pkt = recv_info->recv_pkt;
        union oct_link_status *ls;
        int gmxport = 0;
        int i;

        if (recv_pkt->buffer_size[0] != (sizeof(*ls) + OCT_DROQ_INFO_SIZE)) {
                dev_err(&oct->pci_dev->dev, "Malformed NIC_INFO, len=%d, ifidx=%d\n",
                        recv_pkt->buffer_size[0],
                        recv_pkt->rh.r_nic_info.gmxport);
                goto nic_info_err;
        }

        gmxport = recv_pkt->rh.r_nic_info.gmxport;
        ls = (union oct_link_status *)(get_rbd(recv_pkt->buffer_ptr[0]) +
                OCT_DROQ_INFO_SIZE);

        octeon_swap_8B_data((u64 *)ls, (sizeof(union oct_link_status)) >> 3);

        for (i = 0; i < oct->ifcount; i++) {
                if (oct->props[i].gmxport == gmxport) {
                        update_link_status(oct->props[i].netdev, ls);
                        break;
                }
        }

nic_info_err:
        for (i = 0; i < recv_pkt->buffer_count; i++)
                recv_buffer_free(recv_pkt->buffer_ptr[i]);
        octeon_free_recv_info(recv_info);
        return 0;
}

/**
 * \brief Setup network interfaces
 * @param octeon_dev  octeon device
 *
 * Called during init time for each device. It assumes the NIC
 * is already up and running.  The link information for each
 * interface is passed in link_info.
 */
static int setup_nic_devices(struct octeon_device *octeon_dev)
{
        int retval, num_iqueues, num_oqueues;
        struct liquidio_if_cfg_context *ctx;
        u32 resp_size, ctx_size, data_size;
        struct liquidio_if_cfg_resp *resp;
        struct octeon_soft_command *sc;
        union oct_nic_if_cfg if_cfg;
        struct octdev_props *props;
        struct net_device *netdev;
        struct lio_version *vdata;
        struct lio *lio = NULL;
        u8 mac[ETH_ALEN], i, j;
        u32 ifidx_or_pfnum;

        ifidx_or_pfnum = octeon_dev->pf_num;

        /* This is to handle link status changes */
        octeon_register_dispatch_fn(octeon_dev, OPCODE_NIC, OPCODE_NIC_INFO,
                                    lio_nic_info, octeon_dev);

        /* REQTYPE_RESP_NET and REQTYPE_SOFT_COMMAND do not have free functions.
         * They are handled directly.
         */
        octeon_register_reqtype_free_fn(octeon_dev, REQTYPE_NORESP_NET,
                                        free_netbuf);

        octeon_register_reqtype_free_fn(octeon_dev, REQTYPE_NORESP_NET_SG,
                                        free_netsgbuf);

        octeon_register_reqtype_free_fn(octeon_dev, REQTYPE_RESP_NET_SG,
                                        free_netsgbuf_with_resp);

        for (i = 0; i < octeon_dev->ifcount; i++) {
                resp_size = sizeof(struct liquidio_if_cfg_resp);
                ctx_size = sizeof(struct liquidio_if_cfg_context);
                data_size = sizeof(struct lio_version);
                sc = (struct octeon_soft_command *)
                        octeon_alloc_soft_command(octeon_dev, data_size,
                                                  resp_size, ctx_size);
                resp = (struct liquidio_if_cfg_resp *)sc->virtrptr;
                ctx  = (struct liquidio_if_cfg_context *)sc->ctxptr;
                vdata = (struct lio_version *)sc->virtdptr;

                *((u64 *)vdata) = 0;
                vdata->major = cpu_to_be16(LIQUIDIO_BASE_MAJOR_VERSION);
                vdata->minor = cpu_to_be16(LIQUIDIO_BASE_MINOR_VERSION);
                vdata->micro = cpu_to_be16(LIQUIDIO_BASE_MICRO_VERSION);

                WRITE_ONCE(ctx->cond, 0);
                ctx->octeon_id = lio_get_device_id(octeon_dev);
                init_waitqueue_head(&ctx->wc);

                if_cfg.u64 = 0;

                if_cfg.s.num_iqueues = octeon_dev->sriov_info.rings_per_vf;
                if_cfg.s.num_oqueues = octeon_dev->sriov_info.rings_per_vf;
                if_cfg.s.base_queue = 0;

                sc->iq_no = 0;

                octeon_prepare_soft_command(octeon_dev, sc, OPCODE_NIC,
                                            OPCODE_NIC_IF_CFG, 0, if_cfg.u64,
                                            0);

                sc->callback = lio_if_cfg_callback;
                sc->callback_arg = sc;
                sc->wait_time = 5000;

                retval = octeon_send_soft_command(octeon_dev, sc);
                if (retval == IQ_SEND_FAILED) {
                        dev_err(&octeon_dev->pci_dev->dev,
                                "iq/oq config failed status: %x\n", retval);
                        /* Soft instr is freed by driver in case of failure. */

                        goto setup_nic_dev_fail;
                }

                /* Sleep on a wait queue till the cond flag indicates that the
                 * response arrived or timed-out.
                 */
                if (sleep_cond(&ctx->wc, &ctx->cond) == -EINTR) {
                        dev_err(&octeon_dev->pci_dev->dev, "Wait interrupted\n");
                        goto setup_nic_wait_intr;
                }

                retval = resp->status;
                if (retval) {
                        dev_err(&octeon_dev->pci_dev->dev, "iq/oq config failed\n");
                        goto setup_nic_dev_fail;
                }

                octeon_swap_8B_data((u64 *)(&resp->cfg_info),
                                    (sizeof(struct liquidio_if_cfg_info)) >> 3);

                num_iqueues = hweight64(resp->cfg_info.iqmask);
                num_oqueues = hweight64(resp->cfg_info.oqmask);

                if (!(num_iqueues) || !(num_oqueues)) {
                        dev_err(&octeon_dev->pci_dev->dev,
                                "Got bad iqueues (%016llx) or oqueues (%016llx) from firmware.\n",
                                resp->cfg_info.iqmask, resp->cfg_info.oqmask);
                        goto setup_nic_dev_fail;
                }
                dev_dbg(&octeon_dev->pci_dev->dev,
                        "interface %d, iqmask %016llx, oqmask %016llx, numiqueues %d, numoqueues %d\n",
                        i, resp->cfg_info.iqmask, resp->cfg_info.oqmask,
                        num_iqueues, num_oqueues);

                netdev = alloc_etherdev_mq(LIO_SIZE, num_iqueues);

                if (!netdev) {
                        dev_err(&octeon_dev->pci_dev->dev, "Device allocation failed\n");
                        goto setup_nic_dev_fail;
                }

                SET_NETDEV_DEV(netdev, &octeon_dev->pci_dev->dev);

                /* Associate the routines that will handle different
                 * netdev tasks.
                 */
                netdev->netdev_ops = &lionetdevops;

                lio = GET_LIO(netdev);

                memset(lio, 0, sizeof(struct lio));

                lio->ifidx = ifidx_or_pfnum;

                props = &octeon_dev->props[i];
                props->gmxport = resp->cfg_info.linfo.gmxport;
                props->netdev = netdev;

                lio->linfo.num_rxpciq = num_oqueues;
                lio->linfo.num_txpciq = num_iqueues;

                for (j = 0; j < num_oqueues; j++) {
                        lio->linfo.rxpciq[j].u64 =
                            resp->cfg_info.linfo.rxpciq[j].u64;
                }
                for (j = 0; j < num_iqueues; j++) {
                        lio->linfo.txpciq[j].u64 =
                            resp->cfg_info.linfo.txpciq[j].u64;
                }

                lio->linfo.hw_addr = resp->cfg_info.linfo.hw_addr;
                lio->linfo.gmxport = resp->cfg_info.linfo.gmxport;
                lio->linfo.link.u64 = resp->cfg_info.linfo.link.u64;
                lio->linfo.macaddr_is_admin_asgnd =
                        resp->cfg_info.linfo.macaddr_is_admin_asgnd;

                lio->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

                lio->dev_capability = NETIF_F_HIGHDMA
                                      | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM
                                      | NETIF_F_SG | NETIF_F_RXCSUM
                                      | NETIF_F_TSO | NETIF_F_TSO6
                                      | NETIF_F_GRO
                                      | NETIF_F_LRO;
                netif_set_gso_max_size(netdev, OCTNIC_GSO_MAX_SIZE);

                /* Copy of transmit encapsulation capabilities:
                 * TSO, TSO6, Checksums for this device
                 */
                lio->enc_dev_capability = NETIF_F_IP_CSUM
                                          | NETIF_F_IPV6_CSUM
                                          | NETIF_F_GSO_UDP_TUNNEL
                                          | NETIF_F_HW_CSUM | NETIF_F_SG
                                          | NETIF_F_RXCSUM
                                          | NETIF_F_TSO | NETIF_F_TSO6
                                          | NETIF_F_LRO;

                netdev->hw_enc_features =
                    (lio->enc_dev_capability & ~NETIF_F_LRO);
                netdev->vlan_features = lio->dev_capability;
                /* Add any unchangeable hw features */
                lio->dev_capability |= NETIF_F_HW_VLAN_CTAG_FILTER |
                                       NETIF_F_HW_VLAN_CTAG_RX |
                                       NETIF_F_HW_VLAN_CTAG_TX;

                netdev->features = (lio->dev_capability & ~NETIF_F_LRO);

                netdev->hw_features = lio->dev_capability;
                netdev->hw_features &= ~NETIF_F_HW_VLAN_CTAG_RX;

                /* MTU range: 68 - 16000 */
                netdev->min_mtu = LIO_MIN_MTU_SIZE;
                netdev->max_mtu = LIO_MAX_MTU_SIZE;

                /* Point to the  properties for octeon device to which this
                 * interface belongs.
                 */
                lio->oct_dev = octeon_dev;
                lio->octprops = props;
                lio->netdev = netdev;

                dev_dbg(&octeon_dev->pci_dev->dev,
                        "if%d gmx: %d hw_addr: 0x%llx\n", i,
                        lio->linfo.gmxport, CVM_CAST64(lio->linfo.hw_addr));

                /* 64-bit swap required on LE machines */
                octeon_swap_8B_data(&lio->linfo.hw_addr, 1);
                for (j = 0; j < ETH_ALEN; j++)
                        mac[j] = *((u8 *)(((u8 *)&lio->linfo.hw_addr) + 2 + j));

                /* Copy MAC Address to OS network device structure */
                ether_addr_copy(netdev->dev_addr, mac);

                if (liquidio_setup_io_queues(octeon_dev, i,
                                             lio->linfo.num_txpciq,
                                             lio->linfo.num_rxpciq)) {
                        dev_err(&octeon_dev->pci_dev->dev, "I/O queues creation failed\n");
                        goto setup_nic_dev_fail;
                }

                ifstate_set(lio, LIO_IFSTATE_DROQ_OPS);

                /* For VFs, enable Octeon device interrupts here,
                 * as this is contingent upon IO queue setup
                 */
                octeon_dev->fn_list.enable_interrupt(octeon_dev,
                                                     OCTEON_ALL_INTR);

                /* By default all interfaces on a single Octeon uses the same
                 * tx and rx queues
                 */
                lio->txq = lio->linfo.txpciq[0].s.q_no;
                lio->rxq = lio->linfo.rxpciq[0].s.q_no;

                lio->tx_qsize = octeon_get_tx_qsize(octeon_dev, lio->txq);
                lio->rx_qsize = octeon_get_rx_qsize(octeon_dev, lio->rxq);

                if (lio_setup_glists(octeon_dev, lio, num_iqueues)) {
                        dev_err(&octeon_dev->pci_dev->dev,
                                "Gather list allocation failed\n");
                        goto setup_nic_dev_fail;
                }

                /* Register ethtool support */
                liquidio_set_ethtool_ops(netdev);
                if (lio->oct_dev->chip_id == OCTEON_CN23XX_VF_VID)
                        octeon_dev->priv_flags = OCT_PRIV_FLAG_DEFAULT;
                else
                        octeon_dev->priv_flags = 0x0;

                if (netdev->features & NETIF_F_LRO)
                        liquidio_set_feature(netdev, OCTNET_CMD_LRO_ENABLE,
                                             OCTNIC_LROIPV4 | OCTNIC_LROIPV6);

                if (setup_link_status_change_wq(netdev))
                        goto setup_nic_dev_fail;

                if (setup_rx_oom_poll_fn(netdev))
                        goto setup_nic_dev_fail;

                /* Register the network device with the OS */
                if (register_netdev(netdev)) {
                        dev_err(&octeon_dev->pci_dev->dev, "Device registration failed\n");
                        goto setup_nic_dev_fail;
                }

                dev_dbg(&octeon_dev->pci_dev->dev,
                        "Setup NIC ifidx:%d mac:%02x%02x%02x%02x%02x%02x\n",
                        i, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
                netif_carrier_off(netdev);
                lio->link_changes++;

                ifstate_set(lio, LIO_IFSTATE_REGISTERED);

                /* Sending command to firmware to enable Rx checksum offload
                 * by default at the time of setup of Liquidio driver for
                 * this device
                 */
                liquidio_set_rxcsum_command(netdev, OCTNET_CMD_TNL_RX_CSUM_CTL,
                                            OCTNET_CMD_RXCSUM_ENABLE);
                liquidio_set_feature(netdev, OCTNET_CMD_TNL_TX_CSUM_CTL,
                                     OCTNET_CMD_TXCSUM_ENABLE);

                dev_dbg(&octeon_dev->pci_dev->dev,
                        "NIC ifidx:%d Setup successful\n", i);

                octeon_free_soft_command(octeon_dev, sc);

                octeon_dev->no_speed_setting = 1;
        }

        return 0;

setup_nic_dev_fail:

        octeon_free_soft_command(octeon_dev, sc);

setup_nic_wait_intr:

        while (i--) {
                dev_err(&octeon_dev->pci_dev->dev,
                        "NIC ifidx:%d Setup failed\n", i);
                liquidio_destroy_nic_device(octeon_dev, i);
        }
        return -ENODEV;
}

/**
 * \brief initialize the NIC
 * @param oct octeon device
 *
 * This initialization routine is called once the Octeon device application is
 * up and running
 */
static int liquidio_init_nic_module(struct octeon_device *oct)
{
        int num_nic_ports = 1;
        int i, retval = 0;

        dev_dbg(&oct->pci_dev->dev, "Initializing network interfaces\n");

        /* only default iq and oq were initialized
         * initialize the rest as well run port_config command for each port
         */
        oct->ifcount = num_nic_ports;
        memset(oct->props, 0,
               sizeof(struct octdev_props) * num_nic_ports);

        for (i = 0; i < MAX_OCTEON_LINKS; i++)
                oct->props[i].gmxport = -1;

        retval = setup_nic_devices(oct);
        if (retval) {
                dev_err(&oct->pci_dev->dev, "Setup NIC devices failed\n");
                goto octnet_init_failure;
        }

        dev_dbg(&oct->pci_dev->dev, "Network interfaces ready\n");

        return retval;

octnet_init_failure:

        oct->ifcount = 0;

        return retval;
}

/**
 * \brief Device initialization for each Octeon device that is probed
 * @param octeon_dev  octeon device
 */
static int octeon_device_init(struct octeon_device *oct)
{
        u32 rev_id;
        int j;

        atomic_set(&oct->status, OCT_DEV_BEGIN_STATE);

        /* Enable access to the octeon device and make its DMA capability
         * known to the OS.
         */
        if (octeon_pci_os_setup(oct))
                return 1;
        atomic_set(&oct->status, OCT_DEV_PCI_ENABLE_DONE);

        oct->chip_id = OCTEON_CN23XX_VF_VID;
        pci_read_config_dword(oct->pci_dev, 8, &rev_id);
        oct->rev_id = rev_id & 0xff;

        if (cn23xx_setup_octeon_vf_device(oct))
                return 1;

        atomic_set(&oct->status, OCT_DEV_PCI_MAP_DONE);

        oct->app_mode = CVM_DRV_NIC_APP;

        /* Initialize the dispatch mechanism used to push packets arriving on
         * Octeon Output queues.
         */
        if (octeon_init_dispatch_list(oct))
                return 1;

        atomic_set(&oct->status, OCT_DEV_DISPATCH_INIT_DONE);

        if (octeon_set_io_queues_off(oct)) {
                dev_err(&oct->pci_dev->dev, "setting io queues off failed\n");
                return 1;
        }

        if (oct->fn_list.setup_device_regs(oct)) {
                dev_err(&oct->pci_dev->dev, "device registers configuration failed\n");
                return 1;
        }

        /* Initialize soft command buffer pool */
        if (octeon_setup_sc_buffer_pool(oct)) {
                dev_err(&oct->pci_dev->dev, "sc buffer pool allocation failed\n");
                return 1;
        }
        atomic_set(&oct->status, OCT_DEV_SC_BUFF_POOL_INIT_DONE);

        /* Setup the data structures that manage this Octeon's Input queues. */
        if (octeon_setup_instr_queues(oct)) {
                dev_err(&oct->pci_dev->dev, "instruction queue initialization failed\n");
                return 1;
        }
        atomic_set(&oct->status, OCT_DEV_INSTR_QUEUE_INIT_DONE);

        /* Initialize lists to manage the requests of different types that
         * arrive from user & kernel applications for this octeon device.
         */
        if (octeon_setup_response_list(oct)) {
                dev_err(&oct->pci_dev->dev, "Response list allocation failed\n");
                return 1;
        }
        atomic_set(&oct->status, OCT_DEV_RESP_LIST_INIT_DONE);

        if (octeon_setup_output_queues(oct)) {
                dev_err(&oct->pci_dev->dev, "Output queue initialization failed\n");
                return 1;
        }
        atomic_set(&oct->status, OCT_DEV_DROQ_INIT_DONE);

        if (oct->fn_list.setup_mbox(oct)) {
                dev_err(&oct->pci_dev->dev, "Mailbox setup failed\n");
                return 1;
        }
        atomic_set(&oct->status, OCT_DEV_MBOX_SETUP_DONE);

        if (octeon_allocate_ioq_vector(oct, oct->sriov_info.rings_per_vf)) {
                dev_err(&oct->pci_dev->dev, "ioq vector allocation failed\n");
                return 1;
        }
        atomic_set(&oct->status, OCT_DEV_MSIX_ALLOC_VECTOR_DONE);

        dev_info(&oct->pci_dev->dev, "OCTEON_CN23XX VF Version: %s, %d ioqs\n",
                 LIQUIDIO_VERSION, oct->sriov_info.rings_per_vf);

        /* Setup the interrupt handler and record the INT SUM register address*/
        if (octeon_setup_interrupt(oct, oct->sriov_info.rings_per_vf))
                return 1;

        atomic_set(&oct->status, OCT_DEV_INTR_SET_DONE);

        /* ***************************************************************
         * The interrupts need to be enabled for the PF<-->VF handshake.
         * They are [re]-enabled after the PF<-->VF handshake so that the
         * correct OQ tick value is used (i.e. the value retrieved from
         * the PF as part of the handshake).
         */

        /* Enable Octeon device interrupts */
        oct->fn_list.enable_interrupt(oct, OCTEON_ALL_INTR);

        if (cn23xx_octeon_pfvf_handshake(oct))
                return 1;

        /* Here we [re]-enable the interrupts so that the correct OQ tick value
         * is used (i.e. the value that was retrieved during the handshake)
         */

        /* Enable Octeon device interrupts */
        oct->fn_list.enable_interrupt(oct, OCTEON_ALL_INTR);
        /* *************************************************************** */

        /* Enable the input and output queues for this Octeon device */
        if (oct->fn_list.enable_io_queues(oct)) {
                dev_err(&oct->pci_dev->dev, "enabling io queues failed\n");
                return 1;
        }

        atomic_set(&oct->status, OCT_DEV_IO_QUEUES_DONE);

        atomic_set(&oct->status, OCT_DEV_HOST_OK);

        /* Send Credit for Octeon Output queues. Credits are always sent after
         * the output queue is enabled.
         */
        for (j = 0; j < oct->num_oqs; j++)
                writel(oct->droq[j]->max_count, oct->droq[j]->pkts_credit_reg);

        /* Packets can start arriving on the output queues from this point. */

        atomic_set(&oct->status, OCT_DEV_CORE_OK);

        atomic_set(&oct->status, OCT_DEV_RUNNING);

        if (liquidio_init_nic_module(oct))
                return 1;

        return 0;
}

static int __init liquidio_vf_init(void)
{
        octeon_init_device_list(0);
        return pci_register_driver(&liquidio_vf_pci_driver);
}

static void __exit liquidio_vf_exit(void)
{
        pci_unregister_driver(&liquidio_vf_pci_driver);

        pr_info("LiquidIO_VF network module is now unloaded\n");
}

module_init(liquidio_vf_init);
module_exit(liquidio_vf_exit);