// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/slab.h>
#include "vnic_resource.h"
#include "vnic_devcmd.h"
#include "vnic_dev.h"
#include "vnic_stats.h"
#include "vnic_wq.h"

struct devcmd2_controller {
        struct vnic_wq_ctrl *wq_ctrl;
        struct vnic_dev_ring results_ring;
        struct vnic_wq wq;
        struct vnic_devcmd2 *cmd_ring;
        struct devcmd2_result *result;
        u16 next_result;
        u16 result_size;
        int color;
};

enum vnic_proxy_type {
        PROXY_NONE,
        PROXY_BY_BDF,
        PROXY_BY_INDEX,
};

struct vnic_res {
        void __iomem *vaddr;
        unsigned int count;
};

struct vnic_dev {
        void *priv;
        struct pci_dev *pdev;
        struct vnic_res res[RES_TYPE_MAX];
        enum vnic_dev_intr_mode intr_mode;
        struct vnic_devcmd __iomem *devcmd;
        struct vnic_devcmd_notify *notify;
        struct vnic_devcmd_notify notify_copy;
        dma_addr_t notify_pa;
        u32 *linkstatus;
        dma_addr_t linkstatus_pa;
        struct vnic_stats *stats;
        dma_addr_t stats_pa;
        struct vnic_devcmd_fw_info *fw_info;
        dma_addr_t fw_info_pa;
        enum vnic_proxy_type proxy;
        u32 proxy_index;
        u64 args[VNIC_DEVCMD_NARGS];
        struct devcmd2_controller *devcmd2;
        int (*devcmd_rtn)(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
                        int wait);
};

#define VNIC_MAX_RES_HDR_SIZE \
        (sizeof(struct vnic_resource_header) + \
        sizeof(struct vnic_resource) * RES_TYPE_MAX)
#define VNIC_RES_STRIDE 128

void *vnic_dev_priv(struct vnic_dev *vdev)
{
        return vdev->priv;
}

static int vnic_dev_discover_res(struct vnic_dev *vdev,
        struct vnic_dev_bar *bar)
{
        struct vnic_resource_header __iomem *rh;
        struct vnic_resource __iomem *r;
        u8 type;

        if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
                printk(KERN_ERR "vNIC BAR0 res hdr length error\n");
                return -EINVAL;
        }

        rh = bar->vaddr;
        if (!rh) {
                printk(KERN_ERR "vNIC BAR0 res hdr not mem-mapped\n");
                return -EINVAL;
        }

        if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
            ioread32(&rh->version) != VNIC_RES_VERSION) {
                printk(KERN_ERR "vNIC BAR0 res magic/version error "
                        "exp (%lx/%lx) curr (%x/%x)\n",
                        VNIC_RES_MAGIC, VNIC_RES_VERSION,
                        ioread32(&rh->magic), ioread32(&rh->version));
                return -EINVAL;
        }

        r = (struct vnic_resource __iomem *)(rh + 1);

        while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {

                u8 bar_num = ioread8(&r->bar);
                u32 bar_offset = ioread32(&r->bar_offset);
                u32 count = ioread32(&r->count);
                u32 len;

                r++;

                if (bar_num != 0)  /* only mapping in BAR0 resources */
                        continue;

                switch (type) {
                case RES_TYPE_WQ:
                case RES_TYPE_RQ:
                case RES_TYPE_CQ:
                case RES_TYPE_INTR_CTRL:
                        /* each count is stride bytes long */
                        len = count * VNIC_RES_STRIDE;
                        if (len + bar_offset > bar->len) {
                                printk(KERN_ERR "vNIC BAR0 resource %d "
                                        "out-of-bounds, offset 0x%x + "
                                        "size 0x%x > bar len 0x%lx\n",
                                        type, bar_offset,
                                        len,
                                        bar->len);
                                return -EINVAL;
                        }
                        break;
                case RES_TYPE_INTR_PBA_LEGACY:
                case RES_TYPE_DEVCMD2:
                case RES_TYPE_DEVCMD:
                        len = count;
                        break;
                default:
                        continue;
                }

                vdev->res[type].count = count;
                vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
        }

        pr_info("res_type_wq: %d res_type_rq: %d res_type_cq: %d res_type_intr_ctrl: %d\n",
                vdev->res[RES_TYPE_WQ].count, vdev->res[RES_TYPE_RQ].count,
                vdev->res[RES_TYPE_CQ].count, vdev->res[RES_TYPE_INTR_CTRL].count);

        return 0;
}

unsigned int vnic_dev_get_res_count(struct vnic_dev *vdev,
        enum vnic_res_type type)
{
        return vdev->res[type].count;
}

void __iomem *vnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
        unsigned int index)
{
        if (!vdev->res[type].vaddr)
                return NULL;

        switch (type) {
        case RES_TYPE_WQ:
        case RES_TYPE_RQ:
        case RES_TYPE_CQ:
        case RES_TYPE_INTR_CTRL:
                return (char __iomem *)vdev->res[type].vaddr +
                                        index * VNIC_RES_STRIDE;
        default:
                return (char __iomem *)vdev->res[type].vaddr;
        }
}

unsigned int vnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
                                     unsigned int desc_count,
                                     unsigned int desc_size)
{
        /* The base address of the desc rings must be 512 byte aligned.
         * Descriptor count is aligned to groups of 32 descriptors.  A
         * count of 0 means the maximum 4096 descriptors.  Descriptor
         * size is aligned to 16 bytes.
         */

        unsigned int count_align = 32;
        unsigned int desc_align = 16;

        ring->base_align = 512;

        if (desc_count == 0)
                desc_count = 4096;

        ring->desc_count = ALIGN(desc_count, count_align);

        ring->desc_size = ALIGN(desc_size, desc_align);

        ring->size = ring->desc_count * ring->desc_size;
        ring->size_unaligned = ring->size + ring->base_align;

        return ring->size_unaligned;
}

void vnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
{
        memset(ring->descs, 0, ring->size);
}

int vnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
        unsigned int desc_count, unsigned int desc_size)
{
        vnic_dev_desc_ring_size(ring, desc_count, desc_size);

        ring->descs_unaligned = dma_alloc_coherent(&vdev->pdev->dev,
                ring->size_unaligned,
                &ring->base_addr_unaligned, GFP_KERNEL);

        if (!ring->descs_unaligned) {
                printk(KERN_ERR
                  "Failed to allocate ring (size=%d), aborting\n",
                        (int)ring->size);
                return -ENOMEM;
        }

        ring->base_addr = ALIGN(ring->base_addr_unaligned,
                ring->base_align);
        ring->descs = (u8 *)ring->descs_unaligned +
                (ring->base_addr - ring->base_addr_unaligned);

        vnic_dev_clear_desc_ring(ring);

        ring->desc_avail = ring->desc_count - 1;

        return 0;
}

void vnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
{
        if (ring->descs) {
                dma_free_coherent(&vdev->pdev->dev,
                        ring->size_unaligned,
                        ring->descs_unaligned,
                        ring->base_addr_unaligned);
                ring->descs = NULL;
        }
}

static int vnic_dev_cmd1(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd, int wait)
{
        struct vnic_devcmd __iomem *devcmd = vdev->devcmd;
        int delay;
        u32 status;
        static const int dev_cmd_err[] = {
                /* convert from fw's version of error.h to host's version */
                0,      /* ERR_SUCCESS */
                EINVAL, /* ERR_EINVAL */
                EFAULT, /* ERR_EFAULT */
                EPERM,  /* ERR_EPERM */
                EBUSY,  /* ERR_EBUSY */
        };
        int err;
        u64 *a0 = &vdev->args[0];
        u64 *a1 = &vdev->args[1];

        status = ioread32(&devcmd->status);
        if (status & STAT_BUSY) {
                printk(KERN_ERR "Busy devcmd %d\n", _CMD_N(cmd));
                return -EBUSY;
        }

        if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
                writeq(*a0, &devcmd->args[0]);
                writeq(*a1, &devcmd->args[1]);
                wmb();
        }

        iowrite32(cmd, &devcmd->cmd);

        if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
                        return 0;

        for (delay = 0; delay < wait; delay++) {

                udelay(100);

                status = ioread32(&devcmd->status);
                if (!(status & STAT_BUSY)) {

                        if (status & STAT_ERROR) {
                                err = dev_cmd_err[(int)readq(&devcmd->args[0])];
                                printk(KERN_ERR "Error %d devcmd %d\n",
                                        err, _CMD_N(cmd));
                                return -err;
                        }

                        if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
                                rmb();
                                *a0 = readq(&devcmd->args[0]);
                                *a1 = readq(&devcmd->args[1]);
                        }

                        return 0;
                }
        }

        printk(KERN_ERR "Timedout devcmd %d\n", _CMD_N(cmd));
        return -ETIMEDOUT;
}

static int vnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
                int wait)
{
        struct devcmd2_controller *dc2c = vdev->devcmd2;
        struct devcmd2_result *result;
        u8 color;
        unsigned int i;
        int delay;
        int err;
        u32 fetch_index;
        u32 posted;
        u32 new_posted;

        posted = ioread32(&dc2c->wq_ctrl->posted_index);
        fetch_index = ioread32(&dc2c->wq_ctrl->fetch_index);

        if (posted == 0xFFFFFFFF || fetch_index == 0xFFFFFFFF) {
                /* Hardware surprise removal: return error */
                pr_err("%s: devcmd2 invalid posted or fetch index on cmd %d\n",
                                pci_name(vdev->pdev), _CMD_N(cmd));
                pr_err("%s: fetch index: %u, posted index: %u\n",
                                pci_name(vdev->pdev), fetch_index, posted);

                return -ENODEV;

        }

        new_posted = (posted + 1) % DEVCMD2_RING_SIZE;

        if (new_posted == fetch_index) {
                pr_err("%s: devcmd2 wq full while issuing cmd %d\n",
                                pci_name(vdev->pdev), _CMD_N(cmd));
                pr_err("%s: fetch index: %u, posted index: %u\n",
                                pci_name(vdev->pdev), fetch_index, posted);
                return -EBUSY;

        }
        dc2c->cmd_ring[posted].cmd = cmd;
        dc2c->cmd_ring[posted].flags = 0;

        if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
                dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;
        if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
                for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
                        dc2c->cmd_ring[posted].args[i] = vdev->args[i];

        }

        /* Adding write memory barrier prevents compiler and/or CPU
         * reordering, thus avoiding descriptor posting before
         * descriptor is initialized. Otherwise, hardware can read
         * stale descriptor fields.
         */
        wmb();
        iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);

        if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
                return 0;

        result = dc2c->result + dc2c->next_result;
        color = dc2c->color;

        dc2c->next_result++;
        if (dc2c->next_result == dc2c->result_size) {
                dc2c->next_result = 0;
                dc2c->color = dc2c->color ? 0 : 1;
        }

        for (delay = 0; delay < wait; delay++) {
                udelay(100);
                if (result->color == color) {
                        if (result->error) {
                                err = -(int) result->error;
                                if (err != ERR_ECMDUNKNOWN ||
                                                cmd != CMD_CAPABILITY)
                                        pr_err("%s:Error %d devcmd %d\n",
                                                pci_name(vdev->pdev),
                                                err, _CMD_N(cmd));
                                return err;
                        }
                        if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
                                rmb(); /*prevent reorder while reding result*/
                                for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
                                        vdev->args[i] = result->results[i];
                        }
                        return 0;
                }
        }

        pr_err("%s:Timed out devcmd %d\n", pci_name(vdev->pdev), _CMD_N(cmd));

        return -ETIMEDOUT;
}


static int vnic_dev_init_devcmd1(struct vnic_dev *vdev)
{
        vdev->devcmd = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD, 0);
        if (!vdev->devcmd)
                return -ENODEV;

        vdev->devcmd_rtn = &vnic_dev_cmd1;
        return 0;
}


static int vnic_dev_init_devcmd2(struct vnic_dev *vdev)
{
        int err;
        unsigned int fetch_index;

        if (vdev->devcmd2)
                return 0;

        vdev->devcmd2 = kzalloc_obj(*vdev->devcmd2, GFP_ATOMIC);
        if (!vdev->devcmd2)
                return -ENOMEM;

        vdev->devcmd2->color = 1;
        vdev->devcmd2->result_size = DEVCMD2_RING_SIZE;
        err = vnic_wq_devcmd2_alloc(vdev, &vdev->devcmd2->wq,
                                DEVCMD2_RING_SIZE, DEVCMD2_DESC_SIZE);
        if (err)
                goto err_free_devcmd2;

        fetch_index = ioread32(&vdev->devcmd2->wq.ctrl->fetch_index);
        if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone  */
                pr_err("error in devcmd2 init");
                err = -ENODEV;
                goto err_free_wq;
        }

        /*
         * Don't change fetch_index ever and
         * set posted_index same as fetch_index
         * when setting up the WQ for devcmd2.
         */
        vnic_wq_init_start(&vdev->devcmd2->wq, 0, fetch_index,
                        fetch_index, 0, 0);

        vnic_wq_enable(&vdev->devcmd2->wq);

        err = vnic_dev_alloc_desc_ring(vdev, &vdev->devcmd2->results_ring,
                        DEVCMD2_RING_SIZE, DEVCMD2_DESC_SIZE);
        if (err)
                goto err_disable_wq;

        vdev->devcmd2->result =
                (struct devcmd2_result *) vdev->devcmd2->results_ring.descs;
        vdev->devcmd2->cmd_ring =
                (struct vnic_devcmd2 *) vdev->devcmd2->wq.ring.descs;
        vdev->devcmd2->wq_ctrl = vdev->devcmd2->wq.ctrl;
        vdev->args[0] = (u64) vdev->devcmd2->results_ring.base_addr |
                                VNIC_PADDR_TARGET;
        vdev->args[1] = DEVCMD2_RING_SIZE;

        err = vnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, 1000);
        if (err)
                goto err_free_desc_ring;

        vdev->devcmd_rtn = &vnic_dev_cmd2;

        return 0;

err_free_desc_ring:
        vnic_dev_free_desc_ring(vdev, &vdev->devcmd2->results_ring);
err_disable_wq:
        vnic_wq_disable(&vdev->devcmd2->wq);
err_free_wq:
        vnic_wq_free(&vdev->devcmd2->wq);
err_free_devcmd2:
        kfree(vdev->devcmd2);
        vdev->devcmd2 = NULL;

        return err;
}


static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
{
        vnic_dev_free_desc_ring(vdev, &vdev->devcmd2->results_ring);
        vnic_wq_disable(&vdev->devcmd2->wq);
        vnic_wq_free(&vdev->devcmd2->wq);
        kfree(vdev->devcmd2);
        vdev->devcmd2 = NULL;
        vdev->devcmd_rtn = &vnic_dev_cmd1;
}


static int vnic_dev_cmd_no_proxy(struct vnic_dev *vdev,
        enum vnic_devcmd_cmd cmd, u64 *a0, u64 *a1, int wait)
{
        int err;

        vdev->args[0] = *a0;
        vdev->args[1] = *a1;

        err = (*vdev->devcmd_rtn)(vdev, cmd, wait);

        *a0 = vdev->args[0];
        *a1 = vdev->args[1];

        return err;
}


int vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
        u64 *a0, u64 *a1, int wait)
{
        memset(vdev->args, 0, sizeof(vdev->args));

        switch (vdev->proxy) {
        case PROXY_NONE:
        default:
                return vnic_dev_cmd_no_proxy(vdev, cmd, a0, a1, wait);
        }
}


int vnic_dev_fw_info(struct vnic_dev *vdev,
        struct vnic_devcmd_fw_info **fw_info)
{
        u64 a0, a1 = 0;
        int wait = 1000;
        int err = 0;

        if (!vdev->fw_info) {
                vdev->fw_info = dma_alloc_coherent(&vdev->pdev->dev,
                        sizeof(struct vnic_devcmd_fw_info),
                        &vdev->fw_info_pa, GFP_KERNEL);
                if (!vdev->fw_info)
                        return -ENOMEM;

                a0 = vdev->fw_info_pa;

                /* only get fw_info once and cache it */
                err = vnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
        }

        *fw_info = vdev->fw_info;

        return err;
}

int vnic_dev_spec(struct vnic_dev *vdev, unsigned int offset, unsigned int size,
        void *value)
{
        u64 a0, a1;
        int wait = 1000;
        int err;

        a0 = offset;
        a1 = size;

        err = vnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);

        switch (size) {
        case 1:
                *(u8 *)value = (u8)a0;
                break;
        case 2:
                *(u16 *)value = (u16)a0;
                break;
        case 4:
                *(u32 *)value = (u32)a0;
                break;
        case 8:
                *(u64 *)value = a0;
                break;
        default:
                BUG();
                break;
        }

        return err;
}

int vnic_dev_stats_clear(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
}

int vnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
{
        u64 a0, a1;
        int wait = 1000;

        if (!vdev->stats) {
                vdev->stats = dma_alloc_coherent(&vdev->pdev->dev,
                        sizeof(struct vnic_stats), &vdev->stats_pa, GFP_KERNEL);
                if (!vdev->stats)
                        return -ENOMEM;
        }

        *stats = vdev->stats;
        a0 = vdev->stats_pa;
        a1 = sizeof(struct vnic_stats);

        return vnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
}

int vnic_dev_close(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
}

int vnic_dev_enable(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
}

int vnic_dev_disable(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
}

int vnic_dev_open(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
}

int vnic_dev_open_done(struct vnic_dev *vdev, int *done)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;

        *done = 0;

        err = vnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
        if (err)
                return err;

        *done = (a0 == 0);

        return 0;
}

int vnic_dev_soft_reset(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_SOFT_RESET, &a0, &a1, wait);
}

int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;

        *done = 0;

        err = vnic_dev_cmd(vdev, CMD_SOFT_RESET_STATUS, &a0, &a1, wait);
        if (err)
                return err;

        *done = (a0 == 0);

        return 0;
}

int vnic_dev_hang_notify(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_HANG_NOTIFY, &a0, &a1, wait);
}

int vnic_dev_mac_addr(struct vnic_dev *vdev, u8 *mac_addr)
{
        u64 a[2] = {};
        int wait = 1000;
        int err, i;

        for (i = 0; i < ETH_ALEN; i++)
                mac_addr[i] = 0;

        err = vnic_dev_cmd(vdev, CMD_MAC_ADDR, &a[0], &a[1], wait);
        if (err)
                return err;

        for (i = 0; i < ETH_ALEN; i++)
                mac_addr[i] = ((u8 *)&a)[i];

        return 0;
}

void vnic_dev_packet_filter(struct vnic_dev *vdev, int directed, int multicast,
        int broadcast, int promisc, int allmulti)
{
        u64 a0, a1 = 0;
        int wait = 1000;
        int err;

        a0 = (directed ? CMD_PFILTER_DIRECTED : 0) |
             (multicast ? CMD_PFILTER_MULTICAST : 0) |
             (broadcast ? CMD_PFILTER_BROADCAST : 0) |
             (promisc ? CMD_PFILTER_PROMISCUOUS : 0) |
             (allmulti ? CMD_PFILTER_ALL_MULTICAST : 0);

        err = vnic_dev_cmd(vdev, CMD_PACKET_FILTER, &a0, &a1, wait);
        if (err)
                printk(KERN_ERR "Can't set packet filter\n");
}

void vnic_dev_add_addr(struct vnic_dev *vdev, u8 *addr)
{
        u64 a[2] = {};
        int wait = 1000;
        int err;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a)[i] = addr[i];

        err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a[0], &a[1], wait);
        if (err)
                pr_err("Can't add addr [%pM], %d\n", addr, err);
}

void vnic_dev_del_addr(struct vnic_dev *vdev, u8 *addr)
{
        u64 a[2] = {};
        int wait = 1000;
        int err;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a)[i] = addr[i];

        err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a[0], &a[1], wait);
        if (err)
                pr_err("Can't del addr [%pM], %d\n", addr, err);
}

int vnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
{
        u64 a0, a1;
        int wait = 1000;

        if (!vdev->notify) {
                vdev->notify = dma_alloc_coherent(&vdev->pdev->dev,
                        sizeof(struct vnic_devcmd_notify),
                        &vdev->notify_pa, GFP_KERNEL);
                if (!vdev->notify)
                        return -ENOMEM;
        }

        a0 = vdev->notify_pa;
        a1 = ((u64)intr << 32) & 0x0000ffff00000000ULL;
        a1 += sizeof(struct vnic_devcmd_notify);

        return vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
}

void vnic_dev_notify_unset(struct vnic_dev *vdev)
{
        u64 a0, a1;
        int wait = 1000;

        a0 = 0;  /* paddr = 0 to unset notify buffer */
        a1 = 0x0000ffff00000000ULL; /* intr num = -1 to unreg for intr */
        a1 += sizeof(struct vnic_devcmd_notify);

        vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
}

static int vnic_dev_notify_ready(struct vnic_dev *vdev)
{
        u32 *words;
        unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
        unsigned int i;
        u32 csum;

        if (!vdev->notify)
                return 0;

        do {
                csum = 0;
                memcpy(&vdev->notify_copy, vdev->notify,
                        sizeof(struct vnic_devcmd_notify));
                words = (u32 *)&vdev->notify_copy;
                for (i = 1; i < nwords; i++)
                        csum += words[i];
        } while (csum != words[0]);

        return 1;
}

int vnic_dev_init(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        return vnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
}

u16 vnic_dev_set_default_vlan(struct vnic_dev *vdev, u16 new_default_vlan)
{
        u64 a0 = new_default_vlan, a1 = 0;
        int wait = 1000;
        int old_vlan = 0;

        old_vlan = vnic_dev_cmd(vdev, CMD_SET_DEFAULT_VLAN, &a0, &a1, wait);
        return (u16)old_vlan;
}

int vnic_dev_link_status(struct vnic_dev *vdev)
{
        if (vdev->linkstatus)
                return *vdev->linkstatus;

        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.link_state;
}

u32 vnic_dev_port_speed(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.port_speed;
}

u32 vnic_dev_msg_lvl(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.msglvl;
}

u32 vnic_dev_mtu(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.mtu;
}

u32 vnic_dev_link_down_cnt(struct vnic_dev *vdev)
{
        if (!vnic_dev_notify_ready(vdev))
                return 0;

        return vdev->notify_copy.link_down_cnt;
}

void vnic_dev_set_intr_mode(struct vnic_dev *vdev,
        enum vnic_dev_intr_mode intr_mode)
{
        vdev->intr_mode = intr_mode;
}

enum vnic_dev_intr_mode vnic_dev_get_intr_mode(
        struct vnic_dev *vdev)
{
        return vdev->intr_mode;
}

void vnic_dev_unregister(struct vnic_dev *vdev)
{
        if (vdev) {
                if (vdev->notify)
                        dma_free_coherent(&vdev->pdev->dev,
                                sizeof(struct vnic_devcmd_notify),
                                vdev->notify,
                                vdev->notify_pa);
                if (vdev->linkstatus)
                        dma_free_coherent(&vdev->pdev->dev,
                                sizeof(u32),
                                vdev->linkstatus,
                                vdev->linkstatus_pa);
                if (vdev->stats)
                        dma_free_coherent(&vdev->pdev->dev,
                                sizeof(struct vnic_stats),
                                vdev->stats, vdev->stats_pa);
                if (vdev->fw_info)
                        dma_free_coherent(&vdev->pdev->dev,
                                sizeof(struct vnic_devcmd_fw_info),
                                vdev->fw_info, vdev->fw_info_pa);
                if (vdev->devcmd2)
                        vnic_dev_deinit_devcmd2(vdev);
                kfree(vdev);
        }
}

struct vnic_dev *vnic_dev_register(struct vnic_dev *vdev,
        void *priv, struct pci_dev *pdev, struct vnic_dev_bar *bar)
{
        if (!vdev) {
                vdev = kzalloc_obj(struct vnic_dev);
                if (!vdev)
                        return NULL;
        }

        vdev->priv = priv;
        vdev->pdev = pdev;

        if (vnic_dev_discover_res(vdev, bar))
                goto err_out;

        return vdev;

err_out:
        vnic_dev_unregister(vdev);
        return NULL;
}

int vnic_dev_cmd_init(struct vnic_dev *vdev)
{
        int err;
        void *p;

        p = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
        if (p) {
                pr_err("fnic: DEVCMD2 resource found!\n");
                err = vnic_dev_init_devcmd2(vdev);
        } else {
                pr_err("fnic: DEVCMD2 not found, fall back to Devcmd\n");
                err = vnic_dev_init_devcmd1(vdev);
        }

        return err;
}