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

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/if_ether.h>

#include "vnic_resource.h"
#include "vnic_devcmd.h"
#include "vnic_dev.h"
#include "vnic_stats.h"

enum vnic_proxy_type {
        PROXY_NONE,
        PROXY_BY_BDF,
        PROXY_BY_INDEX,
};

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

struct vnic_intr_coal_timer_info {
        u32 mul;
        u32 div;
        u32 max_usec;
};

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 notify_sz;
        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 vnic_intr_coal_timer_info intr_coal_timer_info;
};

#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, unsigned int num_bars)
{
        struct vnic_resource_header __iomem *rh;
        struct mgmt_barmap_hdr __iomem *mrh;
        struct vnic_resource __iomem *r;
        u8 type;

        if (num_bars == 0)
                return -EINVAL;

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

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

        /* Check for mgmt vnic in addition to normal vnic */
        if ((ioread32(&rh->magic) != VNIC_RES_MAGIC) ||
                (ioread32(&rh->version) != VNIC_RES_VERSION)) {
                if ((ioread32(&mrh->magic) != MGMTVNIC_MAGIC) ||
                        (ioread32(&mrh->version) != MGMTVNIC_VERSION)) {
                        pr_err("vNIC BAR0 res magic/version error "
                        "exp (%lx/%lx) or (%lx/%lx), curr (%x/%x)\n",
                        VNIC_RES_MAGIC, VNIC_RES_VERSION,
                        MGMTVNIC_MAGIC, MGMTVNIC_VERSION,
                        ioread32(&rh->magic), ioread32(&rh->version));
                        return -EINVAL;
                }
        }

        if (ioread32(&mrh->magic) == MGMTVNIC_MAGIC)
                r = (struct vnic_resource __iomem *)(mrh + 1);
        else
                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 >= num_bars)
                        continue;

                if (!bar[bar_num].len || !bar[bar_num].vaddr)
                        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[bar_num].len) {
                                pr_err("vNIC BAR0 resource %d "
                                        "out-of-bounds, offset 0x%x + "
                                        "size 0x%x > bar len 0x%lx\n",
                                        type, bar_offset,
                                        len,
                                        bar[bar_num].len);
                                return -EINVAL;
                        }
                        break;
                case RES_TYPE_INTR_PBA_LEGACY:
                case RES_TYPE_DEVCMD:
                        len = count;
                        break;
                default:
                        continue;
                }

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

        return 0;
}

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

static 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 = pci_alloc_consistent(vdev->pdev,
                ring->size_unaligned,
                &ring->base_addr_unaligned);

        if (!ring->descs_unaligned) {
                pr_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) {
                pci_free_consistent(vdev->pdev,
                        ring->size_unaligned,
                        ring->descs_unaligned,
                        ring->base_addr_unaligned);
                ring->descs = NULL;
        }
}

static int _vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
        int wait)
{
        struct vnic_devcmd __iomem *devcmd = vdev->devcmd;
        unsigned int i;
        int delay;
        u32 status;
        int err;

        status = ioread32(&devcmd->status);
        if (status == 0xFFFFFFFF) {
                /* PCI-e target device is gone */
                return -ENODEV;
        }
        if (status & STAT_BUSY) {
                pr_err("Busy devcmd %d\n", _CMD_N(cmd));
                return -EBUSY;
        }

        if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
                for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
                        writeq(vdev->args[i], &devcmd->args[i]);
                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 == 0xFFFFFFFF) {
                        /* PCI-e target device is gone */
                        return -ENODEV;
                }

                if (!(status & STAT_BUSY)) {

                        if (status & STAT_ERROR) {
                                err = (int)readq(&devcmd->args[0]);
                                if (err == ERR_EINVAL &&
                                    cmd == CMD_CAPABILITY)
                                        return -err;
                                if (err != ERR_ECMDUNKNOWN ||
                                    cmd != CMD_CAPABILITY)
                                        pr_err("Error %d devcmd %d\n",
                                                err, _CMD_N(cmd));
                                return -err;
                        }

                        if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
                                rmb();
                                for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
                                        vdev->args[i] = readq(&devcmd->args[i]);
                        }

                        return 0;
                }
        }

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

static int vnic_dev_cmd_proxy(struct vnic_dev *vdev,
        enum vnic_devcmd_cmd proxy_cmd, enum vnic_devcmd_cmd cmd,
        u64 *a0, u64 *a1, int wait)
{
        u32 status;
        int err;

        memset(vdev->args, 0, sizeof(vdev->args));

        vdev->args[0] = vdev->proxy_index;
        vdev->args[1] = cmd;
        vdev->args[2] = *a0;
        vdev->args[3] = *a1;

        err = _vnic_dev_cmd(vdev, proxy_cmd, wait);
        if (err)
                return err;

        status = (u32)vdev->args[0];
        if (status & STAT_ERROR) {
                err = (int)vdev->args[1];
                if (err != ERR_ECMDUNKNOWN ||
                    cmd != CMD_CAPABILITY)
                        pr_err("Error %d proxy devcmd %d\n", err, _CMD_N(cmd));
                return err;
        }

        *a0 = vdev->args[1];
        *a1 = vdev->args[2];

        return 0;
}

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 = _vnic_dev_cmd(vdev, cmd, wait);

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

        return err;
}

void vnic_dev_cmd_proxy_by_index_start(struct vnic_dev *vdev, u16 index)
{
        vdev->proxy = PROXY_BY_INDEX;
        vdev->proxy_index = index;
}

void vnic_dev_cmd_proxy_end(struct vnic_dev *vdev)
{
        vdev->proxy = PROXY_NONE;
        vdev->proxy_index = 0;
}

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_BY_INDEX:
                return vnic_dev_cmd_proxy(vdev, CMD_PROXY_BY_INDEX, cmd,
                                a0, a1, wait);
        case PROXY_BY_BDF:
                return vnic_dev_cmd_proxy(vdev, CMD_PROXY_BY_BDF, cmd,
                                a0, a1, wait);
        case PROXY_NONE:
        default:
                return vnic_dev_cmd_no_proxy(vdev, cmd, a0, a1, wait);
        }
}

static int vnic_dev_capable(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd)
{
        u64 a0 = (u32)cmd, a1 = 0;
        int wait = 1000;
        int err;

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

        return !(err || a0);
}

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 = pci_zalloc_consistent(vdev->pdev,
                                                      sizeof(struct vnic_devcmd_fw_info),
                                                      &vdev->fw_info_pa);
                if (!vdev->fw_info)
                        return -ENOMEM;

                a0 = vdev->fw_info_pa;
                a1 = sizeof(struct vnic_devcmd_fw_info);

                /* only get fw_info once and cache it */
                if (vnic_dev_capable(vdev, CMD_MCPU_FW_INFO))
                        err = vnic_dev_cmd(vdev, CMD_MCPU_FW_INFO,
                                &a0, &a1, wait);
                else
                        err = vnic_dev_cmd(vdev, CMD_MCPU_FW_INFO_OLD,
                                &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_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
{
        u64 a0, a1;
        int wait = 1000;

        if (!vdev->stats) {
                vdev->stats = pci_alloc_consistent(vdev->pdev,
                        sizeof(struct vnic_stats), &vdev->stats_pa);
                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_wait(struct vnic_dev *vdev)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;

        if (vnic_dev_capable(vdev, CMD_ENABLE_WAIT))
                return vnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
        else
                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;
}

static 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);
}

static 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_reset(struct vnic_dev *vdev, int arg)
{
        u64 a0 = (u32)arg, a1 = 0;
        int wait = 1000;
        int err;

        if (vnic_dev_capable(vdev, CMD_HANG_RESET)) {
                return vnic_dev_cmd(vdev, CMD_HANG_RESET,
                                &a0, &a1, wait);
        } else {
                err = vnic_dev_soft_reset(vdev, arg);
                if (err)
                        return err;
                return vnic_dev_init(vdev, 0);
        }
}

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

        *done = 0;

        if (vnic_dev_capable(vdev, CMD_HANG_RESET_STATUS)) {
                err = vnic_dev_cmd(vdev, CMD_HANG_RESET_STATUS,
                                &a0, &a1, wait);
                if (err)
                        return err;
        } else {
                return vnic_dev_soft_reset_done(vdev, done);
        }

        *done = (a0 == 0);

        return 0;
}

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

int vnic_dev_get_mac_addr(struct vnic_dev *vdev, u8 *mac_addr)
{
        u64 a0, a1;
        int wait = 1000;
        int err, i;

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

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

        for (i = 0; i < ETH_ALEN; i++)
                mac_addr[i] = ((u8 *)&a0)[i];

        return 0;
}

int 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)
                pr_err("Can't set packet filter\n");

        return err;
}

int vnic_dev_add_addr(struct vnic_dev *vdev, const u8 *addr)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a0)[i] = addr[i];

        err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a0, &a1, wait);
        if (err)
                pr_err("Can't add addr [%pM], %d\n", addr, err);

        return err;
}

int vnic_dev_del_addr(struct vnic_dev *vdev, const u8 *addr)
{
        u64 a0 = 0, a1 = 0;
        int wait = 1000;
        int err;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a0)[i] = addr[i];

        err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a0, &a1, wait);
        if (err)
                pr_err("Can't del addr [%pM], %d\n", addr, err);

        return err;
}

int vnic_dev_set_ig_vlan_rewrite_mode(struct vnic_dev *vdev,
        u8 ig_vlan_rewrite_mode)
{
        u64 a0 = ig_vlan_rewrite_mode, a1 = 0;
        int wait = 1000;

        if (vnic_dev_capable(vdev, CMD_IG_VLAN_REWRITE_MODE))
                return vnic_dev_cmd(vdev, CMD_IG_VLAN_REWRITE_MODE,
                                &a0, &a1, wait);
        else
                return 0;
}

static int vnic_dev_notify_setcmd(struct vnic_dev *vdev,
        void *notify_addr, dma_addr_t notify_pa, u16 intr)
{
        u64 a0, a1;
        int wait = 1000;
        int r;

        memset(notify_addr, 0, sizeof(struct vnic_devcmd_notify));
        vdev->notify = notify_addr;
        vdev->notify_pa = notify_pa;

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

        r = vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
        vdev->notify_sz = (r == 0) ? (u32)a1 : 0;
        return r;
}

int vnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
{
        void *notify_addr;
        dma_addr_t notify_pa;

        if (vdev->notify || vdev->notify_pa) {
                pr_err("notify block %p still allocated", vdev->notify);
                return -EINVAL;
        }

        notify_addr = pci_alloc_consistent(vdev->pdev,
                        sizeof(struct vnic_devcmd_notify),
                        &notify_pa);
        if (!notify_addr)
                return -ENOMEM;

        return vnic_dev_notify_setcmd(vdev, notify_addr, notify_pa, intr);
}

static int vnic_dev_notify_unsetcmd(struct vnic_dev *vdev)
{
        u64 a0, a1;
        int wait = 1000;
        int err;

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

        err = vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
        vdev->notify = NULL;
        vdev->notify_pa = 0;
        vdev->notify_sz = 0;

        return err;
}

int vnic_dev_notify_unset(struct vnic_dev *vdev)
{
        if (vdev->notify) {
                pci_free_consistent(vdev->pdev,
                        sizeof(struct vnic_devcmd_notify),
                        vdev->notify,
                        vdev->notify_pa);
        }

        return vnic_dev_notify_unsetcmd(vdev);
}

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

        if (!vdev->notify || !vdev->notify_sz)
                return 0;

        do {
                csum = 0;
                memcpy(&vdev->notify_copy, vdev->notify, vdev->notify_sz);
                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;
        int r = 0;

        if (vnic_dev_capable(vdev, CMD_INIT))
                r = vnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
        else {
                vnic_dev_cmd(vdev, CMD_INIT_v1, &a0, &a1, wait);
                if (a0 & CMD_INITF_DEFAULT_MAC) {
                        /* Emulate these for old CMD_INIT_v1 which
                         * didn't pass a0 so no CMD_INITF_*.
                         */
                        vnic_dev_cmd(vdev, CMD_GET_MAC_ADDR, &a0, &a1, wait);
                        vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a0, &a1, wait);
                }
        }
        return r;
}

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

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

void vnic_dev_intr_coal_timer_info_default(struct vnic_dev *vdev)
{
        /* Default: hardware intr coal timer is in units of 1.5 usecs */
        vdev->intr_coal_timer_info.mul = 2;
        vdev->intr_coal_timer_info.div = 3;
        vdev->intr_coal_timer_info.max_usec =
                vnic_dev_intr_coal_timer_hw_to_usec(vdev, 0xffff);
}

int vnic_dev_intr_coal_timer_info(struct vnic_dev *vdev)
{
        int wait = 1000;
        int err;

        memset(vdev->args, 0, sizeof(vdev->args));

        if (vnic_dev_capable(vdev, CMD_INTR_COAL_CONVERT))
                err = _vnic_dev_cmd(vdev, CMD_INTR_COAL_CONVERT, wait);
        else
                err = ERR_ECMDUNKNOWN;

        /* Use defaults when firmware doesn't support the devcmd at all or
         * supports it for only specific hardware
         */
        if ((err == ERR_ECMDUNKNOWN) ||
                (!err && !(vdev->args[0] && vdev->args[1] && vdev->args[2]))) {
                pr_warn("Using default conversion factor for interrupt coalesce timer\n");
                vnic_dev_intr_coal_timer_info_default(vdev);
                return 0;
        }

        if (!err) {
                vdev->intr_coal_timer_info.mul = (u32) vdev->args[0];
                vdev->intr_coal_timer_info.div = (u32) vdev->args[1];
                vdev->intr_coal_timer_info.max_usec = (u32) vdev->args[2];
        }

        return err;
}

int vnic_dev_link_status(struct vnic_dev *vdev)
{
        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;
}

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;
}

u32 vnic_dev_intr_coal_timer_usec_to_hw(struct vnic_dev *vdev, u32 usec)
{
        return (usec * vdev->intr_coal_timer_info.mul) /
                vdev->intr_coal_timer_info.div;
}

u32 vnic_dev_intr_coal_timer_hw_to_usec(struct vnic_dev *vdev, u32 hw_cycles)
{
        return (hw_cycles * vdev->intr_coal_timer_info.div) /
                vdev->intr_coal_timer_info.mul;
}

u32 vnic_dev_get_intr_coal_timer_max(struct vnic_dev *vdev)
{
        return vdev->intr_coal_timer_info.max_usec;
}

void vnic_dev_unregister(struct vnic_dev *vdev)
{
        if (vdev) {
                if (vdev->notify)
                        pci_free_consistent(vdev->pdev,
                                sizeof(struct vnic_devcmd_notify),
                                vdev->notify,
                                vdev->notify_pa);
                if (vdev->stats)
                        pci_free_consistent(vdev->pdev,
                                sizeof(struct vnic_stats),
                                vdev->stats, vdev->stats_pa);
                if (vdev->fw_info)
                        pci_free_consistent(vdev->pdev,
                                sizeof(struct vnic_devcmd_fw_info),
                                vdev->fw_info, vdev->fw_info_pa);
                kfree(vdev);
        }
}
EXPORT_SYMBOL(vnic_dev_unregister);

struct vnic_dev *vnic_dev_register(struct vnic_dev *vdev,
        void *priv, struct pci_dev *pdev, struct vnic_dev_bar *bar,
        unsigned int num_bars)
{
        if (!vdev) {
                vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
                if (!vdev)
                        return NULL;
        }

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

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

        vdev->devcmd = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD, 0);
        if (!vdev->devcmd)
                goto err_out;

        return vdev;

err_out:
        vnic_dev_unregister(vdev);
        return NULL;
}
EXPORT_SYMBOL(vnic_dev_register);

struct pci_dev *vnic_dev_get_pdev(struct vnic_dev *vdev)
{
        return vdev->pdev;
}
EXPORT_SYMBOL(vnic_dev_get_pdev);

int vnic_dev_init_prov2(struct vnic_dev *vdev, u8 *buf, u32 len)
{
        u64 a0, a1 = len;
        int wait = 1000;
        dma_addr_t prov_pa;
        void *prov_buf;
        int ret;

        prov_buf = pci_alloc_consistent(vdev->pdev, len, &prov_pa);
        if (!prov_buf)
                return -ENOMEM;

        memcpy(prov_buf, buf, len);

        a0 = prov_pa;

        ret = vnic_dev_cmd(vdev, CMD_INIT_PROV_INFO2, &a0, &a1, wait);

        pci_free_consistent(vdev->pdev, len, prov_buf, prov_pa);

        return ret;

}

int vnic_dev_enable2(struct vnic_dev *vdev, int active)
{
        u64 a0, a1 = 0;
        int wait = 1000;

        a0 = (active ? CMD_ENABLE2_ACTIVE : 0);

        return vnic_dev_cmd(vdev, CMD_ENABLE2, &a0, &a1, wait);
}

static int vnic_dev_cmd_status(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
        int *status)
{
        u64 a0 = cmd, a1 = 0;
        int wait = 1000;
        int ret;

        ret = vnic_dev_cmd(vdev, CMD_STATUS, &a0, &a1, wait);
        if (!ret)
                *status = (int)a0;

        return ret;
}

int vnic_dev_enable2_done(struct vnic_dev *vdev, int *status)
{
        return vnic_dev_cmd_status(vdev, CMD_ENABLE2, status);
}

int vnic_dev_deinit_done(struct vnic_dev *vdev, int *status)
{
        return vnic_dev_cmd_status(vdev, CMD_DEINIT, status);
}

int vnic_dev_set_mac_addr(struct vnic_dev *vdev, u8 *mac_addr)
{
        u64 a0, a1;
        int wait = 1000;
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                ((u8 *)&a0)[i] = mac_addr[i];

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

/* vnic_dev_classifier: Add/Delete classifier entries
 * @vdev: vdev of the device
 * @cmd: CLSF_ADD for Add filter
 *       CLSF_DEL for Delete filter
 * @entry: In case of ADD filter, the caller passes the RQ number in this
 *         variable.
 *
 *         This function stores the filter_id returned by the firmware in the
 *         same variable before return;
 *
 *         In case of DEL filter, the caller passes the RQ number. Return
 *         value is irrelevant.
 * @data: filter data
 */
int vnic_dev_classifier(struct vnic_dev *vdev, u8 cmd, u16 *entry,
                        struct filter *data)
{
        u64 a0, a1;
        int wait = 1000;
        dma_addr_t tlv_pa;
        int ret = -EINVAL;
        struct filter_tlv *tlv, *tlv_va;
        struct filter_action *action;
        u64 tlv_size;

        if (cmd == CLSF_ADD) {
                tlv_size = sizeof(struct filter) +
                           sizeof(struct filter_action) +
                           2 * sizeof(struct filter_tlv);
                tlv_va = pci_alloc_consistent(vdev->pdev, tlv_size, &tlv_pa);
                if (!tlv_va)
                        return -ENOMEM;
                tlv = tlv_va;
                a0 = tlv_pa;
                a1 = tlv_size;
                memset(tlv, 0, tlv_size);
                tlv->type = CLSF_TLV_FILTER;
                tlv->length = sizeof(struct filter);
                *(struct filter *)&tlv->val = *data;

                tlv = (struct filter_tlv *)((char *)tlv +
                                            sizeof(struct filter_tlv) +
                                            sizeof(struct filter));

                tlv->type = CLSF_TLV_ACTION;
                tlv->length = sizeof(struct filter_action);
                action = (struct filter_action *)&tlv->val;
                action->type = FILTER_ACTION_RQ_STEERING;
                action->u.rq_idx = *entry;

                ret = vnic_dev_cmd(vdev, CMD_ADD_FILTER, &a0, &a1, wait);
                *entry = (u16)a0;
                pci_free_consistent(vdev->pdev, tlv_size, tlv_va, tlv_pa);
        } else if (cmd == CLSF_DEL) {
                a0 = *entry;
                ret = vnic_dev_cmd(vdev, CMD_DEL_FILTER, &a0, &a1, wait);
        }

        return ret;
}