// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */

#include "vf.h"
#include "ixgbevf.h"

/* On Hyper-V, to reset, we need to read from this offset
 * from the PCI config space. This is the mechanism used on
 * Hyper-V to support PF/VF communication.
 */
#define IXGBE_HV_RESET_OFFSET           0x201

static inline s32 ixgbevf_write_msg_read_ack(struct ixgbe_hw *hw, u32 *msg,
                                             u32 *retmsg, u16 size)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        s32 retval = mbx->ops.write_posted(hw, msg, size);

        if (retval)
                return retval;

        return mbx->ops.read_posted(hw, retmsg, size);
}

/**
 *  ixgbevf_start_hw_vf - Prepare hardware for Tx/Rx
 *  @hw: pointer to hardware structure
 *
 *  Starts the hardware by filling the bus info structure and media type, clears
 *  all on chip counters, initializes receive address registers, multicast
 *  table, VLAN filter table, calls routine to set up link and flow control
 *  settings, and leaves transmit and receive units disabled and uninitialized
 **/
static s32 ixgbevf_start_hw_vf(struct ixgbe_hw *hw)
{
        /* Clear adapter stopped flag */
        hw->adapter_stopped = false;

        return 0;
}

/**
 *  ixgbevf_init_hw_vf - virtual function hardware initialization
 *  @hw: pointer to hardware structure
 *
 *  Initialize the hardware by resetting the hardware and then starting
 *  the hardware
 **/
static s32 ixgbevf_init_hw_vf(struct ixgbe_hw *hw)
{
        s32 status = hw->mac.ops.start_hw(hw);

        hw->mac.ops.get_mac_addr(hw, hw->mac.addr);

        return status;
}

/**
 *  ixgbevf_reset_hw_vf - Performs hardware reset
 *  @hw: pointer to hardware structure
 *
 *  Resets the hardware by resetting the transmit and receive units, masks and
 *  clears all interrupts.
 **/
static s32 ixgbevf_reset_hw_vf(struct ixgbe_hw *hw)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        u32 timeout = IXGBE_VF_INIT_TIMEOUT;
        s32 ret_val = IXGBE_ERR_INVALID_MAC_ADDR;
        u32 msgbuf[IXGBE_VF_PERMADDR_MSG_LEN];
        u8 *addr = (u8 *)(&msgbuf[1]);

        /* Call adapter stop to disable tx/rx and clear interrupts */
        hw->mac.ops.stop_adapter(hw);

        /* reset the api version */
        hw->api_version = ixgbe_mbox_api_10;

        IXGBE_WRITE_REG(hw, IXGBE_VFCTRL, IXGBE_CTRL_RST);
        IXGBE_WRITE_FLUSH(hw);

        /* we cannot reset while the RSTI / RSTD bits are asserted */
        while (!mbx->ops.check_for_rst(hw) && timeout) {
                timeout--;
                udelay(5);
        }

        if (!timeout)
                return IXGBE_ERR_RESET_FAILED;

        /* mailbox timeout can now become active */
        mbx->timeout = IXGBE_VF_MBX_INIT_TIMEOUT;

        msgbuf[0] = IXGBE_VF_RESET;
        mbx->ops.write_posted(hw, msgbuf, 1);

        mdelay(10);

        /* set our "perm_addr" based on info provided by PF
         * also set up the mc_filter_type which is piggy backed
         * on the mac address in word 3
         */
        ret_val = mbx->ops.read_posted(hw, msgbuf, IXGBE_VF_PERMADDR_MSG_LEN);
        if (ret_val)
                return ret_val;

        /* New versions of the PF may NACK the reset return message
         * to indicate that no MAC address has yet been assigned for
         * the VF.
         */
        if (msgbuf[0] != (IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_ACK) &&
            msgbuf[0] != (IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_NACK))
                return IXGBE_ERR_INVALID_MAC_ADDR;

        if (msgbuf[0] == (IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_ACK))
                ether_addr_copy(hw->mac.perm_addr, addr);

        hw->mac.mc_filter_type = msgbuf[IXGBE_VF_MC_TYPE_WORD];

        return 0;
}

/**
 * ixgbevf_hv_reset_hw_vf - reset via Hyper-V
 * @hw: pointer to private hardware struct
 *
 * Hyper-V variant; the VF/PF communication is through the PCI
 * config space.
 */
static s32 ixgbevf_hv_reset_hw_vf(struct ixgbe_hw *hw)
{
#if IS_ENABLED(CONFIG_PCI_MMCONFIG)
        struct ixgbevf_adapter *adapter = hw->back;
        int i;

        for (i = 0; i < 6; i++)
                pci_read_config_byte(adapter->pdev,
                                     (i + IXGBE_HV_RESET_OFFSET),
                                     &hw->mac.perm_addr[i]);
        return 0;
#else
        pr_err("PCI_MMCONFIG needs to be enabled for Hyper-V\n");
        return -EOPNOTSUPP;
#endif
}

/**
 *  ixgbevf_stop_hw_vf - Generic stop Tx/Rx units
 *  @hw: pointer to hardware structure
 *
 *  Sets the adapter_stopped flag within ixgbe_hw struct. Clears interrupts,
 *  disables transmit and receive units. The adapter_stopped flag is used by
 *  the shared code and drivers to determine if the adapter is in a stopped
 *  state and should not touch the hardware.
 **/
static s32 ixgbevf_stop_hw_vf(struct ixgbe_hw *hw)
{
        u32 number_of_queues;
        u32 reg_val;
        u16 i;

        /* Set the adapter_stopped flag so other driver functions stop touching
         * the hardware
         */
        hw->adapter_stopped = true;

        /* Disable the receive unit by stopped each queue */
        number_of_queues = hw->mac.max_rx_queues;
        for (i = 0; i < number_of_queues; i++) {
                reg_val = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(i));
                if (reg_val & IXGBE_RXDCTL_ENABLE) {
                        reg_val &= ~IXGBE_RXDCTL_ENABLE;
                        IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(i), reg_val);
                }
        }

        IXGBE_WRITE_FLUSH(hw);

        /* Clear interrupt mask to stop from interrupts being generated */
        IXGBE_WRITE_REG(hw, IXGBE_VTEIMC, IXGBE_VF_IRQ_CLEAR_MASK);

        /* Clear any pending interrupts */
        IXGBE_READ_REG(hw, IXGBE_VTEICR);

        /* Disable the transmit unit.  Each queue must be disabled. */
        number_of_queues = hw->mac.max_tx_queues;
        for (i = 0; i < number_of_queues; i++) {
                reg_val = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(i));
                if (reg_val & IXGBE_TXDCTL_ENABLE) {
                        reg_val &= ~IXGBE_TXDCTL_ENABLE;
                        IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(i), reg_val);
                }
        }

        return 0;
}

/**
 *  ixgbevf_mta_vector - Determines bit-vector in multicast table to set
 *  @hw: pointer to hardware structure
 *  @mc_addr: the multicast address
 *
 *  Extracts the 12 bits, from a multicast address, to determine which
 *  bit-vector to set in the multicast table. The hardware uses 12 bits, from
 *  incoming Rx multicast addresses, to determine the bit-vector to check in
 *  the MTA. Which of the 4 combination, of 12-bits, the hardware uses is set
 *  by the MO field of the MCSTCTRL. The MO field is set during initialization
 *  to mc_filter_type.
 **/
static s32 ixgbevf_mta_vector(struct ixgbe_hw *hw, u8 *mc_addr)
{
        u32 vector = 0;

        switch (hw->mac.mc_filter_type) {
        case 0:   /* use bits [47:36] of the address */
                vector = ((mc_addr[4] >> 4) | (((u16)mc_addr[5]) << 4));
                break;
        case 1:   /* use bits [46:35] of the address */
                vector = ((mc_addr[4] >> 3) | (((u16)mc_addr[5]) << 5));
                break;
        case 2:   /* use bits [45:34] of the address */
                vector = ((mc_addr[4] >> 2) | (((u16)mc_addr[5]) << 6));
                break;
        case 3:   /* use bits [43:32] of the address */
                vector = ((mc_addr[4]) | (((u16)mc_addr[5]) << 8));
                break;
        default:  /* Invalid mc_filter_type */
                break;
        }

        /* vector can only be 12-bits or boundary will be exceeded */
        vector &= 0xFFF;
        return vector;
}

/**
 *  ixgbevf_get_mac_addr_vf - Read device MAC address
 *  @hw: pointer to the HW structure
 *  @mac_addr: pointer to storage for retrieved MAC address
 **/
static s32 ixgbevf_get_mac_addr_vf(struct ixgbe_hw *hw, u8 *mac_addr)
{
        ether_addr_copy(mac_addr, hw->mac.perm_addr);

        return 0;
}

static s32 ixgbevf_set_uc_addr_vf(struct ixgbe_hw *hw, u32 index, u8 *addr)
{
        u32 msgbuf[3], msgbuf_chk;
        u8 *msg_addr = (u8 *)(&msgbuf[1]);
        s32 ret_val;

        memset(msgbuf, 0, sizeof(msgbuf));
        /* If index is one then this is the start of a new list and needs
         * indication to the PF so it can do it's own list management.
         * If it is zero then that tells the PF to just clear all of
         * this VF's macvlans and there is no new list.
         */
        msgbuf[0] |= index << IXGBE_VT_MSGINFO_SHIFT;
        msgbuf[0] |= IXGBE_VF_SET_MACVLAN;
        msgbuf_chk = msgbuf[0];

        if (addr)
                ether_addr_copy(msg_addr, addr);

        ret_val = ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf,
                                             ARRAY_SIZE(msgbuf));
        if (!ret_val) {
                msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;

                if (msgbuf[0] == (msgbuf_chk | IXGBE_VT_MSGTYPE_NACK))
                        return -ENOMEM;
        }

        return ret_val;
}

static s32 ixgbevf_hv_set_uc_addr_vf(struct ixgbe_hw *hw, u32 index, u8 *addr)
{
        return -EOPNOTSUPP;
}

/**
 * ixgbevf_get_reta_locked - get the RSS redirection table (RETA) contents.
 * @hw: pointer to hardware structure
 * @reta: buffer to fill with RETA contents.
 * @num_rx_queues: Number of Rx queues configured for this port
 *
 * The "reta" buffer should be big enough to contain 32 registers.
 *
 * Returns: 0 on success.
 *          if API doesn't support this operation - (-EOPNOTSUPP).
 */
int ixgbevf_get_reta_locked(struct ixgbe_hw *hw, u32 *reta, int num_rx_queues)
{
        int err, i, j;
        u32 msgbuf[IXGBE_VFMAILBOX_SIZE];
        u32 *hw_reta = &msgbuf[1];
        u32 mask = 0;

        /* We have to use a mailbox for 82599 and x540 devices only.
         * For these devices RETA has 128 entries.
         * Also these VFs support up to 4 RSS queues. Therefore PF will compress
         * 16 RETA entries in each DWORD giving 2 bits to each entry.
         */
        int dwords = IXGBEVF_82599_RETA_SIZE / 16;

        /* We support the RSS querying for 82599 and x540 devices only.
         * Thus return an error if API doesn't support RETA querying or querying
         * is not supported for this device type.
         */
        switch (hw->api_version) {
        case ixgbe_mbox_api_14:
        case ixgbe_mbox_api_13:
        case ixgbe_mbox_api_12:
                if (hw->mac.type < ixgbe_mac_X550_vf)
                        break;
                fallthrough;
        default:
                return -EOPNOTSUPP;
        }

        msgbuf[0] = IXGBE_VF_GET_RETA;

        err = hw->mbx.ops.write_posted(hw, msgbuf, 1);

        if (err)
                return err;

        err = hw->mbx.ops.read_posted(hw, msgbuf, dwords + 1);

        if (err)
                return err;

        msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;

        /* If the operation has been refused by a PF return -EPERM */
        if (msgbuf[0] == (IXGBE_VF_GET_RETA | IXGBE_VT_MSGTYPE_NACK))
                return -EPERM;

        /* If we didn't get an ACK there must have been
         * some sort of mailbox error so we should treat it
         * as such.
         */
        if (msgbuf[0] != (IXGBE_VF_GET_RETA | IXGBE_VT_MSGTYPE_ACK))
                return IXGBE_ERR_MBX;

        /* ixgbevf doesn't support more than 2 queues at the moment */
        if (num_rx_queues > 1)
                mask = 0x1;

        for (i = 0; i < dwords; i++)
                for (j = 0; j < 16; j++)
                        reta[i * 16 + j] = (hw_reta[i] >> (2 * j)) & mask;

        return 0;
}

/**
 * ixgbevf_get_rss_key_locked - get the RSS Random Key
 * @hw: pointer to the HW structure
 * @rss_key: buffer to fill with RSS Hash Key contents.
 *
 * The "rss_key" buffer should be big enough to contain 10 registers.
 *
 * Returns: 0 on success.
 *          if API doesn't support this operation - (-EOPNOTSUPP).
 */
int ixgbevf_get_rss_key_locked(struct ixgbe_hw *hw, u8 *rss_key)
{
        int err;
        u32 msgbuf[IXGBE_VFMAILBOX_SIZE];

        /* We currently support the RSS Random Key retrieval for 82599 and x540
         * devices only.
         *
         * Thus return an error if API doesn't support RSS Random Key retrieval
         * or if the operation is not supported for this device type.
         */
        switch (hw->api_version) {
        case ixgbe_mbox_api_14:
        case ixgbe_mbox_api_13:
        case ixgbe_mbox_api_12:
                if (hw->mac.type < ixgbe_mac_X550_vf)
                        break;
                fallthrough;
        default:
                return -EOPNOTSUPP;
        }

        msgbuf[0] = IXGBE_VF_GET_RSS_KEY;
        err = hw->mbx.ops.write_posted(hw, msgbuf, 1);

        if (err)
                return err;

        err = hw->mbx.ops.read_posted(hw, msgbuf, 11);

        if (err)
                return err;

        msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;

        /* If the operation has been refused by a PF return -EPERM */
        if (msgbuf[0] == (IXGBE_VF_GET_RSS_KEY | IXGBE_VT_MSGTYPE_NACK))
                return -EPERM;

        /* If we didn't get an ACK there must have been
         * some sort of mailbox error so we should treat it
         * as such.
         */
        if (msgbuf[0] != (IXGBE_VF_GET_RSS_KEY | IXGBE_VT_MSGTYPE_ACK))
                return IXGBE_ERR_MBX;

        memcpy(rss_key, msgbuf + 1, IXGBEVF_RSS_HASH_KEY_SIZE);

        return 0;
}

/**
 *  ixgbevf_set_rar_vf - set device MAC address
 *  @hw: pointer to hardware structure
 *  @index: Receive address register to write
 *  @addr: Address to put into receive address register
 *  @vmdq: Unused in this implementation
 **/
static s32 ixgbevf_set_rar_vf(struct ixgbe_hw *hw, u32 index, u8 *addr,
                              u32 vmdq)
{
        u32 msgbuf[3];
        u8 *msg_addr = (u8 *)(&msgbuf[1]);
        s32 ret_val;

        memset(msgbuf, 0, sizeof(msgbuf));
        msgbuf[0] = IXGBE_VF_SET_MAC_ADDR;
        ether_addr_copy(msg_addr, addr);

        ret_val = ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf,
                                             ARRAY_SIZE(msgbuf));
        msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;

        /* if nacked the address was rejected, use "perm_addr" */
        if (!ret_val &&
            (msgbuf[0] == (IXGBE_VF_SET_MAC_ADDR | IXGBE_VT_MSGTYPE_NACK))) {
                ixgbevf_get_mac_addr_vf(hw, hw->mac.addr);
                return IXGBE_ERR_MBX;
        }

        return ret_val;
}

/**
 *  ixgbevf_hv_set_rar_vf - set device MAC address Hyper-V variant
 *  @hw: pointer to hardware structure
 *  @index: Receive address register to write
 *  @addr: Address to put into receive address register
 *  @vmdq: Unused in this implementation
 *
 * We don't really allow setting the device MAC address. However,
 * if the address being set is the permanent MAC address we will
 * permit that.
 **/
static s32 ixgbevf_hv_set_rar_vf(struct ixgbe_hw *hw, u32 index, u8 *addr,
                                 u32 vmdq)
{
        if (ether_addr_equal(addr, hw->mac.perm_addr))
                return 0;

        return -EOPNOTSUPP;
}

/**
 *  ixgbevf_update_mc_addr_list_vf - Update Multicast addresses
 *  @hw: pointer to the HW structure
 *  @netdev: pointer to net device structure
 *
 *  Updates the Multicast Table Array.
 **/
static s32 ixgbevf_update_mc_addr_list_vf(struct ixgbe_hw *hw,
                                          struct net_device *netdev)
{
        struct netdev_hw_addr *ha;
        u32 msgbuf[IXGBE_VFMAILBOX_SIZE];
        u16 *vector_list = (u16 *)&msgbuf[1];
        u32 cnt, i;

        /* Each entry in the list uses 1 16 bit word.  We have 30
         * 16 bit words available in our HW msg buffer (minus 1 for the
         * msg type).  That's 30 hash values if we pack 'em right.  If
         * there are more than 30 MC addresses to add then punt the
         * extras for now and then add code to handle more than 30 later.
         * It would be unusual for a server to request that many multi-cast
         * addresses except for in large enterprise network environments.
         */

        cnt = netdev_mc_count(netdev);
        if (cnt > 30)
                cnt = 30;
        msgbuf[0] = IXGBE_VF_SET_MULTICAST;
        msgbuf[0] |= cnt << IXGBE_VT_MSGINFO_SHIFT;

        i = 0;
        netdev_for_each_mc_addr(ha, netdev) {
                if (i == cnt)
                        break;
                if (is_link_local_ether_addr(ha->addr))
                        continue;

                vector_list[i++] = ixgbevf_mta_vector(hw, ha->addr);
        }

        return ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf,
                        IXGBE_VFMAILBOX_SIZE);
}

/**
 * ixgbevf_hv_update_mc_addr_list_vf - stub
 * @hw: unused
 * @netdev: unused
 *
 * Hyper-V variant - just a stub.
 */
static s32 ixgbevf_hv_update_mc_addr_list_vf(struct ixgbe_hw *hw,
                                             struct net_device *netdev)
{
        return -EOPNOTSUPP;
}

/**
 *  ixgbevf_update_xcast_mode - Update Multicast mode
 *  @hw: pointer to the HW structure
 *  @xcast_mode: new multicast mode
 *
 *  Updates the Multicast Mode of VF.
 **/
static s32 ixgbevf_update_xcast_mode(struct ixgbe_hw *hw, int xcast_mode)
{
        u32 msgbuf[2];
        s32 err;

        switch (hw->api_version) {
        case ixgbe_mbox_api_12:
                /* promisc introduced in 1.3 version */
                if (xcast_mode == IXGBEVF_XCAST_MODE_PROMISC)
                        return -EOPNOTSUPP;
                fallthrough;
        case ixgbe_mbox_api_14:
        case ixgbe_mbox_api_13:
                break;
        default:
                return -EOPNOTSUPP;
        }

        msgbuf[0] = IXGBE_VF_UPDATE_XCAST_MODE;
        msgbuf[1] = xcast_mode;

        err = ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf,
                                         ARRAY_SIZE(msgbuf));
        if (err)
                return err;

        msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;
        if (msgbuf[0] == (IXGBE_VF_UPDATE_XCAST_MODE | IXGBE_VT_MSGTYPE_NACK))
                return -EPERM;

        return 0;
}

/**
 * ixgbevf_hv_update_xcast_mode - stub
 * @hw: unused
 * @xcast_mode: unused
 *
 * Hyper-V variant - just a stub.
 */
static s32 ixgbevf_hv_update_xcast_mode(struct ixgbe_hw *hw, int xcast_mode)
{
        return -EOPNOTSUPP;
}

/**
 *  ixgbevf_set_vfta_vf - Set/Unset VLAN filter table address
 *  @hw: pointer to the HW structure
 *  @vlan: 12 bit VLAN ID
 *  @vind: unused by VF drivers
 *  @vlan_on: if true then set bit, else clear bit
 **/
static s32 ixgbevf_set_vfta_vf(struct ixgbe_hw *hw, u32 vlan, u32 vind,
                               bool vlan_on)
{
        u32 msgbuf[2];
        s32 err;

        msgbuf[0] = IXGBE_VF_SET_VLAN;
        msgbuf[1] = vlan;
        /* Setting the 8 bit field MSG INFO to TRUE indicates "add" */
        msgbuf[0] |= vlan_on << IXGBE_VT_MSGINFO_SHIFT;

        err = ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf,
                                         ARRAY_SIZE(msgbuf));
        if (err)
                goto mbx_err;

        /* remove extra bits from the message */
        msgbuf[0] &= ~IXGBE_VT_MSGTYPE_CTS;
        msgbuf[0] &= ~(0xFF << IXGBE_VT_MSGINFO_SHIFT);

        if (msgbuf[0] != (IXGBE_VF_SET_VLAN | IXGBE_VT_MSGTYPE_ACK))
                err = IXGBE_ERR_INVALID_ARGUMENT;

mbx_err:
        return err;
}

/**
 * ixgbevf_hv_set_vfta_vf - * Hyper-V variant - just a stub.
 * @hw: unused
 * @vlan: unused
 * @vind: unused
 * @vlan_on: unused
 */
static s32 ixgbevf_hv_set_vfta_vf(struct ixgbe_hw *hw, u32 vlan, u32 vind,
                                  bool vlan_on)
{
        return -EOPNOTSUPP;
}

/**
 *  ixgbevf_setup_mac_link_vf - Setup MAC link settings
 *  @hw: pointer to hardware structure
 *  @speed: Unused in this implementation
 *  @autoneg: Unused in this implementation
 *  @autoneg_wait_to_complete: Unused in this implementation
 *
 *  Do nothing and return success.  VF drivers are not allowed to change
 *  global settings.  Maintained for driver compatibility.
 **/
static s32 ixgbevf_setup_mac_link_vf(struct ixgbe_hw *hw,
                                     ixgbe_link_speed speed, bool autoneg,
                                     bool autoneg_wait_to_complete)
{
        return 0;
}

/**
 *  ixgbevf_check_mac_link_vf - Get link/speed status
 *  @hw: pointer to hardware structure
 *  @speed: pointer to link speed
 *  @link_up: true is link is up, false otherwise
 *  @autoneg_wait_to_complete: unused
 *
 *  Reads the links register to determine if link is up and the current speed
 **/
static s32 ixgbevf_check_mac_link_vf(struct ixgbe_hw *hw,
                                     ixgbe_link_speed *speed,
                                     bool *link_up,
                                     bool autoneg_wait_to_complete)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        struct ixgbe_mac_info *mac = &hw->mac;
        s32 ret_val = 0;
        u32 links_reg;
        u32 in_msg = 0;

        /* If we were hit with a reset drop the link */
        if (!mbx->ops.check_for_rst(hw) || !mbx->timeout)
                mac->get_link_status = true;

        if (!mac->get_link_status)
                goto out;

        /* if link status is down no point in checking to see if pf is up */
        links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);
        if (!(links_reg & IXGBE_LINKS_UP))
                goto out;

        /* for SFP+ modules and DA cables on 82599 it can take up to 500usecs
         * before the link status is correct
         */
        if (mac->type == ixgbe_mac_82599_vf) {
                int i;

                for (i = 0; i < 5; i++) {
                        udelay(100);
                        links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);

                        if (!(links_reg & IXGBE_LINKS_UP))
                                goto out;
                }
        }

        switch (links_reg & IXGBE_LINKS_SPEED_82599) {
        case IXGBE_LINKS_SPEED_10G_82599:
                *speed = IXGBE_LINK_SPEED_10GB_FULL;
                break;
        case IXGBE_LINKS_SPEED_1G_82599:
                *speed = IXGBE_LINK_SPEED_1GB_FULL;
                break;
        case IXGBE_LINKS_SPEED_100_82599:
                *speed = IXGBE_LINK_SPEED_100_FULL;
                break;
        }

        /* if the read failed it could just be a mailbox collision, best wait
         * until we are called again and don't report an error
         */
        if (mbx->ops.read(hw, &in_msg, 1))
                goto out;

        if (!(in_msg & IXGBE_VT_MSGTYPE_CTS)) {
                /* msg is not CTS and is NACK we must have lost CTS status */
                if (in_msg & IXGBE_VT_MSGTYPE_NACK)
                        ret_val = -1;
                goto out;
        }

        /* the pf is talking, if we timed out in the past we reinit */
        if (!mbx->timeout) {
                ret_val = -1;
                goto out;
        }

        /* if we passed all the tests above then the link is up and we no
         * longer need to check for link
         */
        mac->get_link_status = false;

out:
        *link_up = !mac->get_link_status;
        return ret_val;
}

/**
 * ixgbevf_hv_check_mac_link_vf - check link
 * @hw: pointer to private hardware struct
 * @speed: pointer to link speed
 * @link_up: true is link is up, false otherwise
 * @autoneg_wait_to_complete: unused
 *
 * Hyper-V variant; there is no mailbox communication.
 */
static s32 ixgbevf_hv_check_mac_link_vf(struct ixgbe_hw *hw,
                                        ixgbe_link_speed *speed,
                                        bool *link_up,
                                        bool autoneg_wait_to_complete)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        struct ixgbe_mac_info *mac = &hw->mac;
        u32 links_reg;

        /* If we were hit with a reset drop the link */
        if (!mbx->ops.check_for_rst(hw) || !mbx->timeout)
                mac->get_link_status = true;

        if (!mac->get_link_status)
                goto out;

        /* if link status is down no point in checking to see if pf is up */
        links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);
        if (!(links_reg & IXGBE_LINKS_UP))
                goto out;

        /* for SFP+ modules and DA cables on 82599 it can take up to 500usecs
         * before the link status is correct
         */
        if (mac->type == ixgbe_mac_82599_vf) {
                int i;

                for (i = 0; i < 5; i++) {
                        udelay(100);
                        links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);

                        if (!(links_reg & IXGBE_LINKS_UP))
                                goto out;
                }
        }

        switch (links_reg & IXGBE_LINKS_SPEED_82599) {
        case IXGBE_LINKS_SPEED_10G_82599:
                *speed = IXGBE_LINK_SPEED_10GB_FULL;
                break;
        case IXGBE_LINKS_SPEED_1G_82599:
                *speed = IXGBE_LINK_SPEED_1GB_FULL;
                break;
        case IXGBE_LINKS_SPEED_100_82599:
                *speed = IXGBE_LINK_SPEED_100_FULL;
                break;
        }

        /* if we passed all the tests above then the link is up and we no
         * longer need to check for link
         */
        mac->get_link_status = false;

out:
        *link_up = !mac->get_link_status;
        return 0;
}

/**
 *  ixgbevf_set_rlpml_vf - Set the maximum receive packet length
 *  @hw: pointer to the HW structure
 *  @max_size: value to assign to max frame size
 **/
static s32 ixgbevf_set_rlpml_vf(struct ixgbe_hw *hw, u16 max_size)
{
        u32 msgbuf[2];
        s32 ret_val;

        msgbuf[0] = IXGBE_VF_SET_LPE;
        msgbuf[1] = max_size;

        ret_val = ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf,
                                             ARRAY_SIZE(msgbuf));
        if (ret_val)
                return ret_val;
        if ((msgbuf[0] & IXGBE_VF_SET_LPE) &&
            (msgbuf[0] & IXGBE_VT_MSGTYPE_NACK))
                return IXGBE_ERR_MBX;

        return 0;
}

/**
 * ixgbevf_hv_set_rlpml_vf - Set the maximum receive packet length
 * @hw: pointer to the HW structure
 * @max_size: value to assign to max frame size
 * Hyper-V variant.
 **/
static s32 ixgbevf_hv_set_rlpml_vf(struct ixgbe_hw *hw, u16 max_size)
{
        u32 reg;

        /* If we are on Hyper-V, we implement this functionality
         * differently.
         */
        reg =  IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(0));
        /* CRC == 4 */
        reg |= ((max_size + 4) | IXGBE_RXDCTL_RLPML_EN);
        IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(0), reg);

        return 0;
}

/**
 *  ixgbevf_negotiate_api_version_vf - Negotiate supported API version
 *  @hw: pointer to the HW structure
 *  @api: integer containing requested API version
 **/
static int ixgbevf_negotiate_api_version_vf(struct ixgbe_hw *hw, int api)
{
        int err;
        u32 msg[3];

        /* Negotiate the mailbox API version */
        msg[0] = IXGBE_VF_API_NEGOTIATE;
        msg[1] = api;
        msg[2] = 0;

        err = ixgbevf_write_msg_read_ack(hw, msg, msg, ARRAY_SIZE(msg));
        if (!err) {
                msg[0] &= ~IXGBE_VT_MSGTYPE_CTS;

                /* Store value and return 0 on success */
                if (msg[0] == (IXGBE_VF_API_NEGOTIATE | IXGBE_VT_MSGTYPE_ACK)) {
                        hw->api_version = api;
                        return 0;
                }

                err = IXGBE_ERR_INVALID_ARGUMENT;
        }

        return err;
}

/**
 *  ixgbevf_hv_negotiate_api_version_vf - Negotiate supported API version
 *  @hw: pointer to the HW structure
 *  @api: integer containing requested API version
 *  Hyper-V version - only ixgbe_mbox_api_10 supported.
 **/
static int ixgbevf_hv_negotiate_api_version_vf(struct ixgbe_hw *hw, int api)
{
        /* Hyper-V only supports api version ixgbe_mbox_api_10 */
        if (api != ixgbe_mbox_api_10)
                return IXGBE_ERR_INVALID_ARGUMENT;

        return 0;
}

int ixgbevf_get_queues(struct ixgbe_hw *hw, unsigned int *num_tcs,
                       unsigned int *default_tc)
{
        int err;
        u32 msg[5];

        /* do nothing if API doesn't support ixgbevf_get_queues */
        switch (hw->api_version) {
        case ixgbe_mbox_api_11:
        case ixgbe_mbox_api_12:
        case ixgbe_mbox_api_13:
        case ixgbe_mbox_api_14:
                break;
        default:
                return 0;
        }

        /* Fetch queue configuration from the PF */
        msg[0] = IXGBE_VF_GET_QUEUE;
        msg[1] = msg[2] = msg[3] = msg[4] = 0;

        err = ixgbevf_write_msg_read_ack(hw, msg, msg, ARRAY_SIZE(msg));
        if (!err) {
                msg[0] &= ~IXGBE_VT_MSGTYPE_CTS;

                /* if we we didn't get an ACK there must have been
                 * some sort of mailbox error so we should treat it
                 * as such
                 */
                if (msg[0] != (IXGBE_VF_GET_QUEUE | IXGBE_VT_MSGTYPE_ACK))
                        return IXGBE_ERR_MBX;

                /* record and validate values from message */
                hw->mac.max_tx_queues = msg[IXGBE_VF_TX_QUEUES];
                if (hw->mac.max_tx_queues == 0 ||
                    hw->mac.max_tx_queues > IXGBE_VF_MAX_TX_QUEUES)
                        hw->mac.max_tx_queues = IXGBE_VF_MAX_TX_QUEUES;

                hw->mac.max_rx_queues = msg[IXGBE_VF_RX_QUEUES];
                if (hw->mac.max_rx_queues == 0 ||
                    hw->mac.max_rx_queues > IXGBE_VF_MAX_RX_QUEUES)
                        hw->mac.max_rx_queues = IXGBE_VF_MAX_RX_QUEUES;

                *num_tcs = msg[IXGBE_VF_TRANS_VLAN];
                /* in case of unknown state assume we cannot tag frames */
                if (*num_tcs > hw->mac.max_rx_queues)
                        *num_tcs = 1;

                *default_tc = msg[IXGBE_VF_DEF_QUEUE];
                /* default to queue 0 on out-of-bounds queue number */
                if (*default_tc >= hw->mac.max_tx_queues)
                        *default_tc = 0;
        }

        return err;
}

static const struct ixgbe_mac_operations ixgbevf_mac_ops = {
        .init_hw                = ixgbevf_init_hw_vf,
        .reset_hw               = ixgbevf_reset_hw_vf,
        .start_hw               = ixgbevf_start_hw_vf,
        .get_mac_addr           = ixgbevf_get_mac_addr_vf,
        .stop_adapter           = ixgbevf_stop_hw_vf,
        .setup_link             = ixgbevf_setup_mac_link_vf,
        .check_link             = ixgbevf_check_mac_link_vf,
        .negotiate_api_version  = ixgbevf_negotiate_api_version_vf,
        .set_rar                = ixgbevf_set_rar_vf,
        .update_mc_addr_list    = ixgbevf_update_mc_addr_list_vf,
        .update_xcast_mode      = ixgbevf_update_xcast_mode,
        .set_uc_addr            = ixgbevf_set_uc_addr_vf,
        .set_vfta               = ixgbevf_set_vfta_vf,
        .set_rlpml              = ixgbevf_set_rlpml_vf,
};

static const struct ixgbe_mac_operations ixgbevf_hv_mac_ops = {
        .init_hw                = ixgbevf_init_hw_vf,
        .reset_hw               = ixgbevf_hv_reset_hw_vf,
        .start_hw               = ixgbevf_start_hw_vf,
        .get_mac_addr           = ixgbevf_get_mac_addr_vf,
        .stop_adapter           = ixgbevf_stop_hw_vf,
        .setup_link             = ixgbevf_setup_mac_link_vf,
        .check_link             = ixgbevf_hv_check_mac_link_vf,
        .negotiate_api_version  = ixgbevf_hv_negotiate_api_version_vf,
        .set_rar                = ixgbevf_hv_set_rar_vf,
        .update_mc_addr_list    = ixgbevf_hv_update_mc_addr_list_vf,
        .update_xcast_mode      = ixgbevf_hv_update_xcast_mode,
        .set_uc_addr            = ixgbevf_hv_set_uc_addr_vf,
        .set_vfta               = ixgbevf_hv_set_vfta_vf,
        .set_rlpml              = ixgbevf_hv_set_rlpml_vf,
};

const struct ixgbevf_info ixgbevf_82599_vf_info = {
        .mac = ixgbe_mac_82599_vf,
        .mac_ops = &ixgbevf_mac_ops,
};

const struct ixgbevf_info ixgbevf_82599_vf_hv_info = {
        .mac = ixgbe_mac_82599_vf,
        .mac_ops = &ixgbevf_hv_mac_ops,
};

const struct ixgbevf_info ixgbevf_X540_vf_info = {
        .mac = ixgbe_mac_X540_vf,
        .mac_ops = &ixgbevf_mac_ops,
};

const struct ixgbevf_info ixgbevf_X540_vf_hv_info = {
        .mac = ixgbe_mac_X540_vf,
        .mac_ops = &ixgbevf_hv_mac_ops,

};

const struct ixgbevf_info ixgbevf_X550_vf_info = {
        .mac = ixgbe_mac_X550_vf,
        .mac_ops = &ixgbevf_mac_ops,
};

const struct ixgbevf_info ixgbevf_X550_vf_hv_info = {
        .mac = ixgbe_mac_X550_vf,
        .mac_ops = &ixgbevf_hv_mac_ops,
};

const struct ixgbevf_info ixgbevf_X550EM_x_vf_info = {
        .mac = ixgbe_mac_X550EM_x_vf,
        .mac_ops = &ixgbevf_mac_ops,
};

const struct ixgbevf_info ixgbevf_X550EM_x_vf_hv_info = {
        .mac = ixgbe_mac_X550EM_x_vf,
        .mac_ops = &ixgbevf_hv_mac_ops,
};

const struct ixgbevf_info ixgbevf_x550em_a_vf_info = {
        .mac = ixgbe_mac_x550em_a_vf,
        .mac_ops = &ixgbevf_mac_ops,
};