/******************************************************************************
  SPDX-License-Identifier: BSD-3-Clause

  Copyright (c) 2001-2020, Intel Corporation
  All rights reserved.

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  modification, are permitted provided that the following conditions are met:

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******************************************************************************/


#include "e1000_api.h"


static s32 e1000_init_phy_params_vf(struct e1000_hw *hw);
static s32 e1000_init_nvm_params_vf(struct e1000_hw *hw);
static void e1000_release_vf(struct e1000_hw *hw);
static s32 e1000_acquire_vf(struct e1000_hw *hw);
static s32 e1000_setup_link_vf(struct e1000_hw *hw);
static s32 e1000_get_bus_info_pcie_vf(struct e1000_hw *hw);
static s32 e1000_init_mac_params_vf(struct e1000_hw *hw);
static s32 e1000_check_for_link_vf(struct e1000_hw *hw);
static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
                                     u16 *duplex);
static s32 e1000_init_hw_vf(struct e1000_hw *hw);
static s32 e1000_reset_hw_vf(struct e1000_hw *hw);
static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *, u32);
static int  e1000_rar_set_vf(struct e1000_hw *, u8 *, u32);
static s32 e1000_read_mac_addr_vf(struct e1000_hw *);

/**
 *  e1000_init_phy_params_vf - Inits PHY params
 *  @hw: pointer to the HW structure
 *
 *  Doesn't do much - there's no PHY available to the VF.
 **/
static s32 e1000_init_phy_params_vf(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_init_phy_params_vf");
        hw->phy.type = e1000_phy_vf;
        hw->phy.ops.acquire = e1000_acquire_vf;
        hw->phy.ops.release = e1000_release_vf;

        return E1000_SUCCESS;
}

/**
 *  e1000_init_nvm_params_vf - Inits NVM params
 *  @hw: pointer to the HW structure
 *
 *  Doesn't do much - there's no NVM available to the VF.
 **/
static s32 e1000_init_nvm_params_vf(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_init_nvm_params_vf");
        hw->nvm.type = e1000_nvm_none;
        hw->nvm.ops.acquire = e1000_acquire_vf;
        hw->nvm.ops.release = e1000_release_vf;

        return E1000_SUCCESS;
}

/**
 *  e1000_init_mac_params_vf - Inits MAC params
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_mac_params_vf(struct e1000_hw *hw)
{
        struct e1000_mac_info *mac = &hw->mac;

        DEBUGFUNC("e1000_init_mac_params_vf");

        /* Set media type */
        /*
         * Virtual functions don't care what they're media type is as they
         * have no direct access to the PHY, or the media.  That is handled
         * by the physical function driver.
         */
        hw->phy.media_type = e1000_media_type_unknown;

        /* No ASF features for the VF driver */
        mac->asf_firmware_present = false;
        /* ARC subsystem not supported */
        mac->arc_subsystem_valid = false;
        /* Disable adaptive IFS mode so the generic funcs don't do anything */
        mac->adaptive_ifs = false;
        /* VF's have no MTA Registers - PF feature only */
        mac->mta_reg_count = 128;
        /* VF's have no access to RAR entries  */
        mac->rar_entry_count = 1;

        /* Function pointers */
        /* link setup */
        mac->ops.setup_link = e1000_setup_link_vf;
        /* bus type/speed/width */
        mac->ops.get_bus_info = e1000_get_bus_info_pcie_vf;
        /* reset */
        mac->ops.reset_hw = e1000_reset_hw_vf;
        /* hw initialization */
        mac->ops.init_hw = e1000_init_hw_vf;
        /* check for link */
        mac->ops.check_for_link = e1000_check_for_link_vf;
        /* link info */
        mac->ops.get_link_up_info = e1000_get_link_up_info_vf;
        /* multicast address update */
        mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf;
        /* set mac address */
        mac->ops.rar_set = e1000_rar_set_vf;
        /* read mac address */
        mac->ops.read_mac_addr = e1000_read_mac_addr_vf;


        return E1000_SUCCESS;
}

/**
 *  e1000_init_function_pointers_vf - Inits function pointers
 *  @hw: pointer to the HW structure
 **/
void e1000_init_function_pointers_vf(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_init_function_pointers_vf");

        hw->mac.ops.init_params = e1000_init_mac_params_vf;
        hw->nvm.ops.init_params = e1000_init_nvm_params_vf;
        hw->phy.ops.init_params = e1000_init_phy_params_vf;
        hw->mbx.ops.init_params = e1000_init_mbx_params_vf;
}

/**
 *  e1000_acquire_vf - Acquire rights to access PHY or NVM.
 *  @hw: pointer to the HW structure
 *
 *  There is no PHY or NVM so we want all attempts to acquire these to fail.
 *  In addition, the MAC registers to access PHY/NVM don't exist so we don't
 *  even want any SW to attempt to use them.
 **/
static s32 e1000_acquire_vf(struct e1000_hw E1000_UNUSEDARG *hw)
{
        return -E1000_ERR_PHY;
}

/**
 *  e1000_release_vf - Release PHY or NVM
 *  @hw: pointer to the HW structure
 *
 *  There is no PHY or NVM so we want all attempts to acquire these to fail.
 *  In addition, the MAC registers to access PHY/NVM don't exist so we don't
 *  even want any SW to attempt to use them.
 **/
static void e1000_release_vf(struct e1000_hw E1000_UNUSEDARG *hw)
{
        return;
}

/**
 *  e1000_setup_link_vf - Sets up link.
 *  @hw: pointer to the HW structure
 *
 *  Virtual functions cannot change link.
 **/
static s32 e1000_setup_link_vf(struct e1000_hw E1000_UNUSEDARG *hw)
{
        DEBUGFUNC("e1000_setup_link_vf");

        return E1000_SUCCESS;
}

/**
 *  e1000_get_bus_info_pcie_vf - Gets the bus info.
 *  @hw: pointer to the HW structure
 *
 *  Virtual functions are not really on their own bus.
 **/
static s32 e1000_get_bus_info_pcie_vf(struct e1000_hw *hw)
{
        struct e1000_bus_info *bus = &hw->bus;

        DEBUGFUNC("e1000_get_bus_info_pcie_vf");

        /* Do not set type PCI-E because we don't want disable master to run */
        bus->type = e1000_bus_type_reserved;
        bus->speed = e1000_bus_speed_2500;

        return 0;
}

/**
 *  e1000_get_link_up_info_vf - Gets link info.
 *  @hw: pointer to the HW structure
 *  @speed: pointer to 16 bit value to store link speed.
 *  @duplex: pointer to 16 bit value to store duplex.
 *
 *  Since we cannot read the PHY and get accurate link info, we must rely upon
 *  the status register's data which is often stale and inaccurate.
 **/
static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
                                     u16 *duplex)
{
        s32 status;

        DEBUGFUNC("e1000_get_link_up_info_vf");

        status = E1000_READ_REG(hw, E1000_STATUS);
        if (status & E1000_STATUS_SPEED_1000) {
                *speed = SPEED_1000;
                DEBUGOUT("1000 Mbs, ");
        } else if (status & E1000_STATUS_SPEED_100) {
                *speed = SPEED_100;
                DEBUGOUT("100 Mbs, ");
        } else {
                *speed = SPEED_10;
                DEBUGOUT("10 Mbs, ");
        }

        if (status & E1000_STATUS_FD) {
                *duplex = FULL_DUPLEX;
                DEBUGOUT("Full Duplex\n");
        } else {
                *duplex = HALF_DUPLEX;
                DEBUGOUT("Half Duplex\n");
        }

        return E1000_SUCCESS;
}

/**
 *  e1000_reset_hw_vf - Resets the HW
 *  @hw: pointer to the HW structure
 *
 *  VF's provide a function level reset. This is done using bit 26 of ctrl_reg.
 *  This is all the reset we can perform on a VF.
 **/
static s32 e1000_reset_hw_vf(struct e1000_hw *hw)
{
        struct e1000_mbx_info *mbx = &hw->mbx;
        u32 timeout = E1000_VF_INIT_TIMEOUT;
        s32 ret_val = -E1000_ERR_MAC_INIT;
        u32 ctrl, msgbuf[3];
        u8 *addr = (u8 *)(&msgbuf[1]);

        DEBUGFUNC("e1000_reset_hw_vf");

        DEBUGOUT("Issuing a function level reset to MAC\n");
        ctrl = E1000_READ_REG(hw, E1000_CTRL);
        E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);

        /* we cannot reset while the RSTI / RSTD bits are asserted */
        while (!mbx->ops.check_for_rst(hw, 0) && timeout) {
                timeout--;
                usec_delay(5);
        }

        if (timeout) {
                /* mailbox timeout can now become active */
                mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT;

                msgbuf[0] = E1000_VF_RESET;
                mbx->ops.write_posted(hw, msgbuf, 1, 0);

                msec_delay(10);

                /* set our "perm_addr" based on info provided by PF */
                ret_val = mbx->ops.read_posted(hw, msgbuf, 3, 0);
                if (!ret_val) {
                        if (msgbuf[0] == (E1000_VF_RESET |
                            E1000_VT_MSGTYPE_ACK))
                                memcpy(hw->mac.perm_addr, addr, 6);
                        else
                                ret_val = -E1000_ERR_MAC_INIT;
                }
        }

        return ret_val;
}

/**
 *  e1000_init_hw_vf - Inits the HW
 *  @hw: pointer to the HW structure
 *
 *  Not much to do here except clear the PF Reset indication if there is one.
 **/
static s32 e1000_init_hw_vf(struct e1000_hw *hw)
{
        DEBUGFUNC("e1000_init_hw_vf");

        /* attempt to set and restore our mac address */
        e1000_rar_set_vf(hw, hw->mac.addr, 0);

        return E1000_SUCCESS;
}

/**
 *  e1000_rar_set_vf - set device MAC address
 *  @hw: pointer to the HW structure
 *  @addr: pointer to the receive address
 *  @index receive address array register
 **/
static int e1000_rar_set_vf(struct e1000_hw *hw, u8 *addr,
                             u32 E1000_UNUSEDARG index)
{
        struct e1000_mbx_info *mbx = &hw->mbx;
        u32 msgbuf[3];
        u8 *msg_addr = (u8 *)(&msgbuf[1]);
        s32 ret_val;

        memset(msgbuf, 0, 12);
        msgbuf[0] = E1000_VF_SET_MAC_ADDR;
        memcpy(msg_addr, addr, 6);
        ret_val = mbx->ops.write_posted(hw, msgbuf, 3, 0);

        if (!ret_val)
                ret_val = mbx->ops.read_posted(hw, msgbuf, 3, 0);

        msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;

        /* if nacked the address was rejected, use "perm_addr" */
        if (!ret_val &&
            (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK)))
                e1000_read_mac_addr_vf(hw);

        return E1000_SUCCESS;
}

/**
 *  e1000_hash_mc_addr_vf - Generate a multicast hash value
 *  @hw: pointer to the HW structure
 *  @mc_addr: pointer to a multicast address
 *
 *  Generates a multicast address hash value which is used to determine
 *  the multicast filter table array address and new table value.
 **/
static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr)
{
        u32 hash_value, hash_mask;
        u8 bit_shift = 0;

        DEBUGFUNC("e1000_hash_mc_addr_generic");

        /* Register count multiplied by bits per register */
        hash_mask = (hw->mac.mta_reg_count * 32) - 1;

        /*
         * The bit_shift is the number of left-shifts
         * where 0xFF would still fall within the hash mask.
         */
        while (hash_mask >> bit_shift != 0xFF)
                bit_shift++;

        hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
                                  (((u16) mc_addr[5]) << bit_shift)));

        return hash_value;
}

static void e1000_write_msg_read_ack(struct e1000_hw *hw,
                                     u32 *msg, u16 size)
{
        struct e1000_mbx_info *mbx = &hw->mbx;
        u32 retmsg[E1000_VFMAILBOX_SIZE];
        s32 retval = mbx->ops.write_posted(hw, msg, size, 0);

        if (!retval)
                mbx->ops.read_posted(hw, retmsg, E1000_VFMAILBOX_SIZE, 0);
}

/**
 *  e1000_update_mc_addr_list_vf - Update Multicast addresses
 *  @hw: pointer to the HW structure
 *  @mc_addr_list: array of multicast addresses to program
 *  @mc_addr_count: number of multicast addresses to program
 *
 *  Updates the Multicast Table Array.
 *  The caller must have a packed mc_addr_list of multicast addresses.
 **/
void e1000_update_mc_addr_list_vf(struct e1000_hw *hw,
                                  u8 *mc_addr_list, u32 mc_addr_count)
{
        u32 msgbuf[E1000_VFMAILBOX_SIZE];
        u16 *hash_list = (u16 *)&msgbuf[1];
        u32 hash_value;
        u32 i;

        DEBUGFUNC("e1000_update_mc_addr_list_vf");

        /* 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.
         */

        DEBUGOUT1("MC Addr Count = %d\n", mc_addr_count);

        msgbuf[0] = E1000_VF_SET_MULTICAST;

        if (mc_addr_count > 30) {
                msgbuf[0] |= E1000_VF_SET_MULTICAST_OVERFLOW;
                mc_addr_count = 30;
        }

        msgbuf[0] |= mc_addr_count << E1000_VT_MSGINFO_SHIFT;

        for (i = 0; i < mc_addr_count; i++) {
                hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list);
                DEBUGOUT1("Hash value = 0x%03X\n", hash_value);
                hash_list[i] = hash_value & 0x0FFF;
                mc_addr_list += ETHER_ADDR_LEN;
        }

        e1000_write_msg_read_ack(hw, msgbuf, E1000_VFMAILBOX_SIZE);
}

/**
 *  e1000_vfta_set_vf - Set/Unset vlan filter table address
 *  @hw: pointer to the HW structure
 *  @vid: determines the vfta register and bit to set/unset
 *  @set: if true then set bit, else clear bit
 **/
void e1000_vfta_set_vf(struct e1000_hw *hw, u16 vid, bool set)
{
        u32 msgbuf[2];

        msgbuf[0] = E1000_VF_SET_VLAN;
        msgbuf[1] = vid;
        /* Setting the 8 bit field MSG INFO to true indicates "add" */
        if (set)
                msgbuf[0] |= E1000_VF_SET_VLAN_ADD;

        e1000_write_msg_read_ack(hw, msgbuf, 2);
}

/** e1000_rlpml_set_vf - Set the maximum receive packet length
 *  @hw: pointer to the HW structure
 *  @max_size: value to assign to max frame size
 **/
void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size)
{
        u32 msgbuf[2];

        msgbuf[0] = E1000_VF_SET_LPE;
        msgbuf[1] = max_size;

        e1000_write_msg_read_ack(hw, msgbuf, 2);
}

/**
 *  e1000_promisc_set_vf - Set flags for Unicast or Multicast promisc
 *  @hw: pointer to the HW structure
 *  @uni: boolean indicating unicast promisc status
 *  @multi: boolean indicating multicast promisc status
 **/
s32 e1000_promisc_set_vf(struct e1000_hw *hw, enum e1000_promisc_type type)
{
        struct e1000_mbx_info *mbx = &hw->mbx;
        u32 msgbuf = E1000_VF_SET_PROMISC;
        s32 ret_val;

        switch (type) {
        case e1000_promisc_multicast:
                msgbuf |= E1000_VF_SET_PROMISC_MULTICAST;
                break;
        case e1000_promisc_enabled:
                msgbuf |= E1000_VF_SET_PROMISC_MULTICAST;
                /* FALLTHROUGH */
        case e1000_promisc_unicast:
                msgbuf |= E1000_VF_SET_PROMISC_UNICAST;
                /* FALLTHROUGH */
        case e1000_promisc_disabled:
                break;
        default:
                return -E1000_ERR_MAC_INIT;
        }

         ret_val = mbx->ops.write_posted(hw, &msgbuf, 1, 0);

        if (!ret_val)
                ret_val = mbx->ops.read_posted(hw, &msgbuf, 1, 0);

        if (!ret_val && !(msgbuf & E1000_VT_MSGTYPE_ACK))
                ret_val = -E1000_ERR_MAC_INIT;

        return ret_val;
}

/**
 *  e1000_read_mac_addr_vf - Read device MAC address
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw)
{
        int i;

        for (i = 0; i < ETHER_ADDR_LEN; i++)
                hw->mac.addr[i] = hw->mac.perm_addr[i];

        return E1000_SUCCESS;
}

/**
 *  e1000_check_for_link_vf - Check for link for a virtual interface
 *  @hw: pointer to the HW structure
 *
 *  Checks to see if the underlying PF is still talking to the VF and
 *  if it is then it reports the link state to the hardware, otherwise
 *  it reports link down and returns an error.
 **/
static s32 e1000_check_for_link_vf(struct e1000_hw *hw)
{
        struct e1000_mbx_info *mbx = &hw->mbx;
        struct e1000_mac_info *mac = &hw->mac;
        s32 ret_val = E1000_SUCCESS;
        u32 in_msg = 0;

        DEBUGFUNC("e1000_check_for_link_vf");

        /*
         * We only want to run this if there has been a rst asserted.
         * in this case that could mean a link change, device reset,
         * or a virtual function reset
         */

        /* If we were hit with a reset or timeout drop the link */
        if (!mbx->ops.check_for_rst(hw, 0) || !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 */
        if (!(E1000_READ_REG(hw, E1000_STATUS) & E1000_STATUS_LU))
                goto out;

        /* 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, 0))
                goto out;

        /* if incoming message isn't clear to send we are waiting on response */
        if (!(in_msg & E1000_VT_MSGTYPE_CTS)) {
                /* message is not CTS and is NACK we have lost CTS status */
                if (in_msg & E1000_VT_MSGTYPE_NACK)
                        ret_val = -E1000_ERR_MAC_INIT;
                goto out;
        }

        /* at this point we know the PF is talking to us, check and see if
         * we are still accepting timeout or if we had a timeout failure.
         * if we failed then we will need to reinit */
        if (!mbx->timeout) {
                ret_val = -E1000_ERR_MAC_INIT;
                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:
        return ret_val;
}