Contributors: 16
Author Tokens Token Proportion Commits Commit Proportion
Greg Rose 1255 36.42% 7 15.22%
K. Y. Srinivasan 647 18.78% 1 2.17%
Alexander Duyck 613 17.79% 7 15.22%
Vladislav Zolotarov 389 11.29% 2 4.35%
Emil Tantilov 150 4.35% 7 15.22%
Tony Nguyen 136 3.95% 6 13.04%
Hiroshi Shimamoto 105 3.05% 1 2.17%
Donald Skidmore 62 1.80% 2 4.35%
Jiri Pirko 38 1.10% 2 4.35%
Jeff Kirsher 14 0.41% 3 6.52%
Shannon Nelson 12 0.35% 1 2.17%
John Fastabend 10 0.29% 2 4.35%
Colin Ian King 7 0.20% 1 2.17%
Stephen Hemminger 6 0.17% 2 4.35%
Joe Perches 1 0.03% 1 2.17%
Ben Hutchings 1 0.03% 1 2.17%
Total 3446 46 


// 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;
}

/**
 * Hyper-V variant; the VF/PF communication is through the PCI
 * config space.
 * @hw: pointer to private hardware struct
 */
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;
		/* fall through */
	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;
		/* fall through */
	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);
	}

	ixgbevf_write_msg_read_ack(hw, msgbuf, msgbuf, IXGBE_VFMAILBOX_SIZE);

	return 0;
}

/**
 * Hyper-V variant - just a stub.
 * @hw: unused
 * @netdev: unused
 */
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;
		/* Fall threw */
	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;
}

/**
 * Hyper-V variant - just a stub.
 * @hw: unused
 * @xcast_mode: unused
 */
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;
}

/**
 * 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;
}

/**
 * Hyper-V variant; there is no mailbox communication.
 * @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
 */
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,
};