NetBSD/sys/dev/pci/ixgbe/if_sriov.c

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

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  All rights reserved.

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

   1. Redistributions of source code must retain the above copyright notice,
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      notice, this list of conditions and the following disclaimer in the
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      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

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  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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******************************************************************************/
/*$FreeBSD: head/sys/dev/ixgbe/if_sriov.c 327031 2017-12-20 18:15:06Z erj $*/

#include "ixgbe.h"
#include "ixgbe_sriov.h"

#ifdef PCI_IOV

MALLOC_DEFINE(M_IXGBE_SRIOV, "ix_sriov", "ix SR-IOV allocations");

/************************************************************************
 * ixgbe_pci_iov_detach
 ************************************************************************/
int
ixgbe_pci_iov_detach(device_t dev)
{
	return pci_iov_detach(dev);
}

/************************************************************************
 * ixgbe_define_iov_schemas
 ************************************************************************/
void
ixgbe_define_iov_schemas(device_t dev, int *error)
{
	nvlist_t *pf_schema, *vf_schema;

	pf_schema = pci_iov_schema_alloc_node();
	vf_schema = pci_iov_schema_alloc_node();
	pci_iov_schema_add_unicast_mac(vf_schema, "mac-addr", 0, NULL);
	pci_iov_schema_add_bool(vf_schema, "mac-anti-spoof",
	    IOV_SCHEMA_HASDEFAULT, TRUE);
	pci_iov_schema_add_bool(vf_schema, "allow-set-mac",
	    IOV_SCHEMA_HASDEFAULT, FALSE);
	pci_iov_schema_add_bool(vf_schema, "allow-promisc",
	    IOV_SCHEMA_HASDEFAULT, FALSE);
	*error = pci_iov_attach(dev, pf_schema, vf_schema);
	if (*error != 0) {
		device_printf(dev,
		    "Error %d setting up SR-IOV\n", *error);
	}
} /* ixgbe_define_iov_schemas */

/************************************************************************
 * ixgbe_align_all_queue_indices
 ************************************************************************/
inline void
ixgbe_align_all_queue_indices(struct adapter *adapter)
{
	int i;
	int index;

	for (i = 0; i < adapter->num_queues; i++) {
		index = ixgbe_vf_que_index(adapter->iov_mode, adapter->pool, i);
		adapter->rx_rings[i].me = index;
		adapter->tx_rings[i].me = index;
	}
}

/* Support functions for SR-IOV/VF management */
static inline void
ixgbe_send_vf_msg(struct adapter *adapter, struct ixgbe_vf *vf, u32 msg)
{
	if (vf->flags & IXGBE_VF_CTS)
		msg |= IXGBE_VT_MSGTYPE_CTS;

	adapter->hw.mbx.ops.write(&adapter->hw, &msg, 1, vf->pool);
}

static inline void
ixgbe_send_vf_ack(struct adapter *adapter, struct ixgbe_vf *vf, u32 msg)
{
	msg &= IXGBE_VT_MSG_MASK;
	ixgbe_send_vf_msg(adapter, vf, msg | IXGBE_VT_MSGTYPE_ACK);
}

static inline void
ixgbe_send_vf_nack(struct adapter *adapter, struct ixgbe_vf *vf, u32 msg)
{
	msg &= IXGBE_VT_MSG_MASK;
	ixgbe_send_vf_msg(adapter, vf, msg | IXGBE_VT_MSGTYPE_NACK);
}

static inline void
ixgbe_process_vf_ack(struct adapter *adapter, struct ixgbe_vf *vf)
{
	if (!(vf->flags & IXGBE_VF_CTS))
		ixgbe_send_vf_nack(adapter, vf, 0);
}

static inline boolean_t
ixgbe_vf_mac_changed(struct ixgbe_vf *vf, const uint8_t *mac)
{
	return (bcmp(mac, vf->ether_addr, ETHER_ADDR_LEN) != 0);
}

static inline int
ixgbe_vf_queues(int mode)
{
	switch (mode) {
	case IXGBE_64_VM:
		return (2);
	case IXGBE_32_VM:
		return (4);
	case IXGBE_NO_VM:
	default:
		return (0);
	}
}

inline int
ixgbe_vf_que_index(int mode, int vfnum, int num)
{
	return ((vfnum * ixgbe_vf_queues(mode)) + num);
}

static inline void
ixgbe_update_max_frame(struct adapter * adapter, int max_frame)
{
	if (adapter->max_frame_size < max_frame)
		adapter->max_frame_size = max_frame;
}

inline u32
ixgbe_get_mrqc(int iov_mode)
{
	u32 mrqc;

	switch (iov_mode) {
	case IXGBE_64_VM:
		mrqc = IXGBE_MRQC_VMDQRSS64EN;
		break;
	case IXGBE_32_VM:
		mrqc = IXGBE_MRQC_VMDQRSS32EN;
		break;
	case IXGBE_NO_VM:
		mrqc = 0;
		break;
	default:
		panic("Unexpected SR-IOV mode %d", iov_mode);
	}

	return mrqc;
}


inline u32
ixgbe_get_mtqc(int iov_mode)
{
	uint32_t mtqc;

	switch (iov_mode) {
	case IXGBE_64_VM:
		mtqc = IXGBE_MTQC_64VF | IXGBE_MTQC_VT_ENA;
		break;
	case IXGBE_32_VM:
		mtqc = IXGBE_MTQC_32VF | IXGBE_MTQC_VT_ENA;
		break;
	case IXGBE_NO_VM:
		mtqc = IXGBE_MTQC_64Q_1PB;
		break;
	default:
		panic("Unexpected SR-IOV mode %d", iov_mode);
	}

	return mtqc;
}

void
ixgbe_ping_all_vfs(struct adapter *adapter)
{
	struct ixgbe_vf *vf;

	for (int i = 0; i < adapter->num_vfs; i++) {
		vf = &adapter->vfs[i];
		if (vf->flags & IXGBE_VF_ACTIVE)
			ixgbe_send_vf_msg(adapter, vf, IXGBE_PF_CONTROL_MSG);
	}
} /* ixgbe_ping_all_vfs */


static void
ixgbe_vf_set_default_vlan(struct adapter *adapter, struct ixgbe_vf *vf,
                          uint16_t tag)
{
	struct ixgbe_hw *hw;
	uint32_t vmolr, vmvir;

	hw = &adapter->hw;

	vf->vlan_tag = tag;

	vmolr = IXGBE_READ_REG(hw, IXGBE_VMOLR(vf->pool));

	/* Do not receive packets that pass inexact filters. */
	vmolr &= ~(IXGBE_VMOLR_ROMPE | IXGBE_VMOLR_ROPE);

	/* Disable Multicast Promicuous Mode. */
	vmolr &= ~IXGBE_VMOLR_MPE;

	/* Accept broadcasts. */
	vmolr |= IXGBE_VMOLR_BAM;

	if (tag == 0) {
		/* Accept non-vlan tagged traffic. */
		vmolr |= IXGBE_VMOLR_AUPE;

		/* Allow VM to tag outgoing traffic; no default tag. */
		vmvir = 0;
	} else {
		/* Require vlan-tagged traffic. */
		vmolr &= ~IXGBE_VMOLR_AUPE;

		/* Tag all traffic with provided vlan tag. */
		vmvir = (tag | IXGBE_VMVIR_VLANA_DEFAULT);
	}
	IXGBE_WRITE_REG(hw, IXGBE_VMOLR(vf->pool), vmolr);
	IXGBE_WRITE_REG(hw, IXGBE_VMVIR(vf->pool), vmvir);
} /* ixgbe_vf_set_default_vlan */


static void
ixgbe_clear_vfmbmem(struct ixgbe_hw *hw, struct ixgbe_vf *vf)
{
	uint32_t vf_index = IXGBE_VF_INDEX(vf->pool);
	uint16_t mbx_size = hw->mbx.size;
	uint16_t i;

	IXGBE_CORE_LOCK_ASSERT(adapter);

	for (i = 0; i < mbx_size; ++i)
		IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_index), i, 0x0);
} /* ixgbe_clear_vfmbmem */


static void
ixgbe_toggle_txdctl(struct ixgbe_hw *hw, struct ixgbe_vf *vf)
{
	uint32_t vf_index, offset, reg;
	uint8_t  queue_count, i;

	IXGBE_CORE_LOCK_ASSERT(adapter);

	vf_index = IXGBE_VF_INDEX(vf->pool);

	/* Determine number of queues by checking
	 * number of virtual functions */
	reg = IXGBE_READ_REG(hw, IXGBE_GCR_EXT);
	switch (reg & IXGBE_GCR_EXT_VT_MODE_MASK) {
	case IXGBE_GCR_EXT_VT_MODE_64:
		queue_count = 2;
		break;
	case IXGBE_GCR_EXT_VT_MODE_32:
		queue_count = 4;
		break;
	default:
		return;
	}

	/* Toggle queues */
	for (i = 0; i < queue_count; ++i) {
		/* Calculate offset of current queue */
		offset = queue_count * vf_index + i;

		/* Enable queue */
		reg = IXGBE_READ_REG(hw, IXGBE_PVFTXDCTL(offset));
		reg |= IXGBE_TXDCTL_ENABLE;
		IXGBE_WRITE_REG(hw, IXGBE_PVFTXDCTL(offset), reg);
		IXGBE_WRITE_FLUSH(hw);

		/* Disable queue */
		reg = IXGBE_READ_REG(hw, IXGBE_PVFTXDCTL(offset));
		reg &= ~IXGBE_TXDCTL_ENABLE;
		IXGBE_WRITE_REG(hw, IXGBE_PVFTXDCTL(offset), reg);
		IXGBE_WRITE_FLUSH(hw);
	}
} /* ixgbe_toggle_txdctl */


static boolean_t
ixgbe_vf_frame_size_compatible(struct adapter *adapter, struct ixgbe_vf *vf)
{

	/*
	 * Frame size compatibility between PF and VF is only a problem on
	 * 82599-based cards.  X540 and later support any combination of jumbo
	 * frames on PFs and VFs.
	 */
	if (adapter->hw.mac.type != ixgbe_mac_82599EB)
		return (TRUE);

	switch (vf->api_ver) {
	case IXGBE_API_VER_1_0:
	case IXGBE_API_VER_UNKNOWN:
		/*
		 * On legacy (1.0 and older) VF versions, we don't support jumbo
		 * frames on either the PF or the VF.
		 */
		if (adapter->max_frame_size > ETHER_MAX_LEN ||
		    vf->max_frame_size > ETHER_MAX_LEN)
			return (FALSE);

		return (TRUE);

		break;
	case IXGBE_API_VER_1_1:
	default:
		/*
		 * 1.1 or later VF versions always work if they aren't using
		 * jumbo frames.
		 */
		if (vf->max_frame_size <= ETHER_MAX_LEN)
			return (TRUE);

		/*
		 * Jumbo frames only work with VFs if the PF is also using jumbo
		 * frames.
		 */
		if (adapter->max_frame_size <= ETHER_MAX_LEN)
			return (TRUE);

		return (FALSE);
	}
} /* ixgbe_vf_frame_size_compatible */


static void
ixgbe_process_vf_reset(struct adapter *adapter, struct ixgbe_vf *vf)
{
	ixgbe_vf_set_default_vlan(adapter, vf, vf->default_vlan);

	// XXX clear multicast addresses

	ixgbe_clear_rar(&adapter->hw, vf->rar_index);
	ixgbe_clear_vfmbmem(&adapter->hw, vf);
	ixgbe_toggle_txdctl(&adapter->hw, vf);

	vf->api_ver = IXGBE_API_VER_UNKNOWN;
} /* ixgbe_process_vf_reset */


static void
ixgbe_vf_enable_transmit(struct adapter *adapter, struct ixgbe_vf *vf)
{
	struct ixgbe_hw *hw;
	uint32_t vf_index, vfte;

	hw = &adapter->hw;

	vf_index = IXGBE_VF_INDEX(vf->pool);
	vfte = IXGBE_READ_REG(hw, IXGBE_VFTE(vf_index));
	vfte |= IXGBE_VF_BIT(vf->pool);
	IXGBE_WRITE_REG(hw, IXGBE_VFTE(vf_index), vfte);
} /* ixgbe_vf_enable_transmit */


static void
ixgbe_vf_enable_receive(struct adapter *adapter, struct ixgbe_vf *vf)
{
	struct ixgbe_hw *hw;
	uint32_t vf_index, vfre;

	hw = &adapter->hw;

	vf_index = IXGBE_VF_INDEX(vf->pool);
	vfre = IXGBE_READ_REG(hw, IXGBE_VFRE(vf_index));
	if (ixgbe_vf_frame_size_compatible(adapter, vf))
		vfre |= IXGBE_VF_BIT(vf->pool);
	else
		vfre &= ~IXGBE_VF_BIT(vf->pool);
	IXGBE_WRITE_REG(hw, IXGBE_VFRE(vf_index), vfre);
} /* ixgbe_vf_enable_receive */


static void
ixgbe_vf_reset_msg(struct adapter *adapter, struct ixgbe_vf *vf, uint32_t *msg)
{
	struct ixgbe_hw *hw;
	uint32_t ack;
	uint32_t resp[IXGBE_VF_PERMADDR_MSG_LEN];

	hw = &adapter->hw;

	ixgbe_process_vf_reset(adapter, vf);

	if (ixgbe_validate_mac_addr(vf->ether_addr) == 0) {
		ixgbe_set_rar(&adapter->hw, vf->rar_index, vf->ether_addr,
		    vf->pool, TRUE);
		ack = IXGBE_VT_MSGTYPE_ACK;
	} else
		ack = IXGBE_VT_MSGTYPE_NACK;

	ixgbe_vf_enable_transmit(adapter, vf);
	ixgbe_vf_enable_receive(adapter, vf);

	vf->flags |= IXGBE_VF_CTS;

	resp[0] = IXGBE_VF_RESET | ack;
	bcopy(vf->ether_addr, &resp[1], ETHER_ADDR_LEN);
	resp[3] = hw->mac.mc_filter_type;
	hw->mbx.ops.write(hw, resp, IXGBE_VF_PERMADDR_MSG_LEN, vf->pool);
} /* ixgbe_vf_reset_msg */


static void
ixgbe_vf_set_mac(struct adapter *adapter, struct ixgbe_vf *vf, uint32_t *msg)
{
	uint8_t *mac;

	mac = (uint8_t*)&msg[1];

	/* Check that the VF has permission to change the MAC address. */
	if (!(vf->flags & IXGBE_VF_CAP_MAC) && ixgbe_vf_mac_changed(vf, mac)) {
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		return;
	}

	if (ixgbe_validate_mac_addr(mac) != 0) {
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		return;
	}

	bcopy(mac, vf->ether_addr, ETHER_ADDR_LEN);

	ixgbe_set_rar(&adapter->hw, vf->rar_index, vf->ether_addr, vf->pool,
	    TRUE);

	ixgbe_send_vf_ack(adapter, vf, msg[0]);
} /* ixgbe_vf_set_mac */


/*
 * VF multicast addresses are set by using the appropriate bit in
 * 1 of 128 32 bit addresses (4096 possible).
 */
static void
ixgbe_vf_set_mc_addr(struct adapter *adapter, struct ixgbe_vf *vf, u32 *msg)
{
	u16	*list = (u16*)&msg[1];
	int	entries;
	u32	vmolr, vec_bit, vec_reg, mta_reg;

	entries = (msg[0] & IXGBE_VT_MSGINFO_MASK) >> IXGBE_VT_MSGINFO_SHIFT;
	entries = uimin(entries, IXGBE_MAX_VF_MC);

	vmolr = IXGBE_READ_REG(&adapter->hw, IXGBE_VMOLR(vf->pool));

	vf->num_mc_hashes = entries;

	/* Set the appropriate MTA bit */
	for (int i = 0; i < entries; i++) {
		vf->mc_hash[i] = list[i];
		vec_reg = (vf->mc_hash[i] >> 5) & 0x7F;
		vec_bit = vf->mc_hash[i] & 0x1F;
		mta_reg = IXGBE_READ_REG(&adapter->hw, IXGBE_MTA(vec_reg));
		mta_reg |= (1 << vec_bit);
		IXGBE_WRITE_REG(&adapter->hw, IXGBE_MTA(vec_reg), mta_reg);
	}

	vmolr |= IXGBE_VMOLR_ROMPE;
	IXGBE_WRITE_REG(&adapter->hw, IXGBE_VMOLR(vf->pool), vmolr);
	ixgbe_send_vf_ack(adapter, vf, msg[0]);
} /* ixgbe_vf_set_mc_addr */


static void
ixgbe_vf_set_vlan(struct adapter *adapter, struct ixgbe_vf *vf, uint32_t *msg)
{
	struct ixgbe_hw *hw;
	int enable;
	uint16_t tag;

	hw = &adapter->hw;
	enable = IXGBE_VT_MSGINFO(msg[0]);
	tag = msg[1] & IXGBE_VLVF_VLANID_MASK;

	if (!(vf->flags & IXGBE_VF_CAP_VLAN)) {
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		return;
	}

	/* It is illegal to enable vlan tag 0. */
	if (tag == 0 && enable != 0) {
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		return;
	}

	ixgbe_set_vfta(hw, tag, vf->pool, enable, false);
	ixgbe_send_vf_ack(adapter, vf, msg[0]);
} /* ixgbe_vf_set_vlan */


static void
ixgbe_vf_set_lpe(struct adapter *adapter, struct ixgbe_vf *vf, uint32_t *msg)
{
	struct ixgbe_hw *hw;
	uint32_t vf_max_size, pf_max_size, mhadd;

	hw = &adapter->hw;
	vf_max_size = msg[1];

	if (vf_max_size < ETHER_CRC_LEN) {
		/* We intentionally ACK invalid LPE requests. */
		ixgbe_send_vf_ack(adapter, vf, msg[0]);
		return;
	}

	vf_max_size -= ETHER_CRC_LEN;

	if (vf_max_size > IXGBE_MAX_FRAME_SIZE) {
		/* We intentionally ACK invalid LPE requests. */
		ixgbe_send_vf_ack(adapter, vf, msg[0]);
		return;
	}

	vf->max_frame_size = vf_max_size;
	ixgbe_update_max_frame(adapter, vf->max_frame_size);

	/*
	 * We might have to disable reception to this VF if the frame size is
	 * not compatible with the config on the PF.
	 */
	ixgbe_vf_enable_receive(adapter, vf);

	mhadd = IXGBE_READ_REG(hw, IXGBE_MHADD);
	pf_max_size = (mhadd & IXGBE_MHADD_MFS_MASK) >> IXGBE_MHADD_MFS_SHIFT;

	if (pf_max_size < adapter->max_frame_size) {
		mhadd &= ~IXGBE_MHADD_MFS_MASK;
		mhadd |= adapter->max_frame_size << IXGBE_MHADD_MFS_SHIFT;
		IXGBE_WRITE_REG(hw, IXGBE_MHADD, mhadd);
	}

	ixgbe_send_vf_ack(adapter, vf, msg[0]);
} /* ixgbe_vf_set_lpe */


static void
ixgbe_vf_set_macvlan(struct adapter *adapter, struct ixgbe_vf *vf,
                     uint32_t *msg)
{
	//XXX implement this
	ixgbe_send_vf_nack(adapter, vf, msg[0]);
} /* ixgbe_vf_set_macvlan */


static void
ixgbe_vf_api_negotiate(struct adapter *adapter, struct ixgbe_vf *vf,
    uint32_t *msg)
{

	switch (msg[1]) {
	case IXGBE_API_VER_1_0:
	case IXGBE_API_VER_1_1:
		vf->api_ver = msg[1];
		ixgbe_send_vf_ack(adapter, vf, msg[0]);
		break;
	default:
		vf->api_ver = IXGBE_API_VER_UNKNOWN;
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		break;
	}
} /* ixgbe_vf_api_negotiate */


static void
ixgbe_vf_get_queues(struct adapter *adapter, struct ixgbe_vf *vf, uint32_t *msg)
{
	struct ixgbe_hw *hw;
	uint32_t resp[IXGBE_VF_GET_QUEUES_RESP_LEN];
	int num_queues;

	hw = &adapter->hw;

	/* GET_QUEUES is not supported on pre-1.1 APIs. */
	switch (msg[0]) {
	case IXGBE_API_VER_1_0:
	case IXGBE_API_VER_UNKNOWN:
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		return;
	}

	resp[0] = IXGBE_VF_GET_QUEUES | IXGBE_VT_MSGTYPE_ACK |
	    IXGBE_VT_MSGTYPE_CTS;

	num_queues = ixgbe_vf_queues(adapter->iov_mode);
	resp[IXGBE_VF_TX_QUEUES] = num_queues;
	resp[IXGBE_VF_RX_QUEUES] = num_queues;
	resp[IXGBE_VF_TRANS_VLAN] = (vf->default_vlan != 0);
	resp[IXGBE_VF_DEF_QUEUE] = 0;

	hw->mbx.ops.write(hw, resp, IXGBE_VF_GET_QUEUES_RESP_LEN, vf->pool);
} /* ixgbe_vf_get_queues */


static void
ixgbe_process_vf_msg(struct adapter *adapter, struct ixgbe_vf *vf)
{
	struct ixgbe_hw *hw;
	uint32_t msg[IXGBE_VFMAILBOX_SIZE];
	int error;

	hw = &adapter->hw;

	error = hw->mbx.ops.read(hw, msg, IXGBE_VFMAILBOX_SIZE, vf->pool);

	if (error != 0)
		return;

	CTR3(KTR_MALLOC, "%s: received msg %x from %d", adapter->ifp->if_xname,
	    msg[0], vf->pool);
	if (msg[0] == IXGBE_VF_RESET) {
		ixgbe_vf_reset_msg(adapter, vf, msg);
		return;
	}

	if (!(vf->flags & IXGBE_VF_CTS)) {
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
		return;
	}

	switch (msg[0] & IXGBE_VT_MSG_MASK) {
	case IXGBE_VF_SET_MAC_ADDR:
		ixgbe_vf_set_mac(adapter, vf, msg);
		break;
	case IXGBE_VF_SET_MULTICAST:
		ixgbe_vf_set_mc_addr(adapter, vf, msg);
		break;
	case IXGBE_VF_SET_VLAN:
		ixgbe_vf_set_vlan(adapter, vf, msg);
		break;
	case IXGBE_VF_SET_LPE:
		ixgbe_vf_set_lpe(adapter, vf, msg);
		break;
	case IXGBE_VF_SET_MACVLAN:
		ixgbe_vf_set_macvlan(adapter, vf, msg);
		break;
	case IXGBE_VF_API_NEGOTIATE:
		ixgbe_vf_api_negotiate(adapter, vf, msg);
		break;
	case IXGBE_VF_GET_QUEUES:
		ixgbe_vf_get_queues(adapter, vf, msg);
		break;
	default:
		ixgbe_send_vf_nack(adapter, vf, msg[0]);
	}
} /* ixgbe_process_vf_msg */


/* Tasklet for handling VF -> PF mailbox messages */
void
ixgbe_handle_mbx(void *context, int pending)
{
	struct adapter *adapter = context;
	struct ixgbe_hw *hw;
	struct ixgbe_vf *vf;
	int i;

	hw = &adapter->hw;

	IXGBE_CORE_LOCK(adapter);
	for (i = 0; i < adapter->num_vfs; i++) {
		vf = &adapter->vfs[i];

		if (vf->flags & IXGBE_VF_ACTIVE) {
			if (hw->mbx.ops.check_for_rst(hw, vf->pool) == 0)
				ixgbe_process_vf_reset(adapter, vf);

			if (hw->mbx.ops.check_for_msg(hw, vf->pool) == 0)
				ixgbe_process_vf_msg(adapter, vf);

			if (hw->mbx.ops.check_for_ack(hw, vf->pool) == 0)
				ixgbe_process_vf_ack(adapter, vf);
		}
	}
	IXGBE_CORE_UNLOCK(adapter);
} /* ixgbe_handle_mbx */

int
ixgbe_init_iov(device_t dev, u16 num_vfs, const nvlist_t *config)
{
	struct adapter *adapter;
	int retval = 0;

	adapter = device_get_softc(dev);
	adapter->iov_mode = IXGBE_NO_VM;

	if (num_vfs == 0) {
		/* Would we ever get num_vfs = 0? */
		retval = EINVAL;
		goto err_init_iov;
	}

	/*
	 * We've got to reserve a VM's worth of queues for the PF,
	 * thus we go into "64 VF mode" if 32+ VFs are requested.
	 * With 64 VFs, you can only have two queues per VF.
	 * With 32 VFs, you can have up to four queues per VF.
	 */
	if (num_vfs >= IXGBE_32_VM)
		adapter->iov_mode = IXGBE_64_VM;
	else
		adapter->iov_mode = IXGBE_32_VM;

	/* Again, reserving 1 VM's worth of queues for the PF */
	adapter->pool = adapter->iov_mode - 1;

	if ((num_vfs > adapter->pool) || (num_vfs >= IXGBE_64_VM)) {
		retval = ENOSPC;
		goto err_init_iov;
	}

	IXGBE_CORE_LOCK(adapter);

	adapter->vfs = malloc(sizeof(*adapter->vfs) * num_vfs, M_IXGBE_SRIOV,
	    M_NOWAIT | M_ZERO);

	if (adapter->vfs == NULL) {
		retval = ENOMEM;
		IXGBE_CORE_UNLOCK(adapter);
		goto err_init_iov;
	}

	adapter->num_vfs = num_vfs;

	/* set the SRIOV flag now as it's needed
	 * by ixgbe_init_locked() */
	adapter->feat_en |= IXGBE_FEATURE_SRIOV;
	adapter->init_locked(adapter);

	IXGBE_CORE_UNLOCK(adapter);

	return (retval);

err_init_iov:
	adapter->num_vfs = 0;
	adapter->pool = 0;
	adapter->iov_mode = IXGBE_NO_VM;

	return (retval);
} /* ixgbe_init_iov */

void
ixgbe_uninit_iov(device_t dev)
{
	struct ixgbe_hw *hw;
	struct adapter *adapter;
	uint32_t pf_reg, vf_reg;

	adapter = device_get_softc(dev);
	hw = &adapter->hw;

	IXGBE_CORE_LOCK(adapter);

	/* Enable rx/tx for the PF and disable it for all VFs. */
	pf_reg = IXGBE_VF_INDEX(adapter->pool);
	IXGBE_WRITE_REG(hw, IXGBE_VFRE(pf_reg), IXGBE_VF_BIT(adapter->pool));
	IXGBE_WRITE_REG(hw, IXGBE_VFTE(pf_reg), IXGBE_VF_BIT(adapter->pool));

	if (pf_reg == 0)
		vf_reg = 1;
	else
		vf_reg = 0;
	IXGBE_WRITE_REG(hw, IXGBE_VFRE(vf_reg), 0);
	IXGBE_WRITE_REG(hw, IXGBE_VFTE(vf_reg), 0);

	IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, 0);

	free(adapter->vfs, M_IXGBE_SRIOV);
	adapter->vfs = NULL;
	adapter->num_vfs = 0;
	adapter->feat_en &= ~IXGBE_FEATURE_SRIOV;

	IXGBE_CORE_UNLOCK(adapter);
} /* ixgbe_uninit_iov */

static void
ixgbe_init_vf(struct adapter *adapter, struct ixgbe_vf *vf)
{
	struct ixgbe_hw *hw;
	uint32_t vf_index, pfmbimr;

	IXGBE_CORE_LOCK_ASSERT(adapter);

	hw = &adapter->hw;

	if (!(vf->flags & IXGBE_VF_ACTIVE))
		return;

	vf_index = IXGBE_VF_INDEX(vf->pool);
	pfmbimr = IXGBE_READ_REG(hw, IXGBE_PFMBIMR(vf_index));
	pfmbimr |= IXGBE_VF_BIT(vf->pool);
	IXGBE_WRITE_REG(hw, IXGBE_PFMBIMR(vf_index), pfmbimr);

	ixgbe_vf_set_default_vlan(adapter, vf, vf->vlan_tag);

	// XXX multicast addresses

	if (ixgbe_validate_mac_addr(vf->ether_addr) == 0) {
		ixgbe_set_rar(&adapter->hw, vf->rar_index,
		    vf->ether_addr, vf->pool, TRUE);
	}

	ixgbe_vf_enable_transmit(adapter, vf);
	ixgbe_vf_enable_receive(adapter, vf);

	ixgbe_send_vf_msg(adapter, vf, IXGBE_PF_CONTROL_MSG);
} /* ixgbe_init_vf */

void
ixgbe_initialize_iov(struct adapter *adapter)
{
	struct ixgbe_hw *hw = &adapter->hw;
	uint32_t mrqc, mtqc, vt_ctl, vf_reg, gcr_ext, gpie;
	int i;

	if (adapter->iov_mode == IXGBE_NO_VM)
		return;

	IXGBE_CORE_LOCK_ASSERT(adapter);

	/* RMW appropriate registers based on IOV mode */
	/* Read... */
	mrqc    = IXGBE_READ_REG(hw, IXGBE_MRQC);
	gcr_ext = IXGBE_READ_REG(hw, IXGBE_GCR_EXT);
	gpie    = IXGBE_READ_REG(hw, IXGBE_GPIE);
	/* Modify... */
	mrqc    &= ~IXGBE_MRQC_MRQE_MASK;
	mtqc     =  IXGBE_MTQC_VT_ENA;      /* No initial MTQC read needed */
	gcr_ext |=  IXGBE_GCR_EXT_MSIX_EN;
	gcr_ext &= ~IXGBE_GCR_EXT_VT_MODE_MASK;
	gpie    &= ~IXGBE_GPIE_VTMODE_MASK;
	switch (adapter->iov_mode) {
	case IXGBE_64_VM:
		mrqc    |= IXGBE_MRQC_VMDQRSS64EN;
		mtqc    |= IXGBE_MTQC_64VF;
		gcr_ext |= IXGBE_GCR_EXT_VT_MODE_64;
		gpie    |= IXGBE_GPIE_VTMODE_64;
		break;
	case IXGBE_32_VM:
		mrqc    |= IXGBE_MRQC_VMDQRSS32EN;
		mtqc    |= IXGBE_MTQC_32VF;
		gcr_ext |= IXGBE_GCR_EXT_VT_MODE_32;
		gpie    |= IXGBE_GPIE_VTMODE_32;
		break;
	default:
		panic("Unexpected SR-IOV mode %d", adapter->iov_mode);
	}
	/* Write... */
	IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
	IXGBE_WRITE_REG(hw, IXGBE_MTQC, mtqc);
	IXGBE_WRITE_REG(hw, IXGBE_GCR_EXT, gcr_ext);
	IXGBE_WRITE_REG(hw, IXGBE_GPIE, gpie);

	/* Enable rx/tx for the PF. */
	vf_reg = IXGBE_VF_INDEX(adapter->pool);
	IXGBE_WRITE_REG(hw, IXGBE_VFRE(vf_reg), IXGBE_VF_BIT(adapter->pool));
	IXGBE_WRITE_REG(hw, IXGBE_VFTE(vf_reg), IXGBE_VF_BIT(adapter->pool));

	/* Allow VM-to-VM communication. */
	IXGBE_WRITE_REG(hw, IXGBE_PFDTXGSWC, IXGBE_PFDTXGSWC_VT_LBEN);

	vt_ctl = IXGBE_VT_CTL_VT_ENABLE | IXGBE_VT_CTL_REPLEN;
	vt_ctl |= (adapter->pool << IXGBE_VT_CTL_POOL_SHIFT);
	IXGBE_WRITE_REG(hw, IXGBE_VT_CTL, vt_ctl);

	for (i = 0; i < adapter->num_vfs; i++)
		ixgbe_init_vf(adapter, &adapter->vfs[i]);
} /* ixgbe_initialize_iov */


/* Check the max frame setting of all active VF's */
void
ixgbe_recalculate_max_frame(struct adapter *adapter)
{
	struct ixgbe_vf *vf;

	IXGBE_CORE_LOCK_ASSERT(adapter);

	for (int i = 0; i < adapter->num_vfs; i++) {
		vf = &adapter->vfs[i];
		if (vf->flags & IXGBE_VF_ACTIVE)
			ixgbe_update_max_frame(adapter, vf->max_frame_size);
	}
} /* ixgbe_recalculate_max_frame */

int
ixgbe_add_vf(device_t dev, u16 vfnum, const nvlist_t *config)
{
	struct adapter *adapter;
	struct ixgbe_vf *vf;
	const void *mac;

	adapter = device_get_softc(dev);

	KASSERT(vfnum < adapter->num_vfs, ("VF index %d is out of range %d",
	    vfnum, adapter->num_vfs));

	IXGBE_CORE_LOCK(adapter);
	vf = &adapter->vfs[vfnum];
	vf->pool= vfnum;

	/* RAR[0] is used by the PF so use vfnum + 1 for VF RAR. */
	vf->rar_index = vfnum + 1;
	vf->default_vlan = 0;
	vf->max_frame_size = ETHER_MAX_LEN;
	ixgbe_update_max_frame(adapter, vf->max_frame_size);

	if (nvlist_exists_binary(config, "mac-addr")) {
		mac = nvlist_get_binary(config, "mac-addr", NULL);
		bcopy(mac, vf->ether_addr, ETHER_ADDR_LEN);
		if (nvlist_get_bool(config, "allow-set-mac"))
			vf->flags |= IXGBE_VF_CAP_MAC;
	} else
		/*
		 * If the administrator has not specified a MAC address then
		 * we must allow the VF to choose one.
		 */
		vf->flags |= IXGBE_VF_CAP_MAC;

	vf->flags |= IXGBE_VF_ACTIVE;

	ixgbe_init_vf(adapter, vf);
	IXGBE_CORE_UNLOCK(adapter);

	return (0);
} /* ixgbe_add_vf */

#else

void
ixgbe_handle_mbx(void *context, int pending)
{
	UNREFERENCED_2PARAMETER(context, pending);
} /* ixgbe_handle_mbx */

inline int
ixgbe_vf_que_index(int mode, int vfnum, int num)
{
	UNREFERENCED_2PARAMETER(mode, vfnum);

	return num;
} /* ixgbe_vf_que_index */

#endif