PF_RING-5.6.0/drivers/DNA/ixgbe-3.10.16-DNA/src/ixgbe_lib.c

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

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2012 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

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

#ifdef HAVE_TX_MQ
/**
 * ixgbe_cache_ring_dcb_vmdq - Descriptor ring to register mapping for VMDq
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for VMDq to the assigned rings.  It
 * will also try to cache the proper offsets if RSS/FCoE are enabled along
 * with VMDq.
 *
 **/
static bool ixgbe_cache_ring_dcb_vmdq(struct ixgbe_adapter *adapter)
{
#ifdef IXGBE_FCOE
	struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
#endif /* IXGBE_FCOE */
	struct ixgbe_ring_feature *vmdq = &adapter->ring_feature[RING_F_VMDQ];
	int i;
	u16 reg_idx;
	u8 tcs = netdev_get_num_tc(adapter->netdev);

	/* verify we have DCB enabled before proceeding */
	if (tcs <= 1)
		return false;

	/* verify we have VMDq enabled before proceeding */
	if (!(adapter->flags & IXGBE_FLAG_VMDQ_ENABLED))
		return false;

	switch (adapter->hw.mac.type) {
	case ixgbe_mac_82598EB:
		/*
		 * The bits on the 82598 are reversed compared to the other
		 * adapters.  The DCB bits are the higher order bits and the
		 * lower bits belong to the VMDq pool.  In order to sort
		 * this out we have to swap the bits to get the correct layout
		 */
		for (i = 0; i < adapter->num_rx_queues; i++) {
			u8 reg_idx = ((i >> 3) | (i << 3)) & 0x3F;
			adapter->rx_ring[i]->reg_idx = reg_idx;
		}
		for (i = 0; i < adapter->num_tx_queues; i++) {
			u8 reg_idx = ((i >> 4) | (i << 2)) & 0x1F;
			adapter->tx_ring[i]->reg_idx = reg_idx;
		}
		break;
	case ixgbe_mac_82599EB:
	case ixgbe_mac_X540:
		/* start at VMDq register offset for SR-IOV enabled setups */
		reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask);
		for (i = 0; i < adapter->num_rx_queues; i++, reg_idx++) {
			/* If we are greater than indices move to next pool */
			if ((reg_idx & ~vmdq->mask) >= tcs)
				reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask);
			adapter->rx_ring[i]->reg_idx = reg_idx;
		}

		reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask);
		for (i = 0; i < adapter->num_tx_queues; i++, reg_idx++) {
			/* If we are greater than indices move to next pool */
			if ((reg_idx & ~vmdq->mask) >= tcs)
				reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask);
			adapter->tx_ring[i]->reg_idx = reg_idx;
		}

		break;
	default:
		break;
	}

#ifdef IXGBE_FCOE
	/* nothing to do if FCoE is disabled */
	if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
		return true;

	/* The work is already done if the FCoE ring is shared */
	if (fcoe->offset < tcs)
		return true;

	/* The FCoE rings exist separately, we need to move their reg_idx */
	if (fcoe->indices) {
		u16 queues_per_pool = __ALIGN_MASK(1, ~vmdq->mask);
		u8 fcoe_tc = ixgbe_fcoe_get_tc(adapter);

		reg_idx = (vmdq->offset + vmdq->indices) * queues_per_pool;
		for (i = fcoe->offset; i < adapter->num_rx_queues; i++) {
			reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask) + fcoe_tc;
			adapter->rx_ring[i]->reg_idx = reg_idx;
			reg_idx++;
		}

		reg_idx = (vmdq->offset + vmdq->indices) * queues_per_pool;
		for (i = fcoe->offset; i < adapter->num_tx_queues; i++) {
			reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask) + fcoe_tc;
			adapter->tx_ring[i]->reg_idx = reg_idx;
			reg_idx++;
		}
	}

#endif /* IXGBE_FCOE */
	return true;
}

/* ixgbe_get_first_reg_idx - Return first register index associated with ring */
static void ixgbe_get_first_reg_idx(struct ixgbe_adapter *adapter, u8 tc,
				    unsigned int *tx, unsigned int *rx)
{
	struct ixgbe_hw *hw = &adapter->hw;
	struct net_device *dev = adapter->netdev;
	u8 num_tcs = netdev_get_num_tc(dev);

	*tx = 0;
	*rx = 0;

	switch (hw->mac.type) {
	case ixgbe_mac_82598EB:
		/* TxQs/TC: 4	RxQs/TC: 8 */
		*tx = tc << 2; /* 0, 4,  8, 12, 16, 20, 24, 28 */
		*rx = tc << 3; /* 0, 8, 16, 24, 32, 40, 48, 56 */
		break;
	case ixgbe_mac_82599EB:
	case ixgbe_mac_X540:
		if (num_tcs > 4) {
			/*
			 * TCs    : TC0/1 TC2/3 TC4-7
			 * TxQs/TC:    32    16     8
			 * RxQs/TC:    16    16    16
			 */
			*rx = tc << 4;
			if (tc < 3)
				*tx = tc << 5;		/*   0,  32,  64 */
			else if (tc < 5)
				*tx = (tc + 2) << 4;	/*  80,  96 */
			else
				*tx = (tc + 8) << 3;	/* 104, 112, 120 */
		} else {
			/*
			 * TCs    : TC0 TC1 TC2/3
			 * TxQs/TC:  64  32    16
			 * RxQs/TC:  32  32    32
			 */
			*rx = tc << 5;
			if (tc < 2)
				*tx = tc << 6;		/*  0,  64 */
			else
				*tx = (tc + 4) << 4;	/* 96, 112 */
		}
	default:
		break;
	}
}

/**
 * ixgbe_cache_ring_dcb - Descriptor ring to register mapping for DCB
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for DCB to the assigned rings.
 *
 **/
static bool ixgbe_cache_ring_dcb(struct ixgbe_adapter *adapter)
{
	int tc, offset, rss_i, i;
	unsigned int tx_idx, rx_idx;
	struct net_device *dev = adapter->netdev;
	u8 num_tcs = netdev_get_num_tc(dev);

	if (num_tcs <= 1)
		return false;

	rss_i = adapter->ring_feature[RING_F_RSS].indices;

	for (tc = 0, offset = 0; tc < num_tcs; tc++, offset += rss_i) {
		ixgbe_get_first_reg_idx(adapter, tc, &tx_idx, &rx_idx);
		for (i = 0; i < rss_i; i++, tx_idx++, rx_idx++) {
			adapter->tx_ring[offset + i]->reg_idx = tx_idx;
			adapter->rx_ring[offset + i]->reg_idx = rx_idx;
			adapter->tx_ring[offset + i]->dcb_tc = tc;
			adapter->rx_ring[offset + i]->dcb_tc = tc;
		}
	}

	return true;
}

#endif /* HAVE_TX_MQ */
/**
 * ixgbe_cache_ring_vmdq - Descriptor ring to register mapping for VMDq
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for VMDq to the assigned rings.  It
 * will also try to cache the proper offsets if RSS/FCoE are enabled along
 * with VMDq.
 *
 **/
static bool ixgbe_cache_ring_vmdq(struct ixgbe_adapter *adapter)
{
#ifdef IXGBE_FCOE
	struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
#endif /* IXGBE_FCOE */
	struct ixgbe_ring_feature *vmdq = &adapter->ring_feature[RING_F_VMDQ];
	struct ixgbe_ring_feature *rss = &adapter->ring_feature[RING_F_RSS];
	int i;
	u16 reg_idx;

	/* only proceed if VMDq is enabled */
	if (!(adapter->flags & IXGBE_FLAG_VMDQ_ENABLED))
		return false;

	/* start at VMDq register offset for SR-IOV enabled setups */
	reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask);
	for (i = 0; i < adapter->num_rx_queues; i++, reg_idx++) {
#ifdef IXGBE_FCOE
		/* Allow first FCoE queue to be mapped as RSS */
		if (fcoe->offset && (i > fcoe->offset))
			break;
#endif
		/* If we are greater than indices move to next pool */
		if ((reg_idx & ~vmdq->mask) >= rss->indices)
			reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask);
		adapter->rx_ring[i]->reg_idx = reg_idx;
	}

#ifdef IXGBE_FCOE
	/* FCoE uses a linear block of queues so just assigning 1:1 */
	for (; i < adapter->num_rx_queues; i++, reg_idx++)
		adapter->rx_ring[i]->reg_idx = reg_idx;

#endif
	reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask);
	for (i = 0; i < adapter->num_tx_queues; i++, reg_idx++) {
#ifdef IXGBE_FCOE
		/* Allow first FCoE queue to be mapped as RSS */
		if (fcoe->offset && (i > fcoe->offset))
			break;
#endif
		/* If we are greater than indices move to next pool */
		if ((reg_idx & rss->mask) >= rss->indices)
			reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask);
		adapter->tx_ring[i]->reg_idx = reg_idx;
	}

#ifdef IXGBE_FCOE
	/* FCoE uses a linear block of queues so just assigning 1:1 */
	for (; i < adapter->num_tx_queues; i++, reg_idx++)
		adapter->tx_ring[i]->reg_idx = reg_idx;

#endif


	return true;
}

/**
 * ixgbe_cache_ring_rss - Descriptor ring to register mapping for RSS
 * @adapter: board private structure to initialize
 *
 * Cache the descriptor ring offsets for RSS, ATR, FCoE, and SR-IOV.
 *
 **/
static bool ixgbe_cache_ring_rss(struct ixgbe_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_rx_queues; i++)
		adapter->rx_ring[i]->reg_idx = i;

	for (i = 0; i < adapter->num_tx_queues; i++)
		adapter->tx_ring[i]->reg_idx = i;

	return true;
}

/**
 * ixgbe_cache_ring_register - Descriptor ring to register mapping
 * @adapter: board private structure to initialize
 *
 * Once we know the feature-set enabled for the device, we'll cache
 * the register offset the descriptor ring is assigned to.
 *
 * Note, the order the various feature calls is important.  It must start with
 * the "most" features enabled at the same time, then trickle down to the
 * least amount of features turned on at once.
 **/
static void ixgbe_cache_ring_register(struct ixgbe_adapter *adapter)
{
#ifdef HAVE_TX_MQ
	if (ixgbe_cache_ring_dcb_vmdq(adapter))
		return;

	if (ixgbe_cache_ring_dcb(adapter))
		return;

#endif
	if (ixgbe_cache_ring_vmdq(adapter))
		return;

	ixgbe_cache_ring_rss(adapter);
}

#define IXGBE_RSS_16Q_MASK	0xF
#define IXGBE_RSS_8Q_MASK	0x7
#define IXGBE_RSS_4Q_MASK	0x3
#define IXGBE_RSS_2Q_MASK	0x1
#define IXGBE_RSS_DISABLED_MASK	0x0

#ifdef HAVE_TX_MQ
/**
 * ixgbe_set_dcb_vmdq_queues: Allocate queues for VMDq devices w/ DCB
 * @adapter: board private structure to initialize
 *
 * When VMDq (Virtual Machine Devices queue) is enabled, allocate queues
 * and VM pools where appropriate.  Also assign queues based on DCB
 * priorities and map accordingly..
 *
 **/
static bool ixgbe_set_dcb_vmdq_queues(struct ixgbe_adapter *adapter)
{
	int i;
	u16 vmdq_i = adapter->ring_feature[RING_F_VMDQ].limit;
	u16 vmdq_m = 0;
	u8 tcs = netdev_get_num_tc(adapter->netdev);
#ifdef IXGBE_FCOE
	u16 fcoe_i = 0;
#endif

	/* verify we have DCB enabled before proceeding */
	if (tcs <= 1)
		return false;

	/* verify we have VMDq enabled before proceeding */
	if (!(adapter->flags & IXGBE_FLAG_VMDQ_ENABLED))
		return false;

	switch (adapter->hw.mac.type) {
	case ixgbe_mac_82598EB:
		/* 4 pools w/ 8TC per pool */
		vmdq_i = min_t(u16, vmdq_i, 4);
		vmdq_m = 0x7;
		break;
	case ixgbe_mac_82599EB:
	case ixgbe_mac_X540:
		/* Add starting offset to total pool count */
		vmdq_i += adapter->ring_feature[RING_F_VMDQ].offset;

		/* 16 pools w/ 8 TC per pool */
		if (tcs > 4) {
			vmdq_i = min_t(u16, vmdq_i, 16);
			vmdq_m = IXGBE_82599_VMDQ_8Q_MASK;
		/* 32 pools w/ 4 TC per pool */
		} else {
			vmdq_i = min_t(u16, vmdq_i, 32);
			vmdq_m = IXGBE_82599_VMDQ_4Q_MASK;
		}

#ifdef IXGBE_FCOE
		/* queues in the remaining pools are available for FCoE */
		fcoe_i = (128 / __ALIGN_MASK(1, ~vmdq_m)) - vmdq_i;

#endif
		/* remove the starting offset from the pool count */
		vmdq_i -= adapter->ring_feature[RING_F_VMDQ].offset;

		break;
	default:
		/* unknown hardware, only support one pool w/ one queue */
		vmdq_i = 1;
		tcs = 1;
		break;
	}

	/* save features for later use */
	adapter->ring_feature[RING_F_VMDQ].indices = vmdq_i;
	adapter->ring_feature[RING_F_VMDQ].mask = vmdq_m;

	/*
	 * We do not support DCB, VMDq, and RSS all simultaneously
	 * so we will disable RSS since it is the lowest priority
	 */
	adapter->ring_feature[RING_F_RSS].indices = 1;
	adapter->ring_feature[RING_F_RSS].mask = IXGBE_RSS_DISABLED_MASK;

	adapter->num_rx_pools = vmdq_i;
	adapter->num_rx_queues_per_pool = tcs;

	adapter->num_tx_queues = vmdq_i * tcs;
	adapter->num_rx_queues = vmdq_i * tcs;

	/* disable ATR as it is not supported when VMDq is enabled */
	adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;

#ifdef IXGBE_FCOE
	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
		struct ixgbe_ring_feature *fcoe;

		fcoe = &adapter->ring_feature[RING_F_FCOE];

		/* limit ourselves based on feature limits */
		fcoe_i = min_t(u16, fcoe_i, num_online_cpus());
		fcoe_i = min_t(u16, fcoe_i, fcoe->limit);

		if (fcoe_i) {
			/* alloc queues for FCoE separately */
			fcoe->indices = fcoe_i;
			fcoe->offset = vmdq_i * tcs;

			/* add queues to adapter */
			adapter->num_tx_queues += fcoe_i;
			adapter->num_rx_queues += fcoe_i;
		} else if (tcs > 1) {
			/* use queue belonging to FcoE TC */
			fcoe->indices = 1;
			fcoe->offset = ixgbe_fcoe_get_tc(adapter);
		} else {
			adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;

			fcoe->indices = 0;
			fcoe->offset = 0;
		}
	}

#endif /* IXGBE_FCOE */
	/* configure TC to queue mapping */
	for (i = 0; i < tcs; i++)
		netdev_set_tc_queue(adapter->netdev, i, 1, i);

	return true;
}

/**
 * ixgbe_set_dcb_queues: Allocate queues for a DCB-enabled device
 * @adapter: board private structure to initialize
 *
 * When DCB (Data Center Bridging) is enabled, allocate queues for
 * each traffic class.  If multiqueue isn't available,then abort DCB
 * initialization.
 *
 * This function handles all combinations of DCB, RSS, and FCoE.
 *
 **/
static bool ixgbe_set_dcb_queues(struct ixgbe_adapter *adapter)
{
	struct net_device *dev = adapter->netdev;
	struct ixgbe_ring_feature *f;
	int rss_i, rss_m, i;
	int tcs;

	/* Map queue offset and counts onto allocated tx queues */
	tcs = netdev_get_num_tc(dev);

	if (tcs <= 1)
		return false;

	/* determine the upper limit for our current DCB mode */
	rss_i = dev->num_tx_queues / tcs;
	if (adapter->hw.mac.type == ixgbe_mac_82598EB) {
		/* 8 TC w/ 4 queues per TC */
		rss_i = min_t(u16, rss_i, 4);
		rss_m = IXGBE_RSS_4Q_MASK;
	} else if (tcs > 4) {
		/* 8 TC w/ 8 queues per TC */
		rss_i = min_t(u16, rss_i, 8);
		rss_m = IXGBE_RSS_8Q_MASK;
	} else {
		/* 4 TC w/ 16 queues per TC */
		rss_i = min_t(u16, rss_i, 16);
		rss_m = IXGBE_RSS_16Q_MASK;
	}

	/* set RSS mask and indices */
	f = &adapter->ring_feature[RING_F_RSS];
	rss_i = min_t(u16, rss_i, f->limit);
	f->indices = rss_i;
	f->mask = rss_m;

	/* disable ATR as it is not supported when DCB is enabled */
	adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;

#ifdef IXGBE_FCOE
	/*
	 * FCoE enabled queues require special configuration indexed
	 * by feature specific indices and mask. Here we map FCoE
	 * indices onto the DCB queue pairs allowing FCoE to own
	 * configuration later.
	 */
	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
		u8 tc = ixgbe_fcoe_get_tc(adapter);

		f = &adapter->ring_feature[RING_F_FCOE];
		f->indices = min_t(u16, rss_i, f->limit);
		f->offset = rss_i * tc;
	}

#endif /* IXGBE_FCOE */
	for (i = 0; i < tcs; i++)
		netdev_set_tc_queue(dev, i, rss_i, rss_i * i);

	adapter->num_tx_queues = rss_i * tcs;
	adapter->num_rx_queues = rss_i * tcs;

	return true;
}

#endif
/**
 * ixgbe_set_vmdq_queues: Allocate queues for VMDq devices
 * @adapter: board private structure to initialize
 *
 * When VMDq (Virtual Machine Devices queue) is enabled, allocate queues
 * and VM pools where appropriate.  If RSS is available, then also try and
 * enable RSS and map accordingly.
 *
 **/
static bool ixgbe_set_vmdq_queues(struct ixgbe_adapter *adapter)
{
	u16 vmdq_i = adapter->ring_feature[RING_F_VMDQ].limit;
	u16 vmdq_m = 0;
	u16 rss_i = adapter->ring_feature[RING_F_RSS].limit;
	u16 rss_m = IXGBE_RSS_DISABLED_MASK;
#ifdef IXGBE_FCOE
	u16 fcoe_i = 0;
#endif

	/* only proceed if VMDq is enabled */
	if (!(adapter->flags & IXGBE_FLAG_VMDQ_ENABLED))
		return false;


	switch (adapter->hw.mac.type) {
	case ixgbe_mac_82598EB:
		vmdq_i = min_t(u16, vmdq_i, 16);
		/* 16 pool mode with 1 queue per pool */
		if ((vmdq_i > 4) || (rss_i == 1)) {
			vmdq_m = 0x0F;
			rss_i = 1;
		/* 4 pool mode with 8 queue per pool */
		} else {
			vmdq_m = 0x18;
			rss_m = IXGBE_RSS_8Q_MASK;
			rss_i = min_t(u16, rss_i, 8);
		}
		break;
	case ixgbe_mac_82599EB:
	case ixgbe_mac_X540:
		/* Add starting offset to total pool count */
		vmdq_i += adapter->ring_feature[RING_F_VMDQ].offset;

		/* double check we are limited to maximum pools */
		vmdq_i = min_t(u16, IXGBE_MAX_VMDQ_INDICES, vmdq_i);

		/* 64 pool mode with 2 queues per pool */
		if ((vmdq_i > 32) || (rss_i < 4)) {
			vmdq_m = IXGBE_82599_VMDQ_2Q_MASK;
			rss_m = IXGBE_RSS_2Q_MASK;
			rss_i = min_t(u16, rss_i, 2);
		/* 32 pool mode with 4 queues per pool */
		} else {
			vmdq_m = IXGBE_82599_VMDQ_4Q_MASK;
			rss_m = IXGBE_RSS_4Q_MASK;
			rss_i = 4;
		}

#ifdef IXGBE_FCOE
		/* queues in the remaining pools are available for FCoE */
		fcoe_i = 128 - (vmdq_i * __ALIGN_MASK(1, ~vmdq_m));

#endif
		/* remove the starting offset from the pool count */
		vmdq_i -= adapter->ring_feature[RING_F_VMDQ].offset;

		break;
	default:
		/* unknown hardware, support one pool w/ one queue */
		vmdq_i = 1;
		rss_i = 1;
		break;
	}

	/* save features for later use */
	adapter->ring_feature[RING_F_VMDQ].indices = vmdq_i;
	adapter->ring_feature[RING_F_VMDQ].mask = vmdq_m;

	/* limit RSS based on user input and save for later use */
	adapter->ring_feature[RING_F_RSS].indices = rss_i;
	adapter->ring_feature[RING_F_RSS].mask = rss_m;

	adapter->num_rx_pools = vmdq_i;
	adapter->num_rx_queues_per_pool = rss_i;

	adapter->num_rx_queues = vmdq_i * rss_i;
#ifdef HAVE_TX_MQ
	adapter->num_tx_queues = vmdq_i * rss_i;
#else
	adapter->num_tx_queues = vmdq_i;
#endif /* HAVE_TX_MQ */

	/* disable ATR as it is not supported when VMDq is enabled */
	adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;

#ifdef IXGBE_FCOE
	/*
	 * FCoE can use rings from adjacent buffers to allow RSS
	 * like behavior.  To account for this we need to add the
	 * FCoE indices to the total ring count.
	 */
	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
		struct ixgbe_ring_feature *fcoe;

		fcoe = &adapter->ring_feature[RING_F_FCOE];

		/* limit ourselves based on feature limits */
		fcoe_i = min_t(u16, fcoe_i, fcoe->limit);

		if (vmdq_i > 1 && fcoe_i) {
			/* reserve no more than number of CPUs */
			fcoe_i = min_t(u16, fcoe_i, num_online_cpus());

			/* alloc queues for FCoE separately */
			fcoe->indices = fcoe_i;
			fcoe->offset = vmdq_i * rss_i;
		} else {
			/* merge FCoE queues with RSS queues */
			fcoe_i = min_t(u16, fcoe_i + rss_i, num_online_cpus());

			/* limit indices to rss_i if MSI-X is disabled */
			if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
				fcoe_i = rss_i;

			/* attempt to reserve some queues for just FCoE */
			fcoe->indices = min_t(u16, fcoe_i, fcoe->limit);
			fcoe->offset = fcoe_i - fcoe->indices;
			fcoe_i -= rss_i;
		}

		/* add queues to adapter */
		adapter->num_tx_queues += fcoe_i;
		adapter->num_rx_queues += fcoe_i;
	}

#endif
	return true;
}

/**
 * ixgbe_set_rss_queues: Allocate queues for RSS
 * @adapter: board private structure to initialize
 *
 * This is our "base" multiqueue mode.  RSS (Receive Side Scaling) will try
 * to allocate one Rx queue per CPU, and if available, one Tx queue per CPU.
 *
 **/
static bool ixgbe_set_rss_queues(struct ixgbe_adapter *adapter)
{
	struct ixgbe_ring_feature *f;
	u16 rss_i;

	/* set mask for 16 queue limit of RSS */
	f = &adapter->ring_feature[RING_F_RSS];
	rss_i = f->limit;

	f->indices = rss_i;
	f->mask = IXGBE_RSS_16Q_MASK;

	/* disable ATR by default, it will be configured below */
	adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE;

	/*
	 * Use Flow Director in addition to RSS to ensure the best
	 * distribution of flows across cores, even when an FDIR flow
	 * isn't matched.
	 */
	if (rss_i > 1 && adapter->atr_sample_rate) {
		f = &adapter->ring_feature[RING_F_FDIR];

		f->indices = min_t(u16, num_online_cpus(), f->limit);
		rss_i = max_t(u16, rss_i, f->indices);

		if (!(adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE))
			adapter->flags |= IXGBE_FLAG_FDIR_HASH_CAPABLE;
	}

#ifdef IXGBE_FCOE
	/*
	 * FCoE can exist on the same rings as standard network traffic
	 * however it is preferred to avoid that if possible.  In order
	 * to get the best performance we allocate as many FCoE queues
	 * as we can and we place them at the end of the ring array to
	 * avoid sharing queues with standard RSS on systems with 24 or
	 * more CPUs.
	 */
	if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
		u16 fcoe_i;

		f = &adapter->ring_feature[RING_F_FCOE];

		/* merge FCoE queues with RSS queues */
		fcoe_i = min_t(u16, f->limit + rss_i, num_online_cpus());

		/* limit indices to rss_i if MSI-X is disabled */
		if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED))
			fcoe_i = rss_i;

		/* attempt to reserve some queues for just FCoE */
		f->indices = min_t(u16, fcoe_i, f->limit);
		f->offset = fcoe_i - f->indices;
		rss_i = max_t(u16, fcoe_i, rss_i);
	}

#endif /* IXGBE_FCOE */
	adapter->num_rx_queues = rss_i;
#ifdef HAVE_TX_MQ
	adapter->num_tx_queues = rss_i;
#endif

	return true;
}

/*
 * ixgbe_set_num_queues: Allocate queues for device, feature dependent
 * @adapter: board private structure to initialize
 *
 * This is the top level queue allocation routine.  The order here is very
 * important, starting with the "most" number of features turned on at once,
 * and ending with the smallest set of features.  This way large combinations
 * can be allocated if they're turned on, and smaller combinations are the
 * fallthrough conditions.
 *
 **/
static void ixgbe_set_num_queues(struct ixgbe_adapter *adapter)
{
	/* Start with base case */
	adapter->num_rx_queues = 1;
	adapter->num_tx_queues = 1;
	adapter->num_rx_pools = adapter->num_rx_queues;
	adapter->num_rx_queues_per_pool = 1;

#ifdef HAVE_TX_MQ
	if (ixgbe_set_dcb_vmdq_queues(adapter))
		return;

	if (ixgbe_set_dcb_queues(adapter))
		return;

#endif
	if (ixgbe_set_vmdq_queues(adapter))
		return;

	ixgbe_set_rss_queues(adapter);
}

static void ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter,
				       int vectors)
{
	int err, vector_threshold;

	/*
	 * We'll want at least 2 (vector_threshold):
	 * 1) TxQ[0] + RxQ[0] handler
	 * 2) Other (Link Status Change, etc.)
	 */
		vector_threshold = MIN_MSIX_COUNT;

	/*
	 * The more we get, the more we will assign to Tx/Rx Cleanup
	 * for the separate queues...where Rx Cleanup >= Tx Cleanup.
	 * Right now, we simply care about how many we'll get; we'll
	 * set them up later while requesting irq's.
	 */
	while (vectors >= vector_threshold) {
		err = pci_enable_msix(adapter->pdev, adapter->msix_entries,
				      vectors);
		if (!err) /* Success in acquiring all requested vectors. */
			break;
		else if (err < 0)
			vectors = 0; /* Nasty failure, quit now */
		else /* err == number of vectors we should try again with */
			vectors = err;
	}

	if (vectors < vector_threshold) {
		/* Can't allocate enough MSI-X interrupts?  Oh well.
		 * This just means we'll go with either a single MSI
		 * vector or fall back to legacy interrupts.
		 */
		e_warn(hw, "Unable to allocate MSI-X interrupts\n");
		adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED;
		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
	} else {
		adapter->flags |= IXGBE_FLAG_MSIX_ENABLED; /* Woot! */
		/*
		 * Adjust for only the vectors we'll use, which is minimum
		 * of max_q_vectors, or the number of vectors we were allocated.
		 */
		vectors -= NON_Q_VECTORS;
		adapter->num_q_vectors = min(vectors, adapter->max_q_vectors);
	}
}

static void ixgbe_add_ring(struct ixgbe_ring *ring,
			   struct ixgbe_ring_container *head)
{
	ring->next = head->ring;
	head->ring = ring;
	head->count++;
}

/**
 * ixgbe_alloc_q_vector - Allocate memory for a single interrupt vector
 * @adapter: board private structure to initialize
 * @v_count: q_vectors allocated on adapter, used for ring interleaving
 * @v_idx: index of vector in adapter struct
 * @txr_count: total number of Tx rings to allocate
 * @txr_idx: index of first Tx ring to allocate
 * @rxr_count: total number of Rx rings to allocate
 * @rxr_idx: index of first Rx ring to allocate
 *
 * We allocate one q_vector.  If allocation fails we return -ENOMEM.
 **/
static int ixgbe_alloc_q_vector(struct ixgbe_adapter *adapter,
				unsigned int v_count, unsigned int v_idx,
				unsigned int txr_count, unsigned int txr_idx,
				unsigned int rxr_count, unsigned int rxr_idx)
{
	struct ixgbe_q_vector *q_vector;
	struct ixgbe_ring *ring;
	int node = -1;
#ifdef HAVE_IRQ_AFFINITY_HINT
	int cpu = -1;
#endif
	int ring_count, size;

	ring_count = txr_count + rxr_count;
	size = sizeof(struct ixgbe_q_vector) +
	       (sizeof(struct ixgbe_ring) * ring_count);

#ifdef HAVE_IRQ_AFFINITY_HINT
	/* customize cpu for Flow Director mapping */
	if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) {
		if (cpu_online(v_idx)) {
			cpu = v_idx;
			node = cpu_to_node(cpu);
		}
	}

#endif
	/* allocate q_vector and rings */
	q_vector = kzalloc_node(size, GFP_KERNEL, node);
	if (!q_vector)
		q_vector = kzalloc(size, GFP_KERNEL);
	if (!q_vector)
		return -ENOMEM;

	/* setup affinity mask and node */
#ifdef HAVE_IRQ_AFFINITY_HINT
	if (cpu != -1)
		cpumask_set_cpu(cpu, &q_vector->affinity_mask);
	else
		cpumask_copy(&q_vector->affinity_mask, cpu_online_mask);
#endif
	q_vector->numa_node = node;

#ifndef IXGBE_NO_LRO
	/* initialize LRO */
	__skb_queue_head_init(&q_vector->lrolist.active);

#endif
	/* initialize NAPI */
	netif_napi_add(adapter->netdev, &q_vector->napi,
		       ixgbe_poll, 64);

	/* tie q_vector and adapter together */
	adapter->q_vector[v_idx] = q_vector;
	q_vector->adapter = adapter;
	q_vector->v_idx = v_idx;

	/* initialize work limits */
	q_vector->tx.work_limit = adapter->tx_work_limit;
	q_vector->rx.work_limit = adapter->rx_work_limit;

	/* initialize pointer to rings */
	ring = q_vector->ring;

	while (txr_count) {
		/* assign generic ring traits */
		ring->dev = pci_dev_to_dev(adapter->pdev);
		ring->netdev = adapter->netdev;

		/* configure backlink on ring */
		ring->q_vector = q_vector;

		/* update q_vector Tx values */
		ixgbe_add_ring(ring, &q_vector->tx);

		/* apply Tx specific ring traits */
		ring->count = adapter->tx_ring_count;
		ring->queue_index = txr_idx;

		/* assign ring to adapter */
		adapter->tx_ring[txr_idx] = ring;

		/* update count and index */
		txr_count--;
		txr_idx += v_count;

		/* push pointer to next ring */
		ring++;
	}

	while (rxr_count) {
		/* assign generic ring traits */
		ring->dev = pci_dev_to_dev(adapter->pdev);
		ring->netdev = adapter->netdev;

		/* configure backlink on ring */
		ring->q_vector = q_vector;

		/* update q_vector Rx values */
		ixgbe_add_ring(ring, &q_vector->rx);

		/*
		 * 82599 errata, UDP frames with a 0 checksum
		 * can be marked as checksum errors.
		 */
		if (adapter->hw.mac.type == ixgbe_mac_82599EB)
			set_bit(__IXGBE_RX_CSUM_UDP_ZERO_ERR, &ring->state);

#ifndef HAVE_NDO_SET_FEATURES
		/* enable rx csum by default */
		set_bit(__IXGBE_RX_CSUM_ENABLED, &ring->state);

#endif
#ifdef IXGBE_FCOE
		if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
			struct ixgbe_ring_feature *f;
			f = &adapter->ring_feature[RING_F_FCOE];

			if ((rxr_idx >= f->offset) &&
			    (rxr_idx < f->offset + f->indices)) {
				set_bit(__IXGBE_RX_FCOE, &ring->state);
			}
		}

#endif
		/* apply Rx specific ring traits */
		ring->count = adapter->rx_ring_count;
		ring->queue_index = rxr_idx;

		/* assign ring to adapter */
		adapter->rx_ring[rxr_idx] = ring;

		/* update count and index */
		rxr_count--;
		rxr_idx += v_count;

		/* push pointer to next ring */
		ring++;
	}

	return 0;
}

/**
 * ixgbe_free_q_vector - Free memory allocated for specific interrupt vector
 * @adapter: board private structure to initialize
 * @v_idx: Index of vector to be freed
 *
 * This function frees the memory allocated to the q_vector.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void ixgbe_free_q_vector(struct ixgbe_adapter *adapter, int v_idx)
{
	struct ixgbe_q_vector *q_vector = adapter->q_vector[v_idx];
	struct ixgbe_ring *ring;

	ixgbe_for_each_ring(ring, q_vector->tx)
		adapter->tx_ring[ring->queue_index] = NULL;

	ixgbe_for_each_ring(ring, q_vector->rx)
		adapter->rx_ring[ring->queue_index] = NULL;

	adapter->q_vector[v_idx] = NULL;
	netif_napi_del(&q_vector->napi);
#ifndef IXGBE_NO_LRO
	__skb_queue_purge(&q_vector->lrolist.active);
#endif
	kfree(q_vector);
}

/**
 * ixgbe_alloc_q_vectors - Allocate memory for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * We allocate one q_vector per queue interrupt.  If allocation fails we
 * return -ENOMEM.
 **/
static int ixgbe_alloc_q_vectors(struct ixgbe_adapter *adapter)
{
	unsigned int q_vectors = adapter->num_q_vectors;
	unsigned int rxr_remaining = adapter->num_rx_queues;
	unsigned int txr_remaining = adapter->num_tx_queues;
	unsigned int rxr_idx = 0, txr_idx = 0, v_idx = 0;
	int err;

	if (q_vectors >= (rxr_remaining + txr_remaining)) {
		for (; rxr_remaining; v_idx++) {
			err = ixgbe_alloc_q_vector(adapter, q_vectors, v_idx,
						   0, 0, 1, rxr_idx);
			if (err)
				goto err_out;

			/* update counts and index */
			rxr_remaining--;
			rxr_idx++;
		}
	}

	for (; v_idx < q_vectors; v_idx++) {
		int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - v_idx);
		int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - v_idx);
		err = ixgbe_alloc_q_vector(adapter, q_vectors, v_idx,
					   tqpv, txr_idx,
					   rqpv, rxr_idx);

		if (err)
			goto err_out;

		/* update counts and index */
		rxr_remaining -= rqpv;
		txr_remaining -= tqpv;
		rxr_idx++;
		txr_idx++;
	}

	return 0;

err_out:
	adapter->num_tx_queues = 0;
	adapter->num_rx_queues = 0;
	adapter->num_q_vectors = 0;

	while (v_idx--)
		ixgbe_free_q_vector(adapter, v_idx);

	return -ENOMEM;
}

/**
 * ixgbe_free_q_vectors - Free memory allocated for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * This function frees the memory allocated to the q_vectors.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void ixgbe_free_q_vectors(struct ixgbe_adapter *adapter)
{
	int v_idx = adapter->num_q_vectors;

	adapter->num_tx_queues = 0;
	adapter->num_rx_queues = 0;
	adapter->num_q_vectors = 0;

	while (v_idx--)
		ixgbe_free_q_vector(adapter, v_idx);
}

static void ixgbe_reset_interrupt_capability(struct ixgbe_adapter *adapter)
{
	if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
		adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED;
		pci_disable_msix(adapter->pdev);
		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
	} else if (adapter->flags & IXGBE_FLAG_MSI_ENABLED) {
		adapter->flags &= ~IXGBE_FLAG_MSI_ENABLED;
		pci_disable_msi(adapter->pdev);
	}
}

/**
 * ixgbe_set_interrupt_capability - set MSI-X or MSI if supported
 * @adapter: board private structure to initialize
 *
 * Attempt to configure the interrupts using the best available
 * capabilities of the hardware and the kernel.
 **/
static void ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter)
{
	struct ixgbe_hw *hw = &adapter->hw;
	int err = 0;
	int vector, v_budget;

	if (!(adapter->flags & IXGBE_FLAG_MSIX_CAPABLE))
		goto try_msi;

	/*
	 * It's easy to be greedy for MSI-X vectors, but it really
	 * doesn't do us much good if we have a lot more vectors
	 * than CPU's.  So let's be conservative and only ask for
	 * (roughly) the same number of vectors as there are CPU's.
	 * the default is to use pairs of vectors
	 */
	v_budget = max(adapter->num_rx_queues, adapter->num_tx_queues);
	v_budget = min_t(int, v_budget, num_online_cpus());
	v_budget += NON_Q_VECTORS;

	/*
	 * At the same time, hardware can only support a maximum of
	 * hw.mac->max_msix_vectors vectors.  With features
	 * such as RSS and VMDq, we can easily surpass the number of Rx and Tx
	 * descriptor queues supported by our device.  Thus, we cap it off in
	 * those rare cases where the cpu count also exceeds our vector limit.
	 */
	v_budget = min_t(int, v_budget, hw->mac.max_msix_vectors);

	/* A failure in MSI-X entry allocation isn't fatal, but it does
	 * mean we disable MSI-X capabilities of the adapter. */
	adapter->msix_entries = kcalloc(v_budget,
					sizeof(struct msix_entry), GFP_KERNEL);
	if (adapter->msix_entries) {
		for (vector = 0; vector < v_budget; vector++)
			adapter->msix_entries[vector].entry = vector;

		ixgbe_acquire_msix_vectors(adapter, v_budget);

		if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED)
			return;
	}

try_msi:
	/* disable DCB if number of TCs exceeds 1 */
	if (netdev_get_num_tc(adapter->netdev) > 1) {
		e_err(probe, "num TCs exceeds number of queues - disabling DCB\n");
		netdev_reset_tc(adapter->netdev);

		if (adapter->hw.mac.type == ixgbe_mac_82598EB)
			adapter->hw.fc.requested_mode = adapter->last_lfc_mode;

		adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
		adapter->temp_dcb_cfg.pfc_mode_enable = false;
		adapter->dcb_cfg.pfc_mode_enable = false;
	}
	adapter->dcb_cfg.num_tcs.pg_tcs = 1;
	adapter->dcb_cfg.num_tcs.pfc_tcs = 1;

	/* disable VMDq */
	adapter->flags &= ~IXGBE_FLAG_VMDQ_ENABLED;

#ifdef CONFIG_PCI_IOV
	/* disable SR-IOV */
	ixgbe_disable_sriov(adapter);

#endif /* CONFIG_PCI_IOV */
	/* disable RSS */
	adapter->ring_feature[RING_F_RSS].limit = 1;

	ixgbe_set_num_queues(adapter);
	adapter->num_q_vectors = 1;

	if (!(adapter->flags & IXGBE_FLAG_MSI_CAPABLE))
		return;

	err = pci_enable_msi(adapter->pdev);
	if (err) {
		e_warn(hw, "Unable to allocate MSI interrupt, "
		       "falling back to legacy.  Error: %d\n", err);
		return;
	}
	adapter->flags |= IXGBE_FLAG_MSI_ENABLED;
}

/**
 * ixgbe_init_interrupt_scheme - Determine proper interrupt scheme
 * @adapter: board private structure to initialize
 *
 * We determine which interrupt scheme to use based on...
 * - Kernel support (MSI, MSI-X)
 *   - which can be user-defined (via MODULE_PARAM)
 * - Hardware queue count (num_*_queues)
 *   - defined by miscellaneous hardware support/features (RSS, etc.)
 **/
int ixgbe_init_interrupt_scheme(struct ixgbe_adapter *adapter)
{
	int err;

	/* Number of supported queues */
	ixgbe_set_num_queues(adapter);

	/* Set interrupt mode */
	ixgbe_set_interrupt_capability(adapter);

	/* Allocate memory for queues */
	err = ixgbe_alloc_q_vectors(adapter);
	if (err) {
		e_err(probe, "Unable to allocate memory for queue vectors\n");
		ixgbe_reset_interrupt_capability(adapter);
		return err;
	}

	ixgbe_cache_ring_register(adapter);

	set_bit(__IXGBE_DOWN, &adapter->state);

	return 0;
}

/**
 * ixgbe_clear_interrupt_scheme - Clear the current interrupt scheme settings
 * @adapter: board private structure to clear interrupt scheme on
 *
 * We go through and clear interrupt specific resources and reset the structure
 * to pre-load conditions
 **/
void ixgbe_clear_interrupt_scheme(struct ixgbe_adapter *adapter)
{
	ixgbe_free_q_vectors(adapter);
	ixgbe_reset_interrupt_capability(adapter);
}

void ixgbe_tx_ctxtdesc(struct ixgbe_ring *tx_ring, u32 vlan_macip_lens,
		       u32 fcoe_sof_eof, u32 type_tucmd, u32 mss_l4len_idx)
{
	struct ixgbe_adv_tx_context_desc *context_desc;
	u16 i = tx_ring->next_to_use;

	context_desc = IXGBE_TX_CTXTDESC(tx_ring, i);

	i++;
	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;

	/* set bits to identify this as an advanced context descriptor */
	type_tucmd |= IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT;

	context_desc->vlan_macip_lens	= cpu_to_le32(vlan_macip_lens);
	context_desc->seqnum_seed	= cpu_to_le32(fcoe_sof_eof);
	context_desc->type_tucmd_mlhl	= cpu_to_le32(type_tucmd);
	context_desc->mss_l4len_idx	= cpu_to_le32(mss_l4len_idx);
}