i40evf_main.c 65.3 KB
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/*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
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 * Copyright(c) 2013 - 2014 Intel Corporation.
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 *
 * 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.
 *
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 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
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 * 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 "i40evf.h"
#include "i40e_prototype.h"
static int i40evf_setup_all_tx_resources(struct i40evf_adapter *adapter);
static int i40evf_setup_all_rx_resources(struct i40evf_adapter *adapter);
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static void i40evf_free_all_tx_resources(struct i40evf_adapter *adapter);
static void i40evf_free_all_rx_resources(struct i40evf_adapter *adapter);
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static int i40evf_close(struct net_device *netdev);

char i40evf_driver_name[] = "i40evf";
static const char i40evf_driver_string[] =
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	"Intel(R) XL710/X710 Virtual Function Network Driver";
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#define DRV_VERSION "1.0.6"
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const char i40evf_driver_version[] = DRV_VERSION;
static const char i40evf_copyright[] =
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	"Copyright (c) 2013 - 2014 Intel Corporation.";
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/* i40evf_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
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static const struct pci_device_id i40evf_pci_tbl[] = {
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	{PCI_VDEVICE(INTEL, I40E_DEV_ID_VF), 0},
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	/* required last entry */
	{0, }
};

MODULE_DEVICE_TABLE(pci, i40evf_pci_tbl);

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) XL710 X710 Virtual Function Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

/**
 * i40evf_allocate_dma_mem_d - OS specific memory alloc for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 * @alignment: what to align the allocation to
 **/
i40e_status i40evf_allocate_dma_mem_d(struct i40e_hw *hw,
				      struct i40e_dma_mem *mem,
				      u64 size, u32 alignment)
{
	struct i40evf_adapter *adapter = (struct i40evf_adapter *)hw->back;

	if (!mem)
		return I40E_ERR_PARAM;

	mem->size = ALIGN(size, alignment);
	mem->va = dma_alloc_coherent(&adapter->pdev->dev, mem->size,
				     (dma_addr_t *)&mem->pa, GFP_KERNEL);
	if (mem->va)
		return 0;
	else
		return I40E_ERR_NO_MEMORY;
}

/**
 * i40evf_free_dma_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
i40e_status i40evf_free_dma_mem_d(struct i40e_hw *hw, struct i40e_dma_mem *mem)
{
	struct i40evf_adapter *adapter = (struct i40evf_adapter *)hw->back;

	if (!mem || !mem->va)
		return I40E_ERR_PARAM;
	dma_free_coherent(&adapter->pdev->dev, mem->size,
			  mem->va, (dma_addr_t)mem->pa);
	return 0;
}

/**
 * i40evf_allocate_virt_mem_d - OS specific memory alloc for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 **/
i40e_status i40evf_allocate_virt_mem_d(struct i40e_hw *hw,
				       struct i40e_virt_mem *mem, u32 size)
{
	if (!mem)
		return I40E_ERR_PARAM;

	mem->size = size;
	mem->va = kzalloc(size, GFP_KERNEL);

	if (mem->va)
		return 0;
	else
		return I40E_ERR_NO_MEMORY;
}

/**
 * i40evf_free_virt_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
i40e_status i40evf_free_virt_mem_d(struct i40e_hw *hw,
				   struct i40e_virt_mem *mem)
{
	if (!mem)
		return I40E_ERR_PARAM;

	/* it's ok to kfree a NULL pointer */
	kfree(mem->va);

	return 0;
}

/**
 * i40evf_debug_d - OS dependent version of debug printing
 * @hw:  pointer to the HW structure
 * @mask: debug level mask
 * @fmt_str: printf-type format description
 **/
void i40evf_debug_d(void *hw, u32 mask, char *fmt_str, ...)
{
	char buf[512];
	va_list argptr;

	if (!(mask & ((struct i40e_hw *)hw)->debug_mask))
		return;

	va_start(argptr, fmt_str);
	vsnprintf(buf, sizeof(buf), fmt_str, argptr);
	va_end(argptr);

	/* the debug string is already formatted with a newline */
	pr_info("%s", buf);
}

/**
 * i40evf_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 **/
static void i40evf_tx_timeout(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	adapter->tx_timeout_count++;
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	if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING)) {
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		adapter->flags |= I40EVF_FLAG_RESET_NEEDED;
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		schedule_work(&adapter->reset_task);
	}
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}

/**
 * i40evf_misc_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void i40evf_misc_irq_disable(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
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	wr32(hw, I40E_VFINT_DYN_CTL01, 0);

	/* read flush */
	rd32(hw, I40E_VFGEN_RSTAT);

	synchronize_irq(adapter->msix_entries[0].vector);
}

/**
 * i40evf_misc_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static void i40evf_misc_irq_enable(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
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	wr32(hw, I40E_VFINT_DYN_CTL01, I40E_VFINT_DYN_CTL01_INTENA_MASK |
				       I40E_VFINT_DYN_CTL01_ITR_INDX_MASK);
	wr32(hw, I40E_VFINT_ICR0_ENA1, I40E_VFINT_ICR0_ENA_ADMINQ_MASK);

	/* read flush */
	rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void i40evf_irq_disable(struct i40evf_adapter *adapter)
{
	int i;
	struct i40e_hw *hw = &adapter->hw;

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	if (!adapter->msix_entries)
		return;

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	for (i = 1; i < adapter->num_msix_vectors; i++) {
		wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), 0);
		synchronize_irq(adapter->msix_entries[i].vector);
	}
	/* read flush */
	rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_irq_enable_queues - Enable interrupt for specified queues
 * @adapter: board private structure
 * @mask: bitmap of queues to enable
 **/
void i40evf_irq_enable_queues(struct i40evf_adapter *adapter, u32 mask)
{
	struct i40e_hw *hw = &adapter->hw;
	int i;

	for (i = 1; i < adapter->num_msix_vectors; i++) {
		if (mask & (1 << (i - 1))) {
			wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1),
			     I40E_VFINT_DYN_CTLN1_INTENA_MASK |
			     I40E_VFINT_DYN_CTLN_CLEARPBA_MASK);
		}
	}
}

/**
 * i40evf_fire_sw_int - Generate SW interrupt for specified vectors
 * @adapter: board private structure
 * @mask: bitmap of vectors to trigger
 **/
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static void i40evf_fire_sw_int(struct i40evf_adapter *adapter, u32 mask)
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{
	struct i40e_hw *hw = &adapter->hw;
	int i;
	uint32_t dyn_ctl;

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	if (mask & 1) {
		dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTL01);
		dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
			   I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
		wr32(hw, I40E_VFINT_DYN_CTL01, dyn_ctl);
	}
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	for (i = 1; i < adapter->num_msix_vectors; i++) {
		if (mask & (1 << i)) {
			dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTLN1(i - 1));
			dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
				   I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
			wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), dyn_ctl);
		}
	}
}

/**
 * i40evf_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
void i40evf_irq_enable(struct i40evf_adapter *adapter, bool flush)
{
	struct i40e_hw *hw = &adapter->hw;

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	i40evf_misc_irq_enable(adapter);
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	i40evf_irq_enable_queues(adapter, ~0);

	if (flush)
		rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_msix_aq - Interrupt handler for vector 0
 * @irq: interrupt number
 * @data: pointer to netdev
 **/
static irqreturn_t i40evf_msix_aq(int irq, void *data)
{
	struct net_device *netdev = data;
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40e_hw *hw = &adapter->hw;
	u32 val;
	u32 ena_mask;

	/* handle non-queue interrupts */
	val = rd32(hw, I40E_VFINT_ICR01);
	ena_mask = rd32(hw, I40E_VFINT_ICR0_ENA1);


	val = rd32(hw, I40E_VFINT_DYN_CTL01);
	val = val | I40E_PFINT_DYN_CTL0_CLEARPBA_MASK;
	wr32(hw, I40E_VFINT_DYN_CTL01, val);

	/* re-enable interrupt causes */
	wr32(hw, I40E_VFINT_ICR0_ENA1, ena_mask);
	wr32(hw, I40E_VFINT_DYN_CTL01, I40E_VFINT_DYN_CTL01_INTENA_MASK);

	/* schedule work on the private workqueue */
	schedule_work(&adapter->adminq_task);

	return IRQ_HANDLED;
}

/**
 * i40evf_msix_clean_rings - MSIX mode Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a q_vector
 **/
static irqreturn_t i40evf_msix_clean_rings(int irq, void *data)
{
	struct i40e_q_vector *q_vector = data;

	if (!q_vector->tx.ring && !q_vector->rx.ring)
		return IRQ_HANDLED;

	napi_schedule(&q_vector->napi);

	return IRQ_HANDLED;
}

/**
 * i40evf_map_vector_to_rxq - associate irqs with rx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @r_idx: queue number
 **/
static void
i40evf_map_vector_to_rxq(struct i40evf_adapter *adapter, int v_idx, int r_idx)
{
	struct i40e_q_vector *q_vector = adapter->q_vector[v_idx];
	struct i40e_ring *rx_ring = adapter->rx_rings[r_idx];

	rx_ring->q_vector = q_vector;
	rx_ring->next = q_vector->rx.ring;
	rx_ring->vsi = &adapter->vsi;
	q_vector->rx.ring = rx_ring;
	q_vector->rx.count++;
	q_vector->rx.latency_range = I40E_LOW_LATENCY;
}

/**
 * i40evf_map_vector_to_txq - associate irqs with tx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @t_idx: queue number
 **/
static void
i40evf_map_vector_to_txq(struct i40evf_adapter *adapter, int v_idx, int t_idx)
{
	struct i40e_q_vector *q_vector = adapter->q_vector[v_idx];
	struct i40e_ring *tx_ring = adapter->tx_rings[t_idx];

	tx_ring->q_vector = q_vector;
	tx_ring->next = q_vector->tx.ring;
	tx_ring->vsi = &adapter->vsi;
	q_vector->tx.ring = tx_ring;
	q_vector->tx.count++;
	q_vector->tx.latency_range = I40E_LOW_LATENCY;
	q_vector->num_ringpairs++;
	q_vector->ring_mask |= (1 << t_idx);
}

/**
 * i40evf_map_rings_to_vectors - Maps descriptor rings to vectors
 * @adapter: board private structure to initialize
 *
 * This function maps descriptor rings to the queue-specific vectors
 * we were allotted through the MSI-X enabling code.  Ideally, we'd have
 * one vector per ring/queue, but on a constrained vector budget, we
 * group the rings as "efficiently" as possible.  You would add new
 * mapping configurations in here.
 **/
static int i40evf_map_rings_to_vectors(struct i40evf_adapter *adapter)
{
	int q_vectors;
	int v_start = 0;
	int rxr_idx = 0, txr_idx = 0;
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	int rxr_remaining = adapter->num_active_queues;
	int txr_remaining = adapter->num_active_queues;
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	int i, j;
	int rqpv, tqpv;
	int err = 0;

	q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	/* The ideal configuration...
	 * We have enough vectors to map one per queue.
	 */
	if (q_vectors == (rxr_remaining * 2)) {
		for (; rxr_idx < rxr_remaining; v_start++, rxr_idx++)
			i40evf_map_vector_to_rxq(adapter, v_start, rxr_idx);

		for (; txr_idx < txr_remaining; v_start++, txr_idx++)
			i40evf_map_vector_to_txq(adapter, v_start, txr_idx);
		goto out;
	}

	/* If we don't have enough vectors for a 1-to-1
	 * mapping, we'll have to group them so there are
	 * multiple queues per vector.
	 * Re-adjusting *qpv takes care of the remainder.
	 */
	for (i = v_start; i < q_vectors; i++) {
		rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - i);
		for (j = 0; j < rqpv; j++) {
			i40evf_map_vector_to_rxq(adapter, i, rxr_idx);
			rxr_idx++;
			rxr_remaining--;
		}
	}
	for (i = v_start; i < q_vectors; i++) {
		tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - i);
		for (j = 0; j < tqpv; j++) {
			i40evf_map_vector_to_txq(adapter, i, txr_idx);
			txr_idx++;
			txr_remaining--;
		}
	}

out:
	adapter->aq_required |= I40EVF_FLAG_AQ_MAP_VECTORS;

	return err;
}

/**
 * i40evf_request_traffic_irqs - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * Allocates MSI-X vectors for tx and rx handling, and requests
 * interrupts from the kernel.
 **/
static int
i40evf_request_traffic_irqs(struct i40evf_adapter *adapter, char *basename)
{
	int vector, err, q_vectors;
	int rx_int_idx = 0, tx_int_idx = 0;

	i40evf_irq_disable(adapter);
	/* Decrement for Other and TCP Timer vectors */
	q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (vector = 0; vector < q_vectors; vector++) {
		struct i40e_q_vector *q_vector = adapter->q_vector[vector];

		if (q_vector->tx.ring && q_vector->rx.ring) {
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "i40evf-%s-%s-%d", basename,
				 "TxRx", rx_int_idx++);
			tx_int_idx++;
		} else if (q_vector->rx.ring) {
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "i40evf-%s-%s-%d", basename,
				 "rx", rx_int_idx++);
		} else if (q_vector->tx.ring) {
			snprintf(q_vector->name, sizeof(q_vector->name) - 1,
				 "i40evf-%s-%s-%d", basename,
				 "tx", tx_int_idx++);
		} else {
			/* skip this unused q_vector */
			continue;
		}
		err = request_irq(
			adapter->msix_entries[vector + NONQ_VECS].vector,
			i40evf_msix_clean_rings,
			0,
			q_vector->name,
			q_vector);
		if (err) {
			dev_info(&adapter->pdev->dev,
				 "%s: request_irq failed, error: %d\n",
				__func__, err);
			goto free_queue_irqs;
		}
		/* assign the mask for this irq */
		irq_set_affinity_hint(
			adapter->msix_entries[vector + NONQ_VECS].vector,
			q_vector->affinity_mask);
	}

	return 0;

free_queue_irqs:
	while (vector) {
		vector--;
		irq_set_affinity_hint(
			adapter->msix_entries[vector + NONQ_VECS].vector,
			NULL);
		free_irq(adapter->msix_entries[vector + NONQ_VECS].vector,
			 adapter->q_vector[vector]);
	}
	return err;
}

/**
 * i40evf_request_misc_irq - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * Allocates MSI-X vector 0 and requests interrupts from the kernel. This
 * vector is only for the admin queue, and stays active even when the netdev
 * is closed.
 **/
static int i40evf_request_misc_irq(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err;

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	snprintf(adapter->misc_vector_name,
		 sizeof(adapter->misc_vector_name) - 1, "i40evf:mbx");
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	err = request_irq(adapter->msix_entries[0].vector,
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			  &i40evf_msix_aq, 0,
			  adapter->misc_vector_name, netdev);
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	if (err) {
		dev_err(&adapter->pdev->dev,
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			"request_irq for %s failed: %d\n",
			adapter->misc_vector_name, err);
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		free_irq(adapter->msix_entries[0].vector, netdev);
	}
	return err;
}

/**
 * i40evf_free_traffic_irqs - Free MSI-X interrupts
 * @adapter: board private structure
 *
 * Frees all MSI-X vectors other than 0.
 **/
static void i40evf_free_traffic_irqs(struct i40evf_adapter *adapter)
{
	int i;
	int q_vectors;
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	q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (i = 0; i < q_vectors; i++) {
		irq_set_affinity_hint(adapter->msix_entries[i+1].vector,
				      NULL);
		free_irq(adapter->msix_entries[i+1].vector,
			 adapter->q_vector[i]);
	}
}

/**
 * i40evf_free_misc_irq - Free MSI-X miscellaneous vector
 * @adapter: board private structure
 *
 * Frees MSI-X vector 0.
 **/
static void i40evf_free_misc_irq(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;

	free_irq(adapter->msix_entries[0].vector, netdev);
}

/**
 * i40evf_configure_tx - Configure Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void i40evf_configure_tx(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
	int i;
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	for (i = 0; i < adapter->num_active_queues; i++)
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		adapter->tx_rings[i]->tail = hw->hw_addr + I40E_QTX_TAIL1(i);
}

/**
 * i40evf_configure_rx - Configure Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void i40evf_configure_rx(struct i40evf_adapter *adapter)
{
	struct i40e_hw *hw = &adapter->hw;
	struct net_device *netdev = adapter->netdev;
	int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
	int i;
	int rx_buf_len;


	adapter->flags &= ~I40EVF_FLAG_RX_PS_CAPABLE;
	adapter->flags |= I40EVF_FLAG_RX_1BUF_CAPABLE;

	/* Decide whether to use packet split mode or not */
	if (netdev->mtu > ETH_DATA_LEN) {
		if (adapter->flags & I40EVF_FLAG_RX_PS_CAPABLE)
			adapter->flags |= I40EVF_FLAG_RX_PS_ENABLED;
		else
			adapter->flags &= ~I40EVF_FLAG_RX_PS_ENABLED;
	} else {
		if (adapter->flags & I40EVF_FLAG_RX_1BUF_CAPABLE)
			adapter->flags &= ~I40EVF_FLAG_RX_PS_ENABLED;
		else
			adapter->flags |= I40EVF_FLAG_RX_PS_ENABLED;
	}

	/* Set the RX buffer length according to the mode */
	if (adapter->flags & I40EVF_FLAG_RX_PS_ENABLED) {
		rx_buf_len = I40E_RX_HDR_SIZE;
	} else {
		if (netdev->mtu <= ETH_DATA_LEN)
			rx_buf_len = I40EVF_RXBUFFER_2048;
		else
			rx_buf_len = ALIGN(max_frame, 1024);
	}

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	for (i = 0; i < adapter->num_active_queues; i++) {
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		adapter->rx_rings[i]->tail = hw->hw_addr + I40E_QRX_TAIL1(i);
		adapter->rx_rings[i]->rx_buf_len = rx_buf_len;
	}
}

/**
 * i40evf_find_vlan - Search filter list for specific vlan filter
 * @adapter: board private structure
 * @vlan: vlan tag
 *
 * Returns ptr to the filter object or NULL
 **/
static struct
i40evf_vlan_filter *i40evf_find_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
	struct i40evf_vlan_filter *f;

	list_for_each_entry(f, &adapter->vlan_filter_list, list) {
		if (vlan == f->vlan)
			return f;
	}
	return NULL;
}

/**
 * i40evf_add_vlan - Add a vlan filter to the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 *
 * Returns ptr to the filter object or NULL when no memory available.
 **/
static struct
i40evf_vlan_filter *i40evf_add_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
	struct i40evf_vlan_filter *f;

	f = i40evf_find_vlan(adapter, vlan);
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	if (!f) {
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		f = kzalloc(sizeof(*f), GFP_ATOMIC);
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		if (!f)
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			return NULL;
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		f->vlan = vlan;

		INIT_LIST_HEAD(&f->list);
		list_add(&f->list, &adapter->vlan_filter_list);
		f->add = true;
		adapter->aq_required |= I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
	}

	return f;
}

/**
 * i40evf_del_vlan - Remove a vlan filter from the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 **/
static void i40evf_del_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
	struct i40evf_vlan_filter *f;

	f = i40evf_find_vlan(adapter, vlan);
	if (f) {
		f->remove = true;
		adapter->aq_required |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
	}
}

/**
 * i40evf_vlan_rx_add_vid - Add a VLAN filter to a device
 * @netdev: network device struct
 * @vid: VLAN tag
 **/
static int i40evf_vlan_rx_add_vid(struct net_device *netdev,
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				  __always_unused __be16 proto, u16 vid)
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{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	if (i40evf_add_vlan(adapter, vid) == NULL)
		return -ENOMEM;
	return 0;
}

/**
 * i40evf_vlan_rx_kill_vid - Remove a VLAN filter from a device
 * @netdev: network device struct
 * @vid: VLAN tag
 **/
static int i40evf_vlan_rx_kill_vid(struct net_device *netdev,
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				   __always_unused __be16 proto, u16 vid)
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{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	i40evf_del_vlan(adapter, vid);
	return 0;
}

/**
 * i40evf_find_filter - Search filter list for specific mac filter
 * @adapter: board private structure
 * @macaddr: the MAC address
 *
 * Returns ptr to the filter object or NULL
 **/
static struct
i40evf_mac_filter *i40evf_find_filter(struct i40evf_adapter *adapter,
				      u8 *macaddr)
{
	struct i40evf_mac_filter *f;

	if (!macaddr)
		return NULL;

	list_for_each_entry(f, &adapter->mac_filter_list, list) {
		if (ether_addr_equal(macaddr, f->macaddr))
			return f;
	}
	return NULL;
}

/**
 * i40e_add_filter - Add a mac filter to the filter list
 * @adapter: board private structure
 * @macaddr: the MAC address
 *
 * Returns ptr to the filter object or NULL when no memory available.
 **/
static struct
i40evf_mac_filter *i40evf_add_filter(struct i40evf_adapter *adapter,
				     u8 *macaddr)
{
	struct i40evf_mac_filter *f;

	if (!macaddr)
		return NULL;

	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
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		udelay(1);
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	f = i40evf_find_filter(adapter, macaddr);
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	if (!f) {
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		f = kzalloc(sizeof(*f), GFP_ATOMIC);
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			clear_bit(__I40EVF_IN_CRITICAL_TASK,
				  &adapter->crit_section);
			return NULL;
		}

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		ether_addr_copy(f->macaddr, macaddr);
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		list_add(&f->list, &adapter->mac_filter_list);
		f->add = true;
		adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
	}

	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
	return f;
}

/**
 * i40evf_set_mac - NDO callback to set port mac address
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/
static int i40evf_set_mac(struct net_device *netdev, void *p)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40e_hw *hw = &adapter->hw;
	struct i40evf_mac_filter *f;
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	if (ether_addr_equal(netdev->dev_addr, addr->sa_data))
		return 0;

	f = i40evf_add_filter(adapter, addr->sa_data);
	if (f) {
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		ether_addr_copy(hw->mac.addr, addr->sa_data);
		ether_addr_copy(netdev->dev_addr, adapter->hw.mac.addr);
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	}

	return (f == NULL) ? -ENOMEM : 0;
}

/**
 * i40evf_set_rx_mode - NDO callback to set the netdev filters
 * @netdev: network interface device structure
 **/
static void i40evf_set_rx_mode(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40evf_mac_filter *f, *ftmp;
	struct netdev_hw_addr *uca;
	struct netdev_hw_addr *mca;

	/* add addr if not already in the filter list */
	netdev_for_each_uc_addr(uca, netdev) {
		i40evf_add_filter(adapter, uca->addr);
	}
	netdev_for_each_mc_addr(mca, netdev) {
		i40evf_add_filter(adapter, mca->addr);
	}

	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
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		udelay(1);
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	/* remove filter if not in netdev list */
	list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
		bool found = false;

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		if (is_multicast_ether_addr(f->macaddr)) {
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			netdev_for_each_mc_addr(mca, netdev) {
				if (ether_addr_equal(mca->addr, f->macaddr)) {
					found = true;
					break;
				}
			}
		} else {
			netdev_for_each_uc_addr(uca, netdev) {
				if (ether_addr_equal(uca->addr, f->macaddr)) {
					found = true;
					break;
				}
			}
		}
		if (found) {
			f->remove = true;
			adapter->aq_required |= I40EVF_FLAG_AQ_DEL_MAC_FILTER;
		}
	}
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
}

/**
 * i40evf_napi_enable_all - enable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void i40evf_napi_enable_all(struct i40evf_adapter *adapter)
{
	int q_idx;
	struct i40e_q_vector *q_vector;
	int q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (q_idx = 0; q_idx < q_vectors; q_idx++) {
		struct napi_struct *napi;
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		q_vector = adapter->q_vector[q_idx];
		napi = &q_vector->napi;
		napi_enable(napi);
	}
}

/**
 * i40evf_napi_disable_all - disable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void i40evf_napi_disable_all(struct i40evf_adapter *adapter)
{
	int q_idx;
	struct i40e_q_vector *q_vector;
	int q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (q_idx = 0; q_idx < q_vectors; q_idx++) {
		q_vector = adapter->q_vector[q_idx];
		napi_disable(&q_vector->napi);
	}
}

/**
 * i40evf_configure - set up transmit and receive data structures
 * @adapter: board private structure
 **/
static void i40evf_configure(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int i;

	i40evf_set_rx_mode(netdev);

	i40evf_configure_tx(adapter);
	i40evf_configure_rx(adapter);
	adapter->aq_required |= I40EVF_FLAG_AQ_CONFIGURE_QUEUES;

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	for (i = 0; i < adapter->num_active_queues; i++) {
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		struct i40e_ring *ring = adapter->rx_rings[i];
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		i40evf_alloc_rx_buffers(ring, ring->count);
		ring->next_to_use = ring->count - 1;
		writel(ring->next_to_use, ring->tail);
	}
}

/**
 * i40evf_up_complete - Finish the last steps of bringing up a connection
 * @adapter: board private structure
 **/
static int i40evf_up_complete(struct i40evf_adapter *adapter)
{
	adapter->state = __I40EVF_RUNNING;
	clear_bit(__I40E_DOWN, &adapter->vsi.state);

	i40evf_napi_enable_all(adapter);

	adapter->aq_required |= I40EVF_FLAG_AQ_ENABLE_QUEUES;
	mod_timer_pending(&adapter->watchdog_timer, jiffies + 1);
	return 0;
}

/**
 * i40e_down - Shutdown the connection processing
 * @adapter: board private structure
 **/
void i40evf_down(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct i40evf_mac_filter *f;

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	if (adapter->state == __I40EVF_DOWN)
		return;

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	/* remove all MAC filters */
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	list_for_each_entry(f, &adapter->mac_filter_list, list) {
		f->remove = true;
	}
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	/* remove all VLAN filters */
	list_for_each_entry(f, &adapter->vlan_filter_list, list) {
		f->remove = true;
	}
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	if (!(adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) &&
	    adapter->state != __I40EVF_RESETTING) {
		adapter->aq_required |= I40EVF_FLAG_AQ_DEL_MAC_FILTER;
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		adapter->aq_required |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
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		/* disable receives */
		adapter->aq_required |= I40EVF_FLAG_AQ_DISABLE_QUEUES;
		mod_timer_pending(&adapter->watchdog_timer, jiffies + 1);
		msleep(20);
	}
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	netif_tx_disable(netdev);

	netif_tx_stop_all_queues(netdev);

	i40evf_irq_disable(adapter);

	i40evf_napi_disable_all(adapter);

	netif_carrier_off(netdev);
}

/**
 * i40evf_acquire_msix_vectors - Setup the MSIX capability
 * @adapter: board private structure
 * @vectors: number of vectors to request
 *
 * Work with the OS to set up the MSIX vectors needed.
 *
 * Returns 0 on success, negative on failure
 **/
static int
i40evf_acquire_msix_vectors(struct i40evf_adapter *adapter, int vectors)
{
	int err, vector_threshold;

	/* We'll want at least 3 (vector_threshold):
	 * 0) Other (Admin Queue and link, mostly)
	 * 1) TxQ[0] Cleanup
	 * 2) RxQ[0] Cleanup
	 */
	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.
	 */
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	err = pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
				    vector_threshold, vectors);
	if (err < 0) {
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		dev_err(&adapter->pdev->dev, "Unable to allocate MSI-X interrupts\n");
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		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
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		return err;
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	}
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	/* Adjust for only the vectors we'll use, which is minimum
	 * of max_msix_q_vectors + NONQ_VECS, or the number of
	 * vectors we were allocated.
	 */
	adapter->num_msix_vectors = err;
	return 0;
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}

/**
 * i40evf_free_queues - Free memory for all rings
 * @adapter: board private structure to initialize
 *
 * Free all of the memory associated with queue pairs.
 **/
static void i40evf_free_queues(struct i40evf_adapter *adapter)
{
	int i;

	if (!adapter->vsi_res)
		return;
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	for (i = 0; i < adapter->num_active_queues; i++) {
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		if (adapter->tx_rings[i])
			kfree_rcu(adapter->tx_rings[i], rcu);
		adapter->tx_rings[i] = NULL;
		adapter->rx_rings[i] = NULL;
	}
}

/**
 * i40evf_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 * We allocate one ring per queue at run-time since we don't know the
 * number of queues at compile-time.  The polling_netdev array is
 * intended for Multiqueue, but should work fine with a single queue.
 **/
static int i40evf_alloc_queues(struct i40evf_adapter *adapter)
{
	int i;

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	for (i = 0; i < adapter->num_active_queues; i++) {
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		struct i40e_ring *tx_ring;
		struct i40e_ring *rx_ring;

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		tx_ring = kzalloc(sizeof(*tx_ring) * 2, GFP_KERNEL);
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		if (!tx_ring)
			goto err_out;

		tx_ring->queue_index = i;
		tx_ring->netdev = adapter->netdev;
		tx_ring->dev = &adapter->pdev->dev;
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		tx_ring->count = adapter->tx_desc_count;
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		adapter->tx_rings[i] = tx_ring;

		rx_ring = &tx_ring[1];
		rx_ring->queue_index = i;
		rx_ring->netdev = adapter->netdev;
		rx_ring->dev = &adapter->pdev->dev;
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		rx_ring->count = adapter->rx_desc_count;
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		adapter->rx_rings[i] = rx_ring;
	}

	return 0;

err_out:
	i40evf_free_queues(adapter);
	return -ENOMEM;
}

/**
 * i40evf_set_interrupt_capability - set MSI-X or FAIL if not supported
 * @adapter: board private structure to initialize
 *
 * Attempt to configure the interrupts using the best available
 * capabilities of the hardware and the kernel.
 **/
static int i40evf_set_interrupt_capability(struct i40evf_adapter *adapter)
{
	int vector, v_budget;
	int pairs = 0;
	int err = 0;

	if (!adapter->vsi_res) {
		err = -EIO;
		goto out;
	}
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	pairs = adapter->num_active_queues;
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	/* 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) twice the number of vectors as there are CPU's.
	 */
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	v_budget = min_t(int, pairs, (int)(num_online_cpus() * 2)) + NONQ_VECS;
	v_budget = min_t(int, v_budget, (int)adapter->vf_res->max_vectors);
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	adapter->msix_entries = kcalloc(v_budget,
					sizeof(struct msix_entry), GFP_KERNEL);
	if (!adapter->msix_entries) {
		err = -ENOMEM;
		goto out;
	}

	for (vector = 0; vector < v_budget; vector++)
		adapter->msix_entries[vector].entry = vector;

	i40evf_acquire_msix_vectors(adapter, v_budget);

out:
	adapter->netdev->real_num_tx_queues = pairs;
	return err;
}

/**
 * i40evf_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 i40evf_alloc_q_vectors(struct i40evf_adapter *adapter)
{
	int q_idx, num_q_vectors;
	struct i40e_q_vector *q_vector;

	num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;

	for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
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		q_vector = kzalloc(sizeof(*q_vector), GFP_KERNEL);
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		if (!q_vector)
			goto err_out;
		q_vector->adapter = adapter;
		q_vector->vsi = &adapter->vsi;
		q_vector->v_idx = q_idx;
		netif_napi_add(adapter->netdev, &q_vector->napi,
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			       i40evf_napi_poll, NAPI_POLL_WEIGHT);
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		adapter->q_vector[q_idx] = q_vector;
	}

	return 0;

err_out:
	while (q_idx) {
		q_idx--;
		q_vector = adapter->q_vector[q_idx];
		netif_napi_del(&q_vector->napi);
		kfree(q_vector);
		adapter->q_vector[q_idx] = NULL;
	}
	return -ENOMEM;
}

/**
 * i40evf_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 i40evf_free_q_vectors(struct i40evf_adapter *adapter)
{
	int q_idx, num_q_vectors;
	int napi_vectors;

	num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;
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	napi_vectors = adapter->num_active_queues;
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	for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
		struct i40e_q_vector *q_vector = adapter->q_vector[q_idx];

		adapter->q_vector[q_idx] = NULL;
		if (q_idx < napi_vectors)
			netif_napi_del(&q_vector->napi);
		kfree(q_vector);
	}
}

/**
 * i40evf_reset_interrupt_capability - Reset MSIX setup
 * @adapter: board private structure
 *
 **/
void i40evf_reset_interrupt_capability(struct i40evf_adapter *adapter)
{
	pci_disable_msix(adapter->pdev);
	kfree(adapter->msix_entries);
	adapter->msix_entries = NULL;
}

/**
 * i40evf_init_interrupt_scheme - Determine if MSIX is supported and init
 * @adapter: board private structure to initialize
 *
 **/
int i40evf_init_interrupt_scheme(struct i40evf_adapter *adapter)
{
	int err;

	err = i40evf_set_interrupt_capability(adapter);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"Unable to setup interrupt capabilities\n");
		goto err_set_interrupt;
	}

	err = i40evf_alloc_q_vectors(adapter);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"Unable to allocate memory for queue vectors\n");
		goto err_alloc_q_vectors;
	}

	err = i40evf_alloc_queues(adapter);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"Unable to allocate memory for queues\n");
		goto err_alloc_queues;
	}

	dev_info(&adapter->pdev->dev, "Multiqueue %s: Queue pair count = %u",
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		 (adapter->num_active_queues > 1) ? "Enabled" : "Disabled",
		 adapter->num_active_queues);
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	return 0;
err_alloc_queues:
	i40evf_free_q_vectors(adapter);
err_alloc_q_vectors:
	i40evf_reset_interrupt_capability(adapter);
err_set_interrupt:
	return err;
}

/**
 * i40evf_watchdog_timer - Periodic call-back timer
 * @data: pointer to adapter disguised as unsigned long
 **/
static void i40evf_watchdog_timer(unsigned long data)
{
	struct i40evf_adapter *adapter = (struct i40evf_adapter *)data;
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	schedule_work(&adapter->watchdog_task);
	/* timer will be rescheduled in watchdog task */
}

/**
 * i40evf_watchdog_task - Periodic call-back task
 * @work: pointer to work_struct
 **/
static void i40evf_watchdog_task(struct work_struct *work)
{
	struct i40evf_adapter *adapter = container_of(work,
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						      struct i40evf_adapter,
						      watchdog_task);
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	struct i40e_hw *hw = &adapter->hw;
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	uint32_t rstat_val;
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	if (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section))
		goto restart_watchdog;

	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
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		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
		if ((rstat_val == I40E_VFR_VFACTIVE) ||
		    (rstat_val == I40E_VFR_COMPLETED)) {
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			/* A chance for redemption! */
			dev_err(&adapter->pdev->dev, "Hardware came out of reset. Attempting reinit.\n");
			adapter->state = __I40EVF_STARTUP;
			adapter->flags &= ~I40EVF_FLAG_PF_COMMS_FAILED;
			schedule_delayed_work(&adapter->init_task, 10);
			clear_bit(__I40EVF_IN_CRITICAL_TASK,
				  &adapter->crit_section);
			/* Don't reschedule the watchdog, since we've restarted
			 * the init task. When init_task contacts the PF and
			 * gets everything set up again, it'll restart the
			 * watchdog for us. Down, boy. Sit. Stay. Woof.
			 */
			return;
		}
		adapter->aq_pending = 0;
		adapter->aq_required = 0;
		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
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		goto watchdog_done;
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	}
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	if ((adapter->state < __I40EVF_DOWN) ||
	    (adapter->flags & I40EVF_FLAG_RESET_PENDING))
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		goto watchdog_done;

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	/* check for reset */
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	rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
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		    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
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	if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING) &&
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	    (rstat_val != I40E_VFR_VFACTIVE) &&
	    (rstat_val != I40E_VFR_COMPLETED)) {
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		adapter->state = __I40EVF_RESETTING;
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		adapter->flags |= I40EVF_FLAG_RESET_PENDING;
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		dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
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		schedule_work(&adapter->reset_task);
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		adapter->aq_pending = 0;
		adapter->aq_required = 0;
		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
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		goto watchdog_done;
	}

	/* Process admin queue tasks. After init, everything gets done
	 * here so we don't race on the admin queue.
	 */
	if (adapter->aq_pending)
		goto watchdog_done;

	if (adapter->aq_required & I40EVF_FLAG_AQ_MAP_VECTORS) {
		i40evf_map_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_ADD_MAC_FILTER) {
		i40evf_add_ether_addrs(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_ADD_VLAN_FILTER) {
		i40evf_add_vlans(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_DEL_MAC_FILTER) {
		i40evf_del_ether_addrs(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_DEL_VLAN_FILTER) {
		i40evf_del_vlans(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_DISABLE_QUEUES) {
		i40evf_disable_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_CONFIGURE_QUEUES) {
		i40evf_configure_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->aq_required & I40EVF_FLAG_AQ_ENABLE_QUEUES) {
		i40evf_enable_queues(adapter);
		goto watchdog_done;
	}

	if (adapter->state == __I40EVF_RUNNING)
		i40evf_request_stats(adapter);

	i40evf_irq_enable(adapter, true);
	i40evf_fire_sw_int(adapter, 0xFF);
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watchdog_done:
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	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
restart_watchdog:
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	if (adapter->state == __I40EVF_REMOVE)
		return;
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	if (adapter->aq_required)
		mod_timer(&adapter->watchdog_timer,
			  jiffies + msecs_to_jiffies(20));
	else
		mod_timer(&adapter->watchdog_timer, jiffies + (HZ * 2));
	schedule_work(&adapter->adminq_task);
}

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/**
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 * next_queue - increment to next available tx queue
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 * @adapter: board private structure
 * @j: queue counter
 *
 * Helper function for RSS programming to increment through available
 * queus. Returns the next queue value.
 **/
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static int next_queue(struct i40evf_adapter *adapter, int j)
{
	j += 1;

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	return j >= adapter->num_active_queues ? 0 : j;
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}

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/**
 * i40evf_configure_rss - Prepare for RSS if used
 * @adapter: board private structure
 **/
static void i40evf_configure_rss(struct i40evf_adapter *adapter)
{
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	u32 rss_key[I40E_VFQF_HKEY_MAX_INDEX + 1];
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	struct i40e_hw *hw = &adapter->hw;
	u32 lut = 0;
	int i, j;
	u64 hena;

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	/* No RSS for single queue. */
	if (adapter->num_active_queues == 1) {
		wr32(hw, I40E_VFQF_HENA(0), 0);
		wr32(hw, I40E_VFQF_HENA(1), 0);
		return;
	}
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	/* Hash type is configured by the PF - we just supply the key */
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	netdev_rss_key_fill(rss_key, sizeof(rss_key));
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	for (i = 0; i <= I40E_VFQF_HKEY_MAX_INDEX; i++)
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		wr32(hw, I40E_VFQF_HKEY(i), rss_key[i]);
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	/* Enable PCTYPES for RSS, TCP/UDP with IPv4/IPv6 */
	hena = I40E_DEFAULT_RSS_HENA;
	wr32(hw, I40E_VFQF_HENA(0), (u32)hena);
	wr32(hw, I40E_VFQF_HENA(1), (u32)(hena >> 32));

	/* Populate the LUT with max no. of queues in round robin fashion */
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	j = adapter->num_active_queues;
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	for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
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		j = next_queue(adapter, j);
		lut = j;
		j = next_queue(adapter, j);
		lut |= j << 8;
		j = next_queue(adapter, j);
		lut |= j << 16;
		j = next_queue(adapter, j);
		lut |= j << 24;
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		wr32(hw, I40E_VFQF_HLUT(i), lut);
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	}
	i40e_flush(hw);
}

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#define I40EVF_RESET_WAIT_MS 100
#define I40EVF_RESET_WAIT_COUNT 200
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/**
 * i40evf_reset_task - Call-back task to handle hardware reset
 * @work: pointer to work_struct
 *
 * During reset we need to shut down and reinitialize the admin queue
 * before we can use it to communicate with the PF again. We also clear
 * and reinit the rings because that context is lost as well.
 **/
static void i40evf_reset_task(struct work_struct *work)
{
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	struct i40evf_adapter *adapter = container_of(work,
						      struct i40evf_adapter,
						      reset_task);
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	struct i40e_hw *hw = &adapter->hw;
	int i = 0, err;
	uint32_t rstat_val;

	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
				&adapter->crit_section))
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		usleep_range(500, 1000);
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	if (adapter->flags & I40EVF_FLAG_RESET_NEEDED) {
		dev_info(&adapter->pdev->dev, "Requesting reset from PF\n");
		i40evf_request_reset(adapter);
	}

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	/* poll until we see the reset actually happen */
	for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) {
		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
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		if ((rstat_val != I40E_VFR_VFACTIVE) &&
		    (rstat_val != I40E_VFR_COMPLETED))
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			break;
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		msleep(I40EVF_RESET_WAIT_MS);
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	}
	if (i == I40EVF_RESET_WAIT_COUNT) {
		adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
		goto continue_reset; /* act like the reset happened */
	}
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	/* wait until the reset is complete and the PF is responding to us */
	for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) {
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		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
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		if ((rstat_val == I40E_VFR_VFACTIVE) ||
		    (rstat_val == I40E_VFR_COMPLETED))
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			break;
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		msleep(I40EVF_RESET_WAIT_MS);
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	}
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	if (i == I40EVF_RESET_WAIT_COUNT) {
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		struct i40evf_mac_filter *f, *ftmp;
		struct i40evf_vlan_filter *fv, *fvtmp;

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		/* reset never finished */
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		dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",
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			rstat_val);
		adapter->flags |= I40EVF_FLAG_PF_COMMS_FAILED;

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		if (netif_running(adapter->netdev)) {
			set_bit(__I40E_DOWN, &adapter->vsi.state);
			i40evf_down(adapter);
			i40evf_free_traffic_irqs(adapter);
			i40evf_free_all_tx_resources(adapter);
			i40evf_free_all_rx_resources(adapter);
		}
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		/* Delete all of the filters, both MAC and VLAN. */
		list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list,
					 list) {
			list_del(&f->list);
			kfree(f);
		}
		list_for_each_entry_safe(fv, fvtmp, &adapter->vlan_filter_list,
					 list) {
			list_del(&fv->list);
			kfree(fv);
		}

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		i40evf_free_misc_irq(adapter);
		i40evf_reset_interrupt_capability(adapter);
		i40evf_free_queues(adapter);
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		kfree(adapter->vf_res);
		i40evf_shutdown_adminq(hw);
		adapter->netdev->flags &= ~IFF_UP;
		clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
		return; /* Do not attempt to reinit. It's dead, Jim. */
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	}
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continue_reset:
	adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;

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	i40evf_down(adapter);
	adapter->state = __I40EVF_RESETTING;

	/* kill and reinit the admin queue */
	if (i40evf_shutdown_adminq(hw))
		dev_warn(&adapter->pdev->dev,
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			 "%s: Failed to destroy the Admin Queue resources\n",
			 __func__);
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	err = i40evf_init_adminq(hw);
	if (err)
		dev_info(&adapter->pdev->dev, "%s: init_adminq failed: %d\n",
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			 __func__, err);
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	adapter->aq_pending = 0;
	adapter->aq_required = 0;
	i40evf_map_queues(adapter);
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);

	mod_timer(&adapter->watchdog_timer, jiffies + 2);

	if (netif_running(adapter->netdev)) {
		/* allocate transmit descriptors */
		err = i40evf_setup_all_tx_resources(adapter);
		if (err)
			goto reset_err;

		/* allocate receive descriptors */
		err = i40evf_setup_all_rx_resources(adapter);
		if (err)
			goto reset_err;

		i40evf_configure(adapter);

		err = i40evf_up_complete(adapter);
		if (err)
			goto reset_err;

		i40evf_irq_enable(adapter, true);
	}
	return;
reset_err:
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	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
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	i40evf_close(adapter->netdev);
}

/**
 * i40evf_adminq_task - worker thread to clean the admin queue
 * @work: pointer to work_struct containing our data
 **/
static void i40evf_adminq_task(struct work_struct *work)
{
	struct i40evf_adapter *adapter =
		container_of(work, struct i40evf_adapter, adminq_task);
	struct i40e_hw *hw = &adapter->hw;
	struct i40e_arq_event_info event;
	struct i40e_virtchnl_msg *v_msg;
	i40e_status ret;
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	u32 val, oldval;
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	u16 pending;

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	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED)
		return;

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	event.buf_len = I40EVF_MAX_AQ_BUF_SIZE;
	event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);
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	if (!event.msg_buf)
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		return;
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	v_msg = (struct i40e_virtchnl_msg *)&event.desc;
	do {
		ret = i40evf_clean_arq_element(hw, &event, &pending);
		if (ret)
			break; /* No event to process or error cleaning ARQ */

		i40evf_virtchnl_completion(adapter, v_msg->v_opcode,
					   v_msg->v_retval, event.msg_buf,
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					   event.msg_len);
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		if (pending != 0)
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			memset(event.msg_buf, 0, I40EVF_MAX_AQ_BUF_SIZE);
	} while (pending);

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	/* check for error indications */
	val = rd32(hw, hw->aq.arq.len);
	oldval = val;
	if (val & I40E_VF_ARQLEN_ARQVFE_MASK) {
		dev_info(&adapter->pdev->dev, "ARQ VF Error detected\n");
		val &= ~I40E_VF_ARQLEN_ARQVFE_MASK;
	}
	if (val & I40E_VF_ARQLEN_ARQOVFL_MASK) {
		dev_info(&adapter->pdev->dev, "ARQ Overflow Error detected\n");
		val &= ~I40E_VF_ARQLEN_ARQOVFL_MASK;
	}
	if (val & I40E_VF_ARQLEN_ARQCRIT_MASK) {
		dev_info(&adapter->pdev->dev, "ARQ Critical Error detected\n");
		val &= ~I40E_VF_ARQLEN_ARQCRIT_MASK;
	}
	if (oldval != val)
		wr32(hw, hw->aq.arq.len, val);

	val = rd32(hw, hw->aq.asq.len);
	oldval = val;
	if (val & I40E_VF_ATQLEN_ATQVFE_MASK) {
		dev_info(&adapter->pdev->dev, "ASQ VF Error detected\n");
		val &= ~I40E_VF_ATQLEN_ATQVFE_MASK;
	}
	if (val & I40E_VF_ATQLEN_ATQOVFL_MASK) {
		dev_info(&adapter->pdev->dev, "ASQ Overflow Error detected\n");
		val &= ~I40E_VF_ATQLEN_ATQOVFL_MASK;
	}
	if (val & I40E_VF_ATQLEN_ATQCRIT_MASK) {
		dev_info(&adapter->pdev->dev, "ASQ Critical Error detected\n");
		val &= ~I40E_VF_ATQLEN_ATQCRIT_MASK;
	}
	if (oldval != val)
		wr32(hw, hw->aq.asq.len, val);

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	/* re-enable Admin queue interrupt cause */
	i40evf_misc_irq_enable(adapter);

	kfree(event.msg_buf);
}

/**
 * i40evf_free_all_tx_resources - Free Tx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/
static void i40evf_free_all_tx_resources(struct i40evf_adapter *adapter)
{
	int i;

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	for (i = 0; i < adapter->num_active_queues; i++)
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		if (adapter->tx_rings[i]->desc)
			i40evf_free_tx_resources(adapter->tx_rings[i]);
}

/**
 * i40evf_setup_all_tx_resources - allocate all queues Tx resources
 * @adapter: board private structure
 *
 * If this function returns with an error, then it's possible one or
 * more of the rings is populated (while the rest are not).  It is the
 * callers duty to clean those orphaned rings.
 *
 * Return 0 on success, negative on failure
 **/
static int i40evf_setup_all_tx_resources(struct i40evf_adapter *adapter)
{
	int i, err = 0;

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	for (i = 0; i < adapter->num_active_queues; i++) {
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		adapter->tx_rings[i]->count = adapter->tx_desc_count;
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		err = i40evf_setup_tx_descriptors(adapter->tx_rings[i]);
		if (!err)
			continue;
		dev_err(&adapter->pdev->dev,
			"%s: Allocation for Tx Queue %u failed\n",
			__func__, i);
		break;
	}

	return err;
}

/**
 * i40evf_setup_all_rx_resources - allocate all queues Rx resources
 * @adapter: board private structure
 *
 * If this function returns with an error, then it's possible one or
 * more of the rings is populated (while the rest are not).  It is the
 * callers duty to clean those orphaned rings.
 *
 * Return 0 on success, negative on failure
 **/
static int i40evf_setup_all_rx_resources(struct i40evf_adapter *adapter)
{
	int i, err = 0;

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	for (i = 0; i < adapter->num_active_queues; i++) {
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		adapter->rx_rings[i]->count = adapter->rx_desc_count;
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		err = i40evf_setup_rx_descriptors(adapter->rx_rings[i]);
		if (!err)
			continue;
		dev_err(&adapter->pdev->dev,
			"%s: Allocation for Rx Queue %u failed\n",
			__func__, i);
		break;
	}
	return err;
}

/**
 * i40evf_free_all_rx_resources - Free Rx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/
static void i40evf_free_all_rx_resources(struct i40evf_adapter *adapter)
{
	int i;

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		if (adapter->rx_rings[i]->desc)
			i40evf_free_rx_resources(adapter->rx_rings[i]);
}

/**
 * i40evf_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/
static int i40evf_open(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	int err;

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	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
		dev_err(&adapter->pdev->dev, "Unable to open device due to PF driver failure.\n");
		return -EIO;
	}
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	if (adapter->state != __I40EVF_DOWN)
		return -EBUSY;

	/* allocate transmit descriptors */
	err = i40evf_setup_all_tx_resources(adapter);
	if (err)
		goto err_setup_tx;

	/* allocate receive descriptors */
	err = i40evf_setup_all_rx_resources(adapter);
	if (err)
		goto err_setup_rx;

	/* clear any pending interrupts, may auto mask */
	err = i40evf_request_traffic_irqs(adapter, netdev->name);
	if (err)
		goto err_req_irq;

	i40evf_configure(adapter);

	err = i40evf_up_complete(adapter);
	if (err)
		goto err_req_irq;

	i40evf_irq_enable(adapter, true);

	return 0;

err_req_irq:
	i40evf_down(adapter);
	i40evf_free_traffic_irqs(adapter);
err_setup_rx:
	i40evf_free_all_rx_resources(adapter);
err_setup_tx:
	i40evf_free_all_tx_resources(adapter);

	return err;
}

/**
 * i40evf_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled. All IRQs except vector 0 (reserved for admin queue)
 * are freed, along with all transmit and receive resources.
 **/
static int i40evf_close(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

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	if (adapter->state <= __I40EVF_DOWN)
		return 0;


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	set_bit(__I40E_DOWN, &adapter->vsi.state);

	i40evf_down(adapter);
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	adapter->state = __I40EVF_DOWN;
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	i40evf_free_traffic_irqs(adapter);

	i40evf_free_all_tx_resources(adapter);
	i40evf_free_all_rx_resources(adapter);

	return 0;
}

/**
 * i40evf_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 *
 * Returns the address of the device statistics structure.
 * The statistics are actually updated from the timer callback.
 **/
static struct net_device_stats *i40evf_get_stats(struct net_device *netdev)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);

	/* only return the current stats */
	return &adapter->net_stats;
}

/**
 * i40evf_reinit_locked - Software reinit
 * @adapter: board private structure
 *
 * Reinititalizes the ring structures in response to a software configuration
 * change. Roughly the same as close followed by open, but skips releasing
 * and reallocating the interrupts.
 **/
void i40evf_reinit_locked(struct i40evf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err;

	WARN_ON(in_interrupt());

	i40evf_down(adapter);

	/* allocate transmit descriptors */
	err = i40evf_setup_all_tx_resources(adapter);
	if (err)
		goto err_reinit;

	/* allocate receive descriptors */
	err = i40evf_setup_all_rx_resources(adapter);
	if (err)
		goto err_reinit;

	i40evf_configure(adapter);

	err = i40evf_up_complete(adapter);
	if (err)
		goto err_reinit;

	i40evf_irq_enable(adapter, true);
	return;

err_reinit:
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	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
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	i40evf_close(netdev);
}

/**
 * i40evf_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 **/
static int i40evf_change_mtu(struct net_device *netdev, int new_mtu)
{
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;

	if ((new_mtu < 68) || (max_frame > I40E_MAX_RXBUFFER))
		return -EINVAL;

	/* must set new MTU before calling down or up */
	netdev->mtu = new_mtu;
	i40evf_reinit_locked(adapter);
	return 0;
}

static const struct net_device_ops i40evf_netdev_ops = {
	.ndo_open		= i40evf_open,
	.ndo_stop		= i40evf_close,
	.ndo_start_xmit		= i40evf_xmit_frame,
	.ndo_get_stats		= i40evf_get_stats,
	.ndo_set_rx_mode	= i40evf_set_rx_mode,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= i40evf_set_mac,
	.ndo_change_mtu		= i40evf_change_mtu,
	.ndo_tx_timeout		= i40evf_tx_timeout,
	.ndo_vlan_rx_add_vid	= i40evf_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid	= i40evf_vlan_rx_kill_vid,
};

/**
 * i40evf_check_reset_complete - check that VF reset is complete
 * @hw: pointer to hw struct
 *
 * Returns 0 if device is ready to use, or -EBUSY if it's in reset.
 **/
static int i40evf_check_reset_complete(struct i40e_hw *hw)
{
	u32 rstat;
	int i;

	for (i = 0; i < 100; i++) {
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		rstat = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
		if ((rstat == I40E_VFR_VFACTIVE) ||
		    (rstat == I40E_VFR_COMPLETED))
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			return 0;
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		usleep_range(10, 20);
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	}
	return -EBUSY;
}

/**
 * i40evf_init_task - worker thread to perform delayed initialization
 * @work: pointer to work_struct containing our data
 *
 * This task completes the work that was begun in probe. Due to the nature
 * of VF-PF communications, we may need to wait tens of milliseconds to get
 * reponses back from the PF. Rather than busy-wait in probe and bog down the
 * whole system, we'll do it in a task so we can sleep.
 * This task only runs during driver init. Once we've established
 * communications with the PF driver and set up our netdev, the watchdog
 * takes over.
 **/
static void i40evf_init_task(struct work_struct *work)
{
	struct i40evf_adapter *adapter = container_of(work,
						      struct i40evf_adapter,
						      init_task.work);
	struct net_device *netdev = adapter->netdev;
	struct i40evf_mac_filter *f;
	struct i40e_hw *hw = &adapter->hw;
	struct pci_dev *pdev = adapter->pdev;
	int i, err, bufsz;

	switch (adapter->state) {
	case __I40EVF_STARTUP:
		/* driver loaded, probe complete */
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		adapter->flags &= ~I40EVF_FLAG_PF_COMMS_FAILED;
		adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
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		err = i40e_set_mac_type(hw);
		if (err) {
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			dev_err(&pdev->dev