drivers/net/ethernet/intel/i40evf/i40evf_main.c

/*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
 * Copyright(c) 2013 - 2014 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.
 *
 * 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);
static int i40evf_close(struct net_device *netdev);

char i40evf_driver_name[] = "i40evf";
static const char i40evf_driver_string[] =
	"Intel(R) XL710 X710 Virtual Function Network Driver";

#define DRV_VERSION "0.9.11"
const char i40evf_driver_version[] = DRV_VERSION;
static const char i40evf_copyright[] =
	"Copyright (c) 2013 Intel Corporation.";

/* 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) }
 */
static DEFINE_PCI_DEVICE_TABLE(i40evf_pci_tbl) = {
	{PCI_VDEVICE(INTEL, I40E_DEV_ID_VF), 0},
	/* 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++;

	/* Do the reset outside of interrupt context */
	schedule_work(&adapter->reset_task);
}

/**
 * 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;
	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;
	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;

	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
 **/
static void i40evf_fire_sw_int(struct i40evf_adapter *adapter,
					    u32 mask)
{
	struct i40e_hw *hw = &adapter->hw;
	int i;
	uint32_t dyn_ctl;

	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;

	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;
	int rxr_remaining = adapter->vsi_res->num_queue_pairs;
	int txr_remaining = adapter->vsi_res->num_queue_pairs;
	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;

	sprintf(adapter->misc_vector_name, "i40evf:mbx");
	err = request_irq(adapter->msix_entries[0].vector,
			  &i40evf_msix_aq, 0,
			  adapter->misc_vector_name, netdev);
	if (err) {
		dev_err(&adapter->pdev->dev,
			"request_irq for msix_aq failed: %d\n", err);
		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;
	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;
	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++)
		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);
	}

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
		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);
	if (NULL == f) {
		f = kzalloc(sizeof(*f), GFP_ATOMIC);
		if (NULL == f) {
			dev_info(&adapter->pdev->dev,
				 "%s: no memory for new VLAN filter\n",
				 __func__);
			return NULL;
		}
		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;
	}
	return;
}

/**
 * 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,
			 __always_unused __be16 proto, u16 vid)
{
	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,
			  __always_unused __be16 proto, u16 vid)
{
	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))
		mdelay(1);

	f = i40evf_find_filter(adapter, macaddr);
	if (NULL == f) {
		f = kzalloc(sizeof(*f), GFP_ATOMIC);
		if (NULL == f) {
			dev_info(&adapter->pdev->dev,
				 "%s: no memory for new filter\n", __func__);
			clear_bit(__I40EVF_IN_CRITICAL_TASK,
				  &adapter->crit_section);
			return NULL;
		}

		memcpy(f->macaddr, macaddr, ETH_ALEN);

		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) {
		memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);
		memcpy(netdev->dev_addr, adapter->hw.mac.addr,
		       netdev->addr_len);
	}

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

		if (f->macaddr[0] & 0x01) {
			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;
		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;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
		struct i40e_ring *ring = adapter->rx_rings[i];
		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;
}

/**
 * i40evf_clean_all_rx_rings - Free Rx Buffers for all queues
 * @adapter: board private structure
 **/
static void i40evf_clean_all_rx_rings(struct i40evf_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++)
		i40evf_clean_rx_ring(adapter->rx_rings[i]);
}

/**
 * i40evf_clean_all_tx_rings - Free Tx Buffers for all queues
 * @adapter: board private structure
 **/
static void i40evf_clean_all_tx_rings(struct i40evf_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++)
		i40evf_clean_tx_ring(adapter->tx_rings[i]);
}

/**
 * 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;

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

	netif_tx_stop_all_queues(netdev);

	i40evf_irq_disable(adapter);

	i40evf_napi_disable_all(adapter);

	netif_carrier_off(netdev);

	i40evf_clean_all_tx_rings(adapter);
	i40evf_clean_all_rx_rings(adapter);
}

/**
 * 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.
	 */
	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) {
		dev_err(&adapter->pdev->dev, "Unable to allocate MSI-X interrupts.\n");
		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
		err = -EIO;
	} else {
		/* 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 = vectors;
	}
	return err;
}

/**
 * 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;
	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
		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;

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

		tx_ring = kzalloc(sizeof(struct i40e_ring) * 2, GFP_KERNEL);
		if (!tx_ring)
			goto err_out;

		tx_ring->queue_index = i;
		tx_ring->netdev = adapter->netdev;
		tx_ring->dev = &adapter->pdev->dev;
		tx_ring->count = I40EVF_DEFAULT_TXD;
		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;
		rx_ring->count = I40EVF_DEFAULT_RXD;
		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;
	}
	pairs = adapter->vsi_res->num_queue_pairs;

	/* 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.
	 */
	v_budget = min(pairs, (int)(num_online_cpus() * 2)) + NONQ_VECS;
	v_budget = min(v_budget, (int)adapter->vf_res->max_vectors + 1);

	/* 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) {
		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++) {
		q_vector = kzalloc(sizeof(struct i40e_q_vector), GFP_KERNEL);
		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,
				       i40evf_napi_poll, 64);
		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;
	napi_vectors = adapter->vsi_res->num_queue_pairs;

	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;

	return;
}

/**
 * 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",
		(adapter->vsi_res->num_queue_pairs > 1) ? "Enabled" :
		"Disabled", adapter->vsi_res->num_queue_pairs);

	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;
	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,
					  struct i40evf_adapter,
					  watchdog_task);
	struct i40e_hw *hw = &adapter->hw;

	if (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section))
		goto restart_watchdog;

	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
		dev_info(&adapter->pdev->dev, "Checking for redemption\n");
		if ((rd32(hw, I40E_VFGEN_RSTAT) & 0x3) == I40E_VFR_VFACTIVE) {
			/* 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;
		goto watchdog_done;
	}

	if ((adapter->state < __I40EVF_DOWN) ||
	    (adapter->flags & I40EVF_FLAG_RESET_PENDING))
		goto watchdog_done;

	/* check for reset */
	if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING) &&
	    (rd32(hw, I40E_VFGEN_RSTAT) & 0x3) != I40E_VFR_VFACTIVE) {
		adapter->state = __I40EVF_RESETTING;
		adapter->flags |= I40EVF_FLAG_RESET_PENDING;
		dev_err(&adapter->pdev->dev, "Hardware reset detected.\n");
		dev_info(&adapter->pdev->dev, "Scheduling reset task\n");
		schedule_work(&adapter->reset_task);
		adapter->aq_pending = 0;
		adapter->aq_required = 0;
		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
		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);

watchdog_done:
	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
restart_watchdog:
	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);
}

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

	/* Set of random keys generated using kernel random number generator */
	static const u32 seed[I40E_VFQF_HKEY_MAX_INDEX + 1] = {
			0x794221b4, 0xbca0c5ab, 0x6cd5ebd9, 0x1ada6127,
			0x983b3aa1, 0x1c4e71eb, 0x7f6328b2, 0xfcdc0da0,
			0xc135cafa, 0x7a6f7e2d, 0xe7102d28, 0x163cd12e,
			0x4954b126 };

	/* Hash type is configured by the PF - we just supply the key */

	/* Fill out hash function seed */
	for (i = 0; i <= I40E_VFQF_HKEY_MAX_INDEX; i++)
		wr32(hw, I40E_VFQF_HKEY(i), seed[i]);

	/* 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 */
	for (i = 0, j = 0; i < I40E_VFQF_HLUT_MAX_INDEX; i++, j++) {
		if (j == adapter->vsi_res->num_queue_pairs)
			j = 0;
		/* lut = 4-byte sliding window of 4 lut entries */
		lut = (lut << 8) | (j &
			 ((0x1 << 8) - 1));
		/* On i = 3, we have 4 entries in lut; write to the register */
		if ((i & 3) == 3)
			wr32(hw, I40E_VFQF_HLUT(i >> 2), lut);
	}
	i40e_flush(hw);
}

#define I40EVF_RESET_WAIT_MS 100
#define I40EVF_RESET_WAIT_COUNT 200
/**
 * 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)
{
	struct i40evf_adapter *adapter = container_of(work,
						      struct i40evf_adapter,
						      reset_task);
	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))
		udelay(500);
	/* 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;
		if (rstat_val != I40E_VFR_VFACTIVE) {
			dev_info(&adapter->pdev->dev, "Reset now occurring\n");
			break;
		} else {
			msleep(I40EVF_RESET_WAIT_MS);
		}
	}
	if (i == I40EVF_RESET_WAIT_COUNT) {
		dev_err(&adapter->pdev->dev, "Reset was not detected\n");
		adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
		goto continue_reset; /* act like the reset happened */
	}

	/* wait until the reset is complete and the PF is responding to us */
	for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) {
		rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &
			    I40E_VFGEN_RSTAT_VFR_STATE_MASK;
		if (rstat_val == I40E_VFR_VFACTIVE) {
			dev_info(&adapter->pdev->dev, "Reset is complete. Reinitializing.\n");
			break;
		} else {
			msleep(I40EVF_RESET_WAIT_MS);
		}
	}
	if (i == I40EVF_RESET_WAIT_COUNT) {
		/* reset never finished */
		dev_err(&adapter->pdev->dev, "Reset never finished (%x). PF driver is dead, and so am I.\n",
			rstat_val);
		adapter->flags |= I40EVF_FLAG_PF_COMMS_FAILED;

		if (netif_running(adapter->netdev))
			i40evf_close(adapter->netdev);

		i40evf_free_misc_irq(adapter);
		i40evf_reset_interrupt_capability(adapter);
		i40evf_free_queues(adapter);
		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. */
	}

continue_reset:
	adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;

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

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

	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:
	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit.\n");
	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;
	u16 pending;

	if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED)
		return;

	event.msg_size = I40EVF_MAX_AQ_BUF_SIZE;
	event.msg_buf = kzalloc(event.msg_size, GFP_KERNEL);
	if (!event.msg_buf) {
		dev_info(&adapter->pdev->dev, "%s: no memory for ARQ clean\n",
				 __func__);
		return;
	}
	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,
					   event.msg_size);
		if (pending != 0) {
			dev_info(&adapter->pdev->dev,
				 "%s: ARQ: Pending events %d\n",
				 __func__, pending);
			memset(event.msg_buf, 0, I40EVF_MAX_AQ_BUF_SIZE);
		}
	} while (pending);

	/* 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;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++)
		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;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
		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;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
		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;

	for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++)
		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;

	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;
	}
	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);

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

	/* signal that we are down to the interrupt handler */
	adapter->state = __I40EVF_DOWN;

	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);

	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());

	adapter->state = __I40EVF_RESETTING;

	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:
	dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit.\n");
	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++) {
		rstat = rd32(hw, I40E_VFGEN_RSTAT);
		if (rstat == I40E_VFR_VFACTIVE)
			return 0;
		udelay(10);
	}
	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 */
		adapter->flags &= ~I40EVF_FLAG_PF_COMMS_FAILED;
		adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
		err = i40e_set_mac_type(hw);
		if (err) {
			dev_info(&pdev->dev, "%s: set_mac_type failed: %d\n",
				__func__, err);
		goto err;
		}
		err = i40evf_check_reset_complete(hw);
		if (err) {
			dev_info(&pdev->dev, "%s: device is still in reset (%d).\n",
				__func__, err);
			goto err;
		}
		hw->aq.num_arq_entries = I40EVF_AQ_LEN;
		hw->aq.num_asq_entries = I40EVF_AQ_LEN;
		hw->aq.arq_buf_size = I40EVF_MAX_AQ_BUF_SIZE;
		hw->aq.asq_buf_size = I40EVF_MAX_AQ_BUF_SIZE;

		err = i40evf_init_adminq(hw);
		if (err) {
			dev_info(&pdev->dev, "%s: init_adminq failed: %d\n",
				__func__, err);
			goto err;
		}
		err = i40evf_send_api_ver(adapter);
		if (err) {
			dev_info(&pdev->dev, "%s: unable to send to PF (%d)\n",
				__func__, err);
			i40evf_shutdown_adminq(hw);
			goto err;
		}
		adapter->state = __I40EVF_INIT_VERSION_CHECK;
		goto restart;
		break;
	case __I40EVF_INIT_VERSION_CHECK:
		if (!i40evf_asq_done(hw))
			goto err;

		/* aq msg sent, awaiting reply */
		err = i40evf_verify_api_ver(adapter);
		if (err) {
			dev_err(&pdev->dev, "Unable to verify API version, error %d\n",
				err);
			goto err;
		}
		err = i40evf_send_vf_config_msg(adapter);
		if (err) {
			dev_err(&pdev->dev, "Unable send config request, error %d\n",
				err);
			goto err;
		}
		adapter->state = __I40EVF_INIT_GET_RESOURCES;
		goto restart;
		break;
	case __I40EVF_INIT_GET_RESOURCES:
		/* aq msg sent, awaiting reply */
		if (!adapter->vf_res) {
			bufsz = sizeof(struct i40e_virtchnl_vf_resource) +
				(I40E_MAX_VF_VSI *
				 sizeof(struct i40e_virtchnl_vsi_resource));
			adapter->vf_res = kzalloc(bufsz, GFP_KERNEL);
			if (!adapter->vf_res) {
				dev_err(&pdev->dev, "%s: unable to allocate memory\n",
					__func__);
				goto err;
			}
		}
		err = i40evf_get_vf_config(adapter);
		if (err == I40E_ERR_ADMIN_QUEUE_NO_WORK)
			goto restart;
		if (err) {
			dev_info(&pdev->dev, "%s: unable to get VF config (%d)\n",
				__func__, err);
			goto err_alloc;
		}
		adapter->state = __I40EVF_INIT_SW;
		break;
	default:
		goto err_alloc;
	}
	/* got VF config message back from PF, now we can parse it */
	for (i = 0; i < adapter->vf_res->num_vsis; i++) {
		if (adapter->vf_res->vsi_res[i].vsi_type == I40E_VSI_SRIOV)
			adapter->vsi_res = &adapter->vf_res->vsi_res[i];
	}
	if (!adapter->vsi_res) {
		dev_info(&pdev->dev, "%s: no LAN VSI found\n", __func__);
		goto err_alloc;
	}

	adapter->flags |= I40EVF_FLAG_RX_CSUM_ENABLED;

	adapter->txd_count = I40EVF_DEFAULT_TXD;
	adapter->rxd_count = I40EVF_DEFAULT_RXD;

	netdev->netdev_ops = &i40evf_netdev_ops;
	i40evf_set_ethtool_ops(netdev);
	netdev->watchdog_timeo = 5 * HZ;

	netdev->features |= NETIF_F_SG |
			    NETIF_F_IP_CSUM |
			    NETIF_F_SCTP_CSUM |
			    NETIF_F_IPV6_CSUM |
			    NETIF_F_TSO |
			    NETIF_F_TSO6 |
			    NETIF_F_GRO;

	if (adapter->vf_res->vf_offload_flags
	    & I40E_VIRTCHNL_VF_OFFLOAD_VLAN) {
		netdev->vlan_features = netdev->features;
		netdev->features |= NETIF_F_HW_VLAN_CTAG_TX |
				    NETIF_F_HW_VLAN_CTAG_RX |
				    NETIF_F_HW_VLAN_CTAG_FILTER;
	}

	/* The HW MAC address was set and/or determined in sw_init */
	if (!is_valid_ether_addr(adapter->hw.mac.addr)) {
		dev_info(&pdev->dev,
			"Invalid MAC address %pMAC, using random\n",
			adapter->hw.mac.addr);
		random_ether_addr(adapter->hw.mac.addr);
	}
	memcpy(netdev->dev_addr, adapter->hw.mac.addr, netdev->addr_len);
	memcpy(netdev->perm_addr, adapter->hw.mac.addr, netdev->addr_len);

	INIT_LIST_HEAD(&adapter->mac_filter_list);
	INIT_LIST_HEAD(&adapter->vlan_filter_list);
	f = kzalloc(sizeof(*f), GFP_ATOMIC);
	if (NULL == f)
		goto err_sw_init;

	memcpy(f->macaddr, adapter->hw.mac.addr, ETH_ALEN);
	f->add = true;
	adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;

	list_add(&f->list, &adapter->mac_filter_list);

	init_timer(&adapter->watchdog_timer);
	adapter->watchdog_timer.function = &i40evf_watchdog_timer;
	adapter->watchdog_timer.data = (unsigned long)adapter;
	mod_timer(&adapter->watchdog_timer, jiffies + 1);

	err = i40evf_init_interrupt_scheme(adapter);
	if (err)
		goto err_sw_init;
	i40evf_map_rings_to_vectors(adapter);
	i40evf_configure_rss(adapter);
	err = i40evf_request_misc_irq(adapter);
	if (err)
		goto err_sw_init;

	netif_carrier_off(netdev);

	strcpy(netdev->name, "eth%d");

	adapter->vsi.id = adapter->vsi_res->vsi_id;
	adapter->vsi.seid = adapter->vsi_res->vsi_id; /* dummy */
	adapter->vsi.back = adapter;
	adapter->vsi.base_vector = 1;
	adapter->vsi.work_limit = I40E_DEFAULT_IRQ_WORK;
	adapter->vsi.rx_itr_setting = I40E_ITR_DYNAMIC;
	adapter->vsi.tx_itr_setting = I40E_ITR_DYNAMIC;
	adapter->vsi.netdev = adapter->netdev;

	if (!adapter->netdev_registered) {
		err = register_netdev(netdev);
		if (err)
			goto err_register;
	}

	adapter->netdev_registered = true;

	netif_tx_stop_all_queues(netdev);

	dev_info(&pdev->dev, "MAC address: %pMAC\n", adapter->hw.mac.addr);
	if (netdev->features & NETIF_F_GRO)
		dev_info(&pdev->dev, "GRO is enabled\n");

	dev_info(&pdev->dev, "%s\n", i40evf_driver_string);
	adapter->state = __I40EVF_DOWN;
	set_bit(__I40E_DOWN, &adapter->vsi.state);
	i40evf_misc_irq_enable(adapter);
	return;
restart:
	schedule_delayed_work(&adapter->init_task,
			      msecs_to_jiffies(50));
	return;

err_register:
	i40evf_free_misc_irq(adapter);
err_sw_init:
	i40evf_reset_interrupt_capability(adapter);
err_alloc:
	kfree(adapter->vf_res);
	adapter->vf_res = NULL;
err:
	if (hw->aq.asq.count)
		i40evf_shutdown_adminq(hw); /* ignore error */
	/* Things went into the weeds, so try again later */
	if (++adapter->aq_wait_count > I40EVF_AQ_MAX_ERR) {
		dev_err(&pdev->dev, "Failed to communicate with PF; giving up.\n");
		adapter->flags |= I40EVF_FLAG_PF_COMMS_FAILED;
		return; /* do not reschedule */
	}
	schedule_delayed_work(&adapter->init_task, HZ * 3);
	return;
}

/**
 * i40evf_shutdown - Shutdown the device in preparation for a reboot
 * @pdev: pci device structure
 **/
static void i40evf_shutdown(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);

	netif_device_detach(netdev);

	if (netif_running(netdev))
		i40evf_close(netdev);

#ifdef CONFIG_PM
	pci_save_state(pdev);

#endif
	pci_disable_device(pdev);
}

/**
 * i40evf_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in i40evf_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * i40evf_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/
static int i40evf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct net_device *netdev;
	struct i40evf_adapter *adapter = NULL;
	struct i40e_hw *hw = NULL;
	int err, pci_using_dac;

	err = pci_enable_device(pdev);
	if (err)
		return err;

	if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
		pci_using_dac = true;
		/* coherent mask for the same size will always succeed if
		 * dma_set_mask does
		 */
		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
	} else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
		pci_using_dac = false;
		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
	} else {
		dev_err(&pdev->dev, "%s: DMA configuration failed: %d\n",
			 __func__, err);
		err = -EIO;
		goto err_dma;
	}

	err = pci_request_regions(pdev, i40evf_driver_name);
	if (err) {
		dev_err(&pdev->dev,
			"pci_request_regions failed 0x%x\n", err);
		goto err_pci_reg;
	}

	pci_enable_pcie_error_reporting(pdev);

	pci_set_master(pdev);

	netdev = alloc_etherdev_mq(sizeof(struct i40evf_adapter),
				   MAX_TX_QUEUES);
	if (!netdev) {
		err = -ENOMEM;
		goto err_alloc_etherdev;
	}

	SET_NETDEV_DEV(netdev, &pdev->dev);

	pci_set_drvdata(pdev, netdev);
	adapter = netdev_priv(netdev);
	if (pci_using_dac)
		netdev->features |= NETIF_F_HIGHDMA;

	adapter->netdev = netdev;
	adapter->pdev = pdev;

	hw = &adapter->hw;
	hw->back = adapter;

	adapter->msg_enable = (1 << DEFAULT_DEBUG_LEVEL_SHIFT) - 1;
	adapter->state = __I40EVF_STARTUP;

	/* Call save state here because it relies on the adapter struct. */
	pci_save_state(pdev);

	hw->hw_addr = ioremap(pci_resource_start(pdev, 0),
			      pci_resource_len(pdev, 0));
	if (!hw->hw_addr) {
		err = -EIO;
		goto err_ioremap;
	}
	hw->vendor_id = pdev->vendor;
	hw->device_id = pdev->device;
	pci_read_config_byte(pdev, PCI_REVISION_ID, &hw->revision_id);
	hw->subsystem_vendor_id = pdev->subsystem_vendor;
	hw->subsystem_device_id = pdev->subsystem_device;
	hw->bus.device = PCI_SLOT(pdev->devfn);
	hw->bus.func = PCI_FUNC(pdev->devfn);

	INIT_WORK(&adapter->reset_task, i40evf_reset_task);
	INIT_WORK(&adapter->adminq_task, i40evf_adminq_task);
	INIT_WORK(&adapter->watchdog_task, i40evf_watchdog_task);
	INIT_DELAYED_WORK(&adapter->init_task, i40evf_init_task);
	schedule_delayed_work(&adapter->init_task, 10);

	return 0;

err_ioremap:
	free_netdev(netdev);
err_alloc_etherdev:
	pci_release_regions(pdev);
err_pci_reg:
err_dma:
	pci_disable_device(pdev);
	return err;
}

#ifdef CONFIG_PM
/**
 * i40evf_suspend - Power management suspend routine
 * @pdev: PCI device information struct
 * @state: unused
 *
 * Called when the system (VM) is entering sleep/suspend.
 **/
static int i40evf_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	int retval = 0;

	netif_device_detach(netdev);

	if (netif_running(netdev)) {
		rtnl_lock();
		i40evf_down(adapter);
		rtnl_unlock();
	}
	i40evf_free_misc_irq(adapter);
	i40evf_reset_interrupt_capability(adapter);

	retval = pci_save_state(pdev);
	if (retval)
		return retval;

	pci_disable_device(pdev);

	return 0;
}

/**
 * i40evf_resume - Power managment resume routine
 * @pdev: PCI device information struct
 *
 * Called when the system (VM) is resumed from sleep/suspend.
 **/
static int i40evf_resume(struct pci_dev *pdev)
{
	struct i40evf_adapter *adapter = pci_get_drvdata(pdev);
	struct net_device *netdev = adapter->netdev;
	u32 err;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	/* pci_restore_state clears dev->state_saved so call
	 * pci_save_state to restore it.
	 */
	pci_save_state(pdev);

	err = pci_enable_device_mem(pdev);
	if (err) {
		dev_err(&pdev->dev, "Cannot enable PCI device from suspend.\n");
		return err;
	}
	pci_set_master(pdev);

	rtnl_lock();
	err = i40evf_set_interrupt_capability(adapter);
	if (err) {
		dev_err(&pdev->dev, "Cannot enable MSI-X interrupts.\n");
		return err;
	}
	err = i40evf_request_misc_irq(adapter);
	rtnl_unlock();
	if (err) {
		dev_err(&pdev->dev, "Cannot get interrupt vector.\n");
		return err;
	}

	schedule_work(&adapter->reset_task);

	netif_device_attach(netdev);

	return err;
}

#endif /* CONFIG_PM */
/**
 * i40evf_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * i40evf_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void i40evf_remove(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct i40evf_adapter *adapter = netdev_priv(netdev);
	struct i40e_hw *hw = &adapter->hw;

	cancel_delayed_work_sync(&adapter->init_task);
	cancel_work_sync(&adapter->reset_task);

	if (adapter->netdev_registered) {
		unregister_netdev(netdev);
		adapter->netdev_registered = false;
	}
	adapter->state = __I40EVF_REMOVE;

	if (adapter->num_msix_vectors) {
		i40evf_misc_irq_disable(adapter);
		del_timer_sync(&adapter->watchdog_timer);

		flush_scheduled_work();

		i40evf_free_misc_irq(adapter);

		i40evf_reset_interrupt_capability(adapter);
	}

	if (hw->aq.asq.count)
		i40evf_shutdown_adminq(hw);

	iounmap(hw->hw_addr);
	pci_release_regions(pdev);

	i40evf_free_queues(adapter);
	kfree(adapter->vf_res);

	free_netdev(netdev);

	pci_disable_pcie_error_reporting(pdev);

	pci_disable_device(pdev);
}

static struct pci_driver i40evf_driver = {
	.name     = i40evf_driver_name,
	.id_table = i40evf_pci_tbl,
	.probe    = i40evf_probe,
	.remove   = i40evf_remove,
#ifdef CONFIG_PM
	.suspend  = i40evf_suspend,
	.resume   = i40evf_resume,
#endif
	.shutdown = i40evf_shutdown,
};

/**
 * i40e_init_module - Driver Registration Routine
 *
 * i40e_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init i40evf_init_module(void)
{
	int ret;
	pr_info("i40evf: %s - version %s\n", i40evf_driver_string,
	       i40evf_driver_version);

	pr_info("%s\n", i40evf_copyright);

	ret = pci_register_driver(&i40evf_driver);
	return ret;
}

module_init(i40evf_init_module);

/**
 * i40e_exit_module - Driver Exit Cleanup Routine
 *
 * i40e_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit i40evf_exit_module(void)
{
	pci_unregister_driver(&i40evf_driver);
}

module_exit(i40evf_exit_module);

/* i40evf_main.c */