gpio: rcar: Fix runtime PM imbalance on error

[linux/fpc-iii.git] / drivers / net / ethernet / intel / fm10k / fm10k_netdev.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2019 Intel Corporation. */

#include "fm10k.h"
#include <linux/vmalloc.h>
#include <net/udp_tunnel.h>
#include <linux/if_macvlan.h>

/**
 * fm10k_setup_tx_resources - allocate Tx resources (Descriptors)
 * @tx_ring:    tx descriptor ring (for a specific queue) to setup
 *
 * Return 0 on success, negative on failure
 **/
int fm10k_setup_tx_resources(struct fm10k_ring *tx_ring)
{
        struct device *dev = tx_ring->dev;
        int size;

        size = sizeof(struct fm10k_tx_buffer) * tx_ring->count;

        tx_ring->tx_buffer = vzalloc(size);
        if (!tx_ring->tx_buffer)
                goto err;

        u64_stats_init(&tx_ring->syncp);

        /* round up to nearest 4K */
        tx_ring->size = tx_ring->count * sizeof(struct fm10k_tx_desc);
        tx_ring->size = ALIGN(tx_ring->size, 4096);

        tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
                                           &tx_ring->dma, GFP_KERNEL);
        if (!tx_ring->desc)
                goto err;

        return 0;

err:
        vfree(tx_ring->tx_buffer);
        tx_ring->tx_buffer = NULL;
        return -ENOMEM;
}

/**
 * fm10k_setup_all_tx_resources - allocate all queues Tx resources
 * @interface: 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 fm10k_setup_all_tx_resources(struct fm10k_intfc *interface)
{
        int i, err;

        for (i = 0; i < interface->num_tx_queues; i++) {
                err = fm10k_setup_tx_resources(interface->tx_ring[i]);
                if (!err)
                        continue;

                netif_err(interface, probe, interface->netdev,
                          "Allocation for Tx Queue %u failed\n", i);
                goto err_setup_tx;
        }

        return 0;
err_setup_tx:
        /* rewind the index freeing the rings as we go */
        while (i--)
                fm10k_free_tx_resources(interface->tx_ring[i]);
        return err;
}

/**
 * fm10k_setup_rx_resources - allocate Rx resources (Descriptors)
 * @rx_ring:    rx descriptor ring (for a specific queue) to setup
 *
 * Returns 0 on success, negative on failure
 **/
int fm10k_setup_rx_resources(struct fm10k_ring *rx_ring)
{
        struct device *dev = rx_ring->dev;
        int size;

        size = sizeof(struct fm10k_rx_buffer) * rx_ring->count;

        rx_ring->rx_buffer = vzalloc(size);
        if (!rx_ring->rx_buffer)
                goto err;

        u64_stats_init(&rx_ring->syncp);

        /* Round up to nearest 4K */
        rx_ring->size = rx_ring->count * sizeof(union fm10k_rx_desc);
        rx_ring->size = ALIGN(rx_ring->size, 4096);

        rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size,
                                           &rx_ring->dma, GFP_KERNEL);
        if (!rx_ring->desc)
                goto err;

        return 0;
err:
        vfree(rx_ring->rx_buffer);
        rx_ring->rx_buffer = NULL;
        return -ENOMEM;
}

/**
 * fm10k_setup_all_rx_resources - allocate all queues Rx resources
 * @interface: 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 fm10k_setup_all_rx_resources(struct fm10k_intfc *interface)
{
        int i, err;

        for (i = 0; i < interface->num_rx_queues; i++) {
                err = fm10k_setup_rx_resources(interface->rx_ring[i]);
                if (!err)
                        continue;

                netif_err(interface, probe, interface->netdev,
                          "Allocation for Rx Queue %u failed\n", i);
                goto err_setup_rx;
        }

        return 0;
err_setup_rx:
        /* rewind the index freeing the rings as we go */
        while (i--)
                fm10k_free_rx_resources(interface->rx_ring[i]);
        return err;
}

void fm10k_unmap_and_free_tx_resource(struct fm10k_ring *ring,
                                      struct fm10k_tx_buffer *tx_buffer)
{
        if (tx_buffer->skb) {
                dev_kfree_skb_any(tx_buffer->skb);
                if (dma_unmap_len(tx_buffer, len))
                        dma_unmap_single(ring->dev,
                                         dma_unmap_addr(tx_buffer, dma),
                                         dma_unmap_len(tx_buffer, len),
                                         DMA_TO_DEVICE);
        } else if (dma_unmap_len(tx_buffer, len)) {
                dma_unmap_page(ring->dev,
                               dma_unmap_addr(tx_buffer, dma),
                               dma_unmap_len(tx_buffer, len),
                               DMA_TO_DEVICE);
        }
        tx_buffer->next_to_watch = NULL;
        tx_buffer->skb = NULL;
        dma_unmap_len_set(tx_buffer, len, 0);
        /* tx_buffer must be completely set up in the transmit path */
}

/**
 * fm10k_clean_tx_ring - Free Tx Buffers
 * @tx_ring: ring to be cleaned
 **/
static void fm10k_clean_tx_ring(struct fm10k_ring *tx_ring)
{
        unsigned long size;
        u16 i;

        /* ring already cleared, nothing to do */
        if (!tx_ring->tx_buffer)
                return;

        /* Free all the Tx ring sk_buffs */
        for (i = 0; i < tx_ring->count; i++) {
                struct fm10k_tx_buffer *tx_buffer = &tx_ring->tx_buffer[i];

                fm10k_unmap_and_free_tx_resource(tx_ring, tx_buffer);
        }

        /* reset BQL values */
        netdev_tx_reset_queue(txring_txq(tx_ring));

        size = sizeof(struct fm10k_tx_buffer) * tx_ring->count;
        memset(tx_ring->tx_buffer, 0, size);

        /* Zero out the descriptor ring */
        memset(tx_ring->desc, 0, tx_ring->size);
}

/**
 * fm10k_free_tx_resources - Free Tx Resources per Queue
 * @tx_ring: Tx descriptor ring for a specific queue
 *
 * Free all transmit software resources
 **/
void fm10k_free_tx_resources(struct fm10k_ring *tx_ring)
{
        fm10k_clean_tx_ring(tx_ring);

        vfree(tx_ring->tx_buffer);
        tx_ring->tx_buffer = NULL;

        /* if not set, then don't free */
        if (!tx_ring->desc)
                return;

        dma_free_coherent(tx_ring->dev, tx_ring->size,
                          tx_ring->desc, tx_ring->dma);
        tx_ring->desc = NULL;
}

/**
 * fm10k_clean_all_tx_rings - Free Tx Buffers for all queues
 * @interface: board private structure
 **/
void fm10k_clean_all_tx_rings(struct fm10k_intfc *interface)
{
        int i;

        for (i = 0; i < interface->num_tx_queues; i++)
                fm10k_clean_tx_ring(interface->tx_ring[i]);
}

/**
 * fm10k_free_all_tx_resources - Free Tx Resources for All Queues
 * @interface: board private structure
 *
 * Free all transmit software resources
 **/
static void fm10k_free_all_tx_resources(struct fm10k_intfc *interface)
{
        int i = interface->num_tx_queues;

        while (i--)
                fm10k_free_tx_resources(interface->tx_ring[i]);
}

/**
 * fm10k_clean_rx_ring - Free Rx Buffers per Queue
 * @rx_ring: ring to free buffers from
 **/
static void fm10k_clean_rx_ring(struct fm10k_ring *rx_ring)
{
        unsigned long size;
        u16 i;

        if (!rx_ring->rx_buffer)
                return;

        dev_kfree_skb(rx_ring->skb);
        rx_ring->skb = NULL;

        /* Free all the Rx ring sk_buffs */
        for (i = 0; i < rx_ring->count; i++) {
                struct fm10k_rx_buffer *buffer = &rx_ring->rx_buffer[i];
                /* clean-up will only set page pointer to NULL */
                if (!buffer->page)
                        continue;

                dma_unmap_page(rx_ring->dev, buffer->dma,
                               PAGE_SIZE, DMA_FROM_DEVICE);
                __free_page(buffer->page);

                buffer->page = NULL;
        }

        size = sizeof(struct fm10k_rx_buffer) * rx_ring->count;
        memset(rx_ring->rx_buffer, 0, size);

        /* Zero out the descriptor ring */
        memset(rx_ring->desc, 0, rx_ring->size);

        rx_ring->next_to_alloc = 0;
        rx_ring->next_to_clean = 0;
        rx_ring->next_to_use = 0;
}

/**
 * fm10k_free_rx_resources - Free Rx Resources
 * @rx_ring: ring to clean the resources from
 *
 * Free all receive software resources
 **/
void fm10k_free_rx_resources(struct fm10k_ring *rx_ring)
{
        fm10k_clean_rx_ring(rx_ring);

        vfree(rx_ring->rx_buffer);
        rx_ring->rx_buffer = NULL;

        /* if not set, then don't free */
        if (!rx_ring->desc)
                return;

        dma_free_coherent(rx_ring->dev, rx_ring->size,
                          rx_ring->desc, rx_ring->dma);

        rx_ring->desc = NULL;
}

/**
 * fm10k_clean_all_rx_rings - Free Rx Buffers for all queues
 * @interface: board private structure
 **/
void fm10k_clean_all_rx_rings(struct fm10k_intfc *interface)
{
        int i;

        for (i = 0; i < interface->num_rx_queues; i++)
                fm10k_clean_rx_ring(interface->rx_ring[i]);
}

/**
 * fm10k_free_all_rx_resources - Free Rx Resources for All Queues
 * @interface: board private structure
 *
 * Free all receive software resources
 **/
static void fm10k_free_all_rx_resources(struct fm10k_intfc *interface)
{
        int i = interface->num_rx_queues;

        while (i--)
                fm10k_free_rx_resources(interface->rx_ring[i]);
}

/**
 * fm10k_request_glort_range - Request GLORTs for use in configuring rules
 * @interface: board private structure
 *
 * This function allocates a range of glorts for this interface to use.
 **/
static void fm10k_request_glort_range(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        u16 mask = (~hw->mac.dglort_map) >> FM10K_DGLORTMAP_MASK_SHIFT;

        /* establish GLORT base */
        interface->glort = hw->mac.dglort_map & FM10K_DGLORTMAP_NONE;
        interface->glort_count = 0;

        /* nothing we can do until mask is allocated */
        if (hw->mac.dglort_map == FM10K_DGLORTMAP_NONE)
                return;

        /* we support 3 possible GLORT configurations.
         * 1: VFs consume all but the last 1
         * 2: VFs and PF split glorts with possible gap between
         * 3: VFs allocated first 64, all others belong to PF
         */
        if (mask <= hw->iov.total_vfs) {
                interface->glort_count = 1;
                interface->glort += mask;
        } else if (mask < 64) {
                interface->glort_count = (mask + 1) / 2;
                interface->glort += interface->glort_count;
        } else {
                interface->glort_count = mask - 63;
                interface->glort += 64;
        }
}

/**
 * fm10k_free_udp_port_info
 * @interface: board private structure
 *
 * This function frees both geneve_port and vxlan_port structures
 **/
static void fm10k_free_udp_port_info(struct fm10k_intfc *interface)
{
        struct fm10k_udp_port *port;

        /* flush all entries from vxlan list */
        port = list_first_entry_or_null(&interface->vxlan_port,
                                        struct fm10k_udp_port, list);
        while (port) {
                list_del(&port->list);
                kfree(port);
                port = list_first_entry_or_null(&interface->vxlan_port,
                                                struct fm10k_udp_port,
                                                list);
        }

        /* flush all entries from geneve list */
        port = list_first_entry_or_null(&interface->geneve_port,
                                        struct fm10k_udp_port, list);
        while (port) {
                list_del(&port->list);
                kfree(port);
                port = list_first_entry_or_null(&interface->vxlan_port,
                                                struct fm10k_udp_port,
                                                list);
        }
}

/**
 * fm10k_restore_udp_port_info
 * @interface: board private structure
 *
 * This function restores the value in the tunnel_cfg register(s) after reset
 **/
static void fm10k_restore_udp_port_info(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        struct fm10k_udp_port *port;

        /* only the PF supports configuring tunnels */
        if (hw->mac.type != fm10k_mac_pf)
                return;

        port = list_first_entry_or_null(&interface->vxlan_port,
                                        struct fm10k_udp_port, list);

        /* restore tunnel configuration register */
        fm10k_write_reg(hw, FM10K_TUNNEL_CFG,
                        (port ? ntohs(port->port) : 0) |
                        (ETH_P_TEB << FM10K_TUNNEL_CFG_NVGRE_SHIFT));

        port = list_first_entry_or_null(&interface->geneve_port,
                                        struct fm10k_udp_port, list);

        /* restore Geneve tunnel configuration register */
        fm10k_write_reg(hw, FM10K_TUNNEL_CFG_GENEVE,
                        (port ? ntohs(port->port) : 0));
}

static struct fm10k_udp_port *
fm10k_remove_tunnel_port(struct list_head *ports,
                         struct udp_tunnel_info *ti)
{
        struct fm10k_udp_port *port;

        list_for_each_entry(port, ports, list) {
                if ((port->port == ti->port) &&
                    (port->sa_family == ti->sa_family)) {
                        list_del(&port->list);
                        return port;
                }
        }

        return NULL;
}

static void fm10k_insert_tunnel_port(struct list_head *ports,
                                     struct udp_tunnel_info *ti)
{
        struct fm10k_udp_port *port;

        /* remove existing port entry from the list so that the newest items
         * are always at the tail of the list.
         */
        port = fm10k_remove_tunnel_port(ports, ti);
        if (!port) {
                port = kmalloc(sizeof(*port), GFP_ATOMIC);
                if  (!port)
                        return;
                port->port = ti->port;
                port->sa_family = ti->sa_family;
        }

        list_add_tail(&port->list, ports);
}

/**
 * fm10k_udp_tunnel_add
 * @dev: network interface device structure
 * @ti: Tunnel endpoint information
 *
 * This function is called when a new UDP tunnel port has been added.
 * Due to hardware restrictions, only one port per type can be offloaded at
 * once.
 **/
static void fm10k_udp_tunnel_add(struct net_device *dev,
                                 struct udp_tunnel_info *ti)
{
        struct fm10k_intfc *interface = netdev_priv(dev);

        /* only the PF supports configuring tunnels */
        if (interface->hw.mac.type != fm10k_mac_pf)
                return;

        switch (ti->type) {
        case UDP_TUNNEL_TYPE_VXLAN:
                fm10k_insert_tunnel_port(&interface->vxlan_port, ti);
                break;
        case UDP_TUNNEL_TYPE_GENEVE:
                fm10k_insert_tunnel_port(&interface->geneve_port, ti);
                break;
        default:
                return;
        }

        fm10k_restore_udp_port_info(interface);
}

/**
 * fm10k_udp_tunnel_del
 * @dev: network interface device structure
 * @ti: Tunnel end point information
 *
 * This function is called when a new UDP tunnel port is deleted. The freed
 * port will be removed from the list, then we reprogram the offloaded port
 * based on the head of the list.
 **/
static void fm10k_udp_tunnel_del(struct net_device *dev,
                                 struct udp_tunnel_info *ti)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        struct fm10k_udp_port *port = NULL;

        if (interface->hw.mac.type != fm10k_mac_pf)
                return;

        switch (ti->type) {
        case UDP_TUNNEL_TYPE_VXLAN:
                port = fm10k_remove_tunnel_port(&interface->vxlan_port, ti);
                break;
        case UDP_TUNNEL_TYPE_GENEVE:
                port = fm10k_remove_tunnel_port(&interface->geneve_port, ti);
                break;
        default:
                return;
        }

        /* if we did remove a port we need to free its memory */
        kfree(port);

        fm10k_restore_udp_port_info(interface);
}

/**
 * fm10k_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.
 **/
int fm10k_open(struct net_device *netdev)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);
        int err;

        /* allocate transmit descriptors */
        err = fm10k_setup_all_tx_resources(interface);
        if (err)
                goto err_setup_tx;

        /* allocate receive descriptors */
        err = fm10k_setup_all_rx_resources(interface);
        if (err)
                goto err_setup_rx;

        /* allocate interrupt resources */
        err = fm10k_qv_request_irq(interface);
        if (err)
                goto err_req_irq;

        /* setup GLORT assignment for this port */
        fm10k_request_glort_range(interface);

        /* Notify the stack of the actual queue counts */
        err = netif_set_real_num_tx_queues(netdev,
                                           interface->num_tx_queues);
        if (err)
                goto err_set_queues;

        err = netif_set_real_num_rx_queues(netdev,
                                           interface->num_rx_queues);
        if (err)
                goto err_set_queues;

        udp_tunnel_get_rx_info(netdev);

        fm10k_up(interface);

        return 0;

err_set_queues:
        fm10k_qv_free_irq(interface);
err_req_irq:
        fm10k_free_all_rx_resources(interface);
err_setup_rx:
        fm10k_free_all_tx_resources(interface);
err_setup_tx:
        return err;
}

/**
 * fm10k_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.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 **/
int fm10k_close(struct net_device *netdev)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);

        fm10k_down(interface);

        fm10k_qv_free_irq(interface);

        fm10k_free_udp_port_info(interface);

        fm10k_free_all_tx_resources(interface);
        fm10k_free_all_rx_resources(interface);

        return 0;
}

static netdev_tx_t fm10k_xmit_frame(struct sk_buff *skb, struct net_device *dev)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        int num_tx_queues = READ_ONCE(interface->num_tx_queues);
        unsigned int r_idx = skb->queue_mapping;
        int err;

        if (!num_tx_queues)
                return NETDEV_TX_BUSY;

        if ((skb->protocol == htons(ETH_P_8021Q)) &&
            !skb_vlan_tag_present(skb)) {
                /* FM10K only supports hardware tagging, any tags in frame
                 * are considered 2nd level or "outer" tags
                 */
                struct vlan_hdr *vhdr;
                __be16 proto;

                /* make sure skb is not shared */
                skb = skb_share_check(skb, GFP_ATOMIC);
                if (!skb)
                        return NETDEV_TX_OK;

                /* make sure there is enough room to move the ethernet header */
                if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN)))
                        return NETDEV_TX_OK;

                /* verify the skb head is not shared */
                err = skb_cow_head(skb, 0);
                if (err) {
                        dev_kfree_skb(skb);
                        return NETDEV_TX_OK;
                }

                /* locate VLAN header */
                vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);

                /* pull the 2 key pieces of data out of it */
                __vlan_hwaccel_put_tag(skb,
                                       htons(ETH_P_8021Q),
                                       ntohs(vhdr->h_vlan_TCI));
                proto = vhdr->h_vlan_encapsulated_proto;
                skb->protocol = (ntohs(proto) >= 1536) ? proto :
                                                         htons(ETH_P_802_2);

                /* squash it by moving the ethernet addresses up 4 bytes */
                memmove(skb->data + VLAN_HLEN, skb->data, 12);
                __skb_pull(skb, VLAN_HLEN);
                skb_reset_mac_header(skb);
        }

        /* The minimum packet size for a single buffer is 17B so pad the skb
         * in order to meet this minimum size requirement.
         */
        if (unlikely(skb->len < 17)) {
                int pad_len = 17 - skb->len;

                if (skb_pad(skb, pad_len))
                        return NETDEV_TX_OK;
                __skb_put(skb, pad_len);
        }

        if (r_idx >= num_tx_queues)
                r_idx %= num_tx_queues;

        err = fm10k_xmit_frame_ring(skb, interface->tx_ring[r_idx]);

        return err;
}

/**
 * fm10k_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 * @txqueue: the index of the Tx queue that timed out
 **/
static void fm10k_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);
        struct fm10k_ring *tx_ring;
        bool real_tx_hang = false;

        if (txqueue >= interface->num_tx_queues) {
                WARN(1, "invalid Tx queue index %d", txqueue);
                return;
        }

        tx_ring = interface->tx_ring[txqueue];
        if (check_for_tx_hang(tx_ring) && fm10k_check_tx_hang(tx_ring))
                real_tx_hang = true;

#define TX_TIMEO_LIMIT 16000
        if (real_tx_hang) {
                fm10k_tx_timeout_reset(interface);
        } else {
                netif_info(interface, drv, netdev,
                           "Fake Tx hang detected with timeout of %d seconds\n",
                           netdev->watchdog_timeo / HZ);

                /* fake Tx hang - increase the kernel timeout */
                if (netdev->watchdog_timeo < TX_TIMEO_LIMIT)
                        netdev->watchdog_timeo *= 2;
        }
}

/**
 * fm10k_host_mbx_ready - Check PF interface's mailbox readiness
 * @interface: board private structure
 *
 * This function checks if the PF interface's mailbox is ready before queueing
 * mailbox messages for transmission. This will prevent filling the TX mailbox
 * queue when the receiver is not ready. VF interfaces are exempt from this
 * check since it will block all PF-VF mailbox messages from being sent from
 * the VF to the PF at initialization.
 **/
static bool fm10k_host_mbx_ready(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;

        return (hw->mac.type == fm10k_mac_vf || interface->host_ready);
}

/**
 * fm10k_queue_vlan_request - Queue a VLAN update request
 * @interface: the fm10k interface structure
 * @vid: the VLAN vid
 * @vsi: VSI index number
 * @set: whether to set or clear
 *
 * This function queues up a VLAN update. For VFs, this must be sent to the
 * managing PF over the mailbox. For PFs, we'll use the same handling so that
 * it's similar to the VF. This avoids storming the PF<->VF mailbox with too
 * many VLAN updates during reset.
 */
int fm10k_queue_vlan_request(struct fm10k_intfc *interface,
                             u32 vid, u8 vsi, bool set)
{
        struct fm10k_macvlan_request *request;
        unsigned long flags;

        /* This must be atomic since we may be called while the netdev
         * addr_list_lock is held
         */
        request = kzalloc(sizeof(*request), GFP_ATOMIC);
        if (!request)
                return -ENOMEM;

        request->type = FM10K_VLAN_REQUEST;
        request->vlan.vid = vid;
        request->vlan.vsi = vsi;
        request->set = set;

        spin_lock_irqsave(&interface->macvlan_lock, flags);
        list_add_tail(&request->list, &interface->macvlan_requests);
        spin_unlock_irqrestore(&interface->macvlan_lock, flags);

        fm10k_macvlan_schedule(interface);

        return 0;
}

/**
 * fm10k_queue_mac_request - Queue a MAC update request
 * @interface: the fm10k interface structure
 * @glort: the target glort for this update
 * @addr: the address to update
 * @vid: the vid to update
 * @set: whether to add or remove
 *
 * This function queues up a MAC request for sending to the switch manager.
 * A separate thread monitors the queue and sends updates to the switch
 * manager. Return 0 on success, and negative error code on failure.
 **/
int fm10k_queue_mac_request(struct fm10k_intfc *interface, u16 glort,
                            const unsigned char *addr, u16 vid, bool set)
{
        struct fm10k_macvlan_request *request;
        unsigned long flags;

        /* This must be atomic since we may be called while the netdev
         * addr_list_lock is held
         */
        request = kzalloc(sizeof(*request), GFP_ATOMIC);
        if (!request)
                return -ENOMEM;

        if (is_multicast_ether_addr(addr))
                request->type = FM10K_MC_MAC_REQUEST;
        else
                request->type = FM10K_UC_MAC_REQUEST;

        ether_addr_copy(request->mac.addr, addr);
        request->mac.glort = glort;
        request->mac.vid = vid;
        request->set = set;

        spin_lock_irqsave(&interface->macvlan_lock, flags);
        list_add_tail(&request->list, &interface->macvlan_requests);
        spin_unlock_irqrestore(&interface->macvlan_lock, flags);

        fm10k_macvlan_schedule(interface);

        return 0;
}

/**
 * fm10k_clear_macvlan_queue - Cancel pending updates for a given glort
 * @interface: the fm10k interface structure
 * @glort: the target glort to clear
 * @vlans: true to clear VLAN messages, false to ignore them
 *
 * Cancel any outstanding MAC/VLAN requests for a given glort. This is
 * expected to be called when a logical port goes down.
 **/
void fm10k_clear_macvlan_queue(struct fm10k_intfc *interface,
                               u16 glort, bool vlans)

{
        struct fm10k_macvlan_request *r, *tmp;
        unsigned long flags;

        spin_lock_irqsave(&interface->macvlan_lock, flags);

        /* Free any outstanding MAC/VLAN requests for this interface */
        list_for_each_entry_safe(r, tmp, &interface->macvlan_requests, list) {
                switch (r->type) {
                case FM10K_MC_MAC_REQUEST:
                case FM10K_UC_MAC_REQUEST:
                        /* Don't free requests for other interfaces */
                        if (r->mac.glort != glort)
                                break;
                        /* fall through */
                case FM10K_VLAN_REQUEST:
                        if (vlans) {
                                list_del(&r->list);
                                kfree(r);
                        }
                        break;
                }
        }

        spin_unlock_irqrestore(&interface->macvlan_lock, flags);
}

static int fm10k_uc_vlan_unsync(struct net_device *netdev,
                                const unsigned char *uc_addr)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);
        u16 glort = interface->glort;
        u16 vid = interface->vid;
        bool set = !!(vid / VLAN_N_VID);
        int err;

        /* drop any leading bits on the VLAN ID */
        vid &= VLAN_N_VID - 1;

        err = fm10k_queue_mac_request(interface, glort, uc_addr, vid, set);
        if (err)
                return err;

        /* return non-zero value as we are only doing a partial sync/unsync */
        return 1;
}

static int fm10k_mc_vlan_unsync(struct net_device *netdev,
                                const unsigned char *mc_addr)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);
        u16 glort = interface->glort;
        u16 vid = interface->vid;
        bool set = !!(vid / VLAN_N_VID);
        int err;

        /* drop any leading bits on the VLAN ID */
        vid &= VLAN_N_VID - 1;

        err = fm10k_queue_mac_request(interface, glort, mc_addr, vid, set);
        if (err)
                return err;

        /* return non-zero value as we are only doing a partial sync/unsync */
        return 1;
}

static int fm10k_update_vid(struct net_device *netdev, u16 vid, bool set)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);
        struct fm10k_l2_accel *l2_accel = interface->l2_accel;
        struct fm10k_hw *hw = &interface->hw;
        u16 glort;
        s32 err;
        int i;

        /* updates do not apply to VLAN 0 */
        if (!vid)
                return 0;

        if (vid >= VLAN_N_VID)
                return -EINVAL;

        /* Verify that we have permission to add VLANs. If this is a request
         * to remove a VLAN, we still want to allow the user to remove the
         * VLAN device. In that case, we need to clear the bit in the
         * active_vlans bitmask.
         */
        if (set && hw->mac.vlan_override)
                return -EACCES;

        /* update active_vlans bitmask */
        set_bit(vid, interface->active_vlans);
        if (!set)
                clear_bit(vid, interface->active_vlans);

        /* disable the default VLAN ID on ring if we have an active VLAN */
        for (i = 0; i < interface->num_rx_queues; i++) {
                struct fm10k_ring *rx_ring = interface->rx_ring[i];
                u16 rx_vid = rx_ring->vid & (VLAN_N_VID - 1);

                if (test_bit(rx_vid, interface->active_vlans))
                        rx_ring->vid |= FM10K_VLAN_CLEAR;
                else
                        rx_ring->vid &= ~FM10K_VLAN_CLEAR;
        }

        /* If our VLAN has been overridden, there is no reason to send VLAN
         * removal requests as they will be silently ignored.
         */
        if (hw->mac.vlan_override)
                return 0;

        /* Do not remove default VLAN ID related entries from VLAN and MAC
         * tables
         */
        if (!set && vid == hw->mac.default_vid)
                return 0;

        /* Do not throw an error if the interface is down. We will sync once
         * we come up
         */
        if (test_bit(__FM10K_DOWN, interface->state))
                return 0;

        fm10k_mbx_lock(interface);

        /* only need to update the VLAN if not in promiscuous mode */
        if (!(netdev->flags & IFF_PROMISC)) {
                err = fm10k_queue_vlan_request(interface, vid, 0, set);
                if (err)
                        goto err_out;
        }

        /* Update our base MAC address */
        err = fm10k_queue_mac_request(interface, interface->glort,
                                      hw->mac.addr, vid, set);
        if (err)
                goto err_out;

        /* Update L2 accelerated macvlan addresses */
        if (l2_accel) {
                for (i = 0; i < l2_accel->size; i++) {
                        struct net_device *sdev = l2_accel->macvlan[i];

                        if (!sdev)
                                continue;

                        glort = l2_accel->dglort + 1 + i;

                        fm10k_queue_mac_request(interface, glort,
                                                sdev->dev_addr,
                                                vid, set);
                }
        }

        /* set VLAN ID prior to syncing/unsyncing the VLAN */
        interface->vid = vid + (set ? VLAN_N_VID : 0);

        /* Update the unicast and multicast address list to add/drop VLAN */
        __dev_uc_unsync(netdev, fm10k_uc_vlan_unsync);
        __dev_mc_unsync(netdev, fm10k_mc_vlan_unsync);

err_out:
        fm10k_mbx_unlock(interface);

        return err;
}

static int fm10k_vlan_rx_add_vid(struct net_device *netdev,
                                 __always_unused __be16 proto, u16 vid)
{
        /* update VLAN and address table based on changes */
        return fm10k_update_vid(netdev, vid, true);
}

static int fm10k_vlan_rx_kill_vid(struct net_device *netdev,
                                  __always_unused __be16 proto, u16 vid)
{
        /* update VLAN and address table based on changes */
        return fm10k_update_vid(netdev, vid, false);
}

static u16 fm10k_find_next_vlan(struct fm10k_intfc *interface, u16 vid)
{
        struct fm10k_hw *hw = &interface->hw;
        u16 default_vid = hw->mac.default_vid;
        u16 vid_limit = vid < default_vid ? default_vid : VLAN_N_VID;

        vid = find_next_bit(interface->active_vlans, vid_limit, ++vid);

        return vid;
}

static void fm10k_clear_unused_vlans(struct fm10k_intfc *interface)
{
        u32 vid, prev_vid;

        /* loop through and find any gaps in the table */
        for (vid = 0, prev_vid = 0;
             prev_vid < VLAN_N_VID;
             prev_vid = vid + 1, vid = fm10k_find_next_vlan(interface, vid)) {
                if (prev_vid == vid)
                        continue;

                /* send request to clear multiple bits at a time */
                prev_vid += (vid - prev_vid - 1) << FM10K_VLAN_LENGTH_SHIFT;
                fm10k_queue_vlan_request(interface, prev_vid, 0, false);
        }
}

static int __fm10k_uc_sync(struct net_device *dev,
                           const unsigned char *addr, bool sync)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        u16 vid, glort = interface->glort;
        s32 err;

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

        for (vid = fm10k_find_next_vlan(interface, 0);
             vid < VLAN_N_VID;
             vid = fm10k_find_next_vlan(interface, vid)) {
                err = fm10k_queue_mac_request(interface, glort,
                                              addr, vid, sync);
                if (err)
                        return err;
        }

        return 0;
}

static int fm10k_uc_sync(struct net_device *dev,
                         const unsigned char *addr)
{
        return __fm10k_uc_sync(dev, addr, true);
}

static int fm10k_uc_unsync(struct net_device *dev,
                           const unsigned char *addr)
{
        return __fm10k_uc_sync(dev, addr, false);
}

static int fm10k_set_mac(struct net_device *dev, void *p)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        struct fm10k_hw *hw = &interface->hw;
        struct sockaddr *addr = p;
        s32 err = 0;

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

        if (dev->flags & IFF_UP) {
                /* setting MAC address requires mailbox */
                fm10k_mbx_lock(interface);

                err = fm10k_uc_sync(dev, addr->sa_data);
                if (!err)
                        fm10k_uc_unsync(dev, hw->mac.addr);

                fm10k_mbx_unlock(interface);
        }

        if (!err) {
                ether_addr_copy(dev->dev_addr, addr->sa_data);
                ether_addr_copy(hw->mac.addr, addr->sa_data);
                dev->addr_assign_type &= ~NET_ADDR_RANDOM;
        }

        /* if we had a mailbox error suggest trying again */
        return err ? -EAGAIN : 0;
}

static int __fm10k_mc_sync(struct net_device *dev,
                           const unsigned char *addr, bool sync)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        u16 vid, glort = interface->glort;
        s32 err;

        if (!is_multicast_ether_addr(addr))
                return -EADDRNOTAVAIL;

        for (vid = fm10k_find_next_vlan(interface, 0);
             vid < VLAN_N_VID;
             vid = fm10k_find_next_vlan(interface, vid)) {
                err = fm10k_queue_mac_request(interface, glort,
                                              addr, vid, sync);
                if (err)
                        return err;
        }

        return 0;
}

static int fm10k_mc_sync(struct net_device *dev,
                         const unsigned char *addr)
{
        return __fm10k_mc_sync(dev, addr, true);
}

static int fm10k_mc_unsync(struct net_device *dev,
                           const unsigned char *addr)
{
        return __fm10k_mc_sync(dev, addr, false);
}

static void fm10k_set_rx_mode(struct net_device *dev)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        struct fm10k_hw *hw = &interface->hw;
        int xcast_mode;

        /* no need to update the harwdare if we are not running */
        if (!(dev->flags & IFF_UP))
                return;

        /* determine new mode based on flags */
        xcast_mode = (dev->flags & IFF_PROMISC) ? FM10K_XCAST_MODE_PROMISC :
                     (dev->flags & IFF_ALLMULTI) ? FM10K_XCAST_MODE_ALLMULTI :
                     (dev->flags & (IFF_BROADCAST | IFF_MULTICAST)) ?
                     FM10K_XCAST_MODE_MULTI : FM10K_XCAST_MODE_NONE;

        fm10k_mbx_lock(interface);

        /* update xcast mode first, but only if it changed */
        if (interface->xcast_mode != xcast_mode) {
                /* update VLAN table when entering promiscuous mode */
                if (xcast_mode == FM10K_XCAST_MODE_PROMISC)
                        fm10k_queue_vlan_request(interface, FM10K_VLAN_ALL,
                                                 0, true);

                /* clear VLAN table when exiting promiscuous mode */
                if (interface->xcast_mode == FM10K_XCAST_MODE_PROMISC)
                        fm10k_clear_unused_vlans(interface);

                /* update xcast mode if host's mailbox is ready */
                if (fm10k_host_mbx_ready(interface))
                        hw->mac.ops.update_xcast_mode(hw, interface->glort,
                                                      xcast_mode);

                /* record updated xcast mode state */
                interface->xcast_mode = xcast_mode;
        }

        /* synchronize all of the addresses */
        __dev_uc_sync(dev, fm10k_uc_sync, fm10k_uc_unsync);
        __dev_mc_sync(dev, fm10k_mc_sync, fm10k_mc_unsync);

        fm10k_mbx_unlock(interface);
}

void fm10k_restore_rx_state(struct fm10k_intfc *interface)
{
        struct fm10k_l2_accel *l2_accel = interface->l2_accel;
        struct net_device *netdev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int xcast_mode, i;
        u16 vid, glort;

        /* record glort for this interface */
        glort = interface->glort;

        /* convert interface flags to xcast mode */
        if (netdev->flags & IFF_PROMISC)
                xcast_mode = FM10K_XCAST_MODE_PROMISC;
        else if (netdev->flags & IFF_ALLMULTI)
                xcast_mode = FM10K_XCAST_MODE_ALLMULTI;
        else if (netdev->flags & (IFF_BROADCAST | IFF_MULTICAST))
                xcast_mode = FM10K_XCAST_MODE_MULTI;
        else
                xcast_mode = FM10K_XCAST_MODE_NONE;

        fm10k_mbx_lock(interface);

        /* Enable logical port if host's mailbox is ready */
        if (fm10k_host_mbx_ready(interface))
                hw->mac.ops.update_lport_state(hw, glort,
                                               interface->glort_count, true);

        /* update VLAN table */
        fm10k_queue_vlan_request(interface, FM10K_VLAN_ALL, 0,
                                 xcast_mode == FM10K_XCAST_MODE_PROMISC);

        /* update table with current entries */
        for (vid = fm10k_find_next_vlan(interface, 0);
             vid < VLAN_N_VID;
             vid = fm10k_find_next_vlan(interface, vid)) {
                fm10k_queue_vlan_request(interface, vid, 0, true);

                fm10k_queue_mac_request(interface, glort,
                                        hw->mac.addr, vid, true);

                /* synchronize macvlan addresses */
                if (l2_accel) {
                        for (i = 0; i < l2_accel->size; i++) {
                                struct net_device *sdev = l2_accel->macvlan[i];

                                if (!sdev)
                                        continue;

                                glort = l2_accel->dglort + 1 + i;

                                fm10k_queue_mac_request(interface, glort,
                                                        sdev->dev_addr,
                                                        vid, true);
                        }
                }
        }

        /* update xcast mode before synchronizing addresses if host's mailbox
         * is ready
         */
        if (fm10k_host_mbx_ready(interface))
                hw->mac.ops.update_xcast_mode(hw, glort, xcast_mode);

        /* synchronize all of the addresses */
        __dev_uc_sync(netdev, fm10k_uc_sync, fm10k_uc_unsync);
        __dev_mc_sync(netdev, fm10k_mc_sync, fm10k_mc_unsync);

        /* synchronize macvlan addresses */
        if (l2_accel) {
                for (i = 0; i < l2_accel->size; i++) {
                        struct net_device *sdev = l2_accel->macvlan[i];

                        if (!sdev)
                                continue;

                        glort = l2_accel->dglort + 1 + i;

                        hw->mac.ops.update_xcast_mode(hw, glort,
                                                      FM10K_XCAST_MODE_NONE);
                        fm10k_queue_mac_request(interface, glort,
                                                sdev->dev_addr,
                                                hw->mac.default_vid, true);
                }
        }

        fm10k_mbx_unlock(interface);

        /* record updated xcast mode state */
        interface->xcast_mode = xcast_mode;

        /* Restore tunnel configuration */
        fm10k_restore_udp_port_info(interface);
}

void fm10k_reset_rx_state(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;

        /* Wait for MAC/VLAN work to finish */
        while (test_bit(__FM10K_MACVLAN_SCHED, interface->state))
                usleep_range(1000, 2000);

        /* Cancel pending MAC/VLAN requests */
        fm10k_clear_macvlan_queue(interface, interface->glort, true);

        fm10k_mbx_lock(interface);

        /* clear the logical port state on lower device if host's mailbox is
         * ready
         */
        if (fm10k_host_mbx_ready(interface))
                hw->mac.ops.update_lport_state(hw, interface->glort,
                                               interface->glort_count, false);

        fm10k_mbx_unlock(interface);

        /* reset flags to default state */
        interface->xcast_mode = FM10K_XCAST_MODE_NONE;

        /* clear the sync flag since the lport has been dropped */
        __dev_uc_unsync(netdev, NULL);
        __dev_mc_unsync(netdev, NULL);
}

/**
 * fm10k_get_stats64 - Get System Network Statistics
 * @netdev: network interface device structure
 * @stats: storage space for 64bit statistics
 *
 * Obtain 64bit statistics in a way that is safe for both 32bit and 64bit
 * architectures.
 */
static void fm10k_get_stats64(struct net_device *netdev,
                              struct rtnl_link_stats64 *stats)
{
        struct fm10k_intfc *interface = netdev_priv(netdev);
        struct fm10k_ring *ring;
        unsigned int start, i;
        u64 bytes, packets;

        rcu_read_lock();

        for (i = 0; i < interface->num_rx_queues; i++) {
                ring = READ_ONCE(interface->rx_ring[i]);

                if (!ring)
                        continue;

                do {
                        start = u64_stats_fetch_begin_irq(&ring->syncp);
                        packets = ring->stats.packets;
                        bytes   = ring->stats.bytes;
                } while (u64_stats_fetch_retry_irq(&ring->syncp, start));

                stats->rx_packets += packets;
                stats->rx_bytes   += bytes;
        }

        for (i = 0; i < interface->num_tx_queues; i++) {
                ring = READ_ONCE(interface->tx_ring[i]);

                if (!ring)
                        continue;

                do {
                        start = u64_stats_fetch_begin_irq(&ring->syncp);
                        packets = ring->stats.packets;
                        bytes   = ring->stats.bytes;
                } while (u64_stats_fetch_retry_irq(&ring->syncp, start));

                stats->tx_packets += packets;
                stats->tx_bytes   += bytes;
        }

        rcu_read_unlock();

        /* following stats updated by fm10k_service_task() */
        stats->rx_missed_errors = netdev->stats.rx_missed_errors;
}

int fm10k_setup_tc(struct net_device *dev, u8 tc)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        int err;

        /* Currently only the PF supports priority classes */
        if (tc && (interface->hw.mac.type != fm10k_mac_pf))
                return -EINVAL;

        /* Hardware supports up to 8 traffic classes */
        if (tc > 8)
                return -EINVAL;

        /* Hardware has to reinitialize queues to match packet
         * buffer alignment. Unfortunately, the hardware is not
         * flexible enough to do this dynamically.
         */
        if (netif_running(dev))
                fm10k_close(dev);

        fm10k_mbx_free_irq(interface);

        fm10k_clear_queueing_scheme(interface);

        /* we expect the prio_tc map to be repopulated later */
        netdev_reset_tc(dev);
        netdev_set_num_tc(dev, tc);

        err = fm10k_init_queueing_scheme(interface);
        if (err)
                goto err_queueing_scheme;

        err = fm10k_mbx_request_irq(interface);
        if (err)
                goto err_mbx_irq;

        err = netif_running(dev) ? fm10k_open(dev) : 0;
        if (err)
                goto err_open;

        /* flag to indicate SWPRI has yet to be updated */
        set_bit(FM10K_FLAG_SWPRI_CONFIG, interface->flags);

        return 0;
err_open:
        fm10k_mbx_free_irq(interface);
err_mbx_irq:
        fm10k_clear_queueing_scheme(interface);
err_queueing_scheme:
        netif_device_detach(dev);

        return err;
}

static int __fm10k_setup_tc(struct net_device *dev, enum tc_setup_type type,
                            void *type_data)
{
        struct tc_mqprio_qopt *mqprio = type_data;

        if (type != TC_SETUP_QDISC_MQPRIO)
                return -EOPNOTSUPP;

        mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;

        return fm10k_setup_tc(dev, mqprio->num_tc);
}

static void fm10k_assign_l2_accel(struct fm10k_intfc *interface,
                                  struct fm10k_l2_accel *l2_accel)
{
        int i;

        for (i = 0; i < interface->num_rx_queues; i++) {
                struct fm10k_ring *ring = interface->rx_ring[i];

                rcu_assign_pointer(ring->l2_accel, l2_accel);
        }

        interface->l2_accel = l2_accel;
}

static void *fm10k_dfwd_add_station(struct net_device *dev,
                                    struct net_device *sdev)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        struct fm10k_l2_accel *l2_accel = interface->l2_accel;
        struct fm10k_l2_accel *old_l2_accel = NULL;
        struct fm10k_dglort_cfg dglort = { 0 };
        struct fm10k_hw *hw = &interface->hw;
        int size, i;
        u16 vid, glort;

        /* The hardware supported by fm10k only filters on the destination MAC
         * address. In order to avoid issues we only support offloading modes
         * where the hardware can actually provide the functionality.
         */
        if (!macvlan_supports_dest_filter(sdev))
                return ERR_PTR(-EMEDIUMTYPE);

        /* allocate l2 accel structure if it is not available */
        if (!l2_accel) {
                /* verify there is enough free GLORTs to support l2_accel */
                if (interface->glort_count < 7)
                        return ERR_PTR(-EBUSY);

                size = offsetof(struct fm10k_l2_accel, macvlan[7]);
                l2_accel = kzalloc(size, GFP_KERNEL);
                if (!l2_accel)
                        return ERR_PTR(-ENOMEM);

                l2_accel->size = 7;
                l2_accel->dglort = interface->glort;

                /* update pointers */
                fm10k_assign_l2_accel(interface, l2_accel);
        /* do not expand if we are at our limit */
        } else if ((l2_accel->count == FM10K_MAX_STATIONS) ||
                   (l2_accel->count == (interface->glort_count - 1))) {
                return ERR_PTR(-EBUSY);
        /* expand if we have hit the size limit */
        } else if (l2_accel->count == l2_accel->size) {
                old_l2_accel = l2_accel;
                size = offsetof(struct fm10k_l2_accel,
                                macvlan[(l2_accel->size * 2) + 1]);
                l2_accel = kzalloc(size, GFP_KERNEL);
                if (!l2_accel)
                        return ERR_PTR(-ENOMEM);

                memcpy(l2_accel, old_l2_accel,
                       offsetof(struct fm10k_l2_accel,
                                macvlan[old_l2_accel->size]));

                l2_accel->size = (old_l2_accel->size * 2) + 1;

                /* update pointers */
                fm10k_assign_l2_accel(interface, l2_accel);
                kfree_rcu(old_l2_accel, rcu);
        }

        /* add macvlan to accel table, and record GLORT for position */
        for (i = 0; i < l2_accel->size; i++) {
                if (!l2_accel->macvlan[i])
                        break;
        }

        /* record station */
        l2_accel->macvlan[i] = sdev;
        l2_accel->count++;

        /* configure default DGLORT mapping for RSS/DCB */
        dglort.idx = fm10k_dglort_pf_rss;
        dglort.inner_rss = 1;
        dglort.rss_l = fls(interface->ring_feature[RING_F_RSS].mask);
        dglort.pc_l = fls(interface->ring_feature[RING_F_QOS].mask);
        dglort.glort = interface->glort;
        dglort.shared_l = fls(l2_accel->size);
        hw->mac.ops.configure_dglort_map(hw, &dglort);

        /* Add rules for this specific dglort to the switch */
        fm10k_mbx_lock(interface);

        glort = l2_accel->dglort + 1 + i;

        if (fm10k_host_mbx_ready(interface))
                hw->mac.ops.update_xcast_mode(hw, glort,
                                              FM10K_XCAST_MODE_NONE);

        fm10k_queue_mac_request(interface, glort, sdev->dev_addr,
                                hw->mac.default_vid, true);

        for (vid = fm10k_find_next_vlan(interface, 0);
             vid < VLAN_N_VID;
             vid = fm10k_find_next_vlan(interface, vid))
                fm10k_queue_mac_request(interface, glort, sdev->dev_addr,
                                        vid, true);

        fm10k_mbx_unlock(interface);

        return sdev;
}

static void fm10k_dfwd_del_station(struct net_device *dev, void *priv)
{
        struct fm10k_intfc *interface = netdev_priv(dev);
        struct fm10k_l2_accel *l2_accel = READ_ONCE(interface->l2_accel);
        struct fm10k_dglort_cfg dglort = { 0 };
        struct fm10k_hw *hw = &interface->hw;
        struct net_device *sdev = priv;
        u16 vid, glort;
        int i;

        if (!l2_accel)
                return;

        /* search table for matching interface */
        for (i = 0; i < l2_accel->size; i++) {
                if (l2_accel->macvlan[i] == sdev)
                        break;
        }

        /* exit if macvlan not found */
        if (i == l2_accel->size)
                return;

        /* Remove any rules specific to this dglort */
        fm10k_mbx_lock(interface);

        glort = l2_accel->dglort + 1 + i;

        if (fm10k_host_mbx_ready(interface))
                hw->mac.ops.update_xcast_mode(hw, glort,
                                              FM10K_XCAST_MODE_NONE);

        fm10k_queue_mac_request(interface, glort, sdev->dev_addr,
                                hw->mac.default_vid, false);

        for (vid = fm10k_find_next_vlan(interface, 0);
             vid < VLAN_N_VID;
             vid = fm10k_find_next_vlan(interface, vid))
                fm10k_queue_mac_request(interface, glort, sdev->dev_addr,
                                        vid, false);

        fm10k_mbx_unlock(interface);

        /* record removal */
        l2_accel->macvlan[i] = NULL;
        l2_accel->count--;

        /* configure default DGLORT mapping for RSS/DCB */
        dglort.idx = fm10k_dglort_pf_rss;
        dglort.inner_rss = 1;
        dglort.rss_l = fls(interface->ring_feature[RING_F_RSS].mask);
        dglort.pc_l = fls(interface->ring_feature[RING_F_QOS].mask);
        dglort.glort = interface->glort;
        dglort.shared_l = fls(l2_accel->size);
        hw->mac.ops.configure_dglort_map(hw, &dglort);

        /* If table is empty remove it */
        if (l2_accel->count == 0) {
                fm10k_assign_l2_accel(interface, NULL);
                kfree_rcu(l2_accel, rcu);
        }
}

static netdev_features_t fm10k_features_check(struct sk_buff *skb,
                                              struct net_device *dev,
                                              netdev_features_t features)
{
        if (!skb->encapsulation || fm10k_tx_encap_offload(skb))
                return features;

        return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
}

static const struct net_device_ops fm10k_netdev_ops = {
        .ndo_open               = fm10k_open,
        .ndo_stop               = fm10k_close,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_start_xmit         = fm10k_xmit_frame,
        .ndo_set_mac_address    = fm10k_set_mac,
        .ndo_tx_timeout         = fm10k_tx_timeout,
        .ndo_vlan_rx_add_vid    = fm10k_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = fm10k_vlan_rx_kill_vid,
        .ndo_set_rx_mode        = fm10k_set_rx_mode,
        .ndo_get_stats64        = fm10k_get_stats64,
        .ndo_setup_tc           = __fm10k_setup_tc,
        .ndo_set_vf_mac         = fm10k_ndo_set_vf_mac,
        .ndo_set_vf_vlan        = fm10k_ndo_set_vf_vlan,
        .ndo_set_vf_rate        = fm10k_ndo_set_vf_bw,
        .ndo_get_vf_config      = fm10k_ndo_get_vf_config,
        .ndo_get_vf_stats       = fm10k_ndo_get_vf_stats,
        .ndo_udp_tunnel_add     = fm10k_udp_tunnel_add,
        .ndo_udp_tunnel_del     = fm10k_udp_tunnel_del,
        .ndo_dfwd_add_station   = fm10k_dfwd_add_station,
        .ndo_dfwd_del_station   = fm10k_dfwd_del_station,
        .ndo_features_check     = fm10k_features_check,
};

#define DEFAULT_DEBUG_LEVEL_SHIFT 3

struct net_device *fm10k_alloc_netdev(const struct fm10k_info *info)
{
        netdev_features_t hw_features;
        struct fm10k_intfc *interface;
        struct net_device *dev;

        dev = alloc_etherdev_mq(sizeof(struct fm10k_intfc), MAX_QUEUES);
        if (!dev)
                return NULL;

        /* set net device and ethtool ops */
        dev->netdev_ops = &fm10k_netdev_ops;
        fm10k_set_ethtool_ops(dev);

        /* configure default debug level */
        interface = netdev_priv(dev);
        interface->msg_enable = BIT(DEFAULT_DEBUG_LEVEL_SHIFT) - 1;

        /* configure default features */
        dev->features |= NETIF_F_IP_CSUM |
                         NETIF_F_IPV6_CSUM |
                         NETIF_F_SG |
                         NETIF_F_TSO |
                         NETIF_F_TSO6 |
                         NETIF_F_TSO_ECN |
                         NETIF_F_RXHASH |
                         NETIF_F_RXCSUM;

        /* Only the PF can support VXLAN and NVGRE tunnel offloads */
        if (info->mac == fm10k_mac_pf) {
                dev->hw_enc_features = NETIF_F_IP_CSUM |
                                       NETIF_F_TSO |
                                       NETIF_F_TSO6 |
                                       NETIF_F_TSO_ECN |
                                       NETIF_F_GSO_UDP_TUNNEL |
                                       NETIF_F_IPV6_CSUM |
                                       NETIF_F_SG;

                dev->features |= NETIF_F_GSO_UDP_TUNNEL;
        }

        /* all features defined to this point should be changeable */
        hw_features = dev->features;

        /* allow user to enable L2 forwarding acceleration */
        hw_features |= NETIF_F_HW_L2FW_DOFFLOAD;

        /* configure VLAN features */
        dev->vlan_features |= dev->features;

        /* we want to leave these both on as we cannot disable VLAN tag
         * insertion or stripping on the hardware since it is contained
         * in the FTAG and not in the frame itself.
         */
        dev->features |= NETIF_F_HW_VLAN_CTAG_TX |
                         NETIF_F_HW_VLAN_CTAG_RX |
                         NETIF_F_HW_VLAN_CTAG_FILTER;

        dev->priv_flags |= IFF_UNICAST_FLT;

        dev->hw_features |= hw_features;

        /* MTU range: 68 - 15342 */
        dev->min_mtu = ETH_MIN_MTU;
        dev->max_mtu = FM10K_MAX_JUMBO_FRAME_SIZE;

        return dev;
}