/*
 * Copyright (c) 2007, 2014 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <sys/types.h>
#include <linux/if_vlan.h>

#include <dev/mlx4/device.h>
#include <dev/mlx4/cmd.h>

#include "en_port.h"
#include "en.h"


int mlx4_SET_VLAN_FLTR(struct mlx4_dev *dev, struct mlx4_en_priv *priv)
{
        struct mlx4_cmd_mailbox *mailbox;
        struct mlx4_set_vlan_fltr_mbox *filter;
        int i;
        int j;
        int index = 0;
        u32 entry;
        int err = 0;

        mailbox = mlx4_alloc_cmd_mailbox(dev);
        if (IS_ERR(mailbox))
                return PTR_ERR(mailbox);

        filter = mailbox->buf;
        for (i = VLAN_FLTR_SIZE - 1; i >= 0; i--) {
                entry = 0;
                for (j = 0; j < 32; j++) {
                        if (test_bit(index, priv->active_vlans))
                                entry |= 1 << j;
                        index++;
                }
                filter->entry[i] = cpu_to_be32(entry);
        }
        err = mlx4_cmd(dev, mailbox->dma, priv->port, 0, MLX4_CMD_SET_VLAN_FLTR,
                       MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);
        mlx4_free_cmd_mailbox(dev, mailbox);
        return err;
}

int mlx4_en_QUERY_PORT(struct mlx4_en_dev *mdev, u8 port)
{
        struct mlx4_en_query_port_context *qport_context;
        struct mlx4_en_priv *priv = mlx4_netdev_priv(mdev->pndev[port]);
        struct mlx4_en_port_state *state = &priv->port_state;
        struct mlx4_cmd_mailbox *mailbox;
        int err;

        mailbox = mlx4_alloc_cmd_mailbox(mdev->dev);
        if (IS_ERR(mailbox))
                return PTR_ERR(mailbox);
        err = mlx4_cmd_box(mdev->dev, 0, mailbox->dma, port, 0,
                           MLX4_CMD_QUERY_PORT, MLX4_CMD_TIME_CLASS_B,
                           MLX4_CMD_WRAPPED);
        if (err)
                goto out;
        qport_context = mailbox->buf;

        /* This command is always accessed from Ethtool context
         * already synchronized, no need in locking */
        state->link_state = !!(qport_context->link_up & MLX4_EN_LINK_UP_MASK);
        switch (qport_context->link_speed & MLX4_EN_SPEED_MASK) {
        case MLX4_EN_100M_SPEED:
                state->link_speed = 100;
                break;
        case MLX4_EN_1G_SPEED:
                state->link_speed = 1000;
                break;
        case MLX4_EN_10G_SPEED_XAUI:
        case MLX4_EN_10G_SPEED_XFI:
                state->link_speed = 10000;
                break;
        case MLX4_EN_20G_SPEED:
                state->link_speed = 20000;
                break;
        case MLX4_EN_40G_SPEED:
                state->link_speed = 40000;
                break;
        case MLX4_EN_56G_SPEED:
                state->link_speed = 56000;
                break;
        default:
                state->link_speed = -1;
                break;
        }

        state->transceiver = qport_context->transceiver;

        state->flags = 0; /* Reset and recalculate the port flags */
        state->flags |= (qport_context->link_up & MLX4_EN_ANC_MASK) ?
                MLX4_EN_PORT_ANC : 0;
        state->flags |= (qport_context->autoneg & MLX4_EN_AUTONEG_MASK) ?
                MLX4_EN_PORT_ANE : 0;

out:
        mlx4_free_cmd_mailbox(mdev->dev, mailbox);
        return err;
}

/* Each counter set is located in struct mlx4_en_stat_out_mbox
 * with a const offset between its prio components.
 * This function runs over a counter set and sum all of it's prio components.
 */
static u64 en_stats_adder(__be64 *start, __be64 *next, int num)
{
        __be64 *curr = start;
        u64 ret = 0;
        int i;
        int offset = next - start;

        for (i = 0; i < num; i++) {
                ret += be64_to_cpu(*curr);
                curr += offset;
        }

        return ret;
}

static void mlx4_en_fold_software_stats(if_t dev)
{
        struct mlx4_en_priv *priv = mlx4_netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        u64 packets, bytes;
        int i;

        if (!priv->port_up || mlx4_is_master(mdev->dev))
                return;

        packets = 0;
        bytes = 0;
        for (i = 0; i < priv->rx_ring_num; i++) {
                const struct mlx4_en_rx_ring *ring = priv->rx_ring[i];

                packets += READ_ONCE(ring->packets);
                bytes += READ_ONCE(ring->bytes);
        }
        priv->pkstats.rx_packets = packets;
        priv->pkstats.rx_bytes = bytes;

        packets = 0;
        bytes = 0;
        for (i = 0; i < priv->tx_ring_num; i++) {
                const struct mlx4_en_tx_ring *ring = priv->tx_ring[i];

                packets += READ_ONCE(ring->packets);
                bytes += READ_ONCE(ring->bytes);
        }
        priv->pkstats.tx_packets = packets;
        priv->pkstats.tx_bytes = bytes;
}

int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
{
        struct mlx4_counter tmp_vport_stats;
        struct mlx4_en_stat_out_mbox *mlx4_en_stats;
        struct mlx4_en_stat_out_flow_control_mbox *flowstats;
        if_t dev = mdev->pndev[port];
        struct mlx4_en_priv *priv = mlx4_netdev_priv(dev);
        struct mlx4_en_vport_stats *vport_stats = &priv->vport_stats;
        struct mlx4_cmd_mailbox *mailbox;
        u64 in_mod = reset << 8 | port;
        int err;
        int i, counter_index;

        mailbox = mlx4_alloc_cmd_mailbox(mdev->dev);
        if (IS_ERR(mailbox))
                return PTR_ERR(mailbox);
        err = mlx4_cmd_box(mdev->dev, 0, mailbox->dma, in_mod, 0,
                           MLX4_CMD_DUMP_ETH_STATS, MLX4_CMD_TIME_CLASS_B,
                           MLX4_CMD_NATIVE);
        if (err)
                goto out;

        mlx4_en_stats = mailbox->buf;

        spin_lock(&priv->stats_lock);

        priv->port_stats.rx_chksum_good = 0;
        priv->port_stats.rx_chksum_none = 0;
        for (i = 0; i < priv->rx_ring_num; i++) {
                priv->port_stats.rx_chksum_good += priv->rx_ring[i]->csum_ok;
                priv->port_stats.rx_chksum_none += priv->rx_ring[i]->csum_none;
        }
        priv->port_stats.tx_chksum_offload = 0;
        priv->port_stats.queue_stopped = 0;
        priv->port_stats.wake_queue = 0;
        priv->port_stats.oversized_packets = 0;
        priv->port_stats.tso_packets = 0;
        priv->port_stats.defrag_attempts = 0;

        for (i = 0; i < priv->tx_ring_num; i++) {
                const struct mlx4_en_tx_ring *ring;
                ring = priv->tx_ring[i];

                priv->port_stats.tx_chksum_offload += ring->tx_csum;
                priv->port_stats.queue_stopped     += ring->queue_stopped;
                priv->port_stats.wake_queue        += ring->wake_queue;
                priv->port_stats.oversized_packets += ring->oversized_packets;
                priv->port_stats.tso_packets       += ring->tso_packets;
                priv->port_stats.defrag_attempts   += ring->defrag_attempts;
        }

        priv->pkstats.rx_errors =
                           be64_to_cpu(mlx4_en_stats->PCS) +
                           be32_to_cpu(mlx4_en_stats->RJBBR) +
                           be32_to_cpu(mlx4_en_stats->RCRC) +
                           be32_to_cpu(mlx4_en_stats->RRUNT) +
                           be64_to_cpu(mlx4_en_stats->RInRangeLengthErr) +
                           be64_to_cpu(mlx4_en_stats->ROutRangeLengthErr) +
                           be32_to_cpu(mlx4_en_stats->RSHORT) +
                           en_stats_adder(&mlx4_en_stats->RGIANT_prio_0,
                                          &mlx4_en_stats->RGIANT_prio_1,
                                          NUM_PRIORITIES);
        priv->pkstats.tx_errors =
            en_stats_adder(&mlx4_en_stats->TGIANT_prio_0,
                                          &mlx4_en_stats->TGIANT_prio_1,
                                          NUM_PRIORITIES);
        priv->pkstats.rx_multicast_packets =
            en_stats_adder(&mlx4_en_stats->MCAST_prio_0,
                                          &mlx4_en_stats->MCAST_prio_1,
                                          NUM_PRIORITIES);
        priv->pkstats.rx_dropped = be32_to_cpu(mlx4_en_stats->RDROP);
        priv->pkstats.rx_length_errors = be32_to_cpu(mlx4_en_stats->RdropLength);
        priv->pkstats.rx_over_errors = be32_to_cpu(mlx4_en_stats->RdropOvflw);
        priv->pkstats.rx_crc_errors = be32_to_cpu(mlx4_en_stats->RCRC);
        priv->pkstats.tx_dropped = be32_to_cpu(mlx4_en_stats->TDROP);

        /* RX stats */
        priv->pkstats.rx_packets = en_stats_adder(&mlx4_en_stats->RTOT_prio_0,
                                           &mlx4_en_stats->RTOT_prio_1,
                                           NUM_PRIORITIES);
        priv->pkstats.rx_bytes = en_stats_adder(&mlx4_en_stats->ROCT_prio_0,
                                         &mlx4_en_stats->ROCT_prio_1,
                                         NUM_PRIORITIES);
        priv->pkstats.rx_broadcast_packets =
                        en_stats_adder(&mlx4_en_stats->RBCAST_prio_0,
                                       &mlx4_en_stats->RBCAST_prio_1,
                                       NUM_PRIORITIES);
        priv->pkstats.rx_jabbers = be32_to_cpu(mlx4_en_stats->RJBBR);
        priv->pkstats.rx_in_range_length_error =
                be64_to_cpu(mlx4_en_stats->RInRangeLengthErr);
        priv->pkstats.rx_out_range_length_error =
                be64_to_cpu(mlx4_en_stats->ROutRangeLengthErr);

        /* Tx stats */
        priv->pkstats.tx_packets = en_stats_adder(&mlx4_en_stats->TTOT_prio_0,
                                           &mlx4_en_stats->TTOT_prio_1,
                                           NUM_PRIORITIES);
        priv->pkstats.tx_bytes = en_stats_adder(&mlx4_en_stats->TOCT_prio_0,
                                         &mlx4_en_stats->TOCT_prio_1,
                                         NUM_PRIORITIES);
        priv->pkstats.tx_multicast_packets =
                en_stats_adder(&mlx4_en_stats->TMCAST_prio_0,
                               &mlx4_en_stats->TMCAST_prio_1,
                               NUM_PRIORITIES);
        priv->pkstats.tx_broadcast_packets =
                en_stats_adder(&mlx4_en_stats->TBCAST_prio_0,
                               &mlx4_en_stats->TBCAST_prio_1,
                               NUM_PRIORITIES);

        priv->pkstats.rx_prio[0][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_0);
        priv->pkstats.rx_prio[0][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_0);
        priv->pkstats.rx_prio[1][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_1);
        priv->pkstats.rx_prio[1][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_1);
        priv->pkstats.rx_prio[2][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_2);
        priv->pkstats.rx_prio[2][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_2);
        priv->pkstats.rx_prio[3][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_3);
        priv->pkstats.rx_prio[3][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_3);
        priv->pkstats.rx_prio[4][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_4);
        priv->pkstats.rx_prio[4][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_4);
        priv->pkstats.rx_prio[5][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_5);
        priv->pkstats.rx_prio[5][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_5);
        priv->pkstats.rx_prio[6][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_6);
        priv->pkstats.rx_prio[6][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_6);
        priv->pkstats.rx_prio[7][0] = be64_to_cpu(mlx4_en_stats->RTOT_prio_7);
        priv->pkstats.rx_prio[7][1] = be64_to_cpu(mlx4_en_stats->ROCT_prio_7);
        priv->pkstats.rx_prio[8][0] = be64_to_cpu(mlx4_en_stats->RTOT_novlan);
        priv->pkstats.rx_prio[8][1] = be64_to_cpu(mlx4_en_stats->ROCT_novlan);
        priv->pkstats.tx_prio[0][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_0);
        priv->pkstats.tx_prio[0][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_0);
        priv->pkstats.tx_prio[1][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_1);
        priv->pkstats.tx_prio[1][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_1);
        priv->pkstats.tx_prio[2][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_2);
        priv->pkstats.tx_prio[2][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_2);
        priv->pkstats.tx_prio[3][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_3);
        priv->pkstats.tx_prio[3][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_3);
        priv->pkstats.tx_prio[4][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_4);
        priv->pkstats.tx_prio[4][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_4);
        priv->pkstats.tx_prio[5][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_5);
        priv->pkstats.tx_prio[5][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_5);
        priv->pkstats.tx_prio[6][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_6);
        priv->pkstats.tx_prio[6][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_6);
        priv->pkstats.tx_prio[7][0] = be64_to_cpu(mlx4_en_stats->TTOT_prio_7);
        priv->pkstats.tx_prio[7][1] = be64_to_cpu(mlx4_en_stats->TOCT_prio_7);
        priv->pkstats.tx_prio[8][0] = be64_to_cpu(mlx4_en_stats->TTOT_novlan);
        priv->pkstats.tx_prio[8][1] = be64_to_cpu(mlx4_en_stats->TOCT_novlan);

        mlx4_en_fold_software_stats(dev);

        spin_unlock(&priv->stats_lock);

        memset(&tmp_vport_stats, 0, sizeof(tmp_vport_stats));
        counter_index = mlx4_get_default_counter_index(mdev->dev, port);
        err = mlx4_get_counter_stats(mdev->dev, counter_index,
                                     &tmp_vport_stats, reset);

        spin_lock(&priv->stats_lock);
        if (!err) {
                /* ethtool stats format */
                vport_stats->rx_bytes = be64_to_cpu(tmp_vport_stats.rx_bytes);
                vport_stats->rx_frames = be64_to_cpu(tmp_vport_stats.rx_frames);
                vport_stats->tx_bytes = be64_to_cpu(tmp_vport_stats.tx_bytes);
                vport_stats->tx_frames = be64_to_cpu(tmp_vport_stats.tx_frames);
        }

        if (reset == 0) {
                if_inc_counter(dev, IFCOUNTER_IPACKETS,
                    priv->pkstats.rx_packets - priv->pkstats_last.rx_packets);
                if_inc_counter(dev, IFCOUNTER_OPACKETS,
                    priv->pkstats.tx_packets - priv->pkstats_last.tx_packets);
                if_inc_counter(dev, IFCOUNTER_IBYTES,
                    priv->pkstats.rx_bytes - priv->pkstats_last.rx_bytes);
                if_inc_counter(dev, IFCOUNTER_OBYTES,
                    priv->pkstats.tx_bytes - priv->pkstats_last.tx_bytes);
                if_inc_counter(dev, IFCOUNTER_IERRORS,
                    priv->pkstats.rx_errors - priv->pkstats_last.rx_errors);
                if_inc_counter(dev, IFCOUNTER_IQDROPS,
                    priv->pkstats.rx_dropped - priv->pkstats_last.rx_dropped);
                if_inc_counter(dev, IFCOUNTER_IMCASTS,
                    priv->pkstats.rx_multicast_packets - priv->pkstats_last.rx_multicast_packets);
                if_inc_counter(dev, IFCOUNTER_OMCASTS,
                    priv->pkstats.tx_multicast_packets - priv->pkstats_last.tx_multicast_packets);
        }
        priv->pkstats_last = priv->pkstats;

        spin_unlock(&priv->stats_lock);

        /* 0xffs indicates invalid value */
        memset(mailbox->buf, 0xff, sizeof(*flowstats) * MLX4_NUM_PRIORITIES);

        if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_FLOWSTATS_EN) {
                memset(mailbox->buf, 0,
                       sizeof(*flowstats) * MLX4_NUM_PRIORITIES);
                err = mlx4_cmd_box(mdev->dev, 0, mailbox->dma,
                                   in_mod | MLX4_DUMP_ETH_STATS_FLOW_CONTROL,
                                   0, MLX4_CMD_DUMP_ETH_STATS,
                                   MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
                if (err)
                        goto out;
        }

        flowstats = mailbox->buf;

        spin_lock(&priv->stats_lock);

        for (i = 0; i < MLX4_NUM_PRIORITIES; i++)       {
                priv->rx_priority_flowstats[i].rx_pause =
                        be64_to_cpu(flowstats[i].rx_pause);
                priv->rx_priority_flowstats[i].rx_pause_duration =
                        be64_to_cpu(flowstats[i].rx_pause_duration);
                priv->rx_priority_flowstats[i].rx_pause_transition =
                        be64_to_cpu(flowstats[i].rx_pause_transition);
                priv->tx_priority_flowstats[i].tx_pause =
                        be64_to_cpu(flowstats[i].tx_pause);
                priv->tx_priority_flowstats[i].tx_pause_duration =
                        be64_to_cpu(flowstats[i].tx_pause_duration);
                priv->tx_priority_flowstats[i].tx_pause_transition =
                        be64_to_cpu(flowstats[i].tx_pause_transition);
        }

        /* if pfc is not in use, all priorities counters have the same value */
        priv->rx_flowstats.rx_pause =
                be64_to_cpu(flowstats[0].rx_pause);
        priv->rx_flowstats.rx_pause_duration =
                be64_to_cpu(flowstats[0].rx_pause_duration);
        priv->rx_flowstats.rx_pause_transition =
                be64_to_cpu(flowstats[0].rx_pause_transition);
        priv->tx_flowstats.tx_pause =
                be64_to_cpu(flowstats[0].tx_pause);
        priv->tx_flowstats.tx_pause_duration =
                be64_to_cpu(flowstats[0].tx_pause_duration);
        priv->tx_flowstats.tx_pause_transition =
                be64_to_cpu(flowstats[0].tx_pause_transition);

        spin_unlock(&priv->stats_lock);

out:
        mlx4_free_cmd_mailbox(mdev->dev, mailbox);
        return err;
}

int mlx4_en_get_vport_stats(struct mlx4_en_dev *mdev, u8 port)
{
        struct mlx4_en_priv *priv = mlx4_netdev_priv(mdev->pndev[port]);
        struct mlx4_counter tmp_vport_stats;
        struct mlx4_en_vf_stats *vf_stats = &priv->vf_stats;
        int err, i, counter_index;

        spin_lock(&priv->stats_lock);

        priv->pkstats.rx_packets = 0;
        priv->pkstats.rx_bytes = 0;
        priv->port_stats.rx_chksum_good = 0;
        priv->port_stats.rx_chksum_none = 0;
        for (i = 0; i < priv->rx_ring_num; i++) {
                priv->pkstats.rx_packets += priv->rx_ring[i]->packets;
                priv->pkstats.rx_bytes += priv->rx_ring[i]->bytes;
                priv->port_stats.rx_chksum_good += priv->rx_ring[i]->csum_ok;
                priv->port_stats.rx_chksum_none += priv->rx_ring[i]->csum_none;
        }
        priv->pkstats.tx_packets = 0;
        priv->pkstats.tx_bytes = 0;
        priv->port_stats.tx_chksum_offload = 0;
        priv->port_stats.queue_stopped = 0;
        priv->port_stats.wake_queue = 0;

        for (i = 0; i < priv->tx_ring_num; i++) {
                const struct mlx4_en_tx_ring *ring = priv->tx_ring[i];

                priv->pkstats.tx_packets += ring->packets;
                priv->pkstats.tx_bytes += ring->bytes;
                priv->port_stats.tx_chksum_offload += ring->tx_csum;
                priv->port_stats.queue_stopped     += ring->queue_stopped;
                priv->port_stats.wake_queue        += ring->wake_queue;
                priv->port_stats.oversized_packets += priv->tx_ring[i]->oversized_packets;
        }

        spin_unlock(&priv->stats_lock);

        memset(&tmp_vport_stats, 0, sizeof(tmp_vport_stats));

        counter_index = mlx4_get_default_counter_index(mdev->dev, port);
        err = mlx4_get_counter_stats(mdev->dev, counter_index,
                                     &tmp_vport_stats, 0);

        if (!err) {
                spin_lock(&priv->stats_lock);

                vf_stats->rx_bytes = be64_to_cpu(tmp_vport_stats.rx_bytes);
                vf_stats->rx_frames = be64_to_cpu(tmp_vport_stats.rx_frames);
                vf_stats->tx_bytes = be64_to_cpu(tmp_vport_stats.tx_bytes);
                vf_stats->tx_frames = be64_to_cpu(tmp_vport_stats.tx_frames);

                priv->pkstats.rx_packets = vf_stats->rx_frames;
                priv->pkstats.rx_bytes = vf_stats->rx_bytes;
                priv->pkstats.tx_packets = vf_stats->tx_frames;
                priv->pkstats.tx_bytes = vf_stats->tx_bytes;

                /* PF&VFs are not expected to report errors in ifconfig.
                 * rx_errors will be reprted in PF's ethtool statistics,
                 * see: mlx4_en_DUMP_ETH_STATS
                 */
                priv->pkstats.rx_errors = 0;
                priv->pkstats.rx_dropped = 0;
                priv->pkstats.tx_dropped = 0;
                priv->pkstats.rx_multicast_packets = 0;

                spin_unlock(&priv->stats_lock);
        }

        return err;
}