sched: Remove double_rq_lock() from __migrate_task()

[linux/fpc-iii.git] / drivers / net / ethernet / amd / xgbe / xgbe-drv.c

/*
 * AMD 10Gb Ethernet driver
 *
 * This file is available to you under your choice of the following two
 * licenses:
 *
 * License 1: GPLv2
 *
 * Copyright (c) 2014 Advanced Micro Devices, Inc.
 *
 * This file is free software; you may copy, redistribute and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or (at
 * your option) any later version.
 *
 * This file is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
 *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
 *     Inc. unless otherwise expressly agreed to in writing between Synopsys
 *     and you.
 *
 *     The Software IS NOT an item of Licensed Software or Licensed Product
 *     under any End User Software License Agreement or Agreement for Licensed
 *     Product with Synopsys or any supplement thereto.  Permission is hereby
 *     granted, free of charge, to any person obtaining a copy of this software
 *     annotated with this license and the Software, to deal in the Software
 *     without restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 *     of the Software, and to permit persons to whom the Software is furnished
 *     to do so, subject to the following conditions:
 *
 *     The above copyright notice and this permission notice shall be included
 *     in all copies or substantial portions of the Software.
 *
 *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
 *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
 *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 *     THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * License 2: Modified BSD
 *
 * Copyright (c) 2014 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * 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.
 *     * Neither the name of Advanced Micro Devices, Inc. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
 *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
 *     Inc. unless otherwise expressly agreed to in writing between Synopsys
 *     and you.
 *
 *     The Software IS NOT an item of Licensed Software or Licensed Product
 *     under any End User Software License Agreement or Agreement for Licensed
 *     Product with Synopsys or any supplement thereto.  Permission is hereby
 *     granted, free of charge, to any person obtaining a copy of this software
 *     annotated with this license and the Software, to deal in the Software
 *     without restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 *     of the Software, and to permit persons to whom the Software is furnished
 *     to do so, subject to the following conditions:
 *
 *     The above copyright notice and this permission notice shall be included
 *     in all copies or substantial portions of the Software.
 *
 *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
 *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
 *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 *     THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/spinlock.h>
#include <linux/tcp.h>
#include <linux/if_vlan.h>
#include <linux/phy.h>
#include <net/busy_poll.h>
#include <linux/clk.h>
#include <linux/if_ether.h>

#include "xgbe.h"
#include "xgbe-common.h"


static int xgbe_poll(struct napi_struct *, int);
static void xgbe_set_rx_mode(struct net_device *);

static inline unsigned int xgbe_tx_avail_desc(struct xgbe_ring *ring)
{
        return (ring->rdesc_count - (ring->cur - ring->dirty));
}

static int xgbe_calc_rx_buf_size(struct net_device *netdev, unsigned int mtu)
{
        unsigned int rx_buf_size;

        if (mtu > XGMAC_JUMBO_PACKET_MTU) {
                netdev_alert(netdev, "MTU exceeds maximum supported value\n");
                return -EINVAL;
        }

        rx_buf_size = mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
        if (rx_buf_size < RX_MIN_BUF_SIZE)
                rx_buf_size = RX_MIN_BUF_SIZE;
        rx_buf_size = (rx_buf_size + RX_BUF_ALIGN - 1) & ~(RX_BUF_ALIGN - 1);

        return rx_buf_size;
}

static void xgbe_enable_rx_tx_ints(struct xgbe_prv_data *pdata)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_channel *channel;
        unsigned int i;

        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++) {
                if (channel->tx_ring)
                        hw_if->enable_int(channel,
                                          XGMAC_INT_DMA_CH_SR_TI);
                if (channel->rx_ring)
                        hw_if->enable_int(channel,
                                          XGMAC_INT_DMA_CH_SR_RI);
        }
}

static void xgbe_disable_rx_tx_ints(struct xgbe_prv_data *pdata)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_channel *channel;
        unsigned int i;

        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++) {
                if (channel->tx_ring)
                        hw_if->disable_int(channel,
                                           XGMAC_INT_DMA_CH_SR_TI);
                if (channel->rx_ring)
                        hw_if->disable_int(channel,
                                           XGMAC_INT_DMA_CH_SR_RI);
        }
}

static irqreturn_t xgbe_isr(int irq, void *data)
{
        struct xgbe_prv_data *pdata = data;
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_channel *channel;
        unsigned int dma_isr, dma_ch_isr;
        unsigned int mac_isr;
        unsigned int i;

        /* The DMA interrupt status register also reports MAC and MTL
         * interrupts. So for polling mode, we just need to check for
         * this register to be non-zero
         */
        dma_isr = XGMAC_IOREAD(pdata, DMA_ISR);
        if (!dma_isr)
                goto isr_done;

        DBGPR("-->xgbe_isr\n");

        DBGPR("  DMA_ISR = %08x\n", dma_isr);
        DBGPR("  DMA_DS0 = %08x\n", XGMAC_IOREAD(pdata, DMA_DSR0));
        DBGPR("  DMA_DS1 = %08x\n", XGMAC_IOREAD(pdata, DMA_DSR1));

        for (i = 0; i < pdata->channel_count; i++) {
                if (!(dma_isr & (1 << i)))
                        continue;

                channel = pdata->channel + i;

                dma_ch_isr = XGMAC_DMA_IOREAD(channel, DMA_CH_SR);
                DBGPR("  DMA_CH%u_ISR = %08x\n", i, dma_ch_isr);

                if (XGMAC_GET_BITS(dma_ch_isr, DMA_CH_SR, TI) ||
                    XGMAC_GET_BITS(dma_ch_isr, DMA_CH_SR, RI)) {
                        if (napi_schedule_prep(&pdata->napi)) {
                                /* Disable Tx and Rx interrupts */
                                xgbe_disable_rx_tx_ints(pdata);

                                /* Turn on polling */
                                __napi_schedule(&pdata->napi);
                        }
                }

                /* Restart the device on a Fatal Bus Error */
                if (XGMAC_GET_BITS(dma_ch_isr, DMA_CH_SR, FBE))
                        schedule_work(&pdata->restart_work);

                /* Clear all interrupt signals */
                XGMAC_DMA_IOWRITE(channel, DMA_CH_SR, dma_ch_isr);
        }

        if (XGMAC_GET_BITS(dma_isr, DMA_ISR, MACIS)) {
                mac_isr = XGMAC_IOREAD(pdata, MAC_ISR);

                if (XGMAC_GET_BITS(mac_isr, MAC_ISR, MMCTXIS))
                        hw_if->tx_mmc_int(pdata);

                if (XGMAC_GET_BITS(mac_isr, MAC_ISR, MMCRXIS))
                        hw_if->rx_mmc_int(pdata);
        }

        DBGPR("  DMA_ISR = %08x\n", XGMAC_IOREAD(pdata, DMA_ISR));

        DBGPR("<--xgbe_isr\n");

isr_done:
        return IRQ_HANDLED;
}

static enum hrtimer_restart xgbe_tx_timer(struct hrtimer *timer)
{
        struct xgbe_channel *channel = container_of(timer,
                                                    struct xgbe_channel,
                                                    tx_timer);
        struct xgbe_ring *ring = channel->tx_ring;
        struct xgbe_prv_data *pdata = channel->pdata;
        unsigned long flags;

        DBGPR("-->xgbe_tx_timer\n");

        spin_lock_irqsave(&ring->lock, flags);

        if (napi_schedule_prep(&pdata->napi)) {
                /* Disable Tx and Rx interrupts */
                xgbe_disable_rx_tx_ints(pdata);

                /* Turn on polling */
                __napi_schedule(&pdata->napi);
        }

        channel->tx_timer_active = 0;

        spin_unlock_irqrestore(&ring->lock, flags);

        DBGPR("<--xgbe_tx_timer\n");

        return HRTIMER_NORESTART;
}

static void xgbe_init_tx_timers(struct xgbe_prv_data *pdata)
{
        struct xgbe_channel *channel;
        unsigned int i;

        DBGPR("-->xgbe_init_tx_timers\n");

        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++) {
                if (!channel->tx_ring)
                        break;

                DBGPR("  %s adding tx timer\n", channel->name);
                hrtimer_init(&channel->tx_timer, CLOCK_MONOTONIC,
                             HRTIMER_MODE_REL);
                channel->tx_timer.function = xgbe_tx_timer;
        }

        DBGPR("<--xgbe_init_tx_timers\n");
}

static void xgbe_stop_tx_timers(struct xgbe_prv_data *pdata)
{
        struct xgbe_channel *channel;
        unsigned int i;

        DBGPR("-->xgbe_stop_tx_timers\n");

        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++) {
                if (!channel->tx_ring)
                        break;

                DBGPR("  %s deleting tx timer\n", channel->name);
                channel->tx_timer_active = 0;
                hrtimer_cancel(&channel->tx_timer);
        }

        DBGPR("<--xgbe_stop_tx_timers\n");
}

void xgbe_get_all_hw_features(struct xgbe_prv_data *pdata)
{
        unsigned int mac_hfr0, mac_hfr1, mac_hfr2;
        struct xgbe_hw_features *hw_feat = &pdata->hw_feat;

        DBGPR("-->xgbe_get_all_hw_features\n");

        mac_hfr0 = XGMAC_IOREAD(pdata, MAC_HWF0R);
        mac_hfr1 = XGMAC_IOREAD(pdata, MAC_HWF1R);
        mac_hfr2 = XGMAC_IOREAD(pdata, MAC_HWF2R);

        memset(hw_feat, 0, sizeof(*hw_feat));

        /* Hardware feature register 0 */
        hw_feat->gmii        = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, GMIISEL);
        hw_feat->vlhash      = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, VLHASH);
        hw_feat->sma         = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, SMASEL);
        hw_feat->rwk         = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, RWKSEL);
        hw_feat->mgk         = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, MGKSEL);
        hw_feat->mmc         = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, MMCSEL);
        hw_feat->aoe         = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, ARPOFFSEL);
        hw_feat->ts          = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, TSSEL);
        hw_feat->eee         = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, EEESEL);
        hw_feat->tx_coe      = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, TXCOESEL);
        hw_feat->rx_coe      = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, RXCOESEL);
        hw_feat->addn_mac    = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R,
                                              ADDMACADRSEL);
        hw_feat->ts_src      = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, TSSTSSEL);
        hw_feat->sa_vlan_ins = XGMAC_GET_BITS(mac_hfr0, MAC_HWF0R, SAVLANINS);

        /* Hardware feature register 1 */
        hw_feat->rx_fifo_size  = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R,
                                                RXFIFOSIZE);
        hw_feat->tx_fifo_size  = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R,
                                                TXFIFOSIZE);
        hw_feat->dcb           = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R, DCBEN);
        hw_feat->sph           = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R, SPHEN);
        hw_feat->tso           = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R, TSOEN);
        hw_feat->dma_debug     = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R, DBGMEMA);
        hw_feat->hash_table_size = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R,
                                                  HASHTBLSZ);
        hw_feat->l3l4_filter_num = XGMAC_GET_BITS(mac_hfr1, MAC_HWF1R,
                                                  L3L4FNUM);

        /* Hardware feature register 2 */
        hw_feat->rx_q_cnt     = XGMAC_GET_BITS(mac_hfr2, MAC_HWF2R, RXQCNT);
        hw_feat->tx_q_cnt     = XGMAC_GET_BITS(mac_hfr2, MAC_HWF2R, TXQCNT);
        hw_feat->rx_ch_cnt    = XGMAC_GET_BITS(mac_hfr2, MAC_HWF2R, RXCHCNT);
        hw_feat->tx_ch_cnt    = XGMAC_GET_BITS(mac_hfr2, MAC_HWF2R, TXCHCNT);
        hw_feat->pps_out_num  = XGMAC_GET_BITS(mac_hfr2, MAC_HWF2R, PPSOUTNUM);
        hw_feat->aux_snap_num = XGMAC_GET_BITS(mac_hfr2, MAC_HWF2R, AUXSNAPNUM);

        /* The Queue and Channel counts are zero based so increment them
         * to get the actual number
         */
        hw_feat->rx_q_cnt++;
        hw_feat->tx_q_cnt++;
        hw_feat->rx_ch_cnt++;
        hw_feat->tx_ch_cnt++;

        DBGPR("<--xgbe_get_all_hw_features\n");
}

static void xgbe_napi_enable(struct xgbe_prv_data *pdata, unsigned int add)
{
        if (add)
                netif_napi_add(pdata->netdev, &pdata->napi, xgbe_poll,
                               NAPI_POLL_WEIGHT);
        napi_enable(&pdata->napi);
}

static void xgbe_napi_disable(struct xgbe_prv_data *pdata)
{
        napi_disable(&pdata->napi);
}

void xgbe_init_tx_coalesce(struct xgbe_prv_data *pdata)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;

        DBGPR("-->xgbe_init_tx_coalesce\n");

        pdata->tx_usecs = XGMAC_INIT_DMA_TX_USECS;
        pdata->tx_frames = XGMAC_INIT_DMA_TX_FRAMES;

        hw_if->config_tx_coalesce(pdata);

        DBGPR("<--xgbe_init_tx_coalesce\n");
}

void xgbe_init_rx_coalesce(struct xgbe_prv_data *pdata)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;

        DBGPR("-->xgbe_init_rx_coalesce\n");

        pdata->rx_riwt = hw_if->usec_to_riwt(pdata, XGMAC_INIT_DMA_RX_USECS);
        pdata->rx_frames = XGMAC_INIT_DMA_RX_FRAMES;

        hw_if->config_rx_coalesce(pdata);

        DBGPR("<--xgbe_init_rx_coalesce\n");
}

static void xgbe_free_tx_skbuff(struct xgbe_prv_data *pdata)
{
        struct xgbe_desc_if *desc_if = &pdata->desc_if;
        struct xgbe_channel *channel;
        struct xgbe_ring *ring;
        struct xgbe_ring_data *rdata;
        unsigned int i, j;

        DBGPR("-->xgbe_free_tx_skbuff\n");

        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++) {
                ring = channel->tx_ring;
                if (!ring)
                        break;

                for (j = 0; j < ring->rdesc_count; j++) {
                        rdata = GET_DESC_DATA(ring, j);
                        desc_if->unmap_skb(pdata, rdata);
                }
        }

        DBGPR("<--xgbe_free_tx_skbuff\n");
}

static void xgbe_free_rx_skbuff(struct xgbe_prv_data *pdata)
{
        struct xgbe_desc_if *desc_if = &pdata->desc_if;
        struct xgbe_channel *channel;
        struct xgbe_ring *ring;
        struct xgbe_ring_data *rdata;
        unsigned int i, j;

        DBGPR("-->xgbe_free_rx_skbuff\n");

        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++) {
                ring = channel->rx_ring;
                if (!ring)
                        break;

                for (j = 0; j < ring->rdesc_count; j++) {
                        rdata = GET_DESC_DATA(ring, j);
                        desc_if->unmap_skb(pdata, rdata);
                }
        }

        DBGPR("<--xgbe_free_rx_skbuff\n");
}

int xgbe_powerdown(struct net_device *netdev, unsigned int caller)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        unsigned long flags;

        DBGPR("-->xgbe_powerdown\n");

        if (!netif_running(netdev) ||
            (caller == XGMAC_IOCTL_CONTEXT && pdata->power_down)) {
                netdev_alert(netdev, "Device is already powered down\n");
                DBGPR("<--xgbe_powerdown\n");
                return -EINVAL;
        }

        phy_stop(pdata->phydev);

        spin_lock_irqsave(&pdata->lock, flags);

        if (caller == XGMAC_DRIVER_CONTEXT)
                netif_device_detach(netdev);

        netif_tx_stop_all_queues(netdev);
        xgbe_napi_disable(pdata);

        /* Powerdown Tx/Rx */
        hw_if->powerdown_tx(pdata);
        hw_if->powerdown_rx(pdata);

        pdata->power_down = 1;

        spin_unlock_irqrestore(&pdata->lock, flags);

        DBGPR("<--xgbe_powerdown\n");

        return 0;
}

int xgbe_powerup(struct net_device *netdev, unsigned int caller)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        unsigned long flags;

        DBGPR("-->xgbe_powerup\n");

        if (!netif_running(netdev) ||
            (caller == XGMAC_IOCTL_CONTEXT && !pdata->power_down)) {
                netdev_alert(netdev, "Device is already powered up\n");
                DBGPR("<--xgbe_powerup\n");
                return -EINVAL;
        }

        spin_lock_irqsave(&pdata->lock, flags);

        pdata->power_down = 0;

        phy_start(pdata->phydev);

        /* Enable Tx/Rx */
        hw_if->powerup_tx(pdata);
        hw_if->powerup_rx(pdata);

        if (caller == XGMAC_DRIVER_CONTEXT)
                netif_device_attach(netdev);

        xgbe_napi_enable(pdata, 0);
        netif_tx_start_all_queues(netdev);

        spin_unlock_irqrestore(&pdata->lock, flags);

        DBGPR("<--xgbe_powerup\n");

        return 0;
}

static int xgbe_start(struct xgbe_prv_data *pdata)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct net_device *netdev = pdata->netdev;

        DBGPR("-->xgbe_start\n");

        xgbe_set_rx_mode(netdev);

        hw_if->init(pdata);

        phy_start(pdata->phydev);

        hw_if->enable_tx(pdata);
        hw_if->enable_rx(pdata);

        xgbe_init_tx_timers(pdata);

        xgbe_napi_enable(pdata, 1);
        netif_tx_start_all_queues(netdev);

        DBGPR("<--xgbe_start\n");

        return 0;
}

static void xgbe_stop(struct xgbe_prv_data *pdata)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct net_device *netdev = pdata->netdev;

        DBGPR("-->xgbe_stop\n");

        phy_stop(pdata->phydev);

        netif_tx_stop_all_queues(netdev);
        xgbe_napi_disable(pdata);

        xgbe_stop_tx_timers(pdata);

        hw_if->disable_tx(pdata);
        hw_if->disable_rx(pdata);

        DBGPR("<--xgbe_stop\n");
}

static void xgbe_restart_dev(struct xgbe_prv_data *pdata, unsigned int reset)
{
        struct xgbe_hw_if *hw_if = &pdata->hw_if;

        DBGPR("-->xgbe_restart_dev\n");

        /* If not running, "restart" will happen on open */
        if (!netif_running(pdata->netdev))
                return;

        xgbe_stop(pdata);
        synchronize_irq(pdata->irq_number);

        xgbe_free_tx_skbuff(pdata);
        xgbe_free_rx_skbuff(pdata);

        /* Issue software reset to device if requested */
        if (reset)
                hw_if->exit(pdata);

        xgbe_start(pdata);

        DBGPR("<--xgbe_restart_dev\n");
}

static void xgbe_restart(struct work_struct *work)
{
        struct xgbe_prv_data *pdata = container_of(work,
                                                   struct xgbe_prv_data,
                                                   restart_work);

        rtnl_lock();

        xgbe_restart_dev(pdata, 1);

        rtnl_unlock();
}

static void xgbe_prep_vlan(struct sk_buff *skb, struct xgbe_packet_data *packet)
{
        if (vlan_tx_tag_present(skb))
                packet->vlan_ctag = vlan_tx_tag_get(skb);
}

static int xgbe_prep_tso(struct sk_buff *skb, struct xgbe_packet_data *packet)
{
        int ret;

        if (!XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
                            TSO_ENABLE))
                return 0;

        ret = skb_cow_head(skb, 0);
        if (ret)
                return ret;

        packet->header_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
        packet->tcp_header_len = tcp_hdrlen(skb);
        packet->tcp_payload_len = skb->len - packet->header_len;
        packet->mss = skb_shinfo(skb)->gso_size;
        DBGPR("  packet->header_len=%u\n", packet->header_len);
        DBGPR("  packet->tcp_header_len=%u, packet->tcp_payload_len=%u\n",
              packet->tcp_header_len, packet->tcp_payload_len);
        DBGPR("  packet->mss=%u\n", packet->mss);

        return 0;
}

static int xgbe_is_tso(struct sk_buff *skb)
{
        if (skb->ip_summed != CHECKSUM_PARTIAL)
                return 0;

        if (!skb_is_gso(skb))
                return 0;

        DBGPR("  TSO packet to be processed\n");

        return 1;
}

static void xgbe_packet_info(struct xgbe_ring *ring, struct sk_buff *skb,
                             struct xgbe_packet_data *packet)
{
        struct skb_frag_struct *frag;
        unsigned int context_desc;
        unsigned int len;
        unsigned int i;

        context_desc = 0;
        packet->rdesc_count = 0;

        if (xgbe_is_tso(skb)) {
                /* TSO requires an extra desriptor if mss is different */
                if (skb_shinfo(skb)->gso_size != ring->tx.cur_mss) {
                        context_desc = 1;
                        packet->rdesc_count++;
                }

                /* TSO requires an extra desriptor for TSO header */
                packet->rdesc_count++;

                XGMAC_SET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
                               TSO_ENABLE, 1);
                XGMAC_SET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
                               CSUM_ENABLE, 1);
        } else if (skb->ip_summed == CHECKSUM_PARTIAL)
                XGMAC_SET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
                               CSUM_ENABLE, 1);

        if (vlan_tx_tag_present(skb)) {
                /* VLAN requires an extra descriptor if tag is different */
                if (vlan_tx_tag_get(skb) != ring->tx.cur_vlan_ctag)
                        /* We can share with the TSO context descriptor */
                        if (!context_desc) {
                                context_desc = 1;
                                packet->rdesc_count++;
                        }

                XGMAC_SET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
                               VLAN_CTAG, 1);
        }

        for (len = skb_headlen(skb); len;) {
                packet->rdesc_count++;
                len -= min_t(unsigned int, len, TX_MAX_BUF_SIZE);
        }

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                frag = &skb_shinfo(skb)->frags[i];
                for (len = skb_frag_size(frag); len; ) {
                        packet->rdesc_count++;
                        len -= min_t(unsigned int, len, TX_MAX_BUF_SIZE);
                }
        }
}

static int xgbe_open(struct net_device *netdev)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_desc_if *desc_if = &pdata->desc_if;
        int ret;

        DBGPR("-->xgbe_open\n");

        /* Enable the clock */
        ret = clk_prepare_enable(pdata->sysclock);
        if (ret) {
                netdev_alert(netdev, "clk_prepare_enable failed\n");
                return ret;
        }

        /* Calculate the Rx buffer size before allocating rings */
        ret = xgbe_calc_rx_buf_size(netdev, netdev->mtu);
        if (ret < 0)
                goto err_clk;
        pdata->rx_buf_size = ret;

        /* Allocate the ring descriptors and buffers */
        ret = desc_if->alloc_ring_resources(pdata);
        if (ret)
                goto err_clk;

        /* Initialize the device restart work struct */
        INIT_WORK(&pdata->restart_work, xgbe_restart);

        /* Request interrupts */
        ret = devm_request_irq(pdata->dev, netdev->irq, xgbe_isr, 0,
                               netdev->name, pdata);
        if (ret) {
                netdev_alert(netdev, "error requesting irq %d\n",
                             pdata->irq_number);
                goto err_irq;
        }
        pdata->irq_number = netdev->irq;

        ret = xgbe_start(pdata);
        if (ret)
                goto err_start;

        DBGPR("<--xgbe_open\n");

        return 0;

err_start:
        hw_if->exit(pdata);

        devm_free_irq(pdata->dev, pdata->irq_number, pdata);
        pdata->irq_number = 0;

err_irq:
        desc_if->free_ring_resources(pdata);

err_clk:
        clk_disable_unprepare(pdata->sysclock);

        return ret;
}

static int xgbe_close(struct net_device *netdev)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_desc_if *desc_if = &pdata->desc_if;

        DBGPR("-->xgbe_close\n");

        /* Stop the device */
        xgbe_stop(pdata);

        /* Issue software reset to device */
        hw_if->exit(pdata);

        /* Free all the ring data */
        desc_if->free_ring_resources(pdata);

        /* Release the interrupt */
        if (pdata->irq_number != 0) {
                devm_free_irq(pdata->dev, pdata->irq_number, pdata);
                pdata->irq_number = 0;
        }

        /* Disable the clock */
        clk_disable_unprepare(pdata->sysclock);

        DBGPR("<--xgbe_close\n");

        return 0;
}

static int xgbe_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_desc_if *desc_if = &pdata->desc_if;
        struct xgbe_channel *channel;
        struct xgbe_ring *ring;
        struct xgbe_packet_data *packet;
        unsigned long flags;
        int ret;

        DBGPR("-->xgbe_xmit: skb->len = %d\n", skb->len);

        channel = pdata->channel + skb->queue_mapping;
        ring = channel->tx_ring;
        packet = &ring->packet_data;

        ret = NETDEV_TX_OK;

        spin_lock_irqsave(&ring->lock, flags);

        if (skb->len == 0) {
                netdev_err(netdev, "empty skb received from stack\n");
                dev_kfree_skb_any(skb);
                goto tx_netdev_return;
        }

        /* Calculate preliminary packet info */
        memset(packet, 0, sizeof(*packet));
        xgbe_packet_info(ring, skb, packet);

        /* Check that there are enough descriptors available */
        if (packet->rdesc_count > xgbe_tx_avail_desc(ring)) {
                DBGPR("  Tx queue stopped, not enough descriptors available\n");
                netif_stop_subqueue(netdev, channel->queue_index);
                ring->tx.queue_stopped = 1;
                ret = NETDEV_TX_BUSY;
                goto tx_netdev_return;
        }

        ret = xgbe_prep_tso(skb, packet);
        if (ret) {
                netdev_err(netdev, "error processing TSO packet\n");
                dev_kfree_skb_any(skb);
                goto tx_netdev_return;
        }
        xgbe_prep_vlan(skb, packet);

        if (!desc_if->map_tx_skb(channel, skb)) {
                dev_kfree_skb_any(skb);
                goto tx_netdev_return;
        }

        /* Configure required descriptor fields for transmission */
        hw_if->pre_xmit(channel);

#ifdef XGMAC_ENABLE_TX_PKT_DUMP
        xgbe_print_pkt(netdev, skb, true);
#endif

tx_netdev_return:
        spin_unlock_irqrestore(&ring->lock, flags);

        DBGPR("<--xgbe_xmit\n");

        return ret;
}

static void xgbe_set_rx_mode(struct net_device *netdev)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        unsigned int pr_mode, am_mode;

        DBGPR("-->xgbe_set_rx_mode\n");

        pr_mode = ((netdev->flags & IFF_PROMISC) != 0);
        am_mode = ((netdev->flags & IFF_ALLMULTI) != 0);

        if (netdev_uc_count(netdev) > pdata->hw_feat.addn_mac)
                pr_mode = 1;
        if (netdev_mc_count(netdev) > pdata->hw_feat.addn_mac)
                am_mode = 1;
        if ((netdev_uc_count(netdev) + netdev_mc_count(netdev)) >
             pdata->hw_feat.addn_mac)
                pr_mode = 1;

        hw_if->set_promiscuous_mode(pdata, pr_mode);
        hw_if->set_all_multicast_mode(pdata, am_mode);
        if (!pr_mode)
                hw_if->set_addn_mac_addrs(pdata, am_mode);

        DBGPR("<--xgbe_set_rx_mode\n");
}

static int xgbe_set_mac_address(struct net_device *netdev, void *addr)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct sockaddr *saddr = addr;

        DBGPR("-->xgbe_set_mac_address\n");

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

        memcpy(netdev->dev_addr, saddr->sa_data, netdev->addr_len);

        hw_if->set_mac_address(pdata, netdev->dev_addr);

        DBGPR("<--xgbe_set_mac_address\n");

        return 0;
}

static int xgbe_change_mtu(struct net_device *netdev, int mtu)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        int ret;

        DBGPR("-->xgbe_change_mtu\n");

        ret = xgbe_calc_rx_buf_size(netdev, mtu);
        if (ret < 0)
                return ret;

        pdata->rx_buf_size = ret;
        netdev->mtu = mtu;

        xgbe_restart_dev(pdata, 0);

        DBGPR("<--xgbe_change_mtu\n");

        return 0;
}

static struct rtnl_link_stats64 *xgbe_get_stats64(struct net_device *netdev,
                                                  struct rtnl_link_stats64 *s)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_mmc_stats *pstats = &pdata->mmc_stats;

        DBGPR("-->%s\n", __func__);

        pdata->hw_if.read_mmc_stats(pdata);

        s->rx_packets = pstats->rxframecount_gb;
        s->rx_bytes = pstats->rxoctetcount_gb;
        s->rx_errors = pstats->rxframecount_gb -
                       pstats->rxbroadcastframes_g -
                       pstats->rxmulticastframes_g -
                       pstats->rxunicastframes_g;
        s->multicast = pstats->rxmulticastframes_g;
        s->rx_length_errors = pstats->rxlengtherror;
        s->rx_crc_errors = pstats->rxcrcerror;
        s->rx_fifo_errors = pstats->rxfifooverflow;

        s->tx_packets = pstats->txframecount_gb;
        s->tx_bytes = pstats->txoctetcount_gb;
        s->tx_errors = pstats->txframecount_gb - pstats->txframecount_g;
        s->tx_dropped = netdev->stats.tx_dropped;

        DBGPR("<--%s\n", __func__);

        return s;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void xgbe_poll_controller(struct net_device *netdev)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);

        DBGPR("-->xgbe_poll_controller\n");

        disable_irq(pdata->irq_number);

        xgbe_isr(pdata->irq_number, pdata);

        enable_irq(pdata->irq_number);

        DBGPR("<--xgbe_poll_controller\n");
}
#endif /* End CONFIG_NET_POLL_CONTROLLER */

static int xgbe_set_features(struct net_device *netdev,
                             netdev_features_t features)
{
        struct xgbe_prv_data *pdata = netdev_priv(netdev);
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        unsigned int rxcsum_enabled, rxvlan_enabled;

        rxcsum_enabled = !!(pdata->netdev_features & NETIF_F_RXCSUM);
        rxvlan_enabled = !!(pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_RX);

        if ((features & NETIF_F_RXCSUM) && !rxcsum_enabled) {
                hw_if->enable_rx_csum(pdata);
                netdev_alert(netdev, "state change - rxcsum enabled\n");
        } else if (!(features & NETIF_F_RXCSUM) && rxcsum_enabled) {
                hw_if->disable_rx_csum(pdata);
                netdev_alert(netdev, "state change - rxcsum disabled\n");
        }

        if ((features & NETIF_F_HW_VLAN_CTAG_RX) && !rxvlan_enabled) {
                hw_if->enable_rx_vlan_stripping(pdata);
                netdev_alert(netdev, "state change - rxvlan enabled\n");
        } else if (!(features & NETIF_F_HW_VLAN_CTAG_RX) && rxvlan_enabled) {
                hw_if->disable_rx_vlan_stripping(pdata);
                netdev_alert(netdev, "state change - rxvlan disabled\n");
        }

        pdata->netdev_features = features;

        DBGPR("<--xgbe_set_features\n");

        return 0;
}

static const struct net_device_ops xgbe_netdev_ops = {
        .ndo_open               = xgbe_open,
        .ndo_stop               = xgbe_close,
        .ndo_start_xmit         = xgbe_xmit,
        .ndo_set_rx_mode        = xgbe_set_rx_mode,
        .ndo_set_mac_address    = xgbe_set_mac_address,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_change_mtu         = xgbe_change_mtu,
        .ndo_get_stats64        = xgbe_get_stats64,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = xgbe_poll_controller,
#endif
        .ndo_set_features       = xgbe_set_features,
};

struct net_device_ops *xgbe_get_netdev_ops(void)
{
        return (struct net_device_ops *)&xgbe_netdev_ops;
}

static int xgbe_tx_poll(struct xgbe_channel *channel)
{
        struct xgbe_prv_data *pdata = channel->pdata;
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_desc_if *desc_if = &pdata->desc_if;
        struct xgbe_ring *ring = channel->tx_ring;
        struct xgbe_ring_data *rdata;
        struct xgbe_ring_desc *rdesc;
        struct net_device *netdev = pdata->netdev;
        unsigned long flags;
        int processed = 0;

        DBGPR("-->xgbe_tx_poll\n");

        /* Nothing to do if there isn't a Tx ring for this channel */
        if (!ring)
                return 0;

        spin_lock_irqsave(&ring->lock, flags);

        while ((processed < TX_DESC_MAX_PROC) && (ring->dirty < ring->cur)) {
                rdata = GET_DESC_DATA(ring, ring->dirty);
                rdesc = rdata->rdesc;

                if (!hw_if->tx_complete(rdesc))
                        break;

#ifdef XGMAC_ENABLE_TX_DESC_DUMP
                xgbe_dump_tx_desc(ring, ring->dirty, 1, 0);
#endif

                /* Free the SKB and reset the descriptor for re-use */
                desc_if->unmap_skb(pdata, rdata);
                hw_if->tx_desc_reset(rdata);

                processed++;
                ring->dirty++;
        }

        if ((ring->tx.queue_stopped == 1) &&
            (xgbe_tx_avail_desc(ring) > TX_DESC_MIN_FREE)) {
                ring->tx.queue_stopped = 0;
                netif_wake_subqueue(netdev, channel->queue_index);
        }

        DBGPR("<--xgbe_tx_poll: processed=%d\n", processed);

        spin_unlock_irqrestore(&ring->lock, flags);

        return processed;
}

static int xgbe_rx_poll(struct xgbe_channel *channel, int budget)
{
        struct xgbe_prv_data *pdata = channel->pdata;
        struct xgbe_hw_if *hw_if = &pdata->hw_if;
        struct xgbe_desc_if *desc_if = &pdata->desc_if;
        struct xgbe_ring *ring = channel->rx_ring;
        struct xgbe_ring_data *rdata;
        struct xgbe_packet_data *packet;
        struct net_device *netdev = pdata->netdev;
        struct sk_buff *skb;
        unsigned int incomplete, error;
        unsigned int cur_len, put_len, max_len;
        int received = 0;

        DBGPR("-->xgbe_rx_poll: budget=%d\n", budget);

        /* Nothing to do if there isn't a Rx ring for this channel */
        if (!ring)
                return 0;

        packet = &ring->packet_data;
        while (received < budget) {
                DBGPR("  cur = %d\n", ring->cur);

                /* Clear the packet data information */
                memset(packet, 0, sizeof(*packet));
                skb = NULL;
                error = 0;
                cur_len = 0;

read_again:
                rdata = GET_DESC_DATA(ring, ring->cur);

                if (hw_if->dev_read(channel))
                        break;

                received++;
                ring->cur++;
                ring->dirty++;

                dma_unmap_single(pdata->dev, rdata->skb_dma,
                                 rdata->skb_dma_len, DMA_FROM_DEVICE);
                rdata->skb_dma = 0;

                incomplete = XGMAC_GET_BITS(packet->attributes,
                                            RX_PACKET_ATTRIBUTES,
                                            INCOMPLETE);

                /* Earlier error, just drain the remaining data */
                if (incomplete && error)
                        goto read_again;

                if (error || packet->errors) {
                        if (packet->errors)
                                DBGPR("Error in received packet\n");
                        dev_kfree_skb(skb);
                        continue;
                }

                put_len = rdata->len - cur_len;
                if (skb) {
                        if (pskb_expand_head(skb, 0, put_len, GFP_ATOMIC)) {
                                DBGPR("pskb_expand_head error\n");
                                if (incomplete) {
                                        error = 1;
                                        goto read_again;
                                }

                                dev_kfree_skb(skb);
                                continue;
                        }
                        memcpy(skb_tail_pointer(skb), rdata->skb->data,
                               put_len);
                } else {
                        skb = rdata->skb;
                        rdata->skb = NULL;
                }
                skb_put(skb, put_len);
                cur_len += put_len;

                if (incomplete)
                        goto read_again;

                /* Be sure we don't exceed the configured MTU */
                max_len = netdev->mtu + ETH_HLEN;
                if (!(netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
                    (skb->protocol == htons(ETH_P_8021Q)))
                        max_len += VLAN_HLEN;

                if (skb->len > max_len) {
                        DBGPR("packet length exceeds configured MTU\n");
                        dev_kfree_skb(skb);
                        continue;
                }

#ifdef XGMAC_ENABLE_RX_PKT_DUMP
                xgbe_print_pkt(netdev, skb, false);
#endif

                skb_checksum_none_assert(skb);
                if (XGMAC_GET_BITS(packet->attributes,
                                   RX_PACKET_ATTRIBUTES, CSUM_DONE))
                        skb->ip_summed = CHECKSUM_UNNECESSARY;

                if (XGMAC_GET_BITS(packet->attributes,
                                   RX_PACKET_ATTRIBUTES, VLAN_CTAG))
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                               packet->vlan_ctag);

                skb->dev = netdev;
                skb->protocol = eth_type_trans(skb, netdev);
                skb_record_rx_queue(skb, channel->queue_index);
                skb_mark_napi_id(skb, &pdata->napi);

                netdev->last_rx = jiffies;
                napi_gro_receive(&pdata->napi, skb);
        }

        if (received) {
                desc_if->realloc_skb(channel);

                /* Update the Rx Tail Pointer Register with address of
                 * the last cleaned entry */
                rdata = GET_DESC_DATA(ring, ring->rx.realloc_index - 1);
                XGMAC_DMA_IOWRITE(channel, DMA_CH_RDTR_LO,
                                  lower_32_bits(rdata->rdesc_dma));
        }

        DBGPR("<--xgbe_rx_poll: received = %d\n", received);

        return received;
}

static int xgbe_poll(struct napi_struct *napi, int budget)
{
        struct xgbe_prv_data *pdata = container_of(napi, struct xgbe_prv_data,
                                                   napi);
        struct xgbe_channel *channel;
        int processed;
        unsigned int i;

        DBGPR("-->xgbe_poll: budget=%d\n", budget);

        /* Cleanup Tx ring first */
        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++)
                xgbe_tx_poll(channel);

        /* Process Rx ring next */
        processed = 0;
        channel = pdata->channel;
        for (i = 0; i < pdata->channel_count; i++, channel++)
                processed += xgbe_rx_poll(channel, budget - processed);

        /* If we processed everything, we are done */
        if (processed < budget) {
                /* Turn off polling */
                napi_complete(napi);

                /* Enable Tx and Rx interrupts */
                xgbe_enable_rx_tx_ints(pdata);
        }

        DBGPR("<--xgbe_poll: received = %d\n", processed);

        return processed;
}

void xgbe_dump_tx_desc(struct xgbe_ring *ring, unsigned int idx,
                       unsigned int count, unsigned int flag)
{
        struct xgbe_ring_data *rdata;
        struct xgbe_ring_desc *rdesc;

        while (count--) {
                rdata = GET_DESC_DATA(ring, idx);
                rdesc = rdata->rdesc;
                DBGPR("TX_NORMAL_DESC[%d %s] = %08x:%08x:%08x:%08x\n", idx,
                      (flag == 1) ? "QUEUED FOR TX" : "TX BY DEVICE",
                      le32_to_cpu(rdesc->desc0), le32_to_cpu(rdesc->desc1),
                      le32_to_cpu(rdesc->desc2), le32_to_cpu(rdesc->desc3));
                idx++;
        }
}

void xgbe_dump_rx_desc(struct xgbe_ring *ring, struct xgbe_ring_desc *desc,
                       unsigned int idx)
{
        DBGPR("RX_NORMAL_DESC[%d RX BY DEVICE] = %08x:%08x:%08x:%08x\n", idx,
              le32_to_cpu(desc->desc0), le32_to_cpu(desc->desc1),
              le32_to_cpu(desc->desc2), le32_to_cpu(desc->desc3));
}

void xgbe_print_pkt(struct net_device *netdev, struct sk_buff *skb, bool tx_rx)
{
        struct ethhdr *eth = (struct ethhdr *)skb->data;
        unsigned char *buf = skb->data;
        unsigned char buffer[128];
        unsigned int i, j;

        netdev_alert(netdev, "\n************** SKB dump ****************\n");

        netdev_alert(netdev, "%s packet of %d bytes\n",
                     (tx_rx ? "TX" : "RX"), skb->len);

        netdev_alert(netdev, "Dst MAC addr: %pM\n", eth->h_dest);
        netdev_alert(netdev, "Src MAC addr: %pM\n", eth->h_source);
        netdev_alert(netdev, "Protocol: 0x%04hx\n", ntohs(eth->h_proto));

        for (i = 0, j = 0; i < skb->len;) {
                j += snprintf(buffer + j, sizeof(buffer) - j, "%02hhx",
                              buf[i++]);

                if ((i % 32) == 0) {
                        netdev_alert(netdev, "  0x%04x: %s\n", i - 32, buffer);
                        j = 0;
                } else if ((i % 16) == 0) {
                        buffer[j++] = ' ';
                        buffer[j++] = ' ';
                } else if ((i % 4) == 0) {
                        buffer[j++] = ' ';
                }
        }
        if (i % 32)
                netdev_alert(netdev, "  0x%04x: %s\n", i - (i % 32), buffer);

        netdev_alert(netdev, "\n************** SKB dump ****************\n");
}