/* Copyright 2014-2016 Freescale Semiconductor Inc.
 * Copyright 2016-2017 NXP
 *
 * 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 Freescale Semiconductor nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/etherdevice.h>
#include <linux/of_net.h>
#include <linux/interrupt.h>
#include <linux/msi.h>
#include <linux/kthread.h>
#include <linux/iommu.h>

#include "../../fsl-mc/include/mc.h"
#include "dpaa2-eth.h"

/* CREATE_TRACE_POINTS only needs to be defined once. Other dpa files
 * using trace events only need to #include <trace/events/sched.h>
 */
#define CREATE_TRACE_POINTS
#include "dpaa2-eth-trace.h"

MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Freescale Semiconductor, Inc");
MODULE_DESCRIPTION("Freescale DPAA2 Ethernet Driver");

const char dpaa2_eth_drv_version[] = "0.1";

static void *dpaa2_iova_to_virt(struct iommu_domain *domain,
                                dma_addr_t iova_addr)
{
        phys_addr_t phys_addr;

        phys_addr = domain ? iommu_iova_to_phys(domain, iova_addr) : iova_addr;

        return phys_to_virt(phys_addr);
}

static void validate_rx_csum(struct dpaa2_eth_priv *priv,
                             u32 fd_status,
                             struct sk_buff *skb)
{
        skb_checksum_none_assert(skb);

        /* HW checksum validation is disabled, nothing to do here */
        if (!(priv->net_dev->features & NETIF_F_RXCSUM))
                return;

        /* Read checksum validation bits */
        if (!((fd_status & DPAA2_FAS_L3CV) &&
              (fd_status & DPAA2_FAS_L4CV)))
                return;

        /* Inform the stack there's no need to compute L3/L4 csum anymore */
        skb->ip_summed = CHECKSUM_UNNECESSARY;
}

/* Free a received FD.
 * Not to be used for Tx conf FDs or on any other paths.
 */
static void free_rx_fd(struct dpaa2_eth_priv *priv,
                       const struct dpaa2_fd *fd,
                       void *vaddr)
{
        struct device *dev = priv->net_dev->dev.parent;
        dma_addr_t addr = dpaa2_fd_get_addr(fd);
        u8 fd_format = dpaa2_fd_get_format(fd);
        struct dpaa2_sg_entry *sgt;
        void *sg_vaddr;
        int i;

        /* If single buffer frame, just free the data buffer */
        if (fd_format == dpaa2_fd_single)
                goto free_buf;
        else if (fd_format != dpaa2_fd_sg)
                /* We don't support any other format */
                return;

        /* For S/G frames, we first need to free all SG entries */
        sgt = vaddr + dpaa2_fd_get_offset(fd);
        for (i = 0; i < DPAA2_ETH_MAX_SG_ENTRIES; i++) {
                addr = dpaa2_sg_get_addr(&sgt[i]);
                sg_vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr);
                dma_unmap_single(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
                                 DMA_FROM_DEVICE);

                skb_free_frag(sg_vaddr);
                if (dpaa2_sg_is_final(&sgt[i]))
                        break;
        }

free_buf:
        skb_free_frag(vaddr);
}

/* Build a linear skb based on a single-buffer frame descriptor */
static struct sk_buff *build_linear_skb(struct dpaa2_eth_priv *priv,
                                        struct dpaa2_eth_channel *ch,
                                        const struct dpaa2_fd *fd,
                                        void *fd_vaddr)
{
        struct sk_buff *skb = NULL;
        u16 fd_offset = dpaa2_fd_get_offset(fd);
        u32 fd_length = dpaa2_fd_get_len(fd);

        skb = build_skb(fd_vaddr, DPAA2_ETH_RX_BUF_SIZE +
                        SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
        if (unlikely(!skb))
                return NULL;

        skb_reserve(skb, fd_offset);
        skb_put(skb, fd_length);

        ch->buf_count--;

        return skb;
}

/* Build a non linear (fragmented) skb based on a S/G table */
static struct sk_buff *build_frag_skb(struct dpaa2_eth_priv *priv,
                                      struct dpaa2_eth_channel *ch,
                                      struct dpaa2_sg_entry *sgt)
{
        struct sk_buff *skb = NULL;
        struct device *dev = priv->net_dev->dev.parent;
        void *sg_vaddr;
        dma_addr_t sg_addr;
        u16 sg_offset;
        u32 sg_length;
        struct page *page, *head_page;
        int page_offset;
        int i;

        for (i = 0; i < DPAA2_ETH_MAX_SG_ENTRIES; i++) {
                struct dpaa2_sg_entry *sge = &sgt[i];

                /* NOTE: We only support SG entries in dpaa2_sg_single format,
                 * but this is the only format we may receive from HW anyway
                 */

                /* Get the address and length from the S/G entry */
                sg_addr = dpaa2_sg_get_addr(sge);
                sg_vaddr = dpaa2_iova_to_virt(priv->iommu_domain, sg_addr);
                dma_unmap_single(dev, sg_addr, DPAA2_ETH_RX_BUF_SIZE,
                                 DMA_FROM_DEVICE);

                sg_length = dpaa2_sg_get_len(sge);

                if (i == 0) {
                        /* We build the skb around the first data buffer */
                        skb = build_skb(sg_vaddr, DPAA2_ETH_RX_BUF_SIZE +
                                SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
                        if (unlikely(!skb))
                                return NULL;

                        sg_offset = dpaa2_sg_get_offset(sge);
                        skb_reserve(skb, sg_offset);
                        skb_put(skb, sg_length);
                } else {
                        /* Rest of the data buffers are stored as skb frags */
                        page = virt_to_page(sg_vaddr);
                        head_page = virt_to_head_page(sg_vaddr);

                        /* Offset in page (which may be compound).
                         * Data in subsequent SG entries is stored from the
                         * beginning of the buffer, so we don't need to add the
                         * sg_offset.
                         */
                        page_offset = ((unsigned long)sg_vaddr &
                                (PAGE_SIZE - 1)) +
                                (page_address(page) - page_address(head_page));

                        skb_add_rx_frag(skb, i - 1, head_page, page_offset,
                                        sg_length, DPAA2_ETH_RX_BUF_SIZE);
                }

                if (dpaa2_sg_is_final(sge))
                        break;
        }

        /* Count all data buffers + SG table buffer */
        ch->buf_count -= i + 2;

        return skb;
}

/* Main Rx frame processing routine */
static void dpaa2_eth_rx(struct dpaa2_eth_priv *priv,
                         struct dpaa2_eth_channel *ch,
                         const struct dpaa2_fd *fd,
                         struct napi_struct *napi)
{
        dma_addr_t addr = dpaa2_fd_get_addr(fd);
        u8 fd_format = dpaa2_fd_get_format(fd);
        void *vaddr;
        struct sk_buff *skb;
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa2_eth_drv_stats *percpu_extras;
        struct device *dev = priv->net_dev->dev.parent;
        struct dpaa2_fas *fas;
        void *buf_data;
        u32 status = 0;

        /* Tracing point */
        trace_dpaa2_rx_fd(priv->net_dev, fd);

        vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr);
        dma_unmap_single(dev, addr, DPAA2_ETH_RX_BUF_SIZE, DMA_FROM_DEVICE);

        fas = dpaa2_get_fas(vaddr);
        prefetch(fas);
        buf_data = vaddr + dpaa2_fd_get_offset(fd);
        prefetch(buf_data);

        percpu_stats = this_cpu_ptr(priv->percpu_stats);
        percpu_extras = this_cpu_ptr(priv->percpu_extras);

        if (fd_format == dpaa2_fd_single) {
                skb = build_linear_skb(priv, ch, fd, vaddr);
        } else if (fd_format == dpaa2_fd_sg) {
                skb = build_frag_skb(priv, ch, buf_data);
                skb_free_frag(vaddr);
                percpu_extras->rx_sg_frames++;
                percpu_extras->rx_sg_bytes += dpaa2_fd_get_len(fd);
        } else {
                /* We don't support any other format */
                goto err_frame_format;
        }

        if (unlikely(!skb))
                goto err_build_skb;

        prefetch(skb->data);

        /* Check if we need to validate the L4 csum */
        if (likely(dpaa2_fd_get_frc(fd) & DPAA2_FD_FRC_FASV)) {
                status = le32_to_cpu(fas->status);
                validate_rx_csum(priv, status, skb);
        }

        skb->protocol = eth_type_trans(skb, priv->net_dev);

        percpu_stats->rx_packets++;
        percpu_stats->rx_bytes += dpaa2_fd_get_len(fd);

        napi_gro_receive(napi, skb);

        return;

err_build_skb:
        free_rx_fd(priv, fd, vaddr);
err_frame_format:
        percpu_stats->rx_dropped++;
}

/* Consume all frames pull-dequeued into the store. This is the simplest way to
 * make sure we don't accidentally issue another volatile dequeue which would
 * overwrite (leak) frames already in the store.
 *
 * Observance of NAPI budget is not our concern, leaving that to the caller.
 */
static int consume_frames(struct dpaa2_eth_channel *ch)
{
        struct dpaa2_eth_priv *priv = ch->priv;
        struct dpaa2_eth_fq *fq;
        struct dpaa2_dq *dq;
        const struct dpaa2_fd *fd;
        int cleaned = 0;
        int is_last;

        do {
                dq = dpaa2_io_store_next(ch->store, &is_last);
                if (unlikely(!dq)) {
                        /* If we're here, we *must* have placed a
                         * volatile dequeue comnmand, so keep reading through
                         * the store until we get some sort of valid response
                         * token (either a valid frame or an "empty dequeue")
                         */
                        continue;
                }

                fd = dpaa2_dq_fd(dq);
                fq = (struct dpaa2_eth_fq *)dpaa2_dq_fqd_ctx(dq);
                fq->stats.frames++;

                fq->consume(priv, ch, fd, &ch->napi);
                cleaned++;
        } while (!is_last);

        return cleaned;
}

/* Create a frame descriptor based on a fragmented skb */
static int build_sg_fd(struct dpaa2_eth_priv *priv,
                       struct sk_buff *skb,
                       struct dpaa2_fd *fd)
{
        struct device *dev = priv->net_dev->dev.parent;
        void *sgt_buf = NULL;
        dma_addr_t addr;
        int nr_frags = skb_shinfo(skb)->nr_frags;
        struct dpaa2_sg_entry *sgt;
        int i, err;
        int sgt_buf_size;
        struct scatterlist *scl, *crt_scl;
        int num_sg;
        int num_dma_bufs;
        struct dpaa2_eth_swa *swa;
        struct dpaa2_fas *fas;

        /* Create and map scatterlist.
         * We don't advertise NETIF_F_FRAGLIST, so skb_to_sgvec() will not have
         * to go beyond nr_frags+1.
         * Note: We don't support chained scatterlists
         */
        if (unlikely(PAGE_SIZE / sizeof(struct scatterlist) < nr_frags + 1))
                return -EINVAL;

        scl = kcalloc(nr_frags + 1, sizeof(struct scatterlist), GFP_ATOMIC);
        if (unlikely(!scl))
                return -ENOMEM;

        sg_init_table(scl, nr_frags + 1);
        num_sg = skb_to_sgvec(skb, scl, 0, skb->len);
        num_dma_bufs = dma_map_sg(dev, scl, num_sg, DMA_BIDIRECTIONAL);
        if (unlikely(!num_dma_bufs)) {
                err = -ENOMEM;
                goto dma_map_sg_failed;
        }

        /* Prepare the HW SGT structure */
        sgt_buf_size = priv->tx_data_offset +
                       sizeof(struct dpaa2_sg_entry) * (1 + num_dma_bufs);
        sgt_buf = kzalloc(sgt_buf_size + DPAA2_ETH_TX_BUF_ALIGN, GFP_ATOMIC);
        if (unlikely(!sgt_buf)) {
                err = -ENOMEM;
                goto sgt_buf_alloc_failed;
        }
        sgt_buf = PTR_ALIGN(sgt_buf, DPAA2_ETH_TX_BUF_ALIGN);

        /* PTA from egress side is passed as is to the confirmation side so
         * we need to clear some fields here in order to find consistent values
         * on TX confirmation. We are clearing FAS (Frame Annotation Status)
         * field from the hardware annotation area
         */
        fas = dpaa2_get_fas(sgt_buf);
        memset(fas, 0, DPAA2_FAS_SIZE);

        sgt = (struct dpaa2_sg_entry *)(sgt_buf + priv->tx_data_offset);

        /* Fill in the HW SGT structure.
         *
         * sgt_buf is zeroed out, so the following fields are implicit
         * in all sgt entries:
         *   - offset is 0
         *   - format is 'dpaa2_sg_single'
         */
        for_each_sg(scl, crt_scl, num_dma_bufs, i) {
                dpaa2_sg_set_addr(&sgt[i], sg_dma_address(crt_scl));
                dpaa2_sg_set_len(&sgt[i], sg_dma_len(crt_scl));
        }
        dpaa2_sg_set_final(&sgt[i - 1], true);

        /* Store the skb backpointer in the SGT buffer.
         * Fit the scatterlist and the number of buffers alongside the
         * skb backpointer in the software annotation area. We'll need
         * all of them on Tx Conf.
         */
        swa = (struct dpaa2_eth_swa *)sgt_buf;
        swa->skb = skb;
        swa->scl = scl;
        swa->num_sg = num_sg;
        swa->num_dma_bufs = num_dma_bufs;

        /* Separately map the SGT buffer */
        addr = dma_map_single(dev, sgt_buf, sgt_buf_size, DMA_BIDIRECTIONAL);
        if (unlikely(dma_mapping_error(dev, addr))) {
                err = -ENOMEM;
                goto dma_map_single_failed;
        }
        dpaa2_fd_set_offset(fd, priv->tx_data_offset);
        dpaa2_fd_set_format(fd, dpaa2_fd_sg);
        dpaa2_fd_set_addr(fd, addr);
        dpaa2_fd_set_len(fd, skb->len);
        dpaa2_fd_set_ctrl(fd, DPAA2_FD_CTRL_ASAL | DPAA2_FD_CTRL_PTA |
                          DPAA2_FD_CTRL_PTV1);

        return 0;

dma_map_single_failed:
        kfree(sgt_buf);
sgt_buf_alloc_failed:
        dma_unmap_sg(dev, scl, num_sg, DMA_BIDIRECTIONAL);
dma_map_sg_failed:
        kfree(scl);
        return err;
}

/* Create a frame descriptor based on a linear skb */
static int build_single_fd(struct dpaa2_eth_priv *priv,
                           struct sk_buff *skb,
                           struct dpaa2_fd *fd)
{
        struct device *dev = priv->net_dev->dev.parent;
        u8 *buffer_start;
        struct dpaa2_fas *fas;
        struct sk_buff **skbh;
        dma_addr_t addr;

        buffer_start = PTR_ALIGN(skb->data - priv->tx_data_offset -
                                 DPAA2_ETH_TX_BUF_ALIGN,
                                 DPAA2_ETH_TX_BUF_ALIGN);

        /* PTA from egress side is passed as is to the confirmation side so
         * we need to clear some fields here in order to find consistent values
         * on TX confirmation. We are clearing FAS (Frame Annotation Status)
         * field from the hardware annotation area
         */
        fas = dpaa2_get_fas(buffer_start);
        memset(fas, 0, DPAA2_FAS_SIZE);

        /* Store a backpointer to the skb at the beginning of the buffer
         * (in the private data area) such that we can release it
         * on Tx confirm
         */
        skbh = (struct sk_buff **)buffer_start;
        *skbh = skb;

        addr = dma_map_single(dev, buffer_start,
                              skb_tail_pointer(skb) - buffer_start,
                              DMA_BIDIRECTIONAL);
        if (unlikely(dma_mapping_error(dev, addr)))
                return -ENOMEM;

        dpaa2_fd_set_addr(fd, addr);
        dpaa2_fd_set_offset(fd, (u16)(skb->data - buffer_start));
        dpaa2_fd_set_len(fd, skb->len);
        dpaa2_fd_set_format(fd, dpaa2_fd_single);
        dpaa2_fd_set_ctrl(fd, DPAA2_FD_CTRL_ASAL | DPAA2_FD_CTRL_PTA |
                          DPAA2_FD_CTRL_PTV1);

        return 0;
}

/* FD freeing routine on the Tx path
 *
 * DMA-unmap and free FD and possibly SGT buffer allocated on Tx. The skb
 * back-pointed to is also freed.
 * This can be called either from dpaa2_eth_tx_conf() or on the error path of
 * dpaa2_eth_tx().
 * Optionally, return the frame annotation status word (FAS), which needs
 * to be checked if we're on the confirmation path.
 */
static void free_tx_fd(const struct dpaa2_eth_priv *priv,
                       const struct dpaa2_fd *fd,
                       u32 *status)
{
        struct device *dev = priv->net_dev->dev.parent;
        dma_addr_t fd_addr;
        struct sk_buff **skbh, *skb;
        unsigned char *buffer_start;
        int unmap_size;
        struct scatterlist *scl;
        int num_sg, num_dma_bufs;
        struct dpaa2_eth_swa *swa;
        u8 fd_format = dpaa2_fd_get_format(fd);
        struct dpaa2_fas *fas;

        fd_addr = dpaa2_fd_get_addr(fd);
        skbh = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
        fas = dpaa2_get_fas(skbh);

        if (fd_format == dpaa2_fd_single) {
                skb = *skbh;
                buffer_start = (unsigned char *)skbh;
                /* Accessing the skb buffer is safe before dma unmap, because
                 * we didn't map the actual skb shell.
                 */
                dma_unmap_single(dev, fd_addr,
                                 skb_tail_pointer(skb) - buffer_start,
                                 DMA_BIDIRECTIONAL);
        } else if (fd_format == dpaa2_fd_sg) {
                swa = (struct dpaa2_eth_swa *)skbh;
                skb = swa->skb;
                scl = swa->scl;
                num_sg = swa->num_sg;
                num_dma_bufs = swa->num_dma_bufs;

                /* Unmap the scatterlist */
                dma_unmap_sg(dev, scl, num_sg, DMA_BIDIRECTIONAL);
                kfree(scl);

                /* Unmap the SGT buffer */
                unmap_size = priv->tx_data_offset +
                       sizeof(struct dpaa2_sg_entry) * (1 + num_dma_bufs);
                dma_unmap_single(dev, fd_addr, unmap_size, DMA_BIDIRECTIONAL);
        } else {
                /* Unsupported format, mark it as errored and give up */
                if (status)
                        *status = ~0;
                return;
        }

        /* Read the status from the Frame Annotation after we unmap the first
         * buffer but before we free it. The caller function is responsible
         * for checking the status value.
         */
        if (status)
                *status = le32_to_cpu(fas->status);

        /* Free SGT buffer kmalloc'ed on tx */
        if (fd_format != dpaa2_fd_single)
                kfree(skbh);

        /* Move on with skb release */
        dev_kfree_skb(skb);
}

static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct dpaa2_fd fd;
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa2_eth_drv_stats *percpu_extras;
        struct dpaa2_eth_fq *fq;
        u16 queue_mapping;
        int err, i;

        percpu_stats = this_cpu_ptr(priv->percpu_stats);
        percpu_extras = this_cpu_ptr(priv->percpu_extras);

        if (unlikely(skb_headroom(skb) < DPAA2_ETH_NEEDED_HEADROOM(priv))) {
                struct sk_buff *ns;

                ns = skb_realloc_headroom(skb, DPAA2_ETH_NEEDED_HEADROOM(priv));
                if (unlikely(!ns)) {
                        percpu_stats->tx_dropped++;
                        goto err_alloc_headroom;
                }
                dev_kfree_skb(skb);
                skb = ns;
        }

        /* We'll be holding a back-reference to the skb until Tx Confirmation;
         * we don't want that overwritten by a concurrent Tx with a cloned skb.
         */
        skb = skb_unshare(skb, GFP_ATOMIC);
        if (unlikely(!skb)) {
                /* skb_unshare() has already freed the skb */
                percpu_stats->tx_dropped++;
                return NETDEV_TX_OK;
        }

        /* Setup the FD fields */
        memset(&fd, 0, sizeof(fd));

        if (skb_is_nonlinear(skb)) {
                err = build_sg_fd(priv, skb, &fd);
                percpu_extras->tx_sg_frames++;
                percpu_extras->tx_sg_bytes += skb->len;
        } else {
                err = build_single_fd(priv, skb, &fd);
        }

        if (unlikely(err)) {
                percpu_stats->tx_dropped++;
                goto err_build_fd;
        }

        /* Tracing point */
        trace_dpaa2_tx_fd(net_dev, &fd);

        /* TxConf FQ selection primarily based on cpu affinity; this is
         * non-migratable context, so it's safe to call smp_processor_id().
         */
        queue_mapping = smp_processor_id() % dpaa2_eth_queue_count(priv);
        fq = &priv->fq[queue_mapping];
        for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
                err = dpaa2_io_service_enqueue_qd(NULL, priv->tx_qdid, 0,
                                                  fq->tx_qdbin, &fd);
                if (err != -EBUSY)
                        break;
        }
        percpu_extras->tx_portal_busy += i;
        if (unlikely(err < 0)) {
                percpu_stats->tx_errors++;
                /* Clean up everything, including freeing the skb */
                free_tx_fd(priv, &fd, NULL);
        } else {
                percpu_stats->tx_packets++;
                percpu_stats->tx_bytes += dpaa2_fd_get_len(&fd);
        }

        return NETDEV_TX_OK;

err_build_fd:
err_alloc_headroom:
        dev_kfree_skb(skb);

        return NETDEV_TX_OK;
}

/* Tx confirmation frame processing routine */
static void dpaa2_eth_tx_conf(struct dpaa2_eth_priv *priv,
                              struct dpaa2_eth_channel *ch,
                              const struct dpaa2_fd *fd,
                              struct napi_struct *napi __always_unused)
{
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa2_eth_drv_stats *percpu_extras;
        u32 status = 0;
        u32 fd_errors;
        bool has_fas_errors = false;

        /* Tracing point */
        trace_dpaa2_tx_conf_fd(priv->net_dev, fd);

        percpu_extras = this_cpu_ptr(priv->percpu_extras);
        percpu_extras->tx_conf_frames++;
        percpu_extras->tx_conf_bytes += dpaa2_fd_get_len(fd);

        /* Check frame errors in the FD field */
        fd_errors = dpaa2_fd_get_ctrl(fd) & DPAA2_FD_TX_ERR_MASK;
        if (unlikely(fd_errors)) {
                /* We only check error bits in the FAS field if corresponding
                 * FAERR bit is set in FD and the FAS field is marked as valid
                 */
                has_fas_errors = (fd_errors & DPAA2_FD_CTRL_FAERR) &&
                                 !!(dpaa2_fd_get_frc(fd) & DPAA2_FD_FRC_FASV);
                if (net_ratelimit())
                        netdev_dbg(priv->net_dev, "TX frame FD error: 0x%08x\n",
                                   fd_errors);
        }

        free_tx_fd(priv, fd, has_fas_errors ? &status : NULL);

        if (likely(!fd_errors))
                return;

        percpu_stats = this_cpu_ptr(priv->percpu_stats);
        /* Tx-conf logically pertains to the egress path. */
        percpu_stats->tx_errors++;

        if (has_fas_errors && net_ratelimit())
                netdev_dbg(priv->net_dev, "TX frame FAS error: 0x%08x\n",
                           status & DPAA2_FAS_TX_ERR_MASK);
}

static int set_rx_csum(struct dpaa2_eth_priv *priv, bool enable)
{
        int err;

        err = dpni_set_offload(priv->mc_io, 0, priv->mc_token,
                               DPNI_OFF_RX_L3_CSUM, enable);
        if (err) {
                netdev_err(priv->net_dev,
                           "dpni_set_offload(RX_L3_CSUM) failed\n");
                return err;
        }

        err = dpni_set_offload(priv->mc_io, 0, priv->mc_token,
                               DPNI_OFF_RX_L4_CSUM, enable);
        if (err) {
                netdev_err(priv->net_dev,
                           "dpni_set_offload(RX_L4_CSUM) failed\n");
                return err;
        }

        return 0;
}

static int set_tx_csum(struct dpaa2_eth_priv *priv, bool enable)
{
        int err;

        err = dpni_set_offload(priv->mc_io, 0, priv->mc_token,
                               DPNI_OFF_TX_L3_CSUM, enable);
        if (err) {
                netdev_err(priv->net_dev, "dpni_set_offload(TX_L3_CSUM) failed\n");
                return err;
        }

        err = dpni_set_offload(priv->mc_io, 0, priv->mc_token,
                               DPNI_OFF_TX_L4_CSUM, enable);
        if (err) {
                netdev_err(priv->net_dev, "dpni_set_offload(TX_L4_CSUM) failed\n");
                return err;
        }

        return 0;
}

/* Perform a single release command to add buffers
 * to the specified buffer pool
 */
static int add_bufs(struct dpaa2_eth_priv *priv, u16 bpid)
{
        struct device *dev = priv->net_dev->dev.parent;
        u64 buf_array[DPAA2_ETH_BUFS_PER_CMD];
        void *buf;
        dma_addr_t addr;
        int i;

        for (i = 0; i < DPAA2_ETH_BUFS_PER_CMD; i++) {
                /* Allocate buffer visible to WRIOP + skb shared info +
                 * alignment padding
                 */
                buf = napi_alloc_frag(DPAA2_ETH_BUF_RAW_SIZE);
                if (unlikely(!buf))
                        goto err_alloc;

                buf = PTR_ALIGN(buf, DPAA2_ETH_RX_BUF_ALIGN);

                addr = dma_map_single(dev, buf, DPAA2_ETH_RX_BUF_SIZE,
                                      DMA_FROM_DEVICE);
                if (unlikely(dma_mapping_error(dev, addr)))
                        goto err_map;

                buf_array[i] = addr;

                /* tracing point */
                trace_dpaa2_eth_buf_seed(priv->net_dev,
                                         buf, DPAA2_ETH_BUF_RAW_SIZE,
                                         addr, DPAA2_ETH_RX_BUF_SIZE,
                                         bpid);
        }

release_bufs:
        /* In case the portal is busy, retry until successful.
         * The buffer release function would only fail if the QBMan portal
         * was busy, which implies portal contention (i.e. more CPUs than
         * portals, i.e. GPPs w/o affine DPIOs). For all practical purposes,
         * there is little we can realistically do, short of giving up -
         * in which case we'd risk depleting the buffer pool and never again
         * receiving the Rx interrupt which would kick-start the refill logic.
         * So just keep retrying, at the risk of being moved to ksoftirqd.
         */
        while (dpaa2_io_service_release(NULL, bpid, buf_array, i))
                cpu_relax();
        return i;

err_map:
        skb_free_frag(buf);
err_alloc:
        if (i)
                goto release_bufs;

        return 0;
}

static int seed_pool(struct dpaa2_eth_priv *priv, u16 bpid)
{
        int i, j;
        int new_count;

        /* This is the lazy seeding of Rx buffer pools.
         * dpaa2_add_bufs() is also used on the Rx hotpath and calls
         * napi_alloc_frag(). The trouble with that is that it in turn ends up
         * calling this_cpu_ptr(), which mandates execution in atomic context.
         * Rather than splitting up the code, do a one-off preempt disable.
         */
        preempt_disable();
        for (j = 0; j < priv->num_channels; j++) {
                for (i = 0; i < DPAA2_ETH_NUM_BUFS;
                     i += DPAA2_ETH_BUFS_PER_CMD) {
                        new_count = add_bufs(priv, bpid);
                        priv->channel[j]->buf_count += new_count;

                        if (new_count < DPAA2_ETH_BUFS_PER_CMD) {
                                preempt_enable();
                                return -ENOMEM;
                        }
                }
        }
        preempt_enable();

        return 0;
}

/**
 * Drain the specified number of buffers from the DPNI's private buffer pool.
 * @count must not exceeed DPAA2_ETH_BUFS_PER_CMD
 */
static void drain_bufs(struct dpaa2_eth_priv *priv, int count)
{
        struct device *dev = priv->net_dev->dev.parent;
        u64 buf_array[DPAA2_ETH_BUFS_PER_CMD];
        void *vaddr;
        int ret, i;

        do {
                ret = dpaa2_io_service_acquire(NULL, priv->bpid,
                                               buf_array, count);
                if (ret < 0) {
                        netdev_err(priv->net_dev, "dpaa2_io_service_acquire() failed\n");
                        return;
                }
                for (i = 0; i < ret; i++) {
                        /* Same logic as on regular Rx path */
                        vaddr = dpaa2_iova_to_virt(priv->iommu_domain,
                                                   buf_array[i]);
                        dma_unmap_single(dev, buf_array[i],
                                         DPAA2_ETH_RX_BUF_SIZE,
                                         DMA_FROM_DEVICE);
                        skb_free_frag(vaddr);
                }
        } while (ret);
}

static void drain_pool(struct dpaa2_eth_priv *priv)
{
        int i;

        drain_bufs(priv, DPAA2_ETH_BUFS_PER_CMD);
        drain_bufs(priv, 1);

        for (i = 0; i < priv->num_channels; i++)
                priv->channel[i]->buf_count = 0;
}

/* Function is called from softirq context only, so we don't need to guard
 * the access to percpu count
 */
static int refill_pool(struct dpaa2_eth_priv *priv,
                       struct dpaa2_eth_channel *ch,
                       u16 bpid)
{
        int new_count;

        if (likely(ch->buf_count >= DPAA2_ETH_REFILL_THRESH))
                return 0;

        do {
                new_count = add_bufs(priv, bpid);
                if (unlikely(!new_count)) {
                        /* Out of memory; abort for now, we'll try later on */
                        break;
                }
                ch->buf_count += new_count;
        } while (ch->buf_count < DPAA2_ETH_NUM_BUFS);

        if (unlikely(ch->buf_count < DPAA2_ETH_NUM_BUFS))
                return -ENOMEM;

        return 0;
}

static int pull_channel(struct dpaa2_eth_channel *ch)
{
        int err;
        int dequeues = -1;

        /* Retry while portal is busy */
        do {
                err = dpaa2_io_service_pull_channel(NULL, ch->ch_id, ch->store);
                dequeues++;
                cpu_relax();
        } while (err == -EBUSY);

        ch->stats.dequeue_portal_busy += dequeues;
        if (unlikely(err))
                ch->stats.pull_err++;

        return err;
}

/* NAPI poll routine
 *
 * Frames are dequeued from the QMan channel associated with this NAPI context.
 * Rx, Tx confirmation and (if configured) Rx error frames all count
 * towards the NAPI budget.
 */
static int dpaa2_eth_poll(struct napi_struct *napi, int budget)
{
        struct dpaa2_eth_channel *ch;
        int cleaned = 0, store_cleaned;
        struct dpaa2_eth_priv *priv;
        int err;

        ch = container_of(napi, struct dpaa2_eth_channel, napi);
        priv = ch->priv;

        while (cleaned < budget) {
                err = pull_channel(ch);
                if (unlikely(err))
                        break;

                /* Refill pool if appropriate */
                refill_pool(priv, ch, priv->bpid);

                store_cleaned = consume_frames(ch);
                cleaned += store_cleaned;

                /* If we have enough budget left for a full store,
                 * try a new pull dequeue, otherwise we're done here
                 */
                if (store_cleaned == 0 ||
                    cleaned > budget - DPAA2_ETH_STORE_SIZE)
                        break;
        }

        if (cleaned < budget) {
                napi_complete_done(napi, cleaned);
                /* Re-enable data available notifications */
                do {
                        err = dpaa2_io_service_rearm(NULL, &ch->nctx);
                        cpu_relax();
                } while (err == -EBUSY);
        }

        ch->stats.frames += cleaned;

        return cleaned;
}

static void enable_ch_napi(struct dpaa2_eth_priv *priv)
{
        struct dpaa2_eth_channel *ch;
        int i;

        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                napi_enable(&ch->napi);
        }
}

static void disable_ch_napi(struct dpaa2_eth_priv *priv)
{
        struct dpaa2_eth_channel *ch;
        int i;

        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                napi_disable(&ch->napi);
        }
}

static int link_state_update(struct dpaa2_eth_priv *priv)
{
        struct dpni_link_state state;
        int err;

        err = dpni_get_link_state(priv->mc_io, 0, priv->mc_token, &state);
        if (unlikely(err)) {
                netdev_err(priv->net_dev,
                           "dpni_get_link_state() failed\n");
                return err;
        }

        /* Chech link state; speed / duplex changes are not treated yet */
        if (priv->link_state.up == state.up)
                return 0;

        priv->link_state = state;
        if (state.up) {
                netif_carrier_on(priv->net_dev);
                netif_tx_start_all_queues(priv->net_dev);
        } else {
                netif_tx_stop_all_queues(priv->net_dev);
                netif_carrier_off(priv->net_dev);
        }

        netdev_info(priv->net_dev, "Link Event: state %s\n",
                    state.up ? "up" : "down");

        return 0;
}

static int dpaa2_eth_open(struct net_device *net_dev)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        int err;

        err = seed_pool(priv, priv->bpid);
        if (err) {
                /* Not much to do; the buffer pool, though not filled up,
                 * may still contain some buffers which would enable us
                 * to limp on.
                 */
                netdev_err(net_dev, "Buffer seeding failed for DPBP %d (bpid=%d)\n",
                           priv->dpbp_dev->obj_desc.id, priv->bpid);
        }

        /* We'll only start the txqs when the link is actually ready; make sure
         * we don't race against the link up notification, which may come
         * immediately after dpni_enable();
         */
        netif_tx_stop_all_queues(net_dev);
        enable_ch_napi(priv);
        /* Also, explicitly set carrier off, otherwise netif_carrier_ok() will
         * return true and cause 'ip link show' to report the LOWER_UP flag,
         * even though the link notification wasn't even received.
         */
        netif_carrier_off(net_dev);

        err = dpni_enable(priv->mc_io, 0, priv->mc_token);
        if (err < 0) {
                netdev_err(net_dev, "dpni_enable() failed\n");
                goto enable_err;
        }

        /* If the DPMAC object has already processed the link up interrupt,
         * we have to learn the link state ourselves.
         */
        err = link_state_update(priv);
        if (err < 0) {
                netdev_err(net_dev, "Can't update link state\n");
                goto link_state_err;
        }

        return 0;

link_state_err:
enable_err:
        disable_ch_napi(priv);
        drain_pool(priv);
        return err;
}

/* The DPIO store must be empty when we call this,
 * at the end of every NAPI cycle.
 */
static u32 drain_channel(struct dpaa2_eth_priv *priv,
                         struct dpaa2_eth_channel *ch)
{
        u32 drained = 0, total = 0;

        do {
                pull_channel(ch);
                drained = consume_frames(ch);
                total += drained;
        } while (drained);

        return total;
}

static u32 drain_ingress_frames(struct dpaa2_eth_priv *priv)
{
        struct dpaa2_eth_channel *ch;
        int i;
        u32 drained = 0;

        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                drained += drain_channel(priv, ch);
        }

        return drained;
}

static int dpaa2_eth_stop(struct net_device *net_dev)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        int dpni_enabled;
        int retries = 10;
        u32 drained;

        netif_tx_stop_all_queues(net_dev);
        netif_carrier_off(net_dev);

        /* Loop while dpni_disable() attempts to drain the egress FQs
         * and confirm them back to us.
         */
        do {
                dpni_disable(priv->mc_io, 0, priv->mc_token);
                dpni_is_enabled(priv->mc_io, 0, priv->mc_token, &dpni_enabled);
                if (dpni_enabled)
                        /* Allow the hardware some slack */
                        msleep(100);
        } while (dpni_enabled && --retries);
        if (!retries) {
                netdev_warn(net_dev, "Retry count exceeded disabling DPNI\n");
                /* Must go on and disable NAPI nonetheless, so we don't crash at
                 * the next "ifconfig up"
                 */
        }

        /* Wait for NAPI to complete on every core and disable it.
         * In particular, this will also prevent NAPI from being rescheduled if
         * a new CDAN is serviced, effectively discarding the CDAN. We therefore
         * don't even need to disarm the channels, except perhaps for the case
         * of a huge coalescing value.
         */
        disable_ch_napi(priv);

         /* Manually drain the Rx and TxConf queues */
        drained = drain_ingress_frames(priv);
        if (drained)
                netdev_dbg(net_dev, "Drained %d frames.\n", drained);

        /* Empty the buffer pool */
        drain_pool(priv);

        return 0;
}

static int dpaa2_eth_init(struct net_device *net_dev)
{
        u64 supported = 0;
        u64 not_supported = 0;
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        u32 options = priv->dpni_attrs.options;

        /* Capabilities listing */
        supported |= IFF_LIVE_ADDR_CHANGE;

        if (options & DPNI_OPT_NO_MAC_FILTER)
                not_supported |= IFF_UNICAST_FLT;
        else
                supported |= IFF_UNICAST_FLT;

        net_dev->priv_flags |= supported;
        net_dev->priv_flags &= ~not_supported;

        /* Features */
        net_dev->features = NETIF_F_RXCSUM |
                            NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                            NETIF_F_SG | NETIF_F_HIGHDMA |
                            NETIF_F_LLTX;
        net_dev->hw_features = net_dev->features;

        return 0;
}

static int dpaa2_eth_set_addr(struct net_device *net_dev, void *addr)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct device *dev = net_dev->dev.parent;
        int err;

        err = eth_mac_addr(net_dev, addr);
        if (err < 0) {
                dev_err(dev, "eth_mac_addr() failed (%d)\n", err);
                return err;
        }

        err = dpni_set_primary_mac_addr(priv->mc_io, 0, priv->mc_token,
                                        net_dev->dev_addr);
        if (err) {
                dev_err(dev, "dpni_set_primary_mac_addr() failed (%d)\n", err);
                return err;
        }

        return 0;
}

/** Fill in counters maintained by the GPP driver. These may be different from
 * the hardware counters obtained by ethtool.
 */
static void dpaa2_eth_get_stats(struct net_device *net_dev,
                                struct rtnl_link_stats64 *stats)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct rtnl_link_stats64 *percpu_stats;
        u64 *cpustats;
        u64 *netstats = (u64 *)stats;
        int i, j;
        int num = sizeof(struct rtnl_link_stats64) / sizeof(u64);

        for_each_possible_cpu(i) {
                percpu_stats = per_cpu_ptr(priv->percpu_stats, i);
                cpustats = (u64 *)percpu_stats;
                for (j = 0; j < num; j++)
                        netstats[j] += cpustats[j];
        }
}

static int dpaa2_eth_change_mtu(struct net_device *net_dev, int mtu)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        int err;

        /* Set the maximum Rx frame length to match the transmit side;
         * account for L2 headers when computing the MFL
         */
        err = dpni_set_max_frame_length(priv->mc_io, 0, priv->mc_token,
                                        (u16)DPAA2_ETH_L2_MAX_FRM(mtu));
        if (err) {
                netdev_err(net_dev, "dpni_set_max_frame_length() failed\n");
                return err;
        }

        net_dev->mtu = mtu;
        return 0;
}

/* Copy mac unicast addresses from @net_dev to @priv.
 * Its sole purpose is to make dpaa2_eth_set_rx_mode() more readable.
 */
static void add_uc_hw_addr(const struct net_device *net_dev,
                           struct dpaa2_eth_priv *priv)
{
        struct netdev_hw_addr *ha;
        int err;

        netdev_for_each_uc_addr(ha, net_dev) {
                err = dpni_add_mac_addr(priv->mc_io, 0, priv->mc_token,
                                        ha->addr);
                if (err)
                        netdev_warn(priv->net_dev,
                                    "Could not add ucast MAC %pM to the filtering table (err %d)\n",
                                    ha->addr, err);
        }
}

/* Copy mac multicast addresses from @net_dev to @priv
 * Its sole purpose is to make dpaa2_eth_set_rx_mode() more readable.
 */
static void add_mc_hw_addr(const struct net_device *net_dev,
                           struct dpaa2_eth_priv *priv)
{
        struct netdev_hw_addr *ha;
        int err;

        netdev_for_each_mc_addr(ha, net_dev) {
                err = dpni_add_mac_addr(priv->mc_io, 0, priv->mc_token,
                                        ha->addr);
                if (err)
                        netdev_warn(priv->net_dev,
                                    "Could not add mcast MAC %pM to the filtering table (err %d)\n",
                                    ha->addr, err);
        }
}

static void dpaa2_eth_set_rx_mode(struct net_device *net_dev)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        int uc_count = netdev_uc_count(net_dev);
        int mc_count = netdev_mc_count(net_dev);
        u8 max_mac = priv->dpni_attrs.mac_filter_entries;
        u32 options = priv->dpni_attrs.options;
        u16 mc_token = priv->mc_token;
        struct fsl_mc_io *mc_io = priv->mc_io;
        int err;

        /* Basic sanity checks; these probably indicate a misconfiguration */
        if (options & DPNI_OPT_NO_MAC_FILTER && max_mac != 0)
                netdev_info(net_dev,
                            "mac_filter_entries=%d, DPNI_OPT_NO_MAC_FILTER option must be disabled\n",
                            max_mac);

        /* Force promiscuous if the uc or mc counts exceed our capabilities. */
        if (uc_count > max_mac) {
                netdev_info(net_dev,
                            "Unicast addr count reached %d, max allowed is %d; forcing promisc\n",
                            uc_count, max_mac);
                goto force_promisc;
        }
        if (mc_count + uc_count > max_mac) {
                netdev_info(net_dev,
                            "Unicast + multicast addr count reached %d, max allowed is %d; forcing promisc\n",
                            uc_count + mc_count, max_mac);
                goto force_mc_promisc;
        }

        /* Adjust promisc settings due to flag combinations */
        if (net_dev->flags & IFF_PROMISC)
                goto force_promisc;
        if (net_dev->flags & IFF_ALLMULTI) {
                /* First, rebuild unicast filtering table. This should be done
                 * in promisc mode, in order to avoid frame loss while we
                 * progressively add entries to the table.
                 * We don't know whether we had been in promisc already, and
                 * making an MC call to find out is expensive; so set uc promisc
                 * nonetheless.
                 */
                err = dpni_set_unicast_promisc(mc_io, 0, mc_token, 1);
                if (err)
                        netdev_warn(net_dev, "Can't set uc promisc\n");

                /* Actual uc table reconstruction. */
                err = dpni_clear_mac_filters(mc_io, 0, mc_token, 1, 0);
                if (err)
                        netdev_warn(net_dev, "Can't clear uc filters\n");
                add_uc_hw_addr(net_dev, priv);

                /* Finally, clear uc promisc and set mc promisc as requested. */
                err = dpni_set_unicast_promisc(mc_io, 0, mc_token, 0);
                if (err)
                        netdev_warn(net_dev, "Can't clear uc promisc\n");
                goto force_mc_promisc;
        }

        /* Neither unicast, nor multicast promisc will be on... eventually.
         * For now, rebuild mac filtering tables while forcing both of them on.
         */
        err = dpni_set_unicast_promisc(mc_io, 0, mc_token, 1);
        if (err)
                netdev_warn(net_dev, "Can't set uc promisc (%d)\n", err);
        err = dpni_set_multicast_promisc(mc_io, 0, mc_token, 1);
        if (err)
                netdev_warn(net_dev, "Can't set mc promisc (%d)\n", err);

        /* Actual mac filtering tables reconstruction */
        err = dpni_clear_mac_filters(mc_io, 0, mc_token, 1, 1);
        if (err)
                netdev_warn(net_dev, "Can't clear mac filters\n");
        add_mc_hw_addr(net_dev, priv);
        add_uc_hw_addr(net_dev, priv);

        /* Now we can clear both ucast and mcast promisc, without risking
         * to drop legitimate frames anymore.
         */
        err = dpni_set_unicast_promisc(mc_io, 0, mc_token, 0);
        if (err)
                netdev_warn(net_dev, "Can't clear ucast promisc\n");
        err = dpni_set_multicast_promisc(mc_io, 0, mc_token, 0);
        if (err)
                netdev_warn(net_dev, "Can't clear mcast promisc\n");

        return;

force_promisc:
        err = dpni_set_unicast_promisc(mc_io, 0, mc_token, 1);
        if (err)
                netdev_warn(net_dev, "Can't set ucast promisc\n");
force_mc_promisc:
        err = dpni_set_multicast_promisc(mc_io, 0, mc_token, 1);
        if (err)
                netdev_warn(net_dev, "Can't set mcast promisc\n");
}

static int dpaa2_eth_set_features(struct net_device *net_dev,
                                  netdev_features_t features)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        netdev_features_t changed = features ^ net_dev->features;
        bool enable;
        int err;

        if (changed & NETIF_F_RXCSUM) {
                enable = !!(features & NETIF_F_RXCSUM);
                err = set_rx_csum(priv, enable);
                if (err)
                        return err;
        }

        if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) {
                enable = !!(features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
                err = set_tx_csum(priv, enable);
                if (err)
                        return err;
        }

        return 0;
}

static const struct net_device_ops dpaa2_eth_ops = {
        .ndo_open = dpaa2_eth_open,
        .ndo_start_xmit = dpaa2_eth_tx,
        .ndo_stop = dpaa2_eth_stop,
        .ndo_init = dpaa2_eth_init,
        .ndo_set_mac_address = dpaa2_eth_set_addr,
        .ndo_get_stats64 = dpaa2_eth_get_stats,
        .ndo_change_mtu = dpaa2_eth_change_mtu,
        .ndo_set_rx_mode = dpaa2_eth_set_rx_mode,
        .ndo_set_features = dpaa2_eth_set_features,
};

static void cdan_cb(struct dpaa2_io_notification_ctx *ctx)
{
        struct dpaa2_eth_channel *ch;

        ch = container_of(ctx, struct dpaa2_eth_channel, nctx);

        /* Update NAPI statistics */
        ch->stats.cdan++;

        napi_schedule_irqoff(&ch->napi);
}

/* Allocate and configure a DPCON object */
static struct fsl_mc_device *setup_dpcon(struct dpaa2_eth_priv *priv)
{
        struct fsl_mc_device *dpcon;
        struct device *dev = priv->net_dev->dev.parent;
        struct dpcon_attr attrs;
        int err;

        err = fsl_mc_object_allocate(to_fsl_mc_device(dev),
                                     FSL_MC_POOL_DPCON, &dpcon);
        if (err) {
                dev_info(dev, "Not enough DPCONs, will go on as-is\n");
                return NULL;
        }

        err = dpcon_open(priv->mc_io, 0, dpcon->obj_desc.id, &dpcon->mc_handle);
        if (err) {
                dev_err(dev, "dpcon_open() failed\n");
                goto err_open;
        }

        err = dpcon_reset(priv->mc_io, 0, dpcon->mc_handle);
        if (err) {
                dev_err(dev, "dpcon_reset() failed\n");
                goto err_reset;
        }

        err = dpcon_get_attributes(priv->mc_io, 0, dpcon->mc_handle, &attrs);
        if (err) {
                dev_err(dev, "dpcon_get_attributes() failed\n");
                goto err_get_attr;
        }

        err = dpcon_enable(priv->mc_io, 0, dpcon->mc_handle);
        if (err) {
                dev_err(dev, "dpcon_enable() failed\n");
                goto err_enable;
        }

        return dpcon;

err_enable:
err_get_attr:
err_reset:
        dpcon_close(priv->mc_io, 0, dpcon->mc_handle);
err_open:
        fsl_mc_object_free(dpcon);

        return NULL;
}

static void free_dpcon(struct dpaa2_eth_priv *priv,
                       struct fsl_mc_device *dpcon)
{
        dpcon_disable(priv->mc_io, 0, dpcon->mc_handle);
        dpcon_close(priv->mc_io, 0, dpcon->mc_handle);
        fsl_mc_object_free(dpcon);
}

static struct dpaa2_eth_channel *
alloc_channel(struct dpaa2_eth_priv *priv)
{
        struct dpaa2_eth_channel *channel;
        struct dpcon_attr attr;
        struct device *dev = priv->net_dev->dev.parent;
        int err;

        channel = kzalloc(sizeof(*channel), GFP_KERNEL);
        if (!channel)
                return NULL;

        channel->dpcon = setup_dpcon(priv);
        if (!channel->dpcon)
                goto err_setup;

        err = dpcon_get_attributes(priv->mc_io, 0, channel->dpcon->mc_handle,
                                   &attr);
        if (err) {
                dev_err(dev, "dpcon_get_attributes() failed\n");
                goto err_get_attr;
        }

        channel->dpcon_id = attr.id;
        channel->ch_id = attr.qbman_ch_id;
        channel->priv = priv;

        return channel;

err_get_attr:
        free_dpcon(priv, channel->dpcon);
err_setup:
        kfree(channel);
        return NULL;
}

static void free_channel(struct dpaa2_eth_priv *priv,
                         struct dpaa2_eth_channel *channel)
{
        free_dpcon(priv, channel->dpcon);
        kfree(channel);
}

/* DPIO setup: allocate and configure QBMan channels, setup core affinity
 * and register data availability notifications
 */
static int setup_dpio(struct dpaa2_eth_priv *priv)
{
        struct dpaa2_io_notification_ctx *nctx;
        struct dpaa2_eth_channel *channel;
        struct dpcon_notification_cfg dpcon_notif_cfg;
        struct device *dev = priv->net_dev->dev.parent;
        int i, err;

        /* We want the ability to spread ingress traffic (RX, TX conf) to as
         * many cores as possible, so we need one channel for each core
         * (unless there's fewer queues than cores, in which case the extra
         * channels would be wasted).
         * Allocate one channel per core and register it to the core's
         * affine DPIO. If not enough channels are available for all cores
         * or if some cores don't have an affine DPIO, there will be no
         * ingress frame processing on those cores.
         */
        cpumask_clear(&priv->dpio_cpumask);
        for_each_online_cpu(i) {
                /* Try to allocate a channel */
                channel = alloc_channel(priv);
                if (!channel) {
                        dev_info(dev,
                                 "No affine channel for cpu %d and above\n", i);
                        err = -ENODEV;
                        goto err_alloc_ch;
                }

                priv->channel[priv->num_channels] = channel;

                nctx = &channel->nctx;
                nctx->is_cdan = 1;
                nctx->cb = cdan_cb;
                nctx->id = channel->ch_id;
                nctx->desired_cpu = i;

                /* Register the new context */
                err = dpaa2_io_service_register(NULL, nctx);
                if (err) {
                        dev_dbg(dev, "No affine DPIO for cpu %d\n", i);
                        /* If no affine DPIO for this core, there's probably
                         * none available for next cores either. Signal we want
                         * to retry later, in case the DPIO devices weren't
                         * probed yet.
                         */
                        err = -EPROBE_DEFER;
                        goto err_service_reg;
                }

                /* Register DPCON notification with MC */
                dpcon_notif_cfg.dpio_id = nctx->dpio_id;
                dpcon_notif_cfg.priority = 0;
                dpcon_notif_cfg.user_ctx = nctx->qman64;
                err = dpcon_set_notification(priv->mc_io, 0,
                                             channel->dpcon->mc_handle,
                                             &dpcon_notif_cfg);
                if (err) {
                        dev_err(dev, "dpcon_set_notification failed()\n");
                        goto err_set_cdan;
                }

                /* If we managed to allocate a channel and also found an affine
                 * DPIO for this core, add it to the final mask
                 */
                cpumask_set_cpu(i, &priv->dpio_cpumask);
                priv->num_channels++;

                /* Stop if we already have enough channels to accommodate all
                 * RX and TX conf queues
                 */
                if (priv->num_channels == dpaa2_eth_queue_count(priv))
                        break;
        }

        return 0;

err_set_cdan:
        dpaa2_io_service_deregister(NULL, nctx);
err_service_reg:
        free_channel(priv, channel);
err_alloc_ch:
        if (cpumask_empty(&priv->dpio_cpumask)) {
                dev_err(dev, "No cpu with an affine DPIO/DPCON\n");
                return err;
        }

        dev_info(dev, "Cores %*pbl available for processing ingress traffic\n",
                 cpumask_pr_args(&priv->dpio_cpumask));

        return 0;
}

static void free_dpio(struct dpaa2_eth_priv *priv)
{
        int i;
        struct dpaa2_eth_channel *ch;

        /* deregister CDAN notifications and free channels */
        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                dpaa2_io_service_deregister(NULL, &ch->nctx);
                free_channel(priv, ch);
        }
}

static struct dpaa2_eth_channel *get_affine_channel(struct dpaa2_eth_priv *priv,
                                                    int cpu)
{
        struct device *dev = priv->net_dev->dev.parent;
        int i;

        for (i = 0; i < priv->num_channels; i++)
                if (priv->channel[i]->nctx.desired_cpu == cpu)
                        return priv->channel[i];

        /* We should never get here. Issue a warning and return
         * the first channel, because it's still better than nothing
         */
        dev_warn(dev, "No affine channel found for cpu %d\n", cpu);

        return priv->channel[0];
}

static void set_fq_affinity(struct dpaa2_eth_priv *priv)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpaa2_eth_fq *fq;
        int rx_cpu, txc_cpu;
        int i;

        /* For each FQ, pick one channel/CPU to deliver frames to.
         * This may well change at runtime, either through irqbalance or
         * through direct user intervention.
         */
        rx_cpu = txc_cpu = cpumask_first(&priv->dpio_cpumask);

        for (i = 0; i < priv->num_fqs; i++) {
                fq = &priv->fq[i];
                switch (fq->type) {
                case DPAA2_RX_FQ:
                        fq->target_cpu = rx_cpu;
                        rx_cpu = cpumask_next(rx_cpu, &priv->dpio_cpumask);
                        if (rx_cpu >= nr_cpu_ids)
                                rx_cpu = cpumask_first(&priv->dpio_cpumask);
                        break;
                case DPAA2_TX_CONF_FQ:
                        fq->target_cpu = txc_cpu;
                        txc_cpu = cpumask_next(txc_cpu, &priv->dpio_cpumask);
                        if (txc_cpu >= nr_cpu_ids)
                                txc_cpu = cpumask_first(&priv->dpio_cpumask);
                        break;
                default:
                        dev_err(dev, "Unknown FQ type: %d\n", fq->type);
                }
                fq->channel = get_affine_channel(priv, fq->target_cpu);
        }
}

static void setup_fqs(struct dpaa2_eth_priv *priv)
{
        int i;

        /* We have one TxConf FQ per Tx flow.
         * The number of Tx and Rx queues is the same.
         * Tx queues come first in the fq array.
         */
        for (i = 0; i < dpaa2_eth_queue_count(priv); i++) {
                priv->fq[priv->num_fqs].type = DPAA2_TX_CONF_FQ;
                priv->fq[priv->num_fqs].consume = dpaa2_eth_tx_conf;
                priv->fq[priv->num_fqs++].flowid = (u16)i;
        }

        for (i = 0; i < dpaa2_eth_queue_count(priv); i++) {
                priv->fq[priv->num_fqs].type = DPAA2_RX_FQ;
                priv->fq[priv->num_fqs].consume = dpaa2_eth_rx;
                priv->fq[priv->num_fqs++].flowid = (u16)i;
        }

        /* For each FQ, decide on which core to process incoming frames */
        set_fq_affinity(priv);
}

/* Allocate and configure one buffer pool for each interface */
static int setup_dpbp(struct dpaa2_eth_priv *priv)
{
        int err;
        struct fsl_mc_device *dpbp_dev;
        struct device *dev = priv->net_dev->dev.parent;
        struct dpbp_attr dpbp_attrs;

        err = fsl_mc_object_allocate(to_fsl_mc_device(dev), FSL_MC_POOL_DPBP,
                                     &dpbp_dev);
        if (err) {
                dev_err(dev, "DPBP device allocation failed\n");
                return err;
        }

        priv->dpbp_dev = dpbp_dev;

        err = dpbp_open(priv->mc_io, 0, priv->dpbp_dev->obj_desc.id,
                        &dpbp_dev->mc_handle);
        if (err) {
                dev_err(dev, "dpbp_open() failed\n");
                goto err_open;
        }

        err = dpbp_reset(priv->mc_io, 0, dpbp_dev->mc_handle);
        if (err) {
                dev_err(dev, "dpbp_reset() failed\n");
                goto err_reset;
        }

        err = dpbp_enable(priv->mc_io, 0, dpbp_dev->mc_handle);
        if (err) {
                dev_err(dev, "dpbp_enable() failed\n");
                goto err_enable;
        }

        err = dpbp_get_attributes(priv->mc_io, 0, dpbp_dev->mc_handle,
                                  &dpbp_attrs);
        if (err) {
                dev_err(dev, "dpbp_get_attributes() failed\n");
                goto err_get_attr;
        }
        priv->bpid = dpbp_attrs.bpid;

        return 0;

err_get_attr:
        dpbp_disable(priv->mc_io, 0, dpbp_dev->mc_handle);
err_enable:
err_reset:
        dpbp_close(priv->mc_io, 0, dpbp_dev->mc_handle);
err_open:
        fsl_mc_object_free(dpbp_dev);

        return err;
}

static void free_dpbp(struct dpaa2_eth_priv *priv)
{
        drain_pool(priv);
        dpbp_disable(priv->mc_io, 0, priv->dpbp_dev->mc_handle);
        dpbp_close(priv->mc_io, 0, priv->dpbp_dev->mc_handle);
        fsl_mc_object_free(priv->dpbp_dev);
}

/* Configure the DPNI object this interface is associated with */
static int setup_dpni(struct fsl_mc_device *ls_dev)
{
        struct device *dev = &ls_dev->dev;
        struct dpaa2_eth_priv *priv;
        struct net_device *net_dev;
        struct dpni_buffer_layout buf_layout = {0};
        int err;

        net_dev = dev_get_drvdata(dev);
        priv = netdev_priv(net_dev);

        /* get a handle for the DPNI object */
        err = dpni_open(priv->mc_io, 0, ls_dev->obj_desc.id, &priv->mc_token);
        if (err) {
                dev_err(dev, "dpni_open() failed\n");
                goto err_open;
        }

        ls_dev->mc_io = priv->mc_io;
        ls_dev->mc_handle = priv->mc_token;

        err = dpni_reset(priv->mc_io, 0, priv->mc_token);
        if (err) {
                dev_err(dev, "dpni_reset() failed\n");
                goto err_reset;
        }

        err = dpni_get_attributes(priv->mc_io, 0, priv->mc_token,
                                  &priv->dpni_attrs);
        if (err) {
                dev_err(dev, "dpni_get_attributes() failed (err=%d)\n", err);
                goto err_get_attr;
        }

        /* Configure buffer layouts */
        /* rx buffer */
        buf_layout.pass_parser_result = true;
        buf_layout.pass_frame_status = true;
        buf_layout.private_data_size = DPAA2_ETH_SWA_SIZE;
        buf_layout.data_align = DPAA2_ETH_RX_BUF_ALIGN;
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_PARSER_RESULT |
                             DPNI_BUF_LAYOUT_OPT_FRAME_STATUS |
                             DPNI_BUF_LAYOUT_OPT_PRIVATE_DATA_SIZE |
                             DPNI_BUF_LAYOUT_OPT_DATA_ALIGN;
        err = dpni_set_buffer_layout(priv->mc_io, 0, priv->mc_token,
                                     DPNI_QUEUE_RX, &buf_layout);
        if (err) {
                dev_err(dev, "dpni_set_buffer_layout(RX) failed\n");
                goto err_buf_layout;
        }

        /* tx buffer */
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_FRAME_STATUS |
                             DPNI_BUF_LAYOUT_OPT_PRIVATE_DATA_SIZE;
        err = dpni_set_buffer_layout(priv->mc_io, 0, priv->mc_token,
                                     DPNI_QUEUE_TX, &buf_layout);
        if (err) {
                dev_err(dev, "dpni_set_buffer_layout(TX) failed\n");
                goto err_buf_layout;
        }

        /* tx-confirm buffer */
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_FRAME_STATUS;
        err = dpni_set_buffer_layout(priv->mc_io, 0, priv->mc_token,
                                     DPNI_QUEUE_TX_CONFIRM, &buf_layout);
        if (err) {
                dev_err(dev, "dpni_set_buffer_layout(TX_CONF) failed\n");
                goto err_buf_layout;
        }

        /* Now that we've set our tx buffer layout, retrieve the minimum
         * required tx data offset.
         */
        err = dpni_get_tx_data_offset(priv->mc_io, 0, priv->mc_token,
                                      &priv->tx_data_offset);
        if (err) {
                dev_err(dev, "dpni_get_tx_data_offset() failed\n");
                goto err_data_offset;
        }

        if ((priv->tx_data_offset % 64) != 0)
                dev_warn(dev, "Tx data offset (%d) not a multiple of 64B\n",
                         priv->tx_data_offset);

        /* Accommodate software annotation space (SWA) */
        priv->tx_data_offset += DPAA2_ETH_SWA_SIZE;

        return 0;

err_data_offset:
err_buf_layout:
err_get_attr:
err_reset:
        dpni_close(priv->mc_io, 0, priv->mc_token);
err_open:
        return err;
}

static void free_dpni(struct dpaa2_eth_priv *priv)
{
        int err;

        err = dpni_reset(priv->mc_io, 0, priv->mc_token);
        if (err)
                netdev_warn(priv->net_dev, "dpni_reset() failed (err %d)\n",
                            err);

        dpni_close(priv->mc_io, 0, priv->mc_token);
}

static int setup_rx_flow(struct dpaa2_eth_priv *priv,
                         struct dpaa2_eth_fq *fq)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpni_queue queue;
        struct dpni_queue_id qid;
        struct dpni_taildrop td;
        int err;

        err = dpni_get_queue(priv->mc_io, 0, priv->mc_token,
                             DPNI_QUEUE_RX, 0, fq->flowid, &queue, &qid);
        if (err) {
                dev_err(dev, "dpni_get_queue(RX) failed\n");
                return err;
        }

        fq->fqid = qid.fqid;

        queue.destination.id = fq->channel->dpcon_id;
        queue.destination.type = DPNI_DEST_DPCON;
        queue.destination.priority = 1;
        queue.user_context = (u64)fq;
        err = dpni_set_queue(priv->mc_io, 0, priv->mc_token,
                             DPNI_QUEUE_RX, 0, fq->flowid,
                             DPNI_QUEUE_OPT_USER_CTX | DPNI_QUEUE_OPT_DEST,
                             &queue);
        if (err) {
                dev_err(dev, "dpni_set_queue(RX) failed\n");
                return err;
        }

        td.enable = 1;
        td.threshold = DPAA2_ETH_TAILDROP_THRESH;
        err = dpni_set_taildrop(priv->mc_io, 0, priv->mc_token, DPNI_CP_QUEUE,
                                DPNI_QUEUE_RX, 0, fq->flowid, &td);
        if (err) {
                dev_err(dev, "dpni_set_threshold() failed\n");
                return err;
        }

        return 0;
}

static int setup_tx_flow(struct dpaa2_eth_priv *priv,
                         struct dpaa2_eth_fq *fq)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpni_queue queue;
        struct dpni_queue_id qid;
        int err;

        err = dpni_get_queue(priv->mc_io, 0, priv->mc_token,
                             DPNI_QUEUE_TX, 0, fq->flowid, &queue, &qid);
        if (err) {
                dev_err(dev, "dpni_get_queue(TX) failed\n");
                return err;
        }

        fq->tx_qdbin = qid.qdbin;

        err = dpni_get_queue(priv->mc_io, 0, priv->mc_token,
                             DPNI_QUEUE_TX_CONFIRM, 0, fq->flowid,
                             &queue, &qid);
        if (err) {
                dev_err(dev, "dpni_get_queue(TX_CONF) failed\n");
                return err;
        }

        fq->fqid = qid.fqid;

        queue.destination.id = fq->channel->dpcon_id;
        queue.destination.type = DPNI_DEST_DPCON;
        queue.destination.priority = 0;
        queue.user_context = (u64)fq;
        err = dpni_set_queue(priv->mc_io, 0, priv->mc_token,
                             DPNI_QUEUE_TX_CONFIRM, 0, fq->flowid,
                             DPNI_QUEUE_OPT_USER_CTX | DPNI_QUEUE_OPT_DEST,
                             &queue);
        if (err) {
                dev_err(dev, "dpni_set_queue(TX_CONF) failed\n");
                return err;
        }

        return 0;
}

/* Hash key is a 5-tuple: IPsrc, IPdst, IPnextproto, L4src, L4dst */
static const struct dpaa2_eth_hash_fields hash_fields[] = {
        {
                /* IP header */
                .rxnfc_field = RXH_IP_SRC,
                .cls_prot = NET_PROT_IP,
                .cls_field = NH_FLD_IP_SRC,
                .size = 4,
        }, {
                .rxnfc_field = RXH_IP_DST,
                .cls_prot = NET_PROT_IP,
                .cls_field = NH_FLD_IP_DST,
                .size = 4,
        }, {
                .rxnfc_field = RXH_L3_PROTO,
                .cls_prot = NET_PROT_IP,
                .cls_field = NH_FLD_IP_PROTO,
                .size = 1,
        }, {
                /* Using UDP ports, this is functionally equivalent to raw
                 * byte pairs from L4 header.
                 */
                .rxnfc_field = RXH_L4_B_0_1,
                .cls_prot = NET_PROT_UDP,
                .cls_field = NH_FLD_UDP_PORT_SRC,
                .size = 2,
        }, {
                .rxnfc_field = RXH_L4_B_2_3,
                .cls_prot = NET_PROT_UDP,
                .cls_field = NH_FLD_UDP_PORT_DST,
                .size = 2,
        },
};

/* Set RX hash options
 * flags is a combination of RXH_ bits
 */
static int dpaa2_eth_set_hash(struct net_device *net_dev, u64 flags)
{
        struct device *dev = net_dev->dev.parent;
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct dpkg_profile_cfg cls_cfg;
        struct dpni_rx_tc_dist_cfg dist_cfg;
        u8 *dma_mem;
        int i;
        int err = 0;

        if (!dpaa2_eth_hash_enabled(priv)) {
                dev_dbg(dev, "Hashing support is not enabled\n");
                return 0;
        }

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

        for (i = 0; i < ARRAY_SIZE(hash_fields); i++) {
                struct dpkg_extract *key =
                        &cls_cfg.extracts[cls_cfg.num_extracts];

                if (!(flags & hash_fields[i].rxnfc_field))
                        continue;

                if (cls_cfg.num_extracts >= DPKG_MAX_NUM_OF_EXTRACTS) {
                        dev_err(dev, "error adding key extraction rule, too many rules?\n");
                        return -E2BIG;
                }

                key->type = DPKG_EXTRACT_FROM_HDR;
                key->extract.from_hdr.prot = hash_fields[i].cls_prot;
                key->extract.from_hdr.type = DPKG_FULL_FIELD;
                key->extract.from_hdr.field = hash_fields[i].cls_field;
                cls_cfg.num_extracts++;

                priv->rx_hash_fields |= hash_fields[i].rxnfc_field;
        }

        dma_mem = kzalloc(DPAA2_CLASSIFIER_DMA_SIZE, GFP_KERNEL);
        if (!dma_mem)
                return -ENOMEM;

        err = dpni_prepare_key_cfg(&cls_cfg, dma_mem);
        if (err) {
                dev_err(dev, "dpni_prepare_key_cfg error %d\n", err);
                goto err_prep_key;
        }

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

        /* Prepare for setting the rx dist */
        dist_cfg.key_cfg_iova = dma_map_single(dev, dma_mem,
                                               DPAA2_CLASSIFIER_DMA_SIZE,
                                               DMA_TO_DEVICE);
        if (dma_mapping_error(dev, dist_cfg.key_cfg_iova)) {
                dev_err(dev, "DMA mapping failed\n");
                err = -ENOMEM;
                goto err_dma_map;
        }

        dist_cfg.dist_size = dpaa2_eth_queue_count(priv);
        dist_cfg.dist_mode = DPNI_DIST_MODE_HASH;

        err = dpni_set_rx_tc_dist(priv->mc_io, 0, priv->mc_token, 0, &dist_cfg);
        dma_unmap_single(dev, dist_cfg.key_cfg_iova,
                         DPAA2_CLASSIFIER_DMA_SIZE, DMA_TO_DEVICE);
        if (err)
                dev_err(dev, "dpni_set_rx_tc_dist() error %d\n", err);

err_dma_map:
err_prep_key:
        kfree(dma_mem);
        return err;
}

/* Bind the DPNI to its needed objects and resources: buffer pool, DPIOs,
 * frame queues and channels
 */
static int bind_dpni(struct dpaa2_eth_priv *priv)
{
        struct net_device *net_dev = priv->net_dev;
        struct device *dev = net_dev->dev.parent;
        struct dpni_pools_cfg pools_params;
        struct dpni_error_cfg err_cfg;
        int err = 0;
        int i;

        pools_params.num_dpbp = 1;
        pools_params.pools[0].dpbp_id = priv->dpbp_dev->obj_desc.id;
        pools_params.pools[0].backup_pool = 0;
        pools_params.pools[0].buffer_size = DPAA2_ETH_RX_BUF_SIZE;
        err = dpni_set_pools(priv->mc_io, 0, priv->mc_token, &pools_params);
        if (err) {
                dev_err(dev, "dpni_set_pools() failed\n");
                return err;
        }

        /* have the interface implicitly distribute traffic based on supported
         * header fields
         */
        err = dpaa2_eth_set_hash(net_dev, DPAA2_RXH_SUPPORTED);
        if (err)
                netdev_err(net_dev, "Failed to configure hashing\n");

        /* Configure handling of error frames */
        err_cfg.errors = DPAA2_FAS_RX_ERR_MASK;
        err_cfg.set_frame_annotation = 1;
        err_cfg.error_action = DPNI_ERROR_ACTION_DISCARD;
        err = dpni_set_errors_behavior(priv->mc_io, 0, priv->mc_token,
                                       &err_cfg);
        if (err) {
                dev_err(dev, "dpni_set_errors_behavior failed\n");
                return err;
        }

        /* Configure Rx and Tx conf queues to generate CDANs */
        for (i = 0; i < priv->num_fqs; i++) {
                switch (priv->fq[i].type) {
                case DPAA2_RX_FQ:
                        err = setup_rx_flow(priv, &priv->fq[i]);
                        break;
                case DPAA2_TX_CONF_FQ:
                        err = setup_tx_flow(priv, &priv->fq[i]);
                        break;
                default:
                        dev_err(dev, "Invalid FQ type %d\n", priv->fq[i].type);
                        return -EINVAL;
                }
                if (err)
                        return err;
        }

        err = dpni_get_qdid(priv->mc_io, 0, priv->mc_token,
                            DPNI_QUEUE_TX, &priv->tx_qdid);
        if (err) {
                dev_err(dev, "dpni_get_qdid() failed\n");
                return err;
        }

        return 0;
}

/* Allocate rings for storing incoming frame descriptors */
static int alloc_rings(struct dpaa2_eth_priv *priv)
{
        struct net_device *net_dev = priv->net_dev;
        struct device *dev = net_dev->dev.parent;
        int i;

        for (i = 0; i < priv->num_channels; i++) {
                priv->channel[i]->store =
                        dpaa2_io_store_create(DPAA2_ETH_STORE_SIZE, dev);
                if (!priv->channel[i]->store) {
                        netdev_err(net_dev, "dpaa2_io_store_create() failed\n");
                        goto err_ring;
                }
        }

        return 0;

err_ring:
        for (i = 0; i < priv->num_channels; i++) {
                if (!priv->channel[i]->store)
                        break;
                dpaa2_io_store_destroy(priv->channel[i]->store);
        }

        return -ENOMEM;
}

static void free_rings(struct dpaa2_eth_priv *priv)
{
        int i;

        for (i = 0; i < priv->num_channels; i++)
                dpaa2_io_store_destroy(priv->channel[i]->store);
}

static int set_mac_addr(struct dpaa2_eth_priv *priv)
{
        struct net_device *net_dev = priv->net_dev;
        struct device *dev = net_dev->dev.parent;
        u8 mac_addr[ETH_ALEN], dpni_mac_addr[ETH_ALEN];
        int err;

        /* Get firmware address, if any */
        err = dpni_get_port_mac_addr(priv->mc_io, 0, priv->mc_token, mac_addr);
        if (err) {
                dev_err(dev, "dpni_get_port_mac_addr() failed\n");
                return err;
        }

        /* Get DPNI attributes address, if any */
        err = dpni_get_primary_mac_addr(priv->mc_io, 0, priv->mc_token,
                                        dpni_mac_addr);
        if (err) {
                dev_err(dev, "dpni_get_primary_mac_addr() failed\n");
                return err;
        }

        /* First check if firmware has any address configured by bootloader */
        if (!is_zero_ether_addr(mac_addr)) {
                /* If the DPMAC addr != DPNI addr, update it */
                if (!ether_addr_equal(mac_addr, dpni_mac_addr)) {
                        err = dpni_set_primary_mac_addr(priv->mc_io, 0,
                                                        priv->mc_token,
                                                        mac_addr);
                        if (err) {
                                dev_err(dev, "dpni_set_primary_mac_addr() failed\n");
                                return err;
                        }
                }
                memcpy(net_dev->dev_addr, mac_addr, net_dev->addr_len);
        } else if (is_zero_ether_addr(dpni_mac_addr)) {
                /* No MAC address configured, fill in net_dev->dev_addr
                 * with a random one
                 */
                eth_hw_addr_random(net_dev);
                dev_dbg_once(dev, "device(s) have all-zero hwaddr, replaced with random\n");

                err = dpni_set_primary_mac_addr(priv->mc_io, 0, priv->mc_token,
                                                net_dev->dev_addr);
                if (err) {
                        dev_err(dev, "dpni_set_primary_mac_addr() failed\n");
                        return err;
                }

                /* Override NET_ADDR_RANDOM set by eth_hw_addr_random(); for all
                 * practical purposes, this will be our "permanent" mac address,
                 * at least until the next reboot. This move will also permit
                 * register_netdevice() to properly fill up net_dev->perm_addr.
                 */
                net_dev->addr_assign_type = NET_ADDR_PERM;
        } else {
                /* NET_ADDR_PERM is default, all we have to do is
                 * fill in the device addr.
                 */
                memcpy(net_dev->dev_addr, dpni_mac_addr, net_dev->addr_len);
        }

        return 0;
}

static int netdev_init(struct net_device *net_dev)
{
        struct device *dev = net_dev->dev.parent;
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        u8 bcast_addr[ETH_ALEN];
        u8 num_queues;
        int err;

        net_dev->netdev_ops = &dpaa2_eth_ops;

        err = set_mac_addr(priv);
        if (err)
                return err;

        /* Explicitly add the broadcast address to the MAC filtering table */
        eth_broadcast_addr(bcast_addr);
        err = dpni_add_mac_addr(priv->mc_io, 0, priv->mc_token, bcast_addr);
        if (err) {
                dev_err(dev, "dpni_add_mac_addr() failed\n");
                return err;
        }

        /* Reserve enough space to align buffer as per hardware requirement;
         * NOTE: priv->tx_data_offset MUST be initialized at this point.
         */
        net_dev->needed_headroom = DPAA2_ETH_NEEDED_HEADROOM(priv);

        /* Set MTU limits */
        net_dev->min_mtu = 68;
        net_dev->max_mtu = DPAA2_ETH_MAX_MTU;

        /* Set actual number of queues in the net device */
        num_queues = dpaa2_eth_queue_count(priv);
        err = netif_set_real_num_tx_queues(net_dev, num_queues);
        if (err) {
                dev_err(dev, "netif_set_real_num_tx_queues() failed\n");
                return err;
        }
        err = netif_set_real_num_rx_queues(net_dev, num_queues);
        if (err) {
                dev_err(dev, "netif_set_real_num_rx_queues() failed\n");
                return err;
        }

        /* Our .ndo_init will be called herein */
        err = register_netdev(net_dev);
        if (err < 0) {
                dev_err(dev, "register_netdev() failed\n");
                return err;
        }

        return 0;
}

static int poll_link_state(void *arg)
{
        struct dpaa2_eth_priv *priv = (struct dpaa2_eth_priv *)arg;
        int err;

        while (!kthread_should_stop()) {
                err = link_state_update(priv);
                if (unlikely(err))
                        return err;

                msleep(DPAA2_ETH_LINK_STATE_REFRESH);
        }

        return 0;
}

static irqreturn_t dpni_irq0_handler(int irq_num, void *arg)
{
        return IRQ_WAKE_THREAD;
}

static irqreturn_t dpni_irq0_handler_thread(int irq_num, void *arg)
{
        u32 status = 0, clear = 0;
        struct device *dev = (struct device *)arg;
        struct fsl_mc_device *dpni_dev = to_fsl_mc_device(dev);
        struct net_device *net_dev = dev_get_drvdata(dev);
        int err;

        err = dpni_get_irq_status(dpni_dev->mc_io, 0, dpni_dev->mc_handle,
                                  DPNI_IRQ_INDEX, &status);
        if (unlikely(err)) {
                netdev_err(net_dev, "Can't get irq status (err %d)\n", err);
                clear = 0xffffffff;
                goto out;
        }

        if (status & DPNI_IRQ_EVENT_LINK_CHANGED) {
                clear |= DPNI_IRQ_EVENT_LINK_CHANGED;
                link_state_update(netdev_priv(net_dev));
        }

out:
        dpni_clear_irq_status(dpni_dev->mc_io, 0, dpni_dev->mc_handle,
                              DPNI_IRQ_INDEX, clear);
        return IRQ_HANDLED;
}

static int setup_irqs(struct fsl_mc_device *ls_dev)
{
        int err = 0;
        struct fsl_mc_device_irq *irq;

        err = fsl_mc_allocate_irqs(ls_dev);
        if (err) {
                dev_err(&ls_dev->dev, "MC irqs allocation failed\n");
                return err;
        }

        irq = ls_dev->irqs[0];
        err = devm_request_threaded_irq(&ls_dev->dev, irq->msi_desc->irq,
                                        dpni_irq0_handler,
                                        dpni_irq0_handler_thread,
                                        IRQF_NO_SUSPEND | IRQF_ONESHOT,
                                        dev_name(&ls_dev->dev), &ls_dev->dev);
        if (err < 0) {
                dev_err(&ls_dev->dev, "devm_request_threaded_irq(): %d\n", err);
                goto free_mc_irq;
        }

        err = dpni_set_irq_mask(ls_dev->mc_io, 0, ls_dev->mc_handle,
                                DPNI_IRQ_INDEX, DPNI_IRQ_EVENT_LINK_CHANGED);
        if (err < 0) {
                dev_err(&ls_dev->dev, "dpni_set_irq_mask(): %d\n", err);
                goto free_irq;
        }

        err = dpni_set_irq_enable(ls_dev->mc_io, 0, ls_dev->mc_handle,
                                  DPNI_IRQ_INDEX, 1);
        if (err < 0) {
                dev_err(&ls_dev->dev, "dpni_set_irq_enable(): %d\n", err);
                goto free_irq;
        }

        return 0;

free_irq:
        devm_free_irq(&ls_dev->dev, irq->msi_desc->irq, &ls_dev->dev);
free_mc_irq:
        fsl_mc_free_irqs(ls_dev);

        return err;
}

static void add_ch_napi(struct dpaa2_eth_priv *priv)
{
        int i;
        struct dpaa2_eth_channel *ch;

        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                /* NAPI weight *MUST* be a multiple of DPAA2_ETH_STORE_SIZE */
                netif_napi_add(priv->net_dev, &ch->napi, dpaa2_eth_poll,
                               NAPI_POLL_WEIGHT);
        }
}

static void del_ch_napi(struct dpaa2_eth_priv *priv)
{
        int i;
        struct dpaa2_eth_channel *ch;

        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                netif_napi_del(&ch->napi);
        }
}

static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
{
        struct device *dev;
        struct net_device *net_dev = NULL;
        struct dpaa2_eth_priv *priv = NULL;
        int err = 0;

        dev = &dpni_dev->dev;

        /* Net device */
        net_dev = alloc_etherdev_mq(sizeof(*priv), DPAA2_ETH_MAX_TX_QUEUES);
        if (!net_dev) {
                dev_err(dev, "alloc_etherdev_mq() failed\n");
                return -ENOMEM;
        }

        SET_NETDEV_DEV(net_dev, dev);
        dev_set_drvdata(dev, net_dev);

        priv = netdev_priv(net_dev);
        priv->net_dev = net_dev;

        priv->iommu_domain = iommu_get_domain_for_dev(dev);

        /* Obtain a MC portal */
        err = fsl_mc_portal_allocate(dpni_dev, FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
                                     &priv->mc_io);
        if (err) {
                dev_err(dev, "MC portal allocation failed\n");
                goto err_portal_alloc;
        }

        /* MC objects initialization and configuration */
        err = setup_dpni(dpni_dev);
        if (err)
                goto err_dpni_setup;

        err = setup_dpio(priv);
        if (err)
                goto err_dpio_setup;

        setup_fqs(priv);

        err = setup_dpbp(priv);
        if (err)
                goto err_dpbp_setup;

        err = bind_dpni(priv);
        if (err)
                goto err_bind;

        /* Add a NAPI context for each channel */
        add_ch_napi(priv);

        /* Percpu statistics */
        priv->percpu_stats = alloc_percpu(*priv->percpu_stats);
        if (!priv->percpu_stats) {
                dev_err(dev, "alloc_percpu(percpu_stats) failed\n");
                err = -ENOMEM;
                goto err_alloc_percpu_stats;
        }
        priv->percpu_extras = alloc_percpu(*priv->percpu_extras);
        if (!priv->percpu_extras) {
                dev_err(dev, "alloc_percpu(percpu_extras) failed\n");
                err = -ENOMEM;
                goto err_alloc_percpu_extras;
        }

        err = netdev_init(net_dev);
        if (err)
                goto err_netdev_init;

        /* Configure checksum offload based on current interface flags */
        err = set_rx_csum(priv, !!(net_dev->features & NETIF_F_RXCSUM));
        if (err)
                goto err_csum;

        err = set_tx_csum(priv, !!(net_dev->features &
                                   (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)));
        if (err)
                goto err_csum;

        err = alloc_rings(priv);
        if (err)
                goto err_alloc_rings;

        net_dev->ethtool_ops = &dpaa2_ethtool_ops;

        err = setup_irqs(dpni_dev);
        if (err) {
                netdev_warn(net_dev, "Failed to set link interrupt, fall back to polling\n");
                priv->poll_thread = kthread_run(poll_link_state, priv,
                                                "%s_poll_link", net_dev->name);
                if (IS_ERR(priv->poll_thread)) {
                        netdev_err(net_dev, "Error starting polling thread\n");
                        goto err_poll_thread;
                }
                priv->do_link_poll = true;
        }

        dev_info(dev, "Probed interface %s\n", net_dev->name);
        return 0;

err_poll_thread:
        free_rings(priv);
err_alloc_rings:
err_csum:
        unregister_netdev(net_dev);
err_netdev_init:
        free_percpu(priv->percpu_extras);
err_alloc_percpu_extras:
        free_percpu(priv->percpu_stats);
err_alloc_percpu_stats:
        del_ch_napi(priv);
err_bind:
        free_dpbp(priv);
err_dpbp_setup:
        free_dpio(priv);
err_dpio_setup:
        free_dpni(priv);
err_dpni_setup:
        fsl_mc_portal_free(priv->mc_io);
err_portal_alloc:
        dev_set_drvdata(dev, NULL);
        free_netdev(net_dev);

        return err;
}

static int dpaa2_eth_remove(struct fsl_mc_device *ls_dev)
{
        struct device *dev;
        struct net_device *net_dev;
        struct dpaa2_eth_priv *priv;

        dev = &ls_dev->dev;
        net_dev = dev_get_drvdata(dev);
        priv = netdev_priv(net_dev);

        unregister_netdev(net_dev);
        dev_info(net_dev->dev.parent, "Removed interface %s\n", net_dev->name);

        if (priv->do_link_poll)
                kthread_stop(priv->poll_thread);
        else
                fsl_mc_free_irqs(ls_dev);

        free_rings(priv);
        free_percpu(priv->percpu_stats);
        free_percpu(priv->percpu_extras);

        del_ch_napi(priv);
        free_dpbp(priv);
        free_dpio(priv);
        free_dpni(priv);

        fsl_mc_portal_free(priv->mc_io);

        dev_set_drvdata(dev, NULL);
        free_netdev(net_dev);

        return 0;
}

static const struct fsl_mc_device_id dpaa2_eth_match_id_table[] = {
        {
                .vendor = FSL_MC_VENDOR_FREESCALE,
                .obj_type = "dpni",
        },
        { .vendor = 0x0 }
};
MODULE_DEVICE_TABLE(fslmc, dpaa2_eth_match_id_table);

static struct fsl_mc_driver dpaa2_eth_driver = {
        .driver = {
                .name = KBUILD_MODNAME,
                .owner = THIS_MODULE,
        },
        .probe = dpaa2_eth_probe,
        .remove = dpaa2_eth_remove,
        .match_id_table = dpaa2_eth_match_id_table
};

module_fsl_mc_driver(dpaa2_eth_driver);