// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/* Copyright 2014-2016 Freescale Semiconductor Inc.
 * Copyright 2016-2017 NXP
 */
#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 <linux/net_tstamp.h>
#include <linux/fsl/mc.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <net/sock.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");

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
         * except the first one, which was taken care of already
         */
        sgt = vaddr + dpaa2_fd_get_offset(fd);
        for (i = 1; 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_page(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
                               DMA_BIDIRECTIONAL);

                free_pages((unsigned long)sg_vaddr, 0);
                if (dpaa2_sg_is_final(&sgt[i]))
                        break;
        }

free_buf:
        free_pages((unsigned long)vaddr, 0);
}

/* Build a linear skb based on a single-buffer frame descriptor */
static struct sk_buff *build_linear_skb(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);

        ch->buf_count--;

        skb = build_skb(fd_vaddr, DPAA2_ETH_RX_BUF_RAW_SIZE);
        if (unlikely(!skb))
                return NULL;

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

        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_page(dev, sg_addr, DPAA2_ETH_RX_BUF_SIZE,
                               DMA_BIDIRECTIONAL);

                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_RAW_SIZE);
                        if (unlikely(!skb)) {
                                /* Free the first SG entry now, since we already
                                 * unmapped it and obtained the virtual address
                                 */
                                free_pages((unsigned long)sg_vaddr, 0);

                                /* We still need to subtract the buffers used
                                 * by this FD from our software counter
                                 */
                                while (!dpaa2_sg_is_final(&sgt[i]) &&
                                       i < DPAA2_ETH_MAX_SG_ENTRIES)
                                        i++;
                                break;
                        }

                        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;
        }

        WARN_ONCE(i == DPAA2_ETH_MAX_SG_ENTRIES, "Final bit not set in SGT");

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

        return skb;
}

/* Free buffers acquired from the buffer pool or which were meant to
 * be released in the pool
 */
static void free_bufs(struct dpaa2_eth_priv *priv, u64 *buf_array, int count)
{
        struct device *dev = priv->net_dev->dev.parent;
        void *vaddr;
        int i;

        for (i = 0; i < count; i++) {
                vaddr = dpaa2_iova_to_virt(priv->iommu_domain, buf_array[i]);
                dma_unmap_page(dev, buf_array[i], DPAA2_ETH_RX_BUF_SIZE,
                               DMA_BIDIRECTIONAL);
                free_pages((unsigned long)vaddr, 0);
        }
}

static void xdp_release_buf(struct dpaa2_eth_priv *priv,
                            struct dpaa2_eth_channel *ch,
                            dma_addr_t addr)
{
        int err;

        ch->xdp.drop_bufs[ch->xdp.drop_cnt++] = addr;
        if (ch->xdp.drop_cnt < DPAA2_ETH_BUFS_PER_CMD)
                return;

        while ((err = dpaa2_io_service_release(ch->dpio, priv->bpid,
                                               ch->xdp.drop_bufs,
                                               ch->xdp.drop_cnt)) == -EBUSY)
                cpu_relax();

        if (err) {
                free_bufs(priv, ch->xdp.drop_bufs, ch->xdp.drop_cnt);
                ch->buf_count -= ch->xdp.drop_cnt;
        }

        ch->xdp.drop_cnt = 0;
}

static int xdp_enqueue(struct dpaa2_eth_priv *priv, struct dpaa2_fd *fd,
                       void *buf_start, u16 queue_id)
{
        struct dpaa2_eth_fq *fq;
        struct dpaa2_faead *faead;
        u32 ctrl, frc;
        int i, err;

        /* Mark the egress frame hardware annotation area as valid */
        frc = dpaa2_fd_get_frc(fd);
        dpaa2_fd_set_frc(fd, frc | DPAA2_FD_FRC_FAEADV);
        dpaa2_fd_set_ctrl(fd, DPAA2_FD_CTRL_ASAL);

        /* Instruct hardware to release the FD buffer directly into
         * the buffer pool once transmission is completed, instead of
         * sending a Tx confirmation frame to us
         */
        ctrl = DPAA2_FAEAD_A4V | DPAA2_FAEAD_A2V | DPAA2_FAEAD_EBDDV;
        faead = dpaa2_get_faead(buf_start, false);
        faead->ctrl = cpu_to_le32(ctrl);
        faead->conf_fqid = 0;

        fq = &priv->fq[queue_id];
        for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
                err = priv->enqueue(priv, fq, fd, 0);
                if (err != -EBUSY)
                        break;
        }

        return err;
}

static u32 run_xdp(struct dpaa2_eth_priv *priv,
                   struct dpaa2_eth_channel *ch,
                   struct dpaa2_eth_fq *rx_fq,
                   struct dpaa2_fd *fd, void *vaddr)
{
        dma_addr_t addr = dpaa2_fd_get_addr(fd);
        struct rtnl_link_stats64 *percpu_stats;
        struct bpf_prog *xdp_prog;
        struct xdp_buff xdp;
        u32 xdp_act = XDP_PASS;
        int err;

        percpu_stats = this_cpu_ptr(priv->percpu_stats);

        rcu_read_lock();

        xdp_prog = READ_ONCE(ch->xdp.prog);
        if (!xdp_prog)
                goto out;

        xdp.data = vaddr + dpaa2_fd_get_offset(fd);
        xdp.data_end = xdp.data + dpaa2_fd_get_len(fd);
        xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
        xdp_set_data_meta_invalid(&xdp);
        xdp.rxq = &ch->xdp_rxq;

        xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp);

        /* xdp.data pointer may have changed */
        dpaa2_fd_set_offset(fd, xdp.data - vaddr);
        dpaa2_fd_set_len(fd, xdp.data_end - xdp.data);

        switch (xdp_act) {
        case XDP_PASS:
                break;
        case XDP_TX:
                err = xdp_enqueue(priv, fd, vaddr, rx_fq->flowid);
                if (err) {
                        xdp_release_buf(priv, ch, addr);
                        percpu_stats->tx_errors++;
                        ch->stats.xdp_tx_err++;
                } else {
                        percpu_stats->tx_packets++;
                        percpu_stats->tx_bytes += dpaa2_fd_get_len(fd);
                        ch->stats.xdp_tx++;
                }
                break;
        default:
                bpf_warn_invalid_xdp_action(xdp_act);
                /* fall through */
        case XDP_ABORTED:
                trace_xdp_exception(priv->net_dev, xdp_prog, xdp_act);
                /* fall through */
        case XDP_DROP:
                xdp_release_buf(priv, ch, addr);
                ch->stats.xdp_drop++;
                break;
        case XDP_REDIRECT:
                dma_unmap_page(priv->net_dev->dev.parent, addr,
                               DPAA2_ETH_RX_BUF_SIZE, DMA_BIDIRECTIONAL);
                ch->buf_count--;
                xdp.data_hard_start = vaddr;
                err = xdp_do_redirect(priv->net_dev, &xdp, xdp_prog);
                if (unlikely(err))
                        ch->stats.xdp_drop++;
                else
                        ch->stats.xdp_redirect++;
                break;
        }

        ch->xdp.res |= xdp_act;
out:
        rcu_read_unlock();
        return xdp_act;
}

/* 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 dpaa2_eth_fq *fq)
{
        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;
        u32 xdp_act;

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

        vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr);
        dma_sync_single_for_cpu(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
                                DMA_BIDIRECTIONAL);

        fas = dpaa2_get_fas(vaddr, false);
        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) {
                xdp_act = run_xdp(priv, ch, fq, (struct dpaa2_fd *)fd, vaddr);
                if (xdp_act != XDP_PASS) {
                        percpu_stats->rx_packets++;
                        percpu_stats->rx_bytes += dpaa2_fd_get_len(fd);
                        return;
                }

                dma_unmap_page(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
                               DMA_BIDIRECTIONAL);
                skb = build_linear_skb(ch, fd, vaddr);
        } else if (fd_format == dpaa2_fd_sg) {
                WARN_ON(priv->xdp_prog);

                dma_unmap_page(dev, addr, DPAA2_ETH_RX_BUF_SIZE,
                               DMA_BIDIRECTIONAL);
                skb = build_frag_skb(priv, ch, buf_data);
                free_pages((unsigned long)vaddr, 0);
                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);

        /* Get the timestamp value */
        if (priv->rx_tstamp) {
                struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
                __le64 *ts = dpaa2_get_ts(vaddr, false);
                u64 ns;

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

                ns = DPAA2_PTP_CLK_PERIOD_NS * le64_to_cpup(ts);
                shhwtstamps->hwtstamp = ns_to_ktime(ns);
        }

        /* 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);
        skb_record_rx_queue(skb, fq->flowid);

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

        list_add_tail(&skb->list, ch->rx_list);

        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_fq **src)
{
        struct dpaa2_eth_priv *priv = ch->priv;
        struct dpaa2_eth_fq *fq = NULL;
        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 *)(uintptr_t)dpaa2_dq_fqd_ctx(dq);

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

        if (!cleaned)
                return 0;

        fq->stats.frames += cleaned;

        /* A dequeue operation only pulls frames from a single queue
         * into the store. Return the frame queue as an out param.
         */
        if (src)
                *src = fq;

        return cleaned;
}

/* Configure the egress frame annotation for timestamp update */
static void enable_tx_tstamp(struct dpaa2_fd *fd, void *buf_start)
{
        struct dpaa2_faead *faead;
        u32 ctrl, frc;

        /* Mark the egress frame annotation area as valid */
        frc = dpaa2_fd_get_frc(fd);
        dpaa2_fd_set_frc(fd, frc | DPAA2_FD_FRC_FAEADV);

        /* Set hardware annotation size */
        ctrl = dpaa2_fd_get_ctrl(fd);
        dpaa2_fd_set_ctrl(fd, ctrl | DPAA2_FD_CTRL_ASAL);

        /* enable UPD (update prepanded data) bit in FAEAD field of
         * hardware frame annotation area
         */
        ctrl = DPAA2_FAEAD_A2V | DPAA2_FAEAD_UPDV | DPAA2_FAEAD_UPD;
        faead = dpaa2_get_faead(buf_start, true);
        faead->ctrl = cpu_to_le32(ctrl);
}

/* 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;

        /* 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) *  num_dma_bufs;
        sgt_buf = napi_alloc_frag(sgt_buf_size + DPAA2_ETH_TX_BUF_ALIGN);
        if (unlikely(!sgt_buf)) {
                err = -ENOMEM;
                goto sgt_buf_alloc_failed;
        }
        sgt_buf = PTR_ALIGN(sgt_buf, DPAA2_ETH_TX_BUF_ALIGN);
        memset(sgt_buf, 0, sgt_buf_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->type = DPAA2_ETH_SWA_SG;
        swa->sg.skb = skb;
        swa->sg.scl = scl;
        swa->sg.num_sg = num_sg;
        swa->sg.sgt_size = sgt_buf_size;

        /* 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, FD_CTRL_PTA);

        if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
                enable_tx_tstamp(fd, sgt_buf);

        return 0;

dma_map_single_failed:
        skb_free_frag(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, *aligned_start;
        struct dpaa2_eth_swa *swa;
        dma_addr_t addr;

        buffer_start = skb->data - dpaa2_eth_needed_headroom(priv, skb);

        /* If there's enough room to align the FD address, do it.
         * It will help hardware optimize accesses.
         */
        aligned_start = PTR_ALIGN(buffer_start - DPAA2_ETH_TX_BUF_ALIGN,
                                  DPAA2_ETH_TX_BUF_ALIGN);
        if (aligned_start >= skb->head)
                buffer_start = aligned_start;

        /* 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
         */
        swa = (struct dpaa2_eth_swa *)buffer_start;
        swa->type = DPAA2_ETH_SWA_SINGLE;
        swa->single.skb = 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, FD_CTRL_PTA);

        if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)
                enable_tx_tstamp(fd, buffer_start);

        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().
 */
static void free_tx_fd(const struct dpaa2_eth_priv *priv,
                       struct dpaa2_eth_fq *fq,
                       const struct dpaa2_fd *fd, bool in_napi)
{
        struct device *dev = priv->net_dev->dev.parent;
        dma_addr_t fd_addr;
        struct sk_buff *skb = NULL;
        unsigned char *buffer_start;
        struct dpaa2_eth_swa *swa;
        u8 fd_format = dpaa2_fd_get_format(fd);
        u32 fd_len = dpaa2_fd_get_len(fd);

        fd_addr = dpaa2_fd_get_addr(fd);
        buffer_start = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
        swa = (struct dpaa2_eth_swa *)buffer_start;

        if (fd_format == dpaa2_fd_single) {
                if (swa->type == DPAA2_ETH_SWA_SINGLE) {
                        skb = swa->single.skb;
                        /* 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 {
                        WARN_ONCE(swa->type != DPAA2_ETH_SWA_XDP, "Wrong SWA type");
                        dma_unmap_single(dev, fd_addr, swa->xdp.dma_size,
                                         DMA_BIDIRECTIONAL);
                }
        } else if (fd_format == dpaa2_fd_sg) {
                skb = swa->sg.skb;

                /* Unmap the scatterlist */
                dma_unmap_sg(dev, swa->sg.scl, swa->sg.num_sg,
                             DMA_BIDIRECTIONAL);
                kfree(swa->sg.scl);

                /* Unmap the SGT buffer */
                dma_unmap_single(dev, fd_addr, swa->sg.sgt_size,
                                 DMA_BIDIRECTIONAL);
        } else {
                netdev_dbg(priv->net_dev, "Invalid FD format\n");
                return;
        }

        if (swa->type != DPAA2_ETH_SWA_XDP && in_napi) {
                fq->dq_frames++;
                fq->dq_bytes += fd_len;
        }

        if (swa->type == DPAA2_ETH_SWA_XDP) {
                xdp_return_frame(swa->xdp.xdpf);
                return;
        }

        /* Get the timestamp value */
        if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
                struct skb_shared_hwtstamps shhwtstamps;
                __le64 *ts = dpaa2_get_ts(buffer_start, true);
                u64 ns;

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

                ns = DPAA2_PTP_CLK_PERIOD_NS * le64_to_cpup(ts);
                shhwtstamps.hwtstamp = ns_to_ktime(ns);
                skb_tstamp_tx(skb, &shhwtstamps);
        }

        /* Free SGT buffer allocated on tx */
        if (fd_format != dpaa2_fd_single)
                skb_free_frag(buffer_start);

        /* Move on with skb release */
        napi_consume_skb(skb, in_napi);
}

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;
        struct netdev_queue *nq;
        u16 queue_mapping;
        unsigned int needed_headroom;
        u32 fd_len;
        u8 prio = 0;
        int err, i;

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

        needed_headroom = dpaa2_eth_needed_headroom(priv, skb);
        if (skb_headroom(skb) < needed_headroom) {
                struct sk_buff *ns;

                ns = skb_realloc_headroom(skb, needed_headroom);
                if (unlikely(!ns)) {
                        percpu_stats->tx_dropped++;
                        goto err_alloc_headroom;
                }
                percpu_extras->tx_reallocs++;

                if (skb->sk)
                        skb_set_owner_w(ns, skb->sk);

                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 relies on queue id from the stack.
         * In case of a forwarded frame from another DPNI interface, we choose
         * a queue affined to the same core that processed the Rx frame
         */
        queue_mapping = skb_get_queue_mapping(skb);

        if (net_dev->num_tc) {
                prio = netdev_txq_to_tc(net_dev, queue_mapping);
                /* Hardware interprets priority level 0 as being the highest,
                 * so we need to do a reverse mapping to the netdev tc index
                 */
                prio = net_dev->num_tc - prio - 1;
                /* We have only one FQ array entry for all Tx hardware queues
                 * with the same flow id (but different priority levels)
                 */
                queue_mapping %= dpaa2_eth_queue_count(priv);
        }
        fq = &priv->fq[queue_mapping];

        fd_len = dpaa2_fd_get_len(&fd);
        nq = netdev_get_tx_queue(net_dev, queue_mapping);
        netdev_tx_sent_queue(nq, fd_len);

        /* Everything that happens after this enqueues might race with
         * the Tx confirmation callback for this frame
         */
        for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
                err = priv->enqueue(priv, fq, &fd, prio);
                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, fq, &fd, false);
                netdev_tx_completed_queue(nq, 1, fd_len);
        } else {
                percpu_stats->tx_packets++;
                percpu_stats->tx_bytes += fd_len;
        }

        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 __always_unused,
                              const struct dpaa2_fd *fd,
                              struct dpaa2_eth_fq *fq)
{
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa2_eth_drv_stats *percpu_extras;
        u32 fd_len = dpaa2_fd_get_len(fd);
        u32 fd_errors;

        /* 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 += fd_len;

        /* Check frame errors in the FD field */
        fd_errors = dpaa2_fd_get_ctrl(fd) & DPAA2_FD_TX_ERR_MASK;
        free_tx_fd(priv, fq, fd, true);

        if (likely(!fd_errors))
                return;

        if (net_ratelimit())
                netdev_dbg(priv->net_dev, "TX frame FD error: 0x%08x\n",
                           fd_errors);

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

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,
                    struct dpaa2_eth_channel *ch, u16 bpid)
{
        struct device *dev = priv->net_dev->dev.parent;
        u64 buf_array[DPAA2_ETH_BUFS_PER_CMD];
        struct page *page;
        dma_addr_t addr;
        int i, err;

        for (i = 0; i < DPAA2_ETH_BUFS_PER_CMD; i++) {
                /* Allocate buffer visible to WRIOP + skb shared info +
                 * alignment padding
                 */
                /* allocate one page for each Rx buffer. WRIOP sees
                 * the entire page except for a tailroom reserved for
                 * skb shared info
                 */
                page = dev_alloc_pages(0);
                if (!page)
                        goto err_alloc;

                addr = dma_map_page(dev, page, 0, DPAA2_ETH_RX_BUF_SIZE,
                                    DMA_BIDIRECTIONAL);
                if (unlikely(dma_mapping_error(dev, addr)))
                        goto err_map;

                buf_array[i] = addr;

                /* tracing point */
                trace_dpaa2_eth_buf_seed(priv->net_dev,
                                         page, DPAA2_ETH_RX_BUF_RAW_SIZE,
                                         addr, DPAA2_ETH_RX_BUF_SIZE,
                                         bpid);
        }

release_bufs:
        /* In case the portal is busy, retry until successful */
        while ((err = dpaa2_io_service_release(ch->dpio, bpid,
                                               buf_array, i)) == -EBUSY)
                cpu_relax();

        /* If release command failed, clean up and bail out;
         * not much else we can do about it
         */
        if (err) {
                free_bufs(priv, buf_array, i);
                return 0;
        }

        return i;

err_map:
        __free_pages(page, 0);
err_alloc:
        /* If we managed to allocate at least some buffers,
         * release them to hardware

         */
        if (i)
                goto release_bufs;

        return 0;
}

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

        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, priv->channel[j], bpid);
                        priv->channel[j]->buf_count += new_count;

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

        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)
{
        u64 buf_array[DPAA2_ETH_BUFS_PER_CMD];
        int ret;

        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;
                }
                free_bufs(priv, buf_array, ret);
        } 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, ch, 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(ch->dpio, 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;
        struct dpaa2_eth_priv *priv;
        int rx_cleaned = 0, txconf_cleaned = 0;
        struct dpaa2_eth_fq *fq, *txc_fq = NULL;
        struct netdev_queue *nq;
        int store_cleaned, work_done;
        struct list_head rx_list;
        int err;

        ch = container_of(napi, struct dpaa2_eth_channel, napi);
        ch->xdp.res = 0;
        priv = ch->priv;

        INIT_LIST_HEAD(&rx_list);
        ch->rx_list = &rx_list;

        do {
                err = pull_channel(ch);
                if (unlikely(err))
                        break;

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

                store_cleaned = consume_frames(ch, &fq);
                if (!store_cleaned)
                        break;
                if (fq->type == DPAA2_RX_FQ) {
                        rx_cleaned += store_cleaned;
                } else {
                        txconf_cleaned += store_cleaned;
                        /* We have a single Tx conf FQ on this channel */
                        txc_fq = fq;
                }

                /* If we either consumed the whole NAPI budget with Rx frames
                 * or we reached the Tx confirmations threshold, we're done.
                 */
                if (rx_cleaned >= budget ||
                    txconf_cleaned >= DPAA2_ETH_TXCONF_PER_NAPI) {
                        work_done = budget;
                        goto out;
                }
        } while (store_cleaned);

        /* We didn't consume the entire budget, so finish napi and
         * re-enable data availability notifications
         */
        napi_complete_done(napi, rx_cleaned);
        do {
                err = dpaa2_io_service_rearm(ch->dpio, &ch->nctx);
                cpu_relax();
        } while (err == -EBUSY);
        WARN_ONCE(err, "CDAN notifications rearm failed on core %d",
                  ch->nctx.desired_cpu);

        work_done = max(rx_cleaned, 1);

out:
        netif_receive_skb_list(ch->rx_list);

        if (txc_fq && txc_fq->dq_frames) {
                nq = netdev_get_tx_queue(priv->net_dev, txc_fq->flowid);
                netdev_tx_completed_queue(nq, txc_fq->dq_frames,
                                          txc_fq->dq_bytes);
                txc_fq->dq_frames = 0;
                txc_fq->dq_bytes = 0;
        }

        if (ch->xdp.res & XDP_REDIRECT)
                xdp_do_flush_map();

        return work_done;
}

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 = {0};
        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;
}

/* Total number of in-flight frames on ingress queues */
static u32 ingress_fq_count(struct dpaa2_eth_priv *priv)
{
        struct dpaa2_eth_fq *fq;
        u32 fcnt = 0, bcnt = 0, total = 0;
        int i, err;

        for (i = 0; i < priv->num_fqs; i++) {
                fq = &priv->fq[i];
                err = dpaa2_io_query_fq_count(NULL, fq->fqid, &fcnt, &bcnt);
                if (err) {
                        netdev_warn(priv->net_dev, "query_fq_count failed");
                        break;
                }
                total += fcnt;
        }

        return total;
}

static void wait_for_fq_empty(struct dpaa2_eth_priv *priv)
{
        int retries = 10;
        u32 pending;

        do {
                pending = ingress_fq_count(priv);
                if (pending)
                        msleep(100);
        } while (pending && --retries);
}

static int dpaa2_eth_stop(struct net_device *net_dev)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        int dpni_enabled = 0;
        int retries = 10;

        netif_tx_stop_all_queues(net_dev);
        netif_carrier_off(net_dev);

        /* On dpni_disable(), the MC firmware will:
         * - stop MAC Rx and wait for all Rx frames to be enqueued to software
         * - cut off WRIOP dequeues from egress FQs and wait until transmission
         * of all in flight Tx frames is finished (and corresponding Tx conf
         * frames are enqueued back to software)
         *
         * Before calling dpni_disable(), we wait for all Tx frames to arrive
         * on WRIOP. After it finishes, wait until all remaining frames on Rx
         * and Tx conf queues are consumed on NAPI poll.
         */
        msleep(500);

        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_fq_empty(priv);
        disable_ch_napi(priv);

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

        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];
        }
}

/* 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 int dpaa2_eth_ts_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct dpaa2_eth_priv *priv = netdev_priv(dev);
        struct hwtstamp_config config;

        if (copy_from_user(&config, rq->ifr_data, sizeof(config)))
                return -EFAULT;

        switch (config.tx_type) {
        case HWTSTAMP_TX_OFF:
                priv->tx_tstamp = false;
                break;
        case HWTSTAMP_TX_ON:
                priv->tx_tstamp = true;
                break;
        default:
                return -ERANGE;
        }

        if (config.rx_filter == HWTSTAMP_FILTER_NONE) {
                priv->rx_tstamp = false;
        } else {
                priv->rx_tstamp = true;
                /* TS is set for all frame types, not only those requested */
                config.rx_filter = HWTSTAMP_FILTER_ALL;
        }

        return copy_to_user(rq->ifr_data, &config, sizeof(config)) ?
                        -EFAULT : 0;
}

static int dpaa2_eth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        if (cmd == SIOCSHWTSTAMP)
                return dpaa2_eth_ts_ioctl(dev, rq, cmd);

        return -EINVAL;
}

static bool xdp_mtu_valid(struct dpaa2_eth_priv *priv, int mtu)
{
        int mfl, linear_mfl;

        mfl = DPAA2_ETH_L2_MAX_FRM(mtu);
        linear_mfl = DPAA2_ETH_RX_BUF_SIZE - DPAA2_ETH_RX_HWA_SIZE -
                     dpaa2_eth_rx_head_room(priv) - XDP_PACKET_HEADROOM;

        if (mfl > linear_mfl) {
                netdev_warn(priv->net_dev, "Maximum MTU for XDP is %d\n",
                            linear_mfl - VLAN_ETH_HLEN);
                return false;
        }

        return true;
}

static int set_rx_mfl(struct dpaa2_eth_priv *priv, int mtu, bool has_xdp)
{
        int mfl, err;

        /* We enforce a maximum Rx frame length based on MTU only if we have
         * an XDP program attached (in order to avoid Rx S/G frames).
         * Otherwise, we accept all incoming frames as long as they are not
         * larger than maximum size supported in hardware
         */
        if (has_xdp)
                mfl = DPAA2_ETH_L2_MAX_FRM(mtu);
        else
                mfl = DPAA2_ETH_MFL;

        err = dpni_set_max_frame_length(priv->mc_io, 0, priv->mc_token, mfl);
        if (err) {
                netdev_err(priv->net_dev, "dpni_set_max_frame_length failed\n");
                return err;
        }

        return 0;
}

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

        if (!priv->xdp_prog)
                goto out;

        if (!xdp_mtu_valid(priv, new_mtu))
                return -EINVAL;

        err = set_rx_mfl(priv, new_mtu, true);
        if (err)
                return err;

out:
        dev->mtu = new_mtu;
        return 0;
}

static int update_rx_buffer_headroom(struct dpaa2_eth_priv *priv, bool has_xdp)
{
        struct dpni_buffer_layout buf_layout = {0};
        int err;

        err = dpni_get_buffer_layout(priv->mc_io, 0, priv->mc_token,
                                     DPNI_QUEUE_RX, &buf_layout);
        if (err) {
                netdev_err(priv->net_dev, "dpni_get_buffer_layout failed\n");
                return err;
        }

        /* Reserve extra headroom for XDP header size changes */
        buf_layout.data_head_room = dpaa2_eth_rx_head_room(priv) +
                                    (has_xdp ? XDP_PACKET_HEADROOM : 0);
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_DATA_HEAD_ROOM;
        err = dpni_set_buffer_layout(priv->mc_io, 0, priv->mc_token,
                                     DPNI_QUEUE_RX, &buf_layout);
        if (err) {
                netdev_err(priv->net_dev, "dpni_set_buffer_layout failed\n");
                return err;
        }

        return 0;
}

static int setup_xdp(struct net_device *dev, struct bpf_prog *prog)
{
        struct dpaa2_eth_priv *priv = netdev_priv(dev);
        struct dpaa2_eth_channel *ch;
        struct bpf_prog *old;
        bool up, need_update;
        int i, err;

        if (prog && !xdp_mtu_valid(priv, dev->mtu))
                return -EINVAL;

        if (prog) {
                prog = bpf_prog_add(prog, priv->num_channels);
                if (IS_ERR(prog))
                        return PTR_ERR(prog);
        }

        up = netif_running(dev);
        need_update = (!!priv->xdp_prog != !!prog);

        if (up)
                dpaa2_eth_stop(dev);

        /* While in xdp mode, enforce a maximum Rx frame size based on MTU.
         * Also, when switching between xdp/non-xdp modes we need to reconfigure
         * our Rx buffer layout. Buffer pool was drained on dpaa2_eth_stop,
         * so we are sure no old format buffers will be used from now on.
         */
        if (need_update) {
                err = set_rx_mfl(priv, dev->mtu, !!prog);
                if (err)
                        goto out_err;
                err = update_rx_buffer_headroom(priv, !!prog);
                if (err)
                        goto out_err;
        }

        old = xchg(&priv->xdp_prog, prog);
        if (old)
                bpf_prog_put(old);

        for (i = 0; i < priv->num_channels; i++) {
                ch = priv->channel[i];
                old = xchg(&ch->xdp.prog, prog);
                if (old)
                        bpf_prog_put(old);
        }

        if (up) {
                err = dpaa2_eth_open(dev);
                if (err)
                        return err;
        }

        return 0;

out_err:
        if (prog)
                bpf_prog_sub(prog, priv->num_channels);
        if (up)
                dpaa2_eth_open(dev);

        return err;
}

static int dpaa2_eth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
{
        struct dpaa2_eth_priv *priv = netdev_priv(dev);

        switch (xdp->command) {
        case XDP_SETUP_PROG:
                return setup_xdp(dev, xdp->prog);
        case XDP_QUERY_PROG:
                xdp->prog_id = priv->xdp_prog ? priv->xdp_prog->aux->id : 0;
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int dpaa2_eth_xdp_xmit_frame(struct net_device *net_dev,
                                    struct xdp_frame *xdpf)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct device *dev = net_dev->dev.parent;
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa2_eth_drv_stats *percpu_extras;
        unsigned int needed_headroom;
        struct dpaa2_eth_swa *swa;
        struct dpaa2_eth_fq *fq;
        struct dpaa2_fd fd;
        void *buffer_start, *aligned_start;
        dma_addr_t addr;
        int err, i;

        /* We require a minimum headroom to be able to transmit the frame.
         * Otherwise return an error and let the original net_device handle it
         */
        needed_headroom = dpaa2_eth_needed_headroom(priv, NULL);
        if (xdpf->headroom < needed_headroom)
                return -EINVAL;

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

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

        /* Align FD address, if possible */
        buffer_start = xdpf->data - needed_headroom;
        aligned_start = PTR_ALIGN(buffer_start - DPAA2_ETH_TX_BUF_ALIGN,
                                  DPAA2_ETH_TX_BUF_ALIGN);
        if (aligned_start >= xdpf->data - xdpf->headroom)
                buffer_start = aligned_start;

        swa = (struct dpaa2_eth_swa *)buffer_start;
        /* fill in necessary fields here */
        swa->type = DPAA2_ETH_SWA_XDP;
        swa->xdp.dma_size = xdpf->data + xdpf->len - buffer_start;
        swa->xdp.xdpf = xdpf;

        addr = dma_map_single(dev, buffer_start,
                              swa->xdp.dma_size,
                              DMA_BIDIRECTIONAL);
        if (unlikely(dma_mapping_error(dev, addr))) {
                percpu_stats->tx_dropped++;
                return -ENOMEM;
        }

        dpaa2_fd_set_addr(&fd, addr);
        dpaa2_fd_set_offset(&fd, xdpf->data - buffer_start);
        dpaa2_fd_set_len(&fd, xdpf->len);
        dpaa2_fd_set_format(&fd, dpaa2_fd_single);
        dpaa2_fd_set_ctrl(&fd, FD_CTRL_PTA);

        fq = &priv->fq[smp_processor_id() % dpaa2_eth_queue_count(priv)];
        for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
                err = priv->enqueue(priv, fq, &fd, 0);
                if (err != -EBUSY)
                        break;
        }
        percpu_extras->tx_portal_busy += i;
        if (unlikely(err < 0)) {
                percpu_stats->tx_errors++;
                /* let the Rx device handle the cleanup */
                return err;
        }

        percpu_stats->tx_packets++;
        percpu_stats->tx_bytes += dpaa2_fd_get_len(&fd);

        return 0;
}

static int dpaa2_eth_xdp_xmit(struct net_device *net_dev, int n,
                              struct xdp_frame **frames, u32 flags)
{
        int drops = 0;
        int i, err;

        if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
                return -EINVAL;

        if (!netif_running(net_dev))
                return -ENETDOWN;

        for (i = 0; i < n; i++) {
                struct xdp_frame *xdpf = frames[i];

                err = dpaa2_eth_xdp_xmit_frame(net_dev, xdpf);
                if (err) {
                        xdp_return_frame_rx_napi(xdpf);
                        drops++;
                }
        }

        return n - drops;
}

static int update_xps(struct dpaa2_eth_priv *priv)
{
        struct net_device *net_dev = priv->net_dev;
        struct cpumask xps_mask;
        struct dpaa2_eth_fq *fq;
        int i, num_queues, netdev_queues;
        int err = 0;

        num_queues = dpaa2_eth_queue_count(priv);
        netdev_queues = (net_dev->num_tc ? : 1) * num_queues;

        /* The first <num_queues> entries in priv->fq array are Tx/Tx conf
         * queues, so only process those
         */
        for (i = 0; i < netdev_queues; i++) {
                fq = &priv->fq[i % num_queues];

                cpumask_clear(&xps_mask);
                cpumask_set_cpu(fq->target_cpu, &xps_mask);

                err = netif_set_xps_queue(net_dev, &xps_mask, i);
                if (err) {
                        netdev_warn_once(net_dev, "Error setting XPS queue\n");
                        break;
                }
        }

        return err;
}

static int dpaa2_eth_setup_tc(struct net_device *net_dev,
                              enum tc_setup_type type, void *type_data)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct tc_mqprio_qopt *mqprio = type_data;
        u8 num_tc, num_queues;
        int i;

        if (type != TC_SETUP_QDISC_MQPRIO)
                return -EINVAL;

        mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
        num_queues = dpaa2_eth_queue_count(priv);
        num_tc = mqprio->num_tc;

        if (num_tc == net_dev->num_tc)
                return 0;

        if (num_tc  > dpaa2_eth_tc_count(priv)) {
                netdev_err(net_dev, "Max %d traffic classes supported\n",
                           dpaa2_eth_tc_count(priv));
                return -EINVAL;
        }

        if (!num_tc) {
                netdev_reset_tc(net_dev);
                netif_set_real_num_tx_queues(net_dev, num_queues);
                goto out;
        }

        netdev_set_num_tc(net_dev, num_tc);
        netif_set_real_num_tx_queues(net_dev, num_tc * num_queues);

        for (i = 0; i < num_tc; i++)
                netdev_set_tc_queue(net_dev, i, num_queues, i * num_queues);

out:
        update_xps(priv);

        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_set_mac_address = dpaa2_eth_set_addr,
        .ndo_get_stats64 = dpaa2_eth_get_stats,
        .ndo_set_rx_mode = dpaa2_eth_set_rx_mode,
        .ndo_set_features = dpaa2_eth_set_features,
        .ndo_do_ioctl = dpaa2_eth_ioctl,
        .ndo_change_mtu = dpaa2_eth_change_mtu,
        .ndo_bpf = dpaa2_eth_xdp,
        .ndo_xdp_xmit = dpaa2_eth_xdp_xmit,
        .ndo_setup_tc = dpaa2_eth_setup_tc,
};

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) {
                if (err == -ENXIO)
                        err = -EPROBE_DEFER;
                else
                        dev_info(dev, "Not enough DPCONs, will go on as-is\n");
                return ERR_PTR(err);
        }

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

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

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

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

        return dpcon;

close:
        dpcon_close(priv->mc_io, 0, dpcon->mc_handle);
free:
        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 (IS_ERR_OR_NULL(channel->dpcon)) {
                err = PTR_ERR_OR_ZERO(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 ERR_PTR(err);
}

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 (IS_ERR_OR_NULL(channel)) {
                        err = PTR_ERR_OR_ZERO(channel);
                        if (err != -EPROBE_DEFER)
                                dev_info(dev,
                                         "No affine channel for cpu %d and above\n", i);
                        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 */
                channel->dpio = dpaa2_io_service_select(i);
                err = dpaa2_io_service_register(channel->dpio, nctx, dev);
                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 == priv->dpni_attrs.num_queues)
                        break;
        }

        return 0;

err_set_cdan:
        dpaa2_io_service_deregister(channel->dpio, nctx, dev);
err_service_reg:
        free_channel(priv, channel);
err_alloc_ch:
        if (err == -EPROBE_DEFER)
                return err;

        if (cpumask_empty(&priv->dpio_cpumask)) {
                dev_err(dev, "No cpu with an affine DPIO/DPCON\n");
                return -ENODEV;
        }

        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)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpaa2_eth_channel *ch;
        int i;

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

        update_xps(priv);
}

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) {
                if (err == -ENXIO)
                        err = -EPROBE_DEFER;
                else
                        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);
}

static int set_buffer_layout(struct dpaa2_eth_priv *priv)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpni_buffer_layout buf_layout = {0};
        u16 rx_buf_align;
        int err;

        /* We need to check for WRIOP version 1.0.0, but depending on the MC
         * version, this number is not always provided correctly on rev1.
         * We need to check for both alternatives in this situation.
         */
        if (priv->dpni_attrs.wriop_version == DPAA2_WRIOP_VERSION(0, 0, 0) ||
            priv->dpni_attrs.wriop_version == DPAA2_WRIOP_VERSION(1, 0, 0))
                rx_buf_align = DPAA2_ETH_RX_BUF_ALIGN_REV1;
        else
                rx_buf_align = DPAA2_ETH_RX_BUF_ALIGN;

        /* tx buffer */
        buf_layout.private_data_size = DPAA2_ETH_SWA_SIZE;
        buf_layout.pass_timestamp = true;
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_PRIVATE_DATA_SIZE |
                             DPNI_BUF_LAYOUT_OPT_TIMESTAMP;
        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");
                return err;
        }

        /* tx-confirm buffer */
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_TIMESTAMP;
        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");
                return err;
        }

        /* 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");
                return err;
        }

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

        /* rx buffer */
        buf_layout.pass_frame_status = true;
        buf_layout.pass_parser_result = true;
        buf_layout.data_align = rx_buf_align;
        buf_layout.data_head_room = dpaa2_eth_rx_head_room(priv);
        buf_layout.private_data_size = 0;
        buf_layout.options = DPNI_BUF_LAYOUT_OPT_PARSER_RESULT |
                             DPNI_BUF_LAYOUT_OPT_FRAME_STATUS |
                             DPNI_BUF_LAYOUT_OPT_DATA_ALIGN |
                             DPNI_BUF_LAYOUT_OPT_DATA_HEAD_ROOM |
                             DPNI_BUF_LAYOUT_OPT_TIMESTAMP;
        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");
                return err;
        }

        return 0;
}

#define DPNI_ENQUEUE_FQID_VER_MAJOR     7
#define DPNI_ENQUEUE_FQID_VER_MINOR     9

static inline int dpaa2_eth_enqueue_qd(struct dpaa2_eth_priv *priv,
                                       struct dpaa2_eth_fq *fq,
                                       struct dpaa2_fd *fd, u8 prio)
{
        return dpaa2_io_service_enqueue_qd(fq->channel->dpio,
                                           priv->tx_qdid, prio,
                                           fq->tx_qdbin, fd);
}

static inline int dpaa2_eth_enqueue_fq(struct dpaa2_eth_priv *priv,
                                       struct dpaa2_eth_fq *fq,
                                       struct dpaa2_fd *fd, u8 prio)
{
        return dpaa2_io_service_enqueue_fq(fq->channel->dpio,
                                           fq->tx_fqid[prio], fd);
}

static void set_enqueue_mode(struct dpaa2_eth_priv *priv)
{
        if (dpaa2_eth_cmp_dpni_ver(priv, DPNI_ENQUEUE_FQID_VER_MAJOR,
                                   DPNI_ENQUEUE_FQID_VER_MINOR) < 0)
                priv->enqueue = dpaa2_eth_enqueue_qd;
        else
                priv->enqueue = dpaa2_eth_enqueue_fq;
}

/* 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;
        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");
                return err;
        }

        /* Check if we can work with this DPNI object */
        err = dpni_get_api_version(priv->mc_io, 0, &priv->dpni_ver_major,
                                   &priv->dpni_ver_minor);
        if (err) {
                dev_err(dev, "dpni_get_api_version() failed\n");
                goto close;
        }
        if (dpaa2_eth_cmp_dpni_ver(priv, DPNI_VER_MAJOR, DPNI_VER_MINOR) < 0) {
                dev_err(dev, "DPNI version %u.%u not supported, need >= %u.%u\n",
                        priv->dpni_ver_major, priv->dpni_ver_minor,
                        DPNI_VER_MAJOR, DPNI_VER_MINOR);
                err = -ENOTSUPP;
                goto close;
        }

        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 close;
        }

        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 close;
        }

        err = set_buffer_layout(priv);
        if (err)
                goto close;

        set_enqueue_mode(priv);

        priv->cls_rules = devm_kzalloc(dev, sizeof(struct dpaa2_eth_cls_rule) *
                                       dpaa2_eth_fs_count(priv), GFP_KERNEL);
        if (!priv->cls_rules)
                goto close;

        return 0;

close:
        dpni_close(priv->mc_io, 0, priv->mc_token);

        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)(uintptr_t)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;
        }

        /* xdp_rxq setup */
        err = xdp_rxq_info_reg(&fq->channel->xdp_rxq, priv->net_dev,
                               fq->flowid);
        if (err) {
                dev_err(dev, "xdp_rxq_info_reg failed\n");
                return err;
        }

        err = xdp_rxq_info_reg_mem_model(&fq->channel->xdp_rxq,
                                         MEM_TYPE_PAGE_ORDER0, NULL);
        if (err) {
                dev_err(dev, "xdp_rxq_info_reg_mem_model 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 i, err;

        for (i = 0; i < dpaa2_eth_tc_count(priv); i++) {
                err = dpni_get_queue(priv->mc_io, 0, priv->mc_token,
                                     DPNI_QUEUE_TX, i, fq->flowid,
                                     &queue, &qid);
                if (err) {
                        dev_err(dev, "dpni_get_queue(TX) failed\n");
                        return err;
                }
                fq->tx_fqid[i] = qid.fqid;
        }

        /* All Tx queues belonging to the same flowid have the same qdbin */
        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)(uintptr_t)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;
}

/* Supported header fields for Rx hash distribution key */
static const struct dpaa2_eth_dist_fields dist_fields[] = {
        {
                /* L2 header */
                .rxnfc_field = RXH_L2DA,
                .cls_prot = NET_PROT_ETH,
                .cls_field = NH_FLD_ETH_DA,
                .id = DPAA2_ETH_DIST_ETHDST,
                .size = 6,
        }, {
                .cls_prot = NET_PROT_ETH,
                .cls_field = NH_FLD_ETH_SA,
                .id = DPAA2_ETH_DIST_ETHSRC,
                .size = 6,
        }, {
                /* This is the last ethertype field parsed:
                 * depending on frame format, it can be the MAC ethertype
                 * or the VLAN etype.
                 */
                .cls_prot = NET_PROT_ETH,
                .cls_field = NH_FLD_ETH_TYPE,
                .id = DPAA2_ETH_DIST_ETHTYPE,
                .size = 2,
        }, {
                /* VLAN header */
                .rxnfc_field = RXH_VLAN,
                .cls_prot = NET_PROT_VLAN,
                .cls_field = NH_FLD_VLAN_TCI,
                .id = DPAA2_ETH_DIST_VLAN,
                .size = 2,
        }, {
                /* IP header */
                .rxnfc_field = RXH_IP_SRC,
                .cls_prot = NET_PROT_IP,
                .cls_field = NH_FLD_IP_SRC,
                .id = DPAA2_ETH_DIST_IPSRC,
                .size = 4,
        }, {
                .rxnfc_field = RXH_IP_DST,
                .cls_prot = NET_PROT_IP,
                .cls_field = NH_FLD_IP_DST,
                .id = DPAA2_ETH_DIST_IPDST,
                .size = 4,
        }, {
                .rxnfc_field = RXH_L3_PROTO,
                .cls_prot = NET_PROT_IP,
                .cls_field = NH_FLD_IP_PROTO,
                .id = DPAA2_ETH_DIST_IPPROTO,
                .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,
                .id = DPAA2_ETH_DIST_L4SRC,
                .size = 2,
        }, {
                .rxnfc_field = RXH_L4_B_2_3,
                .cls_prot = NET_PROT_UDP,
                .cls_field = NH_FLD_UDP_PORT_DST,
                .id = DPAA2_ETH_DIST_L4DST,
                .size = 2,
        },
};

/* Configure the Rx hash key using the legacy API */
static int config_legacy_hash_key(struct dpaa2_eth_priv *priv, dma_addr_t key)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpni_rx_tc_dist_cfg dist_cfg;
        int err;

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

        dist_cfg.key_cfg_iova = key;
        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);
        if (err)
                dev_err(dev, "dpni_set_rx_tc_dist failed\n");

        return err;
}

/* Configure the Rx hash key using the new API */
static int config_hash_key(struct dpaa2_eth_priv *priv, dma_addr_t key)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpni_rx_dist_cfg dist_cfg;
        int err;

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

        dist_cfg.key_cfg_iova = key;
        dist_cfg.dist_size = dpaa2_eth_queue_count(priv);
        dist_cfg.enable = 1;

        err = dpni_set_rx_hash_dist(priv->mc_io, 0, priv->mc_token, &dist_cfg);
        if (err)
                dev_err(dev, "dpni_set_rx_hash_dist failed\n");

        return err;
}

/* Configure the Rx flow classification key */
static int config_cls_key(struct dpaa2_eth_priv *priv, dma_addr_t key)
{
        struct device *dev = priv->net_dev->dev.parent;
        struct dpni_rx_dist_cfg dist_cfg;
        int err;

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

        dist_cfg.key_cfg_iova = key;
        dist_cfg.dist_size = dpaa2_eth_queue_count(priv);
        dist_cfg.enable = 1;

        err = dpni_set_rx_fs_dist(priv->mc_io, 0, priv->mc_token, &dist_cfg);
        if (err)
                dev_err(dev, "dpni_set_rx_fs_dist failed\n");

        return err;
}

/* Size of the Rx flow classification key */
int dpaa2_eth_cls_key_size(u64 fields)
{
        int i, size = 0;

        for (i = 0; i < ARRAY_SIZE(dist_fields); i++) {
                if (!(fields & dist_fields[i].id))
                        continue;
                size += dist_fields[i].size;
        }

        return size;
}

/* Offset of header field in Rx classification key */
int dpaa2_eth_cls_fld_off(int prot, int field)
{
        int i, off = 0;

        for (i = 0; i < ARRAY_SIZE(dist_fields); i++) {
                if (dist_fields[i].cls_prot == prot &&
                    dist_fields[i].cls_field == field)
                        return off;
                off += dist_fields[i].size;
        }

        WARN_ONCE(1, "Unsupported header field used for Rx flow cls\n");
        return 0;
}

/* Prune unused fields from the classification rule.
 * Used when masking is not supported
 */
void dpaa2_eth_cls_trim_rule(void *key_mem, u64 fields)
{
        int off = 0, new_off = 0;
        int i, size;

        for (i = 0; i < ARRAY_SIZE(dist_fields); i++) {
                size = dist_fields[i].size;
                if (dist_fields[i].id & fields) {
                        memcpy(key_mem + new_off, key_mem + off, size);
                        new_off += size;
                }
                off += size;
        }
}

/* Set Rx distribution (hash or flow classification) key
 * flags is a combination of RXH_ bits
 */
static int dpaa2_eth_set_dist_key(struct net_device *net_dev,
                                  enum dpaa2_eth_rx_dist type, u64 flags)
{
        struct device *dev = net_dev->dev.parent;
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        struct dpkg_profile_cfg cls_cfg;
        u32 rx_hash_fields = 0;
        dma_addr_t key_iova;
        u8 *dma_mem;
        int i;
        int err = 0;

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

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

                /* For both Rx hashing and classification keys
                 * we set only the selected fields.
                 */
                if (!(flags & dist_fields[i].id))
                        continue;
                if (type == DPAA2_ETH_RX_DIST_HASH)
                        rx_hash_fields |= dist_fields[i].rxnfc_field;

                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 = dist_fields[i].cls_prot;
                key->extract.from_hdr.type = DPKG_FULL_FIELD;
                key->extract.from_hdr.field = dist_fields[i].cls_field;
                cls_cfg.num_extracts++;
        }

        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 free_key;
        }

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

        if (type == DPAA2_ETH_RX_DIST_HASH) {
                if (dpaa2_eth_has_legacy_dist(priv))
                        err = config_legacy_hash_key(priv, key_iova);
                else
                        err = config_hash_key(priv, key_iova);
        } else {
                err = config_cls_key(priv, key_iova);
        }

        dma_unmap_single(dev, key_iova, DPAA2_CLASSIFIER_DMA_SIZE,
                         DMA_TO_DEVICE);
        if (!err && type == DPAA2_ETH_RX_DIST_HASH)
                priv->rx_hash_fields = rx_hash_fields;

free_key:
        kfree(dma_mem);
        return err;
}

int dpaa2_eth_set_hash(struct net_device *net_dev, u64 flags)
{
        struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
        u64 key = 0;
        int i;

        if (!dpaa2_eth_hash_enabled(priv))
                return -EOPNOTSUPP;

        for (i = 0; i < ARRAY_SIZE(dist_fields); i++)
                if (dist_fields[i].rxnfc_field & flags)
                        key |= dist_fields[i].id;

        return dpaa2_eth_set_dist_key(net_dev, DPAA2_ETH_RX_DIST_HASH, key);
}

int dpaa2_eth_set_cls(struct net_device *net_dev, u64 flags)
{
        return dpaa2_eth_set_dist_key(net_dev, DPAA2_ETH_RX_DIST_CLS, flags);
}

static int dpaa2_eth_set_default_cls(struct dpaa2_eth_priv *priv)
{
        struct device *dev = priv->net_dev->dev.parent;
        int err;

        /* Check if we actually support Rx flow classification */
        if (dpaa2_eth_has_legacy_dist(priv)) {
                dev_dbg(dev, "Rx cls not supported by current MC version\n");
                return -EOPNOTSUPP;
        }

        if (!dpaa2_eth_fs_enabled(priv)) {
                dev_dbg(dev, "Rx cls disabled in DPNI options\n");
                return -EOPNOTSUPP;
        }

        if (!dpaa2_eth_hash_enabled(priv)) {
                dev_dbg(dev, "Rx cls disabled for single queue DPNIs\n");
                return -EOPNOTSUPP;
        }

        /* If there is no support for masking in the classification table,
         * we don't set a default key, as it will depend on the rules
         * added by the user at runtime.
         */
        if (!dpaa2_eth_fs_mask_enabled(priv))
                goto out;

        err = dpaa2_eth_set_cls(priv->net_dev, DPAA2_ETH_DIST_ALL);
        if (err)
                return err;

out:
        priv->rx_cls_enabled = 1;

        return 0;
}

/* 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
         * the default hash key
         */
        err = dpaa2_eth_set_hash(net_dev, DPAA2_RXH_DEFAULT);
        if (err && err != -EOPNOTSUPP)
                dev_err(dev, "Failed to configure hashing\n");

        /* Configure the flow classification key; it includes all
         * supported header fields and cannot be modified at runtime
         */
        err = dpaa2_eth_set_default_cls(priv);
        if (err && err != -EOPNOTSUPP)
                dev_err(dev, "Failed to configure Rx classification key\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;