/* Copyright 2008 - 2016 Freescale Semiconductor Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Freescale Semiconductor nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/io.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/icmp.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/highmem.h>
#include <linux/percpu.h>
#include <linux/dma-mapping.h>
#include <linux/sort.h>
#include <linux/phy_fixed.h>
#include <soc/fsl/bman.h>
#include <soc/fsl/qman.h>
#include "fman.h"
#include "fman_port.h"
#include "mac.h"
#include "dpaa_eth.h"

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

static int debug = -1;
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "Module/Driver verbosity level (0=none,...,16=all)");

static u16 tx_timeout = 1000;
module_param(tx_timeout, ushort, 0444);
MODULE_PARM_DESC(tx_timeout, "The Tx timeout in ms");

#define FM_FD_STAT_RX_ERRORS                                            \
        (FM_FD_ERR_DMA | FM_FD_ERR_PHYSICAL     | \
         FM_FD_ERR_SIZE | FM_FD_ERR_CLS_DISCARD | \
         FM_FD_ERR_EXTRACTION | FM_FD_ERR_NO_SCHEME     | \
         FM_FD_ERR_PRS_TIMEOUT | FM_FD_ERR_PRS_ILL_INSTRUCT | \
         FM_FD_ERR_PRS_HDR_ERR)

#define FM_FD_STAT_TX_ERRORS \
        (FM_FD_ERR_UNSUPPORTED_FORMAT | \
         FM_FD_ERR_LENGTH | FM_FD_ERR_DMA)

#define DPAA_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | \
                          NETIF_MSG_LINK | NETIF_MSG_IFUP | \
                          NETIF_MSG_IFDOWN)

#define DPAA_INGRESS_CS_THRESHOLD 0x10000000
/* Ingress congestion threshold on FMan ports
 * The size in bytes of the ingress tail-drop threshold on FMan ports.
 * Traffic piling up above this value will be rejected by QMan and discarded
 * by FMan.
 */

/* Size in bytes of the FQ taildrop threshold */
#define DPAA_FQ_TD 0x200000

#define DPAA_CS_THRESHOLD_1G 0x06000000
/* Egress congestion threshold on 1G ports, range 0x1000 .. 0x10000000
 * The size in bytes of the egress Congestion State notification threshold on
 * 1G ports. The 1G dTSECs can quite easily be flooded by cores doing Tx in a
 * tight loop (e.g. by sending UDP datagrams at "while(1) speed"),
 * and the larger the frame size, the more acute the problem.
 * So we have to find a balance between these factors:
 * - avoiding the device staying congested for a prolonged time (risking
 *   the netdev watchdog to fire - see also the tx_timeout module param);
 * - affecting performance of protocols such as TCP, which otherwise
 *   behave well under the congestion notification mechanism;
 * - preventing the Tx cores from tightly-looping (as if the congestion
 *   threshold was too low to be effective);
 * - running out of memory if the CS threshold is set too high.
 */

#define DPAA_CS_THRESHOLD_10G 0x10000000
/* The size in bytes of the egress Congestion State notification threshold on
 * 10G ports, range 0x1000 .. 0x10000000
 */

/* Largest value that the FQD's OAL field can hold */
#define FSL_QMAN_MAX_OAL        127

/* Default alignment for start of data in an Rx FD */
#define DPAA_FD_DATA_ALIGNMENT  16

/* The DPAA requires 256 bytes reserved and mapped for the SGT */
#define DPAA_SGT_SIZE 256

/* Values for the L3R field of the FM Parse Results
 */
/* L3 Type field: First IP Present IPv4 */
#define FM_L3_PARSE_RESULT_IPV4 0x8000
/* L3 Type field: First IP Present IPv6 */
#define FM_L3_PARSE_RESULT_IPV6 0x4000
/* Values for the L4R field of the FM Parse Results */
/* L4 Type field: UDP */
#define FM_L4_PARSE_RESULT_UDP  0x40
/* L4 Type field: TCP */
#define FM_L4_PARSE_RESULT_TCP  0x20

/* FD status field indicating whether the FM Parser has attempted to validate
 * the L4 csum of the frame.
 * Note that having this bit set doesn't necessarily imply that the checksum
 * is valid. One would have to check the parse results to find that out.
 */
#define FM_FD_STAT_L4CV         0x00000004

#define DPAA_SGT_MAX_ENTRIES 16 /* maximum number of entries in SG Table */
#define DPAA_BUFF_RELEASE_MAX 8 /* maximum number of buffers released at once */

#define FSL_DPAA_BPID_INV               0xff
#define FSL_DPAA_ETH_MAX_BUF_COUNT      128
#define FSL_DPAA_ETH_REFILL_THRESHOLD   80

#define DPAA_TX_PRIV_DATA_SIZE  16
#define DPAA_PARSE_RESULTS_SIZE sizeof(struct fman_prs_result)
#define DPAA_TIME_STAMP_SIZE 8
#define DPAA_HASH_RESULTS_SIZE 8
#define DPAA_RX_PRIV_DATA_SIZE  (u16)(DPAA_TX_PRIV_DATA_SIZE + \
                                        dpaa_rx_extra_headroom)

#define DPAA_ETH_PCD_RXQ_NUM    128

#define DPAA_ENQUEUE_RETRIES    100000

enum port_type {RX, TX};

struct fm_port_fqs {
        struct dpaa_fq *tx_defq;
        struct dpaa_fq *tx_errq;
        struct dpaa_fq *rx_defq;
        struct dpaa_fq *rx_errq;
        struct dpaa_fq *rx_pcdq;
};

/* All the dpa bps in use at any moment */
static struct dpaa_bp *dpaa_bp_array[BM_MAX_NUM_OF_POOLS];

/* The raw buffer size must be cacheline aligned */
#define DPAA_BP_RAW_SIZE 4096
/* When using more than one buffer pool, the raw sizes are as follows:
 * 1 bp: 4KB
 * 2 bp: 2KB, 4KB
 * 3 bp: 1KB, 2KB, 4KB
 * 4 bp: 1KB, 2KB, 4KB, 8KB
 */
static inline size_t bpool_buffer_raw_size(u8 index, u8 cnt)
{
        size_t res = DPAA_BP_RAW_SIZE / 4;
        u8 i;

        for (i = (cnt < 3) ? cnt : 3; i < 3 + index; i++)
                res *= 2;
        return res;
}

/* FMan-DMA requires 16-byte alignment for Rx buffers, but SKB_DATA_ALIGN is
 * even stronger (SMP_CACHE_BYTES-aligned), so we just get away with that,
 * via SKB_WITH_OVERHEAD(). We can't rely on netdev_alloc_frag() giving us
 * half-page-aligned buffers, so we reserve some more space for start-of-buffer
 * alignment.
 */
#define dpaa_bp_size(raw_size) SKB_WITH_OVERHEAD((raw_size) - SMP_CACHE_BYTES)

static int dpaa_max_frm;

static int dpaa_rx_extra_headroom;

#define dpaa_get_max_mtu()      \
        (dpaa_max_frm - (VLAN_ETH_HLEN + ETH_FCS_LEN))

static int dpaa_netdev_init(struct net_device *net_dev,
                            const struct net_device_ops *dpaa_ops,
                            u16 tx_timeout)
{
        struct dpaa_priv *priv = netdev_priv(net_dev);
        struct device *dev = net_dev->dev.parent;
        struct dpaa_percpu_priv *percpu_priv;
        const u8 *mac_addr;
        int i, err;

        /* Although we access another CPU's private data here
         * we do it at initialization so it is safe
         */
        for_each_possible_cpu(i) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, i);
                percpu_priv->net_dev = net_dev;
        }

        net_dev->netdev_ops = dpaa_ops;
        mac_addr = priv->mac_dev->addr;

        net_dev->mem_start = priv->mac_dev->res->start;
        net_dev->mem_end = priv->mac_dev->res->end;

        net_dev->min_mtu = ETH_MIN_MTU;
        net_dev->max_mtu = dpaa_get_max_mtu();

        net_dev->hw_features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                                 NETIF_F_LLTX | NETIF_F_RXHASH);

        net_dev->hw_features |= NETIF_F_SG | NETIF_F_HIGHDMA;
        /* The kernels enables GSO automatically, if we declare NETIF_F_SG.
         * For conformity, we'll still declare GSO explicitly.
         */
        net_dev->features |= NETIF_F_GSO;
        net_dev->features |= NETIF_F_RXCSUM;

        net_dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
        /* we do not want shared skbs on TX */
        net_dev->priv_flags &= ~IFF_TX_SKB_SHARING;

        net_dev->features |= net_dev->hw_features;
        net_dev->vlan_features = net_dev->features;

        memcpy(net_dev->perm_addr, mac_addr, net_dev->addr_len);
        memcpy(net_dev->dev_addr, mac_addr, net_dev->addr_len);

        net_dev->ethtool_ops = &dpaa_ethtool_ops;

        net_dev->needed_headroom = priv->tx_headroom;
        net_dev->watchdog_timeo = msecs_to_jiffies(tx_timeout);

        /* start without the RUNNING flag, phylib controls it later */
        netif_carrier_off(net_dev);

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

        return 0;
}

static int dpaa_stop(struct net_device *net_dev)
{
        struct mac_device *mac_dev;
        struct dpaa_priv *priv;
        int i, err, error;

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

        netif_tx_stop_all_queues(net_dev);
        /* Allow the Fman (Tx) port to process in-flight frames before we
         * try switching it off.
         */
        usleep_range(5000, 10000);

        err = mac_dev->stop(mac_dev);
        if (err < 0)
                netif_err(priv, ifdown, net_dev, "mac_dev->stop() = %d\n",
                          err);

        for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++) {
                error = fman_port_disable(mac_dev->port[i]);
                if (error)
                        err = error;
        }

        if (net_dev->phydev)
                phy_disconnect(net_dev->phydev);
        net_dev->phydev = NULL;

        return err;
}

static void dpaa_tx_timeout(struct net_device *net_dev)
{
        struct dpaa_percpu_priv *percpu_priv;
        const struct dpaa_priv  *priv;

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

        netif_crit(priv, timer, net_dev, "Transmit timeout latency: %u ms\n",
                   jiffies_to_msecs(jiffies - dev_trans_start(net_dev)));

        percpu_priv->stats.tx_errors++;
}

/* Calculates the statistics for the given device by adding the statistics
 * collected by each CPU.
 */
static void dpaa_get_stats64(struct net_device *net_dev,
                             struct rtnl_link_stats64 *s)
{
        int numstats = sizeof(struct rtnl_link_stats64) / sizeof(u64);
        struct dpaa_priv *priv = netdev_priv(net_dev);
        struct dpaa_percpu_priv *percpu_priv;
        u64 *netstats = (u64 *)s;
        u64 *cpustats;
        int i, j;

        for_each_possible_cpu(i) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, i);

                cpustats = (u64 *)&percpu_priv->stats;

                /* add stats from all CPUs */
                for (j = 0; j < numstats; j++)
                        netstats[j] += cpustats[j];
        }
}

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

        if (type != TC_SETUP_QDISC_MQPRIO)
                return -EOPNOTSUPP;

        mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
        num_tc = mqprio->num_tc;

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

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

        if (num_tc > DPAA_TC_NUM) {
                netdev_err(net_dev, "Too many traffic classes: max %d supported.\n",
                           DPAA_TC_NUM);
                return -EINVAL;
        }

        netdev_set_num_tc(net_dev, num_tc);

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

out:
        priv->num_tc = num_tc ? : 1;
        netif_set_real_num_tx_queues(net_dev, priv->num_tc * DPAA_TC_TXQ_NUM);
        return 0;
}

static struct mac_device *dpaa_mac_dev_get(struct platform_device *pdev)
{
        struct dpaa_eth_data *eth_data;
        struct device *dpaa_dev;
        struct mac_device *mac_dev;

        dpaa_dev = &pdev->dev;
        eth_data = dpaa_dev->platform_data;
        if (!eth_data) {
                dev_err(dpaa_dev, "eth_data missing\n");
                return ERR_PTR(-ENODEV);
        }
        mac_dev = eth_data->mac_dev;
        if (!mac_dev) {
                dev_err(dpaa_dev, "mac_dev missing\n");
                return ERR_PTR(-EINVAL);
        }

        return mac_dev;
}

static int dpaa_set_mac_address(struct net_device *net_dev, void *addr)
{
        const struct dpaa_priv *priv;
        struct mac_device *mac_dev;
        struct sockaddr old_addr;
        int err;

        priv = netdev_priv(net_dev);

        memcpy(old_addr.sa_data, net_dev->dev_addr,  ETH_ALEN);

        err = eth_mac_addr(net_dev, addr);
        if (err < 0) {
                netif_err(priv, drv, net_dev, "eth_mac_addr() = %d\n", err);
                return err;
        }

        mac_dev = priv->mac_dev;

        err = mac_dev->change_addr(mac_dev->fman_mac,
                                   (enet_addr_t *)net_dev->dev_addr);
        if (err < 0) {
                netif_err(priv, drv, net_dev, "mac_dev->change_addr() = %d\n",
                          err);
                /* reverting to previous address */
                eth_mac_addr(net_dev, &old_addr);

                return err;
        }

        return 0;
}

static void dpaa_set_rx_mode(struct net_device *net_dev)
{
        const struct dpaa_priv  *priv;
        int err;

        priv = netdev_priv(net_dev);

        if (!!(net_dev->flags & IFF_PROMISC) != priv->mac_dev->promisc) {
                priv->mac_dev->promisc = !priv->mac_dev->promisc;
                err = priv->mac_dev->set_promisc(priv->mac_dev->fman_mac,
                                                 priv->mac_dev->promisc);
                if (err < 0)
                        netif_err(priv, drv, net_dev,
                                  "mac_dev->set_promisc() = %d\n",
                                  err);
        }

        if (!!(net_dev->flags & IFF_ALLMULTI) != priv->mac_dev->allmulti) {
                priv->mac_dev->allmulti = !priv->mac_dev->allmulti;
                err = priv->mac_dev->set_allmulti(priv->mac_dev->fman_mac,
                                                  priv->mac_dev->allmulti);
                if (err < 0)
                        netif_err(priv, drv, net_dev,
                                  "mac_dev->set_allmulti() = %d\n",
                                  err);
        }

        err = priv->mac_dev->set_multi(net_dev, priv->mac_dev);
        if (err < 0)
                netif_err(priv, drv, net_dev, "mac_dev->set_multi() = %d\n",
                          err);
}

static struct dpaa_bp *dpaa_bpid2pool(int bpid)
{
        if (WARN_ON(bpid < 0 || bpid >= BM_MAX_NUM_OF_POOLS))
                return NULL;

        return dpaa_bp_array[bpid];
}

/* checks if this bpool is already allocated */
static bool dpaa_bpid2pool_use(int bpid)
{
        if (dpaa_bpid2pool(bpid)) {
                atomic_inc(&dpaa_bp_array[bpid]->refs);
                return true;
        }

        return false;
}

/* called only once per bpid by dpaa_bp_alloc_pool() */
static void dpaa_bpid2pool_map(int bpid, struct dpaa_bp *dpaa_bp)
{
        dpaa_bp_array[bpid] = dpaa_bp;
        atomic_set(&dpaa_bp->refs, 1);
}

static int dpaa_bp_alloc_pool(struct dpaa_bp *dpaa_bp)
{
        int err;

        if (dpaa_bp->size == 0 || dpaa_bp->config_count == 0) {
                pr_err("%s: Buffer pool is not properly initialized! Missing size or initial number of buffers\n",
                       __func__);
                return -EINVAL;
        }

        /* If the pool is already specified, we only create one per bpid */
        if (dpaa_bp->bpid != FSL_DPAA_BPID_INV &&
            dpaa_bpid2pool_use(dpaa_bp->bpid))
                return 0;

        if (dpaa_bp->bpid == FSL_DPAA_BPID_INV) {
                dpaa_bp->pool = bman_new_pool();
                if (!dpaa_bp->pool) {
                        pr_err("%s: bman_new_pool() failed\n",
                               __func__);
                        return -ENODEV;
                }

                dpaa_bp->bpid = (u8)bman_get_bpid(dpaa_bp->pool);
        }

        if (dpaa_bp->seed_cb) {
                err = dpaa_bp->seed_cb(dpaa_bp);
                if (err)
                        goto pool_seed_failed;
        }

        dpaa_bpid2pool_map(dpaa_bp->bpid, dpaa_bp);

        return 0;

pool_seed_failed:
        pr_err("%s: pool seeding failed\n", __func__);
        bman_free_pool(dpaa_bp->pool);

        return err;
}

/* remove and free all the buffers from the given buffer pool */
static void dpaa_bp_drain(struct dpaa_bp *bp)
{
        u8 num = 8;
        int ret;

        do {
                struct bm_buffer bmb[8];
                int i;

                ret = bman_acquire(bp->pool, bmb, num);
                if (ret < 0) {
                        if (num == 8) {
                                /* we have less than 8 buffers left;
                                 * drain them one by one
                                 */
                                num = 1;
                                ret = 1;
                                continue;
                        } else {
                                /* Pool is fully drained */
                                break;
                        }
                }

                if (bp->free_buf_cb)
                        for (i = 0; i < num; i++)
                                bp->free_buf_cb(bp, &bmb[i]);
        } while (ret > 0);
}

static void dpaa_bp_free(struct dpaa_bp *dpaa_bp)
{
        struct dpaa_bp *bp = dpaa_bpid2pool(dpaa_bp->bpid);

        /* the mapping between bpid and dpaa_bp is done very late in the
         * allocation procedure; if something failed before the mapping, the bp
         * was not configured, therefore we don't need the below instructions
         */
        if (!bp)
                return;

        if (!atomic_dec_and_test(&bp->refs))
                return;

        if (bp->free_buf_cb)
                dpaa_bp_drain(bp);

        dpaa_bp_array[bp->bpid] = NULL;
        bman_free_pool(bp->pool);
}

static void dpaa_bps_free(struct dpaa_priv *priv)
{
        int i;

        for (i = 0; i < DPAA_BPS_NUM; i++)
                dpaa_bp_free(priv->dpaa_bps[i]);
}

/* Use multiple WQs for FQ assignment:
 *      - Tx Confirmation queues go to WQ1.
 *      - Rx Error and Tx Error queues go to WQ5 (giving them a better chance
 *        to be scheduled, in case there are many more FQs in WQ6).
 *      - Rx Default goes to WQ6.
 *      - Tx queues go to different WQs depending on their priority. Equal
 *        chunks of NR_CPUS queues go to WQ6 (lowest priority), WQ2, WQ1 and
 *        WQ0 (highest priority).
 * This ensures that Tx-confirmed buffers are timely released. In particular,
 * it avoids congestion on the Tx Confirm FQs, which can pile up PFDRs if they
 * are greatly outnumbered by other FQs in the system, while
 * dequeue scheduling is round-robin.
 */
static inline void dpaa_assign_wq(struct dpaa_fq *fq, int idx)
{
        switch (fq->fq_type) {
        case FQ_TYPE_TX_CONFIRM:
        case FQ_TYPE_TX_CONF_MQ:
                fq->wq = 1;
                break;
        case FQ_TYPE_RX_ERROR:
        case FQ_TYPE_TX_ERROR:
                fq->wq = 5;
                break;
        case FQ_TYPE_RX_DEFAULT:
        case FQ_TYPE_RX_PCD:
                fq->wq = 6;
                break;
        case FQ_TYPE_TX:
                switch (idx / DPAA_TC_TXQ_NUM) {
                case 0:
                        /* Low priority (best effort) */
                        fq->wq = 6;
                        break;
                case 1:
                        /* Medium priority */
                        fq->wq = 2;
                        break;
                case 2:
                        /* High priority */
                        fq->wq = 1;
                        break;
                case 3:
                        /* Very high priority */
                        fq->wq = 0;
                        break;
                default:
                        WARN(1, "Too many TX FQs: more than %d!\n",
                             DPAA_ETH_TXQ_NUM);
                }
                break;
        default:
                WARN(1, "Invalid FQ type %d for FQID %d!\n",
                     fq->fq_type, fq->fqid);
        }
}

static struct dpaa_fq *dpaa_fq_alloc(struct device *dev,
                                     u32 start, u32 count,
                                     struct list_head *list,
                                     enum dpaa_fq_type fq_type)
{
        struct dpaa_fq *dpaa_fq;
        int i;

        dpaa_fq = devm_kcalloc(dev, count, sizeof(*dpaa_fq),
                               GFP_KERNEL);
        if (!dpaa_fq)
                return NULL;

        for (i = 0; i < count; i++) {
                dpaa_fq[i].fq_type = fq_type;
                dpaa_fq[i].fqid = start ? start + i : 0;
                list_add_tail(&dpaa_fq[i].list, list);
        }

        for (i = 0; i < count; i++)
                dpaa_assign_wq(dpaa_fq + i, i);

        return dpaa_fq;
}

static int dpaa_alloc_all_fqs(struct device *dev, struct list_head *list,
                              struct fm_port_fqs *port_fqs)
{
        struct dpaa_fq *dpaa_fq;
        u32 fq_base, fq_base_aligned, i;

        dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_RX_ERROR);
        if (!dpaa_fq)
                goto fq_alloc_failed;

        port_fqs->rx_errq = &dpaa_fq[0];

        dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_RX_DEFAULT);
        if (!dpaa_fq)
                goto fq_alloc_failed;

        port_fqs->rx_defq = &dpaa_fq[0];

        /* the PCD FQIDs range needs to be aligned for correct operation */
        if (qman_alloc_fqid_range(&fq_base, 2 * DPAA_ETH_PCD_RXQ_NUM))
                goto fq_alloc_failed;

        fq_base_aligned = ALIGN(fq_base, DPAA_ETH_PCD_RXQ_NUM);

        for (i = fq_base; i < fq_base_aligned; i++)
                qman_release_fqid(i);

        for (i = fq_base_aligned + DPAA_ETH_PCD_RXQ_NUM;
             i < (fq_base + 2 * DPAA_ETH_PCD_RXQ_NUM); i++)
                qman_release_fqid(i);

        dpaa_fq = dpaa_fq_alloc(dev, fq_base_aligned, DPAA_ETH_PCD_RXQ_NUM,
                                list, FQ_TYPE_RX_PCD);
        if (!dpaa_fq)
                goto fq_alloc_failed;

        port_fqs->rx_pcdq = &dpaa_fq[0];

        if (!dpaa_fq_alloc(dev, 0, DPAA_ETH_TXQ_NUM, list, FQ_TYPE_TX_CONF_MQ))
                goto fq_alloc_failed;

        dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_TX_ERROR);
        if (!dpaa_fq)
                goto fq_alloc_failed;

        port_fqs->tx_errq = &dpaa_fq[0];

        dpaa_fq = dpaa_fq_alloc(dev, 0, 1, list, FQ_TYPE_TX_CONFIRM);
        if (!dpaa_fq)
                goto fq_alloc_failed;

        port_fqs->tx_defq = &dpaa_fq[0];

        if (!dpaa_fq_alloc(dev, 0, DPAA_ETH_TXQ_NUM, list, FQ_TYPE_TX))
                goto fq_alloc_failed;

        return 0;

fq_alloc_failed:
        dev_err(dev, "dpaa_fq_alloc() failed\n");
        return -ENOMEM;
}

static u32 rx_pool_channel;
static DEFINE_SPINLOCK(rx_pool_channel_init);

static int dpaa_get_channel(void)
{
        spin_lock(&rx_pool_channel_init);
        if (!rx_pool_channel) {
                u32 pool;
                int ret;

                ret = qman_alloc_pool(&pool);

                if (!ret)
                        rx_pool_channel = pool;
        }
        spin_unlock(&rx_pool_channel_init);
        if (!rx_pool_channel)
                return -ENOMEM;
        return rx_pool_channel;
}

static void dpaa_release_channel(void)
{
        qman_release_pool(rx_pool_channel);
}

static void dpaa_eth_add_channel(u16 channel)
{
        u32 pool = QM_SDQCR_CHANNELS_POOL_CONV(channel);
        const cpumask_t *cpus = qman_affine_cpus();
        struct qman_portal *portal;
        int cpu;

        for_each_cpu_and(cpu, cpus, cpu_online_mask) {
                portal = qman_get_affine_portal(cpu);
                qman_p_static_dequeue_add(portal, pool);
        }
}

/* Congestion group state change notification callback.
 * Stops the device's egress queues while they are congested and
 * wakes them upon exiting congested state.
 * Also updates some CGR-related stats.
 */
static void dpaa_eth_cgscn(struct qman_portal *qm, struct qman_cgr *cgr,
                           int congested)
{
        struct dpaa_priv *priv = (struct dpaa_priv *)container_of(cgr,
                struct dpaa_priv, cgr_data.cgr);

        if (congested) {
                priv->cgr_data.congestion_start_jiffies = jiffies;
                netif_tx_stop_all_queues(priv->net_dev);
                priv->cgr_data.cgr_congested_count++;
        } else {
                priv->cgr_data.congested_jiffies +=
                        (jiffies - priv->cgr_data.congestion_start_jiffies);
                netif_tx_wake_all_queues(priv->net_dev);
        }
}

static int dpaa_eth_cgr_init(struct dpaa_priv *priv)
{
        struct qm_mcc_initcgr initcgr;
        u32 cs_th;
        int err;

        err = qman_alloc_cgrid(&priv->cgr_data.cgr.cgrid);
        if (err < 0) {
                if (netif_msg_drv(priv))
                        pr_err("%s: Error %d allocating CGR ID\n",
                               __func__, err);
                goto out_error;
        }
        priv->cgr_data.cgr.cb = dpaa_eth_cgscn;

        /* Enable Congestion State Change Notifications and CS taildrop */
        memset(&initcgr, 0, sizeof(initcgr));
        initcgr.we_mask = cpu_to_be16(QM_CGR_WE_CSCN_EN | QM_CGR_WE_CS_THRES);
        initcgr.cgr.cscn_en = QM_CGR_EN;

        /* Set different thresholds based on the MAC speed.
         * This may turn suboptimal if the MAC is reconfigured at a speed
         * lower than its max, e.g. if a dTSEC later negotiates a 100Mbps link.
         * In such cases, we ought to reconfigure the threshold, too.
         */
        if (priv->mac_dev->if_support & SUPPORTED_10000baseT_Full)
                cs_th = DPAA_CS_THRESHOLD_10G;
        else
                cs_th = DPAA_CS_THRESHOLD_1G;
        qm_cgr_cs_thres_set64(&initcgr.cgr.cs_thres, cs_th, 1);

        initcgr.we_mask |= cpu_to_be16(QM_CGR_WE_CSTD_EN);
        initcgr.cgr.cstd_en = QM_CGR_EN;

        err = qman_create_cgr(&priv->cgr_data.cgr, QMAN_CGR_FLAG_USE_INIT,
                              &initcgr);
        if (err < 0) {
                if (netif_msg_drv(priv))
                        pr_err("%s: Error %d creating CGR with ID %d\n",
                               __func__, err, priv->cgr_data.cgr.cgrid);
                qman_release_cgrid(priv->cgr_data.cgr.cgrid);
                goto out_error;
        }
        if (netif_msg_drv(priv))
                pr_debug("Created CGR %d for netdev with hwaddr %pM on QMan channel %d\n",
                         priv->cgr_data.cgr.cgrid, priv->mac_dev->addr,
                         priv->cgr_data.cgr.chan);

out_error:
        return err;
}

static inline void dpaa_setup_ingress(const struct dpaa_priv *priv,
                                      struct dpaa_fq *fq,
                                      const struct qman_fq *template)
{
        fq->fq_base = *template;
        fq->net_dev = priv->net_dev;

        fq->flags = QMAN_FQ_FLAG_NO_ENQUEUE;
        fq->channel = priv->channel;
}

static inline void dpaa_setup_egress(const struct dpaa_priv *priv,
                                     struct dpaa_fq *fq,
                                     struct fman_port *port,
                                     const struct qman_fq *template)
{
        fq->fq_base = *template;
        fq->net_dev = priv->net_dev;

        if (port) {
                fq->flags = QMAN_FQ_FLAG_TO_DCPORTAL;
                fq->channel = (u16)fman_port_get_qman_channel_id(port);
        } else {
                fq->flags = QMAN_FQ_FLAG_NO_MODIFY;
        }
}

static void dpaa_fq_setup(struct dpaa_priv *priv,
                          const struct dpaa_fq_cbs *fq_cbs,
                          struct fman_port *tx_port)
{
        int egress_cnt = 0, conf_cnt = 0, num_portals = 0, portal_cnt = 0, cpu;
        const cpumask_t *affine_cpus = qman_affine_cpus();
        u16 channels[NR_CPUS];
        struct dpaa_fq *fq;

        for_each_cpu_and(cpu, affine_cpus, cpu_online_mask)
                channels[num_portals++] = qman_affine_channel(cpu);

        if (num_portals == 0)
                dev_err(priv->net_dev->dev.parent,
                        "No Qman software (affine) channels found");

        /* Initialize each FQ in the list */
        list_for_each_entry(fq, &priv->dpaa_fq_list, list) {
                switch (fq->fq_type) {
                case FQ_TYPE_RX_DEFAULT:
                        dpaa_setup_ingress(priv, fq, &fq_cbs->rx_defq);
                        break;
                case FQ_TYPE_RX_ERROR:
                        dpaa_setup_ingress(priv, fq, &fq_cbs->rx_errq);
                        break;
                case FQ_TYPE_RX_PCD:
                        if (!num_portals)
                                continue;
                        dpaa_setup_ingress(priv, fq, &fq_cbs->rx_defq);
                        fq->channel = channels[portal_cnt++ % num_portals];
                        break;
                case FQ_TYPE_TX:
                        dpaa_setup_egress(priv, fq, tx_port,
                                          &fq_cbs->egress_ern);
                        /* If we have more Tx queues than the number of cores,
                         * just ignore the extra ones.
                         */
                        if (egress_cnt < DPAA_ETH_TXQ_NUM)
                                priv->egress_fqs[egress_cnt++] = &fq->fq_base;
                        break;
                case FQ_TYPE_TX_CONF_MQ:
                        priv->conf_fqs[conf_cnt++] = &fq->fq_base;
                        /* fall through */
                case FQ_TYPE_TX_CONFIRM:
                        dpaa_setup_ingress(priv, fq, &fq_cbs->tx_defq);
                        break;
                case FQ_TYPE_TX_ERROR:
                        dpaa_setup_ingress(priv, fq, &fq_cbs->tx_errq);
                        break;
                default:
                        dev_warn(priv->net_dev->dev.parent,
                                 "Unknown FQ type detected!\n");
                        break;
                }
        }

         /* Make sure all CPUs receive a corresponding Tx queue. */
        while (egress_cnt < DPAA_ETH_TXQ_NUM) {
                list_for_each_entry(fq, &priv->dpaa_fq_list, list) {
                        if (fq->fq_type != FQ_TYPE_TX)
                                continue;
                        priv->egress_fqs[egress_cnt++] = &fq->fq_base;
                        if (egress_cnt == DPAA_ETH_TXQ_NUM)
                                break;
                }
        }
}

static inline int dpaa_tx_fq_to_id(const struct dpaa_priv *priv,
                                   struct qman_fq *tx_fq)
{
        int i;

        for (i = 0; i < DPAA_ETH_TXQ_NUM; i++)
                if (priv->egress_fqs[i] == tx_fq)
                        return i;

        return -EINVAL;
}

static int dpaa_fq_init(struct dpaa_fq *dpaa_fq, bool td_enable)
{
        const struct dpaa_priv  *priv;
        struct qman_fq *confq = NULL;
        struct qm_mcc_initfq initfq;
        struct device *dev;
        struct qman_fq *fq;
        int queue_id;
        int err;

        priv = netdev_priv(dpaa_fq->net_dev);
        dev = dpaa_fq->net_dev->dev.parent;

        if (dpaa_fq->fqid == 0)
                dpaa_fq->flags |= QMAN_FQ_FLAG_DYNAMIC_FQID;

        dpaa_fq->init = !(dpaa_fq->flags & QMAN_FQ_FLAG_NO_MODIFY);

        err = qman_create_fq(dpaa_fq->fqid, dpaa_fq->flags, &dpaa_fq->fq_base);
        if (err) {
                dev_err(dev, "qman_create_fq() failed\n");
                return err;
        }
        fq = &dpaa_fq->fq_base;

        if (dpaa_fq->init) {
                memset(&initfq, 0, sizeof(initfq));

                initfq.we_mask = cpu_to_be16(QM_INITFQ_WE_FQCTRL);
                /* Note: we may get to keep an empty FQ in cache */
                initfq.fqd.fq_ctrl = cpu_to_be16(QM_FQCTRL_PREFERINCACHE);

                /* Try to reduce the number of portal interrupts for
                 * Tx Confirmation FQs.
                 */
                if (dpaa_fq->fq_type == FQ_TYPE_TX_CONFIRM)
                        initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_AVOIDBLOCK);

                /* FQ placement */
                initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_DESTWQ);

                qm_fqd_set_destwq(&initfq.fqd, dpaa_fq->channel, dpaa_fq->wq);

                /* Put all egress queues in a congestion group of their own.
                 * Sensu stricto, the Tx confirmation queues are Rx FQs,
                 * rather than Tx - but they nonetheless account for the
                 * memory footprint on behalf of egress traffic. We therefore
                 * place them in the netdev's CGR, along with the Tx FQs.
                 */
                if (dpaa_fq->fq_type == FQ_TYPE_TX ||
                    dpaa_fq->fq_type == FQ_TYPE_TX_CONFIRM ||
                    dpaa_fq->fq_type == FQ_TYPE_TX_CONF_MQ) {
                        initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_CGID);
                        initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_CGE);
                        initfq.fqd.cgid = (u8)priv->cgr_data.cgr.cgrid;
                        /* Set a fixed overhead accounting, in an attempt to
                         * reduce the impact of fixed-size skb shells and the
                         * driver's needed headroom on system memory. This is
                         * especially the case when the egress traffic is
                         * composed of small datagrams.
                         * Unfortunately, QMan's OAL value is capped to an
                         * insufficient value, but even that is better than
                         * no overhead accounting at all.
                         */
                        initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_OAC);
                        qm_fqd_set_oac(&initfq.fqd, QM_OAC_CG);
                        qm_fqd_set_oal(&initfq.fqd,
                                       min(sizeof(struct sk_buff) +
                                       priv->tx_headroom,
                                       (size_t)FSL_QMAN_MAX_OAL));
                }

                if (td_enable) {
                        initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_TDTHRESH);
                        qm_fqd_set_taildrop(&initfq.fqd, DPAA_FQ_TD, 1);
                        initfq.fqd.fq_ctrl = cpu_to_be16(QM_FQCTRL_TDE);
                }

                if (dpaa_fq->fq_type == FQ_TYPE_TX) {
                        queue_id = dpaa_tx_fq_to_id(priv, &dpaa_fq->fq_base);
                        if (queue_id >= 0)
                                confq = priv->conf_fqs[queue_id];
                        if (confq) {
                                initfq.we_mask |=
                                        cpu_to_be16(QM_INITFQ_WE_CONTEXTA);
                        /* ContextA: OVOM=1(use contextA2 bits instead of ICAD)
                         *           A2V=1 (contextA A2 field is valid)
                         *           A0V=1 (contextA A0 field is valid)
                         *           B0V=1 (contextB field is valid)
                         * ContextA A2: EBD=1 (deallocate buffers inside FMan)
                         * ContextB B0(ASPID): 0 (absolute Virtual Storage ID)
                         */
                                qm_fqd_context_a_set64(&initfq.fqd,
                                                       0x1e00000080000000ULL);
                        }
                }

                /* Put all the ingress queues in our "ingress CGR". */
                if (priv->use_ingress_cgr &&
                    (dpaa_fq->fq_type == FQ_TYPE_RX_DEFAULT ||
                     dpaa_fq->fq_type == FQ_TYPE_RX_ERROR ||
                     dpaa_fq->fq_type == FQ_TYPE_RX_PCD)) {
                        initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_CGID);
                        initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_CGE);
                        initfq.fqd.cgid = (u8)priv->ingress_cgr.cgrid;
                        /* Set a fixed overhead accounting, just like for the
                         * egress CGR.
                         */
                        initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_OAC);
                        qm_fqd_set_oac(&initfq.fqd, QM_OAC_CG);
                        qm_fqd_set_oal(&initfq.fqd,
                                       min(sizeof(struct sk_buff) +
                                       priv->tx_headroom,
                                       (size_t)FSL_QMAN_MAX_OAL));
                }

                /* Initialization common to all ingress queues */
                if (dpaa_fq->flags & QMAN_FQ_FLAG_NO_ENQUEUE) {
                        initfq.we_mask |= cpu_to_be16(QM_INITFQ_WE_CONTEXTA);
                        initfq.fqd.fq_ctrl |= cpu_to_be16(QM_FQCTRL_HOLDACTIVE |
                                                QM_FQCTRL_CTXASTASHING);
                        initfq.fqd.context_a.stashing.exclusive =
                                QM_STASHING_EXCL_DATA | QM_STASHING_EXCL_CTX |
                                QM_STASHING_EXCL_ANNOTATION;
                        qm_fqd_set_stashing(&initfq.fqd, 1, 2,
                                            DIV_ROUND_UP(sizeof(struct qman_fq),
                                                         64));
                }

                err = qman_init_fq(fq, QMAN_INITFQ_FLAG_SCHED, &initfq);
                if (err < 0) {
                        dev_err(dev, "qman_init_fq(%u) = %d\n",
                                qman_fq_fqid(fq), err);
                        qman_destroy_fq(fq);
                        return err;
                }
        }

        dpaa_fq->fqid = qman_fq_fqid(fq);

        return 0;
}

static int dpaa_fq_free_entry(struct device *dev, struct qman_fq *fq)
{
        const struct dpaa_priv  *priv;
        struct dpaa_fq *dpaa_fq;
        int err, error;

        err = 0;

        dpaa_fq = container_of(fq, struct dpaa_fq, fq_base);
        priv = netdev_priv(dpaa_fq->net_dev);

        if (dpaa_fq->init) {
                err = qman_retire_fq(fq, NULL);
                if (err < 0 && netif_msg_drv(priv))
                        dev_err(dev, "qman_retire_fq(%u) = %d\n",
                                qman_fq_fqid(fq), err);

                error = qman_oos_fq(fq);
                if (error < 0 && netif_msg_drv(priv)) {
                        dev_err(dev, "qman_oos_fq(%u) = %d\n",
                                qman_fq_fqid(fq), error);
                        if (err >= 0)
                                err = error;
                }
        }

        qman_destroy_fq(fq);
        list_del(&dpaa_fq->list);

        return err;
}

static int dpaa_fq_free(struct device *dev, struct list_head *list)
{
        struct dpaa_fq *dpaa_fq, *tmp;
        int err, error;

        err = 0;
        list_for_each_entry_safe(dpaa_fq, tmp, list, list) {
                error = dpaa_fq_free_entry(dev, (struct qman_fq *)dpaa_fq);
                if (error < 0 && err >= 0)
                        err = error;
        }

        return err;
}

static int dpaa_eth_init_tx_port(struct fman_port *port, struct dpaa_fq *errq,
                                 struct dpaa_fq *defq,
                                 struct dpaa_buffer_layout *buf_layout)
{
        struct fman_buffer_prefix_content buf_prefix_content;
        struct fman_port_params params;
        int err;

        memset(&params, 0, sizeof(params));
        memset(&buf_prefix_content, 0, sizeof(buf_prefix_content));

        buf_prefix_content.priv_data_size = buf_layout->priv_data_size;
        buf_prefix_content.pass_prs_result = true;
        buf_prefix_content.pass_hash_result = true;
        buf_prefix_content.pass_time_stamp = true;
        buf_prefix_content.data_align = DPAA_FD_DATA_ALIGNMENT;

        params.specific_params.non_rx_params.err_fqid = errq->fqid;
        params.specific_params.non_rx_params.dflt_fqid = defq->fqid;

        err = fman_port_config(port, &params);
        if (err) {
                pr_err("%s: fman_port_config failed\n", __func__);
                return err;
        }

        err = fman_port_cfg_buf_prefix_content(port, &buf_prefix_content);
        if (err) {
                pr_err("%s: fman_port_cfg_buf_prefix_content failed\n",
                       __func__);
                return err;
        }

        err = fman_port_init(port);
        if (err)
                pr_err("%s: fm_port_init failed\n", __func__);

        return err;
}

static int dpaa_eth_init_rx_port(struct fman_port *port, struct dpaa_bp **bps,
                                 size_t count, struct dpaa_fq *errq,
                                 struct dpaa_fq *defq, struct dpaa_fq *pcdq,
                                 struct dpaa_buffer_layout *buf_layout)
{
        struct fman_buffer_prefix_content buf_prefix_content;
        struct fman_port_rx_params *rx_p;
        struct fman_port_params params;
        int i, err;

        memset(&params, 0, sizeof(params));
        memset(&buf_prefix_content, 0, sizeof(buf_prefix_content));

        buf_prefix_content.priv_data_size = buf_layout->priv_data_size;
        buf_prefix_content.pass_prs_result = true;
        buf_prefix_content.pass_hash_result = true;
        buf_prefix_content.pass_time_stamp = true;
        buf_prefix_content.data_align = DPAA_FD_DATA_ALIGNMENT;

        rx_p = &params.specific_params.rx_params;
        rx_p->err_fqid = errq->fqid;
        rx_p->dflt_fqid = defq->fqid;
        if (pcdq) {
                rx_p->pcd_base_fqid = pcdq->fqid;
                rx_p->pcd_fqs_count = DPAA_ETH_PCD_RXQ_NUM;
        }

        count = min(ARRAY_SIZE(rx_p->ext_buf_pools.ext_buf_pool), count);
        rx_p->ext_buf_pools.num_of_pools_used = (u8)count;
        for (i = 0; i < count; i++) {
                rx_p->ext_buf_pools.ext_buf_pool[i].id =  bps[i]->bpid;
                rx_p->ext_buf_pools.ext_buf_pool[i].size = (u16)bps[i]->size;
        }

        err = fman_port_config(port, &params);
        if (err) {
                pr_err("%s: fman_port_config failed\n", __func__);
                return err;
        }

        err = fman_port_cfg_buf_prefix_content(port, &buf_prefix_content);
        if (err) {
                pr_err("%s: fman_port_cfg_buf_prefix_content failed\n",
                       __func__);
                return err;
        }

        err = fman_port_init(port);
        if (err)
                pr_err("%s: fm_port_init failed\n", __func__);

        return err;
}

static int dpaa_eth_init_ports(struct mac_device *mac_dev,
                               struct dpaa_bp **bps, size_t count,
                               struct fm_port_fqs *port_fqs,
                               struct dpaa_buffer_layout *buf_layout,
                               struct device *dev)
{
        struct fman_port *rxport = mac_dev->port[RX];
        struct fman_port *txport = mac_dev->port[TX];
        int err;

        err = dpaa_eth_init_tx_port(txport, port_fqs->tx_errq,
                                    port_fqs->tx_defq, &buf_layout[TX]);
        if (err)
                return err;

        err = dpaa_eth_init_rx_port(rxport, bps, count, port_fqs->rx_errq,
                                    port_fqs->rx_defq, port_fqs->rx_pcdq,
                                    &buf_layout[RX]);

        return err;
}

static int dpaa_bman_release(const struct dpaa_bp *dpaa_bp,
                             struct bm_buffer *bmb, int cnt)
{
        int err;

        err = bman_release(dpaa_bp->pool, bmb, cnt);
        /* Should never occur, address anyway to avoid leaking the buffers */
        if (WARN_ON(err) && dpaa_bp->free_buf_cb)
                while (cnt-- > 0)
                        dpaa_bp->free_buf_cb(dpaa_bp, &bmb[cnt]);

        return cnt;
}

static void dpaa_release_sgt_members(struct qm_sg_entry *sgt)
{
        struct bm_buffer bmb[DPAA_BUFF_RELEASE_MAX];
        struct dpaa_bp *dpaa_bp;
        int i = 0, j;

        memset(bmb, 0, sizeof(bmb));

        do {
                dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
                if (!dpaa_bp)
                        return;

                j = 0;
                do {
                        WARN_ON(qm_sg_entry_is_ext(&sgt[i]));

                        bm_buffer_set64(&bmb[j], qm_sg_entry_get64(&sgt[i]));

                        j++; i++;
                } while (j < ARRAY_SIZE(bmb) &&
                                !qm_sg_entry_is_final(&sgt[i - 1]) &&
                                sgt[i - 1].bpid == sgt[i].bpid);

                dpaa_bman_release(dpaa_bp, bmb, j);
        } while (!qm_sg_entry_is_final(&sgt[i - 1]));
}

static void dpaa_fd_release(const struct net_device *net_dev,
                            const struct qm_fd *fd)
{
        struct qm_sg_entry *sgt;
        struct dpaa_bp *dpaa_bp;
        struct bm_buffer bmb;
        dma_addr_t addr;
        void *vaddr;

        bmb.data = 0;
        bm_buffer_set64(&bmb, qm_fd_addr(fd));

        dpaa_bp = dpaa_bpid2pool(fd->bpid);
        if (!dpaa_bp)
                return;

        if (qm_fd_get_format(fd) == qm_fd_sg) {
                vaddr = phys_to_virt(qm_fd_addr(fd));
                sgt = vaddr + qm_fd_get_offset(fd);

                dma_unmap_single(dpaa_bp->dev, qm_fd_addr(fd), dpaa_bp->size,
                                 DMA_FROM_DEVICE);

                dpaa_release_sgt_members(sgt);

                addr = dma_map_single(dpaa_bp->dev, vaddr, dpaa_bp->size,
                                      DMA_FROM_DEVICE);
                if (dma_mapping_error(dpaa_bp->dev, addr)) {
                        dev_err(dpaa_bp->dev, "DMA mapping failed");
                        return;
                }
                bm_buffer_set64(&bmb, addr);
        }

        dpaa_bman_release(dpaa_bp, &bmb, 1);
}

static void count_ern(struct dpaa_percpu_priv *percpu_priv,
                      const union qm_mr_entry *msg)
{
        switch (msg->ern.rc & QM_MR_RC_MASK) {
        case QM_MR_RC_CGR_TAILDROP:
                percpu_priv->ern_cnt.cg_tdrop++;
                break;
        case QM_MR_RC_WRED:
                percpu_priv->ern_cnt.wred++;
                break;
        case QM_MR_RC_ERROR:
                percpu_priv->ern_cnt.err_cond++;
                break;
        case QM_MR_RC_ORPWINDOW_EARLY:
                percpu_priv->ern_cnt.early_window++;
                break;
        case QM_MR_RC_ORPWINDOW_LATE:
                percpu_priv->ern_cnt.late_window++;
                break;
        case QM_MR_RC_FQ_TAILDROP:
                percpu_priv->ern_cnt.fq_tdrop++;
                break;
        case QM_MR_RC_ORPWINDOW_RETIRED:
                percpu_priv->ern_cnt.fq_retired++;
                break;
        case QM_MR_RC_ORP_ZERO:
                percpu_priv->ern_cnt.orp_zero++;
                break;
        }
}

/* Turn on HW checksum computation for this outgoing frame.
 * If the current protocol is not something we support in this regard
 * (or if the stack has already computed the SW checksum), we do nothing.
 *
 * Returns 0 if all goes well (or HW csum doesn't apply), and a negative value
 * otherwise.
 *
 * Note that this function may modify the fd->cmd field and the skb data buffer
 * (the Parse Results area).
 */
static int dpaa_enable_tx_csum(struct dpaa_priv *priv,
                               struct sk_buff *skb,
                               struct qm_fd *fd,
                               char *parse_results)
{
        struct fman_prs_result *parse_result;
        u16 ethertype = ntohs(skb->protocol);
        struct ipv6hdr *ipv6h = NULL;
        struct iphdr *iph;
        int retval = 0;
        u8 l4_proto;

        if (skb->ip_summed != CHECKSUM_PARTIAL)
                return 0;

        /* Note: L3 csum seems to be already computed in sw, but we can't choose
         * L4 alone from the FM configuration anyway.
         */

        /* Fill in some fields of the Parse Results array, so the FMan
         * can find them as if they came from the FMan Parser.
         */
        parse_result = (struct fman_prs_result *)parse_results;

        /* If we're dealing with VLAN, get the real Ethernet type */
        if (ethertype == ETH_P_8021Q) {
                /* We can't always assume the MAC header is set correctly
                 * by the stack, so reset to beginning of skb->data
                 */
                skb_reset_mac_header(skb);
                ethertype = ntohs(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto);
        }

        /* Fill in the relevant L3 parse result fields
         * and read the L4 protocol type
         */
        switch (ethertype) {
        case ETH_P_IP:
                parse_result->l3r = cpu_to_be16(FM_L3_PARSE_RESULT_IPV4);
                iph = ip_hdr(skb);
                WARN_ON(!iph);
                l4_proto = iph->protocol;
                break;
        case ETH_P_IPV6:
                parse_result->l3r = cpu_to_be16(FM_L3_PARSE_RESULT_IPV6);
                ipv6h = ipv6_hdr(skb);
                WARN_ON(!ipv6h);
                l4_proto = ipv6h->nexthdr;
                break;
        default:
                /* We shouldn't even be here */
                if (net_ratelimit())
                        netif_alert(priv, tx_err, priv->net_dev,
                                    "Can't compute HW csum for L3 proto 0x%x\n",
                                    ntohs(skb->protocol));
                retval = -EIO;
                goto return_error;
        }

        /* Fill in the relevant L4 parse result fields */
        switch (l4_proto) {
        case IPPROTO_UDP:
                parse_result->l4r = FM_L4_PARSE_RESULT_UDP;
                break;
        case IPPROTO_TCP:
                parse_result->l4r = FM_L4_PARSE_RESULT_TCP;
                break;
        default:
                if (net_ratelimit())
                        netif_alert(priv, tx_err, priv->net_dev,
                                    "Can't compute HW csum for L4 proto 0x%x\n",
                                    l4_proto);
                retval = -EIO;
                goto return_error;
        }

        /* At index 0 is IPOffset_1 as defined in the Parse Results */
        parse_result->ip_off[0] = (u8)skb_network_offset(skb);
        parse_result->l4_off = (u8)skb_transport_offset(skb);

        /* Enable L3 (and L4, if TCP or UDP) HW checksum. */
        fd->cmd |= cpu_to_be32(FM_FD_CMD_RPD | FM_FD_CMD_DTC);

        /* On P1023 and similar platforms fd->cmd interpretation could
         * be disabled by setting CONTEXT_A bit ICMD; currently this bit
         * is not set so we do not need to check; in the future, if/when
         * using context_a we need to check this bit
         */

return_error:
        return retval;
}

static int dpaa_bp_add_8_bufs(const struct dpaa_bp *dpaa_bp)
{
        struct device *dev = dpaa_bp->dev;
        struct bm_buffer bmb[8];
        dma_addr_t addr;
        void *new_buf;
        u8 i;

        for (i = 0; i < 8; i++) {
                new_buf = netdev_alloc_frag(dpaa_bp->raw_size);
                if (unlikely(!new_buf)) {
                        dev_err(dev, "netdev_alloc_frag() failed, size %zu\n",
                                dpaa_bp->raw_size);
                        goto release_previous_buffs;
                }
                new_buf = PTR_ALIGN(new_buf, SMP_CACHE_BYTES);

                addr = dma_map_single(dev, new_buf,
                                      dpaa_bp->size, DMA_FROM_DEVICE);
                if (unlikely(dma_mapping_error(dev, addr))) {
                        dev_err(dpaa_bp->dev, "DMA map failed");
                        goto release_previous_buffs;
                }

                bmb[i].data = 0;
                bm_buffer_set64(&bmb[i], addr);
        }

release_bufs:
        return dpaa_bman_release(dpaa_bp, bmb, i);

release_previous_buffs:
        WARN_ONCE(1, "dpaa_eth: failed to add buffers on Rx\n");

        bm_buffer_set64(&bmb[i], 0);
        /* Avoid releasing a completely null buffer; bman_release() requires
         * at least one buffer.
         */
        if (likely(i))
                goto release_bufs;

        return 0;
}

static int dpaa_bp_seed(struct dpaa_bp *dpaa_bp)
{
        int i;

        /* Give each CPU an allotment of "config_count" buffers */
        for_each_possible_cpu(i) {
                int *count_ptr = per_cpu_ptr(dpaa_bp->percpu_count, i);
                int j;

                /* Although we access another CPU's counters here
                 * we do it at boot time so it is safe
                 */
                for (j = 0; j < dpaa_bp->config_count; j += 8)
                        *count_ptr += dpaa_bp_add_8_bufs(dpaa_bp);
        }
        return 0;
}

/* Add buffers/(pages) for Rx processing whenever bpool count falls below
 * REFILL_THRESHOLD.
 */
static int dpaa_eth_refill_bpool(struct dpaa_bp *dpaa_bp, int *countptr)
{
        int count = *countptr;
        int new_bufs;

        if (unlikely(count < FSL_DPAA_ETH_REFILL_THRESHOLD)) {
                do {
                        new_bufs = dpaa_bp_add_8_bufs(dpaa_bp);
                        if (unlikely(!new_bufs)) {
                                /* Avoid looping forever if we've temporarily
                                 * run out of memory. We'll try again at the
                                 * next NAPI cycle.
                                 */
                                break;
                        }
                        count += new_bufs;
                } while (count < FSL_DPAA_ETH_MAX_BUF_COUNT);

                *countptr = count;
                if (unlikely(count < FSL_DPAA_ETH_MAX_BUF_COUNT))
                        return -ENOMEM;
        }

        return 0;
}

static int dpaa_eth_refill_bpools(struct dpaa_priv *priv)
{
        struct dpaa_bp *dpaa_bp;
        int *countptr;
        int res, i;

        for (i = 0; i < DPAA_BPS_NUM; i++) {
                dpaa_bp = priv->dpaa_bps[i];
                if (!dpaa_bp)
                        return -EINVAL;
                countptr = this_cpu_ptr(dpaa_bp->percpu_count);
                res  = dpaa_eth_refill_bpool(dpaa_bp, countptr);
                if (res)
                        return res;
        }
        return 0;
}

/* Cleanup function for outgoing frame descriptors that were built on Tx path,
 * either contiguous frames or scatter/gather ones.
 * Skb freeing is not handled here.
 *
 * This function may be called on error paths in the Tx function, so guard
 * against cases when not all fd relevant fields were filled in.
 *
 * Return the skb backpointer, since for S/G frames the buffer containing it
 * gets freed here.
 */
static struct sk_buff *dpaa_cleanup_tx_fd(const struct dpaa_priv *priv,
                                          const struct qm_fd *fd)
{
        const enum dma_data_direction dma_dir = DMA_TO_DEVICE;
        struct device *dev = priv->net_dev->dev.parent;
        struct skb_shared_hwtstamps shhwtstamps;
        dma_addr_t addr = qm_fd_addr(fd);
        const struct qm_sg_entry *sgt;
        struct sk_buff **skbh, *skb;
        int nr_frags, i;
        u64 ns;

        skbh = (struct sk_buff **)phys_to_virt(addr);
        skb = *skbh;

        if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
                memset(&shhwtstamps, 0, sizeof(shhwtstamps));

                if (!fman_port_get_tstamp(priv->mac_dev->port[TX], (void *)skbh,
                                          &ns)) {
                        shhwtstamps.hwtstamp = ns_to_ktime(ns);
                        skb_tstamp_tx(skb, &shhwtstamps);
                } else {
                        dev_warn(dev, "fman_port_get_tstamp failed!\n");
                }
        }

        if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) {
                nr_frags = skb_shinfo(skb)->nr_frags;
                dma_unmap_single(dev, addr,
                                 qm_fd_get_offset(fd) + DPAA_SGT_SIZE,
                                 dma_dir);

                /* The sgt buffer has been allocated with netdev_alloc_frag(),
                 * it's from lowmem.
                 */
                sgt = phys_to_virt(addr + qm_fd_get_offset(fd));

                /* sgt[0] is from lowmem, was dma_map_single()-ed */
                dma_unmap_single(dev, qm_sg_addr(&sgt[0]),
                                 qm_sg_entry_get_len(&sgt[0]), dma_dir);

                /* remaining pages were mapped with skb_frag_dma_map() */
                for (i = 1; i <= nr_frags; i++) {
                        WARN_ON(qm_sg_entry_is_ext(&sgt[i]));

                        dma_unmap_page(dev, qm_sg_addr(&sgt[i]),
                                       qm_sg_entry_get_len(&sgt[i]), dma_dir);
                }

                /* Free the page frag that we allocated on Tx */
                skb_free_frag(phys_to_virt(addr));
        } else {
                dma_unmap_single(dev, addr,
                                 skb_tail_pointer(skb) - (u8 *)skbh, dma_dir);
        }

        return skb;
}

static u8 rx_csum_offload(const struct dpaa_priv *priv, const struct qm_fd *fd)
{
        /* The parser has run and performed L4 checksum validation.
         * We know there were no parser errors (and implicitly no
         * L4 csum error), otherwise we wouldn't be here.
         */
        if ((priv->net_dev->features & NETIF_F_RXCSUM) &&
            (be32_to_cpu(fd->status) & FM_FD_STAT_L4CV))
                return CHECKSUM_UNNECESSARY;

        /* We're here because either the parser didn't run or the L4 checksum
         * was not verified. This may include the case of a UDP frame with
         * checksum zero or an L4 proto other than TCP/UDP
         */
        return CHECKSUM_NONE;
}

/* Build a linear skb around the received buffer.
 * We are guaranteed there is enough room at the end of the data buffer to
 * accommodate the shared info area of the skb.
 */
static struct sk_buff *contig_fd_to_skb(const struct dpaa_priv *priv,
                                        const struct qm_fd *fd)
{
        ssize_t fd_off = qm_fd_get_offset(fd);
        dma_addr_t addr = qm_fd_addr(fd);
        struct dpaa_bp *dpaa_bp;
        struct sk_buff *skb;
        void *vaddr;

        vaddr = phys_to_virt(addr);
        WARN_ON(!IS_ALIGNED((unsigned long)vaddr, SMP_CACHE_BYTES));

        dpaa_bp = dpaa_bpid2pool(fd->bpid);
        if (!dpaa_bp)
                goto free_buffer;

        skb = build_skb(vaddr, dpaa_bp->size +
                        SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
        if (WARN_ONCE(!skb, "Build skb failure on Rx\n"))
                goto free_buffer;
        WARN_ON(fd_off != priv->rx_headroom);
        skb_reserve(skb, fd_off);
        skb_put(skb, qm_fd_get_length(fd));

        skb->ip_summed = rx_csum_offload(priv, fd);

        return skb;

free_buffer:
        skb_free_frag(vaddr);
        return NULL;
}

/* Build an skb with the data of the first S/G entry in the linear portion and
 * the rest of the frame as skb fragments.
 *
 * The page fragment holding the S/G Table is recycled here.
 */
static struct sk_buff *sg_fd_to_skb(const struct dpaa_priv *priv,
                                    const struct qm_fd *fd)
{
        ssize_t fd_off = qm_fd_get_offset(fd);
        dma_addr_t addr = qm_fd_addr(fd);
        const struct qm_sg_entry *sgt;
        struct page *page, *head_page;
        struct dpaa_bp *dpaa_bp;
        void *vaddr, *sg_vaddr;
        int frag_off, frag_len;
        struct sk_buff *skb;
        dma_addr_t sg_addr;
        int page_offset;
        unsigned int sz;
        int *count_ptr;
        int i;

        vaddr = phys_to_virt(addr);
        WARN_ON(!IS_ALIGNED((unsigned long)vaddr, SMP_CACHE_BYTES));

        /* Iterate through the SGT entries and add data buffers to the skb */
        sgt = vaddr + fd_off;
        skb = NULL;
        for (i = 0; i < DPAA_SGT_MAX_ENTRIES; i++) {
                /* Extension bit is not supported */
                WARN_ON(qm_sg_entry_is_ext(&sgt[i]));

                sg_addr = qm_sg_addr(&sgt[i]);
                sg_vaddr = phys_to_virt(sg_addr);
                WARN_ON(!IS_ALIGNED((unsigned long)sg_vaddr,
                                    SMP_CACHE_BYTES));

                /* We may use multiple Rx pools */
                dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
                if (!dpaa_bp)
                        goto free_buffers;

                count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
                dma_unmap_single(dpaa_bp->dev, sg_addr, dpaa_bp->size,
                                 DMA_FROM_DEVICE);
                if (!skb) {
                        sz = dpaa_bp->size +
                                SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
                        skb = build_skb(sg_vaddr, sz);
                        if (WARN_ON(!skb))
                                goto free_buffers;

                        skb->ip_summed = rx_csum_offload(priv, fd);

                        /* Make sure forwarded skbs will have enough space
                         * on Tx, if extra headers are added.
                         */
                        WARN_ON(fd_off != priv->rx_headroom);
                        skb_reserve(skb, fd_off);
                        skb_put(skb, qm_sg_entry_get_len(&sgt[i]));
                } else {
                        /* Not the first S/G entry; all data from buffer will
                         * be added in an skb fragment; fragment index is offset
                         * by one since first S/G entry was incorporated in the
                         * linear part of the skb.
                         *
                         * Caution: 'page' may be a tail page.
                         */
                        page = virt_to_page(sg_vaddr);
                        head_page = virt_to_head_page(sg_vaddr);

                        /* Compute offset in (possibly tail) page */
                        page_offset = ((unsigned long)sg_vaddr &
                                        (PAGE_SIZE - 1)) +
                                (page_address(page) - page_address(head_page));
                        /* page_offset only refers to the beginning of sgt[i];
                         * but the buffer itself may have an internal offset.
                         */
                        frag_off = qm_sg_entry_get_off(&sgt[i]) + page_offset;
                        frag_len = qm_sg_entry_get_len(&sgt[i]);
                        /* skb_add_rx_frag() does no checking on the page; if
                         * we pass it a tail page, we'll end up with
                         * bad page accounting and eventually with segafults.
                         */
                        skb_add_rx_frag(skb, i - 1, head_page, frag_off,
                                        frag_len, dpaa_bp->size);
                }
                /* Update the pool count for the current {cpu x bpool} */
                (*count_ptr)--;

                if (qm_sg_entry_is_final(&sgt[i]))
                        break;
        }
        WARN_ONCE(i == DPAA_SGT_MAX_ENTRIES, "No final bit on SGT\n");

        /* free the SG table buffer */
        skb_free_frag(vaddr);

        return skb;

free_buffers:
        /* compensate sw bpool counter changes */
        for (i--; i >= 0; i--) {
                dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
                if (dpaa_bp) {
                        count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
                        (*count_ptr)++;
                }
        }
        /* free all the SG entries */
        for (i = 0; i < DPAA_SGT_MAX_ENTRIES ; i++) {
                sg_addr = qm_sg_addr(&sgt[i]);
                sg_vaddr = phys_to_virt(sg_addr);
                skb_free_frag(sg_vaddr);
                dpaa_bp = dpaa_bpid2pool(sgt[i].bpid);
                if (dpaa_bp) {
                        count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
                        (*count_ptr)--;
                }

                if (qm_sg_entry_is_final(&sgt[i]))
                        break;
        }
        /* free the SGT fragment */
        skb_free_frag(vaddr);

        return NULL;
}

static int skb_to_contig_fd(struct dpaa_priv *priv,
                            struct sk_buff *skb, struct qm_fd *fd,
                            int *offset)
{
        struct net_device *net_dev = priv->net_dev;
        struct device *dev = net_dev->dev.parent;
        enum dma_data_direction dma_dir;
        unsigned char *buffer_start;
        struct sk_buff **skbh;
        dma_addr_t addr;
        int err;

        /* We are guaranteed to have at least tx_headroom bytes
         * available, so just use that for offset.
         */
        fd->bpid = FSL_DPAA_BPID_INV;
        buffer_start = skb->data - priv->tx_headroom;
        dma_dir = DMA_TO_DEVICE;

        skbh = (struct sk_buff **)buffer_start;
        *skbh = skb;

        /* Enable L3/L4 hardware checksum computation.
         *
         * We must do this before dma_map_single(DMA_TO_DEVICE), because we may
         * need to write into the skb.
         */
        err = dpaa_enable_tx_csum(priv, skb, fd,
                                  ((char *)skbh) + DPAA_TX_PRIV_DATA_SIZE);
        if (unlikely(err < 0)) {
                if (net_ratelimit())
                        netif_err(priv, tx_err, net_dev, "HW csum error: %d\n",
                                  err);
                return err;
        }

        /* Fill in the rest of the FD fields */
        qm_fd_set_contig(fd, priv->tx_headroom, skb->len);
        fd->cmd |= cpu_to_be32(FM_FD_CMD_FCO);

        /* Map the entire buffer size that may be seen by FMan, but no more */
        addr = dma_map_single(dev, skbh,
                              skb_tail_pointer(skb) - buffer_start, dma_dir);
        if (unlikely(dma_mapping_error(dev, addr))) {
                if (net_ratelimit())
                        netif_err(priv, tx_err, net_dev, "dma_map_single() failed\n");
                return -EINVAL;
        }
        qm_fd_addr_set64(fd, addr);

        return 0;
}

static int skb_to_sg_fd(struct dpaa_priv *priv,
                        struct sk_buff *skb, struct qm_fd *fd)
{
        const enum dma_data_direction dma_dir = DMA_TO_DEVICE;
        const int nr_frags = skb_shinfo(skb)->nr_frags;
        struct net_device *net_dev = priv->net_dev;
        struct device *dev = net_dev->dev.parent;
        struct qm_sg_entry *sgt;
        struct sk_buff **skbh;
        int i, j, err, sz;
        void *buffer_start;
        skb_frag_t *frag;
        dma_addr_t addr;
        size_t frag_len;
        void *sgt_buf;

        /* get a page frag to store the SGTable */
        sz = SKB_DATA_ALIGN(priv->tx_headroom + DPAA_SGT_SIZE);
        sgt_buf = netdev_alloc_frag(sz);
        if (unlikely(!sgt_buf)) {
                netdev_err(net_dev, "netdev_alloc_frag() failed for size %d\n",
                           sz);
                return -ENOMEM;
        }

        /* Enable L3/L4 hardware checksum computation.
         *
         * We must do this before dma_map_single(DMA_TO_DEVICE), because we may
         * need to write into the skb.
         */
        err = dpaa_enable_tx_csum(priv, skb, fd,
                                  sgt_buf + DPAA_TX_PRIV_DATA_SIZE);
        if (unlikely(err < 0)) {
                if (net_ratelimit())
                        netif_err(priv, tx_err, net_dev, "HW csum error: %d\n",
                                  err);
                goto csum_failed;
        }

        /* SGT[0] is used by the linear part */
        sgt = (struct qm_sg_entry *)(sgt_buf + priv->tx_headroom);
        frag_len = skb_headlen(skb);
        qm_sg_entry_set_len(&sgt[0], frag_len);
        sgt[0].bpid = FSL_DPAA_BPID_INV;
        sgt[0].offset = 0;
        addr = dma_map_single(dev, skb->data,
                              skb_headlen(skb), dma_dir);
        if (unlikely(dma_mapping_error(dev, addr))) {
                dev_err(dev, "DMA mapping failed");
                err = -EINVAL;
                goto sg0_map_failed;
        }
        qm_sg_entry_set64(&sgt[0], addr);

        /* populate the rest of SGT entries */
        for (i = 0; i < nr_frags; i++) {
                frag = &skb_shinfo(skb)->frags[i];
                frag_len = frag->size;
                WARN_ON(!skb_frag_page(frag));
                addr = skb_frag_dma_map(dev, frag, 0,
                                        frag_len, dma_dir);
                if (unlikely(dma_mapping_error(dev, addr))) {
                        dev_err(dev, "DMA mapping failed");
                        err = -EINVAL;
                        goto sg_map_failed;
                }

                qm_sg_entry_set_len(&sgt[i + 1], frag_len);
                sgt[i + 1].bpid = FSL_DPAA_BPID_INV;
                sgt[i + 1].offset = 0;

                /* keep the offset in the address */
                qm_sg_entry_set64(&sgt[i + 1], addr);
        }

        /* Set the final bit in the last used entry of the SGT */
        qm_sg_entry_set_f(&sgt[nr_frags], frag_len);

        qm_fd_set_sg(fd, priv->tx_headroom, skb->len);

        /* DMA map the SGT page */
        buffer_start = (void *)sgt - priv->tx_headroom;
        skbh = (struct sk_buff **)buffer_start;
        *skbh = skb;

        addr = dma_map_single(dev, buffer_start,
                              priv->tx_headroom + DPAA_SGT_SIZE, dma_dir);
        if (unlikely(dma_mapping_error(dev, addr))) {
                dev_err(dev, "DMA mapping failed");
                err = -EINVAL;
                goto sgt_map_failed;
        }

        fd->bpid = FSL_DPAA_BPID_INV;
        fd->cmd |= cpu_to_be32(FM_FD_CMD_FCO);
        qm_fd_addr_set64(fd, addr);

        return 0;

sgt_map_failed:
sg_map_failed:
        for (j = 0; j < i; j++)
                dma_unmap_page(dev, qm_sg_addr(&sgt[j]),
                               qm_sg_entry_get_len(&sgt[j]), dma_dir);
sg0_map_failed:
csum_failed:
        skb_free_frag(sgt_buf);

        return err;
}

static inline int dpaa_xmit(struct dpaa_priv *priv,
                            struct rtnl_link_stats64 *percpu_stats,
                            int queue,
                            struct qm_fd *fd)
{
        struct qman_fq *egress_fq;
        int err, i;

        egress_fq = priv->egress_fqs[queue];
        if (fd->bpid == FSL_DPAA_BPID_INV)
                fd->cmd |= cpu_to_be32(qman_fq_fqid(priv->conf_fqs[queue]));

        /* Trace this Tx fd */
        trace_dpaa_tx_fd(priv->net_dev, egress_fq, fd);

        for (i = 0; i < DPAA_ENQUEUE_RETRIES; i++) {
                err = qman_enqueue(egress_fq, fd);
                if (err != -EBUSY)
                        break;
        }

        if (unlikely(err < 0)) {
                percpu_stats->tx_fifo_errors++;
                return err;
        }

        percpu_stats->tx_packets++;
        percpu_stats->tx_bytes += qm_fd_get_length(fd);

        return 0;
}

static netdev_tx_t
dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
{
        const int queue_mapping = skb_get_queue_mapping(skb);
        bool nonlinear = skb_is_nonlinear(skb);
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa_percpu_priv *percpu_priv;
        struct netdev_queue *txq;
        struct dpaa_priv *priv;
        struct qm_fd fd;
        int offset = 0;
        int err = 0;

        priv = netdev_priv(net_dev);
        percpu_priv = this_cpu_ptr(priv->percpu_priv);
        percpu_stats = &percpu_priv->stats;

        qm_fd_clear_fd(&fd);

        if (!nonlinear) {
                /* We're going to store the skb backpointer at the beginning
                 * of the data buffer, so we need a privately owned skb
                 *
                 * We've made sure skb is not shared in dev->priv_flags,
                 * we need to verify the skb head is not cloned
                 */
                if (skb_cow_head(skb, priv->tx_headroom))
                        goto enomem;

                WARN_ON(skb_is_nonlinear(skb));
        }

        /* MAX_SKB_FRAGS is equal or larger than our dpaa_SGT_MAX_ENTRIES;
         * make sure we don't feed FMan with more fragments than it supports.
         */
        if (unlikely(nonlinear &&
                     (skb_shinfo(skb)->nr_frags >= DPAA_SGT_MAX_ENTRIES))) {
                /* If the egress skb contains more fragments than we support
                 * we have no choice but to linearize it ourselves.
                 */
                if (__skb_linearize(skb))
                        goto enomem;

                nonlinear = skb_is_nonlinear(skb);
        }

        if (nonlinear) {
                /* Just create a S/G fd based on the skb */
                err = skb_to_sg_fd(priv, skb, &fd);
                percpu_priv->tx_frag_skbuffs++;
        } else {
                /* Create a contig FD from this skb */
                err = skb_to_contig_fd(priv, skb, &fd, &offset);
        }
        if (unlikely(err < 0))
                goto skb_to_fd_failed;

        txq = netdev_get_tx_queue(net_dev, queue_mapping);

        /* LLTX requires to do our own update of trans_start */
        txq->trans_start = jiffies;

        if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
                fd.cmd |= cpu_to_be32(FM_FD_CMD_UPD);
                skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
        }

        if (likely(dpaa_xmit(priv, percpu_stats, queue_mapping, &fd) == 0))
                return NETDEV_TX_OK;

        dpaa_cleanup_tx_fd(priv, &fd);
skb_to_fd_failed:
enomem:
        percpu_stats->tx_errors++;
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
}

static void dpaa_rx_error(struct net_device *net_dev,
                          const struct dpaa_priv *priv,
                          struct dpaa_percpu_priv *percpu_priv,
                          const struct qm_fd *fd,
                          u32 fqid)
{
        if (net_ratelimit())
                netif_err(priv, hw, net_dev, "Err FD status = 0x%08x\n",
                          be32_to_cpu(fd->status) & FM_FD_STAT_RX_ERRORS);

        percpu_priv->stats.rx_errors++;

        if (be32_to_cpu(fd->status) & FM_FD_ERR_DMA)
                percpu_priv->rx_errors.dme++;
        if (be32_to_cpu(fd->status) & FM_FD_ERR_PHYSICAL)
                percpu_priv->rx_errors.fpe++;
        if (be32_to_cpu(fd->status) & FM_FD_ERR_SIZE)
                percpu_priv->rx_errors.fse++;
        if (be32_to_cpu(fd->status) & FM_FD_ERR_PRS_HDR_ERR)
                percpu_priv->rx_errors.phe++;

        dpaa_fd_release(net_dev, fd);
}

static void dpaa_tx_error(struct net_device *net_dev,
                          const struct dpaa_priv *priv,
                          struct dpaa_percpu_priv *percpu_priv,
                          const struct qm_fd *fd,
                          u32 fqid)
{
        struct sk_buff *skb;

        if (net_ratelimit())
                netif_warn(priv, hw, net_dev, "FD status = 0x%08x\n",
                           be32_to_cpu(fd->status) & FM_FD_STAT_TX_ERRORS);

        percpu_priv->stats.tx_errors++;

        skb = dpaa_cleanup_tx_fd(priv, fd);
        dev_kfree_skb(skb);
}

static int dpaa_eth_poll(struct napi_struct *napi, int budget)
{
        struct dpaa_napi_portal *np =
                        container_of(napi, struct dpaa_napi_portal, napi);

        int cleaned = qman_p_poll_dqrr(np->p, budget);

        if (cleaned < budget) {
                napi_complete_done(napi, cleaned);
                qman_p_irqsource_add(np->p, QM_PIRQ_DQRI);
        } else if (np->down) {
                qman_p_irqsource_add(np->p, QM_PIRQ_DQRI);
        }

        return cleaned;
}

static void dpaa_tx_conf(struct net_device *net_dev,
                         const struct dpaa_priv *priv,
                         struct dpaa_percpu_priv *percpu_priv,
                         const struct qm_fd *fd,
                         u32 fqid)
{
        struct sk_buff  *skb;

        if (unlikely(be32_to_cpu(fd->status) & FM_FD_STAT_TX_ERRORS)) {
                if (net_ratelimit())
                        netif_warn(priv, hw, net_dev, "FD status = 0x%08x\n",
                                   be32_to_cpu(fd->status) &
                                   FM_FD_STAT_TX_ERRORS);

                percpu_priv->stats.tx_errors++;
        }

        percpu_priv->tx_confirm++;

        skb = dpaa_cleanup_tx_fd(priv, fd);

        consume_skb(skb);
}

static inline int dpaa_eth_napi_schedule(struct dpaa_percpu_priv *percpu_priv,
                                         struct qman_portal *portal)
{
        if (unlikely(in_irq() || !in_serving_softirq())) {
                /* Disable QMan IRQ and invoke NAPI */
                qman_p_irqsource_remove(portal, QM_PIRQ_DQRI);

                percpu_priv->np.p = portal;
                napi_schedule(&percpu_priv->np.napi);
                percpu_priv->in_interrupt++;
                return 1;
        }
        return 0;
}

static enum qman_cb_dqrr_result rx_error_dqrr(struct qman_portal *portal,
                                              struct qman_fq *fq,
                                              const struct qm_dqrr_entry *dq)
{
        struct dpaa_fq *dpaa_fq = container_of(fq, struct dpaa_fq, fq_base);
        struct dpaa_percpu_priv *percpu_priv;
        struct net_device *net_dev;
        struct dpaa_bp *dpaa_bp;
        struct dpaa_priv *priv;

        net_dev = dpaa_fq->net_dev;
        priv = netdev_priv(net_dev);
        dpaa_bp = dpaa_bpid2pool(dq->fd.bpid);
        if (!dpaa_bp)
                return qman_cb_dqrr_consume;

        percpu_priv = this_cpu_ptr(priv->percpu_priv);

        if (dpaa_eth_napi_schedule(percpu_priv, portal))
                return qman_cb_dqrr_stop;

        dpaa_eth_refill_bpools(priv);
        dpaa_rx_error(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);

        return qman_cb_dqrr_consume;
}

static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
                                                struct qman_fq *fq,
                                                const struct qm_dqrr_entry *dq)
{
        struct skb_shared_hwtstamps *shhwtstamps;
        struct rtnl_link_stats64 *percpu_stats;
        struct dpaa_percpu_priv *percpu_priv;
        const struct qm_fd *fd = &dq->fd;
        dma_addr_t addr = qm_fd_addr(fd);
        enum qm_fd_format fd_format;
        struct net_device *net_dev;
        u32 fd_status, hash_offset;
        struct dpaa_bp *dpaa_bp;
        struct dpaa_priv *priv;
        unsigned int skb_len;
        struct sk_buff *skb;
        int *count_ptr;
        void *vaddr;
        u64 ns;

        fd_status = be32_to_cpu(fd->status);
        fd_format = qm_fd_get_format(fd);
        net_dev = ((struct dpaa_fq *)fq)->net_dev;
        priv = netdev_priv(net_dev);
        dpaa_bp = dpaa_bpid2pool(dq->fd.bpid);
        if (!dpaa_bp)
                return qman_cb_dqrr_consume;

        /* Trace the Rx fd */
        trace_dpaa_rx_fd(net_dev, fq, &dq->fd);

        percpu_priv = this_cpu_ptr(priv->percpu_priv);
        percpu_stats = &percpu_priv->stats;

        if (unlikely(dpaa_eth_napi_schedule(percpu_priv, portal)))
                return qman_cb_dqrr_stop;

        /* Make sure we didn't run out of buffers */
        if (unlikely(dpaa_eth_refill_bpools(priv))) {
                /* Unable to refill the buffer pool due to insufficient
                 * system memory. Just release the frame back into the pool,
                 * otherwise we'll soon end up with an empty buffer pool.
                 */
                dpaa_fd_release(net_dev, &dq->fd);
                return qman_cb_dqrr_consume;
        }

        if (unlikely(fd_status & FM_FD_STAT_RX_ERRORS) != 0) {
                if (net_ratelimit())
                        netif_warn(priv, hw, net_dev, "FD status = 0x%08x\n",
                                   fd_status & FM_FD_STAT_RX_ERRORS);

                percpu_stats->rx_errors++;
                dpaa_fd_release(net_dev, fd);
                return qman_cb_dqrr_consume;
        }

        dpaa_bp = dpaa_bpid2pool(fd->bpid);
        if (!dpaa_bp)
                return qman_cb_dqrr_consume;

        dma_unmap_single(dpaa_bp->dev, addr, dpaa_bp->size, DMA_FROM_DEVICE);

        /* prefetch the first 64 bytes of the frame or the SGT start */
        vaddr = phys_to_virt(addr);
        prefetch(vaddr + qm_fd_get_offset(fd));

        /* The only FD types that we may receive are contig and S/G */
        WARN_ON((fd_format != qm_fd_contig) && (fd_format != qm_fd_sg));

        /* Account for either the contig buffer or the SGT buffer (depending on
         * which case we were in) having been removed from the pool.
         */
        count_ptr = this_cpu_ptr(dpaa_bp->percpu_count);
        (*count_ptr)--;

        if (likely(fd_format == qm_fd_contig))
                skb = contig_fd_to_skb(priv, fd);
        else
                skb = sg_fd_to_skb(priv, fd);
        if (!skb)
                return qman_cb_dqrr_consume;

        if (priv->rx_tstamp) {
                shhwtstamps = skb_hwtstamps(skb);
                memset(shhwtstamps, 0, sizeof(*shhwtstamps));

                if (!fman_port_get_tstamp(priv->mac_dev->port[RX], vaddr, &ns))
                        shhwtstamps->hwtstamp = ns_to_ktime(ns);
                else
                        dev_warn(net_dev->dev.parent, "fman_port_get_tstamp failed!\n");
        }

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

        if (net_dev->features & NETIF_F_RXHASH && priv->keygen_in_use &&
            !fman_port_get_hash_result_offset(priv->mac_dev->port[RX],
                                              &hash_offset)) {
                enum pkt_hash_types type;

                /* if L4 exists, it was used in the hash generation */
                type = be32_to_cpu(fd->status) & FM_FD_STAT_L4CV ?
                        PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3;
                skb_set_hash(skb, be32_to_cpu(*(u32 *)(vaddr + hash_offset)),
                             type);
        }

        skb_len = skb->len;

        if (unlikely(netif_receive_skb(skb) == NET_RX_DROP)) {
                percpu_stats->rx_dropped++;
                return qman_cb_dqrr_consume;
        }

        percpu_stats->rx_packets++;
        percpu_stats->rx_bytes += skb_len;

        return qman_cb_dqrr_consume;
}

static enum qman_cb_dqrr_result conf_error_dqrr(struct qman_portal *portal,
                                                struct qman_fq *fq,
                                                const struct qm_dqrr_entry *dq)
{
        struct dpaa_percpu_priv *percpu_priv;
        struct net_device *net_dev;
        struct dpaa_priv *priv;

        net_dev = ((struct dpaa_fq *)fq)->net_dev;
        priv = netdev_priv(net_dev);

        percpu_priv = this_cpu_ptr(priv->percpu_priv);

        if (dpaa_eth_napi_schedule(percpu_priv, portal))
                return qman_cb_dqrr_stop;

        dpaa_tx_error(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);

        return qman_cb_dqrr_consume;
}

static enum qman_cb_dqrr_result conf_dflt_dqrr(struct qman_portal *portal,
                                               struct qman_fq *fq,
                                               const struct qm_dqrr_entry *dq)
{
        struct dpaa_percpu_priv *percpu_priv;
        struct net_device *net_dev;
        struct dpaa_priv *priv;

        net_dev = ((struct dpaa_fq *)fq)->net_dev;
        priv = netdev_priv(net_dev);

        /* Trace the fd */
        trace_dpaa_tx_conf_fd(net_dev, fq, &dq->fd);

        percpu_priv = this_cpu_ptr(priv->percpu_priv);

        if (dpaa_eth_napi_schedule(percpu_priv, portal))
                return qman_cb_dqrr_stop;

        dpaa_tx_conf(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);

        return qman_cb_dqrr_consume;
}

static void egress_ern(struct qman_portal *portal,
                       struct qman_fq *fq,
                       const union qm_mr_entry *msg)
{
        const struct qm_fd *fd = &msg->ern.fd;
        struct dpaa_percpu_priv *percpu_priv;
        const struct dpaa_priv *priv;
        struct net_device *net_dev;
        struct sk_buff *skb;

        net_dev = ((struct dpaa_fq *)fq)->net_dev;
        priv = netdev_priv(net_dev);
        percpu_priv = this_cpu_ptr(priv->percpu_priv);

        percpu_priv->stats.tx_dropped++;
        percpu_priv->stats.tx_fifo_errors++;
        count_ern(percpu_priv, msg);

        skb = dpaa_cleanup_tx_fd(priv, fd);
        dev_kfree_skb_any(skb);
}

static const struct dpaa_fq_cbs dpaa_fq_cbs = {
        .rx_defq = { .cb = { .dqrr = rx_default_dqrr } },
        .tx_defq = { .cb = { .dqrr = conf_dflt_dqrr } },
        .rx_errq = { .cb = { .dqrr = rx_error_dqrr } },
        .tx_errq = { .cb = { .dqrr = conf_error_dqrr } },
        .egress_ern = { .cb = { .ern = egress_ern } }
};

static void dpaa_eth_napi_enable(struct dpaa_priv *priv)
{
        struct dpaa_percpu_priv *percpu_priv;
        int i;

        for_each_online_cpu(i) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, i);

                percpu_priv->np.down = 0;
                napi_enable(&percpu_priv->np.napi);
        }
}

static void dpaa_eth_napi_disable(struct dpaa_priv *priv)
{
        struct dpaa_percpu_priv *percpu_priv;
        int i;

        for_each_online_cpu(i) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, i);

                percpu_priv->np.down = 1;
                napi_disable(&percpu_priv->np.napi);
        }
}

static void dpaa_adjust_link(struct net_device *net_dev)
{
        struct mac_device *mac_dev;
        struct dpaa_priv *priv;

        priv = netdev_priv(net_dev);
        mac_dev = priv->mac_dev;
        mac_dev->adjust_link(mac_dev);
}

static int dpaa_phy_init(struct net_device *net_dev)
{
        __ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
        struct mac_device *mac_dev;
        struct phy_device *phy_dev;
        struct dpaa_priv *priv;

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

        phy_dev = of_phy_connect(net_dev, mac_dev->phy_node,
                                 &dpaa_adjust_link, 0,
                                 mac_dev->phy_if);
        if (!phy_dev) {
                netif_err(priv, ifup, net_dev, "init_phy() failed\n");
                return -ENODEV;
        }

        /* Remove any features not supported by the controller */
        ethtool_convert_legacy_u32_to_link_mode(mask, mac_dev->if_support);
        linkmode_and(phy_dev->supported, phy_dev->supported, mask);

        phy_support_asym_pause(phy_dev);

        mac_dev->phy_dev = phy_dev;
        net_dev->phydev = phy_dev;

        return 0;
}

static int dpaa_open(struct net_device *net_dev)
{
        struct mac_device *mac_dev;
        struct dpaa_priv *priv;
        int err, i;

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

        err = dpaa_phy_init(net_dev);
        if (err)
                goto phy_init_failed;

        for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++) {
                err = fman_port_enable(mac_dev->port[i]);
                if (err)
                        goto mac_start_failed;
        }

        err = priv->mac_dev->start(mac_dev);
        if (err < 0) {
                netif_err(priv, ifup, net_dev, "mac_dev->start() = %d\n", err);
                goto mac_start_failed;
        }

        netif_tx_start_all_queues(net_dev);

        return 0;

mac_start_failed:
        for (i = 0; i < ARRAY_SIZE(mac_dev->port); i++)
                fman_port_disable(mac_dev->port[i]);

phy_init_failed:
        dpaa_eth_napi_disable(priv);

        return err;
}

static int dpaa_eth_stop(struct net_device *net_dev)
{
        struct dpaa_priv *priv;
        int err;

        err = dpaa_stop(net_dev);

        priv = netdev_priv(net_dev);
        dpaa_eth_napi_disable(priv);

        return err;
}

static int dpaa_ts_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct dpaa_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:
                /* Couldn't disable rx/tx timestamping separately.
                 * Do nothing here.
                 */
                priv->tx_tstamp = false;
                break;
        case HWTSTAMP_TX_ON:
                priv->mac_dev->set_tstamp(priv->mac_dev->fman_mac, true);
                priv->tx_tstamp = true;
                break;
        default:
                return -ERANGE;
        }

        if (config.rx_filter == HWTSTAMP_FILTER_NONE) {
                /* Couldn't disable rx/tx timestamping separately.
                 * Do nothing here.
                 */
                priv->rx_tstamp = false;
        } else {
                priv->mac_dev->set_tstamp(priv->mac_dev->fman_mac, true);
                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 dpaa_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd)
{
        int ret = -EINVAL;

        if (cmd == SIOCGMIIREG) {
                if (net_dev->phydev)
                        return phy_mii_ioctl(net_dev->phydev, rq, cmd);
        }

        if (cmd == SIOCSHWTSTAMP)
                return dpaa_ts_ioctl(net_dev, rq, cmd);

        return ret;
}

static const struct net_device_ops dpaa_ops = {
        .ndo_open = dpaa_open,
        .ndo_start_xmit = dpaa_start_xmit,
        .ndo_stop = dpaa_eth_stop,
        .ndo_tx_timeout = dpaa_tx_timeout,
        .ndo_get_stats64 = dpaa_get_stats64,
        .ndo_change_carrier = fixed_phy_change_carrier,
        .ndo_set_mac_address = dpaa_set_mac_address,
        .ndo_validate_addr = eth_validate_addr,
        .ndo_set_rx_mode = dpaa_set_rx_mode,
        .ndo_do_ioctl = dpaa_ioctl,
        .ndo_setup_tc = dpaa_setup_tc,
};

static int dpaa_napi_add(struct net_device *net_dev)
{
        struct dpaa_priv *priv = netdev_priv(net_dev);
        struct dpaa_percpu_priv *percpu_priv;
        int cpu;

        for_each_possible_cpu(cpu) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, cpu);

                netif_napi_add(net_dev, &percpu_priv->np.napi,
                               dpaa_eth_poll, NAPI_POLL_WEIGHT);
        }

        return 0;
}

static void dpaa_napi_del(struct net_device *net_dev)
{
        struct dpaa_priv *priv = netdev_priv(net_dev);
        struct dpaa_percpu_priv *percpu_priv;
        int cpu;

        for_each_possible_cpu(cpu) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, cpu);

                netif_napi_del(&percpu_priv->np.napi);
        }
}

static inline void dpaa_bp_free_pf(const struct dpaa_bp *bp,
                                   struct bm_buffer *bmb)
{
        dma_addr_t addr = bm_buf_addr(bmb);

        dma_unmap_single(bp->dev, addr, bp->size, DMA_FROM_DEVICE);

        skb_free_frag(phys_to_virt(addr));
}

/* Alloc the dpaa_bp struct and configure default values */
static struct dpaa_bp *dpaa_bp_alloc(struct device *dev)
{
        struct dpaa_bp *dpaa_bp;

        dpaa_bp = devm_kzalloc(dev, sizeof(*dpaa_bp), GFP_KERNEL);
        if (!dpaa_bp)
                return ERR_PTR(-ENOMEM);

        dpaa_bp->bpid = FSL_DPAA_BPID_INV;
        dpaa_bp->percpu_count = devm_alloc_percpu(dev, *dpaa_bp->percpu_count);
        if (!dpaa_bp->percpu_count)
                return ERR_PTR(-ENOMEM);

        dpaa_bp->config_count = FSL_DPAA_ETH_MAX_BUF_COUNT;

        dpaa_bp->seed_cb = dpaa_bp_seed;
        dpaa_bp->free_buf_cb = dpaa_bp_free_pf;

        return dpaa_bp;
}

/* Place all ingress FQs (Rx Default, Rx Error) in a dedicated CGR.
 * We won't be sending congestion notifications to FMan; for now, we just use
 * this CGR to generate enqueue rejections to FMan in order to drop the frames
 * before they reach our ingress queues and eat up memory.
 */
static int dpaa_ingress_cgr_init(struct dpaa_priv *priv)
{
        struct qm_mcc_initcgr initcgr;
        u32 cs_th;
        int err;

        err = qman_alloc_cgrid(&priv->ingress_cgr.cgrid);
        if (err < 0) {
                if (netif_msg_drv(priv))
                        pr_err("Error %d allocating CGR ID\n", err);
                goto out_error;
        }

        /* Enable CS TD, but disable Congestion State Change Notifications. */
        memset(&initcgr, 0, sizeof(initcgr));
        initcgr.we_mask = cpu_to_be16(QM_CGR_WE_CS_THRES);
        initcgr.cgr.cscn_en = QM_CGR_EN;
        cs_th = DPAA_INGRESS_CS_THRESHOLD;
        qm_cgr_cs_thres_set64(&initcgr.cgr.cs_thres, cs_th, 1);

        initcgr.we_mask |= cpu_to_be16(QM_CGR_WE_CSTD_EN);
        initcgr.cgr.cstd_en = QM_CGR_EN;

        /* This CGR will be associated with the SWP affined to the current CPU.
         * However, we'll place all our ingress FQs in it.
         */
        err = qman_create_cgr(&priv->ingress_cgr, QMAN_CGR_FLAG_USE_INIT,
                              &initcgr);
        if (err < 0) {
                if (netif_msg_drv(priv))
                        pr_err("Error %d creating ingress CGR with ID %d\n",
                               err, priv->ingress_cgr.cgrid);
                qman_release_cgrid(priv->ingress_cgr.cgrid);
                goto out_error;
        }
        if (netif_msg_drv(priv))
                pr_debug("Created ingress CGR %d for netdev with hwaddr %pM\n",
                         priv->ingress_cgr.cgrid, priv->mac_dev->addr);

        priv->use_ingress_cgr = true;

out_error:
        return err;
}

static inline u16 dpaa_get_headroom(struct dpaa_buffer_layout *bl)
{
        u16 headroom;

        /* The frame headroom must accommodate:
         * - the driver private data area
         * - parse results, hash results, timestamp if selected
         * If either hash results or time stamp are selected, both will
         * be copied to/from the frame headroom, as TS is located between PR and
         * HR in the IC and IC copy size has a granularity of 16bytes
         * (see description of FMBM_RICP and FMBM_TICP registers in DPAARM)
         *
         * Also make sure the headroom is a multiple of data_align bytes
         */
        headroom = (u16)(bl->priv_data_size + DPAA_PARSE_RESULTS_SIZE +
                DPAA_TIME_STAMP_SIZE + DPAA_HASH_RESULTS_SIZE);

        return DPAA_FD_DATA_ALIGNMENT ? ALIGN(headroom,
                                              DPAA_FD_DATA_ALIGNMENT) :
                                        headroom;
}

static int dpaa_eth_probe(struct platform_device *pdev)
{
        struct dpaa_bp *dpaa_bps[DPAA_BPS_NUM] = {NULL};
        struct net_device *net_dev = NULL;
        struct dpaa_fq *dpaa_fq, *tmp;
        struct dpaa_priv *priv = NULL;
        struct fm_port_fqs port_fqs;
        struct mac_device *mac_dev;
        int err = 0, i, channel;
        struct device *dev;

        /* device used for DMA mapping */
        dev = pdev->dev.parent;
        err = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(40));
        if (err) {
                dev_err(dev, "dma_coerce_mask_and_coherent() failed\n");
                return err;
        }

        /* Allocate this early, so we can store relevant information in
         * the private area
         */
        net_dev = alloc_etherdev_mq(sizeof(*priv), DPAA_ETH_TXQ_NUM);
        if (!net_dev) {
                dev_err(dev, "alloc_etherdev_mq() failed\n");
                return -ENOMEM;
        }

        /* Do this here, so we can be verbose early */
        SET_NETDEV_DEV(net_dev, dev);
        dev_set_drvdata(dev, net_dev);

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

        priv->msg_enable = netif_msg_init(debug, DPAA_MSG_DEFAULT);

        mac_dev = dpaa_mac_dev_get(pdev);
        if (IS_ERR(mac_dev)) {
                dev_err(dev, "dpaa_mac_dev_get() failed\n");
                err = PTR_ERR(mac_dev);
                goto free_netdev;
        }

        /* If fsl_fm_max_frm is set to a higher value than the all-common 1500,
         * we choose conservatively and let the user explicitly set a higher
         * MTU via ifconfig. Otherwise, the user may end up with different MTUs
         * in the same LAN.
         * If on the other hand fsl_fm_max_frm has been chosen below 1500,
         * start with the maximum allowed.
         */
        net_dev->mtu = min(dpaa_get_max_mtu(), ETH_DATA_LEN);

        netdev_dbg(net_dev, "Setting initial MTU on net device: %d\n",
                   net_dev->mtu);

        priv->buf_layout[RX].priv_data_size = DPAA_RX_PRIV_DATA_SIZE; /* Rx */
        priv->buf_layout[TX].priv_data_size = DPAA_TX_PRIV_DATA_SIZE; /* Tx */

        /* bp init */
        for (i = 0; i < DPAA_BPS_NUM; i++) {
                dpaa_bps[i] = dpaa_bp_alloc(dev);
                if (IS_ERR(dpaa_bps[i])) {
                        err = PTR_ERR(dpaa_bps[i]);
                        goto free_dpaa_bps;
                }
                /* the raw size of the buffers used for reception */
                dpaa_bps[i]->raw_size = bpool_buffer_raw_size(i, DPAA_BPS_NUM);
                /* avoid runtime computations by keeping the usable size here */
                dpaa_bps[i]->size = dpaa_bp_size(dpaa_bps[i]->raw_size);
                dpaa_bps[i]->dev = dev;

                err = dpaa_bp_alloc_pool(dpaa_bps[i]);
                if (err < 0)
                        goto free_dpaa_bps;
                priv->dpaa_bps[i] = dpaa_bps[i];
        }

        INIT_LIST_HEAD(&priv->dpaa_fq_list);

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

        err = dpaa_alloc_all_fqs(dev, &priv->dpaa_fq_list, &port_fqs);
        if (err < 0) {
                dev_err(dev, "dpaa_alloc_all_fqs() failed\n");
                goto free_dpaa_bps;
        }

        priv->mac_dev = mac_dev;

        channel = dpaa_get_channel();
        if (channel < 0) {
                dev_err(dev, "dpaa_get_channel() failed\n");
                err = channel;
                goto free_dpaa_bps;
        }

        priv->channel = (u16)channel;

        /* Walk the CPUs with affine portals
         * and add this pool channel to each's dequeue mask.
         */
        dpaa_eth_add_channel(priv->channel);

        dpaa_fq_setup(priv, &dpaa_fq_cbs, priv->mac_dev->port[TX]);

        /* Create a congestion group for this netdev, with
         * dynamically-allocated CGR ID.
         * Must be executed after probing the MAC, but before
         * assigning the egress FQs to the CGRs.
         */
        err = dpaa_eth_cgr_init(priv);
        if (err < 0) {
                dev_err(dev, "Error initializing CGR\n");
                goto free_dpaa_bps;
        }

        err = dpaa_ingress_cgr_init(priv);
        if (err < 0) {
                dev_err(dev, "Error initializing ingress CGR\n");
                goto delete_egress_cgr;
        }

        /* Add the FQs to the interface, and make them active */
        list_for_each_entry_safe(dpaa_fq, tmp, &priv->dpaa_fq_list, list) {
                err = dpaa_fq_init(dpaa_fq, false);
                if (err < 0)
                        goto free_dpaa_fqs;
        }

        priv->tx_headroom = dpaa_get_headroom(&priv->buf_layout[TX]);
        priv->rx_headroom = dpaa_get_headroom(&priv->buf_layout[RX]);

        /* All real interfaces need their ports initialized */
        err = dpaa_eth_init_ports(mac_dev, dpaa_bps, DPAA_BPS_NUM, &port_fqs,
                                  &priv->buf_layout[0], dev);
        if (err)
                goto free_dpaa_fqs;

        /* Rx traffic distribution based on keygen hashing defaults to on */
        priv->keygen_in_use = true;

        priv->percpu_priv = devm_alloc_percpu(dev, *priv->percpu_priv);
        if (!priv->percpu_priv) {
                dev_err(dev, "devm_alloc_percpu() failed\n");
                err = -ENOMEM;
                goto free_dpaa_fqs;
        }

        priv->num_tc = 1;
        netif_set_real_num_tx_queues(net_dev, priv->num_tc * DPAA_TC_TXQ_NUM);

        /* Initialize NAPI */
        err = dpaa_napi_add(net_dev);
        if (err < 0)
                goto delete_dpaa_napi;

        err = dpaa_netdev_init(net_dev, &dpaa_ops, tx_timeout);
        if (err < 0)
                goto delete_dpaa_napi;

        dpaa_eth_sysfs_init(&net_dev->dev);

        netif_info(priv, probe, net_dev, "Probed interface %s\n",
                   net_dev->name);

        return 0;

delete_dpaa_napi:
        dpaa_napi_del(net_dev);
free_dpaa_fqs:
        dpaa_fq_free(dev, &priv->dpaa_fq_list);
        qman_delete_cgr_safe(&priv->ingress_cgr);
        qman_release_cgrid(priv->ingress_cgr.cgrid);
delete_egress_cgr:
        qman_delete_cgr_safe(&priv->cgr_data.cgr);
        qman_release_cgrid(priv->cgr_data.cgr.cgrid);
free_dpaa_bps:
        dpaa_bps_free(priv);
free_netdev:
        dev_set_drvdata(dev, NULL);
        free_netdev(net_dev);

        return err;
}

static int dpaa_remove(struct platform_device *pdev)
{
        struct net_device *net_dev;
        struct dpaa_priv *priv;
        struct device *dev;
        int err;

        dev = pdev->dev.parent;
        net_dev = dev_get_drvdata(dev);

        priv = netdev_priv(net_dev);

        dpaa_eth_sysfs_remove(dev);

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

        err = dpaa_fq_free(dev, &priv->dpaa_fq_list);

        qman_delete_cgr_safe(&priv->ingress_cgr);
        qman_release_cgrid(priv->ingress_cgr.cgrid);
        qman_delete_cgr_safe(&priv->cgr_data.cgr);
        qman_release_cgrid(priv->cgr_data.cgr.cgrid);

        dpaa_napi_del(net_dev);

        dpaa_bps_free(priv);

        free_netdev(net_dev);

        return err;
}

static const struct platform_device_id dpaa_devtype[] = {
        {
                .name = "dpaa-ethernet",
                .driver_data = 0,
        }, {
        }
};
MODULE_DEVICE_TABLE(platform, dpaa_devtype);

static struct platform_driver dpaa_driver = {
        .driver = {
                .name = KBUILD_MODNAME,
        },
        .id_table = dpaa_devtype,
        .probe = dpaa_eth_probe,
        .remove = dpaa_remove
};