// SPDX-License-Identifier: GPL-2.0+
// Copyright (c) 2016-2017 Hisilicon Limited.

#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#ifdef CONFIG_RFS_ACCEL
#include <linux/cpu_rmap.h>
#endif
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/aer.h>
#include <linux/skbuff.h>
#include <linux/sctp.h>
#include <linux/vermagic.h>
#include <net/gre.h>
#include <net/ip6_checksum.h>
#include <net/pkt_cls.h>
#include <net/tcp.h>
#include <net/vxlan.h>

#include "hnae3.h"
#include "hns3_enet.h"

#define hns3_set_field(origin, shift, val)      ((origin) |= ((val) << (shift)))
#define hns3_tx_bd_count(S)     DIV_ROUND_UP(S, HNS3_MAX_BD_SIZE)

static void hns3_clear_all_ring(struct hnae3_handle *h, bool force);
static void hns3_remove_hw_addr(struct net_device *netdev);

static const char hns3_driver_name[] = "hns3";
const char hns3_driver_version[] = VERMAGIC_STRING;
static const char hns3_driver_string[] =
                        "Hisilicon Ethernet Network Driver for Hip08 Family";
static const char hns3_copyright[] = "Copyright (c) 2017 Huawei Corporation.";
static struct hnae3_client client;

static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, " Network interface message level setting");

#define DEFAULT_MSG_LEVEL (NETIF_MSG_PROBE | NETIF_MSG_LINK | \
                           NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)

/* hns3_pci_tbl - PCI Device ID Table
 *
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static const struct pci_device_id hns3_pci_tbl[] = {
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_GE), 0},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_25GE), 0},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_25GE_RDMA),
         HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_25GE_RDMA_MACSEC),
         HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_50GE_RDMA),
         HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_50GE_RDMA_MACSEC),
         HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_100G_RDMA_MACSEC),
         HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_100G_VF), 0},
        {PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_100G_RDMA_DCB_PFC_VF),
         HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
        /* required last entry */
        {0, }
};
MODULE_DEVICE_TABLE(pci, hns3_pci_tbl);

static irqreturn_t hns3_irq_handle(int irq, void *vector)
{
        struct hns3_enet_tqp_vector *tqp_vector = vector;

        napi_schedule_irqoff(&tqp_vector->napi);

        return IRQ_HANDLED;
}

static void hns3_nic_uninit_irq(struct hns3_nic_priv *priv)
{
        struct hns3_enet_tqp_vector *tqp_vectors;
        unsigned int i;

        for (i = 0; i < priv->vector_num; i++) {
                tqp_vectors = &priv->tqp_vector[i];

                if (tqp_vectors->irq_init_flag != HNS3_VECTOR_INITED)
                        continue;

                /* clear the affinity mask */
                irq_set_affinity_hint(tqp_vectors->vector_irq, NULL);

                /* release the irq resource */
                free_irq(tqp_vectors->vector_irq, tqp_vectors);
                tqp_vectors->irq_init_flag = HNS3_VECTOR_NOT_INITED;
        }
}

static int hns3_nic_init_irq(struct hns3_nic_priv *priv)
{
        struct hns3_enet_tqp_vector *tqp_vectors;
        int txrx_int_idx = 0;
        int rx_int_idx = 0;
        int tx_int_idx = 0;
        unsigned int i;
        int ret;

        for (i = 0; i < priv->vector_num; i++) {
                tqp_vectors = &priv->tqp_vector[i];

                if (tqp_vectors->irq_init_flag == HNS3_VECTOR_INITED)
                        continue;

                if (tqp_vectors->tx_group.ring && tqp_vectors->rx_group.ring) {
                        snprintf(tqp_vectors->name, HNAE3_INT_NAME_LEN - 1,
                                 "%s-%s-%d", priv->netdev->name, "TxRx",
                                 txrx_int_idx++);
                        txrx_int_idx++;
                } else if (tqp_vectors->rx_group.ring) {
                        snprintf(tqp_vectors->name, HNAE3_INT_NAME_LEN - 1,
                                 "%s-%s-%d", priv->netdev->name, "Rx",
                                 rx_int_idx++);
                } else if (tqp_vectors->tx_group.ring) {
                        snprintf(tqp_vectors->name, HNAE3_INT_NAME_LEN - 1,
                                 "%s-%s-%d", priv->netdev->name, "Tx",
                                 tx_int_idx++);
                } else {
                        /* Skip this unused q_vector */
                        continue;
                }

                tqp_vectors->name[HNAE3_INT_NAME_LEN - 1] = '\0';

                ret = request_irq(tqp_vectors->vector_irq, hns3_irq_handle, 0,
                                  tqp_vectors->name, tqp_vectors);
                if (ret) {
                        netdev_err(priv->netdev, "request irq(%d) fail\n",
                                   tqp_vectors->vector_irq);
                        hns3_nic_uninit_irq(priv);
                        return ret;
                }

                irq_set_affinity_hint(tqp_vectors->vector_irq,
                                      &tqp_vectors->affinity_mask);

                tqp_vectors->irq_init_flag = HNS3_VECTOR_INITED;
        }

        return 0;
}

static void hns3_mask_vector_irq(struct hns3_enet_tqp_vector *tqp_vector,
                                 u32 mask_en)
{
        writel(mask_en, tqp_vector->mask_addr);
}

static void hns3_vector_enable(struct hns3_enet_tqp_vector *tqp_vector)
{
        napi_enable(&tqp_vector->napi);

        /* enable vector */
        hns3_mask_vector_irq(tqp_vector, 1);
}

static void hns3_vector_disable(struct hns3_enet_tqp_vector *tqp_vector)
{
        /* disable vector */
        hns3_mask_vector_irq(tqp_vector, 0);

        disable_irq(tqp_vector->vector_irq);
        napi_disable(&tqp_vector->napi);
}

void hns3_set_vector_coalesce_rl(struct hns3_enet_tqp_vector *tqp_vector,
                                 u32 rl_value)
{
        u32 rl_reg = hns3_rl_usec_to_reg(rl_value);

        /* this defines the configuration for RL (Interrupt Rate Limiter).
         * Rl defines rate of interrupts i.e. number of interrupts-per-second
         * GL and RL(Rate Limiter) are 2 ways to acheive interrupt coalescing
         */

        if (rl_reg > 0 && !tqp_vector->tx_group.coal.gl_adapt_enable &&
            !tqp_vector->rx_group.coal.gl_adapt_enable)
                /* According to the hardware, the range of rl_reg is
                 * 0-59 and the unit is 4.
                 */
                rl_reg |=  HNS3_INT_RL_ENABLE_MASK;

        writel(rl_reg, tqp_vector->mask_addr + HNS3_VECTOR_RL_OFFSET);
}

void hns3_set_vector_coalesce_rx_gl(struct hns3_enet_tqp_vector *tqp_vector,
                                    u32 gl_value)
{
        u32 rx_gl_reg = hns3_gl_usec_to_reg(gl_value);

        writel(rx_gl_reg, tqp_vector->mask_addr + HNS3_VECTOR_GL0_OFFSET);
}

void hns3_set_vector_coalesce_tx_gl(struct hns3_enet_tqp_vector *tqp_vector,
                                    u32 gl_value)
{
        u32 tx_gl_reg = hns3_gl_usec_to_reg(gl_value);

        writel(tx_gl_reg, tqp_vector->mask_addr + HNS3_VECTOR_GL1_OFFSET);
}

static void hns3_vector_gl_rl_init(struct hns3_enet_tqp_vector *tqp_vector,
                                   struct hns3_nic_priv *priv)
{
        /* initialize the configuration for interrupt coalescing.
         * 1. GL (Interrupt Gap Limiter)
         * 2. RL (Interrupt Rate Limiter)
         */

        /* Default: enable interrupt coalescing self-adaptive and GL */
        tqp_vector->tx_group.coal.gl_adapt_enable = 1;
        tqp_vector->rx_group.coal.gl_adapt_enable = 1;

        tqp_vector->tx_group.coal.int_gl = HNS3_INT_GL_50K;
        tqp_vector->rx_group.coal.int_gl = HNS3_INT_GL_50K;

        tqp_vector->rx_group.coal.flow_level = HNS3_FLOW_LOW;
        tqp_vector->tx_group.coal.flow_level = HNS3_FLOW_LOW;
}

static void hns3_vector_gl_rl_init_hw(struct hns3_enet_tqp_vector *tqp_vector,
                                      struct hns3_nic_priv *priv)
{
        struct hnae3_handle *h = priv->ae_handle;

        hns3_set_vector_coalesce_tx_gl(tqp_vector,
                                       tqp_vector->tx_group.coal.int_gl);
        hns3_set_vector_coalesce_rx_gl(tqp_vector,
                                       tqp_vector->rx_group.coal.int_gl);
        hns3_set_vector_coalesce_rl(tqp_vector, h->kinfo.int_rl_setting);
}

static int hns3_nic_set_real_num_queue(struct net_device *netdev)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        struct hnae3_knic_private_info *kinfo = &h->kinfo;
        unsigned int queue_size = kinfo->rss_size * kinfo->num_tc;
        int i, ret;

        if (kinfo->num_tc <= 1) {
                netdev_reset_tc(netdev);
        } else {
                ret = netdev_set_num_tc(netdev, kinfo->num_tc);
                if (ret) {
                        netdev_err(netdev,
                                   "netdev_set_num_tc fail, ret=%d!\n", ret);
                        return ret;
                }

                for (i = 0; i < HNAE3_MAX_TC; i++) {
                        if (!kinfo->tc_info[i].enable)
                                continue;

                        netdev_set_tc_queue(netdev,
                                            kinfo->tc_info[i].tc,
                                            kinfo->tc_info[i].tqp_count,
                                            kinfo->tc_info[i].tqp_offset);
                }
        }

        ret = netif_set_real_num_tx_queues(netdev, queue_size);
        if (ret) {
                netdev_err(netdev,
                           "netif_set_real_num_tx_queues fail, ret=%d!\n", ret);
                return ret;
        }

        ret = netif_set_real_num_rx_queues(netdev, queue_size);
        if (ret) {
                netdev_err(netdev,
                           "netif_set_real_num_rx_queues fail, ret=%d!\n", ret);
                return ret;
        }

        return 0;
}

static u16 hns3_get_max_available_channels(struct hnae3_handle *h)
{
        u16 alloc_tqps, max_rss_size, rss_size;

        h->ae_algo->ops->get_tqps_and_rss_info(h, &alloc_tqps, &max_rss_size);
        rss_size = alloc_tqps / h->kinfo.num_tc;

        return min_t(u16, rss_size, max_rss_size);
}

static void hns3_tqp_enable(struct hnae3_queue *tqp)
{
        u32 rcb_reg;

        rcb_reg = hns3_read_dev(tqp, HNS3_RING_EN_REG);
        rcb_reg |= BIT(HNS3_RING_EN_B);
        hns3_write_dev(tqp, HNS3_RING_EN_REG, rcb_reg);
}

static void hns3_tqp_disable(struct hnae3_queue *tqp)
{
        u32 rcb_reg;

        rcb_reg = hns3_read_dev(tqp, HNS3_RING_EN_REG);
        rcb_reg &= ~BIT(HNS3_RING_EN_B);
        hns3_write_dev(tqp, HNS3_RING_EN_REG, rcb_reg);
}

static void hns3_free_rx_cpu_rmap(struct net_device *netdev)
{
#ifdef CONFIG_RFS_ACCEL
        free_irq_cpu_rmap(netdev->rx_cpu_rmap);
        netdev->rx_cpu_rmap = NULL;
#endif
}

static int hns3_set_rx_cpu_rmap(struct net_device *netdev)
{
#ifdef CONFIG_RFS_ACCEL
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hns3_enet_tqp_vector *tqp_vector;
        int i, ret;

        if (!netdev->rx_cpu_rmap) {
                netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(priv->vector_num);
                if (!netdev->rx_cpu_rmap)
                        return -ENOMEM;
        }

        for (i = 0; i < priv->vector_num; i++) {
                tqp_vector = &priv->tqp_vector[i];
                ret = irq_cpu_rmap_add(netdev->rx_cpu_rmap,
                                       tqp_vector->vector_irq);
                if (ret) {
                        hns3_free_rx_cpu_rmap(netdev);
                        return ret;
                }
        }
#endif
        return 0;
}

static int hns3_nic_net_up(struct net_device *netdev)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = priv->ae_handle;
        int i, j;
        int ret;

        ret = hns3_nic_reset_all_ring(h);
        if (ret)
                return ret;

        /* the device can work without cpu rmap, only aRFS needs it */
        ret = hns3_set_rx_cpu_rmap(netdev);
        if (ret)
                netdev_warn(netdev, "set rx cpu rmap fail, ret=%d!\n", ret);

        /* get irq resource for all vectors */
        ret = hns3_nic_init_irq(priv);
        if (ret) {
                netdev_err(netdev, "init irq failed! ret=%d\n", ret);
                goto free_rmap;
        }

        clear_bit(HNS3_NIC_STATE_DOWN, &priv->state);

        /* enable the vectors */
        for (i = 0; i < priv->vector_num; i++)
                hns3_vector_enable(&priv->tqp_vector[i]);

        /* enable rcb */
        for (j = 0; j < h->kinfo.num_tqps; j++)
                hns3_tqp_enable(h->kinfo.tqp[j]);

        /* start the ae_dev */
        ret = h->ae_algo->ops->start ? h->ae_algo->ops->start(h) : 0;
        if (ret)
                goto out_start_err;

        return 0;

out_start_err:
        set_bit(HNS3_NIC_STATE_DOWN, &priv->state);
        while (j--)
                hns3_tqp_disable(h->kinfo.tqp[j]);

        for (j = i - 1; j >= 0; j--)
                hns3_vector_disable(&priv->tqp_vector[j]);

        hns3_nic_uninit_irq(priv);
free_rmap:
        hns3_free_rx_cpu_rmap(netdev);
        return ret;
}

static void hns3_config_xps(struct hns3_nic_priv *priv)
{
        int i;

        for (i = 0; i < priv->vector_num; i++) {
                struct hns3_enet_tqp_vector *tqp_vector = &priv->tqp_vector[i];
                struct hns3_enet_ring *ring = tqp_vector->tx_group.ring;

                while (ring) {
                        int ret;

                        ret = netif_set_xps_queue(priv->netdev,
                                                  &tqp_vector->affinity_mask,
                                                  ring->tqp->tqp_index);
                        if (ret)
                                netdev_warn(priv->netdev,
                                            "set xps queue failed: %d", ret);

                        ring = ring->next;
                }
        }
}

static int hns3_nic_net_open(struct net_device *netdev)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = hns3_get_handle(netdev);
        struct hnae3_knic_private_info *kinfo;
        int i, ret;

        if (hns3_nic_resetting(netdev))
                return -EBUSY;

        netif_carrier_off(netdev);

        ret = hns3_nic_set_real_num_queue(netdev);
        if (ret)
                return ret;

        ret = hns3_nic_net_up(netdev);
        if (ret) {
                netdev_err(netdev, "net up fail, ret=%d!\n", ret);
                return ret;
        }

        kinfo = &h->kinfo;
        for (i = 0; i < HNAE3_MAX_USER_PRIO; i++)
                netdev_set_prio_tc_map(netdev, i, kinfo->prio_tc[i]);

        if (h->ae_algo->ops->set_timer_task)
                h->ae_algo->ops->set_timer_task(priv->ae_handle, true);

        hns3_config_xps(priv);
        return 0;
}

static void hns3_reset_tx_queue(struct hnae3_handle *h)
{
        struct net_device *ndev = h->kinfo.netdev;
        struct hns3_nic_priv *priv = netdev_priv(ndev);
        struct netdev_queue *dev_queue;
        u32 i;

        for (i = 0; i < h->kinfo.num_tqps; i++) {
                dev_queue = netdev_get_tx_queue(ndev,
                                                priv->ring_data[i].queue_index);
                netdev_tx_reset_queue(dev_queue);
        }
}

static void hns3_nic_net_down(struct net_device *netdev)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = hns3_get_handle(netdev);
        const struct hnae3_ae_ops *ops;
        int i;

        /* disable vectors */
        for (i = 0; i < priv->vector_num; i++)
                hns3_vector_disable(&priv->tqp_vector[i]);

        /* disable rcb */
        for (i = 0; i < h->kinfo.num_tqps; i++)
                hns3_tqp_disable(h->kinfo.tqp[i]);

        /* stop ae_dev */
        ops = priv->ae_handle->ae_algo->ops;
        if (ops->stop)
                ops->stop(priv->ae_handle);

        hns3_free_rx_cpu_rmap(netdev);

        /* free irq resources */
        hns3_nic_uninit_irq(priv);

        /* delay ring buffer clearing to hns3_reset_notify_uninit_enet
         * during reset process, because driver may not be able
         * to disable the ring through firmware when downing the netdev.
         */
        if (!hns3_nic_resetting(netdev))
                hns3_clear_all_ring(priv->ae_handle, false);

        hns3_reset_tx_queue(priv->ae_handle);
}

static int hns3_nic_net_stop(struct net_device *netdev)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = hns3_get_handle(netdev);

        if (test_and_set_bit(HNS3_NIC_STATE_DOWN, &priv->state))
                return 0;

        if (h->ae_algo->ops->set_timer_task)
                h->ae_algo->ops->set_timer_task(priv->ae_handle, false);

        netif_tx_stop_all_queues(netdev);
        netif_carrier_off(netdev);

        hns3_nic_net_down(netdev);

        return 0;
}

static int hns3_nic_uc_sync(struct net_device *netdev,
                            const unsigned char *addr)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);

        if (h->ae_algo->ops->add_uc_addr)
                return h->ae_algo->ops->add_uc_addr(h, addr);

        return 0;
}

static int hns3_nic_uc_unsync(struct net_device *netdev,
                              const unsigned char *addr)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);

        if (h->ae_algo->ops->rm_uc_addr)
                return h->ae_algo->ops->rm_uc_addr(h, addr);

        return 0;
}

static int hns3_nic_mc_sync(struct net_device *netdev,
                            const unsigned char *addr)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);

        if (h->ae_algo->ops->add_mc_addr)
                return h->ae_algo->ops->add_mc_addr(h, addr);

        return 0;
}

static int hns3_nic_mc_unsync(struct net_device *netdev,
                              const unsigned char *addr)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);

        if (h->ae_algo->ops->rm_mc_addr)
                return h->ae_algo->ops->rm_mc_addr(h, addr);

        return 0;
}

static u8 hns3_get_netdev_flags(struct net_device *netdev)
{
        u8 flags = 0;

        if (netdev->flags & IFF_PROMISC) {
                flags = HNAE3_USER_UPE | HNAE3_USER_MPE | HNAE3_BPE;
        } else {
                flags |= HNAE3_VLAN_FLTR;
                if (netdev->flags & IFF_ALLMULTI)
                        flags |= HNAE3_USER_MPE;
        }

        return flags;
}

static void hns3_nic_set_rx_mode(struct net_device *netdev)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        u8 new_flags;
        int ret;

        new_flags = hns3_get_netdev_flags(netdev);

        ret = __dev_uc_sync(netdev, hns3_nic_uc_sync, hns3_nic_uc_unsync);
        if (ret) {
                netdev_err(netdev, "sync uc address fail\n");
                if (ret == -ENOSPC)
                        new_flags |= HNAE3_OVERFLOW_UPE;
        }

        if (netdev->flags & IFF_MULTICAST) {
                ret = __dev_mc_sync(netdev, hns3_nic_mc_sync,
                                    hns3_nic_mc_unsync);
                if (ret) {
                        netdev_err(netdev, "sync mc address fail\n");
                        if (ret == -ENOSPC)
                                new_flags |= HNAE3_OVERFLOW_MPE;
                }
        }

        /* User mode Promisc mode enable and vlan filtering is disabled to
         * let all packets in. MAC-VLAN Table overflow Promisc enabled and
         * vlan fitering is enabled
         */
        hns3_enable_vlan_filter(netdev, new_flags & HNAE3_VLAN_FLTR);
        h->netdev_flags = new_flags;
        hns3_update_promisc_mode(netdev, new_flags);
}

int hns3_update_promisc_mode(struct net_device *netdev, u8 promisc_flags)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = priv->ae_handle;

        if (h->ae_algo->ops->set_promisc_mode) {
                return h->ae_algo->ops->set_promisc_mode(h,
                                                promisc_flags & HNAE3_UPE,
                                                promisc_flags & HNAE3_MPE);
        }

        return 0;
}

void hns3_enable_vlan_filter(struct net_device *netdev, bool enable)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = priv->ae_handle;
        bool last_state;

        if (h->pdev->revision >= 0x21 && h->ae_algo->ops->enable_vlan_filter) {
                last_state = h->netdev_flags & HNAE3_VLAN_FLTR ? true : false;
                if (enable != last_state) {
                        netdev_info(netdev,
                                    "%s vlan filter\n",
                                    enable ? "enable" : "disable");
                        h->ae_algo->ops->enable_vlan_filter(h, enable);
                }
        }
}

static int hns3_set_tso(struct sk_buff *skb, u32 *paylen,
                        u16 *mss, u32 *type_cs_vlan_tso)
{
        u32 l4_offset, hdr_len;
        union l3_hdr_info l3;
        union l4_hdr_info l4;
        u32 l4_paylen;
        int ret;

        if (!skb_is_gso(skb))
                return 0;

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

        l3.hdr = skb_network_header(skb);
        l4.hdr = skb_transport_header(skb);

        /* Software should clear the IPv4's checksum field when tso is
         * needed.
         */
        if (l3.v4->version == 4)
                l3.v4->check = 0;

        /* tunnel packet */
        if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
                                         SKB_GSO_GRE_CSUM |
                                         SKB_GSO_UDP_TUNNEL |
                                         SKB_GSO_UDP_TUNNEL_CSUM)) {
                if ((!(skb_shinfo(skb)->gso_type &
                    SKB_GSO_PARTIAL)) &&
                    (skb_shinfo(skb)->gso_type &
                    SKB_GSO_UDP_TUNNEL_CSUM)) {
                        /* Software should clear the udp's checksum
                         * field when tso is needed.
                         */
                        l4.udp->check = 0;
                }
                /* reset l3&l4 pointers from outer to inner headers */
                l3.hdr = skb_inner_network_header(skb);
                l4.hdr = skb_inner_transport_header(skb);

                /* Software should clear the IPv4's checksum field when
                 * tso is needed.
                 */
                if (l3.v4->version == 4)
                        l3.v4->check = 0;
        }

        /* normal or tunnel packet */
        l4_offset = l4.hdr - skb->data;
        hdr_len = (l4.tcp->doff << 2) + l4_offset;

        /* remove payload length from inner pseudo checksum when tso */
        l4_paylen = skb->len - l4_offset;
        csum_replace_by_diff(&l4.tcp->check,
                             (__force __wsum)htonl(l4_paylen));

        /* find the txbd field values */
        *paylen = skb->len - hdr_len;
        hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_TSO_B, 1);

        /* get MSS for TSO */
        *mss = skb_shinfo(skb)->gso_size;

        return 0;
}

static int hns3_get_l4_protocol(struct sk_buff *skb, u8 *ol4_proto,
                                u8 *il4_proto)
{
        union l3_hdr_info l3;
        unsigned char *l4_hdr;
        unsigned char *exthdr;
        u8 l4_proto_tmp;
        __be16 frag_off;

        /* find outer header point */
        l3.hdr = skb_network_header(skb);
        l4_hdr = skb_transport_header(skb);

        if (skb->protocol == htons(ETH_P_IPV6)) {
                exthdr = l3.hdr + sizeof(*l3.v6);
                l4_proto_tmp = l3.v6->nexthdr;
                if (l4_hdr != exthdr)
                        ipv6_skip_exthdr(skb, exthdr - skb->data,
                                         &l4_proto_tmp, &frag_off);
        } else if (skb->protocol == htons(ETH_P_IP)) {
                l4_proto_tmp = l3.v4->protocol;
        } else {
                return -EINVAL;
        }

        *ol4_proto = l4_proto_tmp;

        /* tunnel packet */
        if (!skb->encapsulation) {
                *il4_proto = 0;
                return 0;
        }

        /* find inner header point */
        l3.hdr = skb_inner_network_header(skb);
        l4_hdr = skb_inner_transport_header(skb);

        if (l3.v6->version == 6) {
                exthdr = l3.hdr + sizeof(*l3.v6);
                l4_proto_tmp = l3.v6->nexthdr;
                if (l4_hdr != exthdr)
                        ipv6_skip_exthdr(skb, exthdr - skb->data,
                                         &l4_proto_tmp, &frag_off);
        } else if (l3.v4->version == 4) {
                l4_proto_tmp = l3.v4->protocol;
        }

        *il4_proto = l4_proto_tmp;

        return 0;
}

/* when skb->encapsulation is 0, skb->ip_summed is CHECKSUM_PARTIAL
 * and it is udp packet, which has a dest port as the IANA assigned.
 * the hardware is expected to do the checksum offload, but the
 * hardware will not do the checksum offload when udp dest port is
 * 4789.
 */
static bool hns3_tunnel_csum_bug(struct sk_buff *skb)
{
        union l4_hdr_info l4;

        l4.hdr = skb_transport_header(skb);

        if (!(!skb->encapsulation &&
              l4.udp->dest == htons(IANA_VXLAN_UDP_PORT)))
                return false;

        skb_checksum_help(skb);

        return true;
}

static void hns3_set_outer_l2l3l4(struct sk_buff *skb, u8 ol4_proto,
                                  u32 *ol_type_vlan_len_msec)
{
        u32 l2_len, l3_len, l4_len;
        unsigned char *il2_hdr;
        union l3_hdr_info l3;
        union l4_hdr_info l4;

        l3.hdr = skb_network_header(skb);
        l4.hdr = skb_transport_header(skb);

        /* compute OL2 header size, defined in 2 Bytes */
        l2_len = l3.hdr - skb->data;
        hns3_set_field(*ol_type_vlan_len_msec, HNS3_TXD_L2LEN_S, l2_len >> 1);

        /* compute OL3 header size, defined in 4 Bytes */
        l3_len = l4.hdr - l3.hdr;
        hns3_set_field(*ol_type_vlan_len_msec, HNS3_TXD_L3LEN_S, l3_len >> 2);

        il2_hdr = skb_inner_mac_header(skb);
        /* compute OL4 header size, defined in 4 Bytes */
        l4_len = il2_hdr - l4.hdr;
        hns3_set_field(*ol_type_vlan_len_msec, HNS3_TXD_L4LEN_S, l4_len >> 2);

        /* define outer network header type */
        if (skb->protocol == htons(ETH_P_IP)) {
                if (skb_is_gso(skb))
                        hns3_set_field(*ol_type_vlan_len_msec,
                                       HNS3_TXD_OL3T_S,
                                       HNS3_OL3T_IPV4_CSUM);
                else
                        hns3_set_field(*ol_type_vlan_len_msec,
                                       HNS3_TXD_OL3T_S,
                                       HNS3_OL3T_IPV4_NO_CSUM);

        } else if (skb->protocol == htons(ETH_P_IPV6)) {
                hns3_set_field(*ol_type_vlan_len_msec, HNS3_TXD_OL3T_S,
                               HNS3_OL3T_IPV6);
        }

        if (ol4_proto == IPPROTO_UDP)
                hns3_set_field(*ol_type_vlan_len_msec, HNS3_TXD_TUNTYPE_S,
                               HNS3_TUN_MAC_IN_UDP);
        else if (ol4_proto == IPPROTO_GRE)
                hns3_set_field(*ol_type_vlan_len_msec, HNS3_TXD_TUNTYPE_S,
                               HNS3_TUN_NVGRE);
}

static int hns3_set_l2l3l4(struct sk_buff *skb, u8 ol4_proto,
                           u8 il4_proto, u32 *type_cs_vlan_tso,
                           u32 *ol_type_vlan_len_msec)
{
        unsigned char *l2_hdr = skb->data;
        u32 l4_proto = ol4_proto;
        union l4_hdr_info l4;
        union l3_hdr_info l3;
        u32 l2_len, l3_len;

        l4.hdr = skb_transport_header(skb);
        l3.hdr = skb_network_header(skb);

        /* handle encapsulation skb */
        if (skb->encapsulation) {
                /* If this is a not UDP/GRE encapsulation skb */
                if (!(ol4_proto == IPPROTO_UDP || ol4_proto == IPPROTO_GRE)) {
                        /* drop the skb tunnel packet if hardware don't support,
                         * because hardware can't calculate csum when TSO.
                         */
                        if (skb_is_gso(skb))
                                return -EDOM;

                        /* the stack computes the IP header already,
                         * driver calculate l4 checksum when not TSO.
                         */
                        skb_checksum_help(skb);
                        return 0;
                }

                hns3_set_outer_l2l3l4(skb, ol4_proto, ol_type_vlan_len_msec);

                /* switch to inner header */
                l2_hdr = skb_inner_mac_header(skb);
                l3.hdr = skb_inner_network_header(skb);
                l4.hdr = skb_inner_transport_header(skb);
                l4_proto = il4_proto;
        }

        if (l3.v4->version == 4) {
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3T_S,
                               HNS3_L3T_IPV4);

                /* the stack computes the IP header already, the only time we
                 * need the hardware to recompute it is in the case of TSO.
                 */
                if (skb_is_gso(skb))
                        hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3CS_B, 1);
        } else if (l3.v6->version == 6) {
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3T_S,
                               HNS3_L3T_IPV6);
        }

        /* compute inner(/normal) L2 header size, defined in 2 Bytes */
        l2_len = l3.hdr - l2_hdr;
        hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L2LEN_S, l2_len >> 1);

        /* compute inner(/normal) L3 header size, defined in 4 Bytes */
        l3_len = l4.hdr - l3.hdr;
        hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3LEN_S, l3_len >> 2);

        /* compute inner(/normal) L4 header size, defined in 4 Bytes */
        switch (l4_proto) {
        case IPPROTO_TCP:
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4CS_B, 1);
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4T_S,
                               HNS3_L4T_TCP);
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4LEN_S,
                               l4.tcp->doff);
                break;
        case IPPROTO_UDP:
                if (hns3_tunnel_csum_bug(skb))
                        break;

                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4CS_B, 1);
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4T_S,
                               HNS3_L4T_UDP);
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4LEN_S,
                               (sizeof(struct udphdr) >> 2));
                break;
        case IPPROTO_SCTP:
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4CS_B, 1);
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4T_S,
                               HNS3_L4T_SCTP);
                hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L4LEN_S,
                               (sizeof(struct sctphdr) >> 2));
                break;
        default:
                /* drop the skb tunnel packet if hardware don't support,
                 * because hardware can't calculate csum when TSO.
                 */
                if (skb_is_gso(skb))
                        return -EDOM;

                /* the stack computes the IP header already,
                 * driver calculate l4 checksum when not TSO.
                 */
                skb_checksum_help(skb);
                return 0;
        }

        return 0;
}

static void hns3_set_txbd_baseinfo(u16 *bdtp_fe_sc_vld_ra_ri, int frag_end)
{
        /* Config bd buffer end */
        if (!!frag_end)
                hns3_set_field(*bdtp_fe_sc_vld_ra_ri, HNS3_TXD_FE_B, 1U);
        hns3_set_field(*bdtp_fe_sc_vld_ra_ri, HNS3_TXD_VLD_B, 1U);
}

static int hns3_fill_desc_vtags(struct sk_buff *skb,
                                struct hns3_enet_ring *tx_ring,
                                u32 *inner_vlan_flag,
                                u32 *out_vlan_flag,
                                u16 *inner_vtag,
                                u16 *out_vtag)
{
#define HNS3_TX_VLAN_PRIO_SHIFT 13

        struct hnae3_handle *handle = tx_ring->tqp->handle;

        /* Since HW limitation, if port based insert VLAN enabled, only one VLAN
         * header is allowed in skb, otherwise it will cause RAS error.
         */
        if (unlikely(skb_vlan_tagged_multi(skb) &&
                     handle->port_base_vlan_state ==
                     HNAE3_PORT_BASE_VLAN_ENABLE))
                return -EINVAL;

        if (skb->protocol == htons(ETH_P_8021Q) &&
            !(tx_ring->tqp->handle->kinfo.netdev->features &
            NETIF_F_HW_VLAN_CTAG_TX)) {
                /* When HW VLAN acceleration is turned off, and the stack
                 * sets the protocol to 802.1q, the driver just need to
                 * set the protocol to the encapsulated ethertype.
                 */
                skb->protocol = vlan_get_protocol(skb);
                return 0;
        }

        if (skb_vlan_tag_present(skb)) {
                u16 vlan_tag;

                vlan_tag = skb_vlan_tag_get(skb);
                vlan_tag |= (skb->priority & 0x7) << HNS3_TX_VLAN_PRIO_SHIFT;

                /* Based on hw strategy, use out_vtag in two layer tag case,
                 * and use inner_vtag in one tag case.
                 */
                if (skb->protocol == htons(ETH_P_8021Q)) {
                        if (handle->port_base_vlan_state ==
                            HNAE3_PORT_BASE_VLAN_DISABLE){

                                hns3_set_field(*out_vlan_flag,
                                               HNS3_TXD_OVLAN_B, 1);
                                *out_vtag = vlan_tag;
                        } else {
                                hns3_set_field(*inner_vlan_flag,
                                               HNS3_TXD_VLAN_B, 1);
                                *inner_vtag = vlan_tag;
                        }
                } else {
                        hns3_set_field(*inner_vlan_flag, HNS3_TXD_VLAN_B, 1);
                        *inner_vtag = vlan_tag;
                }
        } else if (skb->protocol == htons(ETH_P_8021Q)) {
                struct vlan_ethhdr *vhdr;
                int rc;

                rc = skb_cow_head(skb, 0);
                if (unlikely(rc < 0))
                        return rc;
                vhdr = (struct vlan_ethhdr *)skb->data;
                vhdr->h_vlan_TCI |= cpu_to_be16((skb->priority & 0x7)
                                        << HNS3_TX_VLAN_PRIO_SHIFT);
        }

        skb->protocol = vlan_get_protocol(skb);
        return 0;
}

static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                          unsigned int size, int frag_end,
                          enum hns_desc_type type)
{
        struct hns3_desc_cb *desc_cb = &ring->desc_cb[ring->next_to_use];
        struct hns3_desc *desc = &ring->desc[ring->next_to_use];
        struct device *dev = ring_to_dev(ring);
        struct skb_frag_struct *frag;
        unsigned int frag_buf_num;
        int k, sizeoflast;
        dma_addr_t dma;

        if (type == DESC_TYPE_SKB) {
                struct sk_buff *skb = (struct sk_buff *)priv;
                u32 ol_type_vlan_len_msec = 0;
                u32 type_cs_vlan_tso = 0;
                u32 paylen = skb->len;
                u16 inner_vtag = 0;
                u16 out_vtag = 0;
                u16 mss = 0;
                int ret;

                ret = hns3_fill_desc_vtags(skb, ring, &type_cs_vlan_tso,
                                           &ol_type_vlan_len_msec,
                                           &inner_vtag, &out_vtag);
                if (unlikely(ret))
                        return ret;

                if (skb->ip_summed == CHECKSUM_PARTIAL) {
                        u8 ol4_proto, il4_proto;

                        skb_reset_mac_len(skb);

                        ret = hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
                        if (unlikely(ret))
                                return ret;

                        ret = hns3_set_l2l3l4(skb, ol4_proto, il4_proto,
                                              &type_cs_vlan_tso,
                                              &ol_type_vlan_len_msec);
                        if (unlikely(ret))
                                return ret;

                        ret = hns3_set_tso(skb, &paylen, &mss,
                                           &type_cs_vlan_tso);
                        if (unlikely(ret))
                                return ret;
                }

                /* Set txbd */
                desc->tx.ol_type_vlan_len_msec =
                        cpu_to_le32(ol_type_vlan_len_msec);
                desc->tx.type_cs_vlan_tso_len = cpu_to_le32(type_cs_vlan_tso);
                desc->tx.paylen = cpu_to_le32(paylen);
                desc->tx.mss = cpu_to_le16(mss);
                desc->tx.vlan_tag = cpu_to_le16(inner_vtag);
                desc->tx.outer_vlan_tag = cpu_to_le16(out_vtag);

                dma = dma_map_single(dev, skb->data, size, DMA_TO_DEVICE);
        } else {
                frag = (struct skb_frag_struct *)priv;
                dma = skb_frag_dma_map(dev, frag, 0, size, DMA_TO_DEVICE);
        }

        if (unlikely(dma_mapping_error(dev, dma))) {
                ring->stats.sw_err_cnt++;
                return -ENOMEM;
        }

        desc_cb->length = size;

        if (likely(size <= HNS3_MAX_BD_SIZE)) {
                u16 bdtp_fe_sc_vld_ra_ri = 0;

                desc_cb->priv = priv;
                desc_cb->dma = dma;
                desc_cb->type = type;
                desc->addr = cpu_to_le64(dma);
                desc->tx.send_size = cpu_to_le16(size);
                hns3_set_txbd_baseinfo(&bdtp_fe_sc_vld_ra_ri, frag_end);
                desc->tx.bdtp_fe_sc_vld_ra_ri =
                        cpu_to_le16(bdtp_fe_sc_vld_ra_ri);

                ring_ptr_move_fw(ring, next_to_use);
                return 0;
        }

        frag_buf_num = hns3_tx_bd_count(size);
        sizeoflast = size & HNS3_TX_LAST_SIZE_M;
        sizeoflast = sizeoflast ? sizeoflast : HNS3_MAX_BD_SIZE;

        /* When frag size is bigger than hardware limit, split this frag */
        for (k = 0; k < frag_buf_num; k++) {
                u16 bdtp_fe_sc_vld_ra_ri = 0;

                /* The txbd's baseinfo of DESC_TYPE_PAGE & DESC_TYPE_SKB */
                desc_cb->priv = priv;
                desc_cb->dma = dma + HNS3_MAX_BD_SIZE * k;
                desc_cb->type = (type == DESC_TYPE_SKB && !k) ?
                                DESC_TYPE_SKB : DESC_TYPE_PAGE;

                /* now, fill the descriptor */
                desc->addr = cpu_to_le64(dma + HNS3_MAX_BD_SIZE * k);
                desc->tx.send_size = cpu_to_le16((k == frag_buf_num - 1) ?
                                     (u16)sizeoflast : (u16)HNS3_MAX_BD_SIZE);
                hns3_set_txbd_baseinfo(&bdtp_fe_sc_vld_ra_ri,
                                       frag_end && (k == frag_buf_num - 1) ?
                                                1 : 0);
                desc->tx.bdtp_fe_sc_vld_ra_ri =
                                cpu_to_le16(bdtp_fe_sc_vld_ra_ri);

                /* move ring pointer to next */
                ring_ptr_move_fw(ring, next_to_use);

                desc_cb = &ring->desc_cb[ring->next_to_use];
                desc = &ring->desc[ring->next_to_use];
        }

        return 0;
}

static int hns3_nic_bd_num(struct sk_buff *skb)
{
        int size = skb_headlen(skb);
        int i, bd_num;

        /* if the total len is within the max bd limit */
        if (likely(skb->len <= HNS3_MAX_BD_SIZE))
                return skb_shinfo(skb)->nr_frags + 1;

        bd_num = hns3_tx_bd_count(size);

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
                int frag_bd_num;

                size = skb_frag_size(frag);
                frag_bd_num = hns3_tx_bd_count(size);

                if (unlikely(frag_bd_num > HNS3_MAX_BD_PER_FRAG))
                        return -ENOMEM;

                bd_num += frag_bd_num;
        }

        return bd_num;
}

static unsigned int hns3_gso_hdr_len(struct sk_buff *skb)
{
        if (!skb->encapsulation)
                return skb_transport_offset(skb) + tcp_hdrlen(skb);

        return skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb);
}

/* HW need every continuous 8 buffer data to be larger than MSS,
 * we simplify it by ensuring skb_headlen + the first continuous
 * 7 frags to to be larger than gso header len + mss, and the remaining
 * continuous 7 frags to be larger than MSS except the last 7 frags.
 */
static bool hns3_skb_need_linearized(struct sk_buff *skb)
{
        int bd_limit = HNS3_MAX_BD_PER_FRAG - 1;
        unsigned int tot_len = 0;
        int i;

        for (i = 0; i < bd_limit; i++)
                tot_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);

        /* ensure headlen + the first 7 frags is greater than mss + header
         * and the first 7 frags is greater than mss.
         */
        if (((tot_len + skb_headlen(skb)) < (skb_shinfo(skb)->gso_size +
            hns3_gso_hdr_len(skb))) || (tot_len < skb_shinfo(skb)->gso_size))
                return true;

        /* ensure the remaining continuous 7 buffer is greater than mss */
        for (i = 0; i < (skb_shinfo(skb)->nr_frags - bd_limit - 1); i++) {
                tot_len -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
                tot_len += skb_frag_size(&skb_shinfo(skb)->frags[i + bd_limit]);

                if (tot_len < skb_shinfo(skb)->gso_size)
                        return true;
        }

        return false;
}

static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
                                  struct sk_buff **out_skb)
{
        struct sk_buff *skb = *out_skb;
        int bd_num;

        bd_num = hns3_nic_bd_num(skb);
        if (bd_num < 0)
                return bd_num;

        if (unlikely(bd_num > HNS3_MAX_BD_PER_FRAG)) {
                struct sk_buff *new_skb;

                if (skb_is_gso(skb) && !hns3_skb_need_linearized(skb))
                        goto out;

                bd_num = hns3_tx_bd_count(skb->len);
                if (unlikely(ring_space(ring) < bd_num))
                        return -EBUSY;
                /* manual split the send packet */
                new_skb = skb_copy(skb, GFP_ATOMIC);
                if (!new_skb)
                        return -ENOMEM;
                dev_kfree_skb_any(skb);
                *out_skb = new_skb;

                u64_stats_update_begin(&ring->syncp);
                ring->stats.tx_copy++;
                u64_stats_update_end(&ring->syncp);
        }

out:
        if (unlikely(ring_space(ring) < bd_num))
                return -EBUSY;

        return bd_num;
}

static void hns3_clear_desc(struct hns3_enet_ring *ring, int next_to_use_orig)
{
        struct device *dev = ring_to_dev(ring);
        unsigned int i;

        for (i = 0; i < ring->desc_num; i++) {
                /* check if this is where we started */
                if (ring->next_to_use == next_to_use_orig)
                        break;

                /* rollback one */
                ring_ptr_move_bw(ring, next_to_use);

                /* unmap the descriptor dma address */
                if (ring->desc_cb[ring->next_to_use].type == DESC_TYPE_SKB)
                        dma_unmap_single(dev,
                                         ring->desc_cb[ring->next_to_use].dma,
                                        ring->desc_cb[ring->next_to_use].length,
                                        DMA_TO_DEVICE);
                else if (ring->desc_cb[ring->next_to_use].length)
                        dma_unmap_page(dev,
                                       ring->desc_cb[ring->next_to_use].dma,
                                       ring->desc_cb[ring->next_to_use].length,
                                       DMA_TO_DEVICE);

                ring->desc_cb[ring->next_to_use].length = 0;
                ring->desc_cb[ring->next_to_use].dma = 0;
        }
}

netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hns3_nic_ring_data *ring_data =
                &tx_ring_data(priv, skb->queue_mapping);
        struct hns3_enet_ring *ring = ring_data->ring;
        struct netdev_queue *dev_queue;
        struct skb_frag_struct *frag;
        int next_to_use_head;
        int buf_num;
        int seg_num;
        int size;
        int ret;
        int i;

        /* Prefetch the data used later */
        prefetch(skb->data);

        buf_num = hns3_nic_maybe_stop_tx(ring, &skb);
        if (unlikely(buf_num <= 0)) {
                if (buf_num == -EBUSY) {
                        u64_stats_update_begin(&ring->syncp);
                        ring->stats.tx_busy++;
                        u64_stats_update_end(&ring->syncp);
                        goto out_net_tx_busy;
                } else if (buf_num == -ENOMEM) {
                        u64_stats_update_begin(&ring->syncp);
                        ring->stats.sw_err_cnt++;
                        u64_stats_update_end(&ring->syncp);
                }

                if (net_ratelimit())
                        netdev_err(netdev, "xmit error: %d!\n", buf_num);

                goto out_err_tx_ok;
        }

        /* No. of segments (plus a header) */
        seg_num = skb_shinfo(skb)->nr_frags + 1;
        /* Fill the first part */
        size = skb_headlen(skb);

        next_to_use_head = ring->next_to_use;

        ret = hns3_fill_desc(ring, skb, size, seg_num == 1 ? 1 : 0,
                             DESC_TYPE_SKB);
        if (unlikely(ret))
                goto fill_err;

        /* Fill the fragments */
        for (i = 1; i < seg_num; i++) {
                frag = &skb_shinfo(skb)->frags[i - 1];
                size = skb_frag_size(frag);

                ret = hns3_fill_desc(ring, frag, size,
                                     seg_num - 1 == i ? 1 : 0,
                                     DESC_TYPE_PAGE);

                if (unlikely(ret))
                        goto fill_err;
        }

        /* Complete translate all packets */
        dev_queue = netdev_get_tx_queue(netdev, ring_data->queue_index);
        netdev_tx_sent_queue(dev_queue, skb->len);

        wmb(); /* Commit all data before submit */

        hnae3_queue_xmit(ring->tqp, buf_num);

        return NETDEV_TX_OK;

fill_err:
        hns3_clear_desc(ring, next_to_use_head);

out_err_tx_ok:
        dev_kfree_skb_any(skb);
        return NETDEV_TX_OK;

out_net_tx_busy:
        netif_stop_subqueue(netdev, ring_data->queue_index);
        smp_mb(); /* Commit all data before submit */

        return NETDEV_TX_BUSY;
}

static int hns3_nic_net_set_mac_address(struct net_device *netdev, void *p)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        struct sockaddr *mac_addr = p;
        int ret;

        if (!mac_addr || !is_valid_ether_addr((const u8 *)mac_addr->sa_data))
                return -EADDRNOTAVAIL;

        if (ether_addr_equal(netdev->dev_addr, mac_addr->sa_data)) {
                netdev_info(netdev, "already using mac address %pM\n",
                            mac_addr->sa_data);
                return 0;
        }

        ret = h->ae_algo->ops->set_mac_addr(h, mac_addr->sa_data, false);
        if (ret) {
                netdev_err(netdev, "set_mac_address fail, ret=%d!\n", ret);
                return ret;
        }

        ether_addr_copy(netdev->dev_addr, mac_addr->sa_data);

        return 0;
}

static int hns3_nic_do_ioctl(struct net_device *netdev,
                             struct ifreq *ifr, int cmd)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);

        if (!netif_running(netdev))
                return -EINVAL;

        if (!h->ae_algo->ops->do_ioctl)
                return -EOPNOTSUPP;

        return h->ae_algo->ops->do_ioctl(h, ifr, cmd);
}

static int hns3_nic_set_features(struct net_device *netdev,
                                 netdev_features_t features)
{
        netdev_features_t changed = netdev->features ^ features;
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = priv->ae_handle;
        bool enable;
        int ret;

        if (changed & (NETIF_F_GRO_HW) && h->ae_algo->ops->set_gro_en) {
                enable = !!(features & NETIF_F_GRO_HW);
                ret = h->ae_algo->ops->set_gro_en(h, enable);
                if (ret)
                        return ret;
        }

        if ((changed & NETIF_F_HW_VLAN_CTAG_FILTER) &&
            h->ae_algo->ops->enable_vlan_filter) {
                enable = !!(features & NETIF_F_HW_VLAN_CTAG_FILTER);
                h->ae_algo->ops->enable_vlan_filter(h, enable);
        }

        if ((changed & NETIF_F_HW_VLAN_CTAG_RX) &&
            h->ae_algo->ops->enable_hw_strip_rxvtag) {
                enable = !!(features & NETIF_F_HW_VLAN_CTAG_RX);
                ret = h->ae_algo->ops->enable_hw_strip_rxvtag(h, enable);
                if (ret)
                        return ret;
        }

        if ((changed & NETIF_F_NTUPLE) && h->ae_algo->ops->enable_fd) {
                enable = !!(features & NETIF_F_NTUPLE);
                h->ae_algo->ops->enable_fd(h, enable);
        }

        netdev->features = features;
        return 0;
}

static void hns3_nic_get_stats64(struct net_device *netdev,
                                 struct rtnl_link_stats64 *stats)
{
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        int queue_num = priv->ae_handle->kinfo.num_tqps;
        struct hnae3_handle *handle = priv->ae_handle;
        struct hns3_enet_ring *ring;
        u64 rx_length_errors = 0;
        u64 rx_crc_errors = 0;
        u64 rx_multicast = 0;
        unsigned int start;
        u64 tx_errors = 0;
        u64 rx_errors = 0;
        unsigned int idx;
        u64 tx_bytes = 0;
        u64 rx_bytes = 0;
        u64 tx_pkts = 0;
        u64 rx_pkts = 0;
        u64 tx_drop = 0;
        u64 rx_drop = 0;

        if (test_bit(HNS3_NIC_STATE_DOWN, &priv->state))
                return;

        handle->ae_algo->ops->update_stats(handle, &netdev->stats);

        for (idx = 0; idx < queue_num; idx++) {
                /* fetch the tx stats */
                ring = priv->ring_data[idx].ring;
                do {
                        start = u64_stats_fetch_begin_irq(&ring->syncp);
                        tx_bytes += ring->stats.tx_bytes;
                        tx_pkts += ring->stats.tx_pkts;
                        tx_drop += ring->stats.sw_err_cnt;
                        tx_errors += ring->stats.sw_err_cnt;
                } while (u64_stats_fetch_retry_irq(&ring->syncp, start));

                /* fetch the rx stats */
                ring = priv->ring_data[idx + queue_num].ring;
                do {
                        start = u64_stats_fetch_begin_irq(&ring->syncp);
                        rx_bytes += ring->stats.rx_bytes;
                        rx_pkts += ring->stats.rx_pkts;
                        rx_drop += ring->stats.l2_err;
                        rx_errors += ring->stats.l2_err;
                        rx_errors += ring->stats.l3l4_csum_err;
                        rx_crc_errors += ring->stats.l2_err;
                        rx_multicast += ring->stats.rx_multicast;
                        rx_length_errors += ring->stats.err_pkt_len;
                } while (u64_stats_fetch_retry_irq(&ring->syncp, start));
        }

        stats->tx_bytes = tx_bytes;
        stats->tx_packets = tx_pkts;
        stats->rx_bytes = rx_bytes;
        stats->rx_packets = rx_pkts;

        stats->rx_errors = rx_errors;
        stats->multicast = rx_multicast;
        stats->rx_length_errors = rx_length_errors;
        stats->rx_crc_errors = rx_crc_errors;
        stats->rx_missed_errors = netdev->stats.rx_missed_errors;

        stats->tx_errors = tx_errors;
        stats->rx_dropped = rx_drop;
        stats->tx_dropped = tx_drop;
        stats->collisions = netdev->stats.collisions;
        stats->rx_over_errors = netdev->stats.rx_over_errors;
        stats->rx_frame_errors = netdev->stats.rx_frame_errors;
        stats->rx_fifo_errors = netdev->stats.rx_fifo_errors;
        stats->tx_aborted_errors = netdev->stats.tx_aborted_errors;
        stats->tx_carrier_errors = netdev->stats.tx_carrier_errors;
        stats->tx_fifo_errors = netdev->stats.tx_fifo_errors;
        stats->tx_heartbeat_errors = netdev->stats.tx_heartbeat_errors;
        stats->tx_window_errors = netdev->stats.tx_window_errors;
        stats->rx_compressed = netdev->stats.rx_compressed;
        stats->tx_compressed = netdev->stats.tx_compressed;
}

static int hns3_setup_tc(struct net_device *netdev, void *type_data)
{
        struct tc_mqprio_qopt_offload *mqprio_qopt = type_data;
        u8 *prio_tc = mqprio_qopt->qopt.prio_tc_map;
        struct hnae3_knic_private_info *kinfo;
        u8 tc = mqprio_qopt->qopt.num_tc;
        u16 mode = mqprio_qopt->mode;
        u8 hw = mqprio_qopt->qopt.hw;
        struct hnae3_handle *h;

        if (!((hw == TC_MQPRIO_HW_OFFLOAD_TCS &&
               mode == TC_MQPRIO_MODE_CHANNEL) || (!hw && tc == 0)))
                return -EOPNOTSUPP;

        if (tc > HNAE3_MAX_TC)
                return -EINVAL;

        if (!netdev)
                return -EINVAL;

        h = hns3_get_handle(netdev);
        kinfo = &h->kinfo;

        return (kinfo->dcb_ops && kinfo->dcb_ops->setup_tc) ?
                kinfo->dcb_ops->setup_tc(h, tc, prio_tc) : -EOPNOTSUPP;
}

static int hns3_nic_setup_tc(struct net_device *dev, enum tc_setup_type type,
                             void *type_data)
{
        if (type != TC_SETUP_QDISC_MQPRIO)
                return -EOPNOTSUPP;

        return hns3_setup_tc(dev, type_data);
}

static int hns3_vlan_rx_add_vid(struct net_device *netdev,
                                __be16 proto, u16 vid)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        int ret = -EIO;

        if (h->ae_algo->ops->set_vlan_filter)
                ret = h->ae_algo->ops->set_vlan_filter(h, proto, vid, false);

        return ret;
}

static int hns3_vlan_rx_kill_vid(struct net_device *netdev,
                                 __be16 proto, u16 vid)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        int ret = -EIO;

        if (h->ae_algo->ops->set_vlan_filter)
                ret = h->ae_algo->ops->set_vlan_filter(h, proto, vid, true);

        return ret;
}

static int hns3_ndo_set_vf_vlan(struct net_device *netdev, int vf, u16 vlan,
                                u8 qos, __be16 vlan_proto)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        int ret = -EIO;

        if (h->ae_algo->ops->set_vf_vlan_filter)
                ret = h->ae_algo->ops->set_vf_vlan_filter(h, vf, vlan,
                                                          qos, vlan_proto);

        return ret;
}

static int hns3_nic_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        int ret;

        if (hns3_nic_resetting(netdev))
                return -EBUSY;

        if (!h->ae_algo->ops->set_mtu)
                return -EOPNOTSUPP;

        ret = h->ae_algo->ops->set_mtu(h, new_mtu);
        if (ret)
                netdev_err(netdev, "failed to change MTU in hardware %d\n",
                           ret);
        else
                netdev->mtu = new_mtu;

        return ret;
}

static bool hns3_get_tx_timeo_queue_info(struct net_device *ndev)
{
        struct hns3_nic_priv *priv = netdev_priv(ndev);
        struct hnae3_handle *h = hns3_get_handle(ndev);
        struct hns3_enet_ring *tx_ring = NULL;
        struct napi_struct *napi;
        int timeout_queue = 0;
        int hw_head, hw_tail;
        int fbd_num, fbd_oft;
        int ebd_num, ebd_oft;
        int bd_num, bd_err;
        int ring_en, tc;
        int i;

        /* Find the stopped queue the same way the stack does */
        for (i = 0; i < ndev->num_tx_queues; i++) {
                struct netdev_queue *q;
                unsigned long trans_start;

                q = netdev_get_tx_queue(ndev, i);
                trans_start = q->trans_start;
                if (netif_xmit_stopped(q) &&
                    time_after(jiffies,
                               (trans_start + ndev->watchdog_timeo))) {
                        timeout_queue = i;
                        break;
                }
        }

        if (i == ndev->num_tx_queues) {
                netdev_info(ndev,
                            "no netdev TX timeout queue found, timeout count: %llu\n",
                            priv->tx_timeout_count);
                return false;
        }

        priv->tx_timeout_count++;

        tx_ring = priv->ring_data[timeout_queue].ring;
        napi = &tx_ring->tqp_vector->napi;

        netdev_info(ndev,
                    "tx_timeout count: %llu, queue id: %d, SW_NTU: 0x%x, SW_NTC: 0x%x, napi state: %lu\n",
                    priv->tx_timeout_count, timeout_queue, tx_ring->next_to_use,
                    tx_ring->next_to_clean, napi->state);

        netdev_info(ndev,
                    "tx_pkts: %llu, tx_bytes: %llu, io_err_cnt: %llu, sw_err_cnt: %llu\n",
                    tx_ring->stats.tx_pkts, tx_ring->stats.tx_bytes,
                    tx_ring->stats.io_err_cnt, tx_ring->stats.sw_err_cnt);

        netdev_info(ndev,
                    "seg_pkt_cnt: %llu, tx_err_cnt: %llu, restart_queue: %llu, tx_busy: %llu\n",
                    tx_ring->stats.seg_pkt_cnt, tx_ring->stats.tx_err_cnt,
                    tx_ring->stats.restart_queue, tx_ring->stats.tx_busy);

        /* When mac received many pause frames continuous, it's unable to send
         * packets, which may cause tx timeout
         */
        if (h->ae_algo->ops->update_stats &&
            h->ae_algo->ops->get_mac_pause_stats) {
                u64 tx_pause_cnt, rx_pause_cnt;

                h->ae_algo->ops->update_stats(h, &ndev->stats);
                h->ae_algo->ops->get_mac_pause_stats(h, &tx_pause_cnt,
                                                     &rx_pause_cnt);
                netdev_info(ndev, "tx_pause_cnt: %llu, rx_pause_cnt: %llu\n",
                            tx_pause_cnt, rx_pause_cnt);
        }

        hw_head = readl_relaxed(tx_ring->tqp->io_base +
                                HNS3_RING_TX_RING_HEAD_REG);
        hw_tail = readl_relaxed(tx_ring->tqp->io_base +
                                HNS3_RING_TX_RING_TAIL_REG);
        fbd_num = readl_relaxed(tx_ring->tqp->io_base +
                                HNS3_RING_TX_RING_FBDNUM_REG);
        fbd_oft = readl_relaxed(tx_ring->tqp->io_base +
                                HNS3_RING_TX_RING_OFFSET_REG);
        ebd_num = readl_relaxed(tx_ring->tqp->io_base +
                                HNS3_RING_TX_RING_EBDNUM_REG);
        ebd_oft = readl_relaxed(tx_ring->tqp->io_base +
                                HNS3_RING_TX_RING_EBD_OFFSET_REG);
        bd_num = readl_relaxed(tx_ring->tqp->io_base +
                               HNS3_RING_TX_RING_BD_NUM_REG);
        bd_err = readl_relaxed(tx_ring->tqp->io_base +
                               HNS3_RING_TX_RING_BD_ERR_REG);
        ring_en = readl_relaxed(tx_ring->tqp->io_base + HNS3_RING_EN_REG);
        tc = readl_relaxed(tx_ring->tqp->io_base + HNS3_RING_TX_RING_TC_REG);

        netdev_info(ndev,
                    "BD_NUM: 0x%x HW_HEAD: 0x%x, HW_TAIL: 0x%x, BD_ERR: 0x%x, INT: 0x%x\n",
                    bd_num, hw_head, hw_tail, bd_err,
                    readl(tx_ring->tqp_vector->mask_addr));
        netdev_info(ndev,
                    "RING_EN: 0x%x, TC: 0x%x, FBD_NUM: 0x%x FBD_OFT: 0x%x, EBD_NUM: 0x%x, EBD_OFT: 0x%x\n",
                    ring_en, tc, fbd_num, fbd_oft, ebd_num, ebd_oft);

        return true;
}

static void hns3_nic_net_timeout(struct net_device *ndev)
{
        struct hns3_nic_priv *priv = netdev_priv(ndev);
        struct hnae3_handle *h = priv->ae_handle;

        if (!hns3_get_tx_timeo_queue_info(ndev))
                return;

        /* request the reset, and let the hclge to determine
         * which reset level should be done
         */
        if (h->ae_algo->ops->reset_event)
                h->ae_algo->ops->reset_event(h->pdev, h);
}

#ifdef CONFIG_RFS_ACCEL
static int hns3_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
                              u16 rxq_index, u32 flow_id)
{
        struct hnae3_handle *h = hns3_get_handle(dev);
        struct flow_keys fkeys;

        if (!h->ae_algo->ops->add_arfs_entry)
                return -EOPNOTSUPP;

        if (skb->encapsulation)
                return -EPROTONOSUPPORT;

        if (!skb_flow_dissect_flow_keys(skb, &fkeys, 0))
                return -EPROTONOSUPPORT;

        if ((fkeys.basic.n_proto != htons(ETH_P_IP) &&
             fkeys.basic.n_proto != htons(ETH_P_IPV6)) ||
            (fkeys.basic.ip_proto != IPPROTO_TCP &&
             fkeys.basic.ip_proto != IPPROTO_UDP))
                return -EPROTONOSUPPORT;

        return h->ae_algo->ops->add_arfs_entry(h, rxq_index, flow_id, &fkeys);
}
#endif

static const struct net_device_ops hns3_nic_netdev_ops = {
        .ndo_open               = hns3_nic_net_open,
        .ndo_stop               = hns3_nic_net_stop,
        .ndo_start_xmit         = hns3_nic_net_xmit,
        .ndo_tx_timeout         = hns3_nic_net_timeout,
        .ndo_set_mac_address    = hns3_nic_net_set_mac_address,
        .ndo_do_ioctl           = hns3_nic_do_ioctl,
        .ndo_change_mtu         = hns3_nic_change_mtu,
        .ndo_set_features       = hns3_nic_set_features,
        .ndo_get_stats64        = hns3_nic_get_stats64,
        .ndo_setup_tc           = hns3_nic_setup_tc,
        .ndo_set_rx_mode        = hns3_nic_set_rx_mode,
        .ndo_vlan_rx_add_vid    = hns3_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = hns3_vlan_rx_kill_vid,
        .ndo_set_vf_vlan        = hns3_ndo_set_vf_vlan,
#ifdef CONFIG_RFS_ACCEL
        .ndo_rx_flow_steer      = hns3_rx_flow_steer,
#endif

};

bool hns3_is_phys_func(struct pci_dev *pdev)
{
        u32 dev_id = pdev->device;

        switch (dev_id) {
        case HNAE3_DEV_ID_GE:
        case HNAE3_DEV_ID_25GE:
        case HNAE3_DEV_ID_25GE_RDMA:
        case HNAE3_DEV_ID_25GE_RDMA_MACSEC:
        case HNAE3_DEV_ID_50GE_RDMA:
        case HNAE3_DEV_ID_50GE_RDMA_MACSEC:
        case HNAE3_DEV_ID_100G_RDMA_MACSEC:
                return true;
        case HNAE3_DEV_ID_100G_VF:
        case HNAE3_DEV_ID_100G_RDMA_DCB_PFC_VF:
                return false;
        default:
                dev_warn(&pdev->dev, "un-recognized pci device-id %d",
                         dev_id);
        }

        return false;
}

static void hns3_disable_sriov(struct pci_dev *pdev)
{
        /* If our VFs are assigned we cannot shut down SR-IOV
         * without causing issues, so just leave the hardware
         * available but disabled
         */
        if (pci_vfs_assigned(pdev)) {
                dev_warn(&pdev->dev,
                         "disabling driver while VFs are assigned\n");
                return;
        }

        pci_disable_sriov(pdev);
}

static void hns3_get_dev_capability(struct pci_dev *pdev,
                                    struct hnae3_ae_dev *ae_dev)
{
        if (pdev->revision >= 0x21) {
                hnae3_set_bit(ae_dev->flag, HNAE3_DEV_SUPPORT_FD_B, 1);
                hnae3_set_bit(ae_dev->flag, HNAE3_DEV_SUPPORT_GRO_B, 1);
        }
}

/* hns3_probe - Device initialization routine
 * @pdev: PCI device information struct
 * @ent: entry in hns3_pci_tbl
 *
 * hns3_probe initializes a PF identified by a pci_dev structure.
 * The OS initialization, configuring of the PF private structure,
 * and a hardware reset occur.
 *
 * Returns 0 on success, negative on failure
 */
static int hns3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct hnae3_ae_dev *ae_dev;
        int ret;

        ae_dev = devm_kzalloc(&pdev->dev, sizeof(*ae_dev), GFP_KERNEL);
        if (!ae_dev) {
                ret = -ENOMEM;
                return ret;
        }

        ae_dev->pdev = pdev;
        ae_dev->flag = ent->driver_data;
        ae_dev->reset_type = HNAE3_NONE_RESET;
        hns3_get_dev_capability(pdev, ae_dev);
        pci_set_drvdata(pdev, ae_dev);

        ret = hnae3_register_ae_dev(ae_dev);
        if (ret) {
                devm_kfree(&pdev->dev, ae_dev);
                pci_set_drvdata(pdev, NULL);
        }

        return ret;
}

/* hns3_remove - Device removal routine
 * @pdev: PCI device information struct
 */
static void hns3_remove(struct pci_dev *pdev)
{
        struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);

        if (hns3_is_phys_func(pdev) && IS_ENABLED(CONFIG_PCI_IOV))
                hns3_disable_sriov(pdev);

        hnae3_unregister_ae_dev(ae_dev);
        pci_set_drvdata(pdev, NULL);
}

/**
 * hns3_pci_sriov_configure
 * @pdev: pointer to a pci_dev structure
 * @num_vfs: number of VFs to allocate
 *
 * Enable or change the number of VFs. Called when the user updates the number
 * of VFs in sysfs.
 **/
static int hns3_pci_sriov_configure(struct pci_dev *pdev, int num_vfs)
{
        int ret;

        if (!(hns3_is_phys_func(pdev) && IS_ENABLED(CONFIG_PCI_IOV))) {
                dev_warn(&pdev->dev, "Can not config SRIOV\n");
                return -EINVAL;
        }

        if (num_vfs) {
                ret = pci_enable_sriov(pdev, num_vfs);
                if (ret)
                        dev_err(&pdev->dev, "SRIOV enable failed %d\n", ret);
                else
                        return num_vfs;
        } else if (!pci_vfs_assigned(pdev)) {
                pci_disable_sriov(pdev);
        } else {
                dev_warn(&pdev->dev,
                         "Unable to free VFs because some are assigned to VMs.\n");
        }

        return 0;
}

static void hns3_shutdown(struct pci_dev *pdev)
{
        struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);

        hnae3_unregister_ae_dev(ae_dev);
        devm_kfree(&pdev->dev, ae_dev);
        pci_set_drvdata(pdev, NULL);

        if (system_state == SYSTEM_POWER_OFF)
                pci_set_power_state(pdev, PCI_D3hot);
}

static pci_ers_result_t hns3_error_detected(struct pci_dev *pdev,
                                            pci_channel_state_t state)
{
        struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);
        pci_ers_result_t ret;

        dev_info(&pdev->dev, "PCI error detected, state(=%d)!!\n", state);

        if (state == pci_channel_io_perm_failure)
                return PCI_ERS_RESULT_DISCONNECT;

        if (!ae_dev || !ae_dev->ops) {
                dev_err(&pdev->dev,
                        "Can't recover - error happened before device initialized\n");
                return PCI_ERS_RESULT_NONE;
        }

        if (ae_dev->ops->handle_hw_ras_error)
                ret = ae_dev->ops->handle_hw_ras_error(ae_dev);
        else
                return PCI_ERS_RESULT_NONE;

        return ret;
}

static pci_ers_result_t hns3_slot_reset(struct pci_dev *pdev)
{
        struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);
        const struct hnae3_ae_ops *ops;
        enum hnae3_reset_type reset_type;
        struct device *dev = &pdev->dev;

        if (!ae_dev || !ae_dev->ops)
                return PCI_ERS_RESULT_NONE;

        ops = ae_dev->ops;
        /* request the reset */
        if (ops->reset_event) {
                if (ae_dev->hw_err_reset_req) {
                        reset_type = ops->get_reset_level(ae_dev,
                                                &ae_dev->hw_err_reset_req);
                        ops->set_default_reset_request(ae_dev, reset_type);
                        dev_info(dev, "requesting reset due to PCI error\n");
                        ops->reset_event(pdev, NULL);
                }

                return PCI_ERS_RESULT_RECOVERED;
        }

        return PCI_ERS_RESULT_DISCONNECT;
}

static void hns3_reset_prepare(struct pci_dev *pdev)
{
        struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);

        dev_info(&pdev->dev, "hns3 flr prepare\n");
        if (ae_dev && ae_dev->ops && ae_dev->ops->flr_prepare)
                ae_dev->ops->flr_prepare(ae_dev);
}

static void hns3_reset_done(struct pci_dev *pdev)
{
        struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);

        dev_info(&pdev->dev, "hns3 flr done\n");
        if (ae_dev && ae_dev->ops && ae_dev->ops->flr_done)
                ae_dev->ops->flr_done(ae_dev);
}

static const struct pci_error_handlers hns3_err_handler = {
        .error_detected = hns3_error_detected,

        .slot_reset     = hns3_slot_reset,
        .reset_prepare  = hns3_reset_prepare,
        .reset_done     = hns3_reset_done,
};

static struct pci_driver hns3_driver = {
        .name     = hns3_driver_name,
        .id_table = hns3_pci_tbl,
        .probe    = hns3_probe,
        .remove   = hns3_remove,
        .shutdown = hns3_shutdown,
        .sriov_configure = hns3_pci_sriov_configure,
        .err_handler    = &hns3_err_handler,
};

/* set default feature to hns3 */
static void hns3_set_default_feature(struct net_device *netdev)
{
        struct hnae3_handle *h = hns3_get_handle(netdev);
        struct pci_dev *pdev = h->pdev;

        netdev->priv_flags |= IFF_UNICAST_FLT;

        netdev->hw_enc_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_GSO |
                NETIF_F_GRO | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_GRE |
                NETIF_F_GSO_GRE_CSUM | NETIF_F_GSO_UDP_TUNNEL |
                NETIF_F_GSO_UDP_TUNNEL_CSUM | NETIF_F_SCTP_CRC;

        netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;

        netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;

        netdev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                NETIF_F_HW_VLAN_CTAG_FILTER |
                NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
                NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_GSO |
                NETIF_F_GRO | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_GRE |
                NETIF_F_GSO_GRE_CSUM | NETIF_F_GSO_UDP_TUNNEL |
                NETIF_F_GSO_UDP_TUNNEL_CSUM | NETIF_F_SCTP_CRC;

        netdev->vlan_features |=
                NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM |
                NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO |
                NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_GRE |
                NETIF_F_GSO_GRE_CSUM | NETIF_F_GSO_UDP_TUNNEL |
                NETIF_F_GSO_UDP_TUNNEL_CSUM | NETIF_F_SCTP_CRC;

        netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
                NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
                NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_GSO |
                NETIF_F_GRO | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_GRE |
                NETIF_F_GSO_GRE_CSUM | NETIF_F_GSO_UDP_TUNNEL |
                NETIF_F_GSO_UDP_TUNNEL_CSUM | NETIF_F_SCTP_CRC;

        if (pdev->revision >= 0x21) {
                netdev->hw_features |= NETIF_F_GRO_HW;
                netdev->features |= NETIF_F_GRO_HW;

                if (!(h->flags & HNAE3_SUPPORT_VF)) {
                        netdev->hw_features |= NETIF_F_NTUPLE;
                        netdev->features |= NETIF_F_NTUPLE;
                }
        }
}

static int hns3_alloc_buffer(struct hns3_enet_ring *ring,
                             struct hns3_desc_cb *cb)
{
        unsigned int order = hnae3_page_order(ring);
        struct page *p;

        p = dev_alloc_pages(order);
        if (!p)
                return -ENOMEM;

        cb->priv = p;
        cb->page_offset = 0;
        cb->reuse_flag = 0;
        cb->buf  = page_address(p);
        cb->length = hnae3_page_size(ring);
        cb->type = DESC_TYPE_PAGE;

        return 0;
}

static void hns3_free_buffer(struct hns3_enet_ring *ring,
                             struct hns3_desc_cb *cb)
{
        if (cb->type == DESC_TYPE_SKB)
                dev_kfree_skb_any((struct sk_buff *)cb->priv);
        else if (!HNAE3_IS_TX_RING(ring))
                put_page((struct page *)cb->priv);
        memset(cb, 0, sizeof(*cb));
}

static int hns3_map_buffer(struct hns3_enet_ring *ring, struct hns3_desc_cb *cb)
{
        cb->dma = dma_map_page(ring_to_dev(ring), cb->priv, 0,
                               cb->length, ring_to_dma_dir(ring));

        if (unlikely(dma_mapping_error(ring_to_dev(ring), cb->dma)))
                return -EIO;

        return 0;
}

static void hns3_unmap_buffer(struct hns3_enet_ring *ring,
                              struct hns3_desc_cb *cb)
{
        if (cb->type == DESC_TYPE_SKB)
                dma_unmap_single(ring_to_dev(ring), cb->dma, cb->length,
                                 ring_to_dma_dir(ring));
        else if (cb->length)
                dma_unmap_page(ring_to_dev(ring), cb->dma, cb->length,
                               ring_to_dma_dir(ring));
}

static void hns3_buffer_detach(struct hns3_enet_ring *ring, int i)
{
        hns3_unmap_buffer(ring, &ring->desc_cb[i]);
        ring->desc[i].addr = 0;
}

static void hns3_free_buffer_detach(struct hns3_enet_ring *ring, int i)
{
        struct hns3_desc_cb *cb = &ring->desc_cb[i];

        if (!ring->desc_cb[i].dma)
                return;

        hns3_buffer_detach(ring, i);
        hns3_free_buffer(ring, cb);
}

static void hns3_free_buffers(struct hns3_enet_ring *ring)
{
        int i;

        for (i = 0; i < ring->desc_num; i++)
                hns3_free_buffer_detach(ring, i);
}

/* free desc along with its attached buffer */
static void hns3_free_desc(struct hns3_enet_ring *ring)
{
        int size = ring->desc_num * sizeof(ring->desc[0]);

        hns3_free_buffers(ring);

        if (ring->desc) {
                dma_free_coherent(ring_to_dev(ring), size,
                                  ring->desc, ring->desc_dma_addr);
                ring->desc = NULL;
        }
}

static int hns3_alloc_desc(struct hns3_enet_ring *ring)
{
        int size = ring->desc_num * sizeof(ring->desc[0]);

        ring->desc = dma_alloc_coherent(ring_to_dev(ring), size,
                                        &ring->desc_dma_addr, GFP_KERNEL);
        if (!ring->desc)
                return -ENOMEM;

        return 0;
}

static int hns3_reserve_buffer_map(struct hns3_enet_ring *ring,
                                   struct hns3_desc_cb *cb)
{
        int ret;

        ret = hns3_alloc_buffer(ring, cb);
        if (ret)
                goto out;

        ret = hns3_map_buffer(ring, cb);
        if (ret)
                goto out_with_buf;

        return 0;

out_with_buf:
        hns3_free_buffer(ring, cb);
out:
        return ret;
}

static int hns3_alloc_buffer_attach(struct hns3_enet_ring *ring, int i)
{
        int ret = hns3_reserve_buffer_map(ring, &ring->desc_cb[i]);

        if (ret)
                return ret;

        ring->desc[i].addr = cpu_to_le64(ring->desc_cb[i].dma);

        return 0;
}

/* Allocate memory for raw pkg, and map with dma */
static int hns3_alloc_ring_buffers(struct hns3_enet_ring *ring)
{
        int i, j, ret;

        for (i = 0; i < ring->desc_num; i++) {
                ret = hns3_alloc_buffer_attach(ring, i);
                if (ret)
                        goto out_buffer_fail;
        }

        return 0;

out_buffer_fail:
        for (j = i - 1; j >= 0; j--)
                hns3_free_buffer_detach(ring, j);
        return ret;
}

/* detach a in-used buffer and replace with a reserved one */
static void hns3_replace_buffer(struct hns3_enet_ring *ring, int i,
                                struct hns3_desc_cb *res_cb)
{
        hns3_unmap_buffer(ring, &ring->desc_cb[i]);
        ring->desc_cb[i] = *res_cb;
        ring->desc[i].addr = cpu_to_le64(ring->desc_cb[i].dma);
        ring->desc[i].rx.bd_base_info = 0;
}

static void hns3_reuse_buffer(struct hns3_enet_ring *ring, int i)
{
        ring->desc_cb[i].reuse_flag = 0;
        ring->desc[i].addr = cpu_to_le64(ring->desc_cb[i].dma +
                                         ring->desc_cb[i].page_offset);
        ring->desc[i].rx.bd_base_info = 0;
}

static void hns3_nic_reclaim_desc(struct hns3_enet_ring *ring, int head,
                                  int *bytes, int *pkts)
{
        int ntc = ring->next_to_clean;
        struct hns3_desc_cb *desc_cb;

        while (head != ntc) {
                desc_cb = &ring->desc_cb[ntc];
                (*pkts) += (desc_cb->type == DESC_TYPE_SKB);
                (*bytes) += desc_cb->length;
                /* desc_cb will be cleaned, after hnae3_free_buffer_detach */
                hns3_free_buffer_detach(ring, ntc);

                if (++ntc == ring->desc_num)
                        ntc = 0;

                /* Issue prefetch for next Tx descriptor */
                prefetch(&ring->desc_cb[ntc]);
        }

        /* This smp_store_release() pairs with smp_load_acquire() in
         * ring_space called by hns3_nic_net_xmit.
         */
        smp_store_release(&ring->next_to_clean, ntc);
}

static int is_valid_clean_head(struct hns3_enet_ring *ring, int h)
{
        int u = ring->next_to_use;
        int c = ring->next_to_clean;

        if (unlikely(h > ring->desc_num))
                return 0;

        return u > c ? (h > c && h <= u) : (h > c || h <= u);
}

void hns3_clean_tx_ring(struct hns3_enet_ring *ring)
{
        struct net_device *netdev = ring->tqp->handle->kinfo.netdev;
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct netdev_queue *dev_queue;
        int bytes, pkts;
        int head;

        head = readl_relaxed(ring->tqp->io_base + HNS3_RING_TX_RING_HEAD_REG);
        rmb(); /* Make sure head is ready before touch any data */

        if (is_ring_empty(ring) || head == ring->next_to_clean)
                return; /* no data to poll */

        if (unlikely(!is_valid_clean_head(ring, head))) {
                netdev_err(netdev, "wrong head (%d, %d-%d)\n", head,
                           ring->next_to_use, ring->next_to_clean);

                u64_stats_update_begin(&ring->syncp);
                ring->stats.io_err_cnt++;
                u64_stats_update_end(&ring->syncp);
                return;
        }

        bytes = 0;
        pkts = 0;
        hns3_nic_reclaim_desc(ring, head, &bytes, &pkts);

        ring->tqp_vector->tx_group.total_bytes += bytes;
        ring->tqp_vector->tx_group.total_packets += pkts;

        u64_stats_update_begin(&ring->syncp);
        ring->stats.tx_bytes += bytes;
        ring->stats.tx_pkts += pkts;
        u64_stats_update_end(&ring->syncp);

        dev_queue = netdev_get_tx_queue(netdev, ring->tqp->tqp_index);
        netdev_tx_completed_queue(dev_queue, pkts, bytes);

        if (unlikely(pkts && netif_carrier_ok(netdev) &&
                     (ring_space(ring) > HNS3_MAX_BD_PER_PKT))) {
                /* Make sure that anybody stopping the queue after this
                 * sees the new next_to_clean.
                 */
                smp_mb();
                if (netif_tx_queue_stopped(dev_queue) &&
                    !test_bit(HNS3_NIC_STATE_DOWN, &priv->state)) {
                        netif_tx_wake_queue(dev_queue);
                        ring->stats.restart_queue++;
                }
        }
}

static int hns3_desc_unused(struct hns3_enet_ring *ring)
{
        int ntc = ring->next_to_clean;
        int ntu = ring->next_to_use;

        return ((ntc >= ntu) ? 0 : ring->desc_num) + ntc - ntu;
}

static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
                                      int cleand_count)
{
        struct hns3_desc_cb *desc_cb;
        struct hns3_desc_cb res_cbs;
        int i, ret;

        for (i = 0; i < cleand_count; i++) {
                desc_cb = &ring->desc_cb[ring->next_to_use];
                if (desc_cb->reuse_flag) {
                        u64_stats_update_begin(&ring->syncp);
                        ring->stats.reuse_pg_cnt++;
                        u64_stats_update_end(&ring->syncp);

                        hns3_reuse_buffer(ring, ring->next_to_use);
                } else {
                        ret = hns3_reserve_buffer_map(ring, &res_cbs);
                        if (ret) {
                                u64_stats_update_begin(&ring->syncp);
                                ring->stats.sw_err_cnt++;
                                u64_stats_update_end(&ring->syncp);

                                netdev_err(ring->tqp->handle->kinfo.netdev,
                                           "hnae reserve buffer map failed.\n");
                                break;
                        }
                        hns3_replace_buffer(ring, ring->next_to_use, &res_cbs);

                        u64_stats_update_begin(&ring->syncp);
                        ring->stats.non_reuse_pg++;
                        u64_stats_update_end(&ring->syncp);
                }

                ring_ptr_move_fw(ring, next_to_use);
        }

        wmb(); /* Make all data has been write before submit */
        writel_relaxed(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
}

static void hns3_nic_reuse_page(struct sk_buff *skb, int i,
                                struct hns3_enet_ring *ring, int pull_len,
                                struct hns3_desc_cb *desc_cb)
{
        struct hns3_desc *desc = &ring->desc[ring->next_to_clean];
        int size = le16_to_cpu(desc->rx.size);
        u32 truesize = hnae3_buf_size(ring);

        skb_add_rx_frag(skb, i, desc_cb->priv, desc_cb->page_offset + pull_len,
                        size - pull_len, truesize);

        /* Avoid re-using remote pages, or the stack is still using the page
         * when page_offset rollback to zero, flag default unreuse
         */
        if (unlikely(page_to_nid(desc_cb->priv) != numa_mem_id()) ||
            (!desc_cb->page_offset && page_count(desc_cb->priv) > 1))
                return;

        /* Move offset up to the next cache line */
        desc_cb->page_offset += truesize;

        if (desc_cb->page_offset + truesize <= hnae3_page_size(ring)) {
                desc_cb->reuse_flag = 1;
                /* Bump ref count on page before it is given */
                get_page(desc_cb->priv);
        } else if (page_count(desc_cb->priv) == 1) {
                desc_cb->reuse_flag = 1;
                desc_cb->page_offset = 0;
                get_page(desc_cb->priv);
        }
}

static int hns3_gro_complete(struct sk_buff *skb, u32 l234info)
{
        __be16 type = skb->protocol;
        struct tcphdr *th;
        int depth = 0;

        while (eth_type_vlan(type)) {
                struct vlan_hdr *vh;

                if ((depth + VLAN_HLEN) > skb_headlen(skb))
                        return -EFAULT;

                vh = (struct vlan_hdr *)(skb->data + depth);
                type = vh->h_vlan_encapsulated_proto;
                depth += VLAN_HLEN;
        }

        skb_set_network_header(skb, depth);

        if (type == htons(ETH_P_IP)) {
                const struct iphdr *iph = ip_hdr(skb);

                depth += sizeof(struct iphdr);
                skb_set_transport_header(skb, depth);
                th = tcp_hdr(skb);
                th->check = ~tcp_v4_check(skb->len - depth, iph->saddr,
                                          iph->daddr, 0);
        } else if (type == htons(ETH_P_IPV6)) {
                const struct ipv6hdr *iph = ipv6_hdr(skb);

                depth += sizeof(struct ipv6hdr);
                skb_set_transport_header(skb, depth);
                th = tcp_hdr(skb);
                th->check = ~tcp_v6_check(skb->len - depth, &iph->saddr,
                                          &iph->daddr, 0);
        } else {
                netdev_err(skb->dev,
                           "Error: FW GRO supports only IPv4/IPv6, not 0x%04x, depth: %d\n",
                           be16_to_cpu(type), depth);
                return -EFAULT;
        }

        skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
        if (th->cwr)
                skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;

        if (l234info & BIT(HNS3_RXD_GRO_FIXID_B))
                skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_FIXEDID;

        skb->csum_start = (unsigned char *)th - skb->head;
        skb->csum_offset = offsetof(struct tcphdr, check);
        skb->ip_summed = CHECKSUM_PARTIAL;
        return 0;
}

static void hns3_rx_checksum(struct hns3_enet_ring *ring, struct sk_buff *skb,
                             u32 l234info, u32 bd_base_info, u32 ol_info)
{
        struct net_device *netdev = ring->tqp->handle->kinfo.netdev;
        int l3_type, l4_type;
        int ol4_type;

        skb->ip_summed = CHECKSUM_NONE;

        skb_checksum_none_assert(skb);

        if (!(netdev->features & NETIF_F_RXCSUM))
                return;

        /* check if hardware has done checksum */
        if (!(bd_base_info & BIT(HNS3_RXD_L3L4P_B)))
                return;

        if (unlikely(l234info & (BIT(HNS3_RXD_L3E_B) | BIT(HNS3_RXD_L4E_B) |
                                 BIT(HNS3_RXD_OL3E_B) |
                                 BIT(HNS3_RXD_OL4E_B)))) {
                u64_stats_update_begin(&ring->syncp);
                ring->stats.l3l4_csum_err++;
                u64_stats_update_end(&ring->syncp);

                return;
        }

        ol4_type = hnae3_get_field(ol_info, HNS3_RXD_OL4ID_M,
                                   HNS3_RXD_OL4ID_S);
        switch (ol4_type) {
        case HNS3_OL4_TYPE_MAC_IN_UDP:
        case HNS3_OL4_TYPE_NVGRE:
                skb->csum_level = 1;
                /* fall through */
        case HNS3_OL4_TYPE_NO_TUN:
                l3_type = hnae3_get_field(l234info, HNS3_RXD_L3ID_M,
                                          HNS3_RXD_L3ID_S);
                l4_type = hnae3_get_field(l234info, HNS3_RXD_L4ID_M,
                                          HNS3_RXD_L4ID_S);

                /* Can checksum ipv4 or ipv6 + UDP/TCP/SCTP packets */
                if ((l3_type == HNS3_L3_TYPE_IPV4 ||
                     l3_type == HNS3_L3_TYPE_IPV6) &&
                    (l4_type == HNS3_L4_TYPE_UDP ||
                     l4_type == HNS3_L4_TYPE_TCP ||
                     l4_type == HNS3_L4_TYPE_SCTP))
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                break;
        default:
                break;
        }
}

static void hns3_rx_skb(struct hns3_enet_ring *ring, struct sk_buff *skb)
{
        if (skb_has_frag_list(skb))
                napi_gro_flush(&ring->tqp_vector->napi, false);

        napi_gro_receive(&ring->tqp_vector->napi, skb);
}

static bool hns3_parse_vlan_tag(struct hns3_enet_ring *ring,
                                struct hns3_desc *desc, u32 l234info,
                                u16 *vlan_tag)
{
        struct hnae3_handle *handle = ring->tqp->handle;
        struct pci_dev *pdev = ring->tqp->handle->pdev;

        if (pdev->revision == 0x20) {
                *vlan_tag = le16_to_cpu(desc->rx.ot_vlan_tag);
                if (!(*vlan_tag & VLAN_VID_MASK))
                        *vlan_tag = le16_to_cpu(desc->rx.vlan_tag);

                return (*vlan_tag != 0);
        }

#define HNS3_STRP_OUTER_VLAN    0x1
#define HNS3_STRP_INNER_VLAN    0x2
#define HNS3_STRP_BOTH          0x3

        /* Hardware always insert VLAN tag into RX descriptor when
         * remove the tag from packet, driver needs to determine
         * reporting which tag to stack.
         */
        switch (hnae3_get_field(l234info, HNS3_RXD_STRP_TAGP_M,
                                HNS3_RXD_STRP_TAGP_S)) {
        case HNS3_STRP_OUTER_VLAN:
                if (handle->port_base_vlan_state !=
                                HNAE3_PORT_BASE_VLAN_DISABLE)
                        return false;

                *vlan_tag = le16_to_cpu(desc->rx.ot_vlan_tag);
                return true;
        case HNS3_STRP_INNER_VLAN:
                if (handle->port_base_vlan_state !=
                                HNAE3_PORT_BASE_VLAN_DISABLE)
                        return false;

                *vlan_tag = le16_to_cpu(desc->rx.vlan_tag);
                return true;
        case HNS3_STRP_BOTH:
                if (handle->port_base_vlan_state ==
                                HNAE3_PORT_BASE_VLAN_DISABLE)
                        *vlan_tag = le16_to_cpu(desc->rx.ot_vlan_tag);
                else
                        *vlan_tag = le16_to_cpu(desc->rx.vlan_tag);

                return true;
        default:
                return false;
        }
}

static int hns3_alloc_skb(struct hns3_enet_ring *ring, unsigned int length,
                          unsigned char *va)
{
#define HNS3_NEED_ADD_FRAG      1
        struct hns3_desc_cb *desc_cb = &ring->desc_cb[ring->next_to_clean];
        struct net_device *netdev = ring->tqp->handle->kinfo.netdev;
        struct sk_buff *skb;

        ring->skb = napi_alloc_skb(&ring->tqp_vector->napi, HNS3_RX_HEAD_SIZE);
        skb = ring->skb;
        if (unlikely(!skb)) {
                netdev_err(netdev, "alloc rx skb fail\n");

                u64_stats_update_begin(&ring->syncp);
                ring->stats.sw_err_cnt++;
                u64_stats_update_end(&ring->syncp);

                return -ENOMEM;
        }

        prefetchw(skb->data);

        ring->pending_buf = 1;
        ring->frag_num = 0;
        ring->tail_skb = NULL;
        if (length <= HNS3_RX_HEAD_SIZE) {
                memcpy(__skb_put(skb, length), va, ALIGN(length, sizeof(long)));

                /* We can reuse buffer as-is, just make sure it is local */
                if (likely(page_to_nid(desc_cb->priv) == numa_mem_id()))
                        desc_cb->reuse_flag = 1;
                else /* This page cannot be reused so discard it */
                        put_page(desc_cb->priv);

                ring_ptr_move_fw(ring, next_to_clean);
                return 0;
        }
        u64_stats_update_begin(&ring->syncp);
        ring->stats.seg_pkt_cnt++;
        u64_stats_update_end(&ring->syncp);

        ring->pull_len = eth_get_headlen(netdev, va, HNS3_RX_HEAD_SIZE);
        __skb_put(skb, ring->pull_len);
        hns3_nic_reuse_page(skb, ring->frag_num++, ring, ring->pull_len,
                            desc_cb);
        ring_ptr_move_fw(ring, next_to_clean);

        return HNS3_NEED_ADD_FRAG;
}

static int hns3_add_frag(struct hns3_enet_ring *ring, struct hns3_desc *desc,
                         struct sk_buff **out_skb, bool pending)
{
        struct sk_buff *skb = *out_skb;
        struct sk_buff *head_skb = *out_skb;
        struct sk_buff *new_skb;
        struct hns3_desc_cb *desc_cb;
        struct hns3_desc *pre_desc;
        u32 bd_base_info;
        int pre_bd;

        /* if there is pending bd, the SW param next_to_clean has moved
         * to next and the next is NULL
         */
        if (pending) {
                pre_bd = (ring->next_to_clean - 1 + ring->desc_num) %
                         ring->desc_num;
                pre_desc = &ring->desc[pre_bd];
                bd_base_info = le32_to_cpu(pre_desc->rx.bd_base_info);
        } else {
                bd_base_info = le32_to_cpu(desc->rx.bd_base_info);
        }

        while (!(bd_base_info & BIT(HNS3_RXD_FE_B))) {
                desc = &ring->desc[ring->next_to_clean];
                desc_cb = &ring->desc_cb[ring->next_to_clean];
                bd_base_info = le32_to_cpu(desc->rx.bd_base_info);
                /* make sure HW write desc complete */
                dma_rmb();
                if (!(bd_base_info & BIT(HNS3_RXD_VLD_B)))
                        return -ENXIO;

                if (unlikely(ring->frag_num >= MAX_SKB_FRAGS)) {
                        new_skb = napi_alloc_skb(&ring->tqp_vector->napi,
                                                 HNS3_RX_HEAD_SIZE);
                        if (unlikely(!new_skb)) {
                                netdev_err(ring->tqp->handle->kinfo.netdev,
                                           "alloc rx skb frag fail\n");
                                return -ENXIO;
                        }
                        ring->frag_num = 0;

                        if (ring->tail_skb) {
                                ring->tail_skb->next = new_skb;
                                ring->tail_skb = new_skb;
                        } else {
                                skb_shinfo(skb)->frag_list = new_skb;
                                ring->tail_skb = new_skb;
                        }
                }

                if (ring->tail_skb) {
                        head_skb->truesize += hnae3_buf_size(ring);
                        head_skb->data_len += le16_to_cpu(desc->rx.size);
                        head_skb->len += le16_to_cpu(desc->rx.size);
                        skb = ring->tail_skb;
                }

                hns3_nic_reuse_page(skb, ring->frag_num++, ring, 0, desc_cb);
                ring_ptr_move_fw(ring, next_to_clean);
                ring->pending_buf++;
        }

        return 0;
}

static int hns3_set_gro_and_checksum(struct hns3_enet_ring *ring,
                                     struct sk_buff *skb, u32 l234info,
                                     u32 bd_base_info, u32 ol_info)
{
        u32 l3_type;

        skb_shinfo(skb)->gso_size = hnae3_get_field(bd_base_info,
                                                    HNS3_RXD_GRO_SIZE_M,
                                                    HNS3_RXD_GRO_SIZE_S);
        /* if there is no HW GRO, do not set gro params */
        if (!skb_shinfo(skb)->gso_size) {
                hns3_rx_checksum(ring, skb, l234info, bd_base_info, ol_info);
                return 0;
        }

        NAPI_GRO_CB(skb)->count = hnae3_get_field(l234info,
                                                  HNS3_RXD_GRO_COUNT_M,
                                                  HNS3_RXD_GRO_COUNT_S);

        l3_type = hnae3_get_field(l234info, HNS3_RXD_L3ID_M, HNS3_RXD_L3ID_S);
        if (l3_type == HNS3_L3_TYPE_IPV4)
                skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
        else if (l3_type == HNS3_L3_TYPE_IPV6)
                skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
        else
                return -EFAULT;

        return  hns3_gro_complete(skb, l234info);
}

static void hns3_set_rx_skb_rss_type(struct hns3_enet_ring *ring,
                                     struct sk_buff *skb, u32 rss_hash)
{
        struct hnae3_handle *handle = ring->tqp->handle;
        enum pkt_hash_types rss_type;

        if (rss_hash)
                rss_type = handle->kinfo.rss_type;
        else
                rss_type = PKT_HASH_TYPE_NONE;

        skb_set_hash(skb, rss_hash, rss_type);
}

static int hns3_handle_bdinfo(struct hns3_enet_ring *ring, struct sk_buff *skb)
{
        struct net_device *netdev = ring->tqp->handle->kinfo.netdev;
        enum hns3_pkt_l2t_type l2_frame_type;
        u32 bd_base_info, l234info, ol_info;
        struct hns3_desc *desc;
        unsigned int len;
        int pre_ntc, ret;

        /* bdinfo handled below is only valid on the last BD of the
         * current packet, and ring->next_to_clean indicates the first
         * descriptor of next packet, so need - 1 below.
         */
        pre_ntc = ring->next_to_clean ? (ring->next_to_clean - 1) :
                                        (ring->desc_num - 1);
        desc = &ring->desc[pre_ntc];
        bd_base_info = le32_to_cpu(desc->rx.bd_base_info);
        l234info = le32_to_cpu(desc->rx.l234_info);
        ol_info = le32_to_cpu(desc->rx.ol_info);

        /* Based on hw strategy, the tag offloaded will be stored at
         * ot_vlan_tag in two layer tag case, and stored at vlan_tag
         * in one layer tag case.
         */
        if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) {
                u16 vlan_tag;

                if (hns3_parse_vlan_tag(ring, desc, l234info, &vlan_tag))
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                               vlan_tag);
        }

        if (unlikely(!desc->rx.pkt_len || (l234info & (BIT(HNS3_RXD_TRUNCAT_B) |
                                  BIT(HNS3_RXD_L2E_B))))) {
                u64_stats_update_begin(&ring->syncp);
                if (l234info & BIT(HNS3_RXD_L2E_B))
                        ring->stats.l2_err++;
                else
                        ring->stats.err_pkt_len++;
                u64_stats_update_end(&ring->syncp);

                return -EFAULT;
        }

        len = skb->len;

        /* Do update ip stack process */
        skb->protocol = eth_type_trans(skb, netdev);

        /* This is needed in order to enable forwarding support */
        ret = hns3_set_gro_and_checksum(ring, skb, l234info,
                                        bd_base_info, ol_info);
        if (unlikely(ret)) {
                u64_stats_update_begin(&ring->syncp);
                ring->stats.rx_err_cnt++;
                u64_stats_update_end(&ring->syncp);
                return ret;
        }

        l2_frame_type = hnae3_get_field(l234info, HNS3_RXD_DMAC_M,
                                        HNS3_RXD_DMAC_S);

        u64_stats_update_begin(&ring->syncp);
        ring->stats.rx_pkts++;
        ring->stats.rx_bytes += len;

        if (l2_frame_type == HNS3_L2_TYPE_MULTICAST)
                ring->stats.rx_multicast++;

        u64_stats_update_end(&ring->syncp);

        ring->tqp_vector->rx_group.total_bytes += len;

        hns3_set_rx_skb_rss_type(ring, skb, le32_to_cpu(desc->rx.rss_hash));
        return 0;
}

static int hns3_handle_rx_bd(struct hns3_enet_ring *ring,
                             struct sk_buff **out_skb)
{
        struct sk_buff *skb = ring->skb;
        struct hns3_desc_cb *desc_cb;
        struct hns3_desc *desc;
        unsigned int length;
        u32 bd_base_info;
        int ret;

        desc = &ring->desc[ring->next_to_clean];
        desc_cb = &ring->desc_cb[ring->next_to_clean];

        prefetch(desc);

        length = le16_to_cpu(desc->rx.size);
        bd_base_info = le32_to_cpu(desc->rx.bd_base_info);

        /* Check valid BD */
        if (unlikely(!(bd_base_info & BIT(HNS3_RXD_VLD_B))))
                return -ENXIO;

        if (!skb)
                ring->va = (unsigned char *)desc_cb->buf + desc_cb->page_offset;

        /* Prefetch first cache line of first page
         * Idea is to cache few bytes of the header of the packet. Our L1 Cache
         * line size is 64B so need to prefetch twice to make it 128B. But in
         * actual we can have greater size of caches with 128B Level 1 cache
         * lines. In such a case, single fetch would suffice to cache in the
         * relevant part of the header.
         */
        prefetch(ring->va);
#if L1_CACHE_BYTES < 128
        prefetch(ring->va + L1_CACHE_BYTES);
#endif

        if (!skb) {
                ret = hns3_alloc_skb(ring, length, ring->va);
                *out_skb = skb = ring->skb;

                if (ret < 0) /* alloc buffer fail */
                        return ret;
                if (ret > 0) { /* need add frag */
                        ret = hns3_add_frag(ring, desc, &skb, false);
                        if (ret)
                                return ret;

                        /* As the head data may be changed when GRO enable, copy
                         * the head data in after other data rx completed
                         */
                        memcpy(skb->data, ring->va,
                               ALIGN(ring->pull_len, sizeof(long)));
                }
        } else {
                ret = hns3_add_frag(ring, desc, &skb, true);
                if (ret)
                        return ret;

                /* As the head data may be changed when GRO enable, copy
                 * the head data in after other data rx completed
                 */
                memcpy(skb->data, ring->va,
                       ALIGN(ring->pull_len, sizeof(long)));
        }

        ret = hns3_handle_bdinfo(ring, skb);
        if (unlikely(ret)) {
                dev_kfree_skb_any(skb);
                return ret;
        }

        skb_record_rx_queue(skb, ring->tqp->tqp_index);
        *out_skb = skb;

        return 0;
}

int hns3_clean_rx_ring(struct hns3_enet_ring *ring, int budget,
                       void (*rx_fn)(struct hns3_enet_ring *, struct sk_buff *))
{
#define RCB_NOF_ALLOC_RX_BUFF_ONCE 16
        int recv_pkts, recv_bds, clean_count, err;
        int unused_count = hns3_desc_unused(ring);
        struct sk_buff *skb = ring->skb;
        int num;

        num = readl_relaxed(ring->tqp->io_base + HNS3_RING_RX_RING_FBDNUM_REG);
        rmb(); /* Make sure num taken effect before the other data is touched */

        recv_pkts = 0, recv_bds = 0, clean_count = 0;
        num -= unused_count;
        unused_count -= ring->pending_buf;

        while (recv_pkts < budget && recv_bds < num) {
                /* Reuse or realloc buffers */
                if (clean_count + unused_count >= RCB_NOF_ALLOC_RX_BUFF_ONCE) {
                        hns3_nic_alloc_rx_buffers(ring,
                                                  clean_count + unused_count);
                        clean_count = 0;
                        unused_count = hns3_desc_unused(ring) -
                                        ring->pending_buf;
                }

                /* Poll one pkt */
                err = hns3_handle_rx_bd(ring, &skb);
                if (unlikely(!skb)) /* This fault cannot be repaired */
                        goto out;

                if (err == -ENXIO) { /* Do not get FE for the packet */
                        goto out;
                } else if (unlikely(err)) {  /* Do jump the err */
                        recv_bds += ring->pending_buf;
                        clean_count += ring->pending_buf;
                        ring->skb = NULL;
                        ring->pending_buf = 0;
                        continue;
                }

                rx_fn(ring, skb);
                recv_bds += ring->pending_buf;
                clean_count += ring->pending_buf;
                ring->skb = NULL;
                ring->pending_buf = 0;

                recv_pkts++;
        }

out:
        /* Make all data has been write before submit */
        if (clean_count + unused_count > 0)
                hns3_nic_alloc_rx_buffers(ring, clean_count + unused_count);

        return recv_pkts;
}

static bool hns3_get_new_flow_lvl(struct hns3_enet_ring_group *ring_group)
{
#define HNS3_RX_LOW_BYTE_RATE 10000
#define HNS3_RX_MID_BYTE_RATE 20000
#define HNS3_RX_ULTRA_PACKET_RATE 40

        enum hns3_flow_level_range new_flow_level;
        struct hns3_enet_tqp_vector *tqp_vector;
        int packets_per_msecs, bytes_per_msecs;
        u32 time_passed_ms;

        tqp_vector = ring_group->ring->tqp_vector;
        time_passed_ms =
                jiffies_to_msecs(jiffies - tqp_vector->last_jiffies);
        if (!time_passed_ms)
                return false;

        do_div(ring_group->total_packets, time_passed_ms);
        packets_per_msecs = ring_group->total_packets;

        do_div(ring_group->total_bytes, time_passed_ms);
        bytes_per_msecs = ring_group->total_bytes;

        new_flow_level = ring_group->coal.flow_level;

        /* Simple throttlerate management
         * 0-10MB/s   lower     (50000 ints/s)
         * 10-20MB/s   middle    (20000 ints/s)
         * 20-1249MB/s high      (18000 ints/s)
         * > 40000pps  ultra     (8000 ints/s)
         */
        switch (new_flow_level) {
        case HNS3_FLOW_LOW:
                if (bytes_per_msecs > HNS3_RX_LOW_BYTE_RATE)
                        new_flow_level = HNS3_FLOW_MID;
                break;
        case HNS3_FLOW_MID:
                if (bytes_per_msecs > HNS3_RX_MID_BYTE_RATE)
                        new_flow_level = HNS3_FLOW_HIGH;
                else if (bytes_per_msecs <= HNS3_RX_LOW_BYTE_RATE)
                        new_flow_level = HNS3_FLOW_LOW;
                break;
        case HNS3_FLOW_HIGH:
        case HNS3_FLOW_ULTRA:
        default:
                if (bytes_per_msecs <= HNS3_RX_MID_BYTE_RATE)
                        new_flow_level = HNS3_FLOW_MID;
                break;
        }