// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Intel Corporation. */

#include <linux/bpf_trace.h>
#include <net/xdp_sock_drv.h>
#include <net/xdp.h>
#include "ice.h"
#include "ice_base.h"
#include "ice_type.h"
#include "ice_xsk.h"
#include "ice_txrx.h"
#include "ice_txrx_lib.h"
#include "ice_lib.h"

static struct xdp_buff **ice_xdp_buf(struct ice_rx_ring *rx_ring, u32 idx)
{
        return &rx_ring->xdp_buf[idx];
}

/**
 * ice_qp_reset_stats - Resets all stats for rings of given index
 * @vsi: VSI that contains rings of interest
 * @q_idx: ring index in array
 */
static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx)
{
        memset(&vsi->rx_rings[q_idx]->rx_stats, 0,
               sizeof(vsi->rx_rings[q_idx]->rx_stats));
        memset(&vsi->tx_rings[q_idx]->stats, 0,
               sizeof(vsi->tx_rings[q_idx]->stats));
        if (ice_is_xdp_ena_vsi(vsi))
                memset(&vsi->xdp_rings[q_idx]->stats, 0,
                       sizeof(vsi->xdp_rings[q_idx]->stats));
}

/**
 * ice_qp_clean_rings - Cleans all the rings of a given index
 * @vsi: VSI that contains rings of interest
 * @q_idx: ring index in array
 */
static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx)
{
        ice_clean_tx_ring(vsi->tx_rings[q_idx]);
        if (ice_is_xdp_ena_vsi(vsi)) {
                synchronize_rcu();
                ice_clean_tx_ring(vsi->xdp_rings[q_idx]);
        }
        ice_clean_rx_ring(vsi->rx_rings[q_idx]);
}

/**
 * ice_qvec_toggle_napi - Enables/disables NAPI for a given q_vector
 * @vsi: VSI that has netdev
 * @q_vector: q_vector that has NAPI context
 * @enable: true for enable, false for disable
 */
static void
ice_qvec_toggle_napi(struct ice_vsi *vsi, struct ice_q_vector *q_vector,
                     bool enable)
{
        if (!vsi->netdev || !q_vector)
                return;

        if (enable)
                napi_enable(&q_vector->napi);
        else
                napi_disable(&q_vector->napi);
}

/**
 * ice_qvec_dis_irq - Mask off queue interrupt generation on given ring
 * @vsi: the VSI that contains queue vector being un-configured
 * @rx_ring: Rx ring that will have its IRQ disabled
 * @q_vector: queue vector
 */
static void
ice_qvec_dis_irq(struct ice_vsi *vsi, struct ice_rx_ring *rx_ring,
                 struct ice_q_vector *q_vector)
{
        struct ice_pf *pf = vsi->back;
        struct ice_hw *hw = &pf->hw;
        int base = vsi->base_vector;
        u16 reg;
        u32 val;

        /* QINT_TQCTL is being cleared in ice_vsi_stop_tx_ring, so handle
         * here only QINT_RQCTL
         */
        reg = rx_ring->reg_idx;
        val = rd32(hw, QINT_RQCTL(reg));
        val &= ~QINT_RQCTL_CAUSE_ENA_M;
        wr32(hw, QINT_RQCTL(reg), val);

        if (q_vector) {
                u16 v_idx = q_vector->v_idx;

                wr32(hw, GLINT_DYN_CTL(q_vector->reg_idx), 0);
                ice_flush(hw);
                synchronize_irq(pf->msix_entries[v_idx + base].vector);
        }
}

/**
 * ice_qvec_cfg_msix - Enable IRQ for given queue vector
 * @vsi: the VSI that contains queue vector
 * @q_vector: queue vector
 */
static void
ice_qvec_cfg_msix(struct ice_vsi *vsi, struct ice_q_vector *q_vector)
{
        u16 reg_idx = q_vector->reg_idx;
        struct ice_pf *pf = vsi->back;
        struct ice_hw *hw = &pf->hw;
        struct ice_tx_ring *tx_ring;
        struct ice_rx_ring *rx_ring;

        ice_cfg_itr(hw, q_vector);

        ice_for_each_tx_ring(tx_ring, q_vector->tx)
                ice_cfg_txq_interrupt(vsi, tx_ring->reg_idx, reg_idx,
                                      q_vector->tx.itr_idx);

        ice_for_each_rx_ring(rx_ring, q_vector->rx)
                ice_cfg_rxq_interrupt(vsi, rx_ring->reg_idx, reg_idx,
                                      q_vector->rx.itr_idx);

        ice_flush(hw);
}

/**
 * ice_qvec_ena_irq - Enable IRQ for given queue vector
 * @vsi: the VSI that contains queue vector
 * @q_vector: queue vector
 */
static void ice_qvec_ena_irq(struct ice_vsi *vsi, struct ice_q_vector *q_vector)
{
        struct ice_pf *pf = vsi->back;
        struct ice_hw *hw = &pf->hw;

        ice_irq_dynamic_ena(hw, vsi, q_vector);

        ice_flush(hw);
}

/**
 * ice_qp_dis - Disables a queue pair
 * @vsi: VSI of interest
 * @q_idx: ring index in array
 *
 * Returns 0 on success, negative on failure.
 */
static int ice_qp_dis(struct ice_vsi *vsi, u16 q_idx)
{
        struct ice_txq_meta txq_meta = { };
        struct ice_q_vector *q_vector;
        struct ice_tx_ring *tx_ring;
        struct ice_rx_ring *rx_ring;
        int timeout = 50;
        int err;

        if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq)
                return -EINVAL;

        tx_ring = vsi->tx_rings[q_idx];
        rx_ring = vsi->rx_rings[q_idx];
        q_vector = rx_ring->q_vector;

        while (test_and_set_bit(ICE_CFG_BUSY, vsi->state)) {
                timeout--;
                if (!timeout)
                        return -EBUSY;
                usleep_range(1000, 2000);
        }
        netif_tx_stop_queue(netdev_get_tx_queue(vsi->netdev, q_idx));

        ice_qvec_dis_irq(vsi, rx_ring, q_vector);

        ice_fill_txq_meta(vsi, tx_ring, &txq_meta);
        err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, tx_ring, &txq_meta);
        if (err)
                return err;
        if (ice_is_xdp_ena_vsi(vsi)) {
                struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_idx];

                memset(&txq_meta, 0, sizeof(txq_meta));
                ice_fill_txq_meta(vsi, xdp_ring, &txq_meta);
                err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, xdp_ring,
                                           &txq_meta);
                if (err)
                        return err;
        }
        err = ice_vsi_ctrl_one_rx_ring(vsi, false, q_idx, true);
        if (err)
                return err;

        ice_qvec_toggle_napi(vsi, q_vector, false);
        ice_qp_clean_rings(vsi, q_idx);
        ice_qp_reset_stats(vsi, q_idx);

        return 0;
}

/**
 * ice_qp_ena - Enables a queue pair
 * @vsi: VSI of interest
 * @q_idx: ring index in array
 *
 * Returns 0 on success, negative on failure.
 */
static int ice_qp_ena(struct ice_vsi *vsi, u16 q_idx)
{
        struct ice_aqc_add_tx_qgrp *qg_buf;
        struct ice_q_vector *q_vector;
        struct ice_tx_ring *tx_ring;
        struct ice_rx_ring *rx_ring;
        u16 size;
        int err;

        if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq)
                return -EINVAL;

        size = struct_size(qg_buf, txqs, 1);
        qg_buf = kzalloc(size, GFP_KERNEL);
        if (!qg_buf)
                return -ENOMEM;

        qg_buf->num_txqs = 1;

        tx_ring = vsi->tx_rings[q_idx];
        rx_ring = vsi->rx_rings[q_idx];
        q_vector = rx_ring->q_vector;

        err = ice_vsi_cfg_txq(vsi, tx_ring, qg_buf);
        if (err)
                goto free_buf;

        if (ice_is_xdp_ena_vsi(vsi)) {
                struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_idx];

                memset(qg_buf, 0, size);
                qg_buf->num_txqs = 1;
                err = ice_vsi_cfg_txq(vsi, xdp_ring, qg_buf);
                if (err)
                        goto free_buf;
                ice_set_ring_xdp(xdp_ring);
                xdp_ring->xsk_pool = ice_tx_xsk_pool(xdp_ring);
        }

        err = ice_vsi_cfg_rxq(rx_ring);
        if (err)
                goto free_buf;

        ice_qvec_cfg_msix(vsi, q_vector);

        err = ice_vsi_ctrl_one_rx_ring(vsi, true, q_idx, true);
        if (err)
                goto free_buf;

        clear_bit(ICE_CFG_BUSY, vsi->state);
        ice_qvec_toggle_napi(vsi, q_vector, true);
        ice_qvec_ena_irq(vsi, q_vector);

        netif_tx_start_queue(netdev_get_tx_queue(vsi->netdev, q_idx));
free_buf:
        kfree(qg_buf);
        return err;
}

/**
 * ice_xsk_pool_disable - disable a buffer pool region
 * @vsi: Current VSI
 * @qid: queue ID
 *
 * Returns 0 on success, negative on failure
 */
static int ice_xsk_pool_disable(struct ice_vsi *vsi, u16 qid)
{
        struct xsk_buff_pool *pool = xsk_get_pool_from_qid(vsi->netdev, qid);

        if (!pool)
                return -EINVAL;

        clear_bit(qid, vsi->af_xdp_zc_qps);
        xsk_pool_dma_unmap(pool, ICE_RX_DMA_ATTR);

        return 0;
}

/**
 * ice_xsk_pool_enable - enable a buffer pool region
 * @vsi: Current VSI
 * @pool: pointer to a requested buffer pool region
 * @qid: queue ID
 *
 * Returns 0 on success, negative on failure
 */
static int
ice_xsk_pool_enable(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
{
        int err;

        if (vsi->type != ICE_VSI_PF)
                return -EINVAL;

        if (qid >= vsi->netdev->real_num_rx_queues ||
            qid >= vsi->netdev->real_num_tx_queues)
                return -EINVAL;

        err = xsk_pool_dma_map(pool, ice_pf_to_dev(vsi->back),
                               ICE_RX_DMA_ATTR);
        if (err)
                return err;

        set_bit(qid, vsi->af_xdp_zc_qps);

        return 0;
}

/**
 * ice_xsk_pool_setup - enable/disable a buffer pool region depending on its state
 * @vsi: Current VSI
 * @pool: buffer pool to enable/associate to a ring, NULL to disable
 * @qid: queue ID
 *
 * Returns 0 on success, negative on failure
 */
int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
{
        bool if_running, pool_present = !!pool;
        int ret = 0, pool_failure = 0;

        if (!is_power_of_2(vsi->rx_rings[qid]->count) ||
            !is_power_of_2(vsi->tx_rings[qid]->count)) {
                netdev_err(vsi->netdev, "Please align ring sizes to power of 2\n");
                pool_failure = -EINVAL;
                goto failure;
        }

        if_running = netif_running(vsi->netdev) && ice_is_xdp_ena_vsi(vsi);

        if (if_running) {
                ret = ice_qp_dis(vsi, qid);
                if (ret) {
                        netdev_err(vsi->netdev, "ice_qp_dis error = %d\n", ret);
                        goto xsk_pool_if_up;
                }
        }

        pool_failure = pool_present ? ice_xsk_pool_enable(vsi, pool, qid) :
                                      ice_xsk_pool_disable(vsi, qid);

xsk_pool_if_up:
        if (if_running) {
                ret = ice_qp_ena(vsi, qid);
                if (!ret && pool_present)
                        napi_schedule(&vsi->xdp_rings[qid]->q_vector->napi);
                else if (ret)
                        netdev_err(vsi->netdev, "ice_qp_ena error = %d\n", ret);
        }

failure:
        if (pool_failure) {
                netdev_err(vsi->netdev, "Could not %sable buffer pool, error = %d\n",
                           pool_present ? "en" : "dis", pool_failure);
                return pool_failure;
        }

        return ret;
}

/**
 * ice_fill_rx_descs - pick buffers from XSK buffer pool and use it
 * @pool: XSK Buffer pool to pull the buffers from
 * @xdp: SW ring of xdp_buff that will hold the buffers
 * @rx_desc: Pointer to Rx descriptors that will be filled
 * @count: The number of buffers to allocate
 *
 * This function allocates a number of Rx buffers from the fill ring
 * or the internal recycle mechanism and places them on the Rx ring.
 *
 * Note that ring wrap should be handled by caller of this function.
 *
 * Returns the amount of allocated Rx descriptors
 */
static u16 ice_fill_rx_descs(struct xsk_buff_pool *pool, struct xdp_buff **xdp,
                             union ice_32b_rx_flex_desc *rx_desc, u16 count)
{
        dma_addr_t dma;
        u16 buffs;
        int i;

        buffs = xsk_buff_alloc_batch(pool, xdp, count);
        for (i = 0; i < buffs; i++) {
                dma = xsk_buff_xdp_get_dma(*xdp);
                rx_desc->read.pkt_addr = cpu_to_le64(dma);
                rx_desc->wb.status_error0 = 0;

                rx_desc++;
                xdp++;
        }

        return buffs;
}

/**
 * __ice_alloc_rx_bufs_zc - allocate a number of Rx buffers
 * @rx_ring: Rx ring
 * @count: The number of buffers to allocate
 *
 * Place the @count of descriptors onto Rx ring. Handle the ring wrap
 * for case where space from next_to_use up to the end of ring is less
 * than @count. Finally do a tail bump.
 *
 * Returns true if all allocations were successful, false if any fail.
 */
static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
{
        u32 nb_buffs_extra = 0, nb_buffs = 0;
        union ice_32b_rx_flex_desc *rx_desc;
        u16 ntu = rx_ring->next_to_use;
        u16 total_count = count;
        struct xdp_buff **xdp;

        rx_desc = ICE_RX_DESC(rx_ring, ntu);
        xdp = ice_xdp_buf(rx_ring, ntu);

        if (ntu + count >= rx_ring->count) {
                nb_buffs_extra = ice_fill_rx_descs(rx_ring->xsk_pool, xdp,
                                                   rx_desc,
                                                   rx_ring->count - ntu);
                if (nb_buffs_extra != rx_ring->count - ntu) {
                        ntu += nb_buffs_extra;
                        goto exit;
                }
                rx_desc = ICE_RX_DESC(rx_ring, 0);
                xdp = ice_xdp_buf(rx_ring, 0);
                ntu = 0;
                count -= nb_buffs_extra;
                ice_release_rx_desc(rx_ring, 0);
        }

        nb_buffs = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, count);

        ntu += nb_buffs;
        if (ntu == rx_ring->count)
                ntu = 0;

exit:
        if (rx_ring->next_to_use != ntu)
                ice_release_rx_desc(rx_ring, ntu);

        return total_count == (nb_buffs_extra + nb_buffs);
}

/**
 * ice_alloc_rx_bufs_zc - allocate a number of Rx buffers
 * @rx_ring: Rx ring
 * @count: The number of buffers to allocate
 *
 * Wrapper for internal allocation routine; figure out how many tail
 * bumps should take place based on the given threshold
 *
 * Returns true if all calls to internal alloc routine succeeded
 */
bool ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
{
        u16 rx_thresh = ICE_RING_QUARTER(rx_ring);
        u16 batched, leftover, i, tail_bumps;

        batched = ALIGN_DOWN(count, rx_thresh);
        tail_bumps = batched / rx_thresh;
        leftover = count & (rx_thresh - 1);

        for (i = 0; i < tail_bumps; i++)
                if (!__ice_alloc_rx_bufs_zc(rx_ring, rx_thresh))
                        return false;
        return __ice_alloc_rx_bufs_zc(rx_ring, leftover);
}

/**
 * ice_bump_ntc - Bump the next_to_clean counter of an Rx ring
 * @rx_ring: Rx ring
 */
static void ice_bump_ntc(struct ice_rx_ring *rx_ring)
{
        int ntc = rx_ring->next_to_clean + 1;

        ntc = (ntc < rx_ring->count) ? ntc : 0;
        rx_ring->next_to_clean = ntc;
        prefetch(ICE_RX_DESC(rx_ring, ntc));
}

/**
 * ice_construct_skb_zc - Create an sk_buff from zero-copy buffer
 * @rx_ring: Rx ring
 * @xdp: Pointer to XDP buffer
 *
 * This function allocates a new skb from a zero-copy Rx buffer.
 *
 * Returns the skb on success, NULL on failure.
 */
static struct sk_buff *
ice_construct_skb_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
{
        unsigned int totalsize = xdp->data_end - xdp->data_meta;
        unsigned int metasize = xdp->data - xdp->data_meta;
        struct sk_buff *skb;

        net_prefetch(xdp->data_meta);

        skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize,
                               GFP_ATOMIC | __GFP_NOWARN);
        if (unlikely(!skb))
                return NULL;

        memcpy(__skb_put(skb, totalsize), xdp->data_meta,
               ALIGN(totalsize, sizeof(long)));

        if (metasize) {
                skb_metadata_set(skb, metasize);
                __skb_pull(skb, metasize);
        }

        xsk_buff_free(xdp);
        return skb;
}

/**
 * ice_run_xdp_zc - Executes an XDP program in zero-copy path
 * @rx_ring: Rx ring
 * @xdp: xdp_buff used as input to the XDP program
 * @xdp_prog: XDP program to run
 * @xdp_ring: ring to be used for XDP_TX action
 *
 * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
 */
static int
ice_run_xdp_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
               struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring)
{
        int err, result = ICE_XDP_PASS;
        u32 act;

        act = bpf_prog_run_xdp(xdp_prog, xdp);

        if (likely(act == XDP_REDIRECT)) {
                err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
                if (!err)
                        return ICE_XDP_REDIR;
                if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS)
                        result = ICE_XDP_EXIT;
                else
                        result = ICE_XDP_CONSUMED;
                goto out_failure;
        }

        switch (act) {
        case XDP_PASS:
                break;
        case XDP_TX:
                result = ice_xmit_xdp_buff(xdp, xdp_ring);
                if (result == ICE_XDP_CONSUMED)
                        goto out_failure;
                break;
        case XDP_DROP:
                result = ICE_XDP_CONSUMED;
                break;
        default:
                bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
                fallthrough;
        case XDP_ABORTED:
                result = ICE_XDP_CONSUMED;
out_failure:
                trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
                break;
        }

        return result;
}

/**
 * ice_clean_rx_irq_zc - consumes packets from the hardware ring
 * @rx_ring: AF_XDP Rx ring
 * @budget: NAPI budget
 *
 * Returns number of processed packets on success, remaining budget on failure.
 */
int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
{
        unsigned int total_rx_bytes = 0, total_rx_packets = 0;
        struct ice_tx_ring *xdp_ring;
        unsigned int xdp_xmit = 0;
        struct bpf_prog *xdp_prog;
        bool failure = false;
        int entries_to_alloc;

        /* ZC patch is enabled only when XDP program is set,
         * so here it can not be NULL
         */
        xdp_prog = READ_ONCE(rx_ring->xdp_prog);
        xdp_ring = rx_ring->xdp_ring;

        while (likely(total_rx_packets < (unsigned int)budget)) {
                union ice_32b_rx_flex_desc *rx_desc;
                unsigned int size, xdp_res = 0;
                struct xdp_buff *xdp;
                struct sk_buff *skb;
                u16 stat_err_bits;
                u16 vlan_tag = 0;
                u16 rx_ptype;

                rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean);

                stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S);
                if (!ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits))
                        break;

                /* This memory barrier is needed to keep us from reading
                 * any other fields out of the rx_desc until we have
                 * verified the descriptor has been written back.
                 */
                dma_rmb();

                if (unlikely(rx_ring->next_to_clean == rx_ring->next_to_use))
                        break;

                xdp = *ice_xdp_buf(rx_ring, rx_ring->next_to_clean);

                size = le16_to_cpu(rx_desc->wb.pkt_len) &
                                   ICE_RX_FLX_DESC_PKT_LEN_M;
                if (!size) {
                        xdp->data = NULL;
                        xdp->data_end = NULL;
                        xdp->data_hard_start = NULL;
                        xdp->data_meta = NULL;
                        goto construct_skb;
                }

                xsk_buff_set_size(xdp, size);
                xsk_buff_dma_sync_for_cpu(xdp, rx_ring->xsk_pool);

                xdp_res = ice_run_xdp_zc(rx_ring, xdp, xdp_prog, xdp_ring);
                if (likely(xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR))) {
                        xdp_xmit |= xdp_res;
                } else if (xdp_res == ICE_XDP_EXIT) {
                        failure = true;
                        break;
                } else if (xdp_res == ICE_XDP_CONSUMED) {
                        xsk_buff_free(xdp);
                } else if (xdp_res == ICE_XDP_PASS) {
                        goto construct_skb;
                }

                total_rx_bytes += size;
                total_rx_packets++;

                ice_bump_ntc(rx_ring);
                continue;

construct_skb:
                /* XDP_PASS path */
                skb = ice_construct_skb_zc(rx_ring, xdp);
                if (!skb) {
                        rx_ring->rx_stats.alloc_buf_failed++;
                        break;
                }

                ice_bump_ntc(rx_ring);

                if (eth_skb_pad(skb)) {
                        skb = NULL;
                        continue;
                }

                total_rx_bytes += skb->len;
                total_rx_packets++;

                vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);

                rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &
                                       ICE_RX_FLEX_DESC_PTYPE_M;

                ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
                ice_receive_skb(rx_ring, skb, vlan_tag);
        }

        entries_to_alloc = ICE_DESC_UNUSED(rx_ring);
        if (entries_to_alloc > ICE_RING_QUARTER(rx_ring))
                failure |= !ice_alloc_rx_bufs_zc(rx_ring, entries_to_alloc);

        ice_finalize_xdp_rx(xdp_ring, xdp_xmit);
        ice_update_rx_ring_stats(rx_ring, total_rx_packets, total_rx_bytes);

        if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
                if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)
                        xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
                else
                        xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);

                return (int)total_rx_packets;
        }

        return failure ? budget : (int)total_rx_packets;
}

/**
 * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer
 * @xdp_ring: XDP Tx ring
 * @tx_buf: Tx buffer to clean
 */
static void
ice_clean_xdp_tx_buf(struct ice_tx_ring *xdp_ring, struct ice_tx_buf *tx_buf)
{
        xdp_return_frame((struct xdp_frame *)tx_buf->raw_buf);
        xdp_ring->xdp_tx_active--;
        dma_unmap_single(xdp_ring->dev, dma_unmap_addr(tx_buf, dma),
                         dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);
        dma_unmap_len_set(tx_buf, len, 0);
}

/**
 * ice_clean_xdp_irq_zc - Reclaim resources after transmit completes on XDP ring
 * @xdp_ring: XDP ring to clean
 * @napi_budget: amount of descriptors that NAPI allows us to clean
 *
 * Returns count of cleaned descriptors
 */
static u16 ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring, int napi_budget)
{
        u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
        int budget = napi_budget / tx_thresh;
        u16 next_dd = xdp_ring->next_dd;
        u16 ntc, cleared_dds = 0;

        do {
                struct ice_tx_desc *next_dd_desc;
                u16 desc_cnt = xdp_ring->count;
                struct ice_tx_buf *tx_buf;
                u32 xsk_frames;
                u16 i;

                next_dd_desc = ICE_TX_DESC(xdp_ring, next_dd);
                if (!(next_dd_desc->cmd_type_offset_bsz &
                    cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
                        break;

                cleared_dds++;
                xsk_frames = 0;
                if (likely(!xdp_ring->xdp_tx_active)) {
                        xsk_frames = tx_thresh;
                        goto skip;
                }

                ntc = xdp_ring->next_to_clean;

                for (i = 0; i < tx_thresh; i++) {
                        tx_buf = &xdp_ring->tx_buf[ntc];

                        if (tx_buf->raw_buf) {
                                ice_clean_xdp_tx_buf(xdp_ring, tx_buf);
                                tx_buf->raw_buf = NULL;
                        } else {
                                xsk_frames++;
                        }

                        ntc++;
                        if (ntc >= xdp_ring->count)
                                ntc = 0;
                }
skip:
                xdp_ring->next_to_clean += tx_thresh;
                if (xdp_ring->next_to_clean >= desc_cnt)
                        xdp_ring->next_to_clean -= desc_cnt;
                if (xsk_frames)
                        xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
                next_dd_desc->cmd_type_offset_bsz = 0;
                next_dd = next_dd + tx_thresh;
                if (next_dd >= desc_cnt)
                        next_dd = tx_thresh - 1;
        } while (--budget);

        xdp_ring->next_dd = next_dd;

        return cleared_dds * tx_thresh;
}

/**
 * ice_xmit_pkt - produce a single HW Tx descriptor out of AF_XDP descriptor
 * @xdp_ring: XDP ring to produce the HW Tx descriptor on
 * @desc: AF_XDP descriptor to pull the DMA address and length from
 * @total_bytes: bytes accumulator that will be used for stats update
 */
static void ice_xmit_pkt(struct ice_tx_ring *xdp_ring, struct xdp_desc *desc,
                         unsigned int *total_bytes)
{
        struct ice_tx_desc *tx_desc;
        dma_addr_t dma;

        dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
        xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);

        tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
        tx_desc->buf_addr = cpu_to_le64(dma);
        tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP,
                                                      0, desc->len, 0);

        *total_bytes += desc->len;
}

/**
 * ice_xmit_pkt_batch - produce a batch of HW Tx descriptors out of AF_XDP descriptors
 * @xdp_ring: XDP ring to produce the HW Tx descriptors on
 * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from
 * @total_bytes: bytes accumulator that will be used for stats update
 */
static void ice_xmit_pkt_batch(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs,
                               unsigned int *total_bytes)
{
        u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
        u16 ntu = xdp_ring->next_to_use;
        struct ice_tx_desc *tx_desc;
        u32 i;

        loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
                dma_addr_t dma;

                dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, descs[i].addr);
                xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, descs[i].len);

                tx_desc = ICE_TX_DESC(xdp_ring, ntu++);
                tx_desc->buf_addr = cpu_to_le64(dma);
                tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP,
                                                              0, descs[i].len, 0);

                *total_bytes += descs[i].len;
        }

        xdp_ring->next_to_use = ntu;

        if (xdp_ring->next_to_use > xdp_ring->next_rs) {
                tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
                tx_desc->cmd_type_offset_bsz |=
                        cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
                xdp_ring->next_rs += tx_thresh;
        }
}

/**
 * ice_fill_tx_hw_ring - produce the number of Tx descriptors onto ring
 * @xdp_ring: XDP ring to produce the HW Tx descriptors on
 * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from
 * @nb_pkts: count of packets to be send
 * @total_bytes: bytes accumulator that will be used for stats update
 */
static void ice_fill_tx_hw_ring(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs,
                                u32 nb_pkts, unsigned int *total_bytes)
{
        u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
        u32 batched, leftover, i;

        batched = ALIGN_DOWN(nb_pkts, PKTS_PER_BATCH);
        leftover = nb_pkts & (PKTS_PER_BATCH - 1);
        for (i = 0; i < batched; i += PKTS_PER_BATCH)
                ice_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
        for (; i < batched + leftover; i++)
                ice_xmit_pkt(xdp_ring, &descs[i], total_bytes);

        if (xdp_ring->next_to_use > xdp_ring->next_rs) {
                struct ice_tx_desc *tx_desc;

                tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
                tx_desc->cmd_type_offset_bsz |=
                        cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
                xdp_ring->next_rs += tx_thresh;
        }
}

/**
 * ice_xmit_zc - take entries from XSK Tx ring and place them onto HW Tx ring
 * @xdp_ring: XDP ring to produce the HW Tx descriptors on
 * @budget: number of free descriptors on HW Tx ring that can be used
 * @napi_budget: amount of descriptors that NAPI allows us to clean
 *
 * Returns true if there is no more work that needs to be done, false otherwise
 */
bool ice_xmit_zc(struct ice_tx_ring *xdp_ring, u32 budget, int napi_budget)
{
        struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;
        u16 tx_thresh = ICE_RING_QUARTER(xdp_ring);
        u32 nb_pkts, nb_processed = 0;
        unsigned int total_bytes = 0;

        if (budget < tx_thresh)
                budget += ice_clean_xdp_irq_zc(xdp_ring, napi_budget);

        nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);
        if (!nb_pkts)
                return true;

        if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
                struct ice_tx_desc *tx_desc;

                nb_processed = xdp_ring->count - xdp_ring->next_to_use;
                ice_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
                tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_rs);
                tx_desc->cmd_type_offset_bsz |=
                        cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
                xdp_ring->next_rs = tx_thresh - 1;
                xdp_ring->next_to_use = 0;
        }

        ice_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
                            &total_bytes);

        ice_xdp_ring_update_tail(xdp_ring);
        ice_update_tx_ring_stats(xdp_ring, nb_pkts, total_bytes);

        if (xsk_uses_need_wakeup(xdp_ring->xsk_pool))
                xsk_set_tx_need_wakeup(xdp_ring->xsk_pool);

        return nb_pkts < budget;
}

/**
 * ice_xsk_wakeup - Implements ndo_xsk_wakeup
 * @netdev: net_device
 * @queue_id: queue to wake up
 * @flags: ignored in our case, since we have Rx and Tx in the same NAPI
 *
 * Returns negative on error, zero otherwise.
 */
int
ice_xsk_wakeup(struct net_device *netdev, u32 queue_id,
               u32 __always_unused flags)
{
        struct ice_netdev_priv *np = netdev_priv(netdev);
        struct ice_q_vector *q_vector;
        struct ice_vsi *vsi = np->vsi;
        struct ice_tx_ring *ring;

        if (test_bit(ICE_VSI_DOWN, vsi->state))
                return -ENETDOWN;

        if (!ice_is_xdp_ena_vsi(vsi))
                return -EINVAL;

        if (queue_id >= vsi->num_txq)
                return -EINVAL;

        if (!vsi->xdp_rings[queue_id]->xsk_pool)
                return -EINVAL;

        ring = vsi->xdp_rings[queue_id];

        /* The idea here is that if NAPI is running, mark a miss, so
         * it will run again. If not, trigger an interrupt and
         * schedule the NAPI from interrupt context. If NAPI would be
         * scheduled here, the interrupt affinity would not be
         * honored.
         */
        q_vector = ring->q_vector;
        if (!napi_if_scheduled_mark_missed(&q_vector->napi))
                ice_trigger_sw_intr(&vsi->back->hw, q_vector);

        return 0;
}

/**
 * ice_xsk_any_rx_ring_ena - Checks if Rx rings have AF_XDP buff pool attached
 * @vsi: VSI to be checked
 *
 * Returns true if any of the Rx rings has an AF_XDP buff pool attached
 */
bool ice_xsk_any_rx_ring_ena(struct ice_vsi *vsi)
{
        int i;

        ice_for_each_rxq(vsi, i) {
                if (xsk_get_pool_from_qid(vsi->netdev, i))
                        return true;
        }

        return false;
}

/**
 * ice_xsk_clean_rx_ring - clean buffer pool queues connected to a given Rx ring
 * @rx_ring: ring to be cleaned
 */
void ice_xsk_clean_rx_ring(struct ice_rx_ring *rx_ring)
{
        u16 count_mask = rx_ring->count - 1;
        u16 ntc = rx_ring->next_to_clean;
        u16 ntu = rx_ring->next_to_use;

        for ( ; ntc != ntu; ntc = (ntc + 1) & count_mask) {
                struct xdp_buff *xdp = *ice_xdp_buf(rx_ring, ntc);

                xsk_buff_free(xdp);
        }

}

/**
 * ice_xsk_clean_xdp_ring - Clean the XDP Tx ring and its buffer pool queues
 * @xdp_ring: XDP_Tx ring
 */
void ice_xsk_clean_xdp_ring(struct ice_tx_ring *xdp_ring)
{
        u16 ntc = xdp_ring->next_to_clean, ntu = xdp_ring->next_to_use;
        u32 xsk_frames = 0;

        while (ntc != ntu) {
                struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc];

                if (tx_buf->raw_buf)
                        ice_clean_xdp_tx_buf(xdp_ring, tx_buf);
                else
                        xsk_frames++;

                tx_buf->raw_buf = NULL;

                ntc++;
                if (ntc >= xdp_ring->count)
                        ntc = 0;
        }

        if (xsk_frames)
                xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
}