/*
 * Huawei HiNIC PCI Express Linux driver
 * Copyright(c) 2017 Huawei Technologies Co., Ltd
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/sizes.h>
#include <linux/atomic.h>
#include <linux/skbuff.h>
#include <linux/io.h>
#include <asm/barrier.h>
#include <asm/byteorder.h>

#include "hinic_common.h"
#include "hinic_hw_if.h"
#include "hinic_hw_wqe.h"
#include "hinic_hw_wq.h"
#include "hinic_hw_qp_ctxt.h"
#include "hinic_hw_qp.h"
#include "hinic_hw_io.h"

#define SQ_DB_OFF               SZ_2K

/* The number of cache line to prefetch Until threshold state */
#define WQ_PREFETCH_MAX         2
/* The number of cache line to prefetch After threshold state */
#define WQ_PREFETCH_MIN         1
/* Threshold state */
#define WQ_PREFETCH_THRESHOLD   256

/* sizes of the SQ/RQ ctxt */
#define Q_CTXT_SIZE             48
#define CTXT_RSVD               240

#define SQ_CTXT_OFFSET(max_sqs, max_rqs, q_id)  \
                (((max_rqs) + (max_sqs)) * CTXT_RSVD + (q_id) * Q_CTXT_SIZE)

#define RQ_CTXT_OFFSET(max_sqs, max_rqs, q_id)  \
                (((max_rqs) + (max_sqs)) * CTXT_RSVD + \
                 (max_sqs + (q_id)) * Q_CTXT_SIZE)

#define SIZE_16BYTES(size)              (ALIGN(size, 16) >> 4)
#define SIZE_8BYTES(size)               (ALIGN(size, 8) >> 3)
#define SECT_SIZE_FROM_8BYTES(size)     ((size) << 3)

#define SQ_DB_PI_HI_SHIFT       8
#define SQ_DB_PI_HI(prod_idx)   ((prod_idx) >> SQ_DB_PI_HI_SHIFT)

#define SQ_DB_PI_LOW_MASK       0xFF
#define SQ_DB_PI_LOW(prod_idx)  ((prod_idx) & SQ_DB_PI_LOW_MASK)

#define SQ_DB_ADDR(sq, pi)      ((u64 *)((sq)->db_base) + SQ_DB_PI_LOW(pi))

#define SQ_MASKED_IDX(sq, idx)  ((idx) & (sq)->wq->mask)
#define RQ_MASKED_IDX(rq, idx)  ((idx) & (rq)->wq->mask)

#define TX_MAX_MSS_DEFAULT      0x3E00

enum sq_wqe_type {
        SQ_NORMAL_WQE = 0,
};

enum rq_completion_fmt {
        RQ_COMPLETE_SGE = 1
};

void hinic_qp_prepare_header(struct hinic_qp_ctxt_header *qp_ctxt_hdr,
                             enum hinic_qp_ctxt_type ctxt_type,
                             u16 num_queues, u16 max_queues)
{
        u16 max_sqs = max_queues;
        u16 max_rqs = max_queues;

        qp_ctxt_hdr->num_queues = num_queues;
        qp_ctxt_hdr->queue_type = ctxt_type;

        if (ctxt_type == HINIC_QP_CTXT_TYPE_SQ)
                qp_ctxt_hdr->addr_offset = SQ_CTXT_OFFSET(max_sqs, max_rqs, 0);
        else
                qp_ctxt_hdr->addr_offset = RQ_CTXT_OFFSET(max_sqs, max_rqs, 0);

        qp_ctxt_hdr->addr_offset = SIZE_16BYTES(qp_ctxt_hdr->addr_offset);

        hinic_cpu_to_be32(qp_ctxt_hdr, sizeof(*qp_ctxt_hdr));
}

void hinic_sq_prepare_ctxt(struct hinic_sq_ctxt *sq_ctxt,
                           struct hinic_sq *sq, u16 global_qid)
{
        u32 wq_page_pfn_hi, wq_page_pfn_lo, wq_block_pfn_hi, wq_block_pfn_lo;
        u64 wq_page_addr, wq_page_pfn, wq_block_pfn;
        u16 pi_start, ci_start;
        struct hinic_wq *wq;

        wq = sq->wq;
        ci_start = atomic_read(&wq->cons_idx);
        pi_start = atomic_read(&wq->prod_idx);

        /* Read the first page paddr from the WQ page paddr ptrs */
        wq_page_addr = be64_to_cpu(*wq->block_vaddr);

        wq_page_pfn = HINIC_WQ_PAGE_PFN(wq_page_addr);
        wq_page_pfn_hi = upper_32_bits(wq_page_pfn);
        wq_page_pfn_lo = lower_32_bits(wq_page_pfn);

        wq_block_pfn = HINIC_WQ_BLOCK_PFN(wq->block_paddr);
        wq_block_pfn_hi = upper_32_bits(wq_block_pfn);
        wq_block_pfn_lo = lower_32_bits(wq_block_pfn);

        sq_ctxt->ceq_attr = HINIC_SQ_CTXT_CEQ_ATTR_SET(global_qid,
                                                       GLOBAL_SQ_ID) |
                            HINIC_SQ_CTXT_CEQ_ATTR_SET(0, EN);

        sq_ctxt->ci_wrapped = HINIC_SQ_CTXT_CI_SET(ci_start, IDX) |
                              HINIC_SQ_CTXT_CI_SET(1, WRAPPED);

        sq_ctxt->wq_hi_pfn_pi =
                        HINIC_SQ_CTXT_WQ_PAGE_SET(wq_page_pfn_hi, HI_PFN) |
                        HINIC_SQ_CTXT_WQ_PAGE_SET(pi_start, PI);

        sq_ctxt->wq_lo_pfn = wq_page_pfn_lo;

        sq_ctxt->pref_cache =
                HINIC_SQ_CTXT_PREF_SET(WQ_PREFETCH_MIN, CACHE_MIN) |
                HINIC_SQ_CTXT_PREF_SET(WQ_PREFETCH_MAX, CACHE_MAX) |
                HINIC_SQ_CTXT_PREF_SET(WQ_PREFETCH_THRESHOLD, CACHE_THRESHOLD);

        sq_ctxt->pref_wrapped = 1;

        sq_ctxt->pref_wq_hi_pfn_ci =
                HINIC_SQ_CTXT_PREF_SET(ci_start, CI) |
                HINIC_SQ_CTXT_PREF_SET(wq_page_pfn_hi, WQ_HI_PFN);

        sq_ctxt->pref_wq_lo_pfn = wq_page_pfn_lo;

        sq_ctxt->wq_block_hi_pfn =
                HINIC_SQ_CTXT_WQ_BLOCK_SET(wq_block_pfn_hi, HI_PFN);

        sq_ctxt->wq_block_lo_pfn = wq_block_pfn_lo;

        hinic_cpu_to_be32(sq_ctxt, sizeof(*sq_ctxt));
}

void hinic_rq_prepare_ctxt(struct hinic_rq_ctxt *rq_ctxt,
                           struct hinic_rq *rq, u16 global_qid)
{
        u32 wq_page_pfn_hi, wq_page_pfn_lo, wq_block_pfn_hi, wq_block_pfn_lo;
        u64 wq_page_addr, wq_page_pfn, wq_block_pfn;
        u16 pi_start, ci_start;
        struct hinic_wq *wq;

        wq = rq->wq;
        ci_start = atomic_read(&wq->cons_idx);
        pi_start = atomic_read(&wq->prod_idx);

        /* Read the first page paddr from the WQ page paddr ptrs */
        wq_page_addr = be64_to_cpu(*wq->block_vaddr);

        wq_page_pfn = HINIC_WQ_PAGE_PFN(wq_page_addr);
        wq_page_pfn_hi = upper_32_bits(wq_page_pfn);
        wq_page_pfn_lo = lower_32_bits(wq_page_pfn);

        wq_block_pfn = HINIC_WQ_BLOCK_PFN(wq->block_paddr);
        wq_block_pfn_hi = upper_32_bits(wq_block_pfn);
        wq_block_pfn_lo = lower_32_bits(wq_block_pfn);

        rq_ctxt->ceq_attr = HINIC_RQ_CTXT_CEQ_ATTR_SET(0, EN) |
                            HINIC_RQ_CTXT_CEQ_ATTR_SET(1, WRAPPED);

        rq_ctxt->pi_intr_attr = HINIC_RQ_CTXT_PI_SET(pi_start, IDX) |
                                HINIC_RQ_CTXT_PI_SET(rq->msix_entry, INTR);

        rq_ctxt->wq_hi_pfn_ci = HINIC_RQ_CTXT_WQ_PAGE_SET(wq_page_pfn_hi,
                                                          HI_PFN) |
                                HINIC_RQ_CTXT_WQ_PAGE_SET(ci_start, CI);

        rq_ctxt->wq_lo_pfn = wq_page_pfn_lo;

        rq_ctxt->pref_cache =
                HINIC_RQ_CTXT_PREF_SET(WQ_PREFETCH_MIN, CACHE_MIN) |
                HINIC_RQ_CTXT_PREF_SET(WQ_PREFETCH_MAX, CACHE_MAX) |
                HINIC_RQ_CTXT_PREF_SET(WQ_PREFETCH_THRESHOLD, CACHE_THRESHOLD);

        rq_ctxt->pref_wrapped = 1;

        rq_ctxt->pref_wq_hi_pfn_ci =
                HINIC_RQ_CTXT_PREF_SET(wq_page_pfn_hi, WQ_HI_PFN) |
                HINIC_RQ_CTXT_PREF_SET(ci_start, CI);

        rq_ctxt->pref_wq_lo_pfn = wq_page_pfn_lo;

        rq_ctxt->pi_paddr_hi = upper_32_bits(rq->pi_dma_addr);
        rq_ctxt->pi_paddr_lo = lower_32_bits(rq->pi_dma_addr);

        rq_ctxt->wq_block_hi_pfn =
                HINIC_RQ_CTXT_WQ_BLOCK_SET(wq_block_pfn_hi, HI_PFN);

        rq_ctxt->wq_block_lo_pfn = wq_block_pfn_lo;

        hinic_cpu_to_be32(rq_ctxt, sizeof(*rq_ctxt));
}

/**
 * alloc_sq_skb_arr - allocate sq array for saved skb
 * @sq: HW Send Queue
 *
 * Return 0 - Success, negative - Failure
 **/
static int alloc_sq_skb_arr(struct hinic_sq *sq)
{
        struct hinic_wq *wq = sq->wq;
        size_t skb_arr_size;

        skb_arr_size = wq->q_depth * sizeof(*sq->saved_skb);
        sq->saved_skb = vzalloc(skb_arr_size);
        if (!sq->saved_skb)
                return -ENOMEM;

        return 0;
}

/**
 * free_sq_skb_arr - free sq array for saved skb
 * @sq: HW Send Queue
 **/
static void free_sq_skb_arr(struct hinic_sq *sq)
{
        vfree(sq->saved_skb);
}

/**
 * alloc_rq_skb_arr - allocate rq array for saved skb
 * @rq: HW Receive Queue
 *
 * Return 0 - Success, negative - Failure
 **/
static int alloc_rq_skb_arr(struct hinic_rq *rq)
{
        struct hinic_wq *wq = rq->wq;
        size_t skb_arr_size;

        skb_arr_size = wq->q_depth * sizeof(*rq->saved_skb);
        rq->saved_skb = vzalloc(skb_arr_size);
        if (!rq->saved_skb)
                return -ENOMEM;

        return 0;
}

/**
 * free_rq_skb_arr - free rq array for saved skb
 * @rq: HW Receive Queue
 **/
static void free_rq_skb_arr(struct hinic_rq *rq)
{
        vfree(rq->saved_skb);
}

/**
 * hinic_init_sq - Initialize HW Send Queue
 * @sq: HW Send Queue
 * @hwif: HW Interface for accessing HW
 * @wq: Work Queue for the data of the SQ
 * @entry: msix entry for sq
 * @ci_addr: address for reading the current HW consumer index
 * @ci_dma_addr: dma address for reading the current HW consumer index
 * @db_base: doorbell base address
 *
 * Return 0 - Success, negative - Failure
 **/
int hinic_init_sq(struct hinic_sq *sq, struct hinic_hwif *hwif,
                  struct hinic_wq *wq, struct msix_entry *entry,
                  void *ci_addr, dma_addr_t ci_dma_addr,
                  void __iomem *db_base)
{
        sq->hwif = hwif;

        sq->wq = wq;

        sq->irq = entry->vector;
        sq->msix_entry = entry->entry;

        sq->hw_ci_addr = ci_addr;
        sq->hw_ci_dma_addr = ci_dma_addr;

        sq->db_base = db_base + SQ_DB_OFF;

        return alloc_sq_skb_arr(sq);
}

/**
 * hinic_clean_sq - Clean HW Send Queue's Resources
 * @sq: Send Queue
 **/
void hinic_clean_sq(struct hinic_sq *sq)
{
        free_sq_skb_arr(sq);
}

/**
 * alloc_rq_cqe - allocate rq completion queue elements
 * @rq: HW Receive Queue
 *
 * Return 0 - Success, negative - Failure
 **/
static int alloc_rq_cqe(struct hinic_rq *rq)
{
        struct hinic_hwif *hwif = rq->hwif;
        struct pci_dev *pdev = hwif->pdev;
        size_t cqe_dma_size, cqe_size;
        struct hinic_wq *wq = rq->wq;
        int j, i;

        cqe_size = wq->q_depth * sizeof(*rq->cqe);
        rq->cqe = vzalloc(cqe_size);
        if (!rq->cqe)
                return -ENOMEM;

        cqe_dma_size = wq->q_depth * sizeof(*rq->cqe_dma);
        rq->cqe_dma = vzalloc(cqe_dma_size);
        if (!rq->cqe_dma)
                goto err_cqe_dma_arr_alloc;

        for (i = 0; i < wq->q_depth; i++) {
                rq->cqe[i] = dma_zalloc_coherent(&pdev->dev,
                                                 sizeof(*rq->cqe[i]),
                                                 &rq->cqe_dma[i], GFP_KERNEL);
                if (!rq->cqe[i])
                        goto err_cqe_alloc;
        }

        return 0;

err_cqe_alloc:
        for (j = 0; j < i; j++)
                dma_free_coherent(&pdev->dev, sizeof(*rq->cqe[j]), rq->cqe[j],
                                  rq->cqe_dma[j]);

        vfree(rq->cqe_dma);

err_cqe_dma_arr_alloc:
        vfree(rq->cqe);
        return -ENOMEM;
}

/**
 * free_rq_cqe - free rq completion queue elements
 * @rq: HW Receive Queue
 **/
static void free_rq_cqe(struct hinic_rq *rq)
{
        struct hinic_hwif *hwif = rq->hwif;
        struct pci_dev *pdev = hwif->pdev;
        struct hinic_wq *wq = rq->wq;
        int i;

        for (i = 0; i < wq->q_depth; i++)
                dma_free_coherent(&pdev->dev, sizeof(*rq->cqe[i]), rq->cqe[i],
                                  rq->cqe_dma[i]);

        vfree(rq->cqe_dma);
        vfree(rq->cqe);
}

/**
 * hinic_init_rq - Initialize HW Receive Queue
 * @rq: HW Receive Queue
 * @hwif: HW Interface for accessing HW
 * @wq: Work Queue for the data of the RQ
 * @entry: msix entry for rq
 *
 * Return 0 - Success, negative - Failure
 **/
int hinic_init_rq(struct hinic_rq *rq, struct hinic_hwif *hwif,
                  struct hinic_wq *wq, struct msix_entry *entry)
{
        struct pci_dev *pdev = hwif->pdev;
        size_t pi_size;
        int err;

        rq->hwif = hwif;

        rq->wq = wq;

        rq->irq = entry->vector;
        rq->msix_entry = entry->entry;

        rq->buf_sz = HINIC_RX_BUF_SZ;

        err = alloc_rq_skb_arr(rq);
        if (err) {
                dev_err(&pdev->dev, "Failed to allocate rq priv data\n");
                return err;
        }

        err = alloc_rq_cqe(rq);
        if (err) {
                dev_err(&pdev->dev, "Failed to allocate rq cqe\n");
                goto err_alloc_rq_cqe;
        }

        /* HW requirements: Must be at least 32 bit */
        pi_size = ALIGN(sizeof(*rq->pi_virt_addr), sizeof(u32));
        rq->pi_virt_addr = dma_zalloc_coherent(&pdev->dev, pi_size,
                                               &rq->pi_dma_addr, GFP_KERNEL);
        if (!rq->pi_virt_addr) {
                dev_err(&pdev->dev, "Failed to allocate PI address\n");
                err = -ENOMEM;
                goto err_pi_virt;
        }

        return 0;

err_pi_virt:
        free_rq_cqe(rq);

err_alloc_rq_cqe:
        free_rq_skb_arr(rq);
        return err;
}

/**
 * hinic_clean_rq - Clean HW Receive Queue's Resources
 * @rq: HW Receive Queue
 **/
void hinic_clean_rq(struct hinic_rq *rq)
{
        struct hinic_hwif *hwif = rq->hwif;
        struct pci_dev *pdev = hwif->pdev;
        size_t pi_size;

        pi_size = ALIGN(sizeof(*rq->pi_virt_addr), sizeof(u32));
        dma_free_coherent(&pdev->dev, pi_size, rq->pi_virt_addr,
                          rq->pi_dma_addr);

        free_rq_cqe(rq);
        free_rq_skb_arr(rq);
}

/**
 * hinic_get_sq_free_wqebbs - return number of free wqebbs for use
 * @sq: send queue
 *
 * Return number of free wqebbs
 **/
int hinic_get_sq_free_wqebbs(struct hinic_sq *sq)
{
        struct hinic_wq *wq = sq->wq;

        return atomic_read(&wq->delta) - 1;
}

/**
 * hinic_get_rq_free_wqebbs - return number of free wqebbs for use
 * @rq: recv queue
 *
 * Return number of free wqebbs
 **/
int hinic_get_rq_free_wqebbs(struct hinic_rq *rq)
{
        struct hinic_wq *wq = rq->wq;

        return atomic_read(&wq->delta) - 1;
}

static void sq_prepare_ctrl(struct hinic_sq_ctrl *ctrl, u16 prod_idx,
                            int nr_descs)
{
        u32 ctrl_size, task_size, bufdesc_size;

        ctrl_size = SIZE_8BYTES(sizeof(struct hinic_sq_ctrl));
        task_size = SIZE_8BYTES(sizeof(struct hinic_sq_task));
        bufdesc_size = nr_descs * sizeof(struct hinic_sq_bufdesc);
        bufdesc_size = SIZE_8BYTES(bufdesc_size);

        ctrl->ctrl_info = HINIC_SQ_CTRL_SET(bufdesc_size, BUFDESC_SECT_LEN) |
                          HINIC_SQ_CTRL_SET(task_size, TASKSECT_LEN)        |
                          HINIC_SQ_CTRL_SET(SQ_NORMAL_WQE, DATA_FORMAT)     |
                          HINIC_SQ_CTRL_SET(ctrl_size, LEN);

        ctrl->queue_info = HINIC_SQ_CTRL_SET(TX_MAX_MSS_DEFAULT,
                                             QUEUE_INFO_MSS);
}

static void sq_prepare_task(struct hinic_sq_task *task)
{
        task->pkt_info0 =
                HINIC_SQ_TASK_INFO0_SET(0, L2HDR_LEN) |
                HINIC_SQ_TASK_INFO0_SET(HINIC_L4_OFF_DISABLE, L4_OFFLOAD) |
                HINIC_SQ_TASK_INFO0_SET(HINIC_OUTER_L3TYPE_UNKNOWN,
                                        INNER_L3TYPE) |
                HINIC_SQ_TASK_INFO0_SET(HINIC_VLAN_OFF_DISABLE,
                                        VLAN_OFFLOAD) |
                HINIC_SQ_TASK_INFO0_SET(HINIC_PKT_NOT_PARSED, PARSE_FLAG);

        task->pkt_info1 =
                HINIC_SQ_TASK_INFO1_SET(HINIC_MEDIA_UNKNOWN, MEDIA_TYPE) |
                HINIC_SQ_TASK_INFO1_SET(0, INNER_L4_LEN) |
                HINIC_SQ_TASK_INFO1_SET(0, INNER_L3_LEN);

        task->pkt_info2 =
                HINIC_SQ_TASK_INFO2_SET(0, TUNNEL_L4_LEN) |
                HINIC_SQ_TASK_INFO2_SET(0, OUTER_L3_LEN)  |
                HINIC_SQ_TASK_INFO2_SET(HINIC_TUNNEL_L4TYPE_UNKNOWN,
                                        TUNNEL_L4TYPE)    |
                HINIC_SQ_TASK_INFO2_SET(HINIC_OUTER_L3TYPE_UNKNOWN,
                                        OUTER_L3TYPE);

        task->ufo_v6_identify = 0;

        task->pkt_info4 = HINIC_SQ_TASK_INFO4_SET(HINIC_L2TYPE_ETH, L2TYPE);

        task->zero_pad = 0;
}

/**
 * hinic_sq_prepare_wqe - prepare wqe before insert to the queue
 * @sq: send queue
 * @prod_idx: pi value
 * @sq_wqe: wqe to prepare
 * @sges: sges for use by the wqe for send for buf addresses
 * @nr_sges: number of sges
 **/
void hinic_sq_prepare_wqe(struct hinic_sq *sq, u16 prod_idx,
                          struct hinic_sq_wqe *sq_wqe, struct hinic_sge *sges,
                          int nr_sges)
{
        int i;

        sq_prepare_ctrl(&sq_wqe->ctrl, prod_idx, nr_sges);

        sq_prepare_task(&sq_wqe->task);

        for (i = 0; i < nr_sges; i++)
                sq_wqe->buf_descs[i].sge = sges[i];
}

/**
 * sq_prepare_db - prepare doorbell to write
 * @sq: send queue
 * @prod_idx: pi value for the doorbell
 * @cos: cos of the doorbell
 *
 * Return db value
 **/
static u32 sq_prepare_db(struct hinic_sq *sq, u16 prod_idx, unsigned int cos)
{
        struct hinic_qp *qp = container_of(sq, struct hinic_qp, sq);
        u8 hi_prod_idx = SQ_DB_PI_HI(SQ_MASKED_IDX(sq, prod_idx));

        /* Data should be written to HW in Big Endian Format */
        return cpu_to_be32(HINIC_SQ_DB_INFO_SET(hi_prod_idx, PI_HI)     |
                           HINIC_SQ_DB_INFO_SET(HINIC_DB_SQ_TYPE, TYPE) |
                           HINIC_SQ_DB_INFO_SET(HINIC_DATA_PATH, PATH)  |
                           HINIC_SQ_DB_INFO_SET(cos, COS)               |
                           HINIC_SQ_DB_INFO_SET(qp->q_id, QID));
}

/**
 * hinic_sq_write_db- write doorbell
 * @sq: send queue
 * @prod_idx: pi value for the doorbell
 * @wqe_size: wqe size
 * @cos: cos of the wqe
 **/
void hinic_sq_write_db(struct hinic_sq *sq, u16 prod_idx, unsigned int wqe_size,
                       unsigned int cos)
{
        struct hinic_wq *wq = sq->wq;

        /* increment prod_idx to the next */
        prod_idx += ALIGN(wqe_size, wq->wqebb_size) / wq->wqebb_size;

        wmb();  /* Write all before the doorbell */

        writel(sq_prepare_db(sq, prod_idx, cos), SQ_DB_ADDR(sq, prod_idx));
}

/**
 * hinic_sq_get_wqe - get wqe ptr in the current pi and update the pi
 * @sq: sq to get wqe from
 * @wqe_size: wqe size
 * @prod_idx: returned pi
 *
 * Return wqe pointer
 **/
struct hinic_sq_wqe *hinic_sq_get_wqe(struct hinic_sq *sq,
                                      unsigned int wqe_size, u16 *prod_idx)
{
        struct hinic_hw_wqe *hw_wqe = hinic_get_wqe(sq->wq, wqe_size,
                                                    prod_idx);

        if (IS_ERR(hw_wqe))
                return NULL;

        return &hw_wqe->sq_wqe;
}

/**
 * hinic_sq_write_wqe - write the wqe to the sq
 * @sq: send queue
 * @prod_idx: pi of the wqe
 * @sq_wqe: the wqe to write
 * @skb: skb to save
 * @wqe_size: the size of the wqe
 **/
void hinic_sq_write_wqe(struct hinic_sq *sq, u16 prod_idx,
                        struct hinic_sq_wqe *sq_wqe,
                        struct sk_buff *skb, unsigned int wqe_size)
{
        struct hinic_hw_wqe *hw_wqe = (struct hinic_hw_wqe *)sq_wqe;

        sq->saved_skb[prod_idx] = skb;

        /* The data in the HW should be in Big Endian Format */
        hinic_cpu_to_be32(sq_wqe, wqe_size);

        hinic_write_wqe(sq->wq, hw_wqe, wqe_size);
}

/**
 * hinic_sq_read_wqe - read wqe ptr in the current ci and update the ci
 * @sq: send queue
 * @skb: return skb that was saved
 * @wqe_size: the size of the wqe
 * @cons_idx: consumer index of the wqe
 *
 * Return wqe in ci position
 **/
struct hinic_sq_wqe *hinic_sq_read_wqe(struct hinic_sq *sq,
                                       struct sk_buff **skb,
                                       unsigned int *wqe_size, u16 *cons_idx)
{
        struct hinic_hw_wqe *hw_wqe;
        struct hinic_sq_wqe *sq_wqe;
        struct hinic_sq_ctrl *ctrl;
        unsigned int buf_sect_len;
        u32 ctrl_info;

        /* read the ctrl section for getting wqe size */
        hw_wqe = hinic_read_wqe(sq->wq, sizeof(*ctrl), cons_idx);
        if (IS_ERR(hw_wqe))
                return NULL;

        sq_wqe = &hw_wqe->sq_wqe;
        ctrl = &sq_wqe->ctrl;
        ctrl_info = be32_to_cpu(ctrl->ctrl_info);
        buf_sect_len = HINIC_SQ_CTRL_GET(ctrl_info, BUFDESC_SECT_LEN);

        *wqe_size = sizeof(*ctrl) + sizeof(sq_wqe->task);
        *wqe_size += SECT_SIZE_FROM_8BYTES(buf_sect_len);

        *skb = sq->saved_skb[*cons_idx];

        /* using the real wqe size to read wqe again */
        hw_wqe = hinic_read_wqe(sq->wq, *wqe_size, cons_idx);

        return &hw_wqe->sq_wqe;
}

/**
 * hinic_sq_put_wqe - release the ci for new wqes
 * @sq: send queue
 * @wqe_size: the size of the wqe
 **/
void hinic_sq_put_wqe(struct hinic_sq *sq, unsigned int wqe_size)
{
        hinic_put_wqe(sq->wq, wqe_size);
}

/**
 * hinic_sq_get_sges - get sges from the wqe
 * @sq_wqe: wqe to get the sges from its buffer addresses
 * @sges: returned sges
 * @nr_sges: number sges to return
 **/
void hinic_sq_get_sges(struct hinic_sq_wqe *sq_wqe, struct hinic_sge *sges,
                       int nr_sges)
{
        int i;

        for (i = 0; i < nr_sges && i < HINIC_MAX_SQ_BUFDESCS; i++) {
                sges[i] = sq_wqe->buf_descs[i].sge;
                hinic_be32_to_cpu(&sges[i], sizeof(sges[i]));
        }
}

/**
 * hinic_rq_get_wqe - get wqe ptr in the current pi and update the pi
 * @rq: rq to get wqe from
 * @wqe_size: wqe size
 * @prod_idx: returned pi
 *
 * Return wqe pointer
 **/
struct hinic_rq_wqe *hinic_rq_get_wqe(struct hinic_rq *rq,
                                      unsigned int wqe_size, u16 *prod_idx)
{
        struct hinic_hw_wqe *hw_wqe = hinic_get_wqe(rq->wq, wqe_size,
                                                    prod_idx);

        if (IS_ERR(hw_wqe))
                return NULL;

        return &hw_wqe->rq_wqe;
}

/**
 * hinic_rq_write_wqe - write the wqe to the rq
 * @rq: recv queue
 * @prod_idx: pi of the wqe
 * @rq_wqe: the wqe to write
 * @skb: skb to save
 **/
void hinic_rq_write_wqe(struct hinic_rq *rq, u16 prod_idx,
                        struct hinic_rq_wqe *rq_wqe, struct sk_buff *skb)
{
        struct hinic_hw_wqe *hw_wqe = (struct hinic_hw_wqe *)rq_wqe;

        rq->saved_skb[prod_idx] = skb;

        /* The data in the HW should be in Big Endian Format */
        hinic_cpu_to_be32(rq_wqe, sizeof(*rq_wqe));

        hinic_write_wqe(rq->wq, hw_wqe, sizeof(*rq_wqe));
}

/**
 * hinic_rq_read_wqe - read wqe ptr in the current ci and update the ci
 * @rq: recv queue
 * @wqe_size: the size of the wqe
 * @skb: return saved skb
 * @cons_idx: consumer index of the wqe
 *
 * Return wqe in ci position
 **/
struct hinic_rq_wqe *hinic_rq_read_wqe(struct hinic_rq *rq,
                                       unsigned int wqe_size,
                                       struct sk_buff **skb, u16 *cons_idx)
{
        struct hinic_hw_wqe *hw_wqe;
        struct hinic_rq_cqe *cqe;
        int rx_done;
        u32 status;

        hw_wqe = hinic_read_wqe(rq->wq, wqe_size, cons_idx);
        if (IS_ERR(hw_wqe))
                return NULL;

        cqe = rq->cqe[*cons_idx];

        status = be32_to_cpu(cqe->status);

        rx_done = HINIC_RQ_CQE_STATUS_GET(status, RXDONE);
        if (!rx_done)
                return NULL;

        *skb = rq->saved_skb[*cons_idx];

        return &hw_wqe->rq_wqe;
}

/**
 * hinic_rq_read_next_wqe - increment ci and read the wqe in ci position
 * @rq: recv queue
 * @wqe_size: the size of the wqe
 * @skb: return saved skb
 * @cons_idx: consumer index in the wq
 *
 * Return wqe in incremented ci position
 **/
struct hinic_rq_wqe *hinic_rq_read_next_wqe(struct hinic_rq *rq,
                                            unsigned int wqe_size,
                                            struct sk_buff **skb,
                                            u16 *cons_idx)
{
        struct hinic_wq *wq = rq->wq;
        struct hinic_hw_wqe *hw_wqe;
        unsigned int num_wqebbs;

        wqe_size = ALIGN(wqe_size, wq->wqebb_size);
        num_wqebbs = wqe_size / wq->wqebb_size;

        *cons_idx = RQ_MASKED_IDX(rq, *cons_idx + num_wqebbs);

        *skb = rq->saved_skb[*cons_idx];

        hw_wqe = hinic_read_wqe_direct(wq, *cons_idx);

        return &hw_wqe->rq_wqe;
}

/**
 * hinic_put_wqe - release the ci for new wqes
 * @rq: recv queue
 * @cons_idx: consumer index of the wqe
 * @wqe_size: the size of the wqe
 **/
void hinic_rq_put_wqe(struct hinic_rq *rq, u16 cons_idx,
                      unsigned int wqe_size)
{
        struct hinic_rq_cqe *cqe = rq->cqe[cons_idx];
        u32 status = be32_to_cpu(cqe->status);

        status = HINIC_RQ_CQE_STATUS_CLEAR(status, RXDONE);

        /* Rx WQE size is 1 WQEBB, no wq shadow*/
        cqe->status = cpu_to_be32(status);

        wmb();          /* clear done flag */

        hinic_put_wqe(rq->wq, wqe_size);
}

/**
 * hinic_rq_get_sge - get sge from the wqe
 * @rq: recv queue
 * @rq_wqe: wqe to get the sge from its buf address
 * @cons_idx: consumer index
 * @sge: returned sge
 **/
void hinic_rq_get_sge(struct hinic_rq *rq, struct hinic_rq_wqe *rq_wqe,
                      u16 cons_idx, struct hinic_sge *sge)
{
        struct hinic_rq_cqe *cqe = rq->cqe[cons_idx];
        u32 len = be32_to_cpu(cqe->len);

        sge->hi_addr = be32_to_cpu(rq_wqe->buf_desc.hi_addr);
        sge->lo_addr = be32_to_cpu(rq_wqe->buf_desc.lo_addr);
        sge->len = HINIC_RQ_CQE_SGE_GET(len, LEN);
}

/**
 * hinic_rq_prepare_wqe - prepare wqe before insert to the queue
 * @rq: recv queue
 * @prod_idx: pi value
 * @rq_wqe: the wqe
 * @sge: sge for use by the wqe for recv buf address
 **/
void hinic_rq_prepare_wqe(struct hinic_rq *rq, u16 prod_idx,
                          struct hinic_rq_wqe *rq_wqe, struct hinic_sge *sge)
{
        struct hinic_rq_cqe_sect *cqe_sect = &rq_wqe->cqe_sect;
        struct hinic_rq_bufdesc *buf_desc = &rq_wqe->buf_desc;
        struct hinic_rq_cqe *cqe = rq->cqe[prod_idx];
        struct hinic_rq_ctrl *ctrl = &rq_wqe->ctrl;
        dma_addr_t cqe_dma = rq->cqe_dma[prod_idx];

        ctrl->ctrl_info =
                HINIC_RQ_CTRL_SET(SIZE_8BYTES(sizeof(*ctrl)), LEN) |
                HINIC_RQ_CTRL_SET(SIZE_8BYTES(sizeof(*cqe_sect)),
                                  COMPLETE_LEN)                    |
                HINIC_RQ_CTRL_SET(SIZE_8BYTES(sizeof(*buf_desc)),
                                  BUFDESC_SECT_LEN)                |
                HINIC_RQ_CTRL_SET(RQ_COMPLETE_SGE, COMPLETE_FORMAT);

        hinic_set_sge(&cqe_sect->sge, cqe_dma, sizeof(*cqe));

        buf_desc->hi_addr = sge->hi_addr;
        buf_desc->lo_addr = sge->lo_addr;
}

/**
 * hinic_rq_update - update pi of the rq
 * @rq: recv queue
 * @prod_idx: pi value
 **/
void hinic_rq_update(struct hinic_rq *rq, u16 prod_idx)
{
        *rq->pi_virt_addr = cpu_to_be16(RQ_MASKED_IDX(rq, prod_idx + 1));
}