/*
 * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/prefetch.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/bpf_trace.h>
#include <net/busy_poll.h>
#include <net/ip6_checksum.h>
#include "en.h"
#include "en_tc.h"
#include "eswitch.h"
#include "en_rep.h"
#include "ipoib/ipoib.h"
#include "en_accel/ipsec_rxtx.h"
#include "lib/clock.h"

static inline bool mlx5e_rx_hw_stamp(struct hwtstamp_config *config)
{
        return config->rx_filter == HWTSTAMP_FILTER_ALL;
}

static inline void mlx5e_read_cqe_slot(struct mlx5e_cq *cq, u32 cqcc,
                                       void *data)
{
        u32 ci = cqcc & cq->wq.fbc.sz_m1;

        memcpy(data, mlx5_cqwq_get_wqe(&cq->wq, ci), sizeof(struct mlx5_cqe64));
}

static inline void mlx5e_read_title_slot(struct mlx5e_rq *rq,
                                         struct mlx5e_cq *cq, u32 cqcc)
{
        mlx5e_read_cqe_slot(cq, cqcc, &cq->title);
        cq->decmprs_left        = be32_to_cpu(cq->title.byte_cnt);
        cq->decmprs_wqe_counter = be16_to_cpu(cq->title.wqe_counter);
        rq->stats.cqe_compress_blks++;
}

static inline void mlx5e_read_mini_arr_slot(struct mlx5e_cq *cq, u32 cqcc)
{
        mlx5e_read_cqe_slot(cq, cqcc, cq->mini_arr);
        cq->mini_arr_idx = 0;
}

static inline void mlx5e_cqes_update_owner(struct mlx5e_cq *cq, u32 cqcc, int n)
{
        struct mlx5_frag_buf_ctrl *fbc = &cq->wq.fbc;
        u8 op_own = (cqcc >> fbc->log_sz) & 1;
        u32 wq_sz = 1 << fbc->log_sz;
        u32 ci = cqcc & fbc->sz_m1;
        u32 ci_top = min_t(u32, wq_sz, ci + n);

        for (; ci < ci_top; ci++, n--) {
                struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(&cq->wq, ci);

                cqe->op_own = op_own;
        }

        if (unlikely(ci == wq_sz)) {
                op_own = !op_own;
                for (ci = 0; ci < n; ci++) {
                        struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(&cq->wq, ci);

                        cqe->op_own = op_own;
                }
        }
}

static inline void mlx5e_decompress_cqe(struct mlx5e_rq *rq,
                                        struct mlx5e_cq *cq, u32 cqcc)
{
        cq->title.byte_cnt     = cq->mini_arr[cq->mini_arr_idx].byte_cnt;
        cq->title.check_sum    = cq->mini_arr[cq->mini_arr_idx].checksum;
        cq->title.op_own      &= 0xf0;
        cq->title.op_own      |= 0x01 & (cqcc >> cq->wq.fbc.log_sz);
        cq->title.wqe_counter  = cpu_to_be16(cq->decmprs_wqe_counter);

        if (rq->wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ)
                cq->decmprs_wqe_counter +=
                        mpwrq_get_cqe_consumed_strides(&cq->title);
        else
                cq->decmprs_wqe_counter =
                        (cq->decmprs_wqe_counter + 1) & rq->wq.sz_m1;
}

static inline void mlx5e_decompress_cqe_no_hash(struct mlx5e_rq *rq,
                                                struct mlx5e_cq *cq, u32 cqcc)
{
        mlx5e_decompress_cqe(rq, cq, cqcc);
        cq->title.rss_hash_type   = 0;
        cq->title.rss_hash_result = 0;
}

static inline u32 mlx5e_decompress_cqes_cont(struct mlx5e_rq *rq,
                                             struct mlx5e_cq *cq,
                                             int update_owner_only,
                                             int budget_rem)
{
        u32 cqcc = cq->wq.cc + update_owner_only;
        u32 cqe_count;
        u32 i;

        cqe_count = min_t(u32, cq->decmprs_left, budget_rem);

        for (i = update_owner_only; i < cqe_count;
             i++, cq->mini_arr_idx++, cqcc++) {
                if (cq->mini_arr_idx == MLX5_MINI_CQE_ARRAY_SIZE)
                        mlx5e_read_mini_arr_slot(cq, cqcc);

                mlx5e_decompress_cqe_no_hash(rq, cq, cqcc);
                rq->handle_rx_cqe(rq, &cq->title);
        }
        mlx5e_cqes_update_owner(cq, cq->wq.cc, cqcc - cq->wq.cc);
        cq->wq.cc = cqcc;
        cq->decmprs_left -= cqe_count;
        rq->stats.cqe_compress_pkts += cqe_count;

        return cqe_count;
}

static inline u32 mlx5e_decompress_cqes_start(struct mlx5e_rq *rq,
                                              struct mlx5e_cq *cq,
                                              int budget_rem)
{
        mlx5e_read_title_slot(rq, cq, cq->wq.cc);
        mlx5e_read_mini_arr_slot(cq, cq->wq.cc + 1);
        mlx5e_decompress_cqe(rq, cq, cq->wq.cc);
        rq->handle_rx_cqe(rq, &cq->title);
        cq->mini_arr_idx++;

        return mlx5e_decompress_cqes_cont(rq, cq, 1, budget_rem) - 1;
}

#define RQ_PAGE_SIZE(rq) ((1 << rq->buff.page_order) << PAGE_SHIFT)

static inline bool mlx5e_page_is_reserved(struct page *page)
{
        return page_is_pfmemalloc(page) || page_to_nid(page) != numa_mem_id();
}

static inline bool mlx5e_rx_cache_put(struct mlx5e_rq *rq,
                                      struct mlx5e_dma_info *dma_info)
{
        struct mlx5e_page_cache *cache = &rq->page_cache;
        u32 tail_next = (cache->tail + 1) & (MLX5E_CACHE_SIZE - 1);

        if (tail_next == cache->head) {
                rq->stats.cache_full++;
                return false;
        }

        if (unlikely(mlx5e_page_is_reserved(dma_info->page))) {
                rq->stats.cache_waive++;
                return false;
        }

        cache->page_cache[cache->tail] = *dma_info;
        cache->tail = tail_next;
        return true;
}

static inline bool mlx5e_rx_cache_get(struct mlx5e_rq *rq,
                                      struct mlx5e_dma_info *dma_info)
{
        struct mlx5e_page_cache *cache = &rq->page_cache;

        if (unlikely(cache->head == cache->tail)) {
                rq->stats.cache_empty++;
                return false;
        }

        if (page_ref_count(cache->page_cache[cache->head].page) != 1) {
                rq->stats.cache_busy++;
                return false;
        }

        *dma_info = cache->page_cache[cache->head];
        cache->head = (cache->head + 1) & (MLX5E_CACHE_SIZE - 1);
        rq->stats.cache_reuse++;

        dma_sync_single_for_device(rq->pdev, dma_info->addr,
                                   RQ_PAGE_SIZE(rq),
                                   DMA_FROM_DEVICE);
        return true;
}

static inline int mlx5e_page_alloc_mapped(struct mlx5e_rq *rq,
                                          struct mlx5e_dma_info *dma_info)
{
        if (mlx5e_rx_cache_get(rq, dma_info))
                return 0;

        dma_info->page = dev_alloc_pages(rq->buff.page_order);
        if (unlikely(!dma_info->page))
                return -ENOMEM;

        dma_info->addr = dma_map_page(rq->pdev, dma_info->page, 0,
                                      RQ_PAGE_SIZE(rq), rq->buff.map_dir);
        if (unlikely(dma_mapping_error(rq->pdev, dma_info->addr))) {
                put_page(dma_info->page);
                dma_info->page = NULL;
                return -ENOMEM;
        }

        return 0;
}

void mlx5e_page_release(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info,
                        bool recycle)
{
        if (likely(recycle) && mlx5e_rx_cache_put(rq, dma_info))
                return;

        dma_unmap_page(rq->pdev, dma_info->addr, RQ_PAGE_SIZE(rq),
                       rq->buff.map_dir);
        put_page(dma_info->page);
}

static inline bool mlx5e_page_reuse(struct mlx5e_rq *rq,
                                    struct mlx5e_wqe_frag_info *wi)
{
        return rq->wqe.page_reuse && wi->di.page &&
                (wi->offset + rq->wqe.frag_sz <= RQ_PAGE_SIZE(rq)) &&
                !mlx5e_page_is_reserved(wi->di.page);
}

static int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
{
        struct mlx5e_wqe_frag_info *wi = &rq->wqe.frag_info[ix];

        /* check if page exists, hence can be reused */
        if (!wi->di.page) {
                if (unlikely(mlx5e_page_alloc_mapped(rq, &wi->di)))
                        return -ENOMEM;
                wi->offset = 0;
        }

        wqe->data.addr = cpu_to_be64(wi->di.addr + wi->offset + rq->buff.headroom);
        return 0;
}

static inline void mlx5e_free_rx_wqe(struct mlx5e_rq *rq,
                                     struct mlx5e_wqe_frag_info *wi)
{
        mlx5e_page_release(rq, &wi->di, true);
        wi->di.page = NULL;
}

static inline void mlx5e_free_rx_wqe_reuse(struct mlx5e_rq *rq,
                                           struct mlx5e_wqe_frag_info *wi)
{
        if (mlx5e_page_reuse(rq, wi)) {
                rq->stats.page_reuse++;
                return;
        }

        mlx5e_free_rx_wqe(rq, wi);
}

void mlx5e_dealloc_rx_wqe(struct mlx5e_rq *rq, u16 ix)
{
        struct mlx5e_wqe_frag_info *wi = &rq->wqe.frag_info[ix];

        if (wi->di.page)
                mlx5e_free_rx_wqe(rq, wi);
}

static inline void mlx5e_add_skb_frag_mpwqe(struct mlx5e_rq *rq,
                                            struct sk_buff *skb,
                                            struct mlx5e_dma_info *di,
                                            u32 frag_offset, u32 len)
{
        unsigned int truesize = ALIGN(len, BIT(rq->mpwqe.log_stride_sz));

        dma_sync_single_for_cpu(rq->pdev,
                                di->addr + frag_offset,
                                len, DMA_FROM_DEVICE);
        page_ref_inc(di->page);
        skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
                        di->page, frag_offset, len, truesize);
}

static inline void
mlx5e_copy_skb_header_mpwqe(struct device *pdev,
                            struct sk_buff *skb,
                            struct mlx5e_dma_info *dma_info,
                            u32 offset, u32 headlen)
{
        u16 headlen_pg = min_t(u32, headlen, PAGE_SIZE - offset);
        unsigned int len;

         /* Aligning len to sizeof(long) optimizes memcpy performance */
        len = ALIGN(headlen_pg, sizeof(long));
        dma_sync_single_for_cpu(pdev, dma_info->addr + offset, len,
                                DMA_FROM_DEVICE);
        skb_copy_to_linear_data(skb, page_address(dma_info->page) + offset, len);

        if (unlikely(offset + headlen > PAGE_SIZE)) {
                dma_info++;
                headlen_pg = len;
                len = ALIGN(headlen - headlen_pg, sizeof(long));
                dma_sync_single_for_cpu(pdev, dma_info->addr, len,
                                        DMA_FROM_DEVICE);
                skb_copy_to_linear_data_offset(skb, headlen_pg,
                                               page_address(dma_info->page),
                                               len);
        }
}

void mlx5e_free_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi)
{
        const bool no_xdp_xmit =
                bitmap_empty(wi->xdp_xmit_bitmap, MLX5_MPWRQ_PAGES_PER_WQE);
        struct mlx5e_dma_info *dma_info = wi->umr.dma_info;
        int i;

        for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++)
                if (no_xdp_xmit || !test_bit(i, wi->xdp_xmit_bitmap))
                        mlx5e_page_release(rq, &dma_info[i], true);
}

static void mlx5e_post_rx_mpwqe(struct mlx5e_rq *rq)
{
        struct mlx5_wq_ll *wq = &rq->wq;
        struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);

        rq->mpwqe.umr_in_progress = false;

        mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index));

        /* ensure wqes are visible to device before updating doorbell record */
        dma_wmb();

        mlx5_wq_ll_update_db_record(wq);
}

static inline u16 mlx5e_icosq_wrap_cnt(struct mlx5e_icosq *sq)
{
        return sq->pc >> MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE;
}

static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
{
        struct mlx5e_mpw_info *wi = &rq->mpwqe.info[ix];
        struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[0];
        struct mlx5e_icosq *sq = &rq->channel->icosq;
        struct mlx5_wq_cyc *wq = &sq->wq;
        struct mlx5e_umr_wqe *umr_wqe;
        u16 xlt_offset = ix << (MLX5E_LOG_ALIGNED_MPWQE_PPW - 1);
        int err;
        u16 pi;
        int i;

        /* fill sq edge with nops to avoid wqe wrap around */
        while ((pi = (sq->pc & wq->sz_m1)) > sq->edge) {
                sq->db.ico_wqe[pi].opcode = MLX5_OPCODE_NOP;
                mlx5e_post_nop(wq, sq->sqn, &sq->pc);
        }

        umr_wqe = mlx5_wq_cyc_get_wqe(wq, pi);
        if (unlikely(mlx5e_icosq_wrap_cnt(sq) < 2))
                memcpy(umr_wqe, &rq->mpwqe.umr_wqe,
                       offsetof(struct mlx5e_umr_wqe, inline_mtts));

        for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++, dma_info++) {
                err = mlx5e_page_alloc_mapped(rq, dma_info);
                if (unlikely(err))
                        goto err_unmap;
                umr_wqe->inline_mtts[i].ptag = cpu_to_be64(dma_info->addr | MLX5_EN_WR);
        }

        bitmap_zero(wi->xdp_xmit_bitmap, MLX5_MPWRQ_PAGES_PER_WQE);
        wi->consumed_strides = 0;

        rq->mpwqe.umr_in_progress = true;

        umr_wqe->ctrl.opmod_idx_opcode =
                cpu_to_be32((sq->pc << MLX5_WQE_CTRL_WQE_INDEX_SHIFT) |
                            MLX5_OPCODE_UMR);
        umr_wqe->uctrl.xlt_offset = cpu_to_be16(xlt_offset);

        sq->db.ico_wqe[pi].opcode = MLX5_OPCODE_UMR;
        sq->pc += MLX5E_UMR_WQEBBS;
        mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, &umr_wqe->ctrl);

        return 0;

err_unmap:
        while (--i >= 0) {
                dma_info--;
                mlx5e_page_release(rq, dma_info, true);
        }
        rq->stats.buff_alloc_err++;

        return err;
}

void mlx5e_dealloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
{
        struct mlx5e_mpw_info *wi = &rq->mpwqe.info[ix];

        mlx5e_free_rx_mpwqe(rq, wi);
}

bool mlx5e_post_rx_wqes(struct mlx5e_rq *rq)
{
        struct mlx5_wq_ll *wq = &rq->wq;
        int err;

        if (unlikely(!MLX5E_TEST_BIT(rq->state, MLX5E_RQ_STATE_ENABLED)))
                return false;

        if (mlx5_wq_ll_is_full(wq))
                return false;

        do {
                struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);

                err = mlx5e_alloc_rx_wqe(rq, wqe, wq->head);
                if (unlikely(err)) {
                        rq->stats.buff_alloc_err++;
                        break;
                }

                mlx5_wq_ll_push(wq, be16_to_cpu(wqe->next.next_wqe_index));
        } while (!mlx5_wq_ll_is_full(wq));

        /* ensure wqes are visible to device before updating doorbell record */
        dma_wmb();

        mlx5_wq_ll_update_db_record(wq);

        return !!err;
}

static inline void mlx5e_poll_ico_single_cqe(struct mlx5e_cq *cq,
                                             struct mlx5e_icosq *sq,
                                             struct mlx5e_rq *rq,
                                             struct mlx5_cqe64 *cqe)
{
        struct mlx5_wq_cyc *wq = &sq->wq;
        u16 ci = be16_to_cpu(cqe->wqe_counter) & wq->sz_m1;
        struct mlx5e_sq_wqe_info *icowi = &sq->db.ico_wqe[ci];

        mlx5_cqwq_pop(&cq->wq);

        if (unlikely((cqe->op_own >> 4) != MLX5_CQE_REQ)) {
                netdev_WARN_ONCE(cq->channel->netdev,
                                 "Bad OP in ICOSQ CQE: 0x%x\n", cqe->op_own);
                return;
        }

        if (likely(icowi->opcode == MLX5_OPCODE_UMR)) {
                mlx5e_post_rx_mpwqe(rq);
                return;
        }

        if (unlikely(icowi->opcode != MLX5_OPCODE_NOP))
                netdev_WARN_ONCE(cq->channel->netdev,
                                 "Bad OPCODE in ICOSQ WQE info: 0x%x\n", icowi->opcode);
}

static void mlx5e_poll_ico_cq(struct mlx5e_cq *cq, struct mlx5e_rq *rq)
{
        struct mlx5e_icosq *sq = container_of(cq, struct mlx5e_icosq, cq);
        struct mlx5_cqe64 *cqe;

        if (unlikely(!MLX5E_TEST_BIT(sq->state, MLX5E_SQ_STATE_ENABLED)))
                return;

        cqe = mlx5_cqwq_get_cqe(&cq->wq);
        if (likely(!cqe))
                return;

        /* by design, there's only a single cqe */
        mlx5e_poll_ico_single_cqe(cq, sq, rq, cqe);

        mlx5_cqwq_update_db_record(&cq->wq);
}

bool mlx5e_post_rx_mpwqes(struct mlx5e_rq *rq)
{
        struct mlx5_wq_ll *wq = &rq->wq;

        if (unlikely(!MLX5E_TEST_BIT(rq->state, MLX5E_RQ_STATE_ENABLED)))
                return false;

        mlx5e_poll_ico_cq(&rq->channel->icosq.cq, rq);

        if (mlx5_wq_ll_is_full(wq))
                return false;

        if (!rq->mpwqe.umr_in_progress)
                mlx5e_alloc_rx_mpwqe(rq, wq->head);

        return false;
}

static void mlx5e_lro_update_tcp_hdr(struct mlx5_cqe64 *cqe, struct tcphdr *tcp)
{
        u8 l4_hdr_type = get_cqe_l4_hdr_type(cqe);
        u8 tcp_ack     = (l4_hdr_type == CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA) ||
                         (l4_hdr_type == CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA);

        tcp->check                      = 0;
        tcp->psh                        = get_cqe_lro_tcppsh(cqe);

        if (tcp_ack) {
                tcp->ack                = 1;
                tcp->ack_seq            = cqe->lro_ack_seq_num;
                tcp->window             = cqe->lro_tcp_win;
        }
}

static void mlx5e_lro_update_hdr(struct sk_buff *skb, struct mlx5_cqe64 *cqe,
                                 u32 cqe_bcnt)
{
        struct ethhdr   *eth = (struct ethhdr *)(skb->data);
        struct tcphdr   *tcp;
        int network_depth = 0;
        __wsum check;
        __be16 proto;
        u16 tot_len;
        void *ip_p;

        proto = __vlan_get_protocol(skb, eth->h_proto, &network_depth);

        tot_len = cqe_bcnt - network_depth;
        ip_p = skb->data + network_depth;

        if (proto == htons(ETH_P_IP)) {
                struct iphdr *ipv4 = ip_p;

                tcp = ip_p + sizeof(struct iphdr);
                skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;

                ipv4->ttl               = cqe->lro_min_ttl;
                ipv4->tot_len           = cpu_to_be16(tot_len);
                ipv4->check             = 0;
                ipv4->check             = ip_fast_csum((unsigned char *)ipv4,
                                                       ipv4->ihl);

                mlx5e_lro_update_tcp_hdr(cqe, tcp);
                check = csum_partial(tcp, tcp->doff * 4,
                                     csum_unfold((__force __sum16)cqe->check_sum));
                /* Almost done, don't forget the pseudo header */
                tcp->check = csum_tcpudp_magic(ipv4->saddr, ipv4->daddr,
                                               tot_len - sizeof(struct iphdr),
                                               IPPROTO_TCP, check);
        } else {
                u16 payload_len = tot_len - sizeof(struct ipv6hdr);
                struct ipv6hdr *ipv6 = ip_p;

                tcp = ip_p + sizeof(struct ipv6hdr);
                skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;

                ipv6->hop_limit         = cqe->lro_min_ttl;
                ipv6->payload_len       = cpu_to_be16(payload_len);

                mlx5e_lro_update_tcp_hdr(cqe, tcp);
                check = csum_partial(tcp, tcp->doff * 4,
                                     csum_unfold((__force __sum16)cqe->check_sum));
                /* Almost done, don't forget the pseudo header */
                tcp->check = csum_ipv6_magic(&ipv6->saddr, &ipv6->daddr, payload_len,
                                             IPPROTO_TCP, check);
        }
}

static inline void mlx5e_skb_set_hash(struct mlx5_cqe64 *cqe,
                                      struct sk_buff *skb)
{
        u8 cht = cqe->rss_hash_type;
        int ht = (cht & CQE_RSS_HTYPE_L4) ? PKT_HASH_TYPE_L4 :
                 (cht & CQE_RSS_HTYPE_IP) ? PKT_HASH_TYPE_L3 :
                                            PKT_HASH_TYPE_NONE;
        skb_set_hash(skb, be32_to_cpu(cqe->rss_hash_result), ht);
}

static inline bool is_last_ethertype_ip(struct sk_buff *skb, int *network_depth)
{
        __be16 ethertype = ((struct ethhdr *)skb->data)->h_proto;

        ethertype = __vlan_get_protocol(skb, ethertype, network_depth);
        return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6));
}

static __be32 mlx5e_get_fcs(struct sk_buff *skb)
{
        int last_frag_sz, bytes_in_prev, nr_frags;
        u8 *fcs_p1, *fcs_p2;
        skb_frag_t *last_frag;
        __be32 fcs_bytes;

        if (!skb_is_nonlinear(skb))
                return *(__be32 *)(skb->data + skb->len - ETH_FCS_LEN);

        nr_frags = skb_shinfo(skb)->nr_frags;
        last_frag = &skb_shinfo(skb)->frags[nr_frags - 1];
        last_frag_sz = skb_frag_size(last_frag);

        /* If all FCS data is in last frag */
        if (last_frag_sz >= ETH_FCS_LEN)
                return *(__be32 *)(skb_frag_address(last_frag) +
                                   last_frag_sz - ETH_FCS_LEN);

        fcs_p2 = (u8 *)skb_frag_address(last_frag);
        bytes_in_prev = ETH_FCS_LEN - last_frag_sz;

        /* Find where the other part of the FCS is - Linear or another frag */
        if (nr_frags == 1) {
                fcs_p1 = skb_tail_pointer(skb);
        } else {
                skb_frag_t *prev_frag = &skb_shinfo(skb)->frags[nr_frags - 2];

                fcs_p1 = skb_frag_address(prev_frag) +
                            skb_frag_size(prev_frag);
        }
        fcs_p1 -= bytes_in_prev;

        memcpy(&fcs_bytes, fcs_p1, bytes_in_prev);
        memcpy(((u8 *)&fcs_bytes) + bytes_in_prev, fcs_p2, last_frag_sz);

        return fcs_bytes;
}

static inline void mlx5e_handle_csum(struct net_device *netdev,
                                     struct mlx5_cqe64 *cqe,
                                     struct mlx5e_rq *rq,
                                     struct sk_buff *skb,
                                     bool   lro)
{
        int network_depth = 0;

        if (unlikely(!(netdev->features & NETIF_F_RXCSUM)))
                goto csum_none;

        if (lro) {
                skb->ip_summed = CHECKSUM_UNNECESSARY;
                rq->stats.csum_unnecessary++;
                return;
        }

        if (likely(is_last_ethertype_ip(skb, &network_depth))) {
                skb->ip_summed = CHECKSUM_COMPLETE;
                skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
                if (network_depth > ETH_HLEN)
                        /* CQE csum is calculated from the IP header and does
                         * not cover VLAN headers (if present). This will add
                         * the checksum manually.
                         */
                        skb->csum = csum_partial(skb->data + ETH_HLEN,
                                                 network_depth - ETH_HLEN,
                                                 skb->csum);
                if (unlikely(netdev->features & NETIF_F_RXFCS))
                        skb->csum = csum_add(skb->csum,
                                             (__force __wsum)mlx5e_get_fcs(skb));
                rq->stats.csum_complete++;
                return;
        }

        if (likely((cqe->hds_ip_ext & CQE_L3_OK) &&
                   (cqe->hds_ip_ext & CQE_L4_OK))) {
                skb->ip_summed = CHECKSUM_UNNECESSARY;
                if (cqe_is_tunneled(cqe)) {
                        skb->csum_level = 1;
                        skb->encapsulation = 1;
                        rq->stats.csum_unnecessary_inner++;
                        return;
                }
                rq->stats.csum_unnecessary++;
                return;
        }
csum_none:
        skb->ip_summed = CHECKSUM_NONE;
        rq->stats.csum_none++;
}

static inline void mlx5e_build_rx_skb(struct mlx5_cqe64 *cqe,
                                      u32 cqe_bcnt,
                                      struct mlx5e_rq *rq,
                                      struct sk_buff *skb)
{
        struct net_device *netdev = rq->netdev;
        int lro_num_seg;

        skb->mac_len = ETH_HLEN;
        lro_num_seg = be32_to_cpu(cqe->srqn) >> 24;
        if (lro_num_seg > 1) {
                mlx5e_lro_update_hdr(skb, cqe, cqe_bcnt);
                skb_shinfo(skb)->gso_size = DIV_ROUND_UP(cqe_bcnt, lro_num_seg);
                /* Subtract one since we already counted this as one
                 * "regular" packet in mlx5e_complete_rx_cqe()
                 */
                rq->stats.packets += lro_num_seg - 1;
                rq->stats.lro_packets++;
                rq->stats.lro_bytes += cqe_bcnt;
        }

        if (unlikely(mlx5e_rx_hw_stamp(rq->tstamp)))
                skb_hwtstamps(skb)->hwtstamp =
                                mlx5_timecounter_cyc2time(rq->clock, get_cqe_ts(cqe));

        skb_record_rx_queue(skb, rq->ix);

        if (likely(netdev->features & NETIF_F_RXHASH))
                mlx5e_skb_set_hash(cqe, skb);

        if (cqe_has_vlan(cqe)) {
                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                       be16_to_cpu(cqe->vlan_info));
                rq->stats.removed_vlan_packets++;
        }

        skb->mark = be32_to_cpu(cqe->sop_drop_qpn) & MLX5E_TC_FLOW_ID_MASK;

        mlx5e_handle_csum(netdev, cqe, rq, skb, !!lro_num_seg);
        skb->protocol = eth_type_trans(skb, netdev);
}

static inline void mlx5e_complete_rx_cqe(struct mlx5e_rq *rq,
                                         struct mlx5_cqe64 *cqe,
                                         u32 cqe_bcnt,
                                         struct sk_buff *skb)
{
        rq->stats.packets++;
        rq->stats.bytes += cqe_bcnt;
        mlx5e_build_rx_skb(cqe, cqe_bcnt, rq, skb);
}

static inline void mlx5e_xmit_xdp_doorbell(struct mlx5e_xdpsq *sq)
{
        struct mlx5_wq_cyc *wq = &sq->wq;
        struct mlx5e_tx_wqe *wqe;
        u16 pi = (sq->pc - 1) & wq->sz_m1; /* last pi */

        wqe  = mlx5_wq_cyc_get_wqe(wq, pi);

        mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &wqe->ctrl);
}

static inline bool mlx5e_xmit_xdp_frame(struct mlx5e_rq *rq,
                                        struct mlx5e_dma_info *di,
                                        const struct xdp_buff *xdp)
{
        struct mlx5e_xdpsq       *sq   = &rq->xdpsq;
        struct mlx5_wq_cyc       *wq   = &sq->wq;
        u16                       pi   = sq->pc & wq->sz_m1;
        struct mlx5e_tx_wqe      *wqe  = mlx5_wq_cyc_get_wqe(wq, pi);

        struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
        struct mlx5_wqe_eth_seg  *eseg = &wqe->eth;
        struct mlx5_wqe_data_seg *dseg;

        ptrdiff_t data_offset = xdp->data - xdp->data_hard_start;
        dma_addr_t dma_addr  = di->addr + data_offset;
        unsigned int dma_len = xdp->data_end - xdp->data;

        prefetchw(wqe);

        if (unlikely(dma_len < MLX5E_XDP_MIN_INLINE || rq->hw_mtu < dma_len)) {
                rq->stats.xdp_drop++;
                return false;
        }

        if (unlikely(!mlx5e_wqc_has_room_for(wq, sq->cc, sq->pc, 1))) {
                if (sq->db.doorbell) {
                        /* SQ is full, ring doorbell */
                        mlx5e_xmit_xdp_doorbell(sq);
                        sq->db.doorbell = false;
                }
                rq->stats.xdp_tx_full++;
                return false;
        }

        dma_sync_single_for_device(sq->pdev, dma_addr, dma_len, PCI_DMA_TODEVICE);

        cseg->fm_ce_se = 0;

        dseg = (struct mlx5_wqe_data_seg *)eseg + 1;

        /* copy the inline part if required */
        if (sq->min_inline_mode != MLX5_INLINE_MODE_NONE) {
                memcpy(eseg->inline_hdr.start, xdp->data, MLX5E_XDP_MIN_INLINE);
                eseg->inline_hdr.sz = cpu_to_be16(MLX5E_XDP_MIN_INLINE);
                dma_len  -= MLX5E_XDP_MIN_INLINE;
                dma_addr += MLX5E_XDP_MIN_INLINE;
                dseg++;
        }

        /* write the dma part */
        dseg->addr       = cpu_to_be64(dma_addr);
        dseg->byte_count = cpu_to_be32(dma_len);

        cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_SEND);

        /* move page to reference to sq responsibility,
         * and mark so it's not put back in page-cache.
         */
        __set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */
        sq->db.di[pi] = *di;
        sq->pc++;

        sq->db.doorbell = true;

        rq->stats.xdp_tx++;
        return true;
}

/* returns true if packet was consumed by xdp */
static inline int mlx5e_xdp_handle(struct mlx5e_rq *rq,
                                   struct mlx5e_dma_info *di,
                                   void *va, u16 *rx_headroom, u32 *len)
{
        const struct bpf_prog *prog = READ_ONCE(rq->xdp_prog);
        struct xdp_buff xdp;
        u32 act;

        if (!prog)
                return false;

        xdp.data = va + *rx_headroom;
        xdp_set_data_meta_invalid(&xdp);
        xdp.data_end = xdp.data + *len;
        xdp.data_hard_start = va;
        xdp.rxq = &rq->xdp_rxq;

        act = bpf_prog_run_xdp(prog, &xdp);
        switch (act) {
        case XDP_PASS:
                *rx_headroom = xdp.data - xdp.data_hard_start;
                *len = xdp.data_end - xdp.data;
                return false;
        case XDP_TX:
                if (unlikely(!mlx5e_xmit_xdp_frame(rq, di, &xdp)))
                        trace_xdp_exception(rq->netdev, prog, act);
                return true;
        default:
                bpf_warn_invalid_xdp_action(act);
        case XDP_ABORTED:
                trace_xdp_exception(rq->netdev, prog, act);
        case XDP_DROP:
                rq->stats.xdp_drop++;
                return true;
        }
}

static inline
struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
                                       u32 frag_size, u16 headroom,
                                       u32 cqe_bcnt)
{
        struct sk_buff *skb = build_skb(va, frag_size);

        if (unlikely(!skb)) {
                rq->stats.buff_alloc_err++;
                return NULL;
        }

        skb_reserve(skb, headroom);
        skb_put(skb, cqe_bcnt);

        return skb;
}

static inline
struct sk_buff *skb_from_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe,
                             struct mlx5e_wqe_frag_info *wi, u32 cqe_bcnt)
{
        struct mlx5e_dma_info *di = &wi->di;
        u16 rx_headroom = rq->buff.headroom;
        struct sk_buff *skb;
        void *va, *data;
        bool consumed;
        u32 frag_size;

        va             = page_address(di->page) + wi->offset;
        data           = va + rx_headroom;
        frag_size      = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt);

        dma_sync_single_range_for_cpu(rq->pdev, di->addr, wi->offset,
                                      frag_size, DMA_FROM_DEVICE);
        prefetch(data);
        wi->offset += frag_size;

        if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
                rq->stats.wqe_err++;
                return NULL;
        }

        rcu_read_lock();
        consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt);
        rcu_read_unlock();
        if (consumed)
                return NULL; /* page/packet was consumed by XDP */

        skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt);
        if (unlikely(!skb))
                return NULL;

        /* queue up for recycling/reuse */
        page_ref_inc(di->page);

        return skb;
}

void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
{
        struct mlx5e_wqe_frag_info *wi;
        struct mlx5e_rx_wqe *wqe;
        __be16 wqe_counter_be;
        struct sk_buff *skb;
        u16 wqe_counter;
        u32 cqe_bcnt;

        wqe_counter_be = cqe->wqe_counter;
        wqe_counter    = be16_to_cpu(wqe_counter_be);
        wqe            = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
        wi             = &rq->wqe.frag_info[wqe_counter];
        cqe_bcnt       = be32_to_cpu(cqe->byte_cnt);

        skb = skb_from_cqe(rq, cqe, wi, cqe_bcnt);
        if (!skb) {
                /* probably for XDP */
                if (__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags)) {
                        wi->di.page = NULL;
                        /* do not return page to cache, it will be returned on XDP_TX completion */
                        goto wq_ll_pop;
                }
                /* probably an XDP_DROP, save the page-reuse checks */
                mlx5e_free_rx_wqe(rq, wi);
                goto wq_ll_pop;
        }

        mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
        napi_gro_receive(rq->cq.napi, skb);

        mlx5e_free_rx_wqe_reuse(rq, wi);
wq_ll_pop:
        mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
                       &wqe->next.next_wqe_index);
}

#ifdef CONFIG_MLX5_ESWITCH
void mlx5e_handle_rx_cqe_rep(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
{
        struct net_device *netdev = rq->netdev;
        struct mlx5e_priv *priv = netdev_priv(netdev);
        struct mlx5e_rep_priv *rpriv  = priv->ppriv;
        struct mlx5_eswitch_rep *rep = rpriv->rep;
        struct mlx5e_wqe_frag_info *wi;
        struct mlx5e_rx_wqe *wqe;
        struct sk_buff *skb;
        __be16 wqe_counter_be;
        u16 wqe_counter;
        u32 cqe_bcnt;

        wqe_counter_be = cqe->wqe_counter;
        wqe_counter    = be16_to_cpu(wqe_counter_be);
        wqe            = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
        wi             = &rq->wqe.frag_info[wqe_counter];
        cqe_bcnt       = be32_to_cpu(cqe->byte_cnt);

        skb = skb_from_cqe(rq, cqe, wi, cqe_bcnt);
        if (!skb) {
                if (__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags)) {
                        wi->di.page = NULL;
                        /* do not return page to cache, it will be returned on XDP_TX completion */
                        goto wq_ll_pop;
                }

                /* probably an XDP_DROP, save the page-reuse checks */
                mlx5e_free_rx_wqe(rq, wi);
                goto wq_ll_pop;
        }

        mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);

        if (rep->vlan && skb_vlan_tag_present(skb))
                skb_vlan_pop(skb);

        napi_gro_receive(rq->cq.napi, skb);

        mlx5e_free_rx_wqe_reuse(rq, wi);
wq_ll_pop:
        mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
                       &wqe->next.next_wqe_index);
}
#endif

struct sk_buff *
mlx5e_skb_from_cqe_mpwrq_nonlinear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
                                   u16 cqe_bcnt, u32 head_offset, u32 page_idx)
{
        u16 headlen = min_t(u16, MLX5_MPWRQ_SMALL_PACKET_THRESHOLD, cqe_bcnt);
        struct mlx5e_dma_info *di = &wi->umr.dma_info[page_idx];
        u32 frag_offset    = head_offset + headlen;
        u32 byte_cnt       = cqe_bcnt - headlen;
        struct mlx5e_dma_info *head_di = di;
        struct sk_buff *skb;

        skb = napi_alloc_skb(rq->cq.napi,
                             ALIGN(MLX5_MPWRQ_SMALL_PACKET_THRESHOLD, sizeof(long)));
        if (unlikely(!skb)) {
                rq->stats.buff_alloc_err++;
                return NULL;
        }

        prefetchw(skb->data);

        if (unlikely(frag_offset >= PAGE_SIZE)) {
                di++;
                frag_offset -= PAGE_SIZE;
        }

        while (byte_cnt) {
                u32 pg_consumed_bytes =
                        min_t(u32, PAGE_SIZE - frag_offset, byte_cnt);

                mlx5e_add_skb_frag_mpwqe(rq, skb, di, frag_offset,
                                         pg_consumed_bytes);
                byte_cnt -= pg_consumed_bytes;
                frag_offset = 0;
                di++;
        }
        /* copy header */
        mlx5e_copy_skb_header_mpwqe(rq->pdev, skb, head_di,
                                    head_offset, headlen);
        /* skb linear part was allocated with headlen and aligned to long */
        skb->tail += headlen;
        skb->len  += headlen;

        return skb;
}

struct sk_buff *
mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
                                u16 cqe_bcnt, u32 head_offset, u32 page_idx)
{
        struct mlx5e_dma_info *di = &wi->umr.dma_info[page_idx];
        u16 rx_headroom = rq->buff.headroom;
        u32 cqe_bcnt32 = cqe_bcnt;
        struct sk_buff *skb;
        void *va, *data;
        u32 frag_size;
        bool consumed;

        va             = page_address(di->page) + head_offset;
        data           = va + rx_headroom;
        frag_size      = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt32);

        dma_sync_single_range_for_cpu(rq->pdev, di->addr, head_offset,
                                      frag_size, DMA_FROM_DEVICE);
        prefetch(data);

        rcu_read_lock();
        consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt32);
        rcu_read_unlock();
        if (consumed) {
                if (__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags))
                        __set_bit(page_idx, wi->xdp_xmit_bitmap); /* non-atomic */
                return NULL; /* page/packet was consumed by XDP */
        }

        skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt32);
        if (unlikely(!skb))
                return NULL;

        /* queue up for recycling/reuse */
        page_ref_inc(di->page);

        return skb;
}

void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
{
        u16 cstrides       = mpwrq_get_cqe_consumed_strides(cqe);
        u16 wqe_id         = be16_to_cpu(cqe->wqe_id);
        struct mlx5e_mpw_info *wi = &rq->mpwqe.info[wqe_id];
        u16 stride_ix      = mpwrq_get_cqe_stride_index(cqe);
        u32 wqe_offset     = stride_ix << rq->mpwqe.log_stride_sz;
        u32 head_offset    = wqe_offset & (PAGE_SIZE - 1);
        u32 page_idx       = wqe_offset >> PAGE_SHIFT;
        struct mlx5e_rx_wqe *wqe;
        struct sk_buff *skb;
        u16 cqe_bcnt;

        wi->consumed_strides += cstrides;

        if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
                rq->stats.wqe_err++;
                goto mpwrq_cqe_out;
        }

        if (unlikely(mpwrq_is_filler_cqe(cqe))) {
                rq->stats.mpwqe_filler++;
                goto mpwrq_cqe_out;
        }

        cqe_bcnt = mpwrq_get_cqe_byte_cnt(cqe);

        skb = rq->mpwqe.skb_from_cqe_mpwrq(rq, wi, cqe_bcnt, head_offset,
                                           page_idx);
        if (!skb)
                goto mpwrq_cqe_out;

        mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
        napi_gro_receive(rq->cq.napi, skb);

mpwrq_cqe_out:
        if (likely(wi->consumed_strides < rq->mpwqe.num_strides))
                return;

        wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_id);
        mlx5e_free_rx_mpwqe(rq, wi);
        mlx5_wq_ll_pop(&rq->wq, cqe->wqe_id, &wqe->next.next_wqe_index);
}

int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget)
{
        struct mlx5e_rq *rq = container_of(cq, struct mlx5e_rq, cq);
        struct mlx5e_xdpsq *xdpsq;
        struct mlx5_cqe64 *cqe;
        int work_done = 0;

        if (unlikely(!MLX5E_TEST_BIT(rq->state, MLX5E_RQ_STATE_ENABLED)))
                return 0;

        if (cq->decmprs_left)
                work_done += mlx5e_decompress_cqes_cont(rq, cq, 0, budget);

        cqe = mlx5_cqwq_get_cqe(&cq->wq);
        if (!cqe)
                return 0;

        xdpsq = &rq->xdpsq;

        do {
                if (mlx5_get_cqe_format(cqe) == MLX5_COMPRESSED) {
                        work_done +=
                                mlx5e_decompress_cqes_start(rq, cq,
                                                            budget - work_done);
                        continue;
                }

                mlx5_cqwq_pop(&cq->wq);

                rq->handle_rx_cqe(rq, cqe);
        } while ((++work_done < budget) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));

        if (xdpsq->db.doorbell) {
                mlx5e_xmit_xdp_doorbell(xdpsq);
                xdpsq->db.doorbell = false;
        }

        mlx5_cqwq_update_db_record(&cq->wq);

        /* ensure cq space is freed before enabling more cqes */
        wmb();

        return work_done;
}

bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
{
        struct mlx5e_xdpsq *sq;
        struct mlx5_cqe64 *cqe;
        struct mlx5e_rq *rq;
        u16 sqcc;
        int i;

        sq = container_of(cq, struct mlx5e_xdpsq, cq);

        if (unlikely(!MLX5E_TEST_BIT(sq->state, MLX5E_SQ_STATE_ENABLED)))
                return false;

        cqe = mlx5_cqwq_get_cqe(&cq->wq);
        if (!cqe)
                return false;

        rq = container_of(sq, struct mlx5e_rq, xdpsq);

        /* sq->cc must be updated only after mlx5_cqwq_update_db_record(),
         * otherwise a cq overrun may occur
         */
        sqcc = sq->cc;

        i = 0;
        do {
                u16 wqe_counter;
                bool last_wqe;

                mlx5_cqwq_pop(&cq->wq);

                wqe_counter = be16_to_cpu(cqe->wqe_counter);

                do {
                        struct mlx5e_dma_info *di;
                        u16 ci;

                        last_wqe = (sqcc == wqe_counter);

                        ci = sqcc & sq->wq.sz_m1;
                        di = &sq->db.di[ci];

                        sqcc++;
                        /* Recycle RX page */
                        mlx5e_page_release(rq, di, true);
                } while (!last_wqe);
        } while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));

        mlx5_cqwq_update_db_record(&cq->wq);

        /* ensure cq space is freed before enabling more cqes */
        wmb();

        sq->cc = sqcc;
        return (i == MLX5E_TX_CQ_POLL_BUDGET);
}

void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
{
        struct mlx5e_rq *rq = container_of(sq, struct mlx5e_rq, xdpsq);
        struct mlx5e_dma_info *di;
        u16 ci;

        while (sq->cc != sq->pc) {
                ci = sq->cc & sq->wq.sz_m1;
                di = &sq->db.di[ci];
                sq->cc++;

                mlx5e_page_release(rq, di, false);
        }
}

#ifdef CONFIG_MLX5_CORE_IPOIB

#define MLX5_IB_GRH_DGID_OFFSET 24
#define MLX5_GID_SIZE           16

static inline void mlx5i_complete_rx_cqe(struct mlx5e_rq *rq,
                                         struct mlx5_cqe64 *cqe,
                                         u32 cqe_bcnt,
                                         struct sk_buff *skb)
{
        struct hwtstamp_config *tstamp;
        struct net_device *netdev;
        struct mlx5e_priv *priv;
        char *pseudo_header;
        u32 qpn;
        u8 *dgid;
        u8 g;

        qpn = be32_to_cpu(cqe->sop_drop_qpn) & 0xffffff;
        netdev = mlx5i_pkey_get_netdev(rq->netdev, qpn);

        /* No mapping present, cannot process SKB. This might happen if a child
         * interface is going down while having unprocessed CQEs on parent RQ
         */
        if (unlikely(!netdev)) {
                /* TODO: add drop counters support */
                skb->dev = NULL;
                pr_warn_once("Unable to map QPN %u to dev - dropping skb\n", qpn);
                return;
        }

        priv = mlx5i_epriv(netdev);
        tstamp = &priv->tstamp;

        g = (be32_to_cpu(cqe->flags_rqpn) >> 28) & 3;
        dgid = skb->data + MLX5_IB_GRH_DGID_OFFSET;
        if ((!g) || dgid[0] != 0xff)
                skb->pkt_type = PACKET_HOST;
        else if (memcmp(dgid, netdev->broadcast + 4, MLX5_GID_SIZE) == 0)
                skb->pkt_type = PACKET_BROADCAST;
        else
                skb->pkt_type = PACKET_MULTICAST;

        /* TODO: IB/ipoib: Allow mcast packets from other VFs
         * 68996a6e760e5c74654723eeb57bf65628ae87f4
         */

        skb_pull(skb, MLX5_IB_GRH_BYTES);

        skb->protocol = *((__be16 *)(skb->data));

        skb->ip_summed = CHECKSUM_COMPLETE;
        skb->csum = csum_unfold((__force __sum16)cqe->check_sum);

        if (unlikely(mlx5e_rx_hw_stamp(tstamp)))
                skb_hwtstamps(skb)->hwtstamp =
                                mlx5_timecounter_cyc2time(rq->clock, get_cqe_ts(cqe));

        skb_record_rx_queue(skb, rq->ix);

        if (likely(netdev->features & NETIF_F_RXHASH))
                mlx5e_skb_set_hash(cqe, skb);

        /* 20 bytes of ipoib header and 4 for encap existing */
        pseudo_header = skb_push(skb, MLX5_IPOIB_PSEUDO_LEN);
        memset(pseudo_header, 0, MLX5_IPOIB_PSEUDO_LEN);
        skb_reset_mac_header(skb);
        skb_pull(skb, MLX5_IPOIB_HARD_LEN);

        skb->dev = netdev;

        rq->stats.csum_complete++;
        rq->stats.packets++;
        rq->stats.bytes += cqe_bcnt;
}

void mlx5i_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
{
        struct mlx5e_wqe_frag_info *wi;
        struct mlx5e_rx_wqe *wqe;
        __be16 wqe_counter_be;
        struct sk_buff *skb;
        u16 wqe_counter;
        u32 cqe_bcnt;

        wqe_counter_be = cqe->wqe_counter;
        wqe_counter    = be16_to_cpu(wqe_counter_be);
        wqe            = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
        wi             = &rq->wqe.frag_info[wqe_counter];
        cqe_bcnt       = be32_to_cpu(cqe->byte_cnt);

        skb = skb_from_cqe(rq, cqe, wi, cqe_bcnt);
        if (!skb)
                goto wq_free_wqe;

        mlx5i_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
        if (unlikely(!skb->dev)) {
                dev_kfree_skb_any(skb);
                goto wq_free_wqe;
        }
        napi_gro_receive(rq->cq.napi, skb);

wq_free_wqe:
        mlx5e_free_rx_wqe_reuse(rq, wi);
        mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
                       &wqe->next.next_wqe_index);
}

#endif /* CONFIG_MLX5_CORE_IPOIB */

#ifdef CONFIG_MLX5_EN_IPSEC

void mlx5e_ipsec_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
{
        struct mlx5e_wqe_frag_info *wi;
        struct mlx5e_rx_wqe *wqe;
        __be16 wqe_counter_be;
        struct sk_buff *skb;
        u16 wqe_counter;
        u32 cqe_bcnt;

        wqe_counter_be = cqe->wqe_counter;
        wqe_counter    = be16_to_cpu(wqe_counter_be);
        wqe            = mlx5_wq_ll_get_wqe(&rq->wq, wqe_counter);
        wi             = &rq->wqe.frag_info[wqe_counter];
        cqe_bcnt       = be32_to_cpu(cqe->byte_cnt);

        skb = skb_from_cqe(rq, cqe, wi, cqe_bcnt);
        if (unlikely(!skb)) {
                /* a DROP, save the page-reuse checks */
                mlx5e_free_rx_wqe(rq, wi);
                goto wq_ll_pop;
        }
        skb = mlx5e_ipsec_handle_rx_skb(rq->netdev, skb);
        if (unlikely(!skb)) {
                mlx5e_free_rx_wqe(rq, wi);
                goto wq_ll_pop;
        }

        mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
        napi_gro_receive(rq->cq.napi, skb);

        mlx5e_free_rx_wqe_reuse(rq, wi);
wq_ll_pop:
        mlx5_wq_ll_pop(&rq->wq, wqe_counter_be,
                       &wqe->next.next_wqe_index);
}

#endif /* CONFIG_MLX5_EN_IPSEC */