drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

/*
 * 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/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <net/busy_poll.h>
#include "en.h"
#include "en_tc.h"
#include "eswitch.h"

static inline bool mlx5e_rx_hw_stamp(struct mlx5e_tstamp *tstamp)
{
	return tstamp->hwtstamp_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.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)
{
	u8 op_own = (cqcc >> cq->wq.log_sz) & 1;
	u32 wq_sz = 1 << cq->wq.log_sz;
	u32 ci = cqcc & cq->wq.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)
{
	u16 wqe_cnt_step;

	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.log_sz);
	cq->title.wqe_counter  = cpu_to_be16(cq->decmprs_wqe_counter);

	wqe_cnt_step =
		rq->wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ ?
		mpwrq_get_cqe_consumed_strides(&cq->title) : 1;
	cq->decmprs_wqe_counter =
		(cq->decmprs_wqe_counter + wqe_cnt_step) & 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;
}

void mlx5e_modify_rx_cqe_compression(struct mlx5e_priv *priv, bool val)
{
	bool was_opened;

	if (!MLX5_CAP_GEN(priv->mdev, cqe_compression))
		return;

	mutex_lock(&priv->state_lock);

	if (priv->params.rx_cqe_compress == val)
		goto unlock;

	was_opened = test_bit(MLX5E_STATE_OPENED, &priv->state);
	if (was_opened)
		mlx5e_close_locked(priv->netdev);

	priv->params.rx_cqe_compress = val;

	if (was_opened)
		mlx5e_open_locked(priv->netdev);

unlock:
	mutex_unlock(&priv->state_lock);
}

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

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;
	}

	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)
{
	struct page *page;

	if (mlx5e_rx_cache_get(rq, dma_info))
		return 0;

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

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

int mlx5e_alloc_rx_wqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
{
	struct mlx5e_dma_info *di = &rq->dma_info[ix];

	if (unlikely(mlx5e_page_alloc_mapped(rq, di)))
		return -ENOMEM;

	wqe->data.addr = cpu_to_be64(di->addr + MLX5_RX_HEADROOM);
	return 0;
}

void mlx5e_dealloc_rx_wqe(struct mlx5e_rq *rq, u16 ix)
{
	struct mlx5e_dma_info *di = &rq->dma_info[ix];

	mlx5e_page_release(rq, di, true);
}

static inline int mlx5e_mpwqe_strides_per_page(struct mlx5e_rq *rq)
{
	return rq->mpwqe_num_strides >> MLX5_MPWRQ_WQE_PAGE_ORDER;
}

static inline void mlx5e_add_skb_frag_mpwqe(struct mlx5e_rq *rq,
					    struct sk_buff *skb,
					    struct mlx5e_mpw_info *wi,
					    u32 page_idx, u32 frag_offset,
					    u32 len)
{
	unsigned int truesize =	ALIGN(len, rq->mpwqe_stride_sz);

	dma_sync_single_for_cpu(rq->pdev,
				wi->umr.dma_info[page_idx].addr + frag_offset,
				len, DMA_FROM_DEVICE);
	wi->skbs_frags[page_idx]++;
	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
			wi->umr.dma_info[page_idx].page, frag_offset,
			len, truesize);
}

static inline void
mlx5e_copy_skb_header_mpwqe(struct device *pdev,
			    struct sk_buff *skb,
			    struct mlx5e_mpw_info *wi,
			    u32 page_idx, u32 offset,
			    u32 headlen)
{
	u16 headlen_pg = min_t(u32, headlen, PAGE_SIZE - offset);
	struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[page_idx];
	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_offset(skb, 0,
				       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);
	}
}

static inline void mlx5e_post_umr_wqe(struct mlx5e_rq *rq, u16 ix)
{
	struct mlx5e_mpw_info *wi = &rq->mpwqe.info[ix];
	struct mlx5e_sq *sq = &rq->channel->icosq;
	struct mlx5_wq_cyc *wq = &sq->wq;
	struct mlx5e_umr_wqe *wqe;
	u8 num_wqebbs = DIV_ROUND_UP(sizeof(*wqe), MLX5_SEND_WQE_BB);
	u16 pi;

	/* 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;
		sq->db.ico_wqe[pi].num_wqebbs = 1;
		mlx5e_send_nop(sq, true);
	}

	wqe = mlx5_wq_cyc_get_wqe(wq, pi);
	memcpy(wqe, &wi->umr.wqe, sizeof(*wqe));
	wqe->ctrl.opmod_idx_opcode =
		cpu_to_be32((sq->pc << MLX5_WQE_CTRL_WQE_INDEX_SHIFT) |
			    MLX5_OPCODE_UMR);

	sq->db.ico_wqe[pi].opcode = MLX5_OPCODE_UMR;
	sq->db.ico_wqe[pi].num_wqebbs = num_wqebbs;
	sq->pc += num_wqebbs;
	mlx5e_tx_notify_hw(sq, &wqe->ctrl, 0);
}

static int mlx5e_alloc_rx_umr_mpwqe(struct mlx5e_rq *rq,
				    struct mlx5e_rx_wqe *wqe,
				    u16 ix)
{
	struct mlx5e_mpw_info *wi = &rq->mpwqe.info[ix];
	u64 dma_offset = (u64)mlx5e_get_wqe_mtt_offset(rq, ix) << PAGE_SHIFT;
	int pg_strides = mlx5e_mpwqe_strides_per_page(rq);
	int err;
	int i;

	for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++) {
		struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[i];

		err = mlx5e_page_alloc_mapped(rq, dma_info);
		if (unlikely(err))
			goto err_unmap;
		wi->umr.mtt[i] = cpu_to_be64(dma_info->addr | MLX5_EN_WR);
		page_ref_add(dma_info->page, pg_strides);
		wi->skbs_frags[i] = 0;
	}

	wi->consumed_strides = 0;
	wqe->data.addr = cpu_to_be64(dma_offset);

	return 0;

err_unmap:
	while (--i >= 0) {
		struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[i];

		page_ref_sub(dma_info->page, pg_strides);
		mlx5e_page_release(rq, dma_info, true);
	}

	return err;
}

void mlx5e_free_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi)
{
	int pg_strides = mlx5e_mpwqe_strides_per_page(rq);
	int i;

	for (i = 0; i < MLX5_MPWRQ_PAGES_PER_WQE; i++) {
		struct mlx5e_dma_info *dma_info = &wi->umr.dma_info[i];

		page_ref_sub(dma_info->page, pg_strides - wi->skbs_frags[i]);
		mlx5e_page_release(rq, dma_info, true);
	}
}

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);

	clear_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state);

	if (unlikely(test_bit(MLX5E_RQ_STATE_FLUSH, &rq->state))) {
		mlx5e_free_rx_mpwqe(rq, &rq->mpwqe.info[wq->head]);
		return;
	}

	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);
}

int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, struct mlx5e_rx_wqe *wqe, u16 ix)
{
	int err;

	err = mlx5e_alloc_rx_umr_mpwqe(rq, wqe, ix);
	if (unlikely(err))
		return err;
	set_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state);
	mlx5e_post_umr_wqe(rq, ix);
	return -EBUSY;
}

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);
}

#define RQ_CANNOT_POST(rq) \
	(test_bit(MLX5E_RQ_STATE_FLUSH, &rq->state) || \
	 test_bit(MLX5E_RQ_STATE_UMR_WQE_IN_PROGRESS, &rq->state))

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

	if (unlikely(RQ_CANNOT_POST(rq)))
		return false;

	while (!mlx5_wq_ll_is_full(wq)) {
		struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(wq, wq->head);
		int err;

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

		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);

	return !mlx5_wq_ll_is_full(wq);
}

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 iphdr	*ipv4;
	struct ipv6hdr	*ipv6;
	struct tcphdr	*tcp;
	int network_depth = 0;
	__be16 proto;
	u16 tot_len;

	u8 l4_hdr_type = get_cqe_l4_hdr_type(cqe);
	int tcp_ack = ((CQE_L4_HDR_TYPE_TCP_ACK_NO_DATA  == l4_hdr_type) ||
		       (CQE_L4_HDR_TYPE_TCP_ACK_AND_DATA == l4_hdr_type));

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

	ipv4 = (struct iphdr *)(skb->data + network_depth);
	ipv6 = (struct ipv6hdr *)(skb->data + network_depth);
	tot_len = cqe_bcnt - network_depth;

	if (proto == htons(ETH_P_IP)) {
		tcp = (struct tcphdr *)(skb->data + network_depth +
					sizeof(struct iphdr));
		ipv6 = NULL;
		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
	} else {
		tcp = (struct tcphdr *)(skb->data + network_depth +
					sizeof(struct ipv6hdr));
		ipv4 = NULL;
		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
	}

	if (get_cqe_lro_tcppsh(cqe))
		tcp->psh                = 1;

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

	if (ipv4) {
		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);
	} else {
		ipv6->hop_limit         = cqe->lro_min_ttl;
		ipv6->payload_len       = cpu_to_be16(tot_len -
						      sizeof(struct ipv6hdr));
	}
}

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_first_ethertype_ip(struct sk_buff *skb)
{
	__be16 ethertype = ((struct ethhdr *)skb->data)->h_proto;

	return (ethertype == htons(ETH_P_IP) || ethertype == htons(ETH_P_IPV6));
}

static inline void mlx5e_handle_csum(struct net_device *netdev,
				     struct mlx5_cqe64 *cqe,
				     struct mlx5e_rq *rq,
				     struct sk_buff *skb,
				     bool   lro)
{
	if (unlikely(!(netdev->features & NETIF_F_RXCSUM)))
		goto csum_none;

	if (lro) {
		skb->ip_summed = CHECKSUM_UNNECESSARY;
		return;
	}

	if (is_first_ethertype_ip(skb)) {
		skb->ip_summed = CHECKSUM_COMPLETE;
		skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
		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;
	}
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;
	struct mlx5e_tstamp *tstamp = rq->tstamp;
	int lro_num_seg;

	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);
		rq->stats.lro_packets++;
		rq->stats.lro_bytes += cqe_bcnt;
	}

	if (unlikely(mlx5e_rx_hw_stamp(tstamp)))
		mlx5e_fill_hwstamp(tstamp, get_cqe_ts(cqe), skb_hwtstamps(skb));

	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));

	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_sq *sq)
{
	struct mlx5_wq_cyc *wq = &sq->wq;
	struct mlx5e_tx_wqe *wqe;
	u16 pi = (sq->pc - MLX5E_XDP_TX_WQEBBS) & wq->sz_m1; /* last pi */

	wqe  = mlx5_wq_cyc_get_wqe(wq, pi);

	wqe->ctrl.fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
	mlx5e_tx_notify_hw(sq, &wqe->ctrl, 0);
}

static inline void mlx5e_xmit_xdp_frame(struct mlx5e_rq *rq,
					struct mlx5e_dma_info *di,
					unsigned int data_offset,
					int len)
{
	struct mlx5e_sq          *sq   = &rq->channel->xdp_sq;
	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 mlx5e_sq_wqe_info *wi   = &sq->db.xdp.wqe_info[pi];

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

	dma_addr_t dma_addr  = di->addr + data_offset + MLX5E_XDP_MIN_INLINE;
	unsigned int dma_len = len - MLX5E_XDP_MIN_INLINE;
	void *data           = page_address(di->page) + data_offset;

	if (unlikely(!mlx5e_sq_has_room_for(sq, MLX5E_XDP_TX_WQEBBS))) {
		if (sq->db.xdp.doorbell) {
			/* SQ is full, ring doorbell */
			mlx5e_xmit_xdp_doorbell(sq);
			sq->db.xdp.doorbell = false;
		}
		rq->stats.xdp_tx_full++;
		mlx5e_page_release(rq, di, true);
		return;
	}

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

	memset(wqe, 0, sizeof(*wqe));

	/* copy the inline part */
	memcpy(eseg->inline_hdr_start, data, MLX5E_XDP_MIN_INLINE);
	eseg->inline_hdr_sz = cpu_to_be16(MLX5E_XDP_MIN_INLINE);

	dseg = (struct mlx5_wqe_data_seg *)cseg + (MLX5E_XDP_TX_DS_COUNT - 1);

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

	cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8) | MLX5_OPCODE_SEND);
	cseg->qpn_ds = cpu_to_be32((sq->sqn << 8) | MLX5E_XDP_TX_DS_COUNT);

	sq->db.xdp.di[pi] = *di;
	wi->opcode     = MLX5_OPCODE_SEND;
	wi->num_wqebbs = MLX5E_XDP_TX_WQEBBS;
	sq->pc += MLX5E_XDP_TX_WQEBBS;

	sq->db.xdp.doorbell = true;
	rq->stats.xdp_tx++;
}

/* returns true if packet was consumed by xdp */
static inline bool mlx5e_xdp_handle(struct mlx5e_rq *rq,
				    const struct bpf_prog *prog,
				    struct mlx5e_dma_info *di,
				    void *data, u16 len)
{
	struct xdp_buff xdp;
	u32 act;

	if (!prog)
		return false;

	xdp.data = data;
	xdp.data_end = xdp.data + len;
	act = bpf_prog_run_xdp(prog, &xdp);
	switch (act) {
	case XDP_PASS:
		return false;
	case XDP_TX:
		mlx5e_xmit_xdp_frame(rq, di, MLX5_RX_HEADROOM, len);
		return true;
	default:
		bpf_warn_invalid_xdp_action(act);
	case XDP_ABORTED:
	case XDP_DROP:
		rq->stats.xdp_drop++;
		mlx5e_page_release(rq, di, true);
		return true;
	}
}

static inline
struct sk_buff *skb_from_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe,
			     u16 wqe_counter, u32 cqe_bcnt)
{
	struct bpf_prog *xdp_prog = READ_ONCE(rq->xdp_prog);
	struct mlx5e_dma_info *di;
	struct sk_buff *skb;
	void *va, *data;

	di             = &rq->dma_info[wqe_counter];
	va             = page_address(di->page);
	data           = va + MLX5_RX_HEADROOM;

	dma_sync_single_range_for_cpu(rq->pdev,
				      di->addr,
				      MLX5_RX_HEADROOM,
				      rq->buff.wqe_sz,
				      DMA_FROM_DEVICE);
	prefetch(data);

	if (unlikely((cqe->op_own >> 4) != MLX5_CQE_RESP_SEND)) {
		rq->stats.wqe_err++;
		mlx5e_page_release(rq, di, true);
		return NULL;
	}

	if (mlx5e_xdp_handle(rq, xdp_prog, di, data, cqe_bcnt))
		return NULL; /* page/packet was consumed by XDP */

	skb = build_skb(va, RQ_PAGE_SIZE(rq));
	if (unlikely(!skb)) {
		rq->stats.buff_alloc_err++;
		mlx5e_page_release(rq, di, true);
		return NULL;
	}

	/* queue up for recycling ..*/
	page_ref_inc(di->page);
	mlx5e_page_release(rq, di, true);

	skb_reserve(skb, MLX5_RX_HEADROOM);
	skb_put(skb, cqe_bcnt);

	return skb;
}

void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
{
	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);
	cqe_bcnt       = be32_to_cpu(cqe->byte_cnt);

	skb = skb_from_cqe(rq, cqe, wqe_counter, cqe_bcnt);
	if (!skb)
		goto wq_ll_pop;

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

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

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 mlx5_eswitch_rep *rep = priv->ppriv;
	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);
	cqe_bcnt       = be32_to_cpu(cqe->byte_cnt);

	skb = skb_from_cqe(rq, cqe, wqe_counter, cqe_bcnt);
	if (!skb)
		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);

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

static inline void mlx5e_mpwqe_fill_rx_skb(struct mlx5e_rq *rq,
					   struct mlx5_cqe64 *cqe,
					   struct mlx5e_mpw_info *wi,
					   u32 cqe_bcnt,
					   struct sk_buff *skb)
{
	u16 stride_ix      = mpwrq_get_cqe_stride_index(cqe);
	u32 wqe_offset     = stride_ix * rq->mpwqe_stride_sz;
	u32 head_offset    = wqe_offset & (PAGE_SIZE - 1);
	u32 page_idx       = wqe_offset >> PAGE_SHIFT;
	u32 head_page_idx  = page_idx;
	u16 headlen = min_t(u16, MLX5_MPWRQ_SMALL_PACKET_THRESHOLD, cqe_bcnt);
	u32 frag_offset    = head_offset + headlen;
	u16 byte_cnt       = cqe_bcnt - headlen;

	if (unlikely(frag_offset >= PAGE_SIZE)) {
		page_idx++;
		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, wi, page_idx, frag_offset,
					 pg_consumed_bytes);
		byte_cnt -= pg_consumed_bytes;
		frag_offset = 0;
		page_idx++;
	}
	/* copy header */
	mlx5e_copy_skb_header_mpwqe(rq->pdev, skb, wi, head_page_idx,
				    head_offset, headlen);
	/* skb linear part was allocated with headlen and aligned to long */
	skb->tail += headlen;
	skb->len  += headlen;
}

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];
	struct mlx5e_rx_wqe  *wqe = mlx5_wq_ll_get_wqe(&rq->wq, wqe_id);
	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;
	}

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

	prefetch(skb->data);
	cqe_bcnt = mpwrq_get_cqe_byte_cnt(cqe);

	mlx5e_mpwqe_fill_rx_skb(rq, cqe, wi, cqe_bcnt, skb);
	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;

	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_sq *xdp_sq = &rq->channel->xdp_sq;
	int work_done = 0;

	if (unlikely(test_bit(MLX5E_RQ_STATE_FLUSH, &rq->state)))
		return 0;

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

	for (; work_done < budget; work_done++) {
		struct mlx5_cqe64 *cqe = mlx5e_get_cqe(cq);

		if (!cqe)
			break;

		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);
	}

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

	mlx5_cqwq_update_db_record(&cq->wq);

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

	return work_done;
}