netdev - [PATCH net-next 12/15] net/mlx5e: RX, Take shared info fragment addition into a function

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Message-ID: <20230417121903.46218-13-tariqt@nvidia.com>
Date:   Mon, 17 Apr 2023 15:19:00 +0300
From:   Tariq Toukan <tariqt@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Hoiland-Jorgensen <toke@...hat.com>,
        <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Gal Pressman <gal@...dia.com>,
        Henning Fehrmann <henning.fehrmann@....mpg.de>,
        "Oliver Behnke" <oliver.behnke@....mpg.de>,
        Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next 12/15] net/mlx5e: RX, Take shared info fragment addition into a function

Introduce mlx5e_add_skb_shared_info_frag(), a function dedicated for
adding a fragment into a struct skb_shared_info object.

Use it in the Legacy RQ flow. Similar usage will be added in a
downstream patch by the corresponding Striding RQ flow.

Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_rx.c   | 56 ++++++++++---------
 1 file changed, 31 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 1049805571c6..1118327f6467 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -471,6 +471,35 @@ static int mlx5e_refill_rx_wqes(struct mlx5e_rq *rq, u16 ix, int wqe_bulk)
 	return i;
 }
 
+static void
+mlx5e_add_skb_shared_info_frag(struct mlx5e_rq *rq, struct skb_shared_info *sinfo,
+			       struct xdp_buff *xdp, struct mlx5e_frag_page *frag_page,
+			       u32 frag_offset, u32 len)
+{
+	skb_frag_t *frag;
+
+	dma_addr_t addr = page_pool_get_dma_addr(frag_page->page);
+
+	dma_sync_single_for_cpu(rq->pdev, addr + frag_offset, len, rq->buff.map_dir);
+	if (!xdp_buff_has_frags(xdp)) {
+		/* Init on the first fragment to avoid cold cache access
+		 * when possible.
+		 */
+		sinfo->nr_frags = 0;
+		sinfo->xdp_frags_size = 0;
+		xdp_buff_set_frags_flag(xdp);
+	}
+
+	frag = &sinfo->frags[sinfo->nr_frags++];
+	__skb_frag_set_page(frag, frag_page->page);
+	skb_frag_off_set(frag, frag_offset);
+	skb_frag_size_set(frag, len);
+
+	if (page_is_pfmemalloc(frag_page->page))
+		xdp_buff_set_frag_pfmemalloc(xdp);
+	sinfo->xdp_frags_size += len;
+}
+
 static inline void
 mlx5e_add_skb_frag(struct mlx5e_rq *rq, struct sk_buff *skb,
 		   struct page *page, u32 frag_offset, u32 len,
@@ -1694,35 +1723,12 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
 	wi++;
 
 	while (cqe_bcnt) {
-		skb_frag_t *frag;
-
 		frag_page = wi->frag_page;
 
 		frag_consumed_bytes = min_t(u32, frag_info->frag_size, cqe_bcnt);
 
-		addr = page_pool_get_dma_addr(frag_page->page);
-		dma_sync_single_for_cpu(rq->pdev, addr + wi->offset,
-					frag_consumed_bytes, rq->buff.map_dir);
-
-		if (!xdp_buff_has_frags(&mxbuf.xdp)) {
-			/* Init on the first fragment to avoid cold cache access
-			 * when possible.
-			 */
-			sinfo->nr_frags = 0;
-			sinfo->xdp_frags_size = 0;
-			xdp_buff_set_frags_flag(&mxbuf.xdp);
-		}
-
-		frag = &sinfo->frags[sinfo->nr_frags++];
-
-		__skb_frag_set_page(frag, frag_page->page);
-		skb_frag_off_set(frag, wi->offset);
-		skb_frag_size_set(frag, frag_consumed_bytes);
-
-		if (page_is_pfmemalloc(frag_page->page))
-			xdp_buff_set_frag_pfmemalloc(&mxbuf.xdp);
-
-		sinfo->xdp_frags_size += frag_consumed_bytes;
+		mlx5e_add_skb_shared_info_frag(rq, sinfo, &mxbuf.xdp, frag_page,
+					       wi->offset, frag_consumed_bytes);
 		truesize += frag_info->frag_stride;
 
 		cqe_bcnt -= frag_consumed_bytes;
-- 
2.34.1