netdev - [RFC/PATCH 13/18] ravb: Add rx_ring_free function support for GbEthernet

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Message-Id: <20210923140813.13541-14-biju.das.jz@bp.renesas.com>
Date:   Thu, 23 Sep 2021 15:08:08 +0100
From:   Biju Das <biju.das.jz@...renesas.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Andrew Lunn <andrew@...n.ch>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Adam Ford <aford173@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: [RFC/PATCH 13/18] ravb: Add rx_ring_free function support for GbEthernet

This patch adds rx_ring_free function support for GbEthernet
found on RZ/G2L SoC.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 2c375002ebcb..038af36141bb 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -236,7 +236,27 @@ static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only)
 
 static void ravb_rx_ring_free_rgeth(struct net_device *ndev, int q)
 {
-	/* Place holder */
+	struct ravb_private *priv = netdev_priv(ndev);
+	unsigned int ring_size;
+	unsigned int i;
+
+	if (!priv->rgeth_rx_ring[q])
+		return;
+
+	for (i = 0; i < priv->num_rx_ring[q]; i++) {
+		struct ravb_rx_desc *desc = &priv->rgeth_rx_ring[q][i];
+
+		if (!dma_mapping_error(ndev->dev.parent,
+				       le32_to_cpu(desc->dptr)))
+			dma_unmap_single(ndev->dev.parent,
+					 le32_to_cpu(desc->dptr),
+					 RGETH_RX_BUFF_MAX,
+					 DMA_FROM_DEVICE);
+	}
+	ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1);
+	dma_free_coherent(ndev->dev.parent, ring_size, priv->rgeth_rx_ring[q],
+			  priv->rx_desc_dma[q]);
+	priv->rgeth_rx_ring[q] = NULL;
 }
 
 static void ravb_rx_ring_free(struct net_device *ndev, int q)
-- 
2.17.1