netdev - [RFC/PATCH 15/18] ravb: Add rx_alloc helper function for GbEthernet

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Message-Id: <20210923140813.13541-16-biju.das.jz@bp.renesas.com>
Date:   Thu, 23 Sep 2021 15:08:10 +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 15/18] ravb: Add rx_alloc helper function for GbEthernet

This patch adds rx_alloc helper function for GbEthernet found on
RZ/G2L SoC.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index ee1066fedc4a..a08da7a37b92 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -430,8 +430,15 @@ static void ravb_ring_format(struct net_device *ndev, int q)
 
 static void *ravb_rgeth_alloc_rx_desc(struct net_device *ndev, int q)
 {
-	/* Place holder */
-	return NULL;
+	struct ravb_private *priv = netdev_priv(ndev);
+	unsigned int ring_size;
+
+	ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1);
+
+	priv->rgeth_rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
+						    &priv->rx_desc_dma[q],
+						    GFP_KERNEL);
+	return priv->rgeth_rx_ring[q];
 }
 
 static void *ravb_alloc_rx_desc(struct net_device *ndev, int q)
-- 
2.17.1