netdev - [PATCH net-next v2 2/8] ravb: Add skb_sz to struct ravb_hw

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Date:   Mon,  2 Aug 2021 11:26:48 +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>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.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>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH net-next v2 2/8] ravb: Add skb_sz to struct ravb_hw_info

The maximum descriptor size that can be specified on the reception side for
R-Car is 2048 bytes, whereas for RZ/G2L it is 8096.

Add the skb_size variable to struct ravb_hw_info for allocating different
skb buffer sizes for R-Car and RZ/G2L using the netdev_alloc_skb function.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
v2:
 * Incorporated Andrew and Sergei's review comments for making it smaller patch
   and provided detailed description.
---
 drivers/net/ethernet/renesas/ravb.h      |  1 +
 drivers/net/ethernet/renesas/ravb_main.c | 10 ++++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index cfb972c05b34..16d1711a0731 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -991,6 +991,7 @@ enum ravb_chip_id {
 struct ravb_hw_info {
 	enum ravb_chip_id chip_id;
 	int num_tx_desc;
+	size_t skb_sz;
 };
 
 struct ravb_private {
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index ffbd224d8780..08146c1975e5 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -339,6 +339,7 @@ static void ravb_ring_format(struct net_device *ndev, int q)
 static int ravb_ring_init(struct net_device *ndev, int q)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
+	const struct ravb_hw_info *info = priv->info;
 	int num_tx_desc = priv->num_tx_desc;
 	struct sk_buff *skb;
 	int ring_size;
@@ -353,7 +354,7 @@ static int ravb_ring_init(struct net_device *ndev, int q)
 		goto error;
 
 	for (i = 0; i < priv->num_rx_ring[q]; i++) {
-		skb = netdev_alloc_skb(ndev, RX_BUF_SZ + RAVB_ALIGN - 1);
+		skb = netdev_alloc_skb(ndev, info->skb_sz);
 		if (!skb)
 			goto error;
 		ravb_set_buffer_align(skb);
@@ -535,6 +536,7 @@ static void ravb_rx_csum(struct sk_buff *skb)
 static bool ravb_rx(struct net_device *ndev, int *quota, int q)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
+	const struct ravb_hw_info *info = priv->info;
 	int entry = priv->cur_rx[q] % priv->num_rx_ring[q];
 	int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) -
 			priv->cur_rx[q];
@@ -619,9 +621,7 @@ static bool ravb_rx(struct net_device *ndev, int *quota, int q)
 		desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
 
 		if (!priv->rx_skb[q][entry]) {
-			skb = netdev_alloc_skb(ndev,
-					       RX_BUF_SZ +
-					       RAVB_ALIGN - 1);
+			skb = netdev_alloc_skb(ndev, info->skb_sz);
 			if (!skb)
 				break;	/* Better luck next round. */
 			ravb_set_buffer_align(skb);
@@ -1927,11 +1927,13 @@ static int ravb_mdio_release(struct ravb_private *priv)
 static const struct ravb_hw_info ravb_gen3_hw_info = {
 	.chip_id = RCAR_GEN3,
 	.num_tx_desc = NUM_TX_DESC_GEN3,
+	.skb_sz = RX_BUF_SZ + RAVB_ALIGN - 1,
 };
 
 static const struct ravb_hw_info ravb_gen2_hw_info = {
 	.chip_id = RCAR_GEN2,
 	.num_tx_desc = NUM_TX_DESC_GEN2,
+	.skb_sz = RX_BUF_SZ + RAVB_ALIGN - 1,
 };
 
 static const struct of_device_id ravb_match_table[] = {
-- 
2.17.1