From c81d894226b94439c543e9cfac406c8024172fd7 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Wed, 25 Aug 2021 08:01:42 +0100 Subject: ravb: Remove the macros NUM_TX_DESC_GEN[23] For addressing 4 bytes alignment restriction on transmission buffer for R-Car Gen2 we use 2 descriptors whereas it is a single descriptor for other cases. Replace the macros NUM_TX_DESC_GEN[23] with magic number and add a comment to explain it. Signed-off-by: Biju Das Suggested-by: Geert Uytterhoeven Reviewed-by: Lad Prabhakar Signed-off-by: David S. Miller --- drivers/net/ethernet/renesas/ravb.h | 4 ---- drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++-- 2 files changed, 6 insertions(+), 6 deletions(-) (limited to 'drivers/net/ethernet/renesas') diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h index 37ad0f8aaf3c..84700a82a41c 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -956,10 +956,6 @@ enum RAVB_QUEUE { #define RX_BUF_SZ (2048 - ETH_FCS_LEN + sizeof(__sum16)) -/* TX descriptors per packet */ -#define NUM_TX_DESC_GEN2 2 -#define NUM_TX_DESC_GEN3 1 - struct ravb_tstamp_skb { struct list_head list; struct sk_buff *skb; diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 02842b980a7f..073e690ab830 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2160,8 +2160,12 @@ static int ravb_probe(struct platform_device *pdev) ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); ndev->min_mtu = ETH_MIN_MTU; - priv->num_tx_desc = info->aligned_tx ? - NUM_TX_DESC_GEN2 : NUM_TX_DESC_GEN3; + /* FIXME: R-Car Gen2 has 4byte alignment restriction for tx buffer + * Use two descriptor to handle such situation. First descriptor to + * handle aligned data buffer and second descriptor to handle the + * overflow data because of alignment. + */ + priv->num_tx_desc = info->aligned_tx ? 2 : 1; /* Set function */ ndev->netdev_ops = &ravb_netdev_ops; -- cgit v1.2.3-59-g8ed1b