[RFC/PATCH 14/18] ravb: Add rx_ring_format function for GbEthernet
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: 2021-09-23 14:09:08
Also in:
linux-renesas-soc
Subsystem:
networking drivers, renesas ethernet avb driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Niklas Söderlund, Linus Torvalds
This patch adds rx_ring_format function for GbEthernet found on RZ/G2L SoC. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 27 +++++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 2505de5d4a28..b0e067a6a8ee 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h@@ -982,6 +982,7 @@ enum CSR0_BIT { #define RX_BUF_SZ (2048 - ETH_FCS_LEN + sizeof(__sum16)) #define RGETH_RX_BUFF_MAX 8192 +#define RGETH_RX_DESC_DATA_SIZE 4080 struct ravb_tstamp_skb { struct list_head list;
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 038af36141bb..ee1066fedc4a 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c@@ -327,7 +327,32 @@ static void ravb_ring_free(struct net_device *ndev, int q) static void ravb_rx_ring_format_rgeth(struct net_device *ndev, int q) { - /* Place holder */ + struct ravb_private *priv = netdev_priv(ndev); + struct ravb_rx_desc *rx_desc; + unsigned int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q]; + dma_addr_t dma_addr; + unsigned int i; + + memset(priv->rgeth_rx_ring[q], 0, rx_ring_size); + /* Build RX ring buffer */ + for (i = 0; i < priv->num_rx_ring[q]; i++) { + /* RX descriptor */ + rx_desc = &priv->rgeth_rx_ring[q][i]; + rx_desc->ds_cc = cpu_to_le16(RGETH_RX_DESC_DATA_SIZE); + dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data, + RGETH_RX_BUFF_MAX, + DMA_FROM_DEVICE); + /* We just set the data size to 0 for a failed mapping which + * should prevent DMA from happening... + */ + if (dma_mapping_error(ndev->dev.parent, dma_addr)) + rx_desc->ds_cc = cpu_to_le16(0); + rx_desc->dptr = cpu_to_le32(dma_addr); + rx_desc->die_dt = DT_FEMPTY; + } + rx_desc = &priv->rgeth_rx_ring[q][i]; + rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]); + rx_desc->die_dt = DT_LINKFIX; /* type */ } static void ravb_rx_ring_format(struct net_device *ndev, int q)
--
2.17.1