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Message-Id: <20210923140813.13541-17-biju.das.jz@bp.renesas.com>
Date: Thu, 23 Sep 2021 15:08:11 +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 16/18] ravb: Add Packet receive function for Gigabit Ethernet
This patch series adds RX(packet receive) function for
Gigabit Ethernet found on RZ/G2L SoC.
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
drivers/net/ethernet/renesas/ravb.h | 1 +
drivers/net/ethernet/renesas/ravb_main.c | 157 ++++++++++++++++++++++-
2 files changed, 156 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index b0e067a6a8ee..85260f89e1cd 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1092,6 +1092,7 @@ struct ravb_private {
int duplex;
struct ravb_rx_desc *rgeth_rx_ring[NUM_RX_QUEUE];
+ struct sk_buff *rxtop_skb;
const struct ravb_hw_info *info;
struct reset_control *rstc;
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index a08da7a37b92..867e180e6655 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -705,6 +705,23 @@ static void ravb_get_tx_tstamp(struct net_device *ndev)
}
}
+static void ravb_rx_csum_rgeth(struct sk_buff *skb)
+{
+ u8 *hw_csum;
+
+ /* The hardware checksum is contained in sizeof(__sum16) (2) bytes
+ * appended to packet data
+ */
+ if (unlikely(skb->len < sizeof(__sum16)))
+ return;
+ hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
+
+ if (*hw_csum == 0)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ else
+ skb->ip_summed = CHECKSUM_NONE;
+}
+
static void ravb_rx_csum(struct sk_buff *skb)
{
u8 *hw_csum;
@@ -720,11 +737,147 @@ static void ravb_rx_csum(struct sk_buff *skb)
skb_trim(skb, skb->len - sizeof(__sum16));
}
+static struct sk_buff *ravb_get_skb_rgeth(struct net_device *ndev, int q,
+ int entry, struct ravb_rx_desc *desc)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct sk_buff *skb;
+
+ skb = priv->rx_skb[q][entry];
+ priv->rx_skb[q][entry] = NULL;
+ dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
+ ALIGN(RGETH_RX_BUFF_MAX, 16), DMA_FROM_DEVICE);
+
+ return skb;
+}
+
/* Packet receive function for Gigabit Ethernet */
static bool ravb_rgeth_rx(struct net_device *ndev, int *quota, int q)
{
- /* Place holder */
- return true;
+ struct ravb_private *priv = netdev_priv(ndev);
+ 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];
+ struct net_device_stats *stats = &priv->stats[q];
+ struct ravb_rx_desc *desc;
+ struct sk_buff *skb;
+ dma_addr_t dma_addr;
+ u8 desc_status;
+ u8 die_dt;
+ u16 pkt_len;
+ int limit;
+
+ boguscnt = min(boguscnt, *quota);
+ limit = boguscnt;
+ desc = &priv->rgeth_rx_ring[q][entry];
+ while (desc->die_dt != DT_FEMPTY) {
+ /* Descriptor type must be checked before all other reads */
+ dma_rmb();
+ desc_status = desc->msc;
+ pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
+
+ if (--boguscnt < 0)
+ break;
+
+ /* We use 0-byte descriptors to mark the DMA mapping errors */
+ if (!pkt_len)
+ continue;
+
+ if (desc_status & MSC_MC)
+ stats->multicast++;
+
+ if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | MSC_CEEF)) {
+ stats->rx_errors++;
+ if (desc_status & MSC_CRC)
+ stats->rx_crc_errors++;
+ if (desc_status & MSC_RFE)
+ stats->rx_frame_errors++;
+ if (desc_status & (MSC_RTLF | MSC_RTSF))
+ stats->rx_length_errors++;
+ if (desc_status & MSC_CEEF)
+ stats->rx_missed_errors++;
+ } else {
+ die_dt = desc->die_dt & 0xF0;
+ switch (die_dt) {
+ case DT_FSINGLE:
+ skb = ravb_get_skb_rgeth(ndev, q, entry, desc);
+ skb_put(skb, pkt_len);
+ skb->protocol = eth_type_trans(skb, ndev);
+ if (ndev->features & NETIF_F_RXCSUM)
+ ravb_rx_csum_rgeth(skb);
+ napi_gro_receive(&priv->napi[q], skb);
+ stats->rx_packets++;
+ stats->rx_bytes += pkt_len;
+ break;
+ case DT_FSTART:
+ priv->rxtop_skb = ravb_get_skb_rgeth(ndev, q, entry, desc);
+ skb_put(priv->rxtop_skb, pkt_len);
+ break;
+ case DT_FMID:
+ skb = ravb_get_skb_rgeth(ndev, q, entry, desc);
+ skb_copy_to_linear_data_offset(priv->rxtop_skb,
+ priv->rxtop_skb->len,
+ skb->data,
+ pkt_len);
+ skb_put(priv->rxtop_skb, pkt_len);
+ dev_kfree_skb(skb);
+ break;
+ case DT_FEND:
+ skb = ravb_get_skb_rgeth(ndev, q, entry, desc);
+ skb_copy_to_linear_data_offset(priv->rxtop_skb,
+ priv->rxtop_skb->len,
+ skb->data,
+ pkt_len);
+ skb_put(priv->rxtop_skb, pkt_len);
+ dev_kfree_skb(skb);
+ priv->rxtop_skb->protocol =
+ eth_type_trans(priv->rxtop_skb, ndev);
+ if (ndev->features & NETIF_F_RXCSUM)
+ ravb_rx_csum_rgeth(skb);
+ napi_gro_receive(&priv->napi[q],
+ priv->rxtop_skb);
+ stats->rx_packets++;
+ stats->rx_bytes += priv->rxtop_skb->len;
+ break;
+ }
+ }
+
+ entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
+ desc = &priv->rgeth_rx_ring[q][entry];
+ }
+
+ /* Refill the RX ring buffers. */
+ for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
+ entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
+ desc = &priv->rgeth_rx_ring[q][entry];
+ desc->ds_cc = cpu_to_le16(RGETH_RX_DESC_DATA_SIZE);
+
+ if (!priv->rx_skb[q][entry]) {
+ skb = netdev_alloc_skb(ndev,
+ RGETH_RX_BUFF_MAX + RAVB_ALIGN - 1);
+ if (!skb)
+ break;
+ ravb_set_buffer_align(skb);
+ dma_addr = dma_map_single(ndev->dev.parent,
+ skb->data,
+ le16_to_cpu(desc->ds_cc),
+ DMA_FROM_DEVICE);
+ skb_checksum_none_assert(skb);
+ /* 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))
+ desc->ds_cc = cpu_to_le16(0);
+ desc->dptr = cpu_to_le32(dma_addr);
+ priv->rx_skb[q][entry] = skb;
+ }
+ /* Descriptor type must be set after all the above writes */
+ dma_wmb();
+ desc->die_dt = DT_FEMPTY;
+ }
+
+ *quota -= limit - (++boguscnt);
+
+ return boguscnt <= 0;
}
/* Packet receive function for Ethernet AVB */
--
2.17.1
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