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risc-v/litex: Improve ethernet packet reception.

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In the default configuration, the Litex ethernet peripheral contains two RX and two TX buffers. The active buffer for the peripheral should be swapped as soon as possible, in order to reduce packet loss.

This modification acknowledges the receive buffer as soon as the pending data is copied into the NuttX device data buffer. Improving reliability under heavy load.
This commit is contained in:
Stuart Ianna
2023-06-26 15:17:44 +10:00
committed by Xiang Xiao
parent 7f80b4aeba
commit d94013837e
1 changed files with 12 additions and 6 deletions
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arch/risc-v/src/litex/litex_emac.c
+12 -6
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@@ -540,6 +540,12 @@ static void litex_receive(struct litex_emac_s *priv)
if (priv->dev.d_len == 0 || priv->dev.d_len > ETHMAC_SLOT_SIZE)
{
NETDEV_RXDROPPED(&priv->dev);
/* The pending flag for the receive buffer needs to be ack'd,
* even if the received packet is flagged as invalid.
*/
putreg8(0x01, LITEX_ETHMAC_SRAM_WRITER_EV_PENDING);
return;
}
@@ -553,6 +559,12 @@ static void litex_receive(struct litex_emac_s *priv)
priv->dev.d_len);
litex_dumppacket("Rx Packet", g_buffer, priv->dev.d_len);
/* ACK the pending flag AFTER receiving and processing data.
* This transitions the receive slot in hardware.
*/
putreg8(0x01, LITEX_ETHMAC_SRAM_WRITER_EV_PENDING);
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled, feed the frame into the tap */
@@ -664,12 +676,6 @@ static void litex_emac_interrupt_work(void *arg)
if (getreg32(LITEX_ETHMAC_SRAM_WRITER_EV_PENDING) & 0x01)
{
litex_receive(priv);
/* ACK the pending flag AFTER receiving and processing data.
* This transitions the receive slot in hardware.
*/
putreg8(0x01, LITEX_ETHMAC_SRAM_WRITER_EV_PENDING);
}
/* Tx Done */