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De-magic NIC rx and tx registers, cleanup

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logicog
2026-01-11 07:51:18 +01:00
parent 4e8eb6d766
commit d2d7ab7ff1
3 changed files with 33 additions and 29 deletions
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rtlplayground.c
+12 -15
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@@ -819,7 +819,7 @@ void tcpip_output(void)
uip_buf[VLAN_TAG_SIZE + 2] = uip_buf[VLAN_TAG_SIZE + 3] = 0;
uip_buf[VLAN_TAG_SIZE + 6] = uip_buf[VLAN_TAG_SIZE + 7] = 0;
reg_read_m(0x7890);
reg_read_m(RTL837X_REG_CPU_TX_CURR_PKT);
uint16_t ring_ptr = ((uint16_t)sfr_data[2]) << 8;
ring_ptr |= sfr_data[3];
@@ -835,20 +835,20 @@ void tcpip_output(void)
// Move data over from xmem buffer to ASIC side using DMA
nic_tx_packet(ring_ptr);
reg_read_m(0x7884); // actual bytes sent, for now we assume everything worked
// New position of the ring-pointer on the NIC-side indicates number of bytes transmitted
reg_read_m(RTL837X_REG_NIC_TX_CURR_PKT);
// Do actual TX of data on ASIC side
sfr_data[0] = sfr_data[1] = sfr_data[2] = 0;
sfr_data[3] = 0x1;
reg_write_m(0x7850);
REG_SET(RTL837X_REG_NIC_TXCMD, 1);
}
void handle_rx(void)
{
reg_read_m(RTL837X_REG_RX_AVAIL);
// Check the amount of data available on the NIC/ASIC side
reg_read_m(RTL837X_REG_NIC_RX_BUFF_DATA);
if (sfr_data[2] != 0 || sfr_data[3] != 0) {
reg_read_m(RTL837X_REG_RX_RINGPTR);
reg_read_m(RTL837X_REG_CPU_RX_CURR_PKT);
uint16_t ring_ptr = ((uint16_t)sfr_data[2]) << 8;
ring_ptr |= sfr_data[3];
ring_ptr <<= 3;
@@ -872,16 +872,13 @@ void handle_rx(void)
write_char(' ');
}
#endif
sfr_data[0] = sfr_data[1] = sfr_data[2] = 0;
sfr_data[3] = 0x1;
reg_write_m(RTL837X_REG_RX_DONE);
REG_SET(RTL837X_REG_NIC_RXCMD, 1);
uip_len = (((uint16_t)rx_headers[5]) << 8) | rx_headers[4];
// write_char('>'); print_byte(uip_buf[ETHERTYPE_OFFSET]); write_char('<');
// write_char('>'); print_byte(uip_buf[ETHERTYPE_OFFSET + 1]); write_char('<');
// Check for ARP packet
rx_packet_vlan = uip_buf[12 + RTL_TAG_SIZE + 2] & 0xf;
// Retrieve VLAN from VLAN-tag
rx_packet_vlan = uip_buf[2 * sizeof (struct uip_eth_addr) + RTL_TAG_SIZE + 2] & 0xf;
rx_packet_vlan <<= 8;
rx_packet_vlan |= uip_buf[12 + RTL_TAG_SIZE + 3];
rx_packet_vlan |= uip_buf[2 * sizeof (struct uip_eth_addr) + RTL_TAG_SIZE + 3];
#ifdef RXTXDBG
print_string(" RX-VLAN: "); print_short(rx_packet_vlan); write_char('\n');
print_string(" RX dst: "); print_byte(uip_buf[0]); print_byte(uip_buf[1]); print_byte(uip_buf[2]);