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RTL8169: Difference between revisions
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Line 12:
ex:
<source lang="c">
char i;
for (i = 0; i < 6; i++)
Line 17 ⟶ 18:
mac_address[i] = inportb(ioaddr + i); /*ioaddr is the base address obtainable from the PCI device configuration space.*/
}
</source>
=== Reset the Chip ===
Line 23 ⟶ 25:
ex:
<source lang="c">
outportb(ioaddr + 0x37, 0x10); /*set the Reset bit (0x10) to the Command Register (0x37)*/
while(inportb(ioaddr + 0x37) & 0x10)
;/*setting a timeout could be useful if the card is problematic*/
</source>
== Setting up the Rx Descriptors ==
Line 34 ⟶ 38:
eg:
<source lang="c">
struct Descriptor
{
Line 60 ⟶ 65:
}
}
</source>
== Configuring RxConfig and TxConfig ==
Line 69 ⟶ 75:
eg:
<source lang="c">
outportl(ioaddr + 0x40, 0x03000700); /* IFG: normal, MXDMA: unlimited */
</source>
=== RxConfig ===
Line 75 ⟶ 83:
eg:
<source lang="c">
outportl(ioaddr + 0x44, 0x0000E70F) /* RXFTH: unlimited, MXDMA: unlimited, AAP: set (promisc. mode set) */
</source>
== Max Packet Sizes ==
=== Max Transmit Packet Size ===
Line 82 ⟶ 91:
eg:
<source lang="c">
outportb(ioaddr + 0xEC, 0x3B); /* Maximum tx packet size */
</source>
=== Receive Packet Maximum Size ===
The RMS register is located at offset 0xDA and is used for setting the maximum packet size that can be received into the NIC. If set to zero, the NIC will accept no packets (must be set prior to normal operation!). The maximum size that can be set is 0x3FFF (16k - 1), but if a packet larger than 8k is received error bits are set and a lengthier process must be started in order to determine if the packet is actually good or not. I keep this value to 0x1FFF (8k - 1) as it is rare to receive such large packets and it also ensures that error packets are actually error packets and not false positives.
eg:
<source lang="c">
outportw(ioaddr + 0xDA, 0x1FFF); /* Maximum rx packet size */
</source>
== Full Reset Example ==
This is a barebones example of how to reset the RTL8169 without anything like auto-negotiation (explained later) or (G)MII interactions.
eg:
<source lang="c">
struct Descriptor
{
Line 149 ⟶ 161:
outportb(ioaddr + 0x50, 0x00); /* Lock config registers */
}
</source>
== External Links ==
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