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[realtek] Explicitly disable VLAN offload

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Some cards seem to have the receive VLAN tag stripping feature enabled
by default, which causes received VLAN packets to be misinterpreted as
being received by the trunk device.

Fix by disabling VLAN tag stripping in the C+ Command Register.

Debugged-by: Xinming Lai <yiyihu@gmail.com>
Tested-by: Xinming Lai <yiyihu@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-02-01 18:19:32 +00:00
parent aa85c2918a
commit b6304f2984
2 changed files with 7 additions and 2 deletions
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src/drivers/net/realtek.c
+4
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@@ -1067,11 +1067,15 @@ static void realtek_detect ( struct realtek_nic *rtl ) {
* Note that enabling DAC seems to cause bizarre behaviour
* (lockups, garbage data on the wire) on some systems, even
* if only 32-bit addresses are used.
*
* Disable VLAN offload, since some cards seem to have it
* enabled by default.
*/
cpcr = readw ( rtl->regs + RTL_CPCR );
cpcr |= ( RTL_CPCR_MULRW | RTL_CPCR_CPRX | RTL_CPCR_CPTX );
if ( sizeof ( physaddr_t ) > sizeof ( uint32_t ) )
cpcr |= RTL_CPCR_DAC;
cpcr &= ~RTL_CPCR_VLAN;
writew ( cpcr, rtl->regs + RTL_CPCR );
check_cpcr = readw ( rtl->regs + RTL_CPCR );