Hello All,
I was trying SW Vlan implementation today. There is a problem i am facing.
There are some issues with respect to
protocol type field in the ethernet packet.
following are the obervations:
1. When the client receives a packet from the server, the Vlan id is
stripped by hardware.
The ProtocolType = 0x8000 instead of 0x8100 (VLAN tagged packet type).
The MNP first checks the protocol type in vlan is configured. Since it
does not match Vlan
tagged packet type, it drops the frames.
if (ProtocolType != ETHER_TYPE_VLAN) {
//
// Not a VLAN tagged frame
//
return FALSE;
}
This code snippet is present in MnpRemoveVlanTag function.
2. Modified the packet type to 0x8100, the MNP successfully finds the vlan
tag. There is a
default config data for each configured mnp instance. This config is
driven by IP. This config
data has protocol type = 0x8000. Since we have modified the protocol
type to 0x8100, the enqueueing
of the packet to IP layer fails.
In MnpMatchPacket fucntion, the code snippet copied below is dropping
frames, since
ConfigData->ProtocolTypeFilter = 0x8000 and . RxData->ProtocolType =
0x8100.
if ((ConfigData->ProtocolTypeFilter != 0) &&
(ConfigData->ProtocolTypeFilter != RxData->ProtocolType)) {
return FALSE;
}
Please let me know if my understanding is correct. all sugessions are
appreciated.
Thanks,
Sajeesh.
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