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Cannot send a tagged VLAN packet over i210/i350/i225 NICs

john4567
Beginner
‎10-18-2023 10:47 AM
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I have a proprietary RTOS that has the drivers for these NICs that I am modifying to support VLAN.

I also have the spec of all these NICs and went over them several times trying to find a clue why the NICs block a transmit packet that has the VLAN type 0x8100.

The NICs work fine without VLAN tagging.

I have the VLAN 4 byte tag as part of the Ethernet Header when the stack sends it to the driver, so I am not using the the transmit descriptor to instruct the controller to insert the VLAN tag.

When I change in the header 0x8100 to some invalid value like 0x8200 the packet goes on the wire which I can capture using Wireshark running on a Linux machine connected to the same Ethernet switch.

 

Is there anything I have to configure in the NIC to allow the VLAN packet to pass through and get on the wire?

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