For MRI, include the IP options in the IP checksum.

[robertsoule-barefoot]

Need to check how to modify the checksum function to take in header stacks as input.

[NofelYaseen]

Here are few ideas:

1. When computing checksum, check each header stack index exists and update the checksum.
2. Change the design of mri. Rather than having a stack, add a fixed size header, something like:

header mri_t {
    bit<16>  count;
    switchID_t  swid1;
    qdepth_t    qdepth1;
    switchID_t  swid2;
    qdepth_t    qdepth2;
    switchID_t  swid2;
    qdepth_t    qdepth2;
}

3. If the end goal is to process some header within the network only, you can remove the header before forwarding to the host.

4. Add the switchId to checksum field.