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Add missing constant type
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assignments/p4runtime/README.md

@@ -41,13 +41,13 @@ based on the tunnel ID.
 ## Step 2: Implement the rules and counters
 
 1. In the `mycontroller.py` file, write your ingress transit rules inside the `writeTunnelRules` function. It should be similar to the egress transit rules already implemented on the file.
-2. In the `basic.p4` file, add a new constant to your code called `MAX_TUNNEL_ID`, and it's value must be `1 << 16`.
-3. On ingress, add two counters (`ingressTunnelCounter`, `egressTunnelCounter`). They must receive two parameters, first the previously created constant, second `CounterType.packets_and_bytes`). Refer to the cheat sheet for more information on the syntax.
-4. On ingress, implement an action called `myTunnel_ingress`, the action must receive a 16 bit parameter called `dst_id`. The action must do the following:
+2. In the `basic.p4` file, add a new 32-bit constant to your code called `MAX_TUNNEL_ID`, and it's value must be `1 << 16`.
+3. On ingress, add two counters (`ingressTunnelCounter`, `egressTunnelCounter`). They must receive two parameters, first the previously created constant, second `CounterType.packets_and_bytes`. Refer to the cheat sheet for more information on the syntax.
+4. On ingress, implement an action called `myTunnel_ingress`, the action must receive a 16-bit parameter called `dst_id`. The action must do the following:
    1. Set the valid bit on the `myTunnel` packet header.
-   2. Set the `dst_id`, `proto_id` and `etherType` of the tunnel header.
+   2. Set the `dst_id` and `proto_id` of the tunnel header.
    3. Increment the `ingressTunnelCounter` of the `dst_id` tunnel header index. Cast the index type to `bit<32>`.
-5. On ingress, implement an action called `myTunnel_egress`, the action must receive two parameters in the following order: first a parameter called `dstAddr` with our mac address type defined on the code, second a parameter called `port`  with our egress type also defined on the code. The action must do the following:
+5. On ingress, implement an action called `myTunnel_egress`, the action must receive two parameters in the following order: first a parameter called `dstAddr` with our MAC address type defined on the code, second a parameter called `port`  with our egress type also defined on the code. The action must do the following:
    1. Set the value of `egress_spec` attribute of the `standard_metadata` to `port`.
    2. Set the `dstAddr` and `etherType` of the ethernet header to `dstAddr` and the tunnel's `proto_id`, respectively.
    3. Set the invalid bit on the `myTunnel` packet header.