Can global registers be implemented？

[ghost]

I want to make _deqqdepth (from _egress_intrinsic_metadatat) available in the SwitchIngress. So I try to declare a global Register, and the same register will be used by RegisterAction defined in SwitchIngress and SwitchEgress. In this way, the data can be shared between SwitchIngress and SwitchEgress.

The p4 code looks like:

Register<T, I>(size, initial_value) global_reg;

control SwitchIngress(...) {
    RegisterAction<T, I, U>(global_reg) global_reg_action1 = {...};

    apply {
        ...;
        global_reg_action1.execute(idx);
    }
}

control SwitchEgress(...) {
    RegisterAction<T, I, U>(global_reg) global_reg_action2= {...};

    apply {
        ...;
        global_reg_action2.execute(idx);
    }
}

However, it seems like impossible to implement.

I wonder if there is any approach to achieve this "global register"? Thanks a lot.

[vgurevich]

@zhma989, The main purpose of this repository is to publish the interfaces, which, in turn, makes it possible for everyone to publish their code.

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