Comments (4)
from behavioral-model.
For the first option.
Indeed I will have some more roles that do not contain those "ecmp_group" and "forward". So does it mean I should use the second option that copy the tables and commands to new one with different name?
from behavioral-model.
from behavioral-model.
Just adding some more info to @dhankook answer. In theory, the compiler and software switch should allow you to invoke the same table from 2 different places in the control flow, providing the 2 invocations are mutually exclusive (i.e. the same packet cannot go through the same table twice). However, because of the way we process the control flow in the current P4 compiler (we transform it into a table graph), it is actually pretty difficult to allow this, so we just throw an error if the same table is "applied" twice. While there is no immediate plan to fix this in the current compiler, we are hoping the next compiler (for P4_16) will not have this limitation.
Regarding your specific use case, I'd like to point out that most people will probably achieve different roles by writing different P4 programs and swapping the programs on the target as needed. This can be done in bmv2 through the runtime CLI. When you include all your roles in a single P4 program, you may limit the amount of physical resources available for each role. While in bmv2 your programs can be arbitrarily complex, this won't be the case for hardware P4 targets.
from behavioral-model.
Related Issues (20)
- import thrift
- TCP packets seem not to be processed correctly by bmv2 HOT 2
- Problem using multicast in runtime HOT 1
- Empty action-parameter vector is always accessed in ActionFnEntry::execute HOT 3
- How to build behavioral-model on the MacOS(Apple M1 Pro(13.5)) HOT 1
- How to track fileds of metadata with p4dbg? HOT 2
- Approximate conversion of bmv2 p4 performance to hardware performance HOT 3
- Applying the same table twice HOT 2
- Required to set forwarding pipeline before using the dataplane for streaming packets HOT 10
- Update project to require C++17 HOT 9
- Race conditions when passing in a BMv2 JSON config HOT 12
- To Add PNA support into BMv2. HOT 5
- How to build simple_switch / simple_switch_grpc on Ubuntu 24.04 ? HOT 4
- Why bmi_port.c is a C code? HOT 2
- Race conditions when processing packet in the egress pipeline. HOT 6
- Heap Buffer Overflow when installing many table entries HOT 1
- CMake support HOT 2
- Queue metadata with multiqueue HOT 2
- Where is the original p4 source code for recirc.json HOT 8
- Consider implementing something like Tuple Space Search for ternary table lookups
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from behavioral-model.