[OMPI devel] "unknown" in-coming fragment in sm BTL

[Eugene Loh]

In btl_sm_component.c, mca_btl_sm_component_progress() polls on FIFOs.  
If it gets something, it has a "switch" statement with cases for send 
fragments, returned fragments (ACKs) to be returned to the freelist, and 
default/unknown.  What's that default/unknown case about?  What behavior 
should it produce?  What assumptions does/can it make?  Is this a panic 
code path that should never be exercised?  Is it all right to let this 
code path break since it should never be encountered anyhow and the 
behavior doesn't even make sense?  (Someone sent me something.  They 
weren't supposed to and I don't know what to do with it.  So, I'm going 
to send it back to them.)