8000 load_balancing: more guidance needed for use of hash() · Issue #96 · p4lang/tutorials · GitHub
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load_balancing: more guidance needed for use of hash() #96
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load_balancing: more guidance needed for use of hash()#96
@liujed

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@liujed
liujed
opened on Nov 13, 2017
  • Slide 78 of P4D2_2017_Fall/P4_tutorial_labs.pdf has information on the signature of hash() that should be copied into load_balancing.p4.
  • Comments for ecmp_base and ecmp_count are needed in load_balancing p4. (Otherwise, I wouldn't know to use them for baseand max in the call to hash().)
  • Hash algorithm is unspecified. (Need to say CRC16 somewhere.)
  • Attempts based on example usage in PSA spec didn't work. My attempt:
Hash<bit<14>>(HashAlgorithm_t.CRC16) h;
meta.ecmp_select =
  h.get_hash({hdr.ipv4.srcAddr, hdr.ipv4.dstAddr,
    hdr.ipv4.protocol, hdr.tcp.srcPort, hdr.tcp.dstPort});

Resulting error:

syntax error, unexpected IDENTIFIER, expecting ;
        Hash<bit<14>>(HashAlgorithm_t.CRC16) h
                                             ^
3822

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