NAME

  FM_PartialDelivery.seq - Fragmented DATA chunks are received for reassembly (Partial Delivery)


PURPOSE

  To check that if the data receiver runs out of buffer space while still
  waiting for more fragments to complete the reassembly of the message, it
  should dispatch part of its inbound message through a partial delivery API.


SYNOPSIS

  ./FM_PartialDelivery.seq [-tooloption ...] -pkt ./FM_PartialDelivery.def
    -tooloption : v6eval tool option
  See Also: ../common/STD_PKT_COMMON.def
            ../common/SCTP_COMMON.def


PRE-TEST CONDITION

  Association is established between endpoint A and B. Arrange data 
  in endpoint A such that fragmented DATA messages are sent to
  endpoint B for reassembly.


TEST PROCEDURE

  Endpoint A                           Endpoint B                ULP
  (ESTABLISHED)                        (ESTABLISHED)
  DATA          ---------------->
  [TSN=0,B=1,E=0]
                <----------------       SACK
  DATA          ---------------->
  [TSN=1,B=0,E=0]
                <----------------       SACK 
                     ......
  DATA          ---------------->
  [TSN=47,B=0,E=1]
                <----------------       SACK
  TEST DESCRIPTION:
  1. Send DATA from endpoint A to B with B=1, E=0.
  2. Check A: DATA is not delivered to the ULP.
  3. Send DATA from endpoint A to B with B=0, E=0 until the
     data receiver runs out of buffer space.
  4. Check B: Fragmented DATA chunks is delivered to the ULP 
     after reassemble and be send back.
  5. Send DATA from endpoint A to B with B=0, E=1.
  6. Check C: Fragmented DATA chunks is delivered to the ULP 
     after reassemble and be send back.


NOTE

  None


REFERENCE

  RFC 4960
  6.9.  Fragmentation and Reassembly
    An endpoint MUST recognize fragmented DATA chunks by examining the
    B/E bits in each of the received DATA chunks, and queue the
    fragmented DATA chunks for reassembly.  Once the user message is
    reassembled, SCTP shall pass the reassembled user message to the
    specific stream for possible reordering and final dispatching.
    Note: If the data receiver runs out of buffer space while still
    waiting for more fragments to complete the reassembly of the message,
    it should dispatch part of its inbound message through a partial
    delivery API (see Section 10), freeing some of its receive buffer
    space so that the rest of the message may be received.