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Chapter 1 17
LLA to DLPI Migration
Receiving Data
Receiving Data
LLA does not automatically return LLC header information when
packets are read by the user. The user is required to issue a separate
control request (FRAME_HEADER) to get the LLC header information
for the last packet received.
DLPI returns the LLC header information in the control portion of each
individually received packet (i.e. DL_UNITDATA_IND, DL_XID_IND,
DL_TEST_IND, etc). The user is not required to issue a separate control
request to get LLC header information.
LLA only allows a maximum of 16 packets (for normal users and 64 for
super users) to be queued before it starts dropping data.
DLPI will read as many packets as possible until both the stream head
read queue (default is about 10k bytes) and DLPI read queue (default is
about 60K bytes) fill. When both these queues are full, DLPI will begin
dropping data until the queues start draining.