TdiBuildReceive question

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Hi, folks,
If I submits a Irp built by TdiBuildReceive to tcpip.sys, is it possible when the Irp is completed neither it's buffer is filled fully nor the connection is aborted or closed?
My driver never expects the Irp is completed before the buffer is full if the connection is ESTABLISH state. However, I meet it in the real world, e.g. Irp->IoStatus.Status = STATUS_SUCCESS, Irp->IoStatus.Information < the size of the buffer. And I never set TDI_RECEIVE_PEEK.
The WDK mentioned:
" Unless the TDI_RECEIVE_PEEK flag is set, the underlying transport fills the given buffer with received data until the client's buffer is full or the *transport receives an end-of-record indication from the remote node*."
What's the meaning of end-of-record indication for tcp connection?
Thanks a lot for your help.
.

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