Can someone clarify what is the difference between the two methods
r
eceive_raw() and receive() in NetClientInfo ?
tap seems to be the only backend actually implementing receive_raw(),
but apart from prepending a vnet_hdr i cannot tell what is this for,
and whether receive_raw() is a custom addon for tap, or it can be used
by other backends to implement different features.
The reason I am asking is that we are working on a fewer copies
path between guests, and one of the things we need is an
asynchronous receive so that a backend can notify the frontend
when a buffer has been actually consumed.
Right now nc-info-receive() and friends are all synchronous,
and there is no mechanism to support asynchronous completion,
which forces the backend to make a copy if it cannot
complete the request inline.
Hence i probably need to add another method to NetClientInfo
so that the frontend can register the callback, or pass it to
the backend together with the buffer/iov
thanks
luigi
