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
