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96199b1016
The splicing is now provided by the data-layer rcv_pipe/snd_pipe functions which in turn are called by the stream interface's recv and send callbacks. The presence of the rcv_pipe/snd_pipe functions is used to attest support for splicing at the data layer. It looks like the stream-interface's SI_FL_CAP_SPLICE flag does not make sense anymore as it's used as a proxy for the pointers above. It also appears that we call chk_snd() from the recv callback and then try to call it again in update_conn(). It is very likely that this last function will progressively slip into the recv/send callbacks in order to avoid duplicate check code. The code works right now with and without splicing. Only raw_sock provides support for it and it is automatically selected when the various splice options are set. However it looks like splice-auto doesn't enable it, which possibly means that the streamer detection code does not work anymore, or that it's only called at a time where it's too late to enable splicing (in process_session).