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4489a61585
Implement a new method for QUIC pacing emission based on credit. This represents the number of packets which can be emitted in a single burst. After emission, decrement from the credit the number of emitted packets. Several emission can be conducted in the same sequence until the credit is completely decremented. When a new emission sequence is initiated (i.e. under a new QMUX tasklet invokation), credit is refilled according to the delay which occured between the last and current emission context. This new mechanism main advantage is that it allows to conduct several emission in the same task context without having to wait between each invokation. Wait is only forced if pacing is expired, which is now equivalent to having a null credit. Furthermore, if delay between two emissions sequence would have been smaller than expected, credit is only partially refilled. This allows to restart emission without having to wait for the whole credit to be available. On the implementation side, a new field <credit> is avaiable in quic_pacer structure. It is automatically decremented on quic_pacing_sent_done() invokation. Also, a new function quic_pacing_reload() must be used by QUIC MUX when a new emission sequence is initiated to refill credit. <next> field from quic_pacer has been removed. For the moment, credit is based on the burst configured via quic-cc-algo keyword, or directly reported by BBR. This should be backported up to 3.1.