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c44692356d
This patch is the first of two to reimplement flow control emission limits check. The objective is to account flow control earlier during snd_buf stream callback. This should smooth transfers and prevent over buffering on haproxy side if flow control limit is reached. The current patch deals with stream level flow control. It reuses the newly defined flow control type. Soft offset is incremented after HTX to data conversion. If limit is reached, snd_buf is interrupted and stream layer will subscribe on QCS. On qcc_io_cb(), generation of STREAM frames is restricted as previously to ensure to never surpass peer limits. Finally, flow control real offset is incremented on lower layer send notification. Thus, it will serve as a base offset for built STREAM frames. If limit is reached, STREAM frames generation is suspended. Each time QCS data flow control limit is reached, soft and real offsets are reconsidered. Finally, special care is used when flow control limit is incremented via MAX_STREAM_DATA reception. If soft value is unblocked, stream layer snd_buf is woken up. If real value is unblocked, qcc_io_cb() is rescheduled. |
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