tree b800103824f92048245a8c3fe6ce4e8f287b6dc9
parent 31d2057c59f8e8b7091c98a3516ad779ea571a8a
author Amaury Denoyelle <adenoyelle@haproxy.com> 1672753164 +0100
committer Amaury Denoyelle <adenoyelle@haproxy.com> 1673369390 +0100

MAJOR: mux-quic: rework stream sending priorization

Implement a mechanism to register streams ready to send data in new
STREAM frames. Internally, this is implemented with a new list
<qcc.send_list> which contains qcs instances.

A qcs can be registered safely using the new function qcc_send_stream().
This is done automatically in qc_send_buf() which covers most cases.
Also, application layer is free to use it for internal usage streams.
This is currently the case for H3 control stream with SETTINGS sending.

The main point of this patch is to handle stream sending fairly. This is
in stark contrast with previous code where streams with lower ID were
always prioritized. This could cause other streams to be indefinitely
blocked behind a stream which has a lot of data to transfer. Now,
streams are handled in an order scheduled by se_desc layer.

This commit is the first one of a serie which will bring other
improvments which also relied on the send_list implementation.

This must be backported up to 2.7 when deemed sufficiently stable.