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Introduce the Prague congestion control #1708

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Introduce the Prague congestion control #1708

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Commits on Jan 10, 2024

  1. report ECN counts 

    This adds support for reporting incoming ECN counts via the "ECN Counts"
field in ACK frames.

Applications can report the ECN marking for incoming packets through the
new `ecn` field of `RecvInfo`, and internally quiche will track the ECN
counters, and creates ACK frames with the ECN Counts field.

TODO:
* Fetch ECN markings for incoming packets in apps.
    @ghedo @qdeconinck
    ghedo authored and qdeconinck committed Jan 10, 2024
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  2. mark outgoing packets with ECN 

    TODO:
* Set ECN markings for outgoing packets in apps.
* Probe ECN for each path.
* Validate ECN counts in ACKs.
    @ghedo @qdeconinck
    ghedo authored and qdeconinck committed Jan 10, 2024
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  3. ECN ACK validation and probing on paths

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  4. making quiche apps ECN-capable

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  5. build (windows and nginx) and test (multiarch) fixes

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  6. keep ECN counts when migrating

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  7. provide use_ect1 argument in server config

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  8. recvfrom: don't assume memory layout

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  9. remove useless parentheses + clippy fixes

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  10. prague: initial potential complete implementation

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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  11. prague: add a first test and fixes

    @qdeconinck
    qdeconinck committed Jan 10, 2024
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