[quicwg/base-drafts] ECN Algorithm (#2755)

[Martin Thomson <[e-mail]>]

ECN-capable is not a constant condition, but we don't have any algorithm that governs it.

I don't think that we can just say "mark until validation of ECN counts fails".  Maybe the following algorithm is OK:

When starting a new path:

0. set ECN state to "testing"
1. after N packets or M round trips, set ECN state to "unknown"
2. on every ACK, check ECN counts
3. if ECN validation fails set ECN state to "failed".
4. if ECN validation passes and ECN state is "uncertain", set it to "capable".
5. when sending packets, mark with ECT(0) if state is "testing" or "capable"

(I know that this is unchanged text, but I just realized that we could be clearer.)

Gorry pointed out that we can add an extra thing: if a path is marked as "failed", you MAY choose to occasionally switch back to "testing".

Mirja pointed out that we need to deal with bleaching more than we need to worry about black holes.  We should negotiate that.

_Originally posted by @martinthomson in https://github.com/quicwg/base-drafts/pull/2752/files_

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