All three stashes distilled into docs and dropped: xdp.md carries the AF_XDP record (ixgbe's 3 KB single-buffer XDP cap excludes the locked jumbo mix; XSK need_wakeup TX as the spin-free flow control, zero-copy-or-die, the stray-RX fill-ring trap, BTF-resolved stamp kfunc, wire-weighted size schedule as an unadopted option); connectx-5 README gains the PCICONF/ICMD/MCIA gateway constants so a rebuild needs no mstflint re-mine; e810 keeps the read-side transport map (cage-cache, bus=port, bus-5 phantom, 16-bit-addr hazard, latency as wire-truth) and NVM rollback pointers; x710 the >=30 ms EEPROM write pacing; fibergaga the empirical vendor-space finds; fs the inert-I2C-surface map; state.md stash section now empty

docs/README.md

@@ -5,9 +5,10 @@ Project knowledge that moves and versions with the repo.
 General:
 
 - [goals.md](goals.md) — what cabletest is for and what it must output.
-- [state.md](state.md) — where things are now: committed vs stashed, the box and what's in it, out-of-repo artifacts, every-boot steps. **All current-placement state lives here and only here.**
+- [state.md](state.md) — where things are now: the box and what's in it, out-of-repo artifacts, every-boot steps. **All current-placement state lives here and only here.**
 - [hardware.md](hardware.md) — host rules: interface conventions, tuning, how to run.
 - [measurement.md](measurement.md) — how to measure correctly; performance results and dead ends.
+- [xdp.md](xdp.md) — the AF_XDP datapath experiment: what it proved, what rebuilding it needs, why it can't run on the X520.
 - [open-questions.md](open-questions.md) — the genuinely open problems, as pointers into the docs that hold their detail.
 
 Per-device (each directory: device doc + its datasheets):