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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

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flamingcow
2026-08-19 14:42:13 -07:00
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## Stashes
Indices shift as stashes are pushed/popped — match by message, not number.
- **"CX-5 Wiitek: MCIA transport…"** (currently `stash@{0}`) — the whole Wiitek-pair rewrite for the CX-5, kept as a parts bin: `phy_mcia.go` (VSC/ICMD MCIA transport), transport-interface `phy.go` (the same RollBall logic over either patched-ixgbe `sff_i2c` or MCIA), dual-end per-pair SNR from both modules (headline: worst pair across both ends), mlx5 ntuple steering + PHY RMON counters, test interfaces at MTU 9000 with a 9018-byte jumbo in the size mix; BCM/ECD/length dropped. Technical record: nics/connectx-5/. Carries live debug instrumentation and `rbCmdPoll` lowered to 2 ms from the mailbox-latency investigation — **not shippable as-is**, clean it before committing — plus the pre-existing uncommitted `ui.go`/`ui_test.go` edits that were entangled in the same files.
- **"AF_XDP both directions…"** (currently `stash@{1}`) — AF_XDP conversion (hand-rolled XSK + XDP program, per-frame MAC-stamp buckets via rx metadata). Built for the E810-era datapath. An experiment, not a requirement.
- **"phydiag campaign…"** (currently `stash@{2}`) — python transport clients (`i40e_aq.py`, `rollball_i40e.py`, `sff.py`), scanners, campaign log. Working copies live in `~/work/phydiag-work/`; the knowledge is in these docs; the code should eventually move into the repo properly.
None. Every parked experiment is distilled into docs and its code dropped: the AF_XDP conversion in xdp.md, the CX-5 Wiitek-pair implementation in nics/connectx-5/ (including the MCIA gateway constants), the phydiag campaign across nics/e810/, nics/x710/, modules/fs/ and modules/fibergaga/. Remaining phydiag working copies: `~/work/phydiag-work/` (below).
## The box
@@ -30,7 +26,7 @@ Indices shift as stashes are pushed/popped — match by message, not number.
| Item | Status | Notes |
|---|---|---|
| X520-DA2 | **Installed** in the single PCIe slot — **the product NIC** (nics/x520/) | Unmediated bit-bang I2C (patched-ixgbe `sff_i2c`), <25 ms RollBall, FS links and the ECD length path is proven; the smoothed-bucket rate design removes the need for hardware RX stamps |
| ConnectX-5 | Out of the box — retired | Ran the two-Wiitek pair at near line rate with dual-end SNR (stashed `phy_mcia.go` MCIA transport), but the firmware quantizes every module mailbox read to ~150 ms steps and the FS never links behind mlx5 — nics/connectx-5/, "Status" |
| ConnectX-5 | Out of the box — retired | Ran the two-Wiitek pair at near line rate with dual-end SNR (MCIA transport, recorded with its gateway constants in nics/connectx-5/), but the firmware quantizes every module mailbox read to ~150 ms steps and the FS never links behind mlx5 — nics/connectx-5/, "Status" |
| FS SFP-10G-T-100 ×2 | One in the X520 test pair, one on the shelf | BCM84891L, documented, robust; ixgbe-only (unlinkable behind mlx5 — host-interface deadlock, confirmed module-typed, nics/connectx-5/ — and rejected by the X710). The FS+Wiitek mixed pair (FS length via ECD + Wiitek SNR) is the product configuration |
| Replacement Wiiteks | One in the X520 test pair, two seated in the unused X710, rest on the shelf | Originals bricked by register exploration — modules/wiitek/ trap first. IEEE-standard registers only (modules/README.md safe set); VCT templates are single-shot candidates on a sacrificial unit only |
| Fibergaga SFP-10G-T-30M | On the shelf | Aquantia, RollBall, the documented oracle; the alternate length path if the pair mix ever changes |