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Resolve X520 open questions on hardware: ETQF raw-L2 steering and single-hold compound I2C proven; 82599 has no all-packet exact-timestamp path so it is disqualified as product NIC (diagnostics-only), counter route rejected for a cable tester

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flamingcow
2026-08-12 20:36:31 -07:00
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docs/nics/README.md
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@@ -12,7 +12,7 @@ Which card is where: [../state.md](../state.md).
| NIC (driver) | Module I2C | All-packet RX hw stamps | Verdict |
|---|---|---|---|
| [X520 / 82599 (ixgbe)](x520/README.md) | Host bit-bangs — full control, **proven** | No (PTP-only) | The certain diagnostics transport; product-capable only if the bucket exploration validates |
| [X520 / 82599 (ixgbe)](x520/README.md) | Host bit-bangs — full control, **proven** | No (PTP-only, serial latch) | Diagnostics transport only — no all-packet exact stamps, so disqualified as product NIC (§2) |
| [ConnectX-4/5 (mlx5)](connectx-5/README.md) | Firmware MCIA; writes allowed; framing open | **Yes** (CQE-stamps everything) | **The product candidate** — the only card meeting the full requirement set |
| [X710 (i40e)](x710/README.md) | 1-byte-offset only | No | RollBall oracle path; PTP length-experiment platform |
| [E810 (ice)](e810/README.md) | Multi-byte framing, writes EPERM-blocked | Yes | Dead for diagnostics writes |