[RFC PATCH 1/2] UHR-ELR: add a new field

UHR adds a completely different PPDU type, UHR enhanced long range
(ELR) PPDUs. These are very much limited, with just two MCSes, one
spatial stream, 20 MHz only, etc. It's much easier to suppor them
in a separate, limited, UHR-ELR field than trying to put it into a
single field with other UHR PPDUs.

Add the UHR-ELR field for these PPDUs, other UHR PPDUs will be in
a different UHR field.
---
 fields/UHR-ELR.md | 78 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 fields/UHR-ELR.md

diff --git a/fields/UHR-ELR.md b/fields/UHR-ELR.md
new file mode 100644
index 000000000000..0dfe6363e932
--- /dev/null
+++ b/fields/UHR-ELR.md
@@ -0,0 +1,78 @@
+---
+title: UHR-ELR
+categories: [suggested]
+type: 35
+---
+Type
+: 35
+
+Structure
+: - u32 known
+  - u32 sig1, sig2, mark
+
+Required Alignment
+: 4
+
+Unit(s)
+: none
+
+This field represents (data taken from) the ELR preamble for a UHR
+ELR (enhanced long range) PPDU. Such PPDUs are always transmitted
+with a single spatial stream and on a 20 MHz channel.
+
+## known
+
+| **bits**         | **meaning** |
+| **`0x00000001`** | ELR Version Identifier Known |
+| **`0x00000002`** | UL/DL Known |
+| **`0x00000004`** | MCS Known |
+| **`0x00000008`** | Coding Known |
+| **`0x00000010`** | Length Known |
+| **`0x00000020`** | LDPC Extra OFDM Symbol Known |
+| **`0x00000040`** | ELR-SIG-1 CRC Known |
+| **`0x00000080`** | ELR-SIG-1 Tail Known |
+| **`0x00000100`** | STA-ID Known |
+| **`0x00000200`** | Disregard Known |
+| **`0x00000400`** | ELR-SIG-2 CRC Known |
+| **`0x00000800`** | ELR-SIG-2 Tail Known |
+| **`0x00001000`** | ELR-SIG-1 CRC Checked |
+| **`0x00002000`** | ELR-SIG-2 CRC Checked |
+| **`0x0000C000`** | (reserved) |
+| **`0x00010000`** | ELR-MARK BSS Color Known |
+| **`0xFFFE0000`** | (reserved) |
+
+## sig1
+
+Represents data from ELR-SIG-1, subject to availability (`known` flags)
+
+| **bits**         | **meaning** |
+| **`0x00000001`** | ELR Version Identifier |
+| **`0x00000002`** | UL/DL |
+| **`0x00000004`** | MCS |
+| **`0x00000008`** | Coding |
+| **`0x00001FF0`** | Length |
+| **`0x00002000`** | LDPC Extra OFDM Symbol |
+| **`0x0003C000`** | CRC |
+| **`0x00FC0000`** | Tail |
+| **`0x7F000000`** | (reserved) |
+| **`0x80000000`** | CRC valid (if checked) |
+
+## sig2
+
+Represents data from ELR-SIG-2, subject to availability (`known` flags)
+
+| **bits**         | **meaning** |
+| **`0x000007FF`** | STA-ID |
+| **`0x00003800`** | Disregard |
+| **`0x0003C000`** | CRC |
+| **`0x00FC0000`** | Tail |
+| **`0x7F000000`** | (reserved) |
+| **`0x80000000`** | CRC valid (if checked) |
+
+## mark
+
+Represents data from ELR-MARK, subject to availability (`known` flags)
+
+| **bits**         | **meaning** |
+| **`0x0000003F`** | BSS Color |
+| **`0xFFFFFFC0`** | (reserved) |
-- 
2.51.0