docs: networking: device drivers: convert qualcomm/rmnet.txt to ReST

- add SPDX header;
- add a document title;
- mark code blocks and literals as such;
- mark tables as such;
- adjust identation, whitespaces and blank lines where needed;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/device_drivers/index.rst

@@ -44,6 +44,7 @@ Contents:
    microsoft/netvsc
    neterion/s2io
    neterion/vxge
+   qualcomm/rmnet
 
 .. only::  subproject and html
 

Documentation/networking/device_drivers/qualcomm/rmnet.rst

@@ -1,4 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============
+Rmnet Driver
+============
+
 1. Introduction
+===============
 
 rmnet driver is used for supporting the Multiplexing and aggregation
 Protocol (MAP). This protocol is used by all recent chipsets using Qualcomm
@@ -18,17 +25,18 @@ sending aggregated bunch of MAP frames. rmnet driver will de-aggregate
 these MAP frames and send them to appropriate PDN's.
 
 2. Packet format
+================
 
 a. MAP packet (data / control)
 
 MAP header has the same endianness of the IP packet.
 
-Packet format -
+Packet format::
 
-Bit             0             1           2-7      8 - 15           16 - 31
-Function   Command / Data   Reserved     Pad   Multiplexer ID    Payload length
-Bit            32 - x
-Function     Raw  Bytes
+  Bit             0             1           2-7      8 - 15           16 - 31
+  Function   Command / Data   Reserved     Pad   Multiplexer ID    Payload length
+  Bit            32 - x
+  Function     Raw  Bytes
 
 Command (1)/ Data (0) bit value is to indicate if the packet is a MAP command
 or data packet. Control packet is used for transport level flow control. Data
@@ -44,24 +52,27 @@ Multiplexer ID is to indicate the PDN on which data has to be sent.
 Payload length includes the padding length but does not include MAP header
 length.
 
-b. MAP packet (command specific)
+b. MAP packet (command specific)::
 
-Bit             0             1           2-7      8 - 15           16 - 31
-Function   Command         Reserved     Pad   Multiplexer ID    Payload length
-Bit          32 - 39        40 - 45    46 - 47       48 - 63
-Function   Command name    Reserved   Command Type   Reserved
-Bit          64 - 95
-Function   Transaction ID
-Bit          96 - 127
-Function   Command data
+    Bit             0             1           2-7      8 - 15           16 - 31
+    Function   Command         Reserved     Pad   Multiplexer ID    Payload length
+    Bit          32 - 39        40 - 45    46 - 47       48 - 63
+    Function   Command name    Reserved   Command Type   Reserved
+    Bit          64 - 95
+    Function   Transaction ID
+    Bit          96 - 127
+    Function   Command data
 
 Command 1 indicates disabling flow while 2 is enabling flow
 
-Command types -
+Command types
+
+= ==========================================
 0 for MAP command request
 1 is to acknowledge the receipt of a command
 2 is for unsupported commands
 3 is for error during processing of commands
+= ==========================================
 
 c. Aggregation
 
@@ -71,9 +82,11 @@ packets and either ACK the MAP command or deliver the IP packet to the
 network stack as needed
 
 MAP header|IP Packet|Optional padding|MAP header|IP Packet|Optional padding....
+
 MAP header|IP Packet|Optional padding|MAP header|Command Packet|Optional pad...
 
 3. Userspace configuration
+==========================
 
 rmnet userspace configuration is done through netlink library librmnetctl
 and command line utility rmnetcli. Utility is hosted in codeaurora forum git.

MAINTAINERS

@@ -14031,7 +14031,7 @@ M:	Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
 M:	Sean Tranchetti <stranche@codeaurora.org>
 L:	netdev@vger.kernel.org
 S:	Maintained
-F:	Documentation/networking/device_drivers/qualcomm/rmnet.txt
+F:	Documentation/networking/device_drivers/qualcomm/rmnet.rst
 F:	drivers/net/ethernet/qualcomm/rmnet/
 F:	include/linux/if_rmnet.h