docs: networking: convert multiqueue.txt to ReST

- add SPDX header;
- adjust titles and chapters, adding proper markups;
- mark code blocks and literals as such;
- use :field: markup;
- adjust identation, whitespaces and blank lines;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/bonding.rst

···
 using the traffic control utilities inherent in linux.
 
 By default the bonding driver is multiqueue aware and 16 queues are created
-when the driver initializes (see Documentation/networking/multiqueue.txt
+when the driver initializes (see Documentation/networking/multiqueue.rst
 for details).  If more or less queues are desired the module parameter
 tx_queues can be used to change this value.  There is no sysfs parameter
 available as the allocation is done at module init time.

Documentation/networking/index.rst

···
    ltpc
    mac80211-injection
    mpls-sysctl
+   multiqueue
 
 .. only::  subproject and html
 

Documentation/networking/multiqueue.txt Documentation/networking/multiqueue.rst

···
+.. SPDX-License-Identifier: GPL-2.0
 
-		HOWTO for multiqueue network device support
-		===========================================
+===========================================
+HOWTO for multiqueue network device support
+===========================================
 
 Section 1: Base driver requirements for implementing multiqueue support
+=======================================================================
 
 Intro: Kernel support for multiqueue devices
 ---------------------------------------------------------
 
 Kernel support for multiqueue devices is always present.
-
-Section 1: Base driver requirements for implementing multiqueue support
------------------------------------------------------------------------
 
 Base drivers are required to use the new alloc_etherdev_mq() or
 alloc_netdev_mq() functions to allocate the subqueues for the device.  The
···
 
 
 Section 2: Qdisc support for multiqueue devices
-
------------------------------------------------
+===============================================
 
 Currently two qdiscs are optimized for multiqueue devices.  The first is the
 default pfifo_fast qdisc.  This qdisc supports one qdisc per hardware queue.
···
 
 
 Section 3: Brief howto using MULTIQ for multiqueue devices
----------------------------------------------------------------
+==========================================================
 
 The userspace command 'tc,' part of the iproute2 package, is used to configure
 qdiscs.  To add the MULTIQ qdisc to your network device, assuming the device
-is called eth0, run the following command:
+is called eth0, run the following command::
 
-# tc qdisc add dev eth0 root handle 1: multiq
+    # tc qdisc add dev eth0 root handle 1: multiq
 
 The qdisc will allocate the number of bands to equal the number of queues that
 the device reports, and bring the qdisc online.  Assuming eth0 has 4 Tx
-queues, the band mapping would look like:
+queues, the band mapping would look like::
 
-band 0 => queue 0
-band 1 => queue 1
-band 2 => queue 2
-band 3 => queue 3
+    band 0 => queue 0
+    band 1 => queue 1
+    band 2 => queue 2
+    band 3 => queue 3
 
 Traffic will begin flowing through each queue based on either the simple_tx_hash
 function or based on netdev->select_queue() if you have it defined.
···
 The behavior of tc filters remains the same.  However a new tc action,
 skbedit, has been added.  Assuming you wanted to route all traffic to a
 specific host, for example 192.168.0.3, through a specific queue you could use
-this action and establish a filter such as:
+this action and establish a filter such as::
 
-tc filter add dev eth0 parent 1: protocol ip prio 1 u32 \
-	match ip dst 192.168.0.3 \
-	action skbedit queue_mapping 3
+    tc filter add dev eth0 parent 1: protocol ip prio 1 u32 \
+	    match ip dst 192.168.0.3 \
+	    action skbedit queue_mapping 3
 
-Author: Alexander Duyck <[e-mail]>
-Original Author: Peter P. Waskiewicz Jr. <[e-mail]>
+:Author: Alexander Duyck <[e-mail]>
+:Original Author: Peter P. Waskiewicz Jr. <[e-mail]>