[PATCH v2] virtio-net: Define configuration field layout before its description

[Parav Pandit <parav@nvidia.com>]

Currently some fields of the virtio_net_config structure are defined
before introducing the structure and some are defined after
introducing virtio_net_config.
Better to define the configuration layout first followed by
description of all the fields.

Device configuration fields are described in the section. Change wording
from 'listed' to 'described' as suggested in patch [1].

While rewording the configuration layout, mention only one time that all
the fields of the configuration layout are read-only. Remove read-only
wording from individual fields.

[1] https://lists.oasis-open.org/archives/virtio-dev/202302/msg00004.html

Signed-off-by: Parav Pandit <parav@nvidia.com>
---
changelog:
v1->v2:
- remove read-only wording from multiple places
v0->v1:
- Change wording about device configuration field introduction
- remove duplicate read-only wording for status field
- reword sentence to read it better
---
 device-types/net/description.tex | 48 +++++++++++++++++---------------
 1 file changed, 26 insertions(+), 22 deletions(-)

diff --git a/device-types/net/description.tex b/device-types/net/description.tex
index bdf4810..719ebd4 100644
--- a/device-types/net/description.tex
+++ b/device-types/net/description.tex
@@ -156,26 +156,43 @@ \subsubsection{Legacy Interface: Feature bits}\label{sec:Device Types / Network
 \subsection{Device configuration layout}\label{sec:Device Types / Network Device / Device configuration layout}
 \label{sec:Device Types / Block Device / Feature bits / Device configuration layout}
 
-Device configuration fields are listed below, they are read-only for a driver. The \field{mac} address field
-always exists (though is only valid if VIRTIO_NET_F_MAC is set), and
-\field{status} only exists if VIRTIO_NET_F_STATUS is set. Two
-read-only bits (for the driver) are currently defined for the status field:
-VIRTIO_NET_S_LINK_UP and VIRTIO_NET_S_ANNOUNCE.
+The network device has the following device configuration layout.
+These device configuration fields are read-only for the driver.
+
+\begin{lstlisting}
+struct virtio_net_config {
+        u8 mac[6];
+        le16 status;
+        le16 max_virtqueue_pairs;
+        le16 mtu;
+        le32 speed;
+        u8 duplex;
+        u8 rss_max_key_size;
+        le16 rss_max_indirection_table_length;
+        le32 supported_hash_types;
+};
+\end{lstlisting}
+
+The \field{mac} address field always exists (although it is only
+valid if VIRTIO_NET_F_MAC is set).
+
+The \field{status} only exists if VIRTIO_NET_F_STATUS is set.
+Two bits are currently defined for the status field: VIRTIO_NET_S_LINK_UP
+and VIRTIO_NET_S_ANNOUNCE.
 
 \begin{lstlisting}
 #define VIRTIO_NET_S_LINK_UP     1
 #define VIRTIO_NET_S_ANNOUNCE    2
 \end{lstlisting}
 
-The following driver-read-only field, \field{max_virtqueue_pairs} only exists if
+The following field, \field{max_virtqueue_pairs} only exists if
 VIRTIO_NET_F_MQ or VIRTIO_NET_F_RSS is set. This field specifies the maximum number
 of each of transmit and receive virtqueues (receiveq1\ldots receiveqN
 and transmitq1\ldots transmitqN respectively) that can be configured once at least one of these features
 is negotiated.
 
-The following driver-read-only field, \field{mtu} only exists if
-VIRTIO_NET_F_MTU is set. This field specifies the maximum MTU for the driver to
-use.
+The following field, \field{mtu} only exists if VIRTIO_NET_F_MTU is set.
+This field specifies the maximum MTU for the driver to use.
 
 The following two fields, \field{speed} and \field{duplex}, only
 exist if VIRTIO_NET_F_SPEED_DUPLEX is set.
@@ -190,19 +207,6 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device
 is expected to re-read these values after receiving a
 configuration change notification.
 
-\begin{lstlisting}
-struct virtio_net_config {
-        u8 mac[6];
-        le16 status;
-        le16 max_virtqueue_pairs;
-        le16 mtu;
-        le32 speed;
-        u8 duplex;
-        u8 rss_max_key_size;
-        le16 rss_max_indirection_table_length;
-        le32 supported_hash_types;
-};
-\end{lstlisting}
 The following field, \field{rss_max_key_size} only exists if VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT is set.
 It specifies the maximum supported length of RSS key in bytes.
 
-- 
2.26.2