diff mbox series

[net-next,04/10] docs: bridge: Add kAPI/uAPI fields

Message ID 20231117093145.1563511-5-liuhangbin@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Doc: update bridge doc | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1134 this patch: 1134
netdev/cc_maintainers warning 3 maintainers not CCed: corbet@lwn.net linux-doc@vger.kernel.org bridge@lists.linux.dev
netdev/build_clang success Errors and warnings before: 1155 this patch: 1155
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1161 this patch: 1161
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 106 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 3 this patch: 1
netdev/source_inline success Was 0 now: 0

Commit Message

Hangbin Liu Nov. 17, 2023, 9:31 a.m. UTC 
The current bridge kernel doc is too old. It only pointed to the
linuxfoundation wiki page which lacks of the new features.

Here let's start the new bridge document and put all the bridge info
so new developers and users could catch up the last bridge status soon.

First, add kAPI/uAPI and FAQ fields. These 2 fields are only examples and
more APIs need to be added in future.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 Documentation/networking/bridge.rst | 84 +++++++++++++++++++++++++----
 net/bridge/br_private.h             |  2 +
 2 files changed, 76 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/Documentation/networking/bridge.rst b/Documentation/networking/bridge.rst
index c859f3c1636e..84aae94f6598 100644
--- a/Documentation/networking/bridge.rst
+++ b/Documentation/networking/bridge.rst
@@ -4,18 +4,82 @@ 
 Ethernet Bridging
 =================
 
-In order to use the Ethernet bridging functionality, you'll need the
-userspace tools.
+Introduction
+============
 
-Documentation for Linux bridging is on:
-   https://wiki.linuxfoundation.org/networking/bridge
+A bridge is a way to connect multiple Ethernet segments together in a protocol
+independent way. Packets are forwarded based on Layer 2 destination Ethernet
+address, rather than IP address (like a router). Since forwarding is done
+at Layer 2, all Layer 3 protocols can pass through a bridge transparently.
 
-The bridge-utilities are maintained at:
-   git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/bridge-utils.git
+Bridge kAPI
+===========
 
-Additionally, the iproute2 utilities can be used to configure
-bridge devices.
+Here are some core structures of bridge code.
 
-If you still have questions, don't hesitate to post to the mailing list 
-(more info https://lists.linux-foundation.org/mailman/listinfo/bridge).
+.. kernel-doc:: net/bridge/br_private.h
+   :identifiers: net_bridge_vlan
 
+Bridge uAPI
+===========
+
+Modern Linux bridge uAPI is accessed via Netlink interface. You can find
+below files where the bridge and bridge port netlink attributes are defined.
+
+Bridge netlink attributes
+-------------------------
+
+.. kernel-doc:: include/uapi/linux/if_link.h
+   :doc: Bridge enum definition
+
+Bridge port netlink attributes
+------------------------------
+
+.. kernel-doc:: include/uapi/linux/if_link.h
+   :doc: Bridge port enum definition
+
+Bridge sysfs
+------------
+
+All sysfs attributes are also exported via the bridge netlink API.
+You can find each attribute explanation based on the correspond netlink
+attribute.
+
+NOTE: the sysfs interface is deprecated and should not be extended if new
+options are added.
+
+.. kernel-doc:: net/bridge/br_sysfs_br.c
+   :doc: Bridge sysfs attributes
+
+FAQ
+===
+
+What does a bridge do?
+----------------------
+
+A bridge transparently forwards traffic between multiple network interfaces.
+In plain English this means that a bridge connects two or more physical
+Ethernet networks, to form one larger (logical) Ethernet network.
+
+Is it L3 protocol independent?
+------------------------------
+
+Yes. The bridge sees all frames, but it *uses* only L2 headers/information.
+As such, the bridging functionality is protocol independent, and there should
+be no trouble forwarding IPX, NetBEUI, IP, IPv6, etc.
+
+Contact Info
+============
+
+The code is currently maintained by Roopa Prabhu <roopa@nvidia.com> and
+Nikolay Aleksandrov <razor@blackwall.org>. Bridge bugs and enhancements
+are discussed on the linux-netdev mailing list netdev@vger.kernel.org and
+bridge@lists.linux-foundation.org.
+
+The list is open to anyone interested: http://vger.kernel.org/vger-lists.html#netdev
+
+External Links
+==============
+
+The old Documentation for Linux bridging is on:
+https://wiki.linuxfoundation.org/networking/bridge
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6b7f36769d03..051ea81864ac 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -186,6 +186,7 @@  enum {
  * struct net_bridge_vlan - per-vlan entry
  *
  * @vnode: rhashtable member
+ * @tnode: rhashtable member
  * @vid: VLAN id
  * @flags: bridge vlan flags
  * @priv_flags: private (in-kernel) bridge vlan flags
@@ -196,6 +197,7 @@  enum {
  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
  *          for this VLAN entry
+ * @tinfo: bridge tunnel info
  * @br_mcast_ctx: if MASTER flag set, this is the global vlan multicast context
  * @port_mcast_ctx: if MASTER flag unset, this is the per-port/vlan multicast
  *                  context