netdev - [PATCH iproute2 5/6] man8/bridge.8: explain self vs master for "bridge fdb add"

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Date:   Thu, 11 Feb 2021 12:45:01 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     David Ahern <dsahern@...il.com>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        DENG Qingfang <dqfext@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH iproute2 5/6] man8/bridge.8: explain self vs master for "bridge fdb add"

From: Vladimir Oltean <vladimir.oltean@....com>

The "usually hardware" and "usually software" distinctions make no
sense, try to clarify what these do based on the actual kernel behavior.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 man/man8/bridge.8 | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index 1dc0aec83f09..d0bcd708bb61 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -533,12 +533,21 @@ specified.
 .sp
 
 .B self
-- the address is associated with the port drivers fdb. Usually hardware
-  (default).
+- the operation is fulfilled directly by the driver for the specified network
+device. If the network device belongs to a master like a bridge, then the
+bridge is bypassed and not notified of this operation (and if the device does
+notify the bridge, it is driver-specific behavior and not mandated by this
+flag, check the driver for more details). The "bridge fdb add" command can also
+be used on the bridge device itself, and in this case, the added fdb entries
+will be locally terminated (not forwarded). In the latter case, the "self" flag
+is mandatory. The flag is set by default if "master" is not specified.
 .sp
 
 .B master
-- the address is associated with master devices fdb. Usually software.
+- if the specified network device is a port that belongs to a master device
+such as a bridge, the operation is fulfilled by the master device's driver,
+which may in turn notify the port driver too of the address. If the specified
+device is a master itself, such as a bridge, this flag is invalid.
 .sp
 
 .B router
-- 
2.25.1