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Documentation: netconsole: add support for cmdline targets 

With the previous patches, there is no more limitation at modifying the
targets created at boot time (or module load time).

Document the way on how to create the configfs directories to be able to
modify these netconsole targets.

The design discussion about this topic could be found at:
https://lore.kernel.org/all/ZRWRal5bW93px4km@gmail.com/

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20231012111401.333798-5-leitao@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Breno Leitao 2023-10-12 04:14:01 -07:00 committed by Jakub Kicinski
parent 5fbd6cdbe3
commit 7eeb84d89f
1 changed files with 19 additions and 3 deletions
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22
Documentation/networking/netconsole.rst
View File

@ -99,9 +99,6 @@ Dynamic reconfiguration:
Dynamic reconfigurability is a useful addition to netconsole that enables
remote logging targets to be dynamically added, removed, or have their
parameters reconfigured at runtime from a configfs-based userspace interface.
[ Note that the parameters of netconsole targets that were specified/created
from the boot/module option are not exposed via this interface, and hence
cannot be modified dynamically. ]
To include this feature, select CONFIG_NETCONSOLE_DYNAMIC when building the
netconsole module (or kernel, if netconsole is built-in).
@ -155,6 +152,25 @@ You can also update the local interface dynamically. This is especially
useful if you want to use interfaces that have newly come up (and may not
have existed when netconsole was loaded / initialized).
Netconsole targets defined at boot time (or module load time) with the
`netconsole=` param are assigned the name `cmdline<index>`. For example, the
first target in the parameter is named `cmdline0`. You can control and modify
these targets by creating configfs directories with the matching name.
Let's suppose you have two netconsole targets defined at boot time::
netconsole=4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc;4444@10.0.0.1/eth1,9353@10.0.0.3/12:34:56:78:9a:bc
You can modify these targets in runtime by creating the following targets::
mkdir cmdline0
cat cmdline0/remote_ip
10.0.0.2
mkdir cmdline1
cat cmdline1/remote_ip
10.0.0.3
Extended console:
=================