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Message-Id: <f6772b566eea20879d82b1a2015fc97b137a5f24.1588261997.git.mchehab+huawei@kernel.org>
Date: Thu, 30 Apr 2020 18:04:02 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Geoff Levand <geoff@...radead.org>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Ishizaki Kou <kou.ishizaki@...hiba.co.jp>,
netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 07/37] docs: networking: convert netconsole.txt to ReST
- add SPDX header;
- add a document title;
- mark code blocks and literals as such;
- mark tables as such;
- add notes markups;
- adjust identation, whitespaces and blank lines;
- add to networking/index.rst.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
.../admin-guide/kernel-parameters.txt | 2 +-
Documentation/admin-guide/serial-console.rst | 2 +-
Documentation/networking/index.rst | 1 +
.../{netconsole.txt => netconsole.rst} | 125 +++++++++++-------
drivers/net/Kconfig | 4 +-
drivers/net/ethernet/toshiba/ps3_gelic_net.c | 2 +-
drivers/net/ethernet/toshiba/spider_net.c | 2 +-
7 files changed, 84 insertions(+), 54 deletions(-)
rename Documentation/networking/{netconsole.txt => netconsole.rst} (66%)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 25644daa36ea..5a44c1bf85e7 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -638,7 +638,7 @@
See Documentation/admin-guide/serial-console.rst for more
information. See
- Documentation/networking/netconsole.txt for an
+ Documentation/networking/netconsole.rst for an
alternative.
uart[8250],io,<addr>[,options]
diff --git a/Documentation/admin-guide/serial-console.rst b/Documentation/admin-guide/serial-console.rst
index a8d1e36b627a..58b32832e50a 100644
--- a/Documentation/admin-guide/serial-console.rst
+++ b/Documentation/admin-guide/serial-console.rst
@@ -54,7 +54,7 @@ You will need to create a new device to use ``/dev/console``. The official
``/dev/console`` is now character device 5,1.
(You can also use a network device as a console. See
-``Documentation/networking/netconsole.txt`` for information on that.)
+``Documentation/networking/netconsole.rst`` for information on that.)
Here's an example that will use ``/dev/ttyS1`` (COM2) as the console.
Replace the sample values as needed.
diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index 492658bf7c0d..e58f872d401d 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -80,6 +80,7 @@ Contents:
mac80211-injection
mpls-sysctl
multiqueue
+ netconsole
.. only:: subproject and html
diff --git a/Documentation/networking/netconsole.txt b/Documentation/networking/netconsole.rst
similarity index 66%
rename from Documentation/networking/netconsole.txt
rename to Documentation/networking/netconsole.rst
index 296ea00fd3eb..1f5c4a04027c 100644
--- a/Documentation/networking/netconsole.txt
+++ b/Documentation/networking/netconsole.rst
@@ -1,7 +1,16 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========
+Netconsole
+==========
+
started by Ingo Molnar <mingo@...hat.com>, 2001.09.17
+
2.6 port and netpoll api by Matt Mackall <mpm@...enic.com>, Sep 9 2003
+
IPv6 support by Cong Wang <xiyou.wangcong@...il.com>, Jan 1 2013
+
Extended console support by Tejun Heo <tj@...nel.org>, May 1 2015
Please send bug reports to Matt Mackall <mpm@...enic.com>
@@ -23,34 +32,34 @@ Sender and receiver configuration:
==================================
It takes a string configuration parameter "netconsole" in the
-following format:
+following format::
netconsole=[+][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
where
- + if present, enable extended console support
- src-port source for UDP packets (defaults to 6665)
- src-ip source IP to use (interface address)
- dev network interface (eth0)
- tgt-port port for logging agent (6666)
- tgt-ip IP address for logging agent
- tgt-macaddr ethernet MAC address for logging agent (broadcast)
+ + if present, enable extended console support
+ src-port source for UDP packets (defaults to 6665)
+ src-ip source IP to use (interface address)
+ dev network interface (eth0)
+ tgt-port port for logging agent (6666)
+ tgt-ip IP address for logging agent
+ tgt-macaddr ethernet MAC address for logging agent (broadcast)
-Examples:
+Examples::
linux netconsole=4444@...0.0.1/eth1,9353@...0.0.2/12:34:56:78:9a:bc
- or
+or::
insmod netconsole netconsole=@/,@10.0.0.2/
- or using IPv6
+or using IPv6::
insmod netconsole netconsole=@/,@fd00:1:2:3::1/
It also supports logging to multiple remote agents by specifying
parameters for the multiple agents separated by semicolons and the
-complete string enclosed in "quotes", thusly:
+complete string enclosed in "quotes", thusly::
modprobe netconsole netconsole="@/,@10.0.0.2/;@/eth1,6892@...0.0.3/"
@@ -67,14 +76,19 @@ for example:
On distributions using a BSD-based netcat version (e.g. Fedora,
openSUSE and Ubuntu) the listening port must be specified without
- the -p switch:
+ the -p switch::
- 'nc -u -l -p <port>' / 'nc -u -l <port>' or
- 'netcat -u -l -p <port>' / 'netcat -u -l <port>'
+ nc -u -l -p <port>' / 'nc -u -l <port>
+
+ or::
+
+ netcat -u -l -p <port>' / 'netcat -u -l <port>
3) socat
- 'socat udp-recv:<port> -'
+::
+
+ socat udp-recv:<port> -
Dynamic reconfiguration:
========================
@@ -92,7 +106,7 @@ netconsole module (or kernel, if netconsole is built-in).
Some examples follow (where configfs is mounted at the /sys/kernel/config
mountpoint).
-To add a remote logging target (target names can be arbitrary):
+To add a remote logging target (target names can be arbitrary)::
cd /sys/kernel/config/netconsole/
mkdir target1
@@ -102,12 +116,13 @@ above) and are disabled by default -- they must first be enabled by writing
"1" to the "enabled" attribute (usually after setting parameters accordingly)
as described below.
-To remove a target:
+To remove a target::
rmdir /sys/kernel/config/netconsole/othertarget/
The interface exposes these parameters of a netconsole target to userspace:
+ ============== ================================= ============
enabled Is this target currently enabled? (read-write)
extended Extended mode enabled (read-write)
dev_name Local network interface name (read-write)
@@ -117,12 +132,13 @@ The interface exposes these parameters of a netconsole target to userspace:
remote_ip Remote agent's IP address (read-write)
local_mac Local interface's MAC address (read-only)
remote_mac Remote agent's MAC address (read-write)
+ ============== ================================= ============
The "enabled" attribute is also used to control whether the parameters of
a target can be updated or not -- you can modify the parameters of only
disabled targets (i.e. if "enabled" is 0).
-To update a target's parameters:
+To update a target's parameters::
cat enabled # check if enabled is 1
echo 0 > enabled # disable the target (if required)
@@ -140,12 +156,12 @@ Extended console:
If '+' is prefixed to the configuration line or "extended" config file
is set to 1, extended console support is enabled. An example boot
-param follows.
+param follows::
linux netconsole=+4444@...0.0.1/eth1,9353@...0.0.2/12:34:56:78:9a:bc
Log messages are transmitted with extended metadata header in the
-following format which is the same as /dev/kmsg.
+following format which is the same as /dev/kmsg::
<level>,<sequnum>,<timestamp>,<contflag>;<message text>
@@ -155,12 +171,12 @@ newline is used as the delimeter.
If a message doesn't fit in certain number of bytes (currently 1000),
the message is split into multiple fragments by netconsole. These
-fragments are transmitted with "ncfrag" header field added.
+fragments are transmitted with "ncfrag" header field added::
ncfrag=<byte-offset>/<total-bytes>
For example, assuming a lot smaller chunk size, a message "the first
-chunk, the 2nd chunk." may be split as follows.
+chunk, the 2nd chunk." may be split as follows::
6,416,1758426,-,ncfrag=0/31;the first chunk,
6,416,1758426,-,ncfrag=16/31; the 2nd chunk.
@@ -168,39 +184,52 @@ chunk, the 2nd chunk." may be split as follows.
Miscellaneous notes:
====================
-WARNING: the default target ethernet setting uses the broadcast
-ethernet address to send packets, which can cause increased load on
-other systems on the same ethernet segment.
+.. Warning::
-TIP: some LAN switches may be configured to suppress ethernet broadcasts
-so it is advised to explicitly specify the remote agents' MAC addresses
-from the config parameters passed to netconsole.
+ the default target ethernet setting uses the broadcast
+ ethernet address to send packets, which can cause increased load on
+ other systems on the same ethernet segment.
-TIP: to find out the MAC address of, say, 10.0.0.2, you may try using:
+.. Tip::
- ping -c 1 10.0.0.2 ; /sbin/arp -n | grep 10.0.0.2
+ some LAN switches may be configured to suppress ethernet broadcasts
+ so it is advised to explicitly specify the remote agents' MAC addresses
+ from the config parameters passed to netconsole.
-TIP: in case the remote logging agent is on a separate LAN subnet than
-the sender, it is suggested to try specifying the MAC address of the
-default gateway (you may use /sbin/route -n to find it out) as the
-remote MAC address instead.
+.. Tip::
-NOTE: the network device (eth1 in the above case) can run any kind
-of other network traffic, netconsole is not intrusive. Netconsole
-might cause slight delays in other traffic if the volume of kernel
-messages is high, but should have no other impact.
+ to find out the MAC address of, say, 10.0.0.2, you may try using::
-NOTE: if you find that the remote logging agent is not receiving or
-printing all messages from the sender, it is likely that you have set
-the "console_loglevel" parameter (on the sender) to only send high
-priority messages to the console. You can change this at runtime using:
+ ping -c 1 10.0.0.2 ; /sbin/arp -n | grep 10.0.0.2
- dmesg -n 8
+.. Tip::
-or by specifying "debug" on the kernel command line at boot, to send
-all kernel messages to the console. A specific value for this parameter
-can also be set using the "loglevel" kernel boot option. See the
-dmesg(8) man page and Documentation/admin-guide/kernel-parameters.rst for details.
+ in case the remote logging agent is on a separate LAN subnet than
+ the sender, it is suggested to try specifying the MAC address of the
+ default gateway (you may use /sbin/route -n to find it out) as the
+ remote MAC address instead.
+
+.. note::
+
+ the network device (eth1 in the above case) can run any kind
+ of other network traffic, netconsole is not intrusive. Netconsole
+ might cause slight delays in other traffic if the volume of kernel
+ messages is high, but should have no other impact.
+
+.. note::
+
+ if you find that the remote logging agent is not receiving or
+ printing all messages from the sender, it is likely that you have set
+ the "console_loglevel" parameter (on the sender) to only send high
+ priority messages to the console. You can change this at runtime using::
+
+ dmesg -n 8
+
+ or by specifying "debug" on the kernel command line at boot, to send
+ all kernel messages to the console. A specific value for this parameter
+ can also be set using the "loglevel" kernel boot option. See the
+ dmesg(8) man page and Documentation/admin-guide/kernel-parameters.rst
+ for details.
Netconsole was designed to be as instantaneous as possible, to
enable the logging of even the most critical kernel bugs. It works
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index c822f4a6d166..ad64be98330f 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -302,7 +302,7 @@ config NETCONSOLE
tristate "Network console logging support"
---help---
If you want to log kernel messages over the network, enable this.
- See <file:Documentation/networking/netconsole.txt> for details.
+ See <file:Documentation/networking/netconsole.rst> for details.
config NETCONSOLE_DYNAMIC
bool "Dynamic reconfiguration of logging targets"
@@ -312,7 +312,7 @@ config NETCONSOLE_DYNAMIC
This option enables the ability to dynamically reconfigure target
parameters (interface, IP addresses, port numbers, MAC addresses)
at runtime through a userspace interface exported using configfs.
- See <file:Documentation/networking/netconsole.txt> for details.
+ See <file:Documentation/networking/netconsole.rst> for details.
config NETPOLL
def_bool NETCONSOLE
diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
index 070dd6fa9401..310e6839c6e5 100644
--- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c
+++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
@@ -1150,7 +1150,7 @@ static irqreturn_t gelic_card_interrupt(int irq, void *ptr)
* gelic_net_poll_controller - artificial interrupt for netconsole etc.
* @netdev: interface device structure
*
- * see Documentation/networking/netconsole.txt
+ * see Documentation/networking/netconsole.rst
*/
void gelic_net_poll_controller(struct net_device *netdev)
{
diff --git a/drivers/net/ethernet/toshiba/spider_net.c b/drivers/net/ethernet/toshiba/spider_net.c
index 6576271642c1..3902b3aeb0c2 100644
--- a/drivers/net/ethernet/toshiba/spider_net.c
+++ b/drivers/net/ethernet/toshiba/spider_net.c
@@ -1615,7 +1615,7 @@ spider_net_interrupt(int irq, void *ptr)
* spider_net_poll_controller - artificial interrupt for netconsole etc.
* @netdev: interface device structure
*
- * see Documentation/networking/netconsole.txt
+ * see Documentation/networking/netconsole.rst
*/
static void
spider_net_poll_controller(struct net_device *netdev)
--
2.25.4
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