forked from luck/tmp_suning_uos_patched
docs: networking: convert gen_stats.txt to ReST
- add SPDX header; - mark code blocks and literals as such; - mark tables as such; - mark lists as such; - adjust identation, whitespaces and blank lines; - add to networking/index.rst. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mauro Carvalho Chehab
David S. Miller
parent
110662503d
commit
8c49893558
|
|
@ -1,67 +1,76 @@
|
|||
.. SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
===============================================
|
||||
Generic networking statistics for netlink users
|
||||
======================================================================
|
||||
===============================================
|
||||
|
||||
Statistic counters are grouped into structs:
|
||||
|
||||
==================== ===================== =====================
|
||||
Struct TLV type Description
|
||||
----------------------------------------------------------------------
|
||||
==================== ===================== =====================
|
||||
gnet_stats_basic TCA_STATS_BASIC Basic statistics
|
||||
gnet_stats_rate_est TCA_STATS_RATE_EST Rate estimator
|
||||
gnet_stats_queue TCA_STATS_QUEUE Queue statistics
|
||||
none TCA_STATS_APP Application specific
|
||||
==================== ===================== =====================
|
||||
|
||||
|
||||
Collecting:
|
||||
-----------
|
||||
|
||||
Declare the statistic structs you need:
|
||||
struct mystruct {
|
||||
struct gnet_stats_basic bstats;
|
||||
struct gnet_stats_queue qstats;
|
||||
...
|
||||
};
|
||||
Declare the statistic structs you need::
|
||||
|
||||
Update statistics, in dequeue() methods only, (while owning qdisc->running)
|
||||
mystruct->tstats.packet++;
|
||||
mystruct->qstats.backlog += skb->pkt_len;
|
||||
struct mystruct {
|
||||
struct gnet_stats_basic bstats;
|
||||
struct gnet_stats_queue qstats;
|
||||
...
|
||||
};
|
||||
|
||||
Update statistics, in dequeue() methods only, (while owning qdisc->running)::
|
||||
|
||||
mystruct->tstats.packet++;
|
||||
mystruct->qstats.backlog += skb->pkt_len;
|
||||
|
||||
|
||||
Export to userspace (Dump):
|
||||
---------------------------
|
||||
|
||||
my_dumping_routine(struct sk_buff *skb, ...)
|
||||
{
|
||||
struct gnet_dump dump;
|
||||
::
|
||||
|
||||
if (gnet_stats_start_copy(skb, TCA_STATS2, &mystruct->lock, &dump,
|
||||
TCA_PAD) < 0)
|
||||
goto rtattr_failure;
|
||||
my_dumping_routine(struct sk_buff *skb, ...)
|
||||
{
|
||||
struct gnet_dump dump;
|
||||
|
||||
if (gnet_stats_copy_basic(&dump, &mystruct->bstats) < 0 ||
|
||||
gnet_stats_copy_queue(&dump, &mystruct->qstats) < 0 ||
|
||||
gnet_stats_copy_app(&dump, &xstats, sizeof(xstats)) < 0)
|
||||
goto rtattr_failure;
|
||||
if (gnet_stats_start_copy(skb, TCA_STATS2, &mystruct->lock, &dump,
|
||||
TCA_PAD) < 0)
|
||||
goto rtattr_failure;
|
||||
|
||||
if (gnet_stats_finish_copy(&dump) < 0)
|
||||
goto rtattr_failure;
|
||||
...
|
||||
}
|
||||
if (gnet_stats_copy_basic(&dump, &mystruct->bstats) < 0 ||
|
||||
gnet_stats_copy_queue(&dump, &mystruct->qstats) < 0 ||
|
||||
gnet_stats_copy_app(&dump, &xstats, sizeof(xstats)) < 0)
|
||||
goto rtattr_failure;
|
||||
|
||||
if (gnet_stats_finish_copy(&dump) < 0)
|
||||
goto rtattr_failure;
|
||||
...
|
||||
}
|
||||
|
||||
TCA_STATS/TCA_XSTATS backward compatibility:
|
||||
--------------------------------------------
|
||||
|
||||
Prior users of struct tc_stats and xstats can maintain backward
|
||||
compatibility by calling the compat wrappers to keep providing the
|
||||
existing TLV types.
|
||||
existing TLV types::
|
||||
|
||||
my_dumping_routine(struct sk_buff *skb, ...)
|
||||
{
|
||||
if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
|
||||
TCA_XSTATS, &mystruct->lock, &dump,
|
||||
TCA_PAD) < 0)
|
||||
goto rtattr_failure;
|
||||
...
|
||||
}
|
||||
my_dumping_routine(struct sk_buff *skb, ...)
|
||||
{
|
||||
if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
|
||||
TCA_XSTATS, &mystruct->lock, &dump,
|
||||
TCA_PAD) < 0)
|
||||
goto rtattr_failure;
|
||||
...
|
||||
}
|
||||
|
||||
A struct tc_stats will be filled out during gnet_stats_copy_* calls
|
||||
and appended to the skb. TCA_XSTATS is provided if gnet_stats_copy_app
|
||||
|
|
@ -77,7 +86,7 @@ are responsible for making sure that the lock is initialized.
|
|||
|
||||
|
||||
Rate Estimator:
|
||||
--------------
|
||||
---------------
|
||||
|
||||
0) Prepare an estimator attribute. Most likely this would be in user
|
||||
space. The value of this TLV should contain a tc_estimator structure.
|
||||
|
|
@ -92,18 +101,19 @@ Rate Estimator:
|
|||
TCA_RATE to your code in the kernel.
|
||||
|
||||
In the kernel when setting up:
|
||||
|
||||
1) make sure you have basic stats and rate stats setup first.
|
||||
2) make sure you have initialized stats lock that is used to setup such
|
||||
stats.
|
||||
3) Now initialize a new estimator:
|
||||
3) Now initialize a new estimator::
|
||||
|
||||
int ret = gen_new_estimator(my_basicstats,my_rate_est_stats,
|
||||
mystats_lock, attr_with_tcestimator_struct);
|
||||
int ret = gen_new_estimator(my_basicstats,my_rate_est_stats,
|
||||
mystats_lock, attr_with_tcestimator_struct);
|
||||
|
||||
if ret == 0
|
||||
success
|
||||
else
|
||||
failed
|
||||
if ret == 0
|
||||
success
|
||||
else
|
||||
failed
|
||||
|
||||
From now on, every time you dump my_rate_est_stats it will contain
|
||||
up-to-date info.
|
||||
|
|
@ -115,5 +125,5 @@ are still valid (i.e still exist) at the time of making this call.
|
|||
|
||||
Authors:
|
||||
--------
|
||||
Thomas Graf <tgraf@suug.ch>
|
||||
Jamal Hadi Salim <hadi@cyberus.ca>
|
||||
- Thomas Graf <tgraf@suug.ch>
|
||||
- Jamal Hadi Salim <hadi@cyberus.ca>
|
||||
|
|
@ -61,6 +61,7 @@ Contents:
|
|||
framerelay
|
||||
generic-hdlc
|
||||
generic_netlink
|
||||
gen_stats
|
||||
|
||||
.. only:: subproject and html
|
||||
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
* Jamal Hadi Salim
|
||||
* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
||||
*
|
||||
* See Documentation/networking/gen_stats.txt
|
||||
* See Documentation/networking/gen_stats.rst
|
||||
*/
|
||||
|
||||
#include <linux/types.h>
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user