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+.. 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;
+ ...
+ };
+
+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;
+
+ 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::
+
+ 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
+was called.
+
+
+Locking:
+--------
+
+Locks are taken before writing and released once all statistics have
+been written. Locks are always released in case of an error. You
+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.
+ As usual, such a TLV needs to be 32 bit aligned and therefore the
+ length needs to be appropriately set, etc. The estimator interval
+ and ewma log need to be converted to the appropriate values.
+ tc_estimator.c::tc_setup_estimator() is advisable to be used as the
+ conversion routine. It does a few clever things. It takes a time
+ interval in microsecs, a time constant also in microsecs and a struct
+ tc_estimator to be populated. The returned tc_estimator can be
+ transported to the kernel. Transfer such a structure in a TLV of type
+ 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::
+
+ int ret = gen_new_estimator(my_basicstats,my_rate_est_stats,
+ mystats_lock, attr_with_tcestimator_struct);
+
+ if ret == 0
+ success
+ else
+ failed
+
+From now on, every time you dump my_rate_est_stats it will contain
+up-to-date info.
+
+Once you are done, call gen_kill_estimator(my_basicstats,
+my_rate_est_stats) Make sure that my_basicstats and my_rate_est_stats
+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>