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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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net/mlx5_core: Flow counters infrastructure
If a counter has the aging flag set when created, it is added to a list of counters that will be queried periodically from a workqueue. query result and last use timestamp are cached. add/del counter must be very efficient since thousands of such operations might be issued in a second. There is only a single reference to counters without aging, therefore no need for locks. But, counters with aging enabled are stored in a list. In order to make code as lockless as possible, all the list manipulation and access to hardware is done from a single context - the periodic counters query thread. The hardware supports multiple counters per FTE, however currently we are using one counter for each FTE. Signed-off-by: Amir Vadai <amirva@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
bd5251dbf1
commit
43a335e055
@ -2,7 +2,7 @@ obj-$(CONFIG_MLX5_CORE) += mlx5_core.o
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mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
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health.o mcg.o cq.o srq.o alloc.o qp.o port.o mr.o pd.o \
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mad.o transobj.o vport.o sriov.o fs_cmd.o fs_core.o
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mad.o transobj.o vport.o sriov.o fs_cmd.o fs_core.o fs_counters.o
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mlx5_core-$(CONFIG_MLX5_CORE_EN) += wq.o eswitch.o \
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en_main.o en_fs.o en_ethtool.o en_tx.o en_rx.o \
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@ -1771,6 +1771,7 @@ void mlx5_cleanup_fs(struct mlx5_core_dev *dev)
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cleanup_single_prio_root_ns(dev, dev->priv.fdb_root_ns);
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cleanup_single_prio_root_ns(dev, dev->priv.esw_egress_root_ns);
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cleanup_single_prio_root_ns(dev, dev->priv.esw_ingress_root_ns);
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mlx5_cleanup_fc_stats(dev);
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}
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static int init_fdb_root_ns(struct mlx5_core_dev *dev)
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@ -1827,10 +1828,14 @@ int mlx5_init_fs(struct mlx5_core_dev *dev)
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{
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int err = 0;
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err = mlx5_init_fc_stats(dev);
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if (err)
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return err;
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if (MLX5_CAP_GEN(dev, nic_flow_table)) {
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err = init_root_ns(dev);
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if (err)
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return err;
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goto err;
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}
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if (MLX5_CAP_GEN(dev, eswitch_flow_table)) {
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err = init_fdb_root_ns(dev);
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@ -169,6 +169,9 @@ struct mlx5_flow_root_namespace {
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struct mutex chain_lock;
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};
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int mlx5_init_fc_stats(struct mlx5_core_dev *dev);
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void mlx5_cleanup_fc_stats(struct mlx5_core_dev *dev);
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int mlx5_init_fs(struct mlx5_core_dev *dev);
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void mlx5_cleanup_fs(struct mlx5_core_dev *dev);
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226
drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
Normal file
226
drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
Normal file
@ -0,0 +1,226 @@
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/*
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* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/mlx5/driver.h>
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#include <linux/mlx5/fs.h>
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#include "mlx5_core.h"
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#include "fs_core.h"
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#include "fs_cmd.h"
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#define MLX5_FC_STATS_PERIOD msecs_to_jiffies(1000)
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/* locking scheme:
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*
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* It is the responsibility of the user to prevent concurrent calls or bad
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* ordering to mlx5_fc_create(), mlx5_fc_destroy() and accessing a reference
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* to struct mlx5_fc.
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* e.g en_tc.c is protected by RTNL lock of its caller, and will never call a
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* dump (access to struct mlx5_fc) after a counter is destroyed.
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*
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* access to counter list:
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* - create (user context)
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* - mlx5_fc_create() only adds to an addlist to be used by
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* mlx5_fc_stats_query_work(). addlist is protected by a spinlock.
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* - spawn thread to do the actual destroy
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*
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* - destroy (user context)
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* - mark a counter as deleted
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* - spawn thread to do the actual del
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*
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* - dump (user context)
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* user should not call dump after destroy
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*
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* - query (single thread workqueue context)
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* destroy/dump - no conflict (see destroy)
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* query/dump - packets and bytes might be inconsistent (since update is not
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* atomic)
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* query/create - no conflict (see create)
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* since every create/destroy spawn the work, only after necessary time has
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* elapsed, the thread will actually query the hardware.
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*/
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static void mlx5_fc_stats_work(struct work_struct *work)
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{
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struct mlx5_core_dev *dev = container_of(work, struct mlx5_core_dev,
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priv.fc_stats.work.work);
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struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
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unsigned long now = jiffies;
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struct mlx5_fc *counter;
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struct mlx5_fc *tmp;
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int err = 0;
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spin_lock(&fc_stats->addlist_lock);
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list_splice_tail_init(&fc_stats->addlist, &fc_stats->list);
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if (!list_empty(&fc_stats->list))
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queue_delayed_work(fc_stats->wq, &fc_stats->work, MLX5_FC_STATS_PERIOD);
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spin_unlock(&fc_stats->addlist_lock);
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list_for_each_entry_safe(counter, tmp, &fc_stats->list, list) {
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struct mlx5_fc_cache *c = &counter->cache;
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u64 packets;
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u64 bytes;
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if (counter->deleted) {
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list_del(&counter->list);
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mlx5_cmd_fc_free(dev, counter->id);
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kfree(counter);
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continue;
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}
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if (time_before(now, fc_stats->next_query))
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continue;
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err = mlx5_cmd_fc_query(dev, counter->id, &packets, &bytes);
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if (err) {
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pr_err("Error querying stats for counter id %d\n",
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counter->id);
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continue;
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}
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if (packets == c->packets)
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continue;
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c->lastuse = jiffies;
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c->packets = packets;
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c->bytes = bytes;
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}
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if (time_after_eq(now, fc_stats->next_query))
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fc_stats->next_query = now + MLX5_FC_STATS_PERIOD;
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}
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struct mlx5_fc *mlx5_fc_create(struct mlx5_core_dev *dev, bool aging)
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{
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struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
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struct mlx5_fc *counter;
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int err;
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counter = kzalloc(sizeof(*counter), GFP_KERNEL);
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if (!counter)
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return ERR_PTR(-ENOMEM);
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err = mlx5_cmd_fc_alloc(dev, &counter->id);
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if (err)
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goto err_out;
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if (aging) {
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counter->aging = true;
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spin_lock(&fc_stats->addlist_lock);
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list_add(&counter->list, &fc_stats->addlist);
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spin_unlock(&fc_stats->addlist_lock);
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mod_delayed_work(fc_stats->wq, &fc_stats->work, 0);
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}
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return counter;
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err_out:
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kfree(counter);
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return ERR_PTR(err);
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}
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void mlx5_fc_destroy(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
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{
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struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
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if (!counter)
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return;
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if (counter->aging) {
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counter->deleted = true;
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mod_delayed_work(fc_stats->wq, &fc_stats->work, 0);
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return;
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}
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mlx5_cmd_fc_free(dev, counter->id);
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kfree(counter);
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}
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int mlx5_init_fc_stats(struct mlx5_core_dev *dev)
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{
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struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
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INIT_LIST_HEAD(&fc_stats->list);
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INIT_LIST_HEAD(&fc_stats->addlist);
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spin_lock_init(&fc_stats->addlist_lock);
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fc_stats->wq = create_singlethread_workqueue("mlx5_fc");
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if (!fc_stats->wq)
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return -ENOMEM;
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INIT_DELAYED_WORK(&fc_stats->work, mlx5_fc_stats_work);
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return 0;
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}
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void mlx5_cleanup_fc_stats(struct mlx5_core_dev *dev)
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{
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struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
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struct mlx5_fc *counter;
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struct mlx5_fc *tmp;
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cancel_delayed_work_sync(&dev->priv.fc_stats.work);
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destroy_workqueue(dev->priv.fc_stats.wq);
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dev->priv.fc_stats.wq = NULL;
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list_splice_tail_init(&fc_stats->addlist, &fc_stats->list);
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list_for_each_entry_safe(counter, tmp, &fc_stats->list, list) {
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list_del(&counter->list);
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mlx5_cmd_fc_free(dev, counter->id);
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kfree(counter);
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}
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}
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void mlx5_fc_query_cached(struct mlx5_fc *counter,
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u64 *bytes, u64 *packets, u64 *lastuse)
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{
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struct mlx5_fc_cache c;
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c = counter->cache;
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*bytes = c.bytes - counter->lastbytes;
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*packets = c.packets - counter->lastpackets;
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*lastuse = c.lastuse;
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counter->lastbytes = c.bytes;
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counter->lastpackets = c.packets;
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}
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@ -41,6 +41,7 @@
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/radix-tree.h>
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#include <linux/workqueue.h>
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#include <linux/mlx5/device.h>
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#include <linux/mlx5/doorbell.h>
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@ -457,6 +458,17 @@ struct mlx5_irq_info {
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char name[MLX5_MAX_IRQ_NAME];
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};
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struct mlx5_fc_stats {
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struct list_head list;
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struct list_head addlist;
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/* protect addlist add/splice operations */
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spinlock_t addlist_lock;
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struct workqueue_struct *wq;
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struct delayed_work work;
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unsigned long next_query;
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};
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struct mlx5_eswitch;
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struct mlx5_priv {
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@ -520,6 +532,8 @@ struct mlx5_priv {
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struct mlx5_flow_root_namespace *fdb_root_ns;
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struct mlx5_flow_root_namespace *esw_egress_root_ns;
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struct mlx5_flow_root_namespace *esw_ingress_root_ns;
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struct mlx5_fc_stats fc_stats;
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};
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enum mlx5_device_state {
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@ -127,4 +127,9 @@ int mlx5_modify_rule_destination(struct mlx5_flow_rule *rule,
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struct mlx5_flow_destination *dest);
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struct mlx5_fc *mlx5_flow_rule_counter(struct mlx5_flow_rule *rule);
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struct mlx5_fc *mlx5_fc_create(struct mlx5_core_dev *dev, bool aging);
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void mlx5_fc_destroy(struct mlx5_core_dev *dev, struct mlx5_fc *counter);
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void mlx5_fc_query_cached(struct mlx5_fc *counter,
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u64 *bytes, u64 *packets, u64 *lastuse);
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#endif
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