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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Hideyuki Yamashita <yamashita.hideyuki@ntt-tx.co.jp>,
	Thomas Monjalon <thomas@monjalon.net>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	"Andrew Rybchenko" <andrew.rybchenko@oktetlabs.ru>,
	Ray Kinsella <mdr@ashroe.eu>, Neil Horman <nhorman@tuxdriver.com>,
	"Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	Hideyuki Yamashita <yamashtia.hideyuki@ntt-tx.co.jp>
Subject: Re: [dpdk-dev] [PATCH 5/5] librte_ethdev: add to use apistats
Date: Mon, 7 Dec 2020 12:38:12 +0000
Message-ID: <BYAPR11MB3301E02488007B3746E71E2D9ACE0@BYAPR11MB3301.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20201204075109.14694-6-yamashita.hideyuki@ntt-tx.co.jp>

Hi,

> 
> This patch modifies to use apistats by librte_ethdev.
> 
> Signed-off-by: Hideyuki Yamashita <yamashtia.hideyuki@ntt-tx.co.jp>
> ---
>  lib/librte_ethdev/meson.build    |  6 ++-
>  lib/librte_ethdev/rte_apistats.c | 64 ++++++++++++++++++++++++++++++++
>  lib/librte_ethdev/rte_apistats.h | 64 ++++++++++++++++++++++++++++++++
>  lib/librte_ethdev/rte_ethdev.h   |  7 ++++
>  lib/librte_ethdev/version.map    |  5 +++
>  5 files changed, 144 insertions(+), 2 deletions(-)
>  create mode 100644 lib/librte_ethdev/rte_apistats.c
>  create mode 100644 lib/librte_ethdev/rte_apistats.h
> 
> diff --git a/lib/librte_ethdev/meson.build b/lib/librte_ethdev/meson.build
> index e4b6102..d03e784 100644
> --- a/lib/librte_ethdev/meson.build
> +++ b/lib/librte_ethdev/meson.build
> @@ -8,7 +8,8 @@ sources = files('ethdev_private.c',
>  	'rte_ethdev.c',
>  	'rte_flow.c',
>  	'rte_mtr.c',
> -	'rte_tm.c')
> +	'rte_tm.c' ,
> +        'rte_apistats.c')
> 
>  headers = files('rte_ethdev.h',
>  	'rte_ethdev_driver.h',
> @@ -24,6 +25,7 @@ headers = files('rte_ethdev.h',
>  	'rte_mtr.h',
>  	'rte_mtr_driver.h',
>  	'rte_tm.h',
> -	'rte_tm_driver.h')
> +	'rte_tm_driver.h',
> +        'rte_apistats.h')
> 
>  deps += ['net', 'kvargs', 'meter', 'telemetry']
> diff --git a/lib/librte_ethdev/rte_apistats.c b/lib/librte_ethdev/rte_apistats.c
> new file mode 100644
> index 0000000..c4bde34
> --- /dev/null
> +++ b/lib/librte_ethdev/rte_apistats.c
> @@ -0,0 +1,64 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2019 NTT TechnoCross Corporation
> + */
> +
> +
> +#include <unistd.h>
> +#include <sys/types.h>
> +#include <string.h>
> +#include <rte_log.h>
> +#include <rte_memzone.h>
> +#include <rte_lcore.h>
> +
> +#include "rte_apistats.h"
> +
> +/* Macros for printing using RTE_LOG */
> +#define RTE_LOGTYPE_APISTATS RTE_LOGTYPE_USER1
> +
> +#define MZ_APISTATS "rte_apistats"
> +
> +struct rte_apistats *rte_apicounts;
> +
> +int rte_apistats_init(void)
> +{
> +	int i;
> +	const struct rte_memzone *mz = NULL;
> +	const unsigned int flags = 0;
> +
> +	/** Allocate stats in shared memory fo multi process support */
> +	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
> +		mz = rte_memzone_lookup(MZ_APISTATS);
> +		if (mz == NULL) {
> +			RTE_LOG(ERR, APISTATS, "Cannot get info structure\n");
> +			return -1;
> +		}
> +		rte_apicounts = mz->addr;
> +	} else {
> +		/* RTE_PROC_PRIMARY */
> +		mz = rte_memzone_reserve(MZ_APISTATS, sizeof(*rte_apicounts),
> +			rte_socket_id(), flags);
> +		if (mz == NULL) {
> +			RTE_LOG(ERR, APISTATS, "Cannot reserve memory zone\n");
> +			return -ENOMEM;
> +		}
> +		rte_apicounts = mz->addr;
> +		memset(rte_apicounts, 0, sizeof(*rte_apicounts));
> +	}
> +
> +	/* set up array for data */
> +	RTE_LCORE_FOREACH(i) {
> +		rte_apicounts->lcoreid_list[i] = 1;
> +		RTE_LOG(INFO, APISTATS, "Enable core usage for lcore %u\n", i);
> +	}
> +	return 0;
> +}
> +
> +int rte_apistats_uninit(void)
> +{
> +	const struct rte_memzone *mz = NULL;
> +	/* free up the memzone */
> +	mz = rte_memzone_lookup(MZ_APISTATS);
> +	if (mz)
> +		rte_memzone_free(mz);
> +	return 0;
> +}
> diff --git a/lib/librte_ethdev/rte_apistats.h b/lib/librte_ethdev/rte_apistats.h
> new file mode 100644
> index 0000000..afea50e
> --- /dev/null
> +++ b/lib/librte_ethdev/rte_apistats.h
> @@ -0,0 +1,64 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2019 NTT TechnoCross Corporation
> + */
> +
> +#ifndef _RTE_APISTATS_H_
> +#define _RTE_APISTATS_H_
> +
> +/**
> + * @file
> + * RTE apistats
> + *
> + * library to provide rte_rx_burst/tx_burst api stats.
> + */
> +
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#include <rte_compat.h>
> +#include <rte_lcore.h>
> +
> +/**
> + * A structure for rte_rx_burst/tx_burst api statistics.
> + */
> +struct rte_apistats {
> +	int lcoreid_list[RTE_MAX_LCORE];        /**< In use lcoreid list */
> +	/**< Total rte_rx_burst call counts */
> +	uint64_t rx_burst_counts[RTE_MAX_LCORE];
> +
> +	/**< Total rte_tx_burst call counts */
> +	uint64_t tx_burst_counts[RTE_MAX_LCORE];
> +};
> +
> +extern struct rte_apistats *rte_apicounts;
> +
> +/**
> + *  Initialize rte_rx_burst/tx_burst call count area.
> + *  @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + *  @return
> + *   -1     : On error
> + *   -ENOMEM: On error
> + *    0     : On success
> + */
> +__rte_experimental
> +int rte_apistats_init(void);
> +
> +/**
> + *  Clean up and free memory.
> + *  @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + *  @return
> + *   -1: On error
> + *    0: On success
> + */
> +__rte_experimental
> +int rte_apistats_uninit(void);
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* _RTE_APISTATS_H_ */
> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> index f5f8919..bef9bc6 100644
> --- a/lib/librte_ethdev/rte_ethdev.h
> +++ b/lib/librte_ethdev/rte_ethdev.h
> @@ -160,6 +160,7 @@ extern "C" {
> 
>  #include "rte_ethdev_trace_fp.h"
>  #include "rte_dev_info.h"
> +#include <rte_apistats.h>
> 
>  extern int rte_eth_dev_logtype;
> 
> @@ -4849,6 +4850,9 @@ rte_eth_rx_burst(uint16_t port_id, uint16_t queue_id,
>  	nb_rx = (*dev->rx_pkt_burst)(dev->data->rx_queues[queue_id],
>  				     rx_pkts, nb_pkts);
> 
> +	int lcore_id = rte_lcore_id();
> +	rte_apicounts->rx_burst_counts[lcore_id]++;

There are few problems with current implementation:
1.  rx_burst() can be called by non-EAL thread (rte_lcore_id() == -1)
    In that case it would cause a crash.
2. Because of the layout of struct rte_apistats it would cause significant
    performance degradation (false cache-lines sharing).

As a generic one: such sort of statistics can be easily collected by the app itself.
Either by just incrementing counters before rx/tx_burst function call directly or
via rx/tx callbacks.
So I don't see any point to push it inside ethdev layer.  
Konstantin

>  #ifdef RTE_ETHDEV_RXTX_CALLBACKS
>  	struct rte_eth_rxtx_callback *cb;
> 
> @@ -5124,6 +5128,9 @@ rte_eth_tx_burst(uint16_t port_id, uint16_t queue_id,
>  	}
>  #endif
> 
> +	int lcore_id = rte_lcore_id();
> +	rte_apicounts->tx_burst_counts[lcore_id]++;
>  #ifdef RTE_ETHDEV_RXTX_CALLBACKS
>  	struct rte_eth_rxtx_callback *cb;
> 
> diff --git a/lib/librte_ethdev/version.map b/lib/librte_ethdev/version.map
> index d3f5410..adea432 100644
> --- a/lib/librte_ethdev/version.map
> +++ b/lib/librte_ethdev/version.map
> @@ -240,6 +240,11 @@ EXPERIMENTAL {
>  	rte_flow_get_restore_info;
>  	rte_flow_tunnel_action_decap_release;
>  	rte_flow_tunnel_item_release;
> +
> +        # added in 21.02
> +        rte_apistats_init;
> +        rte_apistats_uninit;
> +        rte_apicounts;
>  };
> 
>  INTERNAL {
> --
> 2.18.0


  parent reply	other threads:[~2020-12-07 12:38 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04  7:51 [dpdk-dev] [PATCH 0/5] add apistats function Hideyuki Yamashita
2020-12-04  7:51 ` [dpdk-dev] [PATCH 1/5] maintainers: update maintainers file for apistats Hideyuki Yamashita
2020-12-05 13:27   ` Varghese, Vipin
2020-12-24  6:36     ` Hideyuki Yamashita
2020-12-04  7:51 ` [dpdk-dev] [PATCH 2/5] app/proc-info: add to use apistats Hideyuki Yamashita
2020-12-05 13:15   ` Varghese, Vipin
2020-12-04  7:51 ` [dpdk-dev] [PATCH 3/5] app/test-pmd: " Hideyuki Yamashita
2020-12-05 13:04   ` Varghese, Vipin
2020-12-04  7:51 ` [dpdk-dev] [PATCH 4/5] docs: add description of apistats parameter into proc-info Hideyuki Yamashita
2020-12-05 13:02   ` Varghese, Vipin
2020-12-07  9:48     ` Pattan, Reshma
2020-12-04  7:51 ` [dpdk-dev] [PATCH 5/5] librte_ethdev: add to use apistats Hideyuki Yamashita
2020-12-05 13:01   ` Varghese, Vipin
2020-12-06 17:47   ` Stephen Hemminger
2020-12-24  6:33     ` Hideyuki Yamashita
2020-12-07 12:38   ` Ananyev, Konstantin [this message]
2020-12-22  2:48     ` Hideyuki Yamashita
2020-12-22  2:50     ` Hideyuki Yamashita
2020-12-22  9:04       ` Morten Brørup
2020-12-22 13:05       ` Ananyev, Konstantin
2020-12-04  9:09 ` [dpdk-dev] [PATCH 0/5] add apistats function Ferruh Yigit
2020-12-04 10:20 ` David Hunt
2020-12-05 13:23   ` Varghese, Vipin
2020-12-24  6:43     ` Hideyuki Yamashita
2020-12-24 12:35       ` Varghese, Vipin
2020-12-22  2:16   ` Hideyuki Yamashita
2020-12-07  9:46 ` Thomas Monjalon
2020-12-22  2:22   ` Hideyuki Yamashita
2021-02-22 15:10     ` Ferruh Yigit

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