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From: "Van Haaren, Harry" <harry.van.haaren@intel.com>
To: "Horton, Remy" <remy.horton@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
CC: Thomas Monjalon <thomas.monjalon@6wind.com>
Thread-Topic: [dpdk-dev] [PATCH v7 3/6] lib: add bitrate statistics library
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Date: Tue, 17 Jan 2017 11:16:43 +0000
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Subject: Re: [dpdk-dev] [PATCH v7 3/6] lib: add bitrate statistics library
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> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Remy Horton
> Sent: Monday, January 16, 2017 4:20 PM
> To: dev@dpdk.org
> Cc: Thomas Monjalon <thomas.monjalon@6wind.com>
> Subject: [dpdk-dev] [PATCH v7 3/6] lib: add bitrate statistics library
>=20
> This patch adds a library that calculates peak and average data-rate
> statistics. For ethernet devices. These statistics are reported using
> the metrics library.
>=20
> Signed-off-by: Remy Horton <remy.horton@intel.com>
Comments inline
> ---
> MAINTAINERS | 4 +
> config/common_base | 5 +
> doc/api/doxy-api-index.md | 1 +
> doc/api/doxy-api.conf | 1 +
> doc/guides/rel_notes/release_17_02.rst | 5 +
> lib/Makefile | 1 +
> lib/librte_bitratestats/Makefile | 53 +++++++++
> lib/librte_bitratestats/rte_bitrate.c | 132 +++++++++++++++=
++++++
> lib/librte_bitratestats/rte_bitrate.h | 80 +++++++++++++
> .../rte_bitratestats_version.map | 9 ++
> mk/rte.app.mk | 1 +
> 11 files changed, 292 insertions(+)
> create mode 100644 lib/librte_bitratestats/Makefile
> create mode 100644 lib/librte_bitratestats/rte_bitrate.c
> create mode 100644 lib/librte_bitratestats/rte_bitrate.h
> create mode 100644 lib/librte_bitratestats/rte_bitratestats_version.map
>=20
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4a19497..6cd9896 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -601,6 +601,10 @@ M: Remy Horton <remy.horton@intel.com>
> F: lib/librte_metrics/
> F: doc/guides/sample_app_ug/keep_alive.rst
>=20
> +Bit-rate statistica
> +M: Remy Horton <remy.horton@intel.com>
> +F: lib/librte_bitratestats/
> +
>=20
> Test Applications
> -----------------
> diff --git a/config/common_base b/config/common_base
> index 0eb3866..decebe5 100644
> --- a/config/common_base
> +++ b/config/common_base
> @@ -598,3 +598,8 @@ CONFIG_RTE_TEST_PMD_RECORD_BURST_STATS=3Dn
> # Compile the device metrics library
> #
> CONFIG_RTE_LIBRTE_METRICS=3Dy
> +
> +#
> +# Compile the bitrate statistics library
> +#
> +CONFIG_RTE_LIBRTE_BITRATE=3Dy
> diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
> index 94f0f69..5e194b0 100644
> --- a/doc/api/doxy-api-index.md
> +++ b/doc/api/doxy-api-index.md
> @@ -151,4 +151,5 @@ There are many libraries, so their headers may be gro=
uped by topics:
> [ABI compat] (@ref rte_compat.h),
> [keepalive] (@ref rte_keepalive.h),
> [Device Metrics] (@ref rte_metrics.h),
> + [Bitrate Statistics] (@ref rte_bitrate.h),
> [version] (@ref rte_version.h)
> diff --git a/doc/api/doxy-api.conf b/doc/api/doxy-api.conf
> index 194b670..6e6ab5c 100644
> --- a/doc/api/doxy-api.conf
> +++ b/doc/api/doxy-api.conf
> @@ -35,6 +35,7 @@ INPUT =3D doc/api/doxy-api-index.md \
> lib/librte_eal/common/include \
> lib/librte_eal/common/include/generic \
> lib/librte_acl \
> + lib/librte_bitratestats \
> lib/librte_cfgfile \
> lib/librte_cmdline \
> lib/librte_compat \
> diff --git a/doc/guides/rel_notes/release_17_02.rst
> b/doc/guides/rel_notes/release_17_02.rst
> index 4fca29b..44012c8 100644
> --- a/doc/guides/rel_notes/release_17_02.rst
> +++ b/doc/guides/rel_notes/release_17_02.rst
> @@ -40,6 +40,11 @@ New Features
> intended to provide a reporting mechanism that is independent of th=
e
> ethdev library.
>=20
> + * **Added bit-rate calculation library.**
> +
> + A library that can be used to calculate device bit-rates. Calculate=
d
> + bitrates are reported using the metrics library.
> +
> This section is a comment. do not overwrite or remove it.
> Also, make sure to start the actual text at the margin.
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> diff --git a/lib/Makefile b/lib/Makefile
> index 5d85dcf..e211bc0 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -59,6 +59,7 @@ DIRS-$(CONFIG_RTE_LIBRTE_PIPELINE) +=3D librte_pipeline
> DIRS-$(CONFIG_RTE_LIBRTE_REORDER) +=3D librte_reorder
> DIRS-$(CONFIG_RTE_LIBRTE_PDUMP) +=3D librte_pdump
> DIRS-$(CONFIG_RTE_LIBRTE_METRICS) +=3D librte_metrics
> +DIRS-$(CONFIG_RTE_LIBRTE_BITRATE) +=3D librte_bitratestats
>=20
> ifeq ($(CONFIG_RTE_EXEC_ENV_LINUXAPP),y)
> DIRS-$(CONFIG_RTE_LIBRTE_KNI) +=3D librte_kni
> diff --git a/lib/librte_bitratestats/Makefile b/lib/librte_bitratestats/M=
akefile
> new file mode 100644
> index 0000000..b725d4e
> --- /dev/null
> +++ b/lib/librte_bitratestats/Makefile
> @@ -0,0 +1,53 @@
> +# BSD LICENSE
> +#
> +# Copyright(c) 2016 Intel Corporation. All rights reserved.
> +# All rights reserved.
Add -2017
> +#
> +# Redistribution and use in source and binary forms, with or without
> +# modification, are permitted provided that the following conditions
> +# are met:
> +#
> +# * Redistributions of source code must retain the above copyright
> +# notice, this list of conditions and the following disclaimer.
> +# * Redistributions in binary form must reproduce the above copyrigh=
t
> +# notice, this list of conditions and the following disclaimer in
> +# the documentation and/or other materials provided with the
> +# distribution.
> +# * Neither the name of Intel Corporation nor the names of its
> +# contributors may be used to endorse or promote products derived
> +# from this software without specific prior written permission.
> +#
> +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FO=
R
> +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL=
,
> +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE=
,
> +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON AN=
Y
> +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE US=
E
> +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> +
> +include $(RTE_SDK)/mk/rte.vars.mk
> +
> +# library name
> +LIB =3D librte_bitratestats.a
> +
> +CFLAGS +=3D $(WERROR_FLAGS) -I$(SRCDIR)
> +
> +EXPORT_MAP :=3D rte_bitratestats_version.map
> +
> +LIBABIVER :=3D 1
> +
> +# all source are stored in SRCS-y
> +SRCS-$(CONFIG_RTE_LIBRTE_BITRATE) :=3D rte_bitrate.c
> +
> +# Install header file
> +SYMLINK-$(CONFIG_RTE_LIBRTE_BITRATE)-include +=3D rte_bitrate.h
> +
> +DEPDIRS-$(CONFIG_RTE_LIBRTE_BITRATE) +=3D lib/librte_eal
> +DEPDIRS-$(CONFIG_RTE_LIBRTE_BITRATE) +=3D lib/librte_ether
> +DEPDIRS-$(CONFIG_RTE_LIBRTE_BITRATE) +=3D lib/librte_metrics
> +
> +include $(RTE_SDK)/mk/rte.lib.mk
> diff --git a/lib/librte_bitratestats/rte_bitrate.c b/lib/librte_bitratest=
ats/rte_bitrate.c
> new file mode 100644
> index 0000000..c8d9a20
> --- /dev/null
> +++ b/lib/librte_bitratestats/rte_bitrate.c
> @@ -0,0 +1,132 @@
> +/*-
> + * BSD LICENSE
> + *
> + * Copyright(c) 2016 Intel Corporation. All rights reserved.
> + * All rights reserved.
-2017
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + *
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyrig=
ht
> + * notice, this list of conditions and the following disclaimer in
> + * the documentation and/or other materials provided with the
> + * distribution.
> + * * Neither the name of Intel Corporation nor the names of its
> + * contributors may be used to endorse or promote products derived
> + * from this software without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS F=
OR
> + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGH=
T
> + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTA=
L,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF US=
E,
> + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON A=
NY
> + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE U=
SE
> + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE=
.
> + */
> +
> +#include <rte_common.h>
> +#include <rte_ethdev.h>
> +#include <rte_malloc.h>
> +#include <rte_metrics.h>
> +#include <rte_bitrate.h>
> +
> +/*
> + * Persistent bit-rate data.
> + * @internal
> + */
> +struct rte_stats_bitrate_s {
> + uint64_t last_ibytes;
> + uint64_t last_obytes;
> + uint64_t peak_ibits;
> + uint64_t peak_obits;
> + uint64_t ewma_ibits;
> + uint64_t ewma_obits;
> +};
Nit: same as previous metrics patch, any reason for the _s at the end? Same=
for following structs:
> +
> +struct rte_stats_bitrates_s {
> + struct rte_stats_bitrate_s port_stats[RTE_MAX_ETHPORTS];
> + uint16_t id_stats_set;
> +};
> +
> +struct rte_stats_bitrates_s *
> +rte_stats_bitrate_create(void)
> +{
> + return rte_zmalloc(NULL, sizeof(struct rte_stats_bitrates_s),
> + RTE_CACHE_LINE_SIZE);
> +}
Is the socket relevant here? Perhaps pass socket_id to the function, and us=
e rte_zmalloc_socket(). This function has no way of initializing bitrate st=
ructs on two different sockets, using one a single setup thread.
> +
> +int
> +rte_stats_bitrate_reg(struct rte_stats_bitrates_s *bitrate_data)
> +{
> + const char * const names[] =3D {
> + "mean_bits_in", "mean_bits_out",
> + "peak_bits_in", "peak_bits_out",
> + };
> + int return_value;
> +
> + return_value =3D rte_metrics_reg_metrics(&names[0], 4);
> + if (return_value >=3D 0)
> + bitrate_data->id_stats_set =3D return_value;
> + return return_value;
> +}
> +
> +int
> +rte_stats_bitrate_calc(struct rte_stats_bitrates_s *bitrate_data,
> + uint8_t port_id)
> +{
> + struct rte_stats_bitrate_s *port_data;
> + struct rte_eth_stats eth_stats;
> + int ret_code;
> + uint64_t cnt_bits;
> + int64_t delta;
> + const int64_t alpha_percent =3D 20;
> + uint64_t values[4];
> +
> + ret_code =3D rte_eth_stats_get(port_id, ð_stats);
> + if (ret_code !=3D 0)
> + return ret_code;
> +
> + port_data =3D &bitrate_data->port_stats[port_id];
> +
> + /* Incoming bitrate. This is an iteratively calculated EWMA
> + * (Expomentially Weighted Moving Average) that uses a
> + * weighting factor of alpha_percent.
> + */
> + cnt_bits =3D (eth_stats.ibytes - port_data->last_ibytes) << 3;
> + port_data->last_ibytes =3D eth_stats.ibytes;
> + if (cnt_bits > port_data->peak_ibits)
> + port_data->peak_ibits =3D cnt_bits;
> + delta =3D cnt_bits;
> + delta -=3D port_data->ewma_ibits;
> + /* The +-50 fixes integer rounding during divison */
> + if (delta > 0)
> + delta =3D (delta * alpha_percent + 50) / 100;
> + else
> + delta =3D (delta * alpha_percent - 50) / 100;
> + port_data->ewma_ibits +=3D delta;
The integer +50 feels a bit odd, I'm not opposed to this if it works though=
.
The latency stats uses a float alpha multiplier, is that a
cleaner solution? The two libraries should probably be consistent anyway.
> +
> + /* Outgoing bitrate (also EWMA) */
> + cnt_bits =3D (eth_stats.obytes - port_data->last_obytes) << 3;
> + port_data->last_obytes =3D eth_stats.obytes;
> + if (cnt_bits > port_data->peak_obits)
> + port_data->peak_obits =3D cnt_bits;
> + delta =3D cnt_bits;
> + delta -=3D port_data->ewma_obits;
> + delta =3D (delta * alpha_percent + 50) / 100;
Same float multiplier comment.
> + port_data->ewma_obits +=3D delta;
> +
> + values[0] =3D port_data->ewma_ibits;
> + values[1] =3D port_data->ewma_obits;
> + values[2] =3D port_data->peak_ibits;
> + values[3] =3D port_data->peak_obits;
> + rte_metrics_update_metrics(port_id, bitrate_data->id_stats_set,
> + values, 4);
> + return 0;
> +}
> diff --git a/lib/librte_bitratestats/rte_bitrate.h b/lib/librte_bitratest=
ats/rte_bitrate.h
> new file mode 100644
> index 0000000..bc87c5e
> --- /dev/null
> +++ b/lib/librte_bitratestats/rte_bitrate.h
> @@ -0,0 +1,80 @@
> +/*-
> + * BSD LICENSE
> + *
> + * Copyright(c) 2016 Intel Corporation. All rights reserved.
> + * All rights reserved.
-2017
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + *
> + * * Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * * Redistributions in binary form must reproduce the above copyrig=
ht
> + * notice, this list of conditions and the following disclaimer in
> + * the documentation and/or other materials provided with the
> + * distribution.
> + * * Neither the name of Intel Corporation nor the names of its
> + * contributors may be used to endorse or promote products derived
> + * from this software without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS F=
OR
> + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGH=
T
> + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTA=
L,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF US=
E,
> + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON A=
NY
> + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE U=
SE
> + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE=
.
> + */
> +
> +
> +/**
> + * Bitrate statistics data structure.
> + * This data structure is intentionally opaque.
> + */
> +struct rte_stats_bitrates_s;
_s question as previously highlighted.
> +
> +
> +/**
> + * Allocate a bitrate statistics structure
> + *
> + * @return
> + * - Pointer to structure on success
> + * - NULL on error (zmalloc failure)
> + */
> +struct rte_stats_bitrates_s *rte_stats_bitrate_create(void);
> +
> +
> +/**
> + * Register bitrate statistics with the metric library.
> + *
> + * @param bitrate_data
> + * Pointer allocated by rte_stats_create()
> + *
> + * @return
> + * Zero on success
> + * Negative on error
> + */
> +int rte_stats_bitrate_reg(struct rte_stats_bitrates_s *bitrate_data);
> +
> +
> +/**
> + * Calculate statistics for current time window. The period with which
> + * this function is called should be the intended sampling window width.
> + *
> + * @param bitrate_data
> + * Bitrate statistics data pointer
> + *
> + * @param port_id
> + * Port id to calculate statistics for
> + *
> + * @return
> + * - Zero on success
> + * - Negative value on error
> + */
> +int rte_stats_bitrate_calc(struct rte_stats_bitrates_s *bitrate_data,
> + uint8_t port_id);
> diff --git a/lib/librte_bitratestats/rte_bitratestats_version.map
> b/lib/librte_bitratestats/rte_bitratestats_version.map
> new file mode 100644
> index 0000000..66f232f
> --- /dev/null
> +++ b/lib/librte_bitratestats/rte_bitratestats_version.map
> @@ -0,0 +1,9 @@
> +DPDK_17.02 {
> + global:
> +
> + rte_stats_bitrate_calc;
> + rte_stats_bitrate_create;
> + rte_stats_bitrate_reg;
> +
> + local: *;
> +};
> diff --git a/mk/rte.app.mk b/mk/rte.app.mk
> index 40fcf33..6aac5ac 100644
> --- a/mk/rte.app.mk
> +++ b/mk/rte.app.mk
> @@ -99,6 +99,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_EAL) +=3D -lrte_=
eal
> _LDLIBS-$(CONFIG_RTE_LIBRTE_CMDLINE) +=3D -lrte_cmdline
> _LDLIBS-$(CONFIG_RTE_LIBRTE_CFGFILE) +=3D -lrte_cfgfile
> _LDLIBS-$(CONFIG_RTE_LIBRTE_METRICS) +=3D -lrte_metrics
> +_LDLIBS-$(CONFIG_RTE_LIBRTE_BITRATE) +=3D -lrte_bitratestats
>=20
>=20
> _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_BOND) +=3D -lrte_pmd_bond
> --
> 2.5.5