patches for DPDK stable branches
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From: "Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>
To: "Yigit, Ferruh" <ferruh.yigit@intel.com>,
	Ray Kinsella <mdr@ashroe.eu>, Neil Horman <nhorman@tuxdriver.com>,
	Eelco Chaudron <echaudro@redhat.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	Thomas Monjalon <thomas@monjalon.net>,
	David Marchand <david.marchand@redhat.com>,
	"stable@dpdk.org" <stable@dpdk.org>,
	Luca Boccassi <bluca@debian.org>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Stokes, Ian" <ian.stokes@intel.com>,
	"Andrzej Ostruszka" <amo@semihalf.com>,
	"techboard@dpdl.org" <techboard@dpdl.org>
Subject: Re: [dpdk-stable] [PATCH v6] meter: provide experimental alias of API for old apps
Date: Tue, 19 May 2020 13:26:26 +0000
Message-ID: <BYAPR11MB293544B8CB4215B99EC34637EBB90@BYAPR11MB2935.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20200519121629.3590459-1-ferruh.yigit@intel.com>



> -----Original Message-----
> From: Yigit, Ferruh <ferruh.yigit@intel.com>
> Sent: Tuesday, May 19, 2020 1:16 PM
> To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>; Ray Kinsella
> <mdr@ashroe.eu>; Neil Horman <nhorman@tuxdriver.com>; Eelco
> Chaudron <echaudro@redhat.com>
> Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>; Thomas Monjalon
> <thomas@monjalon.net>; David Marchand <david.marchand@redhat.com>;
> stable@dpdk.org; Luca Boccassi <bluca@debian.org>; Richardson, Bruce
> <bruce.richardson@intel.com>; Stokes, Ian <ian.stokes@intel.com>; Andrzej
> Ostruszka <amo@semihalf.com>
> Subject: [PATCH v6] meter: provide experimental alias of API for old apps
> 
> On v20.02 some meter APIs have been matured and symbols moved from
> EXPERIMENTAL to DPDK_20.0.1 block.
> 
> This can break the applications that were using these mentioned APIs on
> v19.11. Although there is no modification on the APIs and the action is
> positive and matures the APIs, the affect can be negative to
> applications.
> 
> This patch provides aliasing by duplicating the existing and versioned
> symbols as experimental.
> 
> Since symbols moved from DPDK_20.0.1 to DPDK_21 block in the v20.05, the
> aliasing done between EXPERIMENTAL and DPDK_21.
> 
> With DPDK_21 ABI (DPDK v20.11) all aliasing will be removed and only
> stable version of the APIs will remain.
> 
> Fixes: 30512af820fe ("meter: remove experimental flag from RFC4115 trTCM
> API")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
> ---
> Cc: Neil Horman <nhorman@tuxdriver.com>
> Cc: Thomas Monjalon <thomas@monjalon.net>
> Cc: Luca Boccassi <bluca@debian.org>
> Cc: David Marchand <david.marchand@redhat.com>
> Cc: Bruce Richardson <bruce.richardson@intel.com>
> Cc: Ian Stokes <ian.stokes@intel.com>
> Cc: Eelco Chaudron <echaudro@redhat.com>
> Cc: Andrzej Ostruszka <amo@semihalf.com>
> Cc: Ray Kinsella <mdr@ashroe.eu>
> Cc: cristian.dumitrescu@intel.com
> 
> v2:
> * Commit log updated
> 
> v3:
> * added suggested comment to VERSION_SYMBOL_EXPERIMENTAL macro
> 
> v4:
> * update script name in commit log, remove empty line
> 
> v5:
> * Patch has only meter library changes
> * Aliasing moved into rte_meter_compat.c
> 
> v6:
> * Move aliasing back to rte_meter.c
> * Rename static function to have '__' prefix
> * Add comment to alias code
> ---
>  lib/librte_meter/meson.build           |  1 +
>  lib/librte_meter/rte_meter.c           | 73 ++++++++++++++++++++++++--
>  lib/librte_meter/rte_meter_version.map |  8 +++
>  3 files changed, 79 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/librte_meter/meson.build b/lib/librte_meter/meson.build
> index 646fd4d43f..fce0368437 100644
> --- a/lib/librte_meter/meson.build
> +++ b/lib/librte_meter/meson.build
> @@ -3,3 +3,4 @@
> 
>  sources = files('rte_meter.c')
>  headers = files('rte_meter.h')
> +use_function_versioning = true
> diff --git a/lib/librte_meter/rte_meter.c b/lib/librte_meter/rte_meter.c
> index da01429a8b..149cf58bdd 100644
> --- a/lib/librte_meter/rte_meter.c
> +++ b/lib/librte_meter/rte_meter.c
> @@ -9,6 +9,7 @@
>  #include <rte_common.h>
>  #include <rte_log.h>
>  #include <rte_cycles.h>
> +#include <rte_function_versioning.h>
> 
>  #include "rte_meter.h"
> 
> @@ -119,8 +120,15 @@ rte_meter_trtcm_config(struct rte_meter_trtcm
> *m,
>  	return 0;
>  }
> 
> -int
> -rte_meter_trtcm_rfc4115_profile_config(
> +/*
> + *  ABI aliasing done for 'rte_meter_trtcm_rfc4115_profile_config'
> + *  to support both EXPERIMENTAL and DPDK_21 versions
> + *  This versioning will be removed on next ABI version (v20.11)
> + *  and '__rte_meter_trtcm_rfc4115_profile_config' will be restrored back
> to
> + *  'rte_meter_trtcm_rfc4115_profile_config' without versioning.
> + */
> +static int
> +__rte_meter_trtcm_rfc4115_profile_config(
>  	struct rte_meter_trtcm_rfc4115_profile *p,
>  	struct rte_meter_trtcm_rfc4115_params *params)
>  {
> @@ -145,7 +153,42 @@ rte_meter_trtcm_rfc4115_profile_config(
>  }
> 
>  int
> -rte_meter_trtcm_rfc4115_config(
> +rte_meter_trtcm_rfc4115_profile_config_s(
> +	struct rte_meter_trtcm_rfc4115_profile *p,
> +	struct rte_meter_trtcm_rfc4115_params *params);
> +int
> +rte_meter_trtcm_rfc4115_profile_config_s(
> +	struct rte_meter_trtcm_rfc4115_profile *p,
> +	struct rte_meter_trtcm_rfc4115_params *params)
> +{
> +	return __rte_meter_trtcm_rfc4115_profile_config(p, params);
> +}
> +BIND_DEFAULT_SYMBOL(rte_meter_trtcm_rfc4115_profile_config, _s, 21);
> +MAP_STATIC_SYMBOL(int rte_meter_trtcm_rfc4115_profile_config(struct
> rte_meter_trtcm_rfc4115_profile *p,
> +		struct rte_meter_trtcm_rfc4115_params *params),
> rte_meter_trtcm_rfc4115_profile_config_s);
> +
> +int
> +rte_meter_trtcm_rfc4115_profile_config_e(
> +	struct rte_meter_trtcm_rfc4115_profile *p,
> +	struct rte_meter_trtcm_rfc4115_params *params);
> +int
> +rte_meter_trtcm_rfc4115_profile_config_e(
> +	struct rte_meter_trtcm_rfc4115_profile *p,
> +	struct rte_meter_trtcm_rfc4115_params *params)
> +{
> +	return __rte_meter_trtcm_rfc4115_profile_config(p, params);
> +}
> +VERSION_SYMBOL_EXPERIMENTAL(rte_meter_trtcm_rfc4115_profile_conf
> ig, _e);
> +
> +/*
> + *  ABI aliasing done for 'rte_meter_trtcm_rfc4115_config'
> + *  to support both EXPERIMENTAL and DPDK_21 versions
> + *  This versioning will be removed on next ABI version (v20.11)
> + *  and '__rte_meter_trtcm_rfc4115_config' will be restrored back to
> + *  'rte_meter_trtcm_rfc4115_config' without versioning.
> + */
> +static int
> +__rte_meter_trtcm_rfc4115_config(
>  	struct rte_meter_trtcm_rfc4115 *m,
>  	struct rte_meter_trtcm_rfc4115_profile *p)
>  {
> @@ -160,3 +203,27 @@ rte_meter_trtcm_rfc4115_config(
> 
>  	return 0;
>  }
> +
> +int
> +rte_meter_trtcm_rfc4115_config_s(struct rte_meter_trtcm_rfc4115 *m,
> +	struct rte_meter_trtcm_rfc4115_profile *p);
> +int
> +rte_meter_trtcm_rfc4115_config_s(struct rte_meter_trtcm_rfc4115 *m,
> +	struct rte_meter_trtcm_rfc4115_profile *p)
> +{
> +	return __rte_meter_trtcm_rfc4115_config(m, p);
> +}
> +BIND_DEFAULT_SYMBOL(rte_meter_trtcm_rfc4115_config, _s, 21);
> +MAP_STATIC_SYMBOL(int rte_meter_trtcm_rfc4115_config(struct
> rte_meter_trtcm_rfc4115 *m,
> +		 struct rte_meter_trtcm_rfc4115_profile *p),
> rte_meter_trtcm_rfc4115_config_s);
> +
> +int
> +rte_meter_trtcm_rfc4115_config_e(struct rte_meter_trtcm_rfc4115 *m,
> +	struct rte_meter_trtcm_rfc4115_profile *p);
> +int
> +rte_meter_trtcm_rfc4115_config_e(struct rte_meter_trtcm_rfc4115 *m,
> +	struct rte_meter_trtcm_rfc4115_profile *p)
> +{
> +	return __rte_meter_trtcm_rfc4115_config(m, p);
> +}
> +VERSION_SYMBOL_EXPERIMENTAL(rte_meter_trtcm_rfc4115_config, _e);
> diff --git a/lib/librte_meter/rte_meter_version.map
> b/lib/librte_meter/rte_meter_version.map
> index 2c7dadbcac..b493bcebe9 100644
> --- a/lib/librte_meter/rte_meter_version.map
> +++ b/lib/librte_meter/rte_meter_version.map
> @@ -20,4 +20,12 @@ DPDK_21 {
>  	rte_meter_trtcm_rfc4115_color_blind_check;
>  	rte_meter_trtcm_rfc4115_config;
>  	rte_meter_trtcm_rfc4115_profile_config;
> +
>  } DPDK_20.0;
> +
> +EXPERIMENTAL {
> +       global:
> +
> +	rte_meter_trtcm_rfc4115_config;
> +	rte_meter_trtcm_rfc4115_profile_config;
> +};
> --
> 2.25.4

Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

Thanks, Ferruh and Ray!

I am OK to let this is temporarily until release 20.11.

Regarding the API breakage larger problem,  this method only fixes the case of experimental APIs transitioning to non-experimental status with no modifications, but it does not handle the following possible cases:

	1. Experimental APIs transitioning to non-experimental status with some modifications.
	2. Experimental APIs being removed.
	3. Non-experimental APIs transitioning to deprecated status.

We need a clear procedure & timing for all these cases to avoid similar situations in the future. Likely a good topic for techboard discussion.

  reply	other threads:[~2020-05-19 13:26 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200513121149.2283385-1-ferruh.yigit@intel.com>
2020-05-13 18:05 ` [dpdk-stable] [PATCH v2] " Ferruh Yigit
2020-05-14  8:44   ` Ray Kinsella
2020-05-14 11:53     ` Ferruh Yigit
2020-05-14 11:52 ` [dpdk-stable] [PATCH v3] " Ferruh Yigit
2020-05-14 15:10   ` Ray Kinsella
2020-05-14 15:32   ` David Marchand
2020-05-14 15:56     ` Ray Kinsella
2020-05-14 16:07     ` Ferruh Yigit
2020-05-14 16:30       ` David Marchand
2020-05-14 16:11 ` [dpdk-stable] [PATCH v4] " Ferruh Yigit
2020-05-15 13:31   ` Thomas Monjalon
2020-05-15 14:41     ` Ray Kinsella
2020-05-15 15:03     ` Ray Kinsella
2020-05-15 14:36   ` [dpdk-stable] [dpdk-dev] " Ray Kinsella
2020-05-15 15:01   ` Ray Kinsella
2020-05-17 19:52   ` [dpdk-stable] " Dumitrescu, Cristian
2020-05-18  6:29     ` Ray Kinsella
2020-05-18  9:22       ` Thomas Monjalon
2020-05-18  9:30         ` Ray Kinsella
2020-05-18 10:46           ` Thomas Monjalon
2020-05-18 11:18             ` Dumitrescu, Cristian
2020-05-18 11:49               ` Ray Kinsella
2020-05-18 11:48             ` Ray Kinsella
2020-05-18 12:13               ` Thomas Monjalon
2020-05-18 13:06                 ` Ray Kinsella
2020-05-18 18:30 ` [dpdk-stable] [PATCH v5] " Ferruh Yigit
2020-05-19 12:16 ` [dpdk-stable] [PATCH v6] " Ferruh Yigit
2020-05-19 13:26   ` Dumitrescu, Cristian [this message]
2020-05-19 14:24     ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2020-05-19 14:22   ` [dpdk-stable] " Ray Kinsella

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