Re: [dpdk-dev] [PATCH v3 1/3] port: add kni interface support

["Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>]

Hi Ethan,

Thank you, here are some comments inlined below.

Please reorganize this patch in a slightly different way to look similar to other DPDK patch sets and also ease up the integration work for Thomas:
	Patch 0: I suggest adding a cover letter;
	Patch 1: all librte_port changes (rte_port_kni.h, rte_port_kni.c, Makefile, rte_port_version.map), including the "nodrop" KNI port version
	Patch 2: all ip_pipeline app changes
	Patch 3: ip_pipeline app kni.cfg file
	Patch 4: Documentation changes

> -----Original Message-----
> From: WeiJie Zhuang [mailto:zhuangwj@gmail.com]
> Sent: Thursday, June 16, 2016 12:27 PM
> To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>
> Cc: dev@dpdk.org; Singh, Jasvinder <jasvinder.singh@intel.com>; Yigit,
> Ferruh <ferruh.yigit@intel.com>; WeiJie Zhuang <zhuangwj@gmail.com>
> Subject: [PATCH v3 1/3] port: add kni interface support
> 
> 1. add KNI port type to the packet framework
> 2. add KNI support to the IP Pipeline sample Application
> 3. some bug fix
> 
> Signed-off-by: WeiJie Zhuang <zhuangwj@gmail.com>
> ---
> v2:
> * Fix check patch error.
> v3:
> * Fix code review comments.
> ---
>  doc/api/doxy-api-index.md                          |   1 +
>  examples/ip_pipeline/Makefile                      |   2 +-
>  examples/ip_pipeline/app.h                         | 181 +++++++++++-
>  examples/ip_pipeline/config/kni.cfg                |  67 +++++
>  examples/ip_pipeline/config_check.c                |  26 +-
>  examples/ip_pipeline/config_parse.c                | 166 ++++++++++-
>  examples/ip_pipeline/init.c                        | 132 ++++++++-
>  examples/ip_pipeline/pipeline/pipeline_common_fe.c |  29 ++
>  examples/ip_pipeline/pipeline/pipeline_master_be.c |   6 +
>  examples/ip_pipeline/pipeline_be.h                 |  27 ++
>  lib/librte_port/Makefile                           |   7 +
>  lib/librte_port/rte_port_kni.c                     | 325 +++++++++++++++++++++
>  lib/librte_port/rte_port_kni.h                     |  82 ++++++
>  lib/librte_port/rte_port_version.map               |   8 +
>  14 files changed, 1047 insertions(+), 12 deletions(-)
>  create mode 100644 examples/ip_pipeline/config/kni.cfg
>  create mode 100644 lib/librte_port/rte_port_kni.c
>  create mode 100644 lib/librte_port/rte_port_kni.h
> 
> diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
> index f626386..5e7f024 100644
> --- a/doc/api/doxy-api-index.md
> +++ b/doc/api/doxy-api-index.md
> @@ -118,6 +118,7 @@ There are many libraries, so their headers may be
> grouped by topics:
>      [frag]             (@ref rte_port_frag.h),
>      [reass]            (@ref rte_port_ras.h),
>      [sched]            (@ref rte_port_sched.h),
> +    [kni]              (@ref rte_port_kni.h),
>      [src/sink]         (@ref rte_port_source_sink.h)
>    * [table]            (@ref rte_table.h):
>      [lpm IPv4]         (@ref rte_table_lpm.h),
> diff --git a/examples/ip_pipeline/Makefile b/examples/ip_pipeline/Makefile
> index 5827117..6dc3f52 100644
> --- a/examples/ip_pipeline/Makefile
> +++ b/examples/ip_pipeline/Makefile
> @@ -1,6 +1,6 @@
>  #   BSD LICENSE
>  #
> -#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
> +#   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
>  #   All rights reserved.
>  #
>  #   Redistribution and use in source and binary forms, with or without
> diff --git a/examples/ip_pipeline/app.h b/examples/ip_pipeline/app.h
> index 7611341..abbd6d4 100644
> --- a/examples/ip_pipeline/app.h
> +++ b/examples/ip_pipeline/app.h
> @@ -44,6 +44,9 @@
>  #include <cmdline_parse.h>
> 
>  #include <rte_ethdev.h>
> +#ifdef RTE_LIBRTE_KNI
> +#include <rte_kni.h>
> +#endif
> 
>  #include "cpu_core_map.h"
>  #include "pipeline.h"
> @@ -132,6 +135,20 @@ struct app_pktq_swq_params {
>  	uint32_t mempool_indirect_id;
>  };
> 
> +struct app_pktq_kni_params {
> +	char *name;
> +	uint32_t parsed;
> +
> +	uint32_t socket_id;
> +	uint32_t core_id;
> +	uint32_t hyper_th_id;
> +	uint32_t force_bind;
> +
> +	uint32_t mempool_id; /* Position in the app->mempool_params */
> +	uint32_t burst_read;
> +	uint32_t burst_write;
> +};
> +
>  #ifndef APP_FILE_NAME_SIZE
>  #define APP_FILE_NAME_SIZE                       256
>  #endif
> @@ -185,6 +202,7 @@ enum app_pktq_in_type {
>  	APP_PKTQ_IN_HWQ,
>  	APP_PKTQ_IN_SWQ,
>  	APP_PKTQ_IN_TM,
> +	APP_PKTQ_IN_KNI,
>  	APP_PKTQ_IN_SOURCE,
>  };
> 
> @@ -197,6 +215,7 @@ enum app_pktq_out_type {
>  	APP_PKTQ_OUT_HWQ,
>  	APP_PKTQ_OUT_SWQ,
>  	APP_PKTQ_OUT_TM,
> +	APP_PKTQ_OUT_KNI,
>  	APP_PKTQ_OUT_SINK,
>  };
> 
> @@ -420,6 +439,8 @@ struct app_eal_params {
> 
>  #define APP_MAX_PKTQ_TM                          APP_MAX_LINKS
> 
> +#define APP_MAX_PKTQ_KNI                         APP_MAX_LINKS
> +
>  #ifndef APP_MAX_PKTQ_SOURCE
>  #define APP_MAX_PKTQ_SOURCE                      64
>  #endif
> @@ -471,6 +492,7 @@ struct app_params {
>  	struct app_pktq_hwq_out_params
> hwq_out_params[APP_MAX_HWQ_OUT];
>  	struct app_pktq_swq_params swq_params[APP_MAX_PKTQ_SWQ];
>  	struct app_pktq_tm_params tm_params[APP_MAX_PKTQ_TM];
> +	struct app_pktq_kni_params kni_params[APP_MAX_PKTQ_KNI];
>  	struct app_pktq_source_params
> source_params[APP_MAX_PKTQ_SOURCE];
>  	struct app_pktq_sink_params sink_params[APP_MAX_PKTQ_SINK];
>  	struct app_msgq_params msgq_params[APP_MAX_MSGQ];
> @@ -482,6 +504,7 @@ struct app_params {
>  	uint32_t n_pktq_hwq_out;
>  	uint32_t n_pktq_swq;
>  	uint32_t n_pktq_tm;
> +	uint32_t n_pktq_kni;
>  	uint32_t n_pktq_source;
>  	uint32_t n_pktq_sink;
>  	uint32_t n_msgq;
> @@ -495,6 +518,9 @@ struct app_params {
>  	struct app_link_data link_data[APP_MAX_LINKS];
>  	struct rte_ring *swq[APP_MAX_PKTQ_SWQ];
>  	struct rte_sched_port *tm[APP_MAX_PKTQ_TM];
> +#ifdef RTE_LIBRTE_KNI
> +	struct rte_kni *kni[APP_MAX_PKTQ_KNI];
> +#endif /* RTE_LIBRTE_KNI */
>  	struct rte_ring *msgq[APP_MAX_MSGQ];
>  	struct pipeline_type pipeline_type[APP_MAX_PIPELINE_TYPES];
>  	struct app_pipeline_data pipeline_data[APP_MAX_PIPELINES];
> @@ -667,11 +693,11 @@ app_swq_get_reader(struct app_params *app,
>  	struct app_pktq_swq_params *swq,
>  	uint32_t *pktq_in_id)
>  {
> -	struct app_pipeline_params *reader;
> +	struct app_pipeline_params *reader = NULL;
>  	uint32_t pos = swq - app->swq_params;
>  	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
>  		RTE_DIM(app->pipeline_params));
> -	uint32_t n_readers = 0, id, i;
> +	uint32_t n_readers = 0, id = 0, i;
> 
>  	for (i = 0; i < n_pipelines; i++) {
>  		struct app_pipeline_params *p = &app->pipeline_params[i];
> @@ -727,11 +753,11 @@ app_tm_get_reader(struct app_params *app,
>  	struct app_pktq_tm_params *tm,
>  	uint32_t *pktq_in_id)
>  {
> -	struct app_pipeline_params *reader;
> +	struct app_pipeline_params *reader = NULL;
>  	uint32_t pos = tm - app->tm_params;
>  	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
>  		RTE_DIM(app->pipeline_params));
> -	uint32_t n_readers = 0, id, i;
> +	uint32_t n_readers = 0, id = 0, i;
> 
>  	for (i = 0; i < n_pipelines; i++) {
>  		struct app_pipeline_params *p = &app->pipeline_params[i];
> @@ -758,6 +784,66 @@ app_tm_get_reader(struct app_params *app,
>  }
> 
>  static inline uint32_t
> +app_kni_get_readers(struct app_params *app, struct
> app_pktq_kni_params *kni)
> +{
> +	uint32_t pos = kni - app->kni_params;
> +	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
> +		RTE_DIM(app->pipeline_params));
> +	uint32_t n_readers = 0, i;
> +
> +	for (i = 0; i < n_pipelines; i++) {
> +		struct app_pipeline_params *p = &app->pipeline_params[i];
> +		uint32_t n_pktq_in = RTE_MIN(p->n_pktq_in, RTE_DIM(p-
> >pktq_in));
> +		uint32_t j;
> +
> +		for (j = 0; j < n_pktq_in; j++) {
> +			struct app_pktq_in_params *pktq = &p->pktq_in[j];
> +
> +			if ((pktq->type == APP_PKTQ_IN_KNI) &&
> +				(pktq->id == pos))
> +				n_readers++;
> +		}
> +	}
> +
> +	return n_readers;
> +}
> +
> +static inline struct app_pipeline_params *
> +app_kni_get_reader(struct app_params *app,
> +				  struct app_pktq_kni_params *kni,
> +				  uint32_t *pktq_in_id)
> +{
> +	struct app_pipeline_params *reader = NULL;
> +	uint32_t pos = kni - app->kni_params;
> +	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
> +		RTE_DIM(app->pipeline_params));
> +	uint32_t n_readers = 0, id = 0, i;
> +
> +	for (i = 0; i < n_pipelines; i++) {
> +		struct app_pipeline_params *p = &app->pipeline_params[i];
> +		uint32_t n_pktq_in = RTE_MIN(p->n_pktq_in, RTE_DIM(p-
> >pktq_in));
> +		uint32_t j;
> +
> +		for (j = 0; j < n_pktq_in; j++) {
> +			struct app_pktq_in_params *pktq = &p->pktq_in[j];
> +
> +			if ((pktq->type == APP_PKTQ_IN_KNI) &&
> +				(pktq->id == pos)) {
> +				n_readers++;
> +				reader = p;
> +				id = j;
> +			}
> +		}
> +	}
> +
> +	if (n_readers != 1)
> +		return NULL;
> +
> +	*pktq_in_id = id;
> +	return reader;
> +}
> +
> +static inline uint32_t
>  app_source_get_readers(struct app_params *app,
>  struct app_pktq_source_params *source)
>  {
> @@ -861,11 +947,11 @@ app_swq_get_writer(struct app_params *app,
>  	struct app_pktq_swq_params *swq,
>  	uint32_t *pktq_out_id)
>  {
> -	struct app_pipeline_params *writer;
> +	struct app_pipeline_params *writer = NULL;
>  	uint32_t pos = swq - app->swq_params;
>  	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
>  		RTE_DIM(app->pipeline_params));
> -	uint32_t n_writers = 0, id, i;
> +	uint32_t n_writers = 0, id = 0, i;
> 
>  	for (i = 0; i < n_pipelines; i++) {
>  		struct app_pipeline_params *p = &app->pipeline_params[i];
> @@ -923,11 +1009,11 @@ app_tm_get_writer(struct app_params *app,
>  	struct app_pktq_tm_params *tm,
>  	uint32_t *pktq_out_id)
>  {
> -	struct app_pipeline_params *writer;
> +	struct app_pipeline_params *writer = NULL;
>  	uint32_t pos = tm - app->tm_params;
>  	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
>  		RTE_DIM(app->pipeline_params));
> -	uint32_t n_writers = 0, id, i;
> +	uint32_t n_writers = 0, id = 0, i;
> 
>  	for (i = 0; i < n_pipelines; i++) {
>  		struct app_pipeline_params *p = &app->pipeline_params[i];
> @@ -939,10 +1025,73 @@ app_tm_get_writer(struct app_params *app,
>  			struct app_pktq_out_params *pktq = &p-
> >pktq_out[j];
> 
>  			if ((pktq->type == APP_PKTQ_OUT_TM) &&
> +				(pktq->id == pos)) {
> +				n_writers++;
> +				writer = p;
> +				id = j;
> +			}
> +		}
> +	}
> +
> +	if (n_writers != 1)
> +		return NULL;
> +
> +	*pktq_out_id = id;
> +	return writer;
> +}
> +
> +static inline uint32_t
> +app_kni_get_writers(struct app_params *app, struct
> app_pktq_kni_params *kni)
> +{
> +	uint32_t pos = kni - app->kni_params;
> +	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
> +		RTE_DIM(app->pipeline_params));
> +	uint32_t n_writers = 0, i;
> +
> +	for (i = 0; i < n_pipelines; i++) {
> +		struct app_pipeline_params *p = &app->pipeline_params[i];
> +		uint32_t n_pktq_out = RTE_MIN(p->n_pktq_out,
> +			RTE_DIM(p->pktq_out));
> +		uint32_t j;
> +
> +		for (j = 0; j < n_pktq_out; j++) {
> +			struct app_pktq_out_params *pktq = &p-
> >pktq_out[j];
> +
> +			if ((pktq->type == APP_PKTQ_OUT_KNI) &&
>  				(pktq->id == pos))
>  				n_writers++;
> +		}
> +	}
> +
> +	return n_writers;
> +}
> +
> +static inline struct app_pipeline_params *
> +app_kni_get_writer(struct app_params *app,
> +				  struct app_pktq_kni_params *kni,
> +				  uint32_t *pktq_out_id)
> +{
> +	struct app_pipeline_params *writer = NULL;
> +	uint32_t pos = kni - app->kni_params;
> +	uint32_t n_pipelines = RTE_MIN(app->n_pipelines,
> +		RTE_DIM(app->pipeline_params));
> +	uint32_t n_writers = 0, id = 0, i;
> +
> +	for (i = 0; i < n_pipelines; i++) {
> +		struct app_pipeline_params *p = &app->pipeline_params[i];
> +		uint32_t n_pktq_out = RTE_MIN(p->n_pktq_out,
> +			RTE_DIM(p->pktq_out));
> +		uint32_t j;
> +
> +		for (j = 0; j < n_pktq_out; j++) {
> +			struct app_pktq_out_params *pktq = &p-
> >pktq_out[j];
> +
> +			if ((pktq->type == APP_PKTQ_OUT_KNI) &&
> +				(pktq->id == pos)) {
> +				n_writers++;
>  				writer = p;
>  				id = j;
> +			}
>  		}
>  	}
> 
> @@ -1051,6 +1200,22 @@ app_get_link_for_tm(struct app_params *app,
> struct app_pktq_tm_params *p_tm)
>  	return &app->link_params[link_param_idx];
>  }
> 
> +static inline struct app_link_params *
> +app_get_link_for_kni(struct app_params *app, struct
> app_pktq_kni_params *p_kni)
> +{
> +	char link_name[APP_PARAM_NAME_SIZE];
> +	uint32_t link_id;
> +	ssize_t link_param_idx;
> +
> +	sscanf(p_kni->name, "KNI%" PRIu32, &link_id);
> +	sprintf(link_name, "LINK%" PRIu32, link_id);
> +	link_param_idx = APP_PARAM_FIND(app->link_params, link_name);
> +	APP_CHECK((link_param_idx >= 0),
> +			  "Cannot find %s for %s", link_name, p_kni->name);
> +
> +	return &app->link_params[link_param_idx];
> +}
> +
>  void app_pipeline_params_get(struct app_params *app,
>  	struct app_pipeline_params *p_in,
>  	struct pipeline_params *p_out);
> diff --git a/examples/ip_pipeline/config/kni.cfg
> b/examples/ip_pipeline/config/kni.cfg
> new file mode 100644
> index 0000000..c339080
> --- /dev/null
> +++ b/examples/ip_pipeline/config/kni.cfg
> @@ -0,0 +1,67 @@
> +;   BSD LICENSE
> +;
> +;   Copyright(c) 2016 Intel Corporation.
> +;   All rights reserved.
> +;
> +;   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 copyright
> +;       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 FOR
> +;   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 ANY
> +;   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> +;   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
> THE USE
> +;   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
> DAMAGE.
> +
> +;             ______________          ______________________
> +;            |              |  KNI0  |                      |
> +; RXQ0.0 --->|              |------->|--+                   |
> +;            |              |  KNI1  |  | br0               |
> +; TXQ0.0 <---|              |<-------|<-+                   |
> +;            | Pass-through |        |     Linux Kernel     |
> +;            |     (P1)     |        |     Network Stack    |
> +;            |              |  KNI0  |                      |
> +; RXQ0.0 --->|              |------->|--+                   |
> +;            |              |  KNI1  |  | br0               |
> +; TXQ0.0 <---|              |<-------|<-+                   |
> +;            |______________|        |______________________|
> +;

There are some errors in the diagram I previously sent you, here is the corrected version (which matches the PIPELINE1 configuration):

;             ______________          ______________________ 
;            |              |  KNI0  |                      |
; RXQ0.0 --->|              |------->|--+                   |
;            |              |  KNI1  |  | br0               |
; TXQ1.0 <---|              |<-------|<-+                   |
;            | Pass-through |        |     Linux Kernel     |
;            |     (P1)     |        |     Network Stack    |
;            |              |  KNI1  |                      |
; RXQ1.0 --->|              |------->|--+                   |
;            |              |  KNI0  |  | br0               |
; TXQ0.0 <---|              |<-------|<-+                   |
;            |______________|        |______________________|

> +; Insert Linux kernel KNI module:
> +;    [Linux]$ insmod rte_kni.ko
> +;
> +; Configure Linux kernel bridge between KNI0 and KNI1 interfaces:
> +;    [Linux]$ ifconfig KNI0 up
> +;    [Linux]$ ifconfig KNI1 up
> +;    [Linux]$ brctl addbr "br0"
> +;    [Linux]$ brctl addif br0 KNI0
> +;    [Linux]$ brctl addif br0 KNI1
> +;    [Linux]$ ifconfig br0 up
> +
> +[EAL]
> +log_level = 0
> +
> +[PIPELINE0]
> +type = MASTER
> +core = 0
> +
> +[PIPELINE1]
> +type = PASS-THROUGH
> +core = 1
> +pktq_in = RXQ0.0 KNI1 RXQ1.0 KNI0
> +pktq_out = KNI0 TXQ1.0 KNI1 TXQ0.0
> diff --git a/examples/ip_pipeline/config_check.c
> b/examples/ip_pipeline/config_check.c
> index 18f57be..7e90342 100644
> --- a/examples/ip_pipeline/config_check.c
> +++ b/examples/ip_pipeline/config_check.c
> @@ -1,7 +1,7 @@
>  /*-
>   *   BSD LICENSE
>   *
> - *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
> + *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
>   *   All rights reserved.
>   *
>   *   Redistribution and use in source and binary forms, with or without
> @@ -444,6 +444,29 @@ check_pipelines(struct app_params *app)
>  	}
>  }
> 
> +static void
> +check_knis(struct app_params *app) {
> +	uint32_t i;
> +
> +	for (i = 0; i < app->n_pktq_kni; i++) {
> +		struct app_pktq_kni_params *p = &app->kni_params[i];
> +		uint32_t n_readers = app_kni_get_readers(app, p);
> +		uint32_t n_writers = app_kni_get_writers(app, p);
> +
> +		APP_CHECK((n_readers != 0),
> +			"%s has no reader\n", p->name);
> +
> +		APP_CHECK((n_readers == 1),
> +			"%s has more than one reader\n", p->name);
> +
> +		APP_CHECK((n_writers != 0),
> +			"%s has no writer\n", p->name);
> +
> +		APP_CHECK((n_writers == 1),
> +			"%s has more than one writer\n", p->name);
> +	}
> +}

I suggest you place this function just after the check_tms() function, in order to keep consistency with our conventions.

> +
>  int
>  app_config_check(struct app_params *app)
>  {
> @@ -453,6 +476,7 @@ app_config_check(struct app_params *app)
>  	check_txqs(app);
>  	check_swqs(app);
>  	check_tms(app);
> +	check_knis(app);
>  	check_sources(app);
>  	check_sinks(app);
>  	check_msgqs(app);
> diff --git a/examples/ip_pipeline/config_parse.c
> b/examples/ip_pipeline/config_parse.c
> index 504018e..c55be31 100644
> --- a/examples/ip_pipeline/config_parse.c
> +++ b/examples/ip_pipeline/config_parse.c
> @@ -189,6 +189,18 @@ struct app_pktq_tm_params default_tm_params = {
>  	.burst_write = 32,
>  };
> 
> +struct app_pktq_kni_params default_kni_params = {
> +	.parsed = 0,
> +	.socket_id = 0,
> +	.core_id = 0,
> +	.hyper_th_id = 0,
> +	.force_bind = 0,
> +
> +	.mempool_id = 0,
> +	.burst_read = 32,
> +	.burst_write = 32,
> +};
> +
>  struct app_pktq_source_params default_source_params = {
>  	.parsed = 0,
>  	.mempool_id = 0,
> @@ -300,6 +312,18 @@ app_print_usage(char *prgname)
>  	link_param_pos;
> 	\
>  })
> 
> +#define APP_PARAM_ADD_LINK_FOR_KNI(app, kni_name)
> 	\
> +({									\
> +	char link_name[APP_PARAM_NAME_SIZE];
> 	\
> +	ssize_t link_param_pos;
> 	\
> +	uint32_t link_id;						\
> +									\
> +	sscanf((kni_name), "KNI%" SCNu32, &link_id);		\
> +	sprintf(link_name, "LINK%" PRIu32, link_id);			\
> +	link_param_pos = APP_PARAM_ADD((app)->link_params,
> link_name);	\
> +	link_param_pos;
> 	\
> +})
> +
>  #define PARSE_CHECK_DUPLICATE_SECTION(obj)
> 	\
>  do {									\
>  	APP_CHECK(((obj)->parsed == 0),
> 	\
> @@ -826,6 +850,10 @@ parse_pipeline_pktq_in(struct app_params *app,
>  			type = APP_PKTQ_IN_TM;
>  			id = APP_PARAM_ADD(app->tm_params, name);
>  			APP_PARAM_ADD_LINK_FOR_TM(app, name);
> +		} else if (validate_name(name, "KNI", 1) == 0) {
> +			type = APP_PKTQ_IN_KNI;
> +			id = APP_PARAM_ADD(app->kni_params, name);
> +			APP_PARAM_ADD_LINK_FOR_KNI(app, name);
>  		} else if (validate_name(name, "SOURCE", 1) == 0) {
>  			type = APP_PKTQ_IN_SOURCE;
>  			id = APP_PARAM_ADD(app->source_params, name);
> @@ -871,6 +899,10 @@ parse_pipeline_pktq_out(struct app_params *app,
>  			type = APP_PKTQ_OUT_TM;
>  			id = APP_PARAM_ADD(app->tm_params, name);
>  			APP_PARAM_ADD_LINK_FOR_TM(app, name);
> +		} else if (validate_name(name, "KNI", 1) == 0) {
> +			type = APP_PKTQ_OUT_KNI;
> +			id = APP_PARAM_ADD(app->kni_params, name);
> +			APP_PARAM_ADD_LINK_FOR_KNI(app, name);
>  		} else if (validate_name(name, "SINK", 1) == 0) {
>  			type = APP_PKTQ_OUT_SINK;
>  			id = APP_PARAM_ADD(app->sink_params, name);
> @@ -1816,7 +1848,7 @@ parse_tm(struct app_params *app,
>  	param = &app->tm_params[param_idx];
>  	PARSE_CHECK_DUPLICATE_SECTION(param);
> 
> -	APP_PARAM_ADD_LINK_FOR_TXQ(app, section_name);
> +	APP_PARAM_ADD_LINK_FOR_TM(app, section_name);
> 
>  	for (i = 0; i < n_entries; i++) {
>  		struct rte_cfgfile_entry *ent = &entries[i];
> @@ -1853,6 +1885,85 @@ parse_tm(struct app_params *app,
>  }
> 
>  static void
> +parse_kni(struct app_params *app,
> +		  const char *section_name,
> +		  struct rte_cfgfile *cfg)
> +{
> +	struct app_pktq_kni_params *param;
> +	struct rte_cfgfile_entry *entries;
> +	int n_entries, i;
> +	ssize_t param_idx;
> +
> +	n_entries = rte_cfgfile_section_num_entries(cfg, section_name);
> +	PARSE_ERROR_SECTION_NO_ENTRIES((n_entries > 0),
> section_name);
> +
> +	entries = malloc(n_entries * sizeof(struct rte_cfgfile_entry));
> +	PARSE_ERROR_MALLOC(entries != NULL);
> +
> +	rte_cfgfile_section_entries(cfg, section_name, entries, n_entries);
> +
> +	param_idx = APP_PARAM_ADD(app->kni_params, section_name);
> +	param = &app->kni_params[param_idx];
> +	PARSE_CHECK_DUPLICATE_SECTION(param);
> +
> +	APP_PARAM_ADD_LINK_FOR_KNI(app, section_name);
> +
> +
> +	for (i = 0; i < n_entries; i++) {
> +		struct rte_cfgfile_entry *ent = &entries[i];
> +
> +		if (strcmp(ent->name, "core") == 0) {
> +			int status = parse_pipeline_core(
> +					&param->socket_id,
> +					&param->core_id,
> +					&param->hyper_th_id,
> +					ent->value);
> +
> +			PARSE_ERROR((status == 0), section_name,
> +						ent->name);
> +			param->force_bind = 1;
> +			continue;
> +		}
> +
> +		if (strcmp(ent->name, "mempool") == 0) {
> +			int status = validate_name(ent->value,
> +
> "MEMPOOL", 1);
> +			ssize_t idx;
> +
> +			PARSE_ERROR((status == 0), section_name,
> +						ent->name);
> +
> +			idx = APP_PARAM_ADD(app->mempool_params,
> ent->value);
> +			param->mempool_id = idx;
> +			continue;
> +		}
> +
> +		if (strcmp(ent->name, "burst_read") == 0) {
> +			int status = parser_read_uint32(&param-
> >burst_read,
> +
> 		ent->value);
> +
> +			PARSE_ERROR((status == 0), section_name,
> +						ent->name);
> +			continue;
> +		}
> +
> +		if (strcmp(ent->name, "burst_write") == 0) {
> +			int status = parser_read_uint32(&param-
> >burst_write,
> +
> 		ent->value);
> +
> +			PARSE_ERROR((status == 0), section_name,
> +						ent->name);
> +			continue;
> +		}
> +
> +		/* unrecognized */
> +		PARSE_ERROR_INVALID(0, section_name, ent->name);
> +	}
> +

Here is one bug for you, you need to make sure you add the following line here:
	param->parsed = 1;

> +	free(entries);
> +}
> +
> +static void
>  parse_source(struct app_params *app,
>  	const char *section_name,
>  	struct rte_cfgfile *cfg)
> @@ -2147,6 +2258,7 @@ static const struct config_section cfg_file_scheme[]
> = {
>  	{"TXQ", 2, parse_txq},
>  	{"SWQ", 1, parse_swq},
>  	{"TM", 1, parse_tm},
> +	{"KNI", 1, parse_kni},
>  	{"SOURCE", 1, parse_source},
>  	{"SINK", 1, parse_sink},
>  	{"MSGQ-REQ-PIPELINE", 1, parse_msgq_req_pipeline},
> @@ -2285,6 +2397,7 @@ app_config_parse(struct app_params *app, const
> char *file_name)
>  	APP_PARAM_COUNT(app->hwq_out_params, app-
> >n_pktq_hwq_out);
>  	APP_PARAM_COUNT(app->swq_params, app->n_pktq_swq);
>  	APP_PARAM_COUNT(app->tm_params, app->n_pktq_tm);
> +	APP_PARAM_COUNT(app->kni_params, app->n_pktq_kni);
>  	APP_PARAM_COUNT(app->source_params, app->n_pktq_source);
>  	APP_PARAM_COUNT(app->sink_params, app->n_pktq_sink);
>  	APP_PARAM_COUNT(app->msgq_params, app->n_msgq);
> @@ -2647,6 +2760,45 @@ save_tm_params(struct app_params *app, FILE
> *f)
>  }
> 
>  static void
> +save_kni_params(struct app_params *app, FILE *f)
> +{
> +	struct app_pktq_kni_params *p;
> +	size_t i, count;
> +
> +	count = RTE_DIM(app->kni_params);
> +	for (i = 0; i < count; i++) {
> +		p = &app->kni_params[i];
> +		if (!APP_PARAM_VALID(p))
> +			continue;
> +
> +		/* section name */
> +		fprintf(f, "[%s]\n", p->name);
> +
> +		/* core */
> +		if (p->force_bind) {
> +			fprintf(f, "; force_bind = 1\n");
> +			fprintf(f, "core = s%" PRIu32 "c%" PRIu32 "%s\n",
> +					p->socket_id,
> +					p->core_id,
> +					(p->hyper_th_id) ? "h" : "");
> +		} else
> +			fprintf(f, "; force_bind = 0\n");
> +
> +		/* mempool */
> +		fprintf(f, "%s = %s\n", "mempool",
> +				app->mempool_params[p-
> >mempool_id].name);
> +
> +		/* burst_read */
> +		fprintf(f, "%s = %" PRIu32 "\n", "burst_read", p-
> >burst_read);
> +
> +		/* burst_write */
> +		fprintf(f, "%s = %" PRIu32 "\n", "burst_write", p-
> >burst_write);
> +
> +		fputc('\n', f);
> +	}
> +}
> +
> +static void
>  save_source_params(struct app_params *app, FILE *f)
>  {
>  	struct app_pktq_source_params *p;
> @@ -2753,6 +2905,9 @@ save_pipeline_params(struct app_params *app,
> FILE *f)
>  				case APP_PKTQ_IN_TM:
>  					name = app->tm_params[pp-
> >id].name;
>  					break;
> +				case APP_PKTQ_IN_KNI:
> +					name = app->kni_params[pp-
> >id].name;
> +					break;
>  				case APP_PKTQ_IN_SOURCE:
>  					name = app->source_params[pp-
> >id].name;
>  					break;
> @@ -2787,6 +2942,9 @@ save_pipeline_params(struct app_params *app,
> FILE *f)
>  				case APP_PKTQ_OUT_TM:
>  					name = app->tm_params[pp-
> >id].name;
>  					break;
> +				case APP_PKTQ_OUT_KNI:
> +					name = app->kni_params[pp-
> >id].name;
> +					break;
>  				case APP_PKTQ_OUT_SINK:
>  					name = app->sink_params[pp-
> >id].name;
>  					break;
> @@ -2872,6 +3030,7 @@ app_config_save(struct app_params *app, const
> char *file_name)
>  	save_txq_params(app, file);
>  	save_swq_params(app, file);
>  	save_tm_params(app, file);
> +	save_kni_params(app, file);
>  	save_source_params(app, file);
>  	save_sink_params(app, file);
>  	save_msgq_params(app, file);
> @@ -2921,6 +3080,11 @@ app_config_init(struct app_params *app)
>  			&default_tm_params,
>  			sizeof(default_tm_params));
> 
> +	for (i = 0; i < RTE_DIM(app->kni_params); i++)
> +		memcpy(&app->kni_params[i],
> +			   &default_kni_params,
> +			   sizeof(default_kni_params));
> +
>  	for (i = 0; i < RTE_DIM(app->source_params); i++)
>  		memcpy(&app->source_params[i],
>  			&default_source_params,
> diff --git a/examples/ip_pipeline/init.c b/examples/ip_pipeline/init.c

In order to keep up with our existing code conventions, please move the KNI code (functions kni_change_mtu(), kni_config_network_interface(), app_init_kni()) just after function app_init_tm().

> index 7120bab..d522de4 100644
> --- a/examples/ip_pipeline/init.c
> +++ b/examples/ip_pipeline/init.c
> @@ -1281,10 +1281,21 @@ void app_pipeline_params_get(struct
> app_params *app,
>  			break;
>  		}
>  		case APP_PKTQ_IN_TM:
> +		{
>  			out->type = PIPELINE_PORT_IN_SCHED_READER;
>  			out->params.sched.sched = app->tm[in->id];
>  			out->burst_size = app->tm_params[in-
> >id].burst_read;
>  			break;
> +		}
> +#ifdef RTE_LIBRTE_KNI
> +		case APP_PKTQ_IN_KNI:
> +		{
> +			out->type = PIPELINE_PORT_IN_KNI_READER;
> +			out->params.kni.kni = app->kni[in->id];
> +			out->burst_size = app->kni_params[in-
> >id].burst_read;
> +			break;
> +		}
> +#endif /* RTE_LIBRTE_KNI */
>  		case APP_PKTQ_IN_SOURCE:
>  		{
>  			uint32_t mempool_id =
> @@ -1409,7 +1420,8 @@ void app_pipeline_params_get(struct app_params
> *app,
>  			}
>  			break;
>  		}
> -		case APP_PKTQ_OUT_TM: {
> +		case APP_PKTQ_OUT_TM:
> +		{
>  			struct rte_port_sched_writer_params *params =
>  				&out->params.sched;
> 
> @@ -1419,6 +1431,16 @@ void app_pipeline_params_get(struct
> app_params *app,
>  				app->tm_params[in->id].burst_write;
>  			break;
>  		}
> +#ifdef RTE_LIBRTE_KNI
> +		case APP_PKTQ_OUT_KNI:
> +		{
> +			out->type = PIPELINE_PORT_OUT_KNI_WRITER;
> +			out->params.kni.kni = app->kni[in->id];
> +			out->params.kni.tx_burst_sz =
> +				app->kni_params[in->id].burst_write;
> +			break;
> +		}
> +#endif /* RTE_LIBRTE_KNI */
>  		case APP_PKTQ_OUT_SINK:
>  		{
>  			out->type = PIPELINE_PORT_OUT_SINK;
> @@ -1452,6 +1474,113 @@ void app_pipeline_params_get(struct
> app_params *app,
>  	}
>  }
> 
> +#ifdef RTE_LIBRTE_KNI
> +static int
> +kni_config_network_interface(uint8_t port_id, uint8_t if_up) {
> +	int ret = 0;
> +
> +	if (port_id >= rte_eth_dev_count())
> +		return -EINVAL;
> +
> +	if (if_up) {
> +		rte_eth_dev_stop(port_id);
> +		ret = rte_eth_dev_start(port_id);
> +	} else
> +		rte_eth_dev_stop(port_id);
> +
> +	return ret;
> +}
> +

Here is a critical issue that we found out recently during testing the KNI code: the correct PMD API functions to use here are rte_eth_dev_set_link_up/down(); stopping and restarting the device while the device is running can lead to segfault and nondeterministic behaviour.

Here is my proposal:

static int
kni_config_network_interface(uint8_t port_id, uint8_t if_up) {
	int ret = 0;

	if (port_id >= rte_eth_dev_count())
		return -EINVAL;

	ret = (if_up)?
		rte_eth_dev_set_link_up(port_id) :
		rte_eth_dev_set_link_down(port_id);

	return ret;
}

I tested this function successfully.

> +static int
> +kni_change_mtu(uint8_t port_id, unsigned new_mtu) {
> +	int ret;
> +
> +	if (port_id >= rte_eth_dev_count())
> +		return -EINVAL;
> +
> +	if (new_mtu > ETHER_MAX_LEN)
> +		return -EINVAL;
> +
> +	/* Stop specific port */
> +	rte_eth_dev_stop(port_id);
> +
> +	/* Set new MTU */
> +	ret = rte_eth_dev_set_mtu(port_id, new_mtu);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Restart specific port */
> +	ret = rte_eth_dev_start(port_id);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}

Same issue about using the rte_eth_dev_start/stop() functions. Based on function port_mtu_set() of the app/test-pmd application, it looks like rte_eth_dev_set_mtu() function could be called directly with no start/stop or up/down preparations.

Here is my version, although I did not fully test this one:

static int
kni_change_mtu(uint8_t port_id, unsigned new_mtu) {
	int ret;

	if (port_id >= rte_eth_dev_count())
		return -EINVAL;

	if (new_mtu > ETHER_MAX_LEN)
		return -EINVAL;

	/* Set new MTU */
	ret = rte_eth_dev_set_mtu(port_id, new_mtu);
	if (ret < 0)
		return ret;

	return 0;
}

> +#endif /* RTE_LIBRTE_KNI */
> +
> +static void
> +app_init_kni(struct app_params *app) {
> +	if (app->n_pktq_kni == 0)
> +		return;
> +#ifndef RTE_LIBRTE_KNI
> +	else
> +		rte_panic("Can not init KNI without librte_kni support.\n");
> +#else

I would like to avoid #ifdefs in the middle of the function code as much as possible. I suggest we do the following:

#ifndef RTE_LIBRTE_KNI

static void
app_init_kni(struct app_params *app)
{
	if (app->n_pktq_kni == 0)
		return;

	rte_panic("Cannot init KNI without librte_kni support.\n");
}

#else

static void
app_init_kni(struct app_params *app)
{
	//the real function code
}

#endif

> +	rte_kni_init(app->n_pktq_kni);
> +
> +	for (uint32_t i = 0; i < app->n_pktq_kni; i++) {

Please declare the "i" variable at the start of the function, as usual. Although I personally like this idea, this pattern is not used anywhere in DPDK and it might trigger warnings/errors from some C compilers. Btw, any idea whether this is mentioned in any way by the ANSI C/C99 standards?

> +		struct app_pktq_kni_params *p_kni = &app->kni_params[i];
> +		struct app_link_params *p_link;
> +		struct rte_eth_dev_info dev_info;
> +		struct app_mempool_params *mempool_params;
> +		struct rte_mempool *mempool;
> +		struct rte_kni_conf conf;
> +		struct rte_kni_ops ops;
> +
> +		/* LINK */
> +		p_link = app_get_link_for_kni(app, p_kni);
> +		memset(&dev_info, 0, sizeof(dev_info));
> +		rte_eth_dev_info_get(p_link->pmd_id, &dev_info);
> +
> +		/* MEMPOOL */
> +		mempool_params = &app->mempool_params[p_kni-
> >mempool_id];
> +		mempool = app->mempool[p_kni->mempool_id];
> +
> +		/* KNI */
> +		memset(&conf, 0, sizeof(conf));
> +		snprintf(conf.name, RTE_KNI_NAMESIZE, "%s", p_kni-
> >name);
> +		conf.force_bind = p_kni->force_bind;
> +		if (conf.force_bind) {
> +			int lcore_id;
> +
> +			lcore_id = cpu_core_map_get_lcore_id(app-
> >core_map,
> +				p_kni->socket_id,
> +				p_kni->core_id,
> +				p_kni->hyper_th_id);
> +
> +			if (lcore_id < 0)
> +				rte_panic("%s invalid CPU core\n", p_kni-
> >name);
> +
> +			conf.core_id = (uint32_t) lcore_id;
> +		}
> +		conf.group_id = p_link->pmd_id;
> +		conf.mbuf_size = mempool_params->buffer_size;
> +		conf.addr = dev_info.pci_dev->addr;
> +		conf.id = dev_info.pci_dev->id;
> +
> +		memset(&ops, 0, sizeof(ops));
> +		ops.port_id = (uint8_t) p_link->pmd_id;
> +		ops.change_mtu = kni_change_mtu;
> +		ops.config_network_if = kni_config_network_interface;
> +
> +		APP_LOG(app, HIGH, "Initializing %s ...", p_kni->name);
> +		app->kni[i] = rte_kni_alloc(mempool, &conf, &ops);
> +		if (!app->kni[i])
> +			rte_panic("%s init error\n", p_kni->name);
> +	}
> +#endif /* RTE_LIBRTE_KNI */
> +}
> +
>  static void
>  app_init_pipelines(struct app_params *app)
>  {
> @@ -1607,6 +1736,7 @@ int app_init(struct app_params *app)
>  	app_init_link(app);
>  	app_init_swq(app);
>  	app_init_tm(app);
> +	app_init_kni(app);
>  	app_init_msgq(app);
> 
>  	app_pipeline_common_cmd_push(app);
> diff --git a/examples/ip_pipeline/pipeline/pipeline_common_fe.c
> b/examples/ip_pipeline/pipeline/pipeline_common_fe.c
> index 70c57e4..63723cd 100644
> --- a/examples/ip_pipeline/pipeline/pipeline_common_fe.c
> +++ b/examples/ip_pipeline/pipeline/pipeline_common_fe.c
> @@ -130,6 +130,35 @@ app_pipeline_track_pktq_out_to_link(struct
> app_params *app,
>  			break;
>  		}
> 
> +#ifdef RTE_LIBRTE_KNI

As in any other place that just deals with KNI configuration data rather than KNI init data (e.g. in app.h or config_parse.c), we do not need to #ifdef the code fragment below. Please remove this instance of #ifdef RTE_LIBRTE_KNI.

> +		case APP_PKTQ_OUT_KNI:
> +		{
> +			struct pipeline_params pp;
> +			struct pipeline_type *ptype;
> +			struct app_pktq_kni_params *kni;
> +			uint32_t pktq_in_id;
> +			int status;
> +
> +			kni = &app->kni_params[pktq_out->id];
> +			p = app_kni_get_reader(app, kni, &pktq_in_id);
> +			if (p == NULL)
> +				return NULL;
> +
> +			ptype = app_pipeline_type_find(app, p->type);
> +			if ((ptype == NULL) || (ptype->fe_ops->f_track ==
> NULL))
> +				return NULL;
> +
> +			app_pipeline_params_get(app, p, &pp);
> +			status = ptype->fe_ops->f_track(&pp,
> +				pktq_in_id,
> +				&pktq_out_id);
> +			if (status)
> +				return NULL;
> +
> +			break;
> +		}
> +#endif
> +
>  		case APP_PKTQ_OUT_SINK:
>  		default:
>  			return NULL;
> diff --git a/examples/ip_pipeline/pipeline/pipeline_master_be.c
> b/examples/ip_pipeline/pipeline/pipeline_master_be.c
> index 79869a4..32d4635 100644
> --- a/examples/ip_pipeline/pipeline/pipeline_master_be.c
> +++ b/examples/ip_pipeline/pipeline/pipeline_master_be.c
> @@ -144,6 +144,12 @@ pipeline_run(void *pipeline)
>  		rte_exit(0, "Bye!\n");
>  	}
> 
> +#ifdef RTE_LIBRTE_KNI
> +	/* Handle KNI requests from Linux kernel */
> +	for (uint32_t i = 0; i < app->n_pktq_kni; i++)

Same comment as above on definition of the "i" variable.

> +		rte_kni_handle_request(app->kni[i]);
> +#endif /* RTE_LIBRTE_KNI */
> +
>  	return 0;
>  }
> 
> diff --git a/examples/ip_pipeline/pipeline_be.h
> b/examples/ip_pipeline/pipeline_be.h
> index 5501ab7..0ee208c 100644
> --- a/examples/ip_pipeline/pipeline_be.h
> +++ b/examples/ip_pipeline/pipeline_be.h
> @@ -40,6 +40,9 @@
>  #include <rte_port_ras.h>
>  #include <rte_port_sched.h>
>  #include <rte_port_source_sink.h>
> +#ifdef RTE_LIBRTE_KNI
> +#include <rte_port_kni.h>
> +#endif
>  #include <rte_pipeline.h>
> 
>  enum pipeline_port_in_type {
> @@ -49,6 +52,7 @@ enum pipeline_port_in_type {
>  	PIPELINE_PORT_IN_RING_READER_IPV4_FRAG,
>  	PIPELINE_PORT_IN_RING_READER_IPV6_FRAG,
>  	PIPELINE_PORT_IN_SCHED_READER,
> +	PIPELINE_PORT_IN_KNI_READER,
>  	PIPELINE_PORT_IN_SOURCE,
>  };
> 
> @@ -61,6 +65,9 @@ struct pipeline_port_in_params {
>  		struct rte_port_ring_reader_ipv4_frag_params
> ring_ipv4_frag;
>  		struct rte_port_ring_reader_ipv6_frag_params
> ring_ipv6_frag;
>  		struct rte_port_sched_reader_params sched;
> +#ifdef RTE_LIBRTE_KNI
> +		struct rte_port_kni_reader_params kni;
> +#endif
>  		struct rte_port_source_params source;
>  	} params;
>  	uint32_t burst_size;
> @@ -82,6 +89,10 @@ pipeline_port_in_params_convert(struct
> pipeline_port_in_params  *p)
>  		return (void *) &p->params.ring_ipv6_frag;
>  	case PIPELINE_PORT_IN_SCHED_READER:
>  		return (void *) &p->params.sched;
> +#ifdef RTE_LIBRTE_KNI
> +	case PIPELINE_PORT_IN_KNI_READER:
> +		return (void *) &p->params.kni;
> +#endif
>  	case PIPELINE_PORT_IN_SOURCE:
>  		return (void *) &p->params.source;
>  	default:
> @@ -105,6 +116,10 @@ pipeline_port_in_params_get_ops(struct
> pipeline_port_in_params  *p)
>  		return &rte_port_ring_reader_ipv6_frag_ops;
>  	case PIPELINE_PORT_IN_SCHED_READER:
>  		return &rte_port_sched_reader_ops;
> +#ifdef RTE_LIBRTE_KNI
> +	case PIPELINE_PORT_IN_KNI_READER:
> +		return &rte_port_kni_reader_ops;
> +#endif
>  	case PIPELINE_PORT_IN_SOURCE:
>  		return &rte_port_source_ops;
>  	default:
> @@ -122,6 +137,7 @@ enum pipeline_port_out_type {
>  	PIPELINE_PORT_OUT_RING_WRITER_IPV4_RAS,
>  	PIPELINE_PORT_OUT_RING_WRITER_IPV6_RAS,
>  	PIPELINE_PORT_OUT_SCHED_WRITER,
> +	PIPELINE_PORT_OUT_KNI_WRITER,
>  	PIPELINE_PORT_OUT_SINK,
>  };
> 
> @@ -137,6 +153,9 @@ struct pipeline_port_out_params {
>  		struct rte_port_ring_writer_ipv4_ras_params ring_ipv4_ras;
>  		struct rte_port_ring_writer_ipv6_ras_params ring_ipv6_ras;
>  		struct rte_port_sched_writer_params sched;
> +#ifdef RTE_LIBRTE_KNI
> +		struct rte_port_kni_writer_params kni;
> +#endif
>  		struct rte_port_sink_params sink;
>  	} params;
>  };
> @@ -163,6 +182,10 @@ pipeline_port_out_params_convert(struct
> pipeline_port_out_params  *p)
>  		return (void *) &p->params.ring_ipv6_ras;
>  	case PIPELINE_PORT_OUT_SCHED_WRITER:
>  		return (void *) &p->params.sched;
> +#ifdef RTE_LIBRTE_KNI
> +	case PIPELINE_PORT_OUT_KNI_WRITER:
> +		return (void *) &p->params.kni;
> +#endif
>  	case PIPELINE_PORT_OUT_SINK:
>  		return (void *) &p->params.sink;
>  	default:
> @@ -192,6 +215,10 @@ pipeline_port_out_params_get_ops(struct
> pipeline_port_out_params  *p)
>  		return &rte_port_ring_writer_ipv6_ras_ops;
>  	case PIPELINE_PORT_OUT_SCHED_WRITER:
>  		return &rte_port_sched_writer_ops;
> +#ifdef RTE_LIBRTE_KNI
> +	case PIPELINE_PORT_OUT_KNI_WRITER:
> +		return &rte_port_kni_writer_ops;
> +#endif
>  	case PIPELINE_PORT_OUT_SINK:
>  		return &rte_port_sink_ops;
>  	default:
> diff --git a/lib/librte_port/Makefile b/lib/librte_port/Makefile
> index dc6a601..0fc929b 100644
> --- a/lib/librte_port/Makefile
> +++ b/lib/librte_port/Makefile
> @@ -56,6 +56,9 @@ SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_frag.c
>  SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_ras.c
>  endif
>  SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_sched.c
> +ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
> +SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_kni.c
> +endif
>  SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_source_sink.c
> 
>  # install includes
> @@ -67,6 +70,9 @@ SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include +=
> rte_port_frag.h
>  SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_ras.h
>  endif
>  SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_sched.h
> +ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
> +SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_kni.h
> +endif
>  SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_source_sink.h
> 
>  # this lib depends upon:
> @@ -76,5 +82,6 @@ DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) +=
> lib/librte_mempool
>  DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_ether
>  DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_ip_frag
>  DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_sched
> +DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_kni
> 
>  include $(RTE_SDK)/mk/rte.lib.mk
> diff --git a/lib/librte_port/rte_port_kni.c b/lib/librte_port/rte_port_kni.c
> new file mode 100644
> index 0000000..4cbc345
> --- /dev/null
> +++ b/lib/librte_port/rte_port_kni.c
> @@ -0,0 +1,325 @@
> +/*-
> + *   BSD LICENSE
> + *
> + *   Copyright(c) 2016 Ethan Zhuang <zhuangwj@gmail.com>.
> + *   Copyright(c) 2016 Intel Corporation.
> + *   All rights reserved.
> + *
> + *   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 copyright
> + *       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 FOR
> + *   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 ANY
> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
> TORT
> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
> THE USE
> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
> DAMAGE.
> + */
> +#include <string.h>
> +
> +#include <rte_common.h>
> +#include <rte_malloc.h>
> +#include <rte_kni.h>
> +
> +#include "rte_port_kni.h"
> +
> +/*
> + * Port KNI Reader
> + */
> +#ifdef RTE_PORT_STATS_COLLECT
> +
> +#define RTE_PORT_KNI_READER_STATS_PKTS_IN_ADD(port, val) \
> +	port->stats.n_pkts_in += val
> +#define RTE_PORT_KNI_READER_STATS_PKTS_DROP_ADD(port, val) \
> +	port->stats.n_pkts_drop += val
> +
> +#else
> +
> +#define RTE_PORT_KNI_READER_STATS_PKTS_IN_ADD(port, val)
> +#define RTE_PORT_KNI_READER_STATS_PKTS_DROP_ADD(port, val)
> +
> +#endif
> +
> +struct rte_port_kni_reader {
> +	struct rte_port_in_stats stats;
> +
> +	struct rte_kni *kni;
> +};
> +
> +static void *
> +rte_port_kni_reader_create(void *params, int socket_id)
> +{
> +	struct rte_port_kni_reader_params *conf =
> +			(struct rte_port_kni_reader_params *) params;
> +	struct rte_port_kni_reader *port;
> +
> +	/* Check input parameters */
> +	if (conf == NULL) {
> +		RTE_LOG(ERR, PORT, "%s: params is NULL\n", __func__);
> +		return NULL;
> +	}
> +
> +	/* Memory allocation */
> +	port = rte_zmalloc_socket("PORT", sizeof(*port),
> +		RTE_CACHE_LINE_SIZE, socket_id);
> +	if (port == NULL) {
> +		RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n",
> __func__);
> +		return NULL;
> +	}
> +
> +	/* Initialization */
> +	port->kni = conf->kni;
> +
> +	return port;
> +}
> +
> +static int
> +rte_port_kni_reader_rx(void *port, struct rte_mbuf **pkts, uint32_t
> n_pkts)
> +{
> +	struct rte_port_kni_reader *p =
> +			(struct rte_port_kni_reader *) port;
> +	uint16_t rx_pkt_cnt;
> +
> +	rx_pkt_cnt = rte_kni_rx_burst(p->kni, pkts, n_pkts);
> +	RTE_PORT_KNI_READER_STATS_PKTS_IN_ADD(p, rx_pkt_cnt);
> +	return rx_pkt_cnt;
> +}
> +
> +static int
> +rte_port_kni_reader_free(void *port)
> +{
> +	if (port == NULL) {
> +		RTE_LOG(ERR, PORT, "%s: port is NULL\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	rte_free(port);
> +
> +	return 0;
> +}
> +
> +static int rte_port_kni_reader_stats_read(void *port,
> +	struct rte_port_in_stats *stats, int clear)
> +{
> +	struct rte_port_kni_reader *p =
> +			(struct rte_port_kni_reader *) port;
> +
> +	if (stats != NULL)
> +		memcpy(stats, &p->stats, sizeof(p->stats));
> +
> +	if (clear)
> +		memset(&p->stats, 0, sizeof(p->stats));
> +
> +	return 0;
> +}
> +
> +/*
> + * Port KNI Writer
> + */
> +#ifdef RTE_PORT_STATS_COLLECT
> +
> +#define RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(port, val) \
> +	port->stats.n_pkts_in += val
> +#define RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(port, val) \
> +	port->stats.n_pkts_drop += val
> +
> +#else
> +
> +#define RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(port, val)
> +#define RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(port, val)
> +
> +#endif
> +
> +struct rte_port_kni_writer {
> +	struct rte_port_out_stats stats;
> +
> +	struct rte_mbuf *tx_buf[2 * RTE_PORT_IN_BURST_SIZE_MAX];
> +	uint32_t tx_burst_sz;
> +	uint32_t tx_buf_count;
> +	uint64_t bsz_mask;
> +	struct rte_kni *kni;
> +};
> +
> +static void *
> +rte_port_kni_writer_create(void *params, int socket_id)
> +{
> +	struct rte_port_kni_writer_params *conf =
> +			(struct rte_port_kni_writer_params *) params;
> +	struct rte_port_kni_writer *port;
> +
> +	/* Check input parameters */
> +	if ((conf == NULL) ||
> +		(conf->tx_burst_sz == 0) ||
> +		(conf->tx_burst_sz > RTE_PORT_IN_BURST_SIZE_MAX) ||
> +		(!rte_is_power_of_2(conf->tx_burst_sz))) {
> +		RTE_LOG(ERR, PORT, "%s: Invalid input parameters\n",
> __func__);
> +		return NULL;
> +	}
> +
> +	/* Memory allocation */
> +	port = rte_zmalloc_socket("PORT", sizeof(*port),
> +		RTE_CACHE_LINE_SIZE, socket_id);
> +	if (port == NULL) {
> +		RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n",
> __func__);
> +		return NULL;
> +	}
> +
> +	/* Initialization */
> +	port->kni = conf->kni;
> +	port->tx_burst_sz = conf->tx_burst_sz;
> +	port->tx_buf_count = 0;
> +	port->bsz_mask = 1LLU << (conf->tx_burst_sz - 1);
> +
> +	return port;
> +}
> +
> +static inline void
> +send_burst(struct rte_port_kni_writer *p)
> +{
> +	uint32_t nb_tx;
> +
> +	nb_tx = rte_kni_tx_burst(p->kni, p->tx_buf, p->tx_buf_count);
> +
> +	RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(p, p-
> >tx_buf_count - nb_tx);
> +	for (; nb_tx < p->tx_buf_count; nb_tx++)
> +		rte_pktmbuf_free(p->tx_buf[nb_tx]);
> +
> +	p->tx_buf_count = 0;
> +}
> +
> +static int
> +rte_port_kni_writer_tx(void *port, struct rte_mbuf *pkt)
> +{
> +	struct rte_port_kni_writer *p =
> +			(struct rte_port_kni_writer *) port;
> +
> +	p->tx_buf[p->tx_buf_count++] = pkt;
> +	RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, 1);
> +	if (p->tx_buf_count >= p->tx_burst_sz)
> +		send_burst(p);
> +
> +	return 0;
> +}
> +
> +static int
> +rte_port_kni_writer_tx_bulk(void *port,
> +	struct rte_mbuf **pkts,
> +	uint64_t pkts_mask)
> +{
> +	struct rte_port_kni_writer *p =
> +			(struct rte_port_kni_writer *) port;
> +	uint64_t bsz_mask = p->bsz_mask;
> +	uint32_t tx_buf_count = p->tx_buf_count;
> +	uint64_t expr = (pkts_mask & (pkts_mask + 1)) |
> +					((pkts_mask & bsz_mask) ^
> bsz_mask);
> +
> +	if (expr == 0) {
> +		uint64_t n_pkts = __builtin_popcountll(pkts_mask);
> +		uint32_t n_pkts_ok;
> +
> +		if (tx_buf_count)
> +			send_burst(p);
> +
> +		RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, n_pkts);
> +		n_pkts_ok = rte_kni_tx_burst(p->kni, pkts, n_pkts);
> +
> +		RTE_PORT_KNI_WRITER_STATS_PKTS_DROP_ADD(p, n_pkts
> - n_pkts_ok);
> +		for (; n_pkts_ok < n_pkts; n_pkts_ok++) {
> +			struct rte_mbuf *pkt = pkts[n_pkts_ok];
> +
> +			rte_pktmbuf_free(pkt);
> +		}
> +	} else {
> +		for (; pkts_mask;) {
> +			uint32_t pkt_index = __builtin_ctzll(pkts_mask);
> +			uint64_t pkt_mask = 1LLU << pkt_index;
> +			struct rte_mbuf *pkt = pkts[pkt_index];
> +
> +			p->tx_buf[tx_buf_count++] = pkt;
> +			RTE_PORT_KNI_WRITER_STATS_PKTS_IN_ADD(p, 1);
> +			pkts_mask &= ~pkt_mask;
> +		}
> +
> +		p->tx_buf_count = tx_buf_count;
> +		if (tx_buf_count >= p->tx_burst_sz)
> +			send_burst(p);
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +rte_port_kni_writer_flush(void *port)
> +{
> +	struct rte_port_kni_writer *p =
> +			(struct rte_port_kni_writer *) port;
> +
> +	if (p->tx_buf_count > 0)
> +		send_burst(p);
> +
> +	return 0;
> +}
> +
> +static int
> +rte_port_kni_writer_free(void *port)
> +{
> +	if (port == NULL) {
> +		RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	rte_port_kni_writer_flush(port);
> +	rte_free(port);
> +
> +	return 0;
> +}
> +
> +static int rte_port_kni_writer_stats_read(void *port,
> +	struct rte_port_out_stats *stats, int clear)
> +{
> +	struct rte_port_kni_writer *p =
> +			(struct rte_port_kni_writer *) port;
> +
> +	if (stats != NULL)
> +		memcpy(stats, &p->stats, sizeof(p->stats));
> +
> +	if (clear)
> +		memset(&p->stats, 0, sizeof(p->stats));
> +
> +	return 0;
> +}
> +
> +/*
> + * Summary of port operations
> + */
> +struct rte_port_in_ops rte_port_kni_reader_ops = {
> +	.f_create = rte_port_kni_reader_create,
> +	.f_free = rte_port_kni_reader_free,
> +	.f_rx = rte_port_kni_reader_rx,
> +	.f_stats = rte_port_kni_reader_stats_read,
> +};
> +
> +struct rte_port_out_ops rte_port_kni_writer_ops = {
> +	.f_create = rte_port_kni_writer_create,
> +	.f_free = rte_port_kni_writer_free,
> +	.f_tx = rte_port_kni_writer_tx,
> +	.f_tx_bulk = rte_port_kni_writer_tx_bulk,
> +	.f_flush = rte_port_kni_writer_flush,
> +	.f_stats = rte_port_kni_writer_stats_read,
> +};
> diff --git a/lib/librte_port/rte_port_kni.h b/lib/librte_port/rte_port_kni.h
> new file mode 100644
> index 0000000..d4de8c4
> --- /dev/null
> +++ b/lib/librte_port/rte_port_kni.h
> @@ -0,0 +1,82 @@
> +/*-
> + *   BSD LICENSE
> + *
> + *   Copyright(c) 2016 Ethan Zhuang <zhuangwj@gmail.com>.
> + *   Copyright(c) 2016 Intel Corporation.
> + *   All rights reserved.
> + *
> + *   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 copyright
> + *       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 FOR
> + *   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 ANY
> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
> TORT
> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
> THE USE
> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
> DAMAGE.
> + */
> +
> +#ifndef __INCLUDE_RTE_PORT_KNI_H__
> +#define __INCLUDE_RTE_PORT_KNI_H__
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/**
> + * @file
> + * RTE Port KNI Interface
> + *
> + * kni_reader: input port built on top of pre-initialized KNI interface
> + * kni_writer: output port built on top of pre-initialized KNI interface
> + *
> + ***/
> +
> +#include <stdint.h>
> +
> +#include <rte_kni.h>
> +
> +#include "rte_port.h"
> +
> +/** kni_reader port parameters */
> +struct rte_port_kni_reader_params {
> +	/** KNI interface reference */
> +	struct rte_kni *kni;
> +};
> +
> +/** kni_reader port operations */
> +extern struct rte_port_in_ops rte_port_kni_reader_ops;
> +
> +
> +/** kni_writer port parameters */
> +struct rte_port_kni_writer_params {
> +	/** KNI interface reference */
> +	struct rte_kni *kni;
> +	/** Burst size to KNI interface. */
> +	uint32_t tx_burst_sz;
> +};
> +
> +/** kni_writer port operations */
> +extern struct rte_port_out_ops rte_port_kni_writer_ops;
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/lib/librte_port/rte_port_version.map
> b/lib/librte_port/rte_port_version.map
> index 7a0b34d..e61b3fa 100644
> --- a/lib/librte_port/rte_port_version.map
> +++ b/lib/librte_port/rte_port_version.map
> @@ -35,3 +35,11 @@ DPDK_2.2 {
>  	rte_port_ring_multi_writer_nodrop_ops;
> 
>  } DPDK_2.1;
> +
> +DPDK_16.07 {
> +	global:
> +
> +	rte_port_kni_reader_ops;
> +	rte_port_kni_writer_ops;
> +
> +} DPDK_2.2;
> --
> 2.7.4

Regards,
Cristian