[dpdk-dev] [PATCH] port: add KNI interface support 1. add KNI port type to the packet framework 2. add KNI support to the IP Pipeline sample Application

[WeiJie Zhuang <zhuangwj@gmail.com>]

Signed-off-by: WeiJie Zhuang <zhuangwj@gmail.com>
---
 doc/api/doxy-api-index.md           |   3 +-
 examples/ip_pipeline/Makefile       |   6 +-
 examples/ip_pipeline/app.h          |  74 ++++++++
 examples/ip_pipeline/config/kni.cfg |  12 ++
 examples/ip_pipeline/config_check.c |  30 ++++
 examples/ip_pipeline/config_parse.c | 129 ++++++++++++++
 examples/ip_pipeline/init.c         |  70 ++++++++
 examples/ip_pipeline/kni/kni.c      |  73 ++++++++
 examples/ip_pipeline/kni/kni.h      |  15 ++
 examples/ip_pipeline/pipeline_be.h  |  13 ++
 examples/ip_pipeline/thread.c       |   8 +
 lib/librte_port/Makefile            |   7 +
 lib/librte_port/rte_port_kni.c      | 325 ++++++++++++++++++++++++++++++++++++
 lib/librte_port/rte_port_kni.h      |  81 +++++++++
 14 files changed, 843 insertions(+), 3 deletions(-)
 create mode 100644 examples/ip_pipeline/config/kni.cfg
 create mode 100644 examples/ip_pipeline/kni/kni.c
 create mode 100644 examples/ip_pipeline/kni/kni.h
 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..06802c2 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -118,7 +118,8 @@ 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),
-    [src/sink]         (@ref rte_port_source_sink.h)
+    [src/sink]         (@ref rte_port_source_sink.h),
+    [kni]              (@ref rte_port_kni.h)
   * [table]            (@ref rte_table.h):
     [lpm IPv4]         (@ref rte_table_lpm.h),
     [lpm IPv6]         (@ref rte_table_lpm_ipv6.h),
diff --git a/examples/ip_pipeline/Makefile b/examples/ip_pipeline/Makefile
index 10fe1ba..848c2aa 100644
--- a/examples/ip_pipeline/Makefile
+++ b/examples/ip_pipeline/Makefile
@@ -43,9 +43,10 @@ include $(RTE_SDK)/mk/rte.vars.mk
 # binary name
 APP = ip_pipeline
 
+VPATH += $(SRCDIR)/kni
 VPATH += $(SRCDIR)/pipeline
 
-INC += $(wildcard *.h) $(wildcard pipeline/*.h)
+INC += $(wildcard *.h) $(wildcard pipeline/*.h) $(wildcard kni/*.h)
 
 # all source are stored in SRCS-y
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) := main.c
@@ -56,6 +57,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += init.c
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += thread.c
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += thread_fe.c
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += cpu_core_map.c
+SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += kni.c
 
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += pipeline_common_be.c
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += pipeline_common_fe.c
@@ -72,7 +74,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += pipeline_flow_actions.c
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += pipeline_routing_be.c
 SRCS-$(CONFIG_RTE_LIBRTE_PIPELINE) += pipeline_routing.c
 
-CFLAGS += -I$(SRCDIR) -I$(SRCDIR)/pipeline
+CFLAGS += -I$(SRCDIR) -I$(SRCDIR)/pipeline -I$(SRCDIR)/kni
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS) -Wno-error=unused-function -Wno-error=unused-variable
 
diff --git a/examples/ip_pipeline/app.h b/examples/ip_pipeline/app.h
index e775024..a45976c 100644
--- a/examples/ip_pipeline/app.h
+++ b/examples/ip_pipeline/app.h
@@ -44,7 +44,9 @@
 #include <cmdline_parse.h>
 
 #include <rte_ethdev.h>
+#include <rte_kni.h>
 
+#include "kni.h"
 #include "cpu_core_map.h"
 #include "pipeline.h"
 
@@ -99,6 +101,18 @@ struct app_pktq_hwq_out_params {
 	struct rte_eth_txconf conf;
 };
 
+struct app_kni_params {
+	char *name;
+	uint32_t parsed;
+
+	uint32_t socket_id;
+	uint32_t core_id;
+	uint32_t hyper_th_id;
+
+	uint32_t mempool_id;
+	uint32_t burst;
+};
+
 struct app_pktq_swq_params {
 	char *name;
 	uint32_t parsed;
@@ -172,6 +186,7 @@ enum app_pktq_in_type {
 	APP_PKTQ_IN_SWQ,
 	APP_PKTQ_IN_TM,
 	APP_PKTQ_IN_SOURCE,
+	APP_PKTQ_IN_KNI,
 };
 
 struct app_pktq_in_params {
@@ -184,6 +199,7 @@ enum app_pktq_out_type {
 	APP_PKTQ_OUT_SWQ,
 	APP_PKTQ_OUT_TM,
 	APP_PKTQ_OUT_SINK,
+	APP_PKTQ_OUT_KNI,
 };
 
 struct app_pktq_out_params {
@@ -434,6 +450,10 @@ struct app_eal_params {
 #define APP_THREAD_HEADROOM_STATS_COLLECT        1
 #endif
 
+#ifndef APP_MAX_KNI
+#define APP_MAX_KNI                              8
+#endif
+
 struct app_params {
 	/* Config */
 	char app_name[APP_APPNAME_SIZE];
@@ -457,6 +477,7 @@ struct app_params {
 	struct app_pktq_sink_params sink_params[APP_MAX_PKTQ_SINK];
 	struct app_msgq_params msgq_params[APP_MAX_MSGQ];
 	struct app_pipeline_params pipeline_params[APP_MAX_PIPELINES];
+	struct app_kni_params kni_params[APP_MAX_KNI];
 
 	uint32_t n_mempools;
 	uint32_t n_links;
@@ -468,6 +489,7 @@ struct app_params {
 	uint32_t n_pktq_sink;
 	uint32_t n_msgq;
 	uint32_t n_pipelines;
+	uint32_t n_kni;
 
 	/* Init */
 	char *eal_argv[1 + APP_EAL_ARGC];
@@ -480,6 +502,7 @@ struct app_params {
 	struct pipeline_type pipeline_type[APP_MAX_PIPELINE_TYPES];
 	struct app_pipeline_data pipeline_data[APP_MAX_PIPELINES];
 	struct app_thread_data thread_data[APP_MAX_THREADS];
+	struct rte_kni *kni[APP_MAX_KNI];
 	cmdline_parse_ctx_t cmds[APP_MAX_CMDS + 1];
 
 	int eal_argc;
@@ -738,6 +761,31 @@ app_msgq_get_readers(struct app_params *app, struct app_msgq_params *msgq)
 }
 
 static inline uint32_t
+app_kni_get_readers(struct app_params *app, struct app_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 uint32_t
 app_txq_get_writers(struct app_params *app, struct app_pktq_hwq_out_params *txq)
 {
 	uint32_t pos = txq - app->hwq_out_params;
@@ -863,6 +911,32 @@ app_msgq_get_writers(struct app_params *app, struct app_msgq_params *msgq)
 	return n_writers;
 }
 
+static inline uint32_t
+app_kni_get_writers(struct app_params *app, struct app_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_link_params *
 app_get_link_for_rxq(struct app_params *app, struct app_pktq_hwq_in_params *p)
 {
diff --git a/examples/ip_pipeline/config/kni.cfg b/examples/ip_pipeline/config/kni.cfg
new file mode 100644
index 0000000..30466b0
--- /dev/null
+++ b/examples/ip_pipeline/config/kni.cfg
@@ -0,0 +1,12 @@
+[KNI0]
+core = 2
+
+[PIPELINE0]
+type = MASTER
+core = 0
+
+[PIPELINE1]
+type = PASS-THROUGH
+core = 1
+pktq_in = RXQ0.0 KNI0
+pktq_out = KNI0 TXQ0.0
diff --git a/examples/ip_pipeline/config_check.c b/examples/ip_pipeline/config_check.c
index fd9ff49..2981e65 100644
--- a/examples/ip_pipeline/config_check.c
+++ b/examples/ip_pipeline/config_check.c
@@ -426,6 +426,35 @@ check_pipelines(struct app_params *app)
 	}
 }
 
+static void
+check_kni(struct app_params *app) {
+	uint32_t i;
+	uint32_t port_id;
+
+	for (i = 0; i < app->n_kni; i++) {
+		struct app_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);
+		sscanf(p->name, "KNI%" PRIu32, &port_id);
+
+		APP_CHECK((n_readers != 0),
+				  "%s has no reader\n", p->name);
+
+		if (n_readers > 1)
+			APP_LOG(app, LOW, "%s has more than one reader", p->name);
+
+		APP_CHECK((n_writers != 0),
+				  "%s has no writer\n", p->name);
+
+		if (n_writers > 1)
+			APP_LOG(app, LOW, "%s has more than one writer", p->name);
+
+		APP_CHECK(port_id < app->n_links,
+				  "kni %s is not associated with a valid link\n",
+				  p->name);
+	}
+}
+
 int
 app_config_check(struct app_params *app)
 {
@@ -439,6 +468,7 @@ app_config_check(struct app_params *app)
 	check_sinks(app);
 	check_msgqs(app);
 	check_pipelines(app);
+	check_kni(app);
 
 	return 0;
 }
diff --git a/examples/ip_pipeline/config_parse.c b/examples/ip_pipeline/config_parse.c
index e5efd03..7e706e4 100644
--- a/examples/ip_pipeline/config_parse.c
+++ b/examples/ip_pipeline/config_parse.c
@@ -209,6 +209,15 @@ struct app_pipeline_params default_pipeline_params = {
 	.n_args = 0,
 };
 
+struct app_kni_params default_kni_params = {
+	.parsed = 0,
+	.socket_id = 0,
+	.core_id = 0,
+	.hyper_th_id = 0,
+	.mempool_id = 0,
+	.burst = 32,
+};
+
 static const char app_usage[] =
 	"Usage: %s [-f CONFIG_FILE] [-s SCRIPT_FILE] [-p PORT_MASK] "
 	"[-l LOG_LEVEL] [--preproc PREPROCESSOR] [--preproc-args ARGS]\n"
@@ -1169,6 +1178,9 @@ parse_pipeline_pktq_in(struct app_params *app,
 		} else if (validate_name(name, "SOURCE", 1) == 0) {
 			type = APP_PKTQ_IN_SOURCE;
 			id = APP_PARAM_ADD(app->source_params, name);
+		} else if (validate_name(name, "KNI", 1) == 0) {
+			type = APP_PKTQ_IN_KNI;
+			id = APP_PARAM_ADD(app->kni_params, name);
 		} else
 			return -EINVAL;
 
@@ -1240,6 +1252,9 @@ parse_pipeline_pktq_out(struct app_params *app,
 		} else if (validate_name(name, "SINK", 1) == 0) {
 			type = APP_PKTQ_OUT_SINK;
 			id = APP_PARAM_ADD(app->sink_params, name);
+		} else if (validate_name(name, "KNI", 1) == 0) {
+			type = APP_PKTQ_OUT_KNI;
+			id = APP_PARAM_ADD(app->kni_params, name);
 		} else
 			return -EINVAL;
 
@@ -2459,6 +2474,75 @@ parse_msgq(struct app_params *app,
 	free(entries);
 }
 
+static void
+parse_kni(struct app_params *app,
+		   const char *section_name,
+		   struct rte_cfgfile *cfg)
+{
+	struct app_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);
+	PARSER_PARAM_ADD_CHECK(param_idx, app->kni_params, section_name);
+
+	param = &app->kni_params[param_idx];
+
+	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);
+			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);
+			PARSER_PARAM_ADD_CHECK(idx, app->mempool_params,
+								   section_name);
+			param->mempool_id = idx;
+			continue;
+		}
+
+		if (strcmp(ent->name, "burst") == 0) {
+			int status = parser_read_uint32(&param->burst,
+											ent->value);
+
+			PARSE_ERROR((status == 0), section_name,
+						ent->name);
+			continue;
+		}
+
+		/* unrecognized */
+		PARSE_ERROR_INVALID(0, section_name, ent->name);
+	}
+
+	param->parsed = 1;
+
+	free(entries);
+}
+
 typedef void (*config_section_load)(struct app_params *p,
 	const char *section_name,
 	struct rte_cfgfile *cfg);
@@ -2483,6 +2567,7 @@ static const struct config_section cfg_file_scheme[] = {
 	{"MSGQ-REQ-PIPELINE", 1, parse_msgq_req_pipeline},
 	{"MSGQ-RSP-PIPELINE", 1, parse_msgq_rsp_pipeline},
 	{"MSGQ", 1, parse_msgq},
+	{"KNI", 1, parse_kni},
 };
 
 static void
@@ -2619,6 +2704,7 @@ app_config_parse(struct app_params *app, const char *file_name)
 	APP_PARAM_COUNT(app->sink_params, app->n_pktq_sink);
 	APP_PARAM_COUNT(app->msgq_params, app->n_msgq);
 	APP_PARAM_COUNT(app->pipeline_params, app->n_pipelines);
+	APP_PARAM_COUNT(app->kni_params, app->n_kni);
 
 #ifdef RTE_PORT_PCAP
 	for (i = 0; i < (int)app->n_pktq_source; i++) {
@@ -3025,6 +3111,9 @@ save_pipeline_params(struct app_params *app, FILE *f)
 				case APP_PKTQ_IN_SOURCE:
 					name = app->source_params[pp->id].name;
 					break;
+				case APP_PKTQ_IN_KNI:
+					name = app->kni_params[pp->id].name;
+					break;
 				default:
 					APP_CHECK(0, "System error "
 						"occurred while saving "
@@ -3059,6 +3148,9 @@ save_pipeline_params(struct app_params *app, FILE *f)
 				case APP_PKTQ_OUT_SINK:
 					name = app->sink_params[pp->id].name;
 					break;
+				case APP_PKTQ_OUT_KNI:
+					name = app->kni_params[pp->id].name;
+					break;
 				default:
 					APP_CHECK(0, "System error "
 						"occurred while saving "
@@ -3114,6 +3206,37 @@ save_pipeline_params(struct app_params *app, FILE *f)
 	}
 }
 
+static void
+save_kni_params(struct app_params *app, FILE *f)
+{
+	struct app_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 */
+		fprintf(f, "core = s%" PRIu32 "c%" PRIu32 "%s\n",
+				p->socket_id,
+				p->core_id,
+				(p->hyper_th_id) ? "h" : "");
+
+		/* mempool */
+		fprintf(f, "%s = %" PRIu32 "\n", "mempool_id", p->mempool_id);
+
+		/* burst */
+		fprintf(f, "%s = %" PRIu32 "\n", "burst", p->burst);
+
+		fputc('\n', f);
+	}
+}
+
 void
 app_config_save(struct app_params *app, const char *file_name)
 {
@@ -3144,6 +3267,7 @@ app_config_save(struct app_params *app, const char *file_name)
 	save_source_params(app, file);
 	save_sink_params(app, file);
 	save_msgq_params(app, file);
+	save_kni_params(app, file);
 
 	fclose(file);
 	free(name);
@@ -3206,6 +3330,11 @@ app_config_init(struct app_params *app)
 			&default_pipeline_params,
 			sizeof(default_pipeline_params));
 
+	for (i = 0; i < RTE_DIM(app->kni_params); i++)
+		memcpy(&app->kni_params[i],
+			&default_kni_params,
+			sizeof(default_kni_params));
+
 	return 0;
 }
 
diff --git a/examples/ip_pipeline/init.c b/examples/ip_pipeline/init.c
index 02351f6..d866464 100644
--- a/examples/ip_pipeline/init.c
+++ b/examples/ip_pipeline/init.c
@@ -89,6 +89,24 @@ app_init_core_mask(struct app_params *app)
 		mask |= 1LLU << lcore_id;
 	}
 
+	for (i = 0; i < app->n_kni; i++) {
+		struct app_kni_params *p = &app->kni_params[i];
+		int lcore_id;
+
+		lcore_id = cpu_core_map_get_lcore_id(app->core_map,
+			p->socket_id,
+			p->core_id,
+			p->hyper_th_id);
+
+		if (lcore_id < 0)
+			rte_panic("Cannot create CPU core mask\n");
+
+		if (mask & 1LLU << lcore_id)
+			rte_panic("KNI interface must use a dedicated lcore\n");
+
+		mask |= 1LLU << lcore_id;
+	}
+
 	app->core_mask = mask;
 	APP_LOG(app, HIGH, "CPU core mask = 0x%016" PRIx64, app->core_mask);
 }
@@ -1236,6 +1254,11 @@ static void app_pipeline_params_get(struct app_params *app,
 					n_bytes_per_pkt;
 			}
 			break;
+		case APP_PKTQ_IN_KNI:
+			out->type = PIPELINE_PORT_IN_KNI;
+			out->params.kni.kni = app->kni[in->id];
+			out->burst_size = app->kni_params[in->id].burst;
+			break;
 		default:
 			break;
 		}
@@ -1374,6 +1397,11 @@ static void app_pipeline_params_get(struct app_params *app,
 				out->params.sink.max_n_pkts = 0;
 			}
 			break;
+		case APP_PKTQ_OUT_KNI:
+			out->type = PIPELINE_PORT_OUT_KNI;
+			out->params.kni.kni = app->kni[in->id];
+			out->params.kni.tx_burst_sz = app->kni_params[in->id].burst;
+			break;
 		default:
 			break;
 		}
@@ -1397,6 +1425,47 @@ static void app_pipeline_params_get(struct app_params *app,
 }
 
 static void
+app_init_kni(struct app_params *app) {
+	uint32_t i;
+	struct rte_kni_conf conf;
+
+	rte_kni_init((unsigned int)app->n_kni);
+
+	for (i = 0; i < app->n_kni; i++) {
+		struct app_kni_params *p_kni = &app->kni_params[i];
+		uint32_t port_id;
+
+		sscanf(p_kni->name, "KNI%" PRIu32, &port_id);
+
+		memset(&conf, 0, sizeof(conf));
+		snprintf(conf.name, RTE_KNI_NAMESIZE,
+				 "vEth%u", port_id);
+		conf.core_id = p_kni->core_id;
+		conf.force_bind = 1;
+
+		conf.group_id = (uint16_t) port_id;
+		conf.mbuf_size = app->mempool_params[p_kni->mempool_id].buffer_size;
+
+		struct rte_kni_ops ops;
+		struct rte_eth_dev_info dev_info;
+
+		memset(&dev_info, 0, sizeof(dev_info));
+		rte_eth_dev_info_get(app->link_params[port_id].pmd_id, &dev_info);
+		conf.addr = dev_info.pci_dev->addr;
+		conf.id = dev_info.pci_dev->id;
+
+		memset(&ops, 0, sizeof(ops));
+		ops.port_id = app->link_params[port_id].pmd_id;
+		ops.change_mtu = kni_change_mtu;
+		ops.config_network_if = kni_config_network_interface;
+
+		app->kni[i] = rte_kni_alloc(app->mempool[p_kni->mempool_id], &conf, &ops);
+		if (!app->kni[i])
+			rte_panic("Fail to create kni for port: %d\n", port_id);
+	}
+}
+
+static void
 app_init_pipelines(struct app_params *app)
 {
 	uint32_t p_id;
@@ -1531,6 +1600,7 @@ int app_init(struct app_params *app)
 	app_init_swq(app);
 	app_init_tm(app);
 	app_init_msgq(app);
+	app_init_kni(app);
 
 	app_pipeline_common_cmd_push(app);
 	app_pipeline_thread_cmd_push(app);
diff --git a/examples/ip_pipeline/kni/kni.c b/examples/ip_pipeline/kni/kni.c
new file mode 100644
index 0000000..bfa596e
--- /dev/null
+++ b/examples/ip_pipeline/kni/kni.c
@@ -0,0 +1,73 @@
+#include <string.h>
+
+#include <rte_common.h>
+#include <rte_malloc.h>
+#include <rte_table_array.h>
+#include <rte_kni.h>
+#include <rte_ethdev.h>
+
+#include "rte_port_kni.h"
+#include "kni.h"
+
+int
+kni_config_network_interface(uint8_t port_id, uint8_t if_up)
+{
+    int ret = 0;
+
+    if (port_id >= rte_eth_dev_count() || port_id >= RTE_MAX_ETHPORTS) {
+        RTE_LOG(ERR, PORT, "%s: Invalid port id %d\n", __func__, port_id);
+        return -EINVAL;
+    }
+
+    RTE_LOG(INFO, PORT, "%s: Configure network interface of %d %s\n",
+            __func__, port_id, if_up ? "up" : "down");
+
+    if (if_up != 0) { /* Configure network interface up */
+        rte_eth_dev_stop(port_id);
+        ret = rte_eth_dev_start(port_id);
+    } else /* Configure network interface down */
+        rte_eth_dev_stop(port_id);
+
+    if (ret < 0)
+        RTE_LOG(ERR, PORT, "%s: Failed to start port %d\n", __func__, port_id);
+
+    return ret;
+}
+
+int
+kni_change_mtu(uint8_t port_id, unsigned new_mtu)
+{
+    int ret;
+
+    if (port_id >= rte_eth_dev_count()) {
+        RTE_LOG(ERR, PORT, "%s: Invalid port id %d\n", __func__, port_id);
+        return -EINVAL;
+    }
+
+    if (new_mtu > ETHER_MAX_LEN) {
+        RTE_LOG(ERR, PORT, "%s: Fail to reconfigure port %d, the new MTU is too big\n", __func__, port_id);
+        return -EINVAL;
+    }
+
+    RTE_LOG(INFO, PORT, "%s: Change MTU of port %d to %u\n", __func__, port_id, new_mtu);
+
+    /* 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) {
+        RTE_LOG(ERR, PORT, "%s: Fail to reconfigure port %d\n", __func__, port_id);
+        return ret;
+    }
+
+    /* Restart specific port */
+    ret = rte_eth_dev_start(port_id);
+    if (ret < 0) {
+        RTE_LOG(ERR, PORT, "%s: Fail to restart port %d\n", __func__, port_id);
+        return ret;
+    }
+
+    return 0;
+}
+
diff --git a/examples/ip_pipeline/kni/kni.h b/examples/ip_pipeline/kni/kni.h
new file mode 100644
index 0000000..932cccf
--- /dev/null
+++ b/examples/ip_pipeline/kni/kni.h
@@ -0,0 +1,15 @@
+#ifndef __INCLUDE_KNI_H__
+#define __INCLUDE_KNI_H__
+
+#include <rte_common.h>
+
+/* Total octets in ethernet header */
+#define KNI_ENET_HEADER_SIZE    14
+
+/* Total octets in the FCS */
+#define KNI_ENET_FCS_SIZE       4
+
+int kni_config_network_interface(uint8_t port_id, uint8_t if_up);
+int kni_change_mtu(uint8_t port_id, unsigned new_mtu);
+
+#endif
\ No newline at end of file
diff --git a/examples/ip_pipeline/pipeline_be.h b/examples/ip_pipeline/pipeline_be.h
index f4ff262..23f0438 100644
--- a/examples/ip_pipeline/pipeline_be.h
+++ b/examples/ip_pipeline/pipeline_be.h
@@ -40,6 +40,7 @@
 #include <rte_port_ras.h>
 #include <rte_port_sched.h>
 #include <rte_port_source_sink.h>
+#include <rte_port_kni.h>
 #include <rte_pipeline.h>
 
 enum pipeline_port_in_type {
@@ -50,6 +51,7 @@ enum pipeline_port_in_type {
 	PIPELINE_PORT_IN_RING_READER_IPV6_FRAG,
 	PIPELINE_PORT_IN_SCHED_READER,
 	PIPELINE_PORT_IN_SOURCE,
+	PIPELINE_PORT_IN_KNI,
 };
 
 struct pipeline_port_in_params {
@@ -62,6 +64,7 @@ struct pipeline_port_in_params {
 		struct rte_port_ring_reader_ipv6_frag_params ring_ipv6_frag;
 		struct rte_port_sched_reader_params sched;
 		struct rte_port_source_params source;
+		struct rte_port_kni_reader_params kni;
 	} params;
 	uint32_t burst_size;
 };
@@ -84,6 +87,8 @@ pipeline_port_in_params_convert(struct pipeline_port_in_params  *p)
 		return (void *) &p->params.sched;
 	case PIPELINE_PORT_IN_SOURCE:
 		return (void *) &p->params.source;
+	case PIPELINE_PORT_IN_KNI:
+		return (void *) &p->params.kni;
 	default:
 		return NULL;
 	}
@@ -107,6 +112,8 @@ pipeline_port_in_params_get_ops(struct pipeline_port_in_params  *p)
 		return &rte_port_sched_reader_ops;
 	case PIPELINE_PORT_IN_SOURCE:
 		return &rte_port_source_ops;
+	case PIPELINE_PORT_IN_KNI:
+		return &rte_port_kni_reader_ops;
 	default:
 		return NULL;
 	}
@@ -123,6 +130,7 @@ enum pipeline_port_out_type {
 	PIPELINE_PORT_OUT_RING_WRITER_IPV6_RAS,
 	PIPELINE_PORT_OUT_SCHED_WRITER,
 	PIPELINE_PORT_OUT_SINK,
+	PIPELINE_PORT_OUT_KNI,
 };
 
 struct pipeline_port_out_params {
@@ -138,6 +146,7 @@ struct pipeline_port_out_params {
 		struct rte_port_ring_writer_ipv6_ras_params ring_ipv6_ras;
 		struct rte_port_sched_writer_params sched;
 		struct rte_port_sink_params sink;
+		struct rte_port_kni_writer_params kni;
 	} params;
 };
 
@@ -165,6 +174,8 @@ pipeline_port_out_params_convert(struct pipeline_port_out_params  *p)
 		return (void *) &p->params.sched;
 	case PIPELINE_PORT_OUT_SINK:
 		return (void *) &p->params.sink;
+	case PIPELINE_PORT_OUT_KNI:
+		return (void *) &p->params.kni;
 	default:
 		return NULL;
 	}
@@ -194,6 +205,8 @@ pipeline_port_out_params_get_ops(struct pipeline_port_out_params  *p)
 		return &rte_port_sched_writer_ops;
 	case PIPELINE_PORT_OUT_SINK:
 		return &rte_port_sink_ops;
+	case PIPELINE_PORT_OUT_KNI:
+		return &rte_port_kni_writer_ops;
 	default:
 		return NULL;
 	}
diff --git a/examples/ip_pipeline/thread.c b/examples/ip_pipeline/thread.c
index a0f1f12..f16f642 100644
--- a/examples/ip_pipeline/thread.c
+++ b/examples/ip_pipeline/thread.c
@@ -239,6 +239,14 @@ app_thread(void *arg)
 	uint32_t core_id = rte_lcore_id(), i, j;
 	struct app_thread_data *t = &app->thread_data[core_id];
 
+	for (i = 0; i < app->n_kni; i++) {
+		if (core_id == (uint32_t)cpu_core_map_get_lcore_id(app->core_map,
+			app->kni_params[i].socket_id,
+			app->kni_params[i].core_id,
+			app->kni_params[i].hyper_th_id))
+			return 0;
+	}
+
 	for (i = 0; ; i++) {
 		uint32_t n_regular = RTE_MIN(t->n_regular, RTE_DIM(t->regular));
 		uint32_t n_custom = RTE_MIN(t->n_custom, RTE_DIM(t->custom));
diff --git a/lib/librte_port/Makefile b/lib/librte_port/Makefile
index d4de5af..f18253d 100644
--- a/lib/librte_port/Makefile
+++ b/lib/librte_port/Makefile
@@ -57,6 +57,9 @@ SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_ras.c
 endif
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_sched.c
 SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_source_sink.c
+ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
+SRCS-$(CONFIG_RTE_LIBRTE_PORT) += rte_port_kni.c
+endif
 
 # install includes
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port.h
@@ -68,6 +71,9 @@ SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_ras.h
 endif
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_sched.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_source_sink.h
+ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
+SYMLINK-$(CONFIG_RTE_LIBRTE_PORT)-include += rte_port_kni.h
+endif
 
 # this lib depends upon:
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) := lib/librte_eal
@@ -75,5 +81,6 @@ DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_mbuf
 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_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..0771ed2
--- /dev/null
+++ b/lib/librte_port/rte_port_kni.c
@@ -0,0 +1,325 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   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;
+	uint16_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_kni_handle_request(p->kni);
+
+	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..5cb1134
--- /dev/null
+++ b/lib/librte_port/rte_port_kni.h
@@ -0,0 +1,81 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   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
-- 
2.6.4.windows.1