[dpdk-dev] [PATCH v10 1/3] lib: add Generic Receive Offload API framework
Tan, Jianfeng
jianfeng.tan at intel.com
Sun Jul 2 12:19:50 CEST 2017
On 7/1/2017 7:08 PM, Jiayu Hu wrote:
> Generic Receive Offload (GRO) is a widely used SW-based offloading
> technique to reduce per-packet processing overhead. It gains
> performance by reassembling small packets into large ones. This
> patchset is to support GRO in DPDK. To support GRO, this patch
> implements a GRO API framework.
>
> To enable more flexibility to applications, DPDK GRO is implemented as
> a user library. Applications explicitly use the GRO library to merge
> small packets into large ones. DPDK GRO provides two reassembly modes.
> One is called lightweight mode, the other is called heavyweight mode.
> If applications want to merge packets in a simple way and the number
> of packets is relatively small, they can use the lightweight mode.
> If applications need more fine-grained controls, they can choose the
> heavyweight mode.
>
> rte_gro_reassemble_burst is the main reassembly API which is used in
> lightweight mode and processes N packets at a time. For applications,
> performing GRO in lightweight mode is simple. They just need to invoke
> rte_gro_reassemble_burst. Applications can get GROed packets as soon as
> rte_gro_reassemble_burst returns.
>
> rte_gro_reassemble is the main reassembly API which is used in
> heavyweight mode and tries to merge N inputted packets with the packets
> in a givn GRO table. For applications, performing GRO in heavyweight
> mode is relatively complicated. Before performing GRO, applications need
> to create a GRO table by rte_gro_tbl_create. Then they can use
> rte_gro_reassemble to merge packets. The GROed packets are in the GRO
> table. If applications want to get them, applications need to manually
> flush them by flush API.
> Signed-off-by: Jiayu Hu <jiayu.hu at intel.com>
> ---
> config/common_base | 5 ++
> lib/Makefile | 2 +
> lib/librte_gro/Makefile | 50 +++++++++++
> lib/librte_gro/rte_gro.c | 176 +++++++++++++++++++++++++++++++++++++
> lib/librte_gro/rte_gro.h | 176 +++++++++++++++++++++++++++++++++++++
> lib/librte_gro/rte_gro_version.map | 12 +++
> mk/rte.app.mk | 1 +
> 7 files changed, 422 insertions(+)
> create mode 100644 lib/librte_gro/Makefile
> create mode 100644 lib/librte_gro/rte_gro.c
> create mode 100644 lib/librte_gro/rte_gro.h
> create mode 100644 lib/librte_gro/rte_gro_version.map
>
> diff --git a/config/common_base b/config/common_base
> index f6aafd1..167f5ef 100644
> --- a/config/common_base
> +++ b/config/common_base
> @@ -712,6 +712,11 @@ CONFIG_RTE_LIBRTE_VHOST_DEBUG=n
> CONFIG_RTE_LIBRTE_PMD_VHOST=n
>
> #
> +# Compile GRO library
> +#
> +CONFIG_RTE_LIBRTE_GRO=y
> +
> +#
> #Compile Xen domain0 support
> #
> CONFIG_RTE_LIBRTE_XEN_DOM0=n
> diff --git a/lib/Makefile b/lib/Makefile
> index 07e1fd0..ac1c2f6 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -106,6 +106,8 @@ DIRS-$(CONFIG_RTE_LIBRTE_REORDER) += librte_reorder
> DEPDIRS-librte_reorder := librte_eal librte_mempool librte_mbuf
> DIRS-$(CONFIG_RTE_LIBRTE_PDUMP) += librte_pdump
> DEPDIRS-librte_pdump := librte_eal librte_mempool librte_mbuf librte_ether
> +DIRS-$(CONFIG_RTE_LIBRTE_GRO) += librte_gro
> +DEPDIRS-librte_gro := librte_eal librte_mbuf librte_ether librte_net
>
> ifeq ($(CONFIG_RTE_EXEC_ENV_LINUXAPP),y)
> DIRS-$(CONFIG_RTE_LIBRTE_KNI) += librte_kni
> diff --git a/lib/librte_gro/Makefile b/lib/librte_gro/Makefile
> new file mode 100644
> index 0000000..7e0f128
> --- /dev/null
> +++ b/lib/librte_gro/Makefile
> @@ -0,0 +1,50 @@
> +# BSD LICENSE
> +#
> +# Copyright(c) 2017 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 $(RTE_SDK)/mk/rte.vars.mk
> +
> +# library name
> +LIB = librte_gro.a
> +
> +CFLAGS += -O3
> +CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR)
> +
> +EXPORT_MAP := rte_gro_version.map
> +
> +LIBABIVER := 1
> +
> +# source files
> +SRCS-$(CONFIG_RTE_LIBRTE_GRO) += rte_gro.c
> +
> +# install this header file
> +SYMLINK-$(CONFIG_RTE_LIBRTE_GRO)-include += rte_gro.h
> +
> +include $(RTE_SDK)/mk/rte.lib.mk
> diff --git a/lib/librte_gro/rte_gro.c b/lib/librte_gro/rte_gro.c
> new file mode 100644
> index 0000000..648835b
> --- /dev/null
> +++ b/lib/librte_gro/rte_gro.c
> @@ -0,0 +1,176 @@
> +/*-
> + * BSD LICENSE
> + *
> + * Copyright(c) 2017 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 <rte_malloc.h>
> +#include <rte_mbuf.h>
> +
> +#include "rte_gro.h"
> +
> +typedef void *(*gro_tbl_create_fn)(uint16_t socket_id,
> + uint16_t max_flow_num,
> + uint16_t max_item_per_flow);
> +typedef void (*gro_tbl_destroy_fn)(void *tbl);
> +typedef uint32_t (*gro_tbl_item_num_fn)(void *tbl);
> +
> +static gro_tbl_create_fn tbl_create_functions[RTE_GRO_TYPE_MAX_NUM];
> +static gro_tbl_destroy_fn tbl_destroy_functions[RTE_GRO_TYPE_MAX_NUM];
> +static gro_tbl_item_num_fn tbl_item_num_functions[RTE_GRO_TYPE_MAX_NUM];
> +
> +/**
> + * GRO table, which is used to merge packets. It keeps many reassembly
> + * tables of desired GRO types. Applications need to create GRO tables
> + * before using rte_gro_reassemble to perform GRO.
> + */
> +struct gro_tbl {
> + uint64_t desired_gro_types; /**< GRO types to perform */
> + /* max TTL measured in nanosecond */
> + uint64_t max_timeout_cycles;
> + /* max length of merged packet measured in byte */
> + uint32_t max_packet_size;
> + /* reassebly tables of desired GRO types */
> + void *tbls[RTE_GRO_TYPE_MAX_NUM];
> +};
> +
> +void *rte_gro_tbl_create(const
> + const struct rte_gro_param *param)
The name of this API and the definition of struct gro_tbl involve some
confusion. A gro table contains gro tables? I suppose a better name is
needed, for example, struct gro_ctl.
> +{
> + gro_tbl_create_fn create_tbl_fn;
> + gro_tbl_destroy_fn destroy_tbl_fn;
> + struct gro_tbl *gro_tbl;
> + uint64_t gro_type_flag = 0;
> + uint8_t i, j;
> +
> + gro_tbl = rte_zmalloc_socket(__func__,
> + sizeof(struct gro_tbl),
> + RTE_CACHE_LINE_SIZE,
> + param->socket_id);
> + if (gro_tbl == NULL)
> + return NULL;
> + gro_tbl->max_packet_size = param->max_packet_size;
> + gro_tbl->max_timeout_cycles = param->max_timeout_cycles;
> + gro_tbl->desired_gro_types = param->desired_gro_types;
> +
> + for (i = 0; i < RTE_GRO_TYPE_MAX_NUM; i++) {
> + gro_type_flag = 1 << i;
> +
> + if ((param->desired_gro_types & gro_type_flag) == 0)
> + continue;
> + create_tbl_fn = tbl_create_functions[i];
> + if (create_tbl_fn == NULL)
> + continue;
> +
> + gro_tbl->tbls[i] = create_tbl_fn(
> + param->socket_id,
> + param->max_flow_num,
> + param->max_item_per_flow);
Here and somewhere else: the alignment seems not correct.
gro_tbl->tbls[i] = create_tbl_fn(param->socket_id,
/* keep
all parameters aligned like this */
param->max_flow_num,
param->max_item_per_flow);
> + if (gro_tbl->tbls[i] == NULL) {
> + /* destroy all allocated tables */
> + for (j = 0; j < i; j++) {
> + gro_type_flag = 1 << j;
> + if ((param->desired_gro_types & gro_type_flag) == 0)
> + continue;
> + destroy_tbl_fn = tbl_destroy_functions[j];
> + if (destroy_tbl_fn)
> + destroy_tbl_fn(gro_tbl->tbls[j]);
> + }
> + rte_free(gro_tbl);
> + return NULL;
> + }
> + }
> + return gro_tbl;
> +}
> +
> +void rte_gro_tbl_destroy(void *tbl)
> +{
> + gro_tbl_destroy_fn destroy_tbl_fn;
> + struct gro_tbl *gro_tbl = (struct gro_tbl *)tbl;
> + uint64_t gro_type_flag;
> + uint8_t i;
> +
> + if (gro_tbl == NULL)
> + return;
> + for (i = 0; i < RTE_GRO_TYPE_MAX_NUM; i++) {
> + gro_type_flag = 1 << i;
> + if ((gro_tbl->desired_gro_types & gro_type_flag) == 0)
> + continue;
> + destroy_tbl_fn = tbl_destroy_functions[i];
> + if (destroy_tbl_fn)
> + destroy_tbl_fn(gro_tbl->tbls[i]);
> + }
> + rte_free(gro_tbl);
> +}
> +
> +uint16_t
> +rte_gro_reassemble_burst(struct rte_mbuf **pkts __rte_unused,
> + uint16_t nb_pkts,
> + const struct rte_gro_param *param __rte_unused)
> +{
> + return nb_pkts;
> +}
> +
> +uint16_t
> +rte_gro_reassemble(struct rte_mbuf **pkts __rte_unused,
> + uint16_t nb_pkts,
> + void *tbl __rte_unused)
> +{
> + return nb_pkts;
> +}
> +
> +uint16_t
> +rte_gro_timeout_flush(void *tbl __rte_unused,
> + uint64_t desired_gro_types __rte_unused,
> + struct rte_mbuf **out __rte_unused,
> + uint16_t max_nb_out __rte_unused)
> +{
> + return 0;
> +}
> +
> +uint64_t rte_gro_tbl_item_num(void *tbl)
Does rte_gro_get_count() sound better?
> +{
> + struct gro_tbl *gro_tbl = (struct gro_tbl *)tbl;
> + gro_tbl_item_num_fn item_num_fn;
> + uint64_t item_num = 0;
> + uint64_t gro_type_flag;
> + uint8_t i;
> +
> + for (i = 0; i < RTE_GRO_TYPE_MAX_NUM; i++) {
> + gro_type_flag = 1 << i;
> + if ((gro_tbl->desired_gro_types & gro_type_flag) == 0)
> + continue;
> +
> + item_num_fn = tbl_item_num_functions[i];
> + if (item_num_fn == NULL)
> + continue;
> + item_num += item_num_fn(gro_tbl->tbls[i]);
> + }
> + return item_num;
> +}
> diff --git a/lib/librte_gro/rte_gro.h b/lib/librte_gro/rte_gro.h
> new file mode 100644
> index 0000000..02c9113
> --- /dev/null
> +++ b/lib/librte_gro/rte_gro.h
> @@ -0,0 +1,176 @@
> +/*-
> + * BSD LICENSE
> + *
> + * Copyright(c) 2017 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 _RTE_GRO_H_
> +#define _RTE_GRO_H_
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/**
> + * the max packets number that rte_gro_reassemble_burst can
> + * process in each invocation.
> + */
> +#define RTE_GRO_MAX_BURST_ITEM_NUM 128UL
> +
> +/* max number of supported GRO types */
> +#define RTE_GRO_TYPE_MAX_NUM 64
> +#define RTE_GRO_TYPE_SUPPORT_NUM 0 /**< current supported GRO num */
> +
> +
> +struct rte_gro_param {
> + uint64_t desired_gro_types; /**< desired GRO types */
Make it gro_types for simplicity.
> + uint32_t max_packet_size; /**< max length of merged packets */
Refer to the tcp4 gro implementation, this is the max size for tcp
payload. But in principle, the 65535-byte limitation (including TCP
header) is because IP header lenght is 2-byte long.
What does it means for other GRO engines then? I think these should be
decided by each gro engine. And applications don't have to change them.
> + uint16_t max_flow_num; /**< max flow number */
> + uint16_t max_item_per_flow; /**< max packet number per flow */
> +
> + /* socket index where the Ethernet port connects to */
The comment needs to be refined. We have different socket idx for port,
for pmd thread. We just explain how this will be used: "socket index for
allocating gro related data structure".
> + uint16_t socket_id;
> + /* max TTL for a packet in the GRO table, measured in nanosecond */
> + uint64_t max_timeout_cycles;
We don't need to set it in lightweight mode. Please add this into the
comment.
> +};
> +
> +/**
> + * This function create a GRO table, which is used to merge packets in
> + * rte_gro_reassemble.
> + *
> + * @param param
> + * applications use it to pass needed parameters to create a GRO table.
> + * @return
> + * if create successfully, return a pointer which points to the GRO
> + * table. Otherwise, return NULL.
> + */
> +void *rte_gro_tbl_create(
> + const struct rte_gro_param *param);
Merge above two lines into one.
> +/**
> + * This function destroys a GRO table.
> + */
> +void rte_gro_tbl_destroy(void *tbl);
> +
> +/**
> + * This is one of the main reassembly APIs, which merges numbers of
> + * packets at a time. It assumes that all inputted packets are with
> + * correct checksums. That is, applications should guarantee all
> + * inputted packets are correct. Besides, it doesn't re-calculate
> + * checksums for merged packets. If inputted packets are IP fragmented,
> + * this function assumes them are complete (i.e. with L4 header). After
> + * finishing processing, it returns all GROed packets to applications
> + * immediately.
> + *
> + * @param pkts
> + * a pointer array which points to the packets to reassemble. Besides,
> + * it keeps packet addresses for GROed packets.
> + * @param nb_pkts
> + * the number of packets to reassemble.
> + * @param param
> + * applications use it to tell rte_gro_reassemble_burst what rules
> + * are demanded.
> + * @return
> + * the number of packets after been GROed.
> + */
> +uint16_t rte_gro_reassemble_burst(struct rte_mbuf **pkts,
> + uint16_t nb_pkts,
> + const struct rte_gro_param *param);
Fix the alignment.
> +
> +/**
> + * Reassembly function, which tries to merge inputted packets with
> + * the packets in a given GRO table. This function assumes all inputted
> + * packet is with correct checksums. And it won't update checksums if
> + * two packets are merged. Besides, if inputted packets are IP
> + * fragmented, this function assumes they are complete packets (i.e.
> + * with L4 header).
> + *
> + * If the inputted packets don't have data or are with unsupported GRO
> + * types, they won't be processed and are returned to applications.
> + * Otherwise, the inputted packets are either merged or inserted into
> + * the table. If applications want get packets in the table, they need
> + * to call flush API.
> + *
> + * @param pkts
> + * packet to reassemble. Besides, after this function finishes, it
> + * keeps the unprocessed packets (i.e. without data or unsupported
> + * GRO types).
> + * @param nb_pkts
> + * the number of packets to reassemble.
> + * @param tbl
> + * a pointer points to a GRO table.
> + * @return
> + * return the number of unprocessed packets (i.e. without data or
> + * unsupported GRO types). If all packets are processed (merged or
> + * inserted into the table), return 0.
> + */
> +uint16_t rte_gro_reassemble(struct rte_mbuf **pkts,
> + uint16_t nb_pkts,
> + void *tbl);
> +
> +/**
> + * This function flushes the timeout packets from reassembly tables of
> + * desired GRO types. The max number of flushed timeout packets is the
> + * element number of the array which is used to keep the flushed packets.
> + *
> + * Besides, this function won't re-calculate checksums for merged
> + * packets in the tables. That is, the returned packets may be with
> + * wrong checksums.
> + *
> + * @param tbl
> + * a pointer points to a GRO table object.
> + * @param desired_gro_types
> + * rte_gro_timeout_flush only processes packets which belong to the
> + * GRO types specified by desired_gro_types.
> + * @param out
> + * a pointer array that is used to keep flushed timeout packets.
> + * @param nb_out
> + * the element number of out. It's also the max number of timeout
> + * packets that can be flushed finally.
> + * @return
> + * the number of flushed packets. If no packets are flushed, return 0.
> + */
> +uint16_t rte_gro_timeout_flush(void *tbl,
> + uint64_t desired_gro_types,
> + struct rte_mbuf **out,
> + uint16_t max_nb_out);
> +
> +/**
> + * This function returns the number of packets in a given GRO table.
> + * @param tbl
> + * pointer points to a GRO table.
> + * @return
> + * the number of packets in the table.
> + */
> +uint64_t rte_gro_tbl_item_num(void *tbl);
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> diff --git a/lib/librte_gro/rte_gro_version.map b/lib/librte_gro/rte_gro_version.map
> new file mode 100644
> index 0000000..358fb9d
> --- /dev/null
> +++ b/lib/librte_gro/rte_gro_version.map
> @@ -0,0 +1,12 @@
> +DPDK_17.08 {
> + global:
> +
> + rte_gro_tbl_create;
> + rte_gro_tbl_destroy;
As stated earlier, here are the API names I suggested:
rte_gro_ctl_create()/rte_gro_ctl_destroy()/rte_gro_get_count().
> + rte_gro_reassemble_burst;
> + rte_gro_reassemble;
> + rte_gro_timeout_flush;
> + rte_gro_tbl_item_num;
> +
> + local: *;
> +};
> diff --git a/mk/rte.app.mk b/mk/rte.app.mk
> index bcaf1b3..fc3776d 100644
> --- a/mk/rte.app.mk
> +++ b/mk/rte.app.mk
> @@ -98,6 +98,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_RING) += -lrte_ring
> _LDLIBS-$(CONFIG_RTE_LIBRTE_EAL) += -lrte_eal
> _LDLIBS-$(CONFIG_RTE_LIBRTE_CMDLINE) += -lrte_cmdline
> _LDLIBS-$(CONFIG_RTE_LIBRTE_REORDER) += -lrte_reorder
> +_LDLIBS-$(CONFIG_RTE_LIBRTE_GRO) += -lrte_gro
>
> ifeq ($(CONFIG_RTE_EXEC_ENV_LINUXAPP),y)
> _LDLIBS-$(CONFIG_RTE_LIBRTE_KNI) += -lrte_kni
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