飞凌嵌入式iMX8MP 开发板试用体验--编译内核源码&编译DPDK源码实现rte_ring无锁环队列进程间通信

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飞凌嵌入式iMX8MP 开发板试用体验--编译内核源码&编译DPDK源码实现rte_ring无锁环队列进程间通信来源：电子发烧友作者：donatello1996

FETMX8MP-C核心板基于NXP i.MX 8M Plus处理器开发设计，该系列处理器专注于机器学习与视觉、高级多媒体以及具有高可靠性的工业自动化。旨在满足智慧城市、工业互联网、智能医疗、智慧交通等应用的需求。 ·强大的四核或双核Arm® Cortex®-A53处理器，主频高达1.6GHz，带有神经处理单元(NPU)，最高运行速率可达2.3 TOPS。

本文主要介绍编译内核源码&编译DPDK源码实现rte_ring无锁环队列进程间通信。

正文开始：

下载并解压飞凌厂商提供的iMX8MP内核源码压缩包分卷：

在虚拟机中合并压缩分卷并解压得出内核源码包文件夹OK8MP-linux-kernel，将文件夹使用tar打包并复制到TF卡文件系统中解压：

找到内核源码中的配置文件OK8MP-C_defconfig：

这个就是make选项，使用
make OK8MP-C_defconfig
指令即可配置编译选项：
make -j4
开始编译：
注意开始编译前需要安装常用软件：
apt install bison bc flex

增量编译完毕：

然后接下来就可以下载DPDK并运行rte_ring无锁环队列Demo应用，需要从
https://www.dpdk.org/
官网中下载DPDK 19.11.10 (LTS)长期支持版本：

在根目录下的mk/文件夹下找到名为rte_vars.mk设置文件，找到环境变量RTE_KERNELDIR，修改为上述的内核源码路径：

1.RTE_KERNELDIR ?= /home/OK8MP-linux-kernel/
进入usertools文件夹，找到dpdk-setup.sh脚本并运行

选择8，ARM64-armv8a-linuxapp-gcc，

这个选项会使dpdk的gcc交叉编译链生成适用于armv8a处理器的外部库，外部库中有kmod和lib等ko文件和so文件，

是用于第三方程序开发和运行的：

使用指令
insmod /home/dpdk-stable-19.11.10/arm64-armv8a-linuxapp-gcc/kmod/igb_uio.ko
加载igb_uio.ko驱动文件，这是进行dpdk开发必备的步骤：

然后是使用dpdk-devbind.py脚本手动进行hugepage大页内存绑定，此处为numa方式：

此举会将/mnt/huge文件mount成hugepage映射文件，并实实在在地占用内存空间：

准备工作完成，我们接下来可以进行rte_ring无锁环队列Demo代码的编写，但是在编写之前，需要对无锁环队列有一个基本的认识：https://blog.csdn.net/chen98765432101/article/details/69367633
无论是dpdk第三方开发的rte_ring还是Linux内核中本就存在的无锁环队列，其基本原理类似，在一条分配好的队列型内存空间中，读写方式为FIFO（先进先出），读和写的动作分别有两个进程或两个线程进行，写进程不断往地址自增的内存位置写入数据，读进程不断读取地址自增的内存位置的数据，当写位置的内存地址已为队列中内存的最高值时，需要释放队列中内存地址最低值的空间供写进程继续写，方式仍与上一周期相同（不断往地址自增的内存位置写入数据），释放过程需要保证对末尾内存地址空间的锁定与解锁，避免读写过程出错。而不同的是，Linux内核中的无锁环队列，地址管理和读写控制均由内核进行，而dpdk的rte_ring则由dpdk内部的控制器进行，因为dpdk这一模块完整地接管了所分配内存空间的管理权，是直接绕过Linux内核进行管理的，内核也无权访问dpdk控制器的具体管理细节。

编写无锁环队列两个进程的Demo，先写Primary进程：

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#include
#include

#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1

static const char *_MSG_POOL = "MSG_POOL";
static const char *_SEC_2_PRI = "SEC_2_PRI";
static const char *_PRI_2_SEC = "PRI_2_SEC";
static const char *_PRI_2_THI = "PRI_2_THI";

struct rte_ring *send_ring, *recv_ring , *send_ring_third;
struct rte_mempool *message_pool;
volatile int quit = 0;

static void * lcore_recv(void *arg)
{
unsigned lcore_id = rte_lcore_id();

printf("Starting core %un", lcore_id);
while (!quit){
void *msg;
if (rte_ring_dequeue(recv_ring, &msg) < 0)
{
usleep(5);
continue;
}
printf("lcore_id = %d Received '%s'n" , lcore_id , (char *)msg);
rte_mempool_put(message_pool , msg);
}

return 0;
}

int string_size = 100;
int elt_size = 128;
pthread_t id1;

int main(int argc, char **argv)
{
const unsigned flags = 0;
const unsigned ring_size = 64;
const unsigned pool_size = 1024;
const unsigned pool_cache = 32;
const unsigned priv_data_sz = 0;

int ret;
unsigned lcore_id;

ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Cannot init EALn");

send_ring = rte_ring_create(_PRI_2_SEC, ring_size, rte_socket_id(), flags);
recv_ring = rte_ring_create(_SEC_2_PRI, ring_size, rte_socket_id(), flags);
send_ring_third = rte_ring_create(_PRI_2_THI, ring_size, rte_socket_id(), flags);
message_pool = rte_mempool_create(_MSG_POOL, pool_size,
elt_size, pool_cache, priv_data_sz,
NULL, NULL, NULL, NULL,
rte_socket_id(), flags);

if (send_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting sending ringn");

if (recv_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting receiving ringn");

if (send_ring_third == NULL)
rte_exit(EXIT_FAILURE, "Problem getting send_ring_thirdn");

if (message_pool == NULL)
rte_exit(EXIT_FAILURE, "Problem getting message pooln");

pthread_create(&id1 , NULL , lcore_recv , NULL);
while(1)
{
void *msg = NULL;
if (rte_mempool_get(message_pool, &msg) < 0)
continue;

snprintf((char *)msg, string_size, "%s", "primary to secondary");
if (rte_ring_enqueue(send_ring , msg) < 0)
{
rte_mempool_put(message_pool, msg);
}

if (rte_mempool_get(message_pool, &msg) < 0)
continue;

snprintf((char *)msg, string_size, "%s", "primary to third");
if (rte_ring_enqueue(send_ring_third , msg) < 0)
{
rte_mempool_put(message_pool, msg);
}

sleep(1);
}

return 0;
}

注意在Makefile文件里面要关闭WERROR相关编译选项：
# 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.

ifeq ($(RTE_SDK),)
$(error "Please define RTE_SDK environment variable")
endif

# Default target, can be overridden by command line or environment
RTE_TARGET ?= arm64-armv8a-linuxapp-gcc

include $(RTE_SDK)/mk/rte.vars.mk

# binary name
APP = rte_ring_primary

# all source are stored in SRCS-y
SRCS-y := main.c

CFLAGS += -O0
CFLAGS +=

include $(RTE_SDK)/mk/rte.extapp.mk

Secondary进程：#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#include
#include

#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1

static const char *_MSG_POOL = "MSG_POOL";
static const char *_SEC_2_PRI = "SEC_2_PRI";
static const char *_PRI_2_SEC = "PRI_2_SEC";

struct rte_ring *send_ring, *recv_ring;
struct rte_mempool *message_pool;
volatile int quit = 0;
int string_size = 100;

static int lcore_send(__attribute__((unused)) void *arg)
{
unsigned lcore_id = rte_lcore_id();

while(1)
{
void *msg = NULL;
if (rte_mempool_get(message_pool, &msg) < 0)
continue;

snprintf((char *)msg , string_size , "%s", "secondary to primary");
if (rte_ring_enqueue(send_ring , msg) < 0)
{
rte_mempool_put(message_pool, msg);
}
sleep(1);
}
return 0;
}

pthread_t id1;

int main(int argc, char **argv)
{
const unsigned flags = 0;
const unsigned ring_size = 64;
const unsigned pool_size = 1024;
const unsigned pool_cache = 32;
const unsigned priv_data_sz = 0;

int ret;
unsigned lcore_id;
ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Cannot init EALn");

recv_ring = rte_ring_lookup(_PRI_2_SEC);
send_ring = rte_ring_lookup(_SEC_2_PRI);
message_pool = rte_mempool_lookup(_MSG_POOL);

if (send_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting sending ringn");
if (recv_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting receiving ringn");
if (message_pool == NULL)
rte_exit(EXIT_FAILURE, "Problem getting message pooln");

pthread_create(&id1 , NULL , lcore_send , NULL);
while (1)
{
lcore_id = rte_lcore_id();
void * msg = NULL;
if (rte_ring_dequeue(recv_ring, &msg) < 0)
{
usleep(5);
continue;
}

printf("lcore_id = %d Received: %sn" , lcore_id , (char *)msg);

rte_mempool_put(message_pool, msg);
}

return 0;
}

同样在Makefile文件里面要关闭WERROR相关编译选项：# 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.

ifeq ($(RTE_SDK),)
$(error "Please define RTE_SDK environment variable")
endif

# Default target, can be overridden by command line or environment
RTE_TARGET ?= arm64-armv8a-linuxapp-gcc

include $(RTE_SDK)/mk/rte.vars.mk

# binary name
APP = rte_ring_secondary

# all source are stored in SRCS-y
SRCS-y := main.c

CFLAGS += -O3
CFLAGS += $()

include $(RTE_SDK)/mk/rte.extapp.mk

运行，这里说一下，基于rte_ring的进程间通信，Secondary进程最好是使用auto类型：
./rte_ring_primary --proc-type primary
./rte_ring_secondary --proc-type auto
运行效果：

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飞凌嵌入式iMX8MP 开发板试用体验--编译内核源码&编译DPDK源码实现rte_ring无锁环队列进程间通信

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