FETMX8MP-C核心板基于NXP i.MX 8M Plus處理器開發設計，該系列處理器專注于機器學習與視覺、高級多媒體以及具有高可靠性的工業自動化。旨在滿足智慧城市、工業互聯網、智能醫療、智慧交通等應用的需求。 ·強大的四核或雙核Arm? Cortex?-A53處理器，主頻高達1.6GHz，帶有神經處理 單元(NPU)，最高運行速率可達2.3 TOPS。

本文主要介紹編譯內核源碼&編譯DPDK源碼實現rte_ring無鎖環隊列進程間通信。

正文開始：

下載并解壓飛凌廠商提供的iMX8MP內核源碼壓縮包分卷：


在虛擬機中合并壓縮分卷并解壓得出內核源碼包文件夾OK8MP-linux-kernel，將文件夾使用tar打包并復制到TF卡文件系統中解壓：


找到內核源碼中的配置文件OK8MP-C_defconfig：



這個就是make選項，使用
make OK8MP-C_defconfig
指令即可配置編譯選項：
make -j4
開始編譯：
注意開始編譯前需要安裝常用軟件：
apt install bison bc flex





增量編譯完畢：



然后接下來就可以下載DPDK并運行rte_ring無鎖環隊列Demo應用，需要從
Home - DPDK
官網中下載DPDK 19.11.10 (LTS)長期支持版本：


在根目錄下的mk/文件夾下找到名為rte_vars.mk設置文件，找到環境變量RTE_KERNELDIR，修改為上述的內核源碼路徑：


1.RTE_KERNELDIR ?= /home/OK8MP-linux-kernel/
進入usertools文件夾，找到dpdk-setup.sh腳本并運行


選擇8，ARM64-armv8a-linuxapp-gcc，

這個選項會使dpdk的gcc交叉編譯鏈生成適用于armv8a處理器的外部庫，外部庫中有kmod和lib等ko文件和so文件，

是用于第三方程序開發和運行的：

使用指令
insmod /home/dpdk-stable-19.11.10/arm64-armv8a-linuxapp-gcc/kmod/igb_uio.ko
加載igb_uio.ko驅動文件，這是進行dpdk開發必備的步驟：

然后是使用dpdk-devbind.py腳本手動進行hugepage大頁內存綁定，此處為numa方式：

此舉會將/mnt/huge文件mount成hugepage映射文件，并實實在在地占用內存空間：



準備工作完成，我們接下來可以進行rte_ring無鎖環隊列Demo代碼的編寫，但是在編寫之前，需要對無鎖環隊列有一個基本的認識：深入理解dpdk rte_ring無鎖隊列_NTF的博客-CSDN博客_rte_ring_create
無論是dpdk第三方開發的rte_ring還是Linux內核中本就存在的無鎖環隊列，其基本原理類似，在一條分配好的隊列型內存空間中，讀寫方式為FIFO（先進先出），讀和寫的動作分別有兩個進程或兩個線程進行，寫進程不斷往地址自增的內存位置寫入數據，讀進程不斷讀取地址自增的內存位置的數據，當寫位置的內存地址已為隊列中內存的最高值時，需要釋放隊列中內存地址最低值的空間供寫進程繼續寫，方式仍與上一周期相同（不斷往地址自增的內存位置寫入數據），釋放過程需要保證對末尾內存地址空間的鎖定與解鎖，避免讀寫過程出錯。而不同的是，Linux內核中的無鎖環隊列，地址管理和讀寫控制均由內核進行，而dpdk的rte_ring則由dpdk內部的控制器進行，因為dpdk這一模塊完整地接管了所分配內存空間的管理權，是直接繞過Linux內核進行管理的，內核也無權訪問dpdk控制器的具體管理細節。




編寫無鎖環隊列兩個進程的Demo，先寫Primary進程：

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <sys/queue.h>

#include <rte_mempool.h>
#include <rte_lcore.h>

#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 %u\n", 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 EAL\n");

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 ring\n");

if (recv_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting receiving ring\n");

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

if (message_pool == NULL)
rte_exit(EXIT_FAILURE, "Problem getting message pool\n");

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文件里面要關閉WERROR相關編譯選項：
#? ?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進程：#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <sys/queue.h>

#include <rte_mempool.h>
#include <rte_lcore.h>

#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 EAL\n");

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 ring\n");
if (recv_ring == NULL)
rte_exit(EXIT_FAILURE, "Problem getting receiving ring\n");
if (message_pool == NULL)
rte_exit(EXIT_FAILURE, "Problem getting message pool\n");

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: %s\n" , lcore_id , (char *)msg);

rte_mempool_put(message_pool, msg);
}

return 0;
}

同樣在Makefile文件里面要關閉WERROR相關編譯選項：#? ?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

運行，這里說一下，基于rte_ring的進程間通信，Secondary進程最好是使用auto類型：
./rte_ring_primary --proc-type primary
./rte_ring_secondary --proc-type auto
運行效果：


原文鏈接：飛凌嵌入式iMX8MP 開發板試用體驗--編譯內核源碼&編譯DPDK源碼實現rte_ring無鎖環隊列進程間通信 - 飛凌嵌入式行業資訊 - 保定飛凌嵌入式技術有限公司

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