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下載并解壓飛凌廠商提供的iMX8MP內(nèi)核源碼壓縮包分卷：
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在虛擬機(jī)中合并壓縮分卷并解壓得出內(nèi)核源碼包文件夾OK8MP-linux-kernel，將文件夾使用tar打包并復(fù)制到TF卡文件系統(tǒng)中解壓：
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找到內(nèi)核源碼中的配置文件OK8MP-C_defconfig：
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這個(gè)就是make選項(xiàng)，使用
make OK8MP-C_defconfig
指令即可配置編譯選項(xiàng)：
make -j4
開(kāi)始編譯：
注意開(kāi)始編譯前需要安裝常用軟件：
apt install bison bc flex
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增量編譯完畢：
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然后接下來(lái)就可以下載DPDK并運(yùn)行rte_ring無(wú)鎖環(huán)隊(duì)列Demo應(yīng)用，需要從
https://www.dpdk.org/
官網(wǎng)中下載DPDK 19.11.10 (LTS)長(zhǎng)期支持版本：
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在根目錄下的mk/文件夾下找到名為rte_vars.mk設(shè)置文件，找到環(huán)境變量RTE_KERNELDIR，修改為上述的內(nèi)核源碼路徑：
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1.RTE_KERNELDIR ?= /home/OK8MP-linux-kernel/
進(jìn)入usertools文件夾，找到dpdk-setup.sh腳本并運(yùn)行
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選擇8，ARM64-armv8a-linuxapp-gcc，
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這個(gè)選項(xiàng)會(huì)使dpdk的gcc交叉編譯鏈生成適用于armv8a處理器的外部庫(kù)，外部庫(kù)中有kmod和lib等ko文件和so文件，
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是用于第三方程序開(kāi)發(fā)和運(yùn)行的：
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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(qū)動(dòng)文件，這是進(jìn)行dpdk開(kāi)發(fā)必備的步驟：
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然后是使用dpdk-devbind.py腳本手動(dòng)進(jìn)行hugepage大頁(yè)內(nèi)存綁定，此處為numa方式：
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此舉會(huì)將/mnt/huge文件mount成hugepage映射文件，并實(shí)實(shí)在在地占用內(nèi)存空間：
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準(zhǔn)備工作完成，我們接下來(lái)可以進(jìn)行rte_ring無(wú)鎖環(huán)隊(duì)列Demo代碼的編寫(xiě)，但是在編寫(xiě)之前，需要對(duì)無(wú)鎖環(huán)隊(duì)列有一個(gè)基本的認(rèn)識(shí)：https://blog.csdn.net/chen98765432101/article/details/69367633
無(wú)論是dpdk第三方開(kāi)發(fā)的rte_ring還是Linux內(nèi)核中本就存在的無(wú)鎖環(huán)隊(duì)列，其基本原理類似，在一條分配好的隊(duì)列型內(nèi)存空間中，讀寫(xiě)方式為FIFO（先進(jìn)先出），讀和寫(xiě)的動(dòng)作分別有兩個(gè)進(jìn)程或兩個(gè)線程進(jìn)行，寫(xiě)進(jìn)程不斷往地址自增的內(nèi)存位置寫(xiě)入數(shù)據(jù)，讀進(jìn)程不斷讀取地址自增的內(nèi)存位置的數(shù)據(jù)，當(dāng)寫(xiě)位置的內(nèi)存地址已為隊(duì)列中內(nèi)存的最高值時(shí)，需要釋放隊(duì)列中內(nèi)存地址最低值的空間供寫(xiě)進(jìn)程繼續(xù)寫(xiě)，方式仍與上一周期相同（不斷往地址自增的內(nèi)存位置寫(xiě)入數(shù)據(jù)），釋放過(guò)程需要保證對(duì)末尾內(nèi)存地址空間的鎖定與解鎖，避免讀寫(xiě)過(guò)程出錯(cuò)。而不同的是，Linux內(nèi)核中的無(wú)鎖環(huán)隊(duì)列，地址管理和讀寫(xiě)控制均由內(nèi)核進(jìn)行，而dpdk的rte_ring則由dpdk內(nèi)部的控制器進(jìn)行，因?yàn)閐pdk這一模塊完整地接管了所分配內(nèi)存空間的管理權(quán)，是直接繞過(guò)Linux內(nèi)核進(jìn)行管理的，內(nèi)核也無(wú)權(quán)訪問(wèn)dpdk控制器的具體管理細(xì)節(jié)。
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編寫(xiě)無(wú)鎖環(huán)隊(duì)列兩個(gè)進(jìn)程的Demo，先寫(xiě)Primary進(jìn)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 %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(guān)閉WERROR相關(guān)編譯選項(xiàng)：
# 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(jìn)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 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(guān)閉WERROR相關(guān)編譯選項(xiàng)：# 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:
#
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(yùn)行，這里說(shuō)一下，基于rte_ring的進(jìn)程間通信，Secondary進(jìn)程最好是使用auto類型：
./rte_ring_primary --proc-type primary
./rte_ring_secondary --proc-type auto
運(yùn)行效果：
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原文鏈接：https://www.forlinx.com/article_view_789.html
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發(fā)表于 2021-11-24 15:54:46
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