以下是一个简单的Linux NVMe/TCP代码案例,用于连接到远程NVMe设备并进行读写操作:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/nvme_ioctl.h>
#define NVME_TCP_PORT 4420
#define BUFFER_SIZE 4096
int main() {
int sockfd, nvme_fd;
struct sockaddr_in server_addr;
char buffer[BUFFER_SIZE];
// 创建TCP socket
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("Failed to create socket");
return -1;
}
// 设置服务器地址和端口
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(NVME_TCP_PORT);
if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) <= 0) {
perror("Invalid server address");
return -1;
}
// 连接到服务器
if (connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
perror("Failed to connect to the server");
close(sockfd);
return -1;
}
// 打开NVMe设备文件
nvme_fd = open("/dev/nvme0n1", O_RDWR | O_DIRECT);
if (nvme_fd == -1) {
perror("Failed to open NVMe device file");
close(sockfd);
return -1;
}
// 发送读取请求
strcpy(buffer, "Hello, NVMe!");
if (send(sockfd, buffer, BUFFER_SIZE, 0) == -1) {
perror("Failed to send data");
close(nvme_fd);
close(sockfd);
return -1;
}
// 接收数据
memset(buffer, 0, sizeof(buffer));
if (recv(sockfd, buffer, BUFFER_SIZE, 0) == -1) {
perror("Failed to receive data");
close(nvme_fd);
close(sockfd);
return -1;
}
// 将接收到的数据写入NVMe设备
ssize_t n = write(nvme_fd, buffer, strlen(buffer));
if (n == -1) {
perror("Failed to write data to NVMe device");
close(nvme_fd);
close(sockfd);
return -1;
}
// 关闭文件和socket连接
close(nvme_fd);
close(sockfd);
return 0;
}
请注意,这只是一个简单示例,并且假设服务器在本地运行并监听4420端口。你需要根据实际情况进行修改,并确保你有足够的权限执行NVMe操作。此外,还要确保已加载适当的内核模块并启用了NVMe/TCP功能。
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