[PATCH] child process synchronization NIC startup parameters

[Yang, Qiming]

Hi, kaisen
Your patch missed prefix app/test.

> -----Original Message-----
> From: You, KaisenX <kaisenx.you at intel.com>
> Sent: Wednesday, July 5, 2023 5:35 PM
> To: dev at dpdk.org
> Cc: Yang, Qiming <qiming.yang at intel.com>; Zhou, YidingX
> <yidingx.zhou at intel.com>; You, KaisenX <kaisenx.you at intel.com>;
> stable at dpdk.org
> Subject: [PATCH] child process synchronization NIC startup parameters
> 
> In meson_test, because the child process does not synchronize the NIC
> startup parameters of the parent process at startup, it uses all NICs bound by
> vfio as startup parameters by default, and an exception occurs in the
> subsequent hugefile check, causing the test to fail. Synchronize the NIC
> startup parameters of the parent process to the child process to solve this
> problem.
> 
> Fixes: 786b29255c49 ("test: fix file prefix discovery")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Kaisen You <kaisenx.you at intel.com>
> ---
>  app/test/process.h | 80
> ++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 77 insertions(+), 3 deletions(-)
> 
> diff --git a/app/test/process.h b/app/test/process.h index
> 1f073b9c5c..c8a15e8989 100644
> --- a/app/test/process.h
> +++ b/app/test/process.h
> @@ -15,9 +15,11 @@
>  #include <string.h> /* strerror */
>  #include <unistd.h> /* readlink */
>  #include <dirent.h>
> +#include <fcntl.h>
> 
>  #include <rte_string_fns.h> /* strlcpy */
> 
> +#define MAX_EXTRA_ARGS 32
>  #ifdef RTE_EXEC_ENV_FREEBSD
>  #define self "curproc"
>  #define exe "file"
> @@ -34,6 +36,50 @@ extern uint16_t flag_for_send_pkts;  #endif  #endif
> 
> +/* get cmdline form PID. Read process info form /proc/$PID. */ static
> +char *get_cmdline_from_pid(pid_t pid, char *buf, int len) {
> +	char filename[PATH_MAX];
> +	char *name = NULL;
> +	int fd;
> +	int ret;
> +
> +	if (pid < 1 || buf == NULL || len < 0) {
> +		printf("%s: illegal param\n", __func__);
> +		return NULL;
> +	}
> +
> +	snprintf(filename, PATH_MAX, "/proc/%d/cmdline", pid);
> +	memset(buf, 0, len);
> +	fd = open(filename, O_RDONLY);
> +	if (fd < 0) {
> +		perror("open:");
> +		return NULL;
> +	}
> +	ret = read(fd, buf, len);
> +	close(fd);
> +
> +	if (ret < 0)
> +		return NULL;
> +
> +	if (buf[ret-1] == '\n')
> +		buf[--ret] = 0;
> +
> +	name = buf;
> +	while (ret) {
> +		if (((unsigned char)*name) < ' ')
> +			*name = ' ';
> +		name++;
> +		ret--;
> +	}
> +	*name = 0;
> +
> +	if (buf[0])
> +		return buf;
> +
> +	return NULL;
> +}
> +
>  /*
>   * launches a second copy of the test process using the given argv
> parameters,
>   * which should include argv[0] as the process name. To identify in the @@ -
> 44,9 +90,15 @@ static inline int  process_dup(const char *const argv[], int
> numargs, const char *env_value)  {
>  	int num;
> -	char *argv_cpy[numargs + 1];
> -	int i, status;
> +	char *argv_cpy[MAX_EXTRA_ARGS];
> +	int i, status, n, s, j;
>  	char path[32];
> +	char buf[1024];
> +	char *token;
> +	char str_1[] = "-a";
> +	char str_2[] = " ";
> +	char *argv_str[MAX_EXTRA_ARGS];
> +	char *argv_copy[MAX_EXTRA_ARGS];
>  #ifdef RTE_LIB_PDUMP
>  #ifdef RTE_NET_RING
>  	pthread_t thread;
> @@ -113,10 +165,32 @@ process_dup(const char *const argv[], int numargs,
> const char *env_value)
>  			closedir(dir);
>  		}
>  #endif
> +		/* Add the -a parameter to the child process start parameter
> */
> +		get_cmdline_from_pid(getppid(), buf, 1024);
> +		token = strtok(buf, str_2);
> +		argv_str[0] = strdup(token);
> +		n = 0;
> +		j = 0;
> +		while (token != NULL) {
> +			n = n + 1;
> +			argv_str[n] = strdup(token);
> +			token = strtok(NULL, str_2);
> +		}
> +		for (s = 0; s < n; s++) {
> +			if (strcmp(argv_str[s], str_1) == 0 ||
> +				strcmp(argv_str[s + 1], str_1) == 0) {
> +				argv_copy[j] = strdup(argv_str[s + 1]);
> +				j++;
> +			}
> +		}
> +		for (s = 0; s < j; s++)
> +			argv_cpy[numargs + s] = strdup(argv_copy[s]);
> +
>  		printf("Running binary with argv[]:");
> -		for (i = 0; i < num; i++)
> +		for (i = 0; i < num + j; i++)
>  			printf("'%s' ", argv_cpy[i]);
>  		printf("\n");
> +		argv_cpy[numargs + j] = NULL;
>  		fflush(stdout);
> 
>  		/* set the environment variable */
> --
> 2.25.1