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Date: Thu, 11 Jan 2018 13:05:17 -0800
From: Martin KaFai Lau <kafai@...com>
To: John Fastabend <john.fastabend@...il.com>
CC: <borkmann@...earbox.net>, <ast@...nel.org>,
<netdev@...r.kernel.org>
Subject: Re: [bpf-next PATCH v2 1/7] bpf: refactor sockmap sample program
update for arg parsing
On Wed, Jan 10, 2018 at 10:39:04AM -0800, John Fastabend wrote:
> sockmap sample program takes arguments from cmd line but it reads them
> in using offsets into the array. Because we want to add more arguments
> in the future lets do proper argument handling.
>
> Also refactor code to pull apart sock init and ping/pong test. This
> allows us to add new tests in the future.
>
> Signed-off-by: John Fastabend <john.fastabend@...il.com>
> ---
> samples/sockmap/sockmap_user.c | 142 +++++++++++++++++++++++++++++-----------
> 1 file changed, 103 insertions(+), 39 deletions(-)
>
> diff --git a/samples/sockmap/sockmap_user.c b/samples/sockmap/sockmap_user.c
> index 7cc9d22..5cbe7a5 100644
> --- a/samples/sockmap/sockmap_user.c
> +++ b/samples/sockmap/sockmap_user.c
> @@ -35,6 +35,8 @@
> #include <assert.h>
> #include <libgen.h>
>
> +#include <getopt.h>
> +
> #include "../bpf/bpf_load.h"
> #include "../bpf/bpf_util.h"
> #include "../bpf/libbpf.h"
> @@ -46,15 +48,39 @@
> #define S1_PORT 10000
> #define S2_PORT 10001
>
> -static int sockmap_test_sockets(int rate, int dot)
> +/* global sockets */
> +int s1, s2, c1, c2, p1, p2;
> +
> +static const struct option long_options[] = {
> + {"help", no_argument, NULL, 'h' },
> + {"cgroup", required_argument, NULL, 'c' },
> + {"rate", required_argument, NULL, 'r' },
> + {"verbose", no_argument, NULL, 'v' },
> + {0, 0, NULL, 0 }
> +};
> +
> +static void usage(char *argv[])
> +{
> + int i;
> +
> + printf(" Usage: %s --cgroup <cgroup_path>\n", argv[0]);
> + printf(" options:\n");
> + for (i = 0; long_options[i].name != 0; i++) {
> + printf(" --%-12s", long_options[i].name);
> + if (long_options[i].flag != NULL)
> + printf(" flag (internal value:%d)\n",
> + *long_options[i].flag);
> + else
> + printf(" -%c\n", long_options[i].val);
> + }
> + printf("\n");
> +}
> +
> +static int sockmap_init_sockets(void)
> {
> - int i, sc, err, max_fd, one = 1;
> - int s1, s2, c1, c2, p1, p2;
> + int i, err, one = 1;
> struct sockaddr_in addr;
> - struct timeval timeout;
> - char buf[1024] = {0};
> int *fds[4] = {&s1, &s2, &c1, &c2};
> - fd_set w;
>
> s1 = s2 = p1 = p2 = c1 = c2 = 0;
>
> @@ -134,6 +160,8 @@ static int sockmap_test_sockets(int rate, int dot)
> if (err < 0 && errno != EINPROGRESS) {
> perror("connect c2 failed()\n");
> goto out;
> + } else if (err < 0) {
> + err = 0;
> }
>
> /* Accept Connecrtions */
> @@ -149,23 +177,32 @@ static int sockmap_test_sockets(int rate, int dot)
> goto out;
> }
>
> - max_fd = p2;
> - timeout.tv_sec = 10;
> - timeout.tv_usec = 0;
> -
> printf("connected sockets: c1 <-> p1, c2 <-> p2\n");
> printf("cgroups binding: c1(%i) <-> s1(%i) - - - c2(%i) <-> s2(%i)\n",
> c1, s1, c2, s2);
> +out:
> + return err;
err is not updated with p1 and p2 in the case that accept() errors out.
> +}
> +
> +static int forever_ping_pong(int rate, int verbose)
> +{
> + struct timeval timeout;
> + char buf[1024] = {0};
> + int sc;
> +
> + timeout.tv_sec = 10;
> + timeout.tv_usec = 0;
>
> /* Ping/Pong data from client to server */
> sc = send(c1, buf, sizeof(buf), 0);
> if (sc < 0) {
> perror("send failed()\n");
> - goto out;
> + return sc;
> }
>
> do {
> - int s, rc, i;
> + int s, rc, i, max_fd = p2;
> + fd_set w;
>
> /* FD sets */
> FD_ZERO(&w);
> @@ -193,7 +230,7 @@ static int sockmap_test_sockets(int rate, int dot)
> if (rc < 0) {
> if (errno != EWOULDBLOCK) {
> perror("recv failed()\n");
> - break;
> + return rc;
> }
> }
>
> @@ -205,35 +242,60 @@ static int sockmap_test_sockets(int rate, int dot)
> sc = send(i, buf, rc, 0);
> if (sc < 0) {
> perror("send failed()\n");
> - break;
> + return sc;
> }
> }
> - sleep(rate);
> - if (dot) {
> +
> + if (rate)
> + sleep(rate);
> +
> + if (verbose) {
> printf(".");
> fflush(stdout);
>
> }
> } while (running);
>
> -out:
> - close(s1);
> - close(s2);
> - close(p1);
> - close(p2);
> - close(c1);
> - close(c2);
> - return err;
> + return 0;
> }
>
> int main(int argc, char **argv)
> {
> - int rate = 1, dot = 1;
> + int rate = 1, verbose = 0;
> + int opt, longindex, err, cg_fd = 0;
> char filename[256];
> - int err, cg_fd;
> - char *cg_path;
>
> - cg_path = argv[argc - 1];
> + while ((opt = getopt_long(argc, argv, "hvc:r:",
> + long_options, &longindex)) != -1) {
> + switch (opt) {
> + /* Cgroup configuration */
> + case 'c':
> + cg_fd = open(optarg, O_DIRECTORY, O_RDONLY);
> + if (cg_fd < 0) {
> + fprintf(stderr, "ERROR: (%i) open cg path failed: %s\n",
> + cg_fd, optarg);
> + return cg_fd;
> + }
> + break;
> + case 'r':
> + rate = atoi(optarg);
> + break;
> + case 'v':
> + verbose = 1;
> + break;
> + case 'h':
> + default:
> + usage(argv);
> + return -1;
> + }
> + }
> +
> + if (!cg_fd) {
> + fprintf(stderr, "%s requires cgroup option: --cgroup <path>\n",
> + argv[0]);
> + return -1;
> + }
> +
> snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
>
> running = 1;
> @@ -247,14 +309,6 @@ int main(int argc, char **argv)
> return 1;
> }
>
> - /* Cgroup configuration */
> - cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
> - if (cg_fd < 0) {
> - fprintf(stderr, "ERROR: (%i) open cg path failed: %s\n",
> - cg_fd, cg_path);
> - return cg_fd;
> - }
> -
> /* Attach programs to sockmap */
> err = bpf_prog_attach(prog_fd[0], map_fd[0],
> BPF_SK_SKB_STREAM_PARSER, 0);
> @@ -280,15 +334,25 @@ int main(int argc, char **argv)
> return err;
> }
>
> - err = sockmap_test_sockets(rate, dot);
> + err = sockmap_init_sockets();
> if (err) {
> fprintf(stderr, "ERROR: test socket failed: %d\n", err);
> - return err;
> + goto out;
> }
> - return 0;
> +
> + err = forever_ping_pong(rate, verbose);
> +out:
> + close(s1);
> + close(s2);
> + close(p1);
> + close(p2);
> + close(c1);
> + close(c2);
> + return err;
> }
>
> void running_handler(int a)
> {
> running = 0;
> + printf("\n");
> }
>
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