Re: [PATCH net-next v2 11/12] test/vsock: MSG_ZEROCOPY support for vsock_perf

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On Sun, Oct 01, 2023 at 12:03:07AM +0300, Arseniy Krasnov wrote:
To use this option pass '--zc' parameter:

--zerocopy would be better IMHO


./vsock_perf --zc --sender <cid> --port <port> --bytes <bytes to send>

With this option MSG_ZEROCOPY flag will be passed to the 'send()' call.

Signed-off-by: Arseniy Krasnov <avkrasnov@xxxxxxxxxxxxxxxxx>
---
tools/testing/vsock/vsock_perf.c | 143 +++++++++++++++++++++++++++++--
1 file changed, 134 insertions(+), 9 deletions(-)

diff --git a/tools/testing/vsock/vsock_perf.c b/tools/testing/vsock/vsock_perf.c
index a72520338f84..f0f183f3f9e8 100644
--- a/tools/testing/vsock/vsock_perf.c
+++ b/tools/testing/vsock/vsock_perf.c
@@ -18,6 +18,8 @@
#include <poll.h>
#include <sys/socket.h>
#include <linux/vm_sockets.h>
+#include <sys/mman.h>
+#include <linux/errqueue.h>

#define DEFAULT_BUF_SIZE_BYTES	(128 * 1024)
#define DEFAULT_TO_SEND_BYTES	(64 * 1024)
@@ -28,9 +30,18 @@
#define BYTES_PER_GB		(1024 * 1024 * 1024ULL)
#define NSEC_PER_SEC		(1000000000ULL)

+#ifndef SOL_VSOCK
+#define SOL_VSOCK	287
+#endif
+
+#ifndef VSOCK_RECVERR
+#define VSOCK_RECVERR	1
+#endif
+
static unsigned int port = DEFAULT_PORT;
static unsigned long buf_size_bytes = DEFAULT_BUF_SIZE_BYTES;
static unsigned long vsock_buf_bytes = DEFAULT_VSOCK_BUF_BYTES;
+static bool zerocopy;

static void error(const char *s)
{
@@ -247,15 +258,76 @@ static void run_receiver(unsigned long rcvlowat_bytes)
	close(fd);
}

+static void recv_completion(int fd)
+{
+	struct sock_extended_err *serr;
+	char cmsg_data[128];
+	struct cmsghdr *cm;
+	struct msghdr msg = { 0 };
+	ssize_t ret;
+
+	msg.msg_control = cmsg_data;
+	msg.msg_controllen = sizeof(cmsg_data);
+
+	ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
+	if (ret) {
+		fprintf(stderr, "recvmsg: failed to read err: %zi\n", ret);
+		return;
+	}
+
+	cm = CMSG_FIRSTHDR(&msg);
+	if (!cm) {
+		fprintf(stderr, "cmsg: no cmsg\n");
+		return;
+	}
+
+	if (cm->cmsg_level != SOL_VSOCK) {
+		fprintf(stderr, "cmsg: unexpected 'cmsg_level'\n");
+		return;
+	}
+
+	if (cm->cmsg_type != VSOCK_RECVERR) {
+		fprintf(stderr, "cmsg: unexpected 'cmsg_type'\n");
+		return;
+	}
+
+	serr = (void *)CMSG_DATA(cm);
+	if (serr->ee_origin != SO_EE_ORIGIN_ZEROCOPY) {
+		fprintf(stderr, "serr: wrong origin\n");
+		return;
+	}
+
+	if (serr->ee_errno) {
+		fprintf(stderr, "serr: wrong error code\n");
+		return;
+	}
+
+	if (zerocopy && (serr->ee_code & SO_EE_CODE_ZEROCOPY_COPIED))
+		fprintf(stderr, "warning: copy instead of zerocopy\n");
+}
+
+static void enable_so_zerocopy(int fd)
+{
+	int val = 1;
+
+	if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &val, sizeof(val)))
+		error("setsockopt(SO_ZEROCOPY)");
+}

We use enable_so_zerocopy() in a single place, maybe we can put this
code there.

Anyway it seems we are copy & paste some codes from util, etc.

Would make sense create a new header to use on both tests and perf?


+
static void run_sender(int peer_cid, unsigned long to_send_bytes)
{
	time_t tx_begin_ns;
	time_t tx_total_ns;
	size_t total_send;
+	time_t time_in_send;
	void *data;
	int fd;

-	printf("Run as sender\n");
+	if (zerocopy)
+		printf("Run as sender MSG_ZEROCOPY\n");
+	else
+		printf("Run as sender\n");
+
	printf("Connect to %i:%u\n", peer_cid, port);
	printf("Send %lu bytes\n", to_send_bytes);
	printf("TX buffer %lu bytes\n", buf_size_bytes);
@@ -265,38 +337,82 @@ static void run_sender(int peer_cid, unsigned long to_send_bytes)
	if (fd < 0)
		exit(EXIT_FAILURE);

-	data = malloc(buf_size_bytes);
+	if (zerocopy) {
+		enable_so_zerocopy(fd);

-	if (!data) {
-		fprintf(stderr, "'malloc()' failed\n");
-		exit(EXIT_FAILURE);
+		data = mmap(NULL, buf_size_bytes, PROT_READ | PROT_WRITE,
+			    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+		if (data == MAP_FAILED) {
+			perror("mmap");
+			exit(EXIT_FAILURE);
+		}
+	} else {
+		data = malloc(buf_size_bytes);
+
+		if (!data) {
+			fprintf(stderr, "'malloc()' failed\n");
+			exit(EXIT_FAILURE);
+		}
	}

	memset(data, 0, buf_size_bytes);
	total_send = 0;
+	time_in_send = 0;
	tx_begin_ns = current_nsec();

	while (total_send < to_send_bytes) {
		ssize_t sent;
+		size_t rest_bytes;
+		time_t before;

-		sent = write(fd, data, buf_size_bytes);
+		rest_bytes = to_send_bytes - total_send;
+
+		before = current_nsec();
+		sent = send(fd, data, (rest_bytes > buf_size_bytes) ?
+			    buf_size_bytes : rest_bytes,
+			    zerocopy ? MSG_ZEROCOPY : 0);
+		time_in_send += (current_nsec() - before);

		if (sent <= 0)
			error("write");

		total_send += sent;
+
+		if (zerocopy) {
+			struct pollfd fds = { 0 };
+
+			fds.fd = fd;
+
+			if (poll(&fds, 1, -1) < 0) {
+				perror("poll");
+				exit(EXIT_FAILURE);
+			}
+
+			if (!(fds.revents & POLLERR)) {
+				fprintf(stderr, "POLLERR expected\n");
+				exit(EXIT_FAILURE);
+			}
+
+			recv_completion(fd);
+		}
	}

	tx_total_ns = current_nsec() - tx_begin_ns;

	printf("total bytes sent: %zu\n", total_send);
	printf("tx performance: %f Gbits/s\n",
-	       get_gbps(total_send * 8, tx_total_ns));
-	printf("total time in 'write()': %f sec\n",
+	       get_gbps(total_send * 8, time_in_send));
+	printf("total time in tx loop: %f sec\n",
	       (float)tx_total_ns / NSEC_PER_SEC);
+	printf("time in 'send()': %f sec\n",
+	       (float)time_in_send / NSEC_PER_SEC);

	close(fd);
-	free(data);
+
+	if (zerocopy)
+		munmap(data, buf_size_bytes);
+	else
+		free(data);
}

static const char optstring[] = "";
@@ -336,6 +452,11 @@ static const struct option longopts[] = {
		.has_arg = required_argument,
		.val = 'R',
	},
+	{
+		.name = "zc",
+		.has_arg = no_argument,
+		.val = 'Z',
+	},
	{},
};

@@ -351,6 +472,7 @@ static void usage(void)
	       "  --help			This message\n"
	       "  --sender   <cid>		Sender mode (receiver default)\n"
	       "                                <cid> of the receiver to connect to\n"
+	       "  --zc				Enable zerocopy\n"

Should we specify that this is used only in the sender?

	       "  --port     <port>		Port (default %d)\n"
	       "  --bytes    <bytes>KMG		Bytes to send (default %d)\n"
	       "  --buf-size <bytes>KMG		Data buffer size (default %d). In sender mode\n"
@@ -413,6 +535,9 @@ int main(int argc, char **argv)
		case 'H': /* Help. */
			usage();
			break;
+		case 'Z': /* Zerocopy. */
+			zerocopy = true;
+			break;
		default:
			usage();
		}
--
2.25.1


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