[RFC,v1,3/3] test/vsock: vsock_perf utility

  This adds utility to check vsock receive performance.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
 tools/testing/vsock/Makefile     |   1 +
 tools/testing/vsock/vsock_perf.c | 386 +++++++++++++++++++++++++++++++
 2 files changed, 387 insertions(+)
 create mode 100644 tools/testing/vsock/vsock_perf.c

-- 
2.25.1
  

On Tue, Nov 15, 2022 at 08:54:05PM +0000, Arseniy Krasnov wrote:
>This adds utility to check vsock receive performance.

A small example on how to use it here in the commit message would be 
nice.

>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>---
> tools/testing/vsock/Makefile     |   1 +

Please, can you also update tools/testing/vsock/README ?

> tools/testing/vsock/vsock_perf.c | 386 +++++++++++++++++++++++++++++++
> 2 files changed, 387 insertions(+)
> create mode 100644 tools/testing/vsock/vsock_perf.c
>
>diff --git a/tools/testing/vsock/Makefile b/tools/testing/vsock/Makefile
>index f8293c6910c9..d36fdd59fe2e 100644
>--- a/tools/testing/vsock/Makefile
>+++ b/tools/testing/vsock/Makefile
>@@ -3,6 +3,7 @@ all: test
> test: vsock_test vsock_diag_test
> vsock_test: vsock_test.o timeout.o control.o util.o
> vsock_diag_test: vsock_diag_test.o timeout.o control.o util.o
>+vsock_perf: vsock_perf.o
>
> CFLAGS += -g -O2 -Werror -Wall -I. -I../../include -I../../../usr/include -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -D_GNU_SOURCE
> .PHONY: all test clean
>diff --git a/tools/testing/vsock/vsock_perf.c b/tools/testing/vsock/vsock_perf.c
>new file mode 100644
>index 000000000000..ca7af08dca46
>--- /dev/null
>+++ b/tools/testing/vsock/vsock_perf.c
>@@ -0,0 +1,386 @@
>+// SPDX-License-Identifier: GPL-2.0-only
>+/*
>+ * vsock_perf - benchmark utility for vsock.
>+ *
>+ * Copyright (C) 2022 SberDevices.
>+ *
>+ * Author: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>+ */
>+#include <getopt.h>
>+#include <stdio.h>
>+#include <stdlib.h>
>+#include <stdbool.h>
>+#include <string.h>
>+#include <errno.h>
>+#include <unistd.h>
>+#include <time.h>
>+#include <sys/mman.h>
>+#include <stdint.h>
>+#include <poll.h>
>+#include <sys/socket.h>
>+#include <linux/vm_sockets.h>
>+
>+#define DEFAULT_BUF_SIZE_BYTES	(128*1024)
>+#define DEFAULT_TO_SEND_BYTES	(64*1024)
>+#define DEFAULT_VSOCK_BUF_BYTES (256*1024)

checkpatch suggests to put spaces around '*' (e.g. 128 * 1024)

>+#define DEFAULT_RCVLOWAT_BYTES	1
>+#define DEFAULT_PORT		1234
>+
>+#define BYTES_PER_GB		(1024 * 1024 * 1024ULL)
>+#define NSEC_PER_SEC		(1000000000ULL)
>+
>+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 inline time_t current_nsec(void)
>+{
>+	struct timespec ts;
>+
>+	if (clock_gettime(CLOCK_REALTIME, &ts)) {
>+		perror("clock_gettime");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	return (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
>+}
>+
>+/* From lib/cmdline.c. */
>+static unsigned long memparse(const char *ptr)
>+{
>+	char *endptr;
>+
>+	unsigned long long ret = strtoull(ptr, &endptr, 0);
>+
>+	switch (*endptr) {
>+	case 'E':
>+	case 'e':
>+		ret <<= 10;
>+	case 'P':
>+	case 'p':
>+		ret <<= 10;
>+	case 'T':
>+	case 't':
>+		ret <<= 10;
>+	case 'G':
>+	case 'g':
>+		ret <<= 10;
>+	case 'M':
>+	case 'm':
>+		ret <<= 10;
>+	case 'K':
>+	case 'k':
>+		ret <<= 10;
>+		endptr++;
>+	default:
>+		break;
>+	}
>+
>+	return ret;
>+}
>+
>+static void vsock_increase_buf_size(int fd)
>+{
>+	if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_MAX_SIZE,
>+		       &vsock_buf_bytes, sizeof(vsock_buf_bytes))) {
>+		perror("setsockopt");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE,
>+		       &vsock_buf_bytes, sizeof(vsock_buf_bytes))) {
>+		perror("setsockopt");
>+		exit(EXIT_FAILURE);
>+	}
>+}
>+
>+static int vsock_connect(unsigned int cid, unsigned int port)
>+{
>+	union {
>+		struct sockaddr sa;
>+		struct sockaddr_vm svm;
>+	} addr = {
>+		.svm = {
>+			.svm_family = AF_VSOCK,
>+			.svm_port = port,
>+			.svm_cid = cid,
>+		},
>+	};
>+	int fd;
>+
>+	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
>+
>+	if (fd < 0)
>+		return -1;
>+
>+	vsock_increase_buf_size(fd);
>+
>+	if (connect(fd, &addr.sa, sizeof(addr.svm)) < 0) {
>+		close(fd);
>+		return -1;
>+	}
>+
>+	return fd;
>+}
>+
>+static float get_gbps(unsigned long bytes, time_t ns_delta)
>+{
>+	return ((float)bytes / BYTES_PER_GB) /
>+	       ((float)ns_delta / NSEC_PER_SEC);
>+}
>+
>+static void run_sender(unsigned long to_send_bytes)
>+{
>+	time_t tx_begin_ns;
>+	size_t total_send;
>+	int client_fd;
>+	char *data;
>+	int fd;
>+	union {
>+		struct sockaddr sa;
>+		struct sockaddr_vm svm;
>+	} addr = {
>+		.svm = {
>+			.svm_family = AF_VSOCK,
>+			.svm_port = port,
>+			.svm_cid = VMADDR_CID_ANY,
>+		},
>+	};
>+	union {
>+		struct sockaddr sa;
>+		struct sockaddr_vm svm;
>+	} clientaddr;
>+
>+	socklen_t clientaddr_len = sizeof(clientaddr.svm);
>+
>+	fprintf(stderr, "Run as sender\n");
>+	fprintf(stderr, "Listen port %u\n", port);
>+	fprintf(stderr, "Send %lu bytes\n", to_send_bytes);
>+	fprintf(stderr, "TX buffer %lu bytes\n", buf_size_bytes);
>+	fprintf(stderr, "Peer buffer %lu bytes\n", vsock_buf_bytes);

Why using stderr for this prints?

Also in other places, I think we can use stdout for this kind on prints.

>+
>+	fd = socket(AF_VSOCK, SOCK_STREAM, 0);
>+
>+	if (fd < 0) {
>+		perror("socket");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (bind(fd, &addr.sa, sizeof(addr.svm)) < 0) {
>+		perror("bind");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (listen(fd, 1) < 0) {
>+		perror("listen");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	client_fd = accept(fd, &clientaddr.sa, &clientaddr_len);
>+
>+	if (client_fd < 0) {
>+		perror("accept");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	vsock_increase_buf_size(client_fd);
>+
>+	data = malloc(buf_size_bytes);
>+
>+	if (!data) {
>+		fprintf(stderr, "malloc failed\n");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	memset(data, 0, buf_size_bytes);
>+	total_send = 0;
>+	tx_begin_ns = current_nsec();
>+
>+	while (total_send < to_send_bytes) {
>+		ssize_t sent;
>+
>+		sent = write(client_fd, data, buf_size_bytes);
>+
>+		if (sent <= 0) {
>+			perror("write");
>+			exit(EXIT_FAILURE);
>+		}
>+
>+		total_send += sent;
>+	}
>+
>+	fprintf(stderr, "tx performance: %f Gb/s\n",
>+			get_gbps(total_send, current_nsec() - tx_begin_ns));

checkpatch suggests to align get_gbps with the open parenthesis.

>+
>+	close(client_fd);
>+	close(fd);
>+
>+	free(data);
>+}
>+
>+static void run_receiver(int peer_cid, unsigned long rcvlowat_bytes)
>+{
>+	unsigned int read_cnt;
>+	time_t rx_begin_ns;
>+	time_t in_read_ns;
>+	size_t total_recv;
>+	void *data;
>+	int fd;
>+
>+	fprintf(stderr, "Run as receiver\n");
>+	fprintf(stderr, "Connect to %i:%u\n", peer_cid, port);
>+	fprintf(stderr, "RX buffer %lu bytes\n", buf_size_bytes);
>+	fprintf(stderr, "Peer buffer %lu bytes\n", vsock_buf_bytes);
>+	fprintf(stderr, "SO_RCVLOWAT %lu bytes\n", rcvlowat_bytes);
>+
>+	fd = vsock_connect(peer_cid, port);
>+
>+	if (fd < 0) {
>+		perror("socket");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT,
>+		       &rcvlowat_bytes,
>+		       sizeof(rcvlowat_bytes))) {
>+		perror("setsockopt");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	data = mmap(NULL, buf_size_bytes, PROT_READ | PROT_WRITE,
>+		    MAP_ANONYMOUS | MAP_PRIVATE | MAP_POPULATE, -1, 0);
>+
>+	if (data == MAP_FAILED) {
>+		perror("mmap");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	read_cnt = 0;
>+	in_read_ns = 0;
>+	total_recv = 0;
>+	rx_begin_ns = current_nsec();
>+
>+	while (1) {
>+		struct pollfd fds = { 0 };
>+
>+		fds.fd = fd;
>+		fds.events = POLLIN | POLLERR | POLLHUP |
>+			     POLLRDHUP | POLLNVAL;
>+
>+		if (poll(&fds, 1, -1) < 0) {
>+			perror("poll");
>+			exit(EXIT_FAILURE);
>+		}
>+
>+		if (fds.revents & POLLERR) {
>+			fprintf(stderr, "'poll()' error\n");
>+			exit(EXIT_FAILURE);
>+		}
>+
>+		if (fds.revents & POLLIN) {
>+			ssize_t bytes_read;
>+			time_t t;
>+
>+			t = current_nsec();
>+			bytes_read = read(fd, data, buf_size_bytes);
>+			in_read_ns += (current_nsec() - t);
>+			read_cnt++;
>+
>+			if (!bytes_read)
>+				break;
>+
>+			if (bytes_read < 0) {
>+				perror("recv");
>+				exit(EXIT_FAILURE);
>+			}
>+
>+			total_recv += bytes_read;
>+		}
>+
>+		if (fds.revents & (POLLHUP | POLLRDHUP))
>+			break;
>+	}
>+
>+	fprintf(stderr, "rx performance %f Gb/s\n",
>+			get_gbps(total_recv, current_nsec() - rx_begin_ns));

checkpatch suggests to align get_gbps with the open parenthesis.

>+	fprintf(stderr, "total in 'read()' %f sec\n", (float)in_read_ns / NSEC_PER_SEC);
>+	fprintf(stderr, "POLLIN wakeups: %i\n", read_cnt);
>+	fprintf(stderr, "average in 'read()' %f ns\n", (float)in_read_ns / read_cnt);
>+
>+	munmap(data, buf_size_bytes);
>+	close(fd);
>+}
>+
>+static void usage(void)
>+{
>+	fprintf(stderr, "Help:\n"
>+			"\n"
>+			"This is benchmarking utility, to test vsock performance.\n"
>+			"It runs in two modes: sender or receiver. In sender mode, it waits\n"
>+			"connection from receiver, and when established, sender starts data\n"



>+			"transmission. Total size of data to send is set by '-m' option.\n"
>+			"\n"
>+			"Meaning of '-b' depends of sender or receiver mode. In sender\n"
>+			"mode, it is size of buffer, passed to 'write()'. In receiver mode,\n"
>+			"it is size of rx buffer passed to 'read()'.\n"

This part is better to put near -b description.

>+			"\n"
>+			"Options:\n"
>+			"  -h				This help message\n"
>+			"  -s				Sender mode(receiver default)\n"
>+			"  -p <port>			Port\n"
>+			"  -c <cid>			CID of the peer\n"
>+			"  -m <bytes to send>		Megabytes to send\n"
>+			"  -b <buffer size>		Depends on sender/receiver mode\n"
>+			"  -v <peer buffer size>	Peer buffer size\n"
>+			"  -r <SO_RCVLOWAT>		SO_RCVLOWAT\n"

Can you print also the default values?
(e.g. "-p <port>  Port (%d)\n" ..., DEFAULT_PORT)

>+			"\n");
>+	exit(EXIT_FAILURE);
>+}
>+
>+int main(int argc, char **argv)
>+{
>+	unsigned long to_send_bytes = DEFAULT_TO_SEND_BYTES;
>+	unsigned long rcvlowat_bytes = DEFAULT_RCVLOWAT_BYTES;
>+	bool receiver_mode = true;
>+	int peer_cid = -1;
>+	int c;
>+
>+	while ((c = getopt(argc, argv, "v:r:c:p:m:b:sh")) != -1) {
>+		switch (c) {
>+		case 'v': /* Peer buffer size. */
>+			vsock_buf_bytes = memparse(optarg);
>+			break;
>+		case 'r': /* SO_RCVLOWAT value. */
>+			rcvlowat_bytes = memparse(optarg);
>+			break;
>+		case 'c': /* CID to connect to. */
>+			peer_cid = atoi(optarg);

Maybe better to use strtol() to check errors.

>+			break;
>+		case 'p': /* Port to connect to. */
>+			port = atoi(optarg);
>+			break;
>+		case 'm': /* Bytes to send. */
>+			to_send_bytes = memparse(optarg);
>+			break;
>+		case 'b': /* Size of rx/tx buffer. */
>+			buf_size_bytes = memparse(optarg);
>+			break;
>+		case 's': /* Sender mode. */
>+			receiver_mode = false;
>+			break;
>+		case 'h': /* Help. */
>+			usage();
>+			break;
>+		default:
>+			usage();
>+

checkpatch: Blank lines aren't necessary before a close brace '}

>+		}
>+	}
>+
>+	if (receiver_mode)
>+		run_receiver(peer_cid, rcvlowat_bytes);
>+	else
>+		run_sender(to_send_bytes);
>+
>+	return 0;
>+}
>-- 
>2.25.1
  

On 21.11.2022 18:28, Stefano Garzarella wrote:
> On Tue, Nov 15, 2022 at 08:54:05PM +0000, Arseniy Krasnov wrote:
>> This adds utility to check vsock receive performance.
> 
> A small example on how to use it here in the commit message would be nice.
> 
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>> ---
>> tools/testing/vsock/Makefile     |   1 +
> 
> Please, can you also update tools/testing/vsock/README ?
> 
>> tools/testing/vsock/vsock_perf.c | 386 +++++++++++++++++++++++++++++++
>> 2 files changed, 387 insertions(+)
>> create mode 100644 tools/testing/vsock/vsock_perf.c
>>
>> diff --git a/tools/testing/vsock/Makefile b/tools/testing/vsock/Makefile
>> index f8293c6910c9..d36fdd59fe2e 100644
>> --- a/tools/testing/vsock/Makefile
>> +++ b/tools/testing/vsock/Makefile
>> @@ -3,6 +3,7 @@ all: test
>> test: vsock_test vsock_diag_test
>> vsock_test: vsock_test.o timeout.o control.o util.o
>> vsock_diag_test: vsock_diag_test.o timeout.o control.o util.o
>> +vsock_perf: vsock_perf.o
>>
>> CFLAGS += -g -O2 -Werror -Wall -I. -I../../include -I../../../usr/include -Wno-pointer-sign -fno-strict-overflow -fno-strict-aliasing -fno-common -MMD -U_FORTIFY_SOURCE -D_GNU_SOURCE
>> .PHONY: all test clean
>> diff --git a/tools/testing/vsock/vsock_perf.c b/tools/testing/vsock/vsock_perf.c
>> new file mode 100644
>> index 000000000000..ca7af08dca46
>> --- /dev/null
>> +++ b/tools/testing/vsock/vsock_perf.c
>> @@ -0,0 +1,386 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * vsock_perf - benchmark utility for vsock.
>> + *
>> + * Copyright (C) 2022 SberDevices.
>> + *
>> + * Author: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>> + */
>> +#include <getopt.h>
>> +#include <stdio.h>
>> +#include <stdlib.h>
>> +#include <stdbool.h>
>> +#include <string.h>
>> +#include <errno.h>
>> +#include <unistd.h>
>> +#include <time.h>
>> +#include <sys/mman.h>
>> +#include <stdint.h>
>> +#include <poll.h>
>> +#include <sys/socket.h>
>> +#include <linux/vm_sockets.h>
>> +
>> +#define DEFAULT_BUF_SIZE_BYTES    (128*1024)
>> +#define DEFAULT_TO_SEND_BYTES    (64*1024)
>> +#define DEFAULT_VSOCK_BUF_BYTES (256*1024)
> 
> checkpatch suggests to put spaces around '*' (e.g. 128 * 1024)
> 
>> +#define DEFAULT_RCVLOWAT_BYTES    1
>> +#define DEFAULT_PORT        1234
>> +
>> +#define BYTES_PER_GB        (1024 * 1024 * 1024ULL)
>> +#define NSEC_PER_SEC        (1000000000ULL)
>> +
>> +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 inline time_t current_nsec(void)
>> +{
>> +    struct timespec ts;
>> +
>> +    if (clock_gettime(CLOCK_REALTIME, &ts)) {
>> +        perror("clock_gettime");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    return (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
>> +}
>> +
>> +/* From lib/cmdline.c. */
>> +static unsigned long memparse(const char *ptr)
>> +{
>> +    char *endptr;
>> +
>> +    unsigned long long ret = strtoull(ptr, &endptr, 0);
>> +
>> +    switch (*endptr) {
>> +    case 'E':
>> +    case 'e':
>> +        ret <<= 10;
>> +    case 'P':
>> +    case 'p':
>> +        ret <<= 10;
>> +    case 'T':
>> +    case 't':
>> +        ret <<= 10;
>> +    case 'G':
>> +    case 'g':
>> +        ret <<= 10;
>> +    case 'M':
>> +    case 'm':
>> +        ret <<= 10;
>> +    case 'K':
>> +    case 'k':
>> +        ret <<= 10;
>> +        endptr++;
>> +    default:
>> +        break;
>> +    }
>> +
>> +    return ret;
>> +}
>> +
>> +static void vsock_increase_buf_size(int fd)
>> +{
>> +    if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_MAX_SIZE,
>> +               &vsock_buf_bytes, sizeof(vsock_buf_bytes))) {
>> +        perror("setsockopt");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    if (setsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE,
>> +               &vsock_buf_bytes, sizeof(vsock_buf_bytes))) {
>> +        perror("setsockopt");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +}
>> +
>> +static int vsock_connect(unsigned int cid, unsigned int port)
>> +{
>> +    union {
>> +        struct sockaddr sa;
>> +        struct sockaddr_vm svm;
>> +    } addr = {
>> +        .svm = {
>> +            .svm_family = AF_VSOCK,
>> +            .svm_port = port,
>> +            .svm_cid = cid,
>> +        },
>> +    };
>> +    int fd;
>> +
>> +    fd = socket(AF_VSOCK, SOCK_STREAM, 0);
>> +
>> +    if (fd < 0)
>> +        return -1;
>> +
>> +    vsock_increase_buf_size(fd);
>> +
>> +    if (connect(fd, &addr.sa, sizeof(addr.svm)) < 0) {
>> +        close(fd);
>> +        return -1;
>> +    }
>> +
>> +    return fd;
>> +}
>> +
>> +static float get_gbps(unsigned long bytes, time_t ns_delta)
>> +{
>> +    return ((float)bytes / BYTES_PER_GB) /
>> +           ((float)ns_delta / NSEC_PER_SEC);
>> +}
>> +
>> +static void run_sender(unsigned long to_send_bytes)
>> +{
>> +    time_t tx_begin_ns;
>> +    size_t total_send;
>> +    int client_fd;
>> +    char *data;
>> +    int fd;
>> +    union {
>> +        struct sockaddr sa;
>> +        struct sockaddr_vm svm;
>> +    } addr = {
>> +        .svm = {
>> +            .svm_family = AF_VSOCK,
>> +            .svm_port = port,
>> +            .svm_cid = VMADDR_CID_ANY,
>> +        },
>> +    };
>> +    union {
>> +        struct sockaddr sa;
>> +        struct sockaddr_vm svm;
>> +    } clientaddr;
>> +
>> +    socklen_t clientaddr_len = sizeof(clientaddr.svm);
>> +
>> +    fprintf(stderr, "Run as sender\n");
>> +    fprintf(stderr, "Listen port %u\n", port);
>> +    fprintf(stderr, "Send %lu bytes\n", to_send_bytes);
>> +    fprintf(stderr, "TX buffer %lu bytes\n", buf_size_bytes);
>> +    fprintf(stderr, "Peer buffer %lu bytes\n", vsock_buf_bytes);
> 
> Why using stderr for this prints?
> 
> Also in other places, I think we can use stdout for this kind on prints.
> 
>> +
>> +    fd = socket(AF_VSOCK, SOCK_STREAM, 0);
>> +
>> +    if (fd < 0) {
>> +        perror("socket");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    if (bind(fd, &addr.sa, sizeof(addr.svm)) < 0) {
>> +        perror("bind");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    if (listen(fd, 1) < 0) {
>> +        perror("listen");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    client_fd = accept(fd, &clientaddr.sa, &clientaddr_len);
>> +
>> +    if (client_fd < 0) {
>> +        perror("accept");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    vsock_increase_buf_size(client_fd);
>> +
>> +    data = malloc(buf_size_bytes);
>> +
>> +    if (!data) {
>> +        fprintf(stderr, "malloc failed\n");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    memset(data, 0, buf_size_bytes);
>> +    total_send = 0;
>> +    tx_begin_ns = current_nsec();
>> +
>> +    while (total_send < to_send_bytes) {
>> +        ssize_t sent;
>> +
>> +        sent = write(client_fd, data, buf_size_bytes);
>> +
>> +        if (sent <= 0) {
>> +            perror("write");
>> +            exit(EXIT_FAILURE);
>> +        }
>> +
>> +        total_send += sent;
>> +    }
>> +
>> +    fprintf(stderr, "tx performance: %f Gb/s\n",
>> +            get_gbps(total_send, current_nsec() - tx_begin_ns));
> 
> checkpatch suggests to align get_gbps with the open parenthesis.
> 
>> +
>> +    close(client_fd);
>> +    close(fd);
>> +
>> +    free(data);
>> +}
>> +
>> +static void run_receiver(int peer_cid, unsigned long rcvlowat_bytes)
>> +{
>> +    unsigned int read_cnt;
>> +    time_t rx_begin_ns;
>> +    time_t in_read_ns;
>> +    size_t total_recv;
>> +    void *data;
>> +    int fd;
>> +
>> +    fprintf(stderr, "Run as receiver\n");
>> +    fprintf(stderr, "Connect to %i:%u\n", peer_cid, port);
>> +    fprintf(stderr, "RX buffer %lu bytes\n", buf_size_bytes);
>> +    fprintf(stderr, "Peer buffer %lu bytes\n", vsock_buf_bytes);
>> +    fprintf(stderr, "SO_RCVLOWAT %lu bytes\n", rcvlowat_bytes);
>> +
>> +    fd = vsock_connect(peer_cid, port);
>> +
>> +    if (fd < 0) {
>> +        perror("socket");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    if (setsockopt(fd, SOL_SOCKET, SO_RCVLOWAT,
>> +               &rcvlowat_bytes,
>> +               sizeof(rcvlowat_bytes))) {
>> +        perror("setsockopt");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    data = mmap(NULL, buf_size_bytes, PROT_READ | PROT_WRITE,
>> +            MAP_ANONYMOUS | MAP_PRIVATE | MAP_POPULATE, -1, 0);
>> +
>> +    if (data == MAP_FAILED) {
>> +        perror("mmap");
>> +        exit(EXIT_FAILURE);
>> +    }
>> +
>> +    read_cnt = 0;
>> +    in_read_ns = 0;
>> +    total_recv = 0;
>> +    rx_begin_ns = current_nsec();
>> +
>> +    while (1) {
>> +        struct pollfd fds = { 0 };
>> +
>> +        fds.fd = fd;
>> +        fds.events = POLLIN | POLLERR | POLLHUP |
>> +                 POLLRDHUP | POLLNVAL;
>> +
>> +        if (poll(&fds, 1, -1) < 0) {
>> +            perror("poll");
>> +            exit(EXIT_FAILURE);
>> +        }
>> +
>> +        if (fds.revents & POLLERR) {
>> +            fprintf(stderr, "'poll()' error\n");
>> +            exit(EXIT_FAILURE);
>> +        }
>> +
>> +        if (fds.revents & POLLIN) {
>> +            ssize_t bytes_read;
>> +            time_t t;
>> +
>> +            t = current_nsec();
>> +            bytes_read = read(fd, data, buf_size_bytes);
>> +            in_read_ns += (current_nsec() - t);
>> +            read_cnt++;
>> +
>> +            if (!bytes_read)
>> +                break;
>> +
>> +            if (bytes_read < 0) {
>> +                perror("recv");
>> +                exit(EXIT_FAILURE);
>> +            }
>> +
>> +            total_recv += bytes_read;
>> +        }
>> +
>> +        if (fds.revents & (POLLHUP | POLLRDHUP))
>> +            break;
>> +    }
>> +
>> +    fprintf(stderr, "rx performance %f Gb/s\n",
>> +            get_gbps(total_recv, current_nsec() - rx_begin_ns));
> 
> checkpatch suggests to align get_gbps with the open parenthesis.
> 
>> +    fprintf(stderr, "total in 'read()' %f sec\n", (float)in_read_ns / NSEC_PER_SEC);
>> +    fprintf(stderr, "POLLIN wakeups: %i\n", read_cnt);
>> +    fprintf(stderr, "average in 'read()' %f ns\n", (float)in_read_ns / read_cnt);
>> +
>> +    munmap(data, buf_size_bytes);
>> +    close(fd);
>> +}
>> +
>> +static void usage(void)
>> +{
>> +    fprintf(stderr, "Help:\n"
>> +            "\n"
>> +            "This is benchmarking utility, to test vsock performance.\n"
>> +            "It runs in two modes: sender or receiver. In sender mode, it waits\n"
>> +            "connection from receiver, and when established, sender starts data\n"
> 
> 
> 
>> +            "transmission. Total size of data to send is set by '-m' option.\n"
>> +            "\n"
>> +            "Meaning of '-b' depends of sender or receiver mode. In sender\n"
>> +            "mode, it is size of buffer, passed to 'write()'. In receiver mode,\n"
>> +            "it is size of rx buffer passed to 'read()'.\n"
> 
> This part is better to put near -b description.
> 
>> +            "\n"
>> +            "Options:\n"
>> +            "  -h                This help message\n"
>> +            "  -s                Sender mode(receiver default)\n"
>> +            "  -p <port>            Port\n"
>> +            "  -c <cid>            CID of the peer\n"
>> +            "  -m <bytes to send>        Megabytes to send\n"
>> +            "  -b <buffer size>        Depends on sender/receiver mode\n"
>> +            "  -v <peer buffer size>    Peer buffer size\n"
>> +            "  -r <SO_RCVLOWAT>        SO_RCVLOWAT\n"
> 
> Can you print also the default values?
> (e.g. "-p <port>  Port (%d)\n" ..., DEFAULT_PORT)
> 
>> +            "\n");
>> +    exit(EXIT_FAILURE);
>> +}
>> +
>> +int main(int argc, char **argv)
>> +{
>> +    unsigned long to_send_bytes = DEFAULT_TO_SEND_BYTES;
>> +    unsigned long rcvlowat_bytes = DEFAULT_RCVLOWAT_BYTES;
>> +    bool receiver_mode = true;
>> +    int peer_cid = -1;
>> +    int c;
>> +
>> +    while ((c = getopt(argc, argv, "v:r:c:p:m:b:sh")) != -1) {
>> +        switch (c) {
>> +        case 'v': /* Peer buffer size. */
>> +            vsock_buf_bytes = memparse(optarg);
>> +            break;
>> +        case 'r': /* SO_RCVLOWAT value. */
>> +            rcvlowat_bytes = memparse(optarg);
>> +            break;
>> +        case 'c': /* CID to connect to. */
>> +            peer_cid = atoi(optarg);
> 
> Maybe better to use strtol() to check errors.
> 
>> +            break;
>> +        case 'p': /* Port to connect to. */
>> +            port = atoi(optarg);
>> +            break;
>> +        case 'm': /* Bytes to send. */
>> +            to_send_bytes = memparse(optarg);
>> +            break;
>> +        case 'b': /* Size of rx/tx buffer. */
>> +            buf_size_bytes = memparse(optarg);
>> +            break;
>> +        case 's': /* Sender mode. */
>> +            receiver_mode = false;
>> +            break;
>> +        case 'h': /* Help. */
>> +            usage();
>> +            break;
>> +        default:
>> +            usage();
>> +
> 
> checkpatch: Blank lines aren't necessary before a close brace '}
Ack this and all comments above
> 
>> +        }
>> +    }
>> +
>> +    if (receiver_mode)
>> +        run_receiver(peer_cid, rcvlowat_bytes);
>> +    else
>> +        run_sender(to_send_bytes);
>> +
>> +    return 0;
>> +}
>> -- 
>> 2.25.1
>