Add a microbenchmark for tun write performance.
Change-Id: Id73888d25afd9253634356436c57afec630a0846
diff --git a/clatd_microbenchmark.c b/clatd_microbenchmark.c
new file mode 100644
index 0000000..fed3100
--- /dev/null
+++ b/clatd_microbenchmark.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * clatd_microbenchmark.c - micro-benchmark for clatd tun send path
+ *
+ * Run with:
+ *
+ * adb push {$ANDROID_PRODUCT_OUT,}/data/nativetest/clatd_microbenchmark/clatd_microbenchmark
+ * adb shell /data/nativetest/clatd_microbenchmark/clatd_microbenchmark
+ *
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
+#include <netinet/udp.h>
+#include <arpa/inet.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
+#include "checksum.h"
+#include "tun.h"
+
+#define DEVICENAME "clat4"
+
+#define PORT 51339
+#define PAYLOADSIZE (1280 - sizeof(struct iphdr) - sizeof(struct udphdr))
+#define NUMPACKETS 1000000
+#define SEC_TO_NANOSEC (1000 * 1000 * 1000)
+
+void init_sockaddr_in(struct sockaddr_in *sin, const char *addr) {
+ sin->sin_family = AF_INET;
+ sin->sin_port = 0;
+ sin->sin_addr.s_addr = inet_addr(addr);
+}
+
+void die(const char *str) {
+ perror(str);
+ exit(1);
+}
+
+int setup_tun() {
+ int fd = tun_open();
+ if (fd == -1) die("tun_open");
+
+ char dev[IFNAMSIZ] = DEVICENAME;
+ int ret = tun_alloc(dev, fd);
+ if (ret == -1) die("tun_alloc");
+ struct ifreq ifr = {
+ .ifr_name = DEVICENAME,
+ };
+
+ int s = socket(AF_INET, SOCK_DGRAM, 0);
+ init_sockaddr_in((struct sockaddr_in *) &ifr.ifr_addr, "192.0.0.4");
+ if (ioctl(s, SIOCSIFADDR, &ifr) < 0) die("SIOCSIFADDR");
+ init_sockaddr_in((struct sockaddr_in *) &ifr.ifr_addr, "255.255.255.248");
+ if (ioctl(s, SIOCSIFNETMASK, &ifr) < 0) die("SIOCSIFNETMASK");
+ if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) die("SIOCGIFFLAGS");
+ ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
+ if (ioctl(s, SIOCSIFFLAGS, &ifr) < 0) die("SIOCSIFFLAGS");
+ return fd;
+}
+
+int send_packet(int fd, uint8_t payload[], int len, uint32_t payload_checksum) {
+ struct tun_pi tun = { 0, htons(ETH_P_IP) };
+ struct udphdr udp = {
+ .source = htons(1234),
+ .dest = htons(PORT),
+ .len = htons(len + sizeof(udp)),
+ .check = 0,
+ };
+ struct iphdr ip = {
+ .version = 4,
+ .ihl = 5,
+ .tot_len = htons(len + sizeof(ip) + sizeof(udp)),
+ .frag_off = htons(IP_DF),
+ .ttl = 55,
+ .protocol = IPPROTO_UDP,
+ .saddr = htonl(0xc0000006), // 192.0.0.6
+ .daddr = htonl(0xc0000004), // 192.0.0.4
+ };
+ clat_packet out = {
+ { &tun, sizeof(tun) }, // tun header
+ { &ip, sizeof(ip) }, // IP header
+ { NULL, 0 }, // Fragment header
+ { &udp, sizeof(udp) }, // Transport header
+ { NULL, 0 }, // ICMP error IP header
+ { NULL, 0 }, // ICMP error fragment header
+ { NULL, 0 }, // ICMP error transport header
+ { payload, len }, // Payload
+ };
+
+ ip.check = ip_checksum(&ip, sizeof(ip));
+
+ uint32_t sum;
+ sum = ipv4_pseudo_header_checksum(&ip, ntohs(udp.len));
+ sum = ip_checksum_add(sum, &udp, sizeof(udp));
+ sum += payload_checksum;
+ udp.check = ip_checksum_finish(sum);
+
+ return send_tun(fd, out, sizeof(out) / sizeof(out[0]));
+}
+
+double timedelta(const struct timespec tv1, const struct timespec tv2) {
+ struct timespec end = tv2;
+ if (end.tv_nsec < tv1.tv_nsec) {
+ end.tv_sec -= 1;
+ end.tv_nsec += SEC_TO_NANOSEC;
+ }
+ double seconds = (end.tv_sec - tv1.tv_sec);
+ seconds += (((double) (end.tv_nsec - tv1.tv_nsec)) / SEC_TO_NANOSEC);
+ return seconds;
+}
+
+void benchmark(const char *name, int fd, int s, int num, int do_read,
+ uint8_t payload[], int len, uint32_t payload_sum) {
+ int i;
+ char buf[4096];
+ struct timespec tv1, tv2;
+ int write_err = 0, read_err = 0;
+ clock_gettime(CLOCK_MONOTONIC, &tv1);
+ for (i = 0; i < num; i++) {
+ if (send_packet(fd, payload, len, payload_sum) == -1) write_err++;
+ if (do_read && recvfrom(s, buf, sizeof(buf), 0, NULL, NULL) == -1) {
+ read_err++;
+ if (errno == ETIMEDOUT) {
+ printf("Timed out after %d packets!\n", i);
+ break;
+ }
+ }
+ }
+ clock_gettime(CLOCK_MONOTONIC, &tv2);
+ double seconds = timedelta(tv1, tv2);
+ int pps = (int) (i / seconds);
+ double mbps = (i * PAYLOADSIZE / 1000000 * 8 / seconds);
+ printf("%s: %d packets in %.2fs (%d pps, %.2f Mbps), ", name, i, seconds, pps, mbps);
+ printf("read err %d (%.2f%%), write err %d (%.2f%%)\n",
+ read_err, (float) read_err / i * 100,
+ write_err, (float) write_err / i * 100);
+}
+
+int open_socket() {
+ int sock = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
+
+ int on = 1;
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) die("SO_REUSEADDR");
+
+ struct timeval tv = { 1, 0 };
+ if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1) die("SO_RCVTIMEO");
+
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = ntohs(PORT),
+ .sin_addr = { INADDR_ANY }
+ };
+ if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) == -1) die ("bind");
+
+ return sock;
+}
+
+int main() {
+ int fd = setup_tun();
+ int sock = open_socket();
+
+ int i;
+ uint8_t payload[PAYLOADSIZE];
+ for (i = 0; i < (int) sizeof(payload); i++) {
+ payload[i] = (uint8_t) i;
+ }
+ uint32_t payload_sum = ip_checksum_add(0, payload, sizeof(payload));
+
+ // Check things are working.
+ char buf[4096];
+ if (send_packet(fd, payload, sizeof(payload), payload_sum) == -1) die("send_packet");
+ if (recvfrom(sock, buf, sizeof(buf), 0, NULL, NULL) == -1) die("recvfrom");
+
+ benchmark("Blocking", fd, sock, NUMPACKETS, 1, payload, sizeof(payload), payload_sum);
+ close(fd);
+
+ fd = setup_tun();
+ set_nonblocking(fd);
+ benchmark("No read", fd, sock, NUMPACKETS, 0, payload, sizeof(payload), payload_sum);
+ close(fd);
+
+ fd = setup_tun();
+ set_nonblocking(fd);
+ benchmark("Nonblocking", fd, sock, NUMPACKETS, 1, payload, sizeof(payload), payload_sum);
+ close(fd);
+
+ return 0;
+}