diff options
Diffstat (limited to 'clatd_microbenchmark.c')
| -rw-r--r-- | clatd_microbenchmark.c | 214 |
1 files changed, 214 insertions, 0 deletions
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; +} |