1 /**************************************************************************/
2 /* CAN user space gateway for performance benchmarks */
3 /* Copyright (C) 2013, 2014 Michal Sojka, DCE, FEE, CTU Prague */
5 /**************************************************************************/
8 #include <sys/socket.h>
10 #include <sys/ioctl.h>
18 #include <linux/if_ether.h>
19 #include <linux/if_packet.h>
22 #include <arpa/inet.h>
28 #define SO_BUSY_POLL 46
31 #define FRAME_SIZE 128
32 #define BLOCK_SIZE 4096
34 #define FRAME_NR (BLOCK_NR*(BLOCK_SIZE/FRAME_SIZE))
36 #define STRINGIFY(val) #val
37 #define TOSTRING(val) STRINGIFY(val)
38 #define CHECK(cmd) ({ int ret = (cmd); if (ret == -1) { perror(#cmd " line " TOSTRING(__LINE__)); exit(1); }; ret; })
39 #define CHECKPTR(cmd) ({ void *ptr = (cmd); if (ptr == (void*)-1) { perror(#cmd " line " TOSTRING(__LINE__)); exit(1); }; ptr; })
42 char *devout = "can1";
43 enum { IN_READ, IN_RECVMMSG, IN_MMAP, IN_MMAPBUSY } in_method = IN_READ;
44 enum { WRITE, OUT_MMAP } out_method = WRITE;
47 bool nonblocking = false;
56 #define VERBOSE(format, ...) do { if (!quiet) fprintf(stderr, format, ##__VA_ARGS__); } while (0)
63 enum in2out (*in_fn)(struct in_ctx *ctx, struct can_frame *cf);
72 int (*out_fn)(struct out_ctx *ctx, struct can_frame *cf);
82 printf("store:%d\nsend:%d\ntotal:%d\n",
83 stats.store, stats.send, stats.store + stats.send);
87 enum in2out in_read(struct in_ctx *ctx, struct can_frame *cf)
89 int ret = read(ctx->s, cf, sizeof(*cf));
90 if (nonblocking && ret == -1 && errno == EAGAIN)
92 if (ret != sizeof(*cf)) {
99 void init_read(struct in_ctx *ctx)
102 struct sockaddr_can addr;
105 s = CHECK(socket(PF_CAN, SOCK_RAW, CAN_RAW));
108 int flags = CHECK(fcntl(s, F_GETFL, 0));
109 CHECK(fcntl(s, F_SETFL, flags | O_NONBLOCK));
113 CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
114 &busy_poll_us, sizeof(busy_poll_us)));
117 strncpy(ifr.ifr_name, devin, sizeof(ifr.ifr_name));
118 if (-1 == ioctl(s, SIOCGIFINDEX, &ifr)) {
123 addr.can_family = AF_CAN;
124 addr.can_ifindex = ifr.ifr_ifindex;
126 CHECK(bind(s, (struct sockaddr *)&addr, sizeof(addr)));
129 ctx->in_fn = in_read;
132 enum in2out in_packet_rx(struct in_ctx *ctx, struct can_frame *cf)
134 volatile struct tpacket2_hdr *hdr = ctx->ptr + ctx->current*FRAME_SIZE;
137 while (hdr->tp_status == TP_STATUS_KERNEL) {
138 if (in_method != IN_MMAPBUSY) {
139 struct pollfd pfd = {.fd = ctx->s, .revents = 0,
140 .events = POLLIN|POLLRDNORM|POLLERR };
141 ret = CHECK(poll(&pfd, 1, -1));
144 //struct sockaddr_ll *addr = (void*)hdr + TPACKET_ALIGN(ctx->hdrlen);
146 struct can_frame *cf_mmap = (void*)hdr + hdr->tp_mac;
149 ctx->current = (ctx->current + 1) % FRAME_NR;
150 hdr = ctx->ptr + ctx->current*FRAME_SIZE;
151 return (hdr->tp_status == TP_STATUS_KERNEL) ? SEND : STORE_ONLY;
155 void init_packet_rx(struct in_ctx *ctx)
158 struct sockaddr_ll my_addr;
161 s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
164 CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
165 &busy_poll_us, sizeof(busy_poll_us)));
168 int val = TPACKET_V2;
169 CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
170 socklen_t len = sizeof(ctx->hdrlen);
171 CHECK(getsockopt(s, SOL_PACKET, PACKET_HDRLEN, &ctx->hdrlen, &len));
173 strncpy (ifr.ifr_name, devin, sizeof(ifr.ifr_name));
174 CHECK(ioctl(s, SIOCGIFINDEX, &ifr));
176 my_addr.sll_family = AF_PACKET;
177 my_addr.sll_protocol = htons(ETH_P_ALL);
178 my_addr.sll_ifindex = ifr.ifr_ifindex;
180 CHECK(bind(s, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)));
182 struct tpacket_req req = {
183 .tp_block_size = BLOCK_SIZE,
184 .tp_frame_size = FRAME_SIZE,
185 .tp_block_nr = BLOCK_NR,
186 .tp_frame_nr = FRAME_NR,
188 CHECK(setsockopt(s, SOL_PACKET, PACKET_RX_RING, (char *)&req, sizeof(req)));
190 ctx->ptr = (char*)CHECKPTR(mmap(0, BLOCK_SIZE*BLOCK_NR, PROT_READ|PROT_WRITE, MAP_SHARED, s, 0));
193 ctx->in_fn = in_packet_rx;
197 int out_write(struct out_ctx *ctx, struct can_frame *cf)
199 if (ctx->from_in == NOP)
202 int ret = write(ctx->s, cf, sizeof(*cf));
203 if (ret != sizeof(*cf)) {
210 void init_write(struct out_ctx *ctx)
213 struct sockaddr_can addr;
216 s = CHECK(socket(PF_CAN, SOCK_RAW, CAN_RAW));
218 strncpy(ifr.ifr_name, devout, sizeof(ifr.ifr_name));
219 if (-1 == ioctl(s, SIOCGIFINDEX, &ifr)) {
224 addr.can_family = AF_CAN;
225 addr.can_ifindex = ifr.ifr_ifindex;
227 CHECK(bind(s, (struct sockaddr *)&addr, sizeof(addr)));
230 ctx->out_fn = out_write;
233 int out_packet_tx(struct out_ctx *ctx, struct can_frame *cf)
235 volatile struct tpacket2_hdr *hdr = ctx->ptr + ctx->current*FRAME_SIZE;
238 if (ctx->from_in == NOP)
242 while (hdr->tp_status != TP_STATUS_AVAILABLE) {
243 struct pollfd pfd = {.fd = ctx->s, .revents = 0,
244 .events = POLLIN|POLLRDNORM|POLLERR };
245 ret = CHECK(poll(&pfd, 1, -1));
248 //struct sockaddr_ll *addr = (void*)hdr + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
249 struct can_frame *cf_mmap = (void*)hdr + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
251 hdr->tp_len = sizeof(*cf);
252 hdr->tp_status = TP_STATUS_SEND_REQUEST;
253 ctx->current = (ctx->current + 1) % FRAME_NR;
255 if (ctx->from_in == SEND){
256 ret = CHECK(send(ctx->s, NULL, 0, 0));
263 void init_packet_tx(struct out_ctx *ctx)
266 struct sockaddr_ll my_addr;
269 s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
271 int val = TPACKET_V2;
272 CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
273 socklen_t len = sizeof(ctx->hdrlen);
274 CHECK(getsockopt(s, SOL_PACKET, PACKET_HDRLEN, &ctx->hdrlen, &len));
276 strncpy (ifr.ifr_name, devout, sizeof(ifr.ifr_name));
277 CHECK(ioctl(s, SIOCGIFINDEX, &ifr));
279 my_addr.sll_family = AF_PACKET;
280 my_addr.sll_protocol = htons(ETH_P_CAN);
281 my_addr.sll_ifindex = ifr.ifr_ifindex;
283 CHECK(bind(s, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)));
285 struct tpacket_req req = {
286 .tp_block_size = BLOCK_SIZE,
287 .tp_frame_size = FRAME_SIZE,
288 .tp_block_nr = BLOCK_NR,
289 .tp_frame_nr = FRAME_NR,
291 CHECK(setsockopt(s, SOL_PACKET, PACKET_TX_RING, (char *)&req, sizeof(req)));
293 ctx->ptr = (char*)CHECKPTR(mmap(0, BLOCK_SIZE*BLOCK_NR, PROT_READ|PROT_WRITE, MAP_SHARED, s, 0));
296 ctx->out_fn = out_packet_tx;
300 void init_in(struct in_ctx *in)
302 memset(in, 0, sizeof(*in));
312 fprintf(stderr, "Unknown \"in method\" %d\n", in_method);
317 int in(struct in_ctx *ctx, struct can_frame *cf)
319 return ctx->in_fn(ctx, cf);
322 void init_out(struct out_ctx *out)
324 memset(out, 0, sizeof(*out));
325 switch (out_method) {
326 case WRITE: init_write(out); break;
327 case OUT_MMAP: init_packet_tx(out); break;
329 fprintf(stderr, "Unknown \"out method\" %d\n", out_method);
334 int out(struct out_ctx *ctx, struct can_frame *cf)
336 return ctx->out_fn(ctx, cf);
348 VERBOSE("UGW started\n");
351 oc.from_in = in(&ic, &cf);
352 switch (oc.from_in) {
353 case SEND: stats.send++; break;
354 case STORE_ONLY: stats.store++; break;
362 int main(int argc, char *argv[])
366 while ((opt = getopt(argc, argv, "b:nqr:t:")) != -1) {
369 busy_poll_us = atoi(optarg);
378 if (strcmp(optarg, "read") == 0)
380 else if (strcmp(optarg, "mmap") == 0)
382 else if (strcmp(optarg, "mmapbusy") == 0)
383 in_method = IN_MMAPBUSY;
385 fprintf(stderr, "Unsuported RX method: %s\n", optarg);
390 if (strcmp(optarg, "write") == 0)
392 else if (strcmp(optarg, "mmap") == 0)
393 out_method = OUT_MMAP;
395 fprintf(stderr, "Unsuported TX method: %s\n", optarg);
400 fprintf(stderr, "Usage: %s [in_interface out_interface]\n",
407 devin = argv[optind];
409 devout = argv[optind+1];
411 signal(SIGINT, sigint);