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>
27 #define SO_BUSY_POLL 46
30 #define FRAME_SIZE 256
31 #define BLOCK_SIZE 4096
33 #define FRAME_NR (BLOCK_NR*(BLOCK_SIZE/FRAME_SIZE))
35 #define STRINGIFY(val) #val
36 #define TOSTRING(val) STRINGIFY(val)
37 #define CHECK(cmd) ({ int ret = (cmd); if (ret == -1) { perror(#cmd " line " TOSTRING(__LINE__)); exit(1); }; ret; })
38 #define CHECKPTR(cmd) ({ void *ptr = (cmd); if (ptr == (void*)-1) { perror(#cmd " line " TOSTRING(__LINE__)); exit(1); }; ptr; })
41 char *devout = "can1";
42 enum { IN_READ, IN_RECVMMSG, IN_MMAP, IN_MMAPBUSY } in_method = IN_READ;
43 enum { WRITE, OUT_MMAP } out_method = WRITE;
46 bool nonblocking = false;
55 #define VERBOSE(format, ...) do { if (!quiet) fprintf(stderr, format, ##__VA_ARGS__); } while (0)
62 enum in2out (*in_fn)(struct in_ctx *ctx, struct can_frame *cf);
71 int (*out_fn)(struct out_ctx *ctx, struct can_frame *cf);
74 enum in2out in_read(struct in_ctx *ctx, struct can_frame *cf)
76 int ret = read(ctx->s, cf, sizeof(*cf));
77 if (nonblocking && ret == -1 && errno == EAGAIN)
79 if (ret != sizeof(*cf)) {
86 void init_read(struct in_ctx *ctx)
89 struct sockaddr_can addr;
92 s = CHECK(socket(PF_CAN, SOCK_RAW, CAN_RAW));
95 int flags = CHECK(fcntl(s, F_GETFL, 0));
96 CHECK(fcntl(s, F_SETFL, flags | O_NONBLOCK));
100 CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
101 &busy_poll_us, sizeof(busy_poll_us)));
104 strncpy(ifr.ifr_name, devin, sizeof(ifr.ifr_name));
105 if (-1 == ioctl(s, SIOCGIFINDEX, &ifr)) {
110 addr.can_family = AF_CAN;
111 addr.can_ifindex = ifr.ifr_ifindex;
113 CHECK(bind(s, (struct sockaddr *)&addr, sizeof(addr)));
116 ctx->in_fn = in_read;
119 enum in2out in_packet_rx(struct in_ctx *ctx, struct can_frame *cf)
121 volatile struct tpacket2_hdr *hdr = ctx->ptr + ctx->current*FRAME_SIZE;
124 while (hdr->tp_status == TP_STATUS_KERNEL) {
125 if (in_method != IN_MMAPBUSY) {
126 struct pollfd pfd = {.fd = ctx->s, .revents = 0,
127 .events = POLLIN|POLLRDNORM|POLLERR };
128 ret = CHECK(poll(&pfd, 1, -1));
131 //struct sockaddr_ll *addr = (void*)hdr + TPACKET_ALIGN(ctx->hdrlen);
133 struct can_frame *cf_mmap = (void*)hdr + hdr->tp_mac;
134 //printf("ret:%d st:%#08x m:%d RX in frame %2d, CAN ID %#3x\n", ret, hdr->tp_status, hdr->tp_mac, ctx->current, cf_mmap->can_id);
137 ctx->current = (ctx->current + 1) % FRAME_NR;
138 hdr = ctx->ptr + ctx->current*FRAME_SIZE;
139 return (hdr->tp_status == TP_STATUS_KERNEL) ? SEND : STORE_ONLY;
143 void init_packet_rx(struct in_ctx *ctx)
146 struct sockaddr_ll my_addr;
149 s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
152 CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
153 &busy_poll_us, sizeof(busy_poll_us)));
156 int val = TPACKET_V2;
157 CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
158 socklen_t len = sizeof(ctx->hdrlen);
159 CHECK(getsockopt(s, SOL_PACKET, PACKET_HDRLEN, &ctx->hdrlen, &len));
161 strncpy (ifr.ifr_name, devin, sizeof(ifr.ifr_name));
162 CHECK(ioctl(s, SIOCGIFINDEX, &ifr));
164 my_addr.sll_family = AF_PACKET;
165 my_addr.sll_protocol = htons(ETH_P_ALL);
166 my_addr.sll_ifindex = ifr.ifr_ifindex;
168 CHECK(bind(s, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)));
170 struct tpacket_req req = {
171 .tp_block_size = BLOCK_SIZE,
172 .tp_frame_size = FRAME_SIZE,
173 .tp_block_nr = BLOCK_NR,
174 .tp_frame_nr = FRAME_NR,
176 CHECK(setsockopt(s, SOL_PACKET, PACKET_RX_RING, (char *)&req, sizeof(req)));
178 ctx->ptr = (char*)CHECKPTR(mmap(0, BLOCK_SIZE*BLOCK_NR, PROT_READ|PROT_WRITE, MAP_SHARED, s, 0));
181 ctx->in_fn = in_packet_rx;
185 int out_write(struct out_ctx *ctx, struct can_frame *cf)
187 if (ctx->from_in == NOP)
190 int ret = write(ctx->s, cf, sizeof(*cf));
191 if (ret != sizeof(*cf)) {
198 void init_write(struct out_ctx *ctx)
201 struct sockaddr_can addr;
204 s = CHECK(socket(PF_CAN, SOCK_RAW, CAN_RAW));
206 strncpy(ifr.ifr_name, devout, sizeof(ifr.ifr_name));
207 if (-1 == ioctl(s, SIOCGIFINDEX, &ifr)) {
212 addr.can_family = AF_CAN;
213 addr.can_ifindex = ifr.ifr_ifindex;
215 CHECK(bind(s, (struct sockaddr *)&addr, sizeof(addr)));
218 ctx->out_fn = out_write;
221 int out_packet_tx(struct out_ctx *ctx, struct can_frame *cf)
223 volatile struct tpacket2_hdr *hdr = ctx->ptr + ctx->current*FRAME_SIZE;
226 if (ctx->from_in == NOP)
230 while (hdr->tp_status != TP_STATUS_AVAILABLE) {
231 struct pollfd pfd = {.fd = ctx->s, .revents = 0,
232 .events = POLLIN|POLLRDNORM|POLLERR };
233 ret = CHECK(poll(&pfd, 1, -1));
236 //struct sockaddr_ll *addr = (void*)hdr + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
237 struct can_frame *cf_mmap = (void*)hdr + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
239 hdr->tp_len = sizeof(*cf);
240 hdr->tp_status = TP_STATUS_SEND_REQUEST;
241 ctx->current = (ctx->current + 1) % FRAME_NR;
243 if (ctx->from_in == SEND){
244 ret = CHECK(send(ctx->s, NULL, 0, 0));
251 void init_packet_tx(struct out_ctx *ctx)
254 struct sockaddr_ll my_addr;
257 s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
259 int val = TPACKET_V2;
260 CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
261 socklen_t len = sizeof(ctx->hdrlen);
262 CHECK(getsockopt(s, SOL_PACKET, PACKET_HDRLEN, &ctx->hdrlen, &len));
264 strncpy (ifr.ifr_name, devout, sizeof(ifr.ifr_name));
265 CHECK(ioctl(s, SIOCGIFINDEX, &ifr));
267 my_addr.sll_family = AF_PACKET;
268 my_addr.sll_protocol = htons(ETH_P_CAN);
269 my_addr.sll_ifindex = ifr.ifr_ifindex;
271 CHECK(bind(s, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)));
273 struct tpacket_req req = {
274 .tp_block_size = BLOCK_SIZE,
275 .tp_frame_size = FRAME_SIZE,
276 .tp_block_nr = BLOCK_NR,
277 .tp_frame_nr = FRAME_NR,
279 CHECK(setsockopt(s, SOL_PACKET, PACKET_TX_RING, (char *)&req, sizeof(req)));
281 ctx->ptr = (char*)CHECKPTR(mmap(0, BLOCK_SIZE*BLOCK_NR, PROT_READ|PROT_WRITE, MAP_SHARED, s, 0));
284 ctx->out_fn = out_packet_tx;
288 void init_in(struct in_ctx *in)
290 memset(in, 0, sizeof(*in));
300 fprintf(stderr, "Unknown \"in method\" %d\n", in_method);
305 int in(struct in_ctx *ctx, struct can_frame *cf)
307 return ctx->in_fn(ctx, cf);
310 void init_out(struct out_ctx *out)
312 memset(out, 0, sizeof(*out));
313 switch (out_method) {
314 case WRITE: init_write(out); break;
315 case OUT_MMAP: init_packet_tx(out); break;
317 fprintf(stderr, "Unknown \"out method\" %d\n", out_method);
322 int out(struct out_ctx *ctx, struct can_frame *cf)
324 return ctx->out_fn(ctx, cf);
336 VERBOSE("UGW started\n");
339 oc.from_in = in(&ic, &cf);
340 switch (oc.from_in) {
341 case SEND: stats.send++; break;
342 case STORE_ONLY: stats.store++; break;
350 int main(int argc, char *argv[])
354 while ((opt = getopt(argc, argv, "b:nqr:t:")) != -1) {
357 busy_poll_us = atoi(optarg);
366 if (strcmp(optarg, "read") == 0)
368 else if (strcmp(optarg, "mmap") == 0)
370 else if (strcmp(optarg, "mmapbusy") == 0)
371 in_method = IN_MMAPBUSY;
373 fprintf(stderr, "Unsuported RX method: %s\n", optarg);
378 if (strcmp(optarg, "write") == 0)
380 else if (strcmp(optarg, "mmap") == 0)
381 out_method = OUT_MMAP;
383 fprintf(stderr, "Unsuported TX method: %s\n", optarg);
388 fprintf(stderr, "Usage: %s [in_interface out_interface]\n",
395 devin = argv[optind];
397 devout = argv[optind+1];