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>
25 #define SO_BUSY_POLL 46
28 #define FRAME_SIZE 256
29 #define BLOCK_SIZE 4096
31 #define FRAME_NR (BLOCK_NR*(BLOCK_SIZE/FRAME_SIZE))
33 #define STRINGIFY(val) #val
34 #define TOSTRING(val) STRINGIFY(val)
35 #define CHECK(cmd) ({ int ret = (cmd); if (ret == -1) { perror(#cmd " line " TOSTRING(__LINE__)); exit(1); }; ret; })
36 #define CHECKPTR(cmd) ({ void *ptr = (cmd); if (ptr == (void*)-1) { perror(#cmd " line " TOSTRING(__LINE__)); exit(1); }; ptr; })
39 char *devout = "can1";
40 enum { IN_READ, IN_RECVMMSG, IN_MMAP, IN_MMAPBUSY } in_method = IN_READ;
41 enum { WRITE, OUT_MMAP } out_method = WRITE;
51 #define VERBOSE(format, ...) do { if (!quiet) fprintf(stderr, format, ##__VA_ARGS__); } while (0)
58 enum in2out (*in_fn)(struct in_ctx *ctx, struct can_frame *cf);
67 int (*out_fn)(struct out_ctx *ctx, struct can_frame *cf);
70 enum in2out in_read(struct in_ctx *ctx, struct can_frame *cf)
72 int ret = read(ctx->s, cf, sizeof(*cf));
73 if (ret != sizeof(*cf)) {
80 void init_read(struct in_ctx *ctx)
83 struct sockaddr_can addr;
86 s = CHECK(socket(PF_CAN, SOCK_RAW, CAN_RAW));
89 CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
90 &busy_poll_us, sizeof(busy_poll_us)));
93 strncpy(ifr.ifr_name, devin, sizeof(ifr.ifr_name));
94 if (-1 == ioctl(s, SIOCGIFINDEX, &ifr)) {
99 addr.can_family = AF_CAN;
100 addr.can_ifindex = ifr.ifr_ifindex;
102 CHECK(bind(s, (struct sockaddr *)&addr, sizeof(addr)));
105 ctx->in_fn = in_read;
108 enum in2out in_packet_rx(struct in_ctx *ctx, struct can_frame *cf)
110 volatile struct tpacket2_hdr *hdr = ctx->ptr + ctx->current*FRAME_SIZE;
113 while (hdr->tp_status == TP_STATUS_KERNEL) {
114 if (in_method != IN_MMAPBUSY) {
115 struct pollfd pfd = {.fd = ctx->s, .revents = 0,
116 .events = POLLIN|POLLRDNORM|POLLERR };
117 ret = CHECK(poll(&pfd, 1, -1));
120 //struct sockaddr_ll *addr = (void*)hdr + TPACKET_ALIGN(ctx->hdrlen);
122 struct can_frame *cf_mmap = (void*)hdr + hdr->tp_mac;
123 //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);
126 ctx->current = (ctx->current + 1) % FRAME_NR;
127 hdr = ctx->ptr + ctx->current*FRAME_SIZE;
128 return (hdr->tp_status == TP_STATUS_KERNEL) ? SEND : STORE_ONLY;
132 void init_packet_rx(struct in_ctx *ctx)
135 struct sockaddr_ll my_addr;
138 s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
141 CHECK(setsockopt(s, SOL_SOCKET, SO_BUSY_POLL,
142 &busy_poll_us, sizeof(busy_poll_us)));
145 int val = TPACKET_V2;
146 CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
147 socklen_t len = sizeof(ctx->hdrlen);
148 CHECK(getsockopt(s, SOL_PACKET, PACKET_HDRLEN, &ctx->hdrlen, &len));
150 strncpy (ifr.ifr_name, devin, sizeof(ifr.ifr_name));
151 CHECK(ioctl(s, SIOCGIFINDEX, &ifr));
153 my_addr.sll_family = AF_PACKET;
154 my_addr.sll_protocol = htons(ETH_P_ALL);
155 my_addr.sll_ifindex = ifr.ifr_ifindex;
157 CHECK(bind(s, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)));
159 struct tpacket_req req = {
160 .tp_block_size = BLOCK_SIZE,
161 .tp_frame_size = FRAME_SIZE,
162 .tp_block_nr = BLOCK_NR,
163 .tp_frame_nr = FRAME_NR,
165 CHECK(setsockopt(s, SOL_PACKET, PACKET_RX_RING, (char *)&req, sizeof(req)));
167 ctx->ptr = (char*)CHECKPTR(mmap(0, BLOCK_SIZE*BLOCK_NR, PROT_READ|PROT_WRITE, MAP_SHARED, s, 0));
170 ctx->in_fn = in_packet_rx;
174 int out_write(struct out_ctx *ctx, struct can_frame *cf)
176 int ret = write(ctx->s, cf, sizeof(*cf));
177 if (ret != sizeof(*cf)) {
184 void init_write(struct out_ctx *ctx)
187 struct sockaddr_can addr;
190 s = CHECK(socket(PF_CAN, SOCK_RAW, CAN_RAW));
192 strncpy(ifr.ifr_name, devout, sizeof(ifr.ifr_name));
193 if (-1 == ioctl(s, SIOCGIFINDEX, &ifr)) {
198 addr.can_family = AF_CAN;
199 addr.can_ifindex = ifr.ifr_ifindex;
201 CHECK(bind(s, (struct sockaddr *)&addr, sizeof(addr)));
204 ctx->out_fn = out_write;
207 int out_packet_tx(struct out_ctx *ctx, struct can_frame *cf)
209 volatile struct tpacket2_hdr *hdr = ctx->ptr + ctx->current*FRAME_SIZE;
212 while (hdr->tp_status != TP_STATUS_AVAILABLE) {
213 struct pollfd pfd = {.fd = ctx->s, .revents = 0,
214 .events = POLLIN|POLLRDNORM|POLLERR };
215 ret = CHECK(poll(&pfd, 1, -1));
218 //struct sockaddr_ll *addr = (void*)hdr + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
219 struct can_frame *cf_mmap = (void*)hdr + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
221 hdr->tp_len = sizeof(*cf);
222 hdr->tp_status = TP_STATUS_SEND_REQUEST;
223 ctx->current = (ctx->current + 1) % FRAME_NR;
225 if (ctx->from_in == SEND){
226 ret = CHECK(send(ctx->s, NULL, 0, 0));
233 void init_packet_tx(struct out_ctx *ctx)
236 struct sockaddr_ll my_addr;
239 s = CHECK(socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)));
241 int val = TPACKET_V2;
242 CHECK(setsockopt(s, SOL_PACKET, PACKET_VERSION, &val, sizeof(val)));
243 socklen_t len = sizeof(ctx->hdrlen);
244 CHECK(getsockopt(s, SOL_PACKET, PACKET_HDRLEN, &ctx->hdrlen, &len));
246 strncpy (ifr.ifr_name, devout, sizeof(ifr.ifr_name));
247 CHECK(ioctl(s, SIOCGIFINDEX, &ifr));
249 my_addr.sll_family = AF_PACKET;
250 my_addr.sll_protocol = htons(ETH_P_CAN);
251 my_addr.sll_ifindex = ifr.ifr_ifindex;
253 CHECK(bind(s, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)));
255 struct tpacket_req req = {
256 .tp_block_size = BLOCK_SIZE,
257 .tp_frame_size = FRAME_SIZE,
258 .tp_block_nr = BLOCK_NR,
259 .tp_frame_nr = FRAME_NR,
261 CHECK(setsockopt(s, SOL_PACKET, PACKET_TX_RING, (char *)&req, sizeof(req)));
263 ctx->ptr = (char*)CHECKPTR(mmap(0, BLOCK_SIZE*BLOCK_NR, PROT_READ|PROT_WRITE, MAP_SHARED, s, 0));
266 ctx->out_fn = out_packet_tx;
270 void init_in(struct in_ctx *in)
272 memset(in, 0, sizeof(*in));
282 fprintf(stderr, "Unknown \"in method\" %d\n", in_method);
287 int in(struct in_ctx *ctx, struct can_frame *cf)
289 return ctx->in_fn(ctx, cf);
292 void init_out(struct out_ctx *out)
294 memset(out, 0, sizeof(*out));
295 switch (out_method) {
296 case WRITE: init_write(out); break;
297 case OUT_MMAP: init_packet_tx(out); break;
299 fprintf(stderr, "Unknown \"out method\" %d\n", out_method);
304 int out(struct out_ctx *ctx, struct can_frame *cf)
306 return ctx->out_fn(ctx, cf);
318 VERBOSE("UGW started\n");
321 oc.from_in = in(&ic, &cf);
327 int main(int argc, char *argv[])
331 while ((opt = getopt(argc, argv, "b:qr:t:")) != -1) {
334 busy_poll_us = atoi(optarg);
340 if (strcmp(optarg, "read") == 0)
342 else if (strcmp(optarg, "mmap") == 0)
344 else if (strcmp(optarg, "mmapbusy") == 0)
345 in_method = IN_MMAPBUSY;
347 fprintf(stderr, "Unsuported RX method: %s\n", optarg);
352 if (strcmp(optarg, "write") == 0)
354 else if (strcmp(optarg, "mmap") == 0)
355 out_method = OUT_MMAP;
357 fprintf(stderr, "Unsuported TX method: %s\n", optarg);
362 fprintf(stderr, "Usage: %s [in_interface out_interface]\n",
369 devin = argv[optind];
371 devout = argv[optind+1];