cangen.c

@@ -180,7 +180,7 @@ static void print_usage(char *prg)
 	fprintf(stderr, "         -X            (generate CAN XL CAN frames)\n");
 	fprintf(stderr, "         -R            (generate RTR frames)\n");
 	fprintf(stderr, "         -8            (allow DLC values greater then 8 for Classic CAN frames)\n");
-	fprintf(stderr, "         -m            (mix CC [-e -R] FD [-f -b -E] XL [-X] on capable devices)\n");
+	fprintf(stderr, "         -m            (mix -e -f -b -E -R -X frames)\n");
 	fprintf(stderr, "         -I <mode>     (CAN ID generation mode - see below)\n");
 	fprintf(stderr, "         -L <mode>     (CAN data length code (dlc) generation mode - see below)\n");
 	fprintf(stderr, "         -D <mode>     (CAN data (payload) generation mode - see below)\n");
@@ -339,9 +339,10 @@ resend:
 	nbytes = sendmsg(fd, &msg, 0);
 	if (nbytes < 0) {
 		ret = -errno;
-		if (ret != -ENOBUFS)
+		if (ret != -ENOBUFS) {
+			perror("write");
 			return ret;
-
+		}
 		if (!ignore_enobufs && !timeout) {
 			perror("write");
 			return ret;
@@ -454,9 +455,6 @@ int main(int argc, char **argv)
 	unsigned char extended = 0;
 	unsigned char canfd = 0;
 	unsigned char canxl = 0;
-	unsigned char mixcc = 1; /* mix default */
-	unsigned char mixfd = 1; /* mix default */
-	unsigned char mixxl = 1; /* mix default */
 	unsigned char brs = 0;
 	unsigned char esi = 0;
 	unsigned char mix = 0;
@@ -576,6 +574,7 @@ int main(int argc, char **argv)
 
 		case 'm':
 			mix = 1;
+			canfd = 1; /* to switch the socket into CAN FD mode */
 			view |= CANLIB_VIEW_INDENT_SFF;
 			break;
 
@@ -778,58 +777,14 @@ int main(int argc, char **argv)
 			   &loopback, sizeof(loopback));
 	}
 
-	/* get CAN netdevice MTU for frame type capabilities */
-	if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
-		perror("SIOCGIFMTU");
-		return 1;
-	}
-
-	/* check CAN XL support */
-	if (ifr.ifr_mtu < (int)CANXL_MIN_MTU) {
-		mixxl = 0;
-		if (canxl) {
-			printf("CAN interface not CAN XL capable - sorry.\n");
-			return 1;
-		}
-	}
-
-	/* check CAN FD support */
-	if (ifr.ifr_mtu < (int)CANFD_MTU) {
-		mixfd = 0;
-		if (canfd) {
-			printf("CAN interface not CAN FD capable - sorry.\n");
-			return 1;
-		}
-	}
-
-	/* enable CAN FD on the socket */
-	if (mixfd) {
-		/* interface is ok - try to switch the socket into CAN FD mode */
-		if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_FD_FRAMES,
-			       &enable_canfx, sizeof(enable_canfx))){
-			printf("error when enabling CAN FD support\n");
-			return 1;
-		}
-	}
-
-	/* enable CAN XL on the socket */
-	if (mixxl) {
-		/* interface is ok - try to switch the socket into CAN XL mode */
-		if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_XL_FRAMES,
-			       &enable_canfx, sizeof(enable_canfx))){
-			printf("error when enabling CAN XL support\n");
-			return 1;
-		}
-		/* try to enable the CAN XL VCID pass through mode */
-		if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_XL_VCID_OPTS,
-			       &vcid_opts, sizeof(vcid_opts))) {
-			printf("error when enabling CAN XL VCID pass through\n");
-			return 1;
-		}
-	}
-
-	/* sanitize given values */
 	if (canfd || canxl) {
+
+		/* check if the frame fits into the CAN netdevice */
+		if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
+			perror("SIOCGIFMTU");
+			return 1;
+		}
+
 		if (canfd) {
 			/* ensure discrete CAN FD length values 0..8, 12, 16, 20, 24, 32, 64 */
 			cu.fd.len = can_fd_dlc2len(can_fd_len2dlc(cu.fd.len));
@@ -838,6 +793,41 @@ int main(int argc, char **argv)
 			if (cu.fd.len > CANFD_MAX_DLEN)
 				cu.fd.len = CANFD_MAX_DLEN;
 		}
+
+		if (canxl && (ifr.ifr_mtu < (int)CANXL_MIN_MTU)) {
+			printf("CAN interface not CAN XL capable - sorry.\n");
+			return 1;
+		}
+
+		if (canfd && (ifr.ifr_mtu < (int)CANFD_MTU)) {
+			printf("CAN interface not CAN FD capable - sorry.\n");
+			return 1;
+		}
+
+		if (ifr.ifr_mtu == (int)CANFD_MTU) {
+			/* interface is ok - try to switch the socket into CAN FD mode */
+			if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_FD_FRAMES,
+				       &enable_canfx, sizeof(enable_canfx))){
+				printf("error when enabling CAN FD support\n");
+				return 1;
+			}
+		}
+
+		if (ifr.ifr_mtu >= (int)CANXL_MIN_MTU) {
+			/* interface is ok - try to switch the socket into CAN XL mode */
+			if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_XL_FRAMES,
+				       &enable_canfx, sizeof(enable_canfx))){
+				printf("error when enabling CAN XL support\n");
+				return 1;
+			}
+			/* try to enable the CAN XL VCID pass through mode */
+			if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_XL_VCID_OPTS,
+				       &vcid_opts, sizeof(vcid_opts))) {
+				printf("error when enabling CAN XL VCID pass through\n");
+				return 1;
+			}
+		}
+
 	} else {
 		/* sanitize Classical CAN 2.0 frame length */
 		if (len8_dlc) {
@@ -1050,31 +1040,8 @@ int main(int argc, char **argv)
 		}
 
 		ret = do_send_one(s, &cu, mtu, polltimeout);
-		if ((ret == -EINVAL) && mix) {
+		if (ret)
-			/* mix mode: disable unsupported CAN frame type */
-			switch (mtu) {
-			case CAN_MTU:
-				mixcc = 0;
-				break;
-			case CANFD_MTU:
-				mixfd = 0;
-				break;
-			case CANXL_MTU:
-				mixxl = 0;
-				break;
-			default:
-				printf ("mix mode: unknown MTU");
-				return 1;
-			}
-			if (!mixcc && !mixfd && !mixxl) {
-				printf ("mix mode: no valid CAN frame types\n");
-				return 1;
-			}
-		} else if (ret) {
-			/* other error than -ENOBUFS and -EINVAL */
-			perror("write");
 			return 1;
-		}
 
 		if (burst_sent_count >= burst_count)
 			burst_sent_count = 0;
@@ -1115,41 +1082,18 @@ int main(int argc, char **argv)
 		}
 
 		if (mix) {
-			canfd = 0;
-			canxl = 0;
 			i = random();
 			extended = i & 1;
-			if (mixfd) {
+			canfd = i & 2;
-				canfd = i & 2;
+			if (canfd) {
-				if (canfd) {
+				brs = i & 4;
-					brs = i & 4;
+				esi = i & 8;
-					esi = i & 8;
-				}
-			}
-			if (mixxl) {
-				if (mixfd)
-					canxl = ((i & 96) == 96); /* 1/4 */
-				else
-					canxl = ((i & 32) == 32); /* 1/2 */
-			}
-			if (mixcc) {
-				rtr_frame = ((i & 24) == 24); /* reduce RTR to 1/4 */
-			} else {
-				/* no CC frames allowed - CAN XL-only mode? */
-				if (!canxl && !canfd) {
-					/* force XL or FD frames */
-					if (mixxl)
-						canxl = 1;
-					else if (mixfd) {
-						canfd = 1;
-						brs = i & 4;
-						esi = i & 8;
-					} else {
-						printf ("mix mode: no valid CAN frame types\n");
-						return 1;
-					}
-				}
 			}
+			/* generate CAN XL traffic if the interface is capable */
+			if (ifr.ifr_mtu >= (int)CANXL_MIN_MTU)
+				canxl = ((i & 96) == 96);
+
+			rtr_frame = ((i & 24) == 24); /* reduce RTR frames to 1/4 */
 		}
 	}