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cangen: auto enable FD/XL content in mixed mode 

Automatically create FD/XL content in mixed mode when the CAN interface
is capable to deal with it.

Suggested-by: Vincent Mailhol <mailhol@kernel.org>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
pull/17/merge
Oliver Hartkopp 2025-09-08 13:21:26 +02:00
parent ed7822c9a2
commit bfbf0c851f
1 changed files with 66 additions and 50 deletions
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116
cangen.c
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@ -180,7 +180,7 @@ static void print_usage(char *prg)
fprintf(stderr, " -X (generate CAN XL CAN frames)\n"); fprintf(stderr, " -X (generate CAN XL CAN frames)\n");
fprintf(stderr, " -R (generate RTR 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, " -8 (allow DLC values greater then 8 for Classic CAN frames)\n");
fprintf(stderr, " -m (mix -e -f -b -E -R -X frames)\n"); fprintf(stderr, " -m (mix CC [-e -R] FD [-f -b -E] XL [-X] on capable devices)\n");
fprintf(stderr, " -I <mode> (CAN ID generation mode - see below)\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, " -L <mode> (CAN data length code (dlc) generation mode - see below)\n");
fprintf(stderr, " -D <mode> (CAN data (payload) generation mode - see below)\n"); fprintf(stderr, " -D <mode> (CAN data (payload) generation mode - see below)\n");
@ -455,6 +455,9 @@ int main(int argc, char **argv)
unsigned char extended = 0; unsigned char extended = 0;
unsigned char canfd = 0; unsigned char canfd = 0;
unsigned char canxl = 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 brs = 0;
unsigned char esi = 0; unsigned char esi = 0;
unsigned char mix = 0; unsigned char mix = 0;
@ -574,7 +577,6 @@ int main(int argc, char **argv)
case 'm': case 'm':
mix = 1; mix = 1;
canfd = 1; /* to switch the socket into CAN FD mode */
view |= CANLIB_VIEW_INDENT_SFF; view |= CANLIB_VIEW_INDENT_SFF;
break; break;
@ -777,14 +779,58 @@ int main(int argc, char **argv)
&loopback, sizeof(loopback)); &loopback, sizeof(loopback));
} }
if (canfd || canxl) { /* get CAN netdevice MTU for frame type capabilities */
if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
perror("SIOCGIFMTU");
return 1;
}
/* check if the frame fits into the CAN netdevice */ /* check CAN XL support */
if (ioctl(s, SIOCGIFMTU, &ifr) < 0) { if (ifr.ifr_mtu < (int)CANXL_MIN_MTU) {
perror("SIOCGIFMTU"); mixxl = 0;
if (canxl) {
printf("CAN interface not CAN XL capable - sorry.\n");
return 1; 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) {
if (canfd) { if (canfd) {
/* ensure discrete CAN FD length values 0..8, 12, 16, 20, 24, 32, 64 */ /* 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)); cu.fd.len = can_fd_dlc2len(can_fd_len2dlc(cu.fd.len));
@ -793,41 +839,6 @@ int main(int argc, char **argv)
if (cu.fd.len > CANFD_MAX_DLEN) if (cu.fd.len > CANFD_MAX_DLEN)
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 { } else {
/* sanitize Classical CAN 2.0 frame length */ /* sanitize Classical CAN 2.0 frame length */
if (len8_dlc) { if (len8_dlc) {
@ -1084,16 +1095,21 @@ int main(int argc, char **argv)
if (mix) { if (mix) {
i = random(); i = random();
extended = i & 1; extended = i & 1;
canfd = i & 2; if (mixfd) {
if (canfd) { canfd = i & 2;
brs = i & 4; if (canfd) {
esi = i & 8; brs = i & 4;
esi = i & 8;
}
} }
/* generate CAN XL traffic if the interface is capable */ if (mixxl) {
if (ifr.ifr_mtu >= (int)CANXL_MIN_MTU) if (mixfd)
canxl = ((i & 96) == 96); canxl = ((i & 96) == 96); /* 1/4 */
else
rtr_frame = ((i & 24) == 24); /* reduce RTR frames to 1/4 */ canxl = ((i & 32) == 32); /* 1/2 */
}
if (mixcc)
rtr_frame = ((i & 24) == 24); /* reduce RTR to 1/4 */
} }
} }