This patch uses the new features of the kernel's netlink CAN interface
making the bus-error reporting configurable and allowing to retrieve
the CAN TX and RX bus error counters via netlink interface. Here is the
output of my test session showing how to use them:
# ip link set can0 up type can bitrate 500000 berr-reporting on
# ip -d -s link show can0
2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
link/can
can <BERR-REPORTING> state ERROR-PASSIVE (berr-counter tx 128 rx 0)
restart-ms 0
CAN bus error counter values ^^^^^^^^^^^
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
sja1000: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 54101 0 1 1 0
RX: bytes packets errors dropped overrun mcast
432808 54101 54101 0 0 0
TX: bytes packets errors dropped carrier collsns
0 0 0 0 0 0
# ifconfig can0 down
# ip link set can0 up type can berr-reporting off
# candump -t d any,0:0,#FFFFFFFF
(0.000000) can0 20000004 [8] 00 08 00 00 00 00 60 00 ERRORFRAME
(0.000474) can0 20000004 [8] 00 20 00 00 00 00 80 00 ERRORFRAME
^^ ^^
\ \___ rxerr
\_____ txerr
Furthermore, the missing support for one-shot mode has been added.
Signed-off-by: Wolfgang Grandegger <[email protected]>
---
diff --git a/include/linux/can/netlink.h b/include/linux/can/netlink.h
index 9ecbb78..3250de9 100644
--- a/include/linux/can/netlink.h
+++ b/include/linux/can/netlink.h
@@ -70,6 +70,14 @@ enum can_state {
};
/*
+ * CAN bus error counters
+ */
+struct can_berr_counter {
+ __u16 txerr;
+ __u16 rxerr;
+};
+
+/*
* CAN controller mode
*/
struct can_ctrlmode {
@@ -77,9 +85,11 @@ struct can_ctrlmode {
__u32 flags;
};
-#define CAN_CTRLMODE_LOOPBACK 0x1 /* Loopback mode */
-#define CAN_CTRLMODE_LISTENONLY 0x2 /* Listen-only mode */
-#define CAN_CTRLMODE_3_SAMPLES 0x4 /* Triple sampling mode */
+#define CAN_CTRLMODE_LOOPBACK 0x01 /* Loopback mode */
+#define CAN_CTRLMODE_LISTENONLY 0x02 /* Listen-only mode */
+#define CAN_CTRLMODE_3_SAMPLES 0x04 /* Triple sampling mode */
+#define CAN_CTRLMODE_ONE_SHOT 0x08 /* One-Shot mode */
+#define CAN_CTRLMODE_BERR_REPORTING 0x10 /* Bus-error reporting */
/*
* CAN device statistics
@@ -105,6 +115,7 @@ enum {
IFLA_CAN_CTRLMODE,
IFLA_CAN_RESTART_MS,
IFLA_CAN_RESTART,
+ IFLA_CAN_BERR_COUNTER,
__IFLA_CAN_MAX
};
diff --git a/ip/iplink_can.c b/ip/iplink_can.c
index 50221e1..c8af4bc 100644
--- a/ip/iplink_can.c
+++ b/ip/iplink_can.c
@@ -30,6 +30,8 @@ static void usage(void)
"\t[ loopback { on | off } ]\n"
"\t[ listen-only { on | off } ]\n"
"\t[ triple-sampling { on | off } ]\n"
+ "\t[ one-shot { on | off } ]\n"
+ "\t[ berr-reporting { on | off } ]\n"
"\n"
"\t[ restart-ms TIME-MS ]\n"
"\t[ restart ]\n"
@@ -84,6 +86,8 @@ static void print_ctrlmode(FILE *f, __u32 cm)
_PF(CAN_CTRLMODE_LOOPBACK, "LOOPBACK");
_PF(CAN_CTRLMODE_LISTENONLY, "LISTEN-ONLY");
_PF(CAN_CTRLMODE_3_SAMPLES, "TRIPLE-SAMPLING");
+ _PF(CAN_CTRLMODE_ONE_SHOT, "ONE-SHOT");
+ _PF(CAN_CTRLMODE_BERR_REPORTING, "BERR-REPORTING");
#undef _PF
if (cm)
fprintf(f, "%x", cm);
@@ -142,6 +146,14 @@ static int can_parse_opt(struct link_util *lu, int argc,
char **argv,
NEXT_ARG();
set_ctrlmode("triple-sampling", *argv, &cm,
CAN_CTRLMODE_3_SAMPLES);
+ } else if (matches(*argv, "one-shot") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("one-shot", *argv, &cm,
+ CAN_CTRLMODE_ONE_SHOT);
+ } else if (matches(*argv, "berr-reporting") == 0) {
+ NEXT_ARG();
+ set_ctrlmode("berr-reporting", *argv, &cm,
+ CAN_CTRLMODE_BERR_REPORTING);
} else if (matches(*argv, "restart") == 0) {
__u32 val = 1;
@@ -200,6 +212,13 @@ static void can_print_opt(struct link_util *lu, FILE *f,
struct rtattr *tb[])
can_state_names[*state] : "UNKNOWN");
}
+ if (tb[IFLA_CAN_BERR_COUNTER]) {
+ struct can_berr_counter *bc =
+ RTA_DATA(tb[IFLA_CAN_BERR_COUNTER]);
+
+ fprintf(f, "(berr-counter tx %d rx %d) ", bc->txerr, bc->rxerr);
+ }
+
if (tb[IFLA_CAN_RESTART_MS]) {
__u32 *restart_ms = RTA_DATA(tb[IFLA_CAN_RESTART_MS]);
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