can: netlink support for bus-error reporting and counters

This patch makes the bus-error reporting configurable and allows to
retrieve the CAN TX and RX bus error counters via netlink interface.
I have added support for the SJA1000. The TX and RX bus error counters
are also copied to the data fields 6..7 of error messages when state
changes are reported.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 16 insertions, 4 deletions

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index c8c660a79f90..6e5a7f00223d 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -47,6 +47,8 @@ struct can_priv {
         int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
         int (*do_get_state)(const struct net_device *dev,
                             enum can_state *state);
+        int (*do_get_berr_counter)(const struct net_device *dev,
+                                   struct can_berr_counter *bec);
 
         unsigned int echo_skb_max;
         struct sk_buff **echo_skb;
diff --git a/include/linux/can/netlink.h b/include/linux/can/netlink.h
index c818335fbb13..3250de935e1a 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 {
@@ -77,10 +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_ONE_SHOT   0x8     /* One-Shot 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
@@ -106,6 +115,7 @@ enum {
         IFLA_CAN_CTRLMODE,
         IFLA_CAN_RESTART_MS,
         IFLA_CAN_RESTART,
+        IFLA_CAN_BERR_COUNTER,
         __IFLA_CAN_MAX
 };