diff options
| author | Davide Caratti <dcaratti@redhat.com> | 2025-06-04 18:06:04 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2025-06-10 10:23:30 +0200 |
| commit | 127c49624a0980ee7b8a5ba9094d6942332a48da (patch) | |
| tree | 71e9014b1f7f595c54558aa02fe7220877f70fcf | |
| parent | 9e97db3c075a77d15a6be26541e7dad22dbfc793 (diff) | |
can: add drop reasons in the receive path of AF_CAN
Besides the existing pr_warn_once(), use skb drop reasons in case AF_CAN
layer drops non-conformant CAN{,FD,XL} frames, or conformant frames
received by "wrong" devices, so that it's possible to debug (and count)
such events using existing tracepoints:
| # perf record -e skb:kfree_skb -aR -- ./drv/canfdtest -v -g -l 1 vcan0
| # perf script
| [...]
| canfdtest 1123 [000] 3893.271264: skb:kfree_skb: skbaddr=0xffff975703c9f700 rx_sk=(nil) protocol=12 location=can_rcv+0x4b reason: CAN_RX_INVALID_FRAME
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Link: https://patch.msgid.link/20250604160605.1005704-2-dcaratti@redhat.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
| -rw-r--r-- | include/net/dropreason-core.h | 18 | ||||
| -rw-r--r-- | net/can/af_can.c | 6 |
2 files changed, 21 insertions, 3 deletions
diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index bcf9d7467e1a..b9e78290269e 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -121,6 +121,9 @@ FN(ARP_PVLAN_DISABLE) \ FN(MAC_IEEE_MAC_CONTROL) \ FN(BRIDGE_INGRESS_STP_STATE) \ + FN(CAN_RX_INVALID_FRAME) \ + FN(CANFD_RX_INVALID_FRAME) \ + FN(CANXL_RX_INVALID_FRAME) \ FNe(MAX) /** @@ -574,6 +577,21 @@ enum skb_drop_reason { */ SKB_DROP_REASON_BRIDGE_INGRESS_STP_STATE, /** + * @SKB_DROP_REASON_CAN_RX_INVALID_FRAME: received + * non conform CAN frame (or device is unable to receive CAN frames) + */ + SKB_DROP_REASON_CAN_RX_INVALID_FRAME, + /** + * @SKB_DROP_REASON_CANFD_RX_INVALID_FRAME: received + * non conform CAN-FD frame (or device is unable to receive CAN frames) + */ + SKB_DROP_REASON_CANFD_RX_INVALID_FRAME, + /** + * @SKB_DROP_REASON_CANXL_RX_INVALID_FRAME: received + * non conform CAN-XL frame (or device is unable to receive CAN frames) + */ + SKB_DROP_REASON_CANXL_RX_INVALID_FRAME, + /** * @SKB_DROP_REASON_MAX: the maximum of core drop reasons, which * shouldn't be used as a real 'reason' - only for tracing code gen */ diff --git a/net/can/af_can.c b/net/can/af_can.c index 4aab7033c933..b2387a46794a 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -683,7 +683,7 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n", dev->type, skb->len); - kfree_skb(skb); + kfree_skb_reason(skb, SKB_DROP_REASON_CAN_RX_INVALID_FRAME); return NET_RX_DROP; } @@ -698,7 +698,7 @@ static int canfd_rcv(struct sk_buff *skb, struct net_device *dev, pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n", dev->type, skb->len); - kfree_skb(skb); + kfree_skb_reason(skb, SKB_DROP_REASON_CANFD_RX_INVALID_FRAME); return NET_RX_DROP; } @@ -713,7 +713,7 @@ static int canxl_rcv(struct sk_buff *skb, struct net_device *dev, pr_warn_once("PF_CAN: dropped non conform CAN XL skbuff: dev type %d, len %d\n", dev->type, skb->len); - kfree_skb(skb); + kfree_skb_reason(skb, SKB_DROP_REASON_CANXL_RX_INVALID_FRAME); return NET_RX_DROP; } |