[PATCH net-next v4 11/15] idpf: print a debug message and bail in case of non-event ctlq message

[Tony Nguyen <anthony.l.nguyen@intel.com>]

From: Larysa Zaremba <larysa.zaremba@intel.com>

Unlike previous internal idpf ctlq implementation, idpf calls the default
message handler for all received messages that do not have a matching xn
transaction, not only for VIRTCHNL2_OP_EVENT. This leads to many error
messages printing garbage, because the parsing expected a valid event
message, but got e.g. a delayed response for a timed-out transaction.

The information about timed-out transactions and otherwise unhandleable
messages can still be valuable for developers, so print the information
with dynamic debug and exit the function, so the following functions can
parse valid events in peace.

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
index 1b5935e9c538..bf63fc71d6ae 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
@@ -84,6 +84,13 @@ void idpf_recv_event_msg(struct libie_ctlq_ctx *ctx,
 	u32 event;
 
 	adapter = container_of(ctx, struct idpf_adapter, ctlq_ctx);
+	if (ctlq_msg->chnl_opcode != VIRTCHNL2_OP_EVENT) {
+		dev_dbg(&adapter->pdev->dev,
+			"Unhandled message with opcode %u from CP\n",
+			ctlq_msg->chnl_opcode);
+		goto free_rx_buf;
+	}
+
 	if (payload_size < sizeof(*v2e)) {
 		dev_err_ratelimited(&adapter->pdev->dev, "Failed to receive valid payload for event msg (op %d len %d)\n",
 				    ctlq_msg->chnl_opcode,
-- 
2.47.1