linux-kernel - [PATCH iwl-next v5 11/15] idpf: print a debug message and bail in case of non-event ctlq message

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Message-ID: <20251117134912.18566-12-larysa.zaremba@intel.com>
Date: Mon, 17 Nov 2025 14:48:51 +0100
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: intel-wired-lan@...ts.osuosl.org,
	Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: aleksander.lobakin@...el.com,
	sridhar.samudrala@...el.com,
	"Singhai, Anjali" <anjali.singhai@...el.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Larysa Zaremba <larysa.zaremba@...el.com>,
	"Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>,
	Emil Tantilov <emil.s.tantilov@...el.com>,
	Madhu Chittim <madhu.chittim@...el.com>,
	Josh Hay <joshua.a.hay@...el.com>,
	"Keller, Jacob E" <jacob.e.keller@...el.com>,
	jayaprakash.shanmugam@...el.com,
	natalia.wochtman@...el.com,
	Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Richard Cochran <richardcochran@...il.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	netdev@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Subject: [PATCH iwl-next v5 11/15] idpf: print a debug message and bail in case of non-event ctlq message

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@...el.com>
Reviewed-by: Michal Kubiak <michal.kubiak@...el.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.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 1099a44314ea..521d90d80e1f 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,
-- 
2.47.0