netdev - [PATCH iwl-next 10/14] idpf: print a debug message and bail in case of non-event ctlq message

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Message-ID: <20250408124816.11584-11-larysa.zaremba@intel.com>
Date: Tue,  8 Apr 2025 14:47:56 +0200
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: intel-wired-lan@...ts.osuosl.org,
	Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: "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>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Mustafa Ismail <mustafa.ismail@...el.com>,
	Tatyana Nikolova <tatyana.e.nikolova@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	Lee Trager <lee@...ger.us>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Larysa Zaremba <larysa.zaremba@...el.com>,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Mateusz Polchlopek <mateusz.polchlopek@...el.com>,
	Wenjun Wu <wenjun1.wu@...el.com>,
	Ahmed Zaki <ahmed.zaki@...el.com>,
	netdev@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Karlsson, Magnus" <magnus.karlsson@...el.com>,
	Emil Tantilov <emil.s.tantilov@...el.com>,
	Madhu Chittim <madhu.chittim@...el.com>,
	Josh Hay <joshua.a.hay@...el.com>,
	Milena Olech <milena.olech@...el.com>,
	pavan.kumar.linga@...el.com,
	"Singhai, Anjali" <anjali.singhai@...el.com>,
	Michal Kubiak <michal.kubiak@...el.com>
Subject: [PATCH iwl-next 10/14] 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: 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 6ff7d5ba3844..d3b4612c3205 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 libeth_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