[PATCH v3 1/7] net/iavf: discard empty AdminQ descriptors on reset

During PF-initiated resets iavf_clean_arq_element() has been observed
to return success with a fully zeroed descriptor (opcode 0).
These fell through to the default arm of the dispatch switch and
produced a "Request 0 is not supported yet" log flood in the field.

Skip descriptors with opcode 0 so they are silently discarded and do not
flood log.

Signed-off-by: Anurag Mandal <[email protected]>
---
 drivers/net/intel/iavf/iavf_vchnl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/intel/iavf/iavf_vchnl.c b/drivers/net/intel/iavf/iavf_vchnl.c
index f346837bf1..23e4107743 100644
--- a/drivers/net/intel/iavf/iavf_vchnl.c
+++ b/drivers/net/intel/iavf/iavf_vchnl.c
@@ -614,6 +614,11 @@ iavf_handle_virtchnl_msg(struct rte_eth_dev *dev)
 			break;
 		}
 		aq_opc = rte_le_to_cpu_16(info.desc.opcode);
+
+		/* opcode 0 means the descriptor is empty/zeroed, skip it */
+		if (aq_opc == 0)
+			continue;
+
 		/* For the message sent from pf to vf, opcode is stored in
 		 * cookie_high of struct iavf_aq_desc, while return error code
 		 * are stored in cookie_low, Which is done by PF driver.
-- 
2.34.1