[PATCH v2] net/iavf: fix mismatch between rx_pkt_burst and RX descriptor

[Yiding Zhou <yidingx.zhou@intel.com>]

Some kernel drivers return the capability VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC
when IAVF_RXDID_COMMS_OVS_1 is not supported. This causes PMD to use
rx_pkt_burst that handles the Flex Receive Descriptor format, but actually
configures the RXDID into IAVF_RXDID_LEGACY_1, then the fields of rte_mbuf
Will be filled with wrong values in rx_pkt_burst, which will eventually
lead to coredump.

This patch fixes mismatch between rx_pkt_burst and rx descriptor.

Fixes: 12b435bf8f2f ("net/iavf: support flex desc metadata extraction")
Cc: stable@dpdk.org

Signed-off-by: Yiding Zhou <yidingx.zhou@intel.com>
---
 drivers/net/iavf/iavf_rxtx.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 345f6aeebc..ed8d51dbb2 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -2899,14 +2899,23 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
 	struct iavf_adapter *adapter =
 		IAVF_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
 	struct iavf_info *vf = IAVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+	int i;
+	struct iavf_rx_queue *rxq;
+	bool use_flex = true;
+
+	for (i = 0; i < dev->data->nb_rx_queues; i++) {
+		rxq = dev->data->rx_queues[i];
+		if (rxq->rxdid <= IAVF_RXDID_LEGACY_1 ||
+			!(vf->supported_rxdid & BIT(rxq->rxdid))) {
+			use_flex = false;
+			break;
+		}
+	}
 
 #ifdef RTE_ARCH_X86
-	struct iavf_rx_queue *rxq;
-	int i;
 	int check_ret;
 	bool use_avx2 = false;
 	bool use_avx512 = false;
-	bool use_flex = false;
 
 	check_ret = iavf_rx_vec_dev_check(dev);
 	if (check_ret >= 0 &&
@@ -2923,10 +2932,6 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
 			use_avx512 = true;
 #endif
 
-		if (vf->vf_res->vf_cap_flags &
-			VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC)
-			use_flex = true;
-
 		for (i = 0; i < dev->data->nb_rx_queues; i++) {
 			rxq = dev->data->rx_queues[i];
 			(void)iavf_rxq_vec_setup(rxq);
@@ -3030,7 +3035,7 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
 	if (dev->data->scattered_rx) {
 		PMD_DRV_LOG(DEBUG, "Using a Scattered Rx callback (port=%d).",
 			    dev->data->port_id);
-		if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC)
+		if (use_flex)
 			dev->rx_pkt_burst = iavf_recv_scattered_pkts_flex_rxd;
 		else
 			dev->rx_pkt_burst = iavf_recv_scattered_pkts;
@@ -3041,7 +3046,7 @@ iavf_set_rx_function(struct rte_eth_dev *dev)
 	} else {
 		PMD_DRV_LOG(DEBUG, "Using Basic Rx callback (port=%d).",
 			    dev->data->port_id);
-		if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC)
+		if (use_flex)
 			dev->rx_pkt_burst = iavf_recv_pkts_flex_rxd;
 		else
 			dev->rx_pkt_burst = iavf_recv_pkts;
-- 
2.25.1