[dpdk-dev] [PATCH] net/i40e: Fail rte_flow MARK requests if RX func was vectorized

[Mesut Ali Ergin <mesut.a.ergin@intel.com>]

Runtime requests to install an rte_flow with MARK action should fail
if a vector RX function was already chosen for the device during
configuration time.

Currently, i40e rte_flow driver would successfully install the flow
with MARK action, even when vector RX functions are in use. However,
those vector RX functions will fail to retrieve the MARK data from the
device descriptor into the mbuf. The original app  installing the flow
would never know what went wrong. The change introduced in this patch
must be reverted if/when vector RX functions start supporting correct
FDIR processing for MARK actions.

Signed-off-by: Mesut Ali Ergin <mesut.a.ergin@intel.com>
---
 drivers/net/i40e/i40e_flow.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index 3afd779..9a14a1c 100644
--- a/drivers/net/i40e/i40e_flow.c
+++ b/drivers/net/i40e/i40e_flow.c
@@ -22,6 +22,7 @@
 #include "base/i40e_type.h"
 #include "base/i40e_prototype.h"
 #include "i40e_ethdev.h"
+#include "i40e_rxtx.h"
 
 #define I40E_IPV6_TC_MASK	(0xFF << I40E_FDIR_IPv6_TC_OFFSET)
 #define I40E_IPV6_FRAG_HEADER	44
@@ -3079,6 +3080,16 @@ i40e_flow_parse_fdir_action(struct rte_eth_dev *dev,
 		filter->action.behavior = I40E_FDIR_PASSTHRU;
 		break;
 	case RTE_FLOW_ACTION_TYPE_MARK:
+		if (dev->rx_pkt_burst == i40e_recv_scattered_pkts_vec ||
+		    dev->rx_pkt_burst == i40e_recv_pkts_vec ||
+		    dev->rx_pkt_burst == i40e_recv_scattered_pkts_vec_avx2 ||
+		    dev->rx_pkt_burst == i40e_recv_pkts_vec_avx2) {
+			/* Vector RX Functions do not support MARK*/
+			rte_flow_error_set(error, EINVAL,
+					   RTE_FLOW_ERROR_TYPE_ACTION, act,
+					   "Action not supported when vector RX is in use.");
+			return -rte_errno;
+		}
 		filter->action.behavior = I40E_FDIR_PASSTHRU;
 		mark_spec = act->conf;
 		filter->action.report_status = I40E_FDIR_REPORT_ID;
@@ -3103,6 +3114,16 @@ i40e_flow_parse_fdir_action(struct rte_eth_dev *dev,
 			   "Invalid action.");
 			return -rte_errno;
 		}
+		if (dev->rx_pkt_burst == i40e_recv_scattered_pkts_vec ||
+		    dev->rx_pkt_burst == i40e_recv_pkts_vec ||
+		    dev->rx_pkt_burst == i40e_recv_scattered_pkts_vec_avx2 ||
+		    dev->rx_pkt_burst == i40e_recv_pkts_vec_avx2) {
+			/* Vector RX Functions do not support MARK*/
+			rte_flow_error_set(error, EINVAL,
+					   RTE_FLOW_ERROR_TYPE_ACTION, act,
+					   "Action not supported when vector RX is in use.");
+			return -rte_errno;
+		}
 		mark_spec = act->conf;
 		filter->action.report_status = I40E_FDIR_REPORT_ID;
 		filter->soft_id = mark_spec->id;
-- 
2.7.4