[dpdk-dev] [PATCH 07/15] net/enic: enable limited PASSTHRU flow action

[Hyong Youb Kim]

Some apps like VPP use PASSTHRU+MARK flow rules to offload packet
matching to the NIC. Just like MARK+RSS used by OVS-DPDK and others,
PASSTHRU+MARK is used to "mark and then receive normally". Recent VIC
adapters support such flow rules, so enable PASSTHRU for this limited
use case.

Signed-off-by: Hyong Youb Kim <hyon...@cisco.com>
---
 drivers/net/enic/enic_flow.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/enic/enic_flow.c b/drivers/net/enic/enic_flow.c
index 0f6b6b930..c6ed9e1b9 100644
--- a/drivers/net/enic/enic_flow.c
+++ b/drivers/net/enic/enic_flow.c
@@ -283,6 +283,7 @@ static const enum rte_flow_action_type 
enic_supported_actions_v2_id[] = {
        RTE_FLOW_ACTION_TYPE_MARK,
        RTE_FLOW_ACTION_TYPE_FLAG,
        RTE_FLOW_ACTION_TYPE_RSS,
+       RTE_FLOW_ACTION_TYPE_PASSTHRU,
        RTE_FLOW_ACTION_TYPE_END,
 };
 
@@ -292,6 +293,7 @@ static const enum rte_flow_action_type 
enic_supported_actions_v2_drop[] = {
        RTE_FLOW_ACTION_TYPE_FLAG,
        RTE_FLOW_ACTION_TYPE_DROP,
        RTE_FLOW_ACTION_TYPE_RSS,
+       RTE_FLOW_ACTION_TYPE_PASSTHRU,
        RTE_FLOW_ACTION_TYPE_END,
 };
 
@@ -302,6 +304,7 @@ static const enum rte_flow_action_type 
enic_supported_actions_v2_count[] = {
        RTE_FLOW_ACTION_TYPE_DROP,
        RTE_FLOW_ACTION_TYPE_COUNT,
        RTE_FLOW_ACTION_TYPE_RSS,
+       RTE_FLOW_ACTION_TYPE_PASSTHRU,
        RTE_FLOW_ACTION_TYPE_END,
 };
 
@@ -1072,6 +1075,7 @@ enic_copy_action_v2(struct enic *enic,
 {
        enum { FATE = 1, MARK = 2, };
        uint32_t overlap = 0;
+       bool passthru = false;
 
        FLOW_TRACE();
 
@@ -1164,6 +1168,19 @@ enic_copy_action_v2(struct enic *enic,
                        overlap |= FATE;
                        break;
                }
+               case RTE_FLOW_ACTION_TYPE_PASSTHRU: {
+                       /*
+                        * Like RSS above, PASSTHRU + MARK may be used to
+                        * "mark and then receive normally". MARK usually comes
+                        * after PASSTHRU, so remember we have seen passthru
+                        * and check for mark later.
+                        */
+                       if (overlap & FATE)
+                               return ENOTSUP;
+                       overlap |= FATE;
+                       passthru = true;
+                       break;
+               }
                case RTE_FLOW_ACTION_TYPE_VOID:
                        continue;
                default:
@@ -1171,6 +1188,9 @@ enic_copy_action_v2(struct enic *enic,
                        break;
                }
        }
+       /* Only PASSTHRU + MARK is allowed */
+       if (passthru && !(overlap & MARK))
+               return ENOTSUP;
        if (!(overlap & FATE))
                return ENOTSUP;
        enic_action->type = FILTER_ACTION_V2;
-- 
2.16.2