[RFC v2 1/2] ethdev: port flags for pre-configuration flow hints

[Xiaoyu Min <jackmin@nvidia.com>]

The data-path focused flow rule management can manage flow rules in more
optimized way than traditional one by using hints provided by
application in initialization phase.

In addition to the current hints we have in port attr, more hints could
be provided by application about its behaviour.

One example is how the application do with the same flow rule ?
A. create/destroy flow on same queue but query flow on different queue
   or queue-less way (i.e, counter query)
B. All flow operations will be exactly on the same queue, by which PMD
   could be in more optimized way then A because resource could be
   isolated and access based on queue, without lock, for example.

This patch add flag about above situation and could be extended to cover
more situations.

Signed-off-by: Xiaoyu Min <jackmin@nvidia.com>
---
 lib/ethdev/rte_flow.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
index d8827dd184..38439fcd1d 100644
--- a/lib/ethdev/rte_flow.h
+++ b/lib/ethdev/rte_flow.h
@@ -4948,6 +4948,12 @@ rte_flow_info_get(uint16_t port_id,
 		  struct rte_flow_queue_info *queue_info,
 		  struct rte_flow_error *error);
 
+/**
+ * Indicate all operations for a given flow rule will _strictly_ happen
+ * on the same queue (create/destroy/query/update).
+ */
+#define RTE_FLOW_PORT_FLAG_STRICT_QUEUE RTE_BIT32(0)
+
 /**
  * @warning
  * @b EXPERIMENTAL: this API may change without prior notice.
@@ -4972,6 +4978,11 @@ struct rte_flow_port_attr {
 	 * @see RTE_FLOW_ACTION_TYPE_METER
 	 */
 	uint32_t nb_meters;
+	/**
+	 * Port flags.
+	 * @see RTE_FLOW_PORT_FLAG_STRICT_QUEUE
+	 */
+	uint32_t flags;
 };
 
 /**
-- 
2.36.1