[RFC PATCH] ethdev: support Rx data discard

[Gregory Etelson <getelson@nvidia.com>]

In some cases application does not need to receive entire packet
from port hardware.
If application could fetch required data only and safely discard the
rest of Rx packet data, that could improve port performance by
reducing PCI bandwidth.

The RTE_ETH_DEV_DISCARD_RX_DATA device capability flag notifies that
a port hardware supports Rx data discard.

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
---
 lib/ethdev/rte_ethdev.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
index a66c2abbdb..10938ddad3 100644
--- a/lib/ethdev/rte_ethdev.h
+++ b/lib/ethdev/rte_ethdev.h
@@ -2170,6 +2170,8 @@ struct rte_eth_dev_owner {
  * PMDs filling the queue xstats themselves should not set this flag
  */
 #define RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS RTE_BIT32(6)
+/** Device supports Rx data discard */
+#define RTE_ETH_DEV_DISCARD_RX_DATA RTE_BIT32(7)
 /**@}*/
 
 /**
-- 
2.51.0