[dpdk-dev] [RFC] ethdev: add new offload flag to keep CRC

[Ferruh Yigit]

DEV_RX_OFFLOAD_KEEP_CRC offload flag added.

DEV_RX_OFFLOAD_CRC_STRIP flag will remain one more release
default behavior in PMDs is to keep the CRC until this flag removed

Until DEV_RX_OFFLOAD_CRC_STRIP flag is removed:
- Setting both KEEP_CRC & CRC_STRIP is INVALID
- Setting only CRC_STRIP PMD should strip the CRC
- Setting only KEEP_CRC PMD should keep the CRC
- Not setting both PMD should keep the CRC

Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
 doc/guides/rel_notes/deprecation.rst | 10 ----------
 lib/librte_ethdev/rte_ethdev.h       |  4 ++++
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 1ce692eac..cd128ae23 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -67,16 +67,6 @@ Deprecation Notices
   - removal of ``txq_flags`` field from ``rte_eth_txconf`` struct.
   - removal of the offloads bit-field from ``rte_eth_rxmode`` struct.
 
-* ethdev: A new offloading flag ``DEV_RX_OFFLOAD_KEEP_CRC`` will be added in v18.08,
-  This will replace the usage of not setting ``DEV_RX_OFFLOAD_CRC_STRIP`` flag
-  and will be implemented in PMDs accordingly.
-  In v18.08 both ``DEV_RX_OFFLOAD_KEEP_CRC`` and ``DEV_RX_OFFLOAD_CRC_STRIP`` flags
-  will be available, usage will be:
-  ``CRC_STRIP``: Strip CRC from packet
-  ``KEEP_CRC``: Keep CRC in packet
-  Both ``CRC_STRIP`` & ``KEEP_CRC``: Invalid
-  No flag: Keep CRC in packet
-
 * ethdev: In v18.11 ``DEV_RX_OFFLOAD_CRC_STRIP`` offload flag will be removed, default
   behavior without any flag will be changed to CRC strip.
   To keep CRC ``DEV_RX_OFFLOAD_KEEP_CRC`` flag is required.
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 36e3984ea..c81af09f8 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -939,6 +939,10 @@ struct rte_eth_conf {
 #define DEV_RX_OFFLOAD_SCATTER		0x00002000
 #define DEV_RX_OFFLOAD_TIMESTAMP	0x00004000
 #define DEV_RX_OFFLOAD_SECURITY         0x00008000
+
+/* Invalid to set both DEV_RX_OFFLOAD_CRC_STRIP and DEV_RX_OFFLOAD_KEEP_CRC
+ * No DEV_RX_OFFLOAD_CRC_STRIP flag means keep CRC */
+#define DEV_RX_OFFLOAD_KEEP_CRC		0x00010000
 #define DEV_RX_OFFLOAD_CHECKSUM (DEV_RX_OFFLOAD_IPV4_CKSUM | \
 				 DEV_RX_OFFLOAD_UDP_CKSUM | \
 				 DEV_RX_OFFLOAD_TCP_CKSUM)
-- 
2.14.4