[dpdk-dev] [PATCH 4/6] ethdev: introduce TX common tunnel offloads

[Xueming Li]

This patch introduce new DEV_TX_OFFLOAD_GENERIC_TNL_CKSUM_TSO flag for
devices that support tunnel agnostic TX checksum and tso offloading.

Checksum offset and TSO header length are calculated based on mbuf
inner length l*_len, outer_l*_len and tx offload flags PKT_TX_*, tunnel
header length is part of inner l2_len, so device HW do cheksum and TSO
calculation w/o knowledge of perticular tunnel type.

When set application must guarantee that correct header types and
lengths for each inner and outer headers in mbuf header, no need to
specify tunnel type.

Signed-off-by: Xueming Li <xuemingl at mellanox.com>
---
 lib/librte_ether/rte_ethdev.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 57b61ed41..8457d01be 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1003,6 +1003,15 @@ struct rte_eth_conf {
  *   the same mempool and has refcnt = 1.
  */
 #define DEV_TX_OFFLOAD_SECURITY         0x00020000
+/**< Device supports arbitrary tunnel chksum and tso offloading w/o knowing
+ *   tunnel detail. Checksum and TSO are calculated based on mbuf fields:
+ *     l*_len, outer_l*_len
+ *     PKT_TX_OUTER_IPV6, PKT_TX_IPV6
+ *     PKT_TX_IP_CKSUM, PKT_TX_TCP_CKSUM, PKT_TX_UDP_CKSUM
+ *   When set application must guarantee correct header fields, no need to
+ *   specify tunnel type PKT_TX_TUNNEL_* for HW.
+ */
+#define DEV_TX_OFFLOAD_GENERIC_TNL_CKSUM_TSO	0x00040000
 
 struct rte_pci_device;
 
-- 
2.13.3