[dpdk-dev] [PATCH 1/3] pmd: add new flag to indicate TX TSO operation on the packet

[miroslaw.walukiewicz at intel.com]

From: Miroslaw Walukiewicz <miroslaw.walukiewicz at intel.com>

Transmission of TCP packets could be accelerated by
HW Transmit Segmentation Offload. With TSO packets up to
64K could be transmismitted.

When this flag is set the PMD drived will enable TCP segmentation.

The new field tso_segsz is added to indicate how long is TCP TSO segment.

Signed-off-by: Mirek Walukiewicz <miroslaw.walukiewicz at intel.com>
---
 lib/librte_mbuf/rte_mbuf.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index ddadc21..63cbc36 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -117,6 +117,9 @@ extern "C" {
 /* Use final bit of flags to indicate a control mbuf */
 #define CTRL_MBUF_FLAG       (1ULL << 63) /**< Mbuf contains control data */
 
+/* Bit 50 - TSO (TCP Transmit Segmenation Offload) */
+#define PKT_TX_TCP_TSO       (1ULL << 50) /**< Mbuf needs TSO enabling */
+
 /**
  * Bit Mask to indicate what bits required for building TX context
  */
@@ -196,6 +199,8 @@ struct rte_mbuf {
 			uint16_t l2_len:7;      /**< L2 (MAC) Header Length. */
 		};
 	};
+	/* field to support TSO segment size */
+	uint32_t tso_segsz;
 } __rte_cache_aligned;
 
 /**