[dpdk-dev] [PATCH] net/ice: fix outer UDP Tx offload checksum error

[Murphy Yang]

If enable hardware outer UDP TX offload checksum, it doesn't take effect
when send 'IPv6/UDP/VXLAN' packet with error outer UDP checksum.

In order to take effect, set the 'L4T_CS' flag valid only when 'L4TUNT'
equals one and 'EIPT' is not zero. If 'L4T_CS' flag marked, the hardware
can calculate the outer tunneling UDP checksum.

Fixes: bd70c451532c ("net/ice: support Tx checksum offload for tunnel")

Signed-off-by: Murphy Yang <murphyx.yang at intel.com>
---
 drivers/net/ice/ice_rxtx.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 5fbd68eafc..9769e216bf 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -2319,8 +2319,11 @@ ice_parse_tunneling_params(uint64_t ol_flags,
 	*cd_tunneling |= (tx_offload.l2_len >> 1) <<
 		ICE_TXD_CTX_QW0_NATLEN_S;
 
-	if ((ol_flags & PKT_TX_OUTER_UDP_CKSUM) &&
-	    (ol_flags & PKT_TX_OUTER_IP_CKSUM) &&
+	/**
+	 * Calculate the tunneling UDP checksum.
+	 * Shall be set only if L4TUNT = 01b and EIPT is not zero
+	 */
+	if (!(*cd_tunneling & ICE_TX_CTX_EIPT_NONE) &&
 	    (*cd_tunneling & ICE_TXD_CTX_UDP_TUNNELING))
 		*cd_tunneling |= ICE_TXD_CTX_QW0_L4T_CS_M;
 }
-- 
2.17.1