dpdk: enable tx checksum offloads as default, add disable knob

New startup.conf knob:

dpdk {  ... no-tx-checksum-offload ... }

Change-Id: I337fd57616dd77687300861b411b420a3cb75149
Signed-off-by: Damjan Marion <damarion@cisco.com>

2 files changed, 11 insertions, 2 deletions

diff --git a/src/plugins/dpdk/device/dpdk.h b/src/plugins/dpdk/device/dpdk.h
index efcc5a766bf..c3c98f882e7 100644
--- a/src/plugins/dpdk/device/dpdk.h
+++ b/src/plugins/dpdk/device/dpdk.h
@@ -321,6 +321,7 @@ typedef struct
   u8 *uio_driver_name;
   u8 no_multi_seg;
   u8 enable_tcp_udp_checksum;
+  u8 no_tx_checksum_offload;
 
   /* Required config parameters */
   u8 coremask_set_manually;
diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c
index 8d08da1308f..60f8ce67583 100755
--- a/src/plugins/dpdk/device/init.c
+++ b/src/plugins/dpdk/device/init.c
@@ -331,6 +331,10 @@ dpdk_lib_init (dpdk_main_t * dm)
 
       clib_memcpy (&xd->tx_conf, &dev_info.default_txconf,
 		   sizeof (struct rte_eth_txconf));
+
+      if (dm->conf->no_tx_checksum_offload == 0)
+	xd->tx_conf.txq_flags &= ~ETH_TXQ_FLAGS_NOXSUMS;
+
       if (dm->conf->no_multi_seg)
 	{
 	  xd->tx_conf.txq_flags |= ETH_TXQ_FLAGS_NOMULTSEGS;
@@ -636,8 +640,9 @@ dpdk_lib_init (dpdk_main_t * dm)
 
       hi = vnet_get_hw_interface (dm->vnet_main, xd->hw_if_index);
 
-      if (xd->flags & DPDK_DEVICE_FLAG_TX_OFFLOAD)
-	hi->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD;
+      if (dm->conf->no_tx_checksum_offload == 0)
+	if (xd->flags & DPDK_DEVICE_FLAG_TX_OFFLOAD)
+	  hi->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD;
 
       dpdk_device_setup (xd);
 
@@ -915,6 +920,9 @@ dpdk_config (vlib_main_t * vm, unformat_input_t * input)
       else if (unformat (input, "enable-tcp-udp-checksum"))
 	conf->enable_tcp_udp_checksum = 1;
 
+      else if (unformat (input, "no-tx-checksum-offload"))
+	conf->no_tx_checksum_offload = 1;
+
       else if (unformat (input, "decimal-interface-names"))
 	conf->interface_name_format_decimal = 1;