[dpdk-dev] [PATCH v4] net/i40e: support mac loopback

[Yanglong Wu <yanglong.wu@intel.com>]

According to loopback mode, setup loopback link or not.
If loopback link is setted, packets in tx will be sent to rx directly.
Loopback mode can be used to support testing task

Signed-off-by: Yanglong Wu <yanglong.wu@intel.com>
---
v2:
fix coding style issue
---
v3:
update release DOC
---
v4:
remove 'FVL'
---
 doc/guides/rel_notes/release_18_02.rst |  6 ++++++
 drivers/net/i40e/i40e_ethdev.c         | 10 ++++++++++
 drivers/net/i40e/i40e_ethdev.h         |  3 ++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/doc/guides/rel_notes/release_18_02.rst b/doc/guides/rel_notes/release_18_02.rst
index 24b67bb8b..81be184db 100644
--- a/doc/guides/rel_notes/release_18_02.rst
+++ b/doc/guides/rel_notes/release_18_02.rst
@@ -41,6 +41,12 @@ New Features
      Also, make sure to start the actual text at the margin.
      =========================================================
 
+* **Added a mac loopback function for the i40e.**
+
+  Add a mac loopback function for the i40e in order to support test 
+  task asked by users. According to device configuration, it will 
+  setup TX->RX loopback link or not. If loopback link is setted, 
+  packets in tx will be sent to rx directly.
 
 API Changes
 -----------
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 0739f65a8..e8bdb335a 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2047,6 +2047,16 @@ i40e_dev_start(struct rte_eth_dev *dev)
 						     true, NULL);
 		}
 	}
+	
+	/* Enable mac loopback mode */
+	if (dev->data->dev_conf.lpbk_mode == I40E_AQ_LB_MODE_NONE ||
+	dev->data->dev_conf.lpbk_mode == I40E_AQ_LB_PHY_LOCAL) {
+		ret=i40e_aq_set_lb_modes(hw,dev->data->dev_conf.lpbk_mode,NULL);
+		if (ret != I40E_SUCCESS) {
+			PMD_DRV_LOG(ERR, "fail to set loopback link");
+			goto err_up;
+		}
+	}
 
 	/* Apply link configure */
 	if (dev->data->dev_conf.link_speeds & ~(ETH_LINK_SPEED_100M |
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index cd67453d1..2ad9858e4 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -61,7 +61,8 @@
 #define I40E_NUM_MACADDR_MAX       64
 /* Maximum number of VFs */
 #define I40E_MAX_VF               128
-
+/*flag of no loopback*/
+#define I40E_AQ_LB_MODE_NONE	  0x0
 /*
  * vlan_id is a 12 bit number.
  * The VFTA array is actually a 4096 bit array, 128 of 32bit elements.
-- 
2.11.0