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

[Peng, Yuan]

Tested-by: Peng,Yuan<yuan.peng at intel.com>

- Tested Branch: dpdk master dpdk-17.11-rc1
- Tested Commit: 87607f45bdecc31c33e9b7666b918dc685a10093
- OS: 4.4.0-62-generic
- GCC: gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
- CPU: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
- NIC: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ [8086:1583]
- Default x86_64-native-linuxapp-gcc configuration
- Prerequisites:
- Total 2cases, 2passed, 0 failed

- Prerequisites command / instruction:
 Two 40Gb Ethernet ports of the DUT are directly connected and link is up.

- Case:
Case1: loopback mode
enable loopback mode:
In dpdk/test/test/test_pmd_perf.c
set::
    .lpbk_mode=1
    #define MAX_TRAFFIC_BURST              32
then make test
start test::
    ./test/test/test -c f -n 4 -- -i
    RTE>>pmd_perf_autotest
The final output of the test will be matrix of average cycles of IO used per
packet, and "Test OK" is printed out.
the peer port can't receive any packet.

case2: physical link mode
disable lookback mode:
In dpdk/test/test/test_pmd_perf.c
set::
    .lpbk_mode=0
    #define MAX_TRAFFIC_BURST              32
then make test
start test::
    ./test/test/test -c f -n 4 -- -i
    RTE>>pmd_perf_autotest
there is not "Test OK" presented.
the peer port can receive all the 32 packets.

-----Original Message-----
From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Yanglong Wu
Sent: Monday, November 20, 2017 12:06 PM
To: dev at dpdk.org
Cc: Wu, Yanglong <yanglong.wu at intel.com>
Subject: [dpdk-dev] [PATCH] net/i40e: i40e support mac loopback

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

Signed-off-by: Yanglong Wu <yanglong.wu at intel.com>
---
 drivers/net/i40e/base/i40e_adminq_cmd.h |  1 +
 drivers/net/i40e/i40e_ethdev.c          | 12 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/net/i40e/base/i40e_adminq_cmd.h b/drivers/net/i40e/base/i40e_adminq_cmd.h
index c36da2a32..8171f877b 100644
--- a/drivers/net/i40e/base/i40e_adminq_cmd.h
+++ b/drivers/net/i40e/base/i40e_adminq_cmd.h
@@ -2128,6 +2128,7 @@ I40E_CHECK_CMD_LENGTH(i40e_aqc_an_advt_reg);
 /* Set Loopback mode (0x0618) */
 struct i40e_aqc_set_lb_mode {
 	__le16	lb_mode;
+#define I40E_AQ_LB_MODE_NONE   0x0
 #define I40E_AQ_LB_PHY_LOCAL	0x01
 #define I40E_AQ_LB_PHY_REMOTE	0x02
 #define I40E_AQ_LB_MAC_LOCAL	0x04
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c index f40c463aa..2e6aa9d0d 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2048,6 +2048,17 @@ i40e_dev_start(struct rte_eth_dev *dev)
 		}
 	}
 
+	/* Enable mac loopback mode */
+	if (hw->mac.type == I40E_MAC_XL710 &&
+	    (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(INFO, "fail to set loopback link");
+			goto err_up;
+		}
+	}
+
 	/* Apply link configure */
 	if (dev->data->dev_conf.link_speeds & ~(ETH_LINK_SPEED_100M |
 				ETH_LINK_SPEED_1G | ETH_LINK_SPEED_10G |
--
2.11.0