[dpdk-dev] [PATCH v4 10/11] net/igc: implement MAC-loopback mode

[alvinx.zhang@intel.com]

From: Alvin Zhang <alvinx.zhang@intel.com>

enable mac-loopback mode.

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---
 drivers/net/igc/igc_ethdev.c | 23 +++++++++++++++++++++++
 drivers/net/igc/igc_txrx.c   |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/igc/igc_ethdev.c b/drivers/net/igc/igc_ethdev.c
index e2e427c..ef507c2 100644
--- a/drivers/net/igc/igc_ethdev.c
+++ b/drivers/net/igc/igc_ethdev.c
@@ -50,10 +50,17 @@
 /* External VLAN Enable bit mask */
 #define IGC_CTRL_EXT_EXT_VLAN		(1u << 26)
 
+/* Speed select */
+#define IGC_CTRL_SPEED_MASK		(7u << 8)
+#define IGC_CTRL_SPEED_2500		(6u << 8)
+
 /* External VLAN Ether Type bit mask and shift */
 #define IGC_VET_EXT			0xFFFF0000
 #define IGC_VET_EXT_SHIFT		16
 
+/* Force EEE Auto-negotiation */
+#define IGC_EEER_EEE_FRC_AN		(1u << 28)
+
 /* Per Queue Good Packets Received Count */
 #define IGC_PQGPRC(idx)		(0x10010 + 0x100 * (idx))
 /* Per Queue Good Octets Received Count */
@@ -635,6 +642,9 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
 	/* disable all wake up */
 	IGC_WRITE_REG(hw, IGC_WUC, 0);
 
+	/* disable checking EEE operation in MAC loopback mode */
+	igc_read_reg_check_clear_bits(hw, IGC_EEER, IGC_EEER_EEE_FRC_AN);
+
 	/* Set bit for Go Link disconnect */
 	igc_read_reg_check_set_bits(hw, IGC_82580_PHY_POWER_MGMT,
 			IGC_82580_PM_GO_LINKD);
@@ -1060,6 +1070,19 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
 	eth_igc_rxtx_control(dev, true);
 	eth_igc_link_update(dev, 0);
 
+	/* configure MAC-loopback mode */
+	if (dev->data->dev_conf.lpbk_mode == 1) {
+		uint32_t reg_val;
+
+		reg_val = IGC_READ_REG(hw, IGC_CTRL);
+		reg_val &= ~IGC_CTRL_SPEED_MASK;
+		reg_val |= IGC_CTRL_SLU | IGC_CTRL_FRCSPD |
+			IGC_CTRL_FRCDPX | IGC_CTRL_FD | IGC_CTRL_SPEED_2500;
+		IGC_WRITE_REG(hw, IGC_CTRL, reg_val);
+
+		igc_read_reg_check_set_bits(hw, IGC_EEER, IGC_EEER_EEE_FRC_AN);
+	}
+
 	return 0;
 
 error_invalid_config:
diff --git a/drivers/net/igc/igc_txrx.c b/drivers/net/igc/igc_txrx.c
index 8f78f00..e6fa619 100644
--- a/drivers/net/igc/igc_txrx.c
+++ b/drivers/net/igc/igc_txrx.c
@@ -1142,6 +1142,9 @@ int eth_igc_rx_descriptor_status(void *rx_queue, uint16_t offset)
 			IGC_RCTL_DPF |
 			(hw->mac.mc_filter_type << IGC_RCTL_MO_SHIFT);
 
+	if (dev->data->dev_conf.lpbk_mode == 1)
+		rctl |= IGC_RCTL_LBM_MAC;
+
 	rctl &= ~(IGC_RCTL_HSEL_MSK | IGC_RCTL_CFIEN | IGC_RCTL_CFI |
 			IGC_RCTL_PSP | IGC_RCTL_PMCF);
 
-- 
1.8.3.1