[dpdk-dev] [PATCH 16/26] ixgbe/base: fix flow control for KR backplane

[Wenzhuo Lu]

For the KR backplane which is different from other backplane,
in that we can't use auto-negotiation to determine the
mode. Instead, use whatever the user configured.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 drivers/net/ixgbe/base/ixgbe_api.c    | 12 +++++
 drivers/net/ixgbe/base/ixgbe_api.h    |  1 +
 drivers/net/ixgbe/base/ixgbe_common.c |  7 +--
 drivers/net/ixgbe/base/ixgbe_common.h |  1 +
 drivers/net/ixgbe/base/ixgbe_type.h   |  5 ++
 drivers/net/ixgbe/base/ixgbe_x550.c   | 87 +++++++++++++++++++++++++++++++++++
 drivers/net/ixgbe/base/ixgbe_x550.h   |  1 +
 7 files changed, 111 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ixgbe/base/ixgbe_api.c b/drivers/net/ixgbe/base/ixgbe_api.c
index ff0cd70..e08a2e0 100644
--- a/drivers/net/ixgbe/base/ixgbe_api.c
+++ b/drivers/net/ixgbe/base/ixgbe_api.c
@@ -1069,6 +1069,18 @@ s32 ixgbe_fc_enable(struct ixgbe_hw *hw)
 }
 
 /**
+ *  ixgbe_setup_fc - Set up flow control
+ *  @hw: pointer to hardware structure
+ *
+ *  Called at init time to set up flow control.
+ **/
+s32 ixgbe_setup_fc(struct ixgbe_hw *hw)
+{
+	return ixgbe_call_func(hw, hw->mac.ops.setup_fc, (hw),
+		IXGBE_NOT_IMPLEMENTED);
+}
+
+/**
  * ixgbe_set_fw_drv_ver - Try to send the driver version number FW
  * @hw: pointer to hardware structure
  * @maj: driver major number to be sent to firmware
diff --git a/drivers/net/ixgbe/base/ixgbe_api.h b/drivers/net/ixgbe/base/ixgbe_api.h
index 9ffe196..b08c846 100644
--- a/drivers/net/ixgbe/base/ixgbe_api.h
+++ b/drivers/net/ixgbe/base/ixgbe_api.h
@@ -128,6 +128,7 @@ s32 ixgbe_set_vfta(struct ixgbe_hw *hw, u32 vlan,
 s32 ixgbe_set_vlvf(struct ixgbe_hw *hw, u32 vlan, u32 vind,
 		   bool vlan_on, bool *vfta_changed);
 s32 ixgbe_fc_enable(struct ixgbe_hw *hw);
+s32 ixgbe_setup_fc(struct ixgbe_hw *hw);
 s32 ixgbe_set_fw_drv_ver(struct ixgbe_hw *hw, u8 maj, u8 min, u8 build,
 			 u8 ver);
 s32 ixgbe_get_thermal_sensor_data(struct ixgbe_hw *hw);
diff --git a/drivers/net/ixgbe/base/ixgbe_common.c b/drivers/net/ixgbe/base/ixgbe_common.c
index 3758df1..7a8eb6b 100644
--- a/drivers/net/ixgbe/base/ixgbe_common.c
+++ b/drivers/net/ixgbe/base/ixgbe_common.c
@@ -134,6 +134,7 @@ s32 ixgbe_init_ops_generic(struct ixgbe_hw *hw)
 
 	/* Flow Control */
 	mac->ops.fc_enable = ixgbe_fc_enable_generic;
+	mac->ops.setup_fc = ixgbe_setup_fc_generic;
 
 	/* Link */
 	mac->ops.get_link_capabilities = NULL;
@@ -200,19 +201,19 @@ bool ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw)
 }
 
 /**
- *  ixgbe_setup_fc - Set up flow control
+ *  ixgbe_setup_fc_generic - Set up flow control
  *  @hw: pointer to hardware structure
  *
  *  Called at init time to set up flow control.
  **/
-STATIC s32 ixgbe_setup_fc(struct ixgbe_hw *hw)
+s32 ixgbe_setup_fc_generic(struct ixgbe_hw *hw)
 {
 	s32 ret_val = IXGBE_SUCCESS;
 	u32 reg = 0, reg_bp = 0;
 	u16 reg_cu = 0;
 	bool locked = false;
 
-	DEBUGFUNC("ixgbe_setup_fc");
+	DEBUGFUNC("ixgbe_setup_fc_generic");
 
 	/* Validate the requested mode */
 	if (hw->fc.strict_ieee && hw->fc.requested_mode == ixgbe_fc_rx_pause) {
diff --git a/drivers/net/ixgbe/base/ixgbe_common.h b/drivers/net/ixgbe/base/ixgbe_common.h
index 71507df..fd67a88 100644
--- a/drivers/net/ixgbe/base/ixgbe_common.h
+++ b/drivers/net/ixgbe/base/ixgbe_common.h
@@ -111,6 +111,7 @@ s32 ixgbe_enable_sec_rx_path_generic(struct ixgbe_hw *hw);
 s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw);
 bool ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw);
 void ixgbe_fc_autoneg(struct ixgbe_hw *hw);
+s32 ixgbe_setup_fc_generic(struct ixgbe_hw *hw);
 
 s32 ixgbe_validate_mac_addr(u8 *mac_addr);
 s32 ixgbe_acquire_swfw_sync(struct ixgbe_hw *hw, u32 mask);
diff --git a/drivers/net/ixgbe/base/ixgbe_type.h b/drivers/net/ixgbe/base/ixgbe_type.h
index fb46c97..6a00e5b 100644
--- a/drivers/net/ixgbe/base/ixgbe_type.h
+++ b/drivers/net/ixgbe/base/ixgbe_type.h
@@ -3593,6 +3593,7 @@ struct ixgbe_mac_operations {
 
 	/* Flow Control */
 	s32 (*fc_enable)(struct ixgbe_hw *);
+	s32 (*setup_fc)(struct ixgbe_hw *);
 
 	/* Manageability interface */
 	s32 (*set_fw_drv_ver)(struct ixgbe_hw *, u8, u8, u8, u8);
@@ -3817,6 +3818,7 @@ struct ixgbe_hw {
 
 #define IXGBE_KRM_PORT_CAR_GEN_CTRL(P)	((P == 0) ? (0x4010) : (0x8010))
 #define IXGBE_KRM_LINK_CTRL_1(P)	((P == 0) ? (0x420C) : (0x820C))
+#define IXGBE_KRM_AN_CNTL_1(P)		((P == 0) ? (0x422C) : (0x822C))
 #define IXGBE_KRM_DSP_TXFFE_STATE_4(P)	((P == 0) ? (0x4634) : (0x8634))
 #define IXGBE_KRM_DSP_TXFFE_STATE_5(P)	((P == 0) ? (0x4638) : (0x8638))
 #define IXGBE_KRM_RX_TRN_LINKUP_CTRL(P)	((P == 0) ? (0x4B00) : (0x8B00))
@@ -3839,6 +3841,9 @@ struct ixgbe_hw {
 #define IXGBE_KRM_LINK_CTRL_1_TETH_AN_ENABLE		(1 << 29)
 #define IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART		(1 << 31)
 
+#define IXGBE_KRM_AN_CNTL_1_SYM_PAUSE			(1 << 28)
+#define IXGBE_KRM_AN_CNTL_1_ASM_PAUSE			(1 << 29)
+
 #define IXGBE_KRM_DSP_TXFFE_STATE_C0_EN			(1 << 6)
 #define IXGBE_KRM_DSP_TXFFE_STATE_CP1_CN1_EN		(1 << 15)
 #define IXGBE_KRM_DSP_TXFFE_STATE_CO_ADAPT_EN		(1 << 16)
diff --git a/drivers/net/ixgbe/base/ixgbe_x550.c b/drivers/net/ixgbe/base/ixgbe_x550.c
index 5519507..34ea26f 100644
--- a/drivers/net/ixgbe/base/ixgbe_x550.c
+++ b/drivers/net/ixgbe/base/ixgbe_x550.c
@@ -365,6 +365,10 @@ s32 ixgbe_init_ops_X550EM(struct ixgbe_hw *hw)
 	mac->ops.disable_sec_rx_path = NULL;
 	mac->ops.enable_sec_rx_path = NULL;
 
+	/* AUTOC register is not present in x550EM. */
+	mac->ops.prot_autoc_read = NULL;
+	mac->ops.prot_autoc_write = NULL;
+
 	/* X550EM bus type is internal*/
 	hw->bus.type = ixgbe_bus_type_internal;
 	mac->ops.get_bus_info = ixgbe_get_bus_info_X550em;
@@ -378,6 +382,7 @@ s32 ixgbe_init_ops_X550EM(struct ixgbe_hw *hw)
 	mac->ops.get_supported_physical_layer =
 				    ixgbe_get_supported_physical_layer_X550em;
 
+		mac->ops.setup_fc = ixgbe_setup_fc_X550em;
 	/* PHY */
 	phy->ops.init = ixgbe_init_phy_ops_X550em;
 	phy->ops.identify = ixgbe_identify_phy_x550em;
@@ -2509,3 +2514,85 @@ s32 ixgbe_get_lcd_t_x550em(struct ixgbe_hw *hw, ixgbe_link_speed *lcd_speed)
 	*lcd_speed = IXGBE_LINK_SPEED_10GB_FULL;
 	return status;
 }
+
+/**
+ *  ixgbe_setup_fc_X550em - Set up flow control
+ *  @hw: pointer to hardware structure
+ *
+ *  Called at init time to set up flow control.
+ **/
+s32 ixgbe_setup_fc_X550em(struct ixgbe_hw *hw)
+{
+	s32 ret_val = IXGBE_SUCCESS;
+	u32 pause, asm_dir, reg_val;
+
+	DEBUGFUNC("ixgbe_setup_fc_X550em");
+
+	/* Validate the requested mode */
+	if (hw->fc.strict_ieee && hw->fc.requested_mode == ixgbe_fc_rx_pause) {
+		ERROR_REPORT1(IXGBE_ERROR_UNSUPPORTED,
+			"ixgbe_fc_rx_pause not valid in strict IEEE mode\n");
+		ret_val = IXGBE_ERR_INVALID_LINK_SETTINGS;
+		goto out;
+	}
+
+	/* 10gig parts do not have a word in the EEPROM to determine the
+	 * default flow control setting, so we explicitly set it to full.
+	 */
+	if (hw->fc.requested_mode == ixgbe_fc_default)
+		hw->fc.requested_mode = ixgbe_fc_full;
+
+	/* Determine PAUSE and ASM_DIR bits. */
+	switch (hw->fc.requested_mode) {
+	case ixgbe_fc_none:
+		pause = 0;
+		asm_dir = 0;
+		break;
+	case ixgbe_fc_tx_pause:
+		pause = 0;
+		asm_dir = 1;
+		break;
+	case ixgbe_fc_rx_pause:
+		/* Rx Flow control is enabled and Tx Flow control is
+		 * disabled by software override. Since there really
+		 * isn't a way to advertise that we are capable of RX
+		 * Pause ONLY, we will advertise that we support both
+		 * symmetric and asymmetric Rx PAUSE, as such we fall
+		 * through to the fc_full statement.  Later, we will
+		 * disable the adapter's ability to send PAUSE frames.
+		 */
+	case ixgbe_fc_full:
+		pause = 1;
+		asm_dir = 1;
+		break;
+	default:
+		ERROR_REPORT1(IXGBE_ERROR_ARGUMENT,
+			"Flow control param set incorrectly\n");
+		ret_val = IXGBE_ERR_CONFIG;
+		goto out;
+	}
+
+	if (hw->phy.media_type == ixgbe_media_type_backplane) {
+		ret_val = ixgbe_read_iosf_sb_reg_x550(hw,
+			IXGBE_KRM_AN_CNTL_1(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+		if (ret_val != IXGBE_SUCCESS)
+			goto out;
+		reg_val &= ~(IXGBE_KRM_AN_CNTL_1_SYM_PAUSE |
+			IXGBE_KRM_AN_CNTL_1_ASM_PAUSE);
+		if (pause)
+			reg_val |= IXGBE_KRM_AN_CNTL_1_SYM_PAUSE;
+		if (asm_dir)
+			reg_val |= IXGBE_KRM_AN_CNTL_1_ASM_PAUSE;
+		ret_val = ixgbe_write_iosf_sb_reg_x550(hw,
+			IXGBE_KRM_AN_CNTL_1(hw->bus.lan_id),
+			IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+
+		/* Not all devices fully support AN. */
+		if (hw->device_id == IXGBE_DEV_ID_X550EM_X_KR)
+			hw->fc.disable_fc_autoneg = true;
+	}
+
+out:
+	return ret_val;
+}
diff --git a/drivers/net/ixgbe/base/ixgbe_x550.h b/drivers/net/ixgbe/base/ixgbe_x550.h
index 49b63a8..a922f93 100644
--- a/drivers/net/ixgbe/base/ixgbe_x550.h
+++ b/drivers/net/ixgbe/base/ixgbe_x550.h
@@ -89,6 +89,7 @@ u32 ixgbe_get_supported_physical_layer_X550em(struct ixgbe_hw *hw);
 void ixgbe_disable_rx_x550(struct ixgbe_hw *hw);
 s32 ixgbe_get_lcd_t_x550em(struct ixgbe_hw *hw, ixgbe_link_speed *lcd_speed);
 s32 ixgbe_enter_lplu_t_x550em(struct ixgbe_hw *hw);
+s32 ixgbe_setup_fc_X550em(struct ixgbe_hw *hw);
 s32 ixgbe_setup_mac_link_sfp_x550em(struct ixgbe_hw *hw,
 				    ixgbe_link_speed speed,
 				    bool autoneg_wait_to_complete);
-- 
1.9.3