qed: Add support for Energy efficient ethernet.

The patch adds required driver support for reading/configuring the
Energy Efficient Ethernet (EEE) parameters.
Signed-off-by: Sudarsana Reddy Kalluru <sudarsana.kalluru@cavium.com>
Signed-off-by: Yuval Mintz <yuval.mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_dev.c

@@ -1684,6 +1684,8 @@ int qed_hw_init(struct qed_dev *cdev, struct qed_hw_init_params *p_params)
 			   "Load request was sent. Load code: 0x%x\n",
 			   load_code);
 
+		qed_mcp_set_capabilities(p_hwfn, p_hwfn->p_main_ptt);
+
 		qed_reset_mb_shadow(p_hwfn, p_hwfn->p_main_ptt);
 
 		p_hwfn->first_on_engine = (load_code ==
@@ -2472,6 +2474,7 @@ static int qed_hw_get_nvm_info(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 {
 	u32 port_cfg_addr, link_temp, nvm_cfg_addr, device_capabilities;
 	u32 nvm_cfg1_offset, mf_mode, addr, generic_cont0, core_cfg;
+	struct qed_mcp_link_capabilities *p_caps;
 	struct qed_mcp_link_params *link;
 
 	/* Read global nvm_cfg address */
@@ -2534,6 +2537,7 @@ static int qed_hw_get_nvm_info(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 
 	/* Read default link configuration */
 	link = &p_hwfn->mcp_info->link_input;
+	p_caps = &p_hwfn->mcp_info->link_capabilities;
 	port_cfg_addr = MCP_REG_SCRATCH + nvm_cfg1_offset +
 			offsetof(struct nvm_cfg1, port[MFW_PORT(p_hwfn)]);
 	link_temp = qed_rd(p_hwfn, p_ptt,
@@ -2588,10 +2592,45 @@ static int qed_hw_get_nvm_info(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 				   NVM_CFG1_PORT_DRV_FLOW_CONTROL_TX);
 	link->loopback_mode = 0;
 
-	DP_VERBOSE(p_hwfn, NETIF_MSG_LINK,
-		   "Read default link: Speed 0x%08x, Adv. Speed 0x%08x, AN: 0x%02x, PAUSE AN: 0x%02x\n",
-		   link->speed.forced_speed, link->speed.advertised_speeds,
-		   link->speed.autoneg, link->pause.autoneg);
+	if (p_hwfn->mcp_info->capabilities & FW_MB_PARAM_FEATURE_SUPPORT_EEE) {
+		link_temp = qed_rd(p_hwfn, p_ptt, port_cfg_addr +
+				   offsetof(struct nvm_cfg1_port, ext_phy));
+		link_temp &= NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_MASK;
+		link_temp >>= NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_OFFSET;
+		p_caps->default_eee = QED_MCP_EEE_ENABLED;
+		link->eee.enable = true;
+		switch (link_temp) {
+		case NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_DISABLED:
+			p_caps->default_eee = QED_MCP_EEE_DISABLED;
+			link->eee.enable = false;
+			break;
+		case NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_BALANCED:
+			p_caps->eee_lpi_timer = EEE_TX_TIMER_USEC_BALANCED_TIME;
+			break;
+		case NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_AGGRESSIVE:
+			p_caps->eee_lpi_timer =
+			    EEE_TX_TIMER_USEC_AGGRESSIVE_TIME;
+			break;
+		case NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_LOW_LATENCY:
+			p_caps->eee_lpi_timer = EEE_TX_TIMER_USEC_LATENCY_TIME;
+			break;
+		}
+
+		link->eee.tx_lpi_timer = p_caps->eee_lpi_timer;
+		link->eee.tx_lpi_enable = link->eee.enable;
+		link->eee.adv_caps = QED_EEE_1G_ADV | QED_EEE_10G_ADV;
+	} else {
+		p_caps->default_eee = QED_MCP_EEE_UNSUPPORTED;
+	}
+
+	DP_VERBOSE(p_hwfn,
+		   NETIF_MSG_LINK,
+		   "Read default link: Speed 0x%08x, Adv. Speed 0x%08x, AN: 0x%02x, PAUSE AN: 0x%02x EEE: %02x [%08x usec]\n",
+		   link->speed.forced_speed,
+		   link->speed.advertised_speeds,
+		   link->speed.autoneg,
+		   link->pause.autoneg,
+		   p_caps->default_eee, p_caps->eee_lpi_timer);
 
 	/* Read Multi-function information from shmem */
 	addr = MCP_REG_SCRATCH + nvm_cfg1_offset +
@@ -2751,6 +2790,27 @@ static void qed_hw_info_port_num(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 		qed_hw_info_port_num_ah(p_hwfn, p_ptt);
 }
 
+static void qed_get_eee_caps(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
+{
+	struct qed_mcp_link_capabilities *p_caps;
+	u32 eee_status;
+
+	p_caps = &p_hwfn->mcp_info->link_capabilities;
+	if (p_caps->default_eee == QED_MCP_EEE_UNSUPPORTED)
+		return;
+
+	p_caps->eee_speed_caps = 0;
+	eee_status = qed_rd(p_hwfn, p_ptt, p_hwfn->mcp_info->port_addr +
+			    offsetof(struct public_port, eee_status));
+	eee_status = (eee_status & EEE_SUPPORTED_SPEED_MASK) >>
+			EEE_SUPPORTED_SPEED_OFFSET;
+
+	if (eee_status & EEE_1G_SUPPORTED)
+		p_caps->eee_speed_caps |= QED_EEE_1G_ADV;
+	if (eee_status & EEE_10G_ADV)
+		p_caps->eee_speed_caps |= QED_EEE_10G_ADV;
+}
+
 static int
 qed_get_hw_info(struct qed_hwfn *p_hwfn,
 		struct qed_ptt *p_ptt,
@@ -2767,6 +2827,8 @@ qed_get_hw_info(struct qed_hwfn *p_hwfn,
 
 	qed_hw_info_port_num(p_hwfn, p_ptt);
 
+	qed_mcp_get_capabilities(p_hwfn, p_ptt);
+
 	qed_hw_get_nvm_info(p_hwfn, p_ptt);
 
 	rc = qed_int_igu_read_cam(p_hwfn, p_ptt);
@@ -2785,6 +2847,8 @@ qed_get_hw_info(struct qed_hwfn *p_hwfn,
 				p_hwfn->mcp_info->func_info.ovlan;
 
 		qed_mcp_cmd_port_init(p_hwfn, p_ptt);
+
+		qed_get_eee_caps(p_hwfn, p_ptt);
 	}
 
 	if (qed_mcp_is_init(p_hwfn)) {

drivers/net/ethernet/qlogic/qed/qed_hsi.h

@@ -10825,6 +10825,17 @@ struct eth_phy_cfg {
 #define ETH_LOOPBACK_EXT		(3)
 #define ETH_LOOPBACK_MAC		(4)
 
+	u32 eee_cfg;
+#define EEE_CFG_EEE_ENABLED			BIT(0)
+#define EEE_CFG_TX_LPI				BIT(1)
+#define EEE_CFG_ADV_SPEED_1G			BIT(2)
+#define EEE_CFG_ADV_SPEED_10G			BIT(3)
+#define EEE_TX_TIMER_USEC_MASK			(0xfffffff0)
+#define EEE_TX_TIMER_USEC_OFFSET		4
+#define EEE_TX_TIMER_USEC_BALANCED_TIME		(0xa00)
+#define EEE_TX_TIMER_USEC_AGGRESSIVE_TIME	(0x100)
+#define EEE_TX_TIMER_USEC_LATENCY_TIME		(0x6000)
+
 	u32 feature_config_flags;
 #define ETH_EEE_MODE_ADV_LPI		(1 << 0)
 };
@@ -11242,6 +11253,25 @@ struct public_port {
 	u32 wol_pkt_len;
 	u32 wol_pkt_details;
 	struct dcb_dscp_map dcb_dscp_map;
+
+	u32 eee_status;
+#define EEE_ACTIVE_BIT			BIT(0)
+#define EEE_LD_ADV_STATUS_MASK		0x000000f0
+#define EEE_LD_ADV_STATUS_OFFSET	4
+#define EEE_1G_ADV			BIT(1)
+#define EEE_10G_ADV			BIT(2)
+#define EEE_LP_ADV_STATUS_MASK		0x00000f00
+#define EEE_LP_ADV_STATUS_OFFSET	8
+#define EEE_SUPPORTED_SPEED_MASK	0x0000f000
+#define EEE_SUPPORTED_SPEED_OFFSET	12
+#define EEE_1G_SUPPORTED		BIT(1)
+#define EEE_10G_SUPPORTED		BIT(2)
+
+	u32 eee_remote;
+#define EEE_REMOTE_TW_TX_MASK   0x0000ffff
+#define EEE_REMOTE_TW_TX_OFFSET 0
+#define EEE_REMOTE_TW_RX_MASK   0xffff0000
+#define EEE_REMOTE_TW_RX_OFFSET 16
 };
 
 struct public_func {
@@ -11570,6 +11600,9 @@ struct public_drv_mb {
 #define DRV_MSG_CODE_GET_PF_RDMA_PROTOCOL	0x002b0000
 #define DRV_MSG_CODE_OS_WOL			0x002e0000
 
+#define DRV_MSG_CODE_FEATURE_SUPPORT		0x00300000
+#define DRV_MSG_CODE_GET_MFW_FEATURE_SUPPORT	0x00310000
+
 #define DRV_MSG_SEQ_NUMBER_MASK			0x0000ffff
 
 	u32 drv_mb_param;
@@ -11653,6 +11686,10 @@ struct public_drv_mb {
 #define DRV_MB_PARAM_BIST_TEST_IMAGE_INDEX_SHIFT	8
 #define DRV_MB_PARAM_BIST_TEST_IMAGE_INDEX_MASK		0x0000FF00
 
+#define DRV_MB_PARAM_FEATURE_SUPPORT_PORT_MASK		0x0000FFFF
+#define DRV_MB_PARAM_FEATURE_SUPPORT_PORT_OFFSET	0
+#define DRV_MB_PARAM_FEATURE_SUPPORT_PORT_EEE		0x00000002
+
 	u32 fw_mb_header;
 #define FW_MSG_CODE_MASK			0xffff0000
 #define FW_MSG_CODE_UNSUPPORTED                 0x00000000
@@ -11696,6 +11733,9 @@ struct public_drv_mb {
 #define FW_MB_PARAM_GET_PF_RDMA_IWARP		0x2
 #define FW_MB_PARAM_GET_PF_RDMA_BOTH		0x3
 
+/* get MFW feature support response */
+#define FW_MB_PARAM_FEATURE_SUPPORT_EEE		0x00000002
+
 #define FW_MB_PARAM_LOAD_DONE_DID_EFUSE_ERROR	(1 << 0)
 
 	u32 drv_pulse_mb;
@@ -11891,7 +11931,16 @@ struct nvm_cfg1_port {
 #define NVM_CFG1_PORT_DRV_FLOW_CONTROL_TX			0x4
 	u32 phy_cfg;
 	u32 mgmt_traffic;
+
 	u32 ext_phy;
+	/* EEE power saving mode */
+#define NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_MASK		0x00FF0000
+#define NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_OFFSET		16
+#define NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_DISABLED		0x0
+#define NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_BALANCED		0x1
+#define NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_AGGRESSIVE		0x2
+#define NVM_CFG1_PORT_EEE_POWER_SAVING_MODE_LOW_LATENCY		0x3
+
 	u32 mba_cfg1;
 	u32 mba_cfg2;
 	u32 vf_cfg;

drivers/net/ethernet/qlogic/qed/qed_main.c

@@ -1297,6 +1297,10 @@ static int qed_set_link(struct qed_dev *cdev, struct qed_link_params *params)
 		}
 	}
 
+	if (params->override_flags & QED_LINK_OVERRIDE_EEE_CONFIG)
+		memcpy(&link_params->eee, &params->eee,
+		       sizeof(link_params->eee));
+
 	rc = qed_mcp_set_link(hwfn, ptt, params->link_up);
 
 	qed_ptt_release(hwfn, ptt);
@@ -1483,6 +1487,21 @@ static void qed_fill_link(struct qed_hwfn *hwfn,
 	if (link.partner_adv_pause == QED_LINK_PARTNER_ASYMMETRIC_PAUSE ||
 	    link.partner_adv_pause == QED_LINK_PARTNER_BOTH_PAUSE)
 		if_link->lp_caps |= QED_LM_Asym_Pause_BIT;
+
+	if (link_caps.default_eee == QED_MCP_EEE_UNSUPPORTED) {
+		if_link->eee_supported = false;
+	} else {
+		if_link->eee_supported = true;
+		if_link->eee_active = link.eee_active;
+		if_link->sup_caps = link_caps.eee_speed_caps;
+		/* MFW clears adv_caps on eee disable; use configured value */
+		if_link->eee.adv_caps = link.eee_adv_caps ? link.eee_adv_caps :
+					params.eee.adv_caps;
+		if_link->eee.lp_adv_caps = link.eee_lp_adv_caps;
+		if_link->eee.enable = params.eee.enable;
+		if_link->eee.tx_lpi_enable = params.eee.tx_lpi_enable;
+		if_link->eee.tx_lpi_timer = params.eee.tx_lpi_timer;
+	}
 }
 
 static void qed_get_current_link(struct qed_dev *cdev,

drivers/net/ethernet/qlogic/qed/qed_mcp.c

@@ -1097,6 +1097,31 @@ static void qed_mcp_handle_transceiver_change(struct qed_hwfn *p_hwfn,
 		DP_NOTICE(p_hwfn, "Transceiver is unplugged.\n");
 }
 
+static void qed_mcp_read_eee_config(struct qed_hwfn *p_hwfn,
+				    struct qed_ptt *p_ptt,
+				    struct qed_mcp_link_state *p_link)
+{
+	u32 eee_status, val;
+
+	p_link->eee_adv_caps = 0;
+	p_link->eee_lp_adv_caps = 0;
+	eee_status = qed_rd(p_hwfn,
+			    p_ptt,
+			    p_hwfn->mcp_info->port_addr +
+			    offsetof(struct public_port, eee_status));
+	p_link->eee_active = !!(eee_status & EEE_ACTIVE_BIT);
+	val = (eee_status & EEE_LD_ADV_STATUS_MASK) >> EEE_LD_ADV_STATUS_OFFSET;
+	if (val & EEE_1G_ADV)
+		p_link->eee_adv_caps |= QED_EEE_1G_ADV;
+	if (val & EEE_10G_ADV)
+		p_link->eee_adv_caps |= QED_EEE_10G_ADV;
+	val = (eee_status & EEE_LP_ADV_STATUS_MASK) >> EEE_LP_ADV_STATUS_OFFSET;
+	if (val & EEE_1G_ADV)
+		p_link->eee_lp_adv_caps |= QED_EEE_1G_ADV;
+	if (val & EEE_10G_ADV)
+		p_link->eee_lp_adv_caps |= QED_EEE_10G_ADV;
+}
+
 static void qed_mcp_handle_link_change(struct qed_hwfn *p_hwfn,
 				       struct qed_ptt *p_ptt, bool b_reset)
 {
@@ -1228,6 +1253,9 @@ static void qed_mcp_handle_link_change(struct qed_hwfn *p_hwfn,
 
 	p_link->sfp_tx_fault = !!(status & LINK_STATUS_SFP_TX_FAULT);
 
+	if (p_hwfn->mcp_info->capabilities & FW_MB_PARAM_FEATURE_SUPPORT_EEE)
+		qed_mcp_read_eee_config(p_hwfn, p_ptt, p_link);
+
 	qed_link_update(p_hwfn);
 out:
 	spin_unlock_bh(&p_hwfn->mcp_info->link_lock);
@@ -1251,6 +1279,19 @@ int qed_mcp_set_link(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt, bool b_up)
 	phy_cfg.pause |= (params->pause.forced_tx) ? ETH_PAUSE_TX : 0;
 	phy_cfg.adv_speed = params->speed.advertised_speeds;
 	phy_cfg.loopback_mode = params->loopback_mode;
+	if (p_hwfn->mcp_info->capabilities & FW_MB_PARAM_FEATURE_SUPPORT_EEE) {
+		if (params->eee.enable)
+			phy_cfg.eee_cfg |= EEE_CFG_EEE_ENABLED;
+		if (params->eee.tx_lpi_enable)
+			phy_cfg.eee_cfg |= EEE_CFG_TX_LPI;
+		if (params->eee.adv_caps & QED_EEE_1G_ADV)
+			phy_cfg.eee_cfg |= EEE_CFG_ADV_SPEED_1G;
+		if (params->eee.adv_caps & QED_EEE_10G_ADV)
+			phy_cfg.eee_cfg |= EEE_CFG_ADV_SPEED_10G;
+		phy_cfg.eee_cfg |= (params->eee.tx_lpi_timer <<
+				    EEE_TX_TIMER_USEC_OFFSET) &
+				   EEE_TX_TIMER_USEC_MASK;
+	}
 
 	p_hwfn->b_drv_link_init = b_up;
 
@@ -2822,3 +2863,28 @@ void qed_mcp_resc_lock_default_init(struct qed_resc_lock_params *p_lock,
 		p_unlock->resource = resource;
 	}
 }
+
+int qed_mcp_get_capabilities(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
+{
+	u32 mcp_resp;
+	int rc;
+
+	rc = qed_mcp_cmd(p_hwfn, p_ptt, DRV_MSG_CODE_GET_MFW_FEATURE_SUPPORT,
+			 0, &mcp_resp, &p_hwfn->mcp_info->capabilities);
+	if (!rc)
+		DP_VERBOSE(p_hwfn, (QED_MSG_SP | NETIF_MSG_PROBE),
+			   "MFW supported features: %08x\n",
+			   p_hwfn->mcp_info->capabilities);
+
+	return rc;
+}
+
+int qed_mcp_set_capabilities(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
+{
+	u32 mcp_resp, mcp_param, features;
+
+	features = DRV_MB_PARAM_FEATURE_SUPPORT_PORT_EEE;
+
+	return qed_mcp_cmd(p_hwfn, p_ptt, DRV_MSG_CODE_FEATURE_SUPPORT,
+			   features, &mcp_resp, &mcp_param);
+}

drivers/net/ethernet/qlogic/qed/qed_mcp.h

@@ -53,15 +53,25 @@ struct qed_mcp_link_pause_params {
 	bool    forced_tx;
 };
 
+enum qed_mcp_eee_mode {
+	QED_MCP_EEE_DISABLED,
+	QED_MCP_EEE_ENABLED,
+	QED_MCP_EEE_UNSUPPORTED
+};
+
 struct qed_mcp_link_params {
-	struct qed_mcp_link_speed_params	speed;
-	struct qed_mcp_link_pause_params	pause;
-	u32				     loopback_mode;
+	struct qed_mcp_link_speed_params speed;
+	struct qed_mcp_link_pause_params pause;
+	u32 loopback_mode;
+	struct qed_link_eee_params eee;
 };
 
 struct qed_mcp_link_capabilities {
 	u32 speed_capabilities;
 	bool default_speed_autoneg;
+	enum qed_mcp_eee_mode default_eee;
+	u32 eee_lpi_timer;
+	u8 eee_speed_caps;
 };
 
 struct qed_mcp_link_state {
@@ -102,6 +112,9 @@ struct qed_mcp_link_state {
 	u8      partner_adv_pause;
 
 	bool    sfp_tx_fault;
+	bool    eee_active;
+	u8      eee_adv_caps;
+	u8      eee_lp_adv_caps;
 };
 
 struct qed_mcp_function_info {
@@ -546,6 +559,9 @@ struct qed_mcp_info {
 	u8					*mfw_mb_shadow;
 	u16					mfw_mb_length;
 	u32					mcp_hist;
+
+	/* Capabilties negotiated with the MFW */
+	u32					capabilities;
 };
 
 struct qed_mcp_mb_params {
@@ -925,5 +941,20 @@ void qed_mcp_resc_lock_default_init(struct qed_resc_lock_params *p_lock,
 				    struct qed_resc_unlock_params *p_unlock,
 				    enum qed_resc_lock
 				    resource, bool b_is_permanent);
+/**
+ * @brief Learn of supported MFW features; To be done during early init
+ *
+ * @param p_hwfn
+ * @param p_ptt
+ */
+int qed_mcp_get_capabilities(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
 
+/**
+ * @brief Inform MFW of set of features supported by driver. Should be done
+ * inside the content of the LOAD_REQ.
+ *
+ * @param p_hwfn
+ * @param p_ptt
+ */
+int qed_mcp_set_capabilities(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
 #endif

include/linux/qed/qed_if.h

@@ -161,6 +161,18 @@ enum qed_nvm_images {
 	QED_NVM_IMAGE_FCOE_CFG,
 };
 
+struct qed_link_eee_params {
+	u32 tx_lpi_timer;
+#define QED_EEE_1G_ADV		BIT(0)
+#define QED_EEE_10G_ADV		BIT(1)
+
+	/* Capabilities are represented using QED_EEE_*_ADV values */
+	u8 adv_caps;
+	u8 lp_adv_caps;
+	bool enable;
+	bool tx_lpi_enable;
+};
+
 enum qed_led_mode {
 	QED_LED_MODE_OFF,
 	QED_LED_MODE_ON,
@@ -408,6 +420,7 @@ struct qed_link_params {
 #define QED_LINK_OVERRIDE_SPEED_FORCED_SPEED    BIT(2)
 #define QED_LINK_OVERRIDE_PAUSE_CONFIG          BIT(3)
 #define QED_LINK_OVERRIDE_LOOPBACK_MODE         BIT(4)
+#define QED_LINK_OVERRIDE_EEE_CONFIG            BIT(5)
 	u32	override_flags;
 	bool	autoneg;
 	u32	adv_speeds;
@@ -422,6 +435,7 @@ struct qed_link_params {
 #define QED_LINK_LOOPBACK_EXT                   BIT(3)
 #define QED_LINK_LOOPBACK_MAC                   BIT(4)
 	u32	loopback_mode;
+	struct qed_link_eee_params eee;
 };
 
 struct qed_link_output {
@@ -437,6 +451,12 @@ struct qed_link_output {
 	u8	port;                   /* In PORT defs */
 	bool	autoneg;
 	u32	pause_config;
+
+	/* EEE - capability & param */
+	bool eee_supported;
+	bool eee_active;
+	u8 sup_caps;
+	struct qed_link_eee_params eee;
 };
 
 struct qed_probe_params {