bnx2x: Fix false link indication at link partner when DAC is used

When driver is unloaded, disable PMD in addition to TX laser, provided that the management firmware will be able to enable it back.
Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x/bnx2x_hsi.h

@@ -1236,6 +1236,7 @@ struct drv_func_mb {
 	#define REQ_BC_VER_4_VRFY_FIRST_PHY_OPT_MDL     0x00050006
 	#define DRV_MSG_CODE_VRFY_SPECIFIC_PHY_OPT_MDL  0xa1000000
 	#define REQ_BC_VER_4_VRFY_SPECIFIC_PHY_OPT_MDL  0x00050234
+	#define REQ_BC_VER_4_SFP_TX_DISABLE_SUPPORTED   0x00070014
 
 	#define DRV_MSG_CODE_DCBX_ADMIN_PMF_MSG         0xb0000000
 	#define DRV_MSG_CODE_DCBX_PMF_DRV_OK            0xb2000000

drivers/net/bnx2x/bnx2x_link.c

@@ -7195,6 +7195,30 @@ static u8 bnx2x_8705_read_status(struct bnx2x_phy *phy,
 /******************************************************************/
 /*			SFP+ module Section			  */
 /******************************************************************/
+static void bnx2x_set_disable_pmd_transmit(struct link_params *params,
+					   struct bnx2x_phy *phy,
+					   u8 pmd_dis)
+{
+	struct bnx2x *bp = params->bp;
+	/*
+	 * Disable transmitter only for bootcodes which can enable it afterwards
+	 * (for D3 link)
+	 */
+	if (pmd_dis) {
+		if (params->feature_config_flags &
+		     FEATURE_CONFIG_BC_SUPPORTS_SFP_TX_DISABLED)
+			DP(NETIF_MSG_LINK, "Disabling PMD transmitter\n");
+		else {
+			DP(NETIF_MSG_LINK, "NOT disabling PMD transmitter\n");
+			return;
+		}
+	} else
+		DP(NETIF_MSG_LINK, "Enabling PMD transmitter\n");
+	bnx2x_cl45_write(bp, phy,
+			 MDIO_PMA_DEVAD,
+			 MDIO_PMA_REG_TX_DISABLE, pmd_dis);
+}
+
 static u8 bnx2x_get_gpio_port(struct link_params *params)
 {
 	u8 gpio_port;
@@ -8598,6 +8622,9 @@ static int bnx2x_8727_config_init(struct bnx2x_phy *phy,
 			 MDIO_PMA_DEVAD, MDIO_PMA_REG_PHY_IDENTIFIER, mod_abs);
 
 
+	/* Enable/Disable PHY transmitter output */
+	bnx2x_set_disable_pmd_transmit(params, phy, 0);
+
 	/* Make MOD_ABS give interrupt on change */
 	bnx2x_cl45_read(bp, phy, MDIO_PMA_DEVAD, MDIO_PMA_REG_8727_PCS_OPT_CTRL,
 			&val);
@@ -8972,6 +8999,10 @@ static void bnx2x_8727_link_reset(struct bnx2x_phy *phy,
 				  struct link_params *params)
 {
 	struct bnx2x *bp = params->bp;
+
+	/* Enable/Disable PHY transmitter output */
+	bnx2x_set_disable_pmd_transmit(params, phy, 1);
+
 	/* Disable Transmitter */
 	bnx2x_sfp_set_transmitter(params, phy, 0);
 	/* Clear LASI */
@@ -11895,6 +11926,10 @@ static int bnx2x_8727_common_init_phy(struct bnx2x *bp,
 		if (bnx2x_8073_8727_external_rom_boot(bp, phy_blk[port],
 						      port_of_path))
 			return -EINVAL;
+		/* Disable PHY transmitter output */
+		bnx2x_cl45_write(bp, phy_blk[port],
+				 MDIO_PMA_DEVAD,
+				 MDIO_PMA_REG_TX_DISABLE, 1);
 
 	}
 	return 0;

drivers/net/bnx2x/bnx2x_link.h

@@ -250,6 +250,7 @@ struct link_params {
 #define FEATURE_CONFIG_PFC_ENABLED			(1<<1)
 #define FEATURE_CONFIG_BC_SUPPORTS_OPT_MDL_VRFY		(1<<2)
 #define FEATURE_CONFIG_BC_SUPPORTS_DUAL_PHY_OPT_MDL_VRFY	(1<<3)
+#define FEATURE_CONFIG_BC_SUPPORTS_SFP_TX_DISABLED		(1<<10)
 	/* Will be populated during common init */
 	struct bnx2x_phy phy[MAX_PHYS];
 

drivers/net/bnx2x/bnx2x_main.c

@@ -8349,6 +8349,10 @@ static void __devinit bnx2x_get_common_hwinfo(struct bnx2x *bp)
 		(val >= REQ_BC_VER_4_VRFY_SPECIFIC_PHY_OPT_MDL) ?
 		FEATURE_CONFIG_BC_SUPPORTS_DUAL_PHY_OPT_MDL_VRFY : 0;
 
+	bp->link_params.feature_config_flags |=
+		(val >= REQ_BC_VER_4_SFP_TX_DISABLE_SUPPORTED) ?
+		FEATURE_CONFIG_BC_SUPPORTS_SFP_TX_DISABLED : 0;
+
 	pci_read_config_word(bp->pdev, bp->pm_cap + PCI_PM_PMC, &pmc);
 	bp->flags |= (pmc & PCI_PM_CAP_PME_D3cold) ? 0 : NO_WOL_FLAG;
 

drivers/net/bnx2x/bnx2x_reg.h

@@ -6618,6 +6618,7 @@ Theotherbitsarereservedandshouldbezero*/
 #define MDIO_PMA_REG_CTRL		0x0
 #define MDIO_PMA_REG_STATUS		0x1
 #define MDIO_PMA_REG_10G_CTRL2		0x7
+#define MDIO_PMA_REG_TX_DISABLE		0x0009
 #define MDIO_PMA_REG_RX_SD		0xa
 /*bcm*/
 #define MDIO_PMA_REG_BCM_CTRL		0x0096