bnx2x: sfp+ Tx fault detection added

Adds the ability to identify sfp+ modules' Tx fault, and when such
occur shut down the link.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 99 insertions, 16 deletions

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
index 6b776309e0a1..e7c390c66b2a 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
@@ -1150,6 +1150,7 @@ struct drv_port_mb {
         u32 link_status;
         /* Driver should update this field on any link change event */
 
+        #define LINK_STATUS_NONE                                (0<<0)
         #define LINK_STATUS_LINK_FLAG_MASK                      0x00000001
         #define LINK_STATUS_LINK_UP                             0x00000001
         #define LINK_STATUS_SPEED_AND_DUPLEX_MASK               0x0000001E
@@ -1207,6 +1208,7 @@ struct drv_port_mb {
         #define LINK_STATUS_PFC_ENABLED                         0x20000000
 
         #define LINK_STATUS_PHYSICAL_LINK_FLAG                  0x40000000
+        #define LINK_STATUS_SFP_TX_FAULT                        0x80000000
 
         u32 port_stx;
 
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
index 91aa565d4374..9e008e4534d4 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
@@ -4746,6 +4746,8 @@ void bnx2x_sync_link(struct link_params *params,
                 vars->mac_type = MAC_TYPE_NONE;
                 if (vars->link_status & LINK_STATUS_PHYSICAL_LINK_FLAG)
                         vars->phy_flags |= PHY_HALF_OPEN_CONN_FLAG;
+                if (vars->link_status & LINK_STATUS_SFP_TX_FAULT)
+                        vars->phy_flags |= PHY_SFP_TX_FAULT_FLAG;
         }
 }
 
@@ -12925,30 +12927,41 @@ static void bnx2x_check_over_curr(struct link_params *params,
                 vars->phy_flags &= ~PHY_OVER_CURRENT_FLAG;
 }
 
-static void bnx2x_analyze_link_error(struct link_params *params,
-                                     struct link_vars *vars, u32 lss_status,
-                                     u8 notify)
+/* Returns 0 if no change occured since last check; 1 otherwise. */
+static u8 bnx2x_analyze_link_error(struct link_params *params,
+                                    struct link_vars *vars, u32 status,
+                                    u32 phy_flag, u32 link_flag, u8 notify)
 {
         struct bnx2x *bp = params->bp;
         /* Compare new value with previous value */
         u8 led_mode;
-        u32 half_open_conn = (vars->phy_flags & PHY_HALF_OPEN_CONN_FLAG) > 0;
+        u32 old_status = (vars->phy_flags & phy_flag) ? 1 : 0;
 
-        if ((lss_status ^ half_open_conn) == 0)
-                return;
+        if ((status ^ old_status) == 0)
+                return 0;
 
         /* If values differ */
-        DP(NETIF_MSG_LINK, "Link changed:%x %x->%x\n", vars->link_up,
-                       half_open_conn, lss_status);
+        switch (phy_flag) {
+        case PHY_HALF_OPEN_CONN_FLAG:
+                DP(NETIF_MSG_LINK, "Analyze Remote Fault\n");
+                break;
+        case PHY_SFP_TX_FAULT_FLAG:
+                DP(NETIF_MSG_LINK, "Analyze TX Fault\n");
+                break;
+        default:
+                DP(NETIF_MSG_LINK, "Analyze UNKOWN\n");
+        }
+        DP(NETIF_MSG_LINK, "Link changed:[%x %x]->%x\n", vars->link_up,
+           old_status, status);
 
         /* a. Update shmem->link_status accordingly
          * b. Update link_vars->link_up
          */
-        if (lss_status) {
-                DP(NETIF_MSG_LINK, "Remote Fault detected !!!\n");
+        if (status) {
                 vars->link_status &= ~LINK_STATUS_LINK_UP;
+                vars->link_status |= link_flag;
                 vars->link_up = 0;
-                vars->phy_flags |= PHY_HALF_OPEN_CONN_FLAG;
+                vars->phy_flags |= phy_flag;
 
                 /* activate nig drain */
                 REG_WR(bp, NIG_REG_EGRESS_DRAIN0_MODE + params->port*4, 1);
@@ -12957,10 +12970,10 @@ static void bnx2x_analyze_link_error(struct link_params *params,
                  */
                 led_mode = LED_MODE_OFF;
         } else {
-                DP(NETIF_MSG_LINK, "Remote Fault cleared\n");
                 vars->link_status |= LINK_STATUS_LINK_UP;
+                vars->link_status &= ~link_flag;
                 vars->link_up = 1;
-                vars->phy_flags &= ~PHY_HALF_OPEN_CONN_FLAG;
+                vars->phy_flags &= ~phy_flag;
                 led_mode = LED_MODE_OPER;
 
                 /* Clear nig drain */
@@ -12977,6 +12990,8 @@ static void bnx2x_analyze_link_error(struct link_params *params,
         vars->periodic_flags |= PERIODIC_FLAGS_LINK_EVENT;
         if (notify)
                 bnx2x_notify_link_changed(bp);
+
+        return 1;
 }
 
 /******************************************************************************
@@ -13018,7 +13033,9 @@ int bnx2x_check_half_open_conn(struct link_params *params,
                 if (REG_RD(bp, mac_base + XMAC_REG_RX_LSS_STATUS))
                         lss_status = 1;
 
-                bnx2x_analyze_link_error(params, vars, lss_status, notify);
+                bnx2x_analyze_link_error(params, vars, lss_status,
+                                         PHY_HALF_OPEN_CONN_FLAG,
+                                         LINK_STATUS_NONE, notify);
         } else if (REG_RD(bp, MISC_REG_RESET_REG_2) &
                    (MISC_REGISTERS_RESET_REG_2_RST_BMAC0 << params->port)) {
                 /* Check E1X / E2 BMAC */
@@ -13035,11 +13052,55 @@ int bnx2x_check_half_open_conn(struct link_params *params,
                 REG_RD_DMAE(bp, mac_base + lss_status_reg, wb_data, 2);
                 lss_status = (wb_data[0] > 0);
 
-                bnx2x_analyze_link_error(params, vars, lss_status, notify);
+                bnx2x_analyze_link_error(params, vars, lss_status,
+                                         PHY_HALF_OPEN_CONN_FLAG,
+                                         LINK_STATUS_NONE, notify);
         }
         return 0;
 }
+static void bnx2x_sfp_tx_fault_detection(struct bnx2x_phy *phy,
+                                         struct link_params *params,
+                                         struct link_vars *vars)
+{
+        struct bnx2x *bp = params->bp;
+        u32 cfg_pin, value = 0;
+        u8 led_change, port = params->port;
 
+        /* Get The SFP+ TX_Fault controlling pin ([eg]pio) */
+        cfg_pin = (REG_RD(bp, params->shmem_base + offsetof(struct shmem_region,
+                          dev_info.port_hw_config[port].e3_cmn_pin_cfg)) &
+                   PORT_HW_CFG_E3_TX_FAULT_MASK) >>
+                  PORT_HW_CFG_E3_TX_FAULT_SHIFT;
+
+        if (bnx2x_get_cfg_pin(bp, cfg_pin, &value)) {
+                DP(NETIF_MSG_LINK, "Failed to read pin 0x%02x\n", cfg_pin);
+                return;
+        }
+
+        led_change = bnx2x_analyze_link_error(params, vars, value,
+                                              PHY_SFP_TX_FAULT_FLAG,
+                                              LINK_STATUS_SFP_TX_FAULT, 1);
+
+        if (led_change) {
+                /* Change TX_Fault led, set link status for further syncs */
+                u8 led_mode;
+
+                if (vars->phy_flags & PHY_SFP_TX_FAULT_FLAG) {
+                        led_mode = MISC_REGISTERS_GPIO_HIGH;
+                        vars->link_status |= LINK_STATUS_SFP_TX_FAULT;
+                } else {
+                        led_mode = MISC_REGISTERS_GPIO_LOW;
+                        vars->link_status &= ~LINK_STATUS_SFP_TX_FAULT;
+                }
+
+                /* If module is unapproved, led should be on regardless */
+                if (!(phy->flags & FLAGS_SFP_NOT_APPROVED)) {
+                        DP(NETIF_MSG_LINK, "Change TX_Fault LED: ->%x\n",
+                           led_mode);
+                        bnx2x_set_e3_module_fault_led(params, led_mode);
+                }
+        }
+}
 void bnx2x_period_func(struct link_params *params, struct link_vars *vars)
 {
         u16 phy_idx;
@@ -13058,7 +13119,26 @@ void bnx2x_period_func(struct link_params *params, struct link_vars *vars)
                 struct bnx2x_phy *phy = &params->phy[INT_PHY];
                 bnx2x_set_aer_mmd(params, phy);
                 bnx2x_check_over_curr(params, vars);
-                bnx2x_warpcore_config_runtime(phy, params, vars);
+                if (vars->rx_tx_asic_rst)
+                        bnx2x_warpcore_config_runtime(phy, params, vars);
+
+                if ((REG_RD(bp, params->shmem_base +
+                            offsetof(struct shmem_region, dev_info.
+                                port_hw_config[params->port].default_cfg))
+                    & PORT_HW_CFG_NET_SERDES_IF_MASK) ==
+                    PORT_HW_CFG_NET_SERDES_IF_SFI) {
+                        if (bnx2x_is_sfp_module_plugged(phy, params)) {
+                                bnx2x_sfp_tx_fault_detection(phy, params, vars);
+                        } else if (vars->link_status &
+                                LINK_STATUS_SFP_TX_FAULT) {
+                                /* Clean trail, interrupt corrects the leds */
+                                vars->link_status &= ~LINK_STATUS_SFP_TX_FAULT;
+                                vars->phy_flags &= ~PHY_SFP_TX_FAULT_FLAG;
+                                /* Update link status in the shared memory */
+                                bnx2x_update_mng(params, vars->link_status);
+                        }
+                }
+
         }
 
 }
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.h
index e920800a7bc5..cd1f2719b62d 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.h
@@ -307,6 +307,7 @@ struct link_vars {
 #define PHY_PHYSICAL_LINK_FLAG          (1<<2)
 #define PHY_HALF_OPEN_CONN_FLAG         (1<<3)
 #define PHY_OVER_CURRENT_FLAG           (1<<4)
+#define PHY_SFP_TX_FAULT_FLAG           (1<<5)
 
         u8 mac_type;
 #define MAC_TYPE_NONE           0