bnx2x: Changing the Disabled state to a flag

When working with DCC, a function can be disabled or enabled (virtual link down
or up). Using the function state introduced some race conditions with the
load/unload flow.
Using a separate flag to indicate that the function is disabled.

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

2 files changed, 20 insertions, 16 deletions

diff --git a/drivers/net/bnx2x.h b/drivers/net/bnx2x.h
index 60fa14f31d73..185a6bab2227 100644
--- a/drivers/net/bnx2x.h
+++ b/drivers/net/bnx2x.h
@@ -900,6 +900,7 @@ struct bnx2x {
 #define BP_NOMCP(bp)                    (bp->flags & NO_MCP_FLAG)
 #define HW_VLAN_TX_FLAG                 0x400
 #define HW_VLAN_RX_FLAG                 0x800
+#define MF_FUNC_DIS                     0x1000
 
         int                     func;
 #define BP_PORT(bp)                     (bp->func % PORT_MAX)
@@ -965,7 +966,6 @@ struct bnx2x {
 #define BNX2X_STATE_CLOSING_WAIT4_HALT  0x4000
 #define BNX2X_STATE_CLOSING_WAIT4_DELETE 0x5000
 #define BNX2X_STATE_CLOSING_WAIT4_UNLOAD 0x6000
-#define BNX2X_STATE_DISABLED            0xd000
 #define BNX2X_STATE_DIAG                0xe000
 #define BNX2X_STATE_ERROR               0xf000
 
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index 691cf1541892..e7b3b27d16b6 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -1043,7 +1043,6 @@ static void bnx2x_sp_event(struct bnx2x_fastpath *fp,
                 break;
 
         case (RAMROD_CMD_ID_ETH_SET_MAC | BNX2X_STATE_CLOSING_WAIT4_HALT):
-        case (RAMROD_CMD_ID_ETH_SET_MAC | BNX2X_STATE_DISABLED):
                 DP(NETIF_MSG_IFDOWN, "got (un)set mac ramrod\n");
                 bp->set_mac_pending--;
                 smp_wmb();
@@ -2157,7 +2156,7 @@ static void bnx2x_calc_fc_adv(struct bnx2x *bp)
 
 static void bnx2x_link_report(struct bnx2x *bp)
 {
-        if (bp->state == BNX2X_STATE_DISABLED) {
+        if (bp->flags & MF_FUNC_DIS) {
                 netif_carrier_off(bp->dev);
                 printk(KERN_ERR PFX "%s NIC Link is Down\n", bp->dev->name);
                 return;
@@ -2437,8 +2436,7 @@ static void bnx2x_link_attn(struct bnx2x *bp)
                         memset(&(pstats->mac_stx[0]), 0,
                                sizeof(struct mac_stx));
                 }
-                if ((bp->state == BNX2X_STATE_OPEN) ||
-                    (bp->state == BNX2X_STATE_DISABLED))
+                if (bp->state == BNX2X_STATE_OPEN)
                         bnx2x_stats_handle(bp, STATS_EVENT_LINK_UP);
         }
 
@@ -2481,9 +2479,7 @@ static void bnx2x_link_attn(struct bnx2x *bp)
 
 static void bnx2x__link_status_update(struct bnx2x *bp)
 {
-        int func = BP_FUNC(bp);
-
-        if (bp->state != BNX2X_STATE_OPEN)
+        if ((bp->state != BNX2X_STATE_OPEN) || (bp->flags & MF_FUNC_DIS))
                 return;
 
         bnx2x_link_status_update(&bp->link_params, &bp->link_vars);
@@ -2640,14 +2636,19 @@ static void bnx2x_dcc_event(struct bnx2x *bp, u32 dcc_event)
 
         if (dcc_event & DRV_STATUS_DCC_DISABLE_ENABLE_PF) {
 
+                /*
+                 * This is the only place besides the function initialization
+                 * where the bp->flags can change so it is done without any
+                 * locks
+                 */
                 if (bp->mf_config & FUNC_MF_CFG_FUNC_DISABLED) {
                         DP(NETIF_MSG_IFDOWN, "mf_cfg function disabled\n");
-                        bp->state = BNX2X_STATE_DISABLED;
+                        bp->flags |= MF_FUNC_DIS;
 
                         bnx2x_e1h_disable(bp);
                 } else {
                         DP(NETIF_MSG_IFUP, "mf_cfg function enabled\n");
-                        bp->state = BNX2X_STATE_OPEN;
+                        bp->flags &= ~MF_FUNC_DIS;
 
                         bnx2x_e1h_enable(bp);
                 }
@@ -4695,8 +4696,7 @@ static void bnx2x_timer(unsigned long data)
                 }
         }
 
-        if ((bp->state == BNX2X_STATE_OPEN) ||
-            (bp->state == BNX2X_STATE_DISABLED))
+        if (bp->state == BNX2X_STATE_OPEN)
                 bnx2x_stats_handle(bp, STATS_EVENT_UPDATE);
 
 timer_restart:
@@ -7629,7 +7629,7 @@ static int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
         if (CHIP_IS_E1H(bp))
                 if (bp->mf_config & FUNC_MF_CFG_FUNC_DISABLED) {
                         DP(NETIF_MSG_IFUP, "mf_cfg function disabled\n");
-                        bp->state = BNX2X_STATE_DISABLED;
+                        bp->flags |= MF_FUNC_DIS;
                 }
 
         if (bp->state == BNX2X_STATE_OPEN) {
@@ -9034,7 +9034,9 @@ static int bnx2x_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
         cmd->supported = bp->port.supported;
         cmd->advertising = bp->port.advertising;
 
-        if (netif_carrier_ok(dev)) {
+        if ((bp->state == BNX2X_STATE_OPEN) &&
+            !(bp->flags & MF_FUNC_DIS) &&
+            (bp->link_vars.link_up)) {
                 cmd->speed = bp->link_vars.line_speed;
                 cmd->duplex = bp->link_vars.duplex;
                 if (IS_E1HMF(bp)) {
@@ -9433,6 +9435,9 @@ static u32 bnx2x_get_link(struct net_device *dev)
 {
         struct bnx2x *bp = netdev_priv(dev);
 
+        if (bp->flags & MF_FUNC_DIS)
+                return 0;
+
         return bp->link_vars.link_up;
 }
 
@@ -9837,8 +9842,7 @@ static int bnx2x_set_eeprom(struct net_device *dev,
 
         } else if (eeprom->magic == 0x50485952) {
                 /* 'PHYR' (0x50485952): re-init link after FW upgrade */
-                if ((bp->state == BNX2X_STATE_OPEN) ||
-                    (bp->state == BNX2X_STATE_DISABLED)) {
+                if (bp->state == BNX2X_STATE_OPEN) {
                         bnx2x_acquire_phy_lock(bp);
                         rc |= bnx2x_link_reset(&bp->link_params,
                                                &bp->link_vars, 1);