bnx2x: link report improvements

To avoid link notification duplication

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 141 insertions, 35 deletions

diff --git a/drivers/net/bnx2x/bnx2x.h b/drivers/net/bnx2x/bnx2x.h
index 9e87417f6ec7..1a005a484bea 100644
--- a/drivers/net/bnx2x/bnx2x.h
+++ b/drivers/net/bnx2x/bnx2x.h
@@ -893,6 +893,22 @@ typedef enum {
         (&bp->def_status_blk->sp_sb.\
         index_values[HC_SP_INDEX_EQ_CONS])
 
+/* This is a data that will be used to create a link report message.
+ * We will keep the data used for the last link report in order
+ * to prevent reporting the same link parameters twice.
+ */
+struct bnx2x_link_report_data {
+        u16 line_speed;                 /* Effective line speed */
+        unsigned long link_report_flags;/* BNX2X_LINK_REPORT_XXX flags */
+};
+
+enum {
+        BNX2X_LINK_REPORT_FD,           /* Full DUPLEX */
+        BNX2X_LINK_REPORT_LINK_DOWN,
+        BNX2X_LINK_REPORT_RX_FC_ON,
+        BNX2X_LINK_REPORT_TX_FC_ON,
+};
+
 struct bnx2x {
         /* Fields used in the tx and intr/napi performance paths
          * are grouped together in the beginning of the structure
@@ -1025,6 +1041,9 @@ struct bnx2x {
 
         struct link_params      link_params;
         struct link_vars        link_vars;
+        u32                     link_cnt;
+        struct bnx2x_link_report_data last_reported_link;
+
         struct mdio_if_info     mdio;
 
         struct bnx2x_common     common;
@@ -1441,6 +1460,8 @@ struct bnx2x_func_init_params {
 #define WAIT_RAMROD_POLL        0x01
 #define WAIT_RAMROD_COMMON      0x02
 
+void bnx2x_read_mf_cfg(struct bnx2x *bp);
+
 /* dmae */
 void bnx2x_read_dmae(struct bnx2x *bp, u32 src_addr, u32 len32);
 void bnx2x_write_dmae(struct bnx2x *bp, dma_addr_t dma_addr, u32 dst_addr,
diff --git a/drivers/net/bnx2x/bnx2x_cmn.c b/drivers/net/bnx2x/bnx2x_cmn.c
index 8729061a4fd5..8853ae2a042e 100644
--- a/drivers/net/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/bnx2x/bnx2x_cmn.c
@@ -758,35 +758,119 @@ u16 bnx2x_get_mf_speed(struct bnx2x *bp)
         return line_speed;
 }
 
+/**
+ * bnx2x_fill_report_data - fill link report data to report
+ *
+ * @bp:         driver handle
+ * @data:       link state to update
+ *
+ * It uses a none-atomic bit operations because is called under the mutex.
+ */
+static inline void bnx2x_fill_report_data(struct bnx2x *bp,
+                                          struct bnx2x_link_report_data *data)
+{
+        u16 line_speed = bnx2x_get_mf_speed(bp);
+
+        memset(data, 0, sizeof(*data));
+
+        /* Fill the report data: efective line speed */
+        data->line_speed = line_speed;
+
+        /* Link is down */
+        if (!bp->link_vars.link_up || (bp->flags & MF_FUNC_DIS))
+                __set_bit(BNX2X_LINK_REPORT_LINK_DOWN,
+                          &data->link_report_flags);
+
+        /* Full DUPLEX */
+        if (bp->link_vars.duplex == DUPLEX_FULL)
+                __set_bit(BNX2X_LINK_REPORT_FD, &data->link_report_flags);
+
+        /* Rx Flow Control is ON */
+        if (bp->link_vars.flow_ctrl & BNX2X_FLOW_CTRL_RX)
+                __set_bit(BNX2X_LINK_REPORT_RX_FC_ON, &data->link_report_flags);
+
+        /* Tx Flow Control is ON */
+        if (bp->link_vars.flow_ctrl & BNX2X_FLOW_CTRL_TX)
+                __set_bit(BNX2X_LINK_REPORT_TX_FC_ON, &data->link_report_flags);
+}
+
+/**
+ * bnx2x_link_report - report link status to OS.
+ *
+ * @bp:         driver handle
+ *
+ * Calls the __bnx2x_link_report() under the same locking scheme
+ * as a link/PHY state managing code to ensure a consistent link
+ * reporting.
+ */
+
 void bnx2x_link_report(struct bnx2x *bp)
 {
-        if (bp->flags & MF_FUNC_DIS) {
-                netif_carrier_off(bp->dev);
-                netdev_err(bp->dev, "NIC Link is Down\n");
-                return;
-        }
+        bnx2x_acquire_phy_lock(bp);
+        __bnx2x_link_report(bp);
+        bnx2x_release_phy_lock(bp);
+}
 
-        if (bp->link_vars.link_up) {
-                u16 line_speed;
+/**
+ * __bnx2x_link_report - report link status to OS.
+ *
+ * @bp:         driver handle
+ *
+ * None atomic inmlementation.
+ * Should be called under the phy_lock.
+ */
+void __bnx2x_link_report(struct bnx2x *bp)
+{
+        struct bnx2x_link_report_data cur_data;
 
-                if (bp->state == BNX2X_STATE_OPEN)
-                        netif_carrier_on(bp->dev);
-                netdev_info(bp->dev, "NIC Link is Up, ");
+        /* reread mf_cfg */
+        if (!CHIP_IS_E1(bp))
+                bnx2x_read_mf_cfg(bp);
+
+        /* Read the current link report info */
+        bnx2x_fill_report_data(bp, &cur_data);
+
+        /* Don't report link down or exactly the same link status twice */
+        if (!memcmp(&cur_data, &bp->last_reported_link, sizeof(cur_data)) ||
+            (test_bit(BNX2X_LINK_REPORT_LINK_DOWN,
+                      &bp->last_reported_link.link_report_flags) &&
+             test_bit(BNX2X_LINK_REPORT_LINK_DOWN,
+                      &cur_data.link_report_flags)))
+                return;
+
+        bp->link_cnt++;
 
-                line_speed = bnx2x_get_mf_speed(bp);
+        /* We are going to report a new link parameters now -
+         * remember the current data for the next time.
+         */
+        memcpy(&bp->last_reported_link, &cur_data, sizeof(cur_data));
 
-                pr_cont("%d Mbps ", line_speed);
+        if (test_bit(BNX2X_LINK_REPORT_LINK_DOWN,
+                     &cur_data.link_report_flags)) {
+                netif_carrier_off(bp->dev);
+                netdev_err(bp->dev, "NIC Link is Down\n");
+                return;
+        } else {
+                netif_carrier_on(bp->dev);
+                netdev_info(bp->dev, "NIC Link is Up, ");
+                pr_cont("%d Mbps ", cur_data.line_speed);
 
-                if (bp->link_vars.duplex == DUPLEX_FULL)
+                if (test_and_clear_bit(BNX2X_LINK_REPORT_FD,
+                                       &cur_data.link_report_flags))
                         pr_cont("full duplex");
                 else
                         pr_cont("half duplex");
 
-                if (bp->link_vars.flow_ctrl != BNX2X_FLOW_CTRL_NONE) {
-                        if (bp->link_vars.flow_ctrl & BNX2X_FLOW_CTRL_RX) {
+                /* Handle the FC at the end so that only these flags would be
+                 * possibly set. This way we may easily check if there is no FC
+                 * enabled.
+                 */
+                if (cur_data.link_report_flags) {
+                        if (test_bit(BNX2X_LINK_REPORT_RX_FC_ON,
+                                     &cur_data.link_report_flags)) {
                                 pr_cont(", receive ");
-                                if (bp->link_vars.flow_ctrl &
-                                    BNX2X_FLOW_CTRL_TX)
+                                if (test_bit(BNX2X_LINK_REPORT_TX_FC_ON,
+                                     &cur_data.link_report_flags))
                                         pr_cont("& transmit ");
                         } else {
                                 pr_cont(", transmit ");
@@ -794,10 +878,6 @@ void bnx2x_link_report(struct bnx2x *bp)
                         pr_cont("flow control ON");
                 }
                 pr_cont("\n");
-
-        } else { /* link_down */
-                netif_carrier_off(bp->dev);
-                netdev_err(bp->dev, "NIC Link is Down\n");
         }
 }
 
@@ -1345,6 +1425,13 @@ int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
 
         bp->state = BNX2X_STATE_OPENING_WAIT4_LOAD;
 
+        /* Set the initial link reported state to link down */
+        bnx2x_acquire_phy_lock(bp);
+        memset(&bp->last_reported_link, 0, sizeof(bp->last_reported_link));
+        __set_bit(BNX2X_LINK_REPORT_LINK_DOWN,
+                &bp->last_reported_link.link_report_flags);
+        bnx2x_release_phy_lock(bp);
+
         /* must be called before memory allocation and HW init */
         bnx2x_ilt_set_info(bp);
 
diff --git a/drivers/net/bnx2x/bnx2x_cmn.h b/drivers/net/bnx2x/bnx2x_cmn.h
index 1cdab69b2a51..007f29495c2e 100644
--- a/drivers/net/bnx2x/bnx2x_cmn.h
+++ b/drivers/net/bnx2x/bnx2x_cmn.h
@@ -67,11 +67,12 @@ void bnx2x__link_status_update(struct bnx2x *bp);
  * Report link status to upper layer
  *
  * @param bp
- *
- * @return int
  */
 void bnx2x_link_report(struct bnx2x *bp);
 
+/* None-atomic version of bnx2x_link_report() */
+void __bnx2x_link_report(struct bnx2x *bp);
+
 /**
  * calculates MF speed according to current linespeed and MF
  * configuration
diff --git a/drivers/net/bnx2x/bnx2x_main.c b/drivers/net/bnx2x/bnx2x_main.c
index bfd7ac98248b..3f4ff41cd333 100644
--- a/drivers/net/bnx2x/bnx2x_main.c
+++ b/drivers/net/bnx2x/bnx2x_main.c
@@ -2036,7 +2036,7 @@ static int bnx2x_get_cmng_fns_mode(struct bnx2x *bp)
         return CMNG_FNS_NONE;
 }
 
-static void bnx2x_read_mf_cfg(struct bnx2x *bp)
+void bnx2x_read_mf_cfg(struct bnx2x *bp)
 {
         int vn, n = (CHIP_MODE_IS_4_PORT(bp) ? 2 : 1);
 
@@ -2123,7 +2123,6 @@ static inline void bnx2x_link_sync_notify(struct bnx2x *bp)
 /* This function is called upon link interrupt */
 static void bnx2x_link_attn(struct bnx2x *bp)
 {
-        u32 prev_link_status = bp->link_vars.link_status;
         /* Make sure that we are synced with the current statistics */
         bnx2x_stats_handle(bp, STATS_EVENT_STOP);
 
@@ -2168,17 +2167,15 @@ static void bnx2x_link_attn(struct bnx2x *bp)
                            "single function mode without fairness\n");
         }
 
+        __bnx2x_link_report(bp);
+
         if (IS_MF(bp))
                 bnx2x_link_sync_notify(bp);
-
-        /* indicate link status only if link status actually changed */
-        if (prev_link_status != bp->link_vars.link_status)
-                bnx2x_link_report(bp);
 }
 
 void bnx2x__link_status_update(struct bnx2x *bp)
 {
-        if ((bp->state != BNX2X_STATE_OPEN) || (bp->flags & MF_FUNC_DIS))
+        if (bp->state != BNX2X_STATE_OPEN)
                 return;
 
         bnx2x_link_status_update(&bp->link_params, &bp->link_vars);
@@ -2188,10 +2185,6 @@ void bnx2x__link_status_update(struct bnx2x *bp)
         else
                 bnx2x_stats_handle(bp, STATS_EVENT_STOP);
 
-        /* the link status update could be the result of a DCC event
-           hence re-read the shmem mf configuration */
-        bnx2x_read_mf_cfg(bp);
-
         /* indicate link status */
         bnx2x_link_report(bp);
 }
@@ -3120,10 +3113,14 @@ static inline void bnx2x_attn_int_deasserted3(struct bnx2x *bp, u32 attn)
                         if (val & DRV_STATUS_SET_MF_BW)
                                 bnx2x_set_mf_bw(bp);
 
-                        bnx2x__link_status_update(bp);
                         if ((bp->port.pmf == 0) && (val & DRV_STATUS_PMF))
                                 bnx2x_pmf_update(bp);
 
+                        /* Always call it here: bnx2x_link_report() will
+                         * prevent the link indication duplication.
+                         */
+                        bnx2x__link_status_update(bp);
+
                         if (bp->port.pmf &&
                             (val & DRV_STATUS_DCBX_NEGOTIATION_RESULTS) &&
                                 bp->dcbx_enabled > 0)