[BNX2]: speedup serdes linkup

This speeds up link-up time on 5706 SerDes if the link partner does
not autoneg, a rather common scenario in blade servers. Some blade
servers use IPMI for keyboard input and it's important to minimize
link disruptions.

The speedup is achieved by shortening the timer to (HZ / 3) during
the transient period right after initiating a SerDes autoneg. If
autoneg does not complete, parallel detect can be done sooner. After
the transient period is over, the timer goes back to its normal HZ
interval.

As suggested by Jeff Garzik, the timer initialization is moved to
bnx2_init_board() from bnx2_open().

An eeprom bit is also added to allow default forced SerDes speed for
even faster link-up time.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 12 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 635a5856102b..015ff7906601 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -806,7 +806,19 @@ bnx2_setup_serdes_phy(struct bnx2 *bp)
                 bnx2_write_phy(bp, MII_ADVERTISE, new_adv);
                 bnx2_write_phy(bp, MII_BMCR, bmcr | BMCR_ANRESTART |
                         BMCR_ANENABLE);
-                bp->serdes_an_pending = SERDES_AN_TIMEOUT / bp->timer_interval;
+                if (CHIP_NUM(bp) == CHIP_NUM_5706) {
+                        /* Speed up link-up time when the link partner
+                         * does not autonegotiate which is very common
+                         * in blade servers. Some blade servers use
+                         * IPMI for kerboard input and it's important
+                         * to minimize link disruptions. Autoneg. involves
+                         * exchanging base pages plus 3 next pages and
+                         * normally completes in about 120 msec.
+                         */
+                        bp->current_interval = SERDES_AN_TIMEOUT;
+                        bp->serdes_an_pending = 1;
+                        mod_timer(&bp->timer, jiffies + bp->current_interval);
+                }
         }
 
         return 0;
@@ -3800,6 +3812,9 @@ bnx2_timer(unsigned long data)
         struct bnx2 *bp = (struct bnx2 *) data;
         u32 msg;
 
+        if (!netif_running(bp->dev))
+                return;
+
         if (atomic_read(&bp->intr_sem) != 0)
                 goto bnx2_restart_timer;
 
@@ -3817,6 +3832,8 @@ bnx2_timer(unsigned long data)
                 else if ((bp->link_up == 0) && (bp->autoneg & AUTONEG_SPEED)) {
                         u32 bmcr;
 
+                        bp->current_interval = bp->timer_interval;
+
                         bnx2_read_phy(bp, MII_BMCR, &bmcr);
 
                         if (bmcr & BMCR_ANENABLE) {
@@ -3859,14 +3876,14 @@ bnx2_timer(unsigned long data)
 
                         }
                 }
+                else
+                        bp->current_interval = bp->timer_interval;
 
                 spin_unlock_irqrestore(&bp->phy_lock, flags);
         }
 
 bnx2_restart_timer:
-        bp->timer.expires = RUN_AT(bp->timer_interval);
-
-        add_timer(&bp->timer);
+        mod_timer(&bp->timer, jiffies + bp->current_interval);
 }
 
 /* Called with rtnl_lock */
@@ -3919,12 +3936,7 @@ bnx2_open(struct net_device *dev)
                 return rc;
         }
         
-        init_timer(&bp->timer);
-
-        bp->timer.expires = RUN_AT(bp->timer_interval);
-        bp->timer.data = (unsigned long) bp;
-        bp->timer.function = bnx2_timer;
-        add_timer(&bp->timer);
+        mod_timer(&bp->timer, jiffies + bp->current_interval);
 
         atomic_set(&bp->intr_sem, 0);
 
@@ -4485,8 +4497,9 @@ bnx2_nway_reset(struct net_device *dev)
 
                 spin_lock_irq(&bp->phy_lock);
                 if (CHIP_NUM(bp) == CHIP_NUM_5706) {
-                        bp->serdes_an_pending = SERDES_AN_TIMEOUT /
-                                bp->timer_interval;
+                        bp->current_interval = SERDES_AN_TIMEOUT;
+                        bp->serdes_an_pending = 1;
+                        mod_timer(&bp->timer, jiffies + bp->current_interval);
                 }
         }
 
@@ -5315,6 +5328,7 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
         bp->stats_ticks = 1000000 & 0xffff00;
 
         bp->timer_interval =  HZ;
+        bp->current_interval =  HZ;
 
         /* Disable WOL support if we are running on a SERDES chip. */
         if (CHIP_BOND_ID(bp) & CHIP_BOND_ID_SERDES_BIT) {
@@ -5338,6 +5352,15 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
         bp->req_line_speed = 0;
         if (bp->phy_flags & PHY_SERDES_FLAG) {
                 bp->advertising = ETHTOOL_ALL_FIBRE_SPEED | ADVERTISED_Autoneg;
+
+                reg = REG_RD_IND(bp, HOST_VIEW_SHMEM_BASE +
+                                 BNX2_PORT_HW_CFG_CONFIG);
+                reg &= BNX2_PORT_HW_CFG_CFG_DFLT_LINK_MASK;
+                if (reg == BNX2_PORT_HW_CFG_CFG_DFLT_LINK_1G) {
+                        bp->autoneg = 0;
+                        bp->req_line_speed = bp->line_speed = SPEED_1000;
+                        bp->req_duplex = DUPLEX_FULL;
+                }
         }
         else {
                 bp->advertising = ETHTOOL_ALL_COPPER_SPEED | ADVERTISED_Autoneg;
@@ -5345,6 +5368,11 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
 
         bp->req_flow_ctrl = FLOW_CTRL_RX | FLOW_CTRL_TX;
 
+        init_timer(&bp->timer);
+        bp->timer.expires = RUN_AT(bp->timer_interval);
+        bp->timer.data = (unsigned long) bp;
+        bp->timer.function = bnx2_timer;
+
         return 0;
 
 err_out_unmap: