tg3: Fix firmware event timeouts

patch 4ba526ced990f4d61ee8d65fe8a6f0745e8e455c upstream

The git commit 7c5026aa9b81dd45df8d3f4e0be73e485976a8b6 ("tg3: Add
link state reporting to UMP firmware") introduced code that waits for
previous firmware events to be serviced before attempting to submit a
new event.  Unfortunately that patch contained a bug that cause the
driver to wait 2.5 seconds, rather than 2.5 milliseconds as intended.
This patch fixes that bug.

This bug revealed that not all firmware versions service driver events
though.  Since we do not know which versions of the firmware do and don't
service these events, the driver needs some way to minimize the effects
of the delay.  This patch solves the problem by recording a jiffies
timestamp when it submits an event to the hardware.  If the jiffies
counter shows that 2.5 milliseconds have already passed, a wait is not
needed and the driver can proceed to submit a new event.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index cc4bde8525421e614c90a49acd60ef8bed66f30c..1710e4907072caec6db518c33b6c0674668b6793 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -1671,16 +1671,44 @@ static int tg3_set_power_state(struct tg3 *tp, pci_power_t state)
        return 0;
 }
 
+/* tp->lock is held. */
+static inline void tg3_generate_fw_event(struct tg3 *tp)
+{
+       u32 val;
+
+       val = tr32(GRC_RX_CPU_EVENT);
+       val |= GRC_RX_CPU_DRIVER_EVENT;
+       tw32_f(GRC_RX_CPU_EVENT, val);
+
+       tp->last_event_jiffies = jiffies;
+}
+
+#define TG3_FW_EVENT_TIMEOUT_USEC 2500
+
 /* tp->lock is held. */
 static void tg3_wait_for_event_ack(struct tg3 *tp)
 {
        int i;
+       unsigned int delay_cnt;
+       long time_remain;
+
+       /* If enough time has passed, no wait is necessary. */
+       time_remain = (long)(tp->last_event_jiffies + 1 +
+                     usecs_to_jiffies(TG3_FW_EVENT_TIMEOUT_USEC)) -
+                     (long)jiffies;
+       if (time_remain < 0)
+               return;
 
-       /* Wait for up to 2.5 milliseconds */
-       for (i = 0; i < 250000; i++) {
+       /* Check if we can shorten the wait time. */
+       delay_cnt = jiffies_to_usecs(time_remain);
+       if (delay_cnt > TG3_FW_EVENT_TIMEOUT_USEC)
+               delay_cnt = TG3_FW_EVENT_TIMEOUT_USEC;
+       delay_cnt = (delay_cnt >> 3) + 1;
+
+       for (i = 0; i < delay_cnt; i++) {
                if (!(tr32(GRC_RX_CPU_EVENT) & GRC_RX_CPU_DRIVER_EVENT))
                        break;
-               udelay(10);
+               udelay(8);
        }
 }
 
@@ -1729,9 +1757,7 @@ static void tg3_ump_link_report(struct tg3 *tp)
                val = 0;
        tg3_write_mem(tp, NIC_SRAM_FW_CMD_DATA_MBOX + 12, val);
 
-       val = tr32(GRC_RX_CPU_EVENT);
-       val |= GRC_RX_CPU_DRIVER_EVENT;
-       tw32_f(GRC_RX_CPU_EVENT, val);
+       tg3_generate_fw_event(tp);
 }
 
 static void tg3_link_report(struct tg3 *tp)
@@ -5565,6 +5591,7 @@ static int tg3_chip_reset(struct tg3 *tp)
                tg3_read_mem(tp, NIC_SRAM_DATA_CFG, &nic_cfg);
                if (nic_cfg & NIC_SRAM_DATA_CFG_ASF_ENABLE) {
                        tp->tg3_flags |= TG3_FLAG_ENABLE_ASF;
+                       tp->last_event_jiffies = jiffies;
                        if (tp->tg3_flags2 & TG3_FLG2_5750_PLUS)
                                tp->tg3_flags2 |= TG3_FLG2_ASF_NEW_HANDSHAKE;
                }
@@ -5578,15 +5605,12 @@ static void tg3_stop_fw(struct tg3 *tp)
 {
        if ((tp->tg3_flags & TG3_FLAG_ENABLE_ASF) &&
           !(tp->tg3_flags3 & TG3_FLG3_ENABLE_APE)) {
-               u32 val;
-
                /* Wait for RX cpu to ACK the previous event. */
                tg3_wait_for_event_ack(tp);
 
                tg3_write_mem(tp, NIC_SRAM_FW_CMD_MBOX, FWCMD_NICDRV_PAUSE_FW);
-               val = tr32(GRC_RX_CPU_EVENT);
-               val |= GRC_RX_CPU_DRIVER_EVENT;
-               tw32(GRC_RX_CPU_EVENT, val);
+
+               tg3_generate_fw_event(tp);
 
                /* Wait for RX cpu to ACK this event. */
                tg3_wait_for_event_ack(tp);
@@ -7477,8 +7501,6 @@ static void tg3_timer(unsigned long __opaque)
         */
        if (!--tp->asf_counter) {
                if (tp->tg3_flags & TG3_FLAG_ENABLE_ASF) {
-                       u32 val;
-
                        tg3_wait_for_event_ack(tp);
 
                        tg3_write_mem(tp, NIC_SRAM_FW_CMD_MBOX,
@@ -7486,9 +7508,8 @@ static void tg3_timer(unsigned long __opaque)
                        tg3_write_mem(tp, NIC_SRAM_FW_CMD_LEN_MBOX, 4);
                        /* 5 seconds timeout */
                        tg3_write_mem(tp, NIC_SRAM_FW_CMD_DATA_MBOX, 5);
-                       val = tr32(GRC_RX_CPU_EVENT);
-                       val |= GRC_RX_CPU_DRIVER_EVENT;
-                       tw32_f(GRC_RX_CPU_EVENT, val);
+
+                       tg3_generate_fw_event(tp);
                }
                tp->asf_counter = tp->asf_multiplier;
        }

diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 0404f93baa290c77a7b39c55754ccd23ace126fa..d68b579dfedbe3241d56181ea90fa533509c3c31 100644 (file)
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2404,7 +2404,10 @@ struct tg3 {
        struct tg3_ethtool_stats        estats;
        struct tg3_ethtool_stats        estats_prev;
 
+       union {
        unsigned long                   phy_crc_errors;
+       unsigned long                   last_event_jiffies;
+       };
 
        u32                             rx_offset;
        u32                             tg3_flags;