sky2: handle descriptor errors

There should never be descriptor error unless hardware or driver is buggy.
But if an error occurs, print useful information, clear irq, and recover.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 39 insertions, 31 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 98b1f3acff86..a2cc721a2bf5 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2343,26 +2343,22 @@ static void sky2_mac_intr(struct sky2_hw *hw, unsigned port)
         }
 }
 
-/* This should never happen it is a fatal situation */
-static void sky2_descriptor_error(struct sky2_hw *hw, unsigned port,
-                                  const char *rxtx, u32 mask)
+/* This should never happen it is a bug. */
+static void sky2_le_error(struct sky2_hw *hw, unsigned port,
+                          u16 q, unsigned ring_size)
 {
         struct net_device *dev = hw->dev[port];
         struct sky2_port *sky2 = netdev_priv(dev);
-        u32 imask;
-
-        printk(KERN_ERR PFX "%s: %s descriptor error (hardware problem)\n",
-               dev ? dev->name : "<not registered>", rxtx);
+        unsigned idx;
+        const u64 *le = (q == Q_R1 || q == Q_R2)
+                ? (u64 *) sky2->rx_le : (u64 *) sky2->tx_le;
 
-        imask = sky2_read32(hw, B0_IMSK);
-        imask &= ~mask;
-        sky2_write32(hw, B0_IMSK, imask);
+        idx = sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_GET_IDX));
+        printk(KERN_ERR PFX "%s: descriptor error q=%#x get=%u [%llx] put=%u\n",
+               dev->name, (unsigned) q, idx, (unsigned long long) le[idx],
+               (unsigned) sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX)));
 
-        if (dev) {
-                spin_lock(&sky2->phy_lock);
-                sky2_link_down(sky2);
-                spin_unlock(&sky2->phy_lock);
-        }
+        sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_CLR_IRQ_CHK);
 }
 
 /* If idle then force a fake soft NAPI poll once a second
@@ -2386,23 +2382,15 @@ static void sky2_idle(unsigned long arg)
         mod_timer(&hw->idle_timer, jiffies + msecs_to_jiffies(idle_timeout));
 }
 
-
-static int sky2_poll(struct net_device *dev0, int *budget)
+/* Hardware/software error handling */
+static void sky2_err_intr(struct sky2_hw *hw, u32 status)
 {
-        struct sky2_hw *hw = ((struct sky2_port *) netdev_priv(dev0))->hw;
-        int work_limit = min(dev0->quota, *budget);
-        int work_done = 0;
-        u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
+        if (net_ratelimit())
+                dev_warn(&hw->pdev->dev, "error interrupt status=%#x\n", status);
 
         if (status & Y2_IS_HW_ERR)
                 sky2_hw_intr(hw);
 
-        if (status & Y2_IS_IRQ_PHY1)
-                sky2_phy_intr(hw, 0);
-
-        if (status & Y2_IS_IRQ_PHY2)
-                sky2_phy_intr(hw, 1);
-
         if (status & Y2_IS_IRQ_MAC1)
                 sky2_mac_intr(hw, 0);
 
@@ -2410,16 +2398,33 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                 sky2_mac_intr(hw, 1);
 
         if (status & Y2_IS_CHK_RX1)
-                sky2_descriptor_error(hw, 0, "receive", Y2_IS_CHK_RX1);
+                sky2_le_error(hw, 0, Q_R1, RX_LE_SIZE);
 
         if (status & Y2_IS_CHK_RX2)
-                sky2_descriptor_error(hw, 1, "receive", Y2_IS_CHK_RX2);
+                sky2_le_error(hw, 1, Q_R2, RX_LE_SIZE);
 
         if (status & Y2_IS_CHK_TXA1)
-                sky2_descriptor_error(hw, 0, "transmit", Y2_IS_CHK_TXA1);
+                sky2_le_error(hw, 0, Q_XA1, TX_RING_SIZE);
 
         if (status & Y2_IS_CHK_TXA2)
-                sky2_descriptor_error(hw, 1, "transmit", Y2_IS_CHK_TXA2);
+                sky2_le_error(hw, 1, Q_XA2, TX_RING_SIZE);
+}
+
+static int sky2_poll(struct net_device *dev0, int *budget)
+{
+        struct sky2_hw *hw = ((struct sky2_port *) netdev_priv(dev0))->hw;
+        int work_limit = min(dev0->quota, *budget);
+        int work_done = 0;
+        u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
+
+        if (unlikely(status & Y2_IS_ERROR))
+                sky2_err_intr(hw, status);
+
+        if (status & Y2_IS_IRQ_PHY1)
+                sky2_phy_intr(hw, 0);
+
+        if (status & Y2_IS_IRQ_PHY2)
+                sky2_phy_intr(hw, 1);
 
         work_done = sky2_status_intr(hw, work_limit);
         if (work_done < work_limit) {
diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index ac24bdc42976..9ca4a2c061c6 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -288,6 +288,9 @@ enum {
                           | Y2_IS_CHK_TXA1 | Y2_IS_CHK_RX1,
         Y2_IS_PORT_2    = Y2_IS_IRQ_PHY2 | Y2_IS_IRQ_MAC2
                           | Y2_IS_CHK_TXA2 | Y2_IS_CHK_RX2,
+        Y2_IS_ERROR     = Y2_IS_HW_ERR |
+                          Y2_IS_IRQ_MAC1 | Y2_IS_CHK_TXA1 | Y2_IS_CHK_RX1 |
+                          Y2_IS_IRQ_MAC2 | Y2_IS_CHK_TXA2 | Y2_IS_CHK_RX2,
 };
 
 /*      B2_IRQM_HWE_MSK 32 bit  IRQ Moderation HW Error Mask */