pasemi_mac: Timer and interrupt fixes

Timer and interrupt fixes:

* Be pickier with what kind of interrupts are acked to avoid the device to
  get out of sync with the driver state
* Set RX count threshhold to 1 (for NAPI interrupted mode), TX count
  threshold to 32.
* Set timer thresholds to current max (~16ms).

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 30 insertions, 12 deletions

diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index 73e79f35a42..2bf13cf5535 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -526,18 +526,28 @@ static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
         struct pasemi_mac *mac = netdev_priv(dev);
         unsigned int reg;
 
-        if (!(*mac->rx_status & PAS_STATUS_INT))
+        if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
                 return IRQ_NONE;
 
-        netif_rx_schedule(dev);
-        pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
-                               PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0));
+        if (*mac->rx_status & PAS_STATUS_ERROR)
+                printk("rx_status reported error\n");
+
+        /* Don't reset packet count so it won't fire again but clear
+         * all others.
+         */
+
+        pci_read_config_dword(mac->dma_pdev, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), &reg);
 
-        reg = PAS_IOB_DMA_RXCH_RESET_PINTC | PAS_IOB_DMA_RXCH_RESET_SINTC |
-              PAS_IOB_DMA_RXCH_RESET_DINTC;
+        reg = 0;
+        if (*mac->rx_status & PAS_STATUS_SOFT)
+                reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
+        if (*mac->rx_status & PAS_STATUS_ERROR)
+                reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
         if (*mac->rx_status & PAS_STATUS_TIMER)
                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 
+        netif_rx_schedule(dev);
+
         pci_write_config_dword(mac->iob_pdev,
                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 
@@ -551,14 +561,17 @@ static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
         struct pasemi_mac *mac = netdev_priv(dev);
         unsigned int reg;
 
-        if (!(*mac->tx_status & PAS_STATUS_INT))
+        if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
                 return IRQ_NONE;
 
         pasemi_mac_clean_tx(mac);
 
-        reg = PAS_IOB_DMA_TXCH_RESET_PINTC | PAS_IOB_DMA_TXCH_RESET_SINTC;
-        if (*mac->tx_status & PAS_STATUS_TIMER)
-                reg |= PAS_IOB_DMA_TXCH_RESET_TINTC;
+        reg = PAS_IOB_DMA_TXCH_RESET_PINTC;
+
+        if (*mac->tx_status & PAS_STATUS_SOFT)
+                reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
+        if (*mac->tx_status & PAS_STATUS_ERROR)
+                reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 
         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
                                reg);
@@ -593,14 +606,18 @@ static int pasemi_mac_open(struct net_device *dev)
         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 
         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
-                               PAS_IOB_DMA_RXCH_CFG_CNTTH(30));
+                               PAS_IOB_DMA_RXCH_CFG_CNTTH(1));
+
+        pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
+                               PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
 
         /* Clear out any residual packet count state from firmware */
         pasemi_mac_restart_rx_intr(mac);
         pasemi_mac_restart_tx_intr(mac);
 
+        /* 0xffffff is max value, about 16ms */
         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
-                               PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
+                               PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 
         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 
diff --git a/drivers/net/pasemi_mac.h b/drivers/net/pasemi_mac.h
index 703f1b0d434..88edaa51c66 100644
--- a/drivers/net/pasemi_mac.h
+++ b/drivers/net/pasemi_mac.h
@@ -299,6 +299,7 @@ enum {
 #define    PAS_STATUS_DCNT_S            16
 #define    PAS_STATUS_BPCNT_M           0x0000ffff00000000ull
 #define    PAS_STATUS_BPCNT_S           32
+#define    PAS_STATUS_CAUSE_M           0xf000000000000000ull
 #define    PAS_STATUS_TIMER             0x1000000000000000ull
 #define    PAS_STATUS_ERROR             0x2000000000000000ull
 #define    PAS_STATUS_SOFT              0x4000000000000000ull