tc35815: Improve BLEx / FDAEx handling

Clear Int_BLEx / Int_FDAEx after (not before) processing Rx interrupt.
This will reduce number of unnecessary interrupts.
Also print rx error messages only if netif_msg_rx_err() enabled.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c
index a7581632f81192e90e789824c259b8bdade985a0..62965d6665d2295c4e641a7e2075925a115da43c 100644 (file)
--- a/drivers/net/tc35815.c
+++ b/drivers/net/tc35815.c
@@ -1541,8 +1541,6 @@ static int tc35815_do_interrupt(struct net_device *dev, u32 status)
 #endif
 {
        struct tc35815_local *lp = netdev_priv(dev);
-       struct tc35815_regs __iomem *tr =
-               (struct tc35815_regs __iomem *)dev->base_addr;
        int ret = -1;
 
        /* Fatal errors... */
@@ -1552,27 +1550,26 @@ static int tc35815_do_interrupt(struct net_device *dev, u32 status)
        }
        /* recoverable errors */
        if (status & Int_IntFDAEx) {
-               /* disable FDAEx int. (until we make rooms...) */
-               tc_writel(tc_readl(&tr->Int_En) & ~Int_FDAExEn, &tr->Int_En);
-               printk(KERN_WARNING
-                      "%s: Free Descriptor Area Exhausted (%#x).\n",
-                      dev->name, status);
+               if (netif_msg_rx_err(lp))
+                       dev_warn(&dev->dev,
+                                "Free Descriptor Area Exhausted (%#x).\n",
+                                status);
                dev->stats.rx_dropped++;
                ret = 0;
        }
        if (status & Int_IntBLEx) {
-               /* disable BLEx int. (until we make rooms...) */
-               tc_writel(tc_readl(&tr->Int_En) & ~Int_BLExEn, &tr->Int_En);
-               printk(KERN_WARNING
-                      "%s: Buffer List Exhausted (%#x).\n",
-                      dev->name, status);
+               if (netif_msg_rx_err(lp))
+                       dev_warn(&dev->dev,
+                                "Buffer List Exhausted (%#x).\n",
+                                status);
                dev->stats.rx_dropped++;
                ret = 0;
        }
        if (status & Int_IntExBD) {
-               printk(KERN_WARNING
-                      "%s: Excessive Buffer Descriptiors (%#x).\n",
-                      dev->name, status);
+               if (netif_msg_rx_err(lp))
+                       dev_warn(&dev->dev,
+                                "Excessive Buffer Descriptiors (%#x).\n",
+                                status);
                dev->stats.rx_length_errors++;
                ret = 0;
        }
@@ -1631,8 +1628,12 @@ static irqreturn_t tc35815_interrupt(int irq, void *dev_id)
 
        spin_lock(&lp->lock);
        status = tc_readl(&tr->Int_Src);
-       tc_writel(status, &tr->Int_Src);        /* write to clear */
+       /* BLEx, FDAEx will be cleared later */
+       tc_writel(status & ~(Int_BLEx | Int_FDAEx),
+                 &tr->Int_Src);        /* write to clear */
        handled = tc35815_do_interrupt(dev, status);
+       if (status & (Int_BLEx | Int_FDAEx))
+               tc_writel(status & (Int_BLEx | Int_FDAEx), &tr->Int_Src);
        (void)tc_readl(&tr->Int_Src);   /* flush */
        spin_unlock(&lp->lock);
        return IRQ_RETVAL(handled >= 0);
@@ -1660,8 +1661,6 @@ tc35815_rx(struct net_device *dev)
        struct tc35815_local *lp = netdev_priv(dev);
        unsigned int fdctl;
        int i;
-       int buf_free_count = 0;
-       int fd_free_count = 0;
 #ifdef TC35815_NAPI
        int received = 0;
 #endif
@@ -1770,8 +1769,9 @@ tc35815_rx(struct net_device *dev)
                        dev->stats.rx_bytes += pkt_len;
                } else {
                        dev->stats.rx_errors++;
-                       printk(KERN_DEBUG "%s: Rx error (status %x)\n",
-                              dev->name, status & Rx_Stat_Mask);
+                       if (netif_msg_rx_err(lp))
+                               dev_info(&dev->dev, "Rx error (status %x)\n",
+                                        status & Rx_Stat_Mask);
                        /* WORKAROUND: LongErr and CRCErr means Overflow. */
                        if ((status & Rx_LongErr) && (status & Rx_CRCErr)) {
                                status &= ~(Rx_LongErr|Rx_CRCErr);
@@ -1849,7 +1849,6 @@ tc35815_rx(struct net_device *dev)
 #else
                                lp->fbl_count++;
 #endif
-                               buf_free_count++;
                        }
                }
 
@@ -1871,7 +1870,6 @@ tc35815_rx(struct net_device *dev)
 #endif
                        lp->rfd_cur->fd.FDCtl = cpu_to_le32(FD_CownsFD);
                        lp->rfd_cur++;
-                       fd_free_count++;
                }
                if (lp->rfd_cur > lp->rfd_limit)
                        lp->rfd_cur = lp->rfd_base;
@@ -1882,17 +1880,6 @@ tc35815_rx(struct net_device *dev)
 #endif
        }
 
-       /* re-enable BL/FDA Exhaust interrupts. */
-       if (fd_free_count) {
-               struct tc35815_regs __iomem *tr =
-                       (struct tc35815_regs __iomem *)dev->base_addr;
-               u32 en, en_old = tc_readl(&tr->Int_En);
-               en = en_old | Int_FDAExEn;
-               if (buf_free_count)
-                       en |= Int_BLExEn;
-               if (en != en_old)
-                       tc_writel(en, &tr->Int_En);
-       }
 #ifdef TC35815_NAPI
        return received;
 #endif
@@ -1911,9 +1898,14 @@ static int tc35815_poll(struct napi_struct *napi, int budget)
        spin_lock(&lp->lock);
        status = tc_readl(&tr->Int_Src);
        do {
-               tc_writel(status, &tr->Int_Src);        /* write to clear */
+               /* BLEx, FDAEx will be cleared later */
+               tc_writel(status & ~(Int_BLEx | Int_FDAEx),
+                         &tr->Int_Src);        /* write to clear */
 
                handled = tc35815_do_interrupt(dev, status, budget - received);
+               if (status & (Int_BLEx | Int_FDAEx))
+                       tc_writel(status & (Int_BLEx | Int_FDAEx),
+                                 &tr->Int_Src);
                if (handled >= 0) {
                        received += handled;
                        if (received >= budget)