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Date: Thu, 6 Aug 2009 23:41:46 +0900
From: Atsushi Nemoto <anemo@....ocn.ne.jp>
To: netdev@...r.kernel.org
Cc: David Miller <davem@...emloft.net>,
Ralf Roesch <ralf.roesch@...gmbh.de>
Subject: [PATCH 2/5] 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@....ocn.ne.jp>
---
drivers/net/tc35815.c | 60 +++++++++++++++++++++---------------------------
1 files changed, 26 insertions(+), 34 deletions(-)
diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c
index c903a68..801d201 100644
--- 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)
--
1.5.6.5
--
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