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Date: Wed, 9 Apr 2008 19:37:51 -0500
From: Andy Fleming <afleming@...escale.com>
To: jgarzik@...ox.com
Cc: netdev@...r.kernel.org, Dai Haruki <dai.haruki@...escale.com>,
Andy Fleming <afleming@...escale.com>
Subject: [PATCH v2.6.26] gianfar: Support NAPI for TX Frames
From: Dai Haruki <dai.haruki@...escale.com>
Poll the completed TX frames in gfar_poll(). This prevents the tx
completion interrupt from interfering with processing of received
frames.
We also disable hardware rx coalescing when NAPI is enabled.
Signed-off-by: Dai Haruki <dai.haruki@...escale.com>
Signed-off-by: Andy Fleming <afleming@...escale.com>
---
drivers/net/gianfar.c | 56 ++++++++++++++++++++++++++++++++++++------------
drivers/net/gianfar.h | 13 +++++++++-
2 files changed, 53 insertions(+), 16 deletions(-)
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 601f93e..c8c3df7 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -1250,17 +1250,12 @@ static void gfar_timeout(struct net_device *dev)
}
/* Interrupt Handler for Transmit complete */
-static irqreturn_t gfar_transmit(int irq, void *dev_id)
+int gfar_clean_tx_ring(struct net_device *dev)
{
- struct net_device *dev = (struct net_device *) dev_id;
- struct gfar_private *priv = netdev_priv(dev);
struct txbd8 *bdp;
+ struct gfar_private *priv = netdev_priv(dev);
+ int howmany = 0;
- /* Clear IEVENT */
- gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
-
- /* Lock priv */
- spin_lock(&priv->txlock);
bdp = priv->dirty_tx;
while ((bdp->status & TXBD_READY) == 0) {
/* If dirty_tx and cur_tx are the same, then either the */
@@ -1269,7 +1264,7 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
if ((bdp == priv->cur_tx) && (netif_queue_stopped(dev) == 0))
break;
- dev->stats.tx_packets++;
+ howmany++;
/* Deferred means some collisions occurred during transmit, */
/* but we eventually sent the packet. */
@@ -1278,11 +1273,15 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
/* Free the sk buffer associated with this TxBD */
dev_kfree_skb_irq(priv->tx_skbuff[priv->skb_dirtytx]);
+
priv->tx_skbuff[priv->skb_dirtytx] = NULL;
priv->skb_dirtytx =
(priv->skb_dirtytx +
1) & TX_RING_MOD_MASK(priv->tx_ring_size);
+ /* Clean BD length for empty detection */
+ bdp->length = 0;
+
/* update bdp to point at next bd in the ring (wrapping if necessary) */
if (bdp->status & TXBD_WRAP)
bdp = priv->tx_bd_base;
@@ -1297,6 +1296,25 @@ static irqreturn_t gfar_transmit(int irq, void *dev_id)
netif_wake_queue(dev);
} /* while ((bdp->status & TXBD_READY) == 0) */
+ dev->stats.tx_packets += howmany;
+
+ return howmany;
+}
+
+/* Interrupt Handler for Transmit complete */
+static irqreturn_t gfar_transmit(int irq, void *dev_id)
+{
+ struct net_device *dev = (struct net_device *) dev_id;
+ struct gfar_private *priv = netdev_priv(dev);
+
+ /* Clear IEVENT */
+ gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
+
+ /* Lock priv */
+ spin_lock(&priv->txlock);
+
+ gfar_clean_tx_ring(dev);
+
/* If we are coalescing the interrupts, reset the timer */
/* Otherwise, clear it */
if (likely(priv->txcoalescing)) {
@@ -1392,15 +1410,15 @@ irqreturn_t gfar_receive(int irq, void *dev_id)
unsigned long flags;
#endif
- /* Clear IEVENT, so rx interrupt isn't called again
- * because of this interrupt */
- gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
-
/* support NAPI */
#ifdef CONFIG_GFAR_NAPI
+ /* Clear IEVENT, so interrupts aren't called again
+ * because of the packets that have already arrived */
+ gfar_write(&priv->regs->ievent, IEVENT_RTX_MASK);
+
if (netif_rx_schedule_prep(dev, &priv->napi)) {
tempval = gfar_read(&priv->regs->imask);
- tempval &= IMASK_RX_DISABLED;
+ tempval &= IMASK_RTX_DISABLED;
gfar_write(&priv->regs->imask, tempval);
__netif_rx_schedule(dev, &priv->napi);
@@ -1411,6 +1429,9 @@ irqreturn_t gfar_receive(int irq, void *dev_id)
gfar_read(&priv->regs->imask));
}
#else
+ /* Clear IEVENT, so rx interrupt isn't called again
+ * because of this interrupt */
+ gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
spin_lock_irqsave(&priv->rxlock, flags);
gfar_clean_rx_ring(dev, priv->rx_ring_size);
@@ -1580,6 +1601,13 @@ static int gfar_poll(struct napi_struct *napi, int budget)
struct gfar_private *priv = container_of(napi, struct gfar_private, napi);
struct net_device *dev = priv->dev;
int howmany;
+ unsigned long flags;
+
+ /* If we fail to get the lock, don't bother with the TX BDs */
+ if (spin_trylock_irqsave(&priv->txlock, flags)) {
+ gfar_clean_tx_ring(dev);
+ spin_unlock_irqrestore(&priv->txlock, flags);
+ }
howmany = gfar_clean_rx_ring(dev, budget);
diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index ea8671f..0d08836 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -126,9 +126,16 @@ extern const char gfar_driver_version[];
#define DEFAULT_TXCOUNT 16
#define DEFAULT_TXTIME 21
+#define DEFAULT_RXTIME 21
+
+/* Non NAPI Case */
+#ifndef CONFIG_GFAR_NAPI
#define DEFAULT_RX_COALESCE 1
#define DEFAULT_RXCOUNT 16
-#define DEFAULT_RXTIME 21
+#else
+#define DEFAULT_RX_COALESCE 0
+#define DEFAULT_RXCOUNT 0
+#endif /* CONFIG_GFAR_NAPI */
#define TBIPA_VALUE 0x1f
#define MIIMCFG_INIT_VALUE 0x00000007
@@ -242,6 +249,7 @@ extern const char gfar_driver_version[];
#define IEVENT_PERR 0x00000001
#define IEVENT_RX_MASK (IEVENT_RXB0 | IEVENT_RXF0)
#define IEVENT_TX_MASK (IEVENT_TXB | IEVENT_TXF)
+#define IEVENT_RTX_MASK (IEVENT_RX_MASK | IEVENT_TX_MASK)
#define IEVENT_ERR_MASK \
(IEVENT_RXC | IEVENT_BSY | IEVENT_EBERR | IEVENT_MSRO | \
IEVENT_BABT | IEVENT_TXC | IEVENT_TXE | IEVENT_LC \
@@ -269,11 +277,12 @@ extern const char gfar_driver_version[];
#define IMASK_FIQ 0x00000004
#define IMASK_DPE 0x00000002
#define IMASK_PERR 0x00000001
-#define IMASK_RX_DISABLED ~(IMASK_RXFEN0 | IMASK_BSY)
#define IMASK_DEFAULT (IMASK_TXEEN | IMASK_TXFEN | IMASK_TXBEN | \
IMASK_RXFEN0 | IMASK_BSY | IMASK_EBERR | IMASK_BABR | \
IMASK_XFUN | IMASK_RXC | IMASK_BABT | IMASK_DPE \
| IMASK_PERR)
+#define IMASK_RTX_DISABLED ((~(IMASK_RXFEN0 | IMASK_TXFEN | IMASK_BSY)) \
+ & IMASK_DEFAULT)
/* Fifo management */
#define FIFO_TX_THR_MASK 0x01ff
--
1.5.4.GIT
--
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