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Message-ID: <1256825088.2148.77.camel@myhost>
Date: Thu, 29 Oct 2009 22:04:48 +0800
From: "Figo.zhang" <figo1802@...il.com>
To: Daniel Silverstone <dsilvers@...tec.co.uk>,
"David S. Miller" <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>, Ben Dooks <ben@...tec.co.uk>
Subject: [PATCH against V2]NET/KS8695: add support NAPI for Rx
Add support NAPI Rx API for KS8695NET driver.
v2, change the Rx function to NAPI.
in <KS8695X Integrated Multi-port Gateway Solution Register Description
v1.0>:
Interrupt Enable Register (offset 0xE204)
Bit29 : WAN MAC Receive Interrupt Enable
Bit16 : LAN MAC Receive Interrupt Enable
Interrupt Status Register (Offset 0xF208)
Bit29: WAN MAC Receive Status
Bit16: LAN MAC Receive Status
see arch/arm/mach-ks8695/devices.c:
ks8695_wan_resources[] and ks8695_lan_resources[]
have IORESOURCE_IRQ , it have define the RX irq,
for wan, irq = 29; for lan ,irq = 16.
so we can do this read the interrupt status:
unsigned long mask_bit = 1 << ksp->rx_irq;
status = readl(KS8695_IRQ_VA + KS8695_INTST);
In this version is against v2, some changes that adviced by Daniel
Silverstone and Ben Dooks.
Add k8695_get_rx_enable_bit() for get Rx interrupt enable/status
bit.
Signed-off-by: Figo.zhang <figo1802@...il.com>
---
drivers/net/arm/ks8695net.c | 69 ++++++++++++++++++++++++++++++++++--------
1 files changed, 56 insertions(+), 13 deletions(-)
diff --git a/drivers/net/arm/ks8695net.c b/drivers/net/arm/ks8695net.c
index ed0b0f3..b4f5994 100644
--- a/drivers/net/arm/ks8695net.c
+++ b/drivers/net/arm/ks8695net.c
@@ -41,8 +41,7 @@
#include "ks8695net.h"
#define MODULENAME "ks8695_ether"
-#define MODULEVERSION "1.01"
-
+#define MODULEVERSION "1.02"
/*
* Transmit and device reset timeout, default 5 seconds.
@@ -98,6 +97,9 @@ struct ks8695_skbuff {
#define MAX_RX_DESC 16
#define MAX_RX_DESC_MASK 0xf
+/*napi_weight have better more than rx DMA buffers*/
+#define NAPI_WEIGHT 64
+
#define MAX_RXBUF_SIZE 0x700
#define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC)
@@ -123,6 +125,7 @@ enum ks8695_dtype {
* @dev: The platform device object for this interface
* @dtype: The type of this device
* @io_regs: The ioremapped registers for this interface
+ * @napi : Add support NAPI for Rx
* @rx_irq_name: The textual name of the RX IRQ from the platform data
* @tx_irq_name: The textual name of the TX IRQ from the platform data
* @link_irq_name: The textual name of the link IRQ from the
@@ -146,6 +149,7 @@ enum ks8695_dtype {
* @rx_ring_dma: The DMA mapped equivalent of rx_ring
* @rx_buffers: The sk_buff mappings for the RX ring
* @next_rx_desc_read: The next RX descriptor to read from on IRQ
+ * @rx_lock: A lock to protect Rx irq function
* @msg_enable: The flags for which messages to emit
*/
struct ks8695_priv {
@@ -398,11 +402,30 @@ ks8695_tx_irq(int irq, void *dev_id)
}
/**
+ * ks8695_get_rx_enable_bit - Get rx interrupt enable/status bit
+ * @ksp: Private data for the KS8695 Ethernet
+ *
+ * For KS8695 document:
+ * Interrupt Enable Register (offset 0xE204)
+ * Bit29 : WAN MAC Receive Interrupt Enable
+ * Bit16 : LAN MAC Receive Interrupt Enable
+ * Interrupt Status Register (Offset 0xF208)
+ * Bit29: WAN MAC Receive Status
+ * Bit16: LAN MAC Receive Status
+ * So, this Rx interrrupt enable/status bit number is equal
+ * as Rx IRQ number.
+ */
+static inline u32 ks8695_get_rx_enable_bit(struct ks8695_priv *ksp)
+{
+ return ksp->rx_irq;
+}
+
+/**
* ks8695_rx_irq - Receive IRQ handler
* @irq: The IRQ which went off (ignored)
* @dev_id: The net_device for the interrupt
*
- * Use NAPI to receive packets.
+ * Inform NAPI that packet reception needs to be scheduled
*/
static irqreturn_t
@@ -412,7 +435,7 @@ ks8695_rx_irq(int irq, void *dev_id)
struct ks8695_priv *ksp = netdev_priv(ndev);
unsigned long status;
- unsigned long mask_bit = 1 << ksp->rx_irq;
+ unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
spin_lock(&ksp->rx_lock);
@@ -434,9 +457,15 @@ ks8695_rx_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int ks8695_rx(struct net_device *ndev, int budget)
+/**
+ * ks8695_rx - Receive packets called by NAPI poll method
+ * @ksp: Private data for the KS8695 Ethernet
+ * @budget: The max packets would be receive
+ */
+
+static int ks8695_rx(struct ks8695_priv *ksp, int budget)
{
- struct ks8695_priv *ksp = netdev_priv(ndev);
+ struct net_device *ndev = ksp->ndev;
struct sk_buff *skb;
int buff_n;
u32 flags;
@@ -526,20 +555,32 @@ rx_finished:
/* And refill the buffers */
ks8695_refill_rxbuffers(ksp);
+
+ /* Kick the RX DMA engine, in case it became
+ * suspended */
+ ks8695_writereg(ksp, KS8695_DRSC, 0);
}
return received;
}
+
+/**
+ * ks8695_poll - Receive packet by NAPI poll method
+ * @ksp: Private data for the KS8695 Ethernet
+ * @budget: The remaining number packets for network subsystem
+ *
+ * Invoked by the network core when it requests for new
+ * packets from the driver
+ */
static int ks8695_poll(struct napi_struct *napi, int budget)
{
struct ks8695_priv *ksp = container_of(napi, struct ks8695_priv, napi);
- struct net_device *dev = ksp->ndev;
- unsigned long mask_bit = 1 << ksp->rx_irq;
- unsigned long isr = readl(KS8695_IRQ_VA + KS8695_INTEN);
+ unsigned long work_done;
- unsigned long work_done ;
+ unsigned long isr = readl(KS8695_IRQ_VA + KS8695_INTEN);
+ unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
- work_done = ks8695_rx(dev, budget);
+ work_done = ks8695_rx(ksp, budget);
if (work_done < budget) {
unsigned long flags;
@@ -1302,6 +1343,7 @@ ks8695_stop(struct net_device *ndev)
struct ks8695_priv *ksp = netdev_priv(ndev);
netif_stop_queue(ndev);
+ napi_disable(&ksp->napi);
netif_carrier_off(ndev);
ks8695_shutdown(ksp);
@@ -1335,7 +1377,8 @@ ks8695_open(struct net_device *ndev)
ks8695_shutdown(ksp);
return ret;
}
-
+
+ napi_enable(&ksp->napi);
netif_start_queue(ndev);
return 0;
@@ -1521,7 +1564,7 @@ ks8695_probe(struct platform_device *pdev)
SET_ETHTOOL_OPS(ndev, &ks8695_ethtool_ops);
ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
- netif_napi_add(ndev, &ksp->napi, ks8695_poll, 64);
+ netif_napi_add(ndev, &ksp->napi, ks8695_poll, NAPI_WEIGHT);
/* Retrieve the default MAC addr from the chip. */
/* The bootloader should have left it in there for us. */
--
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