From 1fabe449dd69df3642cd898c7f5cb96d54d629bd Mon Sep 17 00:00:00 2001
From: Stefan Lankes <lankes@lfbs.rwth-aachen.de>
Date: Tue, 20 Sep 2011 13:05:49 -0700
Subject: [PATCH] minor performance improvements

=> reducing the number of interrupts
---
 drivers/net/rckemac.c | 18 ++++++++++++++----
 drivers/net/rckemac.h |  1 +
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/net/rckemac.c b/drivers/net/rckemac.c
index 6cb01ed3..07b538ad 100644
--- a/drivers/net/rckemac.c
+++ b/drivers/net/rckemac.c
@@ -349,7 +349,7 @@ static void rckemacif_input(struct netif* netif, struct pbuf* p)
 #endif /* PPPOE_SUPPORT */
 		/* 
 		 * This function is called in the context of the tcpip thread.
-		 * Therefore, we are able to call directly the input functions
+		 * Therefore, we are able to call directly the input functions.
 		 */
 		err = ethernet_input(p, netif);
 		if (err != ERR_OK) {
@@ -501,6 +501,11 @@ rxDone:
 
 	if (read_offset != write_offset)
 		goto again;
+
+	/* Enable eMAC interrupt */
+	int tmp = *((volatile int*) (FPGA_BASE + IRQ_MASK + rckemacif->core * 2 * 4));
+	*((volatile int*) (FPGA_BASE + IRQ_MASK + rckemacif->core * 2 * 4)) = tmp & ~(1 << rckemacif->num_emac);
+	rckemacif->polling = 0;
 }
 
 /* this function is called in the context of the tcpip thread */
@@ -528,8 +533,13 @@ static void rckemacif_handler(struct state* s)
 	/* check for updated write offset */
 	write_offset = *((volatile unsigned int*) (rckemacif->rx_buffer)) & 0xFFFF;
 	//write_offset = read_emac(rckemacif->num_emac, EMAC_RX_CONTROL + EMAC_RX_BUFFER_WRITE_OFFSET, rckemacif->core);
-	if ((write_offset != 0) && (rckemacif->rx_read_offset != write_offset)) {
-		if (tcpip_callback_with_block(rckemacif_poll, (void*) write_offset, 0) != ERR_OK) {
+	if ((write_offset != 0) && (rckemacif->rx_read_offset != write_offset) && !rckemacif->polling) {
+		if (tcpip_callback_with_block(rckemacif_poll, (void*) write_offset, 0) == ERR_OK) {
+			/* Maks eMAC interrupt */
+			int tmp = *((volatile int*) (FPGA_BASE + IRQ_MASK + rckemacif->core * 2 * 4));
+			*((volatile int*) (FPGA_BASE + IRQ_MASK + rckemacif->core * 2 * 4)) = tmp | (1 << rckemacif->num_emac);
+			rckemacif->polling = 1;
+		} else {
 			LWIP_DEBUGF(NETIF_DEBUG, ("rckemacif_handler: unable to send a poll request to the tcpip thread\n"));
 		}
 	}
@@ -572,7 +582,7 @@ err_t rckemacif_init(struct netif* netif)
 		LWIP_DEBUGF(NETIF_DEBUG, ("rckemacif_init: out of memory\n"));
 		return ERR_MEM;
 	}
-	memset(rckemacif, 0, sizeof(rckemacif_t));
+	memset(rckemacif, 0x00, sizeof(rckemacif_t));
 	rckemacif->core = core;
 
 	/* allocate the receive buffer */
diff --git a/drivers/net/rckemac.h b/drivers/net/rckemac.h
index 2796f14d..f6710594 100644
--- a/drivers/net/rckemac.h
+++ b/drivers/net/rckemac.h
@@ -39,6 +39,7 @@ typedef struct rckemacif {
 	void*		irq_address;
 	uint32_t	core;
 	uint32_t	num_emac;
+	volatile uint8_t polling;
 } rckemacif_t;
 
 /*