netdev - [PATCH v4 4/6] net: fec: Increase buffer descriptor entry number

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Date:	Tue, 10 Jun 2014 17:32:22 +0800
From:	Fugang Duan <b38611@...escale.com>
To:	<davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <b38611@...escale.com>,
	<ezequiel.garcia@...e-electrons.com>, <b20596@...escale.com>,
	<David.Laight@...LAB.COM>, <eric.dumazet@...il.com>
Subject: [PATCH v4 4/6] net: fec: Increase buffer descriptor entry number

In order to support SG, software TSO, let's increase BD entry number.

CC: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
CC: Eric Dumazet <eric.dumazet@...il.com>
CC: David Laight <David.Laight@...LAB.COM>
Signed-off-by: Fugang Duan <B38611@...escale.com>
---
 drivers/net/ethernet/freescale/fec.h      |    4 ++--
 drivers/net/ethernet/freescale/fec_main.c |   29 +++++++++++++++--------------
 2 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index db967a0..5ffd323 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -246,8 +246,8 @@ struct bufdesc_ex {
 #define RX_RING_SIZE		(FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES)
 #define FEC_ENET_TX_FRSIZE	2048
 #define FEC_ENET_TX_FRPPG	(PAGE_SIZE / FEC_ENET_TX_FRSIZE)
-#define TX_RING_SIZE		16	/* Must be power of two */
-#define TX_RING_MOD_MASK	15	/*   for this to work */
+#define TX_RING_SIZE		512	/* Must be power of two */
+#define TX_RING_MOD_MASK	511	/*   for this to work */
 
 #define BD_ENET_RX_INT          0x00800000
 #define BD_ENET_RX_PTP          ((ushort)0x0400)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index f943cd1..b27a729 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -173,10 +173,6 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
 #endif
 #endif /* CONFIG_M5272 */
 
-#if (((RX_RING_SIZE + TX_RING_SIZE) * 32) > PAGE_SIZE)
-#error "FEC: descriptor ring size constants too large"
-#endif
-
 /* Interrupt events/masks. */
 #define FEC_ENET_HBERR	((uint)0x80000000)	/* Heartbeat error */
 #define FEC_ENET_BABR	((uint)0x40000000)	/* Babbling receiver */
@@ -2048,9 +2044,21 @@ static int fec_enet_init(struct net_device *ndev)
 	const struct platform_device_id *id_entry =
 				platform_get_device_id(fep->pdev);
 	struct bufdesc *cbd_base;
+	int bd_size;
+
+	/* init the tx & rx ring size */
+	fep->tx_ring_size = TX_RING_SIZE;
+	fep->rx_ring_size = RX_RING_SIZE;
+
+	if (fep->bufdesc_ex)
+		fep->bufdesc_size = sizeof(struct bufdesc_ex);
+	else
+		fep->bufdesc_size = sizeof(struct bufdesc);
+	bd_size = (fep->tx_ring_size + fep->rx_ring_size) *
+			fep->bufdesc_size;
 
 	/* Allocate memory for buffer descriptors. */
-	cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma,
+	cbd_base = dma_alloc_coherent(NULL, bd_size, &fep->bd_dma,
 				      GFP_KERNEL);
 	if (!cbd_base)
 		return -ENOMEM;
@@ -2064,20 +2072,13 @@ static int fec_enet_init(struct net_device *ndev)
 	/* make sure MAC we just acquired is programmed into the hw */
 	fec_set_mac_address(ndev, NULL);
 
-	/* init the tx & rx ring size */
-	fep->tx_ring_size = TX_RING_SIZE;
-	fep->rx_ring_size = RX_RING_SIZE;
-
 	/* Set receive and transmit descriptor base. */
 	fep->rx_bd_base = cbd_base;
-	if (fep->bufdesc_ex) {
+	if (fep->bufdesc_ex)
 		fep->tx_bd_base = (struct bufdesc *)
 			(((struct bufdesc_ex *)cbd_base) + fep->rx_ring_size);
-		fep->bufdesc_size = sizeof(struct bufdesc_ex);
-	} else {
+	else
 		fep->tx_bd_base = cbd_base + fep->rx_ring_size;
-		fep->bufdesc_size = sizeof(struct bufdesc);
-	}
 
 	/* The FEC Ethernet specific entries in the device structure */
 	ndev->watchdog_timeo = TX_TIMEOUT;
-- 
1.7.8

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