From 48ec52910047e048a5857fdaf00679b85a952ec5 Mon Sep 17 00:00:00 2001
From: Mugunthan V N <mugunthanvnm@ti.com>
Date: Tue, 19 Feb 2013 21:34:44 +0000
Subject: [PATCH] am335x: cpsw: optimize cpsw_send to increase network
performance
Before submitting packets to cpdma, phy status is updated on every packet
which leads to delay in packet send intern reduces the Ethernet performance.
Checking mdio status for each packet will reduce timetaken to send a packet
and there by increasing the Ethernet performance. With this the performance
is increased from 208KiB/s to 375KiB/s on EVMsk
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
---
drivers/net/cpsw.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/net/cpsw.c b/drivers/net/cpsw.c
index db04795dfc9..93f8417a4ce 100644
--- a/drivers/net/cpsw.c
+++ b/drivers/net/cpsw.c
@@ -227,6 +227,9 @@ struct cpsw_priv {
struct cpsw_slave *slaves;
struct phy_device *phydev;
struct mii_dev *bus;
+
+ u32 mdio_link;
+ u32 phy_mask;
};
static inline int cpsw_ale_get_field(u32 *ale_entry, u32 start, u32 bits)
@@ -598,10 +601,21 @@ static int cpsw_update_link(struct cpsw_priv *priv)
for_each_slave(slave, priv)
cpsw_slave_update_link(slave, priv, &link);
-
+ priv->mdio_link = readl(&mdio_regs->link);
return link;
}
+static int cpsw_check_link(struct cpsw_priv *priv)
+{
+ u32 link = 0;
+
+ link = __raw_readl(&mdio_regs->link) & priv->phy_mask;
+ if ((link) && (link == priv->mdio_link))
+ return 1;
+
+ return cpsw_update_link(priv);
+}
+
static inline u32 cpsw_get_slave_port(struct cpsw_priv *priv, u32 slave_num)
{
if (priv->host_port == 0)
@@ -631,6 +645,8 @@ static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv)
cpsw_ale_port_state(priv, slave_port, ALE_PORT_STATE_FORWARD);
cpsw_ale_add_mcast(priv, NetBcastAddr, 1 << slave_port);
+
+ priv->phy_mask |= 1 << slave->data->phy_id;
}
static struct cpdma_desc *cpdma_desc_alloc(struct cpsw_priv *priv)
@@ -862,7 +878,7 @@ static int cpsw_send(struct eth_device *dev, void *packet, int length)
int len;
int timeout = CPDMA_TIMEOUT;
- if (!cpsw_update_link(priv))
+ if (!cpsw_check_link(priv))
return -EIO;
flush_dcache_range((unsigned long)packet,
--
GitLab