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Date: Tue, 3 Jun 2008 13:02:45 +0200
From: Lennert Buytenhek <buytenh@...tstofly.org>
To: Dale Farnsworth <dale@...nsworth.org>
Cc: netdev@...r.kernel.org
Subject: [PATCH 30/39] mv643xx_eth: add tx rate control
Add an interface for the hardware's per-port and per-subqueue
TX rate control. In this stage, this is mainly so that we can
disable the bandwidth limits during initialisation of the port.
Signed-off-by: Lennert Buytenhek <buytenh@...vell.com>
---
drivers/net/mv643xx_eth.c | 104 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 103 insertions(+), 1 deletions(-)
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index ff31cd8..24426fc 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -82,7 +82,10 @@ static char mv643xx_eth_driver_version[] = "1.0";
#define PORT_STATUS(p) (0x0444 + ((p) << 10))
#define TX_FIFO_EMPTY 0x00000400
#define TXQ_COMMAND(p) (0x0448 + ((p) << 10))
+#define TXQ_FIX_PRIO_CONF(p) (0x044c + ((p) << 10))
+#define TX_BW_RATE(p) (0x0450 + ((p) << 10))
#define TX_BW_MTU(p) (0x0458 + ((p) << 10))
+#define TX_BW_BURST(p) (0x045c + ((p) << 10))
#define INT_CAUSE(p) (0x0460 + ((p) << 10))
#define INT_RX 0x00000804
#define INT_EXT 0x00000002
@@ -98,6 +101,9 @@ static char mv643xx_eth_driver_version[] = "1.0";
#define RXQ_CURRENT_DESC_PTR(p) (0x060c + ((p) << 10))
#define RXQ_COMMAND(p) (0x0680 + ((p) << 10))
#define TXQ_CURRENT_DESC_PTR(p) (0x06c0 + ((p) << 10))
+#define TXQ_BW_TOKENS(p) (0x0700 + ((p) << 10))
+#define TXQ_BW_CONF(p) (0x0704 + ((p) << 10))
+#define TXQ_BW_WRR_CONF(p) (0x0708 + ((p) << 10))
#define MIB_COUNTERS(p) (0x1000 + ((p) << 7))
#define SPECIAL_MCAST_TABLE(p) (0x1400 + ((p) << 10))
#define OTHER_MCAST_TABLE(p) (0x1500 + ((p) << 10))
@@ -757,6 +763,95 @@ static int mv643xx_eth_xmit(struct sk_buff *skb, struct net_device *dev)
}
+/* tx rate control **********************************************************/
+/*
+ * Set total maximum TX rate (shared by all TX queues for this port)
+ * to 'rate' bits per second, with a maximum burst of 'burst' bytes.
+ */
+static void tx_set_rate(struct mv643xx_eth_private *mep, int rate, int burst)
+{
+ int token_rate;
+ int mtu;
+ int bucket_size;
+
+ token_rate = ((rate / 1000) * 64) / (mep->shared->t_clk / 1000);
+ if (token_rate > 1023)
+ token_rate = 1023;
+
+ mtu = (mep->dev->mtu + 255) >> 8;
+ if (mtu > 63)
+ mtu = 63;
+
+ bucket_size = (burst + 255) >> 8;
+ if (bucket_size > 65535)
+ bucket_size = 65535;
+
+ wrl(mep, TX_BW_RATE(mep->port_num), token_rate);
+ wrl(mep, TX_BW_MTU(mep->port_num), mtu);
+ wrl(mep, TX_BW_BURST(mep->port_num), bucket_size);
+}
+
+static void txq_set_rate(struct tx_queue *txq, int rate, int burst)
+{
+ struct mv643xx_eth_private *mep = txq_to_mep(txq);
+ int token_rate;
+ int bucket_size;
+
+ token_rate = ((rate / 1000) * 64) / (mep->shared->t_clk / 1000);
+ if (token_rate > 1023)
+ token_rate = 1023;
+
+ bucket_size = (burst + 255) >> 8;
+ if (bucket_size > 65535)
+ bucket_size = 65535;
+
+ wrl(mep, TXQ_BW_TOKENS(mep->port_num), token_rate << 14);
+ wrl(mep, TXQ_BW_CONF(mep->port_num),
+ (bucket_size << 10) | token_rate);
+}
+
+static void txq_set_fixed_prio_mode(struct tx_queue *txq)
+{
+ struct mv643xx_eth_private *mep = txq_to_mep(txq);
+ int off;
+ u32 val;
+
+ /*
+ * Turn on fixed priority mode.
+ */
+ off = TXQ_FIX_PRIO_CONF(mep->port_num);
+
+ val = rdl(mep, off);
+ val |= 1;
+ wrl(mep, off, val);
+}
+
+static void txq_set_wrr(struct tx_queue *txq, int weight)
+{
+ struct mv643xx_eth_private *mep = txq_to_mep(txq);
+ int off;
+ u32 val;
+
+ /*
+ * Turn off fixed priority mode.
+ */
+ off = TXQ_FIX_PRIO_CONF(mep->port_num);
+
+ val = rdl(mep, off);
+ val &= ~1;
+ wrl(mep, off, val);
+
+ /*
+ * Configure WRR weight for this queue.
+ */
+ off = TXQ_BW_WRR_CONF(mep->port_num);
+
+ val = rdl(mep, off);
+ val = (val & ~0xff) | (weight & 0xff);
+ wrl(mep, off, val);
+}
+
+
/* mii management interface *************************************************/
#define SMI_BUSY 0x10000000
#define SMI_READ_VALID 0x08000000
@@ -1562,7 +1657,7 @@ static void port_start(struct mv643xx_eth_private *mep)
/*
* Configure TX path and queues.
*/
- wrl(mep, TX_BW_MTU(mep->port_num), 0);
+ tx_set_rate(mep, 1000000000, 16777216);
for (i = 0; i < 1; i++) {
struct tx_queue *txq = mep->txq;
int off = TXQ_CURRENT_DESC_PTR(mep->port_num);
@@ -1571,6 +1666,9 @@ static void port_start(struct mv643xx_eth_private *mep)
addr = (u32)txq->tx_desc_dma;
addr += txq->tx_curr_desc * sizeof(struct tx_desc);
wrl(mep, off, addr);
+
+ txq_set_rate(txq, 1000000000, 16777216);
+ txq_set_fixed_prio_mode(txq);
}
/*
@@ -1730,10 +1828,14 @@ static int mv643xx_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
static int mv643xx_eth_change_mtu(struct net_device *dev, int new_mtu)
{
+ struct mv643xx_eth_private *mep = netdev_priv(dev);
+
if (new_mtu < 64 || new_mtu > 9500)
return -EINVAL;
dev->mtu = new_mtu;
+ tx_set_rate(mep, 1000000000, 16777216);
+
if (!netif_running(dev))
return 0;
--
1.5.3.4
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