diff mbox series

[v13,net-next,07/15] net: mvpp2: add FCA periodic timer configurations

Message ID 1613040542-16500-8-git-send-email-stefanc@marvell.com (mailing list archive)
State New, archived
Headers show
Series net: mvpp2: Add TX Flow Control support | expand

Commit Message

Stefan Chulski Feb. 11, 2021, 10:48 a.m. UTC 
From: Stefan Chulski <stefanc@marvell.com>

Flow Control periodic timer would be used if port in
XOFF to transmit periodic XOFF frames.

Signed-off-by: Stefan Chulski <stefanc@marvell.com>
Acked-by: Marcin Wojtas <mw@semihalf.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h      | 13 ++++++
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 45 ++++++++++++++++++++
 2 files changed, 58 insertions(+)

Comments

Russell King (Oracle) Feb. 11, 2021, 12:47 p.m. UTC | #1 
On Thu, Feb 11, 2021 at 12:48:54PM +0200, stefanc@marvell.com wrote:
> @@ -751,6 +760,10 @@
>  #define MVPP2_TX_FIFO_THRESHOLD(kb)	\
>  		((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)
>  
> +/* MSS Flow control */
> +#define FC_QUANTA		0xFFFF
> +#define FC_CLK_DIVIDER		100

You later change the number of tabs for these definitions in a later
patch. Would it be better to start having the correct number of tabs?

> +
>  /* RX buffer constants */
>  #define MVPP2_SKB_SHINFO_SIZE \
>  	SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index 5730900..761f745 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -1280,6 +1280,49 @@ static void mvpp22_gop_init_10gkr(struct mvpp2_port *port)
>  	writel(val, mpcs + MVPP22_MPCS_CLK_RESET);
>  }
>  
> +static void mvpp22_gop_fca_enable_periodic(struct mvpp2_port *port, bool en)
> +{
> +	struct mvpp2 *priv = port->priv;
> +	void __iomem *fca = priv->iface_base + MVPP22_FCA_BASE(port->gop_id);
> +	u32 val;

net likes to have reverse christmas tree variables. I think you should
clean this up. However...

> +
> +	val = readl(fca + MVPP22_FCA_CONTROL_REG);
> +	val &= ~MVPP22_FCA_ENABLE_PERIODIC;
> +	if (en)
> +		val |= MVPP22_FCA_ENABLE_PERIODIC;
> +	writel(val, fca + MVPP22_FCA_CONTROL_REG);

	if (en)
		val = MVPP22_FCA_ENABLE_PERIODIC;
	else
		val = 0;

	mvpp2_modify(priv->iface_base + MVPP22_FCA_BASE(port->gop_id) +
		     MVPP22_FCA_CONTROL_REG, MVPP22_FCA_ENABLE_PERIODIC, val);

avoids the need for "fca".

> +}
> +
> +static void mvpp22_gop_fca_set_timer(struct mvpp2_port *port, u32 timer)
> +{
> +	struct mvpp2 *priv = port->priv;
> +	void __iomem *fca = priv->iface_base + MVPP22_FCA_BASE(port->gop_id);
> +	u32 lsb, msb;

Same reverse christmas tree issue here.
diff mbox series

Patch

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index e7bbf0a..9239d80 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -596,6 +596,15 @@ 
 #define     MVPP22_MPCS_CLK_RESET_DIV_RATIO(n)	((n) << 4)
 #define     MVPP22_MPCS_CLK_RESET_DIV_SET	BIT(11)
 
+/* FCA registers. PPv2.2 and PPv2.3 */
+#define MVPP22_FCA_BASE(port)			(0x7600 + (port) * 0x1000)
+#define MVPP22_FCA_REG_SIZE			16
+#define MVPP22_FCA_REG_MASK			0xFFFF
+#define MVPP22_FCA_CONTROL_REG			0x0
+#define MVPP22_FCA_ENABLE_PERIODIC		BIT(11)
+#define MVPP22_PERIODIC_COUNTER_LSB_REG		(0x110)
+#define MVPP22_PERIODIC_COUNTER_MSB_REG		(0x114)
+
 /* XPCS registers. PPv2.2 and PPv2.3 */
 #define MVPP22_XPCS_BASE(port)			(0x7400 + (port) * 0x1000)
 #define MVPP22_XPCS_CFG0			0x0
@@ -751,6 +760,10 @@ 
 #define MVPP2_TX_FIFO_THRESHOLD(kb)	\
 		((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)
 
+/* MSS Flow control */
+#define FC_QUANTA		0xFFFF
+#define FC_CLK_DIVIDER		100
+
 /* RX buffer constants */
 #define MVPP2_SKB_SHINFO_SIZE \
 	SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 5730900..761f745 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1280,6 +1280,49 @@  static void mvpp22_gop_init_10gkr(struct mvpp2_port *port)
 	writel(val, mpcs + MVPP22_MPCS_CLK_RESET);
 }
 
+static void mvpp22_gop_fca_enable_periodic(struct mvpp2_port *port, bool en)
+{
+	struct mvpp2 *priv = port->priv;
+	void __iomem *fca = priv->iface_base + MVPP22_FCA_BASE(port->gop_id);
+	u32 val;
+
+	val = readl(fca + MVPP22_FCA_CONTROL_REG);
+	val &= ~MVPP22_FCA_ENABLE_PERIODIC;
+	if (en)
+		val |= MVPP22_FCA_ENABLE_PERIODIC;
+	writel(val, fca + MVPP22_FCA_CONTROL_REG);
+}
+
+static void mvpp22_gop_fca_set_timer(struct mvpp2_port *port, u32 timer)
+{
+	struct mvpp2 *priv = port->priv;
+	void __iomem *fca = priv->iface_base + MVPP22_FCA_BASE(port->gop_id);
+	u32 lsb, msb;
+
+	lsb = timer & MVPP22_FCA_REG_MASK;
+	msb = timer >> MVPP22_FCA_REG_SIZE;
+
+	writel(lsb, fca + MVPP22_PERIODIC_COUNTER_LSB_REG);
+	writel(msb, fca + MVPP22_PERIODIC_COUNTER_MSB_REG);
+}
+
+/* Set Flow Control timer x100 faster than pause quanta to ensure that link
+ * partner won't send traffic if port is in XOFF mode.
+ */
+static void mvpp22_gop_fca_set_periodic_timer(struct mvpp2_port *port)
+{
+	u32 timer;
+
+	timer = (port->priv->tclk / (USEC_PER_SEC * FC_CLK_DIVIDER))
+		* FC_QUANTA;
+
+	mvpp22_gop_fca_enable_periodic(port, false);
+
+	mvpp22_gop_fca_set_timer(port, timer);
+
+	mvpp22_gop_fca_enable_periodic(port, true);
+}
+
 static int mvpp22_gop_init(struct mvpp2_port *port)
 {
 	struct mvpp2 *priv = port->priv;
@@ -1324,6 +1367,8 @@  static int mvpp22_gop_init(struct mvpp2_port *port)
 	val |= GENCONF_SOFT_RESET1_GOP;
 	regmap_write(priv->sysctrl_base, GENCONF_SOFT_RESET1, val);
 
+	mvpp22_gop_fca_set_periodic_timer(port);
+
 unsupported_conf:
 	return 0;