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Message-ID: <1610292623-15564-17-git-send-email-stefanc@marvell.com>
Date: Sun, 10 Jan 2021 17:30:20 +0200
From: <stefanc@...vell.com>
To: <netdev@...r.kernel.org>
CC: <thomas.petazzoni@...tlin.com>, <davem@...emloft.net>,
<nadavh@...vell.com>, <ymarkman@...vell.com>,
<linux-kernel@...r.kernel.org>, <stefanc@...vell.com>,
<kuba@...nel.org>, <linux@...linux.org.uk>, <mw@...ihalf.com>,
<andrew@...n.ch>, <rmk+kernel@...linux.org.uk>,
<atenart@...nel.org>
Subject: [PATCH RFC net-next 16/19] net: mvpp2: add PPv23 RX FIFO flow control
From: Stefan Chulski <stefanc@...vell.com>
New FIFO flow control feature were added in PPv23.
PPv2 FIFO polled by HW and trigger pause frame if FIFO
fill level is below threshold.
FIFO HW flow control enabled with CM3 RXQ&BM flow
control with ethtool.
Current FIFO thresholds is:
9KB for port with maximum speed 10Gb/s port
4KB for port with maximum speed 5Gb/s port
2KB for port with maximum speed 1Gb/s port
Signed-off-by: Stefan Chulski <stefanc@...vell.com>
---
drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 16 +++++-
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 55 ++++++++++++++++++++
2 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 27aa593..3451618 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -770,6 +770,18 @@
#define MVPP2_TX_FIFO_THRESHOLD(kb) \
((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)
+/* RX FIFO threshold in 1KB granularity */
+#define MVPP23_PORT0_FIFO_TRSH (9 * 1024)
+#define MVPP23_PORT1_FIFO_TRSH (4 * 1024)
+#define MVPP23_PORT2_FIFO_TRSH (2 * 1024)
+
+/* RX Flow Control Registers */
+#define MVPP2_RX_FC_REG(port) (0x150 + 4 * (port))
+#define MVPP2_RX_FC_EN BIT(24)
+#define MVPP2_RX_FC_TRSH_OFFS 16
+#define MVPP2_RX_FC_TRSH_MASK (0xFF << MVPP2_RX_FC_TRSH_OFFS)
+#define MVPP2_RX_FC_TRSH_UNIT 256
+
/* MSS Flow control */
#define MSS_SRAM_SIZE 0x800
#define MSS_FC_COM_REG 0
@@ -818,7 +830,6 @@
#define MSS_THRESHOLD_STOP 768
#define MSS_THRESHOLD_START 1024
-
/* RX buffer constants */
#define MVPP2_SKB_SHINFO_SIZE \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
@@ -1505,6 +1516,8 @@ struct mvpp2_bm_pool {
void mvpp2_dbgfs_cleanup(struct mvpp2 *priv);
+void mvpp23_rx_fifo_fc_en(struct mvpp2 *priv, int port, bool en);
+
#ifdef CONFIG_MVPP2_PTP
int mvpp22_tai_probe(struct device *dev, struct mvpp2 *priv);
void mvpp22_tai_tstamp(struct mvpp2_tai *tai, u32 tstamp,
@@ -1537,4 +1550,5 @@ static inline bool mvpp22_rx_hwtstamping(struct mvpp2_port *port)
{
return IS_ENABLED(CONFIG_MVPP2_PTP) && port->rx_hwtstamp;
}
+
#endif
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 8827f52..757dfe0 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -5448,6 +5448,8 @@ static int mvpp2_ethtool_set_pause_param(struct net_device *dev,
mvpp2_bm_pool_update_fc(port, port->pool_long, true);
mvpp2_bm_pool_update_fc(port, port->pool_short, true);
}
+ if (port->priv->hw_version == MVPP23)
+ mvpp23_rx_fifo_fc_en(port->priv, port->id, true);
} else if (port->priv->global_tx_fc) {
port->tx_fc = false;
@@ -5459,6 +5461,8 @@ static int mvpp2_ethtool_set_pause_param(struct net_device *dev,
mvpp2_bm_pool_update_fc(port, port->pool_long, false);
mvpp2_bm_pool_update_fc(port, port->pool_short, false);
}
+ if (port->priv->hw_version == MVPP23)
+ mvpp23_rx_fifo_fc_en(port->priv, port->id, false);
}
if (!port->phylink)
@@ -7022,6 +7026,55 @@ static void mvpp22_rx_fifo_init(struct mvpp2 *priv)
mvpp2_write(priv, MVPP2_RX_FIFO_INIT_REG, 0x1);
}
+/* Configure Rx FIFO Flow control thresholds */
+static void mvpp23_rx_fifo_fc_set_tresh(struct mvpp2 *priv)
+{
+ int port, val;
+
+ /* Port 0: maximum speed -10Gb/s port
+ * required by spec RX FIFO threshold 9KB
+ * Port 1: maximum speed -5Gb/s port
+ * required by spec RX FIFO threshold 4KB
+ * Port 2: maximum speed -1Gb/s port
+ * required by spec RX FIFO threshold 2KB
+ */
+
+ /* Without loopback port */
+ for (port = 0; port < (MVPP2_MAX_PORTS - 1); port++) {
+ if (port == 0) {
+ val = (MVPP23_PORT0_FIFO_TRSH / MVPP2_RX_FC_TRSH_UNIT)
+ << MVPP2_RX_FC_TRSH_OFFS;
+ val &= MVPP2_RX_FC_TRSH_MASK;
+ mvpp2_write(priv, MVPP2_RX_FC_REG(port), val);
+ } else if (port == 1) {
+ val = (MVPP23_PORT1_FIFO_TRSH / MVPP2_RX_FC_TRSH_UNIT)
+ << MVPP2_RX_FC_TRSH_OFFS;
+ val &= MVPP2_RX_FC_TRSH_MASK;
+ mvpp2_write(priv, MVPP2_RX_FC_REG(port), val);
+ } else {
+ val = (MVPP23_PORT2_FIFO_TRSH / MVPP2_RX_FC_TRSH_UNIT)
+ << MVPP2_RX_FC_TRSH_OFFS;
+ val &= MVPP2_RX_FC_TRSH_MASK;
+ mvpp2_write(priv, MVPP2_RX_FC_REG(port), val);
+ }
+ }
+}
+
+/* Configure Rx FIFO Flow control thresholds */
+void mvpp23_rx_fifo_fc_en(struct mvpp2 *priv, int port, bool en)
+{
+ int val;
+
+ val = mvpp2_read(priv, MVPP2_RX_FC_REG(port));
+
+ if (en)
+ val |= MVPP2_RX_FC_EN;
+ else
+ val &= ~MVPP2_RX_FC_EN;
+
+ mvpp2_write(priv, MVPP2_RX_FC_REG(port), val);
+}
+
static void mvpp22_tx_fifo_set_hw(struct mvpp2 *priv, int port, int size)
{
int threshold = MVPP2_TX_FIFO_THRESHOLD(size);
@@ -7173,6 +7226,8 @@ static int mvpp2_init(struct platform_device *pdev, struct mvpp2 *priv)
} else {
mvpp22_rx_fifo_init(priv);
mvpp22_tx_fifo_init(priv);
+ if (priv->hw_version == MVPP23)
+ mvpp23_rx_fifo_fc_set_tresh(priv);
}
if (priv->hw_version == MVPP21)
--
1.9.1
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