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Message-Id: <20230315110546.2518305-16-msp@baylibre.com>
Date: Wed, 15 Mar 2023 12:05:45 +0100
From: Markus Schneider-Pargmann <msp@...libre.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>,
Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
Wolfgang Grandegger <wg@...ndegger.com>
Cc: Vincent MAILHOL <mailhol.vincent@...adoo.fr>,
Simon Horman <simon.horman@...igine.com>,
linux-can@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Markus Schneider-Pargmann <msp@...libre.com>
Subject: [PATCH v3 15/16] can: m_can: Implement BQL
Implement byte queue limiting in preparation for the use of xmit_more().
Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
---
drivers/net/can/m_can/m_can.c | 49 +++++++++++++++++++++++++----------
1 file changed, 35 insertions(+), 14 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 3cb3d01e1a61..63d6e95717e3 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -445,6 +445,8 @@ static void m_can_clean(struct net_device *net)
for (int i = 0; i != cdev->can.echo_skb_max; ++i)
can_free_echo_skb(cdev->net, i, NULL);
+ netdev_reset_queue(cdev->net);
+
spin_lock_irqsave(&cdev->tx_handling_spinlock, irqflags);
cdev->tx_fifo_in_flight = 0;
spin_unlock_irqrestore(&cdev->tx_handling_spinlock, irqflags);
@@ -999,29 +1001,34 @@ static int m_can_poll(struct napi_struct *napi, int quota)
* echo. timestamp is used for peripherals to ensure correct ordering
* by rx-offload, and is ignored for non-peripherals.
*/
-static void m_can_tx_update_stats(struct m_can_classdev *cdev,
- unsigned int msg_mark,
- u32 timestamp)
+static unsigned int m_can_tx_update_stats(struct m_can_classdev *cdev,
+ unsigned int msg_mark, u32 timestamp)
{
struct net_device *dev = cdev->net;
struct net_device_stats *stats = &dev->stats;
+ unsigned int frame_len;
if (cdev->is_peripheral)
stats->tx_bytes +=
can_rx_offload_get_echo_skb(&cdev->offload,
msg_mark,
timestamp,
- NULL);
+ &frame_len);
else
- stats->tx_bytes += can_get_echo_skb(dev, msg_mark, NULL);
+ stats->tx_bytes += can_get_echo_skb(dev, msg_mark, &frame_len);
stats->tx_packets++;
+
+ return frame_len;
}
-static void m_can_finish_tx(struct m_can_classdev *cdev, int transmitted)
+static void m_can_finish_tx(struct m_can_classdev *cdev, int transmitted,
+ int transmitted_frame_len)
{
unsigned long irqflags;
+ netdev_completed_queue(cdev->net, transmitted, transmitted_frame_len);
+
spin_lock_irqsave(&cdev->tx_handling_spinlock, irqflags);
if (cdev->tx_fifo_in_flight >= cdev->tx_fifo_size && transmitted > 0)
netif_wake_queue(cdev->net);
@@ -1060,6 +1067,7 @@ static int m_can_echo_tx_event(struct net_device *dev)
int err = 0;
unsigned int msg_mark;
int processed = 0;
+ int processed_frame_len = 0;
struct m_can_classdev *cdev = netdev_priv(dev);
@@ -1088,7 +1096,9 @@ static int m_can_echo_tx_event(struct net_device *dev)
fgi = (++fgi >= cdev->mcfg[MRAM_TXE].num ? 0 : fgi);
/* update stats */
- m_can_tx_update_stats(cdev, msg_mark, timestamp);
+ processed_frame_len += m_can_tx_update_stats(cdev, msg_mark,
+ timestamp);
+
++processed;
}
@@ -1096,7 +1106,7 @@ static int m_can_echo_tx_event(struct net_device *dev)
m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,
ack_fgi));
- m_can_finish_tx(cdev, processed);
+ m_can_finish_tx(cdev, processed, processed_frame_len);
return err;
}
@@ -1187,11 +1197,12 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
if (ir & IR_TC) {
/* Transmission Complete Interrupt*/
u32 timestamp = 0;
+ unsigned int frame_len;
if (cdev->is_peripheral)
timestamp = m_can_get_timestamp(cdev);
- m_can_tx_update_stats(cdev, 0, timestamp);
- m_can_finish_tx(cdev, 1);
+ frame_len = m_can_tx_update_stats(cdev, 0, timestamp);
+ m_can_finish_tx(cdev, 1, frame_len);
}
} else {
if (ir & (IR_TEFN | IR_TEFW)) {
@@ -1720,6 +1731,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev,
u32 cccr, fdflags;
int err;
int putidx;
+ unsigned int frame_len = can_skb_get_frame_len(skb);
/* Generate ID field for TX buffer Element */
/* Common to all supported M_CAN versions */
@@ -1765,7 +1777,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev,
}
m_can_write(cdev, M_CAN_TXBTIE, 0x1);
- can_put_echo_skb(skb, dev, 0, 0);
+ can_put_echo_skb(skb, dev, 0, frame_len);
m_can_write(cdev, M_CAN_TXBAR, 0x1);
/* End of xmit function for version 3.0.x */
@@ -1804,7 +1816,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev,
/* Push loopback echo.
* Will be looped back on TX interrupt based on message marker
*/
- can_put_echo_skb(skb, dev, putidx, 0);
+ can_put_echo_skb(skb, dev, putidx, frame_len);
/* Enable TX FIFO element to start transfer */
m_can_write(cdev, M_CAN_TXBAR, (1 << putidx));
@@ -1875,14 +1887,23 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct m_can_classdev *cdev = netdev_priv(dev);
+ netdev_tx_t ret;
+ unsigned int frame_len;
if (can_dev_dropped_skb(dev, skb))
return NETDEV_TX_OK;
+ frame_len = can_skb_get_frame_len(skb);
+
if (cdev->is_peripheral)
- return m_can_start_peripheral_xmit(cdev, skb);
+ ret = m_can_start_peripheral_xmit(cdev, skb);
else
- return m_can_start_fast_xmit(cdev, skb);
+ ret = m_can_start_fast_xmit(cdev, skb);
+
+ if (ret == NETDEV_TX_OK)
+ netdev_sent_queue(dev, frame_len);
+
+ return ret;
}
static int m_can_open(struct net_device *dev)
--
2.39.2
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