From: Markus Schneider-Pargmann <msp@baylibre.com>
To: Marc Kleine-Budde <mkl@pengutronix.de>,
Chandrasekar Ramakrishnan <rcsekar@samsung.com>,
Wolfgang Grandegger <wg@grandegger.com>
Cc: Vincent MAILHOL <mailhol.vincent@wanadoo.fr>,
linux-can@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Markus Schneider-Pargmann <msp@baylibre.com>
Subject: [PATCH 08/18] can: m_can: Write transmit header and data in one transaction
Date: Wed, 21 Dec 2022 16:25:27 +0100 [thread overview]
Message-ID: <20221221152537.751564-9-msp@baylibre.com> (raw)
In-Reply-To: <20221221152537.751564-1-msp@baylibre.com>
Combine header and data before writing to the transmit fifo to reduce
the overhead for peripheral chips.
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
drivers/net/can/m_can/m_can.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index bcd3bcdc5123..9b5ad222aef7 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1657,6 +1657,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
m_can_write(cdev, M_CAN_TXBAR, 0x1);
/* End of xmit function for version 3.0.x */
} else {
+ char buf[TXB_ELEMENT_SIZE];
/* Transmit routine for version >= v3.1.x */
txfqs = m_can_read(cdev, M_CAN_TXFQS);
@@ -1696,12 +1697,11 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
fifo_header.dlc = FIELD_PREP(TX_BUF_MM_MASK, putidx) |
FIELD_PREP(TX_BUF_DLC_MASK, can_fd_len2dlc(cf->len)) |
fdflags | TX_BUF_EFC;
- err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID, &fifo_header, 2);
- if (err)
- goto out_fail;
+ memcpy(buf, &fifo_header, 8);
+ memcpy(&buf[8], &cf->data, cf->len);
- err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_DATA,
- cf->data, DIV_ROUND_UP(cf->len, 4));
+ err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID,
+ buf, 8 + DIV_ROUND_UP(cf->len, 4));
if (err)
goto out_fail;
--
2.38.1
next prev parent reply other threads:[~2022-12-21 15:26 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-21 15:25 [PATCH 00/18] can: m_can: Optimizations for m_can/tcan part 2 Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 01/18] can: tcan4x5x: Remove reserved register 0x814 from writable table Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 02/18] can: tcan4x5x: Check size of mram configuration Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 03/18] can: m_can: Remove repeated check for is_peripheral Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 04/18] can: m_can: Always acknowledge all interrupts Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 05/18] can: m_can: Remove double interrupt enable Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 06/18] can: m_can: Disable unused interrupts Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 07/18] can: m_can: Keep interrupts enabled during peripheral read Markus Schneider-Pargmann
2022-12-21 15:25 ` Markus Schneider-Pargmann [this message]
2022-12-21 15:25 ` [PATCH 09/18] can: m_can: Implement receive coalescing Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 10/18] can: m_can: Implement transmit coalescing Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 11/18] can: m_can: Add rx coalescing ethtool support Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 12/18] can: m_can: Add tx " Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 13/18] can: m_can: Cache tx putidx Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 14/18] can: m_can: Use the workqueue as queue Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 15/18] can: m_can: Introduce a tx_fifo_in_flight counter Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 16/18] can: m_can: Use tx_fifo_in_flight for netif_queue control Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 17/18] can: m_can: Implement BQL Markus Schneider-Pargmann
2022-12-21 15:25 ` [PATCH 18/18] can: m_can: Implement transmit submission coalescing Markus Schneider-Pargmann
2023-01-09 13:55 ` [PATCH 00/18] can: m_can: Optimizations for m_can/tcan part 2 Markus Schneider-Pargmann
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