realtek: eth: disable tx interrupts

Ethernet transmit handling processes data synchronously via a
packet buffer. As soon as it kicks the SoC to send the packet
no more post processing is needed. Especially there is no need
for transmit completion interrupts. Disable them to reduce the
CPU load.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21778
Signed-off-by: Robert Marko <robimarko@gmail.com>

diff --git a/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c b/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
index 826dd72eba9dcc3e0e770b864446613af8658395..39bf092a8ebb30b4334182d87e9c49d6965c8572 100644 (file)
--- a/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
+++ b/target/linux/realtek/files-6.12/drivers/net/ethernet/rtl838x_eth.c
@@ -542,8 +542,8 @@ static void rtl838x_hw_en_rxtx(struct rteth_ctrl *ctrl)
        /* Truncate RX buffer to DEFAULT_MTU bytes, pad TX */
        sw_w32((DEFAULT_MTU << 16) | RX_TRUNCATE_EN_83XX | TX_PAD_EN_838X, ctrl->r->dma_if_ctrl);
 
-       /* Enable RX done, RX overflow and TX done interrupts */
-       sw_w32(0xfffff, ctrl->r->dma_if_intr_msk);
+       /* Enable RX done and RX overflow, TX done interrupts not needed */
+       sw_w32(0xffff, ctrl->r->dma_if_intr_msk);
 
        /* Enable DMA, engine expects empty FCS field */
        sw_w32_mask(0, RX_EN | TX_EN, ctrl->r->dma_if_ctrl);
@@ -566,8 +566,8 @@ static void rtl839x_hw_en_rxtx(struct rteth_ctrl *ctrl)
        /* Setup CPU-Port: RX Buffer */
        sw_w32((DEFAULT_MTU << 5) | RX_TRUNCATE_EN_83XX, ctrl->r->dma_if_ctrl);
 
-       /* Enable Notify, RX done, RX overflow and TX done interrupts */
-       sw_w32(0x007fffff, ctrl->r->dma_if_intr_msk); /* Notify IRQ! */
+       /* Enable Notify, RX done and RX overflow, TX done interrupts not needed */
+       sw_w32(0x0070ffff, ctrl->r->dma_if_intr_msk); /* Notify IRQ! */
 
        /* Enable DMA */
        sw_w32_mask(0, RX_EN | TX_EN, ctrl->r->dma_if_ctrl);
@@ -602,10 +602,10 @@ static void rtl93xx_hw_en_rxtx(struct rteth_ctrl *ctrl)
                sw_w32_mask(0x3ff << pos, v, ctrl->r->dma_if_rx_ring_cntr(i));
        }
 
-       /* Enable Notify, RX done, RX overflow and TX done interrupts */
+       /* Enable Notify, RX done and RX overflow, TX done interrupts not needed */
        sw_w32(0xffffffff, ctrl->r->dma_if_intr_rx_runout_msk);
        sw_w32(0xffffffff, ctrl->r->dma_if_intr_rx_done_msk);
-       sw_w32(0x0000000f, ctrl->r->dma_if_intr_tx_done_msk);
+       sw_w32(0x00000000, ctrl->r->dma_if_intr_tx_done_msk);
 
        /* Enable DMA */
        sw_w32_mask(0, RX_EN_93XX | TX_EN_93XX, ctrl->r->dma_if_ctrl);