72 lines
3.1 KiB
Diff
72 lines
3.1 KiB
Diff
From: Vittorio Gambaletta <openwrt@vittgam.net>
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Date: Sat, 25 Mar 2017 18:08:02 +0100
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Subject: ag71xx: Fix rx ring buffer stall on small packets flood on qca956x and qca953x.
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Backported from Code Aurora QSDK
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Signed-off-by: Vittorio Gambaletta <openwrt@vittgam.net>
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diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
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index a8b19b68b2a46545fdd3ed6bdf14006f8a741185..427de6a50d0fcbc9dae11f8e6921194c0a5b09ed 100644
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--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
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+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
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@@ -996,6 +996,9 @@ void __init ath79_register_eth(unsigned int id)
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pdata->reset_bit = AR934X_RESET_GE0_MAC |
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AR934X_RESET_GE0_MDIO;
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pdata->set_speed = ar934x_set_speed_ge0;
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+
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+ if (ath79_soc == ATH79_SOC_QCA9533)
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+ pdata->disable_inline_checksum_engine = 1;
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} else {
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pdata->reset_bit = AR934X_RESET_GE1_MAC |
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AR934X_RESET_GE1_MDIO;
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@@ -1097,6 +1100,8 @@ void __init ath79_register_eth(unsigned int id)
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pdata->set_speed = qca956x_set_speed_sgmii;
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else
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pdata->set_speed = ar934x_set_speed_ge0;
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+
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+ pdata->disable_inline_checksum_engine = 1;
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} else {
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pdata->reset_bit = QCA955X_RESET_GE1_MAC |
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QCA955X_RESET_GE1_MDIO;
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diff --git a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
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index 078fa157f242ce4350185d97a61ef5d1f3f16fc5..5fdc59c7b78b84670daefa9fd831b154ded84ddc 100644
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--- a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
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+++ b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ath79/ag71xx_platform.h
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@@ -37,7 +37,7 @@ struct ag71xx_platform_data {
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u8 is_ar724x:1;
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u8 has_ar8216:1;
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u8 use_flow_control:1;
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- u8 is_qca956x:1;
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+ u8 disable_inline_checksum_engine:1;
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struct ag71xx_switch_platform_data *switch_data;
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diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
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index 566e9513d8b7c6ef101902ae7d281dcc1c233893..72dd654a691355c881b15d796fad0d640e05fc15 100644
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--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
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+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
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@@ -629,6 +629,22 @@ __ag71xx_link_adjust(struct ag71xx *ag, bool update)
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ag71xx_wr(ag, AG71XX_REG_MAC_CFG2, cfg2);
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ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, fifo5);
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ag71xx_wr(ag, AG71XX_REG_MAC_IFCTL, ifctl);
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+
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+ if (pdata->disable_inline_checksum_engine) {
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+ /*
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+ * The rx ring buffer can stall on small packets on QCA953x and
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+ * QCA956x. Disabling the inline checksum engine fixes the stall.
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+ * The wr, rr functions cannot be used since this hidden register
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+ * is outside of the normal ag71xx register block.
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+ */
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+ void __iomem *dam = ioremap_nocache(0xb90001bc, 0x4);
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+ if (dam) {
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+ __raw_writel(__raw_readl(dam) & ~BIT(27), dam);
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+ (void)__raw_readl(dam);
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+ iounmap(dam);
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+ }
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+ }
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+
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ag71xx_hw_start(ag);
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netif_carrier_on(ag->dev);
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