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Kernel: Limit IRQ rate within E1000 network adapter

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This is not a complete fix, since spurious IRQs under heavy loads can
still occur. However, this fix limits the amount of spurious IRQs.

It is encouraged to provide a better fix in the future, probably
something that takes into account handling of PCI level-triggered
interrupts.
This commit is contained in:
Liav A 2020-03-20 00:44:42 +02:00 committed by Andreas Kling
parent dbc536e917
commit 06e7fc9dee
Notes: sideshowbarker 2024-07-19 08:09:13 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/06e7fc9deea
Pull-request: https://github.com/SerenityOS/serenity/pull/1361
Reviewed-by: https://github.com/awesomekling
1 changed files with 31 additions and 9 deletions
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40
Kernel/Net/E1000NetworkAdapter.cpp
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@ -36,7 +36,10 @@ namespace Kernel {
#define REG_STATUS 0x0008
#define REG_EEPROM 0x0014
#define REG_CTRL_EXT 0x0018
#define REG_IMASK 0x00D0
#define REG_INTERRUPT_CAUSE_READ 0x00C0
#define REG_INTERRUPT_RATE 0x00C4
#define REG_INTERRUPT_MASK_SET 0x00D0
#define REG_INTERRUPT_MASK_CLEAR 0x00D8
#define REG_RCTRL 0x0100
#define REG_RXDESCLO 0x2800
#define REG_RXDESCHI 0x2804
@ -121,6 +124,21 @@ namespace Kernel {
#define STATUS_SPEED_1000MB1 0x80
#define STATUS_SPEED_1000MB2 0xC0
// Interrupt Masks
#define INTERRUPT_TXDW (1 << 0)
#define INTERRUPT_TXQE (1 << 1)
#define INTERRUPT_LSC (1 << 2)
#define INTERRUPT_RXSEQ (1 << 3)
#define INTERRUPT_RXDMT0 (1 << 4)
#define INTERRUPT_RXO (1 << 6)
#define INTERRUPT_RXT0 (1 << 7)
#define INTERRUPT_MDAC (1 << 9)
#define INTERRUPT_RXCFG (1 << 10)
#define INTERRUPT_PHYINT (1 << 12)
#define INTERRUPT_TXD_LOW (1 << 15)
#define INTERRUPT_SRPD (1 << 16)
void E1000NetworkAdapter::detect(const PCI::Address& address)
{
if (address.is_null())
@ -163,12 +181,14 @@ E1000NetworkAdapter::E1000NetworkAdapter(PCI::Address address, u8 irq)
u32 flags = in32(REG_CTRL);
out32(REG_CTRL, flags | ECTRL_SLU);
out16(REG_INTERRUPT_RATE, 6000); // Interrupt rate of 1.536 milliseconds
initialize_rx_descriptors();
initialize_tx_descriptors();
out32(REG_IMASK, 0x1f6dc);
out32(REG_IMASK, 0xff & ~4);
in32(0xc0);
out32(REG_INTERRUPT_MASK_SET, 0x1f6dc);
out32(REG_INTERRUPT_MASK_SET, INTERRUPT_LSC | INTERRUPT_RXT0);
in32(REG_INTERRUPT_CAUSE_READ);
enable_irq();
}
@ -179,21 +199,23 @@ E1000NetworkAdapter::~E1000NetworkAdapter()
void E1000NetworkAdapter::handle_irq(const RegisterState&)
{
out32(REG_IMASK, 0x1);
out32(REG_INTERRUPT_MASK_CLEAR, 0xffffffff);
u32 status = in32(0xc0);
u32 status = in32(REG_INTERRUPT_CAUSE_READ);
if (status & 4) {
u32 flags = in32(REG_CTRL);
out32(REG_CTRL, flags | ECTRL_SLU);
}
if (status & 0x10) {
// Threshold OK?
}
if (status & 0x80) {
receive();
}
if (status & 0x10) {
// Threshold OK?
}
m_wait_queue.wake_all();
out32(REG_INTERRUPT_MASK_SET, INTERRUPT_LSC | INTERRUPT_RXT0 | INTERRUPT_RXO);
}
void E1000NetworkAdapter::detect_eeprom()