forked from M-Labs/zynq-rs
zynq::eth: remove all memory barriers
They were not the solution.
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parent
afd96bd887
commit
cae02947bc
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@ -3,8 +3,6 @@ use vcell::VolatileCell;
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use crate::{register, register_bit, register_bits, regs::*};
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use super::MTU;
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use crate::cortex_a9::asm;
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#[derive(Debug)]
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pub enum Error {
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HrespNotOk,
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@ -79,8 +77,6 @@ impl<'a> DescList<'a> {
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DescWord1::zeroed()
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);
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}
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// Ensure descriptors get written before they are read.
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asm::dmb();
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DescList {
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// Shorten the list of descriptors to the required number.
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@ -100,7 +96,6 @@ impl<'a> DescList<'a> {
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if entry.word0.read().used() {
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let word1 = entry.word1.read();
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let len = word1.frame_length_lsbs().into();
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asm::dmb();
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let buffer = &mut self.buffers[self.next][0..len];
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self.next += 1;
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@ -128,9 +123,6 @@ pub struct PktRef<'a> {
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impl<'a> Drop for PktRef<'a> {
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fn drop(&mut self) {
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// Ensure that any buffer reads have finished before we
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// release the buffer to the hardware.
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asm::dmb();
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self.entry.word0.modify(|_, w| w.used(false));
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}
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}
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@ -1,7 +1,6 @@
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use core::ops::{Deref, DerefMut};
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use vcell::VolatileCell;
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use crate::{register, register_bit, register_bits, regs::*};
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use crate::cortex_a9::asm;
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use super::{MTU, regs};
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/// Descriptor entry
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@ -73,8 +72,6 @@ impl<'a> DescList<'a> {
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.last_buffer(true)
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);
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}
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// Ensure the descriptor words get written before they are read.
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asm::dsb();
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DescList {
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// Shorten the list of descriptors to the required number.
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@ -123,14 +120,7 @@ pub struct PktRef<'a> {
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impl<'a> Drop for PktRef<'a> {
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fn drop(&mut self) {
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// Ensure that all writes to the buffer have finished before
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// they are read again.
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asm::dmb();
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self.entry.word1.modify(|_, w| w.used(false));
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// Ensure that the descriptor write has finished before it is
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// read again, and (by DSB, not just DMB) that it has been
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// written before the register access.
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asm::dsb();
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if ! self.regs.tx_status.read().tx_go() {
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self.regs.net_ctrl.modify(|_, w|
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w.start_tx(true)
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