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eth rx: descriptors/buffers as refs

avoid moving these after their addresses have been written to the qbar
This commit is contained in:
Astro 2019-06-21 00:58:18 +02:00
parent d65398205f
commit e5881a14ad
4 changed files with 31 additions and 45 deletions

View File

@ -290,8 +290,8 @@ impl<RX, TX> Eth<RX, TX> {
self.regs.dma_cfg.write(
regs::DmaCfg::zeroed()
// 1600 bytes
.ahb_mem_rx_buf_size(0x19)
// 1536 bytes
.ahb_mem_rx_buf_size(0x18)
// 8 KB
.rx_pktbuf_memsz_sel(0x3)
// 4 KB
@ -306,37 +306,23 @@ impl<RX, TX> Eth<RX, TX> {
self.regs.net_ctrl.write(
regs::NetCtrl::zeroed()
.mgmt_port_en(true)
.tx_en(true)
.rx_en(true)
);
}
pub fn start_rx<'rx>(self, rx_buffers: [&'rx mut [u8]; rx::DESCS]) -> Eth<rx::DescList<'rx>, TX> {
pub fn start_rx<'rx>(self, list: &'rx mut [rx::DescEntry], rx_buffers: &'rx mut [[u8; 1536]]) -> Eth<rx::DescList<'rx>, TX> {
let new_self = Eth {
regs: self.regs,
rx: rx::DescList::new(rx_buffers),
rx: rx::DescList::new(list, rx_buffers),
tx: self.tx,
};
let list_addr = &new_self.rx as *const _ as u32;
let list_addr = new_self.rx.list_addr();
assert!(list_addr & 0b11 == 0);
new_self.regs.rx_qbar.write(
regs::RxQbar::zeroed()
.rx_q_baseaddr(list_addr >> 2)
);
new_self
}
pub fn start_tx<'tx>(self, tx_buffers: [&'tx [u8]; tx::DESCS]) -> Eth<RX, tx::DescList<'tx>> {
let new_self = Eth {
regs: self.regs,
rx: self.rx,
tx: tx::DescList::new(tx_buffers),
};
let list_addr = &new_self.tx as *const _ as u32;
assert!(list_addr & 0b11 == 0);
new_self.regs.tx_qbar.write(
regs::TxQbar::zeroed()
.tx_q_baseaddr(list_addr >> 2)
new_self.regs.net_ctrl.modify(|_, w|
w.rx_en(true)
);
new_self
}

View File

@ -240,7 +240,9 @@ register_bit!(dma_cfg, ahb_endian_swp_pkt_en, 7);
register_bits!(dma_cfg, rx_pktbuf_memsz_sel, u8, 8, 9);
register_bit!(dma_cfg, tx_pktbuf_memsz_sel, 10);
register_bit!(dma_cfg, csum_gen_offload_en, 11);
register_bits!(dma_cfg, ahb_mem_rx_buf_size, u8, 16, 23);
register_bits!(dma_cfg,
/// 64 bytes unit
ahb_mem_rx_buf_size, u8, 16, 23);
register_bit!(dma_cfg, disc_when_no_ahb, 24);
register!(tx_status, TxStatus, RW, u32);

View File

@ -3,7 +3,7 @@ use crate::{register, register_bit, register_bits, register_bits_typed, regs::*}
/// Descriptor entry
#[repr(C)]
struct DescEntry {
pub struct DescEntry {
word0: DescWord0,
word1: DescWord1,
}
@ -32,40 +32,43 @@ register_bit!(desc_word1, uni_hash_match, 29);
register_bit!(desc_word1, multi_hash_match, 30);
register_bit!(desc_word1, global_broadcast, 31);
/// Number of descriptors
pub const DESCS: usize = 8;
#[repr(C)]
pub struct DescList<'a> {
list: [DescEntry; DESCS],
buffers: [&'a mut [u8]; DESCS],
list: &'a mut [DescEntry],
buffers: &'a mut [[u8; 1536]],
next: usize,
}
impl<'a> DescList<'a> {
pub fn new(buffers: [&'a mut [u8]; DESCS]) -> Self {
let mut list: [DescEntry; DESCS] = unsafe { uninitialized() };
for i in 0..DESCS {
assert!(buffers[i].len() >= 1536);
let buffer_addr = &mut buffers[i][0] as *mut _ as u32;
pub fn new(list: &'a mut [DescEntry], buffers: &'a mut [[u8; 1536]]) -> Self {
let last = list.len().min(buffers.len()) - 1;
for (i, (entry, buffer)) in list.iter_mut().zip(buffers.iter_mut()).enumerate() {
let is_last = i == last;
assert!(buffer.len() >= 1536);
let buffer_addr = &mut buffer[0] as *mut _ as u32;
assert!(buffer_addr & 0b11 == 0);
list[i].word0.write(
entry.word0.write(
DescWord0::zeroed()
.used(false)
.wrap(i == DESCS - 1)
.wrap(is_last)
.address(buffer_addr >> 2)
);
list[i].word1.write(
entry.word1.write(
DescWord1::zeroed()
);
}
DescList {
list, buffers,
list,
buffers,
next: 0,
}
}
pub fn list_addr(&self) -> u32 {
&self.list[0] as *const _ as u32
}
pub fn recv_next(&mut self) -> Option<&[u8]> {
if self.list[self.next].word0.read().used() {
let len = self.list[self.next].word1

View File

@ -92,14 +92,9 @@ fn main() {
}
}
let mut rx_buffers = [[0u8; 1536]; eth::rx::DESCS];
let mut rx_buffer_ptrs: [&mut [u8]; eth::rx::DESCS] = unsafe {
uninitialized()
};
for (i, (ptr, buf)) in rx_buffer_ptrs.iter_mut().zip(rx_buffers.iter_mut()).enumerate() {
*ptr = buf;
}
let mut eth = eth.start_rx(rx_buffer_ptrs);
let mut rx_descs: [eth::rx::DescEntry; 8] = unsafe { uninitialized() };
let mut rx_buffers = [[0u8; 1536]; 8];
let mut eth = eth.start_rx(&mut rx_descs, &mut rx_buffers);
loop {
match eth.recv_next() {