Rewrite ethmac to split ownership into RX/TX halves.

This commit is contained in:
whitequark 2018-03-27 09:10:20 +00:00
parent 5a5596f7a2
commit 308ad97586
1 changed files with 183 additions and 164 deletions

View File

@ -100,82 +100,176 @@ fn phy_write_ext(reg_addr: u8, reg_data: u16) {
phy_write(EPHY_ADDAR, reg_data);
}
struct DeviceInner {
tx_desc_buf: [u32; ETH_TX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
rx_desc_buf: [u32; ETH_RX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
tx_cur_desc: usize,
rx_cur_desc: usize,
tx_counter: u32,
rx_counter: u32,
tx_pkt_buf: [u8; ETH_TX_BUFFER_COUNT * ETH_TX_BUFFER_SIZE],
rx_pkt_buf: [u8; ETH_RX_BUFFER_COUNT * ETH_RX_BUFFER_SIZE],
struct RxRing {
desc_buf: [u32; ETH_RX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
cur_desc: usize,
counter: u32,
pkt_buf: [u8; ETH_RX_BUFFER_COUNT * ETH_RX_BUFFER_SIZE],
}
impl DeviceInner {
fn new() -> DeviceInner {
DeviceInner {
tx_desc_buf: [0; ETH_TX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
rx_desc_buf: [0; ETH_RX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
tx_cur_desc: 0,
rx_cur_desc: 0,
tx_counter: 0,
rx_counter: 0,
tx_pkt_buf: [0; ETH_TX_BUFFER_COUNT * ETH_TX_BUFFER_SIZE],
rx_pkt_buf: [0; ETH_RX_BUFFER_COUNT * ETH_RX_BUFFER_SIZE],
impl RxRing {
fn new() -> RxRing {
RxRing {
desc_buf: [0; ETH_RX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
cur_desc: 0,
counter: 0,
pkt_buf: [0; ETH_RX_BUFFER_COUNT * ETH_RX_BUFFER_SIZE],
}
}
fn init(&mut self, mac_addr: EthernetAddress) {
// Initialize TX DMA descriptors
for x in 0..ETH_TX_BUFFER_COUNT {
let p = x * ETH_DESC_U32_SIZE;
let r = x * ETH_TX_BUFFER_SIZE;
// Initialize transmit flags
self.tx_desc_buf[p + 0] = 0;
// Initialize transmit buffer size
self.tx_desc_buf[p + 1] = 0;
// Transmit buffer address
self.tx_desc_buf[p + 2] = (&self.tx_pkt_buf[r] as *const u8) as u32;
// Next descriptor address
if x != ETH_TX_BUFFER_COUNT - 1 {
self.tx_desc_buf[p + 3] = (&self.tx_desc_buf[p + ETH_DESC_U32_SIZE] as *const u32) as u32;
} else {
self.tx_desc_buf[p + 3] = (&self.tx_desc_buf[0] as *const u32) as u32;
}
// Reserved fields
self.tx_desc_buf[p + 4] = 0;
self.tx_desc_buf[p + 5] = 0;
// Transmit frame time stamp
self.tx_desc_buf[p + 6] = 0;
self.tx_desc_buf[p + 7] = 0;
}
fn init(&mut self) {
// Initialize RX DMA descriptors
for x in 0..ETH_RX_BUFFER_COUNT {
let p = x * ETH_DESC_U32_SIZE;
let r = x * ETH_RX_BUFFER_SIZE;
// The descriptor is initially owned by the DMA
self.rx_desc_buf[p + 0] = EMAC_RDES0_OWN;
self.desc_buf[p + 0] = EMAC_RDES0_OWN;
// Use chain structure rather than ring structure
self.rx_desc_buf[p + 1] = EMAC_RDES1_RCH | ((ETH_RX_BUFFER_SIZE as u32) & EMAC_RDES1_RBS1);
self.desc_buf[p + 1] =
EMAC_RDES1_RCH | ((ETH_RX_BUFFER_SIZE as u32) & EMAC_RDES1_RBS1);
// Receive buffer address
self.rx_desc_buf[p + 2] = (&self.rx_pkt_buf[r] as *const u8) as u32;
self.desc_buf[p + 2] = (&self.pkt_buf[r] as *const u8) as u32;
// Next descriptor address
if x != ETH_RX_BUFFER_COUNT - 1 {
self.rx_desc_buf[p + 3] = (&self.rx_desc_buf[p + ETH_DESC_U32_SIZE] as *const u32) as u32;
self.desc_buf[p + 3] =
(&self.desc_buf[p + ETH_DESC_U32_SIZE] as *const u32) as u32;
} else {
self.rx_desc_buf[p + 3] = (&self.rx_desc_buf[0] as *const u32) as u32;
self.desc_buf[p + 3] =
(&self.desc_buf[0] as *const u32) as u32;
}
// Extended status
self.rx_desc_buf[p + 4] = 0;
self.desc_buf[p + 4] = 0;
// Reserved field
self.rx_desc_buf[p + 5] = 0;
self.desc_buf[p + 5] = 0;
// Transmit frame time stamp
self.rx_desc_buf[p + 6] = 0;
self.rx_desc_buf[p + 7] = 0;
self.desc_buf[p + 6] = 0;
self.desc_buf[p + 7] = 0;
}
}
fn buf_owned(&self) -> bool {
self.desc_buf[self.cur_desc + 0] & EMAC_RDES0_OWN == 0
}
fn buf_valid(&self) -> bool {
self.desc_buf[self.cur_desc + 0] &
(EMAC_RDES0_FS | EMAC_RDES0_LS | EMAC_RDES0_ES) ==
(EMAC_RDES0_FS | EMAC_RDES0_LS)
}
unsafe fn buf_as_slice<'a>(&self) -> &'a [u8] {
let len = (self.desc_buf[self.cur_desc + 0] & EMAC_RDES0_FL) >> 16;
let len = cmp::min(len as usize, ETH_RX_BUFFER_SIZE);
let addr = self.desc_buf[self.cur_desc + 2] as *const u8;
slice::from_raw_parts(addr, len)
}
fn buf_release(&mut self) {
self.desc_buf[self.cur_desc + 0] = EMAC_RDES0_OWN;
self.cur_desc += ETH_DESC_U32_SIZE;
if self.cur_desc == self.desc_buf.len() {
self.cur_desc = 0;
}
self.counter += 1;
}
}
struct TxRing {
desc_buf: [u32; ETH_TX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
cur_desc: usize,
counter: u32,
pkt_buf: [u8; ETH_TX_BUFFER_COUNT * ETH_TX_BUFFER_SIZE],
}
impl TxRing {
fn new() -> TxRing {
TxRing {
desc_buf: [0; ETH_TX_BUFFER_COUNT * ETH_DESC_U32_SIZE],
cur_desc: 0,
counter: 0,
pkt_buf: [0; ETH_TX_BUFFER_COUNT * ETH_TX_BUFFER_SIZE],
}
}
fn init(&mut self) {
// Initialize TX DMA descriptors
for x in 0..ETH_TX_BUFFER_COUNT {
let p = x * ETH_DESC_U32_SIZE;
let r = x * ETH_TX_BUFFER_SIZE;
// Initialize transmit flags
self.desc_buf[p + 0] = 0;
// Initialize transmit buffer size
self.desc_buf[p + 1] = 0;
// Transmit buffer address
self.desc_buf[p + 2] = (&self.pkt_buf[r] as *const u8) as u32;
// Next descriptor address
if x != ETH_TX_BUFFER_COUNT - 1 {
self.desc_buf[p + 3] =
(&self.desc_buf[p + ETH_DESC_U32_SIZE] as *const u32) as u32;
} else {
self.desc_buf[p + 3] =
(&self.desc_buf[0] as *const u32) as u32;
}
// Reserved fields
self.desc_buf[p + 4] = 0;
self.desc_buf[p + 5] = 0;
// Transmit frame time stamp
self.desc_buf[p + 6] = 0;
self.desc_buf[p + 7] = 0;
}
}
fn buf_owned(&self) -> bool {
self.desc_buf[self.cur_desc + 0] & EMAC_TDES0_OWN == 0
}
unsafe fn buf_as_slice<'a>(&mut self, len: usize) -> &'a mut [u8] {
let len = cmp::min(len, ETH_TX_BUFFER_SIZE);
self.desc_buf[self.cur_desc + 1] = len as u32;
let addr = self.desc_buf[self.cur_desc + 2] as *mut u8;
slice::from_raw_parts_mut(addr, len)
}
fn buf_release(&mut self) {
self.desc_buf[self.cur_desc + 0] =
EMAC_TDES0_OWN | EMAC_TDES0_LS | EMAC_TDES0_FS | EMAC_TDES0_TCH;
cortex_m::interrupt::free(|cs| {
let emac0 = tm4c129x::EMAC0.borrow(cs);
// Clear TU flag to resume processing
emac0.dmaris.write(|w| w.tu().bit(true));
// Instruct the DMA to poll the transmit descriptor list
unsafe { emac0.txpolld.write(|w| w.tpd().bits(0)); }
});
self.cur_desc += ETH_DESC_U32_SIZE;
if self.cur_desc == self.desc_buf.len() {
self.cur_desc = 0;
}
self.counter += 1;
}
}
pub struct Device {
rx: RxRing,
tx: TxRing,
}
impl Device {
pub fn new() -> Device {
Device {
rx: RxRing::new(),
tx: TxRing::new(),
}
}
// After `init` is called, `Device` shall not be moved.
pub unsafe fn init(&mut self, mac: EthernetAddress) {
self.rx.init();
self.tx.init();
cortex_m::interrupt::free(|cs| {
let sysctl = tm4c129x::SYSCTL.borrow(cs);
@ -254,10 +348,15 @@ impl DeviceInner {
});
// Set the MAC address
let mac_addr = mac_addr.0;
emac0.addr0h.write(|w| unsafe { w.addrhi().bits(mac_addr[4] as u16 | ((mac_addr[5] as u16) << 8)) });
emac0.addr0l.write(|w| unsafe {
w.addrlo().bits(mac_addr[0] as u32 | ((mac_addr[1] as u32) << 8) | ((mac_addr[2] as u32) << 16) | ((mac_addr[3] as u32) << 24))
w.addrlo().bits( mac.0[0] as u32 |
((mac.0[1] as u32) << 8) |
((mac.0[2] as u32) << 16) |
((mac.0[3] as u32) << 24))
});
emac0.addr0h.write(|w| unsafe {
w.addrhi().bits( mac.0[4] as u16 |
((mac.0[5] as u16) << 8))
});
// Set MAC filtering options (?)
@ -273,8 +372,12 @@ impl DeviceInner {
emac0.flowctl.write(|w| unsafe { w.bits(0)}); // Disable flow control ???
emac0.txdladdr.write(|w| unsafe { w.bits((&self.tx_desc_buf[0] as *const u32) as u32)});
emac0.rxdladdr.write(|w| unsafe { w.bits((&self.rx_desc_buf[0] as *const u32) as u32)});
emac0.txdladdr.write(|w| unsafe {
w.bits((&mut self.tx.desc_buf[0] as *mut u32) as u32)
});
emac0.rxdladdr.write(|w| unsafe {
w.bits((&mut self.rx.desc_buf[0] as *mut u32) as u32)
});
// Manage MAC transmission and reception
emac0.cfg.modify(|_, w|
@ -289,80 +392,6 @@ impl DeviceInner {
);
});
}
// RX buffer functions
fn rx_buf_owned(&self) -> bool {
self.rx_desc_buf[self.rx_cur_desc + 0] & EMAC_RDES0_OWN == 0
}
fn rx_buf_valid(&self) -> bool {
self.rx_desc_buf[self.rx_cur_desc + 0] &
(EMAC_RDES0_FS | EMAC_RDES0_LS | EMAC_RDES0_ES) ==
(EMAC_RDES0_FS | EMAC_RDES0_LS)
}
unsafe fn rx_buf_as_slice<'a>(&self) -> &'a [u8] {
let len = (self.rx_desc_buf[self.rx_cur_desc + 0] & EMAC_RDES0_FL) >> 16;
let len = cmp::min(len as usize, ETH_RX_BUFFER_SIZE);
let addr = self.rx_desc_buf[self.rx_cur_desc + 2] as *const u8;
slice::from_raw_parts(addr, len)
}
fn rx_buf_release(&mut self) {
self.rx_desc_buf[self.rx_cur_desc + 0] = EMAC_RDES0_OWN;
self.rx_cur_desc += ETH_DESC_U32_SIZE;
if self.rx_cur_desc == self.rx_desc_buf.len() {
self.rx_cur_desc = 0;
}
self.rx_counter += 1;
}
// TX buffer functions
fn tx_buf_owned(&self) -> bool {
self.tx_desc_buf[self.tx_cur_desc + 0] & EMAC_TDES0_OWN == 0
}
unsafe fn tx_buf_as_slice<'a>(&mut self, len: usize) -> &'a mut [u8] {
let len = cmp::min(len, ETH_TX_BUFFER_SIZE);
self.tx_desc_buf[self.tx_cur_desc + 1] = len as u32;
let addr = self.tx_desc_buf[self.tx_cur_desc + 2] as *mut u8;
slice::from_raw_parts_mut(addr, len)
}
fn tx_buf_release(&mut self) {
self.tx_desc_buf[self.tx_cur_desc + 0] =
EMAC_TDES0_OWN | EMAC_TDES0_LS | EMAC_TDES0_FS | EMAC_TDES0_TCH;
cortex_m::interrupt::free(|cs| {
let emac0 = tm4c129x::EMAC0.borrow(cs);
// Clear TU flag to resume processing
emac0.dmaris.write(|w| w.tu().bit(true));
// Instruct the DMA to poll the transmit descriptor list
unsafe { emac0.txpolld.write(|w| w.tpd().bits(0)); }
});
self.tx_cur_desc += ETH_DESC_U32_SIZE;
if self.tx_cur_desc == self.tx_desc_buf.len() {
self.tx_cur_desc = 0;
}
self.tx_counter += 1;
}
}
pub struct Device(RefCell<DeviceInner>);
impl Device {
pub fn new() -> Device {
Device(RefCell::new(DeviceInner::new()))
}
// After `init` is called, `Device` shall not be moved.
pub unsafe fn init(&mut self, mac: EthernetAddress) {
self.0.borrow_mut().init(mac);
}
}
impl<'a, 'b> phy::Device<'a> for &'b mut Device {
@ -377,55 +406,45 @@ impl<'a, 'b> phy::Device<'a> for &'b mut Device {
}
fn receive(&mut self) -> Option<(RxToken, TxToken)> {
{
let mut device = self.0.borrow_mut();
// Skip all queued packets with errors.
while device.rx_buf_owned() && !device.rx_buf_valid() {
device.rx_buf_release()
while self.rx.buf_owned() && !self.rx.buf_valid() {
self.rx.buf_release()
}
if !(device.rx_buf_owned() && device.tx_buf_owned()) {
if !(self.rx.buf_owned() && self.tx.buf_owned()) {
return None
}
}
Some((RxToken(&self.0), TxToken(&self.0)))
Some((RxToken(&mut self.rx), TxToken(&mut self.tx)))
}
fn transmit(&mut self) -> Option<TxToken> {
{
let device = self.0.borrow_mut();
if !device.tx_buf_owned() {
if !self.tx.buf_owned() {
return None
}
}
Some(TxToken(&self.0))
Some(TxToken(&mut self.tx))
}
}
pub struct RxToken<'a>(&'a RefCell<DeviceInner>);
pub struct RxToken<'a>(&'a mut RxRing);
impl<'a> phy::RxToken for RxToken<'a> {
fn consume<R, F>(self, _timestamp: Instant, f: F) -> Result<R>
where F: FnOnce(&[u8]) -> Result<R> {
let mut device = self.0.borrow_mut();
let result = f(unsafe { device.rx_buf_as_slice() });
device.rx_buf_release();
let result = f(unsafe { self.0.buf_as_slice() });
self.0.buf_release();
result
}
}
pub struct TxToken<'a>(&'a RefCell<DeviceInner>);
pub struct TxToken<'a>(&'a mut TxRing);
impl<'a> phy::TxToken for TxToken<'a> {
fn consume<R, F>(self, _timestamp: Instant, len: usize, f: F) -> Result<R>
where F: FnOnce(&mut [u8]) -> Result<R> {
let mut device = self.0.borrow_mut();
let result = f(unsafe { device.tx_buf_as_slice(len) });
device.tx_buf_release();
let result = f(unsafe { self.0.buf_as_slice(len) });
self.0.buf_release();
result
}
}