From ce74fe7299b9edb478566eccc4a2de457f85c15c Mon Sep 17 00:00:00 2001 From: Astro Date: Sat, 22 Jun 2019 01:34:47 +0200 Subject: [PATCH] eth: prepare tx --- src/eth/mod.rs | 40 ++++++++++++++---------- src/eth/tx.rs | 85 +++++++++++++++++++++++++++++++++++++++++++------- src/main.rs | 15 +++++++++ 3 files changed, 111 insertions(+), 29 deletions(-) diff --git a/src/eth/mod.rs b/src/eth/mod.rs index ddd7f495..12f75029 100644 --- a/src/eth/mod.rs +++ b/src/eth/mod.rs @@ -334,23 +334,23 @@ impl Eth { new_self } - // pub fn start_tx<'tx>(self, tx_buffers: [&'tx [u8]; tx::DESCS]) -> Eth> { - // 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.tx_en(true) - // ); - // new_self - // } + pub fn start_tx<'tx>(self, tx_list: &'tx mut [tx::DescEntry], tx_buffers: &'tx mut [[u8; MTU]]) -> Eth> { + let new_self = Eth { + regs: self.regs, + rx: self.rx, + tx: tx::DescList::new(tx_list, tx_buffers), + }; + let list_addr = &new_self.tx.list_addr(); + 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.tx_en(true) + ); + new_self + } fn wait_phy_idle(&self) { while !self.regs.net_status.read().phy_mgmt_idle() {} @@ -404,6 +404,12 @@ impl<'rx, TX> Eth, TX> { } } +impl<'tx, RX> Eth> { + pub fn send<'s: 'p, 'p>(&'s mut self, length: usize) -> Option> { + self.tx.send(&mut self.regs, length) + } +} + impl phy::PhyAccess for Eth { fn read_phy(&mut self, addr: u8, reg: u8) -> u16 { self.wait_phy_idle(); diff --git a/src/eth/tx.rs b/src/eth/tx.rs index 12039019..3674b3c5 100644 --- a/src/eth/tx.rs +++ b/src/eth/tx.rs @@ -1,8 +1,9 @@ -use core::mem::uninitialized; +use core::ops::{Deref, DerefMut}; use crate::{register, register_bit, register_bits, register_bits_typed, regs::*}; +use super::{MTU, regs}; /// Descriptor entry -struct DescEntry { +pub struct DescEntry { word0: DescWord0, word1: DescWord1, } @@ -28,26 +29,86 @@ pub const DESCS: usize = 8; #[repr(C)] pub struct DescList<'a> { - list: [DescEntry; DESCS], - buffers: [&'a [u8]; DESCS], + list: &'a mut [DescEntry], + buffers: &'a mut [[u8; MTU]], + next: usize, } impl<'a> DescList<'a> { - pub fn new(buffers: [&'a [u8]; DESCS]) -> Self { - let mut list: [DescEntry; DESCS] = unsafe { uninitialized() }; - for i in 0..DESCS { - let buffer_addr = &buffers[i][0] as *const _ as u32; - list[i].word0.write( + pub fn new(list: &'a mut [DescEntry], buffers: &'a mut [[u8; MTU]]) -> 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; + let buffer_addr = &mut buffer[0] as *mut _ as u32; + assert!(buffer_addr & 0b11 == 0); + entry.word0.write( DescWord0::zeroed() .address(buffer_addr) ); - list[i].word1.write( + entry.word1.write( DescWord1::zeroed() .used(true) - .wrap(i == DESCS - 1) + .wrap(is_last) ); } - DescList { list, buffers } + DescList { + list, + buffers, + next: 0, + } + } + + pub fn list_addr(&self) -> u32 { + &self.list[0] as *const _ as u32 + } + + pub fn send<'s: 'p, 'p>(&'s mut self, regs: &'p mut regs::RegisterBlock, length: usize) -> Option> { + let list_len = self.list.len(); + let entry = &mut self.list[self.next]; + if entry.word1.read().used() { + entry.word1.modify(|_, w| w.length(length as u16)); + let buffer = &mut self.buffers[self.next][0..length]; + + self.next += 1; + if self.next >= list_len { + self.next = 0; + } + + Some(PktRef { entry, buffer, regs }) + } else { + // Still in use by HW (sending too fast, ring exceeded) + None + } + } +} + +/// Releases a buffer back to the HW upon Drop, and start the TX +/// engine +pub struct PktRef<'a> { + entry: &'a mut DescEntry, + buffer: &'a mut [u8], + regs: &'a mut regs::RegisterBlock, +} + +impl<'a> Drop for PktRef<'a> { + fn drop(&mut self) { + self.entry.word1.modify(|_, w| w.used(false)); + self.regs.net_ctrl.modify(|_, w| + w.tx_en(true) + ); + } +} + +impl<'a> Deref for PktRef<'a> { + type Target = [u8]; + fn deref(&self) -> &Self::Target { + self.buffer + } +} + +impl<'a> DerefMut for PktRef<'a> { + fn deref_mut(&mut self) -> &mut ::Target { + self.buffer } } diff --git a/src/main.rs b/src/main.rs index b466b2b0..2f45e8bb 100644 --- a/src/main.rs +++ b/src/main.rs @@ -95,6 +95,9 @@ fn main() { 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); + let mut tx_descs: [eth::tx::DescEntry; 8] = unsafe { uninitialized() }; + let mut tx_buffers = [[0u8; 1536]; 8]; + let mut eth = eth.start_tx(&mut tx_descs, &mut tx_buffers); loop { match eth.recv_next() { @@ -110,6 +113,18 @@ fn main() { println!("eth rx error: {:?}", e); } } + + match eth.send(512) { + Some(mut pkt) => { + let mut x = 0; + for b in pkt.iter_mut() { + *b = x; + x += 1; + } + println!("eth tx {} bytes", pkt.len()); + } + None => println!("eth tx shortage"), + } } panic!("End"); }