From ec5dda4d0a45dfc76166f474ccb4408cdb5874bc Mon Sep 17 00:00:00 2001
From: Astro <astro@spaceboyz.net>
Date: Sat, 22 Jun 2019 01:34:17 +0200
Subject: [PATCH] eth: add const MTU

---
 src/eth/mod.rs | 11 +++++++----
 src/eth/rx.rs  |  5 +++--
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/eth/mod.rs b/src/eth/mod.rs
index 17c2842..ddd7f49 100644
--- a/src/eth/mod.rs
+++ b/src/eth/mod.rs
@@ -6,6 +6,9 @@ mod regs;
 pub mod rx;
 pub mod tx;
 
+/// Size of all the buffers
+pub const MTU: usize = 1536;
+
 pub struct Eth<RX, TX> {
     regs: &'static mut regs::RegisterBlock,
     rx: RX,
@@ -295,7 +298,7 @@ impl<RX, TX> Eth<RX, TX> {
         self.regs.dma_cfg.write(
             regs::DmaCfg::zeroed()
                 // 1536 bytes
-                .ahb_mem_rx_buf_size(0x18)
+                .ahb_mem_rx_buf_size((MTU >> 6) as u8)
                 // 8 KB
                 .rx_pktbuf_memsz_sel(0x3)
                 // 4 KB
@@ -313,10 +316,10 @@ impl<RX, TX> Eth<RX, TX> {
         );
     }
 
-    pub fn start_rx<'rx>(self, list: &'rx mut [rx::DescEntry], rx_buffers: &'rx mut [[u8; 1536]]) -> Eth<rx::DescList<'rx>, TX> {
+    pub fn start_rx<'rx>(self, rx_list: &'rx mut [rx::DescEntry], rx_buffers: &'rx mut [[u8; MTU]]) -> Eth<rx::DescList<'rx>, TX> {
         let new_self = Eth {
             regs: self.regs,
-            rx: rx::DescList::new(list, rx_buffers),
+            rx: rx::DescList::new(rx_list, rx_buffers),
             tx: self.tx,
         };
         let list_addr = new_self.rx.list_addr();
@@ -355,7 +358,7 @@ impl<RX, TX> Eth<RX, TX> {
 }
 
 impl<'rx, TX> Eth<rx::DescList<'rx>, TX> {
-    pub fn recv_next(&mut self) -> Result<Option<rx::PktRef>, rx::Error> {
+    pub fn recv_next<'s: 'p, 'p>(&'s mut self) -> Result<Option<rx::PktRef<'p>>, rx::Error> {
         let status = self.regs.rx_status.read();
         if status.hresp_not_ok() {
             // Clear
diff --git a/src/eth/rx.rs b/src/eth/rx.rs
index 36586bb..516ea80 100644
--- a/src/eth/rx.rs
+++ b/src/eth/rx.rs
@@ -1,5 +1,6 @@
 use core::ops::Deref;
 use crate::{register, register_bit, register_bits, register_bits_typed, regs::*};
+use super::MTU;
 
 #[derive(Debug)]
 pub enum Error {
@@ -43,12 +44,12 @@ register_bit!(desc_word1, global_broadcast, 31);
 #[repr(C)]
 pub struct DescList<'a> {
     list: &'a mut [DescEntry],
-    buffers: &'a mut [[u8; 1536]],
+    buffers: &'a mut [[u8; MTU]],
     next: usize,
 }
 
 impl<'a> DescList<'a> {
-    pub fn new(list: &'a mut [DescEntry], buffers: &'a mut [[u8; 1536]]) -> Self {
+    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;