runtime: print ethmac preamble error count.

Also, print total error count, not the difference (but still compute
the difference to determine *when* to print).

artiq/firmware/runtime/ethmac.rs

@@ -109,7 +109,8 @@ impl phy::TxToken for EthernetTxSlot {
 
 #[derive(Debug, Clone, PartialEq, Eq, Default)]
 pub struct EthernetStatistics {
-    rx_errors:  u32,
+    rx_preamble_errors: u32,
+    rx_crc_errors:      u32,
     rx_dropped:         u32,
 }
 
@@ -117,7 +118,8 @@ impl EthernetStatistics {
     pub fn new() -> Self {
         unsafe {
             EthernetStatistics {
-                rx_errors:  csr::ethmac::crc_errors_read(),
+                rx_preamble_errors: csr::ethmac::preamble_errors_read(),
+                rx_crc_errors:      csr::ethmac::crc_errors_read(),
                 rx_dropped:         csr::ethmac::sram_writer_errors_read(),
             }
         }
@@ -128,7 +130,8 @@ impl EthernetStatistics {
         *self = Self::new();
 
         let diff = EthernetStatistics {
-            rx_errors:  self.rx_errors.wrapping_sub(old.rx_errors),
+            rx_preamble_errors: self.rx_preamble_errors.wrapping_sub(old.rx_preamble_errors),
+            rx_crc_errors:      self.rx_crc_errors.wrapping_sub(old.rx_crc_errors),
             rx_dropped:         self.rx_dropped.wrapping_sub(old.rx_dropped),
         };
         if diff == EthernetStatistics::default() {
@@ -141,8 +144,11 @@ impl EthernetStatistics {
 
 impl fmt::Display for EthernetStatistics {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        if self.rx_errors > 0 {
+        if self.rx_preamble_errors > 0 {
-            write!(f, " rx crc errors: {}", self.rx_errors)?
+            write!(f, " rx preamble errors: {}", self.rx_preamble_errors)?
+        }
+        if self.rx_crc_errors > 0 {
+            write!(f, " rx crc errors: {}", self.rx_crc_errors)?
         }
         if self.rx_dropped > 0 {
             write!(f, " rx dropped: {}", self.rx_dropped)?

artiq/firmware/runtime/lib.rs

@@ -178,7 +178,7 @@ fn startup_ethernet() {
         }
 
         if let Some(net_stats_diff) = net_stats.update() {
-            warn!("ethernet mac:{}", net_stats_diff); // mac:{} (sic)
+            warn!("ethernet mac:{}", ethmac::EthernetStatistics::new());
         }
     }
 }

conda/artiq-dev/meta.yaml

@@ -15,7 +15,7 @@ requirements:
     - python >=3.5.3,<3.6
     - setuptools 33.1.1
     - migen 0.5
-    - misoc 0.7.dev py35_8+git1ac1d7d9
+    - misoc 0.7.dev py35_32+30979b2e
     - jesd204b 0.4
     - binutils-or1k-linux >=2.27
     - llvm-or1k