Commit eb2dc35d authored by françois romieu's avatar françois romieu Committed by David S. Miller
Browse files

r8169: RxConfig hack for the 8168evl.

The 8168evl (RTL_GIGA_MAC_VER_34) based Gigabyte GA-990FXA motherboards
are very prone to NETDEV watchdog problems without this change. See
https://bugzilla.kernel.org/show_bug.cgi?id=42899 for instance.

I don't know why it *works*. It's depressingly effective though.

For the record:
- the problem may go along IOMMU (AMD-Vi) errors but it really looks
  like a red herring.
- the patch sets the RX_MULTI_EN bit. If the 8168c doc is any guide,
  the chipset now fetches several Rx descriptors at a time.
- long ago the driver ignored the RX_MULTI_EN bit.
  e542a226

 changed the RxConfig
  settings. Whatever the problem it's now labeled a regression.
- Realtek's own driver can identify two different 8168evl devices
  (CFG_METHOD_16 and CFG_METHOD_17) where the r8169 driver only
  sees one. It sucks.
Signed-off-by: default avatarFrancois Romieu <romieu@fr.zoreil.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 65841fd5
...@@ -3894,6 +3894,7 @@ static void rtl_init_rxcfg(struct rtl8169_private *tp) ...@@ -3894,6 +3894,7 @@ static void rtl_init_rxcfg(struct rtl8169_private *tp)
case RTL_GIGA_MAC_VER_22: case RTL_GIGA_MAC_VER_22:
case RTL_GIGA_MAC_VER_23: case RTL_GIGA_MAC_VER_23:
case RTL_GIGA_MAC_VER_24: case RTL_GIGA_MAC_VER_24:
case RTL_GIGA_MAC_VER_34:
RTL_W32(RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST); RTL_W32(RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST);
break; break;
default: default:
......
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