r8169: set RxConfig after tx/rx is enabled for RTL8169sb/8110sb devices

I have two Ethernet adapters:
  r8169 0000:03:01.0 eth0: RTL8169sb/8110sb, 00:14:d1:14:2d:49, XID 10000000, IRQ 18
  r8169 0000:01:00.0 eth0: RTL8168e/8111e, 64:66:b3:11:14:5d, XID 2c200000, IRQ 30
And after upgrading from linux 4.15 [1] to linux 4.18+ [2] RTL8169sb failed to
receive any packets. tcpdump shows a lot of checksum mismatch.

  [1]: 79891bc8c312108e420a172353b234fbc8fb0781
  [2]: ec0c18ccafacdb14d832853f05ee3f97812fc894 (4.19 merge window opened)

I started bisecting and the found that [3] breaks it. According to [4]:
  "For 8110S, 8110SB, and 8110SC series, the initial value of RxConfig
  needs to be set after the tx/rx is enabled."
So I moved rtl_init_rxcfg() after enabling tx/rs and now my adapter works
(RTL8168e works too).

  [3]: da511848f808552f06dfdff571547411717dd0fb
  [4]: 792f18cc5ae51474869386bfc3ac617da87da9de ("r8169: adjust the RxConfig
settings.")

Also drop "rx" from rtl_set_rx_tx_config_registers(), since it does nothing
with it already.

Fixes: da511848f808552f06dfdff571547411717dd0fb ("r8169: simplify
rtl_hw_start_8169")

Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: Realtek linux nic maintainers <nic_swsd@realtek.com>
Signed-off-by: Azat Khuzhin <a3at.mail@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 0efa977c422dd5a32a8a241a5c32b6fc2cd71664..ac306797590ecc8e8d633f65b21aaa1a53731ed0 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -4522,7 +4522,7 @@ static void rtl8169_hw_reset(struct rtl8169_private *tp)
        rtl_hw_reset(tp);
 }
 
-static void rtl_set_rx_tx_config_registers(struct rtl8169_private *tp)
+static void rtl_set_tx_config_registers(struct rtl8169_private *tp)
 {
        /* Set DMA burst size and Interframe Gap Time */
        RTL_W32(tp, TxConfig, (TX_DMA_BURST << TxDMAShift) |
@@ -4633,12 +4633,14 @@ static void rtl_hw_start(struct  rtl8169_private *tp)
 
        rtl_set_rx_max_size(tp);
        rtl_set_rx_tx_desc_registers(tp);
-       rtl_set_rx_tx_config_registers(tp);
+       rtl_set_tx_config_registers(tp);
        RTL_W8(tp, Cfg9346, Cfg9346_Lock);
 
        /* Initially a 10 us delay. Turned it into a PCI commit. - FR */
        RTL_R8(tp, IntrMask);
        RTL_W8(tp, ChipCmd, CmdTxEnb | CmdRxEnb);
+       rtl_init_rxcfg(tp);
+
        rtl_set_rx_mode(tp->dev);
        /* no early-rx interrupts */
        RTL_W16(tp, MultiIntr, RTL_R16(tp, MultiIntr) & 0xf000);