As reported by Aaro this patch causes network problems on
MIPS Loongson platform. Therefore revert it.

Fixes: f072218c ("r8169: remove not needed call to dma_sync_single_for_device")
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reported-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Sync EEE init for RTL8168h with vendor driver and add two writes to
vendor-specific registers.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Now that the Realtek PHY driver maps the vendor-specific EEE registers
to the standard MMD registers, we can remove all special handling and
use the generic functions phy_ethtool_get/set_eee.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Holger reported sporadic transmit timeouts and it turned out that one
path misses ringing the doorbell. Fix was suggested by Eric.

Fixes: ef143585 ("r8169: make use of xmit_more")
Suggested-by: NEric Dumazet <edumazet@google.com>
Tested-by: NHolger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

rtl8169_free_rx_databuff is used in only one place, so let's inline it.
We can improve the loop because rtl8169_init_ring zero's RX_databuff
before calling rtl8169_rx_fill, and rtl8169_rx_fill fills
Rx_databuff starting from index 0.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Disabling TSO but leaving SG active results is a significant
performance drop. Therefore disable also SG on RTL8168evl.
This restores the original performance.

Fixes: 93681cd7 ("r8169: enable HW csum and TSO")
Signed-off-by: NHolger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We allocate 16kb per rx buffer, so we can avoid some overhead by using
alloc_pages_node directly instead of bothering kmalloc_node. Due to
this change buffers are page-aligned now, therefore the alignment check
can be removed.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Acked-by: NHayes Wang <hayeswang@realtek.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Synchronize PCIe PHY initialization with vendor driver version 8.047.01.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add a helper for MAC OCP read-modify-write operations.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This code piece was inherited from RTL8139 code, the register at
address 0x5c however has a different meaning on RTL8169 and is unused.
So we can remove this.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There was a previous attempt to use xmit_more, but the change had to be
reverted because under load sometimes a transmit timeout occurred [0].
Maybe this was caused by a missing memory barrier, the new attempt
keeps the memory barrier before the call to netif_stop_queue like it
is used by the driver as of today. The new attempt also changes the
order of some calls as suggested by Eric.

[0] https://lkml.org/lkml/2019/2/10/39Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It was reported that after resuming from suspend network fails with
error "do_IRQ: 3.38 No irq handler for vector", see [0]. Enabling WoL
can work around the issue, but the only actual fix is to disable MSI.
So let's mimic the behavior of the vendor driver and disable MSI on
all chip versions before RTL8168d.

[0] https://bugzilla.kernel.org/show_bug.cgi?id=204079

Fixes: 6c6aa15f ("r8169: improve interrupt handling")
Reported-by: NDušan Dragić <dragic.dusan@gmail.com>
Tested-by: NDušan Dragić <dragic.dusan@gmail.com>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This reverts commit a6851c61.
It was reported that RTL8111b successfully finishes 1000/Full autoneg
but no data flows. Reverting the original patch fixes the issue.
It seems to be a HW issue with the integrated RTL8211B PHY. This PHY
version used also e.g. on RTL8168d, so better revert the original patch.
Reported-by: NBernhard Held <berny156@gmx.de>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Enable HW csum and TSO per default except on known buggy chip versions.
Realtek confirmed that RTL8168evl has a HW issue with TSO.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The loop in r8169_csum_workaround is called only if in
msdn_giant_send_check a copy of the skb header needs to be made and
we don't have enough memory. Let's simply drop the packet in that case
so that we can remove r8169_csum_workaround.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Implement callback ndo_features_check and move all feature checks there.
This will allow us to get rid of r8169_csum_workaround() completely in
a subsequent step. Like in the vendor driver disable HW csum for short
packets on RTL8168b.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Set GSO max size and max segment number as in the vendor driver.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Align setting PME with the vendor driver. PMEnable is writable on
RTL8169 only, on later chip versions it's read-only. PME_SIGNAL is
used on chip versions from RTL8168evl with the exception of the
RTL8168f family.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch improves and simplifies rtl_set_rx_mode a little.
No functional change intended.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Replace "additonal" by "additional" in a comment.
Typo found by checkpatch.pl.
Signed-off-by: NCorentin Musard <corentinmusard@gmail.com>
Reviewed-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch improves few aspects of rtl_rx, no functional change intended.

1. inline rtl8169_try_rx_copy
2. make pkt_size unsigned
3. use constant ETH_FCS_LEN instead of value 4
4. We just created the skb, so we don't need the checks in skb_put.
   Also we don't need the return value of skb_put.
   Set skb->tail and skb->len directly.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This fixes a copy&paste error in the original patch. Setting the wrong
register resulted in massive packet loss on some systems.

Fixes: a2928d28 ("r8169: use paged versions of phylib MDIO access functions")
Tested-by: NThomas Voegtle <tv@lio96.de>
Signed-off-by: NThomas Voegtle <tv@lio96.de>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

On RTL8411b the RX unit gets confused if the PHY is powered-down.
This was reported in [0] and confirmed by Realtek. Realtek provided
a sequence to fix the RX unit after PHY wakeup.

The issue itself seems to have been there longer, the Fixes tag
refers to where the fix applies properly.

[0] https://bugzilla.redhat.com/show_bug.cgi?id=1692075

Fixes: a99790bf ("r8169: Reinstate ASPM Support")
Tested-by: NIonut Radu <ionut.radu@gmail.com>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch syncs the name of few chip versions with the latest vendor
driver version.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It was reported that the GPD MicroPC is broken in a way that no valid
MAC address can be read from the network chip. The vendor driver deals
with this by assigning a random MAC address as fallback. So let's do
the same.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This reverts commit 759d0957.

The patch was based on a misunderstanding. As Al Viro pointed out [0]
it's simply wrong on big endian. So let's revert it.

[0] https://marc.info/?t=156200975600004&r=1&w=2Reported-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

DMA_API_HOWTO.txt includes an example explaining when
dma_sync_single_for_device() is not needed, and that example matches
our use case. The buffer isn't changed by the CPU and direction is
DMA_FROM_DEVICE, so we can remove the call to
dma_sync_single_for_device().
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Documentation/DMA-API-HOWTO.txt states:
By default, the kernel assumes that your device can address 32-bits of
DMA addressing. For a 64-bit capable device, this needs to be increased,
and for a device with limitations, it needs to be decreased.

Therefore we don't need the 32 Bit DMA fallback configuration and can
remove it.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The VLAN tag is stored in the descriptor in network byte order.
Using swab16 works on little endian host systems only. Better play safe
and use ntohs or htons respectively.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Certain chip version / board combinations have massive problems if
ASPM is active. If BIOS enables ASPM and doesn't let OS control it,
then we may have a problem with the current code. Therefore check the
return code of pci_disable_link_state() and don't enable ASPM in the
network chip if OS can't control ASPM.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The Abit Fatal1ty F-190HD has a PCI ID quirk and the entry marks this
board as not GBit-capable, what is wrong. According to [0] the board
has a RTL8111B that is GBit-capable, therefore remove the
RTL_CFG_NO_GBIT flag.

[0] https://www.centos.org/forums/viewtopic.php?t=23390Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

>From RTL8168e-vl the value in register MaxTxPacketSize is interpreted
differently, therefore use new helper rtl_is_8168evl_up to set this
register.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add helper rtl_is_8168evl_up to make the code better readable and to
simplify it.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tp->coalesce_info is used in rtl_coalesce_info() only, so we can
remove this member. In addition replace phy_ethtool_get_link_ksettings
with a direct access to tp->phydev->speed.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In case of a timeout currently ~0 is returned. Callers often just check
whether a certain bit is set and therefore may behave incorrectly.
So let's return -ETIMEDOUT in case of a timeout.

r8168_phy_ocp_read is used in r8168g_mdio_read only, therefore we can
apply the same change.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Simplify the code by removing struct rtl_cfg_info. Only info we need
per PCI ID is whether it supports GBit or not.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

To prepare removal of struct rtl_cfg_info, set the coalesce
config based on the chip version number.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

After the latest changes we don't need separate functions
rtl_hw_start_8168 and rtl_hw_start_8101 any longer. This allows us to
simplify the code. For this change we need to move rtl_hw_start() and
rtl_hw_start_8169(). rtl_hw_start_8169() is unchanged.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

CPCMD_QUIRK_MASK isn't specific to certain chip versions. The vendor
driver applies this mask to all 8168 versions. Therefore remove QUIRK
from the mask name and apply it on all chip versions.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

So far several places in the code deal with setting the interrupt mask
for the respective chip versions. Improve this by having one function
for this only. In addition don't set RxFIFOOver for all 8101 chip
versions like in the vendor driver.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>