Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4

[Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>]

On 29/12/15 17:59, Programmingkid wrote:

> This patch solves the few problems that needed to be solved in order for a
> Mac OS 10.4 guest to use the rtl8139 nic. 
> 
> The pci_dma_read() function would only return zero when a MemoryRegion object
> was not enabled. Enabling the object makes the pci_dma_read() function work
> correctly.
> 
> The Linux rtl8139 driver needs base address register zero set to PIO. This
> conflicts with Mac OS 10.4's driver needing base address register zero set to
> MMIO. So a macro has been added that allows the user to decide which operating
> system this network interface card will be compatible with. Note: Windows XP's
> driver works regardless of the macro setting.
> 
> Signed-off-by: John Arbuckle <programmingkidx@gmail.com>
> 
> ---
>  hw/net/rtl8139.c     |   15 ++++++++++++++-
>  include/hw/pci/pci.h |    1 +
>  2 files changed, 15 insertions(+), 1 deletions(-)
> 
> diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
> index 90ef72b..e17a471 100644
> --- a/hw/net/rtl8139.c
> +++ b/hw/net/rtl8139.c
> @@ -64,6 +64,14 @@
>  /* debug RTL8139 card */
>  //#define DEBUG_RTL8139 1
>  
> +/*
> + * The driver that ships with Mac OS 10.4 has to have its base address register
> + * 0 set to MMIO space. This directly conflicts with the Linux driver that
> + * needs the PIO set to base address register 0. Mac OS 10.5 or higher does not
> + * need this macro set.
> + */
> +/* #define MAC_OS_10_4_DRIVER_COMPATIBILITY 1 */
> +
>  #define PCI_PERIOD 30    /* 30 ns period = 33.333333 Mhz frequency */
>  
>  #define SET_MASKED(input, mask, curr) \
> @@ -3444,9 +3452,14 @@ static void pci_rtl8139_realize(PCIDevice *dev, Error **errp)
>                            "rtl8139", 0x100);
>      memory_region_init_io(&s->bar_mem, OBJECT(s), &rtl8139_mmio_ops, s,
>                            "rtl8139", 0x100);
> +
> +#ifdef MAC_OS_10_4_DRIVER_COMPATIBILITY
> +    pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar_mem);
> +    pci_register_bar(dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &s->bar_io);
> +#else
>      pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &s->bar_io);
>      pci_register_bar(dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar_mem);
> -
> +#endif
>      qemu_macaddr_default_if_unset(&s->conf.macaddr);
>  
>      /* prepare eeprom */
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index 379b6e1..8e95c75 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -699,6 +699,7 @@ static inline int pci_dma_rw(PCIDevice *dev, dma_addr_t addr,
>  static inline int pci_dma_read(PCIDevice *dev, dma_addr_t addr,
>                                 void *buf, dma_addr_t len)
>  {
> +    memory_region_set_enabled(&dev->bus_master_enable_region, true);
>      return pci_dma_rw(dev, addr, buf, len, DMA_DIRECTION_TO_DEVICE);
>  }

Can you provide more information about how you tested this patch? The
ordering of the BARs is interesting - according to
http://www.opensource.apple.com/source/AppleRTL8139Ethernet/AppleRTL8139Ethernet-141/RTL8139.cpp
the driver tries to map the BARs like this:


// Get the virtual address mapping of CSR registers located at
// Base Address Range 0 (0x10).

csrMap = pciNub->mapDeviceMemoryWithRegister( kIOPCIConfigBaseAddress1 );

if ( 0 == csrMap )
    break;


Now according to
http://www.opensource.apple.com/source/IOPCIFamily/IOPCIFamily-151.5/IOKit/pci/IOPCIDevice.h
kIOPCIConfigBaseAddress1 is actually BAR1 rather than BAR0, although in
rtl8139.c both bar_mem and bar_io access the chip registers so I'm not
sure why this would fail - can you try and trace the accesses through to
determine exactly why the NIC doesn't work with the current BAR ordering?


ATB,

Mark.