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Re: [Qemu-devel] [PATCH v2 1/2] Fix eepro100 simple transmission mode


From: Thomas Huth
Subject: Re: [Qemu-devel] [PATCH v2 1/2] Fix eepro100 simple transmission mode
Date: Thu, 16 Nov 2017 17:59:22 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 06.11.2017 21:35, Mike Nawrocki wrote:
> The simple transmission mode was treating the area immediately after the
> transmit command block (TCB) as if it were a transmit buffer descriptor,
> when in reality it is simply the packet data. This change simply copies
> the data following the TCB into the packet buffer.
> 
> Signed-off-by: Mike Nawrocki <address@hidden>
> ---
>  hw/net/eepro100.c | 18 +++---------------
>  1 file changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/hw/net/eepro100.c b/hw/net/eepro100.c
> index 80b8f47c4b..91dd058010 100644
> --- a/hw/net/eepro100.c
> +++ b/hw/net/eepro100.c
> @@ -774,23 +774,11 @@ static void tx_command(EEPRO100State *s)
>      }
>      assert(tcb_bytes <= sizeof(buf));
>      while (size < tcb_bytes) {
> -        uint32_t tx_buffer_address = ldl_le_pci_dma(&s->dev, tbd_address);
> -        uint16_t tx_buffer_size = lduw_le_pci_dma(&s->dev, tbd_address + 4);
> -#if 0
> -        uint16_t tx_buffer_el = lduw_le_pci_dma(&s->dev, tbd_address + 6);
> -#endif
> -        if (tx_buffer_size == 0) {
> -            /* Prevent an endless loop. */
> -            logout("loop in %s:%u\n", __FILE__, __LINE__);
> -            break;
> -        }
> -        tbd_address += 8;
>          TRACE(RXTX, logout
>              ("TBD (simplified mode): buffer address 0x%08x, size 0x%04x\n",
> -             tx_buffer_address, tx_buffer_size));
> -        tx_buffer_size = MIN(tx_buffer_size, sizeof(buf) - size);
> -        pci_dma_read(&s->dev, tx_buffer_address, &buf[size], tx_buffer_size);
> -        size += tx_buffer_size;
> +             tbd_address, tcb_bytes));
> +        pci_dma_read(&s->dev, tbd_address, &buf[size], tcb_bytes);
> +        size += tcb_bytes;
>      }
>      if (tbd_array == 0xffffffff) {
>          /* Simplified mode. Was already handled by code above. */
> 

 Hi,

I've got no clue why, but apparently this patch introduced a regression
in rc1: The tests/pxe-test is now failing on a big endian (s390x) host
when testing the i82550 device.
It's working fine with commit 8fa5ad6dfb66b6c695aa6a6b54b7031c (and
2.11-rc0), and it's broken starting with commit
1865e288a823c764cd4344d704e33344 ... do you have any clue what might be
wrong here now?

 Thomas



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