> > Capturing this would be very helpful, particularly if debuging in
> > the RTL8139 driver was enabled. Comparing it against the same
> > driver running under Linux would likely highlight the problem.
>
> Following your advice, I've made some progress now. I noticed that
> booting Fedora, dmesg listed a sensible MAC and IRQ, and had identified
> my chip set as "RTL-8139C" (lspci -n reports 10ec:8139 for the device).
> However Xen reported "unknown chip version, assuming RTL-8139" and
> "TxConfig = 0x0". It appears all the RTL_R[8,16,32] macros in 8139too.c
> were returning zero, so I've defined USE_IO_OPS so they call in[b,w,l]
> like 3c59x.c instead of read[b,w,l]. The patch is attached, as well as
> the resulting log output. The good news is that this identifies the
> chip set properly and reports the correct MAC. I can even configure the
> device with ifconfig and send packets onto the network.
>
> Naturally there's some bad news too - receiving packets hangs the
> machine instantly. Although pinging an unused address is OK, the return
> packet from a live address stalls Xen. Similar problems were
> experienced with a DHCP offer response and even trying to send UDP
> packets with nc.
>
> Does anybody have any experience of this working since being added to
> Xen, or have any thoughts on how I might proceed debugging it?
Accesses to the skb->data on the receive path must be wrapped with
map_domain_mem()/unmap_domain_mem().
eg.
char *vdata = map_domain_mem(__pa(skb->data));
<use vdata as you would normally use skb->data>
unmap_domain_mem(vdata);
I've taken a brief look at the driver and you may get away with just
replacing wth_copy_and_sum() in include/xeno/etherdevice.h with the
following:
static inline void eth_copy_and_sum(struct sk_buff *dest,
unsigned char *src, int len, int base)
{
char *vdata = map_domain_mem(__pa(dest->data));
memcpy(vdata, src, len);
unmap_domain_mem(vdata);
}
(You may need to #include <asm/domain_page.h>).
-- Keir
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