[Qemu-devel] [PATCH] lance.c emulation corrections

[Igor Kovalenko]

Hi!

lance.c emulation implements incorrect algorithm to scan receive/transmit descriptors:
 - it scans a whole ring of descriptors instead of stopping at first owned by host
 - it skips buffers in corner cases
 - card is not reset, current rx/tx descriptor number is not reset when card is stopped by driver

Attached patch should fix these problems.
On-demand packet transmission is also implemented.

Without this patch I had ~500 byte/second transfers with qemu-system-sparc,
now it network speed is much better :)

Looking at 7990 chip docs (main chip on lance card) it seems like there are more features
not implemented; e.g. 1.6ms timer is needed to implement "normal" transmission.

lance-20060810-1.diff
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