- the TX reclaim loop in int_handler multiplied sizeof.txfd by itself (mul eax) instead of by last_tx, so it looked 1024 bytes past tx_ring and never freed a descriptor
- it also left txfd.status set, and transmit treats a non-zero status as busy, so once the 16-entry ring wrapped every send ended in "TX overrun": DHCP fell back to link-local, ping showed "Socket error", while the link still read as connected
- reclaim only descriptors the device completed (TXFD_STATUS_C) and zero their status; transmit now checks for an unreclaimed buffer (virt_addr)
Seen on an EtherExpress Pro/100 in a Pentium II. Reproduced in QEMU (-cpu pentium2, i82557b): ping stopped at the 12th reply every time; with the fix it runs indefinitely, also under a UDP flood.
Reviewed-on: KolibriOS/kolibrios#725
Reviewed-by: hidnplayr <hidnplayr@gmail.com>
Reviewed-by: Burer <burer@kolibrios.org>
Co-authored-by: leency <lipatov.kiril@gmail.com>
Leency
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