Some drivers set RDT=RDH. Oddly, this works on real hardware. To work
around this, autodecrement RDT when this happens.
Signed-off-by: Richard Tollerton <rich.toller...@ni.com>
Signed-off-by: Jeff Westfahl <jeff.westf...@ni.com>
---
hw/net/e1000.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 44ae3a8..b8cbfc1 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -1152,6 +1152,12 @@ mac_writereg(E1000State *s, int index, uint32_t val)
static void
set_rdt(E1000State *s, int index, uint32_t val)
{
+ if (val == s->mac_reg[RDH]) { /* Decrement RDT if it's too big */
+ if (val == 0) {
+ val = s->mac_reg[RDLEN] / sizeof(struct e1000_rx_desc);
+ }
+ val--;
+ }
s->mac_reg[index] = val & 0xffff;
if (e1000_has_rxbufs(s, 1)) {
qemu_flush_queued_packets(qemu_get_queue(s->nic));
--
2.1.3
