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[Qemu-devel] [PATCH v2 2/2] e1000: decrement RDT if equal to RDH
From: |
Richard Tollerton |
Subject: |
[Qemu-devel] [PATCH v2 2/2] e1000: decrement RDT if equal to RDH |
Date: |
Wed, 10 Dec 2014 23:23:47 -0600 |
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 <address@hidden>
Signed-off-by: Jeff Westfahl <address@hidden>
---
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