From: Jean-Christophe Dubois <j...@tribudubois.net>
The actual imx_eth_enable_rx() function is buggy.
It updates s->regs[ENET_RDAR] after calling qemu_flush_queued_packets().
qemu_flush_queued_packets() is going to call imx_XXX_receive() which itself
is going to call imx_eth_enable_rx().
By updating s->regs[ENET_RDAR] after calling qemu_flush_queued_packets()
we end up updating the register with an outdated value which might
lead to disabling the receive function in the i.MX FEC/ENET device.
This patch change the place where the register update is done so that the
register value stays up to date and the receive function can keep
running.
Reported-by: Fyleo <fyle...@gmail.com>
Tested-by: Fyleo <fyle...@gmail.com>
Signed-off-by: Jean-Christophe Dubois <j...@tribudubois.net>
Message-id: 20180113113445.2705-1-...@tribudubois.net
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Reviewed-by: Andrey Smirnov <andrew.smir...@gmail.com>
Tested-by: Andrey Smirnov <andrew.smir...@gmail.com>
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
hw/net/imx_fec.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c
index 4fb48f6..9506f9b 100644
--- a/hw/net/imx_fec.c
+++ b/hw/net/imx_fec.c
@@ -595,19 +595,16 @@ static void imx_eth_do_tx(IMXFECState *s, uint32_t index)
static void imx_eth_enable_rx(IMXFECState *s, bool flush)
{
IMXFECBufDesc bd;
- bool rx_ring_full;
imx_fec_read_bd(&bd, s->rx_descriptor);
- rx_ring_full = !(bd.flags & ENET_BD_E);
+ s->regs[ENET_RDAR] = (bd.flags & ENET_BD_E) ? ENET_RDAR_RDAR : 0;
- if (rx_ring_full) {
+ if (!s->regs[ENET_RDAR]) {
FEC_PRINTF("RX buffer full\n");
} else if (flush) {
qemu_flush_queued_packets(qemu_get_queue(s->nic));
}
-
- s->regs[ENET_RDAR] = rx_ring_full ? 0 : ENET_RDAR_RDAR;
}
static void imx_eth_reset(DeviceState *d)
@@ -866,7 +863,6 @@ static void imx_eth_write(void *opaque, hwaddr offset,
uint64_t value,
case ENET_RDAR:
if (s->regs[ENET_ECR] & ENET_ECR_ETHEREN) {
if (!s->regs[index]) {
- s->regs[index] = ENET_RDAR_RDAR;
imx_eth_enable_rx(s, true);
}
} else {
--
2.7.4
