diff options
| author | Jean-Christophe Dubois <jcd@tribudubois.net> | 2018-01-25 11:45:28 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-01-25 11:45:28 +0000 |
| commit | 1b58d58f76289212f40d71282ae3a85d6cd65fef (patch) | |
| tree | ae15446d077b63e623429ebd484edbda527badf7 /hw | |
| parent | 9aea1ea31af25fe344a88da086ff913cca09c667 (diff) | |
i.MX: Fix FEC/ENET receive funtions
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we end up updating the register with an outdated value which might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 <fyleo45@gmail.com>
Tested-by: Fyleo <fyleo45@gmail.com>
Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net>
Message-id: 20180113113445.2705-1-jcd@tribudubois.net
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Tested-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/net/imx_fec.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/hw/net/imx_fec.c b/hw/net/imx_fec.c index 4fb48f62ba..9506f9b69f 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 { |