dm: eth: Avoid blocking on packet reception

Some devices can take a long time to work out whether they have a new packet
or now. For example the ASIX USB Ethernet dongle can take 5 seconds to do
this, since it waits until it gets a new packet on the wire before allowing
the USB bulk read packet to be submitted.

At present with driver mode the Ethernet receive code reads 32 packets. This
can take a very long time if we must wait for all 32 packets. The old code
(before driver model) worked by reading a single set of packets from the USB
device, then processing all the packets with in. It would be nice to use
the same behaviour with driver model.

Add a flag to the receive method which indicates that the driver should try
to find a packet if available, by consulting the hardware. When the flag is
not set, it should just return any packet data it has already received. If
there is none, it should return -EAGAIN so that the loop will terminate.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index 645ca6427c..bcae842389 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -528,7 +528,7 @@ static int designware_eth_send(struct udevice *dev, void *packet, int length)
 	return _dw_eth_send(priv, packet, length);
 }
 
-static int designware_eth_recv(struct udevice *dev, uchar **packetp)
+static int designware_eth_recv(struct udevice *dev, int flags, uchar **packetp)
 {
 	struct dw_eth_dev *priv = dev_get_priv(dev);