Re: [PATCH V5 net-next 06/11] net: hibmcge: Implement .ndo_start_xmit function

On Thu, Aug 29, 2024 at 10:32:33AM +0800, Jijie Shao wrote:

on 2024/8/29 9:41, Jakub Kicinski wrote:

quoted

On Tue, 27 Aug 2024 21:14:50 +0800 Jijie Shao wrote:

quoted

@@ -111,6 +135,14 @@ static int hbg_init(struct hbg_priv *priv)
  	if (ret)
  		return ret;
+	ret = hbg_txrx_init(priv);
+	if (ret)
+		return ret;

You allocate buffers on the probe path?
The queues and all the memory will be sitting allocated but unused if
admin does ip link set dev $eth0 down?

The network port has only one queue and
the TX queue depth is 64, RX queue depth is 127.
so it doesn't take up much memory.

Also, I plan to add the self_test feature in a future patch.
If I don't allocate buffers on the probe path,
I won't be able to do a loopback test if the network port goes down unexpectedly.

When you come to implement ethtool --set-ring, you will need to
allocate and free the ring buffers outside of probe.

	Andrew