# Re: \[PATCH net-next v19 03/13\] netdev: support binding dma-buf to netdevice

- From: Jakub Kicinski \<kuba@kernel.org\>
- Date: 2024-08-16 00:48:56 
- List: linux-trace-kernel
- Page: https://ratatoskr.run/linux-trace-kernel/2024/08/2709791
- Thread: https://ratatoskr.run/netdev/2024/08/2706702/t.md

```text
On Tue, 13 Aug 2024 21:13:05 +0000 Mina Almasry wrote:
> +int dev_get_max_mp_channel(const struct net_device *dev)
> +{
> +	int i, max = -1;

I presume the bug from yesterday is self evident once reported? :)

> +	ASSERT_RTNL();
> +
> +	for (i = 0; i < dev->real_num_rx_queues; i++)
> +		if (dev->_rx[i].mp_params.mp_priv)
> +			/* The number of queues is the idx plus 1. */
> +			max = i + 1;

The +1 is odd. The function as it stands reports min channel count.
Not max_mp_channel, if you ask me. And if you renamed it, you don't
have to use -1 as "not installed".

> +	return max;
```