Re: [PATCH net-next] net: mana: Implement get_ringparam/set_ringparam for mana

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On Sun, 14 Jul 2024 20:40:20 -0700 Shradha Gupta wrote:
> +	if (ring->rx_jumbo_pending) {
> +		netdev_err(ndev, "%s: rx_jumbo_pending not supported\n", __func__);
> +		return -EINVAL;
> +	}
> +	if (ring->rx_mini_pending) {
> +		netdev_err(ndev, "%s: rx_mini_pending not supported\n", __func__);
> +		return -EINVAL;
> +	}

I think that core already checks this

> +	if (!apc)
> +		return -EINVAL;

Provably impossible, apc is netdev + sizeof(netdev) so it'd have to
wrap a 64b integer to be NULL :|

> +	old_tx = apc->tx_queue_size;
> +	old_rx = apc->rx_queue_size;
> +	new_tx = clamp_t(u32, ring->tx_pending, MIN_TX_BUFFERS_PER_QUEUE, MAX_TX_BUFFERS_PER_QUEUE);
> +	new_rx = clamp_t(u32, ring->rx_pending, MIN_RX_BUFFERS_PER_QUEUE, MAX_RX_BUFFERS_PER_QUEUE);
> +
> +	if (new_tx == old_tx && new_rx == old_rx)
> +		return 0;

Pretty sure core will also not call you if there's no change.
If it does please update core instead of catching this in the driver.

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