linux-kernel - Re: [PATCH net-next] net: mana: Implement get_ringparam/set

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Message-ID: <20240716055238.GC16469@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Mon, 15 Jul 2024 22:52:38 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Long Li <longli@...rosoft.com>,
	Ajay Sharma <sharmaajay@...rosoft.com>,
	Simon Horman <horms@...nel.org>,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>,
	Erick Archer <erick.archer@...look.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Ahmed Zaki <ahmed.zaki@...el.com>,
	Colin Ian King <colin.i.king@...il.com>
Subject: Re: [PATCH net-next] net: mana: Implement
 get_ringparam/set_ringparam for mana

On Mon, Jul 15, 2024 at 06:45:51AM -0700, Jakub Kicinski wrote:
> 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.

Thanks for the comments Jakub. I'll verify these and make the relevant changes in the next version

> 
> Please keep in mind that net-next will be closed for the duration
> of the merge window.
Noted, Thanks.

> -- 
> pw-bot: cr