netdev - Re: [PATCH net-next v5 10/15] idpf: add splitq start

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Date: Fri, 18 Aug 2023 11:37:40 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
Cc: davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com,
 netdev@...r.kernel.org, Joshua Hay <joshua.a.hay@...el.com>,
 pavan.kumar.linga@...el.com, emil.s.tantilov@...el.com,
 jesse.brandeburg@...el.com, sridhar.samudrala@...el.com,
 shiraz.saleem@...el.com, sindhu.devale@...el.com, willemb@...gle.com,
 decot@...gle.com, andrew@...n.ch, leon@...nel.org, mst@...hat.com,
 simon.horman@...igine.com, shannon.nelson@....com,
 stephen@...workplumber.org, Alan Brady <alan.brady@...el.com>, Madhu
 Chittim <madhu.chittim@...el.com>, Phani Burra <phani.r.burra@...el.com>
Subject: Re: [PATCH net-next v5 10/15] idpf: add splitq start_xmit

On Tue, 15 Aug 2023 17:43:00 -0700 Tony Nguyen wrote:
> +	netif_stop_subqueue(tx_q->vport->netdev, tx_q->idx);
> +
> +	/* Memory barrier before checking head and tail */
> +	smp_mb();
> +
> +	/* Check again in a case another CPU has just made room available. */
> +	if (likely(IDPF_DESC_UNUSED(tx_q) < size))
> +		return -EBUSY;
> +
> +	/* A reprieve! - use start_subqueue because it doesn't call schedule */
> +	netif_start_subqueue(tx_q->vport->netdev, tx_q->idx);

Please use the helpers from include/net/netdev_queues.h.