netdev - Re: [RFC PATCH net-next v2 1/9] queue

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Message-ID: <20240504121154.GF3167983@kernel.org>
Date: Sat, 4 May 2024 13:11:54 +0100
From: Simon Horman <horms@...nel.org>
To: David Wei <dw@...idwei.uk>
Cc: netdev@...r.kernel.org, Michael Chan <michael.chan@...adcom.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Andy Gospodarek <andrew.gospodarek@...adcom.com>,
	Adrian Alvarado <adrian.alvarado@...adcom.com>,
	Mina Almasry <almasrymina@...gle.com>,
	Shailend Chand <shailend@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [RFC PATCH net-next v2 1/9] queue_api: define queue api

On Wed, May 01, 2024 at 09:54:02PM -0700, David Wei wrote:
> From: Mina Almasry <almasrymina@...gle.com>
> 
> This API enables the net stack to reset the queues used for devmem TCP.
> 
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> Signed-off-by: David Wei <dw@...idwei.uk>

...

> diff --git a/include/net/netdev_queues.h b/include/net/netdev_queues.h
> index 1ec408585373..58042957c39f 100644
> --- a/include/net/netdev_queues.h
> +++ b/include/net/netdev_queues.h
> @@ -60,6 +60,33 @@ struct netdev_stat_ops {
>  			       struct netdev_queue_stats_tx *tx);
>  };
>  
> +/**
> + * struct netdev_queue_mgmt_ops - netdev ops for queue management
> + *
> + * @ndo_queue_mem_alloc: Allocate memory for an RX queue. The memory returned
> + *			 in the form of a void* can be passed to
> + *			 ndo_queue_mem_free() for freeing or to ndo_queue_start
> + *			 to create an RX queue with this memory.
> + *
> + * @ndo_queue_mem_free:	Free memory from an RX queue.
> + *
> + * @ndo_queue_start:	Start an RX queue at the specified index.
> + *
> + * @ndo_queue_stop:	Stop the RX queue at the specified index.
> + */
> +struct netdev_queue_mgmt_ops {
> +       void *                  (*ndo_queue_mem_alloc)(struct net_device *dev,
> +                                                      int idx);
> +       void                    (*ndo_queue_mem_free)(struct net_device *dev,
> +                                                     void *queue_mem);
> +       int                     (*ndo_queue_start)(struct net_device *dev,
> +                                                  int idx,
> +                                                  void *queue_mem);
> +       int                     (*ndo_queue_stop)(struct net_device *dev,
> +                                                 int idx,
> +                                                 void **out_queue_mem);

Nit: The indentation (before the return types) should use tabs rather than
     spaces. And I'm not sure I see the value of the large indentation after
     the return types. Basically, I suggest this:

	void * (*ndo_queue_mem_alloc)(struct net_device *dev, int idx);
	void   (*ndo_queue_mem_free)(struct net_device *dev, void *queue_mem);
	int    (*ndo_queue_start)(struct net_device *dev, int idx,
				  void *queue_mem);
	int    (*ndo_queue_stop)(struct net_device *dev, int idx,
				 void **out_queue_mem);

> +};
> +
>  /**
>   * DOC: Lockless queue stopping / waking helpers.
>   *
> -- 
> 2.43.0
> 
>