linux-kernel - Re: [RFC PATCH net-next v6 01/15] queue

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Date: Fri, 8 Mar 2024 15:47:51 -0800
From: David Wei <dw@...idwei.uk>
To: Mina Almasry <almasrymina@...gle.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-alpha@...r.kernel.org, linux-mips@...r.kernel.org,
 linux-parisc@...r.kernel.org, sparclinux@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Jonathan Corbet <corbet@....net>,
 Richard Henderson <richard.henderson@...aro.org>,
 Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner
 <mattst88@...il.com>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Helge Deller <deller@....de>, Andreas Larsson <andreas@...sler.com>,
 Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman
 <eddyz87@...il.com>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...nel.org>,
 Willem de Bruijn <willemdebruijn.kernel@...il.com>,
 Shuah Khan <shuah@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Pavel Begunkov <asml.silence@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
 Yunsheng Lin <linyunsheng@...wei.com>, Shailend Chand <shailend@...gle.com>,
 Harshitha Ramamurthy <hramamurthy@...gle.com>,
 Jeroen de Borst <jeroendb@...gle.com>,
 Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: Re: [RFC PATCH net-next v6 01/15] queue_api: define queue api

On 2024-03-04 18:01, Mina Almasry wrote:
> This API enables the net stack to reset the queues used for devmem.
> 
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> 
> ---
>  include/linux/netdevice.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index c41019f34179..3105c586355d 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1435,6 +1435,20 @@ struct netdev_net_notifier {
>   *			   struct kernel_hwtstamp_config *kernel_config,
>   *			   struct netlink_ext_ack *extack);
>   *	Change the hardware timestamping parameters for NIC device.
> + *
> + * void *(*ndo_queue_mem_alloc)(struct net_device *dev, int idx);
> + *	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.
> + *
> + * void	(*ndo_queue_mem_free)(struct net_device *dev, void *);
> + *	Free memory from an RX queue.
> + *
> + * int (*ndo_queue_start)(struct net_device *dev, int idx, void *);
> + *	Start an RX queue at the specified index.
> + *
> + * int (*ndo_queue_stop)(struct net_device *dev, int idx, void **);
> + *	Stop the RX queue at the specified index.
>   */
>  struct net_device_ops {
>  	int			(*ndo_init)(struct net_device *dev);
> @@ -1679,6 +1693,16 @@ struct net_device_ops {
>  	int			(*ndo_hwtstamp_set)(struct net_device *dev,
>  						    struct kernel_hwtstamp_config *kernel_config,
>  						    struct netlink_ext_ack *extack);
> +	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);
>  };

I'm working to port bnxt over to using this API. What are your thoughts
on maybe pulling this out and use bnxt to drive it?

>  
>  /**