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

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Date: Fri, 8 Mar 2024 16:27:39 -0800
From: Mina Almasry <almasrymina@...gle.com>
To: David Wei <dw@...idwei.uk>
Cc: 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, 
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	dri-devel@...ts.freedesktop.org, "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>, 
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	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
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	Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...nel.org>, 
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	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 Fri, Mar 8, 2024 at 3:48 PM David Wei <dw@...idwei.uk> wrote:
>
> 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?
>

Sure thing, go for it! Thanks!

I think we've going to have someone from GVE working on this in
parallel. I see no issue with us aligning on what the core-net ndos
would look like and implementing those in parallel for both drivers.
We're not currently planning to make any changes to the ndos besides
applying Jakub's feedback from this thread. If you find a need to
deviate from this, let us know and we'll work on staying in line with
that. Thanks!

-- 
Thanks,
Mina