netdev - Re: [PATCH net-next v8 04/17] net: prepare for non devmem TCP memory providers

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Message-ID: <CAHS8izM+gvUSEPHbJ_ao0ih9NALnADvT3hYBno_-JgKS9rYz8w@mail.gmail.com>
Date: Mon, 9 Dec 2024 09:04:08 -0800
From: Mina Almasry <almasrymina@...gle.com>
To: David Wei <dw@...idwei.uk>
Cc: io-uring@...r.kernel.org, netdev@...r.kernel.org, 
	Jens Axboe <axboe@...nel.dk>, Pavel Begunkov <asml.silence@...il.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, David Ahern <dsahern@...nel.org>, 
	Stanislav Fomichev <stfomichev@...il.com>, Joe Damato <jdamato@...tly.com>, 
	Pedro Tammela <pctammela@...atatu.com>
Subject: Re: [PATCH net-next v8 04/17] net: prepare for non devmem TCP memory providers

On Wed, Dec 4, 2024 at 9:22 AM David Wei <dw@...idwei.uk> wrote:
>
> From: Pavel Begunkov <asml.silence@...il.com>
>
> There is a good bunch of places in generic paths assuming that the only
> page pool memory provider is devmem TCP. As we want to reuse the net_iov
> and provider infrastructure, we need to patch it up and explicitly check
> the provider type when we branch into devmem TCP code.
>
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
>  net/core/devmem.c         | 10 ++++++++--
>  net/core/devmem.h         |  8 ++++++++
>  net/core/page_pool_user.c | 15 +++++++++------
>  net/ipv4/tcp.c            |  6 ++++++
>  4 files changed, 31 insertions(+), 8 deletions(-)
>
> diff --git a/net/core/devmem.c b/net/core/devmem.c
> index 01738029e35c..78983a98e5dc 100644
> --- a/net/core/devmem.c
> +++ b/net/core/devmem.c
> @@ -28,6 +28,12 @@ static DEFINE_XARRAY_FLAGS(net_devmem_dmabuf_bindings, XA_FLAGS_ALLOC1);
>
>  static const struct memory_provider_ops dmabuf_devmem_ops;
>
> +bool net_is_devmem_page_pool_ops(const struct memory_provider_ops *ops)
> +{
> +       return ops == &dmabuf_devmem_ops;
> +}
> +EXPORT_SYMBOL_GPL(net_is_devmem_page_pool_ops);
> +
>  static void net_devmem_dmabuf_free_chunk_owner(struct gen_pool *genpool,
>                                                struct gen_pool_chunk *chunk,
>                                                void *not_used)
> @@ -316,10 +322,10 @@ void dev_dmabuf_uninstall(struct net_device *dev)
>         unsigned int i;
>
>         for (i = 0; i < dev->real_num_rx_queues; i++) {
> -               binding = dev->_rx[i].mp_params.mp_priv;
> -               if (!binding)
> +               if (dev->_rx[i].mp_params.mp_ops != &dmabuf_devmem_ops)
>                         continue;
>

Maybe use the net_is_devmem_page_pool_ops helper you defined here.

Reviewed-by: Mina Almasry <almasrymina@...gle.com>

-- 
Thanks,
Mina