netdev - Re: [PATCH v1 03/15] net: generalise net

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Message-ID: <ZwVT8AnAq_uERzvB@mini-arch>
Date: Tue, 8 Oct 2024 08:46:56 -0700
From: Stanislav Fomichev <stfomichev@...il.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>,
	Mina Almasry <almasrymina@...gle.com>
Subject: Re: [PATCH v1 03/15] net: generalise net_iov chunk owners

On 10/07, David Wei wrote:
> From: Pavel Begunkov <asml.silence@...il.com>
> 
> Currently net_iov stores a pointer to struct dmabuf_genpool_chunk_owner,
> which serves as a useful abstraction to share data and provide a
> context. However, it's too devmem specific, and we want to reuse it for
> other memory providers, and for that we need to decouple net_iov from
> devmem. Make net_iov to point to a new base structure called
> net_iov_area, which dmabuf_genpool_chunk_owner extends.
> 
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
>  include/net/netmem.h | 21 ++++++++++++++++++++-
>  net/core/devmem.c    | 25 +++++++++++++------------
>  net/core/devmem.h    | 25 +++++++++----------------
>  3 files changed, 42 insertions(+), 29 deletions(-)
> 
> diff --git a/include/net/netmem.h b/include/net/netmem.h
> index 8a6e20be4b9d..3795ded30d2c 100644
> --- a/include/net/netmem.h
> +++ b/include/net/netmem.h
> @@ -24,11 +24,20 @@ struct net_iov {
>  	unsigned long __unused_padding;
>  	unsigned long pp_magic;
>  	struct page_pool *pp;
> -	struct dmabuf_genpool_chunk_owner *owner;
> +	struct net_iov_area *owner;

Any reason not to use dmabuf_genpool_chunk_owner as is (or rename it
to net_iov_area to generalize) with the fields that you don't need
set to 0/NULL? container_of makes everything harder to follow :-(