linux-kernel - Re: [RFC PATCH net-next v5 05/14] netdev: netdevice devmem allocator

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Date: Tue, 13 Feb 2024 12:01:38 -0800
From: Mina Almasry <almasrymina@...gle.com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	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>, 
	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, "David S. Miller" <davem@...emloft.net>, 
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	Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, 
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	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...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>, 
	David Wei <dw@...idwei.uk>, Jason Gunthorpe <jgg@...pe.ca>, Yunsheng Lin <linyunsheng@...wei.com>, 
	Shailend Chand <shailend@...gle.com>, Harshitha Ramamurthy <hramamurthy@...gle.com>, 
	Shakeel Butt <shakeelb@...gle.com>, Jeroen de Borst <jeroendb@...gle.com>, 
	Praveen Kaligineedi <pkaligineedi@...gle.com>, Willem de Bruijn <willemb@...gle.com>, 
	Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH net-next v5 05/14] netdev: netdevice devmem allocator

On Tue, Feb 13, 2024 at 5:24 AM Pavel Begunkov <asml.silence@...il.com> wrote:
>
> On 12/18/23 02:40, Mina Almasry wrote:
> > Implement netdev devmem allocator. The allocator takes a given struct
> > netdev_dmabuf_binding as input and allocates net_iov from that
> > binding.
> >
> > The allocation simply delegates to the binding's genpool for the
> > allocation logic and wraps the returned memory region in a net_iov
> > struct.
> >
> > Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> > Signed-off-by: Kaiyuan Zhang <kaiyuanz@...gle.com>
> > Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> >
> > ---
> >
> > v1:
> > - Rename devmem -> dmabuf (David).
> >
> > ---
> >   include/net/devmem.h | 12 ++++++++++++
> >   include/net/netmem.h | 26 ++++++++++++++++++++++++++
> >   net/core/dev.c       | 38 ++++++++++++++++++++++++++++++++++++++
> >   3 files changed, 76 insertions(+)
> >
> ...
> > diff --git a/include/net/netmem.h b/include/net/netmem.h
> > index 45eb42d9990b..7fce2efc8707 100644
> > --- a/include/net/netmem.h
> > +++ b/include/net/netmem.h
> > @@ -14,8 +14,34 @@
> >
> >   struct net_iov {
> >       struct dmabuf_genpool_chunk_owner *owner;
> > +     unsigned long dma_addr;
> >   };
> >
> > +static inline struct dmabuf_genpool_chunk_owner *
> > +net_iov_owner(const struct net_iov *niov)
> > +{
> > +     return niov->owner;
> > +}
> > +
> > +static inline unsigned int net_iov_idx(const struct net_iov *niov)
> > +{
> > +     return niov - net_iov_owner(niov)->niovs;
> > +}
> > +
> > +static inline dma_addr_t net_iov_dma_addr(const struct net_iov *niov)
> > +{
> > +     struct dmabuf_genpool_chunk_owner *owner = net_iov_owner(niov);
> > +
> > +     return owner->base_dma_addr +
> > +            ((dma_addr_t)net_iov_idx(niov) << PAGE_SHIFT);
>
> Looks like it should have been niov->dma_addr
>

Yes, indeed. Thanks for catching.

> > +}
> > +
> > +static inline struct netdev_dmabuf_binding *
> > +net_iov_binding(const struct net_iov *niov)
> > +{
> > +     return net_iov_owner(niov)->binding;
> > +}
> > +
> >   /* netmem */
> >
> >   struct netmem {
> ...
>
> --
> Pavel Begunkov



-- 
Thanks,
Mina