netdev - Re: [PATCH net-next v19 03/13] netdev: support binding dma-buf to netdevice

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240819155257.1148e869@kernel.org>
Date: Mon, 19 Aug 2024 15:52:57 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Taehee Yoo <ap420073@...il.com>
Cc: 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,
 linux-kselftest@...r.kernel.org, bpf@...r.kernel.org,
 linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Donald Hunter <donald.hunter@...il.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>, Steffen Klassert <steffen.klassert@...unet.com>, Herbert
 Xu <herbert@...dor.apana.org.au>, David Ahern <dsahern@...nel.org>, Willem
 de Bruijn <willemdebruijn.kernel@...il.com>, Shuah Khan <shuah@...nel.org>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>, Sumit
 Semwal <sumit.semwal@...aro.org>, Christian König
 <christian.koenig@....com>, Bagas Sanjaya <bagasdotme@...il.com>, Christoph
 Hellwig <hch@...radead.org>, Nikolay Aleksandrov <razor@...ckwall.org>,
 Pavel Begunkov <asml.silence@...il.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 <shakeel.butt@...ux.dev>, Jeroen de Borst
 <jeroendb@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>,
 Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>,
 Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH net-next v19 03/13] netdev: support binding dma-buf to
 netdevice

On Mon, 19 Aug 2024 00:44:27 +0900 Taehee Yoo wrote:
> > @@ -9537,6 +9540,10 @@ static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack
> >                         NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time");
> >                         return -EEXIST;
> >                 }
> > +               if (dev_get_max_mp_channel(dev) != -1) {
> > +                       NL_SET_ERR_MSG(extack, "XDP can't be installed on a netdev using memory providers");
> > +                       return -EINVAL;
> > +               }  
> 
> Should we consider virtual interfaces like bonding, bridge, etc?
> Virtual interfaces as an upper interface of physical interfaces can
> still install XDP prog.
> 
> # ip link add bond0 type bond
> # ip link set eth0 master bond0
> # ip link set bond0 xdp pin /sys/fs/bpf/x/y
> and
> # ip link set bond0 xdpgeneric pin /sys/fs/bpf/x/y
> 
> All virtual interfaces can install generic XDP prog.
> The bonding interface can install native XDP prog.

Good point. We may need some common helpers to place the checks for XDP.
They are spread all over the place now.