netdev - Re: [PATCH net-next v8 0/5] net: devmem: improve cpu cost of RX token management

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Message-ID: <20260108064200.7faf9735@kernel.org>
Date: Thu, 8 Jan 2026 06:42:00 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Bobby Eshleman <bobbyeshleman@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, Willem de Bruijn
 <willemb@...gle.com>, Neal Cardwell <ncardwell@...gle.com>, David Ahern
 <dsahern@...nel.org>, Arnd Bergmann <arnd@...db.de>, Jonathan Corbet
 <corbet@....net>, Andrew Lunn <andrew+netdev@...n.ch>, Shuah Khan
 <shuah@...nel.org>, Donald Hunter <donald.hunter@...il.com>, Mina Almasry
 <almasrymina@...gle.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org, Stanislav
 Fomichev <sdf@...ichev.me>, asml.silence@...il.com, matttbe@...nel.org,
 skhawaja@...gle.com, Bobby Eshleman <bobbyeshleman@...a.com>
Subject: Re: [PATCH net-next v8 0/5] net: devmem: improve cpu cost of RX
 token management

On Wed, 7 Jan 2026 20:37:32 -0800 Bobby Eshleman wrote:
> On Wed, Jan 07, 2026 at 07:30:13PM -0800, Jakub Kicinski wrote:
> > On Wed, 07 Jan 2026 16:57:34 -0800 Bobby Eshleman wrote:  
> > > This series improves the CPU cost of RX token management by adding an
> > > attribute to NETDEV_CMD_BIND_RX that configures sockets using the
> > > binding to avoid the xarray allocator and instead use a per-binding niov
> > > array and a uref field in niov.  
> > 
> > net/ipv4/tcp.c:2600:41: error: implicit declaration of function ‘net_devmem_dmabuf_binding_get’; did you mean ‘net_devmem_dmabuf_binding_put’? [-Wimplicit-function-declaration]
> >  2600 |                                         net_devmem_dmabuf_binding_get(binding);
> >       |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >       |                                         net_devmem_dmabuf_binding_put
> 
> I see that net_devmem_dmabuf_binding_get() is lacking a
> stub for CONFIG_NET_DEVMEM=n ...
> 
> Just curious how pw works... is this a randconfig catch? I ask because
> all of the build targets pass for this series (build_allmodconfig_warn,
> build_clang, etc.. locally and on patchwork.kernel.org), and if there is
> a config that pw uses that I'm missing in my local checks I'd like to
> add it.

kunit hit it on our end