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

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Message-ID: <aV80jCHD9PGaOr87@devvm11784.nha0.facebook.com>
Date: Wed, 7 Jan 2026 20:37:32 -0800
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
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, 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
> -- 
> pw-bot: cr

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.

Best,
Bobby