linux-kernel - Re: [PATCH net-next v20 00/13] Device Memory TCP

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Message-ID: <CAHS8izMqcLnmo9792FPkkXPQSBWSjFGO+QHhkou=PaDHLwtsRw@mail.gmail.com>
Date: Mon, 19 Aug 2024 16:38:32 -0400
From: Mina Almasry <almasrymina@...gle.com>
To: 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, 
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	bpf@...r.kernel.org, linux-media@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, 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>, Taehee Yoo <ap420073@...il.com>, 
	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>
Subject: Re: [PATCH net-next v20 00/13] Device Memory TCP

On Sun, Aug 18, 2024 at 11:54 PM Mina Almasry <almasrymina@...gle.com> wrote:
>
> v20: https://patchwork.kernel.org/project/netdevbpf/list/?series=879373&state=*
> ====
>
> v20 aims to resolve a couple of bug reports against v19, and addresses
> some review comments around the page_pool_check_memory_provider
> mechanism.
>
> Major changes:
> - Test edge cases such as header split disabled in selftest.
> - Change `offset = 0` back to `offset = offset - start` to resolve issue
>   found in RX path by Taehee (thanks!)
> - Address a few comments around page_pool_check_memory_provider() from
>   Pavel & Jakub.
> - Removed some unnecessary includes across various patches in the
>   series.
> - Removed unnecessary EXPORT_SYMBOL(page_pool_mem_providers) (Jakub).
> - Fix regression caused by incorrect dev_get_max_mp_channel check, along
>   with rename (Jakub).
>

Looks like in this iteration I resolved the previous test failure, but
introduced a build regression with certain configs:

ld: vmlinux.o: in function `netdev_rx_queue_restart':
(.text+0x6a4133): undefined reference to `page_pool_check_memory_provider'
make[3]: *** [../scripts/Makefile.vmlinux:34: vmlinux] Error 1
make[2]: *** [/home/kunit/testing/Makefile:1156: vmlinux] Error 2
make[1]: *** [/home/kunit/testing/Makefile:224: __sub-make] Error 2
make: *** [Makefile:224: __sub-make] Error 2

Looks like I'm not build testing with enough config variations (in
this case CONFIG_NET=y but CONFIG_PAGE_POOL=n). I've fixed the issue
locally and added a test to my presubmit checks with this config and a
couple of risky others. Sorry about that.