From: Jakub Kicinski <kuba@kernel.org>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: "Mina Almasry" <almasrymina@google.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org,
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"Shailend Chand" <shailend@google.com>,
"Harshitha Ramamurthy" <hramamurthy@google.com>,
"Shakeel Butt" <shakeel.butt@linux.dev>,
"Jeroen de Borst" <jeroendb@google.com>,
"Praveen Kaligineedi" <pkaligineedi@google.com>,
"Willem de Bruijn" <willemb@google.com>,
"Kaiyuan Zhang" <kaiyuanz@google.com>
Subject: Re: [PATCH net-next v18 07/14] memory-provider: dmabuf devmem memory provider
Date: Mon, 12 Aug 2024 16:57:08 -0700 [thread overview]
Message-ID: <20240812165708.33234ed6@kernel.org> (raw)
In-Reply-To: <a6747b29-ed79-49d4-9ffe-b62074db1e09@gmail.com>
On Mon, 12 Aug 2024 20:10:39 +0100 Pavel Begunkov wrote:
> > 1. Drivers need to be able to say "I support unreadable netmem".
> > Failure to report unreadable netmem support should cause the netlink
> > API to fail when the user tries to bind dmabuf/io uring memory.
> >
> > 2. Drivers need to be able to say "I want a header pool (with readable
> > netmem)" or "I want a data pool (potentially with unreadable netmem)".
> >
> > Pavel is suggesting implementing both of these in 2 different flags.
> >
> > Jakub is suggesting implementing both with 1 flag which says "I can
> > support unreadable netmem for this pool" , and guarding against #1
> > with a refcount check to detect if a dmabuf pool should have been
> > created but wasn't.
>
> That would be iffy IIUC, but I think Jakub just explicitly said
> that the refcount trick was just for debugging purposes and not
> for gauging errors like "providers are not supported by the driver".
>
> "Yup, the refcount (now: check of the page pool list) was meant
> as a WARN_ONCE() to catch bad drivers."
Sorry, insufficient caffeine level in the morning.
We can't WARN_ONCE(), indeed.
next prev parent reply other threads:[~2024-08-12 23:57 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-05 21:25 [PATCH net-next v18 00/14] Device Memory TCP Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 01/14] netdev: add netdev_rx_queue_restart() Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 02/14] net: netdev netlink api to bind dma-buf to a net device Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 03/14] netdev: support binding dma-buf to netdevice Mina Almasry
2024-08-06 20:37 ` Jakub Kicinski
2024-08-05 21:25 ` [PATCH net-next v18 04/14] netdev: netdevice devmem allocator Mina Almasry
2024-08-06 20:47 ` Jakub Kicinski
2024-08-05 21:25 ` [PATCH net-next v18 05/14] page_pool: move dmaddr helpers to .c file Mina Almasry
2024-08-06 20:42 ` Jakub Kicinski
2024-08-05 21:25 ` [PATCH net-next v18 06/14] page_pool: devmem support Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 07/14] memory-provider: dmabuf devmem memory provider Mina Almasry
2024-08-06 20:59 ` Jakub Kicinski
2024-08-08 20:36 ` Mina Almasry
2024-08-09 2:24 ` Jakub Kicinski
2024-08-09 14:10 ` Mina Almasry
2024-08-09 15:45 ` Pavel Begunkov
2024-08-10 3:52 ` Jakub Kicinski
2024-08-11 2:21 ` Mina Almasry
2024-08-11 21:51 ` Pavel Begunkov
2024-08-12 17:57 ` Jakub Kicinski
2024-08-12 18:55 ` Mina Almasry
2024-08-12 19:10 ` Pavel Begunkov
2024-08-12 23:57 ` Jakub Kicinski [this message]
2024-08-13 2:31 ` Pavel Begunkov
2024-08-13 14:39 ` Jakub Kicinski
2024-08-13 15:11 ` Pavel Begunkov
2024-08-13 15:26 ` Jakub Kicinski
2024-08-12 18:57 ` Pavel Begunkov
2024-08-12 19:04 ` Pavel Begunkov
2024-08-13 0:15 ` Jakub Kicinski
2024-08-13 1:56 ` Pavel Begunkov
2024-08-13 8:39 ` Mina Almasry
2024-08-13 9:03 ` Mina Almasry
2024-08-13 14:33 ` Jakub Kicinski
2024-08-05 21:25 ` [PATCH net-next v18 08/14] net: support non paged skb frags Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 09/14] net: add support for skbs with unreadable frags Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 10/14] tcp: RX path for devmem TCP Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 11/14] net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 12/14] net: add devmem TCP documentation Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 13/14] selftests: add ncdevmem, netcat for devmem TCP Mina Almasry
2024-08-05 21:25 ` [PATCH net-next v18 14/14] netdev: add dmabuf introspection Mina Almasry
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