From: Jason Gunthorpe <jgg@ziepe.ca>
To: "Kasireddy, Vivek" <vivek.kasireddy@intel.com>
Cc: "Bobby Eshleman" <bobbyeshleman@gmail.com>,
"Donald Hunter" <donald.hunter@gmail.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Simon Horman" <horms@kernel.org>,
"Andrew Lunn" <andrew+netdev@lunn.ch>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Shuah Khan" <shuah@kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
"linaro-mm-sig@lists.linaro.org" <linaro-mm-sig@lists.linaro.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"sdf@fomichev.me" <sdf@fomichev.me>,
"razor@blackwall.org" <razor@blackwall.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"almasrymina@google.com" <almasrymina@google.com>,
"matttbe@kernel.org" <matttbe@kernel.org>,
"skhawaja@google.com" <skhawaja@google.com>,
"dw@davidwei.uk" <dw@davidwei.uk>,
"Bobby Eshleman" <bobbyeshleman@meta.com>
Subject: Re: [PATCH net-next v2 2/4] udmabuf: emit one sg entry per pinned folio
Date: Tue, 16 Jun 2026 09:40:19 -0300 [thread overview]
Message-ID: <20260616124019.GA3577091@ziepe.ca> (raw)
In-Reply-To: <IA0PR11MB71852246277F773AC41DAAA3F8E52@IA0PR11MB7185.namprd11.prod.outlook.com>
On Tue, Jun 16, 2026 at 06:04:03AM +0000, Kasireddy, Vivek wrote:
> > This is helpful for importers like net/core/devmem that expect dmabuf sg
> IMO, udmabuf needs to detect whether importers can handle segments that
> are > PAGE_SIZE and set the entries appropriately. Please look into how the
> GPU drivers and other dmabuf exporters/importers handle this situation, so
> that we can adopt best practices to address this issue.
Importers have to handle arbitary scatterlists, devmem is just broken
if it can't handle the output of sg_alloc_table_from_pages().
Jason
next prev parent reply other threads:[~2026-06-16 12:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-11 15:28 [PATCH net-next v2 0/4] net: devmem: allow rx-buf-size > PAGE_SIZE per binding Bobby Eshleman
2026-06-11 15:28 ` [PATCH net-next v2 1/4] net: devmem: allow rx-buf-size > PAGE_SIZE per dmabuf binding Bobby Eshleman
2026-06-11 21:12 ` Stanislav Fomichev
2026-06-11 15:28 ` [PATCH net-next v2 2/4] udmabuf: emit one sg entry per pinned folio Bobby Eshleman
2026-06-16 6:04 ` Kasireddy, Vivek
2026-06-16 12:40 ` Jason Gunthorpe [this message]
2026-06-11 15:28 ` [PATCH net-next v2 3/4] selftests/net: ncdevmem: add -b option to set rx-buf-size on bind Bobby Eshleman
2026-06-11 21:22 ` Stanislav Fomichev
2026-06-11 21:58 ` Bobby Eshleman
2026-06-11 15:28 ` [PATCH net-next v2 4/4] selftests/net: devmem.py: add check_rx_large_niov Bobby Eshleman
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