From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jason Wang <jasowang@redhat.com>
Cc: "Vishwanath Seshagiri" <vishs@meta.com>,
"Xuan Zhuo" <xuanzhuo@linux.alibaba.com>,
"Eugenio Pérez" <eperezma@redhat.com>,
"Andrew Lunn" <andrew+netdev@lunn.ch>,
"David S . Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>, "David Wei" <dw@davidwei.uk>,
netdev@vger.kernel.org, virtualization@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] virtio_net: add page pool support for buffer allocation
Date: Fri, 9 Jan 2026 01:50:33 -0500 [thread overview]
Message-ID: <20260109014836-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CACGkMEuChs5WHg5916e=odvLU09r8ER-1+VXi5rp+LLo0s6UUg@mail.gmail.com>
On Fri, Jan 09, 2026 at 11:16:39AM +0800, Jason Wang wrote:
> > My concern was that virtio has its own DMA abstraction
> > vdev->map->map_page() (used by VDUSE), and I wasn't sure if page_pool's
> > standard dma_map_page() would be compatible with all virtio backends.
>
> You are right, DMA is unware about virtio mappings, so we can't use that.
Or maybe we could add an API saying whether virtio mappings are DMA ones
and then enable that conditionally? Because on some platforms, mapping
in the pool can save *a lot* of cycles.
--
MST
next prev parent reply other threads:[~2026-01-09 6:50 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-06 22:19 [PATCH 0/2] virtio_net: add page_pool support Vishwanath Seshagiri
2026-01-06 22:19 ` [PATCH 1/2] virtio_net: add page pool support for buffer allocation Vishwanath Seshagiri
2026-01-07 3:49 ` Xuan Zhuo
2026-01-07 18:41 ` Vishwanath Seshagiri
2026-01-08 3:16 ` Jason Wang
2026-01-08 6:23 ` Vishwanath Seshagiri
2026-01-09 3:16 ` Jason Wang
2026-01-09 6:50 ` Michael S. Tsirkin [this message]
2026-01-09 20:36 ` Vishwanath Seshagiri
2026-01-10 1:57 ` Vishwanath Seshagiri
2026-01-12 3:15 ` Jason Wang
2026-01-06 22:19 ` [PATCH 2/2] selftests: virtio_net: add buffer circulation test Vishwanath Seshagiri
2026-01-07 8:28 ` [PATCH 0/2] virtio_net: add page_pool support Michael S. Tsirkin
2026-01-08 5:23 ` Vishwanath Seshagiri
2026-01-28 20:19 ` Michael S. Tsirkin
2026-01-28 20:27 ` Vishwanath Seshagiri
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