From: Rusty Russell <rusty@rustcorp.com.au>
To: Jason Wang <jasowang@redhat.com>,
mst@redhat.com, virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: linux-api@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH net-next RFC 1/3] virtio: support for urgent descriptors
Date: Wed, 15 Oct 2014 16:10:02 +1030 [thread overview]
Message-ID: <877g01c2ml.fsf@rustcorp.com.au> (raw)
In-Reply-To: <1413011806-3813-2-git-send-email-jasowang@redhat.com>
Jason Wang <jasowang@redhat.com> writes:
> Below should be useful for some experiments Jason is doing.
> I thought I'd send it out for early review/feedback.
>
> event idx feature allows us to defer interrupts until
> a specific # of descriptors were used.
> Sometimes it might be useful to get an interrupt after
> a specific descriptor, regardless.
> This adds a descriptor flag for this, and an API
> to create an urgent output descriptor.
> This is still an RFC:
> we'll need a feature bit for drivers to detect this,
> but we've run out of feature bits for virtio 0.X.
> For experimentation purposes, drivers can assume
> this is set, or add a driver-specific feature bit.
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
The new VRING_DESC_F_URGENT bit is theoretically nicer, but for
networking (which tends to take packets in order) couldn't we just set
the event counter to give us a tx interrupt at the packet we want?
Cheers,
Rusty.
next prev parent reply other threads:[~2014-10-15 5:40 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-11 7:16 [PATCH net-next RFC 0/3] virtio-net: Conditionally enable tx interrupt Jason Wang
2014-10-11 7:16 ` [PATCH net-next RFC 1/3] virtio: support for urgent descriptors Jason Wang
2014-10-12 9:27 ` Michael S. Tsirkin
2014-10-13 6:22 ` Jason Wang
2014-10-13 7:16 ` Michael S. Tsirkin
2014-10-15 5:40 ` Rusty Russell [this message]
2014-10-17 5:23 ` Jason Wang
2014-10-11 7:16 ` [PATCH net-next RFC 2/3] vhost: support " Jason Wang
2014-10-11 7:16 ` [PATCH net-next RFC 3/3] virtio-net: conditionally enable tx interrupt Jason Wang
2014-10-11 14:48 ` Eric Dumazet
2014-10-13 6:02 ` Jason Wang
2014-10-14 21:51 ` Michael S. Tsirkin
2014-10-15 3:34 ` Jason Wang
[not found] ` <1413011806-3813-1-git-send-email-jasowang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-10-14 18:53 ` [PATCH net-next RFC 0/3] virtio-net: Conditionally " David Miller
2014-10-14 21:51 ` Michael S. Tsirkin
2014-10-15 3:24 ` Jason Wang
2014-10-14 23:06 ` Michael S. Tsirkin
2014-10-15 7:28 ` Jason Wang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=877g01c2ml.fsf@rustcorp.com.au \
--to=rusty@rustcorp.com.au \
--cc=jasowang@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mst@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).