All of lore.kernel.org
 help / color / mirror / Atom feed
From: Rusty Russell <rusty@rustcorp.com.au>
To: Linhaifeng <haifeng.lin@huawei.com>, netdev@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: virtio-net: why not always to set avail->flags to VRING_AVAIL_F_NO_INTERRUPT
Date: Thu, 04 Jun 2015 10:43:43 +0930	[thread overview]
Message-ID: <87k2vkuvg8.fsf@rustcorp.com.au> (raw)
In-Reply-To: <556E9F87.7030202@huawei.com>

Linhaifeng <haifeng.lin@huawei.com> writes:
> Hi,
>
> I'm a newbie and have a question about vring_new_virtqueue function.
>
> Why we set avail->flags to VRING_AVAIL_F_NO_INTERRUPT when no callbacks?
> I think we should set avail->flags to VRING_AVAIL_F_NO_INTERRUPT even if no callbacks.

Hi Linhaifeng,

        Not sure I understand your question, but I'll try to answer.

We don't set VRING_AVAIL_F_NO_INTERRUPT if there's a callback because we
want that callback called.  Otherwise callback will never be used.

Cheers,
Rusty.

  reply	other threads:[~2015-06-04  1:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-03  6:32 virtio-net: why not always to set avail->flags to VRING_AVAIL_F_NO_INTERRUPT Linhaifeng
2015-06-04  1:13 ` Rusty Russell [this message]
2015-06-04  2:35   ` Linhaifeng
2015-06-04  2:35   ` Linhaifeng
2015-06-04 19:52     ` Rusty Russell
2015-06-04  1:13 ` Rusty Russell
  -- strict thread matches above, loose matches on Subject: below --
2015-06-03  6:32 Linhaifeng

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=87k2vkuvg8.fsf@rustcorp.com.au \
    --to=rusty@rustcorp.com.au \
    --cc=haifeng.lin@huawei.com \
    --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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.