From: Jason Wang <jasowang@redhat.com>
To: Yuri Benditovich <yuri.benditovich@daynix.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
"Michael S . Tsirkin" <mst@redhat.com>,
Network Development <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
Yan Vugenfirer <yan@daynix.com>
Subject: Re: [PATCH 4/4] tun: indicate support for USO feature
Date: Wed, 12 May 2021 09:33:14 +0800 [thread overview]
Message-ID: <89759261-3a72-df6c-7a81-b7a48abfad44@redhat.com> (raw)
In-Reply-To: <CAOEp5OdrCDPx4ijLcEOm=Wxma6hc=nyqw4Xm6bggBxvgtR0tbg@mail.gmail.com>
在 2021/5/11 下午4:33, Yuri Benditovich 写道:
> On Tue, May 11, 2021 at 9:50 AM Jason Wang <jasowang@redhat.com> wrote:
>>
>> 在 2021/5/11 下午12:42, Yuri Benditovich 写道:
>>> Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
>>> ---
>>> drivers/net/tun.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
>>> index 84f832806313..a35054f9d941 100644
>>> --- a/drivers/net/tun.c
>>> +++ b/drivers/net/tun.c
>>> @@ -2812,7 +2812,7 @@ static int set_offload(struct tun_struct *tun, unsigned long arg)
>>> arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
>>> }
>>>
>>> - arg &= ~TUN_F_UFO;
>>> + arg &= ~(TUN_F_UFO|TUN_F_USO);
>>
>> It looks to me kernel doesn't use "USO", so TUN_F_UDP_GSO_L4 is a better
>> name for this
> No problem, I can change it in v2
>
> and I guess we should toggle NETIF_F_UDP_GSO_l4 here?
>
> No, we do not, because this indicates only the fact that the guest can
> send large UDP packets and have them splitted to UDP segments.
Actually the reverse. The set_offload() controls the tuntap TX path
(guest RX path).
When VIRTIO_NET_F_GUEST_XXX was not negotiated, the corresponding netdev
features needs to be disabled. When host tries to send those packets to
guest, it needs to do software segmentation.
See virtio_net_apply_guest_offloads().
There's currently no way (or not need) to prevent tuntap from receiving
GSO packets.
Thanks
>
>> And how about macvtap?
> We will check how to do that for macvtap. We will send a separate
> patch for macvtap or ask for advice.
>
>> Thanks
>>
>>
>>> }
>>>
>>> /* This gives the user a way to test for new features in future by
next prev parent reply other threads:[~2021-05-12 1:33 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 4:42 [PATCH 0/4] Add host USO support to TUN device Yuri Benditovich
2021-05-11 4:42 ` [PATCH 1/4] virtio-net: add definitions for host USO feature Yuri Benditovich
2021-05-11 6:47 ` Jason Wang
2021-05-11 8:12 ` Yuri Benditovich
2021-05-11 8:24 ` Jason Wang
2021-05-11 9:21 ` Yuri Benditovich
2021-05-12 1:21 ` Jason Wang
2021-05-11 4:42 ` [PATCH 2/4] virtio-net: add support of UDP segmentation (USO) on the host Yuri Benditovich
2021-05-11 6:47 ` Jason Wang
2021-05-11 8:23 ` Yuri Benditovich
2021-05-11 8:31 ` Jason Wang
2021-05-11 17:47 ` Willem de Bruijn
2021-05-12 6:09 ` Yuri Benditovich
2021-05-12 14:32 ` Willem de Bruijn
2021-05-12 18:56 ` Yuri Benditovich
2021-05-12 19:53 ` Willem de Bruijn
2021-05-11 4:42 ` [PATCH 3/4] tun: define feature bit for USO support Yuri Benditovich
2021-05-11 4:42 ` [PATCH 4/4] tun: indicate support for USO feature Yuri Benditovich
2021-05-11 6:50 ` Jason Wang
2021-05-11 8:33 ` Yuri Benditovich
2021-05-11 19:06 ` Yuri Benditovich
2021-05-12 1:33 ` Jason Wang [this message]
2021-05-12 5:24 ` Yuri Benditovich
[not found] ` <CACGkMEsZBCzV+d_eLj1aYT+pkS5m1QAy7q8rUkNsdV0C8aL8tQ@mail.gmail.com>
[not found] ` <CAOEp5OeSankfA6urXLW_fquSMrZ+WYXDtKNacort1UwR=WgxqA@mail.gmail.com>
[not found] ` <CACGkMEt3bZrdqbWtWjSkXvv5v8iCHiN8hkD3T602RZnb6nPd9A@mail.gmail.com>
[not found] ` <CAOEp5Odw=eaQWZCXr+U8PipPtO1Avjw-t3gEdKyvNYxuNa5TfQ@mail.gmail.com>
[not found] ` <CACGkMEuqXaJxGqC+CLoq7k4XDu+W3E3Kk3WvG-D6tnn2K4ZPNA@mail.gmail.com>
[not found] ` <CAOEp5OfB62SQzxMj_GkVD4EM=Z+xf43TPoTZwMbPPa3BsX2ooA@mail.gmail.com>
2021-05-13 7:04 ` Jason Wang
2021-05-13 8:14 ` Yuri Benditovich
2021-05-13 20:43 ` Willem de Bruijn
2021-05-14 5:48 ` Yuri Benditovich
2021-05-13 20:34 ` Willem de Bruijn
2021-05-14 7:16 ` Jason Wang
2021-05-14 7:38 ` Yuri Benditovich
2021-05-14 12:41 ` Willem de Bruijn
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=89759261-3a72-df6c-7a81-b7a48abfad44@redhat.com \
--to=jasowang@redhat.com \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mst@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=virtualization@lists.linux-foundation.org \
--cc=yan@daynix.com \
--cc=yuri.benditovich@daynix.com \
/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).