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Tsirkin" Cc: netdev@vger.kernel.org, linux-um@lists.infradead.org, virtualization@lists.linux-foundation.org References: <20191209104824.17059-1-anton.ivanov@cambridgegreys.com> <57230228-7030-c65f-a24f-910ca52bbe9e@cambridgegreys.com> <918222d9-816a-be70-f8af-b8dfcb586240@cambridgegreys.com> <20200211053502-mutt-send-email-mst@kernel.org> <9547228b-aa93-f2b6-6fdc-8d33cde3716a@cambridgegreys.com> From: Jason Wang Message-ID: <71193f51-9606-58ba-39d7-904bc9fbd29a@redhat.com> Date: Thu, 13 Feb 2020 11:31:38 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <9547228b-aa93-f2b6-6fdc-8d33cde3716a@cambridgegreys.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Content-Transfer-Encoding: quoted-printable Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 2020/2/13 =E4=B8=8A=E5=8D=881:38, Anton Ivanov wrote: > > > On 11/02/2020 10:37, Michael S. Tsirkin wrote: >> On Tue, Feb 11, 2020 at 07:42:37AM +0000, Anton Ivanov wrote: >>> On 11/02/2020 02:51, Jason Wang wrote: >>>> >>>> On 2020/2/11 =E4=B8=8A=E5=8D=8812:55, Anton Ivanov wrote: >>>>> >>>>> >>>>> On 09/12/2019 10:48, anton.ivanov@cambridgegreys.com wrote: >>>>>> From: Anton Ivanov >>>>>> >>>>>> Some of the frames marked as GSO which arrive at >>>>>> virtio_net_hdr_from_skb() have no GSO_TYPE, no >>>>>> fragments (data_len =3D 0) and length significantly shorter >>>>>> than the MTU (752 in my experiments). >>>>>> >>>>>> This is observed on raw sockets reading off vEth interfaces >>>>>> in all 4.x and 5.x kernels I tested. >>>>>> >>>>>> These frames are reported as invalid while they are in fact >>>>>> gso-less frames. >>>>>> >>>>>> This patch marks the vnet header as no-GSO for them instead >>>>>> of reporting it as invalid. >>>>>> >>>>>> Signed-off-by: Anton Ivanov >>>>>> --- >>>>>> =C2=A0=C2=A0 include/linux/virtio_net.h | 8 ++++++-- >>>>>> =C2=A0=C2=A0 1 file changed, 6 insertions(+), 2 deletions(-) >>>>>> >>>>>> diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net= .h >>>>>> index 0d1fe9297ac6..d90d5cff1b9a 100644 >>>>>> --- a/include/linux/virtio_net.h >>>>>> +++ b/include/linux/virtio_net.h >>>>>> @@ -112,8 +112,12 @@ static inline int >>>>>> virtio_net_hdr_from_skb(const struct sk_buff *skb, >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 hdr->gso_type =3D VIRTIO_NET_HDR_GSO_TCPV4; >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else = if (sinfo->gso_type & SKB_GSO_TCPV6) >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 hdr->gso_type =3D VIRTIO_NET_HDR_GSO_TCPV6; >>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else >>>>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= return -EINVAL; >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else { >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= if (skb->data_len =3D=3D 0) >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 hdr->gso_type =3D VIRTIO_NET_HDR_GSO_NONE; >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= else >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 return -EINVAL; >>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (s= info->gso_type & SKB_GSO_TCP_ECN) >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 hdr->gso_type |=3D VIRTIO_NET_HDR_GSO_ECN; >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } else >>>>>> >>>>> >>>>> ping. >>>>> >>>> >>>> Do you mean gso_size is set but gso_type is not? Looks like a bug >>>> elsewhere. >>>> >>>> Thanks >>>> >>>> >>> Yes. >>> >>> I could not trace it where it is coming from. >>> >>> I see it when doing recvmmsg on raw sockets in the UML vector network >>> drivers. >>> >> >> I think we need to find the culprit and fix it there, lots of other=20 >> things >> can break otherwise. >> Just printing out skb->dev->name should do the trick, no? > > The printk in virtio_net_hdr_from_skb says NULL. > > That is probably normal for a locally originated frame. > > I cannot reproduce this with network traffic by the way - it happens=20 > only if the traffic is locally originated on the host. > > A, Or maybe you can try add dump_stack() there. Thanks