From: "Michael S. Tsirkin" <mst@redhat.com> To: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Cc: virtualization@lists.linux-foundation.org, Network Development <netdev@vger.kernel.org>, Jason Wang <jasowang@redhat.com> Subject: Re: [PATCH rfc 2/3] virtio-net: support receive timestamp Date: Mon, 28 Dec 2020 16:32:48 -0500 [thread overview] Message-ID: <20201228162903-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <CA+FuTScguDWkvk=Lc+GzP=UCK2wjRFNJ_GEn_bniHpCDWdkfjg@mail.gmail.com> On Mon, Dec 28, 2020 at 02:30:31PM -0500, Willem de Bruijn wrote: > On Mon, Dec 28, 2020 at 12:29 PM Michael S. Tsirkin <mst@redhat.com> wrote: > > > > On Mon, Dec 28, 2020 at 11:22:32AM -0500, Willem de Bruijn wrote: > > > From: Willem de Bruijn <willemb@google.com> > > > > > > Add optional PTP hardware timestamp offload for virtio-net. > > > > > > Accurate RTT measurement requires timestamps close to the wire. > > > Introduce virtio feature VIRTIO_NET_F_RX_TSTAMP. If negotiated, the > > > virtio-net header is expanded with room for a timestamp. A host may > > > pass receive timestamps for all or some packets. A timestamp is valid > > > if non-zero. > > > > > > The timestamp straddles (virtual) hardware domains. Like PTP, use > > > international atomic time (CLOCK_TAI) as global clock base. It is > > > guest responsibility to sync with host, e.g., through kvm-clock. > > > > > > Signed-off-by: Willem de Bruijn <willemb@google.com> > > > diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h > > > index f6881b5b77ee..0ffe2eeebd4a 100644 > > > --- a/include/uapi/linux/virtio_net.h > > > +++ b/include/uapi/linux/virtio_net.h > > > @@ -57,6 +57,7 @@ > > > * Steering */ > > > #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ > > > > > > +#define VIRTIO_NET_F_RX_TSTAMP 55 /* Host sends TAI receive time */ > > > #define VIRTIO_NET_F_TX_HASH 56 /* Guest sends hash report */ > > > #define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */ > > > #define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */ > > > @@ -182,6 +183,17 @@ struct virtio_net_hdr_v1_hash { > > > }; > > > }; > > > > > > +struct virtio_net_hdr_v12 { > > > + struct virtio_net_hdr_v1 hdr; > > > + struct { > > > + __le32 value; > > > + __le16 report; > > > + __le16 flow_state; > > > + } hash; > > > + __virtio32 reserved; > > > + __virtio64 tstamp; > > > +}; > > > + > > > #ifndef VIRTIO_NET_NO_LEGACY > > > /* This header comes first in the scatter-gather list. > > > * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must > > > > > > So it looks like VIRTIO_NET_F_RX_TSTAMP should depend on both > > VIRTIO_NET_F_RX_TSTAMP and VIRTIO_NET_F_HASH_REPORT then? > > Do you mean VIRTIO_NET_F_TX_TSTAMP depends on VIRTIO_NET_F_RX_TSTAMP? > > I think if either is enabled we need to enable the extended layout. > Regardless of whether TX_HASH or HASH_REPORT are enabled. If they are > not, then those fields are ignored. I mean do we waste the 8 bytes for hash if TSTAMP is set but HASH is not? If TSTAMP depends on HASH then point is moot. > > I am not sure what does v12 mean here. > > > > virtio_net_hdr_v1 is just with VIRTIO_F_VERSION_1, > > virtio_net_hdr_v1_hash is with VIRTIO_F_VERSION_1 and > > VIRTIO_NET_F_HASH_REPORT. > > > > So this one is virtio_net_hdr_hash_tstamp I guess? > > Sounds better, yes, will change that. > > This was an attempt at identifying the layout with the likely next > generation of the spec, 1.2. Similar to virtio_net_hdr_v1. But that is > both premature and not very helpful.
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com> To: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Cc: Network Development <netdev@vger.kernel.org>, virtualization@lists.linux-foundation.org Subject: Re: [PATCH rfc 2/3] virtio-net: support receive timestamp Date: Mon, 28 Dec 2020 16:32:48 -0500 [thread overview] Message-ID: <20201228162903-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <CA+FuTScguDWkvk=Lc+GzP=UCK2wjRFNJ_GEn_bniHpCDWdkfjg@mail.gmail.com> On Mon, Dec 28, 2020 at 02:30:31PM -0500, Willem de Bruijn wrote: > On Mon, Dec 28, 2020 at 12:29 PM Michael S. Tsirkin <mst@redhat.com> wrote: > > > > On Mon, Dec 28, 2020 at 11:22:32AM -0500, Willem de Bruijn wrote: > > > From: Willem de Bruijn <willemb@google.com> > > > > > > Add optional PTP hardware timestamp offload for virtio-net. > > > > > > Accurate RTT measurement requires timestamps close to the wire. > > > Introduce virtio feature VIRTIO_NET_F_RX_TSTAMP. If negotiated, the > > > virtio-net header is expanded with room for a timestamp. A host may > > > pass receive timestamps for all or some packets. A timestamp is valid > > > if non-zero. > > > > > > The timestamp straddles (virtual) hardware domains. Like PTP, use > > > international atomic time (CLOCK_TAI) as global clock base. It is > > > guest responsibility to sync with host, e.g., through kvm-clock. > > > > > > Signed-off-by: Willem de Bruijn <willemb@google.com> > > > diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h > > > index f6881b5b77ee..0ffe2eeebd4a 100644 > > > --- a/include/uapi/linux/virtio_net.h > > > +++ b/include/uapi/linux/virtio_net.h > > > @@ -57,6 +57,7 @@ > > > * Steering */ > > > #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ > > > > > > +#define VIRTIO_NET_F_RX_TSTAMP 55 /* Host sends TAI receive time */ > > > #define VIRTIO_NET_F_TX_HASH 56 /* Guest sends hash report */ > > > #define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */ > > > #define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */ > > > @@ -182,6 +183,17 @@ struct virtio_net_hdr_v1_hash { > > > }; > > > }; > > > > > > +struct virtio_net_hdr_v12 { > > > + struct virtio_net_hdr_v1 hdr; > > > + struct { > > > + __le32 value; > > > + __le16 report; > > > + __le16 flow_state; > > > + } hash; > > > + __virtio32 reserved; > > > + __virtio64 tstamp; > > > +}; > > > + > > > #ifndef VIRTIO_NET_NO_LEGACY > > > /* This header comes first in the scatter-gather list. > > > * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must > > > > > > So it looks like VIRTIO_NET_F_RX_TSTAMP should depend on both > > VIRTIO_NET_F_RX_TSTAMP and VIRTIO_NET_F_HASH_REPORT then? > > Do you mean VIRTIO_NET_F_TX_TSTAMP depends on VIRTIO_NET_F_RX_TSTAMP? > > I think if either is enabled we need to enable the extended layout. > Regardless of whether TX_HASH or HASH_REPORT are enabled. If they are > not, then those fields are ignored. I mean do we waste the 8 bytes for hash if TSTAMP is set but HASH is not? If TSTAMP depends on HASH then point is moot. > > I am not sure what does v12 mean here. > > > > virtio_net_hdr_v1 is just with VIRTIO_F_VERSION_1, > > virtio_net_hdr_v1_hash is with VIRTIO_F_VERSION_1 and > > VIRTIO_NET_F_HASH_REPORT. > > > > So this one is virtio_net_hdr_hash_tstamp I guess? > > Sounds better, yes, will change that. > > This was an attempt at identifying the layout with the likely next > generation of the spec, 1.2. Similar to virtio_net_hdr_v1. But that is > both premature and not very helpful. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2020-12-28 23:17 UTC|newest] Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-28 16:22 [PATCH rfc 0/3] virtio-net: add tx-hash, rx-tstamp and tx-tstamp Willem de Bruijn 2020-12-28 16:22 ` Willem de Bruijn 2020-12-28 16:22 ` [PATCH rfc 1/3] virtio-net: support transmit hash report Willem de Bruijn 2020-12-28 16:22 ` Willem de Bruijn 2020-12-28 16:28 ` Michael S. Tsirkin 2020-12-28 16:28 ` Michael S. Tsirkin 2020-12-28 16:47 ` Willem de Bruijn 2020-12-28 16:47 ` Willem de Bruijn 2020-12-28 17:22 ` Michael S. Tsirkin 2020-12-28 17:22 ` Michael S. Tsirkin 2020-12-29 1:19 ` Willem de Bruijn 2020-12-29 1:19 ` Willem de Bruijn 2020-12-28 21:36 ` Michael S. Tsirkin 2020-12-28 21:36 ` Michael S. Tsirkin 2020-12-29 1:23 ` Willem de Bruijn 2020-12-29 1:23 ` Willem de Bruijn 2020-12-28 16:22 ` [PATCH rfc 2/3] virtio-net: support receive timestamp Willem de Bruijn 2020-12-28 16:22 ` Willem de Bruijn 2020-12-28 17:28 ` Michael S. Tsirkin 2020-12-28 17:28 ` Michael S. Tsirkin 2020-12-28 19:30 ` Willem de Bruijn 2020-12-28 19:30 ` Willem de Bruijn 2020-12-28 21:32 ` Michael S. Tsirkin [this message] 2020-12-28 21:32 ` Michael S. Tsirkin 2020-12-29 1:05 ` Willem de Bruijn 2020-12-29 1:05 ` Willem de Bruijn 2020-12-29 9:17 ` Jason Wang 2020-12-29 9:17 ` Jason Wang 2020-12-29 14:20 ` Willem de Bruijn 2020-12-29 14:20 ` Willem de Bruijn 2020-12-30 8:38 ` Jason Wang 2020-12-30 8:38 ` Jason Wang 2020-12-28 22:59 ` Jakub Kicinski 2020-12-29 0:57 ` Willem de Bruijn 2020-12-29 0:57 ` Willem de Bruijn 2020-12-30 8:44 ` Jason Wang 2020-12-30 8:44 ` Jason Wang 2020-12-30 12:30 ` Richard Cochran 2021-02-02 13:05 ` kernel test robot 2021-02-02 13:05 ` kernel test robot 2021-02-02 13:05 ` kernel test robot 2021-02-02 14:08 ` Michael S. Tsirkin 2021-02-02 14:08 ` Michael S. Tsirkin 2021-02-02 22:17 ` Willem de Bruijn 2021-02-02 22:17 ` Willem de Bruijn 2021-02-02 23:02 ` Michael S. Tsirkin 2021-02-02 23:02 ` Michael S. Tsirkin 2021-02-02 23:43 ` Willem de Bruijn 2021-02-02 23:43 ` Willem de Bruijn 2020-12-28 16:22 ` [PATCH rfc 3/3] virtio-net: support transmit timestamp Willem de Bruijn 2020-12-28 16:22 ` Willem de Bruijn 2020-12-30 12:38 ` Richard Cochran 2020-12-30 15:25 ` Willem de Bruijn 2020-12-30 15:25 ` Willem de Bruijn 2021-02-02 13:47 ` kernel test robot 2021-02-02 13:47 ` kernel test robot 2021-02-02 13:47 ` kernel test robot 2020-12-28 17:29 ` [PATCH rfc 0/3] virtio-net: add tx-hash, rx-tstamp and tx-tstamp Michael S. Tsirkin 2020-12-28 17:29 ` Michael S. Tsirkin 2020-12-28 19:51 ` Willem de Bruijn 2020-12-28 19:51 ` Willem de Bruijn 2020-12-28 21:38 ` Michael S. Tsirkin 2020-12-28 21:38 ` Michael S. Tsirkin 2020-12-29 1:14 ` Willem de Bruijn 2020-12-29 1:14 ` Willem de Bruijn 2021-01-06 20:32 ` Willem de Bruijn 2021-01-06 20:32 ` Willem de Bruijn
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