From: Dmitry Fleytman <dfleytma@xxxxxxxxxx> Virtio-net driver currently negotiates network offloads on startup via features mechanism and have no ability to change offloads state later. This patch introduced a new control command that allows to configure device network offloads state dynamically. The patch also introduces a new feature flag VIRTIO_NET_F_CTRL_GUEST_OFFLD. Signed-off-by: Dmitry Fleytman <dfleytma@xxxxxxxxxx> --- virtio-spec.lyx | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 143 insertions(+) diff --git a/virtio-spec.lyx b/virtio-spec.lyx index 3d2f485..cdc4320 100644 --- a/virtio-spec.lyx +++ b/virtio-spec.lyx @@ -60,6 +60,7 @@ \author -1930653948 "Amos Kong" \author -608949062 "Rusty Russell,,," \author -385801441 "Cornelia Huck" cornelia.huck@xxxxxxxxxx +\author 460276516 "Dmitry Fleytman" dfleytma@xxxxxxxxxx \author 1112500848 "Rusty Russell" rusty@xxxxxxxxxxxxxxx \author 1531152142 "Paolo Bonzini,,," \author 1717892615 "Alexey Zaytsev,,," @@ -4261,6 +4262,20 @@ VIRTIO_NET_F_GUEST_CSUM \end_inset (1) Guest handles packets with partial checksum +\change_inserted 460276516 1363712169 + +\end_layout + +\begin_layout Description + +\change_inserted 460276516 1363712334 +VIRTIO_NET_F_CTRL_GUEST_OFFLD +\begin_inset space ~ +\end_inset + +(2) Control channel offloads reconfiguration support. +\change_unchanged + \end_layout \begin_layout Description @@ -5675,6 +5690,134 @@ virtqueue_pairs = 1 \end_layout +\begin_layout Subsection* + +\change_inserted 460276516 1363765850 +Offloads State Configuration +\end_layout + +\begin_layout Standard + +\change_inserted 460276516 1363765861 +If the VIRTIO_NET_F_CTRL_GUEST_OFFLD feature is negotiated, the driver can + send control commands for dynamic offloads state configuration. +\end_layout + +\begin_layout Subsubsection* + +\change_inserted 460276516 1363765928 +Setting offloads state +\end_layout + +\begin_layout Standard + +\change_inserted 460276516 1363713225 +\begin_inset listings +inline false +status open + +\begin_layout Plain Layout + +\change_inserted 460276516 1363765996 + +u32 offloads; +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363765997 + +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363766044 + +#define VIRTIO_NET_OFFLOAD_GUEST_CSUM 1 +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363766051 + +#define VIRTIO_NET_OFFLOAD_GUEST_TSO4 2 +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363766055 + +#define VIRTIO_NET_OFFLOAD_GUEST_TSO6 4 +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363766064 + +#define VIRTIO_NET_OFFLOAD_GUEST_ECN 8 +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363766035 + +#define VIRTIO_NET_OFFLOAD_GUEST_UFO 16 +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363766031 + +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363765865 + +#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5 +\end_layout + +\begin_layout Plain Layout + +\change_inserted 460276516 1363765867 + + #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0 +\end_layout + +\end_inset + + +\end_layout + +\begin_layout Standard + +\change_inserted 460276516 1363766082 +The class VIRTIO_NET_CTRL_GUEST_OFFLOADS has one command: VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET + applies the new offloads configuration. +\end_layout + +\begin_layout Standard + +\change_inserted 460276516 1363766435 +u32 value passed as command data is a bitmask, bits set define offloads + to be enabled, bits cleared - offloads to be disabled. +\end_layout + +\begin_layout Standard + +\change_inserted 460276516 1363766757 +There is a corresponding device feature for each offload. + Upon feature negotiation corresponding offload gets enabled to preserve + backward compartibility. +\end_layout + +\begin_layout Standard + +\change_inserted 460276516 1363766720 +Corresponding feature must be negotiated at startup in order to allow dynamic + change of specific offload state. +\end_layout + \begin_layout Chapter* Appendix D: Block Device \end_layout -- 1.8.1.4 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
