diff options
| author | rusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2013-08-16 03:20:21 +0000 |
|---|---|---|
| committer | rusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2013-08-16 03:20:21 +0000 |
| commit | 6c9d2f4d76647a588cb173c1a847443b04aa8be7 (patch) | |
| tree | 542b1309b975ae9f5e750be9a3632371ec8ca510 | |
| parent | 69fbbac976180a38519d2319c7927ec09b746119 (diff) | |
As submitted to virtio-comment list: https://lists.oasis-open.org/archives/virtio-comment/201308/msg00009.html
(Edited into plain text)
From: Dmitry Fleytman <dfleytma@redhat.com>
Virtio-net driver currently negotiates network offloads
on startup via features mechanism and have no ability to
disable and re-enable offloads 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_OFFLOADS.
Signed-off-by: Dmitry Fleytman <dfleytma@redhat.com>
Signed-off-by: Rusty Russell <rusty@au1.ibm.com>
git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@14 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
| -rw-r--r-- | virtio-spec.txt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/virtio-spec.txt b/virtio-spec.txt index d762461..a3ee054 100644 --- a/virtio-spec.txt +++ b/virtio-spec.txt @@ -1132,6 +1132,9 @@ features. VIRTIO_NET_F_GUEST_CSUM (1) Guest handles packets with partial checksum + VIRTIO_NET_F_CTRL_GUEST_OFFLOADS (2) Control channel offloads + reconfiguration support. + VIRTIO_NET_F_MAC (5) Device has given MAC address. VIRTIO_NET_F_GSO (6) (Deprecated) device handles packets with @@ -1473,6 +1476,38 @@ Processing this notification involves: 2. Sending VIRTIO_NET_CTRL_ANNOUNCE_ACK command through control vq. +2.5.1.5.3.4 Offloads State Configuration + +If the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature is negotiated, the driver can +send control commands for dynamic offloads state configuration. + +2.5.1.5.4.3.1 Setting Offloads State + + u64 offloads; + + #define VIRTIO_NET_F_GUEST_CSUM 1 + #define VIRTIO_NET_F_GUEST_TSO4 7 + #define VIRTIO_NET_F_GUEST_TSO6 8 + #define VIRTIO_NET_F_GUEST_ECN 9 + #define VIRTIO_NET_F_GUEST_UFO 10 + + #define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5 + #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0 + +The class VIRTIO_NET_CTRL_GUEST_OFFLOADS has one command: +VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET applies the new offloads configuration. + +u64 value passed as command data is a bitmask, bits set define +offloads to be enabled, bits cleared - offloads to be disabled. + +There is a corresponding device feature for each offload. Upon feature +negotiation corresponding offload gets enabled to preserve backward +compartibility. + +Corresponding feature must be negotiated at startup in order to allow dynamic +change of specific offload state. + + 2.5.2 Block Device ================== |