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vhost-user: Add MTU protocol feature and op

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This patch implements VHOST_USER_PROTOCOL_F_NET_MTU
protocol feature and VHOST_USER_NET_SET_MTU request so
that the backend gets notified of the user defined host
MTU.

If backend supports VHOST_USER_PROTOCOL_F_REPLY_ACK,
QEMU assumes MTU is valid if success is returned.

Vhost-net driver sends this request through a new
vhost_net_set_mtu vhost_ops entry.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Aaron Conole <aconole@redhat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Maxime Coquelin 2016-12-10 16:30:36 +01:00 • committed by Michael S. Tsirkin
parent 283e2c2adc
commit c5f048d8fb
3 changed files with 52 additions and 0 deletions
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16
docs/specs/vhost-user.txt
View file

@ -259,6 +259,7 @@ Protocol features
#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1
#define VHOST_USER_PROTOCOL_F_RARP 2
#define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
#define VHOST_USER_PROTOCOL_F_MTU 4
Message types
-------------
@ -470,6 +471,21 @@ Message types
The first 6 bytes of the payload contain the mac address of the guest to
allow the vhost user backend to construct and broadcast the fake RARP.
* VHOST_USER_NET_SET_MTU
Id: 20
Equivalent ioctl: N/A
Master payload: u64
Set host MTU value exposed to the guest.
This request should be sent only when VIRTIO_NET_F_MTU feature has been
successfully negotiated, VHOST_USER_F_PROTOCOL_FEATURES is present in
VHOST_USER_GET_FEATURES and protocol feature bit
VHOST_USER_PROTOCOL_F_NET_MTU is present in
VHOST_USER_GET_PROTOCOL_FEATURES.
If VHOST_USER_PROTOCOL_F_REPLY_ACK is negotiated, slave must respond
with zero in case the specified MTU is valid, or non-zero otherwise.
VHOST_USER_PROTOCOL_F_REPLY_ACK:
-------------------------------
The original vhost-user specification only demands replies for certain