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net: implement tunnel probing

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Tap devices support GSO over UDP tunnel offload. Probe for such
feature in a similar manner to other offloads.

GSO over UDP tunnel needs to be enabled in addition to a "plain"
offload (TSO or USO).

No need to check separately for the outer header checksum offload:
the kernel is going to support both of them or none.

The new features are disabled by default to avoid compat issues,
and could be enabled, after that hw_compat_10_1 will be added,
together with the related compat entries.

Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <a987a8a7613cbf33bb2209c7c7f5889b512638a7.1758549625.git.pabeni@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Abeni 2025-09-22 16:18:27 +02:00 • committed by Michael S. Tsirkin
parent 3a7741c3bd
commit fffac04628
10 changed files with 100 additions and 0 deletions
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3
include/net/net.h
View file

@ -65,6 +65,7 @@ typedef void (NetClientDestructor)(NetClientState *);
typedef RxFilterInfo *(QueryRxFilter)(NetClientState *);
typedef bool (HasUfo)(NetClientState *);
typedef bool (HasUso)(NetClientState *);
typedef bool (HasTunnel)(NetClientState *);
typedef bool (HasVnetHdr)(NetClientState *);
typedef bool (HasVnetHdrLen)(NetClientState *, int);
typedef void (SetOffload)(NetClientState *, const NetOffloads *);
@ -95,6 +96,7 @@ typedef struct NetClientInfo {
NetPoll *poll;
HasUfo *has_ufo;
HasUso *has_uso;
HasTunnel *has_tunnel;
HasVnetHdr *has_vnet_hdr;
HasVnetHdrLen *has_vnet_hdr_len;
SetOffload *set_offload;
@ -197,6 +199,7 @@ void qemu_set_info_str(NetClientState *nc,
void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]);
bool qemu_has_ufo(NetClientState *nc);
bool qemu_has_uso(NetClientState *nc);
bool qemu_has_tunnel(NetClientState *nc);
bool qemu_has_vnet_hdr(NetClientState *nc);
bool qemu_has_vnet_hdr_len(NetClientState *nc, int len);
void qemu_set_offload(NetClientState *nc, const NetOffloads *ol);