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From: Akihiko Odaki <akihiko.odaki@daynix.com>
Date: Thu, 13 Mar 2025 15:55:28 +0900
Subject: [PATCH RFC v4 02/11] net/vhost-vdpa: Report hashing capability
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To: qemu-devel@nongnu.org, Yuri Benditovich <yuri.benditovich@daynix.com>,
Andrew Melnychenko <andrew@daynix.com>,
"Michael S . Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>,
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Report hashing capability so that virtio-net can deliver the correct
capability information to the guest.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
include/net/net.h | 3 +++
net/net.c | 9 +++++++++
net/vhost-vdpa.c | 28 ++++++++++++++++++++++++++++
3 files changed, 40 insertions(+)
diff --git a/include/net/net.h b/include/net/net.h
index cdd5b109b0d2..545f4339cec8 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -60,6 +60,7 @@ typedef bool (HasVnetHdrLen)(NetClientState *, int);
typedef void (SetOffload)(NetClientState *, int, int, int, int, int, int, =
int);
typedef int (GetVnetHdrLen)(NetClientState *);
typedef void (SetVnetHdrLen)(NetClientState *, int);
+typedef bool (GetVnetHashSupportedTypes)(NetClientState *, uint32_t *);
typedef int (SetVnetLE)(NetClientState *, bool);
typedef int (SetVnetBE)(NetClientState *, bool);
typedef struct SocketReadState SocketReadState;
@@ -89,6 +90,7 @@ typedef struct NetClientInfo {
SetVnetHdrLen *set_vnet_hdr_len;
SetVnetLE *set_vnet_le;
SetVnetBE *set_vnet_be;
+ GetVnetHashSupportedTypes *get_vnet_hash_supported_types;
NetAnnounce *announce;
SetSteeringEBPF *set_steering_ebpf;
NetCheckPeerType *check_peer_type;
@@ -189,6 +191,7 @@ void qemu_set_offload(NetClientState *nc, int csum, int=
tso4, int tso6,
int ecn, int ufo, int uso4, int uso6);
int qemu_get_vnet_hdr_len(NetClientState *nc);
void qemu_set_vnet_hdr_len(NetClientState *nc, int len);
+bool qemu_get_vnet_hash_supported_types(NetClientState *nc, uint32_t *type=
s);
int qemu_set_vnet_le(NetClientState *nc, bool is_le);
int qemu_set_vnet_be(NetClientState *nc, bool is_be);
void qemu_macaddr_default_if_unset(MACAddr *macaddr);
diff --git a/net/net.c b/net/net.c
index 39d6f28158a3..d0ae3db0d864 100644
--- a/net/net.c
+++ b/net/net.c
@@ -573,6 +573,15 @@ void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
nc->info->set_vnet_hdr_len(nc, len);
}
=20
+bool qemu_get_vnet_hash_supported_types(NetClientState *nc, uint32_t *type=
s)
+{
+ if (!nc || !nc->info->get_vnet_hash_supported_types) {
+ return false;
+ }
+
+ return nc->info->get_vnet_hash_supported_types(nc, types);
+}
+
int qemu_set_vnet_le(NetClientState *nc, bool is_le)
{
#if HOST_BIG_ENDIAN
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index f7a54f46aa72..de006f3a2265 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -251,6 +251,32 @@ static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
return true;
}
=20
+static bool vhost_vdpa_get_vnet_hash_supported_types(NetClientState *nc,
+ uint32_t *types)
+{
+ assert(nc->info->type =3D=3D NET_CLIENT_DRIVER_VHOST_VDPA);
+ VhostVDPAState *s =3D DO_UPCAST(VhostVDPAState, nc, nc);
+ uint64_t features =3D s->vhost_vdpa.dev->features;
+ int fd =3D s->vhost_vdpa.shared->device_fd;
+ struct {
+ struct vhost_vdpa_config hdr;
+ uint32_t supported_hash_types;
+ } config;
+
+ if (!virtio_has_feature(features, VIRTIO_NET_F_HASH_REPORT) &&
+ !virtio_has_feature(features, VIRTIO_NET_F_RSS)) {
+ return false;
+ }
+
+ config.hdr.off =3D offsetof(struct virtio_net_config, supported_hash_t=
ypes);
+ config.hdr.len =3D sizeof(config.supported_hash_types);
+
+ assert(!ioctl(fd, VHOST_VDPA_GET_CONFIG, &config));
+ *types =3D le32_to_cpu(config.supported_hash_types);
+
+ return true;
+}
+
static bool vhost_vdpa_has_ufo(NetClientState *nc)
{
assert(nc->info->type =3D=3D NET_CLIENT_DRIVER_VHOST_VDPA);
@@ -428,6 +454,7 @@ static NetClientInfo net_vhost_vdpa_info =3D {
.stop =3D vhost_vdpa_net_client_stop,
.cleanup =3D vhost_vdpa_cleanup,
.has_vnet_hdr =3D vhost_vdpa_has_vnet_hdr,
+ .get_vnet_hash_supported_types =3D vhost_vdpa_get_vnet_hash_suppor=
ted_types,
.has_ufo =3D vhost_vdpa_has_ufo,
.check_peer_type =3D vhost_vdpa_check_peer_type,
.set_steering_ebpf =3D vhost_vdpa_set_steering_ebpf,
@@ -1301,6 +1328,7 @@ static NetClientInfo net_vhost_vdpa_cvq_info =3D {
.stop =3D vhost_vdpa_net_cvq_stop,
.cleanup =3D vhost_vdpa_cleanup,
.has_vnet_hdr =3D vhost_vdpa_has_vnet_hdr,
+ .get_vnet_hash_supported_types =3D vhost_vdpa_get_vnet_hash_supported_=
types,
.has_ufo =3D vhost_vdpa_has_ufo,
.check_peer_type =3D vhost_vdpa_check_peer_type,
.set_steering_ebpf =3D vhost_vdpa_set_steering_ebpf,
--=20
2.48.1