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From: Akihiko Odaki <akihiko.odaki@daynix.com>
Date: Thu, 13 Mar 2025 15:55:36 +0900
Subject: [PATCH RFC v4 10/11] tap: Report virtio-net hashing support on Linux
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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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Cc: Akihiko Odaki <akihiko.odaki@daynix.com>
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This allows offloading virtio-net hashing to tap on Linux.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
net/tap-linux.h | 1 +
net/tap_int.h | 1 +
net/tap-bsd.c | 5 +++++
net/tap-linux.c | 13 +++++++++++++
net/tap-solaris.c | 5 +++++
net/tap-stub.c | 5 +++++
net/tap.c | 8 ++++++++
7 files changed, 38 insertions(+)
diff --git a/net/tap-linux.h b/net/tap-linux.h
index 5fac64c24f99..c773609c799e 100644
--- a/net/tap-linux.h
+++ b/net/tap-linux.h
@@ -32,6 +32,7 @@
#define TUNSETVNETLE _IOW('T', 220, int)
#define TUNSETVNETBE _IOW('T', 222, int)
#define TUNSETSTEERINGEBPF _IOR('T', 224, int)
+#define TUNGETVNETHASHCAP _IOR('T', 228, NetVnetHash)
#define TUNSETVNETHASH _IOW('T', 229, NetVnetHash)
=20
#endif
diff --git a/net/tap_int.h b/net/tap_int.h
index e1b53e343397..84a88841b720 100644
--- a/net/tap_int.h
+++ b/net/tap_int.h
@@ -36,6 +36,7 @@ ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxl=
en);
=20
void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp);
int tap_probe_vnet_hdr(int fd, Error **errp);
+bool tap_probe_vnet_hash_supported_types(int fd, uint32_t *types);
int tap_probe_has_ufo(int fd);
int tap_probe_has_uso(int fd);
void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int=
ufo,
diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index 2eee0c0a0ec5..142e1abe0420 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -217,6 +217,11 @@ int tap_probe_has_uso(int fd)
return 0;
}
=20
+bool tap_probe_vnet_hash_supported_types(int fd, uint32_t *types)
+{
+ return false;
+}
+
void tap_fd_set_vnet_hdr_len(int fd, int len)
{
}
diff --git a/net/tap-linux.c b/net/tap-linux.c
index c053828b056b..b45039ecbbb1 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -196,6 +196,19 @@ int tap_probe_has_uso(int fd)
return 1;
}
=20
+bool tap_probe_vnet_hash_supported_types(int fd, uint32_t *types)
+{
+ NetVnetHash hash;
+
+ if (ioctl(fd, TUNGETVNETHASHCAP, &hash)) {
+ return false;
+ }
+
+ *types =3D hash.types;
+
+ return true;
+}
+
void tap_fd_set_vnet_hdr_len(int fd, int len)
{
if (ioctl(fd, TUNSETVNETHDRSZ, &len) =3D=3D -1) {
diff --git a/net/tap-solaris.c b/net/tap-solaris.c
index c65104b84e93..00d1c850680d 100644
--- a/net/tap-solaris.c
+++ b/net/tap-solaris.c
@@ -221,6 +221,11 @@ int tap_probe_has_uso(int fd)
return 0;
}
=20
+bool tap_probe_vnet_hash_supported_types(int fd, uint32_t *types)
+{
+ return false;
+}
+
void tap_fd_set_vnet_hdr_len(int fd, int len)
{
}
diff --git a/net/tap-stub.c b/net/tap-stub.c
index 5bdc76216b7f..a4718654fbeb 100644
--- a/net/tap-stub.c
+++ b/net/tap-stub.c
@@ -52,6 +52,11 @@ int tap_probe_has_uso(int fd)
return 0;
}
=20
+bool tap_probe_vnet_hash_supported_types(int fd, uint32_t *types)
+{
+ return false;
+}
+
void tap_fd_set_vnet_hdr_len(int fd, int len)
{
}
diff --git a/net/tap.c b/net/tap.c
index 1136018c1965..98083bcd515e 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -248,6 +248,13 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, i=
nt len)
s->using_vnet_hdr =3D true;
}
=20
+static bool tap_get_vnet_hash_supported_types(NetClientState *nc,
+ uint32_t *types)
+{
+ TAPState *s =3D DO_UPCAST(TAPState, nc, nc);
+ return tap_probe_vnet_hash_supported_types(s->fd, types);
+}
+
static void tap_set_vnet_hash(NetClientState *nc, const NetVnetHash *hash)
{
TAPState *s =3D DO_UPCAST(TAPState, nc, nc);
@@ -350,6 +357,7 @@ static NetClientInfo net_tap_info =3D {
.has_vnet_hdr_len =3D tap_has_vnet_hdr_len,
.set_offload =3D tap_set_offload,
.set_vnet_hdr_len =3D tap_set_vnet_hdr_len,
+ .get_vnet_hash_supported_types =3D tap_get_vnet_hash_supported_types,
.set_vnet_hash =3D tap_set_vnet_hash,
.set_vnet_le =3D tap_set_vnet_le,
.set_vnet_be =3D tap_set_vnet_be,
--=20
2.48.1