[PATCH RFC v5 4/5] tap: Report virtio-net hashing support on Linux

[Akihiko Odaki <akihiko.odaki@daynix.com>]

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   | 5 +++++
 net/tap-solaris.c | 5 +++++
 net/tap-stub.c    | 5 +++++
 net/tap.c         | 8 ++++++++
 7 files changed, 30 insertions(+)

diff --git a/net/tap-linux.h b/net/tap-linux.h
index 5bca6cab1867..fe30f4f27788 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 TUNGETVNETHASHTYPES _IOR('T', 228, __u32)
 #define TUNSETVNETREPORTINGAUTOMQ _IOR('T', 229, __u32)
 #define TUNSETVNETREPORTINGRSS _IOR('T', 230, NetVnetRss)
 #define TUNSETVNETRSS _IOR('T', 231, struct NetVnetRss)
diff --git a/net/tap_int.h b/net/tap_int.h
index 248d1efa51a0..5ff9ca721928 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 maxlen);
 
 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 8ed384f02c5b..749732138502 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -217,6 +217,11 @@ int tap_probe_has_uso(int fd)
     return 0;
 }
 
+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 d0adb168e977..76fc88acaa18 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -196,6 +196,11 @@ int tap_probe_has_uso(int fd)
     return 1;
 }
 
+bool tap_probe_vnet_hash_supported_types(int fd, uint32_t *types)
+{
+    return !ioctl(fd, TUNGETVNETHASHTYPES, types);
+}
+
 void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
     if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {
diff --git a/net/tap-solaris.c b/net/tap-solaris.c
index bc76a030e7f9..65234c49a196 100644
--- a/net/tap-solaris.c
+++ b/net/tap-solaris.c
@@ -221,6 +221,11 @@ int tap_probe_has_uso(int fd)
     return 0;
 }
 
+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 511ddfc707eb..281bae2615d2 100644
--- a/net/tap-stub.c
+++ b/net/tap-stub.c
@@ -52,6 +52,11 @@ int tap_probe_has_uso(int fd)
     return 0;
 }
 
+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 e93f5f951057..4a8adcf447eb 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -248,6 +248,13 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
     s->using_vnet_hdr = true;
 }
 
+static bool tap_get_vnet_hash_supported_types(NetClientState *nc,
+                                              uint32_t *types)
+{
+    TAPState *s = DO_UPCAST(TAPState, nc, nc);
+    return tap_probe_vnet_hash_supported_types(s->fd, types);
+}
+
 static void tap_set_vnet_automq(NetClientState *nc, uint32_t hash_types)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
@@ -357,6 +364,7 @@ static NetClientInfo net_tap_info = {
     .has_vnet_hdr_len = tap_has_vnet_hdr_len,
     .set_offload = tap_set_offload,
     .set_vnet_hdr_len = tap_set_vnet_hdr_len,
+    .get_vnet_hash_supported_types = tap_get_vnet_hash_supported_types,
     .set_vnet_automq = tap_set_vnet_automq,
     .set_vnet_rss = tap_set_vnet_rss,
     .set_vnet_le = tap_set_vnet_le,

-- 
2.49.0