net: extend NetClientInfo for offloading

Some new callbacks have been added to generalize the operations done
by virtio-net and vmxnet3 frontends to manipulate TAP offloadings.

Signed-off-by: Vincenzo Maffione <v.maffione@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

include/net/net.h

@@ -50,6 +50,12 @@ typedef void (NetCleanup) (NetClientState *);
 typedef void (LinkStatusChanged)(NetClientState *);
 typedef void (NetClientDestructor)(NetClientState *);
 typedef RxFilterInfo *(QueryRxFilter)(NetClientState *);
+typedef bool (HasUfo)(NetClientState *);
+typedef bool (HasVnetHdr)(NetClientState *);
+typedef bool (HasVnetHdrLen)(NetClientState *, int);
+typedef void (UsingVnetHdr)(NetClientState *, bool);
+typedef void (SetOffload)(NetClientState *, int, int, int, int, int);
+typedef void (SetVnetHdrLen)(NetClientState *, int);
 
 typedef struct NetClientInfo {
     NetClientOptionsKind type;
@@ -62,6 +68,12 @@ typedef struct NetClientInfo {
     LinkStatusChanged *link_status_changed;
     QueryRxFilter *query_rx_filter;
     NetPoll *poll;
+    HasUfo *has_ufo;
+    HasVnetHdr *has_vnet_hdr;
+    HasVnetHdrLen *has_vnet_hdr_len;
+    UsingVnetHdr *using_vnet_hdr;
+    SetOffload *set_offload;
+    SetVnetHdrLen *set_vnet_hdr_len;
 } NetClientInfo;
 
 struct NetClientState {
@@ -120,6 +132,13 @@ ssize_t qemu_send_packet_async(NetClientState *nc, const uint8_t *buf,
 void qemu_purge_queued_packets(NetClientState *nc);
 void qemu_flush_queued_packets(NetClientState *nc);
 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]);
+bool qemu_peer_has_ufo(NetClientState *nc);
+bool qemu_peer_has_vnet_hdr(NetClientState *nc);
+bool qemu_peer_has_vnet_hdr_len(NetClientState *nc, int len);
+void qemu_peer_using_vnet_hdr(NetClientState *nc, bool enable);
+void qemu_peer_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
+                           int ecn, int ufo);
+void qemu_peer_set_vnet_hdr_len(NetClientState *nc, int len);
 void qemu_macaddr_default_if_unset(MACAddr *macaddr);
 int qemu_show_nic_models(const char *arg, const char *const *models);
 void qemu_check_nic_model(NICInfo *nd, const char *model);

net/net.c

@@ -378,6 +378,61 @@ void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
     }
 }
 
+bool qemu_peer_has_ufo(NetClientState *nc)
+{
+    if (!nc->peer || !nc->peer->info->has_ufo) {
+        return false;
+    }
+
+    return nc->peer->info->has_ufo(nc->peer);
+}
+
+bool qemu_peer_has_vnet_hdr(NetClientState *nc)
+{
+    if (!nc->peer || !nc->peer->info->has_vnet_hdr) {
+        return false;
+    }
+
+    return nc->peer->info->has_vnet_hdr(nc->peer);
+}
+
+bool qemu_peer_has_vnet_hdr_len(NetClientState *nc, int len)
+{
+    if (!nc->peer || !nc->peer->info->has_vnet_hdr_len) {
+        return false;
+    }
+
+    return nc->peer->info->has_vnet_hdr_len(nc->peer, len);
+}
+
+void qemu_peer_using_vnet_hdr(NetClientState *nc, bool enable)
+{
+    if (!nc->peer || !nc->peer->info->using_vnet_hdr) {
+        return;
+    }
+
+    nc->peer->info->using_vnet_hdr(nc->peer, enable);
+}
+
+void qemu_peer_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
+                          int ecn, int ufo)
+{
+    if (!nc->peer || !nc->peer->info->set_offload) {
+        return;
+    }
+
+    nc->peer->info->set_offload(nc->peer, csum, tso4, tso6, ecn, ufo);
+}
+
+void qemu_peer_set_vnet_hdr_len(NetClientState *nc, int len)
+{
+    if (!nc->peer || !nc->peer->info->set_vnet_hdr_len) {
+        return;
+    }
+
+    nc->peer->info->set_vnet_hdr_len(nc->peer, len);
+}
+
 int qemu_can_send_packet(NetClientState *sender)
 {
     if (!sender->peer) {