networkd: tap add support for vnet_hdr

 This patch adds support to configure IFF_VNET_HDR flag
for a tap device. It allows whether sending and receiving
large pass larger (GSO) packets. This greatly increases the
achievable throughput.

diff --git a/src/network/networkd-netdev-gperf.gperf b/src/network/networkd-netdev-gperf.gperf
index 66ed2e0..010c106 100644 (file)
--- a/src/network/networkd-netdev-gperf.gperf
+++ b/src/network/networkd-netdev-gperf.gperf
@@ -59,6 +59,7 @@ Tun.Group,                   config_parse_string,                0,
 Tap.OneQueue,                config_parse_bool,                  0,                             offsetof(TunTap, one_queue)
 Tap.MultiQueue,              config_parse_bool,                  0,                             offsetof(TunTap, multi_queue)
 Tap.PacketInfo,              config_parse_bool,                  0,                             offsetof(TunTap, packet_info)
+Tap.VnetHeader,              config_parse_bool,                  0,                             offsetof(TunTap, vnet_hdr)
 Tap.User,                    config_parse_string,                0,                             offsetof(TunTap, user_name)
 Tap.Group,                   config_parse_string,                0,                             offsetof(TunTap, group_name)
 Bond.Mode,                   config_parse_bond_mode,             0,                             offsetof(Bond, mode)

diff --git a/src/network/networkd-netdev-tuntap.c b/src/network/networkd-netdev-tuntap.c
index 378312f..ba84e80 100644 (file)
--- a/src/network/networkd-netdev-tuntap.c
+++ b/src/network/networkd-netdev-tuntap.c
@@ -51,6 +51,9 @@ static int netdev_fill_tuntap_message(NetDev *netdev, struct ifreq *ifr) {
         if (t->multi_queue)
                 ifr->ifr_flags |= IFF_MULTI_QUEUE;
 
+        if (t->vnet_hdr)
+                ifr->ifr_flags |= IFF_VNET_HDR;
+
         strncpy(ifr->ifr_name, netdev->ifname, IFNAMSIZ-1);
 
         return 0;

diff --git a/src/network/networkd-netdev-tuntap.h b/src/network/networkd-netdev-tuntap.h
index b804875..29f8bb0 100644 (file)
--- a/src/network/networkd-netdev-tuntap.h
+++ b/src/network/networkd-netdev-tuntap.h
@@ -33,6 +33,7 @@ struct TunTap {
         bool one_queue;
         bool multi_queue;
         bool packet_info;
+        bool vnet_hdr;
 };
 
 extern const NetDevVTable tun_vtable;