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bareudp: Enable BIG TCP packets

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Commit f3d0f753f0 ("vxlan: Enable BIG TCP packets") and commit
03ebe91b0f ("geneve: Enable BIG TCP packets") allowed BIG TCP on vxlan
and geneve, after the preceding patches of that series made the common
UDP tunnel transmit path handle GSO packets larger than 64KB.

bareudp transmits through the same helpers, udp_tunnel_handle_offloads()
followed by udp_tunnel_xmit_skb() or udp_tunnel6_xmit_skb(), and does
not fill in any length field itself. Bump tso_max_size up to
GSO_MAX_SIZE so that the admin can use BIG TCP with bareudp too.

The default gso_max_size and gso_ipv4_max_size stay at 64KB, so nothing
changes unless they are raised explicitly.

iperf3 TCP over bareudp (ethertype ipv4, IPv4 outer) between two netns
connected by veth, MTU 1600 on veth, 3 runs of 20 seconds each. This
was measured in a QEMU TCG guest, so only the relative numbers are
meaningful:

  gso_max_size/gso_ipv4_max_size 65536:
    4380.6, 4404.2, 4354.5 Mbit/s, average 4379.8 Mbit/s

  gso_max_size/gso_ipv4_max_size 196608:
    5509.4, 5454.7, 5497.4 Mbit/s, average 5487.2 Mbit/s (+25%)

With 196608, about 90k to 100k packets larger than 64KB were
transmitted on the bareudp device per run, none with 65536. Without
this patch, setting gso_max_size to 196608 is rejected.

Acked-by: Alice Mikityanska <alice.kernel@fastmail.im>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20261011102023.1603595-2-yanhaishuang@cmss.chinamobile.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Haishuang Yan 2026-10-11 18:20:22 +08:00 committed by Jakub Kicinski
parent 3d0ae2a0b7
commit 1240de9e51
1 changed files with 1 additions and 0 deletions
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drivers/net/bareudp.c
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@ -590,6 +590,7 @@ static void bareudp_setup(struct net_device *dev)
dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
dev->type = ARPHRD_NONE;
netif_keep_dst(dev);
netif_set_tso_max_size(dev, GSO_MAX_SIZE);
dev->priv_flags |= IFF_NO_QUEUE;
dev->lltx = true;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;