The following commit has been merged in the master branch: commit a7ea49afcc888dd5aac76774767bfb90be937aad Author: Sven Eckelmann sven@narfation.org Date: Tue Sep 11 17:22:01 2018 +0200

batman-adv: Enable LockLess TX for softif

The batadv interfaces are virtual interfaces which just tunnel the traffic over other ethernet compatible interfaces. It doesn't need serialization during the tx phase and is using RCU for most of its internal datastructures. Since it doesn't have actual queues which could be locked independently, the throughput gets significantly reduced by the extra lock in the core net code.

8 parallel TCP connections forwarded by an IPQ4019 based hardware over 5GHz could reach:

* without LLTX: 349 Mibit/s * with LLTX: 563 Mibit/s

Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index e121c59fc1fa..2c7d95727f90 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -1050,6 +1050,7 @@ static void batadv_softif_init_early(struct net_device *dev) dev->needs_free_netdev = true; dev->priv_destructor = batadv_softif_free; dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; + dev->features |= NETIF_F_LLTX; dev->priv_flags |= IFF_NO_QUEUE;

/* can't call min_mtu, because the needed variables