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Message-Id: <1392726009-8083-2-git-send-email-makita.toshiaki@lab.ntt.co.jp>
Date: Tue, 18 Feb 2014 21:20:09 +0900
From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To: "David S . Miller" <davem@...emloft.net>
Cc: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>,
Maxim Krasnyansky <maxk@....qualcomm.com>,
netdev@...r.kernel.org,
Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Subject: [PATCH net] tun: remove bogus hardware vlan acceleration flags from vlan_features
From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
Even though only the outer vlan tag can be HW accelerated in the transmission
path, in the TUN/TAP driver vlan_features mirrors hw_features, which happens
to have the NETIF_F_HW_VLAN_?TAG_TX flags set. Because of this, during packet
tranmisssion through a stacked vlan device dev_hard_start_xmit, (incorrectly)
assuming that the vlan device supports hardware vlan acceleration, does not
add the vlan header to the skb payload and the inner vlan tags are lost
(vlan_tci contains the outer vlan tag when userspace reads the packet from
the tap device).
Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
---
diff -urNp linux-3.13.3-orig/drivers/net/tun.c linux-3.13.3/drivers/net/tun.c
--- linux-3.13.3-orig/drivers/net/tun.c 2014-01-20 11:40:07.000000000 +0900
+++ linux-3.13.3/drivers/net/tun.c 2014-02-18 16:23:04.461078629 +0900
@@ -1651,7 +1651,9 @@ static int tun_set_iff(struct net *net,
TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_STAG_TX;
dev->features = dev->hw_features;
- dev->vlan_features = dev->features;
+ dev->vlan_features = dev->features &
+ ~(NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_STAG_TX);
INIT_LIST_HEAD(&tun->disabled);
err = tun_attach(tun, file, false);
--
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