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Date: Fri, 28 Feb 2014 10:11:14 +0100
From: Ivan Vecera <ivecera@...hat.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, rmody@...cade.com, jiri@...nulli.us
Subject: [PATCH net] bna: fix vlan tag stripping and implement its toggling
The recent commit "fe1624c bna: RX Filter Enhancements" disables
VLAN tag stripping if the NIC is in promiscuous mode. This causes
__vlan_hwaccel_put_tag() is called when the stripping is disabled.
Because of this VLAN over bna does not work and causes BUGs in conjunction
with openvswitch like this:
=====
[18370.665074] kernel BUG at include/linux/skbuff.h:1497!
...
[18370.876769] Call Trace:
[18370.879455] <IRQ>
[18370.881569] [<ffffffffa063a3c6>] internal_dev_recv+0xb6/0x130 [openvswitch]
[18370.889552] [<ffffffffa06398ed>] ovs_vport_send+0x1d/0x80 [openvswitch]
[18370.896922] [<ffffffffa063016a>] do_output+0x2a/0x50 [openvswitch]
[18370.903814] [<ffffffffa06304cd>] do_execute_actions+0x19d/0xb20 [openvswitch]
[18370.911757] [<ffffffffa0630e7b>] ovs_execute_actions+0x2b/0x30 [openvswitch]
[18370.919602] [<ffffffffa0633722>] ovs_dp_process_received_packet+0x92/0x120 [openvswitch]
[18370.928597] [<ffffffff8109be83>] ? find_busiest_group+0x103/0x880
[18370.935396] [<ffffffffa063982a>] ovs_vport_receive+0x2a/0x30 [openvswitch]
[18370.943053] [<ffffffffa063a6b1>] netdev_frame_hook+0xc1/0x120 [openvswitch]
[18370.950802] [<ffffffff814b27c2>] __netif_receive_skb_core+0x262/0x840
[18370.957982] [<ffffffff81019a00>] ? flush_ptrace_hw_breakpoint+0x10/0x40
[18370.965349] [<ffffffff814b2db8>] __netif_receive_skb+0x18/0x60
[18370.971855] [<ffffffff814b2e33>] netif_receive_skb+0x33/0xb0
[18370.978172] [<ffffffff814b3736>] napi_gro_frags+0x116/0x170
[18370.984407] [<ffffffffa0c7aaa4>] bnad_napi_poll_rx+0x3f4/0x8f0 [bna]
[18370.991488] [<ffffffff814b31ba>] net_rx_action+0x15a/0x250
...
===
The following patch makes the following changes so the driver:
1. Implements .ndo_set_features so an user can toggle VLAN tag stripping
on/off
2. Does not disable VLAN tag stripping in promiscuous mode so the driver
respect user's choice
3. Calls __vlan_hwaccel_put_tag() only when the stripping is enabled
Signed-off-by: Ivan Vecera <ivecera@...hat.com>
---
drivers/net/ethernet/brocade/bna/bnad.c | 36 ++++++++++++++++++++++++---------
1 file changed, 27 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index cf64f3d..bc09056 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -707,7 +707,8 @@ bnad_cq_process(struct bnad *bnad, struct bna_ccb *ccb, int budget)
else
skb_checksum_none_assert(skb);
- if (flags & BNA_CQ_EF_VLAN)
+ if ((flags & BNA_CQ_EF_VLAN) &&
+ (bnad->netdev->features & NETIF_F_HW_VLAN_CTAG_RX))
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), ntohs(cmpl->vlan_tag));
if (BNAD_RXBUF_IS_SK_BUFF(unmap_q->type))
@@ -3245,11 +3246,6 @@ bnad_set_rx_mode(struct net_device *netdev)
BNA_RXMODE_ALLMULTI;
bna_rx_mode_set(bnad->rx_info[0].rx, new_mode, mode_mask, NULL);
- if (bnad->cfg_flags & BNAD_CF_PROMISC)
- bna_rx_vlan_strip_disable(bnad->rx_info[0].rx);
- else
- bna_rx_vlan_strip_enable(bnad->rx_info[0].rx);
-
spin_unlock_irqrestore(&bnad->bna_lock, flags);
}
@@ -3374,6 +3370,27 @@ bnad_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
return 0;
}
+int bnad_set_features(struct net_device *dev, netdev_features_t features)
+{
+ struct bnad *bnad = netdev_priv(dev);
+ netdev_features_t changed = features ^ dev->features;
+
+ if ((changed & NETIF_F_HW_VLAN_CTAG_RX) && netif_running(dev)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&bnad->bna_lock, flags);
+
+ if (features & NETIF_F_HW_VLAN_CTAG_RX)
+ bna_rx_vlan_strip_enable(bnad->rx_info[0].rx);
+ else
+ bna_rx_vlan_strip_disable(bnad->rx_info[0].rx);
+
+ spin_unlock_irqrestore(&bnad->bna_lock, flags);
+ }
+
+ return 0;
+}
+
#ifdef CONFIG_NET_POLL_CONTROLLER
static void
bnad_netpoll(struct net_device *netdev)
@@ -3421,6 +3438,7 @@ static const struct net_device_ops bnad_netdev_ops = {
.ndo_change_mtu = bnad_change_mtu,
.ndo_vlan_rx_add_vid = bnad_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = bnad_vlan_rx_kill_vid,
+ .ndo_set_features = bnad_set_features,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = bnad_netpoll
#endif
@@ -3433,14 +3451,14 @@ bnad_netdev_init(struct bnad *bnad, bool using_dac)
netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
- NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_TX;
+ NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_CTAG_RX;
netdev->vlan_features = NETIF_F_SG | NETIF_F_HIGHDMA |
NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_TSO | NETIF_F_TSO6;
- netdev->features |= netdev->hw_features |
- NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_HW_VLAN_CTAG_FILTER;
+ netdev->features |= netdev->hw_features | NETIF_F_HW_VLAN_CTAG_FILTER;
if (using_dac)
netdev->features |= NETIF_F_HIGHDMA;
--
1.8.3.2
--
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