netdev - Re: [PATCH v9 00/11] Add driver bpf hook for early packet drop and forwarding

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Date:	Mon, 18 Jul 2016 10:16:37 -0700
From:	Brenden Blanco <bblanco@...mgrid.com>
To:	Tariq Toukan <ttoukan.linux@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Saeed Mahameed <saeedm@....mellanox.co.il>,
	Martin KaFai Lau <kafai@...com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Ari Saha <as754m@....com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Or Gerlitz <gerlitz.or@...il.com>, john.fastabend@...il.com,
	hannes@...essinduktion.org, Thomas Graf <tgraf@...g.ch>,
	Tom Herbert <tom@...bertland.com>,
	Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH v9 00/11] Add driver bpf hook for early packet drop and
 forwarding

On Mon, Jul 18, 2016 at 09:38:28AM -0700, Brenden Blanco wrote:
> On Mon, Jul 18, 2016 at 04:39:38PM +0300, Tariq Toukan wrote:
> > After applying the patchset, I get no ping between two VLAN
> > interfaces (w/o activating any BPF program).
> > I'm debugging it, and will update once I find the bug.
> > 
> > Brenden, please check if you can repro the issue.
> I was able to reproduce it also. I suspect a bug in patch 8/11.
I clearly didn't test vlans, sorry for that! The fix is pretty obvious, see
below if you want to double check. I will fix up 8/11 in the next iteration.
> > 
> > Regards,
> > Tariq
> > 

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 5d8452d..9df87ca 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -833,7 +831,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	bf_ok = ring->bf_enabled;
 	if (skb_vlan_tag_present(skb)) {
-		qpn_vlan.vlan_tag = skb_vlan_tag_get(skb);
+		qpn_vlan.vlan_tag = cpu_to_be16(skb_vlan_tag_get(skb));
 		vlan_proto = be16_to_cpu(skb->vlan_proto);
 		if (vlan_proto == ETH_P_8021AD)
 			qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN;