bonding: Fix corrupted queue_mapping

In the transmit path of the bonding driver, skb->cb is used to
stash the skb->queue_mapping so that the bonding device can set its
own queue mapping.  This value becomes corrupted since the skb->cb is
also used in __dev_xmit_skb.

When transmitting through bonding driver, bond_select_queue is
called from dev_queue_xmit.  In bond_select_queue the original
skb->queue_mapping is copied into skb->cb (via bond_queue_mapping)
and skb->queue_mapping is overwritten with the bond driver queue.

Subsequently in dev_queue_xmit, __dev_xmit_skb is called which writes
the packet length into skb->cb, thereby overwriting the stashed
queue mappping.  In bond_dev_queue_xmit (called from hard_start_xmit),
the queue mapping for the skb is set to the stashed value which is now
the skb length and hence is an invalid queue for the slave device.

If we want to save skb->queue_mapping into skb->cb[], best place is to
add a field in struct qdisc_skb_cb, to make sure it wont conflict with
other layers (eg : Qdiscc, Infiniband...)

This patchs also makes sure (struct qdisc_skb_cb)->data is aligned on 8
bytes :

netem qdisc for example assumes it can store an u64 in it, without
misalignment penalty.

Note : we only have 20 bytes left in (struct qdisc_skb_cb)->data[].
The largest user is CHOKe and it fills it.

Based on a previous patch from Tom Herbert.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Tom Herbert <therbert@google.com>
Cc: John Fastabend <john.r.fastabend@intel.com>
Cc: Roland Dreier <roland@kernel.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 2 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 55ce96b53b09..9d7d54a00e63 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -220,13 +220,16 @@ struct tcf_proto {
 
 struct qdisc_skb_cb {
         unsigned int            pkt_len;
-        unsigned char           data[24];
+        u16                     bond_queue_mapping;
+        u16                     _pad;
+        unsigned char           data[20];
 };
 
 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
 {
         struct qdisc_skb_cb *qcb;
-        BUILD_BUG_ON(sizeof(skb->cb) < sizeof(unsigned int) + sz);
+
+        BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
         BUILD_BUG_ON(sizeof(qcb->data) < sz);
 }