IB/ipoib: Fix thinko in packet length checks

The packet length checks in ipoib are broken: we add 4 bytes (IPoIB
encapsulation header) when sending a packet, not 20 bytes (hardware
address length) to each packet.  Therefore, if connected mode is
enabled so that the interface MTU is larger than the multicast MTU,
IPoIB may end up trying to send too-long multicast packets.  For
example, multicast is broken if a message of size 2048 bytes is sent
on an interface with UD MTU 2048, because 2048 is bigger than the real
limit of 2044 but the code tests against the wrong limit of 2060.

This patch fixes <https://bugs.openfabrics.org/show_bug.cgi?id=418>,
submitted by Scott Weitzenkamp <sweitzen@cisco.com>.

Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 467564074e93..e70492db74f6 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -452,7 +452,7 @@ void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_
                            skb->len, tx->mtu);
                 ++priv->stats.tx_dropped;
                 ++priv->stats.tx_errors;
-                ipoib_cm_skb_too_long(dev, skb, tx->mtu - INFINIBAND_ALEN);
+                ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
                 return;
         }
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index f2aa923ddbea..ba0ee5cf2ad7 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -328,9 +328,9 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
         struct ipoib_tx_buf *tx_req;
         u64 addr;
 
-        if (unlikely(skb->len > priv->mcast_mtu + INFINIBAND_ALEN)) {
+        if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
-                           skb->len, priv->mcast_mtu + INFINIBAND_ALEN);
+                           skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
                 ++priv->stats.tx_dropped;
                 ++priv->stats.tx_errors;
                 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);