sunvnet: fix rx packet length check to allow for TSO

This patch fixes the rx packet length check in the sunvnet driver to allow
for a TSO max packet length greater than the LDC channel negotiated MTU.
These are negotiated separately and there is no requirement that
port->tsolen be less than port->rmtu, but if it isn't, it'll drop packets
with rx length errors.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Acked-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index d2835bf7b4fb..b5a1d3d7b0bf 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -351,10 +351,15 @@ static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
         unsigned int len = desc->size;
         unsigned int copy_len;
         struct sk_buff *skb;
+        int maxlen;
         int err;
 
         err = -EMSGSIZE;
-        if (unlikely(len < ETH_ZLEN || len > port->rmtu)) {
+        if (port->tso && port->tsolen > port->rmtu)
+                maxlen = port->tsolen;
+        else
+                maxlen = port->rmtu;
+        if (unlikely(len < ETH_ZLEN || len > maxlen)) {
                 dev->stats.rx_length_errors++;
                 goto out_dropped;
         }