staging: fsl-dpaa2/eth: Check SGT final bit is present

For scatter-gather ingress frames, we expect to receive
a list of fragments from the hardware, last of which is
marked with a "final" bit.

Add a check to make sure the Rx frame has this bit set
correctly; there's not much we can do in case of a
malformed frame, but at least issue a warning.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index e9fe1c9..6f009d1 100644 (file)
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -213,6 +213,8 @@ static struct sk_buff *build_frag_skb(struct dpaa2_eth_priv *priv,
                        break;
        }
 
+       WARN_ONCE(i == DPAA2_ETH_MAX_SG_ENTRIES, "Final bit not set in SGT");
+
        /* Count all data buffers + SG table buffer */
        ch->buf_count -= i + 2;