gianfar: Add Scatter Gather support

Scatter Gather support in gianfar driver to handle fragmented frames on
the transmit side.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Dai Haruki <dai.haruki@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index 9c8974dc8dd5..7ef3cc5cabe9 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -728,6 +728,7 @@ struct gfar_private {
         struct txbd8 *dirty_tx;         /* First buffer in line
                                            to be transmitted */
         unsigned int tx_ring_size;
+        unsigned int num_txbdfree;      /* number of TxBDs free */
 
         /* RX Locked fields */
         spinlock_t rxlock;