qca_spi: Avoid skb_copy_expand in TX path

The skb spare room needs to be expanded for SPI header, footer
and possible padding within the TX path. So announce the necessary
space in order to avoid expensive skb_copy_expand calls.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 3f7e38a11ba0a1c756af1f8774e3c305c3e44588..5fabb40cca050eb354e22741677e3aec031958ef 100644 (file)
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -878,6 +878,8 @@ qcaspi_netdev_setup(struct net_device *dev)
        qcaspi_set_ethtool_ops(dev);
        dev->watchdog_timeo = QCASPI_TX_TIMEOUT;
        dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+       dev->needed_tailroom = ALIGN(QCAFRM_FOOTER_LEN + QCAFRM_MIN_LEN, 4);
+       dev->needed_headroom = ALIGN(QCAFRM_HEADER_LEN, 4);
        dev->tx_queue_len = 100;
 
        /* MTU range: 46 - 1500 */