[PATCH V4 04/15 net-next] qca_spi: Avoid skb_copy_expand in TX path

[Stefan Wahren]

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@xxxxxxx>
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 3f7e38a11ba0..5fabb40cca05 100644
--- 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 */
--
2.34.1