[PATCH net v3 2/2] dpaa_eth: fix the RX headroom size alignment

[Camelia Groza]

The headroom reserved for received frames needs to be aligned to an
RX specific value. There is currently a discrepancy between the values
used in the Ethernet driver and the values passed to the FMan.
Coincidentally, the resulting aligned values are identical.

Fixes: 3c68b8fffb48 ("dpaa_eth: FMan erratum A050385 workaround")
Acked-by: Willem de Bruijn <will...@google.com>
Signed-off-by: Camelia Groza <camelia.gr...@nxp.com>
---
Changes in v3:
- remove the unnecessary inline identifier

Changes in v2:
- make the returned value for TX ports explicit
- simplify the buf_layout reference

 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c 
b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 3eaa5f2..d9c2859 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2845,7 +2845,8 @@ static int dpaa_ingress_cgr_init(struct dpaa_priv *priv)
        return err;
 }

-static inline u16 dpaa_get_headroom(struct dpaa_buffer_layout *bl)
+static u16 dpaa_get_headroom(struct dpaa_buffer_layout *bl,
+                            enum port_type port)
 {
        u16 headroom;

@@ -2859,9 +2860,12 @@ static inline u16 dpaa_get_headroom(struct 
dpaa_buffer_layout *bl)
         *
         * Also make sure the headroom is a multiple of data_align bytes
         */
-       headroom = (u16)(bl->priv_data_size + DPAA_HWA_SIZE);
+       headroom = (u16)(bl[port].priv_data_size + DPAA_HWA_SIZE);

-       return ALIGN(headroom, DPAA_FD_DATA_ALIGNMENT);
+       if (port == RX)
+               return ALIGN(headroom, DPAA_FD_RX_DATA_ALIGNMENT);
+       else
+               return ALIGN(headroom, DPAA_FD_DATA_ALIGNMENT);
 }

 static int dpaa_eth_probe(struct platform_device *pdev)
@@ -3029,8 +3033,8 @@ static int dpaa_eth_probe(struct platform_device *pdev)
                        goto free_dpaa_fqs;
        }

-       priv->tx_headroom = dpaa_get_headroom(&priv->buf_layout[TX]);
-       priv->rx_headroom = dpaa_get_headroom(&priv->buf_layout[RX]);
+       priv->tx_headroom = dpaa_get_headroom(priv->buf_layout, TX);
+       priv->rx_headroom = dpaa_get_headroom(priv->buf_layout, RX);

        /* All real interfaces need their ports initialized */
        err = dpaa_eth_init_ports(mac_dev, dpaa_bp, &port_fqs,
--
1.9.1