netdev - [PATCH net v2 2/2] dpaa_eth: fix the RX headroom size alignment

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Date:   Wed, 28 Oct 2020 18:41:00 +0200
From:   Camelia Groza <camelia.groza@....com>
To:     willemdebruijn.kernel@...il.com, madalin.bucur@....nxp.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, Camelia Groza <camelia.groza@....com>
Subject: [PATCH net v2 2/2] dpaa_eth: fix the RX headroom size alignment

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")
Signed-off-by: Camelia Groza <camelia.groza@....com>
---
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 1aac0b6..278a684 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2842,7 +2842,8 @@ static int dpaa_ingress_cgr_init(struct dpaa_priv *priv)
 	return err;
 }

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

@@ -2856,10 +2857,13 @@ 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_PARSE_RESULTS_SIZE +
+	headroom = (u16)(bl[port].priv_data_size + DPAA_PARSE_RESULTS_SIZE +
 		DPAA_TIME_STAMP_SIZE + DPAA_HASH_RESULTS_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)
@@ -3027,8 +3031,8 @@ 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