netdev - [PATCH net 2/3] dpaa2-eth: set needed_headroom for net

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Message-Id: <20231122155117.2816724-3-ioana.ciornei@nxp.com>
Date: Wed, 22 Nov 2023 17:51:16 +0200
From: Ioana Ciornei <ioana.ciornei@....com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: andrew@...n.ch,
	netdev@...r.kernel.org,
	Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH net 2/3] dpaa2-eth: set needed_headroom for net_device

Set the needed_headroom net device field to the usual value that the
driver would need on the Tx path:
	- 64 bytes for the software annotation area
	- 64 bytes to account for a 64 byte aligned buffer address

In the circumstances in which the needed Tx HW annotation would increase
the needed headroom, for example timestamping, the driver is already
capable to send a S/G frame with a single data buffer which circumvents
the limited skb headroom.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index f2676fd50e1f..774377db0b4b 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -4965,6 +4965,8 @@ static int dpaa2_eth_probe(struct fsl_mc_device *dpni_dev)
 	if (err)
 		goto err_dl_port_add;
 
+	net_dev->needed_headroom = DPAA2_ETH_SWA_SIZE + DPAA2_ETH_TX_BUF_ALIGN;
+
 	err = register_netdev(net_dev);
 	if (err < 0) {
 		dev_err(dev, "register_netdev() failed\n");
-- 
2.25.1