linux-kernel - [PATCH 03/12 net-next] qca_spi: Avoid skb_copy

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Message-Id: <20231214150944.55808-4-wahrenst@gmx.net>
Date:   Thu, 14 Dec 2023 16:09:35 +0100
From:   Stefan Wahren <wahrenst@....net>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Wahren <wahrenst@....net>
Subject: [PATCH 03/12 net-next] 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@....net>
---
 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 88f2468ba676..f0c99ac8d73d 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -859,6 +859,8 @@ 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