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mvneta: MVNETA_SKB_HEADROOM set last 3 bits to zero

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For XDP the MVNETA_SKB_HEADROOM is used as an offset for
the received data.
The MVNETA manual states that the last 3 bits assumed to be 0.

This is currently the case but lets make it explicit in the definition
to prevent future problems.

Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sven Auhagen 2020-05-23 12:14:08 +02:00 committed by David S. Miller
parent 06ec313eea
commit ca23cb0bc5
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/marvell/mvneta.c
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@ -324,7 +324,8 @@
ETH_HLEN + ETH_FCS_LEN, \
cache_line_size())
#define MVNETA_SKB_HEADROOM max(XDP_PACKET_HEADROOM, NET_SKB_PAD)
/* Driver assumes that the last 3 bits are 0 */
#define MVNETA_SKB_HEADROOM (max(XDP_PACKET_HEADROOM, NET_SKB_PAD) & ~0x7)
#define MVNETA_SKB_PAD (SKB_DATA_ALIGN(sizeof(struct skb_shared_info) + \
MVNETA_SKB_HEADROOM))
#define MVNETA_SKB_SIZE(len) (SKB_DATA_ALIGN(len) + MVNETA_SKB_PAD)