| Message ID | 20200605125324.52474-1-bloodyreaper@yandex.ru |
|---|---|
| State | New |
| Headers | show |
| Series | [net] net: ethernet: mvneta: fix MVNETA_SKB_HEADROOM alignment | expand |
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 011cd26953d9..4cc9abd61c43 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -325,7 +325,7 @@ cache_line_size()) /* Driver assumes that the last 3 bits are 0 */ -#define MVNETA_SKB_HEADROOM (max(XDP_PACKET_HEADROOM, NET_SKB_PAD) & ~0x7) +#define MVNETA_SKB_HEADROOM ALIGN(max(NET_SKB_PAD, XDP_PACKET_HEADROOM), 8) #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)
Commit ca23cb0bc50f ("mvneta: MVNETA_SKB_HEADROOM set last 3 bits to zero") added headroom alignment check against 8. Hovewer (if we imagine that NET_SKB_PAD or XDP_PACKET_HEADROOM is not aligned to cacheline size), it actually aligns headroom down, while skb/xdp_buff headroom should be *at least* equal to one of the values (depending on XDP prog presence). So, fix the check to align the value up. This satisfies both hardware/driver and network stack requirements. Fixes: ca23cb0bc50f ("mvneta: MVNETA_SKB_HEADROOM set last 3 bits to zero") Signed-off-by: Alexander Lobakin <bloodyreaper@yandex.ru> --- drivers/net/ethernet/marvell/mvneta.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)