On 2018年09月07日 00:57, Michael S. Tsirkin wrote:
On Thu, Sep 06, 2018 at 12:05:17PM +0800, Jason Wang wrote:
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
any idea why didn't we do this straight away?
Dunno, but git grep told me not all XDP capable driver use this (e.g
virtio_net has its own value).
Anyway, I think it's ok for driver to have their specific value if they
can make sure the value is equal or greater than XDP_PACKET_HEADROOM.
Thanks
---
drivers/net/tun.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 2c548bd20393..d3677a544b56 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -113,7 +113,6 @@ do { \
} while (0)
#endif
-#define TUN_HEADROOM 256
#define TUN_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
/* TUN device flags */
@@ -1654,7 +1653,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
rcu_read_lock();
xdp_prog = rcu_dereference(tun->xdp_prog);
if (xdp_prog)
- pad += TUN_HEADROOM;
+ pad += XDP_PACKET_HEADROOM;
buflen += SKB_DATA_ALIGN(len + pad);
rcu_read_unlock();
--
2.17.1
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