i40e: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb

{__,}napi_alloc_skb() allocates and reserves additional NET_SKB_PAD
+ NET_IP_ALIGN for any skb.
OTOH, i40e_construct_skb_zc() currently allocates and reserves
additional `xdp->data - xdp->data_hard_start`, which is
XDP_PACKET_HEADROOM for XSK frames.
There's no need for that at all as the frame is post-XDP and will
go only to the networking stack core.
Pass the size of the actual data only to __napi_alloc_skb() and
don't reserve anything. This will give enough headroom for stack
processing.

Fixes: 0a714186d3c0 ("i40e: add AF_XDP zero-copy Rx support")
Signed-off-by: Alexander Lobakin <[email protected]>
Reviewed-by: Michal Swiatkowski <[email protected]>
Acked-by: Jesper Dangaard Brouer <[email protected]>
Tested-by: Kiran Bhandare <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

0 files changed, 0 insertions, 0 deletions