tree 8d3039c50ecfee4389540c2c427f918f616b9987
parent 98efd69493b9d4b02353a552af8ffaaf30de8af4
author Alexander Duyck <alexander.h.duyck@intel.com> 1491393062 -0400
committer Jeff Kirsher <jeffrey.t.kirsher@intel.com> 1491645231 -0700

i40e/i40evf: Add support for padding start of frames

This patch adds padding to the start of frames to make room for headroom
for us to eventually start using build_skb.  Right now we guarantee at
least NET_SKB_PAD + NET_IP_ALIGN, however we allocate more space if more is
available.  For example on x86 the headroom should be 192 bytes.

On systems that have too large of a cache line size to support storing 1.5K
padding and shared info we default to using 3K buffers and reserve
everything that isn't used for skb_shared_info or the data buffer for
headroom.

Change-ID: I33c641c9a1ea10cf7cc484c2d20985368d2d709a
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>