i40e: disallow changing the number of descriptors when AF_XDP is on
When an AF_XDP UMEM is attached to any of the Rx rings, we disallow a user to change the number of descriptors via e.g. "ethtool -G IFNAME". Otherwise, the size of the stash/reuse queue can grow unbounded, which would result in OOM or leaking userspace buffers. Signed-off-by: NBjörn Töpel <bjorn.topel@intel.com> Tested-by: NAndrew Bowers <andrewx.bowers@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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