Re: [PATCH] drivers/net/wan/lapbether: Use needed_headroom instead of hard_header_len

[Xie He]

Hi Brian Norris,

I'm wishing to change a driver from using "hard_header_len" to using
"needed_headroom" to declare its needed headroom. I submitted a patch
and it is decided it needs to be reviewed. I see you submitted a similar
patch in the past. So I think you might be able to help review my patch.
Can you help review my patch? Thanks!

The patch is at:
http://patchwork.ozlabs.org/project/netdev/patch/20200726110524.151957-1-xie.he.0141@xxxxxxxxx/

As you have noted in the commit message of your patch, hard_header_len
has special meaning in AF_PACKET so we need to use needed_headroom
instead when we just need to reserve some header space. I believe the
value of hard_header_len should be the same as the length of the header
created by dev_hard_header.