Hi Cong Wang, 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 participated in "hard_header_len vs needed_headroom" discussions in the past. Can you help me review this patch? Thanks!
The patch is at: http://patchwork.ozlabs.org/project/netdev/patch/20200726110524.151957-1-xie.he.0...@gmail.com/ In my understanding, hard_header_len should be the length of the header created by dev_hard_header. Any additional headroom needed should be declared in needed_headroom instead of hard_header_len. I came to this conclusion by examining the logic of net/packet/af_packet.c:packet_snd. What do you think? Thanks!
