On Fri, Nov 21, 2014 at 09:35:21PM +0530, Varka Bhadram wrote: > Hi, > > There are two header_ops operations defined for mac802154 at [1]. One is for creating header another for parsing. > > Creation of mac802154_header_create() happening at [2] by using dev_hard_header(), but i did not find dev_parse_header() > for header parse by mac802154_header_parse(). > > Am i missing anything.? > For the dev_parse_header usage: `grep -r -n "dev_parse_header" net`: net/packet/af_packet.c:1823: sll->sll_halen = dev_parse_header(skb, sll->sll_addr); net/packet/af_packet.c:2030: sll->sll_halen = dev_parse_header(skb, sll->sll_addr); This is used by the packet layer at several places. I need to dig more into this. It seems that these callback structure are optional because dev_hard_header and dev_parse_header header return 0 if they are not implemented. Also it seems that when af_packet uses dev_hard_header header it could be that the control block information is overwritten by packet_skb_cb. So it's _maybe_ a bug to add additional parameters over control block information for the header_create callback. - Alex -- To unsubscribe from this list: send the line "unsubscribe linux-wpan" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
