diff options
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 2d5d5fbb435c..f59fa26d4826 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -108,36 +108,37 @@ On receive: ----------- -Incoming, dev->hard_header!=NULL +Incoming, dev->header_ops != NULL mac_header -> ll header data -> data -Outgoing, dev->hard_header!=NULL +Outgoing, dev->header_ops != NULL mac_header -> ll header data -> ll header -Incoming, dev->hard_header==NULL - mac_header -> UNKNOWN position. It is very likely, that it points to ll - header. PPP makes it, that is wrong, because introduce - assymetry between rx and tx paths. +Incoming, dev->header_ops == NULL + mac_header -> data + However drivers often make it point to the ll header. + This is incorrect because the ll header should be invisible to us. data -> data -Outgoing, dev->hard_header==NULL - mac_header -> data. ll header is still not built! +Outgoing, dev->header_ops == NULL + mac_header -> data. ll header is invisible to us. data -> data Resume - If dev->hard_header==NULL we are unlikely to restore sensible ll header. + If dev->header_ops == NULL we are unable to restore the ll header, + because it is invisible to us. On transmit: ------------ -dev->hard_header != NULL +dev->header_ops != NULL mac_header -> ll header data -> ll header -dev->hard_header == NULL (ll header is added by device, we cannot control it) +dev->header_ops == NULL (ll header is invisible to us) mac_header -> data data -> data |