Peter Memishian writes: > > > Thanks. In fact, it turns out that the bug I was trying to work > > around (the potential to send a UDP over IPv6 packet with a zero > > checksum) is not present in production firmware for our nic. Sorry to > > waste your time! > > > > However, there is one more thing I need to account for. Our nic has a > > "reasonable" limit as to how far into the frame the hcksum start/suff > > can be (don't ask ...). With multiple IPv6 headers, there could be a > > case when start/stuff exceeds the limit, and the driver must give up > > and calculate the checksum in software. > > > > Am I allowed to call IP_CSUM from inet/ip.h? > > Generally speaking: if it's not in the DDI, it's not safe to use it. That > said, we are always open to requests to add useful interfaces to the DDI.
If I'm going to request something, it should probably be a bit more complete. Both linux and MacOSX have functions which a driver can call in this situation. MacOSX calls it mbuf_outbound_finalize(), and it is documented here: http://developer.apple.com/documentation/Darwin/Reference/KPI_Reference/kpi_mbuf/CompositePage.html#//apple_ref/c/func/mbuf_outbound_finalize I would think that a DDI interface might want to be more like this.. Thanks, Drew _______________________________________________ networking-discuss mailing list [email protected]
