Xiu-Yan Wang wrote: > Tom Chen wrote: >> Hi, >> >> I am studying how to implement checksum offload on solaris platform. >> hcksum_retrieve API is used in many NIC drivers with such capability. But, I >> could not find any description of this API. there is no man page of this API >> on Solaris 10 and OpenSolaris. Can someone give me some explanation of each >> fields? I guess many other newcomers may also have such confusion. > > hcksum_retrieve() is not a public interface and the definition of it is > a bit obscure. > >> Another issue is the NIC, which I am working, can do TCP/UDP checksum >> offload but it requires GLD driver to tell it the offset of TCP/UDP data >> from the first byte of the outmost MAC packet ie. the sum of MAC header >> length+IP header length+TCP/UDP header length. >> Can I use ip_hdr_length_v6( ) to calculate this offset for IPv6 packets? > > You'd better sparse the packet to retrieve such information by the > driver itself. > > As far as checksum offload is concerned, the interfaces provided by the > stack are not driver-friendly.
If the interfaces are ever made driver friendly, it would be nice for them provide this sort of information. Having many drivers all have to parse packets themselves to recover information which the stack already knows seems like a bad practice. Drew _______________________________________________ networking-discuss mailing list [email protected]
