On Fri, 22 Feb 2002 14:57:22 -0800, harish.vasudeva@amd.com wrote:
>
> I am trying to offload checksum calculation to my hardware. What i am doing in my driver (kernel 2.4.6) is :
>
> dev->features = NETIF_F_IP_CHECKSUM;
>
> Then, in my start_xmit( ) routine, i am parsing for the right headers & when i get the IP/TCP header, i print out the checksum & it is already the right checksum. When does the OS/Protocol offload this task? Am i missing something here?
I haven't looked at this in a long time, but at the time the checksum
offloading support was introduced, the IP stack needed both NETIF_F_SG
and NETIF_F_IP_CSUM in dev->features before it would start offloading.
The idea was that cksum support without scatter-gather support is useless,
because the csum gets calculated essentially for free while copying the data
to linearize the skbuf.
Ion
--
It is better to keep your mouth shut and be thought a fool,
than to open it and remove all doubt.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Feb 23 2002 - 21:00:47 EST