Le 21/01/2010 08:54, Changli Gao a écrit :

Sometimes, rxhash will be 0 generated. In order to check whether
rxhash is generated or not, a new bit field in sk_buff is needed. When
rxhash is generated and saved in sk_buff, the bit is set.

And, I think rxhash should be reserved when calling skb_copy and skb_clone.

I disagree

A null rxhash should not be generated by a driver, or even if its null,
why should we care ?

In this very unlikely event, let get_rps_cpu() compute a (non null) hash.

Adding a bit in skb for such low probability event brings nothing but complexity.