On Thu, Mar 2, 2023 at 4:10 PM Michael S. Tsirkin <[email protected]> wrote:
>
> On Thu, Mar 02, 2023 at 03:57:10PM +0800, Jason Wang wrote:
> > Kernel had already used the eBPF program for hashing, classifying
> > various types of eBPF program other than XDP/socket filter
> > (pass/drop).
> >
> > Thanks
>
> where is it used for hashing?
I can see it is used by team/lb:
static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
struct sk_buff *skb)
{
struct bpf_prog *fp;
uint32_t lhash;
unsigned char *c;
fp = rcu_dereference_bh(lb_priv->fp);
if (unlikely(!fp))
return 0;
lhash = bpf_prog_run(fp, skb);
c = (char *) &lhash;
return c[0] ^ c[1] ^ c[2] ^ c[3];
}
But the point is that the return value is determined by the prog type
(or the context).
Thanks
>
> --
> MST
>
>
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