On Thu, Mar 02, 2023 at 04:15:39PM +0800, Jason Wang wrote:
> On Thu, Mar 2, 2023 at 4:10 PM Michael S. Tsirkin <m...@redhat.com> 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
OK so assuming we do this, how will users program this exactly?
Given this is not standard, which tools will be used to attach such
a program to the device?
> >
> > --
> > MST
> >
> >
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