Re: [dpdk-dev] [PATCH v4 1/2] mbuf: add function returning default buffer address

[Yongseok Koh <yskoh@mellanox.com>]

On Fri, Jan 11, 2019 at 09:32:52AM +0100, David Marchand wrote:
> On Fri, Jan 11, 2019 at 9:11 AM David Marchand <david.marchand@redhat.com>
> wrote:
> 
> > On Thu, Jan 10, 2019 at 11:40 PM Yongseok Koh <yskoh@mellanox.com> wrote:
> > diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
> >
> >> index bc562dc8a9..5787616999 100644
> >> --- a/lib/librte_mbuf/rte_mbuf.h
> >> +++ b/lib/librte_mbuf/rte_mbuf.h
> >> @@ -788,8 +788,54 @@ rte_mbuf_from_indirect(struct rte_mbuf *mi)
> >>  }
> >>
> >>  /**
> >> + * Return the default buffer address of the mbuf.
> >>
> >
> > Nit: missed it... s/default //

Okay

> >
> > + *
> >> + * @warning
> >> + * @b EXPERIMENTAL: This API may change without prior notice.
> >> + * This will be used by rte_mbuf_to_baddr() which has redundant code once
> >> + * experimental tag is removed.
> >>
> >
> > Good point.
> > I wonder if we have a "todolist" for release n+2 so that we don't forget
> > about such things to do.
> > Thomas ?
> >
> 
> Maybe we could have something explicit in rte_mbuf_to_baddr that would
> avoid it "inherits" the experimental tag.
> 
> @@ -844,9 +844,13 @@ struct rte_mbuf_ext_shared_info {
>  static inline char *
>  rte_mbuf_to_baddr(struct rte_mbuf *md)
>  {
> +#ifdef ALLOW_EXPERIMENTAL_API
> +       return rte_mbuf_buf_addr(md, md->pool);
> +#else
>         char *buffer_addr;
>         buffer_addr = (char *)md + sizeof(*md) +
> rte_pktmbuf_priv_size(md->pool);
>         return buffer_addr;
> +#endif

I like it, so that we can't forget to change it.

Yongseok