Re: [RFC PATCH v3 01/20] net: page_pool: add ppiov mangling helper

[Mina Almasry <almasrymina@google.com>]

On Tue, Dec 19, 2023 at 1:04 PM David Wei <dw@davidwei.uk> wrote:
>
> From: Pavel Begunkov <asml.silence@gmail.com>
>
> NOT FOR UPSTREAM
>
> The final version will depend on how ppiov looks like, but add a
> convenience helper for now.
>

Thanks, this patch becomes unnecessary once you pull in the latest
version of our changes; you could use net_iov_to_netmem() added here:

https://patchwork.kernel.org/project/netdevbpf/patch/20231218024024.3516870-9-almasrymina@google.com/

Not any kind of objection from me, just an FYI.

> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> Signed-off-by: David Wei <dw@davidwei.uk>
> ---
>  include/net/page_pool/helpers.h | 5 +++++
>  net/core/page_pool.c            | 2 +-
>  2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
> index 95f4d579cbc4..92804c499833 100644
> --- a/include/net/page_pool/helpers.h
> +++ b/include/net/page_pool/helpers.h
> @@ -86,6 +86,11 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats)
>
>  /* page_pool_iov support */
>
> +static inline struct page *page_pool_mangle_ppiov(struct page_pool_iov *ppiov)
> +{
> +       return (struct page *)((unsigned long)ppiov | PP_DEVMEM);
> +}
> +
>  static inline struct dmabuf_genpool_chunk_owner *
>  page_pool_iov_owner(const struct page_pool_iov *ppiov)
>  {
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index c0bc62ee77c6..38eff947f679 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -1074,7 +1074,7 @@ static struct page *mp_dmabuf_devmem_alloc_pages(struct page_pool *pool,
>         pool->pages_state_hold_cnt++;
>         trace_page_pool_state_hold(pool, (struct page *)ppiov,
>                                    pool->pages_state_hold_cnt);
> -       return (struct page *)((unsigned long)ppiov | PP_DEVMEM);
> +       return page_pool_mangle_ppiov(ppiov);
>  }
>
>  static void mp_dmabuf_devmem_destroy(struct page_pool *pool)
> --
> 2.39.3
>


-- 
Thanks,
Mina