netdev - Re: [PATCH v2 03/24] page_pool: Add netmem_set_dma_addr() and netmem_get_dma

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Message-ID: <CAC_iWjK38RHjaPfkBea68MOQHF2R_gUSsLjoHXniyW-ZRMHWMA@mail.gmail.com>
Date:   Tue, 10 Jan 2023 11:17:35 +0200
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Jesper Dangaard Brouer <hawk@...nel.org>, netdev@...r.kernel.org,
        linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH v2 03/24] page_pool: Add netmem_set_dma_addr() and netmem_get_dma_addr()

On Mon, 9 Jan 2023 at 19:30, Ilias Apalodimas
<ilias.apalodimas@...aro.org> wrote:
>
> Hi Matthew
>
> On Thu, 5 Jan 2023 at 23:46, Matthew Wilcox (Oracle)
> <willy@...radead.org> wrote:
> >
> > Turn page_pool_set_dma_addr() and page_pool_get_dma_addr() into
> > wrappers.
> >
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> > ---
> >  include/net/page_pool.h | 22 ++++++++++++++++------
> >  1 file changed, 16 insertions(+), 6 deletions(-)
> >
> > diff --git a/include/net/page_pool.h b/include/net/page_pool.h
> > index 84b4ea8af015..196b585763d9 100644
> > --- a/include/net/page_pool.h
> > +++ b/include/net/page_pool.h
> > @@ -449,21 +449,31 @@ static inline void page_pool_recycle_direct(struct page_pool *pool,
> >  #define PAGE_POOL_DMA_USE_PP_FRAG_COUNT        \
> >                 (sizeof(dma_addr_t) > sizeof(unsigned long))
> >
> > -static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
> > +static inline dma_addr_t netmem_get_dma_addr(struct netmem *nmem)
>
> Ideally, we'd like to avoid having people call these directly and use
> the page_pool_(get|set)_dma_addr wrappers.  Can we add a comment in
> v3?

Ignore this, I just saw the changes in mlx5.  This is fine as is

>
> >  {
> > -       dma_addr_t ret = page->dma_addr;
> > +       dma_addr_t ret = nmem->dma_addr;
> >
> >         if (PAGE_POOL_DMA_USE_PP_FRAG_COUNT)
> > -               ret |= (dma_addr_t)page->dma_addr_upper << 16 << 16;
> > +               ret |= (dma_addr_t)nmem->dma_addr_upper << 16 << 16;
> >
> >         return ret;
> >  }
> >
> > -static inline void page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
> > +static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
> > +{
> > +       return netmem_get_dma_addr(page_netmem(page));
> > +}
> > +
> > +static inline void netmem_set_dma_addr(struct netmem *nmem, dma_addr_t addr)
> >  {
> > -       page->dma_addr = addr;
> > +       nmem->dma_addr = addr;
> >         if (PAGE_POOL_DMA_USE_PP_FRAG_COUNT)
> > -               page->dma_addr_upper = upper_32_bits(addr);
> > +               nmem->dma_addr_upper = upper_32_bits(addr);
> > +}
> > +
> > +static inline void page_pool_set_dma_addr(struct page *page, dma_addr_t addr)
> > +{
> > +       netmem_set_dma_addr(page_netmem(page), addr);
> >  }
> >
> >  static inline bool is_page_pool_compiled_in(void)
> > --
> > 2.35.1
> >
>
> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>