netdev - Re: [PATCH bpf-next v3 07/12] mlx4: Introduce mlx4_xdp_buff wrapper for xdp

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Date:   Thu, 8 Dec 2022 11:07:05 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Tariq Toukan <ttoukan.linux@...il.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        haoluo@...gle.com, jolsa@...nel.org,
        Tariq Toukan <tariqt@...dia.com>,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 07/12] mlx4: Introduce mlx4_xdp_buff wrapper
 for xdp_buff

On Wed, Dec 7, 2022 at 10:11 PM Tariq Toukan <ttoukan.linux@...il.com> wrote:
>
>
>
> On 12/6/2022 4:45 AM, Stanislav Fomichev wrote:
> > No functional changes. Boilerplate to allow stuffing more data after xdp_buff.
> >
> > Cc: Tariq Toukan <tariqt@...dia.com>
> > Cc: John Fastabend <john.fastabend@...il.com>
> > Cc: David Ahern <dsahern@...il.com>
> > Cc: Martin KaFai Lau <martin.lau@...ux.dev>
> > Cc: Jakub Kicinski <kuba@...nel.org>
> > Cc: Willem de Bruijn <willemb@...gle.com>
> > Cc: Jesper Dangaard Brouer <brouer@...hat.com>
> > Cc: Anatoly Burakov <anatoly.burakov@...el.com>
> > Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
> > Cc: Magnus Karlsson <magnus.karlsson@...il.com>
> > Cc: Maryam Tahhan <mtahhan@...hat.com>
> > Cc: xdp-hints@...-project.net
> > Cc: netdev@...r.kernel.org
> > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> > ---
> >   drivers/net/ethernet/mellanox/mlx4/en_rx.c | 26 +++++++++++++---------
> >   1 file changed, 15 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> > index 8f762fc170b3..9c114fc723e3 100644
> > --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> > +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> > @@ -661,9 +661,14 @@ static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
> >   #define MLX4_CQE_STATUS_IP_ANY (MLX4_CQE_STATUS_IPV4)
> >   #endif
> >
> > +struct mlx4_xdp_buff {
> > +     struct xdp_buff xdp;
> > +};
> > +
>
> Prefer name with 'en', struct mlx4_en_xdp_buff.

Sure, will rename!


> >   int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
> >   {
> >       struct mlx4_en_priv *priv = netdev_priv(dev);
> > +     struct mlx4_xdp_buff mxbuf = {};
> >       int factor = priv->cqe_factor;
> >       struct mlx4_en_rx_ring *ring;
> >       struct bpf_prog *xdp_prog;
> > @@ -671,7 +676,6 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> >       bool doorbell_pending;
> >       bool xdp_redir_flush;
> >       struct mlx4_cqe *cqe;
> > -     struct xdp_buff xdp;
> >       int polled = 0;
> >       int index;
> >
> > @@ -681,7 +685,7 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> >       ring = priv->rx_ring[cq_ring];
> >
> >       xdp_prog = rcu_dereference_bh(ring->xdp_prog);
> > -     xdp_init_buff(&xdp, priv->frag_info[0].frag_stride, &ring->xdp_rxq);
> > +     xdp_init_buff(&mxbuf.xdp, priv->frag_info[0].frag_stride, &ring->xdp_rxq);
> >       doorbell_pending = false;
> >       xdp_redir_flush = false;
> >
> > @@ -776,24 +780,24 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> >                                               priv->frag_info[0].frag_size,
> >                                               DMA_FROM_DEVICE);
> >
> > -                     xdp_prepare_buff(&xdp, va - frags[0].page_offset,
> > +                     xdp_prepare_buff(&mxbuf.xdp, va - frags[0].page_offset,
> >                                        frags[0].page_offset, length, false);
> > -                     orig_data = xdp.data;
> > +                     orig_data = mxbuf.xdp.data;
> >
> > -                     act = bpf_prog_run_xdp(xdp_prog, &xdp);
> > +                     act = bpf_prog_run_xdp(xdp_prog, &mxbuf.xdp);
> >
> > -                     length = xdp.data_end - xdp.data;
> > -                     if (xdp.data != orig_data) {
> > -                             frags[0].page_offset = xdp.data -
> > -                                     xdp.data_hard_start;
> > -                             va = xdp.data;
> > +                     length = mxbuf.xdp.data_end - mxbuf.xdp.data;
> > +                     if (mxbuf.xdp.data != orig_data) {
> > +                             frags[0].page_offset = mxbuf.xdp.data -
> > +                                     mxbuf.xdp.data_hard_start;
> > +                             va = mxbuf.xdp.data;
> >                       }
> >
> >                       switch (act) {
> >                       case XDP_PASS:
> >                               break;
> >                       case XDP_REDIRECT:
> > -                             if (likely(!xdp_do_redirect(dev, &xdp, xdp_prog))) {
> > +                             if (likely(!xdp_do_redirect(dev, &mxbuf.xdp, xdp_prog))) {
> >                                       ring->xdp_redirect++;
> >                                       xdp_redir_flush = true;
> >                                       frags[0].page = NULL;