netdev - Re: [Intel-wired-lan] [PATCH bpf-next] ixgbe: fix xdp handle calculations

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Date:   Thu, 5 Sep 2019 11:30:17 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Kevin Laatz <kevin.laatz@...el.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Björn Töpel <bjorn.topel@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Bruce Richardson <bruce.richardson@...el.com>,
        ciara.loftus@...el.com,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH bpf-next] ixgbe: fix xdp handle calculations

On Thu, 5 Sep 2019 at 11:28, Kevin Laatz <kevin.laatz@...el.com> wrote:
>
> Currently, we don't add headroom to the handle in ixgbe_zca_free,
> ixgbe_alloc_buffer_slow_zc and ixgbe_alloc_buffer_zc. The addition of the
> headroom to the handle was removed in
> commit d8c3061e5edd ("ixgbe: modify driver for handling offsets"), which
> will break things when headroom isvnon-zero. This patch fixes this and uses
> xsk_umem_adjust_offset to add it appropritely based on the mode being run.
>
> Fixes: d8c3061e5edd ("ixgbe: modify driver for handling offsets")
> Reported-by: Bjorn Topel <bjorn.topel@...el.com>
> Signed-off-by: Kevin Laatz <kevin.laatz@...el.com>

Acked-by: Björn Töpel <bjorn.topel@...el.com>

> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
> index 17061c799f72..ad802a8909e0 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
> @@ -248,7 +248,8 @@ void ixgbe_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
>         bi->addr = xdp_umem_get_data(rx_ring->xsk_umem, handle);
>         bi->addr += hr;
>
> -       bi->handle = (u64)handle;
> +       bi->handle = xsk_umem_adjust_offset(rx_ring->xsk_umem, (u64)handle,
> +                                           rx_ring->xsk_umem->headroom);
>  }
>
>  static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
> @@ -274,7 +275,7 @@ static bool ixgbe_alloc_buffer_zc(struct ixgbe_ring *rx_ring,
>         bi->addr = xdp_umem_get_data(umem, handle);
>         bi->addr += hr;
>
> -       bi->handle = handle;
> +       bi->handle = xsk_umem_adjust_offset(umem, handle, umem->headroom);
>
>         xsk_umem_discard_addr(umem);
>         return true;
> @@ -301,7 +302,7 @@ static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
>         bi->addr = xdp_umem_get_data(umem, handle);
>         bi->addr += hr;
>
> -       bi->handle = handle;
> +       bi->handle = xsk_umem_adjust_offset(umem, handle, umem->headroom);
>
>         xsk_umem_discard_addr_rq(umem);
>         return true;
> --
> 2.17.1
>
> _______________________________________________
> Intel-wired-lan mailing list
> Intel-wired-lan@...osl.org
> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

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