netdev - Re: [PATCH net-next] xsk: Have xsk_umem_peek_addr

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Date:   Thu, 18 Apr 2019 09:39:26 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        kernel-team@...com, "Karlsson, Magnus" <magnus.karlsson@...el.com>
Subject: Re: [PATCH net-next] xsk: Have xsk_umem_peek_addr_rq() return
 chunk-aligned handles.

On Wed, 17 Apr 2019 at 21:53, Jonathan Lemon <jonathan.lemon@...il.com> wrote:
>
> xkq_peek_addr() returns chunk-aligned handles, so have the rq behave
> the same way.  Clean up callsites.
>

Nice cleanup!

This should go to the bpf-next tree, and the non-upstreamed mlx5 parts
should obviously be removed (but I have to admit, I like it! ;-)).

For the i40e/ixgbe/xsk parts:

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

> Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
> Cc: Björn Töpel <bjorn.topel@...el.com>
> Cc: Maxim Mikityanskiy <maximmi@...lanox.com>
> Cc: netdev@...r.kernel.org
> ---
>  drivers/net/ethernet/intel/i40e/i40e_xsk.c          | 2 --
>  drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c        | 2 --
>  drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c | 2 +-
>  include/net/xdp_sock.h                              | 2 +-
>  4 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> index d28b629afc8a..d2e212d007c3 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> @@ -285,8 +285,6 @@ static bool i40e_alloc_buffer_slow_zc(struct i40e_ring *rx_ring,
>                 return false;
>         }
>
> -       handle &= rx_ring->xsk_umem->chunk_mask;
> -
>         hr = umem->headroom + XDP_PACKET_HEADROOM;
>
>         bi->dma = xdp_umem_get_dma(umem, handle);
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
> index 582d83d35f7e..fc5ca35b4dbf 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
> @@ -343,8 +343,6 @@ static bool ixgbe_alloc_buffer_slow_zc(struct ixgbe_ring *rx_ring,
>                 return false;
>         }
>
> -       handle &= rx_ring->xsk_umem->chunk_mask;
> -
>         hr = umem->headroom + XDP_PACKET_HEADROOM;
>
>         bi->dma = xdp_umem_get_dma(umem, handle);
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> index 61d75a7b3ce2..2f0b5fd1ee97 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> @@ -309,7 +309,7 @@ int mlx5e_xsk_page_alloc_umem(struct mlx5e_rq *rq,
>
>  static inline void mlx5e_xsk_recycle_frame(struct mlx5e_rq *rq, u64 handle)
>  {
> -       xsk_umem_fq_reuse(rq->umem, handle & rq->umem->chunk_mask);
> +       xsk_umem_fq_reuse(rq->umem, handle);
>  }
>
>  /* XSKRQ uses pages from UMEM, they must not be released. They are returned to
> diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
> index 7ebcb62fedf1..9d97ae73a287 100644
> --- a/include/net/xdp_sock.h
> +++ b/include/net/xdp_sock.h
> @@ -118,7 +118,7 @@ static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
>         if (!rq->length)
>                 return xsk_umem_peek_addr(umem, addr);
>
> -       *addr = rq->handles[rq->length - 1];
> +       *addr = rq->handles[rq->length - 1] & umem->chunk_mask;
>         return addr;
>  }
>
> --
> 2.17.1
>