netdev - Re: [PATCH 7/8] net/mlx4_en: adding loopback support

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Date:	Tue, 22 Nov 2011 17:34:32 -0800
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, ogerlitz@...lanox.com,
	oren@...lanox.co.il, amirv@...lanox.co.il
Subject: Re: [PATCH 7/8] net/mlx4_en: adding loopback support

On Mon, Nov 21, 2011 at 12:43 AM, Yevgeny Petrilin
<yevgenyp@...lanox.co.il> wrote:
>
> From: Amir Vadai <amirv@...lanox.co.il>
>
> Device must be in promiscious mode or DMAC must be same as the host MAC, or
> else packet will be dropped by the HW rx filtering.
>
> Signed-off-by: Amir Vadai <amirv@...lanox.co.il>
> ---
>  drivers/net/ethernet/mellanox/mlx4/en_netdev.c |    1 +
>  drivers/net/ethernet/mellanox/mlx4/en_tx.c     |    3 +++
>  include/linux/mlx4/qp.h                        |    1 +
>  3 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 78d776b..55fdbce 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -1088,6 +1088,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
>        dev->features = dev->hw_features | NETIF_F_HIGHDMA |
>                        NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
>                        NETIF_F_HW_VLAN_FILTER;
> +       dev->hw_features |= NETIF_F_LOOPBACK;
>
>        mdev->pndev[port] = dev;
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> index 3094f94..f9093b5 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> @@ -681,6 +681,9 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
>        tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f;
>        tx_desc->ctrl.srcrb_flags = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE |
>                                                MLX4_WQE_CTRL_SOLICITED);
> +       if (dev->features & NETIF_F_LOOPBACK)
> +               tx_desc->ctrl.srcrb_flags |=
> +                       cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);

This is re-calculated for every xmit. Is it required to be that way?
May be you can pre-calculate it and just assign / add it to the
control-flags here.

>        if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
>                tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
>                                                         MLX4_WQE_CTRL_TCP_UDP_CSUM);
> diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
> index 6562ff6..bee8fa2 100644
> --- a/include/linux/mlx4/qp.h
> +++ b/include/linux/mlx4/qp.h
> @@ -210,6 +210,7 @@ struct mlx4_wqe_ctrl_seg {
>         * [4]   IP checksum
>         * [3:2] C (generate completion queue entry)
>         * [1]   SE (solicited event)
> +        * [0]   FL (force loopback)
>         */
>        __be32                  srcrb_flags;
>        /*
> --
> 1.7.7
>
>
>
>
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