netdev - Re: [PATCH v2 net 3/3] net/mlx4_en: use __netdev_tx_sent

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Date:   Thu, 1 Nov 2018 09:19:01 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
CC:     netdev <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v2 net 3/3] net/mlx4_en: use __netdev_tx_sent_queue()



On 31/10/2018 5:39 PM, Eric Dumazet wrote:
> doorbell only depends on xmit_more and netif_tx_queue_stopped()
> 
> Using __netdev_tx_sent_queue() avoids messing with BQL stop flag,
> and is more generic.
> 
> This patch increases performance on GSO workload by keeping
> doorbells to the minimum required.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Tariq Toukan <tariqt@...lanox.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/en_tx.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> index 1857ee0f0871d48285a6d3711f7c3e9a1e08a05f..6f5153afcab4dfc331c099da854c54f1b9500887 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> @@ -1006,7 +1006,6 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
>   		ring->packets++;
>   	}
>   	ring->bytes += tx_info->nr_bytes;
> -	netdev_tx_sent_queue(ring->tx_queue, tx_info->nr_bytes);
>   	AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len);
>   
>   	if (tx_info->inl)
> @@ -1044,7 +1043,10 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
>   		netif_tx_stop_queue(ring->tx_queue);
>   		ring->queue_stopped++;
>   	}
> -	send_doorbell = !skb->xmit_more || netif_xmit_stopped(ring->tx_queue);
> +
> +	send_doorbell = __netdev_tx_sent_queue(ring->tx_queue,
> +					       tx_info->nr_bytes,
> +					       skb->xmit_more);
>   
>   	real_size = (real_size / 16) & 0x3f;
>   
> 

Reviewed-by: Tariq Toukan <tariqt@...lanox.com>

Looks good to me.
Thanks.