netdev - Re: [PATCH net-next] sfc: use the new __netdev_tx_sent

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Date:   Thu, 8 Nov 2018 12:13:53 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Edward Cree <ecree@...arflare.com>,
        linux-net-drivers@...arflare.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] sfc: use the new __netdev_tx_sent_queue BQL
 optimisation



On 11/08/2018 11:47 AM, Edward Cree wrote:
> As added in 3e59020abf0f ("net: bql: add __netdev_tx_sent_queue()"), which
>  see for performance rationale.
> 
> Signed-off-by: Edward Cree <ecree@...arflare.com>
> ---
>  drivers/net/ethernet/sfc/tx.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
> index c3ad564ac4c0..22eb059086f7 100644
> --- a/drivers/net/ethernet/sfc/tx.c
> +++ b/drivers/net/ethernet/sfc/tx.c
> @@ -553,13 +553,10 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
>  	if (!data_mapped && (efx_tx_map_data(tx_queue, skb, segments)))
>  		goto err;
>  
> -	/* Update BQL */
> -	netdev_tx_sent_queue(tx_queue->core_txq, skb_len);
> -
>  	efx_tx_maybe_stop_queue(tx_queue);
>  
>  	/* Pass off to hardware */
> -	if (!xmit_more || netif_xmit_stopped(tx_queue->core_txq)) {
> +	if (__netdev_tx_sent_queue(tx_queue->core_txq, skb_len, xmit_more)) {
>  		struct efx_tx_queue *txq2 = efx_tx_queue_partner(tx_queue);
>  
>  		/* There could be packets left on the partner queue if those
> 

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !