netdev - Re: [net-next 09/13] igb: Pull adapter out of main path in igb_xmit_frame

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Message-ID: <515D8AFD.1000709@cogentembedded.com>
Date:	Thu, 04 Apr 2013 18:15:25 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
CC:	davem@...emloft.net, Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com
Subject: Re: [net-next 09/13] igb: Pull adapter out of main path in igb_xmit_frame_ring

Hello.

On 04-04-2013 15:37, Jeff Kirsher wrote:

> From: Alexander Duyck <alexander.h.duyck@...el.com>

> We only need the adapter pointer in the case of ptp.  As such we can pull the
> adapter out of the main path and place it inside the if statement to avoid
> the temptation of accessing the adapter pointer in the fast path.

> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Tested-by: Aaron Brown <aaron.f.brown@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

   Two minor nits.

> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
> index 29facb5..6043245 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
[...]
> @@ -4628,15 +4627,17 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb,
>
>   	skb_tx_timestamp(skb);
>
> -	if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
> -		     !(adapter->ptp_tx_skb))) {
> -		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
> -		tx_flags |= IGB_TX_FLAGS_TSTAMP;
> +	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
> +		struct igb_adapter *adapter = netdev_priv(tx_ring->netdev);

    An empty line wouldn't hurt here.

> +		if (!(adapter->ptp_tx_skb)) {

    Parens not needed here.

WBR, Sergei

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