netdev - Re: [PATCH next-queue 2/2] ixgbe: add unlikely notes to tx fastpath expressions

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Date:   Thu, 18 Jan 2018 17:06:53 +0800
From:   Yanjun Zhu <yanjun.zhu@...cle.com>
To:     Shannon Nelson <shannon.nelson@...cle.com>,
        intel-wired-lan@...ts.osuosl.org, jeffrey.t.kirsher@...el.com
Cc:     netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: Re: [PATCH next-queue 2/2] ixgbe: add unlikely notes to tx fastpath
 expressions



On 2018/1/9 6:47, Shannon Nelson wrote:
> Add unlikely() to a few error checking expressions in the Tx
> offload handling.
>
> Suggested-by: Yanjun Zhu <yanjun.zhu@...cle.com>
Hi,

I am fine with this patch. I have a question. The ipsec feature is 
supported in ixgbevf?

Thanks a lot.
Zhu Yanjun
> Signed-off-by: Shannon Nelson <shannon.nelson@...cle.com>
> ---
>   drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> index 57c10e6..3d069a2 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> @@ -749,28 +749,28 @@ int ixgbe_ipsec_tx(struct ixgbe_ring *tx_ring,
>   	struct xfrm_state *xs;
>   	struct tx_sa *tsa;
>   
> -	if (!first->skb->sp->len) {
> +	if (unlikely(!first->skb->sp->len)) {
>   		netdev_err(tx_ring->netdev, "%s: no xfrm state len = %d\n",
>   			   __func__, first->skb->sp->len);
>   		return 0;
>   	}
>   
>   	xs = xfrm_input_state(first->skb);
> -	if (!xs) {
> +	if (unlikely(!xs)) {
>   		netdev_err(tx_ring->netdev, "%s: no xfrm_input_state() xs = %p\n",
>   			   __func__, xs);
>   		return 0;
>   	}
>   
>   	itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
> -	if (itd->sa_idx > IXGBE_IPSEC_MAX_SA_COUNT) {
> +	if (unlikely(itd->sa_idx > IXGBE_IPSEC_MAX_SA_COUNT)) {
>   		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
>   			   __func__, itd->sa_idx, xs->xso.offload_handle);
>   		return 0;
>   	}
>   
>   	tsa = &ipsec->tx_tbl[itd->sa_idx];
> -	if (!tsa->used) {
> +	if (unlikely(!tsa->used)) {
>   		netdev_err(tx_ring->netdev, "%s: unused sa_idx=%d\n",
>   			   __func__, itd->sa_idx);
>   		return 0;