netdev - Re: [net-next v2 06/16] i40e: ignore duplicate port VLAN requests

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Message-ID: <55A6B382.1050004@cogentembedded.com>
Date:	Wed, 15 Jul 2015 22:24:50 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net
CC:	Mitch Williams <mitch.a.williams@...el.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com
Subject: Re: [net-next v2 06/16] i40e: ignore duplicate port VLAN requests

Hello.

On 07/15/2015 04:30 AM, Jeff Kirsher wrote:

> From: Mitch Williams <mitch.a.williams@...el.com>

> If user attempts to set a port VLAN on a VF that already has the same
> port VLAN configured, the driver will go through a completely
> unnecessary flurry of filter removals and filter adds. Just check for
> this condition and return success instead of doing a bunch of busywork.

> Change-ID: Ia1a9e83e6ed48b3f4658bc20dfc6af0cf525d54a
> Signed-off-by: Mitch Williams <mitch.a.williams@...el.com>
> Tested-by: Jim Young <james.m.young@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 4 ++++
>   1 file changed, 4 insertions(+)

> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index 23f95cd..433e803 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -2088,6 +2088,10 @@ int i40e_ndo_set_vf_port_vlan(struct net_device *netdev,
>   		goto error_pvid;
>   	}
>
> +	if (vsi->info.pvid == (vlan_id | (qos << I40E_VLAN_PRIORITY_SHIFT)))

    Parens around | not necessary (strictly speaking, around << too but gcc 
may have another opinion and warn about the parens).

[...]

MBR, Sergei

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