netdev - Re: [RFC v2 2/2] e100: Support RXFCS feature flag.

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Message-ID: <4E0B383E.8020807@candelatech.com>
Date:	Wed, 29 Jun 2011 07:35:42 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Michał Mirosław <mirqus@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: [RFC v2 2/2] e100: Support RXFCS feature flag.

On 06/29/2011 07:33 AM, Michał Mirosław wrote:
> W dniu 29 czerwca 2011 16:22 użytkownik Ben Greear
> <greearb@...delatech.com>  napisał:
>> On 06/29/2011 04:37 AM, Michał Mirosław wrote:
>>> 2011/6/24<greearb@...delatech.com>:
>>>> From: Ben Greear<greearb@...delatech.com>
>>>>
>>>> This allows e100 to be configured to append the
>>>> Ethernet FCS to the skb.
>>>>
>>>> Useful for sniffing networks.
>>>>
>>>> Signed-off-by: Ben Greear<greearb@...delatech.com>
>>>> ---
>>>> :100644 100644 c1352c6... 761f6f5... M  drivers/net/e100.c
>>>>   drivers/net/e100.c |   15 ++++++++++++---
>>>>   1 files changed, 12 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/net/e100.c b/drivers/net/e100.c
>>>> index c1352c6..761f6f5 100644
>>>> --- a/drivers/net/e100.c
>>>> +++ b/drivers/net/e100.c
>>>> @@ -1089,6 +1089,7 @@ static void e100_configure(struct nic *nic, struct
>>>> cb *cb, struct sk_buff *skb)
>>>>   {
>>>>         struct config *config =&cb->u.config;
>>>>         u8 *c = (u8 *)config;
>>>> +       struct net_device *netdev = nic->netdev;
>>>>
>>>>         cb->command = cpu_to_le16(cb_config);
>>>>
>>>> @@ -1132,6 +1133,9 @@ static void e100_configure(struct nic *nic, struct
>>>> cb *cb, struct sk_buff *skb)
>>>>                 config->promiscuous_mode = 0x1;         /* 1=on, 0=off */
>>>>         }
>>>>
>>>> +       if (netdev->wanted_features&    NETIF_F_RXFCS)
>>>> +               config->rx_crc_transfer = 0x1;  /* 1=save, 0=discard */
>>>> +
>>> You should check netdev->features here.
>> I thought 'features' was what the NIC could support, and wanted_features
>> was what the NIC was currently configured to support?  I don't want
>> to rx the CRC all the time, just when users enable it...
>
> hw_features is what device could support, and features is what device
> has currently turned on.

Ok, thanks for that correction.

What does wanted_features mean, then?

Thanks,
Ben

>
> Best Regards,
> Michał Mirosław


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com
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