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Message-ID: <4E0B42CE.30400@candelatech.com>
Date: Wed, 29 Jun 2011 08:20:46 -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 08:06 AM, Michał Mirosław wrote:
> W dniu 29 czerwca 2011 16:35 użytkownik Ben Greear
> <greearb@...delatech.com> napisał:
>> 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?
>
> What user wants to be active. It should be more clear to you if you
> read the implemetation: netdev_update_features() and friends.
I read it. Seems the code won't let you turn on something not supported,
so if user wants RXFCS, then wanted_features will have it enabled. So,
I'm not sure why my e100 patch would be wrong in that case.
Thanks,
Ben
>
> Best Regards,
> Michał Mirosław
--
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc http://www.candelatech.com
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