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

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Message-ID: <BANLkTikaJNa2+jbW6HWwc+tEE-ciNxvkLg@mail.gmail.com>
Date:	Wed, 29 Jun 2011 16:33:51 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC v2 2/2] e100: Support RXFCS feature flag.

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.

Best Regards,
Michał Mirosław
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