netdev - Re: [PATCH net-next] r8169: Add 64bit statistics

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Message-ID: <CABoNC81psapa0-Nog5+nDff7PgQszC7mTQPwHUeDAFjHTemdYA@mail.gmail.com>
Date:	Thu, 17 Nov 2011 15:39:05 +0800
From:	Junchang Wang <junchangwang@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	romieu@...zoreil.com, nic_swsd@...ltek.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] r8169: Add 64bit statistics

On Thu, Nov 17, 2011 at 3:21 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le jeudi 17 novembre 2011 à 14:48 +0800, Junchang Wang a écrit :
>> Switch to use ndo_get_stats64 to get 64bit statistics.
>> Per cpu data is used to avoid lock operations.
>>
>>
>> Signed-off-by: Junchang Wang <junchangwang@...il.com>
>> ---
>>  drivers/net/ethernet/realtek/r8169.c |  113 ++++++++++++++++++++++++++++------
>>  1 files changed, 93 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
>> index cdf66d6..0165646 100644
>> --- a/drivers/net/ethernet/realtek/r8169.c
>> +++ b/drivers/net/ethernet/realtek/r8169.c
>> @@ -670,11 +670,31 @@ struct rtl8169_counters {
>>       __le16  tx_underun;
>>  };
>>
>> +struct rtl8169_pcpu_stats {
>> +     u64                     rx_packets;
>> +     u64                     rx_bytes;
>> +     u64                     tx_packets;
>> +     u64                     tx_bytes;
>> +     struct u64_stats_sync   syncp;
>> +     /*
>> +      * The following variables are updated
>> +      * without syncp protection.
>> +      */
>> +     unsigned long           rx_dropped;
>> +     unsigned long           tx_dropped;
>> +     unsigned long           rx_length_errors;
>> +     unsigned long           rx_errors;
>> +     unsigned long           rx_crc_errors;
>> +     unsigned long           rx_fifo_errors;
>> +     unsigned long           rx_missed_errors;
>> +};
>> +
>
> Thats overkill. Dont copy what have been done for virtual devices
> (loopback, tunnels, ...)
>
> RX and TX path are serialized (only one cpu can fly at one moment)
>
Thanks. I'll submit a new version.



-- 
--Junchang
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