netdev - Re: [PATCHv3 net-next-2.6] ethtool: Added support for FW dump

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Date:	Thu, 12 May 2011 11:53:25 -0700
From:	Anirban Chakraborty <anirban.chakraborty@...gic.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: Re: [PATCHv3 net-next-2.6] ethtool: Added support for FW dump


On May 12, 2011, at 10:04 AM, Ben Hutchings wrote:

> On Wed, 2011-05-11 at 15:54 -0700, Anirban Chakraborty wrote:
>> <snip>
>> +/**
>> + * struct ethtool_dump - used for retrieving, setting device dump
>> + * @cmd: Command number - %ETHTOOL_GET_DUMP_FLAG, %ETHTOOL_GET_DUMP_DATA, or
>> + * 	%ETHTOOL_SET_DUMP
>> + * @version: FW version of the dump, filled in by driver
>> + * @flag: driver dependent flag for dump setting, filled in by driver during
>> + * 	  get and filled in by ethtool for set operation
>> + * @len: length of dump data, returned by driver for get operation
> 
> This is also used as the length of the user buffer on entry to
> ETHTOOL_GET_DUMP_DATA.
Will add that.

> 
>> + * @data: data collected for get dump data operation
>> + */
>> +struct ethtool_dump {
>> +	__u32	cmd;
>> +	__u32	version;
>> +	__u32	flag;
>> +	__u32	len;
>> +	u8	data[0];
>> +};
>> +
>> /* for returning and changing feature sets */
>> 
>> /**
>> @@ -853,6 +871,9 @@ bool ethtool_invalid_flags(struct net_device *dev, u32 data, u32 supported);
>>  * @get_channels: Get number of channels.
>>  * @set_channels: Set number of channels.  Returns a negative error code or
>>  *	zero.
>> + * @get_dump_flag: Get dump flag indicating current dump settings of the device.
> 
> This operation must also provide the dump length.
Thats correct. WIll add that bit of info.

> 
>> <snip>
>> +	memset(&tmp, 0, sizeof(tmp));
>> +	tmp.cmd = dump.cmd;
> 
> tmp.cmd should be ETHTOOL_GET_DUMP_FLAG.
Agreed.

> 
>> +	ret = ops->get_dump_flag(dev, &tmp);
>> +	if (ret)
>> +		return ret;
>> +
>> +	len = (tmp.len > dump.len) ? dump.len : tmp.len;
>> +
>> +	data = vzalloc(len);
>> +	if (!data)
>> +		return -ENOMEM;
> [...]
> 
> The kernel buffer size must be tmp.len, otherwise the driver may overrun
> the buffer.
Agreed.

Thanks,
Anirban


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