Re: [dpdk-dev] [PATCH v4 09/18] net/qede: strncpy length constant and NUL

[Andy Green <andy@warmcat.com>]

On 05/11/2018 06:43 PM, De Lara Guarch, Pablo wrote:
> 
> 
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Andy Green
>> Sent: Friday, May 11, 2018 2:46 AM
>> To: dev@dpdk.org
>> Subject: [dpdk-dev] [PATCH v4 09/18] net/qede: strncpy length constant and
>> NUL
>>
>> Signed-off-by: Andy Green <andy@warmcat.com>
>> ---
>>   drivers/net/qede/base/ecore_int.c |    8 +++++---
>>   1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/qede/base/ecore_int.c
>> b/drivers/net/qede/base/ecore_int.c
>> index f43781ba4..d9e22b5ed 100644
>> --- a/drivers/net/qede/base/ecore_int.c
>> +++ b/drivers/net/qede/base/ecore_int.c
>> @@ -6,6 +6,8 @@
>>    * See LICENSE.qede_pmd for copyright and licensing details.
>>    */
>>
>> +#include <rte_string_fns.h>
>> +
>>   #include "bcm_osal.h"
>>   #include "ecore.h"
>>   #include "ecore_spq.h"
>> @@ -1104,9 +1106,9 @@ static enum _ecore_status_t
>> ecore_int_deassertion(struct ecore_hwfn *p_hwfn,
>>   							      p_aeu->bit_name,
>>   							      num);
>>   					else
>> -						OSAL_STRNCPY(bit_name,
>> -							     p_aeu->bit_name,
>> -							     30);
>> +						strlcpy(bit_name,
>> +							p_aeu->bit_name,
>> +							sizeof(bit_name));
>>
>>   					/* We now need to pass bitmask in its
>>   					 * correct position.
> 
> I'd say it should be better to change OSAL_STRNCPY to OSAL_STRLCPY and
> modify the macro to use strlcpy, so we avoid further uses of that strlcpy.
> 
> However, this modifies base driver code, so it is up to the maintainers to make that decision.
> (CC'ing maintainers here).

There's no value for any OSAL_* that simply defines itself to be the 
same as the direct api, as does OSAL_STRNCPY.

It's better to just remove any OSAL_* that calls straight through since 
all it does is obfuscate what the code does, for no benefit.

> Also, missing fixes line and CC stable.
> 
> Fixes: 8427c6647964 ("net/qede/base: add attention formatting string")

The idea of this "Fixes" thing is to look up in git blame what is being 
edited is it?  If so what's the benefit of that over using git if you 
ever want to know that?

-Andy

> Cc: stable@dpdk.org
>