Re: [dpdk-dev] [PATCH 3/4] ethdev: count devices consistently

["Gaëtan Rivet" <gaetan.rivet@6wind.com>]

On Thu, Mar 30, 2017 at 09:26:12PM +0200, Thomas Monjalon wrote:
>2017-03-03 16:40, Gaetan Rivet:
>> Make the rte_eth_dev_count() return the correct number of devices even
>> after some are detached by the hotplug API.
>
>Please explain what is the correct number,
>or that the wrong number was a max id.
>

will do.

>> This change does not affect existing applications that do not use
>> hotplug API calls. Those that do are already aware that port IDs are not
>> necessarily contiguous.
>[...]
>> --- a/lib/librte_ether/rte_ethdev.h
>> +++ b/lib/librte_ether/rte_ethdev.h
>> -#define RTE_ETH_FOREACH_DEV(p)			\
>> -	for (p = rte_eth_find_next(0);		\
>> -	     p < RTE_MAX_ETHPORTS;		\
>> +#define RTE_ETH_FOREACH_DEV(p)					\
>> +	for (p = rte_eth_find_next(0);				\
>> +	     (unsigned int)p < (unsigned int)RTE_MAX_ETHPORTS;	\
>>  	     p = rte_eth_find_next(p + 1))
>
>This macro was introduced in previous patch.
>Why adding the cast here?

In the function rte_eth_dev_get_port_by_name(), the iterator is an int.
When I introduced the use of the iterator there, I then realized that it 
would be better to allow users to use signed ints as well, to avoid 
unnecessary edits on their part.

In retrospective, I agree that it would have been better in the previous 
patch.

-- 
Gaëtan Rivet
6WIND