[dpdk-dev] [PATCH v4 5/7] mempool: detect physical contiguous object in pool

[santosh]

On Monday 04 September 2017 08:13 PM, Olivier MATZ wrote:
> On Tue, Aug 15, 2017 at 11:37:41AM +0530, Santosh Shukla wrote:
>> The memory area containing all the objects must be physically
>> contiguous.
>> Introducing MEMPOOL_F_CAPA_PHYS_CONTIG flag for such use-case.
>>
>> The flag useful to detect whether pool area has sufficient space
>> to fit all objects. If not then return -ENOSPC.
>> This way, we make sure that all object within a pool is contiguous.
>>
>> Signed-off-by: Santosh Shukla <santosh.shukla at caviumnetworks.com>
>> Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
>> ---
>>  lib/librte_mempool/rte_mempool.c | 8 ++++++++
>>  lib/librte_mempool/rte_mempool.h | 1 +
>>  2 files changed, 9 insertions(+)
>>
>> diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c
>> index d518c53de..19e5e6ddf 100644
>> --- a/lib/librte_mempool/rte_mempool.c
>> +++ b/lib/librte_mempool/rte_mempool.c
>> @@ -370,6 +370,14 @@ rte_mempool_populate_phys(struct rte_mempool *mp, char *vaddr,
>>  
>>  	total_elt_sz = mp->header_size + mp->elt_size + mp->trailer_size;
>>  
>> +	/* Detect pool area has sufficient space for elements */
>> +	if (mp->flags & MEMPOOL_F_CAPA_PHYS_CONTIG) {
>> +		if (len < total_elt_sz * mp->size) {
>> +			RTE_LOG(ERR, MEMPOOL, "pool area %" PRIx64 " not enough\n", (uint64_t)len);
>> +			return -ENOSPC;
>> +		}
>> +	}
>> +
>>  	memhdr = rte_zmalloc("MEMPOOL_MEMHDR", sizeof(*memhdr), 0);
>>  	if (memhdr == NULL)
>>  		return -ENOMEM;
>> diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
>> index bc4a1dac7..a4bfdb56e 100644
>> --- a/lib/librte_mempool/rte_mempool.h
>> +++ b/lib/librte_mempool/rte_mempool.h
>> @@ -265,6 +265,7 @@ struct rte_mempool {
>>  #define MEMPOOL_F_SC_GET         0x0008 /**< Default get is "single-consumer".*/
>>  #define MEMPOOL_F_POOL_CREATED   0x0010 /**< Internal: pool is created. */
>>  #define MEMPOOL_F_NO_PHYS_CONTIG 0x0020 /**< Don't need physically contiguous objs. */
>> +#define MEMPOOL_F_CAPA_PHYS_CONTIG 0x0040 /**< Detect physcially contiguous objs */
>>  
> The description should be longer. It is impossible to understand what is the
> meaning of this capability flag by just reading the comment.
>
> Example:
> /**
>  * This capability flag is advertised by a mempool handler if the whole
>  * memory area containing the objects must be physically contiguous.
>  */

in v5, Thanks.