Re: [dpdk-dev] [PATCH v4 2/5] lib/mbuf: introduce helper to create mempool with flags

[Maxime Coquelin <maxime.coquelin@redhat.com>]

On 3/22/19 2:01 PM, Xiaolong Ye wrote:
> This allows applications to create mbuf mempool with specific flags
> such as MEMPOOL_F_NO_SPREAD if they want fixed size memory objects.
> 
> Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
> ---
>   lib/librte_mbuf/rte_mbuf.c | 29 +++++++++++++++++++-----
>   lib/librte_mbuf/rte_mbuf.h | 45 ++++++++++++++++++++++++++++++++++++++
>   2 files changed, 69 insertions(+), 5 deletions(-)
> 

> +/**
> + * Create a mbuf pool with flags.
> + *
> + * This function creates and initializes a packet mbuf pool. It is
> + * a wrapper to rte_mempool functions.
> + *
> + * @warning
> + * @b EXPERIMENTAL: This API may change without prior notice.
> + *
> + * @param name
> + *   The name of the mbuf pool.
> + * @param n
> + *   The number of elements in the mbuf pool. The optimum size (in terms
> + *   of memory usage) for a mempool is when n is a power of two minus one:
> + *   n = (2^q - 1).
> + * @param cache_size
> + *   Size of the per-core object cache. See rte_mempool_create() for
> + *   details.
> + * @param priv_size
> + *   Size of application private are between the rte_mbuf structure
> + *   and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
> + * @param data_room_size
> + *   Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
> + * @param flags
> + *   Flags controlling the behavior of the mempool. See
> + *   rte_mempool_create() for details.
> + * @param socket_id
> + *   The socket identifier where the memory should be allocated. The
> + *   value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
> + *   reserved zone.
> + * @return
> + *   The pointer to the new allocated mempool, on success. NULL on error
> + *   with rte_errno set appropriately. Possible rte_errno values include:
> + *    - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
> + *    - E_RTE_SECONDARY - function was called from a secondary process instance
> + *    - EINVAL - cache size provided is too large, or priv_size is not aligned.
> + *    - ENOSPC - the maximum number of memzones has already been allocated
> + *    - EEXIST - a memzone with the same name already exists
> + *    - ENOMEM - no appropriate memory area found in which to create memzone
> + */
> +struct rte_mempool * __rte_experimental
> +rte_pktmbuf_pool_create_with_flags(const char *name, unsigned int n,
> +	unsigned int cache_size, uint16_t priv_size, uint16_t data_room_size,
> +	unsigned int flags, int socket_id);
> +
>   /**
>    * Create a mbuf pool with a given mempool ops name
>    *
> 

You need to add it to rte_mbuf_version.map too.