Some mempool hw like octeontx/fpa block, demands block size (/total_elem_sz) aligned object start address.
Introducing an MEMPOOL_F_POOL_BLK_SZ_ALIGNED flag. If this flag is set: - Align object start address to a multiple of total_elt_sz. - Allocate one additional object. Additional object is needed to make sure that requested 'n' object gets correctly populated. Example: - Let's say that we get 'x' size of memory chunk from memzone. - And application has requested 'n' object from mempool. - Ideally, we start using objects at start address 0 to...(x-block_sz) for n obj. - Not necessarily first object address i.e. 0 is aligned to block_sz. - So we derive 'offset' value for block_sz alignment purpose i.e..'off'. - That 'off' makes sure that start address of object is blk_sz aligned. - Calculating 'off' may end up sacrificing first block_sz area of memzone area x. So total number of the object which can fit in the pool area is n-1, Which is incorrect behavior. Therefore we request one additional object (/block_sz area) from memzone when F_BLK_SZ_ALIGNED flag is set. Signed-off-by: Santosh Shukla <santosh.shu...@caviumnetworks.com> Signed-off-by: Jerin Jacob <jerin.ja...@caviumnetworks.com> --- v1 -- v2: - patch description changed. - Removed elseif brakcet mix - removed sanity check for alignment - removed extra var delta - Removed __rte_unused from xmem_usage/size and added _BLK_SZ_ALIGN check. Refer v1 review comment [1]. [1] http://dpdk.org/dev/patchwork/patch/25605/ lib/librte_mempool/rte_mempool.c | 16 +++++++++++++--- lib/librte_mempool/rte_mempool.h | 1 + 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c index a6975aeda..4ae2bde53 100644 --- a/lib/librte_mempool/rte_mempool.c +++ b/lib/librte_mempool/rte_mempool.c @@ -239,10 +239,14 @@ rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags, */ size_t rte_mempool_xmem_size(uint32_t elt_num, size_t total_elt_sz, uint32_t pg_shift, - __rte_unused const struct rte_mempool *mp) + const struct rte_mempool *mp) { size_t obj_per_page, pg_num, pg_sz; + if (mp && mp->flags & MEMPOOL_F_POOL_BLK_SZ_ALIGNED) + /* alignment need one additional object */ + elt_num += 1; + if (total_elt_sz == 0) return 0; @@ -265,13 +269,16 @@ rte_mempool_xmem_size(uint32_t elt_num, size_t total_elt_sz, uint32_t pg_shift, ssize_t rte_mempool_xmem_usage(__rte_unused void *vaddr, uint32_t elt_num, size_t total_elt_sz, const phys_addr_t paddr[], uint32_t pg_num, - uint32_t pg_shift, __rte_unused const struct rte_mempool *mp) + uint32_t pg_shift, const struct rte_mempool *mp) { uint32_t elt_cnt = 0; phys_addr_t start, end; uint32_t paddr_idx; size_t pg_sz = (size_t)1 << pg_shift; + if (mp && mp->flags & MEMPOOL_F_POOL_BLK_SZ_ALIGNED) + /* alignment need one additional object */ + elt_num += 1; /* if paddr is NULL, assume contiguous memory */ if (paddr == NULL) { @@ -389,7 +396,10 @@ rte_mempool_populate_phys(struct rte_mempool *mp, char *vaddr, memhdr->free_cb = free_cb; memhdr->opaque = opaque; - if (mp->flags & MEMPOOL_F_NO_CACHE_ALIGN) + if (mp->flags & MEMPOOL_F_POOL_BLK_SZ_ALIGNED) + /* align object start address to a multiple of total_elt_sz */ + off = total_elt_sz - ((uintptr_t)vaddr % total_elt_sz); + else if (mp->flags & MEMPOOL_F_NO_CACHE_ALIGN) off = RTE_PTR_ALIGN_CEIL(vaddr, 8) - vaddr; else off = RTE_PTR_ALIGN_CEIL(vaddr, RTE_CACHE_LINE_SIZE) - vaddr; diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h index a4bfdb56e..d7c2416f4 100644 --- a/lib/librte_mempool/rte_mempool.h +++ b/lib/librte_mempool/rte_mempool.h @@ -266,6 +266,7 @@ struct rte_mempool { #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 */ +#define MEMPOOL_F_POOL_BLK_SZ_ALIGNED 0x0080 /**< Align obj start address to total elem size */ /** * @internal When debug is enabled, store some statistics. -- 2.13.0
