[dpdk-dev] [PATCH v2 06/11] mempool/cnxk: add cn9k optimized mempool enqueue/dequeue

[Ashwin Sekhar T K]

Add Marvell CN9k mempool enqueue/dequeue. Marvell CN9k
supports burst dequeue which allows to dequeue up to 32
pointers using pipelined casp instructions.

Signed-off-by: Pavan Nikhilesh <pbhagavat...@marvell.com>
Signed-off-by: Ashwin Sekhar T K <asek...@marvell.com>
---
 doc/guides/mempool/cnxk.rst             |  4 +++
 drivers/mempool/cnxk/cn9k_mempool_ops.c | 39 +++++++++++++++++++++++--
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/doc/guides/mempool/cnxk.rst b/doc/guides/mempool/cnxk.rst
index 907c19c841..f51532b101 100644
--- a/doc/guides/mempool/cnxk.rst
+++ b/doc/guides/mempool/cnxk.rst
@@ -21,6 +21,10 @@ CNXK NPA PMD supports:
 - Ethdev Rx buffer allocation in HW to save CPU cycles in the Rx path.
 - Ethdev Tx buffer recycling in HW to save CPU cycles in the Tx path.
 
+CN9k NPA supports:
+
+- Burst alloc of up to 32 pointers.
+
 Prerequisites and Compilation procedure
 ---------------------------------------
 
diff --git a/drivers/mempool/cnxk/cn9k_mempool_ops.c 
b/drivers/mempool/cnxk/cn9k_mempool_ops.c
index f5ac163af9..c0cdba640b 100644
--- a/drivers/mempool/cnxk/cn9k_mempool_ops.c
+++ b/drivers/mempool/cnxk/cn9k_mempool_ops.c
@@ -7,6 +7,41 @@
 #include "roc_api.h"
 #include "cnxk_mempool.h"
 
+static int __rte_hot
+cn9k_mempool_enq(struct rte_mempool *mp, void *const *obj_table, unsigned int 
n)
+{
+       /* Ensure mbuf init changes are written before the free pointers
+        * are enqueued to the stack.
+        */
+       rte_io_wmb();
+       roc_npa_aura_op_bulk_free(mp->pool_id, (const uint64_t *)obj_table, n,
+                                 0);
+
+       return 0;
+}
+
+static inline int __rte_hot
+cn9k_mempool_deq(struct rte_mempool *mp, void **obj_table, unsigned int n)
+{
+       unsigned int count;
+
+       count = roc_npa_aura_op_bulk_alloc(mp->pool_id, (uint64_t *)obj_table,
+                                          n, 0, 1);
+
+       if (unlikely(count != n)) {
+               /* If bulk alloc failed to allocate all pointers, try
+                * allocating remaining pointers with the default alloc
+                * with retry scheme.
+                */
+               if (cnxk_mempool_deq(mp, &obj_table[count], n - count)) {
+                       cn9k_mempool_enq(mp, obj_table, count);
+                       return -ENOENT;
+               }
+       }
+
+       return 0;
+}
+
 static int
 cn9k_mempool_alloc(struct rte_mempool *mp)
 {
@@ -44,8 +79,8 @@ static struct rte_mempool_ops cn9k_mempool_ops = {
        .name = "cn9k_mempool_ops",
        .alloc = cn9k_mempool_alloc,
        .free = cnxk_mempool_free,
-       .enqueue = cnxk_mempool_enq,
-       .dequeue = cnxk_mempool_deq,
+       .enqueue = cn9k_mempool_enq,
+       .dequeue = cn9k_mempool_deq,
        .get_count = cnxk_mempool_get_count,
        .calc_mem_size = cnxk_mempool_calc_mem_size,
        .populate = cnxk_mempool_populate,
-- 
2.31.0