[dpdk-dev] [PATCH] ring: fix unaligned memory access on aarch32

[Phil Yang]

The 32-bit arm machine doesn't support unaligned memory access. It
will cause a bus error on aarch32 with the custom element size ring.

Thread 1 "test" received signal SIGBUS, Bus error.
__rte_ring_enqueue_elems_64 (n=1, obj_table=0xf5edfe41, prod_head=0, \
r=0xf5edfb80) at /build/dpdk/build/include/rte_ring_elem.h:177
177                             ring[idx++] = obj[i++];

Fixes: cc4b218790f6 ("ring: support configurable element size")

Signed-off-by: Phil Yang <phil.y...@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com>
---
 lib/librte_ring/rte_ring_elem.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ring/rte_ring_elem.h b/lib/librte_ring/rte_ring_elem.h
index 3976757..663addc 100644
--- a/lib/librte_ring/rte_ring_elem.h
+++ b/lib/librte_ring/rte_ring_elem.h
@@ -160,7 +160,7 @@ __rte_ring_enqueue_elems_64(struct rte_ring *r, uint32_t 
prod_head,
        const uint32_t size = r->size;
        uint32_t idx = prod_head & r->mask;
        uint64_t *ring = (uint64_t *)&r[1];
-       const uint64_t *obj = (const uint64_t *)obj_table;
+       const unaligned_uint64_t *obj = (const unaligned_uint64_t *)obj_table;
        if (likely(idx + n < size)) {
                for (i = 0; i < (n & ~0x3); i += 4, idx += 4) {
                        ring[idx] = obj[i];
@@ -294,7 +294,7 @@ __rte_ring_dequeue_elems_64(struct rte_ring *r, uint32_t 
prod_head,
        const uint32_t size = r->size;
        uint32_t idx = prod_head & r->mask;
        uint64_t *ring = (uint64_t *)&r[1];
-       uint64_t *obj = (uint64_t *)obj_table;
+       unaligned_uint64_t *obj = (unaligned_uint64_t *)obj_table;
        if (likely(idx + n < size)) {
                for (i = 0; i < (n & ~0x3); i += 4, idx += 4) {
                        obj[i] = ring[idx];
-- 
2.7.4