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From: Gage Eads <gage.eads@intel.com>
To: dev@dpdk.org
Cc: olivier.matz@6wind.com, arybchenko@solarflare.com,
bruce.richardson@intel.com, konstantin.ananyev@intel.com,
stephen@networkplumber.org, jerinj@marvell.com, mczekaj@marvell.com,
nd@arm.com, Ola.Liljedahl@arm.com, gage.eads@intel.com
Date: Mon, 18 Mar 2019 16:35:51 -0500
Message-Id: <20190318213555.17345-3-gage.eads@intel.com>
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<20190318213555.17345-1-gage.eads@intel.com>
Subject: [dpdk-dev] [PATCH v7 2/6] ring: add a ring start marker
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Message-ID: <20190318213551.BRK5oAGlrnMS9egp5WEHosW50SY7TV6hxEG5W9icyvs@z>
This marker allows us to replace "&r[1]" with "&r->ring" to locate the
start of the ring.
Signed-off-by: Gage Eads <gage.eads@intel.com>
---
lib/librte_ring/rte_ring.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/librte_ring/rte_ring.h b/lib/librte_ring/rte_ring.h
index c78db6916..f16d77b8a 100644
--- a/lib/librte_ring/rte_ring.h
+++ b/lib/librte_ring/rte_ring.h
@@ -118,6 +118,7 @@ struct rte_ring {
struct rte_ring_headtail_ptr cons_ptr __rte_cache_aligned;
};
char pad2 __rte_cache_aligned; /**< empty cache line */
+ void *ring[] __rte_cache_aligned; /**< empty marker for ring start */
};
#define RING_F_SP_ENQ 0x0001 /**< The default enqueue is "single-producer". */
@@ -361,7 +362,7 @@ __rte_ring_do_enqueue(struct rte_ring *r, void * const *obj_table,
if (n == 0)
goto end;
- ENQUEUE_PTRS(r, &r[1], prod_head, obj_table, n, void *);
+ ENQUEUE_PTRS(r, &r->ring, prod_head, obj_table, n, void *);
update_tail(&r->prod, prod_head, prod_next, is_sp, 1);
end:
@@ -403,7 +404,7 @@ __rte_ring_do_dequeue(struct rte_ring *r, void **obj_table,
if (n == 0)
goto end;
- DEQUEUE_PTRS(r, &r[1], cons_head, obj_table, n, void *);
+ DEQUEUE_PTRS(r, &r->ring, cons_head, obj_table, n, void *);
update_tail(&r->cons, cons_head, cons_next, is_sc, 0);
--
2.13.6