From: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
To: dev@dpdk.org, honnappa.nagarahalli@arm.com, phil.yang@arm.com,
jgrajcia@cisco.com, ferruh.yigit@intel.com
Cc: nd@arm.com, stable@dpdk.org
Subject: [dpdk-dev] [PATCH 4/4] net/memif: relax the load of ring head pointer for M2S ring
Date: Mon, 21 Sep 2020 14:22:54 -0500 [thread overview]
Message-ID: <20200921192254.20560-4-honnappa.nagarahalli@arm.com> (raw)
In-Reply-To: <20200921192254.20560-1-honnappa.nagarahalli@arm.com>
For M2S rings, ring->head is updated by the receiver and eth_memif_rx
function is called in the context of receiving thread. The loads in
the sender do not need to synchronize with its own stores.
Fixes: a2aafb9aa651 ("net/memif: optimize with one-way barrier")
Cc: phil.yang@arm.com
Cc: stable@dpdk.org
Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
---
drivers/net/memif/rte_eth_memif.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/memif/rte_eth_memif.c b/drivers/net/memif/rte_eth_memif.c
index 435c6345c..1cbb1fd7a 100644
--- a/drivers/net/memif/rte_eth_memif.c
+++ b/drivers/net/memif/rte_eth_memif.c
@@ -405,7 +405,11 @@ eth_memif_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
refill:
if (type == MEMIF_RING_M2S) {
- head = __atomic_load_n(&ring->head, __ATOMIC_ACQUIRE);
+ /* ring->head is updated by the receiver and this function
+ * is called in the context of receiver thread. The loads in
+ * the receiver do not need to synchronize with its own stores.
+ */
+ head = __atomic_load_n(&ring->head, __ATOMIC_RELAXED);
n_slots = ring_size - head + mq->last_tail;
while (n_slots--) {
--
2.17.1
next prev parent reply other threads:[~2020-09-21 19:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-21 19:22 [dpdk-dev] [PATCH 1/4] net/memif: do not update local copy of tail in tx function Honnappa Nagarahalli
2020-09-21 19:22 ` [dpdk-dev] [PATCH 2/4] net/memif: relax the load of ring tail pointer for M2S ring Honnappa Nagarahalli
2020-09-21 19:22 ` [dpdk-dev] [PATCH 3/4] net/memif: relax the load of ring head pointer for S2M ring Honnappa Nagarahalli
2020-09-21 19:22 ` Honnappa Nagarahalli [this message]
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 1/8] net/memif: do not update local copy of tail in tx function Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 2/8] net/memif: relax the load of ring tail pointer for M2S ring Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 3/8] net/memif: relax the load of ring head " Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 4/8] net/memif: relax the load of ring head pointer for S2M ring Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 5/8] net/memif: relax the load of ring head pointer for M2S zc ring Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 6/8] net/memif: remove extra check Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 7/8] net/memif: relax the load of ring head pointer for S2M zc ring Honnappa Nagarahalli
2020-09-28 19:03 ` [dpdk-dev] [PATCH v2 8/8] net/memif: move the barrier outside the loop Honnappa Nagarahalli
2020-09-28 20:53 ` [dpdk-dev] [PATCH v2 1/8] net/memif: do not update local copy of tail in tx function Stephen Hemminger
2020-09-29 5:24 ` Honnappa Nagarahalli
2020-10-07 17:08 ` Honnappa Nagarahalli
2020-10-09 11:23 ` Jakub Grajciar -X (jgrajcia - PANTHEON TECH SRO at Cisco)
2020-10-09 15:59 ` Ferruh Yigit
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