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ethdev: replace full barrier with relaxed barrier

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While registering the call back functions full write barrier
can be replaced with one-way write barrier.

Signed-off-by: Phil Yang <phil.yang@arm.com>
Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
This commit is contained in:
Phil Yang 2020-10-13 11:25:36 -05:00 committed by Ferruh Yigit
parent 55509e3a49
commit 8dd4b2afc7
1 changed files with 6 additions and 3 deletions
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9
lib/librte_ethdev/rte_ethdev.c
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@ -26,7 +26,6 @@
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_common.h>
#include <rte_mempool.h>
@ -4651,8 +4650,12 @@ rte_eth_add_first_rx_callback(uint16_t port_id, uint16_t queue_id,
rte_spinlock_lock(&rte_eth_rx_cb_lock);
/* Add the callbacks at first position */
cb->next = rte_eth_devices[port_id].post_rx_burst_cbs[queue_id];
rte_smp_wmb();
rte_eth_devices[port_id].post_rx_burst_cbs[queue_id] = cb;
/* Stores to cb->fn, cb->param and cb->next should complete before
* cb is visible to data plane threads.
*/
__atomic_store_n(
&rte_eth_devices[port_id].post_rx_burst_cbs[queue_id],
cb, __ATOMIC_RELEASE);
rte_spinlock_unlock(&rte_eth_rx_cb_lock);
return cb;