[PATCH v2 06/16] net/cnxk: use previous value atomic fetch operations

[Tyler Retzlaff]

Use __atomic_fetch_{add,and,or,sub,xor} instead of
__atomic_{add,and,or,sub,xor}_fetch adding the necessary code to
allow consumption of the resulting value.

Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
Acked-by:  Nithin Dabilpuram <ndabilpuram at marvell.com>
---
 drivers/net/cnxk/cn10k_tx.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/cnxk/cn10k_tx.h b/drivers/net/cnxk/cn10k_tx.h
index a72a803..c9ec01c 100644
--- a/drivers/net/cnxk/cn10k_tx.h
+++ b/drivers/net/cnxk/cn10k_tx.h
@@ -108,7 +108,7 @@
 retry:
 	while (__atomic_load_n(&txq->fc_cache_pkts, __ATOMIC_RELAXED) < 0)
 		;
-	cached = __atomic_sub_fetch(&txq->fc_cache_pkts, req, __ATOMIC_ACQUIRE);
+	cached = __atomic_fetch_sub(&txq->fc_cache_pkts, req, __ATOMIC_ACQUIRE) - req;
 	/* Check if there is enough space, else update and retry. */
 	if (cached < 0) {
 		/* Check if we have space else retry. */
@@ -302,7 +302,7 @@
 
 again:
 	fc_sw = txq->cpt_fc_sw;
-	val = __atomic_sub_fetch(fc_sw, nb_pkts, __ATOMIC_RELAXED);
+	val = __atomic_fetch_sub(fc_sw, nb_pkts, __ATOMIC_RELAXED) - nb_pkts;
 	if (likely(val >= 0))
 		return;
 
-- 
1.8.3.1